Newton Suspension Controller Easily Serviced
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New Unit, Which is Interchangeable With Existing Newton Equipment, Can be Topped-up in a Few Minutes
SUSPENSION control devices, in which a liquid is used as the damping medium, are often neglected in the matter of maintenance. The result is a gradual falling off in efficiency until the unit itself calls for extensive reconditioning.
In the Newton hydraulic suspension control unit, the question of easy and convenient servicing has been a prime consideration, and although it is practically leakproof, examination and replenishment, if necessary, take only a few minutes.
The present type, the serial number of which is 8,200, is interchangeable with the original C.2 unit, so that operators of Leyland and A.E.C. buses and coaches on which Newton equipment is installed, can readily make the change-over.
In the accompanying drawing are shown the details of construction, and it will he seen that the gland is sealed to the outer cylinder by a synthetic ring, a similar seal between the piston rod and the bore of the gland preventing the ingress of abrasive matter. Fluid which may pass the gland, drains back to the reserve chamber via leak-off ports.
The principle of operation is that, on the bump or compression stroke, a volume of fluid, equal to the area of the piston rod entering the working chamber, is displaced through a ported piston valve to an annular space between the inner and outer cylinders. The xernaining fluid lifts a lightly loaded plate valve, and passes to The upper side of the piston bead.
On rebound, •the fluid passes from spring-loaded valves to the underside of the head. At the same time, the volume of fluid displaced to the outer cylinder on compression is drawn into the working cylinder through a plate valve.
In order to avoid erratic working, it is, of course, essential ehat recuperation of displaced fluid is positively achieved, and this is asi-ured by large-area ports and an unrestricted flow past a piston plate. The working valves, in each case, are of the ported piston type, which are stable and free from flutter.
An interesting feature of Newton units is that they are individually tested under conditions approximating to those experienced in service.
The maker is Newton and Bennett, Ltd., Valetta Road, London, W.3.