JPH0814248B2 - Engine cooling system - Google Patents

Description

The present invention relates to an engine cooling device used as various power sources.

(Prior Art and its Problems) Conventionally, in an engine cooling device, as shown in FIG. 4 and FIG.
Since it is transmitted to the cooling fan 16 via the fan belt 19 and rotating, the engine output is partially consumed to drive the cooling fan, and the engine output cannot be used effectively.

Further, in the conventional cooling fan, the shaft output of the engine 3 is transmitted via the pulleys 18, 17 and the belt 19, and the cooling fan 16 and the radiator 1 must be installed on the same line as the engine output shaft because of the configuration. When the cooling fan 16 and the radiator 1 are mounted on a vehicle or a machine, there are many restrictions on the installation layout, and there is a drawback that the restrictions are remarkable especially in a small vehicle or machine.

Further, the cooling fan 16 is attached to the engine 3 with large vibration through the pulleys 18 and 17, and is close to the radiator 1 through the cowl 15, so that the engine 3
There is a risk that the cooling fan 16 may interfere with the cowl 15 and be damaged by the swinging of the.

(Means for Solving Problems) The present invention has been made to eliminate the above-mentioned conventional drawbacks, and therefore, the present invention provides a cooling device for an engine, which is equipped with a radiator such as a radiator, with an annular wall. A cooling fan consisting of a first-stage outer peripheral fan and a second-stage inner peripheral fan, which are coaxially and integrally separated by a space therebetween, is rotatably supported in front of or behind the radiator, and the outer periphery of the first-stage outer peripheral fan is rotatably supported. Portion and the outer side portion are covered with a cowl, whereby a gas guide chamber for guiding a gas flow to the first stage outer peripheral fan is formed by the cowl and the annular wall of the cooling fan, and the gas inlet and Connect the gas outlets to the engine exhaust manifold and silencer respectively, and use the engine's exhaust gas to rotate the first-stage outer fan and circulate the second-stage inner fan to turn outside air into a radiator. I tried to pass it. Thus, it is characterized in that the loss of the engine output is reduced by driving the cooling fan using the energy of the exhaust gas which has not been used for any purpose other than the purpose of increasing the output in the supercharger.

(Operation) Exhaust gas discharged from the engine is guided from the exhaust manifold through the exhaust pipe to the gas inlet of the cowl, and the exhaust energy of the exhaust gas rotates the first stage outer fan. Since the first-stage outer peripheral fan and the second-stage inner peripheral fan are integrally formed coaxially, both the first-stage outer peripheral fan and the second-stage inner peripheral fan rotate at the same speed, and the second-stage inner peripheral fan rotates. The fan sucks the outside air through the radiator by the rotation of the fan, thereby cooling the engine cooling water. Exhaust gas flowing in from the gas inlet of the cowl rotates the first stage outer peripheral fan as described above, then flows from the gas outlet of the cowl through the exhaust pipe into the silencer, is silenced, and is then released into the atmosphere. .

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

1, 2 and 3 show an embodiment of the present invention, in which the same reference numerals as those in FIGS. 4 and 5 designate the same components.

In the illustrated embodiment, a cooling fan F is installed in the rear part of the radiator 1, and the cooling fan F is coaxially integrated with a first-stage outer peripheral fan 5 and a second-stage inner peripheral fan 6 with an annular wall 23 in between. The outer peripheral fan 5 of the first stage and the inner peripheral fan 6 of the second stage co-operate with each other.
Therefore, the boss portion of the cooling fan F is fastened to the shaft 12 erected at the center of the mounting plate 2 with the spacer 13 and the nut 14 via the bearing 22, and the mounting plate 2 is further fastened with the bolts 21 to the radiator 1.
Has been concluded. As a result, the cooling fan F has an integral structure with the radiator 1, but the cooling fan F can freely rotate. Further, as shown in the drawing, a cowl 4 shaped so as to cover the outer peripheral portion and the outer side portion of the first stage outer peripheral fan 5 of the cooling fan F is bolted to the radiator 1 together with the mounting plate 2. As a result, the cowl 4 and the annular wall 23 of the cooling fan F form a gas guide chamber 24 for guiding the gas flow to the first-stage outer peripheral fan 5. As shown in FIG. 2, the gas inlet 11a of the cowl 4 is connected to the exhaust pipe 8
a, 8b and a bellows joint 9 provided for the purpose of vibration isolation, are connected to an exhaust manifold 7 which is an exhaust gas discharge part of the engine, and a gas outlet 11b provided on the opposite side of the gas inlet 11a is It is connected to a silencer 10 via exhaust pipes 8c, 8d and a bellows joint 9 provided for the same purpose.

 Next, a method of operating this device will be described.

The exhaust gas discharged from the engine 3 is guided from the exhaust manifold 7 through the exhaust pipes 8a and 8b to the gas inlet 11a of the cowl 4, and the exhaust energy of the exhaust gas causes the first stage outer peripheral fan 5 to move.
To rotate. Since the first-stage outer peripheral fan 5 and the second-stage inner peripheral fan 6 are formed coaxially and integrally, both the first-stage outer peripheral fan 5 and the second-stage inner peripheral fan 6 rotate at the same speed. The stage inner peripheral fan 6 sucks the outside air through the radiator 1 by the rotation of the fan, thereby cooling the engine cooling water. Therefore, the first stage outer peripheral fan 5 is efficiently rotated by the gas introduced from the gas inlet,
Further, the blades of the second-stage inner peripheral fan 6 are inclined so that the outside air can be efficiently sucked in via the radiator 1. The exhaust gas flowing from the gas inlet 11a of the cowl 4 rotates the first-stage outer peripheral fan 5 as described above, and then flows into the silencer 10 from the gas outlet 11b of the cowl 4 through the exhaust pipes 8c and 8d and is silenced. After being released, it is released into the atmosphere.

In this way, using the exhaust energy of the engine,
The second stage inner peripheral fan 6 that drives the second stage outer peripheral fan 5 and is coaxial
Since the outside air is sucked in through the radiator 1 to cool the engine cooling water, the engine output is not consumed for driving the cooling fan F, and the engine output can be effectively used for that amount.

Further, since the radiator 1 and the cooling fan F are connected to the engine 3 only by the exhaust pipes 8a, 8b, 8c, 8d, the degree of freedom of layout can be increased by changing the connection method of the exhaust pipes. .

Furthermore, since the cooling fan F is separated from the engine 3 and the vibration of the engine is not directly transmitted to the cooling fan F, there is no risk of damage due to contact between the fan and the cowl 4.

In the above embodiment, the cooling fan F is replaced by the radiator 1
Although it is arranged after the radiator 1, it can be arranged before the radiator 1.

(Effect) As described above, according to the present invention, the driving force of the cooling fan is not taken out from the engine output shaft, but is driven by using the energy of the engine exhaust gas. The engine output is not consumed, and the engine output can be effectively used for that amount. Further, since the radiator and the cooling fan are connected to the engine only by the exhaust pipe, the layout of the radiator and the cooling fan with respect to the engine can be freely changed by changing this pipe. Further, since the cooling fan is supported not on the engine side but on the radiator side, there is no possibility that the cooling fan and the cowl come into contact with each other and are damaged.

Further, since the first-stage outer peripheral fan and the second-stage outer peripheral fan are separated by the annular wall sandwiched therebetween, there is no fluid interference with each other, and the cooling fan can be efficiently driven and the cooling action can be performed. it can.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention partially broken away,
FIG. 2 is a schematic system diagram according to an embodiment of the present invention, FIG. 3 is a sectional view taken along the line AA of FIG. 1, FIG. 4 is a perspective view showing an example of a conventional device, and FIG. FIG. 3 is a partial cross-sectional view of the device shown.

Claims (1)

[Claims] Claim: What is claimed is: 1. An engine cooling device including a radiator such as a radiator, wherein a cooling fan including a first-stage outer peripheral fan and a second-stage inner peripheral fan, which are coaxially and integrally formed with an annular wall sandwiched therebetween, is provided. The radiator is rotatably supported in front of or behind the radiator, and the outer peripheral portion and the outer side portion of the first stage outer peripheral fan are covered with a cowl, whereby the outer periphery of the first stage outer periphery fan is surrounded by the cowl and the annular wall of the cooling fan. A gas guide chamber for guiding a gas flow to the fan is formed, and a gas inlet and a gas outlet of the cowl are connected to an engine exhaust manifold and a silencer, respectively, and the exhaust gas of the engine is used to connect the first stage outer peripheral fan. An engine cooling device that rotates and allows outside air to pass through the radiator by the rotation of the second stage inner fan.