CN108799362B - light small-sized mechanical centrifugal speed limiting device - Google Patents
light small-sized mechanical centrifugal speed limiting device Download PDFInfo
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- CN108799362B CN108799362B CN201810643894.4A CN201810643894A CN108799362B CN 108799362 B CN108799362 B CN 108799362B CN 201810643894 A CN201810643894 A CN 201810643894A CN 108799362 B CN108799362 B CN 108799362B
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D59/00—Self-acting brakes, e.g. coming into operation at a predetermined speed
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- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to a light small mechanical centrifugal speed limiting device, which comprises: the device comprises a base (18), an annular stator (11), a large rotor (12), a small rotor (13), a fixed column (15), a sliding column (16), a cylindrical spiral extension spring (17) and a first fixing device; the base (18) is provided with an annular stator (11); a plurality of bulges (10) which are uniformly distributed in the circumferential direction are arranged on the inner wall of the annular stator (11); a large rotor (12) and a small rotor (13) are arranged in the annular stator (11), the large rotor (12) and the small rotor (13) are connected and fixed together, and the cross sections of the large rotor and the small rotor form a circle together; the large rotor (12) includes: a first plane (6) and a first arc surface (22); the small rotor (13) comprises: a second plane (20) and a second arc surface (23); the first plane (6) and the second plane (20) are closely attached together; the sliding column (16) and the fixed column (15) are connected through a cylindrical spiral extension spring (17).
Description
Technical Field
The invention belongs to the technical field of mechanical speed limiters, and particularly relates to a light and small mechanical centrifugal speed limiting device.
Background
The deployment device has been valued and applied in the early development stage of spacecraft technology. Due to the weight limitation of the spacecraft, lightweight deployment mechanisms with various forms and simple structures are rapidly developed and applied. Among them, some unfolding mechanisms utilize self-stored elastic strain energy to unfold, and they have the advantages of relatively simple structure, light weight, high storage rate, high reliability, etc., for example, thin-walled tubular booms, coiled booms, etc., and are widely used in monopole and dipole antennas, gravity gradient stabilizer bars, support arms of sensors or cameras, and unfolding support systems of solar sails. The unfolding mechanism has the advantages of high speed, difficulty in control, easiness in damage of the stretching arm and even influence on the postures of the micro-nano satellites in the unfolding process. For this reason, the deployment speed of the deployment mechanism needs to be controlled.
currently, the speed reduction devices which are applied more have two types: firstly, a motor is adopted to control the unfolding speed; the method has the defects that the volume and the mass are larger, the method is not suitable for loads with strict requirements on the mass and the volume, and meanwhile, the whole mechanism is more complex and has lower reliability due to the adoption of the motor control; secondly, adopt centrifugal friction formula speed limiter, mainly utilize frictional force to control the rotational speed, the main shortcoming is: the friction generated is generally low enough to be rate limiting. In general, to increase the friction, additional counterweight masses are often used to increase the friction, which results in an increase in the overall volume and mass of the governor that is unacceptable for miniature deployment mechanisms for space applications. In addition, the measurement of the friction coefficient is complex, which causes difficulty in accurately calculating the magnitude of the friction force, and therefore, it is difficult to accurately select the mass of the spring or the weight block to adjust the friction force.
Disclosure of Invention
The invention aims to solve the defects of the conventional speed reducing device, and provides a light and small mechanical centrifugal speed limiting device which has the characteristics of light weight and small volume, does not need to adopt a more complex control method such as a motor and the like, can accurately limit speed, solves the problem of poor speed reducing effect caused by insufficient friction force in the conventional scheme, and overcomes the defect of large quality caused by the need of additionally increasing additional mass to improve the friction force.
In order to achieve the purpose, the invention provides a light and small mechanical centrifugal speed limiting device, which can meet the speed limiting requirement of a spreading device under the harsh requirements on mass and volume and has the function of accurately limiting the speed; wherein, centrifugation speed-limiting device includes: the device comprises a base, an annular stator, a large rotor, a small rotor, a fixed column, a sliding column, a cylindrical spiral extension spring and a first fixing device;
The base is provided with an annular stator, and the annular stator are of an integrally formed structure; a plurality of bulges which are uniformly distributed in the circumferential direction are arranged on the inner wall of the annular stator, and the bulges are arc-shaped; a large rotor and a small rotor are arranged in the annular stator, the large rotor is positioned above the small rotor, and the cross sections of the large rotor and the small rotor form a circle together;
The large rotor includes: a first plane and a first arc surface; the first arc surface is positioned on the first plane, and the first arc surface and the first plane are of an integrated structure; a first unthreaded hole is formed in the center of the first plane, a plurality of countersunk through holes are symmetrically formed in two sides of the first unthreaded hole, a second unthreaded hole is formed in the center of the first arc surface, and a sliding column with a hemispherical surface is placed in the second unthreaded hole;
The small rotor includes: a second plane and a second arc surface; the second arc surface is positioned below the second plane and is of an integral structure; a third unthreaded hole is formed in the center of the second plane, a plurality of first threaded holes are symmetrically formed in two sides of the third unthreaded hole, a fourth unthreaded hole is formed in the center of the second arc surface, a fixing column is placed in the fourth unthreaded hole, and the fixing column is fixed in the fourth unthreaded hole through a first fixing device; the countersunk through holes correspond to the first threaded holes one by one, the first plane and the second plane are tightly attached together, and the large rotor and the small rotor are fixed by a plurality of second fixing devices to form a cylindrical structure; the sliding column and the fixed column are connected through a cylindrical spiral extension spring.
in the above technical scheme, a plurality of mounting holes are symmetrically arranged on two sides of the base, and the base is fixed through a third fixing device and used for fixing the annular stator.
In the technical scheme, one end of the sliding column is provided with a hemispherical surface, and the other end of the sliding column is fixedly connected with a first small cylinder; the fixing column is of a cylindrical structure, one end of the fixing column is provided with a second cylinder, and a key is arranged on the outer circumferential surface of the fixing column, wherein the key is arranged in a key groove of the fourth unthreaded hole.
In the above technical scheme, a fifth unthreaded hole is formed in the first small cylinder, a sixth unthreaded hole is formed in the second small cylinder, one end of the cylindrical helical extension spring is fixedly connected to the fifth unthreaded hole, and the other end of the cylindrical helical extension spring is fixedly connected to the sixth unthreaded hole.
In the above technical solution; the outer diameter size of the cylindrical helical extension spring, the diameter size of the first small cylinder and the diameter size of the second small cylinder are consistent and are 0.1mm smaller than the diameter of the first unthreaded hole, and the cylindrical helical extension spring is used for respectively placing the first small cylinder in the first unthreaded hole and placing the second small cylinder in the third unthreaded hole.
In the above technical solution, the lengths of the first plane and the second plane are equal; the perimeter of the first arc surface is larger than the perimeter of the second arc surface.
in the technical scheme, the second unthreaded hole is communicated and coaxial with the first unthreaded hole, and molybdenum disulfide is coated in the first unthreaded hole and the second unthreaded hole and used for reducing friction of the sliding column and the cylindrical helical tension spring when the sliding column and the cylindrical helical tension spring move in the second unthreaded hole; the diameter of the second unthreaded hole is larger than that of the first unthreaded hole; the diameter of the second unthreaded hole is 0.1mm larger than that of the sliding column, and the sliding column is used for being placed in the second unthreaded hole and can freely slide; the diameter of the first small cylinder is 0.1mm smaller than that of the first light hole.
In the above technical solution, the third optical aperture is communicated with and coaxial with the fourth optical aperture, and the diameter of the fourth optical aperture is larger than that of the third optical aperture; the third unthreaded hole is used for reserving space so as to be convenient for connecting the spring hooks at two ends of the cylindrical spiral extension spring to the fifth unthreaded hole and the sixth unthreaded hole respectively; the fourth unthreaded hole's effect is left the space and is conveniently fixed first fixing device on the fixed column.
In the above technical solution, the first fixing device is a nut, and the second fixing device and the third fixing device are screws.
And (3) coaxially and fixedly connecting a shaft system needing to be decelerated with a cylinder formed by connecting a large rotor and a small rotor. When the sliding column slides out of the second unthreaded hole under the action of centrifugal force and overcomes the spring tension, the sliding column is blocked by the bulge on the inner surface of the annular stator to realize speed reduction, the centrifugal force is reduced, then the sliding column slides into the second unthreaded hole under the action of the spring tension, and the cylinder formed by connecting the large rotor and the small rotor can continue to rotate under the drive of the shafting. The intermittent deceleration is achieved by the cyclic reciprocating.
The invention has the advantages that:
The speed limiting device provided by the invention can meet the speed limiting requirement of the unfolding device under the condition of harsh requirements on mass and volume, has the function of accurately limiting the speed, has light weight and small volume, does not need to adopt a more complex control method such as a motor and the like, can accurately limit the speed, solves the problem of poor speed reduction effect caused by insufficient friction force in the existing scheme, and also overcomes the defect of large mass caused by additionally adding additional mass to improve the friction force.
Drawings
FIG. 1 is a schematic structural view of a light and small mechanical centrifugal governor of the present invention;
FIG. 2 is a schematic structural diagram of a cylindrical helical tension spring assembled with a sliding column and a fixed column in the light and small mechanical centrifugal speed limiting device of the invention;
FIG. 3 is a schematic structural diagram of a large rotor in a light and small mechanical centrifugal speed limiting device of the present invention;
Fig. 4 is a schematic structural diagram of a small rotor in the light small mechanical centrifugal speed limiting device of the invention.
The attached drawings are as follows:
1. Hemisphere surface 2, key
3. third unthreaded hole 4, countersunk head through hole
5. Keyway 6, first plane
7. first threaded hole 8 and first unthreaded hole
9. Second unthreaded hole 10, boss
11. Annular stator 12, big rotor
13. Small rotor 14 and nut
15. Fixed column 16 and sliding column
17. Cylindrical helical extension spring 18, base
19. Mounting hole 20, second plane
21. Fourth unthreaded hole 22 and first arc surface
23. second arc surface 24 and sixth unthreaded hole
25. Screw 26, first small cylinder
27. Fifth unthreaded hole 28, second small cylinder
Detailed Description
As shown in fig. 1 and 2, the invention provides a light and small mechanical centrifugal speed limiting device, which can meet the speed limiting requirement of a unfolding device under the harsh requirements on mass and volume and has the function of accurately limiting the speed; wherein, centrifugation speed-limiting device includes: the device comprises a base 18, an annular stator 11, a large rotor 12, a small rotor 13, a fixed column 15, a sliding column 16, a cylindrical spiral extension spring 17 and a first fixing device;
The base 18 is provided with an annular stator 11, and the annular stator are of an integrally formed structure; a plurality of protrusions 10 which are uniformly distributed in the circumferential direction are arranged on the inner wall of the annular stator 11, and the protrusions 10 are arc-shaped, so that the sliding column 16 which slides out can be blocked to realize a speed reduction function, and the sliding column cannot be clamped; a large rotor 12 and a small rotor 13 are arranged in the annular stator 11, the large rotor 12 is positioned above the small rotor 13, and the cross sections of the large rotor 12 and the small rotor 13 form a circle together;
As shown in fig. 4, the large rotor 12 includes: a first plane 6 and a first arc surface 22; the first arc surface 22 is located on the first plane 6, and the two are an integral structure; a first unthreaded hole 8 is formed in the center of the first plane 6, two countersunk through holes 4 are symmetrically formed in two sides of the first unthreaded hole 8, a second unthreaded hole 9 is formed in the center of the first arc surface 22, and a sliding column 16 is placed in the second unthreaded hole 9;
as shown in fig. 3, the small rotor 13 includes: a second plane 20 and a second arc surface 23; the second arc surface 23 is positioned below the second plane 20, and the second arc surface and the second plane are of an integral structure; a third unthreaded hole 3 is formed in the center of the second plane 20, two first threaded holes 7 are symmetrically formed in two sides of the third unthreaded hole 3, a fourth unthreaded hole 21 is formed in the center of the second arc surface 23, a fixing column 15 is placed in the fourth unthreaded hole 21, and the fixing column 15 is fixed in the fourth unthreaded hole 21 through a first fixing device; the countersunk through holes 4 correspond to the first threaded holes 7 one by one, the first plane 6 is tightly attached to the second plane 20, and the large rotor 12 and the small rotor 13 are fixed by a plurality of second fixing devices to form a cylindrical structure; the slide column 16 and the fixed column 15 are connected by a cylindrical helical extension spring 17.
In the above technical solution, a plurality of mounting holes 19 are symmetrically provided on both sides of the base 18, and are fixed by a third fixing device for fixing the annular stator 11.
In the above technical solution, the sliding column 16 is a cylindrical structure with one end provided with a hemispherical surface 1 and the other end fixedly connected with a first small cylinder 26; the fixed column 15 is a cylindrical structure with one end provided with a second small cylinder 28, and the outer circumferential surface of the fixed column is provided with a key 2, wherein the key 2 is installed in the key slot 5 of the fourth unthreaded hole 21.
In the above technical solution, a fifth unthreaded hole 27 is formed in the first small cylinder 26, a sixth unthreaded hole 24 is formed in the second small cylinder 28, one end of the cylindrical helical extension spring 17 is fixedly connected to the fifth unthreaded hole 27, and the other end of the cylindrical helical extension spring is fixedly connected to the sixth unthreaded hole 24.
in the above technical solution; the outer diameter of the cylindrical helical extension spring 17, the diameter of the first small cylinder 26 and the diameter of the second small cylinder 28 are the same, and are all 0.1mm smaller than the diameter of the first unthreaded hole 8, and the cylindrical helical extension spring is used for respectively placing the first small cylinder 26 in the first unthreaded hole 8 and placing the second small cylinder 28 in the third unthreaded hole 3.
In the above technical solution, the first plane 6 and the second plane 20 have the same length; the circumference of the first circular arc surface 22 is larger than the circumference of the second circular arc surface 23.
In the technical scheme, the second unthreaded hole 9 is communicated and coaxial with the first unthreaded hole 8, and molybdenum disulfide is coated in the first unthreaded hole 8 and the second unthreaded hole 9 and used for reducing friction between the sliding column 16 and the cylindrical helical tension spring 17 when the sliding column and the cylindrical helical tension spring move in the second unthreaded hole 9; the diameter of the second light hole 9 is larger than that of the first light hole 8; the diameter of the second unthreaded hole 9 is 0.1mm larger than that of the sliding column 16, and the sliding column 16 is used for being placed in the second unthreaded hole 9 and can freely slide; the diameter of the first small cylinder 26 is 0.1mm smaller than the diameter of the first light hole 8.
In the above technical solution, the third light hole 3 is communicated with and coaxial with the fourth light hole 21, and the diameter of the fourth light hole 21 is larger than that of the third light hole 3; the third unthreaded hole 3 is used for reserving space to conveniently connect the spring hooks at two ends of the cylindrical helical extension spring 17 to the fifth unthreaded hole 27 and the sixth unthreaded hole 24 respectively; the fourth light hole 21 is used for allowing a space to conveniently fix the first fixing device on the fixing column 15.
In the above technical solution, the first fixing device is the nut 14, and the second fixing device and the third fixing device are the screws 25.
As shown in fig. 1, the spring hook at one end of the cylindrical helical extension spring 17 is connected to the fifth unthreaded hole 27 of the sliding column 16, then one end of the cylindrical helical extension spring 17 is inserted into the second unthreaded hole 9 of the large rotor 12 and is threaded out of the first unthreaded hole 8, then the spring hook at the other end of the cylindrical helical extension spring 17 is connected to the sixth unthreaded hole 28 of the fixed column 15, then the threaded end of the fixed column 15 is inserted into the fourth unthreaded hole 21 of the small rotor 13, so that the key 2 is inserted into the key groove 5, the fixed column 15 is fixed on the small rotor 13 by the nut 14, finally the first plane 6 and the second plane 20 are contacted with each other, the screw 25 is inserted into the symmetrical countersunk through hole 4 and is screwed into the first threaded hole 7, and thus the large rotor 12 and the small rotor 13 are connected into a whole, and the appearance is a cylinder. The shaft system needing to be decelerated is coaxially fixed with a cylinder formed by connecting a large rotor 12 and a small rotor 13. Finally, a cylindrical body formed by coupling the large rotor 12 and the small rotor 13 is installed coaxially with the annular stator 11.
finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A light small-sized mechanical centrifugal speed limiting device is characterized by comprising: the device comprises a base (18), an annular stator (11), a large rotor (12), a small rotor (13), a fixed column (15), a sliding column (16), a cylindrical spiral extension spring (17) and a first fixing device;
The base (18) is provided with an annular stator (11) which is of an integrally formed structure; a plurality of bulges (10) which are uniformly distributed in the circumferential direction are arranged on the inner wall of the annular stator (11), and the bulges (10) are arc-shaped; a large rotor (12) and a small rotor (13) are arranged in the annular stator (11), the large rotor (12) and the small rotor (13) are connected and fixed together, and the cross sections of the large rotor and the small rotor form a circle together;
The large rotor (12) includes: a first plane (6) and a first arc surface (22); the first arc surface (22) is positioned on the first plane (6), and the first arc surface and the first plane are of an integrated structure; a first unthreaded hole (8) is formed in the center of the first plane (6), a plurality of countersunk through holes (4) are symmetrically formed in two sides of the first unthreaded hole (8), a second unthreaded hole (9) is formed in the center of the first arc surface (22), and a sliding column (16) is placed in the second unthreaded hole (9);
The small rotor (13) comprises: a second plane (20) and a second arc surface (23); the second arc surface (23) is positioned below the second plane (20) and is of an integral structure; a third unthreaded hole (3) is formed in the center of the second plane (20), a plurality of first threaded holes (7) are symmetrically formed in two sides of the third unthreaded hole (3), a fourth unthreaded hole (21) is formed in the center of the second arc surface (2), a fixing column (15) is placed in the fourth unthreaded hole (21), and the fixing column (15) is fixed in the fourth unthreaded hole (21) through a first fixing device; the countersunk head through holes (4) correspond to the first threaded holes (7) one by one, the first plane (6) and the second plane (20) are tightly attached together, and the large rotor (12) and the small rotor (13) are fixed by a plurality of second fixing devices to form a cylindrical structure; the sliding column (16) and the fixed column (15) are connected through a cylindrical spiral extension spring (17).
2. Device according to claim 1, characterized in that the base (18) is provided symmetrically on both sides with mounting holes (19) for fixing the ring stator (11) by means of a third fixing means.
3. The device according to claim 1, characterized in that the sliding column (16) is a cylindrical structure with a hemisphere (1) at one end and a first small cylinder (26) fixed at the other end; the fixing column (15) is of a cylindrical structure, one end of the fixing column is provided with a second small cylinder (28), and the outer circumferential surface of the fixing column (15) is provided with a key (2), wherein the key (2) on the fixing column (15) is placed in a key groove (5) on the small rotor (13), and the fixing column is fixed on the small rotor (13) through a nut (14).
4. the device according to claim 3, characterized in that the first small cylinder (26) is provided with a fifth light hole (27), the second small cylinder (28) is provided with a sixth light hole (24), one end of the cylindrical helical tension spring (17) is fixedly connected to the fifth light hole (27), and the other end thereof is fixedly connected to the sixth light hole (24).
5. The device according to claim 1, characterized in that the dimensions of the outer diameter of the cylindrical helical extension spring (17), of the diameter of the first small cylinder (26), and of the diameter of the second small cylinder (28) are identical, each being 0.1mm smaller than the diameter of the first light hole (8), for the placement of the first small cylinder (26) in the first light hole (8) and of the second small cylinder (28) in the third light hole (3), respectively.
6. The device according to claim 1, characterized in that the first plane (6) and the second plane (20) are of equal length; the circumference of the first arc surface (22) is larger than the circumference of the second arc surface (23).
7. The device according to claim 1, characterized in that the second unthreaded hole (9) is communicated with and coaxial with the first unthreaded hole (8), and molybdenum disulfide is coated in the first unthreaded hole (8) and the second unthreaded hole (9) for reducing friction when the sliding column (16) and the cylindrical helical tension spring (17) move in the second unthreaded hole (9); the diameter of the second light hole (9) is larger than that of the first light hole (8); the diameter of the second unthreaded hole (9) is 0.1mm larger than that of the sliding column (16), and the sliding column (16) is used for being placed in the second unthreaded hole (9) and can freely slide; the diameter of the first small cylinder (26) is 0.1mm smaller than the diameter of the first light hole (8).
8. the device according to claim 1, characterized in that the third light hole (3) is in communication and coaxial with the fourth light hole (21), the diameter of the fourth light hole (21) being greater than the diameter of the third light hole (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810643894.4A CN108799362B (en) | 2018-06-21 | 2018-06-21 | light small-sized mechanical centrifugal speed limiting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810643894.4A CN108799362B (en) | 2018-06-21 | 2018-06-21 | light small-sized mechanical centrifugal speed limiting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108799362A CN108799362A (en) | 2018-11-13 |
| CN108799362B true CN108799362B (en) | 2019-12-17 |
Family
ID=64084158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810643894.4A Active CN108799362B (en) | 2018-06-21 | 2018-06-21 | light small-sized mechanical centrifugal speed limiting device |
Country Status (1)
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| CN (1) | CN108799362B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5988328A (en) * | 1998-03-17 | 1999-11-23 | Dana Corporation | Spring set centrifugally released brake |
| CN2675170Y (en) * | 2004-01-08 | 2005-02-02 | 宝鸡秦新电气有限公司 | Centrifugal type overrunning governor and dually controllable multiplexing steady stopping device |
| EP1742345B1 (en) * | 2005-07-08 | 2010-06-02 | Dynatech, Dynamics & Technology, S. L. | Speed limiting system for lifting devices |
| CN102131726B (en) * | 2008-08-28 | 2013-05-22 | 三菱电机株式会社 | Elevator speed governor |
| CN103615482B (en) * | 2013-12-03 | 2016-01-20 | 北京航空航天大学 | A kind of microminiature mechanical type centrifugal friction speed limiting device |
| CN103656884A (en) * | 2013-12-09 | 2014-03-26 | 李国栋 | Slow descending protector |
| CN105805051A (en) * | 2014-12-31 | 2016-07-27 | 锦州新锦化机械制造有限公司 | Squeeze oil film damper |
| CN105197716B (en) * | 2015-09-21 | 2017-11-07 | 北京空间飞行器总体设计部 | A kind of centrifugal mechanical limiter of speed |
-
2018
- 2018-06-21 CN CN201810643894.4A patent/CN108799362B/en active Active
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