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The Ikarus 250 is a
Designed as a high-floor two-axle bus, the Ikarus 250 has a semi-self supporting body, with the engine installed under the floor at the back, following the configuration pioneered in
high-floor
High-floor describes the interior flooring of commuter vehicles primarily used in public transport such as trains, light rail cars and other rail vehicles, along with buses and trolleybuses. Interior floor height is generally measured above the ...
bus used as a coach for long-distance service. It was made from 1968–1989, alongside the smaller Ikarus 256, by the Hungarian bus manufacturer Ikarus.
Technical description
Designed as a high-floor two-axle bus, the Ikarus 250 has a semi-self supporting body, with the engine installed under the floor at the back, following the configuration pioneered in West Germany
West Germany is the colloquial term used to indicate the Federal Republic of Germany (FRG; german: Bundesrepublik Deutschland , BRD) between its formation on 23 May 1949 and the German reunification through the accession of East Germany on 3 O ...
by Setra
Setra is a German bus brand of EvoBus GmbH, itself a wholly owned subsidiary of Daimler Truck AG.
The name "Setra" comes from "selbsttragend" (self-supporting). This refers to the integral nature of the construction of the vehicles back in th ...
in the 1950s and 1960s. The body platform incorporates two airsprung beam axle
A beam axle, rigid axle or solid axle is a dependent suspension design in which a set of wheels is connected laterally by a single beam or shaft. Beam axles were once commonly used at the rear wheels of a vehicle, but historically they have als ...
s, with the rear axle being a planetary axle. The axles have two hydraulic shock absorber
A shock absorber or damper is a mechanical or hydraulic device designed to absorb and damp shock impulses. It does this by converting the kinetic energy of the shock into another form of energy (typically heat) which is then dissipated. Most sh ...
s each. Twin tyres are fitted on the rear axle, whilst single tyres are fitted on the front axle. Their size is . The steering system is a hydraulically assisted ball-and-nut steering system. In total, the bus has three different braking systems: A pneumatic dual-circuit braking system, an exhaust braking system and a spring-loaded parking brake.
An MAN D 2156 engine, built under licence by Rába, powers the bus. It is a straight six-cylinder, naturally aspirated, liquid-cooled, Diesel engine
The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-call ...
with direct injection, displacing . The rated power (DIN 70020) is , the rated torque (DIN 70020) . The torque is transmitted to a fully synchronised five-speed gearbox via a single-disc dry-clutch; a six-plus-one-speed gearbox was also available as a factory option. With the default five-speed gearbox, the bus can reach a top speed of . It seats between 42 and 46 passengers.
Bibliography
*Werner Oswald: ''Kraftfahrzeuge der DDR''. 2nd edition. Motorbuch-Verlag, Stuttgart 2000, , p. 313External links
* * {{Ikarus Buses Ikarus buses Coaches (bus) Step-entrance buses Vehicles introduced in 1968