Patent ID: 7124660
Filing Date: 2006-10-24
Classification: A47B,B25J,G09B,Y10T

Abstract:
1. A six-degrees-of-freedom horizontal movement dynamic simulator comprising: three movement control units located separately at positions forming three sides of an equilateral triangle, each movement control unit comprises a universal-joint yoke mechanism, two connecting rods of fixed length, two transmission-joint yoke mechanisms, two sliding seats, two lead screws, two servo-driving mechanisms, a rectilinear translation guide, and two guide seats, and each movement control unity generates rectilinear translation motion and forms a symmetric structure; and a load-carrying platform pivotally connected to the three movement control units by the universal-joint yoke mechanism corresponding to each movement control unit, wherein for each movement control unit: one end of each of the two connecting rods is jointly pivoted to the universal-joint yoke mechanism to provide a spatial motion of 3 degrees of freedom relative to the load-carrying platform and the other ends of the two connecting rods are symmetrically and separately pivoted to corresponding transmission-joint yoke mechanisms to provide a spatial motion of 2 degrees of freedom, each transmission-joint yoke mechanism is pivoted to the corresponding sliding seat to enable 1 degree of freedom, the two lead screws pass through the two sliding seats and engage with the corresponding sliding seat such that the rotating angle and speed of each lead screw is controlled by the corresponding servo-driving mechanism, the two sliding seats are mounted and slide on the rectilinear translation guide such that the rectilinear translation motion of the sliding seat on the rectilinear translation guide is precisely controlled by the rotating angle and speed of the corresponding sliding seat, so as to provide a precise control of the spatial motion and linear and angular displacement of the load-carrying platform, the rectilinear translation guide comprises two straight sliding rails in parallel fixed on a guide, and each of the two guide seats has two parallel guide slots on the bottom side to match and ride on the two parallel straight sliding rails and slide along the direction of the guide rails, each servo-driving mechanism comprises a servo-motor that drives the corresponding lead screw and controls its rotating angle and speed, each sliding seat has a rectangular block shape, a pivoting recess on the top side for pivotally mounting the corresponding transmission-joint yoke mechanism, and its bottom side fastened to one of the guide seats, on the vertical surface of each sliding seat are two penetrating holes one of which has a female screw thread and engages with the corresponding lead screw and the other hole serves as the passage for the other lead screw to pass through, each transmission-joint yoke mechanism comprises an upward yoke assembly and a T-shaped pivot axis that is pivotally assembled together with the yoke assembly, two horizontal stub shafts formed on and extending from opposite sides of the T-shaped pivot axis are pivotally mounted on the two vertical portions of the upward yoke assembly, a perpendicular stub shaft extends from the center position of the yoke assembly for pivotally mounting one end of the corresponding connecting rod, a mounting shaft is extended from the bottom side of the upward yoke assembly and is pivotally mounted in the mounting recess of the corresponding sliding seat, and the universal-joint yoke mechanism comprises a downward yoke, a cardan shaft, a neck-ring seat and a cover plate, two horizontal stub shafts are formed and extend oppositely from left and right sides of the cardan shaft and are pivoted to the two vertical portions of the downward yoke, two perpendicular stub shafts are formed on and extend oppositely from the front and rear sides of the cardan shaft and are separately and pivotally connected to the connecting rod, a mounting shaft is formed on the top side of the downward yoke and pivotally mounted to the neck-ring seat, the bottom side of the cover pate is fastened to the upper side of the neck-ring seat and the top side of the cover plate is fastened to the load-carrying platform.