JPS6394032A - Lubrication oil supply device for rotary piston engine - Google Patents

Abstract

PURPOSE:To reduce the consumption rate of oil while the fuel consumption of the engine is reduced, by forming a supply port for supplying metered oil into an operating chamber of the engine so that the supply port is opened to an intake air passage upstream of a root blower type supercharger. CONSTITUTION:A root blower type supercharger 4 is disposed in the intermediate section of an intake-air passage 3. A supercharger supply port 5 for supplying metered oil into an operating chamber 2a of an engine 2 is opened to the intake-air passage 3 upstream of a supercharger 4. With this arrangement, it is possible to supply oil under a relatively low pressure so that the drive torque of the oil pump is reduced. Thus, it is possible to enhance the economy of fuel consumption to aim at miniaturizing the pump.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is utilized in the technical field of automobile prime movers, and in particular, the d'JJ lubricant supply device θ of a rotary piston engine.
Regarding.

(Prior Art) As one of the lubricating oil supply devices for a rotary piston engine, a first lubricating oil supply passage opens into the intake passage to supply lubricating oil from a metering oil pump, and a second lubricating oil supply passage opens into the working chamber of the engine. It is known that lubricating oil is supplied to the working chamber via at least one of the lubricating oil supply passages (
For example, see Japanese Utility Model Application Publication No. 60-3201), the engine is configured to stop direct oil supply into the working chamber in a specific operating range of the engine.

(The key points that the invention seeks to solve) However, rotary engines equipped with roots blower type superchargers have come to be used to improve the responsiveness of engines during acceleration, and There are still unresolved questions regarding effective lubrication of the supercharger.

In view of the conventional problems mentioned above, the present invention lubricates not only the engine body of a rotary engine but also the Roots blower type supercharger, thereby improving the discharge function of the supercharger and reducing the driving torque of the oil pump. In addition, it is an object of the present invention to provide a lubricating oil supply device for a rotary piston engine in which the control accuracy of oil supply jIt is improved.

(R-stage for solving the problem) Means for solving the above-mentioned problems of the present invention is a device for supplying lubricating oil to a rotary piston engine equipped with a Roots blower type supercharger in the intake passage. , the supply port for supplying metering oil into the working chamber of the rotary piston engine is opened to the intake passage on the upstream side of the Roots blower type supercharger.

(Function) The effect of the above means is that lubricating oil is supplied at a relatively low pressure from the turbocharger supply port provided in the intake passage on the upstream side of the Roots blower type supercharger to the sealing area of the working chamber of the supercharger. This lubricating oil is also supplied to the working chamber of the rotary piston engine by the supercharged intake air.

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

FIG. 1 shows a lubricating oil supply bag g11 of a rotary piston engine (hereinafter simply referred to as engine) 2, which is equipped with a Roots blower type supercharger (hereinafter simply referred to as supercharger) 4 in the middle of an intake passage 3. In the working chamber 2a of the engine 2,
A supercharger supply port 5 for supplying metering oil,
It opens into the intake passage 3 on the upstream side of the supercharger 4.

The rotary piston engine 2 has an engine casing 6
The two supercharger rotors 8 and 9 of the supercharger 4 are rotated in opposite directions via the transmission means 10, the intermediate shaft 11 and the electromagnetic clutch 12 by the output shaft 7a of the engine rotor which rotates in the direction of the arrow within the engine. Rotationally driven. Further, the engine side housing 13 of the engine casing 6 has an intake boat 13a, and the engine side housing 14 has an intake boat 14a equipped with a fuel injector 15.
It is equipped with an engine oil filler port 16 provided near the intake boat, two spark plugs 17, 17, and an exhaust port 14b.

Inlet 18a of air filter 18 with air flow meter 18b and intake inlet 19a of supercharger casing 19
The upstream intake pipe 20 connects the discharge port 19b of the supercharger casing 19 and the intake boat 14a of the engine 2.
are connected by a downstream intake pipe 21, and the intake passage 3 is configured by connecting a bypass pipe 23 provided with a supercharger bypass valve 22 to the upstream intake pipe 20 and the downstream intake pipe 21,
A control unit 8 is linked to the supercharger bypass valve 22 .

Further, a throttle valve 24 is provided on the upstream side of the upstream intake pipe 20 where the bypass pipe 23 opens.

(1'8 Lubricating oil supply device 1 is the above-mentioned supercharger oil supply port 5)
It supplies metering oil to the engine oil filler port 16, and includes an oil tank 25, an oil pump 26 that sucks lubricating oil from the oil tank and supplies oil to each oil filler port 5.16, and oil feed pipes 27.28. It is composed of
The oil pump 26 is connected to the engine 2 by a known transmission means, and the oil supply pipe 27 is provided with a supercharger oil supply valve 29 .

The control unit A receives intake flow rate data B from the air flow meter 18b and rotation speed data C from the output shaft 7a of the engine 2, and sends a bypass opening/closing signal to the turbocharger bypass valve 22 and a turbocharger oil supply valve 29. Open/close No. 18 E to the electromagnetic clutch 12, engage/disengage signal l? and a fuel injection signal G to the fuel injector 15, respectively.

Next, the operation of this embodiment will be explained.

As shown in FIGS. 1 and 2, the electromagnetic clutch 12 is disengaged and the supercharger bypass valve 22 and supercharger oil supply valve 29 are disengaged.
When the engine 2 is started with the valve open, the control unit 8 receives the engine rotation speed data C and the intake flow rate data 13 from the air flow meter 18b, and outputs the optimum combustion injection signal G according to the operating condition. Output to the fuel injector 15.

When the automobile is running on a flat road, as the engine 2 increases its rotational speed, the load increases along the running resistance line R, and when it reaches the electromagnetic clutch engagement/disengagement boundary line N, the control unit A
The electromagnetic clutch 12 receives the mating command of the mating/disengaging signal F from
are fitted, and the supercharger 4 is driven to rotate. Furthermore, when the load increases due to the increase in engine speed and reaches the bypass valve opening/closing boundary ML, the bypass valve 22 is closed by the opening/closing signal E from the control unit 8.
is closed and enters the supercharging area S, and the engine 2 is supercharged with intake air from the supercharger 4.
The metering oil is pumped to perform only direct oil supply, and the metering oil mainly spreads on the inner circumferential wall surface of the engine rotor housing 14 and lubricates the sliding surface between the apex seal and the engine rotor housing 14. Furthermore, as the engine speed increases along the running resistance line R and the load increases, the supercharger supercharging region P on the high speed side of the supercharging region S is reached, and the supercharger refueling valve 29 is controlled. It is opened in response to the opening command of the opening/closing signal F from the unit A, and metering oil is supplied from the oil pump 2G to the supercharger oil supply port 5. The metering oil is atomized by the flow of intake air in the upstream intake pipe 20, flows into the working chamber 4a of the supercharger 4, and flows between the supercharger rotors 8 and 9 and between the rotor and the supercharger casing. 19, and also lubricates the seal part between the turbocharger 4 and the downstream intake pipe 2 in atomized state.
1 and flows into the working chamber 2a of the engine 2 to enhance the engine refueling action.

(Effect of 5a Akira) According to the configuration of ``2'' in the present invention, the supercharger supply port is provided in the intake passage on the upstream side of the Roots blower type supercharger, so it is possible to supply oil at a relatively low pressure. Therefore, the driving torque of the oil pump is reduced, and the fuel efficiency of the engine is improved, and the pump can be made smaller. In addition, the metering oil supplied from the turbocharger supply port lubricates the turbocharger working chamber, while reducing the seal clearance to improve discharge performance and prevent seizure. not,
Improves lubrication performance by enhancing the engine's oil supply effect,
Furthermore, since pressure fluctuations are small on the suction side of the supercharger, the accuracy of the oil supply device is improved and oil consumption can be reduced, which is an excellent effect.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a diagram illustrating the main parts of a lubricating oil supply device for a rotary piston engine.
FIG. 2 is an explanatory diagram showing the operation control of the engine including the lubricating oil supply device. 1...Lubricating oil supply device, 2...Rotary piston engine, 2a...Working chamber, 3...
...Air supply passage, 4...Supercharger, 5...
Supercharger supply port, 20... Upstream intake pipe.

Claims (1)

[Claims] (1) A device for supplying lubricating oil to a rotary piston engine equipped with a Roots blower type supercharger in the intake passage,
A lubricating oil supply device for a rotary piston engine, characterized in that a supply port for supplying metering oil into the working chamber of the rotary piston engine is opened in an intake passage on the upstream side of a roots blower type supercharger.