JPH0632809U - Cam follower - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate the disadvantages of using grease as a lubricant for cam followers. [Constitution] In the space around the rolling element 4 of the cam follower,
A so-called plastic grease 17 was filled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a cam follower that rolls on an orbit.

[0002]

[Prior art]

 As shown in FIG. 3, the conventional cam follower is composed of a stud 1, a side plate 2, an outer ring 3, a rolling element 4 and a cage 5. The stud 1 has a head portion 6 at one end, a bearing surface 7 is provided next to the head portion 6, and a small diameter shaft portion 9 is provided at one end of the bearing surface 7 via a step portion 8. A screw portion 11 is provided at the tip of the small diameter shaft portion 9. The side plate 2 having the same diameter as the head portion 6 is forcibly fitted to the stepped portion 8.

The outer ring 3 is rotatably fitted around the bearing surface 7 via rolling elements 4, and steps 12 and 13 are provided at both inner diameter ends of the outer ring 3. The head portion 6 and the side plate 2 are fitted into the respective step portions 12 and 13 via a required labyrinth gap 14. The rolling elements 4 are held by the cage 5 at regular intervals.

A central greasing hole 15 is provided in the shaft center of the stud 1, and a branch greasing hole 16 branched from the greasing hole 15 is provided in the bearing surface 17 and the small-diameter shaft portion 9. A grease nipple and a plug are attached to both ends of the greasing hole 15 described above.

Although the rolling element 4 is held by the retainer 5 in the above, a full-roller type cam follower that does not use a retainer is conventionally known.

[0006]

[Problems to be solved by the device]

 In the cam follower as described above, since grease is used as a lubricant, the outflow of the grease may stain the surrounding area, and maintenance is required to replenish the grease. Furthermore, it is necessary to provide greasing holes 15 and 16 in the stud 1, and a grease nipple and a plug are also required.

Therefore, an object of this invention is to solve the conventional problems caused by using grease as a lubricant.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention rotatably fits an outer ring around a bearing surface provided on a stud with a rolling element interposed between the head part of the stud and a side plate fitted to the stud. In a cam follower that restricts the outer ring in the axial direction and prevents the rolling elements from coming off, a space consisting of the ultrahigh molecular weight polyethylene or the ultrahigh molecular weight polyolefin and a mixture of lubricating grease is formed in the space around the rolling elements. Type lubricating composition (hereinafter referred to as plastic grease).

[0009]

[Action]

 The above-mentioned plastic grease has a lubricating action because oil gradually exudes to the rolling surface of the rolling element, but it does not flow out to the outside because it is a solid substance.

[0010]

【Example】

 The basic structure of the cam follower of the embodiment shown in FIG. 1 is the same as that shown in FIG. 3 described above except that the greasing holes 15 and 16 are not provided. The description will be omitted.

What is different from the conventional case is that the above-mentioned greasing holes 15 and 16 are not provided and a plastic grease 17 is filled instead of the grease.

The plastic grease 17 is 95 to 1 wt% of ultrahigh molecular weight polyethylene having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ and a lubricating grease having a dropping point higher than the gelation temperature of the ultrahigh molecular weight polyethylene. A mixture of 5 to 99 wt% was filled in the space around the rolling element 4, heated above the gelling temperature of the ultrahigh molecular weight polyethylene, and then cooled and solidified (Japanese Patent Publication No. 63-23239). (See the official gazette).

[0013] Other examples of plastic greases, particle size 1 to lubricating grease 5～99Wt% with an average molecular weight of about ^{1 × 10 6 ~5 × 1 0} 6 ultra high molecular weight high dropping point above the gelling point of the polyolefin It is also possible to mix 95 to 1 wt% of the ultra-high molecular weight polyolefin powder of 100 μm and disperse and hold it at a temperature equal to or higher than the gel point.

In any of the above cases, an oil exudation suppressing additive such as a solid wax may be added.

The above-mentioned plastic grease 17 gradually exudes oil and lubricates the rolling surface of the rolling element 4, but since it is a solid substance, it does not flow out to the outside.

FIG. 2 shows a full-roller type cam follower. The basic structure is similar to that described above, but the rolling elements 4 are arranged in two rows, and the cage is omitted. A seal member 18 is attached to the step portions 12 and 13 of the outer ring 3 to close the gap between the head portion 6 and the side plate 2.

The space around the rolling element 4 is also filled with the plastic grease 17.

[0018]

[Effect of device]

 As described above, in the cam follower of the present invention, since the plastic grease, which is a solid lubricant, is used, it does not flow out and therefore replenishment becomes unnecessary, which is a so-called maintenance-free effect. Also, studs can be easily processed, and grease nipples and plugs are not required. Furthermore, plastic grease prevents foreign matter from entering and is not affected by water, making it suitable for outdoor use.

[Submission date] October 26, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention rotatably fits an outer ring around a bearing surface provided on a stud with a rolling element interposed between the head part of the stud and a side plate fitted to the stud. In a cam follower that restricts the outer ring in the axial direction and prevents the rolling elements from coming off, a solid lubricating composition consisting of a mixture of ultra- high molecular weight polyolefin and lubricating grease is provided in the space around the rolling elements (hereinafter , Which is referred to as plastic grease).

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is a sectional view of another embodiment.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 1 stud 2 side plate 3 outer ring 4 rolling element 5 cage 6 head part 7 bearing surface 8 step part 9 small diameter shaft part 11 screw part 12 step part 13 step part 14 labyrinth gap 15 greasing hole 16 greasing hole 17 plastic grease 18 seal Element

[Procedure amendment]

[Submission date] October 26, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

Claims (1)

[Scope of utility model registration request] 1. An outer ring is rotatably fitted around a bearing surface provided on a stud with a rolling element interposed therebetween, and the outer ring is axially restricted by a head portion of the stud and a side plate fitted to the stud. In addition, in the cam follower designed to prevent the rolling elements from coming off, the space around the rolling elements is filled with a solid lubricating composition comprising ultra-high molecular weight polyethylene or a mixture of ultra-high molecular weight polyolefin and lubricating grease. The cam follower.