7021 ACD/HCP4A SKF

Kích thước và Thông số kỹ thuật của Vòng bi cầu tiếp xúc có độ chính xác cao 7021 ACD/HCP4A SKF:

d – 10 mm

D – 22 mm

B – 6 mm

d₁ – 14 mm

d₂ – 14 mm

D₁ – 18 mm

r_1,2 – min. – 0.3 mm

r_3,4 – min. – 0.2 mm

a – 6.8 mm

d_a – min. – 12 mm

d_b – min. – 12 mm

D_a – max. – 20 mm

D_b – max. – 20.6 mm

r_a – max. – 0.3 mm

r_b – max. – 0.2 mm

d_n – 14.8 mm

Basic dynamic load rating – C – 2.4 kN

Basic static load rating – C₀ – 1.1 kN

Fatigue load limit – P_u – 0.045 kN

Limiting speed for grease lubrication – 70000 r/min

Limiting speed for oil lubrication – 110000 mm/min

Ball – D_w – 3.175 mm

Ball – z – 12

G_ref – 0.12 cm3

Calculation factor – e – 0.68

Calculation factor – Y₂ – 0.87

Calculation factor – Y₀ – 0.38

Calculation factor – X₂ – 0.41

Calculation factor – Y₁ – 0.92

Calculation factor – Y₂ – 1.41

Calculation factor – Y₀ – 0.76

Calculation factor – X₂ – 0.67

Preload class A – G_A – 15 N

Preload class B – G_B – 30 N

Preload class C – G_C – 60 N

Preload class D – G_D – 120 N

Calculation factor – f – 1.03

Calculation factor – f₁ – 0.98

Calculation factor – f_2A – 1

Calculation factor – f_2B – 1.07

Calculation factor – f_2C – 1.12

Calculation factor – f_2D – 1.17

Calculation factor – f_HC – 1.04

Preload class A – 32 N/micron

Preload class B – 42 N/micron

Preload class C – 54 N/micron

Preload class D – 72 N/micron

Mass bearing – 0.009 kg

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