LOAD CONTROLLER FOR HYDRAULIC TRANSMISSION DEVICE FOR WORKING VEHICLE

Title:

LOAD CONTROLLER FOR HYDRAULIC TRANSMISSION DEVICE FOR WORKING VEHICLE

Document Type and Number:

WIPO Patent Application WO/2004/102043

Kind Code:

A1

Abstract:

A load controller for a hydraulic transmission device for a working vehicle, where structural components for load control is prevented from deteriorating and the load controller can be downsized and simplified in its structure. In a working vehicle, power from an engine (E) is divided to a working machine system and a travel system and drive them. The travel system has a hydraulic transmission device (1). In the hydraulic transmission device (1), a hydraulic pump (2) driven by the engine (E) and a hydraulic motor (4) driven by the pump (2) are connected by a closed hydraulic circuit. The load controller has a bypass oil-path (8), an opening/closing valve (9), and an opening/closing valve-controlling means. The bypass oil-path (8) connects an oil path (3a), of the closed circuit, that is on the high-pressure side in forward traveling to an oil path (3b) that is on the low pressure side in forward traveling or to an oil tank (T). The opening/closing valve (9) opens and closes the bypass oil-path (8). The opening/closing valve- controlling means senses load on the engine (E) during work traveling and increases the degree of opening of the opening/closing valve (9) as the load increases.

Inventors:

YASUDA TOSHIFUMI (JP)
SAKIKAWA SHIGENORI (JP)
OHTSUKI KAZUHIKO (JP)

Application Number:

PCT/JP2004/005287

Publication Date:

November 25, 2004

Filing Date:

April 14, 2004

Export Citation:

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Assignee:

KANZAKI KOKYUKOKI MFG CO LTD (JP)
YASUDA TOSHIFUMI (JP)
SAKIKAWA SHIGENORI (JP)
OHTSUKI KAZUHIKO (JP)

International Classes:

F16H61/40; F16H61/4035; F16H61/4052; F16H61/46; F16H61/465; F16H47/02; F16H59/14; F16H59/42; (IPC1-7): F16H61/40

Foreign References:

JPH10252877A	1998-09-22
JPS53104886U	1978-08-23
JPH06265013A	1994-09-20
JPH09100909A	1997-04-15

Other References: