Vehicle drive system for a self-propelled trailer

1. A vehicle drive system:

a hub assembly having a wheel hub upon which a wheel assembly is secured;

a drive assembly configured to selectively transmit a motive force to cause the hub to turn, the drive assembly includes:

a motor with a rotatable motor output shaft;

a transmission assembly connected to the motor and receiving in the rotatable motor output shaft into an input opening therein;

a driveshaft extending through the wheel hub upon which the wheel is to be mounted and connected to an output from the transmission assembly; and

a clutch assembly connected to the hub assembly and engageable to the driveshaft, the clutch assembly having:

a first end that mechanically engages with a transmission output and an opposite second end that is keyed so as to be mechanically engaged with a first driving clutch element of the clutch assembly, and

a second driven clutch element secured to the wheel hub with a spacer positioned there between,

wherein the driveshaft laterally slides towards and away from the transmission output while remaining mechanically engaged with the transmission output that is keyed to correspond with the driveshaft in order to accept and positively engage the driveshaft.

2. The vehicle drive system of claim 1 , wherein the first driven clutch element slidably engages with the second driven clutch element.

3. The vehicle drive system of claim 2 , further comprising a locking mechanism for selectively engaging the first driven clutch element and the second driven clutch element.

4. The vehicle drive system of claim 3 , wherein the locking mechanism urges a lateral movement of the driveshaft towards and away from the transmission output and engaging and disengaging the first driven clutch element and the second driven clutch element.

5. The vehicle drive system of claim 3 , wherein the locking mechanism includes:

a pushing member having a detent and configured to reciprocate between a first position and second position;

a pushing member receptacle configured to receive the pushing member;

an urging member secured at one end by a pivot pin, and having a roller capable of at least partially residing within the detent while in the second position, the roller secured to the urging member;

the urging member being normally biased in a first direction, and moved in a second direction by the pushing member, such that the roller resides at least partially within the detent, while the urging member is pushed in the second direction, the urging member having a free end configured to urge a lateral movement of a driveshaft to disengage the clutch assembly, while the urging member is moved in a second direction.

6. The vehicle drive system of claim 5 , wherein pushing member is hydraulically actuated.

7. The vehicle drive system of claim 1 , wherein the motor is a hydraulic motor.

8. A vehicle drive system:

a hub assembly having a wheel hub upon which a wheel assembly is secured;

a drive assembly configured to selectively transmit a motive force to cause the hub to turn, the drive assembly includes:

a motor with a rotatable motor output shaft;

a transmission assembly connected to the motor and receiving in the rotatable motor output shaft into an input opening therein;

a driveshaft connected to an output from the transmission assembly;

a clutch assembly connected to the hub assembly and engageable to the driveshaft, a pushing member having a detent and configured to reciprocate between a first position and second position;

a pushing member receptacle configured to receive the pushing member;

an urging member secured at one end by a pivot pin, and having a roller capable of at least partially residing within the detent while in the second position, the roller secured to the urging member;

wherein the urging member being normally biased in a first direction, and moved in a second direction by the pushing member, such that the roller resides at least partially within the detent, while the urging member is pushed in the second direction, the urging member having a free end configured to urge a lateral movement of a driveshaft to disengage the clutch assembly, while the urging member is moved in a second direction.

9. The vehicle drive system of claim 5 , wherein pushing member is hydraulically actuated.