A bending fatigue testing device and testing system

Abstract

This utility model provides a bending fatigue testing device and system, relating to the technical field of gear fatigue testing devices. The bending fatigue testing device includes a base and a ballast. The base includes paired mounting platforms for supporting the bevel gear under test. The ballast applies a vertical load synchronously to the tooth surfaces of both bevel gears. The paired mounting platforms are mirror-symmetrically arranged, with the ballast positioned in the middle. By designing the paired mounting platforms of the base as a mirror-symmetrical structure and placing the ballast in the middle, this device utilizes the principle of symmetrical mechanics. When a vertical load is applied synchronously to the tooth surfaces of both bevel gears, the horizontal component of the force generated by the tilting of the bevel gear tooth surfaces cancels each other out. This solves the technical problem of instability caused by the horizontal component force in traditional tests, thus enabling accurate determination of the bending fatigue strength of the bevel gear tooth surfaces. The testing system, including this bending fatigue testing device, has corresponding beneficial effects.

Description

Technical Field

[0001] This utility model relates to the technical field of gear fatigue testing devices, and in particular to a bending fatigue testing device and testing system. Background Technology

[0002] As a core component of power transmission, gear fatigue failure is one of the main causes of mechanical system failures. In existing technologies, bending fatigue testing of spur gears is relatively mature, such as... Figure 1 As shown, a vertical cyclic load is typically applied using a double-head fixture until the gear teeth fracture to obtain the SN curve. However, due to the inclined tooth surface, bevel gears generate a horizontal component during vertical loading, causing instability in the test system. Existing methods cannot accurately test their bending fatigue strength. The industry lacks reliable testing schemes for bevel gears, leading to reliance on empirical estimations for design verification, resulting in low accuracy and high cost. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a bending fatigue testing device and testing system to solve the related problems in the prior art.

[0004] To achieve the above and other related objectives, this utility model provides a bending fatigue testing device, comprising:

[0005] The base includes a pair of mounting platforms for supporting the bevel gear being tested;

[0006] Ballast components are used to simultaneously apply vertical loads to the tooth surfaces of both bevel gears;

[0007] The assembly platforms are arranged in pairs in a mirror-symmetric manner, and the ballast component is located in the middle of the pair of assembly platforms.

[0008] Furthermore, the mounting platform is provided with mating holes, and the mating holes of the paired mounting platforms are located on the same axis. The mating holes are used to install the shaft portion of the bevel gear.

[0009] Furthermore, it also includes two sets of fixing members, which respectively cooperate with two bevel gears. The fixing members pass through the mating holes to fix the bevel gears.

[0010] Furthermore, the fixing member is a spline shaft, including a spline mating section, an insertion section and a limiting section arranged sequentially along the axial direction;

[0011] The outer peripheral surface of the spline mating section is provided with spline teeth, which form a circumferential positioning fit with the spline tooth groove on the inner side of the shaft of the bevel gear;

[0012] The insertion section mates with the mating hole;

[0013] The outer diameter of the limiting section is larger than the diameter of the mating hole, which is used to limit the axial displacement of the bevel gear.

[0014] Furthermore, the length of the insertion section is less than the length of the mating hole, and the limiting section abuts against the outer end face of the fitting table to form an axial fixing structure.

[0015] Furthermore, the ballast component includes a ballast pressure-bearing head and two ballast mounting blocks;

[0016] The two ends of the ballast pressure head are respectively connected to the two ballast mounting blocks to form an inverted U-shaped frame structure. Ballast mating protrusions are provided on the inner sidewalls of both sides of the ballast mounting blocks to contact the tooth surfaces of the bevel gears on both sides.

[0017] Furthermore, the two ballast mounting blocks are symmetrically distributed about the central axis of the ballast pressure head.

[0018] Furthermore, the contact surface of the ballast fitting protrusion is an arc-shaped surface adapted to the tooth surface of the bevel gear.

[0019] This application also provides a testing system, which includes the above-described bending fatigue testing device, and further includes a fixed platform and a pressure driving component, wherein the base is fixedly mounted on the fixed platform, and the pressure driving component is connected to the ballast component.

[0020] Furthermore, it also includes a data acquisition device, which is communicatively connected to the bending fatigue testing device to acquire test data, wherein the test data includes at least the driving parameters of the pressure-applying drive component.

[0021] As described above, the bending fatigue testing device and system of this utility model have at least the following beneficial effects, including but not limited to:

[0022] The bending fatigue testing device in this application designs the paired mounting platforms of the base as a mirror-symmetrical structure, with the ballast component positioned in the middle. Utilizing the principle of symmetrical mechanics, when a vertical load is simultaneously applied to the tooth surfaces of the two bevel gears, the horizontal component forces generated by the tilting of the bevel gear tooth surfaces can cancel each other out. This solves the technical problem of test system instability caused by the horizontal component force in traditional tests, ensuring that the vertical load only generates pure bending stress on the tooth surface, thereby enabling accurate determination of the bending fatigue strength of the bevel gear tooth surface. This symmetrical layout device design can also simulate the force pattern of the half-shaft gear in a differential, while also fulfilling the function of static strength testing of the half-shaft bevel gear.

[0023] The testing system of this application rigidly fixes the bending fatigue testing device with a fixed platform, providing a stable benchmark for bevel gear testing and suppressing the vibration deviation of the base under cyclic load. Combined with the mirror-symmetrical mounting platform structure, it further enhances the overall stability of the system and ensures the accuracy of load application. After the pressure driving component is connected to the ballast component, it can output a standard waveform vertical cyclic load, accurately simulating the force frequency and amplitude of the bevel gear under actual working conditions, meeting the quantitative requirements of fatigue testing for dynamic load, and making the test results closer to engineering application scenarios. Attached Figure Description

[0024] Figure 1 The diagram shows a schematic of a spur gear tooth surface bending fatigue test structure in related technologies.

[0025] Figure 2 This is one of the structural schematic diagrams of the bending fatigue testing device in this application;

[0026] Figure 3 The second schematic diagram shows the structure of the bending fatigue testing device in this application.

[0027] Figure 4 The third schematic diagram of the bending fatigue testing device in this application is shown.

[0028] Figure 5 The diagram shown is a structural schematic of the base in this application;

[0029] Figure 6 The diagram shown is a structural schematic of the fastener in this application.

[0030] Figure 7 The diagram shown is a structural schematic of the ballast component in this application.

[0031] Figure 8 The diagram shown is a schematic diagram of the structural layout of an experimental system according to this application.

[0032] Icons: 01. Bevel gear, 1. Base, 2. Mounting platform, 3. Ballast component, 4. Mating hole, 5. Fixing component, 6. Spline mating section, 7. Insertion section, 8. Limiting section, 9. Ballast pressure head, 10. Ballast mounting block, 11. Ballast mating protrusion, 12. Fixing platform, 13. Pressure driving component. Detailed Implementation

[0033] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0034] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0035] Please refer to Figures 2-5 This application discloses a bending fatigue testing device, including a base 1 and a ballast 3. The base 1 includes a pair of mounting platforms 2, which are used to support the bevel gear 01 under test. The ballast 3 is used to apply a vertical load to the tooth surfaces of the bevel gears 01 on both sides simultaneously. The pair of mounting platforms 2 are arranged in a mirror symmetrical manner, and the ballast 3 is located in the middle position of the pair of mounting platforms 2.

[0036] It is worth noting that the bending fatigue testing device in this application designs the paired mounting platforms 2 of the base 1 as a mirror-symmetrical structure, and positions the ballast 3 in the middle. Utilizing the principle of symmetrical mechanics, when a vertical load is simultaneously applied to the tooth surfaces of the bevel gears 01 on both sides, the horizontal component of the force generated by the tilting of the bevel gear 01 tooth surfaces can cancel each other out. This solves the technical problem of instability of the test system caused by the horizontal component force in traditional tests, ensuring that the vertical load only generates pure bending stress on the tooth surfaces, thereby enabling accurate determination of the bending fatigue strength of the bevel gear 01 tooth surfaces. This symmetrical layout device design can also simulate the force pattern of the half-shaft gear in a differential, and also take into account the static strength testing function of the half-shaft bevel gear 01.

[0037] Please refer to Figure 5 The mounting platform 2 is provided with mating holes 4, and the mating holes 4 of the mounting platforms 2 arranged in pairs are located on the same axis. The mating holes 4 are used to install the shaft part of the bevel gear 01.

[0038] It should be noted that, based on the mirror-stacked arrangement of the paired mounting platforms 2, the axes of the mating holes 4 of the paired mounting platforms 2 are collinear, ensuring the coaxiality of the installation of the bevel gear 01 shaft, avoiding uneven load distribution caused by axis deviation, so that the vertical load applied by the ballast 3 can be symmetrically transmitted along the axis of the two bevel gears 01, ensuring that the load on the two bevel gears 01 is the same.

[0039] In some embodiments, two sets of fixing members 5 are further included, which respectively cooperate with two bevel gears 01. The fixing members 5 pass through the mating holes 4 to fix the bevel gears 01.

[0040] Please refer to Figure 3 , Figure 4 and Figure 6 The fixing member 5 is a spline shaft, including a spline mating section 6, an insertion section 7, and a limiting section 8 arranged sequentially along the axial direction; the outer peripheral surface of the spline mating section 6 is provided with spline teeth, which form a circumferential positioning fit with the spline tooth groove on the inner side of the shaft of the bevel gear 01; the insertion section 7 fits with the mating hole 4; the outer diameter of the limiting section 8 is larger than the diameter of the mating hole 4, which is used to limit the axial displacement of the bevel gear 01.

[0041] Specifically, the fastener 5 adopts an axial three-section structure, using a segmented design of spline-fitting section 6, insertion section 7, and limiting section 8 to achieve the installation, fixation, and positioning of the bevel gear 01 under test. Specifically, the outer spline teeth of the spline-fitting section 6 mesh with the inner spline tooth grooves of the bevel gear 01 shaft, forming a circumferential fixed positioning; the insertion section 7 inserts into the mating hole 4, providing radial support and insertion guidance; the outer diameter of the limiting section 8 is larger than the diameter of the mating hole 4, restricting the axial movement of the bevel gear 01; optionally, the limiting section can also be fixedly connected to the outer wall of the mounting table via threaded parts to ensure its fixed position. Therefore, this fastener 5 not only achieves high positioning accuracy and a compact structure but also improves assembly and fixing efficiency.

[0042] In some embodiments, the length of the insertion section 7 is less than the length of the mating hole 4, and the limiting section 8 abuts against the outer end face of the mating platform 2 to form an axial fixing structure.

[0043] It should be noted that the length of the insertion section 7 is less than the thickness of the mounting platform 2, ensuring that there is enough space for the inner and outer sides of the shaft of the bevel gear 01 to mate with the spline mating section 6 and the mating hole 4 respectively. The limiting section 8 provides a clear axial positioning reference through physical contact. The fixing structure is simple and effective, ensuring the connection reliability of the bevel gear 01 under vibration load.

[0044] In another embodiment, the fixing component can also adopt an expansion sleeve type fixing component, an electromagnetic adsorption type component, or a threaded connector or similar structural method to achieve the corresponding fixing assembly, as long as the corresponding fixing effect is met, without too many limitations here.

[0045] Please refer to Figure 7 The ballast component 3 includes a ballast pressure-bearing head 9 and two ballast mounting blocks 10. The two ends of the ballast pressure-bearing head 9 are respectively connected to the two ballast mounting blocks 10 to form an inverted U-shaped frame structure. Ballast mating protrusions 11 are provided on the inner sidewalls of both sides of the ballast mounting blocks 10 to contact the tooth surfaces of the bevel gears 01 on both sides.

[0046] Specifically, the ballast bearing head 9 is used to bear the externally applied load and transmit the load. Two ballast mounting blocks 10 are set to form an inverted U-shaped frame structure with the ballast bearing head 9 to facilitate stable and reliable application of load to the bevel gear 01 through two pressure points. The ballast mounting blocks 10 are provided with ballast mating protrusions 11 on the inner side walls on both sides to contact and engage with the tooth surfaces of the bevel gears 01 on both sides, ensuring that the applied load is synchronously transmitted to the two bevel gears 01.

[0047] In some embodiments, the two ballast mounting blocks 10 are symmetrically distributed about the central axis of the ballast pressure head 9.

[0048] Specifically, by symmetrically distributing the two ballast mounting blocks 10 around the central axis of the pressure head, the distance from the ballast mounting blocks 10 to the central axis is equal, ensuring that the loads formed on both sides are equal, ensuring that the loads applied to both sides of a single bevel gear 01 are the same, and ensuring the stability of the pressure application process.

[0049] In some embodiments, the contact surface of the ballast mating protrusion 11 is an arc-shaped surface adapted to the tooth surface of the bevel gear 01.

[0050] Specifically, the contact surface of the ballast fitting protrusion 11 is designed with a matching arc shape to ensure that the simulated load on the bevel gear 01 is consistent with the actual situation, and better fit and contact ensure stable load transmission, thus better simulating the realism of stress simulation. The ballast fitting protrusion 11 in contact with the bevel gear 01 can be designed by contouring according to the pattern in the actual structure, thereby ensuring that its load is consistent with the actual situation.

[0051] Please refer to Figure 8 This application also provides a test system including the above-described bending fatigue test device, having all its beneficial effects, and further including a fixed platform 12 and a pressure driving member 13, wherein the base 1 is fixedly installed on the fixed platform 12, and the pressure driving member 13 is connected to the ballast member 3.

[0052] In a specific application within the testing system, the fixed platform 12 provides a rigid foundation for the base 1 of the bending fatigue testing device, effectively controlling the vibration of the base 1 during the test. Optionally, it can be installed and fixed via a threaded connection. The pressure-applying drive component 13 is connected to the load component 3, and can output cyclic loads required for the test, such as a standard sine wave, to perform unidirectional sinusoidal loading, meeting the requirements of fatigue testing for load waveform and frequency, and ensuring the integrity of the test process. Optionally, the pressure-applying drive component 13 can be a hydraulic drive component or a servo drive motor, etc., to achieve the corresponding loading requirements; no excessive restrictions are imposed here. Its loading head and load component 3 can be connected in various ways, such as clamping connection, threaded connection, etc. It should be noted that this bending fatigue testing device can also be used as part of other testing systems to perform tests under different working conditions.

[0053] In some embodiments, a data acquisition device is also included, which is communicatively connected to the bending fatigue testing device to acquire test data, wherein the test data includes at least the driving parameters of the pressure driving member 13.

[0054] In practical applications, the data acquisition instrument can be an industrial control computer or a commercial computer, equipped with dedicated data acquisition software, capable of real-time display, storage, and analysis of the received data. Its driving parameters may include driving displacement and cycle count; the test data also includes the state parameters of the tested gear, such as the magnitude of deformation displacement, stress-deformation curve, and tooth surface bending fatigue life. The entire test typically uses 5-8 load levels, with 3-5 sets of tests performed under the same load to ensure the reliability and accuracy of the bevel gear 01 bending fatigue strength evaluation results. A systematic setup allows for complete recording of all key parameters during the testing process, providing accurate data support for subsequent analysis. Digital monitoring and recording improve the reliability and efficiency of the test, enabling a more accurate assessment of the fatigue performance of the tested gear.

[0055] In summary, the bending fatigue testing device in this application designs the paired mounting platforms 2 of the base 1 as a mirror-symmetric structure and places the ballast 3 in the middle position. Utilizing the principle of symmetric mechanics, when a vertical load is applied synchronously to the tooth surfaces of the bevel gears 01 on both sides, the horizontal component force generated by the tilting of the bevel gear 01 tooth surfaces can cancel each other out. This solves the technical problem of instability of the test system caused by the horizontal component force in traditional tests, ensuring that the vertical load only generates pure bending stress on the tooth surface, thereby enabling accurate determination of the bending fatigue strength of the bevel gear 01 tooth surface. This symmetrical layout of the device design can also simulate the force form of the half-shaft gear in the differential, and take into account the static strength test function of the half-shaft bevel gear 01. The test system of this application rigidly fixes the bending fatigue test device through the fixed platform 12, providing a stable reference for the bevel gear 01 test, suppressing the vibration deviation of the base 1 under cyclic load, and further enhancing the overall stability of the system with the mirror symmetrical mounting platform 2 structure, ensuring the accuracy of load application. After the pressure driving component 13 is connected to the ballast component 3, it can output the vertical cyclic load of standard waveform, accurately simulating the force frequency and amplitude of the bevel gear 01 under actual working conditions, meeting the quantitative requirements of fatigue test for dynamic load, and making the test results closer to the engineering application scenario.

[0056] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0057] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of this application. However, those skilled in the art will recognize that embodiments of this invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of this application.

[0058] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments described herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0059] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0060] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0061] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0062] The above description of the embodiments shown in this utility model (including the content in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments of this application, and such modifications will be within the spirit and scope of the utility model.

[0063] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of the embodiments of this application. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring various aspects of the embodiments of this application.

Claims

1. A flex fatigue testing apparatus characterized by, include: The base includes a pair of mounting platforms for supporting the bevel gear being tested; Ballast components are used to simultaneously apply vertical loads to the tooth surfaces of both bevel gears; The assembly platforms are arranged in pairs in a mirror-symmetric manner, and the ballast component is located in the middle of the pair of assembly platforms.

2. The bending fatigue testing device according to claim 1, characterized in that: The mounting platform is provided with mating holes, and the mating holes of the paired mounting platforms are located on the same axis. The mating holes are used to install the shaft part of the bevel gear.

3. The bending fatigue testing device according to claim 2, characterized in that: It also includes two sets of fixing members, which respectively cooperate with two bevel gears. The fixing members pass through the mating holes to fix the bevel gears.

4. The bending fatigue testing device according to claim 3, characterized in that: The fastener is a splined shaft, which includes a spline mating section, an insertion section and a limiting section arranged sequentially along the axial direction; The outer peripheral surface of the spline mating section is provided with spline teeth, which form a circumferential positioning fit with the spline tooth groove on the inner side of the shaft of the bevel gear; The insertion section mates with the mating hole; The outer diameter of the limiting section is larger than the diameter of the mating hole, which is used to limit the axial displacement of the bevel gear.

5. A bending fatigue testing device according to claim 4, characterized in that: The length of the insertion section is less than the length of the mating hole, and the limiting section abuts against the outer end face of the mating table to form an axial fixing structure.

6. The bending fatigue testing device according to claim 1, characterized in that: The ballast component includes a ballast bearing head and two ballast mounting blocks; The two ends of the ballast pressure head are respectively connected to the two ballast mounting blocks to form an inverted U-shaped frame structure. Ballast mating protrusions are provided on the inner sidewalls of both sides of the ballast mounting blocks to contact the tooth surfaces of the bevel gears on both sides.

7. A bending fatigue testing device according to claim 6, characterized in that: The two ballast mounting blocks are symmetrically distributed about the central axis of the ballast pressure head.

8. A bending fatigue testing device according to claim 6, characterized in that: The contact surface of the ballast fitting protrusion is an arc-shaped surface adapted to the tooth surface of the bevel gear.

9. A test system comprising a bending fatigue testing device as claimed in any one of the claims 1-8, characterized in that It also includes a fixed platform and a pressure driving component, wherein the base is fixedly mounted on the fixed platform, and the pressure driving component is connected to the ballast component.

10. A test system according to claim 9, wherein, It also includes a data acquisition device, which is communicatively connected to the bending fatigue testing device to obtain test data, wherein the test data includes at least the driving parameters of the pressure-applying drive component.

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