JPH0719973Y2 - Motorcycle oil system - Google Patents

Description

The present invention relates to a tubular body frame member, and more particularly to a motorcycle using a down tube as an oil tank.

2. Description of the Related Art For example, Japanese Patent Publication No. 52-5131 discloses a motorcycle in which a main pipe, a down tube and a tension pipe of a motorcycle frame are connected to each other and used as an oil tank for lubricating oil. In this motorcycle, the oil is supplied from the down tube to the engine. Therefore, an oil discharge port is opened at the closed lower end surface of the down tube, and the oil supply oil passage is connected to this oil discharge port. Therefore, the oil supply oil passage extends downward from the lower end surface of the down tube on the extension line of the down tube.

Problems to be Solved By the way, the down tube extends to a position just in front of the engine mounted on the lower center of the body frame, and particularly in a motorcycle having one down tube along the center line of the vehicle body, the front side of the engine is the front side. In many cases, the exhaust pipe extending toward the lower tube is disposed below the lower end of the down tube. In such a case, if the oil discharge port is provided on the lower end surface of the down tube as described above, the installation and maintenance of the oil supply oil passage or the installation and maintenance of the exhaust pipe become inconvenient. Further, since a pair of lower frames branching left and right from the down tube are joined to the lower end of the down tube, and the oil discharge port is located between these lower frames, it is difficult to approach the oil, It becomes more inconvenient to install and maintain the oil supply passage.

Means and Actions for Solving the Problems The present invention has been made in view of such circumstances,
In the present invention, one down tube extending downward from the head pipe to the vicinity of the exhaust pipe connected to the front surface of the engine, and one down tube joined to the lower end portion of the down tube and branched left and right from the down tube to the engine. A pair of lower frames that extend rearward underneath the vehicle and use the down tube as an oil tank. In the motorcycle, the down frame is located immediately above the joint between one of the pair of lower frames and the down tube. An oil outlet pipe is provided along the side wall of the tube along the one lower frame.

According to the present invention, since the oil outlet pipe for taking out the oil from the down tube projects laterally along the lower frame at the upper part of the lower frame joint portion, the exhaust pipe or the lower pipe is provided at the oil outlet. It can be easily approached from the side without being disturbed by the frame, which facilitates the work of installing the oil supply pipe and the work of maintenance.

Embodiment Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings. First
The figure is an overall side view of a motorcycle to which the present invention is applied, in which 1 is a front wheel and 2 is a rear wheel. The front wheel 1 is rotatably supported by a head pipe 4 provided at the front end of the vehicle body frame 3 via a front fork 5. The rear wheel 2 is suspended by a rear lower part of the vehicle body frame 3 via a rear fork 6 whose front end is pivotally supported so as to be vertically swingable. 7 is a rear cushion.

A fuel tank 8 is provided on the front side of the upper portion of the vehicle body frame 3 so as to straddle it, and a seat 9 is provided on the rear portion thereof. An engine 10 is mounted in the lower center of the body frame 3, and the rear wheels 2 are driven by the engine. The engine intake air is taken into the engine 10 from the air cleaner 11 provided below the seat 9 through the carburetor 12, and the engine exhaust air is provided in the exhaust port 13 provided on the front surface of the cylinder of the engine 10.
Is discharged to the exhaust pipe 14. The exhaust pipe 14 extends forward from the exhaust port 13 and then bends laterally and downward as shown in FIG. 3 and then bends upward and extends rearward along the side of the vehicle body. As shown in FIG. 3, the rear wheel 2 is opened rearward.

FIG. 2 shows the fuel tank 8 and the cover in FIG.
It is drawing which showed the front upper part of the vehicle body frame 3 hidden by 15 in more detail by a partial cross section. Head pipe 4
Main pipe 16 at the top of the rear surface, down tube at the bottom
17 is stuck. The main pipe 16 and the down tube 17 are arranged along the center plane of the vehicle body.
Extends rearward from the head pipe 4 at the upper part of the vehicle body, and the down tube 17 extends rearward obliquely downward from the head pipe 4 and its lower end reaches the front position of the engine 10. The head pipe 4, the main pipe 16 and the down tube 17 are integrally reinforced by a gusset 18, and a reinforcing frame member 19 is hung between the gusset 18 and the main pipe 16. The main pipe 16 and the down tube 17 are configured by hollow tube members having a rectangular cross section. The front ends of the left and right lower frames 20, 20 are welded to both side surfaces of the lower end of the down tube 17 (third part).
See figure). These lower frames 20, 20 branch from the down tube 17 to the left and right, extend obliquely downward and rearward, pass through the lower side of the engine 10 and bend upward at the rear end as shown in FIG. The main pipe 16 is welded to both side surfaces at the rear end thereof.

The hollow portions of the main pipe 16 and the down tube 17 are used as an oil tank that stores oil for engine lubrication. Therefore, the front end and the rear end of the main pipe 16 are liquid-tightly closed by the closing plates 21a and 21b, and the oil injection port 22 is provided on the upper surface of the front part. The upper and lower ends of the down tube 17 are also closed by the closing plates 23a and 23b. The lower frame 20 is a closing plate
It is welded to both side walls of the down tube 17 below 23b. The inside of the main pipe 16 and the inside of the down tube 17 communicate with each other through oil passages 24 and 25 at the front and rear portions, respectively, and the main pipe 16 and the down tube 17 constitute one oil tank. In order to supply oil from the oil tank to the engine 10, the oil outlet pipe 27 is provided at the bottom of the down tube 17.
The oil outlet pipe 27 is connected to the suction port of an oil pump 26 attached to the engine 10 via an oil supply pipe 28. The oil discharged from the oil pump 26 is sent to the carburetor 12, mixed with the engine intake air passing through the carburetor 12, and sent to the engine 10.

The oil outlet pipe 27, as best seen in FIG.
On the left side surface of the down tube 17 to which the left lower frame 20 is welded and joined, at a position close to the joining portion and above the closing plate 23b, project from the down tube 17 laterally, that is, along the lower frame 20. ing. The oil outlet pipe 27 is a hole 29 provided on the side wall of the down tube 17.
The inner end portion is fitted into and welded to the side wall. Since this portion is the portion in which the down tube 17 is reinforced by the lower frame 20 and the closing plate 23b, a highly rigid oil outlet structure can be obtained.

A cylindrical oil strainer 31 having a peripheral wall portion formed of a metal net 30 is fitted into the oil outlet pipe 27 from an opening at an outer end portion. The oil strainer 31 has a circumferential flange 31a near its outer end, and the flange 31a is connected to the oil supply pipe.
The connection piece 32 of 28 is pressed against the end surface of the oil outlet pipe 27 and held in the oil outlet pipe 27. The connecting piece 32 is fitted on the outer peripheral surface of the oil outlet pipe 27, and is fixed to the oil outlet pipe 27 by the tightening band 33. Since the oil outlet pipe 27 projects laterally from the down tube 17 above the lower frame 20 as described above, the exhaust pipe disposed below the lower frame 20 and the down tube 17 and close thereto. Therefore, the oil strainer 31 and the connecting piece 32 can be easily attached to and removed from the oil outlet pipe 27.

As described above, in the present invention, one down tube extending downward from the head pipe to the vicinity of the exhaust pipe connected to the front surface of the engine and the down tube joined to the lower end portion of the down tube A motorcycle including a pair of lower frames that branch leftward and rightward and extend rearward below the engine, wherein one of the pair of lower frames is joined to the downtube in a motorcycle that uses the downtube as an oil tank. Since an oil outlet pipe is provided on the side wall portion of the down tube along the one of the lower frames at a position directly above the section, the oil outlet from the down tube is not disturbed by the exhaust pipe or the lower frame. It is easily accessible from the user, so the work of installing and maintaining the oil supply pipe is easy, and the oil outlet has high rigidity. Can be configured.

[Brief description of drawings]

FIG. 1 is an overall side view of a motorcycle to which the present invention is applied, FIG. 2 is a drawing showing a front upper portion of a vehicle body frame of FIG. 1 in more detail in a partial cross section, and FIG. 3 is a lower end portion of a down tube. It is the sectional view which looked at from the back. 1 ... front wheel, 2 ... rear wheel, 3 ... body frame, 4 ...
Head pipe, 5 ... front fork, 6 ... rear fork, 7 ... rear cushion, 8 ... fuel tank, 9
...... Seat, 10 ...... Engine, 11 ...... Air cleaner, 12
…… Vaporizer, 13 …… Exhaust port, 14 …… Exhaust pipe, 15 ……
Cover, 16 ... Main pipe, 17 ... Down tube,
18 ... Gusset, 19 ... Reinforcing frame material, 20 ... Lower frame, 21 ... Blocking plate, 22 ... Oil inlet, 23 ... Blocking plate, 24, 25 ... Oil pipe, 26 ... Oil pump , 27 ……
Oil outlet pipe, 28 …… Oil supply pipe, 29 …… Hole, 30 …… Wire mesh, 31 …… Oil strainer, 32 …… Connection piece, 33 ……
Tightening band.

Claims (1)

[Scope of utility model registration request] 1. A down tube extending downward from a head pipe to a vicinity of an exhaust pipe connected to a front surface of an engine, and a down tube joined to a lower end portion of the down tube and branched left and right from the down tube. A pair of lower frames that extend rearward underneath the vehicle and use the down tube as an oil tank. In the motorcycle, the down frame is located immediately above the joint between one of the pair of lower frames and the down tube. An oil device for a motorcycle, wherein an oil outlet pipe is provided along a side wall portion of the tube along the one lower frame.