JPH1030437A - Fan mounting structure in radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily cope with the adjustment of looseness of a fan belt by mounting a cover having a ventilating window large by a tip clearance than the vane diameter of a fan fixed integrally with a bracket supporting rotatably a fan to a fan shroud vertically movably adjustably. SOLUTION: A fan 4 in a radiator additionally provided in an engine of a fork lift is rotated through a pulley 7, fan belt 8 and pulley 6 by the rotation of the engine 2 to cool a radiator core 3 with air passing in the core. Then, a cover 11 having a plate-like ventilating window 10 sized larger by a slight tip clearance than the fan is secured fixedly to a bracket 5 supporting rotatably the fan 4 and united with the same. Also, the cover 11 can be adjusted vertically by loosening and moving bolts 14 inserted on bolt inserting holes 13... and slots 12 relative to a fan shroud 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan which is disposed so as to face a radiator core, and the fan is covered with a fan cover having a ventilation window on the opposite side of the radiator core. The present invention relates to a fan mounting structure in a radiator for cooling a radiator core by a flow of suction or discharge air passing through the ventilation window.

[0002]

2. Description of the Related Art In a radiator, a fan belt is used to utilize the rotation of an engine. When the fan belt expands, a slip phenomenon occurs between the fan belt and a pulley, and the rotation of the engine is reduced. Is not efficiently transmitted to the fan. For example, as shown in FIG. 4, the fan 4 is supported so as to be able to move up and down using a long hole 17 formed in the bracket 5 that rotatably supports the fan 4. In the ventilation window 10 formed in the fan cover 18, a chip clearance L having a margin 10a for the moving range of the fan is provided, so that the slack of the fan belt 8 can be adjusted. However, with such a structure, the chip clearance L is increased by the allowances 10a and 10a, which causes a decrease in wind pressure and lowers the ventilation efficiency. Therefore, conventionally, for example,
As described in JP-A-151243, a fan shroud 9 is provided.
Is divided into a fan shroud 9a on the side fixed to the radiator core 3 and a fan shroud 9b on the side floatingly supported with respect to the rotation shaft 4a of the fan 4, and both are connected by a sealing 19. (See FIG. 5).

[0003]

The fan shroud, which is floatingly supported with respect to the rotating shaft and is simply connected to the heater core by sealing, is in an unstable supporting state. If the fan receives vibration, the fan may be damaged by contact with the fan shroud, and the structure for floating support with respect to the rotating shaft becomes complicated and lacks reliability. Also, when the blade diameter is changed, the fan shroud on the floating support side must be newly designed.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a fan mounting structure for a radiator which enables adjustment of a fan belt to be loosened without expanding a chip clearance and facilitates a change in a fan blade diameter. There, the structure is a bracket that rotatably supports a fan arranged to face the radiator core,
A cover having a ventilation window larger by a tip clearance than the blade diameter of the fan is fixedly integrated with the cover such that the ventilation window is coaxial with the rotation axis of the fan, at least on the opposite side of the radiator core from the center of the fan. The cover integrated with the fan and the bracket can be moved and adjusted in the surface direction of the radiator core with respect to the radiator core or a fan shroud fixed to the radiator core so as to cover only the periphery of the fan. It is to attach and fix. And, between the cover and the radiator core or the fan shroud, a movement adjusting mechanism by a combination of a bolt and a long hole is provided, or the cover and the radiator core or the fan shroud are expanded and contracted with flexibility. It is possible to provide a fixing means for connecting the frame and the fan and the shroud so that the fan and the fan shroud can move relatively up and down and lock the fan at an appropriate position. Preferably, the cover has a flat plate shape and is fixed to the fan shroud.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a fan mounting structure in a radiator according to the present invention is applied to an industrial vehicle (forklift) will be described with reference to the drawings. FIG.
Shows a mounting structure of a fan in a radiator attached to an engine incorporated in the counterweight portion of the machine base 1 of the forklift, wherein 2 is an engine, 3 is a radiator core, and 4 is a fan. The fan 4 is rotatably mounted on a bracket 5. The fan 4 includes a pulley 6 fixed to a rotating shaft 4 a of the fan 4, a pulley 7 fixed to a rotating shaft 2 a of the engine 2, and a fan belt 8. The rotation of the engine 2 is transmitted via the. A fan shroud 9 coaxial with the fan 4 and covering the periphery of the fan 4 is fixed to the rear surface of the radiator core 3. The bracket 5
A cover 11 having a plate-like shape and having a ventilation window 10 large enough to form a small chip clearance L with respect to the fan 4 is fixed to the cover 4, whereby the fan 4 is 11 are integrated.

At the four corners of the fan shroud 9 are provided elongated holes 12, 12,... As shown in FIG.
On the other hand, the cover 11 is provided with bolt insertion holes 13, 13,... At positions corresponding to the elongated holes 12, 12,. 13 and the elongated holes 12, 12
.. can be fastened and fastened with bolts 14 inserted continuously into the cover 11 and the fixing position of the cover 11 can be adjusted in the vertical direction by loosening the bolts 14 and relatively moving in the elongated holes 12. Has become.

When the engine 2 rotates, the fan 4 rotates via the pulley 7, the fan belt 8, and the pulley 6, and the air sucked from the radiator core 3 side by the rotation of the fan 4 causes the rear portion of the counterweight 1a to rotate. The radiator core 3 is discharged from an exhaust port 15 formed in the core and is cooled by air passing through the core.

In the fan 4, the bracket 5 and the cover 11 are integrated, and the cover 11 can be adjusted up and down with respect to the fan shroud 9.
.. Can be freely carried out within the range of the elongated hole 12 only by loosening the fan 4. At this time, since the fan 4 moves integrally with the cover 11, the chip clearance L is kept constant.
Tip clearance L is adjusted by adjusting the looseness of the fan belt 8.
Does not change. Further, since the cover 11 is fixed to the radiator core via the fan shroud 9, the support is stable and the reliability is high. Further, when the blade diameter of the fan 4 is changed by making the cover 11 flat,
This can be dealt with simply by replacing only one of the plate-like covers with one having a suitable ventilation window.

In the above embodiment, the fan shroud 9 is fixed to the radiator core 3 and the fan 4 is attached to the fan shroud 9.
As shown in FIG. 2, a cover 11 is provided with a hood portion 11a that covers the outer periphery of the fan and covers the fan 11 directly, without the fan shroud 9 interposed therebetween. It can be fixed to the radiator core 3. Also in that case, the adjusting mechanism using the elongated hole and the bolt can be suitably used.

As means for adjusting and fixing the cover 11 to the radiator core 3 or the fan shroud 9, for example, the fan shroud 9 and the cover 11 may be made of a flexible telescopic frame 16 such as rubber. And the cover 11
Can be fixed to the radiator core 3, the fan shroud 9, or other parts by appropriate means.
Further, the fan 4 may not only protrude rearward from the ventilation window 10 but also be completely hidden in the cover 11 as shown in FIG.

Although the above-described embodiment is of a type in which air is sucked, the invention is also applied to a type in which air is blown to a radiator core, and the moving direction of the fan is not limited to the vertical direction.

[0012]

According to the present invention, the chip clearance can be set narrow, and the chip clearance is kept constant even if the fan moves by adjusting the fan belt, so that the cooling efficiency is reduced. Absent. In addition, since the fan and the cover are integrated, the fan is stable even when subjected to vibration, and the fan blades do not contact the ventilation window. If an adjustment mechanism using a long hole and a bolt is adopted, the adjustment of the fan belt can be easily performed, and if the fan shroud and the cover are connected by a flexible telescopic frame, air may leak from the connection portion. If the cover is made flat, it is possible to easily cope with a change in the blade diameter by simply replacing one of the covers.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory views showing a mounting structure of a fan according to the present invention, wherein FIG.
(B) is a front view.

FIG. 2 is a side view showing a modified embodiment.

FIG. 3 is a side view showing another modified embodiment.

FIG. 4 is a front view showing a conventional example.

FIG. 5 is a side sectional view of a conventional example.

[Explanation of symbols]

1, machine stand, 1a, counterweight, 2, engine, 2a, rotating shaft, 3, radiator core, 4, fan, 4a, rotating shaft, 5, bracket, 6, 7,・ Pulley, 8. Fan belt, 9 Fan shroud,
10. Ventilation window, 10a ... room, 11 ... cover, 1
1a ··· hood, 12 ·· long hole, 13 ·· bolt insertion hole, 14 ·· bolt, 15 ··· exhaust port, 16 ··· elastic frame, 17 ··· long hole, 18 ··· fan cover, 19 ·・ Ceiling, L ・ ・ Chip clearance.

Claims (4)

[Claims] 1. A cover having a ventilation window that is larger than a fan blade diameter by an amount corresponding to a chip clearance is provided on a bracket rotatably supporting a fan disposed so as to face a radiator core. At least on the opposite side of the radiator core, it is fixed and integrated so as to be coaxial with the rotation axis of the fan, and the cover integrated with the fan and the bracket is attached to the radiator core or the radiator core. And a fan shroud fixed so as to cover only the periphery of the radiator so as to be movable and adjustable in the surface direction of the radiator core. 2. The radiator mounting structure according to claim 1, further comprising a movement adjusting mechanism provided by a combination of a bolt and a long hole between the cover and the radiator core or the fan shroud. 3. The fan is movable up and down with respect to the fan shroud by connecting the cover to a radiator cover or a fan shroud with a flexible telescopic frame. 2. A mounting structure for a fan in a radiator according to claim 1, further comprising a fixing means for locking. 4. The mounting structure for a fan in a radiator according to claim 1, wherein said cover is flat and fixed to a fan shroud.