JPS6234019Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for assembling an end wall member at a cylindrical open end of various housings such as a pump housing.

Conventionally, for example, a cylindrical open end 11 of a pump housing 10 constituting a pump device shown in FIG.
When assembling the end wall member 12 that closes the opening end to the cylindrical opening end 11, as shown in FIG. The end wall member 12 is prevented from coming off by fitting a snap ring 14 into the end wall member 12 and engaging the snap ring 14 with an annular tapered surface 12a chamfered on the back of the outer periphery of the end wall member 12. In such an assembly structure, when the end wall member 12 is removed, the seal member S provided on the outer periphery of the end wall member 12 may be damaged by the knife edge formed on the outer edge of the annular groove 13. . In addition, in order to deal with such problems, the third
As shown in the figure, when the annular tapered surface 13a is chamfered on the outer edge of the annular groove 13, the depth D of the annular groove 13 becomes shallower and the snap ring 1
4 can easily come off, the outer periphery back 12b of the end wall member 12 is formed into a cylindrical step, and the distance between the snap ring 1 and the tapered surface 13a on the side of the annular groove 13 is adjusted so that the snap ring 1
It needs to be narrower than the outer diameter dimension of 4. Therefore, in the assembly structure having such a configuration, when assembling the end wall member 12, the end wall member 12 is further spaced by an interval corresponding to the length of the cylindrical step portion 12b compared to the one in FIG. As a result, it is necessary to increase the amount of deflection of the wave spring 15 (see FIG. 1) assembled to the inner end surface of the end wall member 12, and the overall length of the housing becomes longer. The end wall member 12 requires extra processing, which is disadvantageous for mass-produced products.

In order to solve the above-mentioned problems, the present invention provides an assembly structure in which the amount of pushing inward of the housing when assembling the end wall member is small, and there is no risk of breaking the snap spring and seal member when removing the end wall member. The present invention has been devised, and its implementation will be described below with reference to FIG.

FIG. 4 shows a pump housing 10 constituting the pump device shown in FIG. 1, similar to FIGS. 2 and 3.
The present invention is shown in a state in which the present invention is applied to the cylindrical open end 11 of the end wall member 2 fitted to the open end 11.
An annular tapered surface 22a that engages with the snap ring 14 is chamfered on the outer circumferential back of the snap ring 2, and an annular groove 23 with a semicircular cross section that is bored in the inner circumferential wall of the open end 11 has a chamfered annular tapered surface 22a on the outer circumferential back of the snap ring 14. An annular tapered surface 23a that guides the snap ring 14 during attachment and detachment is chamfered. Therefore, in this embodiment, the chamfering angle α of the annular tapered surface 22a is made larger than the chamfering angle β of the annular tapered surface 23a, so that the distance between the two annular tapered surfaces 22a and 23a facing each other is directed outward. Snap spring 14
Its structural feature lies in the fact that it is narrower than the outer diameter of.

As a result, when assembling the end wall member 22, the end wall member 22 can be pushed into the open end 11 until the minimum distance between the annular tapered surfaces 22a and 23a is slightly larger than the outer diameter of the snap ring 14. Therefore, the snap ring 14 can be easily fitted into the annular groove 23, and when the snap ring 14 is fitted, the annular tapered surface 22a is moved by the repulsive force of the wave spring 15 assembled to the inner end surface of the end wall member 22. is engaged with the snap ring 14 to prevent the end wall member 22 from coming off, and in this assembled state, the distance between the annular tapered surfaces 22a and 23a becomes narrower than the outer diameter of the snap ring 14 toward the outside. , the snap spring 14 is reliably prevented from coming off. Further, when removing the end wall member 22, the snap ring 14 can be removed by slightly pushing the end wall member 22 into the open end 11 in the same way as when assembling as described above. Since it is guided by, it is easy to remove, and when the end wall member 22 is removed, there is no risk of breaking the seal member S provided on the outer periphery of the end wall member 22.

As understood from the above explanation, in the present invention, the outer peripheral back of the end wall member 22 and the annular groove 2
These portions are chamfered on the outer edge of the snap ring 14 to form annular tapered surfaces 22a and 23a, and the opposing distance between the two annular tapered surfaces 22a and 23a is set outward from the outer diameter of the snap ring 14. By making the spring narrower, the snap spring 14 that fixes the end wall member 22 can be assembled with a small amount of pushing, and as a result, the amount of deflection of the spring installed on the inner end surface of the end wall member can be reduced. It can be implemented without increasing the axial length of the housing.

In the above embodiment, an example in which the present invention is applied to the cylindrical open end of a pump housing is described, but the present invention is not limited to this, and can also be applied to the cylindrical open end of various types of housings. It can be implemented similarly.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a pump device to which the present invention is applied, Figs. 2 and 3 are partially enlarged sectional views showing a conventional assembly structure, and Fig. 4 is a section showing an assembly structure of the present invention. It is an enlarged sectional view. Explanation of the symbols: 11... Cylindrical open end of the housing, 14... Snap ring, 22... End wall member, 23... Annular groove, 22a, 23a... Annular tapered surface.

Claims (1)

[Scope of utility model registration request] A snap spring is fitted into an annular groove having a semicircular cross section formed on the inner peripheral wall surface of the cylindrical opening end of the housing, a sealing member is fitted around the outer periphery, and the snap spring is fitted into the opening end and springs toward the opening end. In the assembly structure in which the biased end wall member is prevented from coming off by the snap spring, an annular tapered surface is formed by chamfering the outer edge of the annular groove and the outer periphery back of the end wall member. and an end wall member for a pump housing or the like, characterized in that the chamfer angles of both the annular tapered surfaces are different so that the distance between the two annular tapered surfaces facing each other is directed outward to be narrower than the outer diameter of the snap ring. assembly structure.