JPS5910446Y2 - Patsukin - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a packing that is attached to a sliding part, and more specifically, it relates to a packing that has excellent sealing performance under a wide range of operating temperatures.

A conventional packing technology that is similar to the present invention is to use a Y-shaped packing with an O-'J ring fitted into a shallow groove on the pressure-receiving side. It is known that the surface pressure of the seal lip is created by applying pressure to the seal lip of the seal lip.
(see publication).

With this packing, the O-ring fitted into the shallow groove cannot be deformed within both seal lips, causing it to warp and break at the axial rear of both seal lips, or the compressive deformation force of the O-ring is strong, causing the seal lip to It has the disadvantage of excessive surface pressure.

In particular, when the operating temperature is low and the elasticity of the O-IJ ring decreases, the O-ring cannot deform and the surface pressure of the seal lip increases abnormally, increasing the sliding resistance as a packing.
It has the drawback of eventually causing damage.

The purpose of this invention is to solve the above-mentioned drawbacks.The purpose of this invention is to optimize the surface pressure of the sealing lip of the packing without causing excessive deformation or undesirable stress to the packing. The purpose of the present invention is to provide a packing that has a sealing property that is not sealed.

The feature of the present invention is that seal knobs that swell in the radial direction are provided on the inner circumferential surface and outer circumferential surface of the annular main body made of rubber-like elastic material on the pressure receiving side in the axial direction. By providing an annular groove extending in the direction, a bifurcated longitudinal cantilever beam extending toward both seal knobs is formed, and an annular body made of a rubber-like elastic material is fitted into the bottom of the annular groove. In the packing, the entire annular body is located on the opposite side of the axial pressure receiving side 10 from the line connecting both lips and at the base of the cantilever beam, so as to act elastically on the cantilever beam. This is the point I made.

The rubber-like elastic material of the main body is preferably rubber or resin.

Furthermore, the rubber-like elastic material of the annular body is preferably a rubber material that does not lose its elasticity even at low temperatures; for example, silicone rubber is suitable.

Further, the annular groove is a deep groove that remains even when the annular body is fitted therein, and suitable shapes for the bottom of the annular groove include a trapezoid, a square, etc. in addition to a circular cross section.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view of the packing of the present invention.

The main body 1 is made of a rubber-like elastic material made of urethane rubber, and has an annular body with a rectangular cross section.

The axial pressure receiving sides 10 of the inner circumferential surface 2 and outer circumferential surface 3 of this main body have seal lips 4 and 5 that swell in the radial direction, respectively.

Further, an annular groove 7 having a depth approximately twice the diameter of an annular body 9 (described later) is provided in the axial direction from the pressure receiving side 6 of the main body 1, and the bottom side of this annular groove 7 is connected to both seal lips 4, 5. Two-pronged cantilever beams 11 and 12 are extending.

An annular body 9 having a shape that fits into the bottom of the annular groove is fitted into the bottom of the annular groove.

This annular body 9 is a rubber-like elastic material, which is better than silicone rubber material.

Furthermore, although the annular body 9 that fits into the bottom of the annular groove 7 has a circular cross section, it is known that optimum elastic force can be obtained by selecting a semicircular or trapezoidal shape as required.

This arrangement of packings may be used singly, or a plurality of packings may be arranged in series.

Next, FIG. 2 shows another embodiment.

The structure is almost the same as in Figure 1.

A particular difference is that the annular body 9 is fitted with a semicircular cross section.

The packing of the present invention constructed as described above provides the following effects.

By providing a deep annular groove 7 in the axial direction from the pressure-receiving side surface 6 of the main body 1, bifurcated cantilevers 11 and 12 extending toward both seal lips can be formed, and the bottom of the annular groove 7 can be Since the annular body 9 whose elasticity does not change much is fitted, even when the packing is used at low temperatures,
Due to the elastic force of the annular body 9 and the lever action of the cantilevers 11 and 12 using the annular body 9 as a fulcrum, the sealing performance of the seal lips 4 and 5 can be maintained.

Furthermore, even if the compressive deformation of the annular body 9 is small, the cantilever beams 11,
12 has a certain length, it acts like an elastic beam and does not increase the surface pressure of the seal lips 4, 5.
It does not increase sliding resistance.

In addition, since the materials of the main body 1 and the annular body 9 can be appropriately selected,
For example, by making the main body 1 of urethane rubber and the annular body 9 of silicone rubber, the operating temperature conditions of the packing can be -
Even at 40°C to 100°C, stable sealing performance can be obtained as the seal knobs 4 and 5.

By providing the cantilever beams 11 and 12 as described above, the present invention can provide a packing that has sealing properties that are not affected by operating temperature conditions without causing excessive deformation or undesirable stress to the packing. can.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view of a packing showing an embodiment of the present invention;
FIG. 2 is a half sectional view showing another embodiment. 1... Main body, 2... Inner peripheral surface, 3... Outer peripheral surface, 4...
... Seal lip, 5... Seal lip, 6... Pressure receiving side, 7... Annular groove, 9... Annular body, 10...
・Pressure receiving side, 11...cantilever beam, 12...cantilever beam.

Claims (1)

[Scope of utility model registration request] Main body 1 made of rubber-like elastic material and having an annular shape
By providing seal lips 4 and 5 that bulge in the radial direction on the axial pressure receiving sides 10 of the inner circumferential surface 2 and outer circumferential surface 3, respectively, and providing an annular groove 7 extending in the axial direction from the pressure receiving side 6 of the main body, both the above-mentioned In a certain packing, a bifurcated longitudinal cantilever beam 11, 12 extending toward the seal lip side is formed, and an annular body 9 made of a rubber-like elastic material is fitted into the bottom of the annular groove. 9 is entirely located on the opposite side of the pressure receiving side 10 in the axial direction from the line connecting the two lips 4 and 5.