GB/T 11357-2020Quality, roughness and balance of transmission pulleys (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 11357-2008 "Material, roughness and balance of

transmission pulleys". Compared with GB/T 11357-2008, the main technical

changes except for editorial changes are as follows:

- MODIFY the normative references (see Clause 2);

- ADD commonly used materials of pulleys (see Table 1);

- ADD the specification of V-pulley and V-ribbed pulley grooves, all pulley

bores, and working surface roughness under high-performance drives (see

Table 2 of this Standard, Table 1 of the 2008 edition);

- ADD the schematic diagram of static balancing and dynamic balancing (see

Figure 1);

- MODIFY the selection of balancing method (see 5.4 of this Standard, 5.4

of the 2008 edition);

- MODIFY the symbol of pulley rim edge width (see 5.4, 5.7 of this Standard,

1 Scope

This Standard specifies the material, quality requirements, surface roughness

and balance of pulleys.

This Standard applies to V-pulleys, V-ribbed pulleys, flat pulleys and

synchronous pulleys. It does not apply to variable-speed pulleys with movable

rims.

2 Normative references

The following referenced documents are indispensable for the application of

this document. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any

amendments) applies.

GB/T 9239.1 Mechanical vibration - Balance quality requirements for rotors

in a constant (rigid) state - Part 1: Specification and verification of balance

tolerances (GB/T 9239.1-2006, ISO 1940-1:2003, IDT)

3 Material and quality requirements of pulleys

The pulley can be made of materials that can be processed to meet the

dimensions and tolerance specified by the standard, and can withstand various

working conditions (including heating, mechanical stresses, abrasion and other

environments) without damage. The pulley material shall be suitable for

dissipating the heat generated by the transmission. See Table 1 for commonly

used materials for pulleys.

Table 1 -- Commonly used materials of pulleys

Pulley type Commonly used materials

V-pulley, flat pulley

Cast iron, steel, aluminum alloy, copper alloy and

engineering plastics, etc.

V-ribbed pulley

Synchronous pulley

Key:

l - the pulley rim edge width, in millimeters (mm);

d - the diameter (datum diameter or effective diameter) of the pulley, in millimeters (mm);

n - the revolving speed of the pulley, in thousand revolutions per minute (kr/min).

Figure 2 -- Diagram of Selection of balance method