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Ref. NO. : ISO/R 677-1968 (E)
IS0
I N T E RN AT I O N A L O R G A N I2 AT I ON FOR S TA N DARD IZATl O N
IS0 R ECO M M EN DATI O N
R 677
BASK RACK OF STRAIGHT BEVEL GEARS
FOR GENERAL ENGINEERING AND HEAVY ENGINEERING
1 st EDITION
March 1968
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 677. Basic rack of straight bevel gears for general engineering and
heovy engineering, was drawn up by Technical Committee ISO/TC 60, Gears, the Secretariat of which
is held by the Institut Belge de Normalisation (IBN).
Work on this question by the Technical Committee began in 1961 and led, in 1965, to the
adoption of a Draft IS0 Recommendation.
In November 1965, this Draft IS0 Recommendation (No. 883) was circulated to all the
IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial
nature, by the following Member Bodies :
Australia Hungary Spain
Austria India Switzerland
Belgium Israel Turkey
Brazil
Italy United Kingdom
Chile Netherlands U.S.S.R.
Czechoslovakia
Poland Yugoslavia
France South Africa,
Germany Rep. of
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in March 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 677-1%8 (E
IS0 Recommendation R 677 March 1968
BASIC RACK OF STRAIGHT BEVEL GEARS
FOR GENERAL ENGINEERING AND HEAVY ENGINEERING
1. SCOPE
This IS0 Recommendation describes the basic rack of straight bevel gears 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.
2. DEFINITIONS
2.1 Basic ruck. Rack, the profile of which corresponds to a section of th
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