S71930 CD/P4AQBCD

These sets of four matched super-precision angular contact ball bearings are available as universally matchable bearings or in preconfigured arrangements. Sets of four bearings arranged in tandem need to be mounted against a single bearing, or a set of bearings in tandem, to achieve the desired preload. All the other arrangements are available in different preload classes and correct mounting results in preload within a predetermined range, without the need for shims or similar devices. The bore and outside diameters of the bearings are matched to within a maximum of one-third of the permitted diameter tolerance, to provide better load distribution than single universally matchable bearings. Very high running accuracy High axial and radial stiffness High axial and radial load carrying capacity Non-contact seals Integral sealing prolongs bearing service life

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Product Introduction

Dimensions - S71930 CD/P4AQBCD

Dimensions

d	150 mm	Bore diameter
D	210 mm	Outside diameter
B	112 mm	Width
d₁	168.5 mm	Shoulder diameter of inner ring (large side face)
D₄	201.85 mm	Recess diameter outer ring shoulder (small side face)
r_1,2	min.2 mm	Chamfer dimension
r_3,4	min.1 mm	Chamfer dimension

Abutment dimensions - S71930 CD/P4AQBCD

Abutment dimensions

d_a	min.159 mm	Diameter of shaft abutment
d_a	max.167.7 mm	Diameter of shaft abutment
D_b	max.205 mm	Diameter of housing abutment
r_a	max.2 mm	Radius of fillet
r_b	max.1 mm	Radius of fillet

Calculation data

Basic dynamic load rating	C	302 kN
Basic static load rating	C₀	520 kN
Fatigue load limit	P_u	16.6 kN
Attainable speed for grease lubrication		To be calculated: Single bearing (6300) x speed reduction factor (see table below)
Attainable speed for oil-air lubrication		To be calculated: Single bearing () x speed reduction factor (see table below)
Contact angle	α	15 °
Ball diameter	D_w	19.05 mm
Number of rows	i	4
Number of balls (per bearing)	z	23

Preload and stiffness (back-to-back, face-to-face)
Preload class		D
Preload	G	7 520 N
Axial stiffness		810 N/µm

Correction factors for preload calculation
Correction factor dependent on bearing series and size	f	1.24
Correction factor dependent on contact angle	f₁	1
Correction factor, preload class D	f_2D	1.15
Correction factor for hybrid bearings	f_HC	1

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.

Applications of Precision Contact Bearings

Precision contact bearings are widely applied in a variety of industries due to their exceptional performance characteristics. In the automotive sector, they are crucial for the smooth operation of engines, transmissions, and suspension systems, ensuring reliability and fuel efficiency. Aerospace applications utilize these bearings for their ability to withstand extreme conditions and high speeds, contributing to the safety and efficiency of aircraft. Industrial machinery, such as CNC machines and robotics, benefit from the high precision and durability of these bearings, enabling consistent and accurate operations. Medical devices, which demand minimal noise and vibration, also rely on precision contact bearings to ensure patient comfort and device effectiveness. Overall, the versatility and reliability of precision contact bearings make them essential in numerous high-precision and high-performance applications across different sectors.

NO.	d[mm]	D[mm]	B[mm]
S71930 CD/P4A	150	210	28
S71930 ACDGA/P4A	150	210	28
S71930 ACDGA/HCP4A	150	210	28
S71930 ACD/P4ADBB	150	210	56
S71930 ACD/P4A	150	210	28
S71930 ACD/HCPA9AQGA	150	210	112
S71930 ACD/HCP4ATGA	150	210	84
S7028 CD/P4ATBTA	140	210	99
S7028 CD/P4AQBCC	140	210	132
S7028 CD/P4AQBCA	140	210	132
S7028 CD/P4A	140	210	33
S7028 ACDGA/P4A	140	210	33
S7028 ACD/P4ATBTA	140	210	99
S7028 ACD/P4ADGC	140	210	66
S7028 ACD/P4ADGA	140	210	66
S7028 ACD/P4A	140	210	33
71930 CDGC/P4A	150	210	28
71930 CDGA/P4A	150	210	28
71930 CDGA/HCP4A	150	210	28
71930 CD/P4ATBTA	150	210	84
71930 CD/P4ADGC	150	210	56
71930 CD/P4ADGB	150	210	56
71930 CD/P4ADGA	150	210	56
71930 CD/P4ADBA	150	210	56
71930 CD/P4A	150	210	28
71930 CD/HCP4A	150	210	28
71930 ACDGC/P4A	150	210	28
71930 ACDGC/HCP4A	150	210	28
71930 ACDGA/P4A	150	210	28
71930 ACDGA/HCP4A	150	210	28

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