Internal combustion engine with variable valve opening characteristics

摘要

An internal combustion engine with variable valve opening characteristics includes an outer camshaft, an inner camshaft, an urging device, a cam phase changing device, and a locking device. The outer camshaft includes a first cam. The inner camshaft includes a second cam. The cam phase changing device includes a first rotating member, a second rotating member, an advance-angle-side oil hydraulic chamber, and a retard-angle-side oil hydraulic chamber. A cam phase of the one of the outer camshaft and the inner camshaft is changed by switching between oil hydraulic circuits that communicate with the advance-angle-side oil hydraulic chamber and the retard-angle-side oil hydraulic chamber. The locking device is provided to connect another of the outer camshaft and the inner camshaft to the first rotating member with a predetermined cam phase.

主权项

1. An internal combustion engine with variable valve opening characteristics, comprising:
an outer camshaft including a first cam provided on an outer circumference of the outer camshaft to open and close a valve; an inner camshaft provided inside the outer camshaft to be rotatable relative to the outer camshaft and including a second cam provided on the outer circumference of the outer camshaft to open and close the valve, the second cam being rotatable integrally with the inner camshaft and being rotatable relative to the first cam; an urging device provided between the outer camshaft and the inner camshaft to apply a relative rotational force to the outer camshaft and the inner camshaft; a cam phase changing device comprising:
a first rotating member rotatable in synchronization with a crankshaft;a second rotating member rotatable integrally with one of the outer camshaft and the inner camshaft and rotatably connected to the first rotating member;an advance-angle-side oil hydraulic chamber provided between the first rotating member and the second rotating member; anda retard-angle-side oil hydraulic chamber provided between the first rotating member and the second rotating member, a cam phase of said one of the outer camshaft and the inner camshaft being changed by switching between oil hydraulic circuits that communicate with the advance-angle-side oil hydraulic chamber and the retard-angle-side oil hydraulic chamber; a locking device provided to connect another of the outer camshaft and the inner camshaft to the first rotating member with a predetermined cam phase; and a cam holder is provided that rotatably supports the outer camshaft and is provided adjacent to the cam phase changing device, wherein the urging device is provided between the cam phase changing device and the first cam which is a cam that is closest to the cam phase changing device of all cams provided on the outer camshaft and the inner camshaft so that the location of the urging device is close to the cam holder, wherein the urging device is located on the outer circumference of the outer camshaft, wherein the urging device has a first end directly connected to the outer camshaft by a first pin, and a second end directly connected to the inner camshaft by a second pin, and wherein the urging device is located between the first cam and the cam phase changing device in an axial direction of the inner camshaft.