Gearbox and mower

Abstract

The utility model provides a gearbox and a mower. The gearbox comprises a shell, a gearbox, a cooling pipeline and a liquid storage tank. An accommodating space is formed in the shell, and a mounting platform is arranged on the outer side of the shell; the gear box is mounted in the accommodating space; a pipe body part of the cooling pipeline is arranged on the outer side face of the gearbox in a surrounding mode, and the two ends of the cooling pipeline are fixed to the mounting platform and communicate with the outer side space of the shell; the liquid storage tank is detachably mounted on the mounting platform and used for providing cooling liquid for the cooling pipeline. The technical problems that in the prior art, a natural cooling mode is usually adopted for a gear box of a mower, efficiency is low, heat accumulated in the long-time high-speed rotation work of gears in the gear box is difficult to effectively remove, internal gear parts are subjected to thermal deformation, and the service life of the mower is shortened are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lawn mowers, in particular to a gearbox and a lawn mower. Background Art

[0002] Weeds grow very fast and affect the appearance of the yard, so people need to deal with them regularly. As a device for dealing with weeds, a lawn mower is equipped with a gear box inside to adjust and control the speed and height of the blade, so that the lawn mower can be used in more terrains and better deal with weeds.

[0003] However, there is at least one of the following problems in the related technology: in the prior art, the lawn mower gearbox usually adopts natural cooling, which is inefficient. The heat accumulated in the gears in the gearbox during long-term high-speed rotation is difficult to be effectively removed, causing thermal deformation of the internal gear parts, resulting in a shortened service life of the lawn mower. Utility Model Content

[0004] The technical problem solved by the utility model is that in the prior art, the gear box of the lawn mower usually adopts a natural cooling method, which is inefficient. The heat accumulated in the gears in the gear box during long-term high-speed rotation is difficult to be effectively removed, causing thermal deformation of the internal gear parts, resulting in a shortened service life of the lawn mower.

[0005] In order to solve the above problems, the utility model provides a gearbox, which includes: a shell, a gear box, a cooling pipeline, and a liquid storage tank; a accommodating space is provided inside the shell, and a mounting platform is provided outside the shell; the gear box is installed in the accommodating space; the pipe body part of the cooling pipeline is arranged around the outer side of the gear box, and the two ends of the cooling pipeline are respectively fixed to the mounting platform, and the two ends of the cooling pipeline are respectively connected with the outer space of the shell; the liquid storage tank can be detachably installed on the mounting platform, and the liquid storage tank is used to provide coolant to the cooling pipeline; wherein, an output port and a recovery port are respectively provided on the first side of the liquid storage tank, and when the liquid storage tank is installed on the mounting platform, the output port is matched and connected with one end of the cooling pipeline, and the recovery port is matched and connected with the other end of the cooling pipeline.

[0006] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by surrounding the cooling pipeline on the outer side of the gear box, direct cooling of the gear box is achieved, and the design enables the flow path of the coolant to cover the gear box to the greatest extent, thereby achieving more comprehensive cooling of the gear box, and also improving the efficiency of coolant replacement through the detachable liquid storage tank. In summary, the above technical features effectively improve the cooling efficiency of the gear box, help the gear box maintain an optimal operating temperature, and extend its service life.

[0007] In an example of the present invention, the gearbox includes an intelligent temperature control device, which is used to monitor and control the temperature of the gearbox.

[0008] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: the temperature inside the gearbox is monitored by intelligent control, and the coolant flow rate is adjusted in real time to cool the gearbox, so as to control the temperature inside the gearbox to be constant within an appropriate range.

[0009] In one example of the utility model, the intelligent temperature control device includes a first temperature sensor and a flow rate regulating device. The first temperature sensor is arranged on the inner side of the gear box to detect the temperature inside the gear box; the flow rate regulating device is arranged in the liquid storage tank; wherein the flow rate regulating device adjusts the flow rate of the coolant according to the temperature detected by the first temperature sensor.

[0010] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the first temperature sensor is used to detect the temperature inside the gear box, and sends the detected temperature in the form of a signal to the flow rate regulating device, and the flow rate regulating device adjusts the flow rate of the coolant according to the received signal to control the temperature inside the gear box.

[0011] In one example of the utility model, a second temperature sensor and an alarm device, the second temperature sensor is arranged in the liquid storage tank, and is used to detect the temperature of the coolant; the alarm device is arranged in the shell; wherein, the second temperature sensor detects that the temperature of the coolant in the liquid storage tank exceeds a set threshold, and the alarm device issues an alarm to notify the user to replace the coolant in the liquid storage tank.

[0012] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the second temperature sensor is used to detect the temperature inside the liquid storage tank to detect whether the state of the coolant still has a cooling effect. If it is detected that the temperature of the coolant in the liquid storage tank is higher than the set threshold, it means that the coolant has lost its cooling function and needs to be replaced. At the same time, the alarm device receives a signal that the temperature detected by the second temperature sensor exceeds the set threshold, thereby issuing an alarm to remind the user to replace the coolant.

[0013] In one example of the utility model, the alarm device includes a display screen and a voice broadcast device; the display screen is arranged on the outer side of the shell, and is used to display the real-time temperature of the coolant in the liquid storage tank; the voice broadcast device is arranged in the accommodating space, and is used to provide voice broadcast reminders.

[0014] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the display screen and the voice broadcast device remind the user through the dual linkage of vision and sound, which enhances the user experience and enables the user to more clearly know the information that the coolant or liquid storage tank needs to be replaced, and replace it in time.

[0015] In one example of the utility model, the liquid storage tank includes a water pump, which is arranged in the liquid storage tank, and the output end of the water pump is cooperatively connected with the recovery port to recover the coolant in the cooling pipeline into the liquid storage tank.

[0016] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: when the liquid storage tank is replaced or disassembled, part of the coolant still remains in the cooling pipeline. Before the liquid storage tank is removed from the mounting platform, the coolant in the cooling pipeline is first recovered into the liquid storage tank by a water pump, thereby avoiding large-scale leakage of coolant when the liquid storage tank is removed.

[0017] In one example of the utility model, an elastic snap-fit ​​piece is provided on one side of the mounting platform away from the accommodating space; a buckling portion is provided on the outer side of the liquid storage tank; wherein, when the elastic snap-fit ​​piece and the buckling portion are buckled with each other, the liquid storage tank is fixed to the mounting platform.

[0018] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by prying the elastic clip and cooperating with the buckle part, the liquid storage tank can be installed and fixed on the installation platform, which makes it more convenient to install or disassemble the liquid storage tank.

[0019] In an example of the present invention, the shell is provided with a plurality of ventilation holes, and the ventilation holes communicate the accommodating space with the outside of the shell.

[0020] Compared with the prior art, the technical effect achieved by adopting this technical solution is that natural wind passes through the vents to further cool the inside of the gearbox.

[0021] In one example of the utility model, a first butt joint tube and a second butt joint tube are provided on a first side of a liquid storage tank; one end of the first butt joint tube is fixedly provided at the output port, and the other end of the first butt joint tube extends in a direction away from the first side; one end of the second butt joint tube is fixedly provided at the recovery port, and the other end of the second butt joint tube extends in a direction away from the first side; wherein, when the liquid storage tank is installed on the installation platform, the first butt joint tube is embedded in one end of the cooling pipeline, and the second butt joint tube is sleeved on the other end of the cooling pipeline.

[0022] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the first butt joint pipe and the second butt joint pipe are respectively arranged at the output port and the recovery port, and when the liquid storage tank is installed on the installation platform, the first butt joint pipe and the second butt joint pipe are respectively connected to the two ends of the cooling pipeline accordingly, so that the connection between the output port and the recovery port of the liquid storage tank and the cooling pipeline is more precise, and the first butt joint pipe is slightly smaller than the cooling pipeline, so that the first butt joint pipe is embedded in the cooling pipeline, and the second butt joint pipe is slightly larger than the cooling pipeline, so that the second butt joint pipe is sleeved outside the cooling pipeline to avoid leakage of the coolant due to fast flow rate and high pressure.

[0023] In one example of the present invention, a lawn mower is further provided. The lawn mower comprises a gearbox with any of the above characteristics.

[0024] After adopting the technical solution of the utility model, the following technical effects can be achieved:

[0025] (1) The gearbox is directly cooled by passing coolant through a cooling pipe surrounding the gearbox, thereby achieving a better cooling effect on the gearbox;

[0026] (2) By providing a detachable and replaceable liquid storage tank, the coolant can be replaced more conveniently and quickly;

[0027] (3) By setting up an intelligent temperature control device, the temperature inside the gearbox is monitored in real time, and the flow rate of the coolant is adjusted in real time to control the temperature inside the gearbox within a constant range. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings to be used in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A structural schematic diagram of a lawn mower provided by the utility model;

[0030] Figure 2 for Figure 1 Schematic diagram of the combined structure of the gearbox and cooling pipeline in the gearbox;

[0031] Figure 3 for Figure 1 Schematic diagram of the structure of the lawn mower when the liquid storage tank is removed;

[0032] Figure 4 for Figure 3 The structural diagram of the installation platform at A in the middle;

[0033] Figure 5 for Figure 1 A schematic diagram of the structure of the middle liquid storage tank in one viewing angle;

[0034] Figure 6 for Figure 5 Schematic diagram of the structure of the middle liquid storage tank from another perspective.

[0035] Description of reference numerals:

[0036] 100, lawn mower; 200, gearbox; 201, gear box; 202, cooling circuit; 203, housing; 204, vent; 210, mounting platform; 211, elastic snap fastener; 212, first through hole; 213, second through hole; 300, liquid storage tank; 301, first butt joint; 302, second butt joint; 303, buckle joint; 304, liquid replacement port. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0038] The utility model provides a gearbox 200, which includes: a shell 203, a gear box 201, a cooling pipeline 202, and a liquid storage tank 300; a housing space is provided inside the shell 203, and a mounting platform 210 is provided outside the shell 203; the gear box 201 is installed in the housing space; the pipe body part of the cooling pipeline 202 is arranged around the outer side of the gear box 201, and the two ends of the cooling pipeline 202 are respectively fixed to the mounting platform 210, and the two ends of the cooling pipeline 202 are respectively communicated with the outer space of the shell 203; the liquid storage tank 300 can be detachably installed on the mounting platform 210, and the liquid storage tank 300 is used to provide coolant to the cooling pipeline 202; wherein, an output port and a recovery port are respectively provided on the first side of the liquid storage tank 300, and when the liquid storage tank 300 is installed on the mounting platform 210, the output port is matched and connected with one end of the cooling pipeline 202, and the recovery port is matched and connected with the other end of the cooling pipeline 202.

[0039] like Figure 1 and Figure 2As shown, specifically, the body of the cooling pipeline 202 is in a spiral ring shape and surrounds and fits the outer side of the gear box 201, and the body of the cooling pipeline 202 covers most of the outer side of the gear box 201. The gear box 201 and the cooling pipeline 202 are integrally installed in the accommodating space of the shell 203. The mounting platform 210 is provided with a first through hole 212 and a second through hole 213, and the first through hole 212 and the second through hole 213 are respectively used to pass through the two ends of the cooling pipeline 202, wherein the positions of the first through hole 212 and the second through hole 213 are respectively provided with fixing rings to fix the cooling pipeline 20 2 are fixed on the mounting platform 210; when the first side of the liquid storage tank 300 is fitted with the mounting platform 210, the output port of the liquid storage tank 300 is connected to the first through hole 212 correspondingly, and the recovery port of the liquid storage tank 300 is connected to the second through hole 213 correspondingly. When the liquid storage tank 300 is installed, a closed loop is formed between the liquid storage tank 300 and the cooling pipeline 202, and the coolant in the liquid storage tank 300 is transported to the cooling pipeline 202 through the output port of the liquid storage tank 300, and the coolant in the cooling pipeline 202 is recovered by the recovery port of the liquid storage tank 300 to form a cooling cycle, so as to cool the gear box 201.

[0040] Optionally, the cooling pipeline 202 and the gear box 201 are detachably connected, so that when the gear box 201 fails and needs to be repaired, or when the cooling pipeline 202 needs to be replaced, disassembly is more convenient.

[0041] In an example of the present invention, the gearbox 200 includes an intelligent temperature control device, which is used to monitor and control the temperature of the gearbox 201 .

[0042] Specifically, the intelligent temperature control device includes a control panel, which is arranged on the handle part of the lawn mower 100. The panel is provided with function buttons, which can manually control the activation or adjustment of some functions. The intelligent temperature control system also includes an artificial intelligence detection and judgment part, which can intelligently detect the temperature inside the lawn mower 100, and judge in which set range the detected temperature is, and adjust the temperature of the gear box 201 in the lawn mower 100 according to the command action required to be executed in the range, so as to maintain the temperature of the gear box 201 within the optimal temperature range.

[0043] In one example of the utility model, the intelligent temperature control device includes a first temperature sensor and a flow rate regulating device. The first temperature sensor is arranged on the inner side of the gear box 201 to detect the temperature inside the gear box 201; the flow rate regulating device is arranged in the liquid storage tank 300; wherein the flow rate regulating device adjusts the flow rate of the coolant according to the temperature detected by the first temperature sensor.

[0044] Specifically, the first temperature sensor is arranged on the inner wall of the gear box 201 to more accurately detect the temperature inside the gear box 201, and the first temperature sensor is communicatively connected to the control panel. The first temperature sensor transmits the detected first temperature signal to the control panel. The control panel determines within which preset range the temperature inside the gear box 201 is based on the first temperature signal, and controls the flow rate regulating device according to the corresponding control method to adjust the flow rate of the coolant so that the temperature of the gear box 201 can be kept constant within the optimal temperature range.

[0045] Furthermore, the flow rate regulating device includes a water delivery pump, which is installed inside the liquid storage tank 300, and the output end of the water delivery pump is connected with the output port, so that the length of the pipeline can be reduced and the efficiency of the system can be improved. The motor part of the water delivery pump is arranged outside the liquid storage tank 300 to prevent the motor from being corroded by the coolant. The main function of the water delivery pump is to provide power to extract the coolant from the liquid storage tank 300 and deliver it to the cooling pipeline 202 to ensure that the coolant can circulate effectively in the system. The water delivery pump is connected to the control panel in communication, and the control panel controls the water delivery pump to deliver the coolant in the liquid storage tank 300.

[0046] In one example of the utility model, a second temperature sensor and an alarm device, the second temperature sensor is arranged in the liquid storage tank 300, and is used to detect the temperature of the coolant; the alarm device is arranged in the shell 203; wherein, the second temperature sensor detects that the temperature of the coolant in the liquid storage tank 300 exceeds the set threshold, and the alarm device issues an alarm to notify the user to replace the coolant in the liquid storage tank 300.

[0047] Specifically, the second temperature sensor is communicatively connected to the control panel. When the second temperature sensor sends the detected second temperature signal to the control panel, the control panel determines whether the coolant temperature in the liquid storage tank 300 exceeds the set temperature threshold based on the second temperature signal. If it exceeds the set threshold, the control panel controls the alarm device to sound an alarm to remind the user to replace the coolant or replace the liquid storage tank 300.

[0048] In one example of the present invention, the alarm device includes a display screen and a voice broadcast device; the display screen is arranged on the outer side of the shell 203, and is used to display the real-time temperature of the coolant in the liquid storage tank 300; the voice broadcast device is arranged in the accommodating space, and is used to perform voice broadcast reminders.

[0049] Specifically, the display screen can display the current temperatures detected by the first temperature detector and the second temperature detector; the voice broadcast device includes a speaker, which is arranged in the accommodating space and is located near the display screen. A large number of holes are provided on the shell 203 around the display screen, and the sound-raising structure of the speaker faces the side of the shell 203 where a large number of holes are provided, so that the sound of the loudspeaker is clearer. The display screen and the speaker are linked to provide reminders, so that the user can promptly receive reminders that the coolant needs to be replaced and replace it in time.

[0050] In one example of the present invention, the liquid storage tank 300 includes a water pump, which is disposed in the liquid storage tank 300 , and the output end of the water pump is cooperatively connected with the recovery port to recover the coolant in the cooling pipeline 202 into the liquid storage tank 300 .

[0051] Specifically, the output end of the water pump is arranged in the liquid storage tank 300, the motor part of the water pump is separated from the liquid storage structure part in the water pump, and the control panel is communicated with the water pump. When the control panel receives the removal instruction of the liquid storage tank 300, the water pump is started to extract the coolant in the cooling duct and recycle it into the liquid storage tank 300.

[0052] In one example of the present invention, an elastic snap-fit ​​member 211 is provided on one side of the mounting platform 210 away from the accommodating space; a buckling portion 303 is provided on the outer side of the liquid storage tank 300; wherein, when the elastic snap-fit ​​member 211 and the buckling portion 303 are buckled with each other, the liquid storage tank 300 is fixed to the mounting platform 210.

[0053] like Figure 3 , Figure 4 and Figure 5 As shown, specifically, the elastic snap fastener 211 is arranged on opposite sides of the mounting platform 210, and the corresponding two side snap-in portions 303 of the liquid storage tank 300 are two grooves. When the two side grooves and the elastic snap fastener 211 are snapped with each other, the liquid storage tank 300 is fixedly installed on the mounting platform 210.

[0054] Preferably, a locking device is provided at the bottom of the elastic snap fastener 211, and the locking device is controlled by the control panel. When the locking device is in a locked state, the elastic block snap fastener locks the liquid storage tank 300 on the mounting platform 210 and cannot be disassembled. When the locking device is in an open state, the elastic snap fastener 211 can be separated from the liquid storage tank 300 by manual prying, so that the liquid storage tank 300 can be removed from the mounting platform 210.

[0055] It should be noted that when the liquid storage tank 300 is in a dismantled state, or when the liquid storage tank 300 is installed on the mounting platform 210 but there is no coolant in the cooling pipe 202, the locking device can enter an open state; when there is unrecovered coolant in the cooling pipe 202, the locking device is in a locked state and does not change, so as to avoid coolant leakage.

[0056] In an example of the present invention, the shell 203 is provided with a plurality of ventilation holes 204 , and the ventilation holes 204 communicate with the accommodating space and the outside of the shell 203 .

[0057] In one example of the utility model, a first side of a liquid storage tank 300 is provided with a first docking tube 301 and a second docking tube 302; one end of the first docking tube 301 is fixedly arranged at the output port, and the other end of the first docking tube 301 extends in a direction away from the first side; one end of the second docking tube 302 is fixedly arranged at the recovery port, and the other end of the second docking tube 302 extends in a direction away from the first side; wherein, when the liquid storage tank 300 is installed on the installation platform 210, the first docking tube 301 is embedded in one end of the cooling pipe 202, and the second docking tube 302 is sleeved on the other end of the cooling pipe 202.

[0058] like Figure 6 As shown, specifically, when the liquid storage tank 300 is installed on the mounting platform 210, the first butt joint tube 301 and the second butt joint tube 302 are matched with the sizes of the first through hole 212 and the second through hole 213 respectively, the first butt joint tube 301 is embedded in the first through hole 212, and the tube wall of the first butt joint tube 301 and the tube wall of the first through hole are closely fitted to each other; the second butt joint tube 302 is sleeved on the outside of the second through hole 213, and the tube wall of the second butt joint tube 302 and the tube wall of the second through hole 213 are closely fitted to each other.

[0059] Preferably, a rubber leak-proof sleeve is fixedly provided at one end of the first through hole 212 and the second through hole 213 away from the accommodating space, and when the first butt joint tube 301 and the second butt joint tube 302 are respectively connected to the first through hole 212 and the second through hole 213 and coolant is introduced, leakage of coolant is further prevented.

[0060] Preferably, a liquid replacement port 304 is provided on a side of the liquid storage tank 300 away from the first side for replacing the coolant.

[0061] In an example of the present invention, a lawn mower 100 is further provided. The lawn mower 100 includes a gearbox 200 having any of the above characteristics.

[0062] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

Claims

1. A gearbox, characterized in that: include: A housing (203), wherein a receiving space is provided inside the housing (203), and a mounting platform (210) is provided outside the housing (203); A gear box (201), the gear box (201) being installed in the accommodation space; a cooling pipeline (202), wherein a pipe body portion of the cooling pipeline (202) is disposed around an outer side surface of the gear box (201), two ends of the cooling pipeline (202) are respectively fixed to the mounting platform (210), and the two ends of the cooling pipeline (202) are respectively communicated with an outer space of the housing (203); a liquid storage tank (300), the liquid storage tank (300) being detachably mounted on the mounting platform (210), the liquid storage tank (300) being used to provide cooling liquid to the cooling pipeline (202); The first side of the liquid storage tank (300) is provided with an output port and a recovery port, respectively; when the liquid storage tank (300) is installed on the installation platform (210), the output port is cooperatively connected to one end of the cooling pipeline (202), and the recovery port is cooperatively connected to the other end of the cooling pipeline (202).

2. The gearbox according to claim 1, characterized in that: include: An intelligent temperature control device, the intelligent temperature control device is used to monitor and control the temperature of the gear box (201).

3. The gearbox according to claim 2, characterized in that: The intelligent temperature control device comprises: a first temperature sensor, the first temperature sensor being arranged on an inner side surface of the gear box (201) and being used to detect the temperature inside the gear box (201); A flow rate regulating device, the flow rate regulating device being arranged in the liquid storage tank (300); Wherein, the flow rate regulating device regulates the flow rate of the coolant according to the temperature detected by the first temperature sensor.

4. The gearbox according to claim 2, characterized in that: The intelligent temperature control device also includes: a second temperature sensor, the second temperature sensor being arranged in the liquid storage tank (300) and being used to monitor the temperature of the coolant; an alarm device, the alarm device being arranged on the housing (203); Wherein, when the second temperature sensor detects that the temperature of the coolant in the liquid storage tank (300) exceeds a set threshold, the alarm device issues an alarm to notify a user to replace the coolant in the liquid storage tank (300).

5. The gearbox according to claim 4, characterized in that: The alarm device includes a display screen and a voice broadcast device; The display screen is arranged on the outer side of the housing (203) and is used to display the real-time temperature of the coolant in the liquid storage tank (300); The voice broadcast device is arranged in the accommodating space and is used for performing voice broadcast reminders.

6. The gearbox according to claim 1, characterized in that: The liquid storage tank (300) comprises: A water pump is disposed in the liquid storage tank (300), and an output end of the water pump is cooperatively connected to the recovery port, and is used to recover the coolant in the cooling pipeline (202) into the liquid storage tank (300).

7. The gearbox according to claim 1, characterized in that: An elastic fastener (211) is provided on a side of the mounting platform (210) away from the accommodating space; A buckle connection portion (303) is provided on the outer side of the liquid storage box (300); Wherein, when the elastic fastener (211) and the fastening portion (303) are fastened to each other, the liquid storage tank (300) is fixed to the mounting platform (210).

8. The gearbox according to claim 1, characterized in that: The shell (203) is provided with a plurality of ventilation holes (204), and the ventilation holes (204) communicate with the accommodating space and the outside of the shell (203).

9. The gearbox according to claim 1, characterized in that: The first side of the liquid storage tank (300) is provided with a first butt joint pipe (301) and a second butt joint pipe (302); One end of the first butt joint pipe (301) is fixedly arranged at the output port, and the other end of the first butt joint pipe (301) extends in a direction away from the first side; One end of the second butt joint pipe (302) is fixedly arranged at the recovery port, and the other end of the second butt joint pipe (302) extends in a direction away from the first side; Wherein, when the liquid storage tank (300) is installed on the installation platform (210), the first butt joint pipe (301) is embedded in one end of the cooling pipeline (202), and the second butt joint pipe (302) is sleeved on the other end of the cooling pipeline (202).

10. A lawn mower, characterized in that: The lawn mower (100) comprises the gearbox (200) according to any one of claims 1 to 9.

Images