Nsk Corporation

Kaname Yasuda

Takeshi Yamamoto

Haruhiko Kiyota

Kazuya Yamada

Seiichi Moriyama

Nobuyuki Hagiwara

Kiyoshi Sadakata

Kazuo Chikaraishi

Kazuki Hotta

Junichi Takano

Tomohiro Arai

Tatsuya Suehiro

Osamu Tatewaki

Minao Umeda

Tadashi Hibino

Keisuke Nakao

Hiroki Mizuno

Masaharu Igarashi

Kazuho Chikaraishi

Masahiro Inoue

Naofumi Fujita

Provided is an outer tube including a solid-shaped male-shaft portion and a bottomed cylindrical female-tube portion integrally formed with the male shaft portion. A hole cover is externally fitted to the female-tube portion and closes a gap between a dash panel separating the vehicle cabin interior and the vehicle cabin exterior of a vehicle body and the outer tube. In an assembled state in the vehicle body, the solid male-shaft portion is arranged in the vehicle cabin exterior, and an opening portion of a slide hole provided in the female-tube portion is arranged in the vehicle cabin interior.

Outer tube with hole cover

To provide a method of manufacturing a shaft for a steering device, the shaft including a spline shaft part to be coupled with an input shaft, a stopper part to be coupled with an output shaft, and an intermediate shaft part that couples the spline shaft part with the stopper part. The method includes: a step of forming a hole part recessed in an axial direction from one end of a pillar-shaped material by forging; and a step of pressing the material in which the hole part has been formed into a die to perform drawing in a radial direction on a portion of the material at which the spline shaft part and the intermediate shaft part are formed, and prolonging a length along the axial direction of the hole part at the same time by forging.

Shaft for steering device, method of manufacturing shaft for steering device, and electric power steering device

A shaft for a steering device has a first portion, a second portion, and a third portion that is a shaft integrated with the first portion and the second portion and couples the first portion and the second portion in a first direction. The outer diameter of the third portion is smaller than the length of the second portion in a second direction intersecting with the first direction, and is constant across a direction extending along the first direction. The hardness of the third portion is greater than the hardness of the second portion, and is constant across the direction extending along the first direction.

To provide a method of manufacturing a shaft for a steering device, the shaft including a spline shaft part to be coupled with an input shaft, a stopper part to be coupled with an output shaft, and an intermediate shaft part that couples the spline shaft part with the stopper part. The method includes: a step of forming a hole part recessed in an axial direction from one end of a pillar-shaped material by forging; and a step of pressing the material in which the hole part has been formed into a die to perform drawing in a radial direction on a portion of the material at which the stopper part is formed and prolonging a length along the axial direction of the hole part at the same time by forging.

An inner wheel element () is embedded in an outer wheel element (), such that a continuous range from an inner diameter side circumferential surface configuring an inner surface of a first annular concave part (), through an outer circumferential surface of the inner wheel element (), to an inner diameter side circumferential surface configuring an inner surface of a second annular concave part () in a surface of the inner wheel element () is covered over the entire circumference. Accordingly, a structure is achieved which easily secures a holding power of the synthetic resin outer wheel element with respect to the inner wheel element.

Worm wheel, worm reduction gear, and method for producing worm wheel

A first concave-convex part is formed in an outer diameter side circumferential surface of a first annular concave part provided in an axial one-side surface of an inner wheel element, and a second concave-convex part is formed in a bottom surface of a second annular concave part provided in the axial other-side surface of the inner wheel element. An outer circumferential part of the inner wheel element is embedded in an outer wheel element, and synthetic resin forming the outer wheel element partially enters into a plurality of concave parts constituting the first concave-convex part and the second concave-convex part. Thus, a configuration is achieved in which the holding power of a synthetic resin outer wheel can be secured from the metal inner wheel element, and the manufacturing error can be suppressed in the worm wheel tooth part provided in the outer circumferential surface of the outer wheel.

Worm wheel, worm decelerator, and method for producing worm wheel

An outer wheel element () formed in an annular shape with a synthetic resin and having a worm wheel tooth part () on an outer circumferential surface thereof embeds a radially outer end part of an inner wheel element () formed in an annular shape with a metal. An outer circumferential surface of the inner wheel element (), which is radially superimposed with an engaging part between the worm tooth part () and a the worm wheel tooth part serves as a cylindrical surface part (). This realizes a structure capable of suppressing manufacturing error of the worm wheel tooth part engaging with the worm tooth part.

Worm wheel and worm speed reducer

Structure of a cross universal joint is achieved in which the fact that an excessive torque was applied to a universal joint due to a collision accident or mishandling can be easily determined afterwards. Protrusions, which are straight lines as seen from the outside surface sides of linking arm sectionsof a yoke, are formed on the outside surfaces of the linking arm sections. When an excessive torque acts and the linking arm sectionsare plastically deformed, the protrusionschange from a straight line to a non-straight line. From this change it is possible to easily confirm that an excessive torque has been applied to a cross universal joint that includes this yoke. Moreover, when the space between the inside surfaces of the linking arm sectionsis taken to be D, and the length in the axial direction of the linking arm sectionsis taken to be L, the dimensions of the parts of the yokeare regulated so that the relation 3&#x3c;L/D&#x2266;4 is satisfied.

Growing community of inventors

Gunma, Japan

Kaname Yasuda