Piston ring

• US 20050051970A1
• Filed: 09/10/2004
• Published: 03/10/2005
• Est. Priority Date: 09/10/2003
• Status: Abandoned Application

• Current Assignee: Hoerbiger Kompressortechnik Holding GmbH (Hoerbiger-Stiftung)
• Original Assignee: Hoerbiger Kompressortechnik Holding GmbH (Hoerbiger-Stiftung)
• Inventors: Edelmann, Wolfgang
• Application Number:
  US10/937,733
• Publication Number:
  US 20050051970A1
• Time in Patent Office: Days
• US Class Current: 277/435
• CPC Class Codes: F16J 9/16 obtained by stacking of rings

Abstract

A twin piston ring includes of two concentric rings (1, 2) whereby the first ring (1) is designed as an L-shaped ring and the second ring (2) is designed as an inserted cross sectioned ring with a gap (6) that is offset relative to the one of the first ring (1). The inserted ring (2) is arranged on the pressure side (12) of the piston ring to ensure uniform wear of both rings (1, 2) at unchanging good sealing effect and to ensure simple manufacturing whereby, in addition, the inserted second ring (2) is provided with a projection (18) overlapping the gap (5) of the L-shaped ring (1) at the pressure side (12, 15) as well as the inner side (16) near the axis, and whereby the projection (18) forms at the same time a locking device against twisting of the rings (1, 2) against one another.

Claims

1. A piston ring, particularly for a reciprocating piston compressor for specific light gases, consisting of two concentric rings (1, 2) having at least one gap (5, 6) each whereby the first ring (1) has a first arm with an essentially L-shaped cross section extending inwardly in the direction of the axis and a second arm perpendicular thereto extending outwardly, and whereby the second ring (2) has a cross section fitting the missing section in the essentially L-shaped cross section in the form of a rectangular or square recess into which the first ring (1) is inserted opposite of its gap edge(s) (5), which is (are) rotated in circumferential direction or which is (are) disposed opposite the off-set gap edge(s) (6) while sealing the clearance (8, 11) between the piston (4) and the cylinder (7), wherein the second ring (2) is fitted into the L-shaped cross section of the first ring (1) at the pressure side (12) and whereby said second ring (2) is provided with a projection (18) overlapping the associated gap (5) of the first ring (1) at the pressure side (12, 15) as well as the groove (17) manufactured into the first ring (1) at the inner side (16) near the axis.

2. A piston ring according to claim 1, wherein the second ring (2) is provided with pressure compensation grooves (21) on surfaces (19, 20) facing the first ring (1).

3. A piston ring according to claim 1, wherein essentially radial oriented pressure relief grooves (23) are arranged on a face (22) of both rings (1, 2) at the pressure side.

4. A piston ring according to claim 1, wherein a pressure-compensation bore (24) is arranged in the region of the projection (18) of the second ring (2).