JP2505056B2 - Coupling fan mounting structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mounting structure for a coupling fan used in an engine cooling system of an automobile.

[Prior Art] An engine cooling system of an automobile is provided with a fan driven by the rotation of the engine, and the rotation of the fan blows air to a radiator to perform heat exchange of cooling water in the radiator. Conventionally, this fan has been configured to be mechanically connected to a crankshaft of an engine by a belt or the like and directly driven to rotate, but in recent years, a coupling that is indirectly driven to rotate by viscous resistance of liquid is used. Fans are being adopted.

As shown in FIG. 10, this coupling fan comprises a fan body 100 and a mounting plate 200, and the fan body 100 is mounted on the coupling 300 via the mounting plate 200.

Here, the fan main body 100 is composed of a cylindrical boss portion 101 and a plurality of blade portions 102 that are provided in a substantially radial projection on the outer peripheral surface of the boss portion 101 and are arranged at intervals in the circumferential direction.
02 is configured to blow air from a radiator installed at a relative position on the coupling 300 side.

The mounting plate 200 has a thin plate shape and is formed in a ring shape having an opening in the center. The attachment plate 200 is fixed to the boss portion 101 of the fan body 100 and is attached to the operating portion 301 of the coupling 300.

The coupling 300 includes a case-shaped operating portion 301, a drive shaft 302 connected to a crankshaft of an engine, a drive plate 303 connected to the drive shaft 302 and rotatably held by the operating portion 301, and an operating portion 301. It is mainly composed of silicon oil interposed between the drive plate 303 and the drive plate 303. The rotational force of the drive plate 303 is transmitted to the operating portion 301 via the viscous resistance of silicon oil, and the fan body 100 is rotated via the mounting plate 200 attached to the operating portion 301.

By the way, in recent years, as the output of the engine is increased, the vibration of the coupled coupling fan is increased, so that the improvement of the durability of the coupling fan has been an issue.
Therefore, Japanese Utility Model Laid-Open No. 56-66094 discloses an anti-vibration fan in which a mounting plate has a spring action to provide a damping effect. As shown in FIG. 11, this mounting plate is composed of a ring-shaped base portion 400 and an extending piece 401 which projects from the base portion 400 inward in the radial direction in a substantially L shape and extends in the circumferential direction. The base portion 400 is fixed to the fan main body by the hole 402 provided in the. In addition, the guide surface 4 at the tip of the extending piece 401
03 makes contact with the coupling for positioning.
The extending piece 401 is fixed to the working portion of the coupling by the hole 404. The entire mounting plate is formed of a leaf spring, and the elastic elasticity of the extending piece 401 mainly absorbs vibration in the axial direction.

[Problems to be Solved by the Invention] However, in the mounting plate used for the vibration isolating fan described above, a complicated force such as an axial direction, a rotational direction, or a radial direction acts on the extending piece 401 when the fan rotates. . Therefore, a twisting force acts on the extension piece 401, and the extension piece 4
If the width of 01 is small, the extended piece 401
Was sometimes damaged.

Further, in the coupling fan, it is known that the durability of the enclosed viscous material such as silicon oil greatly affects the cooling performance of the engine. That is, since the viscosity decreases due to the deterioration of the viscous body, the drive plate 303
Force is not sufficiently transmitted to the actuating portion 301, which causes a decrease in the rotation speed of the fan body. Most of the deterioration of the enclosed viscous body is due to heat. Therefore, to prevent the deterioration of the viscous body, cool the coupling,
Therefore, it is preferable to cool the viscous body. Therefore, it is conceivable to increase the diameter of the coupling 300 to increase the area of the cooling fins 304 formed on the surface and improve the cooling efficiency.

However, in recent years, the inside of the engine room has become overcrowded, and it is not preferable to increase the size of the fan body. Therefore, it is desirable to increase only the diameter of the coupling while maintaining the current shape of the fan body. However, in this case, since the width of the mounting plate becomes narrow, in the case of the mounting plate having the above-mentioned vibration damping effect, the width of the extending piece 401 becomes narrow and the above-mentioned problem in strength occurs.
In some cases, the extension piece 401 cannot be provided.

The present invention has been made in view of such circumstances, and by improving the shape of the mounting plate, the mounting plate is provided with a vibration damping action and durability is improved, and the size of the fan main body is at present. The purpose is to allow the diameter of the coupling to be increased while maintaining the above.

[Means for Solving the Problems] A coupling fan mounting structure of the present invention which solves the above problems is provided with a substantially cylindrical boss portion and a substantially radial projection provided on the outer peripheral surface of the boss portion and spaced apart in the circumferential direction. The rotation of the drive unit consists of a fan body consisting of multiple blades arranged side by side, a drive unit connected to the rotating drive source, and an operating unit connected to the drive unit via a viscous body. In the coupling fan mounting structure, a coupling that is transmitted to the operating portion by the rotation of the operating portion, and a substantially ring-shaped mounting plate that is fixed to the boss portion and the operating portion and that transmits the rotation of the operating portion to the fan body are provided. The mounting plate has a ring-shaped base portion fixed to one of the boss portion and the actuating portion by a first fixing portion, and a substantially strip shape having spring elasticity, and one end extends from the base portion in the circumferential direction and a second end portion Fixed part Boss and has the other to a fixed displacement of the actuation portion, the first fixing portion and a second fixing unit is characterized in that on the same circumference with each other.

The fan main body and the coupling can be the same as those used in the related art. Incidentally, the coupling having a larger diameter than the conventional one can be used.

A feature of the invention is the shape of the mounting plate. The mounting plate is composed of a ring-shaped base portion and a substantially strip-shaped displacement portion. The base portion is fixed to one of the boss portion and the actuating portion by the first fixing portion, and the displacement portion is fixed to the other of the boss portion and the actuating portion at the other end of the second fixing portion which extends in the circumferential direction from the base portion. Vibration is absorbed by elastic deformation of the displacement portion having spring elasticity.

The greatest feature of the present invention is that the first fixing portion and the second fixing portion are on the same circumference. As a result, the direction in which the stress acts when the fan rotates is substantially the same in the first fixing portion and the second fixing portion, so that a twisting force or the like is prevented from acting on the displacement portion and damage to the displacement portion is prevented. To be done.

The mounting plate including the base portion and the displacement portion can be integrally formed from a metal plate having spring elasticity. It is also possible to form the base portion and the displacement portion separately and then fix both of them. In the latter case, only the displacement portion can be formed of a metal having spring elasticity.

In addition, it is desirable to form a guide surface for contacting and positioning the coupling on at least one end surface of the base portion and the displacement portion.

[Operation and Effect of the Invention] In the coupling fan mounting structure of the present invention, the ring-shaped base portion is fixed to one of the boss portion of the fan body and the coupling operation portion by the first fixing portion, and the displacement is substantially strip-shaped. The portion extends in the circumferential direction from the base portion and is fixed to the other of the boss portion and the operating portion by the second fixing portion at the other end. Since this displacement portion has spring elasticity, it is possible to absorb vibration in the axial direction from the drive source, improve durability in terms of heat deterioration of the coupling fan, and prevent abnormal noise.

Since the conventional mounting plate having a vibration damping action is formed by flat detection, the position of the extending piece having a spring action is formed on the inner peripheral side of the base portion. Therefore, the directions of the stresses acting on the fixed portion of the base portion and the fixed portion of the extending piece during rotation were different. Also, the width of the entire mounting plate was increased. However, in the present invention, the displacement portion extends in the circumferential direction from the base portion, and the first fixing portion and the second fixing portion are on the same circumference. Therefore, the directions of the stresses acting on the first fixing portion and the second fixing portion at the time of rotation are substantially the same, so that twisting does not occur and durability in terms of strength is improved. Further, the width of the entire mounting plate can be made smaller, the inner diameter can be made larger than the conventional one, and the outer diameter of the coupling can be made larger. As a result, the cooling efficiency of the coupling is improved, so that the deterioration of the viscous body is prevented and the durability is further improved.

That is, according to the mounting structure of the present invention, a coupling having a larger outer diameter than the conventional one can be used while similarly absorbing vibration by using a fan having the same shape as the conventional one. Therefore, since the cooling efficiency is improved, the deterioration of the viscous body is prevented even if the engine speed is improved as compared with the conventional case. Since the durability of the mounting plate itself is improved, higher durability can be realized. Also, it does not narrow the space in the engine room.

[Examples] Hereinafter, specific examples will be described.

(Embodiment 1) FIGS. 1 and 2 show a coupling fan mounting structure according to an embodiment of the present invention. This mounting structure includes a resin fan main body 1, a mounting plate 2, and a coupling 3. The fan main body 1 is mounted on the coupling 3 via the mounting plate 2.

The fan main body 1 is composed of a cylindrical boss portion 10 and a plurality of blade portions 11 provided on the outer peripheral surface of the boss portion 10 so as to project in a substantially radial manner and arranged at intervals in the circumferential direction. It is configured to blow air from a radiator installed at a relative position on the ring 3 side. Eight plate mounting holes 12 to which the mounting plate 2 is mounted via rivets are formed on the bottom surface of the boss portion 10 side by side at intervals in the circumferential direction.

The mounting plate 2 is a thin plate made of sheet metal, and is composed of a ring-shaped base portion 20 and four strip-shaped displacement portions 21 whose one end is fixed to the base portion 20, as shown in FIGS. 3 and 4. Has been done. The base 20 has a plate mounting hole for the fan body 1.
First fixing portion 22 as eight through holes at positions corresponding to 12
With. Further, the base 20 is formed with four notches 23 that are notched from the inner peripheral side toward the outer peripheral side at positions where the central angles thereof are deviated from each other by 90 degrees. And the strip-shaped displacement part 21 is
One end is fixed to the base 20 with a rivet 24, extends clockwise in FIG. 3, and the other ends are located at the notches 23, respectively. A second fixing portion 25 as a through hole is formed at the other end of the displacing portion 21, and the first fixing portion 22 and the second fixing portion 25 are located on the same circumference. At the other end of the displacement portion 21, a guide surface 26 is formed on the end surface facing inward in the radial direction. The displacement portion 21 is made of spring steel and is elastically deformable around one end fixed by the rivet 24.

The same coupling 3 as that shown in FIG. 10 is used, and since it has been described in detail in the section of "Prior Art", its explanation is omitted here. The operating part of the coupling 3
301 has a mounting portion 31 having a bolt 30 protruding in the axial direction, and a total of four mounting portions 31 are symmetrically formed at positions where the central angles are deviated by 90 degrees.

In order to form the mounting structure of this embodiment, as shown in FIG. 2, the fan body 1 and the mounting plate 2 are superposed at a position where the plate mounting hole 12 and the first fixing portion 22 are aligned with each other, and the rivet is attached. It is fixed integrally at 40. At this time, the fan body 1 is fixed in contact with the surface of the base portion 20 opposite to the surface having the displacement portion 21. Next, the guide surface 26 of the displacement portion 21 is brought into contact with the side circumferential surface of the coupling 3 for positioning, and the bolt 30 of the coupling 3 is inserted into the second fixed portion 25 of the displacement portion 21. The displacement portion 21 is attached to the coupling 3 by the nut 41.
It is fixed at 31.

In the mounting structure of this embodiment, the first fixing portion 22 and the second fixing portion
Since 25 is located on the same circumference, the directions of stresses acting on both fixing parts during rotation are almost the same. Therefore, a twisting force or the like is prevented from acting on the displacing portion 21, so troubles such as breakage are prevented, and durability is improved.

Further, in this embodiment, the vibration of the fan body 1 or the vibration of the coupling 3 is absorbed by the elastic deformation of the displacement portion 21 to form a vibration isolation fan. And base 20 and displacement
21 is a structure that is stacked in the axial direction, so the width of the entire mounting plate 2 is reduced, and the coupling 3 having a large diameter can be used. Therefore, the cooling rate of the coupling 3 is improved, and it is possible to follow the increase in engine speed. Further, since the thermal deterioration of the silicone oil in the coupling 3 is prevented, the durability is further improved.

Second Embodiment In the above-described embodiment, the base 20 is fixed to the fan body 1 and the displacement portion 21 is fixed to the coupling 3. However, in the present embodiment, as shown in FIG. The fixed portion 22 is fixed to the coupling 3, and the second fixed portion 25 of the displacement portion 21 is fixed to the fan body 1. The guide surface 26 is formed on the base portion 20. Even with such a configuration, the same operational effect as that of the first embodiment can be obtained.

(Embodiment 3) In addition, in the above two embodiments, the notch 23 is provided in the base 20 so as not to restrict the elastic deformation of the displacement portion 21, but in this embodiment, as shown in FIG. 7 and FIG. In addition, one end of the displacement portion 21 is fixed to the base portion 20 via the spacer 27. The other end of the displacement portion 21 is fixed to the fan body 1 via a spacer 28. With this configuration, desired action and effect can be obtained without interfering with elastic deformation of the displacement portion 21 without providing the cutout portion 23.

(Embodiment 4) In the above-mentioned embodiment, the base portion 20 and the displacement portion 21 are separate bodies, but as shown in FIG. 9, the mounting plate 2 in which the base portion 20 and the displacement portion 21 are integrally formed is used. You can also
In this mounting plate 2, a displacement portion 21 is formed by cutting and raising a part of a base portion 20 having spring elasticity. By fixing the fan body and the coupling in the same manner as in the second embodiment, the same operational effect as in the first embodiment is obtained.

[Brief description of drawings]

1 to 5 relate to a coupling fan mounting structure according to a first embodiment of the present invention, FIG. 1 is an overall plan view showing a partially broken view thereof, and FIG. FIG. 3 is an overall plan view of the mounting plate, and FIG. 4 is a cross-sectional view of an essential part of the mounting plate. 5 and 6 relate to the mounting structure of the second embodiment, and FIG. 5 is a plan view of a main part of the mounting plate, FIG.
The figure is a cross-sectional view of the relevant part. Figures 7 and 8 are third
7 is a plan view of a main part of the mounting plate, and FIG. 8 is a cross-sectional view of the main part. FIG. 9 is a perspective view of an essential part of the mounting plate of the fourth embodiment. FIG. 10 is an explanatory view showing the structure of a conventional coupling fan, and FIG.
The figure is a plan view of a conventional mounting plate. 1 …… Fan body, 2 …… Mounting plate 3 …… Coupling, 10 …… Boss part 20 …… Base part, 21 …… Displacement part 22 …… First fixed part, 23 …… Notch part 25 …… Second part Fixed part, 26 …… Guide surface 30 …… Bolt, 31 …… Mounting part, 41 …… Nut

Claims (1)

(57) [Claims] 1. A fan main body composed of a substantially cylindrical boss portion and a plurality of blade portions which are provided substantially radially on the outer peripheral surface of the boss portion and are arranged at intervals in the circumferential direction, and are connected to a rotating drive source. And a coupling for rotating the driving unit by transmitting the rotation of the driving unit to the operating unit by viscous resistance of the viscous body. And a mounting ring-shaped mounting plate fixed to the boss and the operating part and transmitting the rotation of the operating part to the fan main body, wherein the mounting plate is a first fixing part. A ring-shaped base portion fixed to one of the boss portion and the actuating portion, and a substantially strip shape having spring elasticity, one end extending in the circumferential direction from the base portion, and the second fixing portion at the other end, the boss portion, Displacement fixed on the other side of the working part And a first fixing part and a second part.
Mounting structure for a coupling fan, characterized in that the fixing parts are on the same circumference.