Fire protection in a piston-cylinder unit
AssigneeZF Sachs AG
InventorsPeter Wirth, Wolfgang Bach, Hassan Asadi, Gerald Fenn, Hans Luksch
Life of this patent
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Abstract
Piston-cylinder unit comprising a cylinder in which a work space is filled with a work medium and which is limited by a closure and is sealed by at least one seal. The closure is fixed axially by a positive engagement with the cylinder up to a temperature threshold and the closure can carry out an axial movement for relieving pressure above the temperature threshold. A cutting device cancels the sealing function of the seal during the axial movement of the closure for relieving pressure.
Claims15
A piston-cylinder unit comprising:
- a cylinder having an inner wall bounding a work space filled with a working medium;
- a closure fixed axially with respect to said cylinder by positive engagement with the cylinder, said closure bounding said work space and being sealed with respect to said inner wall by a circumferential seal, said closure being axially moveable with respect to said cylinder when a temperature threshold is exceeded;
- and
- a cutting device which cuts said seal as said closure moves axially with respect to said cylinder, whereby said working medium can escape from said working space.
A piston-cylinder unit as 5 wherein said closure comprises a circumferential groove which receives said tongue-like projection, said circumferential groove having a side wall.
Dependencies are inferred from the claim text.