Fixed main landing gear mounting structure

Abstract

The utility model relates to a fixed main landing gear mounting structure which comprises a fuselage of an airplane, a mounting block is fixedly connected to the fuselage, a reamed hole bolt is inserted into the mounting block, and the tail end of the reamed hole bolt sequentially penetrates through a spring washer, a main landing gear, a convex washer and a concave washer to be in threaded connection with a locking nut. A plurality of annular and evenly-distributed positioning clamping grooves are formed in the lower end face of the locking nut, the tail end of the reamed hole bolt is in threaded connection with a pin, and the pin is clamped in the clamping groove of the locking nut. A main undercarriage rib is arranged above one side of the main undercarriage, a C-shaped polyamide lining seat abuts against the lower end face of the main undercarriage rib, and the main undercarriage is sleeved with the polyamide lining seat. By using various gaskets, pins and lining seats, stress can be uniformly distributed among all the components, and meanwhile, the stress can be prevented from being uniformly distributed among all the components, so that the structural reliability of the undercarriage in the long-term use process is ensured, and the service life of the undercarriage is prolonged.

Claims

1. A fixed main landing gear mounting structure, comprising an aircraft fuselage (1), with a mounting block (2) fixedly connected to the fuselage (1), characterized in that: A dowel bolt (3) is inserted into the mounting block (2). The end of the dowel bolt (3) sequentially passes through a spring washer (4), the main landing gear (5), a convex washer (6) and a concave washer (7) and is screwed with a locking nut (8). A number of annularly and evenly distributed positioning grooves are formed on the lower end surface of the locking nut (8). A pin (9) is screwed at the end of the dowel bolt (3), and the pin (9) is clamped in the groove of the locking nut (8). Above one side of the main landing gear (5), there is a main landing gear rib (10). A "U"-shaped polyamide bushing (11) abuts against the lower end surface of the main landing gear rib (10). The polyamide bushing (11) is sleeved on the main landing gear (5). A flexible gasket (12) and a fixing rod (13) are provided below the main landing gear (5). Fastening bolts (14) are respectively inserted at both ends of the main landing gear (5). The fastening bolts (14) respectively pass through both ends of the fastening bolts (14) and the main landing gear rib (10) and are screwed and fixed with fastening nuts (15). The main landing gear rib (10) is clamped and fixed between the fixing rod (13) and the fixing rod (13).

2. The fixed main landing gear mounting structure according to claim 1, characterized in that: An articulated hole opposite to the dowel bolt (3) is formed in the middle of the mounting block (2). A number of mounting holes perpendicular to the articulated hole are formed on the mounting block (2) on both sides of the articulated hole. Fastening screws (19) are inserted into the mounting holes. The fastening screws (19) are screwed on the fuselage (1) and extend out of the inner side wall of the fuselage (1) and are screwed with a juxtaposed nut. The juxtaposed nut presses against the inner side wall of the fuselage (1).

3. The fixed main landing gear mounting structure according to claim 1, characterized in that: One side of the convex washer (6) is formed with a spherical convex surface, and one side of the concave washer (7) is formed with a spherical concave surface. The convex surface of the concave washer (7) abuts against the concave surface of the convex surface.

4. The fixed main landing gear mounting structure according to claim 1, characterized in that: Through holes opposite to the polyamide bushing (11) are formed at both ends of the polyamide bushing (11). The polyamide bushing (11) is clamped and fixed between the main landing gear rib (10) and the main landing gear (5).

5. The fixed main landing gear mounting structure according to claim 4, characterized in that: The main landing gear rib (10) includes a rib frame and a rectangular rib frame. The rib frames are welded and fixed together. The polyamide bushing (11) abuts against the rib frame. The fastening bolt (14) is inserted into the rib frame, and the fastening nut (15) presses against the inner side wall of the rib frame.

6. The fixed main landing gear mounting structure according to claim 1, characterized in that: Flat washers (16) are respectively sleeved on the dowel bolt (3) and the fastening bolt (14) between the concave washer (7) and the locking nut (8). A threaded hole perpendicular to the center of the dowel bolt (3) is formed on the dowel bolt (3). The pin (9) is screwed into the threaded hole of the pin (9).

7. The fixed main landing gear mounting structure according to claim 1, characterized in that: A grounding wire (17) is provided between the mounting block (2) and the main landing gear (5). Terminals are fixedly connected to both ends of the grounding wire (17). Positioning screws (18) are inserted into the terminals. The positioning screws (18) are respectively screwed and fixed on the mounting block (2) and the main landing gear (5).

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