DKW hobby
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The DKW Hobby is a motor scooter that DKW and Auto Union GmbH built from 1954 to 1957 in an edition of 45,303 pieces. In 1953, the company decided to get into the scooter business, having previously rejected Piaggio's offer to produce the Vespa under license. The Hobby was the best-selling German scooter in 1955.
From 1957 to 1962 the Manufacture de Machines du Haut-Rhin S. A ( Manurhin ), Mulhouse , built the DKW Hobby under license. A noticeable difference compared to the original is the continuous sheet metal cladding of the body in the area of the rear wheel; the original had a cutout there with an inserted aluminum grille.
construction
The Hobby is an in-house design by DKW with a welded central tubular frame, which offers the access typical for scooters; it extends from the steering head to the mounting of the rear swing arm . The tank and engine are installed under the driver's seat. The vehicle is fully disguised, with the front shield in front of the driver pulling up under the handlebars and effectively protecting against road dirt. The rear wheel cover can be folded up forwards to reveal the drive unit. Relatively large wheels (16 ″) as well as a telescopic fork at the front and the rear swing arm with rubber compression suspension are the defining design features of the chassis. Because of the high position of the chain sprocket - due to the forward-angled installation of the engine-gearbox unit - the rear wheel swing arm is set at a steep angle.
The scooter was initially only available as a single seat, because the front brake was relatively weak and the body too unstable for pillion rider use. From May 1955 the Hobby-Luxus appeared with a front full-hub drum brake that was enlarged from 105 to 125 mm in diameter. The rear body was reinforced so that the load capacity increased from 103 kg to 156.5 kg. The chain got a closed chain case, a speedometer was now standard and, in keeping with the spirit of the times, the scooter received more chrome jewelry. The price for the Hobby-Luxus was 950 DM, pillion pillows and footboards were available as special equipment. The original version of the scooter was reduced in price as Hobby I and now cost 795 DM.
transmission
A special feature of the DKW scooter is the continuously variable belt transmission , Uher system , which made it the first German two-wheeler with a fully automatic transmission. The two conical halves of the front pulley are pressed together by weights as the engine speed increases, which it pulls outwards due to the centrifugal force . The halves of the similarly constructed rear pulley, which are pretensioned by a spring, move away from each other accordingly. As a result, the wide V-belt runs on different diameters, the total transmission can vary between 1: 24.4 and 1: 8.33. The engine power is transmitted from the driven pulley to the rear wheel via a countershaft and a gear reduction with chain.
Instead of the usual clutch lever, the DKW Hobby has a release lever on the left of the handlebar to bring the belt drive into neutral before stopping. It must be pulled in order not to stall the engine, but only at a speed of less than 5 km / h.
engine
The Hobby is powered by a fan-cooled DKW single-cylinder two-stroke engine with a displacement of 74 cm³. It has reverse flushing and mixture lubrication (1:25). With the “fresh oil mixture lubrication” from DKW you don't need to fill up with a mixture, you can pour the oil into the filler neck and then add the pure gasoline. An insert in the tank nozzle (“shell mixer”) ensures that the two are sufficiently mixed. There is no kick starter to start up , but a rope pull that can be pulled up by hand. The 3 PS - according to other sources 3.5 PS (2.6 kW) - of the small motor bring the scooter to a top speed of 60 km / h and enable an acceleration from standstill to 40 km / h in 8.5 seconds solo or in 11.5 seconds with two people.
Technical specifications
| DKW hobby | Data |
|---|---|
| engine | 1-cylinder two-stroke |
| Displacement | 74 cc |
| Bore × stroke | 45 mm × 47 mm |
| Max. power | 3 HP (2.2 kW) at 5000 rpm |
| Max. Torque | 4.7 Nm at 4250 rpm |
| compression | 6.1 to 6.3: 1 |
| cooling | Air cooling with fan |
| transmission | stepless |
| frame | Central tubular frame |
| Front suspension | Telescopic fork |
| Rear suspension | Swing arm with rubber element |
| wheelbase | 1350 mm |
| tires | 2.50 "× 16" |
| Empty weight (without driver) | approx. 80 kg |
| tank | under the driver's seat, volume approx. 6 liters |
| Standard consumption * | 1.75 l / 100 km (mixture) |
| Top speed | 55-60 km / h |
| price | 795-990 DM |
* The "standard consumption" according to DIN 70030 was determined with a constant three quarters of the maximum speed (here 45 km / h) on a flat stretch.
literature
- New type of scooter with continuously variable transmission. In: Motor vehicle technology 12/1954, p. 381 (short re-introduction of the DKW Hobby).
- Audi AG: The wheel of time. Delius Klasing, 3rd edition, ISBN 3-7688-1011-9 .
- DKW brochure MB 514 (400 K 112 XX) from 1956.
- Reinhard Lintelmann: The scooters and small cars of the fifties. 3rd edition, Verlag Walter Podszun, Brilon 1995, ISBN 3-86133-136-5 .
- Siegfried Rauch: DKW - The story of a global brand. 3rd edition, Motorbuch Verlag, Stuttgart 1988, ISBN 3-87943-759-9 .
- Jörg Sprengelmeyer: DKW motorcycles from Ingolstadt 1949–1958. Johann Kleine Vennekate Verlag, Lemgo 2002, ISBN 3-935517-04-1 .
Web links
Individual evidence
- ^ Frank Rönicke: Type compass DKW - Motorcycles 1920–1979 . Motorbuch-Verlag, Stuttgart 2007, ISBN 978-3-613-02633-9 .
- ↑ a b c website DKW motorcycles . Retrieved November 13, 2016.
- ^ Website Arcor about Edmond Uher ( Memento from November 13, 2016 in the Internet Archive ). Retrieved November 13, 2016.
- ^ Website DKW Auto Union: In two-cycle 1/1955.
- ^ Siegfried Rauch: DKW - The history of a world brand . 3rd edition, Motorbuch-Verlag, Stuttgart 1988, ISBN 3-87943-759-9 .
- ↑ a b sales brochure MB 514 (400 K 112 XX)
- ^ Website DKW Auto Union: In two-stroke 7/1955 . Retrieved November 13, 2016.
