Two-speed transfer case with ballramp clutch actuator
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16H-037/08
F16H-037/06
B60K-017/35
출원번호
UP-0509751
(2006-08-24)
등록번호
US-7540820
(2009-07-01)
발명자
/ 주소
Mizon, Richard
Brissenden, James S.
출원인 / 주소
Magna Powertrain USA, Inc.
대리인 / 주소
Harness, Dickey & Pierce, P.L.C.
인용정보
피인용 횟수 :
2인용 특허 :
32
초록▼
A transfer case is provided with a range unit, an interaxle differential, a clutch assembly and a power-operated actuation mechanism. The range unit includes a planetary gearset driven by an input shaft, and a synchronized dog clutch assembly for releasably coupling one of the input shaft or an out
A transfer case is provided with a range unit, an interaxle differential, a clutch assembly and a power-operated actuation mechanism. The range unit includes a planetary gearset driven by an input shaft, and a synchronized dog clutch assembly for releasably coupling one of the input shaft or an output component of the planetary gearset to an input member of the interaxle differential. The interaxle differential further includes a first output member driving a first output shaft, a second output member operably driving a second output shaft. The clutch assembly is a multi-plate friction clutch operably disposed between the first and second output shafts. The power-operated actuation mechanism includes a range actuator assembly, a clutch actuator assembly and a motor assembly operable to control coordinated actuation of the range actuator assembly and the clutch actuator assembly.
대표청구항▼
What is claimed is: 1. A transfer case comprising: an input shaft; first and second output shafts; an interaxle differential having an input member, a first output member coupled to said first output shaft, a second output member coupled to said second output shaft, and a gearset interconnecting sa
What is claimed is: 1. A transfer case comprising: an input shaft; first and second output shafts; an interaxle differential having an input member, a first output member coupled to said first output shaft, a second output member coupled to said second output shaft, and a gearset interconnecting said input member to said first and second output members; 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 moveable between a first range position and a second range position, said dog clutch is operable in its first range position to releasably couple said input shaft to said input member of said differential for establishing a high-range drive connection therebetween, and said dog clutch is operable in its second range position to releasably couple said output component of said range unit to said input member of said differential for establishing a low-range drive connection therebetween, a friction clutch operably disposed between said any two members of said interaxle differential; a ballramp unit having a first plate, a second plate and rollers engaging a cam surface formed between said first and second plates, said first plate is adapted to move axially relative to said friction clutch in response to rotary movement of said second plate between a first mode position whereat a minimum clutch engagement force is exerted on said friction clutch and a second mode position for whereat a maximum clutch engagement force is exerted on said friction clutch; and a power-operated actuation mechanism for controlling coordinated movement of said dog clutch between its first and second range positions and said second plate between its first and second mode positions, said actuation mechanism including a motor, a driveshaft rotatively driven by said motor, a mode cam assembly operably connecting said second plate to said driveshaft, a range cam driven by said driveshaft and a shift fork having a first segment engaging said range cam and a second segment coupled to said dog clutch, said mode cam assembly including a mode cam driven by said driveshaft and a sector plate coupled to said second plate, said mode cam having first and second followers and said sector plate having a first cam surface engageable with said first follower and a second cam surface engageable with said second follower. 2. The transfer case of claim 1 wherein rotation of said driveshaft in a first direction causes concurrent rotation of said range cam which cause movement of said dog clutch toward its first range position while rotation of said driveshaft in a second direction causes said range cam to move said dog clutch toward its second range position. 3. The transfer case of claim 2 wherein said dog clutch moves between its first and second range positions while said second plate is located in its first mode position such that said friction clutch is released during movement of said dog clutch. 4. The transfer case of claim 3 wherein continued rotation of said driveshaft in said first direction when said dog clutch is located in its first range position causes said first follower on said mode cam to engage said first cam surface on said sector plate for causing rotation of said second plate from its first mode position whereat said friction clutch is released toward its second mode position whereat said friction clutch is fully engaged. 5. The transfer case of claim 4 further comprising a control system for controlling the axial position of said first plate in response to angular movement of said second plate between its first and second mode positions to modulate the engagement of said friction clutch. 6. The transfer case of claim 3 wherein continued rotation of said driveshaft in said second direction when said dog clutch is located in its second range position causes said second follower on said mode cam to engage said second cam surface on said sector plate for causing rotation of said second plate from its first mode position toward its second mode position. 7. 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 an apply 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; an actuation mechanism for coordinating movement of said dog clutch and said apply plate, said actuation mechanism including a motor driving a driveshaft, a range actuator assembly driven by said driveshaft for moving said dog clutch between its first and second range positions, and a mode actuator assembly driven by said driveshaft for moving said apply plate between its first and second mode positions, said driveshaft being rotatable through a first range of travel for causing said range actuator assembly to move said dog clutch between its first and second range positions while said mode actuator assembly maintains said apply plate in its first mode position, a second range of travel for causing said range actuator assembly to maintain said dog clutch in its first range position while said mode actuator assembly moves said apply plate between its first and second mode positions, and a third range of travel for causing said range actuator assembly to maintain said dog clutch in its second range position while said mode actuator assembly moves said apply plate between its first and second mode positions; and a control system for controlling actuation of said motor; wherein said mode actuator assembly includes a mode cam driven by said driveshaft and having first and second followers, and a clutch operator for converting rotary movement of said mode cam into axial movement of said apply plate, said clutch operator including a first cam member having a first cam surface engageable with said first follower and a second cam surface engageable with said second follower, a second cam member disposed between said first cam member and said apply plate, and rollers disposed between said first and second cam members. 8. The transfer case of claim 7 wherein said first range of rotary travel of said driveshaft equals about 180° and said second and third ranges of rotary travel of said driveshaft each equal about 90°. 9. The transfer case of claim 7 wherein said range actuator assembly comprises: a range cam coupled for rotation with said driveshaft; a shift fork coupled to said dog 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 dog clutch between its first and second range positions. 10. The transfer case of claim 9 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 high-range dwell segment, a low-range dwell segment, and a shift segment interconnecting said high-range and low-range dwell segments, said shift segment is configured to cause axial movement of said dog clutch between its first and second range positions during rotation of said driveshaft through its first range of rotary travel, said high-range dwell segment is configured to maintain said dog clutch in its first range position during rotation of said driveshaft caused through its second range of rotary travel, and said low-range dwell segment is configured to maintain said dog clutch in its second range position during rotation of said driveshaft through its third range of rotary travel. 11. The transfer case of claim 7 wherein said mode cam surrounds and is couple to said driveshaft, wherein said first cam member surrounds said first output shaft and includes a sector portion which defines said first and second cam surfaces, wherein said second cam member surrounds said first output shaft adjacent to said first cam member, and wherein said rollers engage a ramp surface formed between said first and second cam members. 12. The transfer case of claim 7 wherein said first and second followers are displaced from engagement with said first and second cam surfaces during rotation of said driveshaft through its first range of travel, wherein said first follower engages said first cam surface and causes said first cam member to rotate relative to said second member such that said second cam member moves axially to move said apply plate between its first and second mode positions in response to rotation of said driveshaft through its second range of travel, and wherein said second follower engages said second cam surface and causes said first cam member to rotate relative to said second cam member such that said second cam member moves said apply plate between its first and second positions in response to rotation of said driveshaft through its third range of angular travel. 13. 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 moveable between a first range position and a second range position, said dog clutch is operable in its first range position to releasably couple said first output shaft for establishing a high-range drive connection therebetween, and said dog clutch is operable in its second range position to releasably couple said output component of said range unit to said first output shaft for establishing a low-range drive connection therebetween, a friction clutch operably disposed between said first and second output shafts; a ballramp unit having a first plate, a second plate and rollers engaging a cam surface formed between said first and second plates, said first plate is adapted to move axially relative to said friction clutch in response to rotary movement of said second plate between a first mode position whereat a minimum clutch engagement force is exerted on said friction clutch and a second mode position for whereat a maximum clutch engagement force is exerted on said friction clutch; and a power-operated actuation mechanism for controlling coordinated movement of said dog clutch between its first and second range positions and said second plate between its first and second mode positions, said actuation mechanism including a motor, a driveshaft rotatively driven by said motor, a mode cam assembly connecting said second plate to said driveshaft, a range cam driven by said driveshaft and a shift fork having a first segment engaging said range cam and a second segment coupled to said dog clutch, said mode cam assembly including a mode cam driven by said driveshaft and a sector plate coupled to said second plate, said mode cam having first and second follower and said sector plate having a first cam surface engageable with said first followers and a second cam surface engageable with said second follower. 14. The transfer case of claim 13 wherein said first segment of said shift fork is retained in a groove formed in said range cam, wherein said groove in said range cam includes a first circumferential groove, a second circumferential groove and a spiral groove connecting said first and second circumferential grooves, whereby rotation of said driveshaft in a first direction causes concurrent rotation of said range cam which cause movement of said dog clutch toward its first range position while rotation of said driveshaft in a second direction causes said range cam to move said dog clutch toward its second range position. 15. The transfer case of claim 14 wherein said dog clutch moves between its first and second range positions while said second plate is in its first mode position such that said friction clutch is released during movement of said dog clutch. 16. The transfer case of claim 15 wherein continued rotation of said driveshaft in a first direction when said dog clutch is in its first range position causes said first segment of said shift fork to enter said first circumferential groove and said first follower on said mode cam to engage said first cam surface and cause rotation of said sector plate such that said second plate moves from its first mode position whereat said friction clutch is released toward its second mode position whereat said friction clutch is fully engaged. 17. The transfer case of claim 16 further comprising a control system for controlling the position of said second plate between its first and second mode positions to modulate the engagement of said friction clutch. 18. A transfer case, comprising: an input shaft; first and second output shafts; a range unit driven by said input shaft; a range clutch for releaseably coupling said first output shaft to one of said input shaft and said range unit; a mode clutch for providing variable engagement between said first and second output shafts; an actuation mechanism for coordinating actuation of said range clutch and said mode clutch, said actuation mechanism including a driveshaft, a power-operated device for bi-directionally rotating said driveshaft, a range actuator assembly for converting rotation of said driveshaft into translation of said range clutch, and a mode actuator assembly for converting rotation of said driveshaft into a clutch engagement force exerted on said mode clutch, said mode actuator assembly including a cam mechanism having a first cam member operable to exert said clutch engagement force on said mode clutch in response to rotation of a second cam member, a sector member coupled to said second cam member and having a first and second cam surfaces, and a mode cam driven by said driveshaft and having a first follower engageable with said first cam surface and a second follower engageable with said second cam surface. 19. The transfer case of claim 18 wherein said range clutch is axially moveable between first and second range positions, said range clutch is operable in its first range position to releaseably couple said first output shaft to said input shaft for establishing a high-range drive connection therebetween, and said range clutch is operable in its second range position to releaseably couple said first output shaft to said range unit for establishing a low-range drive connection between said input shaft and said first output shaft, and wherein said range actuator assembly includes a range cam fixed for rotation with said driveshaft and a shift fork configured to convert rotation of said range cam into axial translation of said range clutch. 20. The transfer case of claim 19 wherein said mode clutch is a multi-plate friction clutch operably disposed between said first and second output shafts, and wherein said first and second cam members of said cam mechanism define first and second cam plates aligned to surround said first output shaft, said first cam plate is axially moveable relative to said friction clutch in response to rotary movement of said second cam plate between a first mode position whereat a minimum clutch engagement force is exerted on said friction clutch and a second mode position whereat a maximum clutch engagement force is exerted on said friction clutch. 21. The transfer case of claim 20 wherein rotation of said driveshaft in a first direction causes concurrent rotation of said range cam which cause movement of said range clutch toward its first range position while rotation of said driveshaft in a second direction causes said range cam to move said range clutch toward its second range position, and wherein said range clutch moves between its first and second range positions while said second cam plate is located in its first mode position such that said friction clutch is released during movement of said range clutch. 22. The transfer case of claim 20 wherein said cam mechanism further includes a ramp surface formed on at least one of said first and second cam plates, and rollers engaging said ramp surface. 23. The transfer case of claim 21 wherein continued rotation of said driveshaft in said second direction when said range clutch is located in its second range position causes said second follower on said mode cam to engage said second cam surface on said sector member for causing rotation of said second cam plate from its first mode position toward its second mode position. 24. The transfer case of claim 22 wherein continued rotation of said driveshaft in said first direction when said range clutch is located in its first range position causes said first follower on said mode cam to engage said first cam surface on said sector member for causing said second cam plate from its first mode position toward its second mode position. 25. The transfer case of claim 18 wherein said first and second followers are displaced from engagement with said first and second cam surfaces during rotation of said driveshaft through a first range of travel, wherein said first follower engages said first cam surface and causes said second cam member to rotate relative to said first cam member such that said first cam member moves axially relative to said friction clutch in response to rotation of said driveshaft through a second range of travel, and wherein said second follower engages said second cam surface and causes said second cam member to rotate relative to said first cam member such that said first cam member moves axially relative to said friction clutch in response to rotation of said driveshaft through a third range of angular travel. 26. The transfer case of claim 18 further including a differential assembly having an input member, a first output member coupled to said first output shaft, a second output member coupled to said second output shaft, and a gearset interconnecting said input member to said first and second output members, and wherein said range clutch is operable for releaseably coupling said input member of said differential assembly to one of said input shaft and said range unit.
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이 특허에 인용된 특허 (32)
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.
Schlatzer, Helmut; Stocker, Martin; Tangl, Ferdinand, Device for actuating a clutch-controlled transfer case having a two-stage intermediate gearing and clutch-controlled transfer case that has a two-stage intermediate gearing and that is equipped with said device.
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