Patent ID: 7152403

Claim:
A power unit for vehicle, comprising: an engine having a crank shaft mechanical unit aligned transverse to the vehicle; a static hydraulic continuously variable transmission including a rotary mechanical unit aligned parallel to the crank shaft mechanical unit; a main housing such that the crank shaft mechanical unit of the engine and the rotary mechanical unit of the static hydraulic continuously variable transmission are positioned in the main housing; a gear train engaged with said static hydraulic continuously variable transmission; a drive shaft aligned longitudinal to the vehicle; drive and driven bevel gears engaged with one another and said gear train and said drive shaft, respectively, to change direction of rotational energy from transverse to longitudinal; a cylinder casing including a piston mechanical unit of the engine, the cylinder casing being coupled to the main housing at a root of the cylinder casing; and a swash plate actuator providing swash plate angle control of at least one of a hydraulic pump and a hydraulic motor, the swash plate actuator being attached to the main housing and positioned adjacent to the root of the cylinder casing relative to the main housing, wherein the swash type hydraulic pump and the hydraulic motor are coupled by a hydraulic pressure closing circuit to extract an output rotation of the hydraulic motor by changing a speed of input rotation of the hydraulic pump through a rotating drive of the hydraulic pump with the engine and the swash plate angle control of at least one of the hydraulic pump and hydraulic motor.