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. 22, 2004
Filed:
Feb. 06, 2003
Wataru Ishimaru, Kanagawa, JP;
Yasuo Sumi, Kanagawa, JP;
Jatco LTD, Fuji, JP;
Abstract
A gear speed-changing apparatus can be obtained having made the degree of freedom for selecting a gear ratio higher than that of the case using the Ravigneaux type composite planetary gear train, while achieving a strength advantage (e.g., the gear strength or gear lifetime) of the gear train, an improvement in fuel economy, the coaxial layout of the input portion and the output portion and the size reduction of the automatic transmission altogether. The apparatus achieves six forward speeds and one reverse speed by engaging/disengaging three clutches C , C and C and two brakes B and B properly. One G of three planetary gearsets G , G and G is a speed-reducing device for reducing input speed always. One G of the remaining two planetary gearsets G and G is a double sun gear type planetary gearset, the carrier PC of which has a center member CM for inputting or outputting a rotation from between two sun gears S and S . An intermediate wall for defining the inside of a transmission case into one side and the other side, is provided with cylinder chambers of brakes B and B , and a supporting portion for supporting a member serving as a clutch drum of the third clutch C