A double-blade reversible cutting mechanism for a brush cutter

Abstract

This utility model discloses a double-blade reversible cutting mechanism for a brush cutter, including an operating lever, a working head, and blades. The working head includes a housing and a transmission assembly. The housing includes a main housing, a transmission housing, and a secondary housing. A connecting housing is provided on the top of the main housing. The main transmission assembly includes a main shaft, a first bevel gear, a first pulley, a second bevel gear, and a power shaft. The main shaft is located inside the main housing, the first bevel gear and the first pulley are located on the main shaft, and the second bevel gear is located at the end of the power shaft. The driven assembly includes a first transmission shaft, a second transmission shaft, a second pulley, a first spur gear, and a second spur gear. The first transmission is located inside the transmission housing, the second pulley and the first spur gear are located on the first transmission shaft, and the second transmission shaft is located inside the secondary housing. Two blades are included, respectively located at the bottom ends of the main shaft and the second transmission shaft. This utility model's double-blade reversible cutting mechanism for a brush cutter has strong cutting ability and a large cutting range, making cutting relatively easy.

Description

Technical Field

[0001] This utility model relates to the field of landscaping and greening maintenance, and in particular to a double-blade reversible cutting mechanism for a brush cutter. Background Technology

[0002] A brush cutter is a machine used for mowing grass and branches, primarily for landscaping maintenance, clearing shrubs from jungles, or tending large green belts along roadsides. The working head of a brush cutter typically has a single blade or nylon trimming rope. The blade can be used to cut shrubs and weeds; however, conventional single-blade brush cutters have relatively weak cutting power and a small cutting range, making it difficult to cut thicker shrubs. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a double-blade reversible cutting mechanism for a brush cutter, which has strong cutting ability and a large cutting range, making cutting relatively easy.

[0004] The technical solution of this utility model is as follows:

[0005] A double-blade reversible cutting mechanism for a brush cutter includes an operating lever, a working head, and blades, wherein the working head includes:

[0006] The outer casing includes a main casing, a transmission casing, and a secondary casing. A connecting casing for connecting an operating rod is provided on one side of the top of the main casing. The secondary casing is connected to one side of the bottom of the main casing through the transmission casing.

[0007] A transmission assembly includes a main transmission component and a driven component. The main transmission component includes a main shaft, a first bevel gear, a first pulley, a second bevel gear, and a power shaft. The main shaft is vertically disposed within a main housing. The first bevel gear is located at the top of the main shaft, and the first pulley is located at the bottom of the main shaft. The power shaft is located within an operating lever and extends to the main housing at its end. The second bevel gear is located at the end of the power shaft, and the first bevel gear meshes with the second bevel gear. The driven component includes a first transmission shaft, a second transmission shaft, a second pulley, a first spur gear, and a second spur gear. The first transmission shaft is vertically disposed within a transmission housing. The second pulley and the first spur gear are respectively disposed on the first transmission shaft, and a transmission belt is provided between the first pulley and the second pulley. The second transmission shaft is vertically disposed within a secondary housing, and the second spur gear is disposed on the second transmission shaft and meshes with the first spur gear. The bottom end of the main shaft extends to the outer side of the bottom of the main housing, and the bottom end of the second transmission shaft extends to the outer side of the bottom of the secondary housing.

[0008] The blade comprises two pieces, which are respectively mounted on the bottom end of the main shaft and the bottom end of the second drive shaft via a mounting structure.

[0009] In a further technical solution, the mounting structure includes an upper pad, a lower pad, and a fastening nut. The upper pad is fixedly sleeved on the main shaft and the second drive shaft, respectively. The blade is located at the bottom of the upper pad, and the lower pad is located at the bottom of the blade. The bottom end of the main shaft and the bottom end of the second drive shaft are respectively provided with external threads that match the fastening nut. The fastening nut is set close to the bottom of the lower pad through a threaded connection.

[0010] In a further technical solution, the first pulley and the second pulley are synchronous pulleys.

[0011] In a further technical solution, a support column is provided between the sub-shell and the operating rod.

[0012] In a further technical solution, the top of the transmission housing is provided with a threaded post, and an internal threaded cover is threadedly connected to the threaded post. The internal threaded cover is adapted to the external threads of the main shaft and the second transmission shaft.

[0013] In a further technical solution, the secondary housing is located on the side of the main housing facing the operating lever, and the operating lever is provided with a grass-blocking plate covering the side of the blade on the second drive shaft.

[0014] The beneficial effects of this utility model are:

[0015] 1. The power shaft can rotate to transmit power to the first bevel gear, causing the main shaft to rotate and drive the first pulley to rotate. The first drive shaft rotates through belt drive, and then drives the second drive shaft to rotate through gear drive. This causes the two blades on the main shaft and the second drive shaft to rotate in opposite directions, placing the object to be cut between the two blades for cutting. The cutting force is stronger, and the two blades cut side by side, resulting in a larger cutting range.

[0016] 2. The support column between the sub-housing and the operating lever provides support for the sub-housing, reduces the load on the sub-housing and transmission housing, and improves structural stability;

[0017] 3. The blades can be disassembled and installed separately depending on the usage. After removing the blades, the main shaft or the second drive shaft can be covered and protected using the internal threaded cover. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the double-blade reversible cutting mechanism of the brush cutter described in this embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the outer structure of the outer shell according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal transmission assembly of the housing according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 10. Operating lever; 11. Grass guard; 12. Support column; 20. Blade; 31. Main housing; 32. Transmission housing; 33. Secondary housing; 34. Connecting housing; 41. Main shaft; 42. First bevel gear; 43. First pulley; 44. Second bevel gear; 45. Power shaft; 46. First bearing; 47. Second bearing; 51. First drive shaft; 52. Second drive shaft; 53. Second pulley; 54. First spur gear; 55. Second spur gear; 56. Third bearing; 57. Fourth bearing; 60. Drive belt; 71. Upper pad; 72. Lower pad; 73. Fastening nut; 80. Threaded column; 81. Internal threaded cap. Detailed Implementation

[0023] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0024] Example:

[0025] like Figures 1-3As shown, a double-blade reversible cutting mechanism for a brush cutter includes an operating lever 10, a working head, and blades 20. The working head includes a housing and a transmission assembly. The housing includes a main housing 31, a transmission housing 32, and a secondary housing 33. The main housing 31 and the secondary housing 33 are cylindrical. A connecting housing 34 for connecting the operating lever 10 is obliquely opened on the top side of the main housing 31 near the operating lever 10. The secondary housing 33 is connected to one side of the bottom of the main housing 31 through the transmission housing 32, and the secondary housing 33 is on the same side as the connecting housing 34. The transmission assembly includes a main transmission component and a driven component. The main transmission component includes a main shaft 41 and a first bevel gear. 42. A first pulley 43, a second bevel gear 44, and a drive shaft 45 are included. The main shaft 41 is vertically installed inside the main housing 31. A first bearing 46 connecting the main shaft 41 is provided at the top inner side of the main housing 31. The first bevel gear 42 is located at the top of the main shaft 41 near the connecting housing 34. The first pulley 43 is located at the bottom of the main shaft 41, near the connection between the main housing 31 and the transmission housing 32. The drive shaft 45 is located inside the operating lever 10 (the drive shaft 45 is driven in the same way as the brush cutter in the prior art, with the engine driving the flexible shaft to provide power). The end of the drive shaft 45 extends into the main housing 31 and connects to the housing. The transmission housing 34 is equipped with a second bearing 47 connecting to the power shaft 45. A second bevel gear 44 is located at the end of the power shaft 45, and a first bevel gear 42 meshes with the second bevel gear 44. The driven components include a first transmission shaft 51, a second transmission shaft 52, a second pulley 53, a first spur gear 54, and a second spur gear 55. The first transmission shaft 51 is vertically installed inside the transmission housing 32. A third bearing 56 connecting the first transmission shaft 51 is located at the top of the transmission housing 32. The second pulley 53 and the first spur gear 54 are respectively installed on the first transmission shaft 51. A transmission belt 60 is provided between the first pulley 43 and the second pulley 54. The drive shaft 52 is vertically installed inside the sub-housing 33. The top of the sub-housing 33 is provided with a fourth bearing 57 that connects to the second drive shaft 52. The second spur gear 55 is installed on the second drive shaft 52 and meshes with the first spur gear 54. The bottom end of the main shaft 41 extends to the outer side of the bottom of the main housing 31, and the bottom end of the second drive shaft 52 extends to the outer side of the bottom of the sub-housing 33. The blade 20 includes two pieces, which are respectively installed on the bottom end of the main shaft 41 and the bottom end of the second drive shaft 52 through the mounting structure. The operating lever 10 is provided with a grass-blocking plate 11 covering the blade 20 on the second drive shaft 52. The grass-blocking plate 11 is located on the side away from the main housing 31.

[0026] In this embodiment, the mounting structure includes an upper pad 71, a lower pad 72, and a fastening nut 73. The upper pad 71 is fixedly sleeved on the main shaft 41 and the second drive shaft 52, respectively. The blade 20 is located at the bottom of the upper pad 71, and the lower pad 72 is located at the bottom of the blade 20. The bottom end of the main shaft 41 and the bottom end of the second drive shaft 52 are respectively provided with external threads that match the fastening nut 73. The fastening nut 73 is tightly attached to the bottom of the lower pad 72 through threaded connection.

[0027] The working principle of the above technical solution is as follows:

[0028] When using this cutting mechanism, the existing engine drives the flexible shaft to provide power to the power shaft 45, rotating the second bevel gear 44, which meshes with the first bevel gear 42, causing the main shaft 41 to rotate. Simultaneously, the blades 20 on the main shaft 41 rotate. The first pulley 43 drives the second pulley 53 to rotate via the transmission belt 60, thereby rotating the first transmission shaft 51 and the first spur gear 54. The first spur gear 54 meshes with the second spur gear 55, ultimately causing the second transmission shaft 52 and its blades 20 to rotate in the opposite direction relative to the blades 20 on the main shaft 41. The two blades 20 are positioned one in front of the other relative to the operator, allowing the operator to swing the mechanism left and right in an arc-shaped trajectory for fan-shaped cutting. The cutting range is large. When encountering thicker branches, because the two blades 20 on the main shaft 41 and the second transmission shaft 52 rotate in opposite directions, the object to be cut can be placed between the two blades 20 for cutting, resulting in stronger cutting force and better effect.

[0029] In another embodiment, the first pulley 43 and the second pulley 53 are preferably synchronous pulleys.

[0030] Synchronous belt drives are less prone to slippage and have higher transmission accuracy.

[0031] In another embodiment, such as Figure 1 As shown, the transmission housing 32 and the secondary housing 33 are extensions of the main housing 31 and lack stable support. Therefore, a support column 12 is provided between the secondary housing 33 and the operating rod 10.

[0032] The support column 12 provides support for the sub-shell 33, reducing the load on the sub-shell 33 and the transmission shell 32, and improving structural stability.

[0033] In another embodiment, such as Figure 1 As shown, the top of the transmission housing 32 is provided with a threaded post 80, and an internal threaded cover 81 is threadedly connected to the threaded post 80. The internal threaded cover 81 is adapted to the external thread of the main shaft 41 and the second transmission shaft 52.

[0034] The blade 20 can be disassembled and installed individually depending on the usage. When the cutting environment is simple, one of the blades 20 can be removed for use. After the blade 20 is removed, the spindle 41 or the second drive shaft 52 with the blade 20 removed can be covered and protected by the internal threaded cover 81.

[0035] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A double-blade reversible cutting mechanism for a brush cutter, comprising an operating lever, a working head, and blades, characterized in that, The working head includes: The outer casing includes a main casing, a transmission casing, and a secondary casing. A connecting casing for connecting an operating rod is provided on one side of the top of the main casing. The secondary casing is connected to one side of the bottom of the main casing through the transmission casing. A transmission assembly includes a main transmission component and a driven component. The main transmission component includes a main shaft, a first bevel gear, a first pulley, a second bevel gear, and a power shaft. The main shaft is vertically disposed within a main housing. The first bevel gear is located at the top of the main shaft, and the first pulley is located at the bottom of the main shaft. The power shaft is located within an operating lever and extends to the main housing at its end. The second bevel gear is located at the end of the power shaft, and the first bevel gear meshes with the second bevel gear. The driven component includes a first transmission shaft, a second transmission shaft, a second pulley, a first spur gear, and a second spur gear. The first transmission shaft is vertically disposed within a transmission housing. The second pulley and the first spur gear are respectively disposed on the first transmission shaft, and a transmission belt is provided between the first pulley and the second pulley. The second transmission shaft is vertically disposed within a secondary housing, and the second spur gear is disposed on the second transmission shaft and meshes with the first spur gear. The bottom end of the main shaft extends to the outer side of the bottom of the main housing, and the bottom end of the second transmission shaft extends to the outer side of the bottom of the secondary housing. The blade comprises two pieces, which are respectively mounted on the bottom end of the main shaft and the bottom end of the second drive shaft via a mounting structure.

2. The double-blade reversible cutting mechanism of the brush cutter according to claim 1, characterized in that, The mounting structure includes an upper pad, a lower pad, and a fastening nut. The upper pad is fixedly sleeved on the main shaft and the second drive shaft, respectively. The blade is located at the bottom of the upper pad, and the lower pad is located at the bottom of the blade. The bottom end of the main shaft and the bottom end of the second drive shaft are respectively provided with external threads that match the fastening nut. The fastening nut is set close to the bottom of the lower pad through a threaded connection.

3. The double-blade reversible cutting mechanism of the brush cutter according to claim 1, characterized in that, The first pulley and the second pulley are synchronous pulleys.

4. The double-blade reversible cutting mechanism of the brush cutter according to claim 1, characterized in that, A support column is provided between the sub-shell and the operating rod.

5. The double-blade reversible cutting mechanism of the brush cutter according to claim 2, characterized in that, The top of the transmission housing is provided with a threaded post, and an internal threaded cover is threadedly connected to the threaded post. The internal threaded cover is adapted to the external threads of the main shaft and the second transmission shaft.

6. The double-blade reversible cutting mechanism of the brush cutter according to claim 1, characterized in that, The secondary housing is located on the side of the main housing facing the operating lever, and the operating lever is provided with a grass-blocking plate covering the side of the blade on the second drive shaft.

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