CN109944933A - The double nut elastic gap-eliminating of screw pair pre-tightens - Google Patents
The double nut elastic gap-eliminating of screw pair pre-tightens Download PDFInfo
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- CN109944933A CN109944933A CN201910335683.9A CN201910335683A CN109944933A CN 109944933 A CN109944933 A CN 109944933A CN 201910335683 A CN201910335683 A CN 201910335683A CN 109944933 A CN109944933 A CN 109944933A
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- nut
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- outer round
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- interior square
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- 230000036316 preload Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 230000003447 ipsilateral effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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Abstract
A kind of double nut elastic gap-eliminating of screw pair pre-tightens, and proposes a kind of dedicated unit and its pre-tension method, including lead screw 1, interior square nut 2, diaphragm spring 3, several pre-loading screws 4, outer round nut 5 and pressure sensor 6；It is adjustment component with diaphragm spring 3, interior square nut 2 is intermediate transmission component, diaphragm spring 3 is pre-tightened by tightening multiple pre-loading screws 4, make the identical internal screw thread of two parameters of the internal thread through hole 2-3 of interior square nut 2 and the screwed hole of centre 5-1 of outer round nut 5 respectively, real-time monitoring is carried out to pretightning force with pressure sensor 6, respectively from lead screw 1 different sections it is externally threaded not ipsilateral inconsistent, it can be achieved that screw pair in transmission process because abrasion generate axial gap.The present apparatus provides the adjusting method that two kinds of different nuts pre-tighten, and has many advantages, such as that compact-sized, easy to operate, the service life is long, and its manufacture is easy, is at low cost, and market application prospect is wide.
Description
Technical field
The invention belongs to technical field of mechanical transmission, the double nut elastic gap-eliminating for being related to a kind of screw pair is pre-tightened.
Background technique
Feed screw nut has structure letter as the worm drive element that can commonly convert rotational motion into linear motion
The advantages of list, reliable transmission.Generally, due to processing and abrasion in actual use, lead screw external screw thread in screw pair
There are return gaps between nut inner thread, and with the increase of abrasion loss, and this gap is in the trend increased, therefore the gap that disappears
Device becomes one of the structure of screw pair indispensability.
The similar nut of two structures backwards to installing, is adjusted two nuts by bolt by existing double nut anti-backlash mechanism
Axial gap, achieve the purpose that screw pair disappears gap.This gap method that the disappears advantage simple, easy to adjust with structure,
It is not high but there is also precision, adjust troublesome defect.It is adjusted, is realized double by pretension bolt between common double nut
The nut effect with the externally threaded Two-way side face contact of lead screw respectively.Gap with the abrasion of screw thread, between lead screw and nut
It will increase, need periodically to manually adjust the pretension bolt between double nut.In addition, the tune of the pretension bolt between double nut
Whole dynamics determines that the gap effect that disappears of double nut, the pretightning force of pretension bolt increase, then the gap of screw pair becomes smaller, the two
Between wear aggravation, service life reduction；Conversely, the pretightning force of adjustment bolt reduces, then the gap of screw pair becomes larger, and influences silk
The transmission accuracy of thick stick pair of nut.
Therefore, in order to realize the automatic compensation in gap between the external screw thread of lead screw and the internal screw thread of nut in screw pair
And adjust automatically, the double nut elastic gap-eliminating for proposing a kind of screw pair pre-tightens, in such a way that inside and outside nut is nested,
And in the mode of two axially increased diaphragm springs of nut, automatic compensation of the nut because wearing the axial gap generated is realized, this
Device has many advantages, such as compact-sized, easy to install, durable, and precision is higher.
Summary of the invention
The following technical solution is taken in a kind of double nut elastic gap-eliminating preload of screw pair:
Including lead screw 1, interior square nut 2, diaphragm spring 3, several pre-loading screws 4, outer round nut 5 and pressure sensor 6；Outer circle
Nut 5 is cylindrical body, and there is a rectangular blind hole in one end of cylindrical body, and the other end has a screwed hole of centre through-hole and several are uniformly distributed small
Tapped through hole；Pressure sensor 6 and interior square nut 2 are sequentially arranged in the rectangular blind hole of outer round nut 5；Several pre-loading screws
4 are mounted in minor thread through-hole, and the front end of pre-loading screw 4 heads on the side of pressure sensor 6；The center hole of diaphragm spring 3
Empty set is on the outside of the cylinder boss of interior square nut 2, and the outside finger pressure of diaphragm spring 3 is in the other side of pressure sensor 6；Lead screw 1
Across the screwed hole of centre of outer round nut 5 and interior square nut 2, outer round nut 5 and interior square nut 2 are cascaded；Lead screw 1
The thread form angle of the internal thread through hole 2-3 of the screwed hole of centre 5-1 and interior square nut 2 of external thread parameter and outer round nut 5, rotation direction,
Lead is consistent.
Outer round nut 5 is by screwed hole of centre 5-1, rectangular blind hole 5-2, several threaded holes 5-3 and exterior circular column 5-4 group
At；The axis of exterior circular column 5-4 is overlapped with three line of center line of the axis of screwed hole of centre 5-1 and rectangular blind hole 5-2；Several
Threaded hole 5-3 is radially uniformly distributed centered on the axis of screwed hole of centre 5-1.
Interior square nut 2 is a structure of the square 2-1 with cylinder boss 2-2, has internal thread through hole 2-3 perforation along center
Square 2-1 and cylinder boss 2-2, the center of square 2-1 are overlapped with the axis of cylinder boss 2-2；The end of square 2-1
Face size is consistent with the face size of rectangular blind hole 5-2 of outer round nut 5, the square 2-1 of interior square nut 2 and outer round nut 5
Rectangular blind hole 5-2 between keep clearance fit.
There are a circular hole in the generally dish-shaped intermediate projections structure of diaphragm spring 3, centre, and outside is radial finger-type；
The outer rim of radial finger-type of diaphragm spring 3 is in the same disc.
The beneficial effects of the present invention are:
It by the way of combination nut, is divided into several widgets to form an integral nut, is adjustment with diaphragm spring 3
Component, interior square nut 2 are intermediate transmission component, pre-tighten diaphragm spring 3 by tightening pre-loading screw 4, use pressure sensing
Device 6 carries out real-time monitoring to pretightning force, and the screw thread on interior square nut 2 and outer round nut 5 is made to contradict the two sides spiral shell of lead screw 1 respectively
Line is, it can be achieved that eliminate the axial gap that pair of nut is generated by abrasion；Its is compact-sized, easy to operate, the service life is long, and its manufacture letter
It is single, at low cost, it has a good application prospect.
Detailed description of the invention
Fig. 1 is structure chart of the invention.
Fig. 2 is outer nut structure chart of the invention.
Fig. 3 is interior square nut structure chart of the invention.
Fig. 4 is diaphragm spring structure chart of the invention.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawing.
Such as Fig. 1, a kind of double nut elastic gap-eliminating preload of screw pair, including lead screw 1, interior square nut 2, diaphragm spring
3, several pre-loading screws 4, outer round nut 5 and pressure sensor 6；Outer round nut 5 is cylindrical body, and one end of cylindrical body has rectangular
Blind hole, the other end have a screwed hole of centre through-hole and several uniformly distributed minor thread through-holes；Pressure sensor 6 and interior square nut 2
It is sequentially arranged in the rectangular blind hole of outer round nut 5；Several pre-loading screws 4 are mounted in minor thread through-hole, pre-loading screw 4
Front end heads on the side of pressure sensor 6；The center hole empty set of diaphragm spring 3 is on the outside of the cylinder boss of interior square nut 2, film
The outside finger pressure of flat spring 3 is in the other side of pressure sensor 6；Lead screw 1 passes through the center spiral shell of outer round nut 5 and interior square nut 2
Outer round nut 5 and interior square nut 2 are cascaded by pit；The center screw thread of the external thread parameter of lead screw 1 and outer round nut 5
Hole 5-1 is consistent with the thread form angle of the internal thread through hole 2-3 of interior square nut 2, rotation direction, lead.
Such as Fig. 2, outer round nut 5 is by screwed hole of centre 5-1, rectangular blind hole 5-2, several threaded holes 5-3 and exterior circular column
5-4 composition；The axis of exterior circular column 5-4 is overlapped with three line of center line of the axis of screwed hole of centre 5-1 and rectangular blind hole 5-2；
Several threaded holes 5-3 is radially uniformly distributed centered on the axis of screwed hole of centre 5-1.
Such as Fig. 3, interior square nut 2 is a structure of the square 2-1 with cylinder boss 2-2, has an internal thread through hole along center
2-3 has penetrated through square 2-1 and cylinder boss 2-2, and the center of square 2-1 is overlapped with the axis of cylinder boss 2-2；Square
The face size of 2-1 is consistent with the face size of rectangular blind hole 5-2 of outer round nut 5, the square 2-1 of interior square nut 2 and outer
Clearance fit is kept between the rectangular blind hole 5-2 of round nut 5.
Such as Fig. 4, the generally dish-shaped intermediate projections structure of diaphragm spring 3, there is a circular hole in centre, and outside is radial
Finger-type；The outer rim of radial finger-type of diaphragm spring 3 is in the same disc.
The working principle of the invention:
A kind of double nut elastic gap-eliminating preload of screw pair, is divided into interior square nut 2 and outer round nut 5 for an integral nut
Two parts, interior square nut 2 are embedded in the central square blind hole of outer round nut 5, are added between interior square nut 2 and outer round nut 5
Enter the special diaphragm spring 3 of one kind and adjustment pressure sensor 6, the elastic force for passing through diaphragm spring 3 realizes interior square nut 2 and outer circle
The compensation of abrasion loss between nut 5 and lead screw 1.Several pre-loading screws 4 arranged on outer 5 end face of round nut, by adjusting
Pre-loading screw 4 pushes pressure sensor 6 to compress diaphragm spring 3 and carries out pretightning force adjusting.
The course of work of the invention:
The screwed hole of centre 5-1 of outer round nut 5 is consistent with the thread form angle of the internal thread through hole 2-3 of interior square nut 2, rotation direction, lead,
Screwed hole of centre 5-1 and internal thread through hole 2-3 can be engaged with the external screw thread of lead screw 1；When processing, by interior square nut 2
It is fit directly into together with outer round nut 5, clamped one time completes the process the screwed hole of centre 5-1 and interior square nut 2 of outer round nut 5
Internal thread through hole 2-3, guarantee in square nut 2 internal thread through hole 2-3 it is consistent with the screwed hole of centre 5-1's of outer round nut 5
Property, and mark the relative position of interior square nut 2 and outer round nut 5；
Successively pressure sensor 6, diaphragm spring 3 and interior square nut 2 are put into the rectangular blind hole 5-2 of outer round nut 5, firmly squeezed
Square nut 2 makes diaphragm spring 3 generate precompressed compression deformation in pressing, and screws in lead screw 1 from the screwed hole of centre 5-1 of outer round nut 5 at this time,
And then lead screw 1 also screw in square nut 2 internal thread through hole 2-3 in, make interior square nut 2 and outer round nut 5 simultaneously with lead screw 1
Be screwed, and keep outer round nut 5 screwed hole of centre 5-1 and interior square nut 2 internal thread through hole 2-3 respectively with lead screw 1
Different thread segments screw thread not ipsilateral contact, thus generate preload effect；
Multiple pre-loading screws 4 are mounted in the axial threaded hole 5-3 of outer round nut 5, and the front end of pre-loading screw 4 contradicts pressure sensing
Device 6 can adjust the pretightning force of diaphragm spring 3 by adjusting the pretightning force of each pre-loading screw 4.
The adjusting method of internal axial pre tightening force of the square nut 2 between outer round nut 5 includes two aspects: first is that initial
When installation, interior square nut 2 is pressed into the depth in the rectangular blind hole of outer round nut 5, i.e., the big pretightning force for adjusting diaphragm spring 3, every time
Adjustment amount be all 1 screw pitch of lead screw integral multiple；Second is that the position to axial of adjustment pre-loading screw 4 and outer round nut 5, as
Finely tune the pretightning force of diaphragm spring 3.
Claims (4)
1. a kind of double nut elastic gap-eliminating of screw pair pre-tightens, it is characterised in that: including lead screw (1), interior square nut (2),
Diaphragm spring (3), several pre-loading screws (4), outer round nut (5) and pressure sensor (6)；Outer round nut (5) is cylindrical body,
There is rectangular blind hole in one end of cylindrical body, and the other end has a screwed hole of centre through-hole and several uniformly distributed minor thread through-holes；Pressure
Sensor (6) and interior square nut (2) are sequentially arranged in the rectangular blind hole of outer round nut (5)；The installation of several pre-loading screws (4)
In minor thread through-hole, the front end of pre-loading screw (4) heads on the side of pressure sensor (6)；The center hole of diaphragm spring (3)
Empty set is on the outside of the cylinder boss of interior square nut (2), the other side of the outside finger pressure of diaphragm spring (3) in pressure sensor (6)；
Lead screw (1) passes through the screwed hole of centre of outer round nut (5) and interior square nut (2), and outer round nut (5) and interior square nut (2) are gone here and there
It is linked togather；The interior spiral shell of the external thread parameter of lead screw (1) and the screwed hole of centre (5-1) of outer round nut (5) and interior square nut (2)
The thread form angle of line through-hole (2-3), rotation direction, lead are consistent.
2. a kind of double nut elastic gap-eliminating preload of screw pair according to right 1, it is characterised in that: outer round nut
(5) it is made of screwed hole of centre (5-1), rectangular blind hole (5-2), several threaded holes (5-3) and exterior circular column (5-4)；Outer circle
The axis of cylinder (5-4) is overlapped with three line of center line of the axis of screwed hole of centre (5-1) and rectangular blind hole (5-2)；Several
Threaded hole (5-3) is radially uniformly distributed centered on the axis of screwed hole of centre (5-1).
3. a kind of double nut elastic gap-eliminating preload of screw pair according to right 1, it is characterised in that: interior square nut
(2) it is the structure of a square (2-1) with cylinder boss (2-2), has an internal thread through hole (2-3) to penetrate through square along center
The center of (2-1) and cylinder boss (2-2), square (2-1) is overlapped with the axis of cylinder boss (2-2)；Square (2-1)
Face size is consistent with the face size of rectangular blind hole (5-2) of outer round nut (5), the square (2-1) of interior square nut (2) with
Clearance fit is kept between the rectangular blind hole (5-2) of outer round nut (5).
4. a kind of double nut elastic gap-eliminating preload of screw pair according to right 1, it is characterised in that: diaphragm spring
(3) there are a circular hole in generally dish-shaped intermediate projections structure, centre, and outside is radial finger-type；The spoke of diaphragm spring (3)
The outer rim of the finger-type of shape is penetrated in the same disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910335683.9A CN109944933A (en) | 2019-04-24 | 2019-04-24 | The double nut elastic gap-eliminating of screw pair pre-tightens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910335683.9A CN109944933A (en) | 2019-04-24 | 2019-04-24 | The double nut elastic gap-eliminating of screw pair pre-tightens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109944933A true CN109944933A (en) | 2019-06-28 |
Family
ID=67014638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910335683.9A Pending CN109944933A (en) | 2019-04-24 | 2019-04-24 | The double nut elastic gap-eliminating of screw pair pre-tightens |
Country Status (1)
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| CN (1) | CN109944933A (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1431489A (en) * | 1972-07-13 | 1976-04-07 | Csepeli Szerszamgepgyar | Double nut pre-loadable screw mechanism |
| GB1449635A (en) * | 1972-10-06 | 1976-09-15 | Nipkimmi | Ball nut assembly for lead screw |
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| CN104879461A (en) * | 2015-04-30 | 2015-09-02 | 湖北三江航天万峰科技发展有限公司 | Gapless thread adjusting mechanism |
| CN106286741A (en) * | 2016-10-12 | 2017-01-04 | 南京理工大学 | Double-screw nut ball leading screw secondary pretightening force measuring adjusting means and method |
| CN107336190A (en) * | 2017-05-19 | 2017-11-10 | 河钢股份有限公司承德分公司 | A kind of double-acting air cylinder piston and cylinder barrel separator |
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Application publication date: 20190628 |
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