A three-gear symmetric driving type low-vibration electric hair clipper

Abstract

The application relates to the technical field of electric hair clippers, in particular to a three-gear symmetric driving type low-vibration electric hair clipper which comprises a shell, a power unit, a cooperative transmission unit and a cutter head module; the power unit is arranged in the shell, the cooperative transmission unit is in transmission connection with the power unit, and the cutter head module is in transmission connection with the cooperative transmission unit; the cooperative transmission unit comprises one driving gear and two driven gears which are symmetrically engaged on the two sides of the driving gear; the two driven gears rotate at the same speed and in the same direction, eccentric shafts are arranged on the end faces of the two driven gears respectively, and the two eccentric shafts are oppositely arranged at an angle of 180 DEG ; the cutter head module comprises a first moving cutter assembly and a second moving cutter assembly, and the two moving cutter assemblies are in transmission connection with the corresponding eccentric shafts; when the power unit works, the two moving cutter assemblies make reciprocating linear motion in opposite directions, and the reciprocating inertial forces generated by the two moving cutter assemblies are offset to each other. The application at least solves the problems of large vibration, high noise and easy wearing of parts of a single-moving-cutter electric hair clipper.

Description

Technical Field

[0001] This application relates to the field of electric hair clipper technology, and in particular to a three-gear symmetrical drive low-vibration electric hair trimmer. Background Technology

[0002] Electric hair clippers are commonly used power tools for daily haircuts and trimming. They rely on a motor to drive moving blades in high-speed reciprocating motion, which, together with fixed blades, completes the cutting operation. As living standards improve, users have increasingly stringent requirements for the user experience of electric hair clippers. Whether in professional haircutting scenarios or home haircutting scenarios, vibration has become a core pain point affecting the user experience.

[0003] Currently, most electric hair clippers on the market use a single-acting blade reciprocating cutting structure, meaning that only one set of moving blades performs high-frequency reciprocating linear motion in conjunction with a fixed blade to complete the cutting. This structure has an inherent flaw: the high-speed reciprocating motion of the moving blades generates periodic unbalanced inertial forces. These inertial forces have no offsetting path and are directly transmitted to the machine body, causing severe vibration throughout the entire unit. In professional hairdressing settings, hairdressers use the clippers for an average of 6-8 hours a day. Prolonged use can lead to numbness and soreness in the hands, and long-term use can easily induce occupational diseases such as carpal tunnel syndrome. At the same time, the vibration can cause unstable gaps between the moving and fixed blades, resulting in hair getting caught or pulled, reducing cutting accuracy. Continuous vibration can also accelerate the wear of internal bearings, gears, and other transmission components, shortening the product's lifespan and generating operating noise, affecting the comfort of the user environment.

[0004] In the context of home haircuts for infants and toddlers, the negative impact of vibration is even more pronounced. Infants and toddlers have sensitive scalps and underdeveloped nervous systems, making them extremely intolerant to the vibrations and accompanying noise from clippers. They generally exhibit an instinctive fear and resistance. During a haircut, the noticeable vibrations from the blades close to the scalp continuously stimulate the infant's sense of touch and hearing, exacerbating their anxiety and causing crying, twisting, and struggling. This not only significantly increases the difficulty for parents but also poses a safety hazard due to accidental head movements that could result in scratches or hair clippings. Prolonged negative haircut experiences can also lead to psychological resistance in infants and toddlers, further increasing the difficulty of cooperating with subsequent haircuts.

[0005] To alleviate the aforementioned vibration problem, existing technologies generally employ passive vibration reduction solutions, including adding rubber damping pads between the machine body and the blade, optimizing the dynamic balance of the blade's center of gravity, adding counterweights to the machine body, or replacing the motor with a low-vibration one. However, these solutions can only reduce some of the vibration transmitted to the machine body and cannot eliminate the vibration source at its root. The vibration reduction effect is limited, especially in reducing vibration in the blade area. This makes it difficult to meet the low-touch vibration requirements for infant haircuts, and it also increases the product size and production cost. Summary of the Invention

[0006] This application provides a three-gear symmetrical drive low-vibration electric hair trimmer to at least solve the technical problems of large vibration, high noise, and easy wear of parts in traditional single-action electric hair clippers.

[0007] To achieve the above objectives, this application provides a three-gear symmetrical drive low-vibration electric hair trimmer, including a housing, a power unit, a co-transmission unit, and a blade module. The power unit is disposed within the housing, the co-transmission unit is driven by the power unit, and the blade module is driven by the co-transmission unit. The co-transmission unit includes a driving gear and two driven gears symmetrically meshing on both sides of the driving gear. The two driven gears rotate in the same direction and at the same speed. Eccentric shafts are respectively provided on the end faces of the two driven gears, and the two eccentric shafts are arranged 180° opposite each other. The blade module includes a first moving blade assembly and a second moving blade assembly, and the two moving blade assemblies are driven by the corresponding eccentric shafts. When the power unit is working, the two moving blade assemblies perform reciprocating linear motion in opposite directions, and the resulting reciprocating inertial forces cancel each other out.

[0008] In some embodiments, the drive gear is fixedly connected to the output shaft of the power unit.

[0009] In some embodiments, the cooperative transmission unit further includes a gearbox, in which the driving gear and the two driven gears are rotatably mounted via rolling bearings.

[0010] In some embodiments, the cutter head module further includes a blade base and a fixed blade, the fixed blade being fixedly mounted on the front end of the blade base, and the first moving blade assembly and the second moving blade assembly being slidably attached to the inner side of the fixed blade.

[0011] In some embodiments, the first moving blade assembly includes a first moving blade and a first blade support, the first moving blade being fixed to the front end of the first blade support, and a first U-shaped transmission groove being provided at the rear end of the first blade support; the second moving blade assembly includes a second moving blade and a second blade support, the second moving blade being fixed to the front end of the second blade support, and a second U-shaped transmission groove being provided at the rear end of the second blade support.

[0012] In some embodiments, the eccentric shafts on the end faces of the two driven gears are respectively embedded in the corresponding first U-shaped transmission groove and the second U-shaped transmission groove, converting the rotational motion of the gears into the reciprocating linear motion of the moving tool assembly.

[0013] In some embodiments, the total mass difference between the first moving blade assembly and the second moving blade assembly does not exceed 5%, the eccentricity of the two eccentric shafts is equal, and the eccentricity error is not greater than 0.02 mm.

[0014] In some embodiments, the cutter head module further includes at least two sets of return springs, one end of which is connected to the blade base and the other end is connected to the first blade bracket or the second blade bracket, for pressing the moving blade against the surface of the fixed blade.

[0015] In some embodiments, the cutter head module further includes a cutter head fixing spring, which is disposed between the front end of the housing and the blade base, and detachably snaps the cutter head module to the front end of the housing.

[0016] In some embodiments, the fixed blade is provided with a first shearing tooth area and a second shearing tooth area that are symmetrically arranged from left to right. The shearing teeth of the first moving blade assembly are correspondingly engaged with the first shearing tooth area, and the shearing teeth of the second moving blade assembly are correspondingly engaged with the second shearing tooth area.

[0017] Based on the above, the advantages of this application's technical solution compared to the prior art are:

[0018] 1. Adopting a structural design that actively counteracts inertial forces, it eliminates vibration and reduces operating noise at the source, significantly improving user comfort, preventing numbness in the hands after prolonged use, and reducing the wear rate of parts, thus extending the product's service life.

[0019] 2. Suitable for infant and toddler haircutting scenarios, it can significantly reduce the vibration of the blade and the body, reduce tactile stimulation and auditory interference to the infant's scalp, effectively alleviate the infant's fear and resistance to hair clippers, reduce crying and struggling during the haircutting process, and improve the safety and experience of home haircutting.

[0020] 3. The three-gear symmetrical transmission structure achieves force self-balance, the radial forces on both sides of the driving gear cancel each other out, there is no risk of gear shaft bending and deformation, the tooth surface wear is uniform, the service life of the transmission mechanism is greatly improved, and the symmetrical structure has a higher assembly fault tolerance rate and lower processing and assembly costs.

[0021] 4. The overall structure is simple and compact. It can achieve same-direction transmission and reverse output by relying on three gear sets. The processing and assembly are simple and the production cost is easy to control.

[0022] 5. The dual-moving blades work symmetrically and in tandem, effectively increasing the cutting frequency and making haircutting and trimming more efficient;

[0023] 6. The symmetrical double shearing tooth zone design ensures uniform shearing force, avoids deformation of the fixed blade on one side, and further improves shearing accuracy and operational stability. Attached Figure Description

[0024] 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:

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0026] Figure 2 This is a cross-sectional view of an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the internal structure of an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the cutter head module structure according to an embodiment of this application;

[0029] Figure 5 This is an exploded view of the collaborative transmission unit in an embodiment of this application.

[0030] Explanation of reference numerals in the attached drawings: First moving blade 1a; Second moving blade 1b; First blade support 2a; Second blade support 2b; Fixed blade 3; Blade base 4; Return spring 5; Gear box 6; Drive gear 7; First eccentric shaft 8a; Second eccentric shaft 8b; First driven gear 9a; Second driven gear 9b; Motor 10; Battery 11; Blade head fixing spring 12; First U-shaped transmission groove 13a; Second U-shaped transmission groove 13b. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application. Furthermore, it is understood that although the efforts made in such a development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, modifications to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0032] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0033] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application means two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The terms “first,” “second,” “third,” etc., used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0034] This application provides a three-gear symmetrical drive low-vibration electric hair trimmer, including a housing, a power unit, a co-transmission unit, and a blade module. The power unit is disposed inside the housing, and the co-transmission unit is drivenly connected to the power unit. The blade module is drivenly connected to the co-transmission unit. The co-transmission unit includes a driving gear and two driven gears symmetrically meshing on both sides of the driving gear. The two driven gears rotate in the same direction and at the same speed. Eccentric shafts are respectively provided on the end faces of the two driven gears, and the two eccentric shafts are arranged 180° opposite each other. The blade module includes a first moving blade assembly and a second moving blade assembly. The two moving blade assemblies are drivenly connected to the corresponding eccentric shafts. When the power unit is working, the two moving blade assemblies perform reciprocating linear motion in opposite directions, and the reciprocating inertial forces generated cancel each other out.

[0035] Implementation, for example Figures 1-5As shown, a three-gear symmetrical drive low-vibration electric hair trimmer mainly consists of four major components: housing, power unit, co-transmission unit, and blade module.

[0036] The power unit consists of a battery 11 and a motor 10. The battery 11 is a rechargeable lithium battery, which is fixed inside the rear end of the housing to provide power to the motor 10. The motor 10 is a DC micro motor, which is fixedly installed at the front end of the battery 11. Its output axis extends forward and is connected to the co-drive unit for transmission.

[0037] The coordinated transmission unit includes a gearbox 6, a driving gear 7, a first driven gear 9a, a second driven gear 9b, rolling bearings (not shown in the figure), a first eccentric shaft 8a, and a second eccentric shaft 8b. The gearbox 6 is formed by a front cover and a rear cover fastened together with screws, creating a closed gearbox to prevent lubricant leakage and hair ingress. The driving gear 7, the first driven gear 9a, and the second driven gear 9b are all injection molded from engineering plastics. The first driven gear 9a and the second driven gear 9b are symmetrically arranged on the left and right sides of the driving gear 7 and are externally meshed with it. Rolling bearings are fitted at both ends of the central shafts of the three gears, providing rotatable support on the inner wall of the gearbox 6, ensuring smooth rotation without radial wobble. In some embodiments, the driving gear 7, the first driven gear 9a, and the second driven gear 9b are identical in size and number of teeth; in other embodiments, only the first driven gear 9a and the second driven gear 9b are identical in size and number of teeth.

[0038] The center hole of the drive gear 7 is fixedly connected to the output shaft of the motor 10 with an interference fit, serving as the drive wheel. The first eccentric shaft 8a is eccentrically fixed to the front end face of the first driven gear 9a, and the second eccentric shaft 8b is eccentrically fixed to the front end face of the second driven gear 9b. The eccentricity of the two eccentric shafts is exactly equal, with the error controlled within 0.02mm, and they are arranged 180° opposite each other in the circumferential direction.

[0039] The cutter head module includes a blade base 4, a fixed blade 3, a first moving blade assembly, a second moving blade assembly, and four sets of return springs 5. The fixed blade 3 is fixed to the front end of the blade base 4 by two screws, and has a first shearing tooth area and a second shearing tooth area integrally formed on it. The first moving blade assembly consists of a first moving blade 1a and a first blade support 2a. The first moving blade 1a is fixed to the front end of the first blade support 2a by riveting. The second moving blade assembly consists of a second moving blade 1b and a second blade support 2b. The second moving blade 1b is fixed to the front end of the second blade support 2b by riveting. The first and second moving blade assemblies are arranged symmetrically and can slide against the inner surface of the fixed blade 3. The rear end of the first blade support 2a has a first U-shaped transmission groove 13a, and the rear end of the second blade support 2b has a second U-shaped transmission groove 13b. The first eccentric shaft 8a is embedded in the first U-shaped transmission groove 13a, and the second eccentric shaft 8b is embedded in the second U-shaped transmission groove 13b.

[0040] Each of the left and right ends of the first blade holder 2a and the second blade holder 2b has an integrally formed spring lug. Four sets of return springs 5 ​​are respectively hooked between the corresponding spring lugs and the pre-set hooking parts on the blade base 4. The return springs 5 ​​provide a downward preload force, keeping the first moving blade 1a and the second moving blade 1b tightly pressed against the inner surface of the fixed blade 3 at all times, ensuring that the gap between the two is less than 0.05mm, thus ensuring the sharpness of the shearing.

[0041] A blade head fixing spring 12 is provided between the front end of the housing and the blade base 4. Both ends of the blade head fixing spring 12 are provided with hooks that can be inserted into the slots on the rear side of the blade base 4 to realize the quick disassembly and fixing of the blade head module, making it convenient for users to disassemble the blade head for cleaning and maintenance.

[0042] The battery 11 and motor 10 are located in the middle area of ​​the housing to further balance the weight and reduce vibration.

[0043] The working process of this application is as follows: When the power switch is pressed, the battery 11 supplies power to the motor 10, and the motor 10 drives the drive gear 7 to rotate clockwise. Since the first driven gear 9a and the second driven gear 9b are both externally meshed with the drive gear 7, the two driven gears rotate counterclockwise in the same direction at the same speed.

[0044] Since the first eccentric shaft 8a and the second eccentric shaft 8b are arranged 180° opposite each other on the two driven gears, when the first eccentric shaft 8a on the first driven gear 9a moves to the leftmost end, the second eccentric shaft 8b on the second driven gear 9b moves to the rightmost end; when the first eccentric shaft 8a moves to the rightmost end, the second eccentric shaft 8b moves to the leftmost end. Through the cooperation of the U-shaped transmission groove, the two eccentric shafts drive the first moving tool assembly and the second moving tool assembly to perform reciprocating linear motions in opposite directions.

[0045] Furthermore, because the total mass difference between the two moving blade assemblies is controlled within 5%, the reciprocating inertial forces they generate are almost equal in magnitude and opposite in direction, thus greatly reducing the overall machine vibration. Simultaneously, the driving gear 7 is subjected to a radial force to the right from the left driven gear and a radial force to the left from the right driven gear. These two forces are opposite in direction and cancel each other out, resulting in no additional vibration in the transmission system itself, achieving a dual vibration reduction effect. At the same time, the first moving blade assembly cooperates with the first shearing tooth area, and the second moving blade assembly cooperates with the second shearing tooth area, synchronously completing the shearing operation, effectively improving shearing efficiency compared to traditional single-moving blade trimmers.

[0046] Those skilled in the art should understand that the technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A three-gear symmetrical drive low-vibration electric hair trimmer, characterized in that: The device includes a housing, a power unit, a co-transmission unit, and a cutter head module. The power unit is housed within the housing, and the co-transmission unit is connected to it. The cutter head module is also connected to the co-transmission unit. The co-transmission unit includes a driving gear and two driven gears symmetrically meshing on both sides of the driving gear. The two driven gears rotate in the same direction and at the same speed. Eccentric shafts are respectively provided on the end faces of the two driven gears, and the two eccentric shafts are arranged at 180° opposite each other. The cutter head module includes a first moving cutter assembly and a second moving cutter assembly, and the two moving cutter assemblies are respectively connected to the corresponding eccentric shafts. When the power unit is working, the two moving cutter assemblies perform reciprocating linear motion in opposite directions, and the resulting reciprocating inertial forces cancel each other out.

2. The three-gear symmetrical drive low-vibration electric hair trimmer according to claim 1, characterized in that: The drive gear is fixedly connected to the output shaft of the power unit.

3. The three-gear symmetrical drive low-vibration electric hair trimmer according to claim 2, characterized in that: The cooperative transmission unit also includes a gearbox, in which the driving gear and the two driven gears are rotatably mounted via rolling bearings inside the gearbox.

4. The three-gear symmetrical drive low-vibration electric hair trimmer according to claim 1, characterized in that: The cutter head module also includes a blade base and a fixed blade. The fixed blade is fixedly installed at the front end of the blade base, and the first moving blade assembly and the second moving blade assembly are respectively slidably attached to the inner side of the fixed blade.

5. A three-gear symmetrical drive low-vibration electric hair trimmer according to claim 4, characterized in that: The first moving blade assembly includes a first moving blade and a first blade support. The first moving blade is fixed to the front end of the first blade support, and a first U-shaped transmission groove is provided at the rear end of the first blade support. The second moving blade assembly includes a second moving blade and a second blade support. The second moving blade is fixed to the front end of the second blade support, and a second U-shaped transmission groove is provided at the rear end of the second blade support.

6. A three-gear symmetrical drive low-vibration electric hair trimmer according to claim 5, characterized in that: The eccentric shafts on the end faces of the two driven gears are respectively embedded in the corresponding first U-shaped transmission groove and the second U-shaped transmission groove, converting the rotational motion of the gears into the reciprocating linear motion of the moving tool assembly.

7. A three-gear symmetrical drive low-vibration electric hair trimmer according to claim 6, characterized in that: The total mass difference between the first moving tool assembly and the second moving tool assembly does not exceed 5%, and the eccentricity of the two eccentric shafts is equal, with an eccentricity error of no more than 0.02 mm.

8. A three-gear symmetrical drive low-vibration electric hair trimmer according to claim 5, characterized in that: The blade module also includes at least two sets of return springs. One end of the return spring is connected to the blade base, and the other end is connected to the first blade bracket or the second blade bracket, for pressing the moving blade against the surface of the fixed blade.

9. A three-gear symmetrical drive low-vibration electric hair trimmer according to claim 4, characterized in that: The cutter head module also includes a cutter head fixing spring, which is located between the front end of the housing and the blade base, and detachably snaps the cutter head module to the front end of the housing.

10. A three-gear symmetrical drive low-vibration electric hair trimmer according to claim 4, characterized in that: The fixed blade is provided with a first shearing tooth area and a second shearing tooth area that are symmetrically arranged from left to right. The shearing teeth of the first moving blade assembly are correspondingly engaged with the first shearing tooth area, and the shearing teeth of the second moving blade assembly are correspondingly engaged with the second shearing tooth area.

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