阅读说明：本技术 动力头及割草机 (Unit head and lawn mower ) 是由 肖愚 于 2019-12-06 设计创作，主要内容包括：本发明提供了一种动力头及割草机,所述动力头包括电机组件、能量装置及遮罩于所述电机组件和能量装置外侧的壳体组件,所述电机组件包括电机座及固定在所述电机座上的电机,所述壳体组件包括与所述电机座组装配合的罩壳,所述罩壳的顶部开设有朝向后下方倾斜的进风口及与所述进风口相连接的进风腔,所述进风口和所述进风腔分别设置有两个且对称设置在所述罩壳的左右两侧,所述进风腔为上部开口的U型结构,所述罩壳遮盖在所述进风腔的顶部,以形成闭合的气流通道,所述电机座的底部封闭、侧边设有与外界相通的出风口,冷却气流自所述进风口进入并沿所述气流通道流入所述电机内部,再从所述出风口流出。(The invention provides a power head and a mower, wherein the power head comprises a motor component, an energy device and a shell component covering the outer sides of the motor component and the energy device, the motor component comprises a motor base and a motor fixed on the motor base, the shell component comprises a housing assembled with the motor base, the top of the housing is provided with an air inlet inclining towards the rear lower direction and an air inlet cavity connected with the air inlet, the air inlet and the air inlet cavity are respectively provided with two air outlets symmetrically arranged at the left side and the right side of the housing, the air inlet cavity is of a U-shaped structure with an open upper part, the housing covers the top of the air inlet cavity to form a closed airflow channel, the bottom of the motor base is closed, the side edge of the motor base is provided with an air outlet communicated with the outside, cooling airflow enters from the air inlet and flows into the motor along the airflow channel, and then flows out from the air outlet.)

1. The utility model provides a power head, includes motor element, energy device and shade in the casing element in the motor element and energy device outside, motor element includes the motor cabinet and fixes motor on the motor cabinet, casing element include with the housing of motor cabinet assembly closes, its characterized in that: the utility model discloses a motor cabinet, including housing, air inlet chamber, motor cabinet, side, motor cabinet, air inlet, the top of housing seted up towards the slope of rear below and with the air inlet chamber that is connected of air inlet, the air inlet with the air inlet chamber is provided with two and the symmetry setting respectively and is in the left and right sides of housing, the air inlet chamber is upper portion open-ended U type structure.

2. The powerhead of claim 1, wherein: the energy device comprises an energy device, a housing and an air inlet cavity, wherein the housing is internally provided with a control panel close to the energy device, one end of the air inlet cavity is connected with the air inlet, and the other end of the air inlet cavity extends to the control panel, so that cooling air flow entering from the air inlet is guided to the control panel.

3. The powerhead of claim 2, wherein: the control panel is provided with a radiating fin, and the other end of the air inlet cavity is close to the radiating fin.

4. The powerhead of claim 2, wherein: the motor is located the below of control panel, motor element still including locating the fan at motor top, when the motor starts, the fan rotates and drives the cooling air current of control panel department and gets into inside the motor.

5. The powerhead of claim 4, wherein: the motor assembly further comprises a cover, a wind gathering cover is arranged on the outer side of the motor and the fan, a ventilation opening is formed in the top of the wind gathering cover, and therefore when the fan rotates, cooling airflow at the position of the control board is driven to enter the motor from the ventilation opening.

6. The powerhead of claim 4, wherein: the number of the air outlets is at least two, and air is discharged in different directions; and an air guide rib plate is arranged at the air outlet of the motor base, deflects and is tangent to the rotation direction of the cooling air flow driven by the fan, so that the air flow direction at the air outlet is consistent with the rotation direction of the fan.

7. The powerhead of claim 6, wherein: when the rotation direction of the cooling air flow driven by the fan is clockwise, the deflection direction of the air guide rib plate deflects leftwards relative to the rotation direction of the cooling air flow.

8. The powerhead of claim 1, wherein: the air inlet cavity comprises a first ramp and a second ramp, the first ramp is arranged close to the air inlet, the second ramp is arranged far away from the air inlet, the first ramp slopes downwards towards the air inlet, and the second ramp slopes upwards towards the air inlet.

9. The powerhead of claim 1, wherein: the housing includes first housing and second housing and the last housing of shade above first housing and second housing that the equipment is fixed each other, first housing all is equipped with the second housing air intake and air inlet chamber, just the air intake of first housing with the air intake of second housing for the central line bilateral symmetry of unit head, the air inlet chamber of first housing with the air inlet chamber of second housing also for the central line bilateral symmetry of unit head, airflow channel by the air inlet chamber with go up the housing and enclose and establish the formation.

10. The utility model provides a lawn mower, includes the main part, certainly the main part upwards backward extension the push rod and install the unit head on the main part, its characterized in that: the power head is as claimed in any one of claims 1 to 9, and an air inlet on the power head is arranged close to the push rod.

Technical Field

The invention relates to a power head and a mower, and belongs to the technical field of garden tools.

Background

Lawnmowers are currently the most commonly used lawn mowing devices, and due to the increased demand for the functionality of lawnmowers, the power requirements of lawnmowers are increasing.

Disclosure of Invention

The invention aims to provide a power head which has a good heat dissipation effect.

In order to achieve the purpose, the invention provides a power head, which comprises a motor assembly, an energy device and a shell assembly covering the motor assembly and the energy device, wherein the motor assembly comprises a motor base and a motor fixed on the motor base, the shell assembly comprises a housing assembled with the motor base, the top of the housing is provided with an air inlet inclining towards the rear lower direction and an air inlet cavity connected with the air inlet, the air inlet and the air inlet cavity are respectively provided with two air outlets which are symmetrically arranged at the left side and the right side of the housing, the air inlet cavity is of a U-shaped structure with an open upper part, the housing covers the top of the air inlet cavity to form a closed airflow channel, the bottom of the motor base is closed, the side edge of the motor base is provided with an air outlet communicated with the outside, and cooling airflow enters from the air inlet and flows into the motor along the airflow channel, and then flows out from the air outlet.

As a further improvement of the present invention, a control panel is further accommodated in the housing, the control panel being close to the energy device, and one end of the air inlet chamber is connected to the air inlet, and the other end of the air inlet chamber extends to the control panel, so as to guide the cooling air flow entering from the air inlet to the control panel.

As a further improvement of the invention, the control panel is provided with a radiating fin, and the other end of the air inlet cavity is arranged close to the radiating fin.

As a further improvement of the present invention, the motor is located below the control board, the motor assembly further includes a fan disposed on the top of the motor, and when the motor is started, the fan rotates and drives the cooling air flow at the control board to enter the motor.

As a further improvement of the present invention, the motor assembly further includes a wind-collecting cover covering the outer sides of the motor and the fan, and a vent is disposed at the top of the wind-collecting cover, so that when the fan rotates, the cooling airflow at the control board is driven to enter the motor from the vent.

As a further improvement of the invention, at least two air outlets are arranged to discharge air in different directions; and an air guide rib plate is arranged at the air outlet of the motor base, deflects and is tangent to the rotation direction of the cooling air flow driven by the fan, so that the air flow direction at the air outlet is consistent with the rotation direction of the fan.

As a further improvement of the present invention, when the rotation direction of the cooling airflow by the fan is clockwise, the deflection direction of the air guide rib deflects leftward relative to the rotation direction of the cooling airflow.

As a further improvement of the invention, the air inlet cavity comprises a first ramp arranged close to the air inlet and a second ramp arranged far away from the air inlet, the first ramp slopes downwards towards the air inlet, and the second ramp slopes upwards towards the air inlet.

As a further improvement of the present invention, the housing includes a first housing and a second housing assembled and fixed to each other, and an upper housing covering the first housing and the second housing, the first housing and the second housing are both provided with the air inlet and the air inlet cavity, the air inlet of the first housing and the air inlet of the second housing are bilaterally symmetric with respect to a center line of the power head, the air inlet cavity of the first housing and the air inlet cavity of the second housing are also bilaterally symmetric with respect to the center line of the power head, and the airflow channel is formed by the air inlet cavity and the upper housing.

The invention also aims to provide the mower which has a good heat dissipation effect.

In order to achieve the purpose, the invention provides a mower which comprises a main body, a push rod and a power head, wherein the push rod extends upwards and backwards from the main body, the power head is arranged on the main body, and an air inlet in the power head is arranged close to the push rod.

The invention has the beneficial effects that: according to the invention, the air inlet which is inclined towards the rear lower part, the air inlet cavity connected with the air inlet and the airflow channel formed by the enclosure and the air inlet cavity are arranged at the top of the enclosure, and the motor base is designed to be closed at the bottom and provided with the air outlet communicated with the outside at the side edge, so that cooling airflow can enter from the air inlet and flow into the motor along the airflow channel, and finally flows out from the air outlet, thereby forming a circulating cooling and heat dissipation system and improving the heat dissipation effect of the power head of the mower.

Drawings

Fig. 1 is a perspective view of the mower of the present invention.

Fig. 2 is a perspective view of the mounting housing of fig. 1.

Fig. 3 is a perspective view of the powerhead of fig. 1.

Figure 4 is an exploded view of the powerhead of figure 3.

Fig. 5 is an exploded view of the motor assembly of fig. 4.

Fig. 6 is a perspective view of the motor mount of fig. 5.

Fig. 7 is a cross-sectional view of the mower of fig. 1.

Fig. 8 is an enlarged view of the circled portion in fig. 7.

Fig. 9 is a perspective view of the first cover in fig. 4.

Fig. 10 is a perspective view of the second closure of fig. 4.

Fig. 11 is a perspective view of the upper housing of fig. 4.

Fig. 12 is a perspective view of the assembled housing assembly.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the present invention discloses a lawn mower 100, which comprises a main body 1, a push rod 2 extending backward from the rear of the main body 1, a power head 3 installed on the main body 1, a traveling wheel 5 installed at the bottom of the main body 1, and a grass collecting bag 6 installed at the rear of the main body 1 for collecting grass clippings, wherein the structures of the push rod 2, the traveling wheel 5, and the grass collecting bag 6 are all the existing structures, so the detailed description is omitted here, and the following description will mainly describe the specific structure of the power head 3 and the connection relationship between the power head 3 and the main body 1 in detail.

As shown in fig. 2, the main body 1 includes a mounting case 10 in which a mounting groove 11 is concavely formed, and the mounting groove 11 is formed to be depressed downward from a middle position of the mounting case 10 and has a substantially circular ring shape. The bottom wall 110 of the mounting groove 11 is provided with a receiving hole 111, so that a screw can pass through the receiving hole 111 to assemble and fix the bottom of the power head 3 with the bottom wall 110 of the mounting groove 11.

An annular groove 12 is further concavely arranged in the mounting shell 10, the annular groove 12 is formed on the periphery of the mounting groove 11, and the depth of the recess of the annular groove 12 is greater than that of the recess of the mounting groove 11, so that a height difference is formed between the mounting groove 11 and the annular groove 12. The annular groove 12 is internally provided with the water leakage hole 121, and the water leakage hole 121 is communicated with the outside, so that when the mower 100 is used in rainy days or humid areas, rainwater on the power head 3 can slide into the annular groove 12 and finally flow out from the water leakage hole 121, and therefore the accumulated water in the mounting shell 10 can be smoothly discharged.

In this embodiment, four receiving holes 111 are provided to stably mount the power head 3 in the mounting case 10; the water leakage holes 121 are provided with five water leakage holes which are evenly distributed in the annular groove 12 so as to divide the accumulated water in the annular groove 12 and ensure that the accumulated water in the annular groove 12 is completely discharged.

The power head 3 is used as a replaceable element, can replace a small internal combustion engine, and can be applied to various devices, such as outdoor power equipment, including a mower, a snowplow, a cleaning machine, a scarifier and the like. The present invention will be described in detail with reference to a lawn mower as an example, but the present invention is not limited thereto.

As shown in fig. 3 to 8 in combination with fig. 2, the power head 3 includes a motor assembly 30 accommodated in the mounting groove 11, an energy device (not shown), and a housing assembly 40 covering the motor assembly 30 and the energy device. The shell assembly 40 is provided with an air inlet 41 and an air outlet 311, and the shell assembly 40 is further provided with an air inlet cavity 42 connected with the air inlet 41. The motor assembly 30 includes a motor base 31 assembled with the mounting case 10, a motor 32 fixed on the motor base 31, a fan 33 disposed on the top of the motor 32, and a wind-collecting cover 34 covering the outside of the motor 32 and the fan 33.

The bottom of the motor base 31 is closed, the side edge of the motor base 31 is provided with an air outlet 311 communicated with the outside and a waterproof rib 312 protruding from the air outlet 311 for partial shielding, and the waterproof rib 312 is arranged, so that the motor base 31 and the shell assembly 40 are arranged in a vertically staggered manner, that is, the mounting bottom surface of the shell assembly 40 corresponding to the air outlet 311 is lower than the upper surface of the waterproof rib 312, and thus rainwater can be prevented from splashing into the air outlet 311 and entering the motor 32.

In addition, the upper surface of the annular groove 12 is also lower than the upper surface of the waterproof rib 312, so that accumulated water can be prevented from entering the motor base 31 from the air outlet 311. Specifically, the bottom of the motor base 31 and the bottom wall 110 of the mounting groove 11 are fastened and fixed by screws through the receiving holes 111, the annular groove 12 is distributed around the periphery of the motor base 31, in other words, the motor base 31 does not shield the annular groove 12, so that rainwater flowing down from the top of the power head 3 flows into the annular groove 12 along the housing assembly 40 of the power head 3, and is finally discharged from the water leakage holes 121 in the annular groove 12.

It should be noted that: the air outlets 311 may be disposed at one circle of the bottom side of the motor base 31, that is, at least two air outlets 311 may be disposed, in the embodiment of the present invention, three air outlets 311 are disposed to discharge air in three directions. Because of the bottom setting that the air outlet 311 is close to motor cabinet 31, and dislocation set about waterproof muscle 312 and casing assembly 40 to have a take the altitude, thereby the rainwater can not splash into air outlet 311, and ponding in the ring channel 12 also can not be because of the volume is many and follow air outlet 311 and flow back into motor cabinet 31, produce the influence to motor 32.

Because the air inlet 41 and the air outlet 311 of the power head 3 are both located above the bottom case of the mower 100, and the bottom of the motor base 31 is sealed, when the high-pressure water gun is used for cleaning the bottom case and the blades of the mower 100, the bottom case can play a good role in blocking, and water cannot flow into the motor 32.

The air outlet 311 is provided with an air guide rib 313, the air guide rib 313 deflects, and the deflection direction is tangential to the rotation direction of the cooling air flow driven by the fan 33, so that the air flow 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 air guide ribs 313 deflects leftward relative to the rotation direction of the cooling airflow, and this design will greatly improve the exchange efficiency of the hot and cold air, and can efficiently discharge the heat generated by the mower 100 during operation.

The waterproof rib 312 is formed between two adjacent air guide rib plates 313, one side of the waterproof rib 312, which is far away from the annular groove 12, forms a first inclined slope 3120 which inclines downwards, one side of the waterproof rib 312, which is close to the annular groove 12, is provided with a second inclined slope 3121 which inclines upwards, so that air flow inside the motor 32 is guided to smoothly flow out from the air outlet 311, and meanwhile, the second inclined slope 3121 can enable water splashed onto the second inclined slope 3121 to flow towards the annular groove 12.

The motor 32 is provided with a motor shaft 321, and the motor shaft 321 is connected with a working component (including a blade) of the mower 100 to transmit power to the working component so as to drive the mower 100 to perform mowing action. The fan 33 is disposed on the top of the motor 32 and connected to the rotor of the motor 32, so that when the motor 32 is started, the fan 33 is driven to rotate, and during the rotation of the fan 33, external cooling airflow is driven to enter from the air inlet 41, flow along the air inlet cavity 42, pass through the motor 32, and finally flow out from the air outlet 311.

The top of the air collecting cover 34 is provided with a vent 341, and cooling airflow enters the motor 32 from the vent 341, so as to take away heat generated in the working process of the motor 32. The wind-collecting cover 34 is fixed to the motor base 31 by screws (not shown) to surround the motor 32 and the fan 33.

A groove 314 is concavely arranged on the inner side wall of the bottom of the motor base 31, the groove 314 is positioned below the motor 32, an opening 3140 is arranged at one end of the groove 314 close to the air outlet 311, and the opening 3140 is communicated with the outside so as to discharge water entering the groove 314. That is, even if a small amount of accumulated water enters the motor base 31, the accumulated water will flow to the bottom of the motor base 31 rapidly under the action of gravity, and then converge into the groove 314, and finally be discharged from the opening 3140, so that the waterproof performance of the mower 100 of the present invention is greatly improved.

The opening 3140 is designed as a blind window structure, so that when the cavity at the bottom of the motor base 31 is washed, water cannot enter the inside of the motor base 31, and the motor 32 cannot be affected.

Motor cabinet 31's bottom intermediate position department still is equipped with perforation 315 and annular groove 316, perforation 315 sets up at motor cabinet 31's bottom center to power supply motor shaft 321 passes, annular groove 316 locates perforation 315's the outside, just annular groove 316's the inside and outside all is equipped with double-layered wall 318, double-layered wall 318's the bottom surface that highly is slightly higher than motor cabinet 31. In other words, two sandwiching walls 318 protrude beyond the bottom surface of the motor mount 31, and an annular groove 316 is formed between the two sandwiching walls 318. The four grooves 314 are uniformly distributed on the periphery of the annular groove 316.

The motor 32 is located above the annular groove 316, a wool felt 317 is limited and contained in the annular groove 316, and the height of the wool felt 317 is greater than the recessed depth of the annular groove 316 (which can also be understood as the height of the clamping wall 318), so that the wool felt 317 protrudes out of the annular groove 316, and the wool felt 317 is pressed downwards and outwards in the installation process of the motor 32, so that the wool felt 317 is deformed, and at the moment, the wool felt 317 can be used for connecting the motor 32 with the annular groove 316 and sealing a gap between the motor 32 and the annular groove 316, and sealing and waterproof effects are achieved. Of course, in other embodiments, the wool felt 317 may be replaced by other sealing materials with elasticity, such as rubber rings.

The energy device is preferably a battery pack that powers the motor 32 and other electronic components. The power head 3 is provided with a battery compartment 50 for accommodating a battery pack, and the battery compartment 50 and the housing assembly 40 are assembled together after being respectively injection molded, but not limited thereto.

The battery pack contains a plurality of battery cells, and in the embodiment, the battery cells are arranged along the longitudinal direction of the battery pack. In other embodiments, the battery pack may have different shapes, and the battery cells may also be arranged along other directions. According to the number and the combination mode of the battery cells, the battery pack can output different voltages. In this embodiment, the battery pack is an 80V battery pack. Of course, other voltage battery packs are within the scope of the present invention. In the present invention, the number of the battery packs is at least two, and the two battery packs are arranged in parallel along the lateral direction of the power head 3 and are both located in the battery compartment 50.

As shown in fig. 9 to 12 in combination with fig. 3 and 4, the housing assembly 40 includes a cover case assembled and matched with the motor base 31, the cover case includes a first cover case 43 and a second cover case 44 distributed from left to right, an upper cover case 45 covering the first cover case 43 and the second cover case 44, and a flip cover 46 capable of being turned relative to the upper cover case 45. When the motor base is installed, the first housing 43 and the second housing 44 are assembled and fixed with the motor base 31, then the upper housing 45 is fixed on the top of the first housing 43 and the top of the second housing 44, and finally the flip cover 46 is assembled and fixed with the upper housing 45.

The first cover shell 43 and the second cover shell 44 are assembled and fixed with each other, the first cover shell 43 is provided with a convex rib 431, the second cover shell 44 is correspondingly and concavely provided with an accommodating groove 441, and the convex rib 431 is accommodated in the accommodating groove 441, so that the first cover shell 43 can be assembled and fixed with the second cover shell 44, an installation gap between the first cover shell 43 and the second cover shell 44 can be sealed, the installation stability is good, and the waterproof effect is good.

The air inlet 41 and the air inlet cavity 42 are disposed on the top of the first housing 43 and the top of the second housing 44, and because the air inlet 41 on the first housing 43 and the air inlet 41 on the second housing 44 are disposed symmetrically left and right with respect to the center line of the power head 3, and the air inlet cavity 42 on the first housing 43 and the air inlet cavity 42 on the second housing 44 are also disposed symmetrically left and right with respect to the center line of the power head 3, the following descriptions will take the air inlet 41 and the air inlet cavity 42 disposed on the first housing 43 as an example, and thus will be described in detail.

The air inlet 41 is disposed at the left rear side of the first housing 43 (i.e., disposed near the push rod 2) and is inclined toward the rear lower side, so that when the lawnmower 100 is placed on the ground and is exposed to rain, rainwater cannot enter the inside of the power head 3 from the air inlet 41. The air inlet cavity 42 includes a first ramp 421 disposed close to the air inlet 41, a second ramp 422 disposed far away from the air inlet 41, and a guide piece 423 disposed beside the first ramp 421 and the second ramp 422, and the first ramp 421, the second ramp 422, the guide piece 423 and the inner side wall of the first housing 43 together enclose the air inlet cavity 42 into a U-shaped structure with an upper opening.

The first ramp 421 descends towards the air inlet 41, and the second ramp 422 ascends towards the air inlet 41, so that even if water drops splash into the air inlet 41, the water drops slide down from the first ramp 421 and flow out from the air inlet 41, and the waterproof effect is good. The U-shaped air inlet chamber 42 and the upper housing 45 together form a closed air flow path 424 (see fig. 12 in particular) when the upper housing 45 is mounted to the first and second housings 43 and 44, and the air flow path 424 extends from the rear end to the front end of the power head 3.

In order to prevent other debris such as grass dust and dust from entering the power head 3 along with the cooling airflow to damage the motor 32 and the electronic components, a filter element (not shown) is disposed in the air inlet cavity 42, and in this embodiment, the filter element is a sponge. In order to fix the sponge in the air inlet cavity 42, a fixing bracket 411 is further disposed at the air inlet 41 to fix the sponge.

The first housing 43 is provided with a first water retaining extension 432, the second housing 44 is provided with a second water retaining extension 442, and the first water retaining extension 432 and the second water retaining extension 442 are connected with each other and located around the battery compartment 50. When the upper cover case 45 is mounted to the first cover case 43 and the second cover case 44, the two water blocking extensions may fill up the gap between the upper cover case 45 and the first cover case 43 and the second cover case 44, so that rainwater does not penetrate from the connection of the upper cover case 45 and the first cover case 43 and the second cover case 44.

The motor assembly 30 is received in the rear portion of the first and second housings 43 and 44 (i.e., the side close to the push rod 2) and covered by the rear end of the upper housing 45, and the battery compartment 50 is provided in the front portion of the first and second housings 43 and 44 to separately place the motor assembly 30 and the battery pack.

The air inlet 41 and the air inlet cavity 42 are covered by the rear end of the upper cover shell 45, and the front end of the upper cover shell 45 is provided with a through hole 452 which is matched with the battery compartment 50 for inserting and pulling the battery pack, so that the battery pack can be put into the battery compartment 50 through the through hole 452. The flip 46 covers the through hole 452 and the top of the battery chamber 50, and the flip 46 can be opened and closed relative to the upper housing 45 so as to perform the inserting and pulling operation of the battery pack.

A third water blocking extension 451 is disposed at a position where the upper cover 45 is connected to the flip 46 to seal a gap between the upper cover 45 and the flip 46, so that rainwater does not enter the battery compartment 50 from a connection position of the upper cover 45 and the flip 46. Of course, the flip cover 46 itself can prevent rain or other liquid from entering the battery compartment 50, and the third water blocking member 451 is provided to make the waterproof effect better. The first water retaining extension 432, the second water retaining extension 442 and the third water retaining extension 451 form a whole water retaining extension surrounding the periphery of the through hole 452, so as to protect the battery compartment 50 and prevent rainwater from entering the battery compartment 50 and damaging the battery pack.

The rear end of the top of the shell assembly 40 is recessed from bottom to top to form a holding cavity 47, and the holding cavity 47 is formed on one side of the shell assembly 40 close to the push rod 2 and formed on the central line of the power head 3. The holding cavity 47 can be used as a rear handle, so that when the mower 100 is carried, the front handle 7 and the rear handle 47 can be directly held by the left hand and the right hand respectively for carrying without adding extra handle parts. The distance between the front and rear handles is designed to be shorter than the length of the arm, so that the arm is most comfortable in stress, the balance of the machine and labor-saving in carrying can be ensured, and the strength of the shell assembly 40 can be increased.

A first L-shaped cavity 471 is formed at one side of the first cover shell 43 close to the second cover shell 44 in a concave manner from bottom to top, and the first L-shaped cavity 471 is arranged close to the top of the first cover shell 43; a second L-shaped cavity 472 is formed in the second housing 44 by recessing from bottom to top on the side close to the first housing 43, and the second L-shaped cavity 472 is arranged close to the top of the second housing 44; the holding chamber 47 is formed by the combination of the first L-shaped cavity 471 and the second L-shaped cavity 472.

Preferably, the first L-shaped cavity 471 and the second L-shaped cavity 472 are symmetrically arranged left and right relative to a center line of the power head 3, and the first L-shaped cavity 471 and the second L-shaped cavity 472 both adopt a rounded smooth transition to ensure the comfort of holding. The width of the holding 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 80 mm.

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 from the edge of the second L-shaped cavity 472 of the second cover 44. Fixing posts 433 are disposed on the top of the first housing 43 near the protruding rib 431, fixing posts 433 are correspondingly disposed on the top of the second housing 44 near the accommodating groove 441, one of the two fixing posts 433 is a screw hole, and the other fixing post is a screw through hole, so that screws can pass through the two fixing posts 433 to fix the first housing 43 and the second housing 44.

The purpose of providing the fixing posts 433 inside the first and second housings 43 and 44 is to: 1. the first housing 43 and the second housing 44 are fixed inside, so that screws are prevented from being inserted from the outside to influence the waterproof effect of the power head 3; 2. two fixed columns 433 are all wrapped up by upper housing 45 for the outward appearance of unit head 3 is more pleasing to the eye.

Also housed within the housing assembly 40 is a control panel 48 for controlling the motor, located adjacent the battery pack. The control board 48 is provided with two control boards for detecting and controlling the self-propelled motor (not shown) and the main blade motor 32, respectively. One end of the air inlet cavity 42 is connected with the air inlet 41, and the other end extends to the corresponding control panel 48, so as to guide the cooling air flow entering from the air inlet 41 to the control panel 48, and cool and dissipate the heat of the control panel 48.

In order to enhance the cooling effect, a heat dissipation fin 481 is disposed on the control plate 48, and the other end of the air inlet chamber 42 is disposed close to the heat dissipation fin 481. In other words, the air inlet chamber 42 is as close to the heat sink 481 as possible, ensuring that the heat sink 481 is sufficiently cooled. Because two air inlets 41 and two air inlet cavities 42 are arranged, two paths of inlet air are formed, and the control plate 48 and the radiating fins 481 which are positioned at the left side and the right side of the rear end of the battery bin 50 can be respectively cooled.

The motor 32 is located below the control board 48, and when the motor 32 is started, the fan 33 rotates and drives the cooling air flow at the control board 48 to enter the inside of the motor 32, so that the heat generated by the control board 48, the motor 32 and the battery pack is blown to the bottom of the motor base 31 along the inner rotor air gap of the motor 32 and is exhausted from the air outlet 311.

The heat dissipation process: when the motor 32 is started, the fan 33 rotates and generates suction force, external cooling airflow enters from the air inlet 41 and flows into the power head 3 along the air inlet cavity 42 under the action of the suction force of the fan 33, the cooling airflow entering the power head 3 preferentially passes through the control board 48 and the heat radiating fins 481, then flows downwards to the air vents 341 of the air collecting cover 34, enters the motor 32 from the air vents 341, and finally flows out from the air outlet 311 at the bottom of the motor base 31. During the flow of the cooling air flow, the heat inside the battery pack, the control board 48 and the motor 32 is taken away, so that the power head 3 can operate at a relatively stable temperature.

In summary, the motor base 31 of the lawn mower 100 of the present invention is configured to have a closed bottom and the side edge is provided with the air outlet 311, so that when the bottom of the lawn mower 100 is cleaned, water can be prevented from entering the motor base 31 through the air outlet 311. The design of some waterproof structures (such as the waterproof rib 312, the annular groove 12, the water leakage hole 121, the groove 314, the opening 3140, the wool felt 317, the convex rib 431, the accommodating groove 441, the first water retaining extension 432, the second water retaining extension 442 and the third water retaining extension 451) is combined to ensure that the waterproof performance of the mower 100 is optimal.

In addition, by providing the grip cavity 47 at the top rear end of the power head 3, the grip cavity 47 can be used as a rear handle, so that when the mower 100 is carried, the front handle 7 and the rear handle 47 can be directly held by the left hand and the right hand for carrying without adding extra handle parts.

Furthermore, by arranging the air inlet 41 and the air inlet cavity 42 at the rear end of the top of the power head 3, external cooling air flow can enter the power head 3 from the air inlet 41 and the air inlet cavity 42 to take away heat inside the battery pack, the control board 48 and the motor 32, so that the heat dissipation performance of the mower 100 is optimal.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.