Static water pressure loop pressure regulation valve with reduced input torsion required by static water pressure element

A pressure regulating valve, hydrostatic pressure technology, applied in the direction of servo meter circuit, fluid pressure actuation device, fluid pressure actuation system components, etc., can solve the problems that the manufacturer cannot guarantee, and achieve the effect of cheap manufacturing and torque reduction

Inactive Publication Date: 2005-01-26
SAUER DANFOSS NORDBERG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the manufacturer of the original equipment of the vehicle cannot guarantee that before starting the engine, intermediate conditions can be achieved

Method used

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  • Static water pressure loop pressure regulation valve with reduced input torsion required by static water pressure element
  • Static water pressure loop pressure regulation valve with reduced input torsion required by static water pressure element
  • Static water pressure loop pressure regulation valve with reduced input torsion required by static water pressure element

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Embodiment Construction

[0016] In the drawings, the same structures are given the same reference numerals. Figure 1 discloses an embodiment of the invention. The variable displacement hydraulic pump 10 is connected in closed circuit to the hydraulic motor 12 by means of a pair of system or working pressure lines 14 , 16 . Preferably, the pump 10 is a variable displacement pump having a fluid volume varying element 18 whose position is controlled by means of opposing servomechanisms 20 , 22 . Hydraulic motor 12 may be a constant displacement motor (as shown) or a variable displacement motor.

[0017] Pressure regulating valves 24 , 26 are connected to first and second system pressure lines 14 , 16 , respectively. Each pressure regulating valve 24, 26 includes a check ball 28 which is biased by a spring 30 to a position in which it cannot engage a seat 32 at the inlet of a line 34 which Connected to the cassette ejector or container 36 . Preferably, the pressure regulating valves 24, 26 are actuall...

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PUM

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Abstract

A hydrostatic loop dump valve for reducing the starting torque required for a hydrostatic unit includes a normally biased open dump valve connecting one or more of the system pressure lines to the reservoir. The dump valve(s) will automatically open and oil will drain out by gravity when the engine is not running. When the engine turns the hydrostatic unit at sufficient speeds to generate significant charge pressure, the dump valves will close and the unit will operate as normal. Thus, the input torque required to start the engine and the hydrostatic unit is minimized without damaging the hydrostatic unit.

Description

technical field [0001] The invention relates to the field of hydraulic transmission devices. More particularly, the present invention relates to a hydrostatic loop regulator that reduces the input torque required by the hydrostatic elements, particularly during cold oil starts. The use of closed loop or closed loop hydrostatic pressure transfer to propel tractors or other vehicles is known. Traditionally, the variable hydrostatic transmission device or element may be driven directly by the tractor's engine. During engine starting conditions in colder weather, the torque required to turn the hydrostatic element is much greater than during engine starting in warmer weather, especially during the stroke. The additional torque load from the hydrostatic elements can overload the engine starting system, making starting difficult or impossible in cold weather. Background technique [0002] If the hydrostatic variable element is set at 0 movement (ie neutral position), then the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/04F15B21/04F16H59/72F16H61/40F16H61/4131
CPCF16H2312/20F15B21/005F15B2211/76F15B2211/5159F16H61/4017F15B2211/5157F15B2211/528F15B2211/7058F16H59/72F15B2211/50536F16H61/4026F15B11/0406F16H61/4131F15B2211/20546F15B2211/40515F15B2211/428F15B2211/555
Inventor 史蒂文・H・格卢克大卫・K・沃尔斯多夫
Owner SAUER DANFOSS NORDBERG
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