WO2019206022A1 - Electric tool - Google Patents

Electric tool Download PDF

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Publication number
WO2019206022A1
WO2019206022A1 PCT/CN2019/083292 CN2019083292W WO2019206022A1 WO 2019206022 A1 WO2019206022 A1 WO 2019206022A1 CN 2019083292 W CN2019083292 W CN 2019083292W WO 2019206022 A1 WO2019206022 A1 WO 2019206022A1
Authority
WO
WIPO (PCT)
Prior art keywords
impact portion
impact
unloading position
power source
power tool
Prior art date
Application number
PCT/CN2019/083292
Other languages
French (fr)
Chinese (zh)
Inventor
郑祥格
谢炬烽
Original Assignee
博世电动工具（中国）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 博世电动工具（中国）有限公司 filed Critical 博世电动工具（中国）有限公司
Priority to DE112019002136.2T priority Critical patent/DE112019002136T5/en
Publication of WO2019206022A1 publication Critical patent/WO2019206022A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/04—Portable percussive tools with electromotor or other motor drive in which the tool bit or anvil is hit by an impulse member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0023—Tools having a percussion-and-rotation mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0015—Anvils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0019—Guide-sleeves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/191—Ram catchers for stopping the ram when entering idling mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/371—Use of springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/385—Use of thrust-washers, e.g. for limiting the course of the impulse member

Definitions

  • the present application relates to a power tool, and more particularly to a power tool having a reset mechanism.
  • electric hammers and electric drills are very mature power tools.
  • electric hammer is used for impact and drilling
  • electric drill is mainly used for drilling.
  • these power tools usually use different drill bits, such as: shank drills, round shank drills or hex drills.
  • shank drills round shank drills or hex drills.
  • drill bit There is a part of a drill bit having a relatively small size. For these drill bits, if they are not fully clamped during assembly or during standby, the drill bit may be impacted and ejected due to misoperation. Induced a safety incident.
  • the main technical problem to be solved by the present application is to provide a tool clamping system that improves the erroneous operation condition.
  • the present application provides a power tool including: a clamping device for clamping or releasing a drill bit; an impact device including an impact portion of the driven drill bit and for providing power a power source; wherein the impact portion has a carrying position and an unloading position, and is reciprocable between the carrying position and the unloading position; at the carrying position, the impact portion is coupled to the power source and Capable of impacting the drill bit; at the unloading position, the impact portion is decoupled from the power source; and a reset mechanism for providing a restoring force that maintains the impact portion in an unloading position; When the force of the impact portion is smaller than the restoring force provided by the reset mechanism, the impact portion is held at the unloading position.
  • the resetting force is provided by the reset mechanism to maintain the impact portion in the unloading position; when the force is not pressed against the workpiece or when the force transmitted from the drill bit to the impact portion is less than the reset force provided by the reset mechanism, Keep the impact portion in the unloading position, effectively avoiding various misoperations.
  • FIG. 1 shows a schematic cross-sectional view of a power tool of an embodiment.
  • a power tool includes: a clamping device 100 for clamping or releasing the drill bit 400 ; an impact portion 210 having a driven impact drill bit 400 and An impact device 200 of a power source of power; and a reset mechanism 300 for providing a restoring force that holds the impact portion 210 at the unloading position b.
  • the impact portion 210 has a bearing position a and an unloading position b, and is reciprocable between the carrying position a and the unloading position b; when the impact portion 210 is moved to the carrying position a, the impact portion 210 is coupled with the power source and can Impacting the drill bit 400; when the impact portion 210 is moved to the unloading position b, the impact portion 210 is decoupled from the power source; and the resetting mechanism 300 is used to provide a restoring force for holding the impact portion in the unloading position, which can prevent the workpiece from being pressed against the workpiece When the force transmitted to the impact portion 210 by the drill bit 400 is less than the restoring force provided by the reset mechanism 300, the impact portion 210 is held at the unloading position b, thereby effectively avoiding various erroneous operations.
  • the components of the clamping device 100, the impact device 200, and the reset mechanism 300 of the power tool will be described one by one below.
  • the clamping device may be a clamping device that is more common in the field of power tools, or may be some improved clamping device, as long as it can be coupled with the impact device and the reset mechanism described in the embodiments of the present application. can,.
  • Some structural features of a clamping device will be described herein in connection with Figure 1 for a better understanding of the present teachings.
  • the clamping device 100 includes a base 110.
  • the base body 110 is provided with a mounting hole extending in the axial direction.
  • the mounting hole extends to one end of the assembly or removal port of each type of drill bit to load or take out various types of drill bits, and this end is defined as a front end in this embodiment.
  • the other end extends to an impact device as described hereinafter to facilitate driving the loaded drill bit to perform a work task, and this end is defined as a rear end in the present solution.
  • a first type of through hole and a second type of through hole are sequentially disposed in the base 110.
  • three first type of through holes are inclined toward the front end and penetrate the base body 110 for inserting the jaws 120 and thereby performing a clamping or releasing operation on the round shank bit.
  • a second type of through hole is inclined toward the front end and penetrates the base body 110 for inserting the lock pin 130 and thereby performing a clamping or releasing operation on the shank bit.
  • a dust cover 140 may be added to the front end of the mounting hole to prevent dust from entering the mounting hole of the tool in a state where the use is stopped.
  • the aforementioned clamping device 100 is coupled to the impact device 200 by balls 500.
  • the impact device 200 is configured as a tube 230, and the impact portion 210 is disposed within the tube 230 and is capable of reciprocating motion along the tube 230 when driven, and being driven by the power source as it moves toward the rear end.
  • the assembled drill bit 400 is impacted, and the drill bit 400 is driven to impact the workpiece to meet the processing requirements.
  • the impact device 200 further includes a transmission portion 220 disposed between the impact portion 210 and the power source, which is capable of coupling with the power source and transmitting power to the impact portion 210; wherein the impact portion 210 is at the bearing position a When it is coupled to the power source via the transmission portion 220, and can impact the drill bit 400; when the impact portion 210 is at the unloading position b, the impact portion 210 is decoupled from the transmission portion 220, and is no longer driven, so that it can remain stationary. .
  • the impact device 200 further includes a guiding bushing 240 disposed around the impact portion 210, and the guiding bushing 240 is provided with a receiving groove 241 on a side close to the transmission portion 220; wherein, at the unloading position b, The transmission portion 220 is held in the accommodating groove 241 and is decoupled from the power source; thereby achieving the holding of the transmission portion, so that it does not need to continue to be subjected to the power source drive to perform the impact action in the non-operating state.
  • the impact portion 210 pushes the transmission portion 220 out of the accommodating groove 241, and the transmission portion 220 is coupled to the power source and is capable of impacting the drill bit 400.
  • the first accommodating cavity 242 is disposed in the guiding bushing 240 in the axial direction, and the resetting mechanism 300 is disposed in the first accommodating cavity 242; wherein, at the unloading position b, the resetting mechanism 300 abuts the impacting portion 210 Pressing on the first receiving cavity 242 away from the first side of the power source. This provides an interval to limit the impact portion 210, ensuring that it can move between the load bearing position a and the unloading position b.
  • the impact device 200 may further include a thrust ring 250 disposed around the impact portion 210, and the thrust ring 250 is used to provide the impact portion 210 with energy for buffering and absorbing the impact portion 210 to avoid impact portions.
  • 210 collides with tube 230 rigidly and excessively wears.
  • the second accommodating cavity 251 can be disposed in the axial direction of the thrust ring 250, and the second accommodating cavity 251 and the first accommodating cavity 242 enclose an accommodating space c; wherein, at the unloading position b, the resetting mechanism 300 presses the impact portion 210 against the first end of the accommodating space c away from the power source. This results in a complete cavity space to limit the impact portion 210, ensuring that it can move between the load bearing position a and the unloading position b.
  • the guide bushing does not have a first receiving cavity, but it is placed against the end face on the side facing away from the transmission. At this time, the first end of the reset mechanism is supported on the abutting end surface, and the second end of the reset mechanism applies a restoring force to the impact portion. This also makes it possible to press the impact portion to the unloading position b without any external force.
  • connection methods can be used between the reset mechanism 300 and the impact portion to achieve reliable transmission of force.
  • the impact portion 210 is provided with a boss 211 in the circumferential direction, and the reset mechanism 300 directly or indirectly abuts against the boss 211 to apply a restoring force to the impact portion 210.
  • the reset mechanism 300 includes a resilient member 310 that retains the impact portion 210 against unloading when the force transmitted by the drill bit 400 to the impact portion 210 is less than the spring force provided by the resilient member 310. Position b.
  • the power tool may be a hammer, a hammer drill or a hand-held drill.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

Provided is an electric tool. The electric tool comprises: a clamping device (100), used for clamping or releasing a drilling bit; an impact device (200), comprising an impact part (210) driven to impact the drilling bit and a power supply for supplying power, wherein the impact part (210) is provided with a loading position (a) and an unloading position (b), and can make a reciprocating movement between the loading position (a) and the unloading position (b), when being at the loading position (a), the impact part (210) is coupled to the power supply and can impact the drilling bit, and when being at the unloading position (b), the impact part (210) is decoupled from the power supply; and a reset mechanism (300), used for providing a reset force to keep the impact part (210) at the unloading position (b), wherein when a force transferred from the drilling bit to the impact part (210) is less than the reset force provided by the reset mechanism (300), the impact part (210) is kept at the unloading position (b). The electric tool can keep the impact part at the unloading position when the drilling bit abuts against a workpiece, thereby effectively avoiding various misoperations.

Description

电动工具electrical tools 技术领域Technical field
本申请涉及电动工具，尤其涉及一种具有复位机构的电动工具。The present application relates to a power tool, and more particularly to a power tool having a reset mechanism.
背景技术Background technique
在现有技术中，电锤及电钻均为十分成熟的电动工具。其中，电锤用于冲击及钻孔，而电钻则主要用于钻孔。为实现不同的功能，这些电动工具通常会应用不同的钻头，例如：槽柄钻头、圆柄钻头或六角钻头等。其中存在一部分具有相对较小尺寸的钻头，对于这些钻头而言，若在装配过程中或待机过程中其未被完全夹紧，则极可能因误操作而导致钻头受到冲击并被射出，由此诱发安全事故。In the prior art, electric hammers and electric drills are very mature power tools. Among them, electric hammer is used for impact and drilling, while electric drill is mainly used for drilling. To achieve different functions, these power tools usually use different drill bits, such as: shank drills, round shank drills or hex drills. There is a part of a drill bit having a relatively small size. For these drill bits, if they are not fully clamped during assembly or during standby, the drill bit may be impacted and ejected due to misoperation. Induced a safety incident.
发明内容Summary of the invention
本申请要解决的主要技术问题是提供改善误操作状况的工具夹持***。The main technical problem to be solved by the present application is to provide a tool clamping system that improves the erroneous operation condition.
为解决上述技术问题，一方面本申请提供一种电动工具，其包括：夹持装置，其用于夹持或释放钻头；冲击装置，其包括受驱而冲击钻头的冲击部以及用于提供动力的动力源；其中，所述冲击部具有承载位置及卸载位置，并能够在所述承载位置与卸载位置之间往复运动；在所述承载位置处，所述冲击部与所述动力源耦合并能够冲击钻头；在所述卸载位置处，所述冲击部与所述动力源解除耦合；以及复位机构，其用于提供将所述冲击部保持在卸载位置的复位力；在钻头传递至所述冲击部的力小于所述复位机构提供的复位力时，所述冲击部被保持在卸载位置。In order to solve the above technical problem, in one aspect, the present application provides a power tool including: a clamping device for clamping or releasing a drill bit; an impact device including an impact portion of the driven drill bit and for providing power a power source; wherein the impact portion has a carrying position and an unloading position, and is reciprocable between the carrying position and the unloading position; at the carrying position, the impact portion is coupled to the power source and Capable of impacting the drill bit; at the unloading position, the impact portion is decoupled from the power source; and a reset mechanism for providing a restoring force that maintains the impact portion in an unloading position; When the force of the impact portion is smaller than the restoring force provided by the reset mechanism, the impact portion is held at the unloading position.
根据本申请的技术方案，通过设置复位机构来提供将冲击部保持在卸载位置的复位力；能够在钻头未抵压工件时或在钻头传递至冲击部的力小于复位机构提供的复位力时，将冲击部保持在卸载位置，有效避免各种误操作。According to the technical solution of the present application, the resetting force is provided by the reset mechanism to maintain the impact portion in the unloading position; when the force is not pressed against the workpiece or when the force transmitted from the drill bit to the impact portion is less than the reset force provided by the reset mechanism, Keep the impact portion in the unloading position, effectively avoiding various misoperations.
附图说明DRAWINGS
结合附图参阅以下具体实施方式的详细说明，将更加充分地理解本申请，附图中同样的附图标记指代视图中同样的元件。其中：The present application will be more fully understood from the following detailed description of the embodiments of the invention. among them:
图1显示一种具体实施方式的电动工具沿轴向剖视的示意图。1 shows a schematic cross-sectional view of a power tool of an embodiment.
具体实施方式detailed description
请结合参阅图1所示，根据本申请一种具体实施方式的电动工具包括：用于夹持或释放钻头400的夹持装置100；具有受驱而冲击钻头400的冲击部210以及 用于提供动力的动力源的冲击装置200；以及用于提供将冲击部210保持在卸载位置b的复位力的复位机构300。其中，冲击部210具有承载位置a及卸载位置b，并能够在承载位置a与卸载位置b之间往复运动；当冲击部210运动至承载位置a处时，冲击部210与动力源耦合并能够冲击钻头400；当冲击部210运动至卸载位置b处时，冲击部210与动力源解除耦合；并通过复位机构300来提供将冲击部保持在卸载位置的复位力，能够在钻头未抵压工件时或在钻头400传递至冲击部210的力小于复位机构300提供的复位力时，将冲击部210保持在卸载位置b，从而有效避免各种误操作。Referring to FIG. 1 , a power tool according to an embodiment of the present application includes: a clamping device 100 for clamping or releasing the drill bit 400 ; an impact portion 210 having a driven impact drill bit 400 and An impact device 200 of a power source of power; and a reset mechanism 300 for providing a restoring force that holds the impact portion 210 at the unloading position b. Wherein, the impact portion 210 has a bearing position a and an unloading position b, and is reciprocable between the carrying position a and the unloading position b; when the impact portion 210 is moved to the carrying position a, the impact portion 210 is coupled with the power source and can Impacting the drill bit 400; when the impact portion 210 is moved to the unloading position b, the impact portion 210 is decoupled from the power source; and the resetting mechanism 300 is used to provide a restoring force for holding the impact portion in the unloading position, which can prevent the workpiece from being pressed against the workpiece When the force transmitted to the impact portion 210 by the drill bit 400 is less than the restoring force provided by the reset mechanism 300, the impact portion 210 is held at the unloading position b, thereby effectively avoiding various erroneous operations.
下文将对该电动工具的夹持装置100、冲击装置200及复位机构300等部件逐一描述。The components of the clamping device 100, the impact device 200, and the reset mechanism 300 of the power tool will be described one by one below.
该夹持装置可以是在电动工具领域内较为常见的夹持装置，也可以是一些改进的夹持装置，只要其能够与本申请的实施例中述及的冲击装置及复位机构能够配合连接即可，。在此将结合图1描述一种夹持装置的部分结构特征，以便更好地理解本构想。具体而言，夹持装置100包括基体110。其中，该基体110内设置沿轴向贯通的安装孔，该安装孔一端延伸至各类钻头的装配或拆卸口，以便装入或取出各类钻头，且此端在本方案中定义为前端。另一端则延伸至连接后文所述的冲击装置，以便于其对装入的钻头进行驱动，执行作业任务，且此端在本方案中定义为后端。The clamping device may be a clamping device that is more common in the field of power tools, or may be some improved clamping device, as long as it can be coupled with the impact device and the reset mechanism described in the embodiments of the present application. can,. Some structural features of a clamping device will be described herein in connection with Figure 1 for a better understanding of the present teachings. Specifically, the clamping device 100 includes a base 110. The base body 110 is provided with a mounting hole extending in the axial direction. The mounting hole extends to one end of the assembly or removal port of each type of drill bit to load or take out various types of drill bits, and this end is defined as a front end in this embodiment. The other end extends to an impact device as described hereinafter to facilitate driving the loaded drill bit to perform a work task, and this end is defined as a rear end in the present solution.
在图1中从左往右的方向上，基体110内还依次设置有第一类通孔及第二类通孔。其中，在该实施例中，三个第一类通孔朝向前端倾斜并贯穿该基体110，其用于插设夹爪120且由此实现对圆柄钻头的夹持或释放操作。另外，一个第二类通孔朝向前端倾斜并贯穿该基体110，其用于插设锁止销130且由此实现对槽柄钻头的夹持或释放操作。In the direction from left to right in FIG. 1, a first type of through hole and a second type of through hole are sequentially disposed in the base 110. Therein, in this embodiment, three first type of through holes are inclined toward the front end and penetrate the base body 110 for inserting the jaws 120 and thereby performing a clamping or releasing operation on the round shank bit. In addition, a second type of through hole is inclined toward the front end and penetrates the base body 110 for inserting the lock pin 130 and thereby performing a clamping or releasing operation on the shank bit.
此外，还可在其安装孔前端增设防尘盖140，以避免在停止使用的状态下灰尘进入工具的安装孔内。In addition, a dust cover 140 may be added to the front end of the mounting hole to prevent dust from entering the mounting hole of the tool in a state where the use is stopped.
前述的夹持装置100通过滚珠500连接至冲击装置200。The aforementioned clamping device 100 is coupled to the impact device 200 by balls 500.
继续参见图1，该冲击装置200被配置成管230，且冲击部210设置在管230内，并能够在受到驱动时沿管230发生往复运动，在其朝后端运动时受到动力源的驱动，而朝前运动时撞击装配好的钻头400，进而驱动钻头400来冲击工件，实现加工需求。With continued reference to Figure 1, the impact device 200 is configured as a tube 230, and the impact portion 210 is disposed within the tube 230 and is capable of reciprocating motion along the tube 230 when driven, and being driven by the power source as it moves toward the rear end. When the frontward movement, the assembled drill bit 400 is impacted, and the drill bit 400 is driven to impact the workpiece to meet the processing requirements.
该冲击装置200还包括传动部220，传动部220设置在冲击部210与动力源之间，其能够与动力源耦合并将动力传递至冲击部210；其中，在冲击部210处于承载位置a处时，其经由传动部220与动力源耦合，并能够冲击钻头400；而在冲击部210处于卸载位置b处时，冲击部210与传动部220解除耦合，进而不再受到驱动，故可保持静止。The impact device 200 further includes a transmission portion 220 disposed between the impact portion 210 and the power source, which is capable of coupling with the power source and transmitting power to the impact portion 210; wherein the impact portion 210 is at the bearing position a When it is coupled to the power source via the transmission portion 220, and can impact the drill bit 400; when the impact portion 210 is at the unloading position b, the impact portion 210 is decoupled from the transmission portion 220, and is no longer driven, so that it can remain stationary. .
此外，该冲击装置200还包括引导衬套240，引导衬套240环绕冲击部210设置，且引导衬套240在靠近传动部220的一侧设置容置槽241；其中，在卸载位置b处，传动部220被保持在容置槽241内，并与动力源解除耦合；由此实现了对传动部的固持，使其在非工作状态下无需继续经受动力源驱动而执行冲击动作。而在承载位置a处，冲击部210将传动部220推出容置槽241，传动部220与动力源耦合并能够冲击钻头400。In addition, the impact device 200 further includes a guiding bushing 240 disposed around the impact portion 210, and the guiding bushing 240 is provided with a receiving groove 241 on a side close to the transmission portion 220; wherein, at the unloading position b, The transmission portion 220 is held in the accommodating groove 241 and is decoupled from the power source; thereby achieving the holding of the transmission portion, so that it does not need to continue to be subjected to the power source drive to perform the impact action in the non-operating state. At the load-bearing position a, the impact portion 210 pushes the transmission portion 220 out of the accommodating groove 241, and the transmission portion 220 is coupled to the power source and is capable of impacting the drill bit 400.
更具体而言，引导衬套240内沿轴向设置第一容置腔242，复位机构300设置在第一容置腔242内；其中，在卸载位置b处，复位机构300将冲击部210抵压在第一容置腔242远离动力源的第一侧。由此提供了一个区间来限制冲击部210，确保其能够在承载位置a与卸载位置b之间发生运动。More specifically, the first accommodating cavity 242 is disposed in the guiding bushing 240 in the axial direction, and the resetting mechanism 300 is disposed in the first accommodating cavity 242; wherein, at the unloading position b, the resetting mechanism 300 abuts the impacting portion 210 Pressing on the first receiving cavity 242 away from the first side of the power source. This provides an interval to limit the impact portion 210, ensuring that it can move between the load bearing position a and the unloading position b.
可选地，该冲击装置200还可包括止推环250，止推环250环绕冲击部210设置，且止推环250用于为冲击部210提供缓冲和吸收冲击部210的能量，以免冲击部210与管230刚性碰撞而过度磨损。Optionally, the impact device 200 may further include a thrust ring 250 disposed around the impact portion 210, and the thrust ring 250 is used to provide the impact portion 210 with energy for buffering and absorbing the impact portion 210 to avoid impact portions. 210 collides with tube 230 rigidly and excessively wears.
此时，止推环250内沿轴向可设置第二容置腔251，第二容置腔251与第一容置腔242围成容置空间c；其中，在卸载位置b处，复位机构300将冲击部210抵压在容置空间c远离动力源的第一端。由此形成一个完整的腔体空间来限制冲击部210，确保其能够在承载位置a与卸载位置b之间发生运动。At this time, the second accommodating cavity 251 can be disposed in the axial direction of the thrust ring 250, and the second accommodating cavity 251 and the first accommodating cavity 242 enclose an accommodating space c; wherein, at the unloading position b, the resetting mechanism 300 presses the impact portion 210 against the first end of the accommodating space c away from the power source. This results in a complete cavity space to limit the impact portion 210, ensuring that it can move between the load bearing position a and the unloading position b.
在另一个未示出的实施例中，该引导衬套不具有第一容置腔，但其在背离传动部的一侧设置抵靠端面。此时，复位机构的第一端支承在抵靠端面上，且复位机构的第二端向冲击部施加复位力。由此同样可以实现在无其他外力的情况下将冲击部抵压至卸载位置b。In another embodiment, not shown, the guide bushing does not have a first receiving cavity, but it is placed against the end face on the side facing away from the transmission. At this time, the first end of the reset mechanism is supported on the abutting end surface, and the second end of the reset mechanism applies a restoring force to the impact portion. This also makes it possible to press the impact portion to the unloading position b without any external force.
而复位机构300与冲击部之间则可采用多种连接方式来实现力的可靠传递。例如，冲击部210沿周向设置凸台211，复位机构300直接或间接抵靠凸台211来向冲击部210施加复位力。A variety of connection methods can be used between the reset mechanism 300 and the impact portion to achieve reliable transmission of force. For example, the impact portion 210 is provided with a boss 211 in the circumferential direction, and the reset mechanism 300 directly or indirectly abuts against the boss 211 to apply a restoring force to the impact portion 210.
此外，作为一种具体的实现形式，该复位机构300包括弹性元件310，在 钻头400传递至冲击部210的力小于弹性元件310提供的弹力时，弹性元件310将冲击部210保持抵压在卸载位置b处。Moreover, as a specific implementation, the reset mechanism 300 includes a resilient member 310 that retains the impact portion 210 against unloading when the force transmitted by the drill bit 400 to the impact portion 210 is less than the spring force provided by the resilient member 310. Position b.
当然，在上文所列举的若干实施例的教示下，可知该复位机构的具体设置位置与结构形式存在多种改型，只要其能够实现对冲击部施加复位力，以便在冲击部不经受其他外力时能够被保持在卸载位置b处即可。Of course, in the teachings of the several embodiments listed above, it can be seen that there are various modifications to the specific arrangement position and structural form of the reset mechanism, as long as it can realize the application of a restoring force to the impact portion so as not to withstand the impact portion. The external force can be maintained at the unloading position b.
此外，作为具体应用的示例，该电动工具可以是电锤、冲击钻或手持钻机。Further, as an example of a specific application, the power tool may be a hammer, a hammer drill or a hand-held drill.
以上具体实施方式仅用于说明本申请，而并非对本申请的限制。为说明相对位置关系，本申请中使用了左右、上下等相对的方位术语，并非对于绝对位置的限定。有关技术领域的普通技术人员，在不脱离本申请的范围的情况下，还可以对本申请的技术方案做出各种变化和变型，因此所有等同的技术方案也属于本申请的范畴，本申请的专利保护范围应由权利要求限定。The above specific embodiments are merely illustrative of the present application and are not intended to limit the application. In order to explain the relative positional relationship, the relative orientation terms such as left and right, up and down, etc. are used in the present application, and are not limited to the absolute position. A person skilled in the art can make various changes and modifications to the technical solutions of the present application without departing from the scope of the present application. Therefore, all equivalent technical solutions are also within the scope of the present application. The scope of patent protection shall be defined by the claims.

Claims (10)

  1. 一种电动工具，其特征在于，包括：A power tool characterized by comprising:
    夹持装置(100)，其用于夹持或释放钻头(400)；a clamping device (100) for clamping or releasing the drill bit (400);
    冲击装置(200)，其包括受驱而冲击钻头(400)的冲击部(210)以及用于提供动力的动力源；其中，所述冲击部(210)具有承载位置(a)及卸载位置(b)，并能够在所述承载位置(a)与卸载位置(b)之间往复运动；在所述承载位置(a)处，所述冲击部(210)与所述动力源耦合并能够冲击钻头(400)；在所述卸载位置(b)处，所述冲击部(210)与所述动力源解除耦合；以及An impact device (200) including an impact portion (210) of the driven drill bit (400) and a power source for providing power; wherein the impact portion (210) has a load bearing position (a) and an unloading position ( b) and capable of reciprocating between the carrying position (a) and the unloading position (b); at the carrying position (a), the impact portion (210) is coupled to the power source and is capable of impacting a drill bit (400); at the unloading position (b), the impact portion (210) is decoupled from the power source;
    复位机构(300)，其用于提供将所述冲击部(210)保持在卸载位置(b)的复位力；在钻头(400)传递至所述冲击部(210)的力小于所述复位机构(300)提供的复位力时，所述冲击部(210)被保持在卸载位置(b)。a reset mechanism (300) for providing a restoring force to hold the impact portion (210) in the unloading position (b); a force transmitted to the impact portion (210) at the drill bit (400) is less than the reset mechanism (300) When the restoring force is provided, the impact portion (210) is held at the unloading position (b).
  2. 根据权利要求1所述的电动工具，其特征在于，还包括传动部(220)，所述传动部(220)设置在所述冲击部(210)与所述动力源之间，其能够与所述动力源耦合并将动力传递至冲击部(210)；其中，在所述承载位置(a)处，所述冲击部(210)与所述传动部(220)耦合并能够冲击钻头(400)；在所述卸载位置(b)处，所述冲击部(210)与所述传动部(220)解除耦合。The power tool according to claim 1, further comprising a transmission portion (220) disposed between the impact portion (210) and the power source, which is capable of The power source is coupled and transmits power to the impact portion (210); wherein, at the load bearing position (a), the impact portion (210) is coupled to the transmission portion (220) and is capable of impacting the drill bit (400) At the unloading position (b), the impact portion (210) is decoupled from the transmission portion (220).
  3. 根据权利要求2所述的电动工具，其特征在于，还包括引导衬套(240)，所述引导衬套(240)环绕所述冲击部(210)设置，且所述引导衬套(240)在靠近所述传动部(220)的一侧设置容置槽(241)；其中，在所述卸载位置(b)处，所述传动部(220)被保持在所述容置槽(241)内，并与所述动力源解除耦合；在所述承载位置(a)处，所述冲击部(210)将所述传动部(220)推出所述容置槽(241)，所述传动部(220)与动力源耦合并能够冲击钻头(400)。The power tool according to claim 2, further comprising a guide bushing (240) disposed around the impact portion (210), and the guide bushing (240) a receiving groove (241) is disposed on a side close to the transmission portion (220); wherein, at the unloading position (b), the transmission portion (220) is held in the receiving groove (241) Disconnecting from the power source; at the carrying position (a), the impact portion (210) pushes the transmission portion (220) out of the receiving groove (241), the transmission portion (220) coupled to the power source and capable of impacting the drill bit (400).
  4. 根据权利要求3所述的电动工具，其特征在于，所述引导衬套(240)内沿轴向设置第一容置腔(242)，所述复位机构(300)设置在所述第一容置腔(242)内；其中，在所述卸载位置(b)处，所述复位机构(300)将所述冲击部(210)抵压在所述第一容置腔(242)远离所述动力源的第一侧。The electric power tool according to claim 3, wherein a first accommodating cavity (242) is axially disposed in the guide bushing (240), and the reset mechanism (300) is disposed at the first accommodating Inside the cavity (242); wherein, at the unloading position (b), the reset mechanism (300) presses the impact portion (210) against the first receiving cavity (242) away from the The first side of the power source.
  5. 根据权利要求4所述的电动工具，其特征在于，还包括止推环(250)，所述止推环(250)环绕所述冲击部(210)设置，且所述止推环(250)用于为所述冲击部(210)提供缓冲。The power tool according to claim 4, further comprising a thrust ring (250) disposed around the impact portion (210), and the thrust ring (250) Used to provide cushioning for the impact portion (210).
  6. 根据权利要求5所述的电动工具，其特征在于，所述止推环(250)内沿轴向设置第二容置腔(251)，所述第二容置腔(251)与所述第一容置腔(242)围成容置空间(c)；其中，在所述卸载位置(b)处，所述复位机构(300)将所述冲击部(210)抵压在所述容置空间(c)远离所述动力源的第一端。The electric power tool according to claim 5, wherein a second accommodating cavity (251) is disposed in the thrust ring (250), the second accommodating cavity (251) and the first An accommodating cavity (242) encloses an accommodating space (c); wherein, at the unloading position (b), the resetting mechanism (300) presses the impact portion (210) against the accommodating portion The space (c) is remote from the first end of the power source.
  7. 根据权利要求3所述的电动工具，其特征在于，所述引导衬套(240)在背离所述传动部(220)的一侧设置抵靠端面，所述复位机构(300)的第一端支承在所述抵靠端面上，且复位机构(300)的第二端向所述冲击部(210)施加复位力。The power tool according to claim 3, wherein said guide bushing (240) is disposed against an end surface on a side facing away from said transmission portion (220), and said first end of said reset mechanism (300) Supported on the abutting end face, and the second end of the reset mechanism (300) applies a restoring force to the impact portion (210).
  8. 根据权利要求1至7任意一项所述的电动工具，其特征在于，所述复位机构(300)包括弹性元件(310)，在钻头(400)传递至所述冲击部(210)的力小于所述弹性元件(310)提供的弹力时，所述弹性元件(310)将所述冲击部(210)保持抵压在卸载位置(b)处。The power tool according to any one of claims 1 to 7, wherein the reset mechanism (300) includes a resilient member (310), and a force transmitted to the impact portion (210) at the drill bit (400) is less than When the elastic element (310) provides an elastic force, the elastic member (310) holds the impact portion (210) against the unloading position (b).
  9. 根据权利要求1至7任意一项所述的电动工具，其特征在于，所述冲击部(210)沿周向设置凸台(211)，所述复位机构(300)抵靠所述凸台(211)来向所述冲击部(210)施加复位力。The electric power tool according to any one of claims 1 to 7, characterized in that the impact portion (210) is provided with a boss (211) in the circumferential direction, and the reset mechanism (300) abuts against the boss ( 211) to apply a restoring force to the impact portion (210).
  10. 根据权利要求1至7任意一项所述的电动工具，其特征在于，所述电动工具包括：电锤、冲击钻或手持钻机。The electric power tool according to any one of claims 1 to 7, wherein the electric power tool comprises: an electric hammer, a hammer drill or a hand-held drill.
PCT/CN2019/083292 2018-04-24 2019-04-18 Electric tool WO2019206022A1 (en)

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