JPS5918090Y2 - motorcycle oil supply device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil supply device for a motorcycle equipped with a two-stroke engine, which is characterized in that an oil pump is driven by the rotational force of a drive shaft.

Conventionally, an oil supply system for a motorcycle equipped with a two-stroke engine has been configured as follows.

That is, an oil pump is connected to the crankshaft of a two-cycle engine via an oil pump drive gear, an oil pump driven gear, etc., and the oil pump is driven in conjunction with the rotation of the crankshaft.

However, in addition to the above-mentioned oil pump drive gear, it is necessary to install gears for rear wheel drive on the crankshaft, so installing gears specifically for driving the oil pump increases weight and cost. Not only was this a nuisance, but the increased length of the crankshaft also increased the width of the engine, which was a major obstacle in designing a compact engine.

Further, in the conventional apparatus described above, the machining of the crankcase becomes complicated and a machining unit in the direction of the pump mounting seat is required, resulting in a disadvantage that the dedicated machining machine becomes complicated and the number of machining steps increases.

The purpose of the present invention is to eliminate the drawbacks of the above-mentioned prior art,
To provide an oil supply device for motorcycles equipped with a 2-stroke engine that eliminates gears dedicated to driving the oil pump, facilitates a compact engine design, and also simplifies processing of the crankcase. be.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

A crankshaft 1 of a two-stroke engine is rotatably supported by a crankcase 2 via a bearing 3, and a gear 4 and a centrifugal clutch 5 are attached to the crankshaft 1.

A gear 6 is fixed to the driven side of the centrifugal clutch 5.
is rotatable with respect to the crankshaft 1.

A countershaft 7 is also fixedly supported on the crankcase 2, and a gear 8 rotatably supported by the countershaft 7 meshes with the gear 6.

A sprocket 9 is rotatably supported on the countershaft 7, and the sprocket 9 is coupled to a gear 8 via a dog 10.

On the other hand, the clutch cover 17 has a kick lever 11'
The kick lever shaft 11a is rotatably supported, and a gear 12 is integrally fixed to the kick lever shaft 11a.

Reference numeral 13 indicates a notarth spring interposed between the gear 12 and the crankcase 2.

The gear 12 meshes with a gear 14 rotatably supported by the counter shirts 1 to 7, and a gear 15 is attached to the gear 14 via a threaded spline 14a.

16 is a return spring for returning the gear 15 to the solid line position in the figure.

A drive shaft 19 for rotationally driving the rear wheel 18 is located outside the depression stroke of the kick lever 11, and one end of the drive shaft 19 is rotatably supported by the clutch cover 17, and a sprocket 20 is fixed to the drive shaft 19.

A chain 21 is wound between the sprocket 9 and the sprocket 20.

The oil pump 22 is fixed to the clutch cover 17 and is located in parallel to the drive shaft 19.
2a is directly connected to the drive shaft 19 by groove coupling.

23 is a suction side oil hose, and 24 is a discharge side oil hose.

Reference numeral 25 indicates an oil pump cover, and the oil pump cover 25 is attached to the clutch cover 17 by poles 1-26 and 27.
is attached to.

Note that 28 indicates the oil hose groove.

The action will be explained below.

To start the engine, the kick lever 11 is kicked to rotate the gear 12, and the rotational force of the suck lever shaft 11a is transferred to the gear 14.

When the gear 14 rotates, the gear 15 moves to the left in the figure and rotates together with the gear 14, meshing with the gear 4 and rotating the crank shirt 1.

This causes the engine to start and the crankshaft 1 to rotate.

Thereafter, the gear 15 returns to its original position by the spring force of the return spring 16.

When the engine is idling, the centrifugal clutch 5 is disengaged, so the rotational force of the crankshaft 1 is transferred to the rear wheel 1.
8 is not transmitted.

When the engine crankshaft 1 reaches a rotation speed above a certain value, the centrifugal clutch 5 engages and the crankshaft 1
The rotational force is transmitted from the driven side of the centrifugal clutch 5 to the gear 6, gear 8, dog 10, sprocket 9, chain 21, and sprocket 20 in this order, thereby causing the drive shaft 19 to rotate.

When the drive shaft 19 rotates, its rotational force is transmitted to the rear wheel 18, and the rotating shaft 2 of the oil pump 22
2a is also transmitted, and the oil pump 22 is operated.

As explained above, according to the oil supply device of the present invention, the oil pump can be installed side by side in the drive shirt I~ with sufficient space, and the oil pump drive which was conventionally installed on the crankshaft of the engine can be used. Since gears and other oil pump drive parts are eliminated, the length of the crankshaft can be shortened, resulting in the effect that a compact engine can be easily provided.

It goes without saying that if an engine with a smaller width is provided, the motorcycle will be easier to handle.

Also, since the oil pump drive parts can be completely eliminated,
This has a significant effect on weight reduction and cost reduction.

Furthermore, since the oil pump installation work can be done from the same direction as the installation work of other kick levers, etc., work efficiency is extremely high, and the degree of machining of the crankcase, clutch cover, etc. can be significantly reduced. will occur.

Note that in the oil supply device of the above embodiment, the oil pump does not operate in the rotation range where the centrifugal clutch is not engaged, but the period in which the oil pump is inactive is short and at the same time the number of revolutions during this period is low. Therefore, sufficient lubrication is possible using only the oil accumulated in the crank chamber.

[Brief explanation of drawings]

The figure is a sectional view of essential parts showing an embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] A motorcycle power unit in which a crankshaft, a countershaft, and a driveshaft are arranged in parallel, these shafts and a chain that drives the driveshaft are covered with an integral cover, and a rear wheel is attached to the driveshaft. A kick lever is disposed on the side of the drive shirt I, which is connected to the crankshaft via a countershaft, and an oil pump is disposed at the end of the drive shirt I outside the depression stroke of the kick lever. An oil supply device for a motorcycle, characterized in that a rotating shaft is connected to the drive shaft.