Straight travelling apparatus for heavy construction equipment

Details Straight travelling apparatus for heavy construction equipment Straight travelling apparatus for heavy construction equipment

1995-06-30

1997-10-28

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60422, 60494, 91513, 91531, F16D 3102

Patent

active

056807597

ABSTRACT:
A straight travelling apparatus for heavy construction equipment, equipped with a travel supplement circuit, including a variable orifice disposed in a fluid line connected to the supply-side of the control valve of a bucket and controlled to vary an opening degree thereof by a predetermined pilot signal that is applied to the variable orifice in response to an operation of at least one of right and left travel motors in order to keep the variable orifice at a relatively closed state while being released in response to the travel motors not operating in order to keep the variable orifice in a relatively opened state, thereby capable of supplementing a sufficient amount of fluid to a travelling system when the bucket is operated during, thereby preventing an abrupt reduction in travelling speed caused by operatings the straight travelling apparatus.

REFERENCES:
patent: 3960284 (1976-06-01), Carpenter
patent: 4024710 (1977-05-01), Zelle
patent: 4030623 (1977-06-01), Bridwell et al.
patent: 4112821 (1978-09-01), Bianchetta
patent: 4210061 (1980-07-01), Bianchetta
patent: 4561824 (1985-12-01), Okabe et al.
patent: 4768339 (1988-09-01), Aoyagi et al.
patent: 5101627 (1992-04-01), Fujii et al.

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