Locking structure

Abstract

The utility model discloses a locking structure which comprises a gear box and a cylinder barrel, a convex ring is arranged on the end face of the gear box, the outer diameter of the convex ring is the same as the inner diameter of the cylinder barrel, the convex ring is internally sleeved at one end of the cylinder barrel, and a connecting block is sleeved outside the end of the cylinder barrel. The four corners of the connecting block are fixedly connected with the end face of the gearbox through first screws, stepped holes are formed in the four end faces, surrounding the cylinder barrel, of the connecting block, key grooves are formed in the positions, corresponding to the stepped holes, of the protruding ring, and the lower portions of the stretching force transmission keys are sequentially inserted into the stepped holes and the key grooves and are in interference fit with the key grooves and the stepped holes. The connecting structure has the advantages that the connecting strength of the connecting structure can be improved while the sizes of the screws and the connecting plates are not increased by stretching the force transmission keys, and the maximum stress is realized on the basis of the small size.

Description

Technical Field

[0001] The utility model relates to the technical field of electric barrel connection devices, in particular to a locking structure. Background Art

[0002] Electric actuators are widely used in the extension and retraction of UAV landing gear, such as Figure 7 As shown, the end is generally connected and locked with the gear box through a connecting block, and the connection form is generally a screw or bolt connection. However, in the application of the landing gear field of unmanned aerial vehicles, the end will be subjected to a large impact force, and the connection strength of the actuator is very high. In order to improve the tensile, compressive, and shear strength of the screws or bolts, the pitch of the thread can only be increased. Since the pitch of the thread is larger, the height of the teeth is also higher, and the strength is greater than that of the thread with a smaller pitch, but it will also increase the size of the bolt or screw. In order to adapt to large-sized bolts and screws, the size of the connecting block will increase accordingly, which will increase the overall weight of the electric actuator. For the field of unmanned aerial vehicles, the weight requirement is relatively high. The increase in the overall weight of the electric actuator will lead to weight deviation, thereby reducing the load capacity of the unmanned aerial vehicle. Therefore, a locking structure is needed that can ensure the connection strength without increasing the size of the connecting block and the overall weight of the electric actuator. Utility Model Content

[0003] The purpose of the utility model is to provide a locking structure, which has the advantage of increasing the connection strength by stretching the force transmission key without increasing the size of the screw and the connecting plate, thereby achieving the maximum force on the basis of a small size.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a locking structure, including a gear box and a cylinder, the end face of the gear box is provided with a convex ring, the outer diameter of the convex ring is the same as the inner diameter of the cylinder, and is internally sleeved on one end of the cylinder, and the end of the cylinder is externally provided with a connecting block, characterized in that: it also includes a stretching force transmission key, the connecting block is a rectangular block, and is fixedly connected to the end face of the gear box at the four corners by a first screw, the connecting block is provided with stepped holes around the four end faces of the cylinder, and the convex ring is provided with a keyway corresponding to the stepped hole, the lower part of the stretching force transmission key is inserted into the stepped hole and the keyway in turn and is interference fit with the keyway and the stepped hole.

[0005] Furthermore, the tensile force transmission key is fixedly connected to the connecting block by a second screw, and a limit block is provided at the upper end of the tensile force transmission key extending out of the connecting block, and the lower end surface of the limit block is fitted with the end surface of the connecting block.

[0006] Furthermore, threaded holes are provided at both ends of the limit block.

[0007] Furthermore, the size of the first screw is M4, and the size of the second screw is M2.5.

[0008] Furthermore, the first screw and the second screw are both sleeved with gaskets.

[0009] Furthermore, the size of the small hole of the stepped hole is the same as the size of the keyway, and the step of the stepped hole is provided with a threaded connection hole for connecting a second screw.

[0010] Compared with the prior art, the advantages of the utility model are:

[0011] Stepped holes and keyways are respectively provided on the connecting seat and the convex ring, and a stretching force transmission key is inserted therein with an interference fit. Under the premise of not increasing the size of the connecting seat, the stretching force transmission key increases the tensile strength, shear strength and torque resistance of the cylinder connection to the connecting block. At the same time, the stretching force transmission key with an interference fit ensures reliable torque transmission, prevents relative movement between the cylinder and the connecting block, improves the stability of the connection, and achieves the requirement of bearing the maximum tensile force. At the same time, the structural size of the electric actuator is effectively controlled, and the strength design requirement of bearing the maximum force is achieved on the basis of a small size. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is a front cross-sectional view of the utility model;

[0014] Figure 3 for Figure 2 AA section view;

[0015] Figure 4 is a schematic diagram of the structure of the gearbox;

[0016] Figure 5 It is a structural diagram of the connection block;

[0017] Figure 6 It is a structural schematic diagram of a tensile force transmission key;

[0018] Figure 7 A schematic diagram of the existing connection structure.

[0019] In the figure: 1. gear box; 2. cylinder; 3. convex ring; 4. connecting block; 5. first screw; 6. stepped hole; 7. keyway; 8. tension transmission key; 9. second screw; 10. limit block; 11. threaded hole; 12. gasket; 13. threaded connecting hole. DETAILED DESCRIPTION

[0020] The utility model will be further described below.

[0021] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0023] See also Figure 1-6

[0024] A locking structure includes a gear box 1 and a cylinder 2, wherein a convex ring 3 is provided on the end face of the gear box 1, wherein the outer diameter of the convex ring 3 is the same as the inner diameter of the cylinder 2, and the convex ring 3 is internally sleeved on one end of the cylinder 2, and a connecting block 4 is externally sleeved on the end of the cylinder 2, and further includes a tension force transmission key 8, wherein the connecting block 4 is a rectangular block, and is fixedly connected to the end face of the gear box 1 at four corners by first screws 5, and the connecting block 4 is provided with stepped holes 6 around the four end faces of the cylinder 2, and a keyway 7 is provided at the convex ring 3 corresponding to the stepped hole 6, and the lower part of the tension force transmission key 8 is inserted into the stepped hole 6 and the keyway 7 in sequence and has an interference fit with the keyway 7 and the stepped hole 6.

[0025] When in use, the driving motor is installed on the gear box 2 and provides the electric cylinder with telescopic power. The cylinder 2 of the electric cylinder is fixedly installed on the end face of the gear box 1 by four first screws 5 of size M4. When the electric cylinder is telescopic, the connection between the cylinder 2 and the connecting block 4 will be subjected to certain tensile force, shear force, etc. At this time, the cylinder 2 may not be able to provide sufficient strength to withstand a large load through the four M4 screws, especially in the case of aircraft landing gear applications that need to withstand high pressure. At the same time, its tensile, shear and torque resistance capabilities are also weak; therefore, the connecting seat 4 and The convex ring 3 is provided with a stepped hole 6 and a keyway 7, and a tension force transmission key 8 is inserted therein with interference fit. Without increasing the size of the connecting seat 4, the tension force transmission key 8 increases the tensile strength, shear strength and torque resistance of the cylinder 2 connected to the connecting block 4. At the same time, the tension force transmission key 8 with interference fit ensures reliable torque transmission, prevents relative movement between the cylinder 2 and the connecting block 1, improves the stability of the connection, and achieves the requirement of bearing a maximum tensile force of 3 tons. At the same time, the structural size of the electric actuator is effectively controlled, and the strength design requirement of maximum force is achieved on the basis of a small size.

[0026] Specifically, in the present embodiment, the stretching force transmission key 8 is fixedly connected to the connecting block 4 by a second screw 9. The size of the second screw 9 is M2.5, and two of them are provided, which are respectively installed on the left and right ends of the stretching force transmission key 8. The stretching force transmission key 8 is fixedly connected to the connecting block 4 by the second screw 9, which can further ensure the stability of the stretching force transmission key 8 and avoid the problem of loosening of the stretching force transmission key 8 due to being fixed only by interference fit under a high-pressure working environment.

[0027] The upper end of the stretching force transmission key 8 extending out of the connecting block 4 is provided with a limit block 10, and the lower end face of the limit block 10 is in contact with the end face of the connecting block 4. The limit block 10 can ensure the depth of the stretching force transmission key 8 inserted into the key slot 7, thereby preventing the stretching force transmission key 8 from being inserted too deeply into the key slot 7, which is not conducive to removing the stretching force transmission key 8 from the key slot 7.

[0028] Since the tension transmission key 8 is inserted into the stepped hole 6 and the keyway 7 by interference fit, it is difficult to directly pull the tension transmission key 8 out of the keyway 7 and the stepped hole 6 when the electric actuator needs to be disassembled and repaired. Threaded holes 11 are provided at both ends of the limit block 10. When the tension transmission key 8 needs to be pulled out from the keyway 7, a bolt is screwed into the threaded hole 11 at the same time. As the bolt moves in the threaded hole 11, the bottom surface of the bolt contacts and presses against the end surface of the connecting block 4, and the tension transmission key 8 is pushed upward by the bolt. Compared with the method of directly pulling the tension transmission key 8, the method of pushing by the bolt is convenient for the operator to operate, and the difficulty of removing the tension transmission key 8 is reduced by using tools adapted to the bolt, such as a wrench.

[0029] Specifically, in this embodiment, the first screw 5 and the second screw 9 are both sleeved with a gasket 12. The gasket 12 can ensure the stability and safety of the screw connection; specifically, the gasket 12 can be adjusted to protect the surface of the connection block 4 and the tensile force transmission key 8 to prevent the screw from scratching or indenting the surface, and the gasket 12 can increase the friction of the contact surface to prevent the screw from rotating or loosening during use.

[0030] Specifically, in this embodiment, the size of the small hole of the stepped hole 2 is the same as the size of the keyway 7 , and the step of the stepped hole 2 is provided with a threaded connection hole 13 for connecting the second screw 9 .

[0031] Specific examples are used in this article to illustrate the principles and implementation methods of the utility model. The description of the above embodiments is only used to help understand the method of the utility model and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation methods and application scope. Changes and improvements to the utility model will be possible without exceeding the concept and scope specified in the attached claims. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A locking structure, comprising a gear box (1) and a cylinder (2), wherein the end surface of the gear box (1) is provided with a convex ring (3), the outer diameter of the convex ring (3) is the same as the inner diameter of the cylinder (2), and the convex ring (3) is sleeved on one end of the cylinder (2), and the end of the cylinder (2) is covered with a connecting block (4), characterized in that: It also includes a tension force transmission key (8), the connecting block (4) is a rectangular block, and the four corners are fixedly connected to the end surface of the gear box (1) by first screws (5), the connecting block (4) is provided with stepped holes (6) on the four end surfaces surrounding the cylinder (2), and the convex ring (3) is provided with a keyway (7) at the position corresponding to the stepped hole (6), and the lower part of the tension force transmission key (8) is inserted into the stepped hole (6) and the keyway (7) in sequence and is interference fit with the keyway (7) and the stepped hole (6).

2. A locking structure according to claim 1, characterized in that: The stretching force transmission key (8) is fixedly connected to the connecting block (4) by a second screw (9); a limit block (10) is provided at the upper end of the stretching force transmission key (8) extending out of the connecting block (4); and the lower end surface of the limit block (10) is in contact with the end surface of the connecting block (4).

3. A locking structure according to claim 2, characterized in that: Threaded holes (11) are formed at both ends of the limit block (10).

4. A locking structure according to claim 1, characterized in that: The size of the first screw (5) is M4, and the size of the second screw (9) is M2.

5.

5. A locking structure according to claim 4, characterized in that: The first screw (5) and the second screw (9) are both sleeved with gaskets (12).

6. A locking structure according to claim 2, characterized in that: The size of the small hole of the stepped hole (6) is the same as the size of the keyway (7), and the step platform of the stepped hole (6) is provided with a threaded connection hole (13) for connecting the second screw (9).

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