A piston for a compressor includes a bearing portion having a cylindrical shape to define a suction space into which refrigerant is accommodated therein, the bearing portion being provided with a bearing surface facing an inner circumferential surface of the cylinder, a head portion coupled to a front opening of the bearing portion and provided with a plurality of suction ports which communicate with the suction space, the head portion having a compression surface configured to face a compression space to compress the refrigerant in the compression space, and a flange portion coupled to a rear opening of the bearing portion and provided with a through-passage through which the refrigerant is introduced from a muffler unit to the suction space, the flange portion being coupled to a driving portion to transmit driving force to the piston. The bearing surface is subjected to a surface treatment to improve abrasion resistance.

The present disclosure provides a piston for an internal combustion engine, the piston having a piston body including a first bearing saddle defining a first axis and a second bearing saddle defining a second axis, the first axis being parallel to and spaced from the second axis. A bearing is also provided, the bearing having a first journal having a first body, longitudinal ends, and lateral edges, the first journal defining a first axis, the first journal disposed about approximately 180 degrees of the first axis and a second journal having a second body and defining a second axis, the second journal disposed about approximately 180 degrees of the second axis, the second journal operable to be positioned abutting one of the lateral edges of the first journal when the first and second journals are positioned with the piston.

The present disclosure provides a piston for an internal combustion engine, the piston having a piston body including a first bearing saddle defining a first axis and a second bearing saddle defining a second axis, the first axis being parallel to and spaced from the second axis. A bearing is also provided, the bearing having a first journal having a first body, longitudinal ends, and lateral edges, the first journal defining a first axis, the first journal disposed about approximately 180 degrees of the first axis and a second journal having a second body and defining a second axis, the second journal disposed about approximately 180 degrees of the second axis, the second journal operable to be positioned abutting one of the lateral edges of the first journal when the first and second journals are positioned with the piston.

Various implementations include a combustion engine piston, including a skirt in a counter-part and including a first contact area of the piston in the counter-part, a head which extends transverse to a central axis, and a ring carrier which comprises at least two lands and at least two grooves for receiving the rings, including a first land adjoining the head and a second land situated between the first land and the skirt, wherein the lands include at least one contact land having a diameter greater than a minimum diameter of the skirt to form a second contact area of the piston in the counter-part, and wherein at least one contact land comprises a friction-reducing surface coating, formed at least on a radial sector covering an angle of at least 30 degrees, and up to on a single sector covering an angle of 360 degrees.

Various implementations include a combustion engine piston, including a skirt in a counter-part and including a first contact area of the piston in the counter-part, a head which extends transverse to a central axis, and a ring carrier which comprises at least two lands and at least two grooves for receiving the rings, including a first land adjoining the head and a second land situated between the first land and the skirt, wherein the lands include at least one contact land having a diameter greater than a minimum diameter of the skirt to form a second contact area of the piston in the counter-part, and wherein at least one contact land comprises a friction-reducing surface coating, formed at least on a radial sector covering an angle of at least 30 degrees, and up to on a single sector covering an angle of 360 degrees.

A rolling piston installed between a piston and a cylinder includes: a plurality of balls, wherein the balls are connected end to end to form the rolling piston ring, and a quantity of the balls is no less than three; or comprising: a plurality of columns, wherein the columns are connected end to end to form the rolling piston ring, and a quantity of the balls is no less than three; or comprising: balls and columns, wherein the balls and the columns are connected end to end to form the rolling piston ring, and a total quantity of the balls and the columns is no less than three; wherein both the balls and the columns are extendable, and/or a recess on the piston for installing the rolling piston ring is extendable and a slide on the cylinder for installing the rolling piston ring is extendable.

A rolling piston installed between a piston and a cylinder includes: a plurality of balls, wherein the balls are connected end to end to form the rolling piston ring, and a quantity of the balls is no less than three; or comprising: a plurality of columns, wherein the columns are connected end to end to form the rolling piston ring, and a quantity of the balls is no less than three; or comprising: balls and columns, wherein the balls and the columns are connected end to end to form the rolling piston ring, and a total quantity of the balls and the columns is no less than three; wherein both the balls and the columns are extendable, and/or a recess on the piston for installing the rolling piston ring is extendable and a slide on the cylinder for installing the rolling piston ring is extendable.

A sliding member includes a base substrate and a coating layer formed on the base substrate. The coating layer includes a copper alloy part derived from a plurality of precipitation hardening copper alloy particles. The copper alloy parts are bonded to each other via interfaces between the copper alloy parts. The copper alloy part contains nickel and silicon as additive elements. The copper alloy part contains 2 to 5 percent by mass of nickel. A sliding member for an internal combustion engine includes the sliding member at a sliding part of the internal combustion engine.

A sliding member includes a base substrate and a coating layer formed on the base substrate. The coating layer includes a copper alloy part derived from a plurality of precipitation hardening copper alloy particles. The copper alloy parts are bonded to each other via interfaces between the copper alloy parts. The copper alloy part contains nickel and silicon as additive elements. The copper alloy part contains 2 to 5 percent by mass of nickel. A sliding member for an internal combustion engine includes the sliding member at a sliding part of the internal combustion engine.

A piston for an internal combustion engine has a plurality of recesses formed in a skirt including an upper, a lower, and a central portion. The recesses in the upper portion close to an upper boundary of the central portion have lower ends located upwardly at a given distance away from the upper boundary. The recesses in the central portion close to the upper boundary have upper ends located downwardly at the given distance away from the upper boundary. The recesses in the lower portion close to the lower boundary have upper ends located downwardly at the given distance away from the lower boundary. The recesses in the central portion closer to the lower boundary have lower ends located upwardly at the given distance away from the lower boundary. This enhances lubrication between the piston and an inner wall of a cylinder bore and reduces a friction loss of the piston.