Patent ID: 7954468

Claim:
A mechanical adjuster comprising: a housing formed in a cylindrical shape, and formed at its inner peripheral side with a threaded portion; a first threaded member thread-coupled with the threaded portion of the housing, for receiving a reaction of a valve spring or chain; a second threaded member connected with the first threaded member in a state where these are freely movable in an axial direction of the housing and are mutually restrained in a rotating direction, and thread-coupled with the threaded portion of the housing; a first elastic member arranged between the first threaded member and the second threaded member, for urging the first threaded member and the second threaded member in a direction to separate from each other along the axial direction of the housing; and a second elastic member arranged between the second threaded member and the housing, for urging the second threaded member with a force in a reverse direction to a direction in which reaction of the valve spring or chain acts, wherein the first threaded member is supported on the housing so as to be rotatable according to the reaction of the valve spring or chain or a direction of an axial force from the first elastic member, the second threaded member is supported on the housing so as to lock itself in terms of the direction of an axial force from the first elastic member and so as to be rotatable according to a direction of an axial force from the second elastic member, and when a load acting on the first threaded member and torques generated in the first threaded member and the second threaded member satisfy predetermined conditions, the first threaded member and the second threaded member move along the axial direction of the housing while rotating in a forward direction or a reverse direction in a mutually integrated manner.