GB/T 39545.4-2023Design and selection of components for enclosed gear drives—Part 4: Flexible couplings unbalance classification (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.

This document is Part 4 of GB/T 39545 "Parts Design and Selection of Closed Gear Transmissions". GB/T 39545 has The following parts were released.

--- Part 1: General components;

--- Part 3: Keyless fit connection of shaft and hub;

--- Part 4: Flexible coupling balance level.

Introduction

GB/T 39545 "Design and Selection of Components for Closed Gear Transmissions" is a set of specifications applicable to different types of industrial gear transmissions.

The basic standards for the design and selection of device parts, aiming to standardize the design and selection of various closed gear transmission parts and main supporting parts.

The criteria for the selection of methods are proposed to consist of five parts.

--- Part 1: General components. The purpose is to consider the application characteristics of the closed gear transmission, and provide general-purpose The design and selection of components provides a complete set of normative technical guidance documents to improve the level of design, manufacturing and application, and provide Improve the basic skills of the design and manufacture of closed gear transmissions in my country to lay the foundation.

--- Part 2: Keyed connection of shaft and hub. The purpose is to supplement the geometric shape and position tolerance and inspection method of the keyway, etc.

To further improve the standard system of key connections in my country, improve the quality of key connections, and better ensure the quality of closed gear transmissions safe and reliable operation.

--- Part 3: Keyless fit connection of shaft and hub. The purpose is to meet the needs of transformation and upgrading, improve technology and ease of use, and more To ensure the safe and reliable operation of closed gear transmission.

--- Part 4: Flexible coupling balance level. The purpose is to increase the way to solve the unbalanced problem of the coupling and promote the flexibility of our country.

The design, manufacture and application level of couplings have been improved.

--- Part 5: Static and dynamic characteristics of flexible couplings. The purpose is to standardize and popularize the static and dynamic characteristics of flexible couplings A revolutionary calculation method to meet the increasing application requirements of dynamic analysis of closed gear transmission and host system.

Compared with the general standards, these standards have the following main features: for the requirements of the application characteristics of closed gear transmissions, all components All the stress calculations are revised on the basis of the general design, and the strength calculation takes into account the peak load overload damage in addition to the fatigue failure.

The impact of damage; the focus of design and selection of these parts derived from practical experience is given; it is the first standard formulated in China, and it has a The standard has been further supplemented and improved; from the perspective of the system, the standards for couplings and connections of important related parts have been supplemented; it covers closed gears All major components of the transmission; the relevant methods in the document are also applicable to the design and selection of components of non-enclosed gear transmissions.

GB/T 39545 provides a relatively complete and practical set of specifications for design and selection methods for the design of parts of closed gear transmissions in my country. Fans and guides.

Flexible couplings are usually assembled from several parts with radial clearance and eccentricity between the mounting reference planes. it is these gaps Factors such as eccentricity and eccentricity cause the main inertial axis of the coupling to deviate from the axis of rotation, resulting in potential unbalance. This document gives the design specification The maximum unbalance that may exist in the coupling is obtained through theoretical calculation, and the coupling is determined according to the selection method specified in this document.

The balance accuracy level of the coupling can be judged at the design stage whether the coupling can meet the unbalance requirements in practical applications;

Analyze the unbalanced influence of each factor, find out the main factors, and make effective improvements to the design.

This document is used together with GB/T 9239.1-2006 applicable to the balance quality requirements of rigid rotors.

1 Scope

This document specifies the symbols for the balance class of flexible couplings, the potential unbalance of the coupling and the balance accuracy class, the balance accuracy of the coupling Degree selection, potential unbalance influence factors of unbalanced couplings, potential unbalance influence of balanced couplings factors and determination of the potential unbalance of the coupling.

This document applies to the selection of balance accuracy grades and the calculation of potential unbalance for flexible couplings used in closed gear transmissions.

Note: See Appendix K for examples of applications using both this document and the method of GB/T 9239.1-2006.

This document does not cover the effects of unbalanced quantities of:

--- Axis runout;

--- Keys protruding from hubs or shafts;

--- Unfilled keyway or pin groove;

---Coupling installation surface clearance;

---Heterogeneous materials;

--- Bend reference plane.

This document does not apply to the calculation of potential unbalance when elastic couplings are used to compensate the relative displacement of two axes through elastic deflection.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 9239.1-2006 Mechanical vibration constant (rigid) rotor balance quality requirements Part 1: Specifications and balance tolerances test

3 Terms and Definitions

The following terms and definitions apply to this document.