| 摘要 |
<p>1473059 Hydrostatic transmission control; linkwork TOWMOTOR CORP 15 Oct 1975 [30 Jan 1975] 42220/75 Headings F2W and F2K The variable displacement pump 14 of a hydrostatic transmission and the control lever 22 of a prime mover 16 are conjointly controlled by a single control member 26 which is pivoted in either direction from a neutral position to adjust the pump 14 for forward or reverse drive, by pivoting a pump control member 24, and to adjust the control lever 22 to increase prime mover power, the control lever 22 being moved in the same direction whether the pump is adjusted for forward or reverse and the linkage connecting the pump control member 24 and the control member 26 including a resilient link 42 so that the prime mover power can be further increased after the pump has been adjusted to maximum displacement. The control member 26 comprises a pedal, pivoted to adjust pump control member 24 through link 31, bell crank 34 and resilient link 42 (Fig. 2, not shown). Pivoting of pedal 26 also rotates a rod 37 which has a link 61 at one end to which two links 62 and 63 are pivoted. Links 62 and 63 are pivoted to links 68 and 69 respectively, rotatably mounted on a rod 71 which has a pin 79 passed through it, engaged by a pin 81 of link 68 for one direction of pivoting of pedal 26 and engaged by a pin 82 of link 69 for the other direction of pivoting of pedal 26. Thus the rod 71 pivots in the same sense for forward or reverse pivoting of pedal 26 and, through links 74 and 76, pivots the prime mover control 22 in the same direction. Prime mover 16 can be such as to be controlled by a throttle lever, governor rack or rheostat. The pump 14 is controlled through a valve assembly 23. An inching pedal 83 is provided, it moving a valve spool 84 of the valve assembly 23. The linkage may be spring biased to return the transmission to neutral on release of pedal 26. The vehicle shown is an industrial lift truck, hydraulic motors 19 driving wheels 21.</p> |
