Jtekt Corporation

Cnk Co., Ltd.

Toyoda Koki Kabushiki Kaisha

Tomoo Suzuki

Junji Ando

Tomoki Ogawa

Toshiyuki Saito

Masahiro Suzuki

Hiroyuki Hashitomi

Kazuyoshi Yamakawa

Daigo Yamamoto

Kazunori Aoki

Kazuyuki Ichikawa

Hirofumi Kuwabara

Tomonori Ohwaki

Akinori Iwai

Nobuyoshi Yoshimura

Toshiya Kubo

Yoshiaki Senga

Plural spline shafts are arranged around columnar plasma, and plural spline shafts are coaxially aligned in a direction that the columnar plasma extends within a vacuum chamber. The plural coaxially aligned spline shafts are positioned so that axial gap is formed between the respective male spline sections. The axial gap of the plural male spline sections is positioned at a center of the columnar plasma in the direction that the columnar plasma extends.

Method for forming DLC film on spline shaft and hot cathode PIG plasma CVD device

A formation method of a coating that coats a coated body with the coating includes: generating cylindrical plasma in a vacuum deposition chamber as well as supplying material gas into the vacuum deposition chamber; applying pulse voltage to the coated body; and attaching a shield member that shields an uncoated member to an uncoated part where the coating of the coated body is not formed with separation spacing over a coated part where the coating is to be formed for preventing decrease of hardness of the coating in the coated part.

Formation method of coating

A sliding member has a base material whose surface is at least partially covered with a DLC film, wherein an intermediate layer is interposed between the base material and the DLC film, and the intermediate layer has a multilayer structure obtained by stacking a first Cr layer, a CrN layer and a second Cr layer successively from the side closer to the base material.

Sliding member

A propeller shaft includes a first shaft and a second shaft. The first shaft has a torque transmission face in which a plurality of fine grooves extending in a first direction (face width direction) is formed. The second spline shaft is coupled to the first spline shaft so as to be movable relative to the first spline shaft in the axial direction of the first spline shaft, and has a torque transmission face in which a plurality of second fine grooves extending in a second direction that crosses the first direction is formed.

Propeller shaft

A spline shaft that can suppress occurrence of stick slip by measures other than just simply making the surface roughness smaller. The spline shaft includes a first shaft with an outer-peripheral spline formed, and a second shaft with an inner-peripheral spline, which engages with the outer-peripheral spline peripherally and that is made slidable axially, formed. And, at least either one of the outer-peripheral spline and the inner-peripheral spline includes a substrate whose surface is formed to a predetermined surface roughness, and an amorphous carbon-system hard thin film, which coats and forms the surface of substrate.

Spline shaft

The contact angle of the ballwith each first guide trackof an inner joint memberis made to become smaller gradually from an opening portion side toward a bottom portion side, and the curvature radius for the first guide trackis made to become larger gradually from the opening portion side toward the bottom portion side. If the contact angle only were made to become smaller gradually from the opening portion side toward the bottom portion side, the contact angle would become too small thereby to cause chattering in rotation to be generated. If the curvature radius only were made to become larger gradually from the opening portion side toward the bottom portion side, a contact ellipse Mdefined by the balland the first guide trackwould become tool small, which would cause the ballto make dents on the surface of the first guide track. However, the aforementioned drawbacks can be obviated by gradually diminishing the contact angle and gradually enlarging the curvature radius from the opening portion side toward the bottom portion side.

Constant velocity joint

Growing community of inventors

Chita-gun, Japan

Tomoo Suzuki