Tail airplane wheel anti-deflection mechanism capable of being manually unlocked and automatically locked

Abstract

A tail airplane wheel anti-deflection mechanism capable of being manually unlocked and automatically locked comprises a shell, a piston, a lock pin assembly, a touch rod, a lock washer, a limiting nut, a spring, a manual rod and a wheel fork hole, the piston penetrates through an inner hole of the shell, the manual rod is located in the piston and coaxially arranged with the piston, the manual rod extends out of the end of the piston, the manual rod can slide in the piston, and the lock pin assembly is located in the shell. The position, extending out of the piston, of the manual rod is sleeved with a spring and a limiting nut, the spring is located in an inner hole of the limiting nut, the lock pin assembly comprises a U-shaped connector, a self-locking nut, a pin rod, a knuckle bearing and a lock pin, the U-shaped connector is provided with a through hole, the lock pin is provided with the knuckle bearing, and the pin rod penetrates through the knuckle bearing and the through hole of the U-shaped connector to connect the lock pin with the U-shaped connector. The U-shaped connector is connected with the manual rod through threads, the touch rod is arranged between the U-shaped connector and the limiting nut in a sleeved mode, a lock washer is arranged between the touch rod and the limiting nut, and the end, away from the U-shaped connector, of the lock pin extends into a wheel fork hole.

Description

Technical Field

[0001] The invention relates to the technical field of helicopter landing gear, and in particular to a tail wheel anti-deflection mechanism which can be manually unlocked and automatically locked. Background Art

[0002] The helicopter tail wheel is provided with an anti-deflection mechanism, which is generally composed of a locking pin extending into the wheel fork hole of the wheel to prevent the tail wheel from deflecting. It is a key component on the helicopter landing gear, but the existing anti-deflection mechanism is inconvenient and laborious to operate manually when unlocked. Summary of the invention

[0003] In order to solve the problems mentioned in the above background technology, the present invention provides a tail wheel anti-deflection mechanism that can be manually unlocked and automatically locked.

[0004] The present invention discloses the following technical scheme: a tail wheel anti-deflection mechanism capable of manual unlocking and automatic locking, comprising a housing, a piston, a locking pin assembly, a trigger rod, a stop washer, a limit nut, a spring, a manual rod and a wheel fork hole, wherein the piston passes through an inner hole of the housing, the manual rod is located in the piston and is coaxially arranged with the piston and extends out of the end of the piston, the manual rod can slide in the piston, a spring and a limit nut are sleeved at the position where the manual rod extends out of the piston, the spring is located in the inner hole of the limit nut, and both ends of the spring are respectively in contact with the end face of the piston and the end face of the limit nut; the locking pin assembly comprises: The U-shaped joint, a self-locking nut, a pin rod, a spherical bearing and a locking pin, wherein the U-shaped joint is provided with a through hole, the locking pin is provided with a spherical bearing, one end of the locking pin extends into the U-shaped joint, so that the inner ring of the spherical bearing is coaxial with the through hole on the U-shaped joint, the pin rod passes through the spherical bearing and the through hole of the U-shaped joint to connect the locking pin to the U-shaped joint, the self-locking nut is used to fix the pin rod, the U-shaped connector is connected to the manual rod through a thread, the trigger rod is sleeved between the U-shaped connector and the limit nut, a stop washer is provided between the trigger rod and the limit nut, and the end of the locking pin away from the U-shaped connector extends into the fork hole.

[0005] Furthermore, a straight groove is provided at one end of the manual rod close to the trigger rod, and a boss is provided in the inner hole where the trigger rod is sleeved between the manual rod and the U-shaped connecting head, and a boss is also provided in the inner hole of the stop washer. During installation, the bosses in the two inner holes extend into the straight groove, and the outer circular boss of the stop washer is bent to the end faces of the limit nut and the trigger rod respectively.

[0006] Furthermore, a washer is provided at the connection between the self-locking nut and the U-shaped joint.

[0007] Furthermore, a sealing ring is provided between the housing and the piston.

[0008] Beneficial effect: Compared with the prior art, the tail wheel anti-deflection mechanism of the present invention which can be manually unlocked and automatically locked is realized by setting a manual rod, a spring, a limit nut, a trigger rod and a locking pin assembly. The spring pushes the locking pin assembly so that the locking pin extends into the wheel fork hole, thereby realizing automatic locking of the wheel. When manually unlocking, it is only necessary to push the trigger rod to compress the spring, move the manual rod, the limit nut and the locking pin assembly, and withdraw the locking pin from the wheel fork hole to realize unlocking. The structure is simple and reliable, and the operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the overall structure of the present invention, Figure 2 It is a cross-sectional schematic diagram of the present invention; Figure 3 It is a schematic diagram of the installation of the stop washer of the present invention; In the figure: 1-housing, 2-piston, 3-locking pin assembly, 4-touch rod, 5-stop washer, 6-limiting nut, 7-spring, 8-manual rod, 9-sealing ring, 10-wheel fork hole, 301-U-type joint, 302-self-locking nut, 303-pin rod, 304-washer, 305-spherical bearing, 306-locking pin. DETAILED DESCRIPTION

[0010] like Figures 1 to 3 As shown, the tail wheel anti-deflection mechanism which can be manually unlocked and automatically locked comprises a housing 1, a piston 2, a locking pin assembly 3, a trigger rod 4, a stop washer 3045, a limit nut 6, a spring 7, a manual rod 8 and a wheel fork hole 10. The piston 2 passes through the inner hole of the housing 1, the manual rod 8 is located in the piston 2 and is coaxially arranged with the piston 2 and extends out of the end of the piston 2, the manual rod 8 can slide in the piston 2, and the manual rod 8 is extended out of the piston 2 and is sleeved with a spring 7 and a limit nut 6, the spring 7 is located in the inner hole of the limit nut 6, and the two ends of the spring 7 are respectively abutted against the end surface of the piston 2 and the end surface of the limit nut 6; the locking pin assembly 3 comprises a U-shaped joint 301, a self-locking nut 302, a pin rod 303, a spherical bearing 305 and a locking pin 306, The U-shaped joint 301 is provided with a through hole, and the locking pin 306 is provided with a joint bearing 305. One end of the locking pin 306 extends into the U-shaped joint 301, so that the inner ring of the joint bearing 305 is coaxial with the through hole on the U-shaped joint 301, and the pin rod 303 passes through the through holes of the joint bearing 305 and the U-shaped joint 301 to connect the locking pin 306 with the U-shaped joint 301. The pin rod 303 is fixed with a self-locking nut 302. The U-shaped connector is connected to the manual rod 8 through a thread, which is convenient for disassembly and maintenance. The trigger rod 4 is sleeved between the U-shaped connector and the limit nut 6. A stop washer 3045 is provided between the trigger rod 4 and the limit nut 6 to prevent the trigger rod 4 from rotating. The end of the locking pin 306 away from the U-shaped connector extends into the wheel fork hole 10 to prevent the wheel from deflecting.

[0011] The manual rod 8 is provided with a straight groove at one end close to the trigger rod 4, and the trigger rod 4 is sleeved on the manual rod 8 and the inner hole at the U-shaped connector and is provided with a boss, and the inner hole of the stop washer 3045 is also provided with a boss. During installation, the bosses in the two inner holes extend into the straight groove, and the outer cylindrical boss of the stop washer 3045 is bent to the end faces of the limit nut 6 and the trigger rod 4 respectively, which plays a role of tightening and limiting, and effectively prevents the manual rod 8 and the trigger rod 4 from rotating; a washer 304 is provided at the connection between the self-locking nut 302 and the U-shaped joint 301 to prevent the self-locking nut 302 from loosening; a sealing ring 9 is provided between the housing 1 and the piston 2 to prevent leakage of fluid media such as hydraulic oil.

[0012] The free state of the anti-deflection mechanism is an automatic locking state, and the spring 7 pushes the limit nut 6 and the locking pin assembly 3, so that the locking pin 306 of the locking pin assembly 3 extends into the wheel fork hole 10 to realize automatic locking and prevent the wheel from deflecting; when manual unlocking is required, the trigger rod 4 is pushed to move to the left, the spring 7 is compressed, the limit nut 6 and the manual rod 8 move to the left, and the locking pin assembly 3 moves to the left, so that the locking pin 306 exits the wheel fork hole 10 to realize the unlocking action; when the manual unlocking operation is released, the automatic locking state is restored under the elastic resetting action of the spring 7.

[0013] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tail wheel anti-deflection mechanism capable of manual unlocking and automatic locking, characterized in that: The invention comprises a housing (1), a piston (2), a locking pin assembly (3), a trigger rod (4), a stop washer (5), a limit nut (6), a spring (7), a manual rod (8) and a wheel fork hole (10); the piston (2) passes through the inner hole of the housing (1); the manual rod (8) is located in the piston (2) and is coaxially arranged with the piston (2) and extends out of the end of the piston (2); the manual rod (8) can slide in the piston (2); a spring (7) and a limit nut (6) are sleeved at the position where the manual rod (8) extends out of the piston (2); the spring (7) is located in the inner hole of the limit nut (6); two ends of the spring (7) are respectively in contact with the end surface of the piston (2) and the end surface of the limit nut (6); the locking pin assembly (3) comprises a U-shaped joint (301), a self-locking nut (302), a pin rod (303), a joint bearing (305) and a plurality of other parts. and a locking pin (306), wherein the U-shaped joint (301) is provided with a through hole, the locking pin (306) is provided with a joint bearing (305), one end of the locking pin (306) extends into the U-shaped joint (301), so that the inner ring of the joint bearing (305) is coaxial with the through hole on the U-shaped joint (301), the pin rod (303) passes through the joint bearing (305) and the through hole of the U-shaped joint (301) to connect the locking pin (306) to the U-shaped joint (301), the pin rod (303) is fixed by a self-locking nut (302), the U-shaped connector is connected to the manual rod (8) through a thread, the trigger rod (4) is sleeved between the U-shaped connector and the limit nut (6), a stop washer (5) is provided between the trigger rod (4) and the limit nut (6), and the end of the locking pin (306) away from the U-shaped connector extends into the wheel fork hole (10).

2. The tail wheel anti-deflection mechanism capable of manual unlocking and automatic locking according to claim 1, characterized in that: The manual rod (8) is provided with a slot at one end close to the trigger rod (4), and the trigger rod (4) is sleeved in the manual rod (8) and has a boss in the inner hole at the U-shaped connector. The inner hole of the stop washer (5) is also provided with a boss. When installing, the bosses in the two inner holes extend into the slot, and the outer cylindrical boss of the stop washer (5) is bent to the end faces of the limit nut (6) and the trigger rod (4), respectively.

3. The tail wheel anti-deflection mechanism capable of manual unlocking and automatic locking according to claim 1, characterized in that: A washer (304) is provided at the connection between the self-locking nut (302) and the U-shaped joint (301).

4. The tail wheel anti-deflection mechanism capable of manual unlocking and automatic locking according to claim 1, characterized in that: A sealing ring (9) is provided between the housing (1) and the piston (2).

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