Spring joint

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Universal spring joint in symmetrical design:
half of each of the two leaf springs on the edge.
Spring straight guide: two leaf springs of equal length clamped in a rectangle as opposite sides (1 and 2)

A spring joint is a technical joint in which two solid bodies are connected to one another via an elastic intermediate element.

A spring joint works maintenance-free and is particularly suitable for small swivel angles. Only the negligible small friction present within the elastic material occurs in it. The springs are deformed by bending or torsion .

Spring joint in mechanical engineering

A spring joint is used for turns or shifts joint . Its elastic restoring force makes it suitable for the storage of measuring systems that require one.

The simple spiral spring joint is z. B. used to hang a clock pendulum . Tosionsfedern serve z. B. for storing rotating measuring systems, or they are parts of torsion pendulums .

A cross spring joint (see figure above) is a swivel joint with a slightly variable center of rotation. It consists of two crossed, mostly leaf springs . Two or more parallel, mostly leaf springs, are contained in a spring straight guide element (see illustration opposite). When designed with several parallel pairs of springs, a transverse displacement of the displacement can be avoided.

Universal joints and spring straight guides are commercially available components .

Spring joint in concrete construction

Since the necessary rotational mobility between components in construction is particularly small, bearings that act like spring joints are also created there. In the concrete joint , the elastically yielding intermediate part consists of the relatively brittle material concrete . Such a “joint” is produced in one cast with the parts to be connected, which are also made of concrete, for example a pillar and the foundation below. This concrete hinge has the advantage, however, that it can tear and, among other things, give way due to creeping, thereby keeping undesired bending stresses to a minimum. In the newer "spring hinge" the resilient narrow area is heavily reinforced . The stainless steel inserts are inserted with little or no concrete cover to activate the elastic behavior of the steel.

Individual evidence

  1. ^ A b Siegfried Hildebrand : Feinmechanische Bauelemente , Hanser, p. 429
  2. ↑ Annika Raatz: Cohesive joints made of pseudo-elastic shape memory alloys in parallel robots . Vulkan-Verlag GmbH, 2006, ISBN 978-3-8027-8691-4 , p. 21–22 ( google.de [accessed on January 9, 2019]).
  3. ^ Siegfried Hildebrand: Feinmechanische Bauelemente , Hanser, page 457
  4. ↑ Cross spring joints Free-Flex.
  5. ^ A b Gregor Schacht, Steffen Marx, Nora Hoffmann: Concrete spring joints
  6. ↑ Steffen Marx, Nora Hoffmann, Gregor Schacht: Federgelenke . In: Steel construction . tape 82 , no. 12 , December 1, 2013, ISSN  1437-1049 , p. 903-910 , doi : 10.1002 / stab.201310115 ( wiley.com [accessed January 6, 2019]).