Abstract: In one surface of a ring member, a plurality of incision grooves incised in a radial direction from an inner peripheral edge up to an appropriate position and those incised from an outer peripheral edge to an appropriate position are alternately formed, and in the other surface, incision grooves continuing from the inner peripheral edge up to the outer peripheral edge are formed. In order to adapt to the expansion and the contraction due to a temperature change and a change in shape and dimension due to abrasion, the inner incision grooves and the outer incision grooves increase/decrease in width, causing the packing to expand/contract in the circumferential direction, so that the packing is capable of maintaining its contact state with a shaft to minimize the leakage of the fluid.

Abstract: A connector for plugging together with a counter-connector in a plug-in direction comprises a casing, a receptacle seal, and an oscillation absorber. The casing has a contact receptacle receiving a contact. The contact receptacle has a receptacle outer wall. The receptacle seal is disposed on the receptacle outer wall. The oscillation absorber is disposed at a distance from the receptacle seal in the plug-in direction and has a de-aeration opening extending through the oscillation absorber in the plug-in direction. A free volume extends between the receptacle seal and the oscillation absorber in the plug-in direction.

Abstract: A pressure ring includes a first pressure ring fitted in a first ring groove of a piston; and a second pressure ring fitted in a second ring groove of the piston, and positioned between the first pressure ring and an oil ring. The second pressure ring is provided with a groove that extends across a surface of the second pressure ring from an inner peripheral side to an outer peripheral side. The groove is configured such that at least one of a width and a depth of the groove becomes larger toward the outer peripheral side from the inner peripheral side.

Abstract: A decoupling element is described for a fuel injection device which is characterized in particular by a low-noise design. The fuel injection device includes at least one fuel injector, a receiving bore in a cylinder head for the fuel injector, and the decoupling element between a valve housing of the fuel injector and a wall of the receiving bore. The decoupling element is designed as a decoupling system having a spring ring and a conical washer. The fuel injection device is suitable for injecting fuel into a combustion chamber of a mixture-compressing spark-ignition internal combustion engine in particular.

Abstract: A handheld work apparatus has an internal combustion engine (9, 9?, 9?) and a starter device (8). The internal combustion engine has a piston (10, 10?) which has at least one piston ring (37, 38). In order to avoid a delay when starting the engine, at least one recess is provided in the cylinder bore (26) which bridges the at least one piston ring (37, 38) in at least one position of the piston (10, 10?) and which has a distance (n, o, p) to all function openings of the engine (9, 9?, 9?) configured in the cylinder bore (26). To reduce the compression in the combustion chamber (25), the piston (10?) has only one piston ring (37) or two piston rings (37, 38) are provided having respective piston ring gaps (39, 40) defining an angle (?) which is up to approximately 45°.

Abstract: A sealing device is provided which is capable of reducing its sliding resistance. In a sealing device 1 which is fitted into an annular groove formed in one of a housing with a shaft hole and a shaft inserted into said shaft hole and serves to seal an annular gap between these two members, and which includes a seal ring 2 made of a resin that is in sliding contact with the other of the two members, and an elastic ring 3 that is fitted between the seal ring 2 and the annular groove, the seal ring has a plurality of concave portions 22 formed on its sliding surface 20 which is in sliding contact with the other member.

Abstract: A sealing device in which a good lubricating oil film is formed along the entire circumference of a sliding surface. The sealing device (1) is fitted in an annular groove formed in either of two elements that are a housing having a shaft hole and a shaft inserted through the shaft hole, and the sealing device (1) seals an annular gap between the two elements. The sealing device (1) has a seal ring (2) sliding against the other element by relative axial movements of the two elements. In the seal ring (2), on each of axially opposite ends of a sliding surface (20) sliding against the other element, there are formed grooves (22) extending from an end surface (21) of the seal ring (2) toward the axial center of a sliding surface (20).

Abstract: An oil ring mechanism of a piston includes a circumferential ring groove formed in an outer peripheral surface of the piston, and a two-piece oil ring having a ring-shaped ring main body that is arranged in the ring groove and urged in the outer peripheral direction inside the ring groove by a coil expander arranged on the inner peripheral side of the oil ring main body. On lower side surface on a crankcase side of a side wall surface of the ring groove that is on the opposite side of the ring groove from an engine combustion chamber, first and second recessed portions that reduce the abutment area where a lower surface of the ring main body abuts against the lower side surface formed in a lower side abutment surface that serves as a surface for abutting against the lower surface of the ring main body.

Abstract: Our problem relates to a master cylinder with a U-shaped seal. Our goal is to avoid defective bleeding of hydraulic braking systems. The defects arise out of the fact that the vacuum causes the lips of the seal (21) to stick together and to stick against the wall (41). To achieve this, reliefs (42) will be created on one wall (44) of one lip (28) facing the other lip (27) and on the edge face (50) of this same lip. These reliefs will prevent the lips from sticking tightly to one another and to the wall facing the edge face of the lips. This lack of sticking will prevent a vacuum from being created between the two lips and between the edge face of the lips and the wall (41). As a result, the seal will be able to return to a position in which bleeding can be performed effectively.

Abstract: A plurality of first inclined faces (51) are provided on a side face of a seal ring (5) to be distanced away from each other. The first inclined face (51) opens to an inner circumferential face (23) and the side face of the seal ring (5). A column portion (54) is provided between adjacent first inclined faces (51). Portions at both ends of the first inclined face (51) serve as converging portions (52) that are conical smoothly-inclined faces, each converging to the adjacent column portion (54). On the column portion (54), the second inclined face (57) is formed.

Abstract: An oil ring for an internal combustion engine capable of securing an area of an oil-passing hole without deteriorating the strength of the oil ring. To achieve this the oil ring is provided with an oil-passing hole including: two arc portions disposed at both ends in circumferential direction, so as to be opposed to each other; two parallel straight portions disposed so that a widthwise direction distance therebetween is longer than a width of the arc portion; and inclined portions for connecting the arc portions and the parallel straight portions to each other.

Abstract: A piston ring for use at temperatures above 350° F. at pressures greater than or equal to about 2000 psi, comprising a gap having a gap width about 1.4 to about 2.0 times greater than a thickness of the piston ring; a height about 4.5 to about 6.4 times larger than the thickness, and a leading edge characterized by an arc having a radius of curvature of less than or equal to about 4 times the height. The piston ring may be formed of a material comprising cobalt, chromium, tungsten, and carbon. A gas compressor and method of sealing a piston using the above piston ring is also provided for.

Abstract: The invention relates to an oil control ring for pistons of internal combustion engines. The aim of the invention is to provide an improved shape-adaptation capacity in comparison to prior art, with a tangential force that enables the ring to guarantee low friction and also low oil consumption during the operation of the engine. To achieve this, the inventive oil control ring comprises a solid bearing surface that lies against the cylinder wall, in addition to parallel ring flanks, between which a radial recess that runs around the periphery is configured in the rear of the ring, said recess being designed to receive a coil spring. The peripheral region of the ring flanks is provided with undulating end faces that face towards the rear of the ring. Said undulating end faces of the upper and lower ring flanks are offset out of phase with one another.

Abstract: In mounting a combined oil control ring in a ring groove formed in a piston, the combined oil control ring is mounted in a form that an opening between but ends of an oil ring body is widened. In such an operation, it is likely that a coil expander falls off the oil ring body thus making the mounting operation cumbersome. To overcome such a drawback, a relationship L1<L2 is established. Here L1 means a axial distance between open peripheries of the groove portion and L2 means a maximum axial distance between peripheries of the groove portion.

Abstract: An oil ring for an internal combustion engine, comprising a metallic annular body (10) to be mounted around a piston (P) reciprocating inside a cylinder (C) of the engine, said annular body (10) having opposite lateral faces (11), an internal face (12) onto which will be seated a resilient expander (M), and an external contact face (13) to be seated against the internal face of the cylinder (C) and having a height (h) that is substantially smaller than the height (H) of the internal face (12). Each lateral face (11) is defined by one or more lateral face portions (11a, 11b), which are designed to reduce the moment of inertia of the annular body (10), giving higher conformability to the latter. Preferentially, but not exclusively, the annular body (10) can be further provided with channels (15, 16), extended along at least part of the ring hight and which are radially spaced back in relation to the external contact face (13).

Abstract: A valve assembly including a housing having a flow channel and an annular surface surrounding the flow channel, a slide plate movable to a closed position, and a seal ring positioned between the annular surface and the slide plate. The seal ring includes a first and second sides, a first surface extending between the first and the second sides and facing towards the annular surface of the housing, and a second surface axially spaced from the first surface and extending between the first and the second sides and facing towards the slide plate. The second surface includes a continuous annular sealing portion for contacting the slide plate when the seal ring is biased against the slide plate so that a fluid-tight seal can be formed between the continuous annular sealing portion and the slide plate, and at least one passageway positioned between the annular sealing portion and the second side.

Abstract: A flexible, resilient incompressible seal for a butterfly valve is disclosed formed from a loop having a perimeter mounting surface and a perimeter sealing surface with first and second oppositely disposed axial surfaces extend between the perimeter sealing and mounting surfaces. Channels are positioned in the axial surfaces in spaced relation around the seal. The channels extend from the perimeter mounting surface toward the perimeter sealing surface and provide fluid communication to the perimeter mounting surface allowing fluid trapped against the perimeter mounting surface to escape when compressed by the closing of the valve. A void space is positioned in the perimeter mounting surface in the form of grooves or dimples allowing the perimeter sealing surface to deform under compression when the seal is captured within the valve and substantially restrained from deforming.

Abstract: The aim of the invention is to prevent deposition of material on the piston ring flank (6) of a piston ring (3) for the piston (1) of an internal combustion engine. To this end, said piston ring is provided with channels (7) which are distributed on the circumference of said piston ring flank and which preferably are positioned radially thereon. Said channels are produced on the piston ring in a simple manner by using a laser.

Abstract: A non-sealing, lubricating piston ring for lubricating the cylinder wall of a piston housing in a combustion tool is disclosed. The lubricating piston ring is made from a lubricating material such as polytetrofluroethylene (PTFE). The shape of the PTFE ring is designed to optimize the lubricity of the piston housing, while allowing enough friction for the piston to operate properly within the piston housing during reciprocating cycling movement. The PTFE ring may have radial fins extending from an outer surface thereof that are angled to promote ring rotations, such that the ring moves easily along and efficiently lubricates the inner cylinder wall of the piston housing. The PTFE ring does not form a seal between the piston and the housing. Instead, the PTFE ring is positioned above or below a sealing ring, such as a steel piston ring which forms the seal between the piston and the piston housing.

Abstract: A cap assembly for covering an injector of a lubricant metering device to sealingly protect the injector from moisture and dirt. The injector has a generally cylindric body and an end structure narrower than the body projecting endwise from the body. The assembly has a cap including a generally cylindric tube having a side wall, an open end, a closed end and a configuration such that the cap is shaped and sized for detachable mounting on the body of the injector in a covering position in which the tube encloses the end structure of the injector. A flexibly resilient gasket has an annular shape with an inner edge sized for surrounding the end structure to enable the gasket to be sealingly secured to the structure and an outer edge sized for engaging an inner surface of the side wall of the cap and forming a fluid-tight seal thereon when the cap is mounted in its covering position.

Abstract: A unidirectional rod sealing ring adapted for forming a sealed condition in association with a member such as a piston rod or shaft axially movable in a bore of a hydraulic cylinder, the sealing ring including an elastomeric ring member having an axially facing sealing face, an opposite axially facing pressure face, a circumferential radial outer surface, and a circumferential radial inner surface, the elastomeric ring member being cooperatively receivable in an annular groove around the bore of a hydraulic cylinder with the sealing face in position in opposed relation to a first axial groove wall, and the pressure face positioned in opposed relation to an opposite second groove wall, the sealing face including at least one continuous annular bead of relatively small radial extent positioned for sealably engaging the first axial groove wall, and the radial inner surface including an inner most circumferential lip of relatively small axial extent positioned for circumferential sealed engagement with the member

Abstract: Occurrence of leakage of refrigerant around a seal member in cryogenic state is suppressed. The seal member 32 is formed from unsaturated polyester-PTFE with an unsaturated polyester mixing ratio of 20% to 35%. A plurality of slits 36 extended axially and penetrating through radially are provided in an end portion 35 of an outer circumferential wall 32a. Thus, by a synergistic effect of the use of a material small in the heat shrinkage factor and the reduction of radial shrinkage of the whole outer circumferential wall 32a attributable to the aforementioned configuration, the sealing properties in the cryogenic state are enhanced so that the occurrence of leakage of refrigerant is suppressed to the utmost, thereby preventing deterioration in the refrigeratability.