JPH0729310Y2 - Friction clutch - Google Patents

Description

TECHNICAL FIELD The present invention relates to a friction clutch, and more particularly to a technique for preventing a disengagement failure of the friction clutch.

2. Description of the Related Art As a clutch device for transmitting or disconnecting power, a friction clutch that transmits a rotational torque by a frictional force has been widely used in a power transmission device of an automobile or the like. A kind of such a friction clutch is a disc-shaped input side rotating member that rotates together with the input shaft and a friction plate that rotates together with the output shaft between the output shaft side surface of the input side rotating member. A pressure plate for pinching and a clutch cover fixed to the input side rotating member so as to cover the pressure plate are provided, and a space in the clutch housing in the clutch housing is divided into an input side space and an output side space. Friction clutches of the type arranged so as to divide into two are known. For example, those described in JP-B-44-26344 or JP-B-44-26345 are examples thereof.

The above clutch is provided with blades for sending air to the friction plate side on the inner periphery of the flywheel that is the input side rotating member, and the friction plate and the pressure plate are pressed against the flywheel by wind pressure during high speed rotation. It is configured to prevent the friction clutch from being defectively disengaged.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, the former of the above-mentioned conventional friction clutches includes a through hole provided in the flywheel that rotates together with the flywheel between the inner peripheral portion of the flywheel and the clutch disc. A blade for sucking air is provided so that the space surrounded by the flywheel and the clutch disc is configured to have a higher pressure than the space surrounded by the clutch disc, the clutch cover, and the pressure plate. There is. The latter of the conventional friction clutches described above is provided with a hood that rotates with the flywheel and sends air from a through hole provided in the flywheel, at the inner peripheral portion of the input shaft side surface of the flywheel, Thus, the pressure in the space surrounded by the flywheel and the clutch disc is higher than that in the space surrounded by the clutch disc, the clutch cover, and the pressure plate.

However, according to such a conventional friction clutch, since the blades and the hood are provided on the inner peripheral portion of the flywheel, the peripheral speed thereof is low and the air in the clutch housing is also entrained. Or the relative speed between the hood and air cannot be obtained sufficiently. For this reason, the pressure in the space surrounded by the flywheel and the clutch disc cannot be efficiently increased, and the effect of preventing the friction clutch from being broken cannot be sufficiently obtained.

The present invention was made in the background of the above circumstances,
It is an object of the invention to provide a friction clutch that can sufficiently obtain a disengagement failure prevention effect.

Means for Solving the Problems The gist of the present invention for achieving such an object is to provide a disc-shaped input side rotating member that rotates together with the input shaft and one surface of the input side rotating member on the output shaft side. And a clutch plate fixed to the input side rotation member so as to cover the pressure plate and a pressure plate for pinching a friction plate rotating together with the output shaft, and the clutch housing in the clutch housing. The inner space is divided into the input side space and the output side space by 2 in the axial direction.
In a friction clutch of the type arranged to divide
At least one outer peripheral portion of the input side rotating member and the clutch cover is provided with vanes for generating an air flow from the output side space to the input side space, and the input side rotating member is provided with one surface of the input side to the output side. There is a through hole that penetrates through one surface.

In such a friction clutch, when the disc-shaped input side rotating member and the clutch cover rotate together with the input shaft, the output side space is provided by the blades provided on the outer peripheral portion of at least one of the input side rotating member and the clutch cover. To the input side space, the pressure of the input side space is increased with respect to the output side space, and the pressure in the input side space is input through a through hole provided in the input side rotating member. It is made to act on the space surrounded by the side rotating member and the friction plate, and its pressure is increased as the rotation speed becomes higher.

Therefore, according to the above friction clutch, the wind pressure at the time of high-speed rotation opposes the pressing force that presses the friction plate and the pressure plate against the input side rotating member, and the friction plate and the pressure plate move toward the input side rotating member. Since the pressure in the space surrounded by the friction plates is urged in the direction away from the input side rotating member, the friction clutch is preferably prevented from being broken.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a friction clutch 8 provided in a power transmission path of an automobile. In the figure, the clutch housing 10
Is mounted between the engine block 12 and the transmission housing 14, and a relatively sealed space is formed in the clutch housing 10. Inside the clutch housing 10, the crankshaft of the engine block 12
16 and an input shaft 18 of the transmission are provided so as to project close to each other on the same straight line. The crankshaft 16 and the input shaft 18 function as an input shaft and an output shaft of the friction clutch 8.

At the shaft end of the crankshaft 16, a flywheel 20 in the form of a thick disk that functions as an input side rotating member of this embodiment is fixed by bolts 22, and the flywheel 20 has an output shaft side (speed change gear). Clutch cover 24 on the machine side)
Are fixed by bolts 26. Clutch cover 24
Supports an annular plate-shaped pressure plate 28 via a plurality of elastically deformable straps, thereby holding the plate in a relatively non-rotatable manner and movable in the axial direction.

A clutch disc 30 is arranged on the input shaft 18 of the transmission so as not to be relatively rotatable and movable in the axial direction. The clutch disc 30 is a hub splined to the input shaft 18.
32, and a disc plate 34 interposed between the flywheel 20 and the pressure plate 28,
Clutch linings 36, 36 are fixedly mounted on the surface of the disk plate 34 facing the flywheel 20 and the surface of the disk plate 34 facing the pressure plate 28, respectively. The disc plate 34 is attached to the hub 32 via a plurality of torsion springs 38 arranged at equal angular intervals in the circumferential direction, and the clutch lining 36
The rotational torque transmitted from the crankshaft 16 to the disc plate 34 due to the frictional force between the flywheel 20 and the pressure plate 28 is transmitted to the torsion spring.
It is adapted to be transmitted to the hub 32 and further to the input shaft 18 via 38.

A cylindrical release hub 42 is fitted to a cylindrical member 40 protruding from the transmission housing 14 so as to be movable in the axial direction, and a release bearing 44 is attached to the front end portion thereof. Then, between the release bearing 44 and the clutch cover 24, an intermediate portion is engaged with the clutch cover 24 via a pivot ring 46, and an inner peripheral edge portion is engaged with an outer peripheral portion of the release bearing 44. The diaphragm spring 48 is provided.

The diaphragm spring 48 is a disc-shaped spring member whose inner peripheral side projects to the right in FIG. 1 in the free state, and is always brought into contact with the engaging projection 50 of the pressure plate 28 at the outer peripheral edge thereof, so that Urges the pressure plate 28 in the forward direction toward the flywheel 20. As a result, the friction clutch 8
The clutch disc 30 functioning as the friction plate of the present embodiment is pinched between the flywheel 20 and the pressure plate 28, and is held in the connected state for transmitting the rotational torque. FIG. 1 shows this state.

On the other hand, a flange 54 is provided at the rear end of the release hub 42 and is engaged with one end of a release fork 56. The release fork 56 is rotatably provided around a hemispherical tip of the support pin 58, and the other end of the release fork 56 is brought into contact with the tip of an output rod of a release cylinder (not shown). Then, when a clutch pedal (not shown) is depressed and the output rod of the release cylinder is projected, the release fork 56 is rotated counterclockwise in the figure, and the release hub 42 resists the urging force of the diaphragm spring 48. Be advanced.
Along with this, the pressure plate 28 is retracted by the elastic restoring force of the strap, and the clutch disc
Since the pinched state of 30 is released, the friction clutch 8 is switched to the disengaged state that interrupts the transmission of the rotational torque.
That is, the friction clutch 8 is of a push type that cuts off the transmission of rotational torque by advancing the release hub 42.

As shown in FIG. 2 showing the front surface of the clutch cover 24, a bolt 26 for fastening the clutch cover 24 to the flywheel 20.
As a result, the blades 60 protruding to the outer peripheral portion of the clutch cover 24 are fixed at a plurality of locations (six locations in this embodiment) in a state in which they are close enough not to contact the inner wall surface of the clutch housing 10. The blade 60 is punched from a thin plate by a press and bent, and as shown in detail in FIG. 3 which is an enlarged view of an arrow A in FIGS. 1 and 2, the transmission housing is shown in detail. The angle α with respect to the plane perpendicular to the axis of rotation in the direction of rotation as it approaches 14
And a tilted fin portion 62, and a mounting portion 64 which has a hole for inserting the bolt 26 and is parallel to a plane perpendicular to the rotation axis.

As shown in FIG. 1, the friction clutch 8 configured as described above is arranged in the clutch housing 10 so as to axially divide the space into an input side space 66 and an output side space 68. By forming a through hole 70 penetrating from one surface of the input side of the flywheel 20 to one surface of the output side, the input side space 66 and a space surrounded by the flywheel 20 and the clutch disc 30. Are in communication.

Therefore, when the friction clutch 8 is rotated in the rotation direction shown by the arrow in FIGS. 2 and 3 with the rotation of the engine, the blades 60 provided on the outer peripheral portion of the clutch cover 24.
By the action of, the air flow from the output side space 68 toward the input side space 66 is generated, and the input side space 66 is
The pressure is increased with respect to 68, and the pressure in the input side space 66 is applied to the space surrounded by the flywheel 20 and the clutch disc 30 through the through hole 70 formed in the flywheel 20, and high speed rotation and Indeed, the pressure is increased. Therefore, according to the friction clutch 8 of the present embodiment, the wind pressure at the time of high-speed rotation opposes the pressing force that presses the clutch disc 30 and the pressure plate 28 against the flywheel 20, and the clutch disc 30 and the pressure plate 28 are moved by the flywheel. Since the pressure in the space surrounded by 20 and the clutch disc 30 is urged in the direction away from the clutch disc 30, the friction clutch 8 is prevented from being defectively disengaged during high speed rotation.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, the blade 60 of the above-described embodiment is fixed to the clutch cover 24 side by the bolt 26, but the flywheel
It may be fixed on the 20 side.

Further, the fin portion 62 of the blade 60 of the above-described embodiment is located on the outer peripheral portion of the clutch cover 24 and the flywheel 20, but the outer peripheral portion of the clutch cover 24 or the flywheel.
It may be located only on the outer periphery of 20. In short, as long as the air flow from the output side space 68 to the input side space 66 is generated as the friction clutch 8 rotates,
The shape and position of the fin portion 62 may be changed appropriately.

Further, although the friction clutch 8 is of the so-called push type, the friction clutch 8 may be of the pull type in which the clutch is released when the release bearing 44 is moved in the backward direction.

Although not illustrated one by one, the present invention can be implemented in variously modified and improved modes based on the knowledge of those skilled in the art without departing from the spirit thereof.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment in which the present invention is applied to a friction clutch used in a power transmission device of an automobile. FIG. 2 is a front view showing a clutch cover of the friction clutch of FIG. FIG. 3 shows the main part of FIG.
FIG. 20: Flywheel (rotating member on the input side) 24: Clutch cover 28: Pressure plate 30: Clutch disc (friction plate) 60: Blade 70: Through hole

Claims (1)

[Scope of utility model registration request] 1. A pressure plate for pinching a friction plate rotating with the output shaft between a disc-shaped input rotating member rotating with the input shaft and one surface of the input rotating member on the output shaft side. And a clutch cover fixed to the input side rotating member so as to cover the pressure plate, and divides a space in the clutch housing into an input side space and an output side space in the axial direction in the clutch housing. In the friction clutch of the type arranged as described above, at least one of the input side rotating member and the clutch cover is provided with blades for generating an air flow from the output side space to the input side space, and the input side rotation member and the clutch cover are provided. A friction clutch, characterized in that a through hole penetrating from one surface of the input side to one surface of the output side is provided in the side rotation member.