Rotary sensor integrated bearing

Abstract

To inhibit deterioration of detection accuracy of rotation of a rotary shaft.SOLUTION: A rotation sensor integrated bearing 1 includes: a bearing 2 supporting a rotary shaft 6; a sensor stator 3 configured to detect rotation of the rotary shaft 6; and a connection part 4 having a first engagement part 41 configured to engage with the outer ring 22 of the bearing 2 and a second engagement part 42 configured to engage with the sensor stator 3. The first engagement part 41 is fitted in the engagement groove 22d of the outer ring 22 so that the connection part 4 may rotate relative to the outer ring 22.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a rotation sensor integrated bearing.

Background Art

[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 rotation direction) of the sensor stator that detects the rotation of the rotating shaft is displaced, the detection accuracy of the rotation decreases. Therefore, in the rotation sensor described in Patent Document 1, the stator core of the sensor stator is fixed to the housing with a plurality of bolts.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, it is conceivable to integrate the sensor stator of the rotation sensor and the outer ring of the bearing to form a rotation sensor integrated bearing. When attaching this rotation sensor integrated bearing to a housing, it is conceivable to fit the outer diameter surface of the outer ring into the fitting portion of the housing, similar to a general bearing. However, if creep occurs in the outer ring of the bearing, the sensor stator attached to the bearing will also rotate with respect to the housing. As a result, the reference position with respect to the housing changes, so it is conceivable that the detection accuracy of the rotation of the rotating shaft in the rotation sensor integrated bearing decreases.

[0005] Therefore, an object of the present invention is to provide a rotation sensor integrated bearing capable of suppressing a decrease in the detection accuracy of the rotation of a rotating shaft.

Means for Solving the Problems

[0006] The rotation sensor integrated bearing of the present invention is "[1] a bearing for supporting a rotating shaft, a sensor stator of a rotation sensor that is arranged adjacent to the bearing in a direction along the bearing center line of the bearing and detects the rotation of the rotating shaft, and a connecting portion that has an annular shape centered on the connecting portion center line and has a first engaging portion that engages with the outer ring of the bearing and a second engaging portion that engages with the sensor stator. The bearing is provided with an engaging groove that extends along the circumferential direction at a portion on the inner diameter surface of the outer ring on the sensor stator side with respect to the rolling elements of the bearing. The outer diameter surface of the first engaging portion has a shape that protrudes outward in the radial direction. The first engaging portion is fitted into the engaging groove so that the connecting portion can rotate relative to the outer ring. Rotation sensor integrated bearing."

[0007] In this rotation sensor integrated bearing, the outer ring of the bearing and the connecting portion that connects the sensor stator to the outer ring are relatively rotatable. For this reason, even if creep occurs in the outer ring of the bearing, it is possible to suppress the displacement of the position of the sensor stator being pulled by the outer ring. Thus, the rotation sensor integrated bearing can suppress a decrease in the detection accuracy of the rotation of the rotating shaft.

[0008] The rotation sensor integrated bearing of the present invention may also be "[2] the rotation sensor integrated bearing according to [1] above, wherein a predetermined gap is provided between the outermost diameter portion of the first engaging portion and the inner wall surface of the engaging groove in a state where the connecting portion center line and the bearing center line coincide with each other, and the outermost diameter portion is the portion located most outward in the radial direction of the outer diameter surface." In this case, there is a gap between the connecting portion and the outer ring in the radial direction. As a result, the connecting portion and the outer ring can rotate relative to each other more easily.

[0009] The rotation sensor integrated bearing of the present invention may be "[3] The rotation sensor integrated bearing according to [2] above, wherein in a state where the center line of the connecting portion coincides with the center line of the bearing and the connecting portion is pressed against the rolling element side of the bearing, a predetermined gap is provided between the portion of the outer diameter surface from the outermost diameter portion to the sensor stator side and the inner wall surface of the engaging groove." In this case, there is a gap between the connecting portion and the outer ring in the direction along the bearing center line (connecting portion center line). As a result, the connecting portion and the outer ring can rotate relative to each other more easily.

[0010] The rotation sensor integrated bearing of the present invention may be "[4] The rotation sensor integrated bearing according to any one of [1] to [3] above, wherein the first engaging portion is curved toward the bottom of the engaging groove so that at least a part of the outer diameter surface enters the engaging groove." In this case, the first engaging portion of the connecting portion can be easily formed by bending.

[0011] The rotation sensor integrated bearing of the present invention may be "[5] The rotation sensor integrated bearing according to any one of [1] to [4] above, wherein the outer ring has a receiving surface extending radially inward from the edge portion on the rolling element side of the bearing in the engaging groove, and the receiving surface receives the portion of the connecting portion on the bearing side so that the connecting portion can rotate relative to the outer ring." Thereby, when forming the first engaging portion, by pressing and bending the end portion of the connecting portion against the receiving surface of the outer ring with a jig, the first engaging portion protruding radially outward can be easily formed.

Advantages of the Invention

[0012] According to various aspects of the present invention, it is possible to suppress a decrease in the detection accuracy of the rotation of the rotating shaft.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same or corresponding elements are denoted by the same reference numerals, and duplicate descriptions are omitted.

[0015] As shown in FIGS. 1 and 2, the rotation sensor integrated bearing 1 is attached to the housing 5 and rotatably supports the rotating shaft 6. Further, the rotation sensor integrated bearing 1 can detect the rotation of the rotating shaft 6. More specifically, the rotation sensor integrated bearing 1 includes a bearing 2, a sensor stator 3, and a connecting portion 4.

[0016] The bearing 2 rotatably supports the rotating shaft 6 with respect to the housing 5 (see FIG. 2). The rotating shaft 6 may be, for example, the rotating shaft of an electric motor or a motor generator of a hybrid vehicle or an electric vehicle. Hereinafter, the direction parallel to the bearing center line A of the bearing 2 is referred to as the axial direction, the direction perpendicular to the bearing center line A is referred to as the radial direction, and the direction along the circumference centered on the bearing center line A when viewed from the direction parallel to the bearing center line A is referred to as the circumferential direction. That is, the radial direction is the radial direction of the bearing 2. The circumferential direction is the rotation 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, and a cage 24. The inner ring 21 is formed in an annular shape. The rotating shaft 6 is fitted into the inner diameter surface 21a of the inner ring 21. An inner ring raceway surface 21c extending annularly along the circumferential direction is formed on the outer diameter surface 21b of the inner ring 21. The inner ring raceway surface 21c is formed in a shape corresponding to the ball 23.

[0018] The outer ring 22 is formed in an annular shape. On the inner diameter surface 22a of the outer ring 22, an outer ring raceway surface 22c extending annularly along the circumferential direction is formed. The outer ring raceway surface 22c is formed in a shape corresponding to the balls 23. The outer diameter surface 22b of the outer ring 22 is fitted into the fitting portion 5a of the housing 5. Further, an engagement groove 22d is formed on the inner diameter surface 22a of the outer ring 22. In the present embodiment, the engagement groove 22d extends annularly along the circumferential direction. The engagement groove 22d is provided on the sensor stator 3 side with respect to the outer ring raceway surface 22c. That is, the engagement groove 22d is provided on the sensor stator 3 side with respect to the balls 23.

[0019] Each of the plurality of balls 23 is formed in a spherical shape. The plurality of balls 23 are arranged between the inner ring raceway surface 21c and the outer ring raceway surface 22c. The plurality of balls 23 are held by a cage 24. Thus, the bearing 2 is configured as a ball bearing having an inner ring 21, an outer ring 22, a plurality of balls 23, and a cage 24. However, the bearing 2 is not limited to a ball bearing and may be another type of rolling bearing.

[0020] The sensor stator 3 is arranged adjacent to the bearing 2 in the direction (axial direction) along the bearing center line A. The sensor stator 3 functions as a stator of a rotation sensor that detects the rotation of the rotating shaft 6. In the present embodiment, the sensor stator 3 and a rotor 7 provided on the rotating shaft 6 constitute a resolver as a rotation sensor. The sensor stator 3 is arranged on the outer side in the radial direction of the rotor 7 with a radial gap (gap) C therebetween. The rotor 7 rotates together with the rotating shaft 6. The rotor 7 has a non-circular shape with different outer diameter dimensions over the circumferential direction so that the radial gap C with the sensor stator 3 changes due to rotation. As the rotating shaft 6 rotates, the rotor 7 rotates, and the radial gap C between the teeth 32 provided on the sensor stator 3 and the rotor 7 changes. Thereby, the sensor stator 3 can obtain a voltage corresponding to the rotation angle of the rotating shaft 6 by the coil 35 wound around the teeth 32.

[0021] More specifically, the sensor stator 3 includes a stator core 31, a plurality of teeth 32, a first insulator 33, a second insulator 34, and a plurality of coils 35. The stator core 31 has a substantially annular shape. The plurality of teeth 32 project radially inward from the inner peripheral surface of the stator core 31. The plurality of teeth 32 are arranged at predetermined intervals along the circumferential direction. The stator core 31 and the teeth 32 are made of electromagnetic steel sheets. Also, the stator core 31 and the teeth 32 may be formed by laminating a plurality of electromagnetic steel sheets in the axial direction.

[0022] The first insulator 33 and the second insulator 34 are provided so as to sandwich the stator core 31 and the teeth 32. The coil 35 is wound around the teeth 32 via the first insulator 33 and the second insulator 34. That is, the coil 35 is held by the first insulator 33 and the second insulator 34. The plurality of coils 35 are arranged at predetermined intervals along the circumferential direction. As described above, the coil 35 detects the rotation of the rotor 7 provided on the rotating shaft 6 by generating a voltage corresponding to the 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 (such as synthetic resin). The first insulator 33 and the second insulator 34 electrically insulate the teeth 32 and the coil 35. In the present embodiment, the second insulator 34 is provided on the bearing 2 side with respect to the first insulator 33.

[0023] In addition, the sensor stator 3 is provided with a connector portion 36. In the present embodiment, the connector portion 36 is provided on the second insulator 34. The connector portion 36 projects outward in the radial direction as an example and extends radially outward beyond the outer ring 22. A plurality of terminals connected to the coil 35 are provided on the connector portion 36. Note that the connector portion 36 is not limited to being provided so as to project outward in the radial direction. For example, the connector portion 36 may be provided so as to project axially from the first insulator 33.

[0024] The connector portion 36 includes a plurality of terminals and a connector body portion that supports the plurality of terminals. For example, the connector body portion is formed of a resin material having insulating properties, similar to the second insulator 34. The voltage corresponding to the rotation angle obtained by the coil 35 as the rotary shaft 6 rotates is led out of the sensor stator 3 through the terminals provided on the connector portion 36 and is used to detect the rotation angle of the rotary shaft 6.

[0025] The sensor stator 3 is fixed to the housing 5 so as not to rotate with respect to the housing 5. Various fixing methods can be adopted for this. Thereby, the sensor stator 3 can accurately detect the rotational position of the rotary shaft 6.

[0026] The connecting portion 4 connects the bearing 2 and the sensor stator 3. Thereby, the sensor stator 3 is supported (held) by the bearing 2 via the connecting portion 4. Thus, in the rotary sensor integrated bearing 1, the sensor stator 3 is attached to the bearing 2 by the connecting portion 4. In the present embodiment, the connecting portion 4 connects the outer ring 22 of the bearing 2 and the sensor stator 3. The connecting portion 4 is formed of a metal material as an example. However, the connecting portion 4 may be formed of a material other than metal. The connecting portion 4 has an annular shape centered on the connecting portion center line B. The connecting portion 4 is disposed outside a plurality of coils 35 arranged along the circumferential direction.

[0027] The connecting portion 4 includes a first engaging portion 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 centered on the connecting portion center line B. The outer diameter of the main body portion 43 is 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 have a tapered shape. In the present embodiment, the main body portion 43 has a larger diameter at the end where the first engaging portion 41 is provided than at the end where the second engaging portion 42 is provided.

[0028] The first engaging portion 41 is provided at the end of the main body portion 43 on the bearing 2 side. In the present embodiment, three first engaging portions 41 are provided at predetermined intervals along the circumferential direction. However, the number of the first engaging portions 41 is not limited to three. For example, the first engaging portions 41 may be provided over the entire circumferential range. Also, the first engaging portions 41 may be provided so as to be arranged at unequal intervals along the circumferential direction. The first engaging portion 41 engages with the outer ring 22 of the bearing 2. More specifically, the first engaging portion 41 is fitted into the engaging groove 22d so that the connecting portion 4 can rotate relative to the outer ring 22. Details of the shape of the first engaging portion 41 and the engaging state with the outer ring 22 will be described in detail later.

[0029] The second engaging portion 42 is provided at the 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.

[0030] In this way, the second engaging 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 engaging portion 41 provided at the other end of the connecting portion 4 engages with the engaging groove 22d of the outer ring 22. Thereby, the bearing 2 and the sensor stator 3 are connected to each other by the connecting portion 4.

[0031] Next, the details of the first engaging portion 41 of the connecting portion 4 and the details of the engagement between the first engaging portion 41 and the engaging groove 22d of the outer ring 22 will be described. As shown in FIG. 3, the outer diameter surface S1 of the first engaging portion 41 has a shape that protrudes outward in the radial direction. The outer diameter surface S1 is the surface of the first engaging portion 41 that faces the outer side in the radial direction. That is, the outer diameter surface S1 is the surface that faces the inner wall surface S2 of the engaging groove 22d. The first engaging portion 41 is curved toward the bottom of the engaging groove 22d so that at least a part of the outer diameter surface S1 enters the engaging groove 22d. The outer diameter surface S1 is curved toward the bottom of the engaging groove 22d, for example, in a substantially arc shape or a substantially bow shape.

[0032] The first engaging portion 41 has a first part 41a, a second part 41b, and a third part 41c. The first part 41a projects outward in the radial direction from the end on the ball 23 side in the main body portion 43 of the connecting portion 4. The second part 41b is connected to the outer end in the radial direction of the first part 41a. The connection portion between the first part 41a and the second part 41b is curved in a substantially arc shape.

[0033] The second part 41b extends from the connection portion with the first part 41a toward the second engaging portion 42 side. The third part 41c is connected to the end on the second engaging portion 42 side of the second part 41b. The third part 41c extends from the connection portion with the second part 41b toward the first part 41a side so as to face the inner surface in the radial direction of the second part 41b.

[0034] Thus, the second part 41b and the third part 41c have a folded-back shape that goes from the outer end in the radial direction of the first part 41a toward the second engaging portion 42 and then toward the first part 41a (ball 23) side. The outer diameter surface S1 of the first engaging portion 41 is constituted by the surface that faces the outer side in the radial direction of the second part 41b.

[0035] The engaging groove 22d has a pair of groove portions 22e and 22f extending along the circumferential direction. The groove portions 22e and 22f are located on both sides in the width direction of the engaging groove 22d. The groove portion 22e is the groove portion on the ball 23 side in the engaging groove 22d. The groove portion 22f is the groove portion on the second engaging portion 42 side in the engaging groove 22d. The engaging groove 22d is formed between the groove portion 22e and the groove portion 22f on the inner diameter surface 22a of the outer ring 22. Note that, on the inner diameter surface 22a of the outer ring 22, the diameter of the portion on the sensor stator 3 side of the groove portion 22f is the same as the diameter at the position of the groove portion 22f. On the inner diameter surface 22a, the portion on the sensor stator 3 side of the groove portion 22f is defined as the inlet portion 22h. The inlet portion 22h serves as an entrance when fitting the end portion on the first engaging portion 41 side of the connecting portion 4 inside the inner diameter surface 22a of the outer ring 22.

[0036] The outer ring 22 has a receiving surface 22g extending radially inward from the groove portion 22e of the engaging groove 22d. The receiving surface 22g is a surface facing the sensor stator 3 side. The receiving surface 22g receives the portion on the bearing 2 side in the connecting portion 4 so that the connecting portion 4 can rotate relative to the outer ring 22. In the present embodiment, the first portion 41a of the first engaging portion 41 is received by the receiving surface 22g. By receiving the first engaging portion 41, the receiving surface 22g restricts the connecting portion 4 from moving toward the ball 23 side.

[0037] Here, in the example shown in FIG. 3, the bearing center line A and the connecting portion center line B coincide. Also, among the outer diameter surfaces S1 of the first engaging portion 41, the portion located most radially outward is defined as the outermost diameter portion S1a. In this state, a predetermined gap is provided in the radial direction between the outermost diameter portion S1a of the first engaging portion 41 and the inner wall surface S2 of the engaging groove 22d.

[0038] Also, in the example shown in FIG. 3, the bearing center line A and the connecting portion center line B coincide with each other, and the connecting portion 4 is pressed against the ball 23 side of the bearing 2. In the present embodiment, by being pressed against the connecting portion 4 side, the first portion 41a of the first engaging portion 41 comes into contact with the receiving surface 22g of the outer ring 22. In this state, a predetermined gap is provided between the portion on the sensor stator 3 side from the outermost diameter portion S1a of the outer diameter surface S1 of the first engaging portion 41 and the inner wall surface S2 of the engaging groove 22d.

[0039] A tapered surface portion S2a is provided on the inner wall surface S2 of the engaging groove 22d. The tapered surface portion S2a is inclined so as to gradually separate from the bearing center line A from the edge portion 22f of the engaging groove 22d toward the bottom side of the engaging groove 22d. In the present embodiment, as an example, the tapered surface portion S2a is linearly inclined so as to gradually separate from the bearing center line A. As shown in FIG. 3, in a state where the bearing center line A and the connecting portion center line B coincide with each other and the connecting portion 4 is pressed against the ball 23 side of the bearing 2, a predetermined gap is provided between the tapered surface portion S2a and the outer diameter surface S1 of the first engaging portion 41.

[0040] Here, regarding the connecting portion 4, let the length (radius of the outermost diameter portion S1a) from the connecting portion center line B of the connecting portion 4 to the outermost diameter portion S1a of the first engaging portion 41 be D. Regarding the outer ring 22, let the length (radius of the entrance portion 22h (edge portion 22f)) from the bearing center line A to the entrance portion 22h be L1. Regarding the engaging groove 22d of the outer ring 22, let the length (radius of the bottom) from the bearing center line A to the bottom of the engaging groove 22d be L2. In this case, the length D, the length L1, and the length L2 satisfy the following formula (1). L1 < D < L2 ··· (1)

[0041] In this way, the first engaging portion 41 of the connecting portion 4 is fitted into the engaging groove 22d of the outer ring 22 so as to form a gap. Further, even when the position of the connecting portion 4 is displaced in the radial direction with respect to the outer ring 22, the outer diameter surfaces S1 of all the first engaging portions 41 provided on the connecting portion 4 enter into the engaging groove 22d of the outer ring 22. That is, the connecting portion 4 does not fall off from the outer ring 22 in the axial direction. The connecting portion 4 is engaged with the outer ring 22 by the first engaging portion 41 being fitted into the engaging groove 22d of the outer ring 22 with a gap. Thereby, the outer ring 22 and the connecting portion 4 can rotate relative to each other about the bearing center line A (connecting portion center line B).

[0042] Next, an example of a method for forming the first engaging portion 41 of the connecting portion 4 will be described. Here, it is assumed that the connecting portion 4 is formed of a metal material that can be bent. As shown in FIG. 4, a bending element Y is provided at an end of the main body portion 43 on the side where the first engaging portion 41 is formed. The bending element Y becomes the first engaging portion 41 by being subjected to bending processing. The bending element Y includes a first element Y1, a second element Y2, and a third element Y3. The first element Y1 projects radially outward from the end of the main body portion 43 on the side of the ball 23. The second element Y2 is connected to the radially outer end of the first element Y1. The second element Y2 extends from the connection portion with the first element Y1 toward the second engaging portion 42 side. The connection portion K1 between the first element Y1 and the second element Y2 is curved in a substantially arc shape.

[0043] The third element Y3 is connected to the end of the second element Y2 on the side of the second engaging portion 42. The third element Y3 extends radially inward from the connection portion with the second element Y2. The connection portion K2 between the second element Y2 and the third element Y3 is curved in a substantially arc shape. The tip of the third element Y3 is curved in a substantially arc shape toward the first element Y1 (ball 23) side.

[0044] To form the first engaging portion 41, the bending element Y is inserted from the inlet portion 22h inside the outer ring 22, and the bending element Y is brought into contact with the receiving surface 22g of the outer ring 22. In this state, the third element Y3 is urged toward the receiving surface 22g side by the jig J. Since the connecting portion K2 has an arc shape, the third element Y3 bends at the connecting portion K2 so as to overlap the radially inner surface of the second element Y2.

[0045] Further, when the third element Y3 is urged by the jig J, the second element Y2 is pressed against the receiving surface 22g side. At this time, since the connecting portion K1 has a substantially arc shape, while the end portion on the receiving surface 22g side of the second element Y2 is curved so as to contact the receiving surface 22g, the other portion of the second element Y2 moves toward the bottom side of the engaging groove 22d.

[0046] In this way, by bending the bending element Y, the first engaging portion 41 can be formed at the end of the main body portion 43. Note that the shape of the bending element Y, the shape of the jig J, etc. are preset so that the first engaging portion 41 having the above-described configuration is formed by the bending process. That is, the first engaging portion 41 can be formed by a method similar to caulking.

[0047] Further, a tapered surface portion S2a is provided in the engaging groove 22d of the outer ring 22. The tapered surface portion S2a can function as a stopper that suppresses the connecting portion K2 between the second element Y2 and the third element Y3 from entering too far into the engaging groove 22d when the bending element Y is urged by the jig J.

[0048] As described above, in this rotation sensor integrated bearing 1, the outer ring 22 of the bearing 2 and the connecting portion 4 that connects the sensor stator 3 to the outer ring 22 are relatively rotatable. For this reason, even if creep occurs in the outer ring 22 of the bearing 2, it is possible to suppress the position (position in the rotational direction) of the sensor stator 3 from shifting due to being pulled by the outer ring 22. In this way, the rotation sensor integrated bearing 1 can suppress a decrease in the detection accuracy of the rotation of the rotating shaft 6.

[0049] In a state where the bearing center line A of the bearing 2 coincides with the connecting portion center line B of the connecting portion 4, a predetermined gap is provided between the outermost diameter portion S1a of the first engaging portion 41 of the connecting portion 4 and the inner wall surface S2 of the engaging groove 22d of the outer ring 22. That is, in the radial direction, there is a gap between the first engaging portion 41 of the connecting portion 4 and the engaging groove 22d of the outer ring 22. In this case, the connecting portion 4 and the outer ring 22 can rotate relative to each other more easily.

[0050] The state is such that the bearing center line A of the bearing 2 coincides with the connecting portion center line B of the connecting portion 4, and the connecting portion 4 is pressed against the receiving surface 22g of the outer ring 22. In this state, a predetermined gap is provided between the portion of the outer diameter surface S1 of the first engaging portion 41 from the outermost diameter portion S1a toward the sensor stator 3 side and the inner wall surface S2 of the outer ring 22. In this case, in the direction along the bearing center line A (connecting portion center line B), there is a gap between the connecting portion 4 and the outer ring 22. Thereby, the connecting portion 4 and the outer ring 22 can rotate relative to each other more easily.

[0051] The first engaging portion 41 of the connecting portion 4 is curved toward the bottom of the engaging groove 22d so that at least a part of the outer diameter surface S1 enters the engaging groove 22d of the outer ring 22. In this case, the first engaging portion 41 of the connecting portion 4 can be easily formed by bending.

[0052] The outer ring 22 has a receiving surface 22g extending radially inward from the edge portion 22e of the engaging groove 22d. The outer ring 22 receives the portion of the connecting portion 4 on the bearing 2 side. Thereby, when the first engaging portion 41 is formed by bending, by pressing the end portion (bending element Y) of the connecting portion 4 against the receiving surface 22g by the jig J and bending, the first engaging portion 41 protruding radially outward can be easily formed.

[0053] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. For example, the connecting portion 4 may be formed of a metal material or may be formed of a resin material other than metal. The first engaging portion 41 of the connecting portion 4 is not limited to being formed by the bending process described above. The first engaging portion 41 may be formed by other methods. The bearing 2 is not limited to being a ball bearing. The bearing 2 may be a roller bearing or the like.

Explanation of Reference Numerals

[0054] 1... Rotation sensor integrated bearing, 2... Bearing, 3... Sensor stator, 6... Rotating shaft, 23... Ball (rolling element), 22... Outer ring, 22a... Inner diameter surface, 22d... Engaging groove, 22g... Receiving surface, 41... First engaging portion, 42... Second engaging portion, A... Bearing center line, B... Connecting portion center line, S1... Outer diameter surface, S1a... Outermost diameter portion, S2... Inner wall surface.

Claims

1. a bearing for supporting a rotating shaft, a sensor stator of a rotation sensor which is arranged adjacent to the bearing in a direction along the bearing center line of the bearing and detects the rotation of the rotating shaft, a connecting portion having an annular shape centered on a connecting portion center line, and having a first engaging portion that engages with an outer ring of the bearing and a second engaging portion that engages with the sensor stator, comprising an engaging groove extending along the circumferential direction is provided at a portion on the inner diameter surface of the outer ring on the sensor stator side rather than the rolling elements of the bearing, the outer diameter surface of the first engaging portion has a shape protruding outward in the radial direction, the first engaging portion is fitted into the engaging groove so that the connecting portion can rotate relative to the outer ring, a rotation sensor integrated bearing.

2. In a state where the connecting portion center line and the bearing center line coincide with each other, a predetermined gap is provided between the outermost diameter portion of the first engaging portion and the inner wall surface of the engaging groove, the outermost diameter portion is the portion located most outward in the radial direction of the outer diameter surface, the rotation sensor integrated bearing according to claim 1.

3. In a state where the connecting portion center line and the bearing center line coincide with each other and the connecting portion is pressed against the rolling element side of the bearing, a predetermined gap is provided between the portion on the sensor stator side from the outermost diameter portion of the outer diameter surface and the inner wall surface of the engaging groove, the rotation sensor integrated bearing according to claim 2.

4. the first engaging portion is curved toward the bottom of the engaging groove so that at least a part of the outer diameter surface enters the engaging groove, the rotation sensor integrated bearing according to any one of claims 1 to 3.

5. the outer ring has a receiving surface extending radially inward from the edge portion on the rolling element side of the bearing in the engaging groove, the receiving surface receives the portion on the bearing side in the connecting portion so that the connecting portion can rotate relative to the outer ring, the rotation sensor integrated bearing according to claim 4.

Images