238/670 CAMA/W20- Spherical roller bearings-FGFA bearings

238/670 CAMA/W20 Spherical roller bearing

Self-aligning roller bearings are heavy-duty transmission components featuring automatic self-alignment. Their core comprises an inner ring, outer ring, barrel-shaped rollers, and a cage. They offer high load-carrying capacity, capable of simultaneously withstanding substantial radial loads and minor axial loads. These bearings exhibit excellent impact resistance, stable operation, and suitability for medium-to-low speed, heavy-load applications. They demonstrate low wear and extended service life.

Dimensions

d	670 mm	Bore diameter
t_Δdmp	-0.075 – 0.0 mm	Deviation limits of mid-range bore diameter
D	820 mm	Outside diameter
t_ΔDmp	-0.1 – 0.0 mm	Deviation limits of mid-range outside diameter
B	112 mm	Width
t_ΔBs	-0.75 – 0.0 mm	Deviation limits of ring width
d₂	≈724 mm	Shoulder diameter of inner ring
D₁	≈778 mm	Shoulder/recess diameter of outer ring
K	9 mm	Diameter of lubrication hole
r_1,2	min.4 mm	Chamfer dimension
	Normal	ISO tolerance class for dimensions

Abutment dimensions

d_a	min.685 mm	Diameter of shaft abutment
D_a	max.805 mm	Diameter of housing abutment
r_a	max.3 mm	Radius of fillet

Calculation data

FGFA performance class		FGFA Explorer
Basic dynamic load rating	C	2 643 kN
Basic static load rating	C₀	6 400 kN
Fatigue load limit	P_u	430 kN
Reference speed		400 r/min
Limiting speed		700 r/min
Limiting value	e	0.11
Calculation factor	Y₁	6.1
Calculation factor	Y₂	9.1
Calculation factor	Y₀	6.3

Tolerances of run-out

Range of section height at inner ring of assembled bearing	t_Kia	80 µm
Range of section height at outer ring of assembled bearing	t_Kea	140 µm
ISO tolerance class for geoal tolerances		Normal

Radial internal clearance

Minimum initial clearance	350 µm
Maximum initial clearance	530 µm

Tolerances: Normal, P6, P5,
tapered bore 1:12, tapered bore 1:30
Radial internal clearance: cylindrical bore, tapered bore

Basic Parameters

Bearing Inner Diameter：670 mm
Bearing Outer Diameter：820 mm
Bearing Thickness：112 mm

Wafangdian Fafuge Bearing Co., Ltd., rooted in Wafangdian Bearing Industry Base, is an emerging professional bearing manufacturer. Drawing on the base’s profound industrial heritage, we have upheld craftsmanship since inception, integrated precision manufacturing into R&D and production, and focused on the R&D and refined production of spherical roller bearings.