A general measuring tool and measuring method for an aviation wheel

Abstract

The application discloses a general measuring tool and a measuring method for an aviation wheel, and belongs to the technical field of aviation wheels. A base is horizontally arranged at the bottom of the measuring tool, and a screw hole penetrating through the base is arranged at the convex part of the middle part of the base. Hollow straight cylindrical sleeve rods are symmetrically provided with external threads and internal grooves at both ends, the sleeve rods are perpendicular to the base, and the lower ends of the sleeve rods are screwed with the screw hole of the base. A grommet is coaxially sleeved on the lower end of the sleeve rod and is arranged on the base, a partition plate at the center of the through hole of the grommet is clamped in the internal groove of the lower end of the sleeve rod, and the partition plate is used for positioning a depth gauge during measurement. A nut is screwed on the upper end of the sleeve rod, a through groove is arranged in the threaded hole of the nut in the axial direction, and the depth gauge is avoided. When the measured wheel is installed on the measuring tool, the inner oil baffle ring is abutted against the upper end surface of the grommet, the outer oil baffle ring is abutted against the lower end surface of the nut, the nut cooperates with the grommet to form opposite extrusion contact of the inner and outer oil baffle rings, the gap between the oil baffle rings and the bearing in the free state is eliminated, and the axial distance between the inner and outer oil baffle rings can be accurately measured.

Description

Technical Field

[0001] This invention belongs to the field of aircraft wheel technology, specifically relating to a general measuring fixture and method for aircraft wheels. Background Technology

[0002] Aircraft wheels are mounted on the aircraft landing gear and are used for aircraft support, takeoff, landing, taxiing, and braking. Aircraft wheels mainly consist of components such as hubs, bearings, and oil retainer rings. During aircraft wheel assembly, the axle distance between the inner and outer oil retainer rings installed at both ends of the axial direction within the hub is the interface dimension. The tightening of the wheel axle nut must be determined based on this dimension to ensure the wheel's center of gravity is in the correct position. If this dimension deviates, the wheel axle nut may not be tightened properly, posing a risk of loosening and potentially causing the wheel to fall off the axle. Furthermore, deviations in this dimension will affect the wheel's center of gravity; even a small deviation, when accumulated, can cause a shift in the overall center of gravity of the aircraft.

[0003] Therefore, before installing the aircraft wheel, it is necessary to measure the shaft distance between the inner and outer oil baffle rings in each aircraft wheel assembly to obtain the shaft distance between the inner and outer oil baffle rings under operating conditions. However, the existing measurement method is performed when the aircraft wheel assembly is in a free state. When the bearings and oil baffle rings in the aircraft wheel assembly are in a free state, the contact surfaces of the oil baffle rings and bearings are not completely in contact. At this time, the measured value of the shaft distance between the inner and outer oil baffle rings is inaccurate, and dimensional deviations will occur.

[0004] Therefore, during aircraft wheel assembly, it is worthwhile to study how to accurately measure the axle distance between the inner and outer oil baffles of the aircraft wheel in its operating state, so as to avoid inadequate tightening of the wheel axle nuts and deviation of the wheel's center of gravity due to measurement deviations. Summary of the Invention

[0005] The technical problem to be solved:

[0006] To overcome the shortcomings of existing technologies, this invention provides a universal measuring fixture and method for aircraft wheels. The fixture uses a washer and a nut to create opposing compression contacts between the inner and outer oil baffle rings of the wheel assembly, eliminating the gap between the oil baffle rings and the bearing in the free state, thus achieving accurate measurement of the axial distance between the inner and outer oil baffle rings. This solves the problem of inaccurate measurement of the axial distance between the inner and outer oil baffle rings of the wheel assembly in the free state.

[0007] The technical solution of this invention is: a universal measuring fixture for aircraft wheels, comprising:

[0008] The base is horizontally positioned at the bottom of the measuring fixture, with its middle part protruding outwards. A threaded through hole that penetrates vertically through the base is located at the center of the protruding part.

[0009] The sleeve rod is a straight hollow rod with external threads at both ends. The sleeve rod is vertically installed on the base, and its lower end is screwed into the threaded through hole of the base. The sleeve rod has symmetrical inner grooves at both ends, which are located at the axis of the sleeve rod and divide the end of the sleeve rod into two annular parts.

[0010] A washer ring is coaxially fitted onto the lower end of the sleeve rod and placed on the through hole of the base; the washer ring has a through hole along its axial direction at its center, and the through hole is symmetrically divided into two circular through holes by a partition located at the center of the through hole, which are used to pass through the two circular cylinders at the lower end of the sleeve rod; the partition is used to position the depth caliper during measurement;

[0011] A nut is coaxially fitted onto the upper end of the sleeve rod and screwed into the external thread of the upper end of the sleeve rod; the threaded hole of the nut is provided with a through slot along the axial direction, which cooperates with the inner groove of the upper end of the sleeve rod to avoid the measuring base of the depth caliper.

[0012] When the wheel to be tested is installed on this measuring fixture, the inner oil baffle ring abuts against the upper end face of the washer ring, and the outer oil baffle ring abuts against the lower end face of the nut; the depth caliper is inserted into the sleeve rod to measure the axial distance from the inner oil baffle ring to the outer oil baffle ring.

[0013] A further technical solution of the present invention is: the base is a coaxial stepped disc, including a fixed disc at the bottom and a mounting disc above the fixed disc, forming a protruding part in the middle of the base; the threaded through hole of the base is located at the center of the mounting disc and passes through the base along its axis; multiple through holes are evenly distributed around the fixed disc for installing anchor bolts to fix the base.

[0014] A further technical solution of the present invention is: the main body of the gasket is a cylinder, the outer diameter of which is larger than the threaded through hole of the base and smaller than the outer diameter of the inner oil baffle ring; the lower end face of the gasket is in contact with the upper end face of the mounting plate; the partition plate of the gasket and the gasket are integral structures, and the upper end face of the partition plate is flush with the upper end face of the gasket as a whole.

[0015] A further technical solution of the present invention is: the groove width of the inner groove of the sleeve is greater than the width of the partition of the washer ring, and greater than the thickness of the depth caliper; the outer diameter of the sleeve is less than the diameter of the circle containing the two circular through holes of the washer ring.

[0016] A further technical solution of the present invention is as follows: the nut is an external hexagonal head nut, and a columnar boss is coaxially provided at the lower end of the nut. The lower end face of the boss is used to abut against the upper end face of the inner oil baffle ring; the slot is a straight hole, and the central axis of the slot coincides with the central axis of the internal thread hole of the nut; the width of the slot is consistent with the width of the groove in the sleeve rod.

[0017] A further technical solution of the present invention is that the base, sleeve, washer and nut are all machined from alloy steel.

[0018] A method for measuring the distance between the inner and outer oil baffle rings of an aircraft wheel using the aforementioned universal measuring fixture includes the following steps:

[0019] Step 1: Secure the base to the test platform using anchor bolts;

[0020] Step 2: Insert the washer ring into the lower end of the sleeve rod, and then screw the lower end of the sleeve rod into the threaded through hole of the base so that the lower end face of the washer ring contacts the upper end face of the base mounting plate.

[0021] Step 3: Coaxially mount the wheel assembly onto the measuring fixture, so that the lower end face of the inner oil baffle ring is in contact with the upper end face of the gasket ring at a horizontal level;

[0022] Step 4: Place the nut on the upper end of the sleeve rod and tighten the nut so that the lower end face of its boss presses against the upper end face of the outer oil baffle ring, so that the inner bearing and the inner oil baffle ring in the wheel assembly fit tightly together, the outer bearing and the outer oil baffle ring fit tightly together, and the slot of the nut is aligned with the inner groove at the upper end of the sleeve rod.

[0023] Step 5: Vertically insert the depth caliper into the inner hole of the sleeve, so that the lower end of the caliper body abuts against the upper surface of the partition plate of the washer ring; let the measuring base of the caliper enter through the slot of the nut and be locked on the upper surface of the outer oil baffle ring, thus completing the measurement of the axial distance between the inner and outer oil baffle rings.

[0024] A further technical solution of the present invention is: by adjusting the depth at which the lower end of the sleeve is screwed into the base, and in conjunction with adjusting the axial position of the threaded connection between the nut and the sleeve, it can be adapted to wheel assemblies with different axial width specifications.

[0025] Beneficial effects

[0026] The beneficial effects of this invention are as follows: This invention provides a universal aircraft wheel assembly. The wheel assembly is vertically mounted on the sleeve of a measuring fixture, with one end of the inner oil baffle ring facing downwards, placing the inner oil baffle ring on a washer ring. A nut applies downward pressure to the outer oil baffle ring, eliminating the gaps between the inner oil baffle ring and the inner bearing, and between the outer oil baffle ring and the outer bearing. Both the inner and outer bearings are in the operating condition with the wheel hub. Therefore, the accurate axial distance between the inner and outer oil baffle rings under operating conditions can be measured using a depth caliper.

[0027] This invention features a cleverly designed sleeve, washer, and nut structure that facilitates depth caliper measurements. The hollow, straight-cylinder sleeve allows the caliper to enter, and with the washer's partition design, the lower end of the caliper touches the upper surface of the partition, which corresponds to the lower end face of the inner oil baffle. The recessed design at the lower end of the sleeve ensures both passage through the washer and proper threaded connection with the base. The recessed design at the upper end of the sleeve, combined with the slotted design of the nut, allows the depth caliper's measuring base to enter the upper face of the outer oil baffle.

[0028] The measuring fixture of the present invention can accurately measure the shaft spacing between the inner and outer oil baffle rings of the aircraft wheel assembly in the use state, avoiding the wheel axle nut tightening state being inadequate due to inaccurate measurement values, and the deviation of the wheel center of gravity.

[0029] The measuring fixture of this invention is a general-purpose tool. By adjusting the depth of the sleeve screwed into the base and the axial installation position of the nut according to the width of different aircraft wheel assemblies, the usage requirements of different aircraft wheels can be met.

[0030] The measuring fixture of the present invention is easy to process and install. During use, only a general wrench is needed to operate the nut rotation. The installation and operation are simple, the matching requirements are low, and no special maintenance is required. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the universal measuring fixture for aircraft wheels of the present invention;

[0032] Figure 2 This is a schematic diagram of the sleeve shaft side structure in this invention;

[0033] Figure 3 This is a side view of the sleeve rod in this invention;

[0034] Figure 4 This is a schematic diagram of the nut axial side structure in this invention;

[0035] Figure 5 This is the front view of the nut in this invention;

[0036] Figure 6 This is a schematic diagram of the axial structure of the gasket ring in this invention;

[0037] Figure 7 This is a top view of the gasket ring in this invention;

[0038] Figure 8 This is a schematic diagram of the axial structure of the base in this invention;

[0039] Figure 9 This is the main view of the base in this invention;

[0040] Figure 10 This is a schematic diagram of the working state of the universal measuring tool for aircraft wheels of the present invention.

[0041] Explanation of reference numerals in the attached drawings: 1. Base, 11. Threaded through hole, 12. Fixing plate, 13. Mounting plate, 2. Sleeve rod, 21. Inner groove, 22. Partial annular column, 3. Washer ring, 31. Partial partition plate, 32. Partial circular through hole, 4. Nut, 41. Slot, 42. Boss, 5. Depth caliper, 51. Measuring base, 6. Wheel assembly, 61. Inner oil baffle ring, 62. Outer oil baffle ring, 63. Inner bearing, 64. Outer bearing, 65. Hub. Detailed Implementation

[0042] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] Example 1:

[0045] This embodiment provides a universal measuring fixture for aircraft wheels, used to measure the axial distance between the inner oil baffle ring 61 and the outer oil baffle ring 62 in the wheel assembly 6 under the condition of use.

[0046] See Figure 1 The general measuring fixture includes a base 1, a sleeve 2, a washer 3, a nut 4, and a depth caliper 5.

[0047] See Figure 1 , 8 9. The base 1 is an integral coaxial stepped disc, machined from alloy steel, and is horizontally placed at the bottom of the measuring fixture to support the remaining components of the measuring fixture. The base 1 includes a fixed disc 12 at its bottom and a mounting disc 13 above the fixed disc 12, forming a protruding part in the middle of the base 1. The fixed disc 12 and the mounting disc 13 are coaxial and have rounded corners. A threaded through hole 11 perpendicularly through the base 1 is provided at the center of the mounting disc 13 along its axis for threaded connection with the lower end of the sleeve rod 2. Six through holes are evenly distributed around the perimeter of the fixed disc 12 for anchor bolts to pass through and fix the base 1.

[0048] See Figure 1-3The sleeve rod 2 is a straight hollow rod with both ends symmetrical about the central structure. The sleeve rod 2 is machined from alloy steel, and both ends are threaded. The sleeve rod 2 is vertically mounted on the base 1, and its lower end threadedly engages with the threaded through hole 11 of the base 1. Both ends of the sleeve rod 2 have axially oriented grooves 21, which run radially through the sleeve rod 2. The geometric center of each groove is located at the axis of the sleeve rod 2, dividing the end of the sleeve rod 2 into two equal annular sections 22. The lower groove 21 of the sleeve rod 2 avoids the partition 31 of the washer ring 3, while the upper groove 21 avoids the measuring base 51 of the depth caliper 5. Therefore, the width of the inner groove at the lower end of the sleeve rod 2 should be greater than the width of the partition plate 31 of the washer ring 3, and the width of the inner groove at the upper end of the sleeve rod 2 should be greater than the thickness of the depth caliper 5. In order to facilitate installation, the inner grooves 21 at both ends of the sleeve rod have the same structure in this invention. Therefore, the groove width of the inner groove 21 is designed to be greater than the width of the partition plate 31 of the washer ring 3 and greater than the thickness of the depth caliper 5.

[0049] The reference Figure 1 , 6 7. The washer 3 is coaxially fitted onto the lower end of the sleeve rod 2 and horizontally placed on the through hole 11 of the base 1. The lower end face of the washer 3 contacts the upper end face of the mounting plate 13. The main body of the washer 3 is cylindrical, with an outer diameter larger than the threaded through hole of the base 1 but smaller than the outer diameter of the inner oil baffle ring 61 in the wheel assembly. The washer 3 is machined from alloy steel, with a through hole axially located at its center. The through hole is symmetrically divided into two circular through holes 32 by a partition 31 located at the center of the through hole. The two circular through holes 32 correspond to the two circular annular columns 22 at the lower end of the sleeve rod 2. When the washer 3 is fitted onto the sleeve rod 2, the two circular annular columns 22 at the lower end of the sleeve rod 2 pass through the two circular through holes 32 of the washer 3, clamping the partition 31 of the washer 3 between the two circular annular columns 22. The outer diameter of the sleeve rod 2 is smaller than the diameter of the circle containing the two circular through holes 32 of the washer 3 to ensure insertion and installation. The partition plate 31 of the pad ring 3 is an integral structure with the pad ring 3, and the upper end face of the partition plate 31 is flush with the upper end face of the pad ring 1. The partition plate 31 is used to position the lower end of the depth caliper 5 during measurement.

[0050] See Figure 1 , 45. Nut 4 is an external hexagonal head nut with a cylindrical boss 42 axially located on the lower end face. The threaded through hole of nut 4 passes through the cylindrical boss 42. Nut 4 is coaxially fitted onto the upper end of sleeve 2, and its internal threaded through hole is connected to the external thread of the upper end of sleeve 2. The lower end face of the boss of nut 4 abuts against the upper end face of the outer oil baffle ring 62. The threaded hole of nut 4 has an axially extending slot 41. The slot 41 is a straight hole, and its geometric center axis coincides with the center axis of the internal threaded hole of nut 4. The slot 41 mates with the inner groove 21 at the upper end of sleeve 2 to avoid the measuring base 51 of depth caliper 5, allowing the measuring base 51 to be locked onto the upper end face of outer oil baffle ring 62. The width of the slot 41 is the same as or greater than the width of the inner groove 21 of sleeve 2.

[0051] See Figure 10 When measuring and installing the wheel assembly 6 (including a hub 65, an inner bearing 63 and an outer bearing 64 installed in the hub 65, an inner oil baffle ring 61 located inside the inner bearing 63, and an outer oil baffle ring 62 located outside the outer bearing 64), the inner side of the wheel assembly 6 is facing downwards, and it is installed vertically on the measuring fixture. The lower end face of the inner oil baffle ring 61 of the wheel assembly 6 abuts against the upper end face of the washer 3, and the upper end face of the outer oil baffle ring 62 abuts against the lower end face of the lower boss 42 of the nut 4. The axial clearance is eliminated by tightening the nut 4. The depth caliper 5 is inserted into the center hole of the sleeve 2, and its end abuts against the partition 31 of the washer 3. Its measuring base 51 abuts against the upper end face of the outer oil baffle ring 62 through the slot 41 of the nut 4. The axial distance between the inner oil baffle ring 61 and the outer oil baffle ring 62 can be accurately measured when the wheel assembly 6 is in use.

[0052] This embodiment provides a set of specific measuring fixture dimensional parameters:

[0053] The fixed plate 12 at the lower end of the base 1 has a diameter of 500mm and an axial thickness of 20mm. It has 6 through holes with a diameter of 30mm evenly distributed. The boss of the base 1, i.e. the mounting plate 13, has a height of 65mm. A threaded through hole 11 is provided in the center of the boss along the axial direction. The internal thread specification of the threaded through hole 11 is M75, and the axial length is 85mm, which penetrates the base 1.

[0054] The sleeve rod 2 is 400mm long and 75mm in diameter. The diameter of the internal through hole is 45mm. The axial length of the inner grooves 21 at both ends is 150mm. M75 external threads are machined at both ends with a pitch of 1.5mm and an axial machining length of 160mm for the external threads.

[0055] The main ring of the washer 3 has a diameter of 100mm and an axial thickness of 25mm. The diameter of the two circular through holes 32 is 80mm.

[0056] Nut 4 is M75, 35mm thick, and the height of the lower boss 42 is 25mm. A slot 41 with dimensions of 120mm x 40mm is provided on the nut.

[0057] Example 2:

[0058] See Figure 10 This embodiment provides a method for measuring the distance between the inner and outer oil baffle ring shafts in a wheel assembly using the general-purpose aircraft wheel measuring fixture described in Embodiment 1. The specific steps are as follows:

[0059] Step 1: Fix the base 1 to the test platform with anchor bolts. The six anchor bolts pass through the six through holes of the fixing plate 12 and are fixedly connected to the test platform. Keep the base 1 horizontal during installation.

[0060] Step 2: Insert the washer 3 onto the lower end of the sleeve rod 2, so that the two circular cylindrical parts 22 at the lower end of the sleeve rod 2 pass through the two circular through holes 32 of the washer 3. Then screw the lower end of the sleeve rod 2 into the threaded through hole 11 of the base 1. The screwing depth is determined according to the axial width specification of the wheel assembly 6. The external thread at the lower end of the sleeve rod 2 is located on the outer diameter wall of the two circular cylindrical parts 22. During the rotation of the sleeve rod 2, the washer 3 will rotate accordingly. After the sleeve rod 2 is installed in place, the washer 3 is in a horizontal state, and its lower end face is in contact with the upper end face of the mounting plate 13 of the base 1.

[0061] Step 3: Place the inner end of the wheel assembly 6 downwards and the outer end upwards, and vertically coaxially mount it onto the measuring fixture, so that the lower end face of the inner oil baffle ring 61 of the wheel assembly 6 contacts the upper end face of the washer ring 3 horizontally. At this time, under the action of gravity of the wheel assembly 6, the inner bearing 63 and the inner oil baffle ring 61 are initially pressed together, and the inner edge of the hub 65 is in a suspended state.

[0062] Step 4: Fit nut 4 onto the upper end of sleeve rod 2 and tighten nut 4 so that the columnar boss 42 on its lower end face presses against the outer oil baffle ring 62. The lower end face of the columnar boss 42 abuts against the upper end face of the outer oil baffle ring 62, making the inner bearing 63 and the inner oil baffle ring 61 in the wheel assembly fit tightly together. The inner bearing 63 fits tightly against the wheel hub 65, and the outer bearing 64 fits tightly against the outer oil baffle ring 62. The outer bearing 64 fits tightly against the wheel hub 65, eliminating the free gap between the two oil baffle rings in the free state of the wheel assembly 6, thus simulating the actual installation conditions of the wheel assembly 6 in use. At the same time, adjust nut 4 or sleeve rod 2 so that the slot 41 of nut 4 is aligned with the inner groove 21 at the upper end of sleeve rod 2, making it easy to insert the depth caliper 5.

[0063] Step 5: Vertically insert the depth caliper 5 into the inner hole of the sleeve rod 2, so that the lower end of the caliper 5 abuts against the upper end face of the partition plate 31 of the washer ring 3. Then, allow the measuring base 51 of the caliper 5 to enter through the slot 41 of the nut 4 and engage with the upper end face of the outer oil baffle ring 62, thus completing the measurement of the axial distance between the inner oil baffle ring 61 and the outer oil baffle ring 62.

[0064] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A universal measuring fixture for aircraft wheels, characterized in that, include: The base is horizontally positioned at the bottom of the measuring fixture, with its middle part protruding outwards. A threaded through hole that penetrates vertically through the base is located at the center of the protruding part. The sleeve rod is a straight hollow rod with external threads at both ends. The sleeve rod is vertically installed on the base, and its lower end is screwed into the threaded through hole of the base. The sleeve rod has symmetrical inner grooves at both ends, which are located at the axis of the sleeve rod and divide the end of the sleeve rod into two annular parts. A washer ring is coaxially fitted onto the lower end of the sleeve rod and placed on the through hole of the base; the washer ring has a through hole along its axial direction at its center, and the through hole is symmetrically divided into two circular through holes by a partition located at the center of the through hole, which are used to pass through the two circular cylinders at the lower end of the sleeve rod; the partition is used to position the depth caliper during measurement; A nut is coaxially fitted onto the upper end of the sleeve rod and screwed into the external thread of the upper end of the sleeve rod; the threaded hole of the nut is provided with a through slot along the axial direction, which cooperates with the inner groove of the upper end of the sleeve rod to avoid the measuring base of the depth caliper. When the wheel assembly to be tested is installed in this measuring fixture, the inner oil baffle ring abuts against the upper end face of the washer ring, and the outer oil baffle ring abuts against the lower end face of the nut; the depth caliper is inserted into the sleeve rod to measure the axial distance from the inner oil baffle ring to the outer oil baffle ring.

2. The universal measuring fixture for aircraft wheels according to claim 1, characterized in that, The base is a coaxial stepped disc, including a fixed disc at the bottom and a mounting disc above the fixed disc, forming a protruding part in the middle of the base; the threaded through hole of the base is located at the center of the mounting disc and passes through the base along its axis; the fixed disc has multiple through holes evenly distributed around its perimeter for installing anchor bolts to fix the base.

3. The universal measuring fixture for aircraft wheels according to claim 2, characterized in that, The main body of the gasket is a cylinder, with an outer diameter larger than the threaded through hole of the base and smaller than the outer diameter of the inner oil baffle ring; the lower end face of the gasket contacts the upper end face of the mounting plate; the partition plate of the gasket is an integral structure with the gasket, and the upper end face of the partition plate is flush with the upper end face of the gasket as a whole.

4. The universal measuring fixture for aircraft wheels according to claim 3, characterized in that, The groove width of the inner groove of the sleeve is greater than the width of the partition of the washer and greater than the thickness of the depth caliper; the outer diameter of the sleeve is less than the diameter of the circle containing the two circular through holes of the washer.

5. The universal measuring fixture for aircraft wheels according to claim 4, characterized in that, The nut is an external hexagonal head nut, with a columnar boss coaxially provided at the lower end of the nut. The lower end face of the boss is used to abut against the upper end face of the outer oil baffle ring. The slot is a straight hole, and the central axis of the slot coincides with the central axis of the internal thread hole of the nut. The width of the slot is consistent with the width of the groove in the sleeve rod.

6. The universal measuring fixture for aircraft wheels according to claim 5, characterized in that, The base, sleeve, washer, and nut are all machined from alloy steel.

7. A method for measuring the distance between the inner and outer oil baffle rings of an aircraft wheel using the universal measuring fixture of claim 6, characterized in that, Includes the following steps: Step 1: Secure the base to the test platform using anchor bolts; Step 2: Insert the washer ring into the lower end of the sleeve rod, and then screw the lower end of the sleeve rod into the threaded through hole of the base so that the lower end face of the washer ring contacts the upper end face of the base mounting plate. Step 3: Coaxially mount the wheel assembly onto the measuring fixture, so that the lower end face of the inner oil baffle ring is in contact with the upper end face of the gasket ring at a horizontal level; Step 4: Place the nut on the upper end of the sleeve rod and tighten the nut so that the lower end face of its boss presses against the upper end face of the outer oil baffle ring, so that the inner bearing and the inner oil baffle ring in the wheel assembly fit tightly together, the outer bearing and the outer oil baffle ring fit tightly together, and the slot of the nut is aligned with the inner groove at the upper end of the sleeve rod. Step 5: Vertically insert the depth caliper into the inner hole of the sleeve, so that the lower end of the caliper body abuts against the upper surface of the partition plate of the washer ring; let the measuring base of the caliper enter through the slot of the nut and be locked on the upper surface of the outer oil baffle ring, thus completing the measurement of the axial distance between the inner and outer oil baffle rings.

8. The method according to claim 7, characterized in that, By adjusting the depth at which the lower end of the sleeve is screwed into the base, and in conjunction with adjusting the axial position of the threaded connection between the nut and the sleeve, it can be adapted to wheel assemblies with different axial width specifications.

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