WO2014032433A1 - 一种消除蜗轮蜗杆啮合间隙且增大输出力矩的装置 - Google Patents

一种消除蜗轮蜗杆啮合间隙且增大输出力矩的装置 Download PDF

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WO2014032433A1
WO2014032433A1 PCT/CN2013/074422 CN2013074422W WO2014032433A1 WO 2014032433 A1 WO2014032433 A1 WO 2014032433A1 CN 2013074422 W CN2013074422 W CN 2013074422W WO 2014032433 A1 WO2014032433 A1 WO 2014032433A1
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Prior art keywords
worm wheel
arm
worm
wheel piece
main
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PCT/CN2013/074422
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English (en)
French (fr)
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陆启湘
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Lu Qixiang
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Publication of WO2014032433A1 publication Critical patent/WO2014032433A1/zh

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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
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/17—Toothed wheels
    • F16H55/18—Special devices for taking up backlash
    • 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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
    • F16H55/24—Special devices for taking up backlash

Definitions

  • the invention belongs to the category of mechanical transmission, in particular to a device for eliminating the meshing gap of the worm gear and increasing the output torque.
  • the worm gear is a mechanical component commonly used in mechanical transmission, which can realize a large speed ratio and has self-locking characteristics.
  • the backlash of the worm drive is a very serious problem, which causes the system to have a backlash. And even affect the stability of the control system.
  • Method 1 using two worm gears, one worm wheel against the left side of the worm tooth and the other against the right side of the worm tooth, as shown in Figure 1.
  • the force of the two worm wheels sandwiching the worm teeth is determined by a tension spring. Since the tension spring always pulls the two worm gears together, the backlash is always zero.
  • the disadvantage of this method is that when the torque transmitted by the worm wheel is greater than the tension of the spring, the spring needs to be extended to generate a larger pulling force, and at this time the backlash is generated.
  • Figure 2 Another method is shown in Figure 2, which uses a double-lead worm. Adjust the double-lead worm and worm gear meshing parts to eliminate the backlash. Fixing this position can keep the running without backlash for a period of time, but with the increase of mechanical wear, the axial direction of the worm should be re-adjusted after a period of time. position. The need to repeatedly adjust the worm position multiple times is a disadvantage.
  • the object of the present invention is to overcome the problem that the worm gear meshing gap in the mechanical transmission and the transmission torque in the method 1 are small, overcome the deficiencies of the above three technologies, and provide an elimination of the worm gear meshing gap and increase the output. Torque device.
  • the utility model relates to a device for eliminating the meshing gap of a worm gear and increasing the output torque, comprising a main worm wheel piece, a sub-worm wheel piece and a force arm structure, wherein the main worm wheel piece and the auxiliary worm wheel piece are concentrically arranged to make the main worm wheel piece and the auxiliary worm wheel
  • the piece can be relatively rotated;
  • the force arm structure comprises a point, a power arm and a resistance arm, the fulcrum is disposed on the main worm wheel piece, and the resistance arm is connected to the auxiliary worm wheel piece, the power arm length is greater than the length of the resistance arm,
  • the power arm exerts a small force, and a large force is generated at the end of the resistance arm, so that a large output torque can be generated around the fulcrum.
  • One end of the resistance arm includes a boss, and the auxiliary worm wheel piece is provided with a long key groove in a radial direction, the boss is inserted into the key groove, and a main worm wheel piece corresponding to the key groove is provided with a larger than a key groove.
  • the through hole is such that when the main worm wheel piece and the sub worm wheel piece are relatively rotated, the key groove is always exposed to the through hole.
  • the force end of the power arm is connected to a spring, and the other end of the spring is connected to the main worm wheel or the auxiliary worm wheel.
  • the force applying end of the power arm applies an external force by the elastic force of the spring, so that the boss on the resistance arm pushes the auxiliary worm wheel piece in the key groove, so that the main and auxiliary worm wheel pieces rotate relative to each other, thereby eliminating the gap.
  • the main worm wheel piece or the sub-worm wheel piece may further be provided with a bolt base or a nut, and the corresponding bolt bears against the urging end of the power arm. Adjust the position of the bolt on the base or the nut so that there is a certain pressure on the end of the power arm, and then tighten it to the base or the nut. The external force is applied to the power arm by the pressure of the bolt to promote the resistance arm. The boss pushes the auxiliary worm wheel in the key groove to make the main and auxiliary worm wheel pieces rotate relative to each other, thereby eliminating the gap.
  • the power arm material may be made of an elastic material such as a brass piece or a spring steel piece, and the force applying end of the power arm is fixed to the main worm wheel piece or the auxiliary worm wheel piece with a certain prestress.
  • the external force applied to the end of the power arm is provided by the elastic deformation force of the material of the power arm.
  • the end portion is fixed on the main worm wheel or the sub-worm wheel piece, and is provided by elastic pre-deformation of the material of the power arm.
  • the external force causes the boss on the resistance arm to push the auxiliary worm wheel in the keyway, so that the main and auxiliary worm wheel pieces rotate relative to each other, thereby eliminating the gap.
  • the primary and secondary worm wheel segments of the present invention may be interchangeably referred to without affecting implementation.
  • the invention adopts the force arm structure, applies an external force to the force application end of the power arm, and causes the boss on the resistance arm to push the auxiliary worm wheel piece in the key groove, so that the main and auxiliary worm wheel pieces rotate relative to each other, thereby eliminating the meshing clearance of the worm gear and the worm gear, and at the same time
  • the length is greater than the length of the resistance arm, which increases the output torque, thereby improving the transmission accuracy and the rigidity of the system transmission, and can be applied to the field of precision transmission and heavy-duty power transmission.
  • the structure is simple and the adjustment is convenient.
  • FIG. 1 is a schematic view of a prior art double worm wheel relief backlash device.
  • FIG. 2 is a schematic view of a prior art double lead worm eliminating backlash device.
  • Figure 3 is a schematic view of the structure of a preferred embodiment of the present invention.
  • Fig. 4 is a cross-sectional view taken along line A in Fig. 3;
  • Fig. 5 is a partial cross-sectional view taken along line B of Fig. 3;
  • Fig. 6 is a partially enlarged schematic view showing the first embodiment of the present invention.
  • Fig. 7 is a partially enlarged schematic view showing the second embodiment of the present invention.
  • Figure 8 is a partially enlarged schematic view showing a third embodiment of the present invention.
  • Figure 9 is a schematic illustration of another form of the force arm structure.
  • a device for eliminating the meshing clearance of the worm gear and increasing the output torque comprises a main worm wheel piece 1, a sub-worm wheel piece 2 and a force arm structure, a main worm wheel piece 1 and a sub worm wheel piece 2
  • the coaxial worm gear is mounted on the step circle of the main worm wheel with a retaining ring 3 for preventing axial swaying;
  • the arm structure includes a power arm 8, a resistance arm 9 and a fulcrum 4, and the fulcrum 4 is disposed on the main worm wheel.
  • the arm structure is rotatable about the fulcrum 4, the length of the power arm 8 is greater than the length of the resistance arm 9, the resistance arm 9 includes a boss 5 at one end, and a long keyway in the radial direction is provided on the worm wheel 2. 6.
  • the boss 5 is inserted into the keyway 6, and a through hole 7 larger than the key groove is provided on the main worm wheel piece 1 corresponding to the key groove 6, so that the main worm wheel piece 1 and the sub-worm wheel piece 2 can be relatively rotated.
  • the force applying arm 8 is also connected with a device 10 for applying an external force to apply an external force to the power arm 8.
  • a device for eliminating the meshing clearance of the worm gear and increasing the output torque includes a main worm wheel piece 1, a sub-worm wheel piece 2, and a force arm structure (including the power arm 8 and the resistance arm 9 and the fulcrum 4).
  • the device 10 for providing an external force to the power arm 8 is characterized in that the external force providing device 10 is a spring 11 .
  • One end of the spring 11 is fixed to the urging end of the power arm 8 , and the other end is fixed on the main worm wheel piece 1 or the sub worm wheel piece 2 .
  • the fulcrum 4 of the arm structure is on the main worm wheel piece 1 and is movable around the fulcrum 4, and the boss 5 at one end of the resistance arm 9 is inserted into the key groove 6 of the sub-worm wheel piece 2.
  • an external force is applied to the urging end of the power arm 8 by the elastic force of the spring 11, so that the boss 5 at the end of the resistance arm 9 pushes the worm wheel piece 2 in the key groove 6, so that the main worm wheel piece 1 and the sub worm wheel piece 2 are relatively opposed. Rotate to eliminate the meshing gap. Since the length of the power arm 8 is larger than the resistance arm 9, a small force is applied to the power arm 8 to generate a large force at the end of the resistance arm 9, so that a large torque can be output.
  • a device for eliminating the meshing clearance of the worm gear and increasing the output torque includes a main worm wheel piece 1, a sub-worm wheel piece 2, and a force arm structure (including the power arm 8 and the resistance arm 9 and the fulcrum 4).
  • the device 10 for providing an external force to the power arm 8 is characterized in that the external force providing device 10 can also be a bolt 12, and the base 14 or the nut of the bolt 12 is fixed on the main worm wheel piece 1 or the sub-worm wheel piece 2, and the adjusting bolt 12 is provided.
  • the bottom end of the force arm structure is placed on the main worm wheel piece 1 and is movable around the fulcrum 4, and the boss 5 at one end of the resistance arm 9 is inserted into the key groove 6 of the auxiliary worm wheel piece 2 .
  • an external force is applied to the urging end of the power arm 8 by the pressing force of the bolt 12, and the resistance arm 9 is rotated around the fulcrum 4, so that the main worm wheel piece 1 and the sub worm wheel piece 2 are relatively rotated to eliminate the meshing gap. Since the length of the power arm 8 is larger than the length of the resistance arm 9, a small force is applied to the power arm 8 to generate a large force at the end of the resistance arm 9, thereby outputting a large torque.
  • a device for eliminating the meshing clearance of the worm gear and increasing the output torque includes a main worm wheel piece 1, a sub-worm wheel piece 2, and a force arm structure (including the power arm 8 and the resistance arm 9 and the fulcrum 4).
  • the device 10 for providing an external force to the power arm is characterized in that the external force providing device 10 can also be the power arm 8 itself, and the force end of the power arm 8 is fixed to the main worm wheel piece 1 or the sub-worm wheel piece 2 by screws 13
  • the fulcrum 4 of the structure is on the main worm wheel piece 1 and is movable around the fulcrum 4, and one end of the resistance arm 9 includes a boss 5 which is inserted into the key groove 6 of the sub-worm wheel piece 2.
  • the urging end of the power arm 8 is fixed to the main worm wheel piece 1 or the sub worm wheel piece 2 by screws 13, and the elastic pre-deformation force of the material of the power arm 8 itself is relied upon.
  • An external force is applied to the urging end of the power arm 8, and the resistance arm 9 is rotated about the fulcrum 4, so that the main worm wheel piece 1 and the sub worm wheel piece 2 are relatively rotated to eliminate the meshing gap. Since the length of the power arm 8 is greater than the length of the resistance arm 9, a small force is applied to the power arm to generate a large force at the end of the resistance arm 9, thereby outputting a large torque.
  • the shape of the power arm is not limited to the above three structures, and may be other structures. As shown in FIG. 9, the shape of the power arm may also be curved, and finally the main worm wheel and the sub worm wheel may be opposite. Rotation, eliminating the meshing gap, can achieve the purpose of the invention.

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

Abstract

一种消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，包括一主蜗轮片（1）、一副蜗轮片（2）、一力臂结构，力臂结构包括一支点（4），一动力臂（8）和一阻力臂（9），支点（4）设于主蜗轮片（1）上，阻力臂（9）连接于副蜗轮片（2）上，阻力臂（9）端包含一凸台（5），将凸台（5）插入到副蜗轮片（2）的键槽（6）中。动力臂（8）长度大于所述阻力臂（9）长度，对动力臂（8）端施加一个很小的外力，在阻力臂（9）端就会产生很大的力，使得阻力臂（9）端的凸台（5）在键槽（6）中推动副蜗轮片（2），从而使主蜗轮片（1）和副蜗轮片（2）产生相对转动且增大了蜗轮输出的力矩，实现了在方便地消除蜗轮蜗杆啮合间隙的同时，增大输出力矩，提高了系统的刚性，并且结构简单，调整方便。

Description

一种消除蜗轮蜗杆啮合间隙且增大输出力矩的装置 技术领域
本发明属于机械传动类，具体是一种消除蜗轮蜗杆啮合间隙且增大输出力矩的装置。
背景技术
蜗轮蜗杆是机械传动中常用到的机械部件，可实现大的速比，且有自锁的特性，但在精密传动中，蜗杆传动的齿隙是个非常严重的问题，它造成了系统的回差，甚至影响控制系统的稳定性。
人们采用多种方法来减小齿隙，例如方法1，使用两个蜗轮并用，一个蜗轮靠住蜗杆齿的左侧，另一个则靠住蜗杆齿的右侧，如图1所示。两个蜗轮夹住蜗杆齿的力的大小由一个拉簧来确定，由于拉簧始终将两个蜗轮拉向在一起，所以齿隙就总是为零。但此法的缺点是：当蜗轮所传递的力矩大于弹簧的拉力时，弹簧需要更大的伸展来产生更大的拉力，而此时齿隙就产生。
另一种方法见图2，是采用了双导程的蜗杆。调整双导程的蜗杆和蜗轮啮合部位即可消除齿隙，固定住这个位置可以保持无齿隙运行一段时间，但随着机械磨损的增加，一段时间后又要重新再调整一次蜗杆的轴向位置。需要多次反复调整蜗杆位置又是一个缺点。
还有一个方法3，是采用双蜗轮片加上偏心销，见专利号ZL200820217119.4，其缺点也是隔一段时间需要调整一次。
 技术问题
有鉴于此，本发明的目的在于克服机械传动中蜗轮蜗杆啮合间隙和方法1中所述传动力矩小的问题，克服以上三种技术的不足，提供了一种消除蜗轮蜗杆啮合间隙且增大输出力矩的装置。
技术解决方案
一种消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，包括主蜗轮片、副蜗轮片、力臂结构，其特征在于：主蜗轮片和副蜗轮片同心设置，以使主蜗轮片、副蜗轮片可以相对转动；力臂结构包括一支点，一动力臂和一阻力臂，所述支点设于主蜗轮片上，阻力臂连接于副蜗轮片上，所述动力臂长度大于所述阻力臂长度，对动力臂施加很小的力，在阻力臂端就会产生很大的力，从而绕支点可产生很大的输出力矩。所述阻力臂的一端包含一凸台，所述副蜗轮片上设有一个半径方向上的长键槽，将所述凸台插入所述键槽中，在与键槽对应的主蜗轮片上设有一大于键槽的通孔，以使主蜗轮片和副蜗轮片发生相对转动时，键槽始终暴露于该通孔。
进一步，所述动力臂的施力端连接一弹簧，弹簧的另一端连接于主蜗轮片或副蜗轮片。对动力臂的施力端通过弹簧的弹力施加外力，促使阻力臂上的凸台在键槽内推动副蜗轮片，使主、副蜗轮片产生相对转动，进而消除间隙。
进一步，所述主蜗轮片或副蜗轮片上还可以设有螺栓基座或螺母，其对应螺栓顶住动力臂的施力端。调整螺栓在基座或螺母上的位置，以使得对动力臂施力端有一定顶压力，然后将其拧紧固定在基座或螺母上，通过螺栓的顶压为动力臂施加外力，促使阻力臂上的凸台在键槽内推动副蜗轮片，使主、副蜗轮片产生相对转动，进而消除间隙。
进一步，所述动力臂材料可以由黄铜片或弹簧钢片等弹性材料制成，动力臂的施力端以一定预应力固定于主蜗轮片或副蜗轮片上。对动力臂端施加的外力由动力臂材料的弹性变形力来提供，将动力臂左右调整好后，将其端部固定于主蜗轮片或副蜗轮片上，依靠动力臂材料的弹性预变形来提供外力，促使阻力臂上的凸台在键槽内推动副蜗轮，使主、副蜗轮片产生相对转动，进而消除间隙。
本发明中的主、副蜗轮片可以互换称谓而不影响实施。
 有益效果
本发明采用力臂结构，对动力臂的施力端施加外力，促使阻力臂上的凸台在键槽内推动副蜗轮片，使主、副蜗轮片相对转动，进而消除蜗轮蜗杆啮合间隙，同时由于动力臂长度大于阻力臂长度，增大了输出力矩，从而提高了传动精度和系统传动的刚度，能够适用精密传动和重载动力传动领域。结构简单，调整方便。
 附图说明
图1是现有技术的双蜗轮消除齿隙装置示意图。
图2是现有技术的双导程蜗杆消除齿隙装置示意图。
图3是本发明优选实施例的结构示意图。
图4是图3的A向剖视图。
图5是图3的B向局部剖视图。
图6是本发明实施例1的局部放大示意图。
图7是本发明实施例2的局部放大示意图。
图8是本发明实施例3的局部放大示意图。
图9是力臂结构的另一种形式示意图。
 本发明的实施方式
下面结合附图和实施例对本发明作进一步的说明。
如图3、4、5所示，一种消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，包括主蜗轮片1、副蜗轮片2和一力臂结构，主蜗轮片1和副蜗轮片2以同轴心配合安装在一起，在主蜗轮片的阶梯圆上安装有防止轴向窜动的挡圈3；力臂结构包含动力臂8，阻力臂9及支点4，支点4设于主蜗轮片1上，力臂结构可绕支点4转动，动力臂8的长度大于阻力臂9的长度，阻力臂9一端包含一凸台5，在副蜗轮片2上设有一个半径方向上的长键槽6，将凸台5插入键槽6中，在与键槽6对应的主蜗轮片1上设有一大于键槽的通孔7，以使主蜗轮片1和副蜗轮片2可以相对转动。动力臂8施力端还连接有施加外力的装置10，对动力臂8施加外力。
实施例1
如图3、6所示，一种消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，包括主蜗轮片1、副蜗轮片2、力臂结构（包含动力臂8和阻力臂9及支点4）、为动力臂8提供外力的装置10，其特征在于：外力提供装置10为一弹簧11，弹簧11一端固定在动力臂8的施力端，另一端固定在主蜗轮片1或副蜗轮片2上，力臂结构的支点4在主蜗轮片1上，并可绕支点4运动，阻力臂9一端的凸台5插入到副蜗轮片2的键槽6内。
本实施例通过弹簧11的弹力对动力臂8的施力端施加外力，使阻力臂9端部的凸台5在键槽6内推动副蜗轮片2，从而使主蜗轮片1和副蜗轮片2产生相对转动，消除啮合间隙。由于动力臂8长度大于阻力臂9，对动力臂8施加很小的力就可在阻力臂9端产生很大的力，从而可输出很大力矩。
实施例2
如图3、7所示，一种消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，包括主蜗轮片1、副蜗轮片2、力臂结构（包含动力臂8和阻力臂9及支点4）、为动力臂8提供外力的装置10，其特征在于：外力提供装置10也可以为螺栓12，将螺栓12的基座14或螺母固定在主蜗轮片1或副蜗轮片2上，调整螺栓12使其底端顶住动力臂8的施力端，力臂结构的支点4在主蜗轮片1上，并可绕支点4运动，阻力臂9一端的凸台5插入到副蜗轮片2的键槽6内。
本实施例通过螺栓12的顶压对动力臂8的施力端施加外力，使阻力臂9绕支点4转动，从而使主蜗轮片1和副蜗轮片2产生相对转动，消除啮合间隙。由于动力臂8的长度大于阻力臂9的长度，对动力臂8施加很小的力就可在阻力臂9端产生很大的力，从而输出很大的力矩。
实施例3
如图3、8所示，一种消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，包括主蜗轮片1、副蜗轮片2、力臂结构（包含动力臂8和阻力臂9及支点4）、为动力臂提供外力的装置10，其特征在于：外力提供装置10也可以为动力臂8自身，用螺钉13将动力臂8的施力端固定在主蜗轮片1或副蜗轮片2上，力臂结构的支点4在主蜗轮片1上，并可绕支点4运动，阻力臂9一端包含一凸台5，将其插入到副蜗轮片2的键槽6内。
本实施例通过对动力臂8的左右调整到适合位置后，用螺钉13将动力臂8的施力端固定在主蜗轮片1或副蜗轮片2上，依靠动力臂8自身材料的弹性预变形力对动力臂8的施力端施加外力，使阻力臂9绕支点4转动，从而使主蜗轮片1和副蜗轮片2产生相对转动，消除啮合间隙。由于动力臂8长度大于阻力臂9的长度，对动力臂施加很小的力就可在阻力臂9端产生很大的力，从而输出很大的力矩。
当然，动力臂的形状也并不局限于以上叙述的三种结构，也可以是其他结构，如图9所示，动力臂形状也可以是弧形，最终能使主蜗轮片和副蜗轮片相对转动，消除啮合间隙，均能达到发明目的。
最后说明的是，以上实施例仅用以说明本发明的技术方案而非限制，尽管参照较佳实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或者等同替换，而不脱离本发明技术方案的宗旨和范围，其均应涵盖在本发明的权利要求范围当中。

Claims (8)

  1. 一种消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，包括一主蜗轮片、一副蜗轮片和一力臂结构，其特征在于：所述主蜗轮片和所述副蜗轮片同心设置，以使主蜗轮片、副蜗轮片可以相对转动；所述力臂结构包括一支点，一动力臂和一阻力臂，所述支点设于所述主蜗轮片上，所述阻力臂连接于所述副蜗轮片上。
  2. 根据权利要求1所述的消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，其特征在于：所述动力臂长度大于所述阻力臂长度。
  3. 根据权利要求1所述的消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，其特征在于：所述动力臂的施力端连接一弹簧，弹簧的另一端连接于所述主蜗轮片或所述副蜗轮片。
  4. 根据权利要求1所述的消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，其特征在于：主蜗轮片或副蜗轮片上设有螺栓基座或螺母，其对应螺栓通过顶住动力臂的施力端来施力。
  5. 根据权利要求1所述的消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，其特征在于：所述动力臂材料由黄铜片或弹簧钢片等弹性材料制成，动力臂的施力端以一定预应力固定于主蜗轮片或副蜗轮片上。
  6. 根据权利要求1所述的消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，其特征在于：所述阻力臂的一端包含一凸台。
  7. 根据权利要求6所述的消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，其特征在于：所述副蜗轮片上设有一半径方向上的长键槽，将所述凸台插入所述键槽中。
  8. 根据权利要求7所述的消除蜗轮蜗杆啮合间隙且增大输出力矩的装置，其特征在于：在与所述键槽对应的主蜗轮片上设有一大于所述键槽的通孔，以使主蜗轮片和副蜗轮片相对转动时，所述键槽暴露于所述通孔。
PCT/CN2013/074422 2012-08-31 2013-04-19 一种消除蜗轮蜗杆啮合间隙且增大输出力矩的装置 WO2014032433A1 (zh)

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