The kinematics design of a new mobile robot suspension for unstructured environments is presented in this paper. This design incorporates an adaptable-passive mechanism that compensates for irregularities of terrain. The new mechanism comprises two pairs of bogies joined by a crank-slider mechanism. The kinematic analysis and numerical simulations of the robot have been carried out and are presented. Two performance indexes based on the tilt angle of the payload platform and velocity of the front wheel are proposed and used as a mean of performance evaluation. From a comparative analysis of reported mobile robots in the specialized literature several advantages of the new system are identified. Moreover the results have shown that the system is able to overcome most types of obstacles with a minimum variation of the tilt angle of the payload platform.

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