Motion platform system

摘要

A motion platform system comprising a motion platform which is supported above a base by displacement units. Displacement units comprise a drive unit which drives a crank. A connecting arm is connected between the crank and the motion platform, so that translational and tilting movement of the motion platform is achieved by appropriate operation of the drive units. Each connecting arm has a curved profile which enables a full range of movement of the motion platform to be achieved using connecting arms of relatively short length. The connection between the connecting arm and the crank arm can be brought close to, or within, the crank arm. The height of the motion platform above the base, and bearing loads within the drive units, can thus be reduced.

主权项

1. A motion platform system comprising a motion platform which is supported on a base by a displacement mechanism comprising a plurality of displacement units, each displacement unit comprising a drive unit having a rotational output member, a crank arm driveable by the output member, and a connecting arm connected to the crank arm and to the platform by first and second connection means at respective ends of the connecting arm, the first connection means comprising a 3-axis bearing situated at a position away from the axis of the output member, the connecting arm having a configuration such that a portion of the connecting arm is offset laterally from a straight line extending between the first and second connection means in which the 3-axis bearing comprises a spherical bearing element which is pivotable within a complementary spherical surface and in which the spherical bearing element is carried by a lateral extension of the connecting arm and the spherical surface is provided within the crank arm.