Title:
SPEED CONTROLLER OF WHEEL TYPE HYDRAULIC TRAVELING VEHICLE
Document Type and Number:
WIPO Patent Application WO/2002/021023
Kind Code:
A1
Abstract:
A speed controller of a wheel type hydraulic traveling vehicle, comprising a pair of variable displacement hydraulic pumps each having a control valve, wherein, when a very low speed running is instructed by the on operation of a very low speed switch, one control valve is fixed to a neutral position by a solenoid valve, and the tilting of a traveling motor is fixed to the maximum tilt by another solenoid valve, whereby the upper limit of the motor speed can be reduced remarkably, and the extremely low speed traveling can be realized by the full operation of an accelerator pedal without delicately operating the accelerator pedal.
Inventors:
ISHIMARU HIDEHARU (JP)
SHINYA TOSHIHIKO (JP)
SHINYA TOSHIHIKO (JP)
Application Number:
PCT/JP2001/007837
Publication Date:
March 14, 2002
Filing Date:
September 10, 2001
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
ISHIMARU HIDEHARU (JP)
SHINYA TOSHIHIKO (JP)
ISHIMARU HIDEHARU (JP)
SHINYA TOSHIHIKO (JP)
International Classes:
B60W10/06; F02D29/04; F16H61/42; F16H61/423; F16H61/431; F16H61/433; F16H61/444; F16H61/46; F16H61/47; B60K17/10; F16H59/44; (IPC1-7): F16H61/44; F16H61/42; B60K41/16; F02D29/04
Foreign References:
| JPS4845753A | 1973-06-29 | |||
| JPS55149647U | 1980-10-28 | |||
| JPS4729806B1 | 1972-08-04 | |||
| JPH0650955U | 1994-07-12 | |||
| JPH0234440A | 1990-02-05 | |||
| JP2000273736A | 2000-10-03 | |||
| US4766779A | 1988-08-30 | |||
| US5249422A | 1993-10-05 |
Other References:
See also references of EP 1321697A4
Attorney, Agent or Firm:
Nagai, Fuyuki (3-2-4 Kasumigaseki Chiyoda-ku, Tokyo, JP)
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