JP3047560U - bearing - Google Patents

Abstract

(57) [Problem] To provide a bearing having elasticity, abrasion resistance and slidability with a low coefficient of friction. SOLUTION: A bearing core material is formed of an elastic member, and an ultrahigh molecular weight polyethylene layer is laminated and integrated on both front and back surfaces of the bearing core material.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a bearing (sliding member) such as a thrust bearing also having a packing property and a journal bearing capable of slightly oscillating.

[0002]

[Prior art]

 Conventionally, metal has been used for bearings such as thrust bearings and journal bearings, and there are also bearings molded with thermoplastic synthetic resins. Compared with metal bearings, the latter synthetic resin bearings have strength, hardness, and heat resistance in that the synthetic resin bearings are significantly inferior. Therefore, the weak points of machining accuracy, dimensional stability (due to temperature change), and withstand voltage must be taken into account.

In addition, not only the bearing is fixedly held at a fixed position, but also in some cases, it is desired to move the shaft in response to movement of the shaft, for example, runout of the shaft. It is better to have less. Further, the packing action may be required of the bearing, but none of the conventional metal bearings and resin bearings satisfy these requirements.

[0004]

[Problems to be solved by the invention]

 The present invention has been made in view of the above-mentioned problems of the conventional technology, and has as its object to provide a bearing having excellent elasticity and slidability.

[0005]

[Means for Solving the Problems]

 The technical measures taken by the present invention to solve the above-mentioned problems include a three-layer structure in which the bearing core is composed of an elastic member and ultra-high molecular weight polyethylene layers are laminated and integrated on both front and back surfaces of the bearing core. Features. The above bearings include a thrust bearing and a journal bearing (radial bearing). In the case of a thrust bearing, the bearing core is formed in a donut plate shape, and in the case of a journal bearing, the bearing core is formed in a short cylindrical shape.

The elastic member constituting the bearing core material includes a rubber material, and examples of the rubber material include styrene butadiene rubber (SBR), natural rubber, ethylene propylene rubber (EPDM), butyl rubber, and silicone rubber. No. The elasticity imparted to the bearing core material is adjusted to the elasticity suitable for the application and purpose by adjusting the type of rubber material, thickness of rubber material, rubber hardness and the like. The ultrahigh molecular weight polyethylene layers laminated on both surfaces of the bearing core material have a molecular weight of 1,000,000 or more, and may be ultrahigh molecular weight polyethylene, or an ultrahigh molecular weight polyethylene composition or a polymer alloy type.

Further, when the form of the bearing is a thrust bearing, the shape of the outer peripheral end face of the bearing is not limited to a general vertical plane, and the shape of the end face may be changed according to the purpose. The shape of the end face is such that it protrudes in an arc shape toward the outside in the radial direction, or is concave in the shape of an arc toward the inside in the radial direction, and furthermore, it is inclined inward from the upper edge to the lower edge. Examples include a tapered surface. Also, the lamination and integration of the bearing core material and the ultra-high molecular weight polyethylene layer are performed when both are heat-molded by the action of a vulcanizing agent for the rubber constituting the bearing core material and a peroxide added to the rubber. They may be bonded together or may be bonded via an adhesive.

According to the above means, the bearing core is formed of an elastic member such as a rubber material, and has a three-layer structure in which ultra-high molecular weight polyethylene layers are laminated and integrated on both front and back surfaces. Packing properties and mobility are exhibited by the elastic deformation of the elastic member. In addition, since an ultra-high molecular weight polyethylene layer having abrasion resistance and a low friction coefficient is disposed on both front and back surfaces of the bearing core material, the bearing core material has excellent slidability as well as elastic deformation. As a result, a thrust bearing also having a packing property and a journal bearing capable of slightly oscillating the center become possible.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a thrust sliding type bearing. In the figure, reference numeral 1 denotes a bearing core made of an elastic member, and ultra-high molecular weight polyethylene layers 2 and 2 ′ are bonded and laminated on both front and back surfaces of the bearing core 1. The bearing has a three-layer structure.

The type of the elastic member (rubber material) constituting the bearing core material 1 may be selected from styrene-butadiene rubber (SBR), natural rubber, ethylene propylene rubber (EPDM), butyl rubber, and silicone according to the intended use of the bearing. It is selected from rubber and the like, and the thickness and hardness of the flat plate of the elastic member are also adjusted according to the use. Then, the flat plate whose thickness and hardness are adjusted is formed in a donut shape, and ultra-high molecular weight polyethylene layers 2, 2 'are bonded and laminated on both front and back surfaces. The ultrahigh molecular weight polyethylene layers 2, 2 'have a molecular weight of 1,000,000 or more, and are formed of, for example, ultrahigh molecular weight polyethylene having a molecular weight of 5.5 million or more (trade name: Saxin Newlite) manufactured by the present applicant. .

The shape of the outer peripheral end face of the bearing core 1 may be changed according to the purpose as shown in FIG. 2 in addition to the general vertical plane shown in FIG. FIG. 2A shows that the outer peripheral end face is formed so as to protrude in an arc shape toward the outside in the radial direction, which is effective for enhancing the packing property. In FIG. 2B, the outer peripheral end face is concaved in an arc shape inward in the radial direction so that the resistance can be reduced when the bearing itself moves. In FIG. 2C, the resistance can be further reduced than in the case of FIG.

FIG. 3 shows a journal sliding type bearing, in which a bearing core 3 is formed in a short cylindrical shape by an elastic member, and ultra-high molecular weight polyethylene layers 4, 4 ′ are integrally laminated on the inner and outer surfaces of the bearing core 3. It is configured to be. In the embodiment shown in FIGS. 1 and 3, the lamination and integration of the bearing cores 1, 3 of the elastic member and the ultra-high molecular weight polyethylene layers 2, 2 ', 4, 4' are performed by adding the rubber of the elastic member. Due to the action of the oxidizing agent added to the sulfuric acid and rubber, they adhere when both are molded by heating.

[0013] The bearing configured as described above has a packing property due to the elasticity of the bearing core material and the abrasion resistance and low friction coefficient of the ultra-high molecular weight polyethylene layer integrated on both the front and back surfaces of the bearing core material. This is the optimal bearing as a thrust bearing that also serves as a journal bearing that can slightly run out of center.

[0014]

[Effect of the invention]

 The bearing according to the present invention can provide a bearing having elasticity and slidability by the configurations described in claims 1 and 2. Therefore, it is possible to provide an optimal bearing as a bearing requiring slidability, such as a thrust bearing also having a packing property and a journal bearing capable of slightly oscillating the center.

[Brief description of the drawings]

1A and 1B show a thrust sliding type bearing, in which FIG. 1A is a front view, and FIG. 1B is a cross-sectional view along line (X)-(X).

2A and 2B show a modified example of the shape of the outer peripheral end portion of the bearing shown in FIG. 1, wherein FIG. 2A shows an example in which the bearing protrudes radially outward in an arc shape, and FIG. Example of concave in an arc shape,
(C) is an example in which it is formed on a tapered surface.

FIG. 3 shows a journal sliding type bearing, in which (a) is a partially cutaway front view, and (b) is (Y)-(Y).
It is sectional drawing which follows a line.

[Explanation of symbols]

 1,3: bearing core material 2,2 ', 4,4': ultra-high molecular weight polyethylene layer

Claims (2)

[Utility model registration claims] 1. A bearing of a thrust sliding type or a journal sliding type, wherein a bearing core material is formed of an elastic member, and ultra-high molecular weight polyethylene layers are laminated and integrated on both front and back surfaces of the elastic member. 2. The bearing according to claim 1, wherein the bearing core material of the elastic member and the ultrahigh molecular weight polyethylene layer are bonded and integrated by heat molding.