Patent ID: 7025706
Filing Date: 2006-04-11
Classification: B60W,F16H,Y10T

Abstract:
1. A shift hydraulic apparatus for a vehicular automatic transmission, the automatic transmission being constituted by a torque converter and a continuously variable transmission, the shift hydraulic apparatus comprising: an upstream oil pump that is always driven by means of an engine associated with the automatic transmission; a clamp pressure regulating section, disposed on an upstream side hydraulic circuit with the oil pump as a hydraulic source, that regulates a clamp pressure of a belt of the continuously variable transmission; a clutch pressure regulating section, disposed on a downstream hydraulic circuit with a drain pressure from the clamp pressure regulating section, that regulates a clutching pressure of a forward clutch; a bypass circuit which enables the upstream side hydraulic circuit to communicate with the downstream side hydraulic circuit; a switching valve which enables a switching between a communication state of the bypass circuit and a non-communication state of the bypass circuit; and a switching valve controlling section that controls the communication state and the non-communication state of the bypass circuit through the switching valve.