Upturning type cabin door supporting mechanism
By designing a truss-type support mechanism for the top-hinged hatch and utilizing the combined structure of the lower and upper trusses, stable locking under inertial loads and sudden wind loads was achieved, thus solving the stability problem of the top-hinged hatch in the open state.
Patent Information
- Application Number
- CN202512014431.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-29
- Publication Date
- 2026-03-03
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing upward-opening hatch has poor stability when open, especially when subjected to inertial loads and sudden wind loads, the front end of the hatch deforms greatly, resulting in unstable locking.
An upward-opening hatch support mechanism was designed, including a lower truss and an upper truss. It achieves stable locking when the hatch is fully open by an electric latch lock, and the truss structure enhances the stability of the hatch.
It improves the stability of the top-hinged hatch when it is open, effectively resists loads from different directions, prevents hatch deformation, and ensures reliable locking.
Smart Images
Figure CN121590734A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of aircraft structural design technology, and specifically relates to an upward-folding cabin door support mechanism. Background Technology
[0002] Some large transport aircraft are equipped with top-hinged hatches to meet requirements such as direct loading and unloading, loading channels, and operating environments. These hatches need to be fully opened and locked on the ground to create a passageway for cargo loading and unloading. In the open state, they primarily bear inertial loads and gust loads. Therefore, top-hinged hatches require a stable and reliable locking mechanism to reliably lock them in the fully open position. Most top-hinged hatches achieve locking through a drive mechanism that locks the hatch in the fully open position. However, because the drive mechanism is often close to the hatch's pivot point, this locking method results in significant deformation of the front end of the hatch under gust loads, leading to poor stability. Summary of the Invention
[0003] To address the aforementioned issues, this application provides an upward-folding hatch support mechanism, which mainly includes a lower truss, an upper truss, and an electric latch lock.
[0004] One end of the upper truss is hinged to the front end of the fuselage fixed structure, and the other end is provided with an upper truss joint. One end of the lower truss is hinged to the top-hinged hatch, and the other end is provided with a lower truss joint. The upper truss joint has a mating plate with hinge holes and elongated holes. The lower truss joint has hinge lugs with holes and locking pin lugs. The hinge holes and hinge lugs are connected by a pin. The elongated holes and locking pin lugs are aligned when the top-hinged hatch is in the open position and are connected by an electric bolt lock.
[0005] Preferably, the upper truss includes an upper truss welded truss, one end of which is detachably connected to a double-eared joint for hinged connection with the front end of the fuselage fixed structure, and the other end of which is fixed to an upper truss connecting sleeve, which is detachably connected to the upper truss joint.
[0006] Preferably, one end of the upper truss welded truss connecting the double-ear joint is an outer cylinder, and the double-ear joint has an inner cylinder extending into the outer cylinder, and the outer cylinder and the inner cylinder are connected by bolts.
[0007] Preferably, the upper truss joint has an inner cylinder, and the upper truss connecting sleeve of the upper truss welded truss is sleeved with the inner cylinder and connected by bolts.
[0008] Preferably, the upper truss welded truss has two arms, left and right, which are close to each other at the connection with the upper truss joint. Each arm has two rods, front and rear, which are respectively connected to the inner cylinders on the four branches of the upper truss joint through the upper truss connecting sleeves on each rod.
[0009] Preferably, the inner cylinders of the upper truss joint are connected to each other by upper truss reinforcing strips.
[0010] Preferably, the left and right arms of the upper truss welded truss are connected by at least two transverse support frames.
[0011] Preferably, the upper truss joint and the double-ear joint are stainless steel machined parts, the upper truss welded truss is welded from 30CrMnSiA pipe, and the upper truss reinforcing strip plate and the upper truss connecting sleeve are both 7050 aluminum alloy machined parts.
[0012] Preferably, the lower truss includes a lower truss welded truss, one end of which is detachably connected to a single-ear joint for hinged connection with the upward-opening hatch, and the other end of which is fixed with a lower truss connecting sleeve, which is detachably connected to the lower truss joint.
[0013] Preferably, one end of the lower truss welded truss connecting single-ear joint is an outer cylinder, and the single-ear joint has an inner cylinder extending into the outer cylinder, and the outer cylinder and the inner cylinder are connected by bolts.
[0014] Preferably, the lower truss joint has an inner cylinder, and the lower truss connecting sleeve of the lower truss welded truss is sleeved with the inner cylinder and connected by bolts.
[0015] Preferably, the lower truss welded truss has two arms, left and right, which are close to each other at the connection with the lower truss joint. Each arm has two rods, front and rear, which are respectively connected to the inner cylinders on the four branches of the lower truss joint through the lower truss connecting sleeves on each rod.
[0016] Preferably, the inner cylinders of the lower truss joints are connected by a lower truss reinforcing strip plate.
[0017] Preferably, the left and right arms of the lower truss welded truss are connected by at least two transverse support frames.
[0018] Preferably, the lower truss joint and the single-ear joint are stainless steel machined parts, the lower truss welded truss is welded from 30CrMnSiA pipe, and the lower truss connecting sleeve and the lower truss reinforcing strip are both 7050 aluminum alloy machined parts.
[0019] Preferably, a spherical bearing is provided in the hinge hole and / or the through hole of the hinged ears.
[0020] Preferably, the mating plate of the upper truss joint has a limiting profile at the end with the elongated hole, and correspondingly, the two lugs of the locking pin of the lower truss joint have a mating profile at their connection.
[0021] Preferably, the locking pin ears of the lower truss joint are connected to the lock housing of the electric bolt lock via a flange, and the lock cylinder of the electric bolt lock can pass through the locking pin ears and the elongated hole located in the locking pin ears under the control of the controller.
[0022] This application makes the tilting hatch more stable during the opening process and in the fully opened position by setting a truss-type opening position lock separately at the far end of the tilting hatch. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the support structure position when the hatch is closed, representing a preferred embodiment of the top-opening hatch support mechanism of this application.
[0024] Figure 2 This is a schematic diagram showing the location of the support structure after the hatch is opened upwards.
[0025] Figure 3 This is a structural diagram of the support mechanism of this application when the hatch is closed.
[0026] Figure 4 This is a structural diagram of the support mechanism of this application when the hatch is open.
[0027] Figure 5 This is a schematic diagram of the connection between the upper and lower trusses at their initial positions.
[0028] Figure 6 This is a schematic diagram of the connection between the upper and lower trusses when they are in the middle position.
[0029] Figure 7 This is a schematic diagram of the connection between the upper and lower trusses when they are in the unfolded position.
[0030] Figure 8 This is a schematic diagram of the upper truss structure.
[0031] Figure 9 This is a schematic diagram of the main lower truss structure.
[0032] Figure 10 This is a schematic diagram of the upper truss joint structure.
[0033] Figure 11 This is a schematic diagram of the lower truss joint structure.
[0034] Among them, 1-lower truss, 2-upper truss, 3-electric latch lock, 4-sealed hatch, 5-double-ear joint, 6-welded upper truss, 7-upper truss connecting sleeve, 8-upper truss joint, 81-hinge hole, 82-oblong hole, 83-limiting profile, 9-upper truss reinforcing strip plate, 10-lower truss joint, 101-hinge double ears, 102-locking pin double ears, 103-fitting profile, 11-lower truss connecting sleeve, 12-welded lower truss, 13-single-ear joint, 14-lower truss reinforcing strip plate, 201-fuselage fixed structure, 202-upward-opening hatch, 203-rotating shaft, 204-fuselage, 205-actuator. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0036] This application provides an upward-folding hatch support mechanism, such as Figure 1 and Figure 11 As shown, it mainly includes a lower truss 1, an upper truss 2, and an electric bolt lock 3;
[0037] One end of the upper truss 2 is hinged to the front end of the fuselage fixed structure 201, and the other end is provided with an upper truss joint 8. One end of the lower truss 1 is hinged to the top-opening hatch 202, and the other end is provided with a lower truss joint 10. The upper truss joint 8 has a mating plate with a hinge hole 81 and an elongated hole 82. The lower truss joint 10 has a hinge double ear 101 with holes and a locking pin double ear 102. The hinge hole 81 and the hinge double ear 101 are connected by a pin. The elongated hole 82 and the locking pin double ear 102 are aligned when the top-opening hatch 202 is in the open state and are connected by an electric bolt lock 3.
[0038] like Figure 1 As shown, the upward-opening hatch 202 rotates around the pivot 203 under the action of the actuator 205 to open the hatch. Once opened, it appears as... Figure 2 As shown, this application provides a support mechanism on the fuselage fixing structure 201 near the upward-opening cabin door 202 at the front of the fuselage 204, by... Figure 1 The lower truss 1 shown and Figure 2 The upper truss 2 shown is composed of [the structure].
[0039] Figure 1 When the hatch shown is closed, the support mechanism is as follows: Figure 3 As shown, the upper truss 2 is at the top, and the lower truss 1 is at the bottom. After the hatch is opened, the lower truss 1 flips upwards along with the hatch, as shown. Figure 4 As shown.
[0040] Figure 8 and Figure 9 Structural diagrams for both trusses are provided. (Reference) Figure 8 In some alternative embodiments, the upper truss 2 includes an upper truss welded truss 6, one end of which is detachably connected to a double-eared connector 5 for hinged connection to the front end of the fuselage fixing structure 201, and the other end of the upper truss welded truss 6 is fixed with an upper truss connecting sleeve 7, which is detachably connected to the upper truss connector 8.
[0041] In some alternative embodiments, one end of the upper truss welded truss 6 connected to the double-ear joint 5 is an outer cylinder, and the double-ear joint 5 has an inner cylinder extending into the outer cylinder, and the outer cylinder and the inner cylinder are connected by bolts.
[0042] In this embodiment, the modular design facilitates manufacturing, transportation, and on-site installation and commissioning. If a component (such as a joint) is damaged, it can be replaced individually without replacing the entire truss, reducing maintenance costs and time. The connecting sleeve structure provides a reliable force transmission path.
[0043] In some alternative embodiments, the upper truss joint 8 has an inner cylinder, and the upper truss connecting sleeve 7 of the upper truss welded truss 6 is sleeved with the inner cylinder and connected by bolts.
[0044] This socket and bolt connection method is simple in structure, reliable in force transmission, has high connection strength, and is easy to adjust and disassemble. Compared with direct welding, it avoids the potential impact of the welding heat-affected zone on material properties.
[0045] In some alternative embodiments, the upper truss welded truss 6 has two arms, left and right, which are close to each other at the connection with the upper truss joint 8. Each arm has two rods, front and rear, and are respectively connected to the inner cylinders on the four branches of the upper truss joint 8 through the upper truss connecting sleeves 7 on each rod.
[0046] This four-branch structure forms a stable spatial support frame that can effectively resist loads from different directions (such as crosswinds and vibrations), greatly enhancing the bending and torsional stiffness of the entire support mechanism and preventing excessive deformation at the joints.
[0047] In some alternative embodiments, the branch inner cylinders of the upper truss joint 8 are connected by upper truss reinforcing strips 9.
[0048] The reinforced strip significantly improves the structural stiffness and strength of the upper truss joint body, preventing relative displacement or deformation of its branches when under load, and ensuring the accuracy of docking with the lower truss joint.
[0049] In some alternative embodiments, the left and right arms of the upper truss welded truss 6 are connected by at least two transverse support frames.
[0050] In this embodiment, a transverse connecting rod is provided between the left and right support arms to form a triangular or rectangular stable structure.
[0051] In some alternative embodiments, the upper truss joint 8 and the double-ear joint 5 are stainless steel machined parts, the upper truss welded truss 6 is welded from 30CrMnSiA pipe, and the upper truss reinforcing strip plate 9 and the upper truss connecting sleeve 7 are both 7050 aluminum alloy machined parts.
[0052] The materials used in this application balance strength, weight, and corrosion resistance. Joints are made of stainless steel, which is wear- and corrosion-resistant; the main load-bearing truss is made of high-strength steel to ensure core strength; and non-critical connectors are made of high-strength aluminum alloy, effectively reducing structural weight and meeting the weight reduction requirements of the aerospace industry.
[0053] refer to Figure 9 In some alternative embodiments, the lower truss 1 includes a lower truss welded truss 12, one end of which is detachably connected to a single-ear joint 13 for hinged connection with the upturned hatch 202, and the other end of the lower truss welded truss 12 is fixed with a lower truss connecting sleeve 11, which is detachably connected to the lower truss joint 10.
[0054] In some alternative embodiments, one end of the lower truss welded truss 12 connected to the single-ear joint 13 is an outer cylinder, and the single-ear joint 13 has an inner cylinder extending into the outer cylinder, and the outer cylinder and the inner cylinder are connected by bolts.
[0055] In some alternative embodiments, the lower truss joint 10 has an inner cylinder, and the lower truss connecting sleeve 11 of the lower truss welded truss 12 is sleeved with the inner cylinder and connected by bolts.
[0056] In some alternative embodiments, the lower truss welded truss 12 has two arms, left and right, which are close to each other at the connection with the lower truss joint 10. Each arm has two rods, front and rear, and are respectively connected to the inner cylinders on the four branches of the lower truss joint 10 through the lower truss connecting sleeves 11 on each rod.
[0057] In some alternative embodiments, the branch inner cylinders of the lower truss joint 10 are connected by a lower truss reinforcing strip 14.
[0058] In some alternative embodiments, the left and right arms of the lower truss welded truss 12 are connected by at least two transverse support frames.
[0059] In some alternative embodiments, the lower truss joint 10 and the single-ear joint 13 are stainless steel machined parts, the lower truss welded truss 12 is welded from 30CrMnSiA pipe, and the lower truss connecting sleeve 11 and the lower truss reinforcing strip plate 14 are both 7050 aluminum alloy machined parts.
[0060] refer to Figure 10 In some alternative embodiments, a spherical bearing is provided in the through hole of the hinge hole 81 and / or the hinge double lug 101.
[0061] refer to Figure 10 and Figure 11 In some alternative embodiments, the mating plate of the upper truss joint 8 is provided with a limiting profile 83 at the end with an elongated hole 82, and correspondingly, the two lugs of the locking pin double lug 102 of the lower truss joint 10 are provided with a mating profile 103 at the connection of the two lugs.
[0062] refer to Figure 9 In some alternative embodiments, the locking pin ears 102 of the lower truss joint 10 are connected to the lock housing of the electric bolt lock 3 via a flange, and the lock cylinder of the electric bolt lock 3 can pass through the locking pin ears 102 and the elongated hole 82 located in the locking pin ears 102 under the control of the controller 4.
[0063] refer to Figures 5-7 When the hatch is closed, such as Figure 5 As shown, the locking pins 102 and oblong holes 82 of the two trusses are not fully aligned, nor are they locked by the electric bolt lock 3. When the hatch begins to open, the hatch causes the lower truss 1 to deflect first, as... Figure 6 As shown, during continued deflection, the lower truss 1 drives the upper truss 2 to deflect until the hatch is fully open. At this point, the lower truss 1 is positioned above the upper truss 2. Through motion path optimization, the joint alignment between the upper truss 2 and the lower truss 1 is ensured to be as shown in the diagram. Figure 7 As shown, the elongated hole 82 aligns with the locking pin double lugs 102, the electric bolt lock 3 is inserted, locking the upper truss 2 and the lower truss 1. After confirming that the lock is engaged, the lifting hatch retraction actuator releases pressure, and at this time the lifting hatch is locked.
[0064] This application incorporates a truss-type upward-opening door locking mechanism between the fuselage structure and the upward-opening door, which makes the door more stable during movement and in the fully open state under the influence of gravity and gust loads.
[0065] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A flip-up hatch support mechanism, characterized in that, Includes a lower truss (1), an upper truss (2), and an electric bolt lock (3); One end of the upper truss (2) is hinged to the front end of the fuselage fixed structure (201), and the other end is provided with an upper truss joint (8). One end of the lower truss (1) is hinged to the top-hinged hatch (202), and the other end is provided with a lower truss joint (10). The upper truss joint (8) has a mating plate, and the mating plate is provided with a hinge hole (81) and an elongated hole (82). The lower truss joint (10) has a hinge double ear (101) with holes and a locking pin double ear (102). The hinge hole (81) and the hinge double ear (101) are connected by a pin. The elongated hole (82) and the locking pin double ear (102) are connected to each other when the top-hinged hatch (202) is in the open state, and are connected by an electric bolt lock (3).
2. The upward-opening hatch support mechanism as described in claim 1, characterized in that, The upper truss (2) includes an upper truss welded truss (6), one end of which is detachably connected to a double-eared connector (5) for hinged connection with the front end of the fuselage fixing structure (201), and the other end of the upper truss welded truss (6) is fixed with an upper truss connecting sleeve (7), which is detachably connected to the upper truss connector (8).
3. The upward-opening hatch support mechanism as described in claim 2, characterized in that, The upper truss welded truss (6) is connected to the double-ear joint (5) at one end as an outer cylinder. The double-ear joint (5) has an inner cylinder that extends into the outer cylinder. The outer cylinder and the inner cylinder are connected by bolts.
4. The upward-opening hatch support mechanism as described in claim 2, characterized in that, The upper truss joint (8) has an inner cylinder, and the upper truss connecting sleeve (7) of the upper truss welded truss (6) is sleeved with the inner cylinder and connected by bolts.
5. The upward-opening hatch support mechanism as described in claim 4, characterized in that, The upper truss welded truss (6) has two arms, left and right. The two arms are close to each other at the connection with the upper truss joint (8). Each arm has two rods, front and rear, and are respectively connected to the inner cylinders on the four branches of the upper truss joint (8) through the upper truss connecting sleeves (7) on each rod.
6. The upward-opening hatch support mechanism as described in claim 5, characterized in that, The inner cylinders of the upper truss joint (8) are connected by the upper truss reinforcing strip (9).
7. The upward-opening hatch support mechanism as described in claim 5, characterized in that, The left and right arms of the upper truss welded truss (6) are connected by at least two transverse support frames.
8. The upward-opening hatch support mechanism as described in claim 5, characterized in that, The upper truss joint (8) and the double-ear joint (5) are stainless steel machined parts. The upper truss welded truss (6) is welded from 30CrMnSiA pipe. The upper truss reinforcing strip plate (9) and the upper truss connecting sleeve (7) are both 7050 aluminum alloy machined parts.
9. The upward-opening hatch support mechanism as described in claim 1, characterized in that, The lower truss (1) includes a lower truss welded truss (12), one end of which is detachably connected to a single-ear joint (13) for hinged connection with the upturned hatch (202), and the other end of the lower truss welded truss (12) is fixed with a lower truss connecting sleeve (11), which is detachably connected to the lower truss joint (10).
10. The upward-opening hatch support mechanism as described in claim 9, characterized in that, The lower truss welded truss (12) is connected to a single-ear joint (13) at one end, which is an outer cylinder. The single-ear joint (13) has an inner cylinder that extends into the outer cylinder. The outer cylinder and the inner cylinder are connected by bolts.
11. The upward-opening hatch support mechanism as described in claim 9, characterized in that, The lower truss joint (10) has an inner cylinder, and the lower truss connecting sleeve (11) of the lower truss welded truss (12) is sleeved with the inner cylinder and connected by bolts.
12. The upward-opening hatch support mechanism as described in claim 11, characterized in that, The lower truss welded truss (12) has two arms, left and right. The two arms are close to each other at the connection with the lower truss joint (10). Each arm has two rods, front and rear, and are respectively connected to the inner cylinders on the four branches of the lower truss joint (10) through the lower truss connecting sleeves (11) on each rod.
13. The upward-opening hatch support mechanism as described in claim 11, characterized in that, The inner cylinders of the lower truss joint (10) are connected by the lower truss reinforcing strip plate (14).
14. The upward-opening hatch support mechanism as described in claim 11, characterized in that, The left and right arms of the lower truss welded truss (12) are connected by at least two transverse support frames.
15. The upward-opening hatch support mechanism as described in claim 11, characterized in that, The lower truss joint (10) and the single-ear joint (13) are stainless steel machined parts. The lower truss welded truss (12) is welded from 30CrMnSiA pipe. The lower truss connecting sleeve (11) and the lower truss reinforcing strip plate (14) are both 7050 aluminum alloy machined parts.
16. The upward-opening hatch support mechanism as described in claim 1, characterized in that, A spherical bearing is provided in the through hole of the hinge hole (81) and / or the hinged double ears (101).
17. The upward-opening hatch support mechanism as described in claim 1, characterized in that, The mating plate of the upper truss joint (8) is provided with a limiting profile (83) at the end with an elongated hole (82), and correspondingly, the two lugs of the locking pin double lugs (102) of the lower truss joint (10) are provided with a mating profile (103) at the connection of the two lugs.
18. The upward-opening hatch support mechanism as described in claim 1, characterized in that, The locking pin ears (102) of the lower truss joint (10) are connected to the lock housing of the electric bolt lock (3) through a flange. The lock cylinder of the electric bolt lock (3) can pass through the locking pin ears (102) and the elongated hole (82) located in the locking pin ears (102) under the control of the controller (4).