Jaw Couplings for Automation & Linear Motion
Ruland zero-backlash jaw couplings consist of two lightweight aluminum hubs and a center elastomeric element called the spider. Hubs are machined with a proprietary machining process to produce a curved jaw profile that press fits with the spider to achieve consistent zero-backlash operation. The spider dampens impulse loads, minimizing shock to the motor and other sensitive system components such as bearings. This is particularly useful in linear systems with high acceleration/deceleration curves often found in optical inspection and measurement equipment. The spider is available in three durometers allowing the designer to balance dampening capabilities with torque, misalignment and torsional stiffness based on system requirements.
Zero-backlash jaw couplings are considered fail safe because the spider serves as the wear element – if it fails the jaws of the two hubs interlock for direct power transmission. This allows for the application to be safely shut down for maintenance rather than stopping suddenly. Spiders can be replaced to restore the original performance characteristics of the coupling leading to reduced maintenance costs when compared to other coupling styles that require complete replacement at the end of their usable life. Bores are available in sizes from 1/8” to 1-1/4” and 3mm to 32mm. The three piece design allows the user to mix and match clamp or set screw hubs with inch, metric, or keyless bores making it easier to tailor the coupling to specific system requirements.
