JPH0441919A - Mounting structure of coupling fan - Google Patents

Abstract

PURPOSE:To allow availability of a coupling of a bigger outer diameter than conventional ones while absorbing vibration by constituting a mounting plate of approximate ring-shape which transmits the rotation of an actuating part to a fan body of the first plate of ring-shape and the second plate of approximate strip-shape with spring elasticity. CONSTITUTION:A resin-made fan body 1 is mounted on a coupling 3 through a mounting plate 2, and two or more plate mounting holes 12 are formed at equal spaces at the bottom surface of a boss part 10 of the fan body 10. The mounting plate 2 is made of sheet metal and constituted of the first plate 20 of ring-shape and the second plate 21 of four-strip shape where one end of each strip is fixed to the first plate. Fan fitting holes 22 are formed in the first plate 20 at the position corresponding to the position of the above- mentioned mounting holes 12, and four notches 23 are formed from the inner side toward the outer side. On the other end of the second plate 21 where coupling fitting holes 25 ate formed, a guide surface 26 is formed on the end surface facing racing radially to the inner side so as to be useful in radial positioning of a coupling 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] 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 whose driving source is the rotation of the engine, and the rotation of the fan blows air to a radiator to exchange heat with cooling water in the radiator. Traditionally, this fan has been configured to be mechanically connected to the engine crankshaft and a belt and directly driven to rotate, but in recent years, a coupling that is driven to rotate indirectly by the viscous resistance of the liquid has been introduced. Fans are employed.

As shown in FIG. 10, this coupling fan consists of a fan body 100 and a mounting plate 200, and the fan body 100 is attached to a coupling 300 via the mounting plate 200.

Here, the fan main body 100 includes a cylindrical boss portion 101,
Consisting of a plurality of wing sections 102 that protrude approximately radially from the outer peripheral surface of the boss section 101 and lined up at intervals in the circumferential direction, the wing sections 102 rotate to blow air from a radiator installed at a relative position on the coupling 300 side. is configured to do so.

The mounting plate 200 is a thin plate, and is formed into a ring shape with an opening in the center. This mounting plate 200 is fixed to the boss portion 101 of the fan main body 100 and is also attached to the operating portion 301 of the coupling 300.

The coupling 300 includes a case-shaped actuating part 301, a drive shaft 302 connected to the crankshaft of the engine, a drive plate 303 connected to the drive shaft 302 and rotatably held by the actuating part 301, and the actuating part 301. and silicone oil interposed between the drive plate 303 and the drive plate 303. The rotational force of the drive plate 303 is transmitted to the actuating part 301 via the viscous resistance of silicone oil, and the mounting plate 203 attached to the actuating part 301 is
This is a configuration in which the fan main body 100 rotates through the rotation angle 0.

Incidentally, as the output of engines has increased in recent years, the vibrations of the coupled coupling fans have increased, so improving the durability of the coupling fans has become an issue. Therefore, Japanese Utility Model Application Publication No. 56-66094 discloses a vibration-isolating fan in which a mounting plate has a spring action to provide a damping effect. As shown in FIG. 11, this mounting plate consists of a ring-shaped base 400 and an extending piece 401 that protrudes radially inward from the base 400 and extends in the circumferential direction. Hole 4 provided in
02 fixes the base 400 to the fan body. Further, the guiding surface 403 at the tip of the extending piece 401 abuts against the coupling for positioning, and the hole 404 allows the extending piece 4
01 is fixed to the actuating part of the coupling. This mounting plate is entirely formed from a leaf spring, and is intended to mainly absorb vibrations in the axial direction by the spring elasticity of the extending piece 401.

[Problems to be Solved by the Invention] It is known that in a coupling fan, the durability of the sealed viscous material, such as silicone oil, greatly affects the cooling performance of the engine.

That is, since the viscosity decreases due to deterioration of the viscous body, the force of the drive plate 303 cannot be sufficiently transmitted to the actuating part 301, resulting in a decrease in the rotational speed of the fan body. Here, most of the deterioration of the encapsulated viscous material is caused by heat. Therefore, in order to prevent deterioration of the viscous body, it is preferable to cool the coupling and thereby cool the viscous body. Therefore, it is possible to improve the cooling efficiency by increasing the diameter of the coupling 300 and increasing the area of the cooling fins 304 formed on the surface.

However, in recent years, engine compartments have become overcrowded, and it is not desirable to increase the size of the fan body. Therefore, it is desirable to maintain the current shape of the fan body while increasing only the diameter of the coupling. However, in this case, the width of the mounting plate becomes narrower, so in the case of the above-mentioned mounting plate having a damping effect, the width of the extension piece 401 becomes narrower, causing problems in terms of strength. Further, depending on the case, there may be cases where the extension piece 401 cannot be provided.

The present invention was made in view of these circumstances, and
By improving the shape of the mounting plate, the diameter of the coupling can be increased while maintaining the current size of the fan body, and the aim is to provide the mounting plate with a damping effect.

[Means for Solving the Problems] The coupling fan mounting structure of the present invention that solves the above problems includes a substantially cylindrical boss portion and a substantially radially protruding structure on the outer circumferential surface of the boss portion, spaced apart from each other in the circumferential direction. The fan body consists of a plurality of blade parts lined up in a row, a drive part connected to a rotating drive source, and an actuating part connected to the drive part via a viscous body, and the rotation of the drive part is caused by the viscous resistance of the viscous body. A coupling fan mounting structure comprising: a coupling that rotates the actuating part by transmitting the rotation to the actuating part; and a substantially ring-shaped mounting plate that is fixed to the boss part and the actuating part, respectively, and transmits the rotation of the actuating part to the fan body. , the mounting plate includes a ring-shaped first plate fixed to one of the boss part and the actuating part, and a substantially strip-shaped plate having spring elasticity, one end of which is overlapped and fixed to the first plate in the axial direction, and the other end is fixed to the boss part. and a second plate fixed to the other side of the actuating part, and at least one of the first plate and the second plate has a guide surface on the inner circumferential surface that comes into contact with the coupling and performs radial positioning. Features.

The fan main body and coupling may be the same as conventional ones. Naori tubing rings with a larger diameter than conventional ones can be used.

The greatest feature of the present invention is that the mounting plate is composed of two elements: a first plate and a second plate.

The first plate has a ring shape and is fixed to one of the boss part of the fan main body or the actuating part of the coupling by a plurality of mounting parts provided at intervals in the circumferential direction.

The substantially rectangular second plate has spring elasticity, has an end fixed to the first plate so as to overlap in the axial direction, and a mounting portion at the other end fixed to a boss portion of the fan body or an operating portion of the coupling. There is. That is, in the mounting structure of the present invention, since the fan main body is fixed to the coupling via the elastically deformable second plate, vibrations can be absorbed by the elastic deformation of the second plate. The attachment part at the other end of the second plate may be located on the inner or outer circumference side of the attachment part of the first plate, but it is preferable that the attachment part at the other end of the second plate be located on the same circumference as the attachment part of the first plate. desirable.

As a result, the direction in which stress acts when the fan rotates is the first direction.
Since the mounting portion of the plate and the mounting portion of the second plate substantially coincide with each other, torsional force or the like is prevented from acting on the second plate, thereby preventing damage to the second plate.

Further, the radial positional relationship between the first plate and the second plate is not particularly limited, and the plate located on the inner peripheral side is provided with a guide surface that comes into contact with the coupling.

[Operations and Effects of the Invention] In the coupling fan mounting structure of the present invention, one of the boss portion of the fan body and the actuating portion of the coupling is fixed to the ring-shaped first plate, and the substantially rectangular second plate is fixed to the ring-shaped first plate. One end is fixed to the first plate, and the other end is fixed to the other of the boss portion and the operating portion. Since this second plate has spring elasticity, it can absorb vibrations from the drive source, improve the durability of the coupling fan, and prevent abnormal noise.

Conventional mounting plates with vibration damping effects were integrally formed by stamping sheet metal, so the position of the extending piece with spring action was restricted to the inner circumferential side, and the guiding surface was formed on the extending piece. I needed to. However, in the present invention, the second
One end of the plate is axially stacked and fixed to the first plate. Therefore, the second plate and the first
The mounting plate can be placed at almost the same position in the radial direction as the mounting plate, and the inner diameter of the mounting plate as a whole can be made larger than before. Since the guide surface is provided on the surface of the plate on the inner circumferential side, the inner diameter of the guide surface can also be made larger than in the past, that is, the outer diameter of the coupling can be made larger. This improves the cooling efficiency of the coupling, thereby preventing deterioration of the viscous body and further improving durability.

That is, according to the mounting structure of the present invention, it is possible to use a coupling having a larger outer diameter than the conventional one while absorbing vibrations in the same way as the conventional fan. Therefore, since the cooling efficiency is improved, deterioration of the viscous body is prevented even if the engine speed is higher than before, and high durability can be achieved. Moreover, the space in the engine room is not narrowed down.

[Example] Hereinafter, this will be explained in detail using examples.

(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 fan body 1 made of resin, a mounting plate 2, and a coupling 3, and the fan body 1 is attached to the coupling 3 via the mounting plate 2.

The fan body 1 consists of a cylindrical boss O and a plurality of blades 11 that protrude approximately radially from the outer circumferential surface of the boss 10 and are arranged at intervals in the circumferential direction. Air is blown from a radiator installed at a relative position on the side of the coupling 3. Eight plate mounting holes 12, through which the mounting plate 2 is mounted via rivets, are formed in a row at intervals in the circumferential direction on the bottom surface of the boss portion 10.

The mounting plate 2 is a thin plate made of sheet metal, and as shown in FIGS. 3 and 4, it includes a ring-shaped first plate 20,
It is composed of four rectangular second plates 21 having one end fixed to the first plate 20. 1st plate 2
0 has eight fan mounting holes 22 at positions corresponding to the plate mounting holes 12 of the fan body 1. Further, the first plate 20 has four notches 23 cut out from the inner circumferential side toward the outer circumferential side, and are formed at positions whose center angles are shifted by 90 degrees from each other. The rectangular second plate 21 has one end fixed to the first plate 20 with a rivet 24,
It extends clockwise in FIG. 3, and the other end is located at the notch 23, respectively. A coupling mounting hole 25 is formed at the other end of the second plate 21, and the fan mounting hole 22 and the coupling mounting hole 25 are located on the same circumference. Further, at the other end of the second plate 21, a guide surface 26 is formed on the end face facing radially inward. The second plate 21 is made of spring steel and can be elastically deformed around one end fixed with a rivet 24.

The coupling 3 used is the same as the one shown in FIG. 10, and since it was explained in detail in the "Prior Art" section, the explanation will be omitted here. The actuating part 301 of the naori tube ring 3 has a mounting part 31 having a bolt 30 projecting in the axial direction, and a total of four mounting parts 31 are formed symmetrically at positions whose center angles are shifted by 90 degrees.

To form the mounting structure of this embodiment, as shown in FIG. is fixed integrally. At this time,
The fan body 1 is fixed in contact with a surface of the first plate 20 opposite to the surface having the second plate 21. Then the second
The guide surface 26 of the plate 21 is brought into contact with the side peripheral surface of the coupling 3 for positioning, and the bolt 30 of the coupling 3 is inserted into the coupling mounting hole 25 of the second plate 21. The second plate 21 is fixed to the mounting portion 31 of the coupling 3 by the nut 41.

In the mounting structure of this embodiment, the vibration of the fan body 1 or the vibration of the coupling 3 is absorbed by the elastic deformation of the second plate 21, thereby forming a vibration-proof fan. Since the first plate 20 and the 27th plate 21 are stacked in the axial direction, the width of the entire mounting plate 2 is reduced, and a coupling 3 with a large diameter can be used. Therefore, the cooling efficiency of the coupling 3 is improved, and it is possible to follow the increase in engine speed. Furthermore, since thermal deterioration of silicone oil and the like inside the coupling 3 is prevented, durability is improved.

Roughly speaking, since the fan mounting hole 22 and the coupling mounting hole 25 are located on the same circumference, torsional force or the like is hardly applied to the second plate 2 during rotation. Therefore, problems such as damage to the second plate 21 are prevented, and durability is improved from this aspect as well.

In this embodiment, the fan mounting hole 22 and the coupling song mounting hole 25 are located on the same circumference, but as shown in FIG. In the case where the fan mounting hole 22 and the coupling mounting hole 25 are located on the side, the positions of the fan mounting hole 22 and the coupling mounting hole 25 may be shifted in the radial direction. As described above, the mounting structure of this embodiment can be applied to couplings of various diameters by simply changing the shape of the second plate 21, and has a high degree of freedom.

(Embodiment 2) In the embodiment described above, the first plate 20 is
The second plate 21 is fixed to the coupling 3. However, in this embodiment, as shown in FIG. It is set up. Then, as shown in FIG. 7, the first plate 20 is fixed to the coupling 3, and the second plate 20 is fixed to the coupling 3.
A plate 21 is fixed to the fan body 1. Further, the guide surface 26 is formed on the first plate 20. Even with this configuration, the same effects as in the first embodiment can be obtained.

(Embodiment 3) Furthermore, in the above two embodiments, the first plate 20 was provided with the notch 23 so as not to restrict the elastic deformation of the second plate 21. As shown in FIG. 2, one end of the second plate 21 is fixed to the first plate 20 via a spacer 27. Further, the other end of the second plate 21 is fixed to the fan body 1 via a spacer 28. With this configuration, the desired effect can be achieved by 1q without hindering the elastic deformation of the second plate 21 even without providing the notch 23.

[Brief explanation of the drawing]

1 to 5 relate to the mounting structure of a coupling fan according to a first embodiment of the present invention, in which FIG. 1 is an overall plan view partially cut away, and FIG. 2 is a sectional view of essential parts thereof; FIG. 3 is an overall plan view of the mounting plate, FIG. 4 is a sectional view of a main part of the mounting plate, and FIG. 5 is a plan view of a main part of another embodiment of the mounting plate. 6 and 7 relate to the mounting structure of the second embodiment, FIG. 6 is a plan view of the main part of the mounting plate, and FIG. 7 is a sectional view of the main part thereof. 8 and 9 relate to the mounting structure of the third embodiment, FIG. 8 is a plan view of the main part of the mounting plate, and FIG. 9 is a sectional view of the main part. FIG. 10 is an explanatory diagram showing the configuration of a conventional coupling fan, and FIG. 11 is a plan view of a conventional mounting plate. 1...Fan body 2...Mounting plate 3.
...Coupling 10...Post gfS20...
First plate 21... Second plate 22... Fan mounting hole 23... Notch 8fS25... Coupling mounting hole 26... Guide surface 30... Bolt
31...Mounting part 41...Natsuto Patent Applicant Aisin Chemical Co., Ltd. Agent Patent Attorney Hiroshi Okawa Figure 2

Claims (1)

[Claims] (1) A fan body consisting of a substantially cylindrical boss portion and a plurality of blade portions protruding substantially radially from the outer peripheral surface of the boss portion and arranged at intervals in the circumferential direction, and connected to a rotating drive source. A coupling comprising a drive part and an actuation part connected to the drive part via a viscous body, in which rotation of the drive part is transmitted to the actuation part by the viscous resistance of the viscous body, and the actuation part rotates; a substantially ring-shaped mounting plate that is fixed to the boss portion and the actuating portion, respectively, and transmits rotation of the actuating portion to the fan body;
In the mounting structure for a coupling fan, the mounting plate includes a ring-shaped first plate fixed to one of the boss portion and the actuating portion, and a substantially strip-shaped plate having spring elasticity and having one end attached to the first plate. The second plate is stacked and fixed in the axial direction, and the other end is fixed to the other of the boss part and the actuating part, and the inner peripheral surface of at least one of the first plate and the second plate has the above-mentioned plate. A mounting structure for a coupling fan, characterized by having a guide surface that comes into contact with a coupling and performs radial positioning.