JP6597002B2 - Bearing device and bearing device manufacturing method - Google Patents

Description

The present invention relates to a bearing device and a manufacturing method of the bearing device , and more particularly to a bearing device used for a rotation support portion such as a gear in a transmission or a differential device and a manufacturing method of the bearing device .

  Conventionally, as a bearing device that supports a rotating shaft provided with pulleys, gears, and the like of an automobile transmission, a rolling bearing in which a plurality of rolling elements are disposed between an inner ring and an outer ring, and an outer ring of the rolling bearing are provided. And a fixed plate that abuts against the axial end face and fixes the rolling bearing to the housing. In recent years, there has been a demand for downsizing of a transmission along with downsizing of an automobile. As a bearing device that meets such demands, a circumferential step is formed on a small-diameter step portion formed on an outer peripheral part of an axial end of a rolling bearing outer ring. There is provided a bearing device provided with a locking groove extending in the direction, forming a locking claw on the inner peripheral portion of the fixed plate fitted to the small-diameter step portion, and locking the locking claw to the locking groove. It is known (for example, see Patent Documents 1 to 3).

  9 and 10 show a bearing device 110 described in Patent Document 3, and includes a rolling bearing 130 and a substantially triangular plate-like fixing plate 140 that fixes the rolling bearing 130 to a housing (not shown). A small-diameter step portion 137 is formed on the outer circumferential portion of the axial end portion of the outer ring 131 of the rolling bearing 130. The axial length L1 of the small diameter step 137 is substantially the same as the plate thickness T1 of the fixed plate 140. On the outer peripheral surface of the small diameter step portion 137, a locking groove 137c is formed along the entire circumference in the circumferential direction.

  The fixing plate 140 includes three mounting holes 146 provided corresponding to the respective apexes of the triangle, and fitting holes 141 that fit into the small diameter step portion 137 of the outer ring 131 so as to allow relative rotation. . Three recesses 149a having a radius larger than the radius of the fitting hole 141 are formed in the inner peripheral portion of the fitting hole 141. After the small-diameter step portion 137 is fitted into the fitting hole 141, the recess A central portion in the circumferential direction of 149a is pressed in the axial direction by a punch of a press device to be plastically deformed, and a locking claw 149 protruding radially inward is formed in the inner peripheral portion of the fitting hole 141. As a result, the locking claw 149 is locked in the locking groove 137c of the small-diameter step portion 137, and the outer ring 131 and the fixing plate 140 are assembled in a non-separable and relatively rotatable state.

In the bearing device 110 described in Patent Document 3, the functions required for the locking claws 149 formed on the inner peripheral portion of the fitting hole 141 include the following.
1. The rolling bearing 130 and the fixed plate 140 are assembled inseparably.
2. The front end of the locking claw 149 does not interfere with the locking groove 137 c and does not hinder the relative rotation between the rolling bearing 130 and the fixed plate 140.
3. In the molding process of the locking claw 149, the tip of the locking claw 149 does not interfere with the outer ring 131, so that burrs that cause contamination are not generated.

  In order to satisfy such a function, it is important to suppress variation in the shape of each locking claw 149. For this reason, when the locking claw 149 is formed, it is necessary to mold the locking claw 149 with the outer ring 131 and the fixed plate 140 aligned as much as possible. When the locking claw 149 is formed, the fixed plate 140 is fitted to the small diameter step portion 137 of the outer ring 131 and positioned with the rolling bearing 130 fixed to the mold. Therefore, in order to accurately position the rolling bearing 130 and the fixed plate 140, the outer diameter of the small-diameter step portion 137 of the outer ring 131 and the inner diameter of the fitting hole 141 of the fixed plate 140 are processed with high accuracy. Specifically, the outer peripheral surface of the small-diameter stepped portion 137 is ground, and the fitting hole 141 is formed by stamping by pressing.

Japanese Patent No. 4,877,044 German Patent Application Publication No. 102004031830 JP 2014-29196 A

In order to firmly fix the rolling bearing 130 to the housing, it is necessary to increase the plate thickness T1 of the fixing plate 140 to ensure the plate strength and the female thread length of the mounting hole 146 formed by burring. There is. However, if the plate thickness T1 is increased while maintaining the axial length W1 of the outer ring 131, the axial length W3 of the outer peripheral surface 131a of the outer ring 131 is shortened, and the locking groove 137c formed in the small diameter step portion 137 is formed. Approaching the outer ring raceway 132 (the thickness of the outer ring 131 in the contact angle direction of the outer ring raceway 132 decreases), the strength (rigidity) of the outer ring 131 that backs up the outer ring raceway 132 decreases.
If the axial length L1 of the small-diameter step portion 137 is reduced in order to suppress a decrease in rigidity of the outer ring 131, the fixed plate 140 may protrude from the outer ring 131 in the axial direction and interfere with adjacent gears. If the axial length W1 of the outer ring 131 is increased, the interference can be avoided without lowering the rigidity, but the transmission has been reduced in size and weight (reduced axial distance) due to recent fuel efficiency regulations. It is difficult to expand the axial space of the device 110.

  When the axial length of the bearing device 110 is suppressed, the axial length L1 of the small-diameter step portion 137 into which the fixed plate 140 is fitted becomes small, and accordingly, the plate thickness T1 has to be reduced. On the other hand, by increasing the torque using a turbocharger such as a turbocharger, the load received by the rolling bearing 130 used for the rotation support portion of the transmission is increased. Therefore, the thrust load supported by the rolling bearing 130 increases due to the increase in torque, and it is necessary to secure the fastening force of the mounting hole 146 of the fixed plate 140. However, the plate having a small plate thickness has insufficient meat that can be formed by burring, It is difficult to ensure the strength of the internal thread that meets the required fastening force.

The present invention has been made in view of the above-described problems, and its purpose is to stably mold the locking claws while securing the rigidity of the outer ring and the strength of the fixing plate, and firmly fix the bearing to the housing. Another object of the present invention is to provide a bearing device and a method for manufacturing the bearing device .

The above object of the present invention can be achieved by the following constitution.
(1) A rolling bearing comprising an inner ring, an outer ring provided with a small-diameter stepped portion on the outer peripheral portion in the axial direction, and a plurality of rolling elements arranged to be freely rollable between the inner and outer rings,
A bearing device that is attached to the outer ring so as to be relatively rotatable, and a fixing plate for fixing the rolling bearing to the housing,
A locking groove extending in the circumferential direction is formed on the outer peripheral surface of the small diameter step portion,
The inner peripheral surface of the fixed plate is stepped with a small diameter hole portion facing the outer peripheral surface of the small diameter step portion, and a large diameter hole portion having an inner diameter larger than that of the small diameter hole portion and facing the outer peripheral surface of the outer ring. Formed into a shape,
The radial clearance between the outer peripheral surface of the small-diameter stepped portion and the small-diameter hole portion located outside the locking groove in the axial direction so that the fixing plate is guided to the outer ring by the small-diameter hole portion is the outer peripheral surface of the outer ring and the large-diameter hole. The fixing plate is provided so as to protrude radially inward from the inner peripheral portion of the fixing plate that defines the small-diameter hole, and is fixed to a plurality of engagements that are engaged with the engaging grooves. A pawl, and a first thinned portion formed on the periphery of the inner peripheral surface of the small diameter hole portion and the back surface of the fixed plate ,
The locking claw is formed by pressing the inner peripheral portion of the fixed plate in the axial direction including at least the first thinning portion and plastically deforming the inner peripheral portion so as to protrude radially inward. And
A bearing device characterized in that a part of the first thinning portion remains at the tip of the locking claw .
( 2 ) The bearing device according to (1 ), wherein the outer ring has a second thinned portion at the periphery of the outer peripheral surface of the small-diameter stepped portion and the side surface of the locking groove.
(3) a rolling bearing comprising an inner ring, an outer ring provided with a small-diameter stepped portion on the outer peripheral portion in the axial direction, and a plurality of rolling elements arranged to be freely rollable between the inner and outer rings;
A fixing plate attached to an outer ring so as to be relatively rotatable, and a fixing plate for fixing the rolling bearing to the housing;
A locking groove extending in the circumferential direction is formed on the outer peripheral surface of the small diameter step,
The inner peripheral surface of the fixed plate is provided with a small-diameter hole portion facing the outer peripheral surface of the small-diameter step portion, and a large-diameter hole portion having an inner diameter larger than the small-diameter hole portion and facing the outer peripheral surface of the outer ring. Formed with a shape,
The radial clearance between the outer peripheral surface of the small-diameter step portion and the small-diameter hole portion located axially outside the locking groove is set so that the fixing plate is guided to the outer ring by the small-diameter hole portion. Provided smaller than the radial clearance with the part, and
The fixing plate is provided so as to protrude radially inward from the inner peripheral portion of the fixing plate that defines the small-diameter hole portion, and includes a plurality of locking claws that are locked to the locking grooves,
In the fixed plate, a first thinned portion is formed on the periphery of the inner peripheral surface of the small-diameter hole and the back surface of the fixed plate,
A method for manufacturing a bearing device, wherein the locking claw is formed by pressing an inner peripheral portion of a fixed plate in an axial direction including at least a first thinning portion.

  According to the bearing device of the present invention, the small-diameter step portion is formed with a locking groove extending in the circumferential direction on the outer peripheral surface, and the inner peripheral surface of the fixed plate is a small-diameter hole fitted into the outer peripheral surface of the small-diameter step portion. And a large-diameter hole portion having an inner diameter larger than that of the small-diameter hole portion and opposed to the outer peripheral surface of the outer ring. The radial clearance between the outer peripheral surface of the small-diameter stepped portion and the small-diameter hole portion located outside the locking groove in the axial direction is such that the fixing plate is guided to the outer ring by the small-diameter hole portion. It is set smaller than the radial clearance with the part. The fixed plate is provided to protrude radially inward from the inner peripheral portion of the fixed plate that defines the small-diameter hole, and includes a plurality of locking claws that are locked in the locking groove. Therefore, the fixed plate is guided to the outer peripheral surface of the small-diameter step portion by the small-diameter hole portion, and the fixed plate and the outer ring are assembled inseparably by locking the locking claw in the locking groove. As a result, the axial length of the small-diameter stepped portion can be shortened regardless of the plate thickness of the fixed plate, and the outer ring rigidity can be ensured and the bearing can be downsized. Furthermore, since the plate thickness of the fixed plate can be increased regardless of the axial length of the small diameter step portion, it is possible to ensure the strength of the fixed plate and increase the effective screw length of the mounting hole.

  Further, the bearing device requires that the fixed plate and the bearing are not separated and relatively rotated during transportation or assembly to the transmission. For this reason, the locking claw is molded so that there is a clearance between the locking groove of the small-diameter stepped portion, but the assembly is completed by fastening the fixing plate to the transmission case (the bearing usage state). ), The locking claw is formed in a shape and position where the locking groove and the locking claw do not interfere (contact) even when the load is applied to the bearing and the fixing plate is deformed. With this configuration, it is only necessary to ensure that the locking claw is strong enough to withstand the inertial force during the transportation and assembly of the bearing device. The application range can be expanded by reducing the size of the locking claw, and the press load can be reduced (reducing assembly costs). Is possible.

The perspective view which looked at the bearing apparatus based on embodiment of this invention from the surface side. The perspective view which looked at the bearing apparatus of FIG. 1 from the back surface side. Sectional drawing of the bearing apparatus of FIG. The III section enlarged view of FIG. The fragmentary sectional view which shows the state before the latching claw creation of the bearing apparatus of FIG. The fragmentary sectional view which shows the state after the latching claw creation of FIG. It is sectional drawing for demonstrating the dimension conditions of the recessed part required for the assembly | attachment of the bearing apparatus of FIG. 3, a latching claw, and a punch. The principal part enlarged view of the bearing apparatus which concerns on a modification. The perspective view which looked at the conventional bearing apparatus from the back surface side. FIG. 10 is a cross-sectional view of the main part of FIG. 9.

  Hereinafter, a bearing device according to an embodiment of the present invention will be described in detail based on the drawings.

  As shown in FIGS. 1 to 4, the bearing device 10 includes a rolling bearing 30 and a fixing plate 40 that is relatively rotatable and non-separably assembled to the rolling bearing 30 to fix the rolling bearing 30 to the housing 60. And comprising.

  The rolling bearing 30 rolls between the outer ring 31 having the outer ring raceway 32 on the inner peripheral surface, the inner ring 33 having the inner ring raceway 34 on the outer peripheral surface, and the outer ring raceway 32 and the inner ring raceway 34 held by the cage 36. A ball 35 which is a plurality of rolling elements arranged freely. Further, sealing members 38 are disposed between the outer ring 31 and the inner ring 33 at both ends in the axial direction of the outer ring 31 to seal the rolling bearing 30.

  A small-diameter step portion 37 having a step portion outer peripheral surface 37a having a diameter smaller than the outer diameter of the outer ring 31 and a step surface 37b extending radially outward from the step portion outer peripheral surface 37a is provided on the outer peripheral portion of one end portion in the axial direction of the outer ring 31. Is formed. A locking groove 37c is formed along the entire circumference in the circumferential direction of the stepped portion outer circumferential surface 37a. In the embodiment shown in the figure, the axial inner wall of the locking groove 37c is formed continuously with the step surface 37b. However, the locking groove 37c is formed in the middle in the axial direction of the stepped outer peripheral surface 37a. May be. In this case, the axial inner wall of the locking groove 37c is formed at a position different from the step surface 37b.

  The fixed plate 40 is a substantially hexagonal plate-like member in which short sides 40a and long sides 40b are alternately arranged in the circumferential direction, and is fitted to a step portion outer peripheral surface 37a of the small diameter step portion 37 of the outer ring 31 at the center. A small-diameter hole portion 41 to be joined and a large-diameter hole portion 42 adjacent to the small-diameter hole portion 41 and having a larger inner diameter than the small-diameter hole portion 41 and opposed to the outer peripheral surface 31a of the outer ring 31 in the radial direction are formed. Has been. The large-diameter hole portion 42 is a hole having a depth L3 formed from the surface 44 side of the fixed plate 40, and a step surface 43 extending in the radial direction is formed between the small-diameter hole portion 41 and the large-diameter hole portion 42. Is formed.

  The fixed plate 40 is formed with boss portions 45 projecting toward the surface 44 side of the fixed plate 40 at three equally spaced circumferential positions corresponding to the short side 40a. A mounting hole 46 through which a fastening screw (not shown) for fixing the bearing device 10 to the housing is screwed or inserted is formed on the inner peripheral surface of the boss portion 45.

  Such a fixing plate 40 is manufactured by first pressing a small diameter hole 41 by forming a large diameter hole 42 from the surface 44 side of the fixing plate 40. Moreover, it can also manufacture by a cutting process irrespective of press work.

  On the inner peripheral surface of the small-diameter hole portion 41, concave portions 49a that are recessed in a radially outward shape in a fan shape are formed at three locations at equal intervals in the circumferential direction. A locking claw 49 that protrudes radially inward from the inner peripheral surface of the small-diameter hole 41 and that locks with the locking groove 37c of the outer ring 31 is formed at the center in the circumferential direction of the inner peripheral surface of each recess 49a. ing. The locking claw 49 is formed in a state in which the outer ring 31 and the fixed plate 40 can rotate relative to each other without interfering with the stepped outer peripheral surface 37a and the locking groove 37c of the outer ring 31. The small-diameter hole portion 41 of the present embodiment is a substantially circular hole whose inner peripheral surface excluding the locking claws 49 and the concave portions 49a is formed by a single circle.

  In addition, the taper part 48 as a 1st thinning part is previously formed in the peripheral part with the back surface 47 of the fixing plate 40 by the internal peripheral surface of the recessed part 49a formed in the small diameter hole part 41 (FIG. 5). reference). By forming the tapered portion 48 in the concave portion 49a in advance, interference with the stepped portion outer peripheral surface 37a can be reliably prevented in the formation process of the locking claw 49 described later, and the locking claw 49 can be stably attached. Can be formed.

  Here, in the bearing device 10 of the present embodiment, the outer ring 31 and the fixed plate 40 have the outer diameter of the stepped outer peripheral surface 37a of the small diameter stepped portion 37 as φ1, the inner diameter of the small diameter hole portion 41 as φ2, and the outer diameter of the outer ring 31. Is φ3, the inner diameter of the large-diameter hole 42 is φ4, the plate thickness of the fixed plate 40 is T1, and the plate thickness of the small-diameter hole 41 is T2, T1> T2 (preferably 2 × T2 ≧ T1> T2) And φ4> φ3> φ2> φ1 and 0 <φ2-φ1 <φ4-φ3.

  In other words, the radial clearance B (= (φ2−φ1) / 2) provided between the inner peripheral surface of the small diameter hole portion 41 and the step outer peripheral surface 37a of the small diameter step portion 37 is the large diameter hole of the fixed plate 40. It is smaller than the radial clearance A (= (φ4-φ3) / 2) between the portion 42 and the outer peripheral surface 31a of the outer ring 31 (B <A).

  Further, the outer peripheral surface 31a and the axial side surface 31b of the outer ring 31 are surfaces on which the housing 60 is fitted or abutted, and the small-diameter hole portion 41 of the fixed plate 40 is fitted on the step-periphery surface 37a of the small-diameter step portion 37. Since they are mating surfaces, they are usually ground and finished with high precision. On the other hand, in the present embodiment, the stepped surface 37b and the locking groove 37c do not require relatively high accuracy, and are cutting surfaces by turning.

  Next, a procedure for assembling the bearing device 10 will be described with reference to FIGS. First, the outer ring 31 is inserted into the large-diameter hole portion 42 of the fixed plate 40, and the outer peripheral surface 37a of the small-diameter step portion 37 is fitted into the small-diameter hole portion 41 of the fixed plate 40 with a predetermined radial clearance A. The fixed plate 40 is set on the rolling bearing 30 by bringing the step surface 43 of the large diameter hole portion 42 into contact with the step surface 37b of the small diameter step portion 37.

  Next, the punch 50 of the press device is disposed so as to straddle both the tapered portion 48 of the recess 49a and the back surface 47 of the fixed plate 40, and is pressed in the axial direction (left side in FIG. 5). As a result, the punch 50 is first brought into contact with the back surface 47 of the fixed plate 40 to start crushing. Subsequently, the tapered portion 48 is crushed and plastically deformed, and the locking claw 49 is radially inward, that is, a stepped portion. Projecting toward the outer peripheral surface 37a.

In the process of forming the locking claw 49, a radial clearance C larger than the radial clearance B is provided between the inner peripheral surface of the recess 49a and the step outer peripheral surface 37a of the small diameter step portion 37 ( C> B), a radial clearance is maintained between the tip of the formed locking claw 49 and the stepped outer peripheral surface 37a, and interference between the locking claw 49 and the stepped outer peripheral surface 37a is prevented. The
Furthermore, even if the punching process by the punch 50 progresses and the punch 50 reaches the lower end portion of the taper portion 48, a part of the shape of the taper portion 48 remains at the tip of the locking claw 49, and the outer peripheral surface of the step portion A clearance in the radial direction is maintained between 37a and 37a, and the locking claw 49 does not interfere with the stepped portion outer peripheral surface 37a.

Then, as shown in FIG. 6, when the punch 50 is moved to a predetermined position and the crushing process is completed, the locking claws 49 are located on both side surfaces of the locking groove 37c at intermediate positions in the axial direction of the locking groove 37c. Are formed so as to have a clearance in the axial direction between them and a clearance in the radial direction between them and the bottom of the locking groove 37c. Thereby, the latching claw 49 is latched by the latching groove 37c formed in the step part outer peripheral surface 37a, and the rolling bearing 30 and the fixed plate 40 are assembled in a state in which they are not separated and relatively rotatable.
Note that the tapered portion 48 shown in FIG. 5 may be a convex curved surface portion or a concave curved surface portion.

With reference to FIG. 7, conditions regarding the shapes of the rolling bearing 30 and the fixed plate 40 for forming the locking claw 49 without interfering with the outer ring 31 in the bearing device 10 of the present embodiment will be described. The outer diameter of the stepped portion outer peripheral surface 37a is φ1, the outer diameter of the outer ring 31 is φ3, the inner diameter of the large-diameter hole portion 42 is φ4, the inner diameter of the recess 49a is φ5, the outer diameter of the tapered portion 48 is φ6, and the outer diameter of the punch 50 Is φ7 and the inner diameter of the punch 50 is φ8, φ5 ≧ φ8> φ1, φ3> φ8, and φ3> φ5 are satisfied. Further, it is desirable to satisfy φ3 ≧ φ7 ≧ φ6.
The shape of the tapered portion 48 such as the angle and the axial length is arbitrarily set according to the thickness of the fixed plate 40 and the like.

  As described above, according to the bearing device 10 of the present embodiment, the fixed plate 40 includes the tapered portion 48 formed on the peripheral edge between the inner peripheral surface of the recess 49a and the rear surface 47 of the fixed plate 40, and is locked. Since the claw 49 includes at least the tapered portion 48 and is formed by pressing the inner peripheral portion of the fixing plate 40 in the axial direction, the locking claw 49 is stably formed while preventing interference with the outer ring 31. And the productivity of the bearing device 10 can be improved.

  Further, in the bearing device 10 of the present embodiment, a concave portion 49a is formed in the inner peripheral surface of the small diameter hole portion 41 in a state of being recessed radially outward, and between the concave portion 49a and the stepped outer peripheral surface 37a of the outer ring 31. Since the radial clearance C (= φ5-φ1) is provided, the locking claw 49 can be stably formed while preventing interference with the outer ring 31.

  Further, since the fixed plate 40 has the large-diameter hole portion 42 facing the outer peripheral surface 31a of the outer ring 31 with a predetermined radial clearance A, the small-diameter step portion 137 of the outer ring 131 of the conventional bearing device 110 is opposed to the fixed plate 40. Compared with the axial length L1 (see FIG. 10), the axial length L2 of the small diameter step portion 37 of the outer ring 31 of the present embodiment is shortened by the axial length L3 of the large diameter hole portion 42. (L2 = L1-L3). As a result, the axial length W2 of the outer peripheral surface 31a of the outer ring 31 is increased (W2> W3), so that the rigidity of the outer ring 31 is improved and the outer ring raceway 32 is deformed by the bolt axial force when the fixing plate 40 is fixed. Can be suppressed.

  In addition, the axial length (W2-L3) between the left side surface 31b of the outer ring 31 and the surface 44 of the fixed plate 40 is the same as the axial length W3 of the outer peripheral surface 131a in the conventional bearing device 110. Since there is (W3 = W2-L3), the bearing device 10 of this embodiment can be applied as it is to a conventional housing without changing the housing shape.

  Further, a corner R51 is formed between the large-diameter hole portion 42 and the step surface 43 (see FIG. 5), but between the outer peripheral surface 31a of the outer ring 31 and the inner peripheral surface of the large-diameter hole portion 42. Has a large radial clearance A, it is possible to prevent the corner R51 of the fixed plate 40 and the outer peripheral surface 31a of the outer ring 31 from interfering with each other even when the corner R51 is enlarged to alleviate stress concentration. Further, even when the chamfer 52 between the outer peripheral surface 31a and the stepped surface 37b is reduced in order to ensure the strength of the outer ring 31, interference between the corner R51 of the fixed plate 40 and the outer ring 31 can be prevented.

  When the bearing device 10 is transported or when the bearing device 10 is assembled to the housing, the fixing plate 40 and the bearing 30 are not separated and need to rotate relative to each other. It is formed in a shape with a gap between the engagement groove 37c. On the other hand, in a state where the fixing plate 40 is fastened and fixed to the housing with screws and the bearing 30 is fitted and fixed to the housing, an axial load acts on the fixing plate 40 and the fixing plate 40 is slightly deformed. Even in such a state, the locking claw 49 is formed in a position and shape that does not interfere (contact) with the groove bottom and both side walls of the locking groove 37c. With this configuration, the locking claw 49 only needs to secure strength sufficient to withstand the inertial force of the bearing 30 during transportation and assembly. Therefore, the locking claw 49 can be downsized and the application range of the bearing device 10 can be expanded. It is possible to reduce the press load (reduction in assembly cost).

FIG. 8 shows a modification of the present embodiment. In the case of this modification, the locking groove 37c of the small-diameter stepped portion 37 forms a tapered portion 39 as a second thinning portion at the periphery of the axially outer wall 37d of the locking groove 37c and the stepped portion outer peripheral surface 37a. is doing. As a result, even if the locking claw 49 is formed from the initial stage of the crushing process, the locking claw 49 is more reliably prevented from interfering with the stepped outer peripheral surface 37a of the small-diameter stepped portion 37, so that the locking groove 37c is formed.
In addition, the taper part 39 can also be made into a convex curved surface part or a concave curved surface part.

  Further, the inner peripheral surface of the large-diameter hole portion 42 is formed in a tapered surface that becomes smaller in diameter toward the step surface 43, and at the end portion on the side of the step surface 43 having the smallest diameter, the inner peripheral surface is connected to the outer peripheral surface 31 a of the outer ring 31. There is a radial clearance A between them. The radial clearance A is larger than the aforementioned radial clearance B (A> B). With this configuration, the strength of the fixing plate is ensured by relaxing the stress concentration at the portion where the thickness of the fixing plate 40 changes from the small diameter hole portion 41 to the large diameter hole portion 42.

  Note that the present invention is not limited to the above-described embodiments and modifications, and modifications, improvements, and the like can be made as appropriate.

For example, in the above-described embodiment, the case where three locking claws are formed on the inner peripheral portion of the fixed plate is illustrated, but the present invention is not limited to this, and there are two or four or more engaging claws on the inner peripheral portion of the fixed plate. A pawl may be formed.
Moreover, in the said embodiment, although the case where the locking groove was formed in the circumferential direction perimeter of the outer peripheral surface of a small diameter step part was illustrated, it is not limited to this, For example, in an outer peripheral surface of a small diameter step part, a locking claw You may make it form the some locking groove extended in the circumferential direction in the location where is formed.

DESCRIPTION OF SYMBOLS 10 Bearing apparatus 30 Rolling bearing 31 Outer ring 32 Outer ring track 31a Outer surface 33 Inner ring 34 Inner ring track 35 Ball (rolling element)
37 Small-diameter stepped portion 37a Stepped portion outer peripheral surface 37b Stepped surface 37c Locking groove 38 Sealing member 39 Tapered portion (second thinned portion)
40 fixing plate 40a short side 40b long side 41 small diameter hole part 42 large diameter hole part 43 step surface 44 surface 45 boss part 46 attachment hole 47 back surface 48 taper part (first thinning part)
49 Claw 49a Recess 50 Punch 51 Corner R
52 Chamfer 60 Housing

Claims (3)

A rolling bearing comprising an inner ring, an outer ring provided with a small-diameter stepped portion on an outer peripheral portion in an axial direction, and a plurality of rolling elements arranged to be freely rollable between the inner and outer rings;
A bearing device, which is attached to the outer ring so as to be relatively rotatable, and a fixing plate for fixing the rolling bearing to a housing,
A locking groove extending in the circumferential direction is formed on the outer peripheral surface of the small diameter step portion,
The inner peripheral surface of the fixing plate includes a small diameter hole portion facing the outer peripheral surface of the small diameter step portion, and a large diameter hole portion having an inner diameter larger than the small diameter hole portion and facing the outer peripheral surface of the outer ring. It is formed into a stepped shape,
A radial clearance between the outer peripheral surface of the small-diameter step portion and the small-diameter hole portion positioned axially outside the locking groove so that the fixing plate is guided by the small-diameter hole portion to the outer ring is the outer ring. The fixed plate is provided to project radially inward from the inner peripheral portion of the fixed plate that defines the small-diameter hole portion. A plurality of locking claws that are locked in the locking groove, and a first wall removal portion that is formed on the periphery of the inner peripheral surface of the small-diameter hole portion and the back surface of the fixed plate ,
The locking claw includes at least the first thinning portion and presses the inner peripheral portion of the fixed plate in the axial direction, so that the inner peripheral portion is plastically deformed so as to protrude radially inward. Is formed by
A part of said 1st thinning part remains in the front-end | tip part of the said latching claw, The bearing apparatus characterized by the above-mentioned . 2. The bearing device according to claim 1, wherein the outer ring has a second thinned portion at a peripheral edge between an outer peripheral surface of the small-diameter stepped portion and a side surface of the locking groove. A rolling bearing comprising an inner ring, an outer ring provided with a small-diameter stepped portion on an outer peripheral portion in an axial direction, and a plurality of rolling elements arranged to be freely rollable between the inner and outer rings;
A fixing plate attached to the outer ring so as to be relatively rotatable, and a fixing plate for fixing the rolling bearing to a housing,
A locking groove extending in the circumferential direction is formed on the outer peripheral surface of the small diameter step,
An inner peripheral surface of the fixed plate, a small diameter hole portion facing the outer peripheral surface of the small diameter step portion, and a large diameter hole portion having an inner diameter larger than the small diameter hole portion and facing the outer peripheral surface of the outer ring. It is formed in a stepped shape so as to provide,
A radial clearance between the outer peripheral surface of the small-diameter step portion and the small-diameter hole portion positioned axially outside the locking groove so that the fixing plate is guided to the outer ring by the small-diameter hole portion is defined as the outer ring. Provided smaller than the radial clearance between the outer circumferential surface of the large-diameter hole and the large-diameter hole, and
The fixing plate is provided so as to protrude radially inward from an inner peripheral portion of the fixing plate that defines the small-diameter hole portion, and includes a plurality of locking claws that are locked to the locking groove,
In the fixed plate, a first thinned portion is formed on the periphery of the inner peripheral surface of the small-diameter hole and the back surface of the fixed plate,
The method of manufacturing a bearing device, wherein the locking claw is formed by pressing an inner peripheral portion of the fixed plate in an axial direction including at least the first thinning portion.

Images