- Patent Title: Split power infinitely variable transmission architecture incorporating a planetary type ball variator with multiple fixed ranges and low variator load at vehicle launch
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Application No.: US14517364Application Date: 2014-10-17
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Publication No.: US09644721B2Publication Date: 2017-05-09
- Inventor: Brian Schoolcraft
- Applicant: Allison Transmission, Inc.
- Applicant Address: US IN Indianapolis
- Assignee: Allison Transmission, Inc.
- Current Assignee: Allison Transmission, Inc.
- Current Assignee Address: US IN Indianapolis
- Agency: Barnes & Thornburg LLP
- Main IPC: F16H37/08
- IPC: F16H37/08 ; F16H37/02 ; F16H61/686 ; F16H3/66 ; F16H15/28

Abstract:
A transmission includes an input shaft, an output shaft, a variable-ratio unit, and a plurality of torque transmitting mechanisms. The plurality of torque transmitting mechanisms include a first clutch, a second clutch, a third clutch, and a fourth clutch. The transmission is operable to (i) engage the first clutch and the second clutch in a first operating mode and (ii) engage the first clutch and the third clutch in a second operating mode. The transmission is further operable to (i) engage the fourth clutch and disengage the second clutch during a first period of time and (ii) engage the third clutch and disengage the fourth clutch during a second period of time following the first period of time to transition from the first operating mode to the second operating mode.
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