Mounting structure of integrated rotation sensor bearing

Abstract

This mounting structure is a structure used to mount, on a housing, an integrated rotation sensor bearing in which a bearing and a sensor stator are integrated together. The housing is provided with a pin hole. The sensor stator includes a knock pin that is press-fit into the pin hole. The integrated rotation sensor bearing is mounted on the housing by fitting an outer ring of the bearing into the housing or fitting an inner ring of the bearing into a rotary shaft, and press-fitting the knock pin into the pin hole.

Description

Mounting structure of bearing with integrated rotation sensor

[0001] The present disclosure relates to a mounting structure for mounting a bearing integrated with a rotation sensor to a housing.

[0002] For example, Patent Document 1 describes a rotation sensor that detects the rotation of a rotating shaft. However, in such a rotation sensor, if the position of the sensor stator that detects the rotation of the rotating shaft is misaligned, the rotation detection accuracy decreases. For this reason, in the rotation sensor described in Patent Document 1, the stator core of the sensor stator is fixed to the housing with multiple bolts.

[0003] JP 2014-77693 A

[0004] One possible solution is to integrate the sensor stator of the rotation sensor with the bearing to create a bearing with an integrated rotation sensor. When mounting this bearing with an integrated rotation sensor in a housing, the outer diameter surface of the outer ring can be fitted into a fitting in the housing, just like with a general bearing. However, if creep occurs in the outer ring of the bearing, the sensor stator mounted on the bearing will also rotate. This can potentially reduce the accuracy of detecting the rotation of the rotating shaft in the bearing with an integrated rotation sensor.

[0005] Therefore, an object of the present disclosure is to provide a mounting structure for a bearing with an integrated rotation sensor that can easily mount the bearing with an integrated rotation sensor to a housing while suppressing misalignment of the sensor stator.

[0006] The mounting structure for a bearing with an integrated rotation sensor according to the present disclosure may be [1] "a mounting structure for mounting a bearing with an integrated rotation sensor, having a sensor stator of a rotation sensor attached to a bearing supporting a rotating shaft, which detects rotation of the rotating shaft, to a housing, wherein the housing is provided with a pin hole, the sensor stator has a knock pin that is press-fitted into the pin hole, the bearing and the sensor stator are connected by a connecting structure that connects them by being pressed against each other along the center line of the bearing, the knock pin and the pin hole extend along the center line of the bearing, and the bearing with an integrated rotation sensor is mounted to the housing by fitting an outer ring of the bearing into the housing or fitting an inner ring of the bearing onto the rotating shaft, and by press-fitting the knock pin into the pin hole."

[0007] In this mounting structure, the outer ring of the bearing is fitted and fixed in the housing or the inner ring of the bearing is fitted and fixed around the rotating shaft, and the sensor stator is also fixed to the housing with a knock pin. As a result, this mounting structure makes it possible to easily mount the rotation sensor integrated bearing to the housing while suppressing positional deviation of the sensor stator in the rotation sensor integrated bearing.

[0008] In this mounting structure, the bearing and the sensor stator are connected by a connecting structure that connects them by pressing them together along the center line of the bearing. The extending direction of the knock pin and the pin hole extends along the center line of the bearing. In other words, the pressing direction when connecting the sensor stator and the bearing is the same as the direction in which the knock pin is inserted into the pin hole to mount the rotation sensor-integrated bearing to the housing.

[0009] Therefore, with this mounting structure, the process of connecting the bearing and the sensor stator and the process of mounting the sensor stator to the housing can be performed in a single process. In this way, with this mounting structure, the rotation sensor-integrated bearing can be easily assembled and attached to the housing.

[0010] The mounting structure for a bearing with an integrated rotation sensor according to the present disclosure may be [2] "the mounting structure for a bearing with an integrated rotation sensor according to [1] above, wherein the connecting structure is composed of a recess provided on the inner diameter surface of the outer ring and a connecting portion having one end attached to the sensor stator and the other end disposed inside the outer ring, connecting the outer ring and the sensor stator, the other end of the connecting portion being provided with a protrusion that fits into the recess of the outer ring, and the other end of the connecting portion being configured to be flexible radially inward of the bearing." In this mounting structure, the connecting portion attached to the sensor stator is flexible radially inward. As a result, in this mounting structure, the bearing and the sensor stator are pressed against each other along the center line of the bearing, allowing the protrusion to move radially inward. In this mounting structure, the protrusion of the connecting portion can be fitted into the recess of the outer ring.

[0011] The mounting structure for a bearing with an integrated rotation sensor according to the present disclosure may be [3] "the mounting structure for a bearing with an integrated rotation sensor according to the above [1] or [2], wherein the knock pin is provided on a connector portion of the sensor stator, or on an insulator that holds a coil provided on the sensor stator." In this case, in this mounting structure, the connector portion or the insulator of the sensor stator can be fixed to the housing by the knock pin.

[0012] The mounting structure for a bearing with an integrated rotation sensor disclosed herein is [4] "a mounting structure for mounting a bearing with an integrated rotation sensor, having a sensor stator of a rotation sensor attached to it that detects rotation of a rotating shaft, to a housing relative to a bearing that supports the rotating shaft, the mounting structure including a bolt that fixes the sensor stator to the housing, the housing having a first bolt hole that engages with the bolt, and the sensor stator having a second bolt hole through which the bolt is passed, the mounting structure for a bearing with an integrated rotation sensor being mounted to the housing by fitting the outer ring of the bearing into the housing or the inner ring of the bearing onto the rotating shaft, and by engaging the bolt passed through the second bolt hole with the first bolt hole."

[0013] In this mounting structure, the outer ring of the bearing is fitted and fixed in the housing, the inner ring of the bearing is fitted and fixed on the rotating shaft, and the sensor stator is also fixed to the housing with bolts. As a result, this mounting structure makes it possible to easily mount the rotation sensor integrated bearing to the housing while suppressing positional deviation of the sensor stator in the rotation sensor integrated bearing.

[0014] The mounting structure for a bearing with an integrated rotation sensor according to the present disclosure may be [5] "the mounting structure for a bearing with an integrated rotation sensor according to the above [4], wherein the second bolt hole is provided in a connector portion provided in the sensor stator, or in an insulator that holds a coil provided in the sensor stator." In this case, with this mounting structure, the sensor stator can be mounted to the housing using the connector portion or the insulator, without providing a bolt hole in the stator core that detects rotation of the rotating shaft.

[0015] The mounting structure for a bearing with an integrated rotation sensor according to the present disclosure may be [6] "the mounting structure for a bearing with an integrated rotation sensor according to [4] or [5] above, wherein the sensor stator is provided in the second bolt hole and includes a cylindrical collar through which the bolt passes." In this case, with this mounting structure, when the bolt is mounted, the force with which the bolt tightens the sensor stator can be received by the collar. This makes it possible to prevent damage to the mounting portion of the sensor stator where the bolt is mounted.

[0016] The mounting structure for a bearing with an integrated rotation sensor according to the present disclosure may be [7] "a mounting structure for mounting a bearing with an integrated rotation sensor, having a sensor stator of a rotation sensor attached to a bearing that supports a rotating shaft, which bearing is mounted in a housing, wherein the sensor stator has an extending portion that extends radially outward beyond the outer ring of the bearing, the housing is provided with a notch into which the extending portion is fitted, and an elastic member that is elastically deformable and fills a gap between the outer surface of the extending portion and the inner surface of the notch in the direction of rotation of the bearing, the mounting structure for a bearing with an integrated rotation sensor being mounted to the housing by fitting the outer ring of the bearing into the housing or fitting the inner ring of the bearing onto the rotating shaft, and by fitting the extending portion into the notch with the elastic member provided between the outer surface of the extending portion and the inner surface of the notch."

[0017] In this mounting structure, the outer ring of the bearing is fitted and fixed in the housing, or the inner ring of the bearing is fitted and fixed to the rotating shaft, and the extension of the sensor stator is fitted into a notch provided in the housing. An elastic member is provided between the outer surface of the extension and the inner surface of the notch. The provision of the elastic member suppresses rattle of the sensor stator relative to the housing in the direction of rotation of the bearing. In this manner, this mounting structure allows the rotation sensor-integrated bearing to be easily mounted to the housing while suppressing misalignment of the sensor stator.

[0018] The mounting structure for a bearing with an integrated rotation sensor according to the present disclosure may be [8] "the mounting structure for a bearing with an integrated rotation sensor according to the above [7], wherein the extension portion is a connector portion provided on the sensor stator, and the elastic member is constituted by an O-ring attached to the outer circumferential surface of the connector portion." In this case, with this mounting structure, rattle of the sensor stator relative to the housing can be easily suppressed by the O-ring attached to the connector portion.

[0019] The mounting structure for a bearing with an integrated rotation sensor according to the present disclosure may be [9] "a mounting structure for mounting a bearing with an integrated rotation sensor, having a sensor stator of a rotation sensor attached to a bearing that supports a rotating shaft, which detects rotation of the rotating shaft, to a housing, wherein the sensor stator has an extension that extends radially outward beyond the outer ring of the bearing, and the housing is provided with a notch into which the extension is fitted, and the bearing with an integrated rotation sensor is mounted to the housing by fitting the outer ring of the bearing into the housing or by fitting the inner ring of the bearing onto the rotating shaft and by press-fitting the extension into the notch."

[0020] In this mounting structure, the outer ring of the bearing is fitted and fixed in the housing, or the inner ring of the bearing is fitted and fixed around the rotating shaft, and the extension of the sensor stator is press-fitted into a notch provided in the housing. By press-fitting the extension of the sensor stator into the notch of the housing, rattle of the sensor stator relative to the housing is suppressed. In this way, with this mounting structure, the rotation sensor integrated bearing can be easily mounted to the housing while suppressing misalignment of the sensor stator.

[0021] The mounting structure for a bearing with an integrated rotation sensor according to the present disclosure may be

[10] "the mounting structure for a bearing with an integrated rotation sensor according to the above [9], wherein high-strength members having a strength greater than that of the extension portion are provided at both ends of the extension portion in the direction of rotation of the bearing, and the high-strength members abut against the inner surface of the notch." In this case, when the extension portion is subjected to a force in the direction of rotation of the bearing, the high-strength members are pressed against the inner surface of the notch in the housing. This mounting structure can thereby prevent damage to the extension portion even when a force in the direction of rotation of the bearing is applied to the extension portion.

[0022] The mounting structure for a bearing with an integrated rotation sensor according to the present disclosure may be

[11] "a mounting structure for mounting a bearing with an integrated rotation sensor, having a sensor stator of a rotation sensor attached thereto for detecting rotation of a rotating shaft, to a housing relative to a bearing that supports the rotating shaft, the mounting structure comprising a clip that sandwiches the sensor stator and the housing, the sensor stator having an extending portion that extends radially outward beyond an outer ring of the bearing, the housing being provided with a notch into which the extending portion is fitted, the clip sandwiching the extending portion and the housing such that a portion of the outer surface of the extending portion on one side in the direction of rotation of the bearing abuts the inner surface of the notch, the bearing with an integrated rotation sensor being mounted to the housing by fitting the outer ring of the bearing into the housing or the inner ring of the bearing onto the rotating shaft, and by sandwiching the extending portion and the housing by the clip."

[0023] In this mounting structure, the outer ring of the bearing is fitted and fixed in the housing, or the inner ring of the bearing is fitted and fixed on the rotating shaft, and the extension portion of the sensor stator is pressed against the inner surface of a notch provided in the housing by a clip. The clip also sandwiches the extension portion and the housing so that a portion of the outer surface of the extension portion on one side in the direction of rotation of the bearing abuts against the inner surface of the notch. In other words, the clip secures the sensor stator to the housing so that the sensor stator does not shift position even if a force is applied to the sensor stator in the direction of rotation of the bearing. In this way, this mounting structure makes it possible to easily mount the rotation sensor-integrated bearing to the housing while suppressing positional displacement of the sensor stator.

[0024] According to various aspects of the present disclosure, in a bearing with an integrated rotation sensor, it is possible to easily attach the bearing with an integrated rotation sensor to a housing while suppressing misalignment of the sensor stator.

[0025] FIG. 1 is a perspective view showing an integrated rotation sensor bearing used in the mounting structure for a bearing with an integrated rotation sensor according to the first embodiment. FIG. 2 is a cross-sectional view of the integrated rotation sensor bearing of FIG. 1. FIG. 3 is an exploded perspective view showing how the bearing with an integrated rotation sensor is mounted to a housing. FIG. 4 is a bottom view of the bearing with an integrated rotation sensor of FIG. 1. FIG. 5 is a perspective view showing the mounting structure for the bearing with an integrated rotation sensor. FIG. 6 is a front view showing the mounting structure for the bearing with an integrated rotation sensor. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. FIG. 8 is a perspective view showing an integrated rotation sensor bearing used in the mounting structure for a bearing with an integrated rotation sensor according to a second embodiment. FIG. 9 is a perspective view showing the mounting structure for the bearing with an integrated rotation sensor. FIG. 10 is a top view showing the mounting structure for the bearing with an integrated rotation sensor. FIG. 11 is a perspective view showing an integrated rotation sensor bearing used in the mounting structure for a bearing with an integrated rotation sensor according to a modified example of the second embodiment. FIG. 12 is a perspective view showing the mounting structure for the bearing with an integrated rotation sensor. FIG. 13 is a top view showing the mounting structure for the bearing with an integrated rotation sensor. FIG. 14 is a front view showing an integrated rotation sensor bearing used in the mounting structure for a bearing with an integrated rotation sensor according to the third embodiment. FIG. 15 is a side view showing the integrated rotation sensor bearing. FIG. 16 is a perspective view showing the mounting structure for a bearing with an integrated rotation sensor. FIG. 17 is a front view showing the mounting structure for a bearing with an integrated rotation sensor. FIG. 18 is a perspective view showing an integrated rotation sensor bearing used in the mounting structure for a bearing with an integrated rotation sensor according to the fourth embodiment. FIG. 19 is a front view of the bearing with an integrated rotation sensor. FIG. 20 is a perspective view showing the mounting structure for a bearing with an integrated rotation sensor. FIG. 21 is a front view showing the mounting structure for a bearing with an integrated rotation sensor. FIG. 22 is a perspective view showing an integrated rotation sensor bearing used in the mounting structure for a bearing with an integrated rotation sensor according to the fifth embodiment. FIG. 23 is a front view of the bearing with an integrated rotation sensor. FIG. 24 is a perspective view showing the mounting structure for a bearing with an integrated rotation sensor. FIG. 25 is an enlarged cross-sectional view showing the periphery of a clip in the mounting structure for a bearing with an integrated rotation sensor.

[0026] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and redundant description will be omitted.

[0027] (First embodiment) A first embodiment of a mounting structure for a bearing with an integrated rotation sensor will be described. As shown in Figures 1 and 2, a mounting structure X1 in the first embodiment mounts a bearing with an integrated rotation sensor 1 to a housing 5. The mounting structure X1 includes the bearing with an integrated rotation sensor 1 and a housing 5. The bearing with an integrated rotation sensor 1 includes a bearing 2, a sensor stator 3, and a connecting portion 4.

[0028] The bearing 2 rotatably supports a rotating shaft 6 relative to a housing 5 (see FIG. 2 ). The rotating shaft 6 may be, for example, the rotating shaft of an electric motor or motor generator of a hybrid vehicle or an electric vehicle. Hereinafter, the direction parallel to the center line A of the bearing 2 will be referred to as the axial direction, the direction perpendicular to the center line A will be referred to as the radial direction, and the direction along the circumference centered on the center line A when viewed from a direction parallel to the center line A will be referred to as the circumferential direction. In other words, the radial direction is the radial direction of the bearing 2. The circumferential direction is the rotational direction of the bearing 2.

[0029] The bearing 2 includes an inner ring 21, an outer ring 22, and a plurality of balls 23. The inner ring 21 is formed in an annular shape. The rotating shaft 6 is fitted into an inner diameter surface 21a of the inner ring 21. An inner ring raceway surface 21c extending annularly in the circumferential direction is formed on an outer diameter surface 21b of the inner ring 21. The inner ring raceway surface 21c is formed in a shape corresponding to the balls 23.

[0030] The outer ring 22 is formed in an annular shape. An outer ring raceway surface 22c extending annularly in the circumferential direction is formed on an inner diameter surface 22a of the outer ring 22. The outer ring raceway surface 22c is formed in a shape corresponding to the balls 23. An outer diameter surface 22b of the outer ring 22 is fitted into a fitting portion 5a of the housing 5. An engagement groove (recess) 22d is formed on the inner diameter surface 22a of the outer ring 22. In this embodiment, the engagement groove 22d extends annularly in the circumferential direction. The engagement groove 22d is provided closer to the sensor stator 3 than the outer ring raceway surface 22c.

[0031] Each of the plurality of balls 23 is formed in a spherical shape. The plurality of balls 23 is arranged between the inner ring raceway surface 21c and the outer ring raceway surface 22c. The plurality of balls 23 may be held by a cage. In this manner, the bearing 2 is configured as a ball bearing having the inner ring 21, the outer ring 22, and the plurality of balls 23. However, the bearing 2 is not limited to a ball bearing, and may be another type of rolling bearing.

[0032] The sensor stator 3 is disposed adjacent to the bearing 2 in the axial direction. The sensor stator 3 functions as a stator of a rotation sensor that detects rotation of the rotating shaft 6. In this embodiment, the sensor stator 3, together with a rotor 7 provided on the rotating shaft 6, constitute a resolver as a rotation sensor. The sensor stator 3 is disposed radially outside the rotor 7 with a radial gap C therebetween. The rotor 7 rotates together with the rotating shaft 6. The rotor 7 has a non-circular shape with an outer diameter that varies circumferentially so that the radial gap C between the rotor 7 and the sensor stator 3 changes with rotation. The rotor 7 rotates integrally with the rotating shaft 6, changing the radial gap C between the rotor 7 and teeth 32 provided on the sensor stator 3. This allows the sensor stator 3 to obtain a voltage corresponding to the rotation angle of the rotating shaft 6 via coils 35 wound around the teeth 32.

[0033] More specifically, the sensor stator 3 includes a stator core 31, a plurality of teeth 32, a first insulator 33, a second insulator (insulator) 34, and a plurality of coils 35. The stator core 31 has a generally annular shape. The plurality of teeth 32 protrude radially inward from the inner circumferential surface of the stator core 31. The plurality of teeth 32 are arranged in a row at predetermined intervals along the circumferential direction. The stator core 31 and the teeth 32 are made of electromagnetic steel plates. Alternatively, the stator core 31 and the teeth 32 may be made by stacking a plurality of electromagnetic steel plates in the axial direction.

[0034] The first insulator 33 and the second insulator 34 are arranged to sandwich the stator core 31 and the teeth 32. The coils 35 are wound around the teeth 32 via the first insulator 33 and the second insulator 34. That is, the coils 35 are held by the first insulator 33 and the second insulator 34. The multiple coils 35 are arranged in a row at predetermined intervals along the circumferential direction. As described above, the coils 35 detect the rotation of the rotor 7 attached to the rotating shaft 6 by generating a voltage corresponding to a change in the radial gap C between the teeth 32 and the rotor 7. The first insulator 33 and the second insulator 34 are each formed of an insulating resin material (e.g., synthetic resin). The first insulator 33 and the second insulator 34 electrically insulate the teeth 32 from the coils 35. In this embodiment, the second insulator 34 is arranged closer to the bearing 2 than the first insulator 33.

[0035] The sensor stator 3 also includes a connector portion 36. In this embodiment, the connector portion 36 is provided on the second insulator 34. The connector portion 36 protrudes radially outward and extends radially outward beyond the outer ring 22. The connector portion 36 is provided with a plurality of terminals connected to the coil 35. Note that the connector portion 36 is not limited to being provided so as to protrude radially outward. For example, the connector portion 36 may be provided so as to protrude from the first insulator 33 along the axial direction.

[0036] The connector portion 36 includes a plurality of terminals and a connector body that supports the plurality of terminals. For example, the connector body is formed of an insulating resin material, similar to the second insulator 34. A voltage corresponding to the rotation angle obtained by the coil 35 as the rotating shaft 6 rotates is output to the outside of the sensor stator 3 via terminals provided on the connector portion 36 and is used to detect the rotation angle of the rotating shaft 6.

[0037] The connecting portion 4 connects the bearing 2 and the sensor stator 3. As a result, the sensor stator 3 is supported (held) by the bearing 2 via the connecting portion 4. In this way, in the rotation sensor integrated bearing 1, the sensor stator 3 is attached to the bearing 2 by the connecting portion 4. In this embodiment, the connecting portion 4 connects the outer ring 22 of the bearing 2 and the sensor stator 3. As an example, the connecting portion 4 is made of a metal material. However, the connecting portion 4 may be made of a material other than metal. The connecting portion 4 has an annular shape and is arranged outside the multiple coils 35 lined up in the circumferential direction.

[0038] The connecting portion 4 includes a first engaging portion (protrusion) 41, a second engaging portion 42, and a main body portion 43. The main body portion 43 is a substantially cylindrical member having an annular shape. The inner and outer diameters of the main body portion 43 are larger than the outer diameter of the inner ring 21 and smaller than the inner diameter of the outer ring 22. The main body portion 43 may be tapered.

[0039] The first engagement portion 41 is provided at the end of the main body portion 43 on the bearing 2 side. The first engagement portion 41 engages with the outer ring 22 of the bearing 2. The first engagement portion 41 has a shape that protrudes radially outward from the main body portion 43. Note that, in this embodiment, the tip of the first engagement portion 41 in the protruding direction is folded back in an arc shape. Also, in this embodiment, three first engagement portions 41 are provided at predetermined intervals from each other along the circumferential direction (see FIG. 3 ). However, the number of first engagement portions 41 is not limited to three. For example, the first engagement portions 41 may be provided over the entire circumferential direction. Also, the first engagement portions 41 may be provided so as to be arranged at unequal intervals from each other along the circumferential direction. The coupling portion 4 engages with the outer ring 22 by fitting the first engagement portions 41 into the engagement grooves 22d of the outer ring 22.

[0040] The second engaging portion 42 is provided at an end of the main body portion 43 on the sensor stator 3 side. The second engaging portion 42 engages with the sensor stator 3. In the present embodiment, the second engaging portion 42 engages with the second insulator 34 of the sensor stator 3. For example, the second engaging portion 42 may be attached to the second insulator 34 by being embedded in the second insulator 34, which is a resin portion of the sensor stator 3.

[0041] In this way, the second engagement portion 42 provided at one end of the connecting portion 4 is attached to the second insulator 34 of the sensor stator 3. The first engagement portion 41 provided at the other end of the connecting portion 4 is disposed inside the outer ring 22. The first engagement portion 41 fits into the engagement groove 22d of the outer ring 22. In this way, the bearing 2 and the sensor stator 3 are connected to each other by the connecting portion 4. The end of the connecting portion 4 on the side where the first engagement portion 41 is provided is configured to be flexible radially inward. In other words, the first engagement portion 41 can move radially inward when the connecting portion 4 flexes.

[0042] Here, the sensor stator 3 to which the connecting portion 4 is attached and the bearing 2 are connected by being pressed against each other along the center line A of the bearing 2. When the bearing 2 and the sensor stator 3 are connected, the first engaging portion 41 of the connecting portion 4 is brought into contact with a corner 22e between the inner diameter surface 22a of the outer ring 22 and the end face of the outer ring 22 on the sensor stator 3 side. In this embodiment, the first engaging portion 41 has an arc shape. Therefore, when brought into contact with the corner 22e, the first engaging portion 41 moves radially inward.

[0043] That is, the first engagement portion 41 of the connecting portion 4 attached to the sensor stator 3 is pressed against the corner portion 22e of the outer ring 22 along the center line A. As a result, the first engagement portion 41 moves radially inward. As the first engagement portion 41 (sensor stator 3) is further pressed toward the bearing 2, the first engagement portion 41 reaches the position of the engagement groove 22d and moves radially outward within the engagement groove 22d. As a result, the first engagement portion 41 and the engagement groove 22d engage with each other.

[0044] In this way, the bearing 2 and the sensor stator 3 are connected to each other by a connecting structure B that connects them by being pressed against each other along the center line A of the bearing 2. This connecting structure B is composed of the engagement groove 22d of the outer ring 22 and the connecting part 4 that can move the first engagement part 41 radially inward by bending.

[0045] In the present embodiment, the arc-shaped first engagement portion 41 is moved radially inward by abutting against the corner 22e. The configuration (structure) for moving the first engagement portion 41 radially inward is not limited to this configuration. For example, the corner 22e may have a tapered shape that moves the first engagement portion 41 radially inward when pressed against it. Furthermore, for example, the first engagement portion 41 is not limited to being formed in an arc shape, and may have an inclined surface that allows it to move radially inward.

[0046] Furthermore, as shown in FIGS. 1 , 3 , and 4 , the sensor stator 3 includes a knock pin 37. The knock pin 37 is press-fitted into a pin hole 5e (see FIG. 7 ) provided in the housing 5. In this embodiment, the knock pin 37 is provided on the second insulator 34. In this embodiment, the second insulator 34 has a protruding portion 34a that protrudes radially outward. The protruding portion 34a is provided at a position different from the connector portion 36 and protrudes in a direction different from the connector portion 36. In this embodiment, the knock pin 37 is provided on the protruding portion 34a of the second insulator 34. The knock pin 37 protrudes from the protruding portion 34a toward the side opposite to the side where the bearing 2 is provided. The knock pin 37 extends along the center line A. The knock pin 37 may be formed of a resin material. In this case, the knock pin 37 may be molded integrally with the protruding portion 34a. That is, the knock pin 37 may be molded integrally with the second insulator 34 having the protruding portion 34a. However, the material of the knock pin 37 is not limited to a resin material. Furthermore, the knock pin 37 is not limited to being molded integrally with the second insulator 34. The knock pin 37 may be provided separately from the protruding portion 34a. In this case, the knock pin 37 may be attached to the protruding portion 34a by an appropriate method.

[0047] As shown in FIG. 3 , the housing 5 is provided with a fitting portion 5a, a accommodating portion 5b, a first notch (notch) 5c, a second notch 5d, and a pin hole 5e (see FIG. 7 ). While the housing 5 is shown in FIG. 3 as having a substantially rectangular parallelepiped shape, the shape of the housing 5 is not limited to the illustrated shape. The shape of the housing 5 in other figures is not limited to the illustrated shape. The fitting portion 5a is fitted with the outer diameter surface 22b of the outer ring 22 of the bearing 2. The fitting portion 5a has a fitting surface 5aa that abuts against the outer diameter surface 22b of the outer ring 22. The fitting surface 5aa is substantially cylindrical. The fitting surface 5aa of the fitting portion 5a extends along the center line A. Here, the outer ring 22 of the bearing 2 is press-fitted into the fitting portion 5a.

[0048] The accommodation portion 5b is located at a position deeper than the fitting portion 5a. The accommodation portion 5b accommodates the sensor stator 3 of the rotation sensor integrated bearing 1. The first cutout portion 5c extends radially outward from the fitting portion 5a and the accommodation portion 5b. The connector portion 36 of the sensor stator 3 is fitted into the first cutout portion 5c.

[0049] The second cutout 5d has a shape that extends radially outward from the fitting portion 5a and the accommodation portion 5b. The second cutout 5d is provided at a position different from the first cutout 5c. The protrusion 34a of the sensor stator 3 is fitted into the second cutout 5d. The pin hole 5e is provided on the inner surface of the second cutout 5d (see FIG. 7). The pin hole 5e extends along the center line A. A knock pin 37 provided on the sensor stator 3 is press-fitted into the pin hole 5e.

[0050] Next, a description will be given of the mounting structure X1 for mounting the rotation sensor integrated bearing 1 to the housing 5. As shown in Figures 5 to 7, in the mounting structure X1, the rotation sensor integrated bearing 1 is mounted to the housing 5 by fitting the outer ring 22 of the bearing 2 into the fitting portion 5a of the housing 5. Furthermore, in the mounting structure X1, the rotation sensor integrated bearing 1 is mounted to the housing 5 by press-fitting (inserting) the knock pin 37 of the sensor stator 3 into the pin hole 5e of the housing 5.

[0051] As described above, in this mounting structure X1, the outer ring 22 of the bearing 2 is fitted into and fixed in the fitting portion 5a of the housing 5, and the sensor stator 3 is also fixed to the housing 5 by the knock pin 37. In other words, the sensor stator 3 is also fixed to the housing 5 by the knock pin 37. Therefore, even if a force is applied to the sensor stator 3 in the rotational direction of the bearing 2, displacement of the sensor stator 3 is suppressed. As a result, in the mounting structure X1, the rotation sensor integrated bearing 1 can be easily mounted to the housing 5 while suppressing displacement of the sensor stator 3.

[0052] Note that, from the viewpoint of suppressing rotation of the sensor stator 3, the sensor stator 3 is only required to have one knock pin 37. This allows the rotation sensor-integrated bearing 1 to simplify the configuration of the sensor stator 3 and improve mountability. However, the number of knock pins 37 is not limited to one. From the viewpoint of firmly fixing the sensor stator 3, multiple knock pins 37 may be provided. Furthermore, the phase (circumferential position) at which the knock pin 37 is provided is not limited.

[0053] In this mounting structure X1, the bearing 2 and the sensor stator 3 are connected by a connecting structure B that connects them by pressing them against each other along the center line A of the bearing 2. The extending direction of the knock pin 37 and the pin hole 5e also extends along the center line A of the bearing 2. In other words, the pressing direction when connecting the sensor stator 3 and the bearing 2 is the same as the direction in which the knock pin 37 is press-fitted into the pin hole 5e to mount the rotation sensor-integrated bearing 1 to the housing 5.

[0054] Therefore, with this mounting structure X1, the process of connecting the bearing 2 and the sensor stator 3 and the process of attaching the sensor stator 3 to the housing 5 can be performed in a single process. That is, as shown in FIG. 3 , the sensor stator 3, to which the connecting portion 4 is attached, and the bearing 2 are aligned with respect to the housing 5. Then, with the sensor stator 3 sandwiched between them, the bearing 2 is pressed against the housing 5. This pressing connects the bearing 2 and the sensor stator 3 via the connecting portion 4, and the knock pin 37 is inserted into the pin hole 5e. This completes the assembly of the rotation sensor-integrated bearing 1 and the attachment of the rotation sensor-integrated bearing 1 to the housing 5. As such, with this mounting structure X1, the assembly of the rotation sensor-integrated bearing 1 and the attachment to the housing 5 can be easily performed.

[0055] The bearing 2 and the sensor stator 3 are connected to each other by a connecting structure B. The connecting portion 4 that constitutes the connecting structure B has an end portion on the first engagement portion 41 side that is flexible radially inward. As a result, in this mounting structure X1, the bearing 2 and the sensor stator 3 are pressed against each other along the center line A of the bearing 2, thereby allowing the first engagement portion 41 to move radially inward. The mounting structure X1 also allows the first engagement portion 41 to be fitted into the engagement groove 22d of the outer ring 22.

[0056] The knock pin 37 is provided on the protruding portion 34a of the second insulator 34 provided on the sensor stator 3. As a result, in the mounting structure X1, the second insulator 34 of the sensor stator 3 can be fixed to the housing 5 by the knock pin 37.

[0057] In the present embodiment, the knock pin 37 is provided on the protruding portion 34a of the second insulator 34. However, the location where the knock pin 37 is provided is not limited thereto. For example, the knock pin 37 may be provided on the connector portion 36. In this case, the mounting structure X1 can fix the connector portion 36 of the sensor stator 3 to the housing 5 by the knock pin 37. When the knock pin 37 is provided on the connector portion 36, the knock pin 37 may be formed from a resin material and molded integrally with the connector portion 36. However, the material of the knock pin 37 is not limited to a resin material. Furthermore, the knock pin 37 is not limited to being molded integrally with the connector portion 36. The knock pin 37 may be provided separately from the connector portion 36. In this case, the knock pin 37 may be attached to the connector portion 36 by an appropriate method.

[0058] Second Embodiment A second embodiment of the mounting structure for a bearing with an integrated rotation sensor will now be described. As shown in Figures 8 and 9, a mounting structure X2 for a bearing with an integrated rotation sensor according to the second embodiment mounts a bearing with an integrated rotation sensor 1A to a housing 5A. The mounting structure X2 includes the bearing with an integrated rotation sensor 1A, a housing 5A, and a bolt 10. As shown in Figure 8, the bearing with an integrated rotation sensor 1A includes a bearing 2, a sensor stator 3A, and a connecting portion 4 (see Figure 10). The bearing 2 and connecting portion 4 have the same configurations as those described in the first embodiment.

[0059] The sensor stator 3A does not have the protruding portion 34a and the knock pin 37 of the sensor stator 3 according to the first embodiment. Moreover, the sensor stator 3A has a connector portion 36A having a different configuration instead of the connector portion 36 according to the first embodiment. Other configurations of the sensor stator 3A are the same as those of the sensor stator 3 according to the first embodiment.

[0060] Similar to the connector portion 36 according to the first embodiment, the connector portion 36A is provided with a plurality of terminals connected to the coil 35. The sensor stator 3A is provided with connector bolt holes (second bolt holes) 36a through which the bolts 10 are passed. In this embodiment, the connector bolt holes 36a are provided in the connector portion 36A of the sensor stator 3A. The connector bolt holes 36a are formed in the connector main body of the connector portion 36A. The connector bolt holes 36a are formed in a portion (connector main body) formed from resin, avoiding the terminal portions of the connector portion 36A. The connector bolt holes 36a extend along the center line A of the bearing 2.

[0061] As shown in Figures 9 and 10, the housing 5A does not have the second cutout 5d and pin hole 5e of the housing 5 according to the first embodiment. Similar to the housing 5 according to the first embodiment, the housing 5A is provided with a fitting portion 5a, a accommodating portion 5b, and a first cutout 5c. Furthermore, the housing 5A is provided with a housing bolt hole (first bolt hole) 5f on the surface behind the portion where the first cutout 5c is provided (see Figure 10). The housing bolt hole 5f extends along the center line A of the bearing 2. The housing bolt hole 5f engages with a bolt 10.

[0062] The bolts 10 secure the sensor stator 3A to the housing 5A. The bolts 10 are passed through the connector bolt holes 36a of the sensor stator 3A. The tips of the bolts 10 engage with the housing bolt holes 5f of the housing 5A. The heads of the bolts 10 press against the connector portion 36A, thereby securing the connector portion 36A to the housing 5A.

[0063] Next, a mounting structure X2 for mounting the rotation sensor integrated bearing 1A to the housing 5A will be described. As shown in Figures 9 and 10, in the mounting structure X2, the rotation sensor integrated bearing 1A is mounted to the housing 5A by fitting the outer ring 22 of the bearing 2 into the fitting portion 5a of the housing 5A. Furthermore, in the mounting structure X2, the rotation sensor integrated bearing 1A is mounted to the housing 5A by engaging the bolts 10 passed through the connector bolt holes 36a of the sensor stator 3A with the housing bolt holes 5f.

[0064] As described above, in the mounting structure X2, the outer ring 22 of the bearing 2 is fitted into and fixed to the fitting portion 5a of the housing 5A, and the sensor stator 3A is also fixed to the housing 5A by the bolts 10. As a result, in this mounting structure X2, the rotation sensor integrated bearing 1A can be easily mounted to the housing 5A while suppressing positional deviation of the sensor stator 3A.

[0065] In order to suppress rotation of the sensor stator 3A, the sensor stator 3A is required to have only one bolt 10. This allows the rotation sensor-integrated bearing 1A to simplify the configuration of the sensor stator 3A and improve mountability. However, the number of bolts 10 is not limited to one. In order to firmly fix the sensor stator 3A, multiple bolts 10 may be provided. Furthermore, the phase (circumferential position) at which the bolt 10 is provided is not limited.

[0066] The connector bolt holes 36a through which the bolts 10 are passed are provided in the connector portion 36A of the sensor stator 3A. As a result, in the mounting structure X2, the sensor stator 3A can be mounted to the housing 5A using the connector portion 36A without providing bolt holes in the stator core 31 that detects the rotation of the rotating shaft 6.

[0067] The sensor stator 3A may include a cylindrical collar disposed within the connector bolt hole 36a. The bolt 10 is passed through the collar. The collar may be molded integrally with the connector body of the connector portion 36A, which is formed from a resin material. The collar preferably has a length equal to or greater than the length of the bolt 10 in the extension direction (i.e., the thickness of the connector portion 36A where the connector bolt hole 36a is provided). In this case, in the mounting structure X2, when the bolt 10 is attached, the collar can withstand the force with which the bolt 10 tightens the connector portion 36A. This prevents damage to the mounting portion of the sensor stator 3A where the bolt 10 is attached.

[0068] The connector bolt hole 36a does not have to be annular. For example, the connector bolt hole 36a may have a shape in which a portion of the edge of the hole is cut out. For example, the connector bolt hole 36a may have a generally U-shape with a portion of the edge of the hole open. In this manner, the connector bolt hole 36a is not limited to being a perfectly circular hole. In this embodiment, the connector bolt hole 36a includes a shape that surrounds at least a portion of the periphery of the bolt 10.

[0069] (Modification of Second Embodiment) A modification of the second embodiment will be described. In the second embodiment, the connector bolt holes 36a through which the bolts 10 are passed are provided in the connector portion 36A. As shown in FIG. 11 , in this modification, the bolt holes through which the bolts 10 are passed are provided in the second insulator 34.

[0070] In the rotation sensor integrated bearing 1Aa according to this modified example, an insulator bolt hole (second bolt hole) 34b is provided in a protruding portion 34a instead of the knock pin 37 of the rotation sensor integrated bearing 1 according to the first embodiment. The other configuration of the rotation sensor integrated bearing 1Aa is similar to that of the rotation sensor integrated bearing 1 according to the first embodiment. The insulator bolt hole 34b is provided in the protruding portion 34a provided in the second insulator 34. The insulator bolt hole 34b extends along (penetrates) the center line A of the bearing 2.

[0071] As shown in Figures 12 and 13, the housing 5Aa according to this modification has housing bolt holes (first bolt holes) 5g instead of the pin holes 5e of the housing 5 according to the first embodiment. Note that Figure 13 is a view in which a portion of the housing 5Aa is broken away to show the area around the housing bolt holes 5g. The housing bolt holes 5g provided in the housing 5Aa are located opposite the insulator bolt holes 34b when the rotation sensor-integrated bearing 1Aa is attached to the housing 5Aa. Here, the housing bolt holes 5g are provided on the surface of the housing 5Aa on the far side of the second cutout portion 5d into which the protruding portion 34a is fitted.

[0072] The housing bolt holes 5g extend along the center line A of the bearing 2. The housing bolt holes 5g engage with bolts 10. The bolts 10 secure the sensor stator 3Aa to the housing 5Aa. The bolts 10 are passed through the insulator bolt holes 34b of the sensor stator 3Aa. The tips of the bolts 10 engage with the housing bolt holes 5g of the housing 5Aa. The bolts 10 secure the sensor stator 3Aa to the housing 5Aa by pressing the heads of the bolts 10 against the protrusions 34a.

[0073] Next, a mounting structure X2a for mounting the rotation sensor integrated bearing 1Aa to the housing 5Aa will be described. As shown in Figures 12 and 13, in the mounting structure X2a, the rotation sensor integrated bearing 1Aa is mounted to the housing 5Aa by fitting the outer ring 22 of the bearing 2 into the fitting portion 5a of the housing 5Aa. Furthermore, in the mounting structure X2a, the rotation sensor integrated bearing 1Aa is mounted to the housing 5Aa by engaging the bolts 10 passed through the insulator bolt holes 34b of the sensor stator 3Aa with the housing bolt holes 5g.

[0074] As described above, in the mounting structure X2a, the outer ring 22 of the bearing 2 is fitted into and fixed to the fitting portion 5a of the housing 5Aa, and the sensor stator 3Aa is also fixed to the housing 5Aa by the bolts 10. As a result, in this mounting structure X2a, the rotation sensor-integrated bearing 1Aa can be easily mounted to the housing 5Aa while suppressing positional deviation of the sensor stator 3Aa.

[0075] The insulator bolt holes 34b, through which the bolts 10 are passed, are provided in the protruding portions 34a of the second insulator 34. As a result, in the mounting structure X2a, the sensor stator 3Aa can be mounted to the housing 5Aa using the second insulator 34 without providing bolt holes in the stator core 31 that detects the rotation of the rotating shaft 6.

[0076] As in the second embodiment, the sensor stator 3Aa may include a cylindrical collar disposed within the insulator bolt hole 34b. This collar may be molded integrally with the protruding portion 34a of the second insulator 34, which is made of a resin material. The collar preferably has a length equal to or greater than the length of the bolt 10 in the extension direction (i.e., the thickness of the protruding portion 34a). In this case, when the bolt 10 is attached to the mounting structure X2a, the collar can withstand the force of the bolt 10 tightening the protruding portion 34a. This prevents damage to the mounting portion of the sensor stator 3Aa where the bolt 10 is attached.

[0077] Like the connector bolt hole 36a according to the second embodiment, the insulator bolt hole 34b is not limited to being annular. Furthermore, the portion of the protruding portion 34a where the insulator bolt hole 34b is formed may be formed from a metal material. That is, the protruding portion 34a may be configured by integrally molding a metal material having the insulator bolt hole 34b. Like the second embodiment, a plurality of bolts 10 may be provided.

[0078] Third Embodiment A third embodiment of the mounting structure for a bearing with an integrated rotation sensor will now be described. As shown in Figures 14 and 16, the mounting structure X3 for a bearing with an integrated rotation sensor according to the third embodiment mounts a bearing with an integrated rotation sensor 1B to a housing 5B. The mounting structure X3 includes a bearing with an integrated rotation sensor 1B, a housing 5B, and an elastic member 11. As shown in Figures 14 and 15, the bearing with an integrated rotation sensor 1B includes a bearing 2, a sensor stator 3B, and a connecting portion 4. The bearing 2 and connecting portion 4 have the same configurations as those described in the first embodiment.

[0079] The sensor stator 3B does not have the protruding portion 34a and the knock pin 37 of the sensor stator 3 according to the first embodiment. The other configuration of the sensor stator 3B is similar to that of the sensor stator 3 according to the first embodiment.

[0080] The elastic member 11 is an elastically deformable member. In the present embodiment, the elastic member 11 is configured by an O-ring, for example. The elastic member 11 is attached to an extension portion provided on the sensor stator 3B. This extension portion extends radially outward beyond the outer ring 22 of the bearing 2. In the present embodiment, the connector portion 36 is used as this extension portion. The elastic member 11 is attached to the connector portion 36 so as to surround the outer peripheral surface of the connector portion 36.

[0081] 16 and 17 , the housing 5B does not have the second cutout 5d and the pin hole 5e of the housing 5 according to the first embodiment. The housing 5B is provided with the fitting portion 5a, the accommodating portion 5b, and the first cutout 5c, similar to the housing 5 according to the first embodiment.

[0082] Next, a mounting structure X3 for mounting the rotation sensor integrated bearing 1B to the housing 5B will be described. As shown in Figures 16 and 17, in the mounting structure X3, the rotation sensor integrated bearing 1B is mounted to the housing 5B by fitting the outer ring 22 of the bearing 2 into the fitting portion 5a of the housing 5B. Furthermore, in the mounting structure X3, the rotation sensor integrated bearing 1B is mounted to the housing 5B by fitting the connector portion 36 into the first cutout portion 5c with the elastic member 11 attached to the connector portion 36.

[0083] 17 , the elastic member 11 is disposed between the outer surface of the connector portion 36 and the inner surface of the first cutout portion 5 c in the rotation direction Y of the bearing 2. The elastic member 11 fills the gap between the outer surface of the connector portion 36 and the inner surface of the first cutout portion 5 c in the rotation direction Y of the bearing 2.

[0084] As described above, in the mounting structure X3, the outer ring 22 of the bearing 2 is fitted into and fixed in the fitting portion 5a of the housing 5B, and the connector portion 36 of the sensor stator 3B is fitted into the first notch 5c provided in the housing 5B. In addition, an elastic member 11 is provided between the outer surface of the connector portion 36 and the inner surface of the first notch 5c. The provision of the elastic member 11 suppresses rattle of the sensor stator 3B relative to the housing 5B in the rotational direction Y of the bearing 2. In this way, in the mounting structure X3, the rotation sensor integrated bearing 1B can be easily mounted to the housing 5B while suppressing misalignment of the sensor stator 3B.

[0085] An O-ring is used as the elastic member 11 that fills the gap between the outer surface of the connector portion 36 and the inner surface of the first notch 5c in the rotational direction Y of the bearing 2. In this case, in the mounting structure X3, the O-ring as the elastic member 11 attached to the connector portion 36 can easily suppress rattling of the sensor stator 3B relative to the housing 5B.

[0086] The elastic member 11 is not limited to an O-ring. The elastic member 11 may be disposed between the outer surface of the connector portion 36 and the inner surface of the first cutout portion 5c in the rotational direction Y of the bearing 2. For example, the elastic members 11 may be disposed on one side and the other side of the gap between the outer surface of the connector portion 36 and the inner surface of the first cutout portion 5c in the rotational direction Y of the bearing 2. In other words, two elastic members 11 may be provided.

[0087] Furthermore, the elastic member 11 is not limited to being provided in the gap between the connector portion 36 and the first cutout portion 5c. For example, the elastic member 11 may be provided in the gap between an extending portion other than the connector portion 36 that extends outward and a cutout portion provided in the housing.

[0088] Fourth Embodiment A fourth embodiment of the mounting structure for a bearing with an integrated rotation sensor will now be described. As shown in Figures 18 and 20, the mounting structure X4 for a bearing with an integrated rotation sensor according to the fourth embodiment mounts a bearing with an integrated rotation sensor 1C to a housing 5C. The mounting structure X4 includes the bearing with an integrated rotation sensor 1C and a housing 5C. As shown in Figures 18 and 19, the bearing with an integrated rotation sensor 1C includes a bearing 2, a sensor stator 3C, and a connecting portion 4. The bearing 2 and connecting portion 4 have the same configurations as those described in the first embodiment.

[0089] The sensor stator 3C does not have the protruding portion 34a and the knock pin 37 of the sensor stator 3 according to the first embodiment. The sensor stator 3C has a connector portion (extension portion) 36C instead of the connector portion 36 according to the first embodiment. Other configurations of the sensor stator 3C are similar to those of the sensor stator 3 according to the first embodiment.

[0090] The connector portion 36C includes high-strength members 12 and 13. The high-strength members 12 and 13 have greater strength than the connector portion 36C. Here, the high-strength members 12 and 13 have greater strength than the connector body of the connector portion 36C. For example, the high-strength members 12 and 13 may be made of a metal material that is stronger than the connector body made of a resin material.

[0091] The high-strength members 12 and 13 are provided at both end portions of the connector portion 36C in the rotational direction Y of the bearing 2. It is preferable that the high-strength members 12 and 13 protrude slightly beyond the connector body of the connector portion 36C in the rotational direction Y of the bearing 2.

[0092] 20 and 21 , the housing 5C does not have the second cutout 5d and the pin hole 5e of the housing 5 according to the first embodiment. The housing 5C is provided with the fitting portion 5a, the accommodating portion 5b, and the first cutout 5c, similar to the housing 5 according to the first embodiment. A connector portion 36 including high-strength members 12 and 13 is press-fitted into the first cutout 5c.

[0093] Next, a mounting structure X4 for mounting the rotation sensor integrated bearing 1C to the housing 5C will be described. As shown in Figures 20 and 21, in the mounting structure X4, the rotation sensor integrated bearing 1C is mounted to the housing 5C by fitting the outer ring 22 of the bearing 2 into the fitting portion 5a of the housing 5C. Furthermore, in the mounting structure X4, the rotation sensor integrated bearing 1C is mounted to the housing 5C by press-fitting the connector portion 36, which includes high-strength members 12 and 13, into the first cutout portion 5c. In the rotation direction Y of the bearing 2, the high-strength members 12 and 13 each abut against the inner surface of the first cutout portion 5c.

[0094] As described above, in the mounting structure X4, the outer ring 22 of the bearing 2 is fitted into and fixed in the fitting portion 5a of the housing 5C, and the connector portion 36C of the sensor stator 3C is press-fitted into the first notch 5c provided in the housing 5C. By press-fitting the connector portion 36C of the sensor stator 3C into the first notch 5c of the housing 5C, rattle of the sensor stator 3C relative to the housing 5C is suppressed. In this way, in the mounting structure X4, the rotation sensor integrated bearing 1C can be easily mounted to the housing 5C while suppressing misalignment of the sensor stator 3C.

[0095] The connector portion 36C is provided with high-strength members 12 and 13 at both ends in the rotational direction Y of the bearing 2. In this case, when the connector portion 36 is subjected to a force in the rotational direction Y of the bearing 2, the high-strength members 12 and 13 are pressed against the inner surface of the first cutout portion 5c of the housing 5C. As a result, with the mounting structure X4, damage to the connector portion 36 can be suppressed even when a force in the rotational direction Y of the bearing 2 is applied to the connector portion 36C.

[0096] In the present embodiment, the connector portion 36C includes the high-strength members 12 and 13. However, this is not limiting, and the connector portion 36C may be configured not to include the high-strength members 12 and 13. In other words, the connector portion 36C that does not include the high-strength members 12 and 13 may be press-fitted into the first notch 5c of the housing 5C. Even in this case, the mounting structure X4 makes it possible to easily mount the rotation sensor integrated bearing 1C to the housing 5C while suppressing misalignment of the sensor stator 3C in the rotation sensor integrated bearing 1C.

[0097] Fifth Embodiment A fifth embodiment of the mounting structure for a bearing with an integrated rotation sensor will now be described. As shown in Figures 22 and 24, a mounting structure X5 for a bearing with an integrated rotation sensor according to the fifth embodiment mounts a bearing with an integrated rotation sensor 1D to a housing 5D. The mounting structure X5 includes the bearing with an integrated rotation sensor 1D, a housing 5D, and a clip 14. As shown in Figures 22 and 23, the bearing with an integrated rotation sensor 1D includes a bearing 2, a sensor stator 3D, and a connecting portion 4. The bearing 2 and connecting portion 4 have the same configurations as those described in the first embodiment.

[0098] The sensor stator 3D does not have the protruding portion 34a and the knock pin 37 of the sensor stator 3 according to the first embodiment. The sensor stator 3D has a connector portion 36D instead of the connector portion 36 according to the first embodiment. Other configurations of the sensor stator 3D are similar to those of the sensor stator 3 according to the first embodiment.

[0099] The connector portion 36D is provided with a connector clip hole 36b. The connector clip hole 36b extends along the center line A of the bearing 2. For example, the connector clip hole 36b is provided near one end of the connector portion 36D in the rotation direction Y of the bearing 2.

[0100] As shown in Figures 24 and 25, the housing 5D does not have the second cutout 5d and pin hole 5e of the housing 5 according to the first embodiment. Like the housing 5 according to the first embodiment, the housing 5D has a fitting portion 5a, a accommodating portion 5b, and a first cutout 5c. Furthermore, the housing 5D has a third cutout 5h. The third cutout 5h is located adjacent to the first cutout 5c in the rotational direction Y of the bearing 2. The depth of the third cutout 5h in the direction along the center line A of the bearing 2 is shallower than that of the first cutout 5c. A housing clip hole 5j is located on the rear surface of the third cutout 5h. The housing clip hole 5j extends along the center line A of the bearing 2.

[0101] The clip 14 sandwiches the sensor stator 3D and the housing 5D. The clip 14 is generally U-shaped. The clip 14 sandwiches the connector portion 36D and the housing 5D so that a portion of the outer surface of the connector portion 36D on one side in the rotational direction Y of the bearing 2 abuts against the inner surface of the first cutout portion 5c.

[0102] Specifically, in this embodiment, one end of the clip 14 is inserted into the housing clip hole 5j of the housing 5D. The other end of the clip 14 is inserted into the connector clip hole 36b of the connector portion 36D. The clip 14 pulls the connector portion 36D toward the housing clip hole 5j, thereby sandwiching the connector portion 36D and the housing 5D together. As a result, the connector portion 36D is pressed against the inner surface of the first cutout portion 5c on the side closer to the housing clip hole 5j in the rotational direction Y of the bearing 2.

[0103] Next, a mounting structure X5 for mounting the rotation sensor integrated bearing 1D to the housing 5D will be described. As shown in Figures 24 and 25, in the mounting structure X5, the rotation sensor integrated bearing 1D is mounted to the housing 5D by fitting the outer ring 22 of the bearing 2 into the fitting portion 5a of the housing 5D. Furthermore, in the mounting structure X5, the rotation sensor integrated bearing 1D is mounted to the housing 5D by clamping the connector portion 36D, which is fitted into the first cutout portion 5c, and the housing 5D with the clip 14. In the rotation direction Y of the bearing 2, the outer surface of the connector portion 36D is pressed against the inner surface of the first cutout portion 5c on the side where the housing clip hole 5j is provided.

[0104] As described above, in the mounting structure X5, the outer ring 22 of the bearing 2 is fitted and fixed in the fitting portion 5a of the housing 5D, and the connector portion 36D of the sensor stator 3D is pressed against the inner surface of the first notch 5c provided in the housing 5D by the clip 14. The clip 14 also sandwiches the connector portion 36D and the housing 5D so that a portion of the outer surface of the connector portion 36D on one side in the rotational direction Y of the bearing 2 abuts against the inner surface of the first notch 5c. In other words, the clip 14 can fix the sensor stator 3D to the housing 5D so that the sensor stator 3D does not shift in position even if a force is applied to the sensor stator 3D in the rotational direction Y of the bearing 2. In this way, in the mounting structure X5, the rotation sensor-integrated bearing 1D can be easily mounted to the housing 5D while suppressing positional deviation of the sensor stator 3D.

[0105] As another example, the outer ring of the rotation sensor-integrated bearing may be fitted into a fitting portion of the housing so that the outer ring does not rotate (shift) in the rotational direction relative to the housing. Specifically, for example, a convex portion may be provided on the outer diameter surface of the outer ring, and the outer ring may be fitted into the fitting portion of the housing while aligning the position of the convex portion with a concave portion provided in the fitting portion of the housing. In this case, the outer ring of the bearing is prevented from shifting in position relative to the housing, and therefore the sensor stator attached to the bearing is also prevented from shifting in position. Note that the outer ring may be fixed to the housing with bolts, for example.

[0106] In the first embodiment, the outer ring 22 of the bearing 2 is press-fitted into the fitting portion 5a of the housing 5. However, this is not limiting, and the inner ring 21 of the bearing 2 may be press-fitted onto the outer peripheral surface of the rotating shaft 6. In other words, the bearing 2 of the rotation sensor-integrated bearing 1 is attached to the housing 5 via the rotating shaft 6 that is rotatably supported by the housing 5. Similarly, in the other embodiments and modified examples, the inner ring 21 of the bearing 2 may be press-fitted onto the outer peripheral surface of the rotating shaft 6.

[0107] DESCRIPTION OF SYMBOLS 1, 1A to 1D, 1Aa...Rotation sensor integrated bearing, 2...Bearing, 3, 3A to 3D, 3Aa...Sensor stator, 4...Connecting portion, 5, 5A to 5D, 5Aa...Housing, 5c...First notch portion (notch portion), 5e...Pin hole, 5f...Housing bolt hole (first bolt hole), 5g...Housing bolt hole (second bolt hole), 6...Rotating shaft, 10...Bolt, 11...Elastic member (O-ring), 12, 13...High strength portion Material, 14...clip, 21...inner ring, 22...outer ring, 22d...engagement groove (recess), 34b...insulator bolt hole (second bolt hole), 36, 36A, 36C...connector portion (extension portion), 36a...connector bolt hole (second bolt hole), 34...second insulator (insulator), 37...knock pin, 41...first engagement portion (protrusion), A...center line, B...connecting structure, X1 to X5, X2a...mounting structure.

Claims

1. An installation structure for an integrated rotation sensor bearing, having a sensor stator of a rotation sensor that detects rotation of a rotating shaft attached to a bearing supporting a rotating shaft, attached to a housing, wherein a pin hole is provided in the housing, the sensor stator has a knock pin that is pressed into the pin hole, the bearing and the sensor stator are connected by a connecting structure that connects them to each other by being pressed against each other along the center line of the bearing, the knock pin and the pin hole extend along the center line of the bearing, and the integrated rotation sensor bearing is attached to the housing by fitting the outer ring of the bearing into the housing or the inner ring of the bearing onto the rotating shaft and by pressing the knock pin into the pin hole.

2. The mounting structure for a bearing with integrated rotation sensor as described in claim 1, wherein the connecting structure is composed of a recess provided on the inner diameter surface of the outer ring, and a connecting part having one end attached to the sensor stator and the other end located inside the outer ring, connecting the outer ring and the sensor stator, wherein the other end of the connecting part is provided with a protrusion that fits into the recess of the outer ring, and the other end of the connecting part is configured to be flexibly radially inward of the bearing.

3. A mounting structure for a bearing with an integrated rotation sensor as described in claim 1 or 2, wherein the knock pin is provided in a connector portion provided on the sensor stator, or is provided on an insulator that holds a coil provided on the sensor stator.

4. A mounting structure for mounting an integrated rotation sensor bearing, having a sensor stator of a rotation sensor that detects rotation of a rotating shaft attached to a bearing supporting the rotating shaft, to a housing, the mounting structure comprising a bolt that fixes the sensor stator to the housing, the housing having a first bolt hole that engages with the bolt, and the sensor stator having a second bolt hole through which the bolt is passed, the mounting structure for a bearing with integrated rotation sensor being mounted to the housing by fitting the outer ring of the bearing into the housing or the inner ring of the bearing onto the rotating shaft, and by engaging the bolt passed through the second bolt hole with the first bolt hole.

5. A mounting structure for a bearing with an integrated rotation sensor as described in claim 4, wherein the second bolt hole is provided in a connector portion provided on the sensor stator, or in an insulator that holds a coil provided on the sensor stator.

6. A mounting structure for a rotation sensor integrated bearing as set forth in claim 4 or 5, wherein the sensor stator is provided in the second bolt hole and has a cylindrical collar through which the bolt is passed.

7. An installation structure for mounting a bearing with integrated rotation sensor, having a sensor stator of a rotation sensor that detects rotation of a rotating shaft attached to a bearing supporting a rotating shaft, to a housing, wherein the sensor stator has an extension portion that extends radially outward beyond the outer ring of the bearing, the housing is provided with a notch into which the extension portion is fitted, and an elastic member that is elastically deformable and fills a gap between the outer surface of the extension portion and the inner surface of the notch in the rotation direction of the bearing, the bearing with integrated rotation sensor is mounted to the housing by fitting the outer ring of the bearing into the housing or fitting the inner ring of the bearing onto the rotating shaft, and by fitting the extension portion into the notch with the elastic member provided between the outer surface of the extension portion and the inner surface of the notch.

8. A mounting structure for a bearing with an integrated rotation sensor as set forth in claim 7, wherein the extension portion is a connector portion provided on the sensor stator, and the elastic member is constituted by an O-ring attached to the outer circumferential surface of the connector portion.

9. An installation structure for mounting an integrated rotation sensor bearing, having a sensor stator of a rotation sensor that detects rotation of a rotating shaft attached to a bearing supporting the rotating shaft, to a housing, wherein the sensor stator has an extension portion that extends radially outward beyond the outer ring of the bearing, and the housing is provided with a notch into which the extension portion is fitted, and the integrated rotation sensor bearing is mounted to the housing by fitting the outer ring of the bearing into the housing or fitting the inner ring of the bearing onto the rotating shaft and by pressing the extension portion into the notch.

10. A mounting structure for an integral rotation sensor bearing as described in claim 9, wherein high-strength members having strength greater than that of the extension portion are provided at both ends of the extension portion in the direction of rotation of the bearing, and the high-strength members abut against the inner surface of the cutout portion.

11. An installation structure for mounting a bearing with an integrated rotation sensor, having a sensor stator of a rotation sensor that detects rotation of a rotating shaft attached to a bearing that supports a rotating shaft, to a housing, the installation structure comprising a clip that clamps the sensor stator and the housing, the sensor stator having an extension portion that extends radially outward beyond the outer ring of the bearing, the housing being provided with a notch into which the extension portion is fitted, and the clip clamps the extension portion and the housing such that a portion of the outer surface of the extension portion on one side in the direction of rotation of the bearing abuts the inner surface of the notch, the bearing with an integrated rotation sensor being attached to the housing by fitting the outer ring of the bearing into the housing or fitting the inner ring of the bearing onto the rotating shaft, and by clamping the extension portion and the housing by the clip.

Images