SIST ISO 677:1998

Straight bevel gears for general engineering and heavy engineering -- Basic rack

Specifies the dimensional characteristics of the basic rack, having a constant bottom clearance. In these gear pairs the tip angle of one gear is equal to the difference between the designed shaft angle and the root angle of the mating gear. Gives profile and some notes and defines the terms basic rack and reference line.

Engrenages coniques à denture droite de mécanique générale et de grosse mécanique -- Crémaillère de référence

Ravnozobi stožčasti zobniki za splošno in težko strojegradnjo - Osnovni profil za zobnice

General Information

• Status: Published
• Publication Date: 31-May-1998
• ICS: 21.200 - Gears
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jun-1998
• Due Date: 01-Jun-1998
• Completion Date: 01-Jun-1998
• Directive: 2016/426 - REGULATION (EU) 2016/426 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 9 March 2016 on appliances burning gaseous fuels and repealing Directive 2009/142/EC
• Ref Project: ISO 677:1976 - Straight bevel gears for general engineering and heavy engineering — Basic rack

Overview

ISO 677:1976 - "Straight bevel gears for general engineering and heavy engineering - Basic rack" defines the dimensional characteristics and profile of the basic rack used as the reference tooth form for straight bevel gears with involute teeth. The standard is concerned with a basic rack that has a constant bottom clearance and establishes how rack dimensions scale with module or diametral pitch. It also defines the term reference line and gives the relationship between the basic-rack profile and the cutting tools used to generate bevel teeth.

Key topics and requirements

• Scope: Dimensional characteristics of the basic rack for straight bevel gears used in general and heavy engineering; applies for gear pairs where the tip angle of one gear equals the difference between the designed shaft angle and the root angle of the mating gear.
• Profile form: Standard basic-rack profile corresponds to bevel gears with involute teeth and substantially straight flanks.
• Key geometric parameters:
  • Pressure angle: 20° (standard value for the profile).
  • Tooth height: specified as 2.20 × module (dimensions in millimetres when module is used).
  • Tooth tip position and thickness: tooth tips lie at a distance from the reference line equal to the module; tooth thickness measured on the reference line equals the width of the space.
  • Root fillet radius: normally up to 0.30 × module; where meshing permits this may be increased up to 0.35 × module.
• Scaling: Profile dimensions shown for module m = 1 (or diametral pitch P = 1) must be multiplied by the module or by the inverse of the diametral pitch for other sizes.
• Manufacturing relation: The standard explains how the basic-rack profile relates to the cutting tools that generate bevel teeth (the cut tooth is a portion of an octoid), useful for tool design and machining processes.
• Definitions: Clear definitions of basic rack and reference line for consistent application.

Applications and who uses it

ISO 677 is practical for:

• Gear designers and mechanical engineers specifying straight bevel gear geometry.
• Gear manufacturers and toolmakers who need the reference rack profile for cutter design and gear cutting.
• Quality/inspection engineers using the standard profile and dimensional rules for acceptance and interchangeability.
• Industries using heavy-duty bevel gearing (e.g., industrial gearboxes, marine, mining, heavy machinery) where standardized tooth form and reliable meshing are required.

Related standards

• ISO 678 - Straight bevel gears for general engineering and heavy engineering - Modules and diametral pitches (referenced for module / pitch sizing).
• ISO Recommendation R 677-1968 - predecessor document transformed into ISO 677:1976.

Keywords: ISO 677, straight bevel gears, basic rack, bevel gear standards, involute teeth, gear profile, module, diametral pitch.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-1998
5DYQR]RELVWRåþDVWL]REQLNL]DVSORãQRLQWHåNRVWURMHJUDGQMR2VQRYQLSURILO]D
]REQLFH
Straight bevel gears for general engineering and heavy engineering -- Basic rack
Engrenages coniques à denture droite de mécanique générale et de grosse mécanique -
- Crémaillère de référence
Ta slovenski standard je istoveten z: ISO 677:1976
ICS:
21.200 Gonila Gears
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL STANDARD
IN ’TERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXK;IYHAPOLIHAR OPI-AHM3AUMR I-IO CTAHHAPTW3ALWi~ORGANlSATlON INTERNATIONALE DE NORMALISATION
Straight bevel gears for general engineering and heavy
engineering - Basic rack
Engrenages coniques 6 denture droite de mkanique gh&ale et de grosse mtkanique - Cre ’maille ’re
de re ’fkence
First edition - 1976-06 -15
~-
Ref. No. IS0 677-1976 (E)
UDC 621.833.2
Descriptors : gears, bevel gears, basic racks, profiles.
Price based on 2 pages
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 Member Bodies). The work of developing
International Standards is carried out through OS0 Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up has the right to be represented on that Committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the Technical Committees are circulated
to the Member Bodies for approval before their acceptance as International
Standards by the IS0 Council.
Prior to 1972, the results of the work of the Technical Committees were published
as IS0 Recommendations; these documents are now in the process of being trans-
formed into International Standards. As part of this process Technical
Committee ISO/TC 60 has reviewed IS0 Recommendation R 677 and found it
technically suitable for transformation. International Standard ISO 677 therefore
replaces IS0 Recommendation R 677-1968 to which it is technically identical.
SSO Recommendation R 677 was approved by the Member Bodies of the following
countries :
Australia Germany
Austria l-lungary Spain
Belgium India Switzerland
Brazil Israel Turkey
Chile Italy United Kingdom
Czechoslovakia Netherlands U.S.S.R.
France Poland Yugoslavia
No Member Body expressed disapproval of the Recommendation.
The Member Body of the following country disapproved the transformation of
lSO/R 677 into an International Standard :
Czechoslovakia
0 International Organization for Standardization, 1976 @
Printed in Switzerland
INTERNATIONAL STANDARD
IS0 677-1976 (
...

INTERNATIONAL STANDARD
IN ’TERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXK;IYHAPOLIHAR OPI-AHM3AUMR I-IO CTAHHAPTW3ALWi~ORGANlSATlON INTERNATIONALE DE NORMALISATION
Straight bevel gears for general engineering and heavy
engineering - Basic rack
Engrenages coniques 6 denture droite de mkanique gh&ale et de grosse mtkanique - Cre ’maille ’re
de re ’fkence
First edition - 1976-06 -15
~-
Ref. No. IS0 677-1976 (E)
UDC 621.833.2
Descriptors : gears, bevel gears, basic racks, profiles.
Price based on 2 pages
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 Member Bodies). The work of developing
International Standards is carried out through OS0 Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up has the right to be represented on that Committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the Technical Committees are circulated
to the Member Bodies for approval before their acceptance as International
Standards by the IS0 Council.
Prior to 1972, the results of the work of the Technical Committees were published
as IS0 Recommendations; these documents are now in the process of being trans-
formed into International Standards. As part of this process Technical
Committee ISO/TC 60 has reviewed IS0 Recommendation R 677 and found it
technically suitable for transformation. International Standard ISO 677 therefore
replaces IS0 Recommendation R 677-1968 to which it is technically identical.
SSO Recommendation R 677 was approved by the Member Bodies of the following
countries :
Australia Germany
Austria l-lungary Spain
Belgium India Switzerland
Brazil Israel Turkey
Chile Italy United Kingdom
Czechoslovakia Netherlands U.S.S.R.
France Poland Yugoslavia
No Member Body expressed disapproval of the Recommendation.
The Member Body of the following country disapproved the transformation of
lSO/R 677 into an International Standard :
Czechoslovakia
0 International Organization for Standardization, 1976 @
Printed in Switzerland
INTERNATIONAL STANDARD
IS0 677-1976 (E)
traight bevel gears for general engineering and heavy
engineering - Basic rack
1 SCOPE AND FIELD OF APPLICATION 3 PROFILE
This International Standard specifies the dimensional Figure 1 represents the profile of the basic rack for gears
characteristics of the basic rack of straight bevel gears, for of module m = 1 and of diametral pitch P = 1.
ge
...

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXI1JYHAPOfiHASI OPI-AHM3ALJMII l-70 CTAHAAPTM3AUMM -ORGANISATION INTERNATIONALE DE NORMALISATION
Engrenages coniques à denture droite de mécanique
générale et de grosse mécanique - Crémaillère de référence
Straight bevel gears for general engineering and heavy engineering - Basic rack
Première édition - 1976-06 -15
Réf. no : BS0 677-1976 (F)
CDU 621.833.2
Descripteurs : engrenage, engrenage conique, crémaiIli!re de référence, profil.
Prix basé sur 2 pages
AVANT-PROPOS
L’ISO (Organisation Internationale de Normalisation) est une fédération mondiale
d’organismes nationaux de normalisation (Comités Membres ISO). L’élaboration des
Normes Internationales est confiée aux Comités Techniques ISO. Chaque Comité
Membre intéressé par une étude a le droit de faire partie du Comité Technique
correspondant. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO, participent également aux travaux.
Les Projets de Normes Internationales adoptés par les Comités Techniques sont
soumis aux Comités Membres pour approbation, avant leur acceptation comme
Normes Internationales par le Conseil de I’ISO.
Avant 1972, les résultats des travaux des Comités Techniques étaient publiés
comme Recommandations ISO; maintenant, ces documents sont en cours de trans-
formation en Normes Internationales. Compte tenu de cette procédure, le Comité
Technique ISO/TC 60 a examiné la Recommandation ISO/R 677 et est d’avis
qu’elle peut, du point de vue technique, être transformée en Norme Internationale.
La présente Internationale remplace donc la Recomman-
Norme
dation ISO/R 677-1968 à laquelle elle est techniquement identique.
La Recommandation ISO/R 677 avait été approuvée par les Comités Membres des
pays suivants :
Afrique du Sud, Rép. d’ Espagne Pologne
Al lemagne France Royaume-Uni
Australie Hongrie Suisse
Autriche Inde Tchécoslovaquie
Belgique Israël Turquie
B rési I Italie U.R.S.S.
Chili Pays-Bas Yougoslavie
Aucun Comité Membre n’avait désapprouvé la Recommandation.
Le Comité Membre du pays suivant a désapprouvé la transformation de la Recom-
mandation lSO/R 677 en ‘Norme Internationale :
Tchécoslovaquie
(3 Cârgawisatisn internal%swaPe de Normdisation, 19‘76 Q
Imprimé en Suisse
SO 677-1976 (F)
NORME INTERNATIONALE
Engrenages coniques à denture droite de mécanique
générale et de grosse mécanique - Crémaillère de référence
3 PROFIL
1 OBJET ET DOMAINE D’APPLICATION
La figure 1 représente le profil de la crémaillère de réfé-
La présente Norme Internationale spécifie les caractéris-
rence des engrenages de module m = 1 et de diametral
tiques dimensionnelles de la c
...

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXI1JYHAPOfiHASI OPI-AHM3ALJMII l-70 CTAHAAPTM3AUMM -ORGANISATION INTERNATIONALE DE NORMALISATION
Engrenages coniques à denture droite de mécanique
générale et de grosse mécanique - Crémaillère de référence
Straight bevel gears for general engineering and heavy engineering - Basic rack
Première édition - 1976-06 -15
Réf. no : BS0 677-1976 (F)
CDU 621.833.2
Descripteurs : engrenage, engrenage conique, crémaiIli!re de référence, profil.
Prix basé sur 2 pages
AVANT-PROPOS
L’ISO (Organisation Internationale de Normalisation) est une fédération mondiale
d’organismes nationaux de normalisation (Comités Membres ISO). L’élaboration des
Normes Internationales est confiée aux Comités Techniques ISO. Chaque Comité
Membre intéressé par une étude a le droit de faire partie du Comité Technique
correspondant. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO, participent également aux travaux.
Les Projets de Normes Internationales adoptés par les Comités Techniques sont
soumis aux Comités Membres pour approbation, avant leur acceptation comme
Normes Internationales par le Conseil de I’ISO.
Avant 1972, les résultats des travaux des Comités Techniques étaient publiés
comme Recommandations ISO; maintenant, ces documents sont en cours de trans-
formation en Normes Internationales. Compte tenu de cette procédure, le Comité
Technique ISO/TC 60 a examiné la Recommandation ISO/R 677 et est d’avis
qu’elle peut, du point de vue technique, être transformée en Norme Internationale.
La présente Internationale remplace donc la Recomman-
Norme
dation ISO/R 677-1968 à laquelle elle est techniquement identique.
La Recommandation ISO/R 677 avait été approuvée par les Comités Membres des
pays suivants :
Afrique du Sud, Rép. d’ Espagne Pologne
Al lemagne France Royaume-Uni
Australie Hongrie Suisse
Autriche Inde Tchécoslovaquie
Belgique Israël Turquie
B rési I Italie U.R.S.S.
Chili Pays-Bas Yougoslavie
Aucun Comité Membre n’avait désapprouvé la Recommandation.
Le Comité Membre du pays suivant a désapprouvé la transformation de la Recom-
mandation lSO/R 677 en ‘Norme Internationale :
Tchécoslovaquie
(3 Cârgawisatisn internal%swaPe de Normdisation, 19‘76 Q
Imprimé en Suisse
SO 677-1976 (F)
NORME INTERNATIONALE
Engrenages coniques à denture droite de mécanique
générale et de grosse mécanique - Crémaillère de référence
3 PROFIL
1 OBJET ET DOMAINE D’APPLICATION
La figure 1 représente le profil de la crémaillère de réfé-
La présente Norme Internationale spécifie les caractéris-
rence des engrenages de module m = 1 et de diametral
tiques dimensionnelles de la c
...