JPH0221523Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a lubricating oil supply device for a rotary piston engine, and particularly to a lubricating oil supply device for a supercharged rotary piston engine.

(Prior art) Conventionally, rotary piston engines have been equipped with lubricating oil supply nozzles to lubricate between the apex seal and the trochoid inner circumferential surface of the rotor housing, and between the side seals, corner seals, and the rotor sliding surfaces of the side housing. It is known that the intake passage is attached to the rotor housing.
6003, JP-A-59-32602).

By the way, it has been proposed that air bleed air is supplied to the lubricating oil supply nozzle to mix the air and lubricating oil, and then the lubricating oil is supplied from the nozzle. In a lubricating oil supply system for a rotary piston engine with a rotary piston engine, when the air bleed air is taken out from the upstream side of the supercharger, the lubricating oil will not flow back due to the boost pressure and be supplied to the engine, so the air bleed air will not overflow. It is necessary to take it out from the downstream side of the feeder. However, if you simply take out the air bleed air from the downstream side of the turbocharger, the above problem will not occur because the heating of the air by the turbocharger will not progress much when the engine is idling or operating at low load, but when operating at high load, There is a problem in that the oil temperature rises considerably due to the rise in the temperature of the pressurized air, and the viscosity of the lubricating oil decreases, making it impossible to provide sufficient lubrication.

(Purpose of the invention) The present invention was made in view of the above-mentioned circumstances, and its object is to prevent an abnormal temperature rise of lubricating oil supplied to the working chamber or intake passage in a supercharged rotary piston engine.

(Configuration of the invention) The characteristics of the configuration of the invention are that air bleed air is taken out from the downstream side of the cooler installed downstream of the supercharger, and the air bleed air is attached to the rotor housing or intake passage. The lubricating oil is supplied to a nozzle for supplying lubricating oil.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In Fig. 1, 1 is an air cleaner, 2 is an air flow meter installed downstream of the air cleaner 1, and 3 is an air flow meter installed downstream of the air cleaner 1.
and 4 are a primary side intake passage and a secondary side intake passage provided downstream of the air flow meter 2, respectively,
Inside the primary intake passage 3 is a primary throttle valve 5 that is linked to the accelerator pedal, and further downstream of the throttle valve 5 is a primary lubricating oil supply nozzle 6.
A fuel injection valve 8 is attached to the intake manifold of the primary side intake passage 3 upstream of the intake port 7 opened in the side housing. In addition, 9 inputs the supplied air amount signal from the air flow meter 2, the engine speed and other engine operating state information, and calculates the amount of fuel to be supplied to the fuel injection valve 8 using a computer, and calculates the result. This is a control circuit that provides a valve opening time signal for the fuel injection valve 8.

On the other hand, the secondary intake passage 4 branched from the downstream side of the air flow meter 2 includes a supercharger 10, which is a vane type air pump, for example, a cooler 11, a timing valve 12 that rotates in synchronization with the rotation of the engine, and the primary side A secondary throttle valve 13, which starts opening after the throttle valve 5 opens to a set opening degree, is installed in that order, and the end of the intake passage 4 is opened into the side housing as an intake port 14 on the leading side of the intake port 7. ing. Although not shown, the supercharger 10 is operated by the engine in order to supply part of the air pressurized by the supercharger 10 into the exhaust gas as secondary air. It is configured to be driven over the entire operating range.

There is a lubricating oil supply nozzle 16 inserted and fixed into a hole 151 of the rotor housing 15 near both intake ports 7 and 14. 17 supplies lubricating oil from an oil pan and an oil filter (not shown) to an accelerator (not shown). The lubricating oil supply nozzle 6 is connected to the lubricating oil supply nozzle 6 through a pipe 19 while controlling the flow rate through a connecting member 18 connected to the pedal.
This is a metering pump that supplies lubricating oil to the lubricating oil supply nozzle 16 through a pipe 20.

21 is an air bleed air switching control valve, and this control valve 21 has two inlets 211 and 212 and one outlet 213. The inlet 211 is connected to the cooler 11 via a pipe (air passage for air bleed) 22.
and an air bleed air outlet A provided between the supercharger 10 and the downstream side of the relief valve 29 described later.
The inlet 212 is also connected to the air bleed air outlet provided in the secondary intake passage 4 between the cooler 11 and the timing valve 12 via a pipe (air bleed air passage) 23. In addition, the outlet 213 of the control valve 21 is connected to the lubricating oil supply nozzle 6 and 1 by a pipe (air bleed air passage) 24 that branches in the middle
It is configured to supply air bleed air to 6.

A thermosensor 25 detects the temperature of pressurized air in the secondary intake passage 4 pressurized by the supercharger 10, and this thermosensor 25 is connected to the electromagnetic coil 214 of the control valve 21 via a battery 26. The switch 27 controls the on/off operation of the switch 27.

28 is a bypass that communicates the upstream side and the downstream side of the supercharger 10, and a relief valve 29 is provided in the middle of this bypass 28, and when the pressure on the downstream side reaches a predetermined value, the relief valve 29 is closed. The pressure is returned to the upstream side to prevent the pressure from exceeding a certain value.

In addition, 100 is a rotor of a rotary piston engine, 110 is an apex seal attached to each vertex of the rotor 100, 120 is a corner seal, 1
30 is a side seal provided on the rotor; 14
0 represents the working chamber, respectively.

Further, 150 is a through hole for cooling water circulating inside the rotor housing 15.

Next, the operation of the embodiment of the present invention will be explained regarding the flow of air bleed air and lubricating oil.

When the engine is idling or operating at low load, the heating of the pressurized air by the supercharger is not progressing very much, so the thermosensor 25 is not activated, so the switch 27 is off, and the electromagnetic coil 214 is also turned off. Since the plunger 216 of the control valve 21 is inactive, the plunger 216 of the control valve 21 is
The inlet 212 is pushed to the right in the figure by the spring force of 15, and the inlet 211 and the outlet 213 communicate with each other (the state shown in the figure).

Therefore, a part of the pressurized air before passing through the cooler 11 is introduced into the pipe 22 from the air bleed air outlet A as air bleed air,
The lubricating oil is supplied to the lubricating oil supply nozzles 6 and 16 through the control valve 21 and the pipe 24.

An amount of lubricating oil corresponding to the amount of depression of the accelerator pedal at that time is supplied from the metering pump 17 to the lubricating oil supply nozzles 6 and 16, and together with the air bleed air, the inner circumferential surface of the intake passage 3 and the trochoid of the rotor housing. 160, respectively.

In this case, a portion of the pressurized air that is pressurized by the supercharger 10 and has a relatively high temperature is supplied to the lubricating oil supply nozzle as air bleed air, so that the lubricating oil is supplied to the air bleed air. It becomes a good viscosity and is supplied to the engine.

When the engine is operating under high load, the relationship is opposite to that of . That is, since the temperature of the pressurized air by the supercharger increases, the thermosensor 25 is activated, so the switch 27 is on, and the electromagnetic coil 214 is also activated, so the plunger 216 of the control valve 21 is activated. is spring 21
The inlet 211 is attracted toward the left in the figure against the spring force 5, and the inlet 211 is closed, and the inlet 212 and outlet 213 communicate with each other. A part of the pressurized air that has passed through the cooler and has been cooled is introduced into the pipe 23 from the air bleed air outlet B as air bleed air, and is supplied with lubricating oil from the outlet 213 of the control valve 21 through the pipe 24. is supplied to the nozzles 6 and 16 for use.

An amount of lubricating oil corresponding to the amount of depression of the accelerator pedal at that time is supplied from the metering pump 17 to the lubricating oil supply nozzles 6 and 16.

Furthermore, as the engine speed increases, the rotation speed of the supercharger 10 becomes higher. Therefore, the pressure downstream of the supercharger is higher than in the case of . The flow of lubricating oil and air bleed air is the same.

However, at that time, the plunger 291 of the relief valve 29 moves against the spring 292, the bypass 28 is opened, the high pressure air is returned to the upstream side of the supercharger, and the pressure on the downstream side is maintained at a predetermined value. At the same time, the engine can be operated safely.

In the above embodiment, the lubricating oil supply nozzle is provided in the primary intake passage 3 and the rotor housing 15, but the present invention is not limited to this. , the rotor housing 15 may be provided in only one side of the rotor housing 15, or a single intake passage may be provided with a supercharger, a cooler, and a throttle valve in this order from the upstream side, and lubrication may be provided downstream of the throttle valve. An oil supply nozzle may also be provided.

In addition, it is most preferable to take out the air bleed air supplied to the lubricating oil supply nozzle from the upstream or downstream side of the cooler using a switching control valve as in the above embodiment, but if necessary, it is possible to always The air bleed air may be taken out only from the downstream side. In this case, the viscosity of the lubricating oil at light loads is higher than in the above embodiment, and the lubricity is slightly reduced, but at high loads, abnormal temperature rises of the lubricating oil can be prevented as in the above embodiments. .

(Effects of the invention) Since the present invention is configured as described above, overheating of the air bleed air can be prevented during high load operation. Therefore, the temperature of the lubricating oil does not rise abnormally, and the viscosity of the lubricating oil does not decrease, which has the effect of ensuring sufficient lubrication for the rotary piston engine.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention. 3, 4...Intake passage, 10...Supercharger, 11...
... Cooler, 140 ... Working chamber, 6, 16 ... Nozzle for lubricating oil supply, 22, 23, 24 ... Air passage (pipe) for air bleed.

Claims (1)

[Scope of utility model registration request] A supercharger is provided in the intake passage, and a cooler is provided downstream of the supercharger to cool the pressurized air pressurized by the supercharger. In a rotary piston engine lubricating oil supply device configured to supply lubricating oil from a supply nozzle to a working chamber or an intake passage, an air bleed air passage communicating with the lubricating oil supply nozzle communicates with an intake passage downstream of the cooler. A lubricating oil supply device for a rotary piston engine, which is characterized by: