AUTOMATIC TRANSMISSION

摘要

An automatic transmission is provided. The transmission includes clutches coaxially arranged in layers in a radial direction of the transmission. The transmission includes a piston provided to each clutch, the pistons being aligned in the radial direction on a same plane perpendicular to an axis of the transmission, without overlapping with each other in an axial view. The transmission includes a common rotational member having a wall, commonly used for the clutches, and disposed at a predetermined position of the transmission in an axial direction, wherein the wall is formed along the plane. The transmission includes operational hydraulic passages parallely arranged in the wall of the common rotational member in a circumferential direction of the transmission on the same plane perpendicular to the axis, each of the operational hydraulic passages communicating with one of operational hydraulic chambers of the respective clutches.

主权项

1. An automatic transmission including a plurality of clutches coaxially arranged in layers in a radial direction of the automatic transmission, comprising:
a piston provided to each of the plurality of clutches, the pistons being aligned in the radial direction on a same plane that is perpendicular to an axis of the automatic transmission, without overlapping with each other in an axial view; a common rotational member having a wall, commonly used for the plurality of clutches, and disposed at a predetermined position of the automatic transmission in an axial direction, the wall formed along the plane perpendicular to the axis; and a plurality of operational hydraulic passages parallely arranged in the wall of the common rotational member in a circumferential direction of the automatic transmission on the same plane perpendicular to the axis, each of the plurality of operational hydraulic passages communicating with a respective operational hydraulic chamber of the respective clutches.