Patent ID: 6558040
Filing Date: 2003-05-06
Classification: F16C

Abstract:
A linear guide assembly comprising:a guide rail having three rows of ball rolling grooves on each side thereof; a slider slidably mounted on said guide rail, said slider having legs extending along both sides of the guide rail, each of the legs of the slider including three rows of ball rolling grooves respectively disposed in opposition to said three rows of said ball rolling grooves of said guide rail so as to define three rows of ball rolling passages therebetween, said slider being provided with a number of ball circulating passages containing said respective ball rolling passages; and a number of balls being put in each of said ball circulating passages; wherein said three rows of ball rolling passages are constituted by an upper, medium and lower ball rolling passages, and each balls put in one of said upper and lower ball rolling passage contacts at four points with the surfaces of said ball rolling grooves of said guide rail and said slider, while each balls put in the remaining two ball rolling passages contacts at two points with the surfaces of the ball rolling grooves of said guide rail and said slider, and wherein one of lines defined by connecting the two opposite contact points of those four contact points of said one of upper and lower ball rolling passages, and lines defined by connecting respectively the two opposite contact points of the remaining two ball rolling passages are intersected at points which are located inside or outside said guide rail, in which in said medium ball rolling passage, the ball rolling groove of said guide rail is disposed facing the ball rolling groove of said slider in a state that the center of the ball rolling groove of said slider is shifted upward a predetermined offset with respect to the center of said ball rolling groove of said guide rail, and in the lower ball rolling passage, the ball rolling groove of the guide rail is disposed facing the ball rolling groove of the slider in a state that the center of the ball rolling groove of said slider is shifted upward by a predetermined offset with respect to the center of the ball rolling groove of said guide rail.