JPH0431915B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention provides a four-cycle
This invention relates to an engine lubricating device.

Conventional technology The lubrication method for four-stroke engines is as follows:
The wet sump system creates an oil sump at the bottom of the crankcase and stores lubricating oil at all times in the oil sump, and the other uses a lubrication oil storage tank separate from the engine to maintain lubrication inside the engine. The finished lubricating oil is sent to the lubricating oil reservoir through the delivery pipe, and the lubricating oil that is supplied to each lubricating part in the engine is sent back from the lubricating oil reservoir to the engine through the return pipe, so that the lubricating oil is not stored in the crankcase. There is a dry sump system.

Problems to be Solved by the Invention However, with a dry oil sump type lubrication device, when servicing the engine or replacing lubricating oil, it is necessary to not only drain the lubricating oil from the crankcase through the oil drain hole provided in the bottom wall of the crankcase. , it is also necessary to drain the lubricating oil in the separate lubricating oil storage tank. If the oil drain hole for this purpose is provided in a separate lubricating oil storage tank, other equipment will get in the way, making it difficult to drain the lubricating oil, and there is a possibility that other equipment will be contaminated with lubricating oil during the extraction process. There is.

Means and Effects for Solving Problems An object of the present invention is to provide an engine lubricating device that allows easy extraction of lubricating oil from a lubricating oil storage tank separate from the engine.

In the dry oil sump type lubrication system for a four-cycle engine according to the present invention, each part of the oil return pipe and the delivery pipe that connect the separate lubricating oil storage tank arranged at the rear of the engine and the front part of the engine are attached to the lower body frame. The oil drain joint installed along the oil return pipe is fixed to the lower body frame, and when performing engine maintenance or lubricating oil replacement, the sealing plug attached to the oil drain joint can be removed and removed. I do.

Embodiment An embodiment of the present invention shown in FIGS. 1 and 2 will be described below. FIG. 1 schematically shows a motorcycle 10 equipped with a four-cycle engine E as a front view of the left main part. The body frame consists of a head pipe 12, a main pipe 14 connected to the head pipe 12, a down tube 16 also connected to the head pipe 12, a pair of left and right center pillars 18 connected to the rear end of the main pipe 14, and a down tube at the tip thereof. tube 1
6, a pair of left and right lower pipes (lower body frame) 20 that are connected to the center pillar 18 at the rear end, a pair of left and right seat rails 22 that are connected to the top of the center pillar 18, and the center pillar 18. A pair of left and right back stays 24 connected to the seat rail 22 are formed as main frame members.

The engine E is disposed in a space surrounded by a down tube 16, a center pillar 18, and a lower pipe 20, and an air cleaner AC is disposed in a triangular space surrounded by a center pillar 18, a seat rail 22, and a back stay 24. There is. A lubricating oil storage tank (hereinafter referred to as an oil tank) 50 is also disposed at a position offset to the right side of the vehicle body in the triangular space near the connection between the center pillar 18 and the backstay 24. In this position, the oil tank 50 is connected to the air cleaner AC,
It is surrounded by the engine E, the center pillar 18, the back stay 24, the rear fender RF, the rear fork pivot bolt 62, the rear fork 60, and the like.

Further, the oil return pipe 30 that guides the lubricating oil in the oil tank 50 to the engine E has one end connected to the bottom wall of the oil tank, and the other end connected to the bottom wall of the crankcase CC at the front of the engine E. There is. A delivery pipe 40 that guides the lubricating oil in the engine E to the oil tank 50 has one end connected to the bottom wall of the crankcase CC at the front of the engine E, and the other end connected to the top wall of the oil tank 50. .

Parts of both the oil return pipe 30 and the delivery pipe 40 are arranged along the lower pipe 20, and an oil drain joint 36 attached to the oil return pipe is welded and fixed to the side wall surface of the lower pipe 20 at the center of the vehicle body. (See the figure. However, FIG. 2 is a view taken along the - line arrow in FIG. 1). Most of the oil return pipe 30 is formed of a flexible hose 32, but the oil drain joint 36 part is
Connection steel pipe 34 attached to the end of the flexible hose 32
The flared tip of the oil drain joint 36
A cup-shaped fastening nut 38 is fitted onto the connecting pipe 37 of the connecting pipe 37 to tighten them by utilizing the threaded relationship with the connecting pipe 37. A female screw is formed in the oil drain hole of the oil drain joint 36,
The oil drain hole is sealed by threading a sealing plug (drain bolt) 39.

This embodiment is configured as described above, and when the engine is in operation, an oil pump (not shown) disposed in the crankcase CC operates, and lubricating oil in the engine E is pumped through the delivery pipe 40. The lubricating oil in the oil tank 50 is sent to the engine E through the oil tank 50.

According to this configuration, the oil tank 50 is surrounded by the air cleaner AC, the engine E, the center pillar 18, the backstay 24, the rear fork pivot bolt 62, the rear fork 60, etc., so it is less susceptible to external forces and is less susceptible to damage. No worries.

Additionally, an oil tank 50, a delivery pipe 40, and an oil return pipe 30, which are members whose temperature increases during engine operation, are also included.
However, since they are not exposed on the outer surface of the vehicle, there is no need to worry about the occupants coming into contact with them.

Further, since the oil drain joint 36 is fixed to the lower pipe 20, the operator can easily and quickly attach and detach the sealing plug 39 when maintaining the engine or changing the oil.
By providing 6 near the oil drain hole provided in the bottom wall of the crankcase, it is possible to receive lubricating oil with a single receiving container.

Furthermore, the cap 52 of the oil tank 50
By covering the outside with a side cover or the like, it is possible to avoid mischief while parking.

Note that the oil drain joint 36 is not limited to welding, but can also be fixed using bolts 36A as shown in FIG.

Effects of the Invention As is clear from the above description, in the present invention, each part of the return oil pipe and the delivery pipe that connect the separate lubricating oil storage tank arranged at the rear of the engine and the front part of the engine are attached to the lower body frame. Since the oil drain joint provided on the return oil pipe is fixed to the lower body frame, the sealing plug of the oil drain joint can be easily and quickly installed without contaminating other equipment during engine maintenance or oil changes. Can be attached and detached.

[Brief explanation of drawings]

FIG. 1 is a left side schematic front view of a motorcycle equipped with an engine lubricating device according to an embodiment of the present invention;
The figure is a view taken along the - line arrow in FIG. 1, and FIG. 3 is a view similar to FIG. 2 showing an oil drain joint mounting structure of a lubricating device according to another embodiment. 10...Motorcycle, 12...Head pipe,
14... Main pipe, 16... Down tube, 18... Center pillar, 20... Lower pipe, 22... Seat rail, 24... Back stay, 30... Oil return pipe, 32... Flexible hose, 34
...steel pipe, 36 ... oil drain joint, 37 ... connection pipe, 38 ... tightening nut, 39 ... sealing plug (drain bolt), 40 ... delivery pipe, 50 ... lubricating oil reservoir (oil tank), 52... cap,
60...Rear fork, 62...Pivot bolt.

Claims (1)

[Scope of Claims] 1. A four-cycle engine and a separate lubricating oil storage tank are provided, and the engine and the lubricating oil storage tank are connected to each other by an oil return pipe and a delivery pipe to form an oil circulation path. In the motorcycle, the lubricating oil storage tank is provided at the rear of the engine, a portion of the return oil pipe and the delivery pipe are arranged along the lower body frame, and they are connected to the front part of the engine, An engine lubricating device for a motorcycle, characterized in that an oil drain joint provided on an oil return pipe is fixed to the lower body frame.