Camshaft device and method for manufacturing camshaft device

A camshaft device comprising:

• a main shaft elongated in a lengthwise direction thereof
• at least one cam lobe assembled to the main shaft and eccentrically
• formed with respect to a rotation axis of the main shaft;
• at least one journal bearing assembled to the main shaft and provided to rotatably support the main shaft;
• and
• at least one guide shaft assembled to the main shaft and installed between the cam lobe and another neighboring cam lobe so as to align assembled positions of the cam lobe and the journal bearing wherein the journal bearing comprises:
• an inner diameter part formed of at least one material selected from among an Al—Si alloy component, an aluminum component, a glass fiber component, a polymer component, a polymer composite material component, a magnesium component, a titanium component, a steel component, and combinations thereof;
• and
• an outer diameter part installed in an outer diameter direction of the inner diameter part and formed of at least one dedicated bearing material selected from among a white metal component, a babbit metal component, a phosphor bronze component, a lead bronze component, a kelmet component, a zinc bronze component, an Al—Si alloy component, an Al—Sn alloy component, and combinations thereof.

A camshaft device comprising:

• a main shaft elongated in a lengthwise direction thereof;
• at least one cam lobe assembled to the main shaft and eccentrically formed with respect to a rotation axis of the main shaft;
• at least one journal bearing assembled to the main shaft and provided to rotatably support the main shaft;
• and
• at least one guide shaft assembled to the main shaft and installed between the cam lobe and another neighboring cam lobe so as to align assembled positions of the cam lobe and the journal bearing wherein the guide shaft is provided formed of at least one selected from among an extruded article, a casting, or an injection molded article, which is formed of at least one material selected from among an Al—Si alloy component, a magnesium (Mg), a glass fiber component, a polymer component, or combinations thereof.

A method for manufacturing a camshaft, the method comprising:

• preparing a main shaft formed lengthily in the lengthwise direction thereof;
• preparing at least one cam lobe assembled to the main shaft and eccentrically formed with respect to a rotation axis of the main shaft;
• preparing at least one journal bearing assembled to the main shaft and provided to rotatably support the main shaft;
• preparing at least one guide shaft so as to align the assembled position of the cam lobe or the journal bearing;
• and
• assembling, to the main shaft, the cam lobe, the journal bearing, a second cam lobe and the guide shaft in order, wherein the main shaft comprises:
• a hollow hole formed on an inner portion thereof so as to have a reduced weight;
• and
• a polygonal surface formed on an outer portion thereof corresponding to a direction of an eccentric axis of the cam lobe,
• wherein the guide shaft comprises:
• a polygonal hole formed on an inner portion thereof corresponding to the polygonal surface of the main shaft;
• and
• a guide surface formed on an outer portion thereof, and
• wherein the guide shaft comprises:
• a plurality of blade parts constituting the polygonal hole;
• and
• a bridge part configured to connect the blade part and another neighboring blade part.