JPH0322488Y2 - - 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 mainly between the rotor side surface and the side housing inner surface. In this way, the roles are divided.

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.

As a solution to this problem, a system is known that uses an air bleed type lubricating oil supply device that supplies air when negative pressure is generated to reduce the negative pressure applied to the lubricating oil outlet. However, this system also had drawbacks. That is the first
In response to the request that the lubricating oil supplied from the lubricating oil supply device of A sufficient lubricating oil film cannot be formed, resulting in poor lubrication.

[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,
This structure is characterized by an air bleed system that optimizes the amount of lubricating oil supplied.

[Effect of the invention] According to the invention, the first lubricating oil supply device can directly supply lubricating oil without being affected by the negative pressure in the working chamber, so it is possible to supply lubricating oil directly to the space between the rotor and the rotor housing, which is particularly difficult. In addition, the second lubricating oil supply device can supply atomized lubricating oil to the intake passage by bleed air according to the intake negative pressure. The supply amount can be optimized.

[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, and performs suction from an intake port 6, compression, ignition,
It is designed to continuously repeat explosion, expansion, and exhaust.

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 refueling 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 the intake passage 1 communicates with the intake port 6.
Oil supply nozzle 1 consisting of an air bleed type check valve as a second lubricating oil supply device that supplies lubricating oil to
Install 3.

The working chamber oil supply nozzle 11 supplies lubricating oil supplied from the metering oil pump through the first oil supply passage 14 into the working chamber 10, and mainly applies to the trochoid inner circumferential surface 1a and the apex seals at each apex thereof. Rotor 4 rotates planetarily while making sliding contact
To ensure lubrication between

Further, the oil supply nozzle 13 of the intake passage 12 supplies lubricating oil supplied from the metering pump through the second oil supply passage 15 together with auxiliary air.

For the intake passage refueling nozzle 13, a throttle valve (not shown) interposed in the intake passage 12 is used.
The air bleed passage 16 opened on the upstream side is connected to the air bleed passage 16, and the amount of auxiliary air corresponding to the intake negative pressure downstream of the throttle valve acting on the nozzle port is supplied together with lubricating oil, thereby optimizing the amount of oil supply and auxiliary air. Efforts are being made to increase the amount of air filled.

The structure itself of the air bleed type refueling 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 refueling 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 passage 14 is connected to the first oil supply passage 14 via the upper and lower gaskets and the ring-shaped connecting fitting 26 tightened between the outer surface of the rotor housing and the tightening portion 20a of the main body 20. The lubricating oil supplied by is directly supplied to the working chamber 10 through 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. An oil chamber 29 that is opened and closed by the valve body 22 with respect to the passage 28 and the inflow port passage 28 is connected to the side of the oil chamber 29 via a small diameter passage 30, which passes through the nozzle body 21 in the axial direction. It has an oil passage consisting of an outflow passage 32 leading to a radial orifice 31 provided slightly above the lower end. The radial orifice 31 communicates through the gap between the nozzle body 21 and the attachment hole 25 with an outlet 25a provided at the lower end of the attachment hole 25 so as to open into 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 this negative pressure acts on the oil chamber 29, the valve body 22
The structure is such that it is not subjected to 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.

Further, the valve spool 24 is provided with a lubricating oil introduction hole 33 that penetrates in the axial direction. This lubricating oil introduction hole 33 is communicated with a lubricating oil passage 34, and lubricating oil is introduced into the sliding part on the back of the valve spool 24 to prevent external air from entering the lubricating oil, which would otherwise occur. do.

With the above configuration, the lubricating oil from the metering pump is supplied to the inner circumference of the trochoid from the first oil supply nozzle 11 without being affected by the negative pressure generated on the working chamber 10 side and without mixing outside air. It is supplied into the working chamber 10 including the surface 1a. On the other hand, the lubricating oil supplied to the second oil supply nozzle 13 via the second oil supply passage 15 is supplied to the intake passage 12 together with auxiliary air according to the intake negative pressure downstream of the throttle valve. 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.

[Brief explanation of the drawing]

FIG. 1 is an explanatory sectional view of the main parts 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 refueling nozzle. 10...Working chamber, 11...Negative pressure cancel type refueling nozzle, 12...Intake passage, 13...Air bleed type refueling nozzle.

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,
A lubricating device for a rotary piston engine, characterized by an air bleed system that optimizes the amount of lubricating oil supplied.