Mechanism for filtering torque fluctuations of a secondary member

Patent metadata

Field	Value
Publication number	US-2016252156-A1
Application number	US-201415032575-A
Country	US
Kind code	A1
Filing date	Oct 31, 2014
Priority date	Oct 31, 2013
Publication date	Sep 1, 2016
Grant date	—

Abstract

A filtering mechanism for torque fluctuations is interposed between a crankshaft of an internal combustion engine and a transmission. This mechanism comprises a rotating member to be damped, an oscillating inertial flywheel rotating around the axis of revolution, and pivot-mounted modules allowing angular deflection of the oscillating inertial flywheel with respect to the member to be damped. The modules each have at least one oscillating arm pivoting radially with respect to the member to be damped and a kinematic connecting member between the oscillating arm and the oscillating inertial flywheel. When the mechanism rotates centrifugal forces on the oscillating arm produce a counteracting torque that tends to return the oscillating inertial flywheel and the member to be damped toward the equilibrium position. The counteracting torque increases with the rotation speed of the filtering mechanism and with the amplitude of the angular deflection.

First claim

1 . A filtering mechanism for torque fluctuations, interposed between a crankshaft of an internal combustion engine rotating around an axis of revolution ( 100 ) and a transmission, comprising a member to be damped ( 14 , 114 , 214 , 15 ) rotating around the axis of revolution ( 100 ), an oscillating inertial flywheel ( 22 , 122 , 222 ) rotating around the axis of revolution ( 100 ) with respect to the member to be damped ( 14 , 114 , 214 ), and pivot-mounted modules ( 26 , 126 , 226 ) allowing an angular deflection, on either side of an equilibrium position, of the oscillating inertial flywheel ( 22 , 122 , 222 ) with respect to the member to be damped ( 14 , 114 , 214 ), the pivot-mounted modules ( 26 , 126 , 226 ) each having at least one oscillating arm ( 26 . 1 , 226 . 1 ) pivoting radially with respect to the member to be damped and a kinematic connecting member ( 26 . 4 , 226 . 4 , 26 . 40 ) between the oscillating arm ( 26 . 1 , 226 . 1 ) and the oscillating inertial flywheel ( 22 , 122 , 222 ), positioned so that when the mechanism rotates around the axis of revolution ( 100 ), the centrifugal forces on the oscillating arm ( 26 . 1 , 226 . 1 ) produce on the member to be damped ( 14 , 114 , 214 , 15 ) a counteracting torque that tends to return the oscillating inertial flywheel ( 22 , 122 , 222 ) and the member to be damped ( 14 , 114 , 214 ) toward the equilibrium position, the counteracting torque increasing with the rotation speed of the filtering mechanism and with the amplitude of the angular deflection,
wherein the filtering mechanism furthermore has a primary member interposed kinematically ( 12 , 112 , 212 ) between the crankshaft and the member to be damped ( 14 , 114 , 214 ), the member to be damped constituting a secondary member rotating around the axis of revolution ( 100 ) with respect to the primary member ( 12 , 112 , 212 ).

2 . The filtering mechanism according to claim 1 , wherein it has means for coupling the oscillating inertial flywheel to the secondary member when the rotation speed of the mechanism exceeds a predetermined threshold.

3 . The filtering mechanism according to claim 1 , wherein each oscillating arm ( 26 . 1 , 226 . 1 ) is arranged facing a corresponding stop ( 28 , 228 ) in order to limit the outward radial motion of each oscillating arm ( 26 . 1 , 226 . 1 ).

4 . The filtering mechanism according to claim 3 , wherein the stop ( 28 , 228 ) is integral with the oscillating inertial flywheel ( 22 , 122 , 222 ).

5 . The filtering mechanism according to claim 1 , wherein it has elastic return elements ( 16 , 116 , 216 ) in order to return the secondary member ( 14 , 114 , 214 ) toward a reference angular position with respect to the primary member ( 12 , 112 , 212 ).

6 . The filtering mechanism according to claim 1 , wherein one of the primary member ( 12 , 112 , 212 ) and secondary member ( 14 , 114 , 214 ) comprises a web ( 14 . 1 , 112 . 1 , 214 . 1 ), and the other of the primary and secondary members comprises two guide washers ( 12 . 1 , 12 . 2 , 114 . 1 , 114 . 2 , 212 . 1 , 212 . 3 ) fastened to one another and located axially on either side of the web ( 14 . 1 , 112 . 1 , 214 . 1 ).

7 . The filtering mechanism according to claim 1 , wherein the primary member ( 12 , 112 , 212 ) has an interface ( 12 . 4 ) for fastening to the crankshaft.

8 . The filtering mechanism according to claim 1 , wherein the primary member ( 12 , 112 , 212 ) or the secondary member ( 14 , 114 , 214 ) is integral with friction surfaces ( 30 , 112 . 2 , 212 . 2 ) of a friction clutch ( 29 , 110 , 210 ).

9 . The filtering mechanism according to claim 1 , wherein the oscillating inertial flywheel ( 22 , 122 , 222 ) is rotationally guided by a bearing ( 24 , 124 , 224 ) installed on the primary member ( 12 , 112 , 212 ) or the secondary member ( 14 , 114 , 214 ) or on a part, in particular a hub ( 214 . 3 ) or a collar, integral with the primary member ( 12 , 112 , 212 ) or with the secondary member ( 14 , 114 , 214 ).

10 . The filtering mechanism according to claim 1 , wherein the secondary member ( 14 , 114 , 214 ) has a connecting interface ( 114 . 3 , 214 . 3 ) to an input shaft ( 150 , 250 ) of the transmission.

11 . The filtering mechanism according to claim 1 , wherein the pivot-mounted modules ( 26 , 126 , 226 ) are symmetrical pairwise with respect to the axis of revolution ( 100 ) and are preferably symmetrical pairwise with respect to a plane of symmetry containing the axis of revolution ( 100 ).

12 . The filtering mechanism according to claim 1 , wherein the pivot-mounted modules ( 26 , 126 , 226 ) are arranged axially between the oscillating inertial flywheel ( 22 , 122 , 222 ) and the primary member ( 12 , 112 , 212 ), and/or between the secondary member ( 14 , 114 , 214 ) and the primary member ( 12 , 112 , 212 ), and/or inside a receptacle of the primary member ( 12 , 112 , 212 ).

13 . The filtering mechanism according to claim 1 , wherein the kinematic connecting member ( 26 . 4 , 26 . 40 ) has at least one rolling body ( 26 . 4 ), preferably a roller.

14 . The filtering mechanism according to claim 1 , wherein the oscillating arm ( 26 . 1 ) pivots around a pivot axis ( 200 ) with respect to the member to be damped ( 15 , 114 ), the rolling body ( 26 . 4 ) having a rotation axis parallel to the pivot axis ( 200 ).

15 . The filtering mechanism according to claim 13 , wherein the rolling body ( 26 . 4 ) rolls on a rolling track ( 26 . 5 ) formed on the oscillating arm ( 26 . 1 ) and on a rolling track ( 26 . 6 ) formed on the oscillating inertial flywheel ( 22 ).

16 . The filtering mechanism according to claim 1 , wherein the kinematic connecting member has a connecting link ( 26 . 4 , 226 . 4 ) between the oscillating arm ( 26 . 1 , 226 . 1 ) and the oscillating inertial flywheel ( 22 , 122 , 222 ).

17 . The filtering mechanism according to claim 4 , wherein the kinematic connecting member is a connecting link ( 26 . 4 , 226 . 4 ) between the oscillating arm ( 26 . 1 , 226 . 1 ) and the oscillating inertial flywheel ( 22 , 122 , 222 ), the oscillating arm ( 26 . 1 , 226 . 1 ) pivots with respect to the secondary member ( 14 , 114 , 214 ) around a first pivot axis ( 26 . 3 , 226 . 3 ), the link ( 26 . 4 , 226 . 4 ) pivots around the oscillating arm ( 26 . 1 , 226 . 1 ) around a second pivot axis ( 26 . 6 , 226 . 6 ) and with respect to the oscillating inertial flywheel ( 22 , 122 , 222 ) around a third pivot axis ( 26 . 8 , 226 . 8 ), the first, second, and third pivot axes being arranged in such a way that at rest, the distance between the oscillating arm ( 26 . 1 , 226 . 1 ) and the corresponding stop ( 28 , 228 ) passes through a non-zero minimum when the second pivot axis ( 26 . 6 , 226 . 6 ), the third pivot axis ( 26 . 8 , 226 . 8 ), and the axis of revolution ( 100 ) are positioned in one radial plane.

18 . A mechanical assemblage having a filtering mechanism according to claim 1 and a single or dual friction clutch ( 29 , 112 , 212 ) having a friction surface ( 30 , 112 . 2 , 212 . 2 ) integral with the primary member or with the secondary member.

19 . The mechanical assemblage according to claim 18 , wherein the friction surface ( 30 ) is located axially at a distance from the secondary member and is coupled to the secondary member by means of a connecting part.

20 . The mechanical assemblage according to claim 17 , wherein the filtering mechanism i

Assignees

• Valeo Embrayages

Inventors

• Boulet Jerome
• Fleche Benoit
• Fenioux Daniel
• Cailleret Franck
• Lauridsen Carsten
• Verhoog Roel
• Marechal Olivier
• Mahe Herve

Classifications

• F16H45/02

  with mechanical clutches for bridging a fluid gearing of the hydrokinetic type (control of torque converter lock-up clutches F16H61/14) · CPC title

• F16F15/13128 Primary

  the damping action being at least partially controlled by centrifugal masses (flywheels characterised by means to vary the moment of inertia F16F15/31) · CPC title

• F16D3/12

  specially adapted for accumulation of energy to absorb shocks or vibration (by making use of fluid elements F16D3/80) · CPC title

• F16F15/13157

  with a kinematic mechanism or gear system, e.g. planetary (F16F15/13128 takes precedence) · CPC title

• F16H2045/0226

  comprising two or more vibration dampers · CPC title