IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0550260
(1983-11-10)
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우선권정보 |
DE-0041793 (1983-11-11) |
발명자
/ 주소 |
- Eckhardt, Erich
- Schmitt, Karl
- Grone, Wolfgang
- Binev, Binio
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출원인 / 주소 |
|
대리인 / 주소 |
Buell, Ziesenheim, Beck & Alstadt
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인용정보 |
피인용 횟수 :
8 인용 특허 :
1 |
초록
▼
Vehicles with differential speed steering are provided having a hydrostatic transmission on each side for driving the drive wheels on that side, a spring-loaded servo piston operating a final control element of each transmission, at least one control pressure pick-off connected to the operating cyli
Vehicles with differential speed steering are provided having a hydrostatic transmission on each side for driving the drive wheels on that side, a spring-loaded servo piston operating a final control element of each transmission, at least one control pressure pick-off connected to the operating cylinders for controlling forward and backward travel, a pair of second control pressure pick-offs connected with the operating cylinders for controlling turning, a manually controlled pilot valve in a connection between the second control pick-offs and the operating cylinder and a control pressure reducing valve acting on the second control pressure pick-offs reducing the pressure to prescribed characteristics independently of the incoming pressure with respect to the actuation path.
대표청구항
▼
1. A control for the drive of a vehicle with differential speed steering comprising a pair of hydrostatic transmissions for independently driving the drive wheels of each side of the vehicle, a final control element on each of said pair of transmissions movable for controlling the direction and spee
1. A control for the drive of a vehicle with differential speed steering comprising a pair of hydrostatic transmissions for independently driving the drive wheels of each side of the vehicle, a final control element on each of said pair of transmissions movable for controlling the direction and speed of each of said transmissions, a spring-loaded servo piston connected to each final control element for moving said final control element, an operating cylinder slidably carrying said spring-loaded servo piston, a pressure chamber in said cylinder on each side of the servo piston whereby the servo piston may be acted upon by a selectively adjustable control pressure, at least one control pressure pick-off for controlling the forward and backward travel of the vehicle connected with each of the operating cylinders of the hydrostatic transmission on each side of the vehicle, a pair of additional control pressure pick-offs, each one assigned to one direction of turning connected with each of the operating cylinders of the drive unit whereby one servo piston for controlling the direction and speed of travel can be acted upon on the one side representing the inside of the turn by the control pressure pick-off assigned to said control and the other operating cylinder on the other side representing the turning radius can be acted upon by a control pressure from the pick-off on the outside of the turn, a connection between each control pressure pick-off and the corresponding operating cylinder, a pilot valve in said connection, a direction and speed lever connected to said pilot valves whereby the pilot valves are operated to control the flow of fluid to said operating cylinders, and wherein the control pressure pick-off that reduces the control pressure of each control pressure pick-off assigned to a turning direction is a control pressure reducing valve that reduces the pressure with prescribed characteristics following a preselected movement without pressure change and independently of the magnitude of the incoming pressure with respect to the control pressure pick-off that controls travel. 2. In a control for the drive of a vehicle with differential speed steering and with a hydrostatic transmission for the drive of the drive wheels of each side of the vehicle, a final control element of each of the two transmissions connected with a spring-loaded servo piston capable of sliding in an operating cylinder for moving the final control element to control the direction and speed of each of said transmissions, a pressure chamber provided on each side of the servo piston in the operating cylinder, the servo piston acted upon by a selectively adjustable control pressure, at least one control pressure pick-off assigned for controlling the forward and backward travel and selectively connected with the operating cylinders of the transmission of the two vehicle sides, two additional control pressure pick-offs, each one assigned to one direction of turning and selectively connected with the operating cylinder of the drive unit of the vehicle side on the inside of a turn, each servo piston for controlling the direction and speed of travel being acted upon on the one side by the control pressure pick-off assigned to this control, and for controlling the turning radius on the other side, being acted upon by a control pressure pick-off of the pair assigned to turning, a pilot valve selectively controlled as a function of the switching state of an selectively actuable direction and speed selection lever located in the connection line between a control pressure pick-off assigned to the turning and the operating cylinder of the assigned drive unit, said pilot valve connecting this control pressure pick-off assigned to turning with the second pressure chamber of the operating cylinder of the drive unit on the inside of the turn, the second pressure chamber of which is acted upon by the control pressure pick-off determining the control pressure of travel speed and direction, the control pressure pick-off assigned to one direction of turning of the control pressure pick-off pair determining the direction and radius of turning being a control pressure pick-off that with slight actuation first reduces the control pressure in the pressure chamber of the operating cylinder acted upon by the control pressure pick-off determining the direction and speed of travel and furnishes a control pressure only with greater actuation on the opposite side of the servo piston and is connected at least with its pressure-building section for supplying pressure to the outlet of the control pressure pick-off determining the travel speed, the improvement wherein the control pressure pick-off section that reduces the control pressure of each control pressure pick-off assigned to a turning direction is a control pressure reducing valve that reduces the pressure with prescribed characteristics following a preselected movement of said valve without pressure change and independently of the magnitude of the incoming pressure with respect to the control pressure pick-off that controls travel. 3. Control according to claim 1 or 2 characterized in that the control pressure reducing valve has a valve piston with a two-edged control function that is capable of sliding in a borehole against the force of a spring, one face of said piston being acted upon by the pressure fed in and the other, spring-loaded face being acted upon by the pressure acting on the operating cylinder, the spring extending between said other face and an actuating member connected to said direction and speed lever. 4. Control according to claim 3, wherein an actuating lever is connected with the actuating member in a position fixing manner whereby the actuating member may be selectively fixed in position relative to the valve piston. 5. Control according to claim 1 or 2 characterized in that the control pressure pick-off assigned to the control of travel is connected to a hand lever and each of the control pressure pick-offs assigned to the turning control is connected to a pedal. 6. Control according to claim 5, wherein at least the control pressure pick-offs controlling the travel movement are located in a control valve block with control levers for the valve block projecting out of the housing located adjacent to the actuating hand lever and pedal. 7. Control according to claim 1 or 2 having a maximum load regulator that lowers the control pressure. 8. Control according to claim 7, characterized in that the maximum load regulator is a pressure-relief valve inserted between an auxiliary control pressure pump and the travel control pressure pick-off. 9. Control according to claim 8 wherein the maximum load regulator is a pressure-relief valve connected with a brake pedal. 10. Control according to claim 9 having a drive with a brake that is loaded by an energy reservoir and can be released by hydraulic pressure, and wherein a device that reduces the brake pressure when a brake pedal is actuated is provided. 11. Control according to claim 10 having a kinematics that first actuates the pressure-relief valve when the brake pedal is actuated and the valve that reduces the brake pressure on the subsequent acutation path, and connects the brake pedal with the pressure-relief valves. 12. Control according to claim 10 wherein the control pressure reducing valve connected with the brake pedal has the same construction as each of the pressure reducing control pressure pick-offs assigned to turning. 13. Control according to claim 8 wherein the maximum load regulator is a safety valve that shuts off the control pressure feed and connects the lines leading to the control pressure pick-offs with a pressureless drain. 14. Control according to claim 8 wherein the maximum load regulator is a maximum control valve that reduces the control pressure when the drive r.p.m. of the drive unit pumps below a prescribed minimum value. 15. Control according to claim 14 having restrictors in the control pressure lines, and wherein the restrictors are located in the control pressure lines in the direction of flow beyond the control pressure pick-offs assigned to turning control and in front of the connection of the line leading to the maximum load regulator. 16. Control according to claim 8 having restrictors in the control pressure lines, and wherein the restrictors are located in the control pressure lines in the direction of flow beyond the control pressure pick-offs assigned to turning control and in front of the connection of the line leading to the maximum load regulator. 17. Control according to claim 7, wherein the maximum load regulator is a pressure-relief valve connected with a brake pedal. 18. Control according to claim 17 having a drive with a brake that is loaded by an energy reservoir and can be released by hydraulic pressure, and wherein a device that reduces the brake pressure when a brake pedal is actuated is provided. 19. Control according to claim 18, having a kinematics that first actuates the pressure-relief valve when the brake pedal is actuated and the valve that reduces the brake pressure on the subsequent actuation path, and connects the brake pedal with the pressure-relief valves. 20. Control according to claim 18, wherein the control pressure reducing valve connected with the brake pedal has the same construction as each of the pressure-reducing control pressure pick-offs assigned to turning control. 21. Control according to claim 7, wherein the maximum load regulator is a safety valve that shuts off the control pressure feed and connects the lines leading to the control pressure pick-offs with a pressureless drain. 22. Control according to claim 7, wherein the maximum load regulator is a maximum-load control valve that reduces the control pressure when the drive r.p.m. of the drive unit pumps drops below a prescribed minimum value. 23. Control according to claim 22 having restrictors in the control pressure lines, and wherein the restrictors are located in the control pressure lines in the direction of flow beyond the control pressure pick-offs assigned to turning control and in front of the connection of the line leading to the maximum load regulator. 24. Control according to claim 7, having restrictors in the control pressure lines, and wherein the restrictors are located in the control pressure lines in the direction of flow beyond the control pressure pick-offs assigned to turning control and in front of the connection of the line leading to the maximum load regulator.
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