Fitting structure of rotation sensor integrated bearing

Abstract

To facilitate fixation of an outer ring to a housing and suppress deterioration in detection accuracy for rotation of a rotation shaft.SOLUTION: A fitting structure of fitting a rotation sensor integrated bearing 1 to a housing 5 includes: the rotation sensor integrated bearing 1; a retainer plate 4 for fixing an outer ring 22 of a bearing 2 to the housing 5; and a bolt 6 for fixing the retainer plate 4 to the housing 5. The retainer plate 4 is fitted to the outer ring 22. The bolt 6 fixes the retainer plate 4 to the housing 5 so as to hold the outer ring 22 between the retainer plate 4 and the housing 5.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a mounting structure for mounting a bearing with an integrated rotation sensor to a housing. [Background technology]

[0002] For example, Patent Document 1 describes a rotation sensor that detects the rotation of a rotating shaft. In such a rotation sensor, if the position (position in the direction of rotation) 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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-77693 Summary of the Invention [Problem to be solved by the invention]

[0004] One possible solution is to integrate the sensor stator of the rotation sensor with the outer ring of the bearing to create a bearing with an integrated rotation sensor. Such a bearing with an integrated rotation sensor is mounted by press-fitting the outer diameter surface of the outer ring of the bearing into the housing. In this case, if creep occurs in the outer ring of the bearing, the sensor stator mounted on the bearing will also rotate relative to the housing. Misalignment of the sensor stator relative to the housing may 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 invention is to provide a mounting structure for a bearing with an integrated rotation sensor that makes it easy to fix the outer ring to the housing and prevents a decrease in the detection accuracy of the rotation of the rotating shaft. [Means for solving the problem]

[0006] The mounting structure for a bearing with an integrated rotation sensor according to the present invention is [1] "a mounting structure for mounting a bearing with an integrated rotation sensor to a housing, comprising: the bearing with an integrated rotation sensor having a bearing and a sensor stator of a rotation sensor that detects rotation of a rotating shaft; a retainer plate that fixes the outer ring of the bearing to the housing; and a fixture that fixes the retainer plate to the housing, wherein the bearing has an inner ring through which the rotating shaft passes, the outer ring attached to the housing, and a plurality of rolling elements arranged between the inner ring and the outer ring, the sensor stator is attached to the outer ring, and the fixture fixes the retainer plate to the housing so that the outer ring is sandwiched between the retainer plate and the housing."

[0007] In this mounting structure, the retainer plate is fixed to the housing by a fixing device. During this fixing, the outer ring of the bearing is sandwiched between the retainer plate and the housing. This sandwiching secures the outer ring to the housing. This prevents creep from occurring in the outer ring of the bearing. In this way, sandwiching the outer ring between the retainer plate and the housing makes it easy to fix the outer ring to the housing. In addition, the sensor stator is attached to the outer ring of the bearing. Because creep of the outer ring is suppressed as described above, displacement of the sensor stator attached to the outer ring relative to the housing is suppressed. In this way, this mounting structure for a bearing with an integrated rotation sensor makes it easy to fix the outer ring to the housing, and prevents a decrease in the accuracy of detecting the rotation of the rotating shaft.

[0008] The mounting structure for a bearing with an integrated rotation sensor according to the present invention may be [2] "the mounting structure for a bearing with an integrated rotation sensor described in [1] above, wherein the retainer plate is attached to the outer ring so as to be rotatable relative to the outer ring in the circumferential direction." In this case, for example, even after the outer ring of the bearing has been fitted into the fitting hole of the housing, before being fixed with a fixing device, the mounting position of the retainer plate can be adjusted by rotating the retainer plate. In this way, the mounting structure for a bearing with an integrated rotation sensor can improve the ease of mounting the bearing with an attached retainer plate to the housing.

[0009] The mounting structure for a bearing with an integrated rotation sensor according to the present invention may be [3] "the mounting structure for a bearing with an integrated rotation sensor according to the above [1] or [2], wherein the sensor stator is fitted into the inner diameter surface of the outer ring." In this case, the sensor stator can be easily mounted to the outer ring with a simple configuration, without using a mounting member for mounting the sensor stator to the outer ring.

[0010] The mounting structure for a bearing with an integrated rotation sensor according to the present invention may be [4] "the mounting structure for a bearing with an integrated rotation sensor according to the above [3], wherein a shield is provided between the sensor stator and the rolling elements in a direction along the bearing center line of the bearing, and a shield groove is provided on the inner diameter surface of the outer ring between the outer ring raceway surface on which the rolling elements roll and a fitting surface into which the sensor stator is fitted, and the shield is attached to the outer ring by being fitted into the shield groove." In this way, by providing a shield between the sensor stator and the rolling elements, a lubricant such as grease filled around the rolling elements can be retained around the rolling elements, thereby improving lubrication performance.

[0011] The mounting structure for a bearing with an integrated rotation sensor according to the present invention may be [5] "the mounting structure for a bearing with an integrated rotation sensor according to any one of [1] to [4] above, wherein the fixing device includes a bolt, and the bolt has a bolt shank passed through a through hole provided in the housing and a tip end of the bolt shank inserted into and engaging with a threaded hole provided in the retainer plate, thereby fixing the retainer plate to the housing, or the bolt shank is passed through a through hole provided in the retainer plate and a tip end of the bolt shank inserted into and engaging with a threaded hole provided in the housing, thereby fixing the retainer plate to the housing." In this case, the retainer plate can be easily fixed to the housing using the bolt as the fixing device so that the outer ring is sandwiched between them. [Effects of the Invention]

[0012] According to the present invention, the outer ring can be easily fixed to the housing, and a decrease in the detection accuracy of the rotation of the rotary shaft can be suppressed. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is an exploded perspective view of a bearing with an integrated rotation sensor used in a mounting structure for a bearing with an integrated rotation sensor according to an embodiment. [Figure 2] FIG. 2 is a front view of the rotation sensor integrated bearing of FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is an enlarged view showing the area around the engaging portion between the outer ring and the retainer plate. [Figure 5] FIG. 5 is a perspective view showing how the rotation sensor integrated bearing is attached to the housing. [Figure 6] FIG. 6 is a cross-sectional view showing the mounting structure of the rotation sensor integrated bearing. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same or corresponding elements are designated by the same reference numerals, and redundant description will be omitted.

[0015] First, we will explain the bearing with integrated rotation sensor used in the mounting structure for a bearing with integrated rotation sensor according to this embodiment. The bearing with integrated rotation sensor 1 shown in Figures 1 to 3 is attached to a housing 5 shown in Figure 5, and rotatably supports a rotating shaft 7 (see Figure 3). The bearing with integrated rotation sensor 1 can also detect the rotation of the rotating shaft 7. More specifically, the bearing with integrated rotation sensor 1 includes a bearing 2 and a sensor stator 3.

[0016] The bearing 2 rotatably supports the rotating shaft 7 relative to the housing 5. The rotating shaft 7 may be, for example, the rotating shaft of an electric motor or motor generator of a hybrid vehicle or electric vehicle. Hereinafter, the direction along (parallel to) the bearing center line A of the bearing 2 will be referred to as the axial direction, the direction perpendicular to the bearing center line A will be referred to as the radial direction, and the direction along the circumference centered on the bearing center line A when viewed from the direction along the bearing 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.

[0017] The bearing 2 includes an inner ring 21, an outer ring 22, a plurality of balls (rolling elements) 23, a cage 24, a first shield (shield) 25, and a second shield 26. The inner ring 21 is formed in an annular shape. The rotating shaft 7 passes through the inside of the inner ring 21. The inner ring 21 has an inner diameter surface 21a, an outer diameter surface 21b, and an inner ring raceway surface 21c. The inner diameter surface 21a is a surface facing inward in the radial direction. The rotating shaft 7 is fitted into the inner diameter surface 21a. The outer diameter surface 21b is a surface facing outward in the radial direction. The outer diameter surface 21b is formed with an inner ring raceway surface 21c that extends annularly in the circumferential direction. The inner ring raceway surface 21c is formed in a shape corresponding to the balls 23.

[0018] The outer ring 22 is attached to the housing 5. The outer ring 22 is formed in an annular shape. The outer ring 22 has an inner diameter surface 22a, an outer diameter surface 22b, an outer ring raceway surface 22c, and a fitting surface 22d. The outer diameter surface 22b faces outward in the radial direction. The outer diameter surface 22b is fitted into a fitting hole 5a of the housing 5 (see FIG. 6).

[0019] The inner diameter surface 22a faces inward in the radial direction. An outer ring raceway surface 22c extending annularly in the circumferential direction and a fitting surface 22d extending annularly in the circumferential direction are formed on the inner diameter surface 22a. The fitting surface 22d and the outer ring raceway surface 22c are arranged side by side in the axial direction. The outer ring raceway surface 22c is formed in a shape corresponding to the balls 23. The fitting surface 22d is a cylindrical surface extending annularly in the circumferential direction. Here, the width of the outer ring 22 is greater than the width of the inner ring 21 in the axial direction. The fitting surface 22d is formed on a portion of the inner diameter surface 22a of the outer ring 22 that protrudes from the inner ring 21 in the axial direction. In other words, the inner ring 21 is not located inside the fitting surface 22d. The sensor stator 3 is fitted into the fitting surface 22d.

[0020] Furthermore, a first engagement groove (shield groove) 22e and a second engagement groove 22f are formed in the inner diameter surface 22a of the outer ring 22. The first engagement groove 22e and the second engagement groove 22f each extend in an annular shape along the circumferential direction. The first engagement groove 22e and the second engagement groove 22f are provided so as to sandwich the outer ring raceway surface 22c in the axial direction. In this embodiment, the first engagement groove 22e is provided between the outer ring raceway surface 22c and the fitting surface 22d. The first engagement groove 22e is provided closer to the fitting surface 22d than the outer ring raceway surface 22c. The second engagement groove 22f is provided on the opposite side of the outer ring raceway surface 22c from the side where the first engagement groove 22e is provided.

[0021] 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 of the inner ring 21 and the outer ring raceway surface 22c of the outer ring 22. The plurality of balls 23 are held by the cage 24. In this way, the bearing 2 is configured as a ball bearing having the inner ring 21, the outer ring 22, the plurality of balls 23, and the cage 24. However, the bearing 2 is not limited to a ball bearing, and may be another type of rolling bearing.

[0022] The first shield 25 has an annular shape. The first shield 25 is attached to the outer ring 22 by fitting the outer peripheral edge of the first shield 25 into the first engagement groove 22e of the outer ring 22. The first shield 25 extends toward the outer diameter surface 21b of the inner ring 21. The first shield 25 is provided axially between the balls 23 and the sensor stator 3 fitted into the fitting surface 22d of the outer ring 22.

[0023] The second shield 26 has an annular shape. The second shield 26 is attached to the outer ring 22 by fitting the outer peripheral edge of the second shield 26 into the second engagement groove 22f of the outer ring 22. The second shield 26 extends toward the outer diameter surface 21b of the inner ring 21. As a result, the space around the balls 23 between the outer diameter surface 21b of the inner ring 21 and the inner diameter surface 22a of the outer ring 22 is sandwiched between the first shield 25 and the second shield 26. A lubricant such as grease is filled around the balls 23 between the first shield 25 and the second shield 26.

[0024] The first shield 25 and the second shield 26 are not limited to being attached to the outer ring 22. The first shield and the second shield may be attached to the inner ring 21. In this case, the first shield and the second shield are attached to the outer diameter surface 21b of the inner ring 21 and extend toward the inner diameter surface 22a of the outer ring 22.

[0025] The sensor stator 3 is arranged alongside the inner ring 21 and balls 23 in the direction along the bearing center line A (axial direction). The sensor stator 3 functions as the stator of a rotation sensor that detects the rotation of the rotating shaft 7. In this embodiment, the sensor stator 3, together with a rotor 9 (see FIGS. 5 and 6) provided on the rotating shaft 7, constitute a resolver as a rotation sensor. The sensor stator 3 has an annular shape that surrounds the rotating shaft 7. The sensor stator 3 is arranged so as to surround the rotor 9 provided on the rotating shaft 7. Note that the sensor stator 3 having an annular shape also includes a state in which a portion of the annular shape is cut out. The sensor stator 3 having an annular shape also includes a configuration in which multiple members are arranged circumferentially so as to surround the rotating shaft 7.

[0026] The rotor 9 mounted on the rotating shaft 7 has a non-circular shape with different outer diameters at different positions in the circumferential direction so that the radial gap between the rotor 9 and the sensor stator 3 changes with rotation. As the rotor 9 rotates together with the rotating shaft 7, the radial gap between the rotor 9 and the teeth 32 mounted on the sensor stator 3 changes. This allows the sensor stator 3 to obtain a voltage according to the rotation angle of the rotating shaft 7 through the coils 33 wound around the teeth 32.

[0027] More specifically, the sensor stator 3 has a main body 31, a plurality of teeth 32, a plurality of coils 33 (see FIG. 2), and a connector 34. The main body 31 has an annular shape. The sensor stator 3 is attached to the outer ring 22 by fitting the main body 31 into a fitting surface 22d provided on the inner diameter surface 22a of the outer ring 22. For example, the main body 31 is attached to the outer ring 22 by being press-fitted into the fitting surface 22d of the outer ring 22. However, the main body 31 may be attached to the outer ring 22 by a method other than being press-fitted into the fitting surface 22d.

[0028] The teeth 32 protrude radially inward from the inner diameter surface of the main body 31. The teeth 32 are arranged at predetermined intervals along the circumferential direction so as to surround the rotor 9 provided on the rotating shaft 7. The main body 31 and the teeth 32 are formed, for example, from electromagnetic steel plates.

[0029] The plurality of coils 33 are provided on the plurality of teeth 32, respectively. As an example, the connector portion 34 protrudes radially outward from the main body portion 31 and extends radially outward beyond the outer ring 22. The connector portion 34 is provided with a plurality of terminals connected to the coils 33. Note that the connector portion 34 is not limited to being provided so as to protrude radially outward. For example, the connector portion 34 may be provided so as to protrude in the axial direction from the main body portion 31. A voltage corresponding to the rotation angle obtained by the coils 33 as the rotating shaft 7 rotates is led out of the sensor stator 3 via the terminals provided on the connector portion 34 and is used to detect the rotation angle of the rotating shaft 7.

[0030] As shown in Fig. 5, the housing 5 is provided with a notch 5b to avoid interference with the connector portion 34 of the rotation sensor integrated bearing 1. The rotation sensor integrated bearing 1 is attached to the housing 5 by fitting the connector portion 34 into the notch 5b of the housing 5 and fitting the outer diameter surface 22b of the outer ring 22 into the fitting hole 5a of the housing 5. The shape of the housing 5 shown in Fig. 5 is an example, and the housing 5 may have a shape different from that shown in Fig. 5.

[0031] In the mounting structure for the bearing 1 with integrated rotation sensor according to this embodiment, the bearing 1 with integrated rotation sensor is mounted to the housing 5 using a retainer plate 4 and bolts 6. The retainer plate 4 is used to fix the outer ring 22 of the bearing 2 that constitutes the bearing 1 with integrated rotation sensor to the housing 5.

[0032] The retainer plate 4 is attached to the outer ring 22. A fitting hole 4a is provided in the retainer plate 4. The outer ring 22 of the bearing 2 is fitted into the fitting hole 4a of the retainer plate 4. Engagement claws 4c protruding radially inward are provided on the inner peripheral surface 4b of the fitting hole 4a. In the present embodiment, three engagement claws 4c are provided, for example. However, the number of engagement claws 4c is not limited to three. For example, the multiple engagement claws 4c may be provided at equal intervals in the circumferential direction. Furthermore, a fitting portion 22g is provided on the outer diameter surface 22b of the outer ring 22 of the bearing 2, and fitted into the fitting hole 4a of the retainer plate 4. A claw engagement groove 22h is formed on the surface of the fitting portion 22g facing radially outward. In other words, the surface of the fitting portion 22g on which the claw engagement groove 22h is formed is the surface facing the inner peripheral surface 4b of the fitting hole 4a of the retainer plate 4. In this embodiment, the pawl engagement groove 22h extends in an annular shape along the circumferential direction.

[0033] As shown in FIG. 4 , when the fitting portion 22g of the outer ring 22 of the bearing 2 is fitted into the fitting hole 4a of the retainer plate 4, the engagement claws 4c of the retainer plate 4 are fitted into the claw engagement grooves 22h of the outer ring 22. The engagement claws 4c engage with the claw engagement grooves 22h, preventing the retainer plate 4 from falling off the outer ring 22. In this manner, the retainer plate 4 is attached to the outer ring 22 by fitting the fitting hole 4a into the claw engagement grooves 22h. Furthermore, the claw engagement grooves 22h provided in the outer ring 22 extend along the circumferential direction. This allows the retainer plate 4 to rotate circumferentially relative to the outer ring 22. In this manner, the retainer plate 4 is attached to the outer ring 22 so as to be rotatable circumferentially relative to the outer ring 22.

[0034] For example, let us assume that the retainer plate 4 has engagement claws 4c formed in advance. In this case, the outer ring 22 may be pushed into the fitting hole 4a of the retainer plate 4 while elastically deforming the engagement claws 4c, thereby fitting the engagement claws 4c into the claw engagement grooves 22h. Alternatively, let us assume that the retainer plate 4 does not have engagement claws 4c formed in it. In this case, first, the outer ring 22 of the bearing 2 is fitted into the fitting hole 4a of the retainer plate 4. Next, as shown in FIG. 4, the edge of the fitting hole 4a of the retainer plate 4 may be pressed and crimped with a jig 8, thereby forming the engagement claws 4c that fit into the claw engagement grooves 22h.

[0035] As shown in FIG. 3, the fitting portion 22g provided on the outer ring 22 has an abutment surface 22g1 and an outer diameter surface 22g2. The outer diameter surface 22g2 faces radially outward and is the surface on which the pawl engagement grooves 22h are formed. The abutment surface 22g1 is a surface that extends radially outward from the end of the outer diameter surface 22g2 in the axial direction on the side where the fitting surface 22d (sensor stator 3) is provided. When the retainer plate 4 is attached to the fitting portion 22g, the abutment surface 22g1 abuts against the side where the fitting surface 22d (sensor stator 3) is provided, out of both sides of the retainer plate 4 in the axial direction. In other words, the abutment surface 22g1 determines the insertion depth of the retainer plate 4 into the fitting hole 4a in the outer ring 22.

[0036] Next, the mounting structure of the bearing 1 with an integrated rotation sensor, which mounts the bearing 1 with an integrated rotation sensor to the housing 5, will be described. This mounting structure includes the bearing 1 with an integrated rotation sensor, a retainer plate 4, and bolts 6. As described above, the retainer plate 4 is attached to the bearing 1 with an integrated rotation sensor. As shown in FIGS. 5 and 6, the integrated bearing 1 with an integrated rotation sensor and the retainer plate 4 are inserted into the fitting hole 5a of the housing 5 with the sensor stator 3 side facing forward, and the outer ring 22 of the bearing 2 is fitted into the fitting hole 5a. A through hole 5d through which the rotating shaft 7 passes is provided in the bottom surface 5c of the fitting hole 5a of the housing 5. The bottom surface 5c of the fitting hole 5a determines the insertion depth of the outer ring 22 into the fitting hole 5a. In other words, of both end surfaces of the outer ring 22 in the axial direction, the end surface on the side where the sensor stator 3 is attached abuts against the bottom surface 5c of the fitting hole 5a.

[0037] Here, a through hole 5e is provided in the housing 5. The through hole 5e extends in the axial direction when the rotation sensor integrated bearing 1 is attached to the housing 5. A threaded hole 4d is provided in the retainer plate 4. When the rotation sensor integrated bearing 1 is attached to the housing 5, the threaded hole 4d in the retainer plate 4 is provided in a position that faces the through hole 5e in the housing 5 in the axial direction. In the present embodiment, as an example, three through holes 5e and three threaded holes 4d are provided. However, there is no particular limitation on the number of through holes 5e and threaded holes 4d.

[0038] The bolt shank 6a of the bolt 6 is passed through a through hole 5e provided in the housing 5. The tip of the bolt shank 6a is inserted into a threaded hole 4d provided in the retainer plate 4 and engages with threads provided on the inner peripheral surface of the threaded hole 4d. In this way, the bolt 6 fixes the retainer plate 4 to the housing 5. At this time, the bolt 6 fixes the retainer plate 4 to the housing 5 so that the outer ring 22 is sandwiched between the retainer plate 4 and the housing 5.

[0039] By attaching the bolts 6, the outer ring 22 is sandwiched in the axial direction between the bottom surface 5c of the fitting hole 5a of the housing 5 and the retainer plate 4. More specifically, the end face of the outer ring 22 on the side where the sensor stator 3 is attached and the abutment surface 22g1 of the outer ring 22 are sandwiched between the bottom surface 5c of the fitting hole 5a of the housing 5 and the retainer plate 4. In this way, the outer ring 22 is fixed to the housing 5 by being sandwiched between the retainer plate 4 and the housing 5 by the axial force of the bolts 6.

[0040] Before the bolts 6 are attached to the threaded holes 4d of the retainer plate 4, the retainer plate 4 can rotate relative to the outer ring 22. Once the bolts 6 are attached and the outer ring 22 is sandwiched between the retainer plate 4 and the housing 5, the relative rotation between the retainer plate 4 and the outer ring 22 is restricted.

[0041] As described above, in the mounting structure of the rotation sensor-integrated bearing 1, the retainer plate 4 is fixed to the housing 5 by the bolts 6. During this fixing, the outer ring 22 of the bearing 2 is sandwiched between the retainer plate 4 and the housing 5. This sandwiching secures the outer ring 22 to the housing 5. This prevents creep from occurring in the outer ring 22 of the bearing 2. By sandwiching the outer ring 22 between the retainer plate 4 and the housing 5 in this way, the outer ring 22 can be easily fixed to the housing 5.

[0042] Furthermore, the sensor stator 3 is attached to the outer ring 22 of the bearing 2. As described above, creep of the outer ring 22 is suppressed, and therefore the sensor stator 3 attached to the outer ring 22 is prevented from shifting position relative to the housing 5. In this way, the mounting structure of this rotation sensor-integrated bearing 1 makes it easy to fix the outer ring 22 to the housing 5, and can suppress a decrease in the detection accuracy of the rotation of the rotating shaft 7.

[0043] The retainer plate 4 is attached to the outer ring 22 so as to be rotatable circumferentially relative to the outer ring 22. In this case, for example, even after the outer ring 22 of the bearing 2 has been fitted into the fitting hole 5a of the housing 5, before the outer ring 22 has been fixed with the bolts 6, the retainer plate 4 can be rotated to adjust the mounting position of the retainer plate 4. In this way, the mounting structure for the bearing with integrated rotation sensor 1 can improve the ease of mounting the bearing with integrated rotation sensor 1, to which the retainer plate 4 is attached, to the housing 5.

[0044] The sensor stator 3 is fitted into a fitting surface 22d of the inner diameter surface 22a of the outer ring 22. In this case, the sensor stator 3 can be easily attached to the outer ring 22 with a simple configuration without using any attachment member for attaching the sensor stator 3 to the outer ring 22.

[0045] A first shield 25 and a second shield 26 are provided between the inner ring 21 and the outer ring 22 so as to sandwich the balls 23 in the axial direction. The first shield 25 is provided between the sensor stator 3 and the balls 23. The first shield 25 and the second shield 26 are attached to the outer ring 22 by being fitted into a first engagement groove 22e and a second engagement groove 22f, respectively, provided in the inner diameter surface 22a of the outer ring 22. Thus, in the rotation sensor-integrated bearing 1, the provision of the first shield 25 and the second shield 26 allows the lubricant, such as grease, filled around the balls 23 to be retained around the balls 23, thereby improving lubrication performance.

[0046] The retainer plate 4 is attached to the housing 5 by bolts 6. In this case, by using the bolts 6, the retainer plate 4 can be easily fixed to the housing 5 so that the outer ring 22 is sandwiched between the retainer plate 4 and the housing 5.

[0047] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, the retainer plate 4 is not limited to being attached to the outer ring 22 so as to be relatively rotatable. The sensor stator 3 is not limited to being attached to the outer ring 22 by being fitted into the fitting surface 22d of the outer ring 22. The sensor stator 3 may be attached to the outer ring 22 by other methods. The first shield 25 and the second shield 26 may be configured to be provided when necessary, for example, to retain a lubricant.

[0048] The bolt 6 may be configured to be attached to a threaded hole provided in the housing 5. Specifically, the bolt shank 6a of the bolt 6 is passed through a through-hole provided in the retainer plate 4. The tip of the bolt shank 6a is inserted into and engages with a threaded hole provided in the housing 5. Even in this case, the bolt 6 can fix the retainer plate 4 to the housing 5. Furthermore, the tip of the bolt shank 6a of the bolt 6 is not limited to being attached to the threaded hole 4d provided in the retainer plate 4 or the threaded hole provided in the housing 5. A bolt and a nut may be used as a fastener for fixing the retainer plate 4 to the housing 5. Furthermore, a fastener other than a bolt may be used as a fastener for fixing the retainer plate 4 to the housing 5. [Explanation of symbols]

[0049] 1...bearing with integrated rotation sensor, 2...bearing, 3...sensor stator, 4...retainer plate, 4d...screw hole, 5...housing, 5e...through hole, 6...bolt (fixing device), 6a...bolt shank, 7...rotating shaft, 21...inner ring, 22...outer ring, 22a...inner diameter surface, 22c...outer ring raceway surface, 22d...fitting surface, 22e...first engaging groove (shield groove), 23...ball (rolling element), 25...first shield (shield), A...bearing center line.

Claims

1. A mounting structure for mounting a rotation sensor integrated bearing to a housing, a rotation sensor integrated bearing including a bearing and a sensor stator of a rotation sensor that detects rotation of a rotating shaft; a retainer plate that fixes the outer ring of the bearing to the housing; a fastener for fastening the retainer plate to the housing; Equipped with the bearing includes an inner ring through which the rotating shaft passes, an outer ring attached to the housing, and a plurality of rolling elements disposed between the inner ring and the outer ring, the sensor stator is attached to the outer ring, The fixing device fixes the retainer plate to the housing so that the outer ring is sandwiched between the retainer plate and the housing, in a mounting structure for a bearing with an integrated rotation sensor.

2. 2. The mounting structure for a rotation sensor-integrated bearing according to claim 1, wherein the retainer plate is mounted to the outer ring so as to be rotatable relative to the outer ring in the circumferential direction.

3. 2. The mounting structure for a rotation sensor integrated bearing according to claim 1, wherein the sensor stator is fitted into the inner diameter surface of the outer ring.

4. a shield is provided between the sensor stator and the rolling elements in a direction along a bearing center line of the bearing; a shield groove is provided in the inner diameter surface of the outer ring between an outer ring raceway surface on which the rolling elements roll and a fitting surface into which the sensor stator is fitted, 4. The mounting structure for a rotation sensor-integrated bearing according to claim 3, wherein the shield is mounted to the outer ring by being fitted into the shield groove.

5. the fastener includes a bolt; The bolt is a bolt shank is passed through a through hole provided in the housing, and a tip end of the bolt shank is inserted into and engaged with a threaded hole provided in the retainer plate, thereby fixing the retainer plate to the housing; Alternatively, the mounting structure for a bearing with an integrated rotation sensor according to any one of claims 1 to 4, wherein the bolt shank is passed through a through hole provided in the retainer plate, and the tip end of the bolt shank is inserted into and engages with a threaded hole provided in the housing, thereby fixing the retainer plate to the housing.

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