A machining tool for an aircraft landing gear wheel axle mounting seat

Abstract

The application discloses a machining tool for an aircraft landing gear wheel axle mounting seat, and is specially designed for the U-shaped structure of the aircraft landing gear wheel axle mounting seat and the specific layout of the axle holes in the two side walls of the U-shaped structure, a machining tool specially matched with the U-shaped structure and the specific layout of the axle holes in the two side walls is designed, and through the cooperation of a tool bar, a tool disc, an adjusting device and a shoulder guide sleeve, the precise machining of the bushing end face of the specific component is realized, and the technical blank of the special tool in the field is filled up. The manual driving mode is adopted instead of the machine tool power driving, the operator can adjust the feeding speed and the cutting force in real time and steplessly according to the machining state, and the vibration caused by the periodic cutting force fluctuation is avoided. Meanwhile, the guide section with the shoulder guide sleeve is inserted into the axle hole of the mounting seat, rigid support of the tool bar adjacent to the cutting point is provided, and the cutting force arm is shortened. The above-mentioned double effects basically eliminate the phenomena of tool vibration and tool biting in the machining process.

Description

Technical Field

[0001] This invention relates to the field of aerospace component processing technology, specifically to a machining tool for an aircraft landing gear wheel axle mounting base. Background Technology

[0002] The description in this section provides only background information related to the disclosure of this invention and does not constitute prior art.

[0003] The landing gear wheel axle mounting bracket is a key structural component that bears the impact force of aircraft landing. A bushing is typically press-fitted into its axle bore, and the machining accuracy of the bushing's end face directly affects the installation accuracy and service life of the wheel axle. Generally, the perpendicularity of the bushing end face to the axis of the axle bore should be ≤0.02mm, and the coaxiality should be ≤0.03mm.

[0004] Currently, there are no dedicated machining tools for machining the end face of the landing gear wheel axle mounting bushing. In practice, operators typically use general-purpose machine tools (such as lathes and milling machines) with general-purpose cutting tools. The mounting base is fixed on the machine tool's worktable, and the machine tool spindle drives the cutting tool to cut the end face of the bushing.

[0005] It should be noted that the above description of the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of the present invention and facilitating understanding by those skilled in the art. It should not be assumed that the above technical solutions are known to those skilled in the art simply because they have been described in the background section of this invention. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a machining tool for an aircraft landing gear wheel axle mounting seat.

[0007] To solve the above-mentioned technical problems, the present invention provides a machining tool for an aircraft landing gear wheel axle mounting base. The wheel axle mounting base has a shaft hole for mounting a wheel axle, and a bushing is press-fitted into the shaft hole. The machining tool is used to machine the end face of the bushing. The machining tool includes a tool holder, a tool disc sleeved and fixed on the tool holder, an adjusting device mounted on the tool holder, and a shouldered guide sleeve. The tool disc is located on the side of the shaft hole with the bushing to be machined. The shouldered guide sleeve is sleeved on the tool holder and can slide along the tool holder. The shouldered guide sleeve includes a guide section and a flange shoulder. The guide section is inserted into the shaft... In the hole, the flange shoulder is blocked outside the shaft hole. The shouldered guide sleeve and the bushing to be machined are respectively installed at both ends of the shaft hole. The adjusting device is located on the side of the shaft hole where the shouldered guide sleeve is installed. The adjusting device includes a fixed sleeve fixed on the tool bar and a bearing sleeve sleeved on the tool bar. The bearing sleeve is threadedly connected to the fixed sleeve. The bearing sleeve is located between the fixed sleeve and the shouldered guide sleeve. When the bearing sleeve is rotated, it can move along the axial direction of the tool bar to bring the end face of the bushing to be machined against the end face of the cutter head. When the tool bar is rotated, the end face of the bushing is machined.

[0008] Preferably, the tool holder is provided with a plurality of positioning holes, and the fixing sleeve includes a set screw mounting hole arranged radially. After the fixing sleeve is inserted into the positioning hole through the set screw installed in the set screw mounting hole, it is fixed to the tool holder. One end of the outer surface of the fixing sleeve is provided with an external thread. The bearing sleeve is provided with a bearing sleeve center hole at its center. One end of the bearing sleeve center hole is provided with an internal thread. The internal thread of the bearing sleeve is threadedly connected to the external thread of the fixing sleeve. The side wall of the bearing sleeve is also provided with a plurality of turning holes. When a machining tool is inserted into the turning holes, the bearing sleeve can be rotated to adjust the axial position of the bearing sleeve on the tool holder.

[0009] Preferably, a bearing mounting groove is provided circumferentially on one end face of the bearing sleeve facing away from the fixed sleeve, a bearing is installed in the bearing mounting groove, and a threaded sleeve is provided on the outer ring of the bearing for locking the bearing in the bearing mounting groove. The end face of the bearing protrudes axially relative to the end face of the bearing sleeve, and the protruding end face of the bearing is used to press against the shouldered guide sleeve.

[0010] Preferably, the tool holder includes a tool holder body and a tool disc mounting base fixed on the tool holder body. One end of the tool disc mounting base protrudes radially to form a retaining ring, and the other end of the tool disc mounting base is fitted with a locking sleeve. The tool disc mounting base is provided with a first keyway, and the center of the tool disc is provided with a tool disc center hole. Stepped portions are provided on both sides of the tool disc center hole. The tool disc center hole is provided with a second keyway axially. The tool disc is sleeved on the tool disc mounting base through the tool disc center hole. The tool disc is circumferentially positioned by the interaction of the first keyway, the second keyway, and a key installed in the first keyway and the second keyway. The retaining ring is placed in the stepped portion on one side of the tool disc center hole, and the locking sleeve is accommodated in the stepped portion on the other side of the tool disc center hole to achieve axial fixation of the tool disc.

[0011] Preferably, multiple blades are provided on both ends of the cutter head, and the cutting edges of the multiple blades located on the same end face of the cutter head are at the same height.

[0012] Preferably, the wheel shaft mounting base is a U-shaped structure, including two sidewalls each having a shaft hole. Bushings are press-fitted onto both sides of each shaft hole. The cutter head, adjusting device, and shouldered guide sleeve are detachably connected to the cutter bar. The machining tool is configured such that: when machining the bushing located on the side of the shaft hole facing away from the U-shaped structure, the cutter head is located on the outside of that sidewall, and the adjusting device is located between the two sidewalls; when machining the bushing located on the side of the shaft hole facing the U-shaped structure, the adjusting device is located on the outside of that sidewall, and the cutter head is located between the two sidewalls.

[0013] Preferably, the tool holder is driven manually.

[0014] Preferably, the guide section of the shouldered guide sleeve is clearance-fitted with the bushing, the tool holder is slidingly fitted with the flange shoulder, and the radial clearances between the guide section and the shaft hole, and between the tool holder and the flange shoulder, are configured such that the shouldered guide sleeve can rotate circumferentially within the shaft hole and the tool holder can slide axially, while controlling the radial runout of the tool holder to within 0.01 mm.

[0015] By employing the above technical solutions, the beneficial effects of the present invention are as follows: The present invention relates to a machining tool for an aircraft landing gear wheel axle mounting base. This application specifically designs a machining tool adapted to the U-shaped structure of the aircraft landing gear wheel axle mounting base and the specific layout of the shaft holes on its two side walls. Through the coordinated cooperation of the tool holder, tool disc, adjustment device and shoulder guide sleeve, the precise machining of the bushing end face of this specific component is achieved, filling the technical gap of special-purpose tools in this field.

[0016] This application employs a manual drive system instead of a power-driven system, allowing operators to adjust the feed rate and cutting force in real-time and steplessly according to the machining status, thus avoiding vibrations caused by periodic fluctuations in cutting force. Simultaneously, the guide section with a shouldered guide sleeve is inserted into the shaft hole of the mounting base, providing rigid support for the tool holder near the cutting point and shortening the cutting lever arm. These dual effects essentially eliminate tool vibration and chipping during machining. Furthermore, the precise fit between the shouldered guide sleeve and the shaft hole forces the rotation axis of the tool holder to coincide with the designed axis of the shaft hole, and the bushing end face is machined using this common axis as a reference. This results in a coaxiality of better than 0.03mm and a perpendicularity of better than 0.02mm between the machined bushing end face and the shaft hole axis.

[0017] The tool head, adjusting device, and shouldered guide bushing of this application are detachably connected to the tool holder. By exchanging the positions of the tool head and adjusting device, the bushing end faces located inside and outside the shaft holes on the two side walls of the U-shaped structure can be machined separately without re-clamping the workpiece. This design avoids the accumulation of positioning errors caused by secondary clamping, while simplifying the operation process and improving machining efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the machining tool of this application when machining the aircraft landing gear wheel axle mounting seat.

[0019] Figure 2 This is a schematic diagram of the machining tool of this application when machining the aircraft landing gear wheel axle mounting seat.

[0020] Figure 3 This is a schematic diagram of the structure of an aircraft landing gear wheel axle mounting base processed by the machining tool of this application.

[0021] Figure 4 This is a cross-sectional structural diagram of the machining tool of this application when machining the aircraft landing gear wheel axle mounting seat.

[0022] Figure 5 This is a cross-sectional structural diagram of the machining tool of this application when machining the aircraft landing gear wheel axle mounting seat.

[0023] Figure 6 yes Figure 5 A schematic diagram of the structure of part A.

[0024] Figure 7 yes Figure 5 A schematic diagram of the structure of part B.

[0025] Figure 8 This is a schematic diagram of the tool holder of this application.

[0026] Figure 9 This is a schematic diagram of the cutter head structure of this application.

[0027] Figure 10 This is a schematic diagram of the cutter head structure of this application.

[0028] Figure 11 This is a schematic diagram of the regulating device of this application.

[0029] Figure 12 This is a cross-sectional structural schematic diagram of the adjustment device of this application.

[0030] Figure 13 This is a schematic diagram of the structure of the fixing sleeve in this application.

[0031] Figure 14 This is a schematic diagram of the bearing sleeve of this application.

[0032] Figure 15 This is a cross-sectional structural diagram of the bearing sleeve of this application.

[0033] Figure 16 This is a schematic diagram of another state of the machining tool of this application when machining the aircraft landing gear wheel bearing housing.

[0034] The components are as follows: 1. Gear shaft mounting base; 11. Bushing; 12. Shaft hole; 2. Tool holder; 21. Tool holder body; 22. Positioning hole; 23. Tool disc mounting base; 24. First keyway; 25. Retaining ring; 3. Shoulder guide sleeve; 4. Fixing sleeve; 41. Set screw mounting hole; 42. External thread part; 5. Bearing sleeve; 51. Actuating hole; 52. Bearing mounting groove; 53. Bearing sleeve center hole; 54. Internal thread part; 6. Threaded sleeve; 7. Tool disc; 71. Blade; 72. Tool disc center hole; 73. Step part; 74. Second keyway; 8. Bearing; 9. Locking sleeve. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that in the description of this invention, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0037] like Figure 1-5 As shown, the present invention provides a machining tool for an aircraft landing gear wheel axle mounting bracket 1. As... Figure 3 As shown, the wheel shaft mounting base 1 is provided with a shaft hole 12 for mounting the wheel shaft. A bushing 11 is press-fitted into the shaft hole 12. The machining tool is used to machine the end face of the bushing 11. The machining tool includes a tool holder 2, a tool disc 7 sleeved and fixed on the tool holder 2, an adjusting device mounted on the tool holder 2, and a shouldered guide sleeve 3. The tool disc 7 is located on the side of the shaft hole 12 with the bushing 11 to be machined. The shouldered guide sleeve 3 is sleeved on the tool holder 2 and can slide along the tool holder 2. The shouldered guide sleeve 3 includes a guide section and a flange shoulder. The guide section is inserted into the shaft hole 12, and the flange shoulder is blocked by the guide section. Outside the shaft hole 12, the shouldered guide sleeve 3 and the bushing 11 to be machined are respectively installed at both ends of the shaft hole 12. The adjusting device is located on the side of the shaft hole 12 where the shouldered guide sleeve 3 is installed. The adjusting device includes a fixed sleeve 4 fixed on the tool bar 2 and a bearing sleeve 5 sleeved on the tool bar 2. The bearing sleeve 5 is threadedly connected to the fixed sleeve 4. The bearing sleeve 5 is located between the fixed sleeve 4 and the shouldered guide sleeve 3. When the bearing sleeve 5 is rotated, it can move along the axial direction of the tool bar 2 to bring the end face of the bushing 11 to be machined against the end face of the cutter head 7. When the tool bar 2 is rotated, the end face of the bushing 11 is machined.

[0038] like Figure 8 As shown, the tool holder 2 is provided with multiple positioning holes 22, and the fixing sleeve 4 includes a set screw mounting hole 41 arranged radially. After the fixing sleeve 4 is inserted into the positioning hole 22 by the set screw installed in the set screw mounting hole 41, it is fixed to the tool holder 2. One end of the outer surface of the fixing sleeve 4 is provided with an external thread portion 42. The bearing sleeve 5 is provided with a bearing sleeve center hole 53 at its center. One end of the bearing sleeve center hole 53 is provided with an internal thread portion 54. The internal thread portion 54 of the bearing sleeve 5 is threadedly connected to the external thread portion 42 of the fixing sleeve 4. Multiple turning holes 51 are also provided on the side wall of the bearing sleeve 5. When a machining tool is inserted into the turning hole 51, the bearing sleeve 5 can be rotated to adjust the axial position of the bearing sleeve 5 on the tool holder 2.

[0039] like Figure 11-15 As shown, a bearing mounting groove 52 is provided circumferentially on one end face of the bearing sleeve 5 facing away from the fixed sleeve 4. A bearing 8 is installed in the bearing mounting groove 52. A threaded sleeve 6 is also provided on the outer ring of the bearing. The threaded sleeve 6 is used to lock the bearing in the bearing mounting groove 52. The end face of the bearing protrudes axially relative to the end face of the bearing sleeve 5. The protruding end face of the bearing is used to press against the shouldered guide sleeve 3.

[0040] The tool holder 2 includes a tool holder body 21 and a tool disc mounting base 23 fixed on the tool holder body 21. One end of the tool disc mounting base 23 protrudes radially to form a retaining ring 25, and the other end of the tool disc mounting base 23 is fitted with a locking sleeve 9. The tool disc mounting base 23 is provided with a first keyway 24, and the center of the tool disc is provided with a tool disc center hole 72. Stepped portions 73 are provided on both sides of the tool disc center hole 72. The tool disc center hole 72 is provided with a second keyway 74 along the axial direction. The tool disc is fitted onto the tool disc mounting base 23 through the tool disc center hole 72. The tool disc is circumferentially positioned by the interaction of the first keyway 24, the second keyway 74, and the keys installed in the first keyway 24 and the second keyway 74. The retaining ring 25 is placed in the stepped portion 73 on one side of the tool disc center hole 72, and the locking sleeve 9 is accommodated in the stepped portion 73 on the other side of the tool disc center hole 72 to achieve axial fixation of the tool disc.

[0041] like Figure 9 and 10 As shown, multiple blades 71 are provided on both ends of the cutter head, and the cutting edges of the multiple blades 71 located on the same end face of the cutter head are at the same height.

[0042] like Figure 3 As shown, the wheel shaft mounting base 1 has a U-shaped structure, including two sidewalls each having a shaft hole 12. A bushing 11 is press-fitted onto both sides of each shaft hole 12. The cutter head, adjusting device, and shouldered guide sleeve 3 are detachably connected to the cutter bar 2. The machining tool is configured such that: when machining the bushing 11 located on the side of the shaft hole 12 facing away from the U-shaped structure, the cutter head is located outside the sidewall, and the adjusting device is located between the two sidewalls; when machining the bushing 11 located on the side of the shaft hole 12 facing towards the U-shaped structure, the adjusting device is located outside the sidewall, and the cutter head is located between the two sidewalls (e.g., ...). Figure 16 (As shown).

[0043] In a preferred embodiment, the tool holder 2 is driven manually.

[0044] The guide section of the shouldered guide sleeve 3 is clearance-fitted with the bushing 11, and the tool holder 2 is slidingly fitted with the flange shoulder. The radial clearances between the guide section and the shaft hole 12, and between the tool holder 2 and the flange shoulder, are configured to allow the shouldered guide sleeve 3 to rotate circumferentially within the shaft hole 12 and the tool holder 2 to slide axially, while controlling the radial runout of the tool holder 2 to within 0.01 mm.

[0045] The present invention relates to a machining tool for an aircraft landing gear wheel axle mounting seat 1. This application specifically designs a machining tool that is adapted to the U-shaped structure of the aircraft landing gear wheel axle mounting seat 1 and the specific layout of the shaft holes 12 on its two side walls. Through the coordinated cooperation of the tool holder 2, the tool disc, the adjustment device and the shoulder guide sleeve 3, the precise machining of the end face of the bushing 11 of this specific component is achieved, filling the technical gap of special tools in this field.

[0046] This application uses a manual drive instead of a machine tool power drive, allowing the operator to adjust the feed rate and cutting force in real time and steplessly according to the machining status, avoiding vibrations caused by periodic fluctuations in cutting force. Simultaneously, the guide section with the shouldered guide sleeve 3 is inserted into the shaft hole 12 of the mounting base, providing rigid support for the tool holder 2 near the cutting point and shortening the cutting lever arm. These dual effects essentially eliminate tool vibration and chipping during machining. Furthermore, due to the precise fit between the shouldered guide sleeve 3 and the shaft hole 12, the rotation axis of the tool holder 2 is forced to coincide with the designed axis of the shaft hole 12, and the end face of the bushing 11 is machined using this common axis as a reference. This results in a coaxiality better than 0.03 mm and a perpendicularity better than 0.02 mm between the machined end face of the bushing 11 and the axis of the shaft hole 12.

[0047] In this application, the cutter head, adjusting device, and shouldered guide sleeve 3 are detachably connected to the tool holder 2. By exchanging the positions of the cutter head and the adjusting device, the end faces of the bushings 11 located inside and outside the shaft hole 12 on the two side walls of the U-shaped structure can be machined separately without re-clamping the workpiece. This design avoids the accumulation of positioning errors caused by secondary clamping, while simplifying the operation process and improving machining efficiency.

[0048] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A machining tool for an aircraft landing gear wheel axle mounting base, characterized in that, The aforementioned wheel shaft mounting base is provided with a shaft hole for mounting the wheel shaft, a bushing is press-fitted into the shaft hole, and the aforementioned machining tool is used to machine the end face of the bushing. The machining tool includes a tool holder, a tool disc sleeved and fixed on the tool holder, an adjustment device mounted on the tool holder, and a guide sleeve with a shoulder. The cutter head is located on the side of the shaft hole with the bushing to be machined. The shouldered guide sleeve is fitted onto the tool holder and can slide along the tool holder. The shouldered guide sleeve includes a guide section and a flange shoulder. The guide section is inserted into the shaft hole, and the flange shoulder is blocked outside the shaft hole. The shouldered guide sleeve and the machined bushing are respectively installed at both ends of the shaft hole. The adjustment device is located on the side of the shaft hole where the shouldered guide sleeve is installed. The adjustment device includes a fixing sleeve fixed to the tool bar and a bearing sleeve sleeved on the tool bar. The bearing sleeve is threadedly connected to the fixing sleeve. The bearing sleeve is located between the fixed sleeve and the shouldered guide sleeve. When the bearing sleeve is rotated, it can move along the axial direction of the tool holder to bring the end face of the bushing to be machined against the end face of the tool disc. When the tool holder is rotated, the end face of the bushing is machined.

2. The machining tool according to claim 1, characterized in that, The tool holder is provided with multiple positioning holes. The fixing sleeve includes a radially arranged set screw mounting hole. After the fixing sleeve is inserted into the positioning hole through a set screw installed in the set screw mounting hole, it is fixed to the tool holder. One end of the fixing sleeve has an external threaded portion on its outer surface. The bearing sleeve has a central hole at its center, and one end of the central hole has an internal thread. The internal thread of the bearing sleeve is threadedly connected to the external thread of the fixing sleeve. The bearing sleeve is also provided with a plurality of actuation holes on its side wall. When a machining tool is inserted into the actuation holes, the bearing sleeve can be rotated to adjust the axial position of the bearing sleeve on the tool holder.

3. The machining tool according to claim 2, characterized in that, The bearing sleeve has a bearing mounting groove circumferentially provided on one end face away from the fixed sleeve. A bearing is installed in the bearing mounting groove. The outer ring of the bearing is also provided with a threaded sleeve. The threaded sleeve is used to lock the bearing in the bearing mounting groove. The end face of the bearing protrudes axially relative to the end face of the bearing sleeve. The protruding end face of the bearing is used to press against the shouldered guide sleeve.

4. The machining tool according to claim 3, characterized in that, The tool holder includes a tool holder body and a tool disc mounting base fixed to the tool holder body. One end of the tool disc mounting base protrudes radially to form a retaining ring, and the other end of the tool disc mounting base is fitted with a locking sleeve. The cutter head mounting base is provided with a first keyway. The cutter head has a central hole at its center, and stepped portions are provided on both sides of the central hole. A second keyway is formed along the axial direction of the central hole. The cutter head is fitted onto the cutter head mounting base through the cutter head center hole. The cutter head achieves circumferential positioning through the interaction of the first keyway, the second keyway, and the keys installed in the first keyway and the second keyway. The retaining ring is placed in the stepped portion on one side of the center hole of the cutter head, and the locking sleeve is accommodated in the stepped portion on the other side of the center hole of the cutter head to achieve axial fixation of the cutter head.

5. The machining tool according to claim 4, characterized in that, The cutter head is provided with multiple blades on both ends, and the cutting edges of the multiple blades on the same end face of the cutter head are at the same height.

6. The machining tool according to claim 5, characterized in that, The aforementioned wheel axle mounting base has a U-shaped structure, including two side walls each having a shaft hole. Bushings are press-fitted on both sides of each shaft hole. The cutter head, adjusting device, and shouldered guide sleeve are detachably connected to the cutter bar. The machining tool is configured as follows: When machining the bushing located on the side of the shaft hole facing away from the U-shaped structure, the cutter head is located outside the side wall, and the adjustment device is located between the two side walls. When machining the bushing located on the side of the shaft hole facing the interior of the U-shaped structure, the adjusting device is located on the outside of the side wall, and the cutter head is located between the two side walls.

7. The machining tool according to claim 1, characterized in that, The tool holder is driven manually.

8. The machining tool according to claim 6, characterized in that, The guide section of the shouldered guide sleeve is clearance-fitted with the bushing, and the tool holder is slidingly fitted with the flange shoulder. The radial clearances between the guide section and the shaft hole, and between the tool holder and the flange shoulder, are configured to allow the shouldered guide sleeve to rotate circumferentially within the shaft hole and the tool holder to slide axially, while controlling the radial runout of the tool holder to within 0.01 mm.

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