Walking excavator
A walking excavator ( 1 ) having a superstructure ( 2 ) and an undercarriage ( 29 ), and a cab ( 3 ) disposed on the superstructure ( 2 ), and four walking legs ( 4 ) pivotably disposed on the undercarriage ( 29 ), and an excavator arm ( 5 ) which is pivotably mounted on the superstructure ( 2 ) and to which an excavating tool ( 6 ), in particular an excavator bucket, is fastened or able to be fastened. A dual-action differential cylinder ( 7 ) pivots the excavator arm ( 5 ) up and down relative to the superstructure ( 2 ) and is articulated on the superstructure ( 2 ), on one side, and on the excavator arm ( 5 ), on an other side. For applying additional force along with the dual-action differential cylinder ( 7 ) when pivoting the excavator arm ( 5 ) down relative to the superstructure ( 2 ), a single-action differential cylinder ( 8 ) is additionally articulated on the superstructure ( 2 ), on one side, and on the excavator arm ( 5 ), on an other side.
1 . A walking excavator, comprising
a superstructure;
an undercarriage;
a cab disposed on the superstructure;
four walking legs pivotably disposed on the undercarriage;
an excavator arm pivotably mounted on the superstructure and to which an excavating tool is fastened or fastenable;
a dual-action differential cylinder for pivoting the excavator arm up and down relative to the superstructure articulated on the superstructure on one side and on the excavator arm an other side; and
a single-action differential cylinder articulated on the superstructure on one side and on the excavator arm on an other side configured to apply additional force along with the dual-action differential cylinder when pivoting the excavator arm down relative to the superstructure.
2 . The walking excavator as claimed in claim 1 , wherein the single-action differential cylinder is configured to be impinged with pressure exclusively when pivoting the excavator arm down relative to the superstructure.
3 . The walking excavator as claimed in claim 1 , wherein the dual-action differential cylinder is disposed on a lower side of the excavator arm.
4 . The walking excavator as claimed in claim 1 , wherein the single-action differential cylinder is disposed on a lower side of the excavator arm.
5 . The walking excavator as claimed in claim 1 , wherein the single-action differential cylinder is disposed on an upper side of the excavator arm.
6 . The walking excavator as claimed in claim 1 , wherein the superstructure and the undercarriage are connected to one another by a continuously rotatable connection.
7 . The walking excavator as claimed in claim 1 , wherein the single-action differential cylinder is always impinged with pressure when pivoting the excavator arm down relative to the superstructure, to apply additional force along with the double-action differential cylinder.
8 . The walking excavator as claimed in claim 1 , further comprising a regulator valve which is actuated as a function of a pressure value measured by a pressure sensor and by which the single-action differential cylinder, when pivoting the excavator arm down relative to the superstructure to apply additional force along with the double-action differential cylinder, is configured to be selectively impinged with pressure as a function of the measured pressure value.
9 . The walking excavator as claimed in claim 1 , further comprising a high pressure circuit which is actuated as a function of a pressure value measured by a pressure sensor and by which the double-action differential cylinder when pivoting the excavator arm down relative to the superstructure as a function of the measured pressure value is able to be impinged with a pressure that is increased in comparison to a normal pressure level.
10 . The walking excavator as claimed in claim 9 , wherein the high pressure circuit is also configured to impinge the single-action differential cylinder with a pressure that is increased in comparison to the normal pressure level when pivoting the excavator arm down relative to the superstructure as a function of the measured pressure value.
11 . The walking excavator as claimed in claim 9 , wherein the pressure value measured by the pressure sensor is a pressure in a pressurized line which leads to a cylinder interior of the dual-action differential cylinder that is impinged for pivoting down the excavator arm.
12 . The walking excavator as claimed in claim 1 , wherein the single-action differential cylinder is exclusively impingeable with pressure only when pivoting the excavator arm down relative to the superstructure, to apply additional force along with the double-action differential cylinder.