Landing gear retraction and locking mechanism, aircraft landing gear

Abstract

The invention provides an aircraft landing gear and a retracting and locking mechanism of the landing gear, the mechanism comprises a column, a frame, a lower support rod, an upper support rod, an upper lock assembly, a lower lock assembly, an actuator assembly, an upper linkage member and a lower linkage member, the two ends of the column are respectively provided with a first frame hinged portion; the first end of the lower support rod is hinged to the middle of the column; the first end of the upper support rod is hinged to the second end of the lower support rod, and the second end of the upper support rod is provided with a second frame hinged portion; the upper lock assembly comprises an upper locking member and an upper locking accessory that cooperate with each other, the upper locking member is arranged on the column, and the upper locking accessory is provided with a frame fixing portion; the lower lock assembly comprises a lower locking member and a lower locking accessory that cooperate with each other, the lower locking member is arranged on the upper support rod, and the lower locking accessory is arranged near the connection position between the upper support rod and the lower support rod. The invention has a small volume, low cost and simple structure.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft structure design, and relates to an aircraft landing gear and a retracting, extending and locking mechanism of the landing gear. Background Art

[0002] The purpose of retracting and extending the aircraft landing gear is to reduce air resistance. The aircraft landing gear retraction and extension system generally uses hydraulic pressure as the normal retraction and extension power source. The retractable landing gear is locked in the retracted and lowered position by a locking mechanism to prevent the landing gear from automatically lowering during flight or automatically retracting when hit. The space for storing retractable landing gear is very limited, so the simplest and most reasonable mechanism is needed to achieve the retraction and extension of the landing gear. The landing gear of most aircraft is generally retracted and extended by a retracting actuator, and the unlocking of the upper lock and the lower lock is achieved by different actuators. This structure is relatively complex, large in size, heavy in weight and high in cost.

[0003] For example, the Chinese utility model patent with the announcement number CN216232939U discloses a front landing gear of an aircraft. When the aircraft lowers the landing gear during landing, hydraulic pressure is transmitted to the spring hydraulic cylinder of the upper lock. After the upper lock is opened, hydraulic pressure is transmitted to the retracting cylinder, and the landing gear is slowly lowered by the movement of the piston of the retracting cylinder. When in the vertical position, the lower lock assembly is locked by the elastic force of the disc spring group in the unlocking cylinder. However, the landing gear of this scheme is large in size and cannot meet the requirements of miniaturization of aircraft. In addition, multiple cylinders are used, the pipelines are complicated, and the cost is high. Summary of the invention

[0004] The first purpose of the present invention is to provide a retractable and locking mechanism for a landing gear that is small in size, can meet the requirements of aircraft miniaturization, has low cost, and has a simple structure, and can complete the retraction, extension, and locking of the landing gear with one actuator.

[0005] A second object of the present invention is to provide an aircraft landing gear having the above-mentioned landing gear retracting, extending and locking mechanism.

[0006] In order to achieve the above-mentioned first purpose, the retracting and locking mechanism of the landing gear provided by the present invention includes a column, a frame, a lower support rod, an upper support rod, an upper lock assembly, a lower lock assembly, an actuator cylinder assembly, an upper linkage member and a lower linkage member, and the two ends of the column are respectively provided with a first frame hinge part; the first end of the lower support rod is hinged to the middle of the column; the first end of the upper support rod is hinged to the second end of the lower support rod, and the second end of the upper support rod is provided with a second frame hinge part; the upper lock assembly includes an upper locking member and an upper locking accessory that cooperate with each other, the upper locking member is arranged on the column, and the upper locking accessory is provided with a frame fixing part; the lower lock assembly includes a lower locking member and a lower locking accessory that cooperate with each other, the lower locking member is arranged on the upper support rod, and the lower locking accessory is arranged near the connection position of the upper support rod and the lower support rod; the first end of the actuator cylinder assembly It is hinged on the upper support rod and close to the second frame hinge part, and the second end of the actuator cylinder assembly is hinged on the first end of the column; the actuator cylinder assembly is connected to the upper locking part through the upper linkage part; the upper support rod is connected to the lower locking part through the lower linkage assembly; when the actuator cylinder assembly contracts, the actuator cylinder assembly drives the upper linkage part and the upper support rod to move, the upper linkage part drives the upper locking part to separate from the upper locking accessory, and the column can be rotated to the lower position, and the lower linkage assembly drives the lower locking part to engage with the lower locking accessory, and the upper support rod is relatively fixed; when the actuator cylinder assembly is extended, the lower linkage assembly drives the lower locking part to separate from the lower locking accessory, the actuator cylinder assembly drives the upper support rod to move, the upper support rod and the lower support rod rotate relatively, the upper linkage part drives the upper locking part to engage with the upper locking accessory, and the column is fixed in the retracted position.

[0007] As can be seen from the above, the landing gear can be retracted and lowered by setting an actuator assembly, and at the same time, the upper linkage and the lower linkage assembly can respectively drive the lower lock assembly and the upper lock assembly to achieve locking and unlocking when the landing gear is retracted, and locking and unlocking when the landing gear is lowered, thereby reducing redundant parts and simplifying piping, reducing volume and reducing costs.

[0008] A further solution is that the lower locking part is hinged to the upper support rod; the upper locking part is hinged to the column; the actuator assembly includes an actuator, a first hinge shaft and a linkage push block; the linkage push block is fixed on the driving shaft of the actuator, the first hinge shaft is arranged on the upper support rod, and the linkage push block is hinged to the upper support rod through the first hinge shaft; an unlocking inclined surface is arranged on the linkage push block; when the actuator is extended, the unlocking inclined surface drives the lower linkage assembly to move, and the lower linkage assembly drives the lower locking part to disengage from the lower locking accessory.

[0009] As can be seen from the above, by setting the unlocking trigger body on the linkage push block, the unlocking trigger body can synchronously trigger the lower lock to unlock during the extension of the actuator assembly, so that one actuator assembly can complete the locking and unlocking actions during the retraction and extension of the landing gear.

[0010] A further solution is that a first adjusting groove is also provided on the linkage push block, the extension direction of the first adjusting groove is parallel to the extension and retraction direction of the actuator cylinder, the first end of the first adjusting groove is close to the actuator cylinder relative to the second end, and the first hinge shaft slides in cooperation with the first adjusting groove; the actuator cylinder assembly also includes a limit plate and a movable connecting member; the limit plate is fixed to the first end of the column, and a limit groove is provided on the limit plate; the movable connecting member includes a limit protrusion and two intersecting connecting arms, the limit protrusion is located at the connection of the two connecting arms and protrudes outward from the side walls of the connecting arms, and the ends of the two connecting arms away from the limit protrusion are respectively hinged to the second end of the actuator cylinder and the limit plate, and the limit protrusion is movably arranged in the limit groove.

[0011] It can be seen from the above that, through the cooperation of the first adjustment groove, the movable connecting piece and the limit groove, the direction of movement of the movable connecting piece in the limit groove is parallel to the movement direction of the upper locking piece and the upper locking accessory, thereby realizing the locking and unlocking process. The first adjustment groove can optimize the overall structure, improve the stability of the overall structural movement, reduce the tolerance requirements, and reduce the design difficulty. The movable connecting piece is a triangular connecting arm. The triangular connecting arm can ensure the structural strength while reducing the volume of parts, can improve the freedom of movement of the actuator, can save space, and prevent interference between the actuator and the limit plate.

[0012] A further solution is that the upper lock assembly also includes an upper spring; the two ends of the upper spring are respectively connected to the upper locking member and the column; the two ends of the upper linkage member are respectively hinged to the upper locking member and the actuator.

[0013] As can be seen from the above, the upper spring and the upper adjustment rod maintain the elastic movement state of the upper locking member, which is convenient for locking with the upper locking matching member, and can offset the resonance occurring during the operation of the aircraft, preventing the upper locking member from loosening due to vibration.

[0014] A further solution is that the upper linkage component includes a coaxial upper adjusting screw, a first upper rod body and a second upper rod body; the first upper rod body is hinged to the upper locking component, and the second upper rod body is hinged to the actuator; the upper adjusting screw is connected between the first upper rod body and the second upper rod body; at least one of the first upper rod body and the second upper rod body is threadedly connected to the upper adjusting screw, and by rotating the upper adjusting screw, the first upper rod body and the second upper rod body move closer or farther away.

[0015] As can be seen from the above, the upper adjustment rod includes an upper adjustment screw, a first upper rod body and a second upper rod body, and has a simple structure. By rotating the upper adjustment screw, the tightness of the upper locking member can be easily adjusted, which facilitates the replacement of parts to compensate for tolerances and facilitates operation.

[0016] A further solution is that the lower linkage assembly includes a lower spring, a lower adjustment rod and a second hinge shaft; a connecting plate is provided at the second end of the upper support rod, a second adjustment groove is provided on the connecting plate, two ends of the lower adjustment rod are respectively hinged to the lower locking member and the connecting plate, the lower adjustment rod and the connecting plate are hinged through the second hinge shaft, and the second hinge shaft slides in cooperation with the second adjustment groove; the two ends of the lower spring are respectively connected to the lower adjustment rod and the upper support rod, and the elastic restoring force of the lower spring forces the second hinge shaft to move toward one side of the lower locking member; when the actuator is extended, the unlocking inclined surface drives the second hinge shaft to move in the second adjusting groove in a direction away from the lower locking member, and the lower adjustment rod drives the lower locking member to disengage from the lower locking accessory.

[0017] As can be seen from the above, the lower spring, the lower adjustment rod, the connecting plate and the second hinge shaft are provided, and the second hinge shaft is movably provided in the second adjustment groove in the connecting plate. The lower spring keeps the second hinge shaft close to the lower spring, and the unlocking trigger body drives the second hinge shaft to move away. The tightness of the locking of the lower locking member is adjusted by the lower adjustment rod. The lower spring ensures that the second hinge shaft is close to the lower spring to ensure the locked state. The operation is simple and can prevent the lower locking member from being unable to be unlocked due to being too tight, or the locked state from being unstable due to being too loose. It is also convenient for fine-tuning to compensate for the tolerance problem caused by replacing new parts. It has good versatility and can offset the resonance occurring during the operation of the aircraft to prevent the upper locking member from loosening due to vibration.

[0018] A further solution is that the lower adjustment rod includes a coaxial lower adjustment screw, a first lower rod body and a second lower rod body; the first lower rod body is hinged to the lower locking piece, and the second lower rod body is hinged to the connecting piece; the lower adjustment screw is connected between the first lower rod body and the second lower rod body, and the first lower rod body and the second lower rod body are moved closer or farther away by rotating the lower adjustment screw; the lower spring is connected to the second lower rod body.

[0019] As can be seen from the above, the lower adjustment rod includes a lower adjustment screw, a first lower rod body and a second lower rod body, and has a simple structure. By rotating the upper adjustment screw, the tightness of the upper locking member can be easily adjusted, which facilitates the replacement of parts to compensate for tolerances and facilitates operation.

[0020] A further solution is that the lower locking accessory consists of a first buckle body and a second buckle body, the first buckle body is located at the first end of the upper support rod, and the second buckle body is located at the second end of the lower support rod; the hinged positions of the upper support rod and the lower support rod are arranged on both sides of the upper support rod relative to the lower lock assembly; when the lower locking component is buckled with the lower locking accessory, the first buckle body and the second buckle body are both inserted into the lower locking component.

[0021] As can be seen from the above, the lower locking accessory is composed of the first buckle body and the second buckle body, and the locking state is stable.

[0022] A further solution is that a lower sensing part is provided on the lower locking member, a lower locking sensor is provided on the lower support rod, and the lower locking sensor detects the position of the lower sensing part; and / or, an upper sensing part is provided on the upper locking member, an upper locking sensor is provided on the frame, and the upper locking sensor detects the position of the upper sensing part.

[0023] As can be seen from the above, by setting up the upper locking sensor and the lower locking sensor, it is possible to facilitate the assistance in determining whether the door is locked in place, thereby further improving its safety.

[0024] In order to achieve the above-mentioned second purpose, the present invention provides an aircraft landing gear, which includes a frame and a retractable and locking mechanism for the landing gear of any one of the above-mentioned items; the column is hinged to the frame through a first frame hinge part, the upper support rod is hinged to the frame through a second frame hinge part, and the upper locking accessory is fixed to the frame through a frame fixing part.

[0025] In summary, the retractable, extending and locking mechanism of the landing gear provided by the present invention has a small size, a simple structure, good versatility and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of an upper locking member of an embodiment of the retractable and locking mechanism of a landing gear of the present invention in a locked state.

[0027] Figure 2 The invention is a structural diagram of a landing gear in a retracted position according to an embodiment of the landing gear retracting and locking mechanism.

[0028] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0029] Figure 4 It is a diagram of the first unlocked state of the upper locking member of the embodiment of the retractable and locking mechanism of the landing gear of the present invention.

[0030] Figure 5 It is a diagram of the second unlocked state of the upper locking member of the embodiment of the landing gear retracting and locking mechanism of the present invention.

[0031] Figure 6 The present invention is a diagram showing the unlocked state of the lower locking member of the landing gear retracting and locking mechanism embodiment of the present invention.

[0032] Figure 7 It is a structural diagram of the movable connecting member of the landing gear retracting, extending and locking mechanism embodiment of the present invention. DETAILED DESCRIPTION

[0033] See also Figures 1 to 3The aircraft landing gear includes a frame, a tire (not shown) and a retractable and locking mechanism of the landing gear. The upper locking mechanism of the landing gear includes a column 2, a lower support rod 3, an upper support rod 4, an upper locking assembly 5, a lower locking assembly 6, an actuator assembly 7, an upper linkage member 8, a lower linkage assembly 9 and a frame (not shown). The first end of the column 2 is provided with a first frame hinge portion, the second end of the column 2 is provided with a tire mounting portion, and the column 2 is hinged to the frame through the first frame hinge portion. The first end of the lower support rod 3 is hinged to the middle of the column 2, and preferably, the hinge position is close to the midpoint of the column 2. The first end of the upper support rod 4 is hinged to the second end of the lower support rod 3, the second end of the upper support rod 4 is provided with a second frame hinge portion, and the upper support rod 4 is hinged to the frame through the second frame hinge portion. The tire is arranged on the tire mounting portion of the column 2.

[0034] The upper lock assembly 5 includes an upper spring 84 and an upper lock 50 and an upper lock accessory 51 that can be interlocked. The upper lock 50 is hinged at the middle of the column 2 and close to the first end of the lower support rod 3. The upper lock accessory 51 is provided with a frame fixing part and is installed on the frame through the frame fixing part. The two ends of the upper spring 84 are respectively connected to the upper lock 50 and the column 2. The lower lock assembly 6 includes a lower lock 60 and a lower lock accessory 61 that cooperate with each other. The lower lock 60 is hinged between the first end and the second end of the upper support rod 4. The upper lock 50 is a lock hook, and the upper lock accessory 51 is a lock ring. The lower lock accessory 61 is arranged near the connection position between the upper support rod 4 and the lower support rod 3. In this embodiment, the lower locking accessory 61 is composed of a first buckle body 62 and a second buckle body 63. The lower locking component 50 has a locking groove for engaging the first buckle body 62 and the second buckle body 63. The first buckle body 62 is located at the first end of the upper support rod 4, and the second buckle body 63 is located at the second end of the lower support rod 3. The hinged position of the upper support rod 4 and the lower support rod 3 is arranged on both sides of the upper support rod 4 opposite to the lower lock assembly 6.

[0035] Combination Figure 7 The first end of the actuator assembly 7 is hinged on the upper support rod 4 and close to the second frame hinge part, and the second end of the actuator assembly 7 is hinged on the first end of the column 2. The actuator assembly 7 includes an actuator 70, a stopper 71, a movable connecting member 72, a first hinge shaft 73 and a linkage push block 74.

[0036] The linkage push block 74 is fixed on the driving shaft of the actuator 70, and the first hinge shaft 73 is arranged on the upper support rod 4. The linkage push block 74 is hinged to the upper support rod 4 through the first hinge shaft 73. The linkage push block 74 is provided with an unlocking inclined surface 740 and a first adjusting groove 741, and the extension direction of the first adjusting groove 741 is parallel to the extension direction of the actuator 70. When the actuator 70 is extended, the unlocking inclined surface 740 drives the lower linkage assembly 9 to move, and the lower linkage assembly 9 drives the lower locking member 60 to disengage from the lower locking accessory 61.

[0037] The first end of the first adjustment slot 741 is close to the actuator 70 relative to the second end. The limiting plate 71 is fixed to the first end of the column 2, and a limiting slot 710 is provided on the limiting plate 71. The movable connecting member 72 includes a limiting portion 720 and two connecting arms 721, the two connecting arms 721 intersect, the limiting portion 720 is located at the connection of the two connecting arms 721 and protrudes outward from the side walls of the connecting arms 721 to form a limiting protrusion, and the ends of the two connecting arms 721 away from the limiting protrusion are respectively hinged to the second end of the actuator 70 and the limiting plate 71, and the limiting portion 720 is movably arranged in the limiting slot 710, and the limiting slot 710 has a first blocking wall and a second blocking wall, the second blocking wall and the first blocking wall are opposite to each other in the movement direction of the limiting portion 720, and the second blocking wall is close to the actuator 70 relative to the first blocking wall in the movement direction of the limiting portion 720. When the upper locking member 50 is in the locked state, the first hinge shaft 73 is located at the first end of the first adjusting groove 741, and the limiting portion 720 abuts against the first retaining wall of the limiting groove 710; when the lower locking member 60 is in the locked state, the first hinge shaft 73 is located at the second end of the first adjusting groove 741, and the limiting portion 720 abuts against the second retaining wall of the limiting groove 710. During the unlocking process of the upper locking member 50, when the limiting portion 720 moves to abut against the second retaining wall, the upper locking member and the upper locking accessory are separated.

[0038] The upper linkage 8 is an upper adjustment rod 80, which includes a first upper rod body 81, a second upper rod body 82 and an upper adjustment screw 83 on a coaxial line. The first upper rod body 81 is hinged to the upper locking member 50, and the second upper rod body 82 is hinged to the second end of the actuator 70. The upper adjustment screw 83 is connected between the first upper rod body 81 and the second upper rod body 82. One of the first upper rod body 81 and the second upper rod body 82 is threadedly connected to the upper adjustment screw 83. When the upper adjustment screw 83 is rotated, the upper adjustment screw 83 adjusts the distance between the first upper rod body 81 and the second upper rod body 82, so that the first upper rod body 81 and the second upper rod body 82 are close to or away from each other, thereby adjusting the tightness of the locking of the upper locking member 50.

[0039] The lower linkage assembly 9 includes a lower spring 90, a lower adjustment rod 91 and a second hinge shaft 92. The lower adjustment rod 91 includes a coaxial lower adjustment screw 910, a first lower rod body 911 and a second lower rod body 912. The lower adjustment screw 910 is connected between the first lower rod body 911 and the second lower rod body 912, and one of the first lower rod body 911 and the second lower rod body 912 is threadedly connected to the lower adjustment screw 910. The upper support rod 4 is provided with a connecting piece 40, which is arranged near the second end of the upper support rod 4, and the connecting piece 40 is provided with a second adjustment groove 41, the extension direction of the second adjustment groove 41 is parallel to the upper support rod 4, and the second hinge shaft 92 is slidably matched with the second adjustment groove 41. The two ends of the lower spring 90 are respectively connected to the lower adjustment rod 91 and the upper support rod 4. Optionally, at least one of the first lower rod body 911 and the second lower rod body 912 is threadedly connected to the lower adjustment screw 910.

[0040] The first lower rod 911 is hinged to the lower locking member 60, and the second lower rod 912 is hinged to the connecting piece 40 through the second hinge shaft 92. The lower adjusting screw 910 is rotated to adjust the distance between the first lower rod 911 and the second lower rod 912, so that the first lower rod 911 and the second lower rod 912 are closer to or farther from each other, thereby adjusting the tightness of the locking of the lower locking member 60. The elastic restoring force of the lower spring 90 forces the second hinge shaft 92 to move toward one side of the lower locking member 60. When the actuator 70 begins to extend, the unlocking inclined surface 740 drives the second hinge shaft 92 to move in the second adjusting groove 41 in the direction away from the lower locking member 60, and the lower adjusting rod 91 drives the lower locking member 60 to disengage from the lower locking accessory 61.

[0041] The lower locking member 60 is provided with a lower sensing part, and the lower support rod 3 is provided with a lower locking sensor 1 for detecting whether the lower locking member 60 and the lower locking accessory 61 are locked in place, and the lower locking sensor 1 detects the position of the lower sensing part. The upper locking member 50 is provided with a position sensing part, and the frame is also provided with an upper locking sensor 11, and the upper locking sensor 11 detects the position of the position sensing part. The upper locking sensor 11 and the lower locking sensor 1 can be displacement sensors or micro switches.

[0042] See also Figure 4 and Figure 5When the cam 720 is in the closed position, the first locking cam 720 is in the closed position, and the first and second locking cams 720 are in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam 720 is in the closed position, and the cam

[0043] See also Figure 6 , the actuator 70 is extended, the unlocking inclined surface 740 of the linkage push block 74 drives the second hinge shaft 92 to move in the second adjusting groove 41 in the direction away from the lower spring 90, the lower locking member 60 rotates, the lower locking member 60 and the lower locking accessory 61 are separated, the column 2 and the upper support rod 4 rotate at the same time, the landing gear begins to retract, the first hinge shaft 73 moves from the second end close to the first adjusting groove 741 to the first end close to the first adjusting groove 741, the limiting portion 720 of the movable connection member 72 is separated from the second retaining wall of the limiting groove 710, and moves to abut against the first retaining wall, the limiting portion 720 continues to drive the column 2 to rotate until the upper locking sensor 11 detects that the upper locking member 50 and the upper locking accessory 51 are in place, the column 2 rotates to the retracted position, and the landing gear is fully retracted.

[0044] In summary, the upper locking mechanism of the landing gear provided by the present invention has a small size, a simple structure, good versatility and low cost.

[0045] The above-described embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features and principles described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. The retracting and locking mechanism of the landing gear includes: A column, one end of which is provided with a first frame hinge portion; A lower support rod, wherein a first end of the lower support rod is hinged to a middle portion of the column; An upper support rod, wherein a first end of the upper support rod is hinged to a second end of the lower support rod, and a second frame hinge portion is disposed on the second end of the upper support rod; Characterized in that the retractable and locking mechanism also includes: An upper lock assembly, the upper lock assembly comprising an upper lock member and an upper lock accessory that cooperate with each other, the upper lock member is arranged on the column, and the upper lock accessory is provided with a frame fixing portion; A lower lock assembly, the lower lock assembly comprising a lower lock member and a lower lock accessory that cooperate with each other, the lower lock member is arranged on the upper support rod, and the lower lock accessory is arranged near the connection position between the upper support rod and the lower support rod; An actuator assembly, wherein a first end of the actuator assembly is hinged on the upper support rod and close to the second frame hinge portion, and a second end of the actuator assembly is hinged on the first end of the column; The lower locking member is hinged to the upper support rod; The lower locking accessory is composed of a first buckle body and a second buckle body, the first buckle body is located at the first end of the upper support rod, the second buckle body is located at the second end of the lower support rod, and the lower locking component has a locking groove for engaging the first buckle body and the second buckle body; The hinged position of the upper support rod and the lower support rod and the lower lock assembly are arranged on both sides of the upper support rod opposite to each other; When the lower locking member is buckled with the lower locking accessory, the first buckle body and the second buckle body are both snapped into the lower locking member; The actuating cylinder assembly comprises an actuating cylinder, a first hinge shaft and a linkage push block; The linkage push block is fixed on the driving shaft of the actuator, the first hinge shaft is arranged on the upper support rod, and the linkage push block is hinged to the upper support rod through the first hinge shaft; The linkage push block is provided with an unlocking inclined surface; The linkage push block is also provided with a first adjustment slot, the extension direction of the first adjustment slot is parallel to the extension direction of the actuating cylinder, the first end of the first adjustment slot is closer to the actuating cylinder than the second end, and the first hinge shaft is slidably matched with the first adjustment slot; An upper linkage member, through which the actuator assembly and the upper locking member are connected; A lower linkage assembly, through which the upper support rod and the lower locking member are connected; When the actuating cylinder assembly contracts, the actuating cylinder assembly drives the upper linkage member and the upper support rod to move, the upper linkage member drives the upper locking member to separate from the upper locking accessory, the column can be rotated to a lowered position, the lower linkage assembly drives the lower locking member to engage with the lower locking accessory, and the upper support rod is relatively fixed to the lower support rod; When the actuating cylinder assembly is extended, the unlocking inclined surface drives the lower linkage assembly to move, and the lower linkage assembly drives the lower locking component to separate from the lower locking accessory, and the first hinge shaft moves from the second end close to the first adjusting groove to the first end close to the first adjusting groove, and the actuating cylinder assembly drives the upper support rod to move, and the upper support rod and the lower support rod rotate relative to each other, and the upper linkage component drives the upper locking component to engage with the upper locking accessory, and the column is fixed in the retracted position.

2. The landing gear retracting and locking mechanism according to claim 1, characterized in that: The upper locking piece is hinged to the column.

3. The landing gear retracting and locking mechanism according to claim 2, characterized in that: The actuator assembly also includes a limit plate and a movable connecting piece; The limiting piece is fixed to the first end of the column, and a limiting groove is provided on the limiting piece; The movable connecting part includes a limiting protrusion and two intersecting connecting arms. The limiting protrusion is located at the connection of the two connecting arms and protrudes outward from the side walls of the connecting arms. The ends of the two connecting arms away from the limiting protrusion are respectively hinged to the second end of the actuator cylinder and the limiting plate. The limiting protrusion can be movably arranged in the limiting groove.

4. The landing gear retracting and locking mechanism according to claim 3, characterized in that: The upper lock assembly also includes an upper spring; The two ends of the upper spring are respectively connected to the upper locking member and the column; The two ends of the upper linkage member are respectively hinged to the upper locking member and the actuating cylinder.

5. The landing gear retracting and locking mechanism according to claim 4, characterized in that: The upper linkage member comprises a coaxial upper adjustment screw, a first upper rod body and a second upper rod body; The first upper rod body is hinged to the upper locking member, and the second upper rod body is hinged to the actuator cylinder; The upper adjusting screw is connected between the first upper rod body and the second upper rod body; At least one of the first upper rod body and the second upper rod body is threadedly connected to the upper adjusting screw rod, and the first upper rod body and the second upper rod body are moved closer or farther away by rotating the upper adjusting screw rod.

6. The landing gear retracting and locking mechanism according to claim 2, characterized in that: The lower linkage assembly includes a lower spring, a lower adjustment rod and a second hinge shaft; The second end of the upper support rod is provided with a connecting piece, and the connecting piece is provided with a second adjustment slot. The two ends of the lower adjustment rod are respectively hinged to the lower locking member and the connecting piece. The lower adjustment rod is hinged to the connecting piece through a second hinge shaft, and the second hinge shaft is slidably matched with the second adjustment slot. The two ends of the lower spring are respectively connected to the lower adjustment rod and the upper support rod, and the elastic restoring force of the lower spring forces the second hinge shaft to move toward one side of the lower locking member; When the actuating cylinder is extended, the unlocking inclined surface drives the second hinge shaft to move in the second adjusting groove in a direction away from the lower locking member, and the lower adjusting rod drives the lower locking member to separate from the lower locking accessory.

7. The landing gear retracting and locking mechanism according to claim 6, characterized in that: The lower adjustment rod comprises a coaxial lower adjustment screw, a first lower rod body and a second lower rod body; The first lower rod body is hinged to the lower locking member, and the second lower rod body is hinged to the connecting piece; The lower adjusting screw is connected between the first lower rod body and the second lower rod body, and the first lower rod body and the second lower rod body are moved closer or farther away by rotating the lower adjusting screw; The lower spring is connected to the second lower rod body.

8. The landing gear retracting and locking mechanism according to any one of claims 1 to 6, characterized in that: The lower locking member is provided with a lower sensing portion, and the lower support rod is provided with a lower locking sensor, and the lower locking sensor detects the position of the lower sensing portion; And / or, the upper locking member is provided with an in-position sensing portion, the frame is provided with an upper locking sensor, and the upper locking sensor detects the position of the in-position sensing portion.

9. An aircraft landing gear, characterized in that: A device comprising a frame and a retractable and locking mechanism for a landing gear as claimed in any one of claims 1 to 8; The upright column is hinged to the frame via the first frame hinge portion, the upper support rod is hinged to the frame via the second frame hinge portion, and the upper locking accessory is fixed to the frame via the frame fixing portion.

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