JPH0478318A - Sliding bearing - Google Patents

Abstract

PURPOSE:To prevent grease leakage from a seal part of a sliding bearing by forming communicating passages between inside spaces of the seal of the sliding bearing and a grease reservoir. CONSTITUTION:In a housing 3, four longitudinal straight holes 10-13 for communicating both sides of a filling hole 6 and inside spaces 8,9 of seals 5 and lateral straight holes 14,15 for respectively communicating two longitudinal straight holes 10,12 and 11,13 are formed. The straight holes 12,14,10 form a communicating passage 16 for connecting the space 8 and a grease reservoir 4, and the straight holes 13,15,11 form a communicating passage 17 for connecting the space 9 and the grease reservoir 4. When a sliding bearing 2 is slided on a shaft 1 repeatedly, the grease of the grease reservoir 4 is stored in the inside spaces 8,9 of the seals 5, and the spaces 8,9 are filled with the grease. When the grease is fed to the spaces 8,9 more, the grease is returned to the grease reservoir 4 through the communicating passages 16,17.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a lubrication structure for a sliding bearing.

Conventional technology A sliding bearing that slides (reciprocates) along a shaft has a grease reservoir in contact with the sliding surface, and grease is supplied little by little from there to the gap between the sliding bearing and the shaft, providing lubrication. will be held.

Further, the front and rear ends of the sliding bearing may have seals in contact with the shaft in order to prevent foreign matter such as dust and chips from entering the gap.

When the sliding bearing moves, the grease in the grease pool adheres to the surface of the shaft and is supplied to the gap, or when the sliding bearing returns, the grease on the shaft surface cannot enter the gap. , it will be scraped off at the end of the plain bearing.

Therefore, when a sliding bearing is equipped with seals as described above and slides repeatedly, grease is unilaterally supplied from the grease reservoir to the gap inside the seals arranged at both ends, filling it, gradually increasing the pressure, and finally leaks out from the seal.

This situation is a major problem when used as sliding bearings in mechanical equipment such as injection molding machines that do not like oil stains.

Problems to be Solved by the Invention An object of the present invention is to provide a sliding bearing that is equipped with a seal and is free from grease leakage.

Means for Solving the Problem A communication path is formed between the inner gap of the seal and the grease reservoir in the sliding bearing.

As the internal pressure increases, the grease filling the inner gap of the working seal passes through the communication path, returns to the grease leak, and circulates.

Embodiment FIG. 1 shows a first embodiment, in which a sliding bearing 2 is mounted on a shaft 1, and a housing 3 is fixed to this. The sliding bearing 2 reciprocates linearly in the axial direction of the shaft 1, and a space is provided between the front and rear parts and the space is used as the housing 3.
Grease leakage 4 is formed by blocking the grease.

Seals 5 located at both front and rear ends of the sliding bearing 2 are attached to the housing 3, and their tips are in contact with the shaft 1. Further, the housing 3 is provided with an injection hole 6 in the vertical direction so as to communicate with the grease leakage 4, and a nipple 7 equipped with a check ball valve is attached to the upper end. The housing 3 further includes a gap 8 on both sides of the injection hole 6 and an inner gap 8 of the seal 5.
Four vertical straight holes 10 to 13 leading to 9 and two vertical straight holes 10
and 12, and a horizontal straight hole 1 that communicates 11 and 13, respectively.
4.15 is formed and the communication path connecting the gap 8 and the grease leakage 4 through the straight holes 12 and 14.1O]6 or the straight hole 1
3. 1.5. 1.1 A communication path 17 connecting the gap 9 and the grease leakage 4 is configured.

Check valves 18[deg.]9 are installed on the grease leakage 4 sides of the straight holes 10 and 11 to prevent the grease from returning from the grease leakage 4 side.

When the sliding bearing 2 repeatedly slides on the shaft 1, the grease from the grease leakage 4 accumulates in the inner gap 8.9 of the seal 5 and fills it. Then, when more grease is fed into the gap 8°9, the grease flows through the communication path], 6.
17 and return to grease leak 4.

Note that when grease is injected from the injection hole 6, the internal pressure of the grease leakage 4 increases and tries to flow back into the communication path 26.17, but this is blocked by the check valve 1.8.19.

In this way, the internal pressure in the inner gaps 8, 9 of the seal 5 is removed and no grease leaks out from the seal 5.

Also, the grease circulates slowly while providing lubrication.

FIG. 2 shows a second embodiment, in which the horizontal straight holes 14, 15 communicating with the vertical straight holes (10, 12), (11, 13) in the first embodiment are replaced by the housing 3 in this embodiment. is connected by a tube 20 on the outside, and the seal 5 is in the form of an O-ring.

Not only is it easy to form the communication path 16.17, but also the used grease in the gaps 8 and 9 pushed out from the tube 20 can be collected by removing the straight hole 10.11 side of the tube 20, if necessary. .

FIG. 3 shows a third embodiment, in which the communication passages 16 and 17 are composed of grooves provided on the outer surface of the sliding bearing 2 and short straight holes that reach the grease leakage 4 from the ends of the grooves, and are sealed. 5 in a packaged form. Communication path 16.1
7 is completed by attaching the housing 3.

The other configurations are the same as the first embodiment.

The communication path 1.6.17 is easier to form, and
Since there is no need to process the housing 3 side, it can be used in cases where it is difficult to process the housing 3.

FIG. 4 shows a fourth embodiment, in which a horizontal straight hole is provided in the sliding bearing 2 to directly connect the grease leak 4 and the gap 8.9 inside the seal 5 to form a communication path 1.6.17. .

The other configurations are the same as in the first embodiment.

The communication paths 16 and 17 are the shortest and are not bent, so they are easy to process.

Effect of the invention Grease does not leak from the seal part of the sliding bearing.

Since grease is always present in the gap inside the seal, the lip of the seal is always well lubricated and there is little wear and tear on the lip.

Grease consumption is reduced.

It is also possible to collect the grease after use.

[Brief explanation of the drawing]

1 is a sectional view, FIG. 2 is a sectional view of the second embodiment, FIG. 3 is a sectional view of the third embodiment, and FIG. 4 is a sectional view of the fourth embodiment. 1... Shaft, 2... Sliding bearing, 3... Nozzing, 4... Grease reservoir, 5... Seal, 8, 9...
...Gap, 1.6.17...Communication path. Procedural amendment (method) % formula % Display of the case 1990 Patent Application No. 189518 2゜ Name of the invention Relationship with the case of the person making the sliding bearing amendment Patent applicant address Kobaba, Oshinogusa, Oshino Village, Nanbu Ru District, Yamanashi Prefecture 3580 Address Name Fanuc Co., Ltd. 4゜ Agent (〒105. Telephone 502-2578) 1990 1
October 15th (shipped October 30th, 1990)

Claims (1)

[Claims] A sliding bearing comprising a grease reservoir and a seal, characterized in that a communication path is formed between the inner gap of the seals at both ends and the grease reservoir.