WO2019041983A1 - 动力工具 - Google Patents

动力工具 Download PDF

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Publication number
WO2019041983A1
WO2019041983A1 PCT/CN2018/092260 CN2018092260W WO2019041983A1 WO 2019041983 A1 WO2019041983 A1 WO 2019041983A1 CN 2018092260 W CN2018092260 W CN 2018092260W WO 2019041983 A1 WO2019041983 A1 WO 2019041983A1
Authority
WO
WIPO (PCT)
Prior art keywords
power tool
output shaft
auxiliary handle
cavity
disposed
Prior art date
Application number
PCT/CN2018/092260
Other languages
English (en)
French (fr)
Inventor
张锐
Original Assignee
南京德朔实业有限公司
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 南京德朔实业有限公司 filed Critical 南京德朔实业有限公司
Priority to EP18852398.9A priority Critical patent/EP3628447B1/en
Publication of WO2019041983A1 publication Critical patent/WO2019041983A1/zh
Priority to US16/744,512 priority patent/US10890229B2/en

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Classifications

    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
    • F16F15/1213—Spiral springs, e.g. lying in one plane, around axis of rotation
    • 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
    • B25F5/006—Vibration damping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/005—Auxiliary devices used in connection with portable grinding machines, e.g. holders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/007—Weight compensation; Temperature compensation; Vibration damping
    • 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
    • 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
    • B25F5/025—Construction of casings, bodies or handles with torque reaction bars for rotary tools
    • 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
    • B25F5/025—Construction of casings, bodies or handles with torque reaction bars for rotary tools
    • B25F5/026—Construction of casings, bodies or handles with torque reaction bars for rotary tools in the form of an auxiliary handle

Definitions

  • the present disclosure relates to a power tool, and in particular to an angle grinder.
  • Power tools usually generate large vibrations during work.
  • the grinding plate will cause vibration of the whole machine when it comes into contact with the workpiece, and the motor and the transmission component will also vibrate during the transmission process.
  • the specific structure of the grinding plate and the installation error may cause
  • the grinding disc has a certain amount of unbalance when rotating, and the unbalanced amount causes the angular grinding to further generate a large vibration during the operation, which makes the user unable to operate the power tool stably.
  • the angular grinding is usually in the shell during design.
  • the auxiliary handle is installed on the body, so that the user can hold the power tool with both hands to achieve relatively stable operation, but because the vibration of the power tool is too large, the user can not ensure stable operation, and the vibration is transmitted through the auxiliary handle. To the user, it is easy to cause discomfort to the user.
  • an object of the present disclosure is to provide a power tool with good vibration damping effect.
  • a power tool includes: a housing, a motor, a working head, a transmission assembly and an auxiliary handle, the housing is formed with a main handle for the user to hold, the motor is disposed in the housing, the motor further has a drive shaft, the working head An output shaft and a grinding plate connected to the output shaft, the output shaft is driven by a motor, the transmission assembly is used for transmitting power between the drive shaft and the output shaft; the front end of the auxiliary handle is mounted to the housing near the working head,
  • the auxiliary handle includes a grip extending along a center line; the auxiliary handle further includes: a vibration damping assembly including at least one mass member and a plurality of elastic members; wherein the auxiliary handle further includes an end cover disposed at a rear end of the grip portion The rear end is further away from the housing than the front end, and a receiving cavity for accommodating at least a part of the damper assembly is formed in the end cover; the elastic element is disposed between the mass member and the cavity wall of the accommodating cavity; the natural frequency W1
  • the at least one mass member is disposed in a longitudinal plane perpendicular to the center line, and the plurality of elastic members include a first elastic element group that connects the mass member in the receiving cavity of the end cap in the first direction in the longitudinal plane and The mass member is coupled to the second set of resilient members within the receiving cavity of the end cap in a second direction that is perpendicular to the first direction.
  • the elastic members are springs that respectively connect the mass member and the auxiliary handle; the number of springs is an even number.
  • an even number of springs are symmetrically arranged about a plane of symmetry.
  • end cap and the rear end of the grip form a detachable connection.
  • the cavity wall of the accommodating cavity is formed with a groove
  • the elastic member is a spring which is disposed at both ends between the mass member and the cavity wall of the accommodating cavity, and the end of the spring near the cavity wall of the accommodating cavity is at least partially accommodated in the groove.
  • the elastic member is a spring disposed at both ends between the mass member and the cavity wall of the accommodating cavity; the cavity of the accommodating cavity is provided with a mounting member for mounting the spring, the mounting member is formed with a mounting post, and the spring is adjacent to the accommodating cavity One end of the cavity wall is fitted to the mounting post.
  • the mass member includes a main body portion and an additional portion, the main body portion is coupled to the elastic member, and the additional portion is detachably coupled to the main body portion.
  • the center line of the grip portion passes through the mass member;
  • the elastic member is a spring disposed at both ends between the mass member and the chamber wall of the accommodating chamber; and the spring is at a center line perpendicular to the center line when the damper assembly is in equilibrium The longitudinal extension of the plane.
  • the center line of the grip portion passes through the mass member;
  • the elastic member is a spring disposed between the mass member and the cavity wall of the receiving chamber, the extending direction of the spring is perpendicular to the center line; the number of springs is 4, 4 springs are It is evenly arranged around the center line in the circumferential direction.
  • the axis of rotation of the drive shaft of the motor is perpendicular to the axis of rotation of the output shaft.
  • Another power tool includes: a housing, a motor, a working head, a transmission assembly and an auxiliary handle, the housing is formed with a main handle for the user to hold, the motor is disposed in the housing, the motor further has a drive shaft, the working head The part has an output shaft and a grinding plate connected to the output shaft, the output shaft is driven by a motor, the transmission assembly is used for transmitting power between the drive shaft and the output shaft; the auxiliary handle is detachably mounted to the housing near the working head
  • the auxiliary handle includes a grip extending along a center line; the auxiliary handle further includes: a vibration damping assembly including at least one mass member and a plurality of elastic members; wherein the auxiliary handle is formed with a damping member for receiving the vibration damping assembly a accommodating cavity; a plurality of elastic members are disposed between the mass member and the cavity wall of the accommodating cavity; a ratio of a natural frequency W1 of the damper assembly to a rotational frequency W2 when the output shaft rotates is greater than or
  • the accommodating chamber has a cavity wall, and the cavity wall is respectively provided with a mounting member for mounting the first elastic element group and the second elastic element group.
  • Yet another power tool includes: a housing, a motor, a working head and an auxiliary handle, the housing is formed with a main handle for the user to hold, the motor is disposed in the housing, the working head has an output shaft, and the output shaft is driven by the motor
  • the auxiliary handle is detachably mounted to the housing near the working head; the auxiliary handle further includes: a vibration damping assembly including at least one mass member and a plurality of elastic members; wherein the auxiliary handle is formed to accommodate the vibration damping a accommodating cavity of the assembly; a plurality of elastic members are disposed between the mass member and the cavity wall of the accommodating cavity; a ratio of a natural frequency W1 of the damper assembly to a rotational frequency W2 when the output shaft rotates is greater than or equal to 0.7 and less than or equal to 1.3; the auxiliary handle includes a grip extending along a centerline; at least one mass member disposed in a longitudinal plane perpendicular to the centerline, the plurality of resilient members including a first one of the
  • the accommodating chamber has a cavity wall, and the cavity wall is respectively provided with a mounting member for mounting the first elastic element group and the second elastic element group.
  • the present disclosure is advantageous in that the vibration damping assembly is disposed in the auxiliary handle, so that the vibration of the power tool can be reduced, and the problem of discomfort of the user's body due to the vibration transmitted to the user through the auxiliary handle can be avoided.
  • Figure 1 is a plan view of the power tool of the first embodiment
  • FIG. 2 is a perspective view of the power tool of Figure 1 with the wear plate removed;
  • Figure 3 is a structural view of the power tool of Figure 2 when the auxiliary handle is separated from the housing;
  • Figure 4 is a perspective view showing a partial structure of the auxiliary handle of Figure 3;
  • Figure 5 is an exploded view of the auxiliary handle of Figure 3 at an angle
  • Figure 6 is an exploded view of the auxiliary handle of Figure 3 at another angle;
  • Figure 7 is a structural view of the auxiliary handle of Figure 3 when the spring directly abuts the groove;
  • Figure 8 is a plan simplified schematic view of the spring and mass member of Figure 5;
  • Figure 9 is a plan view of the power tool of the second embodiment.
  • the power tool 100 of the first embodiment shown in FIG. 1 may specifically be an angle grinder.
  • the grinding piece When the angle grind is used for the grinding work, the grinding piece may have a certain rotation when the grinding piece is rotated due to the specific structure of the grinding plate and the installation error. The unbalanced amount causes the angular grind to generate a large vibration during the work.
  • the novel power tool 100 proposed by the present disclosure can reduce the vibration and avoid the discomfort of the user body caused by the vibration transmitted to the user. Interfering with the user's operation.
  • the power tool can also be other tools suitable for use in the substance of the present disclosure.
  • the power tool 100 includes a housing 11, a motor 12, a working head 13, a transmission assembly, and an auxiliary handle 20.
  • the housing 11 forms a main handle 111 for the user to hold, and for the angular grinding, the portion of the housing 11 forming the main handle 111 is also formed around an accommodation space for accommodating the motor 12, that is, the motor 12 is disposed within the main handle 111, and the motor 12 includes a drive shaft 121 for outputting power.
  • the working head 13 is disposed at an end of the housing 11, and the working head 13 includes an output shaft 131 and a grinding blade 132 coupled to the output shaft 131.
  • the motor 12 is used to drive the output shaft 13 to rotate about the first axis 101, and the drive shaft 121 of the motor 12 is rotatable about the second axis 102.
  • the output shaft 13 outputs power when the first shaft 101 rotates under the driving of the motor 12.
  • the working attachment mounted thereon can be rotated, for example, the output shaft 13 drives the grinding blade 132 to rotate.
  • the transmission assembly is used to effect transmission of power between the motor 12 and the output shaft 13.
  • the first axis 101 of the rotation of the output shaft 13 and the second axis 102 of the rotation of the drive shaft 121 are perpendicular to each other.
  • the transmission assembly can realize the commutation of the power while realizing the transmission of the power.
  • the auxiliary handle 20 is detachably mounted on the housing 11. When the user holds the main handle 111 in one hand, the other hand can hold the auxiliary handle 20, thereby implementing the power tool 100 in both hands, thereby ensuring the stability of the user operation. .
  • the auxiliary handle 20 includes a grip portion 21, a connecting portion 22, and an end cap 23, wherein the grip portion 21 extends along a center line 103, and the grip portion 21 is centered on the center line 103.
  • the two ends of the grip portion 21 along the center line 103 are a front end 211 and a rear end 212, respectively, and the rear end 212 is farther from the housing 11 than the front end 211.
  • the connecting portion 22 is provided at the front end 211 of the grip portion 21 for causing the grip portion 21 to be indirectly attached to the housing 11 near the front end 211 of the housing 11.
  • the connecting portion 22 is a threaded post
  • the housing 11 is formed with a threaded hole 112
  • the auxiliary handle 20 is detachably mounted to the housing 11 by the cooperation of the threaded post and the threaded hole 112.
  • the end cover 23 is disposed at a rear end 212 of the grip portion 21 away from the housing 11 .
  • a rear end 212 at least partially located at the grip portion 21 is formed.
  • the receiving chamber 24 is provided.
  • the auxiliary handle 20 further includes a vibration damping assembly 25 for reducing vibration transmitted to the user by the power tool 100 during operation.
  • the ratio of the natural frequency W1 of the vibration damping assembly 25 to the rotational frequency W2 when the output shaft 13 rotates is greater than or equal to 0.7 and less than or equal to 1.3, so that when the working head 13 of the power tool 100 is operated, vibration damping is performed.
  • the assembly 25 is capable of achieving a better damping effect, as will be described in more detail below.
  • the end cap 23 and the grip portion 21 constitute a detachable connection, such as a screw connection, a snap connection, or the end cover 23 and the grip portion 21 are detachably connected by screws.
  • a portion 24a of the accommodating chamber 24 formed when the end cap 23 is combined with the grip portion 21 is formed by the grip portion 21, and the other portion 24b is formed by the end cap 23.
  • the receiving chamber 24 for accommodating the damper assembly 25 is formed in the end cover 23 of the auxiliary handle 20; in other embodiments of the present disclosure, it may be formed in the auxiliary handle 20 for accommodating the reduction
  • the accommodating chamber 24 of the vibrating assembly 25 is not limited herein.
  • the vibration damping assembly 25 includes a mass member 251 and an elastic member 252 disposed between the mass member 251 and the auxiliary handle 20.
  • the elastic member 252 is a spring, and the number of springs is an even number.
  • the vibration damping assembly 25 includes four springs.
  • the accommodating chamber 24 is centered on the center line 103, and a plurality of springs are symmetrically disposed about a plane passing through the center line 103. In this way, the plurality of springs enable the damping assembly 25 to achieve damping in multiple directions.
  • the center line 103 passes through the mass member 251, that is, the mass member 251 is disposed in the direction in which the center line 103 extends.
  • the spring extends substantially in a plane that is perpendicular to the centerline 103.
  • the plurality of springs are evenly distributed around the mass member 251, and the extending direction of the spring is perpendicular to the center line 103, that is, the plurality of springs are also uniformly disposed in the circumferential direction around the center line 103.
  • the extending directions of the adjacent two springs are formed at an angle of 90 degrees, and the opposite two springs extend in a straight line, for example, as shown in FIG.
  • the spring 252a and the spring 252c is disposed in the first direction, that is, the X direction
  • the spring 252b and the spring 252d are disposed in the second direction, that is, the Y direction
  • the spring 252a and the spring 252c are symmetrically disposed on both sides of the mass member 251 in the X direction
  • the spring 252b and the spring 252d is disposed on both sides of the mass member 251 in the Y direction.
  • the plurality of resilient members 252 include a first set of resilient members that connect the mass member 251 into the receiving cavity 24 of the end cap 23 in a first direction in a longitudinal plane.
  • the mass members 251 are coupled to the second elastic element groups 252b, 252d within the receiving cavity 24 of the end cap 23 in 252a, 252c and in a second direction that is perpendicular to the first direction.
  • the cavity wall of the accommodating chamber 24 is formed with a groove 241, a portion 241a of the groove 241 is formed by the inner wall of the grip portion 21, and the other portion 241b of the groove 241 is formed by the inner wall of the end cap 23, when the end cap When the grip portion 21 is combined with the grip portion 21, a complete groove 241 is formed at the wall of the chamber of the accommodating chamber 24.
  • the damper assembly 25 further includes a mounting member 253 for mounting a spring.
  • the mounting member 253 is partially received in the slot 241, and the mounting member 253 is further formed with a mounting post 253a at least partially located outside the slot 241, the spring One end of the chamber wall adjacent to the accommodating chamber 24 is fitted on the mounting post 253a and the other end is connected to the mass member 251.
  • the spring near the cavity wall of the accommodating cavity 24 can also directly abut against the groove bottom of the groove 241, at which time the spring portion is accommodated in the groove 241.
  • the mass of the mass member 251 is fixed.
  • the mass member 251 can also be composed of two parts.
  • the mass member 251 can include a main body portion with a fixed mass and an additional portion with a variable mass. The additional portion and the main body portion are detachably connected, and the user can replace the same as needed. Additional parts with different qualities.
  • the natural frequency refers to the natural angular frequency.
  • the natural frequency W1 of the vibration damping assembly 25 refers to the first-order frequency in a certain direction when the mass member 251 vibrates.
  • the natural frequency W1 of the damper assembly 25 is a first-order frequency in the direction in which the mass member 251 vibrates in the extending direction of the spring.
  • the first-order frequency of the mass member 251 in the X direction is the natural frequency W1 of the vibration damping assembly 25 of the present disclosure.
  • the relationship between the natural frequency W1 of the vibration damping assembly 25 and the spring and the mass member 251 is:
  • K is the stiffness coefficient of the spring and M is the mass of the mass member 251.
  • the present invention has a ratio between a natural frequency W1 of the vibration damping assembly 25 of the power tool 100 of the working head 13 and a rotational frequency W2 of the output shaft 13 in a range of 0.7 or more and 1.3 or less, and the power of the hand-held type
  • the evaluation of the damping effect of the tool 100 is preferred, that is:
  • the frequency f of the rotation of the output shaft 13 is usually varied within a range or preset to a fixed value, so that the vibration can be set according to the frequency of the output shaft 13
  • the natural frequency W1 of the assembly 25, further, the stiffness coefficient K of the spring and the mass M of the mass member 251 can be set according to the natural frequency W1 of the vibration damping assembly 25, thereby achieving a better vibration damping effect.
  • the power tool 200 of the second embodiment shown in FIG. 9 may specifically be a hammer drill.
  • the auxiliary drill 202 is mounted on the casing 201 of the hammer drill.
  • the specific structure of the auxiliary handle 202 may be the same as the first implementation.
  • the specific structure of the auxiliary handle 20 is the same, and details are not described herein.
  • the power tool of the present disclosure may also be other tools with relatively large vibrations, such as a sander, an electric hammer, an impact wrench, etc., and details are not described herein.
  • the present disclosure provides a power tool that can make the power tool have a good vibration damping effect.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

一种动力工具(100)，包括：壳体(11)、马达(12)、输出轴(131)、工作头部(13)、传动组件、辅助把手(20)和减振组件(25)，壳体形成有用于供用户握持的主把手(111)，马达设置在壳体内，马达还具有驱动轴(121)，工作头部具有输出轴(131)和连接在输出轴上的磨片(132)，输出轴由马达驱动，辅助把手前端安装至壳体靠近工作头部处，辅助把手包括沿一中心线(103)延伸的握持部(21)，减振组件包括质量件(251)和弹性元件(252)；其中，辅助把手还包括设置在握持部的后端(212)的端盖(23)，后端相对前端远离壳体，端盖与握持部结合时围绕形成有用于容纳减振组件的容纳腔(24)；弹性元件(252)设置在质量件(251)和容纳腔的腔壁之间；减振组件的固有频率W1与输出轴转动时的转动频率W2的比值大于等于0.7且小于等于1.3。该动力工具的减振效果好。

Description

动力工具 技术领域
本公开涉及一种动力工具，具体涉及一种角磨。
背景技术
动力工具在工作过程中，通常会产生较大的振动。例如对于角磨而言，磨片在与工件接触时会使得整机产生振动，电机以及传动组件在传动过程中也会产生振动，再者，可能会因为磨片的具体结构以及安装误差等使得磨片在转动时具有一定的不平衡量，该不平衡量使得角磨在作业时进一步产生较大的振动，这些振动使得用户不能稳定的操作动力工具，为此，角磨在设计时通常会在壳体上安装有辅助把手，这样，用户能双手握持动力工具以实现相对比较稳定的操作，但是因为动力工具的振动太大，依然不能保证用户能够很稳定的操作，而且振动会通过辅助把手传递至用户，很容易引起用户身体的不适。
发明内容
为解决现有技术的不足，本公开的目的在于提供一种减振效果好的动力工具。
为了实现上述目标，本公开采用如下的技术方案：
一种动力工具，包括：壳体、马达、工作头部、传动组件和辅助把手，壳体形成有用于供用户握持的主把手，马达设置在壳体内，马达还具有驱动轴，工作头部具有输出轴和连接在输出轴上的磨片，输出轴由马达驱动，传动组件用于在驱动轴和输出轴之间实现动力的传递；辅助把手其前端安装至壳体靠近工作头部处，辅助把手包括沿一中心线延伸的握持部；辅助把手还包括：减振组件，减振组件包括至少一个质量件和若干弹性元件；其中，辅助把手还包括设置在握持部的后端的端盖，后端相对前端更远离壳体，端盖内形成有用于容纳至少部分减振组件的容纳腔；弹性元件设置在质量件和容纳腔的腔壁之间；减振组件的固有频率W1与输出轴转动时的转动频率W2的比值大于等于0.7且小于等于1.3。
进一步地，至少一个质量件设置在一个垂直于中心线的纵向平面内，若干弹性元件中包括在纵向平面内沿第一方向将质量件连接到端盖的容纳腔内的第一弹性元件组和沿相对第一方向垂直的第二方向将质量件连接到端盖的容纳腔内的第二弹性元件组。
进一步地，弹性元件为分别连接质量件和辅助把手的弹簧；弹簧的数目为偶数。
进一步地，偶数个弹簧关于一个对称平面对称设置。
进一步地，端盖与握持部的后端构成可拆卸连接。
进一步地，容纳腔的腔壁形成有槽，弹性元件为两端分别设置在质量件和容纳腔的腔壁之间的弹簧，弹簧靠近容纳腔的腔壁的一端至少部分容纳在槽内。
进一步地，弹性元件为两端分别设置在质量件和容纳腔的腔壁之间的弹簧；容纳腔的腔壁处设置有用于安装弹簧的安装件，安装件形成有安装柱，弹簧靠近容纳腔的腔壁的一端套装在安装柱。
进一步地，质量件包括：主体部和附加部，主体部与弹性元件连接，附加部与主体部构成可拆卸连接。
进一步地，握持部的中心线经过质量件；弹性元件为两端分别设置在质量件和容纳腔的腔壁之间的弹簧；在减振组件处于平衡状态下，弹簧在一个垂直于中心线的纵向平面内延伸。
进一步地，握持部的中心线经过质量件；弹性元件为设置在质量件和容纳腔的腔壁之间的弹簧，弹簧的延伸方向垂直于中心线；弹簧的数目为4，4个弹簧在围绕中心线的圆周方向上均匀设置。
进一步地，马达的驱动轴转动的轴线垂直于输出轴转动的轴线。
另一种动力工具，包括：壳体、马达、工作头部、传动组件和辅助把手，壳体形成有用于供用户握持的主把手，马达设置在壳体内，马达还具有驱动轴，工作头部具有输出轴和连接在输出轴上的磨片，输出轴由马达驱动，传动组件用于在驱动轴和输出轴之间实现动力的传递；辅助把手可拆卸式安装至壳体靠近工作头部处，辅助把手包括沿一中心线延伸的握持部；辅助把手还包括：减振组件，减振组件包括至少一个质量件和若干弹性元件；其中，辅助把手内形 成有用于容纳减振组件的容纳腔；若干弹性元件设置在质量件和容纳腔的腔壁之间；减振组件的固有频率W1与输出轴转动时的转动频率W2的比值大于等于0.7且小于等于1.3；至少一个质量件设置在一个垂直于中心线的纵向平面内，若干弹性元件中包括在纵向平面内沿第一方向将质量件连接到容纳腔内的第一弹性元件组和沿相对第一方向垂直的第二方向将质量件连接到容纳腔内的第二弹性元件组。
进一步地，容纳腔具有腔壁，腔壁处分别设置有用于安装第一弹性元件组和第二弹性元件组的安装件。
又一种动力工具，包括：壳体、马达、工作头部和辅助把手，壳体形成有用于供用户握持的主把手，马达设置在壳体内，工作头部具有输出轴，输出轴由马达驱动；辅助把手可拆卸式安装至壳体靠近工作头部处；辅助把手还包括：减振组件，减振组件包括至少一个质量件和若干弹性元件；其中，辅助把手内形成有用于容纳减振组件的容纳腔；若干弹性元件设置在质量件和容纳腔的腔壁之间；减振组件的固有频率W1与输出轴转动时的转动频率W2的比值大于等于0.7且小于等于1.3；辅助把手包括沿一中心线延伸的握持部；至少一个质量件设置在一个垂直于中心线的纵向平面内，若干弹性元件中包括在纵向平面内沿第一方向将质量件连接到容纳腔内的第一弹性元件组和沿相对第一方向垂直的第二方向将质量件连接到容纳腔内的第二弹性元件组。
进一步地，容纳腔具有腔壁，腔壁处分别设置有用于安装第一弹性元件组和第二弹性元件组的安装件。
本公开的有益之处在于：减振组件设置在辅助把手内，从而能够降低动力工具的振动，且能避免因为通过辅助把手传递至用户的振动而引起用户身体的不适的问题。
附图说明
图1是第一实施例的动力工具的平面图；
图2是图1中的动力工具在去除磨片时的立体图；
图3是图2中的动力工具在辅助把手与壳体分离时的结构图；
图4是图3中的辅助把手的部分结构的立体图；
图5是图3中的辅助把手在一个角度下的爆炸图；
图6是图3中的辅助把手在另一个角度下的爆炸图；
图7是图3中的辅助把手在弹簧直接抵持槽时的结构图；
图8是图5中的弹簧和质量件的平面简化示意图；
图9是第二实施例的动力工具的平面图。
具体实施方式
图1所示的第一实施例的动力工具100具体可以为角磨，角磨在安装磨片进行打磨作业时，可能会因为磨片的具体结构以及安装误差等使得磨片在转动时具有一定的不平衡量，该不平衡量使得角磨在作业时产生较大的振动，为此，本公开提出的一种新型的动力工具100能够降低振动，避免振动传递到用户而引起的用户身体的不适以及对用户的操作产生干扰。当然可以理解的，该动力工具也可以为其它适用于本公开实质的工具。
如图1和图2所示，动力工具100包括：壳体11、马达12、工作头部13、传动组件以及辅助把手20。其中，壳体11形成用于供用户握持的主把手111，对于角磨而言，壳体11形成主把手111的部分还围绕形成有用于容纳马达12的容纳空间，也即是说，马达12设置在主把手111内，马达12包括用于输出动力的驱动轴121。工作头部13设置在壳体11的端部，工作头部13包括输出轴131和连接在输出轴131上的磨片132。马达12用于驱动输出轴13以第一轴线101为轴转动，马达12的驱动轴121能以第二轴线102为轴转动。输出轴13在马达12的驱动下以第一轴线101为轴转动时输出动力，输出轴13转动时能带动安装在其上的工作附件转动，例如输出轴13带动磨片132转动。传动组件用于在马达12和输出轴13之间实现动力的传递。对于角磨而言，输出轴13转动的第一轴线101与驱动轴121转动的第二轴线102相互垂直，为此，传动组件在实现动力的传递的同时还能够实现动力的换向。辅助把手20可拆卸的安装在壳体11上，当用户一手握持主把手111时，另一只手能握持辅助把手20，从而实现双手握持动力工具100，进而能够保证用户操作的稳定性。
如图1至图3所示，辅助把手20包括：握持部21、连接部22以及端盖23，其中，握持部21沿一个中心线103延伸，握持部21以中心线103为中心，握 持部21沿中心线103的两端分别为前端211和后端212，后端212相对前端211更远离壳体11。连接部22设置在握持部21的前端211，连接部22用于使得握持部21靠近壳体11的前端211间接安装至壳体11。具体而言，连接部22为螺纹柱，壳体11上形成有螺纹孔112，通过螺纹柱与螺纹孔112的配合使得辅助把手20可拆卸的安装至壳体11上。
如图3至图6所示，端盖23设置在握持部21的远离壳体11的后端212，端盖23与握持部21结合时形成有至少部分位于握持部21的后端212的容纳腔24。在本公开中，辅助把手20还包括减振组件25，减振组件25用于降低动力工具100在工作时传递至用户的振动。本公开的动力工具，其减振组件25的固有频率W1与输出轴13转动时的转动频率W2的比值大于等于0.7且小于等于1.3，这样当动力工具100的工作头部13工作时，减振组件25能够达到较好的减振效果，以下会具体述及。
具体而言，端盖23与握持部21构成可拆卸连接，例如螺纹连接、卡扣连接，或者通过螺钉使得端盖23与握持部21构成可拆卸连接。端盖23与握持部21结合时形成的容纳腔24的一部分24a由握持部21形成、另一部分24b由端盖23形成。
在本公开的实施例中，辅助把手20的端盖23内形成有用于容纳减振组件25的容纳腔24；在本公开的其它实施例中，可以是在辅助把手20内形成有用于容纳减振组件25的容纳腔24，在此并非有所限制。
在本实施例中，减振组件25包括质量件251和弹性元件252，弹性元件252设置在质量件251和辅助把手20之间。进一步而言，弹性元件252为弹簧，弹簧的数目为偶数，例如在本实施例中，减振组件25包括4个弹簧。容纳腔24以中心线103为中心，多个弹簧关于一个经过中心线103的平面对称设置。这样，多个弹簧能够使得减振组件25在多个方向上实现减振。
中心线103经过质量件251，也即是说，质量件251设置在中心线103延伸方向上。当减振组件25处于平衡状态时，弹簧基本在一个垂直于中心线103的平面内延伸。多个弹簧还在质量件251的周围均匀分布，弹簧的延伸方向垂直于中心线103，也即是说，多个弹簧还在围绕中心线103的圆周方向均匀设置。对于本实施例中的4个弹簧而言，相邻的两个弹簧的延伸方向形成有90度的夹 角，相对的两个弹簧在一条直线上延伸，例如图8所示，弹簧252a和弹簧252c设置在第一方向即X方向上，弹簧252b和弹簧252d设置在第二方向即Y方向上，弹簧252a和弹簧252c对称的设置在质量件251在X方向上的两侧，弹簧252b和弹簧252d设置在质量件251在Y方向上的两侧。具体而言，在一个垂直于中心线103的纵向平面内，若干弹性元件252中包括在纵向平面内沿第一方向将质量件251连接到端盖23的容纳腔24内的第一弹性元件组252a、252c和沿相对第一方向垂直的第二方向将质量件251连接到端盖23的容纳腔24内的第二弹性元件组252b、252d。
为了稳定的安装弹簧，容纳腔24的腔壁形成有槽241，槽241的一部分241a由握持部21的内壁所形成，槽241的另一部分241b由端盖23的内壁所形成，当端盖23和握持部21结合时，容纳腔24的腔壁处形成一个完整的槽241。当然，本领域技术人员可以理解的，槽241的结构并不以此为限。在本实施例中，减振组件25还包括用于安装弹簧的安装件253，安装件253一部分容纳在槽241内，安装件253还形成有至少部分位于槽241的外侧的安装柱253a，弹簧的靠近容纳腔24的腔壁的一端套装在安装柱253a上、另一端连接至质量件251。当然，可以理解的，如图7所示，弹簧靠近容纳腔24的腔壁的一端也可以直接抵持在槽241的槽底，此时，弹簧部分容纳在槽241内。
在本实施例中，质量件251的质量固定。在其它实施例中，质量件251也可以由两部分构成，质量件251可以包括质量固定的主体部和质量可变的附加部，附加部与主体部构成可拆卸连接，用户可以根据需要，更换具有不同质量的附加部。
固有频率指的是固有角频率。减振组件25的固有频率W1指的是质量件251振动时的某一个方向上的一阶频率。
在本实施例中，当弹性元件252为弹簧时，减振组件25的固有频率W1为质量件251在弹簧的延伸方向上发生振动时在该方向上的一阶频率。如图8所示，当质量件251在X方向上发生振动时，质量件251在X方向上的一阶频率即为本公开的减振组件25的固有频率W1。
具体而言，在本实施例中，减振组件25的固有频率W1与弹簧和质量件251之间的关系为：
Figure PCTCN2018092260-appb-000001
其中，K为弹簧的刚度系数，M为质量件251的质量。
而输出轴13的转动频率W2与输出轴13转动的频率f之间的关系为：
W2＝2π*f
本公开具有工作头部13的动力工具100的减振组件25的固有频率W1与输出轴13的转动频率W2之间的比值在大于等于0.7且小于等于1.3的区间内，其对手持式的动力工具100的减震效果评估是较佳的，也即是：
Figure PCTCN2018092260-appb-000002
也即是：
Figure PCTCN2018092260-appb-000003
而我们知道，对于特定的动力工具100而言，输出轴13转动的频率f通常是在一个范围内变动的或者预设为一个固定值，这样，可以根据输出轴13的频率来f设置减振组件25的固有频率W1，进一步而言，可以根据减振组件25的固有频率W1设置弹簧的刚度系数K和质量件251的质量M，从而达到更好的减振效果。
如图9所示的第二实施例的动力工具200，该动力工具200具体可以为冲击钻，冲击钻的壳体201上安装有辅助把手202，该辅助把手202的具体结构可以与第一实施例的辅助把手20的具体结构相同，具体不再赘述。
当然，可以理解的，本公开的动力工具还可以为其它振动比较大的工具，例如砂光机、电锤、冲击扳手等，具体不再赘述。
以上显示和描述了本公开的基本原理、主要特征和优点。本行业的技术人员应该了解，上述实施例不以任何形式限制本公开，凡采用等同替换或等效变换的方式所获得的技术方案，均落在本公开的保护范围内。
工业实用性
本公开提供了一种动力工具，可以使得动力工具的减振效果好。

Claims (15)

  1. 一种动力工具，包括：
    壳体，形成有用于供用户握持的主把手；
    马达，设置在所述壳体内，所述马达还具有驱动轴；
    工作头部，具有输出轴和连接在所述输出轴上的磨片，所述输出轴由所述马达驱动；
    传动组件，用于在所述驱动轴和所述输出轴之间实现动力的传递；
    其特征在于：
    所述动力工具还包括：
    辅助把手，其前端安装至所述壳体靠近所述工作头部处，所述辅助把手包括沿一中心线延伸的握持部；
    所述辅助把手还包括：
    减振组件，包括至少一个质量件和若干弹性元件；
    其中，所述辅助把手还包括设置在所述握持部的后端的端盖，所述后端相对所述前端更远离所述壳体，所述端盖内形成有用于容纳至少部分所述减振组件的容纳腔；所述弹性元件设置在所述质量件和所述容纳腔的腔壁之间；所述减振组件的固有频率W1与所述输出轴转动时的转动频率W2的比值大于等于0.7且小于等于1.3。
  2. 根据权利要求1所述的动力工具，其特征在于：
    至少一个所述质量件设置在一个垂直于所述中心线的纵向平面内，若干所述弹性元件中包括在所述纵向平面内沿第一方向将所述质量件连接到所述端盖的容纳腔内的第一弹性元件组和沿相对所述第一方向垂直的第二方向将所述质量件连接到所述端盖的容纳腔内的第二弹性元件组。
  3. 根据权利要求1所述的动力工具，其特征在于：
    所述弹性元件为分别连接所述质量件和所述辅助把手的弹簧；
    所述弹簧的数目为偶数。
  4. 根据权利要求3所述的动力工具，其特征在于：
    偶数个所述弹簧关于一个对称平面对称设置。
  5. 根据权利要求1所述的动力工具，其特征在于：
    所述端盖与所述握持部的后端构成可拆卸连接。
  6. 根据权利要求1所述的动力工具，其特征在于：
    所述容纳腔的腔壁形成有槽，所述弹性元件为两端分别设置在所述质量件和所述容纳腔的腔壁之间的弹簧，所述弹簧靠近所述容纳腔的腔壁的一端至少部分容纳在所述槽内。
  7. 根据权利要求1所述的动力工具，其特征在于：
    所述弹性元件为两端分别设置在所述质量件和所述容纳腔的腔壁之间的弹簧；所述容纳腔的腔壁处设置有用于安装所述弹簧的安装件，所述安装件形成有安装柱，所述弹簧靠近所述容纳腔的腔壁的一端套装在所述安装柱。
  8. 根据权利要求1所述的动力工具，其特征在于：
    所述质量件包括：
    主体部，与所述弹性元件连接；
    附加部，与所述主体部构成可拆卸连接。
  9. 根据权利要求1所述的动力工具，其特征在于：
    所述握持部的中心线经过所述质量件；
    所述弹性元件为两端分别设置在所述质量件和所述容纳腔的腔壁之间的弹 簧；
    在减振组件处于平衡状态下，所述弹簧在一个垂直于所述中心线的纵向平面内延伸。
  10. 根据权利要求1所述的动力工具，其特征在于：
    所述握持部的中心线经过所述质量件；
    所述弹性元件为设置在所述质量件和所述容纳腔的腔壁之间的弹簧，所述弹簧的延伸方向垂直于所述中心线；所述弹簧的数目为4，4个所述弹簧在围绕所述中心线的圆周方向上均匀设置。
  11. 根据权利要求1所述的动力工具，其特征在于：
    所述马达的驱动轴转动的轴线垂直于所述输出轴转动的轴线。
  12. 一种动力工具，包括：
    壳体，形成有用于供用户握持的主把手；
    马达，设置在所述壳体内，所述马达还具有驱动轴；
    工作头部，具有输出轴和连接在所述输出轴上的磨片，所述输出轴由所述马达驱动；
    传动组件，用于在所述驱动轴和所述输出轴之间实现动力的传递；
    其特征在于：
    所述动力工具还包括：
    辅助把手，可拆卸式安装至所述壳体靠近所述工作头部处，所述辅助把手包括沿一中心线延伸的握持部；
    所述辅助把手还包括：
    减振组件，包括至少一个质量件和若干弹性元件；
    其中，所述辅助把手内形成有用于容纳所述减振组件的容纳腔；若干所述弹性元件设置在所述质量件和所述容纳腔的腔壁之间；所述减振组件的固有频率W1与所述输出轴转动时的转动频率W2的比值大于等于0.7且小于等于1.3；
    至少一个所述质量件设置在一个垂直于所述中心线的纵向平面内，若干所述弹性元件中包括在所述纵向平面内沿第一方向将所述质量件连接到所述容纳腔内的第一弹性元件组和沿相对所述第一方向垂直的第二方向将所述质量件连接到所述容纳腔内的第二弹性元件组。
  13. 根据权利要求12所述的动力工具，其特征在于：
    所述容纳腔具有腔壁，所述腔壁处分别设置有用于安装所述第一弹性元件组和第二弹性元件组的安装件。
  14. 一种动力工具，包括：
    壳体，形成有用于供用户握持的主把手；
    马达，设置在所述壳体内；
    工作头部，具有输出轴，所述输出轴由所述马达驱动；
    其特征在于：
    所述动力工具还包括：
    辅助把手，可拆卸式安装至所述壳体靠近所述工作头部处；
    所述辅助把手还包括：
    减振组件，包括至少一个质量件和若干弹性元件；
    其中，所述辅助把手内形成有用于容纳所述减振组件的容纳腔；若干所述弹性元件设置在所述质量件和所述容纳腔的腔壁之间；所述减振组件的固有频率W1与所述输出轴转动时的转动频率W2的比值大于等于0.7且小于等于1.3；
    所述辅助把手包括沿一中心线延伸的握持部；至少一个所述质量件设置在一个垂直于所述中心线的纵向平面内，若干所述弹性元件中包括在所述纵向平面内沿第一方向将所述质量件连接到所述容纳腔内的第一弹性元件组和沿相对所述第一方向垂直的第二方向将所述质量件连接到所述容纳腔内的第二弹性元件组。
  15. 根据权利要求14所述的动力工具，其特征在于：
    所述容纳腔具有腔壁，所述腔壁处分别设置有用于安装所述第一弹性元件组和第二弹性元件组的安装件。
PCT/CN2018/092260 2017-08-31 2018-06-21 动力工具 WO2019041983A1 (zh)

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EP3628447A1 (en) 2020-04-01
EP3628447B1 (en) 2021-08-25
US10890229B2 (en) 2021-01-12
US20200149609A1 (en) 2020-05-14
CN109421033A (zh) 2019-03-05
CN109421033B (zh) 2024-03-15

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