TRANSPORTATION VEHICLE - HITACHI CONSTRUCTION MACHINERY

Title:

TRANSPORTATION VEHICLE

Document Type and Number:

WIPO Patent Application WO/2011/135959

Kind Code:

A1

Abstract:

A control valve device (16) comprises two direction control valves (20, 21). The direction control valve (20) has an extension-side variable throttle unit (20c) and a contraction-side throttle unit (20d). The direction control valve (21) has an extension-side variable throttle unit (21c) and a contraction-side throttle unit (21d). A controller (35) determines that a hoist cylinder (10) is approaching a stop position, when the hoist cylinder (10) extends to raise or lower a vessel (3) and the hoist cylinder (10) is approaching the stop position. Based on this determination, the controller (35) uses the variable throttle units (20C, 20D) to variably adjust the flowpath surface area of the direction control valve (20) or uses the variable throttle units (21C, 21D) to variably adjust the flowpath surface area of the direction control valve (21), so that the expansion/contraction speed of the hoist cylinder (10) is increased or decreased according to the weight on the vessel (3) side.

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Inventors:

TAMURA KATSUMI (JP)
MINOSHIMA TOSHIKAZU (JP)
FUSHIKI MICHIO (JP)
KUROSAWA TAKAO (JP)

Application Number:

PCT/JP2011/057803

Publication Date:

November 03, 2011

Filing Date:

March 29, 2011

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACHINERY (JP)
TAMURA KATSUMI (JP)
MINOSHIMA TOSHIKAZU (JP)
FUSHIKI MICHIO (JP)
KUROSAWA TAKAO (JP)

International Classes:

B60P1/16; F15B11/00; F15B11/04

Domestic Patent References:

WO2008099691A1

2008-08-21

Foreign References:

JPS50114008U	1975-09-17
JPS6223744U	1987-02-13
JP2006052810A	2006-02-23
JPS5070383U	1975-06-21
JP2001105956A	2001-04-17

Other References: