ISO 53:1998 download free

07-11-2021 comment

ISO 53:1998 download free.Cylindrical gears for general and heavy engineering – Standard basic rack tooth profile.
ISO 53 specifies the characteristics of the standard basic rack tooth profile for cylindrical involute gears (external or internal) for general and heavy engineering.
ISO 53 applies to the standardized modules specified in ISO 54.
The defined profile does not take into account the possible cut-off of the height of internal teeth. This height is to be calculated for each case.
The standard basic rack tooth profile defined in ISO 53 constitutes a geometrical reference for a system of involute gears in order to fix the sizes of their teeth. It does not constitute a definition of a cutter, but a cutter may be defined from this standard basic rack tooth profile in order to realize a conforming profile.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of ISO 53. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on ISO 53 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 54:1996, Cylindrical gears for general and for heavy engineering — Modules.
ISO 1122-1:1998, Vocabulary of gear terms — Part 1: Definitions related to geometry.
3 Terms and definitions
For the purposes of ISO 53, the terms and definitions given in ISO 1122-1 and the following apply.
standard basic rack tooth profile
tooth profile normal section through the teeth of a basic rack which corresponds to an external gear with number 01 teeth z = and diameter d = oo
mating standard rack tooth profile
rack tooth profile symmetrical to the standard basic rack tooth profile about the datum line P-P and displaced by halt
a pitch relative to it
Figure 1.
4 Symbols and units
See table 1.
5.5 The flanks of the standard basic rack tooth profile are inclined at the pressure angle, a1., to a line normal to the
datum line P-P.
5.6 The tip line and the root line are respectively parallel to the datum line P-P at distances of h, and h
53 The active tooth depth. h, of the standard basic rack tooth profile and the mating standard basic rack tooth
profile is equal to 2h..
5.8 The dimensions of the standard basic rack tooth profile use line P-P as the base datum.
5.9 The fillet radius of the standard basic rack, p,, is determined by the standard clearance, c
is the maximum fillet radius of the basic rack:
is the bottom clearance between standard basic rack tooth and mating standard basic rack tooth:
is the pressure angle.
For a basic rack, where a20° and 0,295 rn < 0,396 rn:
where h.,.,. is the dedendum of the basic rack tooth.
The centre of Pip ma is on the centre of the rack space.
NOTE — The actual root fillet, which is outside the active profile, can vary depending on influences such as the method of manufacturing, profile shift and number of teeth. – –
5.10 The dimensions of the standard basic rack tooth profile c,, h, and ir may also be quoted as a multiple of the module m, i.e. relating to m = 1. In this case, they are identified by an asterisk, for example.

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