Garden tool

Abstract

The utility model relates to a gardening tool. The gardening tool comprises a gearbox shell, a driving mechanism installed in the gearbox shell, a motor connected with the driving mechanism and a working assembly installed at one end of the driving mechanism. The driving mechanism comprises a first gear, a second gear meshed with the first gear and an output shaft connected with the second gear, the working assembly is installed at one end of the output shaft, and the first gear is connected with the motor; a lubricating cavity is formed in the gearbox shell, a transmission bearing is arranged on the output shaft, and the output shaft is connected with the gearbox shell through the transmission bearing. An oil sealing piece is further arranged on the output shaft, located on one side of the transmission bearing and used for sealing the space, close to one side of the lubricating cavity, of the transmission bearing. Through close fit of the oil seal part, the output shaft and the inner wall of the gearbox shell, leakage of lubricating grease in the lubricating cavity in the product operation process is effectively prevented, abrasion of the first gear and the second gear in the operation process is reduced, and the maintenance frequency and cost in the product use process are reduced.

Description

Technical Field

[0001] This application relates to the field of mechanical equipment, and in particular to a garden tool. Background Technology

[0002] In the transmission systems of garden tools such as lawnmowers, brush cutters, handheld trimmers, and branch saws, the drive gears (driven gears) in the gearbox are installed vertically downwards along their drive shaft. This causes the grease inside the gearbox to easily leak under gravity. When the gearbox assembly is running, the meshing friction of the gears generates heat, leading to an increase in internal temperature and pressure. The increased temperature causes the grease viscosity to decrease, and the grease changes from a semi-solid to a near-liquid state. The near-liquid grease will overflow from the bearing seal gaps, causing grease leakage. This, in turn, reduces the gear lubrication performance, affects the service life of the garden tools, and requires frequent grease replenishment during use, resulting in high maintenance costs.

[0003] Based on our understanding of the relevant technologies, the current method for solving the leakage problem is mainly to use metal or non-metal dust cover bearings to achieve relative sealing within the gearbox cavity. However, during the high-speed operation of the gearbox, the problem of internal grease overflow and leakage still occurs frequently, and the sealing effect is not ideal. Utility Model Content

[0004] The purpose of at least one specific embodiment of this utility model is to overcome the defects of the existing technology and provide a garden tool.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A garden tool, comprising:

[0007] Gearbox housing;

[0008] The drive mechanism is installed inside the gearbox housing;

[0009] The motor, which is connected to the drive mechanism;

[0010] Working components;

[0011] The drive mechanism includes a first gear, a second gear meshing with the first gear, an output shaft connected to the second gear, and a working component mounted on one end of the output shaft, which provides the driving force required for rotation.

[0012] The gearbox housing has a lubrication chamber filled with lubricating grease, and the second gear is located inside the lubrication chamber.

[0013] The output shaft is equipped with a transmission bearing, and the output shaft is connected to the gearbox housing through the transmission bearing;

[0014] An oil seal is also provided on the output shaft. The oil seal is located on one side of the transmission bearing and is used to seal the space on the side of the transmission bearing near the lubrication chamber.

[0015] Furthermore, the gearbox housing is provided with an oil filling port that communicates with the lubrication chamber. With the plane where the working component is located as the reference plane, the height of the oil filling port is greater than the installation height of the oil seal.

[0016] Furthermore, the oil seal includes a skeleton and an elastic sealing body covering the outside of the skeleton;

[0017] The elastic seal body includes an installation part and a sealing part. The installation part is sleeved on the outside of the output shaft, and the sealing part is located between the output shaft and the inner wall of the lubrication cavity. The outer wall of the sealing part is in contact with the inner wall of the gearbox housing.

[0018] Furthermore, the oil seal also includes a self-tightening elastic element, which is bound to the outside of the mounting portion and is adapted to apply radial compressive force to the mounting portion, so that the mounting portion grips the output shaft.

[0019] Furthermore, a first bearing is fitted onto the connecting shaft of the first gear, and a second bearing is fitted onto the output shaft. The second bearing is close to the second gear and is supported between the output shaft and the gearbox housing.

[0020] Furthermore, the outer diameter of the sealing part is larger than the inner diameter of the outer ring of the transmission bearing, and in its natural state, the inner diameter of the mounting part of the elastic seal body is smaller than the outer diameter of the output shaft.

[0021] Furthermore, the outer diameter of the sealing part is not less than the inner wall diameter of the gearbox housing.

[0022] Furthermore, both the first gear and the second gear are bevel gears, with the first gear connected to the motor.

[0023] Furthermore, the working components include a cutting flange, a cutting plate, and a cutting component. The cutting flange is keyed to the output shaft, the cutting component is mounted on the cutting flange, and the cutting plate is sleeved on the output shaft and located on one side of the cutting component.

[0024] Furthermore, the cutting components are toothed saw blades, toothed blades, or grass trimmers.

[0025] Furthermore, a dust cover is connected to the lower end of the output shaft.

[0026] Furthermore, the gearbox housing includes a first housing and a second housing, with the first gear and the first bearing located inside the first housing. The first housing is provided with a connecting lug and a screw hole seat. The connecting lug is adapted to connect the cutter guard, and the screw hole seat is adapted to lock the connecting rod connected to the first housing.

[0027] Furthermore, the lubrication cavity forms part of the internal cavity of the second housing.

[0028] The advantages of the garden tool provided in this application compared to the prior art are as follows: The gearbox housing of this application is provided with a lubrication cavity, which is filled with lubricating grease. An oil seal is also provided on the output shaft, which is located on one side of the transmission bearing. Through the tight fit between the oil seal and the shaft body of the output shaft and the inner wall of the gearbox housing, the sealing performance of the gearbox cavity is improved, effectively preventing the lubricating grease in the lubrication cavity from leaking from the gap of the transmission bearing during product operation. This reduces the wear of the first gear and the second gear during operation, extends the service life of the product, and reduces the maintenance frequency and cost during product use. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a garden tool in one embodiment of this application.

[0031] Figure 2 This is a top view of a garden tool in one embodiment of this application.

[0032] Figure 3 for Figure 2 A schematic diagram of the cross section along line AA.

[0033] Figure 4 for Figure 2 A schematic diagram of the cross section along line BB.

[0034] Figure 5 This is a partial structural diagram of a garden tool in one embodiment of this application.

[0035] Figure 6 This is a schematic diagram of the structure of an oil seal in one embodiment of this application.

[0036] Figure 7 This is a schematic diagram of the structure of the cutting flange in one embodiment of this application. Detailed Implementation

[0037] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0038] Reference Figure 1 , Figure 2 , Figure 5 A garden tool 100 includes a gearbox housing 10, a drive mechanism 20 installed inside the gearbox housing 10, a motor connected to the drive mechanism 20, and a working component 30 installed at one end of the drive mechanism 20.

[0039] The drive mechanism 20 includes a first gear 201, a second gear 202 meshing with the first gear 201, an output shaft 203 connected to the second gear 202, and a working component 30 installed at one end of the output shaft 203, which provides the driving force required for rotation. The first gear 201 and the second gear 202 are both bevel gears, and the first gear 201 is connected to a motor.

[0040] In this embodiment, refer to Figure 3 , Figure 4 , Figure 6 The gearbox housing 10 has a lubrication chamber 50 filled with lubricating grease. The second gear 202 is located inside the lubrication chamber 50, and the working component 30 is located outside the lubrication chamber 50. The output shaft 203 is provided with a transmission bearing 206, and the output shaft 203 is connected to the gearbox housing 10 through the transmission bearing 206.

[0041] The output shaft 203 is also provided with an oil seal 40, which is located on one side of the transmission bearing 206 and is used to seal the space of the transmission bearing 206 near the lubrication cavity 50. Through the tight fit between the oil seal 40 and the shaft body of the output shaft 203 and the inner wall of the gearbox housing 10, the sealing performance of the gearbox cavity is improved, and the lubricating grease in the lubrication cavity 50 is effectively prevented from leaking from the gap of the transmission bearing 206 during product operation.

[0042] Furthermore, the gearbox housing 10 is provided with an oil inlet 10a that communicates with the lubrication chamber. Taking the plane where the working component 30 is located as the reference plane, the height of the oil inlet 10a is greater than the installation height of the oil seal 40. Lubricating grease can be injected into the lubrication chamber 50 through the oil inlet 10a. The lubricating grease can wet the second gear 202. When the second gear 202 and the first gear 201 rotate relative to each other, the meshing position of the two can be lubricated and cooled. In addition, a plug 10b is provided at the oil inlet 10a. When the oil inlet 10a is idle, the plug 10b can seal the oil inlet 10a.

[0043] Furthermore, the oil seal 40 includes a skeleton 401 and an elastic sealing body covering the outside of the skeleton 401. The elastic sealing body is preferably made of rubber. The elastic sealing body includes a mounting part 402 and a sealing part 403. The mounting part 402 is sleeved on the outside of the output shaft 203, and the sealing part 403 is located between the output shaft 203 and the inner wall of the lubrication cavity 50. The outer wall of the sealing part 403 is in contact with the inner wall of the gearbox housing 10.

[0044] The oil seal 40 also includes a self-tightening elastic element 404, which is preferably a self-tightening spring. The self-tightening elastic element 404 is bound to the outside of the mounting portion 402 and is adapted to apply radial compressive force to the mounting portion 402 so that the mounting portion 402 hugs the output shaft 203.

[0045] Furthermore, a first bearing 204 is sleeved on the connecting shaft of the first gear 201, and a second bearing 205 is sleeved on the output shaft 203. The second bearing 205 is close to the second gear 202, and the transmission bearing 206 is close to the working component 30 and located at the bottom of the oil seal 40. The oil seal 40 is located above the transmission bearing 206 to seal the space above the transmission bearing 206 and prevent the lubricating grease in the lubrication cavity 50 from leaking from the gap of the transmission bearing 206.

[0046] Furthermore, the outer diameter of the sealing part 403 is larger than the inner diameter of the outer ring of the transmission bearing 206. In its natural state, the inner diameter of the mounting part 402 of the elastic seal body is smaller than the outer diameter of the output shaft 203. After the mounting part 402 is assembled with the output shaft 203, there is a certain interference fit. During installation, the inner wall of the mounting part 402 is coated with grease and then fitted onto the output shaft 203. The mounting part 402 fits tightly against the shaft body of the output shaft 203. After installation, the self-tightening elastic element 404 generates radial extrusion force on the mounting part 402 of the oil seal 40, ensuring the firmness of the fit between the mounting part 402 and the output shaft 203.

[0047] In addition, the outer diameter of the sealing part 403 is not less than the inner wall diameter of the gearbox housing 10. After the oil seal 40 is installed, its sealing part 403 fits tightly against the inner wall of the gearbox housing 10.

[0048] In this embodiment, the output shaft 203 is a splined shaft, that is, the shaft body is provided with a connecting key, which can be connected to various components such as bearings, gears, cutting flanges, etc.

[0049] Furthermore, the working component 30 includes a cutting flange 301, a cutting pressure plate 302, and a cutting component (not shown). The cutting flange 301 is keyed to the output shaft 203, the cutting component is mounted on the cutting flange 301, and the cutting pressure plate 302 is sleeved on the output shaft 203 and located on one side of the cutting component. In some embodiments, the cutting component can be a toothed saw blade, a toothed blade, or a grass trimmer.

[0050] The outer periphery of the cutting flange 301 is provided with an upward flange 301a. The flange 301a wraps around the lower end face of the gearbox housing 10, which can prevent debris from entering the gearbox housing 10 during operation and damaging the output shaft 203, and at the same time prevent the gearbox from getting tangled with grass.

[0051] Additionally, refer to Figure 7 The cutting flange 301 has a first fixing hole 301b, and the gearbox housing 10 has a corresponding second fixing hole 10c. There is at least one first fixing hole 301b, primarily used for disassembling the cutting component. Previously, during disassembly, if only the working component 30 was rotated, the output shaft 203 would rotate along with the working component, making it impossible to disassemble. Therefore, this application provides a first fixing hole 301b and a second fixing hole 10c. A disassembly tool, such as a pin, is simultaneously passed through both the first fixing hole 301b and the second fixing hole 10c, thereby fixing the gearbox housing 10 to the cutting flange 301. Since the cutting flange 301 and the output shaft 203 are keyed, the output shaft 203 and the gearbox housing 10 can be further fixed, preventing the output shaft from rotating during disassembly and facilitating the disassembly and replacement of the cutting component.

[0052] Furthermore, a dust cover 60 is connected to the lower end of the output shaft 203. The dust cover 60 is connected to the output shaft 203 by a nut 60a. The dust cover 60 and the nut 60a are riveted together, making it less likely to be lost.

[0053] Furthermore, the gearbox housing 10 includes a first housing 101 and a second housing 102. The lubrication cavity 50 forms part of the internal cavity of the second housing 102. The first gear 101 and the first bearing 204 are located inside the first housing 101. The first housing 101 is provided with a connecting lug 103 and a screw hole seat 104. The connecting lug 103 is suitable for connecting the cutter guard. In this embodiment, there are two screw hole seats 104. When the product is in use, the first housing 101 is connected to the connecting rod of the lawnmower. The first housing 101 is sleeved on the outer periphery of the connecting rod. The screw hole seats 104 are provided with screw holes. The mounting bolts lock the two screw hole seats 104, thereby locking the connection between the first housing 101 and the connecting rod.

[0054] In summary, the gearbox housing 10 of this application has a lubrication cavity 50 filled with lubricating grease. The output shaft 203 is also provided with an oil seal 40, which is located on one side of the transmission bearing 206. Through the tight fit between the oil seal 40 and the shaft of the output shaft 203 and the inner wall of the gearbox housing 10, the sealing performance of the gearbox cavity is improved, effectively preventing the lubricating grease in the lubrication cavity 50 from leaking from the gap of the transmission bearing 206 during product operation. This reduces the wear of the first gear 201 and the second gear 202 during operation, extends the product's service life, and reduces the maintenance frequency and cost during product use.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A garden tool, comprising: Gearbox housing; The drive mechanism is installed inside the gearbox housing; A motor, which is connected to the drive mechanism; Working components; The drive mechanism includes a first gear, a second gear meshing with the first gear, and an output shaft connected to the second gear. The working component is mounted on one end of the output shaft and is provided with the driving force required for rotation by the output shaft. The gearbox housing is characterized by having a lubrication chamber filled with lubricating grease, and the second gear being located inside the lubrication chamber. The output shaft is provided with a transmission bearing, and the output shaft is connected to the gearbox housing through the transmission bearing; The output shaft is also provided with an oil seal, which is located on one side of the transmission bearing and is used to seal the space of the transmission bearing near the lubrication cavity.

2. The garden tool according to claim 1, characterized in that, The gearbox housing is provided with an oil inlet that communicates with the lubrication cavity. Taking the plane where the working component is located as the reference plane, the height of the oil inlet is greater than the installation height of the oil seal.

3. The garden tool according to claim 1, characterized in that, The oil seal includes a skeleton and an elastic sealing body covering the outside of the skeleton; The elastic sealing body includes an installation part and a sealing part. The installation part is sleeved on the outside of the output shaft, and the sealing part is located between the output shaft and the inner wall of the lubrication cavity. The outer wall of the sealing part is in contact with the inner wall of the gearbox housing.

4. The garden tool according to claim 3, characterized in that, The oil seal also includes a self-tightening elastic element, which is bound to the outside of the mounting portion and adapted to apply radial compressive force to the mounting portion, so that the mounting portion grips the output shaft.

5. The garden tool according to claim 3, characterized in that, A first bearing is fitted on the connecting shaft of the first gear, and a second bearing is fitted on the output shaft. The second bearing is close to the second gear and is supported between the output shaft and the gearbox housing.

6. The garden tool according to claim 5, characterized in that, The outer diameter of the sealing part is larger than the inner diameter of the outer ring of the transmission bearing, and the inner diameter of the mounting part of the elastic sealing body is smaller than the outer diameter of the output shaft in its natural state.

7. The garden tool according to claim 5, characterized in that, The outer diameter of the sealing part is not less than the inner wall diameter of the gearbox housing.

8. The garden tool according to claim 1, characterized in that, Both the first gear and the second gear are bevel gears, and the first gear is connected to the motor.

9. The garden tool according to claim 1, characterized in that, The working assembly includes a cutting flange, a cutting plate, and a cutting component. The cutting flange is keyed to the output shaft, the cutting component is mounted on the cutting flange, and the cutting plate is sleeved on the output shaft and located on one side of the cutting component.

10. The garden tool according to claim 9, characterized in that, The cutting component is a toothed saw blade, a toothed blade, or a grass trimmer.

11. The garden tool according to claim 1, characterized in that, A dust cover is connected to the lower end of the output shaft.

12. The garden tool according to claim 5, characterized in that, The gearbox housing includes a first housing and a second housing. The first gear and the first bearing are located inside the first housing. The first housing is provided with a connecting lug and a screw hole seat. The connecting lug is adapted to connect to the cutter guard, and the screw hole seat is adapted to lock the connecting rod connected to the first housing.

13. The garden tool according to claim 12, characterized in that, The lubrication cavity forms part of the internal cavity of the second housing.

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