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Hephaist Spherical Rolling Joints
Date: 20 November 2007
Rolling Guide with Zero Clearance has Realised High Rigidity and High Precision
Joints with multiple degrees of freedom
essential to parallel mechanism have conventionally been 2-3
degrees of freedom by combining rotational joints. However, use of
these joints have been characterised by increasing the size due to
complex structure. Sliding spherical joints with multiple degrees
of freedom have also been available, although they have had large
frictional resistance and inner clearance. In order to resolve
these problems, the Spherical Rolling Joints have been developed.
These units provide high precision and rigidity for zero clearance
three degree of freedom rolling guideways. Joints are available
worldwide from Heason Technology Ltd., UK distributor and global
sales office.
The spherical rolling joints (SRJ) are available in eight sizes and
two precision grades. Standard precision grade has a run-out less
than +/-2 micron. Super precision class have a run-out less than
+/-1 micron. The smallest SRJ has a 6.35mm diameter sphere in a
housing of just 19mm diameter with a load capacity of 128N through
to the largest SRJ with a 76.2mm diameter sphere in a 136mm
diameter with a load capacity of 16KN. Maximum swing angles are up
to 40 degrees.
High Precision
The movable part has less frictional resistance due to its rolling
joint structure under preload, achieving high precision with zero
clearance.
Downsizing of Joints with Multiple Degrees of
Freedom
Compared with those combining rolling
bearings with 3 degrees of freedom, higher rigidity and small
sizing has been achieved.
Application to Parallel Mechanism
Optimal for
achieving high precision, high rigidity and small size in parallel
mechanisms.
Superfine Inner Spherical Machining
Technology
Realised with superfine inner spherical machining technology.
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