Rolling device for inner wall of landing gear shock strut outer cylinder

Abstract

The application discloses a landing gear shock strut outer cylinder inner wall rolling device, which comprises a supporting unit, a plurality of rolling units, a first driving unit, a second driving unit and a third driving unit, the supporting unit comprises a sleeve, each rolling unit is arranged in the lateral direction of the sleeve in the circumferential direction and is in sliding connection with the sleeve, and the rings formed by the rolling units are concentric with the sleeve, the first driving unit is connected with the sleeve and each rolling unit and is used for driving each rolling unit to be synchronously folded or unfolded so as to adjust the diameter of the ring formed by each rolling unit. The landing gear shock strut outer cylinder inner wall rolling device can control the consistency of the polishing depth and ensure the cylindricity of the repaired outer cylinder inner wall, thereby avoiding the formation of new local depressions and ensuring the service performance and reliability of the shock strut.

Description

Technical Field

[0001] This invention relates to the field of aircraft component maintenance technology, and in particular to a rolling device for the inner wall of the outer cylinder of a landing gear shock absorber strut. Background Technology

[0002] Aircraft landing gear shock absorber struts primarily employ a hydropneumatic structure, typically comprising an outer cylinder, inner cylinder, piston, piston rod, baffles, and sealing devices. Their shock absorption principle utilizes the synergistic effect of hydraulic fluid and compressed gas to absorb landing and taxiing impacts. The outer cylinder is the fixed part of the shock absorber strut, connected to the airframe structure, providing support for the inner cylinder and internal components. The inner cylinder can slide and extend within the outer cylinder, its lower end connected to the landing gear wheels to absorb ground impacts. The piston and piston rod divide the cylinder into an upper and lower chamber; the upper chamber is filled with compressed nitrogen (or air), and the lower chamber with hydraulic fluid. Baffles have flow-limiting orifices to control the fluid flow rate and adjust the shock absorption effect; sealing devices prevent fluid leakage and gas escape.

[0003] When the aircraft lands or taxis, the inner cylinder is compressed, causing the oil in the lower chamber to be squeezed into the upper chamber through the flow-limiting orifice. The nitrogen gas is compressed to achieve initial buffering, and at the same time, the oil dissipates the impact energy as it flows through the flow-limiting orifice. During the extension process, the nitrogen gas expands and pushes the oil back into the lower chamber, restoring the initial state.

[0004] During actual service, the inner wall of the shock absorber strut outer cylinder is prone to axial scratches, grooves, or micro-corrosion pits due to sand and dust particles intruding, fatigue peeling of the chrome plating layer, or poor lubrication. These surface defects can damage the oil film seal, leading to hydraulic oil leakage, and in severe cases, even causing the shock absorber strut to jam or fail.

[0005] During the repair of the outer cylinder of the shock absorber strut, the sealing end cap at the bottom of the outer cylinder must first be removed. Then, the inner cylinder and end cap are removed from the outer cylinder as a whole. Subsequently, workers use a polishing pen or roller to grind the interior through the bottom opening of the outer cylinder to eliminate defects on the inner wall. However, this manual operation method relies heavily on the worker's experience. It is not only difficult to control the consistency of the grinding depth, but also difficult to guarantee the cylindricity of the inner wall after repair. In fact, it is easy to create new local depressions, affecting the service performance and reliability of the shock absorber strut. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a rolling device for the inner wall of the outer cylinder of a landing gear shock absorber strut. This solves the technical problem that the existing method of manually polishing the inner wall of the outer cylinder with a hand-held polishing pen or rolling wheel is highly dependent on the worker's experience. Not only is it difficult to control the consistency of the polishing depth, but it is also difficult to ensure the cylindricity of the inner wall after repair. In fact, it is easy to form new local depressions, which affects the service performance and reliability of the shock absorber strut.

[0007] To achieve the above-mentioned technical objectives, the present invention provides a rolling device for the inner wall of the outer cylinder of a landing gear shock absorber strut, used to roll the inner wall of the outer cylinder, comprising: Support unit, including sleeve; Multiple rolling units are arranged circumferentially on the side of the sleeve and are slidably connected to the sleeve. The ring formed by the rolling units is concentric with the sleeve. The first driving unit is connected to the sleeve and each of the rolling units, and is used to drive each of the rolling units to synchronously close or open, so as to adjust the diameter of the ring formed by the rolling units. A second drive unit, connected to the sleeve, is used to drive the sleeve to rotate about its own central axis; and The third drive unit is connected to the second drive unit and is used to drive the second drive unit to move along the axial direction of the sleeve.

[0008] Furthermore, the outer wall of one end of the sleeve is provided with multiple through holes, and each of the rolling units is slidably inserted into each of the through holes.

[0009] Furthermore, the support unit also includes an abutment plate, which is sleeved on the outer side wall of the sleeve and used to abut against the opening at the bottom of the outer cylinder. The sleeve can rotate relative to the support plate about its own central axis or move along its own axial direction. The third drive unit connects the abutment plate and the second drive unit.

[0010] Furthermore, each of the rolling units is spirally distributed along the axial direction of the sleeve.

[0011] Furthermore, the rolling unit includes a sliding shaft, a seat, and a rolling wheel. The sliding shaft slides through the through hole, the seat is fixedly connected to the outer end of the sliding shaft, and the axle of the rolling wheel is rotatably connected to the seat. The first drive unit is connected to the sleeve and each of the sliding shafts.

[0012] Furthermore, the first drive unit includes a movable shaft, a first drive assembly, and multiple transmission assemblies. The movable shaft is coaxially arranged with the sleeve. The first drive assembly connects the sleeve and the movable shaft and is used to drive the movable shaft to move along its own axial direction. Each of the transmission assemblies is disposed inside the sleeve and is fixedly connected to the movable shaft. Each of the transmission assemblies is also connected to each of the rolling units in a corresponding manner to convert the movement of the movable shaft along its own axial direction into the synchronous closing or opening of each of the rolling units.

[0013] Furthermore, the sleeve includes a cylindrical body and a partition plate. A plurality of through holes are provided on the outer side wall of one end of the cylindrical body, and a threaded hole is coaxially provided on the end face of the other end of the cylindrical body. The partition plate is disposed inside the cylindrical body and close to the other end of the cylindrical body. A flower hole is coaxially provided on the partition plate. The end of the moving shaft close to the other end of the cylindrical body is a spline segment, and it slides through the flower hole via the spline segment. The first driving component is a screw. One end of the screw is rotatably connected to the other end of the moving shaft close to the cylindrical body, and the other end of the screw passes through the threaded hole and extends out of the cylindrical body. The screw is screwed to the threaded hole.

[0014] Furthermore, the transmission assembly includes a wedge block and elastic elements. The wedge block is fixedly connected to the moving shaft. The wedge block has an inclined surface, the slope of which varies along the axial direction of the moving shaft. Each inclined surface abuts against each of the rolling units in a corresponding manner, so as to convert the movement of the moving shaft along its own axial direction into the synchronous opening of each of the rolling units. One end of each elastic element is connected to the cylinder body, and the other end of each elastic element is connected to each of the rolling units in a corresponding manner, so as to convert the movement of the moving shaft along its own axial direction into the synchronous closing of each of the rolling units.

[0015] Furthermore, the second drive unit includes a connecting frame and a rotation drive component. The connecting frame is fixedly connected to the other end of the sleeve, and the output end of the rotation drive component is fixedly connected to the connecting frame for driving the connecting frame to rotate around the central axis of the sleeve.

[0016] Furthermore, the third driving unit includes a connecting plate and a telescopic driving component. One end of the connecting plate is fixedly connected to the fixed end of the rotating driving component, the fixed end of the telescopic driving component is fixedly connected to the abutment plate, and the output end of the rotating driving component is fixedly connected to the other end of the connecting plate, for driving the connecting plate to move axially along the sleeve.

[0017] Compared with the prior art, the beneficial effects of the present invention include: In use, the sealing end cap at the bottom of the outer cylinder is removed, and then the inner cylinder and end cap are removed from the outer cylinder as a whole. Then, the worker holds the rolling device and inserts one end of the sleeve into the outer cylinder. Next, the first drive unit is operated, which drives each rolling unit to open synchronously, so that the diameter of the ring formed by the rolling units increases until each rolling unit abuts against the inner wall of the outer cylinder. At this time, the sleeve and the outer cylinder are coaxial, that is, each rolling unit and the outer cylinder are coaxial. Then, the second drive unit is operated, which drives the sleeve to rotate around its own central axis. The rotation of the rollers drives the rolling units to rotate, rolling the inner wall of the outer cylinder. Simultaneously, the third drive unit is controlled, which drives the second drive unit to move along the axial direction of the sleeve, thereby moving the sleeve along its own axial direction. This, in turn, moves the rolling units along the axial direction of the outer cylinder, achieving rolling at various points on the inner wall of the outer cylinder. Using this landing gear shock absorber strut outer cylinder inner wall rolling device to roll the inner wall of the outer cylinder not only controls the consistency of the grinding depth but also ensures the cylindricity of the inner wall of the outer cylinder after repair, thus avoiding the formation of new local depressions and ensuring the service performance and reliability of the shock absorber strut. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of a rolling device for the inner wall of the outer cylinder of a landing gear shock absorber strut provided by the present invention; Figure 2 This is a three-dimensional structural diagram of the rolling device for the inner wall of the outer cylinder of the landing gear shock absorber strut provided by the present invention during use; Figure 3 This is a cross-sectional view of a rolling device for the inner wall of the outer cylinder of a landing gear shock absorber strut provided by the present invention; Figure 4 yes Figure 3 Enlarged view of point A in the image; Figure 5 yes Figure 3 Enlarged view of point B in the image; In the diagram: 1 - outer cylinder, 100 - support unit, 110 - sleeve, 111 - through hole, 112 - cylinder body, 113 - partition plate, 120 - abutment plate, 200 - rolling unit, 210 - sliding shaft, 220 - seat, 230 - rolling wheel, 300 - first drive unit, 310 - moving shaft, 320 - first drive assembly, 321 - screw, 330 - transmission assembly, 331 - inclined block, 3311 - inclined surface, 332 - elastic element, 400 - second drive unit, 410 - connecting frame, 420 - rotation drive element, 500 - third drive unit, 510 - connecting plate, 520 - telescopic drive element. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] This invention provides a rolling device for the inner wall of the outer cylinder of a landing gear shock absorber strut, used to roll the inner wall of the outer cylinder 1, and its structure is as follows. Figure 1 - Figure 3 As shown, the device includes a support unit 100, multiple rolling units 200, a first drive unit 300, a second drive unit 400, and a third drive unit 500. The support unit 100 includes a sleeve 110. Each rolling unit 200 is circumferentially disposed on the side of the sleeve 110 and slidably connected to the sleeve 110. The ring formed by the rolling units 200 is concentric with the sleeve 110. The first drive unit 300 connects the sleeve 110 and each rolling unit 200 and drives each rolling unit 200 to synchronously close or open, thereby adjusting the diameter of the ring formed by the rolling units 200. The second drive unit 400 is connected to the sleeve 110 and drives the sleeve 110 to rotate around its own central axis. The third drive unit 500 is connected to the second drive unit 400 and drives the second drive unit 400 to move axially along the sleeve 110.

[0021] In use, remove the sealing end cap at the bottom of the outer cylinder 1, then remove the inner cylinder and end cap as a whole from the outer cylinder 1. The worker then holds the rolling device and inserts one end of the sleeve 110 into the outer cylinder 1. Next, the first drive unit 300 is operated, which drives each rolling unit 200 to open synchronously, increasing the diameter of the ring formed by the rolling units 200 until all rolling units 200 are in contact with the inner wall of the outer cylinder 1. At this point, the sleeve 110 and the outer cylinder 1 are coaxial, meaning each rolling unit 200 is coaxial with the outer cylinder 1. Then, the second drive unit 400 is operated, driving the sleeve 110 to rotate around its own central axis. This allows each rolling unit 200 to rotate and roll the inner wall of the outer cylinder 1. Simultaneously, the third drive unit 500 is controlled, which drives the second drive unit 400 to move along the axial direction of the sleeve 110, thereby moving the sleeve 110 along its own axial direction. This, in turn, moves each rolling unit 200 along the axial direction of the outer cylinder 1, achieving rolling at various points on the inner wall of the outer cylinder 1. Using this landing gear shock absorber strut outer cylinder inner wall rolling device to roll the inner wall of the outer cylinder 1 not only controls the consistency of the grinding depth but also ensures the cylindricity of the inner wall of the outer cylinder 1 after repair, thus avoiding the formation of new local depressions and ensuring the service performance and reliability of the shock absorber strut.

[0022] As a preferred embodiment, please refer to Figure 3 and Figure 4The outer wall of one end of the sleeve 110 is provided with multiple through holes 111. Each rolling unit 200 is slidably inserted through each through hole 111. The through holes 111 can guide the rolling unit 200 to ensure that each rolling unit 200 can be closed or opened synchronously.

[0023] As a preferred embodiment, please refer to Figure 1 and Figure 2 The support unit 100 also includes an abutment plate 120, which is sleeved on the outer wall of the sleeve 110 and abuts against the opening at the bottom of the outer cylinder 1. The sleeve 110 can rotate about its own central axis or move along its own axial direction relative to the support plate. The third drive unit 500 connects the abutment plate 120 and the second drive unit 400. In use, the sealing end cap at the bottom of the outer cylinder 1 is removed, and then the inner cylinder and end cap are removed from the outer cylinder 1 as a whole. Then, the worker holds the rolling device and inserts one end of the sleeve 110 into the outer cylinder 1 until the abutment plate 120 abuts against the opening at the bottom of the outer cylinder 1, indicating that the rolling device is installed in place. While holding the rolling device, the worker applies a force to the rolling device to make the abutment plate 120 press against the opening at the bottom of the outer cylinder 1.

[0024] As a preferred embodiment, please refer to Figure 1 and Figure 3 Each rolling unit 200 is spirally distributed along the axial direction of the sleeve 110, which can improve the rolling effect and achieve full coverage.

[0025] As a preferred embodiment, please refer to Figure 3 and Figure 4 The rolling unit 200 includes a sliding shaft 210, a seat 220, and a rolling wheel 230. The sliding shaft 210 is slidably inserted through the through hole 111. The seat 220 is fixedly connected to the outer end of the sliding shaft 210. The axle of the rolling wheel 230 is rotatably connected to the seat 220. The first drive unit 300 connects the sleeve 110 and each sliding shaft 210. Through the cooperation between the sliding shaft 210 and the through hole 111, the movement of the rolling unit 200 can be guided and restricted. The surface of the rolling wheel 230 has a hard alloy ring with a specific curvature, which polishes the inner wall of the outer cylinder 1 during the rolling process.

[0026] As a preferred embodiment, please refer to Figure 4 and Figure 5The first drive unit 300 includes a movable shaft 310, a first drive assembly 320, and multiple transmission assemblies 330. The movable shaft 310 is coaxially arranged with the sleeve 110. The first drive assembly 320 connects the sleeve 110 and the movable shaft 310 and drives the movable shaft 310 to move along its own axial direction. Each transmission assembly 330 is disposed inside the sleeve 110 and fixedly connected to the movable shaft 310. Each transmission assembly 330 is also connected to each rolling unit 200 in a corresponding manner to convert the movement of the movable shaft 310 along its own axial direction into the synchronous closing or opening of each rolling unit 200. This is achieved by controlling the first drive assembly. 320, the first drive assembly 320 drives the moving shaft 310 to move along its own axial direction, that is, the moving shaft 310 moves along the axial direction of the sleeve 110. Since each transmission assembly 330 can convert the movement of the moving shaft 310 along its own axial direction into the synchronous contraction or opening of each rolling unit 200, the diameter of the ring formed by the rolling units 200 can be adjusted, so that the rolling wheels 230 of each rolling unit 200 abut against the inner wall of the outer cylinder 1. This not only ensures that the ring formed by the rolling units 200 is coaxial with the sleeve 110, but also ensures that each rolling unit 200 rolls the inner wall of the outer cylinder 1.

[0027] As a preferred embodiment, please refer to Figure 4 and Figure 5 The sleeve 110 includes a cylindrical body 112 and a partition 113. Multiple through holes 111 are formed on the outer wall of one end of the cylindrical body 112. A threaded hole is coaxially formed on the end face of the other end of the cylindrical body 112. The partition 113 is disposed inside the cylindrical body 112 and near the other end of the cylindrical body 112. A perforated hole is coaxially formed on the partition 113. The end of the moving shaft 310 near the other end of the cylindrical body 112 is a splined section, which slides through the perforated hole. The first drive assembly 320 is a screw 321. One end of the screw 321 is rotatably connected to the other end of the moving shaft 310 near the cylindrical body 112, and the other end of the screw 321 passes through the threaded hole and extends out of the cylindrical body 112. The screw 321 is threaded into the threaded hole. Next, because the movable shaft 310 is restricted by the perforated hole of the partition plate 113, the movable shaft 310 can only move along its own axis. Rotating the other end of the screw 321 in the forward or reverse direction can drive the movable shaft 310 to move along its own axis. When the screw 321 is rotated by hand, since one end of the screw 321 is rotatably connected to the other end of the movable shaft 310 near the cylinder 112, and because the movable shaft 310 is restricted by the perforated hole, it can only move along its own axis and cannot rotate around its own central axis. Therefore, when the screw 321 rotates in the forward or reverse direction, it can drive the movable shaft 310 to move along its own axis, that is, along the axis of the sleeve 110.

[0028] A cavity is provided at the other end of the movable shaft 310 near the cylinder 112. The end of the screw 321 has a columnar end cap, which is rotatably disposed in the cavity, thereby enabling one end of the screw 321 to be rotatably connected to the other end of the movable shaft 310 near the cylinder 112.

[0029] As a preferred embodiment, please refer to Figure 5 The partition 113 is detachable from the cylinder 112, which facilitates the installation of components located inside the cylinder 112.

[0030] In another embodiment, the first drive component 320 is a cylinder (not shown in the figure), the fixed end of the cylinder is fixedly connected to the sleeve 110, and the output end of the cylinder is fixedly connected to the moving shaft 310.

[0031] As a preferred embodiment, please refer to Figure 4 and Figure 5 The transmission assembly 330 includes a wedge block 331 and elastic elements 332. The wedge block 331 is fixedly connected to the moving shaft 310. The wedge block 331 has an inclined surface 3311, the slope of which varies along the axial direction of the moving shaft 310. Each inclined surface 3311 abuts against each rolling unit 200 in a corresponding manner to convert the movement of the moving shaft 310 along its own axial direction into the synchronous opening of each rolling unit 200. One end of each elastic element 332 is connected to the cylinder body 112, and the other end of each elastic element 332 is connected to each rolling unit 200 in a corresponding manner to convert the movement of the moving shaft 310 along its own axial direction into the synchronous closing of each rolling unit 200. When the moving shaft 310 moves along its own axial direction toward one end of the sleeve 110, each... The inclined plane 3311 can convert the movement of the moving shaft 310 along its own axial direction into the synchronous opening of each rolling unit 200, thereby increasing the diameter of the ring formed by the rolling units 200 until each rolling unit 200 abuts against the inner wall of the outer cylinder 1. During this process, each elastic element 332 undergoes elastic deformation and accumulates elastic deformation potential energy. When the moving shaft 310 moves along its own axial direction toward the other end of the sleeve 110, each elastic element 332 releases elastic deformation potential energy, which can convert the movement of the moving shaft 310 along its own axial direction toward the other end of the sleeve 110 into the synchronous closing of each rolling unit 200, thereby reducing the diameter of the ring formed by the rolling units 200. This not only ensures reliable transmission but also facilitates installation.

[0032] As a preferred embodiment, please refer to Figure 4 The inclined surface 3311 abuts against the inner end of the sliding shaft 210, thereby pushing the rolling unit 200 toward a direction away from the moving shaft 310.

[0033] As a preferred embodiment, please refer to Figure 4The elastic element 332 is disposed outside the cylinder body 112 and sleeved on the outer side wall of the sliding shaft 210. The two ends of the elastic element 332 abut against the cylinder body 112 and the seat 220 respectively. The sliding shaft 210 can guide and limit the elastic element 332 to prevent the elastic element 332 from bending axially.

[0034] As a preferred embodiment, please refer to Figure 4 The elastic element 332 is a spring.

[0035] In another embodiment, the elastic element 332 is an airbag.

[0036] In another embodiment, the transmission assembly 330 includes a transmission block (not shown in the figure) and a transmission shaft (not shown in the figure). The transmission block is fixedly connected to the movable shaft 310. The transmission block has a transmission groove that extends axially along the movable shaft 310, and the distance between the transmission groove and the movable shaft 310 varies axially along the movable shaft 310. One end of the transmission shaft is slidably connected to the transmission groove, and the other end of the transmission shaft is connected to the rolling unit 200. When the movable shaft 310 moves axially toward one end of the sleeve 110, the various transmission grooves and the transmission shaft cooperate to move the sleeve 110. The movement of shaft 310 along its own axial direction is converted into the synchronous opening of each rolling unit 200, thereby increasing the diameter of the ring formed by the rolling units 200 until each rolling unit 200 abuts against the inner wall of the outer cylinder 1. When the moving shaft 310 moves along its own axial direction toward the other end of the sleeve 110, the transmission groove and the transmission shaft cooperate to convert the movement of the moving shaft 310 along its own axial direction toward the other end of the sleeve 110 into the synchronous closing of each rolling unit 200, thereby decreasing the diameter of the ring formed by the rolling units 200.

[0037] In another embodiment, the first drive unit 300 may also adopt a multi-cylinder structure, through which multiple cylinders drive each rolling unit 200 to move radially along the sleeve 110, thereby realizing the synchronous closing or opening of each rolling unit 200.

[0038] As a preferred embodiment, please refer to Figure 1 and Figure 5 The second drive unit 400 includes a connecting frame 410 and a rotation drive 420. The connecting frame 410 is fixedly connected to the other end of the sleeve 110. The output end of the rotation drive 420 is fixedly connected to the connecting frame 410 and is used to drive the connecting frame 410 to rotate around the central axis of the sleeve 110. When the rotation drive 420 is started, the output end of the rotation drive 420 rotates, driving the connecting frame 410 to rotate around the central axis of the sleeve 110, thereby driving the sleeve 110 to rotate around its own central axis.

[0039] In another embodiment, the second drive unit 400 may be used in conjunction with a motor, employing a gear, chain, or pulley.

[0040] As a preferred embodiment, please refer to Figure 1 The third drive unit 500 includes a connecting plate 510 and a telescopic drive member 520. One end of the connecting plate 510 is fixedly connected to the fixed end of the rotating drive member 420, and the fixed end of the telescopic drive member 520 is fixedly connected to the abutment plate 120. The output end of the rotating drive member 420 is fixedly connected to the other end of the connecting plate 510, which is used to drive the connecting plate 510 to move along the axial direction of the sleeve 110. When the telescopic drive member 520 is activated, the output end of the telescopic drive member 520 extends or retracts, driving the connecting plate 510 to move along the axial direction of the sleeve 110. That is, the sleeve 110 is driven to move along its own axial direction via the rotating drive member 420 and the connecting frame 410.

[0041] In another embodiment, the third drive unit 500 may adopt a lead screw and nut structure.

[0042] As a preferred embodiment, the landing gear shock absorber strut outer cylinder inner wall rolling device further includes a lubrication and cooling unit (not shown in the figure). The lubrication and cooling unit is used to provide lubricant to each rolling unit 200, thereby ensuring the lubrication of the rolling area, reducing rolling friction heat, and promoting plastic flow of surface micro-protrusions.

[0043] In a preferred embodiment, the lubrication and cooling unit includes a storage tank, pipelines, and a pump body. One end of the pipeline is connected to the sleeve 110, the inlet end of the pump body is connected to the storage tank, and the outlet end of the pump body is connected to the other end of the pipeline. The pipeline is used to pump the lubricant in the storage tank into the pipeline. The lubricant pumped into the pipeline enters the sleeve 110 and reaches the sliding shaft 210 of each rolling unit 200. Then, it overflows from the through hole 111 along the sliding shaft 210 and reaches the rolling roller 230.

[0044] As a preferred embodiment, the landing gear shock absorber strut outer cylinder inner wall rolling device further includes a monitoring unit (not shown in the figure). The monitoring unit is used to measure the contour roundness and roughness of the inner wall of the outer cylinder 1, and also to measure the temperature of the rolling zone to prevent the temperature rise of the rolling zone from exceeding the tempering temperature of the outer cylinder 1 material.

[0045] In a preferred embodiment, the monitoring unit includes multiple laser triangulation sensors, multiple temperature sensors, and a controller. Each laser triangulation sensor is connected to each rolling unit 200 in a one-to-one correspondence to measure the contour roundness and roughness of the inner wall of the outer cylinder 1. Each temperature sensor is connected to each rolling unit 200 in a one-to-one correspondence to measure the temperature of the rolling zone. The input terminal of the controller is electrically connected to each laser triangulation sensor and each temperature sensor to acquire the data monitored by each laser triangulation sensor and each temperature sensor. The output terminal of the controller is electrically connected to the pump body to control the output power of the pump body.

[0046] To better understand this invention, the following is combined with... Figure 1 - Figure 5 The working principle of the technical solution of the present invention will be described in detail below: In use, remove the sealing end cap at the bottom of the outer cylinder 1, then remove the inner cylinder and end cap as a whole from the outer cylinder 1. The worker then holds the rolling device and inserts one end of the sleeve 110 into the outer cylinder 1 until the abutment plate 120 abuts against the opening at the bottom of the outer cylinder 1, indicating that the rolling device is properly installed. While holding the rolling device, the worker applies a force to make the abutment plate 120 press firmly against the opening at the bottom of the outer cylinder 1. Next, the worker rotates the screw 321 clockwise. Since one end of the screw 321 is rotatably connected to the other end of the moving shaft 310 near the cylinder body 112, and... Because the movable shaft 310 is restricted by the perforation, it can only move along its own axial direction and cannot rotate around its own central axis. Therefore, when the screw 321 is in the positive direction, it can drive the movable shaft 310 to move along its own axial direction toward one end of the sleeve 110. Each inclined surface 3311 can convert the movement of the movable shaft 310 along its own axial direction into the synchronous opening of each rolling unit 200, thereby increasing the diameter of the ring formed by the rolling units 200 until each rolling unit 200 abuts against the inner wall of the outer cylinder 1. During this process... Each elastic element 332 undergoes elastic deformation and accumulates elastic deformation potential energy. At this time, the sleeve 110 and the outer cylinder 1 remain coaxial, that is, each rolling unit 200 remains coaxial with the outer cylinder 1. Then, the rotation drive 420 is activated, and the output end of the rotation drive 420 rotates, driving the connecting frame 410 to rotate around the central axis of the sleeve 110. This, in turn, drives the sleeve 110 to rotate around its own central axis, thereby driving each rolling unit 200 to rotate and roll the inner wall of the outer cylinder 1. At the same time, the telescopic drive 520 is activated, and the output end of the telescopic drive 520 extends... The length or shortening of the sleeve 110 is driven by the connecting plate 510 moving axially along the sleeve 110. In other words, the sleeve 110 is driven to move axially along its own axis via the rotating drive 420 and the connecting frame 410. This also drives each rolling unit 200 to move axially along the outer cylinder 1, thereby achieving rolling at various points on the inner wall of the outer cylinder 1. By using this landing gear shock absorber strut outer cylinder inner wall rolling device to roll the inner wall of the outer cylinder 1, not only can the consistency of the grinding depth be controlled, but the cylindricity of the inner wall of the outer cylinder 1 after repair can also be guaranteed, thereby avoiding the formation of new local depressions and ensuring the service performance and reliability of the shock absorber strut.

[0047] The landing gear shock absorber strut outer cylinder inner wall rolling device provided by the present invention has the following beneficial effects: (1) When the screw 321 is rotated by hand, one end of the screw 321 is rotatably connected to the other end of the movable shaft 310 near the cylinder 112. The movable shaft 310 is restricted by the flower hole, so that the movable shaft 310 can only move along its own axis and cannot rotate around its own central axis. Therefore, when the screw 321 rotates in the forward or reverse direction, it can drive the movable shaft 310 to move along its own axis, that is, to move along the axis of the sleeve 110. (2) When the moving shaft 310 moves along its own axis toward one end of the sleeve 110, each inclined surface 3311 can convert the movement of the moving shaft 310 along its own axis into the synchronous opening of each rolling unit 200, thereby increasing the diameter of the ring formed by the rolling units 200 until each rolling unit 200 abuts against the inner wall of the outer cylinder 1. During this process, each elastic element 332 undergoes elastic deformation and accumulates elastic deformation potential energy. When the moving shaft 310 moves along its own axis toward the other end of the sleeve 110, each elastic element 332 releases elastic deformation potential energy, which can convert the movement of the moving shaft 310 along its own axis toward the other end of the sleeve 110 into the synchronous closing of each rolling unit 200, thereby reducing the diameter of the ring formed by the rolling units 200. This not only ensures reliable transmission but also facilitates installation. (3) The rolling device for the inner wall of the outer cylinder of the landing gear shock absorber strut is used to roll the inner wall of the outer cylinder 1. This not only controls the consistency of the grinding depth, but also ensures the cylindricity of the inner wall of the outer cylinder 1 after repair, thereby avoiding the formation of new local depressions and ensuring the service performance and reliability of the shock absorber strut.

[0048] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A rolling device for the inner wall of the outer cylinder of a landing gear shock absorber strut, used for rolling the inner wall of the outer cylinder, characterized in that, include: Support unit, including sleeve; Multiple rolling units are arranged circumferentially on the side of the sleeve and are slidably connected to the sleeve. The ring formed by the rolling units is concentric with the sleeve. The first driving unit is connected to the sleeve and each of the rolling units, and is used to drive each of the rolling units to synchronously close or open, so as to adjust the diameter of the ring formed by the rolling units. The second drive unit is connected to the sleeve and is used to drive the sleeve to rotate around its own central axis. and The third drive unit is connected to the second drive unit and is used to drive the second drive unit to move along the axial direction of the sleeve.

2. The landing gear shock absorber strut outer cylinder inner wall rolling device according to claim 1, characterized in that, The outer wall of one end of the sleeve has multiple through holes, and each of the rolling units is slidably inserted into each of the through holes.

3. The landing gear shock absorber strut outer cylinder inner wall rolling device according to claim 1, characterized in that, The support unit further includes an abutment plate, which is sleeved on the outer wall of the sleeve and abuts against the opening at the bottom of the outer cylinder. The sleeve can rotate about its own central axis or move along its own axial direction relative to the support plate. The third drive unit connects the abutment plate and the second drive unit.

4. The landing gear shock absorber strut outer cylinder inner wall rolling device according to claim 1, characterized in that, Each of the rolling units is spirally distributed along the axial direction of the sleeve.

5. The landing gear shock absorber strut outer cylinder inner wall rolling device according to claim 2, characterized in that, The rolling unit includes a sliding shaft, a seat, and a rolling wheel. The sliding shaft slides through the through hole. The seat is fixedly connected to the outer end of the sliding shaft. The axle of the rolling wheel is rotatably connected to the seat. The first drive unit is connected to the sleeve and each of the sliding shafts.

6. The landing gear shock absorber strut outer cylinder inner wall rolling device according to claim 5, characterized in that, The first driving unit includes a movable shaft, a first driving assembly, and multiple transmission assemblies. The movable shaft is coaxially arranged with the sleeve. The first driving assembly connects the sleeve and the movable shaft and drives the movable shaft to move along its own axial direction. Each of the transmission assemblies is disposed inside the sleeve and is fixedly connected to the movable shaft. Each of the transmission assemblies is also connected to each of the rolling units in a corresponding manner to convert the movement of the movable shaft along its own axial direction into the synchronous closing or opening of each of the rolling units.

7. The landing gear shock absorber strut outer cylinder inner wall rolling device according to claim 6, characterized in that, The sleeve includes a cylindrical body and a partition plate. A plurality of through holes are provided on the outer side wall of one end of the cylindrical body. A threaded hole is coaxially provided on the end face of the other end of the cylindrical body. The partition plate is disposed inside the cylindrical body and close to the other end of the cylindrical body. A flower hole is coaxially provided on the partition plate. The end of the moving shaft close to the other end of the cylindrical body is a spline segment, which slides through the flower hole via the spline segment. The first driving component is a screw. One end of the screw is rotatably connected to the other end of the moving shaft close to the cylindrical body. The other end of the screw passes through the threaded hole and extends out of the cylindrical body. The screw is screwed to the threaded hole.

8. The landing gear shock absorber strut outer cylinder inner wall rolling device according to claim 7, characterized in that, The transmission assembly includes a wedge and elastic elements. The wedge is fixedly connected to the moving shaft. The wedge has an inclined surface, the slope of which varies along the axial direction of the moving shaft. Each inclined surface abuts against each of the rolling units in a corresponding manner, so as to convert the movement of the moving shaft along its own axial direction into the synchronous opening of each of the rolling units. One end of each elastic element is connected to the cylinder body, and the other end of each elastic element is connected to each of the rolling units in a corresponding manner, so as to convert the movement of the moving shaft along its own axial direction into the synchronous closing of each of the rolling units.

9. The landing gear shock absorber strut outer cylinder inner wall rolling device according to claim 3, characterized in that, The second drive unit includes a connecting frame and a rotation drive component. The connecting frame is fixedly connected to the other end of the sleeve, and the output end of the rotation drive component is fixedly connected to the connecting frame for driving the connecting frame to rotate around the central axis of the sleeve.

10. The landing gear shock absorber strut outer cylinder inner wall rolling device according to claim 9, characterized in that, The third drive unit includes a connecting plate and a telescopic drive component. One end of the connecting plate is fixedly connected to the fixed end of the rotating drive component, the fixed end of the telescopic drive component is fixedly connected to the abutment plate, and the output end of the rotating drive component is fixedly connected to the other end of the connecting plate, for driving the connecting plate to move axially along the sleeve.

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