| 摘要 |
Swing kinetic and boom potential energy may be recovered in a machine (10) having a movable work tool (16), a swing motor (49) for rotating the work tool (16), a hydraulic cylinder (28) for raising and lowering the work tool (16), a pump (58, 180) selectively connected to the swing motor (49) and the hydraulic cylinder (28), and a power source (88) outputting power to drive the pump (58, 180). The machine (10) may further include a first accumulator (118), a swing charge valve (128) having a charge set pressure, and a boom charge valve (186). The swing charge valve (128) selectively fluidly connects the swing motor (49) to the first accumulator (118), and opens to fluidly connect the swing motor (49) to the first accumulator (118) when a swing motor fluid pressure is greater than a charge set pressure of the swing charge valve (128). The boom charge valve (186) may selectively fluidly connect a head-end chamber (158) of the hydraulic cylinder (28) to the first accumulator (118) when the work tool (16) is lowered. |
