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A vehicle drive system comprises a frame, a motor, a first wheel assembly, a second wheel assembly and an endless drive member. The motor is mounted to the frame and has a motor shaft powered by the motor. The first wheel assembly includes a first axle, a first drive wheel and a first riding wheel.

A vehicle drive system comprises a frame, a motor, a first wheel assembly, a second wheel assembly and an endless drive member. The motor is mounted to the frame and has a motor shaft powered by the motor. The first wheel assembly includes a first axle, a first drive wheel and a first riding wheel. The first axle extends generally transversely from the frame and is journalled for rotation relative to the frame. A proximal end of the first axle is operatively connected to the motor shaft in a manner so that rotation of the motor shaft causes rotation of the first axle. The first axle is operatively connected to the frame in a manner so that a distal end of the first axle is moveable in a generally vertical arcuate path relative to the frame about a first pivot axis. The first drive wheel and the first riding wheel are both mounted to the first axle. Similarly, the second wheel assembly includes a second axle, a second drive wheel and a second riding wheel. The second axle extends generally transversely from the frame and generally parallel to the first axle. The second axle is journalled for rotation relative to the frame and is operatively connected to the frame in a manner so a distal end of the second axle is moveable in a generally vertical arcuate path relative to the frame about a second pivot axis. The second drive wheel and the second riding wheel are both mounted to the second axle. The endless drive member is trained around the first and second drive wheels in a manner so that rotational motion of the first drive wheel causes rotational motion of the second drive wheel.

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1. A vehicle drive system comprising:a frame; a motor mounted to the frame, the motor having a motor shaft powered by the motor; a first wheel assembly comprising: a first control arm extending generally transversely from the frame, the first control arm having a proximal end. pivotally connected to

1. A vehicle drive system comprising:a frame; a motor mounted to the frame, the motor having a motor shaft powered by the motor; a first wheel assembly comprising: a first control arm extending generally transversely from the frame, the first control arm having a proximal end. pivotally connected to the frame in a manner to permit pivoting movement of the first control arm in a generally vertical arcuate path relative to the frame; a first axle received within the first control arm for rotation relative thereto, a proximal end of the first axle being operatively connected to the motor shaft in a manner so that rotation of the motor shaft causes rotation of the first axle; a first sprocket fixedly mounted to the first axle; and a first wheel fixedly mounted to the first axle; a second wheel assembly comprising: a second control arm extending generally transversely from the frame and generally parallel to the first control arm, the second control arm having a proximal end pivotally connected to the frame in a manner to permit pivoting movement of the second control arm in a generally vertical arcuate path relative to the frame; a second axle received within the second control arm for rotation relative thereto; a second sprocket fixedly mounted to the second axle; and a second wheel fixedly mounted to the second axle; and a drive chain trained around the first and second sprockets in a manner so that rotational motion of the first sprocket causes rotational motion of the second sprocket.