JPH0517452Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cooling device for a pull type clutch.

(Prior Art) A conventional cooling device installed in a pull type clutch, for example, fixes an air introduction member to a pressure plate, extends the introduction member to the outside from an enlarged opening of a diaphragm spring, and cools the air introduction member to the outside by rotating the air introduction member. Air is introduced into the pressure plate part from this point.

However, if the air introduction body is fixed to the pressure plate with rivets or the like, it takes time and effort to attach the air introduction body and the diaphragm spring. Further, a counterbore for attaching a rivet must be formed on the friction surface of the pressure plate, and there is a risk that the facing may be damaged by the edge of the counterbore or the rivet.

In response to this problem, the applicant of the present application has developed a cooling device as shown in FIG. 6, which fixes the air introduction body to a diaphragm spring to solve the above-mentioned drawbacks, and has filed an application (Utility Application No. 139,675/1982). That is, the diaphragm spring 8 is held between the air introduction body 18 and the support plate 25, and the air introduction body 18 and the diaphragm spring 8 are attached to a clutch cover or the like as one unit. However, according to this structure, during rotation of the clutch, the diaphragm spring 8 and the air introduction body 18 are displaced in the circumferential direction relative to the clutch cover 1, which causes wear, for example, at the outer peripheral fulcrum C1 of the diaphragm spring 8. Problems arise with durability.

(Purpose of the invention) The purpose of the invention is to enable the diaphragm spring and the air introduction body to be attached to the clutch cover as one unit, to prevent rotational deviation of the diaphragm spring with respect to the clutch cover, and to prevent the rotational deviation of the diaphragm spring or the clutch cover. This is to prevent wear on the fulcrum.

(Technical Means for Achieving the Object) In order to achieve the above object, the present invention has a scoop portion that opens toward the direction of rotation on the surface of the diaphragm spring opposite to the pressure plate side. An air introduction body is arranged, a support plate is arranged on the surface of the diaphragm spring on the pressure plate side, and the support plate and the air introduction body are fastened together with rivets within the enlarged opening, and the air introduction body and the support are fastened together. A diaphragm spring is sandwiched between the plates, a notch is formed in the Fulcrum boss portion, and a support plate is inserted into the notch to prevent rotation.

(Operation) While the clutch is rotating, the air introduction body rotates together with the diaphragm spring, thereby taking in external air from the scoop portion and supplying it to the pressure plate through the enlarged opening to cool the pressure plate.

While the clutch is rotating, the notch in the Fulcrum boss comes into contact with the support plate, which prevents the air introduction body from shifting relative to the pressure plate in the rotational direction. By contacting the rivet joint portion of the air introducing member with the diaphragm spring, the diaphragm spring is prevented from shifting in the rotational direction with respect to the clutch cover and pressure plate.

(Example) In FIG. 1 showing an example of a pull-type clutch to which the present invention is applied, assuming that the left side of the figure is the front in the axial direction, the clutch disk 5 has an inner spline hub connected to the output shaft 3 by a spline. A facing 6 is provided on the outer periphery of the clutch disk 5 so as to fit therein. A flywheel 2 is arranged on the front side of the facing 6, and a pressure plate 7 is arranged on the rear side. It is connected and supported. The clutch cover 1 is connected to the outer peripheral end of the flywheel 2, extends rearward, and covers the pressure plate 7 and the like in the radial direction.

The diaphragm spring 8 is disposed on the rear side of the pressure plate 7, its outer fulcrum C1 is supported by the annular convex portion 1a of the bent portion of the clutch cover 1, and the intermediate fulcrum C2 is supported by the pressure plate 7.
The inner supporting point C3 is engaged with the release bearing 29. A plurality of Fulcrum boss portions 10 are formed at intervals in the circumferential direction. Above release bearing 2
By pulling 9 rearward, the inner part of the diaphragm spring 8 is pulled rearward via the locking ring 14 of the release bearing 29, thereby releasing the clutch.

In FIG. 3, which is a view taken in the direction of the arrows in FIG. 1, the diaphragm spring 8 has a number of radial slits 16, each slit 16 having an enlarged opening 17 formed at its radially outer end; An air introducing body 18 is arranged on the rear surface of the diaphragm spring 8.

The air introduction body 18 has a plurality of connecting pieces 27 and a plurality of air scoop parts 20 on the inner side of the ring main body part 21.
The connecting piece 27 and the scoop part 20 are each arranged at a position corresponding to 17 in the opening. The connecting pieces 27 are arranged, for example, at positions corresponding to every second opening 17, and the scoop portions 20 are arranged at positions corresponding to the openings 17 between the connecting pieces 27. The scoop portion 20 is rotated in the rotation direction R.
The side end and the inner end are open. The connecting piece 27 is connected to the front side of the diaphragm spring 8 (the third
It is connected by a rivet 28 to a rectangular support plate 25 arranged on the back side of the figure.

In FIG. 2, which is an enlarged view of the air introduction body part in FIG. It's communicating.
The ring main body 21 has an annular protrusion 2 that protrudes forward.
3, and the annular protrusion 23 is in contact with the intermediate fulcrum C2 of the diaphragm spring 8. The connecting piece 27 is located within the opening 17. On the other hand, the support plate 25 is integrally formed with a protrusion 26 bent rearward at the outer end in the radial direction, and the protrusion 26 abuts on the intermediate fulcrum C2 of the diaphragm spring 8. The inner circumferential portion of the support plate 25 extends into the enlarged opening 17 and is integrally connected to the connecting piece 27 of the air introducing body 18 within the enlarged opening 17 by a rivet 28. That is, the support plate 25 and the air introduction body 18
By connecting them with rivets 28 within the enlarged opening 17, the intermediate support C2 is sandwiched between the protrusions 23 and 26, thereby fixing the air introducing body 18 to the diaphragm spring 8.

As shown in FIG. 4, each Fulcrum boss portion 10 of the pressure plate 7 is formed with a rotation stopper notch 12, into which a support plate 25 protrudes. The air introducing body 18 is configured not to rotate relative to the plate 7. The width of the notch 12 in the rotational direction is as shown in FIG.
It is formed to be slightly wider than the width in the rotational direction of No. 5.

Further, as shown in FIG. 3, the connecting portion of the connecting piece 27 and the support plate 25 within the enlarged opening 17 has a clearance with respect to the radially outer edge and the inner edge of the opening 17, respectively. There is.
In other words, at the time of release or facing wear,
The connecting portion 27 and the like are configured so as not to impede the elastic deformation operation of the diaphragm spring 8.

Explain the operation. While the clutch is rotating, the air introduction body 18 shown in FIG.
Air is taken in from the opening on the rotation direction side, and is supplied to the pressure plate 7 shown in FIG. 2 through the opening 17 to cool the pressure plate 7.

During rotation, the notch 12 of the Fulcrum boss 10 and the support plate 25 come into contact with each other, so that the air introduction body 18 always rotates synchronously with respect to the pressure plate 7, and the enlarged opening 1
Support plate 25 and air introduction body 1 are attached to the edge of 7.
The diaphragm spring 8 is brought into contact with the air introduction body 18 by the rivet connection portion of 8.
rotate synchronously. That is, the air introduction body 18 and the diaphragm spring 8 are no longer left behind in the rotational direction with respect to the clutch cover 1 and pressure plate 7 on the input side.
Therefore, the outer peripheral fulcrum portion C of the diaphragm spring 8
1 will never wear out.

In this way, when preventing rotational deviation of the diaphragm spring 8 with respect to the clutch cover 1 etc., between the air introduction body 18 and the diaphragm spring 8, the diaphragm is Since the load in the rotational direction of the spring 8 is divided into three parts, the surface pressure of each part is reduced, and there is no need to worry about unreasonable load being concentrated on one part.

In addition, when releasing the clutch, both protrusions 23 and 26 clamp the intermediate fulcrum C2 of the diaphragm spring 8, and the opening 1
Since the connecting pieces 27 and the like are arranged with a radial clearance from the diaphragm spring 7, the elastic deformation movement of the diaphragm spring 8 is not hindered.
Smooth release operation performance can be ensured, and there is no risk of shortening the life of the diaphragm spring 8.

(Another embodiment) (1) The number and arrangement pattern of the connecting pieces and scoop portions can be selected as appropriate. However, the connecting piece is formed at a position corresponding to the fulcrum boss portion of the pressure plate.

(2) Although the air introduction body 18 of the illustrated embodiment has an annular ring main body 21, the main body 21 may be divided into two or three parts and fixed to the diaphragm spring. It is possible.

(Effects of the invention) As explained above, according to the invention: (1) Since the diaphragm spring 8 is provided with the air introduction body 18 having the scoop portion 20 that opens toward the direction of rotation, the rotation of the clutch Cooling air can be introduced automatically and the pressure plate 7 can be cooled.

(2) Since the air introduction body 18 is fixed to the diaphragm spring 8 using the opening 17 of the diaphragm spring 8 with the support plate 25 and the rivet 28, it is easy to attach it to the pressure plate as in the conventional case. compared,
There is no need to provide a counterbore for rivets on the friction surface of the pressure plate. Therefore, the facing 6 is not damaged due to contact with the counterbore portion or the rivet head unlike in the conventional case, and the life of the facing 6 is improved.

(3) Since the air introduction body 18 is assembled in advance to the diaphragm spring 8 and can be assembled into a clutch cover or the like as one unit, the assembly work is easy.

(4) The support plate 25 engages with the notch 12 of the Fulcrum boss portion 10 of the pressure plate 7, and the support plate 25 and the like abut against the edge of the enlarged opening 17, so that the pressure plate 7 and the clutch cover 1 can be prevented from rotating relative to each other. Therefore, the outer peripheral fulcrum portion C1 of the diaphragm spring 8
The diaphragm spring 8 is not worn out, and the durability of the diaphragm spring 8 is improved.

(5) Air introduction body 18 and diaphragm spring 8
In order to lock the diaphragm spring 8 by the support plate 25 in the enlarged opening 17, the connecting piece 27 of the air introduction body 18, and the rivet 28, and divide the load in the rotational direction of the diaphragm spring 8 into these three parts. , the surface pressure of each part is reduced, and there is no need to worry about unreasonable loads being concentrated on one part. Therefore, the life of parts such as the connecting piece 27 is extended.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a pull-type clutch equipped with a cooling device according to the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, Fig. 3 is a view taken in the direction of the arrows in Fig. 1, and Fig. 4 is a FIG. 2 is a perspective view of the support plate portion, FIG. 5 is an enlarged cross-sectional view of FIG. 2, and FIG. 6 is a longitudinal sectional view of the conventional example. 1... Clutch cover, 2... Flywheel, 7... Pressure plate, 8... Diaphragm spring, 10... Fulcrum boss section, 12... Notch, 16... Slit, 17...
...Enlarged opening, 18...Air introduction body, 25...Support plate, 28...Rivet.

Claims (1)

[Scope of utility model registration request] A diaphragm spring having an enlarged opening at the outer end of a plurality of radial slits is provided, the outer fulcrum part of the diaphragm spring is supported by a clutch cover, the intermediate fulcrum part abuts against the fulcrum boss part of the pressure plate, and the inner fulcrum part is supported by a clutch cover. In a pull-type clutch in which the part of the diaphragm spring is supported by a release bearing, an air introduction body having a scoop part that opens in the direction of rotation is arranged on the surface of the diaphragm spring opposite to the pressure plate side, and A support plate is arranged on the pressure plate side surface, the support plate and the air introduction body are fastened together with rivets within the enlarged opening, and a diaphragm spring is sandwiched between the air introduction body and the support plate. A cooling device for a pull type clutch, characterized in that a notch is formed in the Fulcrum boss portion, and a support plate is inserted into the notch to prevent rotation.