Eleven-speed automatic transmission
By combining four planetary gear sets and seven torque transmission components, the problem of complex shift control in an eleven-speed transmission was solved, enabling the design of an automatic transmission with more gears, simplifying the control logic and reducing the complexity of the transmission.
CN117307697BActive Publication Date: 2026-06-12CHINA UNIV OF GEOSCIENCES (WUHAN)
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA UNIV OF GEOSCIENCES (WUHAN)
- Filing Date
- 2023-10-31
- Publication Date
- 2026-06-12
AI Technical Summary
Technical Problem
The existing eleven-speed transmission has complex shift control, making it difficult to meet the requirements of automatic transmissions with a high number of gears.
Method used
It adopts a combination of four planetary gear sets, five clutches, and two brakes, and establishes eleven forward gear ratios and one reverse gear ratio through selective engagement, simplifying the control logic.
Benefits of technology
It enables a transmission design with more gears, is easy to control, and only requires replacing a pair of torque transmission components when shifting between adjacent gears, reducing the difficulty of transmission control and size.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN117307697B_ABST
Abstract
The application provides an eleven-gear automatic transmission, which comprises four planetary gear set structures arranged in sequence along the direction from an input member to an output member, a clutch in a torque transmission device connecting the input member and a planetary gear train, a brake in the torque transmission device connecting a transmission housing and the planetary gear train, two of each clutch and each brake being combined to be selectively engaged, eleven forward gear ratios and one reverse gear ratio being established between the input member and the output member. The application has the advantages that more gears are realized by using less planetary gear sets and combining elements, the overspeed gear step ratio is small, the gear shifting is more stable during high-speed driving, the control of each gear only needs to combine two torque transmission members, and only one pair of torque transmission members needs to be combined and disconnected when changing between adjacent gears, the control is simple, the control difficulty and the corresponding volume of the transmission are reduced, the transmission is simple and compact, the volume is small, and the manufacturing process is mature.
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