CN221300005U - Gap eliminating structure of screw motor - Google Patents
Gap eliminating structure of screw motorInfo
- Publication number
- CN221300005U CN221300005U CN202323470688.3U CN202323470688U CN221300005U CN 221300005 U CN221300005 U CN 221300005U CN 202323470688 U CN202323470688 U CN 202323470688U CN 221300005 U CN221300005 U CN 221300005U
- Authority
- CN
- China
- Prior art keywords
- screw nut
- screw
- lead screw
- nut
- sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 230000008030 elimination Effects 0.000 claims 6
- 238000003379 elimination reaction Methods 0.000 claims 6
- 230000005540 biological transmission Effects 0.000 abstract description 10
- 230000033001 locomotion Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Abstract
The utility model relates to a gap eliminating structure of a screw motor, which comprises an inner screw nut and a screw, wherein the inner screw nut is in threaded connection with the screw, the inner screw nut is driven to rotate by a rotor, the screw motor further comprises an outer screw nut and a jacking screw sleeve, the outer screw nut is in threaded connection with the screw, the outer screw nut is connected with the inner screw nut and synchronously rotates, the jacking screw sleeve is in threaded connection with the peripheral wall of the outer screw nut, and one end, close to the inner screw nut, of the jacking screw sleeve abuts against the inner screw nut; the pushing screw sleeve is rotated in the direction of the inner screw nut, and pushing forces on the inner screw nut and the outer screw nut are respectively generated by the pushing screw sleeve, so that a transmission gap between the inner screw nut and the screw rod is eliminated, the transmission precision is greatly improved, and the technical problem that the transmission precision is influenced by an axial gap between the screw nut of the screw rod motor and the screw rod in the prior art is solved.
Description
Technical Field
The utility model relates to the technical field of screw rod motors, in particular to a gap eliminating structure of a screw rod motor.
Background
The screw motor can convert rotary motion into linear motion and is widely applied to various devices. The screw motor generally comprises a stator, a rotor, a screw nut, a screw, a front end cover and a rear end cover, wherein the stator, the rotor and the screw nut are arranged in the front end cover and the rear end cover, the screw nut is in threaded connection with the screw, the screw nut is driven to rotate by the rotor, and the rotating screw nut performs linear motion on the screw, so that rotary motion is converted into linear motion. However, in the structure of screw nut and screw threaded connection, there is often an axial gap between the screw teeth of the screw nut and the screw teeth of the screw, so that when the rotor of the motor drives the screw nut to rotate, there is a difference between the linear distance of the actual movement of the screw nut and the expected distance, which affects the transmission precision, especially when the screw motor is used on some precision equipment, the influence of the axial gap between the screw nut and the screw on the transmission precision is more serious.
Disclosure of utility model
Aiming at the defects of the prior art, the utility model aims to provide a clearance eliminating structure of a screw rod motor, so as to solve the technical problem that the transmission precision is influenced by the axial clearance between a screw rod nut of the screw rod motor and a screw rod in the prior art.
In order to solve the technical problems, the utility model provides a gap eliminating structure of a screw motor, which comprises an inner screw nut and a screw, wherein the inner screw nut is in threaded connection with the screw and driven to rotate by a rotor, the screw motor further comprises an outer screw nut and a jacking screw sleeve, the outer screw nut is in threaded connection with the screw, the outer screw nut is connected with the inner screw nut and synchronously rotates, the jacking screw sleeve is in threaded connection with the peripheral wall of the outer screw nut, and one end, close to the inner screw nut, of the jacking screw sleeve abuts against the inner screw nut.
After the structure is adopted, the gap eliminating structure of the screw motor has the following advantages: the screw rod is provided with the outer screw nut and the jacking screw sleeve, the jacking screw sleeve is rotated to enable the jacking screw sleeve to jack the inner screw nut towards the direction of the inner screw nut, the inner screw nut is subjected to jacking force of the jacking screw sleeve, the screw teeth of the inner screw nut are clung to the screw teeth of the screw rod in the direction away from the outer screw nut, the jacking screw sleeve is subjected to reaction force of the inner screw nut, the screw teeth of the jacking screw sleeve are clung to the outer screw teeth of the outer screw nut in the direction away from the inner screw nut, and meanwhile the reaction force is transmitted to the outer screw nut through the jacking screw sleeve, so that the screw teeth of the inner screw nut are clung to the screw teeth of the screw rod in the direction away from the inner screw nut, in other words, the jacking screw sleeve is rotated towards the direction of the inner screw nut, the jacking screw nut and the outer screw nut respectively, so that transmission gaps between the inner screw nut and the screw rod are eliminated, transmission accuracy is greatly improved, and the outer screw nut and the inner screw nut cannot normally move due to synchronous rotation of the outer screw nut and the inner screw nut when the rotor drives the inner screw nut to rotate.
As an improvement, a gasket is sleeved on the inner screw nut, and one end, which is tightly propped against the screw sleeve and is close to the inner screw nut, is propped against the gasket; by adopting the structure, the jacking force of the jacking screw sleeve is transmitted to the inner screw nut through the gasket, the transmission of force can be realized without changing the structure of the inner screw nut, the structure is simpler, and the gasket is arranged into an elastic structure and can be matched with the jacking screw sleeve so as to provide more stable thrust to two sides for the inner screw nut and the outer screw nut.
As an improvement, the utility model also comprises an end cover, wherein a mounting cavity is arranged in the end cover, an inner screw nut is rotatably connected in the end cover, one end, close to the outer screw nut, of the inner screw nut is exposed out of the mounting cavity, the gasket comprises a connecting part and an abutting part, the connecting part is sleeved on the inner screw nut, the abutting part is circumferentially connected on the peripheral wall of the connecting part along the connecting part, the abutting part is positioned out of the mounting cavity, and the abutting part abuts against the tightening screw sleeve; by adopting the structure, one end of the inner screw nut and the abutting part are exposed out of the mounting cavity of the end cover, so that the tightening screw sleeve does not need to extend into the mounting cavity to abut against the abutting part, the whole structure is simpler, and the installation is more convenient.
As an improvement, the inner screw nut is rotationally connected with the end cover through a bearing, the inner screw nut is in interference fit with the bearing inner ring, one end of the connecting part is positioned in the mounting cavity and props against the bearing inner ring, the other end of the connecting part is exposed out of the mounting cavity, and the abutting part is sleeved on the outer peripheral wall of the other end of the connecting part; by adopting the structure, the jacking force of the jacking screw sleeve is transmitted to the inner screw nut through the gasket, the jacking force is transmitted to the bearing inner ring through the gasket, and then the jacking force is transmitted to the inner screw nut through the bearing inner ring, so that the jacking force of the jacking screw sleeve on the inner screw nut is ensured.
As an improvement, the abutting part is close to one end face of the jacking screw sleeve, the connecting part is close to one end face of the jacking screw sleeve and the inner screw nut is flush with one end face of the jacking screw sleeve.
As an improvement, a ring convex part is connected on the peripheral wall of the outer screw nut along the circumferential direction, and a torsion spring is connected between the end surface of the jacking screw sleeve, which is far away from the inner screw nut, and the ring convex part; by adopting the structure, in the use process of the screw rod motor, the jacking screw sleeve can move away from the direction of the inner screw rod nut due to the influence of vibration and the like to reduce or lose the jacking effect, so that the jacking screw sleeve is prevented from moving by arranging the torsion spring between the jacking screw sleeve and the ring convex part and generating thrust to two sides by the torsion spring.
As an improvement, the inner screw nut is connected with a protruding part, the outer screw nut is connected with a groove matched with the protruding part, and the protruding part is inserted in the groove to enable the inner screw nut and the outer screw nut to synchronously rotate; the structure has the advantages of simple structure and stable transmission.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model.
Fig. 2 is a schematic diagram of a connection structure of an inner lead screw nut and an outer lead screw nut in the present utility model.
Reference numerals: 1. an inner lead screw nut; 2. a screw rod; 3. a rotor; 4. an outer lead screw nut; 5. tightly pushing the screw sleeve; 6. a gasket; 61. a connection part; 62. an abutting portion; 7. a mounting cavity; 8. a bearing; 9. a ring protrusion; 10. a torsion spring; 11. a protruding portion; 12. a groove; 13. a stator; 14. a front end cover; 15. and a rear end cover.
Detailed Description
The clearance eliminating structure of the screw motor is described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 2, a gap eliminating structure of a lead screw motor comprises an end cover, a stator 13, a rotor 3, an inner lead screw nut 1 and a lead screw 2, wherein the end cover comprises a front end cover 14 and a rear end cover 15, the front end cover 14 and the rear end cover 15 are spliced on two sides of the stator 13, the rotor 3 is connected with an inner ring of the stator 13, the inner lead screw nut 1 is connected with the inner ring of the rotor 3, the inner lead screw nut 1 is in threaded connection with the lead screw 2, and the inner lead screw nut 1 is driven to rotate by the rotor 3; the utility model also comprises an outer screw nut 4 and a jacking screw sleeve 5, wherein the outer screw nut 4 is connected to the screw rod 2 in a threaded manner and is at one side close to the front end cover 14, the outer screw nut 4 is connected with the inner screw nut 1 and rotates synchronously, as shown in fig. 2, the inner screw nut 1 is connected with a protruding part 11, the protruding part 11 is arranged along the axial direction parallel to the inner screw nut 1, the outer screw nut 4 is connected with a groove 12 matched with the protruding part 11, namely, the shape and the size of the groove 12 are the same as those of the protruding part 11, and the protruding part 11 is inserted into the groove 12 so that the inner screw nut 1 rotates synchronously with the outer screw nut 4.
As shown in fig. 1, a tightening screw sleeve 5 is in threaded connection with the outer peripheral wall of the outer screw nut 4, one end, close to the inner screw nut 1, of the tightening screw sleeve 5 abuts against the inner screw nut 1, and the tightening screw sleeve 5 abuts against the inner screw nut 1 directly or indirectly, in this embodiment, the tightening screw sleeve 5 abuts against the inner screw nut 1 indirectly, specifically, a washer 6 is sleeved on the inner screw nut 1, and one end, close to the inner screw nut 1, of the tightening screw sleeve 5 abuts against the washer 6.
As shown in fig. 1, a mounting cavity 7 is provided in the end cover, the inner screw nut 1 is rotatably connected with the end cover through bearings 8, namely, the inner screw nut 1 is rotatably connected with the front end cover 14 and the rear end cover 15 through two bearings 8, one end of the inner screw nut 1, which is close to the outer screw nut 4, is exposed out of the mounting cavity 7, the gasket 6 comprises a connecting portion 61 and an abutting portion 62, the connecting portion 61 is sleeved on the inner screw nut 1, the abutting portion 62 is circumferentially connected on the outer peripheral wall of the connecting portion 61 along the connecting portion 61, the abutting portion 62 is positioned out of the mounting cavity 7, the abutting portion 62 abuts against the tightening screw sleeve 5, the connecting portion 61 is integrally formed with the abutting portion 62, the inner screw nut 1 is in interference fit with the inner ring of the bearings 8, one end of the connecting portion 61 is positioned in the mounting cavity 7 and abuts against the inner ring of the bearings 8, the other end of the connecting portion 61 is exposed out of the mounting cavity 7, the abutting portion 62 is sleeved on the outer peripheral wall of the other end of the connecting portion 61, one end face of the abutting portion 62, which is close to the tightening screw sleeve 5, the end face of the connecting portion 61 is adjacent to the end face of the tightening screw sleeve 5, and the end face of the tightening screw nut is close to the tightening screw sleeve 5.
As shown in fig. 1, a ring convex part 9 is connected on the outer circumferential wall of the outer screw nut 4 along the circumferential direction, the ring convex part 9 and the outer screw nut 4 are integrally formed, the jacking screw sleeve 5 is positioned between the gasket 6 and the ring convex part 9, a torsion spring 10 is connected between the end surface of the jacking screw sleeve 5, which is far away from the inner screw nut 1, and the ring convex part 9, and the torsion spring 10 applies thrust to the jacking screw sleeve 5 and the ring convex part 9 towards two sides.
The screw rod 2 is provided with the outer screw nut 4 and the jacking screw sleeve 5, the jacking screw sleeve 5 is rotated to enable the jacking screw sleeve 5 to jack the inner screw nut 1 towards the direction of the inner screw nut 1, particularly the gasket 6, the gasket 6 is of a deformable elastic structure, the inner screw nut 1 is tightly abutted against the screw teeth of the jacking screw sleeve 5 transmitted by the gasket 6 and the inner ring of the bearing 8, the screw teeth of the inner screw nut 1 are tightly abutted against the screw teeth of the screw rod 2 in the direction away from the outer screw nut 4, the jacking screw sleeve 5 is subjected to the reaction force of the inner screw nut 1 (the gasket 6), the screw teeth of the jacking screw sleeve 5 are tightly abutted against the outer screw teeth of the outer screw nut 4 in the direction away from the inner screw nut 1, and meanwhile the reaction force is transmitted to the outer screw nut 4 through the jacking screw sleeve 5, so that the screw teeth of the inner screw threads of the outer screw nut 4 are tightly abutted against the screw teeth of the screw rod 2 in the direction away from the inner screw nut 1, in other words, the inner screw nut 1 is rotated in the direction through the jacking screw nut 1, the matching 6 is tightly abutted against the screw teeth of the inner screw nut 1, and the inner screw nut 1 is respectively tightly abutted against the screw teeth of the inner screw nut 1 and the outer screw nut 4, and the screw nut 1 is not tightly abutted against the outer screw nut 4 in the direction of the inner screw nut 1, and the inner screw nut 1 is greatly influenced by the rotation of the inner screw nut 1 and the inner screw nut 1, and the normal rotation precision is greatly influenced by the rotation of the inner screw nut and the inner screw nut.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above-described one embodiment, and all other examples obtained by those skilled in the art without making any inventive effort are within the scope of the present utility model.
Claims (7)
1. The utility model provides a lead screw motor clearance elimination structure, includes interior lead screw nut (1) and lead screw (2), interior lead screw nut (1) threaded connection is in on lead screw (2), interior lead screw nut (1) are rotated by rotor (3) drive, its characterized in that still includes outer lead screw nut (4) and tight swivel nut (5) in top, outer lead screw nut (4) threaded connection is in on lead screw (2), outer lead screw nut (4) with interior lead screw nut (1) are connected and synchronous rotation, tight swivel nut (5) threaded connection is in on the peripheral wall of outer lead screw nut (4), on the tight swivel nut (5) of top and be close to one end of interior lead screw nut (1) with interior lead screw nut (1) offset.
2. The screw motor clearance elimination structure according to claim 1, wherein a gasket (6) is sleeved on the inner screw nut (1), and one end, which is close to the inner screw nut (1), of the tightening screw sleeve (5) abuts against the gasket (6).
3. The screw motor clearance elimination structure according to claim 2, further comprising an end cover, wherein a mounting cavity (7) is arranged in the end cover, the inner screw nut (1) is rotatably connected in the end cover, one end, close to the outer screw nut (4), of the inner screw nut (1) is exposed out of the mounting cavity (7), the gasket (6) comprises a connecting portion (61) and an abutting portion (62), the connecting portion (61) is sleeved on the inner screw nut (1), the abutting portion (62) is circumferentially connected to the outer peripheral wall of the connecting portion (61) along the connecting portion (61), the abutting portion (62) is located out of the mounting cavity (7), and the abutting portion (62) abuts against the tightening screw sleeve (5).
4. A lead screw motor clearance elimination structure according to claim 3, characterized in that the inner lead screw nut (1) is rotatably connected with the end cover through a bearing (8), the inner lead screw nut (1) is in interference fit with an inner ring of the bearing (8), one end of the connecting portion (61) is located in the installation cavity (7) and abuts against the inner ring of the bearing (8), the other end of the connecting portion (61) is exposed out of the installation cavity (7), and the abutting portion (62) is sleeved on an outer peripheral wall of the other end of the connecting portion (61).
5. A screw motor gap eliminating structure according to claim 3, wherein the abutting portion (62) is flush with one end face of the tightening screw sleeve (5), one end face of the connecting portion (61) and the tightening screw sleeve (5), and one end face of the inner screw nut (1) and the tightening screw sleeve (5).
6. The screw motor clearance elimination structure according to claim 1, wherein a ring convex part (9) is connected on the peripheral wall of the outer screw nut (4) along the circumferential direction, and a torsion spring (10) is connected between the end surface of the jacking screw sleeve (5) far from the inner screw nut (1) and the ring convex part (9).
7. A lead screw motor clearance elimination structure according to claim 1, characterized in that the inner lead screw nut (1) is connected with a protruding part (11), the outer lead screw nut (4) is connected with a groove (12) matched with the protruding part (11), and the protruding part (11) is inserted into the groove (12) so that the inner lead screw nut (1) and the outer lead screw nut (4) rotate synchronously.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221300005U true CN221300005U (en) | 2024-07-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant |