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Hydraulic section for load sensing applications and multiple hydraulic distributor

A hydraulic distributor, hydraulic technology, applied in fluid pressure actuators, soil movers/excavators, servo meter circuits, etc., can solve the problems of proportional reduction of user flow, damage to normal operation of machines, etc.

Inactive Publication Date: 2016-02-10
BUCHER HYDRAULICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there are some applications where a proportional reduction in certain user traffic can impair the normal operation of the machine

Method used

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  • Hydraulic section for load sensing applications and multiple hydraulic distributor
  • Hydraulic section for load sensing applications and multiple hydraulic distributor
  • Hydraulic section for load sensing applications and multiple hydraulic distributor

Examples

Experimental program
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Embodiment Construction

[0023] Referring to the drawings, 1 designates a hydraulic section for load sensing applications and 10 designates a multiple hydraulic distributor comprising a plurality of hydraulic sections 1 .

[0024] Each hydraulic section 1 comprises a valve body 2 within which a main slide 3 can slide longitudinally. This main slide 3 (also referred to as "spool") is used to transfer pressurized hydraulic fluid from the supply line Pal of the pump 100 to the working uses A, B through the metering orifice 4 .

[0025] For example, the main spool 3 is a six-way three-position type. Instead, the main spool 3 has four positions, ie it envisages an additional position (called "float" position) which discharges for the working uses A, B simultaneously. Specifically, the main spool 3 is supplied by a channel that coincides with the supply line Pal.

[0026] Upstream of the main spool 3 with respect to hydraulic fluid flow, pressure compensating means 5 are found which are able to maintain a...

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PUM

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Abstract

Hydraulic section (1) for use in a hydraulic distributor (10) comprising: a valve body (2) with a main spool (3); a piston (11); a flow regulating element (21) receiving the hydraulic fluid coming from a front chamber (30), the piston (11) having a head (12a) of the stem (12) engaged in the flow regulating element (21); an intermediate chamber (16) delimited by the stem (12) of the piston (11); control means (6, 7, 18) operatively active on the intermediate chamber (16) to alter its pressure so that the combined piston (11) - regulating element (21) system goes from a balance condition, in which the regulating element (21) is inactive, to a decoupling condition, in which the pressure of the front chamber (30) is decoupled from the pressure of the intermediate chamber (16).

Description

technical field [0001] The present invention relates to a hydraulic section for load sensing applications and multiple hydraulic distributors using one or more such hydraulic sections. Background technique [0002] Load sensing hydraulic systems are known to maintain an approximately constant pressure drop through the metering orifice of the spool valve. [0003] In particular, load sensing hydraulic systems can be used in operating machines where multiple movements are envisioned to be performed simultaneously. For example, consider an operating machine with a rotating tower, such as an excavator or telescopic loader, where rotation of the cab, extension of the boom, and movement of the bucket need to be handled independently of each other. [0004] In a conventional type of load sensing hydraulic system, the demand for higher flow than the maximum flow deliverable by the pump in turn causes the consuming unit with the maximum load to slow down and stop. This situation is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B13/02
CPCF15B13/0417F15B2211/30555F15B2211/781E02F9/2228F15B11/162F15B11/166
Inventor M·里瓦L·塔迪亚
Owner BUCHER HYDRAULICS