Valves and valve actuation – Valve
Patent
1980-11-26
1982-08-31
Chambers, A. Michael
Valves and valve actuation
Valve
123188AA, F01L 300
Patent
active
043468705
ABSTRACT:
Thermal barriers (10, 26) fixed to mushroomed heads (12, 28) of poppet valves intended for diesel engines are disclosed. Thermal barrier (10) includes an insulating material (18) bonded to a face portion (12a) of mushroom head (12), a sheet metal shield (20) covering the insulating material, and a flange (22) clamped over the outer periphery of the shield and welded to the valve head. Thermal barrier (26) includes an insulating material encapsulated in a sheet metal sheath defining an evacuated chamber (32) which covers a face portion (28a) of the mushroom head (28), a sheet metal shield (30), and a flange portion (28b) integrally formed with the mushroom head and spun over the shield during final assembly to clamp the shield over the encapsulated insulating material. The flanges in both embodiments make line contact with the shield to minimize heat flow from the shields to the flanges and hence to the valve head.
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Chute Richard
Larson Jay M.
Tunnecliffe Theodore N.
Worthen Roger P.
Chambers A. Michael
Eaton Corporation
Grace C. H.
Sajovec F. M.
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