JPH01216117A - Thrust needle roller bearing - Google Patents

Abstract

PURPOSE:To combine outer and inner rings in non-separated state, and also to prevent contrary engagement at assembly by providing claw parts and hang parts on respective adherends removably fitted to the outer and inner rings. CONSTITUTION:Adherends 100, 200 which their annular parts 110, 210 and cylindrical members 120, 220 are integrally formed with synthetic resin are removably fitted at least with one of an outer race and an inner race on the opposite surface of a raceway and on the opposite surface of a retainer guide. Claw members 130 extending in the radial inner direction from the circumference of a retainer 30 while being in contact with an end surface of a flange member 12 of the outer race 10, and hang parts 140 extending from the top end of the cylindrical part 120 while increasing its diameter, are provided on the top end of the cylindrical part 120 of the adherend 100 for the outer race 10. The adherend 200 for the inner race 20 has also claw parts 230 and hang parts 240 in the same manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a non-separable thrust needle roller bearing having a reverse assembly prevention function and an axial play adjustment function.

[Conventional technology]

Conventionally, as a shell-type thrust needle roller bearing, one having a structure shown in FIG. 5 is known.

This bearing 1 has needle rollers 32 guided and held by a cage 30 disposed between an outer ring 10 and an inner ring 20 formed of annular steel plates, and the outer ring 10 has a raceway portion 1) that has an outer diameter a flange portion 12 formed by bending in the axial direction on the side peripheral edge;
The structure is such that the inner and outer circumferential edges of the retainer 30 are guided by a flange portion 22 that is bent in the axial direction on the inner circumferential edge of the raceway portion 2l of the inner ring 20.

[Problem to be solved by the invention]

When assembling the thrust needle roller bearing described above to a mating component, the axial direction is determined relative to the assembly direction, and the raceway portion 1) of the outer ring 10 is brought into contact with the thrust bearing surface 41 of the housing 40. The flange portion 12 is connected to the housing 40
The raceway part 21 of the inner ring 20 is brought into contact with the thrust bearing surface 51 of the shaft 50, and the flange part 22 is fitted to the fitting surface 52 of the shaft 50. (Fig. 5) However, since it is difficult to determine whether the axial direction is forward or reverse, the assembly may be erroneously assembled in the opposite direction as shown in Fig. 6.

If you use a bearing assembled in the opposite direction like this,
In the case of shaft rotation, between the flange portion 12 of the outer ring IO and the fitting surface 42 of the housing 40, and in the case of housing rotation, between the flange portion 22 of the inner ring 20 and the fitting surface 52 of the shaft 50.
Since sliding friction occurs between the

In order to prevent such accidents from occurring, measures are taken such as coloring the outer ring or inner ring through chemical surface treatment or attaching identification symbols to identify the correct or reverse axial orientation.
Such measures have the drawback that they not only require special processing steps and are therefore costly, but are still insufficient to completely prevent reverse assembly.

In addition, since this type of thrust needle roller bearing is used, for example, as a bearing in an automobile power transmission system, assembly sometimes requires adjustment of the axial play, and this adjustment is mainly performed on the bearing. This is done by changing the thickness of the outer or inner ring.

For this reason, it is necessary to prepare several types of outer rings or inner rings with different thicknesses as spare parts, which not only increases the number of bearing parts but also complicates the bearing assembly work. Since bending becomes difficult, there is a problem in that the cost of the product increases.

In addition, this type of thrust needle roller bearing has an outer ring,
Bearings in which the inner ring, cage, and needle rollers are inseparably joined are widely used, but in conventional bearings, tabs for retaining the cage are formed on the flanges of the outer ring and inner ring by crimping. This leads to further increase in product costs.

This invention was made in order to solve the above-mentioned problems, and ensures the function of preventing non-separation and reverse assembly, and the function of adjusting axial play during assembly. Moreover, it is an object of the present invention to provide a thrust needle roller bearing equipped with an adherend that can be achieved at low cost.

[Means to solve the problem]

The thrust needle roller bearing of the present invention is a bearing in which needle rollers guided and held by a cage are disposed in at least one of an outer ring and an inner ring, and the outer ring is formed at the outer peripheral edge of a raceway made of an annular steel plate. A flange portion for guiding the cage is formed by bending in the axial direction, and a flange portion for guiding the cage is formed by bending in the axial direction on the inner peripheral edge of the raceway portion of the inner ring made of an annular steel plate.

An adherend having an annular portion and a cylindrical portion integrally molded from a synthetic resin is removably fitted and attached to the anti-raceway surface and anti-retainer guide surface of at least one of the outer ring and the inner ring.

The tip of the cylindrical portion of the adherend for the outer ring has a claw portion that contacts the end surface of the flange portion of the outer ring and extends radially inward from the outer peripheral edge of the cage, and a claw portion that extends in the direction of extension of the tip of the cylindrical portion from the tip of the cylindrical portion. A hanging portion extending with an expanded diameter is provided.

At the tip of the cylindrical part of the adherend for the inner ring, there is a claw part that contacts the end surface of the flange part of the inner ring and extends radially outward from the inner peripheral edge of the cage, and a claw part that extends from the tip of the cylindrical part in the direction of extension of the tip of the cylindrical part. A hanging portion extending with a reduced diameter is provided.

The outer ring and inner ring described above are of only one type with a constant plate thickness for each bearing size, but at least one of the outer ring adherend and the inner ring adherend has a thickness of the annular portion. Several different types are available.

[Effect]

In this invention, by attaching an adherend made of synthetic resin to a thrust needle roller bearing with a conventional structure, the axial movement of the retainer to separate is prevented by the claws of the adherend, and the bearing parts It is possible to handle the bearing as an integrated bearing in which the bearings are inseparably connected.

In addition, when assembling to a mating part, if the axial direction is correct with respect to the assembly direction, the hanging part of the adherend will lie down along the mating surface of the mating part, and the cylindrical part of the adherend will Does not interfere with the fit of the parts. On the other hand, when the mating part is assembled in the opposite direction, the hanging part of the adherend comes into contact with the end surface that connects to the mating surface of the mating part and stands upright, resulting in normal assembly. Attachment is hindered.

In addition, when adjusting the play in the axial direction when assembling to a mating part, at least one of the outer ring adherend and the inner ring adherend should be selected from among those with different annular thicknesses. Select and use one with appropriate thickness.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a longitudinal sectional side view showing the radial upper half of a thrust needle roller bearing assembly to which the adherend of the present invention is attached.

The main body of the thrust needle roller bearing 1 shown in the figure has the same structure as the bearing shown in FIG. 5, so the same components are given the same reference numerals and repeated explanations will be omitted.

This thrust needle roller bearing 1 includes an outer ring 10 and an inner ring 20.
and adherends 100.2 each made of synthetic resin.
00 is removably attached.

The outer ring adherend 100 has an annular portion 1) 0 and a cylindrical portion 120 that is bent in the axial direction from the outer peripheral edge of the annular portion 1) 0,
The annular portion 1)0 is closely fitted to the outer surface (counter-raceway surface) of the raceway portion 1) of the outer ring 10, and the cylindrical portion 120 is fitted onto the outer ring 10.
The flange portion 12 is formed to have a shape and size that is closely fitted to the outer diameter surface (anti-retainer guide surface) of the flange portion 12 .

A claw portion 130 and a hanging portion 140 are provided at the tip of the cylindrical portion 120 of the outer ring adherend 100. Claw part 13
0 is the flange portion 12 of the outer ring lO from the tip of the cylindrical portion 120.
and extends radially inward in contact with the end surface of. Claw part 130
The radial length of the retainer 30 is set such that its inner diameter (diameter of the tip end surface) is slightly smaller than the outer diameter (diameter of the outer peripheral edge) of the retainer 30. The hanging portion 140 is the cylindrical portion 120
The diameter of the cylindrical portion 120 is increased from the distal end thereof in the extending direction of the distal end of the cylindrical portion 120 . The length of the hanging portion 140 in the generatrix direction is such that the diameter of the tip is appropriately larger than the outer diameter of the cylindrical portion 120 so that the tip extends radially outward beyond the outer diameter surface of the cylindrical portion 120. It is set to .

The inner ring adherend 200 has an annular portion 210 and a cylindrical portion 220 that is bent in the axial direction from the inner peripheral edge of the annular portion 210,
The annular portion 210 is closely fitted to the outer surface (counter-race surface) of the raceway portion 21 of the inner ring 20, and the cylindrical portion 220
The flange portion 22 is formed to have a shape and size that is closely fitted to the inner diameter surface (the anti-retainer guide surface) of the flange portion 22 .

A claw portion 230 and a hanging portion 240 are provided at the tip of the cylindrical portion 220 of this inner ring adherend 200. Claw portion 230
extends radially outward from the tip of the cylindrical portion 220 in contact with the end surface of the flange portion 22 of the inner ring 20 . The length of the claw portion 230 in the radial direction is set such that its outer diameter (diameter of the tip end surface) is slightly larger than the inner diameter (diameter of the inner peripheral edge) of the retainer 30. The hanging portion 240 extends from the tip of the cylindrical portion 220 in the direction of extension of the tip of the cylindrical portion 220 with a reduced diameter. The length of the hanging portion 240 in the generatrix direction is such that the diameter of the tip portion is appropriately smaller than the inner diameter of the cylindrical portion 220 so that the tip portion extends radially inward than the inner diameter surface of the cylindrical portion 220. It is set.

Claw portion 130 and hanging portion 1 of the above outer ring adherend 100
40, the claw portion 23O and the hanging portion 240 of the inner ring adherend 200 are the cylindrical portion 1 of the outer ring adherend 100, respectively.
20 and the cylindrical portion 220 of the inner ring adherend 200 may be provided continuously in the circumferential direction, or may be provided discontinuously at appropriate intervals.

At least one of the outer ring adherend 100 and the inner ring adherend 200 configured as described above has a respective annular portion 1.
) 0.210 with different thicknesses and prepare them as spare parts.

When the outer ring adherend 100 and the inner ring adherend 200 are attached to the main body of the thrust needle roller bearing 1, when the retainer 30 moves in the axial direction, the outer circumferential edge and the inner circumferential edge of the retainer 30
The outer ring 10. Inner ring 20,
Each component of the cage 30 and the needle rollers 32 is in a non-separable state and can be handled as an integral bearing.

FIG. 2 shows a state in which the thrust needle roller bearing assembly having the above structure is assembled to the housing 40 and the shaft 50, which are the mating parts.

When assembling to the housing 40, the axial direction of the bearing assembly with respect to the direction AC is the normal orientation in which the annular portion 1)0 of the outer ring adherend 100 is opposed to the thrust bearing surface 41 of the housing 40. In this case, the cylindrical portion 120 of the outer ring adherend 100
When fitting into the fitting surface 42 of the housing 40,
The hanging portion 140 is collapsed so that the diameter of the tip thereof is the same as that of the cylindrical portion 12.
Since the diameter is reduced to be equal to the outer diameter of 0, the cylindrical part 1
It does not interfere with the fit of 20.

Furthermore, when assembling to the shaft 50, the axial direction of the bearing assembly with respect to the direction B is the normal direction in which the annular portion 210 of the inner ring adherend 200 is opposed to the thrust bearing surface 51 of the shaft 50. In this case, when the cylindrical portion 220 of the inner ring adherend 200 is fitted to the fitting surface 52 of the shaft 50, the hanging portion 240 is collapsed so that the diameter of its tip becomes equal to the inner diameter of the cylindrical portion 220. Since the diameter is expanded to , the fitting of the inner cylinder portion 220 is not hindered.

Contrary to the above-mentioned normal assembly, if the axial direction of the bearing assembly is assembled to the housing 40 in the opposite direction to direction A, as shown in FIG. 100
When the cylindrical portion 120 of the housing 40 is fitted into the fitting surface 42 of the housing 40, the hanging portion 140 of the outer ring adherend 100 comes into contact with the end surface 43 that is connected to the axial end of the fitting surface 42 and stands up. Since the portion 120 is inverted toward the outer diameter side, fitting of the cylindrical portion 120 is hindered.

Furthermore, if the axial direction of the bearing assembly is opposite to the direction B when assembled to the shaft 50, the cylindrical portion 220 of the inner ring adherend 200 is attached to the shaft 50 as shown in FIG. When the fitting surface 52 of
2A contact and stand up, and are inverted toward the inner diameter surface of the cylindrical portion 220, which prevents the fitting of the cylindrical portion 220.

In addition, when assembling the above-mentioned bearing assembly to a mating part, if it is necessary to adjust the play in the axial direction, the outer ring adherend 100 and the inner ring adherend 20 are adjusted according to the amount of adjustment.
0 and/or either one of the annular parts 1) by selecting an appropriate one from among several types of spare parts with different thicknesses of 0.210 mm. Therefore, the outer ring 1O and the inner ring 20 of the thrust needle roller bearing 1 may each have a constant plate thickness.

In the above embodiment, a bearing was described in which needle rollers guided and held by a cage were disposed between the outer ring and the inner ring, but the present invention is not limited to the above embodiment. Even for a thrust needle roller bearing having only one of the inner ring and the outer ring, the same effects as described above can be obtained by attaching the adherend having the above structure to the outer ring or the inner ring.

〔Effect of the invention〕

As explained above, the present invention non-separably connects bearing parts by the claws of the synthetic resin adherend attached to at least one of the outer ring and the inner ring of a thrust needle roller bearing, and The hanging portion is configured to prevent the mating parts from being assembled in the opposite direction when assembled. Therefore, according to the present invention, there is no need to process retainer locking tabs on the flanges of the outer ring and the inner ring, and the axial direction of the outer ring and the inner ring can be identified with respect to the direction in which the outer ring and the inner ring are assembled to the mating parts. Since there is no need for marking, the processing process for the outer and inner rings is simplified, and the adherend, which is a synthetic resin molded product, achieves the functions of preventing non-separation and reverse assembly at low cost and reliably. can do.

In addition, in this invention, by using at least one of the outer ring adherend and the inner ring adherend with different thicknesses in the annular part, assembly to the mating part is sometimes performed in the axial direction. Since the play can be adjusted, it is only necessary to prepare one type of outer ring and inner ring with a constant thickness, which also eliminates the need to bend thick annular steel plates.
Not only will the processing costs for the outer and inner rings be significantly reduced, but the bearing assembly work will also be simplified.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view showing the upper half in the radial direction of an embodiment of the present invention, and FIG. 2 is a vertical sectional side view showing the thrust needle roller bearing assembly shown in FIG. 1 properly assembled to a mating component. ,
Figures 3 and 4 are longitudinal sectional side views showing the thrust needle roller bearing assembly shown in Figure 1 when assembled in the opposite direction, respectively, and Figure 5 is a conventional thrust needle roller bearing assembly installed as a mating part. FIG. 6 is a vertical side view showing a conventional thrust needle roller bearing assembled in the opposite direction. In the figure, 1 is a thrust needle roller bearing, 10 is an outer ring, 1).
Reference numerals 12 and 22 respectively indicate the raceway portion and flange portion of the outer ring, 20 the inner ring, and 21 and 22 the raceway portions of the inner ring. 1) 0, 120, 130 degrees, 140 are annular portions and 2 cylindrical portions of the outer ring adherends; 30 is a retainer; 32 is a needle roller; 100 is an outer ring adherend; 1) 0, 120, 130 degrees; Claw portion, hanging portion, 200 is adherend for inner ring, 210°220
．． Reference numerals 230 and 240 respectively indicate the annular portion 2, the cylindrical portion, the claw portion, and the hanging portion of the adherend for the inner ring. Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) The outer ring has a cage guiding flange bent in the axial direction on the outer periphery of the raceway made of annular steel plate, and the cage guiding flange is axially bent on the inner periphery of the raceway made of annular steel plate. A thrust needle roller bearing comprising an inner ring formed by bending in a direction, and needle rollers guided and held by a retainer disposed on at least one of the inner rings, and an anti-raceway surface of the at least one outer ring and the inner ring; An adherend whose annular part and cylindrical part are integrally molded from synthetic resin is removably fitted onto the anti-retainer guide surface, and the flange part of the outer ring is attached to the tip of the cylindrical part of the adherend for the outer ring. The cylinder of the adherend for the inner ring is provided with a claw portion extending radially inward from the outer peripheral edge of the retainer and a hanging portion extending from the tip of the cylindrical portion with an enlarged diameter in the direction of extension of the tip of the cylindrical portion. At the tip of the section, there is provided a claw section that contacts the end surface of the flange section of the inner ring and extends radially outward from the inner peripheral edge of the cage, and a hanging section that extends from the tip of the cylindrical section with a reduced diameter in the direction in which the tip of the cylindrical section extends. A thrust needle roller bearing characterized by: (2) The thrust needle roller bearing according to claim 1, wherein at least one of the outer ring adherend and the inner ring adherend is prepared in several types of spare parts with different thicknesses of the annular portions.