Clutch actuation system for two-speed active transfer case
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16H-037/08
F16H-037/06
출원번호
US-0124868
(2005-05-09)
발명자
/ 주소
Mueller,Joseph G.
Ronk,Aaron
출원인 / 주소
Magna Powertrain, Inc.
대리인 / 주소
Harness, Dickey &
인용정보
피인용 횟수 :
6인용 특허 :
28
초록▼
A transfer case includes a two-speed range unit, a friction clutch, an actuation mechanism, and a control system. The actuation mechanism includes an electric motor, a geartrain driven by the motor, a range actuator assembly and a mode actuator assembly. The range actuator assembly includes a drives
A transfer case includes a two-speed range unit, a friction clutch, an actuation mechanism, and a control system. The actuation mechanism includes an electric motor, a geartrain driven by the motor, a range actuator assembly and a mode actuator assembly. The range actuator assembly includes a driveshaft driven by the geartrain, a cam driven by the driveshaft, and a shift fork having a follower retained in a groove formed in the cam and a fork engaging a shift collar associated with the range unit. The mode actuator assembly has a cam member with ramp surfaces and a control gear with rollers engaging the ramp surfaces. The control gear is rotatively driven by the geartrain. The cam member is axially moveable for controlling engagement of the friction clutch. An anti-rotation mechanism limits rotation of the cam member in response to continued rotation of the control gear.
대표청구항▼
What is claimed is: 1. A transfer case comprising: an input shaft; first and second output shafts; a range unit driven at a reduced speed relative to said input shaft; a range clutch operable in a first range position to establish a drive connection between said input shaft and said first output sh
What is claimed is: 1. A transfer case comprising: an input shaft; first and second output shafts; a range unit driven at a reduced speed relative to said input shaft; a range clutch operable in a first range position to establish a drive connection between said input shaft and said first output shaft and further operable in a second range position to establish a drive connection between said range unit and said first output shaft; a mode clutch operable in a first mode position to disengage said second output shaft from driven engagement with said first output shaft and further operable in a second mode position to establish a drive connection between said first output shaft and said second output shaft; a geartrain having an input gear driving an output gear; a motor driving said input gear; a range actuator driven by said output gear for moving said range clutch between its first and second range positions; a mode actuator driven by said output gear for moving said mode clutch between its first and second mode positions; and a control system for actuating said motor to control the magnitude and direction of rotation of said output gear through three distinct ranges of travel so as to coordinate movement of said range clutch and said mode clutch. 2. The transfer case of claim 1 wherein rotation of said output gear through a first range of travel causes said range actuator to move said range clutch between its first and second range positions while said mode actuator maintains said mode clutch in its first mode position, and wherein rotation of said output gear through a second range of travel causes said range actuator to maintain said range clutch in its first range position while said mode actuator moves said mode clutch between its first and second mode positions. 3. The transfer case of claim 2 wherein rotation of said output gear through a third range of travel causes said range actuator to maintain said range clutch in its second range position while said mode actuator moves said mode clutch between its first and second mode positions. 4. The transfer case of claim 2 wherein said first range of rotary travel of said output gear equals about 180째 and said second range of rotary travel of said output gear equals about 90째. 5. The transfer case of claim 1 wherein said geartrain includes a first gearset having said input gear driven by said motor and a first transfer gear driven by said input gear for rotation about a first axis, and a second gearset having a second transfer gear driven by said first transfer gear and which drives said output gear for rotation about a second axis. 6. The transfer case of claim 1 wherein said range actuator comprises: a driveshaft coupled for rotation with said output gear; a range cam coupled for rotation with said driveshaft; a shift fork coupled to said range clutch; and a mechanism interconnecting said shift fork to said range cam which is operable to convert rotary movement of said range cam into axial movement of said shift fork for moving said range clutch between its first and second range positions. 7. The transfer case of claim 6 wherein said mechanism includes a follower secured to said shift fork which extends into a groove formed in said range cam, said groove including a first dwell segment, a second dwell segment, and a shift segment interconnecting said first and second dwell segments, said shift segment is configured to cause axial movement of said range clutch between its first and second range positions during rotation of said driveshaft caused by rotation of said output gear through a first range of rotary travel, said first dwell segment is configured to maintain said range clutch in its first range position during rotation of said driveshaft caused by rotation of said output gear through a second range of rotary travel, and said second dwell segment is configured to maintain said range clutch in its second range position during rotation of said driveshaft caused by rotation of said output gear through a third range of rotary travel. 8. The transfer case of claim 1 wherein said mode actuator comprises: a control gear rotatably driven by said output gear; a cam member having a first cam surface, a second cam surface, and an anti-rotation lug; and a roller disposed between said control gear and said cam member that is adapted to engage said first and second cam surfaces, wherein said mode clutch is moveable between its first and second mode positions in response to movement of said cam member between a retracted position and an extended position relative to said control gear. 9. The transfer case of claim 8 wherein rotation of said output gear within a first range of rotary travel causes corresponding rotation of said control gear through a first range of rotary travel, and wherein rotation of said control gear through its first range of rotary travel causes concurrent rotary movement of said cam member while said cam member is maintained in its retracted position. 10. The transfer case of claim 9 wherein rotation of said output gear within a second range of rotary travel causes corresponding rotation of said control gear through a second range of rotary travel, and wherein rotation of said control gear through its second range of rotary travel causes said anti-rotation lug on said cam member to engage a first anti-rotation stop such that said control gear rotates relative to said cam member, whereby such relative rotation causes said roller to ride on said first cam surface and forcibly move said cam member between its retracted and extended positions. 11. The transfer case of claim 10 wherein rotation of said output gear within a third range of rotary travel causes corresponding rotation of said control gear through a third range of rotary travel, and wherein rotation of said control gear through its third range of rotary travel causes said anti-rotation lug on said cam member to engage a second anti-rotation stop such that said control gear rotates relative to said cam member, whereby such relative rotation causes said roller to ride on said second cam surface and axially move said cam member between its retracted and extended positions. 12. A transfer case comprising: an input shaft; first and second output shafts; a range unit driven at a reduced speed relative to said input shaft; a differential having an input component, a first output component driving said first output shaft and a second output component driving said second output shaft; a range clutch operable in a first range position to establish a drive connection between said input shaft and said input component and further operable in a second range position to establish a drive connection between said range unit and said input component; a mode clutch operable in a first mode position to permit speed differentiation between said first and second output shafts and further operable in a second mode position to inhibit speed differentiation between said first and second output shafts; a geartrain having an input gear driving an output gear; a motor driving said input gear; a range actuator driven by said output gear for moving said range clutch between its first and second range positions; a mode actuator driven by said output gear for moving said mode clutch between its first and second mode positions; and a control system for actuating said motor to control the magnitude and direction of rotation of said output gear through three distinct ranges of travel so as to coordinate movement of said range clutch and said mode clutch. 13. The transfer case of claim 12 wherein rotation of said output gear through a first range of travel causes said range actuator to move said range clutch between its first and second range positions while said mode actuator maintains said mode clutch in its first mode position, and wherein rotation of said output gear through a second range of travel causes said range actuator to maintain said range clutch in its first range position while said mode actuator moves said mode clutch between its first and second mode positions wherein rotation of said output gear through a third range of travel causes said range actuator to maintain said range clutch in its second range position while said mode actuator moves said mode clutch between its first and second mode positions. 14. The transfer case of claim 13 wherein said first range of rotary travel of said output gear equals about 180째 and said second range of rotary travel of said output gear equals about 90 째. 15. The transfer case of claim 12 wherein said geartrain includes a first gearset having said input gear driven by said motor and a first transfer gear driven by said input gear for rotation about a first axis, and a second gearset having a second transfer gear driven by said first transfer gear and which drives said output gear for rotation about a second axis. 16. The transfer case of claim 12 wherein said range actuator comprises: a driveshaft coupled for rotation with said output gear; a range cam coupled for rotation with said driveshaft; a shift fork coupled to said range clutch; and a mechanism interconnecting said shift fork to said range cam which is operable to convert rotary movement of said range cam into axial movement of said shift fork for moving said range clutch between its first and second range positions. 17. The transfer case of claim 16 wherein said mechanism includes a follower secured to said shift fork which extends into a groove formed in said range cam, said groove including a first dwell segment, a second dwell segment, and a shift segment interconnecting said first and second dwell segments, said shift segment is configured to cause axial movement of said range clutch between its first and second range positions during rotation of said driveshaft caused by rotation of said output gear through a first range of rotary travel, said first dwell segment is configured to maintain said range clutch in its first range position during rotation of said driveshaft caused by rotation of said output gear through a second range of rotary travel, and said second dwell segment is configured to maintain said range clutch in its second range position during rotation of said driveshaft caused by rotation of said output gear through a third range of rotary travel. 18. The transfer case of claim 12 wherein said mode actuator comprises: a control gear rotatably driven by said output gear; a cam member having a first cam surface, a second cam surface, and an anti-rotation lug; and a roller disposed between said control gear and said cam member that is adapted to engage said first and second cam surfaces, wherein said mode clutch is moveable between its first and second mode positions in response to movement of said cam member between a retracted position and an extended position relative to said control gear. 19. The transfer case of claim 18 wherein rotation of said output gear within a first range of rotary travel causes corresponding rotation of said control gear through a first range of rotary travel, and wherein rotation of said control gear through its first range of rotary travel causes concurrent rotary movement of said cam member while said cam member is maintained in its retracted position wherein rotation of said output gear within a second range of rotary travel causes corresponding rotation of said control gear through a second range of rotary travel, and wherein rotation of said control gear through its second range of rotary travel causes said anti-rotation lug on said cam member to engage a first anti-rotation stop such that said control gear rotates relative to said cam member, whereby such relative rotation causes said roller to ride on said first cam surface and forcibly move said cam member between its retracted and extended positions, wherein rotation of said output gear within a third range of rotary travel causes corresponding rotation of said control gear through a third range of rotary travel, and wherein rotation of said control gear through its third range of rotary travel causes said anti-rotation lug on said cam member to engage a second anti-rotation stop such that said control gear rotates relative to said cam member, whereby such relative rotation causes said roller to ride on said second cam surface and axially move said cam member between its retracted and extended positions. 20. A transfer case comprising: an input shaft; first and second output shafts; a range unit driven by said input shaft and having an output component driven at a reduced speed relative to said input shaft; a dog clutch operable in a first range position to couple said input shaft to said first output shaft for establishing a high-range drive connection, said dog clutch is further operable in a second range position to couple said output component of said range unit to said first output shaft for establishing a low-range drive connection; a mode clutch including a clutch pack operably disposed between said first and second output shafts and a pressure plate moveable between a first mode position whereat a minimum clutch engagement force is exerted on said clutch pack and a second mode position whereat a maximum clutch engagement force is exerted on said clutch pack; and an actuation mechanism including a geartrain having an input gear and an output gear, a motor driving said input gear, a range actuator driven by said output gear for moving said dog clutch between its first and second range positions, and a mode actuator driven by said output gear for moving said pressure plate between its first and second mode positions, said output gear being rotatable through three distinct ranges of rotary travel for causing said range and mode actuators to coordinate movement of said dog clutch and said pressure plate, wherein said output pear is rotatable through a first range of travel for causing said range actuator to move said dog clutch between its first and second range positions while said mode actuator maintains said pressure plate in its first mode positions, wherein said output gear is rotatable through a second range of travel for causing said range actuator to maintain said dog clutch in its first range position while said mode actuator moves said pressure plate between its first and second mode positions, and wherein said output gear is rotatable through a third range of travel for causing said range actuator to maintain said dog clutch in its second range position while said mode actuator moves said pressure plate between its first and second mode positions. 21. The transfer case of claim 20 wherein said first range of rotary travel of said output gear equals about 180째 and said second and third ranges of rotary travel of said output gear each equal about 90째. 22. The transfer case of claim 20 wherein said mode actuator assembly comprises: a control gear driven by said output gear; a cam member having a first cam surface, a second cam surface, and an anti-rotation lug; a roller mounted to said control gear and adapted to engage either of said first and second cam surfaces; and a thrust member for causing axial movement of said pressure plate between its first and second mode positions in response to axial movement of said cam member between a retracted position and an extended position relative to said control gear. 23. The transfer case of claim 22 wherein rotation of said output gear within its first range of rotary travel causes corresponding rotation of said control gear through a first range of rotary travel, and wherein rotation of said control gear through its first range of rotary travel causes concurrent rotary movement of said cam member while said cam member is maintained in its retracted position. 24. The transfer case of claim 23 wherein rotation of said output gear within its second range of rotary travel causes corresponding rotation of said control gear through a second range of rotary travel, and wherein rotation of said control gear through its second range of rotary travel causes said anti-rotation lug on said cam member to engage a first anti-rotation stop such that said control gear rotates relative to said cam member, whereby such relative rotation causes said roller to ride on said first cam surface and forcibly move said cam member between its retracted and extended positions so as to cause corresponding movement of said pressure plate. 25. The transfer case of claim 24 wherein rotation of said output gear within its third range of rotary travel causes corresponding rotation of said control gear through a third range of rotary travel, and wherein rotation of said control gear through its third range of rotary travel causes said anti-rotation lug on said cam member to engage a second anti-rotation stop such that said control gear rotates relative to said cam member, whereby such relative rotation causes said roller to ride on said second cam surface and axially move said cam member between its retracted and extended positions so as to cause corresponding movement of said pressure plate.
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이 특허에 인용된 특허 (28)
Sakakibara Shiro (Toyokawa JPX) Fukaya Takaharu (Kariya JPX), Actuator for the frictional engaging device.
Showalter Dan J. ; Vogt Carl Randall ; Sewell John S. ; Kowaleski Paul G. ; Barr Rodney E. ; Miller Michael Wayne ; Knox Thomas P. ; Rader Richard K. ; Wood Scott, Electric shift control assembly.
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.
Showalter Dan J. (Plymouth MI) Lindsey Mark A. (Southfield MI) Hamilton Ray F. (Farmington Hills MI) Schoenbach Ronald A. (Farmington Hills MI), Transfer case for four wheel drive vehicles.
Eastman Richard E. (Central Square NY) Wilson Robert J. (Warners NY) Sperduti David (Auburn NY) Adler Randy W. (Seneca Falls NY), Two-speed transfer case with electronic torque modulation.
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