Electric tool

Abstract

The utility model relates to an electric tool. The electric tool comprises a shell; the cover body is detachably connected to the shell and provided with an air hole, and the air hole is communicated with an inner cavity of the shell; the pressure release valve is detachably connected to the cover body, and comprises a valve body embedded in the cover body; one end of the elastic piece is connected to the valve body; the movable part is connected to the other end of the elastic part, is matched with the air hole under the elastic action of the elastic part, and is hermetically connected with the cover body; and when the pressure of the inner cavity of the shell is increased to a preset pressure value, the elastic piece is compressed and deformed, the movable piece is separated from the air hole, and air in the inner cavity of the shell flows to the outside of the shell from the air hole. And when the air pressure of the inner cavity of the shell is reduced to be smaller than the preset pressure value, the movable piece is matched with the air hole under the elastic action of the elastic piece, so that the movable piece is hermetically connected with the cover body again. According to the electric tool, redundant gas in the inner cavity of the shell can be exhausted in time, the phenomena of grease overflow and cracking of the reduction gearbox are greatly reduced, and the using effect and the service life of the electric tool are further guaranteed.

Description

Technical Field

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

[0002] The gearbox of hammer and pick power tools generally needs to be filled with a lot of grease. On the one hand, it can lubricate and reduce friction and wear between moving parts such as gears and bearings; on the other hand, it can also prevent the intrusion of pollutants such as dust.

[0003] During use, the temperature inside the gearbox of hammer and pick power tools rises, causing the grease to liquefy and produce a large amount of gas. This increases the internal air pressure of the gearbox, which may cause partial failure of the rubber seal structure. Grease may leak out of the gearbox, affecting the service life of hammer and pick power tools. Utility Model Content

[0004] In view of this, the present application provides an electric tool to solve at least one problem existing in the background art.

[0005] In a first aspect, embodiments of this application provide an electric tool, the electric tool comprising:

[0006] case;

[0007] A cover body is detachably connected to the housing, and the cover body is provided with an air hole that communicates with the inner cavity of the housing;

[0008] A pressure relief valve, detachably connected to the cover, includes:

[0009] The valve body is fitted into the cover body;

[0010] An elastic element, one end of which is connected to the valve body;

[0011] A movable component is connected to the other end of the elastic component. Under the elastic force of the elastic component, the movable component matches the air hole and is sealed to the cover.

[0012] When the pressure inside the housing increases to a preset pressure value, the elastic element compresses and deforms, and the movable element disengages from the vent, allowing the gas inside the housing to flow from the vent to the outside of the housing.

[0013] In conjunction with the first aspect of this application, in an optional embodiment, the housing is provided with a first mounting groove, the cover is matched with the first mounting groove, the inner wall of the first mounting groove is provided with an internal thread, and the cover is provided with an external thread that matches the internal thread.

[0014] In conjunction with the first aspect of this application, in an alternative embodiment, the power tool further includes:

[0015] A first sealing element is connected between the cover and the housing to provide a sealed connection between the cover and the housing.

[0016] In conjunction with the first aspect of this application, in an optional embodiment, the cover is provided with a second mounting groove, the valve body is matched with the second mounting groove, the inner wall of the second mounting groove is provided with an internal thread, and the valve body is provided with an external thread that matches the internal thread.

[0017] In conjunction with the first aspect of this application, in an alternative embodiment, the power tool further includes:

[0018] A second sealing element is connected between the cover and the valve body to provide a sealed connection between the cover and the valve body.

[0019] In conjunction with the first aspect of this application, in an alternative embodiment, the movable element is a steel ball.

[0020] In conjunction with the first aspect of this application, in an alternative embodiment, the elastic element is a compression spring, and the outer diameter of the movable element matches the inner diameter of the compression spring.

[0021] In conjunction with the first aspect of this application, in an optional embodiment, the compression spring is a conical compression spring having a first end and a second end, the inner diameter of the first end of the conical compression spring being larger than the inner diameter of the second end, and the outer diameter of the movable member matching the inner diameter of the second end of the conical compression spring.

[0022] In conjunction with a first aspect of this application, in an alternative embodiment, the first mounting slot is located at the top of the housing.

[0023] In conjunction with the first aspect of this application, in an alternative embodiment, the vent is located at the bottom of the cover.

[0024] In the power tool provided in this application embodiment, the pressure relief valve is detachably connected to the cover, which is detachably connected to the housing. One end of the elastic element of the pressure relief valve is connected to the valve body, and the other end is connected to the movable element. Under the elastic force of the elastic element, the movable element matches the vent and seals with the cover. When the pressure in the housing cavity is normal, the housing cavity is sealed due to the seal between the movable element and the cover. When the pressure in the housing cavity increases to a preset pressure value, the elastic element is compressed and deformed under the pressure generated in the cavity, and the movable element disengages from the vent. The gas in the housing cavity flows out of the vent, thereby reducing the pressure in the housing cavity. When the gas pressure in the housing cavity drops below the preset pressure value, the movable element matches the vent under the elastic force of the elastic element, causing the movable element to seal with the cover again. This power tool can promptly discharge excess gas from the housing cavity, greatly reducing grease leakage and cracking of the gearbox, further ensuring the performance and service life of the power tool.

[0025] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0027] Figure 1 This is a three-dimensional structural diagram of the power tool provided in the embodiments of this application;

[0028] Figure 2 for Figure 1 Sectional view at point AA;

[0029] Figure 3a A schematic diagram of the first state of the pressure relief valve in the power tool provided in the embodiments of this application;

[0030] Figure 3b This is a schematic diagram of the second state of the pressure relief valve in the power tool provided in the embodiments of this application;

[0031] Figure 4 This is an exploded perspective view of the gearbox, cover, and pressure relief valve in the power tool provided in the embodiments of this application.

[0032] Figure label:

[0033] 100. Power tools;

[0034] 10. Housing; 110. Gearbox; 111. First mounting slot; 10a. Inner cavity;

[0035] 20. Cover; 201. Vent; 202. Second mounting slot;

[0036] 30. Pressure relief valve; 310. Valve body; 320. Elastic element; 321. First end; 322. Second end; 330. Moving part;

[0037] 40. First seal; 50. Second seal. Detailed Implementation

[0038] 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. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; 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.

[0039] In the description of this utility model, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" 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. In other words, they should not be construed as limitations on this utility model.

[0040] 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 indicate that at least one of those features is included. In the description of this utility model, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0041] 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 part; 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.

[0042] 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.

[0043] Please refer to Figure 1 The power tool 100 includes a housing 10, a motor (not shown), and a transmission mechanism (not shown). The motor and transmission mechanism are connected to the housing 10. The transmission mechanism connects the working head (not shown) and the motor. The motor provides driving force to be transmitted to the working head via the transmission mechanism. Specifically, the transmission mechanism includes a gearbox 110 and a reduction gear set (not shown) installed within the gearbox 110. The output shaft of the motor extends into the gearbox 110 and is connected to the reduction gear set. The reduction gear set is connected to the working head via an intermediate component. The motor drives the reduction gear set to rotate, thereby rotating the working head.

[0044] Generally, the gearbox 110 is cast from aluminum. The aluminum gearbox 110 contains micropores 201. When the internal pressure of the gearbox 110 is sufficiently high, cracking may occur, affecting the service life of the power tool 100. Additionally, the rubber seal structure of the gearbox 110 may fail, causing grease to leak out, further impacting the performance and service life of the power tool 100.

[0045] Based on this, this application provides an electric tool 100 with a detachable cover 20 connected to the housing 10, and a pressure relief valve 30 detachably connected to the cover 20. When the pressure in the inner cavity 10a of the housing 10 increases to a certain level, the movable part 330 in the pressure relief valve 30 disengages from the air hole 201, so that the gas in the inner cavity of the housing 10 can flow from the air hole 201 to the outside of the housing 10, thereby reducing the pressure inside the housing 10, greatly reducing the occurrence of grease overflow and cracking in the gearbox 110, and further ensuring the performance and service life of the electric tool 100.

[0046] For details, please refer to Figures 1 to 4The power tool 100 provided in this application embodiment includes a housing 10, a cover 20, and a pressure relief valve 30. The cover 20 is detachably connected to the housing 10 and has an air hole 201 that communicates with the inner cavity 10a of the housing 10. The pressure relief valve 30 is detachably connected to the cover 20.

[0047] The pressure relief valve 30 includes a valve body 310, an elastic element 320, and a movable element 330. The valve body 310 is embedded in the cover 20. One end of the elastic element 320 is connected to the valve body 310, and the other end is connected to the movable element 330. The movable element 330 matches the air hole 201 under the elastic force of the elastic element 320, so that the movable element 330 is sealed to the cover 20.

[0048] In the above-described power tool 100, when the pressure in the inner cavity 10a of the housing 10 is under normal conditions, the inner cavity 10a of the housing 10 is sealed due to the sealed connection between the movable member 330 and the cover 20. When the pressure in the inner cavity 10a of the housing 10 increases to a preset pressure value, the elastic member 320 is compressed and deformed under the pressure generated in the inner cavity 10a, and the movable member 330 disengages from the vent 201. The gas in the inner cavity of the housing 10 flows out of the vent 201 to the outside of the housing 10, thereby reducing the pressure in the inner cavity 10a of the housing 10. Figure 3b The diagram shows the state in which the movable part 330 is disengaged from the vent 201 under the pressure of the inner cavity 10a of the housing 10.

[0049] When the air pressure inside the housing 10 drops below the preset pressure value, the movable part 330 matches the air hole 201 under the elastic force of the elastic part 320, so that the movable part 330 and the cover 20 are resealed. Figure 3a The diagram shows the state of the movable member 330 matching the air hole 201 under the elastic force of the elastic member 320.

[0050] The power tool 100 can promptly expel excess gas from the inner cavity of the housing 10, greatly reducing the occurrence of grease overflow and cracking in the gearbox 110, and further ensuring the performance and service life of the power tool 100.

[0051] In this embodiment, the inner cavity of the housing 10 is the inner cavity of the gearbox 110, and the gearbox 110 is a part of the structure of the housing 10.

[0052] When the pressure inside the gearbox 110 is the first pressure value, and the force exerted by the pressure inside the gearbox 110 on the movable member 330 is equal to the force exerted by the elastic member 320 on the movable member 330, the preset pressure value in this embodiment is greater than the first pressure value. When the preset pressure value is greater than the first pressure value, the movable member 330 is lifted up by the pressure inside the gearbox 110 and disengages from the vent 201, so that the gas in the inner cavity of the gearbox 110 is discharged from the vent 201, thereby reducing the pressure in the inner cavity of the gearbox 110.

[0053] Preferably, the vent 201 is located at the middle position of the bottom of the cover 20 so that the gas in the inner cavity of the housing 10 can flow to the vent 201 to ensure exhaust efficiency.

[0054] In an alternative embodiment, such as Figure 4 As shown, the housing 10 is provided with a first mounting groove 111, and the cover 20 matches the first mounting groove 111. The inner wall of the first mounting groove 111 is provided with an internal thread, and the cover 20 is provided with an external thread that matches the internal thread. The cover 20 is detachably connected to the housing 10 by means of a threaded connection, which facilitates disassembly.

[0055] Furthermore, the first mounting groove 111 is located at the top of the housing 10 so that the gas generated in the inner cavity of the housing 10 can move upward and be discharged from the top of the housing 10, thereby improving the exhaust efficiency.

[0056] In an optional embodiment, the power tool 100 further includes a first seal 40 connected between the housing 10 and the cover 20 to seal the housing 10 and the cover 20. The first seal 40 is preferably a rubber ring, but is not limited to this. By using the first seal 40 connected between the housing 10 and the cover 20, a sealing effect can be ensured inside the gearbox 110.

[0057] In one optional embodiment, the cover 20 is provided with a second mounting groove 202, and the valve body 310 is embedded in the second mounting groove 202. The inner wall of the second mounting groove 202 is provided with an internal thread, and the outer wall of the valve body 310 is provided with an external thread that matches the internal thread. The valve body 310 is detachably connected to the cover 20 by means of a threaded connection, which facilitates the disassembly, replacement and maintenance of the valve body 310.

[0058] The valve body 310 is embedded in the cover 20, and the cover 20 is embedded in the housing 10, which can reduce the overall space occupied by the power tool 100 and ensure the compactness of the power tool 100.

[0059] In an optional embodiment, the power tool 100 further includes a second seal 50, which is connected between the cover 20 and the valve body 310 to ensure a sealing connection between the cover 20 and the valve body 310, further ensuring the sealing effect inside the gearbox 110. The second seal 50 is preferably an O-ring, but it is not limited to this.

[0060] In one optional embodiment, the movable component 330 is a spherical steel ball, and the vent 201 is a circular through hole. The steel ball falling into the vent 201 not only ensures the sealing effect between the movable component 330 and the cover 20, but also facilitates its removal from the vent 201, ensuring the flexibility of the movable component 330. Of course, the movable component 330 is not limited to a steel ball and can also be other shapes; this embodiment does not limit its application.

[0061] In an optional embodiment, the elastic element 320 is a compression spring, and the outer diameter of the movable element 330 matches the inner diameter of the compression spring to ensure a firm connection between the movable element 330 and the compression spring.

[0062] In an optional embodiment, the elastic element 320 is a conical compression spring having a first end 321 and a second end 322, wherein the inner diameter of the first end 321 is larger than the inner diameter of the second end 322. Figure 4 The diagram shows a conical compression spring, whose inner diameter gradually decreases from the first end 321 to the second end 322. The outer diameter of the movable part 330 matches the inner diameter of the second end 322 of the conical compression spring.

[0063] The compression spring is a conical compression spring, which not only ensures the firm connection between the moving part 330 and the compression spring, but also improves the compression capacity of the compression spring, thereby further improving the performance and service life of the power tool 100.

[0064] 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 application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A power tool characterized by comprising: The electric tool (100) comprises: a housing (10); a cover (20) detachably connected to the housing (10), the cover (20) being provided with an air hole (201) in communication with an inner cavity of the housing (10); a pressure relief valve (30) detachably connected to the cover (20), the pressure relief valve (30) comprising: a valve body (310) embedded in the cover (20); a resilient member (320) connected to one end of the valve body (310); a movable member (330) connected to the other end of the resilient member (320), the movable member (330) being matched with the air hole (201) under the elastic force of the resilient member (320) and being sealingly connected with the cover (20); wherein, when the pressure in the inner cavity of the housing (10) increases to a preset pressure value, the resilient member (320) is compressed and deformed, and the movable member (330) is separated from the air hole (201), and the gas in the inner cavity of the housing (10) flows from the air hole (201) to the outside of the housing (10).

2. The power tool of claim 1, wherein, The housing (10) is provided with a first mounting groove (111), the cover (20) is matched with the first mounting groove (111), the inner wall of the first mounting groove (111) is provided with an internal thread, and the cover (20) is provided with an external thread matched with the internal thread.

3. The power tool of claim 2, wherein, The electric tool (100) further comprises: a first sealing member (40) connected between the cover (20) and the housing (10) to sealingly connect the cover (20) and the housing (10).

4. The power tool of claim 1, wherein, The cover (20) is provided with a second mounting groove (202), the valve body (310) is matched with the second mounting groove (202), the inner wall of the second mounting groove (202) is provided with an internal thread, and the valve body (310) is provided with an external thread matched with the internal thread.

5. The power tool of claim 4, wherein, The electric tool (100) further comprises: a second sealing member (50) connected between the cover (20) and the valve body (310) to sealingly connect the cover (20) and the valve body (310).

6. The power tool of claim 1, wherein, The movable member (330) is a steel ball.

7. The power tool of claim 6, wherein, The resilient member (320) is a compression spring, and the outer diameter of the movable member (330) matches the inner diameter of the compression spring.

8. The power tool of claim 7, wherein, The compression spring is a conical compression spring, the conical compression spring has a first end (321) and a second end (322), the inner diameter of the first end (321) of the conical compression spring is greater than the inner diameter of the second end (322), and the outer diameter of the movable member (330) matches the inner diameter of the second end (322) of the conical compression spring.

9. The power tool of claim 2, wherein, The first mounting groove (111) is located at the top of the housing (10).

10. The power tool of claim 1 or 9, wherein, The air hole (201) is located at the bottom of the cover (20).

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