Drive wheel suspension
A drive wheel and suspension for a vehicle for mounting on a steering post to provide both a steering capability and propulsion to the vehicle. The drive wheel and suspension provides a spring suspension for that wheel of the vehicle, as well as what is effectively vehicle body mounting of the propulsion system so as to minimize un-sprung weight and to provide a compact assembly to support a suitable aesthetic and protective fender over the drive wheel and suspension.
1. A drive wheel and suspension for a vehicle comprising:
a first cross member;
a pair of spaced apart, downward projecting parallel struts fastened to the first cross member;
a motor mount projecting rearward from the assembly of the first cross member, the spaced apart, downward projecting parallel struts, rearward being the direction opposite the forward motion of the vehicle on which the drive wheel and suspension is used;
a motor mounted on the motor mount for driving a motor shaft in rotation about a first axis;
a wheel coupled to and between the downward projecting parallel struts adjacent a lower end thereof for rotation about a second axis parallel to the first axis;
a first pulley on the motor shaft;
a second pulley aligned with the first pulley and disposed for rotation about a third axis parallel to the first and second axes;
a third pulley mechanically coupled to the second pulley so as to driven in rotation by the second pulley;
a fourth pulley aligned with the third pulley and mechanically coupled to the wheel to drive the wheel in rotation about the third axis;
a first belt coupling the first and second pulleys; and
a second belt coupling the third and fourth pulleys;
the foregoing parts forming a first assembly;
a second cross member above the first cross member;
the second cross member having a pair of arms projecting rearward, the second cross member and the pair of rearward projecting arms forming a second assembly;
the second assembly being coupled to the first assembly adjacent the rearward projecting ends of each of the pair of arms through bearings allowing the first and second assemblies to pivot relative to each other about a fourth axis parallel to the first through third axes, and;
at least one elastic member between the first and second cross members.
2. The drive wheel and suspension of claim 1 wherein the at least one elastic member comprises a pair of elastic members, one adjacent each end of the first and second cross members.
3. The drive wheel and suspension of claim 1 wherein the elastic member is a polymer.
4. The drive wheel and suspension of claim 1 wherein the polymer is a polyurethane.
5. The drive wheel and suspension of claim 1 wherein the elastic member is a spring.
6. The drive wheel and suspension of claim 1 wherein the pulleys and the belts are toothed pulleys and belts.
7. The drive wheel and suspension of claim 1 wherein the second cross member includes a socket for fastening to a steering post.
8. The drive wheel and suspension of claim 1 wherein the motor is mounted on the motor mount so as to be adjustable in position in a direction parallel to the first axis, whereby the first belt may be tensioned.
9. The drive wheel and suspension of claim 1 wherein the wheel is adjustable in position along the downward projecting parallel struts in a direction parallel to the second axis, whereby the second belt may be tensioned.