Podium joints
Platform joints are joints that, depending on the design, belong to the constant velocity joints , wide-angle joints and sliding joints .
A shaft end (shaft stub) carries two or more pins , which are often provided with balls, rollers or ball bearings to reduce friction and engage in the corresponding receptacle in the counterpart. According to the number of tenons, podium joints are divided into:
- Bipod joints (two pins)
- Tripod joints (three pins)
- Quattropod joints (four tenons).
The advantage of the podium joints is a large displacement path with flexion angles of up to 60 °, low frictional resistance and good torque absorption.
history
Podium joints appeared as bipodal joints as early as the middle of the 19th century and were intended, among other things, to replace universal joints with uneven angular speeds between the two shaft ends. They found their first industrial application in 1902 by Robert Schwenke , who used them in 1905 for the first German construction of a small car with front-wheel drive . Popular they were, as John B. Flick it in 1921 for the Ford T with four-wheel drive used. In 1935, John W. Kittredge saw the first industrial application for a tripod joint. A quattropod joint was designed for the first time in 1913.
source
- Hans Christoph Seherr-Thoss, Friedrich Schmelz, Erich Aucktor: Joints and cardan shafts: calculation, design, applications. 2nd edition, Springer, Berlin Heidelberg 2002, ISBN 3-540-41759-1 . P. 33 ff.
- Halwart Schrader: German Cars 1886–1920 . 1st edition. Motorbuch Verlag, Stuttgart 2002, ISBN 3-613-02211-7 . P. 356 f.
Footnotes
- ^ A b Hans-Christoph Seherr-Thoss, Friedrich Schmelz, Erich Aucktor: Joints and cardan shafts - calculation, design and applications , p. 33ff, Springer Verlag