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JB/T 12478-2018Vertical gearboxes for cranes (English PDF)

起重机用立式减速器

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

April 30, 2018

Implementation date

December 1, 2018

Scope

JB/T 12478-2018 is the English-translated version of 起重机用立式减速器.

JB/T 12478-2018 is the Chinese machinery industry standard covering vertical gearboxes for cranes. It was issued on 30 April 2018 and has been in force since 1 December 2018, replacing JB/T 8905.3-1999.

The document is under the responsibility of the Ministry of Industry and Information Technology. This page is published from the official record of the 2018 edition.

The figures, limits and tables the standard contains are those of the document itself, delivered in full with the English translation.

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Document preview — JB/T 12478-2018

National Standard of the People's Republic of China

Replacing: JB/T 8905.3-1999

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

1 Scope
2 Normative references
3 Type
4 Basic parameters and dimensions
5 Technical requirements
6 Test methods
7 Inspection rules
8 Marking, packaging, transport and storage
Annex A (informative) Method for selecting the speed reducer
Bibliography
Figure 1 Assembly types of the speed reducer
Figure 2 Speed reducer of the QJ-L series
Table 1 Nominal centre distance
Table 2 Transmission ratio
Table 3 Normal module of the gears
Table 4 Overall dimensions and mounting dimensions
Table 5 Load carrying capacity of the speed reducer for mechanism working class M5
Table 6 Load carrying capacity of the speed reducer for continuous duty
Table 7 Allowable misalignment and contact tightness
Table 8 Dimensional tolerance zone, geometrical tolerances and surface roughness of the bearing bores
Table 9 Parallelism tolerance of the axes of the bearing bores
Table 10 Machining dimensional tolerance zone, positional tolerances and surface roughness of the reference bore and reference end face of the gears
Table 11 Machining dimensional tolerance zone, positional tolerances and surface roughness of the reference journal and shoulder
Table 12 Machining dimensional tolerance zone, positional tolerances and surface roughness of the shaft extension diameter and shoulder
Table 13 Fit tolerances of the gear shaft, of the shaft and of the gear bore
Table 14 Dimensional tolerance zone, positional tolerances and surface roughness of the keyway
Table 15 Minimum limit backlash of the gear pair
Table 16 Tightening torque of the bolts
Table 17 Noise values
Table 18 Inspection items

3 Type

4 Basic parameters and dimensions

5 Technical requirements

6 Test methods

7 Inspection rules

8 Marking, packaging, transport and storage

Foreword

This document was issued on 30 April 2018 by the Ministry of Industry and Information Technology of the People's Republic of China, and has been in force since 1 December 2018.

It replaces JB/T 8905.3-1999.

The document is under the responsibility of the Ministry of Industry and Information Technology.

About this edition

JB/T 12478-2018 is the current edition. It was issued on 30 April 2018 and has been in force since 1 December 2018, replacing JB/T 8905.3-1999.

JB/T 8905.3-1999 has been superseded: a specification that still cites it is citing a withdrawn edition.

The interval between issue and effect is the transition period. It exists so that producers, laboratories and buyers can requalify products, revise procedures and use up documentation before the new text becomes the one that applies. The date on this page is the official one announced by the Ministry of Industry and Information Technology of the People's Republic of China.

Edition history and citation

JB/T 12478-2018 replaces JB/T 8905.3-1999. A specification, drawing or test report that cites the older number is pointing at a document that is no longer the one in force, and the two editions can differ in requirements, in test methods or in scope.

Where an edition is replaced, the Chinese standardization system keeps the number and changes the year: the number identifies the subject, the year identifies the text. That is why a citation without a year is ambiguous and a citation with one is not.

Classification and status

JB/T 12478-2018 carries no ICS number in the official record.

The JB/T prefix marks a recommended standard of China's machinery industry, issued by the Ministry of Industry and Information Technology. It is not, in itself, law: it becomes binding when a contract names it, when a regulation or a mandatory standard refers to it, or when a producer declares conformity with it.

The document is under the responsibility of the Ministry of Industry and Information Technology, which is the body that maintains it and that will answer a formal question about its interpretation.

How this standard is designated

The full designation is JB/T 12478-2018. A citation should carry the number with its year, because the year identifies the text that applies.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Cited by

JT/T 1298-2019Port pedestal crane

Similar standards

JB/T 12477-2018|JB/T 12479-2018|JB/T 8905-2018

Editions of JB/T 12478

Edition	Title	Revision	Status
JB/T 12478-2018	Vertical gearboxes for cranes	current edition	Current
JB/T 8905.3-1999	Vertical gearboxes for cranes	previous edition	Superseded

This page sells the current edition, JB/T 12478-2018. Earlier editions are listed for reference only.

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