When developing its next generation of three-wheel trucks, Yale Lift Trucks tasked Warner Electric with customising the PK-35 brake to fit in a confined space whilst providing parking and manual release braking functions.
The brake locks the traction motor shaft when the truck is parked – with springs pushing against a moving armature, which clamps a friction disc linked to the motor shaft. When power is applied to the brake, a coil acts as an electromagnet to pull the moving armature and to compress the springs. There are two motors, back-to-back, each linked to the front wheels of the truck – the brakes are mounted on the back of the traction motors, on the opposite side to the gearbox. They incorporate a manual override function that allows for easy vehicle towing in case the truck needs to be moved, with no need for additional tools or power sources.