Patent
Hydraulic control apparatus
Svend Erik Thomsen,Erik Kyster,Sorensen Soren Nygard +2 more
- 14 Jun 1982
16
TL;DR: In this article, an open center valving with slot shaped orifices and flat generally wedge shaped throttle passages is proposed to minimize the noise and cavitation problems in a turning operation with a steering wheel.
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Abstract: The invention relates to a hydrostatic steering control unit of the type having valving for an open center neutral position which bypasses pressurized fluid from the pump to the tank when in neutral. During a turning operation with a steering wheel the open center valving is caused to close and the pressurized fluid is directed to one side or the other of a servomotor which is connected to wheels to be steered. The open center valving includes orifices in relatively rotatable elements which are aligned in the neutral position and closed to effect the turning operation. Open center valving can be the cause of noise and cavitation and such valving herein is provided with slot shaped orifices and flat generally wedge shaped throttle passages to minimize the noise and cavitation problems. The throttle passages are defined by curved bounding surfaces having rectangularly shaped outlines.
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Citations
Patent
Open-center steering control unit with flow amplification
Herman P. Schutten,Dwight Bruce Stephenson,Donald Melvin Haarstad +2 more
- 07 Mar 1990
TL;DR: In this paper, an open-center fluid controller is described for controlling the flow of fluid to a steering cylinder, which includes a fluid meter and valving arrangement, including a valve spool (43) and a sleeve (45), which define a main fluid path.
22
Patent
Steering control valve with contoured control surfaces
George M. Harpole,Herman W. Behrens,Michael F Wolff,Jane Ming-Chin Lin +3 more
- 24 Aug 1993
TL;DR: In this article, the authors define a flow gap for flow of hydraulic fluid from the groove in the sleeve to the flow gap in the core, which is defined by axially extending land and an axially-extending groove.
13
Patent
Modular pressure set and system for stamping press
Wendell J. Wagner
- 09 Sep 1996
TL;DR: In this paper, a pressure set for use in a stamping press has a pressure cylinder placed between an upper and lower plate of the pressure set, and an adjustable pressure regulating means is coupled to the cylinder for changing the pressure applied between the two plates.
11
Patent
Rotary valve for hydraulic power steering with reduced noise and linear boost characteristic
Roeske Klaus Juergen
- 15 Jan 1993
TL;DR: A rotary valve with chamfers (26, 39) at the groove edges (31) of its input-shaft (10) which, in conjunction with axially extending troughs (44), form metering edge contours.
10
Patent
Rotary valve for power steering gear
Andrew Donald Thomas
- 03 May 1996
TL;DR: In this paper, a rotary valve for a hydraulic power steering gear is ported as a network such that they form primary and secondary hydraulic Wheatstone bridges arranged in parallel, each bridge comprising two limbs each of which incorporate inlet and return orifices communicating to respective inlet ports of the valve.
10
References
Patent
Rotary valve with curved valve slot
Arthur E Bishop
- 26 Feb 1969
TL;DR: In this article, a valve core for cooperation with a hydraulic valve sleeve is described, where the core is provided with a plurality of longitudinally extending grooves constructed by a rolling operation in a manner permitting almost limitless variations in exact valveland contour.
18
Patent
Variable discharge aerosol spray nozzle
Frank Venus
- 14 Sep 1970
TL;DR: A spray nozzle is disclosed for a fluid dispenser, consisting of a button mounted on the end of a product discharge tube or valve stem of the dispenser as mentioned in this paper, which has a discharge orifice through which the fluid product is sprayed, and the button and stem are formed in their mating surfaces to provide a variable restriction to discharge of fluid from the orifice.
12
Patent
Pressure medium control system for auxiliary power steering systems
Dieter Elser
- 12 Oct 1978
TL;DR: In this article, a rotary plug valve journaled at opposite ends in a control bushing having conduit channels in fluid communication with passage grooves in the plug valve to form a plurality of parallel flow paths between a pressure inlet and two directional outlets to the servomotor.
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