Ntn Corporation

Masato Chokyu

Kazuhiko Yoshida

Kenta Yamazaki

Shintaro Suzuki

Takafumi Iwamoto

Masafumi Osugi

Hiromi Hayashi

Rikuou Takagi

A coating film having excellent adhesion, even without the presence of a chemical conversion film treatment as an undercoat, and a metal automotive part having the coating film. A powder is deposited by powder-coating onto the surface of a metal automotive part that has been quenched after simultaneously forging, and tempering the metal automotive part and bake-hardening the deposited powder to form a skin film on the surface of the metal automotive part. The surface of the metal automotive part before the powder is powder-coated thereon is a work-hardened material surface that has not been subjected to a chemical conversion filming treatment.

Method for forming coating film on constant velocity universal joint

Provided is a cage () for a constant velocity universal joint, which is formed into a ring shape with a substantially uniform thickness, including a plurality of pockets () formed in a circumferential direction of the cage (), for receiving torque transmitting balls, respectively, the cage () being formed of carbon steel including 0.41 to 0.51 mass % of C, 0.10 to 0.35 mass % of Si, 0.60 to 0.90 mass % of Mn, 0.005 to 0.030 mass % of P, and 0.002 to 0.035 mass % of S, with the balance being Fe and an element inevitably remaining at the time of steelmaking and refining, the cage () being subjected to carburizing, quenching, and tempering as heat treatment, each of the plurality of pockets () having a side surface () finished after the heat treatment.

Cage for constant velocity universal joint, fixed type constant velocity universal joint incorporating same, and drive shaft incorporating said fixed type constant velocity universal joint

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Shizuoka, Japan

Masato Chokyu