Lawn mower with quick release structure

Abstract

A mowing machine with a quick release structure comprises a mowing machine body, a chassis and a driving shaft extending to the chassis, a mounting hole is formed in the end of the driving shaft, the mowing machine further comprises a cutter head, a cover plate and at least two blades, the cutter head is located below the driving shaft, and a counter bore allowing the driving shaft to be connected in an inserted mode is formed in the middle of the upper side of the cutter head. At least two cutter grooves distributed at intervals in the circumferential direction are formed in the lower side of the cutter disc, the cutter grooves are provided with downward anti-disengaging columns, the blades correspond to the cutter grooves one by one, the blades are provided with bearing sections clamped to the cutter grooves, and the bearing sections are provided with anti-disengaging holes allowing the anti-disengaging columns to be connected in an inserted mode. The width of the bearing section is smaller than that of the cutter groove so that a gap area can be formed between one side of the bearing section and the wall of the cutter groove. A through hole corresponding to the mounting hole is formed in the middle of the cover plate, a fastening bolt inserted into the mounting hole is arranged in the through hole, the cover plate is provided with a limiting rib corresponding to the gap area, and the fastening bolt changes the insertion depth relative to the mounting hole so as to adjust the pressing degree of the upper side of the cover plate to the bearing section and the pressing degree of the limiting rib to one side of the bearing section.

Description

Technical Field

[0001] This invention relates to the technical field of lawnmowers, and more specifically to a lawnmower with a quick-release structure. Background Technology

[0002] As a commonly used garden maintenance device, the core function of a lawnmower is to cut weeds using high-speed rotating blades. A typical lawnmower usually consists of a main body with a motor and a chassis at the bottom of the main body. The chassis contains a drive shaft connected to the motor, which drives the blades to rotate, thus achieving the mowing function.

[0003] There are two main ways to install lawnmower blades. One method involves setting a bolt in the center of a large blade, which is then connected to the drive shaft, allowing the blade to be directly mounted and fixed to the end of the drive shaft. This method is simple in structure and easy to install and remove, but when the blade needs to be replaced, the entire blade must be removed and replaced, resulting in relatively high maintenance costs. The other method involves setting a cutter disc at the end of the drive shaft, and then mounting several small blades onto the fastening structure of the cutter disc. Although this method makes the installation and removal process relatively cumbersome, only the small blades need to be replaced during maintenance, resulting in relatively low maintenance costs.

[0004] For the second installation method, several slots are usually set on the outer edge of the cutter head. Each slot has a mounting screw hole, and each small blade has an anti-disengagement hole at its mounting end. After the mounting end of the small blade is snapped into the corresponding slot, bolts are then passed through the anti-disengagement holes of the small blades one by one and screwed into the mounting holes to achieve the installation and fixation of the small blades relative to the cutter head.

[0005] However, this method has problems in practical applications: on the one hand, each bolt corresponding to a small-sized blade needs to be tightened, which is cumbersome, especially when multiple blades need to be replaced. The process of disassembling and assembling bolts one by one is extremely time-consuming, seriously affecting maintenance efficiency and user experience; on the other hand, dirt, sand, and other impurities being cut can easily splash and penetrate into the gap between the blade and the cutter groove. Especially in humid environments, these infiltrating impurities, after long-term contact with the metal parts, can cause corrosion or even "seize" between the blade and the cutter head. Once corrosion and seizing occur, subsequent blade disassembly becomes extremely difficult, and may even require destructive methods to complete the replacement. This not only increases maintenance costs but may also cause irreversible damage to the cutter head. Therefore, how to simplify the blade disassembly and assembly operation and effectively prevent impurities from entering while ensuring the reliability of blade fixation has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to provide a lawnmower with a quick-release structure that can both reliably fix the blades and allow for convenient assembly and disassembly.

[0007] To address the aforementioned problems, this invention provides a lawnmower with a quick-release structure, comprising a lawnmower body, a chassis, and a drive shaft extending to the chassis. The drive shaft has a mounting hole at its end. It also includes a blade disc, a cover plate, and at least two blades. The blade disc is located below the drive shaft. A countersunk hole for the drive shaft to insert is formed in the center of the upper side of the blade disc. At least two circumferentially spaced blade grooves are formed on the lower side of the blade disc. Each blade groove has a downward-facing anti-detachment post. The blades correspond to the blade grooves one by one, and each blade is secured to... The receiving section of the sipe has an anti-disengagement hole for inserting the anti-disengagement post. The width of the receiving section is smaller than the width of the sipe so that a gap area is formed between one side of the receiving section and the sipe wall. The middle part of the cover plate has a through hole corresponding to the mounting hole. The through hole has a fastening bolt inserted into the mounting hole. The cover plate has a limiting rib corresponding to the gap area. The fastening bolt adjusts the degree of compression of the upper part of the cover plate on the receiving section and the degree of compression of one side of the receiving section by changing the insertion depth of the fastening bolt relative to the mounting hole.

[0008] Compared with existing technologies, the above solution, by setting a cutter groove and an anti-detachment post on the underside of the cutter head, allows for easy installation. First, the receiving section of the cutter is inserted into the cutter groove, ensuring the anti-detachment post is inserted into the anti-detachment hole. At this point, a gap is formed between one side of the receiving section and the corresponding side of the groove wall. Then, a cover plate is placed under the cutter head, and a fastening bolt is inserted into the mounting hole. By adjusting the insertion depth of the fastening bolt relative to the mounting hole, the pressure of the cover plate relative to the receiving section and the pressure of the limiting rib on one side of the receiving section can be adjusted, effectively fixing the receiving section within the cutter groove. Furthermore, the cooperation between the anti-detachment post and the anti-detachment hole ensures the receiving section will not detach from the cutter groove, providing high reliability. When the cutter needs to be replaced, simply remove the cover plate, allowing the limiting rib to disengage from the gap area. The receiving section and the cutter groove then revert to a clearance fit, allowing all the receiving sections of the cutters to be easily removed from the groove, saving time and effort and effectively improving maintenance efficiency.

[0009] In an improved design, an elastic buffer layer is provided on the underside of the cutter head. This elastic buffer layer has the same shape as the underside of the cutter head, and the thickness of the receiving section is greater than the depth of the blade groove but less than the sum of the blade groove depth and the thickness of the elastic buffer layer. The elastic buffer layer allows for greater adjustment space on the cover plate, resulting in a tighter fit between the underside of the cutter head and the upper side of the cover plate. It also absorbs the vibration energy transmitted from the blades to the cutter head during lawnmower operation, reducing the risk of loosening of the fasteners due to vibration.

[0010] In an improved embodiment, the mounting hole is provided with an internal thread, and the fastening bolt includes a bolt and an annular protective cover. The protective cover abuts against the underside of the cover plate, and the nut end of the bolt abuts against the protective cover, while the screw end passes through the protective cover and the through hole and is screwed into the mounting hole. Thus, by rotating the bolt, the protective cover can push the cover plate closer to or away from the cutter head. That is, only one bolt needs to be tightened to simultaneously tighten or release multiple blades, which significantly simplifies the disassembly and assembly process and makes the operation simple and convenient.

[0011] In an improved embodiment, the elastic buffer layer is made of rubber, thus providing better elasticity.

[0012] In an improved embodiment, the limiting rib includes a reference surface abutting against the groove wall of the cutter and a limiting surface abutting against one side of the receiving section. The limiting surface gradually slopes from top to bottom toward the receiving section, so that when the cover plate is pressed against the cutter head, the pressing force of the limiting surface on the receiving section gradually increases. This inclined limiting surface design can generate a wedging effect during the gradual pressing of the cover plate, so that the receiving section of the blade is reliably locked in the cutter groove.

[0013] In an improved embodiment, the receiving section abuts against the corresponding groove wall of the blade groove on one side of the blade edge, and a gap area is formed between the receiving section and the corresponding groove wall on one side of the blade back. The position of the limiting rib corresponds to the corresponding gap area. Considering that the blade will be subject to resistance during the cutting operation, by setting the gap area on the receiving section corresponding to the blade back, the limiting rib can provide support for the receiving section of the blade, thereby improving the stability of the blade.

[0014] In an improved embodiment, the blade further includes a cutting section extending beyond the blade groove, the width of which is greater than the width of the blade groove, so that a stepped surface is formed between the cutting section and the receiving section. When the receiving section is fitted into the blade groove, the side of the blade groove corresponding to the outer peripheral wall of the blade disc is closed by the stepped surface of the corresponding blade, thereby effectively reducing the probability of impurities entering the blade groove. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a lawnmower with a quick-release mechanism. Figure 2 This is a top view schematic diagram of a lawnmower with a quick-release mechanism; Figure 3 For along Figure 2 Cross-sectional view of section AA in the middle; Figure 4 An exploded view of the upper side of the blade, cover plate, and blades of a lawnmower with a quick-release structure; Figure 5 An exploded view of the underside of the blade, cover plate, and blades of a lawnmower with a quick-release mechanism; Figure 6 This is a schematic diagram of the installation of the blade and blades of a lawnmower with a quick-release structure.

[0016] Explanation of reference numerals in the attached figures. 1. Lawn mower body; 2. Chassis; 21. Drive shaft; 21a. Mounting hole; 3. Cutter head; 31. Countersunk hole; 32. Cutter groove; 32a. Anti-detachment post; 32b. Gap area; 33. Elastic buffer layer; 4. Cover plate; 41. Through hole; 42. Limiting rib; 42a. Reference surface; 42b. Limiting surface; 5. Blade; 5a. Receiving section; 5b. Cutting section; 51. Anti-detachment hole; 52. Stepped surface; 6. Fastening bolt; 61. Bolt; 62. Protective cover. Detailed Implementation

[0017] It should be understood by those skilled in the art that the following embodiments are merely illustrative of the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0018] In the following description of the embodiments, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0019] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0020] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Please see Figures 1-6An embodiment of the present invention provides a lawnmower with a quick-release structure, including a lawnmower body 1, a chassis 2, and a drive shaft 21 extending to the chassis 2. The end of the drive shaft 21 is provided with a mounting hole 21a. It also includes a blade disc 3, a cover plate 4, and at least two blades 5. The blade disc 3 is located below the drive shaft 21. A countersunk hole 31 for the drive shaft 21 to be inserted is opened in the middle of the upper side of the blade disc 3. At least two circumferentially spaced blade grooves 32 are opened on the lower side of the blade disc 3. The blade grooves 32 are provided with downward anti-detachment posts 32a. The blades 5 correspond one to one of the blade grooves 32. The blades 5 are provided with receiving sections 5a that are snapped into the blade grooves 32. The receiving section 5a is provided with an anti-detachment hole 51 for the anti-detachment column 32a to be inserted. The width of the receiving section 5a is less than the width of the knife groove 32 so that a gap area 32b is formed between one side of the receiving section 5a and the groove wall of the knife groove 32. The middle part of the cover plate 4 is provided with a through hole 41 corresponding to the mounting hole 21a. The through hole 41 is provided with a fastening bolt 6 for inserting into the mounting hole 21a. The cover plate 4 is provided with a limiting rib 42 corresponding to the gap area 32b. The fastening bolt 6 adjusts the degree of pressing of the upper side of the cover plate 4 against the receiving section 5a and the degree of pressing of the limiting rib 42 against one side of the receiving section 5a by changing the insertion depth of the fastening bolt 6 relative to the mounting hole 21a.

[0022] The above solution involves setting a cutter groove 32 and an anti-detachment post 32a on the lower side of the cutter head 3. During installation, the receiving section 5a of the blade 5 is first inserted into the cutter groove 32, ensuring that the anti-detachment post 32a is inserted into the anti-detachment hole 51. At this time, a gap area 32b is formed between one side of the receiving section 5a and the corresponding side of the groove wall of the cutter groove 32. Then, the cover plate 4 is placed under the cutter head 3, and the fastening bolt 6 is inserted into the mounting hole 21a. By adjusting the insertion depth of the fastening bolt 6 relative to the mounting hole 21a, the tightness of the cover plate 4 relative to the receiving section 5a can be adjusted. The pressure exerted by the limiting rib 42 on one side of the receiving section 5a effectively fixes the receiving section 5a within the cutter groove 32. Furthermore, the cooperation between the anti-detachment post 32a and the anti-detachment hole 51 ensures that the receiving section 5a will not detach from the cutter groove 32, resulting in high reliability. When it is necessary to replace the blade 5, simply remove the cover plate 4, allowing the limiting rib 42 to detach from the gap area 32b. At this point, the receiving section 5a and the cutter groove 32 will revert to a clearance fit, making it easy to remove the receiving sections 5a of all blades 5 from the cutter groove 32. This method is convenient, labor-saving, and effectively improves maintenance efficiency.

[0023] In this embodiment, the upper end of the drive shaft 21 is connected to the motor inside the lawnmower body 1, thereby driving the drive shaft 21 to rotate at high speed through the motor inside the lawnmower body 1.

[0024] In this embodiment, both the cutter head 3 and the cover plate 4 are preferably circular, and the cutter grooves 32 are distributed circumferentially at intervals on the lower outer edge of the cutter head 3. Of course, the cutter head 3 and the cover plate 4 can also be hexagonal or other polygonal shapes, and this design does not limit them.

[0025] For example, when the cutter head 3 is hexagonal, there are preferably six cutter grooves 32, and there is one cutter groove 32 at the middle of each side of the cutter head 3. The same applies to other shapes.

[0026] Combination Figure 6 As shown, in this embodiment, an elastic buffer layer 33 is provided on the lower side of the cutter head 3. The elastic buffer layer 33 is preferably rubber, but it can also be other materials with similar elastic properties. The elastic buffer layer 33 has the same shape as the lower side of the cutter head 3, that is, the elastic buffer layer 33 has notches corresponding to the cutter groove 32 and the countersunk hole 31. The receiving section 5a of the blade 5 has a certain thickness, usually 5 to 12 mm. The thickness of the receiving section 5a is greater than the groove depth of the cutter groove 32 and less than the sum of the groove depth of the cutter groove 32 and the thickness of the elastic buffer layer 33. In this embodiment, the groove depth of the cutter groove 32 is 6 mm, the thickness of the receiving section 5a is 7.5 mm, and the thickness of the elastic buffer layer 33 is 1.8 mm.

[0027] The elastic buffer layer 33 provides the cover plate 4 with a larger adjustment space, making the lower side of the cutter head 3 and the upper side of the cover plate 4 more tightly connected. At the same time, it can absorb the vibration energy transmitted from the blade 5 to the cutter head 3 during lawnmower operation, effectively reducing the noise of the whole machine and reducing the risk of loosening of the fasteners due to vibration.

[0028] Mounting hole 21a is located at the lower end of drive shaft 21. In this embodiment, mounting hole 21a has internal threads. Fastening bolt 6 includes bolt 61 and an annular cover 62. Cover 62 abuts against the lower side of cover plate 4. The nut end of bolt 61 abuts against cover 62, and the screw end passes through cover 62 and through hole 41 and is screwed into mounting hole 21a. Thus, by rotating bolt 61, cover 62 can push cover plate 4 closer to or away from cutter head 3. That is, only one bolt 61 needs to be turned to simultaneously tighten or release multiple blades 5, which significantly simplifies the disassembly and assembly process and makes operation simple and convenient.

[0029] Of course, in other embodiments, the fastening bolt 6 can also be in other forms, and this design does not limit this. For example, the fastening bolt 6 can be a pin, which is inserted into the mounting hole 21a by means of an interference fit, thereby realizing the connection between the drive shaft 21 and the cutter head 3 and the cover plate 4.

[0030] Combination Figure 4 As shown, in this embodiment, the limiting rib 42 extends approximately radially along the cover plate 4. The limiting rib 42 includes a reference surface 42a abutting against the groove wall of the cutter groove 32 and a limiting surface 42b abutting against one side of the receiving section 5a. The limiting surface 42b gradually slopes from top to bottom toward the receiving section 5a, so that when the cover plate 4 is pressed against the cutter head 3, the pressing force of the limiting surface 42b on the receiving section 5a gradually increases. This inclined limiting surface 42b design can generate a wedging effect during the gradual pressing of the cover plate 4, so that the receiving section 5a of the blade 5 is reliably locked in the cutter groove.

[0031] To ensure that the reference surface 42a abuts against the groove wall of the tool groove 32 while the limiting surface 42b abuts against the receiving section 5a, those skilled in the art should understand that the maximum width between the reference surface 42a and the limiting surface 42b should be greater than the width of the gap area 32b.

[0032] In this embodiment, the receiving section 5a abuts against the corresponding groove wall of the blade groove 32 on one side of the cutting edge of the blade 5, and a gap area 32b is formed between the receiving section 5a and the corresponding groove wall on one side of the back of the blade 5, and the position of the limiting rib 42 corresponds to the corresponding gap area 32b.

[0033] Considering the resistance the blade 5 will experience during cutting, the gap area 32b is positioned on the side of the receiving section 5a corresponding to the back of the blade 5. This allows the limiting rib 42 to provide support for the receiving section 5a of the blade 5, improving the stability of the blade 5. Specifically, when the blade 5 is subjected to an impact force towards the back of the blade during cutting, the limiting rib 42 can effectively counteract this impact force, preventing the blade 5 from shifting and further enhancing the safety and reliability of the cutting process.

[0034] As an improvement to this embodiment, the blade 5 also includes a cutting section 5b extending outside the blade groove 32. The width of the cutting section 5b is greater than the width of the blade groove 32, so that a stepped surface 52 is formed between the cutting section 5b and the receiving section 5a. When the receiving section 5a is embedded in the blade groove 32, the side of the blade groove 32 corresponding to the outer peripheral wall of the blade disc 3 is closed by the stepped surface 52 of the corresponding blade 5. This can significantly prevent soil, sand, grass clippings and other debris splashed during the grass cutting process from entering the interior of the blade groove 32, avoiding rust and jamming caused by the accumulation of impurities, and extending the service life of the blade 5 and the blade disc 3.

[0035] It should be noted that in the description of this application, the terms "inner" and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. All directional indications (such as up, down, left, right, front, back, inner, and outer) are only used to explain the relative positional relationships and movement between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0037] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A lawnmower with a quick-release structure, comprising a lawnmower body (1), a chassis (2), and a drive shaft (21) extending to the chassis (2), wherein the end of the drive shaft (21) is provided with a mounting hole (21a), characterized in that, It also includes a cutter head (3), a cover plate (4), and at least two blades (5). The cutter head (3) is located below the drive shaft (21). A countersunk hole (31) for the drive shaft (21) to be inserted is provided in the middle of the upper side of the cutter head (3). At least two circumferentially spaced cutting grooves (32) are provided on the lower side of the cutter head (3). Each cutting groove (32) has a downward-facing anti-detachment post (32a). Each blade (5) corresponds to a cutting groove (32). Each blade (5) has a receiving section (5a) that is snapped into the cutting groove (32). The receiving section (5a) has an anti-detachment hole (51) for the anti-detachment post (32a) to be inserted. a) The width is less than the width of the groove (32) so that a gap area (32b) is formed between one side of the receiving section (5a) and the groove wall of the groove (32); the middle part of the cover plate (4) is provided with a through hole (41) corresponding to the mounting hole (21a), the through hole (41) is provided with a fastening bolt (6) inserted into the mounting hole (21a), the cover plate (4) is provided with a limiting rib (42) corresponding to the gap area (32b), the fastening bolt (6) adjusts the degree of pressing of the upper side of the cover plate (4) against the receiving section (5a) and the degree of pressing of the limiting rib (42) against one side of the receiving section (5a) by changing the insertion depth of the fastening bolt (6) relative to the mounting hole (21a).

2. The lawnmower with quick-release structure according to claim 1, characterized in that, The cutter head (3) is provided with an elastic buffer layer (33) on the lower side. The elastic buffer layer (33) has the same shape as the lower side of the cutter head (3). The thickness of the receiving section (5a) is greater than the groove depth of the cutter groove (32) and less than the sum of the groove depth of the cutter groove (32) and the thickness of the elastic buffer layer (33).

3. The lawnmower with quick-release structure according to claim 2, characterized in that, The mounting hole (21a) is provided with an internal thread. The fastening bolt (6) includes a bolt (61) and an annular cover (62). The cover (62) abuts against the lower side of the cover plate (4). The nut end of the bolt (61) abuts against the cover (62) and the screw end passes through the cover (62) and the through hole (41) before being screwed into the mounting hole (21a).

4. The lawnmower with a quick-release structure according to claim 2 or 3, characterized in that, The elastic buffer layer (33) is made of rubber.

5. The lawnmower with a quick-release structure according to any one of claims 1-3, characterized in that, The limiting rib (42) includes a reference surface (42a) that abuts against the groove wall of the cutter groove (32) and a limiting surface (42b) that abuts against one side of the receiving section (5a). The limiting surface (42b) gradually tilts from top to bottom toward the receiving section (5a) so that when the cover plate (4) is pressed against the cutter disc (3), the pressing force of the limiting surface (42b) on the receiving section (5a) gradually increases.

6. The lawnmower with a quick-release structure according to any one of claims 1-3, characterized in that, The receiving section (5a) abuts against the corresponding groove wall of the blade groove (32) on one side of the blade edge (5), and a gap area (32b) is formed between the receiving section (5a) and the corresponding groove wall on one side of the blade back (5). The position of the limiting rib (42) corresponds to the corresponding gap area (32b).

7. The lawnmower with a quick-release structure according to any one of claims 1-3, characterized in that, The blade (5) also includes a cutting segment (5b) extending out of the groove (32), the width of the cutting segment (5b) being greater than the width of the groove (32) so that a stepped surface (52) is formed between the cutting segment (5b) and the receiving segment (5a), and when the receiving segment (5a) is fitted into the groove (32), the side of the groove (32) corresponding to the outer peripheral wall of the cutter head (3) is closed by the stepped surface (52) of the corresponding blade (5).

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