VARIABLE VALVE TIMING DEVICE AND METHOD OF ASSEMBLING SAME

摘要

The valve timing varying device according to the present invention includes a housing rotor (20) composed of a front side housing member (22) and a rear side housing member (21), a vane rotor (30), and an urging spring (40) for rotationally urging the vane rotor in one direction with respect to the housing rotor. The urging spring (40) has a coil part (41), a first end (42) provided outside in a radial direction with respect to the coil part, and a second end (43) provided inside in the radial direction with respect to the coil part. The front side housing member (22) has a first latching concave part (22f) for latching the first end on an inside wall face. The vane rotor (30) has an accommodation concave part (35) for accommodating at least a part of the coil part at the front end side, and a second latching concave part (36) for latching the second end in an area facing an opening (22c). Therefore, wear and a friction force in a sliding area can be reduced and the assembling performance can be improved while achieving the size reduction of the device.

主权项

1. A valve timing varying device that varies an opening and closing timing of an intake valve or an exhaust valve driven so as to open and close via a camshaft by controlling an oil pressure in an advanced angle chamber and a retarded angle chamber, the valve timing varying device comprising:
a housing rotor rotated on a rotation axis of the camshaft in synchronism with rotation of the crankshaft; a vane rotor rotated integrally with the camshaft and accommodated in an accommodating chamber of the housing rotor so as to relatively rotate within a predetermined angle range to divide the accommodating chamber into the advanced angle chamber and the retarded angle chamber; and a torsional coiled urging spring for urging the vane rotor toward one rotation direction relative to the housing rotor, wherein the housing rotor is composed of a bottomed cylindrical front side housing member having an opening though which a bolt for fastening the vane rotor to the camshaft is inserted from a front side, and a rear side housing member joined with the front side housing member, the urging spring has a coil part, a first end provided outside in a radial direction with respect to the coil part, and a second end provided inside in the radial direction with respect to the coil part, the front side housing member has a first latching concave part for receiving and latching the first end of the urging spring on an inside wall face facing the vane rotor, and the vane rotor has an accommodating concave part for receiving at least a part of the coil part of the urging spring, and a second latching concave part for receiving and latching the second end of the urging spring in an area facing the opening on a front end side facing an inside wall face of the front side housing member.