Abstract: A composite hose is constructed to have an outer peripheral portion and an inner peripheral portion. The outer peripheral portion includes an elastic layer and a reinforcing layer provided on an outer periphery of the elastic layer. The inner peripheral portion includes a corrugated metal tube which is provided with a corrugated portion formed with corrugation hills and corrugation valleys. A distance between the reinforcing layer and tops of the corrugation hills of the corrugated metal tube is designed 0.27 mm or less.

Abstract: An arm member is used as, for example, a suspension arm of an automobile. The arm member comprises a main body made of a pipe member and a coupling member having a connecting portion. The pipe member is made of aluminum or its alloy. The coupling member is made of aluminum and includes a bushing mounting portion for mounting a vibroisolating bushing. The thickness of the peripheral wall of the end portion of the main body is increased in thickness to have a thickness thicker than that of the other portion of the main body. The connecting portion is abutted to the peripheral wall of the end portion to form an abutted portion, and connected thereto at the abutted portion. Thus, the coupling member is coupled to the main body.

Abstract: There is disclosed a member for use with an arm that is used as an automobile suspension arm, for example. The member comprises a rodlike body and bushing-mounting portions formed at both ends of the rodlike body. The rodlike body consists of a hollow tube fabricated by extruding an aluminum material into a circular cross section. The bushing-mounting portions are formed by welding bushing-mounting members to both ends of the rodlike body. Each bushing-mounting member has a hole in which a bushing is mounted with a press fit. The curved wall of the rodlike body is recessed at the longitudinal center of the rodlike body. When an automobile having the aforementioned member collides, an axial compressive load is applied to the rodlike body. The rodlike body buckles at the recessed portion. This mitigates the impact in the collision.

Abstract: A connected structure includes a supporting member and a bushing mounting member connected thereto. The supporting member is made of a pipe having a round cross-sectional shape. The bushing mounting member includes a bushing mounting portion for mounting a bushing having a rubber elastic member and a connecting portion protruded from the bushing mounting portion. The connecting portion is press-fitted into an opening at one end of the supporting member, and the connecting portion and the supporting member are joined together along a circumference of the supporting member by a friction agitation joining method. Accordingly, the connecting member which is light in weight and high in strength with an improved efficiency for utilizing the surrounding space and a predetermined characteristics of a bushing can be obtained.

Abstract: A joining structure for joining adjacent members includes a first member and a second member. One end portion of the first member is joined to one end portion of the second member such that protruded portions formed on the one end portion of the first and second members are engaged with corresponding dented portions formed on one end portion of the second and first members, respectively. A hollow joining member is fitted on a joined portion of said first and second members and crimped on the joined portion.