标准编号:	GB/T 3478.8-2008
中文名称:	圆柱直齿渐开线花键 （米制模数 齿侧配合）　第8部分：45°压力角 M值和W值
英文名称:	Straight cylindrical involute splines - Metric module side fit - Part 8: 45°pressure angle M and W values
中标分类:	J18    链传动、皮带传动与键联结
行业分类:	GB    国家标准
ICS分类:	21.120.30 21.120.30    键和键槽、花键 21.120.30
发布机构:	中华人民共和国国家质量监督检验检疫总局 中国家标准化管理委员会
发布日期:	2008-9-22
实施日期:	2009-5-1
标准状态:	valid
替代旧标准:	GB/T 3478.8-1995 园柱直齿渐开线花键 45°压力角 M值和W值
翻译语言:	英文
文件格式:	PDF
翻译字数:	75000 字
交付时间:	1 个工作日

GB/T 3478 consists of the following nine parts under the general title Straight cylindrical involute splines - Metric module, side fit: ——Part 1: Generalities; ——Part 2: 30° pressure angle dimensions tables; ——Part 3: 37.5° pressure angle dimensions tables; ——Part 4: 45° pressure angle dimensions tables; ——Part 5: Inspection; ——Part 6: 30° pressure angle M and W values; ——Part 7: 37.5° pressure angle M and W values; ——Part 8: 45° pressure angle M and W values; ——Part 9: Measuring pin. This part is Part 8 of GB/T 3478. 1 Scope This part of GB/T 3478 specifies the calculation formulae and limiting dimensions tables for M value (measurement between two pins, MRi, and measurement over two pins, MRe) and W value (average value of measurement over K teeth of external spline) of the straight cylindrical involute splines with a pressure angle of 45°. This part is applicable to the involute splines with a pressure angle of 45° designed and manufactured in accordance with GB/T 3478.1. 2 Normative references The following documents contain provisions which, through reference in this part of GB/T 3478, constitute provisions of this part. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition of the normative document applies. GB/T 321 Preferred numbers - Series of preferred numbers GB/T 3478.1 Straight cylindrical involute splines - Metric module, side fit - Part 1: Generalities (GB/T 3478.1-2008, ISO 4156-1:2005, MOD) 3 Calculation formulae for measured dimensions of measuring pin Note: Corresponding steel ball is allowed to replace measuring pin. 3.1 Calculation formulae for measured dimensions of measuring pin for involute internal spline 3.1.1 Determination of the diameter DRi of measuring pin (see Figure 1)

Foreword I 1 Scope 2 Normative references 3 Calculation formulae for measured dimensions of measuring pin 4 Calculation formulae for the average value of measurement over K teeth (W) of external spline (see Figure 7) 5 Measured dimensions of measuring pin 6 Limit values of the average value of measurement over K teeth (W)