JPS62170702A - Lubricating oil feeding device for rotary piston engine - Google Patents

Abstract

PURPOSE:To prevent delay in feeding of lubricating oil at the time of restarting of an engine by detecting an engine stoppage period from the stoppage of an engine to its restarting and increasing the supplying quantity of lubricating oil by the specified time when this detected period is more than the set period. CONSTITUTION:By the drive of a metaling oil pump 17, oil is fed from the first nozzle, through the first tube 15, into a suction passage 11, while oil is fed from the second nozzle 13, through the second tube 16, into an operating room 6. At this time a control lever 20 is provided in a pump 17 and a stepping motor 22 which is controlled by a microcomputer 21 is connected to the lever 20. Further an engine stoppage period detecting circuit 23 is provided in the microcomputer 21 and the detected period A is compared with the set period B from an engine stoppage period setting circuit 25 in a comparing circuit 24. And when the detected period A is longer, for example, than the set period B, the motor 22 is controlled by means of an oil feeding quantity increasing circuit 26.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a lubricating oil supply device for a rotary piston engine.

(Prior art) Generally, in a rotary piston engine, a roughly triangular rotor moves planetarily through a casing formed by a rotor housing having a trochoidal inner circumferential surface and a side housing to perform suction, compression, and explosion. , which performs the exhaust stroke.

An apex seal is provided at the apex of the rotor to maintain airtightness of the working chamber formed by the trochoidal surface of the housing and the flank surface of the rotor.

The apex seal is in sliding contact with the inner circumferential surface of the trochoid as the rotor rotates, and to make the apex seal's sliding contact smooth, lubricant is supplied according to the increase in engine vibration. A rotary piston engine has been proposed in which the amount of lubricating oil supplied from the device to the working chamber can be increased (see Japanese Patent Laid-Open No. 56-6003).

By the way, there was a problem in that the apex seal vibrated when the engine was started, causing a loud seal noise.

One of the causes of this nozzle noise is that the pump of the lubricating oil supply system that supplies lubricating oil to the working chamber is installed in a low place, and the supply nozzle on the working chamber side is installed in a high place, so the engine stops. This is because sometimes the lubricating oil in the lubricating oil supply passage goes down to the pump side, so-called oil drop, and the lubricating oil is not immediately supplied to the working chamber at the time of startup.

Furthermore, if the engine is operated at high load and high rotation speed without lubricating oil being supplied at the time of starting, there is a problem that the combination engine runs down, resulting in poor starting and the like.

(Object of the Invention) The present invention has been made in order to solve the above-mentioned problems of the conventional technology, so that it is possible to avoid the delay in the supply of lubricant M when starting the engine, and to prevent the generation of seal noise at the time of starting, combresonion down, etc. The purpose is to prevent this from happening.

(Structure of the Invention) Therefore, the present invention provides a lubricating oil supply amount adjusting means for adjusting the lubricating oil supply amount from a lubricating oil supply device that supplies lubricating oil to the working chamber of a rotary piston engine, and an engine stop period detection means for detecting a period of , a comparison means for comparing the detection period with a stop period, and receiving an output from the comparison means, and controlling the lubricant supply amount for a predetermined period when the detection period is longer than the stop period. It is characterized by being provided with means for increasing the amount of lubricating oil supplied.

(Effects of the Invention) According to the present invention, the engine stop period from engine stop to engine restart is detected by the detection means, and when this detection period is longer than a set period, the lubricant supply amount is increased for a predetermined time by the increasing means. Therefore, even if oil drips while the engine is stopped, a large amount of lubricating oil is immediately supplied to the working chamber when the engine is restarted, which eliminates sealing noise at the apex knob. can be prevented. Second, since compression down does not occur, starting problems and the like will not occur.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, a rotor housing 1 has a trochoid inner circumferential surface 1a, and this rotor housing 1 forms a casing 3 together with side housings 2 provided on both sides thereof.

Inside the casing 3, a triangular rotor 4 is installed so as to rotate planetarily within the casing 3 while being supported by an eccentric shaft 7, and an apex knob 5 is attached to each vertex of the rotor 4 with a spring ( (not shown).

This apex seal 5 slides on the trochoid inner circumferential surface 1a when the rotor 4 makes a planetary rotation movement within the casing 3, and forms a working chamber 6 surrounded by the trochoid inner circumferential surface 1a and the flank surface 4a of the rotor 4. This is to maintain airtightness.

Note that 8 is an intake port, 9 is an exhaust port, and 10° IO is a spark plug.

An intake passage 11 connected to the intake port 8 is provided with a first oil supply nozzle 12 for supplying lubricating oil (hereinafter referred to as oil) into the intake passage 11. The second supplying oil into the chamber 6
An oil supply nozzle 13 is also provided.

1st. The second oil supply nozzle 12.13 is connected to the first and second oil supply nozzles.
Each is connected to a metering oil pump 17 via an oil supply tube 15,16.

Then, as the metering oil pump 17 is driven, oil is supplied from the first oil supply nozzle 12 through the first oil supply tube 15 into the intake passage 11 (boat oil supply), and through the second oil supply duplex 16. Oil is supplied from the second oil supply nozzle 13 to the working chamber 6 (direct oil supply).

The metal link oil pump 17 is provided with a control lever 20 for controlling the amount of oil supplied depending on the operating condition of the engine.

The control lever 20 is connected to a stepping motor [oil (lubricating oil) supply amount adjusting means] 22 which is driven and controlled by an on-vehicle microcomputer 21, and the control lever 20 is fully opened (oil supply) when the stepping motor 22 is driven. maximum) position.

The microcomputer 2I is provided with an engine stop period detection circuit 23 for detecting the period from engine stop to restart.

The detection circuit 23 includes a counter that detects ignition (IG) off time, a sensor that detects a decrease in cooling water temperature, and the like.

The detection period A detected by the detection circuit 23 is
4 is compared with the setting 1g1 period B from the engine stop period setting circuit 25.

In the case of the ignition off time, the set period B is the time from ignition off to on, or for example, 6
For example, if it is set to 0 minutes and the cooling water temperature is 60 minutes.
Set to °C.

When the output from the comparison circuit 24 is greater than the detection period A>set period B, it is determined that oil is decreasing, and the oil (lubricating oil) supply amount increasing circuit 26 controls the driving of the stepping motor 22. Then, the oil supply amount is increased by a predetermined time C. On the other hand, when the detection period A is less than the set period B, it is determined that the oil is not decreasing and the stepping motor 22 is controlled not to be driven.

With the above configuration, when the engine is operating, oil is supplied from the second oil supply tip 16 to the working chamber 6 through the second oil supply nozzle 13 by driving the metal link oil pump 17, and the oil supply amount is increased. is controlled by a control lever 20 depending on the operating state of the engine.

Next, when the engine is stopped, if the engine stop period detection circuit 23 or a counter that detects the ignition off time is used, step Sl.
When the ignition is turned off (engine stopped) at step S2, counting starts, and at step S2 the ignition is turned on (engine stopped).
When the engine is restarted), the count is stopped, and in step S3, the comparator circuit 24 calculates the ignition off time (
The detection period A) and the set time (set period B) are compared.

If the off time is shorter (60 minutes or less) than the set time (60 minutes), it is determined that oil is not dropping, and in step S4 the stepping motor 22 is controlled to be non-driving, that is, the control lever 20 is Does not control opening.

On the other hand, the off time is longer than the set time (60 minutes).
If so (for 60 minutes or more), it is determined that oil is decreasing, and in step S5, the oil (lubricating oil) supply amount increasing circuit 2 is activated.
6, the controller 8 = the full opening time of the lever 20 is determined based on the map (graph) of FIG. In step S7, the stepping motor 22 is driven and controlled for the time set by the timer, and the control lever 2
0 is operated to the fully open position (maximum oil supply amount).

As a result, even if the oil is drained while the engine is stopped, the metering oil pump 17
Since a large amount of lubricating oil is immediately supplied to the working chamber 6, delays in oil supply can be prevented, and sealing noise and starting failures can be prevented.

On the other hand, if the engine stop period detection circuit 23 is a sensor that detects the engine cooling water temperature, as shown in FIG. The circuit 24 compares the cooling water temperature (detection period A) and the set water temperature (set period B).

If the cooling water temperature is higher than the set water temperature (608C) (60°C or more), it is determined that oil is not flowing down, and in step S3, the stepping motor 22 is controlled to be non-driving, that is, the control lever 20 does not control the opening degree.

On the other hand, if the cooling water temperature is lower than the set water temperature (60°C) (60°C or less), it is determined that oil is leaking.
In step S4, the oil (lubricating oil) supply amount increasing means 26 determines the full opening time of the control lever 20 according to the cooling water temperature based on the map (graph) of FIG. 5, and sets it in a timer, and in step S5, the starter switch is When turned on, in step S6, the stepping motor 22 is driven and controlled for the time set by the timer, and the control lever 20 is operated to the fully open position (the amount of oil supplied is maximum).

Thereby, the same operation and effect as when the engine stop period detection circuit 23 is a counter that detects the ignition off time can be achieved.

[Brief explanation of drawings]

FIG. 1 shows a 26... equipped with a lubricating oil supply device according to the present invention.
Oil (lubricating oil) supply amount increase circuit. A front view of a rotary piston engine. Figure 2 is a flowchart for increasing the oil supply amount during the ignition off time. Figure 3 is a graph showing the relationship between the ignition off time and the control lever fully open time. Figure 4 is the cooling water temperature. FIG. 5 is a graph showing the relationship between the cooling water temperature and the control lever fully open time. ■...Rotor housing, 1a...Trochoid inner circumferential surface, 4...Rotor, 5.Apex seal, 6...Working chamber, 13.Second oil supply nozzle, 16...Second oil supply tube, 17 ... Metering oil pump, 20. Control lever, 21. Microcomputer, 22. Stepping motor (lubricating oil supply amount adjustment means), 24 Comparison circuit, 25. Engine stop period setting circuit,

Claims (2)

[Claims] (1) A rotary piston engine in which a polygonal rotor makes a planetary rotation movement inside a casing having an inner circumferential surface of a trochoid while an apex seal attached to the apex is in sliding contact with the inner circumferential surface of the trochoid. A lubricating oil supply device that supplies lubricating oil to the working chamber is provided, and a lubricating oil supply amount adjusting means that adjusts the amount of lubricating oil supplied from the lubricating oil supply device, and detecting a period from engine stop to restart. an engine stop period detection means; a comparison means for comparing the detection period with a set period; and a lubricant supply that receives an output from the comparison means and increases the lubricant supply amount for a predetermined period when the detection period is equal to or longer than the set period. A lubricating oil supply device for a rotary piston engine, characterized in that a lubricating oil supply device is provided with a quantity increasing means. (2) The lubricating oil for a rotary piston engine according to claim (1), wherein the predetermined time is determined depending on the engine stop time or the engine cooling water temperature. Feeding device.