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:
Feb. 14, 1984
Filed:
Jan. 21, 1981
Koji Kobayashi, Toyota, JP;
Keizo Kobayashi, Anjo, JP;
Aisin Warner Kabushiki Kaisha, Anjo, JP;
Abstract
The automatic transmission comprises a torque converter having a pump, a turbine, a stator and a direct-coupling clutch adapted to engage the pump with the transmission casing, and a transmission gear having multiple forward gears and a reverse gear. A lockup control valve comprising a spool on which a governor pressure and the force of a spring act oppositely, and a switch valve adapted to change-over the oil-hydraulic circuits for the release or the engagement of the direct-coupling clutch, are provided for the oil-hydraulic control circuit of the automatic transmission. The direct-coupling clutch can become engaged only if the governor pressure should exceed a predetermined pressure and the transmission be in a select high speed range.