1014 Rubber spring suspension

10.14.1 Rubber springs mounted on balance beam with stabilizing torque rods (Fig. 10.103) Suspension rubber springs are made from alternatively bonded layers of rubber blocks and steel reinforcement plates sandwiched between inclined mounting plates so that the rubber is subjected to a combination of both shear and compressive forces. The rubber springs are mounted between the chassis spring cradle and a centrally pivoted wedge-shaped load transfer member (Fig. 10.103). The load between the two axles is equalized by a box-sectioned balance beam which is centrally mounted by a pivot to the load transfer member. To eliminate brake torque reaction, upper 'A'

Articulating beam Rubber spring Load transfer member

Articulating beam Rubber spring Load transfer member

Fig. 10.103 Rubber spring mounted on balance beam with leading and trailing torque arms

brackets or torque arms are linked between the axles and chassis. With a pair of inclined rubber springs positioned on both sides of the chassis, loading of the axles produces a progressive rising spring rate due to the stress imposed into the rubber, changing from shear to compression as the laden weight rises.

The axles are permitted to articulate to take up any variation in road surface unevenness independently of the amount the laden weight of the vehicle has caused the rubber springs to deflect.

All pivot joints are rubber bushed to eliminate lubrication.

These rubber spring suspensions can operate with a large amount of axle articulation and are suitable for non-drive tandem trailers, rigid trucks with tandem drive axles and bulk carrier tankers.

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