JP2008032230A - Bearing device with sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device with a sensor, wherein the sensor can be securely fixed thereto with no rattling, a sensor casing encasing the sensor can be made stronger and lighter, and the sensor can be mounted in a desired space. <P>SOLUTION: The bearing device 10 with the sensor comprises a seal case 23 mounted on an outer ring 15 of a bearing 13, a seal means 30 provided in the seal case 23, the sensor 27 for detecting the operated condition of the bearing device 10, and a female screw member 28 for fixing the sensor 27. The female screw member 28 is arranged between the seal case 23 and the seal means 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sensor-equipped bearing device, and more particularly, to a sensor-equipped bearing device used for detection of an operating state of a bearing device incorporated in a moving body such as a mechanical device or a railway vehicle, an automobile, a transport vehicle, or preventive maintenance.

  As an example of a conventional sensor-equipped bearing device, a sensor-equipped bearing device is known in which a bolt is screwed to an attachment hole formed on an outer peripheral surface of a seal member to fix the sensor (for example, see Patent Document 1).

  As shown in FIG. 7, in the sensor-equipped bearing device 150 disclosed in Patent Document 1, an inner ring 152 is press-fitted into an axle 151, and tapered rollers 154 are rotatably arranged between the inner ring 152 and the outer ring 153. . An oil seal 155 is attached to both sides of the outer ring 153.

  The oil seal 155 has a seal case 156 fitted to the inner diameter surface of the end portion of the outer ring 153, and core bars 157 and 158 are attached to the inner peripheral surface thereof. A lip packing 159 is attached to the tip of the cored bar 158, and the lip 160 is in contact with the inner surface of the seal fitting 161 fitted on the end of the inner ring 152.

  The seal case 156 of the oil seal 155 and the core bars 157 and 158 are provided with fitting holes for the sensor 162 so that the cylindrical flange 163 does not protrude from the mounting portion 164 of the sensor 162. Around the hole, it is formed toward the outside of the seal case 156 by burring. A female screw is processed on the inner peripheral surface of the flange 163.

  In the sensor-equipped bearing device 150, the sensor 162 is fixed to the seal case 156 by fitting the sensor 162 into the fitting holes of the core bars 157 and 158 and then screwing the bolt 165 into the female screw of the flange 163. The sensor 162 outputs a detection signal to the outside through the lead wire 166.

  As another example of a conventional sensor-equipped bearing device, a sensor-equipped bearing device in which a sensor is fixed to a sealing insert is known (for example, see Patent Document 2).

  As shown in FIG. 8, the sensor-equipped bearing device 170 disclosed in Patent Document 2 has a sealing insert 171 pressed against a bearing ring (not shown) of a bearing (not shown). A sensor main body 172 including an accelerometer device and a sensor main body 173 incorporating a motion sensor and a rotation sensor are mounted at different positions. The sensor main bodies 172 and 173 are connected to a multi-pin connector 176 mounted on the housing 175 through a cable 174.

In the sensor-equipped bearing device 170, the sensors 172 and 173 are disposed within the bearing load range, and in one sensor 172, an accelerometer that measures vibration in a direction perpendicular to the rotation axis, and the axial direction of the rotation axis And an accelerometer for measuring the vibration of the.
JP 2003-056557 A (page 3-4, FIG. 3) Japanese translation of PCT publication No. 2002-542773 (page 6-8, FIG. 1)

  By the way, in the said patent document 1, since the sealing case 156 was press-processed and the soft iron was used for the material, there existed a problem that the intensity | strength of an internal thread was low. Therefore, the fastening strength of the screw fastening portion is low, and when a large vibration / impact such as an axle bearing of a railway vehicle is applied, there is a problem that the screw fastening portion is loosened and the sensor 162 is rattled.

  Moreover, in the said patent document 2, the sensor 172 is arrange | positioned so that the vibration perpendicular | vertical to the rotating shaft of a bearing can be measured. Therefore, in order to detect both the abnormality of the axle such as the axle flat and the abnormality of the bearing such as the peeling of the bearing, it is necessary to dispose the sensor 172 on the upper part of the bearing, but the carriage is covered on the upper part of the bearing. There is a problem that it is difficult to secure a sufficient space for mounting the sensor, and that mounting is difficult.

  The present invention has been made in view of the above circumstances, and its purpose is to securely fix the sensor without rattling, to make the sensor housing containing the sensor strong and light, and to provide a sensor desired. The object is to provide a sensor-equipped bearing device that can be mounted in a space.

The above object of the present invention is achieved by the following configurations.
(1) A seal case attached to the outer ring of the bearing, seal means provided in the seal case, a sensor for detecting the operating state of the bearing device, and a female screw member for fixing the sensor A bearing device with a sensor,
A bearing device with a sensor, wherein the female screw member is disposed between the seal case and the seal means.
(2) The sensor-equipped bearing device according to (1), wherein at least one female screw is processed in the female screw member.
(3) The sensor is fixed to the seal case,
The bearing apparatus with a sensor according to (1) or (2), wherein the female screw member is disposed between the seal case and the seal means in the axial direction.
(4) The sensor-equipped bearing device according to (1), wherein the sensor includes at least one of a speed detection element, a temperature detection element, and an acceleration detection element.
(5) The sensor-equipped bearing device according to any one of (1) to (4), wherein the sensor-equipped bearing device is a railcar-equipped sensor-equipped bearing device.
(6) A sensor-equipped bearing device comprising: at least one detection element that detects an operating state of the bearing device; and a sensor housing that contains the detection element,
The sensor housing is made of an aluminum alloy.
(7) The sensor casing is attached to a bearing component,
(6) The sensor-equipped bearing device according to (6), wherein a gap in a mounting surface between the sensor casing and the bearing component is filled with resin.
(8) The sensor-equipped bearing device according to (6) or (7), wherein the aluminum alloy is surface-treated.
(9) The sensor-equipped bearing device according to any one of (6) to (8), wherein the sensor casing is attached to a bearing seal member.
(10) The sensor-equipped bearing device according to any one of (6) to (9), wherein the detection element includes at least one of a speed detection element, a temperature detection element, and a vibration detection element.
(11) A sensor-equipped bearing device including a sensor having a vibration detection element that detects vibration of the bearing device,
A sensor-equipped bearing device, wherein the vibration detection element detects only vibration in an axial direction.
(12) The sensor-equipped bearing device according to (11), wherein the sensor further includes at least one of a speed detection element and a temperature detection element.
(13) The bearing device includes a sealing unit for preventing foreign matter from entering the bearing, and the sealing unit is a labyrinth seal. Bearing device with sensor.
(14) The sensor-equipped bearing device according to any one of (6) to (13), wherein the sensor-equipped bearing device is a railcar-equipped sensor-equipped bearing device.

  According to the sensor-equipped bearing device of the present invention, the sensor is fixed via the female screw member disposed between the seal case and the seal means. Therefore, even if the screw fastening is loosened, the female screw member does not enter the bearing by the sealing means, and damage to the bearing can be prevented. Further, since the female screw member is provided separately from the seal case and the seal case is sandwiched between the female screw member and the sensor, the sensor can be securely fixed without causing loosening of the screw fastening.

  Moreover, according to the bearing apparatus with a sensor of this invention, the sensor housing | casing which includes a detection element consists of aluminum alloys. Therefore, the sensor casing made of an aluminum alloy is stronger than that made of plastic and lighter than that made of iron, and the burden on bearing components to which the sensor casing is attached is reduced. In addition, the bearing temperature can be accurately measured due to the good thermal conductivity.

  Further, according to the sensor-equipped bearing device of the present invention, since the vibration detecting element measures only the vibration in the axial direction, it is possible to accurately measure abnormal vibration such as peeling of the bearing, and also to prevent uneven wear of the axle. Can be measured. Moreover, since the vibration in the axial direction is measured, the mounting position (phase) of the sensor can be arranged at any place on the circumference.

  Hereinafter, a bearing device with a sensor concerning each embodiment of the present invention is explained in detail based on a drawing.

(First embodiment)
FIG. 1 is a sectional view showing a bearing device with a sensor according to a first embodiment of the present invention. FIG. 2 is a side view of a seal case in the sensor-equipped bearing device of the first embodiment.

  As shown in FIG. 1, a bearing device 10 with a sensor according to a first embodiment of the present invention is a bearing device with a sensor for a railway vehicle, and a bearing box 12 with an axle 11 supporting and fixing a wheel (not shown). Is supported rotatably by a double row tapered roller bearing 13 having a contact angle which is a bearing of the present invention.

  The double row tapered roller bearing 13 is loaded with a radial load due to the weight of various members and an arbitrary axial load. The double row tapered roller bearing 13 is fitted into the bearing housing 12 and has a single outer ring 15 having a pair of outer ring raceway surfaces 14 (one outer ring raceway surface is not shown) inclined on the outer circumferential surface of the cone. And an inner ring raceway surface 16 (one inner ring raceway surface is not shown) that is externally fitted to the axle 11 and inclined in a conical outer surface shape, and has a pair of inner rings 17 (one inner ring is not shown). .

  The double row tapered roller bearing 13 holds a plurality of tapered rollers 18 arranged in a double row between the outer ring raceway surface 14 of the outer ring 15 and the inner ring raceway surface 16 of the inner ring 17, and the tapered rollers 18 in a freely rolling manner. And an annular retainer 19 (one retainer is not shown). Inside the double row tapered roller bearing 13, a lubricant such as grease or oil is sealed.

  An inner ring spacer 20 is disposed between the pair of inner rings 17, and an inner ring spacer 21 is also disposed at an axial end of the inner ring 17. An annular speed detecting gear member 22 for constituting a part of the sensor is screwed and fixed to the axle 11 at the end of the inner ring spacer 21.

  A seal case 23 is assembled to the end of the outer ring 15. The seal case 23 is formed thin by pressing soft iron, and is formed in a cylindrical shape so that the outer diameter decreases in two steps from the outer ring 15 side toward the inner ring spacer 21. One end portion of the seal case 23 disposed on the outer ring 15 side is locked to a stepped portion 24 formed on the inner diameter surface of the outer ring 15, and the flange portion 25 disposed on the inner ring spacer 21 side has a radial direction. It extends and faces the inner ring spacer 21 in a non-contact manner.

  In the seal case 23, two flange side insertion holes 26 (one flange side insertion hole is not shown) are formed at a substantially central portion in the radial direction of the flange portion 25. On the tapered roller bearing 13 side of the flange portion 25 extending in the axial direction from the flange-side insertion hole 26, a pair of female screw members 28 and 28 for fixing the sensor 27 are arranged apart in the circumferential direction (see FIG. 2). The female screw members 28 and 28 are formed in a hexagonal nut shape, and are provided with female screws 29 and 29 communicating with the flange side insertion hole 26 at the center, respectively. That is, the female screw members 28 and 28 are disposed between the seal case 23 and the oil seal 30 which is the sealing means of the present invention contained in the seal case 23 in the axial direction. The female screw members 28, 28 are made of a material having higher strength than the seal case 23. In addition, you may fix the internal thread members 28 and 28 to the flange part 25 by joining means, such as adhesion | attachment and welding, for example.

  The oil seal 30 includes a partition plate member 31 and a seal member 32. The partition plate member 31 is a thin metal member having an L-shaped cross section, and is fitted to the inner diameter portion of the intermediate portion of the seal case 13. In the seal member 32, a resin member 36 having a main lip 34 and a dust lip 35 is integrally formed on a metal core 33 and is fitted to the inner diameter portion of the partition plate member 31. A garter spring 37 for urging the main lip 34 toward the inner peripheral side is attached to the outer peripheral portion of the main lip 34. The main lip 34 and the dust lip 35 are in sliding contact with the outer peripheral surface of the inner ring spacer 21 such that the main lip 34 is disposed on the tapered roller bearing 13 side and the dust lip 35 is disposed on the speed detecting gear member 22 side. Thus, foreign matter can be prevented from entering the tapered roller bearing 13 and the lubricant can be prevented from leaking out of the bearing.

  The sensor 27 includes a speed detection element, a temperature detection element, and an acceleration detection element (vibration detection element), and detects the operation state of the sensor-equipped bearing device 10 with high accuracy. The speed detection element is disposed so as to face the speed detection gear member 22 in a non-contact manner, and by detecting the rotation of the speed detection gear member 22 fixed to the axle 11, the rotation of the axle 11 is measured, For example, a pulsed electric signal is generated. The generated electrical signal is sent to a control circuit (not shown) and monitored. The temperature detecting element constantly measures the ambient temperature in the vicinity of the tapered roller 18, the outer ring 15, and the inner ring 16 and gives it to the control circuit, thereby preventing the occurrence of seizure due to running out of the lubricant. The acceleration detecting element converts vibration components applied to the tapered roller 18, the outer ring 15 and the inner ring 16 into an electric signal and sends it to the control circuit, so that abnormalities such as peeling of the bearing and scratches, uneven wear of the wheel, etc. Perform detection. The acceleration detecting element may detect vibration components in the axial direction and the radial direction of the axle 11, but in a bearing having a contact angle as in the present invention, it is preferable to detect axial vibration. In addition, although the structure inside the sensor 27 is not shown in figure, the structure inside the sensor of 5th Embodiment mentioned later may be applied.

  A sensor side insertion hole 39 (one sensor side insertion hole is not shown) corresponding to the flange side insertion hole 26 and the female screws 29 and 29 of the female screw members 28 and 28 is formed in the base 38 of the sensor 27. ing. The sensor 27 is fixed to the seal case 23 by inserting a bolt 40 from the sensor side insertion hole 39 of the base 38 through the flange side insertion hole 26 and screwing into the female screws 29 and 29 of the female screw members 28 and 28. .

  When the sensor 27 is fixed as described above, the female screw members 28 and 28 are disposed between the flange portion 25 of the seal case 23 and the oil seal 30 in the axial direction. Even if the bolts 40, 40 and the female screw members 28, 28 are loosened by acting on the bearing device 10, the female screw members 28, 28 may enter the tapered roller bearing 13 due to the oil seal 30. In addition, damage to the tapered roller bearing 13 can be prevented.

  The female screw members 28 and 28 are made of a material having high strength and are formed separately from the seal case 23. The female screw members 28 and 28 and the sensor 27 sandwich the flange portion 25 of the seal case 23. The sensor 27 can be securely fixed without causing looseness.

  According to the sensor-equipped bearing device 10 of the first embodiment, the sensor 27 is fixed to the seal case 23 via the female screw members 28 and 28 disposed between the seal case 23 and the oil seal 30 in the axial direction. Therefore, even if the screw fastening is loosened, the female screw members 28 and 28 do not enter the tapered roller bearing 13 by the oil seal 30, so that the tapered roller bearing 13 can be prevented from being damaged. Further, since the female screw members 28 and 28 are provided separately from the seal case 23 and the flange portion 25 of the seal case 23 is sandwiched between the female screw members 28 and 28 and the sensor 27, the sensor does not loosen the screw. 27 can be securely fixed.

  Further, since the female screw members 28 and 28 are processed with at least one female screw 29 and 29, the sensor 27 is fastened with a screw part such as a bolt 40, so that there is no rattling. Fixing can be performed.

(Second Embodiment)
Next, the sensor-equipped bearing device of the second embodiment will be described with reference to FIG. FIG. 3 is a side view of a seal case used in the sensor-equipped bearing device of the second embodiment. Note that the same or equivalent parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  As shown in FIG. 3, a pair of female screw members 52, 52 are arranged on the flange portion 25 in the seal case 51 used in the sensor-equipped bearing device 50 of the second embodiment. The female screw members 52 and 52 have female screws 53 and 53, respectively, and are formed in a square plate shape, and the corners of the female screw members 52 and 52 are in contact with the inner peripheral surface of the seal case 23. It is fixed so that it does not rotate inside. The shape of the female screw members 52, 52 is not limited to a square shape, and may be a circular arc shape or an elliptical plate shape.

Accordingly, since the female screw members 52 and 52 do not rotate within the seal case 23, it is possible to prevent the screw fastening with the bolt 40 from being loosened.
Other configurations and operations are the same as those in the first embodiment.

(Third embodiment)
Next, a sensor-equipped bearing device according to a third embodiment will be described with reference to FIG. FIG. 4 is a side view of a seal case used in the sensor-equipped bearing device of the third embodiment. Note that the same or equivalent parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  As shown in FIG. 4, a pair of female screw members 62 and 62 are fixed to the flange portion 25 in the seal case 61 used in the sensor-equipped bearing device 60 of the third embodiment. The female screw members 62, 62 each have a first female screw 63 and a second female screw 64, and are formed in an arcuate plate shape. The first female screw 63 is used for fixing the sensor, and the second female screw 64 is used for fixing the female screw member 62 to the seal case 61. That is, after fixing the female screw member 62 to the flange portion 25 of the seal case 61 by screwing a bolt or a screw through the second female screw 64, the sensor 27 (see FIG. 1) through the first female screw 63. Is fixed to the flange portion 25.

  Accordingly, since the female screw member 62 has two female screws 63 and 64, the female screw member 62 is fixed to the seal case 61 at two locations, and the rotation of the female screw member 62 can be prevented. It is possible to prevent the fastening from loosening. Even if the sensor 27 is removed, the female screw member 62 is attached to the seal case 23 by the bolt 40 inserted into the second female screw 64, so that the female screw members 62, 62 can be prevented from falling, and workability is improved. Can be achieved.

(Fourth embodiment)
Next, a sensor-equipped bearing device according to a fourth embodiment will be described with reference to FIG. FIG. 5 is a side view of a seal case used in the sensor-equipped bearing device of the fourth embodiment. Note that the same or equivalent parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  As shown in FIG. 5, a seal case 71 used in the sensor-equipped bearing device 70 of the fourth embodiment includes four female screws 73, 73, and a single female screw member 72 formed in an arcuate plate shape. 73 and 73 are processed. Of the four female screws 73, 73, 73, 73, the outer two female screws 73, 73 are used to screw in bolts and screws to attach the female screw member 72 to the flange portion 25, and the inner two screws The sensor 27 (see FIG. 1) is fixed to the flange portion 25 using the female screws 73 and 73.

Therefore, since the female screw member 72 has four female screws 73, 73, 73, 73, the female screw member 72 is fixed to the seal case 71 at four locations, and the rotation of the female screw member 72 can be prevented. It is possible to prevent the screw fastening with 40 from being loosened. Further, since the female screw member 72 has a single structure, the material yield is good, and the female screw member 62 is attached to the seal case 23 by the two bolts 40 inserted into the second female screw 64 even when the sensor 27 is removed. The female screw members 62, 62 can be prevented from falling, and workability can be improved.
Other configurations and functions are the same as those in the first embodiment.

(Fifth embodiment)
Next, a sensor-equipped bearing device according to a fifth embodiment will be described with reference to FIG. FIG. 6 is a cross-sectional view of the sensor-equipped bearing device of the fifth embodiment. Note that the same or equivalent parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  As shown in FIG. 6, the sensor-equipped bearing device 80 according to the fifth embodiment is a bearing device with a sensor for railway vehicles, and the axle 11 supports and fixes a wheel (not shown) on the inner diameter side of the bearing housing 12. The double row tapered roller bearing 13 is rotatably supported.

  The double row tapered roller bearing 13 has a single outer ring 15, a pair of inner rings 17, a tapered roller 18, a punching cage 19, and inner ring spacers 20 and 21, as in the first embodiment. The outer ring 15 is prevented from rotating by a locking screw member 81 screwed into the bearing housing 12. The non-rotating screw member 81 is provided in the outer ring 15 and is inserted into the bearing housing 12 by being screwed into the blind hole 82. The tip of the locking screw member 81 has a smaller diameter (tapered) than the threaded portion of the locking screw member 81 and eliminates the thread, so that even if the outer ring 15 rotates due to creep or the like, the thread may be crushed. No.

  Further, an iron seal member 83 which is a bearing component is assembled to the end of the outer ring 15. The seal member 83 is formed with a seal plate portion 85 bent at approximately 90 degrees with respect to the flange portion 84 at the distal end portion of the flange portion 84 extending radially inward. Further, a seal recess 86 formed so as to surround the seal plate portion 85 with a predetermined gap is provided on the outer peripheral surface of the inner ring spacer 21 provided at the shaft end portion of the inner ring 17. Therefore, the seal member 83 having the seal plate portion 85 and the inner ring spacer 21 having the seal recess 86 constitute a labyrinth seal 87 which is a seal means for preventing foreign matter from entering the tapered roller bearing 13.

  The seal member 83 has a flange-side insertion hole 88 (one flange-side insertion hole not shown) formed in the flange portion 84, and the tapered roller bearing 13 of the flange portion 84 extending in the axial direction from the flange-side insertion hole 88. A pair of female screw members 90 (one female screw member is not shown) for fixing the sensor 89 are arranged on the side. The female screw member 90 is formed with a female screw 91 (one female screw is not shown) communicating with the flange-side insertion hole 88.

  A sensor housing 92 is fixed to the flange portion 84 of the seal member 83. The sensor housing 92 has a sensor hole 94 formed in the bottom 93 and is sealed with a cover 95. In the sensor housing 92, a sensor-side insertion hole 97 communicating with the flange-side insertion hole 88 and the female screw 91 of the female screw member 90 is formed in the side plate 96 on the flange portion 84 side of the seal member 83.

  The sensor housing 92 is made of an aluminum alloy obtained by anodizing aluminum alloys such as A2017, A2024, A5056, A6061, and A7075. The sensor housing 92 made of aluminum alloy is superior in mechanical strength to that made of plastic, and is lighter than that made of iron, so that a burden is placed on the seal member 83 to which the sensor housing 92 is attached. Even if an external impact is applied without being applied, the seal member 83 is unlikely to be detached from the outer ring 15, and the mechanical reliability of the seal member 83 can be improved.

  In addition, since the sensor housing 92 is lightweight, a decrease in the natural frequency of the seal member 83 can be reduced. Thereby, the fluctuation | variation from the natural frequency in the sealing member 83 single-piece | unit decreases, and the vibration state of the tapered roller bearing 13 can be measured accurately. Furthermore, since the aluminum alloy sensor housing 92 has a better thermal conductivity than a plastic housing, the bearing temperature can be accurately measured. Further, since the sensor housing 92 is subjected to a surface treatment such as an alumite treatment on an aluminum alloy, the corrosion resistance of aluminum can be further improved. The surface treatment may be a normal plating treatment other than the alumite treatment, but the surface treatment using an anodic oxidation treatment such as alumite treatment has better coating properties.

  A gap between the sensor housing 92 and the flange portion 84 is filled with a resin 98 such as silicon resin or epoxy resin. That is, the resin 98 is filled in the gap portion of the attachment surface between the iron seal member 83 and the aluminum alloy sensor housing 92, so that moisture does not enter the gap portion of the attachment portion, and aluminum and iron Elution of the aluminum alloy based on the difference in reference potential does not occur. As a result, the durability of the sensor 89 can be enhanced.

  A bolt 99 (one bolt is not shown) is inserted into the sensor housing 92 from the sensor side insertion hole 97 of the side plate 96 through the flange side insertion hole 88, and is screwed into the female screw 91 of the female screw member 90. The sensor housing 92 is fixed to the seal member 83 so that the flange portion 84 of the seal member 83 is sandwiched between the member 90 and the sensor housing 92. The female screw member 90 of this embodiment may be any of the female screw members 28, 52, 62, and 72 of the first to fourth embodiments.

  In the sensor housing 92, the speed detection element 100, the temperature detection element 101, and the vibration detection element 102 are fixed to the substrate 103.

  The speed detection element 100 is arranged in the sensor hole 94 of the sensor housing 92 so as not to contact the speed detection gear member 22, and detects the rotation of the speed detection gear member 22 fixed to the axle 11. Thus, the rotation of the axle 11 is measured, for example, a pulsed electric signal is generated, and the generated electric signal is monitored by a control circuit. When measuring the rotation direction, two speed detection elements 100 may be arranged in a position where the speed signal pulse is about 90 degrees in one sensor housing 92. Further, the same effect can be obtained even if two sensor casings each having one speed detecting element 100 are attached. At this time, it is preferable to arrange the two sensor housings so that the pulse of the speed signal is about 90 degrees in phase as in the above-described configuration.

  In addition, when the purpose of use is only to measure the rotational speed, and it is necessary to measure the rotational direction of only some of the bearings, only a sensor housing having one speed detecting element 100 is manufactured. It is possible to measure the rotational speed and direction by attaching two sensor housings only to the bearings that require measurement in the rotational direction. By doing so, it is not necessary to increase the types of sensors to be manufactured, and cost reduction can be realized.

  The temperature detection element 101 is arranged on the seal member 83 side near the tapered roller bearing 13 of the sensor housing 92, and constantly controls and controls the ambient temperature inside the tapered roller bearing transmitted through the seal member 83. Give to the circuit. At this time, since the labyrinth seal which is a non-contact seal is used as the sealing means, there is no heat generation, and the heat generation of the tapered roller bearing 13 can be accurately measured. In addition, since the sensor housing 92 is made of an aluminum alloy and the temperature detection element 101 is arranged closer to the seal member than the other detection elements, the temperature of the seal member 83 can be measured more accurately. Further, if a silicon resin or the like having good thermal conductivity is filled between the sensor casing 92 and the flange portion 84, the temperature can be measured with higher accuracy.

  The vibration detection element 102 is a sensor that detects vibration in the axial direction, converts the vibration component applied to the tapered roller 18, the outer ring 15, and the inner ring 17 into an electric signal and sends it to the control circuit. Since the vibration detection element 102 measures only the vibration in the axial direction, it can accurately measure abnormal vibration such as peeling of the tapered roller bearing 13 and can also measure the uneven wear of the axle 11 with high accuracy. Further, the attachment position (phase) can be set at any place on the circumference.

  When measuring vibration in the radial direction to detect a bearing abnormality such as peeling, the vibration due to peeling cannot be measured accurately unless the vibration detecting element is arranged in the immediate vicinity of the site where the abnormality has occurred. For this reason, when detecting vibration in the radial direction, it is necessary to arrange a vibration detecting element in the vicinity of the load zone where separation is most likely to occur. However, in the case of an axle bearing for a railway vehicle, since the load zone is on the upper side (the carriage side) of the bearing, the carriage or the like may be an obstacle, and there may be no space for the sensor. Further, when an abnormality such as peeling occurred at a site away from the place where the vibration detecting element was attached, the abnormal vibration could not be measured accurately. On the other hand, in the case of the present invention, in a bearing having a contact angle, an axial vibration component generated as a component of the contact angle with the occurrence of radial vibration is measured. This axial component is almost equal to the radial direction vibration at any part in the circumferential direction, so abnormal vibration is detected regardless of where the vibration detection element is placed. Can be accurately detected. Further, even if an abnormality such as peeling occurs in the bearing, the abnormal vibration can be accurately measured.

  That is, since the tapered roller bearing 13 has a contact angle, when a radial vibration occurs, an axial vibration is generated by a component of the contact angle. Since this axial vibration has substantially the same value in the entire surface in the circumferential direction, the taper roller bearing 13 can be peeled off or the axle 11 can be removed regardless of the circumferential position of the end surface of the outer ring 15. The flat can be measured accurately. In addition, the same effect can be acquired also with the combination ball bearing which gave the preload instead of the tapered roller bearing 13. FIG.

  Note that a cable (not shown) is drawn from the sensor casing 92 to transmit the measurement signals output from the speed detection element 100, the temperature detection element 101, and the vibration detection element 102 to the outside. Since the outer ring 15 is prevented from creeping, the cable is not broken and the reliability of the sensor-equipped bearing device 80 can be improved.

  According to the sensor-equipped bearing device 80 of the fifth embodiment, the sensor housing 92 including the speed detection element 100, the temperature detection element 101, and the vibration detection element 102 is made of an aluminum alloy. Therefore, the sensor casing 92 made of an aluminum alloy is stronger than the plastic casing and lighter than the iron casing, and the burden on the seal member 83 to which the sensor casing 92 is attached is reduced. In addition, the bearing temperature can be accurately measured due to the good thermal conductivity. Further, since the sensor housing 92 is attached to the seal member 83 of the tapered roller bearing 13, measurement can be performed at a position close to the bearing atmosphere, and real-time monitoring can be performed.

  Further, since the sensor housing 92 is attached to the seal member 83 and the resin 98 is filled in the gap between the mounting surfaces between the sensor housing 92 and the seal member 83, moisture enters the gap portion of the attachment portion. Without the elution of the aluminum alloy based on the difference between the reference potentials of aluminum and iron, the durability of the sensor 89 can be improved. In addition, since the aluminum alloy is subjected to a surface treatment such as alumite treatment, the corrosion resistance of aluminum can be further enhanced. Although surface treatment such as alumite treatment alone has an anticorrosive effect, it is more preferable to fill the gap with a resin because moisture does not enter.

  Further, since the vibration detecting element 102 measures only the vibration in the axial direction, it is possible to accurately measure abnormal vibration such as peeling of the tapered roller bearing 13 and also to measure uneven wear of the axle 11 with high accuracy. Further, since the vibration in the axial direction is measured, the mounting position (phase) of the sensor 89 can be arranged at any place on the circumference. That is, when measuring vibration in the radial direction, it is difficult to detect the abnormality when peeling or the like occurs in a part away from the vibration detecting element, but the vibration in the axial direction is It is almost the same at every position.

  Further, the bearing device 80 includes seal means 87 for preventing foreign matter from entering the inside of the bearing. Since the seal means 87 is a labyrinth seal, there is no heat generation during the measurement by the temperature detecting element 101, and the tapered roller bearing 13 is used. Can be accurately measured.

In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, the bearing is not limited to a double-row tapered roller bearing, and other various rolling bearings such as a double-row deep groove ball bearing, an angular ball bearing, and a cylindrical roller bearing may be applied.
In addition, the detection element incorporated in the sensor is not particularly limited, and includes at least one of a speed detection element, a temperature detection element, and an acceleration detection element in order to monitor the operation status of the bearing device with high accuracy. desirable.

It is sectional drawing which shows the bearing apparatus with a sensor of 1st Embodiment which concerns on this invention. It is a side view of the seal case in the bearing apparatus with a sensor shown in FIG. It is a side view of the seal case in the bearing device with a sensor of a 2nd embodiment. It is a side view of the seal case in the bearing device with a sensor of a 3rd embodiment. It is a side view of the seal case in the bearing device with a sensor of a 4th embodiment. It is sectional drawing which shows the bearing apparatus with a sensor of 5th Embodiment which concerns on this invention. It is sectional drawing of the conventional bearing apparatus with a sensor. It is an external view of the conventional bearing apparatus with a sensor different from FIG.

Explanation of symbols

10, 50, 60, 70, 80 Bearing device with sensor 13 Tapered roller bearing (bearing)
15 Outer ring 23, 51, 61, 71 Seal case 27, 89 Sensor 28, 52, 62, 72, 95 Female thread member 29, 53, 73, 96 Female thread 30 Oil seal (sealing means)
63, 64 First female screw, second female screw (female screw)
83 Seal members (bearing components)
87 Labyrinth seal (sealing means)
92 Sensor housing 98 Resin 100 Speed detection element 101 Temperature detection element 102 Vibration detection element (acceleration detection element)

Claims (6)

A sensor-equipped bearing device comprising: at least one detection element that detects an operating state of the bearing device; and a sensor housing that includes the detection element, wherein the sensor housing is attached to a bearing component made of iron,
The sensor casing is made of a surface-treated aluminum alloy,
A sensor-equipped bearing device, wherein a gap in a mounting surface between the sensor casing and the bearing component is filled with resin.   The sensor-equipped bearing device according to claim 1, wherein the surface treatment is a surface treatment using anodization.   The bearing device with a sensor according to claim 1, wherein the bearing component is a seal member.   4. The sensor-equipped bearing device according to claim 3, wherein the sealing means including the seal member is a labyrinth seal.   The sensor-equipped bearing device according to claim 1, wherein the resin is a silicon resin or an epoxy resin.   The sensor-equipped bearing apparatus according to claim 1, wherein the detection element includes at least one of a speed detection element, a temperature detection element, and a vibration detection element.

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