Patent ID: 8403117
Filing Date: 2013-03-26
Classification: F16H

Abstract:
1. A hydraulic control device controlling a lockup clutch included in a fluid-type power transmitting device, comprising: a first oil passage communicated with an engagement-side oil chamber for engaging the lockup clutch to be engaged/released based on an oil pressure to supply an engagement oil pressure to the engagement-side oil chamber at engagement including slip state of the lockup clutch; a second oil passage communicated with an release side oil chamber for releasing the lockup clutch to supply a release oil pressure to the release-side oil chamber at release of the lockup clutch; a third oil passage communicated with the engagement-side oil chamber of the lockup clutch to discharge operating oil in the engagement-side oil chamber at the slip state of the lockup clutch; and a discharge inhibiting means that inhibits discharge of the operating oil from the third oil passage at the release of the lockup clutch with the release oil pressure supplied from the second oil passage to the lockup clutch.