Wheel seal and lock assembly, axle assembly, and work machine

Abstract

The application relates to the technical field of working machines, and provides a wheel sealing and locking assembly, an axle assembly, a working machine and a test method of an oil seal. The wheel sealing and locking assembly comprises an axle housing, a wheel hub, a wheel hub bearing and an oil seal, the wheel hub is rotationally connected to the axle housing through the wheel hub bearing, the oil seal is connected between the axle housing and the wheel hub, the oil seal is located on one side of the wheel hub bearing, and the variation amount of the starting torque of the oil seal is less than or equal to a preset multiple of the starting torque tolerance of the wheel hub bearing. The wheel sealing and locking assembly provided by the application is used to solve the defect that the pre-tightening starting torque of the wheel hub bearing is difficult to adjust in batches during the assembly of the axle in the prior art, the relationship between the variation amount of the starting torque of the oil seal and the starting torque tolerance of the wheel hub bearing is limited, the starting torque tolerance of the wheel hub bearing is regulated, and the starting torque of the wheel hub bearing of the axle is within the design range.

Description

Technical Field

[0001] This invention relates to the field of work machinery technology, and in particular to a test method for a wheel-side sealing locking assembly, an axle assembly, work machinery, and an oil seal. Background Technology

[0002] In the mechanical manufacturing process, there are issues with machining and assembly precision. In engineering machinery and some heavy vehicle axles, the preload starting torque of wheel hub bearings must be within a certain design range, that is, the design tolerance value of the preload starting torque of wheel hub bearings, so as to meet the reliability requirements of wheel hub bearings within a certain clearance range.

[0003] To ensure a good service life for wheel hub bearings within the effective preload starting torque range, the tension control range at the circumference of the tire bolts is usually a crucial performance indicator set in the design. However, it is difficult to guarantee this during actual assembly, leading to the wheel hub bearing starting torque failing to meet design requirements, resulting in lower quality standards and even major quality issues requiring the replacement of batches of parts, causing significant economic losses. In particular, the Steyr heavy-duty truck exhibited this quality problem during the assembly of the rear axle, where batch adjustment of the wheel hub bearing preload starting torque was difficult. Summary of the Invention

[0004] This invention provides a wheel-side sealing locking assembly to solve the problem of difficulty in batch adjustment of the preload starting torque of wheel hub bearings during axle assembly in the prior art. By limiting the relationship between the variation of the starting torque of the oil seal and the starting torque tolerance of the wheel hub bearing, the starting torque tolerance of the wheel hub bearing is controlled, so that the starting torque of the wheel hub bearing of the axle is within the design range.

[0005] This invention provides a wheel rim sealing and locking assembly, comprising:

[0006] Axle housing and wheel hub;

[0007] A hub bearing, wherein the hub is rotatably connected to the axle housing via the hub bearing;

[0008] An oil seal is connected between the axle housing and the wheel hub. The oil seal is located on one side of the wheel hub bearing. The variation in the starting torque of the oil seal is less than or equal to a preset multiple of the starting torque tolerance of the wheel hub bearing.

[0009] According to a wheel-side sealing and locking assembly provided by the present invention, a tire bolt is provided circumferentially on the wheel hub. The starting torque tolerance of the wheel hub bearing is determined based on the design tolerance of the tangential tensile force of the tire bolt and the radius of the circumference where the tire bolt is located.

[0010] According to the present invention, a wheel edge sealing locking assembly is provided, wherein the preset multiple is less than or equal to a first threshold and greater than or equal to a second threshold, the current tolerance of the starting torque of the wheel hub bearing is greater than or equal to the preset threshold, and as the current tolerance increases, the preset multiple increases and approaches the first threshold;

[0011] Wherein, the first threshold is less than 1 and the second threshold is greater than 0.

[0012] According to a wheel-side sealing locking assembly provided by the present invention, the current tolerance of the starting torque of the wheel hub bearing is less than or equal to a preset threshold. As the current tolerance decreases, the preset multiple becomes equal to the second threshold, or the preset multiple decreases and approaches the second threshold.

[0013] According to the present invention, a wheel-side sealing and locking assembly is provided, wherein the preset threshold is 3 Nm.

[0014] According to the present invention, a wheel-side sealing and locking assembly is provided, wherein the preset multiple is greater than or equal to 0.25 and less than or equal to 0.4.

[0015] According to the present invention, in a wheel-side sealing locking assembly, the variation in the starting torque of the oil seal is equal to the difference between the maximum and minimum values ​​of multiple starting torque tests.

[0016] According to the present invention, a wheel-side sealing and locking assembly is provided, wherein the oil seal includes a box-type oil seal.

[0017] The present invention also provides an axle assembly, including the wheel-side sealing and locking assembly as described in any of the above claims.

[0018] The present invention also provides a working machine, including the wheel-side sealing and locking assembly as described in any of the above claims.

[0019] This invention also provides a testing method for oil seals, used to test the variation in the starting torque of the oil seal.

[0020] include:

[0021] Based on the rotatable connection between the oil seal and the rotating component, the rotating component is controlled to operate at a set speed for a preset duration;

[0022] The torque data of the oil seal within a set time after startup is obtained;

[0023] The difference between the maximum and minimum values ​​in the torque data is obtained, and the difference is determined as the change in the starting torque of the oil seal.

[0024] According to the oil seal testing method provided by the present invention, in the step of obtaining the torque data of the oil seal within a set time period after startup,

[0025] The rotating component is controlled to start and stop multiple times to obtain torque data within a set duration for each start or stop.

[0026] In the step of obtaining the difference between the maximum and minimum values ​​in the torque data, and determining the difference as the change in the starting torque of the oil seal,

[0027] The difference between the maximum and minimum values ​​among the multiple sets of torque data is determined as the change in the starting torque of the oil seal.

[0028] According to the oil seal testing method provided by the present invention, in the step of controlling the rotating component to start and stop multiple times,

[0029] Between two consecutive starts, control the duration for which the rotating component stops rotating.

[0030] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the oil seal testing method as described above.

[0031] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the oil seal testing method as described above.

[0032] The wheel-side sealing and locking assembly provided by this invention includes: an axle housing, a wheel hub, a wheel hub bearing, and an oil seal. The oil seal is connected between the axle housing and the wheel hub and is located on one side of the wheel hub bearing. The variation in the starting torque of the oil seal is less than or equal to a preset multiple of the starting torque tolerance of the wheel hub bearing. By limiting the relationship between the variation in the starting torque of the oil seal and the starting torque tolerance of the wheel hub bearing, the starting torque tolerance of the wheel hub bearing is adjusted, so that the starting torque of the wheel hub bearing of the axle is within the design range, thus solving the problem of the difficulty in adjusting the starting torque of the wheel hub bearing.

[0033] Furthermore, based on the fact that multiple tire bolts are set along a set circle in the circumference of the wheel hub, the starting torque tolerance of the wheel hub bearing can be determined according to the design tolerance of the tangential tensile force of the tire bolts and the radius of the circle where the tire bolts are located. The calculation method is simple.

[0034] Furthermore, the preset multiplier is a range value that can be adjusted for more accurate calculations. It is also divided into preset thresholds to control the preset multiplier, making the calculation simpler and more accurate. Specifically, when the current tolerance of the wheel bearing's starting torque is greater than or equal to the preset threshold, the preset multiplier increases and approaches the first threshold as the current tolerance of the wheel bearing's starting torque increases. When the current tolerance is less than the preset threshold, the preset multiplier equals the second threshold, or the preset multiplier decreases and approaches the second threshold, as the current tolerance of the wheel bearing's starting torque decreases. This segmented calculation method offers higher accuracy and is simpler to implement. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a partial cross-sectional view of the wheel-side sealing and locking assembly provided by the present invention;

[0037] Figure 2 This is a cross-sectional structural schematic diagram of the box-type oil seal of the wheel-side sealing and locking assembly provided by the present invention;

[0038] Figure 3 This is a flowchart illustrating the oil seal testing method provided by the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention;

[0040] Figure label:

[0041] 1. Oil seal seat ring; 2. Oil seal; 3. Inner bearing of wheel hub; 4. Wheel hub; 5. Axle housing; 6. Outer bearing of wheel hub; 7. Lock nut; 8. Tire bolt;

[0042] 21. Outer ring; 22. Inner ring; 23. Grease. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0044] The preload starting torque of the wheel hub bearing must have a certain design range, that is, the starting torque tolerance value of the wheel hub bearing under preload condition. The tension control range at the circumference of the tire bolt is usually an important performance indicator set in the design. The magnitude of the tension at the circumference of the tire bolt mainly depends on the tightening and adjustment of the nut of the locking structure. The tension tolerance is mainly due to the form and position tolerances of each related component and their fit design, as well as the rotational accuracy of the bearing. Among these, the standard design and rotational accuracy of the bearing can be basically guaranteed, and the form and position tolerances and their fit design of the related components can be basically guaranteed and controlled. However, in some cases, it is still not possible to accurately control the tension tolerance at the circumference of the tire bolt.

[0045] Based on the aforementioned issues, and considering that tensile tolerance is also affected by the performance of the oil seal, and that there are no reliable evaluation indicators and characteristic requirements for the operating accuracy of the oil seal, this is also the reason why it is difficult to adjust the starting torque of the wheel hub bearing of the axle and cannot meet the design requirements.

[0046] An embodiment of the first aspect of the present invention is described below. Figure 1 As shown, a wheel-side sealing and locking assembly is provided, including: an axle housing 5, a wheel hub 4, a wheel hub bearing, and an oil seal 2. The wheel hub 4 is rotatably connected to the axle housing 5 through the wheel hub bearing. The oil seal 2 is connected between the axle housing 5 and the wheel hub 4. The oil seal 2 is located on one side of the wheel hub bearing. The variation of the starting torque of the oil seal 2 is less than or equal to a preset multiple of the starting torque tolerance of the wheel hub bearing.

[0047] A hub bearing is installed between the wheel hub 4 and the axle housing 5. The hub bearing includes an inner hub bearing 3 and an outer hub bearing 6. The starting torque of the hub bearing is the starting torque measured when the hub bearing is fully assembled on the wheel hub 4 and axle housing 5. The starting torque of the hub bearing is not limited by the number or position of the hub bearings.

[0048] By limiting the relationship between the starting torque variation of oil seal 2 and the starting torque tolerance of wheel hub bearing, the starting torque tolerance of wheel hub bearing is adjusted so that the starting torque of wheel hub bearing of axle is within the design range, thus solving the problem of difficult adjustment of starting torque of wheel hub bearing.

[0049] In embodiments of this invention, the correlation between the starting torque variation of the oil seal 2 and the starting torque of the wheel hub bearing is used to solve the problem of the wheel hub bearing starting torque of the axle being unable to be adjusted to the design requirements. Multiple rounds of testing have verified its reliability and effectiveness, ensuring the factory quality of the axle, avoiding major quality problems requiring batch replacement of axle parts, and mitigating economic losses. By standardizing the starting torque variation of the oil seal 2, the tolerance control requirements for the preload starting torque of the wheel hub bearing are met, effectively preventing the quality problem of the wheel hub bearing starting torque being unable to be adjusted to the design requirements, thereby ensuring product performance requirements.

[0050] The preset multiplier is less than 1, meaning the variation in the starting torque of oil seal 2 is less than or equal to the starting torque tolerance of the wheel hub bearing. For example, the preset multiplier is less than or equal to 0.5, 0.4, 0.3, etc., and the size of the preset multiplier can be selected according to actual needs.

[0051] refer to Figure 1 As shown, a hub bearing and an oil seal 2 are installed on the inner ring of the hub 4. The hub bearing is located between the hub 4 and the axle housing 5, and the oil seal 2 is also located between the hub 4 and the axle housing 5. The outer ring of the oil seal 2 directly contacts the hub 4, and the inner ring of the oil seal 2 directly or indirectly contacts the axle housing 5. Generally, the outer ring of the axle housing 5 is provided with an oil seal seat ring 1, which is interference-fitted with the axle housing 5 and tightly attached to the end face of the axle housing 5. The oil seal 2 is located between the outer ring of the oil seal seat ring 1 and the inner ring of the hub 4. The inner ring of the oil seal 2 is interference-fitted with the oil seal seat ring 1, and the outer ring of the oil seal 2 is interference-fitted with the hub 4, with its side flush with the side of the hub 4. The oil seal 2 and the hub bearing are arranged side by side along the axial direction of the axle housing 5.

[0052] The inner hub bearing 3 and the outer hub bearing 6 are assembled with the hub 4 and axle housing 5 via locking nuts 7. The end faces of the inner hub bearing 3 and the outer hub bearing 6 are in close contact with the end face of the hub 4. The outer ring of the hub 4 and the oil seal 2 can rotate via the inner hub bearing 3 and the outer hub bearing 6, thereby ensuring the operation of the axle and realizing movement; the inner hub bearing 3 and the outer hub bearing 6 are pre-tightened via locking nuts 7.

[0053] The starting torque tolerance of the wheel hub bearing can be understood as the difference between the maximum and minimum starting torque of the wheel hub bearing when the locking nut 7 at the end of the axle housing 5 is tightened.

[0054] In some embodiments, reference Figure 1 As shown, wheel hub 4 is provided with tire bolts 8 in the circumference. The starting torque tolerance of the wheel hub bearing is determined based on the design tolerance of the tangential tensile force of the tire bolts 8 and the radius of the circumference where the tire bolts 8 are located. The calculation method is simple.

[0055] This can be understood as follows: the starting torque tolerance of the wheel hub bearing = the design tolerance of the tangential tension of the tire bolt 8 × the radius of the circumference where the tire bolt 8 is located; or, the starting torque tolerance of the wheel hub bearing = the design tolerance of the tangential tension of the tire bolt 8 × the radius of the circumference where the tire bolt 8 is located × K, where K is an influence factor. The influence factor can be calculated based on actual conditions, and the value of K can range from 0.8 to 1.2. The influence factor is used to characterize the deviation of the starting torque tolerance of the wheel hub bearing calculated through the tire bolt 8, thereby improving the accuracy of the calculation.

[0056] Multiple tire bolts 8 are provided on a designated circumference of the wheel hub 4 to secure the wheel hub 4 to one or more mating components, such as connecting the wheel hub 4, brake drum, and wheel rim. The magnitude of the tangential tension on the circumference of the tire bolts 8 can be adjusted by tightening the lock nut 7. The magnitude of the tangential tension on the circumference of the tire bolts 8 is not directly related to the torque variation of the oil seal 2, but it is related to the torque value of the oil seal 2. The starting torque of the wheel hub bearing in the preloaded state is ultimately controlled by the tangential tension on the circumference of the tire bolts 8, thereby ensuring the service life of the wheel hub bearing.

[0057] Multiple tire bolts 8 are circumferentially connected to the wheel hub 4, and these tire bolts 8 are distributed on the same circumference. The tangential tensile force of the tire bolts 8 can be understood as the tangential tensile force on the circumference of each tire bolt 8 when the wheel hub starts operating, and the tangential tensile force at the same circumference. The design tolerance of the tangential tensile force of the tire bolts 8 can be understood as the difference between the maximum and minimum design values ​​of the tangential tensile force. The radius of the circumference of the tire bolts 8 can be referenced. Figure 1 The R is indicated in the middle.

[0058] Of course, the starting torque tolerance of a wheel hub bearing can also be the difference between the maximum and minimum starting torque that the wheel hub bearing is required to bear.

[0059] Under normal circumstances, the starting torque variation of the wheel hub bearing is between 2 Nm and 5 Nm. Based on the design range limitation of the starting torque tolerance of the wheel hub bearing, the starting torque variation of oil seal 2 will not be too large or too small.

[0060] In some embodiments, the preset multiple is less than or equal to a first threshold and greater than or equal to a second threshold, wherein the first threshold is less than 1 and the second threshold is greater than 0.

[0061] The preset multiplier is a value between 0 and 1, which means that the variation in the starting torque of oil seal 2 is not greater than the starting torque tolerance of the wheel hub bearing.

[0062] The first threshold can be 0.5, 0.4, 0.3, etc., and is the maximum value of a preset multiple. The first threshold is less than 1. The second threshold can be 0.1, 0.2, etc., and is greater than 0.

[0063] In some embodiments, the current tolerance of the starting torque of the hub bearing is greater than or equal to a preset threshold, and as the current tolerance increases, the preset multiple increases and approaches the first threshold.

[0064] The current tolerance of the starting torque of the wheel hub bearing can be directly proportional to a preset multiple, or it can vary according to a set pattern. A positive correlation between the preset multiple and the current tolerance, and a more accurate selection of the preset multiple, results in a more accurate calculation of the current tolerance of the starting torque of the wheel hub bearing.

[0065] The preset multiple can be increased from the second threshold to the first threshold, or from the third threshold between the second threshold and the first threshold to the first threshold. The boundary value of the preset multiple can be selected as needed.

[0066] In some embodiments, the current tolerance of the starting torque of the hub bearing is less than a preset threshold. As the current tolerance decreases, the preset multiple equals the second threshold, or the preset multiple decreases and moves closer to the second threshold.

[0067] Using a preset threshold as a dividing line, the adjustment methods for preset multiples differ.

[0068] The preset multiplier can be reduced from the third threshold between the first threshold and the second threshold to the second threshold, and the third threshold can be selected as needed.

[0069] In some embodiments, the preset threshold is 3 Nm.

[0070] Of course, the preset threshold can also be selected as 2.5 Nm, 3.2 Nm, etc., and the specific value of the preset threshold is not limited. Generally, the preset threshold is around 3 Nm, within 5 Nm, and above 2 Nm. The preset threshold is limited to 3 Nm here because using 3 Nm as a dividing line makes the selection of the preset multiple more accurate.

[0071] In some embodiments, the preset multiple is greater than or equal to 0.25 and less than or equal to 0.4, with a wide range of preset multiples. That is, the design requirement for the variation of the starting torque of oil seal 2 is not greater than 0.25 to 0.4 of the preload starting torque tolerance of the wheel hub bearing.

[0072] Specifically, when the preset threshold is 3 Nm, the preset multiple is greater than or equal to 0.25 and less than or equal to 0.4. That is, if the starting torque tolerance of the wheel hub bearing is less than 3 Nm, it is taken as no more than 0.25 of the starting torque tolerance of the wheel hub bearing; if the starting torque tolerance of the wheel hub bearing is greater than or equal to 3 Nm, it is taken as no more than 0.4 of the preload starting torque tolerance of the wheel hub bearing.

[0073] In some cases, the starting torque tolerance of oil seal 2 is generally designed to be equivalent to one-third of the tensile force tolerance at the circumference of tire bolt 8. If the axle is complex, there are many changes in the related parts, and the precision is poor, it can be improved to one-third to one-quarter of the tensile force tolerance at the circumference of tire bolt 8.

[0074] In some embodiments, the variation in the starting torque of the oil seal 2 is equal to the difference between the maximum and minimum values ​​obtained from multiple starting torque tests. By conducting multiple starting torque tests, the maximum and minimum starting torque values ​​are obtained, and the variation is the difference between the maximum and minimum values. This method is simple to detect and easy to calculate.

[0075] The number of times the starting torque of oil seal 2 is measured can be selected as needed, such as two, three, or five times. The number of measurements can be selected based on the performance of oil seal 2. If the performance of oil seal 2 is stable, the maximum and minimum values ​​during a single start-up can be measured. If the stability of oil seal 2 is poor, the number of measurements can be increased to improve the accuracy of the measurement.

[0076] In some embodiments, the oil seal 2 includes a box-type oil seal with a built-in rotary sealing structure, which is suitable for oil seal 2 of axles.

[0077] In engineering machinery and some heavy-duty vehicle axles, the wheel-side sealing structure typically uses a box-type oil seal with better waterproof and mud-proof performance to prevent leakage of the oil seal inside the wheel-side. The box-type oil seal can be... Figure 2 The self-contained rotary sealing structure shown is composed of multiple different cavities, which inherently ensures excellent sealing performance even in complex working environments. For example... Figure 2 As shown, the box-type oil seal includes an outer ring 21 and an inner ring 22, with grease 23 added to the inner lip of the cavity.

[0078] Of course, the oil seal 2 in the axle is not limited to the use of box-type oil seals; other types of oil seals 2 can also be used to adjust the change in starting torque as needed.

[0079] Based on the above embodiments, the calculation process for the variation in starting torque of a box-type oil seal is illustrated below:

[0080] The first step is to calculate the design requirements for the starting torque tolerance T01 under the preload condition of the wheel hub bearing:

[0081] Among them, the tangential tensile force tolerance F01 of the tire bolt 8: the tangential tensile force F is designed to be (70~90)N, F01=Fmax-Fmin, F01=20N;

[0082] Variation in preload starting torque of wheel hub bearing: The diameter D of the circumference where tire bolt 8 is located is 0.335m, R=D / 2, T01=F01*(D / 2), and T01=3.35Nm is calculated.

[0083] The second step is to determine the design requirements for the starting torque variation T11 of the box-type oil seal:

[0084] Based on a preset threshold of 3 Nm, a first threshold of 0.25, and a second threshold of 0.4;

[0085] Given that T01 = 3.35 Nm > 3 Nm, T11 = 0.4 * T01, and T11 = 1.34 Nm, the design requirement for the starting torque variation of the box-type oil seal is no greater than 1.34 Nm. Our design requirement can be determined to be no greater than 1.25 Nm, which meets the design requirements for the starting torque of the axle wheel hub bearing.

[0086] According to a second aspect of the present invention, an axle assembly is provided, including a wheel-side sealing and locking assembly as described above. Since the wheel-side sealing and locking assembly has the aforementioned beneficial effects, the axle assembly has the aforementioned beneficial effects. For details, please refer to the above content, which will not be repeated here.

[0087] According to a third aspect of the present invention, a working machine is provided, including an axle assembly as described above. If the axle assembly has the aforementioned beneficial effects, then the working machine will have the aforementioned beneficial effects. For details, please refer to the above content, which will not be repeated here.

[0088] Operating machinery has wheel-side sealing and locking components and can include heavy-duty trucks, construction machinery, such as automobiles, cranes, excavators, pile drivers, mixers, etc. Operating machinery is diverse in type and has a wide range of applications.

[0089] According to a fourth aspect of the present invention, an oil seal 2 is provided, wherein the starting torque variation of the oil seal 2 is within a preset range.

[0090] The range of variation in the starting torque of oil seal 2 directly affects the control of the preload starting torque range of the wheel hub bearing, which is an important characteristic indicator of oil seal 2. This paper proposes the important design parameter of the variation in the starting torque of oil seal 2, and also specifies the design requirements for the characteristics of this variation.

[0091] Taking the cassette oil seal as an example, the cassette oil seal has a built-in rotary sealing structure, and the variation of its starting torque contributes greatly to the control of the starting torque of the wheel hub bearing in the preloaded state. Adding the parameter of starting torque variation to the design of the cassette oil seal is a very important characteristic.

[0092] The preset range corresponds to the above-mentioned "the variation in the starting torque of oil seal 2 is less than or equal to the preset multiple of the starting torque tolerance of the wheel hub bearing".

[0093] In some embodiments, the wheel hub 4 is provided with tire bolts 8 in the circumferential direction. The starting torque tolerance of the wheel hub bearing is determined based on the design tolerance of the tangential tensile force of the tire bolts 8 and the radius of the circumference where the tire bolts 8 are located.

[0094] In some embodiments, the preset multiple is less than or equal to a first threshold and greater than or equal to a second threshold, the current tolerance of the starting torque of the hub bearing is greater than or equal to the preset threshold, and as the current tolerance increases, the preset multiple increases and approaches the first threshold;

[0095] Among them, the first threshold is less than 1 and the second threshold is greater than 0.

[0096] In some embodiments, the current tolerance of the starting torque of the hub bearing is less than or equal to a preset threshold. As the current tolerance decreases, the preset multiple equals the second threshold, or the preset multiple decreases and moves closer to the second threshold.

[0097] In some embodiments, the preset threshold is 3 Nm.

[0098] In some embodiments, the preset multiple is greater than or equal to 0.25 and less than or equal to 0.4.

[0099] In some embodiments, the variation in starting torque of oil seal 2 is equal to the difference between the maximum and minimum values ​​of multiple starting torque tests.

[0100] The specific design parameters of oil seal 2 can be found in the above embodiment of the wheel-side sealing and locking assembly, and will not be repeated here.

[0101] An embodiment of the fourth aspect of the present invention is described below. Figure 3 As shown, a test method for oil seal 2 is provided, including:

[0102] Step 110: Based on the rotatable connection between the oil seal 2 and the rotating component, control the rotating component to operate at a set speed for a preset time;

[0103] The test method for oil seal 2 can be performed by a test device specifically designed for testing oil seal 2. The test device includes a rotating component that can rotate relative to oil seal 2 under external force. The rotating component is sleeved on the outside of oil seal 2 so that there is a torsional torque between oil seal 2 and rotating component. The rotation speed and rotation duration of the rotating component can be controlled. The rotating component is used to simulate wheel hub 4.

[0104] Of course, the test method for oil seal 2 can also be performed on the wheel edge sealing locking assembly. By installing oil seal 2 on the wheel edge sealing locking assembly and controlling the rotation of wheel hub 4, wheel hub 4 can be used as a rotating part, and the detected parameters are more accurate. Wheel hub 4 can be started and stopped.

[0105] The speed setting can be selected from 10 to 20 revolutions per minute, offering a wide range of options. The preset duration can be selected from 3 to 6 minutes.

[0106] Step 120: Obtain the torque data of oil seal 2 within a set time after startup;

[0107] Torque data can be understood as all the continuous torque values ​​within a set time period, or torque values ​​at multiple time points. The collection of all torque values ​​is torque data, which includes multiple torque values ​​within the set time period.

[0108] The duration can be set to (3-8) seconds, such as 5 seconds.

[0109] Step 130: Obtain the difference between the maximum and minimum values ​​in the torque data. The difference is determined as the change in starting torque of oil seal 2.

[0110] The difference can be obtained by extracting the maximum and minimum values ​​from the torque data. The calculation method for the change in starting torque of oil seal 2 is simple.

[0111] It should be noted that if there are obviously abnormal data in the torque data, they can be removed, such as if the order of magnitude of the torque value changes.

[0112] This invention provides a method for testing the variation of the starting torque of oil seal 2, so as to evaluate whether the variation of the starting torque of oil seal 2 meets the design requirements, standardize the design of the variation of the starting torque of oil seal 2, meet the starting torque tolerance control under the preload state of wheel hub bearing, avoid the problem that the starting torque of the wheel hub bearing of the axle cannot be adjusted to the design requirements, and thus ensure the product performance requirements.

[0113] In some embodiments, in step 120, that is, in the step of obtaining the torque data of the oil seal 2 within a set time period after startup...

[0114] Step 121: Control the rotating component to start and stop multiple times, and obtain torque data within a set time after each start;

[0115] Multiple starts and stops allow for multiple data collections, resulting in more accurate and comprehensive data collection, avoiding the limitations of single-collection data.

[0116] In step 130, that is, in the step of obtaining the difference between the maximum and minimum values ​​in the torque data, and determining the difference as the change in the starting torque of oil seal 2;

[0117] Step 131: Determine the difference between the maximum and minimum values ​​in the multiple sets of torque data as the change in starting torque of oil seal 2.

[0118] By comparing multiple sets of torque data, the difference was obtained, and the measurement of the starting torque variation of oil seal 2 was more accurate.

[0119] In some embodiments, in step 121, during the step of controlling the rotating component to start and stop multiple times...

[0120] Between two consecutive starts, control the duration for which the rotating component stops rotating.

[0121] Between two consecutive starts, the rotating parts are kept stopped for a period of time. This period is called the shutdown duration. This provides time for the rotating parts and oil seal 2 to recover, avoiding the problem that the torque affected by the previous test cannot be completely unloaded, and also avoiding the temperature change caused by rotational friction from affecting the performance of oil seal 2.

[0122] Based on the above embodiments, taking the test of a box-type oil seal as an example, the test method of oil seal 2 will be illustrated.

[0123] 1. Test sample:

[0124] 1) The test samples must meet the requirements of the design drawings.

[0125] 2) There shall be no fewer than 3 test samples, and design drawings and test reports shall be attached.

[0126] 3) The samples are randomly selected, and the sampling base is no less than 50 pieces.

[0127] 2. Test methods

[0128] 1) Test equipment and instruments

[0129] a. Oil seal 2 operating test bench or equivalent equipment.

[0130] b. The servo motor automatically detects rotational torque data.

[0131] c. Detection accuracy ≤ 2%.

[0132] 2) Start-up and operation test

[0133] a. Starting and operating speed of rotating parts: (10-20) RPM.

[0134] b. Data Acquisition: For the first sample, run for (3-6) minutes, and record the torque variation range within 5 seconds of startup; stop for 3-6 minutes, restart, run for (3-6) minutes, and record the torque variation range within 5 seconds of startup. Repeat this cycle three times, recording three sets of torque data ranges. Select the maximum and minimum values ​​within the three sets of data ranges; the difference between these values ​​is the starting torque variation of the box-type oil seal for the first sample.

[0135] c. Repeat step b to test the second and third samples. Obtain the variation in starting torque of the box-type oil seal for the second and third samples.

[0136] Finally, the largest torque variation among the three samples is determined as the starting torque variation of this batch of cassette oil seals. For example, the difference between the maximum and minimum starting torque of the three samples is the starting torque variation of the cassette oil seal; or, the starting torque variation is obtained for each sample, and the largest value is taken as the starting torque variation of the cassette oil seal.

[0137] In summary, the embodiments of the present invention address the important characteristic indicator of the starting torque variation of the cassette oil seal 2; they also specify design requirements for the characteristic of the starting torque variation of the cassette oil seal; and a test method for the starting torque variation of the cassette oil seal is proposed. Based on the design requirements and testing of the starting torque variation of the cassette oil seal, the problem of batch quality where the wheel-side torque of Steyr cannot be adjusted is solved.

[0138] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4 As shown, the electronic device may include a processor 810, a communications interface 820, a memory 830, and a communication bus 840. The processor 810, communications interface 820, and memory 830 communicate with each other via the communication bus 840. The processor 810 can call logical instructions from the memory 830 to execute the oil seal testing methods provided by the aforementioned methods.

[0139] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0140] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, and when the program instructions are executed by a computer, the computer is able to execute the oil seal testing methods provided by the above methods.

[0141] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the oil seal testing methods provided by the methods described above.

[0142] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0143] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wheel-side sealing and locking assembly, characterized in that, include: Axle housing and wheel hub; A hub bearing, wherein the hub is rotatably connected to the axle housing via the hub bearing; An oil seal is connected between the axle housing and the wheel hub. The oil seal is located on one side of the wheel hub bearing. The variation in the starting torque of the oil seal is less than or equal to a preset multiple of the starting torque tolerance of the wheel hub bearing. The preset multiple is less than or equal to a first threshold and greater than or equal to a second threshold. The current tolerance of the starting torque of the wheel hub bearing is greater than or equal to the preset threshold. As the current tolerance increases, the preset multiple increases and approaches the first threshold. Wherein, the first threshold is less than 1 and the second threshold is greater than 0. The current tolerance of the starting torque of the wheel hub bearing is less than the preset threshold. As the current tolerance decreases, the preset multiple equals the second threshold, or the preset multiple decreases and approaches the second threshold.

2. The wheel-side sealing and locking assembly according to claim 1, characterized in that, The wheel hub is provided with tire bolts in the circumference. The starting torque tolerance of the wheel hub bearing is determined based on the design tolerance of the tangential tensile force of the tire bolts and the radius of the circumference where the tire bolts are located.

3. The wheel-side sealing and locking assembly according to claim 1, characterized in that, The preset threshold is 3 N·m.

4. The wheel-side sealing and locking assembly according to any one of claims 1 to 3, characterized in that, The preset multiple is greater than or equal to 0.25 and less than or equal to 0.

4.

5. The wheel-side sealing and locking assembly according to any one of claims 1 to 3, characterized in that, The variation in the starting torque of the oil seal is equal to the difference between the maximum and minimum values ​​of multiple starting torque tests.

6. The wheel-side sealing and locking assembly according to any one of claims 1 to 3, characterized in that, The oil seal includes a box-type oil seal.

7. An axle assembly, characterized in that, Includes the wheel-side sealing and locking assembly as described in any one of claims 1 to 6.

8. A type of operating machinery, characterized in that, Includes the wheel-side sealing and locking assembly as described in any one of claims 1 to 6.

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