Electric tool

Abstract

The utility model provides an electric tool. The electric tool comprises a tool shell; a motor assembly housed in the tool housing and having a rotor and a stator that rotate about a rotation axis of the motor assembly; the output shaft is at least partially accommodated in the tool shell; the transmission mechanism transmits power of the motor assembly to the output shaft; the electric tool is characterized in that the electric tool further comprises a heat dissipation assembly, the heat dissipation assembly comprises a pump assembly, a cooling medium and a circulation pipeline, the pump assembly receives power of the motor assembly to enable the cooling medium to flow in the circulation pipeline, and at least part of the circulation pipeline is arranged on the circumferential outer side of the motor assembly and / or the transmission mechanism. And the service life of the electric tool is long.

Description

Technical Field

[0001] The present application relates to the technical field of power tools, and particularly to an electric tool. Background Art

[0002] With the development of power tool technology, high-power electric tools have emerged. High-power electric tools include high-torque impact wrenches, heavy-duty electric hammers, heavy-duty electric pickaxes, etc. High-power electric tools drive a transmission mechanism through a motor to achieve power output to an output shaft.

[0003] In related technologies, in order to achieve greater output, such as a high-torque impact wrench, an electric tool often needs to output a large amount of impact energy to an impact mechanism. Part of the energy is converted into power and output to the output shaft, and the other part is converted into heat and accumulated in the gearbox. In the case of long-term operation, a large amount of heat accumulates in the gearbox and is difficult to dissipate in time, resulting in the operation of the electric tool being affected. Summary of the Utility Model

[0004] Based on this, in view of the problem of heat dissipation of electric tools, it is necessary to provide an electric tool with a heat dissipation structure.

[0005] To solve the above technical problems, an embodiment of the present application provides an electric tool, including: a tool housing; a motor assembly received in the tool housing and having a rotor and a stator that rotate around the rotation axis of the motor assembly; an output shaft at least partially received in the tool housing; a transmission mechanism that transmits the power of the motor assembly to the output shaft; characterized in that the electric tool further includes a heat dissipation assembly, the heat dissipation assembly includes a pump assembly, a cooling medium, and a circulation pipeline, the pump assembly receives the power of the motor assembly to make the cooling medium flow in the circulation pipeline, and at least part of the circulation pipeline is disposed on the circumferential outer side of the motor assembly and / or the transmission mechanism.

[0006] As a further improvement of an embodiment of the present application, the heat dissipation assembly further includes a liquid storage tank, the liquid storage tank is communicated with the communication pipeline, and the cooling medium circulates between the communication pipeline and the liquid storage tank under the drive of the pump assembly.

[0007] As a further improvement of an embodiment of the present application, the tool housing is provided with an air inlet and an air outlet, an air flow channel enters from the air inlet and exits from the air outlet, and the air flow channel flows through the liquid storage tank.

[0008] As a further improvement of an embodiment of the present application, heat dissipation ribs are provided on the surface of the liquid storage tank, and the heat dissipation ribs extend along the air flow channel.

[0009] As a further improvement of an embodiment of the present application, at least part of the pump assembly is disposed in the liquid storage tank.

[0010] As a further improvement of an embodiment of the present application, the rotor includes a rotor shaft and a transmission member. The rotor shaft is fixedly connected to the transmission member, and the transmission member transmits the power of the motor assembly to the pump assembly.

[0011] As a further improvement of an embodiment of the present application, the pump assembly is adjacently disposed on the front side or the rear side of the motor assembly.

[0012] As a further improvement of an embodiment of the present application, at least part of the flow pipe is spirally wound around the circumferential outer side of the transmission mechanism.

[0013] As a further improvement of an embodiment of the present application, the tool housing includes a gear box, an intermediate cover, and a transmission housing. The flow pipe includes an outflow pipe, a heat dissipation pipe, an inflow pipe, and a connecting pipe. The connecting pipe is clamped on the through hole of the intermediate cover, and the connecting pipe communicates with the outflow pipe, the heat dissipation pipe, and the inflow pipe.

[0014] As a further improvement of an embodiment of the present application, a plurality of annular grooves are provided in the connecting pipe, and a plurality of sealing rings are respectively disposed in the plurality of annular grooves and are hermetically connected to the outflow pipe, the heat dissipation pipe, and the inflow pipe.

[0015] The electric tool provided by the present application transmits power to the pump assembly through the motor assembly, and then drives the cooling medium to flow in the flow pipe. The flow pipe disposed on the circumferential outer side of the motor assembly and / or the transmission mechanism can absorb the heat dissipated by it, realizing the cooling of the motor assembly and / or the transmission mechanism, and improving the service life of the electric tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional structure diagram of an electric tool in an embodiment of the present application;

[0017] Figure 2 is a schematic perspective view of an electric tool in an embodiment of the present application;

[0018] Figure 3 is a partial exploded schematic view of an electric tool in an embodiment of the present application;

[0019] Figure 4 is a partial exploded schematic view of an electric tool in an embodiment of the present application;

[0020] Figure 5 is Figure 1 a partial enlarged schematic view of part A in

[0021] Description of the Drawings: 1. Tool housing; 11. Air inlet; 12. Air outlet; 13. Gear box; 14. Intermediate cover; 15. Transmission housing; 2. Motor assembly; 21. Rotor; 211. Rotor shaft; 212. Transmission component; 213. Rotating fan; 22. Stator; 3. Output shaft; 4. Transmission mechanism; 5. Heat dissipation assembly; 51. Pump assembly; 52. Cooling medium; 53. Circulation pipeline; 531. Outflow pipe; 532. Heat dissipation pipe; 533. Inflow pipe; 534. Connecting pipe; 5341. Annular groove; 54. Liquid storage tank; 541. Heat dissipation rib; 542. Opening; 543. O-ring; 544. Screw; 55. Sealing ring. Detailed Embodiments

[0022] In order to make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In this application, unless otherwise clearly defined and limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0027] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0028] Referring to Figure 1 and Figure 2 , FIG. 1 shows a schematic cross-sectional structure diagram of a power tool in an embodiment of this application. Figure 2The perspective schematic diagram of a power tool in an embodiment of the present application is shown. An embodiment of the present application provides a power tool, which includes a tool housing 1, a motor assembly 2, an output shaft 3, a transmission mechanism 4, and a heat dissipation assembly 5. The motor assembly 2 is housed in the tool housing 1 and has a stator 22 and a rotor 21 that rotates around the rotation axis of the motor assembly 2. Preferably, the rotor 21 is an inner rotor. The output shaft 3 is at least partially housed in the tool housing 1 and is used to connect with a working accessory. The transmission mechanism 4 transmits the power of the motor assembly 2 to the output shaft 3. The heat dissipation assembly 5 at least includes a pump assembly 51, a cooling medium 52, and a circulation pipeline 53. The pump assembly 53 receives the power of the motor assembly 2 and drives the cooling medium 52 to flow in the circulation pipeline 53. At least part of the circulation pipeline 53 is arranged on the circumferential outer side of the motor assembly 2 and / or the transmission mechanism 4. It can be understood that the cooling medium 52 can be water, oil, or other solutes. Preferably, the cooling medium 52 is water, which is cheap, easy to obtain, and has a high specific heat capacity and heat transfer coefficient, and can effectively absorb and dissipate heat.

[0029] Further, the heat dissipation assembly 5 further includes a liquid storage tank 54. The liquid storage tank 54 is communicated with the circulation pipeline 53. The cooling medium 52 circulates between the liquid storage tank 54 and the circulation pipeline 53 under the drive of the pump assembly 51. This is beneficial to the integrated design of the heat dissipation assembly 5 and the power tool, facilitates the use of the power tool, and avoids the cumbersome process when using an external cooling medium 52. It can be understood that in order to make the cooling medium 52 circulate, the liquid storage tank 54 and the circulation pipeline 53 are hermetically connected.

[0030] Further, an air inlet 11 and an air outlet 12 are provided on the tool housing 1. The air flow channel enters the tool housing from the air inlet 11 and exits from the air outlet 12. The liquid storage tank 54 is arranged on the air flow channel, and the heat on the surface of the liquid storage tank 54 can be taken away by the flow of the air. Preferably, a rotating fan 213 is fixedly arranged on the rotor 21. The rotating fan 213 actively drives the flow of the air flow channel as the rotor 21 rotates, further enhancing the heat dissipation capacity of the liquid storage tank 54.

[0031] Refer to Figure 3 and Figure 4 , Figure 3 shows a partial exploded schematic diagram of the power tool in an embodiment of the present application. Figure 4 The partial exploded schematic diagram of the power tool in an embodiment of the present application is shown. Further, heat dissipation ribs 541 are convexly provided on the outer surface of the liquid storage tank 54, and the extending direction of the heat dissipation ribs 541 is the same as that of the air flow channel. In this way, the heat on the heat dissipation ribs 541 can be taken away more effectively, avoiding the continuous temperature rise of the cooling medium 52, enhancing the heat dissipation capacity of the heat dissipation assembly 5, and improving the service life of the power tool.

[0032] Further, the liquid storage tank 54 further includes an opening 542, an O-ring 543, and a screw 544. The opening 542 is a threaded hole. The screw 544 is threadedly fastened to the opening 542. The O-ring 543 is clamped between the screw 544 and the liquid storage tank 54 to prevent the loss of the cooling medium 52. When the screw 544 is unscrewed, the cooling medium 52 enters the liquid storage tank 54 through the opening 542.

[0033] In one or other embodiments, the pump assembly 51 is at least partially disposed in the liquid storage tank 54. The pump assembly 51 and the liquid storage tank 54 are installed in the tool housing 1 as an assembly, facilitating the assembly of the power tool.

[0034] Further, the rotor 21 includes a rotor shaft 211 and a transmission member 212, and the rotor shaft 211 is fixedly connected to the transmission member 212. The transmission member 212 transmits the power of the motor assembly 2 to the pump assembly 51. Preferably, the transmission member 212 is a gear, and the gear is in interference fit with the rotor shaft 211, or the transmission member is a shaft gear, and the shaft gear is integrally formed with the rotor shaft 211.

[0035] In one embodiment of the present application, the pump assembly 51 is disposed adjacent to the front side or the rear side of the motor assembly 2. The high-speed rotation of the rotor 21 can quickly drive the flow of the cooling medium 52 in the flow pipeline 53. The cooling medium 52 quickly absorbs the heat of the motor assembly 2 and / or the transmission mechanism 4 and quickly dissipates the heat through the liquid storage tank 54, realizing the rapid transfer of the heat inside the power tool and avoiding the long-term heat accumulation.

[0036] Further, the flow pipeline 53 is at least partially spirally wound around the circumferential outer side of the transmission mechanism 4. The wound flow pipeline 53 can absorb the heat of the transmission mechanism more comprehensively, timely reduce the temperature of the power tool, and ensure the normal use of the power tool.

[0037] In one embodiment of the present application, the tool housing 1 includes a gearbox 13, an intermediate cover 14, and a transmission housing 15. The circulation pipeline 53 includes an outflow pipe 531, a heat dissipation pipe 532, an inflow pipe 533, and a connecting pipe 534. The circulation pipeline 53 is divided into multiple sections for installation, which facilitates the assembly of the power tool and can reduce the pipeline cost. The connecting pipe 534 is snap-fitted on the through-hole of the intermediate cover 14, and the connecting pipe communicates with the outflow pipe 531, the heat dissipation pipe 532, and the inflow pipe 533. Generally, the intermediate cover 14 also absorbs the heat of the transmission mechanism 4. Therefore, the connecting pipe 534 is made of heat-resistant materials, which can be heat-resistant plastics and metals such as copper and iron. Preferably, when the bidirectional rotatable power tool is working properly, both the inflow pipe 533 and the outflow pipe 531 are lower than the internal height of the liquid storage tank 54. When the pump assembly 51 drives the cooling medium 52, the generated gas reaches the top of the liquid storage tank 54 under the action of buoyancy. Both the inflow pipe 533 and the outflow pipe 531 being lower than the internal height of the liquid storage tank 54 can prevent gas from entering the outflow pipe 531 and reaching the heat dissipation pipe 532 along with the outflow pipe 531. Moreover, since the specific heat capacity of the gas is smaller than that of the cooling medium 52, the heat absorption is slow and the heat is difficult to be absorbed in time.

[0038] Referring to Figure 5 , FIG. 5 shows Figure 1 a partial enlarged schematic view of part A in

[0039] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered that the scope described in this specification is covered.

[0040] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An electric tool, comprising: Tool housing (1); A motor assembly (2) housed in the tool housing (1) and having a stator (22) and a rotor (21) that rotates about the rotation axis of the motor assembly (2); An output shaft (3) at least partially housed in the tool housing (1); A transmission mechanism (4) that transmits the power of the motor assembly (2) to the output shaft (3); Characterized in that the power tool further includes a heat dissipation assembly (5), the heat dissipation assembly (5) includes a pump assembly (51), a cooling medium (52), and a circulation pipeline (53), the pump assembly (51) receives the power of the motor assembly (2) to make the cooling medium (52) flow in the circulation pipeline (53), and at least part of the circulation pipeline (53) is arranged on the circumferential outer side of the motor assembly (2) and / or the transmission mechanism (4); The heat dissipation assembly (5) further includes a liquid storage tank (54), the liquid storage tank (54) is communicated with the circulation pipeline (53), and the cooling medium (52) circulates between the circulation pipeline (53) and the liquid storage tank (54) under the drive of the pump assembly (51).

2. The electric tool according to claim 1, wherein The tool housing (1) is provided with an air inlet (11) and an air outlet (12), an air flow channel enters from the air inlet (11) and dissipates from the air outlet (12), and the air flow channel flows through the liquid storage tank (54).

3. An electric tool according to claim 2, characterized in that, Heat dissipation ribs (541) are provided on the surface of the liquid storage tank (54), and the heat dissipation ribs (541) extend along the air flow channel.

4. An electric tool according to claim 1, characterized in that, At least part of the pump assembly (51) is arranged in the liquid storage tank (54).

5. An electric tool according to claim 1, characterized in that, The rotor (21) includes a rotor shaft (211) and a transmission component (212), the rotor (21) shaft is fixedly connected to the transmission component (212), and the transmission component (212) transmits the power of the motor assembly (2) to the pump assembly (51).

6. An electric tool according to claim 1, characterized in that, The pump assembly (51) is adjacently arranged on the front side or the rear side of the motor assembly (2).

7. An electric tool according to claim 1, characterized in that, At least part of the circulation pipeline (53) is spirally wound around the circumferential outer side of the transmission mechanism (4).

8. An electric tool according to claim 1, characterized in that, The tool housing (1) includes a gear box (13), an intermediate cover (14) and a transmission housing (15), the circulation pipeline (53) includes an outflow pipe (531), a heat dissipation pipe (532), an inflow pipe (533) and a connecting pipe, the connecting pipe is clamped on the through hole of the intermediate cover (14), and the connecting pipe communicates the outflow pipe (531), the heat dissipation pipe (532) and the inflow pipe (533).

9. An electric tool according to claim 8, characterized in that, A plurality of annular grooves (5341) are provided in the connecting pipe (534), and a plurality of sealing rings (55) are respectively arranged in the plurality of annular grooves (5341) and are hermetically connected to the outflow pipe (531), the heat dissipation pipe (532) and the inflow pipe (533).

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