Valve system for internal combustion engine

A valve system for an internal combustion engine comprising a valve seat and a valve member to be assembled with the valve seat,

• said valve seat having a base member including a matrix of iron-base sintered alloy and a dispersed Si—Cr—Mo—Co group intermetallic compound powder, said intermetallic compound powder having a hardness of Hv600 to Hv1000 and an average particle diameter of 20 to 70 μm, said matrix being contained at 10 to 50 mass % with reference to total mass of the base member, and
• said valve member having a base member including a matrix of austenitic steel and a padding layer formed to a valve face of the base member, said padding layer being formed of satellite group cobalt-base alloy having a hardness of more than Hv400 and a thickness of more than 0.5 mm.

A valve system for an internal combustion engine comprising a valve seat and a valve member to be assembled with the valve seat,

• said valve seat having a base member including a matrix of iron-base sintered alloy and a dispersed Si—Cr—Mo—Co group intermetallic compound powder, said intermetallic compound powder having a hardness of Hv600 to Hv1000 and an average particle diameter of 20 to 70 μm, said matrix being contained at 10 to 50 mass % with reference to total mass of the base member, and
• said valve member having a base member including a matrix of austenitic steel and a padding layer formed to a valve face of the base member, said padding layer being formed of Si—Cr—Mo—Co group intermetallic compound having a hardness of more than Hv400 and a thickness of more than 0.5 mm.

A valve arrangement for an internal combustion engine including in combination of an intake side valve system and an exhaust side valve system,

• said intake side valve system comprising a valve seat and a valve member to be assembled with the valve seat,
• said valve seat having a base member including a matrix of iron-base sintered alloy and a dispersed Si—Cr—Mo—Co group intermetallic compound powder, said intermetallic compound powder having a hardness of Hv600 to Hv1000 and an average particle diameter of 20 to 70 μm, said matrix being contained at 10 to 50 mass % with reference to total mass of the base member,
• said valve member having a base member including a matrix of martensitic steel and a nitriding diffusion layer formed to a valve face of the base member, said nitriding diffusion layer having a hardness of more than Gus Hv500 and a thickness of more than 20 μm.

A valve arrangement for an internal combustion engine including in combination of an intake side valve system and an exhaust side valve system,

• said exhaust side valve system comprising a valve seat and a valve member to be assembled with the valve seat,
• said valve seat having a base member including a matrix of iron-base sintered alloy and a dispersed Si—Cr—Mo—Co group intermetallic compound powder, said intermetallic compound powder having a hardness of Hv600 to Hv1000 and an average particle diameter of 20 to 70 μm, said matrix being contained at 10 to 50 mass % with reference to total mass of the base member,
• said valve member having a base member including a matrix of austenitic steel and a padding layer formed to a valve face of the base member, said padding layer being formed of satellite group cobalt-base alloy having a hardness of more than Hv400 and a thickness of more than 0.5 mm.

A valve arrangement for an internal combustion engine including in combination of an intake side valve system and an exhaust side valve system,

• said exhaust side valve system comprising a valve seat and a valve member to be assembled with the valve seat,
• said valve seat having a base member including a matrix of iron-base sintered alloy and a dispersed Si—Cr—Mo—Co group intermetallic compound powder, said intermetallic compound powder having a hardness of Hv600 to Hv1000 and an average particle diameter of 20 to 70 μm, said matrix being contained at 10 to 50 mass % with reference to total mass of the base member,
• said valve member having a base member including a matrix of austenitic steel and a padding layer formed to a valve face of the base member, said padding layer being formed of Si—Cr—Mo—Co group intermetallic compound having a hardness of more than Hv400 and a thickness of more than 0.5 mm.