Cabin door pull rod mechanism

Abstract

The invention relates to the technical field of cabin door pull rods of aircraft tail booms, and particularly discloses a cabin door pull rod mechanism which comprises a length-adjustable cabin door pull rod, a cabin door connecting piece capable of axially rotating is axially mounted at one end of the cabin door pull rod, and a pull rod connector is hinged to the other end of the cabin door pull rod. A tail boom connecting piece capable of axially rotating is mounted at the lower part of the pull rod joint, and is fixedly connected with a tail boom of the airplane; the cabin door connecting piece is fixedly connected with a cabin door of the airplane. The opening and closing states of the cabin door are adjusted by forming a simple four-connecting-rod structure together with the airplane cabin door and the tail boom, the structure not only can realize various motion forms such as steering, stretching and rotating, but also can efficiently realize conversion of various motion forms, and the requirements of most complex mechanical motion of a mechanical system are met; and compared with some complex mechanical transmission devices, the structure is simple, parts are few, so that the parts are relatively easy to maintain and replace, and the maintenance difficulty and cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of a door pull rod of an aircraft tail support, in particular to a door pull rod mechanism. Background Art

[0002] The door lever mechanism is an important part of the aircraft door, among which the door lever is an important connection and transmission component, which is mainly responsible for transmitting and converting the opening and closing actions of the door. In the design of aircraft doors, the lever mechanism is usually used to achieve smooth opening and closing of the door, as well as to ensure the safety and reliability of the door during the opening and closing process.

[0003] The existing door pull rod mechanism has an overly complex structure, poor stability, and low transmission efficiency, and cannot guarantee reliability and safety during the door opening or closing process, and its structure needs to be further improved. Summary of the invention

[0004] The object of the present invention is to provide a door pull rod mechanism with a simple structure, fewer parts and relatively low maintenance cost.

[0005] The present invention is achieved through the following technical solutions: a door pull rod mechanism, comprising a door pull rod capable of adjusting the length, wherein a door connector capable of axial rotation is axially mounted on one end of the door pull rod, and a pull rod joint is hinged on the other end, a tail support connector capable of axial rotation is mounted on the lower part of the pull rod joint, and the tail support connector is fixedly connected to the tail support of the aircraft; the door connector is fixedly connected to the door of the aircraft.

[0006] The working principle of this technical solution is to adjust the opening and closing state of the cabin door mainly by forming a simple four-bar structure together with the aircraft cabin door and the tail strut. This structure can not only realize various forms of movement such as steering, telescoping, and rotation, but also can efficiently realize the conversion of various forms of movement, meeting the needs of most complex mechanical movements of the mechanical system.

[0007] In order to better realize the present invention, further, the cabin door connecting piece includes a U-shaped seat, the lower part of the U-shaped seat is sleeved on one end of the cabin door pull rod, and the U-shaped seat can rotate axially on the cabin door pull cylinder; a cross joint is embedded between the two ends of the upper part of the U-shaped seat, and a shaft sleeve is arranged in the middle of the cross joint, and the shaft sleeve is connected to the aircraft cabin door connecting shaft, and the cabin door pull rod extends out of the bottom of the U-shaped seat and is fixedly connected to the U-shaped seat by a fastener.

[0008] In order to better realize the present invention, further, a joint bearing is provided at the lower portion of the U-shaped seat, and a joint shaft matching it is provided at one end of the door pull rod. The door connector and the door pull rod are connected to the joint shaft at the end of the door pull rod through the joint bearing at the lower portion of the U-shaped seat, and a bearing ring for clamping the joint shaft is also provided in the joint bearing. A steel wire for tightening the bearing ring is also provided in the U-shaped seat, and both ends of the steel wire extend from one side of the lower portion of the U-shaped seat. The steel wire tightens the bearing ring to fix the joint bearing and the joint shaft, thereby fixing the door connector and the door pull rod.

[0009] In order to better implement the present invention, further, a plugging cover for sealing the joint bearing and the joint shaft is also provided at the bottom of the U-shaped seat.

[0010] In order to better realize the present invention, further, the cross joint includes an outer tube, both ends of the outer tube are respectively nested with bushings, a pin is embedded in the bushing, the pin passes through the upper part of the U-shaped seat and is inserted in the bushing to fix the outer tube to the upper part of the U-shaped seat, the free ends of the pins are also threadedly connected with oil nozzles, an oil filling cavity connected to the oil filling nozzle is arranged in the pin, and a plurality of oil filling holes connected to the internal oil filling cavity are also arranged on the side walls of the pins, and fixing parts passing through the pins are also arranged on both sides of the outer tube, and the pins are fixed to the outer tube through the fixing parts.

[0011] In order to better implement the present invention, further, the shaft sleeve is embedded in the middle of the outer tube, and an oil injection nozzle is arranged in the middle of the outer side of the outer tube, and the oil injection hole of the oil injection nozzle abuts against the shaft sleeve.

[0012] In order to better realize the present invention, further, the door pull rod includes a rod body in the middle, telescopic rods are embedded in both ends of the rod body, and the telescopic rods are fixed to the rod body by locking nuts. A joint shaft is installed on the telescopic rod at one end, and the joint shaft is connected to the door connecting piece, and an earring bolt with a radial spherical bearing installed in it is installed on the telescopic rod at the other end. The radial spherical bearing is hinged to the pull rod joint, and a fixing piece passing through the radial spherical bearing is provided on one side of the pull rod joint, and the radial spherical bearing is fixed to the pull cylinder joint through the fixing piece.

[0013] In order to better realize the present invention, further, the tail support connecting piece includes a connecting seat, the connecting seat is L-shaped, one side of the connecting seat is axially connected to the tie rod joint, one end of the tie rod joint extending out of the connecting seat is provided with a fixing piece, and the other side is symmetrically provided with connecting ears, and a plurality of connecting holes are provided on the symmetrically provided connecting ears, and the connecting holes are connected to the tail support of the aircraft, and each pair of connecting holes is provided with a fixing piece that penetrates the tail support of the aircraft to realize the fixed connection between the connecting holes and the tail support of the aircraft.

[0014] In order to better implement the present invention, further, the fixing member includes a bolt and a hexagonal slot nut matching the bolt, and a cotter pin is installed on the hexagonal slot nut.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] (1) The present invention forms a simple four-bar structure with the aircraft door and the tail strut to adjust the opening and closing state of the door. This structure can not only realize multiple motion forms such as turning, telescoping, and rotating, but also realize the conversion of multiple motion forms with high efficiency, meeting the requirements of most complex mechanical motions of the mechanical system;

[0017] (2) The present invention uses simple parts such as steel wire, cotter pin, hexagonal slot thin nut for axial preload and fixation. In addition, the existence of oiling nozzle and spherical bearing is to play the role of lubrication, reduce friction with the connecting parts, extend service life, reduce maintenance costs, etc. These simple parts are used to improve the stability and reliability of the overall mechanism;

[0018] (3) Compared with some complex mechanical transmission devices, the present invention has a relatively low maintenance cost. Due to its simple structure and few parts, it is relatively easy to repair and replace parts, which also reduces the difficulty and cost of maintenance. It can be used in the aviation, aerospace, automobile and other industries, and can provide various mechanical motion forms and a stable and reliable transmission environment for various large machines, which is suitable for wide promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments with reference to the following drawings:

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 It is a schematic diagram of an enlarged three-dimensional structure of a hatch door connecting member in the present invention;

[0022] Figure 3 A cross-sectional view of the connection between the U-shaped seat and the cross connector in the hatch connector of the present invention;

[0023] Figure 4 It is a cross-sectional view of the connection between the hatch door connecting member and the hatch door pull rod in the present invention;

[0024] Figure 5 It is a schematic diagram of the enlarged three-dimensional structure of the tie rod joint and the tail support connecting piece in the present invention;

[0025] Figure 6 It is a cross-sectional view of the tie rod joint and the tail support connecting piece in the present invention;

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the door pull rod in the present invention.

[0027] Among them: 1-door pull rod, 11-joint shaft, 12-rod body, 13-telescopic rod, 14-locking nut, 15-earring bolt, 16-radial spherical bearing, 2-door connecting piece, 21-U-shaped seat, 211-spherical bearing, 212-bearing ring, 213-steel wire, 214-blocking cover, 22-cross joint, 221-outer cylinder, 222-bushing, 223-pin shaft, 224-grease nozzle, 23-sleeve, 3-pull rod joint, 4-tail support connecting piece, 41-connecting seat, 42-connecting ear piece, 43-connecting hole, 5-fastener, 51-bolt, 52-hexagonal slot nut, 53-cotter pin. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Embodiment 1:

[0032] The main structure of this embodiment is as follows: Figure 1As shown, it comprises a door tie rod 1 with adjustable length, one end of which is axially mounted with a door connector 2 capable of axial rotation, and the other end is hinged with a tie rod joint 3, the lower part of which is mounted with an axially rotatable tail support connector 4, and the tail support connector 4 is fixedly connected to the tail support of the aircraft; the door connector 2 is fixedly connected to the door of the aircraft.

[0033] The tail support and the cabin door are connected by the cabin door tie rod 1 to form a four-bar linkage. During the retracting and lowering operation, the retracting and lowering actuator drives the tail support to rotate. Since a cabin door connector 2 capable of axial rotation is axially installed at one end of the cabin door tie rod 1, and a tie rod joint 3 is hinged at the other end, a tail support connector 4 capable of axial rotation is installed at the lower part of the tie rod joint 3, and the tail support connector 4 is fixedly connected to the tail support of the aircraft; the cabin door connector 2 is fixedly connected to the cabin door of the aircraft to ensure the stability and reliability of the overall structure. When the cabin door tie rod 1 rotates with the tail support of the aircraft, the cabin door connector 2 connected thereto will move together, and the cabin door connector 2 will push the cabin door to move together, realizing the linkage retracting and lowering of the tail support and the cabin door from beginning to end.

[0034] Embodiment 2:

[0035] Based on the above embodiment, this embodiment further defines the structure of the door connector 2, such as Figure 2 , Figure 3 , Figure 4 As shown, the door connector 2 includes a U-shaped seat 21, the lower part of which is sleeved on one end of the door pull rod 1, and the U-shaped seat 21 can rotate axially on the door pull cylinder 4; a cross joint 22 is embedded between the two ends of the upper part of the U-shaped seat 21, and a shaft sleeve 23 is provided in the middle of the cross joint 22, and the shaft sleeve 23 is connected to the aircraft door connecting shaft, and the door pull rod 1 extends out of the bottom of the U-shaped seat 21 and is fixedly connected to the U-shaped seat 1 through a fastener 5. The other parts of this embodiment are the same as the above embodiment and are not repeated here.

[0036] Embodiment 3:

[0037] Based on the above embodiment, this embodiment further defines the structure of the hatch connector 2, such as Figure 2 , Figure 3 , Figure 4As shown, a joint bearing 211 is provided at the lower part of the U-shaped seat 21, and a joint shaft 11 matching therewith is provided at one end of the door pull rod 1, and the door connector 2 and the door pull rod 1 are connected to the joint shaft 11 at the end of the door pull rod 1 through the joint bearing 211 at the lower part of the U-shaped seat 21, and a bearing ring 212 for clamping the joint shaft 11 is also provided in the joint bearing 211, and a steel wire 213 for tightening the bearing ring 212 is also provided in the U-shaped seat 21, and both ends of the steel wire 213 extend from one side of the lower part of the U-shaped seat 21, and the steel wire 213 tightens the bearing ring 212 so that the joint bearing 211 and the joint shaft 11 are fixed, thereby fixing the door connector 2 and the door pull rod 1. The other parts of this embodiment are the same as those of the above embodiment, and will not be repeated.

[0038] Embodiment 4:

[0039] Based on the above embodiment, this embodiment further defines the structure of the hatch connector 2, such as Figure 2 , Figure 3 , Figure 4 As shown, a plug cover 214 is also provided at the bottom of the U-shaped seat 21 to seal the joint bearing 211 and the joint shaft 11. The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail.

[0040] Embodiment 5:

[0041] Based on the above embodiment, this embodiment further defines the structure of the hatch connector 2, such as Figure 2 , Figure 3 , Figure 4 As shown, the cross joint 22 includes an outer tube 221, and bushings 222 are respectively embedded at both ends of the outer tube 221, and a pin 223 is embedded in the bushing 222. The pin 233 penetrates the upper part of the U-shaped seat 21 and is inserted in the bushing 222 to fix the outer tube 221 to the upper part of the U-shaped seat 21. The free ends of the pins 223 are also threadedly connected with oiling nozzles 224. An oiling cavity connected to the oiling nozzle 224 is provided in the pin 223, and a plurality of oiling holes connected to the internal oiling cavity are also provided on the side wall of the pin 223. Fixing members 5 penetrating the pin 223 are also provided on both sides of the outer tube 221, and the pin 223 is fixed to the outer tube 221 through the fixing members. The other parts of this embodiment are the same as those of the above embodiment and will not be repeated.

[0042] Embodiment 6:

[0043] Based on the above embodiment, this embodiment further defines the structure of the hatch connector 2, such as Figure 2 , Figure 3 , Figure 4As shown, the sleeve 23 is embedded in the middle of the outer cylinder 221, and an oiling nozzle 224 is provided in the middle of the outer side of the outer cylinder 221, and the oiling hole of the oiling nozzle 224 abuts against the sleeve 23. The other parts of this embodiment are the same as the above embodiment and will not be repeated.

[0044] Embodiment 7:

[0045] Based on the above embodiment, this embodiment further defines the structure of the door pull rod 1, such as Figure 7 As shown, the door pull rod 1 includes a rod body 12 in the middle, and telescopic rods 13 are embedded at both ends of the rod body 12. The telescopic rods 13 are fixed to the rod body 12 through locking nuts 14. A joint shaft 11 is installed on the telescopic rod 13 at one end, and the joint shaft 11 is connected to the door connector 2. An earring bolt 15 is installed on the telescopic rod 13 at the other end, and a radial spherical bearing 16 is installed inside. The radial spherical bearing 16 is hinged to the pull rod joint 3. A fixing member 5 penetrating the radial spherical bearing 16 is provided on one side of the pull rod joint 3. The radial spherical bearing 16 is fixed to the cylinder joint 3 through the fixing member 5. The door pull rod 1 plays an important role in transmission alternation and motion form change as a key component in the door pull rod mechanism, mainly converting the motion from the rotation of the door pull rod 1 to the telescopic movement of the aircraft door to realize the opening and closing of the aircraft door. This structure not only has good stability and low wear, but also has a long transmission distance and high transmission efficiency. The radial spherical bearing 16 is a self-lubricating bearing that can withstand a large load. When rotating to achieve torque transmission, it can reduce friction and extend the service life. The external thread on the surface of the earring bolt 15 is connected to the internal thread of the hatch pull rod 1. A locking nut 14 is set at the threaded connection position to strengthen the fixation of the earring bolt 15 and the hatch pull rod 0, which is convenient for adjustment and locking at the installation position to prevent loosening, and at the same time, it can also ensure the adjustment of the telescopic length of the earring bolt 15. The other parts of this embodiment are the same as the above embodiment and will not be repeated.

[0046] Embodiment 8:

[0047] Based on the above embodiment, this embodiment further defines the structure of the tail support connector 4, such as Figure 5 , Figure 6 As shown, the tail support connector 4 includes a connection seat 41, the connection seat 41 is L-shaped, one side of the connection seat 41 is axially connected to the tie rod joint 3, one end of the tie rod joint 3 extending out of the connection seat 41 is provided with a fixing member 5, and the other side is symmetrically provided with a connection ear piece 42, and the symmetrically provided connection ear pieces 42 are provided with a plurality of connection holes 43, the connection holes 42 are connected to the aircraft tail support, and each pair of connection holes 42 is provided with a fixing member 5 that penetrates the aircraft tail support to achieve a fixed connection between the connection holes 42 and the aircraft tail support. The other parts of this embodiment are the same as the above embodiment and will not be repeated.

[0048] Embodiment 9:

[0049] Based on the above embodiments, this embodiment further defines the structure of the fixing member 5, such as Figure 1 , Figure 2 , Figure 5 As shown, the fixing member 5 includes a bolt 51 and a hexagonal slot nut 52 matched with the bolt 51, and a split pin 53 is installed on the hexagonal slot nut 52. A large number of bolts 51, split pins 53, and hexagonal slot nuts 52 are used inside the components of the door pull rod mechanism to form the fixing member 5 for axial pre-tightening and fixing, so as to avoid axial sliding at the connection part of the door pull rod mechanism, which not only reduces the wear and scratches between the parts, reduces its service life and increases the maintenance cost, but also improves the stability, reliability and safety of the structure of the overall door pull rod mechanism. The other parts of this embodiment are the same as those of the above embodiment and will not be repeated.

[0050] It can be understood that the working principles and working processes of the door pull rod mechanism structure according to an embodiment of the present invention, such as the bolt 51, the hexagonal slot nut 52, and the cotter pin 53, are all prior arts and are well known to technicians in this field, and will not be described in detail here.

[0051] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A door pull rod mechanism, characterized in that: The invention comprises a door pull rod (1) capable of adjusting the length, wherein a door connector (2) capable of axial rotation is axially mounted on one end of the door pull rod (1), and a pull rod joint (3) is hingedly mounted on the other end, and a tail support connector (4) capable of axial rotation is mounted on the lower part of the pull rod joint (3), and the tail support connector (4) is fixedly connected to the tail support of the aircraft; and the door connector (2) is fixedly connected to the door of the aircraft.

2. A door pull rod mechanism according to claim 1, characterized in that: The door connecting member (2) comprises a U-shaped seat (21), the lower part of which is sleeved on one end of a door pull rod (1), and the U-shaped seat (21) is capable of axially rotating on a door pull cylinder (4); a cross joint (22) is embedded between the two ends of the upper part of the U-shaped seat (21), a shaft sleeve (23) is provided in the middle of the cross joint (22), and the shaft sleeve (23) is connected to the aircraft door connecting shaft; the door pull rod (1) extends out of the bottom of the U-shaped seat (21) and is fixedly connected to the U-shaped seat (1) via a fastener (5).

3. A door pull rod mechanism according to claim 2, characterized in that: A joint bearing (211) is arranged at the lower part of the U-shaped seat (21), and a joint shaft (11) matching the joint bearing is arranged at one end of the door pull rod (1). The door connector (2) and the door pull rod (1) are connected to the joint shaft (11) at the end of the door pull rod (1) through the joint bearing (211) at the lower part of the U-shaped seat (21). A bearing ring (212) for clamping the joint shaft (11) is also arranged in the joint bearing (211). A steel wire (213) for tightening the bearing ring (212) is also arranged in the U-shaped seat (21). Two ends of the steel wire (213) extend from one side of the lower part of the U-shaped seat (21). The steel wire (213) tightens the bearing ring (212) so that the joint bearing (211) and the joint shaft (11) are fixed, thereby fixing the door connector (2) and the door pull rod (1).

4. A door pull rod mechanism according to claim 3, characterized in that: A blocking cover (214) for sealing the joint bearing (211) and the joint shaft (11) is also provided at the bottom of the U-shaped seat (21).

5. A door pull rod mechanism according to claim 4, characterized in that: The cross joint (22) comprises an outer tube (221), both ends of the outer tube (221) are respectively embedded with bushings (222), a pin shaft (223) is embedded in the bushing (222), the pin shaft (233) passes through the upper part of the U-shaped seat (21) and is inserted in the bushing (222), so as to fix the outer tube (221) to the upper part of the U-shaped seat (21), the free end of the pin shaft (223) is also threadedly connected with an oiling nozzle (224), an oiling cavity connected to the oiling nozzle (224) is provided in the pin shaft (223), and a plurality of oiling holes connected to the internal oiling cavity are also provided on the side wall of the pin shaft (223), and fixing parts (5) passing through the pin shaft (223) are also provided on both sides of the outer tube (221), and the pin shaft (223) is fixed to the outer tube (221) through the fixing parts.

6. A door pull rod mechanism according to claim 5, characterized in that: The shaft sleeve (23) is embedded in the middle of the outer cylinder (221), and an oil injection nozzle (224) is provided in the middle of the outer side of the outer cylinder (221), and the oil injection hole of the oil injection nozzle (224) is in contact with the shaft sleeve (23).

7. A door pull rod mechanism according to claim 6, characterized in that: The door pull rod (1) comprises a rod body (12) in the middle, telescopic rods (13) are embedded at both ends of the rod body (12), and the telescopic rods (13) are fixed to the rod body (12) through locking nuts (14); a joint shaft (11) is installed on one end of the telescopic rod (13), and the joint shaft (11) is connected to the door connector (2); an earring bolt (15) is installed on the other end of the telescopic rod (13), and a radial spherical bearing (16) is installed inside the earring bolt (15), and the radial spherical bearing (16) is hinged to the pull rod joint (3); a fixing piece (5) penetrating the radial spherical bearing (16) is provided on one side of the pull rod joint (3), and the radial spherical bearing (16) is fixed to the cylinder joint (3) through the fixing piece (5).

8. A door pull rod mechanism according to claim 7, characterized in that: The tail support connecting member (4) comprises a connecting seat (41), the connecting seat (41) is L-shaped, one side of the connecting seat (41) is axially connected to the tie rod joint (3), one end of the tie rod joint (3) extending out of the connecting seat (41) is provided with a fixing member (5), and the other side is symmetrically provided with a connecting ear piece (42), and the symmetrically provided connecting ear pieces (42) are provided with a plurality of connecting holes (43), the connecting holes (42) are connected to the tail support of the aircraft, and each pair of connecting holes (42) is provided with a fixing member (5) penetrating the tail support of the aircraft to realize the fixed connection between the connecting holes (42) and the tail support of the aircraft.

9. A door pull rod mechanism according to any one of claims 2 to 8, characterized in that: The fixing member (5) comprises a bolt (51) and a hexagonal slot nut (52) matching the bolt (51), and a split pin (53) is installed on the hexagonal slot nut (52).

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