JPH0211721B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a lubrication device for a motorcycle,
More specifically, the present invention relates to an improvement in the installation position of an oil filter.

(Prior Art) Motorcycles have traditionally been equipped with a lubricating device that pumps oil from an oil tank to various parts of the engine through an oil filter. As shown in the figure, it is attached to the lower part of the front wall of the engine's crankcase so that it protrudes forward.

(Problem to be Solved by the Invention) However, when the oil filter is arranged as described above, the front and rear dimensions of the engine become large. The problem is that the wheelbase must be increased, which causes the vehicle itself to become larger.

On the other hand, if the oil filter is attached to the rear part of the upper wall of the crankcase, it is possible to prevent the front and rear dimensions of the engine from becoming larger, but in order for the driver to feel a sense of unity with the vehicle body, the driver may have to hold the fuel tank and frame between his legs.
When the user performs a so-called knee grip, the oil filter hits the leg, causing a problem in that the sense of unity is impaired.

The present invention has been made in view of the above problems, and its purpose is to avoid increasing the front and rear dimensions of the engine and increasing the size of the vehicle body, and to prevent the oil filter from being attached to the driver's leg when riding the vehicle. An object of the present invention is to provide a lubrication device for a motorcycle that does not cause contact.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a motorcycle having an engine disposed between the front and rear wheels, and a circulation pump that supplies pressure to each part of the engine via an oil filter. In the lubrication system, the engine is a front and rear V-type multi-cylinder engine, and the front and rear cylinders of the engine are offset to opposite sides in the vehicle width direction, and the crankcase is formed on the opposite side to the offset direction of the front cylinder. It is characterized in that the oil filter is disposed at the upper part of the upper wall.

(Function) Since the oil filter is placed on the upper part of the upper wall of the crankcase on the opposite side to the offset direction of the front cylinder, the oil filter no longer protrudes forward of the engine as in the conventional case, increasing the front-to-back dimensions of the engine. This makes it possible to suppress the wheelbase and prevent the vehicle body from becoming larger. Further, since the oil filter is located on the side of the front cylinder, that is, at the upper part of the upper wall of the crankcase, it is possible to prevent the driver's legs from coming into contact with the oil filter when riding the vehicle.

(Embodiment) A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

Figure 1 is a side view of the motorcycle, Figure 2 is an enlarged side view of the engine section of the motorcycle, Figure 3 is a sectional view taken along line 3-3 in Figure 2, and Figure 4 is a sectional view taken along line 4-4 in Figure 2. 5 is a partially enlarged view of FIG. 4, FIG. 6 is a side view of the vehicle body frame, and FIG. 7 is a front view of the same.

In the motorcycle 1 shown in FIG. 1, a head pipe 3 is fixed to the front of the body frame 2, an upper part of a front fork 4 is fixed to the head pipe 3, and a steering wheel is attached to the lower part of the front fork 4. A front wheel 5 forming the main body is rotatably supported.

Further, a fuel tank 6 is located behind the head pipe 3.
However, seats 7 are provided further rearward, and a V-type engine 8 is mounted and supported on the vehicle body frame 2 below the fuel tank 6.

This engine 8 has two cylinders, front and rear, forming a V-shape in side view, and as shown in FIG. 3, the front and rear cylinders are offset from each other in the width direction of the vehicle body. That is, the front cylinder is slightly offset to the left, and the rear cylinder is slightly offset to the right.

On the other hand, as shown in the figure, a rear fork 9 is pivotally attached to the vehicle body frame 2 at its front end so as to be able to swing freely.
At the rear end of the rear fork 9 is a rear wheel 1 that forms a driving wheel.
0 is rotatably supported.

By the way, since the front cylinder of the engine 8 is offset to the left in plan view, a predetermined space is secured on the right side of the front cylinder on the upper surface of the upper wall of the crankcase 11 (on the opposite side to the offset direction of the front cylinder). , an oil filter 12 is installed in this space via a filter base 13.

Next, the structure of the lubricating device according to the present invention will be explained based on FIGS. 2 to 7.

The crankcase 11 has two parts as shown in FIG.
It is a split type, and the left crankcase is 11L.
and a right side crankcase 11R, within which a pump shaft 14 is rotatably supported. An oil pump 1 is installed on the left and right sides of the pump shaft 14.
5 and 16 are installed, one oil pump 15 constitutes a tank pressure pump for pumping oil to an oil tank 28 to be described later, and the other oil pump 16 constitutes a tank pressure pump for supplying oil to various parts of the engine. Configure the circulation pump. A tuning sprocket 17 is located at the right end of the pump shaft 14.
is fixed, and a chain 20 is stretched between the sprocket 17 and a sprocket 19 fixed to the end of the engine output shaft 18 shown in FIG.
The rotation of the output shaft 18 is transmitted to the pump shaft 14,
As a result, the pump shaft 14 is driven to rotate.

A discharge pipe 21 extending forward and upward of the vehicle body is connected to the discharge side of the tank pressure pump 15 inside the crankcase 11, and a suction pipe 22 is connected to the suction side of the circulation pump 16. A discharge pipe 23 is connected to each side, and the discharge pipe 23 is connected to the oil filter 12 disposed on the same side as the circulation pump 16. Note that the oil filter 12 and beyond are connected to various parts of the engine.

As shown in FIG. 5, a straight pipe portion 24a of a joint pipe 24 is connected between the left and right crankcases 11L and 11R so that its both ends communicate with the discharge pipe 21 and the suction pipe 22, respectively. This joint pipe 24 is attached to both ends with seal rings 25, 25 when joining the left and right crankcases 11L, 11R during assembly.
By inserting them into the crankcases 11L and 11R through the screws, they can be assembled and set at the same time, so there is no need for bolts or the like for fastening.

Then, the straight pipe portion 2 of the joint pipe 24 is
The inside of 4a is divided into left and right by a partition wall 24b, and an oil supply pipe 26 and an oil return pipe 27 are branched from the left and right sides of the partition wall 24b of the straight pipe portion 24a, respectively.
Each pipe 26, 27 is connected to an oil tank 28 installed in front of the engine 8. In addition, 29 in FIG. 5 is an oil strainer. In addition, 44 in the drawing
is a joint hose that connects the pipes 26, 27 and the tank 28.

By the way, details of the body frame 2 of the motorcycle 1 are shown in FIGS. 6 and 7. In the figures, numeral 30 is a main frame to which the head pipe 3 is fixed at the front and rear of the main frame. A down tube 31 made of a thick square pipe hangs down, and the down tube 31 and a cross member 32 installed below are connected to the oil tank 28.
It consists of

The lower end of a flexible pipe 33 housed in a space surrounded by the fuel tank 6 is connected to the upper side of the down tube 31, and the upper end of the pipe 33 is attached to the main frame 30 with a support. 34. Incidentally, this flexible pipe 33 is used to supply oil to the oil tank 28, and an oil supply port opening at the upper end of the flexible pipe 33 is closed by a cap 35.

Further, an oil inlet seat 36 is provided at the upper part of the down tube 31, and the oil supply pipe 26 is connected to the inlet seat 36, while an oil outlet seat 37 is provided at the side of the cross member 32. The outlet seat 37 is provided with the oil return pipe 27.
are connected.

In FIG. 6, 38 is a down tube blower, 39 is a center pipe, 40 is a seat rail, and 41 is a rear stay, all of which are made of square pipes.

Incidentally, the interior of the main frame 30 is a cavity, and an air filter element 42 having a U-shaped side cross section is housed in the cavity, and the upper surface of the air filter element 42 is closed with a cover 43. The air filter element 42 has a structure that can be removed together with the cover 43 to facilitate maintenance.

Therefore, while the engine 8 is operating, both pumps 15,1
6 is driven, and one tank pressure pump 15 circulates through each part of the engine and pumps the crankcase 1.
The oil that collects at the bottom of 1 is removed by oil strainer 29.
The oil is pumped through the discharge pipe 21, the oil supply pipe 26 of the joint pipe 24, etc. to the oil tank 28. At the same time, the other circulation pump 16 sucks the oil stored in the tank 28 as described above through the suction pipe 22, increases its pressure, and then sends it to each part of the engine via the discharge pipe 23 and the oil filter 12. After lubricating each part of the engine, this oil falls to the lower part of the crankcase 1 and accumulates there, and is sucked into the tank pressure pump 15 again, and thereafter the same cycle is repeated to lubricate each part of the engine.

In the above, according to this embodiment, the oil filter 12 is arranged at the upper part of the upper wall of the crankcase 11 on the opposite side to the offset direction of the front cylinder.
There is nothing protruding from the front and rear of the crankcase 11, and the longitudinal length of the engine can be suppressed, thereby preventing the vehicle body from becoming larger. Furthermore, there is no protrusion at the rear of the crankcase where the driver's legs (not shown) are located, so the driver's legs are not interfered with. Furthermore, since the oil filter 12 and the circulation pump 16 are installed on the same side, the oil filter 12 and the circulation pump 16
The discharge pipe 23 connecting the two can be shortened, allowing for rational piping, and it is possible to prevent the engine from becoming larger.

(Effects of the Invention) As described above, according to the present invention, since the oil filter is disposed at the upper part of the upper wall of the crankcase on the opposite side to the offset direction of the front cylinder, an increase in the longitudinal length of the engine is prevented. This can prevent the vehicle body from becoming larger. Furthermore, it is possible to prevent the driver's legs from coming into contact with the oil filter when riding the vehicle.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall side view of the motorcycle, FIG. 2 is an enlarged side view of the engine section of the motorcycle, and FIG.
Figure 3 is a sectional view taken along the line 3-3, Figure 4 is a sectional view taken along the line 4-4 in Figure 2, Figure 5 is a partially enlarged view of Figure 4, Figure 6 is a side view of the body frame, and Figure 7 is the same front view. It is a diagram. In the drawing, 8 is the engine, 11 is the crankcase, 12 is the oil filter, 14 is the pump shaft, 1
5 and 16 are oil pumps, and 28 is an oil tank.

Claims (1)

[Scope of Claims] 1. A lubricating device for a motorcycle including an engine disposed between the front and rear wheels and a circulation pump that pumps oil to each part of the engine via an oil filter, wherein the engine has a V-type front and rear wheels. With a multi-cylinder engine,
The front and rear cylinders of the engine are formed offset to opposite sides in the width direction of the vehicle body, and the oil filter is disposed on the upper part of the upper wall of the crankcase on the opposite side to the offset direction of the front cylinder. Motorcycle lubricating device.