WO2019242572A1 - 传动轴 - Google Patents

传动轴 Download PDF

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Publication number
WO2019242572A1
WO2019242572A1 PCT/CN2019/091323 CN2019091323W WO2019242572A1 WO 2019242572 A1 WO2019242572 A1 WO 2019242572A1 CN 2019091323 W CN2019091323 W CN 2019091323W WO 2019242572 A1 WO2019242572 A1 WO 2019242572A1
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WO
WIPO (PCT)
Prior art keywords
transmission shaft
shaft
rotating shaft
transmission
connection end
Prior art date
Application number
PCT/CN2019/091323
Other languages
English (en)
French (fr)
Inventor
阎宁汉
谢建雄
Original Assignee
益航电子股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 益航电子股份有限公司 filed Critical 益航电子股份有限公司
Publication of WO2019242572A1 publication Critical patent/WO2019242572A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/48—Spanners; Wrenches for special purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/02—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H2057/02039—Gearboxes for particular applications
    • F16H2057/02069—Gearboxes for particular applications for industrial applications

Definitions

  • the present invention relates to a transmission shaft, and more particularly to a transmission shaft applied to a hand-held tool.
  • a hand-held tool is composed of a motor, a transmission mechanism, a tool piece, and a housing.
  • the transmission mechanism includes a gear set or a worm gear and a transmission shaft, which are used to cooperate with the motor to drive the tool piece.
  • hand tools such as a grinder will press a tool piece against a workpiece during use, and the pressure generated at this time is applied to a gear set or a worm gear through a transmission shaft, increasing the friction between components, and Therefore, the operation of the motor and the transmission mechanism is hindered, so that the efficiency of the hand tool is reduced.
  • the positions of the two ends of the transmission shaft are fixed during the assembly of the hand tool, if there is an error in the fixed positions of the two ends, the integrally formed transmission shaft cannot rotate smoothly in the prior art. Therefore, how to provide a transmission shaft that can prevent pressure from interfering with the operation of the motor and the transmission mechanism, and can tolerate a large error during assembly, has become an urgent issue for the industry.
  • an object of the present invention is to provide a transmission shaft that can prevent pressure from interfering with the operation of the motor and the transmission mechanism, and can tolerate large errors during assembly.
  • the transmission shaft of the present invention includes a first rotation shaft and a second rotation shaft.
  • the first rotating shaft has a first connecting end; and the second rotating shaft has a second connecting end, wherein the first connecting end is used to drive the second connecting end to rotate the second rotating shaft when the first rotating shaft is rotated.
  • first rotating shaft and the second rotating shaft are not in direct contact on a plane perpendicular to the axis.
  • one of the first connection end and the second connection end is a convex structure, and the other is a concave structure corresponding to the shape.
  • the transmission shaft further includes a planetary gear carrier disposed on the first rotating shaft.
  • the transmission shaft further includes a first housing for abutting the planetary gear carrier.
  • the transmission shaft further includes a worm gear or a gear, and is connected to the first rotating shaft.
  • the transmission shaft further includes a planetary gear, which is connected to the worm gear or the gear.
  • the transmission shaft further includes a bearing connected to the second rotating shaft.
  • the transmission shaft further includes a second housing connected to the bearing.
  • the transmission shaft further includes a third housing connected to the other end of the first rotating shaft opposite to the first connection end.
  • the second rotating shaft further includes a slot disposed at the other end opposite to the second connecting end.
  • the transmission shaft of the present invention includes a first rotation shaft and a second rotation shaft, wherein the first connection end of the first rotation shaft is used to drive the second rotation shaft when the first rotation shaft rotates.
  • the second connecting end of the second shaft allows the second rotating shaft to rotate. Therefore, the transmission shaft of the present invention can tolerate a larger error in assembly (compared to an integrally formed transmission shaft). Because the first shaft and the second shaft are not in direct contact on a plane perpendicular to the axis, the pressure on the second shaft will not be directly applied to the first shaft connected to the power source, so it will not affect the transmission shaft or Operation of power sources.
  • a first housing or a third housing can be added to maintain the position of the first rotating shaft, or a bearing and a second housing can be added to maintain the position of the second rotating shaft, so that the effect of avoiding the influence of pressure can be improved.
  • FIG. 1 is a schematic structural diagram of a transmission shaft according to a first embodiment of the present invention.
  • FIG. 2 is a schematic perspective view of a first connection end and a second connection end according to a second embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a transmission shaft according to a third embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a first rotating shaft according to a fourth embodiment of the present invention.
  • FIG. 1 is a schematic structural diagram of a transmission shaft according to a first embodiment of the present invention.
  • the transmission shaft of the present invention includes a first rotation shaft 1 and a second rotation shaft 2.
  • the transmission shaft of the invention is mainly used in the field of hand-held tools.
  • the first rotating shaft 1 has a first connection end 10 and is indirectly connected to a power source (such as a motor) through other transmission components.
  • the second rotating shaft 2 has a second connection end 20 and directly or indirectly connects a tool member (such as a grinding disc or a drill, etc.).
  • the first connecting end 10 drives the second connecting end 20 to rotate the second rotating shaft 2.
  • the shapes of the first connection end 10 and the second connection end 20 must correspond to each other.
  • the first connection end 10 may be a concave structure
  • the second connection end 20 may be a convex structure with opposite shapes. , But not limited to this.
  • the positions of the two ends of the transmission shaft are fixed during assembly. If there is an error in the fixed positions of the two ends and the shaft center deviates, the integrally formed transmission shaft cannot rotate smoothly in the prior art.
  • the two ends of the transmission shaft of the present invention are the first rotation shaft 1 and the second rotation shaft 2, respectively. Even if there is an error in the fixed positions of the two ends, the first rotation shaft 1 and the second rotation shaft 2 can still rotate independently, as long as the first connection end 10 can drive the first The two connecting ends 20 are sufficient. In other words, the transmission shaft of the present invention can tolerate a large error in assembly.
  • the axes of the first rotation axis 1 and the second rotation axis 2 are on the same axis line O, wherein the planes A1, A2 perpendicular to the first rotation axis 1 and the axis O, and the second rotation axis 2 and the axis center O vertical planes A3 and A4 are not in direct contact.
  • a gap is left between the first rotation shaft 1 and the second rotation shaft 2 on the plane A1, A3 and between the planes A2 and A4, and there is no direct contact.
  • the first rotation shaft 1 and the second rotation shaft 2 are only on the shaft.
  • the substantially parallel planes of the center O direction will contact each other.
  • the second rotating shaft 2 of the transmission shaft is subject to pressure in the direction of the axis O.
  • the first rotating shaft 1 and the second rotating shaft 2 are on a plane A1, A2, A3, A4 perpendicular to the shaft center O It is not in direct contact, so the first rotating shaft 1 is not subject to pressure in the direction of the axis O, which can prevent the pressure in the direction of the axis O from increasing the friction between the components and hinder the operation of the transmission shaft or power source.
  • FIG. 2 is a schematic perspective view of a first connection end and a second connection end according to a second embodiment of the present invention.
  • the first connection end 10 may be a convex structure
  • the second connection end 20 is a concave structure corresponding to the shape, but is not limited thereto.
  • the first connection end 10 may be It is a concave structure
  • the second connection end 20 is a convex structure corresponding to the shape.
  • FIG. 3 is a schematic structural diagram of a transmission shaft according to a third embodiment of the present invention.
  • the transmission shaft further includes a planetary gear carrier 3 disposed on the first rotating shaft 1.
  • the planetary gear carrier 3 may be in the shape of a disc, sleeved on the first rotating shaft 1 or integrally formed with the first rotating shaft 1.
  • the transmission shaft further includes a first housing 4 for abutting the planetary gear carrier 3.
  • the first housing 4 may be a part of a hand tool housing, and the first housing 4 may be used to maintain the position of the first rotary shaft 1 to avoid the influence of the pressure in the direction of the axis O.
  • the transmission shaft further includes a bearing 5 connected to the second rotating shaft 2.
  • the transmission shaft further includes a second housing 6 connected to the bearing 5.
  • the second housing 6 may be a part of the housing of the hand tool, and the bearings 5 and the second housing 6 may be used to maintain the position of the second rotating shaft 2 to avoid the pressure in the direction of the axis O from affecting the first rotating shaft 1.
  • the transmission shaft further includes a third housing 9 connected to the other end of the first rotating shaft 1 opposite to the first connection end 10.
  • the third housing 9 may be a part of the hand tool housing and may be used to maintain the position of the first rotating shaft 1.
  • the position of the first rotating shaft 1 can be fixed by the first housing 4 and the third housing 9, and the bearing 5 and the second housing 6 can be fixed at the first position.
  • the position of the two rotating shafts 2 keeps the relative positions of the first rotating shaft 1 and the second rotating shaft 2 in the direction of the axis O to prevent the first rotating shaft 1 and the second rotating shaft 2 from directly contacting each other on a plane perpendicular to the axis O In this way, the pressure in the direction of the axis O will only be applied to the second rotating shaft 2 and not to the first rotating shaft 1. Therefore, the operation of the transmission shaft or the power source will not be hindered.
  • FIG. 4 is a schematic structural diagram of a first rotating shaft according to a fourth embodiment of the present invention.
  • the transmission shaft further includes a worm wheel 7 or a gear (not shown), and is connected to the first rotating shaft 1.
  • the worm wheel 7 or the gear can be used to connect with other transmission components, for example, it can be connected with a worm or other gear, and can be linked with a power source to drive the first rotating shaft 1 to rotate.
  • the transmission shaft further includes a planetary gear 8, which is connected to the worm gear 7 or a gear and is mounted on the planetary gear carrier 3.
  • the second rotating shaft further includes a slot 21 disposed at the other end opposite to the second connection end 20.
  • the slot 21 may be used to connect a tool (such as a grinding disc or a drill, etc.), and may have internal threads or fixing members, etc., for fixing the tool.
  • the transmission shaft of the present invention includes a first rotation shaft and a second rotation shaft, wherein the first connection end of the first rotation shaft is used to drive the second connection end of the second rotation shaft to make the first rotation shaft when the first rotation shaft rotates.
  • the two rotating shafts rotate, so the transmission shaft of the present invention can tolerate a large error in assembly (compared to the integrally formed transmission shaft). Because the first shaft and the second shaft are not in direct contact on a plane perpendicular to the axis, the pressure on the second shaft will not be directly applied to the first shaft connected to the power source, so it will not affect the transmission shaft or Operation of power sources.
  • a first housing or a third housing can be added to maintain the position of the first rotating shaft, or a bearing and a second housing can be added to maintain the position of the second rotating shaft, so that the effect of avoiding the influence of pressure can be improved.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gear Transmission (AREA)

Abstract

一种传动轴包括第一转轴（1）以及第二转轴（2）。第一转轴（1）具有第一连接端（10）；以及第二转轴（2）具有第二连接端（20），其中，第一连接端（10）用以在第一转轴（1）旋转时，带动第二连接端（20）以令第二转轴（2）旋转。

Description

传动轴 技术领域
本发明涉及传动轴，尤指一种应用于手持工具的传动轴。
背景技术
一般而言，手持工具是由马达、传动机构、工具件以及外壳等组件所构成，其中，传动机构包括齿轮组或蜗轮蜗杆以及传动轴等，用以配合马达以带动工具件。
在现有技术中，打磨机等手持工具在使用上会将工具件按压在加工物上，此时所产生的压力通过传动轴施加在齿轮组或蜗轮蜗杆上，增加组件间的摩擦力，并因此妨碍马达以及传动机构的运作，使得手持工具的效率降低。此外，由于在手持工具组装时会固定传动轴两端的位置，若两端的固定位置有误差，现有技术中一体成型的传动轴将无法顺利旋转。因此，如何能提供一种能避免压力妨碍马达以及传动机构的运作，并在组装时能容许较大误差的传动轴，遂成为业界亟待解决的课题。
发明内容
鉴于现有技术的种种缺失，本发明的一目的，即在于提供一种能避免压力妨碍马达以及传动机构的运作，并在组装时能容许较大误差的传动轴。
为了达到前述目的，本发明的传动轴包括第一转轴以及第二转轴。第一转轴具有第一连接端；以及第二转轴具有第二连接端，其中，第一连接端用以在第一转轴旋转时，带动第二连接端以令第二转轴旋转。
在一实施例中，第一转轴与第二转轴在与轴心垂直的平面上未直接接触。
在一实施例中，第一连接端及第二连接端其中一者为凸型结构，另一者为形状对应的凹型结构。
在一实施例中，传动轴还包括行星齿轮架，设置于第一转轴。
在一实施例中，传动轴还包括第一壳体，用以抵顶行星齿轮架。
在一实施例中，传动轴还包括蜗轮或齿轮，与第一转轴连接。
在一实施例中，传动轴还包括行星齿轮，与蜗轮或齿轮连接。
在一实施例中，传动轴还包括轴承，与第二转轴连接。
在一实施例中，传动轴还包括第二壳体，与轴承连接。
在一实施例中，传动轴还包括第三壳体，与第一转轴的相对第一连接端的另一端连接。
在一实施例中，第二转轴还包括插槽，设置于相对第二连接端的另一端。
相较于现有技术中一体成型的传动轴，本发明的传动轴包括第一转轴以及第二转轴，其中，第一转轴的第一连接端用以在第一转轴旋转时，带动第二转轴的第二连接端以令第二转轴旋转，故本发明的传动轴在组装上能容许较大的误差(相较于一体成型的传动轴)。又因为第一转轴与第二转轴在与轴心垂直的平面上未直接接触，因此第二转轴所受到的压力不会直接施加在连接动力来源的第一转轴，故不会影响传动轴或是动力来源的运作。除此之外，还可以附加第一壳体或第三壳体来维持第一转轴的位置，或是附加轴承与第二壳体来维持第二转轴的位置，以令避免压力影响的功效更进一步。
附图说明
图1为本发明第一实施例的传动轴的架构示意图。
图2为本发明第二实施例的第一连接端及第二连接端的立体示意图。
图3为本发明第三实施例的传动轴的架构示意图。
图4为本发明第四实施例的第一转轴的架构示意图。
符号说明：
1        第一转轴
10       第一连接端
2        第二转轴
20       第二连接端
21       插槽
3        行星齿轮架
4        第一壳体
5        轴承
6        第二壳体
7        蜗轮
8        行星齿轮
9        第三壳体
A1～A4   与轴心垂直的平面
O        轴心
具体实施方式
以下藉由特定的具体实施例说明本发明的实施方式，熟悉此技术的人士可由本说明书所揭示的内容轻易地了解本发明的其他优点与功效。本发明亦可藉由其他不同的具体实施例加以施行或应用。
请参阅图1，其为本发明第一实施例的传动轴的架构示意图。如图所示，本发明的传动轴包括第一转轴1以及第二转轴2。本发明的传动轴主要应用在手持工具领域。
在一实施例中，第一转轴1具有第一连接端10，并通过其他传动组件间接连接至动力来源(例如马达)。第二转轴2具有第二连接端20，并且直接或间接连接工具件(例如磨盘或 钻头等等)。
当第一转轴1旋转时，第一连接端10带动第二连接端20而使得第二转轴2旋转。为达成此目的，第一连接端10以及第二连接端20的形状必须互相对应，举例来说，第一连接端10可为凹型结构，以及第二连接端20可为形状相对的凸型结构，但不以此为限。
一般而言，在组装时会固定传动轴两端的位置，若两端的固定位置有误差从而导致轴心偏离，现有技术中一体成型的传动轴将无法顺利旋转。本发明的传动轴两端分别是第一转轴1以及第二转轴2，即使两端的固定位置有误差，第一转轴1与第二转轴2仍可各自旋转，只要第一连接端10可带动第二连接端20即可，换句话说，本发明的传动轴在组装上可容许较大的误差。
在一实施例中，第一转轴1与第二转轴2的轴心在同一轴心线O上，其中，第一转轴1与轴心O垂直的平面A1、A2以及第二转轴2与轴心O垂直的平面A3、A4并未直接接触。如图1所示，第一转轴1与第二转轴2在平面A1、A3以及在平面A2、A4之间都留有空隙，并未直接接触，第一转轴1与第二转轴2间仅在轴心O方向概略平行的平面会彼此接触。在使用手持工具时，传动轴的第二转轴2会受到轴心O方向的压力，然而，由于第一转轴1与第二转轴2在与轴心O垂直的平面A1、A2、A3、A4上未直接接触，因此对于第一转轴1而言不会受到轴心O方向的压力，可避免轴心O方向的压力增加组件间的摩擦力而妨碍传动轴或是动力来源的运作。
请参阅图2，其为本发明第二实施例的第一连接端及第二连接端的立体示意图。在一实施例中，第一连接端10可为凸型结构，以及第二连接端20为形状对应的凹型结构，但不以此为限，在其它的实施例中，第一连接端10可为凹型结构，以及第二连接端20为形状对应的凸型结构。
请参阅图3，其为本发明第三实施例的传动轴的架构示意图。在一实施例中，传动轴还包括行星齿轮架3，设置于第一转轴1。举例来说，行星齿轮架3可为圆盘形状，套设于 第一转轴1或与第一转轴1一体成型。
在一实施例中，传动轴还包括第一壳体4，用以抵顶行星齿轮架3。举例来说，第一壳体4可为手持工具外壳的一部分，第一壳体4可用于维持第一转轴1的位置，以避免轴心O方向的压力影响。
在一实施例中，传动轴还包括轴承5，与第二转轴2连接。
在一实施例中，传动轴还包括第二壳体6，与轴承5连接。举例来说，第二壳体6可为手持工具外壳的一部分，轴承5与第二壳体6可用于维持第二转轴2的位置，以避免轴心O方向的压力影响第一转轴1。
在一实施例中，传动轴还包括第三壳体9，与第一转轴1的相对第一连接端10的另一端连接。举例来说，第三壳体9可为手持工具外壳的一部分，可用于维持第一转轴1的位置。
进一步而言，当手持工具运作时会产生轴心O方向的压力，但可通过第一壳体4及第三壳体9固定第一转轴1的位置，轴承5及第二壳体6固定第二转轴2的位置，从而使第一转轴1与第二转轴2在轴心O方向的相对位置维持固定，以避免第一转轴1与第二转轴2在与轴心O垂直的平面上直接接触，如此轴心O方向的压力仅会施加于第二转轴2而不会施加于第一转轴1，故不会妨碍传动轴或是动力来源的运作。
请参阅图4，其为本发明第四实施例的第一转轴的架构示意图。在一实施例中，传动轴还包括蜗轮7或齿轮(未图示)，与第一转轴1连接。蜗轮7或齿轮可用于与其他传动组件连接，例如与蜗杆或其他齿轮连接，并与动力来源连动以带动第一转轴1旋转。
在一实施例中，传动轴还包括行星齿轮8，与蜗轮7或齿轮连接，并装设于行星齿轮架3上。
如图3所示，在一实施例中，第二转轴还包括插槽21，设置于相对第二连接端20的另一端。插槽21可用于连接工具件(例如磨盘或钻头等等)，并可具有内螺纹或固定件等等，用以固定工具件。
综上所述，本发明的传动轴包括第一转轴以及第二转轴，其中，第一转轴的第一连接端用以在第一转轴旋转时，带动第二转轴的第二连接端以令第二转轴旋转，故本发明的传动轴在组装上能容许较大的误差(相较于一体成型的传动轴)。又因为第一转轴与第二转轴在与轴心垂直的平面上未直接接触，因此第二转轴所受到的压力不会直接施加在连接动力来源的第一转轴，故不会影响传动轴或是动力来源的运作。除此之外，还可以附加第一壳体或第三壳体来维持第一转轴的位置，或是附加轴承与第二壳体来维持第二转轴的位置，以令避免压力影响的功效更进一步。
藉由以上较佳具体实施例的描述，本领域具有通常知识者当可更加清楚本发明的特征与精神，惟上述实施例仅为说明本发明的原理及其功效，而非用以限制本发明。因此，任何对上述实施例进行的修改及变化仍不脱离本发明的精神，且本发明的权利范围应如权利要求书所列。

Claims (11)

  1. 一种传动轴，其特征在于，所述传动轴包括：
    第一转轴，具有第一连接端；以及
    第二转轴，具有第二连接端，其中，
    所述第一连接端用以在所述第一转轴旋转时，带动所述第二连接端以令所述第二转轴旋转。
  2. 如权利要求1所述的传动轴，其特征在于，所述第一转轴与所述第二转轴在与轴心垂直的平面上未直接接触。
  3. 如权利要求1所述的传动轴，其特征在于，所述第一连接端及所述第二连接端其中一者为凸型结构，另一者为形状对应的凹型结构。
  4. 如权利要求1所述的传动轴，其特征在于，所述传动轴还包括行星齿轮架，设置于所述第一转轴。
  5. 如权利要求4所述的传动轴，其特征在于，所述传动轴还包括第一壳体，用以抵顶所述行星齿轮架。
  6. 如权利要求4所述的传动轴，其特征在于，所述传动轴还包括蜗轮或齿轮，与所述第一转轴连接。
  7. 如权利要求6所述的传动轴，其特征在于，所述传动轴还包括行星齿轮，与所述蜗轮或齿轮连接。
  8. 如权利要求1所述的传动轴，其特征在于，所述传动轴还包括轴承，与所述第二转轴连接。
  9. 如权利要求8所述的传动轴，其特征在于，所述传动轴还包括第二壳体，与所述轴承连接。
  10. 如权利要求1所述的传动轴，其特征在于，所述传动轴还包括第三壳体，与所述第一转轴的相对所述第一连接端的另一端连接。
  11. 如权利要求1所述的传动轴，其特征在于，所述第二转轴还包括插槽，设置于相对所述第二连接端的另一端。
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