JP5212814B2 - Rolling bearing device with sensor - Google Patents

Description

  The present invention relates to a rolling bearing device with a sensor to which a disc rotor of a disc brake device in a vehicle such as an automobile is attached.

A rolling bearing device connected to a disk rotor or a wheel of a disk brake device is used for a suspension device of a vehicle such as an automobile (see Patent Document 1).
The rolling bearing device is provided with, for example, a rotation speed detection device (rotation detection device) for detecting the rotation speed of the wheel as information input means of an antilock brake system (ABS) of the vehicle (Patent Document 2). reference).

JP 2000-110890 A JP 2003-120703 A

  However, in recent years, there has been an increasing demand for shortening the braking distance of the vehicle, which increases the heat generation of the disk rotor, so that the heat is transmitted to the rotation detection device provided around the disk rotor and may become high temperature. In particular, since the rotation sensor used in the above-described rotation detection device is manufactured by resin molding, it is weak against heat as compared with the metal parts around the disk rotor. Therefore, there is a problem that the rotation sensor has a problem due to heat, and a technique for solving such a problem is desired.

  An object of the present invention is to provide a sensor-equipped rolling bearing device in which the sensor is directly cooled by the airflow from the blower fan on the rotating member side in the rolling bearing device so as not to cause a malfunction due to heat and to improve reliability. There is to do.

Means for Solving the Problems and Effects of the Invention

  In order to solve the above-described problems, a sensor-equipped rolling bearing device according to the present invention is connected to an outer ring connected to a vehicle fixing member on the vehicle inner side, a disk rotor and a wheel on the vehicle outer side, and rotates relative to the outer ring. An inner ring, an annular magnetic encoder portion that is fixed to the inner side of the inner wheel of the inner ring and whose magnetic characteristics alternately change in the circumferential direction, and the vehicle fixing member so as to detect a magnetic change due to rotation of the magnetic encoder portion Or a sensor-equipped rolling bearing device comprising an ABS sensor fixed to the outer ring and disposed opposite to the magnetic encoder portion, provided near the vehicle inner side of the ABS sensor and rotated by rotation of the inner ring The blower fan generates an air flow in the axial direction of the rotation axis, and the air flow is applied to the disk during braking. Wherein the contacting with the ABS sensor for temperature increase by heating of the rotor.

  With the above configuration, although the temperature of the ABS sensor rises due to the heat generated by the disk rotor during vehicle braking, the air flow from the blower fan is brought into contact with the ABS sensor. Since the temperature increase of the ABS sensor is suppressed, it is possible to provide a sensor-equipped rolling bearing device in which a malfunction due to heat of the ABS sensor is not generated and reliability is improved.

  In order to solve the above-mentioned problems, a drive shaft for transmitting power is connected to the inner ring of the rolling bearing device with sensor of the present invention, and the blower fan is fixed to the outer periphery of the drive shaft, and the drive shaft The air blower is rotated by rotating the air blower, and the air flow generated by the air blower fan is brought into contact with the ABS sensor. In addition to the effect of providing a rolling bearing device with a sensor that is improved in performance, for example, if the drive shaft passes through the attachment port of a vehicle fixing member such as a knuckle and is connected to the inner ring, the drive shaft and the vehicle The external sealing part for sealing the gap between the fixing member mounting port and the blower fan can be integrated, thereby increasing the number of parts. And no, so that the sealing function and cooling function can configure features member complexed.

  In order to solve the above problems, a sealing device for sealing the inside between the inner and outer rings from the outside is provided between the inner ring and the outer ring on the vehicle inner side of the rolling bearing device with sensor of the present invention. The magnetic encoder portion is fixed to an annular slinger that is fixed to the inner ring, which is a part of the sealing device portion, and the slinger is closer to the inner side of the vehicle than the magnetic encoder portion. The blower fan is provided so as to be opposed to the magnetic encoder unit, the ABS sensor is disposed between the blower fan and the magnetic encoder unit, and the blower fan is disposed on the ABS sensor. By contacting the air flow generated by the sensor, it is possible to prevent malfunctions due to the heat of the ABS sensor as described above, In addition to the effect of providing a rolling bearing device with a sensor that is intended to achieve the above, for example, a slinger and a blower fan that are fixed to the inner ring in the sealing device portion can be integrated with each other without increasing the number of components. Thus, a functional member in which the sealing function and the cooling function are combined can be configured.

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 1 is a cross-sectional view of a mounted state of a rolling bearing device with a sensor according to the present invention. In FIG. 1, a rolling bearing device 1 with a sensor is arranged in a plurality of rows interposed between an outer ring 2a as a fixed ring made of bearing steel, an inner ring 2b as a rotating ring, and the inner ring 2b and the outer ring 2a. A rolling bearing 2 composed of a rolling element 2c.

  The inner ring 2b is formed integrally with the hub 3. The hub 3 includes a wheel 3a on the outer side of the vehicle, and a hub bolt 3c for fixing the wheel 3a so as to be connected to the disk rotor 3b of the disk brake device. The hub 3 includes a disk-shaped hub flange 3d protruding outward. Yes. The hub flange 3d is integrally formed on the outer periphery of one end portion (vehicle outer side) of the shaft portion 2b1 constituting the inner ring 2b. A small-diameter portion 2b2 having an outer diameter that is one step smaller is formed at the other end portion (vehicle inner side) of the shaft portion 2b1. The small-diameter portion 2b2 is press-fitted and fixed with an inner ring divided body 2b4 that includes a rolling surface 2b3 that is formed as a separate body and on which one rolling element 2c whose outer peripheral surface is arranged in a plurality of rows rolls. A rolling surface 2b5 on which the other rolling elements 2c arranged in a plurality of rows roll is formed on the outer peripheral surface between one end and the other end of the shaft 2b1. Thus, the inner ring | wheel division body 2b4 is press-fit and integrated with the other end part of the axial part 2b1, and the inner ring | wheel 2b provided with the hub flange 3d in the one end part is comprised.

  The shaft portion 2b1 of the inner ring 2b is formed with a connection insertion hole 2b6 to which a drive shaft 4 as a drive shaft for transmitting power is splined. The drive shaft 4 (also a constant velocity joint) is passed through the coupling insertion hole 2b6 so as to allow power transmission. Then, the shaft end surface 4a of the drive shaft 4 is brought into contact with the inner ring end surface 2b7 on the vehicle inner side of the inner ring divided body 2b4 facing the shaft end surface 4a so that the end of the drive shaft 4 on the extending side is It is fixed by screwing a nut 5 as a screw fastening means.

  Moreover, although this example is the rolling bearing device 1 with a sensor on the driving wheel side that is connected to the drive shaft 4, in the case where the connecting insertion hole 2b6 is not formed in the shaft portion 2b1, the other end side of the shaft portion 2b1 is used. It can be used for a driven wheel by extending it to the outside and fixing it so that it does not come off in the axial direction Z by a crimped portion formed by plastic deformation outward in the radial direction X so that the other end side is crimped. Is possible.

  The sensor-equipped rolling bearing device 1 is connected to an attachment port 6a of a vehicle fixing member 6 such as a knuckle or an axle housing on the vehicle inner side of a suspension device in a vehicle. In this connection, the outer ring 2a of the rolling bearing 2 is inserted and fitted into the mounting opening 6a, and the flange 2a1 protruding outward from the outer ring 2a is fixed to the vehicle via a fastening member 7 such as a bolt and a nut. The member 6 is fixed to the peripheral surface (vehicle outer side) of the attachment port 6a.

  A rotation detection device 8 that detects a change in the rotation of the wheel is attached to the end of the rolling bearing 2 on the inner side of the vehicle. The rotation detection device 8 includes a sealing device portion 9 for sealing the inside of the inner ring 2b and the outer ring 2a of the rolling bearing 2 from the outside, a magnetic encoder portion 10, and a magnetic force generated by the rotation of the magnetic encoder portion 10. The composite structure includes an ABS sensor 11 that detects a change.

  As shown in FIG. 2, the sealing device portion 9 of the rotation detecting device 8 is concentrically arranged on the outer periphery of the inner ring 2b in order to seal the inside between the inner ring 2b and the outer ring 2a of the rolling bearing 2 from the outside. An annular slinger 9a that is pressed by a sheet metal material having a substantially L-shaped section to be fitted, and a sheet metal that has a substantially inverted L-shaped section that is concentrically fitted to the inner periphery of the outer ring 2a. A lip-shaped seal member 9c made of a rubber-like elastic body that is vulcanized and bonded to the core metal 9b and slidably contacts the slinger 9a. The core metal 9b is distributed and fitted to the outer ring 2a and the inner ring 2b. As shown in FIG. 1, another sealing device portion 9d is provided on the outer side of the vehicle, and leakage of grease filled between the rolling elements 2c is regulated by both sealing device portions 9 and 9d. doing.

  As shown in FIGS. 2 and 3, the magnetic encoder unit 10 is formed in an annular shape, and magnetic poles (N pole, S pole) having different polarities are alternately arranged in the circumferential direction Y. The magnetic encoder unit 10 is concentrically fixed to the outer surface (vehicle inner side) of the slinger 9 a of the sealing device unit 9. As a result, the magnetic encoder unit 10 rotates together with the inner ring 2b.

  Next, the ABS sensor 11 that detects a magnetic change due to the rotation of the magnetic encoder unit 10, as shown in FIG. 1, detects the magnetic change due to the rotation of the magnetic encoder unit 10 on the vehicle inner side. Are arranged close to each other. The ABS sensor 11 is inserted into a sensor mounting hole 6b provided in the vehicle fixing member 6, and a sensing portion on the front end side having a detection body (not shown) is disposed to face the magnetic encoder unit 10 so as to face the vehicle. It is fixed to the fixing member 6 or the outer ring 2a. The ABS sensor 11 is molded by resin molding, and examples of the molding material include epoxy resin, phenol resin, and polyamide resin. The signal cable 11a connected from the ABS sensor 11 to the ECU mounted on the vehicle is configured to be drawn out in the radial direction X.

  In addition, an external seal portion 12 as a deflector is provided in order to prevent foreign matter from entering the sealing device portion 9 side of the rotation detecting device 8 from between the drive shaft 4 and the mounting opening 6a of the vehicle fixing member 6. The entire outer seal portion 12 is formed by being pressed into a ring shape by a sheet metal material. That is, as shown in FIGS. 2 and 4, it has a cylindrical portion 12 a concentrically fitted and fixed to the outer periphery 4 b of the drive shaft 4, and is continuous from the vehicle inner side end portion in the axial direction Z of the cylindrical portion 12 a. A body member 12c having a substantially L-shaped cross section is formed by forming an inner wall portion 12b that is bent.

  In the main body member 12c, a labyrinth seal piece 12d that is continuously bent from the end portion in the radial direction X of the inner wall portion 12b toward the vehicle inner side is formed. The labyrinth seal piece 12d has a gap C between the inner peripheral surface 6a1 of the attachment port 6a of the vehicle fixing member 6 (see FIG. 2), and the labyrinth seal function is exhibited by the gap C. As a result, it is possible to prevent the intrusion of foreign matters such as rainwater wound up from the road surface during traveling, sand, and mud containing mud.

  Further, the external seal portion 12 is provided with a function of cooling the ABS sensor 11 that is heated by the heat generated by the disk rotor 3b during braking. Such a cooling structure is provided in the vicinity of the vehicle inner side of the ABS sensor 11 and has a blower fan 12g that rotates in conjunction with the rotation of the inner ring 2b (drive shaft). The blower fan 12g is formed in an annular outer wall portion 12e that is continuously bent from an end portion on the vehicle outer side in the axial direction Z of the cylindrical portion 12a in the main body member 12c of the outer seal portion 12. And the airflow is generated with the ventilation fan 12g formed in the outer side wall part 12e.

  And the ventilation fan 12g provided in the cyclic | annular outer side wall part 12e of the main-body member 12c is provided with the several space | interval piece 12g1 with a predetermined space | interval in the circumferential direction of the outer side wall part 12e, as shown in FIG. . As an example, the blade piece 12g1 may generate an air flow while pushing air in the rotation direction (circumferential direction Y) by the blade surface.

  The specific form is such that a cutting line 12e1 such as a slit formed in the outer wall 12e is continuous in the radial direction X and the circumferential direction Y, and protrudes toward the magnetic encoder unit 10 side using this cutting point. It is formed by bending so that The blower fan 12g formed in this way generates an air flow in the axial direction Z of the rotation axis by the rotation of the drive shaft 4.

  The protruding direction of the blade piece 12g1 in the blower fan 12g according to this example is projected to the magnetic encoder part 10 side on the outer side of the vehicle, but as shown by the one-dot chain line in FIG. It is also possible to project it toward. Further, as shown in FIG. 4, the airflow generated by the rotation direction of the drive shaft 4 generates an airflow (in the direction of the white arrow) that flows toward the vehicle outer side (ABS sensor 11, magnetic encoder unit 10), It is optional whether to generate an air flow (opposite the white arrow) flowing toward the vehicle inner side (labyrinth seal piece 12d) and to be sucked on the vehicle outer side (ABS sensor 11, magnetic encoder unit 10). It is possible to set.

  Further, when the air flow is generated toward the ABS sensor 11, the air blowing fan 12g is disposed in the vicinity of the ABS sensor 11, so that the loss of the air flow generated at each blade piece 12g1 of the air blowing fan 12g is small, and the air flow contact. The cooling efficiency can be increased and the ambient air on the inner side of the vehicle that does not have a heat source can be used, so that the cooling efficiency can be further increased.

  Thus, the external seal portion 12 combines the labyrinth seal function by the labyrinth seal piece 12d and the cooling function by the air flow of the blower fan 12g, and the processing can be integrally formed by pressing with a sheet metal material. This makes it possible to manufacture at a low cost without increasing the amount.

  Next, as another embodiment of the blower fan 12g, the blower fan 12g can be provided in the sealing unit 9 as shown in FIGS. The sealing device portion 9 including the blower fan 12g includes an annular flange portion 9a1 in an annular slinger 9a having a substantially L-shaped cross section fitted to the outer periphery of the inner ring 2b, which is a part of the structure. An extension cylinder that is folded back from the end in the radial direction X to form a two-layer plate, and is continuously bent from the inner end in the radial direction X of the annular flange 9a1 to extend toward the vehicle inner side. A portion 9a2 is formed, and is further continuously bent from the end of the extended tube portion 9a2, and a protruding wall portion 9a3 protruding outward in the radial direction X is formed. The protruding wall portion 9a3 is similar to the above. An air blowing fan 12g is provided.

  Moreover, as other embodiment of the ventilation fan 12g in which the cyclic | annular slinger 9a is integrally provided continuously, as shown to FIG. 7, 8, the cross section fitted by the outer periphery of the inner ring | wheel 2b is substantially L-shaped. The annular blower fan 12g thus formed and the annular slinger 9a having a substantially L-shaped cross section fitted to the blower fan 12g can be configured. The blower fan 12g has a fixed cylinder 12h whose cross section fitted to the outer periphery of the inner ring 2b is substantially L-shaped and whose length in the axial direction Z extends to the outside of the bearing 2, and the fixed cylinder 12h. Is provided with an outer wall portion 12e that is continuously bent from an end portion on the vehicle inner side. And this outer side wall part 12e is provided with the ventilation fan 12g formed similarly to the above-mentioned.

  As described above, the sealing device portion 9 combines a sealing function by the lip-shaped sealing member 9c and a cooling function by the blower fan 12g, and the processing can be integrally formed by pressing with a sheet metal material, thereby reducing the number of parts. Low-cost manufacturing is possible without increasing the number. In addition, the external seal part 12 of this example is formed on a cross-sectional U-shape in order to provide a labyrinth seal function.

  This rolling bearing device 1 with a sensor has an ABS sensor 11, a magnetic sensor, and a magnetic sensor as the surrounding temperature is raised by heat generated in the disk rotor 3 b during braking to reduce the vehicle speed while the vehicle is running. Although the temperature of the encoder unit 10 is also raised, the ABS sensor 11 is provided with the blower fan 12g that generates airflow on the inner ring 2b side or the drive shaft 4 side as the rotating member side on the vehicle inner side. Since the airflow can be brought into direct contact with the magnetic encoder unit 10, a cooling effect by the airflow contact can be obtained, and cooling can be performed to a desired temperature.

Sectional drawing of the attachment state of the rolling bearing apparatus with a sensor which concerns on this invention. The partial expanded sectional view of the rotation detection apparatus of FIG. The figure which shows a magnetic encoder part. The figure which shows arrangement | positioning of a cooling unit and an ABS sensor. Sectional drawing of the attachment state of another rolling bearing apparatus with a sensor. The figure which shows arrangement | positioning of a cooling unit and an ABS sensor. Sectional drawing of the attachment state of another rolling bearing apparatus with a sensor. The figure which shows arrangement | positioning of a cooling unit and an ABS sensor.

Explanation of symbols

2a Outer ring 2b Inner ring 3a Wheel 3b Disk rotor 4 Drive shaft (drive shaft)
6 Vehicle fixing member 9 Sealing device part 9a Slinger 10 Magnetic encoder part 11 ABS sensor 12g Blower fan 12g1 Blade piece

Claims (2)

An outer ring connected to a vehicle fixing member on the inner side of the vehicle, an inner ring connected to a disk rotor and a wheel on the outer side of the vehicle and rotating relative to the outer ring, and fixed to the inner side of the inner ring on the vehicle inner side, and magnetic characteristics in the circumferential direction An annular magnetic encoder unit that alternately changes, and an ABS sensor that is fixed to the vehicle fixing member or the outer ring and is opposed to the magnetic encoder unit so as to detect a magnetic change due to rotation of the magnetic encoder unit. A rolling bearing device with a sensor comprising:
The blower fan is provided near the vehicle inner side of the ABS sensor and rotates by rotation of the inner ring. The blower fan generates an air flow in the axial direction of the rotation axis, and this air flow is Contact the ABS sensor, which is heated by the heat generated by the disk rotor ,
A drive shaft that transmits power is connected to the inner ring, the blower fan is fixed to the outer periphery of the drive shaft, and the blower fan is rotated by rotation of the drive shaft, and the airflow generated by the blower fan sensor-equipped rolling bearing apparatus according to claim Rukoto into contact with the ABS sensor a. An outer ring connected to a vehicle fixing member on the inner side of the vehicle, an inner ring connected to a disk rotor and a wheel on the outer side of the vehicle and rotating relative to the outer ring, and fixed to the inner side of the inner ring on the vehicle inner side, and magnetic characteristics in the circumferential direction An annular magnetic encoder unit that alternately changes, and an ABS sensor that is fixed to the vehicle fixing member or the outer ring and is opposed to the magnetic encoder unit so as to detect a magnetic change due to rotation of the magnetic encoder unit. A rolling bearing device with a sensor comprising:
The blower fan is provided near the vehicle inner side of the ABS sensor and rotates by rotation of the inner ring. The blower fan generates an air flow in the axial direction of the rotation axis, and this air flow is Contact the ABS sensor, which is heated by the heat generated by the disk rotor,
Between the inner ring and the outer ring on the vehicle inner side, a sealing device part for sealing the inside between the inner and outer rings from the outside is provided, and the inner ring that is a part of the sealing device part The magnetic encoder portion is fixed to an annular slinger fixed to
The slinger is provided on the inner side of the vehicle with respect to the magnetic encoder unit, and is provided with the blower fan so as to be opposed to the magnetic encoder unit. Between the blower fan and the magnetic encoder unit, the slinger is provided. the ABS sensor is disposed, wherein the to Rousset Nsa rolling bearing device Rukoto contacting the gas stream to be generated by the blowing fan to the ABS sensor.

Images