Electric pruning shears

Abstract

The application relates to an electric pruning shears, which comprises a casing, a motor accommodated in the casing and having an output shaft, a transmission mechanism connected to the motor, a fixed support connected to the transmission mechanism, a fixed blade connected to the fixed support, a movable blade rotatably connected to the fixed support, a controller at least partially accommodated in the casing, a cooling fan rotatably connected to the casing, and a driving assembly for driving the cooling fan to rotate, thereby improving the heat dissipation efficiency inside the casing.

Description

Technical Field

[0001] This application relates to the field of garden tools technology, and in particular to electric pruning shears. Background Technology

[0002] With the development of garden tools, pruning shears for pruning fruit branches have emerged. Pruning shears have become popular among horticultural workers due to their portability and ease of use.

[0003] In related technologies, Chinese patent CN2865254Y discloses an electric pruning shear that drives a DC brushless motor. Through the aforementioned IC control system, the movement of the finger trigger and the opening and closing of the blade assembly are synchronized. That is, when a person pulls the finger trigger inward, the upper blade moves downward to perform the cutting function. After the cutting action is completed, as long as the finger is released, the upper blade immediately rises to enter a standby state. Thus, the IC circuit control system includes a linear Hall effect sensor S mounted on the trigger and its corresponding inductive magnet S4; and front and rear positioning Hall effect sensors S2 and S3 mounted on the upper housing and their corresponding inductive magnets S1 mounted on the ball nut, thereby controlling the closing of the blades in this novel electric pruning shear.

[0004] However, existing electric pruning shear motors suffer from heat buildup and poor heat dissipation during operation, which can damage internal components and controller parts, leading to a reduced lifespan. Therefore, improvements are needed. Utility Model Content

[0005] Therefore, it is necessary to provide an electric pruning shear to address the problem of poor heat dissipation in electric shears.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows: In one embodiment, an electric pruning shear is provided, comprising: chassis; The motor is housed in the housing and has an output shaft; A transmission mechanism connected to the motor; A fixed bracket is connected to the transmission mechanism; A fixed blade is connected to the fixed bracket; The moving blade is rotatably connected to the fixed bracket; The controller is at least partially housed within the housing; A cooling fan is rotatably connected to the housing. The drive component drives the cooling fan to rotate.

[0007] In some or other preferred embodiments, the drive assembly includes a speed-increasing component connected to the cooling fan and the output shaft.

[0008] In some or other preferred embodiments, the speed-increasing component includes a planetary carrier, planetary gears, a sun gear, and an internal gear ring. The internal gear ring is connected to the output shaft of the motor and meshes with the planetary gears. The planetary gears are located on one side of the planetary carrier, and the sun gear is located on the other side of the planetary carrier. The sun gear is connected to the cooling fan.

[0009] In some or other preferred embodiments, the drive assembly further includes a one-way clutch mechanism located between the output shaft and the internal gear ring; and / or, it further includes a one-way limiting member disposed between the housing and the cooling fan; and / or, the speed ratio of the speed-increasing component is at least 2.

[0010] In some or other preferred embodiments, when the moving blade moves away from the fixed blade, the output shaft rotates in a first direction; when the moving blade moves closer to the fixed blade, the output shaft rotates in a second direction. The one-way clutch mechanism restricts rotation in the first direction and allows rotation in the second direction. The one-way limiting member prevents the cooling fan from rotating in the second direction and allows the cooling fan to rotate in the first direction. The one-way clutch mechanism is a one-way bearing or a one-way clutch. The one-way limiting member is a pawl limiting mechanism or a one-way bearing.

[0011] In some or other preferred embodiments, the cooling fan is provided with a counterweight having a first position and a second position. When the speed of the cooling fan exceeds a predetermined value, the counterweight is located in the first position, and when the speed of the cooling fan is less than the predetermined value, the counterweight is located in the second position.

[0012] In some or other preferred embodiments, the cooling fan is provided with a slide that extends radially along the cooling fan, a first position located at one end of the slide away from the center of the cooling fan, and a second position located at one end of the slide close to the center of the cooling fan.

[0013] In some or other preferred embodiments, the counterweight is a ball bearing, and the end of the slide away from the center of the cooling fan is provided with a closure.

[0014] In some or other preferred embodiments, an elastic element is provided in the slide, one end of which is connected to a first position and the other end is connected to the counterweight. The elastic element has a tendency to bias the counterweight toward the center of the cooling fan.

[0015] In some or other preferred embodiments, the housing has a grip portion, an air inlet is provided at one end of the grip portion near the fixed blade, the housing has a battery connection portion, and an air outlet is provided at the battery connection portion.

[0016] In this embodiment, the cooling fan in the housing is driven by the drive component to rotate, thereby promoting heat exchange between the air inside and outside the housing, reducing heat accumulation, lowering the temperature inside the housing, and improving the service life of the electric pruning shears. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the electric pruning shears in one embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of an electric pruning shears in one embodiment of this application;

[0018] Figure 3 This is an exploded view of the structure at the speed-up component in one embodiment of this application; Figure 4 This is an exploded view of the structure at the speed-up component in one embodiment of this application from another perspective.

[0019] Figure Descriptions: 1. Housing; 11. Motor; 111. Output Shaft; 12. Transmission Mechanism; 13. Fixed Bracket; 14. Fixed Blade; 15. Moving Blade; 16. Controller; 17. Grip; 171. Air Inlet; 172. Air Outlet; 2. Cooling Fan; 21. Slide Rail; 22. Elastic Component; 3. Drive Assembly; 31. Speed ​​Increaser; 311. Planetary Carrier; 312. Planetary Gear; 313. Sun Gear; 314. Internal Gear Ring; 32. One-Way Clutch Mechanism; 33. Enclosure; 4. One-Way Limiting Component; 5. Counterweight. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "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 based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not 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 application.

[0022] 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0026] See Figure 1 and Figure 2 Figure 1 shows a schematic diagram of the overall structure of the electric pruning shears in one embodiment of this application, and Figure 2 shows a schematic diagram of the internal structure of the electric pruning shears in one embodiment of this application. The electric pruning shears provided in one embodiment of this application include a housing 1, a motor 11, a transmission mechanism 12, a fixed bracket 13, a fixed blade 14, a moving blade 15, a controller 16, a cooling fan 2, and a drive assembly 3. The motor 11 is housed in the housing 1 and has an output shaft 111. The transmission mechanism 12 is connected to the motor 11. The transmission mechanism 12 can be a direct output transmission shaft, a gear set, or a gearbox. In this embodiment of the application, the transmission mechanism 12 is a three-stage reduction gear set.

[0027] The fixed bracket 13 can be connected to the transmission mechanism 12; specifically, the fixed bracket 13 can be threaded onto the transmission mechanism 12. The fixed blade 14 can be connected to the fixed bracket 13, and the fixed bracket 13 can have a mounting groove. The fixed blade 14 is inserted into the mounting groove and fixed with bolts. The movable blade 15 can be rotatably connected to the fixed bracket 13; specifically, the movable blade 15 can be coaxially arranged with the fixed blade 14. The controller 16 is at least partially housed in the housing 1, and the controller 16 is located at the end of the housing 1 away from the fixed blade 14. The controller 16 controls the movable blade 15 to lift after shearing, thereby completing one shearing action.

[0028] The cooling fan 2 is rotatably connected to the casing 1. The cooling fan 2 can be an axial fan or a radial fan, as long as it can force the air inside the casing 1 to flow to the outside of the casing 1 and exchange heat with the outside air. The drive assembly 3 drives the cooling fan 2 to rotate. The drive assembly 3 can use the power of the motor 11 itself, or a separate motor 11 can be installed inside the casing 1 to drive the cooling fan 2, thereby dissipating heat from inside the casing 1.

[0029] In some or other preferred embodiments, the housing 1 may have a gripping portion 17, and the housing 1 may have an air inlet 171 at one end of the gripping portion 17 near the fixed blade 14. The housing 1 may also have a battery connection portion and an air outlet 172 at the battery connection portion. The cooling fan 2 rotates under the drive of the output shaft 111, drawing air from the air inlet 171 and expelling air from the air outlet 172, thereby promoting heat exchange between the housing 1 and the outside.

[0030] See Figure 2 and Figure 3 Figure 3 shows an exploded view of the speed-increasing component structure in one embodiment of this application. In some or other preferred embodiments, the drive assembly 3 further includes a speed-increasing component 31, which is connected between the cooling fan 2 and the output shaft 111, thereby increasing the speed transmitted from the output shaft 111 to the cooling fan 2. Since the motor 11 typically needs to run for a short time during the shearing process of the moving blade 15, the cooling fan 2, directly driven by the output shaft 111, rotates too few times, resulting in limited heat dissipation effect of the cooling fan 2 on the interior of the housing 1. By increasing the speed transmitted from the output shaft 111 to the cooling fan 2 through the speed-increasing component 31, the rotational speed of the cooling fan 2 when the motor 11 starts once is increased, thereby improving the heat dissipation effect inside the housing 1.

[0031] In some or other preferred embodiments, the speed-increasing component 31 includes a planetary carrier 311, planetary gears 312, a sun gear 313, and an internal gear ring 314. The internal gear ring 314 can be connected to the output shaft 111 of the motor 11. The planetary carrier 311 is fixed inside the housing 1. The planetary gear 312 is mounted on one side of the planetary carrier 311, and the sun gear 313 is mounted on the other side. The internal gear ring 314 meshes with the planetary gear 312. The planetary gear 312 is located on one side of the planetary carrier 311, and the sun gear 313 is located on the other side of the planetary carrier 311. The sun gear 313 is connected to the cooling fan 2, thereby increasing the speed of the output shaft 111 to the cooling fan 2 through the planetary gear set 312.

[0032] See Figure 3 and Figure 4Figure 4 shows an exploded view of the speed-increasing component structure from another perspective in one embodiment of this application. In some or other preferred embodiments, the drive assembly 3 may further include a one-way clutch mechanism 32, which is located between the output shaft 111 and the internal gear ring 314. The one-way clutch mechanism 32 enables the output shaft 111 and the internal gear ring 314 to lock together when rotating in a first direction, that is, the one-way clutch mechanism 32 restricts rotation in the first direction; here, the first direction refers to the rotation direction of the motor 11 when the moving blade 15 pivots away from the fixed blade 14. When the output shaft 111 and the internal gear ring 314 rotate in a second direction opposite to the first direction, the output shaft 111 and the internal gear ring 314 can rotate relatively freely; here, the second direction is the operating direction of the motor 11 when the moving blade 15 pivots closer to the fixed blade 14. The rotation of the output shaft 111 and the internal gear ring 314 in the second direction can be as follows: the output shaft 111 is stationary while the internal gear ring 314 rotates in the second direction; the internal gear ring 314 is stationary while the output shaft 111 rotates in the second direction; or the output shaft 111 rotates in the second direction with a different relative speed to the internal gear ring 314.

[0033] In some or other preferred embodiments, a one-way limiting member 4 may also be included, which is installed between the housing 1 and the cooling fan 2. The one-way limiting member 4 prevents the cooling fan 2 from rotating in the second direction, but allows the cooling fan 2 to rotate in the first direction. In particular, the one-way limiting member 4 may be a ratchet and pawl structure or a one-way bearing, wherein the ratchet is disposed on the housing 1 and the pawl is disposed on the fan blade. In this embodiment, the one-way limiting member 4 is a one-way bearing, thereby limiting the one-way rotation of the cooling fan 2 and reducing the impact of the forward and reverse rotation of the output shaft 111 caused by the forward and reverse rotation of the motor 11 on the speed of the cooling fan 2.

[0034] In some or other preferred embodiments, the speed ratio of the speed-increasing component 31 is at least 2. In this embodiment, the speed ratio of the speed-increasing component 31 is 8. The speed of the cooling fan 2 is increased by the planetary gear 312 group, thereby improving the problem of poor heat dissipation caused by the small number of rotations of the output shaft 111 of the motor 11 during the cutting process of the electric pruning shears.

[0035] In some or other preferred embodiments, a counterweight 5 may also be provided on the cooling fan 2. The counterweight 5 has a first position and a second position. When the rotational speed of the cooling fan 2 exceeds a predetermined value, the counterweight 5 is located in the first position, and when the rotational speed of the cooling fan 2 is less than the predetermined value, the counterweight 5 is located in the second position. The counterweight may be made of a material different from that of the cooling fan 2, a material with a higher density, such as metal, specifically iron or steel, thereby increasing the centrifugal force after the cooling fan 2 rotates, so that the cooling fan 2 can still rotate under inertia after being separated from the power of the output shaft 111.

[0036] In some or other preferred embodiments, a slide 21 may be provided on the cooling fan 2. The slide 21 may be formed on the cooling fan 2 or mounted on the cooling fan 2. The slide 21 may extend radially along the cooling fan 2, with a first position located at one end of the slide 21 away from the center of the cooling fan 2, and a second position located at one end of the slide 21 closer to the center of the cooling fan 2, thereby accommodating the counterweight 5 in the slide 21 and restricting the movement trajectory of the counterweight 5.

[0037] In some or other preferred embodiments, the counterweight 5 is a ball bearing. The ball bearing reduces the friction of the counterweight 5 during sliding. A sealing member 33 can be installed at the end of the slide 21 away from the center of the cooling fan 2. The sealing member 33 can be threaded into the slide 21 or abut against the outer peripheral wall of the cooling fan 2. That is, the sealing member 33 can be a fastener threaded into the slide 21 or a bearing inner ring installed on the outer peripheral wall of the cooling fan 2.

[0038] In some or other preferred embodiments, an elastic element 22 may be installed within the slide 21. The elastic element 22 can be a compression spring, tension spring, etc., as long as it can provide elastic potential energy and has a tendency to bias the counterweight 5 towards the center of the cooling fan 2. The magnitude of the elastic force of the elastic element 22 limits a predetermined value of the rotational speed of the cooling fan 2 when the counterweight 5 slides. The elastic force of the elastic element 22 can be adjusted by those skilled in the art according to actual conditions. Specifically, in the embodiments of this application, the elastic element 22 is preferably a compression spring. One end of the elastic element 22 abuts against the sealing member 33, and the other end abuts against the counterweight 5, thereby concentrating the counterweight 5 towards the center position of the cooling fan 2 when the rotational speed of the cooling fan 2 is lower than the predetermined value, reducing the impact on the torque of the cooling fan 2.

[0039] 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 are 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.

[0040] 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 application. 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. An electric pruning shears, characterized in that, include: chassis; The motor is housed in the housing and has an output shaft; A transmission mechanism connected to the motor; A fixed bracket is connected to the transmission mechanism; A fixed blade is connected to the fixed bracket; The moving blade is rotatably connected to the fixed bracket; The controller is at least partially housed within the housing; A cooling fan is rotatably connected to the housing. The drive component drives the cooling fan to rotate.

2. The electric pruning shears according to claim 1, characterized in that, The drive assembly includes a speed-increasing component, which is connected to the cooling fan and the output shaft.

3. The electric pruning shears according to claim 2, characterized in that, The speed-increasing component includes a planetary carrier, planetary gears, a sun gear, and an internal gear ring. The internal gear ring is connected to the output shaft of the motor and meshes with the planetary gears. The planetary gears are located on one side of the planetary carrier, and the sun gear is located on the other side of the planetary carrier. The sun gear is connected to the cooling fan.

4. The electric pruning shears according to claim 3, characterized in that, The drive assembly further includes a one-way clutch mechanism located between the output shaft and the internal gear ring; and / or, it further includes a one-way limiting member disposed between the housing and the cooling fan; and / or, the speed ratio of the speed-increasing component is at least 2.

5. The electric pruning shears according to claim 4, characterized in that, When the moving blade moves away from the fixed blade, the output shaft rotates in a first direction. When the moving blade moves closer to the fixed blade, the output shaft rotates in a second direction. The one-way clutch mechanism restricts rotation in the first direction and allows rotation in the second direction. The one-way limiting member prevents the cooling fan from rotating in the second direction and allows the cooling fan to rotate in the first direction. The one-way clutch mechanism is a one-way bearing or a one-way clutch. The one-way limiting member is a pawl limiting mechanism or a one-way bearing.

6. The electric pruning shears according to claim 1, characterized in that, The cooling fan is equipped with a counterweight, which has a first position and a second position. When the speed of the cooling fan exceeds a predetermined value, the counterweight is located in the first position, and when the speed of the cooling fan is less than the predetermined value, the counterweight is located in the second position.

7. The electric pruning shears according to claim 6, characterized in that, The cooling fan is provided with a slide rail that extends radially along the cooling fan. The first position is located at the end of the slide rail away from the center of the cooling fan, and the second position is located at the end of the slide rail close to the center of the cooling fan.

8. The electric pruning shears according to claim 7, characterized in that, The counterweight is a ball bearing, and the end of the slide away from the center of the cooling fan is provided with a sealing element.

9. The electric pruning shears according to claim 8, characterized in that, An elastic element is provided inside the slide rail. One end of the elastic element is connected to the first position, and the other end is connected to the counterweight. The elastic element has a tendency to bias the counterweight toward the center of the cooling fan.

10. The electric pruning shears according to claim 1, characterized in that, The housing has a gripping part, and an air inlet is provided at one end of the gripping part near the fixed blade. The housing also has a battery connection part and an air outlet at the battery connection part.

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