An aircraft door linkage mechanism with integrated safety spring function

Abstract

The present invention provides an aircraft cabin door linkage mechanism with an integrated safety spring function, belonging to the field of civil aircraft cabin door mechanisms. The present invention comprises a driven crank, an elastic connecting rod, an active crank, a compression spring, and a limit pin. The driven crank and the active crank are connected by the elastic connecting rod and hingedly connected to the cabin door structure. A limit pin is arranged above the driven crank to limit the position. The elastic connecting rod is formed by the upper and lower guide rods that fit together to form a retractable connecting rod structure. The upper guide rod has an oblong hole, and a stop pin is provided in the hole so as to be movably connected to the lower guide rod. A compression spring is installed between the upper and lower guide rods to compress the elastic connecting rod in its longest state. The present invention integrates the cabin door safety spring mechanism into the cabin door's transmission four-bar mechanism, reducing the number of mechanisms, reducing the weight of the cabin door, improving the basic reliability of the mechanism, reducing the space requirements for the mechanism layout, and reducing the design difficulty. The structural components are simple in form and can be widely applied to various types of cabin door mechanism designs.

Description

Technical Field

[0001] The present invention belongs to the field of civil aircraft cabin door mechanisms, and relates to an aircraft cabin door connecting rod mechanism with an integrated safety spring function, and in particular to a transmission connecting rod mechanism applied to a civil aircraft cabin door and with an integrated safety spring function. Background Art

[0002] To ensure the safety of civil aircraft cabin doors and prevent them from accidentally opening, airworthiness regulations clearly require safety measures to hold the door latch mechanism in the fully latched and locked position. Currently, over-center spring mechanisms are commonly used as safety measures to hold the door mechanism in the fully closed position. Over-center spring mechanisms consist of two components: a spring rod and a crank, and are typically independent. Linkage mechanisms are very commonly used transmission mechanisms on cabin doors. Their primary function is to transmit motion between various mechanisms, and they are also typically independent. Placing a large number of mechanisms on a cabin door increases the design difficulty, increases the door weight, and reduces the basic reliability of the mechanism. Summary of the Invention

[0003] The present invention provides an aircraft cabin door linkage mechanism with an integrated safety spring function, which integrates the cabin door's safety spring mechanism into a transmission linkage mechanism, thereby merging the two mechanisms, significantly reducing the number of mechanisms, saving mechanism layout space, and reducing the cabin door weight.

[0004] In order to achieve the above object, the specific technical solutions adopted by the present invention are as follows:

[0005] An aircraft cabin door connecting rod mechanism with an integrated safety spring function comprises a driven crank 1, an elastic connecting rod 2, an active crank 3, a compression spring 9, and a limit pin 11.

[0006] One end of the driven crank 1 is hingedly connected to the door structure, and the other end is hingedly connected to the upper end of the elastic connecting rod 2. The lower end of the elastic connecting rod 2 is hingedly connected to one end of the active crank 3, and the other end of the active crank 3 is hingedly connected to the door structure.

[0007] The limit pin 11 is arranged above the driven crank 1 and is fixedly connected to the hatch structure to limit the upward movement of the driven crank 1.

[0008] The elastic connecting rod 2 is a retractable connecting rod structure, on which a compression spring 9 is installed. The elastic connecting rod 2 includes an upper guide rod 4, a lower guide rod 5, a stop pin 6, an upper boss 7, a lower boss 8 and an oblong hole 10; the upper end of the upper guide rod 4 is hinged to the driven crank 1, the lower end of the lower guide rod 5 is hinged to the active crank 3, and the lower guide rod 5 is arranged inside the cavity of the upper guide rod 4, and the two are slidably matched; an oblong hole 10 is opened on the outer wall surface of the upper guide rod 4, and a circular hole is opened on the outer wall surface of the lower guide rod 5, and the stop pin 6 passes through the oblong hole 10 and the lower guide rod 5 The circular hole of the upper guide rod 4 and the lower guide rod 5 are matched with the aperture of the circular hole, and the upper guide rod 4 and the lower guide rod 5 are connected. When the upper guide rod 4 and the lower guide rod 5 undergo relative displacement, the stop pin 6 moves in the oblong hole 10; an upper boss 7 is provided on the lower side of the oblong hole 10 on the outer wall of the upper guide rod 4, and a lower boss 8 is provided in the lower area of the outer wall of the lower guide rod 5. The compression spring 9 is sleeved on the elastic connecting rod 2 and placed between the upper boss 7 and the lower boss 8, with its two ends respectively pressed against the surfaces of the upper boss 7 and the lower boss 8, pressing the elastic connecting rod 2 to the longest length state.

[0009] Furthermore, the upper guide rod 4 and the lower guide rod 5 are both cylindrical cavity structures.

[0010] Working process: When the hatch is fully closed, the compression spring 9 presses the elastic link 2 to its longest length, at which point the stop pin 6 contacts the lower surface of the oblong hole 10. When the hatch is driven to open, the handle mechanism drives the active crank 3 to rotate upward, and the driven crank 1 is blocked by the limit pin 11 and cannot rotate. The active crank 3 needs to overcome the spring force of the compression spring 9 before it can rotate further. The compression spring 9 acts as a safety spring. Further turning the handle causes the active crank 3 to drive the elastic link 2, and the stop pin 6 slides in the oblong hole 10. The length of the elastic link 2 constantly changes to ensure normal movement of the mechanism. After the active crank 3 rotates past the center line, the elastic link 2 extends again, and the stop pin 6 contacts the lower surface of the oblong hole 10 again. After that, the length of the elastic link 2 remains unchanged, and the active crank 3 drives the driven crank 1 to rotate downward. The rotation of the driven crank 1 drives the movement of other mechanisms of the hatch, thus realizing motion transmission between mechanisms.

[0011] Beneficial effects of the present invention:

[0012] 1. The present invention integrates the safety spring mechanism of the hatch into the transmission four-bar mechanism of the hatch, eliminating the need to design a separate safety spring mechanism, reducing the number of mechanisms, reducing the weight of the hatch, and improving the basic reliability of the mechanism.

[0013] 2. For small hatches with tight mechanism layout, the present invention can effectively reduce the space requirement of the mechanism layout and reduce the difficulty of mechanism design.

[0014] 3. Wide range of applications: The present invention adopts typical connection structures, and the structural parts are simple in form, which can be widely promoted and applied to the design of various types of hatch mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of the present invention when the hatch is in the fully closed position.

[0016] Figure 2 This is a cross-sectional view of the elastic connecting rod structure of the present invention.

[0017] In the figure: 1 driven crank; 2 elastic connecting rod; 3 driving crank; 4 upper guide rod; 5 lower guide rod; 6 stop pin; 7 upper boss; 8 lower boss; 9 compression spring; 10 oblong hole; 11 limit pin. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below, but is not intended to limit the present invention in any way.

[0019] like Figure 1 As shown, an aircraft cabin door connecting rod mechanism with an integrated safety spring function includes a driven crank 1, an elastic connecting rod 2, an active crank 3, a compression spring 9, and a limit pin 11.

[0020] One end of the driven crank 1 is hingedly connected to the door structure, and the other end is hingedly connected to the upper end of the elastic connecting rod 2. The lower end of the elastic connecting rod 2 is hingedly connected to one end of the active crank 3, and the other end of the active crank 3 is hingedly connected to the door structure.

[0021] The limit pin 11 is arranged above the driven crank 1 and is fixedly connected to the hatch structure to limit the upward movement of the driven crank 1.

[0022] like Figure 2As shown, the elastic connecting rod 2 is a telescopic connecting rod structure, on which a compression spring 9 is installed, including an upper guide rod 4, a lower guide rod 5, a stop pin 6, an upper boss 7, a lower boss 8 and an oblong hole 10; the upper end of the upper guide rod 4 is hinged to the driven crank 1, and the lower end of the lower guide rod 5 is hinged to the active crank 3. The upper guide rod 4 and the lower guide rod 5 are both cylindrical cavity structures, and the lower guide rod 5 is arranged inside the cylinder of the upper guide rod 4, and the two are slidably matched; an oblong hole 10 is opened on the cylindrical surface of the upper guide rod 4, and a circular hole is opened on the cylindrical surface of the lower guide rod 5 The stop pin 6 passes through the oblong hole 10 and the circular hole of the lower guide rod 5. The stop pin 6 matches the aperture of the circular hole of the lower guide rod 5 to connect the upper guide rod 4 and the lower guide rod 5. When the upper guide rod 4 and the lower guide rod 5 undergo relative displacement, the stop pin 6 moves in the oblong hole 10; an upper boss 7 is provided on the lower side of the oblong hole 10 on the outer wall of the upper guide rod 4, and a lower boss 8 is provided in the lower area of the outer wall of the lower guide rod 5. The compression spring 9 is sleeved on the elastic connecting rod 2 and placed between the upper boss 7 and the lower boss 8, with its two ends pressed against the surfaces of the upper boss 7 and the lower boss 8 respectively.

[0023] Working process: Figure 1 As shown, when the hatch is fully closed, the compression spring 9 compresses the elastic connecting rod to its longest length, and the stop pin 6 contacts the lower surface of the oblong hole 10. When the hatch is driven to open, the handle mechanism drives the active crank 3 to rotate. The driven crank 1 is blocked by the stop pin 11 and cannot rotate. The active crank 3 needs to overcome the spring force of the compression spring 9 to rotate further, and the compression spring 9 acts as a safety spring. Further rotation of the handle drives the elastic connecting rod 2, and the stop pin 6 slides within the oblong hole 10. The length of the elastic connecting rod 2 continuously changes to ensure normal movement of the mechanism. After the active crank 3 rotates a certain angle (i.e., after the active crank 3 rotates past the centerline), the stop pin 6 contacts the lower surface of the oblong hole 10 again. The length of the elastic connecting rod 2 then remains unchanged, and the active crank 3 can drive the driven crank 1 to rotate. The rotation of the driven crank 1 drives the movement of other mechanisms of the hatch, achieving motion transmission between mechanisms.

[0024] The above-described embodiments merely express the implementation methods of the present invention, but should not be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. An aircraft door linkage mechanism with an integrated safety spring function, characterized in that: The aircraft cabin door connecting rod mechanism comprises a driven crank (1), an elastic connecting rod (2), an active crank (3), a compression spring (9), and a limit pin (11); One end of the driven crank (1) is hingedly connected to the door structure, and the other end is hingedly connected to the upper end of the elastic connecting rod (2); the lower end of the elastic connecting rod (2) is hingedly connected to one end of the active crank (3); and the other end of the active crank (3) is hingedly connected to the door structure; The limit pin (11) is arranged above the driven crank (1) and is fixedly connected to the door structure, and is used to limit the upward movement of the driven crank (1); The elastic connecting rod (2) is a telescopic connecting rod structure, on which a compression spring (9) is installed, and the compression spring (9) compresses the elastic connecting rod (2) to a state of maximum length; The elastic connecting rod (2) comprises an upper guide rod (4), a lower guide rod (5), a stop pin (6) and an oblong hole (10); the upper end of the upper guide rod (4) is hinged to the driven crank (1), the lower end of the lower guide rod (5) is hinged to the active crank (3), and the lower guide rod (5) is arranged inside the cavity of the upper guide rod (4), and the two are slidably matched; an oblong hole (10) is opened on the outer wall surface of the upper guide rod (4), and a circular hole is opened on the outer wall surface of the lower guide rod (5); the stop pin (6) passes through the oblong hole (10) and the circular hole of the lower guide rod (5), and the stop pin (6) matches the aperture of the circular hole of the lower guide rod (5) to connect the upper guide rod (4) and the lower guide rod (5); when the upper guide rod (4) and the lower guide rod (5) undergo relative displacement, the stop pin (6) moves in the oblong hole (10).

2. The aircraft door linkage mechanism with integrated safety spring function according to claim 1, characterized in that: An upper boss (7) is provided on the lower side of the oblong hole (10) on the outer wall of the upper guide rod (4), and a lower boss (8) is provided in the lower area of the outer wall of the lower guide rod (5). A compression spring (9) is sleeved on the elastic connecting rod (2) and placed between the upper boss (7) and the lower boss (8), with its two ends respectively pressed against the surfaces of the upper boss (7) and the lower boss (8).

3. The aircraft door linkage mechanism with integrated safety spring function according to claim 1, characterized in that: The upper guide rod (4) and the lower guide rod (5) are both cylindrical cavity structures.

4. The aircraft door linkage mechanism with integrated safety spring function according to claim 1, characterized in that: The working process of the aircraft cabin door linkage mechanism is as follows: when the cabin door is fully closed, the compression spring (9) presses the elastic link (2) to the longest length state, at which time the stop pin (6) contacts the lower surface of the oblong hole (10); when the cabin door is driven to open, the handle mechanism drives the active crank (3) to rotate upward, and the driven crank (1) is blocked by the limit pin (11) and cannot rotate. The active crank (3) needs to overcome the spring force of the compression spring (9) before it can rotate further, and the compression spring (9) acts as a safety spring; further rotating the handle, the active crank (3) The movable crank (3) drives the elastic connecting rod (2), and the stop pin (6) slides in the oblong hole (10), and the length of the elastic connecting rod (2) is constantly changed to ensure the normal movement of the mechanism; after the active crank (3) rotates to pass the center line, the elastic connecting rod (2) is extended again, and the stop pin (6) contacts the lower surface of the oblong hole (10) again, and then the length of the elastic connecting rod (2) remains unchanged, and the active crank (3) drives the driven crank (1) to rotate downward, and the rotation of the driven crank (1) drives the movement of other mechanisms of the hatch, thereby realizing the motion transmission between the mechanisms.

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