CN110356545B - Locking mechanism for retraction and extension of landing gear of unmanned aerial vehicle - Google Patents
Locking mechanism for retraction and extension of landing gear of unmanned aerial vehicle Download PDFInfo
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- CN110356545B CN110356545B CN201910774780.8A CN201910774780A CN110356545B CN 110356545 B CN110356545 B CN 110356545B CN 201910774780 A CN201910774780 A CN 201910774780A CN 110356545 B CN110356545 B CN 110356545B
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- piston rod
- sleeve
- lock
- screw
- cylinder barrel
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- 230000007246 mechanism Effects 0.000 title claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 5
- 230000033001 locomotion Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 description 12
- 230000009471 action Effects 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 4
- 230000008054 signal transmission Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/02—Undercarriages
- B64C25/08—Undercarriages non-fixed, e.g. jettisonable
- B64C25/10—Undercarriages non-fixed, e.g. jettisonable retractable, foldable, or the like
- B64C25/18—Operating mechanisms
- B64C25/26—Control or locking systems therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Actuator (AREA)
Abstract
The invention discloses a locking mechanism for retraction of an unmanned aerial vehicle landing gear, which comprises a cylinder barrel, a piston rod arranged in the cylinder barrel in a sliding manner and a power assembly for driving the piston rod to move, wherein a through hole is formed in the piston rod along the axis of the piston rod, one end of the piston rod penetrates out of the cylinder barrel, a guide sleeve is arranged between the piston rod and the cylinder barrel, a rod head is connected to the penetrating end of the piston rod, a sliding sleeve in sliding fit with the inner wall of the cylinder barrel is formed at the other end of the piston rod, and the power assembly comprises a motor for providing power and a transmission locking mechanism for guaranteeing stable extension of the piston rod. The whole structure of the invention is smooth in retraction Cheng Xiangdui, simple in mechanical connection relation, reliable in connection and very ingenious in design, the unlocking of the piston rod can be performed only through the rotation of the nut, and the structure has enough supporting strength or rigidity and can bear the impact generated when the landing gear touches the ground.
Description
Technical Field
The invention relates to the field of unmanned aerial vehicle retraction systems, in particular to a locking mechanism for retraction of an undercarriage of an unmanned aerial vehicle.
Background
Landing gear retraction systems are an important component of an aircraft, and the performance of the system directly affects the safety and maneuverability of the aircraft. The landing gear retraction system mainly comprises a retraction actuator cylinder, a retraction position lock, a retraction control mechanism, a control system and the like. Because the impact force of the landing gear contacting the ground is larger after the landing gear is retracted and released in place, the supporting capability of the locking mechanism in the actuating cylinder is very tested, the locking or unlocking action can be flexibly carried out, and the high supporting stability can be maintained after the landing gear is locked or unlocked in place. The existing actuator cylinder locking mechanism mainly comprises two forms of a mechanical lock or a liquid (gas) lock, the liquid (gas) lock is high in manufacturing cost and complex in structure, the existing actuator cylinder locking mechanism is not suitable for small equipment with low cost such as an unmanned aerial vehicle, the existing part of mechanical lock has the defects of complex structure and low stability, and a great improvement space exists.
Disclosure of Invention
The invention aims to provide the locking mechanism for folding and unfolding the landing gear of the unmanned aerial vehicle, which has the advantages of simple structure, ingenious conception and stable and reliable support.
The invention aims at realizing the following technical scheme: the utility model provides an unmanned aerial vehicle undercarriage receive and releases and uses locking mechanism, includes cylinder, slides the piston rod that sets up in the cylinder and the power pack of drive piston rod motion, the piston rod is opened along its axis has the through-hole, and piston rod one end wears out the cylinder and is provided with the uide bushing with between the cylinder, is connected with the pole head on the wear out end of piston rod, the piston rod other end shaping has the sliding sleeve with cylinder inner wall sliding fit, power pack includes motor and transmission locking mechanism, the motor is fixed on the outer wall of cylinder, transmission locking mechanism includes lead screw and suit and the silk cover through screw-thread fit on the lead screw, lead screw one end penetrates to the through-hole of piston rod in, and is connected with the reduction gear between lead screw other end and the motor output, two rings of draw-in hole group around having along its axial processing on the sliding sleeve lateral wall, including two at least draw-in holes in every draw-in hole group, all be provided with the locking piece in every draw-in hole, be provided with two micro-switch that are used for responding to arbitrary front side locking piece and arbitrary rear side locking piece respectively on the cylinder, the silk cover is located the sliding sleeve, and the silk cover promotes the silk to encircle the wall and is used for making a boss of corresponding front side or rear side processing.
Further, the silk cover includes screw and lock sleeve, and screw passes through screw thread cooperation with the lead screw, and the lock sleeve is located between screw and the piston rod, and lock sleeve one end and screw fixed connection, the boss is annular and processing on the outer annular wall of lock sleeve, and the front side locking piece that will be close to the piston rod promotes and drives the piston rod and slide forward when the boss advances, and the rear side locking piece that will be kept away from the piston rod promotes and drives the piston rod and slide backward when the boss retreats.
Further, the lateral wall of cylinder has two response lockholes, and two response lockholes are located the both ends of cylinder respectively, and all clamping holes all are located between two response lockholes, and the arbitrary card hole in the preceding circle clamping hole group can communicate with the response lockhole of front end, and arbitrary card hole in the back circle clamping hole group can communicate with the response lockhole of rear end, the inductive head of two micro-gap switches is located two response lockholes respectively.
Further, oblique angles are chamfered at two sides of a circle of boss machined on the outer annular wall of the lock sleeve, oblique planes matched with the oblique angles are machined at the inner ends of the two lock blocks, which are close to one side of each other, and the outer end parts of the lock blocks are in a smooth spherical shape.
Further, a circle of radial slotted holes are formed in the side annular wall, far away from the nut, of the lock sleeve and close to the end of the lock sleeve, steel balls are arranged in the radial slotted holes, springs are fixed between the steel balls and the bottom wall of the radial slotted holes, two groups of radial annular grooves are formed in the inner wall of the sliding sleeve, and the two groups of radial annular grooves are located between the piston rod and a locking block close to the piston rod.
Further, the distance between the two sets of radial annular grooves is less than or equal to the distance between the two locking pieces.
According to the invention, the motor drives the screw on the screw rod to move and the lock sleeve to move along with the screw, the boss on the lock sleeve pushes the lock block on the corresponding side to move, the lock block on the other side is driven to withdraw from the rear end annular groove of the inner wall of the cylinder barrel and move along with the rear end annular groove, meanwhile, the lock block is separated from the micro switch to indicate that the piston rod starts to stretch, after the piston rod stretches in place, the lock block on the other side enters the front end annular groove of the inner wall of the cylinder barrel and forms a stretching locking state, and meanwhile, the lock block is contacted with the micro switch on the front end to indicate that the lock block stretches in place. And the unlocking and the recovery locking flow in the recovery process can be realized in the same way. The whole retractable Cheng Xiangdui is smooth, the mechanical connection relationship is simple, the connection is reliable, the design is very ingenious, the unlocking of the piston rod can be performed only through the rotation of the nut, the sufficient supporting strength or rigidity is provided, and the impact generated when the landing gear touches the ground can be born. In addition, the transmission locking mechanism has high popularization value when applied to the actuator cylinder of the landing gear of the unmanned aerial vehicle, can greatly reduce the manufacturing cost of the actuator cylinder and has very reliable stability, and the transmission locking mechanism can also be applied to the fields of mechanical telescopic members except the landing gear of the unmanned aerial vehicle and the landing gear of an airplane and has good application prospect.
Drawings
FIG. 1 is a front cross-sectional view of the present invention;
FIG. 2 is a top cross-sectional view of the present invention;
Fig. 3 is an enlarged schematic view at a of fig. 1.
The marks in the figure: 1-a motor; a 2-speed reducer; 3-a screw rod; 4-cylinder barrel; 5-a guide sleeve; 6-a piston rod; 7-a club head; 8-a micro switch; 9-a drive lock mechanism; 61-sliding sleeve; 62-radial annular groove; 91-nut; 92-lock sleeve; 93-locking piece; 94-a spring; 95-steel ball; 96-radial slots; 97-boss.
Detailed Description
As shown in fig. 1 to 3, the locking mechanism for retraction of the landing gear of the unmanned aerial vehicle provided by the embodiment comprises a cylinder 4, a piston rod 6 slidably arranged in the cylinder 4 and a power assembly for driving the piston rod 6 to move, wherein a through hole is formed in the piston rod 6 along the axis of the piston rod, a guide sleeve 5 is arranged between one end of the piston rod 6 and the cylinder 4, a rod head 7 for connecting other components is fixed in the through hole at the penetrating end of the piston rod 6, a sliding sleeve 61 in sliding fit with the inner wall of the cylinder 4 is formed at the other end of the piston rod 6, the outer diameter of the sliding sleeve 61 is 1.5-2.5 times, preferably 2 times, the inner diameter of the sliding sleeve 61 is 1.5-2.5 times, preferably 2 times, the diameter of the through hole of the piston rod 6, and thus higher connection support strength can be ensured. The power assembly comprises a motor 1 and a transmission locking mechanism 9, the motor 1 is fixed on the outer wall of one end of the cylinder barrel 4, far away from the club head 7, the transmission locking mechanism 9 comprises a screw rod 3 and a screw sleeve sleeved on the screw rod 3 and in threaded fit, one end of the screw rod 3 rotatably penetrates into a through hole of a piston rod 6, a speed reducer 2 is connected between the other end of the screw rod 3 and the output end of the motor 1, the speed reducer 2 is a gear reducer, the output rotating speed of the motor 1 drives the screw rod 3 to rotate after being reduced by a multi-stage gear, the purpose of better reduction is achieved, and one end of the screw rod 3, far away from the club head 7, is in running fit with the inner wall of the cylinder barrel 4 through a bearing to form a stable rotating support.
In this embodiment, the screw sleeve is located in the sliding sleeve, the screw sleeve includes a cylindrical screw 91 and a lock sleeve 92, the screw 91 is in threaded fit with the screw rod 3, the lock sleeve 92 is located between the screw 91 and the piston rod 6, one end of the lock sleeve 92 is fixedly connected with the end surface of the screw 91 through a bolt, the screw rod 3 rotates and drives the screw 91 and the lock sleeve 92 to rotationally move thereon, so that the lock sleeve 92 slowly moves and contacts with the side wall of the sliding sleeve 61 connected with the piston rod 6, and the piston rod 6 is driven to slide forward. In order to judge whether piston rod 6 moves ahead and put in place, specifically, processing has two rings of draw-in hole groups around on the lateral wall of sliding sleeve 61 along its axial, in this embodiment, all include six draw-in holes in every ring draw-in hole group, six draw-in holes evenly distributed in every ring draw-in hole group are on the lateral wall of sliding sleeve 61, and two rings of draw-in hole groups are arranged around on the lateral wall of sliding sleeve 61 and the arrangement mode is the same, and every draw-in hole all is provided with locking piece 93, processing has two response lockholes on the lateral wall of cylinder 4, and two response lockholes are located the front and back both ends of cylinder 4 respectively, all draw-in holes in two rings of draw-in hole groups are located between two response lockholes all the time, be provided with two micro-gap switches 8 that are used for responding to arbitrary front side locking piece 93 and arbitrary rear side locking piece 93 respectively on cylinder 4, front side locking piece 93 indicates the locking piece 93 that is arranged in the lateral wall of sliding sleeve 61, rear side locking piece 93 indicates that is arranged in the rear ring locking piece group, and the inside the corresponding to one of the two front and back locking piece 93 is located in the front and back end of the corresponding to one of the two response lockholes 8, can move into the front and back end of the corresponding one of the two response lockholes 8 in the front and the corresponding lock hole, and the front and back end of the two response holes can be located in the front and one of the corresponding lock hole 8.
The outer annular wall of the lock sleeve 92 is provided with a boss 97 for pushing the corresponding front side or rear side lock block 93 back and forth, specifically, the boss 97 is annular and is processed on the outer annular wall of the middle part of the lock sleeve 92, the two sides of the boss 97 are respectively chamfered, the inner ends of the front end lock block 93 and the rear end lock block 93, which are close to each other, are respectively processed with a bevel matched with the bevel, the outer end part of the lock block 93 is in a smooth spherical shape, when the lock sleeve 92 slides forwards, namely, the boss 97 pushes the lock block 93 close to the piston rod 6 by utilizing the abutting action of the bevel, the other side lock block 93 is separated from the pressing and following movement of the boss 97, and can be easily brought out of an inductive lock hole and move along with the boss, when the screw 91 and the lock sleeve 92 move forwards, the whole piston rod 6 is driven to slide forwards by the action of the mutual abutting of the lock sleeve 92 and the bottom wall of the slide sleeve 61, when the piston rod 6 moves forwards, the lock block 93 close to the piston rod 6 falls into the inductive head of the end of the rod 7, the lock block 93 and the inductive motor 8 form a signal transmission cable, namely, the signal transmission cylinder is released from the control cylinder 1 to the control cylinder is pulled backwards until the control cylinder is pulled forwards, and the signal transmission cylinder is correspondingly extended, and the lock hole is formed, and the signal cylinder is correspondingly extended, and the lock hole is pulled backwards, and the control cylinder is pulled, and the signal cylinder is correspondingly moved, and the signal cylinder is pulled, and the signal driver is pulled, and the signal is a signal driver, and the signal driver is a signal driver and a signal, and a signal driver.
In order to increase the rotary sliding fluency of the lock sleeve 92 in the sliding sleeve 61, a circle of radial slots 96 is processed on the side annular wall of the lock sleeve 92 far away from the screw 91 and close to the end part of the lock sleeve, the number of the radial slots 96 is preferably four, the four radial slots 96 are uniformly arranged in a ring shape along the side wall of the sliding sleeve 61, steel balls 95 for clamping are arranged in each radial slot 96, a spring 94 is fixed between each steel ball 95 and the bottom wall of the radial slot 96, two groups of radial annular grooves 62 are processed on the inner wall of the sliding sleeve 61, the steel balls and the radial annular grooves 62 can form a structure similar to a ball bearing, the fluency clamping property of mechanical movement is increased, the two groups of radial annular grooves 62 are both positioned between the piston rod 6 and the locking blocks 93 close to the piston rod 6, the distance between the two groups of radial annular grooves 62 is smaller than or equal to the distance between the two locking blocks 93, in this embodiment, the distance between the two sets of radial annular grooves 62 is preferably equal to the distance between the two locking blocks 93, when the initial state is the retracted state, the boss 63 presses the locking blocks 93 far away from the piston rod 6 into the corresponding sensing lock holes, waits for the signal of starting the motor 1, and makes the lock sleeve 92 move forward after the motor 1 rotates forward, so as to drive all the locking blocks 93 at the front side and the rear side to move forward along the inner wall of the cylinder 4, the micro switch 8 at the rear end is separated from the start of the extending action, after the piston rod 6 moves forward in place, all the locking blocks at the front side fall into the annular grooves machined at the front end of the inner wall of the cylinder 4, at this time, the nut 91 keeps moving forward until the boss 97 stably presses all the locking blocks 93 at the front side into the annular grooves, at this time, one of the locking blocks 93 at the front end falls into the sensing lock holes at the front end to form sensing with the micro switch 8 at the front end, indicating that the extending is locked in place, the extending state is the same as the extending locking state between the cylinder 4 and the piston rod 6, the motor 1 is controlled to rotate reversely, the lock sleeve 92 is retracted, all lock blocks 93 on the front side and the rear side are driven to retract along the inner wall of the cylinder barrel 4 until the boss 97 stably presses all lock blocks 93 on the rear side into an annular groove formed in the rear end of the inner wall of the cylinder barrel 4, at the moment, one lock block 93 on the rear end falls into an induction lock hole on the rear end, the micro switch 8 on the rear end senses and sends out an in-place signal, a retraction locking state is achieved between the cylinder barrel 4 and the piston rod 6, and accordingly the phenomenon of sliding of an actuator barrel in the retraction state is prevented.
The foregoing is merely a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification and substitution based on the technical scheme and the inventive concept provided by the present invention should be covered in the scope of the present invention.
Claims (3)
1. The utility model provides an unmanned aerial vehicle undercarriage receive and releases and uses locking mechanism, includes cylinder, slides the piston rod that sets up in the cylinder and the power pack of drive piston rod motion, its characterized in that: the piston rod is provided with a through hole along the axis, one end of the piston rod penetrates out of the cylinder barrel and a guide sleeve is arranged between the piston rod and the cylinder barrel, the penetrating end of the piston rod is connected with a rod head, the other end of the piston rod is provided with a sliding sleeve which is in sliding fit with the inner wall of the cylinder barrel, the power assembly comprises a motor and a transmission locking mechanism, the motor is fixed on the outer wall of the cylinder barrel, the transmission locking mechanism comprises a screw rod and a screw sleeve which is sleeved on the screw rod and is in threaded fit, one end of the screw rod penetrates into the through hole of the piston rod, a speed reducer is connected between the other end of the screw rod and the output end of the motor, a front clamping hole group and a rear clamping hole group are machined on the side wall of the sliding sleeve along the axial direction of the screw rod, each clamping hole group comprises at least two clamping holes, each clamping hole is provided with a locking block, the cylinder barrel is provided with two microswitches which are respectively used for sensing any front locking block and any rear locking block, the screw sleeve is positioned in the sliding sleeve, a boss for pushing the corresponding front side or rear side locking piece back and forth is processed on the outer annular wall of the screw sleeve, the screw sleeve comprises a screw nut and a lock sleeve, the screw nut is matched with the screw rod through threads, the lock sleeve is positioned between the screw nut and the piston rod, one end of the lock sleeve is fixedly connected with the screw nut, the boss is annular and is processed on the outer annular wall of the lock sleeve, the front side locking piece close to the piston rod is pushed and drives the piston rod to slide forwards when the boss advances, the rear side locking piece far away from the piston rod is pushed and drives the piston rod to slide backwards when the boss retreats, two induction lock holes are processed on the side wall of the cylinder barrel, the two induction lock holes are respectively positioned at two ends of the cylinder barrel, all the clamping holes are positioned between the two induction lock holes, any clamping hole in the front ring clamping hole group can be communicated with the induction lock hole at the front end, any one of the clamping holes in the rear ring clamping hole group can be communicated with the sensing lock hole at the rear end, the sensing heads of the two micro switches are respectively positioned in the two sensing lock holes, bevel angles are chamfered at two sides of a round of boss machined on the outer annular wall of the lock sleeve, bevel faces matched with the bevel angles are machined at the inner ends of the two locking blocks, which are close to one side of each other, and the outer end parts of the locking blocks are in a smooth spherical shape.
2. The locking mechanism for retraction of an unmanned aerial vehicle landing gear according to claim 1, wherein: a circle of radial slotted holes are formed in the side annular wall, far away from the nut, of the lock sleeve and close to the end of the lock sleeve, steel balls are arranged in the radial slotted holes, springs are fixed between the steel balls and the bottom wall of the radial slotted holes, two groups of radial annular grooves are formed in the inner wall of the sliding sleeve, and the two groups of radial annular grooves are located between the piston rod and a locking block close to the piston rod.
3. The locking mechanism for retraction of an unmanned aerial vehicle landing gear according to claim 2, wherein: the distance between the two groups of radial annular grooves is smaller than or equal to the distance between the two locking blocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910774780.8A CN110356545B (en) | 2019-08-21 | 2019-08-21 | Locking mechanism for retraction and extension of landing gear of unmanned aerial vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910774780.8A CN110356545B (en) | 2019-08-21 | 2019-08-21 | Locking mechanism for retraction and extension of landing gear of unmanned aerial vehicle |
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| Publication Number | Publication Date |
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| CN110356545A CN110356545A (en) | 2019-10-22 |
| CN110356545B true CN110356545B (en) | 2024-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910774780.8A Active CN110356545B (en) | 2019-08-21 | 2019-08-21 | Locking mechanism for retraction and extension of landing gear of unmanned aerial vehicle |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110758724B (en) * | 2019-11-12 | 2021-01-01 | 中航飞机起落架有限责任公司 | Self-locking mechanism for landing gear down position of airplane |
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| CN110356545A (en) | 2019-10-22 |
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