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:
May. 06, 2003
Filed:
Feb. 13, 2002
Masahiro Hayabuchi, Anjo, JP;
Masaaki Nishida, Anjo, JP;
Satoru Kasuya, Anjo, JP;
Kenji Gotou, Anjo, JP;
Toshihiko Aoki, Anjo, JP;
Aisin AW Co., Ltd., Anjo, JP;
Abstract
A multi-speed automatic transmission improves transmission efficiency by reducing drag loss due to high speed rotation of a freely rotating element of a planetary gear set. An automatic transmission for a vehicle includes: an input path T of a first speed ratio; an input path T which has a larger speed ratio than this input path T ; a planetary gear set of four elements, wherein the four elements are a first element, a second element, a third element, and a fourth element following an order of elements on a speed diagram; a clutch C- transmitting a rotation of the input path T to the first element S ; a clutch C- transmitting the rotation from the input path T to the fourth element S ; a clutch C- transmitting a rotation from the input path T to the first element; a clutch C- transmitting the rotation from the input path T to the second element C ; a brake B- engaging the fourth element; a brake B- engaging the second element; and an output member coupled with the third element R . Accordingly, drag resistance is prevented from increasing because no extremely high speed rotation of the freely rotating element is generated, even when a speed is achieved using any combination of the engagement elements.