| 摘要 |
The piston pin (4) comprises a diamond like carbon surface coating with low coefficient of friction, and textured surface (9, 10) arranged on the surface of the revolution of the piston pin. The piston pin cooperates with a connecting rod bearing fitted to a crankshaft of a combustion engine. The textured surface comprises axially parallel grooves that extend around a periphery of the surface of revolution of the piston pin and forms a drainage channel with a lubricant. The groove is formed with a thread (12) extending helically to a coil. The piston pin (4) comprises a diamond like carbon surface coating with low coefficient of friction, and textured surface (9, 10) arranged on the surface of the revolution of the piston pin. The piston pin cooperates with a connecting rod bearing fitted to a crankshaft of a combustion engine. The textured surface comprises axially parallel grooves that extend around a periphery of the surface of revolution of the piston pin and forms a drainage channel with a lubricant. The groove is formed with a thread (12) extending helically to a coil, which is formed around the surface of the surface of revolution of the piston pin. The axially parallel grooves are distributed along the axial extension of the piston pin. The textured surface further comprises: a single helical thread; two helical threads in same rotational direction; two helical threads in alternate direction of rotation; elliptical thread that is axially arched; and sets of streaks (11) with two intersecting streaks (13, 14) that are geometrically distributed around the surface of revolution of the piston pin. Each set of streaks associates a first streak and a second concurrent streak. The first streak is formed on the surface of revolution of the piston pin and is distributed by group of first streaks aligned along a generatrix of revolution of the axis of piston. The second streak is formed on the surface of the revolution of the piston pin and is distributed by group of the second streak aligned along the circumference of the piston pin. An axially central friction area of the surface of the revolution of the piston pin is reserved in contact with the piston pin of the connecting rod bearing, and is provided with a texture combined with the grooves and sets of streaks that are distributed between the coils consecutive to the grooves. The grooves extend axially on either side of the fiction area. Independent claims are included for: (1) a process for texturing the surface of the piston pin; and (2) a machine for texturing a surface, by a laser beam, of a piston pin. |
