# US 11,898,640 B2 · Ring seal

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- Number: US 11,898,640 B2
- Document ID: US11898640B2
- Status: Granted
- Kind: B2
- Application number: 17/893,298
- Filed: 2022-08-23
- Published: 2023-02-23
- Granted: 2024-02-13
- Earliest claimed: 2021-08-23
- Assignees: Bruss Sealing Systems GmbH
- Applicants: Bruss Sealing Systems GmbH
- Inventors: Manfred Brand; Henning Schmidt; Sebastian Teuscher
- Web page: https://patentgrep.com/patent/US11898640B2

## CPC

- F16J 15/3204: with at least one lip
- F16J 15/3284: characterised by their structure; Selection of materials
- F16J 15/56: Other sealings for reciprocating rods
- F15B 15/1452: {Piston sealings}
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR

## Abstract

The invention relates to a ring seal for sealing a gap between two parts that can be moved axially to one another, with a cross-sectional profile, which is constant in the circumferential direction and has a symmetrical design with respect to a radially oriented axis of symmetry (S), and with a dynamic sealing surface arranged radially outside or radially inside on the cross-sectional profile, and a groove base area arranged radially opposite the sealing surface, wherein that the sealing surface has a first central section (I) which, in the cross-sectional profile, has a radius R of R<B/2 with respect to an axial width B of the ring seal, and the sealing surface further has a second and third section (II, III) which enclose the first central section between them, and that the sealing surface in the region of the second and third sections (II, III) is in each case embodied as a planar annular surface which is oriented at an angle (α) of 60 to 85 degrees with respect to the axis of symmetry of the cross-sectional profile.

## Claims

### Claim 1

A ring seal for sealing a gap between two parts that can be moved axially relative to one another, having
a cross-sectional profile which is constant in the circumferential direction and has a symmetrical design with respect to a radially oriented axis of symmetry (S), and
a dynamic sealing surface arranged radially outside or radially inside on the cross-sectional profile, and
a groove base area arranged radially opposite the sealing surface,
wherein the sealing surface has a first central section (I) having, in the cross-sectional profile, a radius R of R<B/2 with respect to an axial width B of the ring seal,
wherein the sealing surface further has a second and third section (II, III) which enclose the first central section (I) between them,
wherein the sealing surface in the region of the second and third sections (II, III) is embodied as a planar annular surface in each case, which is aligned at an angle (α) of 60 to 85 degrees with respect to the axis of symmetry (S) of the cross-sectional profile,
wherein starting from the second and third sections (II, III), the sealing face transitions into a side face in each case,
wherein the side faces are oriented at an angle (β) of 5 to 30 degrees to the axis of symmetry (S),
wherein the ring seal is tapered in a region between the side faces and the groove base area, and
wherein the region of the ring seal that is tapered is formed by two opposing concave recesses and thereby has a reduced width (B2) at a narrowest point of the region of the ring seal that is tapered.

### Claim 2 (depends on 1)

The ring seal according to claim 1, wherein starting from the first section (I), the sealing surface merges tangentially into the second and third sections (II, III).

### Claim 3 (depends on 1)

The ring seal according to claim 1, wherein the ring seal has a larger maximum width (B) in the region of the side faces than in the region of the groove base area.

### Claim 4 (depends on 1)

The ring seal according to claim 1, wherein a depression extending in the circumferential direction of the ring seal is provided in the groove base area.

### Claim 5 (depends on 1)

The ring seal according to claim 1, wherein the ring seal has a larger maximum width (B) in the region of the side faces than in the region of the groove base area.