Special Cases of Friction and Applications | Zendy

Faydor L. Litvin | Zendy; J. J. Coy | Zendy

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Special Cases of Friction and Applications

Author(s) -

Faydor L. Litvin,

J. J. Coy

Publication year - 1984

Publication title -

journal of mechanisms transmissions and automation in design

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.911

H-Index - 120

eISSN - 2161-9573

pISSN - 0738-0666

DOI - 10.1115/1.3258588

Subject(s) - gimbal , kinematics , friction torque , perturbation (astronomy) , control theory (sociology) , bearing (navigation) , link (geometry) , gyroscope , torque , motion (physics) , physics , classical mechanics , mechanics , computer science , computer network , control (management) , quantum mechanics , artificial intelligence , thermodynamics , astronomy

Two techniques for reducing friction forces are presented. The techniques are applied to the generalized problem of reducing the friction between kinematic pairs which connect a moveable link to a frame. The basic principles are: (1) Let the moveable link be supported by two bearings where the relative velocities of the link with respect to each bearing are of opposite directions. Thus the resultant force (torque) of friction acting on the link due to the bearings is approximately zero. Then, additional perturbation of motion parallel to the main motion of the moveable link will require only a very small force; (2) Let the perturbation in motion be perpendicular to the main motion. Equations are developed which explain these two methods. The results are discussed in relation to friction in geared couplings, gyroscope gimbal bearings and a rotary conveyor system. Design examples are presented.

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