Centrifugal pendulum and clutch disc having the latter

Abstract

A centrifugal pendulum and a clutch disk with a pendulum flange provided thereon, rotational about an axis of rotation, and several pendulum weights distributed over the circumference and received on the pendulum flange in a pivotal fashion. In order to at least reduce noise development due to mass momentum of inertia acting here caused by the centrifugal pendulum, the pendulum flange is received on a rotational part, rotating on an axis of rotation, and a friction clutch is effectively arranged between the pendulum flange and said part.

Claims

1. A centrifugal pendulum, comprising a pendulum flange, rotational about an axis of rotation, with several pendulum weights, distributed over a circumference thereof and received pivotally on the pendulum flange, the pendulum flange received on an output hub, rotational about an axis of rotation, and a friction clutch is arranged directly between the pendulum flange and the output hub, the friction clutch includes a flat spring having a first end engaged directly against the output hub and a second end engaging a recess of the pendulum flange, the recess of the pendulum flange is a through hole that extends axially through the pendulum flange.

2. The centrifugal pendulum of claim 1, wherein the recess is spaced radially outwardly from the output hub.

3. The centrifugal pendulum of claim 1, wherein the flat spring includes a substantially radially extending portion including the first end, and a partially axially extending portion including the second end, wherein the substantially radially extending portion is positioned outside of the recess and the partially axially extending portion is at least partially located inside the recess.

4. A clutch disk comprising an input part carrying friction coatings and an output hub as well as at least one damper arranged between the input part and the output hub, and a centrifugal pendulum arranged axially distanced from the at least one damper, with a pendulum flange centered on the output hub and several pendulum weights pivotally located on the pendulum flange, distributed over a circumference thereof, and a friction clutch arranged directly between the pendulum flange and the output hub, the friction clutch includes a flat spring having a first end engaged directly against the output hub and a second end engaging a recess of the pendulum flange, the recess of the pendulum flange is a through hole that extends axially through the pendulum flange.

5. The clutch disk according to claim 4, wherein the friction clutch includes friction surfaces arranged on the output hub and the pendulum flange, forming a frictional engagement.

6. The clutch disk according to claim 5, wherein an annular collar with a friction area is integrated in one piece at the output hub.

7. The clutch disk according to claim 6, wherein the pendulum flange is pre-stressed against the output hub opposite an effect of the flat spring.

8. The clutch disk according to claim 7, wherein the flat spring rests on a bearing integrated in one piece with the output hub.

9. The clutch disk according to claim 8, wherein the flat spring is suspended on the pendulum flange in a torque-proof fashion.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in greater detail based on the exemplary embodiment shown in FIGS. 1 and 2. Shown are:

(2) FIG. 1 a cross-section detail of a clutch disk with a centrifugal pendulum, which can be disengaged by a friction clutch, and

(3) FIG. 2 a diagram of the principle of the clutch disk of FIG. 1 with a two-stage torsion vibration damper and a centrifugal pendulum switched parallel thereto.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(4) FIG. 1 shows the upper part of the clutch disk 1, arranged about the rotary axis 4, with the centrifugal pendulum 2 and the rotational vibration damper 3. The input part 5 of the clutch disk 1 is formed from the disk part 7, supporting the friction coatings 6 and impinging with the disk part 8 the energy storage 10 of the damper stage 9 of the primary damper, the output part 11 is formed by the hub 13. The flange 12 is geared via the teeth 15 with torsional play to the part 14 embodied as a hub 13, with the second damper stage 16 of the idling damper, its energy storage 17 between the flange 12 and the cam 18 geared directly to the hub 13 being stressed via its rotation angle. The energy storage units 10 are stressed between the input part 5 and the cam 18.

(5) The centrifugal pendulum 2 is received on the part 14, such as the hub 13, rotational via the friction clutch 19, upon overcoming the friction moment provided by the friction clutch 19. For this purpose the pendulum flange 20, at which at both sides, distributed over the circumference, the pendulum weights 21 are accepted, pivotal via the moving rollers 24 in the sections 22, 23 of the pendulum flange 20 and the pendulum weights 21, via the friction surface 25 forming a frictional engagement with the friction surface 26 of the annular collar 27 embodied in one piece with the hub 13. The pre-stressing is performed by the energy storage unit 28, embodied as a flat spring 29, which is supported at the support collar 30 provided at the hub 13 and engages the recesses 32 via the fingers 31 and thus is connected to the pendulum flange 20 in a torque-proof fashion and glides along the support collar 30 when the friction moment of the friction clutch 19 has been overcome.

(6) The recess of the pendulum flange can be a through hole that extends axially through the pendulum flange.

(7) The centrifugal pendulum 2 is switched parallel in reference to the torsional vibration damper 3 and compensates vibrations according to the rotation when the friction clutch 19 is not active. When the friction clutch is disengaged, the mass moment of inertia of the centrifugal pendulum 2 is coupled to the transmission input shaft connected via the internal gear 33 to the hub 13 in a torque-proof fashion. In order to uphold the effectiveness of the second damping stage 16 of the torsional vibration damper 3, on the one hand, and to interrupt on the other hand any noise induced in the transmission by the mass moment of inertia of the centrifugal pendulum 2, said centrifugal pendulum 2 is engaged via the friction clutch 19 when the momentum capacity of the damping stage 16 exceeds the mass moments of inertia.

(8) FIG. 2 shows in a schematic illustration the circuit of the clutch disk 1 with at the driving side the tensile moment M(A), introduced for example by an internal combustion engine showing torsional vibrations upon the input part 5, and the moment M(D) guided out, damping the clutch disk 1 at the output part 11. The rotational vibration dampers 3 and parallel thereto, via the hub 13 (FIG. 1) the centrifugal pendulum 2, which can be disengaged via the friction clutch 19, act between the input part 5 and the output part 11. The torsional vibration damper 3 includes the damper stages 9, 16 with the energy storage units 10, 17 comprising the spring capacities C1, C2 and the compression angles 1, 2, as well as the friction devices 34, 35 with the friction hysteresis H1, H2. The friction device 36 with the friction hysteresis H3 is switched over the entire angle of distortion between the input part 5 and the hub 13. Due to the higher stiffness of the energy storage units 10, at low moments, first the energy storage units 17 of the damper stage 16 are active. Upon an acute change of moments the friction moment M(R) of the friction clutch 19 is exceeded and the centrifugal pendulum 2 is disengaged.

LIST OF REFERENCE CHARACTERS

(9) 1 Clutch disk

(10) 2 Centrifugal pendulum

(11) 3 Torsional vibration damper

(12) 4 Axis of rotation

(13) 5 Input part

(14) 6 Friction coating

(15) 7 Disk part

(16) 8 Disk part

(17) 9 Damper stage

(18) 10 Energy storage

(19) 11 Output part

(20) 12 Flange

(21) 13 Hub

(22) 14 Part

(23) 15 Gearing

(24) 16 Damper stage

(25) 17 Energy storage

(26) 18 Cam

(27) 19 Friction clutch

(28) 20 Pendulum flange

(29) 21 Pendulum weight

(30) 22 Recess

(31) 23 Recess

(32) 24 Roller

(33) 25 Friction area

(34) 26 Friction area

(35) 27 Annular collar

(36) 28 Energy storage unit

(37) 29 Flat spring

(38) 30 Bearing

(39) 31 Fingers

(40) 32 Recess

(41) 33 Internal gearing

(42) 34 Friction device

(43) 35 Friction device

(44) 36 Friction device

(45) C1 Spring capacity

(46) C2 Spring capacity

(47) H1 Friction hysteresis

(48) H2 Friction hysteresis

(49) H3 Friction hysteresis

(50) M(A) Tensile moment

(51) M(D) Moment

(52) M(R) Friction moment

(53) 1 Compression angle

(54) 2 Compression angle