SKF - Linear Motion Standard Range

3 Ball & roller screws
Roller screws
Ultra Power range
The SKF Ultra Power range (figs. 26 and
27) is designed for heavy loads and long
service life.
Fig. 26
High load capacity
A SKF Ultra Power range of planetary
roller screws has been optimized to
provide a capacity increase up to 60% over
the standard roller screw with the same
combination of diameter and lead, and, in
addition, to reach the maximum possible
service life within a compact space.
The maximum load should not be applied
on the mounting bolts but on the flange.
For each screw size, the roller screw
catalogue will display two different values
for the dynamic load carrying capacity
(Ca) according to the maximum load being
applied. The catalogue also specifies a
reference load F a :
• The higher C a value is valid for maximum
application load ≤ F a
• The lower C a value is valid for maximum
application loads > F a and up to 80% of
the lower C a value (except for diameter
60, where maximum application loads
should not exceed 50% of the lower C a
value)
Example
HRP 120 x 20
• Plastic injection application (F ≤ F a )
- F max = 320 kN
- C a = 1 550 kN
• Heavy press application (F > F a )
- F max = 954 kN
- C a = 1 192 kN
Short strokes/oscillation performance
The kinematics of all SKF planetary roller
screws provides continuous rolling of the
working elements without recirculation.
They are highly reliable in high load
applications with short strokes and rapid
changes of direction.
Designation
HRC: cylindrical nut
HRP: nut with off-centered flange
HRF: nut with centered flange
170