JPH0534334Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement of a follower bearing in which rolling elements are incorporated between a shaft and a thick outer ring, and is used for rotating the outer ring.

Conventional technology In conventional follower bearings, the axial load generated on the outer ring due to skew, etc. is caused by sliding contact between both side walls of the outer ring and the flanges and side plates of the shaft located outside of the both side walls. It was overloaded. Therefore, when a large axial load occurs, such as when there is a large installation error or when the load conditions are severe, the friction of the sliding contact causes seizure in the contact area, which causes the problem that it becomes unusable in a short period of time. It was hot.

In order to solve the above problem, a thin annular thrust washer having a plurality of through holes is provided between both side wall surfaces of the outer ring and the flange portion and side plate of the shaft, which are arranged outside the both side wall surfaces. A follower bearing has been devised in which seizure resistance is improved by rotatably sandwiching the outer ring as an intermediate member to reduce the relative sliding speed between both side wall surfaces of the outer ring and the flange portion and side plate of the shaft. Follower bearings continue to suffer from premature seizure in environments with poor lubrication conditions.

Problems to be Solved by the Invention In view of the above-mentioned problems of the prior art, the present invention aims to provide a follower bearing at a low cost that further improves seizure resistance and prevents premature seizure even in environments with poor lubrication conditions. is the issue.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention includes a flange portion formed at one end of the shaft, and a flange portion formed between the raceway surface, which is the inner peripheral surface of the thick outer ring, and the raceway surface of the shaft. In a follower bearing in which a rolling element group is incorporated and an annular thrust washer is rotatably inserted between both side wall surfaces of the outer ring and a flange portion and side plate of the shaft, the rolling element group has a circular ring on both sides in the axial direction. They are guided and held at equal intervals by an annular retainer, and do not come into contact with the thrust washer. On both sides of the thrust washer, bottomed recesses that can hold lubricant and do not penetrate are formed. At the same time, a thin film layer is formed on the surface of the thrust washer made of a material that has good compatibility with the respective sliding surfaces of the outer ring, flange portion, side plate, and cage. A group of rolling elements with a cage is sealed within the bearing by a thrust washer.

Effect Since the present invention has the above-mentioned configuration, the recesses on both sides of the thrust washer retain lubricant.
The lubricant provides lubrication and cooling to the contact areas between both side walls of the outer ring and the thrust washer, as well as the contact areas between the shaft flange, side plate, and retainer, and the coating layer formed on the thrust washer. Since the coefficient of friction at the contact portion is small, the group of rolling elements with a cage is sealed within the bearing by the outer ring, flange, side plate, and both thrust washers, making it difficult to replace the lubricant and preventing environments with poor lubrication conditions. Even in this case, early seizure does not occur at the contact portion. In addition, it is inexpensive because it does not require complicated processing.

Embodiment FIG. 1 shows a cam follower 10 with a thrust washer, which is an example of the implementation of a follower bearing with a thrust washer according to the present invention.

In this figure, a thick-walled cylindrical outer ring 1 is thick because it is used as a rotating body, and a raceway surface 1a for rolling rollers 2, which are rolling elements, is formed on the inner peripheral surface. On both side wall surfaces 1c in the axial direction,
A stepped portion 1b, which is a concave portion, surrounds the opening edge of the raceway surface 1a.

The stepped portion 1b is formed into an annular shape whose center coincides with the center of the raceway surface 1a and has an inner diameter larger than the inner diameter of the raceway surface 1a.

The shaft 3 inserted into the hollow part of the outer ring 1 has a raceway surface 3a formed at one end in the axial direction for rolling the rollers 2 together with the raceway surface 1a of the outer ring 1, and an end portion having the raceway surface 3a. A substantially disk-shaped flange portion 3c is formed on the end surface of the flange portion 3c.

Further, the shaft 3 has a cylindrical portion 3d formed at the center in the axial direction, and the diameter of the cylindrical portion 3d is set to be slightly smaller than the diameter of the raceway surface 3a, so that the cylindrical portion 3d and the raceway surface 3a form a step 3e. A threaded portion 3b is formed at the end opposite to the end in the axial direction where the raceway surface 3a is formed, and the threaded portion 3d
Accordingly, the thrust washer-equipped cam follower 10 of the embodiment is attached to a bearing attachment member.

The shaft 3 is inserted into the hollow part of the outer ring 1 with its raceway surface 3a facing the raceway surface 1a of the outer ring 1, and is inserted into the stepped part 1b on the left side of the outer ring 1 in FIG.
A flange portion 3c is rotatably inserted into the
An annular thrust washer 5 penetrated by the shaft 3 is rotatably inserted between the inner surface of the flange portion 3c and the bottom surface 1d of the stepped portion 1b facing the inner surface. A plurality of rollers 2, which are rolling elements, are installed between the surface 3a and the raceway surface 1a of the outer ring 1, and are held at equal intervals by a cage 4.

Further, a substantially annular side plate 6 is press-fitted and fixed to the cylindrical portion 3d of the shaft 3, and the inner surface of the side plate 6 is brought into contact with the step 3e of the shaft 3, and the side plate 6 is It is rotatably inserted into the stepped portion 1b on the right side of the outer ring 1, and between the inner surface of the side plate 6 and the bottom surface 1d of the stepped portion 1b facing the inner surface is a circle penetrated by the shaft 3. An annular thrust washer 5 is rotatably inserted, and the side plate 6 and the flange portion 3c of the shaft 3 position the outer ring 1 on the shaft 3 in the axial direction.

The side plate 6 and the flange portion 3c are each
The diameter size is set so that it is inserted into the stepped portion 1b of the outer ring 1 and exhibits a dustproof effect.

The thrust washer 5 is made of iron or steel, and as shown in FIGS. 2 and 3, a plurality of approximately hemispherical recesses 5a are formed on both surfaces thereof, arranged at equal intervals vertically and horizontally. Each of the recesses 5a holds a lubricant, and the lubricant coats the contact portions of the both side wall surfaces 1c of the outer ring 1 with the bottom portions 1d of the stepped portions 1b, the flanges 3c, and the inner surfaces of the side plates 6. The lubricating and cooling effects are applied to the contact portions with the cage 4 and the cage 4, respectively.

The thickness of the thrust washer 5 and the number of recesses 5a are set so that the recesses 5a do not become extremely shallow due to the axial load applied to the thrust washer 5.

Furthermore, as shown in FIG. 4, which is an enlarged view of section B in FIG. 3, the thrust washer 5 has a thin film layer 5b formed on the surface thereof, which is made of a material such as copper or silver that has good compatibility with metals. and the coating layer 5
b further reduces the coefficient of friction with the contact portion.

As described above, in the thrust washer-equipped cam follower 10 of the embodiment, the lubricant held in the recess 5a of the thrust washer 5 provides lubrication and cooling to the contact portion, and the thrust washer 5
Since the coating layer 5b reduces the friction coefficient of the contact portion, the group of rolling elements with a cage is sealed within the bearing by the outer ring, flange portion, side plate, and both thrust washers, making it difficult to replace the lubricant and preventing lubrication. Premature seizure does not occur at the contact portion even under adverse conditions. Further, it has a dustproof effect on the part holding the thrust washer 5, and is inexpensive because it does not require complicated processing.

By the way, the thrust washer 5 shown in FIG. 5 is a thinner version of the thrust washer 5 shown in FIG. 3, and the thrust washer 5 shown in FIG. suitable for use.

In addition, the thrust washer 5 shown in FIG.
is another example of a thrust washer in which annular recesses 5a are concentrically formed on both surfaces, and the recesses 5a retain lubricant and prevent the lubricant from flowing out. Ru.

Note that the shape, material, etc. of the thrust washer 5 and the shape, number, etc. of the recessed portions 5a of the thrust washer 5 are not limited to the embodiments described above.

In the embodiment described above, both side wall surfaces of the outer ring 1 are formed by the side wall surface 1c and the bottom surface 1d of the stepped portion 1b, but the side wall surface 1c is formed by the fitting of the shaft 3 without forming the stepped portion 1b. It may be formed in a series up to the insertion hole.

Further, in the above-mentioned embodiment, the cam follower 10 with a thrust washer is shown in which the shaft 3 is tightly fitted into the outer ring 1 via the rollers 2, but the present invention is not limited to this cam follower 10, and the cam follower 10 has a cylindrical shape. It is also applicable to a roller follower, etc., in which the inner ring is tightly fitted to the outer ring 1 via the rollers 2.

Effects Since the present invention has the structure and operation described above, the group of rolling elements with a cage is sealed in the bearing by the outer ring, flange, side plate, and both thrust washers, making it difficult to replace the lubricant. Even in environments with poor lubrication conditions, there is no premature seizure of the sliding contact area caused by skew, etc., and it is inexpensive as it does not require complicated machining, and has much better lubrication than conventional products. It has excellent properties such as durability, low friction and wear resistance.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of an example of implementation, and Fig. 2 is a longitudinal cross-sectional view of an example of implementation.
A plan view of the thrust washer shown in the figure,
FIG. 3 is a sectional view taken along the line A-A of the structure shown in FIG. 2, FIG. 4 is an enlarged view of part B of the structure shown in FIG. 3, and FIG.
FIG. 6 is a sectional view similar to that shown in the figure, and a partially omitted perspective view showing another example of the thrust washer. 1...Outer ring, 1c...Side wall surface, 1d...Bottom surface,
3... Shaft, 3c... Flange portion, 5... Thrust washer, 5a... Concave portion, 5b... Coating layer, 6...
...side plate.

Claims (1)

[Scope of utility model registration request] A flange portion is formed at one end of the shaft, and a group of rolling elements is incorporated between the raceway surface, which is the inner circumferential surface of a thick outer ring, and the raceway surface of the shaft, and the rolling elements are assembled between both side wall surfaces of the outer ring, the flange portion of the shaft, and the side plate. In a follower bearing in which an annular thrust washer is rotatably inserted between the rolling elements, the rolling element group is guided and held at equal intervals on both sides in the axial direction by an annular retainer, and is brought into contact with the thrust washer. On both sides of the thrust washer, there are formed recesses with bottoms that do not penetrate and can hold lubricant, and on the surface of the thrust washer,
A thin film layer is formed of a material that has good compatibility with the sliding surfaces of the outer ring, flange, side plate, and cage, and the outer ring, flange, side plate, and both thrust washers form a group of rolling elements with a cage. A follower bearing with a thrust washer that is sealed within the bearing.