| 摘要 |
463,683. Fluid-pressure servomotors. GENERAL MOTORS CORPORATION. Oct. 3, 1935, No. 34532/36. Convention date, Oct. 8, 1934. Divided out of 463,643. [Class 135] [Also in Group XXIV] Control mechanism for stepwise change-speed gearing is conjoint between a speedresponsive device driven from one of the shafts and an engine control means which. act on snap-action valve mechanism of fluid-pressure servo means for effecting speed changes, there being further control means by which the operator can override the said conjoint control. Pumped oil is delivered to a manifold at 136, and 140 is the snap-action valve. A snap spring 160 snaps a toggle 157, 158 about a fixed pivot 156, and there is a bias spring 164 holding the valve 140 normally in the position shown with the oil cut off from a speed-changing servomotor 138, and an automatic two-speed unit held in high speed. The conjoint control is applied at 167 through a floating lever 166, a speed-responsive governor 211 acting through a link 170 on a lower fulcrum 169, and the accelerator, not shown, acting through a shaft 173 on a middle fulcrum 175. The over-riding control acts through the shaft 173 on the fulcrum 175 to force the valve 140 open, that is to force a down-shift in the automatic unit, all as described in Specification 463,643. In the arrangement described, there is a second or manual control for a second transmission unit, said control acting through a crank 192 on a second snap-action valve 140<1>, all as described in the Specification referred to. |
