CN216742690U - Gap eliminating device for high-precision screw rod transmission - Google Patents
Gap eliminating device for high-precision screw rod transmission Download PDFInfo
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- CN216742690U CN216742690U CN202220037269.7U CN202220037269U CN216742690U CN 216742690 U CN216742690 U CN 216742690U CN 202220037269 U CN202220037269 U CN 202220037269U CN 216742690 U CN216742690 U CN 216742690U
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Abstract
A gap eliminating device for high-precision screw rod transmission belongs to the field of machinery. Comprises a nut component and a screw rod; the nut component consists of a lower nut, an upper nut and a compression spring; an upward first extending part is arranged on the periphery of the lower nut; a second downward extending part is arranged on the periphery of the upper nut; the first extension part and the second extension part are sleeved with each other; a boss and a groove are correspondingly arranged on the opposite surfaces of the first extending part and the second extending part respectively; a first convex step is arranged on the periphery of the lower nut; a second convex step is arranged on the periphery of the upper nut; the compression spring is sleeved between the first convex step and the second convex step on the periphery of the upper nut and the lower nut. The double-nut structure is adopted, and the two nuts keep stable thread pitch in the process of rotating relative to the screw rod by arranging the compression spring; thereby producing a highly accurate transmission effect. The method can be widely applied to the field of design and manufacture of precise screw rod transmission devices.
Description
Technical Field
The utility model belongs to the field of machinery, and particularly relates to a gap eliminating device for high-precision screw rod transmission.
Background
In the mechanical transmission device, the screw rod transmission has the advantages of high transmission efficiency, high transmission precision, stable motion, capability of converting rotary motion into linear motion and converting the linear motion into rotary motion and the like, so the screw rod transmission is a common mechanical transmission device in the industry.
With the progress of science and technology and the development of industrial technology, people have higher and higher requirements on transmission precision, particularly in the field of small-load transmission application. In the machining process, although the external threads of the screw rod and the internal threads of the nut are controlled within a certain tolerance range, the fit clearance between the screw rod and the nut is objective all the time, and the transmission requirement of common precision can only be met but the transmission requirement of higher precision cannot be met.
The utility model discloses a nut structure for a trapezoidal screw pair, which is characterized in that the grant notice number is CN 214404569U, the grant notice date is 2021, 10 and 15, the utility model discloses a nut structure for the trapezoidal screw pair, which comprises a screw body, two mounting blocks and a nut body, the two mounting blocks are respectively and fixedly arranged at the two ends of the screw body, the nut body is sheathed at one end of the screw body in a threaded manner, one end of the nut body is fixedly provided with an anti-backlash lubrication component, the anti-backlash lubrication component comprises an anti-backlash helicoid, a wrapping cylinder, a T-shaped oil inlet pipe and a plurality of oil seepage pipes, the anti-backlash helicoid is fixedly arranged at one end of the nut body, the wrapping cylinder is fixedly sheathed outside the nut body and the anti-backlash helicoid, and anti-backlash fillers are filled between the wrapping cylinder and the nut body, the technical proposal can eliminate the clearance through the arranged clearance eliminating lubricating component, improve the integral running precision of the trapezoidal lead screw, through the lubricating component who sets up, play lubricated effect at the in-process of nut body and the operation of lead screw body.
The utility model discloses an authorized announcement number is CN 214197146U, the authorized announcement day is 2021 year 9 month 14 days's utility model patent, discloses a lead screw crack nut structure that disappears, including adjusting screw and with lead screw complex first nut and second nut, the one end that first nut is close to the second nut is provided with the screw hole, the terminal surface both sides of second nut are equipped with the screw hole that runs through the second nut, adjusting screw runs through the screw hole and stretches into the screw hole and link together first nut and second nut, be provided with the crack spring that disappears between first nut and the second nut, the one end and the first nut of crack spring that disappears are connected, the other end and the second nut of crack spring that disappears are connected. According to the technical scheme, the first nut and the second nut can be beneficial to eliminating a transmission gap of the screw rod through the adjusting screw, and the gap eliminating spring is arranged to be beneficial to keeping the stability of the distance between the first nut and the second nut.
The technical scheme has the problems of large integral volume and complex structure of the anti-backlash nut assembly, and is not suitable for a precision lead screw (also called a high-precision lead screw) transmission device with small load (for example, a precision lead screw transmission structure required to be used in an analytical instrument and the like).
The gap eliminating device with a simple structure is designed, so that the fit gap between the nut and the screw rod can be reduced, higher transmission precision is generated, and the stable and reliable motion of the whole screw rod motion pair can be ensured, which is very necessary.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a clearance eliminating device for high-precision screw transmission, which has a simple structure, is convenient to adjust, is stable and reliable, adopts a double-nut structure, and is connected with two nuts through a boss and a groove hasp, so that an adjusting space is reserved, the two nuts can be integrated and cannot be separated; the screw rod and the nut can eliminate the clearance between the internal thread and the external thread in the relative rotation process, so that the high-precision transmission effect is generated; the screw rod transmission device is suitable for screw rod transmission devices with high precision requirements, and is particularly suitable for small-load precise screw rod transmission devices.
The technical scheme of the utility model is as follows: the utility model provides a be used for driven gap eliminating device of high accuracy lead screw, characterized by:
the gap eliminating device consists of a nut component and a screw rod;
the nut component is coaxially sleeved on the screw rod;
the nut component consists of a lower nut, an upper nut and a compression spring;
an upward first extending part is arranged on the periphery of the lower nut; a second downward extending part is arranged on the periphery of the upper nut; the first extension part and the second extension part are sleeved with each other;
a boss and a groove are correspondingly arranged on the opposite surface or the opposite surface of the first extending part and the second extending part respectively;
a first convex step for limiting or fixing the compression spring is arranged on the periphery of the lower nut; a second convex step for limiting or fixing the compression spring is arranged on the periphery of the upper nut;
the compression spring is sleeved between the first convex step and the second convex step on the periphery of the upper nut and the lower nut.
Specifically, the first extension part and the second extension part are coaxially sleeved with each other.
Specifically, the boss and the groove are correspondingly and oppositely arranged.
If the first extension portion is coaxially sleeved on the outer periphery of the second extension portion, the inner periphery of the second extension portion is provided with the same internal thread as the upper nut.
If the first extension part is coaxially sleeved on the periphery of the second extension part, a boss is arranged on the periphery of the second extension part of the upper nut; a groove is formed in the inner periphery of the first extension of the lower nut.
If the second extension portion is coaxially and concentrically disposed on the outer periphery of the first extension portion, the inner periphery of the first extension portion is provided with the same internal thread as the lower nut.
If the second extending part is coaxially sleeved on the periphery of the first extending part, a boss is arranged on the periphery of the first extending part of the lower nut; a groove is formed in the inner periphery of the second extending portion of the upper nut.
Furthermore, the compression spring is limited by the first convex step and the second convex step and is coaxially sleeved on the periphery of the upper nut and the lower nut.
Specifically, the compression spring simultaneously applies a bidirectional jacking force to the upper nut and the lower nut.
According to the technical scheme, the upper nut and the lower nut are connected through the buckle or the hasp of the boss and the groove, so that the two nuts are combined into a whole.
Compared with the prior art, the utility model has the advantages that:
1. in the technical scheme, a double-nut structure is adopted, so that the pitch between internal threads can be conveniently adjusted, and the clearance between the internal threads and external threads of the screw rod is eliminated, so that the high precision of the transmission device is ensured;
2. according to the technical scheme, the adjustment is convenient, and after the screw rod is screwed into the nut, the gap between the screw rod and the nut can be adjusted by slightly screwing any nut;
3. in the technical scheme, the upper nut and the lower nut are connected through the lug boss and the groove buckle, so that an adjusting space is reserved, and the two nuts can be integrated and cannot be separated;
4. in the technical scheme, the compression spring always gives upward force to the upper nut and downward force to the lower nut, so that the two nuts keep stable thread pitches in the process of rotating relative to the screw rod;
5. the technical scheme is suitable for the screw rod transmission device with high precision requirement, and is particularly suitable for the precision screw rod transmission device with small load.
Drawings
FIG. 1 is a schematic cross-sectional view of the anti-backlash device of the present invention;
fig. 2 is a partially enlarged schematic view of a part a of the anti-backlash device.
In the figure, 1 is a nut component, 1-1 is a lower nut, 1-1a is a first extending part, 1-1b is a first convex step, 1-1-1 is a groove, 1-2 is an upper nut, 1-2a is a second extending part, 1-2b is a second convex step, 1-2-1 is a boss, 1-3 is a compression spring, and 2 is a screw rod.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
In fig. 1, the backlash eliminating device for high-precision screw transmission in the technical scheme is composed of a nut component 1 and a screw 2.
The screw rod 2 is screwed in the nut component 1, and the screw rod and the nut component move relatively along the spiral direction through external driving force.
Specifically, as shown in fig. 1, the nut assembly 1 is composed of a lower nut 1-1, an upper nut 1-2 and a compression spring 1-3; an upward first extending part 1-1a is arranged on the periphery of a first nut (lower nut for short) 1-1; a downward second extension part 1-2a is arranged on the periphery of a second nut (upper nut for short) 1-2; the first extending part and the second extending part are coaxially sleeved.
Specifically, the first extending part is coaxially sleeved on the outer periphery of the second extending part; alternatively, the second extension portion is coaxially disposed around the outer periphery of the first extension portion.
On the outer circumference of the lower nut, a first protruding step 1-1b for restricting or fixing the compression spring is provided.
On the outer circumference of the upper nut, a second protruding step 1-2b for limiting or fixing the compression spring is provided.
A boss and a groove are correspondingly arranged on opposite surfaces (or opposite surfaces) of the first extending part and the second extending part respectively, and the boss and the groove are correspondingly and oppositely arranged.
Specifically, if the first extension part is sleeved on the outer periphery of the second extension part, the inner periphery of the second extension part is provided with the same internal thread as the upper nut; if the second extension portion is fitted around the outer periphery of the first extension portion, the same female screw as the lower nut is provided on the inner periphery of the first extension portion (the same "screw" means the same pitch).
In fig. 2, the first extension portion is coaxially fitted around the outer periphery of the second extension portion (if the drawing is reversed, the second extension portion is considered to be coaxially fitted around the outer periphery of the first extension portion), and the boss 1-2-1 is provided on the outer periphery of the second extension portion of the upper nut; a groove 1-1-1 is provided in the inner periphery of the first extension of the lower nut.
The compression spring 1-3 is sleeved on the periphery of the first extending part of the lower nut; or the compression spring is limited by the first convex step 1-1b and the second convex step 1-2b and is coaxially sleeved on the periphery of the upper nut and the lower nut.
In actual assembly, taking the structure shown in fig. 1 or fig. 2 as an example, the upper nut 1-2 is pressed into the lower nut 1-1, and the boss 1-2-1 of the upper nut is clamped into the groove 1-1-1 of the lower nut. So that the nut assembly 1 becomes one body and cannot be separated.
The lower nut 1-1 and the upper nut 1-2 axially leave a certain space, and the axial clearance dimension W between the lower nut 1-1 and the upper nut can be adjusted.
The compression spring 1-3 is limited between the lower nut and the upper nut by the first convex step 1-1b of the lower nut and the second convex step 1-2b of the upper nut, because the length between the upper end and the lower end of the compression spring in a natural state (in an uncompressed state) is larger than the distance between the first convex step and the second convex step, after the upper nut is pressed into the lower nut, the compression spring is always in a compressed state, and generates and applies a downward force to the lower nut 1-1 along the longitudinal axis direction of the lead screw, and generates and applies an upward force to the upper nut 1-2 (namely the compression spring applies a bidirectional jacking force to the upper nut and the lower nut).
When the screw rod 2 is screwed in the nut component 1, the screw rod 2 is fixed, the nut component 1 is shaken along the axial direction, if a gap exists, the nut 1-1 or the nut 1-2 is screwed slightly until the nut component 1 has no gap.
The action principle is as follows: the lower nut 1-1 or the upper nut 1-2 is slightly screwed, and under the action of the bidirectional pushing force of the compression spring 1-3, the axial clearance W between the lower nut 1-1 and the upper nut 1-2 is changed, so that the pitch P of the internal thread between the lower nut 1-1 and the upper nut 1-2 is changed, and the clearance between the lower nut 1-1 and the external thread of the screw rod 2 is eliminated.
In the process of relative movement of the nut component 1 and the screw rod 2 along the spiral direction, the adjusted screw pitch P can be kept unchanged all the time due to the action of the compression springs 1-3. Therefore, the gap eliminating device not only can improve the precision of the screw rod transmission device, but also is stable and reliable.
The utility model adopts a double-nut structure, two nuts are connected through the buckle or the hasp of the boss and the groove, an adjusting space is reserved, the two nuts can be combined into a whole without disengaging, the structure is simple, the number of components is small, the screw pitch between internal threads can be conveniently adjusted, and the clearance between the internal threads and the external threads of the screw rod is eliminated, so that the high precision of the transmission device is ensured; after the screw rod is screwed into the nut, the gap between the screw rod and the nut can be adjusted by slightly screwing any nut; the two nuts keep stable thread pitch in the process of rotating relative to the screw rod by arranging the compression spring; the whole device is simple in structure, convenient to adjust, stable and reliable, and capable of eliminating the gap between the internal thread and the external thread in the relative rotation process of the screw rod and the nut, so that a high-precision transmission effect is generated.
The utility model can be widely applied to the field of design and manufacture of precise screw rod transmission devices.
Claims (10)
1. A clearance eliminating device for high-precision screw rod transmission is characterized in that:
the gap eliminating device consists of a nut component and a screw rod;
the nut component is coaxially sleeved on the screw rod;
the nut component consists of a lower nut, an upper nut and a compression spring;
an upward first extending part is arranged on the periphery of the lower nut;
a second downward extending part is arranged on the periphery of the upper nut;
the first extension part and the second extension part are sleeved with each other;
a boss and a groove are correspondingly arranged on the opposite surface or the opposite surface of the first extending part and the second extending part respectively;
a first convex step for limiting or fixing the compression spring is arranged on the periphery of the lower nut;
a second convex step for limiting or fixing the compression spring is arranged on the periphery of the upper nut;
the compression spring is sleeved between the first convex step and the second convex step on the periphery of the upper nut and the lower nut.
2. The backlash elimination device for a high-precision lead screw transmission according to claim 1, wherein the first extension portion and the second extension portion are coaxially sleeved with each other.
3. The backlash elimination device for high-precision lead screw transmission according to claim 1, wherein said boss and said groove are oppositely disposed in position.
4. The backlash eliminating device for the high-precision screw drive according to claim 1, wherein the first extension is coaxially disposed around an outer periphery of the second extension in a sleeved manner, and an inner periphery of the second extension is provided with an inner thread identical to that of the upper nut.
5. The backlash elimination device for the high-precision screw rod transmission according to claim 1 or 4, wherein the first extension part is coaxially sleeved on the outer periphery of the second extension part, and a boss is arranged on the outer periphery of the second extension part of the upper nut; a groove is formed in the inner periphery of the first extension of the lower nut.
6. The backlash eliminating device for the high-precision screw drive according to claim 1, wherein the second extension is coaxially fitted around an outer periphery of the first extension, and an inner periphery of the first extension is provided with an inner thread identical to that of the lower nut.
7. The backlash elimination device for the high-precision lead screw transmission according to claim 1 or 6, wherein the second extension part is coaxially sleeved on the outer periphery of the first extension part, and a boss is arranged on the outer periphery of the first extension part of the lower nut; a groove is formed in the inner periphery of the second extending portion of the upper nut.
8. The backlash elimination device for a high-precision lead screw transmission according to claim 1, wherein the compression spring is restrained by a first protruding step and a second protruding step, and is concentrically disposed around the outer peripheries of the upper and lower nuts.
9. The backlash elimination device for a high precision screw drive according to claim 1, wherein said compression spring applies a bidirectional thrust force to said upper and lower nuts simultaneously.
10. The backlash elimination device for high-precision lead screw transmission according to claim 1, wherein the upper nut and the lower nut are connected with each other by a buckle or a hasp of a boss and a groove, so that the two nuts are combined into a whole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220037269.7U CN216742690U (en) | 2022-01-07 | 2022-01-07 | Gap eliminating device for high-precision screw rod transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220037269.7U CN216742690U (en) | 2022-01-07 | 2022-01-07 | Gap eliminating device for high-precision screw rod transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216742690U true CN216742690U (en) | 2022-06-14 |
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ID=81912247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220037269.7U Active CN216742690U (en) | 2022-01-07 | 2022-01-07 | Gap eliminating device for high-precision screw rod transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216742690U (en) |
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2022
- 2022-01-07 CN CN202220037269.7U patent/CN216742690U/en active Active
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