JP2014020456A - Thrust roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust roller bearing capable of improving assemblability.SOLUTION: A thrust roller bearing includes raceway ring member 40, plural rollers 31 rollably disposed on a raceway surface 41 of the raceway roller member 40, and a holder 50 holding the rollers 31. On at least one of opposite side surfaces of the raceway roller member 40 and the holder 50, one or plural recessed parts 60 for negative pressure absorbed to the other side surface by negative pressure is formed.

Description

  The present invention relates to a thrust roller bearing.

Conventionally, for example, it is known that a planetary gear is assembled via a radial roller bearing and rotatable about a central axis between both support portions arranged at a predetermined interval in the axial direction disposed on the carrier of the planetary gear mechanism. It has been.
In such a planetary gear mechanism, there is a configuration in which a washer (for example, a copper washer) is interposed between both support portions of the carrier and both end faces of the planetary gear, and the thrust load of the planetary gear is received by the washer. .
Further, in order to reduce the friction loss due to the thrust load of the planetary gear, as shown in FIG. 10, a raceway ring is used instead of the washer between both the support portions 106 of the carrier 105 and both end faces of the planetary gear 110. A thrust roller bearing including a member 140, a plurality of rollers 121 arranged to be able to roll on a raceway surface on one side of the race ring member 140, and a cage 150 that holds the plurality of rollers 121 is arranged. There is something set.
In addition, as disclosed in Patent Document 1, for example, there are thrust roller bearings in which a concave portion for holding lubricating oil is provided in a pillar portion of a cage.
In addition, as disclosed in Patent Document 2, for example, there is a thrust roller bearing in which an end face of a planetary gear and a race ring member are brought into close contact by taper fitting.

JP 2008-101863 A JP 2011-196393 A

  By the way, in the thrust roller bearing shown in FIG. 10, a bearing ring member 140 and a plurality of rollers 121 are held between both support portions 106 of the carrier 105 and both end surfaces of the planetary gear 110 instead of the washer. Since the appliances 150 are individually assembled, the number of assembling steps increases and the assembling property deteriorates.

  In view of the above problems, an object of the present invention is to provide a thrust roller bearing capable of improving assemblability.

In order to solve the above-mentioned problem, a thrust roller bearing according to claim 1 of the present invention includes a bearing ring member, and a plurality of rollers arranged to roll on a raceway surface of one side surface of the bearing ring member, A thrust roller bearing comprising a cage for holding the plurality of rollers,
Of the opposite side surfaces of the race ring member and the cage, at least one member side surface is formed with one or a plurality of negative pressure generating recesses that are attracted to the side surface of the other member by negative pressure. It is characterized by.

According to the above-described configuration, in the state before the thrust roller bearing is assembled, the negative pressure generating recess is made negative pressure, so that the bearing ring member and the cage that holds the plurality of rollers by the suction force by the negative pressure, Are integrated.
In a state where the bearing ring member and the cage are integrated, for example, the bearing ring member and the cage are arranged and assembled between the support portion of the carrier and the end face of the planetary gear.
For this reason, compared with the case where a bearing ring member and a holder | retainer are each arrange | positioned separately and assembled | attached, the improvement of an assembly | attachment property can be aimed at.

  A thrust roller bearing according to a second aspect is the thrust roller bearing according to the first aspect, wherein one of the opposite side surfaces of the race ring member and the cage is formed with a negative pressure generating recess. On the side surface of the other member facing the side surface, a negative pressure release portion is formed that releases the negative pressure overlapping the negative pressure generating recess when the raceway ring member and the cage rotate relative to each other by a set angle. It is characterized by.

  According to the above configuration, when the race ring member and the cage rotate relative to each other at a set angle, the negative pressure release portion overlaps the negative pressure generating recess to release the negative pressure. For this reason, the bearing ring member and the cage are relatively rotatable.

The thrust roller bearing according to claim 3 is the thrust roller bearing according to claim 1,
The negative pressure generating recess is formed on the side surface of the cage, and the negative pressure releasing portion is formed on the side surface of the race ring member, and is a groove-like shape extending radially outward from the outer periphery of the center hole of the race ring member. It is characterized by comprising a notch-shaped negative pressure release groove.

According to the said structure, the recessed part for negative pressure generation | occurrence | production can be easily formed in the side surface of a holder | retainer simultaneously with a cage | basket | molding by the press work of a steel plate or a synthetic resin material.
Further, the negative pressure release portion can be easily formed by forming a groove-like or notched negative pressure release groove extending radially outward from the outer periphery of the center hole of the race ring member on the side surface of the race ring member. Can do.

The thrust roller bearing according to claim 4 is the thrust roller bearing according to claim 1,
The negative pressure generating recess is formed on the side surface of the cage, and the negative pressure release portion is configured by a negative pressure release hole penetrating from the side surface of the bearing ring member to the opposite side surface.

  According to the said structure, a negative pressure release part can be easily formed by forming a negative pressure release hole from the side surface of a bearing ring member to an opposite side surface.

It is explanatory drawing which simplifies and shows the planetary gear mechanism by which the thrust roller bearing which concerns on Example 1 of this invention was employ | adopted. It is a longitudinal cross-sectional view which shows the state with which the planetary gear was assembled | attached rotatably about the central axis via the radial roller bearing and the thrust roller bearing between the both support parts of the carrier of Example 1. FIG. It is a longitudinal cross-sectional view which expands and shows the relationship between the cage | basket of the thrust roller bearing of Example 1, and a bearing ring member. It is a front view which shows the cage | basket single-piece | unit of the thrust roller bearing of Example 1. FIG. It is explanatory drawing which shows the state which pressed the bottom part of the recessed part for negative pressure generation formed in the holder | retainer of the thrust roller bearing of Example 1. FIG. It is explanatory drawing which shows the state by which the recessed part for negative pressure generation of the holder | retainer of the thrust roller bearing of Example 1 was made into negative pressure, and the holder | retainer and the bearing ring member were integrated by the adsorption force by the negative pressure. It is a front view which shows the bearing ring member single-piece | unit of the thrust roller bearing of Example 1. FIG. It is a front view which shows the bearing ring member single-piece | unit of the thrust roller bearing of another embodiment. It is a longitudinal cross-sectional view which shows the state before a thrust roller bearing and a planetary gear are assembled | attached between the both support parts of the carrier of Example 1. FIG. It is a longitudinal cross-sectional view which shows the state by which the planetary gear was assembled | attached rotatably about the center axis | shaft via the radial roller bearing and the thrust roller bearing between the both support parts of the conventional carrier.

  A mode for carrying out the present invention will be described in accordance with an embodiment.

A first embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the thrust roller bearing according to the first embodiment exemplifies a case where it is employed in a planetary gear mechanism 1 disposed in an automatic transmission or the like of an automobile. In addition, the planetary gear mechanism 1 includes a sun gear 2, a ring gear 3, a plurality of (three in FIG. 1) planetary gears 10, and a carrier 5.
As shown in FIG. 2, the carrier 5 is provided with support portions 6 at predetermined intervals in the axial direction, and the planetary gear 10 can rotate around the center shaft 8 between the support portions 6. It is assembled.

As shown in FIG. 2, a radial roller bearing 20 is disposed between the center hole 11 of the planetary gear 10 and the outer peripheral surface of the center shaft 8.
The radial roller bearing 20 includes a plurality of rollers (needle) incorporated in an annular clearance between the planetary gear 10 with an inner ring surface of the center hole 11 as an outer ring raceway surface and an outer peripheral surface of the center shaft 8 as an inner ring raceway. 21) and a cage 22 that holds the plurality of rollers 21 in a rollable manner.

As shown in FIGS. 2 and 3, thrust roller bearings 30 are disposed between both support portions 6 of the carrier 5 and both end surfaces of the planetary gear 10.
The thrust roller bearing 30 has a raceway member 40 disposed on the support portion 6 side, and an end face of the planetary gear 10 as a raceway surface 12, and the raceway surface 12 and one side surface of the raceway ring member 40 facing the raceway surface 12. A plurality of rollers 31 disposed so as to be able to roll between the raceway surface 41 and a cage 50 that holds the plurality of rollers 31 are provided.

  As shown in FIG. 3, the race ring member 40 is formed by pressing a carbon steel plate, and the center portion of the race ring member 40 is fitted to the outer peripheral surface of the central shaft 8 with a slight gap. A central hole 42 to be inserted is formed.

As shown in FIGS. 3 and 4, the cage 50 of the thrust roller bearing 30 includes an inner diameter side annular portion 51 and an outer diameter side annular portion 52 that are radially spaced apart from each other, and both inner and outer diameter annular portions. 51 and 52 are connected to each other, and a plurality of column portions 54 that integrally define a plurality of pockets 53 corresponding to a plurality of rollers (including needle rollers) 31 are integrally provided.
The cage 50 is formed of a pressed product of a steel plate, a molded product made of synthetic resin having heat resistance and wear resistance, or the like, and a pawl (not shown) for retaining the roller 31 in each pocket 53 thereof. Is formed.

As shown in FIG. 3 and FIG. 4, of the opposing side surfaces of the race ring member 40 and the cage 50, the side surface of at least one member is attached to the side surface of the other member by a negative pressure or a plurality of negative surfaces. A pressure generating recess 60 is formed.
On the other hand, a negative pressure release portion 61 is formed on the side surface of the other member to overlap the negative pressure generating recess 60 and release the negative pressure when the race ring member 40 and the cage 50 rotate relative to each other by a set angle. Yes.

In the first embodiment, as shown in FIGS. 3 and 4, a plurality (four in the figure) of circular shapes are formed on the inner diameter side annular portion 51 of one side surface (side surface facing the race ring member 40) of the cage 50. Are formed at equal intervals on a predetermined arrangement pitch circle.
On the other hand, as shown in FIG. 3 and FIG. 7, the race ring member 40 and the cage 50 are set at a set angle (45 in this embodiment 1) on one side surface (side surface facing the cage 50). A plurality of groove-shaped or notched negative-pressure releasing grooves 62 constituting the negative pressure releasing portion 61 that releases the negative pressure overlapping with the negative pressure generating recess 60 when the relative rotation is performed are the center of the race ring member 40. The hole 42 is formed to extend radially outward from the outer periphery of the hole 42.

The thrust roller bearing according to the first embodiment is configured as described above.
Accordingly, the race ring member 40 and the plurality of rollers 31 are assembled before the thrust roller bearing 30 is disposed and assembled between the both support portions 6 of the carrier 5 and both end faces of the planetary gear 10. The held cage 50 is overlapped.

In this state, as shown in FIG. 5, the air in the negative pressure generating recess 60 is discharged by pressing and elastically deforming the opposite side (bottom side) of the negative pressure generating recess 60 of the cage 50. After that, the press is released.
Then, as shown in FIG. 6, the bottom of the negative pressure generating recess 60 is elastically restored to its original state, and thereby the negative pressure generating recess 60 becomes negative pressure, and the bearing ring member 40 is absorbed by the negative pressure. And the holder | retainer 50 holding the some roller 31 is integrated.
Note that when the bearing ring member 40 and the cage 50 assembled with the plurality of rollers 31 are overlapped, a lubricant such as lubricating oil is applied to both side surfaces of the bearing ring member 40 and the cage 50 facing each other. It is desirable to be applied. In this case, good adhesion between the race ring member 40 and the cage 50 is ensured.

After that, as shown in FIG. 9, the planetary gear 10 with the radial roller bearing 20 assembled is disposed between the two support portions 6 of the carrier 5, and the both end surfaces of the both support portions 6 of the carrier 5 and the planetary gear 10 are arranged. Between them, the raceway ring member 40 and the cage 50 of the thrust roller bearing 30 integrated as described above are disposed.
And as shown in FIG. 9, the center axis | shaft 8 is the bearing ring member 40 of one thrust roller bearing 30 from the one support part 6 side of the carrier 5, the retainer 50, the radial roller bearing 20, and the other. The thrust roller bearing 30 is inserted through the cage 50, the bearing ring member 40, and the other support portion 6 of the carrier 5. Then, both ends of the central shaft 8 are caulked against the both support portions 6 of the carrier 5 by caulking punches or the like, whereby the respective members are assembled integrally as shown in FIG.

  When the planetary gear mechanism 1 is in operation, when the raceway ring member 40 of the thrust roller bearing 30 and the cage 50 rotate relative to each other by a set angle (about 45 degrees in this embodiment 1) due to mutual frictional resistance, the negative pressure is released. The negative pressure release groove 62 as the portion 61 overlaps the negative pressure generating recess 60 to release the negative pressure. For this reason, the race ring member 40 and the cage 50 are relatively rotatable.

As described above, the bearing ring member 40 and the cage 50 of the thrust roller bearing 30 are integrally arranged and assembled between the support portion 6 of the carrier 5 and the end face of the planetary gear 10.
For this reason, compared with the case where the bearing ring member 40 and the holder | retainer 50 are each arrange | positioned separately and assembled | attached, the improvement of an assembly | attachment property can be aimed at.
In addition, the retainer 50 of the thrust roller bearing 30 is formed by pressing a steel plate or a synthetic resin material, and at the same time, one or more negative pressure generating recesses 60 are easily formed on the side surface of the retainer 50.
Further, the negative pressure release portion 61 is formed by forming a groove-like or notched negative pressure release groove 62 extending radially outward from the outer periphery of the center hole 42 of the race ring member 40 on the side surface of the race ring member 40. Is easily formed.

In addition, this invention is not limited to the said Example 1, In the range which does not deviate from the summary of this invention, it can also be implemented with a various form.
For example, in the first embodiment, as shown in FIG. 7, a plurality of groove-shaped or notched negative-pressure releasing grooves 62 constituting the negative pressure releasing portion 61 are formed from the outer periphery of the center hole 42 of the race ring member 40. In the example shown in FIG. 8, one or a plurality of negative pressure release holes 63 penetrating from the side surface of the race ring member 40 to the opposite side surface are formed. It is also possible to configure the negative pressure release unit 61.
In the first embodiment, the case where the negative pressure generating recess 60 is formed on one side surface of the cage 50 and the negative pressure releasing portion 61 is formed on one side surface of the race ring member 40 is exemplified. Even if the negative pressure generating recess 60 is formed on one side surface of the ring member 40 and the negative pressure releasing portion 61 is formed on one side surface of the cage 50, the present invention can be implemented.
In the first embodiment, the case where the thrust roller bearing 30 is employed in the planetary gear mechanism 1 is exemplified. However, the thrust roller bearing of the present invention is applied to a gear mechanism and a rotation mechanism other than the planetary gear mechanism 1. It is possible to adopt.

1 Planetary gear mechanism (gear mechanism)
DESCRIPTION OF SYMBOLS 5 Carrier 6 Support part 10 Planetary gear 30 Thrust roller bearing 31 Roller 40 Race ring member 41 Race surface 60 Negative pressure generation recessed part 61 Negative pressure release part

Claims (4)

A thrust roller bearing comprising a bearing ring member, a plurality of rollers arranged to be rollable on a raceway surface of one side of the bearing ring member, and a cage for holding the plurality of rollers,
Of the opposite side surfaces of the race ring member and the cage, at least one member side surface is formed with one or a plurality of negative pressure generating recesses that are attracted to the side surface of the other member by negative pressure. Thrust roller bearing characterized by. The thrust roller bearing according to claim 1,
Of the opposite side surfaces of the race ring member and the cage, the race ring member and the cage are set at a set angle on the side surface of the other member facing the side surface of the one member where the negative pressure generating recess is formed. A thrust roller bearing, wherein a negative pressure release portion is formed to release the negative pressure by overlapping with the negative pressure generating recess when relatively rotated. The thrust roller bearing according to claim 2,
The negative pressure generating recess is formed on the side surface of the cage,
The negative pressure release portion is formed by a groove-shaped or notched negative pressure release groove formed on a side surface of the race ring member and extending radially outward from the outer periphery of the center hole of the race ring member. And thrust roller bearing. The thrust roller bearing according to claim 2,
The negative pressure generating recess is formed on the side surface of the cage,
The thrust roller bearing, wherein the negative pressure release portion is constituted by a negative pressure release hole penetrating from the side surface of the bearing ring member to the opposite side surface.

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