A nested clutch and shift control method thereof

By separately controlling the pressure of the two piston chambers of the nested clutch in the hydraulic automatic transmission, a shift control method is adopted to ensure the stability of power output during gear switching, which solves the problem of power interruption during gear shifting.

CN119755214APending Publication Date: 2025-04-04SHAANXI FAST GEAR CO LTD
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Patent Information

Application Number
CN202411878448.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

There is a problem of power interruption during gear shifting of hydraulic automatic transmissions, which is mainly due to instability in piston chamber pressure control caused by nested clutch structure.

Method used

By separately controlling the pressure of the two piston chambers of the nested clutch in the hydraulic automatic transmission, a shift control method is adopted to allow the oil pressure in the two piston chambers to be no longer just a single oil filling and oil drainage during gear switching, ensuring that the C2 piston and the friction plate are gradually separated to achieve the purpose of disconnecting power transmission. At the same time, the B1 clutch located outside the nested clutch is simultaneously charged.

Benefits of technology

The stability of power output during gear shifting is achieved, the feeling of pause is reduced, the discomfort of drivers and passengers is reduced, and the power interruption problem of hydraulic automatic transmissions in the prior art is solved.

✦ Generated by Eureka AI based on patent content.
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Abstract

The invention discloses a nested clutch and a shift control method thereof, comprising a connected clutch outer hub and a clutch piston seat, wherein a first cavity is formed between the clutch outer hub and the clutch piston seat, a C2 clutch is arranged in the first cavity, and the pressure of two piston cavities of the nested clutch is controlled separately, so that the oil pressure in the two piston cavities is no longer just a single oil filling and oil draining during the gear shifting process. When the C2 piston cavity of the C2 piston needs to drain oil, the pressure is first reduced to a value consistent with the pressure in the C1 piston cavity of the C1 piston, and at the same time, the pressure in the C1 piston cavity is appropriately increased, so that the C2 piston is gradually separated from the friction plate to achieve the purpose of disconnecting power transmission, and the clutch outside the nested clutch is synchronously filled with oil. When the vehicle switches gears during normal driving, the power can be stably output, thereby solving the technical problem of power interruption in the gear shifting process of the hydraulic automatic transmission in the prior art.
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