CN103502659A - 自攻螺钉 - Google Patents

自攻螺钉 Download PDF

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CN103502659A
CN103502659A CN201180070440.9A CN201180070440A CN103502659A CN 103502659 A CN103502659 A CN 103502659A CN 201180070440 A CN201180070440 A CN 201180070440A CN 103502659 A CN103502659 A CN 103502659A
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tooth
threads
screw threads
regular screw
tapping screw
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CN103502659B (zh
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鸟居慎吾
横田正典
阿部正德
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Nitto Seiko Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00—Features common to bolt and nut
    • F16B33/02—Shape of thread; Special thread-forms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0057—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0015—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a soft organic material, e.g. wood or plastic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0021—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being metal, e.g. sheet-metal or aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0047—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the ridge being characterised by its cross-section in the plane of the shaft axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0073—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw characterised by its pitch, e.g. a varying pitch

Abstract

本发明提供一种最适合拧紧树脂制、铝合金制等软质材料制成的工件的自攻螺钉。本发明的自攻螺钉（1）包含普通螺纹牙（10）以及比所述普通螺纹牙（10）直径大的内螺纹成型螺纹牙（12），在位于比所述内螺纹成型螺纹牙（12）更靠近头部侧的所述普通螺纹牙（10）的螺距中，设定某些螺距大于其它螺距。所述自攻螺钉（1）可以同时实现驱动力矩的降低以及连结力的提高，能够适用于从软质材料到硬质材料的各种工件。

Description

自攻螺钉
技术领域
本发明涉及一种向铝合金制、镁合金制或者树脂制等软质材料制成的工件中安装部件用的螺钉，尤其涉及能够在这样的软质材料制成的工件中形成的没有螺纹的导孔中，在成型内螺纹的同时拧紧螺钉的自攻螺钉。
背景技术
近年来普及较多的手机，手提电脑以及便携式音乐播放器等电器产品中，从其轻重量化、小型化以及加工性良好来看多使用铝合金制成。在其上安装部件需要使用很多的螺钉。
因此，专利第4490358号公报公开的自攻螺钉便是上述螺钉的一例。这种自攻螺钉，包含在脚部成型的普通螺纹牙以及比所述普通螺纹牙直径大的内螺纹成型螺纹牙，通过所述内螺纹成型螺纹牙使内螺纹成型的同时拧紧工件。此外，普通螺纹牙的螺距全部都设定地相同。通过这种结构，在连结旋转时，由于内螺纹牙中普通螺纹牙的两侧面（flank）不接触，所以在降低拧紧力矩的同时，还能够防止破坏工件。
（在先技术文献）
专利文献
专利文献1：专利第4490358号公报
发明内容
（发明要解决的问题）
然而，所述自攻螺钉中作为其构成的代价，在连结固定时内螺纹牙中普通螺纹牙的任何一个侧面均不接触，所以无法得充分的连结力，容易松动。
（解决问题的方法）
在脚部形成普通螺纹牙以及比所述普通螺纹牙直径大的内螺纹成型螺纹牙的自攻螺钉中，在比所述内螺纹成型螺纹牙更靠近头部侧的所述普通螺纹牙的螺距中，设定某些螺距大于其它螺距。
根据这样的自攻螺钉，普通螺纹牙的压力侧侧面和内螺纹牙的压力侧侧面的距离，比普通螺纹牙的游隙侧侧面和内螺纹牙的游隙侧侧面的距离更接近。然而，连结旋转时，普通螺纹牙向连结方向一边按压一边拧紧，因此普通螺纹牙的压力侧侧面与内螺纹牙的压力侧侧面的接触阻力很小。另一方面，连结固定时通过轴向力的作用，普通螺纹牙的压力侧侧面靠近并接触内螺纹牙的压力侧侧面，所以连结力得到提高。因此，本发明的自攻螺钉同时具备驱动力矩的降低以及连结力的提高的优点。因此即使用于铝合金制、树脂制等软质材料制成的工件时也不会产生裂痕，而且可以发挥充分的连结力。
此外，优选设定为使所述普通螺纹牙的压力侧侧面角（flank angle）小于所述内螺纹成型螺纹牙的压力侧侧面角。
通过这样的自攻螺钉，在连结固定时所述普通螺纹牙的顶部嵌进所述内螺纹牙的压力侧侧面，所以可以期待连结力的进一步提高。
（发明的效果）
本发明的自攻螺钉，通过驱动力矩的降低以及连结力的提高，可以适用于从软质材料到硬质材料的所有工件。
附图说明
图1是表示本发明的实施方式的整体图。
图2是表示本发明的连结旋转状态的一部分放大的断面图。
图3是表示本发明的连结固定状态的一部分放大的断面图。
图4是表示本发明的第2实施方式中连结旋转状态的一部分放大的断面图。
图5是表示本发明的第2实施方式中连结固定状态的一部分放大的断面图。
图6是表示本发明的第3实施方式的一部分放大的断面图。
（附图标记说明）
1   自攻螺钉
2   头部
3   脚部
4   驱动孔
5   座面
10  普通螺纹牙
10a 压力侧侧面
10b 游隙侧侧面
11  导引螺纹牙
12  内螺纹成型螺纹牙
13  内螺纹牙
13a 压力侧侧面
13b 游隙侧侧面
14  内螺纹
20  工件
21  导孔
具体实施方式
以下，将根据图1至图3对本发明的第1实施方式进行说明。图1中，1为头部2及与之一体形成的脚部3构成的自攻螺钉，由碳钢，不锈钢等的硬质材料构成。头部2中，形成螺杆驱动力从螺丝刀位（没有图示）传达至螺钉1的驱动孔4。在所述头部2中一体形成的所述脚部3中，普通螺纹牙10从头部2的座面5的附近向脚部末梢的位置方向螺旋状延伸。
另一方面，比所述普通螺纹牙10直径小的导引螺纹牙11在所述脚部3的末梢侧成型。设定所述导引螺纹牙11的直径与形成于工件20的导孔21的直径相同或稍大一些。另外，工件20由树脂制、铝合金制等软质材料构成。
此外，所述普通螺纹牙10与导引螺纹牙11之间形成比普通螺纹牙部10直径大的内螺纹成型螺纹牙12。这些普通螺纹牙10、内螺纹成型螺纹牙12以及导引螺纹牙11连续相接在脚部使螺纹牙成型。
如图2所示，通过内螺纹成型螺纹牙12成型的内螺纹14的谷底的螺距（P），是由内螺纹成型螺纹牙12和导引螺纹牙11的顶部的螺距（P）决定的。此外，位于与内螺纹成型螺纹牙12相比更靠头部侧的普通螺纹牙10的顶部的螺距（P），与内螺纹14的谷底的螺距（P）同样设定。但是，内螺纹成型螺纹牙12的顶部，与与之相接的普通螺纹牙10之间的顶部的螺距（P’），设定为比其它的普通螺纹牙10的顶部的螺距（P）要大。这样，由于普通螺纹牙10与内螺纹14产生偏差，普通螺纹牙10的顶部设置在向内螺纹牙13的压力侧侧面13a的位置方向偏离的位置。通过这种构成，普通螺纹牙10的压力侧侧面10a与内螺纹牙的压力侧侧面13a之间的距离，比普通螺纹牙10的游隙侧侧面10b与内螺纹牙13的游隙侧侧面13b之间的距离更接近。
此外，普通螺纹牙10以及内螺纹牙成型螺纹牙12的游隙侧侧面角（α）大，压力侧侧面角（β）小，呈非对称形状，形成的内螺纹成型螺纹牙12的侧面角只比普通螺纹牙10的每个侧面角大（θ）角度。
上述自攻螺钉1，如图2所示在连结旋转阶段，一边向箭头Y1方向施加推力一边拧紧。因此，尽管普通螺纹牙10的顶部或者压力侧侧面10a稍微接触内螺纹牙13的压力侧侧面13a，但其接触阻力很小，驱动力矩不会变高。另外，在连结旋转阶段，其构成也可以是普通螺纹牙10的顶部或者压力侧侧面10a不接触内螺纹13的压力侧侧面13a的程度。
另一方面，如图3所示，在连结固定阶段，通过作用于自攻螺钉1的轴向力，自攻螺钉1中向箭头Y2方向施加压力，内螺纹中向与之相反的方向的箭头Y3的方向施加压力。因此，连结固定阶段普通螺纹牙10的顶部或者压力侧侧面10a与内螺纹牙13的压力侧侧面13a比在连结旋转阶段接触时靠得更近。所以能够得到接触阻力高而且强有力的连接力。特别是通过将普通螺纹牙10以及内螺纹成型螺纹牙12侧面角设定为前面所述的角，在连结固定阶段普通螺纹牙10的顶部嵌入内螺纹牙13的压力侧侧面13a，与面与面相互之间的接触相比连接力得到提高。
以下，根据图4以及图5对本发明的第2实施方式进行说明。通过第2实施方式表示的自攻螺钉51中，对于通过第1实施方式表示的自攻螺钉1其螺距的设定不相同。如图4所示，内螺纹成型螺纹牙62的顶部和与之相邻的普通螺纹牙60的顶部的螺距（P），与内螺纹64的谷底的螺距（P）同样设定。另一方面，位于头部侧的普通螺纹牙60A的顶部的螺距（P’）设定为大于内螺纹64的谷底的螺距（P）。
这样，由于自攻螺钉51在图4所示的连结旋转阶段包含对于内螺纹牙63的压力侧侧面63a接触的普通螺纹牙60以及不接触的普通螺纹牙60A，所以与第1实施方式的自攻螺钉1相比，驱动力矩更低。另一方面，如果在如图5所示的连结固定阶段轴向力发生作用，则普通螺纹牙60A对于内螺纹牙63的压力侧侧面63a接触时靠得更近，但是普通螺纹牙60A与内螺纹成型螺纹牙62之间的区间的普通螺纹牙60即使轴向力发生作用顶部或者压力侧侧面60a也不接触内螺纹牙63的压力侧侧面63a，因此与第1实施方式的自攻螺钉1相比连结力低。
如上所述，通过根据工件的材质分开使用第1实施方式以及第2实施方式所示的自攻螺钉1，51，可以得到最优的驱动力矩或连结力。
以下，根据图6对本发明的第3实施方式进行说明。该自攻螺钉100的普通螺纹牙110呈台阶形状。这种情况下，普通螺纹牙110的螺距的基准线以位于所述普通螺纹牙110的上底中内螺纹牙113的压力侧侧面113a的顶点为基准进行设定。
此外，通过梯形形状的内螺纹成型螺纹牙112成型的内螺纹114的谷底是平面，这种情况下，内螺纹114的谷底的螺距线以位于内螺纹牙113的压力侧侧面113a的端点为基准进行设定。

Claims (2)

1.一种自攻螺钉，在脚部形成普通螺纹牙以及比所述普通螺纹牙直径大的内螺纹成型螺纹牙，其特征在于，
在位于比所述内螺纹成型螺纹牙更靠近头部侧的所述普通螺纹牙的螺距中，设定某些螺距大于其它的螺距。
2.根据权利要求1所述的自攻螺钉，其特征在于，
设定为使所述普通螺纹牙的压力侧侧面角小于所述内螺纹成型螺纹牙的压力侧侧面角。
CN201180070440.9A 2011-04-28 2011-04-28 自攻螺钉 Active CN103502659B (zh)

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MY (1) MY160088A (zh)
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CN103502659B (zh) 2015-05-20
EP2703658A1 (en) 2014-03-05
BR112013027513B1 (pt) 2020-03-31
JP5122686B2 (ja) 2013-01-16
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BR112013027465A2 (pt) 2017-09-19

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