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An axle driving apparatus comprises a housing. The housing contains a hydrostatic transmission, a differential unit driven by the hydrostatic transmission, a pair of axles mutually differentially connected through the differential unit, and a restricting mechanism for selectively restricting differe

An axle driving apparatus comprises a housing. The housing contains a hydrostatic transmission, a differential unit driven by the hydrostatic transmission, a pair of axles mutually differentially connected through the differential unit, and a restricting mechanism for selectively restricting differential motion of the axles by manual operation. The differential unit comprises a ring gear serving as an input gear and a pair of bevel gears which can be differentially rotated by rotation of the ring gear. The restricting mechanism engages one of the bevel gears with the ring gear. If a pair of differential side gears fixed on the respective axles serve as the bevel gears, the restricting mechanism engages one of the bevel gear to the ring gear through a claw clutch or a friction clutch.

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What is claimed is: 1. An axle driving apparatus comprising: an axle; a housing supporting the axle, the housing including two divisional housing members joined to each other through a joint surface extended perpendicular to the axle; a center section separably installed to a place in the housing,

What is claimed is: 1. An axle driving apparatus comprising: an axle; a housing supporting the axle, the housing including two divisional housing members joined to each other through a joint surface extended perpendicular to the axle; a center section separably installed to a place in the housing, the center section being provided thereon with a pump mounting surface and a motor mounting surface, ports being opened at the respective pump and motor mounting surfaces, wherein the pump mounting surface and the motor mounting surface are disposed perpendicular to each other, and wherein, when the center section is installed to the place in the housing, the pump mounting surface is closer to the axle than the motor mounting surface, and a plane including the motor mounting surface intersects the pump mounting surface; a hydraulic pump disposed in the housing and mounted on the pump mounting surface; a pump shaft of the hydraulic pump, wherein the pump shaft is extended perpendicular to the axle and outward from one of the divisional housing members; a movable swash plate of the hydraulic pump; a pair of coaxial trunnion shafts projecting from opposite surfaces of the movable swash plate, wherein the trunnion shafts are extended parallel to the axle, wherein the divisional housing members support the respective trunnion shafts, and wherein one of the trunnion shafts projects outward from the corresponding divisional housing member; a motor shaft extended parallel to the axle; a hydraulic motor disposed in the housing and mounted on the motor shaft, wherein the hydraulic pump and motor mounted on the respective pump and motor mounting surfaces are fluidly connected to each other through the ports in the center section; and a gear train disposed in the housing so as to drivingly connect the motor shaft to the axle. 2. The axle driving apparatus according to claim 1, wherein the plane including the motor mounting surface passes a space between the trunnion shafts. 3. The axle driving apparatus according to claim 1, wherein the plane including the motor mounting surface intersects the pump shaft. 4. The axle driving apparatus according to claim 1, wherein a plane including the pump mounting surface intersects the motor mounting surface.