Electric tool and motor

Abstract

The utility model discloses an electric tool and a motor. The electric tool comprises a working accessory, a shell and a motor contained in the shell, the motor comprises a stator assembly and a rotor assembly, and the stator assembly is arranged on the periphery of the rotor assembly; the shell comprises at least one first limiting part, and the stator assembly comprises at least one second limiting part. The electric tool further comprises a first fixing piece, and the first fixing piece is matched with the first limiting part and the second limiting part so that the stator assembly can be fixed in the shell. The interference fit between the stator assembly and the shell is realized by utilizing the characteristics of the corresponding limiting parts on the shell and the stator assembly and pressing the first fixing piece. By adopting the mode, the interference fit between the metal shell and the stator assembly can be realized, the stable installation of the stator assembly is ensured, the positioning reliability of the stator assembly is improved, and the service life of the whole machine is prolonged.

Description

Technical Field

[0001] The present application relates to an electric tool, and more particularly to an electric tool and a motor. Background Art

[0002] Impact tools are widely favored by users as a handheld power tool for outputting torque. Impact tools can be equipped with different working accessories, and these different working accessories enable the impact tools to be, for example, impact drills, impact screwdrivers, etc. When the impact tool is working, the motor is used as a power unit to provide power for the impact tool. The motor includes a stator and a rotor arranged in the stator.

[0003] One impact tool in the related art uses a plastic casing to fix the stator of the motor, and the plastic casing and the stator are interference-fitted. However, the plastic casing has problems such as being too large in size and having a short lifespan. In order to reduce the size of the entire machine and extend the life of the motor, the casing uses a metal casing with better strength. However, the metal casing and the stator can only be matched with a small gap, and the stator and the casing cannot be fixed stably, resulting in early failure of the stator.

[0004] This section provides background information related to the present application which is not necessarily prior art. Utility Model Content

[0005] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide an electric tool and a motor.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] An electric tool, comprising:

[0008] Working accessories, capable of being driven for working;

[0009] shell;

[0010] A motor, contained in the housing, comprising a stator assembly and a rotor assembly, wherein the stator assembly is disposed on the periphery of the rotor assembly;

[0011] The housing includes at least one first limiting portion, and the stator assembly includes at least one second limiting portion;

[0012] The electric tool further includes a first fixing member, which cooperates with the first limiting portion and the second limiting portion to fix the stator assembly in the housing.

[0013] In some embodiments, the first limiting portion is a first limiting notch or a first limiting protrusion, and the second limiting portion is a second limiting notch or a second limiting protrusion.

[0014] In some embodiments, when the first limiting portion is the first limiting slot and the second limiting portion is the second limiting slot, the first fixing member includes a first fixing protrusion and a second fixing protrusion extending in a radial direction, the second fixing protrusion is opposite to the first fixing protrusion, the first fixing protrusion cooperates with the first limiting slot, and the second fixing protrusion cooperates with the second limiting slot.

[0015] In some embodiments, the electric tool further includes a second fixing member, and the housing further includes an axial connecting hole, wherein the axial connecting hole cooperates with the second fixing member to axially fix the stator assembly.

[0016] In some embodiments, the electric tool further includes an axial limiting portion extending in a radial direction to a surface of the stator assembly, and the axial limiting portion is disposed between the second fixing member and the axial connecting hole.

[0017] In some embodiments, the second fixing member is a screw.

[0018] In some embodiments, the first fixing member cooperates with the first limiting portion and the second limiting portion to radially fix the stator assembly in the housing.

[0019] In some embodiments, the housing is a metal housing.

[0020] In some embodiments, the housing is a plastic housing.

[0021] A motor, comprising:

[0022] shell;

[0023] A stator assembly and a rotor assembly, wherein the stator assembly is arranged on the periphery of the rotor assembly;

[0024] The housing includes at least one first limiting portion, and the stator assembly includes at least one second limiting portion;

[0025] The motor further includes a first fixing member, which cooperates with the first limiting portion and the second limiting portion to fix the stator assembly in the housing.

[0026] The benefits of this application are:

[0027] The present application provides an electric tool, comprising a housing and a motor contained in the housing, wherein the motor comprises a stator assembly and a rotor assembly, wherein the stator assembly is arranged on the periphery of the rotor assembly; the housing comprises at least one first limiting portion, and the stator assembly comprises at least one second limiting portion. The electric tool also comprises a first fixing member, which cooperates with the first limiting portion and the second limiting portion so that the stator assembly is fixed in the housing. By utilizing the corresponding limiting portion features on the housing and the stator assembly, and by press-fitting the first fixing member, an interference fit between the stator assembly and the housing is achieved. In this way, an interference fit between the metal housing and the stator assembly can be achieved, which not only ensures the stable installation of the stator assembly, improves the positioning reliability of the stator assembly, but also prolongs the life of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the impact wrench provided by the present application;

[0029] Figure 2 It is a schematic diagram of the principle of the impact wrench provided by the present application;

[0030] Figure 3 is a schematic diagram of the structure of the motor involved in this application;

[0031] Figure 4 yes Figure 3 A schematic diagram of the structure of the motor housing involved in the invention;

[0032] Figure 5 yes Figure 4 A partial enlarged view of the housing and stator assembly involved;

[0033] Figure 6 is a structural schematic diagram of the first fixing member involved in this application;

[0034] Figure 7 It is a structural schematic diagram of the housing, stator assembly, first fixing member and second fixing member involved in this application;

[0035] Figure 8 yes Figure 7 A partial enlarged view of the middle A;

[0036] Fig. 9 It is a schematic structural diagram of the housing, stator assembly and first fixing member involved in this application.

[0037] In the figure:

[0038] 100, impact wrench; 101, first axis; 102, second axis;

[0039] 10. housing; 11. gripping portion; 12. first limiting portion; 13. axial connecting hole;

[0040] 20. Motor; 21. Stator assembly; 211. Second limiting portion; 22. Rotor assembly; 221. Rotating shaft; 23. Fan;

[0041] 30. first fixing member; 31. first fixing protrusion; 32. second fixing protrusion;

[0042] 40. A second fixing member;

[0043] 50. Axial limiting portion;

[0044] 60. Transmission mechanism;

[0045] 70. Impact mechanism;

[0046] 80. output mechanism; 81. output shaft; 82. clamping assembly;

[0047] 90. Battery pack. DETAILED DESCRIPTION

[0048] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0049] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0050] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0051] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0052] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0053] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0054] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0055] The present application provides an electric tool, which can be a rotary impact tool, such as an impact screwdriver or an impact wrench 100, or a rotary electric tool, such as an electric drill, a power tool, etc. It can also be other decoration tools, such as an electric hammer, a nail gun, etc. Alternatively, it can also be a sawing tool, such as a reciprocating saw, a jigsaw, etc. Alternatively, it can also be other cutting tools, such as an electric milling machine, etc. Alternatively, it can also be a grinding tool, such as an angle grinder, a sander, etc. The present application does not limit the type of electric tool. As long as the electric tool can adopt the substantive content of the technical solution disclosed below, it can fall within the protection scope of the present application.

[0056] like Figure 1 and Figure 2As shown, in this embodiment, the electric tool is an impact wrench 100. The impact wrench 100 includes a housing 10, a motor 20, a transmission mechanism 60, an impact mechanism 70, and an output mechanism 80. The motor 20, the transmission mechanism 60, the impact mechanism 70, and the output mechanism 80 are sequentially arranged in the housing 10 along the axial direction of the housing 10.

[0057] The motor 20 is used to provide power to the output mechanism 80. The motor 20 includes a motor shaft that rotates with the first axis 101 as the axis. The output mechanism 80 includes an output shaft 81 for connecting a working accessory and driving the working accessory to rotate. A clamping assembly 82 is provided at the front end of the output shaft 81, which can clamp the corresponding working accessories, such as a screwdriver, a drill bit, a wrench, etc., when realizing different functions. The output shaft 81 is connected to the motor shaft and can be driven by the motor shaft to output power, so that the motor 20 drives the output shaft 81 to rotate through the motor shaft to drive the working accessory to rotate. The output shaft 81 rotates with the second axis 102 as the axis. In this embodiment, the first axis 101 coincides with the second axis 102. In other alternative embodiments, the second axis 102 is set at a certain angle to the first axis 101. In other alternative embodiments, the first axis 101 and the second axis 102 are parallel to each other but do not coincide.

[0058] The impact mechanism 70 is used to provide an impact force to the output shaft 81. The transmission mechanism 60 is disposed between the motor 20 and the impact mechanism 70. In this embodiment, the transmission mechanism 60 uses a planetary gear reduction. Because the working principle of the planetary gear reduction and the reduction generated by the transmission mechanism 60 are already fully disclosed to professionals in the field, they will not be described in detail.

[0059] The housing 10 is formed with or connected to a grip portion 11 for user operation, which is convenient for the user to hold and operate. One end of the grip portion 11 is connected to a power supply mechanism, which is used to provide electrical energy to the power tool. In the present embodiment, the power tool is powered by a DC power supply, and more specifically, the power supply mechanism is a battery pack 90. ​​The battery pack 90 cooperates with the corresponding power supply circuit to power the electrical components in the impact tool. The battery pack 90 is detachably connected to the grip portion 11. It can be understood that the power supply is not limited to the scenario of using the battery pack 90, and can also be powered by AC power, AC power, or a mixture of AC power and battery pack 90, in conjunction with the corresponding rectification, filtering and voltage regulation circuits, to achieve power supply to the electrical components in the power tool.

[0060] Specifically, Figure 3As shown, the motor 20 includes a stator assembly 21 and a rotor assembly 22, wherein the stator assembly 21 is arranged on the periphery of the rotor assembly 22, and the rotor assembly 22 includes a rotating shaft 221, which rotates integrally with the rotor assembly 22, and the rotating shaft 221 is connected to the output shaft 81. The rotational driving force of the rotor assembly 22 is transmitted to the output shaft 81 via the rotating shaft 221. A fan 23 is connected to the end of the rotating shaft 221 opposite to the driving output shaft 81, and the rotational driving force of the motor 20 is transmitted to the fan 23 via the rotating shaft 221. The fan 23 is provided to cool various parts in the housing 10 including the motor 20. The fan 23 rotates, generating airflow in the housing 10. The airflow cools the inside of the housing 10. The rotating shaft 221 is the above-mentioned motor shaft.

[0061] like Figures 4 to 9 As shown, the housing 10 includes at least one first limiting portion 12, and the stator assembly 21 includes at least one second limiting portion 211. The electric tool also includes a first fixing member 30, which cooperates with the first limiting portion 12 and the second limiting portion 211 to fix the stator assembly 21 in the housing 10. Specifically, the first fixing member 30 cooperates with the first limiting portion 12 and the second limiting portion 211 to radially fix the stator assembly 21 in the housing 10. By utilizing the corresponding limiting portion features on the housing 10 and the stator assembly 21, and by press-fitting the first fixing member 30, an interference fit between the stator assembly 21 and the housing 10 is achieved.

[0062] In this embodiment, the housing 10 is a metal housing. The metal housing and the stator assembly 21 cannot be press-fitted with interference, and there is a small gap between the stator assembly 21 and the casing, which makes the stator assembly 21 unstable. By adopting the above structure, the stator assembly 21 and the metal housing can be interference-fitted, which ensures the stable installation of the stator assembly 21, improves the positioning reliability of the stator assembly 21, and prolongs the life of the whole machine. In other alternative embodiments, the housing 10 can also be a plastic housing, and the plastic housing and the stator assembly 21 can also be interference-connected in the above manner. In addition, the motor 20 is directly set in the housing 10, and there is no need to set a separate shell for the motor 20 and then install it in the housing 10, so that the overall size of the impact wrench 100 can be reduced.

[0063] In some embodiments, reference Figure 4 and Figure 5 , the first limiting portion 12 is a first limiting notch, and the second limiting portion 211 is a second limiting notch; refer to Figure 6 The first fixing member 30 includes a first fixing protrusion 31 and a second fixing protrusion 32 extending in the radial direction, and the second fixing protrusion 32 is opposite to the first fixing protrusion 31; Figure 7 and Figure 8The first fixing protrusion 31 matches with the first limiting notch, and the second fixing protrusion 32 matches with the second limiting notch.

[0064] In some embodiments, the first limiting portion 12 is a first limiting protrusion, and the second limiting portion 211 is a second limiting protrusion; the first fixing member 30 includes a first fixing groove and a second fixing groove recessed in a radial direction, the second fixing groove is opposite to the first fixing groove, the first fixing groove cooperates with the first limiting protrusion, and the second fixing groove cooperates with the second limiting protrusion.

[0065] In some embodiments, one of the first limiting portion 12 and the second limiting portion 211 is a limiting slot, and the other is a limiting protrusion; the first fixing member 30 includes a fixing protrusion extending in the radial direction and a fixing groove recessed in the radial direction, the fixing protrusion is opposite to the fixing groove, the fixing protrusion cooperates with the limiting slot, and the fixing groove cooperates with the limiting protrusion.

[0066] Continue to refer to Figure 7 , and combined with Figure 4 The electric tool further includes a second fixing member 40, and the housing 10 further includes an axial connection hole 13, the axial connection hole 13 cooperates with the second fixing member 40 to axially fix the stator assembly 21. Further, continue to refer to Figure 7 , and combined with Fig. 9 The electric tool further includes an axial limiting portion 50 extending in the radial direction to the surface of the stator assembly 21, and the axial limiting portion 50 is disposed between the second fixing member 40 and the axial connection hole 13. Specifically, the second fixing member 40 includes a connecting portion and a limiting portion, the connecting portion of the second fixing member 40 is connected to the axial connection hole 13, the limiting portion of the second fixing member 40 is located outside the axial connection hole 13, and the axial limiting portion 50 is located between the limiting portion of the second fixing member 40 and the axial connection hole 13. In some embodiments, the second fixing member 40 is a screw, the axial connection hole 13 is a threaded hole, and the threaded portion of the screw is threadedly connected to the threaded hole. The axial limiting portion 50 is located between the head of the screw and the threaded hole.

[0067] The present application also provides a motor 20, including a housing 10, a stator assembly 21 and a rotor assembly 22, wherein the stator assembly 21 is arranged in the housing 10, and the rotor assembly 22 is arranged inside the stator assembly 21; the housing 10 includes at least one first limiting portion 12, and the stator assembly 21 includes at least one second limiting portion 211. The motor 20 also includes a first fixing member 30, which cooperates with the first limiting portion 12 and the second limiting portion 211 to fix the stator assembly 21 in the housing 10. The difference between the motor 20 here and the motor 20 in the above-mentioned power tool is that the housing 10 is the shell of the motor 20 itself, while the housing 10 in the above-mentioned power tool is the shell of the power tool. In addition, the remaining structures are the same as those described above and will not be repeated here.

[0068] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. An electric tool, comprising: Working accessories, capable of being driven for working; Housing (10); A motor (20) is housed in the housing (10), the motor (20) comprising a stator assembly (21) and a rotor assembly (22), the stator assembly (21) being arranged on the periphery of the rotor assembly (22); It is characterized in that The housing (10) comprises at least one first limiting portion (12), and the stator assembly (21) comprises at least one second limiting portion (211); The electric tool further comprises a first fixing member (30), wherein the first fixing member (30) cooperates with the first limiting portion (12) and the second limiting portion (211) so that the stator assembly (21) is fixed in the housing (10).

2. The electric tool according to claim 1, characterized in that: The first limiting portion (12) is a first limiting notch or a first limiting protrusion, and the second limiting portion (211) is a second limiting notch or a second limiting protrusion.

3. The electric tool according to claim 2, characterized in that: When the first limiting portion (12) is the first limiting slot and the second limiting portion (211) is the second limiting slot, the first fixing member (30) includes a first fixing protrusion (31) and a second fixing protrusion (32) extending in a radial direction, the second fixing protrusion (32) is opposite to the first fixing protrusion (31), the first fixing protrusion (31) cooperates with the first limiting slot, and the second fixing protrusion (32) cooperates with the second limiting slot.

4. The electric tool according to any one of claims 1 to 3, characterized in that: The electric tool further comprises a second fixing member (40), and the housing (10) further comprises an axial connection hole (13), wherein the axial connection hole (13) cooperates with the second fixing member (40) and is used to axially fix the stator assembly (21).

5. The electric tool according to claim 4, characterized in that: The electric tool further comprises an axial limiting portion (50) extending in a radial direction to the surface of the stator assembly (21), wherein the axial limiting portion (50) is arranged between the second fixing member (40) and the axial connecting hole (13).

6. The electric tool according to claim 4, characterized in that: The second fixing member (40) is a screw.

7. The electric tool according to claim 1, characterized in that: The first fixing member (30) cooperates with the first limiting portion (12) and the second limiting portion (211) to radially fix the stator assembly (21) in the housing (10).

8. The electric tool according to claim 1, characterized in that: The housing (10) is a metal housing.

9. The electric tool according to claim 1, characterized in that: The housing (10) is a plastic housing.

10. A motor, comprising: Housing (10); A stator assembly (21) and a rotor assembly (22), wherein the stator assembly (21) is arranged on the periphery of the rotor assembly (22); It is characterized in that The housing (10) comprises at least one first limiting portion (12), and the stator assembly (21) comprises at least one second limiting portion (211); The motor (20) further comprises a first fixing member (30), wherein the first fixing member (30) cooperates with the first limiting portion (12) and the second limiting portion (211) so that the stator assembly (21) is fixed in the housing (10).

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