Kako se bira veličina pera?

By shaft diameter per the DIN 6885 standard lookup table (the equivalent ISO/R 773 recommendation is withdrawn).

Koja naprezanja se provjeravaju?

Shear stress tau=F/(w*L) and bearing stress sigma=F/((h/2)*L).

Koja dužina pera se koristi?

1 do 1,5 puta prečnik vratila. Minimum je dužina glavčine minus skosenike.

Šta je sa koncentracijom naprezanja?

Žljeb za pero kreira Kt=1,5-2,5. Koristi žljebove obrađene krajnjim glodalima za bolji vijek trajanja pri zamaranju.

Mogu li koristiti dva pera?

Da, na 180 stepeni. Pretpostavi da svako nosi 75% zbog tolerancija.

Besplatan inženjerski alat #074

Keyway Calculator — DIN 6885

Key sizes per DIN 6885 (formerly ISO/R 773, withdrawn). Enter shaft diameter and torque to find the standard key size and run simplified shear and bearing stress checks.

DIN 6885Stress CheckAuto-Calc

Results

Standardni klin (š × v)

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Tangencijalna sila

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Shear Stress

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Bearing Stress

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SF (Shear)

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SF (Bearing)

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Tangencijalna sila

Napon smicanja u klinu

Bearing Stress

Standard Key Sizes (DIN 6885)

Key cross-sections below follow DIN 6885. The corresponding ISO recommendation, ISO/R 773, has been withdrawn and is mentioned here for historical reference only; it listed the same sizes but is no longer a current ISO document.

Shaft d (mm)	Klin š×v (mm)
6–8	2×2
8–10	3×3
10–12	4×4
12–17	5×5
17–22	6×6
22–30	8×7
30–38	10×8
38–44	12×8
44–50	14×9
50–58	16×10
58–65	18×11
65–75	20×12
75–85	22×14
85–95	25×14

Dužina klina = 1–1,5× prečnik vratila. Proverite koncentraciju napona na uglovima žljeba (K_t=1.5–2.5). The shear and bearing formulas above are simplified engineering checks assuming uniform stress distribution — they are common design practice, not requirements of any current ISO standard.