JPH0450433Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a sealing device for a rotary piston engine.

(Prior Art) Conventionally, for example, a polygonal rotor is mounted inside a casing formed of a rotor housing having a trochoidal inner circumferential surface and side housings that are in close contact with each other on both sides of the rotor housing. Suction, compression, and planetary rotation while in contact with each other
A rotary piston engine that performs explosion, expansion, and exhaust strokes is known (see, for example, Japanese Utility Model Application No. 72936/1983).

The sealing device for such a rotary piston engine includes a side seal between the side housing and the rotor that prevents gas from blowing from the working chamber to the eccentric shaft side, and an aperture to prevent gas blowing between adjacent working chambers. In addition to the corner seal and the corner seal that seals between the side seals at the corner portion, the corner seal and the apex seal are fitted and inserted into the corner seal and elastically support the apex seal end. It consists of a soft seal that seals between the

(Problem that the invention aims to solve) However, even in such a product, a gap is formed between the side seal and the corner seal in consideration of thermal expansion differences and manufacturing errors, so the compression stroke and expansion During the stroke, gas leaks from the working chamber to the eccentric shaft side through the gap, causing a decrease in output.

It is also possible to inject filler into the above gap, but the gap is very small and if filler is injected, the rate of compression of the filler due to thermal expansion of the side seal will be very large, so it is not practical. However, implementation is difficult.

The present invention has been made in view of the above, and aims to provide a sealing device for a rotary piston engine that improves the sealing performance between the side seal and the corner seal and prevents gas leakage between them. .

(Means for solving the problem) In order to achieve the above object, the present invention provides a soft seal that is inserted into the soft seal groove inside the corner seal and elastically supports the end of the apex seal. While the seal extension is formed, a soft seal extension groove is formed in the corner seal that extends to the end of the side seal groove formed in the rotor, and the soft seal extension is fitted and inserted into the soft seal extension groove.

(Function) By fitting and inserting the soft seal extension into the soft seal extension groove, the soft seal extension extends to the end of the side seal groove (side seal), improving the sealing performance between the side seal and the corner seal. It increases.

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

In FIG. 1, 1 is a polygonal rotor, 2 is a rotor housing, which has a trochoidal inner peripheral surface 2a therein, and a casing 4 is constituted by side housings 3 disposed on both sides. The rotor 1 is located at its top (apex seal 1 to be described later).
1) is adapted to perform planetary rotation while slidingly in contact with the inner circumference 2a of the rotor housing 2.

Above rotor housing 2, side housing 3
and a working chamber 5 of variable volume by the rotor 1;
6 and 7 are configured to prevent gas leakage between the top of the rotor 1 and the inner circumferential surface 2a of the rotor housing 2, and between the side surface of the rotor 1 and the side housing 3. Various seals are provided to maintain the airtightness of 6 and 7.

That is, the rotor 1 has an apex seal groove 8 and a corner seal groove 9 formed at its top.
Further, a side seal groove 10 is formed on the side surface of the rotor 1 along the rotor circumferential surface, and the apex seal groove 8, corner seal groove 9, and side seal groove 10 are formed on the side surface of the rotor 1.
An apex seal 11, a round pin-shaped corner seal 12, and an arch-shaped side seal 13 are respectively fitted and inserted into the housing. These seals 11,
Springs (only the corner seal spring 14 is shown) are arranged on the back surfaces of the springs 12 and 13.

Further, a soft seal groove 15 having a circular cross section is formed approximately concentrically in the center of the corner seal 12, and the soft seal groove 15 has a round shape that elastically supports the end of the apex seal 11. A pin-shaped soft seal 16 is fitted and inserted. Therefore, the end of the apex seal 11 is fitted through the corner seal 12 and is elastically supported by the soft seal 16 (see FIG. 2).

The corner seal 12 has a soft seal groove 1.
A soft seal extension groove 15a extending from 5 to the end of the side seal groove 10 is recessed, and the soft seal extension groove 15a smoothly continues with the end of the side seal groove 10. On the other hand, the soft seal 16 is formed with a soft seal extension part 16a corresponding to the soft seal extension groove 15a, and the soft seal extension part 16a is formed at the end of the side seal groove 10 and the soft seal extension groove 15a.
is inserted and mated to.

As a result, the end of the soft seal extension 16a comes into elastic contact with the end of the side seal 13,
Even without creating the gap that was conventionally formed between the end of the side seal and the corner seal, thermal expansion of the side seal 13 and manufacturing errors can be reduced by reducing the soft seal extension 1.
It is absorbed and relaxed by the elastic deformation of 6a.

With the above configuration, the end of the side seal 13 comes into contact with the end of the soft seal extension 16a, eliminating the gap between the side seal and the corner seal that existed in the past, thereby improving gas sealing performance. This makes it possible to reduce gas leakage from the working chamber to the eccentric shaft side.

Further, since the end of the side seal 13 and the soft seal extension 16a are in elastic contact, no extra force is applied to the end of the side seal 13, and the end of the conventional side seal and the corner seal are in contact with each other. It is possible to prevent the end portion of the side seal from being worn out due to contact between the side seal and the side seal.

(Effect of the invention) As described above, the present invention provides the soft seal with a soft seal extension part, forms a soft seal extension groove in the corner seal that extends to the end of the side seal groove, and forms a soft seal extension groove in the soft seal extension groove. Since the extension part is fitted and inserted, sealing performance around the corner seal is improved, gas leakage from the working chamber to the eccentric shaft side is prevented, and output can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of a rotary piston engine, and FIG.
FIG. 3 is an enlarged view of part A in the figure, and FIG. 3 is a sectional view taken along the - line in FIG. 2. 1... Rotor, 8... Apex seal groove, 9
...Corner seal groove, 10...Side seal groove,
11...Apex seal, 12...Corner seal, 13...Side seal, 15...Soft seal groove, 15a...Soft seal extension groove, 16...
Soft seal, 16a...Soft seal extension.

Claims (1)

[Scope of utility model registration request] In a rotary piston engine in which a rotor rotates planetarily within a casing, an apex seal groove, a corner seal groove, and a side seal groove are formed in the rotor, and the apex seal, corner seal, and side seal are fitted into each seal groove. A soft seal groove is formed inside the corner seal, and a soft seal that elastically supports the end of the apex seal is fitted and inserted into the soft seal groove, and a soft seal extension is inserted into the soft seal. A rotary piston engine characterized in that a soft seal extension groove is formed in the corner seal and extends to an end of the side seal groove, and a soft seal extension part is fitted and inserted into the soft seal extension groove. sealing device.