Processing

Please wait...

Settings

Settings

Goto Application

1. WO2018147229 - BALL SCREW DEVICE AND ELECTRIC POWER STEERING DEVICE

Publication Number WO/2018/147229
Publication Date 16.08.2018
International Application No. PCT/JP2018/003820
International Filing Date 05.02.2018
IPC
F16H 25/22 2006.1
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
HGEARING
25Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
18for conveying or interconverting oscillating or reciprocating motions
20Screw mechanisms
22with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
B62D 5/04 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
DMOTOR VEHICLES; TRAILERS
5Power-assisted or power-driven steering
04electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
F16H 25/24 2006.1
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
HGEARING
25Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
18for conveying or interconverting oscillating or reciprocating motions
20Screw mechanisms
24Elements essential to such mechanisms, e.g. screws, nuts
CPC
B62D 5/0448
BPERFORMING OPERATIONS; TRANSPORTING
62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
DMOTOR VEHICLES; TRAILERS
5Power-assisted or power-driven steering
04electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
0442Conversion of rotational into longitudinal movement
0445Screw drives
0448Ball nuts
F16H 25/22
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
HGEARING
25Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
18for conveying or interconverting oscillating or reciprocating motions
20Screw mechanisms
22with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
F16H 25/2219
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
HGEARING
25Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
18for conveying or interconverting oscillating or reciprocating motions
20Screw mechanisms
22with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
2204with balls
2214with elements for guiding the circulating balls
2219Axially mounted end-deflectors
F16H 25/24
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
HGEARING
25Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
18for conveying or interconverting oscillating or reciprocating motions
20Screw mechanisms
24Elements essential to such mechanisms, e.g. screws, nuts
Applicants
  • 日本精工株式会社 NSK Ltd. [JP]/[JP]
Inventors
  • 萬 雄介 YOROZU, Yusuke
Agents
  • 特許業務法人酒井国際特許事務所 SAKAI INTERNATIONAL PATENT OFFICE
Priority Data
2017-02417413.02.2017JP
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) BALL SCREW DEVICE AND ELECTRIC POWER STEERING DEVICE
(FR) DISPOSITIF DE VIS À BILLES ET DISPOSITIF DE DIRECTION ASSISTÉE ÉLECTRIQUE
(JA) ボールねじ装置及び電動パワーステアリング装置
Abstract
(EN) A ball screw device according to the present invention includes a screw shaft, a nut, a plurality of balls, and an end deflector. The screw shaft has a first screw groove in the outer circumferential surface. The nut includes a second screw groove provided in the inner circumferential surface, a cut-away portion provided in an end face, and a return hole provided in the bottom surface of the cut-away portion, which is perpendicular to the shaft direction of the screw shaft, so as to penetrate in the shaft direction. The plurality of balls roll between the first screw groove and the second screw groove. The end deflector fits in the cut-away portion. The nut has a curved section in the side surface of the cut-away portion, at a position between the second screw groove and the return hole. In a first section of the nut taken along a plane perpendicular to the shaft direction and passing through the second screw groove and the cut-away portion, the curved section includes an arc section centered at a point located on the outer side of the second screw groove in the radial direction centered at the rotation shaft of the nut.
(FR) Un dispositif de vis à billes selon la présente invention comprend une tige filetée, un écrou, une pluralité de billes et un déflecteur d'extrémité. La tige filetée présente une première rainure filetée dans la surface circonférentielle extérieure. L'écrou comprend une seconde rainure filetée disposée dans la surface circonférentielle intérieure, une partie découpée disposée dans une face d'extrémité, et un trou de retour disposé dans la surface inférieure de la partie découpée, qui est perpendiculaire à la direction de tige de la tige filetée, de façon à pénétrer dans la direction de tige. La pluralité de billes roulent entre la première rainure filetée et la seconde rainure filetée. Le déflecteur d'extrémité s'ajuste dans la partie découpée. L'écrou comporte une section incurvée dans la surface latérale de la partie découpée, dans une position entre la seconde rainure filetée et le trou de retour. Dans une première section de l'écrou prise le long d'un plan perpendiculaire à la direction de tige et traversant la seconde rainure filetée et la partie découpée, la section incurvée comprend une section d'arc centrée au niveau d'un point situé sur le côté extérieur de la seconde rainure filetée dans la direction radiale centrée au niveau de la tige de rotation de l'écrou.
(JA) ボールねじ装置は、ねじ軸と、ナットと、複数のボールと、エンドデフレクタと、を備える。ねじ軸は、外周面に第1ねじ溝を有する。ナットは、内周面に設けられる第2ねじ溝、端面に設けられる切欠き、及びねじ軸の軸方向に対して直交する切欠きの底面に設けられ且つ軸方向に貫通する戻し穴を有する。複数のボールは、第1ねじ溝と第2ねじ溝との間を転がる。エンドデフレクタは、切欠きに嵌まる。ナットは、切欠きの側面のうち第2ねじ溝と戻し穴との間の位置に曲面部を備える。軸方向に対して直交し且つ第2ねじ溝及び切欠きを通る平面でナットを切った第1断面において、曲面部は、ナットの回転軸を中心とした放射方向で第2ねじ溝よりも外側に位置する点を中心とした円弧を描く部分を含む。
Latest bibliographic data on file with the International Bureau