JPS6341522Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a casing seal device for a rotary piston engine.

In a rotary piston engine, a polygonal rotor makes planetary rotation in a casing consisting of a rotor housing with a multi-arc inner surface and side housings placed on both sides of the rotor housing, sucking in, compressing, exploding, and expanding working fluid. and each discharge process. In this configuration,
The joint between the side housing and the rotor housing is required to have high sealing performance in order to prevent the coolant from leaking from the coolant passage into the working chamber and preventing the working fluid from entering the coolant passage.

As a sealing device for this purpose,
Publication No. 41041 proposes an annular sealing member consisting of a rubber main body and a heat-resistant layer placed on one side of the seal member, in which the rubber main body exerts elasticity and the heat-resistant layer protects the main body. . In order to manufacture a seal member having such a structure, it is necessary to join each other at one point in the circumferential direction, but there is no disclosure as to how to form the joint that forms this annular body. Conventionally, a structure as shown in FIG. 5 has been used as this type of seal member. That is, the sealing member 20 consists of a main body 16 made of rubber and heat-resistant layers 17 and 18 made of fluororesin etc. that are integrally arranged on both sides of the main body 16. Both ends of each are formed thin and overlapped, and are bonded with an adhesive 19. They are joined together to form an annular shape. In such a configuration, since the joint portion is mainly made of rubber, the restoring force tends to weaken due to compression in the attached state, and there is a drawback that sealing performance cannot be maintained for a long period of time.

This idea was made to eliminate these conventional drawbacks, and it has good sealing performance and excellent heat resistance, and the elasticity of the joint is also good, so it exhibits good sealing performance for a long time. A sealing device is provided.

In other words, this invention is an annular seal member having heat-resistant layers on both sides of a rubber main body, and one end of the joint is cut in steps at different positions in the circumferential direction of both heat-resistant layers and the main body. is,
Both ends were overlapped and bonded so that both heat-resistant layers at the other end and the main body integrally arranged between the two heat-resistant layers were located in the part from which the heat-resistant layer and the main body at this end were removed. It is something.

Hereinafter, embodiments of this invention will be described with reference to the drawings. The rotary piston engine shown in FIGS. 1 and 2 has a casing 1 and a rotor 2 supported by an eccentric shaft and rotating planetarily within the casing 1. The rotation of the rotor 2 draws working fluid from an inlet. The working fluid is sucked into the working chamber 3, undergoes compression and explosion strokes, and is then discharged as exhaust gas from an exhaust port (not shown).

The casing 1 is composed of a rotor housing 4 having a multi-arc inner surface and side housings 5 located on both sides of the rotor housing 4. The rotor housing 4 and the side housing 5 are integrally connected in the axial direction by a large number of tightening bolts 6. The rotor housing 4 is constructed by integrally joining an inner wall portion 7 and an outer wall portion 8 at a predetermined interval in the circumferential direction by ribs 9 or bosses 10, and has internal walls facing the coolant passage 11 of the side housing 5. It has a coolant passage 12. This inner wall part 7
An annular seal groove 15 in which a seal member 14 is mounted is provided on the side surface 13 of the rotor housing side, that is, the joint surface 13 on the rotor housing side.
It is equipped with

As shown in FIG. 3, the sealing member 14 has a heat-resistant layer 1 made of fluororesin or the like on both sides of a belt-shaped main body 16 made of rubber.
7 and 18 are integrally formed, the heat-resistant layer 17 is bonded to the main body 16, and the heat-resistant layer 18 is bonded to the main body 1.
6 is crimped. This sealing member 14 is arranged with its heat-resistant layer 18 on the working chamber side, with the heat-resistant layer 17 facing the coolant passage side, and the heat-resistant layer 18 blocks gas from the working chamber 3 and protects the main body 16. . The heat-resistant layer is not limited to heat-resistant synthetic resin such as fluororesin, but may also be made of metal such as copper or steel. In short, any material that thermally protects the rubber main body is sufficient.

The seal members 14 are joined to each other at one point in the circumferential direction to form an annular shape, and the joined portion is constructed as shown in FIG. 4. That is, at one end (the left side in FIG. 4), the heat-resistant layers 17 and 18 are cut at different positions in the circumferential direction, and the main body 16 is also cut approximately half way on the side in contact with the heat-resistant layers 17 and 18, respectively. is cut to match the thickness of the heat-resistant layers 17 and 18, and the heat-resistant layer 17 and the main body 16 form an extension 22 in which one heat-resistant layer 18 and the lower half of the main body 16 are removed. . At the other end (on the right side in FIG. 4), the main body 16 is formed thin and a stepped portion is formed in the heat-resistant layer 17, and a thin portion 24 is formed at the tip of this stepped portion. And this thin part 2
The extension portion 22 is superimposed on the top portion 4 and bonded with an adhesive 21. In the illustrated example, the thin portion 24
An extension part 23 of the heat-resistant layer 17 is further formed at the tip of the heat-resistant layer 17, and this is fitted into the other main body 16 in order to ensure complete bonding, but this extension part 23 does not necessarily need to be provided.

In the above structure, the rubber main body 16 is protected by a heat-resistant layer, and the main body occupies a larger proportion at the joint than in the conventional structure as shown in FIG. The main body exhibits sufficient elasticity and provides a good sealing effect for a long period of time. Note that if the heat-resistant layer between the main bodies at both ends of the joint shown in Fig. 4 is removed, the proportion of the main body will become larger, but in that case, the rigidity of the joint will be weakened, making it difficult to manufacture and assemble the seal member. It is not practical because it bends at the joint when being handled.

As explained above, this invention provides a sealing member for sealing between the rotor housing and the side housing of a rotary piston engine.
This prevents the elasticity of the joint from weakening and provides a good sealing effect over a long period of time.

[Brief explanation of drawings]

Fig. 1 is a vertical cutaway side view of a rotary piston engine equipped with a sealing device according to this invention;
The figure is a sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view taken along the - line in Fig. 2, Fig. 4 is a sectional view of the joint of the seal member, and Fig. 5 is a sectional view of the joint of the conventional structure. be. 3... Working chamber, 4... Rotor housing, 5...
...Side housing, 14...Seal member, 16
...Main body, 17, 18...Heat-resistant layer.

Claims (1)

[Scope of utility model registration request] A device for sealing between a rotor housing and a side housing in a rotary piston engine casing in which a rotor housing and a side housing each having a coolant passage are joined together so that the coolant circulates between the coolant passages. A sealing member consisting of a rubber band-shaped main body and a heat-resistant layer integrally arranged on both sides of the main body on the working chamber side and the coolant passage side has both ends joined to each other. It is formed into an annular shape, and at one end of this joint, both heat-resistant layers and the main body are cut in a stepped shape at different positions in the circumferential direction,
Both ends are overlapped so that the heat-resistant layers of the other stepped end and the main body integrally arranged between the two heat-resistant layers are located in the part from which the heat-resistant layer and the main body of this end are removed. A casing sealing device for a rotary piston engine, characterized in that the casing seal device is joined together.