Power output device and mowing robot

Abstract

The utility model provides a power output device and a mowing robot. The mowing robot comprises a dead knife, a hob and the power output device. The power output device is connected with the dead knife, outputs axial power to adjust an axial gap between the dead knife and the hob, and comprises a driving mechanism, a transmission mechanism and a switching mechanism; the transmission mechanism is connected between the driving mechanism and the conversion mechanism, and the driving mechanism generates steering driving force under the action of current and drives the transmission mechanism to do steering motion; the transmission mechanism is used for reducing speed and increasing torque; and the conversion mechanism is used for converting the steering motion into the axial motion and outputting power in the axial direction, so that the axial gap between the dead knife and the hob is automatically, efficiently and highly-torsionally adjusted, and the experience feeling of a user is favorably improved.

Description

Technical Field

[0001] The present application relates to the technical field of power output devices, and in particular to a power output device and a lawn mowing robot. Background Art

[0002] Currently, some reel-type lawn mower robots have a reel spirally mounted on a drum surface, and a bedknife parallel to the drum. The reel is driven to rotate, drawing grass into the gap between the reel and bedknife. The reel and bedknife then face each other, forming a double-edged pair of scissors that cut the grass in the gap. However, the gap between the bedknife and the reel affects both the cutting quality and the lifespan of the bedknife and reel. Too much of a gap can lead to poor mowing performance, while too little can easily cause collisions between the bedknife and reel, causing blade wear. Current technologies generally rely on manual adjustment of the gap between the bedknife and reel, which results in a suboptimal user experience. Utility Model Content

[0003] To this end, the present application provides a power output device and a lawn mowing robot to solve the above technical problems.

[0004] A first aspect of the present application provides a power output device, which is applied to a lawn mowing robot, wherein the lawn mowing robot includes a bed knife and a roller cutter, and the power output device includes a driving mechanism, a transmission mechanism and a conversion mechanism; the transmission mechanism is connected between the driving mechanism and the conversion mechanism, and the driving mechanism generates a steering driving force under the action of electric current and drives the transmission mechanism to move in a steering direction; the transmission mechanism is used to reduce speed and increase torque; the conversion mechanism is used to convert the steering motion into axial motion and output power in the axial direction to adjust the axial gap between the bed knife and the roller cutter.

[0005] A second aspect of the present application provides a lawn mowing robot, which includes a bed knife, a roller cutter and the aforementioned power output device; the power output device is connected to the bed knife, and the power output device is used to output power in the axial direction to adjust the axial gap between the bed knife and the roller cutter.

[0006] In the present application, the power output device includes a drive mechanism, a transmission mechanism, and a conversion mechanism. The drive mechanism generates a steering drive force, and the transmission mechanism performs a steering motion under the action of the drive force. The steering motion is converted into axial motion by the conversion mechanism, and ultimately outputs power in the axial direction. This structure, through multi-stage energy conversion, can effectively convert current into axial output power, improving energy utilization. At the same time, the transmission mechanism is used to reduce speed and increase torque, which can achieve matching of input and output speeds while increasing output torque, thereby enhancing the power output capacity of the power output device. The power output device is connected to the bed cutter and outputs axial power to adjust the axial gap between the bed cutter and the hob. This achieves automated, efficient, and high-torque adjustment of the axial gap between the bed cutter and the hob, which is beneficial to improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0008] Figure 1 A schematic diagram of a portion of the structure of a lawn mowing robot provided in some embodiments of the present application;

[0009] Figure 2 for Figure 1 Structural explosion diagram;

[0010] Figure 3 for Figure 1 Side view of the mid-structure;

[0011] Figure 4 A schematic structural diagram of a power output device provided in some embodiments of the present application;

[0012] Figure 5 for Figure 4 Structural explosion diagram;

[0013] Figure 6 for Figure 5 An exploded and enlarged view of the middle structure;

[0014] Figure 7 for Figure 4 Projection diagram from the first perspective;

[0015] Figure 8 For the Figure 7 Cross-sectional view of the section taken in the middle BB;

[0016] Figure 9A schematic diagram showing one side of a threaded rod abutting against a threaded hole provided in some embodiments of the present application. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] In the description of this application, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a direct connection, an indirect connection through an intermediate medium, or internal communication between two components; it can mean a communication connection; or it can mean an electrical connection. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0019] In the description of this application, the terms "first", "second", "third", etc. are used to distinguish different objects rather than to describe a specific order. In addition, the terms "upper", "lower", "inner", "outer", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on this application.

[0020] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] Please refer to Figure 1 , Figure 1 A schematic diagram of a portion of the structure of a lawn mowing robot provided in some embodiments of the present application; Figure 2 for Figure 1 Structural explosion diagram; Figure 3 for Figure 1 Side view of the structure.

[0022] like Figure 1 and Figure 2As shown, in some embodiments, the lawn mowing robot 100 includes a power output device 1, a bed knife 2 and a reel 3; the power output device 1 is connected to the bed knife 2, and the power output device 1 is used to output power to adjust the gap between the bed knife 2 and the reel 3.

[0023] In some embodiments, such as Figure 1-Figure 3 As shown, the lawn mowing robot 100 also includes a support frame 4, a roller 5, a reel bracket 6, a bottom blade bracket 7 and a first connecting member 8. The support frame 4 includes a first supporting member 401 and a second supporting member 402 that are arranged opposite to each other. The roller 5 is located between the first supporting member 401 and the second supporting member 402, and the two ends of the roller 5 are respectively connected to the first supporting member 401 and the second supporting member 402, and can rotate relative to the first supporting member 401 and the second supporting member 402. The reel bracket 6 is arranged on the roller 5, and the reel 3 is arranged on the reel bracket 6. The reel 3 is spirally arranged relative to the roller 5, and the reel 3 moves along with the roller 5 rotates, the bed knife bracket 7 is located between the first support member 401 and the second support member 402, and the two ends of the bed knife bracket 7 are respectively connected to the first support member 401 and the second support member 402, the bed knife 2 is provided on the bed knife bracket 7, the first connecting member 8 connects the bed knife bracket 7 and the power output device 1, when the power output device 1 outputs power, it pushes the first connecting member 8, thereby pushing the bed knife bracket 7 and the bed knife 2 close to the hob 3, or pulls the first connecting member 8, thereby pulling the bed knife bracket 7 and the bed knife 2 away from the hob 3, thereby adjusting the axial gap between the hob 3 and the bed knife 2.

[0024] Among them, the axial gap refers to the gap in the axial direction. It should be noted that the vertical gap when the blades of the hob 3 and the bed cutter 2 are at the shortest distance can be the axial gap or a different gap. When the axial gap is changed, the vertical gap is also changed accordingly.

[0025] Please refer to Figure 4-Figure 6 , Figure 4 A schematic structural diagram of a power output device provided in some embodiments of the present application; Figure 5 for Figure 4 Structural explosion diagram; Figure 6 for Figure 5 An exploded and enlarged view of the middle part of the structure.

[0026] like Figure 4-Figure 6As shown, in some embodiments, the power output device 1 includes a driving mechanism 10, a transmission mechanism 20 and a conversion mechanism 30; the transmission mechanism 20 is connected between the driving mechanism 10 and the conversion mechanism 30, and the driving mechanism 10 generates a steering driving force under the action of electric current and drives the transmission mechanism 20 to turn; the transmission mechanism 20 is used to reduce speed and increase torque; the conversion mechanism 30 is used to convert the steering motion into axial motion and output power in the axial direction A to adjust the axial gap between the bed cutter 2 and the hob 3.

[0027] In the present application, the power output device 1 includes a drive mechanism 10, a transmission mechanism 20, and a conversion mechanism 30. The drive mechanism 10 generates a steering driving force, and the transmission mechanism 20 performs a steering motion under the action of the driving force. The steering motion is converted into an axial motion by the conversion mechanism 30, and finally the axial A output power is realized. This structure can effectively convert the current into the axial A output power through multi-stage energy conversion, thereby improving the energy utilization rate. At the same time, the transmission mechanism 20 is used to reduce the speed and increase the torque, which can achieve the matching of the input and output speeds and increase the output torque, thereby enhancing the power output capacity of the power output device 1. The power output device 1 is connected to the bottom cutter, and the axial output power adjusts the axial gap between the bottom cutter 2 and the hob 3, thereby realizing automated, efficient, and high-torque adjustment of the axial gap between the bottom cutter 2 and the hob 3, which is conducive to improving the user experience.

[0028] In some embodiments, such as Figure 5As shown, the power output device 1 also includes an outer shell 40, an inner shell 41, a first cover 42, a second cover 43, a first circuit board 44, a second circuit board 45 and a power supply harness 46; the first cover 42 is covered on the outer shell 40 to form a receiving cavity (not marked) to accommodate the drive mechanism 10, the transmission mechanism 20, the conversion mechanism 30, the inner shell 41, the second cover 43, the first circuit board 44, the second circuit board 45 and part of the power supply harness 46; the drive mechanism 10, the transmission mechanism 20 and the conversion mechanism 30 are arranged in the inner shell 41, and the second cover 43 is covered on the transmission mechanism 20 away from the conversion mechanism 30 One end is connected to the inner housing 41. The first circuit board 44 and the second circuit board 45 are both connected to the inner housing 41. The power supply harness 46 extends from the outer housing 40 into the receiving cavity and is connected to the first circuit board 44, the second circuit board 45, and the drive mechanism 10, thereby transmitting current to the first circuit board 44, the second circuit board 45, and the drive mechanism 10. The power supply harness 46 and the first circuit board 44, the second circuit board 45, and the drive mechanism 10 can be directly or indirectly connected. When the connection is indirect, the first circuit board 44, the second circuit board 45, and the drive mechanism 10 can be interconnected. As a result, the power output device 1 has a more compact and complete structure and is more convenient to be set on the lawn mower robot 100.

[0029] In some embodiments, such as Figure 6 As shown, the conversion mechanism 30 includes a threaded rod 31, an adapter 32 and a first output shaft 34; the threaded rod 31 is connected to the transmission mechanism 20, and the threaded rod 31 rotates with the steering movement of the transmission mechanism 20; a threaded hole 321 is provided in the adapter 32, and the adapter 32 is sleeved on the threaded rod 31 through the threaded hole 321, the linear motion of the threaded rod 31 in the axial direction is restricted and the threaded rod 31 can rotate in the axial direction, and the adapter 32 performs linear motion along the axial direction when the threaded rod 31 rotates along its axial direction; the first output shaft 34 is fixedly connected to the adapter 32, and the extension direction of the first output shaft 34 is in the same direction as the extension direction of the threaded rod 31, and the first output shaft 34 performs linear motion along the axial direction with the adapter 32.

[0030] The conversion mechanism 30 converts the axial rotational motion of the transmission mechanism 20 into linear motion along the axial direction A through the coordinated action of the threaded rod 31 and the adapter 32. This structure effectively converts the direction of motion so that power can be output in a specific direction.

[0031] The threaded rod 31 may be a screw rod or a threaded rod. The threaded hole 321 is an internal thread structure.

[0032] Wherein, the first output shaft 34 extends from the opening of the outer shell 40 and is connected to the first connecting member 8. Under the drive of the transmission mechanism 20, when the threaded rod 31 rotates in the first direction, the adapter 32 moves in the axial direction A to push the first connecting member 8, thereby pushing the bed knife bracket 7 and the bed knife 2 close to the hob 3, so that the gap between the bed knife 2 and the hob 3 becomes smaller; under the drive of the transmission mechanism 20, when the threaded rod 31 rotates in the second direction, the adapter 32 moves in the opposite direction of the axial direction A to pull the first connecting member 8, thereby pulling the bed knife bracket 7 and the bed knife 2 away from the hob 3, so that the gap between the bed knife 2 and the hob 3 becomes larger, thereby achieving the adjustment of the gap between the hob 3 and the bed knife 2.

[0033] The first direction may be clockwise or counterclockwise. When the first direction is clockwise, the second direction is counterclockwise; when the first direction is counterclockwise, the second direction is clockwise.

[0034] Please refer to Figure 6-Figure 8 , Figure 7 for Figure 4 Projection diagram from the first perspective; Figure 8 For the Figure 7 Cross-sectional view of the section taken through BB.

[0035] In some embodiments, such as Figure 6 As shown, the conversion mechanism 30 further includes a bearing 33 , and at least one end of the threaded rod 31 is sleeved with the bearing 33 .

[0036] When the linear motion of the threaded rod 31 in the axial direction A is restricted, the threaded rod 31 will abut against the corresponding components and be subjected to friction when rotating. Compared with the friction between the two ends of the threaded rod 31 directly and the wall of the receiving hole set in the shell, the friction force on the threaded rod 31 is greater. At least one end of the threaded rod 31 is sleeved with the bearing 33, which can convert the friction with the wall of the receiving hole into rolling friction, thereby reducing the friction force on the threaded rod 31. The friction with the wall of the receiving hole is surface friction. After at least one end of the threaded rod 31 is sleeved with the bearing 33, the threaded rod 31 is fixed to the inner ring of the bearing 33, and the outer ring of the bearing 33 can cooperate with a fixing part such as a shell. Balls are provided between the inner and outer rings of the bearing 33, so that the inner and outer rings of the bearing 33 are in rolling friction, thereby reducing the friction force on the threaded rod 31.

[0037] In some embodiments, such as Figure 6-Figure 8 As shown, the bearing 33 includes a deep groove ball bearing 331 and an oil-containing bearing 332; the deep groove ball bearing 331 is arranged at one end of the threaded rod 31 close to the transmission mechanism 20, and the deep groove ball bearing 331 is used to limit the axial movement of the threaded rod 31; the oil-containing bearing 332 is arranged at one end of the threaded rod 31 away from the transmission mechanism 20, and the oil-containing bearing 332 is used to support the threaded rod 31.

[0038] Because the deep groove ball bearing 331 can withstand both large radial loads and certain axial loads, and has relatively small axial and working clearances, it is positioned at the end of the threaded rod 31 closest to the transmission mechanism 20 and used to restrict the threaded rod 31 from linear motion along the axial direction A, thereby ensuring greater stability and precision in motion. Furthermore, because the cost of the oil-containing bearing 332 is lower than that of the deep groove ball bearing 331, if the bearing positioned at the end of the threaded rod 31 away from the transmission mechanism 20 is primarily used to support the threaded rod 31, selecting the oil-containing bearing 332 positioned at the end of the threaded rod 31 away from the transmission mechanism 20 can lower the overall structural cost. In other embodiments, the deep groove ball bearing 331 can also be positioned at the end of the threaded rod 31 away from the transmission mechanism 20 to support the threaded rod 31.

[0039] The inner housing 41 may be provided with a receiving hole, and the deep groove ball bearing 331 and the oil-containing bearing 332 may be installed in the receiving hole and connected to the receiving hole by interference fit, snap connection, or the like.

[0040] In some embodiments, two deep groove ball bearings 331 are provided at the end of the threaded rod 31 near the transmission mechanism 20 . Compared to providing only one deep groove ball bearing 331 , this can increase the axial load on the threaded rod 31 and further restrict the movement of the threaded rod 31 along the axial direction A. In other embodiments, other numbers of deep groove ball bearings 331 can be provided at the end of the threaded rod 31 near the transmission mechanism 20 , and this is not limited here.

[0041] Please refer to Figure 6 and Figure 9 , Figure 9 A schematic diagram showing one side of a threaded rod abutting against a threaded hole provided in some embodiments of the present application.

[0042] In some embodiments, such as Figure 6 and Figure 9As shown, the conversion mechanism 30 also includes an elastic member 35, one end of the first output shaft 34 is fixed to the adapter 32, the first output shaft 34 includes a shaft body portion 341 and a protrusion 342, the protrusion 342 is located on the shaft body portion 341, the elastic member 35 is sleeved on the first output shaft 34, and the elastic member 35 is located between the adapter 32 and the protrusion 342 and is in a compressed state. When the first output shaft 34 moves along the axial direction A, the elastic member 35 applies an elastic force to the adapter 32 in the opposite direction of the movement, so that one side of the threaded rod 31 abuts against the threaded hole 321.

[0043] The screw thread 321 of the embodiment of the present invention is a screw thread, and the ... When the first output shaft 34 moves along the axial direction A, the elastic member 35 applies an elastic force to the adapter 32 in the opposite direction of the movement, so that one side of the threaded rod 31 abuts against the threaded hole 321, thereby preventing the hole thread in the threaded hole 321 from moving in the rod thread that cooperates with the hole thread in the threaded rod 31, so that the movement distance of the threaded hole 321 relative to the threaded rod 31 is a preset movement distance, and then the adapter 32 drives the first output shaft 34 to move a preset movement distance, thereby improving the accuracy of the conversion mechanism 30, and then the power output device 1 outputs power in the axial direction A to move the bed knife 2, and the gap between the bed knife 2 and the hob 3 can be more accurately adjusted to the target gap.

[0044] One end of the first output shaft 34 can be fixed to the adapter 32 by, but not limited to, interference fit, bolt and nut fit, gluing, welding, or the like.

[0045] In some embodiments, the adapter 32 is further provided with an adapter shaft hole 322 , and the first output shaft 34 is passed through the adapter shaft hole 322 and fixed to the adapter 32 .

[0046] In some embodiments, such as Figure 5 and Figure 6 As shown, the power output device 1 further includes an angle sensor 50 , which is disposed near the end of the threaded rod 31 . The angle sensor 50 is used to detect the rotation angle of the threaded rod 31 to determine the telescopic distance of the first output shaft 34 .

[0047] Since the driving mechanism 10 may not rotate the number of revolutions in accordance with the preset number of revolutions, the rotation angle of the threaded rod 31 is detected by the angle sensor 50. Even if the driving mechanism 10 may not rotate the number of revolutions in accordance with the preset number of revolutions, it will not affect the determination of the number of revolutions of the threaded rod 31, thereby accurately controlling the extension and retraction distance of the first output shaft 34, and further more accurately adjusting the gap between the bed cutter 2 and the roller cutter 3 to the target gap.

[0048] In some embodiments, the transmission mechanism 20 is a gear mechanism having a single-stage reduction or a multi-stage reduction.

[0049] Since the gear mechanism has the advantages of efficient transmission, strong load capacity, simple structure, high transmission efficiency, smooth transmission and long service life, the gear mechanism is selected as the transmission mechanism 20, and the gear mechanism has a single-stage reduction or a multi-stage reduction, which can stably enhance the output torque.

[0050] In some embodiments, such as Figure 6 As shown, the driving mechanism 10 is a motor, which includes a second output shaft 11, and the gear mechanism includes four stages of reduction. The gear mechanism includes a first-stage reduction gear set 21, a second-stage reduction gear set 22, a third-stage reduction gear set 23 and a fourth-stage reduction gear set 24, wherein each reduction gear set includes a large gear and a small gear that are meshed with each other, and the large gear of the first-stage reduction gear set 21 is coaxially arranged with the small gear of the second-stage reduction gear set 22; the large gear of the second-stage reduction gear set 22 is coaxially arranged with the small gear of the third-stage reduction gear set 23; the large gear of the third-stage reduction gear set 23 is coaxially arranged with the small gear of the fourth-stage reduction gear set 24; the large gear of the fourth-stage reduction gear set 24 is sleeved on the threaded rod 31; the small gear of the first-stage reduction gear set 21 is sleeved on the second output shaft 11.

[0051] Therefore, the gear mechanism can achieve four-stage speed regulation to increase the output torque.

[0052] Wherein, the motor may be a stepper motor, and the stepper motor controls the rotation angle by pulses, which facilitates the control of the rotation angle. In other embodiments, the motor may also be other motors.

[0053] In some embodiments, the threaded rod 31 is fixedly connected to the gear mechanism via a second connecting member 310 .

[0054] Specifically, the large gear of the four-stage reduction gear set 24 is fixedly connected to the threaded rod 31 via a second connecting member 310 .

[0055] The area of ​​the second connecting member 310 projected onto the large gear of the four-stage reduction gear set 24 on a side away from the threaded rod 31 is larger than the gear hole area of ​​the gear.

[0056] Therefore, it is possible to prevent the large gear of the four-stage reduction gear set 24 from being loosened from the threaded rod 31 , which would result in the inability to drive the threaded rod 31 to rotate.

[0057] In some embodiments, such as Figure 6 As shown, the power output device 1 further includes a guide mechanism 60 ; the extending direction of the guide mechanism 60 is the same as the extending direction of the first output shaft 34 ; the guide mechanism 60 is used to guide the adapter 32 .

[0058] Therefore, the first output shaft 34 can output power in the guided direction to adjust the gap between the bed knife 2 and the roller cutter 3 .

[0059] In some embodiments, such as Figure 6 As shown, the guide mechanism 60 also includes a first guide member 61 and a second guide member 62; the first guide member 61 and the second guide member 62 are both parallel to the extension direction of the threaded rod 31; the threaded rod 31 and the first output shaft 34 are located between the first guide member 61 and the second guide member 62; the adapter 32 is also provided with a first guide shaft hole 323 and a second guide shaft hole 324, the first guide member 61 passes through the first guide shaft hole 323, and both ends are fixed, the second guide member 62 passes through the second guide shaft hole 324 and both ends are fixed; when the threaded rod 31 turns, the adapter 32 makes a linear motion along the axial direction A under the guidance of the first guide member 61 and the second guide member 62.

[0060] Compared with the guide mechanism 60 which has only one guide member, the guide mechanism 60 includes a first guide member 61 and a second guide member 62, and the threaded rod 31 and the first output shaft 34 are located between the first guide member 61 and the second guide member 62. The adapter 32 is also provided with a first guide shaft hole 323 and a second guide shaft hole 324. The first guide member 61 passes through the first guide shaft hole 323 and is fixed at both ends. The second guide member 62 passes through the second guide shaft hole 324 and is fixed at both ends. The contact area between the adapter 32 and the first guide member 61 and the second guide member 62 is larger, which can make the overall balance of the adapter 32 better. The first guide member 61 and the second guide member 62 have higher guiding accuracy for the adapter 32, and at the same time improve the stability of the linear motion of the adapter 32 in the axial direction A.

[0061] Among them, by arranging the threaded hole 321, the adapter shaft hole 322, the first guide shaft hole 323 and the second guide shaft hole 324 in the adapter 32 and connecting them with the threaded rod 31, the first output shaft 34, the first guide member 61 and the second guide member 62, the axial rotational motion of the transmission mechanism 20 is converted into axial linear motion, and the first output shaft 34 is output along the axial direction A under the guidance of the first guide member 61 and the second guide member 62, the structure is simple and the integration is high.

[0062] In some embodiments, such as Figure 6 and Figure 8 As shown, the guide mechanism 60 also includes a clamping member 63, and an annular groove (610, 620) is provided on the first guide member 61 and the second guide member 62. The clamping member 63 is fixed on the inner shell 41, and the clamping member 63 is clamped in the annular groove (610, 620), thereby achieving the fixation of the first guide member 61 and the second guide member 62.

[0063] The above is an implementation method of the embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A power output device, applied to a lawn mowing robot, the lawn mowing robot comprising a bed knife and a reel, characterized in that: The power output device includes a driving mechanism, a transmission mechanism and a conversion mechanism; The transmission mechanism is connected between the driving mechanism and the conversion mechanism, and the driving mechanism generates a steering driving force under the action of electric current and drives the transmission mechanism to move in a steering manner; The transmission mechanism is used to reduce speed and increase torque; The conversion mechanism is used to convert the steering motion into the axial motion and output power in the axial direction to adjust the axial gap between the bed knife and the roller cutter.

2. The power output device according to claim 1, characterized in that: The conversion mechanism includes a threaded rod, an adapter, a bearing and a first output shaft; The threaded rod is connected to the transmission mechanism, and the threaded rod rotates along with the rotation of the transmission mechanism; The adapter is provided with a threaded hole, and the adapter is sleeved on the threaded rod through the threaded hole. The threaded rod is restricted in linear motion in the axial direction and can rotate in the axial direction. When the threaded rod rotates along its axial direction, the adapter performs linear motion along the axial direction. The first output shaft is fixedly connected to the adapter, and an extension direction of the first output shaft is the same as an extension direction of the threaded rod. The first output shaft moves linearly along the axial direction with the adapter.

3. The power output device according to claim 2, characterized in that: The conversion mechanism further comprises a bearing, and at least one end of the threaded rod is sleeved with the bearing.

4. The power output device according to claim 3, characterized in that: The bearings include deep groove ball bearings and oil-containing bearings; The deep groove ball bearing is arranged at one end of the threaded rod close to the transmission mechanism, and the deep groove ball bearing is used to limit the axial movement of the threaded rod; The oil-containing bearing is arranged at one end of the threaded rod away from the transmission mechanism, and the oil-containing bearing is used to support the threaded rod.

5. The power output device according to claim 2, characterized in that: The conversion mechanism also includes an elastic member, one end of the first output shaft is fixed to the adapter, the first output shaft includes a shaft body and a protrusion, the protrusion is located on the shaft body, the elastic member is sleeved on the first output shaft, and the elastic member is located between the adapter and the protrusion and is in a compressed state. When the first output shaft moves axially, the elastic member applies an elastic force opposite to the direction of movement to the adapter, so that one side of the threaded rod abuts against the threaded hole.

6. The power output device according to claim 2, characterized in that: The power output device further includes an angle sensor, which is disposed near an end of the threaded rod and is configured to detect a rotation angle of the threaded rod to determine a telescopic distance of the first output shaft.

7. The power output device according to claim 2, characterized in that: The transmission mechanism is a gear mechanism, and the gear mechanism has a single-stage reduction or a multi-stage reduction.

8. The power output device according to claim 7, characterized in that: The driving mechanism is a motor, which includes a second output shaft. The gear mechanism has four stages of reduction, and the gear mechanism includes a first-stage reduction gear set, a second-stage reduction gear set, a third-stage reduction gear set and a fourth-stage reduction gear set, wherein each reduction gear set includes a large gear and a small gear that are meshed with each other, and the large gear of the first-stage reduction gear set is coaxially arranged with the small gear of the second-stage reduction gear set; the large gear of the second-stage reduction gear set is coaxially arranged with the small gear of the third-stage reduction gear set; the large gear of the third-stage reduction gear set is coaxially arranged with the small gear of the fourth-stage reduction gear set; the large gear of the fourth-stage reduction gear set is sleeved on the threaded rod; and the small gear of the first-stage reduction gear set is sleeved on the second output shaft.

9. The power output device according to claim 8, characterized in that: The threaded rod is fixedly connected to the gear mechanism via a connecting piece.

10. The power output device according to claim 2, characterized in that: The power output device further includes a guide mechanism; The extending direction of the guide mechanism is the same as the extending direction of the first output shaft; The guiding mechanism is used to guide the adapter.

11. The power output device according to claim 10, characterized in that: The guide mechanism further includes a first guide member and a second guide member; The first guide member and the second guide member are both parallel to the extension direction of the threaded rod; The threaded rod and the output shaft are located between the first guide member and the second guide member; The adapter is further provided with a first guide shaft hole and a second guide shaft hole, the first guide member passes through the first guide shaft hole and is fixed, and the second guide member passes through the second guide shaft hole and is fixed; When the threaded rod rotates, the adapter moves axially under the guidance of the first guide member and the second guide member.

12. A lawn mowing robot, characterized in that: The lawn mowing robot includes a bed knife, a roller cutter, and a power output device according to any one of claims 1 to 11; the power output device is connected to the bed knife, and the power output device is used to output power in the axial direction to adjust the axial gap between the bed knife and the roller cutter.

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