Ventilation opening structure and mini-tiller

Abstract

The application discloses a ventilation opening structure and a mini-tiller, wherein the ventilation opening structure comprises a shell, a ventilation opening part, a filter and a cover plate. The ventilation opening part is arranged on the shell and communicates with an inner cavity. The filter is arranged at the ventilation opening part. The cover plate covers the outer side of the filter and is connected with the ventilation opening part. A first opening, a second opening and a third opening are formed between the cover plate and the ventilation opening part. A filter cavity is formed between the cover plate and the filter. The first opening and the third opening constitute an air inlet channel for air flow to enter the inside of the shell. The second opening is arranged at the bottom of the filter cavity and is used for discharging impurities intercepted by the filter. The structure realizes the separation of air inlet filtering and impurity discharge through a unique opening layout, has the remarkable advantages of self-cleaning and anti-clogging, and is particularly suitable for a heat dissipation system of outdoor power equipment such as the mini-tiller.

Description

Technical Field

[0001] This application relates to the field of garden tools, and in particular to a vent structure and a micro-tiller. Background Technology

[0002] Outdoor power equipment such as mini tillers typically requires ventilation openings to dissipate heat. However, dust, weeds, and other debris in the working environment can easily enter the equipment with the airflow, accumulating on critical components and affecting heat dissipation efficiency, even leading to equipment malfunction. Existing technologies often use simple filters or sponges for shielding, but these methods suffer from problems such as easy clogging, difficulty in cleaning, and unsatisfactory waterproofing and dustproofing effects. Utility Model Content

[0003] The purpose of at least one specific embodiment of this utility model is to overcome the defects of the existing technology and provide a ventilation structure and a micro-tiller.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A ventilation opening structure, comprising: case; The ventilation opening is located on the housing and communicates with the inner cavity of the housing; Filter elements are installed at the ventilation openings; A cover plate, which covers the outside of the filter element and connects to the vent; Among them, a first opening, a second opening and a third opening are formed between the cover plate and the vent, and a filter cavity is formed between the cover plate and the filter element. The first and third openings form an air intake channel for airflow into the housing, while the second opening, located at the bottom of the filter chamber, is used to discharge impurities intercepted by the filter element to the outside of the filter chamber.

[0005] Furthermore, the vent is formed in a recessed area on the side wall of the housing and defines a recessed cavity, in which the filter element is housed.

[0006] Furthermore, both the first and second openings are located at the lower edge of the connection between the cover plate and the vent.

[0007] Furthermore, a third opening is provided on the vent and maintains communication between the filter chamber and the inner cavity of the housing.

[0008] Furthermore, when the housing is in an inclined working state, the second opening is closer to the ground level than the first opening.

[0009] Furthermore, an anti-blocking flare is provided at the second opening.

[0010] Furthermore, the cover plate is fixedly installed at the ventilation opening by a snap-fit ​​method.

[0011] Furthermore, the first opening is configured as the inlet end of the filter chamber, and the third opening is configured as the outlet end of the filter chamber; the external airflow enters the filter chamber through the first opening in sequence, is filtered by the filter element, and then enters the interior of the housing through the third opening.

[0012] Furthermore, the impurities intercepted by the filter are discharged through the second opening under their own gravity.

[0013] Compared with the prior art, the beneficial effects of this application are as follows: 1. By setting an air inlet channel consisting of a first opening, a filter chamber, and a third opening, and separating it from the second opening impurity discharge channel located at the bottom of the filter chamber, this application ensures the cleanliness of the airflow entering the equipment and effectively prevents external impurities from entering.

[0014] 2. The second opening is located at the bottom of the filter chamber, which allows impurities intercepted by the filter to be automatically discharged under their own gravity, avoiding the accumulation of impurities in the filter chamber and clogging of the air inlet channel, thus significantly reducing the frequency and need of maintenance.

[0015] 3. This application integrates multiple functions such as air intake, filtration, and impurity removal into one unit. It has a simple and reasonable structure and is especially suitable for outdoor power equipment with limited space.

[0016] Another technical solution adopted in this application is to provide a micro-tiller, including the above-mentioned ventilation structure.

[0017] As can be seen from the above technical solution, the micro-tiller provided in this application, due to the configuration of the above-mentioned ventilation structure, has the corresponding technical effect of the above-mentioned ventilation structure. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the micro-tiller in the working state of this application.

[0020] Figure 2 This is a schematic diagram of the micro-tiller in this application when it is in an idle state.

[0021] Figure 3 This is a side view of the micro-tiller in operation.

[0022] Figure 4 This is a top view of the micro-tiller of this application.

[0023] Figure 5 for Figure 4 A schematic diagram of the cross section along line AA.

[0024] Figure 6 for Figure 5 Enlarged view of area B in the image.

[0025] Figure 7 This is a schematic diagram of the main structure of the micro-tiller of this application.

[0026] Figure 8 This is a side view of the main body of the micro-tiller of this application.

[0027] Figure 9 for Figure 8 A schematic diagram of the cross section along the CC line.

[0028] Figure 10 for Figure 9 Enlarged view of area D in the image.

[0029] Figure 11 This is a schematic diagram of the bottom shell structure of this application.

[0030] Figure 12 This is a top view of the main body of the micro-tiller in this application.

[0031] Figure 13 for Figure 12 A schematic diagram of the cross section along the EE line.

[0032] Figure 14 This is an exploded view of the main body of the micro-tiller in this application.

[0033] Figure 15 This is a schematic diagram of the right shell structure of the micro-tiller of this application.

[0034] Figure 16 This is an assembly diagram of the power assembly, control assembly, and battery pack assembly of this application.

[0035] Figure 17 for Figure 16 Another structural diagram from another angle.

[0036] Figure 18 This is a schematic diagram of the exploded casing of the micro-tiller in this application.

[0037] Figure 19 This is a schematic diagram of the assembly of the power component and control component of this application.

[0038] Figure 20 for Figure 19 An explosion diagram.

[0039] Figure 21 for Figure 19Another structural diagram from another angle.

[0040] Figure 22 This is a schematic diagram of the power assembly of this application.

[0041] Figure 23 This is a schematic diagram of the ventilation opening structure on the right shell of this application.

[0042] Figure 24 This is a schematic diagram of the assembly of the ventilation opening structure on the right shell of this application.

[0043] Figure 25 This is a schematic diagram of the structure of the ventilation opening on the right shell of this application.

[0044] Figure 26 This is a front view of the right shell of this application.

[0045] Figure 27 for Figure 26 A schematic diagram of the cross section along the FF line.

[0046] Figure 28 This is a front view of the connector in this application. Detailed Implementation

[0047] 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.

[0048] Reference Figures 1 to 14 A gardening tool 100 includes a power component 10, a working component 20, a control component 30, and a transmission component 40. The power component 10 is connected to the working component 20 via the transmission component 40. The power component 10, acting as a power source, is typically composed of an electric motor or an internal combustion engine, providing initial mechanical energy. This component efficiently transmits power to the working component 20 via the transmission component 40. The working component 20, designed according to its specific function, may be an actuator such as a tiller, saw chain, or brush head, responsible for performing gardening operations such as tilling, cutting, and trimming. The control component 30 integrates switches and a controller, allowing users to flexibly operate the equipment and ensuring operational safety and functionality.

[0049] In this embodiment, the garden tool 100 can be specifically implemented as a micro-tiller. The micro-tiller includes a housing 50, a handle connection structure 60 connected to one side of the housing 50, a battery pack assembly 70 (including a battery pack 701) installed inside the housing 50, and a walking assembly 80 installed at the bottom of the housing 50.

[0050] Specifically, the power assembly 10 includes a motor 101 disposed within the housing 50. The motor 101 is installed within the housing 50 and has a motor output shaft 102. Reference Figure 7 , Figure 8 , Figure 9 The working component 20 includes a rotating shaft 201, a plurality of tillage blades 202 fixed on the rotating shaft 201, a first transmission component 203 fixedly installed on the rotating shaft 201, and a second transmission component 204 meshing with the first transmission component 203. In this embodiment, the first transmission component 203 can be specifically implemented as a worm gear, and the second transmission component 204 can be specifically implemented as a worm. The first transmission component 203 and the second transmission component 204 cooperate to form a worm gear structure.

[0051] The control assembly 30 includes a controller 301 installed inside the housing 50 and a heat sink body 302 disposed on one side of the controller 301, wherein the surface of the heat sink body 302 has a plurality of heat dissipation fins 303.

[0052] The transmission assembly 40 includes a first bushing 401 fixed to the end of the motor output shaft 102, a transmission shaft 402 fixedly connected to the second transmission member 204, a second bushing 403 fixed to the end of the transmission shaft 402, and a connector 404 connecting the motor output shaft 102 and the transmission shaft 402. One end of the connector 404 is fixedly connected to the motor output shaft 102 via the first bushing 401, and the other end of the connector 404 is fixedly connected to the transmission shaft 402 via the second bushing 403. In this embodiment, the material of the connector 404 is different from the materials of the motor output shaft 102 and the transmission shaft 402. The elastic limit of the connector 404 is greater than that of the motor output shaft 102 and the transmission shaft 402. The material of the connector 404 is preferably spring steel. By using spring steel as the material of the connector 404, compared with directly using a rigid shaft connection, the vibration of the tiller 202 can be reduced from being transmitted to the main body of the machine through the transmission shaft 402, thus achieving both vibration reduction and noise reduction.

[0053] In one embodiment, the connector 404 is in the form of a multi-layered twisted rope. This elastic structure can retain a certain deformation space, which ensures both elastic performance and connection rigidity. The final shape formed after winding is roughly a cube, but it can also be a cylinder, cuboid, or other suitable shapes.

[0054] Reference Figure 28 The length H of the connector 404 is 30≤H≤100mm, preferably 50≤H≤70mm, and the width W is 5≤W≤9mm, preferably 6mm. Under these dimensions, both the shock absorption and noise reduction effect and the transmission efficiency can be guaranteed.

[0055] Specifically, the motor output shaft 102, the transmission shaft 402, and the connector 404 are fixedly connected by a first bushing 401 and a second bushing 403, respectively. One end of the first bushing 401 is connected to the motor output shaft 102 by an interference fit, and one end of the second bushing 403 is connected to the transmission shaft 402 by an interference fit. The ends of the first bushing 401 and the second bushing 403 facing the connector 404 are square inner holes. The first bushing 401 and the second bushing 403 are nested with the connector 404 through the square inner holes. It should be noted that the inner holes of the first bushing 401 and the second bushing 403 are not limited to square, but can also be other shapes of inner holes. The shape of the inner hole is determined according to the shape of both ends of the connector 404.

[0056] After the connector 404 is installed between the first bushing 401 and the second bushing 403, there is a gap between the first bushing 401 and the second bushing 403 so that they cannot make contact, thus avoiding vibration transmission due to contact.

[0057] Furthermore, the housing 50 includes a left housing 501 and a right housing 502 that are spliced ​​together, and a bottom housing 503 installed at the bottom. The left housing 501, right housing 502, and bottom housing 503 are spliced ​​together to form a sealed main body. The housing 50 has an opening, at which a flip cover 504 is fitted. One side of the flip cover 504 is connected to the left and right housings by a hinge, allowing it to be flipped open. When the flip cover 504 is open, the opening on the housing 50 provides an insertion path for the battery pack 701. The battery pack 701 can be inserted into the housing 50 through the opening for installation and locking. Unlocking and removing the battery pack 701 are also performed through this opening.

[0058] Furthermore, refer to Figure 4 , Figure 5 , Figure 6 The handrail connection structure 60 includes a handrail 601, which includes a connecting end 602, which is disposed inside the housing 50.

[0059] Specifically, the connecting end 602 on the housing 50 and the handrail 601 is provided with multiple connecting holes, and the fastener 604 (preferably a bolt) passes through the connecting holes on the housing 50 and the handrail 601 respectively, and then the connection is fixed by the locking member 605 (preferably a locking nut).

[0060] In this embodiment, an insulating element 603 is provided between the connecting end 602 and the fastener 604. The insulating element 603 is composed of a sleeve 603a and a partition 603b. The partition 603b is fixedly disposed at one end of the sleeve 603a and is integrally embedded in the connecting hole. The sleeve 603a accommodates the rod portion of the fastener 604, thereby completely isolating it from the inner wall of the connecting end 602. This effectively prevents the fastener 604 from coming into contact with the inner wall of the connecting end 602 due to loosening, eliminating the potential risk of electric shock and significantly improving the insulation reliability of the handrail connecting structure 60. Moreover, since the insulating component 603 is completely built into the housing 50, it is protected from direct exposure to harsh outdoor environments, thus effectively avoiding direct damage from external factors such as direct sunlight and ultraviolet radiation, rain erosion, drastic temperature changes, and physical impacts.

[0061] Furthermore, the two sides of the partition 603b abut against the connecting end 602 and the locking member 605 respectively, forming an insulating barrier between them, which further ensures the electrical isolation between the locking member 605 and the connecting end 602, and enhances the insulation performance and safety of the overall structure.

[0062] Specifically, in this embodiment, multiple connection holes are provided to improve the stability of the connection between the handrail 601 and the housing 50. The housing 50 is preferably made of plastic insulating material. Therefore, the insulating member 603 is mainly used to achieve the purpose of insulation between the handrail 601 and the fastener 604 and the locking member 605.

[0063] Furthermore, a limiting part 606 is provided inside the housing 50 at the mounting position corresponding to the handrail 601. A through hole is provided on the side of the housing 50 near the handrail 601 for the handrail 601 to pass through. During installation, the connecting end 602 of the handrail 601 extends into the housing 50 through the through hole and is finally securely contained in the limiting part 606. This structure not only facilitates the assembly of the handrail but also effectively enhances the stability and reliability of the connection part.

[0064] Furthermore, refer to Figures 12 to 15 The battery pack assembly 70 includes a battery pack 701 and a battery mounting plate 702 disposed within a housing 50. An mounting structure for assembling the battery mounting plate 702 is provided inside the housing 50. The mounting structure includes a limiting groove 505 extending along the inside of the housing 50 and a plug-in sleeve 506. The plug-in sleeve 506 is installed on the inner walls of the left housing 501 and the right housing 502. When the left housing 501 and the right housing 502 are spliced, the plug-in sleeve 506 is fixedly connected to the plug-in portions 703 on both sides of the battery mounting plate 702, so that the battery mounting plate 702 is fixed inside the housing 50.

[0065] The limiting grooves 505 on the left and right housings are used to accommodate the limiting side plates 704 on both sides of the battery mounting plate 702. The limiting grooves 505 limit the upper and lower movement of the battery mounting plate 702, preventing it from wobbling and improving the stability of the installation. After the battery mounting plate 702 is stably installed in the housing 50, when the flip cover 504 is opened, the opening on the housing 50 provides an insertion path for the battery pack 701. The battery pack 701 can be inserted into the housing 50 along the opening and installed and locked onto the battery mounting plate 702. The installed battery pack 701 is used to supply power to the motor 101.

[0066] The housing 50 and battery mounting plate 702 directly form a battery receiving cavity, which is used to house and install the battery pack 701. Inside the housing, there is no cavity specifically designed to cover the battery pack 701 based on its shape or size; the upper part of the housing 50 directly houses the battery pack 701. When the battery pack 701 is installed in the battery receiving cavity, the distance between the battery pack 701 and the inner wall of the housing 50 is relatively large. This avoids heat accumulation in the cavity surrounding the battery pack 701, facilitating airflow within the cavity and promoting heat dissipation from the battery pack 701. Furthermore, when the machine is exposed to sunlight outdoors, the temperature of the housing is not rapidly and extensively conducted to the battery pack 701, reducing the temperature rise of the battery pack 701.

[0067] Furthermore, the walking assembly 80 includes a support arm 801 connected to the handle 601 and rollers 802 mounted on the end of the support arm 801. The support arm 801 can be designed to have two states: an extended state and a retracted state. When the support arm 801 is in the extended state, the rollers 802 are in operation, and the entire garden tool 100 is supported on the ground 200 by the rollers 802 during this period. At this time, the tiller 202 of the working assembly 20 faces the ground, and the operator can push the garden tool 100 forward along the ground 200 by holding the handle 601. During this process, the tiller 202 tills the ground.

[0068] When the garden tool 100 (tiller) of this application is not in use, the support arm 801 can be rotated to a state parallel to the handle 601, and the entire tiller can be laid flat on the ground.

[0069] Reference Figure 3When the mini tiller is working, the support arm 801 can rotate to form a certain angle with the handle 601 and be fixed. After the support arm 801 is extended, the overall shape of the mini tiller needs to be adjusted so that the roller 802 and the tiller blade 202 at the end of the support arm 801 are in contact with the ground 200. The central axis of the machine body is set as X. When the mini tiller is in working condition, the tilt angle formed by its central axis X and the horizontal line of the ground 200 is α, where the tilt angle is 0 < α < 90 degrees, preferably 45-60 degrees. In this embodiment, the central axis X can also be the axis of the motor output shaft 102; or it can be the axis of the transmission shaft 402, that is, the transmission axis formed by the motor output shaft and the worm shaft. Of course, for some machines, the central axis X of the machine body is perpendicular to the horizontal line of the ground 200, such as lawnmowers and snowplows.

[0070] The following is a detailed explanation of the specific working process of Garden Tool 100 (micro-tiller).

[0071] After the motor 101 starts, its output shaft 102 begins to rotate, converting electrical energy (provided by the battery pack 701) into mechanical energy, providing initial power to the entire machine. This power is efficiently transmitted through the transmission assembly 40. The transmission process begins with the first bushing 401 fixed to the end of the motor output shaft 102, and then passes through the multi-layered, spiral-shaped connector 404 made of spring steel to the transmission shaft 402, which is fixedly connected to the second transmission component 204 (worm gear). The other end of the transmission shaft 402 is fixed to the connector 404 via the second bushing 403. This unique elastic connection design effectively absorbs vibration and impact during operation, resulting in significant shock absorption and noise reduction.

[0072] The power ultimately drives the working component 20 through a worm gear mechanism. The rotation of the transmission shaft 402 drives the second transmission component 204 (worm), which meshes with the first transmission component 203 (worm wheel), thereby driving the rotating shaft 201 and the multiple tillage blades 202 fixed on it to rotate at high speed, cutting and turning the soil to complete the core tillage operation. The control component 30 is responsible for the operation management and maintenance of the entire machine. Its controller 301 receives user commands to adjust the speed and power of the motor 101.

[0073] The movement and working posture of the entire machine are adjusted by the walking assembly 80. During operation, the support arm 801 unfolds, allowing the rollers 802 and the tiller blades 202 to contact the ground 200 together. At this time, the central axis X of the entire machine forms an angle α with the ground, preferably 45-60 degrees. The user can move the machine forward and operate continuously by pushing the handle 601. The handle 601 is connected to the housing 50 through its connecting end 602. The insulating component 603, consisting of a sleeve 603a and a partition 603b, along with the fastener 604 and locking component 605, together ensure the safe isolation of the operator from the electrical components, greatly improving operational safety. Specifically, the sleeve 603a is directly fitted onto the metal rod of the fastener 604 for fastening. Its core function is to ensure that the metal surface of the fastener 604 never directly contacts the inner wall of the metal connecting end 602 of the handle 601 under any circumstances. Even if the fastener 604 loosens after long-term vibration, the sleeve 603a can continue to effectively isolate the two, thereby fundamentally cutting off the potential conductive path formed through the fastener itself.

[0074] Meanwhile, partition 603b is fixedly installed at one end of sleeve 603a, located between the connecting end 602 of handrail 601 and the locking member 605 for securing. When the entire connection structure is tightened, the two sides of partition 603b maintain firm contact with the connecting end 602 and the locking member 605, respectively. This forms an independent electrical isolation layer, effectively blocking another leakage risk path that could occur through contact between the locking member 605 and the connecting end 602. Insulator 603 successfully constructs a complete and robust safety protection zone between the metal handrail 601 and the internal electrical components that may carry dangerous voltages. This design ensures that the operator is effectively protected even if an electrical fault occurs inside the equipment while holding the handrail 601, achieving reliable safety isolation between the operator and live parts.

[0075] When the machine is not in use, the support arm 801 can be folded down to be parallel to the handle 601, so that the micro-tiller can be laid flat on the ground, saving storage space.

[0076] Furthermore, refer to Figure 3 , Figure 7 , Figure 13 The overall design integrates a system thermal management and vibration suppression scheme to ensure working performance and reliability. In other words, the garden tool 100 (micro-tiller) of this application has an overall heat dissipation system 300 and a shock absorption structure 400.

[0077] Specifically, the overall heat dissipation system 300 includes heat dissipation channels, which sequentially dissipate heat from the battery pack 701, controller 301, and motor 101.

[0078] Specifically, the heat dissipation channels include a first heat dissipation channel 310, a second heat dissipation channel 320, and a third heat dissipation channel 330.

[0079] The first heat dissipation channel 310 is located in the upper part of the main body and mainly dissipates heat from the battery pack 701. The second heat dissipation channel 320 connects the first heat dissipation channel 310 and the third heat dissipation channel 330. The third heat dissipation channel 330 dissipates heat from the controller 301 and the motor 101 and exhausts the heat dissipation airflow from inside the main body.

[0080] The first heat dissipation channel 310 is the initial cooling area designed for the battery pack 701. The first heat dissipation channel 310 is an open battery housing cavity directly surrounded by the housing 50 and the battery mounting plate 702. Its core function is to allow the cooling airflow drawn in from the outside to flow through and surround the battery pack 701 first, and directly carry away the heat generated inside the battery pack 701 during operation through the battery pack air inlet 701a and the battery pack air outlet 701b on the battery pack.

[0081] Furthermore, the second heat dissipation channel 320 connects the upper and lower parts of the main body. The second heat dissipation channel 320 mainly guides the cooling airflow of the first heat dissipation channel 310 to the third heat dissipation channel 330, that is, guides the cooling airflow from the upper part of the main body to the lower part. The upper part of the main body mainly refers to the area inside the housing 50 near the battery pack assembly 70, and the lower part of the main body mainly refers to the area inside the housing 50 near the control assembly 30 and the power assembly 10.

[0082] The second heat dissipation channel 320 is mainly composed of a battery mounting plate 702 and a housing 50. In this embodiment, the housing 50 is basically square in shape and includes a front side 50a, a rear side 50b, an upper side 50c, and a lower side 50d. The front side 50a and the rear side 50b are opposite each other, and the upper side 50c and the lower side 50d are opposite each other vertically. The side of the rear side 50b closest to the armrest 601 forms the shaded side. The shaded side is defined as follows: when the garden tool is in a working posture, that is, when the central axis X of its housing 50 forms an inclined angle α with the horizontal line of the ground, assuming that the sunlight shines approximately vertically from above, the outer surface of the housing 50 that is continuously in the shaded area due to the machine's own structure and can effectively avoid direct sunlight is defined as the shaded side. In this embodiment, the shaded side specifically refers to the rear side 50b of the housing 50 closest to the armrest 601.

[0083] After the battery mounting plate 702 is installed inside the housing 50, the side of the battery pack 701, the side of the battery mounting plate 702, and the rear side 50b form a second heat dissipation channel 320. The battery pack 701 has a battery pack air inlet 701a and a battery pack air outlet 701b, with the battery pack air outlet 701b located close to the second heat dissipation channel 320.

[0084] Since the second heat dissipation channel 320 is close to the rear side 50b of the housing 50, some of the heat from the airflow in the second heat dissipation channel 320 can be conducted through the housing 50, thereby allowing the cooling airflow to be properly cooled and cooled, so as to better cool and dissipate heat from the controller 301 and the motor 101 in the future, and improve the heat dissipation effect.

[0085] In actual operation, when the machine's rollers 802 and blades 202 contact the ground 200, the entire machine body is tilted and not perpendicular to the horizontal line of the ground. This means that the rear side 50b of the housing 50, near the handle 601, is not directly exposed to sunlight (it will be in some shade when working outdoors), and the temperature of this part of the housing (rear side 50b) is relatively lower than that of other parts of the housing. Therefore, placing the second heat dissipation channel 320 near the handle 601 is more conducive to properly cooling the airflow. The third heat dissipation channel 330 is located in the lower part of the main body and mainly dissipates heat from the controller 301 and the motor 101.

[0086] Furthermore, refer to Figures 19 to 22 The power assembly 10 inside the housing 50 also includes a first cover 103 and a second cover 104. After the first cover 103 and the second cover 104 are fixedly connected, they form a relatively closed wind-gathering cover 107. The fan 105 at the tail of the motor 101 and the motor 101 are both housed in the wind-gathering cover. A mounting cavity 106 is also provided on one side of the second cover 104. The controller 301 and the radiator body 302 are housed in the mounting cavity 106. In specific installation, the controller 301 can be fixed to one side of the radiator body 302, and the radiator body 302 can be snapped into the mounting cavity 106. The heat dissipation fins 303 on the back of the radiator body 302 face the mounting cavity 106.

[0087] Multiple openings are provided around the mounting cavity 106. In addition, one end of the air inlet 107a is the air inlet 107a, and the other end is the air outlet 107b. Specifically, the air inlet 107a is located at the bottom of the air inlet 107, and the air outlet 107b is located at the top of the air inlet 107. The cooling airflow sweeps over the surface of the controller 301 and passes through the heat dissipation fins 303 before entering the air inlet 107a of the air inlet 107 through the opening. Since the air inlet 107a is located at the lower end of the motor 101, and the air outlet 107b is located on one side of the fan 105, which is located at the rear of the motor 101, when the cooling airflow enters from the air inlet 107a, it must first pass through the main body of the motor 101 before flowing out through the air outlet 107b, which facilitates the cooling airflow to dissipate heat from the entire motor 101.

[0088] Furthermore, refer to Figure 16 , Figure 17 , Figure 18 To facilitate the entry of cooling airflow into the housing 50 and the smooth exit of the circulated cooling airflow from the housing 50, airflow inlets 500 and airflow outlets 600 are provided on both sides of the housing 50. The airflow outlet 600 corresponds to the position of the air outlet 107b, and the airflow exiting from the air outlet 107b can be directly exited to the outside of the housing 50 through the airflow outlet 600. To facilitate the filtration of the cooling airflow entering the housing 500 at the airflow inlet 500, a vent structure 700 (with filtration function) is provided at the airflow inlet 500.

[0089] Specifically, refer to Figures 23 to 27 The ventilation structure 700 includes a ventilation opening 710 disposed on the side of the housing 50, a filter element 720 disposed at the ventilation opening 710, and a cover plate 730 covering the outside of the filter element 720. The filter element 720 is preferably made of sponge. The ventilation opening 710 is recessed in the housing 50, maintaining communication between the inner cavity of the housing 50 and the outside. The filter element 720 is placed within the recessed cavity of the ventilation opening 710. The cover plate 730 is fastened to the ventilation opening 710 and located outside the filter element 720. Afterwards, there is a gap between its edge and the inner wall of the vent 710, and there is also a gap between the inner side of the cover plate 730 and the surface of the filter element 720. After the cover plate 730 is installed, a first opening 740, a second opening 750 and a third opening 760 will be formed at the vent 710. The gap between the cover plate 730 and the filter element 720 forms a filter chamber 770. The first opening 740 and the third opening 760 constitute a first channel for air intake, and the first opening 740 and the second opening 750 constitute a second channel for impurity discharge.

[0090] Specifically, the first opening 740 and the second opening 750 are mainly located on the lower side of the connection between the cover plate 730 and the vent 710 (the cover plate 730 and the housing 50 have a gap at the first opening 740 for ventilation), which can prevent rainwater from entering the vent 710. When the cooling airflow passes through the first opening 740, the filter element 720 (sponge) can filter sand, gravel, debris, etc. Because the main body of the machine is set in an inclined state, when sand, gravel, debris, dust, etc. that are not filtered out by the first opening 740 enter the filter chamber 770, they will be intercepted by the filter element 720. Since the second opening 750 is located at the bottom of the filter chamber 770, the intercepted sand, gravel, dust, and other impurities can be smoothly discharged from the second opening 750 under their own gravity.

[0091] Furthermore, a third opening 760 is provided on the vent 710 to facilitate the entry of cooling airflow into the interior of the housing 50. The third opening 760 is also located on the side away from the battery pack outlet 701b, thereby extending the flow path of the entire cooling airflow.

[0092] It should be noted that both the first opening 740 and the third opening 760 are equipped with filters 720 for filtration. Depending on the state of the main body of the machine and the position of the ventilation structure 700, this forms multiple filtration lines, which can better prevent impurities from entering the machine housing 50. Furthermore, multiple openings share a single sponge (filter 720), making installation more convenient. In addition, to prevent the filter 720 from blocking the second opening 750, a notch is provided on the housing 50 corresponding to the second opening 750. This notch is constructed as an anti-clogging flare.

[0093] In one embodiment, the machine body does not need to be set in an inclined state; simply having the second opening 750 facing the ground can also achieve the effect of discharging impurities.

[0094] Furthermore, refer to Figures 8 to 11 The shock-absorbing structure 400 includes the aforementioned transmission assembly 40, and also includes a baffle 410 and a transmission housing 420 disposed below the bottom shell 503, wherein the baffle 410 is fixed between the bottom shell 503 and the transmission housing 420.

[0095] The output end of the motor 101 is fitted with a limiting member 430. The upper end of the limiting member 430 is provided with an annular groove 440. The output end of the motor 101 is provided with a protrusion 450, which is accommodated in the annular groove 440. The protrusion 450 abuts against the outer wall of the groove 440. The lower end of the limiting member 430 is provided with an annular boss 460. The inner wall of the upper end of the transmission housing 420 abuts against the outer wall of the annular boss 460.

[0096] The upper and lower limits of the motor 101 and the transmission housing 420 by the limiting component 430 ensure the concentricity between the motor output shaft 102 and the transmission shaft 402. This avoids excessive installation errors during installation or excessive vibration during operation, which could cause excessive concentricity deviation and affect the transmission efficiency between the motor 101 and the transmission housing 420. Furthermore, since the motor output shaft 102 and the transmission shaft 402 are connected by the connector 404, the concentricity ensures the stability of the connection between the connector 404 and the motor output shaft 102 and the transmission shaft 402.

[0097] In this embodiment, the limiting member 430 is contained between the bottom shell 503 and the transmission housing 420. The bottom shell 503 has a receiving cavity 470, and a limiting ring 480 is circumferentially arranged on the upper end face of the receiving cavity 470. The limiting ring 480 cooperates with the upper end face of the transmission housing 420 to limit the upper and lower movement of the limiting member 430, preventing displacement. Furthermore, multiple ribs 490 are circumferentially arranged on the inner wall of the receiving cavity 470, and the ribs 490 abut against the outer wall of the limiting member 430, making it difficult for the limiting member 430 to detach from the receiving cavity 470 during installation, thus facilitating assembly.

[0098] In summary, the vibration damping structure 400 is a comprehensive solution integrating transmission system optimization and mechanical limit design. Its core function is to significantly improve the stability, durability, and operational comfort of the entire machine. This structure first efficiently absorbs and buffers the severe vibrations and impacts generated by the working components 20 (such as the tiller blades 202) during operation through the key elastic element (a multi-layered, twisted connector 404 made of spring steel) in its transmission assembly 40. This flexible power transmission method, compared to traditional rigid shaft connections, greatly suppresses the transmission of vibration to the main body through the transmission shaft 402, thereby directly reducing the noise level of the entire machine during operation and achieving effective vibration damping and noise reduction.

[0099] To further ensure that vibration suppression does not affect the accuracy and efficiency of power transmission, the vibration damping structure 400 also includes a precision mechanical limiting system. A dedicated limiting component 430 precisely engages with the protrusion 450 at the output end of the motor 101 via its upper annular groove 440, while its lower annular boss 460 tightly abuts against the inner wall of the transmission housing 420, thereby achieving strict vertical and radial limiting of the motor 101 and the transmission housing 420. This design ensures that the motor output shaft 102 and the transmission shaft 402 always maintain a very high degree of concentricity, effectively avoiding eccentricity problems caused by installation errors or long-term operational vibration, ensuring smooth and efficient power transmission, and protecting the elastic connector 404 from premature fatigue damage due to eccentric forces.

[0100] Furthermore, the limiting member 430 is securely housed within a specific cavity (accommodating cavity 470) of the bottom shell 503. The limiting ring 480 on the upper surface of the accommodating cavity 470, together with the multiple circumferentially arranged ribs 490 on its inner wall, works to prevent any displacement or dislodgement of the limiting member 430 during operation, greatly enhancing the structural rigidity and reliability of the entire transmission assembly. The vibration damping structure 400, through the synergistic effect of the elastic connector 404 and the mechanical limiting member 430, not only ensures the stability and efficiency of the transmission system and extends the service life of the entire machine, but also provides users with a quieter, smoother, and less vibration-affected operating experience.

[0101] During operation, the garden tool 100 (micro-tiller) not only involves mechanized tillage operations such as cutting and turning the soil, but its own cooling system 300 also dissipates heat from the battery pack 701 during operation. The specific heat dissipation process is as follows: Since the flip cover 504 is rotatably mounted above the battery housing cavity, after the motor 101 is started, the fan 105 at the tail of the motor 101 will also rotate synchronously. When the fan 105 rotates, a power source for the flow of cooling air will be formed along the entire heat dissipation path of the whole machine heat dissipation system 300. When the cooling air flows, part of the cooling air enters the battery housing cavity through the gap between the flip cover 504 and the housing 50, and the other part of the cooling air enters the battery housing cavity through the ventilation structure 700 on the housing 50.

[0102] Specifically, the cooling airflow is powered by the negative pressure suction generated when the fan 105 at the tail of the motor 101 rotates. This suction drives the outside cooling air into the housing 50 through two inlets: the main inlet is the ventilation structure 700 located on both sides of the housing 50; the auxiliary inlet is the assembly gap between the flip cover 504 and the housing 50.

[0103] The vent structure 700 is a key component for air intake and filtration. Its working process is as follows: External air first enters through the first opening 740 formed between the cover plate 730 and the vent 710, impacting the sponge filter element 720 for initial filtration. After most sand and gravel debris is blocked, the clean airflow mainly passes through the filter element 720 and enters the battery housing cavity through the third opening 760 provided on the vent 710. Fine dust and other impurities that are not completely blocked by the first opening 740, if carried by the airflow into the filter chamber 770 formed by the cover plate 730 and the filter element 720, will be automatically discharged outside the machine through the second opening 750, which is specially set near the bottom, due to their own gravity, achieving a self-cleaning effect of "air intake without dust entry".

[0104] The drawn-in cooling airflow first converges within the open battery housing cavity directly enclosed by the housing 50 and the battery mounting plate 702. The airflow enters the battery pack 701 through the battery pack inlet 701a and then exits through the battery pack outlet 701b, directly carrying away the heat generated by the battery pack 701 through convection heat transfer. This area constitutes the first heat dissipation channel 310. After cooling the battery pack 701, the rising airflow is guided to the second heat dissipation channel 320. This channel is formed by the side of the battery pack 701 (near its battery pack outlet 701b), the side of the battery mounting plate 702, and the rear side 50b of the housing. This design cleverly utilizes the machine's tilt angle during operation: the rear side 50b is typically in shadow and has a lower temperature. The hot airflow flowing through this channel can exchange heat with the housing 50, achieving initial cooling and preparing for subsequent heat dissipation.

[0105] The pre-cooled airflow then flows downwards into the third heat dissipation channel 330, cooling the controller 301 and its heat sink body 302 (with heat dissipation fins 303). After carrying away the heat, the airflow enters the interior of the concentrator shroud 107 (formed by a fixed connection between the first housing 103 and the second housing 104) through the air inlet 107a at the bottom. Under the suction of the fan 105, the airflow is forced to flow over the motor 101, efficiently dissipating its heat, and finally becomes hot air that is blown out from the air outlet 107b at the top of the concentrator shroud 107, and discharged outside the machine through the air outlet 600 on the outer wall of the housing corresponding to the position of the air outlet 107b, thus completing the entire heat dissipation cycle.

[0106] Therefore, the battery pack 701 cooling system of this mini-tiller is a forced air cooling system driven by fan 105, with multi-channel (310, 320, 330) coordination, including precision filtration and pre-cooling effects, which ensures the durability and stability of the core power source under harsh working conditions.

[0107] In summary, the garden tool 100 (micro-tiller) of this application is a device integrating power transmission, operation execution, intelligent control, heat dissipation management, and vibration suppression. Its workflow begins with the user issuing a command through the control component 30. Upon receiving the signal, the controller 301 starts the motor 101 in the power component 10. The motor 101 converts the electrical energy provided by the battery pack 701 into mechanical energy, which is then output through its rotating motor output shaft 102. This power is then efficiently transmitted through the transmission component 40. The transmission process begins with the first bushing 401 fixed to the end of the motor output shaft 102, and passes through a multi-layered, spiral-shaped connector 404 made of spring steel (its length H is preferably 50-70mm, and its width W is preferably 6mm), to the second... The transmission shaft 402 is fixedly connected to the transmission component 204 (worm gear). The other end of the transmission shaft 402 is fixed to the connecting component 404 through the second bushing 403. This unique elastic connection design can effectively absorb vibration and impact during operation, playing a significant role in shock absorption and noise reduction. The power is finally changed through the worm gear mechanism formed by the meshing of the first transmission component 203 (worm wheel) and the second transmission component 204 (worm gear), which increases the torque and drives the rotating shaft 201 in the working component 20 and the multiple tillage blades 202 fixed on it to rotate at high speed, cutting and turning the soil to complete the core tillage operation. At the same time, the movement and working posture of the whole machine are adjusted by the walking component 80. During operation, the support arm 801 is extended to form a certain angle (preferably 45-60 degrees) with the handle 601 and fixed, so that the roller 802 and the tillage blades 202 contact the ground 200 together. The user can push the handle 601 to make the machine move forward in a forward tilted posture (the central axis X of the whole machine forms an angle α with the horizontal line of the ground) and work continuously. To ensure operational safety, the handrail 601 is connected to the housing 50 through its connecting end 602. An insulating component 603 consisting of a sleeve 603a and a partition 603b is provided between them to ensure safe isolation between the operator and the internal electrical components (the principle of safety isolation has been described in detail above and will not be repeated here). Throughout the entire operation, the integrated heat dissipation system 300 continuously operates to ensure the reliability of each heat source component: the fan 105 at the tail of the motor 101 rotates to generate negative pressure suction, driving external cooling airflow into the vent structures 700 on both sides of the housing 50 and the gap between the flip cover 504 and the housing 50; the airflow first flows through the battery housing cavity where the battery pack 701 is located, enters the first heat dissipation channel 310 to directly cool it, and is then guided to the second heat dissipation channel 320 formed by the side of the battery pack 701, the side of the battery mounting plate 702 and the rear side 50b of the housing for preliminary cooling, and finally the airflow flows downward through the third heat dissipation channel 330 to dissipate heat from the controller 301 and the heat sink body 302 (with heat dissipation fins 303), and the motor 101 is forced to be cooled by the air shroud 107 (air inlet 107a and air outlet 107b), and finally the hot airflow is discharged from the air outlet 600, forming a complete airflow cycle.Furthermore, the shock-absorbing structure 400 works in concert to effectively suppress the transmission of working vibrations to the machine body and improve operating comfort. At the same time, it ensures the concentricity between the motor output shaft 102 and the transmission shaft 402 through mechanical limiting, ensuring smooth and efficient power transmission. When not in use, the support arm 801 can be folded down to be parallel to the handle 601, allowing the tiller to be placed flat on the ground.

[0108] This mini-tiller achieves comprehensive performance in terms of efficient tillage, safe operation, effective heat dissipation, and low vibration through the precise coordination of its various components (power assembly 10, working assembly 20, control assembly 30, transmission assembly 40, housing 50, handlebar connection structure 60, battery pack assembly 70, walking assembly 80, overall heat dissipation system 300, and shock absorption structure 400).

[0109] 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 vent structure, characterized by, include: case; A ventilation opening is provided on the housing and communicates with the inner cavity of the housing; A filter element is installed at the ventilation opening; A cover plate that covers the outside of the filter element and is connected to the vent. The cover plate and the vent have a first opening, a second opening and a third opening, and the cover plate and the filter element form a filter cavity. The first opening and the third opening form an air intake channel for airflow to enter the interior of the housing, and the second opening is located at the bottom of the filter chamber to discharge impurities intercepted by the filter element to the outside of the filter chamber.

2. The vent structure of claim 1, wherein, The vent is formed in a recessed area on the side wall of the housing and defines a recessed cavity, in which the filter element is housed.

3. The vent structure of claim 1, wherein, Both the first opening and the second opening are located at the lower edge of the connection between the cover plate and the vent.

4. The vent structure of claim 1, wherein, The third opening is located on the vent and keeps the filter chamber in communication with the inner cavity of the housing.

5. The vent structure of claim 1, wherein, When the housing is in an inclined working state, the second opening is closer to the ground level than the first opening.

6. The vent structure of claim 1, wherein, The second opening is equipped with an anti-blocking flare.

7. The vent structure of claim 1, wherein, The cover plate is fixedly installed at the vent by a snap-fit ​​method.

8. The ventilation opening structure according to claim 1, characterized in that, The first opening is configured as the inlet end of the filter chamber, and the third opening is configured as the outlet end of the filter chamber; external airflow enters the filter chamber sequentially through the first opening, is filtered by the filter element, and then enters the interior of the housing through the third opening.

9. The vent structure of claim 1, wherein, Impurities intercepted by the filter are discharged through the second opening under their own gravity.

10. A mini-tiller characterized by, The ventilation structure includes any one of claims 1-9.

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