Change-Speed Control System for Utility Vehicle Having Stepless Change-Speed Apparatus for Speed-Changing Engine Output and Transmitting the Speed-Changed Output to Traveling Unit

A work vehicle comprising:

• a pair of steerable front wheels and a pair of rear wheels;
• a frame supported by the front and rear wheels;
• an engine supported by the frame and generating power to drive at least the rear wheels, a forward end of the engine being located in a middle region between a first line that passes through each shaft of the pair of front wheels and a second line that passes through each shaft of the pair of rear wheels, when the front and rear wheels are oriented straight forward, or closer to the second line than to the first line, wherein a crank shaft of the engine extends in a longitudinal direction of the work vehicle;
• a gear transmission that defines a part of a drive train for transmitting power from the engine to at least the rear wheels;
• transmission case that houses at least the gear transmission, the transmission case being connected to the engine such that the engine and the case forms an integral unit.

A work vehicle comprising:

• a pair of steerable front wheels and a pair of rear wheels;
• a frame supported by the front and rear wheels;
• an engine supported by the frame and generating power to drive at least the rear wheels;
• a gear transmission that defines a part of a drive train for transmitting power from the engine to at least the rear wheels;
• rear wheel differential mechanism located in the drive train, between the gear transmission and the rear wheels;
• a first output shaft extending from one side of the rear wheel differential mechanism;
• a second output shaft extending from a side opposite from the one side of the rear wheel differential mechanism;
• a first rotational shaft connected to one of the pair of rear wheels;
• a second rotational shaft connected to another of the pair of rear wheels;
• a first joint located between and articulately joining the first output shaft and the first rotational shaft;
• a second joint located between and articulately joining the second output shaft and the second rotational shaft.

A work vehicle comprising:

• a first and second steerable front wheels;
• a first and second rear wheels;
• a frame supported by the front and rear wheels;
• an engine supported by the frame and generating power to drive at least the rear wheels;
• a gear transmission that defines a part of a drive train for transmitting power from the engine to at least the rear wheels;
• a rear wheel differential mechanism located in the drive train, between the gear transmission and the rear wheels;
• a transmission case that houses the gear transmission and the rear wheel differential mechanism;
• a first output shaft extending from a side of the differential mechanism facing the first rear wheel;
• a second output shaft extending from a side of the differential mechanism facing the second rear wheel;
• a first multi-plate type brake for braking a rotational movement the first rear wheel, the first multi-plate type brake connected with the first output shaft and provided to the transmission case;
• a second multi-plate type brake for braking a rotational movement the second rear wheel, the second multi-plate type brake connected with the second output shaft and provided to the transmission case;
• a third multi-plate type brake for braking a rotational movement the first front wheel;
• a forth multi-plate type brake for braking a rotational movement the second front wheel.

A work vehicle comprising:

• a pair of steerable front wheels and a pair of rear wheels;
• a frame supported by the front and rear wheels;
• an engine supported by the frame and generating power to drive at least the rear wheels;
• a gear transmission that defines a part of a drive train for transmitting power from the engine to at least the rear wheels;
• a rear wheel differential mechanism located in the drive train, between the gear transmission and the rear wheels;
• a first output shaft extending from one side of the rear wheel differential mechanism;
• a second output shaft extending from a side opposite from the one side of the rear wheel differential mechanism;
• a hydrostatic change speed apparatus that transmits power from the engine to the gear transmission, the hydrostatic change speed apparatus being located rearwardly of the first and second output shafts.