power tools

Abstract

This utility model relates to an electric tool, comprising: a motor for outputting rotational driving force; and a housing including a rear end cover. The rear end cover includes a plastic cover body and a metal part integrally formed by insert injection molding. The metal part at least partially forms the rear end face of the rear end cover. The plastic cover body has a plurality of first through holes. At least a portion of the first through holes are axially opposite to the metal part of the motor, so that the heat generated by the motor can be dissipated sequentially through the first through holes and the metal part. This utility model's electric tool, by using insert injection molding to process the plastic cover body and the metal part into an integral rear end cover structure, can improve the impact life of the rear end cover. The plastic cover body and the metal part are less likely to undergo relative displacement due to impact operations. Furthermore, the first through holes in the plastic cover body facilitate faster heat dissipation from the motor.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a power tool. Background Technology

[0002] Power tools, including but not limited to electric drills, electric screwdrivers, and electric wrenches, are widely used. When using power tools, operators may need to strike workpieces, such as bolts or fasteners. Operators usually use the rear end face of the power tool housing to strike the workpiece. However, the housing of power tools is usually made of plastic. If the rear end face of the housing is used directly to strike the workpiece, it can easily lead to severe wear and even deformation of the rear end face of the housing, thus affecting the use of the power tool.

[0003] Some existing power tools use a metal striking plate added to the rear of the housing. The operator can use the metal striking plate to strike the workpiece. The metal striking plate is assembled with the housing by snap-fit ​​or screw fixation. As the number of strikes increases, the metal striking plate is prone to relative displacement, affecting the striking work. Moreover, the function of the metal striking plate is singular. Utility Model Content

[0004] Based on the aforementioned deficiencies in the existing technology, the purpose of this utility model is to provide an electric tool that uses insert injection molding to process the plastic cover and the metal part into an integral structure rear end cover, which can improve the hammering life of the rear end cover, and the plastic cover and the metal part are not easily displaced relative to each other due to hammering operations. Furthermore, a first through hole is provided on the plastic cover to facilitate faster heat dissipation of the motor.

[0005] Therefore, the present invention provides the following technical solution.

[0006] This utility model provides an electric tool, the electric tool comprising:

[0007] An electric motor is used to output rotational driving force;

[0008] The housing includes a rear end cover, which comprises a plastic cover body and a metal part integrally formed by insert injection molding. The metal part at least partially forms the rear end face of the rear end cover. The plastic cover body is provided with a plurality of first through holes. At least a portion of the first through holes are positioned opposite the metal part in the axial direction of the motor, so that the heat generated by the motor can be dissipated sequentially through the first through holes and the metal part.

[0009] Optionally, the plastic cover has an annular groove that surrounds the periphery of the metal part.

[0010] Optionally, the metal part is generally circular in shape, and all the first through holes are spaced apart along the circumference of the metal part.

[0011] Optionally, the first through hole is located near the peripheral surface wall of the metal part.

[0012] Optionally, the plastic cover has an annular groove that surrounds the periphery of the metal part;

[0013] The first through hole and the annular groove are at least partially opposite each other in the axial direction of the motor.

[0014] Optionally, the plastic cover has a slot on the side opposite to the metal part for mounting the rear bearing;

[0015] The motor includes a rotor shaft, the rear end of which is rotatably mounted in the slot via the rear bearing.

[0016] Optionally, the plastic cover is provided with an annular protrusion and multiple reinforcing ribs on the side away from the metal part, and the circumferential surface wall of the plastic cover extends in the direction away from the metal part to form an annular extension, and the groove is formed in the middle of the annular protrusion.

[0017] The two ends of the reinforcing rib are connected to the annular protrusion and the annular extension, respectively, and all the reinforcing ribs are distributed in a radial pattern.

[0018] Optionally, the motor further includes a rotor shaft and a fan sleeved on the rotor shaft; the maximum distance between the circumferential wall of the first through hole and the axis of the motor is D1, and the maximum distance between the circumferential wall of the fan and the axis of the motor is D2, where D1 > D2.

[0019] Optionally, the first through hole is a circular hole, and the distance between the center of the first through hole and the axis of the motor is D3, where D3 > D2.

[0020] Optionally, the power tool further includes a protective film that adheres to the exposed surface of the metal part, the protective film having a raised edge structure that extends to the outside of the housing;

[0021] And / or, the outer periphery of the metal part is provided with a positioning notch, which is used to engage with the positioning post of the insert injection mold;

[0022] And / or, the metal part is not perfectly circular, and the outer periphery of the metal part is provided with an indicator notch, which is used to indicate the placement position of the metal part during the insert injection molding process.

[0023] This utility model has the following technical effects:

[0024] This utility model provides an electric tool that uses insert injection molding to integrate a plastic cover and a metal part into a single rear end cover structure. During the molding process, the plastic cover shrinks and wraps around the metal part, resulting in a high-strength and wear-resistant rear end cover. Compared to existing technologies where the metal striking plate is fixed to the machine housing via snap-fit ​​or screws, this insert injection molding structure improves the striking life of the rear end cover. Furthermore, the plastic cover and metal part are less prone to relative displacement during striking operations, preventing interference with the striking function of the rear end cover. In addition, taking advantage of the superior heat dissipation performance of the metal part compared to the plastic cover, a first through-hole is formed in the plastic cover, and the positional relationship between the first through-hole and the metal part is defined, which facilitates faster heat dissipation from the motor. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the power tool of this utility model;

[0026] Figure 2 This is a cross-sectional view of the power tool of this utility model;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is an exploded view of the structure of the power tool according to this utility model;

[0029] Figure 5 This is a three-dimensional structural diagram of the plastic cover of this utility model;

[0030] Figure 6 This is a cross-sectional view of the plastic cover of this utility model.

[0031] Explanation of reference numerals in the attached figures

[0032] 100. Power tools;

[0033] 1. Motor; 11. Rotor shaft; 12. Fan;

[0034] 2. Housing;

[0035] 211. Plastic cover body; 2111. First through hole; 2112. Annular groove; 2113. Groove; 2114. Annular protrusion; 2115. Reinforcing rib; 2116. Annular extension; 2117. Cover body; 2118. Second through hole;

[0036] 212. Metal part; 2121. Locating notch; 2122. Indicating notch;

[0037] 3. Rear bearing;

[0038] 4. Protective film; 41. Curved edge structure. Detailed Implementation

[0039] To make the technical solution and beneficial effects of this utility model more apparent and understandable, a detailed description is provided below by listing specific embodiments. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0040] In the description of this utility model, unless otherwise expressly defined, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limitations on this utility model.

[0041] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two; "several" means at least one; unless otherwise expressly defined.

[0042] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] In this utility model, unless otherwise explicitly defined, the terms "above," "on top of," "above," "over," "below," "below," "below," or "below" for "first feature above second feature" can refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Furthermore, "above," "above," and "over" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0044] In this utility model, "front," "rear," "upper," and "lower" all refer to... Figure 1 The markings in the text shall prevail.

[0045] The following is based on Figures 1 to 6 This utility model describes the power tool in detail.

[0046] In this embodiment, such as Figures 1 to 4 As shown, the power tool 100 includes a motor 1 and a housing 2. The motor 1 is used to output rotational driving force. The housing 2 includes a rear end cover 21, which includes a plastic cover 211 and a metal part 212, which are integrally formed by insert injection molding. When the power tool 100 is in use, the metal part 212 at least partially forms the rear end face of the rear end cover 21. The structural strength of the metal part 212 is superior to that of the plastic cover 211. If the operation requires the power tool 100 to strike the workpiece, the operator can strike the workpiece through the metal part 212 to avoid directly striking the plastic cover 211 and causing deformation of the plastic cover 211. The plastic cover 211 has a plurality of first through holes 2111. The shape of the first through holes 2111 is not limited to regular or irregular shapes such as circles, squares, triangles, polygons, or irregular shapes. At least part of the first through hole 2111 and the metal part 212 are axially opposite each other in the motor 1. In this way, some of the heat generated by the motor 1 during operation will be directly conducted to the metal part 212 through the first through hole 2111. That is, the heat generated by the motor 1 can be dissipated in sequence through the first through hole 2111 and the metal part 212.

[0047] The above technical solution employs insert injection molding to integrate the plastic cover 211 and the metal part 212 into a single structure. During the molding process, the plastic cover 211 shrinks and wraps around the metal part 212, resulting in a high-strength and wear-resistant rear cover 21. Compared to existing solutions where the metal striking plate is fixed to the housing via snap-fit ​​or screws, this integrated insert injection molding structure improves the striking life of the rear cover 21. Furthermore, the plastic cover 211 and the metal part 212 are less prone to relative displacement during striking operations, preventing any impact on the striking performance of the rear cover 21. Additionally, taking advantage of the superior heat dissipation performance of the metal part 212 compared to the plastic cover 211, a first through hole 2111 is created in the plastic cover 211, and the positional relationship between the first through hole 2111 and the metal part 212 is defined, which facilitates faster heat dissipation from the motor 1.

[0048] It should be understood that during the use of power tool 100, in order to ensure the normal operation of motor 1, overheat protection of motor 1 is required. The setting of the first through hole 2111 in the above solution can utilize natural heat dissipation to accelerate the heat dissipation speed of motor 1. Of course, in order to accelerate the heat dissipation effect of motor 1, motor 1 will be equipped with fan 12. Fan 12 rotates to accelerate the airflow around motor 1, thereby accelerating heat dissipation through air cooling.

[0049] In one implementation, such as Figure 3 and Figure 6 As shown, the plastic cover 211 has an annular groove 2112, which wraps around the periphery of the metal part 212, thereby enhancing the wrapping of the plastic cover 211 around the metal part 212 and improving the structural strength of the rear cover 21.

[0050] Furthermore, such as Figure 3 and Figure 6 As shown, the plastic cover 211 includes a cover body 2117, and an annular groove 2112 is located on the rear side of the cover body 2117. The annular groove 2112 is integrally formed on the peripheral side wall of the cover body 2117. In this way, the peripheral side of the metal part 212 is wrapped by the annular groove 2112, and the rear surface wall of the metal part 212 abuts against the cover body 2117 to improve the stability of the connection between the plastic cover 211 and the metal part 212.

[0051] In one implementation, such as Figure 4 and Figure 5 As shown, the metal part 212 is roughly circular in shape, and all the first through holes 2111 are spaced apart along the circumference of the metal part 212. In this way, when the heat generated by the motor 1 is transmitted to the metal part 212 through the first through holes 2111, it is beneficial to the metal part 212 to be heated evenly, thereby increasing the speed at which the metal part 212 conducts heat to the outside air, that is, it is beneficial to accelerate the heat conduction of the metal part 212.

[0052] Furthermore, such as Figure 3 and Figure 4 As shown, the first through hole 2111 is located close to the peripheral surface wall of the metal part 212. Specifically, the heat generated by the motor 1 is concentrated on the outer periphery of the motor 1. The peripheral surface wall of the metal part 212 is close to the outer periphery of the motor 1. By optimizing the setting position of the first through hole 2111, it is beneficial to accelerate the conduction of heat from the outer periphery of the motor 1 through the first through hole 2111 and the metal part 212.

[0053] Furthermore, such as Figure 3 and Figure 4 As shown, since the annular groove 2112 wraps around the periphery of the metal part 212, the first through hole 2111 and the annular groove 2112 are positioned at least partially opposite each other in the axial direction of the motor 1. Specifically, the first plane is set to be perpendicular to the central axis of the motor 1, the projection of the first through hole 2111 on the first plane is the first projection, and the projection of the annular groove 2112 on the first plane is the second projection. The first projection and the second projection at least partially overlap, so that the first through hole 2111 is set close to the periphery of the metal part 212.

[0054] Furthermore, such as Figure 3 and Figure 4 As shown, by limiting the radial dimension of the first through hole 2111 in the motor 1, the first projection and the second projection only partially overlap. Furthermore, the part of the first projection that does not overlap with the second projection is located on the side of the second projection facing the central axis of the motor 1. In this way, while ensuring that the first through hole 2111 is located close to the peripheral surface wall of the metal part 212, it also ensures that some of the heat conducted to the metal part 212 through the first through hole 2111 is not blocked by the groove wall of the annular groove 2112, which is conducive to the rapid conduction of heat on the metal part 212 to the outside air.

[0055] In one implementation, such as Figures 3 to 6 As shown, the plastic cover 211 has a slot 2113 on the side opposite to the metal part 212, which is used to install the rear bearing 3. The motor 1 includes a rotor shaft 11, and the rear end of the rotor shaft 11 is rotatably mounted in the slot 2113 via the rear bearing 3. The plastic cover 211 also supports the rotor shaft 11. Furthermore, the slot 2113 is located at the center of the plastic cover 211, which is beneficial for the balanced force on the plastic cover 211. Furthermore, the first through hole 2111 is located close to the peripheral surface wall of the metal part 212, which is beneficial for accelerating heat dissipation. At the same time, it can also increase the distance between the first through hole 2111 and the slot 2113, avoiding the first through hole 2111 and the slot 2113 being too close together, which would affect the structural strength of the slot 2113.

[0056] Furthermore, such as Figure 3 , Figure 5 and Figure 6 As shown, the plastic cover 211, on the side facing away from the metal part 212, is also provided with an annular protrusion 2114 and multiple reinforcing ribs 2115. The circumferential surface wall of the plastic cover 211 extends in the direction facing away from the metal part 212 to form an annular extension 2116, and a groove 2113 is formed in the middle of the annular protrusion 2114. The two ends of the reinforcing ribs 2115 are connected to the annular protrusion 2114 and the annular extension 2116, respectively. All the reinforcing ribs 2115 are distributed radially to reinforce the groove 2113, so as to stably support the rotor shaft 11. The annular extension 2116 can be a complete annulus or an open annulus.

[0057] In one implementation, such as Figure 3 As shown, the motor 1 also includes a fan 12, which is sleeved on the rotor shaft 11 to accelerate heat dissipation of the motor 1. The maximum distance between the circumferential wall of the first through hole 2111 and the axis of the motor 1 is D1, and the maximum distance between the circumferential wall of the fan 12 and the axis of the motor 1 is D2, where D1 > D2. Specifically, during the rotation of the fan 12, most of the hot airflow flows towards the front of the power tool 100, and some of the hot airflow flows radially along the fan 12. By limiting the relationship between D1 and D2, it is beneficial for the hot airflow flowing radially along the fan 12 to dissipate heat through the natural heat dissipation path formed by the first through hole 2111 and the metal part 212.

[0058] Furthermore, such as Figure 3 As shown, the first through hole 2111 is a circular hole, and the distance between the center of the first through hole 2111 and the axis of the motor 1 is D3, D3>D2, so as to further facilitate the heat dissipation of the hot airflow flowing radially along the fan 12 through the natural heat dissipation path formed by the first through hole 2111 and the metal part 212.

[0059] In one implementation, such as Figures 1 to 4 As shown, the power tool 100 also includes a protective film 4, which is attached to the exposed surface of the metal part 212. Before the power tool 100 is used for the first time, the protective film 4 protects the metal part 212 from scratches during storage or transportation, thus affecting the consumer's purchasing experience. In addition, the protective film 4 has a pry-off structure 41 that extends to the outside of the housing 2. When using the power tool 100 for the first time, the user can easily peel off the protective film 4 by grasping the pry-off structure 41, so that the metal part 212 at least partially forms the rear end face of the rear end cover 21 for tapping.

[0060] In one implementation, such as Figure 3 and Figure 4As shown, the outer periphery of the metal part 212 is provided with a positioning notch 2121, which is used to engage with the positioning post of the insert injection mold to restrict the movement of the metal part 212. If the positioning post of the insert injection mold is long, a second through hole 2118 will be formed on the plastic cover 211.

[0061] In one implementation, such as Figure 4 As shown, the metal part 212 is not perfectly circular, and an indicator notch 2122 is provided on the outer periphery of the metal part 212. The indicator notch 2122 is used to indicate the placement position of the metal part 212 during the insert injection molding process, thus playing a foolproof role. Of course, the positioning notch 2121 and the indicator notch 2122 have different shapes or sizes to distinguish their respective uses. For example, the positioning notch 2121 is non-circular, while the indicator notch 2122 is circular.

[0062] It should be understood that in this article, "front" means the direction in which the power tool 100 is facing the workpiece (such as a wooden board or wall) during operation, and "back" means the opposite direction to "front".

[0063] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this utility model that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this utility model and do not limit the scope of protection of this utility model patent.

Claims

1. A power tool characterized by comprising: The power tool includes: An electric motor is used to output rotational driving force; The housing includes a rear end cover, which comprises a plastic cover body and a metal part integrally formed by insert injection molding. The metal part at least partially forms the rear end face of the rear end cover. The plastic cover body is provided with a plurality of first through holes. At least a portion of the first through holes are positioned opposite the metal part in the axial direction of the motor, so that the heat generated by the motor can be dissipated sequentially through the first through holes and the metal part.

2. The power tool of claim 1, wherein, The plastic cover has an annular groove that surrounds the periphery of the metal part.

3. The power tool of claim 1, wherein, The metal part is generally circular in shape, and all the first through holes are spaced apart along the circumference of the metal part.

4. The power tool of claim 3, wherein, The first through hole is located near the peripheral surface wall of the metal part.

5. The power tool of claim 4, wherein, The plastic cover has an annular groove that surrounds the periphery of the metal part; The first through hole and the annular groove are at least partially opposite each other in the axial direction of the motor.

6. The power tool of any of claims 1-5, wherein, The plastic cover has a slot on the side opposite to the metal part, and the slot is used to install the rear bearing; The motor includes a rotor shaft, the rear end of which is rotatably mounted in the slot via the rear bearing.

7. The power tool of claim 6, wherein, The plastic cover is provided with an annular protrusion and multiple reinforcing ribs on the side away from the metal part. The circumferential surface wall of the plastic cover extends in the direction away from the metal part to form an annular extension. The groove is formed in the middle of the annular protrusion. The two ends of the reinforcing rib are connected to the annular protrusion and the annular extension, respectively, and all the reinforcing ribs are distributed in a radial pattern.

8. The power tool of any of claims 1-5, wherein, The motor also includes a rotor shaft and a fan sleeved on the rotor shaft; the maximum distance between the circumferential wall of the first through hole and the axis of the motor is D1, and the maximum distance between the circumferential wall of the fan and the axis of the motor is D2, where D1 > D2.

9. The power tool of claim 8, wherein, The first through hole is a circular hole, and the distance between the center of the first through hole and the axis of the motor is D3, where D3 > D2.

10. The power tool of any of claims 1-5, wherein, The power tool also includes a protective film that adheres to the exposed surface of the metal part, the protective film having a raised edge structure that extends to the outside of the housing; And / or, the outer periphery of the metal part is provided with a positioning notch, which is used to engage with the positioning post of the insert injection mold; And / or, the metal part is not perfectly circular, and the outer periphery of the metal part is provided with an indicator notch, which is used to indicate the placement position of the metal part during the insert injection molding process.

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