JPH0223761Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a corner seal device for a rotary piston engine, and particularly relates to an improvement of a corner seal plug in which a corner seal plug is installed in a through hole of a corner seal.

(Prior art) Conventionally, as a corner seal device for a rotary piston engine, as disclosed in, for example, Japanese Utility Model Application Publication No. 55-94402, a corner seal groove provided on the top side of the rotor is provided with a through hole that penetrates in the axial direction. A corner seal having a split groove that communicates with the through hole and through which the apex seal is inserted is biased toward the side housing via a spring and installed, and the bottom of the apex seal is inserted into the through hole of the corner seal. This is equipped with a corner seal plug made of soft material that has an apex seal insertion groove into which the corner seal is inserted, and the through hole gives elasticity to the corner seal in the radial direction to ensure good sealing performance with the corner seal groove. In addition, a corner seal plug is known in which the corner seal plug prevents gas from blowing through the through hole of the corner seal.

(Problem to be solved by the invention) However, in the above-mentioned conventional device, the bottom of the apex seal is inserted into the apex seal insertion groove of the corner seal plug that is installed in the through hole of the corner seal, so it is difficult to manufacture. If the above error exists, there is a problem that when inserting and assembling the apex seal, the apex seal cannot be smoothly inserted into the apex seal insertion groove, resulting in poor assembly performance. However, if the apex seal insertion groove is made large for this purpose, a problem arises in that the effect of preventing gas blow-through is weakened.

The present invention was devised in view of these points, and its purpose is to provide stretchability to the apex seal insertion groove by improving the structure around the apex seal insertion groove of the corner seal plug. Furthermore, the apex seal can be inserted and assembled smoothly even with manufacturing errors, and the sealing performance is improved by pressing the apex seal insertion groove into contact with the apex seal using gas pressure. It is in.

(Means for solving the problem) In order to achieve the above-mentioned object, the solution of the present invention is a rotary piston equipped with a corner seal plug having an apex seal insertion groove in the through hole of the corner seal as described above. In the corner seal device for an engine, a recess is provided on the side surface of the corner seal plug opposite to the side housing, the recess being hollowed out from the bottom of the apex seal insertion groove to both sides and communicating with the apex seal insertion groove; The opening end into the apex seal insertion groove is formed into a lip shape extending inward of the recess.

(Function) With the above configuration, the present invention provides elasticity to the apex seal insertion groove by providing the corner seal plug with a recess that is hollowed out from the bottom of the apex seal insertion groove to both sides. This elasticity allows the apex seal to be smoothly inserted into the apex seal insertion groove even if there are manufacturing errors.

In addition, by making the opening end of the recess into the apex seal insertion groove into a lip shape that extends inward, the lip is pressed from its back side by the gas pressure flowing into the recess, and the lip is pushed toward the apex seal. Since it is extruded and deformed and comes into pressure contact with the apex seal, it not only prevents gas from blowing out but also further improves the sealing performance.

The recessed portion is provided on the opposite side of the corner seal plug from the side housing.
Since the recess does not penetrate to the side housing side, gas does not blow through through the recess.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 4 shows a rotor 1 in a rotary piston engine, and the rotor 1 is formed into a polygonal shape and is composed of a rotor housing having a trochoidal inner circumferential surface and side housings disposed on both sides of the rotor housing (not shown). The inside of the casing is planetarily rotated, and as the rotor 1 rotates, air is sucked into the working chamber formed by the rotor 1 and the casing.
Compression, explosion, expansion, and exhaust strokes are performed in sequence. A rotor recess 2 for a combustion chamber is formed on each rotor flank surface 1a of the rotor 1, and an apex seal groove 3 for mounting an apex seal is formed on each top of the rotor 1 on the rotor side surface. Side seal grooves 4 for mounting side seals are formed in 1b, and corner seal grooves 5 for mounting corner seals 7, which will be described later, are formed on the top side surface of the rotor 1. Moreover, 6 is an oil seal groove for mounting an oil seal formed on the rotor side surface 1b.

In the corner seal groove 5, there are
As shown in the figure, a cylindrical corner seal 7 is mounted via a spring (not shown), and is urged toward the side housing by the spring so as to come into sliding contact with the side housing. The corner seal 7 has a through hole 8 that penetrates in the axial direction, and a split groove 9 that communicates with the through hole 8 and into which the apex seal 10 is inserted, and provides elasticity in the radial direction to form the corner seal. Sealing performance between the outer circumferential surface of the corner seal groove 7 and the inner circumferential surface of the corner seal groove 5 is ensured.

Furthermore, a cylindrical corner seal plug 11 made of a soft material is tightly fitted into the through hole 8 of the corner seal 7, and the corner seal plug 11 is attached to the groove 9 of the corner seal 7. It has an apex seal insertion groove 12 with a cross-sectional shape extending in the axial direction into which the bottom of the apex seal 10 is inserted, and when the apex seal 10 is inserted, the through hole 8 of the corner seal 7 is inserted.
This is to prevent gas from blowing through.

As a feature of the present invention, the side surface 11a of the corner seal plug 11 opposite to the side housing is hollowed out from the bottom of the apex seal insertion groove 12 to both sides, as shown in FIG. A recess 13 is formed which communicates with the Tux seal insertion groove 12, and the recess 13 is provided from the side surface 11a of the corner seal plug 11 opposite to the side housing to near the midway point in the axial direction, and penetrates to the side housing side. do not have. Further, the opening end of the recess 13 into the apex seal insertion groove 12 is formed into a lip shape extending inward of the recess 13 to form lip portions 14, 14.

Therefore, in the above embodiment, the bottom of the apex seal 10 is fitted into the corner seal plug 11 that is attached to the through hole 8 of the corner seal 7 to prevent gas from blowing through the through hole 8. Since the apex seal insertion groove 12 to be inserted is provided with a recess 13 hollowed out from the bottom to both sides, the recess 13 allows the apex seal insertion groove 12 to have elasticity. As a result, even if there is a manufacturing error when inserting and assembling the apex seal 10, it can be absorbed by the elasticity and the apex seal 10 can be smoothly inserted into the apex stall insertion groove 12. It can be inserted and the ease of assembly can be improved.

Further, since the opening end of the recess 13 into the apex seal insertion groove 12 is formed into lip portions 14, 14 extending inward of the recess 13, the water flows into the recess 13 as shown in FIG. The gas pressure (indicated by the arrow) presses the lip portions 14, 14 from the back side as shown by the broken line, and the lip portions 14, 14 are pushed out and deformed toward the apex seal 10 so as to narrow the width of the apex seal insertion groove 12. , this causes the lips 14, 14 to form the apex seal 1.
Since it comes into pressure contact with both sides of 0, the sealing performance can be significantly improved. In that case, the recessed portion 13 is provided on the side surface 11a of the corner seal plug 11 opposite to the side housing, and does not penetrate to the side housing side, so that the original effect of preventing gas blow-through of the corner seal plug 11 is secured, and the above-mentioned seal is can guarantee improved sexual performance.

(Effects of the invention) As explained above, according to the corner seal device for a rotary piston engine of the present invention, the apex seal insertion groove of the corner seal plug is made elastic by the recess, so that it can be easily manufactured. Even if there is the above error, the apex seal can be inserted smoothly into the apex seal insertion groove, improving ease of assembly, and the opening end of the recess into the apex seal insertion groove is shaped like a lip. Since the lip portion is brought into contact with the apex seal using gas pressure, it is possible to not only ensure the prevention of gas blow-through but also to further improve the sealing performance, thereby improving the ease of assembly and gas sealing performance. It is possible to achieve both.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a rear view showing the assembled state of a corner seal and a corner seal plug, FIG. 2 is a perspective view of the same, and FIG. 3 is a sectional view of the corner seal plug. , FIG. 4 is a perspective view of the rotor. 1... Rotor, 5... Corner seal groove, 7...
Corner seal, 8... Through hole, 9... Division groove, 10
... Apex seal, 11 ... Corner seal plug, 12 ... Apex seal insertion groove, 13 ...
... recessed part, 14... lip part.

Claims (1)

[Scope of utility model registration request] In the corner seal groove provided on the top side of the rotor,
A corner seal having a through hole that penetrates in the axial direction and a split groove that communicates with the through hole and into which the apex seal is inserted is mounted and biased toward the side housing by a spring, and the apex is inserted into the through hole of the corner seal. In a corner seal device for a rotary piston engine equipped with a corner seal plug made of a soft material and having an apex seal insertion groove into which the bottom of the Tux seal is inserted, the apex is installed on the opposite side of the corner seal plug to the side housing. A recess is provided which is hollowed out from the bottom of the apex seal insertion groove to both sides and communicates with the apex seal insertion groove, and the opening end of the recess to the apex seal insertion groove has a lip shape extending inward of the recess. A corner seal device for a rotary piston engine, characterized in that: