Abstract: A drive system for an industrial handling vehicle comprises an electric motor, a first pump, for example, a plunger pump, and a second pump, for example, a gear pump. The first pump is configured to provide hydraulic power for a travelling device of the industrial handling vehicle. The first pump and the travelling device are in a first hydraulic circuit. The second pump is configured to provide hydraulic power for a brake device and/or a steering device and/or a handling device of the industrial handling vehicle. The second pump, the brake device, the steering device, and the handling device are in a second hydraulic circuit isolated from the first hydraulic circuit. The electric motor is operatively coupled to both the first pump and the second pump, to drive them to operate.

Abstract: A rotary apparatus includes a stationary stator having an internal cylindrical chamber. A rotor is rotatably mounted in the chamber. There are cam-like annular surfaces on the stator to each side of the rotor. A plurality of vane assemblies are slidably mounted on the rotor. The vane assemblies each have two outer ends. These slidingly engage the cam-like annular surfaces, whereby gases between the vane assemblies are compressed and expand between the cam-like surfaces and the rotor as the rotor and vanes rotate relative to the stator. Preferably each of the vane assemblies has two separate components, each outer end being on one of the components. The apparatus has a conduit for conducting compressed gases between the two components of each of the vane assemblies and thereby biasing each of the components towards one of the cam-like annular surfaces.