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Mastiff/Norde 32-ton tractive unit
Page 33
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• Converted by the North Derbyshire Engineering Co Ltd, the first of four BMC Mastiff/Norde 32-ton tractive unit chassis left the workshops of the company in Darley Dale last week for delivery to the operators. James Hemphill Ltd, Glasgow.
Equipped with a Primrose 6-ton single-tyred third axle of the self-steering trailing type ahead of a repositioned driving aide, the units have axle loadings in tons of 5-5-10 front to rear, and the two rear axles are based on Norde rubber suspension which gives a maximum deflection of liin. The units will be employed for collection and delivery of 3011, demountable ISO tankers from Freightliner terminals within a 50-mile radius, the tanks being mounted on skeletal trailers, and for medium-distance operations coupled to conventional tanker/trailers in a radius of 150 miles. CM visited Darley Dale on Friday to see the unit and to travel a short distance in the vehicle as a passenger to observe the action of the axle on winding roads..
A spokesman of the James Hemphill company told CM that Norde suspension was specified, because it cuts out hopping and promotes stability and reduces tyre wear. And the use of a Primrose trailing axle eliminates the need for power steering (by cutting out tyre scrub on corners) and should give improved tyre wear compared with a fixed axle. An air-operated plunger can be used to lock the Primrose axle in the forward position, the control knob being located on the right of the driver's seat. The brakes are applied by single diaphragm air actuators.
Repositioning the driving axle farther to the rear has increased the outer axle spread from 114in. to 1531in., the distance between the axle centres from the bogie being 48in. An intermediate support bearing and universal joint is incorporated in the lengthened propellor shaft.
Attached to the chassis frame in the normal way, the Norde suspension is modified to divide the loading between the driven and trailing axles in the ratio of 2 to 1 by providing an effective radius arm length of 16in. on the driving axle side of the fulcrum point and 32in. on the trailing axle side. Of the standard Norde type the suspension is based on Metalastik rubber sandwiches that are stressed in sheer and compression and are fully progressive. The oscillating beam on each side is centrally pivoted on a bracket bonded to the two sandwiches, and the axles are mounted on members linked to the beams at the lower end and to radius arms at the upper end.