Nissan Motor Company Limited

Minoru Ota

Kazuhiko Takashima

Tatsuomi Nakayama

Yoshitaka Uehara

Manabu Wakuda

Hidenori Watanabe

Yoshiteru Yasuda

Toshikazu Nanbu

Yousuke Koizuka

Tokio Sakane

Kazuhito Takashima

Minoru Numakura

Mamoru Saito

Takashima Kazuhiko

An apparatus for forming recesses on a circumferential surface that defines a cylindrical bore in a workpiece includes a tool holder disposed coaxially with the cylindrical bore; a form roller support retained on the tool holder; a form roller rotatably supported on the form roller support, the form roller including projections on an outer circumferential surface thereof which are configured to form the recesses on the circumferential surface that defines the cylindrical bore in the workpiece. A control assembly is configured to control the form roller support such that the form roller is allowed to be in press contact with the circumferential surface that defines the cylindrical bore in the workpiece at a press contact load of a predetermined value on the basis of a centrifugal force which is exerted on the form roller support and the form roller during rotation of the tool holder.

Apparatus for forming microscopic recesses on a cylindrical bore surface and method of forming the microscopic recesses on the cylindrical bore surface by using the apparatus

There is provided a low-friction sliding member having a sliding surface slidable relative to an opposing member via an oil, wherein the sliding surface has a plurality of texture groups, each of the texture groups consists of at least two adjacent fine recesses having portions aligned to each other in either a sliding direction or oil flow direction; a distance between the texture groups is larger than a distance between the adjacent recesses; and the texture groups is distributed uniformly over the sliding surface.

Low-friction slide member, production apparatus therefor and process for producing the same

A micro-concave portion machining method is provided for forming micro-concave portions on an inner circumferential surface of a cylindrical bore form in a workpiece. The micro-concave portion machining method includes performing mirror surface machining and subsequent plastic working on the inner circumferential surface. The plastic working on the inner circumferential surface forms a plurality of recesses with each of the recesses including a micro-concave portion.

Micro-concave portion machining method

An apparatus for forming microscopic recesses on a circumferential surface that defines a cylindrical bore in a workpiece, the apparatus including a form roller, a form roller drive driving the form roller to rotate about a rotation axis in an axially offset position in which the rotation axis is offset from a central axis of the cylindrical bore, an axial drive causing a relative axial movement of the workpiece and the form roller drive along the central axis of the cylindrical bore, and a rotary drive driving at least one of the workpiece and the form roller drive to rotate about the central axis of the cylindrical bore while keeping an outer peripheral surface of the form roller pressing against the circumferential surface that defines a cylindrical bore.

An apparatus for machining a circumferential surface defining a cylindrical bore of a workpiece, the apparatus including a tool holder rotatable about a first rotation axis, and a form roller supported on the tool holder so as to be rotatable about a second rotation axis parallel to a central axis of the cylindrical bore of the workpiece. The form roller has a diameter smaller than a diameter of the cylindrical bore of the workpiece and is adapted for forming a plurality of microscopic recesses on the circumferential surface defining the cylindrical bore of the workpiece.

Apparatus for machining a cylinder bore surface and method of machining the cylinder bore surface using the apparatus

A micro-roll forming device for providing a cylindrical blank metal article with a minute convexoconcave bearing surface, comprises a powered article holding structure that, when energized, rotates the cylindrical blank metal article about its axis; a forming tool that includes a form roller with a corrugated circular ridge; a tool holding structure that holds the forming tool in such a manner that the corrugated circular ridge of the form roller is directed toward and in contact with an outer surface of the cylindrical blank metal article rotatably held by the article holding structure; a biasing member that is incorporated with the tool holding structure to press the form roller against the outer surface of the cylindrical blank metal article with a given pressing force; and a powered moving structure that, when energized, moves at least one of the article holding structure and the tool holding structure in such a manner that the selected one moves in both a first direction perpendicular to an axis of the unselected one and a second direction parallel with the axis of the unselected one.

Micro-roll forming device

A high smoothness grinding process for obtaining a highly smooth surface of a metal material member. The process includes grinding an outer peripheral surface of a cylindrical or generally cylindrical metal material member by using a super abrasive grain grinding wheel in a condition in which a value [a peripheral speed of the grinding wheel/a peripheral speed of the metal material member] is not larger than 100, the grinding serving as a main grinding step.

High smoothness grinding process and apparatus for metal material

A method of forming a traction drive rolling element including: forming a preform having a working surface with an arcuate profile in section taken along a central axis; supporting the preform to be rotatable about the central axis; allowing a relative movement between the preform and a grooving tool for moving the grooving tool along the arcuate profile, simultaneously with rotating the preform about the central axis, to form microscopic recesses and projections alternately arranged in a direction perpendicular to the central axis along the arcuate profile; pressing a grindstone having a contact surface area of 25 mmor less, on the working surface; and allowing a relative movement between the preform and the grindstone for moving the grindstone along the arcuate profile simultaneously with rotating the preform while keeping pressing the grindstone on the working surface until a height of the microscopic projections becomes 3 &#x3bc;m or less.

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Kanagawa, Japan

Minoru Ota