Patent ID: 8616355
Filing Date: 2013-12-31
Classification: F16H

Abstract:
1. A hydraulic control device for use in an automatic transmission including a fluid transmission apparatus, a lockup clutch capable of locking up the fluid transmission apparatus, and an automatic speed change mechanism changing a speed of rotation transmitted from the fluid transmission apparatus and transmitting the changed speed to driving wheels, wherein the hydraulic control device comprises: an oil pump that is driven in accordance with rotation of a driving source; a working pressure regulating portion that regulates a working pressure based on an oil pressure generated by the oil pump; a first lubricant supply passage for supplying a back pressure of the working pressure to a lubricant passage for lubricating the automatic speed change mechanism; and a lockup switch mechanism that turns on/off the lockup clutch by switching a supply/discharge path of the working pressure to/from the fluid transmission apparatus, the hydraulic control device comprising: a second lubricant supply passage, which is different from the first lubricant supply passage, for supplying the working pressure to the lubricant passage, wherein the second lubricant supply passage includes a first oil passage for supplying the working pressure to the lockup switch mechanism and a second oil pressure for supplying the working pressure, which is supplied to the lockup switch mechanism from the first oil passage, to the lubricant passage from the lockup switch mechanism, the first oil passage and the second oil passage are disconnected from each other when the lockup clutch is turned on by the lockup switch mechanism.