Piston and method of construction thereof

摘要

A piston and method of construction are provided. The piston has a piston body with an insert forming at least a portion of an upper combustion surface. The piston body is constructed from a first material having a first thermal conductivity and the insert is constructed from a second material having a second thermal conductivity. The first thermal conductivity is less than the second thermal conductivity. The piston body has an upper crown and a pair of pin bosses depending from the upper crown with the pin bosses presenting pin bores aligned with one another along a pin bore axis. The upper crown includes a recess in which the insert is fixed.

主权项

1. A piston for an internal combustion engine, comprising:
a piston body formed from a first material having a first thermal conductivity and having a pair of pin bosses depending from an upper crown with pin bores aligned with one another along a pin bore axis, said upper crown having a recess, said piston body having a pair of skirt portions diametrically opposite one another, said skirt portions being joined to said pin bosses via strut portions; an insert formed from a second material separate from said first material, said second material having a second thermal conductivity that is higher than said first conductivity, said insert being fixed in said recess and forming at least part of an upper combustion surface; and further comprising a plurality of webs formed as a monolithic piece of said first material with said piston body, said plurality of webs extending across said recess in abutment with said insert, said plurality of webs including a first pair of webs extending generally parallel with one another and with said pin bore axis and a second pair of webs extending generally transversely to said first pair of webs and intersecting said first pair of webs, said second pair of webs extending upwardly as an extension of said struts, said insert being fixed to a generally planar surface of said first and second webs.