Method for modifying and measuring helix angles on both sides of a tooth profile

Abstract

The application provides a tooth profile two-side helix angle unequal amount modification and measurement method, belongs to the technical field of gear modification, and can realize tooth profile two-side helix angle unequal amount modification, can judge whether the thickness of the modified gear is qualified, and can detect the modification result of the gear tooth profile. The application expands the types of gear machining, and improves the gear manufacturing technology level and ability.

Description

Technical Field

[0001] This invention belongs to the technical field of gear modification, and specifically discloses a method for modifying and measuring the unequal helix angles on both sides of a gear tooth. Background Technology

[0002] The gearbox plays a crucial role in the vehicle's drivetrain, enabling speed and torque changes, reverse gearing, and interrupting power transmission. These functions are primarily achieved through the meshing of gears. In gear transmission, as speed or load increases, the deformation of the gear teeth also increases, leading to greater deformation of the support system. Furthermore, factors such as manufacturing and installation errors, gear elastic deformation, and thermal deformation inevitably cause impacts, vibrations, and uneven loads during meshing. This reduces transmission accuracy, shortens service life, and increases gear transmission noise.

[0003] By modifying the tooth profile and tooth direction of gears, meshing performance can be effectively improved, load-bearing capacity increased, service life extended, and gear noise reduced. The correction of pitch and tooth profile errors resulting from the combined effects of gear manufacturing, elastic deformation of teeth under load, and thermal deformation during high-speed operation is called tooth profile modification, while the correction of helix errors is called tooth direction modification. There are two types of tooth direction modification: the first is only tooth direction crowning modification without helix angle modification; the second is both tooth direction crowning modification and helix angle modification.

[0004] Unequal helix angles on both sides of the gear tooth direction can improve gear accuracy, thereby improving the uneven distribution of load on the contact line, increasing load-bearing capacity, and extending gear service life. However, the measurement of related parameters is quite complex.

[0005] Gear tooth thickness is a crucial parameter in gear design and manufacturing. Excessive or insufficient tooth thickness can lead to problems such as gear jamming and noise during operation. Since tooth thickness cannot be directly measured, it is typically measured indirectly using the span of the bar or the ball spacing (i.e., the M-value). This leads to the question of how to calculate the M-value more accurately in the design phase to guide tooth thickness tolerance control during actual manufacturing. However, no information has been found regarding the calculation and measurement of the M-value for unequal helix angles on both sides of the gear tooth profile.

[0006] The P40 / P26 tooth profile detector currently used by the applicant cannot distinguish between tooth profile modification and tooth profile error. Therefore, it is necessary to select a new tooth profile detector and upgrade its functions. Summary of the Invention

[0007] This invention provides a method for modifying gear teeth with unequal helix angles on both sides of the tooth direction, which can realize the modification of gear teeth with unequal helix angles on both sides of the tooth direction. It also provides a method for measuring the unequal helix angles on both sides of the tooth direction, which can determine whether the thickness of the gear obtained after modification by the machine tool is qualified and detect the gear tooth direction modification result.

[0008] The above-mentioned method for modifying the tooth profile by unequal helix angles on both sides involves correcting the helix angles on both sides of the tooth profile from equal to unequal during the gear grinding process. The tooth profile modification direction is determined based on the workpiece's clamping position on the gear grinding machine and the tooth profile modification direction marked on the design drawings. When the input value of the helix angle is positive, a tooth profile that is wider at the top and narrower at the bottom is modified on the tooth width. When the input value of the helix angle is negative, a tooth profile that is narrower at the top and wider at the bottom is modified on the tooth width. The deviation value of the helix slope of the tooth surface is directly calculated according to the proportion shown in the metrology report. The deviation of the helix slope is adjusted by modifying the helix angle in the tooth profile modification parameter table to meet the design requirements of the tooth profile modification.

[0009] The above-mentioned method for modifying and measuring the unequal helix angles on both sides of the gear tooth direction includes the following steps: S1, calculate the span-bar distance or span-ball distance at any height h along the gear axis after modification according to the design drawings, and record it as the design value of the span-bar distance or span-ball distance.

[0010] The design drawings provide data including the helix angle β1 before modification, the modification amounts on both sides of the tooth direction α1 and α2 respectively, α1 > α2, the tooth width H, and the maximum value Sn of the pitch circle tooth thickness after modification. max and minimum value Sn min The maximum value Mn of the span distance or span ball distance corresponding to the pitch circle tooth thickness. max and minimum value Mn min Step S1 includes the following steps:

[0011] t1, verify Sn max and Sn min With Mn max and Mn min Is there a one-to-one correspondence?

[0012] Through Mn max and Mn min The pitch circle tooth thickness obtained by reverse calculation is denoted as Sn. max ' and Sn min ', Determine Sn max 'and Sn max Consistent, Sn min ' and Sn min If consistent, proceed to step t2;

[0013] t2, based on the modification amounts α1 and α2 on both sides of the gear tooth direction, calculate the pitch circle tooth thickness of the gear before modification and the tooth thickness changes Δ1 and Δ2 on both sides of the gear tooth direction at any height h along the gear axis. Then, compensate for the pitch circle tooth thickness of the modified gear using Δ1 and Δ2 to obtain the pitch circle tooth thickness S at any height h along the gear axis. h Through S h Calculate the span distance or ball distance at any height h to obtain the design value of the span distance or ball distance;

[0014] S2, measure the span of the bar or the span of the ball along the gear axis at a preset height after the gear has been modified by the machine tool, and record it as the measured value of the span of the bar or the span of the ball. Substitute the value of the preset height into h in step S1 to calculate the design value of the span of the bar or the span of the ball at the preset height. Compare the design value and the measured value. If the measured value is within the range of the design value, the thickness of the gear after the machine tool modification is deemed to be qualified. If the measured value is outside the range of the design value, the thickness of the gear after the machine tool modification is deemed to be unqualified.

[0015] S3 is inspected using a WGT400 LIEBHERR tooth profile inspection instrument. The inspection direction is consistent with the modification direction to distinguish between tooth profile modification and tooth profile error, and to verify whether the modification direction is correct.

[0016] Unequal helix angle modification on both sides of the gear tooth direction includes unidirectional modification and reverse modification on both sides of the gear tooth direction, with the pitch circle tooth thickness S corresponding to any height h along the gear axis. h Including the maximum value S hmax and S hmin S hmax and S hmin The conversion is performed between them using tolerances. In step t2:

[0017] When the gear teeth are modified in the same direction on both sides, S hmax =Sn max -(1-h / H)(α1+α2)

[0018] When the gear teeth are modified in opposite directions, S hmax =Sn max -(α1-α2)h / H.

[0019] In step S2, a measuring table, measuring beads, and a micrometer are used for measurement;

[0020] The measuring table is equipped with a measuring bead support platform that mates with the tooth grooves of the gear to be measured;

[0021] First, fix the measuring beads on the measuring bead support platform to form a measuring assembly. Then, insert the measuring bead support platforms of the two measuring assemblies into the tooth groove of the gear to be measured. Finally, use a micrometer to measure the distance between the two measuring beads, which is the measured value of the bar spacing or ball spacing.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This invention provides a method for modifying the tooth profile with unequal helix angles on both sides. If tooth profile modification is performed during the hobbing process, the allowance left for the grinding process after the hobbing process will be inconsistent due to the unequal modification on both sides of the tooth profile, which may affect the heat treatment diffusion layer. Therefore, this invention performs tooth profile modification during the grinding process.

[0024] 2. It provides calculation and measurement of the distance between the bar and the ball after the gear tooth is modified with unequal helix angles on both sides, filling a technical gap;

[0025] 3. The WGT400 LIEBHERR tooth profile inspection instrument is used for inspection, which can distinguish between tooth profile modification and tooth profile error;

[0026] In summary, this invention expands the types of gear processing and improves the level and capability of gear manufacturing technology. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 The cross-sectional view of the gear tooth before and after the unequal modification of the tooth direction on both sides in the same direction;

[0029] Figure 2 The cross-sectional view of the gear tooth before and after the unequal modification of the tooth direction on both sides in opposite directions;

[0030] Figure 3 A three-dimensional view of the measuring platform;

[0031] Figure 4 This is a front view of the measuring table;

[0032] Figure 5 for Figure 4 The left view;

[0033] Figure 6 for Figure 4 Top view;

[0034] Figure 7 A diagram showing the combination of the measuring platform and the measuring beads;

[0035] Figure 8 This is a tooth direction inspection report after unequal modification of the tooth direction on both sides in the same direction.

[0036] Figure 9 The image shows the inspection results of a part after unequal modification of the tooth direction on both sides of the gear tooth on the P26 tooth profile inspection instrument.

[0037] Figure 10 The image shows the inspection results of a part with unequal tooth profiles on both sides of the gear tooth direction using a WGT400LIEBHERR tooth profile inspection instrument.

[0038] In the diagram: measuring platform 1; measuring bead support platform 1.1; measuring bead 2. Detailed Implementation

[0039] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0040] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0041] Example 1

[0042] This embodiment provides a method for modifying the helix angles on both sides of a gear tooth profile to be unequal. During the gear grinding process, the helix angles on both sides of the gear tooth profile are modified from being equal to being unequal (the shape of the tooth width changes from a parallelogram to a shape that is wider at the top and narrower at the bottom, or vice versa). The tooth profile modification direction is determined according to the clamping position of the workpiece on the gear grinding machine and the tooth profile modification direction marked in the design drawings. When the input value of the helix angle is positive, a tooth profile that is wider at the top and narrower at the bottom is modified on the tooth width. When the input value of the helix angle is negative, a tooth profile that is narrower at the top and wider at the bottom is modified on the tooth width. The deviation value of the helix slope of the tooth surface is directly calculated according to the proportion shown in the measurement report. The deviation of the helix slope is adjusted by modifying the helix angle in the tooth profile modification parameter table to meet the design requirements of the tooth profile modification.

[0043] Example 2

[0044] This embodiment provides a method for modifying and measuring the unequal helix angles on both sides of a gear tooth, including the following steps.

[0045] S1, calculate the span of the bar or the span of the ball at any height h along the gear axis after modification according to the design drawings, and record it as the design value of the span of the bar or the span of the ball.

[0046] The design drawings provide data including the helix angle β1 before modification, the modification amounts on both sides of the tooth direction α1 and α2 respectively, α1 > α2, the tooth width H, and the maximum value Sn of the pitch circle tooth thickness after modification. max and minimum value Sn min The maximum value Mn of the span distance or span ball distance corresponding to the pitch circle tooth thickness. max and minimum value Mn min Step S1 includes the following steps.

[0047] t1, verify Sn max and Sn min With Mn max and Mn min Is there a one-to-one correspondence?

[0048] Through Mn max and Mn min The pitch circle tooth thickness obtained by reverse calculation is denoted as Sn. max ' and Sn min ', Determine Sn max 'and Sn max Consistent, Sn min ' and Sn min If consistent, proceed to step t2.

[0049] t2, based on the modification amounts α1 and α2 on both sides of the gear tooth direction, calculate the pitch circle tooth thickness of the gear before modification and the tooth thickness changes Δ1 and Δ2 on both sides of the gear tooth direction at any height h along the gear axis. Then, compensate for the pitch circle tooth thickness of the modified gear using Δ1 and Δ2 to obtain the pitch circle tooth thickness S at any height h along the gear axis. h Through S h Calculate the span distance or ball distance at any height h to obtain the design value of the span distance or ball distance;

[0050] Unequal helix angle modification on both sides of the gear tooth direction includes unidirectional modification and reverse modification on both sides of the gear tooth direction, with the pitch circle tooth thickness S corresponding to any height h along the gear axis. h Including the maximum value S hmax and S hmin S hmax and S hmin The conversion between them is done through tolerances, usually by calculating S. hmax The calculation process is as follows.

[0051] (1) The tooth profile is modified in the same direction on both sides of the gear tooth direction.

[0052] Using trigonometric functions, the profile adjustments α1 and α2 on both sides of the gear tooth direction are converted into profile adjustments β2 and β3.

[0053] β2=arctan(tanβ1-α1 / H)

[0054] β3 = arctan(tanβ1 + α2 / H)

[0055] Calculate the maximum pitch circle tooth thickness Sn of the gear before modification. max ''

[0056] Sn max '' = Sn max -α1-α2

[0057] Calculate the tooth thickness variations Δ1 and Δ2 on both sides of the tooth direction at any height h.

[0058] △1=h(tanβ1-tanβ2)=h[tanβ1-(tanβ1-α1 / H)]=hα1 / H

[0059] △2=h(tanβ3-tanβ1)=h[(tanβ1+α2 / H)-tanβ1]=hα2 / H

[0060] Calculate S at any height h hmax

[0061] S hmax =Sn max '' + △1 + △2 = Sn max -α1-α2+hα1 / H+hα2 / H=Sn max -(1-h / H)

[0062] (α1+α2)

[0063] According to S hmax and S hmin Tolerance calculation S between hmin Through S hmax and S hmin Calculate M at any height h hmax and M hmin This yields the design values ​​for the span distance or the ball distance.

[0064] (2) Reverse profile modification of gear teeth on both sides

[0065] Using trigonometric functions, the profile adjustments α1 and α2 on both sides of the gear tooth direction are converted into profile adjustments β2 and β3.

[0066] β2=arctan(tanβ1-α1 / H)

[0067] β3 = arctan(tanβ1 - α2 / H)

[0068] Calculate the maximum pitch circle tooth thickness Sn of the gear before modification. max ''

[0069] Sn max '' = Sn max +α2

[0070] Calculate the tooth thickness variations Δ1 and Δ2 on both sides of the tooth direction at any height h.

[0071] △1=h(tanβ1-tanβ2)=h[tanβ1-(tanβ1-α1 / H)]=hα1 / H

[0072] △2=(Hh)(tanβ1-tanβ3)=(Hh)[tanβ1-(tanβ1-α2 / H)]=(Hh)α2 / H

[0073] Calculate S at any height h hmax

[0074] S hmax =Sn max ''-△1-△2=Sn max +α2-hα1 / H-(Hh)α2 / H=Sn max -(α1-α2)h / H

[0075] According to S hmax and S hmin Tolerance calculation S between hmin Through S hmax and S hmin Calculate M at any height h hmax and M hmin This yields the design values ​​for the span distance or the ball distance.

[0076] S2, measure the span of the bar or the span of the ball along the gear axis at a preset height after the gear has been modified by the machine tool, and record it as the measured value of the span of the bar or the span of the ball. Substitute the value of the preset height into h in step S1 to calculate the design value of the span of the bar or the span of the ball at the preset height. Compare the design value and the measured value. If the measured value is within the range of the design value, the thickness of the gear after the machine tool modification is deemed to be qualified. If the measured value is outside the range of the design value, the thickness of the gear after the machine tool modification is deemed to be unqualified.

[0077] In step S2, a measuring platform 1, measuring beads 2, and a micrometer are used for measurement. The measuring platform 1 is equipped with a measuring bead support 1.1 that mates with the tooth groove of the gear to be measured. First, the measuring beads 2 are fixed on the measuring bead support 1.1 to form a measuring assembly. Then, the measuring bead support 1.1 of the two sets of measuring assemblies are inserted into the tooth groove of the gear to be measured. Finally, the distance between the two measuring beads 2 is measured with a micrometer, which is the measured value of the bar spacing or ball spacing.

[0078] S3 is inspected using a WGT400 LIEBHERR tooth profile inspection instrument. The inspection direction is consistent with the modification direction to distinguish between tooth profile modification and tooth profile error, and to verify whether the modification direction is correct.

[0079] Example 3

[0080] like Figure 1 As shown, this diagram illustrates the tooth profile modification on both sides in the same direction. The thick solid line represents the tooth profile shape after modification (narrower at the top and wider at the bottom), while the thin solid line represents the tooth profile shape without helix angle modification (a parallelogram with consistent width at both ends). The known parameters from the design drawings are: helix angle β1 = 16° before modification; modification amounts on both sides of the tooth profile are α1 and α2, α1 = 0.065 mm and α2 = 0.015 mm, respectively; tooth width H = 35.1 mm; and the maximum value Sn of the pitch circle tooth thickness after modification. max = 6.495mm, measuring bead specifications

[0081] Find the tooth thickness S corresponding to a height h = 17.67 mm. h And will be converted into the corresponding cross-ball distance.

[0082] First, trigonometric functions are used to convert the tooth profile adjustments on both sides into profile angles.

[0083] β2=arctan(tanβ1-α1 / H)=0.2776°

[0084] β3=arctan(tanβ1+α2 / H)=0.2796°

[0085] Calculate the maximum pitch circle tooth thickness Sn of the gear before modification. max '' = Sn max -α1-α2=6.415mm

[0086] Calculate the tooth thickness changes Δ1 and Δ2 on both sides of the tooth direction corresponding to a height h = 17.67 mm.

[0087] △1=h(tanβ1-tanβ2)=hα1 / H=0.0327mm

[0088] △2=h(tanβ3-tanβ1)=hα2 / H=0.0076mm

[0089] Calculate the maximum tooth thickness S corresponding to a height h = 17.67 mm. hmax =Sn max '' + △1 + △2 = 6.4553 mm

[0090] According to S hmax and S hmin Tolerance calculation S between hminThrough S hmax and S hmin Calculate the height h = 17.67 mm, and the corresponding M value.

[0091] Example 4

[0092] like Figure 2 As shown, this diagram illustrates reverse profile modification of the gear tooth on both sides. The thick solid line represents the tooth profile shape after modification (wider at the top and narrower at the bottom), while the thin solid line represents the tooth profile shape without helix angle correction (a parallelogram with consistent width at both ends). Known parameters from the design drawings are: helix angle β1 = 16° before modification; modification amounts on both sides of the tooth profile are α1 and α2, α1 = 0.055 mm and α2 = 0.02 mm, respectively; tooth width H = 35.1 mm; and the maximum value of the pitch circle tooth thickness Sn after modification. max = 6.333mm, measuring bead specifications

[0093] Find the tooth thickness S corresponding to a height h = 20.05 mm. h And will be converted into the corresponding cross-ball distance.

[0094] Using trigonometric functions, the profile adjustments α1 and α2 on both sides of the gear tooth direction are converted into profile adjustments β2 and β3.

[0095] β2=arctan(tanβ1-α1 / H)=0.2778°

[0096] β3=arctan(tanβ1-α2 / H)=0.2787°

[0097] Calculate the maximum pitch circle tooth thickness Sn of the gear before modification. max '' = Sn max +α2=6.353mm

[0098] Calculate the tooth thickness changes Δ1 and Δ2 on both sides of the tooth direction corresponding to a height h = 20.05 mm.

[0099] △1=h(tanβ1-tanβ2)=hα1 / H=0.0314mm

[0100] △2=(Hh)(tanβ1-tanβ3)=(Hh)α2 / H=0.0086mm

[0101] Calculate the maximum tooth thickness S at a height h = 20.05 mm. hmax =Sn max ''-△1-△2=6.3130mm

[0102] According to S hmax and S hminTolerance calculation S between hmin Through S hmax and S hmin Calculate the M value corresponding to heights h = 17.67 mm and h = 20.05 mm.

[0103] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for modifying and measuring the unequal helix angles on both sides of a gear tooth, characterized in that, Includes the following steps: S1, calculate the span of the bar or the span of the ball at any height h along the gear axis after modification according to the design drawings, and record it as the design value of the span of the bar or the span of the ball. The design drawings provide data including the helix angle β1 before modification, the modification amounts on both sides of the tooth direction α1 and α2 respectively, α1 > α2, the tooth width H, and the maximum value Sn of the pitch circle tooth thickness after modification. max and minimum value Sn min The maximum value Mn of the span distance or span ball distance corresponding to the pitch circle tooth thickness. max and minimum value Mn min Step S1 Includes the following steps: t1, verify Sn max and Sn min With Mn max and Mn min Is there a one-to-one correspondence? Through Mn max and Mn min The pitch circle tooth thickness obtained by reverse calculation is denoted as Sn. max ' and Sn min ', Determine Sn max 'and Sn max Consistent, Sn min ' and Sn min If consistent, proceed to step t2; t2, based on the modification amounts α1 and α2 on both sides of the gear tooth direction, calculate the pitch circle tooth thickness of the gear before modification and the tooth thickness changes △1 and △2 on both sides of the gear tooth direction at any height h along the gear axis. Then, compensate for the pitch circle tooth thickness of the modified gear using △1 and △2 to obtain the pitch circle tooth thickness S at any height h along the gear axis. h Through S h Calculate the span distance or ball distance at any height h to obtain the design value of the span distance or ball distance; Unequal helix angle modification on both sides of the gear tooth direction includes unidirectional modification and reverse modification on both sides of the gear tooth direction, with the pitch circle tooth thickness S corresponding to any height h along the gear axis. h Including the maximum value S hmax and minimum value S hmin S hmax and S hmin The conversion is performed between them using tolerances, S hmax The calculation process is as follows; (1) The tooth profile is modified in the same direction on both sides. Using trigonometric functions, the profile adjustments α1 and α2 on both sides of the gear tooth direction are converted into profile adjustments β2 and β3. β2 = arctan(tanβ1 - α1 / H) β3 = arctan(tanβ1 + α2 / H) Calculate the maximum pitch circle tooth thickness Sn of the gear before modification. max '' Sn max ''=Sn max -α1-α2 Calculate the tooth thickness variations Δ1 and Δ2 on both sides of the tooth direction at any height h. △1=h(tanβ1-tanβ2)= h〔tanβ1-(tanβ1-α1 / H)〕= hα1 / H △2=h(tanβ3-tanβ1)= h〔(tanβ1+α2 / H)-tanβ1〕=hα2 / H Calculate S at any height h hmax S hmax = Sn max ''+ △1+ △2= Sn max -α1-α2+ hα1 / H + hα2 / H= Sn max -(1- h / H)(α1+α2) According to S hmax and S hmin Tolerance calculation S between hmin Through S hmax and S hmin Calculate M at any height h hmax and M hmin This yields the design values ​​for the span between bars or the span between balls. (2) The tooth profile is modified in opposite directions on both sides. Using trigonometric functions, the profile adjustments α1 and α2 on both sides of the gear tooth direction are converted into profile adjustments β2 and β3. β2 = arctan(tanβ1 - α1 / H) β3 = arctan(tanβ1 - α2 / H) Calculate the maximum pitch circle tooth thickness Sn of the gear before modification. max '' Sn max ''=Sn max +α2 Calculate the tooth thickness variations Δ1 and Δ2 on both sides of the tooth at any height h. △1=h(tanβ1-tanβ2)= h〔tanβ1-(tanβ1-α1 / H)〕= hα1 / H △2=(Hh)(tanβ1-tanβ3)=(Hh)[tanβ1-(tanβ1-α2 / H)]=(Hh)α2 / H Calculate S at any height h hmax S hmax = Sn max ''- △1-△2= Sn max +α2- hα1 / H -(H-h)α2 / H= Sn max -(α1-α2)h / H According to S hmax and S hmin Tolerance calculation S between hmin Through S hmax and S hmin Calculate M at any height h hmax and M hmin This yields the design values ​​for the span between bars or the span between balls. S2, measure the span of the bar or the span of the ball along the gear axis at a preset height after the gear has been modified by the machine tool, and record it as the measured value of the span of the bar or the span of the ball. Substitute the value of the preset height into h in step S1 to calculate the design value of the span of the bar or the span of the ball at the preset height. Compare the design value and the measured value. If the measured value is within the range of the design value, the thickness of the gear after the machine tool modification is deemed to be qualified. If the measured value is outside the range of the design value, the thickness of the gear after the machine tool modification is deemed to be unqualified.

2. The method for modifying and measuring the unequal helix angles on both sides of the gear tooth direction according to claim 1, characterized in that, In step S2, a measuring table, measuring beads, and a micrometer are used for measurement; The measuring table is equipped with a measuring bead support platform that mates with the tooth grooves of the gear to be measured; First, fix the measuring beads on the measuring bead support platform to form a measuring assembly. Then, insert the measuring bead support platforms of the two measuring assemblies into the tooth groove of the gear to be measured. Finally, use a micrometer to measure the distance between the two measuring beads, which is the measured value of the bar spacing or ball spacing.

3. The method for modifying and measuring the unequal helix angles on both sides of the gear tooth direction according to claim 1 or 2, characterized in that, The procedure also includes step S3, which involves using a WGT400 LIEBHERR tooth profile detector for inspection. The inspection direction is consistent with the modification direction to distinguish between tooth profile modification and tooth profile error, and to verify whether the modification direction is correct.

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