CN211501525U

CN211501525U - Gap eliminating nut structure

Info

Publication number: CN211501525U
Application number: CN201922351092.9U
Authority: CN
Inventors: 张栋; 曾凯; 吴志敢
Original assignee: Shanghai Moons Electric Co Ltd
Current assignee: Shanghai Moons Electric Co Ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-09-15
Anticipated expiration: 2029-12-24

Abstract

The utility model relates to a clearance nut structure disappears, including first nut body (1) and second nut body (5), first nut body (1) and second nut body (5) between be equipped with the subassembly that contracts in that can provide radial contractility, first nut body (1) and second nut body (5) between still be equipped with and be used for preventing that the nut rotation prevents that favourable turn constructs (2). Compared with the prior art, the utility model discloses can effectively prolong the nut life-span, when avoiding the nut to use, because too big messenger of torque prevents advantages such as commentaries on classics mechanism fracture.

Description

Gap eliminating nut structure

Technical Field

The utility model relates to a nut structure especially relates to a clearance nut structure disappears.

Background

The screw-nut pair is used as a basic power transmission unit for linear motion, and has great use requirements in various fields. However, with the increasing precision degree, especially for the motion control system, the gap between the nut and the screw rod and the gap caused by the abrasion of the nut after a period of operation become more and more non-negligible problems.

How to design the gap-eliminating nut becomes a crucial point.

The conventional axial clearance eliminating nuts on the market are mostly in sectional type, the lead nuts are axially connected and communicated through the springs, and the springs provide axial push-pull force to enable the nuts to overcome loads so as to eliminate clearances. However, this solution can cause the spring force to fail to overcome the load when the load is high, thereby causing the backlash elimination effect to fail.

Meanwhile, the axial displacement of the multi-section nuts needs to be limited due to mutual matching of the multi-section nuts, and the phenomenon that the clearance eliminating effect is invalid due to the fact that the nuts rotate when the two sections of nuts are pushed away or pulled close is avoided.

Through search, chinese patent publication No. CN208595207U discloses an irreversible backlash-eliminating nut, which has a certain effect on irreversible backlash elimination by designing inclined surface matching, but the nut cannot bear high-load torque, and the inner shrink rings cannot be uniformly distributed in actual work, so as to provide uniform shrinkage force. Therefore, it is a technical problem to be solved how to prevent the nut from rotating and further improve the backlash eliminating effect of the nut.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a gap eliminating nut structure for overcoming the defects of the prior art.

The purpose of the utility model can be realized through the following technical scheme:

the utility model provides a clearance nut structure disappears, includes first nut body and second nut body, first nut body and second nut body between be equipped with the subassembly that contracts in that can provide radial contractility, first nut body and second nut body between still be equipped with and be used for preventing female rotation prevent changeing the mechanism, prevent changeing mechanism (2) equipartition on the nut body cross-section to for having the mechanism of positioning action, make subassembly evenly distributed contracts in.

Preferably, the anti-rotation mechanism is a nut self mechanism or an external adding mechanism.

Preferably, the nut mechanism comprises a protrusion of the first nut body and a groove of the second nut body, or a groove of the first nut body and a protrusion of the second nut body.

Preferably, the nut mechanism comprises an internal spline of the first nut body and an external spline of the second nut body which are matched with each other, or the external spline of the first nut body and the internal spline of the second nut body which are matched with each other.

Preferably, said external adding means comprises at least one rigid part.

Preferably, said rigid element is a pin.

Preferably, the rigid parts are three and evenly distributed between the first nut body and the second nut body.

Compared with the prior art, the utility model has the advantages of it is following:

1) the split type nut is cooperatively used, the rotation freedom degree of the split type nut needs to be limited, the rotation of the split type nut can be effectively limited by adding the rotation preventing mechanism, meanwhile, the high-strength rotation preventing mechanism can effectively prolong the service life of the nut, and the fracture of the rotation preventing mechanism due to overlarge torque is avoided when the nut is used.

2) The reasonable anti-rotation mechanism can also play a certain positioning role, so that the inward-shrinkage mechanism can be reasonably and uniformly distributed, the pushing force applied to the whole nut is uniform, and the nut is prevented from being asymmetrically abraded.

3) The internal shrinkage mechanism is contacted with the nut body through a specific angle, so that a self-locking function can be realized, and the phenomenon that the shrinkage force provided by the internal shrinkage mechanism is overcome when the load is overlarge, so that the gap eliminating function is invalid is prevented.

Drawings

Fig. 1 is a schematic view of an assembly structure of embodiment 1 of the present invention;

fig. 2 is an exploded schematic view of embodiment 2 of the present invention;

fig. 3 is a schematic view of an external adding mechanism in embodiment 2 of the present invention;

fig. 4 is a schematic sectional structure diagram of embodiment 2 of the present invention.

Wherein 1 is the first nut body, 2 is preventing changeing the mechanism, 3 is the first subassembly that contracts in, 4 is the second subassembly that contracts in, 5 is the second nut body, 21 is the arch, 22 is the recess.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1, a gap eliminating nut structure includes a first nut body 1 and a second nut body 5, an inward-contracting component capable of providing radial contraction force is arranged between the first nut body 1 and the second nut body 5, and an anti-rotation mechanism 2 for preventing the nut from rotating is further arranged between the first nut body 1 and the second nut body 5.

The anti-rotation mechanism 2 is a nut self-mechanism, and the nut self-mechanism comprises a protrusion 21 of the first nut body 1 and a groove 22 of the second nut body 5 which are matched with each other, or the groove of the first nut body 1 and the protrusion of the second nut body 5 which are matched with each other.

Or, in another implementation manner, the nut mechanism includes an internal spline of the first nut body 1 and an external spline of the second nut body 5, which are matched with each other, or an external spline of the first nut body 1 and an internal spline of the second nut body 5, which are matched with each other.

Example 2

As shown in fig. 2-4, a gap eliminating nut structure includes a first nut body 1 and a second nut body 5, an inward contracting component capable of providing radial contraction force is arranged between the first nut body 1 and the second nut body 5, and an anti-rotation mechanism 2 for preventing the nut from rotating is further arranged between the first nut body 1 and the second nut body 5.

The anti-rotation mechanism 2 is an external adding mechanism. The external adding mechanism comprises at least one rigid part. The rigid part can adopt a pin and other parts.

Preferably, the number of the rigid parts is three, and the rigid parts are uniformly distributed between the first nut body 1 and the second nut body 5.

The anti-rotation mechanism 2 is a mechanism with a positioning function, so that the inward-shrinkage components are uniformly distributed, the pushing-away force applied to the whole nut is uniform, and the nut is prevented from being asymmetrically abraded.

The working principle is as follows: after the nut is assembled, radial force is provided through the internal shrinkage mechanism, the two nuts are pushed away through the inclined plane at the chamfer angle, the axial displacement of the nuts is limited under the help of the anti-rotation mechanism, the nuts are prevented from rotating after the nuts are pushed away by the spring, and therefore the gap eliminating effect is achieved.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a clearance nut structure disappears, includes first nut body (1) and second nut body (5), first nut body (1) and second nut body (5) between be equipped with the subassembly that contracts in that can provide radial contractile force, its characterized in that, first nut body (1) and second nut body (5) between still be equipped with and be used for preventing the nut rotation prevent slewing mechanism (2), prevent slewing mechanism (2) equipartition on nut body cross-section to for the mechanism that has the positioning action, make subassembly evenly distributed that contracts in.

2. The gap-eliminating nut structure as claimed in claim 1, characterized in that the rotation-preventing mechanism (2) is the nut itself or an external adding mechanism.

3. A gap-eliminating nut structure according to claim 2, characterized in that the nut mechanism comprises a protrusion of the first nut body (1) and a groove of the second nut body (5) which are fitted to each other, or a groove of the first nut body (1) and a protrusion of the second nut body (5) which are fitted to each other.

4. A gap-eliminating nut structure according to claim 2, characterized in that the nut mechanism comprises mutually cooperating internal splines of the first nut body (1) and external splines of the second nut body (5), or mutually cooperating external splines of the first nut body (1) and internal splines of the second nut body (5).

5. The gap-eliminating nut structure as defined in claim 2, wherein said external adding means comprises at least one rigid member.

6. A gap nut structure as claimed in claim 5, wherein said rigid member is a pin.

7. A gap-eliminating nut structure according to claim 5, characterized in that said rigid members are provided in three numbers, evenly distributed between the first nut body (1) and the second nut body (5).