Travel control device for excavators

Details Travel control device for excavators Travel control device for excavators

2007-11-06

2007-11-06

Lazo, Thomas E. (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

C060S427000, C060S484000

Reexamination Certificate

active

11322276

ABSTRACT:
A travel control device enables a crawler type hydraulic excavator to start slowly regardless of the preset speed ratio whenever the manipulation amount of a manual travel control device is small. The travel control device includes left and right travel motors respectively provided with speed changing mechanisms, a high speed shifting valve provided on a high speed signal line for cutting off or transmitting a high speed signal pressure to the speed changing mechanisms, a travel signal detection means for detecting a travel control signal pressure outputted from manual travel control devices. A shutoff valve is provided on the high speed signal line for closing or opening the high speed signal line to keep the speed changing mechanisms in a low speed condition or a high speed condition depending on the magnitude of the travel control signal pressure supplied from the travel signal detection means.

REFERENCES:
patent: 4354420 (1982-10-01), Bianchetta
patent: 5085052 (1992-02-01), Kawanaka et al.
patent: 5331812 (1994-07-01), Imai
patent: 6609368 (2003-08-01), Dvorak et al.
patent: 6857494 (2005-02-01), Kobayashi et al.
patent: 2004340259 (2004-12-01), None

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