JPH0610084Y2 - Corner piston device for rotary piston engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a corner seal device which is fitted into fitting holes formed at the top of each triangular rotor of a rotary piston engine and holds both ends of an apex seal. Regarding the improvement of.

(Prior Art) Generally, a triangular rotor rotates in a planetary manner in a casing consisting of a rotor housing having a trochoid inner peripheral surface and side housings arranged on both sides of the rotor housing, and suction,
In a rotary piston engine configured to continuously repeat compression, explosion, and exhaust strokes, an apex is used to gas-seal a variable volume working chamber defined by an inner surface of a casing and a rotor flank. sticker,
Side seals and corner seals are mounted on the rotor, respectively.

FIG. 4 is a side view of the rotor 1, 2 is a side seal groove formed in an arc shape along three edges of the side surface of the rotor 1, 3 is a groove into which an apex seal is fitted, and 4 is a 5 is a bottomed fitting hole into which the corner seal 5 as shown in FIG. 5 is fitted. The corner seal 5 fitted into the fitting hole 4 is made of a metal material, and as shown in FIG. 5, the corner seal 5 slides on the cylindrical outer peripheral surface 5a and the inner wall surface of the side housing of the engine casing. A flat end face 5b in contact with the through hole 6 which is eccentric to the axis of the cylinder and penetrates in the axial direction;
The through hole 6 is formed so as to communicate with the through hole 6 from the wall portion 5c whose diametrical width is thin due to the eccentricity of the through hole 6 and the outer peripheral surface of the corner seal 5 opposite to the wall portion 5c side. And a split groove 7 into which the apex seal is inserted, and is formed in a C shape. Since the diametrical width of the wall portion 5c is thinner than the width of the other portion, the corner seal 5 has a width D that can be increased or decreased in the corner seal 5, that is, in the radial direction. Has some elasticity.

The corner seal 5 having such a structure has a spring for biasing the corner seal 5 toward the inner wall surface of the side housing, as disclosed in, for example, Japanese Utility Model Laid-Open No. 55-139201. The outer peripheral surface 5a of the corner seal 5 in a state of being interposed between the end surface on the side opposite to the end surface 5b side slidably contacting the inner wall surface and the bottom surface of the fitting insertion hole 4.
And the inner peripheral surface 4a of the fitting insertion hole 4 is inserted in the fitting insertion hole 4 in a mode in which a minute gap ΔC is interposed.

Therefore, the end surface 5b of the corner seal 5 is constantly pressed against the inner wall surface of the side housing by the urging force of the spring, and the corner surface between the inner wall surface of the side housing and the side surface of the rotor 1 as the rotor 1 rotates. Following the variation of the distance, it slides in the fitting insertion hole 4 in the axial direction, thereby ensuring the sealing property with respect to the inner wall surface of the side housing.

Further, as disclosed in the above publication, the corner seal 5 has a good sealability by fitting an auxiliary seal member made of a soft member such as a rubber material into the through hole 6.

By the way, when the corner seal 5 as shown in FIG. 5 is fitted into the fitting hole 4 and the above ΔC is large, the airtightness is poor and the output is insufficient and the fuel consumption characteristic is deteriorated.

Therefore, although it is necessary to make the gap ΔC interposed between the outer peripheral surface 5a of the corner seal 5 and the inner peripheral surface 4a of the fitting hole 4 as small as possible, the conventional method as shown in FIG. The corner seal 5 is constructed as a one-piece type, and is usually relatively thick with a diameter of about 11 mm and about 7 mm, so that it is not sufficiently elastic in the radial direction. If you reduce too much, the outer peripheral surface of the corner seal 5
The frictional resistance between 5a and the inner peripheral surface 4a of the insertion hole 4 becomes large,
As a result, the corner seal 5 becomes difficult to move only by the urging force of the spring interposed between the corner seal 5 and the bottom surface of the fitting insertion hole 4, and the corner seal 5 may be fixed in the fitting insertion hole 4. Yes, for that, the conventional corner seal 5
In the above configuration, ΔC cannot be reduced so much, which is one of the factors that hinder the improvement of the sealing property.

(Purpose of the Invention) In view of the above-mentioned circumstances, the present invention provides a sealing property by the configuration of the corner seal capable of reducing the gap ΔC between the outer peripheral surface of the corner seal and the inner peripheral surface of the fitting hole. It is an object of the present invention to provide a corner seal device having improved performance.

(Constitution of the Invention) The corner seal device according to the present invention has a three-piece type corner seal, which has an end face that is in sliding contact with the inner wall surface of the side housing and is elastic in the radial direction. An intermediate member made of a V-shaped first metal member, a second metal member with which the spring contacts, and a rubber material sandwiched between the first and second metal members and slidingly contacting the inner peripheral surface of the fitting insertion hole. And a member.

(Effect of the Invention) According to the present invention, since the corner seal is formed in a three-piece type, the first C-shaped member that slidably contacts the side housing.
The thickness of the metal member is inevitably thinner than that of the conventional one-piece type corner seal, so that sufficient radial elasticity can be imparted to the first metal member. Therefore, the gap Δ between the outer peripheral surface of the first metal member and the inner peripheral surface of the fitting insertion hole Δ
Even if C is made small, the sliding of the corner seal in the fitting insertion hole is not hindered, and there is no possibility of sticking in the fitting insertion hole, and the sealing property can be improved by making the gap ΔC sufficiently small. .

In addition, since the intermediate member made of a rubber material interposed between the two metal members is in sliding contact with the inner peripheral surface of the fitting insertion hole, the sealing property is dramatically improved. Moreover, since the intermediate member made of this rubber material is sandwiched between the two metal members, there is no possibility of being directly exposed to the combustion gas, so there is no problem in terms of durability.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to FIGS.

The corner seal 10 according to the present invention includes an end member 11 made of a metal material having a sliding surface 11a for a side housing of a rotary piston engine, an intermediate member 12 made of a rubber material, and an intermediate member from a side opposite to the end surface member 11 side. A three-piece type is constituted by the end face member 13 made of a metal material and in contact with the member 12.

The end surface member 11 made of a metal material having the sliding surface 11a is
Similar to the conventional corner seal 5 shown in FIG. 5, it is formed in a C shape with a split groove 14 and a through hole 15 into which an apex seal is inserted, but the thickness is the same as the conventional corner seal. It is formed thinner than 5 (the thickness of the corner seal 5 is 7 mm, whereas the thickness of the member 11 is 3 mm), and its through hole 15 is also larger than the through hole 6 of the conventional corner seal 5. By having a diameter, greater elasticity is imparted in the radial direction. Further, the intermediate member 12 made of a rubber material is formed into a disc shape with a diameter dimension capable of closely adhering to the inner periphery of the corner seal fitting insertion hole 4, and is provided with a groove 16 into which an apex seal is inserted. A circular protrusion 17 that is inserted into the through hole 15 of the end member 11 is integrally provided on the surface of the member 11 side. This protrusion 17
Functions as the auxiliary seal member described above. Further, the other end surface member 1 made of a metal material with which the spring 20 abuts
No. 3 is formed in a disk shape and is provided with a groove 18 into which an apex seal is inserted and is not provided with elasticity, but is formed to have a diameter slightly smaller than that of the end surface member 11, and ΔC
Is designed to be relatively large so as not to stick to the insertion hole 4.

In this way, the three-piece type corner seal 10 is a fitting insertion hole formed in the rotor 1 as shown in FIGS. 2 and 3 in a state in which the three members 11, 12, and 13 are overlapped. 4 is inserted via the spring 20.

The above is an example of the configuration of the corner seal device of the rotary piston engine according to the present invention. Since the end face member 11 having the sliding surface 11a is thin and the through hole 15 is formed larger than the conventional one, Sufficient elasticity is provided, and therefore ΔC can be made sufficiently small without fear that the end surface member 11 will be fixed to the fitting insertion hole 4, and the intermediate member 12 made of a rubber material that is closely attached to the back surface thereof is fitted. Since it adheres to the inner peripheral surface of the insertion hole 4, the sealing property can be dramatically improved. Moreover, since the end face member 13 made of a metal material is in close contact with the back surface of the intermediate member 12, the intermediate member 12 is not directly exposed to the combustion gas, so that the deterioration of the intermediate member 12 can be prevented.
Further, by integrally forming the circular protrusion 17 that is fitted into the through hole 15 of the end member 11 on the intermediate member 12, it is not necessary to separately provide an auxiliary seal member.

[Brief description of drawings]

1 is an exploded perspective view of a corner seal according to the present invention, FIG.
FIG. 3 is a front view of a main portion of a rotor equipped with a corner seal according to the present invention, FIG. 3 is a sectional view taken along line III-III of FIG. 2, and FIG. 4 is a front view of a rotor of a rotary piston engine. FIG. 5 is a perspective view of a conventional corner seal. DESCRIPTION OF SYMBOLS 1 ... Rotor, 4 ... Corner seal fitting hole 10 ... Corner seal, 11, 13 ... End surface member 12 ... Intermediate member, 14 ... Split groove 15 ... Through hole, 17 ... Projection 20 ... Spring

Claims (1)

[Scope of utility model registration request] 1. A corner seal having an end face that is in sliding contact with an inner wall surface of a side housing and having a split groove into which an apex seal is inserted is inserted into a bottomed circular fit insertion hole formed in a rotor. It is fitted and inserted so as to be slidable in the axial direction of the hole and urged toward the inner wall surface of the side housing by a spring interposed between the corner seal and the bottom surface of the fitting insertion hole. In a corner seal device for a rotary piston engine, the corner seal has an end face that is in sliding contact with an inner wall surface of the side housing, and is provided with elasticity in the radial direction.
A second metal member having a V-shape, and the second spring in contact with the spring
A rotary piston engine comprising a metal member and an intermediate member made of a rubber material which is interposed between the first and second metal members and is in sliding contact with the inner peripheral surface of the fitting insertion hole. Corner sealing device.