An automatic folding sliding door structure and folding method

Abstract

This invention belongs to the field of structural design technology, specifically relating to an automatic folding sliding door structure and folding method. It includes a large sliding door (10), a small sliding door (20), a large door slide rail assembly (50), a small door slide rail assembly (60), an automatic folding mechanism (70), and a limiting device (80). The automatic folding sliding door structure of this invention enables the small sliding door (20) to automatically fold and lock within the large sliding door (10). When opening, when the large sliding door (10) slides to the limiting device (80), the small sliding door (20) is stopped from sliding by the combined action of the automatic folding mechanism (70) and the limiting device (80), while the large sliding door (10) continues to slide until it is fully open. When closing, when the large sliding door (10) slides to the limiting device (80), it is unlocked and slides together with the small sliding door (20) until it is fully closed.

Description

Technical Field

[0001] This invention belongs to the field of structural design technology, specifically relating to an automatic folding sliding door structure and folding method. Background Technology

[0002] To achieve greater fuselage capacity and lower cabin ground clearance, transport helicopters often employ large external stub wing fuel tanks. Additionally, when weapon pylons and equipment are added, protruding structures are often installed on the external fuselage surface. Transport helicopters typically have sliding doors that open along the fuselage surface, but the presence of the stub wing and protruding structures limits the sliding door's sliding distance, thus affecting its opening. Currently, the main solutions are either creating notches at the root of the stub wing to accommodate the opened door, or reducing the width of the sliding door. However, this affects the stub wing structure and its volume, or prevents the use of large sliding doors.

[0003] Therefore, there is a desire for a sliding door structure that can both avoid or not affect protruding structures on the stub wing or fuselage surface, and also allow for a large-sized sliding door design. Summary of the Invention

[0004] In view of the above-mentioned situation of the prior art, the purpose of the present invention is to provide an automatic folding sliding door structure, which adopts a design of a large sliding door with a small sliding door. The large sliding door adopts a large width design, and a notch and a small sliding door that can be automatically folded are arranged at the rear end of the large sliding door. When the large sliding door slides open and the small sliding door automatically folds, the notch of the large sliding door can avoid protruding structures such as short wings on the fuselage surface.

[0005] The above-mentioned objective of this invention is achieved by the following technical solution:

[0006] An automatic folding sliding door structure includes a large sliding door, a small sliding door, a large door track assembly, a small door track assembly, an automatic folding mechanism, and a limiting device. The large door track assembly is installed on the surface of the main body structure. The large sliding door is installed in the large door track assembly via a large pulley group. A notch is opened at the lower rear end of the large sliding door, and a small door track assembly is installed at the notch. The small sliding door is installed in the small door track assembly via a small pulley group. The automatic folding mechanism and the limiting device are respectively installed on the small sliding door, the large sliding door, and the main body structure. The small sliding door is locked and unlocked by the automatic folding mechanism and the limiting device. In the closed state, the small sliding door is locked at the rear end of the large sliding door to block the notch at the lower rear end of the large sliding door.

[0007] The shape of the notch on the large sliding door matches the shape of the front end of the short wing, ensuring that the notch can completely avoid the short wing after it is slid open.

[0008] The large sliding door is rectangular with a notch. Large pulley sets are arranged at its four corners and the top of the notch. These large pulley sets are connected to the door track assembly. The five large pulley sets ensure the rigidity of the large sliding door.

[0009] The door sliding rail assembly consists of four rails, which are installed on the body structure and located at the top, bottom, middle rear, and bottom rear of the large sliding door. The middle rear and bottom rear rails cross the upper and lower surfaces of the short wing, respectively. All four rails are curved at the front end.

[0010] The large sliding door shares an upper slide rail with its front and rear upper pulley groups. The large sliding door is connected to the rear upper pulley group by a swing arm. The swing arm moves with the large sliding door when it is opened to accommodate the turning section when the large sliding door is open.

[0011] The design of the large sliding door with five large pulley groups, swing arms and four slide rails ensures the connection rigidity of the large sliding door, while avoiding poor sliding smoothness caused by too many constraints due to too many large pulley groups.

[0012] The small door sliding rail assembly consists of three rails, which are installed on the large sliding door and located at the top, bottom, and front of the large sliding door opening, respectively. All small door sliding rails are straight rails.

[0013] The automatic folding mechanism and limiting device are installed on the small sliding door, the large sliding door, and the body structure, respectively, and mainly include locking hooks, locking pins, torsion springs, limiting pins, and limiting seats.

[0014] The locking hook is installed on the small sliding door, and a locking pin and a torsion spring are installed on it. The locking hook can rotate around the axis, and the torsion spring force causes the locking hook to rotate upward. The rear end is limited by a structure that can only rotate upward to the horizontal position.

[0015] The limiting post is installed on the large sliding door and has a front and rear cylindrical structure. One cylindrical surface is used for locking the limiting hook, and the other cylindrical surface is used for impacting the inclined front end of the locking hook.

[0016] The limiting seat is installed on the machine body structure, and it is provided with a ramp surface and a limiting groove. A rubber pad is installed at the front end of the limiting groove, and the rear end of the limiting groove is the limiting groove ramp surface.

[0017] The automatic folding mechanism and limiting device are used to automatically separate and connect the large sliding door and the small sliding door during the opening and closing process of the sliding door, as well as to lock and limit the small sliding door.

[0018] When the large sliding door is fully closed, the locking hook engages with the limiting post to lock the small sliding door; when the large sliding door is fully open, the limiting groove of the limiting seat engages with the locking post to maintain the limiting position of the small sliding door.

[0019] The working principle of the automatic folding mechanism and the limiting device is as follows:

[0020] Working principle of the door opening: When the large sliding door slides with the small sliding door to the position of the limit device, the locking pin on the lock hook hits the limit seat, causing the lock hook to automatically disengage from the limit pin first. Then the locking pin enters the limit seat and automatically stops. That is, the large sliding door and the small sliding door separate first, and then the small door automatically stops, while the large sliding door can continue to slide until it is fully open.

[0021] Working principle of closing the door: When the large sliding door slides to the position of the limit device, the limit post hits the lock hook, forcing the lock post to first disengage from the limit seat. Then the lock hook automatically hooks the limit post and locks the small sliding door. That is, the large sliding door and the small sliding door first combine into one, and then the large sliding door slides together with the small sliding door until it is completely closed.

[0022] The beneficial effects of the present invention are as follows: The design of an automatic folding sliding door structure can avoid the protruding structures on the short wings or fuselage surface, and can also adopt a large-size sliding door design. The automatic folding mechanism can realize the automatic separation, combination and locking of the small sliding door in the large sliding door, and make the opening and closing operation of the sliding door simple and without any extra operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the closed state of the automatic folding sliding door structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the open state of the automatic folding sliding door structure of the present invention.

[0025] Figure 3 This is a schematic diagram of the automatic folding mechanism and limiting device of the present invention.

[0026] Figure 4 This is a schematic diagram illustrating the working principle of the automatic folding mechanism and limiting device of the present invention during the door opening and closing process. Detailed Implementation

[0027] To better understand the purpose, technical solution, and advantages of this invention, the invention will be further described in detail below with reference to the accompanying drawings and examples.

[0028] Figure 1 and Figure 2 These are schematic diagrams showing the closed and open states of the automatic folding sliding door structure of the present invention. As shown in the figures, in the automatic folding sliding door structure of the present invention, the fuselage structure 30 has a protruding short wing structure 40, which is relatively large and close to the rear end of the large sliding door 10. When the sliding door is opened, it must avoid the short wing 40; otherwise, the opening size will be limited. To address this, a notch is provided at the rear end of the large sliding door 10. The shape of the notch is similar to that of the short wing 40, but its size is slightly larger than that of the short wing 40, allowing the large sliding door 10 to avoid the short wing when it is opened.

[0029] A small sliding door 20 is provided at the notch of the large sliding door 10, such as... Figure 1 As shown, when the large sliding door 10 is closed, the small sliding door 20 locks in its notch position, forming a complete seal. Figure 2 As shown, when the large sliding door 10 is opened, the small sliding door 20 slides to the front of the large sliding door 10, thus avoiding the short wing 40.

[0030] The door sliding rail assembly 50 is mounted on the body structure 30. The large sliding door 10 slides within the door sliding rail assembly 50 via five large pulley groups 110. The five large pulley groups 110 are located at the four corners and the upper end of the notch of the large sliding door 10 to ensure the connection rigidity of the large sliding door. To reduce the constraint on the large sliding door, the door sliding rail assembly 50 uses four rails. The large pulley group 110 at the upper rear end of the large sliding door 10 is connected to the rails via a swing arm 100. All four rails of the door sliding rail assembly 50 are curved rails. When the large sliding door 10 opens and slides, the swing arm 100 rotates at the curved section.

[0031] The small door sliding assembly 60 is installed on the large sliding door 10. It has three sliding rails, all of which are straight rails. The small sliding door 20 slides in the small door sliding assembly 60 via three small pulley groups 120. To maintain the connection rigidity of the small sliding door 20, the three sliding rails are arranged at the upper end, lower end and front end of the small sliding door 20.

[0032] The automatic folding mechanism 70 and the limiting device 80 are used for the automatic folding and locking of the small sliding door. The automatic folding mechanism 70 is installed on the large sliding door 10 and the small sliding door 20, and the limiting device 80 is installed on the body structure 30.

[0033] Figure 3 This is a detailed schematic diagram of the automatic folding mechanism 70 and the limiting device 80, which mainly consists of a locking hook 71, a locking post 72, a torsion spring 73, a limiting post 74, a limiting seat 81, and a rubber pad 82.

[0034] The locking hook 71 is installed at the upper rear end of the small sliding door 20, and a locking pin 72 and a torsion spring 73 are installed on it. The locking hook 71 can rotate around an axis, and the torsion force of the torsion spring 73 causes the locking hook 71 to rotate upward. There is a structural limit between the rear end of the locking hook 71 and the small sliding door 20, so that the locking hook 71 can only rotate upward to a horizontal position.

[0035] The limiting post 74 is installed on the large sliding door 10 and has a front and rear cylindrical structure. One cylindrical surface is used to hook and lock the lock hook 71 when the sliding door is closed, and the other cylindrical surface is used to strike the front inclined surface of the lock hook 71 when the sliding door is closed, thereby forcing the lock hook 71 to disengage from the limiting seat 81.

[0036] The limiting seat 81 is installed on the body structure 30, and it is provided with a ramp surface and a limiting groove. A rubber pad 82 is installed in the limiting groove, and the limiting groove is a limiting groove ramp surface.

[0037] like Figure 4 The diagram shows the working principle of the automatic folding mechanism 70 and the limiting device 80 during the opening and closing process. The specific working principle is as follows:

[0038] The specific opening process is as follows: After the sliding door is opened from the fully closed state, when the large sliding door 10 slides together with the locked small sliding door 20 to the position of the limiting device 80, the locking hook 71 first hits the ramp surface of the limiting seat 81, thereby forcing the locking hook 71 to rotate downward; then the locking hook 71 no longer hooks the limiting post 74, but the locking post 72 is still on the ramp surface and has not entered the limiting groove. At this time, the large sliding door 10 and the small sliding door 10 have been unlocked and separated; then the small sliding door 20 continues to slide under the action of inertia, forcing the locking post 72 to continue to slide along the ramp surface, and finally enters the limiting groove. The locking post 72 is stuck by the limiting groove of the limiting seat 81, and the small sliding door 20 stops sliding under the buffering action of the rubber pad 82; while the large sliding door 10 continues to slide, and the small sliding door 20 slides relative to the large sliding door 10 along the small door slide rail assembly 60. The small sliding door 20 is hidden inside the large sliding door 10 until it is fully open.

[0039] The specific closing process is as follows: After the sliding door begins to close from its fully open state, when the large sliding door 10 slides to the position of the limiting device 80, the limiting post 74 on the large sliding door 10 first hits the front inclined surface of the locking hook 71, thereby pressing the locking hook 71 to rotate downwards; after the limiting post 74 passes the tip of the locking hook 71, the locking hook 71 slightly rebounds and catches the limiting post 74. At this time, the large sliding door 10 and the small sliding door 20 have begun to engage, but the locking post 72 is still in the groove of the limiting seat 81 and has not completely disengaged; then the small sliding door 20, under the influence of inertia and the large sliding... Driven by the door 10, the locking pin 71 slides out of the limiting groove. At this time, the small sliding door 20 is completely disengaged from the limiting groove. The locking hook 71 continues to rebound and rotate under the torsion force of the torsion spring 73. The locking hook 71 rotates to the horizontal position and completely hooks the limiting pin 74 to lock. At the same time, the small pulley group 120 of the small sliding door 20 is limited at the end of the small door slide rail assembly 60, which can ensure that the locking hook 71 completely hooks the limiting pin 74. The large sliding door 10 continues to slide together with the locked small sliding door 20 until it is completely closed.

Claims

1. An automatic folding sliding door structure, characterized in that, It includes a large sliding door (10), a small sliding door (20), a large door slide rail assembly (50), a small door slide rail assembly (60), an automatic folding mechanism (70), and a limiting device (80); wherein the large door slide rail assembly (50) is fixed on the body structure (30), the large sliding door (10) slides in the large door slide rail assembly (50) via a large pulley group (110), the small sliding door (20) slides in the small door slide rail assembly (60) via a small pulley group (120), the automatic folding mechanism (70) is installed on the large sliding door (10) and the small sliding door (20), and the limiting device (80) is installed on the body structure (30). On the large sliding door (10), an automatic folding mechanism (70) and a limiting device (80) are used for the automatic folding and locking of the small sliding door (20); the automatic folding mechanism (70) includes a locking hook (71), a locking pin (72), a torsion spring (73), and a limiting pin (74); the limiting pin (74) is installed on the large sliding door (10), and the locking hook (71), locking pin (72), and torsion spring (73) are installed on the small sliding door (20); the limiting device (80) includes a limiting seat (81) and a rubber pad (82); the limiting seat (81) is provided with a ramp surface and a limiting groove ramp surface, and the rubber pad (82) is installed in the limiting groove; When the large sliding door (10) is closed, the small sliding door (20) automatically locks itself at its notch position, blocking the notch and forming a complete seal; when the large sliding door (10) is opened, the small sliding door (20) slides relative to and automatically locks itself to the front end of the large sliding door (10), avoiding the protruding short wing (40) on the fuselage structure (30); when the large sliding door (10) is completely closed, the locking hook (71) hooks onto the limiting post (74) and locks the small sliding door (20); when the large sliding door (10) is completely open, the limiting groove of the limiting seat (81) engages with the locking post (72) and maintains the limiting position on the small sliding door (20).

2. The automatic folding sliding door structure according to claim 1, characterized in that, The large sliding door (10) has a notch, and a small sliding door (20) is set at the notch position. The shape of the notch on the large sliding door matches the shape of the front end of the short wing.

3. The automatic folding sliding door structure according to claim 1, characterized in that, Five large pulley groups (110) are arranged at the four corners and the upper end of the notch of the large sliding door (10), which are connected to the four curved slide rails of the door slide rail assembly (50). The upper rear pulley group (110) is connected to the slide rail through the swing arm (100).

4. The automatic folding sliding door structure according to claim 1, characterized in that, The door sliding rail assembly (50) consists of four rails, which are installed on the body structure and are located at the upper end, lower end, middle rear end and lower rear end of the large sliding door, respectively. The middle rear end and lower rear end rails cross the upper and lower surfaces of the short wing, respectively. All four rails are rails with a bend at the front end.

5. The automatic folding sliding door structure according to claim 1, characterized in that, The small sliding door (20) is connected to the three straight slide rails of the small door slide rail assembly (60) through three small pulley groups (120). The three slide rails are arranged at the upper end, lower end and front end of the small sliding door (20).

6. The folding method of the automatic folding sliding door structure according to claim 1, characterized in that, The automatic folding and locking of the small sliding door (20) includes the opening and closing process. During the opening process, the locking pin (72) on the locking hook (71) hits the ramp surface of the limit seat (81), causing the locking hook (71) to disengage from the limit pin (74). The locking pin (72) enters the limit groove of the limit seat (81), thereby limiting the small sliding door (20). During the closing process, the limit pin (74) hits the front ramp surface of the locking hook (71), forcing the locking pin (72) to disengage from the limit groove of the limit seat (81). The locking hook (71) then hooks the limit pin (74), thereby locking the small sliding door (20).

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