Gear brake structure and garden tool

Abstract

The present application relates to a kind of gear brake structure and garden tools, including motor, gear transmission assembly, gear brake assembly and output shaft assembly, the gear brake assembly includes brake pad and brake pad, the motor drives gear transmission assembly rotation, the brake pad is realized with the automatic disengagement or tight of brake pad with the rotation or stop of the motor to realize start or brake.The process of braking and starting of the present application is automatically realized, i.e. gear brake is automatically released or locked by the start-stop of machine, when motor is not started, brake pad is locked with brake pad in brake state, when motor is started, brake pad is released from brake pad in release state.

Description

Technical Field

[0001] This invention relates to the field of garden tool technology, and in particular to a gear brake structure and a garden tool having a gear brake structure. Background Technology

[0002] In existing technologies, the braking structure of garden tools generally uses the friction between the brake pads and the iron sheet to achieve braking. This braking method is limited to products with belt drive structure and cannot be expanded to more products. Belt drive structure is complex, with more parts, which will generate more mold costs and labor costs, making the overall cost of the machine higher and resulting in products that are not competitive. In addition, belt drive is prone to slippage. The belt is elastic and when it slips, the transmission ratio is not constant and the transmission is not stable enough. Summary of the Invention

[0003] The purpose of this invention is to provide a gear brake structure with fewer parts, a simple and compact structure, no slippage, and stable transmission.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a gear brake structure, comprising a motor, a gear transmission assembly, a gear brake assembly, and an output shaft assembly. The gear brake assembly includes brake pads and brake shoes. The motor drives the gear transmission assembly to rotate. The brake pads automatically disengage from or engage with the brake shoes as the motor rotates or stops, thereby achieving starting or braking.

[0005] Preferably, the motor is mounted on a motor bracket, the gear brake assembly is positioned between the output shaft assembly and the motor bracket, the brake pads are fixed to the motor bracket, and the brake discs are fixed to the output shaft assembly.

[0006] Preferably, the gear transmission assembly includes a small gear and a large gear meshing with each other on a motor bracket. The small gear is mounted on the output shaft of the motor, and the large gear is mounted on the motor bracket. The output shaft assembly is mounted on the axis of the large gear. The motor drives the small gear to rotate, the small gear drives the large gear to rotate, and the rotation of the large gear causes the output shaft assembly to rotate.

[0007] Preferably, when the motor starts, the output shaft assembly is stationary at the moment of startup. When the large gear rotates at a certain angle, the large gear pushes the output shaft assembly to rotate, causing the brake pads to disengage from the brake shoes, and the machine operates at high speed.

[0008] Preferably, a reset component is provided between the output shaft assembly and the large gear. When the machine is powered off, the output shaft assembly synchronously drives the brake pads to reset under the action of the reset component.

[0009] Preferably, the reset assembly includes a spring, one end of which is connected to a large gear, and the other end of which is connected to an output shaft assembly.

[0010] Preferably, the output shaft assembly is provided with a plurality of arc-shaped mounting portions at equal intervals in the circumference, the top of the arc-shaped mounting portion is provided with a rotating shaft, one end of the brake pad is rotatably mounted on the rotating shaft, the top of the brake pad is provided with a protective plate, the bottom of the arc-shaped mounting portion is provided with a stop block, and the rotating shaft and the stop block are arranged to avoid each other.

[0011] Preferably, the large gear is provided with a sliding groove, and a spring mounting position is provided in the sliding groove. One end of the spring is fixed to the spring mounting position, and the other end of the spring is connected to a stop block. The stop block rotates with the output shaft assembly and slides along the sliding groove to stretch or compress the spring.

[0012] Preferably, the large gear is provided with a limiting post, and a clearance position is provided between two adjacent arc-shaped mounting parts. When the large gear is assembled with the output shaft assembly, the limiting post is set in the clearance position and cooperates with the arc-shaped mounting part and the brake pad to limit the movement.

[0013] Another object of the present invention is to provide a garden tool including the aforementioned gear brake structure.

[0014] By adopting the above technical solution, the present invention has the following advantages:

[0015] 1. The braking and starting processes of this invention are automated. When the motor is not started, the brake pads are tightly engaged with the brake shoes and are in a braking state. When the motor starts, the brake pads disengage from the brake shoes and are in a released state.

[0016] 2. This invention has fewer parts, a simple structure, and is easy to assemble, which reduces costs, facilitates manufacturing and installation, and has a low overall cost while saving labor costs;

[0017] 2. This invention adopts a gear brake structure, which, compared with existing transmission belts and transmission chains, is not limited to the transmission method and can be widely applied to more products, with strong versatility;

[0018] 3. The gear brake assembly of the present invention has a stable braking function and also has a protective plate on the brake pads to effectively prevent the brake pads from moving up and down during operation;

[0019] 4. The present invention has a stable structure, high transmission accuracy, wider applicability, high transmission efficiency, strong vibration damping and impact resistance, is not prone to slippage, is stable and reliable in operation, and has a longer service life. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] Figure 1 This is a schematic axial cross-sectional view of Embodiment 1 of the present invention;

[0022] Figure 2 This is an exploded view of Embodiment 1 of the present invention;

[0023] Figure 3 This is a schematic diagram of the large gear structure in Embodiment 1 of the present invention;

[0024] Figure 4 This is a schematic diagram of the output shaft assembly structure in Embodiment 1 of the present invention;

[0025] Figure 5 This is a schematic diagram of the brake pads and brake discs being in a clamped state in Embodiment 1 of the present invention;

[0026] Figure 6 This is a schematic diagram of the brake pads and brake discs being in a released state in Embodiment 1 of the present invention;

[0027] Figure 7 This is a cross-sectional view of the installation position of the gear brake assembly in Embodiment 3 of the present invention;

[0028] Figure 8 This is a cross-sectional view of the installation position of the gear brake assembly in Embodiment 4 of the present invention.

[0029] Figure label:

[0030] 1. Motor; 2. Motor bracket; 3. Gear transmission assembly; 31. Pinion; 32. Gear; 321. Slide groove; 322. Spring assembly position; 323. Limiting post; 4. Gear brake assembly; 41. Brake pad; 42. Brake lining; 5. Output shaft assembly; 51. Arc-shaped mounting part; 52. Rotating shaft; 53. Stop block; 54. Clearance position; 6. Spring; 7. Protective plate; 8. First bearing; 9. Second bearing; 10. Third bearing; 11. Screw; 12. Fixing base; 13. Blade; 14. Battery pack. Detailed Implementation

[0031] To more clearly illustrate the overall concept of the present invention, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," etc., indicating orientation or positional relationships, are based solely on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0032] Example 1

[0033] A gear brake structure, such as Figures 1-6As shown, it includes a motor 1, a gear transmission assembly 3, a gear brake assembly 4, and an output shaft assembly 5. The gear brake assembly 4 includes a brake pad 41 and a brake lining 42. The motor 1 drives the gear transmission assembly 3 to rotate. The brake pad 41 automatically disengages from or engages with the brake lining 42 as the motor 1 rotates or stops, thereby achieving starting or braking.

[0034] To improve the stability of the overall mechanism, the motor 1 is mounted on the motor bracket 2 via the first bearing 8 and fixed with screws 11. The motor bracket 2 is mounted on the fixed seat 12 and fixed with screws 11. The gear transmission assembly 3, the gear brake assembly 4, and the output shaft assembly 5 are assembled between the motor bracket 2 and the fixed seat 12. The gear brake assembly 4 is located between the output shaft assembly 5 and the motor bracket 2. The brake pad 42 is fixed on the motor bracket 2, and the brake slab 41 is fixed on the output shaft assembly 5.

[0035] To simplify the structure and facilitate assembly, the gear transmission assembly 3 includes a small gear 31 and a large gear 32 that mesh with each other and are mounted on the motor bracket 2. The small gear 31 is mounted on the output shaft of the motor 1, and the large gear 32 is mounted on the motor bracket 2. The output shaft assembly 5 is mounted on the axis of the large gear 32. The motor 1 drives the small gear 31 to rotate, and the small gear 31 drives the large gear 32 to rotate. The rotation of the large gear 32 drives the output shaft assembly 5 to rotate. The two ends of the output shaft assembly 5 are respectively mounted on the motor bracket 2 and the fixed base 12 through the second bearing 9 and the third bearing 10.

[0036] The present invention uses a gear transmission component 3, which, compared with existing transmission belts and transmission chains, has higher transmission accuracy, a wider range of applications, fewer accessories, reduced costs, is easier to manufacture and install, has high transmission efficiency, and has strong vibration damping and impact resistance, is less prone to slippage, is more reliable in operation, and has a longer service life.

[0037] To facilitate automatic reset after braking, a reset assembly is provided between the output shaft assembly 5 and the large gear 32. When the machine is powered off, the output shaft assembly 5 synchronously drives the brake pad 41 to reset under the action of the reset assembly. The reset assembly includes a spring 6, one end of which is connected to the large gear 32, and the other end of which is connected to the output shaft assembly 5. In practical applications, the spring 6 can also be replaced by an equivalent accessory such as an elastic sheet.

[0038] For ease of assembly, the output shaft assembly 5 is provided with several arc-shaped mounting portions 51 at equal intervals around its circumference. A rotating shaft 52 is located at the top of each arc-shaped mounting portion 51. One end of the brake pad 41 is rotatably mounted on the rotating shaft 52. A protective plate 7 is located at the top of the brake pad 41, and the protective plate 7 is fixed to the output shaft assembly 5 by screws 11. A stop block 53 is located at the bottom of each arc-shaped mounting portion 51, and the rotating shaft 52 and the stop block 53 are arranged to avoid each other. The protective plate 7 effectively prevents the brake pad 41 from moving up and down.

[0039] The large gear 32 is provided with a sliding groove 321, and a spring mounting position 322 is provided in the sliding groove 321. One end of the spring 6 is fixed to the spring mounting position 322, and the other end of the spring 6 is connected to a stop block 53. The stop block 53 rotates with the output shaft assembly 5 and slides along the sliding groove 321 to stretch or compress the spring 6. A clearance position 54 is provided between two adjacent arc-shaped mounting parts 51. When the large gear 32 is assembled with the output shaft assembly 5, the limiting post 323 is set in the clearance position 54, and the clearance position 54 cooperates with the arc-shaped mounting part 51 and the brake pad 41 to limit the movement.

[0040] Braking method:

[0041] When motor 1 is not started, brake pad 41 and brake lining 42 are engaged in a braking state.

[0042] When motor 1 starts, at the moment of startup, the output shaft of motor 1 drives the pinion 31 to rotate. The rotation of pinion 31 drives the large gear 32 to rotate, and the rotation of large gear 32 drives the output shaft assembly 5 to rotate. At this time, the output shaft assembly 5 is stationary due to the combined action of the weight of the blade, the pressure of the protective plate 7, and the friction between the brake pad 41 and the brake pad 42. When the large gear 32 rotates a certain angle, the large gear 32 pushes the output shaft assembly 5 to rotate, causing the brake pad 41 to disengage from the brake pad 42, and the machine runs at high speed.

[0043] When the motor 1 is de-energized, the output shaft assembly 5 will return to its original position due to the pressure of the spring 6, thereby causing the brake pad 41 to return to its original position. At this time, the brake pad 41 will be subjected to the pressure of the limit post 323, pressing against the brake pad 42, thereby achieving braking.

[0044] Example 2

[0045] Another object of the present invention is to provide a garden tool including the aforementioned gear brake structure.

[0046] Other content not described in this embodiment can be found in Embodiment 1.

[0047] Example 3

[0048] When the aforementioned gear brake structure is applied to an AC lawnmower, the installation positions of the motor 1, motor bracket 2, gear transmission assembly 3, gear brake assembly 4, and blade 13 are as follows: Figure 7 As shown.

[0049] Other content not described in this embodiment can be found in Embodiment 1.

[0050] Example 4

[0051] When the aforementioned gear brake structure is applied to a DC lawnmower, the mounting positions of the motor 1, motor bracket 2, gear transmission assembly 3, gear brake assembly 4, blade 13, and battery pack 14 are as follows: Figure 8 As shown.

[0052] Other content not described in this embodiment can be found in Embodiment 1.

[0053] In addition to the preferred embodiments described above, there are other embodiments of the present invention. Those skilled in the art can make various changes and modifications based on the present invention, and all such changes and modifications should fall within the scope defined by the appended claims, as long as they do not depart from the spirit of the present invention.

Claims

1. A gear brake structure, characterized in that: It includes a motor, a gear transmission assembly, a gear brake assembly, and an output shaft assembly. The gear brake assembly includes brake pads and brake shoes. The motor drives the gear transmission assembly to rotate. The brake pads automatically disengage from or engage with the brake shoes as the motor rotates or stops, thereby achieving starting or braking. The motor is mounted on a motor bracket, the gear brake assembly is positioned between the output shaft assembly and the motor bracket, the brake pads are fixed to the motor bracket, the brake discs are fixed to the output shaft assembly, and the gear transmission assembly includes a small gear and a large gear meshing with each other and mounted on the motor bracket. The small gear is mounted on the output shaft of the motor, the large gear is mounted on the motor bracket, and the output shaft assembly is positioned at the axis of the large gear. The motor drives the small gear to rotate, the small gear drives the large gear to rotate, and the rotation of the large gear causes the output shaft assembly to rotate. A reset component is provided between the output shaft assembly and the large gear. When the machine is powered off, the output shaft assembly synchronously drives the brake pad to reset under the action of the reset component. The reset component includes a spring, one end of which is connected to the large gear and the other end of which is connected to the output shaft assembly. The output shaft assembly is provided with several arc-shaped mounting parts at equal intervals around its circumference. A rotating shaft is provided at the top of each arc-shaped mounting part. One end of the brake pad is rotatably mounted on the rotating shaft. A protective plate is provided at the top of the brake pad. A stop is provided at the bottom of each arc-shaped mounting part. The rotating shaft and the stop are arranged to avoid each other.

2. The gear brake structure according to claim 1, characterized in that: When the motor starts, the output shaft assembly is stationary at the moment of startup. When the large gear rotates at a certain angle, the large gear pushes the output shaft assembly to rotate, causing the brake pads to disengage from the brake shoes, and the machine runs at high speed.

3. The gear brake structure according to claim 1, characterized in that: The large gear is provided with a sliding groove, and a spring mounting position is provided in the sliding groove. One end of the spring is fixed to the spring mounting position, and the other end of the spring is connected to a stop block. The stop block rotates with the output shaft assembly and slides along the sliding groove to stretch or compress the spring.

4. The gear brake structure according to claim 3, characterized in that: The large gear is provided with a limiting post, and there is a clearance position between two adjacent arc-shaped mounting parts. When the large gear is assembled with the output shaft assembly, the limiting post is set in the clearance position and cooperates with the arc-shaped mounting part and the brake pad to limit the movement.

5. A garden tool, characterized in that: Includes the gear brake structure as described in any one of claims 1-4.

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