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Hydraulic Sections and Compound Hydraulic Distributors for Load Sensing Applications

A hydraulic distributor and hydraulic technology, applied in the direction of fluid pressure actuation device, fluid pressure actuation system safety, earth mover/shovel, etc., can solve problems such as only suitable for flow distribution, not suitable for priority operation, etc.

Inactive Publication Date: 2017-09-01
BUCHER HYDRAULICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] Some of the above solutions (such as WO2011 / 115647 and GB2445095) are not suitable for priority operation, but only for flow distribution

Method used

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  • Hydraulic Sections and Compound Hydraulic Distributors for Load Sensing Applications
  • Hydraulic Sections and Compound Hydraulic Distributors for Load Sensing Applications
  • Hydraulic Sections and Compound Hydraulic Distributors for Load Sensing Applications

Examples

Experimental program
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Embodiment Construction

[0035] Referring to the drawings, a hydraulic section for load sensing applications is indicated by numeral 1 , while a compound hydraulic distributor comprising a plurality of hydraulic sections 1 is indicated by numeral 10 .

[0036] Each hydraulic section 1 comprises a valve body 2 inside which a main spool 3 is longitudinally slidable. The main spool 3 (also called "shuttle") is used to selectively deliver pressurized hydraulic fluid from the supply line Pal from the pump 100 to the working ports A, B through the metering port 4 .

[0037] For example, the main strut 3 is a six-way three-position type. Alternatively, the main spool 3 may be of the four-position type, ie it contains an additional position (called "floating" position) which releases the two working ports A, B. Specifically, the main spool 3 is supplied through a channel that coincides with the supply line Pal.

[0038] A pressure compensating device 5 is present downstream of the main spool 3 and the devic...

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PUM

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Abstract

The present invention relates to hydraulic sections and compound hydraulic distributors for load sensing applications. A hydraulic section (1) for use in a hydraulic distributor (10), comprising: a valve body (2); a main spool (3); a pressure compensating device (5), which is accommodated in In the first hole in the valve body (2); the piston (11), the piston (11) is accommodated in the first hole; the intermediate chamber (16), the intermediate chamber (16) with the supply line (Pal) In fluid communication, the intermediate chamber (16) extends at least partially in the first bore and is delimited by the rod (12) of the piston (11); the two limiters (6, 7) and the Discharge channel (18) for changing its pressure and closing compensator (5).

Description

technical field [0001] The object of the present invention is a hydraulic section for load sensing applications and a compound hydraulic distributor using one or more of these hydraulic sections. Background technique [0002] As is well known, load sensing hydraulic systems make it possible to maintain a substantially constant pressure drop across the gauge port of the spool valve. [0003] In particular, load sensing hydraulic systems are found in work machines that provide simultaneous execution of multiple actions. For example, consider the case of a work machine with a rotating turntable, such as an excavator or a telescopic loader, where the rotation of the cab, the extension of the walls and the movement of the bucket must be managed independently of each other. [0004] In some work machines, for safety reasons it is necessary to prevent the movement of one or more hydraulic actuators when a hazardous working situation arises. Again for security reasons some functio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/02F15B20/00
CPCF15B13/0417E02F9/2228E02F9/2225E02F9/226E02F9/2267F15B11/05F15B2211/40553
Inventor L·塔迪亚M·里瓦
Owner BUCHER HYDRAULICS