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Double-nut ball screw pair

A technology of ball screw pair and double nuts, which is applied in the direction of transmission parts, belts/chains/gears, mechanical equipment, etc., to achieve the effect of convenient pre-tightening force

Pending Publication Date: 2020-05-22
CHANGZHOU INST OF MECHATRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a double-nut ball screw pair to solve the technical problem of preloading and eliminating the axial gap existing after the wear of the lead screw, main nut and auxiliary nut of the double-nut ball screw pair

Method used

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  • Double-nut ball screw pair
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  • Double-nut ball screw pair

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] figure 1 , figure 2The basic structure of the present invention is shown, a double-nut ball screw pair, including a lead screw 1 , a main nut 2 , an auxiliary nut 3 , a force-bearing key 12 , a pre-tightening plate 4 , and a pre-tightening hoop 5 . The screw 1 is provided with a main nut 2 and an auxiliary nut 3 in series, and the end surface of the main nut 2 facing the auxiliary nut 3 is in close contact with the end surface of the auxiliary nut 3 facing the main nut 2, and the main nut 2 and the auxiliary nut 3 Can be rotated relatively.

[0041] see image 3 , Figure 4 The outer peripheral surface of the main nut 2 facing the side of the auxiliary nut 3 is a cylindrical surface coaxial with the axis of the main nut 2 (the axis of the main nut 2 described here refers to: the part on the main nut 2 passed by the screw 1 The axis of the hole. The same below), the outer peripheral surface of the main nut 2 is provided with a keyway 2-1 along the axis direction of ...

Embodiment 2

[0056] On the basis of the double-nut ball screw pair in Embodiment 1, the double-nut ball screw pair provided in this embodiment has roughly the same structure as the double-nut ball screw pair in Embodiment 1, except that the double-nut ball screw pair in this embodiment The lead screw pair is provided with a rib 5-4 at the position where the pre-tightening hoop 5 contacts the pre-tightening sheet 4 (see Figure 7 ), so that the section of the pre-tightening hoop 5 in this part is The groove shape. The beneficial effect of the improvement is: let the arched back 4-1 of the pre-tightening piece 4 be embedded in the shape of the pre-tightening hoop 5 In the shaped groove, the pre-tightening piece 4 gives the pre-tightening hoop 5 the axial positioning of the screw 1, so as to prevent the pre-tightening hoop 5 from shifting along the axial direction of the screw 1 and disengaging from the pre-tensioning piece 4. The axial positioning of the pretensioning sheet 4 relative to ...

Embodiment 3

[0059] For the double-nut ball screw pair of embodiment 1 or embodiment 2, the arcuate integral pretensioner 4 has a simple structure, but has disadvantages: the centripetal pressure of the pretensioner 5 on the pretensioner 4, Part of the centripetal pressure is used to overcome the elastic force of the pre-tightening sheet 4 to make it straight, and the remaining centripetal pressure is used to push the main nut 2 and the auxiliary nut 3 to rotate in opposite directions around the screw 1, namely Only part of the centripetal pressure of the pre-tightening hoop 5 on the pre-tightening sheet 4 is used to push the main nut 2 and the auxiliary nut 3 to rotate in opposite directions around the lead screw 1 respectively.

[0060] see Figure 8 , Figure 9 , in order to improve the utilization rate of the centripetal pressure that the pre-tightening hoop 5 presses on the pre-tightening sheet 4, the pre-tightening sheet 4 of the double-nut ball screw pair provided in this embodimen...

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Abstract

The invention provides a double-nut ball screw pair which comprises a screw rod, and a mother nut and an assistant nut sleeving the screw rod in a series connection way. A key groove is formed in theperipheral face of one side, facing the assistant nut, of the mother nut and is formed along the axial direction of the mother nut; a force bearing key is inlaid in the key groove; a sleeve integratedwith the assistant nut is arranged on one side, facing the mother nut, of the assistant nut; the sleeve is provided with a circular hole coaxial to the assistant nut; an arc-shaped hole is formed inthe sleeve; the sleeve sleeves the end part, facing the assistant nut, of the mother nut; the part, protruded out of the key groove and far away from the screw rod, of the force bearing key is embedded into the arc-shaped hole; the force bearing key is suitable to be moved in the arc-shaped hole along the circumferential direction of the sleeve; a pre-tightening piece is further embedded in the arc-shaped hole; and an annular pre-tightening hoop surrounds the periphery of the sleeve and presses against the pre-tightening piece. According to the double-nut ball screw pair provided by the invention, an axial clearance newly produced by the wear of the screw rod, the mother nut and the assistant nut of the double-nut ball screw pair can be eliminated, and a pre-tightening force of the mothernut and the assistant nut abutted against each other is conveniently adjusted.

Description

technical field [0001] The invention relates to the technical field of ball screw nut pair transmission, in particular to a double nut ball screw pair. Background technique [0002] At present, the precise ball screw nut pair transmission requires not only a certain unidirectional feeding accuracy, but also strictly controls the axial clearance between the nut and the screw, otherwise, when the screw rotates in the opposite direction, there will be voids. return error. In order to eliminate the backlash error caused by the axial clearance between the nut and the screw, the ball screw nut pair generally uses double nuts to preload and eliminate the backlash. The invention patent with the patent number ZL201610943955.X discloses a double-nut pre-tightening ball screw pair. The main nut and the auxiliary nut are covered with a main groove at the end of the main nut facing the auxiliary nut, and an auxiliary groove is arranged at the end of the auxiliary nut facing the main nu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H25/22F16H57/12
CPCF16H25/2209F16H25/2204
Inventor 庞雨花高志坚
Owner CHANGZHOU INST OF MECHATRONIC TECH