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Hydraulic steering device with variable ratio

A steering device and hydraulic technology, which is applied in the direction of non-deflectable wheel steering, steering mechanism, fluid steering mechanism, etc., and can solve the problem of inability to switch

Active Publication Date: 2020-04-17
DANFOSS POWER SOLUTIONS PARCHIM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The known solution of a hydraulic steering device with two or more rail displacers therefore has the disadvantage that in the event of partial failure of the oil supply, the inlet pressure of the steering device may exceed the return force of the compression spring of the switching valve , so that the first track displacer cannot switch to a smaller feed (emergency mode)

Method used

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  • Hydraulic steering device with variable ratio
  • Hydraulic steering device with variable ratio
  • Hydraulic steering device with variable ratio

Examples

Experimental program
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Embodiment Construction

[0020] Please see first Figure 1 to Figure 3 .

[0021] The hydraulic steering circuit mainly includes a supply pump (not shown), a steering device 1 and a regulating fluid cylinder (not shown) acting on the wheels and an oil tank (not shown).

[0022] The steering device 1 has an inlet connection point 2, an outlet connection point 3 and two hydraulic cylinder connection points 4 and 5, the inlet connection point 2 is connected to the supply pump, the outlet connection point 3 is connected to the fuel tank, and the hydraulic cylinder connection points 4 and 5 are working is connected to the adjusting cylinder and thus also to the wheel to be steered.

[0023] The main elements of the steering device 1 are the control valve 6 and one or more metering pumps 7 and 7' operating according to the orbital principle, for example, each metering pump may comprise an outer ring 8 with seven teeth and a gear 9 with six teeth.

[0024] Fitted in a housing 10 is a control valve 6 with a...

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Abstract

The present application relates to a hydraulic steering device. The hydraulic steering device comprises a rotatably mounted control valve, and a displacement system having more than one metering pump,wherein the control valve is mechanically connected to a rotor gear of a first metering pump via a control sleeve and is hydraulically connected to a cavity of the first metering pump via a rectification bore, the rotor gears of the adjacent metering pumps are mechanically connected to a spline shaft, the cavity of the first metering pump is hydraulically connected to the cavity of the next metering pump in parallel, and the cavity of the next metering pump is separated from the cavity of the first metering pump via one or more switching valves and is configured to be connectable with a return line. Furthermore, in the steering motion, one side of the switching valve is connected to the control valve via a pressure line, the pressure at a corresponding hydraulic cylinder connection pointis provided to the pressure line, and the other side of the switching valve is connected to an inlet connection point of the steering device.

Description

technical field [0001] The present application relates to a hydraulic steering device with variable ratio, having the features indicated in the preamble of claim 1 . Background technique [0002] Hydraulic steering devices of the general type are well known. [0003] EP1212231B1 discloses a hydraulic steering device with two or more metering pumps (rail displacers) hydraulically connected in parallel. In each example, a switch element is provided between two adjacent track displacers, the switch element can be switched between a power steering mode and an emergency steering mode, in the former mode, the fluid supply volumes of the multiple track displacers are in phase Plus, while in the latter mode only the first rail displacer feeds the hydraulic flow. [0004] For power steering mode, the pressure difference between the pump and the outlet connection point of the switching valve should be greater than the switching pressure of the compression spring of the spring-loaded...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/09B62D5/30
CPCB62D5/09B62D5/30B62D5/097B62D5/32B62D5/083B62D11/005
Inventor 托马斯·皮普斯厄尔哈德·贝格曼哈特穆特·沃斯伯格
Owner DANFOSS POWER SOLUTIONS PARCHIM GMBH