A method for adjusting tooth thickness of helical angle modified gear

Abstract

The present invention belongs to the field of gear shaping, and discloses a method for adjusting the tooth thickness of a gear with a helical angle shaping, including calculating the helical angle shaping amount of the gear to be shaped, determining the actual parameters of the gear after the helical angle shaping, calculating the normal tooth thickness of the gear after the helical angle shaping at the original pitch circle; then calculating the normal tooth thickness change amount and the end face tooth thickness change amount of the gear after the helical angle shaping at the original pitch circle, calculating the helical angle shaping slope of the gear after the helical angle shaping at the original pitch circle, calculating the end face tooth thickness of the gear after the helical angle shaping at the original pitch circle; calculating the normal tooth thickness of the gear after the helical angle shaping at the pitch circle after shaping; and determining the tooth thickness data of the gear to be shaped that needs to be adjusted. The tooth thickness of the gear with a helical angle shaping can be quickly adjusted, thereby correcting the gear tooth thickness and adjusting the working side clearance, and avoiding double tooth surface contact of the gear after shaping.

Description

Technical Field

[0001] The invention belongs to the field of gear modification, and in particular relates to a method for adjusting the tooth thickness of a helical angle modified gear. Background Art

[0002] Gear transmission is widely used in many fields such as automobile, wind power, rail transportation, aerospace, etc. After the basic parameters of the gear are determined, gear micro-modification is an effective means to solve the problems of gear noise and fatigue life. In particular, helix angle modification can adjust the gear meshing contact spot to move along the tooth width direction, solve the problem of gear eccentric load, and improve the life of gear transmission.

[0003] The prior art does not have a unified quantitative form when performing helix angle modification on gears. After the helix angle modification, the actual values ​​of the gear's helix angle, pressure angle and base circle will change, causing the gear's working side clearance to decrease. After the gear is deformed under load, the active and passive surfaces will engage with each other and the tooth surfaces will wear rapidly, affecting subsequent work efficiency while posing a safety hazard. Summary of the invention

[0004] The purpose of the present invention is to provide a method for adjusting the tooth thickness of a helical angle modified gear to solve the problem in the prior art that there is a lack of a unified quantitative form when performing helical angle modification on gears, resulting in the modified gears being susceptible to wear.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0006] A method for adjusting tooth thickness of a helical angle modified gear comprises the following steps:

[0007] Step 1: Collect the original parameters of the gear to be modified, including: number of teeth , modulus , pressure angle , Helix Angle , Tooth width , French tooth thickness and helix angle modification slope ;

[0008] Determine two circles of the gear to be modified under original parameters: the original base circle and the original pitch circle;

[0009] Step 2, calculating the helix angle modification amount of the gear to be modified according to the original parameters of the gear to be modified collected in step 1;

[0010] Step 3, according to the original parameters of the gear to be modified collected in step 1 and the helix angle modification amount of the gear to be modified obtained in step 2, determining the actual parameters of the gear after the helix angle modification, including: the helix angle of the gear after the helix angle modification and the pressure angle of the gear after the helix angle modification;

[0011] Step 4, according to the data obtained in step 1 and step 3, calculate the end face tooth thickness of the gear to be modified at the original pitch circle, the helix angle of the gear after helix angle modification at the modified base circle, and the helix angle of the gear after helix angle modification at the original pitch circle;

[0012] Step 5, according to the data obtained in step 4, calculate the normal tooth thickness of the gear after the helix angle modification at the original pitch circle; and then calculate the normal tooth thickness change and the end tooth thickness change of the gear after the helix angle modification at the original pitch circle;

[0013] Step 6, calculating the helix angle modification slope of the gear after the helix angle modification at the original pitch circle according to the data obtained in step 4;

[0014] Step 7, calculating the end face tooth thickness of the gear after the helix angle modification at the original pitch circle according to the data obtained in Steps 5 and 6;

[0015] Step 8, according to the data obtained in step 7, calculate the end face tooth thickness of the gear after the helix angle modification at the modified pitch circle, and then calculate the normal face tooth thickness of the gear after the helix angle modification at the modified pitch circle;

[0016] Step 9, determining the tooth thickness data of the gear to be modified that needs to be adjusted according to the normal tooth thickness of the gear after the helix angle modification in step 8 at the pitch circle after modification.

[0017] The present invention also has the following features:

[0018] Further, in step 2, the helix angle modification amount of the gear to be modified is calculated using the following formula;

[0019]

[0020] in, Indicates the helix angle modification amount of the gear to be modified;

[0021] represents the helix angle;

[0022] Indicates the slope of the helix angle modification;

[0023] Indicates tooth width.

[0024] Further, step 3 includes the following sub-steps;

[0025] Step 31, according to the helix angle modification amount of the gear to be modified, use the following formula to determine the helix angle of the gear after the helix angle modification;

[0026]

[0027] in, Indicates the helix angle of the gear after helix angle modification;

[0028] Step 32, using the following formula, calculate the end face pressure angle of the gear after the helix angle modification;

[0029]

[0030] in, Indicates the end face pressure angle of the gear to be modified under the original parameters;

[0031] Indicates the end face pressure angle of the gear after the helix angle is modified;

[0032] Step 33, using the following formula, calculate the pressure angle of the gear after the helix angle modification;

[0033]

[0034] in, Indicates the pressure angle of the gear after the helix angle is modified.

[0035] Further, step 4 includes the following sub-steps;

[0036] Step 41, using the following formula to calculate the end face tooth thickness of the gear to be modified at the original pitch circle;

[0037]

[0038] in, Indicates the end face tooth thickness of the gear to be modified at the original pitch circle under the original parameters;

[0039] Indicates the original pitch circle;

[0040] Indicates the normal tooth thickness of the gear to be modified;

[0041] Indicates the normal tooth thickness of the gear to be modified at the original pitch circle under the original parameters;

[0042] Indicates the helix angle of the gear to be modified at the original pitch circle under the original parameters;

[0043] Step 42, using the following formula to calculate the end face pressure angle of the gear after the helix angle modification at the original pitch circle;

[0044]

[0045] in, It indicates the end face pressure angle of the gear at the original pitch circle after the helix angle is modified;

[0046] Indicates the diameter of the modified base circle of the gear after the helix angle is modified;

[0047] Step 43, using the following formula to calculate the helix angle of the gear after the helix angle modification at the modified base circle;

[0048]

[0049] in, It indicates the helix angle of the gear after helix angle modification at the modified base circle;

[0050] Indicates the pitch circle of the gear after the helix angle is modified;

[0051] It indicates the helix angle of the gear after helix angle modification at the modified pitch circle;

[0052] It indicates the end face pressure angle of the gear after the helix angle is modified at the modified pitch circle;

[0053] Step 44, using the following formula to calculate the helix angle of the gear after the helix angle modification at the original pitch circle;

[0054]

[0055] in, represents the helix angle of the gear at the original pitch circle after the helix angle modification. Further, step 5 includes the following sub-steps;

[0056] Step 51, according to the end face tooth thickness of the gear to be modified at the original pitch circle and the helix angle of the gear after the helix angle modification at the original pitch circle, the normal face tooth thickness of the gear after the helix angle modification at the original pitch circle is calculated using the following formula;

[0057]

[0058] in, It indicates the normal tooth thickness of the gear at the original pitch circle after the helix angle is modified;

[0059] Step 52, using the following formula to calculate the normal tooth thickness variation of the gear after the helix angle modification at the original pitch circle;

[0060]

[0061] in, It indicates the change of normal tooth thickness at the original pitch circle of the gear after the helix angle is modified;

[0062] Step 53, using the following formula to calculate the change in end face tooth thickness of the gear after the helix angle modification at the original pitch circle;

[0063]

[0064] in, It indicates the change in end face tooth thickness of the gear at the original pitch circle after the helix angle is modified.

[0065] Further, in step 6, according to the helix angle of the gear at the original pitch circle after the helix angle modification, the helix angle modification slope of the gear at the original pitch circle after the helix angle modification is calculated using the following formula;

[0066]

[0067] in, It indicates the helix angle modification slope of the gear after helix angle modification at the original pitch circle.

[0068] Further, in step 7, the end face tooth thickness of the gear after the helix angle modification at the original pitch circle is calculated using the following formula;

[0069]

[0070] in, It indicates the end face tooth thickness of the gear at the original pitch circle after the helix angle is modified;

[0071] It indicates the adjustment amount of tooth thickness change at the original pitch circle caused by helix angle modification. .

[0072] Further, step 8 includes the following sub-steps:

[0073] Step 81, using the following formula to calculate the end face tooth thickness of the gear after the helix angle is modified at the pitch circle after the modification;

[0074]

[0075] in, It indicates the end face tooth thickness of the gear after the helix angle is modified at the pitch circle after modification;

[0076] Step 82, using the following formula to calculate the normal tooth thickness of the gear after the helix angle is modified at the pitch circle after the modification;

[0077]

[0078] in, It indicates the normal tooth thickness of the gear after helix angle modification at the modified pitch circle.

[0079] Furthermore, in step 9, the normal tooth thickness of the gear after the helix angle modification at the pitch circle after modification is the tooth thickness data that needs to be adjusted for the gear to be modified.

[0080] Compared with the prior art, the present invention has the following technical effects:

[0081] The tooth thickness adjustment method after helix angle modification of the present invention takes into account the reduction of gear working side clearance caused by the change of tooth inclination and the influence of the helix angle change on the change of gear tooth thickness; it can quickly adjust the tooth thickness of the helix angle modified gear, thereby correcting the gear tooth thickness and adjusting the working side clearance, avoiding double tooth surface contact of the modified gear, and effectively solving the problem that the modified gear is susceptible to wear, thereby improving subsequent work efficiency and ensuring work reliability, and is suitable for large-scale use and promotion in industry. DETAILED DESCRIPTION

[0082] It should be noted that all parameters in the present invention, unless otherwise specified, are parameters that are well known in the art and can be directly obtained, such as the original base circle and the original pitch circle, and those skilled in the art can calculate them using basic formulas well known in the art.

[0083] In addition, those contents involved in the intermediate steps of the present method that are not specifically described, such as the diameter of the modified base circle of the gear after the helix angle is modified, the modified pitch circle of the gear after the helix angle is modified, the helix angle of the gear after the helix angle is modified at the modified pitch circle, and the end face pressure angle of the gear after the helix angle is modified at the modified pitch circle, can all be calculated by those skilled in the art using basic formulas known in the art.

[0084] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0085] A method for adjusting tooth thickness of a helical angle modified gear comprises the following steps:

[0086] Step 1: Collect the original parameters of the gear to be modified, including: number of teeth , modulus , pressure angle , Helix Angle , Tooth width , French tooth thickness and helix angle modification slope ;

[0087] Determine the original parameters of the gear to be modified: the original base circle and the original pitch circle;

[0088] Step 2, calculating the helical angle modification amount of the gear to be modified according to the original parameters of step 1;

[0089] Step 3, according to the original parameters of step 1 and the helix angle modification amount of the gear to be modified obtained in step 2, determining the actual parameters of the gear after the helix angle modification, including: the helix angle of the gear after the helix angle modification and the pressure angle of the gear after the helix angle modification;

[0090] Step 4: Calculate the original pitch circle of the gear to be modified under the original parameters based on the data obtained in steps 1 and 3. The end face tooth thickness at the modified base circle of the gear after the helix angle modification, and the helix angle of the gear after the helix angle modification at the original pitch circle;

[0091] Step 5, calculating the normal tooth thickness of the gear after the helix angle modification at the original pitch circle according to the data obtained in step 4; and then calculating the normal tooth thickness change and the end tooth thickness change of the gear after the helix angle modification at the original pitch circle;

[0092] Step 6, calculating the helix angle modification slope of the gear after the helix angle modification at the original pitch circle according to the data obtained in step 4;

[0093] Step 7, based on the data obtained in steps 5 and 6, calculate the end face tooth thickness of the gear after the helix angle modification at the original pitch circle;

[0094] Step 8, based on the data obtained in step 7, calculate the end face tooth thickness of the gear after the helix angle modification at the modified pitch circle, and then calculate the normal face tooth thickness of the gear after the helix angle modification at the modified pitch circle.

[0095] Step 9, determining the tooth thickness data of the gear to be modified that needs to be adjusted according to the normal tooth thickness of the gear after the helix angle modification in step 8 at the pitch circle after modification.

[0096] As a specific implementation, in step 2, the helical angle modification amount of the gear to be modified is calculated using the following formula:

[0097]

[0098] in, Indicates the helix angle modification amount of the gear to be modified;

[0099] represents the helix angle;

[0100] Indicates the slope of the helix angle modification;

[0101] Indicates tooth width.

[0102] when When it is positive, it means that the helix angle of the gear after helix angle modification increases;

[0103] when When it is negative, it means that the helix angle of the gear is reduced after the helix angle modification.

[0104] As a specific implementation, step 3 includes the following sub-steps:

[0105] Step 31, according to the helix angle modification amount of the gear to be modified, use the following formula to determine the helix angle of the gear after the helix angle modification;

[0106]

[0107] in, Indicates the helix angle of the gear after helix angle modification;

[0108] Step 32, using the following formula, calculate the end face pressure angle of the gear after the helix angle modification;

[0109]

[0110] in, Indicates the end face pressure angle of the gear after the helix angle is modified;

[0111] Indicates the end face pressure angle of the gear to be modified under the original parameters;

[0112] Step 33, using the following formula, calculate the pressure angle of the gear after the helix angle modification;

[0113]

[0114] in, Indicates the pressure angle of the gear after the helix angle is modified.

[0115] In this step, the pressure angle of the gear after helix angle modification is calculated. This parameter is used to characterize the gear parameters after helix angle modification, and is also one of the gear parameters after helix angle modification that need to be obtained in the end. While finally determining the tooth thickness data that needs to be adjusted, it is also necessary to ensure that the pressure angle of the gear after helix angle modification meets the requirements of the above calculation results.

[0116] As a specific implementation, step 4 includes the following sub-steps:

[0117] Step 41, using the following formula to calculate the end face tooth thickness of the gear to be modified at the original pitch circle;

[0118]

[0119] in, Indicates the end face tooth thickness of the gear to be modified at the original pitch circle under the original parameters;

[0120] Indicates the original pitch circle;

[0121] Indicates the normal tooth thickness of the gear to be modified;

[0122] Indicates the normal tooth thickness of the gear to be modified at the original pitch circle under the original parameters;

[0123] Indicates the helix angle of the gear to be modified at the original pitch circle under the original parameters;

[0124] Step 42, use the following formula to calculate the original pitch circle of the gear after the helix angle modification The end face pressure angle at ;

[0125]

[0126] in, It indicates the end face pressure angle of the gear at the original pitch circle after the helix angle is modified;

[0127] Indicates the diameter of the modified base circle of the gear after the helix angle is modified;

[0128] Step 43, using the following formula to calculate the helix angle of the gear after the helix angle modification at the modified base circle;

[0129]

[0130] in, It indicates the helix angle of the gear after helix angle modification at the modified base circle;

[0131] Indicates the pitch circle of the gear after the helix angle is modified;

[0132] It indicates the helix angle of the gear after helix angle modification at the modified pitch circle;

[0133] It indicates the end face pressure angle of the gear after the helix angle is modified at the modified pitch circle;

[0134] Step 44, using the following formula to calculate the helix angle of the gear after the helix angle modification at the original pitch circle;

[0135]

[0136] in, It indicates the helix angle of the gear at the original pitch circle after the helix angle is modified.

[0137] As a specific implementation, step 5 includes the following sub-steps:

[0138] Step 51, according to the end face tooth thickness of the gear to be modified at the original pitch circle and the helix angle of the gear after the helix angle modification at the original pitch circle, the following formula is used to calculate the helix angle of the gear after the helix angle modification at the original pitch circle: The normal tooth thickness at

[0139]

[0140] in, It indicates the normal tooth thickness of the gear at the original pitch circle after the helix angle is modified;

[0141] Step 52, using the following formula to calculate the normal tooth thickness variation of the gear after the helix angle modification at the original pitch circle;

[0142]

[0143] in, It indicates the change of normal tooth thickness at the original pitch circle of the gear after the helix angle is modified;

[0144] Step 53, using the following formula to calculate the change in end face tooth thickness of the gear after the helix angle modification at the original pitch circle;

[0145]

[0146] in, It indicates the change in end face tooth thickness of the gear at the original pitch circle after the helix angle is modified.

[0147] As a specific implementation, in step 6, according to the helix angle of the gear at the original pitch circle after the helix angle modification, the helix angle modification slope of the gear at the original pitch circle after the helix angle modification is calculated using the following formula;

[0148]

[0149] in, It indicates the helix angle modification slope of the gear after helix angle modification at the original pitch circle.

[0150] As a specific implementation, in step 7, the end face tooth thickness of the gear after the helix angle modification at the original pitch circle is calculated using the following formula:

[0151]

[0152] in, It indicates the end face tooth thickness of the gear at the original pitch circle after the helix angle is modified.

[0153] It indicates the adjustment amount of tooth thickness change at the original pitch circle caused by helix angle modification; .

[0154] As a specific implementation, step 8 includes the following sub-steps:

[0155] Step 81, using the following formula to calculate the end face tooth thickness of the gear after the helix angle is modified at the pitch circle after the modification;

[0156]

[0157] in, It indicates the end face tooth thickness of the gear after the helix angle is modified at the pitch circle after modification;

[0158] Step 82, using the following formula to calculate the normal tooth thickness of the gear after the helix angle is modified at the pitch circle after the modification;

[0159]

[0160] in, It indicates the normal tooth thickness of the gear after helix angle modification at the modified pitch circle.

[0161] In step 9, the normal tooth thickness of the gear after the helix angle modification at the pitch circle after modification is the tooth thickness data that needs to be adjusted for the gear to be modified.

[0162] The following is a table showing a specific implementation plan and calculation example data comparison:

[0163] The original parameters of a gear part are shown in Table 1:

[0164] Table 1 Gear original parameter comparison table

[0165]

[0166] The process parameters of the gear tooth thickness adjustment process after the helix angle modification are shown in Table 2:

[0167] Table 2 Comparison table of process parameters after gear helix angle modification

[0168]

[0169] It can be seen from Table 1 and Table 2 that after calculation by the tooth thickness adjustment method of the helical angle modified gear of the present application, the final adjusted tooth thickness of the modified gear is 4.2882 mm.

[0170] The tooth thickness adjustment method for helical angle modified gears of the present invention has been applied in the production of a certain enterprise. After the helical angle of the gear is modified, the tooth thickness is adjusted according to the method of this patent. After inspection, there is no double-sided tooth surface contact phenomenon in the gear meshing. The tooth thickness adjustment method for helical angle modified gears provided by the present invention can correct the gear tooth thickness and adjust the working side clearance, avoid double tooth surface contact of the gear after modification, and ensure working reliability.

Claims

1. A method for adjusting the tooth thickness of a helical angle modified gear, characterized in that: The following steps are involved: Step 1: Collect the original parameters of the gear to be modified, including: number of teeth , modulus , pressure angle , Helix Angle , Tooth width , French tooth thickness and helix angle modification slope ; Determine two circles of the gear to be modified under original parameters: the original base circle and the original pitch circle; Step 2, calculating the helix angle modification amount of the gear to be modified according to the original parameters of the gear to be modified collected in step 1; Step 3, according to the original parameters of the gear to be modified collected in step 1 and the helix angle modification amount of the gear to be modified obtained in step 2, determining the actual parameters of the gear after the helix angle modification, including: the helix angle of the gear after the helix angle modification and the pressure angle of the gear after the helix angle modification; Step 4, according to the data obtained in step 1 and step 3, calculate the end face tooth thickness of the gear to be modified at the original pitch circle, the helix angle of the gear after helix angle modification at the modified base circle, and the helix angle of the gear after helix angle modification at the original pitch circle; Step 5, according to the data obtained in step 4, calculate the normal tooth thickness of the gear after the helix angle modification at the original pitch circle; and then calculate the normal tooth thickness change and the end tooth thickness change of the gear after the helix angle modification at the original pitch circle; Step 6, calculating the helix angle modification slope of the gear after the helix angle modification at the original pitch circle according to the data obtained in step 4; Step 7, calculating the end face tooth thickness of the gear after the helix angle modification at the original pitch circle according to the data obtained in Steps 5 and 6; Step 8, according to the data obtained in step 7, calculate the end face tooth thickness of the gear after the helix angle modification at the modified pitch circle, and then calculate the normal face tooth thickness of the gear after the helix angle modification at the modified pitch circle; Step 9, determining the tooth thickness data of the gear to be modified that needs to be adjusted according to the normal tooth thickness of the gear after the helix angle modification in step 8 at the pitch circle after modification.

2. The method for adjusting tooth thickness of a helical angle modified gear according to claim 1, characterized in that: In step 2, the helix angle modification amount of the gear to be modified is calculated using the following formula; in, Indicates the helix angle modification amount of the gear to be modified; represents the helix angle; Indicates the slope of the helix angle modification; Indicates tooth width.

3. The method for adjusting tooth thickness of a helical angle modified gear according to claim 2, characterized in that: Step 3 includes the following sub-steps: Step 31, according to the helix angle modification amount of the gear to be modified, use the following formula to determine the helix angle of the gear after the helix angle modification; in, Indicates the helix angle of the gear after helix angle modification; Step 32, using the following formula, calculate the end face pressure angle of the gear after the helix angle modification; in, Indicates the end face pressure angle of the gear after the helix angle is modified; Indicates the end face pressure angle of the gear to be modified under the original parameters; represents the pressure angle; Step 33, using the following formula, calculate the pressure angle of the gear after the helix angle modification; in, Indicates the pressure angle of the gear after the helix angle is modified.

4. The method for adjusting tooth thickness of a helical angle modified gear according to claim 3, characterized in that: Step 4 includes the following sub-steps: Step 41, using the following formula to calculate the end face tooth thickness of the gear to be modified at the original pitch circle; in, Indicates the end face tooth thickness of the gear to be modified at the original pitch circle under the original parameters; Indicates the original pitch circle; Indicates the normal tooth thickness of the gear to be modified; Indicates the normal tooth thickness of the gear to be modified at the original pitch circle under the original parameters; Indicates the helix angle of the gear to be modified at the original pitch circle under the original parameters; Step 42, using the following formula to calculate the end face pressure angle of the gear after the helix angle modification at the original pitch circle; in, It indicates the end face pressure angle of the gear at the original pitch circle after the helix angle is modified; Indicates the diameter of the modified base circle of the gear after the helix angle is modified; Step 43, using the following formula to calculate the helix angle of the gear after the helix angle modification at the modified base circle; in, It indicates the helix angle of the gear after helix angle modification at the modified base circle; Indicates the pitch circle of the gear after the helix angle is modified; It indicates the helix angle of the gear after helix angle modification at the modified pitch circle; It indicates the end face pressure angle of the gear after the helix angle is modified at the modified pitch circle; Step 44, using the following formula to calculate the helix angle of the gear after the helix angle modification at the original pitch circle; in, It indicates the helix angle of the gear at the original pitch circle after the helix angle is modified.

5. The method for adjusting tooth thickness of a helical angle modified gear according to claim 4, characterized in that: Step 5 includes the following sub-steps: Step 51, according to the end face tooth thickness of the gear to be modified at the original pitch circle and the helix angle of the gear after the helix angle modification at the original pitch circle, the following formula is used to calculate the helix angle of the gear after the helix angle modification at the original pitch circle: The normal tooth thickness at in, It indicates the normal tooth thickness of the gear at the original pitch circle after the helix angle is modified; Step 52, using the following formula to calculate the normal tooth thickness variation of the gear after the helix angle modification at the original pitch circle; in, It indicates the change of normal tooth thickness at the original pitch circle of the gear after the helix angle is modified; Step 53, using the following formula to calculate the change in end face tooth thickness of the gear after the helix angle modification at the original pitch circle; in, It indicates the change in end face tooth thickness of the gear at the original pitch circle after the helix angle is modified.

6. The method for adjusting tooth thickness of a helical angle modified gear according to claim 5, characterized in that: In step 6, according to the helix angle of the gear at the original pitch circle after the helix angle modification, the helix angle modification slope of the gear at the original pitch circle after the helix angle modification is calculated using the following formula; in, It indicates the helix angle modification slope of the gear after helix angle modification at the original pitch circle.

7. The method for adjusting tooth thickness of a helical angle modified gear according to claim 6, characterized in that: In step 7, the end face tooth thickness of the gear after helix angle modification at the original pitch circle is calculated using the following formula; in, It indicates the end face tooth thickness of the gear at the original pitch circle after the helix angle is modified; Indicates the original pitch circle after the helix angle is modified The tooth thickness change adjustment at .

8. The method for adjusting tooth thickness of a helical angle modified gear according to claim 7, characterized in that: Step 8 includes the following sub-steps: Step 81, using the following formula to calculate the end face tooth thickness of the gear after the helix angle is modified at the pitch circle after the modification; in, It indicates the end face tooth thickness of the gear after the helix angle is modified at the pitch circle after modification; Step 82, using the following formula to calculate the normal tooth thickness of the gear after the helix angle is modified at the pitch circle after the modification; in, It indicates the normal tooth thickness of the gear after helix angle modification at the modified pitch circle.

9. The method for adjusting tooth thickness of a helical angle modified gear according to claim 8, characterized in that: In step 9, the normal tooth thickness of the gear after the helix angle modification at the pitch circle after modification is the tooth thickness data that needs to be adjusted for the gear to be modified.

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