| 摘要 |
A parallel hydromechanical continuously variable transmission has a housing that holds a make-up pump (52), and has internal cavities for holding operating assemblies of the transmission, including an axial piston pump (50) and an axial piston motor (60). The pump (50) and motor (60) each has a rotating element (not shown) and a non-rotating element (not shown). Each non-rotating pump element is mounted for tilting movement on trunnions (not shown) in its own respective pair of mounting journals in the housing. The tilting axes of the non-rotating elements lie transverse to the axes of rotation of the rotating elements. The pump (50) and the motor (60) are disposed side-by-side in the housing with the axes of rotation approximately parallel to each other. A stationary manifold (70), fixed to the housing, has one surface in contact with the rotating pump element (not shown) and a second surface in contact with the rotating motor element (not shown). Fluid passages (not shown) open in the two surfaces in fluid communication with the pump and motor cylinders (206) through a pump/manifold interface. Internal fluid passages (not shown) in the stationary manifold (70) convey fluid pressurized in the pump (50) directly to the motor (60), and convey spent fluid displaced from the motor back to the pump. The transmission ratio is controlled by the tilt angle of the non-rotating pump and motor elements. A tilt angle control apparatus (100) attached to the housing and to the non-rotating pump and motor elements governs that tilt angle.
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