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US 12,716,203 B2Granted
Construction machine
AssigneeKobelco Construction Machinery Co., Ltd.
InventorsHidenori Tanaka, Koji Ueda
Life of this patent
Estimating the term…
Abstract
A construction machine includes a relief valve that opens to limit a pressure of a pump discharge line that is a line between a main pump and a direction switching valve, a back pressure generation mechanism that is disposed on a return line that is a line connected to a tank and generates a back pressure in the return line, and an air bleed line that connects the relief valve and a portion downstream from the back pressure generation mechanism in the return line.
Claims7
A construction machine, comprising:
- a tank that stores hydraulic oil;
- a main pump that is a hydraulic pump that discharges the hydraulic oil sucked from the tank;
- a hydraulic actuator that receives supply of the hydraulic oil from the main pump to operate;
- a direction switching valve that controls supply and discharge of the hydraulic oil between the main pump and the hydraulic actuator;
- a relief valve that opens to limit a pressure of a pump discharge line that is a line between the main pump and the direction switching valve;
- a back pressure generation mechanism that is disposed on a return line as a line connected to the tank and generates a back pressure in the return line;
- and
- an air bleed line that connects the relief valve and a portion downstream from the back pressure generation mechanism on the return line, wherein
- the relief valve includes:
- a first port connected to a first line connecting the relief valve and the main pump:
- a second port connected to a second line connecting the relief valve and the tank;
- and
- an air bleed port connected to an upstream end of the air bleed line.
10 more elements
Dependencies are inferred from the claim text.