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Tsubaki Power-Lock®

Power-Lock is a friction locking device also known as keyless shaft bushing or keyless locking device by other manufacturers.

Power-Lock Parts

Fig.1 shows a simple AS Series Power-Lock from Tsubaki

Let's look at how Power-Lock performs better compared to keyed joints!

The concept of how it works is linked with the name of the device. It uses friction to transmit torque between the shaft and bore surfaces.

Power-Lock Concept

Above Fig.2 shows the concept of Tsubaki Power-Lock

Looking at Fig,2 it shows the pressure exerted onto both surfaces labeled P' and P. Note that P' refers to the force acting on the outer ring and P refers to the force acting on the inner ring in Fig.1. When the both outer and inner rings extends and the locking bolts torqued to the required torque, it forms a secure connection between the hub and the shaft with the force spread evenly around unlike the traditional keyway where most of the force transmitted is only through the small surface area of the key.

Watch the video to better understand the components of a Power-Lock, assembling and disassembling and installation guide of our very own friction locking device!

Now lets get to the advantages and disadvantages of using Power-Lock!

Advantages includes:
  • No keys required
  • Provides simple and highly secure connections without backlash
  • Wide range of models for different applications
  • High transmissible torque ratings
  • Self-Centering
  • Easy installation and removal
  • Durable & Reusable
  • Higher initial cost
  • Conversion from keyed joints can be difficult

To sum it up, the advantages that a Power-Lock has almost definitely out-weighted the disadvantage of using one, so there's no reason to go back to using traditional keyed joints! Should you have any questions about our Power-Lock®, please feel free to contact us and we will be glad to assist you!