JPS6224866Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device that prevents fluid leakage between members that reciprocate and/or rotate relative to each other.

Conventionally, sealing devices such as hydraulic or pneumatic actuating cylinders or power steering devices (also referred to as power steering) for vehicles, etc., have relatively reciprocating and/or rotating movements as shown in FIGS. 1 to 4. A mounting groove 3 provided in the cylindrical outer surface 2 of the inner member 1 of the two members with cylindrical surfaces, a cylindrical inner surface 5 of the outer member 4, and a mounting groove 3 provided in the mounting groove 3. The seal ring 10 is made of synthetic resin or synthetic rubber and has an outer surface 6 in sliding contact with the inner surface 5 of the outer member 4 and has a convex portion 8 on the inner surface 7.

However, since the seal ring 10 made of synthetic resin or synthetic rubber has a larger linear expansion coefficient depending on temperature than the inner and outer members 1 and 4, when the temperature decreases, the seal ring 10 contracts as shown in FIG. A gap is created between the outer surface 6 of the ring 10 and the inner surface 5 of the outer member 4, and with the end surface 11 of the seal ring 10 in contact with the side surface 12 of the mounting groove 3, the end surface 11 of the seal ring 10 When fluid pressure is applied in the direction of the arrow in the figure from the side that is in contact with the side surface of the mounting groove 3, it is difficult for the fluid pressure to enter the inner surface 7 of the seal ring, resulting in insufficient sealing performance.

The present invention has been made to eliminate the above-mentioned drawbacks, and is to provide a sealing device with excellent sealing performance by ensuring that fluid pressure enters the inner surface of the seal ring.

Therefore, a mounting groove provided on the outer surface of the inner member of the members that relatively move reciprocatingly and/or rotatably, an inner surface of the outer member, and an outer surface of the outer member that is mounted in the mounting groove. A sealing device comprising a synthetic resin or synthetic rubber seal ring that slides on the inner surface of the seal ring and has a convex portion and/or a concave portion on the inner surface, wherein one or more notches are provided at the corner of the end surface of the seal ring with the outer surface. It is made up of the following.

Next, the present invention will be explained with reference to drawings of embodiments.

An embodiment of the sealing device of the present invention is shown in FIGS. 5 to 7, which shows an inner member 1 of the members that make a relative reciprocating motion and/or rotational motion of an operating cylinder such as a hydraulic or pneumatic cylinder, that is, a piston. a mounting groove 3 provided on the outer surface 2 of the outer member 4, that is, an inner surface 5 of the cylinder tube; In a sealing device comprising a seal ring 10 made of synthetic resin or synthetic rubber and having a planar convex portion 8, the seal ring 10
One or more notches 13 are provided at the corner of the left end surface 11 of the outer surface 6.

8 and 9, the temperature decreases and a gap is created between the outer surface 6 of the seal ring 10 and the inner surface 5 of the outer member 4, and the left end surface 11 of the seal ring 10 When fluid pressure in the direction of the arrow in the figure is applied from the left side while the seal ring 10 is in contact with the left side surface 12 of the mounting groove 3, the fluid pressure is applied to the left end surface 11 of the seal ring 10.
It enters the notch 13 provided at the corner with the outer surface 6. Then, since the seal ring 10 is pushed to the right, the left end surface 11 of the seal ring 10 separates from the left side surface 12 of the mounting groove 3. Fluid pressure therefore enters the inner surface 7 of the seal ring and the outer surface 6 of the seal ring 10.
is pressed against the inner surface 5 of the outer member 4, and the sealing performance is improved.

10 and 11, another embodiment of the seal ring used in the sealing device of the present invention is shown in FIGS.
A notch 13 is provided at the corner of the outer surface 6.

Furthermore, another embodiment of the seal ring used in the sealing device of the present invention is shown in FIGS. A notch 13 is provided at the corner with 6.

As described above, the sealing device of the present invention has one or more notches formed at the corner of the end surface of the seal ring with the outer surface, so that fluid pressure can reliably enter the inner surface of the seal ring. A sealing device with excellent properties is provided.

[Brief explanation of the drawing]

1 to 4 show conventional examples, and FIGS. 5 to 13 show examples of the present invention. 1st, 5th, 1st
Figures 0 and 12 are cross-sectional views of the seal ring;
Figures 11 and 13 are front views of the seal ring,
Figures 4, 7, 8, and 9 are cross-sectional views of the sealing device. 1 is an inner member, 3 is a mounting groove, 4 is an outer member, 8 is a convex portion, 9 is a concave portion, 10 is a seal ring,
13 is a notch.

Claims (1)

[Scope of utility model registration request] A mounting groove provided on the outer surface of the inner member of the members that make relative reciprocating and/or rotational movements, an inner surface of the outer member, and an inner surface of the outer member that is mounted in the mounting groove and whose outer surface is the inner surface of the outer member. A sealing device comprising a seal ring made of synthetic resin or synthetic rubber that slides into contact with the inner surface and has a convex portion and/or a concave portion on the inner surface, wherein one or more notches are provided at the corner of the end surface of the seal ring with respect to the outer surface. A sealing device characterized by being provided with.