Cutting device

Abstract

The utility model relates to the technical field of mower, disclose a cutting device, it includes cutting assembly, motor assembly and heat sink, motor assembly includes cover and motor, and the motor includes motor main body and the motor main shaft of connecting motor main body, and motor main body contains in the cover, be equipped with mounting hole and a plurality of heat dissipation fin that surround the mounting hole on the heat sink, and the motor main shaft passes through the mounting hole and is connected with cutting assembly, in the utility model, through the heat dissipation fin on the heat sink increases the heat dissipation area, and the heat generated by motor main body is transferred to the cover, and is cooled through the heat dissipation fin, improves the heat dissipation of motor main body, and heat sink and the inner wall of cover have the gap, and heat sink and motor main shaft assembly fixed, and synchronous rotation with motor main shaft rotation to drive air flow, improve the heat dissipation of motor main body, thereby improve the heat dissipation effect of motor, avoid the motor overheating and influence the life of motor.

Description

Technical Field

[0001] This utility model relates to the field of lawnmower technology, and in particular to a cutting device. Background Technology

[0002] A lawnmower robot is a mobile robot used to trim lawns, gardens, and other outdoor greenery. Through built-in sensors, navigation systems, and power units, lawnmower robots can automatically plan paths and precisely mow lawns, reducing manual maintenance costs.

[0003] Currently, lawnmower robots cannot trim grass at boundaries such as walls or fences, requiring manual handling by the user, resulting in low efficiency. Related technologies install small cutting devices along the edges of the lawnmower robot to cut the grass at these boundaries. However, because the motor of the cutting device lacks effective heat dissipation within the confined mounting cavity, it is prone to overheating during operation, shortening the usable time per cycle, reducing cutting efficiency, and affecting the motor's lifespan. Utility Model Content

[0004] The purpose of this utility model is to provide a cutting device to solve the technical problem that the poor heat dissipation of the motor in the cutting device leads to the motor overheating and affects the motor life.

[0005] To achieve the above objectives, this utility model provides a cutting device, which includes:

[0006] Cut components;

[0007] A motor assembly includes a housing and a motor, the motor including a motor body and a motor spindle connected to the motor body, the motor body being housed within the housing;

[0008] A heat sink is provided with mounting holes and a plurality of heat sink fins surrounding the mounting holes. The motor spindle passes through the mounting holes and is connected to the cutting assembly.

[0009] In the cutting device of this application, the heat sink has a gap with the inner wall of the housing;

[0010] The cutting device also includes a fastener, which is located at the end of the motor spindle away from the motor body. The fastener is fastened to the motor spindle to secure the heat sink to the motor spindle.

[0011] The cutting assembly is connected to the heat sink.

[0012] In the cutting device of this application, the heat sink is connected to the inner wall of the housing, and the heat sink is thermally conductive.

[0013] In the cutting device of this application, the heat sink is located on the side of the heat sink facing the motor body.

[0014] In the cutting device of this application, the cover includes a first housing and a second housing, the first housing and the second housing are connected to form a first receiving cavity, and the motor body is disposed in the first receiving cavity;

[0015] The second housing has a second receiving cavity formed on the side opposite to the first housing, and the motor spindle extends through the second housing into the second receiving cavity and is fastened to the fastener.

[0016] In the cutting device of this application, the second housing has a protrusion on the side opposite to the first housing. The protrusion extends along the axis of the motor, and the motor spindle passes through the protrusion and is fastened to the fastener.

[0017] In the cutting device of this application, the motor assembly further includes a bearing, which is disposed in the second receiving cavity, and the heat sink is sleeved in the bearing and tightly fitted and fixed to the bearing.

[0018] In the cutting device of this application, the heat sink is provided with an abutment groove on the outer side wall of the bearing, or the bearing is provided with an abutment groove on the inner side wall of the heat sink.

[0019] The motor assembly also includes an abutment ring, which is fitted inside the abutment groove and abuts against the bearing and the heat sink respectively to prevent the heat sink and the bearing from rotating relative to each other.

[0020] In the cutting device of this application, the cutting component is detachably connected to the heat sink.

[0021] In the cutting apparatus of this application, the cutting assembly includes:

[0022] Turntable;

[0023] A movable mechanism is slidably mounted on the turntable;

[0024] A cutting rope, at least in part, is connected to the moving mechanism and extends beyond the turntable to rotate;

[0025] The cutting assembly further includes a first mounting part and a second mounting part. The first mounting part is detachably connected to the heat sink; the second mounting part is detachably connected to the cutting rope. When the moving mechanism is subjected to an external force, it moves relative to the turntable, and during the movement, the first mounting part is disconnected from the heat sink, and the second mounting part is disconnected from the cutting rope.

[0026] This utility model provides a cutting device, the advantages of which are:

[0027] The cutting device of this utility model includes a cutting assembly, a motor assembly, and a heat sink. The motor assembly includes a housing and a motor. The motor body is the main structure of the motor and is assembled inside the housing to drive the motor spindle to rotate. The cutting assembly is connected to the motor spindle and rotates synchronously with it. In this application, the heat sink can be connected to the inner wall of the housing, i.e., the heat sink does not rotate. By setting multiple heat sinks on the heat sink to increase the heat dissipation area, the heat generated by the motor body is transferred to the housing and dissipated through the heat sinks, improving the heat dissipation of the motor body. Alternatively, the heat sink can have a gap with the inner wall of the housing and not be connected to it. The heat sink is assembled and fixed to the motor spindle and rotates synchronously with it, driving airflow and improving the heat dissipation of the motor body, thereby improving the heat dissipation effect of the motor and preventing the motor from overheating and affecting its lifespan. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the cutting device provided in the embodiments of this application;

[0030] Figure 2 An exploded view of the cutting device provided in the embodiments of this application;

[0031] Figure 3 Another exploded view of the cutting device provided in the embodiments of this application;

[0032] Figure 4 for Figure 3 A diagram from another perspective;

[0033] Figure 5 This is a cross-sectional schematic diagram of the cutting device provided in the embodiments of this application;

[0034] Figure 6 Another exploded view of the cutting device provided in the embodiments of this application.

[0035] The markings in the image are as follows:

[0036] 10. Cutting assembly; 11. Turntable; 12. Moving mechanism; 13. Cutting rope; 14. First mounting part; 15. Second mounting part; 20. Motor assembly; 21. Cover; 211. First housing; 212. Second housing; 213. Protrusion; 22. Motor; 221. Motor body; 222. Motor spindle; 23. First receiving cavity; 24. Second receiving cavity; 25. Bearing; 26. Abutment ring; 27. Snap ring; 30. Heat sink; 31. Mounting hole; 32. Heat sink fin; 33. Abutment groove; 34. Mounting groove; 40. Fastener. Detailed Implementation

[0037] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0038] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer" and other terms used in this utility model to indicate the orientation or positional relationship are based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device and components referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0039] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0040] like Figures 1 to 5 As shown, this utility model embodiment provides a cutting device, which includes a cutting assembly 10, a motor assembly 20, and a heat sink 30; the motor assembly 20 includes a housing 21 and a motor 22, the motor 22 includes a motor body 221 and a motor spindle 222 connected to the motor body 221, the motor body 221 is housed in the housing 21; the heat sink 30 is provided with a mounting hole 31 and a plurality of heat sinks 32 surrounding the mounting hole 31, the motor spindle 222 passes through the mounting hole 31 and is connected to the cutting assembly 10.

[0041] In this embodiment, the motor assembly 20 includes a housing 21 and a motor 22. The motor 22 includes a motor body 221 and a motor spindle 222. The motor body 221 is the main structure of the motor 22 and is assembled inside the housing 21 to drive the motor spindle 222 to rotate. The cutting assembly 10 is connected to the motor spindle 222 and can rotate synchronously with the motor spindle 222.

[0042] Based on the above technical solutions, the heat sink 30 can be connected to the inner wall of the housing 21, that is, the heat sink 30 does not rotate. By setting multiple heat sinks 32 on the heat sink 30, the heat dissipation area is increased. The heat generated by the motor body 221 is transferred to the housing 21 and dissipated through the heat sinks 32, thereby improving the heat dissipation of the motor body 221. Alternatively, the heat sink 30 can have a gap with the inner wall of the housing 21 and not be connected to the inner wall of the housing 21. The heat sink 30 is assembled and fixed with the motor spindle 222 and rotates synchronously with the rotation of the motor spindle 222, driving airflow and improving the heat dissipation of the motor body 221, thereby improving the heat dissipation effect of the motor 22 and preventing the motor 22 from overheating and affecting its lifespan.

[0043] The cutting component 10 is directly or indirectly connected to the motor spindle 222 and can rotate synchronously with the motor spindle 222 to achieve the grass cutting function.

[0044] In some embodiments, such as Figures 3 to 5 As shown, the heat sink 30 has a gap with the inner wall of the housing 21; the cutting device also includes a fastener 40, which is located at the end of the motor spindle 222 away from the motor body 221. The fastener 40 is fastened to the motor spindle 222 to fasten the heat sink 30 to the motor spindle 222; the cutting assembly 10 is connected to the heat sink 30.

[0045] In this embodiment, the heat sink 30 is not connected to the inner wall of the housing 21. The motor spindle 222 passes through the mounting hole 31 of the heat sink 30 and is fastened to the fastener 40, thus fixing the heat sink 30 circumferentially on the motor spindle 222. The heat sink 30 rotates with the motor spindle 222, causing the cutting assembly 10 to rotate synchronously, thereby achieving the lawn mowing function. There is a gap between the heat sink 30 and the inner wall of the housing 21; the heat sink 30 is not connected to the housing 21. The rotation of the heat sink 30 with the motor spindle 222 enhances airflow, thereby improving the heat dissipation performance of the motor 22.

[0046] In some embodiments, the outer peripheral surface of the end of the motor spindle 222 away from the motor body 221 is provided with an external thread, and the fastener 40 is a fixing nut. The motor spindle 222 passes through the mounting hole 31 and is threadedly connected to the fixing nut. The fixing nut enables the detachable installation of the heat sink 30 on the motor spindle 222. In this embodiment, the motor spindle 222 and the heat sink 30 are connected by the fastener 40, and the cutting assembly 10 is assembled and connected to the heat sink 30. This is equivalent to the motor spindle 222 being indirectly connected to the cutting assembly 10 through the heat sink 30.

[0047] In some embodiments, the heat sink 30 is connected to the inner wall of the housing 21, and the heat sink 30 is thermally conductive.

[0048] Specifically, the heat sink 30 is directly or indirectly connected to the inner wall of the housing 21. Since the heat sink 30 has thermal conductivity (for example, the heat sink 30 is a metal part), it can achieve thermal connection with the housing 21. The heat sink 30 transfers heat to the housing 21 and then dissipates it outward, thereby improving the heat dissipation performance of the motor 22.

[0049] In some embodiments, such as Figure 4 As shown, the heat sink 32 is located on the side of the heat sink 30 facing the motor body 221.

[0050] Specifically, the heat sink 32 faces the motor body 221. When the heat sink 30 rotates, the heat sink 32 rotates synchronously, and the resulting airflow blows directly onto the motor body 221, enhancing convective heat transfer and improving the heat dissipation of the motor body 221.

[0051] In some embodiments, such as Figures 3 to 5 As shown, the housing 21 includes a first housing 211 and a second housing 212. The first housing 211 is connected to the second housing 212 to form a first receiving cavity 23. The motor body 221 is disposed in the first receiving cavity 23. The second housing 212 has a second receiving cavity 24 formed on the side opposite to the first housing 211. The motor spindle 222 passes through the second housing 212 and extends into the second receiving cavity 24 and is fastened to the fastener 40.

[0052] Specifically, the first housing 211 and the second housing 212 are connected by threads or snaps to form a first receiving cavity 23. The first receiving cavity 23 is the installation space for the motor body 221 and is relatively closed to the outside. The motor body 221 is assembled and fixed in the first receiving cavity 23. The motor spindle 222 passes through the second housing 212 and extends into the second receiving cavity 24. The motor spindle 222 passes through the mounting hole 31 of the heat sink 30 in the second receiving cavity 24 and is fastened to the fastener 40, thus fixing the heat sink 30 around the motor spindle 222. In this embodiment, the heat sink 30 is fixed to the motor spindle 222. The space enclosed by the heat sink 30 and the second housing 212 shields the motor spindle 222, protecting it from grass entering the second receiving cavity 24. This prevents grass from getting tangled on the motor spindle 222 during mowing, increasing the service life of the motor 222.

[0053] In some embodiments, the outer peripheral surface of the end of the motor spindle 222 away from the motor body 221 is provided with an external thread, and the fastener 40 is a fixing nut. The motor spindle 222 passes through the mounting hole 31 and is threadedly connected to the fixing nut. In this embodiment, the heat sink 30 is detachably mounted on the motor spindle 222 by means of the fixing nut.

[0054] In some embodiments, such as Figure 3 and Figure 5As shown, the second housing 212 has a protrusion 213 on the side opposite to the first housing 211. The protrusion 213 extends along the motor axis, and the motor main shaft 222 passes through the protrusion 213 and is fastened to the fastener 40.

[0055] Specifically, the protrusion 213 extends from the end face of the second housing 212 along the axis of the motor. The protrusion 213 has a hollow inner hole extending along the axis of the motor. The two ends of the hollow inner hole are connected to the first receiving cavity 23 and the second receiving cavity 24, respectively. The motor spindle 222 passes through the second housing 212 and the hollow inner hole of the protrusion 213 and is fastened to the fastener 40. The protrusion 213 protects the extended part of the motor spindle 222 and further prevents grass from getting tangled on the motor spindle 222.

[0056] In some embodiments, the heat sink 30 has a mounting groove 34 on the side facing away from the motor body 221, and the mounting groove 34 communicates with the mounting hole 31; wherein, the motor spindle 222 extends through the mounting hole 31 into the mounting groove 34, and the fastener 40 is fastened to the motor spindle 222 in the mounting groove 34.

[0057] Specifically, a mounting groove 34 is provided at the center of the heat sink 30, and a mounting hole 31 is provided on the side of the heat sink 30 near the motor body 221. The mounting groove 34 is located on the side of the heat sink 30 away from the motor body 221. The mounting groove 34 communicates with the mounting hole 31, and the inner diameter of the mounting groove 34 is larger than the inner diameter of the mounting hole 31. Within the mounting groove 34, a fastener 40 is securely connected to the motor spindle 222, effectively protecting the motor spindle 222.

[0058] In some embodiments, such as Figures 3 to 5 As shown, the motor assembly 20 also includes a bearing 25, which is disposed in the second receiving cavity 24. The heat sink 30 is sleeved in the bearing 25 and is tightly fitted and fixed to the bearing 25.

[0059] Specifically, the bearing 25 is assembled within the second receiving cavity 24 and has a gap with the inner wall of the second housing 212. The heat sink 30 is sleeved within the bearing 25 and is tightly fitted and fixed to the bearing 25. When the heat sink 30 rotates with the motor spindle 222, the bearing 25 rotates synchronously with the heat sink 30. In this way, the heat sink 30 rotates relative to the second housing 212 via the bearing 25. The bearing 25 serves to support the heat sink 30 and reduce the coefficient of friction; secondly, the bearing 25 prevents grass from entering the second receiving cavity 24 through the gap between the heat sink 30 and the second housing 212. Thirdly, the bearing 25 also transfers heat through thermal conduction, enhancing heat dissipation performance.

[0060] In some embodiments, oil seal plates are provided on the inner sidewall (i.e. the sidewall close to the motor body 221) and the outer sidewall (i.e. the sidewall away from the motor body 221) of the bearing 25. The oil seal plates can prevent foreign matter from entering the ball rotation space between the inner and outer sidewalls of the bearing 25, thereby affecting the rotation performance of the bearing 25.

[0061] In some embodiments, such as Figure 5 As shown, the heat sink 30 has an abutment groove 33 on the outer side wall facing the bearing 25, or the bearing 25 has an abutment groove 33 on the inner side wall facing the heat sink 30; the motor assembly 20 also includes an abutment ring 26, which is sleeved in the abutment groove 33 and abuts against the bearing 25 and the heat sink 30 respectively to prevent the heat sink 30 and the bearing 25 from rotating relative to each other.

[0062] For example, the heat sink 30 has an abutment groove 33 on the outer side wall facing the bearing 25. The abutment groove 33 is arranged around the outer peripheral wall of the bearing 25. The abutment ring 26 is sleeved in the abutment groove 33 and abuts against the bearing 25 and the heat sink 30 respectively. This increases the friction between the heat sink 30 and the bearing 25, making the connection between the heat sink 30 and the bearing 25 more stable. It prevents the heat sink 30 and the bearing 25 from rotating relative to each other. It also prevents the heat sink 30 from moving relative to the inner side wall of the bearing 25 due to insufficient friction when rotating, thus avoiding wear on the inner side wall of the heat sink 30 or the bearing 25.

[0063] For example, a plurality of abutment grooves 33 surrounding the heat sink 30 are provided on the inner side wall of the bearing 25 facing the heat sink 30. The abutment grooves 33 are columnar or other shaped groove structures, and each abutment groove 33 is equipped with an abutment member, which can also increase the friction between the heat sink 30 and the bearing 25.

[0064] In some embodiments, such as Figure 3 and Figure 4 As shown, the motor assembly 20 also includes a retaining ring 27; the outer peripheral surface of the heat sink 30 away from the motor body 221 is provided with a retaining groove, and the retaining ring 27 is sleeved in the retaining groove to restrict the movement of the bearing 25 toward the side away from the motor body 221.

[0065] Specifically, the retaining ring 27 is fitted into the retaining groove. After installation, the retaining ring 27 can restrict the bearing 25 from moving away from the motor body 221, thus ensuring the installation stability of the bearing 25.

[0066] In some embodiments, the side of the bearing 25 facing the motor body 221 abuts against the inner side of the second housing 212, restricting the movement of the bearing 25 toward the side closer to the motor body 221, thereby further ensuring the installation stability of the bearing 25.

[0067] In some embodiments, such as Figure 2 as well as Figure 3As shown, the cutting assembly 10 is detachably connected to the heat sink 30 to facilitate the removal and replacement of the cutting assembly 10.

[0068] In some embodiments, such as Figure 2 as well as Figure 6 As shown, the cutting assembly 10 includes a turntable 11, a moving mechanism 12, and a cutting rope 13. The moving mechanism 12 is slidably disposed on the turntable 11, allowing the moving mechanism 12 to move relative to the turntable 11. At least a portion of the cutting rope 13 is connected to the moving mechanism 12 and extends beyond the turntable 11 to rotate and cut target objects such as lawns and vegetation under the drive of the turntable 11. The cutting assembly 10 also includes a first mounting part 14 and a second mounting part 15. The first mounting part 14 is detachably connected to the heat sink 30; the second mounting part 15 is detachably connected to the cutting rope 13. When the moving mechanism 12 is subjected to external force, it moves relative to the turntable 11. During the movement, the first mounting part 14 is disconnected from the heat sink 30, allowing the first mounting part 14 to move relative to the heat sink 30, facilitating the disassembly and replacement of the cutting assembly 10. During the movement, the moving mechanism 12 also disconnects the second mounting part 15 from the cutting rope 13, allowing the cutting rope 13 to move freely, facilitating the disassembly and replacement of the cutting rope 13.

[0069] In this embodiment, by using an external force to drive the moving mechanism 12 to move relative to the turntable 11, the first mounting part 14 can be removed from the heat sink 30, thereby removing the cutting assembly 10. The cutting rope 13 can also be removed from the second mounting part 15, simplifying the disassembly of the cutting assembly 10 and the cutting rope 13, thereby reducing disassembly time and improving disassembly efficiency.

[0070] Secondly, this embodiment also provides a lawnmower, including a lawnmower body and a cutting device as described in the above embodiment. The cutting device is installed on the lawnmower body, and when the lawnmower performs lawn mowing operations, the cutting device cuts the grass at the boundary position.

[0071] It should be understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. It should be noted that, herein, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0072] The sequence numbers of the above-described embodiments of this utility model are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above descriptions are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A cutting device, characterized in that, include: Cut components; A motor assembly includes a housing and a motor, the motor including a motor body and a motor spindle connected to the motor body, the motor body being housed within the housing; A heat sink is provided with mounting holes and a plurality of heat sink fins surrounding the mounting holes. The motor spindle passes through the mounting holes and is connected to the cutting assembly.

2. The cutting device of claim 1, wherein, The heat sink has a gap with the inner wall of the housing; The cutting device also includes a fastener, which is located at the end of the motor spindle away from the motor body. The fastener is fastened to the motor spindle to secure the heat sink to the motor spindle. The cutting assembly is connected to the heat sink.

3. The cutting device of claim 1, wherein, The heat sink is connected to the inner wall of the housing, and the heat sink is thermally conductive.

4. The cutting device of claim 2, wherein, The heat sink is located on the side of the heat sink facing the motor body.

5. The cutting device of claim 2, wherein, The cover includes a first housing and a second housing, the first housing and the second housing are connected to form a first receiving cavity, and the motor body is disposed in the first receiving cavity; The second housing has a second receiving cavity formed on the side opposite to the first housing, and the motor spindle extends through the second housing into the second receiving cavity and is fastened to the fastener.

6. The cutting device of claim 5, wherein, The second housing has a protrusion on the side opposite to the first housing. The protrusion extends along the axis of the motor, and the motor spindle passes through the protrusion and is fastened to the fastener.

7. The cutting device of claim 6, wherein, The motor assembly also includes a bearing, which is disposed in the second receiving cavity, and the heat sink is sleeved in the bearing and tightly fitted and fixed to the bearing.

8. The cutting device of claim 7, wherein, The heat sink has an abutment groove on the outer side wall facing the bearing, or the bearing has an abutment groove on the inner side wall facing the heat sink. The motor assembly also includes an abutment ring, which is fitted inside the abutment groove and abuts against the bearing and the heat sink respectively to prevent the heat sink and the bearing from rotating relative to each other.

9. The cutting device of claim 1, wherein, The cutting component is detachably connected to the heat sink.

10. The cutting device of claim 9, wherein, The cutting assembly includes: Turntable; A movable mechanism is slidably mounted on the turntable; A cutting rope, at least in part, is connected to the moving mechanism and extends beyond the turntable to rotate; The cutting assembly further includes a first mounting part and a second mounting part. The first mounting part is detachably connected to the heat sink; the second mounting part is detachably connected to the cutting rope. When the moving mechanism is subjected to an external force, it moves relative to the turntable, and during the movement, the first mounting part is disconnected from the heat sink, and the second mounting part is disconnected from the cutting rope.

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