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Clutch Operation by Air
Page 86
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MEW drum brakes, a fully automatic clutch system, an air-servo braking unit and a fuel-water separator are to be exhibited by the Automotive Products Co., Ltd., and their associated companies at the Commercial Motor Show.
Providing fully automatic clutch operation when a vehicle is starting from rest, the Autoclutch system is an addition to the range of units produced by Borg and Beck Co., Ltd. The system is used with the standard clutch in vehicles having synchromesh gearboxes.
Connected to the clutch operating lever, a diaphragm-type servo is worked by compressed air or vacuum and is con trolled by two valves. One is actuated by a belt-driven governor and the other by the gear lever. The governor valve gives automatic engagement when starting. whilst the gear-lever valve is operated during gear-changing.
An auxiliary control unit is incorporated in the system to ensure that clutch operation is smooth and progressive. This comprises a series of closely grouped valves, which prevent harsh application of the operating medium.
A safety device is fitted which obviates disengagement of the clutch when the e28 vehicle is parked, so that the engine acis as a brake if a gear is engaged.
Produced by the Lockheed Hydraulic Brake Co., Ltd., a new air-servo braking unit is known as the Air Pak. It caters for gross vehicle weights of up to 24 tons and is similar both in design and output to the Lockheed Hydrovac. The Air Pak is integral with an auxiliary reservoir, which has sufficient capacity for emergency conditions and eliminates the necessity of a separate container.
Air is fed to the operating side of the power piston from a compressor that can also supply other air-actuated equipment. Designed to facilitate integral mounting with the unloader valve, the unit also provides for pipe connection to the valve.
Novel drum brakes to be shown by the company include a 13-in. by 3-in, front brake and a 13-in. by 24-in, rear brake. The front brake is of the two-leadingshoe type and normal lining thickness is Linings of On. thickness are available for arduous work. Basically similar to established types in the Lockheed range, the rear brake is worked by a transverse cylinder which incorporates the operating mechanism for the hand brake.
Particularly suited to arduous conditions overseas, a new Purolator fuel water separator has been produced by Automotive Products Co., Ltd. It is designed to combat heavy moisture condensation in vehicle fuel tanks. The filter will extract water droplets and emulsified water to within five parts in one million.
The unit to be displayed at Earls Court has a capacity of 50 g.p.h. Smaller models with capacities from 5 g.p.h. will be available in the near future,