GB/T 10089-2018Accuracy of cylindrical worm and wormwheel (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 10089-1988 "Cylinder worm, worm gear accuracy". Compared with GB/T 10089-1988, the main changes of this standard are as follows:

--- Added standard preface;

--- Revised the scope of application of the standard (see Chapter 1, Chapter 1 of the 1988 edition);

--- Removed references to GB/T 1800, GB/T 10086 and GB/T 10087, added reference to GB/T 3374.2 (see section Chapter 2, Chapter 2 of the 1988 edition);

---Modified the term definition and code of the worm and worm gear tooth size parameter deviation, which removes the worm-rotation spiral deviation, worm Accumulated deviation of axial pitch, accumulated deviation of k pitch of worm wheel, radial deviation of worm wheel, deviation of tooth thickness, center distance of worm pair Deviation, intermediate plane offset of the worm pair, deviation of the shaft angle of the worm pair, and the definition and code of the lash of the worm pair Definitions and codes for terms of adjacent pitch deviations (see Chapter 3, Chapter 3 of the 1988 edition);

--- Added the chapter "Symbols" (see Chapter 4);

--- Revised the requirements for the composition of the precision system, etc., which removed the provisions on the tolerance group (see Chapter 5, 1988 edition) Chapter 4);

--- Removed the requirements for the tooth blank (Chapter 5 of the 1988 edition);

--- Modified the formula for calculating the allowable value of the deviation (see Chapter 6, Appendix A of the 1988 edition);

--- Added the chapter "Inspection Rules" (see Chapter 7);

--- Modified the parameter segmentation and value in the deviation allowable value table (see Chapter 8, Chapter 6 of the 1988 edition);

--- Removed the center distance deviation of the worm pair, the intermediate plane offset of the worm pair, the deviation of the shaft angle of the worm pair, and the backlash of the worm pair Requirements (see Chapters 7 and 8 of the 1988 edition);

--- Removed the requirements for other instructions and graphic annotations (see Chapters 9, 10 of the 1988 edition). Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying these patents. This standard is proposed and managed by the National Gear Standardization Technical Committee (SAC/TC52). This standard was drafted. Chongqing Machine Tool (Group) Co., Ltd., Zhengzhou Machinery Research Institute Co., Ltd., Beijing University of Technology. The main drafters of this standard. Li Xianguang, Li Yi, Yu Kebin, Zhang Yuanguo, Shi Zhaoyao, Zhang Liang, Long Lin, Li Mingyu, Xie Xiaoqing, Li Wu, Huang Guangrong, Wang Zhigang, and the army. The previous versions of the standards replaced by this standard are.

---GB/T 10089-1988. Cylindrical worm and worm gear accuracy

1 Scope

GB/T 10089-2018 is the Chinese national standard on accuracy of cylindrical worm and wormwheel, in the field of mechanical systems and components. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 14 May 2018 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 December 2018. Classification: ICS 21.200, CCS J17. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This standard specifies the accuracy of the cylindrical worm gear drive mechanism. This standard is applicable to cylindrical worms with shaft angle of intersection S=90°, maximum modulus m=40 mm and maximum division circle diameter d=2500 mm. Worm gear drive mechanism. The cylindrical worm and worm gear transmission mechanism with the largest indexing circle diameter d >2500mm can be used with reference to this standard.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 3374.2 Terms and definitions of gears - Part 2. Definition of worm gear geometry

3 Terms and definitions

The following terms and definitions as defined in GB/T 3374.2 apply to this document.

4 Contact spots of the worm pair

The following symbols apply to this document.

4.1 Parameters of worm and worm gear (length unit. mm) a center distance b' Working length of the worm pair contact surface b'' length of the worm pair contact mark D1 worm indexing circle diameter D2 worm wheel indexing circle diameter h' Working height of the worm pair contact surface h'' average height of worm pair contact marks l Worm measuring length Mx worm axial modulus Mt worm gear end modulus Z1 number of worm heads Z2 worm gear number Lalpha tooth profile range phi precision level between levels S-axis angle

4.2 Deviation of worm and worm gear (unit. micron) f single deviation Ffalpha tooth profile deviation Ffalpha1 worm tooth profile deviation Ffalpha2 worm gear profile deviation fHalpha tooth profile tilt deviation fHalpha1 worm tooth profile tilt deviation fHalpha2 worm gear tooth profile tilt deviation F'i single-sided one-tooth meshing deviation F'i1 single-sided one-tooth meshing deviation measured with a standard worm gear F'i2 single-sided one-tooth meshing deviation measured with a standard worm F'i

12 One-to-one tooth offset deviation measured with a paired worm pair Fp single pitch deviation Fpx worm axial pitch deviation Fp2 worm gear single pitch deviation Fu adjacent tooth pitch deviation Fux worm adjacent axial pitch deviation Fu2 worm gear adjacent tooth pitch deviation F total deviation F'i single-sided meshing deviation F'i1 single-sided meshing deviation measured with a standard worm gear F'i2 single-sided meshing deviation measured with a standard worm F'i12 single-sided meshing deviation measured with paired worm pair Fpz worm lead deviation Fp2 worm gear pitch cumulative total deviation Fr radial runout deviation Fr1 worm radial runout deviation Fr2 worm gear radial runout deviation Falpha tooth profile total deviation Falpha1 worm tooth profile total deviation Falpha2 worm gear total deviation

5 Precision system

5.1 General In order to meet all the performance requirements of the worm and worm gear transmission, such as the smoothness of the transmission, the uniformity of the load distribution, and the accuracy of the transmission movement Sex and long service life, the deviation of the tooth size parameters of the worm and the worm gear and the deviation of the center distance and the deviation of the shaft angle should be guaranteed. Within the range of values.

Note. The allowable values of the center distance deviation and the shaft angle deviation are not specified in this standard.

5.2 Deviation of gear tooth size parameters The single deviation f refers to the deviation of the single-item size parameter of the worm-gear transmission mechanism gear, such as the pitch deviation. Total deviation F includes more The combined effect of individual deviations. The definition of the tooth size parameter deviation of the worm gear mechanism is given in Chapter 3.

5.3 Accuracy level This standard specifies 12 accuracy grades for the worm and worm gear transmission; the first stage has the highest accuracy and the 12th level has the lowest accuracy. Depending on the requirements of use, it is permissible to use a combination of deviations of different accuracy levels. The accuracy levels of the worm and the paired worm gear are generally taken to be the same, and are also allowed to be made different. Steel worms with high hardness and soft material Among the transmission mechanisms composed of the worm wheel, a worm having a higher accuracy level than the worm wheel can be selected, and the accuracy of the worm wheel can be improved during the running-in period. Such as a worm You can choose 8 levels of precision, and the worm wheel selects 9 levels of accuracy.

5.4 Allowable value of deviation The measured deviation is compared with the values specified in Tables 1 to 12 to evaluate the accuracy level of the worm gear. The values in the table are It is calculated by multiplying the formula specified in the sixth grade in Chapter 6 by the inter-stage common ratio phi. The inter-stage common ratio phi of two adjacent precision levels is. phi = 1.4 (1~9 accuracy); phi = 1.6 (9 precision below); radial runout deviation The common ratio of Fr is phi=1.4 (1~12 precision). For example, when calculating the deviation allowable value of the 7-level precision, the uncorrected calculated value of the 5-level precision is multiplied by 1.42, and then specified in 5.5. Rules to repair.

5.5 Revision rules The values listed in Tables 1 to 12 are the values calculated and corrected by the formula in Chapter 6. If the calculated value is less than 10µm, repair to The closest fraction or integer with a phase difference of less than 0.5 µm, if greater than 10 µm, is rounded to the nearest integer. 6 5-level precision worm and worm gear deviation allowable value calculation formula

7 Inspection rules

7.1 Radial runout deviation Worm gear. The intermediate position of the tooth width of the worm wheel indexing circle should be measured. Worm. Generally, the radial runout deviation value is obtained by indirectly measuring the pitch variation.

7.2 Single pitch deviation and adjacent pitch deviation Worm gear. The intermediate position of the tooth width of the worm wheel indexing circle should be measured. Worm. The axial pitch deviation is measured on the indexing cylindrical surface. The multi-head worm also measures other axial sections until the deviation of all the teeth of the worm is obtained.

7.3 Total deviation of pitch accumulation Worm gear. The intermediate position of the tooth width of the worm wheel indexing circle should be measured.

7.4 Single-face meshing deviation and single-sided one-tooth meshing deviation The single-sided meshing test reflects the comprehensive influence of the deviation of the individual parameters of the gear teeth during the meshing process of the worm and the worm gear on the meshing process. Worm and worm The wheel meshes within a given center distance, and the right or left flank of the worm is always in mesh with the worm gear mating surface, if not fixed For the working tooth surface, the right flank and the left flank must be detected. The one-sided meshing deviation F'i and the one-sided one-tooth meshing deviation f'i are checked using a standard worm gear wheel pair. Generally there is no standard worm Wheel sets, in the enterprise generally use a single-sided meshing detector to check the paired worm gear pair. If there is no single-sided meshing test in the enterprise The single-sided meshing detector can also check the contact spots of the paired worm gear pair. See Appendix A for the requirements.

7.5 Total tooth profile deviation The total deviation of the tooth profile should be measured in the range of the root circle and the tip circle. Measuring the total deviation of the tooth profile in the axial section of the worm, flattening in the middle of the worm wheel The total deviation of the tooth profile was measured in-plane.

7.6 lead deviation The lead deviation is measured within the measured length l within the meshing range of the worm. For the measurement length, refer to Tables 1 to 12. Worm The actual meshing length of the rod is less than the specified measuring length l, and the worm lead deviation Fpz is measured directly according to the actual meshing length.

8 Allowable values of tooth size parameter deviation

Worm worm gear tooth size parameter deviation The allowable values of each precision grade are shown in Table 1~ Table 12. The values in the table and the worm axial modulus mx, The worm wheel end face modulus mt, the index circle diameter d, and the number of worm heads z1 are related. When measuring the deviation of the worm, the diameter of the worm index circle d1 is used. The worm wheel index circle diameter d2 is used when the worm wheel is deviated. For the deviation allowable value of the single-sided meshing deviation F'i of the worm pair and the one-tooth-tooth-tooth meshing deviation f'i, the calculation formula is. F'i= (F'i1)2 (F'i2)2 F'i= (f'i1)2 (f'i2)