Catalog - page 4

ULTIMATE RADIAL STATIC
LOAD CAPACITY ROD ENDS
The ultimate radial static load capacity is based upon
the minimum mechanical properties of the design
configuration in the stressed area. The ultimate
radial static load capacity called out in the rod end
specification charts is defined as a single cycle,
unidirectional applied load to cause ultimate failure.
Operating loads should be based on the static load
ratings, incorporating appropriate safety factors to suit
the application. When a rod end is to be applied in
full rotation, the surface speed of the ball should be
kept below 20 feet per minute or the rotational speed
should be below 100 RPM, whichever is lower, with
the operating loads not to exceed 10% of the ultimate
radial static load.
Load ratings listed in the standard detail pages are
applicable to rod ends supplied without grease fittings.
Load ratings for units employing fittings may be affected
due to lighter cross section in the stressed area.
For information on the rod end radial static
load ratings with fittings and other specific load
rating information, consult the Aurora Bearing
engineering department.
AXIAL STATIC
LOAD CAPACITY ROD ENDS
Axial static load capacity is the force that is applied
through the bore of the ball. For Aurora two-piece
rod ends, maximum axial static load capacity is
recommended to be 15 percent of the ultimate radial
static load capacity. For three-piece rod ends,
maximum axial static load capacity is generally
recommended as 10 percent of ultimate radial static
load capacity. It should be noted, however, that on
three-piece units factors such as race material, body
material and dimensions may affect axial static load
capacity. For further information, consult the Aurora
Bearing engineering department.
RADIAL STATIC LIMIT LOAD
CAPACITY SPHERICAL BEARINGS
Radial static limit loads are maximum static based on
the maximum permanent set in the bearing race of
0.2% of the ball diameter. If greater permanent set
can be allowed or if alternate race materials are used
consult our engineering department for change factors.
Operating loads are based on the radial static limit load
rating and appropriate safety factors should be utilized
to suit the application.
Max axial load is recommended at 20 percent of the
radial static load. Extreme care should be used on
selecting a sufficiently strong housing to accept this
type of bearing.
BEARING MISALIGNMENT
A rod end or spherical bearing’s ability to misalign
is measured by the degree of angle the ball can
accommodate without interference.
The angle of misalignment in a rod end is limited by
the ball width and head diameter as shown in figure
1. This arrangement is called a clevis mount, and is
the type represented in the standard rod end detail
pages. If added misalignment is necessary, this can
be accomplished by utilizing spacers between the
clevis mounting and ball face, or by using special rod
ends designed to meet specific requirements.
Misalignment angle in a spherical bearing is limited
by the ball and race width with respect to the ball
diameter, illustrated in figure 3. This is the mounting
type represented in the standard detail pages for
spherical bearings.
Mounting arrangements for spherical bearings such as
shown in figures 2 through 4 are also used with rod
ends. The misalignment angle is then calculated by
selecting the proper formula below.
ANGLE OF MISALIGNMENT
a
1
a
1
FIGURE 1
FIGURE 3
FIGURE 2
a
1 = Sin
-
1 W
-
Sin
-
1 H
a
2 = Sin
-
1 W
-
Sin
-
1 H
FIGURE 4
a
3 = Sin
-
1 W
-
Sin
-
1 H
a
2
a
2
a
3
a
3
a
4
a
4
Reference Letters
B - Ball Bore
M - Outer Race Chamfer
D - Head Diameter of Outer Race Diameter
R - Ball Diameter
H - Housing Width
A - (D-2M)
2
+ H
2
W - Ball Width
D
D
A
A
R
R
a
4 = Cos
-
1 B
-
Sin
-
1 H
R
R
Fax 630-859-0971
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