JPS6240772Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has a part that has a larger diameter than the fitting diameter of an elastic ring such as an oil seal or packing, and is formed on the shaft end side of the fitting part for the elastic ring. Regarding the shaft insertion jig for an elastic ring used for fitting the shaft with the elastic ring by passing the large diameter end, more specifically, it is used to prevent damage to the inner peripheral part of the elastic ring due to the large diameter end of the shaft. The present invention presents a structure of a shaft insertion jig for an elastic ring that can prevent this problem.

For example, in a propeller shaft 1 used in the drive section of an automobile shown in FIG. In a mechanical device having a small diameter compared to the diameter dimension of There is a high possibility that the sealing function during operation will be deteriorated due to damage caused by the ridge edge A in the direction or the ridge edge B in the axial direction.

For mechanical devices that are set so that the large diameter end of the shaft remains open after assembly,
It is effective to protect the inner periphery of the oil seal by covering the shaft end with an extremely thin protective cap. In mechanical devices whose end sides are kept sealed, this type of measure cannot be used, since it is not possible to remove the protective cap after assembly.

This invention is used when inserting a shaft into an elastic ring, as in the above example, where the shaft end is formed with a larger diameter than the inner diameter of the elastic ring, which may damage the inner circumference of the elastic ring. The object of the present invention is to provide a shaft insertion jig for an elastic ring that can prevent damage to the elastic ring, and has the following configuration. That is, the shaft insertion jig for an elastic ring of the present invention is made of an elastic synthetic resin material, has a substantially semicircular shape, and has a thin hinge at one end so that the shaft insertion jig can swing relative to each other. two arcuate arms that are connected to each other and whose other ends abut each other to form a substantially circular shape; It has a lever, and an elastic ring support part integrally extending in the axial direction from the arcuate arm part and formed with a thin wall,
When the arcuate arms abut each other to form a substantially circular shape, the outer diameter of the thin elastic ring support is set to be kept slightly smaller than the inner diameter of the elastic ring to be inserted. Ru.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention and their operating conditions will be described with reference to the drawings. The shaft insertion jig for an elastic ring shown in FIGS. 2 and 3 is made of a synthetic resin material with elasticity, such as polypropylene, and has substantially semicircular shapes that abut each other to form a substantially circular shape. An arcuate arm portion 9, a hinge portion 10 that is thinly formed and connects the ends of both arcuate arm portions 9 to each other in a swingable manner, and a hinge portion 10 that extends outward from the hinge portion side end of the arcuate arm portion 9. It has an extending lever 11 that extends, and an elastic ring support part 12 that extends in the axial direction from the arcuate arm part 9 and is formed thin.
By keeping the opening angle between 1 and 11 large, the outer diameter of the elastic ring support part 12 can be made smaller than the inner diameter of the elastic ring to be inserted in the free state, and both expansion levers 11 , 11, the spacing between the ends of the elastic ring supports 12, 12 can be made larger than at least the diameter of the smallest diameter portion of the shaft 1.

The combination of the oil seal and the shaft using the elastic ring shaft insertion jig described above is performed according to the following procedure. First, as shown in FIG. 4, the oil seal 5 fitted into the housing 6
The large diameter end 3 of the shaft 1 is inserted into the arcuate arm 9 while the elastic ring support 12 is expanded by the expansion lever 11, and the large diameter end 3 is inserted into the arcuate arm 9. After passing through the elastic ring support part 12, the elastic ring support part 12 is removed from the oil seal 5, and the arcuate arm part 9 and the elastic ring support part 12 are moved to the middle small diameter part of the shaft 1, and then as shown in FIG. As shown in FIG. , the sealing sliding part 2 of the shaft 1 is connected to the oil seal 5
The assembly work is completed by mating the two. As shown in FIG. 5, by suspending the spring member 14 between the expansion levers 11, which urges the arcuate arms 9, 9 toward each other, the expansion levers 11 can be expanded. It is convenient because the attachment elastic ring can be easily inserted, expanded, and removed from the inserted shaft.

The shaft insertion jig of the present invention has the above-mentioned structural requirements, thereby achieving the following effects. Two arcuate membrane portions each having a substantially semicircular shape are swingably connected to each other by a thin hinge portion, and extend integrally from the arcuate arm portion in the axial direction. The inner circumferential portion of the elastic ring is expanded by inserting the elastic ring support portion into the elastic ring, and bringing integrally formed expansion levers that extend outward from the arcuate arm portions toward each other. , the large diameter part of the shaft is configured to pass through, so the structure is simple and manufacturing, handling, and operation are extremely easy.Moreover, the inner circumference of the elastic ring is protected when the large diameter part of the shaft passes through. is completely done.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a mechanical device constituted by a combination of a shaft and an elastic ring, which is the object of the present invention, and FIGS. 2 and 3 show an embodiment of the present invention. 3 is a plan view, FIG. 3 is a sectional view at the position indicated by the arrow - in FIG. 2, and FIGS. It is a sectional view showing the situation. DESCRIPTION OF SYMBOLS 1... Shaft, 2... Sealing sliding part, 3... Large diameter end, 5... Elastic ring, 6... Housing, 9... Arc-shaped arm part, 10... Hinge part, 11... Expansion lever, 1
2... Elastic ring support portion, 14... Spring member, A... Circumferential edge, B... Axial edge.

Claims (1)

[Scope of utility model registration request] It is formed of a synthetic resin material with elasticity into a substantially semicircular shape, one end of which is connected to be relatively swingable by a thin hinge part 10, and the other end of which is abutted against each other to form a substantially circular shape. two arcuate arm portions 9, 9, and expansion levers 11, 11 that integrally extend outward from the ends of the arcuate arm portions 9, 9 on the hinge portion 10 side; The arcuate arm portions 9, 9
and thin elastic ring support parts 12, 12 extending integrally in the axial direction.