Abstract Herein disclosed is a three-layered apex sealing member for use with an internal combustion engine of rotary type. The apex sealing member is made of cast iron but composed of an upper portion having a chilled structure and formed with a sliding top surface for sliding engagement with the inner peripheral surface of the engine housing, of a lower portion having a chilled structure to be operatively received within the apex seal groove, and of an intermediate portion left unchilled and sandwitched between the upper and lower chilled portions. With these construction arrangement, thermally deforming forces to be exerted on the interfaces between each pair of the chilled and unchilled layers are oppositely directed and accordingly offset, so that an undesirable deformation of the sealing member is substantially eliminated.
An apex sealing member for use with a rotary piston engine, comprising an elongated body of cast iron to be operatively received within an apex seal groove which is formed in each apex portion of a multi-lobed rotor of the engine, said elongated body including an upper portion having a chilled structure and formed with a sliding top surface for sliding engagement with the inner peripheral surface of the engine housing, a lower portion having a chilled structure to be received within the apex seal groove, and an intermediate portion left unchilled and sandwiched between said upper and lower portions.
Claim 2
Dependent Claim
100 words
An apex sealing member for use with a rotary piston engine, comprising an elongated body of cast iron to be operatively received within an apex seal groove which is formed in each apex portion of a multi-lobed rotor of the engine, said elongated body including an upper portion having a chilled structure and formed with a sliding top surface for sliding engagement with the inner peripheral surface of the engine housing, a lower portion having a chilled structure to be received within the apex seal groove, and an intermediate portion left unchilled and sandwiched between said upper and lower portions.
Claim 3
Dependent Claim
23 words
An apex sealing member according to claim 1, wherein the thickness of said upper portion is larger than that of said lower portion.
Claim 4
Dependent Claim
27 words
An apex sealing member according to claim 1, wherein the thickness of said intermediate portion is at least one-fifth of the whole thickness of said elongated body.