Abstract: In order to carry out computer-aided design for the space steering arm mechanism, to make a computer program, which can reflect the relationship between parameters and deflexion angle of the steering arm mechanism, is necessary. Firstly, the space steering arm mechanism should be reduced to the plane mechanism and the analytical design method should be researched. Then the calculation can be implemented to the transformation error and angle deviation of steering wheel. The calculation results show that the error is no more than permissible value.

Key words: mechanical design, design method of steering arm mechanism, mechanism simplification, CAD of mechanism