JPH0353158B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a radiator for a motorcycle.

2. Description of the Related Art Among motorcycles equipped with a water-cooled engine, it is known that the radiator is mounted toward the front of the vehicle body. On the other hand, in this type of radiator, in those in which tanks are provided at the upper and lower portions of the radiator core, an engine cooling water inlet is provided on the upper surface of the upper tank. This inlet is often provided at the top position when the side stand is used, that is, at the end opposite to the side stand, in consideration of water injection when the side stand is used and air removal from the upper tank.

However, when using the center stand, the car body stands up almost vertically, so the top surface of the upper tank also becomes almost horizontal, which makes it difficult for the air in the upper tank to gather at the inlet when injecting cooling water, making it difficult for air to escape. This results in inconveniences such as poor water flow and requiring time and effort to pour water.

The present invention has been made based on the above circumstances, and even when the radiator is placed approximately horizontally, the air in the upper tank can easily escape, and engine cooling water can be reliably and easily injected. The purpose is to provide radiators for motorcycles.

That is, in order to achieve the above object, the present invention
It is characterized in that the upper surface of the upper tank is sloped upward as it progresses toward the inlet.

The present invention will be explained below based on an embodiment shown in the drawings.

In Figure 1, 1 is the frame as the vehicle body, 2 is the front fork, 3 is the fuel tank, 4 is the seat, 5
indicate the swing arms. For example, a water-cooled 4-stroke V-type 4-cylinder engine 7 is mounted on the left and right down tubes 6, 6 constituting the frame 1, and a water-cooled 4-cycle V-type 4-cylinder engine 7 is mounted on the down tubes 6, 6. A radiator 8 is attached.

The engine 7 has a front cylinder structure 10 and a rear cylinder structure 11 mounted on a crankcase 9 in a V-shape in the longitudinal direction of the vehicle body, and the crankshaft 12 is disposed horizontally along the left-right direction of the vehicle body. has been done. Carburetors 13 are arranged in the space between the two cylinder structures 10 and 11, and the intake ports of these carburetors 13 are connected to the intake chamber 14. The cylinder blocks 15 and 16 of each cylinder structure 10 and 11 are integrally molded with the crankcase 9, and these cylinder blocks 1
Water jackets 20, 21 surrounding the cylinders 19... are formed in the cylinder heads 17, 18 as well as in the cylinder heads 17, 18. And the top of the water jackets 20, 21 are the hoses 22, 2.
3 to the radiator 8. This radiator 8 has tanks 25 and
26 are connected in series, and the upper tank 25
The hoses 22 and 23 are connected to. The radiator 8 is fixed to the down tubes 6, 6 with the radiator core 24 facing forward of the vehicle body, and an inlet 27 is formed on the upper surface of the upper tank 25. The inlet 27 is located at the end opposite to the side stand 28 provided on the left side of the vehicle body, and when the side stand 28 is in use, it is located at the top of the upper tank 25 based on the inclination of the vehicle body and the radiator 8. There is. The inlet 27 is covered with a closed type radiator cap 29, and a reservoir tank 3 is connected to the radiator cap 29 via an overflow pipe 30.
1 is connected. The reservoir tank 31 receives the overflow of the cooling water from the radiator 8, and constantly stores the cooling water to supplement the cooling water when the liquid cooling water is insufficient. The upper surface of the upper tank 25 is formed into an inclined surface 32 that is inclined upward from the left end to the right end, that is, from the side stand 28 side to the inlet 27 side. Even when the vehicle body stands up substantially vertically and the radiator 8 is placed horizontally as in use, the upper surface of the upper tank 25 is kept inclined upward toward the inlet 27 side. .

On the other hand, the lower tank 26 is communicated through a hose 34 to a thermostat accommodating portion 35 formed in the crankcase 9, and the thermostat 36 is housed in the accommodating portion 35. The thermostat accommodating portion 35 is communicated with a water pump 37. An impeller 40 driven by a pump shaft 39 is accommodated in a pump chamber 38 of the water pump 37, and a thermostat housing portion 35 is communicated with a suction port 41 of the pump chamber 38. The outlet 42 is connected to the water jackets 20, 21 of both cylinder structures 10, 11.
It is connected to. That is, as shown in FIGS. 2 and 5, a first
A distribution chamber 45 is formed by overlapping a cover 43 and a second cover 44. This distribution chamber 45 is connected to the discharge port 42 through a passage 46 formed in the crankcase 9, and is connected to both cylinder structures 1 through distribution passages 47 and 48 also formed in the crankcase 9.
0 and 11 are connected to water jackets 20 and 21. Therefore, the cooling water pumped from the discharge port 42 of the water pump 37 is once guided into the distribution chamber 45 as shown by the arrow in FIG.
From there, it is sent to the respective water jackets 20, 21 via distribution channels 47, 48. Note that reference numeral 62 indicates a bypass pipe that connects the upper tank 25 and the water pump 37 by bypassing the thermostat 36.

On the other hand, inner walls 49 and 50 are formed on the inner surfaces of the first cover 43 and the second cover 44. The inner walls 49 and 50 are brought into contact with each other to form a blow-by gas introduction chamber 51 in the distribution chamber 47 that is partitioned and independent from the distribution chamber 47. Channel 5
2 and communicates with the inside of the crankcase 9 through the fifth
Crank case 9 as shown by the dashed arrow in the figure.
The blow-by gas inside the tank is designed to flow in. Further, a connection port 53 connected to the blow-by gas introduction chamber 51 is provided on the upper surface of the first cover 43, and a return pipe 54 is branched and connected to the connection port 53. The return pipe 54 is guided upward between the two cylinder structures 10 and 11 and connected to the intake chamber 14.

Further, an oil passage 55 is formed in the wall portions of the inner walls 49 and 50, and extends in the vertical direction.
It communicates with an oil delivery path 57 formed in 6. The oil that lubricates the crankshaft 12 is pumped into the oil passage 55 as shown by the solid line arrow in FIG.
The oil led into the delivery pipe 58,
It is distributed through 59 to the front cylinder structure 10 side and the rear cylinder structure 11 side, and is designed to lubricate the camshafts 60 (only one of which is shown) of the respective cylinder structures 10 and 11. Therefore,
On the crankcase 9, a part of the circulation path for cooling water, blow-by gas, and oil is integrated and concentrated by simply a pair of covers 43 and 44, and is formed by piping, etc. The simplification is aimed at.

The bottom surface of the blow-by gas introduction chamber 51 and the inside of the crankcase 9 are communicated through an oil return passage 61, and the oil that has flowed into the blow-by gas introduction chamber 51 mixed with the blow-by gas is returned to the crank case 9 through this return passage 61. brought back inside.

According to an embodiment of such a configuration, the engine 7
When the coolant temperature is low, such as immediately after starting the engine, the thermostat 36 closes most of the communication path between the radiator 8 and the foot pump 37, so the coolant does not pass through the radiator 8. It is circulated through the bypass hose 62. When the coolant temperature exceeds a preset value, the thermostat 36 is operated to open the communication passage, and the coolant is circulated through the radiator 8, so that the engine 7 is water-cooled.

By the way, when injecting cooling water from the inlet 27 while using the side stand 28, since the inlet 27 is provided at the right end on the opposite side from the side stand 28, the upper tank 25 of the radiator 8 is As it advances toward the inlet 27, it slopes upward, so the inlet 27 is located at the top, and the air in the radiator 8 flows through the inlet 2.
It becomes easier to gather at 7. This allows air to escape easily, making it easier to pour water. On the other hand, even when performing injection work with the radiator 8 placed approximately horizontally, such as when the center stand 33 is used, as the upper surface of the upper tank 25 moves toward the injection port 27, the upward direction Since the upper tank 25 is provided with an inclined surface 32, the air in the upper tank 25 tends to gather toward the inlet 27 based on the above-mentioned inclination, similarly to when the side stand 28 is used. Therefore, air escape is improved, and water injection work can be performed reliably and easily within a short time.

In addition, as in this embodiment, the radiator cap 29
In the case where the reservoir tank 31 is connected to the reservoir tank 31, there is an advantage that the air in the upper tank 25 easily escapes to the reservoir tank 31 side when the cooling water overflows.

In the above-mentioned embodiment, the engine is a 4-stroke V-type 4-cylinder engine, but the engine type is not limited to this, and the radiator can be installed not only in front of the engine, but also in front of the fuel tank or front fork, for example. It's okay.

According to the present invention described in detail above, the upper tank constituting the radiator is provided with an inlet located at the end opposite to the side stand, and the upper tank is provided with an inlet located at the end opposite to the side stand. Even when injecting cooling water with the radiator placed horizontally, such as when using the center stand, the top surface of the upper tank is slanted in the above direction, making it difficult to inject water. Air expelled to the upper tank side tends to collect on the inlet side.
Therefore, there is an advantage that air escape is improved and water injection work can be carried out reliably and easily in a short period of time.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of a motorcycle, Figs. 2 and 3 are explanatory diagrams showing flow paths of cooling water, and Fig. 4 is a front view of a radiator. Figure 5 is an explanatory diagram showing the flow paths of blow-by gas and oil, and Figure 6 is a diagram showing the flow paths of blow-by gas and oil.
7 is a plan view of the second cover, and FIG. 8 is a plan view of the first cover. 1...Vehicle body (frame), 8...Radiator, 24...
Radiator core, 25... Upper tank, 26... Lower tank, 27... Inlet, 32... Inclined surface.

Claims (1)

[Claims] 1. In a motorcycle with a radiator mounted toward the front of the vehicle body, the radiator is configured by connecting an upper tank and a lower tank with a radiator core, and the upper tank has a radiator located on the opposite side from the side stand. Provide a cooling water inlet,
A radiator for a motorcycle, characterized in that the upper surface of the upper tank is sloped upward as it advances toward the inlet.