Limiting device and undercarriage

Abstract

The utility model provides a limiting device and an undercarriage. The limiting device comprises two limiting stoppers arranged in a spaced mode and a connecting rod connected between the two limiting stoppers, and a clamping cavity capable of being opened and closed is formed between the two limiting stoppers. The connecting rod comprises a push rod, connectors in threaded connection with the two ends of the push rod and nuts in threaded connection with the connectors and abutting against the ends of the push rod, and the ends, away from the push rod, of the connectors are connected with the limiting stoppers. According to the limiting device, the length of the connecting rod is adjustable, so that the interval between the two limiting stoppers is adjustable, the limiting device adapts to different exposure amounts of the piston rod, and the universality is good.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft landing gear, in particular to a limiting device and a landing gear. Background Art

[0002] Currently, weapons and equipment have requirements for rapid deployment, transportation and combat use. In order to ensure the safety of aircraft during air or sea transportation, it is necessary to limit the piston rod of the buffer of the aircraft landing gear in the parked state to prevent the piston rod from retracting too much and causing the aircraft to deflect left and right during transportation. The piston rod needs to be limited.

[0003] Because the weight, center of gravity, and parking load of each aircraft are different, the amount of exposure of the landing gear buffer piston rod when parked is also different. Therefore, the piston rod limiter must be infinitely adjustable in length and able to withstand various flight loads during air transportation and turbulence during sea transportation. It must also be simple to operate and meet the needs of quick installation and removal without the need for additional tools. Utility Model Content

[0004] The purpose of the utility model is to provide a limiting device and a landing gear, which are length-adjustable and can adapt to different exposed amounts of the piston rod and can well limit the exposed amount of the piston rod.

[0005] The technical solution of the utility model is: a limit device, including two limiters arranged at intervals and a connecting rod connected between the two limiters, and a clamping cavity that can be opened and closed is provided between the two limiters; the connecting rod includes a push rod, a joint threadedly connected to both ends of the push rod, and a nut threadedly connected to the joint and abutting the end of the push rod, and the end of the joint away from the push rod is connected to the limiter.

[0006] Preferably, the limiter includes a first support ring and a second support ring, the first support ring and the second support ring are buckled to form the clamping cavity, and one end of the connecting rod is hinged to the outside of the first support ring through a first pin.

[0007] Preferably, the axial surface of the first support ring is provided with a first buckle, the axial surface of the second support ring is provided with a second buckle, and the first buckle and the second buckle are buckled.

[0008] Preferably, the first buckle and the second buckle are L-shaped facing opposite directions.

[0009] Preferably, a second pin is inserted between the first support ring and the second support ring.

[0010] Preferably, the nut and the end of the push rod are abutted by a first stop washer and a second stop washer respectively, the first stop washer is connected to the push rod in an axially limited manner, and the second stop washer is connected to the joint in a radially limited manner.

[0011] Preferably, the axial surface of the first stop washer is provided with a first clamping block, the end of the push rod is provided with an axially recessed first clamping groove, and the first clamping block is adapted to the first clamping groove; the inner ring of the second stop washer is provided with a radially extending second clamping block, the joint is provided with a second clamping groove, and the second clamping block is adapted to the second clamping groove.

[0012] Preferably, among the two limiters, a second pin is inserted into the end of one of the limiters, the second pin extends in the radial direction of the limiter, and the second pin is arranged at the end away from the other limiter.

[0013] The utility model also provides a landing gear, comprising a buffer with a piston rod and the above-mentioned limiting device, wherein two limiters of the limiting device are sleeved on the piston rod, and the limiters are limited on the piston rod through a clamping cavity.

[0014] Compared with the related art, the beneficial effects of the present invention are:

[0015] First, the connecting rod in the limit device is designed to be adjustable in length, so that the interval between the two limiters can be adjusted, thereby adapting to different exposure amounts of the piston rod and having good versatility;

[0016] Second, the limiter of the limit device adopts an openable and closable clamping cavity to clamp the piston rod, and the two spaced limiters can effectively limit the exposed length of the piston rod, preventing the piston rod from retracting too much and causing the fan to deflect, thereby achieving effective limiting;

[0017] 3. The limiter of the limit device adopts two support rings interlocked with each other, which is simple to use, quick and easy to operate, and has a safe and reliable structure. The support ring is fixed and the connecting rod is connected by the insertion method of the first pin and the second pin, which can be quickly installed and disassembled without the help of additional tools.

[0018] Fourth, the connection method between the joint on the connecting rod and the push rod can realize the infinite adjustment of the connecting rod length, and through an axial stop washer and a radial stop washer to ensure the effective locking of the position of the push rod after adjustment to avoid loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of the limiting device provided by the utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure of the limiter;

[0021] Figure 3 Schematic diagram of the structure of the first support ring;

[0022] Figure 4 Schematic diagram of the structure of the second support ring;

[0023] Figure 5 for Figure 1 Schematic diagram of the connecting rod structure;

[0024] Figure 6 Schematic diagram of the structure of the push rod;

[0025] Figure 7 is a structural diagram of the joint;

[0026] Figure 8 is a schematic structural diagram of the first stop washer;

[0027] Figure 9 is a schematic structural diagram of the second stop washer;

[0028] Figure 10 This is a schematic diagram of the limit device provided by the utility model being installed on the buffer.

[0029] In the accompanying drawings: 1. Limiting device; 11. Limiter; 111. First support ring; 1111. First buckle; 112. Second support ring; 1121. Second buckle; 113. Clamping cavity; 114. Second pin; 12. Connecting rod; 121. Push rod; 1211. First slot; 122. Joint; 1221. Second slot; 123. Nut; 124. First stop washer; 1241. First block; 125. Second stop washer; 1251. Second block; 2. Buffer; 21. Piston rod. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments and features of the embodiments of the present invention may be combined unless they conflict. For ease of description, the words "upper," "lower," "left," and "right" appear below merely to indicate the directions of upper, lower, left, and right in the accompanying drawings and do not limit the structure.

[0031] like Figure 1 As shown, the present embodiment provides a limiter 1 comprising a limiter 11, a connecting rod 12, and a first pin 13. The limiters 11 are two in number and spaced apart. The two limiters 11 are connected by the connecting rod 12, and the connecting rod 12 is hinged to the limiter 11 by the first pin 13.

[0032] like Figure 2As shown, the stopper 11 includes a first support ring 111 and a second support ring 112. The first support ring 111 and the second support ring 112 are both semicircular, and when interlocked, they form a circular clamping cavity 113. The first pin 13 is inserted into the ear plate of the first support ring 111. The first pin 13 is a T-shaped structure, with one end of the first pin 13 being retained by the large end of the T-shape and one end of the ear plate on the first support ring 111. The other end of the first pin 13 is inserted into the second pin 114 and retained at the other end of the ear plate.

[0033] like Figure 3 、 Figure 4 As shown, the axial surface of the first support ring 111 is provided with a first buckle 1111, and the axial surface of the second support ring 112 is provided with a second buckle 1121. The first buckle 1111 and the second buckle 1121 are L-shaped facing opposite directions. Figure 2 As shown, the first buckle 1111 and the second buckle 1121 are staggered in the axial direction so that the first buckle 1111 and the second buckle 1121 are buckled. A second pin 114 is inserted between the first support ring 111 and the second support ring 112, and the second pin 114 is provided at both ends of the first support ring 111 and the second support ring 112 on the same circular surface.

[0034] like Figure 1 As shown, in the two stoppers 11, a second pin 114 is inserted at the end of one of the stoppers 11. The second pin 114 extends in the radial direction of the stopper 11, and the second pin 114 is arranged at the end away from the other stopper 11. The second pin 114 at this position can be extended to abut against the outer surface of the piston rod to limit the position (as shown in FIG. Figure 10 shown).

[0035] like Figure 5 As shown, the connecting rod 12 includes a push rod 121 , a joint 122 , a nut 123 , a first locking washer 124 and a second locking washer 125 .

[0036] like Figure 6 As shown, the push rod 121 is hollow inside, with both ends connected, an inner wall provided with an internal thread, and both ends are provided with an axially recessed first clamping groove 1211.

[0037] like Figure 7 As shown, one end of the joint 122 is provided with an external thread, and the other end is provided with an ear plate for hinged connection with the first pin 13. A second groove 1221 is provided on the outer surface of the joint 122 where the external thread is provided.

[0038] like Figure 8 As shown, the axial surface of the first retaining washer 124 is provided with a first clamping block 1241 , and two first clamping blocks 1241 are provided diagonally.

[0039] like Figure 9 As shown, a radially extending second clamping block 1251 is provided on the inner ring of the second stop washer 125 .

[0040] like Figure 5 As shown, the connector 122 has an externally threaded end on which a first stop washer 124, a second stop washer 125, and a nut 123 are mounted. The external threads of the connector 122 are connected to the internal threads of the push rod 121. The first clamping block 1241 is adapted to the first clamping groove 1211 to achieve axial positioning. The second clamping block 1251 is adapted to the second clamping groove 1221 to achieve radial positioning. Once the extension length of the connector 122 is determined, the nut 123 is screwed in to lock the connector 122 and define the positions of the first stop washer 124 and the second stop washer 125. The nuts 123 at both ends of the push rod 121 have opposite thread rotation directions.

[0041] like Figure 10 As shown, the present invention also provides a landing gear comprising a buffer 2 having a piston rod 21 and the aforementioned stopper 1. During use, the first support ring 111 and the second support ring 112 of the stopper 11 are docked onto the piston rod 21, close to the cylinder of the buffer 2. The first and second support rings 111, 112 of the stopper 11 are locked. Another stopper 11 is then installed according to the aforementioned steps. This stopper 11 is provided with a second radial pin 114 at its distal end.

[0042] Preliminarily adjust the distance between the two joints 122 based on the spacing between the two stoppers 11. Then, install the joint 122 at one end of the connecting rod 12 on one first support ring 111 using the first pin 13. Adjust the position of the other joint 122 at the other end of the connecting rod 12 to the appropriate position based on the position of the other first support ring 111, and then install it on the other first support ring 111 using the other first pin 13. After installation, install a safety wire between the first stop washer 124 and the nut 123 (both have small holes for installing the safety wire).

[0043] Then, the second pin 114 at the end of the limiter 11 is screwed in contact with the outer surface of the piston rod 21. This completes the safety of the limiter 1 and limits the extension length of the piston rod 21. To disassemble, simply pull out the second pin 114 and the first pin 13 without the need for tools.

[0044] When the aircraft is parked at different loads, after the limiter is installed on the piston rod 21 of the buffer, the piston rod 21 can be quickly limited by adjusting the length of the connecting rod 12 without having to deflate or inflate the buffer. Furthermore, the device itself uses a large number of quick-release pins for position control, allowing for rapid installation and removal in the confined space of the aircraft without the need for additional tools.

[0045] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A limiting device, characterized in that: It includes two spaced-apart limiters and a connecting rod connected between the two limiters, and a clamping cavity that can be opened and closed is provided between the two limiters; the connecting rod includes a push rod, a joint threadedly connected to both ends of the push rod, and a nut threadedly connected to the joint and abutting against the end of the push rod, and the end of the joint away from the push rod is connected to the limiter.

2. The limiting device according to claim 1, characterized in that: The limiter includes a first support ring and a second support ring, the first support ring and the second support ring are buckled to form the clamping cavity, and one end of the connecting rod is hinged to the outside of the first support ring through a first pin.

3. The limiting device according to claim 2, characterized in that: A first buckle is provided on the axial surface of the first support ring, and a second buckle is provided on the axial surface of the second support ring. The first buckle and the second buckle are buckled.

4. The limiting device according to claim 3, characterized in that: The first buckle and the second buckle are L-shaped and face oppositely.

5. The limiting device according to claim 2, characterized in that: A second pin is inserted between the first support ring and the second support ring.

6. The limiting device according to claim 1, characterized in that: The nut and the end of the push rod are respectively abutted by a first stop washer and a second stop washer. The first stop washer is connected to the push rod in an axially limited manner, and the second stop washer is connected to the joint in a radially limited manner.

7. The limiting device according to claim 6, characterized in that: The axial surface of the first stop washer is provided with a first clamping block, the end of the push rod is provided with an axially recessed first clamping groove, and the first clamping block is adapted to the first clamping groove; the inner ring of the second stop washer is provided with a radially extending second clamping block, the joint is provided with a second clamping groove, and the second clamping block is adapted to the second clamping groove.

8. The limiting device according to claim 1, characterized in that: Among the two limiters, a second pin is inserted into the end of one of the limiters. The second pin extends in the radial direction of the limiter, and the second pin is arranged at the end away from the other limiter.

9. A landing gear comprising a buffer having a piston rod, characterized in that: It also includes the limiting device according to any one of claims 1 to 8, wherein the two limiters of the limiting device are sleeved on the piston rod, and the limiters are limited on the piston rod through the clamping cavity.

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