Ball-screw spline
A ball screw nut, screw shaft technology, applied in belts/chains/gears, mechanical equipment, transmissions, etc., can solve the problems of inability to move throughout the entire length of the spline shaft and the large-scale electric actuator
Active Publication Date: 2012-02-01
THK CO LTD
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- Description
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AI Technical Summary
Problems solved by technology
That is, the above-mentioned spline nut cannot move over the entire length of the spline shaft, and it is necessary to set the entire length of the spline shaft to be longer than the stroke amount of the spline shaft.
This leads to an increase in the size of the electric actuator using the above-mentioned ball screw spline shaft
Method used
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Embodiment Construction
[0039] Hereinafter, the ball screw spline shaft of the present invention will be described in detail with reference to the drawings.
[0040] figure 1 and figure 2 is an example of a ball screw spline shaft to which the present invention is applied, figure 1 is a side view, figure 2 It is a front view.
[0041] The ball screw spline shaft 1 includes: a screw shaft 2; a ball screw nut 3 formed in a substantially cylindrical shape and screwed to the screw shaft 2 via a plurality of balls 5; and a substantially cylindrical At the same time, the spline nut 4 outside the ball screw nut 3 is assembled with a plurality of balls 6 .
[0042] The screw shaft 2 has a ball rolling groove 20 formed helically with a predetermined lead along the outer peripheral surface of the screw shaft 2 . Here, the term "lead" refers to the distance that the ball rolling groove 20 travels in the axial direction of the screw shaft 2 when the screw shaft 2 rotates once. In addition, peaks 21 are...
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Provided is a ball-screw spline (1) in which the overall length of a spline shaft can be shortened to afford a more compact structure, while the stroke amount of a spline nut is maintained at a sufficient level with respect to the overall length of the spline shaft. The ball-screw spline is provided with: a screw shaft (2); a ball-screw nut (3) which screws together with the screw shaft (2) with balls (5) interposed; and a spline nut (4) which is attached to the outside of the ball-screw nut (3) with balls (6) interposed and can move in a reciprocating manner in the axial direction of the ball-screw nut (3). The ball-screw nut (3) has a thread part (31) and an extension part (32) which are formed as a single piece and have the same diameter. Load rolling grooves (33) which combine with ball rolling grooves (20) on the side of the screw shaft (2) to form a load passage for the balls (5), and ball return passages (71) which link adjacent load rolling grooves (33) to form an infinite circuit in one turn around the screw shaft (2), are formed on the inner peripheral surface of the thread part (31). Ball rolling grooves (35) for the spline nut (4) are formed on the outer peripheral surface of the ball-screw nut (3) along the thread part (31) and the extension part (32).
Description
technical field [0001] The present invention relates to a ball screw spline shaft used for an electric actuator or the like capable of obtaining a desired stroke through the drive of an electric motor. Background technique [0002] For example, as an electric actuator using such a ball screw spline shaft, a technique disclosed in Japanese Patent Application Laid-Open No. 11-303966 is known. The ball screw spline shaft includes: a cylindrical cylinder; a spline nut disposed at one end of the cylinder; a hollow spline shaft disposed in the hollow portion of the cylinder and guided by the spline nut; and The screw shaft in the hollow part of the spline shaft. [0003] A helical helical groove for ball rolling is formed on the outer surface of the screw shaft, and the screw shaft is driven to rotate by a motor fixed at one end of the cylinder. On the other hand, one end of the spline shaft is a ball nut portion, and a helical groove opposite to the helical groove of the screw ...
Claims
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IPC IPC(8): F16H25/22F16H25/24
CPCF16H25/2223F16H2025/204Y10T74/18576Y10T74/19749
Inventor 山仓亘
Owner THK CO LTD