||A lobe cam reducer is an innovative reduction mechanism that can be applied as a robotic arm joint reducer with desirable rigidity. With a pure rolling contact in motion and an easy processing characteristic, the rotational speed reduction mechanism can provide a large reduction ratio with a limited space. Compared to a harmonic reducer that is limited in low-load applications, difficult to manufacturing, and with a short operating life, a lobe cam reducer can bear a higher load with a low manufacturing cost and a longer operation life.|
This study is focused on presenting a design process, including geometric and kinematic design as well as dynamic analysis for lobe cam reducers. First, the basic design parameters are identified for design selection, subsequently, the conjugate lobe cam profiles are synthesized by using rigid body transformation, and then the curvatures of the cam profiles are analyzed by differential geometry. In addition, the pressure angles of the conjugate lobe cams during operations are evaluated in this study. To characterize the rotational speeds of the lobe cams and rollers, the vector method of rigid body is used. Furthermore, the effects of design parameters on pressure angles, contact forces between the rollers of turrets and the lobe cams, contact stresses, input torque, and support reactions, etc. are observed.