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CN-114619406-B - Electric tool

CN114619406BCN 114619406 BCN114619406 BCN 114619406BCN-114619406-B

Abstract

The application provides an electric tool. The electric tool comprises a shell, an impact pin, a buffer ring, a hammer tube, a sliding sleeve and a transmission assembly, wherein the first stop part is radially protruded on the inner wall of the shell, the impact pin is arranged in the shell, the middle section of the impact pin is provided with a shoulder part which is radially protruded on the inner wall of the shell, the buffer ring is sleeved on the impact pin and is arranged between the first stop part in the shell and the shoulder part of the impact pin, the hammer is arranged in the shell and is abutted against the impact pin, the hammer tube is used for accommodating the hammer, an unloading hole which is communicated with the inner wall and the outer wall of the hammer tube is formed in the hammer tube, the hammer is driven to reciprocate in the hammer tube, the sliding sleeve is sleeved on the outer wall of the hammer tube and is controlled to reciprocate along the outer wall of the hammer tube, and the sliding sleeve is provided with a first state exposing the unloading hole and a second state closing the unloading hole. According to the technical scheme, the displacement change of the impact pin is transmitted to the sliding sleeve, and meanwhile, the transmission of high-frequency vibration of the impact pin is avoided, so that the reliability of the electric tool is improved.

Inventors

  • SONG CHUNLEI
  • CHEN HONGQUN

Assignees

  • 博世电动工具（中国）有限公司

Dates

Publication Date
20260512
Application Date
20201214

Claims (10)

  1. 1. A power tool, comprising: A housing (100) having a radially protruding first stopper (111) provided on an inner wall thereof; an impact pin (120) disposed within the housing (100), and an intermediate section of the impact pin (120) having a radially protruding shoulder (121); A buffer ring (130) which is sleeved on the impact pin (120) and is arranged between a first stop part (111) in the shell (100) and a shoulder part (121) of the impact pin (120); a striker (140) provided in the housing (100) and abutting the impact pin (120); A hammer tube (150) for accommodating the hammer (140), and provided with an unloading hole (151) for communicating the inner wall and the outer wall of the hammer tube (150), wherein the hammer (140) is driven to reciprocate in the hammer tube (150); A sliding sleeve (160) which is sleeved on the outer wall of the hammer tube (150) and is controlled to reciprocate along the outer wall of the hammer tube (150), the sliding sleeve (160) having a first state in which the unloading hole (151) is exposed and a second state in which the unloading hole (151) is closed, and -A transmission assembly (200) for transmitting the displacement of the impact pin (120) to the sliding sleeve (160).
  2. 2. The power tool according to claim 1, wherein the transmission assembly (200) comprises a transmission ring (210) having an inner bore (211) with a smaller diameter than the diameter of the impact pin (120), and wherein the end of the impact pin (120) has a boss (122) that mates with the inner bore (211) of the transmission ring (210).
  3. 3. The power tool according to claim 2, wherein at least two openings (152) are provided in the first end (150 a) of the hammer tube (150), and the drive ring (210) comprises an outer periphery with at least two radially protruding tabs (212), the tabs (212) protruding out of the hammer tube (150) via the openings (152) and being adapted to transfer the displacement of the drive ring (210) to the slide sleeve (160).
  4. 4. The power tool of claim 3, wherein the drive assembly (200) further comprises a drive sleeve (220), the outer wall of the slip sleeve (160) has a radially protruding second stop (161), wherein the drive sleeve (220) is sleeved on the slip sleeve (160) and axially retained on a first side of the second stop (161), and wherein the drive sleeve (220) transmits displacement of the tab (212) to the slip sleeve (160).
  5. 5. The power tool according to claim 4, further comprising an elastic member (170) that is axially restrained at a second side of the second stopper (161) and pushes the slide sleeve (160) to a first state having the unloading hole (151) exposed when pressure is not applied.
  6. 6. The power tool of claim 4, wherein the drive sleeve (220) is made of plastic and the drive assembly (200) further comprises a metal transfer ring (231) disposed between the drive sleeve (220) and the drive ring (210), wherein the metal transfer ring (231) transfers displacement of the tab (212) to the slip sleeve (160).
  7. 7. The power tool according to claim 4, further comprising a transmission ring (232) fitted around the outer periphery of the transmission ring (210) via the tab (212), the transmission ring (232) protruding from the tab (212) toward the slide sleeve (160) in an axial direction, wherein the transmission ring (232) transmits displacement of the tab (212) to the slide sleeve (160).
  8. 8. The power tool of any one of claims 1 to 7, further comprising a first metal sheet (180 a) disposed between the buffer ring (130) and a shoulder (121) of the impact pin (120), and/or a second metal sheet (180 b) disposed between the buffer ring (130) and a first stop (111) within the housing (100).
  9. 9. The power tool according to any one of claims 1 to 7, wherein the first stop (111) is arranged circumferentially around an inner wall of the housing (100) and/or the shoulder (121) is arranged circumferentially around a middle section of the impact pin (120).
  10. 10. The power tool according to any one of claims 4 to 7, wherein the second stopper portion (161) is provided circumferentially around an outer wall of the slide sleeve (160).

Description

Electric tool Technical Field The present application relates to the field of power tools, and more particularly, to a power tool having a reciprocating transmission mechanism. Background In the prior art, for systems with vibration mechanisms such as electric hammers, impact hammers, etc., it is common to employ a piston and cylinder arrangement to provide the power. In order to avoid providing power in an undesirable manner, an unloading hole is usually provided in the hammer tube of such power tools, but the hammer tube can be used as a cylinder when the unloading hole is closed, and air pressure cannot be established in the hammer tube when the unloading hole is opened. At present, a sliding sleeve arranged outside the hammer tube is generally used for controlling the opening and closing of the unloading hole, and the sliding sleeve can be controlled by the displacement of the impact pin. Because, when the electric tool is brought into contact with the object to be machined, the impact pin will move toward the hammer tube side within the electric tool, thereby actuating the movement of the slide bushing directly or via the transmission assembly, and eventually achieving the association of the tool operating state with the open/closed state of the unloading hole. In the transmission process, the high-frequency vibration is often accompanied with the displacement change of the impact pin, so that the high-frequency vibration communication displacement change is transmitted to the transmission assembly and the sliding sleeve together, and further the parts are easy to damage, and the service life of the parts and the operation reliability of the electric tool are affected. Disclosure of Invention In view of the above, the present invention provides an improved power tool that effectively solves or mitigates one or more of the above-identified and other problems of the prior art. In order to solve one of the above technical problems, according to one aspect of the present application, there is provided a power tool including a housing having an inner wall provided with a radially protruding first stopper, a striking pin provided in the housing and having a radially protruding shoulder at a middle section thereof, a buffer ring sleeved on the striking pin and provided between the first stopper in the housing and the shoulder of the striking pin, a hammer provided in the housing and abutting against the striking pin, a hammer tube for accommodating the hammer and having an unloading hole opened thereon communicating an inner wall and an outer wall of the hammer tube, the hammer being drivingly reciprocated in the hammer tube, a slide bushing sleeved on the outer wall of the hammer tube and being controllably reciprocated along the outer wall of the hammer tube, the slide bushing having a first state of exposing the unloading hole and a second state of closing the unloading hole, and a transmission assembly for transmitting displacement of the striking pin to the slide bushing. According to the technical scheme, the buffer ring and the impact pin with the shoulder are arranged, so that the impact pin can buffer the linear motion of the impact pin towards the hammer pipe, the displacement of the impact pin can be smoothly transmitted to the sliding sleeve through the transmission assembly, the opening and closing of the unloading hole on the hammer pipe are further controlled, and the influence of high-frequency vibration of the impact pin on the sliding sleeve, the transmission assembly and other associated motion mechanisms is avoided. Drawings The present application will be more fully understood from the following detailed description of the specific embodiments, taken in conjunction with the accompanying drawings, in which like reference numerals refer to like elements in the drawings. Wherein: FIG. 1 is a schematic cross-sectional view of one embodiment of a power tool, with an upper half sectioned at a compressed position of an impact pin and drive assembly and a lower half sectioned at an uncompressed position of the impact pin and drive assembly, bounded by axes; FIG. 2 is a schematic perspective view of one embodiment of an impact pin of a power tool; FIG. 3 is a schematic perspective view of one embodiment of a drive ring of a power tool, and FIG. 4 is a schematic cross-sectional view of another embodiment of the power tool, with the upper half sectioned through the compressed position of the impact pin and drive assembly and the lower half sectioned through the uncompressed position of the impact pin and drive assembly, bounded by axes. Detailed Description The application will be described in detail hereinafter with reference to exemplary embodiments in the accompanying drawings. It should be understood, however, that this application may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclo