Patent Application
20080053260
The above object and other advantages of the present invention will become more apparent by describing in detail the preferred embodiments of the present invention with reference to the attached drawings in which:
Referring to
The fixing portion 1 is affixed to the female screws 61 of the nut 6 by screwing so as to combine with the circulation turn-off portion 2 in one piece.
The circulation turn-off portion 2 is divided into an upper member 21 and a lower member 22 which is conjoined together by tendon and mortise joint. The upper member 21 and the fixed portion 1 are integrally formed in one piece, and both upper and lower members 21 and 22 are conjoined with the side joint portion 3 by tendon and mortise joint. Two leading channels 211, 221 in connection with the female screws 61 of the nut 6 are provided for the circulation turn-off portion 2 between the upper and lower members 21 and 22. Two turn-off channels 212, 222 with a larger radius of curvature R are formed at the juncture location where the leading channels 211 and 221 are jointed to the side joint portion 3.
The independently formed side joint portion 3 is conjoined with the circulation turn-off portion 2 by tendon and mortise joint. The side joint portion 3 has an auxiliary tooth shaped slot 31 in connection with the female screws 61 of the nut 6 to mend the broken thread, and further in connection with the turn-off channels 212, 222 branched out of the circulation turn-off portion 2 so as to form a side turn-off channel 32 with a larger radius of curvature for circulation, the other terminal of the side turn-off channels 32 is connected to an axial path 62 of the nut 6 thereby forming a complete rolling circulation passage.
With such a dexterously designed circulation turn-off portion 2 and the side joint portion 3, by way of the turn-off channels 212, 222 of the circulation turn-off portion 2 to connect with the side turn-off channel 32 of the side joint portion 3, the turning curvature R of the circulation passage is enlarged thereby allowing the rolling balls to travel more smoothly in the circulation passage and improve actual mechanical effect of the ball screw unit.
Referring again to
Style 1: As shown in
Style 2: As shown in
With all above-mentioned styles, the leading channels 211 and 221, the turn-off channels 212 and 222, and the side turn-off channel 32 are provided between the circulation turn-off portion 2 and the side joint portion 3 so as to form a circulation passage allowing the rolling balls to travel smoothly and efficiently. The kernel of the structure of the circulation member provided by the present invention lies in the layout of the turn-off channels 212 and 222 with the side turn-off channel 32 extended from there so as to allow the circulation member 10 to have a larger radius of curvature R for circulation passage that facilitates the movement of the rolling balls. At the same time, an auxiliary tooth shaped slot 31 provided aft of the side turn-off channel 32 of the side joint portion 3 serves to form a perfect and smooth circulation rolling passage between the circulation member and the nut thereby practically improving the mechanical effect of the ball screw unit.
Meanwhile, as shown in
Furthermore, as shown in
In brief, notwithstanding which style it belongs to (refer to
While the invention has been described in terms of what are presently considered to be the most practical and preferred embodiments, it is to be understood that the invention need not be limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications similar arrangement included within the spirit and scope of the appended claims, which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.
