JPH04262010A - Lubricating device for vehicle engine - Google Patents

Abstract

PURPOSE:To reduce the supply quantity of the lubricating oil, particularly in the engine low revolution speed, by properly controlling the supply quantity of the lubricating oil supplied from an oil pump according to the engine revolution speed. CONSTITUTION:An oil pump 15 for separating oil supply which is driven by an engine 10 is equipped with a suction port 21 and a plurality of discharge ports 23A and 23B. The suction port of the oil pump is connected with an oil tank 14, and at least one of a plurality of discharge ports is connected with the engine and the oil tank through selector valves 16A and 16B. The selector valve is switching-controlled so that the lubricating oil discharged from the oil pump is supplied to the engine from the oil tank in the prescribed engine revolution speed or more.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubrication system for a vehicle engine that supplies lubricating oil to a two-stroke engine.

0003

2. Description of the Related Art Many two-stroke engines employ a separate oil supply system in which lubricating oil is supplied from an oil tank to the engine using an oil pump. In this case, since the oil pump is driven by the crankshaft, the amount of lubricating oil supplied by the oil pump increases in proportion to the increase in engine speed.

However, in such an oil pump,
There is a risk that an excessive amount of lubricating oil will be supplied in the low engine speed range, resulting in white smoke. Therefore, in the invention described in Japanese Utility Model Application Publication No. 60-4711, as shown in FIG. The solenoid valve 3 is closed and the lubricating oil discharged from the oil pump 1 is returned (relieved) to the oil tank 5 as shown by the broken line, so that the lubricating oil does not become excessive in the low engine speed range. There is. In addition,
Reference numeral 6 in the figure indicates a carburetor.

[0005]

[Problems to be Solved by the Invention] However, in the invention described in the above-mentioned publication, all of the oil discharged from the oil pump 1 is returned to the oil tank 5 at the time of relief of lubricating oil, so that the lubricating oil is kept at a constant speed when the engine rotates. There is a possibility that proper control may not be possible depending on the number. For example, when the opening degree of the throttle valve 4 is fully open, there is a possibility that the amount of lubricating oil with respect to the engine speed cannot be properly controlled.

The present invention has been made in consideration of the above-mentioned circumstances, and provides a vehicle in which the amount of lubricating oil can be properly controlled according to the engine speed, and the amount of lubricating oil supplied particularly in the low engine speed range can be reduced. The purpose of the present invention is to provide a lubricating device for engines for [Structure of the invention]

[0007]

[Means for Solving the Problems] The present invention provides a separate oil supply oil pump driven by an engine, which has a suction port and a plurality of discharge ports, the suction port of the oil pump is connected to an oil tank, and the plurality of oil pumps have a suction port and a plurality of discharge ports. At least one of the discharge ports
is connected to the engine and the oil tank via a switching valve, and the switching valve is controlled to supply lubricating oil discharged from the oil pump from the oil tank to the engine at a predetermined engine speed or higher. It is characterized by:

[0008]

[Operation] Therefore, according to the vehicle engine lubricating device according to the present invention, the oil pump is provided with a plurality of discharge ports, and the switching valve connected to at least one of the plurality of discharge ports, Since lubricating oil is relieved to the oil tank when the engine speed is below a predetermined rotation speed, a part of the lubricating oil discharged from the oil pump can be relieved to the oil tank. As a result, the amount of lubricating oil supplied to the engine can be appropriately controlled according to the engine speed.
In particular, the amount of lubricating oil supplied to the engine can be reduced in the low engine speed range.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of a lubrication system for a vehicle engine according to the present invention, and FIG.
2 is a pipe diagram and an electric circuit diagram of one embodiment of FIG. 1. FIG.

As shown in FIG. 1, a two-stroke engine 1
0 is equipped with a carburetor 12 in the intake passage 11, and furthermore, 2
A lubrication device 13 that supplies lubricating oil to the cycle engine 10 is provided.

The lubricating device 13 is of a separate oil supply type that supplies lubricating oil in an oil tank 14 into the engine 10 by the action of an oil pump 15. Solenoid valves 16A and 16B, switches 17, 18 and 1
9 and a control device 20.

The oil pump 15 is driven by a crankshaft (not shown) of the engine 10, and its suction port 21 is connected to the oil tank 14 via a suction hose 22. Further, as shown in FIG. 2, the oil pump 15 is provided with two discharge ports 23A and 23B, and these discharge ports 23A and 23B are connected to electromagnetic valves 16A and 16B through discharge hoses 24A and 24B, respectively. be done.

The solenoid valve 16A is connected to the intake passage 11 via an oil supply hose 25A, and is further connected to the relief hose 2.
It is connected to the oil tank 14 via 6A. Further, the solenoid valve 16B is connected to the engine 10 through the oil supply hose 25B.
and further connected to the oil tank 14 via the relief hose 26B. By switching these solenoid valves 16A and 16B, the lubricating oil discharged from the oil pump 15 flows into the intake passage 11 and the engine 10.
, or selectively supplied to the oil tank 14.

The switching operation of the solenoid valve 16A is performed by turning on and off a switch 17, and the operation of the solenoid valve 16B is performed by turning on and off switches 18 and 19. Of these, switches 18 and 19 are connected in series. And the switches 17, 18 and 19
The control device 20 controls the ON/OFF operation.

The control device 20, when the engine speed of the engine 10 reaches a predetermined speed Na (FIG. 3) or higher,
Turn on switch 17. Further, the control device 20 turns on the switch 18 when the engine speed reaches a predetermined speed Nb (Nb>Na). Further, the control device 20 turns off the switch 19 when the gear position of the transmission connected to the engine 10 is neutral, and turns on the switch 19 when the gear position is not neutral.

Therefore, when the gear position of the transmission is neutral, the switch 19 is set to O.
Since the FF operates, the solenoid valve 16B is demagnetized, and the lubricating oil discharged from the discharge port 23B of the oil pump 15 is relieved to the oil tank 14 via the relief hose 26B. At this time, the engine speed is Na
In the following, the switch 17 is turned off and the solenoid valve 16
Since A is demagnetized, the discharge port 23A of the oil pump 15
The lubricating oil discharged from the pump is relieved to the oil tank 14 via the relief hose 26A, and no lubricating oil is supplied to the engine 10 from the oil pump 15 (see solid line 28 in FIG. 3).

Furthermore, when the engine speed rises and exceeds Na in the neutral state, the switch 17 is turned ON, the solenoid valve 16A is energized, and the lubricating oil discharged from the outlet 23A of the oil pump 15 is supplied with oil. It is guided to the intake passage 11 via the hose 25A (broken line 2 in FIG. 3).
(see 7). In this neutral state, even if the engine speed exceeds Nb and the switch 18 is turned ON, the switch 19 is turned OFF, so the solenoid valve 16 is turned OFF.
B is not excited, and the lubricating oil discharged from the discharge port 23B is guided to the oil tank 14 via the relief hose 26A, and is not supplied to the engine 10 (as indicated by the broken line 27 in FIG. 3).
reference).

On the other hand, when the gear position of the transmission is other than neutral, the switch 19 is always turned on. At this time, when the engine speed is below Na, both switches 17 and 18 are turned off, and both solenoid valves 16A and 16B are in a demagnetized state. Therefore, the lubricating oil discharged from the discharge ports 23A and 23B of the oil pump 15 is transferred to the relief hose 26, respectively.
A and 26B, the oil is relieved to the oil tank 14, and is not supplied to the engine 10 (see solid line 28 in FIG. 3).

When the engine speed exceeds Na in a case other than the neutral state, the switch 17 is turned on and the solenoid valve 16A is energized. For this reason, oil pump 1
The lubricating oil discharged from the discharge port 23A of No. 5 is guided to the intake passage 11 via the oil supply hose 25A (Fig. 3
(see solid line 28). Thereafter, when the engine speed becomes equal to or higher than Nb, the switch 18 is also turned on. At this time,
Since the switch 19 is turned on, the solenoid valve 16B
is excited, and the lubricating oil discharged from the discharge port 23B of the oil pump 15 is also guided to the engine 10 via the oil supply hose 25B, increasing the amount of oil supplied to the engine 10 (see solid line 28 in FIG. 3). .

According to the above embodiment, the engine speed is N
When the engine speed is below a, all the lubricating oil from the oil pump 15 is relieved to the oil tank 14, and the engine speed is Na.
When the number of rotations is above Nb, the lubricating oil discharged only from the oil discharge port 23A of the oil pump 15 is supplied to the engine 10 via the solenoid valve 16A, and when the engine speed is equal to or higher than Nb, the lubricating oil discharged only from the oil discharge port 23A of the oil pump 15 is supplied to the engine 10. 23A and 2
The lubricating oil discharged from 3B is connected to each solenoid valve 16A.
and 16B to the engine 10. in this way,
Since the amount of lubricating oil led to the engine 10 is controlled according to the engine speed, the amount of lubricating oil supplied to the engine 10 is appropriate. Especially in the engine low rotation range (Nb
The amount of lubricating oil supplied in (below) can be reduced, so
The generation of white smoke can also be suppressed.

When the transmission is in the neutral gear position, only the lubricating oil that has passed through the solenoid valve 16A is supplied from the outlet 23A of the oil pump 15 to the engine 10, and the lubricating oil discharged from the outlet 23B is supplied to the oil tank. Because it will be relieved to 14,
The amount of lubricating oil supplied to the engine 10 during this neutral state can also be reduced.

As shown in FIG. 4, during the time t until the engine speed reaches Na, the switch 17 is turned on and off at a predetermined cycle, and the oil pump 15 discharges during this time t. Lubricating oil may be intermittently supplied to the engine 10 from the outlet 23A. For example, time t
is approximately 40 seconds, the switch 17 is turned on and off.
The operation may be repeated approximately every 10 seconds, and half of the amount of oil supplied when the solenoid valve 16A is energized for approximately 40 seconds may be supplied to the engine 10.

Furthermore, in the above embodiment shown in FIGS. 1 to 3,
Although the oil pump 15 has two discharge ports,
Three or more discharge ports may be provided, three or more electromagnetic valves may be provided corresponding to each discharge port, and control may be performed in the same manner as in the above embodiment. In this case, as shown in FIG. 5, the lubricating oil guided from the oil pump 15 to the engine 10 can be controlled in three or more stages depending on the engine speed.

Furthermore, the release hose 26A, solenoid valve 16A and switch 17A in the above embodiment shown in FIGS. 1 to 3 are removed, and the discharge port 23A of the oil pump 15 is
may be directly connected to the intake passage 11 via the oil supply hose 25A. In this case, as shown in FIG. 6, lubricating oil is supplied to the oil supply hose 25A even when the transmission mission position is neutral.
The fuel is supplied to the engine 10 through (see broken line 29 in FIG. 6). Furthermore, in cases other than neutral, lubricating oil is always supplied to the engine 10 from the outlet 23A of the oil pump 15 regardless of the engine speed, and when the engine speed exceeds Nb, the solenoid valve 25B is energized. The lubricating oil discharged from the outlet 23B of the oil pump 15 is also supplied to the engine 10, and the amount of lubricating oil supplied increases (see solid line 30 in FIG. 6).

[0026]

[Effects of the Invention] As described above, according to the lubrication device for a vehicle engine according to the present invention, a plurality of discharge ports are installed in the oil pump for separating oil supply driven by the engine, and the plurality of discharge ports are At least one is connected to an engine and an oil tank via a switching valve, and the switching valve is controlled to supply lubricating oil discharged from the oil pump from the oil tank to the engine at a predetermined engine speed or higher. Therefore, the amount of lubricating oil supplied can be appropriately controlled according to the engine speed, and the amount of lubricating oil supplied can be particularly reduced in the low engine speed range.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of a lubrication device for a vehicle engine according to the present invention.

FIG. 2 is a pipe diagram and an electric circuit diagram in one embodiment of FIG. 1;

FIG. 3 is a graph showing the amount of oil supplied to the engine in the embodiment of FIG. 1;

FIG. 4 is a graph showing the oil supply amount in the first modification example of FIG. 1;

FIG. 5 is a graph showing the oil supply amount in a second modification example of FIG. 1;

FIG. 6 is a graph showing the oil supply amount in a third modification example of FIG. 1;

FIG. 7 is a schematic configuration diagram showing a conventional vehicle engine lubricating device.

[Explanation of symbols]

10 2-stroke engine 13 Lubrication device 14 Oil tank 15 Oil pump 16A, 16B Solenoid valve 21 Suction port 23A, 23B Discharge port 25A, 25B Oil supply hose 26A, 26B Relief hose NA, Nb Predetermined rotation speed

Claims (1)

[Claims] 1. An oil pump for separate oil supply driven by an engine, comprising a suction port and a plurality of discharge ports, the suction port of the oil pump being connected to an oil tank, and at least one of the plurality of discharge ports being a switching valve. The switching valve is connected to the engine and the oil tank through the
A lubricating device for a vehicle engine, characterized in that switching control is performed so that lubricating oil discharged from the oil pump is supplied from the oil tank to the engine at a predetermined engine speed or higher.