Innovativt Drivpaket för Rullstol
Power AssistedWheelchairKraftassisteradMaskiningenjörRullstolMaskinteknikHandikapphjälpmedelNyskapandeInnovativtHastighetsåterkopplingTorque sensor freeKandidatuppsatsExamensarbeteHalmstad
This is a thesis for a Bachelor Degree Project, performed in the subject MechanicalEngineering. The students Roger Malmberg and Simon Hagberg have carried out adesign project on behalf of the recently established company J&D Assisting systems,located in Halmstad.The project consisted in developing J&D's first prototype of a power assisting solutionfor wheelchairs. A power assisted wheelchair combines human power, which is deliveredby the arms through the pushrims, with electrical motors, which are powered by a battery.The power assisted wheelchair is aimed at customers, who have used a regularwheelchair for a long time, but who have become weaker or just need additional powerwhen driving uphill. This kind of wheelchair will provide additional power for users,which will spare their wrists, elbow and shoulders. The product is torque sensor free andinstead it relies on the velocity. Engines and gearboxes from the company All motion wasa requirement. The construction could not impair the wheelchair's trafficability and theperformance would at least match up with the performance of the first prototype. To builda working prototype was a part of the task. The work was early focused on the specificwheelchair Etac Next. At the same time, the result should be, as much as possible,suitable for the most common wheelchairs.The result is a design where the engine packet is assembled in a 90° angle towards thewheelaxle. In the angle, the power is transferred by bevel gears, assembled on shaftssupported by ball bearings. Then, the force is transmitted via a modified wheel axle to astructure mounted outside the hub. Eight stokes transfers the force to the hand rims.An operational prototype has been built and then been assembled on the wheelchair EtacNext. The part mounted outside of the wheel has got a plastic hood to cover up and toprotect the inner parts. The plastic hood has been produced with SLS technology.