Abstract: Provided is a reusability determination method for a gear that makes it possible to determine reusability of a gear during or after use to increase the reuse ratio. The reusability determination method for a gear of the present invention includes a step of measuring a content of retained ? phases in the gear, a step of calculating a change rate of the content of the retained ? phases, a step of measuring residual stress applied to the gear, a residual stress ratio calculation step of calculating a residual stress ratio to residual stress in an initial state of the gear, and a reusability determination step of determining whether or not the gear is reusable on the basis of results of the calculation in the retained ? phase change rate calculation step and the residual stress ratio calculation step.

Abstract: The object of this invention is to provide a folding outer mirror, in which the cost reduction, the prevention of large sizes and heavy weights, and higher stiffness of the stopper mechanism can be obtained. The folding outer mirror includes a mirror base extending outside from a side surface of vehicle body, a mirror assembly attached rotatably to the mirror base, and a stopper mechanism for stopping the mirror assembly at a predetermined position. The stopper mechanism is provided with a base-side engaging surface formed in the mirror base, and a body-side engaging surface formed in the mirror assembly and being in plane contact with the base-side engaging surface at a predetermined position. The base-side engaging surface and the body-side engaging surface are formed such that a raising angle relative to a rotating direction of the mirror assembly becomes a sharp angle.

Abstract: In a shaft structure of a retractable outer mirror, a shaft includes: a first member; and a second member. The first member includes: a base section having an attachment boss; a shaft section vertically arranged on the base section; and a catch part by which a catch member is caught. The second member includes: clutch parts that performs an engagement or a release of the engagement in response to rotation of a frame; and an insert portion inserted into a shaft section. The second member is fitted in with the shaft section from above a top end side of the shaft section.

Abstract: The object of this invention is to provide a folding outer mirror, in which the cost reduction, the prevention of large sizes and heavy weights, and higher stiffness of the stopper mechanism can be obtained. The folding outer mirror includes a mirror base extending outside from a side surface of vehicle body, a mirror assembly attached rotatably to the mirror base, and a stopper mechanism for stopping the mirror assembly at a predetermined position. The stopper mechanism is provided with a base-side engaging surface formed in the mirror base, and a body-side engaging surface formed in the mirror assembly and being in plane contact with the base-side engaging surface at a predetermined position. The base-side engaging surface and the body-side engaging surface are formed such that a raising angle relative to a rotating direction of the mirror assembly becomes a sharp angle.

Abstract: In a shaft structure of a retractable outer mirror, a shaft includes: a first member; and a second member. The first member includes: a base section having an attachment boss; a shaft section vertically arranged on the base section; and a catch part by which a catch member is caught. The second member includes: clutch parts that performs an engagement or a release of the engagement in response to rotation of a frame; and an insert portion inserted into a shaft section. The second member is fitted in with the shaft section from above a top end side of the shaft section.