Engine having variable valve timing mechanism
AssigneeToyota Jidosha Kabushiki Kaisha
InventorToshiharu Noguchi
Life of this patent
Estimating the term…
Abstract
An engine includes a crankshaft, a camshaft being driven by the crankshaft for opening and closing intake valves, a variable valve timing mechanism (VVT) attached to one end of the camshaft, which applies torque to the camshaft so as to change the valve timing. The camshaft has an increased outside diameter at a portion adjacent to the VVT as compared to other portions that are more distant from the VVT.
Claims19
An engine comprising:
- a valve;
- a crankshaft,
- a camshaft driven by the crankshaft for selectively opening and closing said valve;
- and
- a valve timing control apparatus, which applies torque to the camshaft to change the valve timing, attached to a proximal end of the camshaft, wherein the camshaft is supported at the proximal end by a proximal end journal, and wherein the camshaft has a distal section, which is distal of the proximal end journal, wherein at least one cam is located on the distal section, and wherein the distal section has an outside diameter at a portion remote from the valve timing control apparatus that is less than the outside diameters of other portions of the distal section that are closer to the valve timing control apparatus.
A camshaft for use in an engine provided with a valve timing control apparatus for changing the valve timing of at least one of an intake valve and an exhaust valve, wherein the control apparatus is attached to a proximal end of the camshaft, wherein the camshaft is supported at the proximal end by a proximal end journal, the camshaft comprising:
- a distal section that is distal of the proximal end journal, wherein at least one cam is located on the distal section, and wherein the distal section has an outside diameter at a portion remote from the valve timing control apparatus that is less than the outside diameters of other portions of the distal section that are closer to the valve timing control apparatus.
An engine comprising:
- a plurality of valves;
- a crankshaft;
- a camshaft driven by the crankshaft for selectively opening and closing said valves, wherein the camshaft has a proximal end, a distal end, a plurality of cams for actuating the valves, and a plurality of journals including end journals located at the distal and proximal ends, respectively;
- and
- a valve timing control apparatus, which applies torque to the camshaft to change the valve timing, attached to the proximal end of the camshaft, wherein the camshaft is supported at the proximal end by the proximal end journal, and wherein the camshaft has a distal section, which is distal of the proximal end journal, wherein the cams are located on the distal section, and wherein the distal section has an outside diameter at a portion remote from the valve timing control apparatus that is less than the outside diameters of other portions of the distal section that are closer to the valve timing control apparatus.
Dependencies are inferred from the claim text.