US 12,312,773 B2
Excavator
Riichi Nishikawara, Chiba (JP)
Assigned to SUMITOMO CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
Filed by SUMITOMO CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
Filed on Apr. 11, 2024, as Appl. No. 18/632,668.
Application 18/632,668 is a continuation of application No. PCT/JP2022/040243, filed on Oct. 27, 2022.
Claims priority of application No. 2021-178370 (JP), filed on Oct. 29, 2021.
Prior Publication US 2024/0254729 A1, Aug. 1, 2024
Int. Cl. E02F 9/22 (2006.01)
CPC E02F 9/2292 (2013.01) [E02F 9/2282 (2013.01); E02F 9/2285 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An excavator, comprising:
a lower travelling body;
an upper rotating body mounted rotatably on the lower travelling body;
an attachment attached to the upper rotating body and including a boom, an arm, and a bucket;
a first hydraulic pump and a second hydraulic pump that are mounted on the upper rotating body;
a confluence valve that merges an operating oil discharged from the first hydraulic pump and the operating oil discharged from the second hydraulic pump with each other; and
a control device that can control functioning of the confluence valve,
wherein the confluence valve is a straight-travel valve, and
the control device moves the straight-travel valve to merge the operating oil discharged from the first hydraulic pump and the operating oil discharged from the second hydraulic pump with each other in a case where a discharging pressure of the first hydraulic pump is higher than a discharging pressure of the second hydraulic pump while at least three selected from the upper rotating body, the boom, the arm, and the bucket are moving simultaneously in a non-travelling state.