Device for filtering rotation and transmission vibrations for motor vehicle comprising same

• US 20040176171A1
• Filed: 02/17/2004
• Published: 09/09/2004
• Est. Priority Date: 05/04/2001
• Status: Active Grant

• Current Assignee: Valeo Embrayages (Valeo SE)
• Original Assignee: Valeo Embrayages (Valeo SE)
• Inventors: Clausin, Jacques
• Granted Patent: US 7,347,122 B2
• Time in Patent Office: Days
• US Class Current: 464/2
• CPC Class Codes: F16F 15/18 using electric, magnetic or electromagnetic means suppression of vibrations of rotating systems by use of non-rotating magnetic or electromagnetic means F16F15/03; dynamo-electric devices H02K; control effected upon generator excitation circuit to reduce harmful effects of overloads or transients H02P9/10
• CPC Class Codes: Y10T 74/2127 with electrical or magnetic damping

Abstract

The invention concerns a filtering device for filtering vibrations transmitted by a rotating engine component (11) adapted to drive in rotation an output shaft (19), which device comprises a drive shaft damper (20) tuned at a frequency substantially locked within a range of frequencies to be damped: electromagnetic modulating means (23) are designed to adapt the frequency of the damper (20) to the frequency of the vibrations transmitted by the rotary component (11). The invention also concerns a transmission for motor vehicle comprising a drive shaft (11), linked to a rotary component formed by the motor vehicle engine crankshaft, an output shaft (19) linked to the drive shaft releasable via a clutch, a gearbox (50), said output shaft (19) being the input shaft of the gearbox (50), a filtering device of the inventive type being provided for filtering vibrations emitted, hence transmitted, by the rotary component.

Claims

1. A filtering device for filtering out vibrations transmitted by a rotating power component (11, 111) adapted to drive in rotation an output shaft (19, 119, 219), which device comprises a drive shaft damper (20, 120, 220) tuned to a frequency which is substantially inside the range of frequencies to be damped out, characterised by the fact that modulating means of the electromagnetic type are provided for the purpose of matching the frequency of the damper (20, 120, 220) to the frequency of the vibrations transmitted by the rotating component (11, 111).

2. A filtering device according to claim 1, characterised by the fact that the damper (20, 120, 220) comprises a rotor (21, 121, 221) consisting of a mass which is mounted elastically on the output shaft (19, 119, 219) and associated with a stator (126, 226), the modulating means comprising electromagnetic means (23, 123, 223-127, 227) carried by the rotor (21, 121, 221) and the stator (126, 226).

3. A filtering device according to claim 2, characterised by the fact that the electromagnetic means comprise magnets (127, 227) defining a succession of poles carried by the rotor (21, 121, 221) and coils (23, 123, 223) carried by the stator (126, 226) and defining a succession of poles disposed in line with the magnets (127, 227).

4. A filtering device according to claim 3, characterised by the fact that the coils (123, 223) are disposed axially in line with the magnets (127, 227).

5. A filtering device according to claim 3, characterised by the fact that the coils (23) are disposed radially in line with the magnets.

6. A filtering device according to one of claims 2 to 5, characterised by the fact that the rotor is in the form of a disc (21, 121, 221) or is frustoconical or cylindrical.

7. A filter device according to one of claims 3 to 6, characterised by the fact that the magnets (127, 227) are held in position radially by a counter-centrifugal radial retaining hoop (132).

8. A filtering device according to one of claims 1 to 7, characterised by the fact that it includes a vibration sensor adapted to measure the amplitude of the vibration to be damped out.

9. A filtering device according to one of claims 3 to 5 taken together with claim 8, characterised by the fact that means are provided for supplying current to the coils (23, 123, 223) of the electromagnetic means, the said supply being responsive to the result of the measurement of amplitude performed by the vibration sensor, whereby to create in the damper (20, 120, 220) a torque equal and opposite to that created by the said amplitude.

10. A filtering device according to one of claims 1 to 9, characterised by the fact that it comprises a main vibration damper disposed on the output shaft upstream of the damper.

11. A transmission for a motor vehicle of the type comprising a drive shaft (11, 111), coupled to a rotary component consisting of the crankshaft of the engine of the motor vehicle, an output shaft (19, 119, 219) coupled to the drive shaft releasably through a clutch, a gearbox (50), the said output shaft (19, 119, 219) being the input shaft of the gearbox (50), a filtering device being provided for filtering out vibrations emitted, and therefore transmitted, by the rotary component, characterised by the fact that the filtering device is a filtering device in accordance with one of claims 1 to 10.

12. A transmission according to claim 11, characterised by the fact that the clutch comprises a reaction plate (12, 112B), which is coupled directly or otherwise to the rotary component, a pressure plate (14, 114) which is coupled in rotation to the reaction plate (12, 112B) but displaceable axially with respect thereto, the two plate, namely the reaction plate (12, 112B) and pressure plate (14, 114), being adapted to clamp between them, under the action of axially acting resilient means (15), friction liners carried by a friction disc (16, 116) at its outer periphery, the said friction disc (16, 116) having a hub (17, 117) which is mounted in rotation on the output shaft (19, 119, 219).

13. A transmission according to claim 12, characterised by the fact that the friction disc (16) comprises a torsion damper which constitutes the main damper.

14. A transmission according to claim 12, characterised by the fact that the reaction plate (112B) constitutes the secondary part of a two-part flywheel (112), the other part of which, namely the primary part (112A), is coupled to the rotary component (111), the two parts (112A, 112B) being coupled elastically for rotation together (118).

15. A transmission according to one of claims 11 to 14, characterised by the fact that control of disengagement of the clutch is carried out electrically, the gearbox (50) is a so-called automated gearbox, gear changes being controlled by a computer (24) which takes into account, in particular, information delivered by a sensor (53) as to the speed of the input shaft (19) of the gearbox (50), and by a sensor (54) as to the speed of the output shaft (51) of the gearbox (50), firstly after the clutch is disengaged, and secondly after the damper (20) has been tuned to the speed of the input shaft (19) of the gearbox (50), having regard to the new gear ratio to be engaged.

16. A transmission according to one of claims 11 to 15, characterised by the fact that the damper (20, 120, 220) is used as an electric motor and controlled in such a way as to supply an additional driving torque on the output shaft (19, 119, 219), besides that which is supplied by the engine (10) of the vehicle.

17. A transmission according to one of claims 11 to 15, characterised by the fact that the damper (20) is used as an energy recuperator during braking.

18. A transmission according to claim 17, characterised by the fact that the clutch (58) is disengaged during the energy recuperation phase.

19. A transmission according to claim 18, characterised by the fact that the gear ratios are changed down.