CN110798048A - Transmission mechanism for spaceflight - Google Patents
Transmission mechanism for spaceflight Download PDFInfo
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- CN110798048A CN110798048A CN201910940810.8A CN201910940810A CN110798048A CN 110798048 A CN110798048 A CN 110798048A CN 201910940810 A CN201910940810 A CN 201910940810A CN 110798048 A CN110798048 A CN 110798048A
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- permanent magnet
- gear
- ball screw
- planet
- planetary gear
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
- H02K49/102—Magnetic gearings, i.e. assembly of gears, linear or rotary, by which motion is magnetically transferred without physical contact
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Abstract
The invention relates to a transmission mechanism for spaceflight, which comprises a planetary gear set and a ball screw pair, wherein the ball screw pair is connected with the planetary gear set, the planetary gear set and the ball screw pair are linearly arranged, the planetary gear set comprises a sun gear, a planet gear, an inner gear ring and permanent magnets, the sun gear and the inner gear ring are coaxially arranged, the permanent magnets comprise a first permanent magnet, a second permanent magnet and a third permanent magnet, the outer surface of the sun gear is provided with the first permanent magnet, the outer surface of the planet gear is provided with the second permanent magnet, the inner surface of the inner gear ring is provided with the third permanent magnet, and the permanent magnets comprise at least one magnetic pole pair; the ball screw pair comprises a roller screw, a nut and a flat key. The transmission mechanism provided by the invention transmits torque through magnetic pull force of multi-magnetic field coupling, and realizes the volume miniaturization and the weight reduction of the transmission mechanism.
Description
Technical Field
The invention belongs to the technical field of transmission mechanisms, and particularly relates to a transmission mechanism for spaceflight.
Background
The transmission mechanism is used as a link for connecting a power system and a working mechanism and is widely applied to various types of aerospace vehicles. As a basic core component of major aerospace equipment, the performance of aerospace transmission mechanisms in China still has a large gap compared with foreign products, and a technical bottleneck for restricting development still exists.
According to different types of transmission mechanisms, the current aerospace precise transmission mechanism comprises a lead screw transmission mechanism, a gear transmission mechanism and the like, the mechanical gear transmission mechanism is widely applied to various social fields by the advantages of stable transmission ratio, large transmittable torque and the like, the vibration and noise in the transmission of mechanical straight teeth and helical bevel gears are large due to processing and installation errors, and the spiral bevel gears have high transmission precision but high processing cost and high price. And the mechanical bevel gear transfers torque by means of the engagement between teeth, which brings about irreparable problems to gear transmission, such as mechanical fatigue, friction loss, lubrication pollution, large vibration and noise, and the like.
Disclosure of Invention
The present invention is directed to solve the problems of the background art, and an object of the present invention is to provide a transmission mechanism for aerospace that transmits torque by magnetic pulling force of multi-magnetic field coupling, and that achieves a reduction in size and weight of the transmission mechanism.
The purpose of the invention is realized as follows:
a transmission mechanism for spaceflight comprises a planetary gear set and a ball screw pair, wherein the ball screw pair is connected with the planetary gear set, the planetary gear set and the ball screw pair are arranged in a linear mode, the planetary gear set comprises a sun gear, a planet gear, an inner gear ring and permanent magnets, the sun gear and the inner gear ring are arranged in a coaxial mode, the permanent magnets comprise a first permanent magnet, a second permanent magnet and a third permanent magnet, the first permanent magnet is arranged on the outer surface of the sun gear, the second permanent magnet is arranged on the outer surface of the planet gear, the third permanent magnet is arranged on the inner surface of the inner gear ring, and the permanent magnets comprise at least one magnetic pole pair;
the ball screw pair comprises a roller screw, a nut and a flat key, one end of the roller screw is connected with the planetary gear set, the nut is sleeved on the ball screw, and the flat key is arranged on the nut.
Furthermore, the planetary gear set and the ball screw pair are arranged in the coaxial direction.
Furthermore, the sun wheel and the planet wheel are in an external meshing structure, and the rotating directions of the external meshing gears of the sun wheel and the planet wheel are opposite.
Furthermore, the planet wheel and the inner gear ring are of an inner meshing gear structure, and the inner meshing rotating directions of the planet wheel and the inner gear ring are the same.
Furthermore, the magnetic pole pair of permanent magnet is formed by N level magnetic sheet and the even interval setting of S level magnetic sheet, the permanent magnet adopts neodymium iron boron permanent magnet material.
Furthermore, the first permanent magnet, the second permanent magnet and the third permanent magnet are all magnetized in the radial direction.
Furthermore, the nut is a combined double nut without an axial gap and composed of two nuts.
Further, the ball screw adopts a triangular thread with a right-angled thread profile, at least 3 heads are arranged on the thread, and the nut adopts a thread with the same thread profile as the inner thread of the ball screw.
Furthermore, the planet wheel is connected with the planet carrier, and the sun wheel, the planet carrier and the internal gear are arranged coaxially.
Further, the sun gear radius R1Radius R of planet wheel2And ring gear radius R3Satisfies the following conditions: r1+2R2＝R3。
Further, the sun wheel has magnetic pole pair numberP1Planet wheel magnetic pole pair number P2And the number of pole pairs P of the inner gear ring3Satisfies the following conditions: p1+2P2＝P3。
Further, the radius of the planet carrier satisfies: r4＝(R3+R1)/2。
Further, the number of the planet wheels satisfies:
wherein
And a, b belongs to N, and N is more than or equal to 1 and less than or equal to 4.
Further, the sun wheel angular velocity ω1Angular velocity omega of planet carrier4And annular gear angular velocity ω3Satisfies the following conditions:
further, the angular velocity ω of the ball screwGSatisfies the following conditions:
wherein d is1Diameter of the screw, d2Is the nut diameter.
Compared with the prior art, the invention has the beneficial effects that:
1. the transmission mechanism for spaceflight provided by the invention realizes the motion and energy transmission between the input gear and the output gear by utilizing the magnetic field coupling between the permanent magnets, is clean and environment-friendly because of no contact, no friction and lubrication, and adopts the combination of two modes of external engagement with large transmission moment fluctuation, low torque density and small moment fluctuation and internal engagement with large transmission moment, and carries out the moment transmission by the magnetic pull force generated by the magnetic coupling of the planet wheel, the permanent magnet sun wheel and the permanent magnet gear ring.
2. The invention provides a transmission mechanism for spaceflight, wherein a sun gear, a planet gear and an inner gear ring are arranged in a concentric structure, the transmission of power is realized through the magnetic field modulation action of different magnetic gears, when the sun gear is used as an input part and the inner gear ring is used as an output part, as the rotating speed of the sun gear is continuously improved, the magnetic fields of the sun gear and the planet gears deviate from the magnetic force balance position, the planet gears are accelerated under the magnetic field modulation of the sun gear, as the rotating speed of the planet gears is continuously improved, the magnetic fields of the planet gears and the inner gear ring deviate from the magnetic force balance position, the inner gear ring is accelerated under the magnetic field modulation of the planet gears until the sun gear, the planet gears and the inner gear ring are in the magnetic force balance position again, at the moment, the permanent magnet gear of the planetary gear train keeps, when other gears are used as input members or output members, the working principle of the planetary gear train is the same.
3. According to the transmission mechanism for spaceflight, the planetary gear set and the ball screw pair are combined, the planetary gear set is driven by the motor and is equivalent to the reducer of the ball screw pair, so that the screw can run more stably, different transmission ratios of the ball screw pair are realized, the ball screw has strong bearing capacity and service life, higher rotating speed and angular acceleration are realized, the transmission mechanism is suitable for various conditions, and the size miniaturization and the weight lightening of the transmission mechanism are realized.
4. The transmission mechanism for spaceflight provided by the invention has the advantages that the flat key is used for connecting a transmitted object, the structure is simple, the disassembly and the assembly are convenient, the centering performance is good, and the transmission mechanism is suitable for occasions with high speed, variable load and impact resistance.
5. According to the transmission mechanism for spaceflight, the effectiveness of magnetic coupling of all parts in the gear set is ensured by setting the magnetic pole pair and the angular speed of the planetary gear set, all permanent magnets participate in torque transmission at the same time, and the torque density is effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of a transmission mechanism for aerospace according to the invention.
FIG. 2 is a schematic view of a planetary gear set of a transmission mechanism for aerospace of the invention.
FIG. 3 is a schematic view of a ball screw assembly of a transmission mechanism for aerospace according to the present invention.
In the figure: 1. a planetary gear set; 11. a sun gear; 111. a first permanent magnet; 12. a planet wheel; 121. a second permanent magnet; 13. an inner gear ring; 131. a third permanent magnet; 2. a ball screw pair; 21. a roller screw; 22. a flat bond; 23. and a nut.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
Example 1
With reference to fig. 1-2, a transmission mechanism for aerospace includes a planetary gear set 1 and a ball screw pair 2, the ball screw pair 2 is connected to the planetary gear set 1, the planetary gear set 1 and the ball screw pair 2 are arranged in a linear manner, the planetary gear set 1 includes a sun gear 11, a planet gear 12, an inner gear ring 13 and a permanent magnet, the sun gear 11 and the planet gear 12 are in an external engagement structure, the rotation directions of the external engagement gears of the sun gear 11 and the planet gear 12 are opposite, the planet gear 12 and the inner gear ring 13 are in an internal engagement gear structure, the internal engagement rotation directions of the planet gear 12 and the inner gear ring 13 are the same, and the sun gear 11 and the inner gear ring 13 are arranged coaxially.
The permanent magnet includes radial first permanent magnet 111, second permanent magnet 121 and the third permanent magnet 131 that magnetizes, first permanent magnet 111 is established to the surface of sun gear 11, second permanent magnet 121 is established to the surface of planet wheel 12, third permanent magnet 131 is established to the internal surface of ring gear 13, the permanent magnet includes that at least one magnetic pole is right, the magnetic pole of permanent magnet is to being formed by the even interval setting of N level magnetic sheet and S level magnetic sheet, the permanent magnet adopts neodymium iron boron permanent magnet material.
The sun gear 11, the planet gear 12 and the inner gear ring 13 are arranged in a concentric structure, the transmission of power is realized through the magnetic field modulation action of different magnetic gears, when the sun gear 11 is used as an input member and the inner gear ring 13 is used as an output member, as the rotating speed of the sun gear 11 is continuously increased, the magnetic fields of the sun gear 11 and the planet gears 12 deviate from the magnetic force balance position, the planet gears 12 are accelerated under the magnetic field modulation of the sun gear 11, as the rotating speed of the planet gears 12 is continuously increased, the magnetic fields of the planet gears 12 and the inner gear ring 13 deviate from the magnetic force balance position, the inner gear ring 13 is accelerated under the magnetic field modulation of the planet gears 12 until the three are in the magnetic force balance position again, at the moment, the permanent magnetic gears of the planetary gear train keep a stable rotating speed to move, so that, when other gears are used as input members or output members, the working principle of the planetary gear train is the same.
Example 2
With reference to fig. 1 and 3, the ball screw pair 2 includes a roller screw 21, a nut 23 and a flat key 22, one end of the roller screw 21 is connected to the planetary gear set 1, the nut 23 is sleeved on the ball screw, the flat key 22 is arranged on the nut 23, and the nut 23 is a combined double nut 23 without an axial gap formed by two nuts 23.
Combine planetary gear set 1 and ball 2, through motor drive planetary gear set 1, planetary gear set 1 is equivalent to ball 2 reduction gear, makes the more steady operation of lead screw, realizes ball 2 different drive ratios, makes ball 21 have very strong bearing capacity and life-span, has higher rotational speed and angular acceleration, applicable in multiple condition, realizes drive mechanism's volume miniaturization and weight lightweight.
Example 3
On the basis of embodiment 1, the planet wheel is connected with the planet carrier, and the sun wheel, the planet carrier and the internal gear are coaxially arranged.
The sun gear radius R1Radius R of planet wheel2And ring gear radius R3Satisfies the following conditions: r1+2R2＝R3。
The number of magnetic pole pairs P of the sun wheel1Planet wheel magnetic pole pair number P2And the number of pole pairs P of the inner gear ring3Satisfies the following conditions:P1+2P2＝P3。
the radius of the planet carrier satisfies: r4＝(R3+R1)/2。
The number of the planet wheels satisfies:
wherein
And a, b belongs to N, and N is more than or equal to 1 and less than or equal to 4.
The sun wheel angular velocity ω1Angular velocity omega of planet carrier4And annular gear angular velocity ω3Satisfies the following conditions:
angular velocity ω of the ball screwGSatisfies the following conditions:
wherein d is1Diameter of the screw, d2Is the nut diameter.
The planet wheel and the sun are both adhered magnetic sheets on the outer ring of the back iron in an N-pole and S-pole sequentially alternating mode, external meshing is formed between the planet wheel and the sun, the inner gear ring is adhered with the magnetic sheets on the inner ring of the back iron in the same mode to realize internal meshing with the planet wheel, driving parameters are set, and non-contact transmission is realized between different interacting magnetic gears through magnetic coupling of the N pole and the S pole, so that the roller axis of the ball screw is always kept parallel to the axis of the screw rod, and the roller is kept in good contact with the nut and the screw rod.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalents and substitutions made within the scope of the present invention should be included.
Claims (7)
1. A transmission mechanism for spaceflight is characterized in that: the planetary gear set comprises a planetary gear set (1) and a ball screw pair (2), wherein the ball screw pair (2) is connected with the planetary gear set (1), the planetary gear set (1) and the ball screw pair (2) are arranged in a linear mode, the planetary gear set (1) comprises a sun gear (11), a planet gear (12), an inner gear ring (13) and permanent magnets, the sun gear (11) and the inner gear ring (13) are arranged in a coaxial line mode, the permanent magnets comprise a first permanent magnet (111), a second permanent magnet (121) and a third permanent magnet (131), the first permanent magnet (111) is arranged on the outer surface of the sun gear (11), the second permanent magnet (121) is arranged on the outer surface of the planet gear (12), the third permanent magnet (131) is arranged on the inner surface of the inner gear ring (13), and the permanent magnets comprise;
the ball screw pair (2) comprises a roller screw (21), a nut (23) and a flat key (22), one end of the roller screw (21) is connected with the planetary gear set (1), the nut (23) is sleeved on the ball screw, and the flat key (22) is arranged on the nut (23).
2. A drive mechanism for aerospace according to claim 1, wherein: the planetary gear set (1) and the ball screw pair (2) are arranged in the coaxial direction.
3. A drive mechanism for aerospace according to claim 1 or 2, wherein: the sun wheel (11) and the planet wheel (12) are of an external meshing structure, and the rotating directions of external meshing gears of the sun wheel (11) and the planet wheel (12) are opposite.
4. A drive mechanism for aerospace according to any one of claims 1 to 3, wherein: the planet gear (12) and the inner gear ring (13) are of an inner gear structure, and the inner gear rotating directions of the planet gear (12) and the inner gear ring (13) are the same.
5. A drive mechanism for aerospace according to claim 1, wherein: the magnetic pole pair of the permanent magnet is formed by arranging N-level magnetic sheets and S-level magnetic sheets at even intervals, and the permanent magnet is made of a neodymium iron boron permanent magnet material.
6. A drive mechanism for aerospace according to claim 1, wherein: the first permanent magnet (111), the second permanent magnet (121) and the third permanent magnet (131) are all magnetized in the radial direction.
7. A drive mechanism for aerospace according to claim 1, wherein: the nut (23) adopts a combined double nut (23) without axial clearance and composed of two nuts (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910940810.8A CN110798048A (en) | 2019-09-30 | 2019-09-30 | Transmission mechanism for spaceflight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910940810.8A CN110798048A (en) | 2019-09-30 | 2019-09-30 | Transmission mechanism for spaceflight |
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| Publication Number | Publication Date |
|---|---|
| CN110798048A true CN110798048A (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910940810.8A Pending CN110798048A (en) | 2019-09-30 | 2019-09-30 | Transmission mechanism for spaceflight |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012022456A1 (en) * | 2012-11-15 | 2014-05-15 | Volkswagen Aktiengesellschaft | Planetary gear for torque transfer device, has gear units each comprising set of permanent magnets that interact with corresponding set of magnets of sun gear and/or internal gear to transmit torque |
| CN106438857A (en) * | 2015-08-07 | 2017-02-22 | 日本电产三协株式会社 | Planetary gear speed reduction device and driving mechanism |
| CN207893077U (en) * | 2018-02-02 | 2018-09-21 | 南通亚威机械制造有限公司 | A kind of double-nut gasket type ball screw assembly, |
| CN208268335U (en) * | 2018-04-02 | 2018-12-21 | 丽水市吴越机械制造有限公司 | A kind of new pattern rolling ball screw pair |
-
2019
- 2019-09-30 CN CN201910940810.8A patent/CN110798048A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012022456A1 (en) * | 2012-11-15 | 2014-05-15 | Volkswagen Aktiengesellschaft | Planetary gear for torque transfer device, has gear units each comprising set of permanent magnets that interact with corresponding set of magnets of sun gear and/or internal gear to transmit torque |
| CN106438857A (en) * | 2015-08-07 | 2017-02-22 | 日本电产三协株式会社 | Planetary gear speed reduction device and driving mechanism |
| CN207893077U (en) * | 2018-02-02 | 2018-09-21 | 南通亚威机械制造有限公司 | A kind of double-nut gasket type ball screw assembly, |
| CN208268335U (en) * | 2018-04-02 | 2018-12-21 | 丽水市吴越机械制造有限公司 | A kind of new pattern rolling ball screw pair |
Non-Patent Citations (1)
| Title |
|---|
| 王日俊，白越，曾志强，段能全，党长营，杜文华，王俊元: "无人飞行器在油气输送管道监测系统的应用进展与展望", 《科技和产业》 * |
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Application publication date: 20200214 |