Bristol HG Lorry

Manufacturer	Bristol Commercial Vehicles
Production	1952 to 1956
Class	Commercial vehicle
Body style	truck/lorry
Engine	9.8 liter
Transmission	5-speed manual
Lenght	29ft 10in

The Bristol HG was a truck produced by British manufacturer Bristol Commercial Vehicles in the 1950s for BRS . The designation HG stands for Heavy Goods 

History

The vehicle was built exclusively for the state-owned British Road Services (BRS). Bristol Commercial had come under the control of the British Transport Commission as part of the nationalization of the British transport industry and from 1965 a subsidiary of the holding company Transport Holding Company , which had emerged from the British Transport Commission . Bristol Commercial was only allowed to sell vehicles and chassis to other parts of the British Transport Commission or other subsidiaries of the Transport Holding Company . The British Road Services were for long-distance freight in theResponsible in the United Kingdom . Immediately after the Second World War, there was a noticeable shortage of heavy trucks in the UK. Many small haulage companies were not strong enough to procure and operate long-distance lorries. The resulting problems in the transport industry were a reason for the formation of the BRS .The BRS was commissioned to develop a heavy, four-axle chassis with a total mass of 22 tonnes to remedy the defect . 

Bristol Commercial had no experience in the development of heavy four-axle trucks, especially the construction of the two steerable front axles caused problems. The BRS left Bristol Commercial therefore hire three chassis different manufacturers to evaluation purposes . 

Trials also showed that the 8.14L AVW engine developed by Bristol Commercial was under performance for the trailer-to-trailer operation. Therefore, the O.600 of was Leyland Motors , a diesel engine with 9.8 liter displacement used. Later, this engine was powered by the O.680 , also from Leyland. Such vehicles were given the type designation HG6L ( H eavy G oods - 6- cylinder engine from L eyland). The first vehicles were delivered from 1952. The overall length of the chassis was 9093 mm (29 feet 10 inches).

 The engine powered via the clutch and a Bristol - five-speed gearbox, the simply translated rear axle. This was considered sufficient as trucks should only be used in the United Kingdom. The differential gearwas a bevel gearbox from Bristol Commercialinstalled with a ratio of 6.33: 1, which was accessible via a hatch in the loading area. The air brake from Westinghouseworked on the first, third and fourth axle. The electrical system operated at a voltage of 24 V. The tank with a capacity of 32 gallons (145 liters) allowed a range of about 300 miles (about 482 km). The cabs came from different manufacturers. The production of the HG ended after four years 1956.

Apart from the flatbed version HG , the semitrailer HA was also produced from 1955 onwards .

 By 1964, 653 units had been delivered to the BRS . In contrast to the HG this had only two axes. Since the O.680 engine was problematic in practical use, Gardner's 6LX , also a six-cylinder diesel engine, was used for the last vehicles . Together with this engine, a six-speed gearbox was installed. These vehicles were given the type designation HG6G ( H eavy G oods - 6- cylinder engine from Gardner). A total of 946 HA built for a total mass of 24 t.