Power tool

Abstract

The utility model discloses a kind of electric tools, comprising: shell, is formed with battery connecting part, the battery connecting part is used to connect battery;Motor, at least part is housed in the shell;Transmission mechanism, is connected to the motor;Output mechanism, is connected to the transmission mechanism and is used to install tool accessory;Control device, at least part is housed in the shell and is used to control motor;Wherein, the material of the transmission mechanism at least includes at least one of first material and second material;The first material is organic macromolecular material, and the second material is inorganic non-metal material.The utility model designs corresponding electric tool to different working conditions, carries out performance directional optimization, builds working condition adaptation type transmission system, obtains high performance, lightweight, long life, low noise and environment-friendly electric tool.

Description

Technical Field

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

[0002] Power tools (such as electric drills, hammer drills, angle grinders, impact wrenches, etc.) are widely used in modern industrial manufacturing, construction and decoration, and home crafting. Their core function relies on an efficient and reliable power transmission system. Among them, the transmission mechanism is one of the core components of power tools. It usually contains a gearbox, which is responsible for converting the high-speed, low-torque rotation generated by the motor into the required speed, higher torque, or impact force output of the working end (such as drill bits, saw blades, grinding wheels). The performance of the transmission mechanism directly determines the tool's output power, efficiency, lifespan, noise level, and user experience.

[0003] Currently, the vast majority of power tools, especially professional-grade tools with medium to high power, high load, or long service life, primarily use metal materials for their transmission gears (including spur gears, helical gears, planetary gears, and worm gears). Common materials include: carburized steel, such as 20CrMnTi and 20CrMo, which achieves high surface hardness and wear resistance through carburizing and quenching while maintaining internal toughness; nitrided steel, such as 38CrMoAlA, which achieves high hardness and wear resistance with minimal deformation through nitriding treatment; powder metallurgy steel, which can be manufactured into complex shapes at a lower cost, but its strength and wear resistance are usually slightly lower than forged steel; and stainless steel, used in specific corrosion-resistant environments, but its cost and performance (such as wear resistance and strength) are generally inferior to carburized steel.

[0004] Despite the maturity and widespread application of metal gear technology, its inherent limitations are becoming increasingly apparent in the field of power tools, especially in the face of the growing demand for high-performance, lightweight, long-life, low-noise, and environmentally friendly tools. These limitations include heavy weight, high inertia, susceptibility to friction and wear, high dependence on lubrication, noise and vibration, high sensitivity to corrosion, and high manufacturing costs and energy consumption. Utility Model Content

[0005] The purpose of this utility model is to provide an electric tool that is lightweight, highly wear-resistant, and highly corrosion-resistant.

[0006] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0007] A power tool, comprising:

[0008] The housing has a battery connection portion for connecting a battery.

[0009] The motor is at least partially housed within the housing;

[0010] The transmission mechanism is connected to the motor;

[0011] An output mechanism is connected to the transmission mechanism and used for mounting tool accessories;

[0012] A control device, at least partially housed in the housing, is used to control the motor;

[0013] The material of the transmission mechanism includes at least one of the first material and the second material;

[0014] The first material is an organic polymer material, and the second material is an inorganic non-metallic material.

[0015] In one or more embodiments of the present invention, the transmission mechanism includes a transmission shaft made of a metal material, and a lubricating material layer is provided on the surface of the transmission mechanism, wherein the lubricating material is selected from at least one of molybdenum disulfide, polytetrafluoroethylene, and carbon nanotubes.

[0016] In one or more embodiments of this utility model, the organic polymer material is any one of nylon, polyoxymethylene, and polyetheretherketone.

[0017] In one or more embodiments of this utility model, the material of the transmission mechanism includes organic polymer materials and auxiliary materials, wherein the auxiliary materials are at least one of reinforcing fibers, ceramic particles, and metal particles;

[0018] The reinforcing fiber is at least one of carbon fiber and glass fiber; the ceramic particles are at least one of zirconium dioxide, silicon carbide, and silicon nitride; and the metal particles are at least one of aluminum powder, alumina, and titanium oxide.

[0019] In one or more embodiments of this utility model, the inorganic non-metallic material is at least one of silicon nitride and silicon carbide.

[0020] In one or more embodiments of this utility model, the power tool is an electric drill or an electric grinder, and the transmission mechanism includes a gearbox, which includes planetary gears, a sun gear, and a reduction gear. The planetary gears, sun gear, and reduction gear are made of nylon-based composite material.

[0021] In one or more embodiments of the present invention, the nylon-based composite material comprises nylon and glass fiber.

[0022] In one or more embodiments of this utility model, the power tool is an impact drill or a screwdriver, the transmission mechanism is made of polyoxymethylene, and the transmission mechanism further includes one or more gears, the surface of which is coated with polytetrafluoroethylene or molybdenum disulfide.

[0023] In one or more embodiments of this utility model, the power tool is an electric hammer, an electric wrench, or a cutting machine, and the transmission mechanism further includes one or more gears, which are made of a mixture of polyetheretherketone, carbon fiber, and ceramic particles.

[0024] In one or more embodiments of this utility model, the power tool is an angle grinder, an electric chainsaw, or a high-speed polisher, and the transmission mechanism further includes one or more gears made of ceramic.

[0025] Compared with existing technologies, this invention addresses the needs of power tools operating under various conditions by employing different engineering plastics such as nylon, polyoxymethylene, and polyetheretherketone, or even ceramic materials, to fabricate the transmission mechanism. This results in a transmission mechanism that is lightweight, highly rigid, highly wear-resistant, and highly corrosion-resistant. Furthermore, when using engineering plastics, the invention utilizes reinforcing fibers, lubricating materials, or ceramic particles in conjunction to strengthen the transmission mechanism or improve its interfacial lubrication, significantly enhancing the performance of the power tool. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the electric wrench in Embodiment 1 of this utility model;

[0028] Figure 2 This is a cross-sectional view of the electric wrench in Embodiment 1 of this utility model;

[0029] Figure 3 This is a schematic diagram of the electric drill in Embodiment 2 of this utility model;

[0030] Figure 4 This is a cross-sectional view of the electric drill in Embodiment 2 of this utility model;

[0031] Figure 5 This is a schematic diagram of the angle grinder in Embodiment 3 of this utility model. Figure 1 ;

[0032] Figure 6 This is a schematic diagram of the angle grinder in Embodiment 3 of this utility model. Figure 2 ;

[0033] Figure 7 This is a schematic diagram of the screwdriver in Embodiment 4 of this utility model;

[0034] Figure 8 This is a cross-sectional view of the screwdriver in Embodiment 4 of this utility model. Figure 1 ;

[0035] Figure 9 This is a cross-sectional view of the screwdriver in Embodiment 4 of this utility model. Figure 2 .

[0036] Explanation of key figure labels:

[0037] 11. First housing; 111. First battery connection; 12. First motor; 13. First gear; 14. First drive shaft; 15. First output shaft; 16. First control device; 21. Second housing; 211. Second battery connection; 22. Second motor; 23. Gearbox; 24. Gear set; 25. Second drive shaft; 26. Output chuck; 27. Second control device; 31. Third housing; 311. Third battery connection; 32. Third drive shaft; 33. Third gear; 34. Third control device; 35. Tool accessory; 41. Fourth housing; 411. Fourth battery connection; 42. Fourth motor; 43. Fourth gear; 44. Fourth drive shaft; 45. Fourth output shaft; 46. Fourth control device. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0039] Specifically, the limitations of existing metal gears include:

[0040] (1) Heavy weight: The high density of metal results in a large overall weight of the transmission mechanism and tool. For professionals or users who operate the tool by hand for a long time, an excessively heavy tool will significantly increase fatigue, affect work efficiency and operating comfort, and may even cause musculoskeletal strain.

[0041] (2) High inertia: The high quality of metal gears results in high rotational inertia. In applications that require frequent start-stop, speed change, or impact loads (such as impact wrenches and electric hammers), high inertia can lead to slower response speed, increased energy consumption, and may exacerbate the impact load on the transmission system.

[0042] (3) Friction and wear: Metal gear pairs experience sliding friction during meshing transmission. Even under good lubrication conditions, wear (pitting, scuffing, abrasive wear, etc.) will still occur during long-term operation, leading to decreased transmission efficiency, increased clearance, increased noise, and eventual failure. This limits the overall lifespan of gears and tools.

[0043] (4) High dependence on lubrication: Metal gears must rely on lubricating oil or grease to reduce friction, dissipate heat, and prevent wear. The lubrication system increases the complexity of the structure, cost, and maintenance requirements (regular replacement of lubricating grease is required). Once lubrication fails (such as grease aging, leakage, or contamination), the gears will be damaged rapidly. Maintaining effective lubrication is particularly difficult under extreme operating conditions (high temperature, low temperature, dust, humidity).

[0044] (5) Noise and vibration: The impact and friction vibration generated when metal gears mesh are the main noise sources of power tools. Although this can be improved through precision machining and design (such as helical gears), the metal material itself has limitations in vibration reduction and noise reduction.

[0045] (6) Corrosion sensitivity: Except for stainless steel, most commonly used gear steels are prone to rust in humid and corrosive environments (such as construction sites and outdoor operations), which affects performance and lifespan, requiring additional surface treatment or protection.

[0046] (7) Manufacturing cost and energy consumption: The manufacturing of metal gears (especially high-precision gears) usually involves complex forging, cutting (hogging, shaving, grinding) and heat treatment (carburizing, quenching, tempering) processes, which result in high energy consumption, long production cycle, and relatively low material utilization, leading to high overall manufacturing cost.

[0047] To overcome the aforementioned shortcomings of metal gears, this invention addresses the highly diverse load profiles and environmental conditions faced by power tools in practical applications. For example, the core challenge for high-speed, light-load tools (such as angle grinders and chainsaws) is the combination of release force and inertia, requiring ultra-lightweight design and high wear resistance; multi-stage reduction precision tools (such as electric drills and grinders) prioritize transmission smoothness and noise control; and high-impact load tools (such as hammer drills and electric arc machines) need to prioritize addressing impact fatigue and instantaneous overload issues. This invention designs corresponding power tools for different working conditions, performs performance-oriented optimization, and constructs a working condition-adaptive transmission system, resulting in high-performance, lightweight, long-life, low-noise, and environmentally friendly power tools.

[0048] This utility model provides an electric tool, comprising: a housing having a battery connection portion for connecting a battery; a motor at least partially housed in the housing; a transmission mechanism connected to the motor; an output mechanism connected to the transmission mechanism and used for mounting tool accessories; and a control device at least partially housed in the housing and used for controlling the motor; wherein the transmission mechanism is made of at least one of a first material and a second material; the first material is an organic polymer material, and the second material is an inorganic non-metallic material.

[0049] Furthermore, the transmission mechanism includes a transmission shaft made of metal material, and a lubricating material layer is provided on the surface of the transmission mechanism. The lubricating material is selected from at least one of molybdenum disulfide, polytetrafluoroethylene, and carbon nanotubes.

[0050] Furthermore, the first material can be any one of nylon, polyoxymethylene (POM), or polyetheretherketone (PEEK). Nylon has excellent wear resistance, self-lubricating properties, low noise, light weight, and good corrosion resistance; POM has excellent dimensional stability, good wear resistance, and excellent chemical resistance; PEEK has excellent chemical corrosion resistance, is lightweight, and has high wear resistance and high temperature resistance. Selecting these materials to manufacture the transmission mechanism can significantly improve its lightweight, wear resistance, and corrosion resistance.

[0051] Furthermore, the transmission mechanism is made of organic polymer materials and auxiliary materials. The auxiliary materials are at least one of reinforcing fibers, ceramic particles, and metal particles; the reinforcing fibers are at least one of carbon fibers and glass fibers; the ceramic particles are at least one of zirconium dioxide, silicon carbide, and silicon nitride; and the metal particles are at least one of aluminum powder, alumina, and titanium oxide.

[0052] Specifically, reinforcing fibers can compensate for the rigidity of the transmission mechanism and improve its mechanical properties; lubricating materials can improve the lubrication performance of the transmission mechanism and enhance its impact resistance; ceramic particles have high hardness, low density, and excellent corrosion resistance, which can improve the bending strength of the transmission mechanism, inhibit cracking, and extend its service life; adding metal microparticles can improve the strength of the transmission mechanism and extend its service life.

[0053] Furthermore, the second material is an inorganic non-metallic material, specifically at least one of silicon nitride and silicon carbide. Silicon nitride has high strength and high toughness, and excellent impact resistance, while silicon carbide has high hardness and wear resistance. Both also have excellent chemical corrosion resistance. Choosing silicon nitride and silicon carbide to manufacture transmission mechanisms can be applied to scenarios with high speed requirements.

[0054] Furthermore, the power tool is an electric drill or electric grinder, and the transmission mechanism includes a gearbox containing planetary gears, a sun gear, and a reduction gear, which are made of nylon-based composite material.

[0055] Specifically, nylon-based composite materials include nylon and glass fiber. Electric drills and grinders are single-stage and multi-stage reducers, characterized by low impact and low speed. Using nylon and glass fiber to make planetary gears, sun gears, and reduction gears in electric drills and grinders is beneficial. On the one hand, glass fiber can enhance the rigidity of nylon. On the other hand, the self-lubricating properties of nylon can reduce noise, which is conducive to open gearbox design and reduces heat dissipation pressure.

[0056] Furthermore, the power tool is an impact drill or a screwdriver, the transmission mechanism is made of polyoxymethylene, and the transmission mechanism also includes one or more gears, the surface of which is coated with polytetrafluoroethylene or molybdenum disulfide.

[0057] Specifically, in the medium speed and medium impact load type, impact drills and screwdrivers are common power tools. POM is chosen to manufacture gears. POM's excellent dimensional stability can give the transmission mechanism better impact resistance. At the same time, PPTFE or molybdenum disulfide coating is applied to the gear surface to achieve boundary lubrication, which further improves the gear's ability to cope with start-stop impacts.

[0058] Furthermore, the power tools are electric hammers, electric wrenches, or cutting machines, and the transmission mechanism includes one or more gears made of a mixture of polyetheretherketone, carbon fiber, and ceramic particles.

[0059] Specifically, in ultra-high load, high impact, and low speed working conditions, electric hammers, electric wrenches, or cutting machines are common power tools. Using polyetheretherketone (PEEK) as the matrix gives the gears high wear resistance and chemical corrosion resistance. Then, carbon fiber is used to enhance the bending strength and ceramic particles are used to inhibit crack propagation, which effectively improves the density of the gears and optimizes their fatigue fracture resistance.

[0060] Furthermore, the power tools include angle grinders, chainsaws, and high-speed polishers, and the transmission mechanism also includes one or more gears made of ceramic.

[0061] Specifically, in extreme speed zero-impact operating conditions, angle grinders, electric chainsaws, and high-speed polishers are common power tools. They use ceramic gears, which can give the gears high wear resistance and high strength. At the same time, they can be combined with surface polishing treatment to polish the surface to Ra≤0.1μm to reduce aerodynamic noise.

[0062] The present invention will be further described in detail below with reference to specific embodiments.

[0063] Example 1

[0064] Electric wrenches, such as Figure 1 and Figure 2As shown, it includes a first housing 11, a first motor 12, a first transmission mechanism, a first output mechanism, and a first control device 16. The first motor 12 is located in the first housing 11, and the first housing 11 is provided with a first battery connection portion 111 for connecting a battery. The first output mechanism includes a first output shaft 15 partially housed in the first housing 11. The first transmission mechanism includes a first transmission shaft 14 connected to the first motor 12 and the first output shaft 15 and transmitting the driving force of the first motor 12 to the first output shaft 15, and a first gear 13. The first control device 16 is located in the first housing 11 and is used to control the first motor 12.

[0065] The first drive shaft 14 is made of alloy steel, and the first gear 13 is made of polyetheretherketone, carbon fiber and ceramic nano-zirconia through a hot pressing process. Carbon fiber can enhance the bending strength of the gear, and nano-zirconia can inhibit the propagation of gear cracks, so that the electric wrench can be effectively used in ultra-high load, strong impact and low speed conditions.

[0066] Example 2

[0067] Electric drill, such as Figure 3 and Figure 4 As shown, it includes a second housing 21, a second motor 22, a second transmission mechanism, a second output mechanism, and a second control device 27. The second motor 22 is located in the second housing 21, and the second housing 21 is provided with a second battery connection portion 211 for connecting a battery. The second output mechanism includes an output chuck 26 housed in the second housing 21. The second transmission mechanism includes a gearbox 23, which contains a second transmission shaft 25 connected to the second motor 22 and the output chuck 26 and transmits the driving force of the second motor 22 to the output chuck 26, and a gear set 24. The gear set 24 includes planetary gears, a sun gear, and a reduction gear. The second control device 27 is located in the second housing 21 and is used to control the second motor 22.

[0068] The second drive shaft 25 is made of alloy steel, while the planetary gears, sun gear, and reduction gears are made of a composite material of nylon and glass fiber. The glass fiber enhances the rigidity of the nylon, and the self-lubricating properties of the nylon reduce noise, giving the electric drill the advantages of low noise and smooth transmission.

[0069] Example 3

[0070] Angle grinder, such as Figure 5 and Figure 6As shown, it includes a third housing 31, a third motor, a third transmission mechanism, a third output mechanism, and a third control device 34. The third motor is located in the third housing 31, and the third housing 31 is provided with a third battery connection part 311 for connecting a battery. The third output mechanism includes a third output shaft partially housed in the third housing 31, and the third output shaft is connected to a tool accessory 35. The third transmission mechanism includes a third transmission shaft 32 and a third gear 33 connected to the third motor and the third output shaft and transmitting the driving force of the third motor to the third output shaft. The third control device 34 is located in the third housing 31 and is used to control the third motor.

[0071] The third drive shaft 32 is made of alloy steel, and the third gear 33 is made of silicon nitride and silicon carbide ceramic particles. The manufacturing method is a conventional process, such as mixing silicon nitride and silicon carbide, pressing with a mold, calcining, and post-processing. The post-processing operation can polish the gear surface to make the gear surface roughness Ra≤0.1μm, so as to reduce aerodynamic noise.

[0072] Example 4

[0073] Screwdrivers, such as Figure 7 , Figure 8 and Figure 9 As shown, it includes a fourth housing 41, a fourth motor 42, a fourth transmission mechanism, a fourth output mechanism, and a fourth control device 46. The fourth motor 42 is located in the fourth housing 41, and the fourth housing 41 is provided with a fourth battery connection portion 411 for connecting a battery. The fourth output mechanism includes a fourth output shaft 45 partially housed in the fourth housing 41. The fourth transmission mechanism includes a fourth transmission shaft 44 and a fourth gear 43 connected to the fourth motor 42 and the fourth output shaft 45 and transmitting the driving force of the fourth motor 42 to the fourth output shaft 45. The fourth control device 46 is located in the fourth housing 41 and is used to control the fourth motor 42.

[0074] The fourth drive shaft 44 is made of alloy steel, and the fourth gear 43 is made of polyoxymethylene. The surface of the fourth gear 43 is coated with polytetrafluoroethylene to improve the boundary lubrication capability of the gear and improve its impact resistance.

[0075] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0076] 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. A power tool, characterized in that, include: The housing has a battery connection portion for connecting a battery. The motor is at least partially housed within the housing; The transmission mechanism is connected to the motor; An output mechanism is connected to the transmission mechanism and used for mounting tool accessories; A control device, at least partially housed in the housing, is used to control the motor; The material of the transmission mechanism includes at least one of the first material and the second material; The first material is an organic polymer material, and the second material is an inorganic non-metallic material.

2. The power tool according to claim 1, characterized in that, The transmission mechanism includes a transmission shaft made of metal material, and a lubricating material layer is provided on the surface of the transmission mechanism. The lubricating material is selected from at least one of molybdenum disulfide, polytetrafluoroethylene, and carbon nanotubes.

3. The power tool according to claim 1, characterized in that, The organic polymer material is any one of nylon, polyoxymethylene, and polyetheretherketone.

4. The power tool according to claim 1, characterized in that, The transmission mechanism is made of organic polymer materials and auxiliary materials, wherein the auxiliary materials are at least one of reinforcing fibers, ceramic particles, and metal particles. The reinforcing fiber is at least one of carbon fiber and glass fiber; the ceramic particles are at least one of zirconium dioxide, silicon carbide, and silicon nitride; and the metal particles are at least one of aluminum powder, alumina, and titanium oxide.

5. The power tool according to claim 2, characterized in that, The inorganic non-metallic material is at least one of silicon nitride and silicon carbide.

6. The power tool according to claim 2, characterized in that, The power tool is an electric drill or an electric grinder, and the transmission mechanism includes a gearbox, which contains planetary gears, a sun gear, and a reduction gear. The planetary gears, sun gear, and reduction gear are made of nylon-based composite material.

7. The power tool according to claim 6, characterized in that, The nylon-based composite material includes nylon and glass fiber.

8. The power tool according to claim 2, characterized in that, The power tool is an impact drill or a screwdriver, the transmission mechanism is made of polyoxymethylene, and the transmission mechanism also includes one or more gears, the surface of which is coated with polytetrafluoroethylene or molybdenum disulfide.

9. The power tool according to claim 2, characterized in that, The power tool is an electric hammer, an electric wrench, or a cutting machine, and the transmission mechanism further includes one or more gears, which are made of a mixture of polyetheretherketone, carbon fiber, and ceramic particles.

10. The power tool according to claim 2, characterized in that, The power tools are angle grinders, chainsaws, and high-speed polishers. The transmission mechanism also includes one or more gears, which are made of ceramic.

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