Newton Recoil Damper Improved
Page 73
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Constructional Features of an Interesting Hydraulic Device which is Finding Favour in the Commercial Vehicle Field
IN our issue dated October 1st, 1929, we described the construction and action of the hydraulic recoil damper invented by Mr. Noel Newton and marketed by Newton and Bennett, Ltd.,.of Valetta Road, London, W.3, and of Manchester. The company is now devoting increasing attention to the commercial-vehicle field, which offers a definite demand for a good, simple device for preventing spring bounce, and some modification of .design in the Newton device has recently
been made. .
In the latest model the cylinder forms the upper part whilst the piston and rod; with the dust cover, form the lower part, and are fixed to the axle. • An improved action is obtained, the principle, however, being
virtually unaltered. •
When the axle suddenly rises the piston moves upward in the cylinder, thefluid flowing downward through it by way of a plate valve, which is thrust from its Seating. The displacement caused by. the entering piston rod is provided for by an upper plate valve, through which a limited flow of liquid passes into an Upper displacement chamber, therein compressing air. On the recoil stroke the liquid beneath the piston has to pass through holes in the rod, uncovered by a sliding valve, the result of which is that, the greater the lift the easier is the return flow. This means a very nice gradation in the recoil movement. In the course of the return stroke liquid front the displacement chamber re-enters the main cylinder as the piston rod withdraws. The cylinder • is thus always maintained full of liquid and any loss of liquid'is .automatic
ally replaced. •
In the newest models a fillity, plug is provided at the .top, which may be replenished every 5,000 miles or 6,000 miles, a levet plug at the side indicating the amount required. The device is' adjusted by the manufaetrErer and should never need alteration, although this is easily. 'made on dismantling.
• • Mr. 'Noel Newton' tells 'us that several commerciahnotor mannfacturers are testing his new retell damper and some are fitting it; Readersr will recall that it was shown on the Gilford AS6 chassis described in our issue dated July 29th, also on the Commer Invader chassis dealt with in last week's issue.