7224 CDGA/P4A

These super-precision, high-capacity, single row angular contact ball bearings accommodate radial and axial loads acting simultaneously, where the axial load acts in one direction only. They are designed to accommodate heavy loads at relatively high speeds under low to moderate operating temperatures. Being universally matchable, they can be used together in arrangements to provide effective load sharing, within a predetermined preload range, without the use of shims or similar devices. Very high running accuracy Very high load carrying capacity Relatively high speed and stiffness Universally matchable

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Product Introduction

Dimensions - 7224 CDGA/P4A

Dimensions

d	120 mm	Bore diameter
D	215 mm	Outside diameter
B	40 mm	Width
d₁	150.3 mm	Shoulder diameter of inner ring (large side face)
d₂	150.3 mm	Shoulder diameter of inner ring (small side face)
D₁	186.7 mm	Shoulder diameter of outer ring (large side face)
r_1,2	min.2.1 mm	Chamfer dimension
r_3,4	min.1.1 mm	Chamfer dimension
a	42.7 mm	Distance from side face to pressure point

Abutment dimensions - 7224 CDGA/P4A

Abutment dimensions

d_a	min.132 mm	Diameter of shaft abutment
d_b	min.132 mm	Diameter of shaft abutment
D_a	max.203 mm	Diameter of housing abutment
D_b	max.208 mm	Diameter of housing abutment
r_a	max.2 mm	Radius of fillet
r_b	max.1 mm	Radius of fillet
d_n	158.2 mm	Position of oil nozzle

Calculation data

Basic dynamic load rating	C	199 kN
Basic static load rating	C₀	193 kN
Fatigue load limit	P_u	6.3 kN
Attainable speeds		Refer to catalogue data or contact SKF for the attainable speeds
Contact angle	α	15 °
Ball diameter	D_w	30.162 mm
Number of rows	i	1
Number of balls (per bearing)	z	15
Reference grease quantity (per bearing)	G_ref	69.084 cm³

Preload and stiffness (back-to-back, face-to-face)
Preload class		A
Preload when unmounted	G	750 N
Axial stiffness		139 N/µm

Correction factors for preload calculation
Correction factor dependent on bearing series and size	f	1.08
Correction factor dependent on contact angle	f₁	1
Correction factor, preload class A	f_2A	1
Correction factor for hybrid bearings	f_HC	1

Factors for equivalent bearing load calculation
Calculation factor for equivalent loads	f₀	14.6
Additional factors for equivalent loads		Refer to Notes 1 and 2 below

Characteristics of Precision Contact Bearings

Precision contact bearings are engineered with exceptional accuracy to ensure optimal performance in various mechanical applications. These bearings feature tight dimensional tolerances and precise geometric shapes, which contribute to their high rotational accuracy and low noise levels. The materials used in their construction, often high-quality steels or ceramics, are chosen for their durability and resistance to wear, ensuring long service life even under demanding conditions. Precision contact bearings typically include configurations such as ball bearings, roller bearings, and needle bearings, each designed to address specific load and speed requirements. Their design also incorporates advanced lubrication systems to reduce friction and heat generation, thereby enhancing efficiency and reliability.

Advantages of Precision Contact Bearings

The primary advantage of precision contact bearings lies in their ability to sustain high precision under various operating conditions. They offer superior load-carrying capacity, making them ideal for applications requiring heavy loads while maintaining high speeds. The precision of these bearings minimizes vibration and noise, which is critical in sensitive environments such as medical equipment or precision instruments. Additionally, their robust construction ensures reliability and longevity, reducing maintenance costs and downtime. The use of advanced materials and lubrication techniques further enhances their performance, providing resistance to corrosion and wear. This combination of features makes precision contact bearings an indispensable component in precision engineering and high-performance machinery.

NO.	d[mm]	D[mm]	B[mm]
71932 ACDGB/P4A	160	220	28
71932 ACDGA/P4A	160	220	28
71932 ACD/P4ATBTB	160	220	84
71932 ACD/P4AQBCA	160	220	112
71932 ACD/P4ADGA	160	220	56
71932 ACD/P4ADBC	160	220	56
71932 ACD/P4ADBB	160	220	56
71932 ACD/P4ADBA	160	220	56
71932 ACD/P4A	160	220	28
71932 ACD/HCP4ADT	160	220	56
71932 ACD/HCP4ADGA	160	220	56
7224 CDGA/P4A	120	215	40
7224 CD/P4QBCA	120	215	160
7224 CD/P4DBA	120	215	80
7224 CD/P4ADGA	120	215	80
7224 CD/P4ADFB	120	215	80
7224 CD/P4ADBB	120	215	80
7224 CD/P4A	120	215	40
7224 CD/HCP4ADGA	120	215	80
7224 CD/HCP4A	120	215	40
7224 ACDGA/P4A	120	215	40
7224 ACDGA/HCP4A	120	215	40
7224 ACD/P4ADT	120	215	80
7224 ACD/P4ADGB	120	215	80
7224 ACD/P4ADGA	120	215	80
7224 ACD/P4ADBA	120	215	80
7224 ACD/P4A	120	215	40
7224 ACD/HCP4A	120	215	40
S71930 CD/P4AQBCD	150	210	112
S71930 CD/P4ADBA	150	210	56

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71932 CDGA/P4