JPS591336B2 - Exhaust port structure of rotary piston engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust port structure for a rotary piston engine, and particularly to an improvement in an exhaust port structure consisting of a plurality of exhaust port groups that start opening at different times.

In a general Nilokuri piston engine.

By providing multiple independent exhaust ports that start opening at different times, the opening area of the openings changes gradually as the rotor rotates, and rapid expansion of the working gas inside the exhaust boat is suppressed. .

It is known that as a result, generation of unpleasant high-frequency exhaust noise can be prevented.

By the way, 1. Normally, a boat insert member is attached to the exhaust port with a predetermined heat insulating space formed between it and the inner wall to prevent the temperature of the exhaust gas flowing through the exhaust port from decreasing. In the case of a conventional exhaust port structure, there is a problem in that the structure is extremely complicated.

In particular, in such exhaust port constructions, each opening is placed very close to each other so that they begin to open at slightly different times, resulting in a thinner bulkhead between each opening and a thinner boat insert. It was very difficult to form one enlarged recess in each opening for inserting the.

The present invention has been made to eliminate one or more of the disadvantages and includes forming a plurality of independently opening openings in the casing and a single enlarged recess communicating downstream with the openings. , an insert member is formed from the same number of cylindrical members as the openings and a mounting member having a communication hole continuous with the cylindrical member, and the insert member is inserted into the side wall of the enlarged recess and a predetermined gap between the cylindrical member and the cylindrical member. To provide an exhaust port structure for a rotary piston engine that is simple in structure and has good heat retention by holding and fitting the exhaust port and forming a plurality of mutually independent exhaust ports with an opening and a cylindrical member. 8 targets.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 to 3 show an exhaust port structure according to an embodiment of the present invention, in which 1 is a rotor housing;
The rotor housing 1 has a trochoidal inner peripheral surface 1a, and side housings 2 are arranged on both sides of the trochoidal inner peripheral surface 1a, and the rotor housing 1 and the side housings 2 form a casing 18.

In addition, an eccentric shaft (not shown) is provided in the rotor housing 1.
A substantially triangular rotor 3 that is supported by and rotates planetarily.
An apex seal (not shown) is provided at the apex of the rotor 3 to maintain airtightness of the working chamber formed by the trochoid inner peripheral surface 1a of the rotor housing 1 and the flank surface 3a of the rotor 3. It is provided.

Further, the rotor housing 1 is formed with an intake port 4 for introducing working gas into the casing 18 and an exhaust port 5 for discharging the working gas.

By the way, this exhaust port 5 has the following structure.

That is, the rotor housing 1 has three openings 6, 7 .
8 are provided to open independently in the casing 18, and each opening 6, 7, 8 starts opening at different times as the top of the rotor 3 moves in the direction indicated by the arrow in the figure. It is set in.

Further, on the exhaust gas downstream side of the openings 6, 7, 8, one enlarged portion 9 is provided in communication with the openings 6, 7.8.

Furthermore, the insert member 10 includes three cylindrical members 11.
12° 13 and a mounting member 17 having three communicating holes 14, 15, 16 continuous to the cylindrical members 11, 12, 13, and this insert member 10 is formed by welding the cylindrical member 11, 12, and 13 are fitted into the enlarged four part 9 so as to maintain a predetermined gap from the side wall of the enlarged four part 9.

The exhaust port 5 has three independent exhaust ports each consisting of openings 6, 7, 8 and cylindrical members 11, 12.degree. 13.

According to the exhaust port structure of this embodiment configured as described above, one enlarged four part 9 communicates with each opening 6, 7.8.
In addition, each opening 6, 7.8 is formed in this enlarged four part 9.
One insert member 10 having a corresponding cylindrical member 11° 12.13 is fitted to form three mutually independent ports, so an exhaust port with a simple structure can be easily and compactly formed. can.

In addition, since the openings 6° and 7.8 are provided at different times when they begin to open, the opening area of the openings 6 and 7.8 changes gradually, preventing the generation of unpleasant high-frequency exhaust noise. In addition, since a sufficient gap is provided between the side wall of the enlarged portion 9 and the cylindrical members 11, 12, 13 of the insert member 10, the heat of the exhaust gas can be prevented from escaping from the port side wall, and the temperature of the exhaust gas can be reduced. Deterioration can be sufficiently prevented.

As described above, according to the present invention, in the exhaust port structure of a rotary piston engine, a plurality of openings that open independently in the casing and a single enlarged portion communicating with the openings on the downstream side are provided. An insert member is formed from the same number of cylindrical members as the openings and a mounting member having communication holes continuous to the cylindrical member, and the insert member is inserted into a predetermined space between the enlarged four-part side wall and the cylindrical member. By fitting with gaps and forming multiple independent exhaust ports with the opening and the cylindrical member, we have created an exhaust port with a simple structure that has good heat retention for exhaust gas.

It has the effect of being easily and compactly formed.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of a rotary piston engine having an exhaust port structure according to an embodiment of the present invention, FIG. 2 is a cutaway front view of the main part of FIG. It is an enlarged sectional view taken along the B line. 5...Exhaust port, 18...Casing, 6°7.8...Opening, 9...Enlarged four parts, 10... Insert member, 11, 12
, 13... Cylindrical member. 14.15,16...Communication hole, 17...
・Mounting parts.

Claims (1)

[Claims] 1. In a rotary piston engine equipped with a plurality of exhaust ports that start opening at different times, a plurality of openings that open independently in a casing, and a single enlarged recess that communicates with the openings on the downstream side. forming an insert member from the same number of cylindrical members as the openings and a mounting member having a communication hole continuous with the cylindrical member, and inserting the insert member between the enlarged recess side wall and the cylindrical member. 1. An exhaust port structure for a rotary piston engine, characterized in that a plurality of mutually independent exhaust ports are formed by the opening and the cylindrical member, which are fitted with a predetermined gap therebetween.