摘要:
An exemplary piston includes a piston body (102) having radially inner and outer body mating surfaces. The piston further includes a cooling gallery ring (104) cooperating with the piston body (102) to form a continuous upper combustion bowl surface and a cooling gallery. The cooling gallery ring (104) has radially inner and outer ring mating surfaces abutted along their corresponding radially inner and outer body mating surfaces, such that the cooling gallery is substantially enclosed. The piston body (102) and cooling gallery ring (104) is joined together along the radially inner and radially outer interface regions to form a generally one- piece piston assembly. The radially outer interface region may be elongated in a direction parallel to the piston axis, is facilitating a laser welding joining process.
摘要:
A piston for an internal combustion engine including a piston crown having an upper surface and a lower surface; a piston skirt; and a generally cup-shaped undercrown formed on the lower surface of the piston crown and integral with the top portions of opposing side walls of the piston skirt, at least a portion of the surface of the undercrown being rough, defining at least one region of increased surface area, wherein the distance between an uppermost and lowermost points of the surface of the undercrown in the at least one region of increased surface area is in the range of approximately 0.1mm to 1.0mm.
摘要:
A piston including a piston crown, the piston crown having a combustion surface that further defines a combustion bowl rim area and a bowl root area. A thermal spray coating is applied to the bowl rim and/or the bowl root area of the piston to increase the resistance of the piston to thermal mechanical fatigue. The thermal spray coating may be metal or alloy based and may be applied using any suitable process.
摘要:
Exemplary piston assemblies and methods of making the same are disclosed. An exemplary piston assembly may include a piston crown and a piston skirt that is received in a central opening of the crown. The piston crown may include a ring belt portion defining, at least in part, a cooling gallery. The crown and skirt may each further include corresponding mating surfaces that extend about a periphery of the crown and skirt. The skirt mating surface and crown mating surface may generally be secured to each other that the crown and the skirt cooperate to form a continuous upper combustion bowl surface. The skirt and crown may cooperate to define a radially outer gap about a periphery of the piston crown.
摘要:
Exemplary pistons are disclosed, e.g., for an internal combustion engine. An exemplary piston includes a lower part and an upper part, whereby the lower part and the upper part define a circumferential closed cooling gallery. The cooling gallery may be provided with a gallery bottom. The piston may further include a circumferential bar positioned on the gallery bottom, the circumferential bar defining at least one coolant inlet and at least one coolant outlet extending through the bar.