The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 21, 1986
Filed:
Jul. 11, 1983
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
Disclosed is a control device for a direct clutch in a vehicular automatic transmission comprising: a fluid torque converter; an auxiliary transmission having plural stages of gear trains selectively connected to the output side of said torque converter, said gear trains having different gear-to-gear speed ratios, and a plurality of hydraulically operated frictional engagement means for actuating the gear trains; and a hydraulically operated direct clutch capable of directly coupling pump and turbine vane wheels of the torque converter together. The control device includes first and second branch passages extended from working fluid passages of one and another of the frictional engagement means, respectively, a first directional control valve interposed between the first branch passage as well as an oil tank and an intermediate passage, and a second directional control valve interposed between the second branch passage as well as the intermediate passage and a working fluid passage of the direct clutch. The control device thus constructed can make more comfortable and stable the vehicle travelling at the time of speed shifting operation and makes it possible to by far reduce fuel cost.