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WO/1993/025828A1 |
The invention concerns a piston for a four-stroke internal-combustion engine, in particular the engine of a motor vehicle, the piston having a front face (2) and a piston skirt (3) contiguous with the front face (2). The invention calls ...
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WO/1993/014325A1 |
A piston apparatus for use in a controlled deflection roll includes a rectilinear-shaped piston (10a) having at least one side seal (22a, 22a') extending longitudinally in a slot (12a, 12a') in each sidewall and an end seal (21) in each ...
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WO/1993/013342A1 |
The invention relates to a new method for producing a packing arrangement for a hydraulically operated apparatus. The method comprises the following steps: (a) producing a preshaped plastic piece of seal material; (b) compressing said pr...
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WO/1993/009366A1 |
An arrangement for sealing an intermediate space (4) between an outer housing (1) and an inner structure, especially in a steam turbine, with a tubular intermediate ring (3) as a sealing component, which is constructed and arranged to be...
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WO/1992/019893A1 |
A sealing device (10) is fitted in a groove (16) between a first (11) and a second machine component (12). If a hydraulic pressure is applied to the high-pressure side (H) of the sealing device (10) consisting of the sealing ring (17) an...
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WO/1992/002722A1 |
An engine (40) provided with a piston (2), a top ring (3) and a second ring (4) fitted together over the piston (2), defining members (9) and (10) fitted on the piston (2) for connecting the top ring (3) to the second ring (4) so as to f...
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WO/1992/001882A2 |
An apparatus includes a tilt piston (10) having a piston head (12). The piston head (12) is reciprocally disposed within a cylindrical bore (16) formed in a housing (14), the bore (16) being oriented along an axis. A seal (26) is mounted...
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WO/1991/014890A1 |
The upper, piston-side sealing region (10) on the piston rod (1) of a 2-stroke diesel engine is bounded by a metallic, multiple-part coarse stripper (12). This acts as a fire-retardant ring and surrounds the piston rod (1) without spring...
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WO/1991/014889A2 |
A piston assembly comprising a piston head, and a connecting rod one end of which is secured to the piston head so as to be pivoted relative to the piston head about a predetermined axis. The end of the connecting rod supports a cross-me...
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WO/1991/010826A1 |
The invention relates to a piston ring device for piston reciprocating machines, mainly for internal combustion engines, comprising split ring elements arranged by way of self-tensioning in a ring groove of the piston in built-in state a...
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WO/1990/006459A1 |
Piston rings are described which comprise a single ring (10) in a co-operating piston ring groove (11), the piston ring being planar, having a dished section, and a planform giving desired radial pressure distribution on a co-operating c...
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WO/1990/005256A1 |
A sealing apparatus for use in sealing a clearance between a cylinder (38) and a piston (50) without using a lubricating oil. An annular groove (66) is formed in the outer circumferential surface of the piston (50). First and second seal...
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WO/1990/000693A1 |
For sealing between two opposed surfaces of two machine elements (1, 2) a combination seal is provided to be fitted into an open groove (3) in one of the machine elements (2). The seal comprises an elastomeric expansion ring (4, 5) at th...
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WO/1989/012191A1 |
A sealing ring (4) comprises a sealing member (5) having a contact surface (17) for engagement with a surface (3) to be sealed and extending over at least 50 per cent of the axial extent (W) of the sealing ring (4), and an elastomeric en...
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WO/1989/008797A1 |
A dynamic seal or bearing interface having a surface comprising: a first interface area (24) which, as it wears, provides a first amount of surface roughness which provides asperity tip load support (at 28); and a second interface area (...
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WO/1989/004932A1 |
In a process for improving the sliding of alternating pistons of thermal engines while counteracting the tilting movement of said pistons, a pressure gradient is generated by the action of vibrating elastic means (1, 1a) resistant to the...
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WO/1989/001582A1 |
A seal assembly for use in an apparatus having coaxial reciprocally movable components includes a primary member (20) having a cylindrical sealing surface (23) and a helical secondary member (22) having a cylindrical contact edge (35). T...
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WO/1988/007129A1 |
High pressure reciprocator components for reciprocating machines particularly internal combustion engines, the components include a multiple ring, single groove, piston seal (54) having stacked ring elements (104) with top contraction ri...
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WO/1988/004003A1 |
The sealing ring arrangement described comprises a split or divided sealing ring provided with a square or rectangular cross-section, made from a friction-reducing material, said ring being arranged, by its greater radial portion, with a...
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WO/1988/000289A1 |
An improved design of compression piston ring (3) for use in internal combustion reciprocating engines, the piston ring (3) having a peripheral cylinder engaging surface (6) with an edge zone (7) adapted to face towards a combustion zone...
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WO/1987/005076A1 |
The piston engine consists of a cylinder block with at least one cylinder in which the piston, equipped with at least one piston ring and connected with the crankshaft, is arranged to move up and down. In order to take account, in the en...
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WO/1986/006810A1 |
An oil control ring for a piston in an i.c. engine comprising an expander ring (11) and two lamellar rails (31, 32) which scrape the oil from the cylinder wall. The expander ring (11) has two series of lugs (23, 24) arranged alternately ...
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WO/1986/005250A1 |
A spring expander (10) for oil control piston ring incorporates two spring mechanisms. One spring mechanism (11, 12a, 12b,) produces circumferentially directed hoop stress in the expander body when the expander body itself is contracted....
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WO/1985/002804A1 |
A composite piston structure (10) and a method of making same. A piston member (15), carrier member (16), and ceramic facing member (14) are formed, the piston member (15) being comprised of a material selected from plastic and metal hav...
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WO/1984/003082A1 |
A piston (10) is assembled with its correct piston rings (12) by the piston manufacturer before dispatch to an engine manufacturer or repairer. This is achieved by use of a piston ring retainer (14, 20, 22, 23, 29, 32, 37) which holds th...
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WO/1983/001811A1 |
The hydraulic jack comprises a casing (1) with a face cover (2) and a back cover (3) and a piston rod (4) moving in relation to each other, on which rod there are provided a sealing element (7) and at least two grooves to form a correspo...
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WO/1983/000539A1 |
A reciprocatory piston and cylinder machine particularly suitable for use as a vacuum pump includes a cylinder (17), a cylindrical piston (16) relatively slidably reciprocable within the cylinder (17), and means for substantially sealing...
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WO/1982/003678A1 |
A cryogenic refrigerator has a split seal (28) at the interface between a displacer (12) and cylinder (14). An expander ring (38) presses the seal ring (30) against the cylinder (14). The seal ring is also axially loaded against one face...
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WO/1981/002586A1 |
Method of cryogenically hardening and expanding an insert in an article. Particularly, gray iron piston ring insert (14) having an austenitic matrix is treated in a piston body (12) by impinging a cryogenic medium thereon. This changes t...
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WO/1981/000117A1 |
A sliding material which has enough abrasion resistance, baking resistance, scuffing resistance, and intimate adhesion properties to be suited for use as a sliding surface of a piston ring or a cylinder liner for internal combustion engi...
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WO/1980/002314A1 |
Inwardly biassed sealing (6) for a piston ring assembly (3), where one end (13) of the sealing ring (6) is provided with a narrow protruding part (14), and the other ring end (12) is provided with a gap (15) correspondingly shaped to acc...
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WO/1980/001710A1 |
A cylinder (10) and piston (14) device has a piston (14) with a circumferential fluid seal mounting band (17) near one of its ends, a step (19) defining a piston end portion (20) of smaller diameter than the band (17), and a snap-ring gr...
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WO/1980/000738A1 |
A piston (90) comprising hydrodynamic skirts (30) and crowns (20), pressure actuated sealing rings (70') of fixed excursion or balanced by hydrodynamic reactions, or no rings at all, stringent temperature control, ample oil on the cylind...
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WO/1979/000919A1 |
A seal (44, 46, 116) for a mechanism such as an engine compressor, expander, pump, or the like. The mechanism includes a housing (10, 100) defining an operating chamber (12, 102) and a piston (30, 104) is within the housing and mounted f...
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JP2024054217A |
An object of the present invention is to provide a composite hard chromium plating film with excellent wear resistance and a sliding member coated with the film. [Solution] A composite hard chromium plating film containing plate-like alu...
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JP7467699B2 |
A piston ring (4, 6) for use in a piston ring pack in an annular ring groove (3) in the sidewall of a piston (1) of a large two-stroke turbo-charged uniflow-scavenged crosshead internal combustion engine to seal against the pressure in a...
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JP2024049816A |
An object of the present invention is to suppress variations in winding diameter when manufacturing a helical coil. In a spiral wire manufacturing device 1, a support core 70 supports a spiral coil 90 obtained by bending a wire 2 supplie...
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JP2024049393A |
[Problem] A piston with sufficient breakage resistance for an internal combustion engine that uses hydrogen gas fuel. Provide a ring. [Solution] A piston ring used in an internal combustion engine that uses hydrogen gas fuel, The piston ...
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JP7463566B2 |
A wear ring for guidance of two machine components are arranged movably relative to one another along/around a movement axis, which is formed in one piece from a plastic or a reinforced plastic material and which is slit such that it has...
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JP7462123B1 |
The oil control ring is a three-piece oil control ring that includes a pair of side rails and a spacer expander placed between the pair of side rails. The spacer expander has a plurality of ears including a contact surface that comes int...
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JP2024040065A |
[Problem] A piston ring assembly jig that allows the abutment part of the piston ring to be accommodated in the ring groove when assembling the piston ring into the ring groove of the piston, and a piston ring assembly method using the j...
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JP2024038981A |
[Problem] In a spark ignition engine that uses hydrogen gas fuel, the outer circumferential shape of the compression ring is maintained and sealing performance is maintained even under environments that are unfavorable to wear on the out...
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JP7449398B2 |
A shaft mounting assembly includes an elongate shaft with an outer surface having a substantially circular cross-section and a cylinder having an inner surface defining a bore housing the shaft. A spring having a substantially circular d...
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JP2024034383A |
[Problem] To further improve fuel efficiency by reducing the sliding resistance of an oil ring. [Solution] A multi-piece type oil ring 70 that is installed on a piston of an internal combustion engine and has a ring body 72 having a rail...
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JP7445828B1 |
A piston ring base material having an abutment portion, and a film covering at least an outer peripheral surface of the piston ring base material, the heat resistance value of the film being 2.0×10-6~12.0×10-6m2.K/W piston ring.
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JP7445778B2 |
A piston ring includes a base body having an inner circumferential surface, first and second flank surfaces and an outer circumferential surface, wherein a first hard chromium layer with a crack network is applied to the outer circumfere...
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JP7431105B2 |
Provided is a compressor including a sliding material with the wear resistance improved. To solve this problem, a compressor (40) includes: a compression chamber (43) that is formed in a cylinder (41) and compresses gas; and a piston rin...
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JP2024505389A |
The present disclosure relates to a piston assembly that includes a piston having a circumferential groove and a ring groove insert within the circumferential groove of the piston. In particular, the ring groove insert is of a second mat...
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JP2024501366A |
The compressor (10) includes a stationary part (20), a part (30) that reciprocates along the main axis (X), and an axis line between the stationary part (20) and the reciprocating part (30). Between the stationary part (20) and the recip...
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JP7411171B2 |
To provide a piston for an internal combustion engine capable of further reducing a blow-by gas flow rate and the number of particles of discharged particles, allowing surface roughness of an anodic oxide film to the blow-by gas flow rat...
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