JPS6241156B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine cooling device for a motorcycle having a water-cooled engine mounted on the vehicle body.

In such conventional engine cooling systems, the radiator that communicates with the engine's water jacket is installed in the front of the engine, so the radiator can prevent drafts around the engine to some extent, and
Since the engine is affected by hot air that has passed through the radiator, it has a disadvantage that the air cooling effect of the engine is poor.

The present invention has been proposed in view of the above, and an object of the present invention is to provide an engine cooling device for the motorcycle, which has a simple structure and can eliminate the above-mentioned drawbacks of conventional devices. A ventilation duct that also serves as a seat cowl that covers the rear end is arranged in series, and the duct is arranged so that the running wind that flows along the back of the driver who leans forward on the seat while driving can blow through the ventilation duct. An inlet is opened on the top surface and an outlet is opened on the rear surface, and a radiator that communicates with the water jacket of the engine is installed in the ventilation duct.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A motorcycle M includes a vehicle body B, a front fork Ff which is connected by fitting a steering shaft 2 into a head pipe 1 at its front end and supports a front wheel Wf at its lower end, and a vehicle body. The main components are an engine E mounted on the vehicle B, and a rear fork Rf that is pivotally supported by the engine E so as to be vertically swingable and that pivotally supports the rear wheel Wr at its rear free end.

The vehicle body B is divided into a thin plate cowling 3 whose front end is fixed to the head pipe 1 and extends rearward and downward, and a seat frame 6 which is fixed to the rear end of the engine E. The cowling 3 is made of light alloy or synthetic material. Formed into a streamlined shell from lightweight materials such as resin,
An air inlet 4 is provided on the front surface, and an air outlet 5 is provided on the rear surface. The engine E is housed inside the cowling 3, and the left and right side plates of the cowling 3 are used for the engine E.
The rigidity of the cowling 3 is strengthened by tightening bolts 7, 7, . . . on the left and right side walls of the cowling 3. On the other hand, a seat 6a for the operator D is provided on the upper surface of the seat frame 6.
Further, a fuel tank 8 is installed over the cowling 3 and the seat frame 6.

The engine E has a crankcase 9 and two cylinder blocks 10 and 10' that protrude from the front part of the case in a V-shape.
It is pivoted so that it can swing up and down. A suspension spring device S is provided between the rear fork Rf and the upper end of the engine E to suspend the rear fork Rf in a cushioning manner, and the shock absorber is designated by the reference numeral 12.

Output shaft 13 of engine E is coaxial with axis 11
is arranged, and the rotational force of this output shaft 13 is
A drive sprocket 14 fixed to the shaft 13, a chain 15, and a driven sprocket 1 provided on the rear wheel Wr.
6 and drives the rear wheel Wr. Output shaft 13
The reason why the rear fork Rf and the pivot shaft 11 of the rear fork Rf are arranged coaxially is to prevent tension or relaxation from being applied to the chain 15 when the rear fork Rf swings up and down.

A ventilation duct 17 is connected to the rear end of the seat frame 6, through which the wind flowing vigorously along the back of the driver D who leans forward on the seat 6a while the vehicle is running passes through. is sheet 6
It is formed to cover the rear part of the seat cowl and constitutes a seat cowl.

A step bracket 21 is fixed to the engine E and has a rod-shaped step 22 at its rear end.

A radiator R is installed in the ventilation duct 17, and a hose 2 is connected between the radiator R and the water jacket of the engine E so that cooling water can be circulated.
Connect 0,20'.

The ventilation duct 17 has an inlet 18 on its upper surface,
An outlet 19 is opened at the rear surface, and as a result, while the vehicle is running, the traveling wind flowing down at high speed along the back of the driver D who takes a forward leaning posture blows through the inside of the ventilation duct 17 with force. , a large amount of cooling air can be supplied to the radiator R, and it can be effectively cooled.

Furthermore, in the embodiment shown in FIGS. 1 to 4, in order to increase the amount of ventilation to the radiator R,
Parts of the left and right side plates of the ventilation duct 17 are bulged outward in front of the ventilation duct 17, and an additional running air opening 23 is formed in the front of these bulges 17a.

5 to 7 show another embodiment of the ventilation duct 17, in which the ventilation duct 17 is an upper duct half 17.
A and a lower duct half 17B, and a supporting rib 2 protrudes from the upper inner side of the lower duct half 17B.
Place the radiator R on 4 and 24. The upper duct half 17A has a presser piece 25 formed inside thereof,
25'... are fitted onto the outer periphery of the lower duct half 17B so as to hold the radiator R, and screws 26, 26... are fitted onto the outer periphery of the lower duct half 17B
is combined with At that time, an elastic member 27 such as rubber is wrapped around the outer periphery of the radiator R, and hook pieces 28 and 29 are attached to the opposing sides of the radiator R and the lower duct half 17B as shown in FIG. If the radiator R is elastically held on the support rib 24 by stretching a rubber band 30 over the support rib 24, a vibration-proofing effect of the radiator R can be obtained.

Next, the procedure for assembling the motorcycle M of the present invention will be explained mainly with reference to FIG. 3. First, the front wheel Wf is attached to the front fork Ff, and its steering shaft 2 is inserted into the head pipe 1 of the cowling 3 to assemble the front half of the vehicle. . On the other hand, a ventilation duct 17 connects the rear fork Rf with the rear wheel Wf attached to the engine E, and also includes a seat cowl, that is, a radiator R.
Fix the seat frame 6 to the engine E, and connect the hose 2 between the engine E and the radiator R.
0 and 20' to assemble the rear half of the vehicle, and then insert the engine E into the cowling 3 from the rear end and secure them together with bolts 7, 7, etc. to assemble both halves of the vehicle. Finally, the fuel tank 8 is attached to the fixed position.

Decomposition may be performed in the reverse manner to the above.

As described above, according to the present invention, at the rear of the vehicle body,
A ventilation duct that also serves as a seat cowl that covers the rear end of the seat is installed in series so that the running wind that flows along the back of the driver who leans forward on the seat while driving passes through the ventilation duct. An inlet is opened on the top surface of the duct, and an outlet is opened on the rear surface of the duct, and a radiator that communicates with the water jacket of the engine is installed inside the ventilation duct.The radiator is located behind the seat and away from the engine. This eliminates the conventional problem of the radiator blocking the air cooling effect of the engine, and when the vehicle is running, the running air that flows down at high speed along the back of the driver who leans forward can be used as a ventilation source. Since it blows through the duct with great force, a large amount of cooling air can always be efficiently supplied to the radiator without using forced air means.As a result, the engine can be effectively cooled by two methods: water cooling and air cooling. The cooling performance can be greatly improved. Furthermore, since the ventilation duct is also used as a seat cowl, the structure is simple and can contribute to cost reduction.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is an overall side view of the motorcycle, FIG. 2 is a plan view thereof,
Figure 3 is a side view of the front and rear parts of the motorcycle in the assembly process, Figure 4 is a perspective view of the seat frame with the seat and ventilation duct attached, and Figure 5 is a side view showing another embodiment of the ventilation duct. 6 is a longitudinal sectional side view thereof, FIG. 7 is a sectional view taken along the line -- in FIG. 5, and FIG. 8 is a partially enlarged sectional view of the ventilation duct showing a specific example of the radiator support structure. B... Vehicle body, E... Engine, M... Motorcycle, R... Radiator, 17... Ventilation duct, 1
7A... Upper duct half, 17B... Lower duct half, 18... Inlet, 19... Outlet.

Claims (1)

[Scope of Claims] 1. In an engine cooling system for a motorcycle equipped with a water-cooled engine mounted on the vehicle body, a ventilation duct that also serves as a seat cowl that covers the rear end of the seat is connected to the rear of the vehicle body, and An inlet is opened on the top surface of the duct and an outlet is opened on the rear surface thereof, so that the traveling wind flowing along the back of the driver who leans forward on the seat blows through the ventilation duct. An engine cooling device for a motorcycle, comprising a radiator installed therein that communicates with a water jacket of the engine. 2. An engine cooling system for a motorcycle according to claim 1, wherein the duct is composed of two duct halves that are separably connected to each other, and the radiator is sandwiched between the duct halves. Cooling system.