CN111895062A - Planetary roller screw pair - Google Patents
Planetary roller screw pair Download PDFInfo
- Publication number
- CN111895062A CN111895062A CN202010659139.2A CN202010659139A CN111895062A CN 111895062 A CN111895062 A CN 111895062A CN 202010659139 A CN202010659139 A CN 202010659139A CN 111895062 A CN111895062 A CN 111895062A
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- Prior art keywords
- gear ring
- roller
- screw
- screw rod
- retainer
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- 230000033001 locomotion Effects 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
- F16H25/2252—Planetary rollers between nut and screw
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
- F16H2025/2271—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers with means for guiding circulating rollers
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention relates to a planetary roller screw pair, belonging to the field of design of planetary roller screw pairs; the device comprises a nut, a right gear ring, a retainer, a lead screw, a left gear ring, n rollers and 2 locking screws; wherein the screw rod is axially and horizontally arranged; the retainer is sleeved on the outer wall of the screw rod; the n rollers are uniformly embedded in the retainer along the circumferential direction, are all arranged in parallel with the axis of the screw rod, and are all in threaded fit with the screw rod; the nut is sleeved on the outer wall of the retainer; the left gear ring and the right gear ring are both arranged on the inner wall of the nut and are sleeved on the outer walls of the n rollers; the left gear ring is correspondingly arranged at the axial left end position of the roller; the right gear ring is correspondingly arranged at the axial right end of the roller; the left gear ring and the right gear ring are fixedly connected with the nut through 1 locking screw respectively; n is a positive integer; the split type roller bearing has the characteristics of simple structure, high precision, strong bearing capacity, stable motion and the like, solves the problem that the split type retainer cannot limit the inclination of the roller at high precision, and simultaneously improves the bearing capacity of the screw pair.
Description
Technical Field
The invention belongs to the field of design of planetary roller screw pairs, and relates to a planetary roller screw pair.
Background
The common types of the planetary roller screw pair comprise RV, RVI, differential type and the like, the types are various, however, the retainer generally adopts a two-end split floating type structure, axial limiting is carried out by depending on a retainer ring and the like, the two-end floating type retainers are mutually independent (mutually free of circumferential constraint), mutual torsional displacement cannot be avoided, the rollers are caused to deviate relative to the axis of the screw under the action of bearing thread force, the bearing performance of the roller screw pair is poor, and the transmission precision and the stability are reduced.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the planetary roller screw pair has the characteristics of simple structure, high precision, strong bearing capacity, stable motion and the like, the problem that the split type retainer cannot limit the inclination of the rollers at high precision is solved, and the bearing capacity of the screw pair is improved.
The technical scheme of the invention is as follows:
a planetary roller screw pair comprises a nut, a right gear ring, a retainer, a screw, a left gear ring, n rollers and 2 locking screws; wherein the screw rod is axially and horizontally arranged; the retainer is sleeved on the outer wall of the screw rod; the n rollers are uniformly embedded in the retainer along the circumferential direction, are all arranged in parallel with the axis of the screw rod, and are all in threaded fit with the screw rod; the nut is sleeved on the outer wall of the retainer; the left gear ring and the right gear ring are both arranged on the inner wall of the nut and are sleeved on the outer walls of the n rollers; the left gear ring is correspondingly arranged at the axial left end position of the roller; the right gear ring is correspondingly arranged at the axial right end of the roller; the left gear ring and the right gear ring are fixedly connected with the nut through 1 locking screw respectively; n is a positive integer.
In the above planetary roller screw pair, the cage includes 2 annular frames and 1 columnar frame; 2 annular frames are coaxially arranged in an axial horizontal mode; the columnar frame is coaxially arranged among the 2 annular frames; n rectangular through holes are uniformly formed in the columnar frame along the circumferential direction; each roller is correspondingly embedded in 1 through hole.
In the planetary roller screw pair, the circumferential outer wall of the screw is provided with threads; inner teeth are arranged on the inner walls of the right gear ring and the left gear ring; outer teeth are arranged on the outer wall of the axial middle part and the outer walls of the axial two ends of the roller; wherein, the screw thread in the middle of the roller is correspondingly matched with the screw thread of the screw rod; and outer teeth at two axial ends of the roller are respectively meshed and matched with the inner teeth of the right gear ring and the left gear ring.
In the planetary roller screw pair, when the screw rotates along the axial direction, the n rollers are matched with the screw thread of the screw, so that the n rollers perform planetary rotation around the circumferential direction of the screw and perform axial movement relative to the screw, and the retainer is driven to rotate around the screw and perform axial movement relative to the screw.
In the planetary roller screw pair, the number of teeth and the number of teeth of the right gear ring and the left gear ring are the same; the inner teeth of the right gear ring and the outer teeth at the axial corresponding end of the roller have the same rotating direction; the inner teeth of the left gear ring and the outer teeth at the axial corresponding end of the roller have the same rotating direction; the nut is driven by the roller to synchronously rotate and translate relative to the screw rod, and the nut and the roller do not have relative axial movement.
In the planetary roller screw pair, the width A of the rectangular through hole is equal to the diameter B of the roller; and the retainer does not limit the radial direction of the roller.
In the planetary roller screw pair, the nut rotates around the screw rod for one circle, and the nut axially translates relative to the screw rod by a lead distance.
In the planetary roller screw pair, the minimum inner diameter of the columnar frame is larger than the maximum outer diameter of the screw; the maximum outer diameter of the columnar frame is smaller than the minimum inner diameter of the nut; the 2 annular frames are respectively in sliding fit with the right gear ring and the left gear ring.
In the planetary roller screw pair described above, the length L of the rectangular through hole is greater than the roller length L1.
In the planetary roller screw pair, n is more than or equal to 9 and less than or equal to 12.
Compared with the prior art, the invention has the beneficial effects that:
(1) the integral type retainer planet roller screw pair designed by the invention has the characteristics of simple structure, high precision, strong bearing capacity, stable motion and the like;
(2) the retainer is innovatively designed, the axial and circumferential limiting of all the rollers is realized, the problem that the split type retainer cannot limit the inclination of the rollers at high precision is solved, and the transmission of the screw pair is more stable;
(3) the invention also saves the original axial limiting structure of the retainer while designing the retainer, so that the thread bearing length is lengthened under the same condition, and the bearing capacity of the screw pair is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of a planetary roller screw pair of the present invention;
FIG. 2 is a schematic view of the cage of the present invention;
fig. 3 is a right side view of the planetary roller screw set of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
The invention provides an integral type retainer planet roller screw pair, which has the characteristics of simple structure, high precision, strong bearing capacity, stable motion and the like, solves the problem that a split type retainer cannot limit the inclination of rollers at high precision, and enables the transmission of the screw pair to be more stable; meanwhile, an original axial limiting structure of the retainer is omitted, so that the thread bearing length is prolonged under the same condition, and the bearing capacity of the screw pair is improved.
In order to prevent the roller of the planetary roller screw from inclining relative to the screw and improve the stability of the planetary movement of the roller, the invention designs a novel planetary roller screw planetary retainer structure. The stability, the precision and the bearing capacity of the planetary motion of the roller can be improved. The concrete structure is shown in figure 1, and mainly comprises a nut 1, a right gear ring 2, a retainer 3, a screw rod 4, a left gear ring 5, n rollers 6 and 2 locking screws 7; wherein, the screw rod 4 is axially and horizontally arranged; the retainer 3 is sleeved on the outer wall of the screw rod 4; the n rollers 6 are uniformly embedded in the retainer 3 along the circumferential direction, the n rollers 6 are all arranged in parallel with the axis of the screw rod 4, and the n rollers 6 are all in threaded fit with the screw rod 4; the nut 1 is sleeved on the outer wall of the retainer 3; the left gear ring 5 and the right gear ring 2 are both arranged on the inner wall of the nut 1 and are sleeved on the outer walls of the n rollers 6; wherein, the left gear ring 5 is correspondingly arranged at the axial left end position of the roller 6; the right gear ring 2 is correspondingly arranged at the axial right end of the roller 6; the left gear ring 5 and the right gear ring 2 are fixedly connected with the nut 1 through 1 locking screw 7 respectively; n is a positive integer, and n is more than or equal to 9 and less than or equal to 12.
The retainer 3 is used as a limiting mechanism for the roller 6 in the innovative design of the invention, and particularly as shown in fig. 2, the retainer 3 comprises 2 annular frames 31 and 1 columnar frame 32; 2 annular frames 31 are coaxially arranged in an axial horizontal manner; the columnar frame 32 is coaxially arranged between the 2 annular frames 31; the columnar frame 32 is uniformly provided with n rectangular through holes 321 along the circumferential direction; each roller 6 is inserted into 1 through hole 321. As shown in fig. 3, the width a of the rectangular through-hole 321 is equal to the diameter B of the roller 6; and the retainer 3 does not limit the radial direction of the roller 6. The minimum inner diameter of the columnar frame 32 is larger than the maximum outer diameter of the lead screw 4; the maximum outer diameter of the columnar frame 32 is smaller than the minimum inner diameter of the nut 1; the 2 annular frames 31 are respectively in sliding fit with the right gear ring 2 and the left gear ring 5. The length L of the rectangular through-hole 321 is greater than the length L1 of the roller 6.
The circumferential outer wall of the screw rod 4 is provided with threads; inner teeth are arranged on the inner walls of the right gear ring 2 and the left gear ring 5; outer teeth are arranged on the outer wall of the axial middle part and the outer walls of the axial two ends of the roller 6; wherein, the screw thread in the middle of the roller 6 is correspondingly matched with the screw thread of the screw rod 4; and external teeth at two axial ends of the roller 6 are respectively meshed and matched with the internal teeth of the right gear ring 2 and the left gear ring 5. When the screw rod 4 rotates along the axial direction, the n rollers 6 are matched with the screw rod 4 through threads, the n rollers 6 rotate around the circumferential direction of the screw rod 4 in a planetary mode and move axially relative to the screw rod 4, and the retainer 3 is driven to rotate around the screw rod 4 and move axially relative to the screw rod 4.
The tooth numbers and the teeth of the right gear ring 2 and the left gear ring 5 are arranged in the same way; the inner teeth of the right gear ring 2 and the outer teeth of the axial corresponding end of the roller 6 have the same rotating direction; the internal teeth of the left gear ring 5 and the external teeth of the axially corresponding end of the roller 6 have the same rotating direction; the nut 1 is driven by the roller 6 to synchronously rotate and move in a translation mode relative to the screw rod 4, and the nut 1 and the roller 6 do not move axially relative to each other. The nut 1 rotates around the screw rod 4 for one circle, and the nut 1 axially translates relative to the screw rod 4 by a lead distance.
The assembling process comprises the following steps:
the left gear ring 5 and the right gear ring 2 are connected through threads and are arranged on two sides of the nut 1, the gear teeth of the left gear ring and the right gear ring are in the same phase and coaxial through fine adjustment of the gear teeth of the 2 gear rings, and then the set screw 7 is arranged to limit the rotation of the gear rings; a retainer 3 is arranged from any side of the nut 1, and the retainer 3 is in sliding fit with gear rings on two sides; then sequentially loading n rollers 6 from inside to outside from the inner side of the retainer 3, ensuring that the rollers 6 are installed in place, and then coaxially and rotatably loading the screw rod 4; the screw 4 is thereafter checked for smoothness.
The roller 6 of the planetary roller screw pair does planetary motion and linear motion around the screw 4 under the constraint of the retainer 3 and the nut 1, no axial displacement exists between the roller 6 and the nut 1, the roller 6 rotates for a circle around the screw 4, and the nut 1 moves for a lead distance;
the planetary roller screw pair retainer 3 adopts an integrated structure and mainly comprises 2 annular frames 31 and 1 columnar frame 32, wherein the 2 annular frames 31 are coaxially arranged in an axial horizontal manner; the columnar frame 32 is coaxially arranged between the 2 annular frames 31; the columnar frame 32 is uniformly provided with n rectangular through holes 321 along the circumferential direction; each roller 6 is correspondingly embedded in 1 through hole 321; and allows the rollers 6 to move freely in the radial direction of the cage 3;
the length L of the through hole 321 in the retainer 3 is larger than the total length L1 of the roller 6, and the 2 annular frames 31 of the retainer 3 limit the axial position of the retainer 3; simultaneously, the retainer 3 can be ensured to rotate coaxially;
the inner diameter of the retainer 3 is larger than the maximum outer diameter of the screw rod 4, and the maximum outer diameter of the retainer 3 is smaller than the minimum inner diameter of the nut 1;
a right gear ring 2 and a left gear ring 5 of the planetary roller screw pair are fixedly connected with a nut respectively, and the relative rotation of the gear rings and the nut 1 is limited through a set screw 7. In the installation process, the phase angle relation of the gear rings at two ends is finely adjusted by adjusting the positions of the gear rings relative to the nut 1, so that the gear teeth of the left gear ring and the right gear ring have the same phase angle.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (10)
1. A planet roller screw pair is characterized in that: the device comprises a nut (1), a right gear ring (2), a retainer (3), a screw rod (4), a left gear ring (5), n rollers (6) and 2 locking screws (7); wherein the screw rod (4) is axially and horizontally arranged; the retainer (3) is sleeved on the outer wall of the screw rod (4); the n rollers (6) are uniformly embedded in the retainer (3) along the circumferential direction, the n rollers (6) are all arranged in parallel with the axis of the screw rod (4), and the n rollers (6) are all in threaded fit with the screw rod (4); the nut (1) is sleeved on the outer wall of the retainer (3); the left gear ring (5) and the right gear ring (2) are both arranged on the inner wall of the nut (1) and are sleeved on the outer walls of the n rollers (6); wherein, the left gear ring (5) is correspondingly arranged at the axial left end position of the roller (6); the right gear ring (2) is correspondingly arranged at the axial right end of the roller (6); the left gear ring (5) and the right gear ring (2) are fixedly connected with the nut (1) through 1 locking screw (7) respectively; n is a positive integer.
2. A planetary roller screw set according to claim 1, wherein: the retainer (3) comprises 2 annular frames (31) and 1 columnar frame (32); 2 annular frames (31) are coaxially arranged in an axial horizontal mode; the columnar frame (32) is coaxially arranged among the 2 annular frames (31); n rectangular through holes (321) are uniformly formed in the cylindrical frame (32) along the circumferential direction; each roller (6) is correspondingly embedded in 1 through hole (321).
3. A planetary roller screw set according to claim 2, wherein: the circumferential outer wall of the lead screw (4) is provided with threads; inner teeth are arranged on the inner walls of the right gear ring (2) and the left gear ring (5); outer teeth are arranged on the outer wall of the axial middle part and the outer walls of the axial two ends of the roller (6); wherein, the screw thread in the middle of the roller (6) is correspondingly matched with the screw thread of the screw rod (4); outer teeth at two axial ends of the roller (6) are respectively meshed and matched with inner teeth of the right gear ring (2) and the left gear ring (5).
4. A planetary roller screw set according to any one of claims 1 to 3, wherein: when the screw rod (4) rotates along the axial direction, the n rollers (6) are matched with the screw rod (4) through threads, the n rollers (6) are enabled to do planetary rotation around the circumferential direction of the screw rod (4) and do axial movement relative to the screw rod (4), and the retainer (3) is driven to rotate around the screw rod (4) and move axially relative to the screw rod (4).
5. A planetary roller screw set according to claim 4, wherein: the number of teeth and the number of teeth of the right gear ring (2) and the left gear ring (5) are the same; the inner teeth of the right gear ring (2) and the outer teeth of the axial corresponding end of the roller (6) have the same rotating direction; the internal teeth of the left gear ring (5) and the external teeth of the axial corresponding end of the roller (6) have the same rotating direction; the nut (1) is driven by the roller (6) to synchronously rotate and move in a translation mode relative to the screw rod (4), and the nut (1) and the roller (6) do not move axially relative to each other.
6. A planetary roller screw set according to claim 2, wherein: the width A of the rectangular through hole (321) is equal to the diameter B of the roller (6); and the retainer (3) does not limit the radial direction of the roller (6).
7. A planetary roller screw set according to claim 5, wherein: the nut (1) rotates for a circle around the lead screw (4), and the nut (1) axially translates for a lead distance relative to the lead screw (4).
8. A planetary roller screw set according to claim 2, wherein: the minimum inner diameter of the columnar frame (32) is larger than the maximum outer diameter of the screw rod (4); the maximum outer diameter of the columnar frame (32) is smaller than the minimum inner diameter of the nut (1); the 2 annular frames (31) are respectively in sliding fit with the right gear ring (2) and the left gear ring (5).
9. A planetary roller screw set according to claim 8, wherein: the length L of the rectangular through hole (321) is larger than the length L1 of the roller (6).
10. A planetary roller screw set according to claim 9, wherein: n is more than or equal to 9 and less than or equal to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010659139.2A CN111895062A (en) | 2020-07-09 | 2020-07-09 | Planetary roller screw pair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010659139.2A CN111895062A (en) | 2020-07-09 | 2020-07-09 | Planetary roller screw pair |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111895062A true CN111895062A (en) | 2020-11-06 |
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ID=73192174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010659139.2A Pending CN111895062A (en) | 2020-07-09 | 2020-07-09 | Planetary roller screw pair |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111895062A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101910660A (en) * | 2007-12-27 | 2010-12-08 | Ntn株式会社 | Roller bearing retainer, needle roller bearing, and method of producing roller bearing retainer |
| JP2012057751A (en) * | 2010-09-10 | 2012-03-22 | Ntn Corp | Retainer and needle roller bearing |
| CN102562986A (en) * | 2012-03-22 | 2012-07-11 | 上海久能机电制造有限公司 | Planetary roller screw |
| CN108266510A (en) * | 2018-03-21 | 2018-07-10 | 苏州阳林滚动机械科技有限公司 | A kind of circulating planetary roller screw of straight trough retainer |
| CN108518500A (en) * | 2018-05-03 | 2018-09-11 | 淄博沃泰斯石化设备有限公司 | A kind of retainer reset planet roller screws device |
| CN109854698A (en) * | 2019-01-16 | 2019-06-07 | 杭州新剑机器人技术股份有限公司 | Planetary roller screw pair transmission mechanism |
| JP2020003053A (en) * | 2018-07-02 | 2020-01-09 | Ntn株式会社 | Roller with holder and planetary gear support structure |
-
2020
- 2020-07-09 CN CN202010659139.2A patent/CN111895062A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101910660A (en) * | 2007-12-27 | 2010-12-08 | Ntn株式会社 | Roller bearing retainer, needle roller bearing, and method of producing roller bearing retainer |
| JP2012057751A (en) * | 2010-09-10 | 2012-03-22 | Ntn Corp | Retainer and needle roller bearing |
| CN102562986A (en) * | 2012-03-22 | 2012-07-11 | 上海久能机电制造有限公司 | Planetary roller screw |
| CN108266510A (en) * | 2018-03-21 | 2018-07-10 | 苏州阳林滚动机械科技有限公司 | A kind of circulating planetary roller screw of straight trough retainer |
| CN108518500A (en) * | 2018-05-03 | 2018-09-11 | 淄博沃泰斯石化设备有限公司 | A kind of retainer reset planet roller screws device |
| JP2020003053A (en) * | 2018-07-02 | 2020-01-09 | Ntn株式会社 | Roller with holder and planetary gear support structure |
| CN109854698A (en) * | 2019-01-16 | 2019-06-07 | 杭州新剑机器人技术股份有限公司 | Planetary roller screw pair transmission mechanism |
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Application publication date: 20201106 |
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| RJ01 | Rejection of invention patent application after publication |