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JP2007239848A - Bearing for wheel with sensor - Google Patents

Bearing for wheel with sensor Download PDF

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Publication number
JP2007239848A
JP2007239848A JP2006062251A JP2006062251A JP2007239848A JP 2007239848 A JP2007239848 A JP 2007239848A JP 2006062251 A JP2006062251 A JP 2006062251A JP 2006062251 A JP2006062251 A JP 2006062251A JP 2007239848 A JP2007239848 A JP 2007239848A
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Prior art keywords
sensor
strain
wheel bearing
mounting member
sensor mounting
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JP2006062251A
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JP4889324B2 (en
Inventor
Takami Ozaki
孝美 尾崎
Tomoumi Ishikawa
智海 石河
Kentaro Nishikawa
健太郎 西川
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2006062251A priority Critical patent/JP4889324B2/en
Priority to EP07713566.3A priority patent/EP2006653B1/en
Priority to US12/224,802 priority patent/US7762128B2/en
Priority to PCT/JP2007/000184 priority patent/WO2007105367A1/en
Publication of JP2007239848A publication Critical patent/JP2007239848A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0009Force sensors associated with a bearing
    • G01L5/0019Force sensors associated with a bearing by using strain gages, piezoelectric, piezo-resistive or other ohmic-resistance based sensors

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing for a wheel with sensors enabling compact installation of the sensors for load detection in a vehicle, capable of sensitively detecting a load applied to the wheel, and manufacturable at low cost in mass-production. <P>SOLUTION: This bearing for the wheel in which double rows of rolling elements 3 are interposed between an outer member 1 and an inner member 2 comprises a sensor unit 21 on a fixed side member of one of an outer member 1 and an inner member 2. For example, the fixed side member is assumed to be the outer member 1. The sensor unit 21 comprises at least one of a sensor mounting member 22 and at least one strain sensor 23 mounted on the sensor mounting member 22. The sensor mounting member 22 includes a plurality of contact fixing members 22a and 22b fixed to each of at least two locations separated from each other in the circumferential direction on the outer member 1. At least one cut 24 extending in the axial direction is provided at a position corresponding to a section between the contact fixing portions 22a and 22b adjacent to each other on the sensor mounting member 22. The strain sensor 23 is disposed at least in one location between the adjacent contact fixing portions 22a and 22b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、車輪の軸受部にかかる荷重を検出する荷重センサを内蔵したセンサ付車輪用軸受に関する。   The present invention relates to a sensor-equipped wheel bearing with a built-in load sensor for detecting a load applied to a bearing portion of the wheel.

従来、自動車の安全走行のために、各車輪の回転速度を検出するセンサを車輪用軸受に設けたものがある。従来の一般的な自動車の走行安全性確保対策は、各部の車輪の回転速度を検出することで行われているが、車輪の回転速度だけでは十分でなく、その他のセンサ信号を用いてさらに安全面の制御が可能なことが求められている。   2. Description of the Related Art Conventionally, there is a wheel bearing provided with a sensor for detecting the rotational speed of each wheel for safe driving of an automobile. Conventional measures to ensure driving safety of general automobiles are carried out by detecting the rotational speed of the wheels of each part, but the rotational speed of the wheels is not sufficient, and it is further safer by using other sensor signals. It is required that the surface can be controlled.

そこで、車両走行時に各車輪に作用する荷重から姿勢制御を図ることも考えられる。例えばコーナリングにおいては外側車輪に大きな荷重がかかり、また左右傾斜面走行では片側車輪に、ブレーキングにおいては前輪にそれぞれ荷重が片寄るなど、各車輪にかかる荷重は均等ではない。また、積載荷重不均等の場合にも各車輪にかかる荷重は不均等になる。このため、車輪にかかる荷重を随時検出できれば、その検出結果に基づき、事前にサスペンション等を制御することで、車両走行時の姿勢制御(コーナリング時のローリング防止、ブレーキング時の前輪沈み込み防止、積載荷重不均等による沈み込み防止等)を行うことが可能となる。しかし、車輪に作用する荷重を検出するセンサの適切な設置場所がなく、荷重検出による姿勢制御の実現が難しい。   Therefore, it is conceivable to control the attitude from the load acting on each wheel during vehicle travel. For example, a large load is applied to the outer wheel in cornering, and the load applied to each wheel is not uniform. Further, even when the load is uneven, the load applied to each wheel becomes uneven. For this reason, if the load applied to the wheel can be detected at any time, based on the detection result, the suspension and the like are controlled in advance, thereby controlling the posture during vehicle travel (preventing rolling during cornering, preventing the front wheel from sinking during braking, It is possible to prevent subsidence due to uneven load capacity. However, there is no appropriate installation location of a sensor that detects a load acting on the wheel, and it is difficult to realize posture control by load detection.

また、今後ステアバイワイヤが導入されて、車軸とステアリングが機械的に結合しないシステムになってくると、車軸方向荷重を検出して運転手が握るハンドルに路面情報を伝達することが求められる。   In addition, when steer-by-wire is introduced in the future, and the system is such that the axle and the steering are not mechanically coupled, it is required to detect the axle direction load and transmit the road surface information to the handle held by the driver.

このような要請に応えるものとして、車輪用軸受の外輪に歪みゲージを貼り付け、歪みを検出するようにした車輪用軸受が提案されている(例えば特許文献1)。
特表2003−530565号公報
As a response to such a demand, a wheel bearing has been proposed in which a strain gauge is attached to the outer ring of the wheel bearing to detect the strain (for example, Patent Document 1).
Special table 2003-530565 gazette

車輪用軸受の外輪は、転走面を有し、強度が求められる部品であって、塑性加工や、旋削加工、熱処理、研削加工などの複雑な工程を経て生産される軸受部品であるため、特許文献1のように外輪に歪みゲージを貼り付けるのでは、生産性が悪く、量産時のコストが高くなるという問題点がある。また、外輪の歪みを感度良く検出することが難しく、その検出結果を車両走行時の姿勢制御に利用した場合、制御の精度が問題となる。   The outer ring of the wheel bearing is a part that has a rolling surface and requires strength, and is a bearing part that is produced through complicated processes such as plastic working, turning, heat treatment, and grinding. When a strain gauge is attached to the outer ring as in Patent Document 1, there is a problem that productivity is poor and the cost for mass production is high. In addition, it is difficult to detect the distortion of the outer ring with high sensitivity, and when the detection result is used for attitude control during vehicle travel, the accuracy of control becomes a problem.

この発明の目的は、車両にコンパクトに荷重検出用のセンサを設置できて、車輪にかかる荷重を感度良く検出でき、量産時のコストが安価となるセンサ付車輪用軸受を提供することである。   An object of the present invention is to provide a sensor-equipped wheel bearing in which a load detection sensor can be compactly installed in a vehicle, the load applied to the wheel can be detected with high sensitivity, and the cost during mass production is low.

この発明のセンサ付車輪用軸受は、複列の転走面が内周に形成された外方部材と、この外方部材の転走面と対向する転走面を形成した内方部材と、両転走面間に介在した複列の転動体とを備え、車体に対して車輪を回転自在に支持する車輪用軸受において、センサ取付部材およびこのセンサ取付部材に取付けられた歪みセンサからなるセンサユニットを、前記外方部材および内方部材のうちの固定側部材に取付け、前記センサ取付部材は、前記固定側部材の円周方向に離れた少なくとも2箇所にそれぞれ固定される複数の接触固定部を有し、このセンサ取付部材の互いに隣接する接触固定部間に対応する位置で、前記固定側部材に軸方向に延びる少なくとも1箇所の切欠きを設け、前記歪みセンサは隣接する前記接触固定部間で少なくとも1箇所に配したことを特徴とする。前記切欠きは、車軸用軸受としての要求される剛性を保つ範囲内で、固定側部材の剛性を低下させるものとする。   The sensor-equipped wheel bearing according to the present invention includes an outer member having a double row rolling surface formed on the inner periphery, an inner member having a rolling surface facing the rolling surface of the outer member, A wheel bearing comprising a double row rolling element interposed between both rolling surfaces and rotatably supporting the wheel with respect to the vehicle body, a sensor comprising a sensor mounting member and a strain sensor mounted on the sensor mounting member A unit is attached to a fixed-side member of the outer member and the inner member, and the sensor mounting member is fixed to at least two locations separated from each other in the circumferential direction of the fixed-side member. At least one notch extending in the axial direction on the stationary side member at a position corresponding to between adjacent contact fixing portions of the sensor mounting member, and the strain sensor is adjacent to the contact fixing portion. At least 1 in between Characterized in that arranged in place. The notch reduces the rigidity of the stationary member within a range that maintains the required rigidity as an axle bearing.

車両走行に伴い回転側部材に荷重が加わると、転動体を介して固定側部材が変形し、その変形はセンサユニットに歪みをもたらす。センサユニットに設けられた歪みセンサは、センサユニットの歪みを検出する。歪みと荷重の関係を予め実験やシミュレーションで求めておけば、歪みセンサの出力から車輪にかかる荷重を検出することができる。また、この検出した荷重を自動車の車両制御に使用することが出来る。
この車輪用軸受は、センサ取付部材およびこのセンサ取付部材に取付けた歪みセンサからなるセンサユニットを固定側部材に取付ける構成としたため、荷重検出用のセンサを車両にコンパクトに設置できる。センサ取付部材は固定側部材に取付けられる簡易な部品であるため、これに歪みセンサを取付けることで、量産性に優れたものとでき、コスト低下が図れる。
また、センサ取付部材は、固定側部材の円周方向に離れた少なくとも2箇所にそれぞれ固定される複数の接触固定部を有し、このセンサ取付部材の互いに隣接する接触固定部間に対応する位置で、固定側部材に軸方向に延びる少なくとも1箇所の切欠きが設けられているため、固定側部材における切欠きの円周方向両側部分の剛性が低下し、この部分は他の部分よりも歪みが大きくなり、その大きな歪みがセンサ取付部材に伝わる。また、センサ取付部材は固定側部材に比べて薄肉な部材であるため歪みが集中し、固定側部材よりも大きな歪みが得られる。これらのことから、センサ取付部材における隣接する接触固定部間で少なくとも1箇所に配した歪みセンサで歪みを測定することにより、固定側部材の歪みを感度良く検出することができる。
When a load is applied to the rotation side member as the vehicle travels, the fixed side member is deformed via the rolling elements, and the deformation causes distortion of the sensor unit. The strain sensor provided in the sensor unit detects the strain of the sensor unit. If the relationship between strain and load is obtained in advance through experiments and simulations, the load applied to the wheel can be detected from the output of the strain sensor. Moreover, this detected load can be used for vehicle control of an automobile.
Since the wheel bearing has a configuration in which the sensor mounting unit and the sensor unit including the strain sensor mounted on the sensor mounting member are mounted on the fixed side member, the load detection sensor can be compactly installed on the vehicle. Since the sensor mounting member is a simple part that can be mounted on the fixed side member, by attaching a strain sensor to the sensor mounting member, the sensor mounting member can be excellent in mass productivity, and the cost can be reduced.
The sensor mounting member has a plurality of contact fixing portions that are respectively fixed to at least two locations separated in the circumferential direction of the fixed side member, and positions corresponding to adjacent contact fixing portions of the sensor mounting member. Thus, since the fixed side member is provided with at least one notch extending in the axial direction, the rigidity of both sides in the circumferential direction of the notch in the fixed side member is lowered, and this portion is distorted more than the other portions. And the large distortion is transmitted to the sensor mounting member. Further, since the sensor mounting member is a thinner member than the fixed side member, the strain is concentrated, and a larger strain than that of the fixed side member is obtained. From these facts, the strain of the fixed member can be detected with high sensitivity by measuring the strain with a strain sensor disposed at least at one position between the adjacent contact fixing portions of the sensor mounting member.

前記接触固定部の少なくとも1箇所が、前記固定側部材に作用する外力、またはタイヤと路面間の作用力によって、固定側部材の円周方向における他の箇所と比べてラジアル方向に大きく変形する円周方向箇所に取付けられているのが良い。
固定側部材は、円周方向の各部によって、上記外力や作用力によるラジアル方向の変形の程度が異なる。解析結果によると、タイヤと路面との接触点に作用する軸方向力による固定側部材のラジアル方向の変形は、反路面側である真上位置および路面側である真下位置で最も大きくなる。第1の接触固定部が、上記のような固定側部材における他の箇所と比べてラジアル方向に大きく変形する箇所に取付けられていると、センサ取付部材は、変形の少ない第2の接触固定部が支点となって、第1の接触固定部が固定側部材の大きな変形に伴い大きく変形する。そのため、センサ取付部材の歪みセンサの取付部分がより一層大きな歪みを生じることになり、歪みセンサにより、固定側部材の歪みをさらに感度良く検出することができる。
A circle in which at least one portion of the contact fixing portion is largely deformed in the radial direction as compared with other portions in the circumferential direction of the stationary member due to an external force acting on the stationary member or an acting force between the tire and the road surface. It is good that it is attached in the circumferential direction.
The degree of deformation in the radial direction due to the external force and acting force varies depending on each part in the circumferential direction of the fixed side member. According to the analysis result, the radial deformation of the fixed side member due to the axial force acting on the contact point between the tire and the road surface is greatest at the position directly above the road surface side and the position directly below the road surface side. When the first contact fixing portion is attached to a location that is greatly deformed in the radial direction as compared to other locations on the fixed side member as described above, the sensor attachment member is a second contact fixing portion that is less deformed. Serves as a fulcrum, and the first contact fixing portion is greatly deformed with a large deformation of the stationary member. For this reason, the strain sensor mounting portion of the sensor mounting member generates a larger strain, and the strain sensor can detect the strain of the fixed side member with higher sensitivity.

前記センサユニットは、固定側部材におけるアウトボード側部分、例えば固定側部材におけるアウトボード側の転走面よりもアウトボード側の位置に取付けるのが好ましい。
解析および試験結果によると、固定側部材のラジアル方向歪みおよび周方向歪みとも、前記外力あるいは作用力等の荷重の正負によって歪みに正負の方向性を持つのは、固定側部材におけるアウトボード側の部分のみであった。したがって、荷重の正負の方向を検出するには、センサユニットを固定側部材におけるアウトボード側の位置に配置することが必要である。
The sensor unit is preferably attached to a position on the outboard side of the outboard side portion of the fixed side member, for example, the rolling surface on the outboard side of the fixed side member.
According to the analysis and test results, both the radial strain and the circumferential strain of the fixed side member have a positive / negative directionality to the strain due to the positive / negative of the load such as the external force or the acting force on the outboard side of the fixed side member. Only part. Therefore, in order to detect the positive / negative direction of the load, it is necessary to arrange the sensor unit at a position on the outboard side of the stationary member.

また、前記センサユニットは前記固定側部材の周面に設けるのが好ましい。
センサユニットは、固定側部材の周面および端面のいずれに取付けても良いが、周面に取付けた場合、センサ取付部材に固定側部材の変形が伝わり易く、固定側部材の歪みをより感度良く検出することができる。
The sensor unit is preferably provided on the peripheral surface of the stationary member.
The sensor unit may be attached to either the peripheral surface or the end surface of the fixed side member. However, when the sensor unit is attached to the peripheral surface, the deformation of the fixed side member is easily transmitted to the sensor mounting member, and the distortion of the fixed side member is more sensitive. Can be detected.

前記センサユニットは複数とすることができる。
複数のセンサユニットを固定側部材の複数箇所に設けると、固定側部材の各部の歪みを検出することができ、固定側部材の歪みに関するより詳細な情報が得られる。
The sensor unit may be plural.
When a plurality of sensor units are provided at a plurality of locations on the fixed side member, distortion of each part of the fixed side member can be detected, and more detailed information on the distortion of the fixed side member can be obtained.

前記歪みセンサの出力によって、車輪用軸受に作用する外力、またはタイヤと路面間の作用力、または車輪用軸受の予圧量を推定する推定手段を設けると良い。
推定手段によって得られる車輪用軸受に作用する外力、またはタイヤと路面間の作用力、または車輪用軸受の予圧量を自動車の車両制御に使用することにより、きめ細かな車両制御が可能となる。
It is preferable to provide estimation means for estimating an external force acting on the wheel bearing, an acting force between the tire and the road surface, or a preload amount of the wheel bearing depending on the output of the strain sensor.
By using the external force acting on the wheel bearing obtained by the estimating means, the acting force between the tire and the road surface, or the preload amount of the wheel bearing for vehicle control of the automobile, fine vehicle control is possible.

前記固定側部材に作用する外力、または前記タイヤと路面間に作用する作用力として、想定される最大の力が印加された状態においても、前記センサユニットのセンサ取付部材が塑性変形しないものとするのが良い。上記の想定される最大の力は、車両故障につながらない走行において想定される最大の力である。
センサユニットに塑性変形が生じると、固定側部材の変形がセンサユニットのセンサ取付部材に正確に伝わらず、歪みの測定に影響を及ぼす。センサユニットを上記のようにすると、これを回避することができる。
It is assumed that the sensor mounting member of the sensor unit is not plastically deformed even in a state in which the maximum force assumed as an external force acting on the stationary member or an acting force acting between the tire and the road surface is applied. Is good. The above assumed maximum force is the maximum force assumed in traveling that does not lead to vehicle failure.
When plastic deformation occurs in the sensor unit, the deformation of the fixed side member is not accurately transmitted to the sensor mounting member of the sensor unit and affects the measurement of strain. When the sensor unit is configured as described above, this can be avoided.

前記センサ取付部材はプレス加工品とすることができる。
センサ取付部材をプレス加工により製作すると、加工が容易であり、コストダウンが可能になる。
The sensor mounting member may be a press-processed product.
If the sensor mounting member is manufactured by press working, the processing is easy and the cost can be reduced.

前記センサ取付部材は金属粉末射出成形による焼結金属としても良い。
センサ取付部材を金属粉末射出成形により製作すると、寸法精度の良いセンサ取付部材が得られる。
The sensor mounting member may be a sintered metal by metal powder injection molding.
When the sensor mounting member is manufactured by metal powder injection molding, a sensor mounting member with good dimensional accuracy can be obtained.

前記センサ取付部材と前記固定側部材との固定は、ボルトおよび接着剤のいずれかを用いて行なうか、または両方を併用して行なうか、または溶接を用いて行なうことができる。
上記いずれかの方法でセンサ取付部材と固定側部材とを固定すると、センサ取付部材を固定側部材に強固に固定することができる。そのため、センサ取付部材が固定側部材に対して位置ずれすることがなく、固定側部材の変形をセンサ取付部材に正確に伝えることが可能になる。
The sensor mounting member and the fixed side member can be fixed using either a bolt or an adhesive, or a combination of both, or welding.
When the sensor attachment member and the fixed side member are fixed by any one of the above methods, the sensor attachment member can be firmly fixed to the fixed side member. Therefore, the sensor mounting member is not displaced with respect to the fixed side member, and the deformation of the fixed side member can be accurately transmitted to the sensor mounting member.

前記センサ取付部材に温度センサを設けても良い。
車輪用軸受は使用中に温度が変化するため、その温度変化がセンサ取付部材の歪み、または歪みセンサの動作に影響を及ぼす。また、周囲の環境温度の変化に対しても同様の影響を及ぼす。温度センサの出力により歪みセンサの温度特性を補正することで、精度の高い荷重検出を行なうことが可能となる。
A temperature sensor may be provided on the sensor mounting member.
Since the temperature of the wheel bearing changes during use, the temperature change affects the strain of the sensor mounting member or the operation of the strain sensor. It also has the same effect on changes in ambient environmental temperature. By correcting the temperature characteristics of the strain sensor based on the output of the temperature sensor, it is possible to detect a load with high accuracy.

前記センサ取付部材に加速度センサおよび振動センサのうち少なくとも一つを設けても良い。
センサ取付部材に、歪みセンサの他に加速度センサ、振動センサ等の各種センサを取付けると、荷重と車輪用軸受の状態を1箇所で測定することができ、配線等を簡略なものとすることができる。
The sensor mounting member may be provided with at least one of an acceleration sensor and a vibration sensor.
When various sensors such as an acceleration sensor and a vibration sensor are mounted on the sensor mounting member in addition to the strain sensor, the load and the state of the wheel bearing can be measured at one place, and wiring and the like can be simplified. it can.

前記歪みセンサは、前記センサ取付部材の表面に絶縁層を印刷および焼成によって形成し、前記絶縁層の上に電極および歪み測定用抵抗体を印刷および焼成によって形成したものとしても良い。
上記のように歪みセンサを形成すると、歪みセンサをセンサ取付部材に対して接着により固定する場合のように、経年変化による接着強度の低下がないため、センサユニットの信頼性を向上させることができる。また、加工が容易であるため、コストダウンを図れる。
In the strain sensor, an insulating layer may be formed on the surface of the sensor mounting member by printing and baking, and an electrode and a strain measurement resistor may be formed on the insulating layer by printing and baking.
When the strain sensor is formed as described above, the adhesion strength due to secular change does not decrease as in the case where the strain sensor is fixed to the sensor mounting member by adhesion, so that the reliability of the sensor unit can be improved. . Moreover, since processing is easy, cost reduction can be achieved.

前記センサユニットの近傍に、前記歪みセンサの出力信号を処理するセンサ信号処理回路を有するセンサ信号処理回路ユニットを設けても良い。
センサユニットの近傍にセンサ信号処理回路ユニットを設けると、センサユニットからセンサ信号処理回路ユニットへの配線の手間が簡略化できる。また、車輪用軸受以外の場所にセンサ信号処理回路ユニットを設ける場合よりも、センサ信号処理回路ユニットをコンパクトに設置できる。
A sensor signal processing circuit unit having a sensor signal processing circuit for processing the output signal of the strain sensor may be provided in the vicinity of the sensor unit.
Providing a sensor signal processing circuit unit in the vicinity of the sensor unit can simplify the wiring work from the sensor unit to the sensor signal processing circuit unit. Further, the sensor signal processing circuit unit can be installed more compactly than when the sensor signal processing circuit unit is provided in a place other than the wheel bearing.

この発明のセンサ付車輪用軸受は、複列の転走面が内周に形成された外方部材と、この外方部材の転走面と対向する転走面を形成した内方部材と、両転走面間に介在した複列の転動体とを備え、車体に対して車輪を回転自在に支持する車輪用軸受において、センサ取付部材およびこのセンサ取付部材に取付けられた歪みセンサからなるセンサユニットを、前記外方部材および内方部材のうちの固定側部材に取付け、前記センサ取付部材は、前記固定側部材の円周方向に離れた少なくとも2箇所にそれぞれ固定される複数の接触固定部を有し、このセンサ取付部材の互いに隣接する接触固定部間に対応する位置で、前記固定側部材に軸方向に延びる少なくとも1箇所の切欠きを設け、前記歪みセンサは隣接する前記接触固定部間で少なくとも1箇所に配したため、車両にコンパクトに荷重検出用のセンサを設置でき、かつ車輪にかかる荷重を感度良く検出できる。センサ取付部材は固定側部材に取付けられる簡易な部品であるため、これに歪みセンサを取付けることで、量産性に優れたものとでき、コスト低下が図れる。   The sensor-equipped wheel bearing according to the present invention includes an outer member having a double row rolling surface formed on the inner periphery, an inner member having a rolling surface facing the rolling surface of the outer member, A wheel bearing comprising a double row rolling element interposed between both rolling surfaces and rotatably supporting the wheel with respect to the vehicle body, a sensor comprising a sensor mounting member and a strain sensor mounted on the sensor mounting member A unit is attached to a fixed-side member of the outer member and the inner member, and the sensor mounting member is fixed to at least two locations separated from each other in the circumferential direction of the fixed-side member. At least one notch extending in the axial direction on the stationary side member at a position corresponding to between adjacent contact fixing portions of the sensor mounting member, and the strain sensor is adjacent to the contact fixing portion. At least 1 in between Since arranged at the vehicle compactly can be installed a sensor for detecting load, and the load applied to the wheel can be sensitively detected. Since the sensor mounting member is a simple part that can be mounted on the fixed side member, by attaching a strain sensor to the sensor mounting member, the sensor mounting member can be excellent in mass productivity and cost reduction can be achieved.

この発明の実施形態を図1ないし図3と共に説明する。この実施形態は、第3世代型の内輪回転タイプで、駆動輪支持用の車輪用軸受に適用したものである。なお、この明細書において、車両に取付けた状態で車両の車幅方向の外側寄りとなる側をアウトボード側と呼び、車両の中央寄りとなる側をインボード側と呼ぶ。   An embodiment of the present invention will be described with reference to FIGS. This embodiment is a third generation inner ring rotating type and is applied to a wheel bearing for driving wheel support. In this specification, the side closer to the outer side in the vehicle width direction of the vehicle when attached to the vehicle is referred to as the outboard side, and the side closer to the center of the vehicle is referred to as the inboard side.

このセンサ付車輪用軸受は、内周に複列の転走面3を形成した外方部材1と、これら各転走面3に対向する転走面4を形成した内方部材2と、これら外方部材1および内方部材2の転走面3,4間に介在した複列の転動体5とで構成される。この車輪用軸受は、複列のアンギュラ玉軸受型とされていて、転動体5はボールからなり、各列毎に保持器6で保持されている。上記転走面3,4は断面円弧状であり、各転走面3,4は接触角が外向きとなるように形成されている。外方部材1と内方部材2との間の軸受空間の両端は、密封装置7,8によりそれぞれ密封されている。   This sensor-equipped wheel bearing includes an outer member 1 having a double row rolling surface 3 formed on the inner periphery, an inner member 2 having a rolling surface 4 opposed to each of the rolling surfaces 3, and these It is comprised by the double row rolling element 5 interposed between the rolling surfaces 3 and 4 of the outer member 1 and the inner member 2. This wheel bearing is a double-row angular ball bearing type, and the rolling elements 5 are made of balls and are held by a cage 6 for each row. The rolling surfaces 3 and 4 are arc-shaped in cross section, and each rolling surface 3 and 4 is formed so that the contact angle is outward. Both ends of the bearing space between the outer member 1 and the inner member 2 are sealed by sealing devices 7 and 8, respectively.

外方部材1は固定側部材となるものであって、車体の懸架装置(図示せず)におけるナックルに取付けるフランジ1aを外周に有し、全体が一体の部品とされている。フランジ1aには、周方向の複数箇所に車体取付孔14が設けられている。
内方部材2は回転側部材となるものであって、車輪取付用のハブフランジ9aを有するハブ輪9と、このハブ輪9の軸部9bのインボード側端の外周に嵌合した内輪10とでなる。これらハブ輪9および内輪10に、前記各列の転走面4が形成されている。ハブ輪9のインボード側端の外周には段差を持って小径となる内輪嵌合面12が設けられ、この内輪嵌合面12に内輪10が嵌合している。ハブ輪9の中心には貫通孔11が設けられている。ハブフランジ9aには、周方向複数箇所にハブボルト(図示せず)の圧入孔15が設けられている。ハブ輪9のハブフランジ9aの根元部付近には、ホイールおよび制動部品(図示せず)を案内する円筒状のパイロット部13がアウトボード側に突出している。
The outer member 1 is a fixed side member, and has a flange 1a attached to a knuckle in a suspension device (not shown) of a vehicle body on the outer periphery, and the whole is an integral part. The flange 1a is provided with vehicle body mounting holes 14 at a plurality of locations in the circumferential direction.
The inner member 2 is a rotating side member, and includes a hub wheel 9 having a hub flange 9a for wheel mounting, and an inner ring 10 fitted to the outer periphery of the end portion on the inboard side of the shaft portion 9b of the hub wheel 9. And become. The hub wheel 9 and the inner ring 10 are formed with the rolling surfaces 4 of the respective rows. An inner ring fitting surface 12 having a small diameter with a step is provided on the outer periphery of the inboard side end of the hub wheel 9, and the inner ring 10 is fitted to the inner ring fitting surface 12. A through hole 11 is provided at the center of the hub wheel 9. The hub flange 9a is provided with press-fitting holes 15 for hub bolts (not shown) at a plurality of locations in the circumferential direction. In the vicinity of the base portion of the hub flange 9a of the hub wheel 9, a cylindrical pilot portion 13 for guiding a wheel and a brake component (not shown) protrudes toward the outboard side.

外方部材1の外周のアウトボード側部分に、センサユニット21が設けられている。センサユニット21の軸方向位置は、詳しくはアウトボード側の転走面3よりもアウトボード側であり、さらに詳しくはアウトボード側の転走面3と外方部材1のアウトボード側端との軸方向ほぼ中間位置である。このセンサユニット21は、外方部材1に取付けられるセンサ取付部材22と、このセンサ取付部材22に貼り付けられてセンサ取付部材22の歪みを測定する歪みセンサ23とでなる。   A sensor unit 21 is provided on the outboard side portion of the outer periphery of the outer member 1. The axial position of the sensor unit 21 is more specifically on the outboard side than the rolling surface 3 on the outboard side, and more specifically, between the rolling surface 3 on the outboard side and the outboard side end of the outer member 1 It is a substantially intermediate position in the axial direction. The sensor unit 21 includes a sensor attachment member 22 attached to the outer member 1 and a strain sensor 23 that is attached to the sensor attachment member 22 and measures distortion of the sensor attachment member 22.

図2および図3に示すように、センサ取付部材22は、外方部材1の外周面に沿う周方向に細長い略円弧状とされ、その両端部に円弧の内周側に張り出した接触固定部22a,22bが形成されている。歪みセンサ23は、このセンサ取付部材22の外周側で一方の接触固定部22bに近い位置に取付けられている。この実施形態の場合、歪みセンサ23はセンサ取付部材22に接着剤を用いて貼り付けられている。センサ取付部材22の断面形状は、例えば矩形状とされるが、この他に各種の形状とすることができる。   As shown in FIG. 2 and FIG. 3, the sensor mounting member 22 has a substantially arc shape elongated in the circumferential direction along the outer peripheral surface of the outer member 1, and a contact fixing portion protruding to the inner peripheral side of the arc at both ends thereof. 22a and 22b are formed. The strain sensor 23 is attached at a position close to the one contact fixing portion 22b on the outer peripheral side of the sensor attachment member 22. In the case of this embodiment, the strain sensor 23 is affixed to the sensor attachment member 22 using an adhesive. The cross-sectional shape of the sensor mounting member 22 is, for example, a rectangular shape, but can be various other shapes.

このセンサユニット21は、センサ取付部材22の長手方向が外方部材1の周方向を向くように、センサ取付部材22の接触固定部22a,22bによって外方部材1の外周に固定される。これら接触固定部22a,22bの外方部材1への固定は、例えば接着剤による接着等で行われる。センサユニット21を外方部材1に取付けた状態において、センサ取付部材22の接触固定部22a,22b以外の箇所では、外方部材1の内周面との間に隙間を生じている。   The sensor unit 21 is fixed to the outer periphery of the outer member 1 by the contact fixing portions 22 a and 22 b of the sensor mounting member 22 so that the longitudinal direction of the sensor mounting member 22 faces the circumferential direction of the outer member 1. The contact fixing portions 22a and 22b are fixed to the outer member 1 by, for example, bonding with an adhesive. In a state where the sensor unit 21 is attached to the outer member 1, a gap is formed between the sensor attachment member 22 and the inner peripheral surface of the outer member 1 at locations other than the contact fixing portions 22 a and 22 b.

2箇所の接触固定部22a,22bのいずれか一方である第1の接触固定部22aは、外方部材1に作用する荷重により外方部材1がラジアル方向に最も大きく変形する周方向箇所で外方部材1に固定され、もう一方である第2の接触固定部22bは、前記固定箇所よりもラジアル方向の変形が少ない箇所で固定される。この実施形態の場合、第1の接触固定部22aは、外方部材1の全周における真上の位置(反路面側位置)であり、第2の接触固定部22bは、真上の位置から数十度、例えば30度ないし45度程度下方の位置である。また、この実施形態では、歪みセンサ23から遠い側の接触固定部を第1の接触固定部22aとし、近い側の接触固定部を第2の接触固定部22bとしている。   The first contact fixing portion 22a, which is one of the two contact fixing portions 22a and 22b, is arranged at a circumferential location where the outer member 1 is deformed most in the radial direction by a load acting on the outer member 1. The second contact fixing portion 22b, which is fixed to the side member 1 and the other side, is fixed at a location where there is less deformation in the radial direction than the fixed location. In the case of this embodiment, the first contact fixing portion 22a is a position directly above the entire circumference of the outer member 1 (a position on the opposite road surface side), and the second contact fixing portion 22b is from a position immediately above. It is a position below several tens of degrees, for example, about 30 to 45 degrees. In this embodiment, the contact fixing portion on the side far from the strain sensor 23 is the first contact fixing portion 22a, and the contact fixing portion on the near side is the second contact fixing portion 22b.

上記センサユニット21に対応して、外方部材1の外周面に軸方向に延びる切欠き24が形成されている。この実施形態の切欠き24は、アウトボード側の転走面3の軸方向位置から外方部材1のアウトボード側端に至る溝状とされている。この切欠き24の周方向位置は、センサ取付部材22の互いに隣接する接触固定部22a,22bの間とし、この実施形態では歪みセンサ23と周方向同位相の位置とされている。切欠き24は、車輪用軸受として要求される剛性を保つ範囲内で外方部材1の剛性を部分的に低下させるために設けられる。   Corresponding to the sensor unit 21, a cutout 24 extending in the axial direction is formed on the outer peripheral surface of the outer member 1. The notch 24 in this embodiment is formed in a groove shape extending from the axial position of the rolling surface 3 on the outboard side to the outboard side end of the outer member 1. The circumferential position of the notch 24 is between the contact fixing portions 22a and 22b adjacent to each other of the sensor mounting member 22. In this embodiment, the position is in the same phase as the strain sensor 23 in the circumferential direction. The notch 24 is provided in order to partially reduce the rigidity of the outer member 1 within a range that maintains the rigidity required for the wheel bearing.

前記センサ取付部材22は、外方部材1への固定により塑性変形を起こさない形状や材質とされている。また、センサ取付部材22は、車輪用軸受に予想される最大の荷重が印加された場合でも、塑性変形を起こさない形状とする必要がある。上記の想定される最大の力は、車両故障につながらない走行において想定される最大の力である。センサ取付部材22に塑性変形が生じると、外方部材1の変形がセンサ取付部材22に正確に伝わらず、歪みの測定に影響を及ぼす。センサユニット22を上記のようにすると、これを回避することができる。   The sensor mounting member 22 has a shape or material that does not cause plastic deformation by being fixed to the outer member 1. Further, the sensor mounting member 22 needs to have a shape that does not cause plastic deformation even when the maximum load expected for the wheel bearing is applied. The above assumed maximum force is the maximum force assumed in traveling that does not lead to vehicle failure. When plastic deformation occurs in the sensor mounting member 22, the deformation of the outer member 1 is not accurately transmitted to the sensor mounting member 22 and affects the measurement of strain. If the sensor unit 22 is configured as described above, this can be avoided.

センサユニット21のセンサ取付部材22は、例えばプレス加工により製作することができる。センサ取付部材22をプレス加工品とすると、コストダウンが可能になる。
また、センサ取付部材22は、金属粉末射出成形による焼結金属品としてもよい。金属粉末射出成形は、金属、金属間化合物等の成形技術の一つであり、金属粉末をバインダーと混練する工程、この混練物を用いて射出成形する工程、成形体の脱脂処理を行なう工程、成形体の焼結を行なう工程を含む。この金属粉末射出成形によれば、一般の粉末冶金に比べて焼結密度の高い焼結体が得られ、焼結金属品を高い寸法精度で製作することができ、また機械的強度も高いという利点がある。
The sensor mounting member 22 of the sensor unit 21 can be manufactured by, for example, press working. If the sensor mounting member 22 is a pressed product, the cost can be reduced.
The sensor mounting member 22 may be a sintered metal product by metal powder injection molding. Metal powder injection molding is one of the molding techniques for metals, intermetallic compounds, etc., a step of kneading metal powder with a binder, a step of injection molding using this kneaded product, a step of degreasing the molded body, Including a step of sintering the compact. According to this metal powder injection molding, a sintered body having a higher sintering density than that of general powder metallurgy is obtained, and sintered metal products can be manufactured with high dimensional accuracy, and mechanical strength is also high. There are advantages.

歪みセンサ23としては、種々のものを使用することができる。例えば、歪みセンサ23が金属箔ストレインゲージで構成されている場合、この金属箔ストレインゲージの耐久性を考慮すると、車輪用軸受に予想される最大の荷重が印加された場合でも、センサ取付部材22における歪みセンサ23取付部分の歪み量が1500マイクロストレイン以下であることが好ましい。同様の理由から、歪みセンサ23が半導体ストレインゲージで構成されている場合は、同歪み量が1000マイクロストレイン以下であることが好ましい。また、歪みセンサ23が厚膜式センサで構成されている場合は、同歪み量が1500マイクロストレイン以下であることが好ましい。   Various strain sensors 23 can be used. For example, when the strain sensor 23 is composed of a metal foil strain gauge, considering the durability of the metal foil strain gauge, the sensor mounting member 22 can be used even when the expected maximum load is applied to the wheel bearing. It is preferable that the strain amount of the portion where the strain sensor 23 is attached is 1500 microstrain or less. For the same reason, when the strain sensor 23 is composed of a semiconductor strain gauge, the amount of strain is preferably 1000 microstrain or less. In addition, when the strain sensor 23 is formed of a thick film type sensor, the strain amount is preferably 1500 microstrain or less.

図1に示すように、歪みセンサ23の出力を処理する手段として、推定手段31および異常判定手段32が設けられている。これらの手段31,32は、この車輪用軸受の外方部材1等に取付けられた回路基板等に電子回路装置(図示せず)に設けられたものであっても、また自動車の電気制御ユニット(ECU)に設けられたものであっても良い。   As shown in FIG. 1, an estimation unit 31 and an abnormality determination unit 32 are provided as units for processing the output of the strain sensor 23. These means 31 and 32 may be provided in an electronic circuit device (not shown) on a circuit board or the like attached to the outer member 1 of the wheel bearing, or may be an electric control unit of an automobile. (ECU) may be provided.

上記構成の車輪用軸受の作用を説明する。ハブ輪9に荷重が印加されると、転動体5を介して外方部材1が変形し、その変形は外方部材1に取付けられたセンサ取付部材22に伝わり、センサ取付部材22が変形する。このセンサ取付部材22の歪みを、歪センサ23により測定する。この際、センサ取付部材22は外方部材1におけるセンサ取付部材22の固定箇所のラジアル方向の変形に従って変形する。外方部材1の外周面における一対の接触固定部22a,22b間に対応する位置に、軸方向に延びる切欠き24が設けられているため、外方部材1における切欠き24の周方向両側部分の剛性が低下し、この部分は他の部分よりも歪みが大きくなり、その大きな歪みがセンサ取付部材22に伝わる。また、センサ取付部材22は外方部材1に比べて薄肉となっているため歪みが集中し、外方部材1よりも大きな歪みが得られる。これらのことから、センサ取付部材22における隣接する接触固定部22a,22b間に配した歪みセンサ23でセンサ取付部材22歪みを測定することにより、外方部材1の歪みを感度良く検出することができる。   The operation of the wheel bearing having the above configuration will be described. When a load is applied to the hub wheel 9, the outer member 1 is deformed via the rolling elements 5, and the deformation is transmitted to the sensor mounting member 22 attached to the outer member 1, and the sensor mounting member 22 is deformed. . The strain of the sensor mounting member 22 is measured by the strain sensor 23. At this time, the sensor mounting member 22 is deformed according to the radial deformation of the fixing portion of the sensor mounting member 22 in the outer member 1. Since notches 24 extending in the axial direction are provided at positions corresponding to the pair of contact fixing portions 22a and 22b on the outer peripheral surface of the outer member 1, both sides in the circumferential direction of the notches 24 in the outer member 1 are provided. The rigidity of this part decreases, and this part becomes more strained than the other part, and the large strain is transmitted to the sensor mounting member 22. Further, since the sensor mounting member 22 is thinner than the outer member 1, the strain concentrates and a larger strain than that of the outer member 1 is obtained. For these reasons, the strain of the outer member 1 can be detected with high sensitivity by measuring the strain of the sensor mounting member 22 with the strain sensor 23 disposed between the adjacent contact fixing portions 22a and 22b of the sensor mounting member 22. it can.

センサ取付部材22の2箇所の接触固定部22a,22bのうち、第1の接触固定部22aは、外方部材1に作用する外力、またはタイヤと路面間の作用力によって、外方部材1の他の箇所と比べてラジアル方向の変形が著しい箇所に取付けられていることが好ましい。外方部材1は、円周方向の各部によって、上記外力や作用力によるラジアル方向変形の程度が異なる。FEM(有限要素法)解析の結果によると、タイヤと路面間の接触点に作用する軸方向荷重に対する外方部材1のラジアル方向の変形は、反路面側および路面側の位置、つまり鉛直方向の真上位置および真下位置が最も大きくなる。この実施形態では、外方部材1のラジアル方向の変形の最も大きな位置となる鉛直方向の真上位置に第1の接触固定部22aを配置したため、感度良く、したがって精度良く、外方部材1の歪みを検出することができる。
すなわち、第1の接触固定部22aが外方部材1における他の箇所と比べてラジアル方向に大きく変形する箇所に取付けられていると、センサ取付部材22は、変形の少ない第2の接触固定部22bが支点となって、第1の接触固定部22aが外方部材1の大きな変形に伴い大きく変形する。そのため、センサ取付部材22の歪みセンサ23の取付位置がより一層大きな歪みを生じることになり、歪みセンサ23により、外方部材1の歪みをより一層感度良く検出することができる。
Of the two contact fixing portions 22a and 22b of the sensor mounting member 22, the first contact fixing portion 22a is formed by the external force acting on the outer member 1 or the acting force between the tire and the road surface. It is preferable that it is attached to a location where the radial deformation is significant compared to other locations. The outer member 1 has a different degree of radial deformation due to the external force and the acting force depending on each part in the circumferential direction. According to the result of FEM (finite element method) analysis, the radial deformation of the outer member 1 with respect to the axial load acting on the contact point between the tire and the road surface is the position on the opposite road surface side and the road surface side, that is, in the vertical direction. The directly above position and the directly below position are the largest. In this embodiment, since the first contact fixing portion 22a is disposed at a position directly above the vertical direction, which is the position where the radial deformation of the outer member 1 is greatest, the sensitivity of the outer member 1 is improved. Distortion can be detected.
That is, when the first contact fixing portion 22a is attached to a location that is greatly deformed in the radial direction as compared with other locations in the outer member 1, the sensor attachment member 22 is a second contact fixing portion that is less deformed. 22b becomes a fulcrum, and the first contact fixing portion 22a is greatly deformed as the outer member 1 is largely deformed. Therefore, the mounting position of the strain sensor 23 of the sensor mounting member 22 causes a greater strain, and the strain sensor 23 can detect the strain of the outer member 1 with higher sensitivity.

この実施形態では、外方部材1の切欠き24の位置を、センサ取付部材22の2箇所の接触固定部22a,22b間における第1の接触固定部22aから遠い側として、外方部材1のラジアル方向の変形が最も大きい鉛直方向の真上位置から遠ざけている。切欠き24は、車輪用軸受として要求される剛性を保つ範囲内で設けられるが、外方部材1の強度を考慮すると、なるべく外方部材1における変形が大きい箇所、つまり大きな荷重を受ける箇所を避けて設けることが好ましいからである。   In this embodiment, the position of the notch 24 of the outer member 1 is set as the side farther from the first contact fixing portion 22a between the two contact fixing portions 22a and 22b of the sensor mounting member 22, and It is away from the position directly above the vertical direction where the radial deformation is greatest. The notch 24 is provided within a range that maintains the rigidity required for the wheel bearing. However, in consideration of the strength of the outer member 1, a portion where the deformation of the outer member 1 is as large as possible, that is, a portion that receives a large load, is provided. This is because it is preferable to avoid it.

センサユニット21を外方部材1に取付ける軸方向位置は、実施形態におけるように外方部材1のアウトボード側の転走面3よりもアウトボード側位置とするのが好ましい。これは、アウトボード側の転走面3よりもアウトボード側位置であると、荷重の方向に応じて歪みに正負の方向性が生じ、荷重の正逆の方向を検出することができるからである。
FEM解析および試験結果によると、外方部材1のラジアル方向歪みおよび周方向歪みとも、前記外力あるいは作用力等の荷重の正負によって歪みに正負の方向性を持つのは、外方部材1における前記3箇所に区分した位置のうち、アウトボード側の部分のみであった。したがって、荷重の正負の方向を検出するには、センサユニット21を外方部材1におけるアウトボード側の位置に配置することが必要である。
The axial position where the sensor unit 21 is attached to the outer member 1 is preferably set to the outboard side position relative to the rolling surface 3 on the outboard side of the outer member 1 as in the embodiment. This is because if the position is on the outboard side relative to the rolling surface 3 on the outboard side, positive and negative directionality occurs in the strain according to the direction of the load, and the forward and reverse directions of the load can be detected. is there.
According to the FEM analysis and the test results, both the radial strain and the circumferential strain of the outer member 1 have positive and negative directionality in the strain due to the positive / negative of the load such as the external force or the acting force. Of the three positions, only the part on the outboard side. Therefore, in order to detect the positive / negative direction of the load, it is necessary to arrange the sensor unit 21 at a position on the outboard side of the outer member 1.

また、センサユニット21は、この実施形態のように、外方部材1の周面に設けるのが好ましい。センサユニット21は、固定側部材の周面および端面のいずれに取付けても良いが、周面に取付けた場合、センサ取付部材に固定側部材の変形が伝わり易く、固定側部材の歪みをより感度良く検出することができる。   The sensor unit 21 is preferably provided on the peripheral surface of the outer member 1 as in this embodiment. The sensor unit 21 may be attached to either the peripheral surface or the end surface of the fixed side member. However, when the sensor unit 21 is attached to the peripheral surface, the deformation of the fixed side member is easily transmitted to the sensor mounting member, and the distortion of the fixed side member is more sensitive. It can be detected well.

荷重の方向や大きさによって歪みの変化が異なるため、予め歪みと荷重の関係を実験やシミュレーションにて求めておけば、車輪用軸受に作用する外力、またはタイヤと路面間の作用力を算出することができる。前記推定手段31は、このように実験やシミュレーションにより予め求めて設定しておいた歪みと荷重の関係から、歪センサ23の出力により、車輪用軸受に作用する外力、またはタイヤと路面間の作用力をそれぞれ算出する。前記異常判定手段32は、推定手段31により算出された車輪用軸受に作用する外力、またはタイヤと路面間の作用力が許容値を超えたと判断される場合に、外部に異常信号を出力する。この異常信号を、自動車の車両制御に使用することができる。また、リアルタイムで車輪用軸受に作用する外力、またはタイヤと路面間の作用力を出力すると、よりきめ細かな車両制御が可能となる。   Since the strain changes depending on the direction and magnitude of the load, if the relationship between the strain and the load is obtained in advance through experiments and simulations, the external force acting on the wheel bearing or the acting force between the tire and the road surface is calculated. be able to. From the relationship between the strain and the load obtained and set in advance through experiments and simulations, the estimation means 31 can be applied to the external force acting on the wheel bearing or the action between the tire and the road surface by the output of the strain sensor 23. Calculate each force. The abnormality determining means 32 outputs an abnormality signal to the outside when it is determined that the external force acting on the wheel bearing calculated by the estimating means 31 or the acting force between the tire and the road surface exceeds an allowable value. This abnormal signal can be used for vehicle control of an automobile. Further, when an external force acting on the wheel bearing in real time or an acting force between the tire and the road surface is output, finer vehicle control becomes possible.

また、車輪用軸受は内方部材2によって予圧が付加されるが、その予圧によってもセンサ取付部材22は変形するため、予め歪みと予圧の関係を実験やシミュレーションにて求めておけば、車輪用軸受の予圧量を算出することができる。前記推定手段31は、このように実験やシミュレーションにより予め求めて設定しておいた歪みと予圧の関係から、車輪用軸受の予圧量を算出する。これにより、車輪用軸受の予圧の状態を知ることが出来る。また、車輪用軸受の組立時に予圧の調整が容易になる。   The wheel bearing is preloaded by the inner member 2, but the sensor mounting member 22 is also deformed by the preload. Therefore, if the relationship between strain and preload is obtained in advance through experiments and simulations, the wheel bearing is used. The amount of preload of the bearing can be calculated. The estimation means 31 calculates the preload amount of the wheel bearing from the relationship between the strain and the preload that have been obtained and set in advance through experiments and simulations. Thereby, the state of the preload of the wheel bearing can be known. Also, the preload can be easily adjusted when the wheel bearing is assembled.

この実施形態では、センサユニット21を1箇所にだけ設けた構成としているが、例えば図4あるいは図5に示すように、センサユニット21を2箇所以上に設けた構成としても良く、また図5に示すように、1つのセンサユニット21につき歪みセンサ23を2箇所以上に配置し、それに対応させて外方部材1の2箇所以上に切欠24を設けた構成としても良い。このようにセンサユニット21を複数箇所に設けたり、1つのセンサユニット21につき歪みセンサ23を複数箇所に設けたりすると、より一層精度の高い荷重の検出が可能となる。
また、センサユニット21を複数設ける場合、各センサユニット21は、外方部材1の全周の象限(第1〜第4象限)のうち互いに異なる象限に配置しても良い。これにより、異なる方向の荷重が検出できる。
In this embodiment, the sensor unit 21 is provided only at one place. However, for example, as shown in FIG. 4 or FIG. 5, the sensor unit 21 may be provided at two or more places. As shown, the strain sensor 23 may be arranged at two or more locations per sensor unit 21 and the notches 24 may be provided at two or more locations on the outer member 1 corresponding to the sensor. As described above, when the sensor units 21 are provided at a plurality of locations, or the strain sensors 23 are provided at a plurality of locations for one sensor unit 21, it is possible to detect a load with higher accuracy.
Further, when a plurality of sensor units 21 are provided, each sensor unit 21 may be arranged in quadrants different from each other among the quadrants of the entire circumference of the outer member 1 (first to fourth quadrants). Thereby, loads in different directions can be detected.

図6および図7は異なる実施形態を示す。この車輪用軸受は、センサ取付部材22と外方部材1との固定をボルトを用いて行なうものである。図7に示すように、このセンサ取付部材22は、全体形状は図3に示すセンサ取付部材22と同じであり、第1の接触固定部22aおよび第2の接触固定部22bに径方向のボルト挿通孔40が形成されている。外方部材1には、前記ボルト挿通孔40に対応する位置に、内周面に雌ねじが形成されたボルト螺着孔41がそれぞれ形成されている。図6に示すように、センサユニット21は、センサ取付部材22のボルト挿通孔40に外周側からボルト42を挿通し、そのボルト42の雄ねじ部42aをボルト螺着孔41に螺着させることにより、外方部材1に固定される。   6 and 7 show different embodiments. In this wheel bearing, the sensor mounting member 22 and the outer member 1 are fixed using bolts. As shown in FIG. 7, the sensor mounting member 22 has the same overall shape as the sensor mounting member 22 shown in FIG. 3, and the first contact fixing portion 22a and the second contact fixing portion 22b have radial bolts. An insertion hole 40 is formed. The outer member 1 is formed with a bolt screwing hole 41 having an inner peripheral surface formed with a female screw at a position corresponding to the bolt insertion hole 40. As shown in FIG. 6, the sensor unit 21 inserts a bolt 42 from the outer peripheral side into the bolt insertion hole 40 of the sensor mounting member 22 and screwes the male thread portion 42 a of the bolt 42 into the bolt screw hole 41. The outer member 1 is fixed.

センサ取付部材22と外方部材1との固定については、接着剤およびボルトのいずれを用いても良い。また、両者を併用してもよい。さらには、接着剤やボルトを用いず、溶接でセンサ取付部材22と外方部材1とを固定しても良い。
これらの固定方法のいずれを採用した場合でも、センサ取付部材22と外方部材1とを強固に固定することができる。そのため、センサ取付部材22が外方部材1に対して位置ずれすることがなく、外方部材1の変形をセンサ取付部材22に正確に伝えることが可能になる。
For fixing the sensor mounting member 22 and the outer member 1, either an adhesive or a bolt may be used. Moreover, you may use both together. Furthermore, you may fix the sensor attachment member 22 and the outward member 1 by welding, without using an adhesive agent and a volt | bolt.
Regardless of which of these fixing methods is employed, the sensor mounting member 22 and the outer member 1 can be firmly fixed. Therefore, the sensor mounting member 22 is not displaced with respect to the outer member 1, and the deformation of the outer member 1 can be accurately transmitted to the sensor mounting member 22.

図8はセンサユニットの異なる実施形態を示す。このセンサユニット21は、歪みセンサ23とは別に温度センサ25が設けられている。なお、センサ取付部材22の形状は図3に示すものと同じものと同じであり、歪みセンサ23および温度センサ25はセンサ取付部材22の接触固定部22a,22b間に取付けられている。温度センサ25としては、例えば白金測温抵抗または熱電対またはサーミスタを使用することができる。さらに、これら以外の温度を検出することが可能なセンサを使用することもできる。   FIG. 8 shows a different embodiment of the sensor unit. The sensor unit 21 is provided with a temperature sensor 25 separately from the strain sensor 23. The sensor mounting member 22 has the same shape as that shown in FIG. 3, and the strain sensor 23 and the temperature sensor 25 are mounted between the contact fixing portions 22 a and 22 b of the sensor mounting member 22. As the temperature sensor 25, for example, a platinum resistance thermometer, a thermocouple, or a thermistor can be used. Furthermore, a sensor capable of detecting a temperature other than these can also be used.

このセンサユニット21を設けた車軸用軸受も、歪みセンサ23がセンサ取付部材22の歪みを検出し、その歪みにより車輪に加わる荷重を測定する。ところで、車輪用軸受は使用中に温度が変化し、その温度変化がセンサ取付部材22の歪み、または歪みセンサ23の動作に影響を及ぼす。そこで、センサ取付部材22に配置した温度センサ25にてセンサ取付部材22の温度を検出し、その検出した温度により歪みセンサ23の出力を補正することにより、歪みセンサ23の温度による影響を除去することができる。これにより、精度の高い荷重検出を行なうことが可能となる。   Also in the axle bearing provided with the sensor unit 21, the strain sensor 23 detects the strain of the sensor mounting member 22, and measures the load applied to the wheel by the strain. By the way, the temperature of the wheel bearing changes during use, and the temperature change affects the strain of the sensor mounting member 22 or the operation of the strain sensor 23. Therefore, the temperature sensor 25 disposed on the sensor mounting member 22 detects the temperature of the sensor mounting member 22 and corrects the output of the strain sensor 23 based on the detected temperature, thereby eliminating the influence of the temperature of the strain sensor 23. be able to. Thereby, it is possible to detect the load with high accuracy.

図9はセンサユニットのさらに異なる実施形態を示す。このセンサユニット21は、歪みセンサ23とは別に各種センサ26が設けられている。各種センサ26は、加速度センサおよび振動センサのうちの少なくとも一つとする。なお、センサ取付部材22の形状は図3に示すものと同じものと同じであり、歪みセンサ23および各種センサ26はセンサ取付部材22の接触固定部22a,22b間に取付けられている。
このように、センサ取付部材22に歪みセンサ23および各種センサ26を取付けると、荷重と車輪用軸受の状態を1箇所で測定することができ、配線等を簡略なものとすることができる。
FIG. 9 shows a further different embodiment of the sensor unit. The sensor unit 21 is provided with various sensors 26 in addition to the strain sensor 23. The various sensors 26 are at least one of an acceleration sensor and a vibration sensor. The sensor mounting member 22 has the same shape as that shown in FIG. 3, and the strain sensor 23 and various sensors 26 are mounted between the contact fixing portions 22 a and 22 b of the sensor mounting member 22.
Thus, when the strain sensor 23 and the various sensors 26 are attached to the sensor attachment member 22, the load and the state of the wheel bearing can be measured at one place, and wiring and the like can be simplified.

図10は前記各実施形態とは異なる方法で歪みセンサを形成したセンサユニットの構造を示す。このセンサユニット21は、センサ取付部材22の上に絶縁層50が形成され、この絶縁層50の表面の両側に対を成す電極51,52が形成され、これら電極51,52の間で前記絶縁層50の上に歪みセンサとなる歪み測定用抵抗体53が形成され、さらに電極51,52と歪み測定用抵抗体53の上に保護膜54を形成された構造となっている。   FIG. 10 shows a structure of a sensor unit in which a strain sensor is formed by a method different from that in each of the embodiments. In this sensor unit 21, an insulating layer 50 is formed on the sensor mounting member 22, and a pair of electrodes 51, 52 are formed on both sides of the surface of the insulating layer 50. A strain measuring resistor 53 serving as a strain sensor is formed on the layer 50, and a protective film 54 is further formed on the electrodes 51 and 52 and the strain measuring resistor 53.

このセンサユニット21の製造方法を次に示す。まず、ステンレス鋼等の金属材料で形成されたセンサ取付部材22の表面にガラス等の絶縁材料を印刷、焼成して絶縁層50を形成する。次に、絶縁層50の表面に、導電性材料を印刷、焼成して電極51,52を形成する。さらに、電極51と電極52との間に、抵抗体となる材料を印刷、焼成して歪み測定用抵抗体53を形成する。さらに、これら電極51,52および歪み測定用抵抗体53を保護するために、保護膜54を形成する。   A method for manufacturing the sensor unit 21 will be described below. First, the insulating layer 50 is formed by printing and baking an insulating material such as glass on the surface of the sensor mounting member 22 formed of a metal material such as stainless steel. Next, a conductive material is printed and baked on the surface of the insulating layer 50 to form the electrodes 51 and 52. Furthermore, a strain measurement resistor 53 is formed by printing and baking a material to be a resistor between the electrode 51 and the electrode 52. Further, a protective film 54 is formed to protect the electrodes 51 and 52 and the strain measuring resistor 53.

通常、歪みセンサはセンサ取付部材22に対して接着による固定が行なわれるが、この固定方法は、経年変化による接着強度の低下が歪みセンサの検出に影響を及ぼす可能性があり、またコストアップの原因ともなっている。これに対し、この実施形態のように、センサ取付部材22の表面に絶縁層50を印刷および焼成により形成し、この絶縁層50の上に電極51,52および歪みセンサとなる歪み測定用抵抗体53を印刷および焼成により形成したセンサユニット21とすると、信頼性の向上とコストダウンを図ることが可能となる。   Usually, the strain sensor is fixed to the sensor mounting member 22 by bonding. However, this fixing method may affect the detection of the strain sensor due to a decrease in bonding strength due to aging. It is also a cause. On the other hand, as in this embodiment, the insulating layer 50 is formed on the surface of the sensor mounting member 22 by printing and baking, and the electrodes 51 and 52 and the strain measurement resistor serving as the strain sensor are formed on the insulating layer 50. When the sensor unit 21 is formed by printing and baking 53, it is possible to improve reliability and reduce costs.

図11ないし図13はさらに異なる実施形態を示す。この車輪用軸受は、センサユニット21に設けられた歪みセンサや前述の各センサ(温度センサ、加速度センサ、振動センサ)の出力を処理するためのセンサ信号処理回路ユニット60を組み込んだものである。このセンサ信号処理回路ユニット60は外方部材1の外周面に取付けられている。   11 to 13 show a further different embodiment. This wheel bearing incorporates a sensor signal processing circuit unit 60 for processing the outputs of the strain sensors provided in the sensor unit 21 and the aforementioned sensors (temperature sensor, acceleration sensor, vibration sensor). The sensor signal processing circuit unit 60 is attached to the outer peripheral surface of the outer member 1.

センサ信号処理回路ユニット60は、樹脂等で製作されたハウジング61内に、ガラスエポキシ等で製作された回路基板62を有し、その回路基板62上には、前記歪みセンサ23の出力信号を処理するオペアンプ、抵抗、マイコン等や歪みセンサ23を駆動する電源用の電気・電子部品63が配置されている。また、歪みセンサ23の配線と回路基板62とを接合する接合部64を有している。また、外部からの電源供給や外部へセンサ信号処理回路によって処理された出力信号を出力するケーブル65を有している。センサユニット21に前述の各センサ(温度センサ、加速度センサ、振動センサ)が設けられている場合、センサ信号処理回路ユニット60にはそれぞれのセンサに対応した回路基板62、電気・電子部品63、接合部64、ケーブル65等が設けられる。   The sensor signal processing circuit unit 60 has a circuit board 62 made of glass epoxy or the like in a housing 61 made of resin or the like, and the output signal of the strain sensor 23 is processed on the circuit board 62. An operational amplifier, a resistor, a microcomputer, etc., and a power supply electric / electronic component 63 for driving the strain sensor 23 are arranged. In addition, a joint portion 64 that joins the wiring of the strain sensor 23 and the circuit board 62 is provided. Further, it has a cable 65 for supplying power from the outside and outputting an output signal processed by the sensor signal processing circuit to the outside. When the sensor unit 21 is provided with each of the above-described sensors (temperature sensor, acceleration sensor, vibration sensor), the sensor signal processing circuit unit 60 includes a circuit board 62, an electric / electronic component 63, a joint corresponding to each sensor. A portion 64, a cable 65, and the like are provided.

一般的には、車輪用軸受に設けられた各センサの出力を処理するセンサ信号処理回路ユニットは自動車の電気制御ユニット(ECU)に設けられるが、この実施形態のように、車輪用軸受におけるセンサユニット21の近傍にセンサ信号処理回路ユニット60を設けることで、センサユニット21からセンサ信号処理回路ユニット60への配線の手間が簡略化でき、また車輪用軸受以外の場所にセンサ信号処理回路ユニット60を設ける場合よりも、センサ信号処理回路ユニット60をコンパクトに設置できる。   In general, a sensor signal processing circuit unit for processing the output of each sensor provided in a wheel bearing is provided in an electric control unit (ECU) of an automobile. As in this embodiment, a sensor in a wheel bearing is provided. By providing the sensor signal processing circuit unit 60 in the vicinity of the unit 21, labor for wiring from the sensor unit 21 to the sensor signal processing circuit unit 60 can be simplified, and the sensor signal processing circuit unit 60 is provided at a place other than the wheel bearing. The sensor signal processing circuit unit 60 can be installed more compactly than the case of providing the sensor.

なお、前記各実施形態では、外方部材1が固定側部材である場合につき説明したが、この発明は、内方部材が固定側部材である車輪用軸受にも適用することができ、その場合、センサユニット21は内方部材の内周となる周面に設ける。
また、前記各実施形態では第3世代型の車輪用軸受に適用した場合につき説明したが、この発明は、軸受部分とハブとが互いに独立した部品となる第1または第2世代型の車輪用軸受や、内方部材の一部が等速ジョイントの外輪で構成される第4世代型の車輪用軸受にも適用することができる。また、このセンサ付車輪用軸受は、従動輪用の車輪用軸受にも適用でき、さらに各世代形式のテーパころタイプの車輪用軸受にも適用することができる。
In each of the above embodiments, the case where the outer member 1 is a fixed side member has been described. However, the present invention can also be applied to a wheel bearing in which the inner member is a fixed side member. The sensor unit 21 is provided on the peripheral surface that is the inner periphery of the inner member.
In each of the above embodiments, the case where the present invention is applied to a third generation type wheel bearing has been described. However, the present invention is applicable to a first or second generation type wheel in which the bearing portion and the hub are independent parts. The present invention can also be applied to a bearing or a fourth-generation type wheel bearing in which a part of the inner member is composed of an outer ring of a constant velocity joint. Further, this sensor-equipped wheel bearing can be applied to a wheel bearing for a driven wheel, and can also be applied to a tapered roller type wheel bearing of each generation type.

この発明の実施形態にかかるセンサ付車輪用軸受の断面図とその検出系の概念構成のブロック図とを組み合わせて示す図である。It is a figure showing combining the sectional view of the wheel bearing with a sensor concerning the embodiment of this invention, and the block diagram of the conceptual composition of the detection system. 同センサ付車輪用軸受の外方部材とセンサユニットとを示す正面図である。It is a front view which shows the outward member and sensor unit of the wheel bearing with a sensor. (A)は同センサユニットの平面図、(B)はその正面図である。(A) is a plan view of the sensor unit, and (B) is a front view thereof. 異なるセンサ付車輪用軸受の外方部材とセンサユニットとを示す正面図である。It is a front view which shows the outward member and sensor unit of a different wheel bearing with a sensor. さらに異なるセンサ付車輪用軸受の外方部材とセンサユニットとを示す正面図である。Furthermore, it is a front view which shows the outward member and sensor unit of a different bearing for wheels with a sensor. この発明の異なる実施形態にかかるセンサ付車輪用軸受の上半分を示す断面図である。It is sectional drawing which shows the upper half of the bearing for sensor wheels concerning different embodiment of this invention. (A)は同センサ付車輪用軸受のセンサユニットの平面図、(B)はそのVIIb−VIIb断面図である。(A) is a top view of the sensor unit of the wheel bearing with a sensor, (B) is the VIIb-VIIb sectional drawing. (A)は異なるセンサユニットの平面図、(B)はその正面図である。(A) is a top view of a different sensor unit, (B) is the front view. (A)はさらに異なるセンサユニットの平面図、(B)はその正面図である。(A) is a plan view of still another sensor unit, and (B) is a front view thereof. さらに異なるセンサユニットの断面構造を示す図である。It is a figure which shows the cross-section of another sensor unit. この発明のさらに異なる実施形態にかかるセンサ付車輪用軸受の断面図である。It is sectional drawing of the bearing for wheels with a sensor concerning further different embodiment of this invention. 同センサ付車輪用軸受の外方部材とセンサユニットとを示す正面図である。It is a front view which shows the outward member and sensor unit of the wheel bearing with a sensor. センサ信号処理回路ユニットの側面図である。It is a side view of a sensor signal processing circuit unit.

符号の説明Explanation of symbols

1…外方部材(固定側部材)
2…内方部材(回転側部材)
3,4…転走面
5…転動体
7,8…密封装置
21…センサユニット
22…センサ取付部材
22a…第1の接触固定部
22b…第2の接触固定部
23…歪みセンサ
24…切欠き
25…温度センサ
26…各種センサ
31…推定手段
32…異常判定手段
40,41…ボルト挿通孔
42,43…ボルト螺着孔
44…ボルト
50…絶縁層
51,52…電極
53…歪み測定用抵抗体
54…保護膜
60…センサ信号処理回路ユニット
61…ハウジング
62…回路基板
63…電気・電子部品
64…接合部
65…ケーブル
1 ... Outer member (fixed side member)
2 ... Inward member (rotary member)
3, 4 ... rolling surface 5 ... rolling elements 7, 8 ... sealing device 21 ... sensor unit 22 ... sensor mounting member 22a ... first contact fixing part 22b ... second contact fixing part 23 ... strain sensor 24 ... notch 25 ... temperature sensor 26 ... various sensors 31 ... estimation means 32 ... abnormality determination means 40, 41 ... bolt insertion holes 42, 43 ... bolt screw holes 44 ... bolt 50 ... insulating layers 51, 52 ... electrodes 53 ... resistance for strain measurement Body 54 ... Protective film 60 ... Sensor signal processing circuit unit 61 ... Housing 62 ... Circuit board 63 ... Electrical / electronic component 64 ... Joint 65 ... Cable

Claims (14)

複列の転走面が内周に形成された外方部材と、この外方部材の転走面と対向する転走面を形成した内方部材と、両転走面間に介在した複列の転動体とを備え、車体に対して車輪を回転自在に支持する車輪用軸受において、
センサ取付部材およびこのセンサ取付部材に取付けられた歪みセンサからなるセンサユニットを、前記外方部材および内方部材のうちの固定側部材に取付け、前記センサ取付部材は、前記固定側部材の円周方向に離れた少なくとも2箇所にそれぞれ固定される複数の接触固定部を有し、このセンサ取付部材の互いに隣接する接触固定部間に対応する位置で、前記固定側部材に軸方向に延びる少なくとも1箇所の切欠きを設け、前記歪みセンサは隣接する前記接触固定部間で少なくとも1箇所に配したことを特徴とするセンサ付車輪用軸受。
An outer member in which a double row rolling surface is formed on the inner periphery, an inner member having a rolling surface opposite to the rolling surface of the outer member, and a double row interposed between both rolling surfaces In a wheel bearing for supporting a wheel rotatably with respect to the vehicle body,
A sensor unit comprising a sensor attachment member and a strain sensor attached to the sensor attachment member is attached to a fixed side member of the outer member and the inner member, and the sensor attachment member has a circumference of the fixed side member. A plurality of contact fixing portions fixed respectively in at least two locations separated in the direction, and at least one extending in the axial direction to the fixed side member at a position corresponding to the contact fixing portions adjacent to each other of the sensor mounting member. The sensor-equipped wheel bearing according to claim 1, wherein a notch is provided at a location, and the strain sensor is disposed at least at one location between the adjacent contact fixing portions.
請求項1において、前記接触固定部の少なくとも1箇所が、前記固定側部材に作用する外力、またはタイヤと路面間の作用力によって、固定側部材の円周方向における他の箇所と比べてラジアル方向に大きく変形する円周方向箇所に取付けられているセンサ付車輪用軸受。   2. The radial direction according to claim 1, wherein at least one portion of the contact fixing portion has a radial direction as compared with other portions in the circumferential direction of the fixed side member due to an external force acting on the fixed side member or an acting force between the tire and the road surface. Sensor-equipped wheel bearings that are attached to circumferentially deformed locations. 請求項1または請求項2において、前記センサユニットは、固定側部材におけるアウトボード側部分に取付けられているセンサ付車輪用軸受。   The sensor-equipped wheel bearing according to claim 1, wherein the sensor unit is attached to an outboard side portion of the fixed side member. 請求項1ないし請求項3のいずれか1項において、前記センサユニットは前記固定側部材の周面に設けられているセンサ付車輪用軸受。   The sensor-equipped wheel bearing according to any one of claims 1 to 3, wherein the sensor unit is provided on a peripheral surface of the fixed-side member. 請求項1ないし請求項4のいずれか1項において、前記センサユニットは複数であるセンサ付車輪用軸受。   5. The sensor-equipped wheel bearing according to claim 1, wherein the sensor unit includes a plurality of sensor units. 請求項1ないし請求項5のいずれか1項において、前記歪みセンサの出力によって、車両用軸受に作用する外力、またはタイヤと路面間の作用力、または車両用軸受の予圧量を推定する推定手段を設けたセンサ付車輪用軸受。   6. The estimating means according to claim 1, wherein an external force acting on the vehicle bearing, an acting force between the tire and the road surface, or a preload amount of the vehicle bearing is estimated based on the output of the strain sensor. A wheel bearing with sensor. 請求項1ないし請求項6のいずれか1項において、前記固定側部材に作用する外力、または前記タイヤと路面間に作用する作用力として、想定される最大の力が印加された状態においても、前記センサユニットのセンサ取付部材が塑性変形しないものとしたセンサ付車輪用軸受。   In any one of claims 1 to 6, even in a state in which an assumed maximum force is applied as an external force acting on the stationary member or an acting force acting between the tire and a road surface. A sensor-equipped wheel bearing wherein the sensor mounting member of the sensor unit is not plastically deformed. 請求項1ないし請求項7のいずれか1項において、前記センサ取付部材がプレス加工品であるセンサ付車輪用軸受。   The sensor-equipped wheel bearing according to any one of claims 1 to 7, wherein the sensor mounting member is a press-processed product. 請求項1ないし請求項7のいずれか1項において、前記センサ取付部材が金属粉末射出成形による焼結金属であるセンサ付車輪用軸受。   The wheel bearing with a sensor according to any one of claims 1 to 7, wherein the sensor mounting member is a sintered metal by metal powder injection molding. 請求項1ないし請求項9のいずれか1項において、前記センサ取付部材と前記固定側部材との固定を、ボルトおよび接着剤のいずれかを用いて行なうか、または両者を併用して行なうか、または溶接を用いて行なったセンサ付車輪用軸受。   In any one of Claims 1 thru | or 9, whether the said sensor attachment member and the said fixing | fixed side member are fixed using either a volt | bolt and an adhesive agent, or performing both together, Or a wheel bearing with sensor made by welding. 請求項1ないし請求項10のいずれか1項において、前記センサ取付部材に温度センサを設けたセンサ付車輪用軸受。   11. The wheel bearing with sensor according to claim 1, wherein a temperature sensor is provided on the sensor mounting member. 請求項1ないし請求項11のいずれか1項において、前記センサ取付部材に加速度センサおよび振動センサのうち少なくとも一つを設けたセンサ付車輪用軸受。   12. The sensor-equipped wheel bearing according to claim 1, wherein the sensor mounting member is provided with at least one of an acceleration sensor and a vibration sensor. 請求項1ないし請求項12のいずれか1項において、前記歪みセンサは、前記センサ取付部材の表面に絶縁層を印刷および焼成によって形成し、前記絶縁層の上に電極および歪み測定用抵抗体を印刷および焼成によって形成したものであるセンサ付車輪用軸受。   13. The strain sensor according to claim 1, wherein the strain sensor is formed by printing and baking an insulating layer on a surface of the sensor mounting member, and an electrode and a strain measuring resistor are formed on the insulating layer. Sensor-equipped wheel bearing formed by printing and firing. 請求項1ないし請求項13のいずれか1項において、前記センサユニットの近傍に、前記歪みセンサの出力信号を処理するセンサ信号処理回路を有するセンサ信号処理回路ユニットを設けたセンサ付車輪用軸受。   14. The sensor-equipped wheel bearing according to claim 1, wherein a sensor signal processing circuit unit having a sensor signal processing circuit for processing an output signal of the strain sensor is provided in the vicinity of the sensor unit.
JP2006062251A 2006-03-08 2006-03-08 Wheel bearing with sensor Expired - Fee Related JP4889324B2 (en)

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EP07713566.3A EP2006653B1 (en) 2006-03-08 2007-03-08 Bearing for wheel with sensor
US12/224,802 US7762128B2 (en) 2006-03-08 2007-03-08 Wheel support bearing assembly equipped with sensor
PCT/JP2007/000184 WO2007105367A1 (en) 2006-03-08 2007-03-08 Bearing for wheel with sensor

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JP2009156838A (en) * 2007-12-28 2009-07-16 Ntn Corp Wheel bearing with sensor
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