Electric tool

Abstract

The invention provides an electric tool which comprises a tool shell, a reciprocating motion component and a heating component, the reciprocating motion component and the heating component are contained in the tool shell, the tool shell further comprises a swing piece part, and the swing piece part swings based on working vibration of the reciprocating motion component and generates airflow passing through the heating component. According to the electric tool, the swing piece part swings by means of working vibration of the reciprocating motion part and generates airflow passing through the heating part, and the heat dissipation capacity of the electric tool is improved in the form of the passive fan under the condition that the internal layout difficulty and potential safety hazards of the tool shell are not increased.

Description

Technical Field

[0001] The present invention relates to the field of electric tools, and more particularly to an electric tool whose reciprocating parts can generate vibrations when working. Background Art

[0002] Power tools generate a lot of heat during operation, which not only causes energy loss, but also has negative effects such as affecting insulation performance, increasing safety hazards, and shortening tool performance and life if not cooled in time. However, in order to improve the heat dissipation effect of power tools, in addition to increasing the technical research and development at the source, such as new thermal conductive materials, optimized motor design, and air duct design of power tools, it is also necessary to effectively cool down the high-temperature area at the application end. However, due to the influence of factors such as tool layout and power, related technologies are greatly restricted, and the industry has never stopped looking for continuous optimization solutions.

[0003] Therefore, it is necessary to improve the technical problems existing in the prior art. Summary of the invention

[0004] The main purpose of this application is to solve the problem of poor heat dissipation of electric tools.

[0005] In order to solve the above-mentioned technical problems, the present application provides an electric tool, including a tool housing and a reciprocating component and a heat-generating component accommodated in the tool housing. The tool housing also includes a pendulum portion, which swings based on the working vibration of the reciprocating component and generates an airflow passing through the heat-generating component.

[0006] The swing piece part includes a swing piece body having a fixed end and a free end, and the swing piece body swings with the fixed end as a fulcrum.

[0007] The pendulum piece part also includes a mass block formed or attached to the pendulum piece body and an elastic member connected between the pendulum piece part and the tool housing, and the pendulum piece body is a rigid member.

[0008] The swing piece body is in the shape of a flat strip, and the electric tool includes an output shaft that outputs axial reciprocating motion. The angle between the strip-shaped swing piece body and the output shaft in a side-view plane is between 70 degrees and 90 degrees.

[0009] The extension direction of the elastic member is parallel to the output shaft, and the distance from the connection point between the elastic member and the swing plate body to the fixed end is not less than 1 / 4 of the total length from the fixed end to the free end.

[0010] The included angle of the output shaft of the pendulum body on the side plane is 90 degrees, and the elastic member is a spring.

[0011] The pendulum piece portion and the reciprocating motion component have the same or similar vibration frequency.

[0012] The heat generating components are motors, controllers, circuit board assemblies and / or integrated switches.

[0013] The reciprocating motion component is a rocker bearing, a cam mechanism and / or a connecting rod mechanism.

[0014] The electric tool is a gun-type cordless tool, the tool housing comprises a handle, and the swing piece portion is arranged in the handle.

[0015] The swing piece portion of the present application utilizes the working vibration of the reciprocating component to generate swing and generate airflow passing through the heat-generating component. Through the form of a passive fan, the heat dissipation capacity of the electric tool is improved without increasing the difficulty of the internal layout of the tool housing and safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present application will be more fully understood by referring to the following detailed description of specific embodiments in conjunction with the accompanying drawings. Figure 1 A schematic diagram showing the structure of the electric tool of the present application; Figure 2 A schematic diagram showing the structure of the reciprocating motion component of the present application; Figure 3 A schematic diagram showing the structure of the swing piece part of the present application placed in the handle, wherein a parallel line of the output shaft is translated to indicate the angle between it and the swing piece body; Figure 4 The vibration principle diagram of the pendulum section of this application is shown. DETAILED DESCRIPTION

[0017] The following is combined with Figures 1 to 4 , a power tool according to an embodiment of the present invention is described in detail. The power tool comprises a tool housing 10 having a handle 101 and a reciprocating motion component 20 ( Figure 2 The reciprocating motion component 20 shown includes a swing bearing 201 rotating around an axis and an actuator 202 driven by the swing bearing 201 to generate reciprocating motion, and a heat generating component 30 (the so-called heat generating component mainly refers to a motor, a controller, a circuit board assembly and / or an integrated switch, etc., which generate a large amount of heat during operation and are sufficient to affect the performance of the tool. Figure 3The heat generating component 30 in the tool housing 10 is specifically an integrated switch, and the tool housing 10 further includes a swing piece 40, which swings based on the working vibration of the reciprocating motion component 20 and generates an airflow passing through the heat generating component 30. The swing piece 40 swings based on the working vibration of the reciprocating motion component 20 and generates an airflow passing through the heat generating component 30, and the heat dissipation capacity of the power tool is improved in the form of a passive fan without increasing the difficulty of the internal layout of the tool housing and the safety hazards.

[0018] The pendulum portion 40 and the reciprocating component 20 have the same or similar vibration frequency. When the vibration frequencies of the pendulum portion 40 and the reciprocating component 20 are consistent, the two resonate, so that the reciprocating motion of the electric tool itself can be better utilized to drive the pendulum portion 40 to achieve a better swing effect and generate the desired heat dissipation airflow. The pendulum portion 40 includes a pendulum body 401 having a fixed end 4011 and a free end 4012, and the pendulum body 401 swings with the fixed end 4011 as a fulcrum. The pendulum portion 40 also includes a mass block 402 formed or attached to the pendulum body 401 and an elastic member 403 connected between the pendulum portion 40 and the tool housing 10, and the pendulum body 401 is a rigid member. The frequency of the passive fan can be adjusted by the following formula to obtain the wind flow and heat dissipation effect that matches the reciprocating component 20: Where BPM is the vibration frequency; k is the stiffness of the spring; m is the mass of the swing piece 40; a is the distance between the spring and the fixed end 4011; l is the center of gravity. The mass block is preferably located at the free end 4012. When the swing piece 40 and the reciprocating motion component 20 have the same vibration frequency, the maximum swing angle θ of the swing piece 40 can also be designed (due to the hinge friction of the fixed end 4011, wind resistance, and mass block counterweight, the swing angle θ will be stabilized at a maximum value, which can assist the electric tool in making room for and layout of the internal space during design.

[0019] The pendulum body 401 is in the shape of a flat strip, and the electric tool includes an output shaft 203 that outputs axial reciprocating motion. The angle β between the strip-shaped pendulum body 401 and the output shaft 203 on the side plane is between 70 degrees and 90 degrees to help achieve the desired resonance and swing effects. Figure 3 The parallel line 203' with the output shaft is translated to indicate the angle β between it and the swing plate body 401. The extension direction of the elastic member 403 is parallel to the output shaft 203, and the distance from the connection point between the elastic member 403 and the swing plate body 401 to the fixed end 4011 is not less than 1 / 4 of the total length from the fixed end 4011 to the free end 4012. Figure 3In the embodiment shown, the swing plate body 401 is at an angle of 90 degrees to the output shaft 203 in a side view plane, and the elastic member 403 is a spring. In addition, the swing plate portion 40 in this embodiment is disposed in the handle 101, which not only effectively utilizes the handle space, but also because the handle of the gun-type power tool and the output shaft 203 are naturally at an angle suitable for the swing plate portion 40 to vibrate with the reciprocating motion component 20, it also eliminates the problem of wiring that may be caused by arranging an active fan.

[0020] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. For example, the reciprocating motion component in the above embodiment is a rocker bearing. In some other embodiments, the reciprocating motion component can also be any structural form that can realize reciprocating motion, such as a cam mechanism, a connecting rod mechanism, etc. Furthermore, based on the limited power of the cordless tool, the compactness of the internal layout, and the influence of the heating of more control components on the performance of the machine, the present application has a greater advantage for the cordless tool, that is, there is no need to set a separate active fan to generate airflow, and no additional energy is consumed, which will avoid the situation where the integrated switch frequently cuts off the power supply because the temperature rises rapidly and reaches the temperature protection point, causing the tool to stop frequently. However, the application of the technical solution itself is not limited to cordless tools. Therefore, the specific implementation method and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the present invention.

Claims

1. An electric tool, comprising a tool housing (10) and a reciprocating component (20) and a heat generating component (30) accommodated in the tool housing (10), characterized in that: The tool housing (10) also includes a swing piece portion (40), which swings based on the working vibration of the reciprocating component (20) and generates an airflow passing through the heat-generating component (30).

2. The electric tool according to claim 1, characterized in that: The swing piece portion (40) comprises a swing piece body (401) having a fixed end (4011) and a free end (4012), and the swing piece body (401) swings with the fixed end (4011) as a fulcrum.

3. The electric tool according to claim 2, characterized in that: The pendulum piece portion (40) further includes a mass block (402) formed or attached to the pendulum piece body (401) and an elastic member (403) connected between the pendulum piece portion (40) and the tool housing (10); the pendulum piece body (401) is a rigid member.

4. The electric tool according to claim 3, characterized in that: The swing piece body (401) is in the shape of a flat strip, and the electric tool comprises an output shaft (203) for axially outputting reciprocating motion. The angle between the strip-shaped swing piece body (401) and the output shaft (203) in a side-view plane is between 70 degrees and 90 degrees.

5. The electric tool according to claim 4, characterized in that: The extension direction of the elastic member (403) is parallel to the output shaft (203), and the distance from the connection point between the elastic member (403) and the swing plate body (401) to the fixed end (4011) is not less than 1 / 4 of the total length from the fixed end (4011) to the free end (4012).

6. The electric tool according to claim 5, characterized in that: The included angle of the swing plate body (401) and the output shaft (203) on the side plane is 90 degrees, and the elastic member (403) is a spring.

7. The electric tool according to any one of claims 1 to 6, characterized in that: The swing piece portion (40) and the reciprocating component (20) have the same or similar vibration frequency.

8. The electric tool according to any one of claims 1 to 6, characterized in that: The heat generating component (30) is a motor, a controller, a circuit board assembly and / or an integrated switch.

9. The electric tool according to any one of claims 1 to 6, characterized in that: The reciprocating component (20) is a rocker bearing, a cam mechanism and / or a connecting rod mechanism.

10. The electric tool according to any one of claims 1 to 6, characterized in that: The electric tool is a gun-type cordless tool, the tool housing (10) comprises a handle (101), and the swing piece portion (40) is arranged in the handle (101).

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