JPS6326256B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water cooling device for a water-cooled engine in a motorcycle, and particularly to an arrangement structure of cooling water pipes.

Recently, as water-cooled engines mounted on motorcycles have become larger and heavier, the frame has been constructed with a pair of left and right side tubes, and the engine is inserted from below between these tubes for easy installation and removal for engine repairs and inspections. However, motorcycles in which the engine is suspended in these side tubes have been proposed.

By the way, this type of water-cooled engine is connected to a cooling water pump or a radiator via a cooling water pipe, and thus the cooling water pipe is routed around the engine. However, if the cooling water pipe is installed so as to protrude outward from the side tube, not only will the cooling water pipe be easily deformed and damaged in the event of a rollover, but the cooling water pipe will not be able to be used when the engine is mounted on or removed from the vehicle body. The pipes get in the way, and these operations must be performed with the cooling water pipes removed, making these operations cumbersome.

This invention was made based on the above circumstances, and by arranging the cooling water pipe inwardly between the left and right side tubes, the cooling water pipe will not be deformed or damaged in the event of a rollover, and the engine will be protected. To provide an engine water cooling device for a motorcycle that facilitates the work by allowing the work to be carried out with the cooling water pipe attached during loading and unloading work.

An embodiment of the present invention will be described below based on the drawings.

In the figure, reference numeral 1 denotes a vehicle body, in which a pair of left and right tank rails 3, 3 and a pair of left and right side tubes 4, 4 are welded to a head pipe 2. A fuel tank 5 is mounted on these tank rails 3, 3 so as to straddle them. An engine 6 is horizontally suspended between the side tubes 4, 4. The engine 6 is, for example, a water-cooled 4-cylinder V-type engine, in which two cylinders 7 are arranged at the front and rear, and the front and rear parts are integrated into a front cylinder group 8 and a rear cylinder group 9, respectively. ing. The front cylinder group 8 and the rear cylinder group 9 are arranged in a V-shape at an angle of about 90 degrees to each other, and are arranged approximately forward and rearward with respect to the vertical direction.
It is tilted at a 45° angle. The intake system of the engine 6 is arranged in a V-shaped space between the front cylinder group 8 and the rear cylinder group 9. That is, 10 is an intake surge tank, and this intake surge tank 10 is arranged in a space formed by recessing the bottom of the fuel tank 5 upward, and in a space sandwiched between tank rails 3, 3. . This intake surge tank 10 has an air cleaner 11 connected to the lower center thereof, and air is drawn into the intake surge tank 10 through this air cleaner 11. and intake surge tank 1
Intake pipes 12 are distributed from 0 to each cylinder 7, and each of these intake pipes 12 is provided with a carburetor 13. Such an engine 6 is configured such that at least the cylinder groups 8 and 9 and the intake system have a width smaller than the width of the separation between the side tubes 4 and 4. The system is configured so that it can be inserted vertically between the side tubes 4. The engine 6 is connected to and supported by the side tubes 4 at a plurality of locations. That is, brackets 14 and 15 are welded to the side tubes 4 and 4, and the engine 6 is removably attached to these brackets 14 and 15 via bolts 16, etc. In this case, of course, a rubber mount 17 is provided. A cooling water pump 19 is disposed at the front end of the crankcase 18 at the bottom of the engine 6, and although not shown, this cooling water pump 19 is driven by a crankshaft. A water supply pipe 20 (a hose may also be used) is led out from this cooling water pump 19, and this water supply pipe 20
is guided into the V-shaped space. In this case, the cooling water pump 19 is located below the side tubes 4, 4, and the V-shaped space is located above the side tubes 4, 4, so the water supply pipe 20 is located below the side tubes 4, 4. This water supply pipe 20 is guided between two points above and below that sandwich the
is guided through the inside of the side tubes 4, 4, as shown in FIG. The water supply pipe 20 is connected to a water supply distribution joint 21 provided within the V-shaped space. The water supply distribution joint 21 communicates with water jackets (not shown) of the front cylinder group 8 and the rear cylinder group 9, respectively. Also, water supply distribution joint 21
A condensate collection joint 22 is provided above. This condensate collection joint 22 is connected to the water jackets of the front cylinder group 8 and the rear cylinder group 9. A condensate pipe (a hose may also be used) 23 is led out from this condensate collection joint 22, and this condensate pipe 23
is connected to the radiator 24. The radiator 24 is removably attached to brackets 25, 25 at the front end portions of the side tubes 4, 4 via bolts 26, and faces forward so as to be easily exposed to the traveling wind. The condensate pipe 23 is also located within the interval between the side tubes 4, 4, and connects the condensate collection joint 22 and the radiator 24.
The piping is installed between two points. A return water pipe 27 is led from the radiator 24,
This return water pipe 27 is connected to the cooling water pump 19. In this case, a heat-responsive on-off valve 28 is interposed between the return water pipe 27 and the cooling water pump 19, and this heat-responsive on-off valve 28 is activated when the cooling water temperature reaches a predetermined value or higher. The reduced water from the radiator 24 is returned to the cooling water pump 19, and when the cooling water temperature is less than the predetermined value, the return flow from the radiator 24 to the cooling water pump 19 is prevented. Further, the condensate collection joint 22 and the cooling water pump 19 are connected by a bypass pipe 29 (a hose may be used) so as to generate a flow that bypasses the radiator 24. This bypass pipe 29 is also arranged in a space sandwiched between the side tubes 4, 4.

In the embodiment with such a configuration, since the cooling water pump 19 is driven while the engine 6 is operating, cooling water is supplied through the water supply pipe 20, and this cooling water is branched at the water supply distribution joint 21. The cylinders are then fed into the water jackets of each of the front row cylinder group 8 and the rear row cylinder group 9, respectively. Therefore, each cylinder 7... is cooled by this cooling water. The cooling water that has removed heat from each cylinder 7 is returned to the condensate collection joint 22 at a high temperature. The condensate joint 22 is distributed to the condensate pipe 23 and the bypass pipe 29, but here, when the engine temperature has not yet risen and the temperature of the condensate rises, such as during warm-up operation immediately after starting the engine, etc. When the water temperature is low, the heat-responsive on-off valve 28 is closed by detecting this water temperature, so the radiator 24
The return water pipe 27 from the cooling water pump 19 to the cooling water pump 19 is closed, so that water does not flow from the condensate pipe 23 to the radiator 24. In this case, bypass pipe 2
9, the condensate is returned to the cooling water pump 19. Therefore, if the engine is cold just after starting, the cooling water pump 19 → water supply pipe → water supply distribution joint 21 → cylinder water jacket → condensate collection joint 22 → bypass pipe 29
→ A circulation path such as a cooling water pump 19 is formed, in which case the cooling water serves to warm the engine rather than cooling it.

When the temperature of the engine 6 rises sufficiently, the temperature of the cooling water rises, so the thermally responsive on-off valve 28 is opened. For this reason, the radiator 24 and the cooling water pump 19
Since the condensate collecting joint 22 is connected to the condensate pipe 23, high-temperature cooling water is sent to the radiator 24. The radiator 24 radiates heat through fins (not shown), and in particular receives wind from the vehicle, so the temperature of the cooling water is lowered and the cooling water is returned to the pump 19 through the water return pipe 27. That is, the cooling water is routed through the pump 19 → water supply pipe 20 → water supply distribution joint 21 → engine water jacket → condensate collection joint 22 → condensate pipe 23
→ radiator 24 → return water pipe 27 → heat-responsive on-off valve 28 → pump 19. Note that at this time, a portion of the cooling water is recirculated through the bypass pipe 29. Therefore, the engine 6 is cooled by such cooling water.

According to the configuration of the above embodiment, the water supply pipe 20,
Since the condensate pipe 23, the return water pipe 27, and the bypass pipe 29 are located inwardly between the side tubes 4, 4, they are protected by the side tubes 4, 4 when the vehicle body 1 rolls over. Therefore, there is less deformation or damage. Moreover, when the engine 6 is taken down from the vehicle body 1 for inspection or repair, or when it is suspended on the vehicle body 1, the cylinder 7 and intake system of the engine 6 are formed to be smaller than the width of the side tubes 4. Therefore, it is possible to pass between these side tubes 4, 4 and move up and down. In this case, the water supply pipe 20, condensate pipe 23, return water pipe 27 and bypass pipe 28
This means that the engine 6 can be raised and lowered while being connected to the engine 6. In other words, each time you install or remove the engine 6, remove each pipe,
Since work such as connection is not required, work efficiency is improved. In this case, by removing the radiator 24 from the brackets 25, 25, the engine 6
This means that it can be attached and detached as one unit.

As detailed above, in this invention, the cooling water pipe connected to the engine is placed inwardly between the pair of left and right side tubes on which the engine is suspended, so that the pipe is protected by the side tubes when the vehicle rolls over. No deformation or damage will occur. Moreover, when attaching or detaching the engine to the side tube, the cooling water pipe does not protrude to the side of the side tube, so the engine can be attached or detached with the coolant pipe still attached to the engine, making assembly easier and improving maintainability. do. Furthermore, since the cooling water pipe does not protrude to the side, the driver's feet do not come into contact with the hot cooling water pipe, and there are also advantages such as an improved appearance.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a side view of a motorcycle, and FIG. 2 being a plan view showing the positional relationship between the side tube and the cooling water system. 1... Vehicle body, 4, 4... Side tube, 6... Engine, 19... Cooling water pump, 20... Water supply pipe,
21... Water distribution joint, 22... Condensate collection joint, 23... Condensate pipe, 24... Radiator,
27... Return water pipe, 28... Heat-responsive shut-off valve, 29...
bypass pipe.

Claims (1)

[Claims] 1. In a motorcycle in which a water-cooled engine is inserted from below between a pair of left and right side tubes and the engine is suspended by these side tubes, the cooling water pipe connected to the engine is inserted between the side tubes. A motorcycle engine water cooling system characterized by piping in both directions.