| 摘要 |
Provided are a low-cost engine-assist device that can perform stable energy regeneration from an accumulator, and an industrial machine equipped with the engine-assist device. Directly coupled to an engine (6) are variable-capacity main pumps (7, 8), and a variable-capacity assist pump (16) having a motor function and a pump function. Return pressure fluid that has flowed out of fluid pressure actuators (3a, 9) is temporarily stored by a sub-accumulator (18) and supplied to an inlet of the assist pump (16), and the assist pump (16) provides increased pressure to main accumulators (17). A controller calculates and controls an assist pump swash plate angle by means of engine load torque, or of assist starting torque or charge starting torque set by an engine speed setting means, and the controller conducts the stored-pressure fluid discharged from the main accumulators (17) to the inlet of the assist pump (16) or conducts the increased-pressure fluid discharged from the outlet of the assist pump (16) to the main accumulators (17). |
