| 摘要 |
<p>1497770 Linkwork; hydrostatic transmission control CATERPILLAR TRACTOR CO 29 June 1976 [24 Nov 1975] 26988/76 Headings F2K and F2W A pedal 10 pivotally mounted on a shaft 14 actuates a lever 62 through linkage 20, 26, 34, 54 and a pin 60 engaging a slot 64 in the lever whereby depression of the pedal causes the lever to be actuated in either direction about its pivot 66 in dependence upon the position of the pin in the slot, the pedal also actuating means 801 through linkage 36, 40, 44, 52, 78<SP>1</SP>. The apparatus is suitable for control of a vehicle such as a lift truck in which the means 80<SP>1</SP> constitutes an engine throttle or governor, and forward or reverse drive of a hydrostatic transmission is determined by the direction of displacement of the lever 62 which actuates a valve or mechanism 68 controlling pump displacement. A link 72 connected between an anchorage 76 and the link 54 contains a pair of solenoids of which is energized by depression of the pedal through a reverse or a forward switch 78 or 80 to extend or shorten the link 72 to position the pin 60 at either end of the slot 64. If the pedal is depressed by a foot positioned between the switches the engine is accelerated but the pin 60 remains in its neutral position, shown, in which it does not operate the lever 62, a lost-motion device 56 in the link 54 allowing depression of the pedal. In a modification the solenoids are replaced by hydraulic means controlled by valves in place of the switches 78, 80.</p> |
