Kokan Kako Co., Ltd.

Mitsui Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

K. K. Tube Forming

Yanagawa Seiki K.k.

Masanobu Nakamura

Noboru Ashikawa

Suehiro Hasshi

Toshifumi Yamamoto

Tadayoshi Nakamura

Tetsuro Saruwatari

A suspension arm for a vehicle is provided, the suspension arm including an L-shaped arm body having a first end portion, an intermediate portion, and a second end portion. The first end portion is adapted to pivotally connect the arm body to a vehicle. The intermediate portion has a bulge formed thereon which is adapted to pivotally connect the arm body to the vehicle. The second end portion is adapted to connect the arm body to a vehicle wheel knuckle. The arm body is formed from a single piece of pipe material having a closed cross-section.

Suspension arm, and process for producing the same

A method for forming projections on the periphery of a pipe in order to provide branch pipes, such as a manifold for automobiles, is characterized in that the branch pipes are formed by a bulging process to have a predetermined thickness without thinning. A first embodiment includes the step of indenting a pipe member by press work or the like, at locations close to the position of a projection which is to be formed, in a preliminary deforming process. The deformed pipe member is then placed in a bulge mold having a recess or space, with the pipe member being positioned so that the indentations in the pipe member lie adjacent the recess in the bulge mold. Pressurized fluid is then introduced into the interior of the pipe member to bulge the wall of the pipe member into the recess in the bulge mold. A second embodiment employs a bulge mold having fixed recesses or spaces and variable recesses or spaces for forming a plurality of projections. The second embodiment includes the step of bulging the pipe material into the fixed spaces while the variable spaces are occupied by detachable members, and the step of removing the detachable members from the mold and then bulging the pipe member again.

Method for manufacturing a pipe with projections

A method of securing a tubular member within an annular cam member for the manufacture of a cam shaft is provided, including the steps of forming a cam member from sintered materials with at least two axially extending grooves being provided in the inner surface of the cam member adjacent the portion of the cam member having the greatest thickness such that a radially projecting ridge is defined between adjacent grooves, fitting the tubular member into the cam member, supplying a working fluid to the interior of the tubular member and applying pressure to the fluid so as to expand the tubular member while maintaining substantially the same wall thickness within the cam member until the ridge bites into the outer surface of the expanding tubular member and becomes tightly engaged therewith. The pressure applied to expand the tubular member is less than that required to fully expand the tubular member along the inner surface of the cam member.

Method of connecting a tubular member with an annular member

A method for forming branch pipes on the periphery of a pipe, such as a manifold for automobiles, is characterized in that the branch pipes are formed by a bulging process to have a predetermined thickness without thinning. A first embodiment includes the step of indenting a pipe member by press work or the like, at locations close to the position of a projection, in a preliminary deforming process. A second embodiment employs a bulge mold having fixed spaces and variable spaces for forming a plurality of projections. The second embodiment includes the step of bulging the pipe material into the fixed spaces while the variable spaces are occupied by detachable members, and the step of removing the detachable members from the mold and then bulging the pipe member again.

A method and an apparatus for manufacturing cam shafts in which cam members are held in respective rotatable axially aligned rings by holding members connected within the rotatable rings so that a pipe member cam be inserted through respective aligned holes of the cam members. The rings are individually rotatable so as to rotate the cam members by respetive predetermined angles. After a pipe member is inserted in the holes of the individually rotated cam members, a bulging process device seals respective opposite ends of the pipe member and forces a pressurized fluid into the pipe so as to bulge the pipe to fix the pipe in the respective holes, thereby to form the cam shaft.

Cam shaft manufacturing method and device used therein

A tubular transmission shaft for use as a drive shaft which transmits rotation from an engine to an axle of driving wheels of an automobile, including a tubular member having a smaller diameter at the middle portion thereof and larger diameter at both ends thereof and solid shaft members which are inserted and pressure tightened in both ends of the tubular member.

Growing community of inventors

Kamakura, Japan

Masanobu Nakamura