公开(公告)号：US20030226416A1

公开(公告)日：2003-12-11

申请号：US10400154

申请日：2003-03-26

Applicant: KUBOTA CORPORATION

Inventor： Susumu Umemoto ,  Tetsuo Yamaguchi ,  Hidetoshi Hana ,  Isamu Kawai ,  Takashi Yasumi ,  Yoshifumi Horiuchi ,  Tetsu Fukui

IPC: F16H061/04

CPC classification number: F16H61/0437 ,  B60W10/02 ,  B60W10/10 ,  B60W10/14 ,  B60W30/18 ,  B60W30/1819 ,  B60Y2200/221 ,  B60Y2200/41 ,  F16H59/48 ,  F16H59/52 ,  F16H61/688 ,  F16H61/70 ,  F16H63/46 ,  F16H2059/147 ,  F16H2059/425 ,  F16H2061/0444 ,  F16H2306/14 ,  F16H2306/44 ,  F16H2306/52 ,  F16H2342/04 ,  Y10S477/90 ,  Y10S477/904 ,  Y10T74/19247 ,  Y10T74/19251 ,  Y10T74/1926 ,  Y10T477/65 ,  Y10T477/689 ,  Y10T477/69335

Abstract: A control apparatus (64) for a transmission. The transmission includes first and second transmission lines (7 8), (10, 11) disposed in parallel between an upstream transmission shaft (2) for receiving power from an engine (1) and a downstream transmission shaft (4) for transmitting the power to a traveling unit (53, 54); a hydraulic multiple disc transmission clutch (6) disposed transmission-wise upstream or downstream of the first and second transmission lines, the power of the upstream transmission shaft being transmitted via one of the first and second transmission lines to the downstream transmission shaft; a first gear change-speed mechanism (13) disposed between either the upstream transmission shaft or the downstream transmission shaft and the first transmission line, the first gear change-speed mechanism having a plurality of speed positions; a first actuator (35) for operating the first gear change-speed mechanism; a first friction clutch (9) incorporated in the first transmission line; a second gear change-speed mechanism (15) disposed between either the upstream transmission shaft or the downstream transmission shaft and the second transmission line, the second gear change-speed mechanism having a plurality of speed positions; a second actuator (37) for operating the second gear change-speed mechanism; and a second friction clutch (12) incorporated in the second transmission line. When the power is being transmitted via the first transmission line, a first controlling means operates the second gear change-speed mechanism into a predetermined speed position by means of the second actuator and operates the first friction clutch from a transmitting state to a non-transmitting state and simultaneously operates the second friction clutch from a non-transmitting state to a transmitting state, thereby to realize a progressive shifting of the transmission clutch from a transmitting state to a semi-transmitting state.