Hydro-pneumatic Tandem Axle• Suspension
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A SUSPENSION system for tandem in. rear axles forms the subject of patent No. 857,554. It is claimed that the system will permit a ratio of laden to unladen rear axle loading of 10: 1. (Eaton Axles, Ltd., Victoria Works, Great Sankey, Warrington.)
In the drawing, the tandem axles (1 and 2) are carried on links (3). Vertical deflection of the axles is permitted by a parallel linkage (4), pivoted to the frame at points 5 and 6. Rise and fall of the axles moves cranks (7) which compress or extend reaction units (8).
The reaction units consist of combined hydraulic and pneumatic cylinders which act both as springs arid as height adjusters. The supply or release of hydraulic fluid is controlled by a pistonvalve set to maintain a constant height. The compressed air provides the spring action.
The patent gives full details of the internal layout of both the reaction units and the height control valve.
The cam-ring is displaced to advanc4 or retard the injection timing by a spheri cal stub (3) held between a spring plunge (4) and a hydraulic piston (5).
The hydraulic piston is operated b3
fuel by-passed . from the injectiot plungers; when this is large in quantit3 the timing is advanced. Higher speed: and heavy loads reduce the spill so tha the piston moves towards the retard posi tion. The greatest retard is given at loll speed with heavy load.
' TRAILER BRAKING
A VACUUM-ACTUATED tractor 1-1 trailer brake is shown in patent No 857,252. The subject of the patent is thi arrangement of the valve mechanism an the automatic break-away control. Th( patent comes from The Bendix Corp. South Bend, Indiana, U.S.A.
ROCKING BEAM SUSPENSION IMPROVEMENTS in the suspension o 'four-wheeled bogies mounted on rock jug beams are disclosed in patent No 857,440. hi particular, it deals with thi bearing on which the axles pivot, aiminl at preventing seizure. (Hendricksot Mfg. Company, 8001 West 47th Street Lyons, Illinois, U.S.A.)