Thk Co., Ltd.

Akimasa Yoshida

Hiroshi Niwa

Kentaro Nishimura

Satoshi Fujita

Takuya Horie

Soshi Miyahara

Shinji Aoki

Hiroyuki Arai

Hidekazu Michioka

Takashi Sakuyama

Satoru Nagai

Daisuke Yatsushiro

Tetsuya Miura

Masakazu Uesugi

Ayako Miyajima

Kazuto Homma

Yusuke Todoroki

Kentarou Nishimura

Makoto Iizumi

Takuya Iguchi

Hiroyuki Kishi

Masahiko Yoshino

Ryuji Furusawa

Manabu Sato

Mitsumasa Wada

Hiroshi Kaneshige

Akihiro Teramachi

Satoshi Kashiwagura

Tsutomu Togashi

Yoshinobu Moriyuki

Marie Horikawa

Teruaki Ooka

Lina Teng

Yasuhiro Kubota

Noriaki Chikamoto

Keisuke Nagaike

Tetsuya Sakagami

A track member or a movable member constituting a motion guide device includes a rolling part formed of a metal material contacting with a plurality of rolling bodies and forming a rolling body rolling surface a, a mounting part formed of a metal material having a mounting hole for mounting an external member, and a track body or a movable body formed of FRP jointed with the rolling part and the mounting part and forming the track member or the movable member, and the mounting part and the track body or the movable body have joint holes, opened in a direction orthogonal to a lamination direction of FRP reinforced fiber sheets S forming the track body or the movable body at a time of the joint, and can be jointed using jointing means. An external member can be securely mounted to the motion guide device formed of FRP.

Motion guide device and actuator

A press-fitting jig for a closure cap which is configured to press-fit a closure cap into a bolt mounting hole formed in a track rail of a guide device. The press-fitting jig is mounted to a moving block, which is assembled to the track rail through intermediation of a plurality of rolling elements and is configured to move on the track rail. The press-fitting jig includes: a finishing surface which is brought into slide contact with an upper surface of the track rail having the bolt mounting hole opened therein; and a guide surface, which is formed adjacent to the finishing surface and forms a wedge-shaped space with the track rail in a longitudinal direction of the track rail, the guide surface being configured to push the closure cap temporarily placed in the bolt mounting hole into the bolt mounting hole along with movement of the moving block.

Press-fitting jig for cover cap of bolt mounting hole

A motion guide apparatus cooling nozzle is provided which can gas-cool a motion guide apparatus. Cooling nozzlesandof the present invention are mounted on a blockof the motion guide apparatus to cool at least one of a guide railand a blockthat is assembled to the guide railvia a rolling elementin such a manner as to be movable relatively. The cooling nozzlesa andinclude an inner passageinto which gas is introduced, an openingconfigured to emit a gas flow introduced into the inner passage, a deflection surfacethat is provided adjacently to the openingto bend the gas flow emitted from the opening, and a guiding surfaceconfigured to attract gas outside the cooling nozzlesand

Motion guide apparatus cooling nozzles, motion guide apparatus with cooling nozzles, and motion guide apparatus cooling system

A magnetic-scale-equipped motion guide apparatus is provided which can scrape iron powder adhered to a magnetic scale by a scraper or seal of a movable member without inviting adverse effects such as wearing away and deformation of the magnetic scale. The magnetic-scale-equipped motion guide apparatus of the present invention comprises a track memberhaving a rolling element rolling portionand also an upper surface where through holesinto which fastening members are inserted open, a movable membermovably assembled to the track membervia a plurality of rolling elements, a grooveformed in the track memberand extended in a longitudinal direction, a magnetic scaleaccommodated in the grooveand having north and south poles alternately formed in the longitudinal direction, and a cover memberthat covers the magnetic scaleand also the through holesof the track member

Magnetic-scale-equipped motion guide apparatus

A motion device () includes a track rail (), a moving body (), a plurality of rolling elements () rolling in an endless circulation passage formed at the track rail () and the moving body (), a pair of lid bodies () attached to end surfaces of the moving body () in a movement direction thereof, and a connector cover body () disposed along a rolling element rolling surface () formed at the moving body () to cover a rolling element connector () connecting and holding the rolling elements (). The connector cover body () has a frame-shaped cover member () which is fixed to the pair of the lid bodies () to be integrally disposed at both ends of the rolling element rolling surface () in a width direction thereof.

Motion device

There is provided a roller screw in which a twisted amount of an unloaded return path is reduced. The roller screw has a screw shafthaving a spiral roller-rolling surfaceon an outer peripheral surface thereof; a nuthaving a spiral loaded roller-rolling surfaceon an inner peripheral surface thereof, the spiral loaded roller-rolling surface being opposed to the roller-rolling surfaceof the screw shaft; a circulation memberarranged in the nutand formed to have an unloaded return pathconnecting one end and the other end of the loaded roller-rolling surface, whose turn number is less than one, of the nut; and a plurality of rollersarranged in a one-turn roller circulation path composed by a loaded roller-rolling pathand the unloaded return path. The circulation memberguides the rollers which have moved and arrived at the one end of the loaded roller-rolling pathhaving less than one turn, to the unloaded return path, and then returns the rollers to the other end of the loaded roller-rolling pathhaving less than one turn. The number of turns of the loaded roller-rolling pathis set to be less than one turn, whereby the rollerswhich have arrived at one end of the loaded roller-rolling pathcan be transferred to the other end of the loaded roller-rolling pathwithout changing their attitudes.

Roller screw and method of circulating rollers in roller screw

A motion device includes an orbital element, and a moving element into which the orbital element is inserted, the moving element guided so as to be able to reciprocate in a longitudinal direction of the orbital element, wherein at ends of the moving element, cylindrical protrusions into which the orbital element is inserted are formed and protrude in the longitudinal direction of the orbital element so as to be pivotally supportable on bearings, and total size around the orbital element in a direction perpendicular to the longitudinal direction of the protrusions is smaller than that of the moving element.

Motion device and moving device

Provided is a roller screw capable of preventing rollers moving from an unloaded return path to a loaded roller rolling path from coming into collision with a scooping portion. The roller screw has: a screw shafthaving a spiral roller rolling surfaceformed on an outer peripheral surface thereof; a nuthaving a loaded roller rolling surfaceformed in an inner peripheral surface thereof; a circulation memberhaving an unloaded return path connecting one end of the loaded roller rolling surfaceof the nutto an opposite end thereof; and a plurality of rollersarranged in a loaded roller rolling pathand the unloaded return path. In the circulation member, as a scooping portion that juts toward the screw shaftand provided for scooping the rollersmoving in the loaded roller rolling pathup into the unloaded return path, a pair of diagonal corresponding partsis provided which are in contact with diagonal partsof a rectangular side surface of each rollerand a width between which is gradually narrower as they are deeper in the unloaded return path in such a manner that a cross section of the unloaded return path is closer to a rectangle.

Roller screw

A roller screw is provided having a structure suitable for circulating rollers. The roller screw has a screw shaftwith a spiral roller rolling grooveformed on an outer peripheral surface thereof; a nutwith a spiral roller rolling grooveopposed to the roller rolling groove of the screw shaft and formed on an inner peripheral surface thereof; and a plurality of rollersarranged in a load roller rolling pathbetween the roller rolling grooveof the screw shaftand the roller rolling grooveof the nut. Inside the nutis provided a roller return pathextending linearly in parallel with an axis line of the nut. To opposite end faces in an axis line direction of the nutare attached direction change path forming membersin which direction change pathsto connect the load roller rolling pathand the roller return pathare formed. The roller return pathis twisted to rotate an attitude of each of the rollerswhile the rollersmove in the roller return path

A motion guide device is provided which comprises a chain of rollers in which retainers are interposed, in which the chain of rollers is given a degree of freedom of rotation. The motion guide device comprises a track member () on which a roller rolling part () is formed which allows rollers () to roll on along the roller rolling part; a moving member () on which a loaded roller rolling part () facing the roller rolling part () is formed; a plurality of rollers () arranged on a roller circulation path containing a loaded roller rolling path () formed between the roller rolling part () of the track member () and the roller rolling part () of the moving member (); and a plurality of retainers () respectively interposed between rollers of the plurality of rollers (). The plurality of retainers () are mutually separated, each of the retainers () which is divided into a first divided member () contacting one roller of a pair of rollers () with each retainer () sandwiched therebetween and a second divided member () contacting the other roller () of the pair of rollers, and the first divided member () is allowed to rotate relative to the second divided member ().

Motion guide device

Provided is a screw device capable of preventing occurrence of any elevation change at a joint between a ball return path of a circulation member and a loaded ball rolling groove of a nut. The circulation memberhas end partsandeach of which the periphery includes a rolling groove connecting partpositioned to the side of a loaded ball rolling grooveof a nutand connected to the loaded ball rolling grooveof the nutand a scooping partpositioned to the side of a ball rolling groove of a screw shaftand scoops up ballsfrom a loaded ball rolling path. The rolling groove connecting partof each of the end partsandis made of resin and formed integral with the nut

Screw device and method of manufacturing the same

The present invention provides a screw device which takes a heavy load in one direction along the axis of the screw shaft and only a light load in the opposite direction, the screw device capable of providing ease of control of preloading. The screw device of the present invention has a screw shaftwith an outer surface having a ball rolling groovefor rolling ballsand a roller rolling groovefor rolling rollersboth spirally formed thereon; a ball nutwith an inner surface having a ball rolling groovespirally formed thereon facing the ball rolling grooveof the screw shaft; a roller nutwith an inner surface having a roller rolling groovespirally formed thereon facing the roller rolling grooveof the screw shaft; a plurality of ballsarranged between the screw shaftand the ball nut; and a plurality of rollersarranged between the screw shaftand the roller nut. The ball nutand the roller nutare connected along an axis of the screw shaft

A roller screw of the present invention has a screw shafthaving a roller rolling surfacespirally formed with a lead on an outer surface thereof; a nuthaving a roller rolling surfacespirally formed on an inner surface thereof to face the roller rolling surfaceof the screw shaft; and a plurality of rollersarranged in a rolling pathbetween the roller rolling surfaceof the screw shaftand the roller rolling surfaceof the nutand moving around the screw shaft while rotating on rotation axes of the rollers. In this roller screw, each of the rotation axesof the rollerssubstantially crosses a center lineof the screw shaft. Since each of the rotation axesof the rollerscrosses the center lineof the screw shaft(in other words, the rollersarranged in the rolling pathare not skewed from the beginning) even when the rolling pathhas the lead, the rollerare allowed to move smoothly.

The invention relates to a ball screw device in which a screw shaft and a nut member are threadedly engaged with each other through a number of balls. In such a ball screw device, an inner surface of a cover plate contacting an end surface of a nut main body is provided with a projecting return piece adapted to be fit-engaged with a recess cut in an inner peripheral surface of the nut main body, the return piece being provided with a scoop portion for dislodging the balls from the ball rolling groove of the screw shaft and a direction switching passage for guiding the dislodged balls to the entrance of a ball return hole. The projecting return piece is divided into a first piece formed integral with the cover plate and a second piece fixed to the first piece by a curved plane including the center line of the direction switching passage.

Growing community of inventors

Tokyo, Japan

Akimasa Yoshida