Standard No.:	GB/T 16848-1997
English Name:	Accuracy of double enveloping worm gearing with straight line generatrix
Chinese Name:	直廓环面蜗杆、蜗轮精度
Chinese Classification:	J17    Gear and gear drive
Professional Classification:	GB    National Standard
Source Content Issued by:	State Technical Supervision Bureau
Issued on:	1997-06-06
Implemented on:	1998-1-1
Status:	to be superseded
Superseded by:	GB/T 16848-2025 Accuracy of hourglass worms and worm gears
Superseded on:	2026-5-1
Target Language:	English
File Format:	PDF
Word Count:	7000 words
Translation Price(USD):	210.0
Delivery:	via email in 1 business day

GB/T 16848-1997 Accuracy of double enveloping worm gearing with straight line generatrix 1 Scope This standard specifies the error definition, code, accuracy grade, gear blank inspection and tolerance, backlash, and drawing indication of enveloping worm with straight line generatrix, worm wheel and their worm gear pairs. This standard is applicable to the power enveloping worm with straight line generatrix transmission with a shaft angle of 90° and a center distance of 80−1,250 mm. 2 Definitions and codes See Table 1 for the errors, as well as the definitions and codes of backlash of the enveloping worm with straight line generatrix, worm wheel and worm gear pairs in this standard. Table 1 Errors, as well as the definitions and codes of backlash of the worm, worm wheel and worm gear pairs

Foreword i 1 Scope 2 Definitions and codes 3 Accuracy grade 4 Requirements for gear blank 5 Inspection and tolerance of worm and worm wheel 6 Inspection and tolerance of worm gear pair 7 Requirements for backlash of worm gear pair 8 Drawing indication Annex A (Informative) Tolerance of main base radius Annex B (Informative) Gear blank tolerance of worm and worm wheel