Lawn mower

Abstract

The application provides a mower, comprising a main body and a power head mounted on the main body, wherein the main body comprises a mounting shell with a mounting groove, the power head comprises a motor assembly accommodated in the mounting groove and a shell assembly covering the motor assembly, the motor assembly comprises a motor base assembled with the mounting shell and a motor fixed on the motor base, the bottom of the motor base is closed, the side edge of the motor base is provided with an air outlet and a waterproof rib protruding from the air outlet to partially cover the air outlet, and the mounting bottom surface of the shell assembly corresponding to the air outlet is arranged in an up-down staggered manner with the waterproof rib. Compared with the prior art, the mower provided by the application has better waterproof performance.

Description

Technical Field

[0001] This invention relates to a lawnmower, belonging to the field of garden tool technology. Background Technology

[0002] Lawn mowers are currently the most common gardening tool for household lawn cleaning. After a period of use, lawn mowers accumulate grass clippings, dust, and other dirt that are difficult to clean. Operators typically use tap water or other high-pressure water jets to clean the lawn mower. At this point, the lawn mower's waterproof performance becomes particularly important, ensuring that it is not damaged by excessive water intake.

[0003] After using the machine, it is generally necessary to rotate the machine 90° and use a high-pressure water gun to rinse the bottom cavity. Most lawnmowers on the market usually have an air vent designed below the power head to dissipate the heat generated during motor operation into the air. However, this design requires users to give up the need to use a high-pressure water gun to clean the bottom cavity.

[0004] In view of this, it is indeed necessary to improve the waterproof structure of existing lawnmowers to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a lawnmower with good waterproof performance.

[0006] To achieve the above objectives, the present invention provides a lawnmower, including a main body and a power head mounted on the main body. The main body includes a mounting shell with a recessed mounting groove. The power head includes a motor assembly housed in the mounting groove and a housing assembly covering the motor assembly. The motor assembly includes a motor base assembled with the mounting shell and a motor fixed on the motor base. The bottom of the motor base is closed, and an air outlet is provided on the side, along with a waterproof rib protruding from the air outlet for partial coverage. The mounting bottom surface of the housing assembly corresponding to the air outlet is vertically offset from the waterproof rib.

[0007] As a further improvement of the present invention, the mounting shell is further recessed with an annular groove, the annular groove being formed on the periphery of the mounting groove and the recess depth of the annular groove being greater than the recess depth of the mounting groove, and a water leakage hole being provided in the annular groove, the water leakage hole communicating with the outside.

[0008] As a further improvement of the present invention, the motor assembly further includes a fan disposed on the top of the motor, and a guide rib is provided at the air outlet. The guide rib is deflected so that the airflow direction at the air outlet is consistent with the rotation direction of the fan. A waterproof rib is formed between two adjacent guide ribs, and a first downward slope is provided on the side of the waterproof rib away from the annular groove, and a second upward slope is provided on the side of the waterproof rib close to the annular groove, so as to guide the airflow out from the air outlet.

[0009] As a further improvement of the present invention, the bottom of the motor base is recessed with a groove, the groove is located below the motor, and the end of the groove near the air outlet is provided with an opening, the opening communicating with the outside to drain the water in the groove.

[0010] As a further improvement of the present invention, an annular groove is provided at the bottom center of the motor base, the motor is located above the annular groove, and the power head also includes a wool felt that is contained in the annular groove. The wool felt is used to connect the motor and the annular groove and seal the gap between the motor and the annular groove.

[0011] As a further improvement of the present invention, a through hole for the motor shaft of the motor is provided at the middle position of the bottom of the motor base. The annular groove is provided on the outside of the through hole, and there are four grooves, which are evenly distributed around the annular groove.

[0012] As a further improvement of the present invention, the housing assembly includes a first cover and a second cover that are assembled and fitted with the motor base. The first cover and the second cover are assembled and fixed to each other. The first cover is provided with a protruding rib, and the second cover is provided with a corresponding recessed receiving groove. The protruding rib is received in the receiving groove to seal the installation gap between the first cover and the second cover.

[0013] As a further improvement of the present invention, the first cover and the second cover are respectively provided with an air inlet and an air inlet cavity. The air inlet is inclined to the rear and downward. The air inlet cavity includes a first ramp arranged near the air inlet and a second ramp arranged away from the air inlet. The first ramp slopes down towards the air inlet, and the second ramp slopes up towards the air inlet.

[0014] As a further improvement of the present invention, the first cover is provided with a first water-blocking extension, the second cover is provided with a second water-blocking extension, and the first water-blocking extension and the second water-blocking extension are connected to each other.

[0015] As a further improvement of the present invention, the housing assembly further includes an upper cover covering the first cover and the second cover, and a flip cover that can be flipped relative to the upper cover. A third water-blocking extension is provided at the position where the upper cover connects with the flip cover to seal the gap between the upper cover and the flip cover.

[0016] The beneficial effects of the present invention are as follows: On the one hand, by setting the motor base to be closed at the bottom and having an air outlet on the side, the lawnmower of the present invention can prevent water from entering the motor base through the air outlet when cleaning the bottom of the lawnmower; on the other hand, by setting a waterproof rib to partially block the air outlet, and setting the mounting bottom surface of the housing assembly corresponding to the air outlet to be vertically offset from the waterproof rib, water can be further prevented from entering the motor base from the air outlet, thus enhancing the waterproof performance of the lawnmower of the present invention. Attached Figure Description

[0017] Figure 1 This is a perspective view of the lawnmower of the present invention.

[0018] Figure 2 yes Figure 1 A three-dimensional view of the housing being installed.

[0019] Figure 3 yes Figure 1 A 3D view of the power head.

[0020] Figure 4 yes Figure 3 An exploded view of the power head is shown.

[0021] Figure 5 yes Figure 4 Exploded view of the motor assembly.

[0022] Figure 6 yes Figure 5 A 3D view of the motor base.

[0023] Figure 7 yes Figure 1 The diagram shows a cross-sectional view of the lawnmower.

[0024] Figure 8 yes Figure 7 A magnified view of the circled area.

[0025] Figure 9 yes Figure 4 A three-dimensional view of the first casing.

[0026] Figure 10 yes Figure 4 A three-dimensional view of the second casing.

[0027] Figure 11 yes Figure 4 A three-dimensional view of the upper and middle cover.

[0028] Figure 12 This is a 3D view of the assembled housing components. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown, the present invention discloses a lawnmower 100, including a main body 1, a push rod 2 extending rearward from the rear of the main body 1, a power head 3 mounted on the main body 1, a traveling wheel 5 located at the bottom of the main body 1, and a grass collection bag 6 located at the rear of the main body 1 for collecting grass clippings. Since the structures of the push rod 2, the traveling wheel 5, and the grass collection bag 6 are all existing structures, they will not be described in detail here. The following description will mainly describe in detail the specific structure of the power head 3 and the connection relationship between the power head 3 and the main body 1.

[0031] like Figure 2 As shown, the main body 1 includes a mounting shell 10 with a recessed mounting groove 11. The mounting groove 11 is formed by a downward indentation from the middle of the mounting shell 10 and is approximately annular. A receiving hole 111 is provided on the bottom wall 110 of the mounting groove 11, so that screws can pass through the receiving hole 111 to assemble and fix the bottom of the power head 3 to the bottom wall 110 of the mounting groove 11.

[0032] The mounting housing 10 also has a recessed annular groove 12. The annular groove 12 is formed on the periphery of the mounting groove 11, and the recessed depth of the annular groove 12 is greater than the recessed depth of the mounting groove 11, so as to create a height difference between the mounting groove 11 and the annular groove 12. A drainage hole 121 is provided in the annular groove 12, which communicates with the outside. So that when the lawnmower 100 is used in rainy weather or in humid areas, the rainwater on the power head 3 will slide into the annular groove 12 and eventually flow out from the drainage hole 121, thus realizing the smooth drainage of water accumulated in the mounting housing 10.

[0033] In this embodiment, four receiving holes 111 are provided to stably install the power head 3 inside the mounting shell 10; five drainage holes 121 are provided and evenly distributed in the annular groove 12 to divert the water accumulated in the annular groove 12 and ensure that all the water in the annular groove 12 is discharged.

[0034] The power head 3, as a replaceable component, can replace a small internal combustion engine and can be applied to various devices, such as outdoor power equipment including lawnmowers, snowplows, washers, and soil conditioners. This invention will use a lawnmower as an example to describe the specific structure and function of the power head 3 in detail, but should not be considered as a limitation.

[0035] like Figures 3 to 8 and combined Figure 2 As shown, the power head 3 includes a motor assembly 30 housed in the mounting slot 11, an energy device (not shown), and a housing assembly 40 covering the motor assembly 30 and the energy device. The housing assembly 40 has an air inlet 41 and an air outlet 311, and also has an air inlet cavity 42 connected to the air inlet 41. The motor assembly 30 includes a motor base 31 assembled with the mounting housing 10, a motor 32 fixed on the motor base 31, a fan 33 located on top of the motor 32, and a wind-concentrating shroud 34 covering the outside of the motor 32 and the fan 33.

[0036] The bottom of the motor base 31 is closed, and the side is provided with an air outlet 311 that communicates with the outside and a waterproof rib 312 that protrudes from the air outlet 311 to partially block it. The setting of the waterproof rib 312 makes the motor base 31 and the housing assembly 40 staggered vertically, that is, the mounting bottom surface of the housing assembly 40 corresponding to the air outlet 311 is lower than the upper surface of the waterproof rib 312, thereby preventing rainwater from splashing into the air outlet 311 and entering the motor 32.

[0037] Furthermore, the upper surface of the annular groove 12 is lower than the upper surface of the waterproof rib 312, which can prevent water from entering the motor base 31 from the air outlet 311. Specifically, the bottom of the motor base 31 is locked to the bottom wall 110 of the mounting groove 11 by screws passing through the receiving hole 111. The annular groove 12 is distributed around the periphery of the motor base 31. In other words, the motor base 31 does not block the annular groove 12, so rainwater flowing down from the top of the power head 3 will flow along the housing assembly 40 of the power head 3 into the annular groove 12 and finally be discharged from the drain hole 121 in the annular groove 12.

[0038] It should be noted that air outlets 311 can be provided around the bottom side of the motor base 31, meaning at least two air outlets 311 can be provided. In this embodiment of the invention, three air outlets 311 are provided to allow air to be discharged in three directions. Because the air outlets 311 are located close to the bottom of the motor base 31, and the waterproof ribs 312 are vertically offset from the housing assembly 40 and have a certain height, rainwater will not splash into the air outlets 311. At the same time, water accumulated in the annular groove 12 will not flow back into the motor base 31 from the air outlets 311 due to excessive amount, thus not affecting the motor 32.

[0039] Since the air inlet 41 and air outlet 311 of the power head 3 are both located above the bottom shell of the lawnmower 100, and the bottom of the motor base 31 is closed, the bottom shell can play a good blocking role when the lawnmower 100's bottom shell and blades are cleaned with a high-pressure water gun, and water will not flow into the motor 32.

[0040] A guide rib 313 is provided at the air outlet 311. The guide rib 313 is deflected in a direction tangential to the rotation direction of the cooling airflow driven by the fan 33, so that the airflow direction at the air outlet 311 is consistent with the rotation direction of the fan 33. Preferably, when the rotation direction of the cooling airflow driven by the fan 33 is clockwise, the deflection direction of the guide rib 313 is deflected to the left relative to the rotation direction of the cooling airflow. This design will greatly improve the exchange efficiency of hot and cold air and can efficiently remove the heat generated by the lawnmower 100 during operation.

[0041] The waterproof rib 312 is formed between two adjacent air guide ribs 313, and the side of the waterproof rib 312 away from the annular groove 12 forms a downward sloping first slope 3120. The side of the waterproof rib 312 near the annular groove 12 is provided with an upward sloping second slope 3121 to guide the airflow inside the motor 32 to flow smoothly out from the air outlet 311. At the same time, the second slope 3121 can also make the water splashed on the second slope 3121 flow towards the annular groove 12.

[0042] The motor 32 is equipped with a motor shaft 321, which is connected to the working component (including blades) of the lawnmower 100 to transmit power to the working component, thereby driving the lawnmower 100 to perform the mowing action. The fan 33 is located on the top of the motor 32 and connected to the rotor of the motor 32, so that when the motor 32 is started, it can drive the fan 33 to rotate. During the rotation of the fan 33, the external cooling airflow enters from the air inlet 41, flows along the air inlet cavity 42, passes through the motor 32, and finally flows out from the air outlet 311.

[0043] The top of the air shroud 34 is provided with a vent 341, through which cooling airflow enters the motor 32, thereby carrying away the heat generated during the operation of the motor 32. The air shroud 34 is connected and fixed to the motor base 31 by screws (not shown) to enclose the motor 32 and the fan 33.

[0044] The motor base 31 has a recessed groove 314 on its bottom inner wall, located below the motor 32. An opening 3140 is provided at one end of the groove 314 near the air outlet 311, communicating with the outside to drain water that enters the groove 314. In other words, even if a small amount of water enters the motor base 31, it will quickly flow to the bottom of the motor base 31 under gravity, collect in the groove 314, and eventually drain out through the opening 3140. This design significantly improves the waterproof performance of the lawnmower 100 of this invention.

[0045] The opening 3140 is designed as a dark window structure, so that when the cavity at the bottom of the motor base 31 is flushed, water will not enter the interior of the motor base 31 and will not affect the motor 32.

[0046] The motor base 31 has a through hole 315 and an annular groove 316 at the center of its bottom. The through hole 315 is located at the center of the bottom of the motor base 31 to allow the motor shaft 321 to pass through. The annular groove 316 is located outside the through hole 315, and both the inner and outer sides of the annular groove 316 are provided with clamping walls 318. The height of the clamping walls 318 is slightly higher than the bottom surface of the motor base 31. In other words, two clamping walls 318 protrude beyond the bottom surface of the motor base 31, and the annular groove 316 is formed between the two clamping walls 318. Four grooves 314 are provided and are evenly distributed around the annular groove 316.

[0047] The motor 32 is located above the annular groove 316, which contains a wool felt 317. The height of the wool felt 317 is greater than the depth of the annular groove 316 (which can also be understood as the height of the clamping wall 318), causing the wool felt 317 to protrude from the annular groove 316. During installation, the motor 32 presses the wool felt 317 downwards and outwards, causing it to deform. This wool felt 317 connects the motor 32 to the annular groove 316 and seals the gap between them, thus providing a sealing and waterproofing effect. Alternatively, in other embodiments, the wool felt 317 can be replaced with other elastic sealing materials, such as rubber rings.

[0048] The energy device is preferably a battery pack, which powers the motor 32 and other electronic components. The power head 3 is provided with a battery compartment 50 for accommodating the battery pack. The battery compartment 50 and the housing assembly 40 are respectively injection molded and then assembled together, but this is not a limitation.

[0049] The battery pack contains multiple battery cells, which are arranged longitudinally along the battery pack in this embodiment. In other embodiments, the battery pack may have different shapes, and the battery cells may be arranged in other directions. Depending on the number and arrangement of the battery cells, the battery pack can output different voltages. In this embodiment, the battery pack is an 80V battery pack. Of course, battery packs with other voltages are still within the scope of protection of this invention. In this invention, the number of battery packs is at least two, which are arranged side by side laterally along the power head 3 and are both located in the battery compartment 50.

[0050] like Figures 9 to 12 and combined Figure 3 , Figure 4As shown, the housing assembly 40 includes a cover that assembles with the motor base 31. The cover includes a first cover 43 and a second cover 44 distributed to the left and right, an upper cover 45 covering the first cover 43 and the second cover 44, and a flip cover 46 that can be flipped relative to the upper cover 45. During installation, the first cover 43 and the second cover 44 are first assembled and fixed to the motor base 31, then the upper cover 45 is fixed to the top of the first cover 43 and the second cover 44, and finally the flip cover 46 is assembled and fixed to the upper cover 45.

[0051] The first cover 43 and the second cover 44 are assembled and fixed together. The first cover 43 is provided with a protruding rib 431, and the second cover 44 is provided with a corresponding recessed receiving groove 441. The protruding rib 431 is received in the receiving groove 441. This not only allows the first cover 43 to be assembled and fixed with the second cover 44, but also seals the installation gap between the first cover 43 and the second cover 44. The installation stability is good and the waterproof effect is excellent.

[0052] The top of both the first cover 43 and the second cover 44 is provided with the air inlet 41 and the air inlet cavity 42. Since the air inlet 41 on the first cover 43 and the air inlet 41 on the second cover 44 are symmetrically arranged with respect to the center line of the power head 3, and the air inlet cavity 42 on the first cover 43 and the air inlet cavity 42 on the second cover 44 are also symmetrically arranged with respect to the center line of the power head 3, the following description will take the air inlet 41 and the air inlet cavity 42 provided on the first cover 43 as an example for detailed explanation.

[0053] The air inlet 41 is located to the left rear of the first cover 43 (i.e., near the push rod 2) and tilts downwards and backwards, so that when the lawnmower 100 is placed on the ground and exposed to rain, rainwater cannot enter the power head 3 through the air inlet 41. The air inlet cavity 42 includes a first ramp 421 located near the air inlet 41, a second ramp 422 located away from the air inlet 41, and a guide plate 423 located beside the first ramp 421 and the second ramp 422. The first ramp 421, the second ramp 422, the guide plate 423, and the inner wall of the first cover 43 together form a U-shaped structure with an open top in the air inlet cavity 42.

[0054] The first ramp 421 slopes down towards the air inlet 41, and the second ramp 422 slopes up towards the air inlet 41. This design ensures that even if water droplets splash into the air inlet 41, they will slide down the first ramp 421 and flow out of the air inlet 41, providing good waterproofing. When the upper cover 45 is installed on the first cover 43 and the second cover 44, the U-shaped air inlet cavity 42 and the upper cover 45 together form a closed airflow channel 424 (see details). Figure 12 Furthermore, the airflow channel 424 extends from the rear end of the power head 3 to the front end.

[0055] To prevent grass clippings, dust, and other debris from entering the power head 3 with the cooling airflow and causing damage to the motor 32 and electronic components, a filter element (not shown) is provided in the air inlet cavity 42. In this embodiment, the filter element is a sponge. To fix the sponge in the air inlet cavity 42, a fixing bracket 411 is also provided at the air inlet 41 to fix the sponge.

[0056] The first cover 43 is provided with a first water-retaining extension 432, and the second cover 44 is provided with a second water-retaining extension 442. The first water-retaining extension 432 and the second water-retaining extension 442 are connected to each other and located around the battery compartment 50. When the upper cover 45 is installed on the first cover 43 and the second cover 44, the two water-retaining extensions can fill the gap between the upper cover 45 and the first cover 43 and the second cover 44, so that rainwater will not seep in from the connection between the upper cover 45 and the first cover 43 and the second cover 44.

[0057] The motor assembly 30 is housed at the rear of the first housing 43 and the second housing 44 (i.e., near the push rod 2) and is covered by the rear end of the upper housing 45. The battery compartment 50 is located at the front of the first housing 43 and the second housing 44 to separate the motor assembly 30 and the battery pack.

[0058] The air inlet 41 and air inlet cavity 42 are covered by the rear end of the upper cover 45. The front end of the upper cover 45 has a through hole 452 that matches the battery compartment 50 for inserting and removing the battery pack, so that the battery pack can be inserted into the battery compartment 50 through the through hole 452. The flip cover 46 covers the through hole 452 and the top of the battery compartment 50, and the flip cover 46 can be opened and closed relative to the upper cover 45 to perform the insertion and removal operation of the battery pack.

[0059] A third water-blocking extension 451 is provided at the connection point between the upper cover 45 and the flip cover 46 to seal the gap between them, thus preventing rainwater from entering the battery compartment 50 from the connection point. While the flip cover 46 itself prevents rainwater or other liquids from entering the battery compartment 50, the third water-blocking extension 451 further enhances the waterproofing effect. The first water-blocking extension 432, the second water-blocking extension 442, and the third water-blocking extension 451 form a continuous water-blocking extension surrounding the through-hole 452, protecting the battery compartment 50 and preventing rainwater from entering and damaging the battery pack.

[0060] The top rear end of the housing assembly 40 is recessed from bottom to top to form a gripping cavity 47. The gripping cavity 47 is formed on the side of the housing assembly 40 near the push rod 2 and on the center line of the power head 3. This gripping cavity 47 can be used as a rear handle, so when carrying the lawnmower 100, there is no need to add additional handle parts; you can directly hold the front handle 7 and the rear handle 47 with your left and right hands respectively for carrying. The distance between the front and rear handles is designed to be shorter than the length of your arm, so that the arm bears the most comfortable force. In this way, not only can the machine be balanced and carried with less effort, but the strength of the housing assembly 40 can also be increased.

[0061] The first cover 43 has a first L-shaped cavity 471 formed by a downward indentation on the side near the second cover 44, and the first L-shaped cavity 471 is disposed near the top of the first cover 43; the second cover 44 has a second L-shaped cavity 472 formed by a downward indentation on the side near the first cover 43, and the second L-shaped cavity 472 is disposed near the top of the second cover 44; the gripping cavity 47 is formed by the combination of the first L-shaped cavity 471 and the second L-shaped cavity 472.

[0062] Preferably, the first L-shaped cavity 471 and the second L-shaped cavity 472 are symmetrically arranged with respect to the center line of the power head 3, and both the first L-shaped cavity 471 and the second L-shaped cavity 472 have rounded corners for smooth transition to ensure grip comfort. The width of the grip cavity 47 is greater than 80mm; in other words, the sum of the widths of the first L-shaped cavity 471 and the second L-shaped cavity 472 is greater than 80mm.

[0063] The rib 431 protrudes from the edge of the first L-shaped cavity 471 of the first cover 43, and the receiving groove 441 is recessed into the edge of the second L-shaped cavity 472 of the second cover 44. A fixing post 433 is provided on the top of the first cover 43 near the rib 431, and a corresponding fixing post 433 is provided on the top of the second cover 44 near the receiving groove 441. One of the two fixing posts 433 is a screw hole, and the other is a screw through hole, allowing screws to pass through the two fixing posts 433 to fix the first cover 43 and the second cover 44.

[0064] The purpose of setting the fixing posts 433 inside the first cover 43 and the second cover 44 is: 1. to fix the first cover 43 and the second cover 44 inside, so as to avoid the screws being inserted from the outside and affecting the waterproof effect of the power head 3; 2. both fixing posts 433 are wrapped by the upper cover 45, making the appearance of the power head 3 more beautiful.

[0065] The housing assembly 40 also houses a control board 48 located near the battery pack for controlling the motors. Two control boards 48 are provided to detect and control the self-propelled motor (not shown) and the main blade motor 32, respectively. One end of the air inlet chamber 42 is connected to the air inlet 41, and the other end extends to the corresponding control board 48, guiding the cooling airflow entering from the air inlet 41 to the control board 48 for cooling and heat dissipation.

[0066] To enhance cooling, the control board 48 is equipped with a heat sink 481, and the other end of the air inlet cavity 42 is positioned close to the heat sink 481. In other words, the air inlet cavity 42 is positioned as close as possible to the heat sink 481 to ensure that the heat sink 481 is adequately cooled. Since there are two air inlets 41 and two air inlets 42, two air intakes are formed, which can respectively cool the control board 48 and the heat sink 481 located on the left and right sides of the rear end of the battery compartment 50.

[0067] The motor 32 is located below the control board 48. When the motor 32 is started, the fan 33 rotates and drives the cooling airflow at the control board 48 into the motor 32. This causes the heat generated by the control board 48, the motor 32 and the battery pack to be blown along the internal rotor air gap of the motor 32 to the bottom of the motor base 31 and discharged from the air outlet 311.

[0068] Heat dissipation process: Motor 32 starts, fan 33 rotates and generates suction. External cooling airflow enters through air inlet 41 under the suction of fan 33 and flows into the power head 3 along air inlet cavity 42. The cooling airflow entering the power head 3 first passes through control board 48 and heat sink 481, then flows downwards to the vent 341 of the air shroud 34, and enters the motor 32 from the vent 341, finally exiting from the air outlet 311 at the bottom of motor mount 31. During the flow of cooling airflow, heat is carried away from the battery pack, control board 48, and inside the motor 32, allowing the power head 3 to operate at a relatively stable temperature.

[0069] In summary, the lawnmower 100 of the present invention, by configuring the motor base 31 with a closed bottom and an air outlet 311 on the side, prevents water from entering the motor base 31 through the air outlet 311 when cleaning the bottom of the lawnmower 100. Combined with the design of some waterproof structures (such as waterproof ribs 312, annular grooves 12, drainage holes 121, grooves 314, openings 3140, felt 317, protruding ribs 431, receiving grooves 441, first water-blocking extensions 432, second water-blocking extensions 442, and third water-blocking extensions 451), the lawnmower 100 of the present invention achieves optimal waterproof performance.

[0070] In addition, by providing a gripping cavity 47 at the top rear end of the power head 3, which can be used as a rear handle, when moving the lawnmower 100, there is no need to add additional handle parts; the front handle 7 and the rear handle 47 can be gripped directly with the left and right hands respectively for moving.

[0071] Furthermore, by providing an air inlet 41 and an air inlet cavity 42 at the top and rear end of the power head 3, external cooling airflow can enter the interior of the power head 3 through the air inlet 41 and the air inlet cavity 42, carrying away the heat from the battery pack, control board 48 and motor 32, thus achieving optimal heat dissipation performance of the lawnmower 100 of the present invention.

[0072] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A lawnmower, comprising a main body and a power head mounted on the main body, the main body including a mounting shell with a recessed mounting groove, the power head including a motor assembly received in the mounting groove and a housing assembly covering the motor assembly, the motor assembly including a motor mount assembled with the mounting shell and a motor fixed on the motor mount, characterized in that: The motor base is closed at the bottom, with an air outlet on the side and a waterproof rib protruding from the air outlet for partial shielding. The mounting bottom surface of the housing assembly corresponding to the air outlet is vertically offset from the waterproof rib. The mounting housing also has an annular groove recessed around the mounting groove, the recess depth of which is greater than that of the mounting groove. A water leakage hole is provided in the annular groove, which communicates with the outside. The waterproof rib has a downward sloping first ramp on the side away from the annular groove and an upward sloping second ramp on the side closer to the annular groove to guide airflow from the air outlet. The bottom inner wall of the motor base has a recessed groove located below the motor. The end of the groove near the air outlet has an opening designed as a concealed window structure that communicates with the outside to drain water that enters the groove.

2. The lawnmower according to claim 1, characterized in that: The motor assembly also includes a fan located on top of the motor, and a guide rib is provided at the air outlet. The guide rib is deflected so that the airflow direction at the air outlet is consistent with the rotation direction of the fan; the waterproof rib is formed between two adjacent guide ribs.

3. The lawnmower according to claim 1, characterized in that: The motor base has an annular groove at the bottom center, the motor is located above the annular groove, and the power head also includes a wool felt that is contained in the annular groove. The wool felt is used to connect the motor and the annular groove and seal the gap between the motor and the annular groove.

4. The lawnmower according to claim 3, characterized in that: The motor base has a through hole at the bottom center for the motor shaft to pass through. The annular groove is located on the outside of the through hole. There are four grooves, which are evenly distributed around the annular groove.

5. The lawnmower according to claim 1, characterized in that: The housing assembly includes a first cover and a second cover that are assembled and fitted with the motor base. The first cover and the second cover are assembled and fixed to each other. The first cover is provided with a protruding rib, and the second cover is provided with a corresponding recessed receiving groove. The protruding rib is received in the receiving groove to seal the installation gap between the first cover and the second cover.

6. The lawnmower according to claim 5, characterized in that: The first cover and the second cover are respectively provided with an air inlet and an air inlet cavity. The air inlet is inclined to the rear and downward. The air inlet cavity includes a first ramp set near the air inlet and a second ramp set away from the air inlet. The first ramp slopes down towards the air inlet, and the second ramp slopes up towards the air inlet.

7. The lawnmower according to claim 6, characterized in that: The first cover is provided with a first water-blocking extension, and the second cover is provided with a second water-blocking extension, and the first water-blocking extension and the second water-blocking extension are connected to each other.

8. The lawnmower according to claim 5, characterized in that: The housing assembly further includes an upper cover covering the first and second covers and a flip cover that can be flipped relative to the upper cover. A third water-blocking extension is provided at the position where the upper cover connects with the flip cover to seal the gap between the upper cover and the flip cover.

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