General measurement tool and measurement method for aviation aircraft wheel

Abstract

The invention discloses a general measurement tool and a measurement method for aviation aircraft wheels, and belongs to the technical field of aviation aircraft wheels. The base is horizontally arranged at the bottom of the measuring tool, and a screw hole vertically penetrating through the base is formed in the middle protruding position of the base. The sleeve rod is perpendicular to the base, and the lower end of the sleeve rod is in threaded connection with the screw hole of the base. The backing ring coaxially sleeves the lower end of the sleeve rod and is arranged on the base, and the partition plate in the center of the through hole of the backing ring is clamped in the inner groove in the lower end of the sleeve rod and used for positioning the depth caliper during measurement. The nut is in threaded connection with the upper end of the sleeve rod, and a slotted hole penetrating through the axial direction is formed in a threaded hole of the nut to avoid the depth caliper. When an airplane wheel to be measured is installed on the measuring tool, the inner oil retainer abuts against the upper end face of the backing ring, the outer oil retainer abuts against the lower end face of the nut, the nut is matched with the backing ring to form opposite extrusion contact on the inner oil retainer and the outer oil retainer, gaps between the oil retainers and a bearing in a free state are eliminated, and the axial distance between the inner oil retainer and the outer oil retainer is accurately measured.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft wheels, and in particular relates to a universal measuring tool and a measuring method for aircraft wheels. Background Art

[0002] Aircraft wheels are installed on the aircraft landing gear and are used for aircraft support, takeoff, landing, taxiing and braking. Aircraft wheels are mainly composed of hubs, bearings, oil retaining rings and other components. During the assembly of aircraft wheels, the axial spacing between the inner and outer oil retaining rings installed at both ends of the inner axial direction of the hub is the interface size. The tightening state of the axle nut needs to be determined based on this size to ensure the center of gravity position of the wheel. If there is a deviation in this dimension, the axle nut may not be tightened in place, and there is a risk of loosening, which may cause the wheel to fall off the axle. In addition, deviations in this dimension will affect the center of gravity of the wheel. Even a slight deviation will cause a deviation in the center of gravity of the entire aircraft due to the cumulative effect of the center of gravity deviation.

[0003] Therefore, before installing the wheel, it is necessary to measure the axial spacing between the inner and outer oil retaining rings in each set of aircraft wheel assemblies to obtain the axial spacing between the inner and outer oil retaining rings when in use. However, the existing measurement method is performed when the wheel assembly is in a free state. When the bearings, oil retaining rings, etc. in the aircraft wheel assembly are in a free state, the contact surface between the oil retaining ring and the bearing is not completely fitted. At this time, the measurement value of the axial spacing between the inner and outer oil retaining rings is inaccurate, and the dimensional tolerance phenomenon will occur.

[0004] Therefore, when assembling aircraft wheels, it is worth studying how to accurately measure the axial spacing between the inner and outer oil retaining rings of the aircraft wheels when in use, so as to avoid the axle nut being not properly tightened and the center of gravity of the wheel being deviated due to measurement value deviation. Summary of the invention

[0005] Technical issues to be solved:

[0006] In order to avoid the shortcomings of the prior art, the present invention provides a universal measuring tool and a measuring method for aircraft wheels, wherein the inner and outer oil retaining rings in the wheel assembly are respectively pressed into contact with each other by the backing ring and the nut in the tool, thereby eliminating the gap between the oil retaining ring and the bearing in a free state, and accurately measuring the axial spacing between the inner and outer oil retaining rings. The problem of inaccurate measurement of the axial spacing between the inner and outer oil retaining rings in the free state of the wheel assembly is solved.

[0007] The technical solution of the present invention is: a universal measuring tool for aircraft wheels, comprising:

[0008] The base is horizontally arranged at the bottom of the measuring tool, the middle part of which is convex, and a threaded through hole vertically penetrating the base is arranged at the center of the convex 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 to the threaded through hole of the base. Both ends of the sleeve rod are symmetrical and have inner grooves along the axial direction. The inner grooves are located at the axis of the sleeve rod, dividing the end of the sleeve rod into two circular columns.

[0010] The gasket is coaxially sleeved on the lower end of the sleeve rod and placed on the through hole of the base; a through hole is provided in the center of the gasket along its axial direction, and the through hole is symmetrically divided into two partial circular through holes by a partition located in the center of the through hole, which are used to correspond to the two partial circular ring columns passing through the lower end of the sleeve rod; the partition is used to position the depth caliper during measurement;

[0011] The nut is coaxially sleeved on the upper end of the sleeve rod and is threadedly connected with the external thread on the upper end of the sleeve rod; a through slot is axially arranged in the threaded hole of the nut, and the slot cooperates with the inner groove on the upper end of the sleeve rod to avoid the measuring base of the depth caliper;

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

[0013] A further technical solution of the present invention is: the base is a coaxial stepped disc, including a fixed disc located at the bottom and a mounting disc located above the fixed disc and forming an outer convex portion 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; a plurality of 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 retaining ring; the lower end face of the gasket is in contact with the upper end face of the mounting plate; the partition of the gasket and the gasket are an integral structure, and the upper end face of the partition is flush with the upper end face of the gasket as a whole.

[0015] A further technical solution of the present invention is that the groove width of the groove in the sleeve rod is greater than the partition width of the gasket and greater than the thickness of the depth caliper; the outer diameter of the sleeve rod is smaller than the diameter of the circle where the two partially circular through holes of the gasket are located.

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

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

[0018] A method for measuring the distance between inner and outer oil deflector rings of an aircraft wheel using the universal measuring tool for aircraft wheels comprises the following steps:

[0019] Step 1: Fix the base to the test platform with anchor bolts;

[0020] Step 2: Install the gasket ring on 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 surface of the gasket ring is in horizontal contact with the upper end surface of the base mounting plate;

[0021] Step 3, coaxially mount the wheel assembly on the measuring fixture, so that the lower end surface of the inner oil retaining ring is in horizontal contact with the upper end surface of the backing ring;

[0022] Step 4: Put the nut on the upper end of the sleeve rod, and screw the nut so that the lower end surface of the boss squeezes the upper end surface of the outer oil retaining ring, so that the inner bearing and the inner oil retaining ring in the wheel assembly fit tightly, the outer bearing and the outer oil retaining ring fit tightly, and the slot of the nut is aligned with the inner groove at the upper end of the sleeve rod;

[0023] Step 5. Insert the depth caliper vertically into the inner hole of the sleeve rod so that the lower end of the caliper body abuts against the upper end surface of the partition of the gasket ring; make the measuring base of the caliper enter through the slot of the nut and clamp on the upper end surface of the outer oil retaining ring to complete the measurement of the axial distance between the inner oil retaining ring and the outer oil retaining ring.

[0024] A further technical solution of the present invention is: by adjusting the depth of the lower end of the sleeve rod being screwed into the base, the axial position of the threaded connection between the nut and the sleeve rod is adjusted to adapt to wheel assemblies with different axial width specifications.

[0025] Beneficial Effects

[0026] The beneficial effects of the present invention are as follows: the present invention is universal for aircraft wheels, the wheel assembly is vertically mounted on the outside of the sleeve rod of the measuring tool, one end of the inner oil retaining ring of the wheel assembly is downward, and the inner oil retaining ring is placed on the gasket. The outer oil retaining ring is squeezed downward by the nut to eliminate the gap between the inner oil retaining ring and the inner bearing, and the gap between the outer oil retaining ring and the outer bearing, and the inner bearing and the outer bearing are both in a matching state with the wheel hub under the use condition. Therefore, the axial distance from the inner oil retaining ring to the outer oil retaining ring under the use condition can be accurately measured by the depth caliper.

[0027] The present invention cleverly designs the matching structure of the sleeve rod, gasket and nut to facilitate the measurement of the depth caliper. The sleeve rod with a hollow straight tube structure can realize the entry of the depth caliper. With the partition design of the gasket, the lower end of the ruler touches the upper surface of the partition, which is the position of the lower end face of the inner oil retaining ring. The inner groove design at the lower end of the sleeve rod can ensure that the gasket is passed through and the normal threaded connection with the base is ensured. The inner groove design at the upper end of the sleeve rod cooperates with the I-shaped slot design of the nut to meet the measurement base of the depth caliper entering the upper end face of the outer oil retaining ring.

[0028] The measuring tool of the present invention can accurately measure the axial distance between the inner and outer oil retaining rings of an aircraft wheel assembly when in use, thereby avoiding the inadequate tightening state of the axle nut and the deviation of the wheel center of gravity due to inaccurate measurement values.

[0029] The measuring tool of the present invention is a universal tool, and can meet the use requirements of different aircraft wheels by adjusting the depth of the sleeve rod screwed into the base and the axial installation position of the nut according to the width of different aircraft wheel assemblies.

[0030] The measuring tool of the present invention is easy to process and install. During use, only a universal wrench is needed to operate the nut to rotate. The installation operation is simple and convenient, the matching requirements are low, and no special maintenance requirements are required. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0032] Figure 2 It is a schematic diagram of the shaft side structure of the sleeve rod in the present invention;

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

[0034] Figure 4 It is a schematic diagram of the nut shaft side structure in the present invention;

[0035] Figure 5 It is the front view of the nut in the present invention;

[0036] Figure 6 It is a schematic diagram of the axial side structure of the gasket ring in the present invention;

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

[0038] Figure 8 It is a schematic diagram of the axial side structure of the base in the present invention;

[0039] Fig. 9 It is a front view of the base in the present invention;

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

[0041] Explanation of the reference numerals: 1. base, 11. threaded through hole, 12. fixing plate, 13. mounting plate, 2. sleeve rod, 21. inner groove, 22. part of circular ring column, 3. gasket, 31. partition, 32. part of circular through hole, 4. nut, 41. slot, 42. boss, 5. depth caliper, 51. measuring base, 6. wheel assembly, 61. inner oil retaining ring, 62. outer oil retaining ring, 63. inner bearing, 64. outer bearing, 65. wheel hub. DETAILED DESCRIPTION

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

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] Embodiment 1:

[0045] This embodiment provides a universal measuring tool for aircraft wheels, which is used to measure the axial distance between the inner oil retainer ring 61 and the outer oil retainer ring 62 in the wheel assembly 6 when in use.

[0046] See also Figure 1 The universal measuring tool comprises a base 1, a sleeve rod 2, a washer 3, a nut 4 and a depth caliper 5.

[0047] See also Figure 1 , 8 9. The base 1 is an integral coaxial stepped disc, which is made of alloy steel machined and horizontally placed at the bottom of the measuring tool to support and install the remaining components of the measuring tool. The base 1 includes a fixed plate 12 located at the bottom thereof and a mounting plate 13 located above the fixed plate 12 and forming the outer convex part of the middle part of the base 1. The fixed plate 12 and the mounting plate 13 are coaxial and have rounded transitions. A threaded through hole 11 is provided at the center position of the mounting plate 13 along its axis, which is vertically penetrated through the base 1 and is used for threaded connection with the lower end of the sleeve rod 2. Six through holes are evenly distributed around the circumference of the fixed plate 12, which are used to pass anchor bolts to fix the base 1.

[0048] See also Figure 1-3, the sleeve rod 2 is a straight hollow rod, and its two ends are symmetrical relative to the central structure. The sleeve rod 2 is made of alloy steel machined, and both ends are provided with external threads. The sleeve rod 2 is vertically installed on the base 1, and the external thread at the lower end is threadedly connected with the threaded through hole 11 of the base 1. Both ends of the sleeve rod 2 are provided with inner grooves 21 along the axial direction, and the inner groove 21 runs through the radial direction of the sleeve rod 2, and its geometric center is located at the axis position of the sleeve rod 2, dividing the end of the sleeve rod 2 into two partial circular columns 22. The inner groove 21 at the lower end of the sleeve rod 2 is used to avoid the partition 31 of the gasket 3, and the inner groove 21 at the upper end of the sleeve rod 2 is used to avoid 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 is greater than the width of the partition 31 of the gasket 3, and the width of the inner groove at the upper end of the sleeve rod 2 is 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 in the present invention have the same structure. Therefore, the width of the inner groove 21 is designed to be greater than the width of the partition 31 of the gasket 3 and greater than the thickness of the depth caliper 5.

[0049] The reference Figure 1 , 6 7. The backing ring 3 is coaxially sleeved on the lower end of the sleeve rod 2 and horizontally placed on the through hole 11 of the base 1. The lower end surface of the backing ring 3 contacts the upper end surface of the mounting plate 13. The main body of the backing ring 3 is a cylinder, and its outer diameter is larger than the threaded through hole of the base 1 and smaller than the outer diameter of the inner oil retaining ring 61 in the wheel assembly. The backing ring 3 is made of alloy steel machined, and a through hole is provided in the axial direction at the center thereof, and the through hole is symmetrically divided into two partial circular through holes 32 by a partition 31 located at the center of the through hole. The two partial circular through holes 32 correspond to the two partial circular ring columns 22 at the lower end of the sleeve rod 2. When the backing ring 3 is sleeved on the sleeve rod 2, the two partial circular ring columns 22 at the lower end of the sleeve rod 2 pass through the two partial circular through holes 32 of the backing ring 3, and the partition 31 of the backing ring 3 is clamped between the two partial circular ring columns 22. The outer diameter of the sleeve rod 2 is smaller than the diameter of the circle where the two partial circular through holes 32 of the backing ring 3 are located, so as to ensure that it can be inserted and installed. The partition plate 31 of the gasket 3 is an integral structure with the gasket 3, and the upper end surface of the partition plate 31 is flush with the upper end surface of the gasket 1 as a whole. The partition plate 31 is used to position the lower end of the ruler body of the depth caliper 5 during measurement.

[0050] See also Figure 1 , 45. The nut 4 is an external hexagonal head nut, and a cylindrical boss 42 is axially provided in the middle of its lower end face, and the threaded through hole of the nut 4 passes through the cylindrical boss 42. The nut 4 is coaxially sleeved on the upper end of the sleeve rod 2, and its internal threaded through hole is matched and connected with the external thread of the upper end of the sleeve rod 2, and the lower end face of the boss of the nut 4 is used to abut against the upper end face of the outer oil retaining ring 62. A through slot 41 is axially provided in the threaded hole of the nut 4, and the slot 41 is a straight hole, and the geometric center axis of the slot 41 coincides with the center axis of the internal threaded hole of the nut 4. The slot 41 cooperates with the inner groove 21 at the upper end of the sleeve rod 2 to avoid the measuring base 51 of the depth caliper 5, so that the measuring base 51 can be stuck on the upper end face of the outer oil retaining ring 62. The slot width of the slot 41 is consistent with the slot width of the inner groove 21 of the sleeve rod 2, or is greater than the slot width of the inner groove 21.

[0051] See also Fig.10 When measuring and installing the wheel assembly 6 to be measured (including the hub 65, the inner bearing 63 and the outer bearing 64 installed in the hub 65, the inner oil retaining ring 61 located on the inner side of the inner bearing 63 and the outer oil retaining ring 62 located on the outer side of the outer bearing 64), the inner side of the wheel assembly 6 to be measured is downward and vertically installed on the measuring fixture, the lower end face of the inner oil retaining ring 61 of the wheel assembly 6 abuts against the upper end face of the gasket 3, and the upper end face of the outer oil retaining ring 62 abuts against the lower end face of the lower end boss 42 of the nut 4, and the axial clearance is eliminated by pressing the nut 4. The depth caliper 5 is inserted into the center hole of the sleeve rod 2, and the end of the ruler body abuts against the partition 31 of the gasket 3, and the measuring base 51 abuts against the upper end face of the outer oil retaining ring 62 at the slot 41 of the nut 4, so that the axial distance from the inner oil retaining ring 61 to the outer oil retaining ring 62 in the use state of the wheel assembly 6 can be accurately measured.

[0052] This embodiment provides a set of specific measurement tool size parameters:

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

[0054] The length of the sleeve rod 2 is 400mm, the diameter is 75mm, the diameter of the internal through hole is 45mm, the axial length of the inner grooves 21 at both ends is 150mm, both ends are processed with M75 external threads, the pitch is 1.5mm, and the axial processing length of the external threads is 160mm.

[0055] The main body of the gasket ring 3 has a diameter of 100 mm and an axial thickness of 25 mm. The diameter of the circle where the two partially circular through holes 32 are located is 80 mm.

[0056] The specification of the nut 4 is M75, the thickness is 35mm, and the height of the boss 42 at the lower end of the nut 4 is 25mm. A slot 41 with a length*width of 120*40mm is arranged on the nut.

[0057] Embodiment 2:

[0058] See also Fig.10 This embodiment provides a method for measuring the distance between the inner and outer oil retainer rings in a wheel assembly by using the universal aircraft wheel measuring tool in Embodiment 1. The specific steps are as follows:

[0059] Step 1: Fix the base 1 to the test platform through 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, install the gasket 3 on the lower end of the sleeve rod 2, so that the two partial circular columns 22 at the lower end of the sleeve rod 2 correspond to the two partial circular through holes 32 of the gasket 3; then screw the lower end of the sleeve rod 2 into the threaded through hole 11 of the base 1, and 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 partial circular columns 22, and the gasket 3 will rotate with it during the rotation of the sleeve rod 2. After the sleeve rod 2 is installed in place, the gasket 3 is in a horizontal state, and its lower end surface contacts the upper end surface of the mounting plate 13 of the base 1.

[0061] Step 3: Put the inner end of the wheel assembly 6 downward and the outer end upward, and vertically and coaxially fit it on the measuring fixture, so that the lower end surface of the inner oil retaining ring 61 of the wheel assembly 6 is in horizontal contact with the upper end surface of the backing ring 3. At this time, under the gravity of the wheel assembly 6, the inner bearing 63 and the inner oil retaining ring 61 are initially pressed, and the inner end edge of the hub 65 is in a suspended state.

[0062] Step 4, put the nut 4 on the upper end of the sleeve rod 2, and screw the nut 4 so that the columnar boss 42 on the lower end face squeezes the outer oil retaining ring 62, and the lower end face of the columnar boss 42 abuts against the upper end face of the outer oil retaining ring 62, so that the inner bearing 63 and the inner oil retaining ring 61 in the wheel assembly are closely fitted, the inner bearing 63 and the wheel hub 65 are closely fitted, the outer bearing 64 and the outer oil retaining ring 62 are closely fitted, and the outer bearing 64 and the wheel hub 65 are closely fitted, eliminating the free gap between the two oil retaining rings in the axial direction when the wheel assembly 6 is in a free state, thereby simulating the actual installation condition of the wheel assembly 6 in the use state. At the same time, adjust the nut 4 or the sleeve rod 2 so that the slot 41 of the nut 4 is aligned with the inner groove 21 at the upper end of the sleeve rod 2, so as to facilitate the insertion and use of 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 surface of the partition 31 of the gasket 3. Make the measuring base 51 of the caliper 5 enter through the slot 41 of the nut 4 and clamp on the upper end surface of the outer oil retaining ring 62, and complete the measurement of the axial distance between the inner oil retaining ring 61 and the outer oil retaining ring 62.

[0064] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A universal measuring tool for aircraft wheels, characterized in that: include: The base is horizontally arranged at the bottom of the measuring tool, the middle part of which is convex, and a threaded through hole vertically penetrating the base is arranged at the center of the convex 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 to the threaded through hole of the base. Both ends of the sleeve rod are symmetrical and have inner grooves along the axial direction. The inner grooves are located at the axis of the sleeve rod, dividing the end of the sleeve rod into two circular columns. The gasket is coaxially sleeved on the lower end of the sleeve rod and placed on the through hole of the base; a through hole is provided in the center of the gasket along its axial direction, and the through hole is symmetrically divided into two partial circular through holes by a partition located in the center of the through hole, which are used to correspond to the two partial circular ring columns passing through the lower end of the sleeve rod; the partition is used to position the depth caliper during measurement; The nut is coaxially sleeved on the upper end of the sleeve rod and is threadedly connected with the external thread on the upper end of the sleeve rod; a through slot is axially arranged in the threaded hole of the nut, and the slot cooperates with the inner groove on the upper end of the sleeve rod to avoid the measuring base of the depth caliper; When the wheel assembly to be measured is installed on the measuring fixture, the inner oil retaining ring abuts against the upper end surface of the gasket, and the outer oil retaining ring abuts against the lower end surface of the nut; the depth caliper is inserted into the sleeve rod to measure the axial distance from the inner oil retaining ring to the outer oil retaining ring.

2. The universal measuring tool 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 located above the fixed disc and forming an outer convex portion 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; a plurality of through holes are evenly distributed around the fixed disc for installing anchor bolts to fix the base.

3. The universal measuring tool for aircraft wheels according to claim 2, characterized in that: 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 retaining ring; the lower end face of the gasket contacts the upper end face of the mounting plate; the partition of the gasket and the gasket are an integral structure, and the upper end face of the partition is flush with the upper end face of the gasket as a whole.

4. The universal aircraft wheel measuring tool according to claim 3 is characterized in that: The width of the inner groove of the sleeve rod is greater than the width of the partition of the gasket ring and greater than the thickness of the depth caliper; the outer diameter of the sleeve rod is smaller than the diameter of the circle where the two partially circular through holes of the gasket ring are located.

5. The universal aircraft wheel measuring tool according to claim 4, characterized in that: The nut is an external hexagonal head nut, and a columnar boss is coaxially provided at the lower end of the nut, and the lower end surface of the boss is used to abut against the upper end surface of the outer oil retaining ring; the slot hole is a straight hole, and the central axis of the slot hole coincides with the central axis of the internal threaded hole of the nut; the slot width of the slot hole is consistent with the slot width of the groove in the sleeve rod.

6. The universal aircraft wheel measuring tool according to claim 5, characterized in that: The base, sleeve rod, washer and nut are all made of alloy steel by machining.

7. A method for measuring the distance between the inner and outer oil retainer rings of an aircraft wheel using the universal aircraft wheel measuring tool as claimed in claim 6, characterized in that: The following steps are involved: Step 1: Fix the base to the test platform with anchor bolts; Step 2: Install the gasket ring on 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 surface of the gasket ring is in horizontal contact with the upper end surface of the base mounting plate; Step 3, coaxially mount the wheel assembly on the measuring fixture, so that the lower end surface of the inner oil retaining ring is in horizontal contact with the upper end surface of the backing ring; Step 4: Put the nut on the upper end of the sleeve rod, and screw the nut so that the lower end surface of the boss squeezes the upper end surface of the outer oil retaining ring, so that the inner bearing and the inner oil retaining ring in the wheel assembly fit tightly, the outer bearing and the outer oil retaining ring fit tightly, and the slot of the nut is aligned with the inner groove at the upper end of the sleeve rod; Step 5. Insert the depth caliper vertically into the inner hole of the sleeve rod so that the lower end of the caliper body abuts against the upper end surface of the partition of the gasket ring; make the measuring base of the caliper enter through the slot of the nut and clamp on the upper end surface of the outer oil retaining ring to complete the measurement of the axial spacing between the inner oil retaining ring and the outer oil retaining ring.

8. The method according to claim 7, characterized in that By adjusting the depth of the lower end of the sleeve rod being screwed into the base, the axial position of the threaded connection between the nut and the sleeve rod is adjusted to adapt to wheel assemblies with different axial width specifications.

Images