Piston retraction spring

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Fictitious component piston retraction spring .
1. Ignition feed line 2. Exhaust
gas discharge
3. Implosion chamber
4. Piston
5. Stroke chamber
6. Piston return spring
7. Pinion rod
8. Axial pinion wheel

The piston return spring (more rarely: piston return spring or piston return spring ) is a fictitious component on distributor injection pumps .

Fictitious component

A fictitious component on combustion engines is the piston retraction spring , a spring supposedly built into cylinders , which acts against the direction of the piston force and is intended to bring the piston back to top dead center when depressurized . In connection with piston engines , it is a non-existent component, as the piston moves back due to the inertia of the flywheel . The expression has caught on.

The piston retraction spring is widely used as part of an initiation rite during training as a motor vehicle mechatronics technician . The trainee is sent to the material issue and is supposed to get this imaginary component. From there it is usually sent back with a particularly heavy component that is not what was requested, so it has to be brought back. This continues until he realizes he's being made a fool of.

Elastic bands from Hildebrand and Wolfmüller

Although reciprocating piston engines basically do not require a piston retraction spring and there is no related component, the rubber bands attached to the connecting rods on the world's first series motorcycle, the Hildebrand and Wolfmüller , had this function. The two pistons lie parallel under the running board, there is an adjustable rubber belt on both outer sides, the tension of which can be adjusted with a crank on the side of the vehicle while driving. This supported the return of the piston, in this case the rubber belts functioned as a "piston return spring".

Web links

Wiktionary: piston retraction spring  - explanations of meanings, word origins, synonyms, translations

Individual evidence

  1. ↑ Konrad Reif: Classic diesel injection systems: in-line injection pumps, distributor injection pumps, nozzles, mechanical and electronic controllers., Vieweg and Teubner Verlag 2012, ISBN 978-3834815965 , p. 148 [1]
  2. ^ Robert Bosch GmbH: Diesel engine management: systems and components , Vieweg and Teubner Verlag 2004, ISBN 978-3528238735 , p. 168 [2]
  3. ↑ image of a "retraction device" , accessed on January 29, 2018
  4. ↑ Oscar Koch: The current state of motorcycles. In: Polytechnisches Journal . 323, 1908, pp. 312-314.