Phase changing unit and valve timing changing device

Abstract

The invention relates to a phase changing unit and a valve timing changing device. The phase changing unit changes the relative rotational phase of the first rotating body and the second rotating body, and includes: a rotating member (80) connected to an external drive shaft to be applied with a rotational driving force; and a relative rotating mechanism (20, 40 ), the relative rotation is generated between the first rotating body (CS) and the second rotating body (10) through the rotation of the rotating member; and the rotating member (80) includes: a metal acting part (84), acting The relative rotation mechanism; the resin connecting part (82) is connected to the drive shaft; and the resin weak part (82) functions to block the transmission of rotational force between the drive shaft and the drive shaft when an excessive load is generated. Accordingly, it is possible to achieve simplification of the structure, reduction in the number of components, reduction in noise, reduction in cost, etc., and it is possible to prevent damage to the electric motor when an overload occurs.

Description

technical field [0001] The present invention relates to a phase changing unit for changing the rotational phases of two rotating bodies, and more particularly, to a phase changing unit for changing the opening / closing timing (valve timing) of an intake valve or an exhaust valve of an internal combustion engine The phase changing unit and the valve timing changing device using the same. Background technique [0002] Conventional valve timing changing devices are known to include a drive rotating body that is interlocked with the rotation of the crankshaft, a driven rotating body that rotates integrally with the camshaft, a planetary carrier, a planetary gear, an electric motor including a motor shaft, and A movable shaft joint mechanism for connecting a motor shaft of an electric motor and a planetary carrier, etc. (for example, refer to Patent Document 1). [0003] Here, the movable shaft joint mechanism includes two joint members made of metal, and has a structure that fun...

AI Technical Summary

Problems solved by technology

[0004] However, in the structure of the movable shaft joint mechanism and the planetary carrier, the structure is complicated, and machining such as providing a low-strength portion to the joint member is required, resulting in high cost.

[0005] In addition, since the motor shaft, the two joint members, and the planetary carrier are made of metal, the whole is a heavy object, so the moment of inertia is large, and the electric motor requires a large output torque.

[0006] Furthermore, when the torsion force fluctuates, there is a possibility that metal components may collide with each other to generate a crashing sound.

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