BMW R 52
The BMW R 52 was a touring motorcycle in the 500 cm³ class from the German motorcycle manufacturer BMW .
In the construction period from 1928 to 1929, 4,377 R 52s were produced.
history
development
From July 1928, BMW produced the R 52 for the 500 cm³ class; together with the likewise new and largely structurally identical R 62 for the 750 cm³ class.
BMW continued the modular principle with this motorcycle. The chassis and gearbox with the basic engine were largely identical; The differentiation for the displacement classes with 500 cm³ and 750 cm³ and according to sports and touring models was implemented by two crankshafts with strokes different by 10 mm, matching cylinders with the same bore and head or side-controlled cylinder heads and cylinders.
The R 52 was the last motorcycle from BMW in this displacement class with SV valve control .
marketing
The product launch - initially the two touring motorcycles R 52 and R 62 and shortly afterwards the two sports models R 57 and R 63 - took place on a modest scale, because the new models with pressed steel frames were presented at the German Motor Show in November 1928 in Berlin .
As a touring model with a side-controlled engine, it was the sister model of the R 57 , which was designed as a sports model. The R 52 was listed in the sales brochures together with the other tubular frame types R 57 , R 62 and R 63 in 1931.
previous version
The predecessor of the R 52 was the BMW R 42 model with 9 kW / 12 hp and essentially the same tubular frame with cardan shaft drive. The R 52 differs from this in that the front brake has been enlarged to 200 mm and the newly designed engine, which was designed as a long- stroke with a bore of 63 mm and a stroke of 78 mm .
technology
The frame was welded from tubular steel and, due to its great stability, was suitable for sidecar use.
engine
The engine with the designation M 57 was built as a two-cylinder along Boxer - four-stroke engine with a flathead engine designed. Starting with engine number 50761, the single-disc dry clutch was replaced by a two-disc dry clutch.
drive
The R 52 had a manual gearbox with a drive shaft on the right side of the unsprung rear wheel.
BMW referred to the power transmission from the gearbox to the rear wheel as a " cardan drive ", the drive shaft as a " cardan shaft " and the gearbox on the rear wheel as a "cardan housing" - technically correct it was only a shaft drive of the rear wheel, as there were no cardan joints.
The horizontally divisible gearbox housing was flanged directly to the motor housing. The 3-speed input shaft was driven directly by the single-disc dry clutch in the crankshaft's flywheel. The output shaft drove the drive shaft via a hardy disk in direct extension.
The housing of the bevel gear drive on the rear axle was filled with oil. The gearbox was filled with oil for the first time - on the R 42 it was still lubricated with grease.
The kick starter was actuated at right angles to the vehicle's longitudinal axis; the complex bevel gear redirection in the gearbox housing was no longer necessary.
Technical specifications
Parameter | Data of the R 52 |
---|---|
drilling | 63 mm |
Hub | 78 mm |
Displacement | 482 cc |
power | 12 PS (9 kW ) at 3400 min -1 |
Top speed | 95 km / h |
Empty weight | 152 kg (with sidecar 230 kg) |
Payload | 210 kg |
Tank capacity | 12.5 liters |
See also
literature
- Tragatsch: All Motorcycles , ISBN 3-87943-410-7
- Udo Stünkel: BMW motorcycles typology: All series models from 1923 . Delius Klasing, Bielefeld 2008, ISBN 978-3-7688-2451-4 .
Web links
- BMW R 52. In: BMW History. BMW AG, accessed on July 2, 2020 (dossier of the BMW Group Archives).
Individual evidence
- ↑ a b Start of production of the motorcycle models R 52, R 62, R 57 and R 63. In: BMW history. BMW AG, July 1928, accessed on July 2, 2020 (document in the BMW Group Archive).
- ^ Engine and transmission of the BMW R 52. In: BMW History. BMW AG, 1928, accessed on July 2, 2020 (document in the BMW Group Archive).
- ↑ a b c manual for BMW wheels type R 52 and R 62. In: BMW history. BMW AG, June 1928, accessed on July 2, 2020 (document in the BMW Group Archive).
- ↑ Spare parts list and tables for the BMW two-cylinder motorcycles type R 52 and R 62. In: BMW history. BMW AG, July 1930, accessed on July 2, 2020 (document in the BMW Group Archive).
class | Type | 1920s | 1930s | 1940s | ||||||||||||||||||||
3 | 4th | 5 | 6th | 7th | 8th | 9 | 0 | 1 | 2 | 3 | 4th | 5 | 6th | 7th | 8th | 9 | 0 | 1 | 2 | 3 | 4th | 5 | ||
up to 250 cm³ | Touring motorcycle | R 2 | R 20 | |||||||||||||||||||||
R 23 | ||||||||||||||||||||||||
Sport motorcycle | R 39 | |||||||||||||||||||||||
up to 500 cm³ | Touring motorcycle | R 32 | R 42 | R 52 | R 4 | |||||||||||||||||||
R 3 | R 35 | |||||||||||||||||||||||
Sport motorcycle | R 37 | R 47 | R 57 | R 5 | R 51 | |||||||||||||||||||
up to 750 cm³ | Touring motorcycle | R 62 | R 11 | R 12 | R 71 | |||||||||||||||||||
R 6 | R 61 | |||||||||||||||||||||||
Sport motorcycle | R 63 | R 16 | R 17 | R 66 | ||||||||||||||||||||
Prototypes, racing bikes | R 7 | |||||||||||||||||||||||
WR 750 | R 51 RS | |||||||||||||||||||||||
Military motorcycles | R 12 | |||||||||||||||||||||||
R 75 team |