JPH05288027A - Lubricating oil supply device for motorcycle engine - Google Patents

Abstract

PURPOSE:To prevent lubricating oil staying in an oil tank from making back flow into an engine through an oil return passage, when a motorcycle is left in the condition of engine stop for a long time, so as to favorably maintain startability and the like of the engine. CONSTITUTION:An oil quantity adjusting valve 24 is provided, by which lubricating oil 17 discharged from an oil pump 19 is alternately led into an engine 4 through an oil passage 23 and into an oil tank 20 through an oil return passage 38. The oil quantity adjusting valve 24 closes the oil return passage 38 in the engine 4 stop condition. The oil quantity adjusting valve 24 is arranged in a position lower than the level 40 of the lubricating oil 17 in the oil tank 20 in the engine 4 stop condition. The return port 39 of the oil return passage 38 opening against the oil tank 20 is arranged above the level 40 of the lubricating oil 17 in the oil tank 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil supply device for a motorcycle engine, which is provided with an oil amount adjusting valve for alternately guiding the lubricating oil discharged from an oil pump into the engine and the oil tank.

[0002]

2. Description of the Related Art Conventionally, the above-mentioned lubricating oil supply device has been constructed as follows. That is, the oil pump driven by the engine is provided at a position lower than the oil tank, and the lubricating oil is supplied from the oil tank to the oil pump. Further, an oil amount adjusting valve is provided, and when the oil amount adjusting valve is opened and closed, the lubricating oil discharged from the oil pump is alternately introduced into the engine and the oil tank through the oil return passage. Get burned. Then, the opening / closing operation of the oil amount adjusting valve is performed at a predetermined pitch, whereby an amount of lubricating oil corresponding to each operating state of the engine is supplied to the engine. Further, in this case, when the engine is stopped, the oil amount adjustment valve closes the oil return passage.

[0003]

By the way, since the surplus space in a motorcycle is extremely limited and narrow, it is desired that the lubricating oil supply device be as compact as possible. On the other hand, when the motorcycle is left for a long time with the engine stopped, the oil amount adjustment valve closes the oil return passage, but if there is a slight gap here, the lubricating oil in the oil tank Lubricating oil in the oil tank may flow back through the oil return passage through the gap of the oil amount adjusting valve located at a position lower than the liquid level and enter the engine. Then, when this occurs, the consumption of the lubricating oil becomes excessive, or the spark plug gets wet with the lubricating oil, and the startability deteriorates.

[0004]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to the above circumstances, and an object thereof is to make a lubricating oil supply device compact, and to keep a motorcycle for a long time with an engine stopped. If left unattended, it is necessary to prevent the lubricating oil in the oil tank from flowing backwards through the oil return passage and trying to enter the engine, thus ensuring good engine startability. To aim.

[0005]

To achieve the above object, the present invention is characterized in that an oil pump driven by an engine is provided at a position lower than an oil tank, and lubrication discharged from the oil pump is carried out. An oil amount adjusting valve for guiding the oil alternately through the oil passage and through the oil returning passage to the inside of the oil tank is provided, and when the engine is stopped, the oil amount adjusting valve causes the oil return passage to pass through the oil returning passage. In the case where it is closed, the oil amount adjusting valve is arranged at a position lower than the liquid level of the lubricating oil in the oil tank when the engine is stopped, and the oil return passage opening to the oil tank is the same as above. The return port is located above the liquid level of the lubricating oil in the oil tank.

[0006]

[Operation] The operation of the above configuration is as follows. The oil pump 19 driven by the engine 4 is provided at a position lower than the oil tank 20, and the lubricating oil 17 discharged from the oil pump 19 is passed through the oil passage 23 and the engine 4 and the oil return passage 38. An oil amount adjusting valve 24 that alternately leads to the inside of the oil tank 20 is provided, and the engine 4
In the stopped state, when the oil amount adjusting valve 24 closes the oil return passage 38, the oil amount is adjusted more than the liquid level 40 of the lubricating oil 17 in the oil tank 20 in the stopped state of the engine 4. The valve 24 is arranged in a low position. Therefore, the oil pump 19 and the oil amount adjusting valve 2 are
Since 4 is located below the liquid level 40 of the lubricating oil 17 in the oil tank 20, the oil pump 19 and the oil amount adjusting valve 24 can be arranged close to each other. From the oil passage 2 to the oil quantity adjusting valve 24
3 can be shortened.

On the other hand, the return port 39 of the oil return passage 38 opening to the oil tank 20 is located above the liquid level 40 of the lubricating oil 17 in the oil tank 20. Therefore, when the oil pump 19 is stopped due to the stop of the engine 4, the lubricating oil 1 in the oil tank 20
7 is prevented from flowing back from the return port 39 through the oil return passage 38 to the oil amount adjusting valve 24 side, that is, the lubricating oil 17 passes through the oil amount adjusting valve 24 and the engine 4
Trying to get in is prevented.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIGS. 1 to 3 show a first embodiment.
In FIGS. 1 and 2, reference numeral 1 denotes a motorcycle, an arrow Fr in the drawing indicates the front thereof, and the left and right described below refer to the direction toward the front. A front wheel and a handle are supported on a front portion of a body frame 2 of the motorcycle 1 via a front fork, and a rear wheel is supported on a rear portion thereof via a rear arm 3. An engine 4 is supported on the vehicle body frame 2, and the engine 4 drives the rear wheels. The engine 4 is a pre-compression type two-cycle single-cylinder engine, and includes a crankcase 5 and a cylinder 6 protruding from the crankcase 5 toward the front upper side.

An intake port is formed in the cylinder 6,
The reed valve 8, the intake pipe 9, the carburetor 10,
Also, the air cleaner 11 is sequentially connected. In this case, the reed valve 8, the intake pipe 9, and the carburetor 10 are fastened together to the cylinder 6 by four bolts 12. Further, 13 is a spark plug, and 14 is an exhaust pipe.

When the engine 4 is operated, the outside air 15 is passed through the air cleaner 11, the carburetor 10, the intake pipe 9 and the reed valve 8 in order, and the outside air 15 is passed through.
Inhaled into. Fuel is mixed with the outside air 15 through the carburetor 10, and the mixture is pre-compressed in the crankcase 5, which is used for combustion in the cylinder 6.

A lubricating oil supply device 18 for supplying the lubricating oil 17 is provided in the engine 4. The lubricating oil supply device 18 is a reciprocating oil pump (autolube pump).
19. The oil pump 19 has a crankcase 5
It is detachably screwed to the right side wall of the. The oil pump 19 is driven by the engine 4 so as to be synchronized with the rotation speed of the engine 4, that is, the oil pump 19 has an amount of lubricating oil 17 corresponding to the rotation speed of the engine 4.
Is discharged.

Reference numeral 20 denotes a resin-made oil tank for storing the lubricating oil 17, and the oil tank 20 is provided at the rear portion of the vehicle body frame 2 with a pair of front and rear supporting pieces 20a, 20a and a bolt 2
It is supported by 0b and 20b. The oil pump 19 is provided at a lower position than the oil tank 20, and the lubricating oil 17 in the oil tank 20 is passed through an oil supply pipe 21 to allow the oil pump 19 to flow naturally.
Is supplied to. The oil supply pipe 21 is made of a flexible resin tube.

An oil passage 23 for guiding the lubricating oil 17 discharged from the oil pump 19 into the engine 4 is provided. The oil passage 23 is made of a flexible resin tube, and the oil passage 23 communicates with the intake pipe 9. The oil passage 23 includes an upstream pipe 23a on the oil pump 19 side and a downstream pipe 23 on the intake pipe 9 side.
It is divided into b and. An oil amount adjusting valve 24, which is a solenoid valve, is interposed between the divided ends, and the oil amount adjusting valve 24 can open and close the oil passage 23. The oil amount adjusting valve 24 is arranged at a position lower than the liquid level 40 of the lubricating oil 17 in the oil tank 20 when the engine 4 is stopped. Also, the oil amount adjusting valve 24
Is detachably screwed to a bracket 25 that is fastened together with the bolt 12 by a bolt 26, and
The bracket 25 is supported on the cylinder 6 side via a cushioning material 27.

In FIG. 3, the oil amount adjusting valve 24 has a valve case 28. A lubricating oil inlet 29 is formed in the upper part of the valve case 28, a lubricating oil outlet 30 is formed in the lower end of the same valve case 28, and the lubricating oil inlet 29 is communicated with the lubricating oil outlet 30 in the same valve case 28. Oil passage 3
1 is formed. An elastic valve body 32 made of rubber is provided which can open and close the middle part of the oil passage 31.
Is fitted to an annular magnetic body 33. Further, a spring 34 for urging the valve body 32 in the direction of opening the oil passage 31 is provided.

A solenoid 35 is provided in the valve case 28 corresponding to the magnetic body 33. Then, when the solenoid 35 is turned off, the valve element 32 is biased by the spring 34 to open the return port 39 as shown in the figure, that is, the oil amount adjusting valve 24 is opened. on the other hand,
When the solenoid 35 is turned on, the spring 3
4, the magnetic body 33 is connected to the solenoid 35 with the valve body 32.
When the valve body 32 is pulled toward the side, the valve body 32 closes the oil passage 31, that is, the oil amount adjusting valve 24 closes.

A lubricating oil return port 37 is formed at the upper end of the valve case 28, and the lubricating oil return port 37 and the oil passage 3 are formed.
The valve element 32 is interposed between the valve element 32 and the valve 1. Then, as described above, when the solenoid 35 is turned off and the valve body 32 opens the oil passage 31, the valve body 32 closes the lubricating oil return port 37 as shown in the figure. On the other hand, when the solenoid 35 is turned on and the valve body 32 closes the oil passage 31 as described above, the valve body 32 opens the lubricating oil return port 37, and the lubricating oil return port 37 is connected to the lubricating oil inlet port. 29 are in communication.

In FIGS. 1 to 3, the lubricating oil inlet 2 is shown.
The upstream side pipe 23a of the oil passage 23 is connected to 9, and the downstream side pipe 23b of the oil passage 23 is connected to the lubricating oil outlet 30. Further, an oil return passage 38 extends from the lubricating oil outlet 30 and the extended end is at the oil tank 20.
Is linked to.

When the solenoid 35 of the oil amount adjusting valve 24 is turned off in the operating state of the engine 4, the oil passage 31 of the oil amount adjusting valve 24 is opened as described above, while the lubricating oil return ports 37 are closed. Be done. Then, the lubricating oil 17 discharged from the oil pump 19 interlocked with the engine 4 is
Through the upstream pipe 23a of the oil passage 23, the lubricating oil inlet 29
After being supplied to the lubricating oil outlet 30, it flows to the lubricating oil outlet 30 as indicated by an arrow A in FIG. Further, from here, it flows toward the inside of the engine 4 through the downstream side pipe 23b of the oil passage 23, and the lubricating oil 17 is supplied into the engine 4 together with the air-fuel mixture.

On the other hand, when the solenoid 35 is turned on, the oil passage 31 is closed and the lubricating oil return port 37 is opened, as described above. Then, the oil pump 19
The lubricating oil 17 supplied from the lubricating oil inlet 29 to the lubricating oil inlet 29 flows to the lubricating oil return port 37 as indicated by an arrow B in FIG. Then, the lubricating oil 17 is returned to the oil tank 20 through the lubricating oil return port 37 and the oil return passage 38.

Electronic control means for controlling the opening / closing operation of the oil amount adjusting valve 24 is provided. That is, the solenoid 35 of the oil amount adjusting valve 24 is automatically repeatedly turned off and on by this control means, and the oil amount adjusting valve 24 is opened and closed as described above, whereby the oil pump 19 discharges the oil. The lubricating oil 17 is alternately guided into the engine 4 and the oil tank 20 through the oil return passage 38. Further, at this time, each OFF period of the solenoid 35 of the oil amount adjusting valve 24 is made constant, while the rotation speed of the engine 4, the throttle opening degree of the carburetor 10, the temperature of the lubricating oil 17 and the like are set. Thus, the ON period of each solenoid 35 is adjusted, and as a result, the amount of the lubricating oil 17 corresponding to each operating state of the engine 4 is accurately supplied.

In FIG. 1, the return port 39 of the oil return passage 38 that opens to the oil tank 20 is disposed above the oil tank 20, that is, the return port 39 lubricates the oil tank 20. It is located above the liquid level 40 of the oil 17.

Therefore, when the oil pump 19 is stopped due to the stop of the engine 4, the lubricating oil 17 in the oil tank 20 passes from the return port 39 to the oil amount adjusting valve 24 side through the oil return passage 38. Attempts to backflow are prevented. That is, the lubricating oil 17 is prevented from entering the engine 4 through the oil amount adjusting valve 24.

In this way, even when the motorcycle 1 is left for a long time with the engine 4 stopped, the lubricating oil 17 in the oil tank 20 is prevented from entering the engine 4, and the engine 4 is started. Good quality is maintained.

As described above, the oil pump 19 and the oil amount adjusting valve 24 are both attached to the engine 4, and the oil pump 19 and the oil amount adjusting valve 24 are provided close to each other. Therefore, since the oil passage 23 from the oil pump 19 to the oil amount adjusting valve 24 can be shortened, the structure of the oil passage 23 can be simplified, and the oil passage for the oil pump 19 and the oil amount adjusting valve 24 is the same as above. 23 can be easily assembled.

Further, since the engine 4 has high rigidity, the assembling accuracy of the oil pump 19, the oil passage 23, and the oil amount adjusting valve 24 is improved. In addition, the engine 4 includes an oil pump 19, an oil passage 23,
With the oil quantity adjusting valve 24 and the oil quantity adjusting valve 24 assembled, they can be integrally attached to the vehicle body frame 2 side.
Therefore, the workability of assembling the lubricating oil supply device 18 is also improved. In addition, 41 is a breather pipe for the oil tank 20.

(Second Embodiment) FIGS. 4 to 6 show a second embodiment. The oil tank 20 is a tank body 4 made of resin.
3, and each of the support pieces 20a is projectingly provided at the front and rear ends of the tank body 43. A cylindrical oil supply port 44 is integrally formed on the upper surface of the rear portion of the tank body 43, and a cap 45 is detachably attached to the oil supply port 44.
The cap 45 is composed of a cylindrical portion 46 which is removably fitted into the oil supply port 44, and a lid portion 47 which is integrally molded with the upper end of the cylindrical portion 46. In this case, the inner peripheral surface of the fuel filling port 44 and the outer peripheral surface of the cylindrical portion 46 are formed with circumferential grooves that mesh with each other, and these are elastically deformed to each other so that the cylindrical portion 46 is fitted into and disengaged from the fuel filling port 44. It is freely inserted. A connecting pipe 48 that extends in a substantially horizontal direction is integrally formed on the upper surface of the lid portion 47.
One end of 8 opens toward the outside of the tank body 43, and the other end opens into the cylindrical portion 46, which serves as a return port 39. One end of a joint pipe 49 is attached to one end of the connecting pipe 48.
The oil return passage 38 is detachably connected to the other end of 9. Also, 50 and 51 are clips.

When the lubricating oil 17 is supplied to the oil tank 20, the cap 45 is provided with the oil supply port 44 while the oil return passage 38 is attached to the other end of the joint pipe 49.
And then refuel. According to the above configuration, since the return port 39 is formed in the cap 45, the return port 39 does not have to be separately provided in the oil tank 20, and the configuration is simplified. Further, by replacing the conventional cap with the cap 45 having the above-mentioned configuration, the oil return passage 38 can be easily connected to the existing oil tank 20. Note that the other configurations and operations are the same as those of the above-described embodiment, but the oil pump 19 may be provided in the same manner as that shown in FIGS.

[0028]

According to the present invention, the oil pump driven by the engine is provided at a position lower than the oil tank, and the lubricating oil discharged from the oil pump is passed through the oil passage to the inside of the engine and the oil return. In the case where the oil amount adjusting valve that alternately guides through the passage and into the oil tank is provided, and the engine amount is stopped when the oil amount adjusting valve closes the oil return passage, The oil amount adjusting valve is arranged at a position lower than the liquid level of the lubricating oil in the oil tank. Therefore, since the oil pump and the oil amount adjusting valve are both located below the liquid level of the lubricating oil in the oil tank, the oil pump and the oil amount adjusting valve can be arranged close to each other. The oil passage from the oil pump to the oil amount adjusting valve can be shortened. Therefore, as described above, the oil pump and the oil amount adjusting valve can be brought close to each other, and the oil passage can be shortened, so that the lubricating oil supply device can be made compact, and the pressure loss of the lubricating oil flowing through the oil passage is also reduced. Can be made smaller.

On the other hand, since the return port of the oil return passage opening to the oil tank is located above the liquid level of the lubricating oil in the oil tank, the oil pump is stopped when the engine is stopped. At this time, the lubricating oil in the oil tank is prevented from attempting to flow backward from the return port through the oil return passage to the oil amount adjusting valve side, that is, the lubricating oil passes through the oil amount adjusting valve to the engine. Trying to get in is prevented. Therefore, even if the motorcycle is left for a long time with the engine stopped, the lubricating oil in the oil tank is prevented from entering the engine,
The startability and the like of this engine are kept good.

[Brief description of drawings]

FIG. 1 is a side view of a lubricating oil supply device according to a first embodiment.

FIG. 2 is a plan view of the lubricating oil supply device according to the first embodiment.

FIG. 3 is a vertical cross-sectional view of the oil amount adjustment valve according to the first embodiment.

FIG. 4 is a side view of the lubricating oil supply device according to the second embodiment.

FIG. 5 is a plan view of the lubricating oil supply device according to the second embodiment.

FIG. 6 is a partially enlarged cross-sectional view of FIG. 4 in the second embodiment.

[Explanation of symbols]

 1 Motorcycle 4 Engine 5 Crankcase 17 Lubricating Oil 18 Lubricating Oil Supply Device 19 Oil Pump 20 Oil Tank 23 Oil Passage 24 Oil Volume Control Valve 38 Oil Return Passage 39 Return Port 40 Liquid Level

Claims (1)

[Claims] 1. An oil pump driven by an engine is provided at a position lower than an oil tank, and lubricating oil is supplied from the oil tank to the oil pump.
An oil amount adjusting valve for guiding the lubricating oil discharged from the oil pump alternately through the oil passage into the engine and through the oil return passage into the oil tank is provided. In a lubricating oil supply device for a motorcycle engine, wherein the adjusting valve closes the oil return passage, the oil amount adjusting valve is set to a position lower than the liquid level of the lubricating oil in the oil tank when the engine is stopped. Arranged
A lubricating oil supply device for a motorcycle engine, wherein the return port of the oil return passage opening to the oil tank is arranged above the liquid level of the lubricating oil in the oil tank.