JP2562543Y2 - X-ring and its mold - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ring used for, for example, a shaft sealing portion of various devices, and a molding die thereof.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional X-ring of this type. That is, the X-ring 100 has two lips 10 at the inner and outer diameters, respectively.
1, 102, 103 and 104, and the cross section of the X ring 100 has an inclination with respect to the axial center line a of the diameter of the X ring 100 and the axial center line b of the cross section of the X ring 100. Rather, they are almost parallel.

A molding die for molding such an X ring 100 has a cavity 106 having the same shape as the X ring 100 as shown in FIG.
In the section 06, similarly to the section of the X ring 100, the axial center line c of the molding die and the axial center line d of the section of the cavity 106 have no inclination and are substantially parallel to each other.

[0004] The molding die comprises a pair of upper and lower dies which open and close in the vertical direction.
05A. A mold 105 shown in FIG. 4A has a cavity 106 for molding the X-ring 100.
The upper die 107 and the lower die 10 along the radial center line of the section of
8 and the mold 105A shown in FIG.
Is a lip 1 of one inner diameter shown by X ring 100
01 is divided into an upper mold 109 and a lower mold 110 by the maximum diameter of the lip 104 having the other outer diameter.

[0005]

However, in the case of the above-mentioned prior art, the X ring 1 by the molding die 105 is used.
00 After release, the two lips 101, 102, 103, and 104 of the inner and outer diameters are forcibly removed at the convex portions 111 and 111 'of the molding die 105, so that a material having a hard rubber hardness or a material having a small elongation is used. In the case of (1), there is a drawback that the inner diameter portion is cracked particularly in a small diameter product.

[0006] Similarly, in the molding die 105A of FIG. 4B, the convex portions 111A and 111A 'of the molding die 105A are similarly provided.
As a result, the inner ring of the X ring 100 was cracked.

The present invention has been made in order to solve the above-mentioned problems of the prior art.
An object of the present invention is to provide an X-ring capable of facilitating mold release after ring molding and a molding die thereof.

[0008]

According to the present invention, there is provided an X-ring having two lips each at the inner and outer diameters. Is inclined with respect to the center line in the axial direction.

An X-ring forming die for forming an X-ring cavity having two lips each on the inner and outer diameters between a pair of mating surfaces arranged to be openable and closable along a predetermined direction. And the center line in the axial direction of the cavity and the center line in the axial direction of the cross section of the cavity are inclined, and the mold is divided into a maximum diameter portion of the outer diameter lip portion and a minimum diameter portion of the inner diameter lip portion of the cavity. Configuration.

[0010]

In the X-ring and the molding die therefor, the X-ring has a cross-section in which the axial centerline of the diameter of the X-ring and the axial centerline of the cross-section are inclined. Similarly, the cross-section of the cavity of the molding die in which the axial center line of the cavity cross-section and the axial center line of the molding die are inclined, and the tip of the convex portion of the molding die and the lip of the inner and outer diameters are also inclined. The length between the tips becomes shorter, and the mold release after X-ring molding becomes easier.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. FIG. 1 shows an X-ring according to an embodiment of the present invention.
The X-ring 1 generally has two inner and outer lips 2, 3, 4, and 5 respectively at the inner and outer diameters.

The inner and outer lips 2, 3, 4,
Numeral 5 is made of a rubber-like elastic body and has a tongue-shaped cross-section, and its inner and outer lips 2, 3, 4, and 5 are connected in a rounded X-shaped cross-section.

Therefore, the two inner lips 2, 3 on the inner diameter side
Are extended inward and outward in the axial direction, respectively, and are inclined inward in the radial direction. The two outer diameter lips 4, 5 on the outer diameter side extend inward and outward in the axial direction, respectively, and are inclined in the radially outward direction. ing.

In the cross section of the X ring 1, the center line A in the axial direction of the diameter of the X ring 1 and the center line B in the axial direction of the cross section of the X ring 1 are inclined counterclockwise at a required angle θ. ing.

FIG. 2 shows a mold 6 for the X-ring 1. The molding die 6 has a rectangular cross section and includes a pair of an upper die 7 and a lower die 8 which are arranged to be freely opened and closed in a vertical direction. A cavity 9 for forming the X-ring 1 is formed between the upper mold 7 and the lower mold 8 at the mating surface.

The shape of the cavity 9 is the same as the shape of the X ring 1 and the cross section is a rounded X-shape.
The inner diameter and the outer diameter lip portions 10, 11, 12, and 13 of the X ring 1 to become the inner diameter and the outer diameter lips 2, 3, 4, and 5 have a tongue shape in cross section. And two inner diameter lip portions 1 on the inner diameter side
Reference numerals 0 and 11 extend inward and outward in the axial direction, respectively, and are inclined inward in the radial direction.
Reference numeral 3 extends inward and outward in the axial direction, and is inclined outward in the radial direction.

As in the case of the X-ring 1, the cross-section of the cavity 9 is such that the center line C in the axial direction of the mold 6 and the center line D in the cross-section of the cavity 9 correspond to the inclination angle of the X-ring 1. Tilt counterclockwise with θ.

The upper die 7 and the lower die 8 of the molding die 6 are the minimum diameter portions of the inner diameter lip portions 10 and 11 because the cavity 9 is inclined in the counterclockwise direction at the angle θ. It is composed of a minimum diameter portion of the lower inner diameter lip portion 11 and a maximum diameter portion of the upper outer diameter lip portion 12 which is a maximum diameter portion of the outer diameter lip portions 12 and 13.

In the X-ring and the molding die having the above configuration, since the cavity 9 of the molding die 6 is inclined counterclockwise at an angle θ, the tip of the upper inner diameter lip portion 10 and the inner diameter of the molding die 6 Between the tip of the inner diameter convex portion 14 on the side, that is, the forcible removal amount E on the inner diameter side at the time of mold release, and the outer diameter lip portion 13 on the lower side.
Between the front end of the molding die 6 and the front end of the outer diameter convex portion 15 on the outer diameter side of the molding die 6, that is, the length of the forcible removal amount F on the outer diameter side at the time of release, becomes shorter. The mold becomes easy, and cracking defects at the inner diameter of the X ring 1 are eliminated.

In the actual use of the X-ring 1, the inclination of the angle θ is corrected by being attached to a groove (not shown) of the mating member, so that there is no problem.

In the above embodiment, the X-ring 1 and the cavity 9 of the molding die 6 have a cross section inclined at an angle θ in a counterclockwise direction. Can be applied.

Also, the description has been made with reference to the upper die 7 and the lower die 8 as the matching of the molding die 6, but the present invention is not limited to this, and the direction of the matching may be changed according to the molding state.

[0023]

The present invention has the above-described structure and operation, and the cross-section of the X-ring is inclined because the axial centerline of the diameter of the X-ring and the axial centerline of the cross-section are inclined. Similarly, in the cross section of the cavity of the mold for molding the X-ring, the center line in the axial direction of the mold and the center line in the axial direction of the cavity also incline, and the tip of the convex portion of the mold and the inner and outer diameters of the cavity are inclined. The length between the tips of the lips is shortened, the mold release after X-ring molding is facilitated, and cracking failure of the X-ring does not occur. Therefore, it becomes unnecessary to select the defective crack.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of an X-ring according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of an X-ring forming die according to an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part of a conventional X-ring.

FIG. 4 is a vertical sectional view of a main part of a conventional X-ring forming die, and FIG. 4 (a) is a die-cut type at a radial center line of a cross-section of the X ring; b) is a mold type in which the minimum diameter portion of the inner diameter lip of the X-ring and the maximum diameter portion of the outer diameter lip are used.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 X ring 2, 3 inner diameter lip 4, 5 outer diameter lip 6 molding die 7 upper die 8 lower die 9 cavity 10. , C, D center line E, F

Claims (2)

(57) [Scope of request for utility model registration] 1. An X having two lips each on the inside and outside diameters.
An X-ring, wherein an axial centerline of a diameter of the X-ring and an axial centerline of a cross section thereof are inclined. 2. An X-ring forming die for forming an X-ring cavity having two lips each at an inner and outer diameter between a pair of mating surfaces arranged to be openable and closable in a predetermined direction. And the center line in the axial direction of the cavity and the center line in the axial direction of the cross section of the cavity are inclined, and the mold is divided into a maximum diameter portion of the outer diameter lip portion and a minimum diameter portion of the inner diameter lip portion of the cavity. A molding die for an X-ring.