| 摘要 |
<p>A positive displacement hydraulic pump/motor assembly for an energy management system operable in a driving mode, a braking mode and a neutral mode to provide supplementary drive from a regenerative braking in a vehicle, includes a rotary cylinder block (3) having an axis (5) and a generally circular array of cylinders and axial pistons (10). A drive shaft (12) rotates the cylinder block (3) and a drive plate (15) effects sequential reciprocation of the pistons (10). A stationary valve plate has a valve face adapted for sliding rotational engagement with a complementary mating face formed on the cylinder block (3) and inlet/outlet ports in communication with a hydraulic source and a load. The hydraulic lift-off means, in the form of a piston (40) and cylinder (41), is selectively operable to displace the cylinder block (3) marginally away from the valve plate, thereby to minimise rotational resistance between the respective mating valve faces under predetermined operational conditions.</p> |
