Brush cutter with middle motor

Abstract

The utility model relates to the technical field of garden equipment, and discloses a brush cutter with a middle motor. Comprising a handheld base, a first connecting pipe arranged on the rear side of the handheld base, a power supply unit arranged at the end, away from the handheld base, of the first connecting pipe, a second connecting pipe arranged on the front side of the handheld base, and a tool bit arranged at the end, away from the handheld base, of the second connecting pipe. A motor used for driving the tool bit to operate after being powered on is arranged in the machine shell, a transmission shaft with one end connected with an output shaft of the motor and the other end extending to the position of the tool bit is arranged in the second connecting pipe, and a transmission assembly used for driving the tool bit to rotate is arranged between the transmission shaft and the tool bit. Compared with a motor front-arranged mode, the weight of the tool bit can be reduced through the middle-arranged motor, and therefore an operator can better control the tool bit to mow; and compared with the rear motor, the transmission shaft required by the middle motor is shorter, so that the transmission efficiency can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of garden equipment technology, and specifically relates to a centrally mounted motor type brush cutter. Background Technology

[0002] A brush cutter is a machine used for mowing grass and branches, primarily for landscaping maintenance, clearing shrubs from forests, or tending large green belts along roadsides. It is characterized by its small size, light weight, and ease of operation, making it suitable for various environments such as home gardens, fields, and mountains.

[0003] Currently, Chinese Patent No. CN222193152U, published on December 20, 2024, discloses a lawn mower or brush cutter, comprising an output device housing unit, particularly a motor housing unit, and a protection unit. The protection unit includes a wire bow, which can swing from a stopped position to a used position. The output device housing unit or motor housing unit has a locking recess in the area of ​​the split joint of the output device housing or motor housing for locking the wire bow in the used position, and / or the output device housing unit or motor housing unit has a swing stop unit for the wire bow that protrudes radially relative to the output shaft or motor axis. The swing stop unit includes two swing stop elements, and the swing stop unit is constructed as an angular or L-shaped swing guide element and / or a swing stop element, preferably a swing guide surface and / or a swing stop surface.

[0004] The motor of this type of lawn mower or brush cutter is front-mounted, meaning the motor is located at the cutter head. However, this front-mounted motor design results in a large weight at the cutter head, which in turn gives the cutter head a lot of kinetic energy when it is running, making it difficult for the operator to control. In order to reduce the weight of the cutter head, it is often necessary to choose a lighter and smaller motor, which limits the power of the motor.

[0005] Meanwhile, Chinese patent CN209473035U, published on October 11, 2019, discloses a backpack lawnmower, including a blade head and a blade head drive mechanism. The blade head drive mechanism comprises a motor, a first drive shaft, a second drive shaft, a first sleeve, and a second sleeve. The right end of the first sleeve is fixedly connected to the motor, and a gearbox is fixedly mounted on the left end of the second sleeve. The right end of the first drive shaft is coaxially fixedly connected to the output shaft of the motor. A universal telescopic mechanism is provided between the right end of the second drive shaft and the left end of the first drive shaft. A locking mechanism is provided between the left end of the first sleeve and the right end of the second sleeve. A first bevel gear is coaxially fixedly mounted on the left end of the second drive shaft. A rotatable drive shaft is housed within the gearbox, and a second bevel gear is coaxially fixedly mounted on the drive shaft, meshing with the first bevel gear. The drive shaft extends out of the gearbox and is fixedly connected to the blade head.

[0006] The motor of this type of backpack lawnmower is rear-mounted, meaning the motor is located at the end furthest from the blade. However, this rear-mounted motor requires a relatively long drive shaft, resulting in high power consumption and low transmission efficiency. Utility Model Content

[0007] The purpose of this invention is to provide a mid-mounted motor brush cutter that can ensure the blade has a small weight while also ensuring the motor has high transmission efficiency.

[0008] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a mid-mounted motor brush cutter, including a handheld base, a first connecting pipe disposed on the rear side of the handheld base, a power supply unit disposed at the end of the first connecting pipe away from the handheld base, a second connecting pipe disposed on the front side of the handheld base, and a blade head disposed at the end of the second connecting pipe away from the handheld base. A housing is disposed at the position of the handheld base, and a motor for driving the blade head to rotate after being powered on is disposed inside the housing. The housing includes a first housing located on one side of the motor and a second housing located on the other side of the motor. A transmission shaft is disposed inside the second connecting pipe, with one end connected to the output shaft of the motor and the other end extending to the position of the blade head. A transmission component for driving the blade head to rotate is disposed between the transmission shaft and the blade head.

[0009] A further feature of this invention is that: the end of the first connecting tube is provided with a first connecting end that passes through the handheld base and enters the housing; both the first housing and the second housing are provided with a first through groove for the first connecting end to be embedded in; the end of the second connecting tube is provided with a second connecting end that enters the housing; both the first housing and the second housing are provided with a second through groove for the second connecting end to be embedded in.

[0010] The present invention is further configured such that: a first through hole is provided at both ends of the first housing and at the position near the motor; a first internal threaded sleeve corresponding to the position of the first through hole is provided at both ends of the second housing and at the position near the motor; a first bolt is provided between the first housing and the second housing, passing through the first through hole and threadedly connected to the first internal threaded sleeve; a connecting hole is provided on the first connecting end; a second internal threaded sleeve is provided on the second housing, passing through the connecting hole; a positioning hole corresponding to the position of the connecting hole is provided on the first housing; and a second bolt is provided between the first housing and the second housing, passing through the positioning hole and the connecting hole and threadedly connected to the second internal threaded sleeve.

[0011] A further feature of this invention is that heat dissipation holes are provided on both the first and second housings at the position of the motor.

[0012] A further feature of this invention is that the transmission assembly includes a first bevel gear located at the end of the transmission shaft away from the motor, a cutter shaft connected to the cutter head, and a second bevel gear located at the upper end of the cutter shaft and meshing with the first bevel gear.

[0013] A further feature of this invention is that the handheld base includes a base plate, a handheld rod located on the upper side of the base plate, and a connecting plate located on the lower side of the base plate and wrapped around a first connecting tube. A fixing sleeve is provided on the first connecting tube near the base plate, and the fixing sleeve is provided with a hanging hole for connecting a shoulder strap.

[0014] A further feature of this invention is that: an elastic buckle plate for fixing a hand handle is provided on the upper side of the base plate; a sleeve covering the upper side of the hand handle is provided on one side of the elastic buckle plate; an installation hole is provided in the middle of the elastic buckle plate; a threaded hole corresponding to the position of the installation hole is provided on the base plate; a threaded shaft passing through the installation hole and threadedly connected to the threaded hole is provided on the base plate; a knob is provided at the upper end of the threaded shaft; a buckle hole is provided on the side of the sleeve away from the elastic buckle plate; and a clip for embedding in the buckle hole is provided on the base plate.

[0015] In summary, this utility model has the following beneficial effects:

[0016] 1. The motor is mounted inside the handle housing, positioned close to the center of the brush cutter. The motor drives the blades via a drive shaft and transmission components within the second connecting pipe. Compared to a front-mounted motor, a mid-mounted motor reduces the weight of the blades, allowing for better operator control. Furthermore, compared to a rear-mounted motor, a mid-mounted motor requires a shorter drive shaft, improving transmission efficiency. Ultimately, this design achieves both a lighter blade and higher motor transmission efficiency.

[0017] 2. The housing is wrapped around both sides of the motor by the first housing and the second housing. The first connecting pipe is inserted into the first through groove inside the housing by the first connecting end, and the second connecting pipe is inserted into the second through groove inside the housing by the second connecting end. This facilitates a stable connection between the housing and the first and second connecting pipes.

[0018] 3. The first housing and the second housing are connected by a first bolt through the first through hole and threaded into the first internal threaded sleeve, thereby achieving a stable connection between the first housing and the second housing; at the same time, the second bolt is connected by a second bolt through the positioning hole and the connecting hole and threaded into the second internal threaded sleeve, and the second internal threaded sleeve is inserted into the connecting hole, thereby positioning the housing at the first connecting end, which is beneficial to the stable connection of the housing at the first connecting end.

[0019] 4. By utilizing the heat dissipation holes on both the first and second housings located at the motor position, the heat dissipation holes can facilitate heat dissipation during motor operation and improve the motor's operating efficiency.

[0020] 5. After the output shaft of the motor drives the transmission shaft to rotate, the transmission shaft can drive the cutter shaft to rotate by meshing the first bevel gear and the second bevel gear, and then drive the cutter head to rotate through the cutter shaft;

[0021] 6. The handheld base is connected to the first connecting tube via a connecting plate and a base plate. The first connecting tube is connected to the shoulder strap via a fixing sleeve and a hanging hole, allowing the operator to carry the brush cutter on their back. This makes it easier for the operator to operate the brush cutter with less effort. Since the shoulder strap is close to the motor, the weight generated by the motor can be directly applied to the operator through the shoulder strap, avoiding the problem of the motor forming an excessively long lever arm due to the long distance between it and the operator, which would affect the operator's stable control of the brush cutter.

[0022] 7. When it is necessary to install the hand handle on the base plate, use the sleeve of the elastic buckle to wrap around the upper side of the hand handle, then use the threaded shaft to pass through the mounting hole and thread it into the threaded hole. The threaded shaft and the knob will then drive the sleeve to press tightly onto the hand handle. Finally, use the buckle hole on the side of the sleeve to insert the clip on the base plate, thereby realizing the elastic buckle to fix the hand handle to the base plate stably and conveniently. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a partial exploded view of the structure located at the casing position in this utility model;

[0026] Figure 3 This is a partial exploded view of the structure located at the handheld base position in this utility model;

[0027] Figure 4 This is a partial structural cross-sectional view of the cutter head position in this utility model.

[0028] In the diagram, 1. Handheld base; 11. Base plate; 111. Threaded hole; 112. Threaded shaft; 113. Knob; 114. Chuck; 12. Handheld lever; 13. Connecting plate; 2. First connecting pipe; 21. Power supply unit; 22. First connecting end; 221. Connecting hole; 23. Fixing sleeve; 231. Hanging hole; 3. Second connecting pipe; 31. Drive shaft; 32. Second connecting end; 4. Cutter head; 5. Housing; 51. First housing; 51 1. First through hole; 512. Positioning hole; 52. Second housing; 521. First internal threaded sleeve; 522. Second internal threaded sleeve; 501. First through groove; 502. Second through groove; 503. First bolt; 504. Second bolt; 505. Heat dissipation hole; 6. Motor; 7. Transmission assembly; 71. First bevel gear; 72. Cutting shaft; 73. Second bevel gear; 8. Elastic buckle plate; 81. Sheath; 82. Mounting hole; 83. Buckle hole. Detailed Implementation

[0029] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. 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 of this utility model.

[0030] A mid-mounted motor brush cutter, as shown in the reference Figure 1 This type of mid-mounted motor brush cutter includes a handheld base 1, a first connecting pipe 2, a power supply unit 21, a second connecting pipe 3, and a cutter head 4. The first connecting pipe 2 is located on the rear side of the handheld base 1, while the power supply unit 21 is located at the end of the first connecting pipe 2 away from the handheld base 1. The power supply unit 21 is mainly a battery pack. Meanwhile, the second connecting pipe 3 is located on the front side of the handheld base 1, and the cutter head 4 is bolted to the end of the second connecting pipe 3 away from the handheld base 1.

[0031] Reference Figure 1 , Figure 2 , Figure 3The handheld stand 1 includes a seat plate 11, a handheld bar 12 located on the upper side of the seat plate 11, and a connecting plate 13 detachably connected to the lower side of the seat plate 11 by bolts and wrapped around a first connecting tube 2. A fixing sleeve 23 is fixed to the first connecting tube 2 near the seat plate 11 by bolts, and the fixing sleeve 23 has a hanging hole 231 for connecting a shoulder strap. At the same time, an elastic buckle plate 8 for fixing the handheld bar 12 is provided on the upper side of the seat plate 11. This elastic buckle plate 8 is made of elastic plastic material, and one side of the elastic buckle plate 8 is integrally formed with... A sleeve 81 is provided to cover the upper side of the handle 12. The elastic buckle plate 8 has a mounting hole 82 in the middle, and the base plate 11 has a threaded hole 111 corresponding to the mounting hole 82. The base plate 11 is provided with a threaded shaft 112 that passes through the mounting hole 82 and is threaded into the threaded hole 111. A knob 113 is welded to the upper end of the threaded shaft 112. The sleeve 81 also has two buckle holes 83 on the side away from the elastic buckle plate 8, and the base plate 11 is integrally provided with a clip 114 for embedding in the buckle holes 83.

[0032] Reference Figure 1 , Figure 2 , Figure 4 A housing 5 is provided at the position of the handheld base 1. A motor 6 for driving the cutter head 4 to rotate after being connected to electricity is installed in the housing 5 by bolts. A transmission shaft 31 is also rotatably connected to the second connecting pipe 3 by bearings. One end of the transmission shaft 31 is connected to the output shaft of the motor 6 by a coupling, and the other end extends to the position of the cutter head 4. At the same time, a transmission assembly 7 for driving the cutter head 4 to rotate is provided between the transmission shaft 31 and the cutter head 4. The transmission assembly 7 includes a first bevel gear 71 fixed at the end of the transmission shaft 31 away from the motor 6, a cutter shaft 72 fixedly connected to the cutter head 4, and a second bevel gear 73 fixed at the upper end of the cutter shaft 72 and meshing with the first bevel gear 71.

[0033] Reference Figure 1 , Figure 2 , Figure 3The housing 5 includes a first housing 51 located on one side of the motor 6 and a second housing 52 located on the other side of the motor 6. Both the first housing 51 and the second housing 52 have heat dissipation holes 505 at the positions corresponding to the motor 6. The end of the first connecting pipe 2 is integrally provided with a first connecting end 22 that passes through the handheld base 1 and enters the housing 5. Both the first housing 51 and the second housing 52 have first through slots 501 for the first connecting end 22 to be inserted. Similarly, the end of the second connecting pipe 3 is integrally provided with a second connecting end 32 that enters the housing 5. Both the first housing 51 and the second housing 52 have second through slots 502 for the second connecting end 32 to be inserted. The first housing 51 has first through holes at both ends and near the motor 6. 511, and the two ends of the second housing 52 and the position near the motor 6 are all integrally provided with a first internal threaded sleeve 521 corresponding to the position of the first through hole 511. At the same time, a first bolt 503 is provided between the first housing 51 and the second housing 52, which passes through the first through hole 511 and is threaded into the first internal threaded sleeve 521. The first connecting end 22 is also provided with a connecting hole 221, and the second housing 52 is integrally provided with a second internal threaded sleeve 522 that passes through the connecting hole 221. At the same time, the first housing 51 is provided with a positioning hole 512 corresponding to the position of the connecting hole 221, and a second bolt 504 is provided between the first housing 51 and the second housing 52, which passes through the positioning hole 512 and the connecting hole 221 and is threaded into the second internal threaded sleeve 522.

[0034] Principle: The motor 6 is installed inside the housing 5 located at the handheld base 1, allowing it to be positioned close to the center of the brush cutter. Simultaneously, the motor 6 drives the blade head 4 to rotate via the drive shaft 31 and transmission assembly 7 within the second connecting pipe 3. Compared to a front-mounted motor 6, a centrally located motor 6 reduces the weight of the blade head 4, allowing the operator to better control it for cutting grass. Furthermore, compared to a rear-mounted motor 6, the drive shaft 31 required for a centrally located motor 6 is shorter, thus improving transmission efficiency. Ultimately, this achieves both a lighter blade head 4 and high transmission efficiency for the motor 6.

Claims

1. A mid-mounted motor type brush cutter, comprising a handheld base (1), a first connecting pipe (2) disposed on the rear side of the handheld base (1), a power supply unit (21) disposed at the end of the first connecting pipe (2) away from the handheld base (1), a second connecting pipe (3) disposed on the front side of the handheld base (1), and a cutter head (4) disposed at the end of the second connecting pipe (3) away from the handheld base (1), characterized in that: A housing (5) is provided at the position of the handheld base (1). A motor (6) is provided inside the housing (5) for driving the cutter head (4) to rotate after being powered on. The housing (5) includes a first housing (51) located on one side of the motor (6) and a second housing (52) located on the other side of the motor (6). A transmission shaft (31) with one end connected to the output shaft of the motor (6) and the other end extending to the position of the cutter head (4) is provided inside the second connecting pipe (3). A transmission assembly (7) for driving the cutter head (4) to rotate is provided between the transmission shaft (31) and the cutter head (4).

2. A mid-mounted motor brush cutter according to claim 1, characterized in that: The end of the first connecting tube (2) is provided with a first connecting end (22) that passes through the handheld base (1) and enters the housing (5). The first housing (51) and the second housing (52) are both provided with a first through groove (501) for the first connecting end (22) to be embedded. The end of the second connecting tube (3) is provided with a second connecting end (32) that enters the housing (5). The first housing (51) and the second housing (52) are both provided with a second through groove (502) for the second connecting end (32) to be embedded.

3. A mid-mounted motor brush cutter according to claim 2, characterized in that: The first housing (51) has a first through hole (511) at both ends and near the motor (6). The second housing (52) has a first internal thread sleeve (521) at both ends and near the motor (6) corresponding to the first through hole (511). A first bolt (503) is provided between the first housing (51) and the second housing (52) and passes through the first through hole (511) and is threaded into the first internal thread sleeve (521). A connecting hole (221) is provided on the first connecting end (22). A second internal thread sleeve (522) is provided on the second housing (52) and passes through the connecting hole (221). A positioning hole (512) is provided on the first housing (51) corresponding to the connecting hole (221). A second bolt (504) is provided between the first housing (51) and the second housing (52) and passes through the positioning hole (512) and the connecting hole (221) and is threaded into the second internal thread sleeve (522).

4. A mid-mounted motor brush cutter according to claim 2, characterized in that: Heat dissipation holes (505) are provided on the first housing (51) and the second housing (52) at the position of the motor (6).

5. A mid-mounted motor brush cutter according to claim 1, characterized in that: The transmission assembly (7) includes a first bevel gear (71) located at the end of the transmission shaft (31) away from the motor (6), a cutter shaft (72) connected to the cutter head (4), and a second bevel gear (73) located at the upper end of the cutter shaft (72) and meshing with the first bevel gear (71).

6. A mid-mounted motor brush cutter according to claim 1, characterized in that: The handheld stand (1) includes a seat plate (11), a handheld bar (12) located on the upper side of the seat plate (11), and a connecting plate (13) located on the lower side of the seat plate (11) and wrapped around the first connecting tube (2). A fixing sleeve (23) is provided on the first connecting tube (2) near the seat plate (11), and the fixing sleeve (23) is provided with a hanging hole (231) for connecting the shoulder strap.

7. A mid-mounted motor brush cutter according to claim 6, characterized in that: The upper side of the base plate (11) is provided with an elastic buckle plate (8) for fixing the hand handle (12). One side of the elastic buckle plate (8) is provided with a sleeve (81) that wraps around the upper side of the hand handle (12). The elastic buckle plate (8) has an installation hole (82) in the middle. The base plate (11) has a threaded hole (111) corresponding to the position of the installation hole (82). The base plate (11) is provided with a threaded shaft (112) that passes through the installation hole (82) and is threaded into the threaded hole (111). The upper end of the threaded shaft (112) is provided with a knob (113). The side of the sleeve (81) away from the elastic buckle plate (8) has a buckle hole (83). The base plate (11) is provided with a clip (114) for embedding in the buckle hole (83).

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