CN113847372A

CN113847372A - Anti-loosening and anti-breaking undercarriage tension spring

Info

Publication number: CN113847372A
Application number: CN202111102679.1A
Authority: CN
Inventors: 张剑剑; 陈云; 任志勇; 张立军
Original assignee: AVIC First Aircraft Institute
Current assignee: Xian Aircraft Design and Research Institute of AVIC; AVIC First Aircraft Institute
Priority date: 2021-09-21
Filing date: 2021-09-21
Publication date: 2021-12-28

Abstract

The application belongs to aircraft spare part structure technique, in particular to locking prevent disconnected undercarriage extension spring. The spring seat has two ends which are respectively connected with the main spring through screws, the spring joint component has two ends, one end of the spring joint component is provided with the base, the spring seat is sleeved on the spring joint component and is limited by the base of the spring joint component, one end of the spring joint component faces the inside of the spring, the other end of the spring joint component, provided with the base, is connected with the protection spring, the spring is simple and convenient to mount, designed with a mounting mode of pretightening force, has a locking function, and the spring force value can be adjusted and has a breakage-proof protection device.

Description

Anti-loosening and anti-breaking undercarriage tension spring

Technical Field

The invention belongs to the technical field of airplane design, and particularly relates to a locking and breaking-preventing undercarriage tension spring.

Background

The invention belongs to the technology of airplane landing gear springs, and is suitable for the design of tension springs of lock mechanisms. The hook head of the common hook ring type tension spring is easy to break, and the operation of other mechanisms is influenced after the hook head breaks; when the spring is large, the installation is inconvenient; because the spring is an integral spring, the force value of the spring cannot be adjusted; the invention can better solve the problems.

Disclosure of Invention

In order to solve the above problems, the present invention provides a locking and breaking-preventing undercarriage tension spring, including: the spring seat is sleeved on the spring joint component and limited by the base of the spring joint component, one end of the spring joint component, which is provided with the base, faces the inside of the spring, and one end of the base of the two spring joint components, which is provided with the base, is connected with the protection spring.

Preferably, the outer wall surface of the spring seat is provided with a thread groove, the thread pitch of the thread groove is larger than that of the main spring, and when the spring seat is spirally connected with the main spring, the spring generates elastic deformation to provide pretightening force for the connection of the spring seat and the spring.

Preferably, both ends of the main spring are respectively provided with a small hole, one end of the spring seat close to the port of the main spring is provided with a plurality of small holes which are circumferentially arranged, and the small holes on the main spring and the small holes which are circumferentially arranged on the spring seat are tied through metal wires, so that the spring seat is prevented from rotating relative to the main spring.

Preferably, the spring joint assembly is far away from one end of the base is provided with a joint inner ring, one side, close to the end point, of the joint inner ring is provided with an oil filling nozzle, the other side of the joint inner ring is provided with a spring joint hole, oil can be filled into the joint inner ring through the oil filling nozzle for lubrication, and the joint inner ring can be connected with other tension springs through the spring joint hole.

Preferably, the number of turns of the thread groove of the outer wall of the spring seat is 3 or more.

Preferably, the spring joint assembly is provided with an annular weight-reducing groove at a middle section of a part sleeved with the spring seat.

Preferably, the circumferentially arranged adjacent apertures in the spring seat are slotted.

Preferably, the contact surface of the spring joint assembly and the spring seat is smooth, and the spring joint assembly can rotate relative to the spring seat.

Preferably, the protection spring is in an unstressed state in an original state of the main spring.

The advantages are that: firstly, the spring is simple and convenient to mount, is designed in a split mode, and is long in service life; secondly, a mounting mode of pretightening force is designed, and the anti-loosening function is achieved; thirdly, the spring force value can be adjusted; fourth, there is a break-proof protection device.

Drawings

FIG. 1 is a schematic view of the spring protection component of the present application.

Fig. 2 is a schematic view of a conventional tension spring.

FIG. 3 is the locking anti-breaking undercarriage extension spring assembly drawing of this application.

Fig. 4 is a diagram of a spring connector assembly component of the present application.

Fig. 5 is a schematic view of the spring seat of the present application.

The oil injection structure comprises a spring joint component 1, a spring seat 2, a main spring 3, a protection spring 4, a spring joint component 10, an oil injection nozzle 11, a joint inner ring 12 and a spring joint hole 13.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.

The anti-loosening and anti-breaking undercarriage tension spring mainly comprises a spring joint assembly 10, a spring seat 4, a main spring 3, a protection spring 5 and the like; the outer ring of the spring joint component 10 is connected with the spring seat 4; the tail end of the spring joint component 10 is connected with the protection spring 5; two ends of the main spring 7 are respectively connected with the two spring seats 4;

the spring joint assembly 10 consists of a grease nipple 11, a joint inner ring 12 and a spring joint 13, and is in the form of an articulated joint which can be wound around the joint inner ring 12 and is provided with the grease nipple 11, and the middle of the spring joint is also provided with a small hole for mounting a spring.

The spring sub assembly 10 can freely rotate around the spring seat 4; the two motions are independent of each other; the position of the spring joint assembly 10 is not affected when the spring seat 4 is screwed; circumferential rotation caused by extension and contraction of the main spring 3 is not transmitted to the spring joint;

the main body of the spring seat 4 is a spiral line groove which is used for installing the main spring 3, the pitch of the spiral line groove is larger than that of the main spring, and pretightening force can be generated after the spring is installed;

the spring force value is realized by screwing the main spring 3 into the screwing length of the spring seat 4, and the number of adjusting turns is more than 3; the tail end of the spring seat 4 is provided with 8 rectangular grooves, the precession force required by the installation of the main spring 3 needs to be taken as a force application point through the rectangular grooves, and the precession amount is used for controlling and adjusting the force value of the spring;

the maximum extension length of the protection spring 4 is far greater than the maximum extension length of the main spring 3; when the main spring 7 is accidentally broken, the protection spring 4 can prevent the main spring 3 from swinging randomly, and meanwhile, the protection spring can increase the tension of the spring.

The two ends of the main spring 3 are respectively provided with a small hole, and after the assembly of the spring and the adjustment of the force value are completed, the main spring 3 is connected with the spring seat 4 through a fuse 5, so that the effects of looseness prevention and warning are achieved. Because the tail end of the spring seat 4 is provided with eight small holes, the anti-loosening safety device can complete anti-loosening safety at multiple positions.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A locking breakage-proof undercarriage extension spring, comprising: main spring (3), spring coupling subassembly (1), spring holder (2) have two, respectively through the both ends of screwed connection in main spring (3), spring coupling subassembly (1) have two, and its one end is provided with the base, and spring holder (2) cover is gone up and by spring coupling subassembly (1) the base is spacing, inside spring coupling subassembly (1) had base one end towards the spring, its characterized in that: the ends of the two spring joint components (1) with the bases are connected through a protection spring (4).

2. The anti-loosening and anti-breaking landing gear tension spring as claimed in claim 1, wherein the outer wall surface of the spring seat (2) is provided with a thread groove, the thread groove has a thread pitch larger than that of the main spring (3), and when the spring seat (2) is spirally connected with the main spring (3), the spring (3) generates elastic deformation to provide pre-tightening force for the connection of the spring seat (2) and the spring.

3. The anti-loosening and anti-breaking undercarriage extension spring as claimed in claim 1, wherein the main spring (3) has a small hole at each end, the spring seat (2) has a plurality of circumferentially arranged small holes at one end near the port of the main spring (3), and the small holes on the main spring (3) and the circumferentially arranged small holes on the spring seat (2) are tied by a wire to prevent the spring seat (2) from rotating relative to the main spring (3).

4. The anti-loosening and anti-breaking undercarriage extension spring as claimed in claim 1, characterized in that one end of the spring joint assembly (10) far away from the base is provided with a joint inner ring (12), one side of the joint inner ring (12) close to the end point is provided with an oil nozzle (11), the other side of the joint inner ring (12) is provided with a spring joint hole (13), the joint inner ring (12) can be lubricated by oil through the oil nozzle (11), and the spring joint hole (13) can be connected with other extension springs.

5. The anti-loosening and anti-breaking landing gear tension spring as claimed in claim 1, wherein the number of turns of the thread groove of the outer wall of the spring seat (2) is 3 or more.

6. The anti-loosening and anti-breaking landing gear tension spring as claimed in claim 1, wherein an annular weight-reduction groove is provided in a middle section of a portion of the spring joint assembly (1) which is in fit with the spring seat (2).

7. The loss-resistant break-proof landing gear extension spring as claimed in claim 3, characterized in that the circumferentially arranged adjacent apertures in the spring seat (2) are slotted.

8. The anti-loosening and anti-breaking landing gear tension spring as claimed in claim 3, wherein the contact surface of the spring joint assembly (1) and the spring seat (2) is smooth, and the spring joint assembly (1) can rotate relative to the spring seat (2).

9. Anti-loose and anti-breaking landing gear extension spring according to claim 3, characterized in that the protection spring (4) is in an unstressed state in the original state of the main spring (3).