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US 6,203,022 B1Granted
Annular sealing element
AssigneesLucas Industries public limited company, Contitech Forteile GmbH
InventorsMartin Struschka, Ulrich Beier
Life of this patent
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AssigneesLucas Industries public limited company, Contitech Forteile GmbH
InventorsMartin Struschka, Ulrich Beier
Estimating the term…
An annular sealing element (16) for sealing an annular gap between the inner surface of a cylindrical wall and a cylindrical piston which can be displaced axially relative to said wall and is arranged concentrically therewith, has two separate annular and axially adjoining parts (42, 44), of which the first part (42) consists of an elastomer material and the second part (44) consists of a rigid material. In order to ensure, in conjunction with a displaceable body of a valve, that the opening and closing behavior of the valve is as constant as possible, the two parts (42, 44) are connected to one another in a releasable manner, and the part (44) made of rigid material has an axial protrusion (46) which is formed integrally with it, runs around it in the form of a ring, passes more or less to the full extent through the part (42) made of elastomer material and has its end surface covered over to the full extent by the part (42) made of elastomer material. The axial protrusion (46), which runs around in the form of a ring, is designed and arranged such that a radial wall thickness Si of the part (42) made of elastomer material, on the radially inner flank of said protrusion, is approximately equal to a radial wall thickness Sa on the radially outer flank of said protrusion. The radial extent S of the protrusion (46) is not more than 70% of the sum of the wall thicknesses Si+Sa.
Annular sealing element for sealing an annular gap between the inner surface of a cylindrical wall and a cylindrical piston which can be displaced axially relative to said wall and is arranged concentrically therewith, it being the case that the annular sealing element has two annular and axially adjoining parts (42, 44), of which the first part (42) consists of an elastomer material with thickness (D) and the second part (44) consists of a rigid material, it being the case that the part (44) made of rigid material has a protrusion (46) which is formed integrally with it, runs around it in the form of a ring, projects axially into the second part (42), has a radial extent S and is designed and arranged such that a section of the second part (42) which butts against the radially inner flank of said protrusion has a radial wall thickness Si+Sa, characterized in that
Main cylinder (10) for a hydraulic vehicle braking system, having a housing (12) which has a bore (14), which extends along a longitudinal axis (A) and of which one end is sealed by an end wall belonging to the housing (12) of the main cylinder (10) and the other, opposite end is sealed by a closure element (16), it being the case that accommodated in a sealing and axially displaceable manner in the bore (14), adjacent to the closure element (16), is a piston (18) which can be actuated through said closure element and has a central valve (20), which permits a fluid connection between a fluid reservoir and a pressure chamber (28), delimited in the bore (14) by the end wall and piston (18), and which, when the piston (18) is not actuated, is kept in the open position by an abutment component (transverse pin 34) which acts on the closure element (16), characterized in that the closure element (16) includes two annular and axially adjoining parts (42, 44) connected to one another in a releasable manner, the first part (42) consists of an elastomer material with thickness (D) and the second part (44) consists of a rigid material having a protrusion (46) which is formed integrally with the second part (44) and running around it in the form of a ring, projecting axially into the second part (42), wherein the second part (42) has a radial extent S and is designed and arranged such that a section of the second part (42) which butts against the radially inner flank of said protrusion has a radial wall thickness Si and that section of the second part (42) which butts against the radially outer flank of said protrusion has a radial wall thickness Sa, and the radial extent S of the protrusion (46) is not more than 70 percent of the sum of the wall thicknesses Si+Sa, the protrusion (46) which runs around in the form of a ring and is formed on the part (44) made of rigid material, passes substantially through the thickness (D) of the part (42) made of elastomer material in the axial direction, the part (42) made of elastomer material covers over the end surface of the protrusion (46) to the full extent, and the wall thickness Si is approximately equal to the wall thickness Sa, the parts (42 and 44) being in surface to surface contact, and non-rotatable with respect to each other during use.
Dependencies are inferred from the claim text.