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 />
PHONE: 516.328.3300 • FAX: 516.326.8827 • WWW.<strong>SDP</strong>-<strong>SI</strong>.COM<br />
Metric<br />
0 10<br />
I<br />
R<br />
T<br />
110 120<br />
1.863<br />
1.867 1.871<br />
1.992 1.926<br />
1<br />
95 100<br />
1.847<br />
1.850 1.853<br />
1.855 1.858<br />
1.859 1.862<br />
1.914 1.9<strong>17</strong><br />
2<br />
Table <strong>17</strong>-1 Radial Contact Ratio <strong>of</strong> St<strong>and</strong>ard Spur <strong>Gears</strong>, εα (α = 20°)<br />
25 30 35 40 45 50 55 60 65 70 75 80 85 90<br />
1.612<br />
1.654<br />
1.633<br />
1.687<br />
1.670<br />
1.649<br />
1.663 1.684 1.700 1.714<br />
1.674 1.695 1.711 1.725 1.736<br />
1.683 1.704 1.721 1.734 1.745 1.755<br />
1.691 1.712 1.729 1.742 1.753 1.763 1.771<br />
1.698 1.719 1.736 1.749 1.760 1.770 1.778 1.785<br />
1.704 1.725 1.742 1.755 1.766 1.776 1.784 1.791 1.797<br />
1.710 1.731 1.747 1.761 1.772 1.781 1.789 1.796 1.802 1.808<br />
1.714 1.735 1.752 1.765 1.777 1.786 1.794 1.801 1.807 1.812 1.8<strong>17</strong><br />
1.719 1.740 1.756 1.770 1.781 1.790 1.798 1.805 1.811 1.8<strong>17</strong> 1.821 1.826<br />
1.723 1.743 1.760 1.773 1.785 1.794 1.802 1.809 1.815 1.821 1.825 1.830 1.833<br />
1.726 1.747 1.764 1.777 1.788 1.798 1.806 1.813 1.819 1.824 1.829 1.833 1.837 1.840<br />
1.729 1.750 1.767 1.780 1.791 1.801 1.809 1.816 1.822 1.827 1.832 1.836 1.840 1.844<br />
1.732 1.753 1.770 1.783 1.794 1.804 1.812 1.819 1.825 1.830 1.835 1.839 1.843 1.846<br />
1.737 1.758 1.775 1.788 1.799 1.809 1.8<strong>17</strong> 1.824 1.830 1.835 1.840 1.844 1.848 1.852<br />
1.742 1.762 1.779 1.792 1.804 1.813 1.821 1.828 1.834 1.840 1.844 1.849 1.852 1.856<br />
1.797 1.8<strong>17</strong> 1.834 1.847 1.859 1.868 1.876 1.883 1.889 1.894 1.899 1.903 1.907 1.911<br />
3<br />
4<br />
5<br />
6<br />
7<br />
8<br />
9<br />
10<br />
20<br />
15<br />
1.481<br />
1.519 1.557<br />
1.547 1.584<br />
1.567 1.605<br />
1.584 1.622<br />
1.597 1.635<br />
1.609 1.646<br />
1.618 1.656<br />
1.626 1.664<br />
1.633 1.671<br />
1.639 1.677<br />
1.645 1.682<br />
1.649 1.687<br />
1.654 1.691<br />
1.657 1.695<br />
1.661 1.699<br />
1.664 1.702<br />
1.667 1.705<br />
1.672 1.710<br />
1.676 1.714<br />
1.731 1.769<br />
11<br />
12<br />
1.420<br />
12<br />
1.451<br />
15<br />
20 1.489<br />
25 1.516<br />
30 1.537<br />
35 1.553<br />
40 1.567<br />
45 1.578<br />
50 1.588<br />
55 1.596<br />
60 1.603<br />
65 1.609<br />
70 1.614<br />
75 1.619<br />
80 1.623<br />
85 1.627<br />
90 1.630<br />
95 1.634<br />
100 1.636<br />
110 1.642<br />
120 1.646<br />
RACK 1.701<br />
12<br />
<strong>17</strong>.1.4 Helix Angle Factor, Y β<br />
Helix angle factor can be obtained from Equation (<strong>17</strong>-9).<br />
β<br />
When 0 ≤ β ≤ 30°, then Y β = 1 – –––<br />
⎫<br />
120 ⎪ ⎬ (<strong>17</strong>-9)<br />
⎪<br />
When β > 30°, then Y β = 0.75<br />
⎭<br />
13<br />
14<br />
15<br />
T-153<br />
A
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