JPS6237937Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cooling fan device for forcing cooling air into a cooling water radiator for an engine mounted on a cab-over type automobile. It is.

[Conventional technology and its problems]

Conventionally, this type of cooling fan was developed in the 1970s, for example.
- As described in Publication No. 4137, a belt that is rotationally driven by a belt that is separate from the belt that transmits the rotation of the crankshaft in the engine from the crankshaft to the engine auxiliary equipment such as the cooling water pump or alternator. There are those that are rotationally driven by an electric motor, but the latter one is driven by an electric motor.
While the relative position of the radiator and cooling fan can be set arbitrarily regardless of the engine, the rotational speed of the cooling fan is always constant regardless of the engine rotational speed, and its cooling capacity is limited even when the engine is under high load.
It is necessary to adapt the system to avoid overheating in a high rotation range, and an electric motor with a corresponding capacity is required, which increases the charging load and eventually increases the size of the alternator and battery. On the other hand, in the case of the former engine-driven type, the rotation speed of the cooling fan increases or decreases in proportion to the engine rotation speed, so the cooling capacity of the cooling fan can be lower than that of the electric motor. On the other hand, separating the belt for transmitting power to the cooling fan from the belt for transmitting power to other engine accessories means that the number of belts increases. Therefore, the structure becomes complicated, the engine becomes larger, and belt inspection becomes more troublesome. Therefore, it is recommended to install the engine and the radiator for the engine in the engine room under the driver's seat. When applied to a so-called cab-over type automobile, the space within the engine room is further reduced, and maintenance and inspection of the engine becomes even more difficult.

In addition, conventional cooling fans are installed directly on the crankshaft of the engine, or
Alternatively, as described in Japanese Utility Model Application Publication No. 54-1744, etc., the cooling fan is directly attached to the shaft of the alternator which is belt-transmitted from the engine crankshaft, or the cooling fan is Similarly, cooling water pumps that are belt-transmitted from the engine crankshaft are also directly attached to the shaft, but when these are applied to the engine of the cab-over type automobile, the following is done. There are problems in the points mentioned above.

In other words, in a cab-over type car, the height of the engine room formed under the driver's seat is limited to a low height, so the engine in a cab-over type car is In some cases, the engine is mounted in the engine room in an inclined position with the cylinder bore axis inclined at an appropriate angle with respect to the vertical line. Because the engine and radiator are located in a low-level engine compartment below the driver's seat, the thermal load on the engine and radiator is greater than in non-cab-over vehicles.

However, since the crankshaft of an engine is located relatively low in the engine, attaching the cooling fan directly to the crankshaft as described above means that the cooling fan is not connected to the radiator. The diameter of the cooling fan is constrained by its relationship with the ground and must be made quite small, making it difficult to provide sufficient cooling for cab-over automobile engines that have a large heat load. It cannot be achieved.

Also, when installing the cooling fan directly to the shaft of the alternator or cooling water pump,
The height of the engine room in a cab-over type car is low as mentioned above, so an alternator or cooling water pump equipped with a cooling fan on the same axis is designed to have a height in the engine room in order to increase the diameter of the cooling fan as much as possible. It is necessary to arrange it at a location approximately in the center of the direction. However, in this configuration, the alternator with a cooling fan or the cooling water pump is located at the front of the engine (the front part of the vehicle on both the left and right sides perpendicular to the axis of the crankshaft), and the alternator with a cooling fan or the cooling water pump is located at the front of the engine (the front part of the car from both the left and right sides perpendicular to the axis of the crankshaft). Since the length in the crankshaft direction becomes longer by the length of the alternator or cooling water pump,
This resulted in an increase in the overall length of the automobile.

The present invention provides a cooling fan device that can solve the above-mentioned problems when a cooling fan is attached to the engine of a cab-over type automobile.

[Means for solving problems]

Therefore, in the present invention, the engine is installed in the engine room formed below the driver's seat in an inclined manner so that the cylinder bore axis is inclined at an appropriate angle with respect to the vertical line when the engine is viewed from the direction of the crankshaft. In a cab-over type vehicle mounted on a vehicle, an alternator and a cooling water pump in the engine are distributed and arranged on one side and the other side parallel to the engine crankshaft across the cylinder bore axis, and the alternator A power transmission belt is wound between the pulley on the shaft and the cooling water pump, and the pulley on the shaft and the crankshaft of the engine. An intermediate pulley is rotatably provided, the intermediate pulley is in contact with a power transmission belt from the crankshaft to the alternator and the cooling water pump, and the intermediate pulley is provided with:
It has a configuration in which a cooling fan is attached to ventilate the radiator for the engine.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In the drawing, 1 is a cab-over type automobile, and an engine 4 is mounted in an engine compartment 3 formed below the driver's seat 2. A radiator 5 for the engine 4 is disposed in the front part of the engine room 3 at approximately the center of the engine room 3 in the height direction.

In this case, the engine 4 is
The engine 4 is mounted in an inclined manner so that the cylinder bore axis A when viewed from the direction of the crankshaft 9 (Fig. 2) is inclined by an appropriate angle θ with respect to the vertical line B, and the engine 4 is equipped with a cooling water pump. 6 and an alternator 7 are disposed on one side and the other side parallel to the crankshaft 9 of the engine 4 across the cylinder bore axis A, and a pulley 10 fitted on the crankshaft 9 is arranged. A pulley 11 fitted to the shaft of the cooling water pump 6 and a pulley 12 fitted to the shaft of the alternator 7 are provided to transmit the rotation of the crankshaft 9 to the cooling water pump 6 and the alternator 7. A V-belt 13 is wrapped around it.

Further, on the front surface of the engine 4, an intermediate shaft 18 supported by a bracket 17 attached to the engine 4 is disposed at a portion between the cooling water pump 6 and the alternator 7, substantially parallel to the crankshaft 9. , an intermediate pulley 20 is rotatably fitted onto the intermediate shaft 18 via a ball bearing 19, etc., and the intermediate pulley 20 is connected to a V-belt for power transmission from the crankshaft 9 to the cooling water pump 6 and alternator 7. 13 from the inside thereof, and this intermediate pulley 20 is provided with a cooling fan 21 for ventilation to the radiator 5.

In addition, the reference numeral 8 in the figure indicates a car cooler compressor, and the car cooler compressor 8
is the pulley 15 on the shaft of the compressor 8
and the V-belt 1 wound between the pulley 14 on the shaft of the crankshaft 9 and the tension pulley 23.
6, power is transmitted from the crankshaft 9. Further, numeral 24 is a car cooler condenser, and 25 is an electric fan for the car cooler condenser 24.

Engine compartment 3 below the driver's seat 2 in the cab-over type automobile 1 shown in FIG.
When the engine 4 and the radiator 5 are installed in the engine 4, the cylinder bore axis A is relative to the vertical line B when the engine 4 is viewed from the direction of the crank axis 9 as shown in FIG. When the cooling water pump 6 and the alternator 7 are installed in an inclined manner so as to be inclined by an appropriate angle θ, the cooling water pump 6 and the alternator 7 are distributed and arranged on one side part parallel to the engine crankshaft and the other side part parallel to the engine crankshaft across the cylinder bore axis A. One of the cooling water pumps 6 is on the ground,
Since the other alternator 7 will be closer to the driver's seat 2, installing the cooling fan 21 for the radiator 5 directly on the shaft of the cooling water pump 6 or the shaft of the alternator 7 will make it easier for the cooling fan 21 to , the cooling fan 21 is shifted downward or upward relative to the radiator 5, and its diameter cannot be increased due to restrictions in relation to the ground or the driver's seat.
Even when the cooling fan 21 is attached to the radiator, the cooling fan 21 is shifted downward (toward the ground) with respect to the radiator, and its diameter cannot be increased due to its relationship with the ground. Furthermore, when the cooling fan 21 is directly attached to the shaft of the cooling water pump 6 or the shaft of the alternator 7, these cooling water pumps 6
Alternatively, in order to increase the diameter of the cooling fan 21 as much as possible, disposing the alternator 7 at a substantially central location in the height direction of the engine room 3 means that the length of the entire engine in the crankshaft direction is longer than the alternator 7. 7 or the length of the cooling water pump 6.

In contrast, in the present invention, the cooling water pump 6 and the alternator 7 are disposed separately on one side of the engine 4 parallel to the crankshaft and the other side, while the cooling water pump 6 and the alternator 7 are disposed on the front side of the engine and , an intermediate pulley 20 is rotatably disposed between the cooling water pump 6 and the alternator 7, and the intermediate pulley 20 is used for transmitting power from the crankshaft 9 to the cooling water pump 6 and the alternator 7. A cooling fan 21 for ventilation to the radiator 5 is provided on the intermediate pulley 20 while contacting the V-belt 13 from the inside thereof. , the cooling water pump 6 and the alternator 7 can be positioned approximately at the center of the radiator 5 in the vertical direction, in other words, approximately at the center of the height of the engine room, so the diameter of the cooling fan 21 can be , can be made sufficiently large and can provide good ventilation of cooling air to the radiator 5. On the other hand, the cooling water pump 6 and the alternator 7 can be mounted on one side of the engine 4 parallel to the crankshaft. By arranging the cooling water pump 6 and the ground side, the cooling water pump 6 and the alternator 7 can overlap the engine 4 in the length direction. Although it can be driven simultaneously with the alternator 7, the overall length of the entire engine in the crankshaft direction can be prevented from increasing by the length of the cooling water pump 6 or the alternator 7.

However, in the case of the configuration of the above embodiment, the intermediate shaft 18
Although the contact angle of the intermediate pulley 20 with the V-belt 13 becomes small, the power required to drive the cooling fan 21 is originally small, so no slip occurs at the contact area between the intermediate pulley 20 and the belt 13. It is obvious to those skilled in the art that a tension pulley is provided between the intermediate pulley 20 and the cooling water pump 6 or the alternator 7 to increase the contact angle.

Note that the intermediate pulley 20 to which the cooling fan 21 is attached may be in contact with the outside of the V-belt 13 for power transmission from the crankshaft 9 to the cooling water pump 6 and the alternator 7; The pulley 20 can also be used as a tension pulley for the V-belt 13.

[Functions and effects of the idea]

As described above, since the present invention has the gist of the configuration described in the claims for utility model registration, it has the functions and effects described below.

In a cab-over type vehicle in which the engine and radiator are located in a low engine compartment below the driver's seat, a cooling fan for forced ventilation of the radiator is driven at the same time as an alternator and a cooling water pump. However, since the cooling fan can be installed at a position approximately in the vertical center of the engine room, and by extension the radiator, and the diameter of the cooling fan can be increased, the cab-over type It is possible to sufficiently and reliably cool the engine, which has a large heat load, in an automobile.

When the cooling fan is driven at the same time as the alternator and the cooling water pump, the alternator and the cooling water pump can overlap the engine in the length direction, so the length of the crankshaft of the entire engine is
By extension, the total length of a cab-over type car is
By increasing the diameter of the cooling fan, lengthening can be reliably avoided.

Power is transmitted from the engine to the cooling fan using power transmission belts from the engine to the cooling water pump and alternator, and only one belt is used to transmit power to the cooling water pump, alternator, and cooling fan. This makes it possible to simplify the structure and increase the space in the engine compartment of a cab-over type vehicle.In addition, the maintenance and inspection of the power transmission to the cooling fan can be replaced with the maintenance and inspection of the power transmission to the cooling water pump. At the same time, it is possible to improve the ease of maintenance and inspection of cab-over type automobile engines.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a cab-over type automobile, Fig. 2 is an enlarged cross-sectional view of Fig. 1, and Fig. 3 is a partially cutaway left side view of Fig. 2. be. 1...cab-over type car, 2...driver seat, 3...engine room, 4...engine, 9
...Crankshaft, A...Cylinder bore axis, 5...
...Radiator, 6...Cooling water pump, 7...Alternator, 10, 11, 12...Pulley, 13...
...V belt, 18... intermediate shaft, 20... intermediate pulley, 21... cooling fan.

Claims (1)

[Scope of utility model registration request] A cabover in which an engine is mounted in an engine room formed below the driver's seat in an inclined manner so that the cylinder bore axis is inclined at an appropriate angle with respect to the vertical line when the engine is viewed from the direction of the crankshaft. In a model automobile, the alternator and cooling water pump in the engine are distributed across the cylinder bore axis between one side and the other side parallel to the crankshaft of the engine, and the pulley and cooling water pump on the alternator shaft While the power transmission belt is wrapped between the pulley on the water pump shaft and the engine crankshaft,
An intermediate pulley is rotatably provided on the front surface of the engine between the alternator and the cooling water pump, and the intermediate pulley is in contact with a power transmission belt from the crankshaft to the alternator and the cooling water pump. A cooling fan device for a cab-over type automobile engine, characterized in that a cooling fan for ventilating a radiator for the engine is attached to the intermediate pulley.