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Title:
SLOW-SPEED TRAVELING CONTROLLER FOR WORK VEHICLE
Document Type and Number:
Japanese Patent JP2003083447
Kind Code:
A
Abstract:

To perform slow-speed traveling control to a work vehicle in a state of large work ability wherein an engine speed is increased.

The work vehicle has a charging pump 5, a working hydraulic pump 4 and a traveling hydraulic pump 3 driven by an engine 2; a hydraulic motor 6 for driving a traveling device, closed-circuit-connected to the traveling hydraulic pump 2; and a pilot valve 8 controlling a discharge oil amount of the traveling hydraulic pump 3. In the work vehicle, an orifice 15 generating differential pressure according to a flow rate is provided halfway along a control circuit 14 connected to the pilot valve 8 from the charging pump 5, pilot conduits 16, 17 are connected to the pilot valve 8 from the primary side and the secondary side of the orifice 15, the secondary side of the orifice 15 is connected to a low-pressure leaf valve 19, and the primary side of the orifice 15 is connected to the suction side of the charging pump 5 through a needle valve 21 whose opening can be finely adjusted.


Inventors:
SAITO SHIN
MORITA SHIGERU
Application Number:
JP2001275510A
Publication Date:
March 19, 2003
Filing Date:
September 11, 2001
Export Citation:
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Assignee:
HITACHI FURUKAWA KENKI KK
International Classes:
B60W10/04; B60W10/06; B60W10/10; B60W10/101; B60W10/103; F02D29/00; F16H39/04; F16H61/40; F16H61/4052; (IPC1-7): F16H61/40; B60K41/00; B60K41/12; F02D29/00; F16H39/04
Domestic Patent References:
JPH11257489A1999-09-21
JPH0650955U1994-07-12
JPS5345391U1978-04-18
JPH051768A1993-01-08
Attorney, Agent or Firm:
Tetsuya Mori (3 others)