JPH0530421U - Cooling fan drive for internal combustion engine - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to reduce the load on the bearings that support the cooling fan and the fan pulley, and to reduce restrictions on the mounting position of the cooling fan. [Structure] A fan shroud 14 having a base portion connected to a radiator 13 side is shortened, and a cooling fan 11 is arranged therein. A shaft 17 of the cooling fan 11 is supported by a bearing 15, and the shaft 17 and the rotating shaft 9 of the fan pulley 6 on the engine 1 side are connected by a flexible tube 18 which is bendable. This reduces the load on the bearing 15 on the fan side. Further, the position of the cooling fan 11 is not restricted by the arrangement of the engine 1 due to the flexible tube 18, and the degree of freedom can be increased.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling fan drive device for an internal combustion engine, which has an improved support part for the cooling fan.

[0002]

[Prior Art]

 In a water-cooled internal combustion engine, a cooling fan is installed in the radiator through which the cooling water flows so as to allow the traveling wind to pass efficiently (see, for example, Japanese Utility Model Publication No. 62-14341). Here, a conventional example of a cooling fan driving device for an internal combustion engine will be described with reference to FIG. Reference numeral 1 is an engine, 2 is a chain cover, and 3 is a crankshaft with its tip protruding from the chain cover 2.

A crank pulley 4 is attached to the tip of the crankshaft 3 with a bolt 5 so as to rotate integrally with the crankshaft 3. A fan pulley 6 is arranged immediately above the crank pulley 4, and is supported by a rotating shaft 9 which is rotatably supported by a bearing 8 mounted on the inner circumference of a protruding portion 7 of the chain cover 2. There is. A fan belt 10 is stretched around the outer circumferences of the crank pulley 4 and the fan pulley 6.

A mounting portion 12 provided at the center of the cooling fan 11 is connected to the tip of the rotary shaft 9. The cooling fan 11 is located inside the tip side of the fan shroud 14 whose base end is attached to one side of the radiator 13, and the suction force of the cooling fan 11 effectively acts on the radiator 13.

In the conventional cooling fan drive device configured as described above, when the engine starts and the crankshaft 3 rotates, the rotational force of the cooling fan 11 is passed through the crank pulley 4, the fan belt 10, and the fan pulley 6. The cooling fan 11 is rotated. When the cooling fan 11 rotates, the traveling wind efficiently passes through the radiator 13 due to the suction force generated thereby, so that heat is exchanged in the radiator 13 and the cooling water of the engine 1 is cooled.

[Problems to be solved by the device]

By operating in this manner, there is no problem in cooling the cooling water, but since the cooling fan 11 is supported on the fan pulley 6 side, it is attached to the rotating shaft 9. Since the total weight of the fan pulley 6 and the cooling fan 11 acts as a load on the bearing 8 via the rotating shaft 9, there is a problem that the life of the bearing 8 is shortened. Therefore, if the bearing 8 is to withstand this load sufficiently, this portion will become large.

On the other hand, it is often the case that the radiator 13 and the cooling fan 11 cannot be brought close to each other due to the layout in the engine room. For this reason, the conventional fan shroud 14 shown in FIG. It should be long enough to cover the entire radiator 13 from the back to the cooling fan 11. As a result, the fan shroud 14 becomes large and the space between the radiator 13 and the cooling fan 11 is wasted.

[0008] Therefore, there is also a method of attaching an electric motor to the cooling fan as an electric cooling fan. In this case, the restrictions on the arrangement of the cooling fan itself are reduced, but it is necessary to install the electric motor. This will increase the complexity of the operation, increase the weight and increase the cost.

[0009] As a prior art, there is JP-B-62-14341, which discloses a support and drive device for a cooling fan of an internal combustion engine. This device is excellent in improving the vibration absorption of the fan, but does not improve the above problems.

The present invention has been made in view of the above problems existing in the prior art, and an object thereof is to reduce a load applied to a bearing that supports a pulley and to reduce restrictions on a mounting position of a cooling fan. It is what

[0011]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention connects a cooling fan to a rotating shaft of a fan pulley that receives a rotational force from an engine crankshaft, and positions the cooling fan in a fan shroud on a radiator side. In the internal combustion engine, a cooling fan support is provided on the fan shroud side, and the cooling fan shaft supported by the support and the fan pulley rotation shaft are connected by a flexible tube that is bendable. It is a thing.

[0012]

[Action]

 With the above configuration, the weight of the cooling fan is on the fan shroud side, and the weight of the fan pulley is on the engine side. Therefore, the weight of the bearing on the cooling fan side is reduced. Also, since a flexible tube is interposed between the bearing and the cooling fan, the vibration of the cooling fan is not directly transmitted to the bearing on the cooling fan side.

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. 1 and FIG. 2 showing the main part thereof. In FIGS. 1 and 2, the same parts as those in FIG. 3 are designated by the same reference numerals. In the present invention, the fan shroud 14 is made shorter than that shown in FIG. 3, and a bearing 15 serving as a support portion of the cooling fan 11 is provided through a metal fitting 16 in the central portion positioned by the stay. .. The bearing 15 supports the shaft 17 of the cooling fan 11. The shaft 17 of the cooling fan 11 and the rotating shaft 9 on the fan pulley 6 side are connected by a flexible tube 18 which can be bent.

In this cooling fan drive device configured as described above, the rotation of the fan pulley 6 is transmitted from the rotary shaft 9 to the fan pulley 11 via the flexible tube 18. This promotes heat exchange in the radiator 13. Since the fan shroud 14 is short and a space can be secured in the rear part of the stay (not shown), the cooling efficiency of the cooling water is improved.

Since the cooling fan 11 is supported by the fan shroud 14 via the shaft 17, the swing of the cooling fan 11 and the swing of the fan shroud 14 are synchronized. As a result, the clearance D, which is the gap between the end of the cooling fan 11 and the fan shroud 14 shown in FIG. 2, can be reduced, and the design efficiency is improved. In the conventional case, the swing of the cooling fan and the swing of the fan shroud are separate, so this clearance D is sufficiently secured to prevent the cooling fan from contacting the fan shroud.

Further, since the cooling fan 11 and the fan pulley 6 are connected by the flexible tube 18 which can be bent, the direction of the cooling fan 11 can be determined regardless of the arrangement of the engine itself. The L dimension between the cooling fan 11 and the engine in 2 can also be freely changed by changing the length of the flexible tube 18.

[0017]

[Effect of the device]

 With the above configuration, the weight of the cooling fan is on the fan shroud side, and the weight of the fan pulley is on the engine side. Since there is a flexible tube between the fans, the vibration of the cooling fan is not directly transmitted to the fan bearing, so the aging of the bearing on the fan side is reduced and the service life is extended. In addition, since the fan shroud and the cooling fan oscillate at the same time, the clearance between the fan shroud and the tip of the cooling fan can be made small and the design efficiency is good.

Further, the position of the cooling fan is not restricted by the position of the fan pulley due to the arrangement of the engine by the flexible tube, and the direction of the cooling fan and the distance to the engine can be freely adjusted.

Further, compared with the electric cooling fan system, the number of parts can be reduced, the cost can be reduced, and the weight can be reduced.

[Brief description of drawings]

FIG. 1 is an overall schematic view showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of FIG.

FIG. 3 is an overall schematic view of a conventional cooling fan driving device.

[Explanation of symbols]

 1 Engine 2 Chain Cover 3 Crank Shaft 6 Fan Pulley 8 Bearing 10 Fan Belt 11 Cooling Fan 13 Radiator 14 Fan Shroud 15 Bearing 16 Metal Fitting 17 Shaft 18 Flexible Tube

Claims (1)

[Scope of utility model registration request] 1. An internal combustion engine in which a cooling fan is coupled to a rotary shaft of a fan pulley that receives a rotational force from a crankshaft of the engine, and the cooling fan is located inside a fan-side shroud on the radiator side. A cooling fan driving device for an internal combustion engine, comprising: a support part for a fan; and a shaft of a cooling fan supported by the support part and a rotation shaft of a fan pulley are connected by a flexible tube that is bendable.