Anti-twist device with self-lubricating function and helicopter

Abstract

The application provides a twist-proof device with a self-lubricating function, which comprises a first twist-proof arm, a second twist-proof arm, and a mounting shaft with a self-lubricating structure, wherein the first twist-proof arm and the second twist-proof arm are connected with an outer cylinder and a piston rod through the mounting shaft; the first twist-proof arm is connected with the second twist-proof arm through a connecting shaft, and an upper end face is attached to a lower end face; and the application provides a lubricated twist-proof device and an airplane with the same, which solves the twist-proof problem and the lubrication problem of a helicopter front / tail landing gear in the prior art.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of helicopter landing devices, and particularly relates to a torsion-proof device with a self-lubricating function and a helicopter. BACKGROUND

[0002] For a general three-point helicopter, the outer cylinder of the strut-type front / rear landing gear is connected to the fuselage structure through bolts or mounting shafts, and the outer cylinder is fixed relative to the fuselage structure, while the piston rod and the wheel of the strut-type front / rear landing gear can rotate relative to the axis of the outer cylinder. Therefore, for the design of the landing device of a three-point helicopter, a torsion-proof device is usually designed to buffer the transmission of the rotation torque between the piston rod and the outer cylinder when the strut-type front / rear landing gear participates in ground turning, and the torsion-proof device is used to transmit the shimmy to a shimmy damper or other mechanisms to prevent the helicopter from shimmying when the helicopter is taxiing.

[0003] At present, the design of the torsion-proof device of the helicopter landing device is generally divided into two parts, the upper half is connected and mounted on the outer cylinder of the strut-type front / rear landing gear through bolts or pins, and the lower half is connected and mounted on the piston rod of the strut-type front / rear landing gear through bolts or pins, and the two parts are connected together through bolts or pins. The outer cylinder and the piston rod can move vertically along the axis, so the upper and lower parts of the torsion-proof device should be able to rotate around the mounting axis, and the position of the rotating shaft needs to have good lubrication effect to facilitate flexible rotation. SUMMARY

[0004] In view of the above technical problems, in a first aspect, the application provides a torsion-proof device with a self-lubricating function, which comprises:

[0005] A first torsion-proof arm comprising a lower end face;

[0006] A second torsion-proof arm comprising an upper end face;

[0007] A mounting shaft comprising a self-lubricating structure, wherein the first torsion-proof arm and the second torsion-proof arm are connected to the outer cylinder and the piston rod through the mounting shaft;

[0008] The first torsion-proof arm and the second torsion-proof arm are connected through a connecting shaft, and the upper end face and the lower end face are in contact.

[0009] Preferably, the first torsion-proof arm is connected to the outer cylinder through the mounting shaft, the second torsion-proof arm is connected to the piston rod through the mounting shaft, the upper end face and the lower end face are in contact and extrude to transmit lateral load, and the rotation freedom degree between the outer cylinder and the piston rod is limited.

[0010] Preferably, the mounting shaft comprises a lubricating hole and a first grease injection hole, and the torsion-proof device further comprises:

[0011] The lubricating rod comprises a second grease injection hole and a groove cavity; wherein the lubricating rod is arranged in the mounting shaft, and the first grease injection hole corresponds to the second grease injection hole.

[0012] Preferably, the anti-twist device further comprises:

[0013] The grease injection assembly can be inserted into the first grease injection hole and / or the second grease injection hole; wherein the grease injection assembly comprises a lubricating screw and a lubricating nozzle body connected by threads.

[0014] Preferably, the lubricating rod is inserted into the inner hole of the mounting shaft to form a matching cavity; wherein the matching cavity is injected with grease, and when the grease is saturated, it overflows through the lubricating hole channel to contact the surface of the shaft sleeve formed by the mounting shaft, the first anti-twist arm or the second anti-twist arm, and the lug of the outer cylinder or the piston rod, and forms a lubricating film, thereby achieving lubrication of the rotating structure.

[0015] Preferably, one end of the first anti-twist arm and the second anti-twist arm is provided with a lug; the lug is connected with the outer cylinder or the piston rod through the mounting shaft.

[0016] Preferably, the anti-twist device further comprises:

[0017] The support sleeve is arranged on the mounting shaft; wherein the support sleeve is arranged between the two lugs of the first anti-twist arm and the second anti-twist arm;

[0018] The first anti-twist arm comprises a stop boss, and the first anti-twist arm and / or the second anti-twist arm is provided with a groove, and the bottom of the groove is provided with a drain hole; the anti-twist arm is in a triangular structure.

[0019] In a second aspect, the application further provides a helicopter comprising the anti-twist device with self-lubricating function as described above.

[0020] The application has the following beneficial technical effects:

[0021] The application provides a lubricating anti-twist device and an aircraft comprising the same, which solves the anti-twist problem of the front / tail landing gear of a helicopter and the lubrication problem thereof. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The anti-twist device provided by the embodiment of the application is shown in the figure;

[0023] Figure 2 The anti-twist device provided by the embodiment of the application is shown in the figure;

[0024] Figure 3 The anti-twist device provided by the embodiment of the application is shown in the figure;

[0025] Figure 4 is a schematic view of a drain hole provided by an embodiment of the present application;

[0026] Figure 5 is an A-A cross-sectional view provided by an embodiment of the present application;

[0027] Figure 6 is a B-direction view provided by an embodiment of the present application;

[0028] Figure 7 is an installation shaft view provided by an embodiment of the present application;

[0029] Figure 8 is a lubricating rod view provided by an embodiment of the present application;

[0030] wherein 1 is a first anti-twist arm; 2 is a second anti-twist arm; 3 is an installation shaft; 4 is a grease injection assembly; 5 is a slotted nut; 6 is a connecting shaft; 7 is a stop boss; 8 is a piston rod; 9 is a support sleeve; 10 is an outer cylinder; 11 is a lower end face; 12 is an upper end face; 13 is a drain hole; 14 is a lubricating rod; 15 is a sealing ring; 16 is a lubricating screw; 17 is a lubricating nozzle body; 18 is a lubricating hole; 19 is a cavity; 20 is a first grease injection hole; 21 is a second grease injection hole; and 22 is a slot. DETAILED DESCRIPTION

[0031] Please refer to Figures 1-8 In the embodiment of the present application, as Figure 1 the anti-twist device is divided into a first anti-twist arm 1 and a second anti-twist arm 2, the first and second anti-twist arms are connected through a connecting shaft 6, the connecting shaft 6 is provided with a slotted nut 5 and is provided with a split pin to prevent loosening, the upper end portion of the first anti-twist arm 1 is connected with the outer cylinder 10 through an installation shaft 3, and the lower end portion of the second anti-twist arm 2 is connected with the piston rod 8 through an installation shaft 3. The lower end face 11 of the first anti-twist arm 1 is attached to the upper end face 12 of the second anti-twist arm 2, and the lateral load is transmitted through the extrusion of the lower end face 11 and the upper end face 12, so as to limit the rotational freedom between the outer cylinder 10 and the piston rod 8, and the relative rotation between the two is prevented. The first anti-twist arm 1 has a stop boss 7 at the lower portion, the stop boss 7 is attached to one of the six flat surfaces at the end of the connecting shaft 6 to limit the rotation of the connecting shaft 6, and has the stop ability for the connecting shaft 6. The first anti-twist arm 1 has a drain hole 13 at the lower portion of the web face, which Figure 4 can prevent the accumulation of water due to the hollowed-out configuration of the middle portion of the first anti-twist arm 1 and the failure to drain in time. The first anti-twist arm 1 has a support sleeve 9 between the two ear pieces, which enhances the longitudinal stiffness between the two ear pieces of the first anti-twist arm 1; similarly, the second anti-twist arm 2 has a support sleeve 9 between the two ear pieces, which enhances the longitudinal stiffness between the two ear pieces of the second anti-twist arm 2.

[0032] wherein the installation shaft 3 has a lubricating hole 18 and a first grease injection hole 20, as Figure 7 ; the lubricating rod 14 has a second grease injection hole 21, asFigure 8 The mounting shaft 3 and the shaft sleeve surface formed by the lug of the first anti-twist arm 1 and the lug of the outer cylinder 10 have a rotating friction pair; similarly, the mounting shaft 3 and the shaft sleeve surface formed by the lug of the second anti-twist arm 2 and the lug of the piston rod 8 have a rotating friction pair, as shown in Figure 5 The lubricating rod 14 is inserted into the inner hole of the mounting shaft 3 to form a matching chamber 19, and the chamber 19 is filled with lubricating grease. When the lubricating grease is saturated, it will overflow through the lubricating hole 18 into the contact surface of the shaft sleeve surface formed by the mounting shaft 3 and the first anti-twist arm 1 or the second anti-twist arm 2 and the lug of the outer cylinder 10 or the lug of the piston rod 8, and form a lubricating film, achieving lubrication of the rotating structure. The lubricating screw 16 and the lubricating nozzle body 17 are fastened together by threads to form a lubricating assembly 4, as shown in Figure 6 The first lubricating hole 20 and the second lubricating hole 21 are inserted into the overall structure formed by the mounting shaft 3 and the lubricating rod 14. When it is necessary to add lubricating grease 7014, lubricating grease can be injected from the lubricating nozzle body 17 with the help of external oil injection tools. The lubricating rod 14 has a groove cavity 22 at both ends, which can install a sealing ring 15 to prevent lubricating grease from leaking from the chamber 19.

[0033] It should be noted that:

[0034] 1. The lubricating nozzle body 17 is detachable, and can be replaced when it is damaged;

[0035] 2. The connecting shaft 6 has two mechanical anti-loosening measures, namely the groove nut 5 and the stop boss 7, which effectively prevent the connecting shaft 6 from loosening;

[0036] 3. The mounting shaft 3 has a lubricating hole 18 that can serve as a passage for lubricating grease to enter the rotating friction surface; it also has a first lubricating hole 20 that provides a lubricating passage;

[0037] 4. The mounting shaft 3 and the lubricating rod 14 form a matching chamber 19, and the chamber 19 is filled with lubricating grease 7014. The lubricating grease enters the rotating friction surface between the first anti-twist arm 1 (or the second anti-twist arm 2) and the mounting shaft 3 through the structural design of the mounting shaft 3, and has lubricating ability;

[0038] 5. The first anti-twist arm 1 is designed with a drain hole 13 to prevent water accumulation from being unable to drain;

[0039] 6. The lubricating rod 14 is designed with a groove cavity 22 that can accommodate a sealing ring or a sealing agent, providing good sealing effect performance;

[0040] 7. The lubricating screw 16 and the lubricating nozzle body 17 are connected with a safety wire to prevent loosening.

[0041] The anti-twist device has the following advantages:

[0042] 1. The lubrication nozzle 17 is designed on the outermost side and connects to the external grease injection tool, concentrating the potential for damage on the lubrication nozzle 17; the lubrication nozzle 17 is designed as a removable structure and can be replaced when damaged.

[0043] 2. The mounting shaft 3 and the lubrication rod 14 form a mating chamber 19. The chamber 19 is filled with lubricating grease 7014. The lubricating grease enters the rotating friction surface between the first anti-torsion arm 1 (second anti-torsion arm 2) and the mounting shaft 3 through the structural design of the mounting shaft 3, and has the ability to lubricate, which can reduce the wear of the rotating structure.

[0044] 3. The chamber 19 contains 7014 grease (not limited to) which can be continuously replenished into the rotating friction surface, maintaining a long-term lubrication effect and providing higher lubrication reliability than simply applying grease to the rotating friction surface.

[0045] 4. The lubrication components of the anti-torsion device do not need to be replaced during normal use and can be used until the product reaches the end of its service life;

[0046] 5. If grease needs to be replenished, it can be injected through the lubrication nozzle 17 without disassembling parts, making the operation convenient;

[0047] 6. The anti-torsion device, consisting of the first anti-torsion arm 1 and the second anti-torsion arm 2, has a simple structural design, is easy to process and manufacture, and has a good force transmission effect.

[0048] 7. The anti-torsion device, specifically the first anti-torsion arm 1 and the second anti-torsion arm 2, is easy to install and has higher installation reliability.

Claims

1. An anti-torsion device with self-lubricating function, characterized in that, The anti-twist device comprises: a first anti-twist arm comprising a lower end face; a second anti-twist arm comprising an upper end face; a mounting shaft comprising a self-lubricating structure, wherein the first anti-twist arm and the second anti-twist arm are connected with the outer cylinder and the piston rod through the mounting shaft; wherein the first anti-twist arm is connected with the second anti-twist arm through a connecting shaft, and the upper end face is attached to the lower end face; the first anti-twist arm has a stop boss at the lower part, which is attached to one of the six flat surfaces of the end head of the connecting shaft to limit the rotation of the connecting shaft, and has the ability to stop the connecting shaft; the mounting shaft comprises a lubricating hole and a first grease injection hole; the anti-twist device further comprises: a lubricating rod comprising a second grease injection hole and a groove cavity; wherein the lubricating rod is arranged in the mounting shaft, and the first grease injection hole corresponds to the second grease injection hole; the anti-twist device further comprises: a grease injection assembly capable of being inserted into the first grease injection hole and / or the second grease injection hole; wherein the grease injection assembly comprises a lubricating screw and a lubricating nozzle body connected through threads.

2. The anti-twist device according to claim 1, characterized in that The first anti-twist arm is connected with the outer cylinder through the mounting shaft, and the second anti-twist arm is connected with the piston rod through the mounting shaft, and the upper end face is attached to the lower end face to extrude and transfer the lateral load, thereby limiting the rotational freedom degree between the outer cylinder and the piston rod.

3. The anti-twist device according to claim 1, characterized in that The lubricating rod is inserted into the inner hole of the mounting shaft to form a matching chamber; wherein the matching chamber is injected with lubricating grease, and after the lubricating grease is saturated, it overflows through the lubricating hole channel to contact the surface of the shaft sleeve composed of the mounting shaft, the first anti-twist arm or the second anti-twist arm, and the outer cylinder lug or the piston rod lug, and forms a layer of lubricating film, thereby realizing the lubrication of the rotating structure.

4. The anti-twist device according to claim 1, characterized in that One end of the first anti-twist arm and the second anti-twist arm is provided with a lug; the lug is connected with the outer cylinder or the piston rod through the mounting shaft.

5. The anti-twist device according to claim 4, characterized in that The anti-twist device further comprises: a support sleeve arranged on the mounting shaft; wherein the support sleeve is arranged between the two lugs of the first anti-twist arm and the second anti-twist arm; a groove is arranged on the first anti-twist arm and / or the second anti-twist arm, and a drain hole is arranged at the bottom of the groove; the anti-twist arm is a triangular structure.

6. A helicopter characterized by An anti-twist device with self-lubricating function is provided, comprising any one of the anti-twist devices according to claims 1-5.

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