Electric tool gearbox and electric scissors with adjustable transmission ratio

Abstract

The utility model provides an electric tool gearbox and electric scissors convenient for adjusting transmission ratio relates to electric scissors equipment's technical field. Electric tool gearbox convenient for adjusting transmission ratio includes gear box, reduction gear group, movable inner tooth ring and magnetic drive driving assembly, reduction gear group sets up in the gear box, movable inner tooth ring slip cover sets up on reduction gear group, magnetic drive driving assembly sets up on the gear box, and magnetic drive driving assembly can drive movable inner tooth ring moves on reduction gear group. Electric scissors include motor, output shaft, scissors assembly and electric tool gearbox convenient for adjusting transmission ratio, and the output of motor is provided with sun gear, and sun gear is connected with one end transmission of reduction gear group, and the other end of reduction gear group is connected with output shaft transmission, and output shaft is connected with scissors assembly transmission. Reach the technical effect that electric tool adjusts transmission ratio is convenient.

Description

Technical Field

[0001] This utility model relates to the field of electric scissor equipment technology, and more specifically, to an electric tool gearbox and electric scissors with easily adjustable transmission ratio. Background Technology

[0002] Electric shears are tools used for pruning branches and trunks in orchards, gardens, and vine plants. Traditional electric shears can only adjust the cutting speed by controlling the input power of the motor through electronic components, or by setting a switch knob to adjust the transmission ratio of the machine when speed adjustment is needed. This is quite different from the expected simplicity and efficiency.

[0003] In existing technologies, traditional electric scissors generally use a fixed transmission ratio design, which cannot automatically match the motor speed and the torque output by the blade end according to the diameter of the object being cut. Alternatively, a mechanical manual adjustment mechanism can be set up to adjust the transmission ratio, but mechanical manual adjustment has a response lag and is inconvenient to operate. Utility Model Content

[0004] The purpose of this invention is to provide a power tool gearbox and electric scissors with an easily adjustable transmission ratio, so as to alleviate the technical problem of inconvenient transmission ratio adjustment in existing power tools.

[0005] In a first aspect, the present invention provides a power tool gearbox with an easily adjustable transmission ratio, comprising a gearbox, a reduction gear set, a movable internal gear ring, and a magnetic drive assembly;

[0006] The reduction gear set is disposed inside the gearbox, and the movable internal gear ring is slidably sleeved on the reduction gear set;

[0007] The magnetic drive assembly is mounted on the gearbox and is capable of driving the movable internal gear ring to move on the reduction gear set.

[0008] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the above-mentioned reduction gear set includes a first internal gear ring, a second internal gear ring, multiple sets of planetary teeth and multiple planetary carriers;

[0009] Both the first internal gear ring and the second internal gear ring are disposed in the gearbox, and the planetary gear and the planet carrier are disposed in the first internal gear ring and the second internal gear ring;

[0010] A gap is left between the first internal gear ring and the second internal gear ring, and the movable internal gear ring is located between the first internal gear ring and the second internal gear ring. The movable internal gear ring can mesh with the planetary teeth and the planet carrier.

[0011] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the planetary teeth include a first planetary tooth, a second planetary tooth, and a third planetary tooth, and the planet carrier includes a first planet carrier, a second planet carrier, and a third planet carrier;

[0012] The first planetary tooth is installed inside the first internal gear ring, the first planetary carrier is installed on a plurality of the first planetary teeth, the second planetary tooth is installed on the first planetary teeth, the second planetary carrier is installed on a plurality of the second planetary teeth, and the third planetary tooth is installed on the second planetary teeth and the third planetary carrier is installed on a plurality of the second planetary teeth;

[0013] The movable internal gear ring is slidably disposed on the first planet carrier, the second planetary tooth, and the second planet carrier. The movable internal gear ring can connect the second planetary tooth to the first planet carrier or the second planet carrier for synchronous rotation.

[0014] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein both the first planetary carrier and the second planetary carrier are provided with an external gear ring capable of meshing with the movable internal gear ring.

[0015] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the above-mentioned magnetic drive assembly includes a first excitation coil and a second excitation coil, and the movable internal gear ring is a magnetic internal gear ring;

[0016] The gearbox is provided with mounting slots for mounting the first excitation coil and the second excitation coil;

[0017] The movable internal gear ring is located between the first excitation coil and the second excitation coil, so that both the first excitation coil and the second excitation coil drive the movable internal gear ring to move.

[0018] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the first excitation coil corresponds to the first internal gear ring, and the second excitation coil corresponds to the second internal gear ring.

[0019] Secondly, this utility model embodiment provides an electric scissors, including a motor, an output shaft, a scissor assembly, and a power tool gearbox that facilitates adjustment of the transmission ratio;

[0020] The motor has a sun gear at its output end, which is connected to one end of the reduction gear set. The other end of the reduction gear set is connected to the output shaft, and the output shaft is connected to the scissor assembly.

[0021] Beneficial effects:

[0022] This utility model provides a power tool gearbox with an easily adjustable transmission ratio, including a gearbox, a reduction gear set, a movable internal gear ring, and a magnetic drive assembly; the reduction gear set is disposed inside the gearbox, and the movable internal gear ring is slidably sleeved on the reduction gear set; the magnetic drive assembly is disposed on the gearbox, and the magnetic drive assembly can drive the movable internal gear ring to move on the reduction gear set.

[0023] Specifically, in actual use, users can control the switch of the magnetic drive assembly and reverse the direction of the driving force on the movable internal gear ring by double-clicking the trigger of the power tool. This allows the magnetic drive assembly to drive the movable internal gear ring to slide on the reduction gear set, thereby changing the transmission ratio of the reduction gear set. This allows users to freely switch the transmission ratio of the reduction gear set according to different working conditions, enabling the power tool to better handle actual working conditions.

[0024] This utility model provides an electric scissor, including a motor, an output shaft, a scissor assembly, and a power tool gearbox for easy adjustment of the transmission ratio; the output end of the motor is provided with a sun gear, which is connected to one end of a reduction gear set, the other end of the reduction gear set is connected to the output shaft, and the output shaft is connected to the scissor assembly.

[0025] Electric scissors have the advantages mentioned above compared to existing technologies, which will not be elaborated here. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 A cross-sectional view of a first embodiment of the power tool gearbox with easily adjustable transmission ratio provided in this utility model.

[0028] Figure 2 An exploded view of the first embodiment of the power tool gearbox with easily adjustable transmission ratio provided by this utility model.

[0029] icon:

[0030] 10 – Motor; 20 – Output shaft; 30 – Scissor assembly; 40 – Sun gear;

[0031] 100 – Gearbox; 110 – Mounting slot; 120 – Guide groove;

[0032] 200 – Reduction gear set; 210 – First internal gear ring; 220 – Second internal gear ring; 231 – First planetary gear; 232 – Second planetary gear; 233 – Third planetary gear; 241 – First planetary carrier; 242 – Second planetary carrier; 243 – Third planetary carrier;

[0033] 300 – Movable internal gear ring; 310 – Connecting groove;

[0034] 400 – Magnetic drive assembly; 411 – First excitation coil; 412 – Second excitation coil. Detailed Implementation

[0035] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can 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.

[0039] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0040] See Figure 1 and Figure 2 As shown, this utility model embodiment provides a power tool gearbox with an easily adjustable transmission ratio, including a gearbox 100, a reduction gear set 200, a movable internal gear ring 300, and a magnetic drive assembly 400; the reduction gear set 200 is disposed inside the gearbox 100, and the movable internal gear ring 300 is slidably sleeved on the reduction gear set 200; the magnetic drive assembly 400 is disposed on the gearbox 100, and the magnetic drive assembly 400 can drive the movable internal gear ring 300 to move on the reduction gear set 200.

[0041] Specifically, in actual use, users can control the switch of the magnetic drive assembly and reverse the direction of the driving force on the movable internal gear ring by double-clicking the trigger of the power tool. This allows the magnetic drive assembly to drive the movable internal gear ring to slide on the reduction gear set, thereby changing the transmission ratio of the reduction gear set. This allows users to freely switch the transmission ratio of the reduction gear set according to different working conditions, enabling the power tool to better handle actual working conditions.

[0042] See Figure 1 and Figure 2 As shown, in the optional embodiment, the reduction gear set 200 includes a first internal gear ring 210, a second internal gear ring 220, multiple sets of planetary teeth, and multiple planet carriers; the first internal gear ring 210 and the second internal gear ring 220 are both disposed in the gearbox 100, and the planetary teeth and planet carriers are disposed in conjunction within the first internal gear ring 210 and the second internal gear ring 220; a gap is left between the first internal gear ring 210 and the second internal gear ring 220, and a movable internal gear ring 300 is located between the first internal gear ring 210 and the second internal gear ring 220, and the movable internal gear ring 300 can mesh with the planetary teeth and the planet carriers.

[0043] The planetary gears include a first planetary gear 231, a second planetary gear 232, and a third planetary gear 233. The planet carrier includes a first planet carrier 241, a second planet carrier 242, and a third planet carrier 243. The first planetary gear 231 is installed inside the first internal gear ring 210. The first planet carrier 241 is installed on multiple first planetary gears 231. The second planetary gear 232 is installed on the first planetary gear 231. The second planet carrier 242 is installed on multiple second planetary gears 232. The third planetary gear 233 is installed on the second planetary gear 232. The third planet carrier 243 is installed on multiple second planetary gears 232. The movable internal gear ring 300 is slidably disposed on the first planet carrier 241, the second planetary gear 232, and the second planet carrier 242. The movable internal gear ring 300 can connect the second planetary gear 232 to the first planet carrier 241 or the second planet carrier 242 for synchronous rotation.

[0044] Specifically, when using electric shears, the motor 10 drives the sun gear 40 to rotate, and the sun gear 40 can sequentially drive the first planetary gear 231, the first planetary carrier 241, the second planetary gear 232, the second planetary carrier 242, the third planetary gear 233, and the third planetary carrier 243 to rotate, ultimately driving the output shaft 20 to rotate. The output shaft 20 can drive the shear assembly 30 to move, thereby completing the pruning work.

[0045] The first planetary carrier 241 and the second planetary carrier 242 are each equipped with an external gear ring that can mesh with the movable internal gear ring 300. The movable internal gear ring 300 is fitted on the outside of the first planetary carrier 241, the second planetary carrier 242, and the second planetary gear 232. The magnetic drive assembly 400 can drive the movable internal gear ring 300 to slide on the outside of the first planetary carrier 241, the second planetary carrier 242, and the second planetary gear 232, thereby making the first planetary carrier 241, the second planetary gear 232, and the movable internal gear ring 300 mesh together, or making the second planetary carrier 242, the second planetary gear 232, and the movable internal gear ring 300 mesh together. This arrangement can change the overall transmission ratio of the reduction gear set 200.

[0046] It should be noted that when using electric shears, users can double-click the trigger to adjust the position of the movable internal gear ring 300, causing the first planetary carrier 241, the second planetary gear 232, and the movable internal gear ring 300 to mesh together, or causing the second planetary carrier 242, the second planetary gear 232, and the movable internal gear ring 300 to mesh together, thereby changing the overall transmission ratio of the reduction gear set 200. For example, when the electric shears need to prune thicker branches, the movable internal gear ring 300 can be adjusted to the maximum transmission ratio mode, thereby increasing the biting force of the electric shears and reducing the cutting speed of the shear assembly 30, allowing for smooth pruning of thicker branches; when the electric shears need to prune thinner branches, the movable internal gear ring 300 can be adjusted to the minimum transmission ratio mode, thereby reducing the biting force of the electric shears and increasing the cutting speed of the shear assembly 30, allowing for faster pruning of thinner branches and improving work efficiency.

[0047] See Figure 1 and Figure 2 As shown, in an optional embodiment, the magnetic drive assembly 400 includes a first excitation coil 411 and a second excitation coil 412, and the movable internal gear ring 300 is a magnetic internal gear ring; the gearbox 100 has a mounting slot 110 for mounting the first excitation coil 411 and the second excitation coil 412; the movable internal gear ring 300 is located between the first excitation coil 411 and the second excitation coil 412, so that the first excitation coil 411 and the second excitation coil 412 drive the movable internal gear ring 300 to move.

[0048] The first excitation coil 411 corresponds to the first internal gear ring 210, and the second excitation coil 412 corresponds to the second internal gear ring 220.

[0049] Specifically, the magnetic drive assembly 400 can adopt a magnetic drive structure composed of a first excitation coil 411 and a second excitation coil 412. When the first excitation coil 411 and the second excitation coil 412 are energized, they can form a magnetic field, which is used in conjunction with the magnetic movable internal gear ring 300. The first excitation coil 411 and the second excitation coil 412 can drive the movable internal gear ring 300 to move, thereby changing the transmission ratio of the reduction gear set 200.

[0050] In the case where the magnetic drive assembly 400 employs a first excitation coil 411 and a second excitation coil 412, the movable internal gear ring 300 employs a magnetic internal gear ring. Therefore, when the user adjusts the magnetic field direction of the first excitation coil 411 and the second excitation coil 412 by double-clicking the trigger, the first excitation coil 411 and the second excitation coil 412 can drive the magnetic movable internal gear ring 300 to move on the first planet carrier 241, the second planetary gear 232, and the second planetary carrier 242. This allows the first planet carrier 241, the second planetary gear 232, and the movable internal gear ring 300 to mesh together, or allows the second planetary carrier 242, the second planetary gear 232, and the movable internal gear ring 300 to mesh together, thereby changing the overall transmission ratio of the reduction gear set 200.

[0051] It should be noted that when the first excitation coil 411 and the second excitation coil 412 are energized, their magnetic field directions are symmetrical, so that the first excitation coil 411 and the second excitation coil 412 can work together to drive the movable internal gear ring 300.

[0052] It should be noted that when the magnetic drive assembly 400 uses the first excitation coil 411 and the second excitation coil 412, the movable internal gear ring 300 is made of permanent magnet material so that both the first excitation coil 411 and the second excitation coil 412 can drive the movable internal gear ring 300 to move.

[0053] This utility model embodiment provides an electric scissors, including a motor 10, an output shaft 20, a scissor assembly 30, and an electric tool gearbox for easy adjustment of the transmission ratio; the output end of the motor 10 is provided with a sun gear 40, which is connected to one end of a reduction gear set 200, the other end of the reduction gear set 200 is connected to the output shaft 20, and the output shaft 20 is connected to the scissor assembly 30.

[0054] The electric scissors provided in this embodiment have the advantages of the aforementioned power tool gearbox that facilitates the adjustment of the transmission ratio compared with the prior art, which will not be elaborated here.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A power tool gearbox with easily adjustable transmission ratio, characterized in that, include: Gearbox (100), reduction gear set (200), movable internal gear ring (300) and magnetic drive assembly (400); The reduction gear set (200) is disposed inside the gearbox (100), and the movable internal gear ring (300) is slidably sleeved on the reduction gear set (200); The magnetic drive assembly (400) is disposed on the gearbox (100), and the magnetic drive assembly (400) is capable of driving the movable internal gear ring (300) to move on the reduction gear set (200).

2. The power tool gearbox with easily adjustable transmission ratio according to claim 1, characterized in that, The reduction gear set (200) includes a first internal gear ring (210), a second internal gear ring (220), multiple sets of planetary teeth, and multiple planet carriers; The first internal gear ring (210) and the second internal gear ring (220) are both disposed in the gearbox (100), and the planetary gear and the planet carrier are disposed in the first internal gear ring (210) and the second internal gear ring (220); There is a gap between the first internal gear ring (210) and the second internal gear ring (220), and the movable internal gear ring (300) is located between the first internal gear ring (210) and the second internal gear ring (220). The movable internal gear ring (300) can mesh with the planetary teeth and the planet carrier.

3. The power tool gearbox with easily adjustable transmission ratio according to claim 2, characterized in that, The planetary teeth include a first planetary tooth (231), a second planetary tooth (232), and a third planetary tooth (233), and the planetary carrier includes a first planetary carrier (241), a second planetary carrier (242), and a third planetary carrier (243); The first planetary tooth (231) is installed inside the first internal gear ring (210), the first planet carrier (241) is installed on a plurality of the first planetary teeth (231), the second planetary tooth (232) is installed on the first planetary tooth (231), the second planet carrier (242) is installed on a plurality of the second planetary teeth (232), the third planetary tooth (233) is installed on the second planetary tooth (232), and the third planet carrier (243) is installed on a plurality of the second planetary teeth (232); The movable internal gear ring (300) is slidably disposed on the first planet carrier (241), the second planetary tooth (232) and the second planet carrier (242), and the movable internal gear ring (300) can connect the second planetary tooth (232) with the first planet carrier (241) or the second planet carrier (242) for synchronous rotation.

4. The power tool gearbox with easily adjustable transmission ratio according to claim 3, characterized in that, Both the first planetary carrier (241) and the second planetary carrier (242) are provided with external gear rings that can mesh with the movable internal gear ring (300).

5. The power tool gearbox with easily adjustable transmission ratio according to claim 3, characterized in that, The magnetic drive assembly (400) includes a first excitation coil (411) and a second excitation coil (412), and the movable internal gear ring (300) is a magnetic internal gear ring; The gearbox (100) is provided with a mounting slot (110) for mounting the first excitation coil (411) and the second excitation coil (412); The movable internal gear ring (300) is located between the first excitation coil (411) and the second excitation coil (412) so that the first excitation coil (411) and the second excitation coil (412) drive the movable internal gear ring (300) to move.

6. The power tool gearbox with easily adjustable transmission ratio according to claim 5, characterized in that, The first excitation coil (411) corresponds to the first internal gear ring (210), and the second excitation coil (412) corresponds to the second internal gear ring (220).

7. An electric scissors, characterized in that, Includes a motor (10), an output shaft (20), a scissor assembly (30), and a power tool gearbox with an adjustable transmission ratio as described in any one of claims 1-6; The output end of the motor (10) is provided with a sun tooth (40), which is connected to one end of the reduction gear set (200). The other end of the reduction gear set (200) is connected to the output shaft (20), and the output shaft (20) is connected to the scissor assembly (30).

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