Section 17 Strength and Durability of Gears - SDP/SI
Section 17 Strength and Durability of Gears - SDP/SI
Section 17 Strength and Durability of Gears - SDP/SI
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ELEMENTS OF METRIC GEAR TECHNOLOGY<br />
I<br />
Material<br />
Quenched<br />
<strong>and</strong><br />
Tempered<br />
Alloy<br />
Steel<br />
Structural<br />
Carbon<br />
Steel<br />
Structural<br />
Alloy<br />
Steel<br />
PHONE: 516.328.3300 • FAX: 516.326.8827 • WWW.<strong>SDP</strong>-<strong>SI</strong>.COM<br />
Table <strong>17</strong>-12 <strong>Gears</strong> without Case Hardening – Allowable Hertz Stress (continued)<br />
<br />
SMn443<br />
<br />
Arrows indicate the ranges<br />
<br />
SNC836<br />
SCM435<br />
<br />
<br />
SCM440<br />
<br />
Lower Limit <strong>of</strong><br />
Tensile <strong>Strength</strong><br />
kgf/mm 2<br />
(Reference)<br />
71<br />
74<br />
77<br />
81<br />
84<br />
87<br />
90<br />
93<br />
97<br />
100<br />
103<br />
106<br />
110<br />
113<br />
1<strong>17</strong><br />
121<br />
126<br />
130<br />
135<br />
Table <strong>17</strong>-13 <strong>Gears</strong> with Induction Hardening – Allowable Hertz Stress<br />
Material<br />
Heat Treatment<br />
before<br />
Induction Hardening<br />
Surface<br />
Hardness<br />
HV (Quenched)<br />
S43C<br />
S48C<br />
SMn443<br />
SCM435<br />
SCM440<br />
SNC836<br />
SNCM439<br />
<br />
SNCM439<br />
<br />
HB<br />
220<br />
230<br />
240<br />
250<br />
260<br />
270<br />
280<br />
290<br />
300<br />
310<br />
320<br />
330<br />
340<br />
350<br />
360<br />
370<br />
380<br />
390<br />
400<br />
Normalized<br />
Quenched<br />
<strong>and</strong><br />
Tempered<br />
Quenched<br />
<strong>and</strong><br />
Tempered<br />
Surface<br />
Hardness<br />
HV<br />
231<br />
242<br />
252<br />
263<br />
273<br />
284<br />
295<br />
305<br />
316<br />
327<br />
337<br />
347<br />
358<br />
369<br />
380<br />
391<br />
402<br />
413<br />
424<br />
420<br />
440<br />
460<br />
480<br />
500<br />
520<br />
540<br />
560<br />
580<br />
600 <strong>and</strong> above<br />
500<br />
520<br />
540<br />
560<br />
580<br />
600<br />
620<br />
640<br />
660<br />
680 <strong>and</strong> above<br />
500<br />
520<br />
540<br />
560<br />
580<br />
600<br />
620<br />
640<br />
660<br />
680 <strong>and</strong> above<br />
σ H lim<br />
kgf/mm 2<br />
σ H lim<br />
kgf/mm 2<br />
77<br />
80<br />
82<br />
85<br />
87<br />
90<br />
92<br />
93.5<br />
95<br />
96<br />
96<br />
99<br />
101<br />
103<br />
105<br />
106.5<br />
107.5<br />
108.5<br />
109<br />
109.5<br />
109<br />
112<br />
115<br />
1<strong>17</strong><br />
119<br />
121<br />
123<br />
124<br />
125<br />
126<br />
T-167<br />
70<br />
71.5<br />
73<br />
74.5<br />
76<br />
77.5<br />
79<br />
81<br />
82.5<br />
84<br />
85.5<br />
87<br />
88.5<br />
90<br />
92<br />
93.5<br />
95<br />
96.5<br />
98<br />
Continued from the previous page<br />
R<br />
T<br />
1<br />
2<br />
3<br />
4<br />
5<br />
6<br />
7<br />
8<br />
9<br />
10<br />
11<br />
12<br />
13<br />
14<br />
15<br />
A
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