CN220523210U - Planetary roller screw pair with safety nut - Google Patents
Planetary roller screw pair with safety nut Download PDFInfo
- Publication number
- CN220523210U CN220523210U CN202322316863.7U CN202322316863U CN220523210U CN 220523210 U CN220523210 U CN 220523210U CN 202322316863 U CN202322316863 U CN 202322316863U CN 220523210 U CN220523210 U CN 220523210U
- Authority
- CN
- China
- Prior art keywords
- thread
- nut
- safety
- screw rod
- safety nut
- 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
- 238000009434 installation Methods 0.000 claims description 7
- 238000005299 abrasion Methods 0.000 abstract description 5
- 239000011295 pitch Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Transmission Devices (AREA)
Abstract
The utility model relates to the technical field of planetary screw rod pairs, and provides a planetary roller screw rod pair with a safety nut, which comprises a screw rod, a first screw rod and a second screw rod, wherein the screw rod is provided with a first thread; the main nut is provided with a third thread, and the screw rod is sleeved with the main nut thread; the rollers are provided with a plurality of second threads which are arranged between the main nut and the screw rod at intervals along the circumference, the second threads are in threaded fit with the first threads, and the second threads are in threaded fit with the third threads; the safety nut is provided with a fourth thread, the safety nut is arranged on one side of the main nut and moves along with the main nut, and an alarm gap is formed after the fourth thread is matched with the first thread. Through the technical scheme, the problem that potential safety hazards are generated due to the fact that a failure screw pair cannot be replaced in time when fatigue and abrasion of the planetary roller screw in the prior art are serious is solved.
Description
Technical Field
The utility model relates to the technical field of planetary screw rod pairs, in particular to a planetary roller screw rod pair with a safety nut.
Background
The planetary roller screw is widely applied to the fields of aviation, aerospace, weaponry, robots and the like. The planetary roller screw has higher bearing capacity and impact resistance than the ball screw. The planetary roller screw has various structural forms such as standard, reverse rotation, circulation, and the like, and can be applied to various different demand occasions, however, the potential safety hazard caused by the failure of precision reduction or caused by fatigue abrasion in the long-term use process of the planetary roller screw is not paid enough attention, and when the fatigue abrasion of the planetary roller screw is serious, the potential safety hazard is generated due to the fact that the failure screw pair cannot be replaced in time, and the safety accident possibly occurs.
Disclosure of Invention
The utility model provides a planetary roller screw pair with a safety nut, which solves the problem that potential safety hazards are generated due to the fact that a failure screw pair cannot be replaced in time when fatigue and abrasion of a planetary roller screw in the related art are serious.
The technical scheme of the utility model is as follows:
a planetary roller screw assembly with a safety nut, comprising:
the screw rod is provided with a first thread;
the main nut is provided with a third thread, and the main nut is sleeved on the screw rod through the thread;
the rollers are provided with a plurality of second threads which are arranged between the main nut and the screw rod at intervals along the circumference, the second threads are in threaded fit with the first threads, and the second threads are in threaded fit with the third threads;
the safety nut is provided with a fourth thread, the safety nut is arranged on one side of the main nut and moves along with the main nut, and an alarm gap is formed after the fourth thread is matched with the first thread.
As a further technical scheme, the roller both ends have the gear, still include:
the gear rings are rotatably arranged at two sides of the main nut and are respectively meshed with a plurality of gears at two ends of the main nut, and an installation gap is formed between the two gear rings and the screw rod;
the retainer is provided with a plurality of through holes, the rollers are respectively and correspondingly arranged in the through holes in a rotating mode, and the retainer is positioned in the installation gap.
As a further technical scheme, the tooth form angle of the fourth thread is larger than the tooth form angle of the third thread and/or the tooth thickness of the fourth thread is smaller than the tooth thickness of the third thread, and the tooth form angle is in one of the following two forms or the following two forms.
As a further technical solution, the third thread and the fourth thread have the same pitch and number of starts.
As a further technical scheme, the first thread, the second thread and the third thread have the same structure.
As a further technical scheme, the safety nut is arranged on one side of the main nut through an elastic pin.
As a further technical solution, the safety nut has a first flange, the main nut has a second flange, and the first flange is connected with the second flange by screws.
The working principle and the beneficial effects of the utility model are as follows:
in order to solve the problem that potential safety hazards are generated due to the fact that a failure screw pair cannot be replaced in time when fatigue abrasion of a planetary roller screw in the related art is serious, the safety nut is designed and mainly used for failure early warning and safety self-locking of the planetary roller screw pair, the planetary roller screw pair applied to the safety nut is generally assembled by parts such as a screw, rollers, a main nut and the like, the main nut is meshed with teeth of the rollers, the rollers are meshed with teeth of the screw, and the safety nut is screwed with teeth of the screw. Under normal conditions, the first two parts are in a zero clearance or a small clearance in an engaged state, and the safety nut is not contacted with the teeth of the screw rod, but is just screwed. In failure state, the safety nut and the tooth side surface of the screw rod are contacted and stressed. When the main nut normally operates, the safety nut and the main nut can be synchronously screwed on the screw pair, but the tooth side surface of the safety nut is not contacted with the screw, and the safety nut does not bear working load. When the screw pair is worn for a long time to cause failure, the teeth of the safety nut are contacted with the teeth of the screw and meshed with the teeth to generate sliding friction force, and the tooth angle and the tooth thickness of the safety nut can ensure that the safety nut has self-locking characteristics.
Drawings
The utility model will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic view of a planetary screw pair with radially mounted safety nuts;
FIG. 2 is a schematic view of a planetary screw pair axially fitted with a safety nut;
FIG. 3 is a schematic view of the normal operation safety nut engaging with the lead screw;
FIG. 4 is a schematic view of the engagement of the safety nut with the screw upon failure;
FIG. 5 is a first thread, second thread and third thread contact state;
in the figure: 1. the screw rod, 2, the first screw thread, 3, the main nut, 4, the third screw thread, 5, the roller, 6, the second screw thread, 7, the safety nut, 8, the fourth screw thread, 9, the alarm clearance, 10, the gear ring, 11, the installation clearance, 12, the retainer, 13, the elastic pin, 14, the main nut is meshed with the roller screw thread, 15, the roller is meshed with the screw thread, 16, the safety nut is screwed with the screw thread.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1-5, the present embodiment proposes
A planetary roller screw assembly with a safety nut, comprising:
a screw 1 having a first thread 2;
the main nut 3 is provided with a third thread 4, and the main nut 3 is sleeved on the screw rod 1 in a threaded manner;
the rollers 5 are provided with a plurality of second threads 6, are arranged between the main nut 3 and the screw rod 1 at intervals along the circumference, and are in threaded fit with the first threads 2, and the second threads 6 are in threaded fit with the third threads 4;
the safety nut 7 is provided with a fourth thread 8, the safety nut 7 is arranged on one side of the main nut 3 and moves along with the main nut 3, and an alarm gap 9 is formed after the fourth thread 8 is matched with the first thread 2.
In this embodiment, in order to solve the problem that when the fatigue wear of the planetary roller 5 screw in the related art is serious, the safety nut 7 is designed according to the scheme because the failure screw pair cannot be replaced in time, the safety nut 7 is mainly used for failure early warning and safety self-locking of the planetary roller 5 screw pair, the planetary roller 5 screw pair applied by the safety nut 7 is generally assembled by parts such as the screw, the roller 5, the main nut 3 and the roller 5, the roller 5 and the screw are meshed, and the safety nut 7 and the screw are screwed. In normal conditions, the first two parts are in zero clearance or small clearance, and the safety nut 7 is not contacted with the teeth of the screw rod 1, but is just screwed. In the failure state, the safety nut 7 and the flank of the screw rod start to contact and bear force. When the main nut 3 operates normally, the safety nut 7 and the main nut 3 can be synchronously screwed on the screw pair, but the tooth side surface of the safety nut is not contacted with the screw, and the safety nut is not subjected to working load. When the screw pair is worn for a long time to cause failure, the teeth of the safety nut 7 are contacted with the teeth of the screw and meshed to generate sliding friction force, and the tooth angle and the tooth thickness of the safety nut 7 can ensure that the safety nut 7 has self-locking property.
Further, the roller 5 has gears at both ends, and further includes:
the two gear rings 10 are rotatably arranged at two sides of the main nut 3 and respectively meshed with a plurality of gears at two ends of the main nut 3, and the two gear rings 10 and the screw rod 1 form an installation gap 11;
the retainer 12 is provided with a plurality of through holes, the plurality of rollers 5 are respectively and correspondingly arranged in the plurality of through holes in a rotating way, and the retainer 12 is positioned in the installation gap 11.
In this embodiment, in order to prevent the roller 5 from disengaging during the high-speed movement, a retainer 12 is designed, the roller 5 rotates in the retainer 12, and the retainer 12 can rotate the threads of the plurality of rollers 5 on the screw 1 and the main nut 3 without mutual influence.
Further, the fourth thread 8 has a profile angle greater than that of the third thread 4 and/or the fourth thread 8 has a profile thickness less than that of the third thread 4 in one or both of the following forms.
In this embodiment, in order to realize the screwing of the safety nut 7, in order to realize the screwing problem of the safety nut 7 and the screw rod 1, the tooth angle and the tooth thickness of the main nut 3 and the safety nut 7 are designed, and since the main nut 3 is meshed with the roller 5 and the roller 5 is meshed with the screw rod 1, the tooth type design of the main nut 3 and the safety nut 7 can solve the problem.
Further, the third thread 4 and the fourth thread 8 have the same pitch and number of starts.
In this embodiment, in order to realize that the safety nut 7 operates normally under the condition of no failure, the thread pitches of the third thread 4 and the fourth thread 8 are the same, and the safety nut 7 can normally rotate when the main nut 3 drives the safety nut 7 to rotate.
Further, the first thread 2, the second thread 6 and the third thread 4 are identical in structure.
In this embodiment, in order to achieve the engagement of the screw rod 1 and the roller 5, and the engagement of the roller 5 and the main nut 3, the present solution designs the first thread 2, the second thread 6 and the third thread 4 to have the same structure, which has the same thread angle, thread thickness, thread pitch, etc.
Further, the safety nut 7 is provided on one side of the main nut 3 by an elastic pin 13.
In this embodiment, the safety nut 7 is a radial-installed planetary screw pair, the safety nut 7 is disposed on one side of the main nut 3, and is interference fit inside a hole of the main nut 3, and is fixed with the main nut 3 through a plurality of radial elastic pins 13.
Further, the safety nut 7 has a first flange, and the main nut 3 has a second flange, the first flange being screwed with the second flange.
In this embodiment, the safety nut 7 is an axially installed planetary screw pair, the flanged main nut 3 is sleeved on the outermost side of all parts, the flanged safety nut 7 is arranged on one side of the main nut 3 and is consistent with the flange outer diameter of the main nut 3, the two spigots are in tiny clearance fit, and the flanged safety nut 7 and the flanged main nut 3 are fixed through a plurality of axially distributed fastening screws.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (7)
1. A planetary roller screw pair with a safety nut, comprising:
a screw rod (1) having a first thread (2);
the main nut (3) is provided with a third thread (4), and the main nut (3) is sleeved on the screw rod (1) in a threaded manner;
the rollers (5) are provided with a plurality of second threads (6) which are arranged between the main nut (3) and the screw rod (1) at intervals along the circumference, the second threads (6) are in threaded fit with the first threads (2), and the second threads (6) are in threaded fit with the third threads (4);
the safety nut (7) is provided with a fourth thread (8), the safety nut (7) is arranged on one side of the main nut (3) and moves along with the main nut (3), and an alarm gap (9) is formed after the fourth thread (8) is matched with the first thread (2).
2. A planetary roller screw pair with a safety nut according to claim 1, characterized in that the rollers (5) have gears at both ends, further comprising:
the gear rings (10) are arranged at two sides of the main nut (3) in a rotating way, are meshed with a plurality of gears at two ends of the main nut (3) respectively, and the two gear rings (10) and the screw rod (1) form an installation gap (11);
the retainer (12) is provided with a plurality of through holes, the plurality of rollers (5) are respectively and correspondingly arranged in the plurality of through holes in a rotating mode, and the retainer (12) is positioned in the installation gap (11).
3. A planetary roller screw pair with a safety nut according to claim 1, characterized in that the thread form angle of the fourth thread (8) is greater than the thread form angle of the third thread (4) and/or the thread thickness of the fourth thread (8) is less than the thread thickness of the third thread (4) has one or both of the following forms.
4. A planetary roller screw pair with a safety nut according to claim 1, characterized in that the third thread (4) and the fourth thread (8) have the same pitch and number of starts.
5. A planetary roller screw pair with a safety nut according to claim 1, characterized in that the first thread (2), the second thread (6) and the third thread (4) are structurally identical.
6. A planetary roller screw pair with a safety nut according to claim 1, characterized in that the safety nut (7) is arranged on one side of the main nut (3) by means of a resilient pin.
7. A planetary roller screw assembly with a safety nut according to claim 1, characterized in that the safety nut (7) has a first flange and the main nut (3) has a second flange, the first flange being screwed with the second flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322316863.7U CN220523210U (en) | 2023-08-28 | 2023-08-28 | Planetary roller screw pair with safety nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322316863.7U CN220523210U (en) | 2023-08-28 | 2023-08-28 | Planetary roller screw pair with safety nut |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220523210U true CN220523210U (en) | 2024-02-23 |
Family
ID=89924021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322316863.7U Active CN220523210U (en) | 2023-08-28 | 2023-08-28 | Planetary roller screw pair with safety nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220523210U (en) |
-
2023
- 2023-08-28 CN CN202322316863.7U patent/CN220523210U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9360098B2 (en) | Strain wave drive with improved performance | |
| CN110107664B (en) | Reverse type planet roller screw rod of nut with large length-diameter ratio | |
| JPWO2004094870A1 (en) | Planetary differential screw type rotation-linear motion converter | |
| CN210770042U (en) | Rotary part driven by rolling body | |
| CN112049908A (en) | Planetary roller screw of gear transmission mode | |
| CN220523210U (en) | Planetary roller screw pair with safety nut | |
| CN105697619B (en) | Piston component in electric brake actuator | |
| CN112049907A (en) | Ring gear nut planet roller screw | |
| CN103062336A (en) | Rotating taper pin worm gear ring face worm transmission structure | |
| CN212536572U (en) | Ring gear nut planet roller screw | |
| CN209557592U (en) | A kind of automobile and its wheel side planetary gear speed reducing mechanism | |
| CN203035843U (en) | Rolling taper pin worm gear ring surface worm transmission structure | |
| CN112128328A (en) | Novel spiral transmission mechanism | |
| CN215487492U (en) | Uniform-load double-nut screw transmission device | |
| CN216951228U (en) | Bolted connection double insurance rotation stopping structure | |
| US20070170007A1 (en) | Ball screw drive mechanism for an elevator | |
| CN220600386U (en) | Synchronous pulley | |
| CN217586298U (en) | Meshing monitoring device for cycloid planetary transmission gear | |
| CN212564277U (en) | Planetary roller screw with involute helicoid | |
| CN220134542U (en) | Anti-interference planetary roller | |
| CN110219959A (en) | A kind of worm gear | |
| CN210531536U (en) | Planetary roller screw pair | |
| RU2714435C2 (en) | Planetary roller-screw transmission | |
| CN203294991U (en) | Coupling structure | |
| CN100523553C (en) | Worm wheel with roll wheel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |