A garden tool self-propelled device

Abstract

The utility model relates to a kind of self-propelled vehicle of garden tool, including shell, drive mechanism and transmission mechanism, transmission mechanism includes input shaft, input gear and output mechanism, output mechanism includes clutch mechanism and output shaft, output shaft is fixedly installed at the end of input shaft, clutch mechanism includes overrunning clutch, planetary gear and elastic fixing device, overrunning clutch is fixedly connected with input shaft, multiple ball bearings are arranged at equidistance interval on planetary gear, annular groove is provided on overrunning clutch, multiple recesses are arranged at equidistance interval on the bottom of annular groove, planetary gear drives ball bearing to carry out circumferential motion in annular groove, overrunning clutch is fixedly installed on input shaft, one end of elastic fixing device is fixed on input shaft, and the other end is abutting on the side of planetary gear away from overrunning clutch.This design makes that garden tool can also be normally pulled by user under unpowered state, so as to improve the convenience and work efficiency of garden work.

Description

Technical Field

[0001] This utility model relates to the field of garden tool technology, and in particular to a self-propelled garden tool. Background Technology

[0002] The demand for garden tools continues to grow in fields such as garden maintenance, landscape design, and agricultural planting. Traditional garden tools mainly rely on manual operation, such as push lawnmowers and handheld trimmers. Self-propelled garden tools are devices installed on garden tools that enable them to move autonomously. They are usually electrically driven and can move the garden tools when powered on, thereby reducing the workload of manual labor.

[0003] However, self-propelled vehicles that use electric motors as their power source generally face a problem: when the power is interrupted, the garden tools are difficult to pull normally due to the excessive torque of the motor, which causes a certain degree of inconvenience in actual operation. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a self-propelled device for garden tools, so that garden tools can be pulled normally by the user even when they are not powered on, thereby improving the convenience and efficiency of garden work.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A self-propelled garden tool includes a housing, a drive mechanism, and a transmission mechanism. Both the drive mechanism and the transmission mechanism are installed in the housing. The drive mechanism drives the transmission mechanism to move. The transmission mechanism includes an input shaft, an input gear, and an output mechanism. The input gear is fixedly installed in the middle of the input shaft. There are two sets of output mechanisms, symmetrically installed at both ends of the input gear. The output mechanism includes a clutch mechanism and an output shaft. The output shaft is fixedly installed at the end of the input shaft. The clutch mechanism includes an overrunning clutch, a planetary gear, and a flexible retaining device. The overrunning clutch is fixedly connected to the input shaft. One end of the planetary gear is sleeved on the overrunning clutch, and the other end extends to the connection between the output shaft and the input shaft and meshes with the output shaft. The planetary gear has multiple balls circumferentially spaced at equal intervals. The overrunning clutch has an annular groove, and the bottom of the annular groove has multiple recesses circumferentially spaced at equal intervals. The number of recesses is twice that of the balls. The planetary gear drives the balls to perform circular motion in the annular groove. The overrunning clutch is fixedly installed on the input shaft. One end of the flexible retaining device is fixed to the input shaft, and the other end abuts against the side of the planetary gear away from the overrunning clutch.

[0007] In this design, when the garden tool is powered on, the motor in the drive mechanism starts, and power is transmitted to the input shaft via the input gear. Since the overrunning clutch is mounted on the input shaft, rotation of the input shaft causes the overrunning clutch to lock, thereby driving the planetary gears. One end of the planetary gear extends to the connection between the output and input shafts and meshes with the output shaft, thus transmitting power to the output shaft and driving the wheels of the garden tool to rotate, enabling the device to move. When the garden tool is powered off, the torque of the motor in the drive mechanism is transmitted to the input shaft. At this time, the output mechanism must be unlocked from the input shaft so that the garden tool can move. Specifically, when the user drags the garden tool, the rotation of the wheels drives the output shaft to rotate. Since one end of the planetary gear extends to the connection between the output and input shafts and meshes with the output shaft, rotation of the output shaft drives the planetary gear to rotate, which in turn drives the ball bearings to move circumferentially in an annular groove. The bottom of the annular groove has a recess; when the ball bearings move into the recess, the overrunning clutch is locked; when the ball bearings leave the recess, the overrunning clutch is unlocked. Therefore, the planetary gears continuously drive the ball bearings, and the overrunning clutch alternates between locked and unlocked states, thus ensuring that the garden tools can move normally even when the power is off.

[0008] Furthermore, the planetary gear includes planetary gears, a sun gear assembly, a planet carrier, and an internal gear sleeve. There are multiple planetary gears, which are circumferentially equidistantly arranged on the planet carrier. The planet carrier and the sun gear assembly are fitted onto the overrunning clutch. The outer edge of the sun gear assembly meshes with the multiple planetary gears, and the multiple planetary gears mesh with the internal gear sleeve. The sun gear assembly includes a sun gear and a connecting part. The connecting part is fixedly arranged at the end of the sun gear away from the planet carrier, and multiple balls are circumferentially equidistantly arranged on the connecting part.

[0009] The overrunning clutch includes an outer ring, an inner ring, a cage, and multiple rollers. The cage is coaxially arranged with the input shaft. One end of the cage has multiple circumferentially spaced receiving grooves, and the rollers are installed in the receiving grooves. An annular groove is set on the cage and is coaxially arranged with the input shaft. The inner ring is fixedly connected to the input shaft and has a hexagonal structure. The inner ring, cage, and outer ring gear are installed on the input shaft from the inside out.

[0010] In this design, when the garden tool is powered on, the input shaft rotates, causing the inner ring to rotate accordingly. Because the inner ring is hexagonal, its rotation pushes a roller installed in a receiving groove outwards. When the apex of the inner ring contacts the roller, the roller contacts the inner wall of the outer ring gear. Under friction, the roller locks with the inner wall of the outer ring gear, thereby driving the planetary gears and transmitting power to the output shaft. In the de-energized state, power is transmitted through the output shaft, causing the inner ring gear of the planetary gears to rotate. The planetary gears mesh with the inner gear sleeves and the sun gear, transmitting power to the sun gear assembly, which in turn drives the balls located in the connecting part to move in the annular groove. As mentioned earlier, when the balls move in the annular groove, the overrunning clutch alternates between locked and unlocked states, thus unlocking the overrunning clutch and allowing the wheel to move freely.

[0011] Furthermore, the front section of the inner gear sleeve has a first meshing tooth, and the rear section has a second meshing tooth. The first meshing tooth meshes with the planetary gear. The rear end of the inner gear sleeve extends to the connection between the output shaft and the input shaft. The input shaft has gear teeth, and the second meshing tooth meshes with these gear teeth. This structure is a bipolar meshing structure, which optimizes the power transmission path and improves transmission efficiency. Simultaneously, the rear end of the inner gear sleeve extends to the connection between the input and output shafts, directly meshing with the input shaft gear teeth via the second meshing tooth. This eliminates the need for additional transmission components, and the connection between the input and output shafts is completed integrally through the inner gear sleeve, simplifying the assembly process.

[0012] Furthermore, the elastic retaining device includes a limiting spring and a limiting member. The limiting member is fixedly mounted on the input shaft, and the limiting spring is installed between the retaining member and the cage. The limiting device is designed to stabilize the position of the planetary gear and prevent it from shifting during rotation.

[0013] Furthermore, bearings are installed on both the input and output shafts. The outer ring of the bearing is fixedly connected to the housing, and the inner ring is fixedly connected to the input or output shaft. This design forms a fully supported structure, significantly reducing the risk of shaft bending deformation. Especially under high torque or lateral load conditions, such as when garden tool blades are cutting thick grass or encountering rocks, the shaft can still maintain linear rotation, avoiding gear misalignment or wear caused by wobbling.

[0014] In conclusion, the self-propelled mechanism of this garden tool allows the tool to be pulled by the user even when it is not powered on, thereby improving the convenience and efficiency of garden work. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0016] Figure 1 This is a cross-sectional view of the present invention;

[0017] Figure 2This is a schematic diagram of the drive mechanism and transmission mechanism of this utility model;

[0018] Figure 3 This is a cross-sectional view of the output mechanism of this utility model;

[0019] Figure 4 This is a schematic diagram of the overrunning clutch of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the retainer of this utility model;

[0021] Figure 6 This is a schematic diagram of the planetary gear of this utility model;

[0022] Figure 7 This is a schematic diagram of the internal toothed sleeve of this utility model;

[0023] The components include: housing-1, drive mechanism-2, transmission mechanism-3, input shaft-31, input gear-32, output mechanism-33, clutch mechanism-34, output shaft-35, overrunning clutch-36, annular groove-361, recess-3611, outer ring-362, inner ring-363, cage-364, roller-365, planetary gear-37, ball-bearing assembly-371, planetary gear-372, sun gear assembly-373, sun gear-3731, connecting part-3732, planetary carrier-374, internal gear sleeve-375, first meshing tooth-3751, second meshing tooth-3752, elastic fixing device-38, limit spring-381, limit member-382, and bearing-4. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] In the description of this utility model, it should be understood that the orientation and positional relationship indicated by terms such as "up", "down", "left", "right", "front", "back", "vertical", "bottom", "inner", and "outer" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] like Figures 1 to 7As shown, a self-propelled garden tool includes a housing 1, a drive mechanism 2, and a transmission mechanism 3. Both the drive mechanism 2 and the transmission mechanism are installed in the housing 1. The drive mechanism 2 drives the transmission mechanism 3. The transmission mechanism 3 includes an input shaft, an input gear 32, and an output mechanism 33. The input gear 32 is fixedly installed in the middle of the input shaft. There are two sets of output mechanisms 33, symmetrically installed at both ends of the input gear 32. The output mechanism 33 includes a clutch mechanism 34 and an output shaft 35. The output shaft 35 is fixedly installed at the end of the input shaft. The clutch mechanism 34 includes an overrunning clutch 36, a planetary gear 37, and a flexible fixing device 38. The overrunning clutch 36 is fixedly connected to the input shaft. One end of the planetary gear 37 is fitted onto the overrunning clutch 36, and the other end extends to the connection between the output shaft 35 and the input shaft and meshes with the output shaft 35. The planetary gear 37 is provided with a plurality of balls 371 at equal intervals in the circumferential direction. The overrunning clutch 36 is provided with an annular groove 361. The bottom of the annular groove 361 is provided with a plurality of recesses 3611 at equal intervals in the circumferential direction. The number of recesses 3611 is twice that of the balls 371. The planetary gear 37 drives the balls 371 to perform circular motion in the annular groove 361. The overrunning clutch 36 is fixedly installed on the input shaft. One end of the elastic fixing device 38 is fixed on the input shaft, and the other end is pressed against the side of the planetary gear 37 away from the overrunning clutch 36.

[0027] In this design, when the garden tool is powered on, the motor in drive mechanism 2 starts, and power is transmitted to the input shaft via input gear 32. Since overrunning clutch 36 is mounted on the input shaft, rotation of the input shaft causes overrunning clutch 36 to lock, thereby driving planetary gear 37. One end of planetary gear 37 extends to the connection point 3732 between output shaft 35 and input shaft, meshing with output shaft 35, thus transmitting power to output shaft 35 and driving the wheels of the garden tool to rotate, enabling the device to move. When the garden tool is powered off, the torque of the motor in drive mechanism 2 is transmitted to the input shaft. At this time, output mechanism 33 must be unlocked from the input shaft so that the garden tool can move. Specifically, when the user drags the garden tool, the rotation of the wheels drives output shaft 35 to rotate. Since one end of planetary gear 37 extends to the connection point 3732 between output shaft 35 and input shaft, meshing with output shaft 35, rotation of output shaft 35 drives planetary gear 37 to rotate, thereby driving ball bearing 371 to move circumferentially in annular groove 361. The bottom of the annular groove 361 has a recess 3611. When the ball 371 moves to the recess 3611, the overrunning clutch 36 is locked; when the ball 371 leaves the recess 3611, the overrunning clutch 36 is unlocked. Therefore, the planetary gear 37 continuously drives the ball 371 to move, and the overrunning clutch 36 alternates between the locked and unlocked states, thereby ensuring that the garden tool can move normally when the power is off.

[0028] Preferably, the planetary gear 37 includes planetary gears 372, a sun gear assembly 373, a planet carrier 374, and an internal gear sleeve 375. There are multiple planetary gears 372, which are circumferentially equidistantly arranged on the planet carrier 374. The planet carrier 374 and the sun gear assembly 373 are fitted onto the overrunning clutch 36. The outer edge of the sun gear assembly 373 is meshed with the multiple planetary gears 372. The multiple planetary gears 37 are meshed with the internal gear sleeve 375. The sun gear assembly 373 includes a sun gear 3731 and a connecting portion 3732. The connecting portion 3732 is fixedly arranged at the end of the sun gear 3731 away from the planet carrier 374. Multiple balls 371 are circumferentially equidistantly arranged on the connecting portion 3732.

[0029] The overrunning clutch 36 includes an outer ring 362, an inner ring 363, a cage 364, and multiple rollers 365. The cage 364 is coaxially arranged with the input shaft. One end of the cage 364 is provided with multiple receiving grooves at equal intervals around the circumference. The rollers 365 are installed in the receiving grooves. An annular groove 361 is provided on the cage 364 and is coaxially arranged with the input shaft. The inner ring 363 is fixedly connected to the input shaft and has a hexagonal structure. The gears of the inner ring 363, the cage 364, and the outer ring 362 are installed on the input shaft from the inside to the outside.

[0030] In this design, when the garden tool is powered on and the input shaft rotates, the inner ring 363 rotates accordingly. Since the inner ring 363 is hexagonal, its rotation pushes the roller 365, which is installed in the receiving groove, outward. When the apex of the inner ring 363 contacts the roller 365, the roller 365 contacts the inner wall of the outer ring 362 gear. Under the action of friction, the roller 365 locks with the inner wall of the outer ring 362 gear, thereby driving the planetary gear 37 and transmitting power to the output shaft 35. In the de-energized state, power is transmitted through the output shaft 35, the internal gear ring of the planetary gear 37 rotates, and the planetary gear 372 meshes with the internal gear sleeve 375 and the sun gear 3731, transmitting power to the sun gear assembly 373, which in turn drives the ball bearing 371, located in the connecting part 3732, to move in the annular groove 361. As mentioned above, when the ball 371 moves in the annular groove 361, the overrunning clutch 36 alternates between locked and unlocked states, thereby unlocking the overrunning clutch 36 and allowing the wheel to move freely.

[0031] Preferably, the inner gear sleeve 375 has a first meshing tooth 3751 inside its front section and a second meshing tooth 3752 inside its rear section. The first meshing tooth 3751 meshes with the planetary gear 372. The rear end of the inner gear sleeve 375 extends to the connection between the output shaft 35 and the input shaft. The input shaft has gear teeth (not shown in the figure), and the second meshing tooth 3752 meshes with these gear teeth. This structure is a bipolar meshing structure, which optimizes the power transmission path and improves transmission efficiency. Furthermore, the rear end of the inner gear sleeve 375 extends to the connection between the input shaft and the output shaft 35, directly meshing with the input shaft gear teeth via the second meshing tooth 3752. This eliminates the need for additional transmission components, and the connection between the input shaft and the output shaft 35 is completed integrally through the inner gear sleeve 375, simplifying the assembly process.

[0032] Preferably, the elastic retaining device 38 includes a limiting spring 381 and a limiting member 382, ​​with the limiting member 382 fixedly mounted on the input shaft and the limiting spring 381 mounted between the retainer and the cage 364. The limiting device is designed to stabilize the position of the planetary gear 37 and prevent it from shifting during rotation.

[0033] Preferably, bearings 4 are installed on both the input shaft and the output shaft 35. The outer ring 362 of the bearing 4 is fixedly connected to the housing, and the inner ring 363 is fixedly connected to the input shaft or the output shaft 35. This design forms a fully supported structure, which greatly reduces the risk of shaft bending deformation. Especially under high torque or lateral load conditions, such as when garden tool blades are cutting thick grass or encountering rocks, the shaft can still maintain linear rotation, avoiding gear misalignment or wear caused by wobbling.

[0034] In conclusion, the self-propelled mechanism of this garden tool allows the tool to be pulled by the user even when it is not powered on, thereby improving the convenience and efficiency of garden work.

[0035] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-propelled garden tool, comprising a housing, a drive mechanism, and a transmission mechanism, wherein the drive mechanism and the transmission mechanism are both installed in the housing, the drive mechanism drives the transmission mechanism to move, the transmission mechanism includes an input shaft, an input gear, and an output mechanism, the input gear is fixedly installed in the middle of the input shaft, and there are two sets of output mechanisms, the two sets of output mechanisms being symmetrically installed at both ends of the input gear, characterized in that: The output mechanism includes a clutch mechanism and an output shaft. The output shaft is fixedly installed at the end of the input shaft. The clutch mechanism includes an overrunning clutch, a planetary gear, and a flexible retaining device. The overrunning clutch is fixedly connected to the input shaft. One end of the planetary gear is sleeved on the overrunning clutch, and the other end extends to the connection between the output shaft and the input shaft and meshes with the output shaft. The planetary gear has multiple balls circumferentially spaced at equal intervals. The overrunning clutch has an annular groove, and the bottom of the annular groove has multiple recesses circumferentially spaced at equal intervals. The number of recesses is twice that of the balls. The planetary gear drives the balls to perform circular motion within the annular groove. The overrunning clutch is fixedly installed on the input shaft. One end of the flexible retaining device is fixed to the input shaft, and the other end abuts against the side of the planetary gear away from the overrunning clutch.

2. The self-propelled garden tool according to claim 1, characterized in that: The planetary gear includes planetary gears, a sun gear assembly, a planet carrier, and an internal gear sleeve. There are multiple planetary gears, which are circumferentially equidistantly arranged on the planet carrier. The planet carrier and the sun gear assembly are fitted onto an overrunning clutch. The outer edge of the sun gear assembly meshes with the multiple planetary gears, and the multiple planetary gears mesh with the internal gear sleeve. The sun gear assembly includes a sun gear and a connecting part. The connecting part is fixedly arranged at the end of the sun gear away from the planet carrier, and the multiple ball bearings are circumferentially equidistantly arranged on the connecting part.

3. The self-propelled garden tool according to claim 2, characterized in that: The overrunning clutch includes an outer ring, an inner ring, a cage, and multiple rollers. The cage is coaxially arranged with the input shaft. One end of the cage has multiple equidistant grooves circumferentially spaced, and the rollers are installed in the accommodating grooves. The annular groove is arranged on the cage and coaxially with the input shaft. The inner ring is fixedly connected to the input shaft and has a hexagonal structure. The inner ring, cage, and outer ring gear are sequentially installed on the input shaft from the inside out.

4. The self-propelled garden tool according to claim 3, characterized in that: The inner gear sleeve has a first meshing tooth inside the front section and a second meshing tooth inside the rear section. The first meshing tooth meshes with the planetary gear. The rear end of the inner gear sleeve extends to the connection between the output shaft and the input shaft. The input shaft has gear teeth, and the second meshing tooth meshes with the gear teeth.

5. The self-propelled garden tool according to claim 3, characterized in that: The elastic fixing device includes a limiting spring and a limiting member. The limiting member is fixedly installed on the input shaft, and the limiting spring is installed between the fixing member and the retainer.

6. The self-propelled garden tool according to claim 1, characterized in that: Bearings are installed on both the input shaft and the output shaft. The outer ring of the bearing is fixedly connected to the housing, and the inner ring is fixedly connected to the input shaft or the output shaft.

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