Deflection adjusting mechanism for undercarriage down lock

Abstract

An undercarriage down lock deflection adjusting mechanism comprises an upper lock rod, a lower lock rod, a check block, an adjusting check block and a fixing base. The upper lock rod and the fixed seat are respectively mounted on the undercarriage, the upper lock rod is rotationally connected with the lower lock rod through a pin shaft, and a certain angle is reserved between the upper lock rod and the lower lock rod to form deflection; the stop block is fixed with the lower lock rod through a fastener, so that the stop block can rotate along with the lower lock rod; the impact surface of the check block and the impact surface of the adjusting check block are attached to each other and abut against each other, so that the lower lock rod cannot rotate when subjected to external force, and the deflection is kept unchanged; the adjusting check block and the fixing base are fixed through a fastener, and the contact faces of the adjusting check block and the fixing base are both of a tooth-shaped structure and are meshed with each other. The deflection value is adjusted by adjusting the position of the check block in the lower lock, so that the deflection value reaches a design value, and when large abrasion occurs, the lower lock can be maintained only by replacing the small check block in the structure without replacing large structural parts such as a lock rod.

Description

Technical Field

[0001] The invention relates to a deflection adjustment mechanism, in particular to a lower lock installation adjustment mechanism, and belongs to the field of aviation landing gear. Background Art

[0002] The lower lock mechanism of the landing gear is an important part of the landing gear. It locks the strut in the lowered position and also bears various loads during the lowering and working process. The reliability of the lower lock is closely related to its deflection value, but the deflection value of the lower lock will have a certain deviation during the processing and installation of parts. At present, the deflection of the lower lock is generally completed through processing, grinding, and multiple adaptations.

[0003] In the prior art, CN202368788U is an aircraft landing gear lower lock guide device. This invention is used to reduce the harmful impact between the landing gear and the lower lock and the fuselage. The deflection of the lock rod is fixed, but the device cannot adjust the deflection. CN110758724B is an aircraft landing gear lower position self-locking mechanism. This invention saves landing gear space and reduces the weight of the landing gear, but the deflection adjustment and locking impact wear problems are not solved. The article "Analysis of the Fault of the Main Landing Gear Lower Lock Not Locked" analyzes the cause and troubleshoots the fault event of the lower lock of a certain type of aircraft landing gear not being locked. It only makes suggestions on maintenance methods and corrosion lubrication, and does not provide an analysis of the mechanical structure. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and propose a landing gear lower lock deflection adjustment mechanism, which adjusts the deflection value by adjusting the position of the block in the lower lock to reach the designed value, and when severe wear occurs, it is not necessary to replace larger structural parts such as the lock rod, but only to replace the small block in the structure to complete its maintenance.

[0005] The technical solution of the present invention is: a landing gear lower lock deflection adjustment mechanism, comprising an upper locking rod, a lower locking rod, a stopper, an adjusting stopper and a fixing seat; the upper locking rod and the fixing seat are respectively installed on the landing gear, the upper locking rod is rotatably connected with the lower locking rod through a pin shaft, and a certain angle is left between the upper locking rod and the lower locking rod to form a deflection; the stopper is fixed to the lower locking rod through a fastener, so that the stopper can rotate with the lower locking rod; the impact surface of the stopper and the impact surface of the adjusting stopper are fitted and supported against each other, so that the lower locking rod will not rotate when subjected to external force, thereby keeping the deflection unchanged; the adjusting stopper and the fixing seat are fixed by fasteners, and the contact surfaces of the adjusting stopper and the fixing seat are both toothed structures, and are meshed with each other.

[0006] The adjusting block is provided with a fixing screw hole and a toothed surface; the fixing seat is provided with a U-shaped hole and a toothed structure; the toothed surface of the block and the toothed surface of the fixing seat are meshed with each other to prevent relative slippage. The angle of the toothed bevel of the fixing seat is 3° to 10°, so that the adjustment range of the deflection is between -5mm and 5mm.

[0007] When the mechanism is installed, the adjusting block is adjusted along the toothed structure of the fixing seat, and the adjusting block and the fixing seat are fixed together by screws and nuts, so that the smooth surface of the adjusting block and the smooth surface of the block are pressed against each other, so that the upper locking rod and the lower locking rod form a designed angle to ensure the accuracy of the deflection value.

[0008] If the deflection changes due to wear during landing gear inspection, move the adjustment block along the toothed slope of the fixed seat to adjust the angle between the upper locking rod and the lower locking rod so that the deflection value reaches the design value; if it is found that the wear is serious and exceeds the adjustment range, directly replace the block and adjust the block.

[0009] The adjusting stopper is a rectangular stopper, one end plane of which is an impact surface, and the other end is a toothed structure, and the angles of the two end surfaces are 10° to 20°.

[0010] The adjusting stopper 5 is a rectangular seat, one end of which is a toothed structure capable of meshing with the toothed structure of the stopper 4, and the other end is a fixed plane, with a U-shaped through hole penetrating between the two end surfaces.

[0011] The method for adjusting the deflection of the lower lock of the landing gear by using the mechanism comprises:

[0012] The lower locking rod 2 is fixedly connected to the stopper 3 by screws. Under the action of external force, the stopper 3 rotates downward along the rotating axis of the lower locking rod 2. When the impact surface of the stopper 3 fits the impact surface of the adjustment stopper 4, the adjustment stopper 4 prevents the rotation of the lower locking rod 2 and the stopper 3, thereby ensuring the stability of the lower locking rod.

[0013] The deflection value of the lower lock is measured. If the deflection value does not reach the design value, the deflection value is changed by adjusting the adjustment block 4 to reach the design value.

[0014] The deflection value is changed by adjusting the adjustment block 4 to reach the design value. When the actual deflection value is greater than the design deflection value, the adjustment block 4 is adjusted downward along the tooth structure of the fixing seat 5 until the deflection value meets the design value requirement. At this time, the tooth structures between the block 4 and the fixing seat 5 are engaged with each other to ensure the stability of the deflection value. The block 4 and the fixing seat 5 are fastened using screws 6 and nuts 7.

[0015] The deflection value is changed by adjusting the adjustment block 4 to reach the design value. When the actual deflection value is less than the design deflection value, the adjustment block 4 is adjusted upward along the tooth structure of the fixing seat 5 until the deflection value meets the design value requirement. The tooth structures between the block 4 and the fixing seat 5 are engaged with each other to ensure the stability of the deflection value. The block 4 and the fixing seat 5 are fastened using screws 6 and nuts 7.

[0016] The advantages of the present invention compared with the prior art are:

[0017] (1) The present invention adopts a structure in which the lower locking rod 2 and the stopper 3 are separated, thereby reducing the number of times the lower locking rod 2 is replaced due to impact deformation and wear, and reducing the maintenance cost of the lower locking mechanism;

[0018] (2) In the present invention, the deflection value can be freely adjusted by adjusting the stopper 4 during the assembly and debugging stage, thereby eliminating processing and assembly errors and improving assembly efficiency and accuracy.

[0019] (3) The fixing seat 5 of the present invention adopts a U-shaped groove, and the adjustment block 4 is fixed by screws and nuts, which is convenient for adjustment.

[0020] (4) The present invention can flexibly adjust the deflection according to the tooth-shaped structure, and compared with the fixed deflection value of the prior art, the lower lock installation can be completed efficiently and accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention.

[0022] Figure 2 Schematic diagram of adjusting the stopper in an embodiment of the present invention.

[0023] Figure 3 Schematic diagram of a fixed base in an embodiment of the present invention.

[0024] Figure 4 It is a schematic diagram of the toothed structure of the adjusting block and the fixing seat in the embodiment of the present invention. DETAILED DESCRIPTION

[0025] like Figure 1The mechanism of the present invention shown in the figure comprises an upper locking rod 1, a lower locking rod 2, a stopper 3, an adjusting stopper 4, a fixing seat 5, a screw 6 and a nut 7; the upper locking rod 1 and the fixing seat 5 are respectively installed at corresponding positions of the landing gear, the upper locking rod 1 is rotatably connected with the lower locking rod 2 through a pin shaft, a certain angle is maintained between the upper locking rod 1 and the lower locking rod 2 to form a deflection, the stopper 3 is fixed to the lower locking rod 2 in a conventional manner, so that the stopper 3 can rotate with the lower locking rod 2, the smooth surface of the stopper 3 and the smooth surface of the adjusting stopper 4 fit against each other, so that the lower locking rod 2 will not rotate when subjected to external force, thereby keeping the deflection unchanged, the toothed surface of the adjusting stopper 4 meshes with the toothed surface of the fixing seat 5, and the adjusting stopper 4 is fixed to the fixing seat 5 through the screw 6 and the nut 7.

[0026] During the lowering process of the landing gear, the block 3 will rotate with the lower locking rod 2, and the smooth surface of the block 3 will hit the smooth surface of the adjusting block 4. The present invention designs a detachable impact surface to prevent the end face of the lower locking rod 2 from being hit. When the block 3 is hit multiple times and worn and deformed, it can directly replace the lower locking rod 2 and keep the deflection unchanged, thereby achieving the effect of low cost and easy maintenance.

[0027] like Figure 2 , 4 As shown, the adjusting block 4 is provided with a fixing screw hole and a toothed surface. The adjusting block 4 is a rectangular block, one end plane is a collision surface, the other end is a toothed structure, and the angles of the two end surfaces are 10° to 20°. Figure 3 The fixing seat 5 shown is provided with a U-shaped hole and a toothed structure. The adjusting block 4 meshes with the toothed structure of the fixing seat 5 to prevent relative slippage. During installation, the adjusting block 4 can be adjusted along the toothed inclined surface of the fixing seat 5, and the adjusting block 4 and the fixing seat 5 are fixed together by screws 6 and nuts 7, so that the smooth surface of the adjusting block 4 and the smooth surface of the block 3 are pressed against each other, so that the upper locking rod 1 and the lower locking rod 2 form a designed angle, ensuring the accuracy of the deflection value and compensating for the processing error.

[0028] Figure 1 The lower lock deflection structure shown can be used for a long time and multiple times. During the inspection of the landing gear, if the deflection is found to change due to wear, the adjustment block 4 can be moved along the toothed inclined surface of the fixing seat 5 by the above method to adjust the angle between the upper locking rod 1 and the lower locking rod 2 so that the deflection value reaches the designed value. When it is severely worn and exceeds the adjustment range, the block 3 and the adjustment block 4 can be directly replaced.

[0029] Figure 3 The tooth profile bevel angle described in the method can be flexibly selected between 3° and 10°, so that the deflection can be adjusted within a range of -5 mm to 5 mm.

[0030] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solution of the present invention by using the technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A landing gear lower lock deflection adjustment mechanism, characterized in that: It comprises an upper locking rod, a lower locking rod, a stopper, an adjusting stopper and a fixing seat; the upper locking rod and the fixing seat are respectively installed on the landing gear, the upper locking rod is rotatably connected with the lower locking rod through a pin shaft, and a certain angle is left between the upper locking rod and the lower locking rod to form a deflection; the stopper is fixed to the lower locking rod through a fastener, so that the stopper can rotate with the lower locking rod; the impact surface of the stopper and the impact surface of the adjusting stopper are mutually fitted and supported, so that the lower locking rod will not rotate when subjected to external force, thereby keeping the deflection unchanged; The adjusting block and the fixing seat are fixed by fasteners, and the contact surfaces of the adjusting block and the fixing seat are both tooth-shaped structures and mesh with each other.

2. A landing gear lower lock deflection adjustment mechanism according to claim 1, characterized in that: The adjusting stopper is provided with a fixing screw hole and a toothed surface; the fixing seat is provided with a U-shaped hole and a toothed structure; the toothed surface of the stopper and the toothed surface of the fixing seat mesh with each other to prevent relative slippage.

3. A landing gear lower lock deflection adjustment mechanism according to claim 2, characterized in that: When the mechanism is installed, the adjusting block is adjusted along the toothed structure of the fixing seat, and the adjusting block and the fixing seat are fixed together by screws and nuts, so that the smooth surface of the adjusting block and the smooth surface of the block are pressed against each other, so that the upper locking rod and the lower locking rod form a designed angle to ensure the accuracy of the deflection value.

4. A landing gear lower lock deflection adjustment mechanism according to claim 3, characterized in that: If the deflection changes due to wear during the inspection of the landing gear, the adjustment block is moved along the toothed slope of the fixed seat to adjust the angle between the upper locking rod and the lower locking rod so that the deflection value reaches the design value; When it is found that the wear is serious and exceeds the adjustment range, directly replace the block and adjust the block.

5. The landing gear lower lock deflection adjustment mechanism according to claim 1, characterized in that: The angle of the toothed bevel of the fixing seat is between 3° and 10°, so that the adjustment range of the deflection is between -5mm and 5mm.

6. A landing gear lower lock deflection adjustment mechanism according to claim 1, characterized in that: The adjusting stopper is a rectangular stopper, one end plane of which is an impact surface, and the other end is a toothed structure, and the angles of the two end surfaces are 10° to 20°.

7. A landing gear lower lock deflection adjustment mechanism according to claim 6, characterized in that: The adjusting stopper is a rectangular seat, one end of which is a toothed structure capable of meshing with the toothed shape of the stopper, and the other end is a fixed plane, with a U-shaped through hole penetrating between the two end surfaces.

8. A method for adjusting the deflection of the lower lock of a landing gear using the mechanism of claim 1, characterized in that: include: The lower locking rod is fixedly connected to the stopper by screws. Under the action of external force, the stopper rotates downward along the rotating axis of the lower locking rod. When the impact surface of the stopper fits the impact surface of the adjustment stopper, the adjustment stopper prevents the rotation of the lower locking rod and the stopper, thereby ensuring the stability of the lower locking rod. Measure the deflection value of the lower lock. If the deflection value does not reach the design value, change the deflection value by adjusting the adjustment block to reach the design value.

9. The method according to claim 8, characterized in that The deflection value is changed by adjusting the adjustment block to reach the design value. When the actual deflection value is greater than the design deflection value, the adjustment block is adjusted downward along the tooth structure of the fixed seat until the deflection value meets the design value requirement. At this time, the tooth structures between the block and the fixed seat are engaged with each other to ensure the stability of the deflection value. The block and the fixed seat are fastened with screws and nuts.

10. The method according to claim 8, characterized in that The deflection value is changed by adjusting the adjustment block 4 to reach the design value. When the actual deflection value is less than the design deflection value, the adjustment block is adjusted upward along the tooth structure of the fixed seat until the deflection value meets the design value requirement. The tooth structures between the block and the fixed seat are engaged with each other to ensure the stability of the deflection value. The block and the fixed seat are fastened with screws and nuts.

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