JP2008175275A - Wheel bearing with sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing with a sensor, allowing a load detecting sensor to be compactly installed on a vehicle, detecting the load on a wheel in a well sensitive manner, and achieving lower cost in mass production. <P>SOLUTION: The wheel bearing having double-row rolling elements laid between an outward member and an inward member comprises the distortion sensor 21 mounted on the fixed side member out of the outward member and the inward member. For example, the fixed side member is the outward member. The distortion sensor 21 consists of a distortion generating member 22 fixed to the outward member and a sensor element 23 mounted on the distortion generating member 22 for measuring the distortion of the distortion generating member. The distortion generating member 22 has contact fixed portions 22a, 22b at two positions on the outward member. The first contact fixed portion 22a out of the contact fixed portions is fixed to the flange face of the outward member, and the second contact fixed portion 22b is fixed to the peripheral face of the outward member. The distortion generating member 22 has a portion 22f located around a position where the sensor element 23 is mounted, and shaped locally narrower or thinner. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  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.

  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 performed 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.

  Therefore, it is conceivable to control the posture 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. In addition, even when the load is uneven, the load applied to each wheel is uneven. For this reason, if the load applied to the wheel can be detected at any time, the suspension control etc. is controlled in advance based on the detection result, thereby controlling the attitude 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.

  In addition, when steer-by-wire is introduced in the future and the system becomes a system in which 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.

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

  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.

  Accordingly, it has been considered to provide a strain generating member fixed to the outer ring, and to attach a strain measuring sensor element to the strain generating member. With this configuration, the strain generating member to which the sensor element is attached may be fixed to the outer ring, and productivity is improved. However, it has been insufficient to detect the distortion of the outer ring with high sensitivity.

  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.

  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 double row rolling element interposed between both rolling surfaces, and a sealing device that seals an end between the outer member and the inner member, and rotatably supports the wheel with respect to the vehicle body. In a wheel bearing, a strain sensor comprising a strain generating member fixed to a fixed side member of the outer member and the inner member, and a strain measuring sensor element attached to the strain generating member. The strain generating member of the strain sensor has two contact fixing portions with respect to the fixed side member, and the fixing target of the first contact fixing portion among the contact fixing portions is the fixed side member. And the fixing object of the second contact fixing portion is the fixing side. A peripheral surface of the wood, characterized in that the periphery of a portion the sensor element is mounted locally narrow or thin shape.

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 distortion generating member. The sensor element attached to the strain generating member outputs according to the strain of the strain generating member. The distortion of the fixed side member can be detected from this output. 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 sensor element. Moreover, this detected load can be used for vehicle control of an automobile.
Since the wheel bearing has a configuration in which a strain sensor including a strain generating member and a sensor element attached to the strain generating member is attached to the fixed side member, the load detecting sensor can be compactly installed in the vehicle. Since the strain generating member is a simple part that can be attached to the fixed member, attaching a sensor element to the member can provide excellent mass productivity and reduce costs.
The strain generating member has two contact fixing portions with respect to the fixed side member, and the first contact fixing portion of the contact fixing portions is a flange surface provided on the fixed side member. Since the contact fixing part is the peripheral surface of the fixed side member, the radial positions of the first and second contact fixing parts are different, and the distortion of the fixed side member is easily transferred and expanded on the distortion generating member. Become. Since the sensor element outputs in accordance with the transferred and enlarged distortion, the distortion of the fixed side member can be detected with high sensitivity, and the load measurement accuracy is increased.
Further, by making the peripheral portion of the portion where the sensor element is attached locally narrow or thin, distortion appears particularly large in the peripheral portion of the portion where the sensor element is attached in the strain generating member. . For this reason, the distortion of the stationary member can be detected with high sensitivity.

The fixed member can be an outer member. In that case, the strain sensor is attached to the outer peripheral surface of the outer member. Further, in this case, the strain generating member is formed in an L shape with a radial portion along the radial direction and an axial portion along the axial direction, and an intersection of the radial portion with the axial portion. It is preferable to attach the sensor element in the vicinity of.
The radial portion of the strain generating member is deformed according to the deformation of the flange of the outer member. Since the strain generating member is L-shaped, strain concentrates in the vicinity of the intersection with the axial portion in the radial portion, and a strain larger than that of the outer member appears. That is, the distortion generated in the vicinity of the intersection with the axial part in the radial part is a transfer and enlargement of the distortion at the proximal end of the flange. Since the sensor element is mounted at a location where the distortion of the outer member appears after being transferred and enlarged, an output of the sensor element corresponding to the enlarged distortion of the outer member is obtained, and the output of the outer member is obtained from the output. Distortion can be detected with high sensitivity.

The strain generating member may be a plate-pressed product.
When a member for generating strain is manufactured by pressing a plate material, it becomes easy to manufacture the member for generating strain and the cost can be reduced.

The strain generating member may be a machined product.
When a strain generating member is manufactured by machining, it is easy to change the width and thickness of the strain generating member, which is optimal for large distortion appearing at the periphery of the location where the sensor element is attached. It can be processed into a shape.

The strain generating member may be a sintered metal by metal powder injection molding.
When the strain generating member is manufactured by metal powder injection molding, a strain generating member with good dimensional accuracy can be obtained.

  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 double row rolling element interposed between both rolling surfaces, and a sealing device that seals an end between the outer member and the inner member, and rotatably supports the wheel with respect to the vehicle body. In a wheel bearing, a strain sensor comprising a strain generating member fixed to a fixed side member of the outer member and the inner member, and a strain measuring sensor element attached to the strain generating member. The strain generating member of the strain sensor has two contact fixing portions with respect to the fixed side member, and the fixing target of the first contact fixing portion among the contact fixing portions is the fixed side member. And the fixing object of the second contact fixing portion is the fixing side. Since the peripheral part of the material, where the sensor element is mounted, has a locally narrow or thin shape, a load detection sensor can be installed compactly on the vehicle and the load on the wheel Can be detected with high sensitivity. Since the strain generating member is a simple part that can be attached to the fixed member, attaching a sensor element to the member can provide excellent mass productivity and reduce costs.

  A first 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.

  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.

The outer member 1 is a fixed side member, and has a flange 1a attached to the knuckle in the suspension device (not shown) of the 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.

A strain sensor 21 shown in FIG. 4 is provided on the outer peripheral portion of the outer member 1. The strain sensor 21 includes a strain generating member 22 fixed to the outer member 1 via a first mounting member 24 and a second mounting member 25, and strain measurement attached to the strain generating member 22. Sensor element 23 for use.
The strain generating member 22 is configured in an L shape with a radial portion 22c along the radial direction and an axial portion 22d along the axial direction, and the distal end side of the radial portion 22c is the first for attachment. A first contact fixing portion 22 a fixed in contact with the member 24 is used, and a tip end side of the axial direction portion 22 d is a second contact fixing portion 22 b fixed in contact with the second mounting member 25. A notch 22e is formed on both sides in the circumferential direction near the intersection with the axial portion 22d in the radial portion 22c. Then, two sensor elements 23 are mounted side by side in the circumferential direction at a location where the width is narrowed by the notch 22e. That is, the peripheral portion 22f of the portion of the strain generating member 22 where the sensor element 23 is attached is locally narrow. The sensor element 23 is fixed to the distortion generating member 22 using, for example, an adhesive. In addition, the strain generating member 22 of this embodiment is manufactured by pressing a plate material. If the strain generating member 22 is a pressed product of a plate material, the strain generating member 22 can be easily manufactured, and the cost can be reduced.

The strain sensor 21 is fixed to the outer member 1 by using bolts 76, and an axial bolt insertion hole is formed in the first contact fixing portion 22 a of the strain generating member 22 and the first mounting member 24. 70 and 71 are formed, and radial bolt insertion holes 72 and 73 are formed in the second contact fixing portion 22b of the strain generating member 22 and the second mounting member 25, respectively. Further, a bolt screw hole 74 corresponding to the bolt insertion holes 70 and 71 in the axial direction is formed on the surface on the outboard side of the outer member flange 1 a, and the radial direction is formed on the outer peripheral surface of the outer member 1. Bolt screw holes 75 corresponding to the bolt insertion holes 72 and 73 are formed. The position of the bolt screw hole 74 is in the vicinity of the vehicle body mounting hole 14 on the flange 1a surface.
As shown in FIGS. 1 and 2, the strain sensor 21 inserts a bolt 76 from the outboard side through the bolt insertion hole 70 of the strain generating member 22 and the bolt insertion hole 71 of the first mounting member 24. The male threaded portion 76a of the bolt 76 is screwed into the bolt screwing hole 74 of the outer member 1, and the bolt insertion hole 72 of the strain generating member 22 and the bolt insertion hole 73 of the second mounting member 25 are viewed from the outer peripheral side. The bolt 76 is inserted, and the male screw portion 76 a of the bolt 76 is screwed into the bolt screw hole 75 of the outer member 1, thereby being fixed to the outer member 1.

The fixing of the strain generating member 22 and the first and second mounting members 24 and 25 and the fixing of the first and second mounting members 24 and 25 and the outer member 1 may be performed by adhesive fixing with an adhesive. Moreover, you may use an adhesive agent and a bolt together. Further, the fixing may be performed by welding without using an adhesive or a bolt.
Regardless of which of these fixing structures is employed, the distortion generating member 22 and the first and second mounting members 24 and 25, and the first and second mounting members 24 and 25 and the outer member 1 are firmly secured. Can be fixed. Therefore, the distortion generating 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 distortion generating member 22.

  As shown in FIGS. 1 to 3, the strain sensor 21 includes both first and second contact fixing portions 22 a and 22 b of the strain generating member 22 so that both contact fixing portions 22 a and 22 b are arranged around the outer member 1. It fixes to the outer peripheral part of the outer member 1 via the 1st, 2nd attachment members 24 and 25 so that it may become a position of the same phase with respect to a direction. If the first and second contact fixing portions 22a and 22b are in the same phase in the circumferential direction, the length of the strain generating member 22 can be shortened, so that the strain sensor 21 can be easily installed.

  The strain generating member 22 has a shape or material that does not cause plastic deformation by being fixed to the outer member 1. Further, the strain generating member 22 needs to have a shape that does not cause plastic deformation even when the maximum expected load is applied to the wheel bearing. The above assumed maximum force is the maximum force assumed in traveling that does not lead to vehicle failure. This is because, when plastic deformation occurs in the strain generating member 22, the deformation of the outer member 1 is not accurately transmitted to the strain generating member 22 and affects the measurement of strain.

  Various sensors can be used as the sensor element 23. For example, when the sensor element 23 is composed of a metal foil strain gauge, in consideration of the durability of the metal foil strain gauge, even when the maximum expected load is applied to the wheel bearing, the strain generating member 22 is preferably 1500 microstrain or less. For the same reason, when the sensor element 23 is composed of a semiconductor strain gauge, the amount of strain is preferably 1000 microstrain or less. Moreover, when the sensor element 23 is comprised by the thick film type sensor, it is preferable that the distortion amount is 1500 microstrain or less.

  As shown in FIG. 1, acting force estimation means 31 and abnormality determination means 32 are provided as means for processing the output of the sensor element 23 of the strain sensor 21. 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.

The operation of the sensor-equipped wheel bearing with 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 strain generating member 22 attached to the outer member 1. Deform. The sensor element 23 outputs in accordance with the distortion of the distortion generating member 22. The distortion of the outer member 1 can be detected from this output.
The radial portion 22c of the strain generating member 22 is deformed in accordance with the deformation of the flange 1a of the outer member 1. Since the strain generating member 22 is L-shaped, strain concentrates in the vicinity of the intersection of the radial portion 22c with the axial portion 22d, that is, the peripheral portion 22f where the sensor element 23 is attached, A larger distortion than that of the outer member 1 appears there. In other words, the distortion generated in the peripheral portion 22f is obtained by transferring and enlarging the distortion of the R portion 1b at the base end of the flange 1a. Since the fixing part of the first contact fixing part 22a is in the vicinity of the vehicle body mounting hole 14 on the surface of the flange 1a, the difference in the radial position between the first and second contact fixing parts 22a and 22b should be as large as possible. Therefore, the distortion of the outer member 1 tends to appear after being transferred and enlarged on the distortion generating member 22.
Furthermore, since the peripheral portion 22f where the sensor element 23 is attached has a locally narrow shape, the distortion appears particularly large in the distortion generating member 22. Since the sensor element 23 outputs in accordance with this strain, the strain of the outer member 1 can be detected with high sensitivity, and the strain measurement accuracy is increased.

  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 strain and load obtained and set in advance through experiments and simulations as described above, the acting force estimating means 31 is configured so that the external force acting on the wheel bearing or the distance between the tire and the road surface is determined by the output of the sensor element 23. Is calculated. 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 acting force estimating means 31 or the acting force between the tire and the road surface exceeds an allowable value. Output. This abnormal signal can be used for vehicle control of an automobile. In addition, 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.

  In the strain sensor 21 of this embodiment, since two sensor elements 23 are attached to the strain generating member 22, it is possible to detect a load with high accuracy by using the average value of the outputs of both sensor elements 23. It is. The number of sensor elements 23 may be one or three or more.

  Further, in the strain sensor 21 of this embodiment, the peripheral portion 22f of the portion where the sensor element 23 is attached in the strain generating member 22 is locally narrowed so that the sensor element 23 is attached. As shown in FIG. 5, the peripheral portion 22f of the portion where the sensor element 23 is attached to the strain generating member 22 is locally thinned as shown in FIG. By doing so, the distortion may be particularly large at the location where the sensor element 23 is attached. The peripheral portion 22f where the sensor element 23 in the distortion generating member 22 is attached may be locally narrow and thin. In either case, the strain can be made to appear larger than that of the strain generating member 22 having a constant width and a constant thickness shown in FIG.

  In this embodiment, the strain sensor 21 is provided at only one place on the outer member 1. However, for example, as shown in FIG. 6, the strain sensor 21 may be provided at two or more places. When the strain sensors 21 are provided at two or more locations, it becomes possible to detect a load with higher accuracy.

7 and 8 show different embodiments. In the strain sensor 21 of this embodiment, a sensor element 23 for measuring the strain of the strain generating member 22 is attached to a strain generating member 22 made of a machined product. The distortion generating member 22 includes a first contact fixing portion 22a that is fixed in contact with the outer member 1 in the vicinity of the vehicle body mounting hole 14, and a second contact fixing portion that is fixed in contact with the outer peripheral surface of the outer member 1. 22b, and are directly attached to the outer member 1 by these contact fixing portions 22a and 22b. In this embodiment, the adhesive is fixed by an adhesive.
The strain generating member 22 includes a radial portion 22c along the radial direction including the first contact fixing portion 22a and an axial portion 22d along the axial direction including the second contact fixing portion 22b. It is configured in the shape of a letter. The radial portion 22c is thinned so as to be less rigid than the axial portion 22d. Furthermore, a notch 22e is formed on both sides in the circumferential direction near the intersection with the axial portion 22d in the radial portion 22c. And one sensor element 23 is attached to the place where the width is narrowed by this notch 22e. That is, the peripheral portion 22f of the portion of the strain generating member 22 where the sensor element 23 is attached is locally narrow.
The other configuration is the same as that of the above embodiment. The same reference numerals are given to the same components.

Also in this embodiment, the distortion of the outer member 1 is transmitted to the distortion generating member 22, and the sensor element 23 outputs according to the distortion of the distortion generating member 22. At this time, the radial portion 22 c of the strain generating member 22 is deformed according to the deformation of the flange 1 a of the outer member 1. The distortion generating member 22 of this embodiment has an L-shaped configuration in which the radial portion 22c is lower in rigidity than the outer member 1, and the radial portion 22c having low rigidity and the axial portion 22d having high rigidity. Therefore, distortion is concentrated in the vicinity of the intersection of the radial portion 22c with the axial portion 22d, that is, the peripheral portion 22f of the portion where the sensor element 23 is attached. A big distortion appears. In other words, the distortion generated in the peripheral portion 22f is obtained by transferring and enlarging the distortion of the R portion 1b at the base end of the flange 1a.
Further, similarly to the above-described embodiment, the peripheral portion 22f where the sensor element 23 is attached has a locally narrow shape, so that distortion is particularly significant in the distortion generating member 22. Since the sensor element 23 outputs in accordance with this strain, the strain of the outer member 1 can be detected with high sensitivity, and the strain measurement accuracy is increased.

  In the strain sensor 21 of this embodiment, since the strain generating member 22 is a machined product, it is easy to change the thickness of the radial portion 22c and the axial portion 22d, and thereby the sensor element It is possible to further concentrate the strain on the peripheral portion 22f of the portion to which 23 is attached, thereby generating a larger strain.

  The strain generating 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 can be obtained, and sintered metal products can be manufactured with high dimensional accuracy, and mechanical strength is also high. There are advantages.

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 strain sensor 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 for 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.

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. It is the elements on larger scale of FIG. It is a front view which shows the outward member and distortion sensor of the wheel bearing with a sensor. (A) is a fractured side view of the strain sensor, (B) is a rear view thereof, and (C) is a perspective view thereof. (A) is a side view of a different strain sensor, (B) is a rear view thereof, and (C) is a perspective view thereof. It is a front view which shows the outward member and strain sensor of a different wheel bearing with a sensor. It is sectional drawing of the bearing for wheels with a sensor concerning different embodiment of this invention. (A) is a top view of the strain sensor of the wheel bearing with a sensor, (B) is the side view, (C) is the back view. (A) is a side view of a strain sensor as a comparative example, (B) is a rear view thereof, and (C) is a perspective view thereof.

Explanation of symbols

1 ... Outer member (fixed side member)
1a ... Flange 2 ... Inward member (rotation side member)
3, 4 ... rolling surface 5 ... rolling elements 7, 8 ... sealing device 14 ... vehicle body mounting hole 21 ... strain sensor 22 ... strain generating member 22a ... first contact fixing portion 22b ... second contact fixing portion 22e ... Notch 22f ... peripheral 23 ... sensor element

Claims (6)

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 A rolling bearing, and a sealing device that seals an end between the outer member and the inner member, and a wheel bearing that rotatably supports a wheel with respect to a vehicle body,
A strain sensor comprising a strain generating member fixed to a fixed side member of the outer member and the inner member and a strain measuring sensor element attached to the strain generating member is provided. The strain generating member has two contact fixing portions with respect to the fixed side member, and the fixing target of the first contact fixing portion of the contact fixing portions is a flange provided on the fixed side member. And the second contact fixing portion is fixed to the peripheral surface of the fixed side member, and the peripheral portion of the portion where the sensor element is attached is locally narrow or thin. A sensor-equipped wheel bearing.   The sensor-equipped wheel bearing according to claim 1, wherein the fixed-side member is an outer member.   3. The distortion generating member according to claim 2, wherein the distortion generating member is configured in an L shape by a radial portion along the radial direction and an axial portion along the axial direction, and intersects the axial portion at the radial portion. The wheel bearing with a sensor which attached the said sensor element in the vicinity.   4. The wheel bearing with sensor according to claim 1, wherein the distortion generating member is a press-formed product of a plate material. 5.   The bearing for sensor wheel according to any one of claims 1 to 3, wherein the distortion generating member is a machined product.   4. The sensor-equipped wheel bearing according to claim 1, wherein the strain generating member is a sintered metal formed by metal powder injection molding.

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