JPS6347619Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooling device for cooling a water-cooled engine mounted on a vehicle such as a snowmobile.

Generally, a cooling device for a water-cooled engine circulates cooling water through a radiator and blows air through the radiator to cool the cooling water. Conventionally, in this cooling system, when air is blown using only the running wind that accompanies the vehicle running, there is a drawback that when the vehicle is running at low speed, the radiator acts as ventilation resistance and air cannot be blown sufficiently, resulting in insufficient cooling. If you enlarge the area of the radiator to solve this problem, it will become overcooled when driving at high speeds,
The disadvantage is that heat loss increases, thermal efficiency decreases, and fuel consumption increases.

Therefore, as shown in Japanese Utility Model Application Publication No. 50-48036 or No. 54-6730, forced air from a cooling fan driven by an engine and driving wind have been combined, or the air pressure has been adjusted to match the wind pressure of both. A system has been proposed in which air is switched to the radiator to blow air to the radiator. However, in the above proposed structure where the traveling wind and forced wind are simply combined, there is a drive loss as the forced wind is sent even at high speeds when sufficient air volume can be obtained with just the traveling wind. In a system that switches the speed according to the wind pressure, the wind during low-speed driving is not effectively utilized.

The present invention aims to solve the problem of the above-mentioned problem that the running wind during low-speed driving is not used effectively and that drive loss occurs due to forced airflow during high-speed driving. Introduced into a part of the radiator separately from the passage of
The present invention also provides a cooling device for a water-cooled vehicle engine that shuts off the supply of forced air during high-speed running.

That is, the cooling device for a water-cooled engine for a vehicle according to the present invention blows air into the radiator of a water-cooled engine mounted on a vehicle to cool the circulating cooling water in the radiator, and is designed to cool the circulating cooling water in the radiator. A traveling wind introduction passage that introduces natural wind and sends it to the radiator, a forced air device driven by the engine, and the traveling wind introduction passage are formed separately, and the suction port is connected to the discharge port of the forced air blowing device. A forced air passageway in which a communicating air outlet opens towards a part of the radiator at a position close to the front of the radiator on the lower surface of the running air introduction passage; and forced air passage through the forced air passageway to the radiator when the vehicle is running at high speed. The device is characterized in that it is equipped with an air volume adjusting means for cutting off the supply.

In the above-mentioned water-cooled engine cooling system for vehicles, the forced air is supplied to a part of the radiator at a position close to the front of the radiator, separate from the running air introduction passage, so the forced air flows backward through the running air introduction passage. In addition, even when the vehicle is running at low speed, the wind is directly introduced into the rest of the radiator to which forced air is not supplied.
When the vehicle is running at high speed, the supply of forced air is cut off, so that there is no substantial flow of air in and out of the forced air device, and the driving load is reduced.

Hereinafter, embodiments of the present invention will be described based on the drawings.

<Embodiment 1> As shown in FIGS. 1 to 3, 1 is a snowmobile, 2 is a water-cooled engine mounted on the front part of the vehicle body 3, and 4 is a running wind introduction passage. In the front part, a horizontal partition plate 5 is provided approximately at the center, and the upper part of the partition plate 5 forms a running wind introduction passage 4. The running wind introduction passage 4 is for introducing natural wind during running, and is opened at the front of the vehicle body 3 at the front, while a radiator 6 for cooling the engine 2 is installed at the rear.
is provided, and a plurality of guide vanes 7 are further attached to the front opening.

Further, below the partition plate 5, a flywheel magnetic generator 9 is installed in the crankcase 10 on the crankshaft 8 (drive shaft) of the engine 2, and a starter device is installed in the open end of the crankcase 10. 11 are installed in series. generator 9
The flywheel 12 is fitted and fixed to the shaft end of the crankshaft 8 via the boss member 13, and the magnet 14 is fixed to the inner surface of the outer cylindrical portion 12a of the flywheel 12. A coil 15 is attached to a crankcase 10 via a support member 16, and a flywheel 12 rotates as the crankshaft 8 rotates to generate electricity. In the starter device 11, a recoil cover 17 is integrally fixed to a crank case 10, a rope winding reel 18, a retainer cam 19, a dog (not shown), etc. are housed in the recoil cover 17, and a boss member 13 is attached to a crank case 10. A pulley 20 is fixed to the crankshaft 8, and the crankshaft 8 is started to rotate by engaging the dog with the crank pulley 20.

Furthermore, the generator 9 is integrally provided with a forced air device 21, and the forced air device 21 has a plurality of blades 22 attached to the outer periphery of the flywheel 12, a suction port 23 on the recoil cover 17, and a suction port 23 on the crankcase 10. A discharge port 24 is opened at each of the holes, and air is forcedly blown as the flywheel 12 rotates. Further, a gutter member 25 having a substantially U-shaped cross section is fixed to the lower surface of the partition plate 5 in the left-right direction of the vehicle body to form a forced ventilation passage 26.
An inlet 27 at one end of the radiator 6 is connected to an outlet 24 of the forced air blower 21, and an outlet 28 at the other end is opened in the partition plate 5 at a position close to the front of the radiator 6 on the lower surface of the traveling wind introduction passage 4.

On the other hand, a forced air volume adjusting means 29 is provided between the running wind introduction passage 4 and the forced air blower 21. and are connected by a rod 32. The closing plate 30 has one end pivotally supported by the lower edge of the suction port 23 in the recoil cover 17, and is formed in an arc shape along the outer periphery of the recoil cover 17, and further has a return spring 33 between the end and the recoil cover 17. It is stretched and always biased in the open direction. Traveling wind sensing plate 3
1 is pivotally supported at the front opening of the running wind introduction passage 4 in the front part of the vehicle body 3, and the closing plate 30 opens the suction port 23 when the rear is tilted downward, and when the closing plate 30 rotates to the horizontal position, the closing plate 30 opens the suction port 23. Close the mouth 23.

Next, the effect of blowing air onto the radiator 6 will be explained. First, when the snowmobile 1 is stopped, the running wind is not introduced into the running wind introduction passage 4, so no wind pressure acts on the sensing plate 31, and the spring force of the return spring 33 causes the closing plate 30 to close the suction port 23. At the same time as opening the sensing plate 31, the sensing plate 31 is held in an inclined state. In this state, when the engine 2 is started, the flywheel 12 rotates, the blades 22 rotate, forced air flows through the forced air passage 26, is supplied to the radiator 6 through the air outlet 28, and is fed into the radiator 6. Cool the circulating cooling water.

Subsequently, when the snowmobile 1 travels, wind is introduced and wind pressure acts on the sensing plate 31, but when traveling at low speed, the spring force of the return spring 33 is greater than the wind pressure on the sensing plate 31. Therefore, the suction port 23 remains open (see the solid line in FIG. 1), and both the traveling air and the forced air are supplied to the radiator 6 to cool the cooling water.

Further, when the snowmobile 1 is running at high speed, the wind pressure on the sensing plate 31 increases, and the sensing plate 31
rotates to a substantially horizontal state against the spring force of the return spring 33, and the closing plate 30 closes the suction port 23 (see the chain line in Figure 1), and the supply of forced air is stopped and the traveling wind is Only the coolant is supplied to the radiator 6 to cool the cooling water. Therefore, by closing the suction port 23 with the closing plate 30, suppressing the amount of forced air blown, and reducing the required driving horsepower of the forced air blower 21, it is possible to reduce the fuel consumption of the vehicle. That is, as shown by the broken line in FIG. 6, the driving force of the forced air blower 2 changes depending on the degree of opening (air volume) of the closing plate 30, and the driving force changes when the closing plate 30 is fully closed, that is, when driving at high speed. becomes smaller.

In addition, the forced wind is also supplied to the magnet 14,
The magnet 14 is also cooled.

<Embodiment 2> In this embodiment, as shown in FIG. 4, the air volume adjusting means 34 opens and closes the air outlet 28 of the forced air passage 26.

The air volume adjustment means 34 has one end of a closing plate 35 rotatably supported on the front edge of the air outlet 28 in the partition plate 5, and a return spring 36 is stretched between the closing plate 35 and the partition plate 5. The occluding plate 35
is constructed such that it is always biased in the opening direction.

Therefore, when the snowmobile 1 is stopped or running at low speed, the wind pressure of the traveling wind does not act on the closing plate 35, or even if it does, it is smaller than the spring force of the return spring 36, so that the closing plate 35 closes the air outlet. 28 is held in an upright position with open position (4th
(see the solid line in the figure), the radiator 6 is supplied with both forced wind and running wind. Also, when traveling at high speed, the wind pressure of the traveling wind becomes greater than the spring force of the return spring 36, and the closing plate 35 closes the air outlet 28 (see Fig. 4), so that only the traveling wind flows through the radiator 6.
is supplied to In the case of this example, the driving force of the forced air blower 21 has the characteristics shown by the solid line in FIG. 6, and the decrease in the driving force when the closing plate 35 is closed is slightly smaller than in the first embodiment. The other configurations and functions are the same as in the first embodiment.

In addition, in the second embodiment, the return spring 3
6 may not be provided, and the closing plate 35 may be opened and closed depending on the balance between the wind pressures of the traveling wind and the forced wind.

<Example 3> As shown in FIG. 5, in this example, a closing plate 30 for opening and closing the suction port 23 of Example 1 and a closing plate 30 for opening and closing the air outlet 28 of Example 2 are used as the air volume adjusting means 37. The block plate 35 is connected to the plate 35 by a rod 32, and the block plate 35 is used as a wind-sensing plate, and other configurations and functions are the same as those of the first or second embodiment. .

Therefore, the outlet side blocking plate 35 (driving wind sensing plate)
The suction side closing plate 30 is opened and closed in conjunction with the opening and closing of the
This is to adjust the forced air volume.

Further, although the first to third embodiments above have been described with respect to the snowmobile 1, the present invention can be applied to various vehicles equipped with a water-cooled engine.

As described above, according to the present invention, the running wind introduction passage and the forced air passage are formed separately, and forced air is supplied to a part of the radiator at a position adjacent to the front of the radiator separately from the running wind introduction passage. This prevents the forced wind from flowing backward through the running wind introduction passage, and also allows the running wind to be directly introduced into the rest of the radiator to which forced wind is not supplied even when the vehicle is running at low speeds. When driving at low speeds, both forced air and running air can be used effectively to cool the cooling water efficiently with less engine power.Furthermore, when driving at high speeds, the drive load on the forced air system is reduced, improving fuel efficiency. It is something that can be achieved.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIGS. 1 to 3 show Embodiment 1, in which FIG. 1 is a partially omitted vertical sectional view of a snowmobile, FIG. 2 is a front sectional view of the same, FIG. 3 is an enlarged sectional view of part A in FIG. 2, FIG. 4 is a partially omitted longitudinal sectional view of a snowmobile showing Embodiment 2, and FIG. 5 is a partially omitted longitudinal sectional view of a snowmobile showing Embodiment 3. 6 are characteristic diagrams showing the relationship between the driving force of the forced air blower and the opening degree of the closing plate. 1...Snowmobile, 2...Water-cooled engine, 3...Vehicle body, 4...Travel wind introduction passage, 6...
Radiator, 9... Flywheel magnetic generator, 11... Starter device, 21... Forced air blower, 22... Blade, 23... Suction port, 2
4...Discharge port, 26...Forced air passage, 27...
Suction port, 28... Outlet port, 29, 34, 37...
Air volume adjustment means, 30, 35...Closing plate, 31...
Traveling wind sensing plate, 32... Rod, 33, 36...
return spring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a cooling device for a water-cooled engine for a vehicle, which blows air into a cooling radiator of a water-cooled engine mounted on a vehicle to cool circulating cooling water within the radiator. a traveling wind introduction passage that introduces natural wind accompanying the running of the vehicle and sends it to the radiator; a forced air blower driven by the engine; and a forced air blower which is formed separately from the traveling wind introduction passage and has an inlet. a forced air passageway that communicates with the outlet of the vehicle and has an outlet opening towards a part of the radiator at a position close to the front of the radiator on the lower surface of the running air introduction passage; 1. A cooling device for a water-cooled vehicle engine, comprising an air volume adjusting means for cutting off the supply of forced air. (2) In the air volume adjustment means, a blocking plate that opens and closes the suction port of the forced air blower and a traveling wind sensing plate pivotally supported in the traveling wind introduction passage are linked via a rod, and the closing plate A cooling device for a water-cooled engine for a vehicle according to claim 1, wherein the return spring is always biased in the opening direction, and the closing plate closes the suction port when the vehicle is running at high speed. (3) The air volume adjustment means includes a blocking plate that opens and closes the air outlet of the forced air blower, which is pivotally supported in the running air introduction passage;
The water cooling for a vehicle according to claim 1, wherein the closing plate is always urged in the opening direction by a return spring, and when the vehicle is running at high speed, the running wind presses the closing plate and closes the air outlet. Cooling system for type engine.