Grass mower capable of driving double blades

Abstract

The utility model discloses a lawnmower for driving double blades, which belongs to the technical field of lawnmowers, solves the problem that a transmission mechanism in the prior art is complicated, 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 on the fixed blade through a rotating shaft, and the fixed blade is hinged on the rotating shaft. 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] This utility model relates to the field of lawnmower technology, and in particular to a lawnmower with a dual-blade drive. Background Technology

[0002] To improve lawn mowing efficiency, existing technologies typically employ dual-blade lawnmowers. For example, utility model patent CN207099687U discloses a lawnmower that drives dual blades, including a lower blade and two oscillating upper blades. The motor's power drives two eccentric wheels through two gearboxes, and the two upper blades are driven independently by the two eccentric wheels. This makes the entire transmission mechanism quite complex. The complex structure not only increases the difficulty of design and manufacturing but also raises maintenance costs. Utility Model Content

[0003] The purpose of this invention is to provide a lawnmower with dual-blade drive, which solves the problem of complex transmission mechanisms in the prior art and simplifies the structure of the transmission mechanism.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a lawnmower with driven double blades, comprising a fixed blade and two oscillating movable blades, the two movable blades being hinged to the fixed blade via a rotating shaft, and further comprising a driving mechanism and an eccentric block driven by the driving mechanism, the eccentric block being provided with two connecting rods, one end of the two connecting rods being connected to the eccentric block, and the other end of the two connecting rods being respectively hinged to the two movable blades, the eccentric block driving the connecting rods to rotate synchronously, so that the other end of the connecting rods drives the movable blades to oscillate around the axis of the rotating shaft.

[0005] After adopting the above technical solution, the present invention has the following advantages: only a single drive mechanism drives a single eccentric block, and the single eccentric block drives two moving blades simultaneously through two connecting rods, which reduces the number of mechanical parts and makes the overall structure simpler. Reducing the number of parts usually means reducing manufacturing costs. 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 blades can be adjusted more easily to adapt to different mowing needs.

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

[0007] By employing the aforementioned technical solution, the staggered arrangement of the two eccentric wheels allows the two moving blades to 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 their fixed connection ensures that the moving blades driven by the two connecting rods remain synchronized during movement, improving the uniformity and consistency of grass cutting.

[0008] Furthermore, the two eccentric wheels are opposed at an angle of 180°.

[0009] Using the aforementioned technical solution, the eccentricity between the two eccentric wheels is maximized, allowing the two moving blades to cover a wider shearing width and improving shearing efficiency.

[0010] Furthermore, the two eccentric wheels are arranged vertically, and the end of the connecting rod that is connected to the moving blade abuts against the moving blade. The surfaces on the two connecting rods that abut against the moving blade are at the same height so that the two moving blades are at the same height.

[0011] By adopting the aforementioned technical solution, the surfaces on the two connecting rods that abut against the moving blades are at the same height, which can avoid the installation height difference caused by the vertical arrangement of the two eccentric wheels. This ensures that the two moving blades maintain the same height during operation, which helps to achieve a uniform shearing effect and minimizes uneven shearing caused by inconsistent heights.

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

[0013] By adopting the aforementioned 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 at the middle of the moving blade, this design can significantly shorten the length of the connecting rod, making the entire transmission mechanism more compact, reducing space occupation, and improving 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 moving blade is hinged to a first connector and a connecting rod. The rear of the moving blade is provided with a second connecting hole through which the first connector passes. The second connecting hole is an irregularly shaped hole. The shape of the first connector is matched with the shape of the second connecting hole to restrict the rotation of the first connector relative to the moving blade.

[0015] By adopting the aforementioned technical solution, the cooperation between the first connector and the irregular hole can effectively prevent the first connector from rotating relative to the moving blade and causing the connecting rod to spin freely, ensuring that the connecting rod can drive the first connector and the moving blade to rotate simultaneously, thereby ensuring the swing stability of the moving blade.

[0016] Furthermore, the drive mechanism includes a motor, a first gear mounted 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 aforementioned technical solution, the reduction ratio can be flexibly changed by adjusting the gear ratio through the meshing of multiple gears, and multi-stage reduction can be achieved. This reduces the high speed of the motor to a lower speed suitable for the operation of the moving blade, thereby increasing the torque and ensuring that the moving blade has sufficient force for shearing. The second and third gears, as intermediate gears, can distribute the load of the first and fourth gears, reducing stress concentration on individual gears.

[0018] Furthermore, 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] Using the aforementioned technical solution, since the first gear meshes with the second gear, the small gear drives the large gear, which will achieve a deceleration effect. 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 force to cut. Since the third gear meshes with the fourth gear, the small gear drives the large gear, which will achieve a deceleration effect, thus achieving two-stage 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 force to cut.

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

[0021] By adopting the aforementioned technical solution, since the second and third gears are coaxial, reducing the diameter of the third gear can further reduce the speed of the fourth gear.

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

[0023] By adopting the aforementioned technical solution, the limiting component ensures that the eccentric block remains in a fixed position in the axial direction, reducing the change in the position of the moving blade caused by the movement of the eccentric block. This helps the moving blade maintain a consistent height and angle as much as possible during the shearing process, improving the stability of the shearing process and making the lawnmower quieter during operation. Attached Figure Description

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

[0025] Figure 1This is a schematic diagram of the structure of the lawnmower with dual blades driven by this utility model;

[0026] Figure 2 This is an exploded view of the structure of the lawnmower part that drives the double blades in this utility model;

[0027] Figure 3 This is an exploded view of the drive mechanism for the lawnmower that drives the double blades in this utility model;

[0028] Figure 4 This is a schematic diagram of the eccentric block in this utility model;

[0029] Figure 5 This is a schematic diagram of the connecting rod in this utility model;

[0030] Figure 6 This is a schematic diagram of the moving blade in this utility model;

[0031] Figure 7 This is a schematic diagram of the fixed blade in this utility model;

[0032] Figure 8 This is a cross-sectional view of the lawnmower with dual blades driven in this utility model;

[0033] Figure 9 This is a cross-sectional view from another perspective of the lawnmower with dual blades driven in this utility model;

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

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

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

[0037] It should be understood that in the various embodiments of this utility model, the number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this utility model.

[0038] It should be understood that in this invention, "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product or device.

[0039] It should be understood that in this utility model, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, or Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains X, Y, and Z", "Contains X, Y, and Z" means that all three X, Y, and Z are contained; "Contains X, Y, or Z" means that one of X, Y, and Z is contained; "Contains X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are contained.

[0040] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be selected to be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0041] like Figures 1 to 9As shown, this utility model provides a lawnmower with a dual-blade drive, including a handle 30, rollers 31 on both sides of the handle 30, and a housing 32 between the rollers 31. The housing 32 contains a fixed blade 10 and two movable blades 11 that can swing. The two movable blades 11 are hinged to the fixed blade 10 via a rotating shaft 271. The model also includes a drive mechanism and an eccentric block 20 driven by the drive mechanism. The eccentric block 20 has 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 the two movable blades 11. The eccentric block 20 drives the connecting rods 21 to rotate synchronously, so that the other end of the connecting rods 21 drives the movable blades 11 to swing around the axis of the rotating shaft 271.

[0042] A single drive mechanism drives a single eccentric block 20, which in turn drives two moving blades 11 simultaneously via two connecting rods 21. This reduces the number of mechanical parts, making the overall structure simpler. Reducing the number of parts usually means lower manufacturing costs. Fewer parts need to be processed and assembled, thus reducing production costs and making maintenance simpler. By adjusting the position of the eccentric block 20 and the length of the connecting rods 21, the swing amplitude and frequency of the moving blades 11 can be adjusted more easily to adapt to different mowing needs.

[0043] It should be noted that the housing 32 is also provided with a blade holder 12, on which the moving blade 11 and the fixed blade 10 are mounted to improve the installation stability of the moving blade 11 and the fixed blade 10. The fixed blade 10 is located below the moving blade 11.

[0044] The eccentric block 20 includes two fixedly connected eccentric wheels 201, which are arranged in an alternating pattern. The two connecting rods 21 are also staggered, allowing the two moving blades 11 to cover a wider 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 their fixed connection ensures that the moving blades 11 driven by the two connecting rods 21 move synchronously, 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, which can enable the two moving blades 11 to cover a larger shearing width and improve shearing efficiency.

[0046] To make the structure more compact, the middle part of the moving blade 11 is hinged to the fixed blade 10, and the rear part of the moving blade 11 is hinged to the connecting rod 21. This can significantly shorten the length of the connecting rod 21, making the entire transmission mechanism more compact, reducing space occupation, and improving the overall compactness of the equipment.

[0047] The moving blade 11 is hinged to the connecting rod 21 via a first connecting member 272. The first connecting member 272 can serve as a blade fixing sleeve. A first connecting hole 111 is provided in the middle of the moving blade 11, and a second connecting hole 112 is provided at the rear of the moving blade 11 for the first connecting member 272 to pass through. The second connecting hole 112 is an irregularly shaped hole. The shape of the first connecting member 272 matches the shape of the second connecting hole 112 to restrict the rotation of the first connecting member 272 relative to the moving blade 11. A third connecting hole 212 and a fourth connecting hole 213 are provided at both ends of the connecting rod 21, respectively. The fixed blade... 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, and the moving blade 11 is rotatably connected to the fixed blade 10. Other parts of the moving blade 11 are not connected to the fixed blade 10. 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, and the moving blade 11 is rotatably connected to the connecting rod 21. The third connecting hole 212 is sleeved on the eccentric wheel 201.

[0048] In this embodiment, the two eccentric wheels 201 are arranged vertically, resulting in different heights of the two connecting rods 21. The end of the connecting rod 21 that is connected to the moving blade 11 abuts against the moving blade 11, which in turn causes the two moving blades 11 to have different heights. Therefore, in this embodiment, the surfaces on the two connecting rods 21 that abut against the moving blade 11 are at the same height so that the two moving blades 11 are at the same height. This can solve the installation height difference caused by the vertical arrangement of the two eccentric wheels 201 and ensure that the two moving blades 11 maintain the same height during operation. This helps to achieve a uniform shearing effect and minimizes uneven shearing caused by inconsistent heights.

[0049] Specifically, in order to compensate for the difference in installation height caused by the vertical arrangement of the two eccentric wheels 201, a protrusion 211 is provided on one side of the surface of the connecting rod 21. In this embodiment, the two connecting rods 21 have the same structure. One connecting rod 21 has a surface with the protrusion 211 facing the moving blade 11 and abutting against the moving blade 11, while 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. This makes the height of the surfaces of the two connecting rods 21 that abut against the moving blade 11 the same, so that the two moving blades 11 are at the same height.

[0050] To improve the shearing effect, the drive mechanism includes a motor 26, a first gear 22 mounted 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 to the eccentric block 20 via a second connecting member 273. Through the meshing of multiple gears, the reduction ratio can be flexibly changed by adjusting the gear ratio, enabling multi-stage reduction and lowering the high speed of the motor 26 to a lower speed suitable for the operation of the moving blade 11. This increases torque and ensures that the moving blade 11 has sufficient force for shearing. The second gear 23 and the third gear 24, as intermediate gears, can distribute the load of the first gear 22 and the fourth gear 25, reducing stress concentration on individual gears.

[0051] It should be noted that in this embodiment, all gears are linear gears, and the motor 26 is mounted in a fixed manner.

[0052] Since the small gear drives the large gear, a speed reduction effect is achieved. Simultaneously, according to the basic principle of gear transmission, the torque increases while the speed reduction occurs. 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 sufficient force for shearing. Furthermore, the diameter of the third gear 24 is smaller than the diameter of the fourth gear 25, thereby achieving two-stage speed reduction, further ensuring that the moving blade 11 has sufficient force for shearing.

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

[0054] To improve shearing stability, the fourth gear 25 is located on one axial side of the eccentric block 20, and a limiting member is provided on the other axial side of the eccentric block 20 opposite to the fourth gear 25 to restrict the axial movement of the eccentric block 20. This reduces the positional change of the moving blade 11 caused by the movement of the eccentric block 20, which helps the moving blade 11 to maintain a consistent height and angle as much as possible during the cutting process, improves the stability of the shearing process, and also makes the lawnmower quieter when working.

[0055] To enhance the stability of the drive mechanism, a gear box 29 and a third connecting member 274 are also provided inside 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 via the third connecting member 274. The fourth gear 25 extends through the second connecting member 273 and is connected to the gear box 29 via the second connecting member 273. The second connecting member 273 and the third connecting member 274 can be locating pins.

[0056] The limiting component specifically includes a pad 281 and a rivet sleeve 282. The pad 281 abuts against the bottom of the eccentric block 20 and is fixed to the housing 32 by the rivet sleeve 282. The pad 281, the rivet 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 lawnmower is running, the motor 26 rotates, driving the first gear 22 at the output end to rotate. The first gear 22 meshes with the second gear 23 for first-stage reduction. The second gear 23 meshes with the fourth gear 25 through the third gear 24 for 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, causing the two moving blades 11 to complete reciprocating motion and realize the cutting action.

[0058] Understandably, 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, the difference in installation height caused by the vertical arrangement of the two eccentric wheels can be compensated by utilizing the different heights on both sides of the connecting rod, thus ensuring that the two moving blades maintain the same height during operation.

[0059] Understandably, in other embodiments, the different heights of the surfaces on the two connecting rods that abut against the eccentric wheels can compensate for the height difference caused by the vertical arrangement of the two eccentric wheels, making the heights of the surfaces on the two connecting rods that abut against the moving blades the same so that the two moving blades are at the same height.

[0060] Understandably, in other embodiments, multiple gears can be bevel gears to change the output direction of the motor, allowing the motor to change its installation direction according to the internal space of the lawnmower, making the lawnmower structure more compact.

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

[0062] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.

Claims

1. A lawnmower with a driven double blade, comprising a fixed blade (10) and two oscillating movable blades (11), the two movable blades (11) being hinged to the fixed blade (10) via a pivot (271), characterized in that, It also includes a drive mechanism and an eccentric block (20) driven by the drive mechanism. 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). The eccentric block (20) drives the connecting rods (21) to rotate synchronously, so that the other end of the connecting rods (21) drives the moving blades (11) to swing around the axis of the rotating shaft (271).

2. The lawnmower with dual blades according to claim 1, characterized in that, The eccentric block (20) includes two fixedly connected eccentric wheels (201), which are arranged in an alternating manner, and the rotation points of the two eccentric wheels (201) are on the same straight line.

3. The lawnmower with dual blades according to claim 2, characterized in that, The two eccentric wheels (201) are opposed at an angle of 180°.

4. The lawnmower with dual blades according to claim 2, characterized in that, The two eccentric wheels (201) are arranged vertically, and one end of the connecting rod (21) and the moving blade (11) abuts against the moving blade (11). The surfaces on the two connecting rods (21) that abut against the moving blade (11) are at the same height so that the two moving blades (11) are at the same height.

5. The lawnmower with dual blades according to claim 1, characterized in that, The middle part of the moving blade (11) is hinged to the fixed blade (10), and the rear part of the moving blade (11) is hinged to the connecting rod (21).

6. The lawnmower with dual blades according to claim 5, characterized in that, The moving blade (11) is hinged to the first connector (272) and the connecting rod (21). The rear of the moving blade (11) is provided with a second connecting hole (112) through which the first connector (272) passes. The second connecting hole (112) is an irregular hole. The shape of the first connector (272) is matched with the shape of the second connecting hole (112) to restrict the first connector (272) from rotating relative to the moving blade (11).

7. The lawnmower with dual blades according to claim 1, characterized in that, The drive mechanism includes a motor (26), a first gear (22) mounted 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 to the eccentric block (20) through a third connector (273).

8. The lawnmower with dual 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 lawnmower with dual 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 lawnmower with dual 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 is provided on the other axial side of the eccentric block (20) opposite to the fourth gear (25) to restrict the axial movement of the eccentric block (20).

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