Heat treatment method for cam piece
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHiroki Tateishi
Life of this patent
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Abstract
Provided is a heat treatment method for a cam piece, and the cam piece has an insertion hole into which a cam shaft is inserted, a base portion configuring a base circle of a cam, and a nose portion configuring a cam ridge. The heat treatment method for the cam piece includes: a first step of using a jig formed into a shape having a cavity, the jig being inserted into the insertion hole such that the cavity is located between an inner circumferential surface of the nose portion of the cam piece and a central axis of the jig; and a second step of heating the cam piece from an outer circumferential surface side by high-frequency induction heating in a state in which the jig is inserted in the insertion hole of the cam piece.
Claims10
A heat treatment method for a cam piece, the cam piece configuring an assembly-type cam shaft, the cam piece including an insertion hole into which a shaft configuring the assembly-type cam shaft is inserted, a base portion configuring a base circle of a cam, and a nose portion having a greater wall thickness from the insertion hole to an outer circumferential surface than that of the base portion, the nose portion configuring a cam ridge, the heat treatment method comprising:
- a first step of using a jig formed into a shape having a cavity inside a cylinder of the jig, the cavity being located between a central axis and the outer circumferential surface, the jig being inserted into the insertion hole of the cam piece in such a manner that the cavity is located between an inner circumferential surface in the nose portion of the cam piece and the central axis of the jig, and the jig comes into contact with the inner circumferential surface that defines the insertion hole;
- and
- a second step of heating the cam piece from the outer circumferential surface by high-frequency induction heating in a state in which the jig is inserted in the insertion hole of the cam piece.
A heat treatment method for a cam piece, the cam piece configuring an assembly-type cam shaft, the cam piece including an insertion hole into which a shaft configuring the assembly-type cam shaft is inserted, a base portion configuring a base circle of a cam, and a nose portion having a greater wall thickness from the insertion hole to an outer circumferential surface than that of the base portion, the nose portion configuring a cam ridge, the heat treatment method comprising:
- a first step of using a jig formed into a shape having a cutout recessed radially inward at a part of a cylinder of the jig, the jig being inserted into the insertion hole of the cam piece in such a manner that an inner circumferential surface in the nose portion of the cam piece faces the cutout of the jig, and the jig comes into contact with the inner circumferential surface that defines the insertion hole;
- and
- a second step of heating the cam piece from the outer circumferential surface by high-frequency induction heating in a state in which the jig is inserted in the insertion hole of the cam piece.
Dependencies are inferred from the claim text.