Automatic transmission
AssigneeJATCO Ltd
InventorsKazuo Oguri, Hideo Kawamatsu
Life of this patent
Estimating the term…
Abstract
An automatic transmission includes a planetary gear train of first, second, third and fourth planetary gears; an input rotation member connected with a ring gear of the second planetary gear; and a first connection member connecting a carrier of the second planetary gear and a ring gear of the fourth planetary gear. A first rotation sensor senses the rotation speed of the first connection member. A second rotation sensor senses the rotation speed of one rotating element of the first and second planetary gears. A processing section calculates an input speed of the automatic transmission from the rotation speeds sensed by the first and second rotation sensors.
Claims14
An automatic transmission comprising:
- a planetary gear train including first, second, third and fourth planetary gears arranged in order of mention from an input shaft's side toward an output shaft's side, the first and second planetary gears being combined to form a planetary gear set in which two of three rotating elements of the first planetary gear are connected, respectively, with two of three rotating elements of the second planetary gear;
- an input rotation member which extends from an input shaft radially outwards between the second and third planetary gears and which is connected with a ring gear of the second planetary gear;
- a first connection member including a first end portion connected with a carrier of the second planetary gear between the first and second planetary gears, a second end portion connected with a ring gear of the fourth planetary gear, and an intermediate portion surrounding the second and third planetary gears;
- an engaging device group to determine a gear ratio of the planetary gear train;
- a first rotation sensor to sense a rotation speed of a first rotary member which is the first connection member;
- a second rotation sensor to sense a rotating speed of a second rotary member which is a rotating element of the planetary gear set and which is arranged to rotate at a speed different from the rotating speed of the first connection member;
- and
- a processing section to calculate a rotation speed of the input shaft from the rotating speeds sensed by the first and second rotation sensors.
An automatic transmission comprising:
- a planetary gear train including first, second, third and fourth planetary gears, the second and third planetary gears being located axially between the first and fourth planetary gears, the second planetary gear being located axially between the first and third planetary gears;
- an input shaft which is enclosed by the first planetary gear and which is connected with a ring gear of the second planetary gear member by an input rotation member extending between the second and third planetary gears;
- a first connection member including a first end portion connected with a planet carrier of the second planetary gear between the first and second planetary gears, a second end portion connected with a ring gear of the fourth planetary gear, and an intermediate portion surrounding the second and third planetary gears;
- a first rotation sensor to sense a rotation speed of the first connection member;
- a second rotation sensor to sense a rotating speed of a carrier of the first planetary gear;
- and
- a processing section to calculate an input speed of the input shaft from the rotating speeds sensed by the first and second rotation sensors.
Dependencies are inferred from the claim text.