Leyland's S-cam
Page 16
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AN ADVANCED design of S-cam brake from Leyland Trucks will have its first showing at the Institute of Road Transport Engineers conference in May.
The Roller cam, manufactured at the Albion works in Glasgow will be introduced progressively on to Freighter, Cruiser and Constructor models from May.
The new design allows for quick dismantling of the brakes without the need for tools and with the hub in position. It is also aimed at improving reliability, particularly for off-road vehicles.
Twin webbed shoes, fabricated from high grades steel Incorporate a shoe retention system which has a 0-shaped fulcrum pin and an eye-end having an angle of wrap greater than 180 degrees.
When the shoe is hooked over the flattened part of the pin, a clearance fit is achieved. The fulcrum pin remains fixed in the carrier while the shoe rotates on the circular position of the 0shaped pin.
Rollers, located in the twin webs using pins with flattened ends, run on an S-cam which allows them to follow an involute path. Tapered linings are from Don 242 organic material.
Lubrication of the camshaft is provided independently to both scrolled bearings. 0-rings and seals provide positive sealing while the thrust washer is vented to give visible relief when greasing. The system will accept automatic lubrication if required.