Solution promises big advantages for machine builders

Surrey-based power transmission experts jbj Techniques has published a new section on its website that is packed full of details on its SIT-LOCK Keyless range of shaft locking elements.

According to jbj Techniques, these devices offer machine designers and builders a unique combination of advantages that are said to include:

Easy assembly and disassembly

Both actions take place by locking and unlocking the clamping screws with ordinary, common tools. The use of a torque wrench is only necessary when a more precise torque is required.

Superior holding power

The action of the clamping cones creates a shaft clamping torque, which, states the company, “is demonstrably superior to a normal keyed hub”.

Overload protection

When the pre-set torque level is exceeded, SIT-LOCK will slip, preventing the connected elements from being broken. The company points out that SIT-LOCK units are not friction couplings, so the presence of excessive slip may cause damage.

Easy adjustment

Combining the SIT-LOCK design of smooth cone action with superior holding power, the hub can be clamped at any position along a shaft, eliminating the need for additional components, such as lock washers, spacers, stop rings etc.

Precision location

With the SIT-LOCK smooth cone action, jbj’s solution is said to be well suited  for clamping cams, timing devices and indexing mechanisms, with accuracy and precision across a wide variety of operating temperatures, ranging from -20°Celsius to +150°Celsius.

SIT-LOCK units from jbj Techniques are, it says, suitable for connecting any type of hub (for example, flywheels, chain-wheels, gears, levers, pulleys, eccentrics, couplings). jbj keeps 10 types in stock for immediate despatch to cater for a varied range of applications.

“Machine builders and designers don’t need reminding about the critical nature of a shaft-to-hub lock, given that an unsuitable choice could cause serious damage to the machine [or system] with potentially costly results,” the company concludes.