| 摘要 |
1,259,336. Hydrostatic transmission control; lirikwork. NORTH AMERICAN ROCKWELL CORP. 5 Nov., 1969 [16 Jan., 1969], No. 54321/69. Headings F2D and F2K. A control linkage for a hydrostatic transmission having a variable displacement swash plate pump supplying pressure liquid to a fixed displacement motor comprises a control lever 32 movable in a gate 33 to selectively engage and rotate arms 62, 91 fast with hubs 21, 19 carrying levers 63, (95) respectively connected through Bowden cables 76, 103 to a park lock mechanism and to a swash plate adjusting mechanism. The control lever 32 is pivoted at 24 to a block 16 which is pivotable on a shaft 14 perpendicular to the axis 24. A spring 59 biasses the lever 32 towards a neutral position in which it engages a recess 61 in the arm 62. In the neutral position the lower end 23 of the lever 32 rotates anticlockwise a plate 35 which acts through a Bowden cable 49 on a by-pass valve to divert pressure liquid from the pump to a reservoir. The plate 35 is additionally connected by a rod 46 to a switch 45 which only permits starting of a driving engine during neutral. Movement of the lever 32 along a slot 60 of the gate 33 towards a park position rotates the arm 62, hub 21 and lever 63 which acts through the Bowden cable 76 to move a fixed pin into engagement with a rotational component of the hydraulic motor. Movement of the lever 58 across the slot 58 away from the neutral position and towards the arm 91 causes clockwise rotation of the plate 35 which acts through a Bowden cable 49 on the by-pass valve to connect the pump to the motor. Thereafter movement of the lever 32 along a slot 81 of the gate rotates the arm 91, hub 19 and lever (95) which acts through the Bowden cable 103 to adjust the pump swash plate for forward or reverse drive. Ball detents 83, 92 locate the arms 62, 91 in their central positions. Lost motion spring connections may be provided in the linkages to the park lock and swash plate adjusting mechanism. In Figs. 12-14 (not shown) the arm (91) is resilient and in the neutral position engages between lugs (116, 117) to prevent inadvertent swash plate adjustment. Movement of the lever (32) across the slot (58) away from the neutral position moves the arm (91) against its spring bias away from the lugs (116, 117). In Figs. 12 and 15 (not shown) a spring finger (126) holds the lever (32) in the park position. In Fig. 16 (not shown) the arm (62) is resilient and, in the park position, holds the lever (32) in a recess (131). |
