JPS5833378B2 - rotary engine high-speed engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low engine engine, and more particularly to the structure of its exhaust port.

A polygonal rotor rotates eccentrically within a casing constituted by a rotor housing having a trochoidal inner circumferential surface and a side housing that closes both ends of the rotor housing, with its top end in contact with the inner circumferential surface of the rotor housing. In a so-called Wankel-type rotary engine that moves, an exhaust port is usually provided so as to open in a part of the inner circumferential surface of the rotor housing.

Exhaust gas discharged from such an exhaust port, that is, combustion gas, is introduced into a manifold reactor connected to the exhaust port for the purpose of achieving exhaust purification, which has become a particular problem in recent years. Measures are being taken to ensure complete combustion of the unburned components remaining in the fuel.

Such a manifold reactor makes the intake air mixture relatively rich, thereby increasing the exhaust gas temperature, and supplying sufficient secondary air into the exhaust gas to eliminate harmful unburnt components contained in the exhaust gas. Next, it is purified by reacting with the air.

The so-called Yururi Tsuchiriaku method, on the other hand, makes the intake mixture relatively thin, suppresses the amount of harmful unburned components discharged from the exhaust port to a relatively low level, and then removes the remaining harmful unburned components with the secondary air. Burn it in the reactor.

A so-called lean reactor method is known.

Among these, in the rich reactor method, the exhaust gas temperature is maintained relatively high, but there is a problem that the fuel consumption rate deteriorates considerably.On the other hand, in the lean reactor method, the exhaust gas is discharged from the exhaust port. Since the temperature of the exhaust gas is quite low, there is a problem that the purification performance inside the reactor will deteriorate significantly unless the heat loss that occurs in the exhaust gas on the way from the exhaust port to the manifold reactor is minimized as much as possible. .

Conventionally, in order to reduce the heat loss of exhaust gas in the exhaust passage, it has been considered not to provide a cooling water passage around the exhaust port and not to cool the exhaust port. In this case, the O-ring sealing between the rotor housing and the side housing is provided along the end face of the rotor housing, so the necessary cooling of the rotor housing is performed at the peripheral edge of the exhaust port. If not, there is a risk of thermal damage to the OIJ song in that area.

To address the above-mentioned problems, the peripheral wall of the exhaust port is constituted by a cantilevered sleeve-shaped inner wall member that is separated from the rotor housing body by an annular groove and is joined and supported by the rotor housing body at at least one end. The present application discloses an exhaust port structure that reduces heat loss of exhaust gas flowing through the exhaust port by effectively retaining heat of the exhaust port hm wall while providing necessary cooling to the O-ring. Japanese Patent Application No. 50-84822 and Japanese Patent Application No. 1984-84 filed by the same applicant as a person
It was proposed in No. 823.

The present invention further improves the heat loss of exhaust gas in the previously proposed exhaust port structure as described above, and provides an improved exhaust port structure for a low-rise engine that can minimize the heat loss. is intended to provide.

According to the present invention, the polygonal rotor has its top end connected to the rotor housing within a casing constituted by a rotor housing having a trochoidal inner circumferential surface and a side housing that closes both ends of the rotor housing. In the structure of the exhaust port portion opening into the rotor housing of a rotary engine of the type that eccentrically rolls while being in contact with the inner peripheral surface of the rotor housing, the peripheral wall portion of the exhaust port is formed by an annular groove substantially surrounding the rotor housing. An inner wall member in the form of a cantilevered sleeve is connected to and supported by the rotor housing main body at an inner end on a side closer to the inner circumferential surface of the trochoid separated from the main body, and the inner circumferential surface of the inner wall member includes a port liner that is substantially separated by a gap from the inner circumferential surface of at least a joint portion of the inner wall member to the rotor housing body and carried by the rotor housing body portion at a non-joint portion of the inner wall member. This is achieved by an exhaust port structure such as the one shown in FIG.

According to this structure, the wall portion of the exhaust port is configured to include an inner wall member that is substantially separated from the rotor housing main body portion by the annular groove, and the inside of the annular groove is left as an air layer with low thermal conductivity. Moreover, a port liner is disposed on the inner circumferential surface of the inner wall member and is substantially separated from the inner circumferential surface of the joint portion to the rotary housing main body by a gap, and the gap between the facing wall member and the port liner is arranged. By remaining as an air layer with low thermal conductivity,
The cooling effect exerted by the exhaust port wall on the exhaust gas flowing through the port liner is significantly reduced.

That is, the exhaust gas flowing through the port liner does not come into direct contact with the joint of the inner wall member to the rotor housing body, thereby avoiding heat transfer to the rotor housing body through this joint, and the exhaust gas The heat loss of the gas is further reduced, while the cooling water passage for cooling the rotor housing main body may be provided along the outside of the annular groove in the usual manner, thereby being located at the end face of the rotor housing. The cooling effect on the O-ring is performed in the same manner as in a normal exhaust port structure, and the cooling effect of the cooling water is prevented from substantially acting on the solid wall portion of the exhaust port.

Further, the port liner is supported by the rotor housing body at a portion of the inner wall member that is not joined to the rotor housing body, and a contact portion with the rotor housing body is located away from the cooling water passage. Therefore, heat loss from the port liner is extremely small.

According to a more detailed feature of the present invention, the port liner may be formed of a thin port liner with a small heat capacity, and with such a thin port liner, the warm-up temperature of the port liner itself can be reduced, and the temperature of the exhaust port portion at the time of startup can be reduced. Heat loss can be reduced.

According to another more detailed feature of the present invention, the port liner is attached to the rotor housing main body by providing a flange portion in the portion thereof, fitting the flange portion into the annular groove, and attaching the port liner to the rotor housing body by fitting the flange portion into the annular groove. may be joined to the non-joining end face of the inner wall member and fixed to the rotor housing body with an appropriate fastener member; in such a case,
Exhaust gas leaking into the gap between the inner wall member and the port liner is sealed by both the non-joining end face of the inner wall member and the flange face, and the reactor mounting area also ensures a sufficient sealing area with the gasket. This reduces exhaust gas leakage to zero.

The attached FIG. 1 is a side view showing a part of the rotor housing of a low-rise engine equipped with the exhaust port structure according to the present invention, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. be.

In these figures, 1 is a rotor housing, and 2 is a trochoidal inner surface defined inside the rotor housing.

The rotor housing 1 is provided with an exhaust port 3 at a position slightly apart from the end shaft position of its trochoidal shape.

The exhaust port 3 opens at one end, that is, the inner end, into the trochoidal inner circumferential surface, and at the other outer end, a manifold reactor is attached to a part of the outer surface of the rotor housing. It opens at seat 4.

An inner O-ring groove 5 and an outer O-ring groove 5fJ3 are formed along the inner and outer circumferences of the end face of the rotor housing 1, and these grooves allow assembly of the rotor housing 1 and side housing (not shown). At this time, an inner O-ring and an outer O-ring are respectively attached.

Further, a cooling water jacket 7 is provided in a region between the inner O-ring groove and the outer O-ring groove, passing through the rotor housing 1 in the axial direction.

In the case of the exhaust port 3, the cooling water jacket extends shallowly along the surface of both ends of the rotor housing, and cooperates with the penetrating cooling water jackets disposed on both sides to close the outer periphery of the exhaust port. It constitutes a jacket that wraps around the body.

An annular groove 8 extending in the axial direction of the exhaust port and surrounding it is formed in the exhaust port peripheral wall portion remaining between the exhaust port 3 and the cooling water jacket surrounding the outer periphery thereof.

The annular groove 8 is formed in such a shape that the groove width gradually decreases from the outer surface of the seat 4 to the vicinity of the inner peripheral surface of the rotor housing. As a result, an exhaust port inner wall member 9 in the form of a cantilevered sleeve is formed on the same edge of the exhaust port 3 and is supported by being joined to the rotor housing at the inner end side.

A port liner 10 is disposed on the inner periphery of the inner wall member 9 of the exhaust port, and the port liner 10 extends over the entire length of the exhaust port in the axial direction and is substantially spaced from the inner periphery of the inner wall member 9 with a required gap. a thin-walled sleeve portion 10a isolated from the inner wall member; and a flange portion 10 at the outer end of the sleeve portion that is fitted into the outer opening of the annular groove 8 and joined to the non-joining end surface of the inner wall member.
b, and this flange portion 10b is fixed to the rotor housing 1 with a fixing pin 11.

In the figure, reference numeral 12 denotes holes through which bolts are passed for fastening the side housings to both ends of the rotor housing and taking over the engine casing.

As is clear from the illustrated configuration, the exhaust port 3 has a solid wall substantially defined by the inner circumferential wall of the port liner 10, and an air layer provided by the annular groove 8 from the rotor housing main body and the port liner and the inner wall member. They are adiabatically separated by an air space provided by a gap between them.

The casing cooling water flows in the cooling water jacket 7 surrounding the exhaust port, and performs the necessary cooling of the rotor housing at the solid edge of the exhaust port, but the port liner 10 may not be excessively cooled by this flow of cooling water. Maintained at high temperatures without being required.

This keeps the exhaust gas flowing through the port liner at as high a temperature as possible without suffering significant heat losses.

From the above, according to the present invention, the exhaust port 1
It will be appreciated that an exhaust port structure is obtained that achieves the necessary insulation of the fl wall.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a part of a rotor housing incorporating an exhaust port structure according to the present invention, and FIG. 2 is a sectional view taken along line 1--2 in FIG. DESCRIPTION OF SYMBOLS 1... Rotor housing, 2... Trochoidal inner peripheral surface, 3... Mouth port, 4...
...Manifold reactor installation is done by seat, 5...Inner O-ring groove, 6...Outer 01J groove, 7. ,,...Cooling water jacket, 8...
Annular groove, 9... Inner wall member of exhaust port. 10: Port liner 11: Fixed pin, 12: Through bolt hole.

Claims (1)

[Claims] 1. A polygonal rotor is eccentrically located within a casing composed of a rotor housing having a trochoidal inner circumferential surface and a side housing that closes both ends of the rotor housing, with its top end in contact with the inner circumferential surface of the rotor housing. In the structure of the exhaust port opening in the rotor housing of a rolling type rotary engine, the peripheral wall of the exhaust port is separated from the rotor housing main body by an annular groove substantially surrounding the peripheral wall of the exhaust port, and has a trochoidal inner periphery. A cantilevered sleeve-shaped inner wall member is connected to and supported by the rotor housing main body at an inner end portion on the side closer to the surface, and at least the rotor of the inner wall member is formed on the inner peripheral portion of the inner wall member. The rotor housing is characterized by comprising a port liner that is substantially separated by a gap from the inner circumferential surface at a joint portion to the housing body portion and supported by the rotor housing body portion at a non-joint portion of the inner wall member. Exhaust port structure.