JPH074835U - Fan shroud structure of radiator fan - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fan shroud structure that prevents the generation of rewind air that circulates in front of the radiator, avoids adverse effects on the radiator, and improves heat dissipation efficiency. [Structure] In a fan shroud 1 that covers the outer circumference of rotation of a radiator fan 10 arranged between a radiator 11 and an engine 12 and guides fan suction air, a ridge 6 protruding rearward from the lower part of the fan shroud 1. The fan shroud structure of the radiator fan is characterized in that it is installed in the right and left direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shroud provided around the outer circumference of rotation of a radiator fan of a vehicle.

[0002]

[Prior art]

 An example of a small truck showing a conventional shroud structure is shown in FIG. FIG. 1 is a schematic side sectional view of the front of the engine of a light truck.

An air intake 03 is provided between the front cover 01 and the bumper 02, a radiator 04 is disposed behind the air intake 03, and a radiator fan is disposed between the engine 05 and the radiator 04 located behind the radiator 04. 06 is provided.

A shroud 07 covers the outer circumference of rotation of the radiator fan 06, and the shroud 07 extends to the radiator 04 in front of the radiator fan 06 to appropriately guide the fan suction air Wf passing through the radiator 04 to suck the fan suction air. We try to introduce Wf as much as possible.

[0005]

[Problems to be solved]

 However, since the traveling wind Wa passes under the bumper 02, the space 08 (the space surrounded by the broken line) between the fan suction wind Wf sucked by the radiator fan 06 and the traveling wind Wa becomes negative pressure due to the upper and lower winds. , A part of the fan suction air Wf is guided downward, and one side is guided by the fan suction air Wf entering the radiator 04 from under the bumper 02, and the wind guided downward is rewound as shown by the broken line arrow. It becomes wind Wr, and a flow that flows under the radiator 04 and enters the radiator 04 again occurs.

This rewind wind Wr is the hot air that has once passed through the radiator 04, and the hot air passes through the radiator 04 again to adversely affect the radiator 04 and reduce the heat radiation efficiency. The present invention has been made in view of the above point, and an object of the present invention is to provide a fan shroud structure which prevents the generation of the rewind air Wr.

[0007]

[Means and Actions for Solving the Problems]

 In order to achieve the above object, the present invention provides a fan shroud that covers a rotating outer circumference of a radiator fan disposed between a radiator and an engine and guides fan suction air, and projects rearward at a lower portion of the shroud. The fan shroud structure of the radiator fan is provided by arranging the ridges oriented in the left-right direction.

Even if a part of the fan suction air Wf is guided downward due to the negative pressure generated below the radiator fan, the ridges at the lower part of the fan shroud guide the downwardly guided wind again to the front of the radiator. It is possible to prevent the generation of rewind wind that circulates to the side.

[0009]

【Example】

 An embodiment of the present invention shown in FIGS. 2 to 5 will be described below. 2 is a perspective view of the fan shroud 1 of the present embodiment, FIG. 3 is a rear view thereof, and FIG. 4 is a side view thereof.

The fan shroud 1 is an integrally molded resin product and has a substantially flat rectangular box shape. A circular opening 4 is formed. An upper part of the peripheral edge of the circular opening 4 partially extends in a circular arc shape and extends rearward to form a guide wall 5.

The lower half of the left and right sides of the bottom wall 3 and the lower side bulge rearward to integrally form a U-shaped ridge 6. In the ridge 6, the bulging surface of the bottom wall 3 is inclined obliquely, and the edge of the inclined surface 6a is bent and connected to the side wall 2.

FIG. 5 shows a state in which the fan shroud 1 is mounted on the radiator fan 10. Between the radiator 11 and the engine 12, the fan shroud 1 is arranged with the radiator fan 10 facing the circular opening 4 of the fan shroud 1. The protrusions 6 on the lower part of the fan shroud 1 and the lower half of the left and right side parts protrude rearward.

Therefore, even if a part of the fan suction air Wf is induced downward by the negative pressure created between the traveling air Wa passing below the radiator 11 and the fan suction air Wf, the induced fan suction air Wf is It is guided rearward along the inclined sloped surface 6a of the lower ridge 6 and joins with the traveling wind Wa, so that the radiator 11 is prevented from flowing forward and the conventional rewind wind Wr is not generated.

Further, the negative pressure generated below the radiator fan 10 may guide a part of the left and right sides of the fan suction air Wf to the left and right sides, and this also causes the left and right ridges 6 to guide backward. And it prevents the generation of wind on the left and right sides.

As a result of the running test using the actual vehicle, it was possible to confirm that the heat radiation property was improved by about 5% as compared with the one without the normal protruding portion. It is also possible to prevent the radiator 11 from being adversely affected by the hot wind of the rewinding wind flowing to the radiator 11.

Although the fan shroud 1 is integrally molded in the above embodiment, an example in which the ridges are formed separately is shown in FIGS. 6 and 7. In this embodiment, as shown in FIG. 6, a separate ridge member 21 is integrally attached to an ordinary fan shroud 20 having no ridge.

The ridge member 21 is U-shaped and has an outer wall 21a whose cross section is bent at an acute angle in the center, an inner wall 21b, and an extending wall 21c which extends slightly inward from the inner wall 21b in the same plane.

In order to assemble the ridge member 21 with the fan shroud 20, the ridge member 21 is provided along the lower side of the fan shroud 20 and the lower half of the left and right side edges, and the outer side wall 21 a is the side wall 20 a of the fan shroud 20. Part of the fan shroud 20 is abutted against the bottom wall 20b of the fan shroud 20 to bond them.

The ridge member 21 forms a ridge protruding rearward at the lower side of the fan shroud 20 and the lower half of the left and right side edges.

The ridge member 21 can be made of a sheet metal or a molded product of a resin material. Further, the fan shroud 20 may be attached to the protruding member 21 by bolts.

As described above, the protrusion member can be attached to the conventional fan shroud later.

[0022]

[Effect of device]

 The present invention can prevent the generation of rewind air that circulates in front of the radiator with a simple structure in which a protrusion is provided on the lower part of the fan shroud, avoid the adverse effect on the radiator, and improve the heat dissipation efficiency.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view of a required part of a vehicle including a conventional fan shroud.

FIG. 2 is a perspective view of a fan shroud according to an embodiment of the present invention.

FIG. 3 is a rear view of the same.

FIG. 4 is a side view of the same.

FIG. 5 is a schematic sectional view of a required part of a vehicle including the fan shroud.

FIG. 6 is an exploded perspective view of a fan shroud of another embodiment.

FIG. 7 is a side sectional view of the fan shroud.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fan shroud, 2 ... Side wall, 3 ... Bottom wall, 4 ... Circular opening, 5 ... Guide wall, 6 ... Ridge, 10 ... Radiator fan, 11
... radiator, 12 ... engine, 20 ... fan shroud,
21 ... Ridge member.

Claims (1)

[Scope of utility model registration request] 1. A fan shroud that covers the outer circumference of rotation of a radiator fan arranged between a radiator and an engine and guides fan suction air, and a protrusion protruding rearward in the lower part of the fan shroud in the left-right direction. Radiator fan fan shroud structure characterized by being oriented.