JP3119419B2 - Fan shroud for heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan shroud interposed between a heat exchanger and a cooling fan, and more particularly, to a fan shroud such as a radiator which is mounted to be offset with respect to the cooling fan and its axis. The present invention relates to a fan shroud provided between heat exchangers.

[0002]

2. Description of the Related Art A radiator is provided in front of an engine, and a radiator core of the radiator has a tube having multiple tubes arranged in the direction of outside air and fins provided around the tube. Have been. An upper tank and a lower tank are respectively attached to the upper and lower sides of the radiator core, and a pair of support frames for fixing the upper tank and the lower tank are provided on both sides of the radiator core 14, respectively. A cooling fan is attached to a cooling fan drive shaft of the engine via a fan clutch so as to face the radiator core. This clutch interrupts the rotation of the drive shaft with respect to the cooling fan. A fan shroud is provided between the radiator and the cooling fan. The fan shroud is attached to the pair of support frames by screw means so that the outside air passing through the radiator core is smoothly guided to the fan.

[0003] On the other hand, in recent years, from the demand for improvement of the mountability, it has been studied to mount accessories arranged around the engine at a high density on, for example, trucks. However, when the radiator is disposed in front of the axis of the cooling fan, it is difficult to mount such an auxiliary device at a high density.

To solve this problem, as shown in FIG. 5, an attempt has been made to increase the degree of freedom in arranging accessories around the engine by displacing the radiator 2 with respect to the axis of the cooling fan 1. ing. Even in this case, radiator 2
A fan shroud 3 is interposed between the cooling fan 1 and the cooling fan 1. The fan shroud 3 has inclined portions 3a and 3b in accordance with the amount of deviation, so that the radiator 2
Is formed so as to be smoothly guided to the cooling fan 1 as indicated by the solid arrow.

[0005]

However, the radiator 2 corresponding to the inclined portions 3a and 3b of the fan shroud 3 cannot be provided with a screw means, and the conventional fan shroud 3 has a view point of workability and weight reduction. Made from synthetic resin. From this, cooling fan 1
When the radiator 2 is mounted so as to be deviated with respect to the axis of the fan shroud 3, the inclined portions 3a, 3 of the fan shroud 3 interposed therebetween.
In FIG. 5B, the inclined portion 3a close to the cooling fan 1 is pulled as shown by a broken line arrow in FIG. 5 due to a negative pressure inside the fan shroud 3 due to the rotation of the cooling fan 1, and is turned inward as shown by a dashed line. Sometimes deformed. In particular, when the engine is rotating, the temperature around the engine increases, and the Young's modulus of the fan shroud 3 decreases, so that the deformation tends to be accelerated. This deformation may cause the fan shroud 3 to contact the fan 1 or the clutch 4.

An object of the present invention is to provide a fan shroud for a heat exchanger in which a fan shroud interposed therebetween is not deformed by a negative pressure even when a radiator is attached while being deviated from an axis of a cooling fan. It is in.

[0007]

The configuration of the present invention for achieving the above object will be described with reference to FIGS. 1, 3 and 4 corresponding to the embodiment. The present invention relates to a cooling fan 16.
A pair of support frames 11a, 1
The cooling fan 16 is interposed between the radiator 11 attached to the cooling fan 1a and the inclined portion 21c according to the amount of deviation.
It is an improvement of a fan shroud for a heat exchanger having 21d. The characteristic configuration thereof includes a stay 23 erected on the pair of support frames 11a so as to abut on the radiator-side inner edge of the inclined portion 21c close to the cooling fan 16;
A plate 24 is provided so as to be in contact with the inner surface of the inclined portion 21 c close to the cooling fan 16 and has a base end fixed to the stay 23.

[0008]

The stay abuts against the radiator-side inner edge of the inclined portion 21c to prevent the inner edge from being deformed inward. The plate 24 contacts the inside of the inclined portion 21c to prevent the inclined portion 21c from being curved inward.

[0009]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 4, a radiator 11, which is a heat exchanger of a truck engine, has an upper tank 1.
2, a lower tank 13 and a radiator core 14. As shown in FIG. 4, the radiator core 14 has a tube 14 a provided in the vertical direction by connecting the upper tank 12 and the lower tank 13 to each other, and fins 14 b provided around the tube. The tubes 14a are multiplexed in the direction of the outside air, in this example, doubly arranged, and the cooling water flows through these tubes 14a. A pair of support frames 11a, 11a for fixing the upper tank 12 and the lower tank 13 are provided on both sides of the radiator core 14 with the upper tank 12 and the lower tank 13 attached to the upper and lower sides of the radiator core 14, respectively. The support frame 11a is formed by bending both sides corresponding to the angles of the tanks 12 and 13, and is fixed to the upper tank 12 and the lower tank 13. The support frame 11
In this example, three female screws 11b for mounting a fan shroud 21, which will be described later, are provided at three locations in this example.

As shown in FIG. 1, a radiator core 14 is mounted on a vehicle frame (not shown) so as to be deflected downward in this example with respect to a cooling fan 16. The cooling fan 16 is attached to a cooling fan drive shaft 17 of an engine 19 via a fan clutch 18.
The fan clutch 18 protrudes from the center of the cooling fan 16 toward the radiator core 14 so as to interrupt the rotation of the cooling fan drive shaft 17 with respect to the cooling fan 16. Further, the outer periphery of the cooling fan 16 is covered with a cylindrical portion 21a which is one end of the fan shroud 21 with a small gap.

The other end of the fan shroud 21 is formed in a square shape corresponding to the outer shape of the radiator core 14 and has a cylindrical shape.
It is formed so as to gradually change into a cylindrical shape following a. As shown in FIG. 3, a flange 21b facing the support frame 11a (FIG. 4) is formed at the outer edge of the other end of the square, and a screw hole (not shown) is formed at a position corresponding to the female screw 11b (FIG. 4). Is provided. The flange 21b is fixed to the support frame 11a by screwing the male screw 22 to the female screw 11b through the screw hole (not shown), and the fan shroud 21 is fixed to the radiator 11. Returning to FIG. 1, the fan shroud 21 is formed to have inclined portions 21 c and 21 d on the upper and lower surfaces in this example in accordance with the amount of deviation between the radiator core 14 and the cooling fan 16, and the outside air passing through the radiator core 14 is As shown by solid arrows, the cooling fan 16 is smoothly guided.

The characteristic configuration of the present embodiment is that, in the embodiment close to the cooling fan 16 in the inclined portions 21c and 21d of the fan shroud 21, the stay 23 which contacts the inner end edge of the upper inclined portion 21c on the radiator side is provided. It is located on a pair of support frames 11a, 11a. As shown in FIG. 2, the stay 23 is formed by slightly bending both ends of a rectangular tubular steel material having a length corresponding to the internal dimensions of the fan shroud 21 in the same direction, and is attached to the support frame 11a at the end. Mounting plate 23a is fixed by welding means. The support plate 11a is provided on the mounting plate 23a.
A mounting hole 23b corresponding to the female screw 11b is provided, and the female screw 11b on the upper side of the support frame 11a is mounted together with the fan shroud 21 by a male screw 22 (FIG. 3). In this state, as shown in FIG. 1, the inclined portion 21c comes into contact with the inner edge on the radiator side. The stay 23 has a pair of plates 24, 24.
Is fixed at its base end by welding means. With the stay 23 attached inside the fan shroud 21, the plates 24, 24 are extended upward and slightly bent so as to abut the inner surface of the inclined portion 21c as shown in FIG.

In the fan shroud for a heat exchanger configured as described above, the stay 23 is attached to the inner surface of the fan shroud 21 in advance by attaching plates 24, 24 to the inclined portion 21c. It is attached to the support frames 11a, 11a. In the attached state, the stay 23 has the inclined portion 21c.
Abuts against the inner edge on the radiator side of the cooling fan 16 to prevent the inner edge from being deformed inward by negative pressure caused by the rotation of the cooling fan 16. Further, the plates 24 provided on the stay 23 come into contact with the inside of the inclined portion 21c to contact the inclined portion 21c.
This prevents c from bending inward due to negative pressure.

In the above embodiment, a truck is used as a vehicle, but a passenger car or another vehicle may be used. In the case of a passenger car, a larger living space can be formed by increasing the arrangement density of the auxiliary devices. In the above embodiment, the radiator is biased downward with respect to the cooling fan. However, the radiator may be biased upward, left, right, or obliquely. In the above-described embodiment, the stay is formed by processing a square cylindrical steel rod. However, the stay may be formed by processing a cylindrical or cylindrical steel rod, or a member having another shape. Further, in the above embodiment, a pair of plates is fixed to the stay, but the number of plates may be one, or three or four.

[0015]

As described above, according to the present invention, when the radiator is mounted so as to be deviated with respect to the axis of the cooling fan, the stay which comes into contact with the inner end edge of the inclined portion of the fan shroud on the radiator side. On the support frame,
Since the plate abutting on the inner surface of the inclined portion is fixed to the stay, it is possible to prevent the inner end edge of the fan shroud from being deformed inward due to the negative pressure, and preventing the inclined portion from being curved inward. As a result, there is no possibility that the fan shroud contacts the cooling fan or the clutch,
Auxiliary equipment arranged around the engine can be mounted at a high density.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line AA of FIG. 3, showing a state in which a fan shroud according to an embodiment of the present invention is mounted on a support frame.

FIG. 2 is a perspective view of the stay.

FIG. 3 is a view of a state in which the fan shroud is attached to a support stay, as viewed from a cooling fan side.

FIG. 4 is a perspective view of the radiator.

FIG. 5 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Radiator 11a Support frame 16 Cooling fan 21 Fan shroud 21c Inclined part 23 Stay 24 Plate

Claims (1)

(57) [Claims] A cooling fan (16) interposed between a radiator (11) mounted on a pair of support frames (11a, 11a) and deviated from an axis of the cooling fan (16). In the heat shroud for a heat exchanger having inclined portions (21c, 21d) in accordance with the amount of deviation, the pair of the heat shrouds contact the inner edge of the inclined portion (21c) closer to the cooling fan (16) on the radiator side. A stay (23) installed on the support frame (11a, 11a), and a base end is provided so as to contact an inner surface of the inclined portion (21c) near the cooling fan (16), and a base end is fixed to the stay (23). A fan shroud for a heat exchanger, comprising: