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US08070636B2 Electroyhydraulic control device of a gear unit 有权
减速器电液控制装置

Electroyhydraulic control device of a gear unit
摘要:
An electrohydraulic control device (1) of an 8-speed transmission having several electrically controllable pressure control valves (6-12) for hydraulically actuating five switching elements (A-E) and an electric gear control unit via which different operating states of the transmission may be adjusted. Three of the switching elements are connected in the force flow of the transmission for representing a gear ratio (“1” to “R”) of the transmission. When the gear control unit is de-activated and the power supply to the solenoid valve and pressure control valves is interrupted, and when the transmission is in the operating state, in which a gear ratio (“1”; “2”; “3”; “4”; “5”; “6”; “7”; “8”; “R”) is engaged, a predefined emergency transmission (“6”; “R”) is represented by three simultaneously hydraulically connected switching elements (C, D, E, A, B, D).
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