Roda Gigi Cacing.docx

PERENCANAAN RODA GIGI CACING

Pressure angle yang biasa digunakan pada roda gigi cacing yaitu dan 30°. Pressure angle untuk standar JIS yang biasa digunakan yaitu 20°.

Axial Module Worm Gears Perhitungan Axial Module System Worm Gears Diketahui: Axial module worm and gears (𝑚𝑥 ) = 3 Normal pressure angle worm and gears (𝛼𝑛 ) = 20° Number of threads (𝑧𝑊 ) = 2 Number of teeth (𝑧2 ) = 30 (R) Coeffcient of profle shift worm (𝑥𝑎2 ) = − Coeffcient of profle shift threads (𝑥𝑎2 ) = 0 Pembahasan, Standard pitch diameter worm (𝑑1 ), 𝑑1 = 𝑄 × 𝑚𝑥 = 14,6 × 3 𝑚𝑚 = 44 𝑚𝑚 Diameter factor worm (Q) 𝑄 = 𝑑1 /𝑚𝑥 = 44 𝑚𝑚/3 𝑚𝑚 = 14,6 Standard pitch diameter threads (𝑑2 ), 𝑑2 = 𝑧2 × 𝑚𝑥 = 30 × 3 𝑚𝑚 = 90 𝑚𝑚 Lead Angle (𝛾), 𝑚𝑥 𝑧𝑊 3 𝑚𝑚 × 2 𝛾 = 𝑡𝑎𝑛−1 ( ) = 𝑡𝑎𝑛−1 ( ) = 7,765167° 𝑑1 44 𝑚𝑚 Center distance (𝑎𝑥 ) cara pertama, 𝑎𝑥 =

𝑑1 + 𝑑2 44 𝑚𝑚 + 90 𝑚𝑚 + (𝑥𝑎2 × 𝑚𝑥 ) = + (0 × 3) = 67 𝑚𝑚 2 2

Center distance (𝑎𝑥 ) cara kedua, 𝑎𝑥 =

𝑑1 + 𝑑2 𝑝𝑛 𝑧𝑔 𝑧𝑊 = 𝑎𝑥 = ( + ) 2 2𝜋 cos 𝛾 sin 𝛾

𝑝𝑥 = 𝜋𝑚𝑛 = 3,14 × 3 𝑚𝑚 = 9,42 𝑚𝑚 𝑝𝑛 = 𝑝𝑥 cos 𝛾 = 9,42 × cos 7,765167° = 9,33 𝑚𝑚 𝑎𝑥 =

9,33 30 2 ×( + ) = 66,97 𝑚𝑚 ≈ 67 𝑚𝑚 2 × 3,14 cos 7,765167° sin 7,765167°

Addendum worm (ℎ𝑎1 ), ℎ𝑎1 = 1,00 × 𝑚𝑥 = 1,00 × 3 = 3 𝑚𝑚 Addendum wheel (ℎ𝑎2 ), ℎ𝑎2 = (1,00 + 𝑥𝑎2 ) × 𝑚𝑥 = (1,00 + 0) × 3 = 3 𝑚𝑚 Whole depth worm and wheel (h), ℎ = 2,25 × 𝑚𝑥 = 2,25 × 3 𝑚𝑚 = 6,75 𝑚𝑚 Outside diameter worm (

),

Outside diameter wheel (

),