# Hydrospring

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{{Short description|Mechanical device}}

A '''hydrospring''' or '''hydro-spring''' is a [spring](/source/Spring_(device)) damped by [hydraulic fluid](/source/hydraulic_fluid) (typically [oil](/source/oil)) being driven through holes in a piston, as the piston moves in response to a force. 

The spring is often made of rubber. Inside a rubber hydrospring there are hydraulic [viscous damping](/source/viscous_damping) systems which damp movement in all three directions but require very few parts. Even the slack adjustment may be integrated into the element.<ref>{{Cite conference|url=http://railknowledgebank.com/Presto/content/GetDoc.axd?ctID=MTk4MTRjNDUtNWQ0My00OTBmLTllYWUtZWFjM2U2OTE0ZDY3&rID=NDI1NA==&pID=Nzkx&attchmnt=VHJ1ZQ==&uSesDM=False&rIdx=MzI0Ng==&rCFU=|format=pdf|title=Wear and Energy Saving Bogie Design with Rubber Primary Springs – Principles and Experiences|last=Hecht|first=Markus|conference=IHHA Specialist Technical Session (STS)|location=Kiruna, Sweden|year=2007}}</ref>

==Application==
Hydrosprings are used mainly as [shock absorbers](/source/shock_absorbers) in applications such as damped suspension in railway [bogie](/source/bogie)s, [bulldozer](/source/bulldozer) blade shock absorbers and as [recoil absorbers for artillery](/source/Hydro-spring).{{cn|date=April 2026}}

==Gallery==
<gallery>
Rubber Hydrospring.png|A railway type rubber hydrospring<ref>{{cite patent |country=EP |number=1369616 |status=patent}}</ref>
Rubber Hydrospring Cross Section Up.png|A railway type rubber hydrospring in relaxed state
Rubber Hydrospring Cross Section Down.png|A railway type rubber hydrospring in compressed state
60PounderRecoilMechanismDiagram.jpg|Hydro-spring recoil system of British WWI [60 pounder](/source/60_pounder) gun, with working explained
</gallery>

==See also==
* [Dashpot](/source/Dashpot)
* [Garter spring](/source/Garter_spring)

==References==
{{Reflist}}
* [https://web.archive.org/web/20060811053146/http://www.afms1.belvoir.army.mil/dictionary/h_terms.htm Army Dictionary - see ''hydrospring'']
* [https://web.archive.org/web/20060811052709/http://www.afms1.belvoir.army.mil/dictionary/r_terms.htm Army Dictionary - see ''recoil cylinder'']
* [https://web.archive.org/web/20070311012655/http://resistoflexindia.com/railways_hydrospring.asp A railway hydrospring]

==External links==
*[https://chinacustomspring.com/ Custom-Made Spring]

Category:Springs (mechanical)

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Adapted from the Wikipedia article [Hydrospring](https://en.wikipedia.org/wiki/Hydrospring) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Hydrospring?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.