US 6,615,487 B2Granted

Method for manufacturing valve timing adjusting apparatus

AssigneeDenso Corporation

InventorsKazutoshi Iwasaki, Masayasu Ushida, Sanemasa Kawabata, Yoshio Matsumoto

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Abstract

A base material of a peripheral wall and a vane rotor is formed by extrusion molding an aluminum alloy and cutting an extrusion molded article to the desired length. Further, the extrusion molded article can be molded with high accuracy by extracting the aluminum alloy after extrusion. Preferably, 6000 system of Al—Mg—Si is used as an aluminum alloy. The cutting process and polishing process are applied to the roughly molded base material to form the peripheral wall and the vane rotor. By varying the length to be cut, the volume of each retard hydraulic chamber and each advance hydraulic chamber are adjusted. When the volume of the hydraulic chambers are adjusted, the torque for relatively rotating and driving the vane rotor with respect to the housing member can be changed even pressure of working oil is the same.

Claims17

Dependent claims

A method for manufacturing a valve timing adjusting apparatus, said valve timing adjusting apparatus installed in a driving force transmitting system for transmitting a driving force from a driving shaft of an internal combustion engine to a driven shaft for opening and closing at least one of an intake valve and an exhaust valve, and adjusts the opening-closing timing of at least either one of the intake valve or the exhaust valve, said valve timing adjusting apparatus including:

a housing member rotating with said driving shaft, said housing member having a peripheral wall and side walls connected to said peripheral wall at axial both sides thereof, said peripheral wall and said side walls forming a housing chamber;
and
a vane member rotating together with said driven shaft, said vane member having a vane housed in said housing chamber, said vane member driven to rotate by a fluid pressure with respect to said housing member;
the method for manufacturing the valve timing adjusting apparatus comprising the steps of:
extrusion molding light metal to form an extrusion molded article of at least one of said peripheral wall and said vane member;
and
cutting said extrusion molded article to a desired length.

4 more elements

Dependencies are inferred from the claim text.