A landing gear structure
By adding reinforcing plates and stiffeners to the landing gear mounting slots, the problem of stress concentration at the bushings in the landing gear structure of light aircraft was solved, achieving the effects of increased strength and reduced weight.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG WANFENG ENGINE MFG CO LTD
- Filing Date
- 2025-07-25
- Publication Date
- 2026-07-17
AI Technical Summary
The existing landing gear structure of light aircraft has stress concentration at the bushing, which leads to damage to the landing gear slots. It is necessary to increase the strength of the mounting slots to prevent damage.
Reinforcing plates and stiffeners are added at the bends and bushing locations of the landing gear mounting slots. Carbon fiber plates and copper bushings are used, and the connection strength is enhanced by bonding and screwing. Nylon locking sleeves and locking bolts are used for further fixation.
It effectively improves the strength of the landing gear mounting slot, avoids damage to the landing gear slot, saves costs and reduces weight.
Smart Images
Figure CN224511445U_ABST
Abstract
Description
Technical Field:
[0001] The utility model relates to the technical field of the installation slot of the landing gear on the aircraft fuselage, and more specifically to a landing gear structure. Background Art:
[0002] The landing gear of a light aircraft is an important part of the aircraft, mainly used to support the weight of the aircraft on the ground, absorb the impact energy during landing, and ensure the stability and flexibility of the aircraft during ground taxiing. The landing gear structure of existing light aircraft is generally a rocker arm structure, in which the wheels are connected to the shock absorber through the rocker arm. The upper end of the rocker arm is inserted into the landing gear slot of the aircraft fuselage and is hinged to the aircraft fuselage through a hinge shaft. The fuselage structure of existing light aircraft is mainly formed by curing carbon cloth pasted together with a mixed solution of resin and glue. In order to achieve the lightweight of the light aircraft, the thickness of the fuselage is relatively moderate, and the thickness at the landing gear slot is not very thick. When connecting the hinge shaft, a bushing is required, and the bushing is required to be inserted and fixed on the side walls on both sides of the landing gear slot. When the aircraft lands, the stress of the landing gear is concentrated at the bushing, and the bushing is likely to cause damage to the landing gear slot. Therefore, a landing gear slot structure that can effectively and stably support the bushing needs to be designed. Content of the Utility Model:
[0003] The purpose of the utility model is to provide a landing gear structure for the deficiencies of the existing technology. Reinforcement plates and rib plate structures are added at the bending part of the landing gear installation slot connected to the fuselage and the part where the bushing is installed, which can effectively improve the strength of the landing gear installation slot and avoid damage to the landing gear installation slot.
[0004] A landing gear structure includes a landing gear installation slot with a "冂"-shaped cross-section in the light aircraft fuselage. A "冂"-shaped front connection side plate is formed around the rear end of the landing gear installation slot. Side connection side plates connected to the front connection side plate are respectively formed on both sides of the landing gear installation slot. A side reinforcement plate with an L-shaped cross-section is fixedly pasted between the side connection side plate and the landing gear installation slot. A rear reinforcement plate with an L-shaped cross-section and a "冂" shape is fixedly pasted between the landing gear installation slot and the front connection side plate. The two ends of the rear reinforcement plate are respectively connected to the rear ends of the side reinforcement plates.
[0005] A rectangular lining plate is formed on the upper side of the side reinforcement plate. The lining plates are respectively fixedly pasted on the outer walls on both sides of the landing gear installation slot. Horizontal metal bushings are respectively inserted and fixed on the outer walls on both sides of the landing gear installation slot and the lining plates. A vertical and channel-shaped reinforcement rib plate is fixedly pasted on the outer side wall of the lining plate. The lower end of the reinforcement rib plate is fixedly pasted on the side reinforcement plate. The outer end of the metal bushing is inserted into the reinforcement rib plate.
[0006] Preferably, the landing gear mounting slot, front connecting side plate, side connecting side plate, side reinforcing plate, liner, rear reinforcing plate and reinforcing rib plate are all made of carbon fiber plate, and the metal bushing is made of copper bushing, with the roughness of the inner surface of the metal bushing being higher than the roughness of the outer surface of the metal bushing.
[0007] Preferably, the inner end of the metal bushing is formed with a regular hexagonal inner retaining ring, which abuts against the inner side wall of the landing gear mounting slot. A locking nut is screwed onto the metal bushing, and the locking nut is inserted into the reinforcing rib and abuts against the outer side walls on both sides of the landing gear mounting slot.
[0008] Preferably, the opposite sidewalls of the locking nut abut against the inner sidewalls of the front and rear sides of the reinforcing rib plate, respectively.
[0009] Preferably, a nylon locking sleeve and a clamping plate are inserted into the reinforcing rib plate. Both the nylon locking sleeve and the clamping plate are sleeved on the metal bushing. The nylon locking sleeve is clamped and fixed between the reinforcing rib plate and the clamping plate and is compressed and expanded to clamp and fix it on the metal bushing.
[0010] The front and rear sidewalls of the reinforcing rib are formed with grooves, and the front and rear sides of the clamp are formed with lugs. The lugs extend out of the grooves of the reinforcing rib and are screwed with transverse locking bolts. The ends of the locking bolts press against the liner.
[0011] Preferably, a circular pressure plate is fixed to the end of the locking bolt, and the pressure plate presses against the liner.
[0012] The beneficial effects of this utility model are as follows:
[0013] The landing gear mounting slot is reinforced with reinforcing plates and stiffeners at the bends where it connects to the fuselage and at the bushing mounting points. This effectively improves the strength of the landing gear mounting slot and prevents damage to it. Attached image description:
[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0015] Figure 2 This is a frontal view of the structure of this utility model;
[0016] Figure 3 This is a side view of the structure of this utility model;
[0017] Figure 4 This is a top view of the structure of this utility model.
[0018] In the figure: 1. Landing gear mounting groove; 11. Front connecting side plate; 12. Side connecting side plate; 2. Side reinforcement plate; 21. Liner plate; 22. Rear reinforcement plate; 3. Metal bushing; 4. Locking nut; 5. Reinforcement rib plate; 6. Splint; 61. Ear; 7. Nylon locking sleeve; 8. Locking bolt. Detailed implementation method:
[0019] Embodiment: See Figures 1 to 4 As shown, a landing gear structure includes a landing gear mounting groove 1 with a "冂"-shaped cross-section inside the light aircraft fuselage. A "冂"-shaped front connecting side plate 11 is formed around the rear end of the landing gear mounting groove 1. Side connecting side plates 12 are respectively formed on both sides of the landing gear mounting groove 1 and are connected to the front connecting side plate 11. A side reinforcement plate 2 with an L-shaped cross-section is fixedly pasted between the side connecting side plate 12 and the landing gear mounting groove 1. A rear reinforcement plate 22 with an L-shaped cross-section and a "冂"-shape is fixedly pasted between the landing gear mounting groove 1 and the front connecting side plate 11. The two ends of the rear reinforcement plate 22 are respectively connected to the rear ends of the side reinforcement plates 2.
[0020] A rectangular liner plate 21 is formed on the upper side of the side reinforcement plate 2. The liner plates 21 are respectively fixedly pasted on the outer walls on both sides of the landing gear mounting groove 1. Transverse metal bushings 3 are respectively inserted and fixed on the outer walls on both sides of the landing gear mounting groove 1 and the liner plates 21. A vertical and channel-shaped reinforcement rib plate 5 is fixedly pasted on the outer side wall of the liner plate 21. The lower end of the reinforcement rib plate 5 is fixedly pasted on the side reinforcement plate 2. The outer ends of the metal bushings 3 are inserted on the reinforcement rib plate 5.
[0021] The landing gear mounting groove 1, the front connecting side plate 11, the side connecting side plate 12, the side reinforcement plate 2, the liner plate 21, the rear reinforcement plate 22 and the reinforcement rib plate 5 are all made of carbon fiber plates. The metal bushing 3 is made of a copper sleeve. The surface roughness of the inner surface of the metal bushing 3 is higher than that of the outer surface of the metal bushing 3. The inner surface of the metal bushing 3 is used to install the hinge shaft of the aircraft landing gear, so it is required to have a higher surface roughness to reduce wear when connecting with the hinge shaft. At the same time, riveting edges are formed at both ends of the metal bushing 3 by a press riveting method. The riveting edges at both ends of the metal bushing 3 respectively abut against the reinforcement rib plate 5 and the landing gear mounting groove 1. In order to further prevent the radial rotation of the metal bushing 3, a mixed liquid of resin and glue is used to fixedly paste the metal bushing 3 to the reinforcement rib plate 5 and the landing gear mounting groove 1. The adhesion positions of the mixed liquid are all within the reinforcement rib plate 5.
[0022] The inner end of the metal bushing 3 is formed with a regular hexagonal inner retaining ring, which abuts against the inner side wall of the landing gear mounting slot 1. A locking nut 4 is screwed onto the metal bushing 3. The locking nut 4 is inserted into the reinforcing rib plate 5 and abuts against the outer side walls on both sides of the landing gear mounting slot 1. If the above-mentioned riveting and pasting method is used, the metal bushing 3 cannot be disassembled, repaired or replaced. Therefore, a threaded connection method can be used to fix the metal bushing 3.
[0023] The locking nut 4 has two opposing side walls that abut against the inner side walls of the front and rear sides of the reinforcing rib plate 5, respectively. The locking nut 4 is restricted by the reinforcing rib plate 5. The metal bushing 3 can be installed and removed by rotating the inner retaining ring of the metal bushing 3.
[0024] The reinforcing rib 5 is fitted with a nylon locking sleeve 7 and a clamping plate 6. Both the nylon locking sleeve 7 and the clamping plate 6 are fitted onto the metal bushing 3. The nylon locking sleeve 7 is clamped and fixed between the reinforcing rib 5 and the clamping plate 6. In order to prevent the metal bushing 3 from loosening, a nylon locking sleeve 7 is added. The nylon locking sleeve 7 can be clamped and fixed onto the metal bushing 3 by compression and expansion.
[0025] The front and rear sidewalls of the reinforcing rib plate 5 have grooves 51 formed, and the front and rear sides of the clamp plate 6 have lugs 61 formed. The lugs 61 extend out of the grooves 51 of the reinforcing rib plate 5 and are screwed with transverse locking bolts 8. The ends of the locking bolts 8 press against the liner plate 21.
[0026] The locking bolt 8 has a circular pressure plate fixed to its end. The pressure plate presses against the liner 21. The pressure plate can increase the effective area of the locking bolt 8 on the liner 21, thus preventing damage to the liner 21 when the locking bolt 8 is tightened.
[0027] Working principle: This structure is a landing gear structure, specifically a landing gear mounting slot 1 support structure on the aircraft fuselage. It fixes the side reinforcement plate 2 and the rear reinforcement plate 22 by pasting at the bend of the landing gear mounting slot 1. At the same time, a liner plate 21 is added at the installation position of the metal bushing 3. The liner plate 21, the side reinforcement plate 2 and the rear reinforcement plate 22 are all connected together, which can improve the overall strength of the landing gear mounting slot 1. Compared with the overall thickening of the landing gear mounting slot 1, it can save costs and effectively reduce weight.
[0028] Meanwhile, in order to further improve the support and connection strength of the metal bushing 3, a reinforcing rib plate 5 of channel steel structure was added, which can further prevent damage to the landing gear mounting groove 1 at the metal bushing 3.
[0029] The embodiments described herein are illustrative and not intended to limit the scope of the invention. Any person skilled in the art can modify the embodiments without departing from the spirit and scope of the invention; therefore, the scope of protection of the invention should be as set forth in the claims.
Claims
1. A landing gear structure, comprising a landing gear mounting groove (1) with a "冂"-shaped inner cross-section in the light aircraft fuselage. A front connecting side plate (11) with a "冂"-shape is formed around the rear end of the landing gear mounting groove (1). Side connecting side plates (12) connected to the front connecting side plate (11) are respectively formed on both sides of the landing gear mounting groove (1), and it is characterized in that: A side reinforcing plate (2) with an L-shaped cross-section is fixedly pasted between the side connecting edge plate (12) and the landing gear mounting groove (1). A rear reinforcing plate (22) with an L-shaped cross-section and in a "冂" shape is fixedly pasted between the landing gear mounting groove (1) and the front connecting edge plate (11). The two ends of the rear reinforcing plate (22) are respectively connected to the rear end of the side reinforcing plate (2). A rectangular lining plate (21) is formed on the upper side edge of the side reinforcing plate (2). The lining plates (21) are respectively fixedly pasted on the outer walls on both sides of the landing gear mounting groove (1). Transverse metal bushings (3) are respectively inserted and fixed on the outer walls on both sides of the landing gear mounting groove (1) and on the lining plates (21). A vertically arranged channel-shaped reinforcing rib plate (5) is fixedly pasted on the outer side wall of the lining plate (21). The lower end of the reinforcing rib plate (5) is fixedly pasted on the side reinforcing plate (2). The outer end of the metal bushing (3) is inserted into the reinforcing rib plate (5).
2. A landing gear structure according to claim 1, characterised in that: The landing gear mounting groove (1), the front connecting edge plate (11), the side connecting edge plate (12), the side reinforcing plate (2), the lining plate (21), the rear reinforcing plate (22) and the reinforcing rib plate (5) are all made of carbon fiber plates. The metal bushing (3) is made of a copper bushing. The roughness of the inner surface of the metal bushing (3) is higher than that of the outer surface of the metal bushing (3).
3. A landing gear structure according to claim 1, characterised in that: A regular hexagon inner retaining ring is formed at the inner end of the metal bushing (3). The inner retaining ring abuts against the inner side wall of the landing gear mounting groove (1). A locking nut (4) is screwed on the metal bushing (3). The locking nut (4) is inserted into the reinforcing rib plate (5) and abuts against the outer side walls on both sides of the landing gear mounting groove (1).
4. A landing gear arrangement according to claim 3, wherein: The two opposite side walls of the locking nut (4) respectively abut against the inner side walls on the front and rear sides of the reinforcing rib plate (5).
5. A landing gear structure according to claim 3, wherein: A nylon locking sleeve (7) and a clamping plate (6) are inserted into the reinforcing rib plate (5). The nylon locking sleeve (7) and the clamping plate (6) are both sleeved on the metal bushing (3). The nylon locking sleeve (7) is clamped and fixed between the reinforcing rib plate (5) and the clamping plate (6) and is compressed and expanded to clamp and fix on the metal bushing (3). Notches (51) are formed on the side walls on the front and rear sides of the reinforcing rib plate (5). Ears (61) are formed on the front and rear side edges of the clamping plate (6). The ears (61) extend out of the notches (51) of the reinforcing rib plate (5) and a transverse locking bolt (8) is screwed. The end of the locking bolt (8) presses against the lining plate (21).
6. A landing gear structure according to claim 5, wherein: A circular pressing plate is fixedly connected to the end of the locking bolt (8). The pressing plate presses against the lining plate (21).