Cabin door connecting rod suitable for large-swing-angle folding and unfolding of connecting rod

Abstract

The invention belongs to the technical field of aircraft structure design, and relates to a cabin door connecting rod suitable for large-swing-angle folding and unfolding of the connecting rod. The cabin door connecting rod comprises a pull rod joint (1), a pull rod connecting bolt (4), a pull rod pipe fitting (7), a connecting joint (8) and a cross joint (11), one end of the pull rod joint (1) is connected with an undercarriage lug, the other end of the pull rod joint (1) is hinged to the pull rod connecting bolt (4), the other end of the pull rod connecting bolt (4) is sleeved with the pull rod pipe fitting (7) through threads, and the other end of the pull rod pipe fitting (7) is rotationally connected with the connecting joint (8). The connecting joint (8) is provided with two lugs, and the cross joint (11) is rotationally connected between the two lugs and used for being connected with a cabin door. The undercarriage and the cabin door are connected through the double universal joints, a large connecting rod swing angle can be achieved, and linkage of the cabin door can be adapted.

Description

Technical Field

[0001] The present application belongs to the technical field of aircraft structure design, and in particular relates to a door connecting rod that is adaptable to the retraction and extension of the connecting rod at a large swing angle. Background Art

[0002] When the landing gear is retracted or extended, the landing gear rotation is used to link the retraction and extension of the cabin door. Since the rotation axis directions of the landing gear and the cabin door are inconsistent, when the landing gear door is retracted or extended using a single-link linkage, the connection point between the landing gear and the cabin door needs to have a large spatial rotation angle. Therefore, it is necessary to design a connecting rod structure that can adapt to large-angle spatial rotation and linkage retraction and extension. Summary of the invention

[0003] In order to solve the above problems, the present application provides a door connecting rod that can adapt to the large swing angle of the connecting rod, which mainly includes a tie rod joint, a tie rod connecting bolt, a tie rod pipe fitting, a connecting joint and a cross joint;

[0004] Among them, one end of the tie rod joint is connected to the landing gear ear, and the other end is hinged to the tie rod connecting bolt. The other end of the tie rod connecting bolt is threadedly sleeved in the tie rod pipe fitting, and the other end of the tie rod pipe fitting is rotatably connected to the connecting joint. The connecting joint has two ears, and the cross joint is rotatably connected between the two ears. The cross joint is used to connect the cabin door.

[0005] Preferably, the tie rod joint and the landing gear ear are fixed by a tie rod joint nut.

[0006] Preferably, a lubrication channel is provided on the landing gear ear.

[0007] Preferably, at the hinged joint between the tie rod joint and the tie rod connecting bolt, the tie rod joint is provided with double ears, the tie rod connecting bolt is provided with a single ear, and the single ear and the double ears are connected by the connecting bolt.

[0008] Preferably, the width of both ears of the tie rod joint is wider than the width of a single ear of the tie rod connecting bolt.

[0009] Preferably, the connecting bolt has a lubrication passage leading to the single ear and the double ears.

[0010] Preferably, the tie rod pipe fitting is further provided with an external thread at one end connected to the tie rod connecting bolt, and is adapted to be connected with an adjusting nut. A strip groove extending along its axial direction is provided on the outer wall of the tie rod connecting bolt, and the strip groove is open at the end of the connecting rod bolt. A sliding stop pin is provided in the strip groove, and a notch is provided at the end of the tie rod pipe fitting. During the relative rotation of the tie rod pipe fitting and the tie rod connecting bolt, the strip groove can be aligned with the notch, and after one end of the stop pin slides out of the strip groove, it enters the notch, tightens the adjusting nut at the end of the tie rod pipe fitting, and connects the adjusting nut and the stop pin through a fuse.

[0011] Preferably, a plurality of notches are evenly distributed along the circumferential direction at the end of the pull rod pipe.

[0012] Preferably, the connecting joint has a through hole, and the end of the tie rod pipe passes through the through hole and is locked by a connecting rod nut.

[0013] Preferably, a lubrication channel is provided at the through hole of the connecting joint.

[0014] Preferably, the cross joint is fixed to the cross joint bolt by a bolt assembly, the cross joint is located between the two ears of the connecting joint, and the two ends of the cross joint bolt pass through the two ear through holes of the connecting joint respectively and are hinged at the two ears of the connecting joint.

[0015] Preferably, the cross joint bolt is provided with a lubrication channel leading to the double-ear through holes of the connecting joint.

[0016] Preferably, the width of the inner end faces of the two ears of the connecting joint is wider than the width of the outer end face of the cross joint.

[0017] Preferably, after the cross joint is connected to the hatch connecting bolts, it is fixed by means of the hatch connecting nuts.

[0018] Preferably, a lubrication channel leading to the hatch door connecting bolts is provided on the cross joint.

[0019] The present application connects the landing gear and the cabin door through a double universal joint, which can achieve a large connecting rod swing angle and can adapt to the cabin door linkage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a preferred embodiment of the hatch connecting rod of the present application that is suitable for retracting and extending the connecting rod at a large swing angle.

[0021] Figure 2 This application Figure 1 An enlarged schematic diagram of the structure at location A of the illustrated embodiment.

[0022] Among them, 1-tie rod joint, 2-tie rod joint nut, 3-connecting bolt, 4-tie rod connecting bolt, 41-strip groove, 5-stop pin, 6-adjusting nut, 7-tie rod pipe fitting, 71-notch, 8-connecting joint, 9-connecting rod nut, 10-connecting nut, 11-cross joint, 12-cross joint bolt, 13-bolt assembly. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the implementation of this application will be described in more detail in combination with the drawings in the implementation of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and cannot be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in combination with the drawings.

[0024] The present application provides a door connecting rod adapted to the large swing angle of the connecting rod. Figure 1 and Figure 2 As shown, it mainly includes a tie rod joint 1, a tie rod connecting bolt 4, a tie rod pipe fitting 7, a connecting joint 8 and a cross joint 11;

[0025] Among them, one end of the tie rod joint 1 is connected to the landing gear ear, and the other end is hinged to the tie rod connecting bolt 4. The other end of the tie rod connecting bolt 4 is threadedly sleeved in the tie rod pipe fitting 7. The other end of the tie rod pipe fitting 7 is rotatably connected to the connecting joint 8. The connecting joint 8 has two ears, and the cross joint 11 is rotatably connected between the two ears. The cross joint 11 is used to connect the cabin door.

[0026] The tie rod joint 1 and the tie rod connecting bolt 4 of the present application form a landing gear connecting universal joint, the connecting joint 8 and the cross joint 11 form a door connecting universal joint, and the tie rod pipe fitting 7 and the connecting joint form a door connecting rod axial rotation pair, thereby adapting to large-angle rotation and linkage retraction and extension in space. At the same time, the tie rod connecting bolt 4 and the tie rod pipe fitting 7 are threadedly connected, and the length of the door connecting rod can be adjusted to form a certain adjustment range for the retracted and extended position of the door.

[0027] In some optional embodiments, the tie rod joint 1 and the landing gear ear are fixed by a tie rod joint nut 2. The tie rod joint 1 is designed with a nut stopper, and its matching length is longer than the matching length of the landing gear ear.

[0028] In some optional embodiments, a lubrication channel is provided on the landing gear ear to ensure the rotational flexibility between the tie rod joint 1 and the landing gear ear.

[0029] In some optional embodiments, at the hinged joint between the tie rod joint 1 and the tie rod connecting bolt 4, the tie rod joint 1 is provided with double ears, the tie rod connecting bolt 4 is provided with a single ear, and the single ear and the double ears are connected by the connecting bolt 3. In this embodiment, when the landing gear is retracted or extended, the tie rod connecting bolt 4 can freely rotate relative to the tie rod joint 1 along the axis of the connecting bolt 3.

[0030] In some optional embodiments, the width of both ears of the tie rod joint 1 is wider than the width of a single ear of the tie rod connecting bolt 4 .

[0031] In some optional embodiments, the connecting bolt 3 has a lubrication channel leading to the single ear and the double ears.

[0032] The above two embodiments can make the rotation of the tie rod connecting bolt 4 relative to the tie rod joint 1 more flexible.

[0033] In some optional embodiments, the tie rod pipe fitting 7 is further provided with an external thread at one end connected to the tie rod connecting bolt 4, and is adapted to be connected with an adjusting nut 6. A strip groove 41 extending along its axial direction is provided on the outer wall of the tie rod connecting bolt 4, and the strip groove is open at the end of the connecting tie rod bolt 4. A sliding stop pin 5 is provided in the strip groove 41, and a notch 71 is provided at the end of the tie rod pipe fitting 7. During the relative rotation of the tie rod pipe fitting 7 and the tie rod connecting bolt 4, the strip groove 41 can be aligned with the notch 71. After one end of the stop pin 5 slides out of the strip groove 41, it enters the notch 71, tightens the adjusting nut 6 at the end of the tie rod pipe fitting 7, and connects the adjusting nut 6 to the stop pin 5 through a fuse.

[0034] In this embodiment, reference Figure 2 , move the stop pin 5 buried in the strip groove 41 of the tie rod connecting bolt 4 away from the tie rod pipe fitting 7 together with the adjusting nut 6. At this time, the threaded connection length of the tie rod connecting bolt 4 and the tie rod pipe fitting 7 can be changed to adjust the length of the hatch door tie rod. After adjustment, tighten the adjusting nut 6 against the tie rod pipe fitting 7, and insert the stop pin 5 into the notch 71 on the end face of the tie rod pipe fitting 7, and use a fuse to secure the stop pin 5 and the adjusting nut 6 to achieve the anti-rotation of the threaded connection of the hatch door tie rod.

[0035] In some optional embodiments, a plurality of notches 71 are evenly distributed along the circumferential direction at the end of the tie rod tube 7 .

[0036] In some optional embodiments, the connecting joint 8 has a through hole, and the end of the tie rod pipe 7 passes through the through hole and is locked by the connecting rod nut 9.

[0037] In some optional embodiments, a lubrication channel is provided at the through hole of the connecting joint 8. In this embodiment, after the tie rod pipe 7 and the connecting joint 8 are fixed by the connecting rod nut 9, a revolute pair is formed, and the connecting joint 8 rotates relative to the axis of the tie rod pipe 7, thereby releasing the relative rotational freedom between the universal joints at both ends of the door connecting rod. A suitable lubrication channel is designed at the revolute pair to ensure that the rotation between the tie rod pipe 7 and the connecting joint 8 is more flexible. In addition, a nut stopper is designed at the mating end of the tie rod pipe 7 and the connecting joint 8, and its mating length is longer than the mating width of the inner end surface and the outer end surface of the connecting joint 8.

[0038] In some optional embodiments, the cross joint 11 is fixed to the cross joint bolt 12 by a bolt assembly 13, the cross joint 11 is located between the two ears of the connecting joint 8, and the two ends of the cross joint bolt 12 respectively pass through the two ear through holes of the connecting joint 8 and are hinged at the two ears of the connecting joint 8.

[0039] refer to Figure 1 The cross joint bolt 13 is inserted into the connecting joint 8 and the cross joint 11, and the cross joint 11 is fixedly connected to the cross joint bolt 12 by the bolt assembly 13. When the hatch is retracted or released, the cross joint 11 can rotate freely along the axis of the cross joint bolt 12 relative to the connecting joint 8.

[0040] In some optional embodiments, a lubrication channel leading to the double-ear through holes of the connecting joint 8 is provided on the cross joint bolt 12 .

[0041] In some optional embodiments, the width of the inner end surfaces of the two ears of the connecting joint 8 is wider than the width of the outer end surface of the cross joint 11 .

[0042] In some optional embodiments, after the cross joint 11 is connected to the door connection bolt, it is fixed by the door connection nut 10. In this embodiment, the cross joint 11 can rotate freely relative to the door bolt along the axis of the connection nut 10 when retracting and releasing. In addition, the door connection bolt is designed with a nut stopper, and its matching length is longer than the matching width of the outer end surface of the cross joint 11.

[0043] In some optional embodiments, a lubrication channel leading to the door connecting bolts is provided on the cross joint 11.

[0044] After a large number of experiments, the results show that the present application can achieve large-angle spatial retraction and extension of the landing gear linkage door retraction link with fewer parts, and has the functions of link length adjustment and anti-rotation, easy lubrication of relatively rotating parts, high integration, flexible rotation and high reliability.

[0045] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A door connecting rod adapted to the retraction and extension of the connecting rod at a large swing angle, characterized in that: It comprises a tie rod joint (1), a tie rod connecting bolt (4), a tie rod pipe fitting (7), a connecting joint (8) and a cross joint (11); Among them, one end of the tie rod joint (1) is connected to the landing gear ear piece, and the other end is hinged to the tie rod connecting bolt (4). The other end of the tie rod connecting bolt (4) is threadedly sleeved in the tie rod pipe (7). The other end of the tie rod pipe (7) is rotatably connected to the connecting joint (8). The connecting joint (8) has two ears, and the cross joint (11) is rotatably connected between the two ears. The cross joint (11) is used to connect the cabin door.

2. The door connecting rod adapted to large swing angle retraction as claimed in claim 1, characterized in that: The tie rod joint (1) and the landing gear ear piece are fixed via a tie rod joint nut (2).

3. The door connecting rod adapted to large swing angle retraction as claimed in claim 2, characterized in that: The landing gear ear is provided with a lubrication channel.

4. The door connecting rod adapted to large swing angle retraction as claimed in claim 1, characterized in that: At the hinged joint between the tie rod joint (1) and the tie rod connecting bolt (4), the tie rod joint (1) is provided with double ears, and the tie rod connecting bolt (4) is provided with a single ear, and the single ear and the double ears are connected via a connecting bolt (3).

5. The door connecting rod adapted to large swing angle retraction as claimed in claim 4, characterized in that: The width of both ears of the tie rod joint (1) is wider than the width of a single ear of the tie rod connecting bolt (4).

6. The door connecting rod adapted to large swing angle retraction as claimed in claim 4, characterized in that: The connecting bolt (3) has a lubrication channel leading to the single ear and the double ears.

7. The door connecting rod adapted to large swing angle retraction as claimed in claim 1, characterized in that: The tie rod pipe fitting (7) is also provided with an external thread at one end connected to the tie rod connecting bolt (4), and is adapted to be connected with an adjusting nut (6). A strip groove (41) extending along its axial direction is provided on the outer wall of the tie rod connecting bolt (4), and the strip groove is open at the end of the connecting rod bolt (4). A sliding stop pin (5) is provided in the strip groove (41). A notch (71) is provided at the end of the tie rod pipe fitting (7). During the relative rotation of the tie rod pipe fitting (7) and the tie rod connecting bolt (4), the strip groove (41) can be aligned with the notch (71), and after one end of the stop pin (5) slides out of the strip groove (41), it enters the notch (71), tightens the adjusting nut (6) at the end of the tie rod pipe fitting (7), and connects the adjusting nut (6) and the stop pin (5) through a fuse.

8. The door connecting rod adapted to large swing angle retraction as claimed in claim 7, characterized in that: The end of the pull rod pipe (7) is evenly distributed with a plurality of notches (71) along the circumferential direction.

9. The door connecting rod adapted to large swing angle retraction of the connecting rod as claimed in claim 1, characterized in that: The connecting joint (8) has a through hole, and the end of the tie rod pipe (7) passes through the through hole and is locked by a connecting rod nut (9).

10. The door connecting rod adapted to large swing angle retraction as claimed in claim 9, characterized in that: A lubrication channel is provided at the through hole of the connecting joint (8).

11. The door connecting rod adapted to large swing angle retraction of the connecting rod as claimed in claim 1, characterized in that: The cross joint (11) is fixed to the cross joint bolt (12) via a bolt assembly (13); the cross joint (11) is located between two ears of the connecting joint (8); two ends of the cross joint bolt (12) respectively pass through the through holes of the two ears of the connecting joint (8) and are hinged at the two ears of the connecting joint (8).

12. The door connecting rod adapted to large swing angle retraction as claimed in claim 11, characterized in that: The cross joint bolt (12) is provided with a lubrication passage leading to the double-ear through holes of the connection joint (8).

13. The door connecting rod adapted to large swing angle retraction as claimed in claim 11, characterized in that: The width of the inner end faces of the two ears of the connecting joint (8) is wider than the width of the outer end face of the cross joint (11).

14. The door connecting rod adapted to large swing angle retraction of the connecting rod as claimed in claim 1, characterized in that: After the cross joint (11) is connected to the hatch door connecting bolt, it is fixed by the hatch door connecting nut (10).

15. The door connecting rod adapted to large swing angle retraction of the connecting rod as claimed in claim 14, characterized in that: The cross joint (11) is provided with a lubrication passage leading to the cabin door connecting bolts.

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