Grass mower capable of driving double blades

Abstract

The invention discloses a lawnmower for driving double blades, belongs to the technical field of lawnmowers, solves the problem that a transmission mechanism in the prior art is relatively complex, and adopts the technical scheme that the lawnmower mainly comprises a fixed blade and two movable blades capable of swinging, the two movable blades are hinged to the fixed blade through rotating shafts, and the two movable blades are hinged to the fixed blade through rotating shafts. The device further comprises a driving mechanism and an eccentric block driven by the driving mechanism, two connecting rods are arranged on the eccentric block, one ends of the two connecting rods are connected to the eccentric block, the other ends of the two connecting rods are hinged to the two movable blades respectively, and the eccentric block drives the connecting rods to rotate synchronously. And the other end of the connecting rod drives the movable blade to swing around the axis of the rotating shaft. The structure of the transmission mechanism is simplified.

Description

Technical Field

[0001] The invention relates to the technical field of lawn mowers, in particular to a lawn mower driving double blades. Background Art

[0002] In order to improve the efficiency of mowing, double-blade lawn mowers are usually used in the prior art. For example, utility model patent CN207099687U discloses a double-blade driven lawn mower, including a lower blade and two swingable upper blades. The power of the motor drives two eccentric wheels respectively through two gear boxes, and the two upper blades are driven separately by the two eccentric wheels, making the entire transmission mechanism more complicated. The complex structure not only increases the difficulty of design and manufacturing, but also increases the maintenance cost. Summary of the invention

[0003] The object to be achieved by the present invention is to provide a lawn mower with a double-blade drive, which solves the problem of the relatively complicated transmission mechanism in the prior art and simplifies the structure of the transmission mechanism.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a driven double-blade lawn mower, comprising a fixed blade and two swingable movable blades, the two movable blades are hinged on the fixed blade through a rotating shaft, and also comprises a driving mechanism and an eccentric block driven by the driving mechanism, the eccentric block is provided with two connecting rods, one end of the two connecting rods is connected to the eccentric block, and the other ends of the two connecting rods are respectively hinged to the two movable blades, and the eccentric block drives the connecting rod to rotate synchronously so that the other end of the connecting rod drives the movable blade to swing around the axis of the rotating shaft.

[0005] After adopting the above technical scheme, the present invention has the following advantages: only a single driving mechanism is needed to drive a single eccentric block, and the single eccentric block can simultaneously drive two moving blades through two connecting rods, thereby reducing the number of mechanical parts and making the overall structure more concise. Reducing the number of parts usually means reducing manufacturing costs, and fewer parts need to be processed and assembled, thereby reducing production costs and making maintenance work simpler. By adjusting the position of the eccentric block and the length of the connecting rod, the swing amplitude and frequency of the moving blade can be more easily adjusted to meet different mowing requirements.

[0006] Furthermore, the eccentric block includes two fixedly connected eccentric wheels, the two eccentric wheels are arranged in a staggered manner, and the rotation points of the two eccentric wheels are on the same straight line.

[0007] By adopting the above technical solution, the two eccentric wheels are arranged in a staggered manner so that the two moving blades can cover a larger cutting width, thereby increasing the cutting area and improving work efficiency. The rotation points of the two eccentric wheels are on the same straight line, and the two eccentric wheels are fixedly connected, which can ensure that the moving blades driven by the two connecting rods remain synchronized during movement, thereby improving the uniformity and consistency of grass cutting.

[0008] Furthermore, the opposing angle between the two eccentric wheels is 180°.

[0009] By adopting the above-mentioned technical solution, the eccentric distance between the two eccentric wheels is the largest, so that the two movable blades can cover a larger shearing width and improve the shearing efficiency.

[0010] Furthermore, the two eccentric wheels are arranged up and down, one end of the connecting rod connected to the moving blade abuts against the moving blade, and the heights of the surfaces on the two connecting rods that abut against the moving blade are the same so that the two moving blades have the same height.

[0011] By adopting the above-mentioned technical solution, the heights of the surfaces on the two connecting rods that are used to abut against the moving blades are the same, which can avoid the installation height difference caused by the upper and lower arrangement of the two eccentric wheels, and ensure that the two moving blades maintain the same height when working, which helps to achieve a uniform shearing effect and minimize uneven shearing caused by inconsistent heights.

[0012] Furthermore, the middle part of the movable blade is hinged to the fixed blade, and the rear part of the movable blade is hinged to the connecting rod.

[0013] By adopting the above-mentioned technical solution, the hinge position of the connecting rod and the moving blade is set at the rear of the moving blade. Compared with setting it in the middle of the moving blade, this design can significantly shorten the length of the connecting rod, which makes the entire transmission mechanism more compact, reduces space occupancy, and improves the overall compactness of the equipment. By using the middle of the moving blade as a fulcrum, the movement of the moving blade is more stable.

[0014] Furthermore, the movable blade is hinged by a first connecting member and a connecting rod, and a second connecting hole is provided at the rear of the movable blade for the first connecting member to pass through, and the second connecting hole is an irregular hole, and the shape of the first connecting member is matched with the shape of the second connecting hole to limit the rotation of the first connecting member relative to the movable blade.

[0015] By adopting the above-mentioned technical solution, through the cooperation between the first connecting member and the special-shaped hole, it is possible to effectively prevent the first connecting member from rotating relative to the moving blade and causing the connecting rod to rotate idly, thereby ensuring that the connecting rod can drive the first connecting member and the moving blade to rotate at the same time, thereby ensuring the swing stability of the moving blade.

[0016] Furthermore, the driving mechanism includes a motor, a first gear provided on the output shaft of the motor, a second gear meshing with the first gear, a third gear coaxial with the second gear, and a fourth gear meshing with the third gear, the second gear and the third gear are fixedly connected, and the fourth gear is coaxially connected to the eccentric block through a third connecting member.

[0017] By adopting the above-mentioned technical solution, through the meshing of multiple gears, the reduction ratio can be flexibly changed by adjusting the gear tooth ratio, and multi-stage reduction can be achieved, so that the high speed of the motor can be reduced to a lower speed suitable for the operation of the moving blade. This can increase the torque and ensure that the moving blade has sufficient power for shearing. The second gear and the third gear serve as intermediate gears, which can share the load of the first gear and the fourth gear and reduce the stress concentration on a single gear.

[0018] Further, the diameter of the first gear is smaller than the diameter of the second gear, and the diameter of the third gear is smaller than the diameter of the fourth gear.

[0019] By adopting the above-mentioned technical solution, since the first gear is meshed with the second gear, a deceleration effect will be achieved when the small gear drives the large gear. At the same time, according to the basic principle of gear transmission, the torque will increase while decelerating, ensuring that the moving blade has enough power for shearing. Since the third gear is meshed with the fourth gear, a deceleration effect will be achieved when the small gear drives the large gear, thereby realizing secondary deceleration. At the same time, according to the basic principle of gear transmission, the torque will increase while decelerating, further ensuring that the moving blade has enough power for shearing.

[0020] Furthermore, the diameter of the second gear is greater than the diameter of the third gear.

[0021] By adopting the above technical solution, since the second gear and the third gear are coaxial, the diameter of the third gear can be reduced, and the speed of the fourth gear can be further reduced.

[0022] Furthermore, the fourth gear is located on one axial side of the eccentric block, and a limiting member arranged opposite to the fourth gear is provided on the other axial side of the eccentric block to limit the axial movement of the eccentric block.

[0023] By adopting the above-mentioned technical solution, the limiter ensures that the eccentric block remains in a fixed position in the axial direction, reducing the position change of the moving blade caused by the movement of the eccentric block. This helps the moving blade to maintain a consistent height and angle as much as possible during the shearing process, improves the stability of the shearing process, and also makes the lawn mower quieter when working. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the structure of a lawn mower driving double blades in the present invention;

[0026] Figure 2 An exploded view of the structure of a lawn mower driving double blades according to the present invention;

[0027] Figure 3 An exploded view of a driving mechanism of a lawn mower driving double blades according to the present invention;

[0028] Figure 4 It is a structural schematic diagram of the eccentric block in the present invention;

[0029] Figure 5 It is a structural schematic diagram of the connecting rod in the present invention;

[0030] Figure 6 It is a structural schematic diagram of the movable blade in the present invention;

[0031] Figure 7 It is a schematic diagram of the structure of the fixed blade in the present invention;

[0032] Figure 8 A cross-sectional view of a lawn mower driving double blades according to the present invention;

[0033] Fig. 9 A cross-sectional view of the lawn mower driving double blades according to the present invention from another perspective;

[0034] In the figure, 10, fixed blade; 101, fifth connecting hole; 11, movable blade; 111, first connecting hole; 112, second connecting hole; 12, blade seat; 20, eccentric block; 201, eccentric wheel; 21, connecting rod; 211, protrusion; 212, third connecting hole; 213, fourth connecting hole; 22, first gear; 23, second gear; 24, third gear; 25, fourth gear; 26, motor; 271, rotating shaft; 272, first connecting member; 273, second connecting member; 274, third connecting member; 281, pad; 282, riveting sleeve; 29, gear box; 30, handle; 31, roller; 32, housing. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein.

[0037] It should be understood that in various embodiments of the present invention, the size of the serial numbers of the processes does not mean the order of execution. The execution order of the processes should be determined by their functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0038] It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0039] It should be understood that in the present invention, "plurality" refers to two or more than two. "And / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0040] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0041] like Figures 1 to 9 As shown, the present invention provides a lawn mower with a driven double blade, comprising a handle 30, rollers 31 arranged on both sides of the handle 30 and a shell 32 arranged between the rollers 31, wherein a fixed blade 10 and two swingable movable blades 11 are arranged in the shell 32, wherein the two movable blades 11 are hinged on the fixed blade 10 through a rotating shaft 271, and further comprising a driving mechanism and an eccentric block 20 driven by the driving mechanism, wherein two connecting rods 21 are arranged on the eccentric block 20, wherein one end of the two connecting rods 21 is connected to the eccentric block 20, and the other ends of the two connecting rods 21 are respectively hinged to the two movable blades 11, and the eccentric block 20 drives the connecting rod 21 to rotate synchronously, so that the other end of the connecting rod 21 drives the movable blade 11 to swing around the axis of the rotating shaft 271.

[0042] Only a single driving mechanism is needed to drive a single eccentric block 20, and the single eccentric block 20 can simultaneously drive two moving blades 11 through two connecting rods 21, thereby reducing the number of mechanical parts and making the overall structure more concise. Reducing the number of parts usually means lower manufacturing costs, and fewer parts need to be processed and assembled, thereby reducing production costs and making maintenance work simpler. By adjusting the position of the eccentric block 20 and the length of the connecting rod 21, the swing amplitude and frequency of the moving blade 11 can be more easily adjusted to meet different mowing requirements.

[0043] It should be noted that a blade seat 12 is further provided in the housing 32 , and the movable blade 11 and the fixed blade 10 are mounted on the blade seat 12 to improve the installation stability of the movable blade 11 and the fixed blade 10 , and the fixed blade 10 is arranged below the movable blade 11 .

[0044] The eccentric block 20 includes two fixedly connected eccentric wheels 201. The two eccentric wheels 201 are arranged in a staggered manner, and the two connecting rods 21 are arranged in a staggered manner, so that the two moving blades 11 can cover a larger cutting width, thereby increasing the cutting area and improving work efficiency. The rotation points of the two eccentric wheels 201 are on the same straight line, and the two eccentric wheels 201 are fixedly connected, which can ensure that the moving blades 11 driven by the two connecting rods 21 remain synchronized during movement, thereby improving the uniformity and consistency of grass cutting.

[0045] Preferably, the opposing angle of the two eccentric wheels 201 is 180°, and the eccentric distance between the two eccentric wheels 201 is the largest, so that the two movable blades 11 can cover a larger shearing width and improve the shearing efficiency.

[0046] In order to make the structure more compact, the middle part of the movable blade 11 is hinged to the fixed blade 10, and the rear part of the movable blade 11 is hinged to the connecting rod 21, which can significantly shorten the length of the connecting rod 21. This makes the entire transmission mechanism more compact, reduces space occupancy, and improves the overall compactness of the equipment.

[0047] The movable blade 11 is hinged to the connecting rod 21 through a first connecting member 272. The first connecting member 272 can be a blade fixing sleeve. The middle of the movable blade 11 is provided with a first connecting hole 111. The rear of the movable blade 11 is provided with a second connecting hole 112 for the first connecting member 272 to pass through. The second connecting hole 112 is a special-shaped hole. The shape of the first connecting member 272 matches the shape of the second connecting hole 112 to limit the first connecting member 272 from rotating relative to the movable blade 11. The two ends of the connecting rod 21 are respectively provided with a third connecting hole 212 and a fourth connecting hole 213. The blade 10 is provided with a fifth connecting hole 101. During assembly, the first connecting hole 111 and the fifth connecting hole 101 are coaxial, the rotating shaft 271 is inserted into the first connecting hole 111 and the fifth connecting hole 101, the movable blade 11 is rotatably connected to the fixed blade 10, and other parts of the movable blade 11 are not connected to the fixed blade 10, and the second connecting hole 112 and the fourth connecting hole 213 are coaxial, the blade fixing sleeve is inserted into the second connecting hole 112 and the fourth connecting hole 213, the movable blade 11 is rotatably connected to the connecting rod 21, and the third connecting hole 212 is sleeved on the eccentric wheel 201.

[0048] In the present embodiment, the two eccentric wheels 201 are arranged up and down, resulting in different heights of the two connecting rods 21. One end of the connecting rod 21 connected to the moving blade 11 abuts against the moving blade 11, resulting in different heights of the two moving blades 11. For this reason, in the present embodiment, the heights of the surfaces on the two connecting rods 21 used to abut against the moving blade 11 are the same so that the two moving blades 11 are at the same height. This can solve the installation height difference caused by the up and down arrangement of the two eccentric wheels 201, and can ensure that the two moving blades 11 maintain the same height when working, which helps to achieve a uniform shearing effect and minimize uneven shearing caused by inconsistent heights.

[0049] Specifically, in order to compensate for the installation height difference caused by the upper and lower arrangement of the two eccentric wheels 201, a protrusion 211 is provided on the surface of one side of the connecting rod 21. In this embodiment, the two connecting rods 21 have the same structure, one of the connecting rods 21 has a surface with the protrusion 21 facing the moving blade 11 and abutting against the moving blade 11, and the other connecting rod 21 does not have a surface with the protrusion 211 facing the moving blade 11 and abutting against the moving blade 11, so that the heights of the surfaces on the two connecting rods 21 that abut against the moving blade 11 are the same so that the two moving blades 11 are at the same height.

[0050] In order to improve the shearing effect, the driving mechanism includes a motor 26, a first gear 22 arranged on the output shaft of the motor 26, a second gear 23 meshing with the first gear 22, a third gear 24 coaxial with the second gear 23, and a fourth gear 25 meshing with the third gear 24, the second gear 23 and the third gear 24 are fixedly connected, and the fourth gear 25 is coaxially connected with the eccentric block 20 through the second connecting member 273. Through the meshing of multiple gears, the reduction ratio can be flexibly changed by adjusting the gear ratio, and multi-stage reduction can be achieved, and the high speed of the motor 26 can be reduced to a lower speed suitable for the operation of the moving blade 11, so that the torque can be increased to ensure that the moving blade 11 has sufficient power for shearing. The second gear 23 and the third gear 24 serve as intermediate gears, which can share the load of the first gear 22 and the fourth gear 25 and reduce the stress concentration on a single gear.

[0051] It should be noted that, in this embodiment, the plurality of gears are linear gears, and the installation method of the motor 26 is fixed.

[0052] Since the small gear drives the large gear to achieve a deceleration effect, and according to the basic principle of gear transmission, the torque will increase while decelerating, preferably, the diameter of the first gear 22 is smaller than the diameter of the second gear 23, ensuring that the moving blade 11 has enough power for shearing. Furthermore, the diameter of the third gear 24 is smaller than the diameter of the fourth gear 25, thereby achieving a two-stage deceleration, further ensuring that the moving blade 11 has enough power for shearing.

[0053] The power of the second gear 23 is transmitted to the fourth gear 25 via the third gear 24 . Furthermore, the diameter of the second gear 23 is greater than the diameter of the third gear 24 , which can further reduce the speed of the fourth gear 25 .

[0054] In order to improve the shearing stability, the fourth gear 25 is located on one axial side of the eccentric mass 20, and a limiter is provided on the other axial side of the eccentric mass 20 opposite to the fourth gear 25 to limit the axial movement of the eccentric mass 20, thereby reducing the position change of the moving blade 11 caused by the movement of the eccentric mass 20. This helps the moving blade 11 to maintain a consistent height and angle as much as possible during the cutting process, thereby improving the stability of the shearing process and making the lawn mower quieter when working.

[0055] In order to make the driving mechanism more stable, a gear box 29 and a third connecting member 274 are further provided in the housing 32. The first gear 22, the second gear 23, the third gear 24 and the fourth gear 25 are installed in the gear box 29. The second gear 23 and the third gear 24 are connected to the gear box 29 through the third connecting member 274. The second connecting member 273 passes through the fourth gear 25, and the fourth gear 25 is connected to the gear box 29 through the second connecting member 273. The second connecting member 273 and the third connecting member 274 can be positioning pins.

[0056] Among them, the limiting part specifically includes a pad 281 and a riveted sleeve 282. The pad 281 rests on the bottom of the eccentric block 20 and is fixed to the shell 32 through the riveted sleeve 282. The pad 281, the riveted sleeve 282, the fourth connecting hole 213, the eccentric wheel 201, the fourth gear 25 and the second positioning pin are coaxial.

[0057] When the lawn mower is running, the motor 26 rotates to drive the first gear 22 at the output end to rotate, the first gear 22 is meshed with the second gear 23 to perform a first-stage reduction, the second gear 23 is meshed with the fourth gear 25 through the third gear 24 to perform a second-stage reduction, the fourth gear 25 rotates synchronously with the eccentric block 20, the eccentric block 20 drives the two connecting rods 21 to rotate, so that the two movable blades 11 complete reciprocating motion to achieve the shearing action.

[0058] It can be understood that in other embodiments, a recess is provided on the surface of one side of the connecting rod. By changing the installation direction of the connecting rod and utilizing the different heights on both sides of the connecting rod, the installation height difference caused by the upper and lower arrangement of the two eccentric wheels can be compensated, thereby ensuring that the two moving blades maintain the same height when working.

[0059] It can be understood that in other embodiments, the heights of the surfaces on the two connecting rods used to abut against the eccentric wheels are different, which can compensate for the installation height difference caused by the upper and lower arrangement of the two eccentric wheels, so that the heights of the surfaces on the two connecting rods used to abut against the moving blades are the same to make the two moving blades equal in height.

[0060] It can be understood that in other embodiments, multiple gears can use bevel gears to change the output direction of the motor, so that the motor can be installed in a different direction according to the internal space of the lawn mower, making the lawn mower structure more compact.

[0061] It can be understood that in other embodiments, the opposing angle of the two eccentric wheels can be a suitable angle such as 120°, 150°, etc.

[0062] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A driven double-blade lawn mower, comprising a fixed blade (10) and two swingable movable blades (11), wherein the two movable blades (11) are hinged to the fixed blade (10) via a rotating shaft (271), characterized in that: It also includes a driving mechanism and an eccentric block (20) driven by the driving mechanism, wherein the eccentric block (20) is provided with two connecting rods (21), one end of the two connecting rods (21) is connected to the eccentric block (20), and the other end of the two connecting rods (21) is respectively hinged to two moving blades (11), and the eccentric block (20) drives the connecting rod (21) to rotate synchronously, so that the other end of the connecting rod (21) drives the moving blade (11) to swing around the axis of the rotating shaft (271).

2. The lawn mower driving double blades according to claim 1, characterized in that: The eccentric block (20) comprises two fixedly connected eccentric wheels (201), the two eccentric wheels (201) are arranged in a staggered manner, and the rotation points of the two eccentric wheels (201) are on the same straight line.

3. The lawn mower driving double blades according to claim 2, characterized in that: The opposing angle of the two eccentric wheels (201) is 180°.

4. The lawn mower driving double blades according to claim 2, characterized in that: The two eccentric wheels (201) are arranged up and down, one end of the connecting rod (21) connected to the moving blade (11) abuts against the moving blade (11), and the heights of the surfaces on the two connecting rods (21) used to abut against the moving blade (11) are the same so that the two moving blades (11) are of the same height.

5. The lawn mower driving double blades according to claim 1, characterized in that: The middle part of the movable blade (11) is hinged to the fixed blade (10), and the rear part of the movable blade (11) is hinged to the connecting rod (21).

6. The lawn mower driving double blades according to claim 5, characterized in that: The movable blade (11) is hingedly connected via a first connecting member (272) and a connecting rod (21); a second connecting hole (112) is provided at the rear of the movable blade (11) for the first connecting member (272) to pass through; the second connecting hole (112) is a special-shaped hole; the shape of the first connecting member (272) is matched with the shape of the second connecting hole (112) to limit the first connecting member (272) from rotating relative to the movable blade (11).

7. The lawn mower driving double blades according to claim 1, characterized in that: The driving mechanism comprises a motor (26), a first gear (22) arranged on an output shaft of the motor (26), a second gear (23) meshing with the first gear (22), a third gear (24) coaxial with the second gear (23), and a fourth gear (25) meshing with the third gear (24), wherein the second gear (23) and the third gear (24) are fixedly connected, and the fourth gear (25) is coaxially connected with the eccentric block (20) via a third connecting member (273).

8. The lawn mower driving double blades according to claim 7, characterized in that: The diameter of the first gear (22) is smaller than the diameter of the second gear (23), and the diameter of the third gear (24) is smaller than the diameter of the fourth gear (25).

9. The lawn mower driving double blades according to claim 7, characterized in that: The diameter of the second gear (23) is greater than the diameter of the third gear (24).

10. The lawn mower driving double blades according to claim 7, characterized in that: The fourth gear (25) is located on one axial side of the eccentric block (20), and a limiting member arranged opposite to the fourth gear (25) is provided on the other axial side of the eccentric block (20) to limit the axial movement of the eccentric block (20).

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