阅读说明：本技术 无人机及其机架 (Unmanned aerial vehicle and frame thereof ) 是由 熊荣明 熊贤武 唐尹 徐振华 于 2018-09-14 设计创作，主要内容包括：一种无人机及其机架,涉及一种无人机技术。该无人机(1)包括机架(100)。该机架(100)包括中心体(110),包括机臂连接部(131)以及设置在所述机臂连接部(131)上的限位部(135),所述机臂连接部(131)设置有轴孔(132)；以及机臂(120),包括臂架(121)以及从所述臂架(121)的一端伸出的限位轴(122),所述限位轴(122)插入所述轴孔(132)内,并且能在所述轴孔(132)内旋转；所述限位轴(122)上设有配合部(123),所述臂架(121)远离所述限位轴(122)的一端设有用于承载无人机的动力电机的电机安装部(128),其中,所述机臂(120)相对于所述中心体(110)可转动,使得所述机臂(120)能够选择性地处于折叠状态或伸展状态。(An unmanned aerial vehicle and a frame thereof relate to an unmanned aerial vehicle technology. The unmanned aerial vehicle (1) comprises a frame (100). The rack (100) comprises a central body (110) and a limiting part (135) arranged on a machine arm connecting part (131), wherein the machine arm connecting part (131) is provided with a shaft hole (132); the machine arm (120) comprises an arm support (121) and a limiting shaft (122) extending out of one end of the arm support (121), and the limiting shaft (122) is inserted into the shaft hole (132) and can rotate in the shaft hole (132); the limiting shaft (122) is provided with a matching part (123), one end, away from the limiting shaft (122), of the arm support (121) is provided with a motor mounting part (128) used for bearing a power motor of the unmanned aerial vehicle, wherein the horn (120) can rotate relative to the central body (110), so that the horn (120) can be selectively in a folded state or an extended state.)

1. An unmanned aerial vehicle's frame, its characterized in that includes:

the central body comprises a machine arm connecting part and a limiting part arranged on the machine arm connecting part, wherein the machine arm connecting part is provided with a shaft hole; and

the mechanical arm comprises an arm support and a limiting shaft extending out of one end of the arm support, and the limiting shaft is inserted into the shaft hole and can rotate in the shaft hole; the limiting shaft is provided with a matching part, one end of the arm support far away from the limiting shaft is provided with a motor mounting part for bearing a power motor of the unmanned aerial vehicle,

wherein the horn is rotatable relative to the hub such that the horn is selectively capable of being in a folded condition or an extended condition;

when the folding state is achieved, the machine arm rotates to a position of a first preset angle relative to the central body, and the motor mounting part is close to the edge of the central body;

when the motor mounting part is in the extending state, the horn rotates to a position of a second preset angle relative to the central body, so that the motor mounting part is far away from the edge of the central body;

when the position of the first preset angle or the second preset angle is reached, the limiting part is matched with the matching part, so that the machine arm is stably in the folded state or the extended state.

2. The frame according to claim 1, wherein the position-limiting portion is a position-limiting groove, and the engaging portion is a protrusion engaged with the position-limiting groove.

3. The frame of claim 1, wherein the projection extends radially outward from the retention shaft;

or/and the top of the bulge is provided with a groove, the inner wall of the limit groove is provided with a buckle,

when the protrusion abuts against the limiting groove, the buckle is clamped into the groove.

4. The frame of claim 3, wherein the catch comprises a pawl protruding from a bottom wall of the retaining groove toward the retaining shaft,

the shape of the claw is matched with that of the groove.

5. The frame according to claim 4, wherein the side of the pawl is provided with a guide ramp so that the projection can slide along the guide ramp until the pawl fully engages the groove.

6. The frame according to any one of claims 2 to 5, wherein an escape cavity is provided in the protrusion to facilitate elastic deformation of the protrusion.

7. The frame according to claim 1, wherein the limiting portion is a limiting protrusion, the engaging portion is an engaging protrusion capable of abutting against the limiting protrusion, and the engaging protrusion is stopped by the limiting protrusion when the engaging protrusion passes over the limiting protrusion along with the rotation of the limiting shaft;

or the limiting part is a limiting bulge, the matching part is a matching groove arranged on the limiting shaft, and the limiting bulge can be clamped with the matching groove;

or, the limiting shaft is matched with the shaft hole, so that the machine arm can rotate relative to the central body.

8. The frame as in claim 1, further comprising a hinge having one end connected to the horn and another end connected to the horn connection such that the horn is rotatable relative to the hub.

9. The frame of claim 8, wherein the hinge is a cam hinge, such that the torque applied to the arm changes during the rotation from the first predetermined angular position to the second predetermined angular position.

10. The frame of claim 9, wherein the cam structure has a maximum torque portion that maximizes torque applied to the arm when the arm is rotated to a third predetermined angular position; the third preset angle is positioned between the first preset angle and the second preset angle;

when the machine arm rotates from the position of the first preset angle to the position of the third preset angle, the received torsion force is gradually increased; when the horn rotates from the third preset angle position to the second preset angle position, the received torsion force is gradually reduced.

11. The frame according to claim 9, wherein the first predetermined angle is 0 degrees and the second predetermined angle is equal to or less than 180 degrees.

12. The frame according to claim 8, wherein the horn connecting portion is a cylindrical structure, and a limiting groove which penetrates through the horn connecting portion and extends in the circumferential direction is formed in the horn connecting portion;

the cooperation portion is followed the spacing groove slides, spacing portion sets up the one end of spacing groove, cooperation portion by the inner wall of the other end of spacing groove blocks.

13. The frame according to claim 8, wherein the stopper shaft is provided with a hinge hole, and the hinge is at least partially inserted into the hinge hole.

14. The frame of claim 13, wherein the hinge housing is non-circular in cross-section and the hinge bore is adapted in cross-section to the hinge housing such that the stop shaft rotates with the hinge housing.

15. The frame of claim 12, wherein the central body further comprises a strut, and two ends of the strut are respectively connected across the two sides of the limiting groove.

16. The frame according to claim 14, wherein the hinge is further provided with a spindle and a mounting seat connected to one end of the spindle,

the mounting seat is arranged on the connecting part of the machine arm, the mandrel is inserted into the shaft hole,

the shell is sleeved on the mandrel, and the shell can rotate around the mandrel.

17. The airframe as recited in claim 14, wherein an end of the housing facing the boom extends into the boom and is bolted to the boom.

18. An unmanned aerial vehicle is characterized by comprising a frame, a power motor and a propeller, wherein,

the frame comprises a central body and a machine arm;

the central body comprises a machine arm connecting part and a limiting part arranged on the machine arm connecting part, and the machine arm connecting part is provided with a shaft hole;

the machine arm comprises an arm support and a limiting shaft extending out of one end of the arm support, and the limiting shaft is inserted into the shaft hole and can rotate in the shaft hole; the limiting shaft is provided with a matching part, one end of the arm support far away from the limiting shaft is provided with a motor mounting part for bearing a power motor of the unmanned aerial vehicle,

wherein the horn is rotatable relative to the hub such that the horn is selectively capable of being in a folded condition or an extended condition;

when the folding state is achieved, the machine arm rotates to a position of a first preset angle relative to the central body, and the motor mounting part is close to the edge of the central body;

when the motor mounting part is in the extending state, the horn rotates to a position of a second preset angle relative to the central body, so that the motor mounting part is far away from the edge of the central body;

when the position of the first preset angle or the second preset angle is reached, the limiting part is matched with the matching part, so that the machine arm is stably in the folded state or the extended state;

the power motor is arranged on the motor mounting part;

the propeller is arranged on the power motor;

the power motor drives the propeller to rotate, and provides flying power for the unmanned aerial vehicle.

19. The unmanned aerial vehicle of claim 18, wherein the limiting portion is a limiting groove, and the engaging portion is a protrusion engaged with the limiting groove.

20. A drone according to claim 18, wherein the projection projects radially outwardly from the hold-down shaft;

or/and the top of the bulge is provided with a groove, the inner wall of the limit groove is provided with a buckle,

when the protrusion abuts against the limiting groove, the buckle is clamped into the groove.

21. The drone of claim 20, wherein the catch includes a pawl projecting from a bottom wall of the retaining slot toward the retaining shaft,

the shape of the claw is matched with that of the groove.

22. A drone according to claim 21, wherein the side of the pawl is provided with a guide ramp so that the projection can slide along the guide ramp until the pawl is fully engaged with the groove.

23. An unmanned aerial vehicle as claimed in any of claims 19-22, wherein an escape cavity is provided in the protrusion to facilitate elastic deformation of the protrusion.

24. The unmanned aerial vehicle of claim 18, wherein the limiting portion is a limiting protrusion, and the engaging portion is an engaging protrusion capable of abutting against the limiting protrusion, and when the engaging protrusion passes over the limiting protrusion as the limiting shaft rotates, the engaging protrusion is blocked by the limiting protrusion;

or the limiting part is a limiting bulge, the matching part is a matching groove arranged on the limiting shaft, and the limiting bulge can be clamped with the matching groove;

or, the limiting shaft is matched with the shaft hole, so that the machine arm can rotate relative to the central body.

25. The drone of claim 18, further comprising a hinge connected at one end to the horn and at another end to the horn connection such that the horn is rotatable relative to the hub.

26. An unmanned aerial vehicle as claimed in claim 25, wherein the hinge is a cam hinge, such that torque received by the horn during rotation from the first predetermined angular position to the second predetermined angular position varies.

27. An unmanned aerial vehicle according to claim 26, wherein the cam structure is provided with a maximum torsion portion so that the maximum torsion is applied when the arm rotates to a third predetermined angular position; the third preset angle is positioned between the first preset angle and the second preset angle;

when the machine arm rotates from the position of the first preset angle to the position of the third preset angle, the received torsion force is gradually increased; when the horn rotates from the third preset angle position to the second preset angle position, the received torsion force is gradually reduced.

28. An unmanned aerial vehicle as defined in claim 26, wherein the first predetermined angle is 0 degrees and the second predetermined angle is equal to or less than 180 degrees.

29. The unmanned aerial vehicle of claim 25, wherein the horn connecting portion is a cylindrical structure, and a limiting groove which penetrates through the horn connecting portion and extends in the circumferential direction is formed in the horn connecting portion;

the cooperation portion is followed the spacing groove slides, spacing portion sets up the one end of spacing groove, cooperation portion by the inner wall of the other end of spacing groove blocks.

30. A drone according to claim 25, characterised in that the limit shaft is provided with a hinge hole, the hinge being at least partially inserted in the hinge hole.

31. The drone of claim 30, wherein the cross-section of the hinge housing is non-circular, and the cross-section of the hinge bore is adapted to the cross-section of the hinge housing such that the restraint shaft rotates with the hinge housing.

32. The drone of claim 29, wherein the central body further includes a strut, both ends of the strut respectively bridging the two sides of the slot.

33. A drone according to claim 31, wherein the hinge is further provided with a mandrel and a mount connecting one end of the mandrel,

the mounting seat is arranged on the connecting part of the machine arm, the mandrel is inserted into the shaft hole,

the shell is sleeved on the mandrel, and the shell can rotate around the mandrel.

34. The drone of claim 31, wherein an end of the housing facing the boom extends into the boom and is in screw connection with the boom.

Technical Field

The embodiment of the invention relates to an unmanned aerial vehicle technology.

Background

The unmanned aerial vehicle of a traditional collapsible horn includes the organism and installs the horn on the organism. The horn rotates on the organism in order to realize the expansion and folding of horn and pack up, and the horn needs to be fixed to certain angle after expanding.

A conventional drone includes a horn and a body. The machine body is provided with a hinge, the machine arm is arranged on the hinge, and the hinge enables torsion to be generated between the machine arm and the machine body, and the torsion enables the machine arm to tend to be unfolded or folded, namely the cam hinge is matched with the shaft hole to limit the machine arm. However, the torsion is generally small, and the hip cannot be firmly positioned in a stable state, so that the arm is easy to swing when the arm is unfolded and flies or is stored after the arm is folded, for example, when the unmanned aerial vehicle flies, the arm vibrates due to the influence of the stress of the propeller, and the stability of the unmanned aerial vehicle during flying is poor.

The above information disclosed in this background section is only for enhancement of understanding of the background of the embodiments of the present invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

It is a primary object of embodiments of the present invention to overcome at least one of the above-mentioned drawbacks of the prior art, and to provide a frame of an unmanned aerial vehicle, including:

the central body comprises a machine arm connecting part and a limiting part arranged on the machine arm connecting part, wherein the machine arm connecting part is provided with a shaft hole; and

the mechanical arm comprises an arm support and a limiting shaft extending out of one end of the arm support, and the limiting shaft is inserted into the shaft hole and can rotate in the shaft hole; the limiting shaft is provided with a matching part, one end of the arm support far away from the limiting shaft is provided with a motor mounting part for bearing a power motor of the unmanned aerial vehicle,

wherein the horn is rotatable relative to the hub such that the horn is selectively capable of being in a folded condition or an extended condition;

when the folding state is achieved, the machine arm rotates to a position of a first preset angle relative to the central body, and the motor mounting part is close to the edge of the central body;

when the motor mounting part is in the extending state, the horn rotates to a position of a second preset angle relative to the central body, so that the motor mounting part is far away from the edge of the central body;

when the position of the first preset angle or the second preset angle is reached, the limiting part is matched with the matching part, so that the machine arm is stably in the folded state or the extended state.

According to an exemplary embodiment of the present invention, the position-limiting portion is a position-limiting groove, and the engaging portion is a protrusion engaged with the position-limiting groove.

According to an exemplary embodiment of the present invention, the projection extends radially outward from the spacing shaft;

or/and the top of the bulge is provided with a groove, the inner wall of the limit groove is provided with a buckle,

when the protrusion abuts against the limiting groove, the buckle is clamped into the groove.

According to an exemplary embodiment of the present invention, the catch includes a claw protruding from a bottom wall of the stopper groove toward the stopper shaft,

the shape of the claw is matched with that of the groove.

According to an exemplary embodiment of the invention, the side of the pawl is provided with a guide ramp so that the projection can slide along the guide ramp until the pawl is fully engaged with the recess.

According to an exemplary embodiment of the present invention, an avoiding cavity is provided in the protrusion to facilitate elastic deformation of the protrusion.

According to an exemplary embodiment of the present invention, the position-limiting part is a position-limiting protrusion, the engaging part is an engaging protrusion capable of abutting against the position-limiting protrusion, and when the engaging protrusion passes over the position-limiting protrusion along with the rotation of the position-limiting shaft, the engaging protrusion is blocked by the position-limiting protrusion;

or the limiting part is a limiting bulge, the matching part is a matching groove arranged on the limiting shaft, and the limiting bulge can be clamped with the matching groove;

or, the limiting shaft is matched with the shaft hole, so that the machine arm can rotate relative to the central body.

According to an exemplary embodiment of the present invention, the robot further includes a hinge having one end connected to the horn and the other end connected to the horn connecting portion so that the horn is rotatable with respect to the central body.

According to an exemplary embodiment of the present invention, the hinge is a cam hinge, so that the torsion received by the arm is changed during the rotation from the first preset angle position to the second preset angle position.

According to an exemplary embodiment of the present invention, the cam structure is provided with a maximum torsion portion, so that the maximum torsion is applied when the arm rotates to a third predetermined angle; the third preset angle is positioned between the first preset angle and the second preset angle;

when the machine arm rotates from the position of the first preset angle to the position of the third preset angle, the received torsion force is gradually increased; when the horn rotates from the third preset angle position to the second preset angle position, the received torsion force is gradually reduced.

According to an exemplary embodiment of the present invention, the first predetermined angle is 0 degree, and the second predetermined angle is equal to or less than 180 degrees.

According to an exemplary embodiment of the present invention, the horn connecting portion is a cylindrical structure, and a limiting groove penetrating through the horn connecting portion and extending in a circumferential direction is provided on the horn connecting portion;

the cooperation portion is followed the spacing groove slides, spacing portion sets up the one end of spacing groove, cooperation portion by the inner wall of the other end of spacing groove blocks.

According to an exemplary embodiment of the present invention, the stopper shaft is provided with a hinge hole, and the hinge is at least partially inserted into the hinge hole.

According to an exemplary embodiment of the present invention, the cross section of the hinge housing is non-circular, and the cross section of the hinge hole is adapted to the cross section of the hinge housing, such that the stopper shaft rotates along with the hinge housing.

According to an exemplary embodiment of the present invention, the central body further includes a pillar, and both ends of the pillar are respectively bridged at both sides of the limiting groove.

According to an exemplary embodiment of the invention, the hinge is further provided with a spindle and a mounting seat connected to the spindle,

the mounting seat is arranged on the connecting part of the machine arm, the mandrel is inserted into the shaft hole,

the shell is sleeved on the mandrel, and the shell can rotate around the mandrel.

According to an exemplary embodiment of the present invention, the housing extends into the arm support towards one end of the arm support and is connected to the arm support by screws.

The embodiment of the invention also provides the unmanned aerial vehicle, which comprises the frame; the power motor is arranged on the motor installation part; and the propeller is installed on the power motor, wherein the power motor drives the propeller to rotate, and the unmanned aerial vehicle provides flight power.

According to the technical scheme, the unmanned aerial vehicle has the advantages and positive effects that:

because when the position of angle is predetermine to first predetermined angle or second, spacing portion and cooperation portion cooperate for the horn is stable is in extension state or fold condition, and folding when accomodating or at the in-process that unmanned aerial vehicle expanded the flight can not swing, and the horn is more stable when extending state or fold condition. The frame can meet the requirement of large load when the unmanned aerial vehicle carries out high-power and large-motor navigation.

Drawings

Various objects, features and advantages of embodiments of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention, when considered in conjunction with the accompanying drawings. The drawings are merely exemplary of embodiments of the invention and are not necessarily to scale. In the drawings, like reference characters designate the same or similar parts throughout the different views. Wherein:

fig. 1 is a schematic perspective view of a drone in one embodiment of the invention;

FIG. 2 is a perspective view of the horn folded over the hub in one embodiment of the present invention;

FIG. 3 is a perspective view of the horn deployed on the hub in one embodiment of the present invention;

FIG. 4 is a disassembled schematic view of a frame in one embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a horn connection in an embodiment of the present invention;

fig. 6 is a perspective view of a horn connecting portion according to an embodiment of the present invention.

Wherein the reference numerals are as follows:

1. an unmanned aerial vehicle; 100. a frame; 110. a central body; 120. a horn; 121. a boom; 122. a limiting shaft; 123. a fitting portion; 124. a housing; 125. a hinge; 126. avoiding the cavity; 127. a groove; 128. a motor mounting portion; 131. a boom connecting portion; 132. a shaft hole; 133. a mandrel; 134. a mounting seat; 135. a limiting part; 136. buckling; 137. a bottom wall; 138. a claw; 139. a limiting groove; 140. a pillar; 200. a propeller assembly; 210. a propeller.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

As shown in fig. 1, fig. 1 shows an unmanned aerial vehicle 1 in the present embodiment. The drone 1 comprises a frame 100 and a propeller assembly 200 mounted on the frame 100.

The frame 100 includes a hub 110 and a horn 120. One end of the horn 120 is mounted on the central body 110, and the propeller assembly 200 is mounted on the other end of the horn 120. The propeller assembly 200 includes a power motor mounted on the horn 120 and a propeller 210 mounted on the shaft of the power motor. The motor drives the propeller 210 to rotate to raise the lift frame 100.

The horn 120 is able to rotate relative to the hub 110. As shown in FIG. 2, rotation of the arm 120 in the other direction allows the housing 100 to be folded for easy carrying and storage. As shown in fig. 3, the rotation of the arm 120 in one direction can extend the frame 100, and the drone 1 can take off normally after the frame 100 is unfolded.

As shown in fig. 4 and 5, the central body 110 includes a horn connecting portion 131 and a stopper portion 135. The horn connecting portion 131 may be provided in a substantially cylindrical shape. The horn connecting portion 131 is mounted on the central body 110. The arm connecting portion 131 and the central body 110 may be connected by screws. A shaft hole 132 is provided in the arm connecting portion 131. The shaft hole 132 is a through hole. The shaft hole 132 is preferably a circular hole. The stopper 135 is provided on the arm connecting portion 131.

The arm 120 includes an arm frame 121, a limit shaft 122, and a fitting portion 123. The arm support 121 is straight. One end of the arm support 121 is provided with a motor mounting part 123 for mounting a power motor. The limiting shaft 122 is arranged at the other end of the arm support 121. The limiting shaft 122 extends from the arm support 121. The limiting shaft 122 and the arm support 121 form a certain included angle. The stopper shaft 122 is inserted into the shaft hole 132 of the arm connecting portion 131. The stopper shaft 122 can rotate about its axis in the arm connecting portion 131. The stopper shaft 122 allows the horn 120 to be selectively in a folded state or an extended state when rotated about its axis in the horn connecting portion 131.

In a folded state, the arm 120 rotates to a first predetermined angle with respect to the central body 110, such that the motor mounting portion 123 is close to the edge of the central body; in the extended state, the arm 120 rotates to a second predetermined angle relative to the central body 110, so that the motor mounting portion 123 is away from the edge of the central body. When the position of the first preset angle or the second preset angle is reached, the position-limiting portion 135 is engaged with the engaging portion 123, so that the arm 120 is stably in the folded state or the extended state.

Because when the position of first predetermined angle or second predetermined angle, spacing portion 135 cooperatees with cooperation portion 123 for the horn 120 is stable is in extension state or fold condition, and when unmanned aerial vehicle was folded and accomodate or at the in-process that unmanned aerial vehicle expanded the flight can not swing, and the horn 120 is more stable when extending state or fold condition. The frame can meet the requirement of large load when the unmanned aerial vehicle carries out high-power and large-motor navigation.

In an exemplary embodiment, the position-limiting portion 135 is a position-limiting groove, and the engaging portion 123 is a protrusion that engages with the position-limiting groove. When the protrusion is accommodated in the limiting groove, the limiting groove blocks the protrusion, so that the rotation angle of the machine arm is limited.

Preferably, the mating portion 123 extends radially outward from the stop shaft 122. The fitting portion 123 is preferably provided on the outer peripheral surface of the stopper shaft 122. The fitting portion 123 can rotate following the stopper shaft 122. The stopper portion 135 is disposed on a moving path of the fitting portion 123. When the arm 120 rotates to the first predetermined angle or the second predetermined angle, the positioning portion 135 abuts against the engaging portion 123, and the arm 120 cannot rotate any more.

Because cooperation portion 123 is located the outer peripheral face of spacing axle 122, the arm of force of spacing portion 135 effect torque on cooperation portion 123 is greater than spacing axle radius, and this cooperation portion 123 is longer to the arm of force of spacing axle 122 axis, and cooperation portion 123 can bear bigger torque, can further satisfy the heavy load requirement when unmanned aerial vehicle 1 carries out high power, big motor-driven navigation.

Preferably, the top of the fitting part 123 is provided with a groove 127. The position-limiting portion 135 further includes a catch 136. The catch 136 is connected to the arm connecting portion 131. The catch 136 mates with the groove 127. When the matching portion 123 abuts against the limiting portion 135, the latch 136 is clipped into the groove 127.

The arm support 121 is rotated to enable the matching portion 123 to abut against the limiting portion 135, at this time, the arm support 121 rotates to a preset angle, meanwhile, the buckle 136 is clamped into the groove 127, therefore, the arm support 121 is difficult to swing back, at this time, the arm support 121 is limited in two rotating directions, and the arm 120 is more stable after being unfolded.

Preferably, the catch 136 includes a bottom wall 137 and a catch 138. The shape of the pawl 138 is adapted to the shape of the recess 127. The bottom wall 137 is connected to the stopper 135. The bottom wall 137 is preferably connected to the top of the stopper portion 135. The bottom wall 137 may be a circular arc plate. The engaging portion 123 can move below the bottom wall 137. The pawl 138 extends from the bottom wall 137 toward the limit shaft 122. The latch 138 and the engagement portion 123 are in the same plane perpendicular to the stopper shaft 122. The latch 138 is engaged with the recess 127 of the engaging portion 123, and the latch 138 can be inserted into the recess 127. The distance from the side of the fitting portion 123 facing the stopper portion 135 to the recess 127 is equal to the distance from the claw 138 to the side of the stopper portion 135 facing the fitting portion 123. Thus, when the engaging portion 123 abuts against the limiting portion 135, the pawl 138 is just inserted into the groove 127.

Preferably, the side of the latch 138 is provided with a guide slope so that the engaging portion 123 can slide along the guide slope until the latch 138 is completely engaged with the groove 127. The click-on of the click-on fingers 138 into the grooves 127 is more labor-saving and smoother.

Preferably, an escape cavity 126 is provided within the mating portion 123. After the avoiding cavity 126 is arranged in the matching part 123, the matching part 123 is easy to elastically deform, the abrasion is small when the buckle 136 is clamped into or separated from the groove 127 of the matching part 123, and the service lives of the buckle 136 and the matching part 123 are longer.

In the present embodiment, the stopper shaft 122 is configured in a sleeve shape in which a hinge hole is provided. The central body 110 includes a hinge 125. The hinge 125 has one end connected to the horn 120 and the other end connected to the horn connecting portion 131 so that the horn 120 can rotate with respect to the central body 110.

Preferably, the hinge 125 is preferably a cam hinge. The cam structure is engaged with the shaft hole 132, so that the torsion received by the arm 120 is changed during the rotation from the first predetermined angle position to the second predetermined angle position. The cam hinge further limits the unfolded state and the folded state of the horn 120, so that the horn 120 is more stable.

The cam structure is provided with a maximum torsion part, so that the maximum torsion is applied when the horn 120 rotates to a third preset angle; the third preset angle is located between the first preset angle and the second preset angle.

When the horn 120 rotates from the first preset angle to the third preset angle, the torque applied to the horn gradually increases; when the arm 120 rotates from the third preset angle to the second preset angle, the torque applied thereto gradually decreases.

The advantage of this arrangement is that, after the cam structure is engaged with the shaft hole 132, during the rotation of the arm 120, the arm 120 is subjected to a torque force, so that the arm 120 tends to rotate towards the first predetermined angle at the third predetermined angle and the first predetermined angle, and tends to rotate towards the second predetermined angle at the third predetermined angle and the second predetermined angle, which is equivalent to the arm 120 tending to be folded or unfolded, and the cam structure is engaged with the shaft hole 132 to further limit the arm.

Preferably, the first preset angle is 0 degree, and the second preset angle is less than or equal to 180 degrees.

Preferably, hinge 125 includes a housing 124 and a spindle 133. The spindle 133 is disposed in the shaft hole 132 of the arm connecting portion 131, and is disposed coaxially with the shaft hole 132. The housing 124 is fitted over the mandrel 133. The housing 124 is hinged to the spindle 133. The housing 124 can rotate about the spindle 133. The spindle 133 is fixed to the arm connecting portion 131. The limiting shaft 122 is sleeved on the shell 124. The spacing shaft 122 and the housing 124 are relatively fixed. This allows the horn 120 to pivot about the hub 110.

Preferably, the cross-section of the housing 124 is configured to be non-circular, such as polygonal. The cross-section of the hinge bore of the limit shaft 122 is adapted to the cross-section of the housing 124 of the hinge 125. Thus, the stopper shaft 122 and the housing 124 are keyed so that torque is not transmitted between the stopper shaft 122 and the housing 124 without slipping.

Preferably, hinge 125 also includes a mount 134. The mount 134 is provided at one end of the arm connecting portion 131. The mounting seat 134 may be screwed to the arm connecting portion 131. The mount 134 is connected to the spindle 133. The mount 134 may be provided as a diamond plate covering one end of the arm connecting portion 131. The shaft 133 is perpendicular to the mounting seat 134, and one end of the shaft 133 is fixedly connected with the mounting seat 134. The arm support 121 is arranged at one end of the arm connecting part 131, which is far away from the mounting seat 134, and the shell 124 extends into the arm support 121 and is in screw connection with the arm support 121.

After the arrangement, the mounting seat 134 provided with the mandrel 133 is assembled with the housing 124, then the mounting seat 134 is mounted on the horn connecting portion 131, then the horn connecting portion 131 is mounted on the central body 110, and finally the limiting shaft 122 on the horn 120 is sleeved on the housing 124 and the housing 124 is in screw connection with the arm support 121. This allows the horn 120 to be mounted to the hub 110 with a simple assembly process.

Preferably, the horn connecting portion 131 is configured in a cylindrical shape. The arm connecting portion 131 is provided with a stopper groove 139 radially penetrating the arm connecting portion 131. The stopper groove 139 extends in the circumferential direction of the arm connecting portion 131. The engaging portion 123 is disposed in the limiting groove 139 and slides along the limiting groove 139. The stopper 135 is disposed at one end of the stopper groove 139. The fitting portion 123 is stopped by the inner wall of the other end of the stopper groove 139. The stopper portion 135 may be an end wall of the stopper groove 139.

The matching part 123 is constrained in the limiting groove 139 of the horn connecting part 131 and cannot move along the axial direction of the horn connecting part 131, and the matching part 123 is arranged on the limiting shaft 122, so that the limiting shaft 122 is constrained to be unable to move along the axial direction of the horn connecting part 131, the limiting shaft 122 is difficult to be separated from the horn connecting part 131, and meanwhile, the matching of the limiting shaft 122 and the horn connecting part 131 is tighter.

Preferably, as shown in fig. 6, the horn connecting portion 131 further includes a pillar 140. The two ends of the pillar 140 are respectively bridged at the two sides of the limiting groove 139. Both ends of the strut 140 are connected to the arm connecting portion 131.

The strut 140 can reinforce the structural strength of the horn connecting portion 131 at the position of the limiting groove 139, so that the overall structural strength of the horn connecting portion 131 is greatly improved.

In another exemplary embodiment, the limiting portion is a limiting protrusion, and the matching portion is a matching protrusion capable of abutting against the limiting protrusion, and when the matching protrusion passes over the limiting protrusion along with the rotation of the limiting shaft, the matching protrusion is blocked by the limiting protrusion. When the horn rotates to the first preset angle or the second preset angle, the limiting part is abutted against the matching part, the horn cannot rotate continuously, and the horn is limited.

In another exemplary embodiment, the limiting portion is a limiting protrusion, and the matching portion is a matching groove provided on the limiting shaft 122, and the limiting protrusion can be engaged with the matching groove. When the horn rotates to a first preset angle or a second preset angle, the limiting protrusion is clamped into the matching groove, the horn cannot rotate continuously, and the horn is limited.

In another exemplary embodiment, the horn 120 rotates relative to the hub 110 by engaging the outer peripheral wall of the retainer shaft 122 with the inner peripheral wall of the shaft hole 132. The stopper shaft 122 is inserted into the shaft hole 132, and the inner peripheral wall of the shaft hole 132 restricts the outer peripheral wall of the stopper shaft 122 so that the stopper shaft 122 can only rotate around the axis thereof. Thereby causing the horn 120 to rotate relative to the hub 110.

It is to be understood that the various examples described above may be utilized in various orientations (e.g., inclined, inverted, horizontal, vertical, etc.) and in various configurations without departing from the principles of the present invention. The embodiments illustrated in the drawings are shown and described merely as examples of useful applications of the principles of the invention, which is not limited to any specific details of these embodiments.

Of course, once the above description of representative embodiments is considered in great detail, those skilled in the art will readily appreciate that many modifications, additions, substitutions, deletions, and other changes may be made to these specific embodiments, and such changes are within the scope of the principles of the present embodiments. Therefore, the foregoing detailed description is to be clearly understood as being given by way of illustration and example only, the spirit and scope of the present invention being limited solely by the appended claims and their equivalents.