Push mower

Abstract

The present invention provides a push mower, comprising a driving component, an impact protection component, a transmission component and a cutting component, wherein the impact protection component comprises a first bearing seat and a second bearing seat with transition fit, and an elastic member and a ball located between the first bearing seat and the second bearing seat, wherein the first bearing seat is provided with a protrusion, and when the driving component is driven normally, the ball is pushed by the elastic member to contact with the protrusion of the first bearing seat, so as to drive the transmission component and the cutting component to rotate synchronously, and when the resistance to the cutting component is greater than a certain value, the elastic member is further compressed, the ball passes over the protrusion, and relative rotation occurs between the transmission component and the driving component. Compared with the prior art, the push mower of the present invention has an impact protection function and can better protect the transmission component.

Description

Technical Field

[0001] The invention relates to a lawn mower and belongs to the technical field of garden tools. Background Art

[0002] The mower blades on the market are basically single blade. With the development of the market, in order to meet the consumer's requirements for cutting width, the mower blades have changed from single blade to double blade, which greatly increases the cutting width of the mower and meets the higher requirements of consumers.

[0003] For double-blade push mowers, plastic gears are generally used to replace commonly used metal gears in order to avoid excessive noise during gear transmission. However, during the mowing process, obstacles such as stones often appear on the lawn. When the blade rotates at high speed and hits the obstacle, the reverse force of the obstacle will cause the blade to stop. The reverse force is transmitted to the plastic gear through the blade connecting shaft. At this time, the motor is still running, and the instantaneous torque is very large, which will cause the gears to collide with each other, causing gear tooth collapse and the whole machine to not work properly.

[0004] In view of this, it is necessary to improve the existing lawn mower to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a push mower having a collision protection function.

[0006] To achieve the above-mentioned purpose, the present invention provides a lawn mower, including a driving component, an impact protection component, a transmission component and a cutting component. The impact protection component includes a first bearing seat and a second bearing seat with a transition fit, and an elastic member and a ball located between the first bearing seat and the second bearing seat. A protrusion is provided on the first bearing seat. When the driving component is driven normally, the ball is pushed by the elastic member to contact the protrusion of the first bearing seat to drive the transmission component and the cutting component to rotate synchronously. When the resistance encountered by the cutting component is greater than a certain value, the elastic member is continuously compressed and the ball passes over the protrusion, so that relative rotation occurs between the transmission component and the driving component.

[0007] As a further improvement of the present invention, the first bearing seat is further provided with a sliding groove for the ball to slide, and the sliding groove is arranged in an annular shape and passes over the protrusion.

[0008] As a further improvement of the present invention, the driving assembly includes a motor and a motor shaft, one end of the motor shaft is inserted into the first bearing seat, and a flat key is accommodated in the first bearing seat so that the motor shaft and the first bearing seat can transmit torque through the flat key.

[0009] As a further improvement of the present invention, a boss is provided on the second bearing seat, and the elastic member and the ball are both accommodated in the boss. When the second bearing seat is sleeved on the first bearing seat, the ball contacts the first bearing seat, and the elastic member is limitedly accommodated between the boss and the ball.

[0010] As a further improvement of the present invention, the impact protection component also includes a driving shaft connecting the transmission component and the cutting component and a one-way bearing sleeved on the driving shaft. When the driving component is driven normally, the transmission component drives the driving shaft, the one-way bearing and the cutting component to rotate synchronously. When the resistance encountered by the cutting component is greater than a certain value, the one-way bearing locks the driving shaft.

[0011] As a further improvement of the present invention, the transmission assembly includes a first gear connected to the second bearing seat and a second gear meshing with the first gear, the cutting assembly includes a first blade connected to the second gear, and the drive shaft and the one-way bearing are connected between the second gear and the first blade.

[0012] As a further improvement of the present invention, the transmission assembly also includes a third gear and a fourth gear, the third gear is respectively meshed with the first gear and the fourth gear, the cutting assembly also includes a second blade connected to the fourth gear, and the drive shaft and the one-way bearing are also connected between the fourth gear and the second blade.

[0013] As a further improvement of the present invention, the centers of the first gear, the second gear, the third gear and the fourth gear are located on the same straight line, and the first blade and the second blade are perpendicular to each other and rotate in opposite directions in the same plane.

[0014] As a further improvement of the present invention, the transmission assembly also includes a gear box with an accommodating space and a cover plate for covering the top of the accommodating space, the gear box includes a bottom wall, an annular side wall protruding upward from the periphery of the bottom wall, and two protrusions protruding downward from two opposite ends of the bottom wall, the accommodating space is formed between the bottom wall and the annular side wall, the drive assembly is fixed on the cover plate, and the two drive shafts respectively protrude downward beyond the corresponding protrusions.

[0015] As a further improvement of the present invention, the first gear, the second gear, the third gear and the fourth gear are accommodated in the accommodating space, and the second gear and the third gear are arranged on opposite sides of the first gear, and the fourth gear is arranged away from the first gear.

[0016] The beneficial effect of the present invention is that the lawn mower of the present invention arranges an elastic member and a ball between the first bearing seat and the second bearing seat, and arranges a protrusion on the first bearing seat, so that when the driving component is driven normally, the ball is pushed by the elastic member to contact the protrusion of the first bearing seat, which can drive the transmission component and the cutting component to rotate synchronously. When the reaction force of the cutting component caused by external obstacles is greater than a certain value, the elastic member is continuously compressed and the ball passes over the protrusion, so that relative rotation occurs between the transmission component and the driving component, thereby achieving the purpose of protecting the transmission component. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a partial stereoscopic view of a lawn mower of the present invention.

[0018] Figure 2 yes Figure 1 Partial exploded view of the .

[0019] Figure 3 yes Figure 2 Exploded view of the center impact protection assembly.

[0020] Figure 4 yes Figure 2 Exploded view of the transmission assembly.

[0021] Figure 5 yes Figure 4 Schematic diagram from another angle.

[0022] Figure 6 yes Figure 2 Exploded view of the first blade.

[0023] Figure 7 yes Figure 2 Exploded view of the second blade. DETAILED DESCRIPTION

[0024] 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.

[0025] The present invention discloses a push lawn mower (not shown), comprising a main body, a push rod extending upward and backward from the rear of the main body, and running wheels arranged at the bottom of the main body, wherein the running wheels include two front running wheels arranged at both sides of the front end of the main body and two rear running wheels arranged at both sides of the rear end of the main body, so as to jointly support the main body and drive the push lawn mower to move. Since the push rod and the running wheels can be designed according to the existing scheme, the structures of the push rod and the running wheels are not described.

[0026] like Figure 1 and Figure 2As shown, a driving component 10, an impact protection component 20, a transmission component 30 and a cutting component 40 are installed on the main body. The driving component 10 is used to drive the transmission component 30 to rotate. The transmission component 30 is connected to the cutting component 40, so that when the transmission component 30 rotates, the cutting component 40 can be driven to rotate to realize the cutting function.

[0027] The driving assembly 10 includes a motor 11 and a motor shaft 12. The motor shaft 12 protrudes beyond the bottom of the motor 11, and one end of the motor shaft 12 extends into the transmission assembly 30, so that when the motor 11 is started, the motor shaft 12 rotates and drives the transmission assembly 30 to rotate.

[0028] like Figure 4 and Figure 5 As shown, the transmission assembly 30 includes a first gear 31, a second gear 32, a third gear 33 and a fourth gear 34 which are placed horizontally. The centers of the first gear 31, the second gear 32, the third gear 33 and the fourth gear 34 are located in the same straight line. The first gear 31 is connected to the motor shaft 12 so that it can rotate synchronously with the motor shaft 12 when driven by the motor shaft 12.

[0029] The second gear 32 is meshed with the first gear 31, and the third gear 33 is meshed with the first gear 31 and the fourth gear 34 respectively. In other words, the second gear 32 and the third gear 33 are arranged on opposite sides of the first gear 31, and the fourth gear 34 is arranged away from the first gear 31. When the first gear 31 is driven by the motor shaft 12 to rotate, the second gear 32 and the third gear 33 can be driven to rotate synchronously, and the fourth gear 34 is also driven by the third gear 33 to rotate synchronously, but the second gear 32 and the fourth gear 34 rotate in opposite directions, that is, when the first gear 31 rotates clockwise, the second gear 32 rotates counterclockwise and the fourth gear 34 rotates clockwise.

[0030] The transmission assembly 30 further includes a gear box 35 formed with an accommodating space 301 and a cover plate 36 for covering the top of the accommodating space 301. The first gear 31, the second gear 32, the third gear 33 and the fourth gear 34 are all accommodated in the accommodating space 301. The gear box 35 includes a bottom wall 351, an annular side wall 352 protruding upward from the periphery of the bottom wall 351, and two protrusions 353 protruding downward from two opposite ends of the bottom wall 351. The accommodating space 301 is formed between the bottom wall 351 and the annular side wall 352. The two protrusions 353 are respectively provided with an accommodating space 302 communicating with the accommodating space 301, and the accommodating space 302 passes through the corresponding protrusions 353 downward.

[0031] A boss 303 and a through hole 304 are also provided on the bottom wall 351 of the gear box 35. The boss 303 is arranged in a blind hole shape for cooperating with the impact protection component 20 to limit the first gear 31 in the up and down directions; the through hole 304 is correspondingly arranged at the bottom of the third gear 33, and the fixed shaft 37 is accommodated in the through hole 304 and locked with the bottom wall 351 of the gear box 35 by a screw 50. The third gear 33 is rotatably fixed on the fixed shaft 37, so as to ensure that the third gear 33 will not move arbitrarily in the gear box 35, nor will it be separated from the gear box 35.

[0032] The four sides of the cover plate 36 are fixed to the annular side wall 352 of the gear box 35 by screws to seal the accommodating space 301, so as to ensure that the first gear 31, the second gear 32, the third gear 33 and the fourth gear 34 can rotate stably in a certain space. The cover plate 36 is set as a horizontal plate structure, and is provided with a mounting hole 361 running through the top and bottom. The driving assembly 10 is fixed on the cover plate 36 and is fixedly connected to the cover plate 36 through the mounting hole 361. The motor shaft 12 passes downward through the mounting hole 361 and enters the interior of the accommodating space 301, is connected to the first gear 31, and then drives the first gear 31 to rotate.

[0033] like Figure 3 Combined with Figure 2 As shown, the impact protection assembly 20 includes a first bearing seat 21 and a second bearing seat 22 with a transition fit, and an elastic member 23 and a ball 24 located between the first bearing seat 21 and the second bearing seat 22. The first bearing seat 21 is provided with at least one protrusion 211. When the driving assembly 10 is driven normally, the ball 24 is pushed by the elastic member 23 to contact the protrusion 211 of the first bearing seat 21 to drive the transmission assembly 30 and the cutting assembly 40 to rotate synchronously; when the resistance encountered by the cutting assembly 40 is greater than a certain value, the elastic member 23 is continuously compressed and the ball 24 passes over the protrusion 211, and relative rotation occurs between the transmission assembly 30 and the driving assembly 10.

[0034] Specifically, the first bearing seat 21 includes a columnar main body 210 and an extension 212 extending outward from the outer wall of the main body 210, the extension 212 is arranged in an annular shape and has a diameter larger than the diameter of the main body 210. Three protrusions 211 are arranged and evenly distributed on the upper surface of the extension 212, and the extension 212 is also provided with a slide groove 213 for the ball 24 to slide, the slide groove 213 is arranged in an annular shape and passes over the protrusion 211, that is, the protrusion 211 is also provided with a slide groove 213, so that the ball 24 can slide between two adjacent protrusions 211 along the slide groove 213, and can also directly pass over the protrusion 211 along the slide groove 213.

[0035] The main body 210 is provided with an inner cavity 214 and two grooves 215 which are recessed outward from the inner wall of the main body 210 . A flat key 216 is accommodated in each groove 215 . One end of the motor shaft 12 is inserted into the inner cavity 214 and abutted against the two flat keys 216 . In this way, torque can be transmitted between the motor shaft 12 and the first bearing seat 21 through the flat keys 216 .

[0036] The second bearing seat 22 is sleeved on the outside of the main body 210 of the first bearing seat 21 and cooperates with the extension portion 212. The second bearing seat 22 is provided with a boss 221, and the elastic member 23 and the ball 24 are both accommodated in the boss 221, that is, when the second bearing seat 22 is sleeved on the first bearing seat 21, the ball 24 contacts the slide groove 213 on the first bearing seat 21 and the ball 24 is at least partially accommodated in the boss 221, and the elastic member 23 is compressed and limitedly accommodated between the boss 221 and the ball 24. In this embodiment, there are three bosses 221, three elastic members 23 and three balls 24 respectively, corresponding to the three protrusions 211, but this should not be limited to this.

[0037] The second bearing seat 22 and the first gear 31 are fixed by screw locking, and the first bearing seat 21 and the motor shaft 12 are fixed by two flat keys 216, so that the entire impact protection assembly 20 will not fall off and has better stability.

[0038] like Figure 2 and Figure 4 As shown, in order to further protect the transmission assembly 30, the present application also adds a locking structure (as a part of the impact protection assembly 20) between the transmission assembly 30 and the cutting assembly 40. The rotation direction of the locking structure is opposite to the rotation direction of the cutting assembly 40. Therefore, when the cutting assembly 40 collides with a hard object, the locking structure is directly locked, and part of the instantaneous impact force is transferred to the gear box 35, thereby reducing the impact on the transmission assembly 30.

[0039] Specifically, the impact protection component 20 also includes a driving shaft 25 connecting the transmission component 30 and the cutting component 40 and a one-way bearing 26 sleeved on the driving shaft 25. When the driving component 10 is driven normally, the transmission component 30 drives the driving shaft 25, the one-way bearing 26 and the cutting component 40 to rotate synchronously. When the resistance encountered by the cutting component 40 is greater than a certain value, the one-way bearing 26 locks the driving shaft 25 to prevent the transmission component 30 from being affected by the instantaneous impact force.

[0040] like Figures 4 to 7 Combined with Figure 2As shown, the cutting assembly 40 includes a first blade 41 connected to the second gear 32 and a second blade 42 connected to the fourth gear 34. Since the second gear 32 and the fourth gear 34 rotate in opposite directions, the first blade 41 and the second blade 42 are perpendicular to each other and rotate in opposite directions in the same plane.

[0041] The first blade 41 includes a first blade 411, a first fixing seat 412 located above the first blade 411 to limit the first blade 411, a first gasket 413 located below the first blade 411, and a first nut 414 used to lock and fix the first gasket 413, the first blade 411, and the first fixing seat 412. The second blade 42 includes a second blade 421, a second fixing seat 422 located above the second blade 421 to limit the second blade 421, a second gasket 423 located below the second blade 421, and a second nut 424 used to lock and fix the second gasket 423, the second blade 421, and the second fixing seat 422. Both the first blade 411 and the second blade 421 are used to cut grass blades, and the rotation speeds of the two blades are the same and the rotation directions are opposite.

[0042] Since the cutting assembly 40 includes a first blade 41 and a second blade 42, two drive shafts 25 are correspondingly provided, namely a first drive shaft 251 connected between the second gear 32 and the first blade 411, and a second drive shaft 252 connected between the fourth gear 34 and the second blade 421; the one-way bearings 26 are also correspondingly provided with two, namely a first one-way bearing 261 sleeved on the first drive shaft 251, and a second one-way bearing 262 sleeved on the second drive shaft 252.

[0043] The first drive shaft 251 is received in the receiving space 302 of one of the protrusions 353 of the gear box 35, and the top end is fixedly connected to the second gear 32 through the bearing seat 271 and the end cover 272, and the bottom end protrudes downward beyond the protrusion 353, and passes through the first fixing seat 412 to connect with the first blade 411, and finally passes through the first gasket 413 and is locked and fixed with the first nut 414, so that the first blade 411 is locked and fixed to the first drive shaft 251. The first one-way bearing 261 is located at the lower end of the first drive shaft 251 and is arranged close to the first fixing seat 412. When the first drive shaft 251 rotates driven by the second gear 32, it can drive the first blade 41 to rotate as a whole, and the first blade 411 performs a cutting action.

[0044] The second drive shaft 252 is received in the receiving space 302 of another protrusion 353 of the gear box 35, and the top end is also fixedly connected to the fourth gear 34 through the bearing seat 271 and the end cover 272, and the bottom end protrudes downward beyond the protrusion 353, and passes through the second fixing seat 422 to connect with the second blade 421, and finally passes through the second gasket 423 and is locked and fixed with the second nut 424, so that the second blade 421 is locked and fixed to the second drive shaft 252. The second one-way bearing 262 is located at the lower end of the second drive shaft 252 and is arranged close to the second fixing seat 422. When the second drive shaft 252 rotates under the drive of the fourth gear 34, it can drive the second blade 42 to rotate as a whole, and the second blade 421 performs a cutting action.

[0045] When the driving assembly 10 is driven normally, first, the motor shaft 12 drives the first bearing seat 21 to rotate. When the first bearing seat 21 rotates until the ball 24 contacts the protrusion 211, the elastic member 23 is compressed, and the axial force exerted on the first gear 31 cannot continue to compress the elastic member 23, so that the ball 24 cannot pass over the protrusion 211 on the first bearing seat 21. At this time, the second bearing seat 22 and the first gear 31 rotate with the first bearing seat 21; then, driven by the first gear 31, the second gear 32, the third gear 33 and the fourth gear 34 rotate synchronously; finally, the second gear 32 drives the first driving shaft 251 and the first one-way bearing 261 to rotate, the first blade 411 rotates smoothly, the fourth gear 34 drives the second driving shaft 252 and the second one-way bearing 262 to rotate, and the second blade 421 rotates smoothly. At this time, the first blade 411 and the second blade 421 can perform mowing actions at the same time.

[0046] When the first blade 411 rotates at high speed, if it collides with a hard object instantly, the first blade 411 will quickly transfer the reverse axial force it receives to the second gear 32. The first gear 31 will also be subjected to a large axial force, which will instantly continue to compress the elastic member 23. The ball 24 passes over the protrusion 211 on the first bearing seat 21, so that no torque can be transmitted between the first bearing seat 21 and the second bearing seat 22. The first gear 31 slips, that is, the first bearing seat 21 and the second bearing seat 22 are unloaded, thereby protecting the first gear 31, the second gear 32, the third gear 33 and the fourth gear 34. In addition, the first blade 411 will also transmit the reverse axial force it receives to the first drive shaft 251 and the first one-way bearing 261. Since the first one-way bearing 261 can only rotate in one direction, the first one-way bearing 261 will lock the first drive shaft 251 under the action of a larger axial force. At this time, part of the axial force is dispersed to the gear box 35, so that the instantaneous impact force on the first gear 31, the second gear 32, the third gear 33 and the fourth gear 34 is very small, thereby protecting the first gear 31, the second gear 32, the third gear 33 and the fourth gear 34.

[0047] Similarly, when the second blade 421 rotates at high speed, if it collides with a hard object instantaneously, the elastic member 23 and the ball 24 can be used to unload the first bearing seat 21 and the second bearing seat 22; at the same time, the second one-way bearing 262 can be used to lock the second drive shaft 252, so that part of the instantaneous impact force is dispersed to the gear box 35, so that the instantaneous impact force on the first gear 31, the second gear 32, the third gear 33 and the fourth gear 34 is very small.

[0048] To sum up, the lawn mower of the present invention, on the one hand, arranges an elastic member 23 and a ball 24 between the first bearing seat 21 and the second bearing seat 22, and at the same time arranges a protrusion 211 on the first bearing seat 21, so that when the driving assembly 10 is driven normally, the ball 24 is pushed by the elastic member 23 to contact the protrusion 211 of the first bearing seat 21, and then drives the transmission assembly 30 and the cutting assembly 40 to rotate synchronously; and when the reaction force of the cutting assembly 40 caused by the external obstacle is greater than a certain value, the elastic member 23 is continuously compressed and the ball 24 passes over the protrusion 211, so that relative rotation is generated between the transmission assembly 30 and the driving assembly 10, unloading is realized, and the purpose of protecting the transmission assembly 30 is achieved.

[0049] On the other hand, by arranging a drive shaft 25 and a one-way bearing 26 sleeved on the drive shaft 25 between the transmission assembly 30 and the cutting assembly 40, when the driving assembly 10 is driven normally, the transmission assembly 30 drives the drive shaft 25, the one-way bearing 26 and the cutting assembly 40 to rotate synchronously; and when the reaction force of the cutting assembly 40 caused by the external obstacle is greater than a certain value, the one-way bearing 26 locks the drive shaft 25 to prevent the transmission assembly 30 from being affected by the instantaneous impact force, thereby achieving the purpose of protecting the transmission assembly 30.

[0050] 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, comprising a driving assembly, an impact protection assembly, a transmission assembly and a cutting assembly, characterized in that: The impact protection assembly includes a first bearing seat and a second bearing seat with a transition fit, and an elastic member and a ball located between the first bearing seat and the second bearing seat. The first bearing seat is provided with a protrusion and a slide groove for the ball to slide. The slide groove is arranged in an annular shape and passes over the protrusion. When the driving assembly is driven normally, the ball is pushed by the elastic member to contact the protrusion of the first bearing seat to drive the transmission assembly and the cutting assembly to rotate synchronously. When the resistance encountered by the cutting assembly is greater than a certain value, the elastic member is continuously compressed and the ball passes over the protrusion, and relative rotation occurs between the transmission assembly and the driving assembly.

2. The lawn mower according to claim 1, characterized in that: The driving assembly includes a motor and a motor shaft. One end of the motor shaft is inserted into the first bearing seat. A flat key is accommodated in the first bearing seat so that the motor shaft and the first bearing seat can transmit torque through the flat key.

3. The lawn mower according to claim 1, characterized in that: The second bearing seat is provided with a boss, and the elastic member and the ball are both accommodated in the boss. When the second bearing seat is sleeved on the first bearing seat, the ball contacts the first bearing seat, and the elastic member is limitedly accommodated between the boss and the ball.

4. The lawn mower according to claim 1, characterized in that: The impact protection component also includes a driving shaft connecting the transmission component and the cutting component and a one-way bearing sleeved on the driving shaft. When the driving component is driven normally, the transmission component drives the driving shaft, the one-way bearing and the cutting component to rotate synchronously. When the resistance encountered by the cutting component is greater than a certain value, the one-way bearing locks the driving shaft.

5. The push lawn mower according to claim 4, characterized in that: The transmission assembly includes a first gear connected to the second bearing seat and a second gear meshing with the first gear. The cutting assembly includes a first blade connected to the second gear. The drive shaft and the one-way bearing are connected between the second gear and the first blade.

6. The push lawn mower according to claim 5, characterized in that: The transmission assembly also includes a third gear and a fourth gear, the third gear is meshed with the first gear and the fourth gear respectively, the cutting assembly also includes a second blade connected to the fourth gear, and the drive shaft and the one-way bearing are also connected between the fourth gear and the second blade.

7. The push lawn mower according to claim 6, characterized in that: The centers of the first gear, the second gear, the third gear and the fourth gear are located on the same straight line, and the first blade and the second blade are perpendicular to each other and rotate in opposite directions in the same plane.

8. The push lawn mower according to claim 6, characterized in that: The transmission assembly also includes a gear box with an accommodating space and a cover plate for covering the top of the accommodating space. The gear box includes a bottom wall, an annular side wall protruding upward from the periphery of the bottom wall, and two protrusions protruding downward from two opposite ends of the bottom wall. The accommodating space is formed between the bottom wall and the annular side wall. The drive assembly is fixed on the cover plate, and two drive shafts protrude downward beyond the corresponding protrusions.

9. The push lawn mower according to claim 8, characterized in that: The first gear, the second gear, the third gear and the fourth gear are accommodated in the accommodation space, and the second gear and the third gear are arranged on opposite sides of the first gear, and the fourth gear is arranged away from the first gear.

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