Shape modification method for tooth surface of spiral bevel gear

Abstract

The invention provides a modification method for a tooth surface of a spiral bevel gear, which comprises the following steps: designing the tooth surface based on a first design parameter of the gear to obtain an initial impression; static impression analysis and shape modification are carried out on the initial impression to obtain a modified initial impression meeting the static impression requirement; modeling the gear based on second design parameters of the modified initial imprint to obtain a dynamic imprint and a transmission error, wherein the second design parameters comprise the first design parameters and machining parameters; the dynamic imprint and the transmission error are analyzed, and the dynamic imprint is shaped to obtain a shaped dynamic imprint meeting the strength requirement and the dynamic performance requirement; machining the gear based on at least a modified second design parameter of the modified dynamic impression, wherein the modified second design parameter includes the first design parameter and a modified machining parameter; performing a static impression test on the machined gear to obtain a test impression; and comparing the test imprint to the initial imprint, further adjusting the modified processing parameters such that both coincide.

Description

Technical Field

[0001] The present invention relates to the field of spiral bevel gear design, and more specifically, to a modification method for the tooth surface of a spiral bevel gear. Background Art

[0002] Spiral bevel gears have the advantages of large contact ratio, smooth transmission, and strong load-carrying capacity, and are used in the central transmission gearbox (IGB) and transfer transmission gearbox (TGB) of the transmission system in the field of aero-engines. The meshing quality of spiral bevel gears directly affects the load-carrying capacity and vibration performance of the system. In engineering, dynamic tooth contact pattern and transmission error are used as important indicators to measure the meshing performance of gears, and the peak-to-peak value of the load transmission error curve can also reflect the vibration performance of the gear pair. Therefore, designing the dynamic tooth contact pattern of the spiral bevel gear and analyzing it in combination with the transmission error of the gear pair are of great significance for guiding the design of the load-carrying capacity and vibration performance of the spiral bevel gear system.

[0003] Traditional tooth contact pattern design can only be mainly based on machining, aiming to approximately meet the design requirements, determining the machining parameters, and then verifying whether the design requirements are met according to the machined tooth surface, passively selecting the tooth surface shape, which belongs to "passive design". This method has certain subjectivity, ambiguity, and uncertainty, greatly relying on experience and cannot meet the performance requirements of gear transmission. Based on the above problems, the active design method of tooth contact pattern has emerged. The active design of tooth contact pattern means that under the goals of strength and dynamic performance, first determine the optimal contact tooth contact pattern and transmission error of the gear under actual working conditions, and then design a tooth surface and corresponding machining method that can precisely meet the above conditions. The active design technology of tooth contact pattern designs the shape parameters of the tooth surface according to the functional requirements of gear transmission, which is of great significance for both the theoretical development and practical application of gear transmission technology. In addition, under actual working conditions, due to the influence of factors such as gear machining errors, installation errors, and system deformation under load, the tooth contact pattern will deviate from the theoretical design position. Severe deviation of the tooth contact pattern will cause abnormal meshing phenomena such as edge contact, resulting in strong vibration and noise of the gear, and the current tooth contact pattern design has not studied these factors in the tooth surface design stage. Summary of the Invention

[0004] The following Summary of the Invention is provided to introduce some concepts that will be further described in the detailed description below in a simplified form. The Summary of the Invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to help determine the scope of the claimed subject matter.

[0005] One of the objectives of the present invention is to provide a method for the active design of the tooth surface contact pattern of spiral bevel gears. This method first conducts a preliminary tooth surface design and a static contact zone simulation for the spiral bevel gear based on the preliminary design parameters of the spiral bevel gear; then, by introducing the operating conditions, errors, etc., a gear system-level model is established to obtain the dynamic contact pattern and transmission error of the gear pair; based on the dynamic contact pattern and transmission error, tooth surface modification is carried out to obtain a contact pattern that meets the strength and dynamic performance requirements; finally, taking the machining contact pattern under these machining parameters as the design requirement, a tooth surface of the bevel gear and the corresponding machining method that can accurately meet the above conditions are designed, and compared and verified with the measured static contact pattern, thereby realizing the active design of the tooth surface contact pattern. The invention fully considers the timeliness and feasibility of the tooth surface contact pattern design of spiral bevel gears, highly faithfully simulates their actual working conditions, the analysis results are reliable, and it has strong engineering applicability.

[0006] According to one aspect of the present disclosure, a method for modifying the tooth surface of a spiral bevel gear is provided, including: conducting a tooth surface design based on the first design parameters of the spiral bevel gear to obtain an initial contact pattern; performing a static contact pattern analysis on the initial contact pattern, and in the case where it is determined that the initial contact pattern does not meet the static contact pattern requirements, modifying the initial contact pattern to obtain a modified initial contact pattern that meets the static contact pattern requirements; modeling the spiral bevel gear based on the second design parameters of the modified initial contact pattern to obtain a dynamic contact pattern and a transmission error, where the second design parameters include the first design parameters and machining parameters; analyzing the dynamic contact pattern and the transmission error, and in the case where it is determined that the dynamic contact pattern or the transmission error does not meet the strength requirements or the dynamic performance requirements, modifying the dynamic contact pattern to obtain a modified dynamic contact pattern that meets the strength requirements and the dynamic performance requirements; machining the spiral bevel gear at least based on the modified second design parameters of the modified dynamic contact pattern, where the modified second design parameters include the first design parameters and the modified machining parameters; performing a static contact pattern test on the machined spiral bevel gear to obtain a test contact pattern; and comparing the test contact pattern with the initial contact pattern, and further adjusting the modified machining parameters so that the test contact pattern is consistent with the initial contact pattern.

[0007] In one embodiment of the present disclosure, the first design parameters include the following parameters: number of teeth, module, pressure angle, tooth width, and shaft angle.

[0008] In another embodiment of the present disclosure, conducting a tooth surface design based on the first design parameters of the spiral bevel gear includes: setting the gear type as a spiral bevel gear, the machining method as the five-cut method, the tooth surface machining using face milling, generating machining for the large gear, and ratio machining for the small gear, using standard tools, the tooth surface being finish grinding, and setting the cutter radius and the tooth side clearance.

[0009] In another embodiment of the present disclosure, the static contact pattern requirements include that when the static contact pattern is adjusted to contact at the smaller end, the static contact pattern occupies 40% to 60% of the tooth height and tooth length of the spiral bevel gear.

[0010] In another embodiment of the present disclosure, modifying the initial imprint includes adjusting the length, width, and inclination of the tooth surface contact imprint.

[0011] In another embodiment of the present disclosure, modeling the spiral bevel gear based on the second design parameters of the modified initial imprint to obtain the dynamic imprint and transmission error further includes: exporting the second design parameters of the modified initial imprint from GEMS software to MASTA software; establishing models of the gear shaft, bearings, and housing based on the second design parameters, and establishing a system-level model of the spiral bevel gear system according to the models of the gear shaft, bearings, and housing; setting the bearing clearance and machining error, applying the working load to the system-level model of the spiral bevel gear, performing LTCA analysis, and obtaining the dynamic imprint and transmission error.

[0012] In a further embodiment of the present disclosure, the bearing clearance includes the axial clearance of the ball bearing and the radial clearance of the rod bearing.

[0013] In another embodiment of the present disclosure, modifying the dynamic imprint includes: adjusting the length, width, and inclination of the tooth surface contact imprint; and modifying the machining parameters to finely adjust the dynamic imprint until a modified dynamic imprint that meets the requirements of the static imprint, as well as the strength requirements and dynamic performance requirements, is obtained.

[0014] In another embodiment of the present disclosure, machining the spiral bevel gear based at least on the modified second design parameters of the modified dynamic imprint further includes: setting the machine tool model and cutting speed; machining the spiral bevel gear based on the modified second design parameters, the machine tool model, and the cutting speed; and measuring the 45-point coordinate values of the tooth surface of the machined spiral bevel gear to determine a spiral bevel gear that meets the tooth surface machining requirements.

[0015] In another embodiment of the present disclosure, the test imprints include: a machining imprint, which is an imprint obtained by coloring and inspecting the machined spiral bevel gear on a gear rolling tester; and an assembly imprint, which is an imprint obtained by coloring and inspecting the tooth surface of the machined spiral bevel gear after installing the machined spiral bevel gear with other components.

[0016] In another embodiment of the present disclosure, the test imprint being consistent with the initial imprint includes: the errors of the lengths of the colorless trace segments at the small ends of the teeth, the lengths of the color traces along the tooth length, the lengths of the colorless trace segments at the tooth tips, the effective working tooth height at the midpoint of the tooth tip, and the heights of the color traces along the tooth height between the test imprint and the initial imprint are all less than 10%.

[0017] These and other features and advantages will become apparent by reading the following detailed description and referring to the associated drawings. It should be understood that the foregoing general description and the following detailed description are illustrative only and do not limit the various aspects claimed. Brief Description of the Drawings

[0018] In order to understand the manner in which the above-described features of the present invention can be used in detail, the above-briefly summarized content can be described more specifically with reference to the various embodiments, some aspects of which are shown in the drawings. However, it should be noted that the drawings only show some typical aspects of the present invention and should not be considered as limiting its scope, because the description may allow other equally effective aspects.

[0019] Figure 1 is a flowchart of a tooth surface modification method for spiral bevel gears according to an embodiment of the present invention.

[0020] Figure 2 is a flowchart of a tooth surface modification method for spiral bevel gears using GEMS software and MASTA software according to an embodiment of the present invention.

[0021] Figure 3 is a simulation diagram of the static analysis impression of a spiral bevel gear according to an embodiment of the present invention.

[0022] Figure 4 is a simulation diagram of the dynamic analysis impression of a spiral bevel gear according to an embodiment of the present invention.

[0023] Figure 5a and Figure 5b is a schematic diagram of the transmission error analysis result of a spiral bevel gear according to an embodiment of the present invention.

[0024] Figure 6 is a schematic diagram of the detection of a spiral bevel gear according to an embodiment of the present invention.

[0025] Figures 7a to 7d is a simulation diagram of the static impression comparison of a spiral bevel gear according to an embodiment of the present invention.

[0026] Figures 8a to 8d is a simulation diagram of the active design result of the impression of a spiral bevel gear according to an embodiment of the present invention.

[0027] In the drawings, the drawings are not drawn to actual scale. Detailed Description of the Embodiments

[0028] The embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although some embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not used to limit the protection scope of the present disclosure.

[0029] In the description of the present disclosure, it should be noted that unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present disclosure. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0030] The orientation terms appearing in the following description are all the directions shown in the figures and do not limit the specific structure of the present disclosure. In the description of the present disclosure, it should also be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0031] Referring to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present disclosure. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0032] In the description of the embodiments of the present disclosure, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0033] Figure 1 is a flowchart of a tooth surface modification method for spiral bevel gears according to an embodiment of the present invention. As Figure 1 shown, in step 102, a tooth surface design can be performed based on the first design parameters of the spiral bevel gear to obtain an initial contact pattern. Among them, the first design parameters can include, for example, parameters such as the number of teeth, module, pressure angle, tooth width, and shaft angle.

[0034] In a non - restrictive embodiment, the tooth surface design in step 102 may include setting the gear type as spiral bevel gear, the machining method as the five - cutter method, the tooth surface machining using face milling, generating machining for the large gear, and rolling ratio machining for the small gear, using standard cutters, the tooth surface being finish - ground, and setting the cutter head radius and tooth flank clearance, etc.

[0035] In step 104, a static impression analysis can be performed on the initial impression, and in the case where the initial impression does not meet the static impression requirements, the initial impression is modified to obtain a modified initial impression that meets the static impression requirements. Among them, the static impression requirements may mean that when the static impression is adjusted to the small - end contact, the static impression occupies 40% to 60% of the tooth height and tooth length of the spiral bevel gear. And modifying the initial impression in the case where the initial impression does not meet the static impression requirements may include adjusting the length, width, and inclination degree of the tooth surface contact impression.

[0036] In step 106, a model of the spiral bevel gear can be built based on the second design parameters of the modified initial impression to obtain the dynamic impression and transmission error, where the second design parameters may include the first design parameters and machining parameters.

[0037] Specifically, the second design parameters of the modified initial impression can be exported from GEMS software to MASTA software, a gear shaft, bearings, and housing model are built based on the second design parameters, and a spiral bevel gear system - level model is built according to the gear shaft, bearings, and housing model, the bearing clearances and machining errors are set, and a working load is applied to the spiral bevel gear system - level model for LTCA analysis, so as to obtain the dynamic impression and transmission error. Among them, the bearing clearances may include the axial clearance of the ball bearing and the radial clearance of the rod bearing.

[0038] In step 108, the dynamic impression and transmission error can be analyzed, and in the case where the dynamic impression or transmission error does not meet the strength requirements or dynamic performance requirements, the dynamic impression is modified to obtain a modified dynamic impression that meets the strength requirements and dynamic performance requirements.

[0039] Specifically, the length, width, and inclination degree of the tooth surface contact impression can be adjusted, and the machining parameters are modified to finely adjust the dynamic impression until a modified dynamic impression that meets the static impression requirements, as well as the strength requirements and dynamic performance requirements, is obtained.

[0040] In step 110, the spiral bevel gear can be machined at least based on the modified second design parameters of the modified dynamic impression, where the modified second design parameters include the first design parameters and the modified machining parameters.

[0041] Specifically, the machine tool model and cutting speed can be set. Then, based on the modified second design parameters, machine tool model, and cutting speed, the spiral bevel gear is machined, and 45-point coordinate value measurement is performed on the tooth surface of the machined spiral bevel gear to determine a spiral bevel gear that meets the tooth surface machining requirements.

[0042] In step 112, a static imprint test can be performed on the machined spiral bevel gear to obtain a test imprint. Among them, the obtained test imprint can include a machining imprint and an assembly imprint. The machining imprint is the imprint obtained by coloring and inspecting the machined spiral bevel gear on a gear rolling inspection machine, while the assembly imprint is the imprint obtained by coloring and inspecting the tooth surface of the machined spiral bevel gear after it is installed with other components.

[0043] In step 114, the test imprint can be compared with the initial imprint, and the modified machining parameters can be further adjusted to make the test imprint consistent with the initial imprint. Among them, the test imprint being consistent with the initial imprint can mean that the errors in the length of the colorless trace segment at the small end of the tooth, the length of the color trace along the tooth length, the length of the colorless trace segment at the tooth tip, the effective working tooth height at the midpoint of the tooth tip, and the height of the color trace along the tooth height between the test imprint and the initial imprint are all less than 10%.

[0044] Figure 2 Shows a specific embodiment of implementing the tooth surface modification method for spiral bevel gears as described in Figure 1 through GEMS software and MASTA software.

[0045] As Figure 2 shown, in step 202, based on the preliminary design parameters of the spiral bevel gear (i.e., Figure 1 the first design parameters in

[0046] ), the tooth surface preliminary design can be performed in GEMS software to obtain an initial imprint. Among them, the preliminary design parameters of the spiral bevel gear can refer to macroscopic parameters such as the number of teeth, module, pressure angle, tooth width, and shaft intersection angle. The tooth surface preliminary design can include setting the gear type as a spiral bevel gear, the machining method as the five-cut method, the tooth surface machining using face milling, generating machining of the large wheel, and rolling ratio machining of the small wheel, using a standard tool, initially determining the cutter head radius, finishing the tooth surface by grinding, and giving the tooth side clearance according to the design requirements.Figure 3 Shows the topography of an exemplary static imprint, which respectively reflects the profile modification position, the static imprint position, and the transmission error curve of the imprint from top to bottom. By analysis (mainly through the static imprint positions in the middle two), it can be determined that the imprint meets the static imprint requirements, and then it can proceed to step 208.

[0047] Conversely, if it is found through the initial analysis of the static imprint that the designed imprint does not meet the static imprint requirements, it proceeds to step 250. The length, width, and inclination of the tooth surface contact imprint are adjusted through the TCA modification module, and then the initial analysis of the static imprint is performed again. Specifically, adjusting the length, width, and inclination of the tooth surface contact imprint through the TCA modification module can include adjusting the blade angle, contact length coefficient, and profile coefficient (Kp), etc. to change the length and width of the contact imprint. After adjustment, it is found that generally, the positive and negative adjustment of the blade angle does not exceed 1°, the value of the contact area length coefficient is controlled within 0.35 - 0.5, and the Kp value is generally 2 - 6. Then, the inclination of the imprint is controlled by adjusting the basic factor, the amplitude of the transmission error is controlled by adjusting the profile separation coefficient, the movement of the imprint in the tooth length direction is controlled by adjusting the contact position coefficient, and the movement of the imprint in the tooth height direction is controlled by adjusting the offset distance. This process is repeated until a modified initial imprint that meets the static imprint requirements is obtained, and then it can proceed to step 208.

[0048] In step 208, that is, after meeting the static imprint requirements, the bevel gear design parameters (i.e., Figure 1 the second design parameters in, which include the first design parameters and the machining parameters obtained during the tooth surface design process in the GEMS software) are exported from the GEMS software to the MASTA software to achieve precise modeling of the tooth surface. For example, an.xml file can be exported from the GEMS software data output module and then imported at Gleason GEMS XML Data in the MASTA software. Then specifically, a gear shaft, bearings, and housing models can be established in the MASTA software, and considering the meshing action of the gear pair and the supporting actions of the bearings and housing, etc., a spiral bevel gear system-level model is established.

[0049] In step 210, the bearing clearance and machining error can be set, a working load can be applied to the gear system, and then LTCA analysis can be performed in MASTA software to obtain the dynamic imprint and transmission error. Analyze the two to determine whether they meet the strength and dynamic performance requirements (step 212). Among them, the bearing clearance can include the axial clearance of the ball bearing and the radial clearance of the rod bearing. The machining error is random, but the error range is affected by the system dimensional chain, which is mainly reflected in the force transmission path of the casing, shaft and bearing mounting surface. Therefore, the maximum machining error can be given by the tolerance value. In addition, the strength and dynamic performance requirements mean that in terms of strength, the imprint area in each working state is required to be large to facilitate the tooth surface load distribution. The dynamic performance is measured by the transmission error, that is, it is required that the peak-to-peak value of the transmission error amplitude is small, and the excitation of the first harmonic frequency after Fourier transform dominates, and the amplitudes of the harmonic frequencies and other sub-frequencies are low. The specific values can be determined according to the working environment and specific batches.

[0050] Figure 4 Fig. 4 shows a simulation diagram of the dynamic analysis imprint of an exemplary spiral bevel gear. It can be seen that it does not meet the requirement that the dynamic imprint is in the middle of the tooth surface, resulting in stress concentration at the tooth root and not meeting the strength requirement. Fig. 5 shows an exemplary transmission error curve of a spiral bevel gear and its FFT diagram. It can be seen that it meets the dynamic performance requirements.

[0051] For the judgment in step 212, if the dynamic imprint and the transmission error both meet the strength and dynamic performance requirements, proceed to step 214. Conversely, as Figure 4 shown in Fig. 4 and Fig. 5, as long as one of them does not meet the requirements, that is, does not meet the strength requirement, or does not meet the dynamic performance requirement, or does not meet the strength and dynamic performance requirements, proceed to step 252.

[0052] In step 252, the tooth surface that does not meet the dynamic imprint is modified. Specifically, the length, width and inclination of the tooth surface contact imprint can be adjusted again through the TCA modification module in GEMS software, and the imprint can be fine-tuned through the ease-off modification module in GEMS software. For example, the ease-off modification module can mainly achieve fine-tuning in all directions of the imprint, including the length value and the movement of the imprint towards the large and small ends, the width value and the movement of the imprint towards the tooth tip and tooth root, the skew angle, etc. However, this modification method is prone to generate deformed teeth, so the tooth profile needs to be closely monitored during the modification process. Perform the operations from step 204 to step 212 on the adjusted tooth surface again until a modified dynamic imprint that meets the strength requirement and dynamic performance requirement is obtained, and then proceed to step 214.

[0053] In step 214, the tooth surface parameters can be determined, that is Figure 1The modified second design parameter of the medium-modified dynamic imprint. The tooth surface parameters can include preliminary design parameters and modified machining parameters, where the modified machining parameters are the machining parameters adjusted by GEMS software. Then, the machining method is further set, and the setting can include the machine tool model, cutting speed, etc.

[0054] In step 216, the gear can be machined according to the above settings. In a further non-limiting example, the machined tooth surface can also be measured for 45 coordinate values to determine whether the tooth surface machining meets the accuracy requirements (step 218). Specifically, the 45-point coordinate value measurement can refer to taking points on the machined tooth surface, with a total of 9 columns from the small end to the large end and 5 rows from the tooth tip to the tooth root. The accuracy requirements can require that all deviations are less than the maximum allowable deviation for each point. For example, the accuracy requirements can be preset as needed, and the coordinate deviation values can be analyzed to determine whether the tooth surface machining meets the preset accuracy requirements. For gears that do not meet the preset accuracy requirements, return to step 216 for reprocessing. When ensuring that the tooth surface of the machined gear meets the accuracy requirements, proceed to step 220.

[0055] In step 220, a static imprint test can be performed on the machined gear to obtain the machining imprint and the assembly imprint (i.e., the test imprint in Figure 1 ). Among them, the machining imprint can refer to the imprint obtained by coloring and inspecting on a gear rolling inspection machine (meshing machine) after the gear machining is completed, and the assembly imprint can refer to the imprint obtained by coloring and inspecting on the tooth surface after all components such as the gear, bearing, and casing are installed.

[0056] In step 222, the measured test imprints (i.e., the machining imprint and the assembly imprint obtained in step 220) and the simulated analysis imprints (i.e., the initial imprints obtained in step 202) can be compared to determine whether they are consistent. If the imprint consistency is met, the active design method for the tooth surface imprint is completed. Specifically, as Figure 6 shown, meeting the imprint consistency can mean that the lengths A of the colorless trace segments at the small ends of the teeth, the lengths B of the color traces along the tooth length, the lengths C of the colorless trace segments at the tooth tips, the effective working tooth height H at the midpoint of the tooth tip, and the heights h of the color traces along the tooth height of the test imprints and the simulated analysis imprints have a mean error of less than 10%. For example, Figures 7a to 7d shows an exemplary static imprint morphology of the test imprint and the initial imprint, where Figure 7a and Figure 7b show the static imprints of the measured large and small wheels, while Figure 7c and Figure 7d show the static imprints of the simulated large and small wheels, indicating that it can meet the consistency of the static imprints.

[0057] Conversely, if it is found through comparison that the test imprint and the initial imprint do not meet the consistency requirement, return to step 214 to check the simulation model, correct the processing method, and control the assembly error to ensure the consistency between the measured test imprint and the designed imprint obtained in step 202, thereby implementing the active design method for the tooth surface imprint. Specifically, checking the simulation model may include, for example, checking whether the simulation model is consistent with the test, whether the working load is consistent, whether the processing error is accurate, and whether the assembly error is introduced into the model. Correcting the processing method may include, for example, adjusting the processing accuracy and processing procedures. Controlling the assembly error may include, for example, ensuring that each assembly error is within the design requirements, and stricter requirements can be imposed. For example, Figures 8a to 8d the results of the active design of the imprint shown (wherein, Figure 8a and Figure 8b explicit the dynamic imprints of the measured large and small gears, while Figure 8c and Figure 8d show the dynamic imprints of the simulated large and small gears) show that the initial imprint and the test imprint obtained by simulation are consistent.

[0058] The above describes the tooth surface modification method for spiral bevel gears of the present invention. On the one hand, this method designs the tooth surface of the bevel gear based on the simulation results of the dynamic imprint and the transmission error, which can solve the problem of the traditional bevel gear passively selecting the tooth surface shape. On the one hand, the analysis model established by this method takes into account the casing, bearings, and various errors, which can solve the problem that the compliance between the processing, assembly, and dynamic imprints and the ideal design imprint is poor due to the processing error of the spiral bevel gear, the processing error of the related support components, the system assembly error, and the system load deformation. On the other hand, this method designs the tooth surface based on the GEMS software, fully considering the feasibility of gear processing, which can solve the problem that the tooth surface established based on the self-derived formula is too theoretical and does not have processability and does not meet the engineering actual requirements. In addition, this method also fully considers the timeliness and economy of gear design, and completes the structural adjustment before the vibration test to save engineering costs.

[0059] Compared with the solutions in the prior art, the present invention has at least the following advantages:

[0060] (1) It provides a method for designing the tooth surface of a bevel gear based on the simulation results of the dynamic imprint and the transmission error, solves the problem of the traditional bevel gear passively selecting the tooth surface shape, and ensures that the strength and dynamic performance of the bevel gear tooth surface meet the requirements during the design stage.

[0061] (2) It establishes an analysis model considering the processing error of the spiral bevel gear, the processing error of the related support components, the system assembly error, and the system load deformation, solves the problem of poor compliance between the measured imprint and the ideal design imprint, and ensures that the simulation analysis can effectively support the subsequent test and provides ideas for structural optimization.

[0062] (3) The tooth surface design is carried out based on GEMS software, fully considering the feasibility of gear machining, solving the problem that the tooth surface deviation theory established based on the self-derived formula is not machinable and does not meet the engineering actual requirements, and applying theoretical analysis to engineering practice.

[0063] (4) The timeliness and economy of gear design are also fully considered, and the structural adjustment is completed before the vibration test, thus saving engineering costs.

[0064] The above-described content includes examples of various aspects of the claimed subject matter. Of course, it is not possible to describe every conceivable combination of components or methods for the purpose of depicting the claimed subject matter, but those of ordinary skill in the art should recognize that many further combinations and permutations of the claimed subject matter are possible. Thus, the disclosed subject matter is intended to cover all such alterations, modifications, and variations that fall within the spirit and scope of the appended claims.

Claims

1. A method for modifying the tooth surface of a spiral bevel gear, characterized in that: include: Designing the tooth surface based on the first design parameter of the spiral bevel gear to obtain an initial impression; Performing a static impression analysis on the initial impression, and if it is determined that the initial impression does not meet the static impression requirement, modifying the initial impression to obtain a modified initial impression that meets the static impression requirement; Modeling the spiral bevel gear based on second design parameters of the modified initial impression to obtain a dynamic impression and a transmission error, wherein the second design parameters include the first design parameters and a processing parameter; Analyzing the dynamic imprint and the transmission error, and if it is determined that the dynamic imprint or the transmission error does not meet the strength requirement or the dynamic performance requirement, modifying the dynamic imprint to obtain a modified dynamic imprint that meets the strength requirement and the dynamic performance requirement; machining the spiral bevel gear based at least on modified second design parameters of the modified dynamic impression, wherein the modified second design parameters include the first design parameters and modified machining parameters; Conducting a static impression test on the processed spiral bevel gear to obtain a test impression; as well as The trial print is compared to the initial print, and the modified processing parameters are further adjusted to make the trial print consistent with the initial print.

2. The method according to claim 1, characterized in that The first design parameters include the following parameters: number of teeth, module, pressure angle, tooth width, and shaft angle.

3. The method according to claim 1, characterized in that Designing the tooth surface based on the first design parameter of the spiral bevel gear includes: Set the gear type to spiral bevel gear, the processing method to five-cut method, the tooth surface processing adopts face milling, large wheel expansion processing, small wheel rolling ratio processing, use standard tools, tooth surface for fine grinding, and set the cutter head radius and tooth side clearance.

4. The method according to claim 1, characterized in that The static footprint requirement includes that when the static footprint is adjusted to the small end contact, the static footprint accounts for 40% to 60% of the tooth height and tooth length of the spiral bevel gear.

5. The method according to claim 1, characterized in that Modifying the initial impression includes adjusting the length, width and inclination of the tooth surface contact impression.

6. The method according to claim 1, characterized in that Modeling the spiral bevel gear based on the second design parameters of the modified initial impression to obtain a dynamic impression and a transmission error further comprises: Exporting the second design parameters of the modified initial impression from GEMS software to MASTA software; Establishing a gear shaft, a bearing and a casing model based on the second design parameter, and establishing a spiral bevel gear system-level model according to the gear shaft, the bearing and the casing model; The bearing clearance and the machining error are set, and a working load is applied to the spiral bevel gear system-level model, and an LTCA analysis is performed to obtain the dynamic imprint and the transmission error.

7. The method according to claim 6, characterized in that The bearing clearance includes the axial clearance of the ball bearing and the radial clearance of the rod bearing.

8. The method according to claim 1, characterized in that The shaping of the dynamic imprint comprises: Adjust the length, width and inclination of the tooth contact patch; and The processing parameters are modified to fine-tune the dynamic impression until a modified dynamic impression is obtained that meets the static impression requirements, as well as the strength requirements and the dynamic performance requirements.

9. The method according to claim 1, characterized in that Machining the spiral bevel gear based at least on the modified second design parameters of the modified dynamic impression further comprises: Set the machine model and cutting speed; machining the spiral bevel gear based on the modified second design parameter, the machine tool model, and the cutting speed; and The 45-point coordinate value measurement of the tooth surface of the processed spiral bevel gear is carried out to determine whether the spiral bevel gear meets the tooth surface processing requirements.

10. The method according to claim 1, characterized in that The test traces include: Machined marks, where the machined marks are traced by coloring and inspecting the processed spiral bevel gear on a gear rolling inspection machine; and The assembly mark is the mark traced by coloring and checking the tooth surface of the processed spiral bevel gear after the processed spiral bevel gear is installed with other components.

11. The method according to claim 1, characterized in that The test impression is consistent with the initial impression including: The errors between the test mark and the initial mark in the length of the colorless section at the small end of the tooth, the length of the color mark along the tooth length, the length of the colorless section at the tooth top, the effective working tooth height at the midpoint of the tooth top and the height of the color mark along the tooth height are all less than 10%.

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