Three-way joints are rigid alternative
A
Heason Technology product story
Edited by the Engineeringtalk editorial team
Mar 3, 2008
Providing backlash-free axial rigidity but allowing radial and angular freedom of movement, the SRJ range offers a very compact alternative to combining traditional roller bearings.
Heason's new line of spherical rolling joints from Japanese manufacturer Hephaist Seiko offer a novel approach to axial alignment of parallel kinematics and high precision positioning mechanism such as Hexapods and Stewart Platforms.
Providing backlash-free axial rigidity but allowing radial and angular freedom of movement, the SRJ range offers a very compact alternative to combining traditional roller bearings to achieve 3-degree-of-freedom joints - with significantly increased rigidity.
The design includes an SUJ2 steel mounting base with a precision ground sun sphere connected, via a very low friction ball cage retainer, to a planetary sphere which has a threaded shaft for mounting to a parallel joint or actuator mechanism.
The maximum swing angle is +/-30 degrees, and in the radial plane complete freedom of movement is allowed.
On request, alternative materials can include stainless steel and the SRJ can be supplied with vacuum-compatible grease.
The range covers base diameters from 19 to 136mm in eight sizes with threaded connecting shafts from M3 to M28.
Axial load ratings are up to 10.6kN in the push (compression) direction and 16kN in the pull (tension) direction.
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