JP3843980B2 - Substructure of a 4-cycle engine for motorcycles - Google Patents

Description

  The present invention relates to a lower structure of a four-cycle engine for a motorcycle, although a plurality of exhaust pipes (exhaust pipes), an oil cooler, and an oil filter are provided in a four-cycle parallel four-cylinder engine for a motorcycle.

In many motorcycles equipped with a 4-cycle multi-cylinder engine, a parallel multi-cylinder engine unit with the crankshaft extending along the width direction of the vehicle body and the cylinder leaning forward is disposed at the front lower part of the vehicle body. Suspended.
In the exhaust system of this engine, the exhaust pipe connected to the exhaust port on the upper front side of the forwardly inclined cylinder is directed downward from the front of the engine unit, and further extends downward to the rear of the engine unit. Alternatively, each is left alone and connected to a muffler disposed at the rear of the vehicle body.

  In the above type of motorcycle, an oil filter and an oil cooler of the engine unit are attached to the front part of the engine case in order to minimize the protrusion to the left and right of the vehicle body as much as possible. In particular, some motorcycles in which the entire vehicle body is covered with a fairing have the oil filter and the oil cooler as described above arranged in parallel in a front view.

  However, an exhaust pipe passes through the oil filter and the oil cooler in front and below. However, when the oil filter and the oil cooler are replaced as they are, the exhaust pipe becomes an obstacle and is difficult to remove and install (the maintainability is difficult). Low).

In the arrangement structure of the oil filter in this type of engine unit, as a conventional technique, an oil cooler is provided at the base of the oil filter, as in the technique disclosed in Japanese Patent Laid-Open No. 7-11955 (Patent Document 1), and As in the technique disclosed in Japanese Patent Laid-Open No. 1-211609 (Patent Document 2), it is conceivable to provide a space between a plurality of exhaust pipes positioned in front of the oil filter.
JP-A-7-11955 Japanese Patent Laid-Open No. 1-211609 JP-A-11-182260

However, with this combination of technologies, an oil filter attached to the front of the oil cooler is attached to the engine, and both the oil cooler and the oil filter are small in order to avoid interference with the exhaust pipe. It becomes necessary to use the one of capacity.
If the capacity of the oil cooler is small, the oil cooling performance is lowered. Therefore, when the high-speed running is continued for a long time, the oil film may be cut or cavitation may occur.

On the other hand, a technique of attaching an oil filter and an oil cooler in parallel to the lower front portion of the engine is conceivable (see Patent Document 3: Japanese Patent Laid-Open No. 11-182260).
However, in the motorcycle described in the publication of Patent Document 3, the protruding tips of the oil filter and the oil cooler are located in a space surrounded by the crankcase and the exhaust pipe in front of the oil filter and the oil cooler. When attaching and detaching a tool to the space and attaching it with a bolt or the like when attaching and detaching the cooler, there is a problem that the workability is low, such as the exhaust pipe being in the way of removing the tool and the need to remove the exhaust pipe. .

  The present invention has been made in view of the above-mentioned problems, and when replacing the oil filter and the oil cooler, the detachable tool can be routed without interfering with the exhaust pipe, thereby improving workability. It is an object of the present invention to provide a substructure for a motorcycle four-cycle engine.

In the present invention, a parallel four-cylinder engine having a crankshaft arranged in the vehicle body width direction is mounted on the lower front side of a motorcycle, and a radiator provided in front of the engine is connected to a water pump provided at the rear of the engine on the side of the engine. The exhaust pipe of the engine is connected to the exhaust port at the upper front of the engine provided for each of the four cylinders at the rear position of the radiator, and is connected to the lower part of the engine from the front of the engine. For motorcycles that are installed under the engine and connected to a muffler disposed at the rear of the vehicle body, and an oil cooler and an oil filter are provided on the front of the engine behind the exhaust pipe In the lower structure of a four-cycle engine, the exhaust pipe is bent into a generally L shape along the lower front part of the engine and extends rearward, and gathers under the engine. An engine oil pan that protrudes downward and is disposed close to the exhaust pipe and is attached to the bottom of the engine case below the engine; and the oil cooler and the oil filter are disposed adjacent to the oil pan. And the exhaust pipe is provided side by side with a gap formed between the exhaust pipes of the four cylinders, and the oil cooler is inserted from the gap of the exhaust pipe. A lower structure of a four-cycle engine for a motorcycle, characterized in that a fastening portion is provided in a gap of an exhaust pipe so as to be detachable by a tool.

In the present invention, a parallel four-cylinder engine having a crankshaft arranged in the vehicle body width direction is mounted on the lower front side of a motorcycle, and a radiator provided in front of the engine is connected to a water pump provided at the rear of the engine on the side of the engine. The exhaust pipe of the engine is connected to the exhaust port at the upper front of the engine provided for each of the four cylinders at the rear position of the radiator, and is connected to the lower part of the engine from the front of the engine. 4 for a motorcycle in which an oil cooler and an oil filter are provided at the front of the engine behind the exhaust pipe. In the lower structure of the cycle engine, the exhaust pipe is bent into a generally L shape along the lower front part of the engine and extends rearward, and gathers under the engine. The engine oil pan protrudes downward and is disposed along the exhaust pipe, and is attached to the bottom of the engine case below the engine, and the oil cooler and the oil filter are provided on the front surface of the engine case. The il filter has a generally cylindrical shape when viewed from the front, and is detachable by rotating around the center of the oil filter, while the oil cooler is a vehicle when viewed from the front. Fastening portions to the engine case are provided on the outer circumferences on both the left and right sides in the width direction, and between the exhaust pipes provided for each of the four cylinders extending forward of the oil filter and the oil cooler toward the lower side of the engine case, characterized in that the detachable tool from the front to the fastening portion of the oil filter center and the oil cooler of the oil filter is formed that can be inserted clearance It is a lower structure of the dynamic motorcycle 4-cycle engines.

  As described above, according to the lower structure of the four-cycle engine of the present invention, when replacing the oil filter and the oil cooler, the detachable tool can be routed without interfering with the exhaust pipe. Workability can be improved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 6 show an example of an embodiment of a lower structure of a four-cycle engine for a motorcycle according to the present invention. FIG. 1 is a side view of the motorcycle according to the embodiment, and FIG. 3 is a detailed front view of the engine, FIG. 4 is a left side view of the engine, FIG. 5 is a front view of the engine of Modification 1, and FIG. 6 is a front view of the engine of Modification 2. .

  As shown in FIGS. 1 and 2, the motorcycle according to the embodiment includes an engine (a four-cycle parallel four-cylinder engine) 10 having a crankshaft arranged in the vehicle body width direction between a front wheel 12 and a rear wheel 14. Mounted on the front lower part of the car body.

  The engine 10 is suspended from a frame 16, and a head pipe (steering head pipe) 16 a that rotatably supports a steering hawk 18 (for front wheel 12 shaft support) is provided at the front end of the frame 16. A main tube 16b having a pivot shaft 22 (supporting the rear swing arm 20 for supporting the rear wheel) is provided at the rear end.

The frame 16 is a twin tube type frame in which a tank tube 24 made of an aluminum square pipe having a rectangular cross section extends obliquely downward and rearward from the head pipe 16a. A fuel tank 24a is mounted on the tank tube 24. It is fixed.
A seat rail 26 extends obliquely upward and rearward from the upper rear side of the main tube 16b, and a seat 28 is disposed thereon.

The fairing 30 covering the motorcycle has a substantially bullet-like shape as a whole extending from the periphery of the front steering above the front wheel 12 to the vicinity of the main tube 16b while covering the engine 10 with the engine 10 suspended on the frame 16. Like the structure, it is formed in a shape that reduces air resistance during travel.
The fairing 30 has an insertion hole 30a that exposes the magneto cover portion of the engine case 10a as close as possible to the vicinity of the vehicle body, and also has ventilation windows 30b on the front and side surfaces to ensure ventilation performance. Yes.
Note that a side stand (prop stand) 54 is pivotally supported at the lower end of the left side of the main tube 16b so as to be held in and out by a spring.

As shown in FIGS. 3 to 4, in the engine 10, an exhaust pipe (exhaust pipe) 32 is connected to an exhaust port 34 at the upper front of the engine for each of the four cylinders (# 1 to # 4). 10 extends downward from the front, bends in a generally L shape along the lower front of the engine, and extends rearward.
Exhaust pipe 32 is assembled with the engine 10 downward (collecting portion 36a), is connected from there to the muffler 36b disposed on the rear portion of the vehicle body.

As a cooling system for the engine 10, a radiator 38 is provided in front of the engine 10, and a water pump 40 is disposed in the lower rear portion of the engine 10 . Inlet 40a of the water pump 40 of that communicates with the outlet 38a of the radiator 38 with the suction side of the water hose (cooling water hose) 42a through the lower left side of the engine 10.

  One of the inlets 38b of the radiator 38 is connected to a water-cooled oil cooler 44, which will be described later, via a water hose 42b. The oil cooler 44 communicates with a discharge port 40b of the water pump 40 via a water hose 42c. .

The other inlet 38c of the radiator 38 is connected to the cylinder head 10b of the engine 10 via a water hose 42d, and the cylinder block 10c communicates with the discharge port 40c of the water pump 40 via a water hose 42e.
A reservoir tank 46 for storing cooling water is provided above the water pump 40.

In the engine case 10a at the lower part of the engine 10, the bottom oil pan 48 is protruded downward and both sides thereof are formed into inclined surface (48a, 48a) shapes, and are formed in a mountain shape substantially downward in front view.
At the same time, the exhaust pipes (exhaust pipes) 32 to 32 of the four (# 1 to # 4 cylinders) are distributed to the left and right along the inclined surfaces 48a and 48a, respectively. The engine 10 is provided with gaps 50a, 50b between the exhaust pipes 32, 32 of the # 2 and # 3 cylinders and between the exhaust pipes 32, 32 of the # 1, # 2 cylinders, respectively, and facing rearward. It is.

Then, a substantially cylindrical oil filter 52 and an oil cooler 44 are protruded forward at the lower part of the front surface of the engine case 10a of the engine 10 and arranged side by side in the vehicle width direction right and left, respectively.
The oil filter 52 is a container having a filter body accommodated in an outer case, and the oil passage is connected to the engine case 10a side (not shown).

Here, as shown in FIG. 3, the oil cooler 44 has fastening portions 60 to 60 for fastening bolts at four locations, and these fastening portions 60 to 60 are provided on the left and right side portions of the oil cooler 44 in a front view. It has two places.
And at least in front of the center part 52a of the oil filter 52 and the inner fastening part of the oil cooler 44, the gaps 50a and 50b between the exhaust pipes 32 to 32 are arranged to form the exhaust pipes 32 to 32. Is.

  According to the embodiment, the oil filter 52 and the oil cooler 44 are juxtaposed at the lower front portion of the engine 10 so as to protrude forward, so that the oil filter 52 and the oil cooler 44 are arranged both in the height direction and in the radial direction. It can be expanded and there is no hindrance to increase its capacity.

  The oil cooler 44 has fastening portions 60 to 60 on both sides when viewed from the front, and the exhaust pipes 32 to 32 are provided at least in front of the center portion 52a of the oil filter 52 and the inner fastening portion 60 of the oil cooler 44. It is assumed that gaps 50a and 50b are arranged between each other.

  That is, since the oil filter 52 and the oil cooler 44 are provided at the lower front part of the engine case 10a of the engine 10 so as to protrude forward, insertion spaces for tools (denoted by reference numeral 62) used when attaching and detaching them are provided for each exhaust. Since it is necessary between the pipes 32 to 32, the gaps 50b and 50a between the exhaust pipes 32 to 32 are disposed in front of the oil filter center 52a and the inner fastening part 60 of the oil cooler 44. .

  In this case, with respect to the oil filter 52, since the tool 62 is put on the oil filter 52 and the tool 62 is rotated to be attached and detached, it is necessary to provide an insertion space for the tool, but the gap 50b is inserted into the oil filter 52. There is a space in which the tool 62 can be inserted.

As for the oil cooler 44, the oil cooler 44 has fastening portions 60 to 60 on both sides when viewed from the front, and the outer fastening portion 60 is a tool (nut wrench or the like) inserted from the side of the engine 10 (left side in the embodiment). ), The inner fastening portion 60 is sandwiched between the oil filter 52 and the oil cooler 44 on both sides, and a tool cannot be inserted from the side of the engine 10.
For this reason, the exhaust pipes 32 and 32 are disposed in front of the inner fastening portion 60 of the oil cooler 44 so that the gap 50a between the exhaust pipes 32 and 32 of the # 2 and # 3 cylinders is located. It is.

  In addition, at least one of the exhaust pipes 32 (in the embodiment, the exhaust pipe 32 of the # 2 cylinder) extends vertically between the center portion 52a of the oil filter 52 and the inner fastening portion 60 of the oil cooler 44. Therefore, regardless of the number of cylinders, the gaps 50b and 50a between the exhaust pipes 32 to 32 are positioned at least in front of the central portion 52a of the oil filter 52 and the inner fastening portion 60 of the oil cooler 44. Exhaust pipes 32 to 32 can be arranged in

Here, in order to increase the capacity of the oil cooler 44 for improving the cooling performance, it is necessary to bring the oil cooler 44 close to the full width of the engine. Further, it is desirable that the water hose 42a that connects the radiator 38 and the water pump 40 be disposed closer to the inner side (closer to the oil cooler 44) in order to increase the bank angle.
As a result, the water hose 42a can be brought close to the oil cooler 44. Therefore, as shown in FIG. 3, the water hose 42a is arranged close to the outer side in the vehicle width direction of the oil cooler 44, and the water hose 42a is viewed from the front. The oil cooler outer fastening portions 60 and 60 are provided by being offset vertically by sandwiching them, and a space for detachment work can be secured by inserting a tool.

In Modification 1 of FIG. 5, a gap 50 c is provided so that the exhaust pipes 32, 32 of the # 3 and # 4 cylinders are brought close to each other so that the outer fastening portion 60 of the oil cooler 44 can be seen from the front. In Modification 2 of FIG. 6, a gap 50 c is provided so that the exhaust pipe 32 of the # 4 cylinder is moved away from the oil cooler 44 so that the outer fastening portion 60 of the oil cooler 44 can be seen from the front.
According to these modified examples, the exhaust pipes 32 and 32 (# 3, # 4) are disposed in the outer fastening portion 60 of the oil cooler 44 as well as in front of the center portion 52a of the oil filter 52 and the inner fastening portion 60 of the oil cooler 44. Exhaust pipes 32, 32 are formed and arranged so that the gap 50c is located, and a tool may be inserted using the gap (gap) 50c.
Thereby, since the tool 62 can be inserted into all the fastening portions 60 from the front, the workability can be further improved.

  The oil filter mounting structure of the four-cycle engine of the present invention is not limited to the above-described embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a motorcycle as an example of an embodiment for implementing a lower structure of a four-cycle engine for a motorcycle according to the present invention. Fig. 2 is a front view of the motorcycle. It is a detailed front view of an engine. It is a left side view of an engine. It is a front view of the engine of the modification 1. FIG. 11 is a front view of an engine of a second modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Engine 10a Engine case 10b Cylinder head 10c Cylinder block 12 Front wheel 14 Rear wheel 16 Frame 22 Tank tube 24a Fuel tank 30 Fairing 30a Insertion hole 30b Ventilation window 32, 32 Exhaust pipe (exhaust pipe)
34 Exhaust port 36a Collecting part 36b Muffler 38 Radiator 38a Inlet 40 Water pumps 42a to 42e Water hose 44 Oil cooler 46 Reserve tank 48 Oil pan 48a Oil pan inclined surfaces 50a to 50c Clearance 52 between exhaust pipes Oil filter 52a Center of oil filter Part

Claims (2)

A parallel 4-cylinder engine with a crankshaft arranged in the width direction of the car body is mounted on the lower front side of the motorcycle.
A radiator provided in front of the engine is connected to a water pump disposed at the rear of the engine with a water hose passing through the engine side,
The exhaust pipe of the engine is connected to the exhaust port at the upper front of the engine provided for each of the four cylinders at the rear of the radiator and extends from the front of the engine to the lower side of the engine, and then gathers under the engine. Connected to the muffler located at the rear of the car body,
In the lower structure of a four-cycle engine for a motorcycle provided with an oil cooler and an oil filter in front of the engine behind the exhaust pipe,
The exhaust pipe is bent in a generally L shape along the lower front part of the engine and extends rearward to be gathered below the engine,
The engine oil pan projects downward and is arranged close to the exhaust pipe and attached to the bottom of the engine case at the bottom of the engine,
The oil cooler and the oil filter are juxtaposed side by side to project forward from the front of the engine case adjacent to the oil pan,
The exhaust pipe is provided with a gap formed between the exhaust pipes of the four cylinders, and a fastening portion faces the gap of the exhaust pipe so that the oil cooler can be attached and detached with a tool inserted from the gap of the exhaust pipe. A substructure of a four-cycle engine for a motorcycle, characterized by being provided. A parallel four-cylinder engine with a crankshaft arranged in the vehicle body width direction is mounted on the lower front side of the motorcycle, and a water hose passes through the engine side to a water pump located at the rear of the engine. After connecting the engine exhaust pipe to the exhaust port at the upper front of the engine provided for each of the four cylinders at the radiator rear position and extending from the front of the engine to the lower side of the engine A lower part of a four-cycle engine for a motorcycle, which is provided below the engine and connected to a muffler disposed at the rear of the vehicle body, and in which an oil cooler and an oil filter are provided in front of the engine behind the exhaust pipe In structure
The exhaust pipe is bent in a generally L shape along the lower front part of the engine and extends rearward to be gathered below the engine,
An oil pan of the engine is disposed along the exhaust pipe so as to protrude downward and attached to the bottom of the engine case below the engine,
The oil cooler and the oil filter are juxtaposed side by side to protrude forward on the front surface of the engine case,
The oil filter has a substantially cylindrical shape when viewed from the front, and is formed to be detachable by rotating around the center of the oil filter, while the oil cooler is a fastening portion to the engine case at the outer periphery on both the left and right sides in the vehicle width direction when viewed from the front. With
Between each of the exhaust pipes provided for each of the four cylinders extending in front of the engine case and in front of the oil filter and the oil cooler, to the oil filter center portion of the oil filter and the fastening portion of the oil cooler . A lower structure of a four-cycle engine for a motorcycle, wherein a gap is formed through which a detachable tool can be inserted from the front.

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