Tsubakimoto Chain Company

Shuji Sasamoto

Toshihiro Hosokawa

Nobuyuki Fujimoto

Yoshiaki Sugimoto

Takero Nakagawa

Yutaka Uchiumi

Tomofumi Otani

Yoshitaka Yoshimura

Masaaki Ikeda

Koji Tanaka

Katsutoshi Shibayama

Toshio Takahashi

Sachihiko Maeda

Satoshi Kuriyama

Joichi Nakamura

Masaharu Tamaki

Hiroshi Kobayashi

The present invention improves accuracy in the axial dimension of rolled parts for a chain such as bushings, rollers and similar. A rolled part is manufactured by cutting a strip of steel into a rectangular shape to obtain a rectangular base material having a predetermined dimension, The rectangular base material is rolled into a clindrical shape to obtain a cylindrically formed part having cut end surfaces face each other. A core is inserted for rolling the rectangular base material into the cylindrically formed part. The cylindrically formed part is then pressed through a die having a circular opening. The rolled part has a plurality of blind grooves on a surface thereof. While the cylindrically formed part is being pressed through the die having a circular opening, a plastic flow of the material of the cylindrically formed part intensively occurs in a direction toward the blind grooves. Since the plastic deformation of the rolled part is absorbed by the blind grooves, axial dimension of the rolled part hardly varies,

Rolled part for chain and manufacturing method therefor

Link plate for a chain

A link assembly for a chain comprising a link portion, a top plate portion having a top surface and a bottom surface made of a predetermined first material, and a plate member made of a different material than the top plate portion and integrally molded to at least the one of the top or bottom surfaces of the top plate portion.

Link for conveyor chains

An improved rocker joint pin type CVT chain has link plates connected by rocker joints, each including a rocker pin and a seat pin in an insertion bore of the link plate, the rocker pin and the seat pin making rolling contact along opposing rolling arcuate surfaces thereof as the chain bends and straightens when passing around a pulley. At respective minimums, the sectional area of the link plate formed between the link plate insertion bore and the outer periphery of the link plate relative to the pulley, is greater than the sectional area formed between the link plate insertion bore and the inner periphery. The radii of curvature of the inner rolling contact surfaces of the rocker pin and seat pin are smaller than those of the outer rolling contact surfaces. The fatigue strength at the minimum sectional area portions is thereby increased and the deviation from the chain center line of the contact point of the opposing rolling contact surfaces is minimized in a straightened position of the chain, thereby reducing the load applied to the inner minimum sectional area portion.

Rocker joint pin type CVT chain

An improved friction drive chain especially for a continuously variable transmission has a plurality of friction plates, each of the friction plates being substantially I-shaped in lateral section. The friction plates are arranged adjacent one another and connected by connecting link elements received in recesses formed in both lateral sides of the friction plates between upper and lower beam members of said friction plates. The connecting link elements are laterally grooved to bear longitudinally against the friction plates. The outer surfaces of the lower beam members of the plates define friction drive surfaces for contact with driving and/or driven pulleys. The friction plates are heat treated to increase strength, for example by quenching and annealing. The friction drive surfaces are formed with hardened layers by surface hardening treatment such as by electron beam or laser.

Friction plate for CVT chain

Growing community of inventors

Osaka, Japan

Shuji Sasamoto