Transmission mechanism of impact tool and impact tool

Abstract

The impact tool comprises an output shaft, the transmission mechanism comprises a speed reduction structure and an impact structure, the speed reduction structure comprises a power output end, the output shaft is connected to the power output end, the impact structure comprises a first ratchet wheel, a second ratchet wheel and a function switching support, the first ratchet wheel is coupled to the output shaft, the first ratchet wheel comprises first teeth, and the second ratchet wheel comprises second teeth. The second ratchet wheel comprises a second tooth, a plurality of supporting parts surrounding the second tooth and notches formed between the adjacent supporting parts, and the supporting parts are arranged in the circumferential direction of the second tooth; the function switching support comprises an annular part, a plurality of convex parts and a stress part, and the stress part is configured to receive operating force so as to drive the function switching support to rotate; the first ratchet wheel is provided with a first position and a second position, and when the first ratchet wheel is located at the first position, the convex part is aligned with the supporting part and is supported by the supporting part; and when the first ratchet wheel is located at the second position, the convex part is aligned with the notch, so that the convex part can enter the notch, and the first teeth are meshed with the second teeth.

Description

Technical Field

[0001] The utility model relates to the field of tools, and particularly relates to a transmission mechanism of an impact tool and an impact tool. Background Art

[0002] An impact tool is a tool with an impact function. Typical examples include an impact drill, an impact wrench, etc. Taking an impact drill as an example, in the impact mode, the output shaft makes a rotational motion and an impact motion; in the non-impact mode, the output shaft only makes a rotational motion. However, the transmission mechanism of the existing impact drill is relatively complex. The transmission mechanism includes a deceleration structure and an impact structure. The deceleration structure is usually a deceleration gear set, and the impact structure usually includes a moving ratchet, a static ratchet, a moving ratchet support element, a function switching ring, a bearing, a spring, etc. The large number of components leads to high assembly difficulty and increased cost. Summary of the Utility Model

[0003] The purpose of this application is to overcome the deficiencies in the prior art and provide a transmission mechanism of an electric tool and an electric tool with a simpler structure. The utility model is realized through the following technical solutions:

[0004] A transmission mechanism of an impact tool, the impact tool includes an output shaft, the transmission mechanism includes a deceleration structure and an impact structure, the deceleration structure includes a power output end, the output shaft is connected to the power output end, the impact structure includes a first ratchet, a second ratchet and a function switching bracket. The first ratchet is coupled to the output shaft. The first ratchet includes a first tooth facing the second ratchet. The second ratchet includes a second tooth, a plurality of support portions surrounding the second tooth, and a notch formed between adjacent support portions. The plurality of support portions are arranged circumferentially along the second tooth. The function switching bracket includes an annular portion, a plurality of convex portions and a force-receiving portion. The plurality of convex portions extend outward from the annular portion and are arranged circumferentially along the annular portion. The force-receiving portion is configured to receive an operating force to drive the function switching bracket to rotate. The first ratchet has a first position and a second position. When the first ratchet is in the first position, the convex portion is aligned with the support portion and is supported by the support portion. When the first ratchet is in the second position, the convex portion is aligned with the notch, so that the convex portion can enter the notch to realize the engagement of the first tooth and the second tooth.

[0005] Further, the impact structure further includes an elastic member and a bearing, and the first ratchet is biased by the elastic member against the bearing.

[0006] Further, the number of the support portions and the notch is equal and not less than 5, providing greater supporting force, making the cooperation between the convex portion and the notch or the support portion more stable and not easily deformed.

[0007] Further, the number of the convex portions is equal to the number of the supporting portions, and the force-receiving portion extends from one of the convex portions.

[0008] Further, the force-receiving portion is Z-shaped, and the force-receiving portion is integrally formed with the annular portion.

[0009] Further, the second ratchet includes a bottom wall and a side wall, the second teeth are formed on the bottom wall, and the supporting portions are formed on the side wall.

[0010] Further, the bottom wall and the side wall enclose a receiving cavity, and when the first teeth are engaged with the second teeth, the first ratchet is located in the receiving cavity.

[0011] Further, the notch includes a bottom surface and two side surfaces connecting the bottom surface, the bottom surface is perpendicular to the output shaft, and the two side surfaces are parallel to the output shaft.

[0012] Further, the transmission mechanism is configured to transmit the power of the motor to the output shaft.

[0013] Further, the housing includes a function switching element, and the force-receiving portion is directly coupled to the function switching element and is configured to receive an operating force to drive the convex portion to rotate. When a user operates the function switching element, the force-receiving portion can be driven, thereby switching the operating function of the tool.

[0014] The transmission mechanism of the impact tool includes a first ratchet, a second ratchet and a function switching bracket. The first ratchet is coupled to the output shaft, the first ratchet and the second ratchet can be in tooth connection to transmit power, and the convex portion of the switching bracket abuts against the notch or the supporting portion of the second ratchet respectively to achieve different functions, providing a transmission mechanism of an electric tool and an electric tool with a simpler structure. Brief Description of the Drawings

[0015] Figure 1 is a perspective view of the transmission mechanism of the impact tool according to an embodiment of the present application.

[0016] Figure 2 is Figure 1 a perspective exploded view of the impact tool shown from another angle.

[0017] Figure 3 is Figure 1 a schematic cross-sectional view of the transmission mechanism of the impact tool shown. Detailed Description of the Embodiments

[0018] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application.

[0019] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings understood by those of ordinary skill in the field to which this utility model belongs. The "first", "second" and similar terms used in this application do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one. "Plurality" or "several" means two or more. Unless otherwise specified, the similar terms such as "front part", "rear part", "lower part" and / or "upper part" are for convenience of description only and are not limited to a position or a spatial orientation. The terms such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect. The singular forms of "a", "the" and "said" used in the specification and claims of this application are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0020] Combined with Figures 1 to 3 , a transmission mechanism of an impact tool, the impact tool includes an output shaft 1, the transmission mechanism includes a deceleration structure and an impact structure, the deceleration structure includes a power output end, the output shaft 1 is connected to the power output end, the impact structure includes a first ratchet 2, a second ratchet 3 and a function switching bracket 4, the first ratchet 2 is coupled to the output shaft 1, the first ratchet 2 includes a first tooth 21 facing the second ratchet, the second ratchet 3 includes a second tooth 31, a plurality of support portions 32 surrounding the second tooth and a notch 36 formed between adjacent support portions, the plurality of support portions 32 are arranged along the circumferential direction of the second tooth 31; the function switching bracket 4 includes an annular portion 41, a plurality of convex portions 42 and a force receiving portion 43, the plurality of convex portions 42 extend outward from the annular portion 41 and are arranged along the circumferential direction of the annular portion 41, the force receiving portion 43 is configured to receive an operating force so as to drive the function switching bracket 4 to rotate; the first ratchet 2 has a first position and a second position, when the first ratchet 2 is in the first position, the convex portion 42 is aligned with the support portion 32 and is supported by the support portion 32; when the first ratchet 2 is in the second position, the convex portion 42 is aligned with the notch 33, so that the convex portion 32 can enter the notch 33 to realize the engagement of the first tooth 21 and the second tooth 31.

[0021] The impact structure further includes an elastic member 5 and a bearing 6, and the first ratchet wheel 2 is biased by the elastic member 5 against the bearing 6.

[0022] Preferably, the number of the supporting portions 32 and the notches 33 is equal and not less than 5, providing greater supporting force, making the cooperation between the convex portions 42 and the notches 33 or the supporting portions 32 more stable and not easily deformed. The number of the convex portions 42 is equal to the number of the supporting portions 32, and the force-receiving portion 43 extends from one of the convex portions 42. Further, the force-receiving portion 43 is in a Z shape, and the force-receiving portion 43 and the annular portion 41 are integrally formed.

[0023] Combined Figure 2 and Figure 3 The second ratchet wheel 3 includes a bottom wall 34 and a side wall 35. The second teeth 31 are formed on the bottom wall 34, and the supporting portions 32 are formed on the side wall 35. The bottom wall 34 and the side wall 35 enclose a receiving cavity. When the first teeth 21 and the second teeth 31 are engaged, the first ratchet wheel 2 is located in the receiving cavity.

[0024] The notch 33 includes a bottom surface 36 and two side surfaces 37 connecting the bottom surface. The bottom surface 36 is perpendicular to the output shaft 1, and the two side surfaces 37 are parallel to the output shaft 1. The transmission mechanism is configured to transmit the power of the motor to the output shaft 1.

[0025] Preferably, the housing includes a function switching element, and the force-receiving portion 43 is directly coupled to the function switching element and is configured to receive an operating force to drive the convex portion to rotate. When the user operates the function switching element, the force-receiving portion can be driven, thereby switching the operating function of the tool.

[0026] The transmission mechanism of the impact tool includes a first ratchet wheel, a second ratchet wheel and a function switching bracket. The first ratchet wheel is coupled to the output shaft. The first ratchet wheel and the second ratchet wheel can be in tooth connection to transmit power. The convex portion of the switching bracket abuts against the notch or the supporting portion of the second ratchet wheel respectively to achieve different functions, providing a transmission mechanism of an electric tool and an electric tool with a simpler structure, more convenient assembly, improved user experience, more convenient operation and greatly improved work efficiency.

[0027] It should be understood that the drawings illustrate the exemplary embodiments in detail, and it should be understood that the present application is not limited to the details or methods described in the specification or illustrated in the drawings. It should also be understood that the terms are only for the purpose of description and should not be considered restrictive.

[0028] In view of this specification, further modifications and alternative embodiments of various aspects of the present invention will be apparent to those skilled in the art. Accordingly, the description should be construed as illustrative only. The configurations and arrangements shown in the various exemplary embodiments are illustrative only. Although only some embodiments have been described in detail in this disclosure, many modifications can be made (e.g., variations in the size, dimensions, structure, shape and proportions of various elements, values of parameters, mounting arrangements, use of materials, color, orientation, etc.) without materially departing from the novel teachings and advantages of the subject matter described herein. Some elements shown as integrally formed can be constructed of multiple parts or elements, the position of the elements can be reversed or otherwise changed, and the nature or number or position of discrete elements can be changed or varied. According to alternative embodiments, the order or sequence of any process, logical algorithm or method step can be changed or re-ordered. Other substitutions, modifications, changes and omissions can also be made to the design, operating conditions and arrangements of the various exemplary embodiments without departing from the scope of the present invention.

[0029] Although the present application recites a particular combination of features in the appended claims, various embodiments of the present invention relate to any combination of any of the features described herein, whether or not such combination is currently claimed, and any such combination of features can be claimed in this application or in a future application. Any feature, element or component in any of the exemplary embodiments discussed above can be used alone or in combination with any feature, element or component in any of the other exemplary embodiments discussed above.

[0030] In the various exemplary embodiments, relative dimensions including angles, lengths and radii, as shown in the drawings, are drawn to scale. The actual measurements of the drawings will disclose the relative dimensions, angles and proportions of the various exemplary embodiments. The various exemplary embodiments extend to various ranges of absolute and relative dimensions, angles and proportions that can be determined from the drawings. The various exemplary embodiments include any combination of one or more relative dimensions or angles that can be determined from the drawings. Additionally, actual dimensions not explicitly stated in this specification can be determined by using the scale of the dimensions measured in the drawings in combination with the explicit dimensions stated in this specification.

Claims

1. A transmission mechanism of an impact tool, the impact tool comprising an output shaft, the transmission mechanism comprising a reduction structure and an impact structure, the reduction structure comprising a power output end, the output shaft being connected to the power output end, characterized in that: The impact structure includes a first ratchet, a second ratchet and a function switching bracket, the first ratchet is coupled to the output shaft, the first ratchet includes a first tooth facing the second ratchet, the second ratchet includes a second tooth, a plurality of support portions surrounding the second tooth and a gap formed between adjacent support portions, and the plurality of support portions are arranged along the circumference of the second tooth; The function switching bracket includes an annular portion, a plurality of convex portions and a force-bearing portion, wherein the plurality of convex portions extend outward from the annular portion and are arranged along the circumference of the annular portion, and the force-bearing portion is configured to receive an operating force, thereby driving the function switching bracket to rotate; The first ratchet has a first position and a second position. When the first ratchet is in the first position, the protrusion is aligned with the support portion and supported by the support portion; when the first ratchet is in the second position, the protrusion is aligned with the notch, so that the protrusion can enter the notch to achieve meshing of the first tooth and the second tooth.

2. The transmission mechanism of the impact tool according to claim 1, characterized in that: The impact structure further includes an elastic member and a bearing, and the first ratchet is biased toward the bearing by the elastic member.

3. The transmission mechanism of the impact tool according to claim 1, characterized in that: The number of the supporting parts and the notches is equal and no less than 5.

4. The transmission mechanism of the impact tool according to claim 3, characterized in that: The number of the protrusions is equal to the number of the supporting parts, and the force-bearing part is formed by extending from one of the protrusions.

5. The transmission mechanism of the impact tool according to claim 1, characterized in that: The force-bearing portion is Z-shaped.

6. The transmission mechanism of the impact tool according to claim 1, characterized in that: The second ratchet includes a bottom wall and a side wall, the second teeth are formed on the bottom wall, and the support portion is formed on the side wall.

7. The transmission mechanism of the impact tool according to claim 6, characterized in that: The bottom wall and the side wall form a receiving cavity, and when the first tooth is meshed with the second tooth, the first ratchet is located in the receiving cavity.

8. The transmission mechanism of the impact tool according to claim 1, characterized in that: The notch comprises a bottom surface and two side surfaces connected to the bottom surface, the bottom surface is perpendicular to the output shaft, and the two side surfaces are parallel to the output shaft.

9. An impact tool, characterized in that: It comprises a casing, a motor arranged in the casing, an output shaft and a transmission structure as claimed in any one of claims 1 to 8, wherein the transmission mechanism is configured to transmit the power of the motor to the output shaft.

10. The impact tool according to claim 9, wherein: The housing includes a function switching element, and the force-bearing portion is directly coupled to the function switching element and is configured to receive an operating force to drive the convex portion to rotate.

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