JP2560683Y2 - Plain bearing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide bearing, and more particularly, to a slide bearing of a type in which a synthetic resin cylindrical bearing for supporting a shaft in a circular hole of a fixing member using a metal plate is injection-molded. .

[0002]

2. Description of the Related Art For example, a conventional plain bearing used for rotatably supporting a fixing roller installed in a fixing device of an electrophotographic copying machine is shown in FIGS.
A circular hole 2 is provided in a fixing bracket 1 formed in a predetermined outer shape using a metal plate, and a cylindrical resin bearing 3 made of synthetic resin for rotatably supporting a shaft of a fixing roller is fixed inside the circular hole 2. As shown in FIG. 6, the cylindrical bearing 3 has an inner diameter slightly smaller than that of the circular hole 2, and the fixing member 1 has a cylindrical shape around the circular hole 2. The bearing 3 is embedded in the outer peripheral portion.

When the cylindrical bearing 3 is injection-molded using a synthetic resin, the cylindrical bearing 3 contracts toward the center as shown by an arrow A in FIG. ,
A compressive force acts in the circumferential direction as shown by arrow B in FIG.

[0004]

However, since the conventional fixing bracket 1 has a structure in which only the circular hole 2 is formed,
There is no function of restraining the shrinkage of the cylindrical bearing 3. Therefore, the diameter of the cylindrical bearing 3 is reduced by shrinkage of the resin after injection molding, and there is no function of preventing the rotation of the fixing bracket 1, thereby causing rattling. There is.

[0005] In addition, since the inner diameter and the outer diameter of the cylindrical bearing 3 are deformed due to the diameter reduction and the function as a bearing is deteriorated, the inner diameter part and the outer diameter part are cut by a lathe after injection molding. There is a problem that must be.

In order to solve the above-mentioned problems, the present invention can surely restrain the shrinkage of an injection-molded cylindrical bearing, and satisfy the function of the bearing as it is by injection molding. It is an object of the present invention to provide a plain bearing that can be used.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a slide in which a synthetic resin cylindrical bearing that penetrates the fixing bracket is injection-molded inside a circular hole provided in the fixing bracket. In the bearing, cutouts are formed at a plurality of locations around the circular hole provided in the fixing bracket, and circular grooves are provided at both ends or on one side of the fixing bracket around the circular hole, both ends of which are in communication with the notch. In this case, a cylindrical bearing formed by injection molding is formed so as to fill the notch and the circular groove.

[0008]

The cylindrical bearing formed by injection molding using a synthetic resin so as to penetrate the fixture is formed so as to fill the notch and the circular groove provided in the fixture, so that the diameter of the resin after the injection molding is obtained. Shrinkage in the direction is constrained by the circular groove, and compression in the circumferential direction is constrained by the notch.Therefore, the cylindrical bearing is free from rattling and deformation due to shrinkage, and satisfies the function as a bearing as it is injection molded Can be done.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in the figure, the sliding bearing 11 has a structure in which a synthetic resin cylindrical bearing 14 penetrating the fixing metal 12 is provided in a circular hole 13 of the fixing metal 12 by injection molding. For example, the fixing roller 14 rotatably supports the shaft of the fixing roller.

The fixing bracket 12 is provided with a circular hole 13 in a metal plate having a desired outer shape, and rectangular cutouts 15 formed at a plurality of positions around the circular hole 13 at equal intervals in the circumferential direction. Further, a circular groove 16 which is concentric with the circular hole 13 and whose both ends communicate with the notch 15 is provided at an outer position along the periphery of the circular hole 13 on both sides of the fixing bracket 12.

The depth of the notch 15 and the position where the circular groove 16 is provided should be within the range of the thickness of the cylindrical bearing 14 which is formed by injection molding using a synthetic resin inside the circular hole 13.
The number 5 may be determined at two or more positions in accordance with the characteristics such as elongation and strength of the synthetic resin used for the cylindrical bearing 14. Further, the circular groove 16 may be provided only on one surface of the fixing bracket 12.

As shown in FIG. 4, a cylindrical bearing 14 formed by injection molding using a synthetic resin so as to penetrate through the fixing fitting 12 inside the circular hole 13 in the fixing fitting 12 has a notch 1 as shown in FIG.
5 and are formed so as to fill the circular grooves 16 on both surfaces.

In the cylindrical bearing 14, the radial shrinkage of the resin after the injection molding is restrained by the circular grooves 16, 16 and the circumferential compression is restrained by the notch 15, respectively. There is no deformation due to shrinkage after injection molding, and no rattling of the fixture 12 occurs.

By the way, the roundness of the inner peripheral portion and the outer peripheral portion of the cylindrical bearing 14 of the sliding bearing 11 of the present invention and the cylindrical bearing 3 of the conventional sliding bearing shown in FIG. 6 after injection molding were measured. Table 1 shows the results.

[0016]

[Table 1]

[0017]

[Effect] As described above, according to the present invention, the shrinkage of the cylindrical bearing injection-molded with synthetic resin in the circular hole of the fixture is reduced.
The blockage is provided by the notch and the circular groove provided in the fixing bracket, so that the cylindrical bearing can be prevented from shrinking after injection molding. Can be satisfied, and the cutting work after injection molding, which was conventionally required, can be omitted.

[Brief description of the drawings]

FIG. 1 is a perspective view of a fixing bracket used for the sliding bearing of the present invention.

FIG. 2 is a plan view of the above.

FIG. 3 is a longitudinal sectional view of the above.

FIG. 4 is an enlarged sectional view of a plain bearing.

FIG. 5 is a perspective view of a fixing bracket used for a conventional plain bearing.

FIG. 6 is a longitudinal sectional view showing a conventional plain bearing.

FIG. 7 is an explanatory view showing a contraction direction of a cylindrical bearing.

[Description of Signs] 11 Slide bearing 12 Fixture 13 Circular hole 14 Cylindrical bearing 15 Notch 16 Circular groove

Claims (1)

(57) [Scope of request for utility model registration] 1. A plain bearing in which a synthetic resin cylindrical bearing that penetrates a fixing bracket is injection-molded inside a circular hole formed in the fixing bracket, wherein notches are formed at a plurality of positions around the circular hole provided in the fixing bracket. A circular groove is provided on both sides or one side of the fixing bracket around the circular hole, the ends of which are in communication with the notch, and a cylindrical bearing formed by injection molding inside the circular hole is formed so as to fill the notch and the circular groove. A plain bearing characterized by being made.