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    • 55. 发明授权
    • Pneumatic tire including three asymmetrically arranged main grooves
    • 气动轮胎包括三个不对称布置的主槽
    • US6105644A
    • 2000-08-22
    • US13883
    • 1998-01-27
    • Akio Ikeda
    • Akio Ikeda
    • B60C11/04B60C11/03B60C11/11B60C11/113B60C111/00
    • B60C11/0304B60C11/0302
    • A pneumatic tire includes a tread portion provided with three straight main grooves extending continuously in the tire circumferential direction. The three main grooves are arranged asymmetrically about the tire equator such that an exterior main groove, which is one of the main grooves, is disposed in an exterior half, which is one half of the tread portion on one side of the tire equator. An axially inner main groove and an axially outer main groove, which are the remaining two main grooves, are disposed in an interior half which is the other half of the tread portion. Exterior oblique grooves are disposed axially outside the exterior main groove and inclined at an angle .theta. 1 of 45 to 70 degrees with respect to the circumferential direction of the tire. Interior oblique grooves are disposed axially outside the axially outer main groove and inclined reversely to the exterior oblique grooves at an angle .theta. 3 of 60 to 80 degrees with respect to the circumferential direction. Central oblique grooves are disposed between the exterior main groove and the axially inner main groove and inclined in the same direction as the exterior oblique grooves. Furthermore, between the exterior main groove and the axially inner main groove, the angle .theta. 2 of the central oblique grooves are in the range of 20 to 45 degrees with respect to the circumferential direction.
    • 充气轮胎包括:胎面部,其具有在轮胎周向上连续延伸的三个直的主槽。 三个主槽围绕轮胎赤道不对称地布置,使得作为主槽之一的外主槽设置在轮胎赤道的一侧上的胎面部的一半的外半部。 作为剩余的两个主槽的轴向内侧主槽和轴向外侧主槽设置在作为胎面部的另一半的内侧半部。 外倾斜槽轴向设置在外主槽的外侧,相对于轮胎的圆周方向倾斜角度θ为45度至70度。 内倾斜槽轴向设置在轴向外主槽的外侧,并相对于圆周方向以相对于外倾斜槽倾斜60度至80度的角度θ倾斜。 中心斜槽设置在外主槽和轴向内主槽之间,并且沿与外倾斜槽相同的方向倾斜。 此外,在主外槽和轴向内主槽之间,中心倾斜槽的角度θ2相对于圆周方向为20〜45度。
    • 56. 发明授权
    • Device for controlling the drilling direction of drill bit
    • 用于控制钻头钻孔方向的装置
    • US5875859A
    • 1999-03-02
    • US750138
    • 1997-01-31
    • Akio IkedaKoetsu Shano
    • Akio IkedaKoetsu Shano
    • E21B4/00E21B7/06E21B7/04
    • E21B7/067E21B4/003
    • A device for controlling the drilling direction of drills includes a cylinder-type housing 6, a first ring-formed component 11 which is located on an inner peripheral surface that is eccentric with respect to the cylinder-type housing 6, a second ring-formed component 12 which is located on the inner peripheral surface that is eccentric with respect to the circular inner surface of the first ring-formed component 11, and hollow-type harmonized reduction gears 13,14 which rotate the first and second ring-formed components 11,12 relatively around their respective centers. A resolver is positioned between the first and second ring-formed components 11,12 and the hollow-type harmonized reduction gears 13,14 to detect the rotating angular position of the first and second ring-formed components 11,12. A fulcrum bearing 8 of the rotating shaft 2 is located at a midpoint between the drill bit and the first and second ring formed components 11,12. A flexible joint 3 is located at the upper portion of the first and second ring-formed components 11,12 and a bearing 15 is further mounted on the flexible joint in order to support the rotating shaft 1.
    • PCT No.PCT / JP96 / 00187 Sec。 371日期1997年1月31日 102(e)日期1997年1月31日PCT提交1996年1月31日PCT公布。 出版物WO96 / 30616 PCT 日期1996年10月3日用于控制钻头的钻削方向的装置包括:圆筒型壳体6,位于相对于圆筒型壳体6偏心的内周面上的第一环形部件11, 位于相对于第一环形部件11的圆形内表面偏心的内周面上的第二环形部件12,以及中空型协调减速齿轮13,14,其使第一和第二 环形部件11,12相对地围绕它们各自的中心。 分解器位于第一和第二环形部件11,12和中空型协调减速齿轮13,14之间,以检测第一和第二环形部件11,12的旋转角度位置。 旋转轴2的支点轴承8位于钻头与第一和第二环形成部件11,12之间的中点处。 柔性接头3位于第一和第二环形部件11,12的上部,并且轴承15进一步安装在柔性接头上以支撑旋转轴1。