| 摘要 |
PURPOSE:To prevent danger such as the abrupt stop of a vehicle by making an output shaft irrotational when a hydraulic control mechanism is in first forward speed with no accelerator pedal depressed, and thereby concurrently releasing the operation by means of oil pressure produced at the time of more than second forward speed. CONSTITUTION:The creep control device of an automatic transmission is equipped with a torque converter 100, an output shaft 9 connected with the driving wheel side, a transmission having a gear shifting mechanism 101 which actuates the driving force of the torque converter in gear shifting at the gear ratio of at least first forward speed or second forward speed so as to transfer it to the aforesaid output shaft 9, and can concurrently control the output shaft to be made irrotational, and with a hydraulic control mechanism 700 which controls the operation of the gear shifting mechanism by oil pressure. The hydraulic control mechanism 700 is actuated in such a way as to make the output shaft 9 irrotational at the time of first forward speed with no accelerator pedal depressed, and the actuation of it is released by a D-creep control valve 340 which is actuated by oil pressure produced at the time of more than second forward speed. This constitution can thereby prevent the occurrence of the D-creep phenomenon of a vehicle and the like when no accelerator pedal depressed. |
