CN114396465A - Compact planetary roller screw with circular ring friction transmission mode - Google Patents
Compact planetary roller screw with circular ring friction transmission mode Download PDFInfo
- Publication number
- CN114396465A CN114396465A CN202111568845.7A CN202111568845A CN114396465A CN 114396465 A CN114396465 A CN 114396465A CN 202111568845 A CN202111568845 A CN 202111568845A CN 114396465 A CN114396465 A CN 114396465A
- Authority
- CN
- China
- Prior art keywords
- screw
- roller
- thread
- screw rod
- planetary roller
- 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.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
Abstract
The invention relates to a compact planetary roller screw adopting a ring friction transmission mode, which comprises a screw rod, planet carriers, rollers, nuts and check rings, wherein the rollers are uniformly distributed on the periphery of the screw rod, the middle threads are meshed with the threads of the nuts and are in a non-meshed state with the screws, the rings at two ends of the rollers are meshed with the rings at two ends of the screw rod, shaft heads at two ends of the rollers are matched and connected with round holes uniformly distributed on the planet carriers at two sides, and the steel wire check rings are arranged in grooves of the screw rod and used for fixing the axial positions of the planet carriers. The invention designs the roller into middle threads of the circular rings at the two ends, designs the lead screw into a structure that the middle parts of the circular rings at the two ends do not participate in meshing, and realizes the constant lead of the planetary roller lead screw through the specific transmission ratio and the design of the structural parameters of the threads.
Description
Technical Field
The invention relates to a planetary roller screw, in particular to a planetary screw transmission mechanism for converting rotary motion into linear motion.
Background
Compared with a ball screw, the roller screw has the characteristics of stronger bearing capacity, higher speed, higher precision, longer service life, low maintenance cost and the like, thereby becoming one of the most critical basic parts in precision mechanical equipment such as aviation machinery, numerical control machines, precision instruments, meters and the like and being widely applied. The planetary roller screw comprises a screw rod, a nut and rollers, and also comprises parts such as an inner gear ring, a planet carrier, a check ring and the like. The planetary roller screw can be divided into three types, namely a standard type, a nut type and a circulating type according to the relative movement form among the rollers, the nut and the screw in the transmission process, wherein the standard type rollers and the nut are axially kept relatively static, the nut type rollers and the screw are axially kept relatively static, and the circulating type rollers move back and forth relative to the nut in an axial periodic mode. In the specific movement process, the roller threads are respectively meshed with the screw threads of the lead screw and the nut threads to transmit power. When the screw rod rotates, the nut moves along the axis of the screw rod, and the rollers rotate and do planetary motion around the screw rod at the same time, and the axial moving speed of the rollers is kept the same as that of the nut. The rotational motion is converted into a linear motion by the above-mentioned motion.
In the prior art, the middle section of the roller of the standard type and nut type planetary roller screw is in a thread structure, the two ends of the roller are in gear structures, and the threads of the roller are respectively meshed with the thread structures of the screw and the nut. The gear structure at the end of the roller shaft is meshed with an inner gear ring fixed on the nut. In the circulating planetary roller screw, the roller is of a pure circular ring structure, the nut is of a thread structure, and the defects of high noise and the like exist in the transmission process. In other forms of planetary roller screws, the rollers are in a circular ring structure, and the nut is also in a circular ring structure, but in the transmission process, the defect of uncertain lead exists in principle.
Disclosure of Invention
In order to optimize the structure and the transmission mode of the planetary roller screw and reduce the difficulty of the planetary roller screw in processing, manufacturing and assembling, the invention provides a compact planetary roller screw in a circular friction transmission mode, and the planetary roller screw has a constant lead. According to the planetary roller screw, the thread processing of the screw is cancelled, the ring teeth are processed only on two sides of one end to bear axial load, the threads on the roller are only meshed with the screw, the assembly difficulty is greatly reduced, the assembly convenience is improved, and the assembly problem caused by thread phase and gear phase is avoided.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a compact planet roller lead screw of ring friction drive mode, includes lead screw, planet carrier, roller, nut, retaining ring, the roller distributes uniformly around the lead screw, and middle screw thread meshes with the screw thread of nut mutually, and is in the non-meshing state with the silk, the ring at roller both ends meshes with the ring at lead screw both ends mutually, evenly distributed's round hole matches and is connected on the spindle nose at roller both ends and the planet carrier of both sides, the steel wire retaining ring is installed within the slot of lead screw for the axial position of planet carrier is fixed.
Furthermore, the roller structure is a middle symmetrical structure, and the middle of the roller structure is provided with a thread, a circular ring and an optical axis in sequence from the middle to the outside.
Further, the screw thread in the middle of the roller is a single-head screw thread or a multi-head screw thread, and the screw pitch of the screw thread is the same as that of the screw thread of the screw rod.
Furthermore, the outer side of the thread is of a circular ring structure, and the outer diameter of the circular ring is smaller than the bottom diameter of the thread and is used for bearing axial force and partial radial force.
Furthermore, the outermost sides of the two ends of the roller are optical axis structures and are used for installing the planet carrier.
Furthermore, the screw rod is axially arranged on one side of the screw rod and is of a transmission structure, and the screw rod is arranged on the other side of the screw rod and is of a push rod structure.
Further, the transmission structure of the lead screw is respectively from right to left and is respectively from right to left: the optical axis a is used for installing a groove b of the steel wire clamp spring, the planet carrier is provided with an optical axis c, a circular ring structure d, an optical axis e, a circular ring structure f, the planet carrier is provided with an optical axis g, the groove h for installing the steel wire clamp spring is of a step structure, and the end of a lead screw shaft is i.
Further, the outer diameter of the optical axis e is lower than the bottom diameters of the circular ring structures d and f.
Furthermore, the transmission structure of the lead screw is connected with the push rod structure through a connecting structure, the connecting structure comprises a hollow structure arranged in the transmission structure, and the push rod structure penetrates through the hollow structure and then is fixedly connected with the transmission structure through a fastener.
Furthermore, the inner wall of the nut is of a multi-thread structure, and the external interface has various forms.
The invention has the beneficial effects that:
the invention provides a novel planetary roller screw adopting a circular ring friction transmission mode, wherein a roller is designed into a middle thread of circular rings at two ends, the screw is designed into a structure that the middle parts of the circular rings at the two ends do not participate in meshing, and the constant lead of the planetary roller screw is realized through specific transmission ratio and thread structure parameter design. The planetary roller screw obtained by the invention has great advantages in the aspects of processing, manufacturing, assembling and the like, and the difficulty in the production process is reduced. The processing and manufacturing processes of the screw threads of the lead screw are reduced, and the problems of meshing quality and the like caused by meshing of a plurality of threads are solved. To a certain extent, the number of corresponding contact points is reduced, and the transmission efficiency can be theoretically improved.
Drawings
FIG. 1 is a general view of a compact planetary roller screw arrangement of the present invention in an annular friction drive mode;
FIG. 2 is a schematic view of a roller and screw mating connection;
FIG. 3 is a perspective view of a roller arrangement;
FIG. 4 is a schematic plan view of a roller arrangement;
FIG. 5 is a schematic view of a nut construction;
FIG. 6 is a perspective view of the lead screw;
FIG. 7 is a schematic plan view of a lead screw configuration;
FIG. 8 is a schematic view of an embodiment of a lead screw;
fig. 9 is a schematic view of the mating connection between the roller threads and the nut threads, and the roller ring and the screw ring.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1 and 2, the planetary roller screw of the ring friction transmission system of the present invention includes a screw 1, a retainer ring 2, rollers 3, a nut 4, a carrier 5, and the like. The rollers 3 are uniformly distributed around the screw rod 1, the middle threads are meshed with the threads of the nuts 4 and are not meshed with the screw rod, the circular rings at the two ends of the rollers 3 are meshed with the circular rings at the two ends of the screw rod 1, the shaft heads at the two ends are matched with the circular holes uniformly distributed on the planet carrier 5, mutual collision friction between the rollers is avoided, and the stress state is improved. The optical axis installation position in two planet carrier installation lead screw gear structure outsides about, the steel wire retaining ring is installed within the slot of lead screw, and mainly used planet carrier's axial position is fixed.
As shown in figures 3 and 4, the roller structure comprises a thread 3-1, a circular ring 3-2 and an optical axis 3-3 from the middle to the outside. The middle of the roller 3 is of a thread structure, the thread is generally a single-head thread or a multi-head thread, and the thread pitch of the thread is the same as that of the thread of the screw rod 1; the outer side of the thread is of a circular ring structure, the outer diameter of the circular ring is generally smaller than the bottom diameter of the thread, and the circular ring is mainly used for bearing axial force and partial possible radial force; the outermost sides of the two ends of the roller are in optical axis structures and are mainly used for mounting the planet carrier.
The roller threads are meshed with the nut threads in the specific movement process, the rotation of the roller is driven through the rotation of the nut/lead screw, the roller ring is meshed with the lead screw ring, and the planetary movement of the roller is enabled to accord with a specific rule through friction transmission so as to meet the constant guide distance condition. Meanwhile, the roller ring is meshed with the ring of the screw rod to bear corresponding axial force. Finally, when the nut/screw rotates, the screw/nut moves along the axis of the screw, the rollers spin while making a planetary motion around the screw, while maintaining the same axial movement speed as the screw, the rollers and the screw remain relatively axially stationary. The rotational motion is converted into a linear motion by the above-mentioned motion.
As shown in figures 6 and 7, the screw rod 1 mainly has two structures in the axial direction, namely a transmission structure 1-1 positioned on one side of the screw rod 1 and a push rod structure 1-2 positioned on the other side, and the structures can be in various complex interface forms and are connected with other structures. Possess the one side structure of ring, do from right side to left respectively: the optical axis a is used for installing a groove b of the steel wire clamp spring, the planet carrier is provided with an optical axis c, a circular ring structure d, an optical axis e, a circular ring structure f, the planet carrier is provided with an optical axis g, the groove h for installing the steel wire clamp spring is of a step structure, and the end of a lead screw shaft is i.
The screw rod push rod structure can be designed into any structure and length in the practical application process, and the thread of the screw rod is a multi-start thread. In order to achieve a constant lead of the planetary roller screw, the nominal diameter and the number of the heads of the nut threads and the nominal diameters of the roller threads and the circular rings should satisfy a specific relationship.
As shown in FIG. 5, the inner wall of the nut 4 has a multi-start thread structure, and the external interface can have various forms.
As shown in fig. 8, in the specific implementation, the screw may be composed of a transmission part and a push rod part, which may be connected in a certain form, so as to achieve a certain effect. When the screw rod is specifically implemented, the transmission part of the screw rod can be of a hollow structure, and the push rod part penetrates through the middle hole structure and then is fixed with the transmission structure in a nut or other forms.
When the friction transmission device is specifically implemented, the pretightening force can be realized by controlling the cooperation between the roller threads and the nut threads and between the roller ring and the screw rod ring, so that the smooth operation of the friction transmission is ensured. In a specific embodiment, the thread thickness and the ring thickness are controlled to realize the interference fit A when the threads are embedded into each other, which is shown in figure 9.
Claims (10)
1. The utility model provides a compact planet roller lead screw of ring friction drive mode, includes lead screw, planet carrier, roller, nut, retaining ring, its characterized in that: the roller is uniformly distributed around the screw rod, the middle thread is meshed with the thread of the nut and is in a non-meshed state with the screw rod, the circular rings at the two ends of the roller are meshed with the circular rings at the two ends of the screw rod, the shaft heads at the two ends of the roller are matched and connected with the circular holes uniformly distributed on the planet carriers at the two sides, and the steel wire check ring is arranged in the groove of the screw rod and used for fixing the axial position of the planet carrier.
2. The toroidal friction drive compact planetary roller screw of claim 1, wherein: the roller structure is a middle symmetrical structure, and is provided with a thread, a circular ring and an optical axis from the middle to the outside in sequence.
3. The toroidal friction drive compact planetary roller screw of claim 1, wherein: the middle thread of the roller is a single-head thread or a multi-head thread, and the thread pitch of the thread is the same as that of the screw rod.
4. The toroidal friction drive compact planetary roller screw of claim 1, wherein: the outer side of the thread is of a circular ring structure, and the outer diameter of the circular ring is smaller than the bottom diameter of the thread and is used for bearing axial force and partial radial force.
5. The toroidal friction drive compact planetary roller screw of claim 1, wherein: and the outermost sides of the two ends of the roller are optical axis structures for mounting the planet carrier.
6. The toroidal friction drive compact planetary roller screw of claim 1, wherein: the screw rod is axially arranged on one side of the screw rod and is of a transmission structure, and the screw rod is arranged on the other side of the screw rod and is of a push rod structure.
7. The toroidal friction drive compact planetary roller screw of claim 6, wherein: the transmission structure of lead screw is from right side to left side and is respectively for being optical axis a from right side to left side for recess b of installation steel wire jump ring, planet carrier installation optical axis c, ring structure d, optical axis e, ring structure f, planet carrier installation optical axis g, the recess h of installation steel wire jump ring perhaps is step structure, lead screw axle end i.
8. The toroidal friction drive compact planetary roller screw of claim 7, wherein: the outer diameter of the optical axis e is lower than the bottom diameters of the circular ring structures d and f.
9. The toroidal friction drive compact planetary roller screw of claim 6, wherein: the transmission structure of the lead screw is connected with the push rod structure through a connecting structure, the connecting structure comprises a hollow structure arranged in the transmission structure, and the push rod structure penetrates through the hollow structure and then is fixedly connected with the transmission structure through a fastener.
10. The toroidal friction drive compact planetary roller screw of claim 1, wherein: the inner wall of the nut is of a multi-thread structure, and the external interface has various forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111568845.7A CN114396465A (en) | 2021-12-21 | 2021-12-21 | Compact planetary roller screw with circular ring friction transmission mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111568845.7A CN114396465A (en) | 2021-12-21 | 2021-12-21 | Compact planetary roller screw with circular ring friction transmission mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114396465A true CN114396465A (en) | 2022-04-26 |
Family
ID=81226193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111568845.7A Pending CN114396465A (en) | 2021-12-21 | 2021-12-21 | Compact planetary roller screw with circular ring friction transmission mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114396465A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012224032A1 (en) * | 2012-12-20 | 2014-06-26 | Ifm Electronic Gmbh | Electronic selector switch controlled pulse charge transfer device installed in motor vehicle, has load capacitor to which higher measurement signal is output with less interference, such that discharging of load capacitor is adjusted |
| CN203809629U (en) * | 2014-05-08 | 2014-09-03 | 黄溧震 | Planetary roller screw |
| CN104675946A (en) * | 2014-08-27 | 2015-06-03 | 北京精密机电控制设备研究所 | Differential planetary roller screw |
| US9509144B1 (en) * | 2011-11-19 | 2016-11-29 | Lex Products | Universal powering station and a method for implementing same |
| CN111853191A (en) * | 2020-08-11 | 2020-10-30 | 黄溧震 | Nut type gearless constant lead planetary roller screw |
-
2021
- 2021-12-21 CN CN202111568845.7A patent/CN114396465A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9509144B1 (en) * | 2011-11-19 | 2016-11-29 | Lex Products | Universal powering station and a method for implementing same |
| DE102012224032A1 (en) * | 2012-12-20 | 2014-06-26 | Ifm Electronic Gmbh | Electronic selector switch controlled pulse charge transfer device installed in motor vehicle, has load capacitor to which higher measurement signal is output with less interference, such that discharging of load capacitor is adjusted |
| CN203809629U (en) * | 2014-05-08 | 2014-09-03 | 黄溧震 | Planetary roller screw |
| CN104675946A (en) * | 2014-08-27 | 2015-06-03 | 北京精密机电控制设备研究所 | Differential planetary roller screw |
| CN111853191A (en) * | 2020-08-11 | 2020-10-30 | 黄溧震 | Nut type gearless constant lead planetary roller screw |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112049908A (en) | Planetary roller screw of gear transmission mode | |
| CN103089956B (en) | A kind of roller screw drive linear actuator | |
| CN110107664B (en) | Reverse type planet roller screw rod of nut with large length-diameter ratio | |
| US20090293659A1 (en) | Wave-gear-type linear-actuation mechanism | |
| CN102562986A (en) | Planetary roller screw | |
| CN112049907A (en) | Ring gear nut planet roller screw | |
| CN111779810B (en) | Planetary roller screw | |
| CN109854698A (en) | Planetary roller screw pair transmission mechanism | |
| CN102705465A (en) | Novel planet pin roller screw assembly | |
| CN112413076A (en) | Differential planetary roller screw pair | |
| CN114321312A (en) | Differential planetary roller screw pair, assembly tool and assembly process | |
| CN212536573U (en) | Planetary roller screw of gear transmission mode | |
| CN212536572U (en) | Ring gear nut planet roller screw | |
| CN114396465A (en) | Compact planetary roller screw with circular ring friction transmission mode | |
| CN205350242U (en) | No return difference single -stage cycloid awl tooth reduction gear | |
| WO2012010042A1 (en) | Rudder-shaped roller gear and arched-surface-enveloped gear engaged drive structure | |
| CN114215893A (en) | Compact planetary roller screw of gear transmission mode | |
| CN111853191A (en) | Nut type gearless constant lead planetary roller screw | |
| CN213655628U (en) | Planetary roller screw with novel roller structure | |
| CN202100673U (en) | Planetary roller lead screw | |
| CN112935155B (en) | Steel wire braider | |
| KR20050061528A (en) | Speed changing apparatus | |
| CN202100672U (en) | Planetary roller lead screw | |
| CN111457070A (en) | Planetary roller screw with cycloidal thread profile | |
| CN111457071A (en) | Planetary roller screw with involute thread profile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |