IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0190164
(2008-08-12)
|
등록번호 |
US-8151965
(2012-04-10)
|
우선권정보 |
DE-10 2007 038 156 (2007-08-13) |
발명자
/ 주소 |
- Linortner, Thomas
- Parigger, Martin
- Kaimer, Simon
- Gratzer, Franz
|
출원인 / 주소 |
- MAGNA Powertrain AG & Co KG
|
대리인 / 주소 |
Harness, Dickey & Pierce, P.L.C.
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
15 |
초록
▼
A clutch arrangement having an input element and an output element that are rotatable relevant to one another, a friction clutch and a pump. The friction clutch couples the input element with the output element in dependence on a hydraulic pressure in a pressure space of the clutch arrangement. The
A clutch arrangement having an input element and an output element that are rotatable relevant to one another, a friction clutch and a pump. The friction clutch couples the input element with the output element in dependence on a hydraulic pressure in a pressure space of the clutch arrangement. The pump has a first pump part that is rotationally fixedly connected to the input element and a second pump part that is rotationally fixedly connected to the output element. The pump may be driven by a rotary movement of the input element and the output element relative to one another, with a pressure side of the pump being connected to the pressure space. An orifice having a substantially temperature independent leakage characteristic is arranged in a leakage line that leads from the pressure space to a low pressure space and which extends parallel to the pump.
대표청구항
▼
1. A clutch arrangement responsive to a speed difference for the transmission of torque in a powertrain of a motor vehicle, comprising: an input element and an output element that are rotatable relative to one another;a friction clutch that couples the input element to the output element based on a
1. A clutch arrangement responsive to a speed difference for the transmission of torque in a powertrain of a motor vehicle, comprising: an input element and an output element that are rotatable relative to one another;a friction clutch that couples the input element to the output element based on a hydraulic pressure that prevails in a pressure space;a pump with a first pump part that is rotationally fixedly connected to the input element and a second pump part that is rotationally fixedly connected to the output element, wherein the pump is driven by rotation of the input element and the output element relative to one another, a suction side of the pump being connected to a low pressure space, and a pressure side of the pump being connected to the pressure space; andan orifice with a substantially temperature independent leakage characteristic arranged at a leakage line that leads from the pressure space to the low pressure space and extends parallel to the pump, the orifice having a leakage rate that approximately corresponds to a leakage rate of the pump at an operating temperature. 2. The clutch arrangement in accordance with claim 1, wherein the orifice has an opening passage which has an inner diameter in a range from approximately 0.4 mm to 0.8 mm and a length in a range from approximately 0.2 mm to 0.5 mm. 3. The clutch arrangement in accordance with claim 1, wherein the orifice is formed by one of a bore in a disk which is inserted into the leakage line and a bore in a base section of a beaker-shaped insert which is inserted into the leakage line. 4. The clutch arrangement in accordance with claim 1, wherein the orifice is arranged in a stationary housing. 5. The clutch arrangement in accordance with claim 1, further comprising a drain line that leads from the pressure space to the low pressure space and extends parallel to the leakage line, and at which a controllable drain valve is arranged for opening or closing the drain line. 6. The clutch arrangement in accordance with claim 5, further comprising a control device that opens the drain valve to set a first clutch characteristic (K1); and closes the drain valve to set a second clutch characteristic (K2) which is steeper than the first clutch characteristic. 7. The clutch arrangement in accordance with claim 5, further comprising a switch valve arranged at the leakage line in series with the orifice to open or close the leakage line, and wherein a control device opens the drain valve to set a first clutch characteristic (K1); closes the drain valve and opens the switch valve to set a second clutch characteristic (K2) which is steeper than the first clutch characteristic; andcloses the drain valve and the switch valve to set a third clutch characteristic (K3) which is steeper than the second clutch characteristic. 8. The clutch arrangement in accordance with claim 7, wherein the control device first opens the switch valve to effect a transition from the third clutch characteristic (K3) to the second clutch characteristic (K2); and only then opens the drain valve to effect a transition from the second clutch characteristic (K2) to the first clutch characteristic (K1), to open the friction clutch starting from a state in which the drain valve and the switch valve are closed. 9. The clutch arrangement in accordance with claim 7, wherein the control device first closes the drain valve when a speed difference between the input element and the output element exceeds a first threshold value or when another first switching criterion is satisfied; and then closes the switch valve when a speed difference between the input element and the output element exceeds a second threshold value that is higher than the first threshold value or when another second switching criterion is satisfied, to set a stiff clutch characteristic starting from a state in which the drain valve and the switch valve are open. 10. The clutch arrangement in accordance with claim 1, further comprising an excess pressure line at which an excess pressure valve is arranged that extends from the pressure space to the low pressure space. 11. The clutch arrangement in accordance with claim 1, further comprising a switch valve arranged at the leakage line in series with the orifice for opening or closing the leakage line. 12. The clutch arrangement in accordance with claim 11, further comprising a control device that opens the switch valve to set a temperature compensated clutch characteristic; and closes the switch valve to set a steeper clutch characteristic than with the open switch valve. 13. A clutch arrangement for use in a motor vehicle having a drive unit, a primary axle permanently driven by the drive unit, and a secondary axle selectively coupled to the drive unit via the clutch arrangement responsive to a speed difference, the clutch arrangement comprising: an input element and an output element that are rotatable relative to one another;a friction clutch that couples the input element to the output element in dependence on a hydraulic pressure which prevails in a pressure space;a pump having a first pump part that is rotationally fixedly connected to the input element and a second pump part that is rotationally fixedly connected to the output element, wherein the pump is driven by rotation of the input element and the output element relative to one another, with a suction side of the pump being connected to a low pressure space, and a pressure side of the pump being connected to the pressure space; andan orifice with a substantially temperature independent leakage characteristic arranged at a leakage line that leads from the pressure space to the low pressure space and extends parallel to the pump, wherein the orifice is sized and shaped to generate turbulent flow therethrough. 14. The clutch arrangement of claim 13 further including a drain line extending from the pressure space to the low pressure space in parallel to the leakage line and a drain valve operable to selectively open and close the drain line. 15. The clutch arrangement of claim 14 further including a switch valve arranged at the leakage line in series with the orifice to open or close the leakage line, and wherein a control device opens the drain valve to set a first clutch characteristic (K1); closes the drain valve and opens the switch valve to set a second clutch characteristic (K2) which is steeper than the first clutch characteristic; andcloses the drain valve and the switch valve to set a third clutch characteristic (K3) which is steeper than the second clutch characteristic. 16. A drive axle assembly including first and second rotatable members, comprising: a differential gear;a clutch selectively drivingly coupling the first and second rotatable members to transfer torque to the differential gear based on a hydraulic pressure in a pressure space;a pump with a first pump part that is rotationally fixedly connected to the first member and a second pump part that is rotationally fixedly connected to the second member,wherein the pump is driven by rotation of the first member relative to the second member, a suction side of the pump being connected to a low pressure space, and a pressure side of the pump being connected to the pressure space; anda leakage line interconnecting the pressure space and the low pressure space and extending parallel to the pump and including an orifice configured to develop a turbulent flow such that the volume of flow through the orifice is substantially independent of temperature. 17. A clutch arrangement for transferring drive torque in a powertrain of a motor vehicle; comprising: first and second rotary members;a friction clutch operably coupled between the first and second rotary members;a fluid pump operable to pump fluid from a sump to a pressure chamber in response to relative rotation between the first and second rotary members;a piston operable to exert a clutch engagement force on the friction clutch proportional to the fluid pressure in the pressure chamber;a first flow path with a control valve located between the pressure chamber and the sump;a second flow path from the pressure chamber to the sump which is parallel to the first flow path and which includes an orifice configured to generate turbulent flow to provide a leakage rate that is substantially independent of the temperature of the fluid; anda control system for controlling actuation of the control valve. 18. The clutch arrangement of claim 17 further including a third flow path from the pressure chamber to the sump and including a pressure limiting valve that is operable to limit the maximum fluid pressure in the pressure chamber. 19. The clutch arrangement of claim 17 further including a second control valve operably disposed in the second flow path between the orifice and the sump, and wherein the control system is operable to control actuation of the first and second control valves. 20. The clutch arrangement of claim 19 wherein the control system is operable to establish at least three different clutch characteristics indicative of a relationship between the magnitude of the drive torque transferred and the speed differential between the first and second rotary members, wherein a first clutch characteristic is established when the first control valve is opened, wherein a second clutch characteristic is established when the first control valve is closed and the second control valve is opened, and wherein a third clutch characteristic is established when the first and second control valves are both closed. 21. The clutch arrangement of claim 20 wherein the control system is operable to open the second control valve to transition from the third clutch characteristic to the second clutch characteristic and subsequently open the first control valve to transition from the second clutch characteristic to the first clutch characteristic. 22. The clutch arrangement of claim 17 wherein the first rotary member is driven by a source of drive torque associated with the powertrain and the second rotary member drives an input to an axle assembly. 23. A clutch arrangement for transmitting torque in a powertrain of a motor vehicle, comprising: an input element and an output element that are rotatable relative to one another;a friction clutch operable to selectively couple the input element to the output element based on a hydraulic pressure in a pressure space;a pump having a first pump part rotatably driven by the input element and a second pump part rotatably driven by the output element such that the pump is driven in response to relative rotation between the input element and the output element, wherein a suction side of the pump is connected to a low pressure space and a discharge side of the pump is connected to the pressure space;a leakage line between the pressure space and the low pressure space;an orifice with a substantially temperature independent leakage characteristic arranged in the leakage line;a drain line that leads from the pressure space to the low pressure space and extends parallel to the leakage line;a controllable drain valve operable for selectively opening and closing the drain line;a switch valve arranged in the leakage line in series with the orifice and operable to selectively open and close the leakage line; anda control device operable to open the drain valve for setting a first clutch characteristic (K1), to close the drain valve and open the switch valve for setting a second clutch characteristic (K2) which is steeper than the first clutch characteristic, and to close the drain valve and the switch valve for setting a third clutch characteristic (K3) which is steeper than the second clutch characteristic. 24. A clutch arrangement for use in a motor vehicle having a drive unit, a primary axle permanently driven by the drive unit and a secondary axle selectively coupled to the drive unit via actuation of the clutch arrangement, the clutch arrangement comprising: an input element driven by one of the drive unit and the primary axle;an output element driving the secondary axle;a friction clutch operable to selectively couple the input element to the output element in dependence on a hydraulic pressure in a pressure space;a pump having a first pump part rotatably driven by the input element and a second pump part rotatably driven by the output element such that the pump is driven in response to relative rotation between the input element and the output element, wherein a suction side of the pump is connected to a low pressure space and a discharge side of the pump is connected to the pressure space;a leakage line leading from the pressure space to the low pressure space;an orifice with a substantially temperature independent leakage characteristic arranged in the leakage line;a switch valve arranged in the leakage line in series with the orifice and operable to selectively open and close the leakage line;a drain line extending from the pressure space to the low pressure space in parallel to the leakage line and a drain valve operable to selectively open and close the drain line; anda control device which opens the drain valve to set a first clutch characteristic (K1), closes the drain valve and opens the switch valve to set a second clutch characteristic (K2) which is steeper than the first clutch characteristic, and closes the drain valve and the switch valve to set a third clutch characteristic (K3) which is steeper than the second clutch characteristic.
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