TRANSMISSION HYDRAULIC SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a transmission hydraulic system having a simple structure and capable of obtaining high efficiency.

SOLUTION: The transmission hydraulic system (1) includes several hydraulic fluid pressure circuits (PK, SK) which can be loaded with or actuated by hydraulic fluid from a fluid pressure source (2). The hydraulic fluid pressure circuits (PK, SK) are differently prioritized in relation to the supply of different areas of the transmission. The pressure in the hydraulic fluid pressure circuits is adjustable according to a system pressure valve (4) and one hydraulic fluid pressure circuits (SK) comprises a cooling device (8) for the hydraulic fluid and a lubrication circuit (9) of the transmission located downstream of the cooling device. Between the cooling device and the lubrication circuit is provided a bypass pipe (L5) shuttable via a valve unit (VE) which can be controlled via the valve unit so that the hydraulic fluid volume flow rate (Q_K) to be passed via the cooling device can be adjusted without changing the hydraulic fluid volume flow rate (Q_S) to be fed to the lubrication circuit.

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