US 10,094,475 B2Granted

Piston for a compressed air control valve

AssigneeWABCO GmbH

InventorsLars Didwiszus, Bernd-Joachim Kiel, Thomas Muller, Manuel Nave

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Abstract

A piston, e.g., for a control valve in a vehicle compressed air system, is housed in a cylinder in an axially displaceable manner along a longitudinal center axis separating a first cylinder chamber and a second cylinder chamber. The piston has a peripheral annular groove of approximately rectangular cross-sectional in which a sealing ring is inserted, the free end of which is disposed on the inner cover surface of the cylinder. The sealing ring defines, together with at least one groove wall, at least one pressure support chamber. The piston also comprises, in the region of the annular groove, at least one axial opening, which joins the at least one pressure support chamber to the associated first or second cylinder chamber. A pneumatic or hydraulic connection independent of any geometric deformations of the sealing ring is enabled between at least one cylinder chamber and the associated pressure support chamber.

Claims21

Dependent claims

A compressed air system of a vehicle, comprising:

a control valve comprising a relay valve, the relay valve comprising:
a cylinder including an inner circumferential surface, and
a piston that is insertable into the cylinder and axially displaceable along a longitudinal center axis of the cylinder to separate a first chamber of the cylinder and a second chamber of the cylinder from one another, the piston comprising:
a circumferential annular groove having an approximately rectangular cross sectional geometry and including a groove base, a first groove wall that extends in a radial direction outward from the groove base, and a second groove wall that extends in the radial direction outward from the groove base,
a sealing ring that is insertable into the circumferential annular groove, and
at least one first slit-shaped cutout extending in the radial direction and having an approximately rectangular cross sectional geometry in an area of the annular groove,
wherein the sealing ring and the first groove wall of the annular groove solely define a first pressurized-support chamber,
wherein, around an entire first circumference of the circumferential annular groove, the sealing ring extends from the first groove wall to the second groove wall, the first circumference being located in the radial direction outward from the first pressurized-support chamber,
wherein the at least one first slit-shaped cutout connects the first pressurized-support chamber to the first chamber of the cylinder, and
wherein a radial inner end portion of the at least one first slit-shaped cutout has a rounding about an axis that runs parallel to the longitudinal center axis of the cylinder.

7 more elements

A compressed air system of a vehicle, comprising:

a control valve comprising a relay valve, the relay valve comprising:
a cylinder including an inner circumferential surface, and
a piston that is insertable into the cylinder and axially displaceable along a longitudinal center axis of the cylinder to separate a first chamber of the cylinder and a second chamber of the cylinder from one another, the piston comprising:
a circumferential annular groove having an approximately rectangular cross sectional geometry and including a groove base, a first groove wall that extends in a radial direction outward from the groove base, and a second groove wall that extends in the radial direction outward from the groove base,
a sealing ring that is insertable into the circumferential annular groove, and
at least one first axial aperture in an area of the annular groove,
wherein the sealing ring and the first groove wall of the annular groove solely define a first pressurized-support chamber,
wherein the at least one first axial aperture connects the first pressurized-support chamber to the first chamber of the cylinder, and
wherein, around an entire first circumference of the circumferential annular groove, the sealing ring extends from the first groove wall to the second groove wall, the first circumference being located in the radial direction outward from the first pressurized-support chamber.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/777,807Filed 14 Feb 2014
Priority: DE 10 2013 005 71130 Mar 2013
Published: US 2016/0281855 A129 Sep 2016
Granted: 9 Oct 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F16J 15/3268
With elastic sealings, e.g. O-rings: mounting of sealing rings
F16J 15/164
Between relatively-moving surfaces: the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
F16J 15/3204
With elastic sealings, e.g. O-rings: with at least one lip
F16J 15/3224
With at least one lip: capable of accommodating changes in distances or misalignment between the surfaces, e.g. able to compensate for defaults of…