A self-propelled device for use in a push lawn care tool

Abstract

The utility model relates to a kind of self-propelled vehicle for hand-push type garden tool, including upper shell, lower shell, power assembly and transmission mechanism, transmission mechanism includes input gear, input shaft and two groups of output mechanism, input gear is fixedly installed in the middle part of input shaft, two groups of output mechanism are symmetrically set in the two sides of input shaft, and output mechanism includes clutch mechanism, output gear, first gear, intermediate wheel and output shaft, clutch mechanism includes overrunning clutch, second gear and limiting device, the upper end of intermediate wheel is engaged with first gear, and the lower end is engaged with second gear, the end of overrunning clutch away from input gear is provided with annular groove, the bottom of annular groove is circumferentially equidistantly spaced and provided with multiple recesses, the side of second gear close to overrunning clutch is circumferentially equidistantly spaced and provided with multiple ball bearings, and ball bearing moves in annular groove when second gear rotates.Using this scheme, output assembly can be separated from input shaft when power off, and the torque of power assembly cannot be transmitted to output assembly, so as to ensure the convenient movement and steering of equipment when power off.

Description

Technical Field

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

[0002] A self-propelled vehicle is a walking assistance device that integrates power, transmission and control systems. It can upgrade traditional hand-push tools (such as lawnmowers and snowplows) into semi-automatic or fully automatic walking equipment, which can reduce the burden on users when pushing heavy machinery and improve work efficiency.

[0003] However, in existing technologies, the drive system of self-propelled vehicles typically consists of a motor connected to the drive wheels via a gear set. In the event of a power outage, the motor and transmission mechanism may remain engaged. Simultaneously, while the self-propelled vehicle controls power transmission via a clutch, the clutch cannot fully disengage during a power outage, leaving the drive wheels still connected to the transmission system. Therefore, during pushing, the internal gears or motor also rotate, increasing resistance and making it difficult to move or turn the device. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a self-propelled device for hand-push garden tools, so that garden tools equipped with this self-propelled device can be easily pushed to move or turn even in the event of a power outage, thereby improving ease of use and work efficiency, and ensuring the continuity and smoothness 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 mechanism for use in hand-operated garden tools includes an upper shell, a lower shell, a power assembly, and a transmission mechanism. The power assembly drives the transmission mechanism. The edges of the upper and lower shells are fixedly connected. The power assembly and transmission mechanism are fixed between the upper and lower shells. The transmission mechanism includes an input gear, an input shaft, and two sets of output mechanisms. The input gear is fixedly mounted in the middle of the input shaft, and the two sets of output mechanisms are symmetrically arranged on both sides of the input shaft. The output mechanism includes a clutch mechanism, an output gear, a first gear, an intermediate gear, and an output shaft. The output gear is mounted on the output shaft, and the first gear is fixedly connected to the output shaft. The engagement mechanism includes an overrunning clutch, a second gear, and a limiting device. The upper end of the intermediate gear meshes with the first gear, and the lower end meshes with the second gear. The second gear and the limiting device are sequentially installed on the side of the overrunning clutch away from the input gear. An annular groove is provided on the end of the overrunning clutch away from the input gear. Multiple recesses are provided at equal intervals around the bottom of the annular groove. Multiple balls are provided at equal intervals around the side of the second gear near the overrunning clutch. When the second gear rotates, the balls move in the annular groove. The overrunning clutch is fixedly connected to the input shaft, and the outer edge of the overrunning clutch meshes with the output gear.

[0007] In this design, the transmission mechanism starts when the power unit is powered on and begins operation. Power is transmitted sequentially through the power unit, input gear, input shaft, clutch mechanism, output gear, and output shaft, driving the wheels of the device to rotate, thus moving the device. When the power unit is powered off, the user can manually push the device; the rotation of the wheels drives the output shaft. The first gear is fixed to the output shaft and rotates with it. The intermediate gear meshes with both the first and second gears, transmitting power from the intermediate gear to the second gear. The second gear has multiple balls, and the bottom of the annular groove has a recess. When a ball moves into the recess, the overrunning clutch is locked; when the ball leaves the recess, the overrunning clutch is unlocked. Thus, as the balls move, the overrunning clutch alternates between locked and unlocked states, allowing the device to move easily even when power is off.

[0008] Furthermore, this solution uses two symmetrical sets of output mechanisms to control the movement of the left and right wheels respectively, ensuring that the two sets of output mechanisms move synchronously and follow the aforementioned power transmission method during straight-line driving. When steering is required, if the device is powered on, the user applies the thrust required for steering. Due to increased resistance, the inner wheel's rotation speed may be lower than the drive shaft's speed. At this time, the overrunning clutch remains locked, continuing to transmit power. The outer wheel, due to its longer path, needs to rotate faster. If its rotation speed exceeds the drive shaft's speed, the overrunning clutch unlocks, allowing the outer wheel to rotate freely, achieving the differential function. In the power-off state, when the user applies the thrust required for steering, the inner wheel's rotation speed decreases due to increased resistance, while the outer wheel needs to rotate faster due to inertia. The overrunning clutch unlocks, allowing the outer wheel to accelerate freely, achieving passive differential.

[0009] With this structure, the output component can be disconnected from the input shaft when power is off, and the torque of the power component cannot be transmitted to the output component, thus enabling the equipment to move and turn easily when power is off.

[0010] Furthermore, the maximum diameter of the output gear's inner bore is the same as the maximum diameter of the output shaft. Two symmetrically arranged limiting parts are positioned on the inner bore of the output gear, and longitudinal sections are symmetrically arranged on both sides of the output shaft. When the output shaft rotates, its longitudinal sections rest against the limiting parts, thereby driving the output gear to rotate. In the structural design of this self-propelled device, the output gear meshes with the overrunning clutch and is mounted on the output shaft. If the output gear and output shaft remain fixedly connected, in the event of a power outage, the rotation of the wheel will directly drive the output shaft to rotate, causing the output gear to rotate accordingly. In this state, the overrunning clutch cannot be unlocked, thus hindering the device's walking and steering functions when power is off. To overcome this problem, two symmetrically arranged limiting parts are positioned on both sides of the output gear's inner bore, and longitudinal sections are also provided on the corresponding sides of the output shaft. This design creates a clearance space between the inner bore of the output gear and the output shaft, allowing for two different relative motion phases between the output shaft and the output gear. In the first stage, when power is transmitted from the wheel to the output shaft and it begins to rotate, the output shaft can rotate freely within the inner bore of the output gear at a certain angle, while the output gear does not rotate accordingly. This ensures that the overrunning clutch can be smoothly unlocked. When the output shaft rotates beyond a specific angle, its longitudinal sections on both sides will make tight contact with the limiting parts of the inner bore of the output gear, thereby locking the output shaft and the output gear. At this point, the overrunning clutch is unlocked, and even if power is still transmitted from the output gear to the overrunning clutch, it will not affect the normal movement and steering of the equipment when power is off.

[0011] Furthermore, the overrunning clutch includes an outer ring gear, an inner ring, a cage, and multiple rollers. The cage is coaxially mounted with the input shaft and includes a first support and a second support, which are fixedly connected. The first support has multiple evenly spaced receiving grooves, in which the rollers are installed. The inner ring is fixedly connected to the input shaft and has a hexagonal structure. The inner ring, the first support, and the outer ring gear are coaxially mounted sequentially from the inside out. The diameter of the first support is larger than that of the second support, and an annular groove is provided on the connecting surface between the first and second supports. In this design, when the input shaft is energized and begins to rotate, the inner ring rotates accordingly. Because the inner ring is hexagonal, its rotation pushes the rollers installed in the receiving grooves outward. When the apex of the inner ring contacts the roller, the roller contacts the inner wall of the outer ring gear. Under the action of friction, the roller locks with the inner wall of the outer ring gear, thereby driving the outer ring gear to rotate. In this way, power is transmitted to the output wheel and ultimately output by the output shaft. In the power-off state, power is transmitted through the output shaft, passing through the first gear and intermediate gear to the second gear. Since the second gear is equipped with ball bearings, as it rotates, the balls move within an annular groove, causing the cage to rotate at a certain angle. At this time, because the inner ring remains fixed, the movement of the cage causes the rollers to move away from the apex of the inner ring, causing the rollers in the receiving groove to retract, unlocking the overrunning clutch, and separating the output assembly from the input shaft, thus allowing the wheels to move or steer freely.

[0012] Furthermore, the limiting device includes a limiting spring and a retaining ring. The limiting spring is installed on the side of the second gear away from the first support, and is sleeved on the second support. The retaining ring is fixedly installed on the side of the second support away from the first support. The limiting device is designed to stabilize the position of the second gear, prevent it from shifting during rotation, and ensure that it can rotate in coordination with the synchronous cage.

[0013] Furthermore, the power assembly includes a motor, a motor gear shaft, a transmission gear, an intermediate shaft, and an intermediate gear shaft. The motor gear shaft is fixedly connected to the motor's rotating shaft. The transmission gear and the intermediate gear shaft are fixedly mounted on the intermediate shaft. The motor gear shaft meshes with the transmission gear, and the intermediate gear shaft meshes with the input wheel. This structure utilizes the meshing principle of multi-stage gears. By cleverly configuring the gear tooth ratio, it achieves a reduction in rotational speed and an increase in torque, meeting the specific requirements of garden tools for low speed and high torque. This design achieves efficient power transmission within a limited space, while also achieving balanced load distribution and extended service life, flexibly adapting to diverse mechanical layout requirements.

[0014] Furthermore, bearings are installed at both ends of the input shaft and the intermediate shaft, and mounting holes are provided on both the upper and lower housings, with the outer rings of the bearings fixedly connected to the mounting holes. 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.

[0015] In summary, this self-propelled device for hand-push garden tools allows the output component to be separated from the input shaft when power is off, preventing the torque of the power component from being transmitted to the output component. Therefore, it is not affected by the motor torque when moving the device, thus enabling convenient movement and steering of the device under power-off conditions. This improves ease of use and work efficiency, and ensures the continuity and smoothness of garden work. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0017] Figure 1 This is a schematic diagram of the power component and transmission mechanism of this utility model;

[0018] Figure 2 This is a cross-sectional view of the present invention;

[0019] Figure 3 This is a schematic diagram of the transmission mechanism of this utility model;

[0020] Figure 4 This is a cross-sectional view of the overrunning clutch of this utility model;

[0021] Figure 5 This is a side view of the output gear and output shaft of this utility model;

[0022] Figure 6 This is a partial structural schematic diagram of the overrunning clutch of this utility model;

[0023] Figure 7 This is a schematic diagram of the structure of the retainer of this utility model;

[0024] The components include: upper shell-1, lower shell-2, power assembly-3, motor-31, motor gear shaft-32, transmission gear-33, intermediate shaft-34, intermediate gear shaft-35, transmission mechanism-4, input gear-5, input shaft-6, output mechanism-7, clutch mechanism-71, overrunning clutch-711, annular groove-7111, outer ring gear-7112, inner ring-7113, cage-7114, roller-7115, first support part-7116, second support part-7117, receiving groove-7118, recess-7119, second gear-712, ball-7121, limiting device-713, limiting spring-7131, fixing ring-7132, output gear-72, limiting part-721, first gear-73, intermediate wheel-74, output shaft-75, longitudinal section-751, bearing-8, and mounting hole-9. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] like Figures 1 to 3 The diagram shows a self-propelled mechanism for a hand-operated garden tool, comprising an upper shell 1, a lower shell 2, a power assembly 3, and a transmission mechanism 4. The power assembly 3 drives the transmission mechanism 4. The edges of the upper shell 1 and the lower shell 2 are fixedly connected. The power assembly 3 and the transmission mechanism 4 are fixed between the upper shell 1 and the lower shell 2. The transmission mechanism 4 includes an input gear 5, an input shaft 6, and two sets of output mechanisms 7. The input gear 5 is fixedly installed in the middle of the input shaft 6. The two sets of output mechanisms 7 are symmetrically arranged on both sides of the input shaft 6. The output mechanism 7 includes a clutch mechanism 71, an output gear 72, a first gear 73, an intermediate gear 74, and an output shaft 75. The output gear 72 is installed on the output shaft 75. The first gear 73 is fixedly connected to the output shaft 75. The clutch mechanism 71 includes an overrunning clutch 711, a second gear 712, and a limiting device 713. The upper end of the intermediate gear 74 meshes with the first gear 73, and the lower end meshes with the second gear 712. The second gear 712 and the limiting device 713 are sequentially installed on the side of the overrunning clutch 711 away from the input gear 5. Figure 4As shown, the end of the overrunning clutch 711 furthest from the input gear 5 is provided with an annular groove 7111, such as... Figure 7 As shown, the bottom of the annular groove 7111 is provided with multiple recesses 7119 at equal intervals in the circumference. The second gear 712 is provided with multiple balls 7121 at equal intervals in the circumference on the side near the overrunning clutch 711. When the second gear 712 rotates, the balls 7121 move in the annular groove 7111. The overrunning clutch 711 is fixedly connected to the input shaft 6, and the outer edge of the overrunning clutch 711 meshes with the output gear 72.

[0028] In this design, when the power assembly 3 is powered on and begins operation, the transmission mechanism 4 is activated. Power is transmitted sequentially through the power assembly 3, input gear 5, input shaft 6, clutch mechanism 71, output gear 72, and output shaft 75, driving the wheels of the device to rotate, thereby moving the device. When the power assembly 3 is powered off, the user can manually push the device, and the rotation of the wheels drives the output shaft 75 to rotate. The first gear 73 is fixed on the output shaft 75 and rotates with the output shaft 75. The intermediate gear 74 meshes with both the first gear 73 and the second gear 712, thus transmitting power to the intermediate gear 74 and then to the second gear 712. The second gear 712 has multiple balls 7121, and the bottom of the annular groove 7111 has a recess 7119. When the balls 7121 move to the recess 7119, the overrunning clutch 711 is locked; when the balls 7121 leave the recess 7119, the overrunning clutch 711 is unlocked. As the ball bearing 7121 moves, the overrunning clutch 711 alternates between locked and unlocked states, thus enabling the device to move easily without power.

[0029] Furthermore, this scheme uses two symmetrical sets of output mechanisms 7 to control the movement of the left and right wheels respectively, ensuring that the two sets of output mechanisms 7 move synchronously in straight-line driving, following the aforementioned power transmission method. When steering is required, if the device is powered on, the user applies the thrust required for steering. Due to increased resistance, the inner wheel's rotation speed may be lower than the drive shaft's speed. At this time, the overrunning clutch 711 remains locked, continuing to transmit power. The outer wheel needs to rotate faster due to its longer path. If its rotation speed exceeds the drive shaft's speed, the overrunning clutch 711 unlocks, allowing the outer wheel to rotate freely, achieving the differential function. In the power-off state, when the user applies the thrust required for steering, the inner wheel's rotation speed decreases due to increased resistance, while the outer wheel needs to rotate faster due to inertia. The overrunning clutch 711 unlocks, allowing the outer wheel to accelerate freely, achieving passive differential.

[0030] With this structure, the output component can be disengaged from the input shaft 6 when power is off, and the torque of the power component 3 cannot be transmitted to the output component, thus enabling the equipment to move and turn easily when power is off.

[0031] As a preferred option, such as Figure 5 As shown, the maximum diameter of the inner bore of the output gear 72 is the same as the maximum diameter of the output shaft 75. Two limiting parts 721 are symmetrically arranged on the inner bore of the output gear 72, and longitudinal sections 751 are symmetrically arranged on both sides of the output shaft 75. When the output shaft 75 rotates, its longitudinal sections 751 rest against the limiting parts 721, thereby driving the output gear 72 to rotate. In the structural design of this self-propelled device, the output gear 72 meshes with the overrunning clutch 711 and is mounted on the output shaft 75. If the output gear 72 and the output shaft 75 remain fixedly connected, in the event of a power outage, the rotation of the wheel will directly drive the output shaft 75 to rotate, thus causing the output gear 72 to rotate as well. In this state, the overrunning clutch 711 cannot be unlocked, thus hindering the device's walking and steering functions when the power is off. To overcome this problem, two limiting parts 721 are symmetrically arranged on both sides of the inner bore of the output gear 72, and longitudinal sections 751 are also provided on the corresponding sides of the output shaft 75. This design creates a clearance space between the inner bore of the output gear 72 and the output shaft 75, allowing for two distinct phases of relative motion between them. In the first phase, when power is transmitted from the wheel to the output shaft 75 and it begins to rotate, the output shaft 75 can freely rotate a certain angle within the inner bore of the output gear 72, while the output gear 72 does not rotate accordingly. This ensures that the overrunning clutch 711 can be smoothly unlocked. When the output shaft 75 rotates beyond a specific angle, its two longitudinal sections 751 will respectively come into close contact with the limiting portion 721 of the inner bore of the output gear 72, thereby locking the output shaft 75 and the output gear 72. At this point, the overrunning clutch 711 is unlocked, and even if power is still transmitted from the output gear 72 to the overrunning clutch 711, it will not affect the normal movement and steering of the equipment when power is off.

[0032] As a preferred option, such as Figure 4 and Figure 6As shown, the overrunning clutch 711 includes an outer ring gear 7112, an inner ring 7113, a retainer 7114, and multiple rollers 7115. The retainer 7114 is coaxially arranged with the input shaft 6. The retainer 7114 includes a first support portion 7116 and a second support portion 7117. The first support portion 7116 and the second support portion 7117 are fixedly connected. Multiple receiving grooves 7118 are evenly spaced on the first support portion 7116. The rollers 7115 are installed in the receiving grooves 7118. The inner ring 7113 is fixedly connected with the input shaft 6. The inner ring 7113 has a hexagonal structure. The inner ring 7113, the first support portion 7116, and the outer ring gear 7112 are coaxially installed from the inside to the outside. The diameter of the first support portion 7116 is larger than that of the second support portion 7117. An annular groove 7111 is provided on the connecting surface of the first support portion 7116 and the second support portion 7117. In this design, when the input shaft 6 is energized and begins to rotate, the inner ring 7113 rotates accordingly. Since the inner ring 7113 is hexagonal, its rotation pushes the roller 7115, which is installed in the receiving groove 7118, outward. When the apex of the inner ring 7113 contacts the roller 7115, the roller 7115 contacts the inner wall of the outer ring gear 7112. Under the action of friction, the roller 7115 locks with the inner wall of the outer ring gear 7112, thereby driving the outer ring gear 7112 to rotate. In this way, power is transmitted to the output wheel and finally output by the output shaft 75. In the de-energized state, power is transmitted from the output shaft 75, passing through the first gear 73 and the intermediate gear 74 to the second gear 712. Since the second gear 712 is equipped with balls 7121, when it rotates, the balls 7121 move in the annular groove 7111, and the cage 7114 rotates accordingly by a certain angle. At this time, since the inner ring 7113 remains fixed, the movement of the cage 7114 will cause the roller 7115 to move away from the apex of the inner ring 7113, and the roller 7115 in the receiving groove 7118 will retract, thereby unlocking the overrunning clutch 711, which will separate the output assembly from the input shaft 6, thus allowing the wheel to move or turn freely.

[0033] As a preferred option, such as Figure 3 As shown, the limiting device 713 includes a limiting spring 7131 and a retaining ring 7132. The limiting spring 7131 is installed on the side of the second gear 712 away from the first support portion 7116, and the limiting spring 7131 is sleeved on the second support portion 7117. The retaining ring 7132 is fixedly installed on the side of the second support portion 7117 away from the first support portion 7116. The limiting device 713 is designed to stabilize the position of the second gear 712, prevent it from shifting during rotation, and ensure that it can rotate in tandem with the synchronous cage 7114.

[0034] As a preferred option, such as Figure 1As shown, the power assembly 3 includes a motor 31, a motor gear shaft 32, a transmission gear 33, an intermediate shaft 34, and an intermediate gear shaft 35. The motor gear shaft 32 is fixedly connected to the rotating shaft of the motor 31. The transmission gear 33 and the intermediate gear shaft 35 are fixedly mounted on the intermediate shaft 34. The motor gear shaft 32 meshes with the transmission gear 33, and the intermediate gear shaft 35 meshes with the input gear 5. This structure utilizes the meshing principle of multi-stage gears. By cleverly configuring the gear tooth ratio, it achieves a reduction in rotational speed and an increase in torque, meeting the specific requirements of garden tools for low speed and high torque. This design achieves efficient power transmission within a limited space, while also achieving balanced load distribution and extended service life, flexibly adapting to diverse mechanical layout requirements.

[0035] As a preferred option, such as Figure 1 and Figure 2 As shown, bearings 8 are installed at both ends of the input shaft 6 and the intermediate shaft 34. Mounting holes 9 are provided on both the upper shell 1 and the lower shell 2, and the outer ring of the bearing 8 is fixedly connected to the mounting holes 9. 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 meshing misalignment or wear caused by wobble.

[0036] In summary, this self-propelled device for hand-push garden tools allows the output component to be separated from the input shaft when power is off, preventing the torque of the power component from being transmitted to the output component. Therefore, it is not affected by the motor torque when moving the device, thus enabling convenient movement and steering of the device under power-off conditions. This improves ease of use and work efficiency, and ensures the continuity and smoothness of garden work.

[0037] 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 device for use in hand-push garden tools, comprising an upper shell, a lower shell, a power component, and a transmission mechanism, wherein the power component drives the transmission mechanism to move, the edges of the upper shell and the lower shell are fixedly connected, and the power component and the transmission mechanism are fixed between the upper shell and the lower shell, characterized in that: The transmission mechanism includes an input gear, an input shaft, and two sets of output mechanisms. The input gear is fixedly installed in the middle of the input shaft, and the two sets of output mechanisms are symmetrically arranged on both sides of the input shaft. Each output mechanism includes a clutch mechanism, an output gear, a first gear, an intermediate gear, and an output shaft. The output gear is installed on the output shaft, and the first gear is fixedly connected to the output shaft. The clutch mechanism includes an overrunning clutch, a second gear, and a limiting device. The upper end of the intermediate gear meshes with the first gear, and the lower end meshes with the second gear. The second gear and the limiting device are sequentially installed on the side of the overrunning clutch away from the input gear. An annular groove is provided at the end of the overrunning clutch away from the input gear, and multiple recesses are circumferentially spaced at equal intervals at the bottom of the annular groove. Multiple balls are circumferentially spaced at equal intervals on the side of the second gear near the overrunning clutch. When the second gear rotates, the balls move in the annular groove. The overrunning clutch is fixedly connected to the input shaft, and the outer edge of the overrunning clutch meshes with the output gear.

2. The self-propelled device for hand-push garden tools according to claim 1, characterized in that: The maximum diameter of the inner hole of the output gear is the same as the maximum diameter of the output shaft. Two limiting parts are symmetrically arranged on the inner hole of the output gear. Longitudinal sectional surfaces are symmetrically arranged on both sides of the output shaft. When the output shaft rotates, its longitudinal sectional surfaces rest against the limiting parts, thereby driving the first gear to rotate.

3. The self-propelled device for hand-push garden tools according to claim 1, characterized in that: The overrunning clutch includes an outer ring gear, an inner ring, a cage, and multiple rollers. The cage is coaxially arranged with the input shaft and includes a first support portion and a second support portion. The first support portion and the second support portion are fixedly connected. The first support portion has multiple receiving grooves evenly spaced on it, and the rollers are installed in the receiving grooves. The inner ring is fixedly connected to the input shaft and has a hexagonal structure. The inner ring, the first support portion, and the outer ring gear are coaxially installed sequentially from the inside out. The diameter of the first support portion is larger than that of the second support portion. The annular groove is provided on the connecting surface between the first support portion and the second support portion.

4. The self-propelled device for hand-push garden tools according to claim 3, characterized in that: The limiting device includes a limiting spring and a fixing ring. The limiting spring is installed on the side of the second gear away from the first support and is sleeved on the second support. The fixing ring is fixedly installed on the side of the second support away from the first support.

5. The self-propelled device for hand-push garden tools according to claim 1, characterized in that: The power assembly includes a motor, a motor gear shaft, a transmission gear, an intermediate shaft, and an intermediate gear shaft. The motor gear shaft is fixedly connected to the motor's rotating shaft. The transmission gear and the intermediate gear shaft are fixedly mounted on the intermediate shaft. The motor gear shaft meshes with the transmission gear, and the intermediate gear shaft meshes with the input wheel.

6. The self-propelled device for hand-push garden tools according to claim 5, characterized in that: Bearings are installed at both ends of the input shaft and the intermediate shaft. Mounting holes are provided on both the upper and lower shells, and the outer ring of the bearing is fixedly connected to the mounting holes.

Images