JPH0322487Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lubricating device for a rotary piston engine.

[Prior art] Japanese Patent Application Laid-Open No. 59-32602 discloses a first lubricating oil supply device that directly supplies lubricating oil into the working chamber and a lubricating oil supplying device that supplies lubricating oil into the intake passage as a lubricating device for a rotary piston engine. A second lubricating oil supply device is disclosed. In this type of lubricating device, the lubricating oil supplied by the first lubricating oil supply device is transmitted through the inner circumferential surface of the trochoid, thereby providing lubrication between the apex seal of the rotor and the inner circumferential surface of the trochoid. On the other hand, the lubricating oil supplied by the second lubricating oil supply device is supplied from the side intake port communicating with the intake passage to other sliding parts such as between the rotor side surface and the inner surface of the side housing. , the roles are shared by providing lubrication.

This division of roles has reduced the burden on individual lubricating oil supply devices and made it possible to distribute the appropriate amount; however, due to the negative pressure generated within the engine acting on each lubricating oil supply port, metering There was a problem that the pump discharge amount was greatly affected and the supply amount became unstable.

[Purpose of the invention] The purpose of the invention is to appropriately configure a first lubricating oil supply device that supplies lubricating oil directly into the working chamber and a second lubricating oil supply device that supplies lubricating oil to the intake passage. By doing so, it is an object of the present invention to provide a lubricating device for a rotary piston engine that can supply lubricating oil according to the characteristics of each oil supply position.

[Configuration of the invention] Therefore, the present invention provides a rotary piston having a first lubricating oil supply device that directly supplies lubricating oil into the working chamber and a second lubricating oil supplying device that supplies lubricating oil into the intake passage. In the engine, a negative pressure cancel check valve is used in the first lubricating oil supply device so that the negative pressure applied in the opening direction of the valve spool and the negative pressure applied in the closing direction of the valve spool are equalized; The lubricating oil supply device of No. 2 supplies auxiliary air into the intake passage according to the intake negative pressure,
The air bleed system is used to optimize the amount of lubricant supplied, and the lubricant supply passage to the second lubricant supply device is connected to the back side of the valve spool of the first lubricant supply device. This structure is characterized by the fact that it communicates with

[Effect of the invention] According to the invention, part of the oil metered by the metering oil pump is supplied to the negative pressure cancel type check valve, and the remaining oil is supplied to the negative pressure cancel type check valve. Since it is supplied to the air bleed type intake passage lubricating oil supply device to prevent air from getting mixed in, unmetered lubricating oil is not consumed, and the oil passage for preventing air mixing and the second lubricating oil supply Since it can also be used as a passage, the lubricating oil supply piping system can be simplified.

[Example] Hereinafter, embodiments of the present invention will be described in detail.

As shown in FIG. 1, a rotary piston engine, as is well known, includes a rotor housing 1 having a trochoidal inner circumferential surface 1a, and side housings 2 disposed on both sides of the rotor housing 1 (only one side is shown). The inside of the casing 3 consisting of
A substantially triangular rotor 4 rotates planetarily around an eccentric shaft 5 with each vertex in sliding contact with the trochoid inner circumferential surface 1a, causing suction from an intake port 6, compression, ignition by spark plugs 7 and 8, explosion, Expansion and exhaust from the exhaust port 9 are repeated continuously.

As a lubricating device for a rotary piston engine having the above-mentioned basic configuration, the working chamber 1 is defined by the inner surface of the casing 3 and the flank surface of the rotor 4.
A nozzle 11 consisting of a negative pressure cancel check valve as a first lubricating oil supply device for directly supplying lubricating oil to the rotor housing 1 is installed in the rotor housing 1, and an intake passage 12 communicating with the intake port 6 A nozzle 13 consisting of an air bleed check valve is installed as a second lubricating oil supply device for supplying lubricating oil.

The working chamber oil supply nozzle 11 supplies lubricating oil supplied from the metering oil pump 14 through the first oil supply pipe 15 into the working chamber 10, and mainly:
Lubrication is achieved between the trochoid inner circumferential surface 1a and the rotor 4 which rotates planetarily while apex seals 16 at each apex are brought into sliding contact therewith.

Further, the intake passage oil supply nozzle 13 supplies lubricating oil supplied from the metering pump 14 through the second oil supply pipe 17 together with auxiliary air. 2nd above
As will be described in detail later, the oil supply pipe 17 has its midway connected to the back of the valve spool of the working chamber oil supply nozzle 11.

The intake passage refueling nozzle 13 is connected to an air bleed passage 19 that opens upstream of the throttle valve 18 provided in the intake passage 12, and is connected to the intake negative pressure downstream of the throttle valve 18 that acts on the nozzle opening. By supplying a corresponding amount of auxiliary air together with lubricating oil, the amount of oil supplied is optimized and the amount of filling with auxiliary air is improved.

The structure itself of the air bleed type nozzle 13 is well known, so further explanation will be omitted.

Next, an example of a negative pressure cancel type check valve constituting the working chamber oil supply nozzle 11 will be explained with reference to FIG.

As shown in FIG. 2, this negative pressure cancel type check valve includes a cylindrical valve housing main body 20 and a nozzle main body 2 that is fitted and fixed to the lower end side of the main body 20.
1 and a valve sleeve 24 that supports the valve body 22 by a coil spring 23 are the basic components, and the threaded part provided on the lower end side of the valve housing main body 20 is the threaded part of the mounting hole 25 previously provided in the rotor housing 1. It is attached by screwing into the

With the valve housing main body 20 fixed, the first oil supply pipe 1 is connected to the first oil supply pipe 1 through the upper and lower gaskets and through the ring-shaped connecting fitting 26 that is tightened between the outer surface of the rotor housing and the tightening portion 20a of the main body 20.
The lubricating oil supplied by 5 is directly supplied to the working chamber 10 by the following route. In other words, the check valve includes an outer circumferential groove 27 provided on the outer periphery of the intermediate portion of the valve housing body 20, and an inflow port that communicates with the outer circumferential groove 27 and is formed by bending the upper end of the nozzle body 21 upward at a right angle. 28, inflow port 28
The oil chamber 2 is opened and closed by the valve body 22.
9 and an outflow passage 32 that communicates with the side of this oil chamber 29 via a small diameter passage 30, passes through the nozzle body 21 in the axial direction, and reaches a radial orifice 31 provided slightly above the lower end. It has an oil passage. Note that the radial orifice 31 is inserted into the mounting hole 2 through the gap between the nozzle body 21 and the mounting hole 25.
5 communicates with an outlet 25a provided at the lower end so as to open to the trochoid inner circumferential surface 1a. The structural feature of the above-mentioned check valve is that the oil chamber 29 in which the valve body 22 is housed is always communicated with the working chamber 10 side, so that negative pressure is generated on the working chamber 10 side. Even if the force acts on the oil chamber 29, the valve body 22 is constructed so as not to receive any force in either the valve-opening direction or the valve-closing direction. In other words, consideration is given so that even if the negative pressure generated within the working chamber 10 changes, the amount of oil supplied does not change.

The bolt 33 that biases and holds the coil spring 23 provided to the valve spool 24 has an oil supply passage communication hole 34 penetrating in the diametrical direction and a shaft portion of the bolt 34 extending from the middle of the communication hole 34 toward the lower end. A lubricating oil introduction hole 35 is provided therethrough. The oil supply passage communication hole 35 is a second oil supply pipe 1 that supplies lubricating oil to the intake passage oil supply nozzle 13.
7, and the lubricating oil introduction hole 35 introduces lubricating oil into the sliding part on the back of the valve spool 24.
This prevents external air from entering the lubricating oil, which would otherwise occur.

With the above configuration, the lubricating oil from the metering pump 14 can be supplied from the first nozzle 11 to the inner circumference of the trochoid without being affected by the negative pressure generated on the working chamber 10 side and without mixing external air. It is supplied into the working chamber 10 including the surface 1a. On the other hand, the lubricating oil supplied to the second nozzle 13 via the second oil supply pipe 17 is supplied to the intake passage 12 together with auxiliary air according to the intake negative pressure downstream of the throttle valve 18. The supplied lubricating oil is supplied between the inner wall surface of the side housing 2 and the side surface of the rotor 4 from the intake port 6 communicating with the intake passage 12, and contributes to lubrication of the rotor side surface.

In addition, in this proposal, the oil supply path that supplies the second lubricating oil supply device is communicated with the back of the valve spool of the first lubricating oil supply device, so there is no need to provide a special oil path to prevent air from entering. Furthermore, since only the lubricating oil metered by the metering oil pump is consumed, the supply amount can also be optimized.

[Brief explanation of the drawing]

FIG. 1 is an explanatory sectional view of a main part of a rotary piston engine showing an embodiment of the present invention, and FIG. 2 is a sectional view of a negative pressure cancel type nozzle. DESCRIPTION OF SYMBOLS 10... Working chamber, 11... Negative pressure cancel type check valve, 12... Intake passage, 13... Air bleed type check valve, 14... Metering oil pump, 15... First
Oil supply pipe, 17...Second oil supply pipe.

Claims (1)

[Claims for Utility Model Registration] A rotary piston engine having a first lubricating oil supply device that directly supplies lubricating oil into the working chamber and a second lubricating oil supply device that supplies lubricating oil into the intake passage, A negative pressure cancel check valve is used in the first lubricating oil supply device so that the negative pressure applied in the opening direction and the negative pressure applied in the closing direction of the valve spool are equalized, and the second lubricating oil supply device The device supplies auxiliary air into the intake passage according to the intake negative pressure,
The air bleed system is used to optimize the amount of lubricant supplied, and the lubricant supply passage to the second lubricant supply device is connected to the back side of the valve spool of the first lubricant supply device. A lubricating device for a rotary piston engine, characterized by communicating with the rotary piston engine.