parts.bearing.deepgroove
parts: B = parts.bearing.deepgroove ('data')
parts: B = parts.bearing.deepgroove ('data', DESIGNATION)
parts: S = parts.bearing.deepgroove ('solid', DESIGNATION)
Single row deep groove ball bearings from the catalogue.
B = parts.bearing.deepgroove ( returns every
bearing in the catalogue as a table, one row per bearing, sorted by bore,
then outside diameter, then width.
'data')B = parts.bearing.deepgroove ( returns the one bearing named, such as 'data',
DESIGNATION)'6205'
or '61930 MA'. Nothing is built.
S = parts.bearing.deepgroove ( builds the bearing as a 'solid',
DESIGNATION)solid.Shape, its axis
on the z axis, one face on the xy plane and the other at
z = B: the inner and the outer ring, each with its
raceway, and the balls between them, each a solid of its own; the cage
is left out. The catalogue gives no internal geometry, so the shape
takes the proportions of the type: balls
of diameter Dw = min (0.3*(D - d), 0.8*B) on the pitch circle
(d + D)/2, as many as fill 60 per cent of it; each ring stops
0.3*Dw short of the pitch circle, with a groove of radius
0.52*Dw, so that the balls run free; the outer corners of the
rings are rounded to r. It shows the bearing; it does not stand
for the maker’s internal design.
The table has these variables, each with its unit and its description,
which summary (B) lists; lengths are in millimetres, loads
in newtons:
designation | the designation, as SKF prints it |
d | bore diameter |
D | outside diameter |
B | width |
r | smallest chamfer of the rings, r_{1,2} min |
da | smallest diameter of a shaft shoulder, d_a min |
Da | largest diameter of a housing shoulder, D_a max |
ra | largest fillet radius at a shoulder, r_a max |
C | basic dynamic load rating |
C0 | basic static load rating |
nlim | limiting speed, revolutions per minute |
mass | mass, in kilograms |
source | the catalogue page the values were read from |
The open bearings of the series 618, 619, 60 and 62, bores 4 to 380 mm,
transcribed from the product tables of the SKF catalogue Rolling
bearings (PUB BU/P1 17000 EN), section 1.1, pages 260 to 302. Where
SKF lists a bearing only with a brass cage, such as '61930 MA',
that is the one given. The boundary dimensions follow ISO 15 and hold for
any maker; the load ratings and the speed are SKF’s, and another maker’s
differ.
See also: parts.screw.cap, parts.dowel, parts.key
Source Code: parts.bearing.deepgroove