JP2983603B2 - Slide bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a sliding bearing device that improves durability and sliding characteristics.

[Prior art]

Conventionally, for example, as a plain bearing device for clutch release of an automobile, as shown in FIG. 3, a Teflon-made sheet material 2 and an outer ring 3 are provided on a shaft 1, and an outer peripheral surface of the sheet material 2 is provided. 2a is fixed to the inner peripheral surface 3a of the outer ring 3,
A sheet material in which the inner peripheral surface 2b of the sheet material 2 slides on the outer peripheral surface 1a of the shaft 1 has been proposed (Japanese Utility Model Application Laid-Open No. 54-92245).
Reference). Reference numerals 4 and 4 denote contact-type annular seal bodies, and reference numerals 5 and 5 denote labyrinth seals.

[Problems to be solved by the invention]

However, in the conventional plain bearing device, the shaft 1
The outer peripheral surface 1a of the shaft 1 and the inner peripheral surface 2b of the sheet material 2 slide, so that mud or water can easily enter the sliding part along the outer peripheral surface 1a of the shaft 1, and there is a problem in durability. there were. Also, due to the centrifugal force accompanying the rotation of the shaft 1, the outer peripheral surface of the shaft 1
1a and the inner peripheral surface 2b of the bush 2
In this case, there is a problem in that the lubrication property is deteriorated because the lubrication failure tends to occur due to the shift toward the outer peripheral surface 2a side. Therefore, an object of the present invention is to provide a sliding bearing device that improves durability and sliding characteristics.

[Means for Solving the Problems]

In order to achieve the above object, a plain bearing device of the present invention is provided with a bush made of synthetic resin and an outer ring with respect to a shaft, the bush is fixed to an outer periphery of the shaft, and the bush is formed on an inner periphery of the outer ring. A seal member is provided between both ends of the outer ring and the shaft, and a lubricant is sealed between the inner peripheral surface of the outer ring and the outer peripheral surface of the bush. And Further, it is preferable to form a recess for storing a lubricant in at least one of the outer peripheral surface of the bush and the inner peripheral surface of the outer ring.

[Action]

The inner circumference of the bush is fixed to the outer circumference of the shaft, the outer circumference of the bush is rotatably fitted to the inner circumference of the outer ring, and a lubricant is sealed between the outer circumference of the bush and the inner circumference of the outer ring. As a result, mud, water, etc. transmitted along the outer peripheral surface of the shaft,
Even if it passes through the place where the seal member exists, it does not directly enter between the outer peripheral surface of the bush and the inner peripheral surface of the outer ring. Further, since the lubricant is sealed between the outer peripheral surface of the bush and the inner peripheral surface of the outer ring, even if a centrifugal force caused by the rotation of the shaft acts, the lubricant stays there, so that lubrication failure does not occur. Further, by forming a lubricant reservoir concave portion on at least one of the outer peripheral surface of the bush and the inner peripheral surface of the outer race as described in claim (2), good lubricity can be maintained for a long period of time.

【Example】

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. The slide bearing device shown in FIG. 1 is used for a clutch release device, and a bush 11 made of a synthetic resin is
, A metal outer race 12, and seal members 13, 13. The bush 11 has an inner peripheral surface 11a fixed to the outer peripheral surface 10a of the shaft 10 in a press-fit state, and an outer peripheral surface 11b. The outer ring 12 is provided with a lubricant 1 on the outer peripheral surface 11b of the bush 11.
The inner peripheral surface 12a which is rotatably fitted with the sealing gap t of 4.
And an outer peripheral surface supported by a clutch housing or the like of an automobile
12b and flanges 12c, 12c bent in the axial direction from both ends
And The seal members 13, 13 are fixed to the outer race 12 so as to be located between the inner ends of the flanges 12c, 12c and both ends of the bush 11, and the inner ends of the seal members 13, 13 are Is in sliding contact with the outer periphery of. As a method of manufacturing the above-mentioned plain bearing device, for example, after the outer ring 12 in which silicon grease is applied in advance as a lubricant 14 on the inner peripheral surface 12a, and the seal members 13, 13 are attached to the shaft 10,
In the space S between the inner peripheral surface 12a of the outer race 12 and the outer peripheral surface 10a of the shaft 10, polyacetal as a synthetic resin for the bush 11 is injection-molded. When the synthetic resin is injected and injected, the bush 11 is formed in the space S. With the molding shrinkage of the bush 11, the inner peripheral surface 11a of the bush 11 is fixed to the outer peripheral surface 10a of the shaft 10 in a press-fit state. At the same time, the bushing 11
The contraction gap t between the outer peripheral surface 11b of the outer ring 11 and the inner peripheral surface 12a of the outer ring 12
This causes silicon grease as the lubricant 14 to be sealed in the gap t. Note that the synthetic resin for the bush 11 can be impregnated with the lubricant 14 in advance. In this case, the step of applying the lubricant 14 to the inner peripheral surface 12a of the outer ring 12 may be omitted. Further, after the molding of the bush 11, the lubricant 14 has a shrinkage gap t.
May be injected. As the synthetic resin for the bush 11, besides the above-mentioned polyacetal, a resin that is excellent in abrasion resistance and can be expected to shrink in molding, such as polyamide and polytetrafluoroethylene, can be used as appropriate. It may be thermoplastic or thermosetting. With the above configuration, the inner peripheral surface 11a of the bush 11 is fixed to the shaft 10 by press-fitting, and the bush 11 is sealed between the outer peripheral surface 11b and the inner peripheral surface 12a of the outer ring 12. The outer ring 12 is rotatably fitted to the outer race 12 via a lubricant 14. Therefore, mud, water, and the like transmitted along the outer peripheral surface 10a of the shaft 10 are first prevented from entering the bush 11 side by the seal members 13, 13, and if the mud, water, etc.
The lubricating portion 15 between the outer peripheral surface 11b of the bush 11 and the inner peripheral surface 12a of the outer race 12
Since it is isolated from the lubrication part 15, it does not directly enter the lubrication part 15. Further, the lubricant 14 is applied to the outer peripheral surface 11b of the bush 11 and the outer race 1
Since it is sealed between the inner peripheral surface 12a and the inner peripheral surface 12a, even if a centrifugal force caused by the rotation of the shaft 10 acts, the lubricating portion 15 remains at the lubricating portion 15, so that the lubricity of the lubricating portion 15 is maintained. On the other hand, as shown in FIG.
If the lubricant reservoir recess 11c is formed, the lubricity of the lubricating portion 15 can be maintained for a long time. Note that the lubricant reservoir recess 11c may be formed on the inner peripheral surface 12a of the outer race 12, or may be formed on both the inner peripheral surface 12a of the outer race 12 and the outer peripheral surface 11b of the bush 11.

【The invention's effect】

As is clear from the above description, according to the sliding bearing device of the present invention, mud, water, and the like transmitted along the outer peripheral surface of the shaft are:
Even after passing through the location of the seal member, it does not directly enter between the outer peripheral surface of the bush and the inner peripheral surface of the outer ring, so that rotation failure due to mud or the like does not occur, and durability is improved. In addition, since the lubricant is sealed in the gap between the outer peripheral surface of the bush and the inner peripheral surface of the outer ring, even if the centrifugal force accompanying the rotation of the shaft acts, the lubricant remains in the clearance, so that poor lubrication does not occur. And the sliding characteristics are improved. Furthermore, the shaft, bush, seal member, lubricant, and outer ring can be made into a unit, and the gap between the outer peripheral surface of the bush and the inner peripheral surface of the outer ring is reduced by the molding shrinkage of the synthetic resin for the bush. Since it is only necessary to manage only the clearance, it is easy to manage the clearance and to assemble the bearing device. On the other hand, when a lubricant reservoir concave portion is formed on at least one of the outer peripheral surface of the bush and the inner peripheral surface of the outer ring as in claim (2), poor lubrication does not occur for a long period of time. Is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sliding bearing device according to the present invention, FIG. 2 is a sectional view of a modified example, and FIG. 3 is a sectional side view of a main part of a conventional sliding bearing device. 10 ... shaft, 10 a ... outer peripheral surface, 11 ... bush, 11 a ... inner peripheral surface, 11 b ... outer peripheral surface, 11 c ... lubricant recess, 12 ...
... outer ring, 12a ... inner peripheral surface, 12b ... outer peripheral surface, 14 ... lubricant, 15 ... lubrication part, t ... gap, S ... space.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16C 33/10 F16C 33/20 F16C 33/74

Claims (2)

(57) [Claims] 1. A bush made of synthetic resin and an outer ring are provided for a shaft, and the bush is fixed to an outer periphery of the shaft.
The bush is rotatably fitted to the inner periphery of the outer ring, a seal member is provided between both ends of the outer ring and the shaft, and a lubricant is provided between the inner peripheral surface of the outer ring and the outer peripheral surface of the bush. A sliding bearing device characterized by being enclosed. 2. The sliding bearing device according to claim 1, wherein a recess for storing a lubricant is formed in at least one of an outer peripheral surface of the bush and an inner peripheral surface of the outer ring.