Mini-tiller transmission case assembly with drum brake

Abstract

The utility model provides a mini-tiller transmission case assembly with a drum brake, and belongs to the technical field of mini-tillers. The mini-tiller transmission case solves the problems that an existing mini-tiller transmission case is complex in structure and poor in braking effect. The mini-tiller transmission case assembly with the drum brake comprises a case body, a transmission bevel gear shaft, an input bevel gear shaft and an output shaft, the transmission bevel gear shaft, the input bevel gear shaft and the output shaft are rotationally arranged in the case body, and a bevel gear on the input bevel gear shaft is in transmission connection with a transmission bevel gear arranged on the transmission bevel gear shaft. A bevel gear on the transmission bevel gear shaft is in transmission connection with an output bevel gear arranged on the output shaft, and the part, extending out of the box body, of the transmission bevel gear shaft is connected with a drum brake. The transmission bevel gear shaft is in transmission connection with the input bevel gear shaft and the output shaft, so that the structure is simplified on the premise of not reducing functions, and the cost and the assembly difficulty are reduced; a drum brake is adopted as a brake structure, so that the brake effect is better; the drum brake is arranged at the upper part of the box body and is convenient to maintain; and the drum brake is arranged at the upper part of the box body and is not influenced by lubricating oil in the box body.

Description

Technical Field

[0001] This utility model belongs to the field of micro-tiller technology and relates to a micro-tiller transmission box assembly with drum brake. Background Technology

[0002] Before reaching the work area, four-wheel drive mini-tillers need to travel on their tires. Traditional four-wheel drive mini-tillers do not have a braking and emergency stopping function. In case of an accident, the only way to stop the mini-tiller is to overcome its inertia. If there are uneven ground, steep slopes, or obstacles in the path, it is difficult to stop the mini-tiller suddenly, and it is easy to collide with the obstacles, resulting in low safety.

[0003] To this end, a Chinese patent discloses a four-wheel drive micro-tiller transmission [authorization announcement number CN214788858U], which includes a front gearbox and a rear gearbox. The rear gearbox includes a drive shaft and an output shaft. A multi-stage gear reduction structure is provided between the drive shaft and the output shaft. The drive shaft and the input shaft are connected by a bevel gear. One end of the drive shaft extends out of the rear gearbox, and a brake mechanism is connected to the end of the drive shaft that extends out of the rear gearbox.

[0004] Because the drive shaft and output shaft are equipped with a multi-stage gear reduction structure, there are many parts, the overall structure is complex, the installation accuracy between the parts cannot be effectively controlled, the assembly is difficult and costly, and it is not competitive. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a relatively simple transmission box assembly for a micro-tiller with a drum brake.

[0006] The objective of this utility model can be achieved through the following technical solution: a micro-tiller transmission box assembly with a drum brake, comprising a box body, a transmission bevel gear shaft, an input bevel gear shaft, and an output shaft rotatably disposed within the box body, wherein the bevel gear on the input bevel gear shaft is connected to the transmission bevel gear on the transmission bevel gear shaft, the bevel gear on the transmission bevel gear shaft is connected to the output bevel gear on the output shaft, and the upper end of the transmission bevel gear shaft extends out of the box body, with a drum brake connected to the portion extending out of the box body.

[0007] The bevel gear on the input bevel gear shaft is an integral part of the shaft itself, meshing with the drive bevel gear mounted on the transmission bevel gear shaft. Similarly, the bevel gear on the transmission bevel gear shaft is an integral part of the shaft itself, meshing with the output bevel gear mounted on the output shaft. This transmission bevel gear shaft connects the input and output shafts, simplifying the structure and reducing cost and assembly difficulty without compromising functionality. A drum brake is used for better braking performance. Positioning the drum brake externally to the housing facilitates maintenance. Furthermore, its placement at the top of the housing prevents it from being affected by lubricating oil inside the housing, resulting in a rational structural design.

[0008] In the aforementioned mini-tiller transmission box assembly with drum brake, the drum brake includes a brake drum fixedly connected to the transmission bevel gear shaft, a fixed plate located above the brake drum, a brake rod and brake pads rotatably located on the fixed plate, and a protrusion on the brake rod. When the brake rod rotates, the protrusion can press the brake pads and make the brake pads press against the brake drum.

[0009] Applying drum brakes, commonly used on motorcycles and tricycles, to mini-tillers results in better braking performance compared to the friction pad brakes used in existing mini-tillers.

[0010] The brake pads are located inside the brake drum and are rotatably mounted on the fixed plate via a positioning shaft. The brake lever is also rotatably mounted on the fixed plate. The two are parallel to each other and parallel to the transmission bevel gear shaft. When the brake lever rotates, the protrusions on it will squeeze the brake pads and cause the brake pads to rotate around the positioning shaft, eventually pressing the brake pads against the inner side of the brake drum.

[0011] In the aforementioned micro-tiller transmission box assembly with drum brake, a flange is provided on the upper part of the box body, a fixing plate is provided on the flange, and the brake drum is located inside the flange.

[0012] The upper end of the transmission bevel gear shaft extends into the flange, which is connected to the housing by bolts. The fixing plate is also connected to the flange by bolts, enclosing the brake drum inside the flange and fixing plate. This protects the brake drum and brake pads, and the design is aesthetically pleasing and easy to assemble. When the brake pads need to be replaced, simply remove the fixing plate, making the operation convenient.

[0013] In the aforementioned mini-tiller transmission assembly with drum brake, there are two brake pads, and a return spring is provided between the two brake pads.

[0014] Both brake pads are rotatably mounted on the same positioning shaft, with the brake lever located between the two brake pads. The brake lever has two protrusions to ensure that the brake pads can be squeezed simultaneously. A return spring is located between the two brake pads, which causes the two brake pads to return to their original position when the brake lever returns to its original position.

[0015] In the aforementioned micro-tiller transmission box assembly with drum brake, the upper end of the brake lever extends out of the fixing plate, and a brake rocker arm is provided at the upper end of the brake lever extending out of the fixing plate.

[0016] The brake rocker arm is connected to the handbrake / foot pedal via a cable. When the handbrake is operated or the foot pedal is pressed, the brake lever is rotated, which causes the brake pads to press against the brake drum, thus achieving braking.

[0017] In the aforementioned mini-tiller transmission assembly with drum brake, an oil seal is provided between the flange and the transmission bevel gear shaft. The oil seal prevents lubricating oil, which lubricates the gears and bearings inside the housing, from entering the flange, further avoiding any impact from the lubricating oil on the drum brake.

[0018] Compared with existing technologies, this mini-tiller transmission assembly with drum brake has the following advantages:

[0019] The input bevel gear shaft and output shaft are connected by a transmission bevel gear shaft, which simplifies the structure and reduces cost and assembly difficulty without reducing functionality; a drum brake is used as the braking structure, which provides better braking effect; the drum brake is located on the upper part of the housing for easy maintenance; the drum brake is located on the upper part of the housing and is not affected by the lubricating oil inside the housing. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the transmission box assembly of a mini-tiller with drum brakes.

[0021] Figure 2 This is another cross-sectional view of the transmission box assembly of a mini-tiller with drum brakes.

[0022] Figure 3 This is a power transmission diagram of the transmission box assembly of a mini-tiller with drum brakes.

[0023] In the diagram, 1. Housing; 2. Drive bevel gear shaft; 3. Input bevel gear shaft; 4. Output shaft; 5. Drive bevel gear; 6. Output bevel gear; 7. Brake drum; 8. Fixing plate; 9. Brake lever; 10. Brake pad; 11. Flange; 12. Positioning shaft; 13. Brake rocker arm; 14. Oil seal. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] like Figure 1 The illustrated mini-tiller transmission assembly with drum brake includes a housing 1, a drive bevel gear shaft 2 rotatably disposed within the housing 1, an input bevel gear shaft 3, and an output shaft 4. The drive bevel gear shaft 2 extends vertically and has multiple bearings between it and the housing 1. The input bevel gear shaft 3 extends horizontally and also has multiple bearings between it and the housing 1. Figure 2As shown, the output shaft 4 is horizontally inserted through the lower part of the housing 1, and multiple bearings are also installed between the output shaft 4 and the housing 1.

[0026] To achieve transmission, such as Figure 1-3 As shown, the bevel gear on the input bevel gear shaft 3 meshes with the transmission bevel gear 5 on the transmission bevel gear shaft 2, and the bevel gear on the transmission bevel gear shaft 2 meshes with the output bevel gear 6 on the output shaft 4. When the input bevel gear shaft 3 rotates, the transmission bevel gear 5 and the transmission bevel gear shaft 2 can be driven to rotate through the bevel gear on it, and then the output bevel gear 6 and the output shaft 4 can be driven to rotate through the bevel gear on the transmission bevel gear shaft 2.

[0027] The input bevel gear shaft 3 and the output shaft 4 are connected by the transmission bevel gear shaft 2, which simplifies the structure and reduces cost and assembly difficulty without reducing functionality.

[0028] The upper end of the transmission bevel gear shaft 2 extends upwards out of the housing 1. A drum brake is connected to the portion of the transmission bevel gear shaft 2 that extends out of the housing 1. The drum brake is the type used on motorcycles and tricycles, and compared to the friction pad brakes used in existing micro-tillers, the drum brake offers better braking performance. The drum brake is located on the outside of the housing 1 for easy maintenance. Positioning the drum brake at the top of the housing 1 prevents it from being affected by the lubricating oil inside the housing 1.

[0029] The upper part of the housing 1 is provided with an upward-facing flange 11, and a drum brake is located inside the flange 11. For example... Figure 1-3 As shown, the drum brake includes a brake drum 7 fixedly connected to the transmission bevel gear shaft 2, a fixed plate 8 located above the brake drum 7, a brake lever 9 rotatably mounted on the fixed plate 8, and a brake pad 10. The flange 11 is connected to the housing 1 by bolts, and the fixed plate 8 is connected to the flange 11 by bolts. The upper end of the transmission bevel gear shaft 2 extends into the flange 11. The brake pad 10 is located inside the brake drum 7 and is rotatably mounted on the fixed plate 8 via the positioning shaft 12. The brake lever 9 is also rotatably mounted on the fixed plate 8. The two are parallel to each other and parallel to the transmission bevel gear shaft 2. When the brake lever 9 rotates, the protrusions on it will squeeze the brake pad 10 and cause the brake pad 10 to rotate around the positioning shaft 12, ultimately causing the brake pad 10 to press against the inner side of the brake drum 7.

[0030] The brake drum 7 and brake pads 10 are protected by the flange 11 and the fixing plate 8. The flange 11 and the fixing plate 8 are aesthetically pleasing and easy to assemble. When the brake pads 10 need to be replaced, the fixing plate 8 can be removed, which is convenient to operate.

[0031] In this embodiment, to improve the braking effect, two brake pads 10 are provided, both of which are rotatably mounted on the same positioning shaft 12. A return spring is provided between the two brake pads 10, which can cause the two brake pads 10 to return inward when the brake lever 9 returns to its original position. The brake lever 9 is located between the two brake pads 10, and two protrusions are provided on the brake lever 9 to ensure that the brake pads 10 can be squeezed simultaneously.

[0032] To facilitate braking operation, such as Figure 1-3 As shown, the upper end of the brake lever 9 extends out of the fixing plate 8, and a brake rocker arm 13 is provided at the upper end of the brake lever 9 extending out of the fixing plate 8. The brake rocker arm 13 is connected to the handbrake / foot pedal via a cable. When the handbrake is operated or the foot pedal is pressed, the brake lever 9 can be rotated, thereby causing the brake pads 10 to press against the brake drum 7, thus achieving braking.

[0033] To further prevent the lubricating oil from affecting the drum brakes, such as Figure 1 and Figure 2 As shown, an oil seal 14 is provided between the flange 11 and the transmission bevel gear shaft 2. The oil seal 14 can prevent the lubricating oil that lubricates the gears and bearings in the housing 1 from entering the flange 11.

[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A mini-tiller transmission case assembly with drum brake, characterized by, The box (1), the transmission bevel gear shaft (2) rotatingly arranged in the box (1), the input bevel gear shaft (3) and the output shaft (4), the bevel gear on the input bevel gear shaft (3) is in transmission with the transmission bevel gear (5) arranged on the transmission bevel gear shaft (2), the bevel gear on the transmission bevel gear shaft (2) is in transmission with the output bevel gear (6) arranged on the output shaft (4), the upper end of the transmission bevel gear shaft (2) is out of the box (1) and the part of the box (1) is connected with the drum brake.

2. The mini-tiller drive case assembly with drum brake of claim 1, wherein, The drum brake includes the brake drum (7) fixedly connected to the transmission bevel gear shaft (2), the fixed plate (8) arranged above the brake drum (7), the brake lever (9) and the brake pad (10) rotatingly arranged on the fixed plate (8), the brake lever (9) is provided with a protrusion, and the protrusion can press the brake pad (10) and make the brake pad (10) tightly contact the brake drum (7) when the brake lever (9) rotates.

3. The mini-tiller drive case assembly with drum brake of claim 2, wherein, The upper part of the box (1) is provided with a flange plate (11), the fixed plate (8) is arranged on the flange plate (11), and the brake drum (7) is arranged in the flange plate (11).

4. The mini-tiller drive case assembly with drum brake of claim 2 or 3, wherein, The brake pad (10) is two, and the reset spring is arranged between the two brake pads (10).

5. The mini-tiller drive case assembly with drum brake as claimed in claim 2 or 3 wherein, The upper end of the brake lever (9) is out of the fixed plate (8), and the brake lever (9) is provided with a brake rocker arm (13) at the upper end out of the fixed plate (8).

6. The micro tiller with drum brake assembly as claimed in claim 3 wherein, The oil seal (14) is arranged between the flange plate (11) and the transmission bevel gear shaft (2).

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