AUTOMATIC TRANSMISSION

摘要

In an automatic transmission, a connection member which connects a carrier of a planetary gear mechanism PGSa to a clutch hub of a clutch is made to abut on the carrier of the planetary gear mechanism PGSa in an abutting portion, a thrust bearing T2 is disposed between the connection member and a clutch drum of the clutch, a thrust bearing T1 is disposed between a transmission case and the clutch drum of the clutch, and a clearance between the thrust bearing T1 and the clutch drum of the clutch is adjusted by using a shim. Accordingly, a thrust load inputted from a sun gear Sb of a planetary gear mechanism PGSb can be transmitted to the transmission case without passing through a sun gear Sa, which rotates at a high speed, of the planetary gear mechanism PGSa, and friction loss is reduced.

主权项

1. An automatic transmission in which a plurality of planetary gear mechanisms disposed on an axis of an input shaft are housed in a transmission case and a predetermined gear is established by controlling a coupling relationship among elements of the plurality of planetary gear mechanisms, the input shaft, and the transmission case by using a plurality of clutches and a plurality of brakes, wherein
the automatic transmission comprises, as said plurality of planetary gear mechanisms: a planetary gear mechanism A in which elements are rotatable relative to each other; and a planetary gear mechanism B disposed adjacent to the planetary gear mechanism A, in which elements are rotatable relative to each other; the automatic transmission further comprises: as one of said clutches, a clutch disposed between the planetary gear mechanism B and the transmission case and capable of coupling a carrier of the planetary gear mechanism B to the input shaft; a connection member disposed inside a sun gear of the planetary gear mechanism B in a radial direction and connecting the carrier of the planetary gear mechanism B to a clutch hub of the clutch; an abutting portion in which an end portion of the connection member on the planetary gear mechanism A side abuts on the carrier of the planetary gear mechanism B; a bearing A disposed between the connection member and a clutch drum of the clutch and capable of supporting a thrust load; and a bearing B disposed between the transmission case and the clutch drum of the clutch and capable of supporting the thrust load.