Patent ID: 7207302
Filing Date: 2007-04-24
Classification: F01L,Y10T

Abstract:
1. A valve lifter body that is generally cylindrical about an axis and provided with a first end and a second end, comprising: a) an outer surface that encloses a first cavity and a second cavity; b) the first end of the valve lifter body includes a first opening shaped to accept a roller; c) the first cavity includes a first inner surface that is provided with a first wall, a second wall, a third wall, a fourth wall, a first angled wall, a second angled wall, a third angled wall, fourth angled wall, a first curved surface, a second curved surface, and a flat surface; d) the first wall and the second wall extend axially into the valve lifter body from the first opening and are positioned so that the first wall faces the second wall; e) the third wall extends axially into the valve lifter body from the first opening and terminates, at least in part, at the second curved surface; f) the fourth wall extends axially into the valve lifter body from the first opening and terminates, at least in part, at the first curved surface; g) the third wall and the fourth wall are positioned so that the third wall faces the fourth wall; h) the first angled wall extends axially into the valve lifter body from the first opening, faces the second angled wall, and is located between the fourth wall and the first wall; i) the second angled wall extends axially into the valve lifter body from the first opening, faces the first angled wall, and is located between the second wall and the third wall; j) the third angled wall extends axially into the valve lifter body from the first opening, faces the fourth angled wall, and is located between the second wall and the fourth wall; k) the fourth angled wall extends axially into the valve lifter body from the first opening, faces the third angled wall, and is located between the first wall and the third wall; l) the first and second curved surfaces arc, at least in part, located adjacent to the flat surface, which is generally orthogonal to the axis of the valve lifter body; m) the second end of the valve lifter body includes a second opening; n) the second cavity extends axially into the valve lifter body from the second opening and includes a second inner surface that is provided with a plurality of cylindrical surfaces and configured to accommodate a socket body and a leakdown plunger; and o) the first cavity is fabricated, at least in part, through cold forming.