JPH0353155B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricating device for a motorcycle. Conventionally, in this type of device, as shown in FIG. 1, for example, a lubrication circuit e is used to supply lubricating oil sucked up from an oil pan a by an oil pump b through a strainer c to each lubricating point d such as the crankshaft of the engine. In general, a cooling circuit g with an oil cooler f interposed is inserted in series, and in this case, in order to simplify the piping to the oil cooler f, which is located apart from the engine, It is also known that the frame pipe h is also used as an oil pipe leading to the oil cooler f to form the cooling circuit g, but in this case, when welding metal fittings such as an oil supply joint into the frame pipe h, Welding spatters and oxidized scale left behind,
Since this gets mixed into the lubricating oil, comparatively coarse foreign matter such as welding spatter is placed between the lubrication circuit e and the cooling circuit g on the upstream side in addition to the filter j for filtering fine particles such as chips. It is necessary to separately provide a strainer i for removing the particles, which is accompanied by the inconvenience of poor assembly and maintenance.

In order to eliminate this inconvenience, the present invention eliminates the strainer on the outflow side by returning the lubricating oil led from the outflow side of the oil cooler via the frame pipe to the oil pan without directly supplying it to the lubrication area. The purpose of this device is to provide a device that provides a lubricating oil cooling circuit in which the frame pipe of a two-wheeled motor vehicle is also used as an oil pipe leading to an oil cooler. The cooling circuit is connected in parallel to a lubrication circuit that supplies lubricating oil sucked up by a pump through a strainer to each lubricating point, and the lubricating oil flowing out from the oil cooler is returned to the oil pan. Features. Next, the present invention will be explained with reference to embodiments shown in FIG. 2 and below.

In Fig. 2, 1 is the body of a two-wheeled motor vehicle, 2 is an engine mounted in the middle of the body, and between frame pipes 1b, 1b consisting of a pair of left and right down tubes extending downward from the head pipe 1a of the body 1. As shown in FIG. 3, an oil cooler 3 is installed, and both ends of each of the frame pipes 1b, 1b are closed with an oil cap 4 which also serves as a connection joint on the side of the head pipe 1a and an oil cap 5 on the rear end side. The frame pipes 1b, 1b are connected to the cooler 3.
The cooler 3 is connected to the engine 2 by piping, which also serves as oil pipes on the inflow side and the outflow side leading to the engine 2, thereby forming a lubricating oil cooling circuit 6 as described later.

In the drawing, 7 indicates an oil pan provided at the bottom of the crankcase 2a of the engine 2.
As shown in FIG. 5, the lubricating oil inside is sucked up through a strainer 9 by an oil pump 8, and then transferred to a lubrication circuit 1 with a paper filter or other filter 10 interposed therebetween.
1, the bearings of the crankshaft 12 and other lubrication points are supplied with oil. In the drawings, reference numeral 13 indicates a relief valve provided in the oil passage 14 on the inflow side of the filter 10.

According to the present invention, the cooling circuit 6 is connected in parallel to the lubricating circuit 11, and the oil cooler 3
The lubricating oil flowing out from the oil pan 7 is made to flow back to the oil pan 7, and to be described in more detail with reference to the one shown in FIG. One side of the frame pipe 1b constitutes the inflow side oil pipe of the cooler 3 at the discharge port 8a of B, and the outflow of the cooler 3 is provided at the oil pan 7. The frame pipes 1b on the other side constituting the side oil pipes shall be connected to each other, and each frame pipe 1b
As shown in FIG. 4, a base 15 fixed thereto is connected to a base 16 connected to the discharge port 8a on the engine side and the oil pan 7 via a flexible joint pipe 17. .

Next, to explain its operation, the oil caps 4, 5 and the base 14 described above are welded to each frame pipe 1b, and welding spatter and welding scale generated during welding remain in each frame pipe 1b. However, foreign matter such as welding spatter may be mixed into the lubricating oil that is returned from the oil cooler 3 to the oil pan 7, but these foreign matter are removed by the strainer 9 on the suction side of the oil pump 8, and The filter 10 that intervenes in the lubrication circuit 11 will not be adversely affected by these coarse foreign substances.

Further, even if the cooling circuit 6 and the lubricating circuit 11 are provided in parallel, the lubricating oil returned from the cooling circuit 6 and the lubricating oil returned from the lubricating circuit 11 via each lubrication point are mixed in the oil pan 7. The lubrication circuit 11
Approximately half of the lubricating oil returned from the cooling circuit 6
The same lubricating oil is not used to lubricate only the lubricating circuit 11, and an increase in oil temperature is sufficiently prevented.

In the above embodiment, the discharge port 8 of the oil pump 8
A is provided in a pair, and the cooling circuit 6 is connected to one side, and the lubricating circuit 11 is connected to the other side, so that both 6 and 11 are connected in parallel. The oil passage 1 on the inflow side of the filter 10 connected to this has one discharge port 8a in common.
The cooling circuit 6 may be connected to a connection port 18 branched from the cooling circuit 4.

In this way, according to the present invention, a cooling circuit in which the oil cooler is connected via a frame pipe is provided in parallel to the lubrication circuit, so that the lubricating oil flowing out from the oil cooler is returned to the oil pan. Even if this lubricating oil is contaminated with foreign matter remaining in the frame pipe, such as welding spatter,
The foreign matter is removed by the strainer on the suction side of the oil pump and prevented from flowing into the lubrication circuit, eliminating the need to provide a separate strainer on the outflow side of the cooling circuit.
This has the effect of reliably eliminating the disadvantages of the conventional type described above.

[Brief explanation of drawings]

Figure 1 is a lubricating oil circulation circuit diagram of a conventional device, Figure 2 is a side view of the body of a motorcycle equipped with the device of the present invention, Figure 3 is its front view, and Figure 4 is its frame pipe. FIG. 5 is a cut-away plan view of the piping connection part between the engine and the engine side, FIG.
The figure is a circuit diagram of another embodiment. 1b... Frame pipe, 3... Oil cooler, 6... Cooling circuit, 7... Oil pan, 8...
Oil pump, 9... strainer, 11... lubrication circuit.

Claims (1)

[Claims] 1 In motorcycles where the frame pipe of a motorcycle is also used as an oil pipe leading to an oil cooler to form a lubricating oil cooling circuit, each lubricating point is supplied with lubricating oil sucked up from the oil pan via a strainer by an oil pump. 1. A lubrication device for a two-wheeled motor vehicle, characterized in that the cooling circuit is connected in parallel to a lubrication circuit for lubrication, and the lubricating oil flowing out from the oil cooler is circulated to the oil pan.