Torque coupling with tri-mode overrunning clutch assembly
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16D-011/16
F16D-011/00
출원번호
US-0812382
(2004-03-29)
발명자
/ 주소
Williams,Randolph C.
Williams,Richard H.
Ronk,Aaron
출원인 / 주소
Magna Powertrain, Inc.
대리인 / 주소
Harness, Dickey &
인용정보
피인용 횟수 :
12인용 특허 :
48
초록▼
A controllable, multi-mode, bi-directional overrunning mode clutch and a shift system adapted for use in a power transfer assembly for transferring drive torque from a primary driveline to a secondary driveline so as to establish a four-wheel drive mode. The mode clutch includes a first ring journal
A controllable, multi-mode, bi-directional overrunning mode clutch and a shift system adapted for use in a power transfer assembly for transferring drive torque from a primary driveline to a secondary driveline so as to establish a four-wheel drive mode. The mode clutch includes a first ring journalled on a first rotary member, a second ring fixed to a second rotary member, and a plurality of rollers disposed in opposed cam tracks formed between the first and second rings. The first ring is split to define an actuation channel between its end segments. A cam member is moveable between positions engaged with and released from one or both end segments of the split first ring. The shift system includes a mode fork which controls movement of the cam member for establishing a two-wheel drive mode in addition to on-demand and locked four-wheel drive modes.
대표청구항▼
What is claimed is: 1. A power transfer device for use in a motor vehicle having a powertrain and first and second drivelines, comprising: an input driven by the powertrain; a first output interconnecting said input to the first driveline; a second output connected to the second driveline; a bi-dir
What is claimed is: 1. A power transfer device for use in a motor vehicle having a powertrain and first and second drivelines, comprising: an input driven by the powertrain; a first output interconnecting said input to the first driveline; a second output connected to the second driveline; a bi-directional overrunning mode clutch operably disposed between said first and second outputs, said mode clutch is operable in a first mode to permit relative rotation between said first and second outputs in a first direction and prevent relative rotation therebetween in a second direction, said mode clutch is operable in a second mode to prevent relative rotation between said first and second outputs in both directions, and said mode clutch is operable in a third mode to permit relative rotation between said first and second output in both directions, said mode clutch including a first ring driven by one of said first and second outputs, a second ring operably disposed between said first ring and the other of said first and second outputs, rollers engaging a cam surface formed between said first and second rings, an actuator ring and a drag band operable for exerting a frictional drag force on said actuator ring, said second ring having an actuation slot defining first and second end surfaces and is adapted to index circumferentially relative to said first ring to cause said rollers to engage said cam surface for coupling said second ring to said first ring and said other of said first and second outputs, said actuator ring having a lug retained in said actuation slot, said actuator ring is operable in its first actuator position to permit bi-directional circumferential movement of said lug from a central position disengaged from both of said first and second end surfaces of said actuation slot into engagement with one of said first and second end surfaces, and said actuator ring is operable in its second actuator position to locate said lug in engagement with both of said first and second end surfaces of said actuator slot so as to maintain said lug in its central position, and wherein said actuator ring is normally maintained in its first actuator position by a biasing device; a mode shift mechanism operable in a first mode position to shift said mode clutch into its first mode, in a second mode position to shift said mode clutch into its second mode, and in a third mode position to shift said mode clutch into its third mode; and a shift system for moving said mode shift mechanism to its first mode position to establish an on-demand four-wheel drive mode, to its second mode position to establish a locked four-wheel drive mode, and to its third mode position to establish a two-wheel drive mode. 2. The power transfer device of claim 1 wherein said mode shift mechanism is operable in its first mode position to cause said drag band to exert said drag force on said actuator ring in its first actuator position, wherein said mode shift mechanism is operable in its second mode position to cause said drag band to release said drag force from said actuator ring in its first actuator position, and wherein said mode shift mechanism is operable in its third mode position to release said drag force while causing movement of said actuator ring from its first actuator position to its second actuator position. 3. The power transfer device of claim 2 wherein said shift system includes an electric motor having a rotary output, and a drive mechanism for converting bi-directional rotary motion of said motor output into bi-directional translational motion of said mode shift mechanism between its three distinct mode positions. 4. The power transfer device of claim 3 further comprising: a control system having a mode selector capable of generating a mode signal indicative of the drive mode selected; and a control unit receiving said mode signal and actuating said motor in response thereto for moving said mode shift mechanism to its mode position corresponding to the selected drive mode. 5. The power transfer device of claim 1 further comprising: a reduction unit having an input member driven by said input and an output member driven at a reduced speed relative to said input member; a range clutch operable in a first mode to couple said first output to said input member of said reduction unit and establish a high-range drive connection therebetween, and said range clutch is operable in a second mode to couple said first output to said output member of said reduction unit and establish a low-range drive connection therebetween; and a range shift mechanism operable in a first range position to shift said range clutch into its first mode and in a second range position to shift said range clutch into its second mode, and wherein said shift system is operable for coordinating movement of said range shift mechanism and said mode shift mechanism. 6. The power transfer device of claim 5 wherein an on-demand high-range four-wheel drive mode is established when said mode shift mechanism is in its first mode position and said range shift mechanism is in its first range position, wherein a locked high-range four-wheel drive mode is established when said mode shift mechanism is in its second mode position and said range shift mechanism in its first range position, wherein a two-wheel high-range drive mode is established when said mode shift mechanism is in its third mode position and said range shift mechanism is in its first range position, and wherein a locked low-range four-wheel drive mode is established when said mode shift mechanism is in its second mode position and said range shift mechanism is in its second range position. 7. The power transfer device of claim 1 defining a transfer case with an input shaft as its input, a first output shaft as its first output, and a second output shaft as its second output, and further including a transfer unit driven by said first output shaft with said mode clutch operably disposed between said transfer unit and said second output shaft. 8. The power transfer device of claim 1 defining a power take-off unit having a transfer shaft as its input, a right-angled drive unit driven by said transfer shaft as its first output, and a second transfer shaft driving a differential associated with the second driveline as its second output, and wherein said mode clutch is operably disposed between said first and second transfer shafts. 9. The power transfer device of claim 1 defining a power take-off unit having differential carrier of a differential unit associated with the first driveline as its first output and a right-angled drive unit as its second output, and wherein said mode clutch is operably disposed between said differential carrier and said drive unit. 10. The power transfer device of claim 1 defining a power take-off unit having a first differential unit as its input, a drive unit as its first output, and a second differential unit as its second output, said first differential unit including an input member driven by the powertrain, a first output gear driving said drive unit, and a second output gear driving said second differential unit, and wherein said mode clutch is operably disposed between said first and second output gears of said first differential unit. 11. A transfer case for use in a four-wheel drive motor vehicle having a powertrain and first and second drivelines, comprising: a first shaft for transmitting drive torque from the powertrain to the first driveline; a second shaft for transmitting drive torque to the second driveline; a transfer unit coupled for rotation with said second output shaft and having a hub surrounding said first shaft; a bi-directional overrunning mode clutch operable for transmitting drive torque from said first shaft to said second shaft, said mode clutch including a first ring fixed for rotation with said first shaft and having first cam tracks, a second ring disposed between said first ring and said hub and having second cam tracks, rollers disposed within aligned pairs of said first and second cam tracks, an actuator ring supported for translational movement between a first actuator position and a second actuator position and having a lug disposed within an actuation slot formed in said second ring, a biasing unit for biasing said actuator ring toward its first actuator position, and a drag band for exerting a drag force on said actuator ring; a mode shift mechanism moveable between first, second and third mode positions, said mode shift mechanism is operable in its first mode position to cause said drag band to exert said drag force on said actuator ring while located in its first actuator position for permitting movement of said lug from a central position into engagement with one of first and second end surfaces of said actuation slot so as to establish an on-demand four-wheel drive mode wherein relative rotation between said first and second shafts is prevented in a first direction and is permitted in a second direction, said mode shift mechanism is operable in its second mode position to cause said drag band to release said drag force from said actuator ring while located in its first actuator position for inhibiting movement of said lug into engagement with either of said first and second end surfaces of said actuation slot so as to establish a locked four-wheel drive mode wherein relative rotation between said first and second shafts is prevented in both directions, and wherein said mode shift mechanism is operable in its third mode position to cause said drag band to release said drag force from said actuator ring and locate said actuator ring in its second actuator position for positioning said lug in engagement with both of said end surfaces of said slot so as to establish a two-wheel drive mode wherein relative rotation between said first and second shafts is permitted in both directions; and a shift system for moving said mode shift mechanism between its three distinct mode positions. 12. The transfer case of claim 11 wherein said shift system comprises: a drive mechanism coupled to said mode shift mechanism; a power-operated actuator for causing said drive mechanism to move said mode shift mechanism; a mode selector for permitting selection of at least said on-demand four-wheel drive mode and said locked four-wheel drive mode and generating a mode signal indicative of the drive mode selected; and a control unit for receiving said mode signal and controlling actuation of said power-operated actuator for moving said mode shift mechanism to its first mode position when said on-demand four-wheel drive mode is selected and moving said mode shift mechanism to its second mode position when said locked four-wheel drive mode is selected. 13. The transfer case of claim 12 wherein said mode selector further permits selection of said two-wheel drive mode which causes said control unit to command said power-operated actuator to move said mode shift mechanism to its third mode position. 14. The transfer case of claim 12 wherein said control unit is further operable to cause said mode select mechanism to be moved from either of its first or second mode positions into its third mode position in response to detection of a braking condition. 15. The transfer case of claim 12 wherein said drive mechanism is a rotary sector plate having a cam surface, wherein said mode shift mechanism includes a mode fork having a follower segment engaging said cam surface and a cam segment adapted to engage said drag band, and wherein said power-operated actuator is an electric motor operable for rotating said sector plate in response to control signals from said control unit. 16. The transfer case of claim 15 wherein said cam surface is contoured to cause movement of said mode fork between its first, second and third mode positions in response to rotation of said sector plate, wherein movement of said mode fork to its first mode position causes a first portion of said cam segment to retract end portions of said drag band so as to permit said drag band to exert said drag force on said actuator ring, wherein movement of said mode fork from its first mode position into its second mode position causes a second portion of said cam segment to expand said end portions of said drag band so as to release said drag force from said actuator ring, and wherein movement of said mode fork from its second mode position into its third mode position causes said second portion of said cam segment to maintain expansion of said end portions of said drag band while said first portion of said cam segment forcibly urges said actuator ring to move from its first actuator position into its second actuator position. 17. The transfer case of claim 11 further comprising: a third shaft driven by the powertrain; and a center differential having an input driven by said third shaft, a first output connected to said first shaft, and a second output connected to said hub of said transfer unit. 18. A transfer case for use in a four-wheel drive motor vehicle having a powertrain and first and second drivelines, comprising: a first shaft for transmitting drive torque from the powertrain to the first driveline; a second shaft for transmitting drive torque to the second driveline; a transfer unit driven by said first shaft and having a hub surrounding said second shaft; a bi-directional overrunning mode clutch operable for transmitting drive torque from said first shaft to said second shaft, said mode clutch including a first ring fixed for rotation with said second shaft and having first cam tracks, a second ring disposed between said first ring and said hub and having second cam tracks, rollers disposed within aligned pairs of said first and second cam tracks, an actuator ring supported for translational movement between a first actuator position and a second actuator position and having a lug disposed within an actuation slot formed in said second ring, a biasing unit for biasing said actuator ring toward its first actuator position, and a drag band for exerting a drag force on said actuator ring; a mode shift mechanism moveable between first, second and third mode positions, said mode shift mechanism is operable in its first mode position to cause said drag band to exert said drag force on said actuator ring while located in its first actuator position for permitting movement of said lug from a central position into engagement with one of first and second end surfaces of said actuation slot so as to establish an on-demand four-wheel drive mode wherein relative rotation between said first and second shafts is prevented in a first direction and permitted in a second direction, said mode shift mechanism is operable in its second mode position to cause said drag band to release said drag force from said actuator ring while located in its first actuator position for inhibiting movement of said lug into engagement with either of said first and second end surfaces of said actuation slot so as to establish a locked four-wheel drive mode wherein relative rotation between said first and second shafts is prevented in both directions, and wherein said mode shift mechanism is operable in its third mode position to cause said drag band to release said drag force from said actuator ring and locate said actuator ring in its second actuator position for positioning said lug in engagement with both of said end surfaces of said slot so as to establish a two-wheel drive mode wherein relative rotation between said first and second shafts is permitted in both directions; and a shift system for moving said mode shift mechanism between its three distinct mode positions. 19. The transfer case of claim 18 wherein said shift system comprises: a drive mechanism coupled to said mode shift mechanism; a power-operated actuator for causing said drive mechanism to move said mode shift mechanism; a mode selector for permitting selection of at least said on-demand four-wheel drive mode and said locked four-wheel drive mode and generating a mode signal indicative of the drive mode selected; and a control unit for receiving said mode signal and controlling actuation of said power-operated actuator for moving said mode shift mechanism to its first mode position when said on-demand four-wheel drive mode is selected and moving said mode shift mechanism to its second mode position when said locked four-wheel drive mode is selected. 20. The transfer case of claim 19 wherein said mode selector further permits selection of said two-wheel drive mode which causes said control unit to command said power-operated actuator to move said mode shift mechanism to its third mode position. 21. The transfer case of claim 19 wherein said control unit is further operable to cause said mode select mechanism to be moved from either of its first or second mode positions into its third mode position in response to detection of a braking condition. 22. The transfer case of claim 19 wherein said drive mechanism is a rotary sector plate having a cam surface, wherein said mode shift mechanism includes a mode fork having a follower segment engaging said cam surface and a cam segment adapted to engage said drag band, and wherein said power-operated actuator is an electric motor operable for rotating said sector plate in response to control signals from said control unit. 23. The transfer case of claim 22 wherein said cam surface is contoured to cause movement of said mode fork between its first, second and third mode positions in response to rotation of said sector plate, wherein movement of said mode fork to its first mode position causes a first portion of said cam segment to retract end portions of said drag band so as to permit said drag band to exert said drag force on said actuator ring, wherein movement of said mode fork from its first mode position into its second mode position causes a second portion of said cam segment to expand said end portions of said drag band so as to release said drag force from said actuator ring, and wherein movement of said mode fork from its second mode position into its third mode position causes said second portion of said cam segment to maintain expansion of said end portions of said drag band while a third portion of said cam segment forcibly urges said actuator ring to move from its first actuator position into its second actuator position. 24. In a four-wheel drive vehicle having a powertrain and first and second sets of wheels, a power transfer unit comprising: a first drive mechanism having a first rotary component for transmitting drive torque from the powertrain to a first driveline for driving the first set of wheels; a second drive mechanism having a second rotary component for transmitting drive torque to the second pair of wheels; a bi-directional overrunning mode clutch operable for transmitting drive torque from said first drive mechanism to said second drive mechanism, said mode clutch includes a first ring fixed for rotation with said first rotary component of said first drive mechanism and having first cam tracks, a second ring disposed between said first ring and said second rotary component of said second drive mechanism and having second cam tracks, rollers disposed within aligned pairs of said first and second cam tracks, an actuator ring supported for translational movement between a first actuator position and a second actuator position and having a lug disposed within an actuation slot formed in said second ring, a biasing unit for biasing said actuator ring toward its first actuator position, and a drag band for exerting a drag force on said actuator ring; a mode shift mechanism moveable between first, second and third mode positions, said mode shift mechanism is operable in its first mode position to cause said drag band to exert said drag force on said actuator ring while located in its first actuator position for permitting movement of said lug from a central position into engagement with one of first and second end surfaces of said actuation slot so as to establish an on-demand four-wheel drive mode wherein relative rotation between said first and second rotary components is prevented in a first direction and is permitted in a second direction, said mode shift mechanism is operable in its second mode position to cause said drag band to release said drag force from said actuator ring while located in its first actuator position for inhibiting movement of said lug into engagement with either of said first and second end surfaces of said actuation slot so as to establish a locked four-wheel drive mode wherein relative rotation between said first and second rotary components is prevented in both directions, and wherein said mode shift mechanism is operable in its third mode position to cause said drag band to release said drag force from said actuator ring and locate said actuator ring in its second actuator position for positioning said lug in engagement with both of said end surfaces of said slot so as to establish a two-wheel drive mode wherein relative rotation between said first and second rotary components is permitted in both directions; and a shift system for moving said mode shift mechanism between its three distinct mode positions. 25. The power transfer unit of claim 24 wherein said shift system comprises: a power-operated actuator for moving said mode shift mechanism; a mode selector for permitting selection of at least said on-demand four-wheel drive mode and said locked four-wheel drive mode and generating a mode signal indicative of the drive mode selected; and a control unit for receiving said mode signal and controlling actuation of said power-operated actuator for moving said mode shift mechanism to its first mode position when said on-demand four-wheel drive mode is selected and moving said mode shift mechanism to its second mode position when said locked four-wheel drive mode is selected. 26. The power transfer unit of claim 25 wherein said mode selector further permits selection of said two-wheel drive mode which causes said control unit to command said power-operated actuator to move said mode shift mechanism to its third mode position. 27. The power transfer unit of claim 25 wherein said control unit is further operable to cause said mode select mechanism to be moved from either of its first or second mode positions into its third mode position in response to detection of a braking condition. 28. The power transfer unit of claim 25 wherein said shift system includes a rotary sector plate having a cam surface, wherein said mode shift mechanism includes a mode fork having a follower segment engaging said cam surface and a cam segment adapted to engage said drag band, and wherein said power-operated actuator is an electric motor operable for rotating said sector plate in response to control signals from said control unit. 29. The power transfer unit of claim 28 wherein said cam surface is contoured to cause movement of said mode fork between its first, second and third mode positions in response to rotation of said sector plate, wherein movement of said mode fork to its first mode position causes a first portion of said cam segment to retract said end portions of said drag band so as to permit said drag band to exert said drag force on said actuator ring, wherein movement of said mode fork from its first mode position into its second mode position causes a second portion of said cam segment to expand said end portions of said drag band so as to release said drag force from said actuator ring, and wherein movement of said mode fork from its second mode position into its third mode position causes said second portion of said cam segment to maintain expansion of said end portions of said drag band while said first portion of said cam segment forcibly urges said actuator ring to move from its first actuator position into its second actuator position. 30. A power transfer take-off unit for use in a motor vehicle having a powertrain and first and second drivelines, comprising: a first shaft driven by the powertrain; a right-angled drive unit connecting said first shaft to the first driveline; a second shaft driving a differential associated with the second driveline; a bi-directional overrunning mode clutch operably disposed between said first and second shafts, said mode clutch is operable in a first mode to permit relative rotation between said first and second shafts in a first direction and prevent relative rotation therebetween in a second direction, said mode clutch is operable in a second mode to prevent relative rotation between said first and second shafts in both directions, and said mode clutch is operable in a third mode to permit relative rotation between said first and second shafts in both directions; a mode shift mechanism operable in a first mode position to shift said mode clutch into its first mode, in a second mode position to shift said mode clutch into its second mode, and in a third mode position to shift said mode clutch into its third mode; and a shift system for moving said mode shift mechanism to its first mode position to establish an on-demand four-wheel drive mode, to its second mode position to establish a locked four-wheel drive mode, and to its third mode position to establish a two-wheel drive mode. 31. A power transfer take-off unit for use in a motor vehicle having a powertrain and first and second drivelines, comprising: a differential associated with the first driveline having a carrier driven by the powertrain; a right-angled drive unit connected to the second driveline; a bi-directional overrunning mode clutch operably disposed between said carrier and said drive unit, said mode clutch is operable in a first mode to permit relative rotation between said carrier and said drive unit in a first direction and prevent relative rotation therebetween in a second direction, said mode clutch is operable in a second mode to prevent relative rotation between said carrier and said drive unit in both directions, and said mode clutch is operable in a third mode to permit relative rotation between said carrier and said drive unit in both directions; a mode shift mechanism operable in a first mode position to shift said mode clutch into its first mode, in a second mode position to shift said mode clutch into its second mode, and in a third mode position to shift said mode clutch into its third mode; and a shift system for moving said mode shift mechanism to its first mode position to establish an on-demand four-wheel drive mode, to its second mode position to establish a locked four-wheel drive mode, and to its third mode position to establish a two-wheel drive mode. 32. A power transfer device for use in a motor vehicle having a powertrain and first and second drivelines, comprising: a first differential having an input member driven by the powertrain and a gearset having a first and second output gears; a drive unit connected to the first driveline and driven by said first output gear; a second differential associated with the second driveline which is driven by said second output gear; a bi-directional overrunning mode clutch operably disposed between said first and second output gears of said first differential, said mode clutch is operable in a first mode to permit relative rotation between said first and second output gears in a first direction and prevent relative rotation therebetween in a second direction, said mode clutch is operable in a second mode to prevent relative rotation between said first and second output gears in both directions, and said mode clutch is operable in a third mode to permit relative rotation between said first and second output gears in both directions; a mode shift mechanism operable in a first mode position to shift said mode clutch into its first mode, in a second mode position to shift said mode clutch into its second mode, and in a third mode position to shift said mode clutch into its third mode; and a shift system for moving said mode shift mechanism to its first mode position to establish an on-demand four-wheel drive mode, to its second mode position to establish a locked four-wheel drive mode, and to its third mode position to establish a two-wheel drive mode.
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이 특허에 인용된 특허 (48)
Showalter Dan J., Acceleration sensitive double overrunning clutch.
Varma Sanjeev K. (Syracuse NY) Williams Randolph C. (Weedsport NY) Sperduti David (Auburn NY) Wilson Robert J. (Warners NY) Reagan Edward J. (Skaneateles NY), Full-time four wheel drive transfer case.
Bakowski Richard A. (Warners NY) Eastman Richard E. (Central Square NY), Full-time transfer case with synchronized range shift mechanism and on-demand differentiation control.
Wilson Robert J. (6711 Pottery Rd. Warners NY 13164) Williams Randolph C. (8836 S. Willow St. Weedsport NY 13166) Zalewski John D. (303 Balsam St. Liverpool NY 13088) Varma Sanjeev K. (2406 Euclid Av, Full-time transfer case with synchronized single planetary gear reduction unit.
Watson Will (Southfield MI) Miller Alan L. (Ithaca NY) Sundquist Drew A. (Canton MI) Simpson Roger T. (Ithaca NY) Ducklow Diane K. (Farmington MI) Beckerman Joseph W. (Livonia MI) Showalter Dan J. (P, On demand vehicle drive system.
Wilson Robert J. (Warners NY) Sperduti David (Auburn NY) Eastman Richard E. (Central Square NY) Adler Randy W. (Seneca Falls NY) Winks Joseph A. (West Monroe NY), Power transfer system for a four-wheel drive vehicle.
Wilson Robert J. (Warners NY) Sperduti David (Auburn NY) Eastman Richard E. (Central Square NY) Divecha Neville K. (Camillus NY) Winks Joseph A. (West Monroe NY), Rotary actuation mechanism for torque modulated transfer case.
Williams Randolph C. (Weedsport NY) Eastman Richard E. (Central Square NY) Varma S. K. (Syracuse NY), Transfer case limited slip planetary differential.
Zalewski John D. ; Mohan Sankar K. ; Schleuder Carl D. ; Fanning Ellen M. ; Burns Timothy M. ; Conklin Douglas, Two-speed transfer case with on-demand torque control having a coupling pump and a supply pump.
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