JP2013108599A - Thrust race, thrust roller bearing with race, and rotation support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a structure capable of more effectively preventing occurrence of wear at a fitting part by eliminating backlash of the fitting part of an opposed member 9 and a thrust race 4d even in consideration of dimensional tolerances of respective parts.SOLUTION: The thrust race 4d includes a tabular race part 7, and an engaging projection 8 provided while being protruded from an outer circumferential edge of the race part 7 to the radial outside. At a part of the engaging projection 8, small protrusions 12, 12 are provided which protrude from an edge of the engaging projection 8. While the thrust race 4d is incorporated to the opposed member 9, the small protrusions 12, 12 are made to bite into both inner side edges in a circumferential direction of an engagement recess 11 provided at the opposed member 9 side.

Description

  The present invention relates to an improvement in a rotation support device for various rotating machines such as an automobile transmission (including an automatic transmission and a manual transmission). Specifically, the shape of the thrust roller bearing (including the thrust needle bearing) incorporated in the rotary support device and the race constituting the thrust roller bearing is improved to prevent wear of the member attached to the race. Thus, the durability of the rotation support device is improved.

  A thrust roller bearing with a race is mounted on a portion to which a thrust load is applied during operation, among rotation support portions of various machines. For example, in the case of a transmission for an automobile, a step portion provided on the rotating shaft and the axial direction of a gear disposed around the rotating shaft (the axial direction in the present specification and claims means a thrust roller with a race) A thrust roller bearing with a race is mounted between the end surface and the like, and the relative rotation between the rotating shaft and the gear is supported while supporting the thrust load applied between the rotating shaft and the gear. Is possible. Various types of thrust roller bearings with a race that can be used in such a part have been widely known, for example, as described in Patent Documents 1 to 4. FIG. 5 shows an example of a conventional structure described in Patent Document 4 among them.

  The thrust roller bearing with race 1 is formed by sandwiching a plurality of rollers 3 and 3 held by a cage 2 so as to be able to roll, in a sandwich shape by a pair of thrust races 4a and 4b. Such a thrust roller bearing 1 with a race is disposed, for example, on the end surface of the step portion 6 provided on the outer peripheral surface of the rotating shaft 5 which is the opposing member described in the claims, and around the rotating shaft 5. It is sandwiched between the axial end surfaces of a rotating member (not shown) such as a helical gear, which is also a counter member. The thrust roller bearing with race 1 enables relative rotation between the rotating member and the rotating shaft 5 while supporting a thrust load applied between the step portion 6 and the rotating member in accordance with torque transmission. .

  When the thrust roller bearing with race 1 as described above is used, when the so-called creep occurs in which both the thrust traces 4a and 4b rotate relative to the rotating shaft 5 or the rotating member, the rotation support portion is provided. The durability of various machines is impaired. That is, due to creep, the hard metal thrust race 4a (4b) may be worn against the end surface of the stepped portion 6 or the axial end surface of the rotating member, and any of these end surfaces may be worn. There is. In particular, when any one of a pair of opposing members disposed on both sides in the axial direction of the thrust rolling bearing with race 1 is made of a light alloy such as an aluminum alloy, it is based on the creep. Wear tends to be significant. And when it wears, not only it will become easy to damage the meshing part of gears and the rolling contact part of each rolling bearing by abrasion powder, but it will also become a cause of rattling in the said rotation support part.

  Patent Documents 1 and 2 describe a structure for mechanically engaging a thrust trace and an opposing member to which the thrust trace is attached as a structure for preventing creep that causes such a problem. Has been. As shown in FIG. 6 (A), the conventional anti-creep structure described in Patent Documents 1 and 2 is a thrust trace 4c made of a hard metal plate such as bearing steel or carburized steel. The thing provided with the race part 7 and the some engagement convex parts 8 and 8 is used. Of these, the race portion 7 has an annular shape and a flat plate shape, and each of the engagement convex portions 8 and 8 is provided in a state of projecting radially outward from the outer peripheral edge of the race portion 7. Further, a holding recess 10 and a plurality of engaging recesses 11 and 11 are formed on an end face in the axial direction of the opposing member 9 such as a support wall of a light alloy housing or a stator of a torque converter. Of these, the holding recess 10 has an annular shape having a shape and size capable of fitting the race portion 7 therein. The engagement recesses 11 and 11 are provided at the same pitch as the engagement protrusions 8 and 8 in a state of being recessed radially outward from the outer peripheral edge of the holding recess 10. With the thrust trace 4c attached to the opposing member 9, the race portion 7 is fitted into the holding recess 10 and the engagement projections 8 and 8 are fitted into the engagement recesses 11 and 11, respectively. Is done. In this state, the engagement recesses 11 and 11 and the engagement protrusions 8 and 8 are mechanically engaged with each other, so that the thrust trace 4c rotates relative to the opposing member 9 (creep). You can prevent things.

  However, even in the case of the conventional structure as described above, it is difficult to completely prevent the facing member 9 from being worn. The reason for this is that it is difficult to fit the engagement recesses 11 and 11 and the engagement protrusions 8 and 8 without gaps. That is, in consideration of dimensional tolerances, the fitting portions between the respective engagement concave portions 11 and 11 and the respective engagement convex portions 8 and 8 have a slight amount in the circumferential direction (rotation direction) as shown in FIG. It is inevitable that the gap δ exists. When the magnitude of torque applied to the thrust trace 5c from each of the rollers 3, 3 (see FIG. 5) changes, and further, the direction of the torque change, the thrust trace 4c and the opposing member 9 Based on the gap δ, the displacement is relatively small in the rotational direction. Then, along with this relative displacement, the circumferential inner side surfaces of the respective engagement recesses 11 and 11 and the circumferential side opposite edges of the respective engagement projections 8 and 8 are, for example, α portions in FIG. Collisions occur in a very narrow area at the base end of each engaging projection 8, 8. As a result, wear powder may be generated to some extent, and rattling of the rotation support portion may gradually increase.

JP-A-3-129122 JP-A-10-252728 JP 2007-16965 A JP 2011-27206 A

  In the thrust roller bearing with race and the thrust roller bearing with a race and the rotation support device of the present invention, in view of the above-described circumstances, even if the dimensional tolerance of each part is taken into consideration, the fitting part between the opposing member and the race has a rattling. The invention was invented to realize a structure capable of more effectively preventing the occurrence of wear at the fitting portion.

Of the thrust race bearing, the thrust roller bearing with race, and the rotation support device of the present invention, the thrust race described in claim 1 is made of a hard metal plate, and is formed in a radial direction from a flat race portion and an outer peripheral edge of the race portion. And at least one engaging projection provided in a state of protruding outward.
In particular, in the thrust trace of the present invention, a small protrusion that protrudes from an edge of the engaging protrusion is provided on a part of the engaging protrusion.

When carrying out such a thrust trace of the present invention, for example, as in the invention described in claim 2, the small protrusions are arranged on the side edges of the engaging convex portions in the circumferential direction of the race portions. Provided in a state protruding in the circumferential direction.
Alternatively, as in the invention described in claim 3, by bending the outer end portion of the engaging convex portion in the axial direction of the race portion with respect to the radial direction of the race portion, the bent portion is bent at the outer end portion. Form. And the said small protrusion is provided in the state which protrudes in this circumferential direction on the side edge of this bending raising part regarding the circumferential direction of the said race part.
Alternatively, as in the invention described in claim 4, the small protrusion is provided on the outer end edge of the engaging convex portion in a state of protruding outward in the radial direction with respect to the radial direction of the race portion.

The thrust roller bearing with a race described in claim 5 includes at least one race, a plurality of radially arranged rollers, and a cage that holds each of the rollers in a rollable manner.
In particular, in the thrust roller bearing with race of the present invention, the race is a thrust trace as described in any one of claims 1 to 4 described above.

Furthermore, the rotation support device according to claim 6 includes a pair of opposing members, at least one holding recess, an engagement recess, and a race-equipped rolling bearing.
The pair of opposing members are provided in a state in which the rotation center axes coincide with each other and face each other in the axial direction.
In addition, the holding recess includes at least one opposing member of the opposing members, that is, an axial end surface of the opposing member to which the thrust trace is attached (a step surface formed on an axially intermediate portion or a piece of a support wall) In the present specification and the entire scope of the claims, the same is applied to the other end of the opposing member. When the opposing member is made of hard metal, the thrust raceway surface may be provided directly on the end surface in the axial direction of the opposing member. In such a case, it is not necessary to form the holding recess in the opposing member. . However, when the thrust trace is attached to both of the opposing members, the holding recesses are formed in the opposing members.
The engaging recess is provided in a state of being recessed radially outward from the outer peripheral edge of the holding recess. Although at least one such engagement recess is provided, it is preferably provided at a plurality of locations (particularly preferably about 3 to 6 locations) at equal intervals in the circumferential direction.
Further, the race-equipped rolling bearing includes a race portion fitted in the holding recess and an engagement convex portion provided in a state of projecting radially outward from an outer peripheral edge of the race portion and fitted in the engagement recess. Including a thrust trace.
In particular, in the rotation support device of the present invention, the race-equipped rolling bearing is the race-equipped rolling bearing described in claim 5 above.

When implementing the rotation support device of the present invention as described above, for example, as in the invention described in claim 7, the thrust trace incorporated into the rolling bearing with race is replaced with any one of claims 2 to 3. Or the thrust trace described in item 1.
And the width dimension in the free state in the circumferential direction of the engagement recess is smaller than the width dimension in the free state in the same direction of the engagement protrusion including the small protrusion, provided that the engagement protrusion Can be pushed into the engaging recess by deforming any part (one or both of elastic deformation and plastic deformation).

Alternatively, as in the invention described in claim 8, the thrust trace incorporated in the rolling bearing with a race is the thrust trace described in claim 4.
The diameter of the circumscribed circle of the engaging recess in the free state is smaller than the diameter of the circumscribed circle of the engaging convex including the small protrusion, provided that the engaging convex is the It can be pushed in by deforming any part into the engaging recess.

According to the thrust race, the thrust roller bearing with race, and the rotation support device of the present invention configured as described above, even when considering the dimensional tolerance of each portion, the fitting portion between the opposing member and the thrust trace has a rattling. Without this, it is possible to more effectively prevent the fitting part from being worn.
That is, according to the structure of the present invention, a small protrusion formed on the inner side surface of the engaging concave portion on the opposing member side is formed on the edge of the engaging convex portion on the thrust trace side. Engage by pressing. Since the engagement length between the tip of the small protrusion and the inner surface of the engagement recess is short, even if the engagement between the tip and the inner surface is somewhat large, the engagement protrusion Can be press-fitted. As long as the engagement allowance exists, the engagement convex portion does not rattle in the engagement concave portion, and the thrust trace is prevented from repeatedly colliding with the counter member, so that the wear of the counter member is prevented. It can be prevented.

The figure corresponding to the X section of Drawing 6 (B) which shows the engaging part of a counter member and a thrust trace which shows the 1st example of an embodiment of the invention. The partial perspective view of a thrust trace part which shows three examples of the shape of a small protrusion. The figure which shows another two examples in the state seen from the same direction as FIG. The partial perspective view which shows another example similarly. The fragmentary sectional view which shows an example of the rotation support apparatus incorporating the thrust roller bearing with a race. The figure (A) which looked at the thrust trace from the axial direction which shows the conventionally known creep prevention structure, and the figure (B) which shows the state which attached this thrust trace to the opposing member. The same figure as FIG. 1 for demonstrating the reason for an opposing member to wear in the case of the conventional structure shown in FIG.

  1 to 4 show an embodiment of the present invention. The feature of the present invention is that a small protrusion protruding from the edge of the engaging protrusion is provided on a part of the engaging protrusion provided on the outer peripheral edge of the thrust trace, and the tip of the small protrusion, By engaging the inner surface of the engaging recess formed in a state of being recessed radially outward from the outer peripheral edge of the holding recess provided in the opposing member with the interference fit, the thrust trace rattles the opposing member. It is in the point of preventing. The structure and operation of the other parts include the thrust roller bearing with a race incorporating this thrust trace, and the rotation support device incorporating this thrust roller bearing with a race, and are the same as the conventionally well-known structure. Therefore, the illustration and description will be omitted or simplified, and the following description will focus on the features of this example.

  The thrust trace 4d is made of a hard metal plate, and has a flat and annular race portion 7 and a plurality of engaging convex portions provided in a state of projecting radially outward from the outer peripheral edge of the race portion 7. 8. In particular, in the thrust trace 4d of this example, the small protrusions 12 and 12 are provided on the circumferential side edges or the tip edge (radially outer edge) of the respective engaging projections 8 in the circumferential direction or diameter. It is provided in a state of protruding outward in the direction. The shape and arrangement state of each of the engaging protrusions 8 and the small protrusions 12 and 12 can be arbitrarily set within a range in which the object of the present invention can be achieved. That is, in order to assemble the race portion 7 of the thrust trace 4d into the holding recess 10 of the opposing member 9 described later, the small projections 12 and 12 will be described later when the race portion 7 is fitted into the holding recess 10. Any structure may be used as long as the contact portion between the tip of each of the small protrusions 12 and 12 and the engagement recess 11 is deformed into the engagement recess 11 (can be press-fitted).

  For example, in the case of the structure shown in FIGS. 2A to 2C, the small protrusions 12, 12 protrude in the circumferential direction on the circumferential side edges of the engagement convex portions 8. It is formed in a state. Among these, the small protrusions 12 and 12 shown in FIG. 2A have a partial cylindrical surface shape, the small protrusions 12 and 12 shown in FIG. 2B have a partial spherical shape, and the small protrusions shown in FIG. The protrusions 12 and 12 are trapezoidal. Further, in the structure shown in FIG. 3A, the small protrusions 12 are provided only on one circumferential edge of each of the engaging protrusions 8. In the structure shown in FIG. , Provided at the front end edge of each engaging projection 8. Further, in the structure shown in FIG. 4, by bending the outer end portion of each engagement convex portion 8 a in the axial direction of the race portion 7, the bent portion 13 is formed at the outer end portion. Then, small protrusions 12 and 12 are provided on both side edges in the circumferential direction of the bent raised portions 13 so as to protrude in the circumferential direction of the race portion 7.

  On the other hand, a holding recess 10 for housing the race portion 7 of the thrust trace 4d is provided on an axial end surface of the opposing member 9 such as a support wall of the housing or a stator of the torque converter to which the thrust trace 4d is to be attached. Forming. In addition, engaging recesses 11 are provided at a plurality of positions in the circumferential direction of the outer peripheral edge of the holding recess 10 so as to be recessed radially outward from the outer peripheral edge of the holding recess 10. The circumferential dimension or the radial dimension, and the depth dimension of each of the engagement recesses 11 are the shape of each of the engagement projections 8 and 8a to be assembled in each of the engagement recesses 11 and the respective small projections. 12 and 12 are regulated in relation to the installation positions and the like.

  First, as shown in (A) to (C) of FIG. 2 and (A) of FIG. 3, the small protrusions 12, 12 are provided on the circumferential side edges of the engaging protrusions 8. When combined with the thrust trace 4d, the width dimension w in the free state with respect to the circumferential direction of the respective engagement recesses 11 is set to be free in the same direction of the respective engagement projections 8 including the respective small protrusions 12 and 12. It is smaller than the width dimension W in the state (w <W). When the width dimension w related to each engaging recess 11 is made slightly smaller than the width dimension W related to each engaging protrusion 8, the lace portion 7 of the thrust trace 4d is assembled to the holding recess 10. Thus, the respective engaging projections 8 can be pushed into the respective engaging recesses 11 by deforming any part (one or both of elastic deformation and plastic deformation).

  On the other hand, as shown in FIG. 3 (B), when combined with the thrust trace 4d in which the small protrusions 12 are provided on the tip edges of the respective engaging convex portions 8, the respective engaging concave portions. The diameter d in the free state of the circumscribed circle of 11 is made smaller than the diameter D in the free state in the free state of the circumscribed circle of each of the engagement convex portions 8 including the small protrusions 12 (d <D). . The diameter d of the circumscribed circle related to each engaging recess 11 is made slightly smaller than the diameter D of the circumscribed circle related to each engaging convex portion 8, and each engaging convex portion 8 is set in each engaging recess 11. In addition, it can be pushed in by deforming any part.

  Further, as shown in FIG. 4, when combined with the thrust trace 4d in which the bent raised portion 13 is formed at the outer end portion of each engaging convex portion 8a, the shafts of the holding concave portion 10 and the respective engaging concave portions 11 are arranged. Increase the depth dimension in the direction. Specifically, the depth dimension H of each of the recesses 10 and 11 is set to be equal to or greater than the thickness dimension T of the thrust trace 4d including the bent raised portion 13 (H ≧ T). 2A to 2C and FIG. 3A show that the width dimension w related to each engagement recess 11 is smaller than the width dimension W related to each engagement protrusion 8. The bending raising portion 13 can be press-fitted into each of the engagement recesses 11 in the same manner as the case where the above structure is adopted.

  As described above, the thrust trace 4d for realizing the structure of the present invention has the small projections 12 and 12 formed on the peripheral edges of the engaging projections 8 and 8a. Are combined, the tips of the small protrusions 12 and 12 and the inner surfaces of the engagement recesses 11 are brought into strong contact with each other. For example, when the thrust trace 4d having the structure shown in FIGS. 2A to 2C is assembled to the opposing member 9, the small protrusions 12 and 12 are both inner surfaces in the circumferential direction of the engaging recesses 11. The thrust trace 4d and the opposing member 9 are not displaced relative to each other. That is, even when taking into account the dimensional tolerance of each part, it is possible to eliminate the rattling of the fitting part between the opposing member 9 and the thrust trace 4d, and to more effectively prevent the occurrence of wear at the fitting part. . In the case of the thrust trace 4d provided with the bend raising portion 13 shown in FIG. 4, wear at the fitting portion can be prevented in the same manner. Furthermore, when the thrust trace 4d having the structure shown in FIG. 3B is assembled to the opposing member 9, the small protrusions 12 are formed on the outer diameters of the inner surfaces of the engaging recesses 11. It engages so as to bite into the side edge, preventing the thrust trace 4d and the opposing member 9 from being displaced relative to each other, thereby preventing wear at the fitting portion.

DESCRIPTION OF SYMBOLS 1 Thrust roller bearing with a race 2 Cage 3 Rollers 4a, 4b, 4c, 4d Thrust trace 5 Rotating shaft 6 Step part 7 Race part 8, 8a Engaging convex part 9 Opposing member 10 Holding concave part 11 Engaging concave part 12 Small protrusion 13 Bending part

Claims (8)

  A thrust race which is made of a hard metal plate and includes a flat lace portion and at least one engaging convex portion which protrudes radially outward from the outer peripheral edge of the lace portion. A thrust trace characterized in that a small protrusion protruding from the edge of the engaging protrusion is provided on a part of the engaging protrusion.   The thrust trace according to claim 1, wherein the small protrusion is provided on a side edge of the engagement convex portion in a state of protruding in the circumferential direction with respect to the circumferential direction of the race portion.   With respect to the radial direction of the race portion, the outer end portion of the engagement convex portion is bent in the axial direction of the race portion, so that a bend-raised portion is formed at the outer end portion, and the small protrusion is formed on the race portion. The thrust trace according to claim 1, wherein the thrust trace is provided at a side edge of each of the bent raised portions with respect to the circumferential direction of the portion so as to protrude in the circumferential direction.   2. The thrust trace according to claim 1, wherein the small protrusion is provided on the outer end edge of the engagement convex portion in a state of protruding outward in the radial direction with respect to the radial direction of the race portion.   A thrust roller bearing with a race, comprising at least one race, a plurality of radially arranged rollers, and a cage for holding each of the rollers in a freely rollable manner. A thrust roller bearing with a race, characterized in that it is a thrust race described in any one of the items 4 above.   A pair of opposing members provided in a state in which the rotation center axes coincide with each other in the axial direction, and an axial end surface of at least one of the opposing members, the axis of the other opposing member A holding recess formed in a portion facing the direction end surface, at least one engaging recess provided in a state of being recessed radially outward from the outer peripheral edge of the holding recess, and fitted into the holding recess Rotation provided with a race portion and a rolling bearing with a race including a thrust race provided with an engaging convex portion fitted in the engaging concave portion and projecting radially outward from the outer peripheral edge of the race portion 6. A rotary support device according to claim 5, wherein the race-equipped rolling bearing is the race-equipped rolling bearing.   The thrust trace incorporated in the rolling bearing with a race is the thrust trace according to any one of claims 2 to 3, wherein a width dimension in a free state with respect to a circumferential direction of the engagement recess is the Including the small protrusion, the engagement protrusion is smaller than the width dimension in the free state in the same direction, and the engagement protrusion can be pushed into the engagement recess by deforming any part. The rotation support device according to claim 6.   The thrust projection incorporated in the rolling bearing with a race is the thrust trace according to claim 4, and the engagement convex portion includes a small diameter of a circumscribed circle of the engagement concave portion including the small projection. The diameter of the circumscribed circle is smaller than the free state in the free state, and the engaging convex portion can be pushed into the engaging concave portion by deforming any portion. Rotating support device.

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