CN112119746A

CN112119746A - Grass cutter

Info

Publication number: CN112119746A
Application number: CN202011107427.3A
Authority: CN
Inventors: 李汪浩; 高杰; 曹金; 蒲志高
Original assignee: Globe Jiangsu Co Ltd
Current assignee: Globe Jiangsu Co Ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2020-12-25

Abstract

The present invention provides a lawn mower comprising: a housing; a cutter assembly; a drive assembly including a prime mover and a transmission; the transmission mechanism comprises a transmission rod matched with the prime motor and a transmission shaft which is arranged on the transmission rod in a sliding way and can rotate under the driving of the transmission rod, and the cutting knife assembly is arranged at one end of the transmission shaft, which is far away from the transmission rod; the height adjusting assembly comprises a height adjusting rod for driving the transmission shaft to slide along the transmission rod and a height adjusting knob matched with the height adjusting rod; the height adjusting rod is provided with a first driving tooth, and the height adjusting knob is provided with a second driving tooth; when the height adjusting knob is in a first state, the first driving tooth and the second driving tooth are meshed; when the heightening knob is in a second state, the first driving tooth and the second driving tooth are separated from contact. Compared with the prior art, the mower controls the work of the height-adjusting rod through the meshing of the first driving tooth and the second driving tooth, and is simple in structure and high in reliability.

Description

Grass cutter

Technical Field

The invention relates to a mower, in particular to a mower with adjustable mowing height.

Background

The mower is a mechanical tool for trimming lawns, vegetations and the like, can effectively improve the weeding efficiency of operation workers and reduce the labor intensity of the operation workers. However, the lawn height requirements of different users are different. For this reason, researchers have designed lawn mowers that can always adjust the mowing height so that users can freely select the mowing height.

At present, a mower with a height-adjusting system generally comprises a motor, a cutter head fixedly arranged on an output shaft of the motor and a height-adjusting mechanism for driving the motor to move up and down. When the mowing height is adjusted, the height adjusting mechanism drives the motor to move up and down, so that the cutter disc arranged on the output shaft is driven to move to adjust the ground clearance of the cutter disc, and the aim of adjusting the mowing height is achieved. Because the height adjusting mechanism drives the motor to move up and down, and the motor is heavy, the user is more laboursome when adjusting the mowing height. Moreover, the motor is heavy, so that the height adjusting mechanism is easy to damage. In addition, the height adjusting mechanism drives the motor and the cutter head to move together, so that a large space is reserved for the mower and the cutter head to move. Therefore, the overall size of the mower is large, and the manufacturing, packaging and transportation costs of the mower are increased.

In view of the above problems, there is a need to provide a new lawn mower to solve the above problems.

Disclosure of Invention

The invention aims to provide a mower, which directly adjusts the ground clearance of a cutting knife assembly through a height-adjusting assembly without adjusting the position of a heavy motor, thereby reducing the bearing capacity of the height-adjusting assembly and ensuring that the height-adjusting assembly is not easy to damage; moreover, the overall size of the mower can be effectively reduced, so that the manufacturing, packaging and transportation costs of the mower are reduced; in addition, the heightening component controls the work of the heightening rod through the meshing of the first driving tooth and the second driving tooth, and the heightening rod is simple in structure and high in reliability.

To achieve the above object, the present invention provides a lawnmower comprising: a housing; a cutter assembly movable in a direction perpendicular to the work plane; the driving assembly comprises a prime mover fixedly arranged on the shell and a transmission mechanism for transmitting the power output by the prime mover to the cutting knife assembly; the transmission mechanism comprises a transmission rod matched with the prime motor and a transmission shaft which is arranged on the transmission rod in a sliding mode and can rotate under the driving of the transmission rod, and the cutting knife assembly is arranged at one end, away from the transmission rod, of the transmission shaft; the height adjusting assembly comprises a height adjusting rod and a height adjusting knob, the height adjusting rod drives the transmission shaft to slide along the transmission rod, and the height adjusting knob is matched with the height adjusting rod; the height adjusting rod is provided with a first driving tooth, and the height adjusting knob is provided with a second driving tooth matched with the first driving tooth; when the height adjusting knob is in a first state, the first driving tooth and the second driving tooth are meshed, so that the height adjusting knob drives the height adjusting rod to work; when the heightening knob is in a second state, the first driving tooth and the second driving tooth are separated from contact.

As a further improvement of the invention, the height-adjusting knob is slidably mounted on the housing and can slide along the axial direction of the height-adjusting rod; when the height adjusting knob is pushed to the height adjusting rod, the height adjusting knob slides to the height adjusting rod and abuts against the height adjusting rod, so that the first driving tooth and the second driving tooth are meshed; when the heightening knob is pushed in a direction departing from the heightening rod, the first driving tooth and the second driving tooth are disengaged.

As a further improvement of the present invention, the height-adjusting assembly further comprises a first elastic element matched with the height-adjusting knob; when the height adjusting knob is pushed to the height adjusting rod, the first elastic element is elastically deformed; when the heightening knob is loosened, the first elastic element pushes the heightening knob to reset.

As a further improvement of the invention, the transmission rod is provided with a through groove which penetrates through the transmission rod along the axial direction of the transmission shaft; one end of the height-adjusting rod is matched with the transmission shaft, and the other end of the height-adjusting rod penetrates through the through groove and protrudes out of the through groove to be matched with the height-adjusting knob.

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 matched with the output wheel; one side of the driving wheel facing the height-adjusting knob is provided with a first locking tooth; the height adjusting assembly further comprises 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 locking knob is in a first state, the first locking tooth and the second locking tooth are meshed 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.

As a further improvement of the invention, the locking knob is provided with a containing groove for containing the heightening knob, and the locking knob and the heightening knob are coaxial.

As a further improvement of the invention, one side of the transmission wheel, which is far away from the height-adjusting knob, is provided with a first cooperative tooth; the height adjusting rod is provided with a second cooperative tooth matched with the first cooperative tooth; when the first cooperative tooth and the second cooperative tooth are meshed, the height adjusting rod is driven by the driving wheel to rotate.

As a further improvement of the invention, the height-adjusting assembly is further provided with a second elastic element matched with the height-adjusting rod; when the height-adjusting knob is pushed to abut against the height-adjusting rod, the second elastic element is elastically deformed; when the height-adjusting knob is loosened, the second elastic element is reset.

As a further development of the invention, the first drive tooth, the first cooperating tooth are located on both sides of the drive wheel, and the second resilient element is located between the first drive tooth and the drive wheel.

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

As a further development of the invention, the second elastic element is a tension spring, which is located between the drive wheel and the first cooperating tooth.

As a further improvement of the invention, the transmission shaft is in a hollow cylinder shape, and the inner wall of the transmission shaft is provided with an inner height-adjusting thread; the height-adjusting rod is provided with an outer height-adjusting thread matched with the inner height-adjusting thread, so that the transmission shaft is driven to slide along the transmission rod through the matching of the inner height-adjusting thread and the outer height-adjusting thread.

As a further improvement of the invention, 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 part matched with the guide rail so as to guide the transmission shaft to slide along the guide rail.

The invention has the beneficial effects that: according to the mower, the height of the cutting knife assembly above the ground is directly adjusted through the height-adjusting assembly without adjusting the position of a heavy motor, so that the bearing capacity of the height-adjusting assembly is reduced, and the height-adjusting assembly is not easy to damage; moreover, the overall size of the mower can be effectively reduced, so that the manufacturing, packaging and transportation costs of the mower are reduced; in addition, the heightening component controls the work of the heightening rod through the meshing of the first driving tooth and the second driving tooth, and the heightening rod is simple in structure and high in reliability.

Drawings

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

Fig. 2 is a schematic structural diagram of the driving assembly and the cutting knife assembly.

Fig. 3 is a cross-sectional view of the drive assembly and cutting blade assembly of fig. 2 engaged.

Fig. 4 is a cross-sectional view of the drive link.

Fig. 5 is a perspective view of the drive shaft.

Fig. 6 is a schematic view of the adjustment knob and the locking knob after being engaged.

Fig. 7 is a perspective view of the height adjusting rod.

Fig. 8 is a partially enlarged view of fig. 3.

Detailed Description

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

Referring to fig. 1 and 2, the present invention discloses a lawn mower 100, which comprises a housing 10, a cutter assembly 20, a driving assembly 30 for driving the cutter assembly 20 to work, an elevation assembly 40 for adjusting the height of the cutter assembly 20 above the ground, and a walking assembly 50.

Referring to fig. 1, the walking assembly 50 includes a front wheel 51 and a pair of rear wheels 52. The front wheels 51 and the rear wheels 52 are mounted on the housing 10 to facilitate the walking of the mower 100. Preferably, the mower 100 is further provided with a motor for driving the rear wheel 52 to rotate. The cutter assembly 20 comprises a cutter disc 21 and blades 22 pivotally mounted on the periphery of the cutter disc 21. When the cutter assembly 20 is in operation, the plane in which the blades 22 lie is the work plane.

Referring to fig. 2, 3, 4 and 5, the driving assembly 30 includes a prime mover 31 fixedly mounted on the housing 10 and a transmission mechanism 32 for transmitting power output from the prime mover 31 to the cutting blade assembly 20. The prime mover 31 may be an electric motor, a gasoline engine, or the like. The prime mover 31 further 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 engaged with the prime mover 31, and a transmission shaft 322 installed on the transmission rod 321 and rotatable by the transmission rod 321. The transmission rod 321 is hollow and cylindrical, and a through groove 3211 is formed in the transmission rod 321 and penetrates through the transmission rod 322 in the axial direction. The side wall of the through groove 3211 is provided with a guide rail 3212 arranged along the axial direction of the transmission rod 321. In the present embodiment, the number of the guide rails 3212 is four, but in other embodiments, the number of the guide rails 3212 may be set as required. A driving wheel 3213 matched with the output wheel 312 is further disposed at an end of the transmission rod 321 away from the transmission shaft 322, so that the transmission rod 321 is driven to rotate through matching of the output wheel 312 and the driving wheel 3213. The transmission wheel 3213 is provided with transmission wheel teeth 3214 engaged with the output wheel teeth 3121. In this embodiment, the output wheel 312 and the transmission wheel 3213 transmit power through the output gear 3121 and the transmission gear 3214, but in other embodiments, the output wheel 312 and the transmission wheel 3213 may also transmit power through a belt. A first locking tooth 3215 is disposed on a side of the transmission wheel 3213 facing away from the transmission shaft 322, and a first cooperating tooth 3216 is disposed on a side of the transmission wheel 3213 facing toward the transmission shaft 322.

Referring to fig. 3 and 5, 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 installed at an end of the transmission shaft 322 that faces away from the transmission rod 321. The transmission shaft 322 is substantially hollow and cylindrical, and an inner height-adjusting thread 3221 is disposed on an inner wall thereof. The outer wall of the transmission shaft 322 is provided with a guide portion 3222 which is matched with the guide rail 3212 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 guiding portion 3222 is a protrusion matching with the groove; however, in other embodiments, the guiding rail 3212 may be a protrusion, and the guiding portion 3222 may be a groove matching with the protrusion.

In the embodiment, the guiding track 3212 is disposed on an inner wall of the transmission rod 321, and the transmission rod 322 is at least partially disposed inside the transmission rod 321, but it is understood that in other embodiments, the guiding track 3212 may also be disposed on an outer wall of the transmission rod 321, and the guiding portion 3222 is disposed on an inner wall of the transmission rod 322, and the transmission rod 321 is at least partially disposed inside the transmission rod 322.

Referring to fig. 2 and 3, and fig. 6 and 7, the height-adjusting 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) so as to adjust the ground clearance of the cutter assembly 20. The height-adjusting assembly 40 comprises a height-adjusting rod 41 for driving the transmission shaft 322 to slide along the transmission rod 321, a height-adjusting knob 42 for driving the height-adjusting rod 41 to rotate, a first elastic element (not shown) matched with the height-adjusting knob 42, a second elastic element 43 matched with the height-adjusting rod 41, and a locking knob 44 matched with the transmission wheel 3213. One end of the height-adjusting rod 41 is engaged with the transmission shaft 322, and the other end thereof passes through the through groove 3211 and protrudes out of the through groove 3211 to engage with the height-adjusting knob 42. One end of the height-adjusting rod 41 close to the transmission shaft 322 is provided with an outer height-adjusting thread 411 matched with the inner height-adjusting thread 3221, so that the transmission shaft 322 is driven to move along the upper guide rail 3212 through the matching of the inner height-adjusting thread 3221 and the outer height-adjusting thread 411, and the ground clearance of the cutting knife assembly 20 is further adjusted. One end of the height-adjusting rod 41, which faces away from the external height-adjusting thread 411, is further provided with a first driving tooth 412 and a second cooperating tooth 413, and the first driving tooth 412 and the second cooperating tooth 413 are located on two sides of the transmission wheel 3213. The height-adjusting knob 42 is slidably mounted on the housing 10 and is slidable along the axial direction of the height-adjusting rod 41. The side of the height-adjusting knob 42 facing the height-adjusting 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-adjusting knob 42, so that the height-adjusting knob 42 is reset. The second elastic element 43 is located between the transmission wheel 3213 and the second cooperating tooth 413. The locking knob 44 is provided with a second locking tooth 441 engaged with 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-adjusting knob 42, and the locking knob 44 and the height-adjusting knob 42 are coaxial.

When the ground clearance of the cutter assembly 20 is adjusted, namely: when the mowing height of the cutting knife assembly 20 is increased, the height-adjusting knob 42 and the locking knob 44 are firstly pushed towards the height-adjusting rod 41, so that the height-adjusting knob 42 slides towards the height-adjusting rod 41 and abuts against the height-adjusting rod 41, the locking knob 44 abuts against the transmission wheel 3213, at this time, the height-adjusting knob 42 and the locking knob 44 are in a 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 engaged, the first locking tooth 3215 and the second locking tooth 441 are engaged to lock the transmission wheel 3213, and the first cooperating tooth 3216 and the second cooperating 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; since the first and second cooperating

teeth

3216 and 413 are disengaged, the height-adjusting lever 41 can be rotated by the height-adjusting knob 42, so that the transmission shaft 322 is driven to slide along the transmission rod 321 by the engagement of the inner height-adjusting thread 3221 and the outer height-adjusting thread 411, thereby adjusting the height of the cutting knife assembly 20 from the ground. When the height-adjusting knob 42 and the locking knob 44 are loosened, the height-adjusting knob 42 and the locking knob 44 are reset under the action of the first elastic element, at this time, the height-adjusting knob 42 and the locking knob 44 are in a 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 cooperating tooth 3216 and the second cooperating tooth 413 are engaged. The first cooperating tooth 3216 and the second cooperating tooth 413 are engaged with each other, so that the height-adjusting lever 41 can rotate under the driving of the transmission wheel 3213.

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 cooperating 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 can be disposed on a side of the first cooperating tooth 3216 facing away from the first driving tooth 412, and one end of the second elastic element 43 is mounted on the driving rod 41 and the other end is mounted on the driving rod 321.

In other embodiments, the outer wall of the transmission shaft 322 may also be provided with an external height-adjusting thread (not shown), in which case the height-adjusting assembly 40 includes an adjusting sleeve (not shown). The adjusting sleeve is fixedly installed at one end of the transmission rod 321 close to the transmission shaft 322, and an inner height-adjusting thread matched with the outer height-adjusting thread of the transmission shaft 322 is arranged on the inner wall of the adjusting sleeve, so that the transmission shaft 322 is driven to move along the guide rail 3212 through the matching of the outer height-adjusting thread and the inner height-adjusting thread, and the ground clearance of the cutting knife assembly 20 is adjusted.

It will be appreciated 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 cooperating with the bearing. The housing 10 is provided with a stroke groove (not shown) which is fitted with the bearing housing. The height-adjusting assembly 40 drives the bearing seat to move along the travel groove, so as to drive the transmission shaft 322 to move along the guide rail 3212, thereby adjusting the ground clearance of the cutting knife assembly 20.

Of course, it will be appreciated that in other embodiments, the transmission 32 may also be a worm gear (not shown) coupled to the prime mover 31 and a worm gear (not shown) coupled to the worm gear, the end of the worm gear facing away from the worm gear mounting the knife assembly 20. In the embodiment, the worm is driven to rotate by the worm wheel, so as to drive the cutter assembly 20 to work. When the ground clearance of the cutter assembly 20 is adjusted, the worm is driven to move along the direction vertical to the working plane through the height adjusting assembly 40.

Compared with the prior art, the mower 100 directly adjusts the ground clearance of the cutting knife assembly 20 through the height-adjusting assembly 40 without adjusting the position of a heavy motor, so that the bearing capacity of the height-adjusting assembly 40 is reduced, and the height-adjusting assembly 40 is not easy to damage; moreover, the overall size of the mower can be effectively reduced, so that the manufacturing, packaging and transporting costs of the mower are reduced.

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

Claims

1. A lawn mower, comprising:

a housing;

a cutter assembly movable in a direction perpendicular to the work plane;

the driving assembly comprises a prime mover fixedly arranged on the shell and a transmission mechanism for transmitting the power output by the prime mover to the cutting knife assembly; the transmission mechanism comprises a transmission rod matched with the prime motor and a transmission shaft which is arranged on the transmission rod in a sliding mode and can rotate under the driving of the transmission rod, and the cutting knife assembly is arranged at one end, away from the transmission rod, of the transmission shaft; and

the height adjusting assembly comprises a height adjusting rod and a height adjusting knob, the height adjusting rod drives the transmission shaft to slide along the transmission rod, and the height adjusting knob is matched with the height adjusting rod; the height adjusting rod is provided with a first driving tooth, and the height adjusting knob is provided with a second driving tooth matched with the first driving tooth;

when the height adjusting knob is in a first state, the first driving tooth and the second driving tooth are meshed, so that the height adjusting knob drives the height adjusting rod to work;

when the heightening knob is in a second state, the first driving tooth and the second driving tooth are separated from contact.

2. The mower of claim 1, wherein: the height adjusting knob is slidably mounted on the shell and can slide along the axial direction of the height adjusting rod; when the height adjusting knob is pushed to the height adjusting rod, the height adjusting knob slides to the height adjusting rod and abuts against the height adjusting rod, so that the first driving tooth and the second driving tooth are meshed; when the heightening knob is pushed in a direction departing from the heightening rod, the first driving tooth and the second driving tooth are disengaged.

3. The mower of claim 2, wherein: the height-adjusting assembly further comprises a first elastic element matched with the height-adjusting knob; when the height adjusting knob is pushed to the height adjusting rod, the first elastic element is elastically deformed; when the heightening knob is loosened, the first elastic element pushes the heightening knob to reset.

4. The mower of claim 2, wherein: the transmission rod is provided with a through groove which penetrates through the transmission rod along the axial direction of the transmission shaft; one end of the height-adjusting rod is matched with the transmission shaft, and the other end of the height-adjusting rod penetrates through the through groove and protrudes out of the through groove to be matched with the height-adjusting knob.

5. The mower of claim 4, wherein: 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 matched with the output wheel; one side of the driving wheel facing the height-adjusting knob is provided with a first locking tooth; the height adjusting assembly further comprises 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 locking knob is in a first state, the first locking tooth and the second locking tooth are meshed 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.

6. The mower of claim 5, wherein: the locking knob is provided with an accommodating groove for accommodating the heightening knob, and the locking knob and the heightening knob are coaxial.

7. The mower of claim 5, wherein: one side of the driving wheel, which is far away from the height-adjusting knob, is provided with a first cooperative tooth; the height adjusting rod is provided with a second cooperative tooth matched with the first cooperative tooth; when the first cooperative tooth and the second cooperative tooth are meshed, the height adjusting rod is driven by the driving wheel to rotate.

8. The mower of claim 7, wherein: the height-adjusting component is also provided with a second elastic element matched with the height-adjusting rod; when the height-adjusting knob is pushed to abut against the height-adjusting rod, the second elastic element is elastically deformed; when the height-adjusting knob is loosened, the second elastic element is reset.

9. The mower of claim 8, wherein: the first driving tooth and the first cooperating tooth are located on two sides of the driving wheel, and the second elastic element is located between the first driving tooth and the driving wheel.

10. The mower of claim 8, wherein: the first driving tooth and the first cooperating tooth are located on two sides of the driving wheel, and the second elastic element is located on one side, away from the first driving tooth, of the first cooperating tooth.

11. The mower of claim 8, wherein: the second elastic element is a tension spring which is positioned between the driving wheel and the first cooperating teeth.

12. The mower of claim 4, wherein: the transmission shaft is in a hollow cylinder shape, and the inner wall of the transmission shaft is provided with an inner height-adjusting thread; the height-adjusting rod is provided with an outer height-adjusting thread matched with the inner height-adjusting thread, so that the transmission shaft is driven to slide along the transmission rod through the matching of the inner height-adjusting thread and the outer height-adjusting thread.

13. The mower of claim 12, wherein: the inner wall of the through groove is provided with a guide rail axially arranged along the transmission rod; the transmission shaft is provided with a guide part matched with the guide rail so as to guide the transmission shaft to slide along the guide rail.