Lifting landing gear for model airplane

Abstract

The lifting undercarriage for the model airplane comprises a support, a motor assembly is installed in the support, a shifting fork is rotationally connected to the support, the motor assembly is in transmission connection with the shifting fork, and a limiting structure used for limiting the rotating angle of the shifting fork is arranged in the support. The device further comprises a controller, the controller is electrically connected with an output module, the output module is electrically connected with a motor assembly and a current detection module, the current detection module is electrically connected with a comparison module, the comparison module is electrically connected with the controller, and a maximum current threshold value is preset in the comparison module. Certainly, the current detection module detects the current value in the output module at any time and sends the value to the comparison module, when the current value generated by stalling of the motor assembly reaches a preset threshold value in the comparison module, the comparison module sends a signal to the controller, and the output module stops outputting through the controller. The motor assembly stops running; and the motor is prevented from being burnt due to stalling.

Description

Technical Field

[0001] The utility model belongs to the technical field of flying model lifting tools, in particular to a lifting landing gear for aviation models. Background Art

[0002] High-end aviation models are basically proportionally reduced in size to restore the shape of fighter jets or other aircraft. These aviation models are basically powered and can fly in the air at a very high speed. Therefore, they also need to be equipped with reliable landing gear. In order to reduce the resistance generated during flight, the landing gear can usually be stored inside the aircraft. Usually, the landing gear uses a motor as a power source to drive the bracket to rotate a certain angle to complete the extension and storage state. In order to prevent the motor from stalling, touch switches are usually provided at two positions. When the bracket rotates to a certain angle, it contacts the touch switch at the corresponding position, and then sends a signal to the controller to stop the motor. However, during the long-term use of the model aircraft, it will be stuck instantly, that is, the bracket has not rotated to the corresponding position, and it is stuck and cannot rotate, causing the motor to output all the time, causing the motor to stall for a long time and cause burning. Utility Model Content

[0003] The purpose of the utility model is to provide a lifting landing gear for an aircraft model to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A lifting landing gear for an aircraft model comprises a bracket, a motor assembly and a shift fork rotatably connected are installed in the bracket, the motor assembly is transmission-connected with the shift fork, and a limit structure for limiting the rotation angle of the shift fork is provided in the bracket;

[0006] It also includes a controller, the controller is electrically connected to an output module, the output module is electrically connected to a motor component and a current detection module, the current detection module is electrically connected to a comparison module, the comparison module is electrically connected to the controller, and a maximum current threshold is preset in the comparison module.

[0007] According to a further technical solution, the limiting structure includes a push block connected to the output end of the motor assembly, a movable groove for cooperating with the push block is provided at the fork, and a limiting block is included in the bracket, and the limiting block can contact the outer side of the fork.

[0008] According to a further technical solution, a buffer connecting rod is fixedly disposed at one end of the shift fork away from the movable groove, and a pulley is disposed at the end of the buffer connecting rod.

[0009] According to a further technical solution, the pulley includes a wheel hub and a wheel skin, an annular groove is provided along the circumference of the wheel hub, at least one arc-shaped movable part is provided in the groove, two sides of the movable part respectively form a clamping position with two sides of the wheel hub, and the two side edges of the inner diameter of the wheel skin are respectively placed in the clamping position.

[0010] According to a further technical solution, the movable part is one in number and circular in shape, arranged around the first groove, and its bottom is in contact with the bottom of the first groove.

[0011] According to a further technical solution, the latching position is in a "T" shape.

[0012] According to a further technical solution, a second annular groove is provided on the movable part.

[0013] According to a further technical solution, the wheel hub comprises a wheel frame, a mounting position for the rotating shaft to pass through is provided in the middle of the wheel frame, two bearings spaced apart are fixed in the mounting position, and a removable circular baffle is provided on one side of the wheel frame.

[0014] According to a further technical solution, the outer edge of the circular baffle is combined with the movable part to form one of the locking positions.

[0015] According to a further technical solution, a receiving cavity is provided on one side of the wheel hub, a brake disc and a fixing frame are respectively provided in the receiving cavity relative to each other, the brake disc is fixedly connected to the wheel hub, the fixing frame moves relative to the wheel hub, and a stator assembly for generating a magnetic field is installed therein.

[0016] Beneficial effects of the utility model:

[0017] Regardless of whether the landing gear is being stored or deployed, as long as the shift fork is stuck, the motor assembly will remain in the output state. At this time, the motor assembly will be stuck. During this process, the current of the motor assembly will gradually increase. Of course, the current detection module will always detect the current value in the output module and send the value to the comparison module. When the current value generated by the motor assembly stalling reaches the preset threshold in the comparison module, the comparison module will send a signal to the controller, which will stop the output module from outputting and stop the motor assembly from running, so as to prevent the motor from burning out due to stalling.

[0018] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 : The utility model landing gear, buffer connecting rod and pulley combined structure diagram.

[0020] Figure 2 : The landing gear structure diagram of the utility model.

[0021] Figure 3 : Logic operation flow chart of the motor assembly of the utility model.

[0022] Figure 4 : A sectional view of a pulley of the utility model.

[0023] Figure 5 : A three-dimensional cross-sectional view of a pulley of the present utility model.

[0024] Figure 6 : Disassembly diagram of the pulley of the utility model.

[0025] Figure markings: 1- pulley, 11- wheel hub, 111- wheel frame, 112- mounting position, 113- bearing, 114- circular baffle, 115- groove one, 116- accommodating chamber, 12- wheel skin, 13- movable part, 131- groove two, 14- clamping position, 15- rotating shaft, 161- brake disc, 162- fixing frame, 163- stator assembly, 21- bracket, 22- motor assembly, 23- fork, 241- push block, 242- movable groove, 243- limit block, 25- buffer connecting rod. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] Please refer to Figure 1-6 ;

[0028] The lifting and landing gear described in the utility model can realize the restart and stop of the motor during use to prevent the motor from being blocked and burned; it specifically includes a bracket 21, which is installed in the aircraft and is in a fixed state during use. A motor assembly 22 and a fork 23 are installed in the bracket 21 for rotation connection. Preferably, the fork 23 and the bracket 21 are made of aluminum alloy; the motor assembly 22 is transmission-connected with the fork 23. In this embodiment, the motor assembly 22 can be a combination of a motor body, a reduction gear and a threaded rod, and its ultimate purpose is to push the fork 23 to reciprocate and rotate a certain angle to achieve the effect of extending and storing. A limit structure for limiting the rotation angle of the fork 23 is provided in the bracket 21 to avoid the fork 23 from rotating too much; in addition, it also includes a controller, the controller is electrically connected to an output module, the output module is electrically connected to the motor assembly 22 and a current detection module, the current detection module is electrically connected to a comparison module, the comparison module is electrically connected to the controller, and a maximum current threshold is preset in the comparison module; the maximum current threshold refers to the maximum current value that the motor can withstand;

[0029] In one of the embodiments, no matter whether the landing gear is being stored or deployed, as long as the shift fork 23 is stuck, the motor assembly 22 will remain in the output state, and the motor assembly 22 will be blocked. During this process, the current of the motor assembly 22 will gradually increase. Of course, the current detection module will always detect the current value in the output module and send the value to the comparison module. When the current value generated by the motor assembly 22 being blocked reaches the preset threshold in the comparison module, the comparison module will send a signal to the controller, and the controller will stop the output module from outputting, so that the motor assembly 22 stops running, so as to avoid the motor burning due to blocking.

[0030] Furthermore, there are many reasons for the fork 23 to get stuck. If some vibrations or other conditions occur during the flight, the fork 23 can operate normally again. Therefore, a timer can be set. When the motor assembly 22 stops running, the timer starts timing. After the time is up, the controller restarts the motor assembly 22. If the motor is still stuck, the motor assembly 22 stops moving again, and the cycle continues.

[0031] Of course, the operation of the motor assembly 22 can be manually stopped in the remote control. The above control method is a temporary emergency plan when the user does not have time to operate. When the user finds the problem, he should control the aircraft to land in other buffered environments for testing.

[0032] In another embodiment, the fork 23 operates normally and may also be blocked under the limitation of the limit structure. At this time, the above method is also applicable to stop the motor assembly 22. Preferably, the angle of motor rotation can be detected to determine whether the fork 23 operates normally and whether it needs to be restarted.

[0033] Preferably, one end of the motor assembly 22 is rotatably connected to the bracket 21, so that the motor assembly 22 has a certain movable space and can finely adjust its position during operation.

[0034] One of the embodiments of the limiting structure of the utility model specifically includes a push block 241 connected to the output end of the motor assembly 22, a movable groove 242 used in conjunction with the push block 241 is provided at the fork 23, and a limit block 243 is provided in the bracket 21, and the limit block 243 can contact the outer side of the fork 23. In this embodiment, the fork 23 is a rotating block with an "obtuse angle", preferably bent at 120°, and the push block 241 is cylindrical and always maintains connection with the movable groove 242. When in the expanded state, the outer side of the fork 23 is against the limit block 243, and the state of the push block 241 forms a limit on the position of the fork 23. At this time, a buffer connecting rod 25 is fixedly provided at one end of the fork 23 away from the movable groove 242, and the buffer connecting rod 25 is in a vertical state;

[0035] When storage is required, the motor assembly 22 pushes the push block 241 forward, and the other end of the corresponding fork 23 will rotate toward the motor assembly 22. After rotating 90°, the fork 23 cannot rotate. At this time, the push block 241 cannot push the fork 23, and the motor assembly 22 is blocked and stops running, or the motor can be stopped by detecting the motor rotation angle.

[0036] In the embodiment of the utility model, a pulley 1 is provided at the end of the buffer connecting rod 25, and the structure of the pulley 1 includes a wheel hub 11 and a wheel skin 12. Preferably, the wheel hub 11 is made of aluminum alloy, and the wheel skin 12 is made of TPU material. An annular groove 115 is provided along the circumference direction of the wheel hub 11, and at least one arc-shaped movable part 13 is provided at the groove 115, wherein the arc-shaped design is mainly used to adapt to the shape of the groove 115, and the two sides of the movable part 13 respectively form a clamping position 14 with the two sides of the wheel hub 11, and the two side edges of the inner diameter of the wheel skin 12 are respectively placed in the clamping position 14; it should be noted that the number of movable parts 13 is not limited in this embodiment, and can be one, two or three, the fewer the better, the fewer the number of movable parts 13, the larger the volume, and the more convenient it can be installed; further, a clamping groove can be provided in the groove 115, and the clamping groove is mainly used to limit the longitudinal displacement of the movable part 13 to prevent it from falling off from the wheel hub 11, but it can still move left and right in the groove 115;

[0037] When installing the wheel skin 12 and the wheel hub 11, first place one side of the inner diameter of the wheel skin 12 in the clamping position 14. Since the movable part 13 can move horizontally in the groove 115, this side of the wheel skin 12 is easier to enter one of the clamping positions 14. Then squeeze the other side of the wheel skin 12 into the other clamping position 14. In this process, the movable part 13 will move toward the fixed side. Although the previous clamping position 14 has been fixed to one side of the wheel skin 12, the wheel skin 12 can be compressed. Therefore, the movable part 13 will squeeze the edge of the wheel skin 12 when moving to the previous clamping position 14, thereby making room for the next clamping position 14, and then cooperate with the wheel skin 12 can be deformed, so that the edge of the other side of the wheel skin 12 can also be placed in another clamping position 14. After both sides of the wheel skin 12 are fixed, the movable part 13 is gradually balanced by the thrust of the edges of the wheel skin 12 on both sides to be located in the middle position of the groove. However, the two sides of the movable part 13 and the two sides of the wheel hub 11 still squeeze the edge position of the wheel hub 11 to form a sealing effect, so that a closed space is formed between the inner cavity of the wheel skin 12 and the wheel hub 11. At this time, there is air in the closed space, so there is no need to perform inflation operation. Of course, you can also refer to the method of the automobile wheel hub 11 in the prior art, and set an air nozzle at the wheel hub 11 for inflation.

[0038] It should be noted that the edge described in the present application refers to the position where the inner diameter of the wheel skin 12 needs to be fixed.

[0039] The utility model sets a movable part 13 in the wheel hub 11, and cooperates with the wheel hub 11 to form a clamping position 14 to achieve two-way fastening of the edge of the wheel skin 12 inside and outside, thereby greatly improving the sealing effect and preventing air leakage. In addition, the force exerted on the wheel skin 12 during the landing of the aircraft is uneven, which will generate stresses of different sizes on the edge of the wheel skin 12 at the fastening position, and the movable part 13 can move slightly laterally inside. When the edge of the wheel skin 12 is affected by the stress generated during the landing process, the movable part 13 can achieve a micro-adjustment effect, thereby reducing the loss caused by the stress generated at the edge of the wheel skin 12 and increasing the service life.

[0040] In the utility model, the number of movable parts 13 is one, and they are circular and arranged around the groove 115, and their bottom is fitted with the bottom of the groove 115. Through such a design, the longitudinal position of the movable part 13 can be limited, and no additional mechanism is required. The overall mechanism is simpler. Preferably, the latch 14 is in a "T" shape or similar to a "T" shape, and the inner diameter edge of the corresponding wheel skin 12 is also in a "T" shape or similar to a "T" shape. The two are adapted to each other and can better fix and achieve a sealing effect. An annular groove 131 is provided on the movable part 13. The design of the groove 131 can make the enclosed space larger, store more gas, and achieve the purpose of reducing weight.

[0041] One embodiment of the wheel hub 11 of the utility model specifically includes a wheel frame 111. A mounting position 112 for the rotation shaft 15 to pass through is provided in the middle of the wheel frame 111. Two bearings 113 arranged at intervals are fixed in the mounting position 112. The bearings 113 are connected to the rotation shaft 15. A detachable circular baffle 114 is provided on one side of the wheel frame 111. The circular baffle 114 is usually located on the outside. Therefore, the circular baffle 114 can also serve as a decorative panel, and the user can replace it according to preference.

[0042] Furthermore, the outer edge of the circular baffle 114 is combined with the movable part 13 to form one of the locking positions 14, that is, after the circular baffle 114 is removed, the movable part 13 can be taken out from the wheel hub 11. When assembling, the circular baffle 114 is removed first. At this time, the movable part 13 has a relatively large range of motion. Then, one side of the edge of the wheel skin 12 is placed behind one of the locking positions 14, and then the edge of the other side of the wheel skin 12 is placed on the other side of the movable part 13. Finally, the circular baffle 114 is locked. The edge of the other side of the wheel skin 12 does not need to be forced into another locking position 14, so the installation is more convenient. Preferably, since there will be a gap at the connection position between the circular baffle 114 and the wheel hub 11, air leakage may occur, so a thinner sealing gasket can be set on the inner side of the circular baffle 114.

[0043] The pulley 1 in the utility model adopts electromagnetic braking, and the specific structure includes a housing cavity 116 on one side of the wheel hub 11, and a brake disc 161 and a fixing frame 162 are respectively arranged in the housing cavity 116, wherein the brake disc 161 is fixedly connected to the wheel hub 11, and the fixing frame 162 moves relative to the wheel hub 11. It should be noted that the fixing frame 162 is usually fixedly connected to the external landing gear, so it will not rotate with the pulley 1. Specifically, the shape of the housing cavity 116 is cylindrical, and the brake pad and the fixing frame 162 are also circular. In order to prevent the entry of foreign objects, the outer edge of the fixing frame 162 and the housing cavity 116 only retain a small gap, and under the limitation of the landing gear and the rotating shaft 15, it will not contact the wheel hub 11. A stator assembly 163 for generating a magnetic field is installed in the fixing frame 162, wherein the stator assembly 163 can be composed of a wire drum and a copper wire wound on the wire drum;

[0044] In one embodiment, the relative positions of the fixing frame 162 and the brake pad are fixed, and by supplying direct current, the stator assembly 163 generates a magnetic field in a fixed direction to produce an adsorption force on the brake pad, thereby hindering its rotation, thereby achieving a deceleration braking effect.

[0045] In another embodiment, the relative positions of the pulley 1 and the rotating shaft 15 are fixed, and the fixing frame 162 is also fixed in the initial state under the action of the lifting frame, and a reset spring is provided between the lifting frame and the fixing frame 162. When braking is required, the stator assembly 163 generates a magnetic field, so that an adsorption force is generated between the stator assembly 163 and the brake pad, so that the fixing frame 162 moves toward the brake pad and is finally fixed to fit the brake pad. Since the fixing frame 162 does not rotate, the wheel hub 11 will stop rotating in a very short time at the moment of engagement, greatly shortening the braking distance. After braking is completed, the magnetic field disappears, and the fixing frame 162 is separated from the brake pad under the action of the reset member.

[0046] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A lifting landing gear for an aircraft model, comprising a bracket (21), a motor assembly (22) and a shift fork (23) being installed in the bracket (21), the motor assembly (22) being transmission-connected to the shift fork (23), a limit structure for limiting the rotation angle of the shift fork (23) being provided in the bracket (21), characterized in that: The invention also includes a controller, wherein the controller is electrically connected to an output module, wherein the output module is electrically connected to a motor component (22) and a current detection module, wherein the current detection module is electrically connected to a comparison module, wherein the comparison module is electrically connected to the controller, and wherein a maximum current threshold is preset in the comparison module.

2. The lifting and landing gear for an aircraft model according to claim 1, characterized in that: The limiting structure comprises a push block (241) connected to the output end of the motor assembly (22), a movable groove (242) provided at the shift fork (23) and used in conjunction with the push block (241), and a limiting block (243) in the bracket (21), wherein the limiting block (243) can contact the outer side of the shift fork (23).

3. The lifting and landing gear for an aircraft model according to claim 1, characterized in that: A buffer connecting rod (25) is fixedly provided at one end of the shift fork (23) away from the movable groove (242), and a pulley (1) is provided at the end of the buffer connecting rod (25).

4. The lifting and landing gear for an aircraft model according to claim 3, characterized in that: The pulley (1) comprises a wheel hub (11) and a wheel skin (12), an annular groove (115) is provided along the circumference direction of the wheel hub (11), at least one arc-shaped movable part (13) is provided at the groove (115), two sides of the movable part (13) respectively form a clamping position (14) with two sides of the wheel hub (11), and the two side edges of the inner diameter of the wheel skin (12) are respectively placed in the clamping position (14).

5. The lifting and landing gear for an aircraft model according to claim 4, characterized in that: The movable part (13) is one in number and circular in shape, arranged around the first groove (115), and its bottom is in contact with the bottom of the first groove (115).

6. The lifting and landing gear for an aircraft model according to claim 4, characterized in that: The clamping position (14) is in a "T" shape.

7. The lifting and landing gear for an aircraft model according to claim 4, characterized in that: The movable member (13) is provided with a second annular groove (131).

8. The lifting and landing gear for an aircraft model according to claim 4, characterized in that: The wheel hub (11) comprises a wheel frame (111), a mounting position (112) for the rotating shaft (15) to pass through is provided in the middle of the wheel frame (111), two bearings (113) arranged at intervals are fixedly arranged in the mounting position (112), and a detachable circular baffle (114) is provided on one side of the wheel frame (111).

9. The lifting and landing gear for an aircraft model according to claim 8, characterized in that: The outer edge of the circular baffle (114) is combined with the movable member (13) to form one of the locking positions (14).

10. The lifting and landing gear for an aircraft model according to claim 4, characterized in that: A receiving cavity (116) is provided on one side of the wheel hub (11), and a brake disc (161) and a fixing frame (162) are respectively arranged in the receiving cavity (116) in opposition to each other; the brake disc (161) is fixedly connected to the wheel hub (11), and the fixing frame (162) moves relative to the wheel hub (11), and a stator assembly (163) for generating a magnetic field is installed therein.

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