Speed control system for a working vehicle
First Claim
Patent Images
1. A speed control system for a working vehicle comprising:
- a hydrostatic transmission (6) for propelling the vehicle, said hydrostatic transmission including a control shaft (9) for varying a swash angle,a control arm (10) extending from said control shaft and defining a fork portion in a free end thereof,manual control means (17) for manually controlling said hydrostatic transmission (6),a hydraulic cylinder (11) including a cylinder case (12) operatively connected to said control shaft (9) for varying the swash plate angle of said hydrostatic transmission (6),engaging means (12c) in an outer lateral wall of said cylinder case (12) for engaging said fork portion of the control arm and transmitting movement of the cylinder case to said control arm,a piston rod (14) fixed to a case (5) containing said hydrostatic transmission (6), anda control valve (15) fixed to said cylinder case (12) and including a spool (16) operatively connected to said manual control means (17), said cylinder case (12) being shiftable following a shift of said spool (16).
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Abstract
A speed control system for a working vehicle comprises a hydrostatic transmission for propelling the vehicle, a hydraulic cylinder and a control valve. The hydraulic cylinder includes a cylinder case operatively connected to a control shaft for varying a swash plate angle of the hydrostatic transmission, and a piston rod fixed to a case containing the hydrostatic transmission. The control valve is fixed to the cylinder case and includes a spool extending parallel to the hydraulic cylinder and operatively connected to a foot pedal for manually controlling the hydrostatic transmission. The cylinder case is shiftable following a shift of the valve spool.
42 Citations
13 Claims
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1. A speed control system for a working vehicle comprising:
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a hydrostatic transmission (6) for propelling the vehicle, said hydrostatic transmission including a control shaft (9) for varying a swash angle, a control arm (10) extending from said control shaft and defining a fork portion in a free end thereof, manual control means (17) for manually controlling said hydrostatic transmission (6), a hydraulic cylinder (11) including a cylinder case (12) operatively connected to said control shaft (9) for varying the swash plate angle of said hydrostatic transmission (6), engaging means (12c) in an outer lateral wall of said cylinder case (12) for engaging said fork portion of the control arm and transmitting movement of the cylinder case to said control arm, a piston rod (14) fixed to a case (5) containing said hydrostatic transmission (6), and a control valve (15) fixed to said cylinder case (12) and including a spool (16) operatively connected to said manual control means (17), said cylinder case (12) being shiftable following a shift of said spool (16). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A speed control system for a working vehicle comprising:
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a hydrostatic transmission (6) for propelling the vehicle, manual control means (17) for manually controlling said hydrostatic transmission (6), a hydraulic cylinder (11) including a cylinder case (12) operatively interconnected through a pair of pins (12d) projecting from an inward wall and an outward wall of said cylinder case (12) to a control shaft (9) for varying a swash plate angle of said hydrostatic transmission (6), a bifurcate control arm (10) extending from said control shaft (9) and having distal ends thereof each received between said projections (12c), a piston rod (14) fixed to a case (5) containing said hydrostatic transmission (6), and a control valve (15) fixed to said cylinder case (12) and including a spool (16) operatively connected to said manual control means (17), said cylinder case (12) being shiftable following a shift of said spool (16).
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13. A speed control system for a working vehicle comprising:
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a hydrostatic transmission (6) for propelling the vehicle, manual control means (17) for manually controlling said hydrostatic transmission (6), a hydraulic cylinder (11) including a cylinder case (12) operatively interconnected through a pair of pins (12d) projecting from an inward wall and an outward wall of said cylinder case (12) to a control shaft (9) for varying a swash plate angle of said hydrostatic transmission (6), a bifurcate control arm (10) extending from said control shaft (9) and engaged with said pins (12d), a pair of connecting plates (27) for connecting said pins (12d) and said control arm (10), a piston rod (14) fixed to a case (5) containing said hydrostatic transmission (6), and a control valve (15) fixed to said cylinder case (12) and including a spool (16) operatively connected to said manual control means (17), said cylinder case (12) being shiftable following a shift of said spool (16).
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Specification