Ihi Corporation

Norimasa Taga

Michiko Baba

Kouzou Hasegawa

Toshihiro Hayashi

Tooru Fujii

Yuuichi Miura

Kiyofumi Fujimura

Nobutaka Yanagidani

Junichi Enomoto

Kimiaki Nakamura

Daigo Yoneda

A spline connection structure includes a shaft portion having teeth with crowned tooth surfaces formed at equal intervals on an outer circumferential surface and a cylindrical portion having grooves into which the teeth of the shaft portion are fitted formed on an inner circumferential surface are connected. Two adjacent tooth surfaces facing each other are bent while maintaining a constant distance therebetween in a tooth width direction when viewed from a diameter direction of the shaft portion.

Spline connection structure and spline shaft

An inner diameter measuring device for measuring a shape of an inner surface of a cylindrical member, comprising an image pickup unit () disposed on a base end side of a frame unit () and for picking up an image of a forward end side, a cone mirror unit () provided on a forward end side of the frame unit and having a cone mirror () with a conical reflection surface at a forward end, and a laser beam emitting unit () for emitting a laser beam () toward a forward end of the cone mirror, wherein the cone mirror unit can be replaced by another cone mirror unit having a cone mirror with a different vertical angle to suit measuring condition.

Inner diameter measuring device

An inner diameter measuring device comprises an object to be measured supporting carriage, being arranged movably along a rail installed on an upper surface of a bed and used for holding a hollow pipe to be measured, a supporting shaft extended from a base end to a forward end of the bed, being insertable into the pipe to be measured and being cantilever-supported, and an inner diameter measuring unit installed on a forward end of the supporting shaft, being insertable into the pipe to be measured and for measuring the inner surface of the pipe to be measured. The inner diameter measuring unit is adapted to be inserted into the pipe to be measured, and is adapted to measure an inner diameter of the pipe to be measured in a process where the object to be measured supporting carriage is moved toward the base end of the supporting shaft.

An inner diameter measuring device, comprising a measurement carriage traveled in straight direction, pipe holding frames disposed at front and rear positions and for mounting a pipe to be measured, a measuring head supported at a forward end of a supporting member extended in a direction parallel to advancing direction of the measurement carriage, a first and second laser distance measuring unit disposed in traveling distance of the measurement carriage and for performing distance measurement in two directions perpendicularly crossing to each other, wherein the pipe holding frames can adjust a supporting position of the pipe to be measured, the measuring head measures an inner diameter of the pipe to be measured, the first and second laser distance measuring units measure distance with respect to each of the reference outer peripheral surfaces at the parts, and the supporting position of the pipe to be measured is adjusted.

Inner diameter measuring device and inner diameter measuring method

An inner diameter measuring device () for measuring an inner diameter by inserting an inner diameter measuring unit into an inside of a hollow member to be measured, comprises a supporting shaft () having the inner diameter measuring unit supported at a forward end, and a supporting mechanism unit () for cantilever-supporting the supporting shaft, wherein the supporting mechanism unit has a frame (), a spherical bearing () and a deflection adjusting unit (), wherein the shaft is supported by the frame via the spherical bearing, an end portion () of the supporting shaft is passed through the spherical bearing and is extended, and a position of an end of the end portion in vertical direction is adjusted by the deflection adjusting unit.

An inner diameter measuring device, comprising an image pickup unit () provided at a base end of a frame unit () and for picking up an image of a forward end side, a centering unit () provided at a forward end of the frame unit, a laser beam diffusing unit () provided on the centering unit and at a forward end side of the centering unit via a light transmitting window, a laser beam emitting unit () provided on a base end side of the centering unit, and a cone mirror () provided on the laser beam diffusing unit and having a conical reflection surface at a forward end, wherein a center line of the cone mirror coincides with an optical axis of the image pickup unit, and the centering unit is adapted to adjust a posture of the image pickup unit so that a laser beam () projected from the laser beam emitting unit enters a vertex of the cone mirror.

An inner diameter measuring device () for measuring an inner diameter of a hollow object to be measured, wherein the inner diameter measuring device comprises a circulation unit () and a measuring head () and is insertable into inside of an object to be measured, wherein the measuring head has a contact measuring unit () for measuring the inner diameter by contacting an inner surface of the object to be measured and an advancing/retreating unit () for making the contact measuring unit to advance and to retreat in a radial direction, and wherein the circulation unit can rotate the measuring head around a center line () of the inner diameter measuring device.

The invention relates to an inner diameter measuring device, having a non-contact measuring unit () and a contact measuring unit () arranged along the same center line, wherein the non-contact measuring unit comprises an image pickup unit () arranged on the center line, a laser beam emitting unit (), and a laser beam diffusing unit () having a cone mirror, wherein a laser beam projected from the laser beam emitting unit to the cone mirror is reflected over a total circumference by the cone mirror, the image pickup unit takes an optical ring which is formed by projecting the reflected laser beam to an inner surface of a hollow portion, at least one of an inner diameter or a shape of the inner surface is measured based on an image picked up, and wherein the contact measuring unit comprises a contact measuring head () and a circulation unit () for circulating the contact measuring head around the center line, wherein the contact measuring head has a contact measuring unit having a contact at a forward end and for detecting a displacement of the contact, an advancing/retreating unit for advancing and retreating the contact measuring unit in radial direction, and a scale unit for measuring an advancing/retreating distance of the contact measuring unit.

A rotation restricting device for rotation machine comprises a rotation shaft supporting body (), a rotation shaft () rotatably provided on the rotation shaft supporting body, a fixing rind () fixed on an end portion of the rotation shaft, a position finding dog () provided on the fixing ring, a rotary cam () rotatably provided on the rotation shaft and disposed as relatively rotatable with respect to the fixing ring, a cutaway portion () formed on the rotary cam, a rotary dog () disposed on the rotary cam, and a stopper () provided on the rotation shaft supporting body, wherein the position finding dog is accommodated in the cutaway portion and can be rotated within a range in space as formed by the cutaway portion, the stopper is positioned on a locus of rotation of the rotary dog, and the rotation of the rotary cam is restricted when the rotary dog comes in contact with the stopper.

Growing community of inventors

Tokyo, Japan

Norimasa Taga