JPH0382687A - Lubricating oil cooling structure of motorcycle - Google Patents

Abstract

PURPOSE:To maintain sufficient tank capacity by constituting an oil tank of a main pipe, a tension pipe, a down tube inside space and a triangular space, and making engine oil run through the respective pipe, tube and triangular space successively. CONSTITUTION:The front edge of a main pipe 2b extending to the rear of a vehicle is welding-fixed to the upper part of a head pipe 2a located at a front edge of a vehicle body frame 2 in a motorcycle 1, and an upper edge of a down tube 2c extending downward is welding-fixed to the lower part of the pipe 2a respectively, portions next to the head pipe connecting parts of pipes 2b, 2c, are mutually welded with a vertical reinforcing pipe 2e. These pipes 2b - 2e form a zone of a approximately triangular shape, and the right and left sides of the zone are blocked with a plate 69 to form a triangular space A. The respective pipes 2b - 2e are made to communicate with each other through communicating openings 70a - 70e and the pipes 2e, 2d are mutually communicated with the triangular space A through communicating openings 70d - 70f, which constitutes an oil tank.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a lubricating oil cooling structure for motorcycles, and in particular to an oil tank shape that improves engine oil cooling performance by lengthening the oil passage. and related to improving oil circulation paths.

[Conventional technology]

Motorcycles sometimes adopt a cooling structure in which engine lubricating oil is circulated between a separate oil tank and during this circulation, the engine oil is cooled by running air and maintained at a predetermined temperature. be. As such a cooling structure, there is a conventional structure in which a main pipe, a down tube, and a space inside a tension pipe connecting the two are used as a lubricating oil tank, as described in, for example, Japanese Utility Model Publication No. 56-8781. With this structure, there is no need to provide a separate oil tank, which is advantageous in terms of securing the space for arranging the oil tank.

[Problem that the invention seeks to solve]

However, in the conventional structure described above, since the tank capacity is limited by the size of the main pipe, etc., it is difficult to ensure a sufficient tank capacity. Therefore, the amount of time the engine oil remains in the tank is short, that is, the amount of time the oil is exposed to the traveling wind is short, and the amount of time the oil is inside the engine is longer, resulting in the problem that the oil cannot be cooled sufficiently.

The present invention has been made in view of the above-mentioned conventional problems.
The purpose of the present invention is to provide a lubricating oil cooling structure for a motorcycle that secures a sufficient capacity of the oil tank and increases the oil passage length so that the oil can be sufficiently exposed to running air and maintain the oil temperature at a desired temperature. It is said that

[Means for solving problems]

The present invention includes a main pipe extending rearward from the head pipe, a down tube extending downward from the head pipe,
In a motorcycle equipped with a body frame having a tensile pipe connecting the front parts of the down tube and the main pipe, the oil tank and the engine are connected in an annular manner through an oil passage to circulate lubricating oil. A lubricating oil cooling structure in which the oil tank is surrounded by at least a part of the space in the main pipe, the down tube, and the tensilan pipe, and the main pipe, the down tube, and the tensilan pipe. A triangular space is formed by closing the left and right sides of a substantially triangular area with plates, and the engine oil flows into the triangular space from the tensilan pipe and further flows out into the tensilan pipe. It is characterized in that the tensilan pipe and the triangular space communicate with each other at two or more locations with an interval between them, and the above-mentioned path also constitutes a part of the oil passage.

When the engine is suspended by the tensile pipe, the cross-sectional area of the suspension section generally becomes narrow and passage resistance increases, so it is desirable to provide the communication holes on both sides of the suspension section.

[Effect]

According to the lubricating oil cooling structure according to the present invention, the hend pipe,
The space inside the down tube and tensile pipe is used as a lubricating oil tank, and the triangular space formed by the three frame members is also covered with plates on both sides, so the tank capacity is sufficient. can be secured. In addition, since the tension pipe and the triangular space are communicated at two or more places, even when the engine is suspended by the tension run pipe, the flow of lubricating oil will not deteriorate due to the passage resistance of the suspension part, and the lubricating oil It flows smoothly through a long circulation path from the main pipe to the ten-run pipe, the triangular space, the ten-shin pipe, and the down tube.

As the tank capacity increases and the circulation path becomes longer, the time the oil spends in the tank and passages becomes longer than the time it takes in the engine, and the oil is exposed to sufficient airflow, allowing the oil to be cooled to the desired temperature. can be maintained. Further, since the oil is reliably circulated along the above-mentioned path, the oil is supplied into the engine in an orderly manner, and from this point of view as well, the oil is reliably cooled.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 are diagrams for explaining a lubricating oil cooling structure for a motorcycle according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a motorcycle in which the structure of this embodiment is adopted, and the front end of a main pipe 2b extending toward the rear of the vehicle is attached to the upper part of a head pipe 2a located at the front end of a body frame 2 of the motorcycle 1. The upper ends of the down tubes 2C extending downward are each welded and fixed to the lower part, and the parts of the main pipe 2b and the down tube 2c that are closest to the head pipe connection part are vertical reinforcing pipes 2d, and the rear parts thereof are substantially horizontal. They are mutually welded and connected by a tensile pipe 2e. Further, the front ends of a pair of left and right seat rails 2f are welded and fixed to the rear end of the main pipe 2b via a bracket 2g, and each seat rail 2f extends approximately horizontally to the rear end of the vehicle and is interconnected. has been done. Further, upper ends of a pair of left and right support vibes 2h extending substantially vertically downward are welded and fixed to the bracket 2g, and are connected to each other by a cross pipe (not shown). 21 is a backstay that connects the seat rail 2f and the rear pipe 2h.

The above-mentioned rear pipe 2a supports a front fork 3 which pivotally supports a front wheel at its lower end so as to be steerable left and right, and the rear pipe 2h supports a rear arm 5 which pivotally supports a rear wheel 4 at its rear end up and down. It is pivoted so that it can swing freely. Furthermore, a fuel tank 6 is mounted to surround the upper part of the main pipe 2b, and a seat 7 is mounted to cover the upper part of the seat rail 2f.

Reference numeral 9a denotes a wind guide plate that introduces running wind to the left and right sides of the fuel tank 6 and near the engine.An outside air intake port 9C is formed at the front end of the wind guide plate 9a, and an outside air intake port 9C is formed at the front end of the air guide plate 9a. An outlet 9d is formed. Note that 9b is a side cowl that covers the lower part of the seat 7, and 8 is a rear cowl that surrounds the upper part of the rear end of the vehicle.

Engine oil 1-10 is mounted in a portion of the vehicle body frame 2 surrounded by the down tube 2C, tension pipe 2e, and rear pipe 2h. This engine unit 10 is a so-called 4-pulp engine, which is an air-cooled 4-stroke single-cylinder engine and has two intake valves and two exhaust valves. Note that 11 is a vaporizer.

The upper end portion of the engine unit 10 is suspended and supported near the center of the tension pipe 2e. That is,
A support pipe 67 fixed so as to pass through the stay portion 10a formed on the head cover and the tension pipe 2e is held between a pair of left and right support plates 66, and support bolts 68a are inserted into the upper and lower ends of the plates. shi, oak)
It is suspended and supported by tightening with 68b.

A roughly triangular area is formed by the head pipe 2b, down tube 2C, tension pipe 2e, and vertical reinforcing pipe 2d located near the head pipe connecting portion. The left and right sides of this area are closed by plates 69, thereby forming a triangular space A. In addition, the main pipe 2b and the tension pipe 2e
, the connection between the tension pipe 2e and the down tube 2c, and the connection between the vertical reinforcing pipe 2d and the down tube 2c, respectively, are provided with communicating lowers 0a and 70b.
, and 70c are formed. Also, the above triangular space A
and the tension pipe 2e are in front of the support vibrator 67,
Are the space A and the vertical reinforcing vibe 2d communicated through the communication lowers 0d and 70e located at the rear? They are communicated with each other. As a result, an oil tank is constituted by each of the pipes, tubes, and triangular spaces.

Note that 70h is a hole for air venting.

Further, the lower end of the down tube 2C and the bottom of the crank case 10b of the engine unit 10 are connected to each other through a supply tube 71a.

Although not shown, a suction pump and a discharge pump are disposed within the crankcase 10b, and the supply tube 71a is connected to the suction pump via a filter. Also, the above discharge pump has a return tube 71.
b is connected.

This return tube 71b extends outward through the ceiling of the crankcase 10b and is inserted into the triangular space A, and its tip is inserted from the space A into the main pipe 2b and is located at the top of the pipe 2b. It's open. As a result, an oil passage is constructed in which engine oil is circulated between the oil tank and the crankcase job, which are constituted by the above-mentioned pipes, triangular space A, and the like. Note that 72 is a camp that opens and closes the lubricating oil supply port, and 73 is a breather that releases air from within the oil tank.

Next, the effects of this embodiment will be explained.

In this embodiment, the engine oil is returned to the upper part of the main vibe 2b through the return tube 71b by the discharge pump, flows into the triangular space A from the rear of the main pipe 2b and the tension vibe 2e, and from there flows into the tension pipe 2e or through the vertical reinforcing pipe 2d into the down tube 2C, and is supplied to the crankcase 10b again by the suction pump through the supply pipe 71a. While the engine oil is flowing outside the engine, it is cooled by the running wind introduced from the outside air intake port 90 of the baffle plate 9a.

In this way, in this embodiment, each pipe 2a, 2. b.

2a, tube 2c, and triangular space A, sufficient tank capacity can be ensured, and since the oil flows through these parts in sequence, the oil passage length becomes longer, resulting in improved engine oil cooling performance. can be greatly improved.

Regarding the tension pipe 2e, the engine suspension support pipe 67 passes through it near the center, which creates passage resistance, but since it passes through the triangular area A, the suspension support section obstructs the flow of engine oil. This will ensure a smooth flow. Since the engine oil flows through the long oil passage in an orderly manner and is supplied to the engine in this way, all the oil can be used uniformly, and from this point of view as well, the cooling performance of the oil can be improved.

In the above embodiment, the case where the vertical reinforcing pipe 2d is provided has been described, but the present invention can of course be applied to the case where the vertical reinforcing pipe is not provided. Further, in the above embodiment, the case where the engine is suspended by the tension pipe 2e has been described, but the present invention can of course be applied to the case where the tension pipe 2e does not have an engine suspension part.

[Effects of the Invention] As described above, according to the lubricating oil cooling structure for a motorcycle according to the present invention, the oil tank is composed of the main pipe, the tension pipe, the down tube inner space, and the triangular space, and the engine oil is Since the oil flows sequentially through each pipe, tube, and triangular space, sufficient tank capacity can be ensured, and the length of the oil passage can be increased, which has the effect of greatly improving the cooling performance of engine oil.

[Brief explanation of drawings]

1 to 5 are diagrams for explaining a lubricating oil cooling structure for a motorcycle according to an embodiment of the present invention, in which FIG. 1 is a cross-sectional side view of the oil tank portion, and FIG. 2 is a left side view. ,
FIG. 3 is a sectional front view of the engine suspension section, FIG. 4 is a plan view, and FIG. 5 is a left side view of the motorcycle to which this embodiment is applied. In the figure, l is a motorcycle, 2 is a body frame, 2a
is hend pipe, 2b is main pipe, 2c is down tube, 2e is tension pipe, 10 is engine, 7
0e and 70d are connected roads, and A is a triangular space.

Claims (1)

[Claims] (1) A main pipe extending rearward from the head pipe,
In a motorcycle equipped with a body frame having a down tube extending downward from a head pipe and a tension pipe connecting the down tube and the front parts of the main pipe, an oil tank and an engine are connected in an annular manner by an oil passage. A lubricating oil cooling structure for circulating lubricating oil, the oil tank being connected to at least a part of the space in the main pipe, the down tube, and the tension pipe, and the main pipe, the down tube, and the tension pipe. It is composed of a triangular space formed by blocking the left and right sides of a substantially triangular area surrounded by the tension pipe with plates, and the lubricating oil flows into the triangular space from the tension pipe and then flows out into the tension pipe again. A lubricating oil cooling structure for a motorcycle, characterized in that the tension pipe and the triangular space communicate with each other at two or more locations with an interval between them.