The invention relates to a stamp-sealing unit comprising a punch designed as a sonotrode (8), and a die (5), said die (5) having an opening (15) and the punch being able to be moved in and out of the opening (15) in the stamping direction. The invention also relates to an ultrasonic processing device for stamping stamped parts out of a stamping material (2) and for sealing the stamped parts to unprocessed products (21).

The invention relates to a stamp-sealing unit comprising a punch designed as a sonotrode (8), and a die (5), said die (5) having an opening (15) and the punch being able to be moved in and out of the opening (15) in the stamping direction. The invention also relates to an ultrasonic processing device for stamping stamped parts out of a stamping material (2) and for sealing the stamped parts to unprocessed products (21).

A helical coiled seal for sealing a barrel-shaped cylinder piston-cylinder assembly, comprising: a piston-sealing C-shaped ring; a connecting C-shaped ring comprising an inward wing protruded inwardly from a section near a first end on an inner perimeter of the connecting C-shaped ring, and an outward wing protruded outwardly from a section near a second end on an outer perimeter of the connecting C-shaped ring; and a cylinder-sealing C-ring; wherein the piston-sealing C-ring is connected end-to-end to the first end of the connecting C-ring and cylinder-sealing C-ring is connected end-to-end to the second end of the connecting C-ring forming a three-ring helical structure having a contraction-dilation response time sufficiently short required for the up-down stroke speed of the cylinder piston-cylinder assembly.

A piston ring includes an annular body having: an inner circumferential surface and an outer circumferential surface; one side surface and the other side surface substantially orthogonal to the inner circumferential surface; and a pair of joint ends. The outer circumferential surface includes an inclined surface and an abutment surface. In a direction connecting the one side surface and the other side surface, a maximum width W1 of the abutment surface at the joint end is 80% to 150% of a maximum width W2 of the abutment surface in a portion other than the joint end. In the body, a two-axis difference (d2d1) between a diameter d1 in a first axis direction passing through a central position of the joint and a diameter d2 in a second axis direction orthogonal to the first axis direction is greater than 0.25 mm and less than +0.36 mm.

A ringset is configured to be arranged on a piston for sealing a gas in a high-pressure region of a cylinder in the absence of oil or other liquid lubricant. The ringset includes one or more rings made from a high-strength material as a sealing element. The ringset also includes a solid lubricant applicator configured to provide lubrication between the one or more rings and a bore of the cylinder. For example, the ring can support pressure loads from high-pressure gas without breaking, while the applicator need not act as a seal. As the piston reciprocates in the bore, the applicator slides against the bore and applies solid lubricant material to the bore, resulting in a solid lubricant film on the bore against which the sealing element may slide. The applicator includes a material such as a graphite, a polymer, or other suitable solid lubricant.

The present disclosure provides a sealing ring assembly with one or more piston-integrated gap cover features, configured to seal a high-pressure region from a relatively lower pressure region of a piston and cylinder device. The sealing ring assembly may include two rings which each may include one or more ring segments. The one or more gap-cover features, which may be in the form of protrusions in the piston ring groove, may engage with corresponding flat sections of the ring segments. As the sealing ring wears, the gap-cover features may stay engaged with the ring segments, thereby maintaining a seal.

An oil ring (1) includes an oil ring body (10) and a coil expander (20). The oil ring body (10) includes a pair of rail portions (12) each including an end portion of an outer periphery having a land (30) formed protruding radially outward from each rail portion (12). The land (30) includes an upper axial portion (31) and a lower axial portion (32) facing opposite to each other in an axial direction, a tapered portion (33) having one axial end contiguous to the upper axial portion (31) via a first curved portion (35), and a protruding portion (34) having one of axial ends contiguous to the tapered portion (33) and the other axial end contiguous to the lower axial portion (32) via a second curved portion (36). The protruding portion (34) is protruding in a direction perpendicular to the tapered portion (33).

An oil ring (1) includes an oil ring body (10) and a coil expander (20). The oil ring body (10) includes a pair of rail portions (12) each including an end portion of an outer periphery having a land (30) formed protruding radially outward from each rail portion (12). The land (30) includes an upper axial portion (31) and a lower axial portion (32) facing opposite to each other in an axial direction, a tapered portion (33) having one axial end contiguous to the upper axial portion (31) via a first curved portion (35), and a protruding portion (34) having one of axial ends contiguous to the tapered portion (33) and the other axial end contiguous to the lower axial portion (32) via a second curved portion (36). The protruding portion (34) is protruding in a direction perpendicular to the tapered portion (33).

A piston ring (6) which is arranged with radial and axial play in an associated piston ring groove (5) in a piston (1) of a reciprocating internal combustion engine can be stabilized to prevent tilting on and contact with the radially outer edge of the piston ring groove (5) by the cross section of the piston ring (6) and/or the piston ring groove (5) being designed in such a manner that a gap is formed between the lower side of the piston ring (6) and the lower supporting surface of the associated piston ring groove (5), said gap opening vertically radially outwards in the radial direction and, when the piston ring (6) is not subjected to a load, remaining open to the outside irrespective of the temperature of the piston (1) for as long as the piston ring (6) is not loaded by pressure on the top side. The effect achieved by this is that, when a piston (1) is deformed under the action of heat during operation, the initial contact between the lower side of the piston ring (6) and the opposite, lower supporting surface of the piston ring groove (5) begins at least in a region of the lower side of the piston ring (6), which region faces the piston axis, and rubbing of the piston ring (6) on the radially outer edge of the piston ring groove (5) is prevented.

A combination of piston rings assembled to a piston of an internal combustion engine includes four compression rings. An outer peripheral surface of a first compression ring includes a barrel surface, an outer peripheral surface of a second compression ring includes an outer peripheral end portion and a taper surface, an outer peripheral surface of a third compression ring includes an outer peripheral end portion and a taper surface, and an outer peripheral surface of a fourth compression ring includes an outer peripheral end portion and a taper surface.