JPS6139875Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to improvements in cam followers and roller followers.

Conventionally, cam followers or roller followers, which are often used in machine tools and office machines, generally use roller bearings with a rotating outer ring.Due to their structure, they mainly support radial loads, and thrust loads are carried by the stepped end surface of the outer ring. and the end face of the collar on the inner ring side or the end face of the collar ring attached to the inner ring side.

Figure 1 shows a typical conventional cam follower. In the figure, 1 is an outer ring, 2 is a roller, 3 is a shaft member that also serves as an inner ring, 4 is a collar ring, 5 is a machine frame, and 6 is a cam plate. It is.

The outer ring 1 has a stepped inner circumferential surface 11 on the inner circumferential side of both ends, and an inner circumferential raceway surface 12 having a smaller diameter than the stepped inner circumferential surface 11, and an inner circumferential raceway surface 12 and the stepped inner circumferential surface 1.
1, and has a step end face 13 between the outer peripheral face 14 and
is in contact with the cam plate 6.

A plurality of rollers 2 are inscribed in the inner circumferential raceway surface 12 of the outer ring, and the shaft member 3 having an outer circumferential raceway surface 34 inscribed in the rollers 2 has one end thereof inscribed with the inner circumferential raceway surface 12 of the outer ring. The collar part 32 has a collar outer circumferential surface 39 having a larger diameter, and has a stepped outer circumferential surface 35 having a smaller diameter than the outer circumferential raceway surface 34 on the other side, and the shoulder outer circumferential surface 35 has a shoulder outer circumferential surface 35 . A collar ring 4 having a collar outer peripheral surface 42 having approximately the same diameter as the outer peripheral surface 39.
are fitted together, and the stepped portion 38 of the stepped outer circumferential surface 35 is fitted.
The collar ring 4 is positioned in the axial direction, and a threaded portion 37 is provided on the end side of the outer peripheral surface 35 of the stepped portion, and a nut 71 screwed into the threaded portion 37 allows the shaft member 3 and the collar ring 4 to be positioned. It is attached and fixed to the machine frame 5.

Next, a conventional roller follower similar in structure to the cam follower is shown in FIG. 2, but the outer ring 1 and roller 2 have the same structure as the cam follower shown in FIG. 31 is used, and the inner ring 31 has an outer circumferential raceway surface 34 on the outer periphery and a stepped outer circumferential surface 35 with collar rings 4 at both ends, and a hole 3 on the inner circumferential side.
It is attached and fixed to the machine frame 5 by a bolt 7 and a nut 71 that fit into the frame 6 .

In the conventional cam follower and roller follower configured as described above, the outer ring 1 rotates in contact with the cam plate 6 while transmitting a radial load to the shaft member 3 or the inner ring 31 via the roller 2. Due to manufacturing errors, the contact position between the cam plate 6 and the outer peripheral surface 14 of the outer ring may be biased to one side, or
In addition, thrust loads are generated due to elastic deformation of the shaft member 3 and inner ring 31 due to radial loads.
This thrust load is supported by sliding contact between the step end surface 13 of the outer ring and the collar end surface 33 of the collar portion 32 or the collar end surface 41 of the collar ring 4, so that during use, Seizing often occurs in this part, and the life of the cam follower or roller follower is much shorter than the original rolling bearing life due to these accidents.

Furthermore, since cam followers and roller followers are generally installed and used with external exposure, dirt, water, etc. from the outside may enter the internal sliding contact area or rolling contact area and become another factor that causes seizure. The outer ring outer circumferential surface 39 or the outer ring outer circumferential surface 42 is provided on the inner circumferential surface 11 of the outer ring.
A contact type or non-contact type seal body is attached to the cylinder to prevent foreign matter from entering from the outside (for example, see British Patent No. 1179218 and US Patent No. 3266856). However, it was not sufficient to prevent seizure accidents caused by the thrust load and to improve sealing performance.

Furthermore, in the above-mentioned British Patent No. 1179218 and U.S. Patent No. 3266856, in order to prevent seizure accidents due to wear and heat generation caused by the above-mentioned thrust load, discloses a technology in which an annular ring washer is installed, but this ring washer is
Since it is fixedly held against the outer ring, the effect is limited to preventing the collar or ring from coming into direct contact with the outer ring, and the ring washer is prevented from sliding relative to the collar or ring. The effect of reducing speed cannot be obtained,
Therefore, it is not always possible to obtain a sufficient effect in preventing wear and heat generation between the mutual contact surfaces, and there are also disadvantages such as uneven wear occurring between the mutual contact surfaces.

The purpose of this invention is to provide a cam follower and a roller follower that eliminate these conventional drawbacks, and a thrust washer made of a self-lubricating material guided by a sealing device is built into the sliding contact portion to provide a thrust This prevents seizure accidents caused by loads and improves sealing performance.

Next, a description will be given with reference to the first embodiment shown in FIG. 3, which shows the main parts of the cam follower according to this invention.
is an outer ring, 2 is a roller, 3 is a shaft member that also serves as an inner ring,
4 is a collar ring, 8 is a seal body, and 9 is a thrust washer. (In this embodiment, the same reference numerals are used for parts common to the conventional one.) The outer ring 1 has a stepped inner circumferential surface 11 provided with seal bodies 8 on the inner circumferential side of both ends, and a stepped inner circumferential surface 11 having a smaller diameter than the stepped inner circumferential surface 11. It has an inner circumferential raceway surface 12 and a stepped end surface 13 between the inner circumferential raceway surface 12 and the step inner circumferential surface 11. A plurality of rollers 2 are inscribed in the inner circumferential raceway surface 12 of the outer ring, and the shaft member 3 having an outer circumferential raceway surface 34 inscribed in the rollers 2 has one end thereof inscribed with the inner circumferential raceway surface 12 of the outer ring. It has a collar portion 32 having a collar outer circumferential surface 39 having a larger diameter, and has a stepped outer circumferential surface 35 having a smaller diameter than the outer circumferential raceway surface 34 on the other side, and has a shoulder outer circumferential surface 35 on the stepped outer circumferential surface 35. Outer surface 39
A collar ring 4 having a collar outer circumferential surface 42 having approximately the same diameter as the outer circumferential surface 42 of the shoulder ring is fitted into the collar ring 4, and further the stepped portion 3 of the stepped outer circumferential surface 35
8, the collar ring 4 is positioned and fixed in the axial direction.

The seal body 8 includes a cylindrical portion fitted into the stepped inner circumferential surface 11 of the outer ring, a mandrel 81 having a side wall 87 whose one surface is in contact with the stepped end surface 13, the brim outer circumferential surface 39, and the collar ring. A rubber seal 8 is provided with a seal lip 83 in sliding contact with the outer peripheral surface 42 and a guide surface 85 having a diameter larger than the inner diameter of the seal lip 83 on the inner peripheral part on the opposite side in the axial direction from the seal lip 83.
2 are integrally connected. In addition, the core metal 81
The inner diameter portion of the side wall 87 (the portion on the inner diameter side of the guide surface 85) is not provided with an elastic body connected to the seal lip 83, and the inner diameter portion of the side wall not provided with the elastic body and the collar portion are not provided with an elastic body connected to the seal lip 83. A thrust washer 9 is built in between the end surface 33 and the collar end surface 41, and is guided by the guide surface (inner circumferential surface) 85 of the rubber seal 82 and freely rotates with an appropriate gap in the axial direction. There is.

The thrust washer 9 is made of a self-lubricating material;
For example, it is made of materials such as nylon 66 with added elements such as glass fiber and molybdenum disulfide.
Its outer peripheral surface has an outer diameter slightly larger than the inner diameter of the seal lip 83, and the seal lip 83 is elastically deformed so that it can be inserted and held inside the seal body 8. Further, the inner diameter of the thrust washer 9 is equal to the outer circumferential raceway surface 34 of the shaft member.
It is formed to have a slightly larger diameter so that it can come into contact with the end of the roller 2.

FIG. 4 shows a cam follower showing a second embodiment of this invention, in which a seal body 8 similar to that of the first embodiment is press-fitted into the stepped inner circumferential surface 11 of the outer ring 1. The inner circumferential surface of the thrust washer 9 whose outer circumferential surface is guided by the guide surface 85 of the thrust washer 9 has a diameter slightly larger than the inner circumferential raceway surface 12 of the outer ring 1 so as not to contact the end of the roller 2. The thrust washer 9 is formed by providing an appropriate gap between the side wall 87 of the mandrel of the seal body 8 and the flange end surface 33 and flange ring end surface 41 of the shaft member 3.
is built-in.

The relationship between the outer ring 1 and the roller 2, the shaft member 3 and the collar ring 4, etc. is the same as the first one except for the relationship between the thrust washer 9 and the end of the roller 2.
The structure is similar to that of the embodiment.

As mentioned above, in the cam follower and roller follower of this invention, the stepped inner peripheral surface of the outer ring 1
1 has a seal lip 83 in sliding contact with the outer circumferential surface 39 of the collar portion and/or the outer circumferential surface 42 of the collar ring of the shaft member 3, and has an inner diameter surface on the inside of the seal lip 83 with a diameter larger than the inner diameter of the seal lip 83. a rubber seal 82 having a shaped guide surface, and a side wall 87 whose one surface is in contact with the stepped end surface 13 of the outer ring.
A sealing body 8 consisting of a mandrel 81 having a shape of
In addition, a thrust washer 9 made of a self-lubricating material, such as glass fiber or nylon 66 doped with molybdenum disulfide, is installed.
Of the side wall 87 of the square-shaped mandrel guided by a guide surface 85 formed on the inner periphery of the seal body 8,
Inner diameter part without elastic body and collar end face 3 of shaft member
3 and/or the end face 41 of the collar ring, so that even if a load in the thrust direction is applied between the outer ring 1 and the shaft member 3 or between the outer ring 1 and the inner ring 31, the above-mentioned The self-lubricating action of the thrust washer 9 reduces friction caused by sliding contact between the smooth side wall 87 of the mandrel in contact with the step end surface 13 of the outer ring and the collar end surface 33 and/or the collar ring end surface 41. , it is possible to prevent burn-in. In addition, the seal body 8 prevents dirt, water, etc. from entering from the outside and extends the life of the cam follower or roller follower.
Since it is not fixed to the circumferential stage of the outer ring 1 and can freely rotate using the cylindrical guide surface of the seal body 8 as a guide surface, it rotates smoothly with the rotation of the outer ring 1, and as a result, the mutual Since the relative sliding speed between the contact surfaces is reduced, the above-mentioned wear and heat generation can be further suppressed, and local wear is also reduced, making it possible to significantly improve rotational performance.

Furthermore, since the thrust washer 9 has an outer diameter larger than the inner diameter of the seal lip 83 of the seal body, in its assembled state, even though it is not fixed to the outer ring, it is assembled in a non-separable state. As a result, handling of the parts can be facilitated.

Further, in the cam follower and roller follower of the first embodiment in which the thrust washer 9 and the end of the roller 2 can come into contact with each other, it is possible to reduce the frictional force caused by the contact between the end of the roller.

The above embodiment has been explained using a cam follower, but as mentioned above, the difference between a cam follower and a roller follower is that the inner ring 31 and the collar ring 4 are used instead of the shaft member 3 and the collar 32 of the cam follower, respectively. This part is applied to a roller follower by replacing the members in this part. Further, the thrust washer 9 and the seal body 8
The shape and material of are not limited to the examples,
It is intended to be implemented with appropriate changes within the scope of the utility model registration request.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing a conventional cam follower.
FIG. 2 is a vertical cross-sectional view showing a conventional roller follower;
3 and 4 are longitudinal sectional views of the main part of a cam follower showing an embodiment of the present invention, with Fig. 3 showing the first embodiment and Fig. 4 showing the second embodiment. In the drawings, the reference numerals 1, 2, 3, 31, 4, 8, 8, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53,
9 is a thrust washer.

Claims (1)

[Claims for Utility Model Registration] (1) An outer ring having a stepped inner circumferential surface and an inner circumferential raceway surface smaller in diameter than the stepped inner circumferential surface on the inner circumferential side of both ends, and a diameter larger than the inner circumferential raceway surface of the outer ring. In the cam follower or roller follower, the cam follower or roller follower is provided with a flange portion and/or a flange ring having an outer circumferential surface, and has a roller between an inner circumferential raceway surface of the outer ring and a shaft member or inner ring having an opposing outer circumferential raceway surface, A seal lip is provided on the inner circumferential surface of the stepped portion of the outer ring in contact with the outer circumferential surface of the inner ring side rib and/or the outer circumferential surface of the collar ring, and a cylindrical guide surface with a diameter larger than the inner diameter of the seal lip is provided inside the seal lip. A seal body consisting of a rubber seal and a mandrel integrally connected with the rubber seal and having a side wall whose one side is in contact with the end surface of the step formed between the inner circumferential surface of the stepped portion of the outer ring and the inner circumferential raceway surface. The seal body is provided between the inner diameter portion of the side wall of the mandrel having the shape described above, which does not have an elastic body, and the end face of the inner ring collar and/or the end face of the collar at a position facing the inner diameter portion of the mandrel. A cam follower or a roller follower, characterized in that it has a built-in thrust washer made of a self-lubricating material, which freely rotates using the guide surface of the rubber seal as a guide surface, and has an outer peripheral surface larger than the inner diameter of the seal lip of the rubber seal. (2) In claim 1 of the utility model registration claim, the inner peripheral surface of the thrust washer has an inner diameter slightly larger than the outer peripheral raceway surface on the inner ring side, so that the end surface of the thrust washer can come into contact with the end of the roller. A cam follower or a roller follower configured to.