B7244-C-T-P4S-UL Bearing

 

d	220 mm	Bore diameter
D	400 mm	Outside diameter
B	65 mm	Width
Cr	405,000 N	Basic dynamic load rating, radial
C0r	400,000 N	Basic static load rating, radial
Cur	23,900 N	Fatigue load limit, radial
nG Grease	2,800 1/min	Limiting speed for grease lubrication
nG Oil	4,300 1/min	Limiting speed for oil lubrication
≈m	33.1 kg	Weight

da	264 mm	Diameter shaft shoulder
da	h12	Diameter shaft shoulder clearance
Da	356 mm	Shoulder diameter outer ring
Da	H12	Shoulder diameter outer ring clearance
ra max	3 mm	Maximum recess radius
ra1 max	3 mm	Maximum recess radius
Etk min	282.3 mm	Minimum diameter injection pitch
Etk max	298.2 mm	Maximum diameter injection pitch
Etk1 min	282.3 mm	Minimum diameter injection pitch
Etk1 max	298.2 mm	Maximum diameter injection pitch
a	74 mm	Distance between the apexes of the pressure cones

rmin	4 mm	Minimum chamfer dimension
r1 min	4 mm	Minimum chamfer dimension
α	15 °	Contact angle

Tmin	-30 °C	Operating temperature min.
Tmax	100 °C	Operating temperature max.

FV L	2,387 N	Preload force light
FV M	7,527 N	Preload force medium
FV H	15,105 N	Preload force heavy
KaE L	7,238 N	Lift-off force light
KaE M	24,345 N	Lift-off force medium
KaE H	51,776 N	Lift-off force heavy
ca L	224 N/µm	Axial rigidity light
ca M	368 N/µm	Axial rigidity medium
ca H	515 N/µm	Axial rigidity heavy

 

The B7244-C-T-P4S-UL is a high-precision angular contact ball bearing meticulously engineered for spindle applications, particularly within machine tools and other demanding environments requiring exceptional rotational accuracy and speed. This specific designation encapsulates a wealth of information regarding its features. "B7244" identifies the bearing's dimensional series, indicating its size and load-carrying capacity. The "C" typically signifies a contact angle, optimized for handling combined radial and axial loads prevalent in spindle operations. "T" often denotes a specific cage type, frequently made from robust materials like phenolic resin or reinforced polyamide to withstand high speeds and demanding accelerations. Finally, "P4S" and "UL" are crucial precision and preload indicators. "P4S" points to a high level of dimensional and running accuracy, adhering to stringent ISO or ABEC standards for precision bearings, while "UL" signifies an Ultra-Light preload. This combination of meticulously chosen features ensures the bearing operates with minimal friction, heat generation, and vibration, crucial for maintaining machining precision and extending bearing life.

The advantages of utilizing a B7244-C-T-P4S-UL spindle bearing are directly linked to its precise design and high-quality manufacturing. The P4S precision class translates to superior rotational accuracy, enabling machine tools to achieve tighter tolerances and finer surface finishes on workpieces. The angular contact design, coupled with the specific contact angle and cage, allows for efficient handling of combined loads and high-speed operation. The Ultra-Light preload ("UL") is particularly beneficial for high-speed spindles as it minimizes starting and running torque, reducing heat build-up and energy consumption. This lower operating temperature not only extends the grease life and bearing lifespan but also contributes to improved dimensional stability within the spindle assembly, further enhancing machining accuracy. In essence, this bearing is designed to maximize spindle performance, leading to increased productivity, improved part quality, and reduced maintenance downtime.

The applications for the B7244-C-T-P4S-UL spindle bearing are primarily centered around high-precision rotating machinery, with a strong focus on machine tool spindles. These bearings are commonly found in CNC machining centers, milling machines, lathes, grinding machines, and boring machines, where spindle performance directly impacts the accuracy and surface finish of the final product. Beyond machine tools, their high-speed and precision capabilities make them suitable for other demanding applications such as high-speed routers used in woodworking and composite material processing, balancing machines, and specialized high-speed test equipment. Any application demanding exceptional rotational accuracy, high speed capability, and reliable performance under demanding load conditions within a compact footprint is a potential candidate for the B7244-C-T-P4S-UL spindle bearing, highlighting its versatility in precision engineering.

 

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