Helicopter sliding cabin door movement device and sliding cabin door

Abstract

The invention discloses a helicopter sliding cabin door movement device and a sliding cabin door. The helicopter sliding cabin door movement device comprises an upper sliding rail arranged on a cabin framework, a lower sliding rail arranged on a cabin floor and a middle sliding rail arranged on a main reduction platform. The upper sliding rail is connected with the sliding cabin door through an upper pulley assembly, the lower sliding rail is connected with the sliding cabin door through a lower pulley assembly, and the middle sliding rail is connected with the sliding cabin door through a middle pulley assembly. An opening used for installing the middle pulley assembly on the middle sliding rail faces outwards, the middle sliding rail is shorter than the upper sliding rail and the lower sliding rail, and the front end of the middle sliding rail is not bent inwards. An opening, used for installing the upper pulley assembly, of the upper sliding rail faces downwards, and the upper pulley assembly can move up and down in the upper sliding rail in a small range. The middle pulley assembly comprises a Z-direction rotating pulley block, a rocker arm assembly and a fixed steering connector, one end of the rocker arm assembly is hinged to the fixed steering connector, the other end of the rocker arm assembly is hinged to the Z-direction rotating pulley block, and the functions of smooth sliding and quick opening of the sliding cabin door on a machine can be achieved.

Description

Technical Field

[0001] The invention belongs to the field of helicopter structure design, and in particular relates to a helicopter sliding door movement device and a sliding door. Background Art

[0002] In most helicopter sliding door movement devices, the movement tracks of the pulley assemblies on the slide rails are arranged in parallel, the pulley assemblies on each slide rail have the same structure, the slide rails are long and have curved tracks, the movement tracks of the slide rails are the same, and the design is relatively simple.

[0003] For small civil helicopters, the angles between the cockpit floor and the main reduction platform are different, and the space size of the main reduction platform is limited, so it is necessary to use a slide rail with a short length and no curved track on the main reduction platform. The slide rails on the cockpit floor and the main reduction platform are designed at different angles, so the sliding door motion device cannot be designed in the above-mentioned parallel setting manner, otherwise it is easy to cause uncoordinated movement between the pulley assemblies and movement jamming.

[0004] Therefore, it is necessary to provide a sliding door movement device to ensure coordinated movement between the pulley assemblies, prevent movement jamming, and ensure smooth movement of the sliding door. Summary of the invention

[0005] The present invention provides a helicopter sliding door movement device and a sliding door, which are used to solve the problems of different movement trajectories of various slide rails, especially the problem of movement stagnation caused by the short length of the slide rails and the inability to set a curved trajectory. The technical solution is as follows:

[0006] In a first aspect, a helicopter sliding door movement device is provided, comprising an upper slide rail arranged on a cabin frame, a lower slide rail arranged on a cabin floor, and a middle slide rail arranged on a main reduction platform;

[0007] The upper slide rail is connected to the sliding door via an upper pulley assembly, the lower slide rail is connected to the sliding door via a lower pulley assembly, and the middle slide rail is connected to the sliding door via a middle pulley assembly;

[0008] The opening on the middle slide rail for installing the middle pulley assembly faces outward, the middle slide rail is shorter than the upper slide rail and the lower slide rail, and the front end of the middle slide rail has no inner bend;

[0009] The opening on the upper slide rail for installing the upper pulley assembly faces downward, and the upper pulley assembly can move up and down in a small range in the upper slide rail;

[0010] The middle pulley assembly includes a Z-direction rotating pulley set, a rocker arm assembly, and a fixed steering joint. Among them, the Z-direction rotating pulley set has the same structure as the Z-direction rotating pulley set of the lower pulley assembly; one end of the rocker arm assembly is hinged to the fixed steering joint, and the other end is hinged to the Z-direction rotating pulley set; one end of the rocker arm assembly can rotate around the fixed steering joint, and the other end can rotate around the Z-direction rotating pulley set.

[0011] Optionally, the front end of the upper slide rail first bends inward into the cabin and then is set as a straight section, so that the upper part of the sliding cabin door slides along the upper slide rail inward into the cabin by a preset distance through the upper pulley assembly and is fixed on the straight section, restricting the lateral movement of the sliding cabin door.

[0012] Optionally, the upper pulley assembly includes: a transverse wheel, a fixing member such as a bolt, a laterally adjustable bracket, and a cabin door fixed elbow bracket; the transverse wheel is fixed to the laterally adjustable bracket and the cabin door fixed elbow bracket through the fixing member, and the cabin door fixed elbow bracket is connected to the sliding cabin door; a toothed array structure is provided on the lower mounting surface of the laterally adjustable bracket, which cooperates with the toothed array structure on the cabin door fixed elbow bracket to adjust the lateral position of the upper pulley assembly; the clearance between the outer diameter of the transverse wheel and the upper slide rail is a preset clearance to ensure smooth sliding of the upper pulley assembly on the upper slide rail; the tolerance of the plain shaft area of the fixing member is f9, and it has an interference fit with the rolling bearing of the transverse wheel.

[0013] Optionally, the transverse wheel includes: a rolling bearing and a lubricating bushing. The lubricating bushing is made of reinforced nylon and is injection molded into the bushing groove on the outer ring of the rolling bearing through an injection molding process.

[0014] Optionally, the opening on the lower slide rail for installing the lower pulley assembly faces outward, and the front end of the lower slide rail bends inward into the cabin, so that the lower part of the sliding cabin door slides obliquely inward into the cabin by a preset distance along the lower slide rail through the lower pulley assembly, and there is no straight section at the front end of the lower slide rail.

[0015] Optionally, the lower pulley assembly includes: a Z-direction rotating pulley set and a toothed double-ear joint.

[0016] Among them, the Z-direction rotating pulley set is hinged to a toothed double-ear joint, and the toothed double-ear joint is fixedly connected to the sliding cabin door. The Z-direction rotating pulley set of the lower pulley assembly has the same structure as the Z-direction rotating pulley set of the middle pulley assembly.

[0017] Optionally, the Z-direction rotating pulley set includes: a rotatable bogie, two transverse wheels, and one vertical wheel.

[0018] Among them, two transverse wheels are symmetrically arranged at both ends of the vertical wheel; each transverse wheel and the vertical wheel are inserted into the rotatable bogie through the mounting shaft, and the fit tolerance between the mounting shaft and the mounting hole of the rotatable bogie is H8 / f9. The rotatable bogie and the mounting shaft are fixed by a pin, and the fit tolerance between the rotatable bogie and the mounting pin is H10 / f9; a first boss is provided at the connection between the rotatable bogie and the toothed double-ear joint, and the gap between the double-ear joints on the toothed double-ear joint is greater than the height of the first boss; the transverse wheels and the vertical wheels have the same structure as the transverse wheels of the upper pulley assembly.

[0019] Optionally, a rocker arm limiting device with adjustable length is provided at the upper end of the front part of the middle slide rail for restricting the inward rotation of the rocker arm assembly when the sliding hatch is closed.

[0020] The rocker arm limiting device includes: a limiting support and a bolt. Among them, a second boss is provided at the front end of the limiting support, and a through hole with internal threads is provided in the middle of the second boss; the head of the bolt is a third boss, and flat surfaces are provided at both ends of the third boss for rotation during the installation of the bolt. The bolt can adjust its own front and rear positions by rotating on the limiting support.

[0021] Optionally, the rocker arm assembly includes: a rocker arm, a first spring joint, a second spring joint, and a spring;

[0022] Among them, the rocker arm is provided with 3 double-ear joints. The first double-ear joint is used to connect the Z-direction rotating pulley group, the second double-ear joint is used to connect the first spring joint; the third double-ear joint is used to connect the fixed steering joint;

[0023] One end of the first spring joint is a double-ear joint, and the other end is a cylindrical shaft. The center of the double-ear joint hole and the center of the cylindrical shaft are on the same symmetry plane. A cylindrical hole for the telescopic movement of the second spring joint is provided on the cylindrical shaft;

[0024] One end of the second spring joint is a double-ear joint, and the other end is a cylindrical shaft. The center of the hole on the double-ear joint and the center of the cylindrical shaft are on the same symmetry plane. The spring is sleeved outside the cylindrical shaft of the first spring joint, and the second spring joint is inserted into the cylindrical hole of the first spring joint;

[0025] The fixed steering joint includes: an upper ear piece, a middle ear piece, and a lower ear piece. The three ear pieces are parallel to the installation surface of the middle slide rail, and all three ear pieces are provided with coaxial through holes for connecting the third double-ear joint of the rocker arm through a pin shaft,

[0026] The middle ear piece is provided with a through hole for connecting the second spring joint, and the connection line between the center of the circular hole of this through hole and the center of the hole on the second double-ear joint of the rocker arm is outside the center of the hole of the first double-ear joint of the rocker arm.

[0027] In a second aspect, a sliding hatch is provided, including the helicopter sliding hatch movement device according to any one of the first aspects.

[0028] The beneficial effects of the present invention are at least:

[0029] The motion device of the present invention has an opening on the middle slide rail for installing the middle pulley assembly facing outward, the length of the middle slide rail is shorter than the upper slide rail and the lower slide rail, and the front end of the middle slide rail has no inner bend; the middle pulley assembly includes a Z-axis rotating pulley group, a rocker arm assembly and a fixed steering joint, and the Z-axis rotating pulley group has the same structure as the Z-axis rotating pulley group of the lower pulley assembly; one end of the rocker arm assembly is hinged to the fixed steering joint, and the other end is hinged to the Z-axis rotating pulley group; one end of the rocker arm assembly can rotate around the fixed steering joint, and the other end can rotate around the Z-axis rotating pulley group; it can be realized that the slide rail with a short length and no curved track can be used on the main reduction platform; because the opening on the upper slide rail for installing the upper pulley assembly faces downward, the upper pulley assembly can move up and down in a small range in the upper slide rail, so different design angles of the slide rails on the cabin ground and the main reduction platform can be realized; finally, the pulley assemblies move in a coordinated manner, and it is not easy to have movement jamming phenomenon, thereby ensuring the smooth movement of the sliding cabin door. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a helicopter sliding door movement device and the overall structure of the sliding door of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the rocker arm limiting device at the front of the middle slide rail;

[0032] Figure 3 is a structural schematic diagram of an upper pulley assembly;

[0033] Figure 4 is a schematic diagram of the structure of the transverse wheel;

[0034] Figure 5 It is a structural schematic diagram of the lower pulley assembly;

[0035] Figure 6 It is a schematic diagram of the installation structure of the transverse wheel and the vertical wheel and the rotatable bogie;

[0036] Figure 7 It is a schematic diagram of the structure of the middle pulley assembly;

[0037] Figure 8 It is a schematic diagram of the rocker arm structure in the middle pulley assembly;

[0038] Figure 9 It is a schematic diagram of the dimensions of the rocker arm double ear joint in the middle pulley assembly;

[0039] Figure 10 It is a schematic diagram of the fixed steering joint structure in the middle pulley assembly.

[0040] Among them, 1 - sliding hatch door, 2 - upper slide rail, 3 - upper pulley assembly, 4 - lower slide rail, 5 - lower pulley assembly, 6 - middle slide rail, 7 - middle pulley assembly, 8 - limit support, 9 - first bolt, 10 - lateral wheel, 11 - second bolt, 12 - laterally adjustable bracket, 13 - hatch door fixed elbow bracket, 14 - rolling bearing, 15 - embedded bushing, 16 - rotatable bogie, 17 - lateral wheel, 18 - vertical wheel, 19 - toothed double-ear joint, 20 - mounting shaft, 21 - pin, 22 - fixed steering joint, 23 - rocker arm, 24 - first spring compression joint, 25 - second spring compression joint, 26 - compression spring, 27 - first double-ear joint, 28 - second double-ear joint, 29 - third double-ear joint, 30 - limit boss, 31 - upper ear piece, 32 - middle ear piece, 33 - lower ear piece. Detailed implementation manners

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] The features and illustrative embodiments of all aspects of the present invention will be described in detail below. In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those of ordinary skill in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by showing examples of the present invention. The present invention is in no way limited to any specific arrangement and method set forth below, but covers any improvement, replacement, and modification of structures, methods, and devices without departing from the spirit of the present invention. Well-known structures and technologies are not shown in the drawings and the following description to avoid unnecessarily obscuring the present invention. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other, and the various embodiments may be referred to and cited with each other.

[0043] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation manners.

[0044] A helicopter sliding cabin door movement device provided by an embodiment of the present invention includes three slide rails with different movement trajectories and their corresponding pulley assemblies that are connected to the sliding cabin door and arranged on the helicopter airframe structure; the three slide rail assemblies are respectively arranged on the cabin skeleton, the cabin floor, and the main reduction platform. The three slide rails are arranged vertically, with the upper and lower slide rails having basically the same heading position, and the front ends of the upper and lower slide rails are bent inward into the cabin, causing the cabin door to move inward during the sliding process. Due to space size limitations on the main reduction platform, the sliding distance of the middle slide rail is less than that of the upper and lower slide rails, and the front end of the slide rail cannot be bent inward into the cabin. The three groups of pulley assemblies include an upper pulley assembly, a lower pulley assembly, and a middle pulley assembly. The upper pulley assembly is only provided with fixed transverse wheels. The lower pulley assembly is provided with a Z-direction rotating pulley group and a toothed double-ear joint. The pulley group that can rotate around the Z direction includes a rotatable bogie, two transverse wheels, and a vertical wheel. The middle pulley assembly includes a Z-direction rotating pulley group, a rocker arm assembly, and a fixed steering joint. When the sliding cabin door is opened, through the bending guidance of the upper and lower slide rails and the rotation of the rocker arm of the middle pulley assembly, the sliding cabin door slides backward in coordination. The present invention solves the problems of using a slide rail with a short length and no bending trajectory on the main reduction platform, and different design angles of the slide rails on the cabin floor and the main reduction platform, resulting in uncoordinated movement and jamming between the pulley assemblies. Through on-aircraft installation tests of the cabin door mechanism, the results show that the smooth sliding and quick opening functions of the sliding cabin door on the aircraft can be achieved.

[0045] An embodiment of the present invention provides a helicopter sliding cabin door movement device, including an upper slide rail 2 arranged on the cabin skeleton, a lower slide rail 4 arranged on the cabin floor, and a middle slide rail 6 arranged on the main reduction platform. Please refer to Figure 1 ;

[0046] Furthermore, the front end of the upper slide rail is first bent inward into the cabin and then a straight section is provided, causing the upper part of the sliding cabin door 1 to slide inward into the cabin by 110 mm first and then be fixed on the straight section, restricting the lateral movement of the cabin door. The opening on the upper slide rail for installing the upper pulley assembly 3 faces downward, and the upper pulley assembly 3 can move slightly up and down within the upper slide rail. The front end of the lower slide rail is bent inward into the cabin, causing the lower part of the sliding cabin door 1 to slide obliquely inward into the cabin by 110 mm, and there is no straight section at the front end of the slide rail. The opening on the middle slide rail 6 for installing the middle pulley assembly faces outward, with a length 100 mm shorter than that of the upper slide rail 2 and the lower slide rail 4, and the front end of the middle slide rail 6 cannot be bent inward due to the space limitation of the fuselage;

[0047] Further, at the upper end of the front part of the middle slide rail 6, there is a rocker arm limiting device with adjustable length for restricting the inward rotation of the rocker arm assembly when the sliding hatch door is closed. The limiting device includes a limiting support 8 and a first bolt 9. At the front end of the limiting support 8, there is a second boss with a thickness of 6 mm, and a through hole with an M6 internal thread is provided in the middle of the second boss. The total length of the cylindrical shaft of the first bolt 9 is 30 mm, the length with M6 thread is 25 mm, the bolt head is a third boss with a diameter of Φ14 mm and a thickness of 5 mm, and flat surfaces are provided at both ends of the boss for rotation during bolt installation. The bolt can be adjusted in the front-back position by rotation on the limiting support. Please refer to Figure 2 。

[0048] The upper slide rail 2 is connected to the sliding hatch door 1 through the upper pulley assembly 3, the lower slide rail 4 is connected to the sliding hatch door 1 through the lower pulley assembly 5, and the middle slide rail 6 is connected to the sliding hatch door 1 through the middle pulley assembly 7. Please refer to Figure 1 ;

[0049] Further, the upper pulley assembly includes: a transverse wheel 10, a second bolt 11, a laterally adjustable bracket 12, and a hatch door fixed elbow bracket 13. Please refer to Figure 3 。The clearance between the outer diameter of the transverse wheel 10 and the slide rail is 0.5 mm. The transverse wheel 10 includes a rolling bearing 14 and an embedded bushing 15. The material of the embedded bushing 15 is reinforced nylon. A groove with a width of 2 mm and a depth of 1 mm is opened around the rolling bearing 14 for injection molding of reinforced nylon. Please refer to Figure 4 。The tolerance of the smooth rod area of the bolt is f9, and it has an interference fit with the rolling bearing. The lower mounting surface of the laterally adjustable bracket is provided with a tooth array, which cooperates with the tooth array on the hatch door fixed elbow bracket to adjust the lateral position of the upper pulley assembly. Each tooth can be adjusted by 1 mm.

[0050] Further, the lower pulley assembly includes: a Z-direction rotating pulley group and a toothed double-ear joint 19. The Z-direction rotating pulley group includes: a rotatable bogie 16, two transverse wheels 17, and a vertical wheel 18. The clearance between the transverse wheels 17 and the vertical wheel 18 and the lower slide rail is 0.5 mm. The transverse wheels 17 and the vertical wheel 18 have the same structure as the transverse wheel of the upper pulley assembly. The two transverse wheels are symmetrically arranged at both ends of the vertical wheel, and the axial distance between the two transverse wheels is 50 mm. A first boss is provided at the connection between the rotatable bogie 16 and the toothed double-ear joint 19, and the height of the boss is 10 mm. The clearance between the double-ear joints on the toothed double-ear joint 19 is greater than the height of the first boss, and the clearance between the double-ear joints is 11 mm. Please refer to Figure 5 。

[0051] Further, the horizontal wheel 17 and the vertical wheel 18 are inserted into the bogie through shafts. The diameter of the mounting shaft 20 of the horizontal wheel is Φ6mm, and the diameter of the mounting shaft 20 of the vertical wheel is Φ8mm. The fit tolerance between the shaft and the mounting hole of the bogie is H8 / f9. The bogie and the shaft are fixed by a pin 21. The fit tolerance between the bogie and the pin is H10 / f9, and the diameter of the pin is Φ2mm. Please refer to Figure 6 .

[0052] The middle pulley assembly includes: 1 Z-direction rotating pulley group, a rocker arm assembly, and a fixed steering joint 22. Among them, the structure of the Z-direction rotating pulley group of the middle pulley assembly is the same as that of the Z-direction rotating pulley group of the lower pulley assembly; one end of the rocker arm assembly is hinged to the fixed steering joint, and the other end is hinged to the Z-direction rotating pulley group; one end of the rocker arm assembly can rotate around the fixed steering joint 22, and the other end can rotate around the Z-direction rotating pulley group. Please refer to Figure 7 .

[0053] Further, the rocker arm assembly includes: a rocker arm 23, a first spring pressing joint 24, a second spring pressing joint 25, and a spring 26. The spring 26 is sleeved outside the cylindrical shaft of the first spring pressing joint 24, and the second spring pressing joint 25 is inserted into the cylindrical hole of the first spring pressing joint 24. Please refer to Figure 7 .

[0054] Further, at the front end of the rocker arm, there is a first double-ear joint 27 with a gap of 11mm, which is used to connect the Z-direction rotating pulley group. The thickness of the ear piece is 4mm. The center of the hole on the first double-ear joint 27 is 8mm away from the rear end of the rocker arm and 10mm away from the side end of the rocker arm; at the front end of the rocker arm, there is also a limit boss 30 parallel to the end of the double-ear joint. The local height of the limit boss 30 is 4mm higher than that of the double-ear joint, and the width is 15mm; at a distance of 56mm from the rear end of the rocker arm, there is a second double-ear joint 28 for connecting the first spring pressing joint. The thickness of the ear piece is 2mm, and the gap between the double-ear joints is 14mm. The center of the hole on the second double-ear joint 28 is 20mm away from the side end of the rocker arm. At a distance of 130mm from the rear end of the rocker arm, there is a third double-ear joint 29 for connecting to the fuselage joint. The thickness of the ear piece is 4mm, and the gap is 26mm. The center of the hole on the third double-ear joint 29 is 37mm away from the side end of the rocker arm. Please refer to Figure 8 and Figure 9 .

[0055] Further, one end of the first spring pressing joint is a double-ear joint, and the other end is a cylindrical shaft. The gap between the double-ear joints is 8mm, the thickness of the ear piece is 2mm. The center of the connecting hole on the double-ear joint is 48mm from the end of the cylindrical shaft. The center of the hole and the center of the cylindrical shaft are on the same symmetry plane. The length of the cylindrical shaft is 40mm. From the end of the cylindrical shaft, there is a cylindrical hole with a length of 20mm and a diameter of Φ6H8 for the telescopic movement of the second spring pressing joint.

[0056] Furthermore, for the second compression spring joint, one end is a double-ear joint and the other end is a cylindrical shaft. The gap between the double-ear joints is 6 mm, the thickness of the ear piece is 2 mm, the distance from the center of the connecting hole on the double-ear joint to the end of the cylindrical shaft is 29.5 mm, the center of the hole and the center of the cylindrical shaft are in the same symmetry plane, the length of the cylindrical shaft is 20 mm, and the diameter of the cylindrical shaft is Φ6h7.

[0057] Furthermore, the material of the compression spring is selected as music wire G1 group, the wire diameter is 2.6 mm, the outer diameter of the spring is 14 mm, the number of effective turns is 12.5 turns, and the free height is 54 mm. When the first compression spring joint moves to the limit position during the telescopic movement, the distance between the compression spring pressing surface on the first compression spring joint and the compression spring pressing surface on the second compression spring joint is 41 mm, and at this time the compression spring is compressed by 13 mm.

[0058] According to the stiffness of the compression spring , where G is the elastic modulus of the music wire, which is 70000 MPa, d is the diameter of the music wire, which is 2.6 mm. N is the number of finite turns, which is 12.5 turns. D is the mean diameter of the compression spring, which is the outer diameter minus the wire radius, that is 14 - 1.3 = 12.7 mm. According to the formula calculation, k = 17.6 N / mm.

[0059] According to the compression spring force calculation formula F = kx, where k is the stiffness of the compression spring and x is the compression distance. It can be known that when the first compression spring joint and the second compression spring joint are compressed to the limit position, F = 17.6 N / mm × 13 mm = 228.8 N, which is between the left and right pushing forces of the human hand, 187 N to 231 N, specified in GJB2873. The pressure value generated by the compression spring is reasonably designed, and it can simultaneously achieve that the compression spring can generate corresponding damping when the sliding hatch is closed and the resistance generated by the compression spring can be overcome by hand pushing.

[0060] Furthermore, the fixed swivel joint includes: upper ear piece 31, middle ear piece 32, and lower ear piece 33. The three ear pieces are parallel to the middle slide rail mounting surface. Among them, the gap between the upper and lower ear pieces is 34 mm, and the tolerance is -0.15 to 0. The thickness of the upper and lower ear pieces is 4 mm, the thickness of the middle ear piece is 6 mm, and the tolerance is -0.15 to 0. The lower surface of the middle ear piece is 20 mm away from the upper surface of the lower ear piece. Through holes of Φ8H8 are drilled simultaneously on the three ear pieces for connecting the third double-ear joint of the rocker arm through a pin shaft. The diameter of the connecting pin shaft is 6 mm. A through hole of Φ5H8 is separately opened on the middle ear piece for connecting the second compression spring joint. The connection line between the center of the Φ5 round hole on the middle ear piece and the center of the hole on the second double-ear joint of the rocker arm is outside the center of the hole of the first double-ear joint of the rocker arm. Please refer to Figure 10 .

[0061] The above only expresses the embodiments of the present invention, which are described in a relatively specific and detailed manner, but should not be construed as a limitation on the scope of the patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention. In addition, the parts not elaborated in the present invention are all conventional techniques.

Claims

1. A helicopter sliding door movement device, characterized in that, It includes an upper sliding rail arranged on the cockpit frame, a lower sliding rail arranged on the cockpit floor, and a middle sliding rail arranged on the main reduction platform; The upper sliding rail is connected to the sliding cabin door through an upper pulley assembly, the lower sliding rail is connected to the sliding cabin door through a lower pulley assembly, and the middle sliding rail is connected to the sliding cabin door through a middle pulley assembly; The opening on the middle sliding rail for installing the middle pulley assembly faces outward. The length of the middle sliding rail is shorter than that of the upper sliding rail and the lower sliding rail, and there is no inner bend at the front end of the middle sliding rail; The opening on the upper sliding rail for installing the upper pulley assembly faces downward, and the upper pulley assembly can move slightly up and down within the upper sliding rail; The middle pulley assembly includes a Z-direction rotating pulley group, a rocker arm assembly, and a fixed steering joint. Among them, the Z-direction rotating pulley group has the same structure as the Z-direction rotating pulley group of the lower pulley assembly; one end of the rocker arm assembly is hinged to the fixed steering joint, and the other end is hinged to the Z-direction rotating pulley group; one end of the rocker arm assembly can rotate around the fixed steering joint, and the other end can rotate around the Z-direction rotating pulley group; The front end of the upper sliding rail first bends inward into the cabin and then is set as a straight section, so that the upper part of the sliding cabin door slides a preset distance inward along the upper sliding rail through the upper pulley assembly and is fixed on the straight section, restricting the lateral movement of the sliding cabin door; The opening on the lower sliding rail for installing the lower pulley assembly faces outward. The front end of the lower sliding rail bends inward into the cabin, so that the lower part of the sliding cabin door slides obliquely a preset distance inward along the lower sliding rail through the lower pulley assembly, and there is no straight section at the front end of the lower sliding rail; A rocker arm limiting device with adjustable length is arranged at the upper end of the front part of the middle sliding rail to limit the inward rotation of the rocker arm assembly when the sliding cabin door is closed.

2. The device according to claim 1, characterized in that, The upper pulley assembly includes: a lateral wheel, a fixing member, a laterally adjustable bracket, and a cabin door fixed elbow bracket; the lateral wheel is fixed on the laterally adjustable bracket and the cabin door fixed elbow bracket through the fixing member, and the cabin door fixed elbow bracket is connected to the sliding cabin door; a toothed array structure is arranged on the lower mounting surface of the laterally adjustable bracket, which cooperates with the toothed array structure on the cabin door fixed elbow bracket to adjust the lateral position of the upper pulley assembly; the clearance between the outer diameter of the lateral wheel and the upper sliding rail is a preset clearance to ensure smooth sliding of the upper pulley assembly on the upper sliding rail; the tolerance of the smooth rod area of the fixing member is f9, and it has an interference fit with the rolling bearing of the lateral wheel.

3. The device according to claim 2, characterized in that The lateral wheel includes: a rolling bearing and a lubricating bushing. The lubricating bushing is made of reinforced nylon and is injection molded into the bushing groove on the outer ring of the rolling bearing through an injection molding process.

4. The device according to claim 1, characterized in that, The lower pulley assembly includes: a Z-direction rotating pulley group and a toothed double-ear joint; Among them, the Z-direction rotating pulley group is hinged to the toothed double-ear joint, the toothed double-ear joint is fixedly connected to the sliding cabin door, and the Z-direction rotating pulley group of the lower pulley assembly has the same structure as the Z-direction rotating pulley group of the middle pulley assembly.

5. The device according to claim 4, characterized in that, The Z-direction rotating pulley group includes: a rotatable bogie, two lateral wheels, and a vertical wheel. Among them, two transverse wheels are symmetrically arranged at both ends of the vertical wheel; each transverse wheel and the vertical wheel are inserted into the rotatable bogie through the mounting shaft, and the fit tolerance between the mounting shaft and the mounting hole of the rotatable bogie is H8 / f9. The rotatable bogie and the mounting shaft are fixed by a pin, and the fit tolerance between the rotatable bogie and the mounting pin is H10 / f9; a first boss is provided at the connection between the rotatable bogie and the toothed double-ear joint, and the gap between the double-ear joints on the toothed double-ear joint is greater than the height of the first boss; the transverse wheels and the vertical wheels have the same structure as the transverse wheels of the upper pulley assembly.

6. The device according to claim 1, characterized in that, The rocker arm limiting device includes: a limiting support and a bolt. Among them, a second boss is provided at the front end of the limiting support, and a through hole with internal threads is provided in the middle of the second boss; the head of the bolt is a third boss, and flat surfaces are provided at both ends of the third boss for rotation during the installation of the bolt. The bolt can adjust its own front and rear positions by rotating on the limiting support.

7. The device according to claim 1, characterized in that, The rocker arm assembly includes: a rocker arm, a first spring pressing joint, a second spring pressing joint, and a spring; Among them, the rocker arm is provided with 3 double-ear joints. The first double-ear joint is used to connect the Z-direction rotating pulley group, the second double-ear joint is used to connect the first spring pressing joint; the third double-ear joint is used to connect the fixed steering joint; One end of the first spring pressing joint is a double-ear joint, and the other end is a cylindrical shaft. The center of the double-ear joint hole and the center of the cylindrical shaft are on the same symmetry plane. A cylindrical hole for the telescopic movement of the second spring pressing joint is provided on the cylindrical shaft; One end of the second spring pressing joint is a double-ear joint, and the other end is a cylindrical shaft. The center of the hole on the double-ear joint and the center of the cylindrical shaft are on the same symmetry plane. The spring is sleeved outside the cylindrical shaft of the first spring pressing joint, and the second spring pressing joint is inserted into the cylindrical hole of the first spring pressing joint; The fixed steering joint includes: an upper ear piece, a middle ear piece, and a lower ear piece. The three ear pieces are parallel to the middle slide rail mounting surface, and all three ear pieces are provided with coaxial through holes for connecting the third double-ear joint of the rocker arm through a pin shaft, The middle ear piece is provided with a through hole for connecting the second spring pressing joint, and the connection line between the center of the circular hole of this through hole and the center of the hole on the second double-ear joint of the rocker arm is outside the center of the hole on the first double-ear joint of the rocker arm.

8. A sliding hatch door, characterized in that, It includes the helicopter sliding hatch movement device according to any one of claims 1 to 7.

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