CN112319854B - Redundant actuating mechanism of non-auto-lock screw thread space unlocking device - Google Patents
Redundant actuating mechanism of non-auto-lock screw thread space unlocking device Download PDFInfo
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- CN112319854B CN112319854B CN202011218690.XA CN202011218690A CN112319854B CN 112319854 B CN112319854 B CN 112319854B CN 202011218690 A CN202011218690 A CN 202011218690A CN 112319854 B CN112319854 B CN 112319854B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/64—Systems for coupling or separating cosmonautic vehicles or parts thereof, e.g. docking arrangements
Abstract
The invention provides a non-self-locking thread space unlocking device redundancy driving mechanism, which comprises: the inner ring of the flat spiral spring is connected with the outer ring of the overrunning clutch, and the outer ring of the flat spiral spring is connected with the transmission shell; the normal unlocking is driven by the non-self-locking force of the threaded connection, the redundant unlocking is released and driven by the flat spiral spring, and meanwhile, the overrunning clutch ensures that the normal unlocking and the redundant unlocking do not have the interference problem; the overrunning clutch consists of an inner planetary flywheel, an outer ring transmission mechanism and a transmission positioning mechanism between an inner ring and an outer ring. The invention adopts the overrunning type design of the inner planetary flywheel, can effectively avoid the problem of mutual interference of non-self-locking force and the spring force of the plane volute spiral, and can also effectively improve the reliability of the device due to the self force storage characteristic of the plane volute spiral spring.
Description
Technical Field
The invention relates to the technical field of spacecraft space unlocking devices, in particular to a redundant driving mechanism of a non-self-locking threaded space unlocking device.
Background
The space separation device based on the non-self-locking threaded connection is characterized in that a nut is made into a flywheel, when the nut is in compression connection, a shape memory alloy driving clamping mechanism is used for restraining the nut to rotate and the non-self-locking threaded connection is realized through a bearing screw rod, and at the moment, the flywheel nut is in a potential storage state to be rotated under the action of non-self-locking force; when the flywheel nut is released, the SMA wire is electrified to shrink to release the limit of the clamping mechanism on the nut, and the flywheel nut realizes inertia reversal and unlocking under the action of the threaded connection non-self-locking force.
During launching and orbit entering of the spacecraft, the spacecraft can experience various transient and steady-state load influences including impact, vibration, noise and the like, and even the loading nut can be loosened and the loading force fails in severe cases, so that the spacecraft accessories and the spacecraft can not unlock the mission. In order to ensure that the device is unlocked smoothly and has good reliability, the unlocking power source of the non-self-locking thread pressing and releasing device needs to be designed redundantly, so that the unlocking can be realized through the driving force provided by the redundant part even if the loading force of the loading nut fails.
Disclosure of Invention
According to the technical problem that in the launching and orbit entering process of the spacecraft, the spacecraft can experience various transient and steady-state load influences including impact, vibration, noise and the like, even the loading nut is loosened and the loading force fails in serious conditions, so that the accessories of the spacecraft and the spacecraft cannot be unlocked to cause task failure, the non-self-locking thread space unlocking device redundancy driving mechanism is provided. The invention mainly utilizes the inner planetary flywheel and the outer ring of the star wheel to combine with the plane volute spring to unlock the whole device, thereby effectively solving the hidden trouble that the non-self-locking screw thread space unlocking device fails under the influence of loads such as impact, vibration and the like.
The technical means adopted by the invention are as follows:
a non-self-locking threaded space unlocking device redundant drive mechanism comprising: the inner ring of the plane spiral spring is connected with the outer ring of the overrunning clutch, and the outer ring of the plane spiral spring is connected with the transmission shell; the normal unlocking is driven by the non-self-locking force of the threaded connection, the redundant unlocking is released and driven by the flat spiral spring, and meanwhile, the overrunning clutch ensures that the normal unlocking and the redundant unlocking do not have the interference problem;
the overrunning clutch is composed of an inner planetary flywheel, an outer ring transmission mechanism and a transmission positioning mechanism between the inner ring and the outer ring, and the inner ring of the overrunning clutch can realize overrunning motion.
Furthermore, the inner planetary flywheel is made of a flywheel nut of the non-self-locking thread space unlocking device and is an inner ring of the overrunning clutch, the top of the inner planetary flywheel is circumferentially limited through a limiting boss, the inner planetary flywheel and a force bearing screw rod of the non-self-locking thread space unlocking device form non-self-locking connection, the middle part of the inner planetary flywheel and the outer ring of the star wheel form clamping connection through a cylindrical roller in a non-overrunning state, and the upper part of the inner planetary flywheel and the transmission shell form axial positioning through a thrust roller bearing;
the inner planetary flywheel is jointed and surpassed with the star wheel outer ring driven by the plane volute spring through the rolling of the cylindrical roller in the wedge-shaped groove of the inner planetary flywheel, so that the unlocking reliability of the device is ensured.
Furthermore, the inner planetary flywheel is of a multi-step type ring body structure, a first step, a second step, a third step, a fourth step and a fifth step are sequentially arranged from bottom to top, the first step is a lower limiting concave table of the self-aligning ball bearing, the second step is an upper limiting convex table of the self-aligning ball bearing, the third step is a main body part of the inner planetary flywheel, three wedge-shaped grooves are uniformly distributed on the main body part, a round hole is formed in the inner wall of each wedge-shaped groove, the fourth step is a radial limiting convex table of the thrust roller bearing, and the fifth step is a main body part of the inner planetary flywheel and a limiting convex table is arranged at the top of the main body part;
and a non-self-locking spiral groove is formed in the annular body structure.
Furthermore, the outer ring transmission mechanism consists of a star wheel outer ring and a lower mounting seat, the star wheel outer ring is of a circular ring structure, the bottom end of the star wheel outer ring is provided with an annular bulge, at least six threaded holes I are uniformly distributed in the star wheel outer ring, bolts are connected in the threaded holes I in a matched mode, and the bolts are connected with a threaded hole II formed in the upper end of the lower mounting seat in a matched mode;
the star wheel outer ring is the outer ring of the overrunning clutch, is in clamping connection with the inner planetary flywheel through a cylindrical roller in a non-overrunning state, realizes circumferential transmission with the lower mounting seat through the annular bulge, and realizes axial positioning with the lower mounting seat through a bolt;
the inner ring of the lower mounting seat and the inner planetary flywheel realize radial positioning and transmission through two self-aligning ball bearings, and the bottom of the lower mounting seat realizes axial positioning and transmission through a thrust needle bearing.
Furthermore, the lower mounting seat is of an I-shaped annular structure, an annular concave table is arranged at the upper end of the lower mounting seat, and the annular concave table is matched with an annular bulge of the outer ring of the star wheel through the bolt and fastened to transmit torque;
the top of the inner ring of the lower mounting seat is provided with an annular boss for limiting the axial positioning of the self-aligning ball bearing, the lower part of the inner ring is provided with an annular groove for limiting the positioning of the outer bearing positioning ring so as to realize the axial positioning of the self-aligning ball bearing, and the bottom end of the lower mounting seat is provided with a thin-wall annular structure for limiting the radial positioning of the thrust needle roller bearing;
the outer ring of the lower mounting seat is provided with an annular deep groove, and the annular deep groove is connected with the flat spiral spring.
Furthermore, the transmission positioning mechanism between the inner ring and the outer ring consists of a cylindrical roller, a roller spring stop block, a thrust needle bearing, two self-aligning ball bearings, a bearing stop block, an inner bearing positioning ring and an outer bearing positioning ring, so that the positioning of the self-aligning ball bearings and the transmission between the inner ring and the outer ring of the overrunning clutch are realized;
the cylindrical roller is connected with the roller spring stop block, the outer surface of the cylindrical roller is in contact connection with the outer ring of the star wheel, the top of the cylindrical roller is in contact connection with the inner planet flywheel, and the bottom of the cylindrical roller is in contact connection with the lower mounting seat; the roller spring stop block consists of a cylindrical hollow sleeve and a spring, one end of the spring is fixed in a circular hole in the inner wall of the wedge-shaped groove of the inner planetary flywheel, the other end of the spring is fixed in the cylindrical hollow sleeve to realize axial extension of the cylindrical hollow sleeve, and the top end of the cylindrical hollow sleeve pushes the cylindrical roller between the inner planetary flywheel and the outer ring of the star wheel through the elasticity of the spring to realize contact connection of the three;
the thrust needle roller bearing is installed between the bottom of the outer ring of the lower installation seat and the transmission shell, the two self-aligning ball bearings are installed between the outer ring of the inner planetary flywheel and the inner ring of the lower installation seat in an up-and-down parallel mode, the bottom end of the self-aligning ball bearing located below is connected with the bearing stop block, the bottom end of the bearing stop block is connected with the inner bearing positioning ring, the inner bearing positioning ring is arranged in the annular groove of the outer ring of the inner planetary flywheel, and the outer bearing positioning ring is installed in the annular groove at the lower portion of the inner ring of the lower installation seat.
Further, the thrust needle roller bearing and the thrust roller bearing are axial positioning and transmission parts; the self-aligning ball bearing is a radial positioning and transmission part; the bearing stop block, the outer bearing positioning ring and the inner bearing positioning ring are axial positioning pieces of the self-aligning ball bearing.
Furthermore, the cylindrical hollow sleeve is a double-layer cylinder, the lower layer cylinder is a cylindrical cavity, and the top of the upper layer cylinder is provided with an arc-shaped groove which is connected with the cylindrical roller; one end of the spring is fixed in the cylindrical cavity, and the other end of the spring is fixed in a circular hole in the inner wall of the wedge-shaped groove of the inner planetary flywheel.
Further, the flat spiral spring is formed by rolling a rectangular metal strip.
Furthermore, the transmission shell is of a cylindrical shell structure, the top and the bottom of the transmission shell are both provided with mounting holes, and a T-shaped annular cavity is arranged in the transmission shell and used for accommodating the planar spiral spring and the overrunning clutch.
Under the normal working condition of the non-self-locking thread space unlocking device, the inner planetary flywheel is driven by the main power source (the main power source is a loading nut which is screwed at the lower end of a bolt, and the lower end of the bolt is applied with pretightening force so that the unlocking trend exists between the upper end of the bolt and a non-self-locking thread pair between the inner planetary flywheel) and forms differential motion with the outer ring of the star wheel by combining the auxiliary drive of a plane volute spring, and at the moment, a cylindrical roller which is originally compressed by a roller spring stop block in the wedge-shaped groove of the inner planetary flywheel overcomes the spring force due to inertia to roll to the wide groove of the wedge-shaped groove, so that the inner planetary flywheel and the outer ring of the star wheel rotate at the same steering different speeds respectively.
The working principle of the invention is as follows:
under the normal working condition of the redundant driving mechanism of the non-self-locking thread space unlocking device, the inner planetary flywheel is unlocked through non-self-locking force (the non-self-locking force is mainly from the loading force applied by a loading nut at the lower end of a bearing screw rod), the loading force applied by the loading nut is extremely large, so that the inner planetary flywheel has extremely large acceleration at the moment after the limit is removed, but the acceleration is quickly attenuated to a stable negative number (generated by friction resistance moment) because the loading force disappears at the moment of unlocking, so that the inner planetary flywheel and the outer ring of the star wheel form differential motion at the initial unlocking stage of the device, at the moment, the cylindrical roller which is originally compressed in the wedge groove of the inner planetary flywheel through the roller spring stop block overcomes the spring force and rolls to the wide groove of the wedge groove due to inertia, and the inner planetary flywheel and the outer ring of the star wheel are separated from contact; however, as the speed of the inner planetary flywheel is continuously reduced until the speed is lower than the rotation speed of the star wheel outer ring, the inner planetary flywheel and the star wheel outer ring are jointed again to realize second-stage unlocking.
When the non-self-locking thread force of the redundant driving mechanism of the non-self-locking thread space unlocking device fails, the planar volute spring drives the star wheel outer ring to rotate along the anticlockwise direction after the top limit boss of the inner planetary flywheel is relieved from limiting, the cylindrical roller is wedged tightly between the star wheel outer ring and the inner planetary flywheel through friction force while the star wheel outer ring rotates, the two keep in a joint state, and therefore the inner planetary flywheel is driven to rotate in the same rotation direction, and the unlocking of the device is completed.
Compared with the prior art, the invention has the following advantages:
1. the redundant driving mechanism of the non-self-locking thread space unlocking device provided by the invention can effectively solve the hidden trouble that the non-self-locking thread space unlocking device fails under the influence of loads such as impact, vibration and the like.
2. According to the non-self-locking thread space unlocking device redundancy driving mechanism provided by the invention, the planar spiral spring has the characteristic of storing larger energy in a smaller space, and can efficiently complete the unlocking task in a limited installation space.
3. According to the redundant driving mechanism of the non-self-locking threaded space unlocking device, the energy storage of the flat spiral spring is completed at the initial stage of assembly until the limit boss of the inner planetary flywheel releases the limit energy to be released, the reliability of the energy storage of the flat spiral spring is high in the period, the flat spiral spring cannot lose efficacy due to the influence of loads such as impact and vibration, and the reliability of the device is effectively improved.
4. The redundancy driving mechanism of the non-self-locking thread space unlocking device provided by the invention adopts an overrunning type design of the inner planet wheel, can effectively avoid the problem that the non-self-locking force and the spring force of the plane volute spiral are mutually interfered, and can also effectively improve the reliability of the device due to the self force storage characteristic of the plane volute spiral spring.
5. According to the redundancy driving mechanism of the non-self-locking threaded space unlocking device, the non-self-locking force is released instantly, so that the acceleration of the inner planetary flywheel is reduced to a negative number at the unlocking instant, the speed of the inner planetary flywheel is continuously reduced under the normal working condition, but due to the existence of the overrunning clutch, when the speed of the inner planetary flywheel is reduced to the outer ring speed, the inner planetary flywheel is driven secondarily by the plane volute spiral spring force, and the unlocking time can be effectively reduced.
In conclusion, the technical scheme of the invention can solve the problems that in the prior art, the spacecraft can experience various transient and steady load influences including impact, vibration, noise and the like in the launching and orbit entering process, even the loading nut is loosened and the loading force fails in serious conditions, and further the accessories and the spacecraft of the spacecraft can not be unlocked to cause task failure.
Based on the reason, the invention can be widely popularized in the fields of spacecraft space unlocking and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a sectional view showing the overall structure of the present invention.
FIG. 2 is a partial view of the flat spiral spring of the present invention when driven.
FIG. 3 is a partial view of the non self-locking thread drive of the present invention.
FIG. 4 is a schematic structural diagram of the internal planetary flywheel of the present invention.
FIG. 5 is a front view of the internal planetary flywheel of the present invention.
Fig. 6 is a schematic structural view of the lower mounting base of the present invention.
Fig. 7 is a schematic structural diagram of the star wheel outer ring of the invention.
Fig. 8 is a schematic structural view of the transmission housing of the present invention.
Fig. 9 is a schematic view of the structure of the roller spring stopper of the present invention.
In the figure: 1. an inner planetary flywheel; 101. a first step; 102. a second level of steps; 103. a third step; 104. a fourth layer of steps; 105. a fifth layer step; 2. a thrust roller bearing; 3. a transmission housing; 4. a thrust needle bearing; 5. an outer bearing positioning ring; 6. a bearing stop; 7. an inner bearing positioning ring; 8. a flat spiral spring; 9. a self-aligning ball bearing; 10. a lower mounting seat; 11. a star wheel outer ring; 12. a cylindrical roller; 13. a roller spring stop.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in the figures, the invention provides a non-self-locking thread space unlocking device redundancy driving mechanism, which comprises: the transmission device comprises a transmission shell 3, and a flat spiral spring 8 and an overrunning clutch which are arranged in the transmission shell 3, wherein the inner ring of the flat spiral spring 8 is connected with the outer ring of the overrunning clutch, and the outer ring of the flat spiral spring 8 is connected with the inner ring of the transmission shell 3; normal unblock is accomplished by threaded connection non-self-locking power drive, and redundant unblock is by planar volute spiral spring 8 release drive, simultaneously freewheel clutch can guarantee not to take place the interference problem between the normal unblock and the redundant unblock two.
The overrunning clutch mainly comprises an inner planetary flywheel 1, an outer ring transmission mechanism and an inner and outer ring transmission positioning mechanism, wherein the inner planetary flywheel 1, the outer ring transmission mechanism and the inner and outer ring transmission positioning mechanism form the overrunning clutch with the inner ring (the inner planetary flywheel 1) capable of realizing overrunning motion.
The inner planetary flywheel 1 is formed by transforming a flywheel nut of an existing non-self-locking thread space unlocking device, the top of the inner planetary flywheel 1 is circumferentially limited through a limiting boss, the inner planetary flywheel 1 is connected with a bearing screw of the non-self-locking thread space unlocking device in a non-self-locking mode (namely, the inner planetary flywheel 1 is connected with the bearing screw through the non-self-locking thread, the bearing screw is in the prior art and not shown in the figure), the middle of the inner planetary flywheel 1 is connected with a star wheel outer ring 11 in a clamping mode through a cylindrical roller 12 in a non-overrunning state, and the upper portion of the inner planetary flywheel 1 and a transmission shell 3 form axial positioning through a thrust roller bearing 2. The inner planetary flywheel 1 can realize the joint and the overrunning with the star wheel outer ring 11 driven by the flat spiral spring 8 through the rolling of the cylindrical roller 12 in the wedge-shaped groove of the inner planetary flywheel 1, thereby ensuring the unlocking reliability of the device. Specifically, the inner planetary flywheel 1 is of a multi-step ring structure, and is provided with a first step 101, a second step 102, a third step 103, a fourth step 104 and a fifth step 105 from bottom to top in sequence, the first step 101 is a lower limiting concave platform of the self-aligning ball bearing 9, the second step 102 is an upper limiting boss of the self-aligning ball bearing 9, the third step 103 is a main body part of the inner planetary flywheel 1, three wedge-shaped grooves are uniformly distributed on the main body part, round holes are drilled in the inner wall of each wedge-shaped groove, the fourth step 104 is a radial limiting boss of the thrust roller bearing 2, and the fifth step 105 is a main body part and the top of the inner planetary flywheel 1 and is provided with a limiting boss. And a non-self-locking spiral groove is arranged in the annular body structure and is in threaded connection with the bearing screw rod.
The outer ring transmission mechanism is composed of a star wheel outer ring 11 and a lower mounting seat 10, the star wheel outer ring 11 is of a circular ring-shaped structure, an annular bulge is arranged at the bottom end of the star wheel outer ring, at least six threaded holes I are uniformly distributed, bolts are connected in the threaded holes I in a matched mode, and the bolts are connected with threaded holes II arranged at the upper end of the lower mounting seat 10 in a matched mode. The star wheel outer ring 11 is an outer ring of the overrunning clutch, is in clamping connection with the inner planet flywheel 1 through the cylindrical roller 12 in a non-overrunning state, achieves circumferential transmission through the annular protrusion and the lower mounting seat 10, and achieves axial positioning through the bolt and the lower mounting seat 10. The inner ring of the lower mounting seat 10 and the inner planetary flywheel 1 realize radial positioning and transmission through two self-aligning ball bearings 9, and the bottom realizes axial positioning and transmission through the thrust needle bearing 4. Specifically, the lower mounting seat 10 is of an i-shaped annular structure, an annular concave table is arranged at the upper end of the lower mounting seat, and the annular concave table is matched with an annular bulge of the star wheel outer ring 11 through the bolt and fastened to transmit torque; the top of the inner ring of the lower mounting seat 10 is provided with an annular boss for limiting the axial positioning of the self-aligning ball bearing 9, the lower part of the inner ring is provided with an annular groove for limiting the positioning of the outer bearing positioning ring 5 so as to realize the axial positioning of the self-aligning ball bearing 9, and the bottom end of the lower mounting seat 10 is provided with a thin-wall annular structure for limiting the radial positioning of the thrust needle roller bearing 4; the outer ring of the lower mounting seat 10 is provided with an annular deep groove, and the annular deep groove is connected with the flat spiral spring 8.
The transmission positioning mechanism between the inner ring and the outer ring is composed of a cylindrical roller 12, a roller spring stop block 13, a thrust needle bearing 4, two self-aligning ball bearings 9, a bearing stop block 6, an inner bearing positioning ring 7 and an outer bearing positioning ring 5, and realizes positioning of the self-aligning ball bearings 9 and transmission between the inner ring and the outer ring of the overrunning clutch. The cylindrical roller 12 is connected with the roller spring stop block 13, the outer surface of the cylindrical roller is in contact connection with the star wheel outer ring 11, the top of the cylindrical roller is in contact connection with the inner planetary flywheel 1, and the bottom of the cylindrical roller is in contact connection with the lower mounting seat 10; the roller spring stop block 13 consists of a cylindrical hollow sleeve and a spring, one end of the spring is fixed in a circular hole on the inner wall of the wedge-shaped groove of the inner planetary flywheel 1, the other end of the spring is fixed in the cylindrical hollow sleeve to realize axial extension of the cylindrical hollow sleeve, and the top end of the cylindrical hollow sleeve pushes the cylindrical roller 12 between the inner planetary flywheel 1 and the star wheel outer ring 11 through the elasticity of the spring so as to realize contact connection of the three; the cylindrical hollow sleeve is a double-layer cylinder, the lower layer cylinder is a cylindrical cavity, and the top of the upper layer cylinder is provided with an arc-shaped groove which is connected with the cylindrical roller 12; one end of the spring is fixed in the cylindrical cavity, and the other end of the spring is fixed in a circular hole in the inner wall of the wedge-shaped groove of the inner planetary flywheel 1. In addition, the cylindrical roller 12 and the roller spring stop block 13 are in non-fixed connection, namely the outer surface of the cylindrical roller 12 is movably connected with the arc-shaped groove, the cylindrical roller 12 can rotate, belongs to a movable part and is mainly used for connecting an inner ring and an outer ring of the overrunning clutch. At first, the cylindrical roller 12 is pushed by the roller spring stop block 13 in the narrow groove of the wedge-shaped groove to be connected with the inner ring and the outer ring of the overrunning clutch, so that the anticlockwise motion of the outer ring and the clockwise motion of the inner ring can be transmitted, when the inner ring rotates anticlockwise, the cylindrical roller 12 can overcome the spring force by means of inertia to roll to the wide groove of the wedge-shaped groove, and the inner ring and the outer ring of the overrunning clutch are separated from contact.
The thrust needle roller bearing 4 is installed between the bottom of the outer ring of the lower installation seat 10 and the transmission shell 3, the two self-aligning ball bearings 9 are installed in parallel from top to bottom between the outer ring of the inner planetary flywheel 1 and the inner ring of the lower installation seat 10, the bottom end of the self-aligning ball bearing 9 located below is in contact connection with the bearing stop block 6, the bottom end of the bearing stop block 6 is connected with the inner bearing positioning ring 7, the inner bearing positioning ring 7 is arranged in an annular groove in the outer ring of the inner planetary flywheel 1, and the outer bearing positioning ring 5 is installed in an annular groove in the lower portion of the inner ring of the lower installation seat 10.
The thrust needle roller bearing 4 and the thrust roller bearing 2 are axial positioning and transmission parts; the self-aligning ball bearing 9 is a radial positioning and transmission part; the bearing stop block 6, the outer bearing positioning ring 5 and the inner bearing positioning ring 7 are axial positioning pieces of the self-aligning ball bearing 9.
The spiral spring 8 is formed by rolling a rectangular metal strip. When loading, the inner planetary flywheel 1 is rotated to wind the spiral spring 8, the inner planetary flywheel 1 can store torque after being fixed, and the spiral spring 8 can be automatically recovered after the inner planetary flywheel 1 is unlocked to be fixed.
The transmission shell 3 is a cylindrical shell structure with mounting holes at the top and the bottom, and is internally provided with a T-shaped annular cavity for accommodating the planar spiral spring 8 and the overrunning clutch, namely the planar spiral spring 8, the star wheel outer ring 11, the lower mounting seat 10, the inner planetary flywheel 1 and other components are arranged in the transmission shell.
Example 1
As shown in fig. 1 to 9, a redundant driving mechanism for a non-self-locking threaded space unlocking device belongs to a component of an existing non-self-locking threaded space unlocking device, and comprises a cavity structure consisting of a star wheel outer ring 11 and a lower mounting seat 10, an inner planetary flywheel 1, a cylindrical roller 12, a roller spring stop block 13, a thrust roller bearing 2, a thrust needle roller bearing 4, a self-aligning ball bearing 9, a bearing stop block 6, an inner bearing positioning ring 7, an outer bearing positioning ring 5, a flat spiral spring 8 and a transmission housing 3.
The inner planetary flywheel 1 is circumferentially limited through a limiting boss of a fifth step on the top, the inner planetary flywheel 1 is connected with a bearing screw rod in a non-self-locking thread space unlocking device in a non-self-locking mode, the middle portion of the inner planetary flywheel is connected with a star wheel outer ring 11 in a clamping mode through a cylindrical roller 12, and the star wheel outer ring 11 is axially positioned with a transmission shell 3 through a thrust roller bearing 2.
The roller spring stop block 13 is fixed in the end surface of the inner side of the wedge-shaped groove of the inner planetary flywheel 1.
The cylindrical roller 12 is in a cylindrical structure and is tightly clamped in a wedge-shaped cavity formed by the inner planetary flywheel 1 and the star wheel outer ring 11 through a roller spring stop block 13.
The self-aligning ball bearing 9 is fixed in an annular cavity formed by the inner planet wheel 1 and the lower mounting seat 10 through the bearing stop 6, the outer bearing positioning ring 5 and the inner bearing positioning ring 7. The outer bearing positioning ring 5 and the inner bearing positioning ring 7 are elastic retainer rings with different diameters for bearings, and the bearing stop 6 is of a backing ring structure.
The upper end of the lower mounting seat 10 is coaxially matched with the star wheel outer ring 11 through bolts, and the lower end of the lower mounting seat is axially positioned and circumferentially rotated through the thrust needle roller bearing 4.
The inner ring of the spiral spring 8 is fixed to the outer ring of the lower mounting seat 10, and the outer ring is fixed to the inner ring of the transmission housing 3. The spiral spring 8 is a spiral spring wound by an elastic material with a long and thin rectangular cross section based on an Archimedes spiral line, when the spiral spring works, one end of the outer ring of the spiral spring 8 is fixed on the inner ring of the transmission shell 3, and the other end (the end part of the inner ring) acts with torque and is fixed on the outer ring of the lower mounting seat 10 of the overrunning clutch. Before assembly, the inner planetary flywheel 1 is rotated to apply torque to the flat spiral spring 8 to enable the flat spiral spring 8 to be screwed on the outer ring of the lower mounting seat 10, and after the torque is applied, the flat spiral spring 8 generates torsional deformation in a plane to store the torque, so that energy storage is completed; meanwhile, the flat spiral spring 8 has a recovery trend, the trend has a trend of driving the lower mounting seat 10 to rotate so as to drive the inner planetary flywheel 1 to rotate, but the rotation of the inner planetary flywheel 1 is limited due to the existence of the trigger mechanism of the non-self-locking thread space unlocking device, so that the energy of the flat spiral spring 8 cannot be released; when the device needs to be unlocked, the limit of the triggering mechanism to the inner planetary flywheel 1 is released, the energy of the flat spiral spring 8 can be smoothly released, and the deformation can be automatically recovered.
The upper end of the transmission shell 3 is connected with the existing trigger mechanism shell through a bolt, and the lower end of the transmission shell is fixed on an existing star plate of the non-self-locking threaded space unlocking device through a bolt (the star plate refers to a satellite, the star plate is a rocket, and the non-self-locking threaded space unlocking device is used for fixedly connecting the satellite and the rocket).
The working process of the invention is as follows:
under the normal working condition of the non-self-locking thread space unlocking device, the inner planetary flywheel 1 is unlocked through non-self-locking force (the non-self-locking force mainly comes from the loading force applied by the existing loading nut connected with the lower end of the bearing screw rod), because the loading force applied by the loading nut is extremely large (the loading force applied by the loading nut comes from pretightening force), the inner planetary flywheel 1 has extremely large acceleration at the moment after the limit is relieved, but because the loading force disappears at the moment of unlocking, the acceleration also quickly attenuates to a stable negative number (generated by frictional resistance moment), at the initial unlocking stage of the device, the inner planetary flywheel 1 and the star wheel outer ring 11 form differential motion, at the moment, the cylindrical rollers 12 which are originally compressed by the roller retainer blocks 13 in the wedge-shaped grooves of the inner planetary flywheel 1 overcome the spring force due to inertia and roll to the wide grooves of the wedge-shaped grooves, the inner planetary flywheel 1 is separated from the star wheel outer ring 11; however, as the speed of the inner planetary flywheel 1 is reduced continuously until the speed is lower than the rotation speed of the star wheel outer ring 11, the inner planetary flywheel 1 is engaged with the star wheel outer ring 11 again to realize the second stage unlocking.
When the non-self-locking thread force of the non-self-locking thread space unlocking device fails, the planar volute spring 8 drives the star wheel outer ring 11 to rotate along the anticlockwise direction after the limit of the top limit boss of the inner planetary flywheel 1 is relieved, the star wheel outer ring 11 can make the cylindrical roller 12 wedged between the star wheel outer ring 11 and the inner planetary flywheel 1 through friction force while rotating, so that the two keep in a joint state, the inner planetary flywheel 1 is driven to rotate in the same rotation direction, and then the unlocking of the device is completed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A non-self-locking threaded space unlocking device redundant driving mechanism is characterized by comprising: the clutch comprises a transmission shell (3), and a plane scroll spring (8) and an overrunning clutch which are arranged in the transmission shell (3), wherein the inner ring of the plane scroll spring (8) is connected with the outer ring of the overrunning clutch, and the outer ring of the plane scroll spring (8) is connected with the transmission shell (3); the normal unlocking is driven by the non-self-locking force of the threaded connection, the redundant unlocking is released and driven by the flat spiral spring (8), and meanwhile, the overrunning clutch ensures that the normal unlocking and the redundant unlocking do not have the interference problem;
the overrunning clutch is composed of an inner planetary flywheel (1), an outer ring transmission mechanism and a transmission positioning mechanism between the inner ring and the outer ring, and the inner ring can realize overrunning motion.
2. The redundant actuating mechanism of non-auto-lock screw thread space unlocking device of claim 1, characterized in that, the inner planetary flywheel (1) is made by the flywheel nut of the non-auto-lock screw thread space unlocking device, is the inner ring of the overrunning clutch, the top of the inner planetary flywheel realizes circumferential spacing through the spacing boss, the inner planetary flywheel (1) forms non-auto-lock connection with the bearing screw of the non-auto-lock screw thread space unlocking device, the middle part forms clamping connection with the star wheel outer ring (11) through the cylindrical roller (12) under the non-overrunning state, the upper part forms axial positioning with the transmission housing (3) through the thrust roller bearing (2);
the inner planetary flywheel (1) is jointed and surpassed with a star wheel outer ring (11) driven by the plane volute spiral spring (8) through the rolling of the cylindrical roller (12) in the wedge-shaped groove of the inner planetary flywheel (1), and the unlocking reliability of the device is further ensured.
3. The non-self-locking threaded space unlocking device redundant drive mechanism of claim 1 or 2, it is characterized in that the inner planetary flywheel (1) is of a multi-step ring body structure, a first step (101), a second step (102), a third step (103), a fourth step (104) and a fifth step (105) are sequentially arranged from bottom to top, the first step (101) is a lower limiting concave platform of the self-aligning ball bearing (9), the second step (102) is an upper limiting convex platform of the self-aligning ball bearing (9), the third step (103) is the main body part of the inner planetary flywheel (1), three wedge-shaped grooves are uniformly distributed on the thrust roller bearing, the inner wall of each wedge-shaped groove is provided with a round hole, the fourth layer of step (104) is a radial limiting boss of the thrust roller bearing (2), the fifth step (105) is the main body part of the inner planetary flywheel (1) and the top of the fifth step is provided with a limiting boss;
and a non-self-locking spiral groove is formed in the annular body structure.
4. The non-self-locking thread space unlocking device redundant driving mechanism is characterized in that the outer ring transmission mechanism is composed of a star wheel outer ring (11) and a lower mounting seat (10), the star wheel outer ring (11) is of a circular ring structure, an annular bulge is arranged at the bottom end of the star wheel outer ring, at least six threaded holes I are uniformly distributed in the star wheel outer ring, bolts are connected in the threaded holes I in a matched mode, and the bolts are connected with threaded holes II formed in the upper end of the lower mounting seat (10) in a matched mode;
the star wheel outer ring (11) is an outer ring of the overrunning clutch, is in clamping connection with the inner planet flywheel (1) through a cylindrical roller (12) in a non-overrunning state, realizes circumferential transmission with the lower mounting seat (10) through the annular bulge, and realizes axial positioning with the lower mounting seat (10) through a bolt;
the inner ring of the lower mounting seat (10) is radially positioned and transmitted with the inner planetary flywheel (1) through two self-aligning ball bearings (9), and the bottom of the lower mounting seat is axially positioned and transmitted through the thrust needle roller bearing (4).
5. The non-self-locking threaded space unlocking device redundant driving mechanism according to claim 4, wherein the lower mounting seat (10) is of an I-shaped annular structure, an annular concave table is arranged at the upper end of the lower mounting seat, and the annular concave table and the annular bulge of the star wheel outer ring (11) are matched and fastened through the bolt to transmit torque;
the top of the inner ring of the lower mounting seat (10) is provided with an annular boss for limiting the axial positioning of the self-aligning ball bearing (9), the lower part of the inner ring is provided with an annular groove for limiting the positioning of the outer bearing positioning ring (5) so as to realize the axial positioning of the self-aligning ball bearing (9), and the bottom end of the lower mounting seat (10) is provided with a thin-wall circular ring structure for limiting the radial positioning of the thrust needle roller bearing (4);
the outer ring of the lower mounting seat (10) is provided with an annular deep groove, and the annular deep groove is connected with the flat spiral spring (8).
6. The redundant actuating mechanism of non-self-locking threaded space unlocking device according to claim 4, characterized in that the transmission positioning mechanism between the inner and outer rings is composed of a cylindrical roller (12), a roller spring stopper (13), a thrust needle bearing (4), two self-aligning ball bearings (9), a bearing stopper (6), an inner bearing positioning ring (7) and an outer bearing positioning ring (5), and realizes the positioning of the self-aligning ball bearings (9) and the transmission between the inner and outer rings of the overrunning clutch;
the cylindrical roller (12) is connected with the roller spring stop block (13), the outer surface of the cylindrical roller is in contact connection with the star wheel outer ring (11), the top of the cylindrical roller is in contact connection with the inner planetary flywheel (1), and the bottom of the cylindrical roller is in contact connection with the lower mounting seat (10); the roller spring stop block (13) consists of a cylindrical hollow sleeve and a spring, one end of the spring is fixed in a circular hole in the inner wall of a wedge-shaped groove of the inner planetary flywheel (1), the other end of the spring is fixed in the cylindrical hollow sleeve to realize axial extension of the cylindrical hollow sleeve, and the top end of the cylindrical hollow sleeve pushes the cylindrical roller (12) between the inner planetary flywheel (1) and the outer ring (11) of the star wheel through the elasticity of the spring to realize contact connection of the three;
the thrust needle roller bearing (4) is installed between the outer ring bottom of the lower installation seat (10) and the transmission shell (3), the two aligning ball bearings (9) are installed in parallel from top to bottom between the outer ring of the inner planetary flywheel (1) and the inner ring of the lower installation seat (10), the bottom of the aligning ball bearing (9) below is connected with the bearing stop block (6), the bottom of the bearing stop block (6) is connected with the inner bearing positioning ring (7), the inner bearing positioning ring (7) is arranged in the annular groove of the outer ring of the inner planetary flywheel (1), and the outer bearing positioning ring (5) is installed in the annular groove of the lower portion of the inner ring of the lower installation seat (10).
7. The non self-locking threaded spatial unlocking device redundant drive mechanism of claim 6 wherein said thrust needle bearing (4) and said thrust roller bearing (2) are axial positioning and transmission members; the self-aligning ball bearing (9) is a radial positioning and transmission part; the bearing stop block (6), the outer bearing positioning ring (5) and the inner bearing positioning ring (7) are axial positioning pieces of the self-aligning ball bearing (9).
8. The redundant actuating mechanism of non-auto-locking threaded space unlocking device of claim 7, wherein the cylindrical hollow sleeve is a double-layer cylinder, the lower layer cylinder is a cylindrical cavity, the top of the upper layer cylinder is provided with an arc-shaped groove, and the arc-shaped groove is connected with the cylindrical roller (12); one end of the spring is fixed in the cylindrical cavity, and the other end of the spring is fixed in a circular hole in the inner wall of the wedge-shaped groove of the inner planetary flywheel (1).
9. The redundant drive mechanism of non self-locking threaded spatial unlocking device of claim 1 wherein the flat spiral spring (8) is made of a rectangular metal strip.
10. The redundant drive mechanism of non-self-locking threaded space unlocking device according to claim 1, wherein the transmission housing (3) is a cylindrical shell structure with mounting holes at the top and bottom, and a T-shaped annular cavity is arranged in the transmission housing for accommodating the flat spiral spring (8) and the overrunning clutch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011218690.XA CN112319854B (en) | 2020-11-04 | 2020-11-04 | Redundant actuating mechanism of non-auto-lock screw thread space unlocking device |
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| CN202011218690.XA CN112319854B (en) | 2020-11-04 | 2020-11-04 | Redundant actuating mechanism of non-auto-lock screw thread space unlocking device |
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| CN113464609B (en) * | 2021-06-03 | 2022-10-28 | 江苏大学 | Anti-impact inertial container based on coaxial series connection of flywheel and spring |
| CN116215896B (en) * | 2022-12-30 | 2023-08-18 | 中国科学院空间应用工程与技术中心 | Rotary platform and operation box for online cabinet |
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| FR2661466B1 (en) * | 1990-04-25 | 1992-08-07 | Aerospatiale Soc Nat Industrielle | QUICK RELEASE LINK MECHANISM, ESPECIALLY FOR USE ON SPACE MACHINES. |
| CN100491758C (en) * | 2007-04-03 | 2009-05-27 | 梁羽翔 | Overrunning clutch device used in vehicle |
| CN101913436B (en) * | 2010-08-06 | 2013-04-24 | 郑钢铁 | Locking-unlocking device driven by two-stage redundancy |
| CN105253332B (en) * | 2015-10-30 | 2017-06-16 | 北京卫星制造厂 | One kind is based on the memory alloy driven big low impact connection separator of carrying |
| CN105711860B (en) * | 2016-02-05 | 2017-10-20 | 大连理工大学 | A kind of non-firer's point type separator of modified |
| CN109080858B (en) * | 2018-08-08 | 2022-03-29 | 上海宇航系统工程研究所 | Low-impact redundant unlocking connection unlocking device |
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