GB/T 11357-2020 in English

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Standard No:	GB/T 11357-2020
Document status:	VALID
Title in English:	Quality, roughness and balance of transmission pulleys
Title in Chinese:	带轮的材质、表面粗糙度及平衡
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-04-28
Implemented on:	2021-03-01
Superseding:	GB/T 11357-2008 Quality roughness and balance of transmission pulleys
Professional Classification:	GB-National Standard
Related Topics:	Surface roughness material GB T11357 2008 Rough+ roughness Surface Roughness Leakage Profiler with roughness Roughness n7 material balance rate Surface roughness n7 Roughness of the film surface What is the roughness of the film? Coarse balance surface roughness on material surface What kind of film is used for rough surface n7 surface roughness Surface Roughness of Sputtering Target hole balance n7 roughness balance rough surface rough balance GBT11357 GB/T 11357-1989 GB/T 11357-2008 GB/T 11357-2020 Rough flat The impeller is double-sided dynamically balanced and single-sided balanced Roughness n7 means Evaluation of surface roughness Surface roughness of plastic parts Rubber parts surface roughness Rubber product surface roughness Surface roughness evaluation gb/t 11357-2008 gbt11357 gb/t 11357

《GB/T 11357-2020带轮的材质、表面粗糙度及平衡》由TC428（全国带轮与带标准化技术委员会）归口，主管部门为中国机械工业联合会。

Introduction

Interpretation of the core content of the standard

GB/T 11357-2020 replaces the 2008 version of the standard. The main technical changes include:

Material expansion: New modern materials such as aluminum alloy and engineering plastics
Precision improvement: The surface roughness Ra value of high-performance transmission is increased from 3.2μm to 1.6μm
Balancing specification: Introducing the aspect ratio (l/d) as the basis for selecting the balancing method

Parameters	2008 version	2020 version
Material category	Class 4	Class 6
Wheel groove roughness (high performance)	Not specified	1.6μm
Balance judgment basis	Speed single factor	Aspect ratio + speed

Automobile engine Multi-V pulley case:

Calculate the critical speed according to the formula n₁ = 1.58×10¹¹/ld:

Forced static balancing when the aspect ratio is ≤0.2
Dynamic balancing is recommended for synchronous pulleys with a speed of ＞6000rpm
Residual unbalance ≤0.2% equivalent mass

Newly designed products from March 2021 will be implemented according to the 2020 version
Process adjustments for existing production lines should be completed within 6 months
Focus on monitoring the wear cycle of tool processing for V-belt pulley grooves

More samples: YD/T 3934-2021 QC/T 942-2021 GB 18306-2015

Sample only — not a preview of GB/T 11357-2020

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