Control mechanism for compound transmission of transport vehicle

摘要

PCT No. PCT/SU88/00008 Sec. 371 Date Aug. 30, 1989 Sec. 102(e) Date Aug. 30, 1989 PCT Filed Jan. 7, 1988 PCT Pub. No. WO89/06194 PCT Pub. Date Jul. 13, 1989.A compound transmission for a transport vehicle which has a manually operated main gearbox and an auxiliary two-range gearbox tandemly connected therewith and having a high-gear range and low-gear range shifting by a servo actuator. A control mechanism of this compound transmission comprises a device applicable for use as a fail safe device in manual shifting the auxiliary gearbox to low-gear range in case of failure of the servo actuator of the auxiliary gearbox while it is in the high-gear range. The control mechanism is provided with four sliders. The first second and third sliders are shifted by the drive element connected with the manually operated hand lever. The fourth slider is shifted by the servo actuator. The first and the second sliders engage the forward speeds in the main gearbox. The third slider engages the reverse speed in the main gearbox. The fourth slider engages the low-gear range and the high-gear range in the auxiliary two-range gearbox. The fail safe device is a first rest connected with the fourth slider for joint movement and a second rest located opposite the first rest for interaction with the latter and connected with the third slider for joint movement. This device moves forth slider to the low-gear range position when the third slider is shifted from the neutral position to the reverse speed-engaging position by the drive element.