A power tool

Abstract

The application discloses an electric tool, which comprises a housing forming a first accommodating chamber; a motor arranged in the first accommodating chamber and used for outputting a rotary driving force; a gear box shell forming a second accommodating chamber, the gear box shell being arranged at one end of the housing and fixedly connected with the housing; a transmission mechanism receiving the rotary driving force of the motor, the transmission mechanism being at least partially accommodated in the second accommodating chamber; and a working accessory being rotationally fixed with the transmission mechanism; wherein the electric tool further comprises a gas pressure balance assembly fixedly connected with the gear box shell, the gas pressure balance assembly being in airtight communication with the gear box shell, the gas pressure balance assembly forming a third accommodating chamber, and the third accommodating chamber having a variable volume. The electric tool can improve the service life of the machine by improving the overflow of lubricating grease caused by the expansion of gas generated due to heat accumulation when the electric tool is operated for a long time.

Description

Technical Field

[0001] This application belongs to the field of tool technology, specifically relating to an electric tool. Background Technology

[0002] Power tools are handheld or portable mechanized tools powered by an electric motor or electromagnet, which drives the working head through a transmission mechanism. Currently, power tool gearboxes on the market employ a sealed design to prevent grease leakage. However, after prolonged use, the gearbox heats up, causing the internal gas to expand and generate significant pressure. This forces the grease inside the gearbox to leak out from poorly sealed areas. Over time, all the grease inside the gearbox leaks out, resulting in severe overheating.

[0003] Based on the above problems, there is an urgent need for a power tool to effectively depressurize the inside of the gearbox. Utility Model Content

[0004] The purpose of this application is to provide a power tool that can solve the problem of excessive internal pressure caused by gearbox heating after prolonged use.

[0005] To achieve the above objectives, a specific embodiment of this application provides the following technical solution: an electric tool, comprising:

[0006] The outer shell forms the first receiving chamber;

[0007] The motor is disposed within the first receiving cavity;

[0008] A gearbox housing forms a second receiving chamber, the gearbox housing being disposed at one end of the outer shell and fixedly connected to the outer shell;

[0009] A transmission mechanism connected to the motor, the transmission mechanism being at least partially housed within the second receiving chamber;

[0010] This also includes:

[0011] A pressure balancing assembly is fixedly connected to the gearbox housing, the pressure balancing assembly forms a third receiving chamber, the third receiving chamber is connected to the second receiving chamber, and the third receiving chamber has a variable volume.

[0012] Preferably, the variable volume of the third receiving chamber is at least 1 / 4 of the volume of the second receiving chamber.

[0013] Preferably, it also includes a working accessory connected to the transmission mechanism, and the air pressure balancing assembly is disposed on the end side of the gearbox housing away from the working accessory.

[0014] Preferably, the pressure balancing assembly further includes a variable element that forms a third receiving chamber, the variable element being made of an elastic material.

[0015] Preferably, the outer peripheral wall of the gearbox housing is further provided with a connecting portion, and the variable element is sleeved on the connecting portion to communicate with the second receiving chamber.

[0016] Preferably, the pressure balancing assembly further includes a sealing element, and the outer periphery of the connecting portion is provided with a groove, the sealing element being sleeved on the outer periphery of the variable element and engaging with the groove.

[0017] Preferably, it further includes a protective component, which covers the outer periphery of the pressure balancing component.

[0018] Preferably, the protective component includes a first protective member covering the periphery of the connecting portion and a second protective member covering the first protective member. The second protective member has an elastic buckle extending in the direction toward the first protective member, and the peripheral wall of the first protective member is provided with an opening that engages with the elastic buckle.

[0019] Preferably, the protective component further includes a vent, which is disposed on the first protective member and / or the vent is disposed on the second protective member.

[0020] Preferably, the power tool is an angle grinder.

[0021] The beneficial effects of this utility model are:

[0022] The angle grinder proposed in this utility model, by sealing and connecting a variable-volume air pressure balancing component with the gearbox housing, allows the expanding gas generated by heat accumulation during long-term operation of the angle grinder to be connected to the air pressure balancing component, thereby reducing the gas pressure inside the gearbox housing and preventing the leakage of lubricating grease. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of a power tool according to an embodiment of this application;

[0025] Figure 2 This is an exploded view of some components of a power tool in one embodiment of this application;

[0026] Figure 3 This is a cross-sectional view of a power tool according to an embodiment of this application;

[0027] Figure 4 for Figure 3 A magnified view of a portion of point A shown.

[0028] Explanation of key figure labels:

[0029] 1. Outer shell; 1a. First receiving chamber; 2. Motor; 3. Gearbox housing; 3a. Second receiving chamber; 31. Connecting part; 311. Groove; 4. Transmission mechanism; 5. Air pressure balancing assembly; 5a. Third receiving chamber; 51. Variable element; 52. Seal; 6. Working accessory; 7. Protective assembly; 71. First protective element; 711. Opening; 72. Second protective element; 721. Elastic buckle; 73. Vent. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of this application.

[0031] like Figures 1-3 As shown, an embodiment of the power tool in this application includes a housing 1, a motor 2, a gearbox housing 3, a transmission mechanism 4, and a pneumatic balancing assembly 5. The housing 1 has a first receiving chamber 1a inside; the motor 2 is disposed within the first receiving chamber 1a, receives external power, and outputs rotational driving force; the gearbox housing 3 has a second receiving chamber 3a, is disposed at one end of the housing 1, and is fixedly connected to the housing 1; the transmission mechanism 4 is connected to the motor 2 and receives the rotational driving force from the motor 2, and the transmission mechanism 4 is at least partially housed in the second receiving chamber 3a; the pneumatic balancing assembly 5 is fixedly connected to the gearbox housing 3. Preferably, the pneumatic balancing assembly 5 is disposed on the outer peripheral wall side of the gearbox housing 3, and the pneumatic balancing assembly 5 has a third receiving chamber 5a, which communicates with the second receiving chamber 3a and has a variable volume. By increasing the volume of the third receiving chamber 5a, the heated and expanding gas that was originally in the second receiving chamber 3a is circulated into the third receiving chamber 5a, thereby reducing the gas pressure in the second receiving chamber 3a and preventing the grease used for lubrication in the second receiving chamber 3a from leaking out of poorly sealed components (such as bearings), thus improving the grease leakage problem after long-term use.

[0032] It is understandable that the air pressure balancing component 5 can be a mechanical structure with variable volume, or it can be an elastic element with variable volume.

[0033] Furthermore, such as Figure 2 , Figure 3 As shown, in one embodiment of the power tool of this application, the variable volume of the third receiving chamber 5a is greater than or equal to 1 / 4 of the volume of the second receiving chamber 3a. Preferably, the variable volume of the third receiving chamber 5a is greater than or equal to 1 / 3 of the volume of the second receiving chamber 3a. It can be understood that the volume of the second receiving chamber 3a refers to the remaining volume after the internal volume of the gearbox housing 3 is discharged from the volume occupied by the transmission mechanism 4. In actual operation, assuming the ambient temperature is 0°C, after prolonged operation, the temperature of the gearbox housing 3 rises to 70°C. The air inside the gearbox housing 3 expands to approximately 1.25 times its original volume. The expanded volume can enter the third receiving chamber 5a to relieve the pressure inside the second receiving chamber 3a and reduce the possibility of grease leakage.

[0034] Furthermore, the power tool also includes a working attachment 6, which is connected to and driven by the transmission mechanism 4. A pneumatic balancing assembly 5 is disposed on the end of the gearbox housing 3 away from the working attachment 6. Preferably, during operation, the working attachment 6 faces downwards towards the working surface, and the pneumatic balancing assembly 5 is disposed on the upper end of the gearbox housing 3. This prevents grease from entering the third receiving chamber 5a due to gravity during operation, reducing the risk of grease depletion in the second receiving chamber 3a and improving the machine's service life.

[0035] Furthermore, the air pressure balancing assembly 5 also includes a variable element 51, which forms a third receiving chamber 5a. The variable element 51 is made of an elastic material, preferably a rubber product.

[0036] Furthermore, the outer peripheral wall of the gearbox housing 3 has a connecting portion 31, which extends outward from the outer peripheral wall of the gearbox housing 3. The variable element 51 is sleeved on the connecting portion 31 and communicates with the second receiving chamber 3a. Relying on its own elastic material properties, the variable element 51 is sleeved on the connecting portion 31 to form a seal with the second receiving chamber 3a, preventing grease from leaking out with the gas.

[0037] Furthermore, the air pressure balancing assembly 5 also includes a seal 52. The outer periphery of the connecting portion 31 is provided with an annular groove 311. The seal 311 is sleeved on the outer periphery of the variable element 51 and snapped into the annular groove 311. In this way, the sealing performance of the connection between the variable element 51 and the connecting portion 31 can be further enhanced.

[0038] Furthermore, the power tool also includes a protective component 7, which covers the outer periphery of the air pressure balancing component 5 to prevent external hard objects from hitting the air pressure balancing component 5, squeezing the third receiving chamber 5a, causing an increase in the gas pressure in the second receiving chamber 3a, and preventing grease leakage.

[0039] Furthermore, the protective component 7 includes a first protective member 71 and a second protective member 72. The first protective member 71 is disposed around the periphery of the pressure balancing component 5 and extends outward from the outer peripheral wall of the gearbox housing 3. The second protective member 72 covers the first protective member 71. The protective space formed by the first protective member 71, the second protective member 72, and the gearbox housing 3 prevents the pressure balancing component 5 from being affected by external factors. Preferably, the second protective member 72 is provided with an elastic buckle 721 extending toward the first protective member 71, and the peripheral wall of the first protective member 71 is provided with an opening 711 for engaging with the elastic buckle 721. The engagement of the first protective member 71 and the second protective member 72 provides comprehensive protection for the pressure balancing component 5.

[0040] Furthermore, the protective assembly 7 also includes a vent 73, which is disposed on the first protective member 71 and / or the second protective member 72. In this way, when the variable volume of the pressure balancing assembly 5 reaches its maximum, the gas in the protective space can be discharged into the outside air, thus preventing excessive gas pressure inside the second accommodating chamber 3a.

[0041] Furthermore, the power tools of this application may be angle grinders, etc., but are not limited to these. This application is particularly applicable to power tools with a sealed gearbox that generates a large amount of heat, but it should be noted that the power tools of this application are not limited to these.

[0042] In summary, the power tools in the embodiments of this application can promptly depressurize after the gas in the gearbox housing expands due to heat, preventing grease leakage and extending the service life of the power tools.

[0043] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An electric tool, comprising: The outer shell forms the first receiving chamber; The motor is disposed within the first receiving cavity; A gearbox housing forms a second receiving chamber, the gearbox housing being disposed at one end of the outer shell and fixedly connected to the outer shell; A transmission mechanism connected to the motor, the transmission mechanism being at least partially housed within the second receiving chamber; Its characteristic is that it further includes: A pressure balancing assembly is fixedly connected to the gearbox housing, the pressure balancing assembly forms a third receiving chamber, the third receiving chamber is connected to the second receiving chamber, and the third receiving chamber has a variable volume.

2. The power tool as described in claim 1, characterized in that, The variable volume of the third receiving chamber is at least 1 / 4 of the volume of the second receiving chamber.

3. The power tool as described in claim 1, characterized in that, It also includes a working accessory connected to the transmission mechanism, and the air pressure balancing assembly is disposed on the end side of the gearbox housing away from the working accessory.

4. The power tool as described in claim 1, characterized in that, The pressure balancing assembly also includes a variable element that forms a third receiving chamber, the variable element being made of an elastic material.

5. The power tool as described in claim 4, characterized in that, The outer peripheral wall of the gearbox housing is also provided with a protruding connecting portion, and the variable element is sleeved on the connecting portion to communicate with the second receiving chamber.

6. The power tool as described in claim 5, characterized in that, The pressure balancing assembly also includes a sealing element, and a groove is provided on the outer periphery of the connecting portion. The sealing element is sleeved on the outer periphery of the variable element and engages with the groove.

7. The power tool as described in claim 6, characterized in that, It also includes a protective component that covers the outer periphery of the pressure balancing component.

8. The power tool as claimed in claim 7, characterized in that, The protective assembly includes a first protective member covering the periphery of the connecting portion and a second protective member covering the first protective member. The second protective member has an elastic buckle extending in the direction toward the first protective member, and the peripheral wall of the first protective member is provided with an opening that engages with the elastic buckle.

9. The power tool as claimed in claim 8, characterized in that, The protective component further includes a vent, which is disposed on the first protective component and / or the vent is disposed on the second protective component.

10. The power tool as claimed in claim 1, characterized in that, The power tool is an angle grinder.

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