A crawler-type test device and test method for heavy-load rolling test of a wheel

Abstract

This application provides a tracked testing device and method for heavy-load roll tests of machine wheels. In this device, the drive wheel provides power for track rotation and supports the track through a load-bearing axle assembly. The staggered load-bearing rollers in the load-bearing axle assembly ensure that each track plate is kept in the same plane, thereby keeping the contact surface between the test wheel and the track always on the same plane, achieving the purpose of simulating real ground, reducing the deformation of the test wheel tire, and reducing heat generation. At the same time, since the load-bearing rollers rotate with the track, they do not rub against the track. While providing support, the two do not interfere with each other. Therefore, the testing device of this application can obtain accurate and realistic heavy-load roll test data of machine wheels.

Description

Technical Field

[0001] This invention belongs to the field of heavy-load aircraft wheel testing technology, specifically relating to a tracked testing device and testing method for heavy-load rolling tests of aircraft wheels. Background Technology

[0002] To assess the lifespan of aircraft wheels, the wheel under test is mounted on a fatigue testing bench for a fatigue rolling test. The fatigue testing bench is typically controlled by a control system that drives a motor to rotate a large steel drum. The wheel under test is subjected to a certain load and is pressed vertically onto the curved surface of the drum, rotating with the drum under the action of friction. This test simulates the rolling process of the wheel on a horizontal surface. The fatigue life of the wheel is assessed based on the magnitude of the load applied to the wheel and the actual rolling distance.

[0003] In the traditional test benches described above, the curved surface of the drum is used to simulate a horizontal ground. Although the structure is simple, the steel drum has high hardness and a certain curvature. Under pressure, the contact surface between the tire and the drum will form a curved shape. It's important to note that the contact surface is not simply compressed into a flat plane, but rather undergoes inward deformation towards the tire's axis. Heavy-duty tires repeatedly experience this massive deformation during rolling. The tire converts the mechanical energy of this deformation into heat energy, causing a rapid increase in the temperature of the tire itself and the gas inside. Therefore, the test cannot be conducted for extended periods. Furthermore, the heating on the drum is more severe than on an airport runway surface, resulting in discrepancies between the test data obtained on the drum and the data obtained under actual operating conditions on an airport runway surface.

[0004] Therefore, this application provides a wheel heavy-load roll test device that can simulate real ground. Summary of the Invention

[0005] To address the technical problems of inaccurate wheel roll test data and significant tire overheating in existing technologies, this application provides a tracked testing device and method for wheel roll tests under heavy loads.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] In a first aspect, embodiments of this disclosure provide a tracked testing device for heavy-load rolling tests of machine wheels, including a driving wheel and a driven wheel, and a track sleeved on the driving wheel and the driven wheel to form a circular loop, wherein a load-bearing axle assembly is provided at the bottom of the track between the driving wheel and the driven wheel for supporting the machine wheel to be tested;

[0008] The load-bearing shaft assembly is attached to the lower surface of the track via a fixing frame. The load-bearing shaft assembly includes two support frames and multiple load-bearing shafts that are fixedly arranged in parallel between the two support frames. A matching gear that meshes with the edge of the track is fixedly sleeved on any end of the load-bearing shaft, and the matching gears of adjacent load-bearing shafts are staggered. Multiple load-bearing rollers are rotatably sleeved on the shaft body of the load-bearing shaft at intervals, and the load-bearing rollers of adjacent load-bearing shafts are staggered.

[0009] Furthermore, both the driving wheel and the driven wheel include two wheel pieces, with an axle connecting the wheel pieces, and the edges of the wheel pieces are provided with teeth that mesh with the track;

[0010] The driven wheel's axle is connected to the moving end of a tensioning hydraulic cylinder, and the fixed end of the tensioning hydraulic cylinder is connected to a fixed frame. A slide rail assembly is provided at the wheel axle of the driven wheel. The slide rail assembly includes a slide rail frame fixedly connected to the fixed frame, and a slider slidably set on the slide rail frame. The slider is fixedly connected to the wheel axle of the driven wheel.

[0011] Furthermore, the track includes multiple track plates connected end to end, the edges of adjacent track plates are connected by connecting buckles, and connecting nails are fixedly provided along the length of the edge of the track plate, with the connecting nails and connecting buckles being inserted into each other.

[0012] The adjacent sides of the track plates are provided with curved mating surfaces of the same shape, and the adjacent sides of the adjacent track plates are fitted together by the curved mating surfaces.

[0013] The inner wall of the track plate along the width is provided with track teeth, which are used to mesh with the teeth of the drive wheel and the driven wheel.

[0014] Furthermore, the line connecting the rotation axes of the two connecting pins on the track plate serves as the meshing line of the track plate's curved mating surface. The area of ​​the curved mating surface above the meshing line is a vertical surface, and the area of ​​the curved mating surface below the meshing line is chamfered. And chamfer satisfy:

[0015] ;

[0016] In the formula, This represents the minimum number of teeth required for both the driving and driven gears.

[0017] Furthermore, the curve radius of the said curved mating surface satisfy:

[0018] ;

[0019] In the formula, This is the thickness of the vertical surface of the curved mating surface.

[0020] Furthermore, the width of the track plates satisfy:

[0021] ;

[0022] In the formula, The width of the track pads. This is the wheelbase between two adjacent load-bearing shafts.

[0023] Furthermore, a friction plate is provided on the contact surface between the track plate and the wheel to be tested.

[0024] Furthermore, the mating gear includes a main gear structure and a limiting plate disposed on the side wall of the main gear structure near the support frame, the limiting plate being fitted to the support frame.

[0025] Furthermore, the meshing line of the mating gear and the track teeth on the track plate coincides with the cylindrical surface of the load-bearing roller, and the side surface of the track plate (101) near the load-bearing shaft group (2) is tangent to the cylindrical surface of the load-bearing roller (203) when passing the load-bearing shaft group (2).

[0026] In a second aspect, embodiments of this disclosure provide a tracked vehicle testing method for heavy-load roll tests of wheels, comprising the following steps:

[0027] Step S1: The drive wheel is driven and drives the driven wheel to rotate through the track. At the same time, the track drives the mating gear and the load-bearing roller to rotate.

[0028] Step S2: The wheel to be tested is vertically placed against the area of ​​the track where the load-bearing shaft assembly is located, and begins to rotate under the action of friction;

[0029] Step S3: Continuously apply downward pressure to the wheel under test until the preset pressure value is reached. Supported by the load-bearing axle assembly, the track always provides a flat support surface to the wheel under test until the preset number of rotations is reached, thus completing the heavy-load rolling test of the wheel.

[0030] Compared with the prior art, the present invention has the following beneficial technical effects:

[0031] This application provides a tracked testing device and method for heavy-load roll tests of machine wheels. In this device, the drive wheel provides power for track rotation and supports the track through a load-bearing axle assembly. The staggered load-bearing rollers in the load-bearing axle assembly ensure that each track plate is kept in the same plane, thereby keeping the contact surface between the test wheel and the track always on the same plane, achieving the purpose of simulating real ground, reducing the deformation of the test wheel, and reducing heat generation. At the same time, since the load-bearing rollers rotate with the track, they do not generate friction on the track. While providing support, the two do not interfere with each other. Therefore, the testing device of this application can obtain accurate and realistic heavy-load roll test data of machine wheels. Attached Figure Description

[0032] Figure 1 A schematic diagram of the tracked test device for heavy-load roll test of wheels in an embodiment of this disclosure is shown;

[0033] Figure 2 This diagram illustrates the positional relationship between the wheel, track, and load-bearing axle assembly under test in an embodiment of this disclosure.

[0034] Figure 3 A schematic diagram of the drive wheel in an embodiment of this disclosure is shown;

[0035] Figure 4 A schematic diagram of the driven wheel in an embodiment of this disclosure is shown;

[0036] Figure 5 A schematic diagram of the track structure in an embodiment of this disclosure is shown;

[0037] Figure 6 A schematic diagram of the track plate structure in an embodiment of this disclosure is shown;

[0038] Figure 7 A side view of the track plate in an embodiment of this disclosure is shown;

[0039] Figure 8 A schematic diagram of the friction plate structure in an embodiment of this disclosure is shown;

[0040] Figure 9 A schematic diagram of the load-bearing shaft assembly in an embodiment of this disclosure is shown;

[0041] Figure 10 A schematic diagram of the mating gear structure in an embodiment of this disclosure is shown;

[0042] Figure 11 A schematic diagram of the slide rail assembly in an embodiment of this disclosure is shown.

[0043] In the diagram: 1-track; 101-track plate; 102-connecting buckle; 103-friction plate; 2-load-bearing shaft assembly; 201-support frame; 202-matching gear; 203-load-bearing roller; 204-load-bearing shaft; 3-drive wheel; 4-driven wheel; 5-tensioning hydraulic cylinder; 6-slide rail assembly; 601-slider; 602-slide rail frame. Detailed Implementation

[0044] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0045] Figure 1 A schematic diagram of a tracked testing device for heavy-load roll testing of machinery wheels, as shown in an embodiment of this disclosure, is illustrated. Figure 1As shown, the device includes a driving wheel 3 and a driven wheel 4, and a track 1 that forms a circular loop on the driving wheel 3 and the driven wheel 4. A load-bearing shaft assembly 2 is provided at the bottom of the track 1 between the driving wheel 3 and the driven wheel 4 to support the wheel under test. It should be noted that the driving wheel 3 is driven by a drive motor, which provides kinetic energy to the driving wheel 3.

[0046] like Figure 2 As shown, the load-bearing shaft assembly 2 is attached to the lower surface of the track 1 via a fixing frame. The load-bearing shaft assembly 2 includes two support frames 201 and multiple load-bearing shafts 204 that are fixedly arranged in parallel between the two support frames 201. A meshing gear 202 that meshes with the edge of the track 1 is fixedly sleeved on one end of each load-bearing shaft 204, and the meshing gears 202 of adjacent load-bearing shafts 204 are staggered. Multiple load-bearing rollers 203 are rotatably sleeved on the shaft of each load-bearing shaft 204, and the load-bearing rollers 203 of adjacent load-bearing shafts 204 are staggered. It should be noted that in this embodiment, the fixing frame also supports the driving wheel 3 and the driven wheel 4, allowing the driving wheel 3 and the driven wheel 4 to be suspended and fixed. The fixing frame is welded from steel plates and is respectively provided with structures connecting to the driving wheel 3, the driven wheel 4, the support frame 201, and the tensioning hydraulic cylinder 5. The shape and structure of the fixing frame can be designed by those skilled in the art based on actual conditions.

[0047] Furthermore, in this embodiment, as Figure 9 As shown, there are five load-bearing shafts 204, evenly and parallelly spaced between two support frames 201. There are also five meshing gears 202, each located at the end of each load-bearing shaft 204 near a support frame 201. Three meshing gears 202 are spaced apart on one support frame 201, and two are spaced apart on the other support frame 201. Four load-bearing rollers 203 are evenly fitted onto each load-bearing shaft 204, with the rollers 203 on adjacent load-bearing shafts 204 staggered. It should be noted that the denser the number of load-bearing shafts 204 and load-bearing rollers 203, the more stable the support provided to the track plates 101 in the track 1, ensuring smooth movement of adjacent track plates 101 even when subjected to pressure from the test wheel.

[0048] like Figure 3 and Figure 4 As shown, both the driving wheel 3 and the driven wheel 4 include two wheel pieces, with an axle connecting the wheel pieces, and the edges of the wheel pieces are provided with teeth that mesh with the track 1;

[0049] The driven wheel 4 has its axle connected to the moving end of the tensioning hydraulic cylinder 5, and its fixed end connected to a fixing frame. A slide rail assembly 6 is provided at the axle of the driven wheel 4. Figure 11As shown, the slide rail assembly 6 includes a slide rail frame 602 fixedly connected to the fixed frame, and a slider 601 slidably disposed on the slide rail frame 602. The slider 601 is fixedly connected to the wheel axle of the moving wheel 4.

[0050] It should be noted that, since the track plate 101 cannot deform during the rotation of the tensioned track 1, the driven wheel 4 will move slightly back and forth relative to the driving wheel 3. If the driven wheel 4 is rigidly fixed, the structure will deform over a long period of time. Therefore, in this embodiment, when the driven wheel 4 moves, the guide effect of the slide rail assembly 6 prevents the driven wheel 4 from skewed. The extension and retraction of the tensioning hydraulic cylinder 5 can make the driven wheel 4 move back and forth along the slide rail 6, changing the distance between the driven wheel 4 and the driving wheel 3, thereby achieving the purpose of tensioning and loosening the track 1, and ensuring that the track 1 under the test wheel always maintains a uniform speed.

[0051] like Figure 5 and Figure 6 As shown, the track 1 includes multiple track plates 101 connected end to end. The edges of adjacent track plates 101 in the width direction are connected by connecting buckles 102. Connecting nails are fixedly provided on the edges of track plates 101 in the length direction. The connecting nails are inserted into the connecting buckles 102, and the connecting buckles 102 can rotate relative to the axis of the connecting nails.

[0052] The adjacent sides of the track plates 101 are provided with curved mating surfaces of the same shape, and the adjacent sides of the adjacent track plates 101 are fitted together through the curved mating surfaces, so that the edges of the adjacent track plates 101 are completely fitted together. When the curved mating surface of any track plate 101 passes the load-bearing roller 203, two track plates 101 simultaneously contact the load-bearing roller 203 and bear the load of the wheel under test, ensuring a smooth and continuous transition.

[0053] The track plate 101 has track teeth on its inner wall along its width, which are used to mesh with the teeth of the drive wheel 3 and the driven wheel 4. It should be noted that two connecting pins are provided on one side of the track plate 101, and the connecting buckle 102 has two through holes, which are respectively inserted into one connecting pin of two adjacent track plates 101.

[0054] In this embodiment, the line connecting the rotation axes of the two connecting pins on the track plate 101 serves as the meshing line of the curved mating surface of the track plate 101. The area of ​​the curved mating surface above the meshing line is a vertical surface, and the area of ​​the curved mating surface below the meshing line is chamfered. ,like Figure 7 As shown, in order to prevent the track plates 101 from interfering with each other when rotating on the driving wheel 3 and the driven wheel 4, the chamfer is applied. satisfy:

[0055] ;

[0056] In the formula, This represents the minimum number of teeth on the driving gear 3 and the driven gear 4.

[0057] Preferably, in order to ensure that two adjacent track plates 101 can pass smoothly over the load-bearing axle 204 without vibration at the chamfer, the track plates 101 below the meshing line do not contact the load-bearing axle assembly 2 due to the chamfer, thus preventing vibration of the track plates 101 passing over the load-bearing axle assembly 2. Therefore, the radius of curvature of the curved mating surface is... satisfy:

[0058] ;

[0059] In the formula, This refers to the thickness of the vertical surface of the curved mating surface.

[0060] Preferably, in order to ensure that the track plate 101 can still maintain its movement along a preset plane when subjected to a heavy load from the wheel under test, the track plate 101 in contact with the wheel under test is supported by at least two sets of load-bearing axles 204 at any given time. Therefore, the width of the track plate 101... satisfy:

[0061] ;

[0062] In the formula, The width of track plate 101, This is the wheelbase between two adjacent load-bearing shafts 204.

[0063] In some embodiments, such as Figure 8 As shown, the contact surface between the track plate 101 and the test wheel is provided with a friction plate 103. The friction plate 103 is used to simulate the runway surface under the actual working environment of the test wheel. It is connected to the track plate 101 by fastening screws. According to the test requirements, friction plates 103 with different friction coefficients can be replaced to test the test data under different usage scenarios.

[0064] like Figure 10As shown, the mating gear 202 includes a main gear structure and a limiting plate disposed on the side wall of the main gear structure near the support frame 201. The limiting plate is fitted to the support frame 201. The limiting plate can restrict the lateral movement of the track plate 101 when a lateral force is applied to the wheel under test. In some embodiments, the meshing line of the mating gear 202 and the track teeth on the track plate 101 coincides with the cylindrical surface of the load-bearing roller 203, and when the track plate 101 passes the load-bearing shaft group 2, the side surface of the track plate 101 facing the load-bearing shaft group 2 is tangent to the cylindrical surface of the load-bearing roller 203, so that when the track plate 101 moves relative to the load-bearing roller 203, the load-bearing roller 203 can withstand the load applied by the track plate 101, and the relative movement of the side surface of the track plate 101 facing the load-bearing shaft group 2 relative to the cylindrical surface of the load-bearing roller 203 is frictionless.

[0065] This embodiment also provides a tracked test method for heavy-load roll tests of machinery wheels, including the following steps:

[0066] Step S1: The drive wheel 3 is driven and drives the driven wheel 4 to rotate through the track 1. At the same time, the track 1 drives the mating gear 202 and the load-bearing roller 203 to rotate. During the rotation of the track 1, the tensioning hydraulic cylinder 5 continuously pushes the driven wheel 4 away from the drive wheel 3 to ensure that the track plate 101 above the load-bearing shaft group 2 is always flat.

[0067] Step S2: The test wheel is vertically placed against the area of ​​the track 1 where the load-bearing shaft group 2 is provided, and the test wheel begins to rotate under the friction of the track 1;

[0068] Step S3: Continuously apply downward pressure to the wheel under test until the preset pressure value is reached. Supported by the load-bearing axle group 2, the track 1 always provides a flat support surface to the wheel under test until the preset number of rotations is reached, thus completing the heavy-load rolling test of the wheel.

Claims

1. A tracked testing device for heavy-load roll tests of machinery wheels, characterized in that, It includes a drive wheel (3) and a driven wheel (4), and a track (1) that forms a loop on the drive wheel (3) and the driven wheel (4). The bottom of the track (1) between the drive wheel (3) and the driven wheel (4) is provided with a load-bearing shaft group (2) to support the wheel to be tested. The load-bearing shaft assembly (2) is attached to the lower surface of the track (1) through a fixing frame. The load-bearing shaft assembly (2) includes two support frames (201) and multiple load-bearing shafts (204) that are fixedly arranged in parallel between the two support frames (201). A gear (202) that meshes with the edge of the track (1) is fixedly sleeved on any end of the load-bearing shaft (204), and the gears (202) of adjacent load-bearing shafts (204) are staggered. Multiple load-bearing rollers (203) are rotatably sleeved on the shaft body of the load-bearing shaft (204), and the load-bearing rollers (203) of adjacent load-bearing shafts (204) are staggered.

2. The tracked testing device for heavy-load roll testing of machinery wheels according to claim 1, characterized in that, Both the driving wheel (3) and the driven wheel (4) include two wheel pieces, with an axle connecting the wheel pieces, and the wheel pieces are provided with teeth on the side that mesh with the track (1); The driven wheel (4) is connected to the moving end of the tensioning hydraulic cylinder (5) at its axle. The fixed end of the tensioning hydraulic cylinder (5) is connected to the fixed frame. A slide rail assembly (6) is provided at the wheel axle of the driven wheel (4). The slide rail assembly (6) includes a slide rail frame (602) fixed to the fixed frame and a slider (601) slidably disposed on the slide rail frame (602). The slider (601) is fixed to the wheel axle of the driven wheel (4).

3. The tracked testing device for heavy-load roll testing of machinery wheels according to claim 2, characterized in that, The track (1) includes multiple track plates (101) connected end to end in sequence. The edges of adjacent track plates (101) are connected by connecting buckles (102). Connecting nails are fixedly provided along the length of the edges of the track plates (101), and the connecting nails are inserted into the connecting buckles (102). The adjacent sides of the track plate (101) are provided with curved mating surfaces of the same shape, and the adjacent sides of the adjacent track plates (101) are fitted together by the curved mating surfaces; The inner wall of the track plate (101) with the width of the track plate (101) is provided with track teeth, which are used to mesh with the teeth of the drive wheel (3) and the driven wheel (4).

4. The tracked testing device for heavy-load roll testing of machinery wheels according to claim 3, characterized in that, The line connecting the rotation axes of the two connecting pins on the track plate (101) serves as the meshing line of the curved mating surface of the track plate (101). The area of ​​the curved mating surface above the meshing line is a vertical surface, and the area of ​​the curved mating surface below the meshing line is chamfered. And chamfer satisfy: ； In the formula, The minimum number of teeth for the driving gear (3) and the driven gear (4).

5. The tracked testing device for heavy-load roll testing of machinery wheels according to claim 4, characterized in that, The curve radius of the curved mating surface satisfy: ； In the formula, This is the thickness of the vertical surface of the curved mating surface.

6. The tracked testing device for heavy-load roll testing of machinery wheels according to claim 3, characterized in that, The width of the track plate (101) satisfy: ； In the formula, The width of the track plate (101) The distance between two adjacent load-bearing shafts (204) is the wheelbase.

7. The tracked testing device for heavy-load roll testing of machinery wheels according to claim 3, characterized in that, The contact surface between the track plate (101) and the wheel to be tested is provided with a friction plate (103).

8. The tracked testing device for heavy-load roll testing of machinery wheels according to claim 1, characterized in that, The mating gear (202) includes a main gear structure and a limiting plate disposed on the side wall of the main gear structure near the support frame (201), the limiting plate being fitted to the support frame (201).

9. The tracked testing device for heavy-load roll testing of machinery wheels according to claim 1, characterized in that, The meshing line of the mating gear (202) and the track teeth on the track plate (101) coincides with the cylindrical surface of the load-bearing roller (203), and the side surface of the track plate (101) near the load-bearing shaft group (2) is tangent to the cylindrical surface of the load-bearing roller (203) when it passes the load-bearing shaft group (2).

10. A tracked vehicle test method for heavy-load roll testing of wheels, characterized in that, The tracked testing device for heavy-load roll testing of machinery wheels according to any one of claims 1-9 includes the following steps: Step S1: The driving wheel (3) is driven and drives the driven wheel (4) to rotate through the track (1). At the same time, the track (1) drives the mating gear (202) and the load-bearing roller (203) to rotate. Step S2: The wheel to be tested is vertically placed against the area of ​​the track (1) where the load-bearing shaft group (2) is set, and it begins to rotate under the action of friction; Step S3: Continuously apply downward pressure to the wheel under test until the preset pressure value is reached. Supported by the load-bearing shaft group (2), the track (1) always provides a flat support surface to the wheel under test until the preset number of rotations is reached, thus completing the heavy-load rolling test of the wheel.

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