JPH0214939Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a seal ring mounting jig, and in particular, to a seal ring mounting jig that is optimal for mounting a seal ring into an annular groove bored in a piston body. Regarding the jig.

[Conventional technology]

As a seal ring installation jig, conventionally,
For example, there are proposals as shown in FIGS. 3 and 4.

That is, as shown in FIG. 3, this conventional seal ring mounting jig includes a slide jig 1 disposed at one end of the piston body P, and a slide jig 1 that connects the piston body P through the slide jig 1. A pushing jig 2 for pushing the seal ring R into the annular groove D, and a fourth
As shown in the figure, it consists of a correction jig 3 for tightening and correcting the seal ring R inserted in the annular groove D of the piston body P. The pushing jig 2 for pushing the seal ring R into the annular groove D of the piston body P can be expanded by a split 2a formed so that its thickness is reduced in the axial direction. , the slide jig 2 has its outer surface 1a
The seal ring R is slid while being expanded. Furthermore, since the seal ring R interposed in the piston body P has been expanded once, it is corrected by the correction section 3a of the correction jig 3 in order to tighten it.

Therefore, in the case of the conventional slide jig 1,
The outer surface 1a of the pushing jig 2 has a ground finish, and the pushing jig 2 is formed into a cylindrical shape with an appropriate thickness as a whole, and the straightening jig 3 has the following features:
A thick correction portion 3a is formed.

[Problem that the invention attempts to solve]

However, the above-mentioned conventional proposal has the following disadvantages.

That is, since the outer surface 1a of the slide jig 1 is finished by grinding, the outer surface 1a is
When the seal ring R slides on the slide jig 1, the inner circumferential surface of the seal ring R is likely to be scratched, reducing the durability of the seal ring R. There is also the disadvantage that rust is likely to occur in 1a, making storage troublesome.

In addition, the pushing jig 2 is expanded during use, but repeated use of the expansion causes permanent deformation, making it impossible to obtain the necessary inner tension force, which is disadvantageous. If the wall thickness is large in order to obtain the necessary inner tension force, there is also the disadvantage that it becomes difficult to pull out after use. Note that when the wall thickness is made small, there is also the inconvenience that an auxiliary rubber band or the like must be attached to the outer periphery of the pushing jig 2 in order to obtain the necessary tension force.

Furthermore, in the case of the correction jig 3, since the seal ring R once expanded must be installed in the annular groove D of the piston body P with an appropriate tightening force, the correction part 3a has a large wall thickness. Therefore, even if the piston body P is to be pulled out after the desired correction, there is an inconvenience that it cannot be pulled out easily.

[Purpose of invention]

Therefore, in view of the above-mentioned circumstances, the present invention has been developed to provide a seal ring installation method that does not reduce the durability of the seal ring, is easy to store, does not cause permanent deformation, is easy to remove, and has excellent workability. The purpose is to provide a new jig for use.

[Means for solving problems]

In order to solve the above problems, the configuration of the present invention includes: a slide jig disposed on the piston body; a pushing jig for pushing the seal ring into the annular groove of the piston body through the slide jig; In the seal ring mounting jig, which includes a correction jig for correcting the seal ring inserted in the annular groove of the piston body, the slide jig has a polished outer surface on which the seal ring slides, and , the outer surface is surface-treated, the pushing jig is made of resin, and the thickness of the middle part is thinner than the thickness of both ends in the axial direction, and the straightening jig is made of resin. The present invention is characterized in that it has an opening behind the straightening section at the intermediate portion in the direction, through which a piston body to which a straightened seal ring is attached can be inserted.

〔Example〕

Hereinafter, the present invention will be explained based on the illustrated embodiments.

As shown in FIGS. 1 and 2, the seal ring mounting jig according to the present invention includes a slide jig 11
, a pushing jig 12 , and a straightening jig 13 .

The slide jig 11 is disposed at one end of the piston body P, and is formed with a tapered surface so that the seal ring R can slide and expand on its outer surface 11a. has been done. Therefore,
In this embodiment, the slide jig 11 is as follows:
The outer surface 11a is polished and finished,
The outer surface 11a is subjected to surface treatment such as hard chrome plating.

As a result, in the slide jig 11, the sliding properties of the seal ring R, the wear resistance of the sliding surface, and the rust prevention effect can be easily obtained.

The pushing jig 12 is the sliding jig 1
The seal ring R is formed to allow the seal ring R to be pushed into the annular groove D of the piston body P through the seal ring R, and is formed so that its thickness is reduced in the axial direction. It has a split 12a.

Due to the formation of the split 12a, the pushing jig 12 expands when sliding the seal ring R on the outer surface 11a of the slide jig 11. and,
In order to make it easy for the pushing jig 12 to expand and return to its original shape, in this embodiment, the wall thickness of the axially intermediate portion 12b is set at both ends 12c.
It is formed so that it is smaller than the wall thickness of.

That is, the intermediate portion 12b is sufficient as long as it can transmit the acting force in the axial direction acting on the pushing jig 12, and the emphasis is on making it easy to expand by reducing the wall thickness. , both ends 1
In order to compensate for the necessary inner tension force, 2c is made thicker only in this region.

Further, in this embodiment, the pushing jig 12 is made of, for example, a phenolic resin to prevent permanent deformation due to repeated use, and the inner circumferential edge of the end thereof is formed against the outer surface 11a of the slide jig 11. Care is taken to prevent the so-called galling phenomenon from occurring.

The correction jig 13 is formed to tighten and correct the seal ring R inserted in the annular groove D of the piston body P, as shown in FIG. A thick correction portion 13a is formed in the axially intermediate portion.
An open portion 13b is provided continuously behind the correction portion 13a, that is, on the lower end side in FIG.

The opening portion 13b is formed to have a size such that the inner diameter of the correction portion 13a substantially matches the outer diameter of the piston body P, that is, the opening portion 13b is formed so that the piston body P is tightly fitted into the correction portion 13a. The piston body P is formed to have a large inner diameter so that the piston body P can easily fall off.

As a result, the seal ring R inserted in the annular groove D of the piston body P by the sliding jig 11 and the pushing jig 12 is moved into the straightening jig 1.
1 through the guide portion 13c and forcibly fitted into the correction portion 13a, the slide jig 11 that is expanded when sliding on the outer surface 11a of the slide jig 11 is It will be tightened to
It will be installed in the annular groove D with the desired tightening margin, and after the tightening correction is completed,
The correction jig 13 can be easily removed through the open portion 13b.

In addition, in the correction jig 13, it goes without saying that a guide part 13c is connected to the correction part 13a on the front side of the correction jig 13a, that is, on the upper end side in FIG. And the guide section 13
c has a tapered surface on its inner circumferential surface, and the seal ring R pushed into the annular groove D of the piston body P is gradually tightened until it reaches the correction portion 13a.

[Effect of idea]

As described above, according to the present invention, since the outer surface of the slide jig becomes smooth, the seal ring can be expanded without reducing its durability, and it also has a rust-preventing effect. , which has the advantage of easy maintenance management.

Furthermore, according to the present invention, after the seal ring is pushed into the annular groove of the piston body, the pushing jig can be easily removed, and there is no need to prepare an auxiliary tool such as a rubber band. This has the advantage that the outer surface of the sliding jig is not scratched by the inner peripheral edge of one end of the pushing jig.

Further, according to the present invention, there is an advantage that the correction jig can be easily removed from the piston body after the seal ring pushed into the annular groove of the piston body has been corrected by a predetermined tightening.

As a result, according to the present invention, the seal ring can be attached to the piston body under excellent conditions.

[Brief explanation of the drawing]

Fig. 1 is a partially cut-away front view showing how the sliding jig and pushing jig according to the present invention are used, Fig. 2 is a partially cut-away front view showing the correction jig according to the present invention, and Fig. 3 4 is a partially cutaway front view showing a conventional slide jig and a pushing jig, and FIG. 4 is a partially cutaway front view showing a conventional correction jig. 11...Slide jig, 11a...Outer surface, 1
2...pushing jig, 12a...splitting, 12b...
... Middle part, 12c ... Both ends, 13 ... Correction jig, 13a ... Correction part, 13b ... Open part, 13
c...Guiding part, D...Annular groove, P...Piston body, R...Seal ring.

Claims (1)

[Scope of utility model registration request] A slide jig disposed on the piston body, a pushing jig for pushing the seal ring into the annular groove of the piston body through the slide jig, and a seal ring inserted in the annular groove of the piston body. In a seal ring mounting jig consisting of a correction jig for straightening, the slide jig has an outer surface on which the seal ring slides is polished and a surface treatment is applied to the outer surface; is made of resin, and the wall thickness at the middle part is thinner than the wall thickness at both ends in the axial direction,
A seal ring mounting jig characterized in that the straightening jig has an opening behind the straightening section at an axially intermediate portion through which a piston body to which a straightened seal ring is mounted can be inserted.