JPS585432A - Intake device of rotary piston engine with supercharger - Google Patents

Abstract

PURPOSE:To prevent a mixture from intruding into an oil pan, by opening both ports for the mixture and air to a side housing and forming an air curtain between the port for the mixture and oil seal of a rotor. CONSTITUTION:A mixture is fed from a mixture port 4, opened to a working chamber, while air is supplied from an air port 5 via a passage 51. A rotor 3 is rotated, if the ports 4, 5 are cosed, the mixture and the air are fed between a side seal 31 and outer oil seal 32, however, the port 5 is located between the port 4 and the oil seal 32, and only the air is blown by a supercharger 7 from here, then the air is acted as an air curtain to prevent the mixture from flowing through the oil seals 32, 33, thus only the air flows passing. Accordingly, lubricating oil in an oil pan can be reduced with intruded fuel, prevented its deterioration and extended its replacement period.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an intake system for a supercharged rotary piston engine.

In a rotary piston engine, the rotor that rotates inside the housing has side seals and oil seals on both sides of the rotor, and these always contact the side housing to seal the inside of the working chamber. In a rotary piston engine installed in a passageway (for example, Japanese Patent Publication No. 47-37721), when the rotor closes the mixture port, the mixture from the mixture port pressurized by the supercharger flows between the oil seal and the side. It has the disadvantage that it passes between the housing and enters the oil pan, degrading the lubricating oil and increasing blow-by gas.

This invention has been made to solve these conventional drawbacks, and the air-fuel mixture passes through the oil seal by supplying air that does not contain fuel between the air-fuel mixture port and the oil seal. It is designed to prevent this.

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 designates a rotor housing having a polycylindrical inner circumferential surface, and 2 designates side housings disposed on both sides of the rotor housing. Inside the rotor housing, a polygonal rotor 6 is supported on an eccentric shaft for planetary motion. It is located. A side seal 31 is provided on the side surface of the rotor 3 near the outer periphery, and an outer oil seal 62 and an inner oil seal 33 are provided inside the side seal 31. 34 is an apex seal that seals between the corner of the rotor 3 and the rotor housing.

A mixture port (mixture intake port) 4 is formed in the side housing 2, and this mixture port is connected to an intake passage 6.
It communicates with a supercharger 7, an air flow meter 8, and an air cleaner 9 via. A throttle valve 42 and an injector 41 are arranged in the intake passage 6. The mixture boat 4 has a sliding trajectory 30 of the outer oil seal 32.
A slit-shaped air boat (air suction boat) 5 opens between the sliding trajectory 30 and the air-fuel mixture port 4, and this air port 5 is located on the outside of the air-fuel mixture boat 4. It has a width approximately equal to the width in the 30 directions. The air boat 5 communicates with an intake passage between the supercharger 7 and the injector 41 via an air passage 51, and the air passage 51 is provided with a check valve 52.

In the above configuration, the air-fuel mixture is supplied from the air-fuel mixture boat 4 which opens into the working chamber in the state shown in FIG. 1, and air is supplied from the air boat 5 through the air passage 51. As shown in FIG. 2, as the rotor 3 rotates and closes the mixture boat 4 and the air boat 5, the mixture and air are supplied between the side seal 31 and the outer oil seal 32. However, an air boat 5 is located between the air-fuel mixture port 4 and the oil seal 32, and air that does not contain fuel is blown from there by the supercharger 7, which acts as an air curtain and mixes the air. Prevents air from passing through the oil seals 32 and 33,
Only air passes through the oil seals 52 and 55. This reduces the amount of fuel such as gasoline entering the lubricating oil in the engine's oil pan (not shown), prevents its deterioration, improves the durability of the lubricating oil, and reduces the generation of blow-by gas. It is also possible to reduce the capacity of the canister that performs the processing.

As explained above, the present invention opens an air boat along with a mixture port in the side housing of a rotary engine, forms an air curtain between the mixture boat and the oil seal of the rotor, and thereby allows the mixture to flow into the oil. This prevents the lubricating oil from entering the pan, thereby preventing the lubricating oil from deteriorating, increasing its durability, and extending the period between lubricating oil replacements.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional schematic diagram showing an embodiment of the present invention, and FIG.
The figure is a sectional view taken along line nn of Figure 1 when the rotor is at the position of the imaginary line in Figure 1. 1... Rotor housing, 2... Side housing, 6... Rotor, 4... Mixture boat, 5...
Air boat, 6... Intake passage, 7... Supercharger, 3
1...Side seal, 32...Outer oil seal, 33...Inner oil seal, 51...Air passage. Patent applicant: Toyo Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A rotor housing having a multi-arc inner peripheral surface;
In a rotary piston engine in which a polygonal rotor is supported on an eccentric shaft and rotates planetarily within a casing consisting of side housings disposed on both sides of the housing, an air-fuel mixture intake is connected to an intake passage. A port is opened in the side housing, a slit-shaped air intake boat is opened in the side housing between the port and the rotor's oil seal sliding locus, and a supercharger is provided in the intake passage. and an air-fuel mixture intake port, and an air passage that connects the air intake boat to an intake passage between the fuel supply means and the supercharger. Intake system for rotary piston engine.