Patent ID: 8825318
Filing Date: 2014-09-02
Classification: B60Y,F16H

Abstract:
1. An automatic transmission comprising: a mechanical oil pump configured to be driven by a rotation of an engine transmitted thereto; an intake passage through which a working oil suctioned into the mechanical oil pump flows; a discharge passage having a narrowed portion, through which the working oil discharged from the mechanical oil pump flows; a connecting passage that connects the intake passage to the discharge passage on an upstream side of the narrowed portion in a flow direction of the working oil while bypassing the mechanical oil pump; a flow control mechanism including a spool that is configured to set the connecting passage in a communicative state when a differential pressure between an oil pressure on the upstream side of the narrowed portion in the flow direction of the working oil and an oil pressure on a downstream side of the narrowed portion in the flow direction of the working oil exceeds a predetermined value, and is configured to set the connecting passage in a non-communicative state when the differential pressure is equal to or lower than the predetermined value; and a control device comprising: