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:
Jun. 04, 2002
Filed:
May. 10, 2000
Kazuo Okada, Tochigi-ken, JP;
Shouji Asatsuke, Tochigi-ken, JP;
Hiromitsu Ishibashi, Columbus, OH (US);
Shoichi Tanizawa, Tochigi-ken, JP;
Shinichi Nishio, Tochigi-ken, JP;
Tetsuya Mochizuki, Tochigi-ken, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
Shift valves are provided to switch oil passage connections to a state in which an oil pressure in one hydraulic clutch of an arbitrary speed transmission train and an oil pressure in a hydraulic clutch of a transmission train which is adjacent thereto as seen in the order of speed are controllable by a pair of linear solenoid valves . Skipped speed change from a predetermined first speed transmission train to a second speed transmission train which is not adjacent to the first speed transmission train is made possible. In concrete, a large-capacity accumulator A is connected to an oil passage L which is in communication with 5th-speed hydraulic clutch C . At the time of skipped speed changing from 5th speed to 3rd speed, shift valves are switched to a state of 3rd-4th speed change. The oil pressures in the hydraulic clutches C , C for 3rd and 4th speed transmission trains, respectively, are made controllable by the linear solenoid valves . While buffering the pressure decrease of the oil pressure in the 5th-speed hydraulic clutch C by the accumulator A , pressure increase control of 3rd-speed clutch C is carried out by one of the linear solenoid valves to thereby skip-downshift from 5th to 3rd speed. The other linear solenoid valve is held at a low-pressure waiting state to prepare itself for the 3rd-4th speed switch-upshifting.