Ball-screw spline
A technology for ball screw nuts and screw shafts, which is applied to belts/chains/gears, mechanical equipment, transmissions, etc., and can solve problems such as inability to move throughout the entire length of the spline shaft and large-scale electric actuators
Active Publication Date: 2014-08-20
THK CO LTD
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- Abstract
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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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The present invention provides a ball screw spline shaft (1) that can ensure a sufficient stroke amount of a spline nut relative to the entire length of the spline shaft and at the same time shorten the overall length of the spline shaft and achieve downsizing. The ball screw spline shaft has: a screw shaft (2); a ball screw nut (3) screwed to the screw shaft (2) through balls (5); and a ball screw nut (3) assembled on the ball screw through balls (6). A spline nut (4) is assembled outside the nut (3) and can reciprocate freely in the axial direction of the ball screw nut (3). The ball screw nut (3) has a threaded portion formed integrally with the same outer diameter. (31) and the extension part (32). The inner peripheral surface of the threaded part (31) is formed with a load rolling groove that is combined with the ball rolling groove (20) on the screw shaft (2) side to form a load channel for the ball (5). groove (33); and a ball return channel (71) that connects adjacent load rolling grooves (33) to form an infinite circulation path around the above-mentioned screw shaft (2). Between the above-mentioned ball screw nut (3) A ball rolling groove (35) for the spline nut (4) is formed on the outer peripheral surface throughout the threaded portion (31) and the extended portion (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
CPCF16H2025/204F16H25/2223Y10T74/18576Y10T74/19749
Inventor 山仓亘
Owner THK CO LTD