Hydraulic circuit for the control of a drive train

Details Hydraulic circuit for the control of a drive train Hydraulic circuit for the control of a drive train

2007-11-27

2007-11-27

Ho, Ha D. (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

C475S120000, C475S121000

Reexamination Certificate

active

11259624

ABSTRACT:
A hydraulic circuit for the control of a double clutch transmission which has two transmission groups, each with an isolating clutch and with a plurality of shift clutches for the engagement and disengagement of gear steps, the hydraulic circuit having for each transmission group a specific hydraulic branch connected to a pump in each case via a safety valve, and each hydraulic branch having in each case a clutch control valve for controlling the assigned isolating clutch and at least one shift control valve for controlling the assigned shift clutches. Here, the safety valves are designed in each case as proportional pressure regulating valves.

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International Preliminary Report on Patenability dated Mar. 2, 2006.

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