Gearbox weak shaft position analysis method, optimization design method and gearbox

Abstract

The present application relates to the technical fields of gearbox design analysis, and discloses a gearbox weak shaft position analysis method, an optimization design method and a gearbox. The gearbox weak shaft position analysis method comprises the following steps: three-dimensional modeling of a fixed shaft gearbox; calculating the radial displacement of each transmission shaft of the fixed shaft gearbox under each working condition, and determining whether the transmission shaft with the maximum radial displacement among all the radial displacements is a weak shaft I; calculating the gear pair misalignment amount of each gear pair of the fixed shaft gearbox under each working condition, and determining the maximum gear pair misalignment amount, and determining whether the transmission shaft with the greatest contribution amount to the gear pair misalignment amount among the contribution factors of the maximum gear pair misalignment amount is a weak shaft II; and determining whether the gearbox has a weak shaft according to the judgment result of step two and the judgment result of step three. The radial displacement of each transmission shaft and the misalignment amount of the gear pair of the gearbox under different working conditions are considered, and the accuracy of the weak shaft position analysis of the gearbox is improved.

Description

Technical Field

[0001] This invention relates to the field of gearbox design and analysis technology, and in particular to a method for analyzing the location of weak shafts in a gearbox, an optimization design method, and a gearbox. Background Technology

[0002] In contrast to planetary gearboxes, where the planetary gear shafts rotate with the sun gear, all clutch shafts in a fixed-shaft gearbox are fixed to the housing and their positions do not change.

[0003] Fixed-shaft gearboxes are commonly used in construction machinery. As a crucial component of the transmission system, the gearbox's performance directly impacts the reliability of the machinery. The shafts within the gearbox bear various loads during operation, making their reliability paramount for both the gearbox and the construction machinery itself.

[0004] In the traditional gearbox design process, the design and verification of the shaft mainly refer to existing products or empirical formulas. However, this design method is relatively rough and does not take into account the overall load deformation of the gearbox. Summary of the Invention

[0005] The purpose of this invention is to propose a method for analyzing the location of weak shafts in a gearbox, an optimization design method, and a gearbox. This method not only considers the overall deformation of the gearbox under different operating conditions and the radial displacement of each drive shaft, but also the distribution of misalignment of the gear pairs. It eliminates the need for complex formula calculations, simplifies the analysis process, and allows for intuitive analysis of the location of weak shafts in the gearbox.

[0006] To achieve this objective, the present invention employs the following technical solution:

[0007] A method for analyzing the location of a weak shaft in a transmission, wherein the transmission is a fixed-shaft transmission, includes the following steps:

[0008] Step 1: Create a 3D model of the fixed-shaft gearbox;

[0009] Step 2: Calculate the radial displacement of each drive shaft of the fixed-shaft gearbox under each working condition, and determine whether the drive shaft with the largest radial displacement among all the radial displacements is the weak shaft I.

[0010] Step 3: Calculate the gear pair misalignment of each pair of gears in the fixed-shaft gearbox under each working condition and determine the maximum gear pair misalignment. Determine whether the drive shaft containing the factor that contributes the most to the gear pair misalignment among the contributing factors of the maximum gear pair misalignment is the weak shaft II.

[0011] Step 4: Determine whether there is a weak shaft in the gearbox based on the judgment results of Step 2 and Step 3.

[0012] As a preferred technical solution of the above-mentioned gearbox weak shaft location analysis method, determining whether the drive shaft containing the largest radial displacement among all the radial displacements is the weak shaft I includes:

[0013] Determine the maximum radial displacement among all the stated radial displacements;

[0014] Determine whether the maximum radial displacement is greater than a preset radial displacement limit value;

[0015] If the maximum radial displacement is greater than the preset radial displacement limit value, then the transmission shaft where the maximum radial displacement is located is determined to be the weak shaft I;

[0016] If the maximum radial displacement is not greater than the preset radial displacement limit value, then it is determined that there is no weak shaft I.

[0017] As a preferred technical solution for the above-mentioned weak shaft location analysis method for gearboxes, determining whether the drive shaft containing the largest contributing factor to the gear pair misalignment among the contributing factors is weak shaft II includes:

[0018] Determine whether the maximum gear pair misalignment is greater than the preset contribution limit value;

[0019] If the maximum gear pair misalignment is greater than the preset contribution limit value, then the transmission shaft containing the contribution factor that contributes the most to the gear pair misalignment among the contribution factors of the maximum gear pair misalignment is determined to be the weak shaft II.

[0020] If the maximum gear pair misalignment is not greater than the preset contribution limit value, then it is determined that there is no weak shaft II.

[0021] As a preferred technical solution of the above-mentioned weak shaft location analysis method for gearboxes, the transmission shaft containing the largest contributing factor to the gear pair misalignment among the contributing factors of the maximum gear pair misalignment is identified as weak shaft II, including:

[0022] Determine the contributing factors of the maximum gear pair misalignment and the contribution of each contributing factor to the gear pair misalignment;

[0023] Calculate the maximum contribution among all the contributions;

[0024] The transmission shaft containing the contributing factor with the largest contribution amount is identified as the weak shaft II.

[0025] As a preferred technical solution of the above-mentioned weak shaft location analysis method for gearboxes, the contributing factors of the gear pair misalignment include gears, drive shafts and bearings.

[0026] As a preferred technical solution of the above-mentioned method for analyzing the location of a weak shaft in a transmission, determining whether a weak shaft exists in the transmission based on the judgment results of step two and step three includes:

[0027] If the weak shaft I and the weak shaft II are the same transmission shaft, then the weak shaft I is determined to be the weak shaft of the gearbox.

[0028] As a preferred technical solution of the above-mentioned method for analyzing the location of a weak shaft in a transmission, determining whether a weak shaft exists in the transmission based on the judgment results of step two and step three further includes:

[0029] If there is a weak shaft I and there is no weak shaft II, then weak shaft I is the weak shaft of the gearbox.

[0030] If there is no weak shaft I but there is a weak shaft II, then weak shaft II is the weak shaft of the gearbox.

[0031] If there is no weak shaft I and no weak shaft II, then the gearbox has no weak shaft.

[0032] On the other hand, the present invention also provides a method for optimizing the design of a transmission, comprising the following steps:

[0033] The gearbox weak shaft location analysis method described in any of the above schemes is used to determine whether the gearbox has a weak shaft.

[0034] When weak shaft I and weak shaft II are the same transmission shaft, weak shaft I is the weak shaft of the gearbox, and the diameter of the weak shaft of the gearbox is increased.

[0035] As a preferred technical solution of the above-mentioned gearbox optimization design method, the following steps are also included:

[0036] When the weak shaft I and the weak shaft II are not the same transmission shaft, determine the contribution factor of the gear pair misalignment on the weak shaft II to all gear pairs on it under each working condition, and the contribution of each contribution factor to the gear pair misalignment.

[0037] Calculate the maximum contribution among all the contributions, and determine the contributing factor corresponding to the maximum contribution.

[0038] When the contributing factor is determined to be the gear on the weak shaft II, increase the gear stiffness; when the contributing factor is determined to be the bearing on the weak shaft II, increase the bearing load capacity.

[0039] In another aspect, the present invention also provides a gearbox, which is a fixed-shaft gearbox and is formed by optimizing the gearbox using the gearbox optimization design method described in any of the above schemes.

[0040] The beneficial effects of this invention are as follows: The method for analyzing the location of weak shafts in a transmission provided by this invention is applicable to fixed-shaft transmissions. It includes: Step 1: Performing a 3D model of the fixed-shaft transmission; Step 2: Calculating the radial displacement of each drive shaft in the fixed-shaft transmission under each operating condition, and determining whether the drive shaft containing the largest radial displacement is weak shaft I; Step 3: Calculating the gear pair misalignment of each gear pair in the fixed-shaft transmission under each operating condition and determining the largest gear pair misalignment, and determining whether the drive shaft containing the factor contributing the largest contribution to the gear pair misalignment is weak shaft II; Step 4: Determining whether a weak shaft exists in the transmission based on the results of Step 2 and Step 3. This method considers the radial displacement of each drive shaft and the misalignment of gear pairs under different operating conditions, improving the accuracy of weak shaft location analysis in transmissions.

[0041] The gearbox optimization design method and gearbox provided by this invention, by adopting the above-mentioned gearbox weak shaft position analysis method, can effectively ensure that the radial displacement of each drive shaft and the misalignment of each gear pair meet the requirements, thus ensuring the quality of the gearbox and improving the optimization design efficiency of the gearbox. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0043] Figure 1 This is the flowchart of the gearbox weak shaft location analysis method provided in the embodiments of the present invention. Figure 1 ;

[0044] Figure 2 This is the flowchart of the gearbox weak shaft location analysis method provided in the embodiments of the present invention. Figure 2 . Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0046] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0049] In traditional gearbox design, shaft design and verification mainly refer to existing products or empirical formulas. However, this design approach is rather crude and does not consider the overall load-bearing deformation of the gearbox. Therefore, this embodiment provides a method for analyzing the location of weak shafts in a gearbox to address the aforementioned technical problems.

[0050] Figure 1 This is the flowchart of the gearbox weak shaft location analysis method provided in this embodiment. Figure 1 ,like Figure 1 As shown in the figure, the transmission weak shaft location analysis method provided in this embodiment is for a fixed-shaft transmission and is mainly used in construction machinery. The transmission weak shaft location analysis method includes the following steps:

[0051] S1. Perform 3D modeling of the fixed-axis gearbox.

[0052] Specifically, a virtual prototype model of a fixed-axis gearbox is established based on factors such as the gearbox's structural layout, detailed parameters of its parts, housing model, materials, precision, roughness, temperature, lubrication, and operating conditions. Three-dimensional modeling is performed using transmission system analysis software. The specific methods for 3D modeling are existing technologies in this field and will not be described in detail here.

[0053] S2. Calculate the radial displacement of each drive shaft of the fixed-shaft gearbox under each working condition, and determine whether the drive shaft with the largest radial displacement is the weak shaft I.

[0054] The radial displacement of the drive shaft refers to the radial deformation of the drive shaft. As for calculating the radial displacement of each drive shaft of the fixed-shaft gearbox under each operating condition, it is a built-in function of the transmission system analysis software, which is existing technology in this field and will not be described in detail here.

[0055] Specifically, determining whether the drive shaft containing the largest radial displacement among all radial displacements is the weak shaft I includes:

[0056] S21. Determine the maximum radial displacement among all radial displacements;

[0057] S22. Determine whether the maximum radial displacement is greater than the preset radial displacement limit value;

[0058] S23. If the maximum radial displacement is greater than the preset radial displacement limit value, then the transmission shaft where the maximum radial displacement is located is determined to be the weak shaft I.

[0059] S24. If the maximum radial displacement is not greater than the preset radial displacement limit value, then it is determined that there is no weak shaft I.

[0060] S3. Calculate the gear pair misalignment of each pair of gears in the fixed-shaft gearbox under each working condition and determine the maximum gear pair misalignment. Determine whether the drive shaft containing the factor that contributes the most to the gear pair misalignment among the contributing factors of the maximum gear pair misalignment is the weak shaft II.

[0061] The contributing factors to gear pair misalignment include gears, drive shafts, and bearings. Gear pair misalignment refers to the degree of deviation of a gear pair from its ideal meshing position. The contributing factors to gear pair misalignment are the factors that cause the misalignment. The contribution of each contributing factor to the gear pair misalignment is the misalignment caused by that factor, and the gear pair misalignment is equal to the sum of the misalignments caused by all contributing factors.

[0062] As for calculating the gear pair misalignment of each pair of gears in a fixed-shaft gearbox under each operating condition, as well as the contribution of the factors contributing to the gear pair misalignment, this is a built-in function of the transmission system analysis software. This is existing technology in this field and will not be described in detail here.

[0063] Specifically, determining whether the transmission shaft containing the factor contributing the largest amount of gear pair misalignment is the weak shaft II includes:

[0064] S31. Determine whether the maximum gear pair misalignment is greater than the preset contribution limit value;

[0065] S32. If the maximum gear pair misalignment is greater than the preset contribution limit value, then the transmission shaft containing the contribution factor that contributes the most to the gear pair misalignment is determined to be the weak shaft II.

[0066] S33. If the maximum gear pair misalignment is not greater than the preset contribution limit value, then it is determined that there is no weak shaft II.

[0067] Among the factors contributing to the maximum gear pair misalignment, the transmission shaft containing the factor that contributes the most to the gear pair misalignment is designated as weak shaft II, including:

[0068] S321. Determine the contributing factors of the maximum gear pair misalignment and the contribution of each contributing factor to the gear pair misalignment.

[0069] S322. Calculate the maximum contribution among all contributions;

[0070] S323. The transmission shaft containing the contributing factor with the largest contribution is identified as the weak shaft II.

[0071] For example, if the contributing factor to the maximum gear pair misalignment is the final drive gear pair, and the drive shafts where the final drive gear pair is located are the intermediate shaft of the gearbox and the output shaft of the gearbox, the intermediate shaft is the weak shaft II when the contribution of the intermediate shaft to the gear pair misalignment is the largest; and the output shaft is the weak shaft II when the contribution of the output shaft to the gear pair misalignment is the largest.

[0072] S4. Based on the judgment results of S2 and S3, determine whether there is a weak shaft in the gearbox.

[0073] Specifically, the existence of a weak shaft in the transmission is determined based on weak shaft I and weak shaft II, including the following five cases:

[0074] The first scenario is that weak shaft I and weak shaft II are the same drive shaft, thus weak shaft I is identified as the weak shaft of the gearbox.

[0075] The second scenario is that if weak shaft I and weak shaft II are not the same transmission shaft, then the factor causing the maximum gear pair misalignment to exceed the preset contribution limit is the transmission shaft and / or gears and / or bearings.

[0076] The third scenario is that if there is no weak shaft I but there is a weak shaft II, then weak shaft II is the weak shaft of the gearbox.

[0077] Fourthly, if there is a weak shaft I and there is no weak shaft II, then weak shaft I is the weak shaft of the gearbox.

[0078] Fifthly, if there is no weak shaft I and no weak shaft II, then the gearbox has no weak shaft.

[0079] The transmission weak shaft location analysis method provided in this embodiment not only considers the load deformation of the transmission shaft under different working conditions, i.e., the radial displacement of each transmission shaft, but also considers the misalignment distribution of the gear pair. It does not require complex formula calculations, the analysis process is simple, and the location of the transmission weak shaft can be analyzed intuitively, thus improving the accuracy of the transmission weak shaft location analysis.

[0080] Figure 2 This is the flowchart of the gearbox weak shaft location analysis method provided in this embodiment. Figure 2 ,like Figure 2 As shown, the method for analyzing the location of the weak shaft in the gearbox includes the following steps:

[0081] S100: Perform 3D modeling of the fixed-shaft gearbox, then execute S110 and S120;

[0082] S110. Calculate the radial displacement of each drive shaft of the fixed-shaft gearbox under each working condition, and determine the maximum radial displacement among all radial displacements.

[0083] S111. Determine whether the maximum radial displacement is greater than the preset radial displacement limit value. If yes, execute S112; if no, determine that there is no weak shaft I, and then execute S130.

[0084] S112. Determine that the transmission shaft with the maximum radial displacement is the weak shaft I, and then execute S130.

[0085] S120. Calculate the gear pair misalignment of each pair of gears in the fixed-shaft gearbox under each working condition and determine the maximum gear pair misalignment.

[0086] S121. Determine whether the maximum gear pair misalignment is greater than the preset contribution limit value. If yes, execute S122. If no, determine that there is no weak shaft II, and then execute S130.

[0087] S122. Determine the contributing factors of the maximum gear pair misalignment and the contribution of each contributing factor to the gear pair misalignment.

[0088] S123. Calculate the maximum contribution among all contributions, determine the drive shaft where the contributing factor of the maximum contribution is located as the weak shaft II, and then execute S130.

[0089] S130, Identify the weak shaft of the gearbox.

[0090] In S130, the method for identifying the weak shaft of the gearbox is detailed in the five cases in S4.

[0091] This embodiment also provides a gearbox optimization design method, including the following steps: using the above-mentioned gearbox weak shaft location analysis method to determine whether there is a weak shaft in the gearbox; and optimizing the gearbox design based on the determination results.

[0092] Specifically, when weak shaft I and weak shaft II are the same transmission shaft, weak shaft I is determined to be the weak shaft of the gearbox. This indicates that the radial displacement of weak shaft I exceeds the preset radial displacement limit value, and weak shaft I has a significant impact on the misalignment of the gear pair. As a result, the maximum misalignment of the gear pair containing the gear on weak shaft I is greater than the preset contribution limit value. In this case, the diameter of the determined weak shaft is increased, and the above-mentioned gearbox weak shaft position analysis method is used again to determine whether there is a weak shaft in the gearbox. This process continues until there is no weak shaft I and no weak shaft II. At this point, it is considered that there is no weak shaft in the gearbox, or that the impact of the weak shaft on the gearbox is within the allowable error range and is acceptable.

[0093] If weak shaft I and weak shaft II are not on the same drive shaft, then the main factor causing the maximum gear pair misalignment to exceed the preset contribution limit is weak shaft II and / or the gear and / or the bearing. In this situation, the optimization method for the gearbox is as follows:

[0094] S200. Determine the contributing factors of the gear pair misalignment on the weak shaft II to all gear pairs on it under each working condition, and the contribution of each contributing factor to the gear pair misalignment.

[0095] S201. Calculate the maximum contribution among all the contributions determined in S200, and determine the contribution factor corresponding to the maximum contribution.

[0096] S202. When the determined contributing factor is the gear on the weak shaft II, increase the stiffness of the gear corresponding to the maximum contributing amount; when the determined contributing factor is the bearing on the weak shaft II, increase the bearing capacity corresponding to the maximum contributing amount.

[0097] In step S202, after increasing the stiffness of the gear corresponding to the maximum contribution or increasing the bearing capacity of the bearing corresponding to the maximum contribution, the above-mentioned gearbox weak shaft position analysis method is used again to determine whether there is a weak shaft in the gearbox. This process continues until there is no weak shaft I and no weak shaft II. If so, it is considered that there is no weak shaft in the gearbox, or that the influence of the weak shaft on the gearbox is within the allowable error range and is acceptable.

[0098] If there is a weak shaft I and no weak shaft II, then weak shaft I is the weak shaft of the gearbox. In this case, the optimization of the gearbox is the same as the optimization design method when weak shaft I and weak shaft II are the same drive shaft, that is, increasing the diameter of weak shaft II.

[0099] If there is no weak shaft I but there is a weak shaft II, then weak shaft II is the weak shaft of the gearbox. In this case, the optimization of the gearbox is the same as the optimization design method when weak shaft I and weak shaft II are not the same drive shaft, and will not be repeated here.

[0100] The gearbox optimization design method provided in this embodiment uses the aforementioned gearbox weak shaft location analysis method to determine whether there is a weak shaft in the gearbox. This can effectively ensure that the radial displacement of each drive shaft and the misalignment of each gear pair meet the requirements, thus guaranteeing the quality of the gearbox, simplifying the gearbox design, and improving the efficiency of gearbox optimization design.

[0101] This embodiment also provides a gearbox, which is a fixed-shaft gearbox. It is optimized and designed using the gearbox optimization design method described above, thereby improving the quality of the gearbox.

[0102] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for analyzing the location of a weak shaft in a gearbox, wherein the gearbox is a fixed-shaft gearbox, characterized in that... Includes the following steps: Step 1: Create a 3D model of the fixed-shaft gearbox; Step 2: Calculate the radial displacement of each drive shaft of the fixed-shaft gearbox under each working condition, and determine whether the drive shaft with the largest radial displacement among all the radial displacements is the weak shaft I. Step 3: Calculate the gear pair misalignment of each pair of gears in the fixed-shaft gearbox under each working condition and determine the maximum gear pair misalignment. Determine whether the drive shaft containing the factor that contributes the most to the gear pair misalignment among the contributing factors of the maximum gear pair misalignment is the weak shaft II. Step 4: Determine whether there is a weak shaft in the gearbox based on the judgment results of Step 2 and Step 3; Based on the results of step two and step three, determine whether the gearbox has a weak shaft, including: If the weak shaft I and the weak shaft II are the same transmission shaft, then the weak shaft I is determined to be the weak shaft of the gearbox.

2. The method for analyzing the location of a weak shaft in a gearbox according to claim 1, characterized in that, Determining whether the drive shaft containing the maximum radial displacement among all the radial displacements is the weak shaft I includes: Determine the maximum radial displacement among all the stated radial displacements; Determine whether the maximum radial displacement is greater than a preset radial displacement limit value; If the maximum radial displacement is greater than the preset radial displacement limit value, then the transmission shaft where the maximum radial displacement is located is determined to be the weak shaft I; If the maximum radial displacement is not greater than the preset radial displacement limit value, then it is determined that there is no weak shaft I.

3. The method for analyzing the location of a weak shaft in a gearbox according to claim 1, characterized in that, Determining whether the drive shaft containing the factor contributing the largest amount of gear pair misalignment is the weakest shaft II includes: Determine whether the maximum gear pair misalignment is greater than the preset contribution limit value; If the maximum gear pair misalignment is greater than the preset contribution limit value, then the transmission shaft containing the contribution factor that contributes the most to the gear pair misalignment among the contribution factors of the maximum gear pair misalignment is determined to be the weak shaft II. If the maximum gear pair misalignment is not greater than the preset contribution limit value, then it is determined that there is no weak shaft II.

4. The method for analyzing the location of a weak shaft in a gearbox according to claim 3, characterized in that, The transmission shaft containing the factor contributing the largest amount of gear pair misalignment to the maximum gear pair misalignment is identified as the weak shaft II, including: Determine the contributing factors of the maximum gear pair misalignment and the contribution of each contributing factor to the gear pair misalignment; Calculate the maximum contribution among all the contributions; The transmission shaft containing the contributing factor with the largest contribution amount is identified as the weak shaft II.

5. The method for analyzing the location of a weak shaft in a gearbox according to any one of claims 1 to 4, characterized in that, The contributing factors to the gear pair misalignment include the gear, drive shaft, and bearing.

6. The method for analyzing the location of a weak shaft in a gearbox according to any one of claims 1 to 4, characterized in that, Determining whether a weak shaft exists in the gearbox based on the judgment results of step two and step three also includes: If there is a weak shaft I and there is no weak shaft II, then weak shaft I is the weak shaft of the gearbox. If there is no weak shaft I but there is a weak shaft II, then weak shaft II is the weak shaft of the gearbox. If there is no weak shaft I and no weak shaft II, then the gearbox has no weak shaft.

7. A method for optimizing the design of a transmission, characterized in that, Includes the following steps: The method for analyzing the location of a weak shaft in a transmission as described in any one of claims 1 to 6 is used to determine whether a weak shaft exists in the transmission. When weak shaft I and weak shaft II are the same transmission shaft, weak shaft I is the weak shaft of the gearbox, and the diameter of the weak shaft of the gearbox is increased.

8. The gearbox optimization design method according to claim 7, characterized in that, It also includes the following steps: When the weak shaft I and the weak shaft II are not the same transmission shaft, determine the contribution factor of the gear pair misalignment on the weak shaft II to all gear pairs on it under each working condition, and the contribution of each contribution factor to the gear pair misalignment. Calculate the maximum contribution among all the contributions, and determine the contributing factor corresponding to the maximum contribution. When the determined contributing factor is the gear on the weak shaft II, increase the stiffness of the gear corresponding to the maximum contributing amount; when the determined contributing factor is the bearing on the weak shaft II, increase the bearing capacity corresponding to the maximum contributing amount.

9. A gearbox, characterized in that, The gearbox is a fixed-shaft gearbox, which is optimized and designed using the gearbox optimization design method described in claim 7 or 8.

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