JPS6330665A - V packing - Google Patents

Abstract

PURPOSE:To improve abrasion resistance in V packing and stability at the time of its installation, by setting it so as to make a gash angle of a V-groove larger than an apex angle of the crest part, in case of the V packing whose cross section is formed into a V-shaped form and a ringlike form. CONSTITUTION:V packing 1 is formed into a ringlike form as a whole, and a gash angle alpha of a V-groove 3 at one side of a body 2 is set to 120 deg. and an apex angle beta of a crest part 4 at the other side to 90 deg., respectively. In case of actual application, the required numbers of V packing 1A and 1B are stacked inside a seal box 6 and charged. Under this state, when shoulder parts 1a and 1a of the V packing 1 are bent inward, the gash angle alpha is slightly deformed and this gash angle alpha is made so as to be deformed as far as almost 110 deg., there is produced some clearance between these shoulder parts 1a and 1a of V packing 1A and a waist part of V packing 1B. Therefore, excessive pressure- contact between the shoulder part 1a and the waist part is prevented from occurring, and a wedge angle of the shoulder part 1a is largely eliminated. Accordingly, not only abrasion resistance is improvable but also stability at the time of installation can be elevated.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a V-packet, and particularly to a V-packet used for sealing the sliding parts of reciprocating shafts of excavators, polling pumps, plunge pumps, etc. ri°ru.

(Conventional technology) Generally, reciprocating # is used on the shaft of excavation machines and plunger pumps.
A gasket is installed between the JI member and the fixed bearing that slidably supports it.

These packings are usually used in stacks, and each packing has a V-shaped cross section, and the groove angle of the groove and the apex angle of the peak are equal to 90°. is frequently used.

(Problem to be Solved by the Invention) When these packings are used for high-speed reciprocating motion and high hydraulic oil pressure, the lips of the packings tend to wear out, and as a result, Maintenance management was troublesome, such as having to replace it with a new one after use.

In addition, this type of V packing is usually used by stacking three or more b's, and the V i of adjacent packing
A gap is likely to occur between the groove angle of M and the top of the crest. As a result, the V-packs tend to bounce during operation, causing vibrations, and also, as one part of the groove and the waist of the lip come into excessive contact, there is the problem that the shoulders of the groove tend to wear out. there were. When press-fitting the V-packet into the seal box, press 9 of the V-packet 10 as shown in Figure 4.
As shown by the broken line, the portion 10a is bent inward to a free state (the groove angle α of V, which was set at 90°, is deformed to a smaller value than 90°. As a result, as shown in FIG. As is clear from this, a gap 11 is created between the peak of the adjacent V-packet and ViM.

Therefore, an object of the present invention is to provide (1) a gasket which has excellent wear resistance and excellent stability during installation.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a package having a V-shaped cross section and an annular shape, in which the groove angle of the groove is larger than the apex angle of the peak. It is characterized by being set so that Further, according to the present invention, the groove angle of the groove is
The angle is set at 20°, and the apex angle of the peak is set at 90°.

(Example) Hereinafter, an example of the packing according to the present invention will be described with reference to the drawings.

FIG. 1 shows a cross section of a V-packet 1 according to the present invention, and this V-packet 1 has a ring-like shape as a whole, and a V iM 3 is formed on one side of the main body 2. A mountain portion 4 is formed on the other side surface. According to this example, the groove angle α of the V 2M3 is set to 120°, and a relief 5 is formed in the center of the groove. On the other hand, the apex angle β of the mountain portion 4 is set to 90°.

The above-mentioned groove angle α and apex angle β are not limited to the number shown in the figure, and according to the experiments conducted by the present inventors, the apex angle β is 70”.
or more, and the difference between the apex angle β and the groove angle α is at least 10°
It was confirmed that this is a good thing. If the apex angle β is less than 70°, the wall thickness of the shoulder portion becomes thinner, causing a problem.

Further, according to the present invention, (1) The main body 2 of the packing 1 is manufactured by joining a number of tape-shaped base fabrics impregnated with phenol resin in a layered manner by applying rubber glue between them.

Next, the outline of the packing manufacturing method according to the present invention will be explained in the order of steps.

1) Apply rubber glue to both sides of a base fabric such as cotton.

2) Cut the base fabric with rubber glue into a cape shape.

3) Cut to a predetermined length.

4) Fold it so that the cross section has a dogleg shape.

5) Join both ends to form a ring.

6) A plurality of pieces of this ring-shaped molding material are hand-kneaded, placed in a mold, heated, and vulcanized.

7) Press the kjJ mold and the II mold in the mold, and shape the grooves so that the groove angle is 120' and the peak angle is 90°.

The V-packet according to the present invention is manufactured through the various steps described above.

To actually use the V-packet described above, as shown in FIG. 3, a required number of V-packets 1A are required.

1B should be stacked and loaded into the seal box 6. In this state, the shoulders 1a, 1a of the packing 1 will bend inward, the groove angle α will be slightly deformed, and the groove angle α will increase to 110°. If you make it deform, ■ the shoulder part of the patchkin 1A and the V barragin 1B
There will be a slight gap between the waist and the waist.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the groove angle of the ■groove of the packing is set larger than the apex angle of the crest, so the wedge angle of the shoulder can be made larger, resulting in improved wear resistance. gets better. Also, when two or more V-packs are overlapped, the shoulders are pressed inward and deform into a position where the groove angle of the V-groove becomes smaller, leaving a slight roundness. Excessive pressure welding can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a part of the ■V packing according to the present invention, Fig. 2 is an explanatory diagram showing a state in which two V packings are stacked, and Fig. 3 is a cross-sectional view showing a part of the V packing according to the present invention. V
FIG. 4 is a cross-sectional view showing a conventional packing. FIG. 5 is an explanatory diagram showing the condition of two conventional packing. 1...■Patsukin, 2...Main body, 3...V full, 4
...Yamabe. Applicant's agent Mr. Sato - $4 times

Claims (1)

[Claims] 1. In a V-packing having a V-shaped cross section and an annular shape,
A V-packing characterized in that the groove angle of the V-groove is set to be larger than the apex angle of the peak. 2. The V-packing according to claim 1, wherein the groove angle of the V-groove is approximately 120°, and the apex angle of the peak portion is approximately 90°.