Expansible chamber devices – Piston – Open-ended hollow skirt type
Patent
1985-04-04
1987-03-17
Lazarus, Ira S.
Expansible chamber devices
Piston
Open-ended hollow skirt type
92213, 92224, 92248, 123669, 123193P, F16J 101
Patent
active
046498060
ABSTRACT:
An integrally cast composite piston assembly is disclosed which is effective to carry a ceramic plate in an iron based cap. The assembly comprises a cylindrical piston body, preferably of aluminum, having a crown top, an annular crown side wall with an upper edge, and an annular undercut surface terminating the crown side wall. The undercut surface must make an angle with a plane extending perpendicular to the axis of the piston, the angle being substantially equal to the arc tangent of H/R where H is the median distance of the undercut surface from the plane and R is the median radius of the undercut surface from the axis of the piston. The assembly further comprises the cylindrical iron-based cap disposed on the piston body crown top and having a cap side wall depending about the crown side wall, the cap side wall having an annular lip extending radially inwardly from the cap side wall, the lip having a surface mateable with the undercut surface of the piston body so that there exists a tightly stressed camming relationship between the mateable surfaces as a result of the shrinkage of the piston body upon solidification.
REFERENCES:
patent: 3075817 (1963-01-01), Mayes
patent: 4306489 (1981-12-01), Driver et al.
patent: 4404935 (1983-09-01), Kraft
patent: 4419925 (1983-12-01), Tsuzuki et al.
patent: 4506593 (1985-03-01), Sugiyama et al.
patent: 4524498 (1985-06-01), Hartsock
patent: 4530341 (1985-07-01), Palm
patent: 4535683 (1985-08-01), Dworak et al.
Ford Motor Company
Lazarus Ira S.
Malleck Joseph W.
May Roger L.
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