Abrégé

A rotary positive displacement pump (1) comprises a pump enclosure (10) and at least one rotating member (20). The pump enclosure (10) has an inlet (12) and an outlet (14). The rotating member (20) is arranged for, when being rotated, causing a transfer of a liquid from the inlet (12) to the outlet (14). The rotary positive displacement pump (1) has internal sliding surfaces (16, 24, 26, 32, 34) that during operation are exposed to the liquid and are exposed to a sliding contact relative to other internal sliding surfaces (16, 24, 26, 32, 34) of the rotary positive displacement pump (1). At least a part of the internal sliding surfaces (16, 24, 26, 32, 34) has a surface region composed by a nitrided or nitrocarburized steel intercalated with a solid lubricant. A method for manufacturing a rotary positive displacement pump is also disclosed.

Classes IPC  ?

• C23C 8/26 - Nitruration de la couche superficielle de matériaux ferreux
• C23C 8/32 - Carbo-nitruration de la couche superficielle de matériaux ferreux
• C23C 8/56 - Carbo-nitruration de la couche superficielle de matériaux ferreux
• C23C 8/72 - Traitement par plusieurs éléments en une seule étape
• F04C 2/00 - Machines ou pompes à piston rotatif

Abrégé

A method for manufacturing of steel articles comprises nitriding (210) a steel article at a nitrification temperature in the interval 350-650°C, giving a nitrided steel article. The nitrided steel article is quenched (220) in a reactive quenching oil from the nitrification temperature. The reactive quenching oil comprises at least one of S, P, B, Mo and W. Thereby, the quenching additionally comprises coating (222) of the nitrided steel article by a solid lubricant comprising at least one of S, P, B, Mo and W. An apparatus for manufacturing of steel articles, a quenching oil and a steel article produced by the method are also disclosed.

Classes IPC  ?

• C21D 1/58 - Huiles
• C23C 8/26 - Nitruration de la couche superficielle de matériaux ferreux

Abrégé

A tool ( 1) for mechanochemical treatment comprises a shaft ( 10), a number n of working ledges (20), n≥ 1, and a force application arrangement (2). The force application arrangement (2) is configured for applying a working force (F) on the working ledges (20). The working ledges (20) comprises wear-resistant material with a Vickers number above 800HV and a Young modulus above 200GPa. Each working ledge (20) has a contact surface (22) facing away from a main axis ( 1 1) and having a surface roughness Ra below Ιμπι. The contact surface (22) has a convex curvature which has a radius of curvature that is at most equal to a closest distance from that point to the main axis. A width of the contact surface (22) is less than r/2n. The working force applied on each working ledge (20) is at least P-L-r/2n, where P= 107 Pa and L is the contact surface length.

Classes IPC  ?

• B24B 33/02 - Machines ou dispositifs de finissageAccessoires à cet effet pour travailler intérieurement des surfaces de révolution, p. ex. de forme cylindrique ou conique
• B24B 33/08 - Outils de finissage
• B24B 33/10 - Organes annexes

Abrégé

The present invention relates to a method for the lining of a thin-walled sliding element (20) for internal combustion engine blocks ion which: (i) the pressure applied for honing the sliding element (20) is between 8 MPa and 9 MPa; and (ii) at least a part of the inner surface (21) of the sliding element (20) comprises a nano-coat of solid lubricant provided with roughnesses, before honing, of Rpk, Rk and Rvk no lower than 2/3 of the original.

Classes IPC  ?

• F16J 10/04 - Surfaces de contactChemises de cylindres
• B24B 1/00 - Procédés de meulage ou de polissageUtilisation d'équipements auxiliaires en relation avec ces procédés
• C23C 26/00 - Revêtements non prévus par les groupes

Abrégé

A sliding set is described for use in an internal combustion engine, the sliding set having at least a liner or cylinder of an engine block (1) which defines an internal sliding surface (2) and at least a piston ring (3) substantially shaped as a ring which defines an external sliding surface (4) which cooperates with the internal sliding surface (2) of the cylinder liner/bore (1), wherein : • (i) at least part of the external sliding surface (4) of the ring (3) has ceramic material coating; and • (ii) at least part of the internal sliding surface (2) of the liner/ cylinder (1) comprises a solid lubricant nanolayer coating wherein 0-5 < Rpk + Rvk + Rk < 1.5 and/or formula (I).

Classes IPC  ?

• F16J 9/26 - Segments de piston, leurs logementsSegments d'étanchéité de structure similaire en général caractérisés par l'emploi de matériaux particuliers

Abrégé

A manufacturing method for providing a low-friction surface comprises providing (210) of a mechanical element. A tool is mechanically rubbed (212) against a surface of the mechanical element. A process liquid is provided (214) to a contact area between the mechanical element and the tool. The process liquid comprises a first element that is a refractory metal and a second element that is a chalcogen. The first and second elements are provided in a liquid substance. The mechanical rubbing is performed with a contact pressure that is between 1% and 100% of an ultimate strength of the mechanical element. The mechanical rubbing thereby causes a combined burnishing of the surface of the mechanical element and a deposition of a tribofilm on the surface of the mechanical element. The tribofilm comprises the first element and the second element.

Classes IPC  ?

• C23C 26/00 - Revêtements non prévus par les groupes
• C10M 103/00 - Compositions lubrifiantes caractérisées en ce que le matériau de base est un matériau inorganique
• C10M 177/00 - Méthodes particulières de préparation des compositions lubrifiantesModification chimique par post-traitement des constituants ou de la composition lubrifiante elle-même, non couverte par d'autres classes
• C23C 30/00 - Revêtement avec des matériaux métalliques, caractérisé uniquement par la composition du matériau métallique, c.-à-d. non caractérisé par le procédé de revêtement
• F16J 10/04 - Surfaces de contactChemises de cylindres
• C10N 40/25 - Moteurs à combustion interne

Abrégé

A manufacturing method of mechanical elements comprises providing (210) of a mechanical element having a rough curved surface preferably with a surface roughness of more than Sa = 0.1 μm. The method is characterized by tribochemically depositing (214) solid lubricant substance directly onto the rough curved surface in transverse directions. A mechanical element has a curved surface. The curved surface has a surface layer of a tribochemically deposited solid lubricant substance. The mechanical element is obtainable by the above method. A tool for manufacturing of such a mechanical element comprises a support portion, at least one tool working surface, means for providing a force pressing the tool towards the curved surface and driving means for moving said at least one tool working surface in two different directions along said curved surface. The working surface comprises an oxide, carbide and/or suicide of an element capable of forming a stable sulfide.

Classes IPC  ?

• C23C 26/00 - Revêtements non prévus par les groupes
• C23C 24/02 - Revêtement à partir de poudres inorganiques en utilisant uniquement une pression
• C23C 24/06 - Compression du matériau en poudre, p. ex. par laminage
• B24B 1/00 - Procédés de meulage ou de polissageUtilisation d'équipements auxiliaires en relation avec ces procédés
• B24B 33/08 - Outils de finissage
• F02F 1/20 - Autres cylindres caractérisés par des particularités de structures en vue de la lubrification