JPH037628Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a flywheel assembly in which the flywheel is divided into two parts and a part of the mass of the flywheel is used as a damper.

(Prior art and its problems) The applicant of the present application has filed Japanese Patent Application No. 60-44298 (Japanese Unexamined Patent Publication No. 61-201948) regarding this type of flywheel assembly.
We have developed prior technologies such as

In this prior art, the flywheel is divided into a first and second flywheel, the mass of the second flywheel is used as a damper, and a friction damping mechanism connects the second flywheel and the clutch disk only when the clutch is engaged. However, there is a problem in that when the clutch is disengaged, the frictional force acting on the second flywheel disappears, causing the second flywheel to swing significantly.

(Purpose of the invention) The invention provides a flywheel assembly that divides the flywheel into two and utilizes part of the mass of the flywheel as a damper, and that can prevent the second flywheel from swinging when the clutch is disengaged. is intended to provide.

(Structure of the invention) (1) Technical means The invention consists of a first flywheel that is fixed to the crankshaft of the engine and to which a clutch disk is pressed, and a second flywheel of a predetermined mass that is provided concentrically with the first flywheel. In a flywheel assembly having a wheel, the inner circumferential portion of the first flywheel where the clutch disk is intermittent is fixed to the end of the crankshaft of the engine, and the second flywheel is attached along the end surface of the first flywheel on the side opposite to the clutch disk. A flywheel is provided to be rotatable, and a friction damping mechanism is provided between the second flywheel and the clutch disk to connect the two only when the clutch is connected, and a friction damping mechanism is provided between the two flywheels to prevent clutch disengagement in which the friction damping mechanism does not work. This is a flywheel assembly characterized by interposing a friction material that sometimes generates a frictional force between both flywheels.

(2) Effect When the clutch is disengaged, the frictional force from the friction material causes the second
Prevent the flywheel from swinging.

(Embodiment) In the drawing showing the upper half (center line O) of an automobile clutch employing the present invention, 10 is the rear end of the crankshaft of the engine. A first flywheel 1 having a substantially annular shape is attached to the rear end portion 10 of the crankshaft.
The second boss portion 14 is fixed with a bolt 16.
A clutch cover 18 is fixed to the outer circumference of the first flywheel 12 with bolts 20, and a clutch disk 22, a pressure plate 24, a diaphragm spring 26, etc., which will be described in detail later, are housed inside the clutch cover 18. There is.

A friction facing 30 of the clutch disk 22 faces the pressure contact surface 28 of the first flywheel 12, and a friction facing 30 is provided between the pressure contact surface 28 and the pressure plate 24, which is pressed forward by the diaphragm spring 26 when the clutch is engaged. The friction facing 30 is adapted to be clamped therebetween. The two friction facings 30 are connected to the cushioning plate 32.
It is connected to the connection plate 34 via. The connecting plate 34, which has a substantially inverted L-shaped cross section, is sandwiched between a flange portion 36 and a side plate 38, and a torsion spring 40 is installed between the connecting plate 34, the flange portion 36, and the side plate 38.
is provided. The flange portion 36 is continuous with the spline hub 42 at the inner peripheral portion, and is connected to the spline hub 42
A bushing 44 is interposed between the connecting plate 34 and the connecting plate 34. Spline internal teeth 46 are formed on the inner peripheral surface of the spline hub 42, and are spline-fitted to an output shaft 48 that becomes an input shaft when viewed from a subsequent transmission (not shown).

a second flywheel along the front end surface of the first flywheel 12;
A flywheel 50 is provided. This second
The flywheel 50 has a substantially annular inner peripheral portion 54 that is slidably supported on the boss portion 14 by a bearing 52.
, an outer circumferential portion 56 having a predetermined mass that is continuous with the outer circumference of the inner circumferential portion 54 , and an elastic support mechanism 58 that elastically connects the second flywheel 50 to the first flywheel 12 .

First, a bearing 52 is provided on the inner peripheral surface of the inner peripheral portion 54.
The outer race 52a is the bearing presser 55,
It is fixed with a bolt 55a, and a bearing 52
The inner race 52b is connected to the cylindrical surface 1 of the boss portion 14.
4a so as to be slidable in the axial direction.
A cone spring 60 is provided in the annular groove 14b of the boss portion 14 via a bush 60a.
The spring force of this cone spring 60 urges the second flywheel 50 rearward.

The elastic support mechanism 58 is composed of a torsion spring 62, side plates 64, 66, etc., and the torsion spring 62 is housed in a window hole 68 between the inner circumferential part 54 and the outer circumferential part 56, It is held by side plates 64 and 66. The side plate 66 is the first flywheel 1
It is fixed to the front end surface of 2 with a bolt 70. Furthermore, a ring gear 72 is fixed to the outer periphery of the outer periphery 56.

Therefore, the second flywheel 50 is rotatable over the rotation range of the elastic support mechanism 58 in the circumferential direction, and slides in the axial direction while being urged backward by the spring force of the cone spring 60. It is set up freely.

A friction damping mechanism 74 is provided between the inner peripheral portion 54 and the flange portion 36 of the clutch disk 22. The friction damping mechanism 74 includes a connecting bolt 76,
It is composed of an annular plate 78, a friction facing 80, and the like. First, the connecting bolt 76 passes through a window hole 82 of the first flywheel 12, and the connecting bolt 76 passes through the window hole 82 which is opened in a substantially arc shape over a predetermined rotation angle range. It is rotatably provided with respect to the flywheel 12.

A threaded portion 76a of the connecting bolt 76 is screwed into the inner peripheral portion 54. A substantially annular annular plate 78 is fixed to the rear end surface of the connecting bolt 76 with screws 79, and a friction facing 80 faces a pressure contact surface 78a of the annular plate 78 in a manner that can be freely interrupted. The rear end surface of the friction facing 80 is fixed to the outer periphery of the flange portion 36 by, for example, adhesive, so that the friction facing 80 slides integrally with the clutch disk 22.

Therefore, in the friction damping mechanism 74, when the clutch disk 22 slides forward and the clutch is engaged, the friction facing 80 comes into pressure contact with the pressure contact surface 78a.
When the clutch is disengaged, in which the clutch disk 22 returns to the rear, the friction facing 80 is separated from the pressure contact surface 78a. The friction damping mechanism 74 is described in detail in the aforementioned Japanese Patent Application No. 60-44298 (Japanese Unexamined Patent Publication No. 61-201948).

Between the inner peripheral portion 54 and the first flywheel 12 near the radially inner side of the friction damping mechanism 74,
A friction material 84, which is the gist of the present invention, is provided. The front end surface of the annular friction material 84 is the inner peripheral portion 54
The friction member 84 is fixed to the inner circumferential portion of the rear end surface by, for example, adhesive, and the rear end surface of the friction material 84 faces the inner circumferential portion of the front end surface of the first flywheel 12 in an intermittent manner.

Therefore, when the clutch is engaged, in which the entire second flywheel 50 is pushed forward by the friction damping mechanism 74, the second flywheel 50 slides forward against the spring force of the cone spring 60, reducing the friction. The rear end surface of the material 84 is the first flywheel 1
When the clutch is disengaged, the second flywheel 5 separates from the second flywheel 5 and the biasing force by the friction damping mechanism 74 is removed.
0 slides rearward by the spring force of the cone spring 60, and the friction material 84 is attached to the first flywheel 12.
The first flywheel 12 and the inner peripheral part 54 are pressed together.
A frictional force is generated between the two.

Note that the friction material 84 is not limited to being glued to the inner circumferential portion 54, but is attached to the first flywheel 1 so as to create a gap on both sides of the friction material 84 when the clutch is connected.
It is also possible to hold a friction material 84 between the inner peripheral portion 54 and the inner peripheral portion 54 .

Next, the action will be explained. When the clutch is engaged, the pressure plate 24 is pressed forward by the spring force of the diaphragm spring 26, and the friction facing 30 is pressed between the pressure plate 24 and the pressure contact surface 28. In this state, the entire clutch disk 22 also slides forward, and the friction facing 80 fixed to the flange portion 36 is pressed against the pressure contact surface 78a of the annular plate 78.

When the pressing surface 78a is pushed forward, the pressing force is transmitted to the inner peripheral portion 54 via the connecting bolt 76, and the second
The entire flywheel 50 is a cone spring 60
The friction material 84 slides forward against the spring force, and the friction material 84 separates from the front end surface of the first flywheel 12, so that no friction force is generated in the friction material 84. Therefore, the first
Rotational vibrations such as torque fluctuations input to the flywheel 12 are damped by hysteresis torque generated when the friction facing of the friction damping mechanism 74 comes into pressure contact with the pressure contact surface 78a.

Further, the outer circumferential portion 56 of the second flywheel 50 is connected to the output shaft 48 via a friction damping mechanism 74 and the clutch disk 22, and acts as an inertial mass of the output shaft 48, and especially vibrations of the inner circumferential portion 54 at high rotational speeds. Effective in prevention. Furthermore, since the mass Id of the outer peripheral portion 56 is elastically supported by the elastic support mechanism 58, the vibration damping effect is high.

When the clutch is disconnected, pressure plate 2
4 returns to the rear, and the clutch disk 22 also slides rearward. In this state, the friction facing 80 of the friction damping mechanism 74 is separated from the pressure contact surface 78a,
Naturally, no force is generated that pushes the inner peripheral portion 54 forward.
When the biasing force of the inner peripheral portion 54 by the friction damping mechanism 74 is removed, the entire second flywheel 50 is pushed backward by the spring force of the cone spring 60 and slides, and the friction material 84 is pressed against the first flywheel 12. It will be done.

Therefore, when the clutch is disengaged when the hysteresis torque by the friction damping mechanism 74 does not act on the second flywheel 50, the frictional force by the friction material 84 acts, preventing the outer peripheral portion 56 of the second flywheel 50 from swinging significantly. be done.

(Effects of the invention) As explained above, in the flywheel assembly according to the invention, the inner circumferential portion of the first flywheel 12 where the clutch disk 22 is intermittent is fixed to the rear end portion 10 of the crankshaft of the engine, and the first A second flywheel 50 is rotatably provided along the end surface of the flywheel 12 opposite to the clutch disk, and this second flywheel 50 and the clutch disk 2
A friction damping mechanism 74 is provided between the two flywheels 1 and 2, which connects the two only when the clutch is connected.
A friction material 84 that generates a friction force between both flywheels when the clutch is disengaged when the friction damping mechanism 74 does not work is interposed between the flywheels 2 and 50, so that the following effects are achieved.

Conventionally, the outer peripheral portion 56 of the second flywheel 50
When disengaging the clutch, where there is a risk of large vibrations,
The inner circumferential portion 54 of the second flywheel 50 is moved rearward by the spring force of the cone spring 60 so that the friction material 84 interposed between the inner circumferential portion 54 and the first flywheel 12 is pressed against the first flywheel 12. The outer peripheral portion 56 of the second flywheel 50 can be prevented from swinging due to the frictional force exerted by the friction material 84.

Moreover, in the past, for example, Japanese Patent Application No. 60-44298 (Japanese Unexamined Patent Publication No. 61
-201948 Publication) etc., it is possible to prevent the outer peripheral portion 56 from swinging when the clutch is disconnected without increasing the number of parts, and the structure does not become complicated.

[Brief explanation of the drawing]

The drawing is a partial vertical sectional view showing a clutch employing the present invention. 10... Rear end of crankshaft, 12
...First flywheel, 22...Clutch disk, 48...Output shaft, 50...Second flywheel, 56...Outer periphery, 60...Cone spring, 74...Friction damping mechanism, 84...Friction Material.

Claims (1)

[Scope of utility model registration request] A first flywheel fixed to the crankshaft of the engine and in pressure contact with a clutch disk, and a second flywheel of a predetermined mass provided concentrically with the first flywheel.
In a flywheel assembly having a flywheel, the inner peripheral part of the first flywheel where the clutch disk is intermittent is fixed to the end of the crankshaft of the engine, and the inner peripheral part of the first flywheel where the clutch disk is intermittent is fixed to the end of the crankshaft of the engine. Two flywheels are provided rotatably, a friction damping mechanism is provided between the second flywheel and the clutch disk to connect the two only when the clutch is connected, and a friction damping mechanism is provided between the two flywheels in which the friction damping mechanism does not work. A flywheel assembly characterized by interposing a friction material that generates a frictional force between both flywheels during cutting.