摘要:
An Al alloy poppet valve (1) is used in an internal combustion engine and has a valve head (1a) and a valve stem (1b). At least the valve head is made of non-heat-treatable Al alloy (2) in which ceramic particles (3) such as oxide and carbide are uniformly dispersed, thereby increasing wear resistance and durability.
摘要:
In a tappet in use for an internal combustion engine, a shim (10) is provided on an upper wall (7) of a tappet body (6) and has a chamfer (106) in the lower circumferential edge of the shim (10). The shim (10) is not engaged on a curved portion of a corner (12) between the side wall (8) and the upper wall (7) of the tappet body (6). Thus, the shim (10) is fitted on the upper wall (7) of the tappet body without a clearance groove, thereby increasing strength and durability.
摘要:
A poppet valve (1) in an internal combustion engine comprises a valve head (2) and a valve stem. On a valve face (2a) of the valve head (2), a hardened layer (5) of dendrites in which crystals are directed from the inside to the surface is formed, thereby increasing wear resistance of the valve face without cladding.
摘要:
There is provided an internal combustion engine valve having a body, a head, and a contact surface disposed on said head adapted to periodically enter into gas-sealing engagement with a valve seat, said contact surface being formed in metal deposit welded to said valve head, the composition of said metal deposit being A1 and B free, and measured at said contact surface, consisting essentially of carbon : 1.3 to 2.0 weight percent; chromium: 19 to 23 weight percent ; molybdenum: 8 to 11 weight percent ; nickel: 17 to 21 weight percent ; manganese: 6 to 13 weight percent ; silicon: less than 0.5 weight percent ; oxygen: less than 0.06 weight percent ; balancing iron and inevitable impurities.
摘要:
There is provided an internal combustion engine valve having a body, a head, and a contact surface disposed on said head adapted to periodically enter into gas-sealing engagement with a valve seat, said contact surface being formed in metal deposit welded to said valve head, the composition of said metal deposit being A1 and B free, and measured at said contact surface, consisting essentially of carbon : 1.3 to 2.0 weight percent; chromium: 19 to 23 weight percent ; molybdenum: 8 to 11 weight percent ; nickel: 17 to 21 weight percent ; manganese: 6 to 13 weight percent ; silicon: less than 0.5 weight percent ; oxygen: less than 0.06 weight percent ; balancing iron and inevitable impurities.
摘要:
An Al alloy poppet valve is used in an internal combustion engine and has a valve head and a valve stem. At least the valve head is made of non-heat-treatable Al alloy in which ceramic particles such as oxide and carbide are uniformly dispersed, thereby increasing wear resistance and durability.
摘要:
There is provided a structure of a shim to be inserted in a clearance provided between a cam and a tappet in a moving valve mechanism of an internal combustion engine, wherein a volmeric density of the shim body is changed such that it is maximized at an upper surface of the shim, at which the shim is in contact with the cam when a compression load or shock from the cam is applied to the shim, and the density is gradually decreased from the maximized portion to a lower or peripheral portions.