Hydraulic transmission device allowing energy recovery

摘要

An hydraulic transmission device (10,110) comprising an hydraulic motor (16, 18), an hydraulic pump (20), a fluid accumulator (22). The device has an accumulator-driven mode, an energy-recovery mode, a pump-driven mode. In the pump-driven mode, the pump supplies the motor with fluid drawn from an unpressurized reservoir; and in the energy-recovery mode, the motor is supplied by the pump drawing fluid from said reservoir. An assembly (1) comprising a device (10,110) as defined above, a shaft (11, 13), and a mass (12, 14) mounted eccentrically on the shaft.

主权项

1. An hydraulic transmission device, comprising:
at least one hydraulic rotary motor; the at least one hydraulic rotary motor exchanging fluid via two main ports, namely one feed port and one exhaust port; a hydraulic pump; a fluid accumulator, capable of storing and delivering fluid under pressure; the device being capable of operating:
in a pump-driven mode, in which the pump supplies fluid under pressure to the at least one hydraulic rotary motor via the feed port to drive the at least one hydraulic rotary motor in rotation, the fluid being drawn from an unpressurized reservoir;in an accumulator-driven mode, in which fluid under pressure is delivered by the accumulator at the feed port to drive the at least one hydraulic rotary motor in rotation;in an energy-recovery mode, in which the pump supplies fluid to the at least one hydraulic rotary motor via the feed port, the fluid being drawn from the unpressurized reservoir; and the at least one hydraulic rotary motor acting as a pump pumps fluid into the accumulator via the exhaust port; the device further comprising an accumulator charging valve, made with a first upstream port connected to the exhaust port and a first downstream port connected to the accumulator, and having a first (I) and a second (II) positions, which makes it possible to connect the exhaust port to the accumulator or to isolate the exhaust port from the accumulator while the feed port is connected to a delivery port of the pump.