CN212536573U - Planetary roller screw of gear transmission mode - Google Patents
Planetary roller screw of gear transmission mode Download PDFInfo
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- CN212536573U CN212536573U CN202022064795.6U CN202022064795U CN212536573U CN 212536573 U CN212536573 U CN 212536573U CN 202022064795 U CN202022064795 U CN 202022064795U CN 212536573 U CN212536573 U CN 212536573U
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Abstract
The utility model relates to a gear drive's planet roller lead screw, outwards be screw thread, ring tooth, gear and optical axis in proper order in the middle of the roller, the nut hole mainly has three kinds of structures in the axial: the nut comprises inner gear ring mounting structures positioned at two ends of the nut, ring gear structures symmetrically distributed at two ends of the nut and avoidance step holes in the middle section of the nut; the rollers are uniformly distributed around the screw rod, the middle threads are meshed with the threads of the screw rod but not meshed with the nut, the ring teeth at two ends of the rollers are meshed with the ring teeth at two ends of the nut, the outer side gear is meshed with the gear of the inner gear ring mounted in the inner gear ring mounting structure of the nut, and the optical axes at two ends are matched with the round holes uniformly distributed on the planet carrier. The planetary roller screw has a constant lead, the thread processing of the nut is cancelled, only the annular teeth processed at the two ends of the nut bear axial load, the gears at the two ends of the roller ensure the transmission ratio of the roller and the nut, and the lead uncertainty caused by the mutual sliding of the roller and the nut is avoided.
Description
Technical Field
The utility model relates to a turn into linear motion's planetary screw drive mechanism with rotary motion, especially a planetary roller lead screw for heavy load high speed drive.
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 axial direction of the screw rod, the roller rotates and performs planetary motion around the screw rod, and meanwhile the axial moving speed of the roller 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 ring gear 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 ring tooth structure, and the nut is also in a ring tooth pure 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 planet roller lead screw, reduce the degree of difficulty of planet roller lead screw in processing, manufacturing and assembly, the utility model provides a gear drive's planet roller lead screw, this planet roller lead screw has invariable helical pitch, and cancelled the thread machining of nut, only the both ends processing ring tooth at the nut bears axial load, the gear at roller both ends has guaranteed the drive ratio of roller with the nut, it is uncertain to have avoided the two mutual slip and the helical pitch that leads to, screw on the roller only meshes with the lead screw mutually, the degree of difficulty of assembly has been reduced by a wide margin, increase the convenience of assembly, the assembly problem of having avoided leading to because screw phase place and gear phase place. The thread engagement only exists between the screw rod and the roller, and the circular ring engagement only exists between the nut and the roller, so the freedom degree of parameter design is greatly increased in the design process of thread parameters and related structural parameters.
In order to achieve the above purpose, the technical scheme of the utility model is that: the utility model provides a planetary roller lead screw of gear drive mode, includes lead screw, nut, roller, ring gear, fixed pin axle, planet carrier, retaining ring, outwards be screw thread, ring gear, gear and optical axis in proper order in the middle of the roller, the nut hole mainly has three kinds of structures in the axial: the nut comprises inner gear ring mounting structures positioned at two ends of the nut, ring gear structures symmetrically distributed at two ends of the nut and avoidance step holes in the middle section of the nut; the rollers are uniformly distributed around the screw rod, the middle threads are meshed with the threads of the screw rod but not meshed with the nut, the ring teeth at two ends of the rollers are meshed with the ring teeth at two ends of the nut, the outer side gear is meshed with the gear of the inner gear ring mounted in the inner gear ring mounting structure of the nut, and the optical axes at two ends are matched with the round holes uniformly distributed on the planet carrier.
Further, the inner gear ring is mounted in the inner gear ring mounting structure of the nut and is axially fixed by a fixing shaft pin 5.
Furthermore, the left planet carrier and the right planet carrier are arranged at the installation positions of the inner gear ring, and the check ring is arranged in the groove of the inner gear ring 4 and used for fixing the axial position of the planet carriers.
Furthermore, the thread of the roller is a single-head thread, and the thread pitch of the thread is the same as that of the screw thread of the lead screw.
Further, the outer diameter of the ring teeth of the roller is smaller than the bottom diameter of the thread, so that the roller is prevented from interfering with the thread of the screw and is used for bearing axial force and part of possible radial force.
Further, the diameter ratio of the ring teeth of the rollers to the ring teeth of the nut is the same as the ratio of the number of the teeth of the rollers to the number of the teeth of the inner gear ring on the nut.
Furthermore, the screw thread of the lead screw is a multi-start screw thread.
Further, when the screw rod rotates, the nut moves along the axis of the screw rod, the roller rotates and simultaneously performs planetary motion around the screw rod, the axial moving speed same as that of the nut is kept, and the rotary motion is converted into linear motion.
Furthermore, the planetary roller screw in the gear transmission mode is also provided with a pre-tightening structure, and the pre-tightening structure is a locking pre-tightening structure or an elastic disc spring pre-tightening structure.
Furthermore, the locking pre-tightening structure is composed of an adjusting gasket and a locking screw nut, the adjusting gasket is arranged between the two half nuts, the two half nuts are connected through the locking screw nut, and pre-tightening force is applied to the planetary roller screw through the locking screw nut, so that the ring gear contact part is more compact, the transmission gap is reduced, and the transmission stability is ensured.
The utility model has the advantages that:
the utility model provides a novel drive mode's planet roller lead screw designs gear, ring gear and helicitic texture on the roller, and the nut design is hollow structure in the middle of the ring gear of both ends, and the roller screw only contacts with lead screw thread, and the roller screw thread does not contact with the nut, and the ring gear and the gear through the roller both ends form the planetary motion of roller, and this kind of planetary motion has obvious difference with planet roller lead screw in the past. Under the transmission mode, the constant lead of the planetary roller screw is realized through the specific transmission ratio and the thread parameter design. Through the utility model discloses a planet roller lead screw that obtains has very big advantage in the aspect of processing, manufacturing, assembly etc. has reduced the degree of difficulty in process of production.
Drawings
FIG. 1 is a perspective view of a planetary roller screw assembly in a geared fashion;
FIG. 2 is a perspective view of a roller arrangement;
FIG. 3 is a schematic plan view of a roller arrangement;
FIG. 4 is a perspective view of the nut structure;
FIG. 5 is a perspective view of the lead screw;
fig. 6 is a perspective view of a preloaded planetary roller screw assembly.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
As shown in fig. 1, a planetary roller screw with a gear transmission mode comprises a screw 1, a nut 2, rollers 3, an inner gear ring 4, a fixed pin shaft 5, a planet carrier 6, a retainer ring 7 and other parts.
As shown in figures 2 and 3, the middle of the roller 3 is provided with a thread 3-1, a ring gear 3-2, a gear 3-3 and an optical axis 3-4 in sequence outwards. The middle of the roller 3 is of a thread structure, the thread is generally a single-end 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 ring gear structure, the outer diameter of the ring gear 3-2 is generally smaller than the bottom diameter of the thread 3-1, interference with the thread of the screw rod is avoided, the ring gear is mainly used for bearing axial force and partial possible radial force, and in order to prevent mutual sliding of the ring gear 3-2 of the roller 3 and the ring gear of the nut, the diameter ratio of the ring gear and the ring gear is generally the same as the ratio of the number of teeth of the roller 3 to the number of teeth of the inner gear ring 4 on the nut 2; the outer side of the ring gear 3-2 is of a gear structure, and the transmission ratio of the gear 3-3 needs to be specially designed to meet the requirement of constant lead; the outermost sides of the two ends of the roller 3 are in optical axis structures and are mainly used for mounting the planet carrier.
As shown in fig. 4, the inner bore of the nut 2 has three main structures in the axial direction: the nut comprises annular gear mounting structures 2-1 positioned at two ends of a nut 2, annular gear structures 2-2 symmetrically distributed at two ends of the nut, and avoidance step holes 2-3 in the middle section of the nut.
As shown in fig. 5, the shaft end of the screw rod 1 can be designed into any structure in the practical application process, and the thread of the screw rod 1 is a multi-start thread. In order to achieve a constant lead of the planetary roller screw, a certain relationship should be satisfied between the nominal diameter of the thread of the screw 1, the number of the heads, the thread of the roller, the number of teeth and the number of teeth of the inner gear ring.
As shown in figure 1, the rollers 3 are uniformly distributed around the screw rod 1, the middle thread is meshed with the thread of the screw rod 1 but not meshed with the nut, the ring teeth 3-2 at the two ends of the rollers 3 are meshed with the ring teeth at the two ends of the nut 2, the outer side gear 3-3 is meshed with the gear of the ring gear 4 arranged in the ring gear mounting structure 2-1 of the nut 2, and the optical axes 3-4 at the two ends are matched with the round holes uniformly distributed on the planet carrier 6, so that mutual collision and friction among the rollers are avoided, and the stress state is improved. The inner gear ring 4 is arranged in the mounting position of the nut 2 and is axially fixed by adopting a fixing shaft pin 5, the left planet carrier 6 and the right planet carrier 6 are provided with the mounting position of the inner gear ring 4, and the retainer ring 7 is arranged in a groove of the inner gear ring 4 and is mainly used for fixing the axial position of the planet carrier 6.
In the specific movement process, the thread of the roller is meshed with the thread of the screw rod, the roller is driven to rotate by the rotation of the screw rod, the roller gear is meshed with the inner gear ring, so that the planetary movement of the roller meets a specific rule to meet a constant guide distance condition, and the annular teeth of the roller are meshed with the annular teeth of the nut to bear corresponding axial force. Finally, when the screw rotates, the nut moves along the axis of the screw, and the rollers rotate while making planetary motion around the screw, while maintaining the same axial movement speed as the nut. The rotational motion is converted into a linear motion by the above-mentioned motion.
Besides the above structural forms, the planetary roller screw can also be designed to have a pre-tightening structural form in the practical application process, and the pre-tightening structural form can reduce the possibility of the planetary roller screw to slide on the whole. As shown in fig. 6, the novel planetary roller screw with the pre-tightening structure comprises parts such as a screw 1, a nut 2, a roller 3, a planet carrier 6, a retainer ring 7 and the like, and also comprises parts such as an adjusting gasket 8, a locking screw nut 9 and the like. A certain pretightening force can be applied to the planetary roller screw through the adjusting gasket 8 and the locking screw nut 9, so that the contact part of the ring gear is more compact, the transmission gap is reduced, and the transmission stability is ensured. Besides the pre-tightening structure, the elastic disk spring pre-tightening structure can also be used.
Claims (10)
1. The utility model provides a planetary roller lead screw of gear drive mode, includes lead screw, nut, roller, ring gear, fixed pin axle, planet carrier, retaining ring, its characterized in that: the middle of the roller is outward provided with a thread, a ring gear, a gear and an optical axis in sequence, and the inner hole of the nut mainly has three structures in the axial direction: the nut comprises inner gear ring mounting structures positioned at two ends of the nut, ring gear structures symmetrically distributed at two ends of the nut and avoidance step holes in the middle section of the nut; the rollers are uniformly distributed around the screw rod, the middle threads are meshed with the threads of the screw rod but not meshed with the nut, the ring teeth at two ends of the rollers are meshed with the ring teeth at two ends of the nut, the outer side gear is meshed with the gear of the inner gear ring mounted in the inner gear ring mounting structure of the nut, and the optical axes at two ends are matched with the round holes uniformly distributed on the planet carrier.
2. The geared planetary roller screw of claim 1, wherein: the inner gear ring is arranged in the inner gear ring mounting structure of the nut and is axially fixed by a fixing shaft pin 5.
3. The geared planetary roller screw of claim 1, wherein: the left planet carrier and the right planet carrier are arranged at the installation positions of the inner gear ring, and the check ring is arranged in the groove of the inner gear ring 4 and used for fixing the axial position of the planet carriers.
4. The geared planetary roller screw of claim 1, wherein: the thread of the roller is a single-head thread, and the thread pitch of the thread is the same as that of the screw thread of the lead screw.
5. The geared planetary roller screw of claim 1, wherein: the outer diameter of the ring teeth of the roller is smaller than the bottom diameter of the thread, so that the roller is prevented from interfering with the thread of the screw and is used for bearing axial force and part of possible radial force.
6. The geared planetary roller screw of claim 1, wherein: the diameter ratio of the ring teeth of the rollers to the ring teeth of the nut is the same as the ratio of the number of teeth of the rollers to the number of teeth of the inner gear ring on the nut.
7. The geared planetary roller screw of claim 1, wherein: the screw thread of the lead screw is a multi-start thread.
8. The geared planetary roller screw of claim 1, wherein: when the screw rod rotates, the nut moves along the axis of the screw rod, the rollers rotate and do planetary motion around the screw rod, the axial moving speed same as that of the nut is kept, and the rotary motion is converted into linear motion.
9. The geared planetary roller screw of claim 1, wherein: the planetary roller screw in the gear transmission mode is also provided with a pre-tightening structure, and the pre-tightening structure is a locking pre-tightening structure or an elastic disc spring pre-tightening structure.
10. The geared planetary roller screw of claim 9, wherein: the locking pre-tightening structure is composed of an adjusting gasket and a locking screw nut, the adjusting gasket is arranged between the two half nuts, the two half nuts are connected through the locking screw nut, and pre-tightening force is applied to the planetary roller screw through the locking screw nut, so that the ring gear contact part is more compact, the transmission gap is reduced, and the transmission stability is ensured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022064795.6U CN212536573U (en) | 2020-09-18 | 2020-09-18 | Planetary roller screw of gear transmission mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022064795.6U CN212536573U (en) | 2020-09-18 | 2020-09-18 | Planetary roller screw of gear transmission mode |
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| Publication Number | Publication Date |
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| CN212536573U true CN212536573U (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022064795.6U Active CN212536573U (en) | 2020-09-18 | 2020-09-18 | Planetary roller screw of gear transmission mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114233829A (en) * | 2021-12-24 | 2022-03-25 | 北京精密机电控制设备研究所 | Differential reverse type planetary roller screw pair |
-
2020
- 2020-09-18 CN CN202022064795.6U patent/CN212536573U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114233829A (en) * | 2021-12-24 | 2022-03-25 | 北京精密机电控制设备研究所 | Differential reverse type planetary roller screw pair |
| CN114233829B (en) * | 2021-12-24 | 2023-09-29 | 北京精密机电控制设备研究所 | Differential reverse planetary roller screw pair |
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