A lawn mower

Abstract

The present invention provides a lawn mower, comprising: a housing; a cutter assembly; a driving assembly, wherein the driving assembly comprises a prime mover and a transmission mechanism; the transmission mechanism comprises a transmission rod matched with the prime mover and a transmission shaft slidably mounted on the transmission rod and rotatable under the drive of the transmission rod, and the cutter assembly is mounted on one end of the transmission shaft away from the transmission rod; and a height adjustment assembly, wherein the height adjustment assembly comprises a height adjustment rod driving the transmission shaft to slide along the transmission rod and a height adjustment knob matched with the height adjustment rod; the height adjustment rod is provided with a first driving tooth, and the height adjustment knob is provided with a second driving tooth; when the height adjustment knob is in a first state, the first driving tooth and the second driving tooth are meshed; when the height adjustment knob is in a second state, the first driving tooth and the second driving tooth are disengaged. Compared with the prior art, the lawn mower of the present invention controls the operation of the height adjustment rod by whether the first driving tooth and the second driving tooth are meshed or not, and has a simple structure and high reliability.

Description

Technical Field

[0001] The invention relates to a lawn mower, in particular to a lawn mower capable of adjusting the grass cutting height. Background Art

[0002] A lawn mower is a mechanical tool used to trim lawns, vegetation, etc. It can effectively improve the weeding efficiency of workers and reduce the labor intensity of workers. However, different users have different requirements for lawn height. To this end, R&D personnel designed a lawn mower that can adjust the mowing height so that users can freely choose the mowing height.

[0003] At present, a lawn mower with a height adjustment system usually includes a motor, a cutter disc fixedly mounted on the motor output shaft, and a height adjustment mechanism that drives the motor to move up and down. When adjusting the mowing height, the motor is driven up and down by the height adjustment mechanism, thereby driving the cutter disc mounted on the output shaft to move to adjust the height of the cutter disc from the ground, thereby achieving the purpose of adjusting the mowing height. Since the height adjustment mechanism drives the motor to move up and down, and the motor is relatively heavy, it is more laborious for the user to adjust the mowing height. In addition, since the motor is relatively heavy, the height adjustment mechanism is easily damaged. In addition, since the height adjustment mechanism drives the motor and the cutter disc to move together, the lawn mower needs to reserve a large space to move the motor and the cutter disc. In this way, the overall volume of the lawn mower is larger, thereby increasing the manufacturing, packaging, and transportation costs of the lawn mower.

[0004] In view of the above problems, it is necessary to provide a new lawn mower to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a lawn mower, which can directly adjust the height of a cutting blade assembly from the ground through a height adjustment component without adjusting the position of a bulky motor, thereby reducing the bearing capacity of the height adjustment component and making the height adjustment component less susceptible to damage; and such a setting can effectively reduce the overall volume of the lawn mower, thereby reducing the manufacturing, packaging and transportation costs of the lawn mower; in addition, the height adjustment component controls the operation of the height adjustment rod by whether the first drive tooth and the second drive tooth are engaged or not, and has a simple structure and high reliability.

[0006] To achieve the above-mentioned object, the present invention provides a lawn mower, comprising: a housing; a cutter assembly, the cutter assembly being movable in a direction perpendicular to a working plane; a driving assembly, the driving assembly comprising a prime mover fixedly mounted on the housing and a transmission mechanism for transmitting power outputted by the prime mover to the cutter assembly; the transmission mechanism comprising a transmission rod matched with the prime mover and a transmission shaft slidably mounted on the transmission rod and rotatable under the drive of the transmission rod, the cutter assembly being mounted on an end of the transmission shaft away from the transmission rod; and a height adjustment assembly, the height adjustment assembly comprising a height adjustment rod for driving the transmission shaft to slide along the transmission rod and a height adjustment knob matched with the height adjustment rod; the height adjustment rod is provided with a first driving tooth, and the height adjustment knob is provided with a second driving tooth matched with the first driving tooth; when the height adjustment knob is in a first state, the first driving tooth and the second driving tooth are meshed with each other, so that the height adjustment knob drives the height adjustment rod to work; when the height adjustment knob is in a second state, the first driving tooth and the second driving tooth are out of contact.

[0007] As a further improvement of the present invention, the height adjustment knob is slidably mounted on the shell and can slide along the axial direction of the height adjustment rod; when the height adjustment knob is pushed toward the height adjustment rod, the height adjustment knob slides toward the height adjustment rod and resists the height adjustment rod, so that the first drive tooth and the second drive tooth are engaged; when the height adjustment knob is pushed in a direction away from the height adjustment rod, the first drive tooth and the second drive tooth are disengaged.

[0008] As a further improvement of the present invention, the height adjustment component also includes a first elastic element that cooperates with the height adjustment knob; when the height adjustment knob is pushed toward the height adjustment rod, the first elastic element undergoes elastic deformation; when the height adjustment knob is released, the first elastic element pushes the height adjustment knob to reset.

[0009] As a further improvement of the present invention, the transmission rod is provided with a through slot which penetrates the transmission rod along the axial direction of the transmission shaft; one end of the height adjustment rod cooperates with the transmission shaft, and the other end passes through the through slot and protrudes out of the through slot to cooperate with the height adjustment knob.

[0010] As a further improvement of the present invention, the prime mover has an output shaft and an output wheel mounted on the output shaft; the transmission rod is provided with a transmission wheel matching the output wheel; a first locking tooth is provided on the side of the transmission wheel facing the height adjustment knob; the height adjustment assembly also includes a locking knob matching the transmission wheel, and the locking knob is provided with a second locking tooth matching the first locking tooth; when the locking knob is in a first state, the first locking tooth and the second locking tooth are engaged to lock the transmission wheel; when the locking knob is in a second state, the first locking tooth and the second locking tooth are disengaged to unlock the transmission wheel.

[0011] As a further improvement of the present invention, the locking knob is provided with a receiving groove for receiving the height adjustment knob, and the locking knob and the height adjustment knob are coaxial.

[0012] As a further improvement of the present invention, a first cooperative tooth is provided on the side of the transmission wheel away from the height adjustment knob; the height adjustment rod is provided with a second cooperative tooth matching the first cooperative tooth; when the first cooperative tooth and the second cooperative tooth are meshed, the height adjustment rod rotates driven by the transmission wheel.

[0013] As a further improvement of the present invention, the height adjustment assembly is also provided with a second elastic element cooperating with the height adjustment rod; when the height adjustment knob is pushed against the height adjustment rod, the second elastic element undergoes elastic deformation; when the height adjustment knob is released, the second elastic element is reset.

[0014] As a further improvement of the present invention, the first driving tooth and the first cooperating tooth are located on both sides of the transmission wheel, and the second elastic element is located between the first driving tooth and the transmission wheel.

[0015] As a further improvement of the present invention, the first driving tooth and the first cooperating tooth are located on both sides of the transmission wheel, and the second elastic element is located on a side of the first cooperating tooth away from the first driving tooth.

[0016] As a further improvement of the present invention, the second elastic element is a tension spring, and the tension spring is located between the transmission wheel and the first coordinating tooth.

[0017] As a further improvement of the present invention, the transmission shaft is hollow cylindrical, and its inner wall is provided with an internal height adjustment thread; the height adjustment rod is provided with an external height adjustment thread matching with the internal height adjustment thread, so that the transmission shaft is driven to slide along the transmission rod through the matching of the internal height adjustment thread and the external height adjustment thread.

[0018] As a further improvement of the present invention, the inner wall of the through groove has a guide rail arranged along the axial direction of the transmission rod; the transmission shaft is provided with a guide portion matching with the guide rail to guide the transmission shaft to slide along the guide rail.

[0019] The beneficial effects of the present invention are as follows: the lawn mower of the present invention directly adjusts the height of the cutting blade assembly from the ground through the height adjustment assembly without adjusting the position of the bulky motor, thereby reducing the bearing capacity of the height adjustment assembly and making the height adjustment assembly less susceptible to damage; and such a setting can effectively reduce the overall volume of the lawn mower, thereby reducing the manufacturing, packaging and transportation costs of the lawn mower; in addition, the height adjustment assembly controls the operation of the height adjustment rod by whether the first drive tooth and the second drive tooth are engaged or not, and has a simple structure and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the lawn mower of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the drive assembly and the cutter assembly.

[0022] Figure 3 yes Figure 2 A cross-sectional view of the drive assembly and the cutter assembly after being matched.

[0023] Figure 4 It is a cross-sectional view of the transmission rod.

[0024] Figure 5 It is a three-dimensional structural diagram of the transmission shaft.

[0025] Figure 6 This is a schematic diagram of the height adjustment knob and the locking knob after they are coordinated.

[0026] Figure 7 It is a three-dimensional structural schematic diagram of the height adjustment rod.

[0027] Figure 8 yes Figure 3 A partial enlarged view of . DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] See also Figure 1 as well as Figure 2 As shown, the present invention discloses a lawn mower 100, including a housing 10, a cutter assembly 20, a driving assembly 30 for driving the cutter assembly 20 to work, a height adjustment assembly 40 for adjusting the height of the cutter assembly 20 from the ground, and a walking assembly 50.

[0030] See also Figure 1 As shown, the walking assembly 50 includes a front wheel 51 and a pair of rear wheels 52. The front wheel 51 and the rear wheel 52 are mounted on the housing 10 to facilitate the walking of the lawn mower 100. Preferably, the lawn mower 100 is also provided with a motor for driving the rear wheels 52 to rotate. The cutter assembly 20 includes a cutter disc 21 and a blade 22 pivotally mounted on the periphery of the cutter disc 21. When the cutter assembly 20 is working, the plane where the blade 22 is located is the working plane.

[0031] See also Figure 2 , Figure 3 , Figure 4 as well as Figure 5 As shown, the driving assembly 30 includes a prime mover 31 fixedly mounted on the housing 10 and a transmission mechanism 32 for transmitting the power output by the prime mover 31 to the cutter assembly 20. The prime mover 31 may be a motor, a gasoline engine, etc. The prime mover 31 also includes an output shaft 311 and an output wheel 312 fixedly mounted on the output shaft 311. The output wheel 312 is provided with output gear teeth 3121. The transmission mechanism 32 includes a transmission rod 321 matched with the prime mover 31 and a transmission shaft 322 mounted on the transmission rod 321 and rotatable under the drive of the transmission rod 321. The transmission rod 321 is in a hollow cylindrical shape, and is provided with a through slot 3211 penetrating the transmission rod 321 along the axial direction of the transmission shaft 322. A guide rail 3212 arranged along the axial direction of the transmission rod 321 is provided on the side wall of the through slot 3211. In this embodiment, the number of the guide rails 3212 is four, but in other embodiments, the number of the guide rails 3212 can be set as needed. The end of the transmission rod 321 away from the transmission shaft 322 is also provided with a transmission wheel 3213 that matches the output wheel 312, so that the transmission rod 321 is driven to rotate through the cooperation of the output wheel 312 and the transmission wheel 3213. The transmission wheel 3213 is provided with a transmission gear 3214 that meshes with the output gear teeth 3121. In this embodiment, the output wheel 312 and the transmission wheel 3213 transmit power through the output gear teeth 3121 and the transmission gear teeth 3214, but in other embodiments, the output wheel 312 and the transmission wheel 3213 can also transmit power through a belt. The side of the transmission wheel 3213 away from the transmission shaft 322 is provided with a first locking tooth 3215, and the side facing the transmission shaft 322 is provided with a first cooperative tooth 3216.

[0032] See also Figure 3 as well as Figure 5As shown, the transmission shaft 322 can slide along the transmission rod 321 in the axial direction of the transmission shaft 322, and the cutting knife assembly 20 is fixedly mounted on the end of the transmission shaft 322 away from the transmission rod 321. The transmission shaft 322 is generally in the shape of a hollow cylinder, and an inner height adjustment thread 3221 is provided on its inner wall. A guide portion 3222 matching with the guide rail 3212 is provided on the outer wall of the transmission shaft 322 to guide the transmission shaft 322 to slide along the guide rail 3212. In this embodiment, the guide rail 3212 is a groove, and the guide portion 3222 is a protrusion matching with the groove; however, in other embodiments, the guide rail 3212 may also be a protrusion, and the guide portion 3222 may also be a groove matching with the protrusion.

[0033] In this embodiment, the guide rail 3212 is arranged on the inner wall of the transmission rod 321, and the transmission shaft 322 is at least partially located inside the transmission rod 321. However, it can be understood that in other embodiments, the guide rail 3212 can also be arranged on the outer wall of the transmission rod 321. In this case, the guide portion 3222 is arranged on the inner wall of the transmission shaft 322, and the transmission rod 321 is at least partially located inside the transmission shaft 322.

[0034] See also Figure 2 , Figure 3 as well as Figure 6 , Figure 7As shown, the height adjustment assembly 40 is used to drive the cutter assembly 20 to move in a direction perpendicular to the working plane (i.e., the axial direction of the transmission shaft 322) to adjust the distance of the cutter assembly 20 from the ground. The height adjustment assembly 40 includes a height adjustment rod 41 that drives the transmission shaft 322 to slide along the transmission rod 321, a height adjustment knob 42 that drives the height adjustment rod 41 to rotate, a first elastic element (not shown) matched with the height adjustment knob 42, a second elastic element 43 matched with the height adjustment rod 41, and a locking knob 44 matched with the transmission wheel 3213. One end of the height adjustment rod 41 matches with the transmission shaft 322, and the other end passes through the through slot 3211 and protrudes out of the through slot 3211 to match with the height adjustment knob 42. The end of the height adjustment rod 41 close to the transmission shaft 322 is provided with an outer height adjustment thread 411 matched with the inner height adjustment thread 3221, so that the transmission shaft 322 is driven to move along the upper guide rail 3212 by the cooperation of the inner height adjustment thread 3221 and the outer height adjustment thread 411, thereby adjusting the distance of the cutting knife assembly 20 from the ground. The end of the height adjustment rod 41 away from the outer height adjustment thread 411 is also provided with a first driving tooth 412 and a second coordinated tooth 413, and the first driving tooth 412 and the second coordinated tooth 413 are located on both sides of the transmission wheel 3213. The height adjustment knob 42 is slidably mounted on the housing 10 and can slide along the axial direction of the height adjustment rod 41. The side of the height adjustment knob 42 facing the height adjustment rod 41 is provided with a second driving tooth 421 matched with the first driving tooth 412. One end of the first elastic element is mounted on the housing 10, and the other end is mounted on the height adjustment knob 42, so that the height adjustment knob 42 is reset. The second elastic element 43 is located between the transmission wheel 3213 and the second cooperative tooth 413. The locking knob 44 is provided with a second locking tooth 441 that matches the first locking tooth 3215 to lock the transmission wheel 3213. The locking knob 44 is provided with a receiving groove 442 for receiving the height adjustment knob 42, and the locking knob 44 and the height adjustment knob 42 are coaxial.

[0035] When adjusting the distance of the cutting blade assembly 20 from the ground, that is, the mowing height of the cutting blade assembly 20, first push the height adjustment knob 42 and the locking knob 44 toward the height adjustment rod 41, so that the height adjustment knob 42 slides toward the height adjustment rod 41 and abuts against the height adjustment rod 41, and the locking knob 44 abuts against the transmission wheel 3213. At this time, the height adjustment knob 42 and the locking knob 44 are in the first state, the first elastic element and the second elastic element 43 are elastically deformed, the first driving tooth 412 and the second driving tooth 421 are meshed, the first locking tooth 3215 and the second locking tooth 441 are meshed to lock the transmission wheel 3213, and the first cooperative tooth 3216 and the second cooperative tooth 413 are disengaged. Since the locking knob 44 cannot rotate, when the first locking tooth 3215 and the second locking tooth 441 are engaged, the transmission wheel 3213 cannot rotate; and since the first cooperative tooth 3216 and the second cooperative tooth 413 are disengaged, the height adjustment rod 41 can rotate under the drive of the height adjustment knob 42, thereby driving the transmission shaft 322 to slide along the transmission rod 321 through the cooperation of the inner height adjustment thread 3221 and the outer height adjustment thread 411, thereby achieving the adjustment of the height of the cutting knife assembly 20 from the ground. When the height adjustment knob 42 and the locking knob 44 are released, the height adjustment knob 42 and the locking knob 44 are reset under the action of the first elastic element. At this time, the height adjustment knob 42 and the locking knob 44 are in the second state, the first driving tooth 412 and the second driving tooth 421 are disengaged, the first locking tooth 3215 and the second locking tooth 441 are disengaged to unlock the transmission wheel 3213, and the second elastic element 43 is reset, so that the first cooperative tooth 3216 and the second cooperative tooth 413 are engaged. Since the first cooperative tooth 3216 and the second cooperative tooth 413 are engaged, the height adjustment rod 41 can rotate under the drive of the transmission wheel 3213.

[0036] In this embodiment, the second elastic element 43 is disposed between the first driving tooth 412 and the transmission wheel 3213. However, in other embodiments, the second elastic element 43 may also be disposed between the transmission wheel 3213 and the first cooperative tooth 3216, in which case the second elastic element 43 is a tension spring. Of course, it is understood that in other embodiments, the second elastic element 43 may also be disposed on the side of the first cooperative tooth 3216 away from the first driving tooth 412, in which case one end of the second elastic element 43 is mounted on the driving rod 41, and the other end is mounted on the transmission rod 321.

[0037] In other embodiments, the outer wall of the transmission shaft 322 may also be provided with an external height adjustment thread (not shown), and in this case, the height adjustment assembly 40 includes an adjustment sleeve (not shown). The adjustment sleeve is fixedly mounted on one end of the transmission rod 321 close to the transmission shaft 322, and its inner wall is provided with an internal height adjustment thread that matches the external height adjustment thread of the transmission shaft 322, so that the transmission shaft 322 is driven to move along the guide rail 3212 through the cooperation of the external height adjustment thread and the internal height adjustment thread, thereby adjusting the distance of the cutter assembly 20 from the ground.

[0038] It is understandable that, in other embodiments, the transmission mechanism 32 may further include a bearing (not shown) fixedly mounted on the transmission shaft 322 and a bearing seat (not shown) mounted on the housing 10 and matched with the bearing. The housing 10 is provided with a travel groove (not shown) matched with the bearing seat. The height adjustment assembly 40 drives the bearing seat to move along the travel groove, thereby driving the transmission shaft 322 to move along the guide rail 3212, thereby adjusting the distance of the cutting knife assembly 20 from the ground.

[0039] Of course, it is understood that in other embodiments, the transmission mechanism 32 may also be a turbine (not shown) matched with the prime mover 31 and a worm (not shown) matched with the turbine, and the end of the worm away from the turbine is equipped with the cutter assembly 20. In this embodiment, the worm is driven to rotate by the turbine, thereby driving the cutter assembly 20 to work. When adjusting the distance of the cutter assembly 20 from the ground, the worm is driven to move in a direction perpendicular to the working plane by the height adjustment assembly 40.

[0040] Compared with the prior art, the lawn mower 100 of the present invention directly adjusts the height of the cutter assembly 20 from the ground through the height adjustment assembly 40 without adjusting the position of the bulky motor, thereby reducing the bearing capacity of the height adjustment assembly 40 and making the height adjustment assembly 40 less susceptible to damage; and such a setting can effectively reduce the overall volume of the lawn mower, thereby reducing the manufacturing, packaging and transportation costs of the lawn mower.

[0041] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A lawn mower, characterized in that: include: case; A cutting knife assembly, wherein the cutting knife assembly can move in a direction perpendicular to the working plane; A drive assembly, the drive assembly includes a prime mover fixedly mounted on the housing and a transmission mechanism for transmitting power output by the prime mover to the cutter assembly; the transmission mechanism includes a transmission rod matched with the prime mover and a transmission shaft slidably mounted on the transmission rod and rotatable under the drive of the transmission rod, the transmission rod is provided with a transmission wheel, and a first locking tooth is provided on a side of the transmission wheel facing the height adjustment knob; the cutter assembly is mounted on an end of the transmission shaft away from the transmission rod; as well as A height adjustment component, the height adjustment component includes a height adjustment rod driving the transmission shaft to slide along the transmission rod and a height adjustment knob matched with the height adjustment rod; the height adjustment rod is provided with a first driving tooth, and the height adjustment knob is provided with a second driving tooth matched with the first driving tooth; the height adjustment component also includes a locking knob matched with the transmission wheel, and the locking knob is provided with a second locking tooth matched with the first locking tooth; When the height adjustment knob and the locking knob are in a first state, the first locking tooth and the second locking tooth are meshed to lock the transmission wheel; the first driving tooth and the second driving tooth are meshed, and the height adjustment knob drives the height adjustment rod to work; When the height adjustment knob and the locking knob are in the second state, the first driving tooth and the second driving tooth are disengaged, and the first locking tooth and the second locking tooth are disengaged to unlock the transmission wheel, and the height adjustment rod rotates under the drive of the transmission wheel.

2. The lawn mower according to claim 1, characterized in that: The height adjustment knob is slidably mounted on the shell and can slide along the axial direction of the height adjustment rod; when the height adjustment knob is pushed toward the height adjustment rod, the height adjustment knob slides toward the height adjustment rod and resists the height adjustment rod, so that the first drive tooth and the second drive tooth are engaged; when the height adjustment knob is pushed in a direction away from the height adjustment rod, the first drive tooth and the second drive tooth are disengaged.

3. The lawn mower according to claim 2, characterized in that: The height adjustment component also includes a first elastic element that cooperates with the height adjustment knob; when the height adjustment knob is pushed toward the height adjustment rod, the first elastic element undergoes elastic deformation; when the height adjustment knob is released, the first elastic element pushes the height adjustment knob to return to its original position.

4. The lawn mower according to claim 2, characterized in that: The transmission rod is provided with a through slot which penetrates the transmission rod along the axial direction of the transmission shaft; one end of the height adjustment rod cooperates with the transmission shaft, and the other end passes through the through slot and protrudes out of the through slot to cooperate with the height adjustment knob.

5. The lawn mower according to claim 4, characterized in that: The prime mover has an output shaft and an output wheel mounted on the output shaft; the transmission wheel matches the output wheel.

6. The lawn mower according to claim 1, characterized in that: The locking knob is provided with a receiving groove for receiving the height adjustment knob, and the locking knob and the height adjustment knob are coaxial.

7. The lawn mower according to claim 1, characterized in that: A first cooperating tooth is arranged on the side of the transmission wheel away from the height adjustment knob; the height adjustment rod is provided with a second cooperating tooth matching with the first cooperating tooth; when the first cooperating tooth and the second cooperating tooth are meshed, the height adjustment rod rotates driven by the transmission wheel.

8. The lawn mower according to claim 7, characterized in that: The height adjustment component is also provided with a second elastic element matched with the height adjustment rod; when the height adjustment knob is pushed to abut against the height adjustment rod, the second elastic element undergoes elastic deformation; when the height adjustment knob is released, the second elastic element is reset.

9. The lawn mower according to claim 8, characterized in that: The first driving tooth and the first cooperating tooth are located on both sides of the transmission wheel, and the second elastic element is located between the first driving tooth and the transmission wheel.

10. The lawn mower according to claim 8, characterized in that: The first driving tooth and the first cooperating tooth are located on both sides of the transmission wheel, and the second elastic element is located on a side of the first cooperating tooth away from the first driving tooth.

11. The lawn mower according to claim 8, characterized in that: The second elastic element is a tension spring, and the tension spring is located between the transmission wheel and the first cooperative tooth.

12. The lawn mower according to claim 4, characterized in that: The transmission shaft is in the shape of a hollow cylinder, and its inner wall is provided with an internal height adjustment thread; the height adjustment rod is provided with an external height adjustment thread matching the internal height adjustment thread, so that the transmission shaft is driven to slide along the transmission rod through the matching of the internal height adjustment thread and the external height adjustment thread.

13. The lawn mower according to claim 12, characterized in that: The inner wall of the through groove is provided with a guide rail arranged along the axial direction of the transmission rod; the transmission shaft is provided with a guide portion matched with the guide rail to guide the transmission shaft to slide along the guide rail.

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