Upper locking mechanism of landing gear, aircraft landing gear and aircraft

Abstract

The present invention provides an aircraft landing gear and an upper locking mechanism thereof and an aircraft. The upper locking mechanism comprises a column, a lower support rod, an upper support rod, an upper locking assembly, an actuator assembly and an upper linkage. One end of the column is 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 locking 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 first end of the actuator assembly is hinged to the upper support rod and close to the second frame hinged portion, and the second end of the actuator assembly is hinged to the first end of the column; the actuator assembly is connected to the upper locking member through an upper linkage. The present invention has a small size, low cost and simple structure.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft structure design, and relates to an upper locking mechanism of a landing gear, an aircraft landing gear and an aircraft. 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 upper lock is unlocked by another actuator. This structure is relatively complex, large in size, heavy in weight and high in cost. Summary of the invention

[0003] The first object of the present invention is to provide a landing gear upper lock mechanism which is small in size, can meet the requirements of aircraft miniaturization, has low cost, simple structure, and can complete the retraction and extension of the landing gear and the locking of the upper lock with a single actuator.

[0004] A second object of the present invention is to provide an aircraft landing gear having the above-mentioned landing gear upper locking mechanism.

[0005] A third object of the present invention is to provide an aircraft having the above landing gear.

[0006] In order to achieve the above-mentioned first purpose, the upper lock mechanism of the landing gear provided by the present invention includes a column, a lower support rod, an upper support rod, an upper lock assembly, an actuator cylinder assembly and an upper linkage member, one end of the column is provided with a first frame hinge portion; the first end of the lower support rod is hinged to the middle part 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 portion; 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 portion ; The first end of the actuator assembly is hinged on the upper support rod and close to the second frame hinge part, and the second end of the actuator assembly is hinged on the first end of the column; the actuator assembly is connected to the upper locking member through the upper linkage member; when the actuator assembly contracts, the upper linkage member drives the upper locking member to separate from the upper locking accessory, and the column can be rotated to the lowered position, and the upper support rod and the lower support rod are relatively fixed; when the actuator assembly is extended, the upper support rod and the lower support rod can rotate relative to each other, and the upper linkage member drives the upper locking member 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 a single actuator assembly, and at the same time, the upper lock assembly can be driven by the upper linkage to achieve locking and unlocking when the landing gear is retracted, thereby reducing redundant parts and simplifying piping, reducing volume and reducing costs.

[0008] A further solution is that the upper locking piece is hinged to the column; the actuating cylinder assembly includes an actuating cylinder, a limiting plate, a movable connecting piece and a first hinge shaft; the first hinge shaft is arranged on the upper support rod, and the driving shaft of the actuating cylinder is hinged to the upper support rod through the first hinge shaft; the limiting plate is fixed to the first end of the column, and a limiting groove is provided on the limiting plate; the two ends of the movable connecting piece are respectively hinged to the actuating cylinder and the limiting plate; a limiting part is provided on the movable connecting piece, and the limiting part is movably arranged in the limiting groove; the limiting groove 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 part, and in the movement direction of the limiting part, the second blocking wall is close to the actuating cylinder relative to the first blocking wall; when the actuating cylinder contracts, the actuating cylinder drives the movable connecting piece to rotate, the limiting part abuts against the second blocking wall and drives the column to move to the lowered position; when the actuating cylinder is extended, the actuating cylinder drives the movable connecting piece to rotate in the opposite direction, the limiting part abuts against the first blocking wall and drives the column to move to the retracted position.

[0009] As can be seen from the above, a limiting groove is provided on the limiting plate, a limiting part is provided on the movable connecting piece, the limiting part is movably arranged in the limiting groove, the movement of the actuator drives the movable connecting piece to move, and the movable connecting piece cooperates with the first baffle wall and the second baffle wall of the limiting groove to drive the column to rotate.

[0010] A further solution is that when the limiting portion moves to abut against the second retaining wall, the upper locking member and the upper locking accessory are separated.

[0011] As can be seen from the above, the time for the limit part to move from the starting position to the ending position in the limit groove is greater than or equal to the time for the upper lock and the upper locking member to separate, thereby ensuring that the landing gear is smoothly lowered.

[0012] A further solution is that a first adjusting groove is further provided on the driving shaft of the actuating cylinder, the extending direction of the first adjusting groove is parallel to the telescopic direction of the actuating cylinder, and the first hinge shaft is slidably matched with the first adjusting groove.

[0013] As can be seen from the above, providing the first adjustment groove on the actuator drive shaft can optimize the overall structure, improve the stability of the overall structural movement, reduce related tolerance requirements, and reduce design difficulty.

[0014] A further solution is that the movable connecting part includes two intersecting connecting arms, the limiting portion is located at the connection between the two connecting arms and protrudes outward from the side walls of the connecting arms to form a limiting protrusion, and 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.

[0015] As can be seen from the above, the movable connecting part is a triangular connecting arm. The triangular connecting arm can ensure the structural strength while reducing the volume of the parts, can improve the freedom of movement of the actuator, can save space, and prevent interference between the actuator and the limit plate.

[0016] A further solution is that the upper linkage is an upper adjustment rod upper lock assembly which 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 adjustment rod are respectively hinged to the upper locking member and the actuator.

[0017] As can be seen from the above, the upper spring makes the upper locking part and the upper locking accessory cooperate more stably, and can offset the resonance occurring when the aircraft is running, and prevent the upper locking part from loosening due to vibration.

[0018] A further solution is that the upper adjustment rod includes 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 piece, and the second upper rod body is hinged to the actuator; the upper adjustment 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 adjustment screw, and by rotating the upper adjustment screw, the first upper rod body and the second upper rod body move closer or farther away.

[0019] As can be seen from the above, the upper adjustment rod adjusts the tightness of the locking part to prevent the upper locking part from being too tight and unable to be unlocked, or too loose and causing the locking state to be unstable. It is also convenient for fine-tuning to compensate for tolerance problems caused by replacing new parts.

[0020] A further solution is that an in-place sensing portion is provided on the upper locking member, and an upper locking sensor is provided on the frame. The upper locking sensor is used to detect whether the upper locking member and the upper locking accessory are locked in place, and the upper locking sensor detects the position of the in-place sensing portion.

[0021] As can be seen from the above, by setting up the upper locking sensor, it is possible to facilitate the assistance in whether it is locked in place, thereby further improving its safety.

[0022] In order to achieve the above-mentioned second purpose, the present invention provides an aircraft landing gear, which includes a frame and an upper locking mechanism of any one of the above-mentioned landing gears; 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.

[0023] In order to achieve the third objective, the present invention provides an aircraft including the above-mentioned aircraft landing gear.

[0024] 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of an upper locking member of an upper locking mechanism embodiment of a landing gear of the present invention in a locked state.

[0026] Figure 2 It is a structural diagram of the landing gear in the lowered position according to an embodiment of the upper locking mechanism of the landing gear of the present invention.

[0027] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0028] Figure 4 It is a diagram of the first unlocked state of the upper locking member of the upper locking mechanism embodiment of the landing gear of the present invention.

[0029] Figure 5 It is a diagram of the second unlocking state of the upper locking member of the upper locking mechanism embodiment of the landing gear of the present invention.

[0030] Figure 6 It is a third unlocking state diagram of the upper locking member of the upper locking mechanism embodiment of the landing gear of the present invention.

[0031] Figure 7 It is a structural diagram of the movable connecting member of the upper locking mechanism embodiment of the landing gear of the present invention. DETAILED DESCRIPTION

[0032] See also Figures 1 to 3 The aircraft landing gear includes a frame, a tire (not shown) and an upper 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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

[0042] 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.

[0043] 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.

[0044] 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 upper locking mechanism of the landing gear includes: A column, wherein a first end of the column 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; It is characterized in that the upper locking mechanism of the landing gear 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; 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; An upper linkage member, through which the actuator assembly and the upper locking member are connected; When the actuating cylinder assembly contracts, the actuating cylinder assembly drives the upper linkage member to move, the upper linkage member drives the upper locking member to separate from the upper locking accessory, the column rotates to the lowered position, and the upper support rod is relatively fixed to the lower support rod; When the actuating cylinder assembly is extended, the upper support rod and the lower support rod can rotate relative to each other, the actuating cylinder assembly drives the upper linkage member to move, the upper linkage member drives the upper locking member to engage with the upper locking accessory, and the column is fixed in the retracted position.

2. The upper locking mechanism of the landing gear according to claim 1, characterized in that: The upper locking member is hinged to the column; The actuating cylinder assembly comprises an actuating cylinder, a limiting plate, a movable connecting piece and a first hinge shaft; The first hinge shaft is arranged on the upper support rod, and the driving shaft of the actuator cylinder is hinged to the upper support rod through the first hinge shaft; The limiting piece is fixed to the first end of the column, and a limiting groove is provided on the limiting piece; The two ends of the movable connecting member are respectively hinged to the actuating cylinder and the limiting plate; A limiting portion is provided on the movable connecting member, and the limiting portion is movably arranged in the limiting groove; The limiting groove 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 moving direction of the limiting portion, and the second blocking wall is closer to the actuator relative to the first blocking wall in the moving direction of the limiting portion; When the actuating cylinder contracts, the actuating cylinder drives the movable connecting member to rotate, and the limiting portion abuts against the second retaining wall and drives the column to move to the lowering position; When the actuating cylinder is extended, the actuating cylinder drives the movable connecting member to rotate in the opposite direction, and the limiting portion abuts against the first retaining wall and drives the column to move to the retracted position.

3. The upper locking mechanism of the landing gear according to claim 2, characterized in that: When the limiting portion moves to abut against the second blocking wall, the upper locking member and the upper locking accessory are separated.

4. The upper locking mechanism of the landing gear according to claim 2, characterized in that: The movable connecting member includes two intersecting connecting arms, the limiting portion is located at the connection between the two connecting arms and protrudes outward from the side walls of the connecting arms to form a limiting protrusion, and 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.

5. The upper locking mechanism of the landing gear according to claim 2, characterized in that: A first adjusting groove is also provided on the driving shaft of the actuating cylinder. The extending direction of the first adjusting groove is parallel to the telescopic direction of the actuating cylinder. The first hinge shaft is slidably matched with the first adjusting groove.

6. The upper locking mechanism of the landing gear according to any one of claims 2 to 5, 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.

7. The upper locking mechanism of the landing gear according to claim 6, 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.

8. The upper locking mechanism of the landing gear according to any one of claims 1 to 5, characterized in that: The upper locking member is provided with an in-position sensing portion, and 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 landing gear upper locking mechanism comprising a frame and a landing gear according to 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.

10. An aircraft, characterized in that The aircraft landing gear comprising the above-mentioned claim 9.

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