Power tool

Abstract

The application discloses an electric tool, which comprises a casing, a control board accommodated in the casing, and a switch element arranged on the front surface of the control board. A supporting part is arranged in the casing and used for directly supporting the control board. A fixing element and a heat dissipation element are also accommodated in the casing. The heat dissipation element is fixed on the back surface of the control board through the fixing element and closely adheres to the area where the switch element is arranged.

Description

Technical Field

[0001] This application relates to the field of power tools, and more particularly to power tools with control panels. Background Technology

[0002] Most power tools on the market are equipped with a control circuit board, which is housed in a metal casing within the tool. This control circuit board contains multiple electronic components, such as MOSFETs, MCU chips, and resistors. These components generate a significant amount of heat during operation. To prevent the control circuit board from burning out, a heat dissipation structure is needed. The most common heat dissipation structure is a heat sink placed between the metal casing and the control circuit board. The heat generated by the electronic components is transferred away through the heat sink and the metal casing. However, this heat dissipation mechanism has several problems. First, for most handheld tools, the metal casing is located at the foot of the handle. Since the metal casing is relatively large, a large space is needed below the handle to house it, making the tool appear bulky. Second, the cost of the metal casing is high. Third, the heat generated by the electronic components remains inside the metal casing and cannot be completely dissipated, resulting in poor heat dissipation. Summary of the Invention

[0003] One object of the present invention is to provide a power tool that can reduce the overall size of the tool, achieve better heat dissipation, and reduce costs.

[0004] The present invention provides an electric tool, comprising: a housing; a control board housed within the housing, wherein a switch element is provided on the front side of the control board; a support portion is provided within the housing for directly supporting the control board; the housing also houses a fixing element and a heat dissipation element, wherein the heat dissipation element is fixed to the back side of the control board by the fixing element and is in close contact with the area where the switch element is located.

[0005] A further improvement is that the support includes at least one guide groove, which is located on the inner wall of the housing and is used to support the control board.

[0006] A further improvement is as follows: the support portion includes a first guide groove and a second guide groove, which are disposed on the front and rear sides of the housing.

[0007] A further improvement is that the first guide groove and the second guide groove have a height difference in the vertical direction, so that the control board can be tilted and supported inside the housing.

[0008] A further improvement is that the fixing element is located on the front of the control panel, and there is one and only one fixing element.

[0009] A further improvement is that the switching element is a MOSFET arranged on the control board.

[0010] A further improvement is as follows: the heat dissipation element is a heat sink, and the projection of the heat sink in the direction perpendicular to the control board completely covers the switching element.

[0011] A further improvement is that the fixing element is a screw, and the heat sink is connected to the control board by only one screw.

[0012] A further improvement is that the screw passes downwards from the front of the control board and is connected to the center of the heat sink.

[0013] A further improvement is as follows: the lower end of the housing is provided with a battery connection part, which includes a terminal assembly and a push-button.

[0014] Compared with the prior art, the beneficial effects of this application are as follows: First, the control board is directly housed in the tool housing without the need for other components, which can reduce the overall size of the tool; Second, the heat dissipation element is fixed to the control board by only one fixing element, which is simple and effective; Third, the heat generated by the control board is directly transferred out through the heat sink, resulting in better heat dissipation; Fourth, there is no need to arrange a separate metal housing for housing the control board inside the main housing, the number of fixing elements is reduced, and the cost can be reduced. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a power tool according to an embodiment of this application; Figure 2 This is a partial structural cross-sectional view of a power tool according to an embodiment of this application; Figure 3 This is a schematic diagram of the heat dissipation structure of a power tool according to an embodiment of this application; Meaning of the reference numerals in the diagram: Detailed Implementation

[0016] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0017] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0018] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0019] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0020] Reference Figures 1 to 3 In this embodiment, the power tool is preferably an impact wrench. The impact wrench includes a housing 1, within which a motor 2, a transmission mechanism 3, and an output shaft 4 are disposed. The transmission mechanism 3 is located between the motor 2 and the output shaft 4, and is driven by the motor 2. The output shaft 4 is connected to the front end of the transmission mechanism 3, so that the motor 2 drives the output shaft 4 through the transmission mechanism 3.

[0021] The housing 1 has a longitudinally elongated main body 11, a gripping part 12 connected to the lower end of the main body 11, and a foot plate part 13 located below the gripping part 12. The main body 11 has a receiving cavity (not shown in the figure). The motor 2, the transmission mechanism 3 and the output shaft 4 are housed in the receiving cavity, and the output shaft 4 extends axially out of the main body 11. The output shaft 4 is partially exposed at the front end of the housing 1. In this embodiment, the output shaft 4 is a wrench head that is at least partially exposed at the front end of the main body 11.

[0022] The upper end of the grip 12 is fixedly connected to the main body 11, and the lower end is connected to the foot plate 13. The grip 12 is for the user to hold and has an operation switch 15 located below the main body 11. The operation switch 15 is used by the operator to control the start and stop of the motor 2. The foot plate 13 has a control board 16, which is electrically connected to the operation switch 15 and the motor 2. The control board 16 is used to receive signals from the operation switch 15 and the motor 2. The foot plate 13 has a battery pack connection part 14 below it. The battery pack connection part 14 includes a terminal assembly 141 and a push knob 142. The battery pack connection part 14 is used to insert a battery pack to supply power to the impact wrench.

[0023] Furthermore, the inner wall of the foot plate portion 13 is provided with a support portion for supporting the control plate 16. The support portion includes a first guide groove 131 and a second guide groove 132. The first guide groove 131 and the second guide groove 132 are disposed on the front and rear sides of the foot plate portion 13, and there is a height difference between the first guide groove 131 and the second guide groove 132 in the vertical direction, so that the control plate 16 can be directly tilted and supported in the foot plate portion 13.

[0024] The control board 16 has a plurality of switching elements 161 and a circular hole on its front side. The switching elements 161 are MOS transistors arranged on the control board 16. The circular hole penetrates the entire control board 16. A heat dissipation element is attached to the back side of the control board 16. The heat dissipation element is a heat sink 17. The heat sink 17 and the control board 16 are connected by a fixing element 18, which is located on the front side of the control board 16.

[0025] In this embodiment, the fixing element 18 is a screw, and there is only one screw. The screw passes through the circular hole from the front of the control board 16 downwards and is connected to the center of the heat sink 17. The projection of the heat sink 17 in the direction perpendicular to the control board 16 completely covers the switching element 161.

[0026] Furthermore, the switching element 161 generates a large amount of heat during operation. The heat sink 17 is tightly attached to the area where the switching element 161 is located through the fixing element 18, thereby transferring the heat generated by the switching element 161 away and preventing the control board 16 from being burned out due to excessive temperature.

[0027] According to the solution of this application, the control board is directly supported in the machine housing through the guide groove on the inner wall of the foot plate, eliminating the need for a separate housing to house the control board, thus reducing the overall size of the tool and lowering the cost. At the same time, the heat dissipation element is fixed to the control board by only one fixing element, which is simple and effective, and the heat of the control board is directly transferred out through the heat sink, resulting in good heat dissipation.

[0028] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. An electric tool, comprising: chassis; A control board is housed within the housing, and a switch element is provided on the front side of the control board; The feature is that the housing has an integrally formed support portion, which is used to directly support the control board. The housing also houses a fixing element and a heat dissipation element. The heat dissipation element is fixed to the back of the control board by the fixing element and is closely attached to the area where the switching element is located.

2. The power tool according to claim 1, characterized in that, The support includes at least one guide groove, which is disposed on the inner wall of the housing and is used to support the control board.

3. The power tool according to claim 2, characterized in that, The support portion includes a first guide groove and a second guide groove, which are disposed on the front and rear sides of the housing.

4. The power tool according to claim 3, characterized in that, The first guide groove and the second guide groove have a height difference in the vertical direction, which allows the control board to be tilted and supported inside the housing.

5. The power tool according to claim 1, characterized in that, The fixing element is located on the front of the control panel, and there is one and only one fixing element.

6. The power tool according to claim 5, characterized in that, The switching element is a MOSFET arranged on the control board.

7. The power tool according to claim 6, characterized in that, The heat dissipation element is a heat sink, and the projection of the heat sink in the direction perpendicular to the control board completely covers the switching element.

8. The power tool according to claim 7, characterized in that, The fixing element is a screw, and the heat sink is connected to the control board by only one screw.

9. The power tool according to claim 8, characterized in that, The screw passes downwards from the front of the control board and is connected to the center of the heat sink.

10. The power tool according to claim 1, characterized in that, The lower end of the housing is provided with a battery connection part, which includes a terminal assembly and a push knob.

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