Reverse gear protection device and mini-tiller

Abstract

The reverse gear protection device comprises a reverse gear control handle and a gear shifting rod, the reverse gear control handle is connected with a reverse gear control inhaul cable, the reverse gear control inhaul cable is connected with a limiting mechanism, the limiting mechanism is fixedly connected with an armrest seat, the limiting mechanism is matched with a gear shifting rocker arm, and the gear shifting rocker arm is fixedly connected with the armrest seat. The reverse gear control handle is connected with the working clutch inhaul cable, and the working clutch inhaul cable is connected with the separating mechanism. The limiting mechanism is provided with a sleeve, and the sleeve is provided with a second elastic element. By means of the collaborative design of the limiting mechanism, the gear shifting rocker arm and other components, potential safety hazards of reverse gear operation of the mini-tiller are effectively avoided, safer and more convenient use experience is provided for operators, and remarkable social benefits and economic benefits are achieved.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery, and in particular to a reverse gear protection device and a micro-tiller. Background Technology

[0002] As a type of small agricultural tillage machinery, the shifting safety performance of the gearbox in a mini tiller is directly related to the personal safety of the operator and the reliability of the equipment. Traditional mini tillers have significant safety hazards when operating in reverse gear, mainly in two aspects: First, the gearbox lacks an effective reverse gear misoperation protection mechanism. The operator may accidentally engage reverse gear while moving, causing the transmission system to bear a sudden reverse load and resulting in mechanical damage. Second, and more seriously, existing equipment still has working parts (such as the rotary tiller shaft) running when reverse gear is engaged. If the operator does not cut off the power output in time, the high-speed rotating tilling parts can easily cause serious mechanical injury to operators at close range.

[0003] While some existing models employ mechanical interlocking devices to restrict reverse gear operation, they generally suffer from the following technical drawbacks: interlocking mechanisms often use a single limit design, only physically limiting the gear shift lever and failing to simultaneously cut off power to the working components; the operation process is cumbersome, requiring separate steps for power cut-off and gear shift unlocking, which can easily lead to accidents due to operational delays in emergency situations; and the mechanical linkage devices lack reliability, prone to limit failure or incomplete disengagement after prolonged use. Particularly noteworthy is the fact that in complex working conditions such as slope operations, operators often need to frequently switch directions, exacerbating the safety deficiencies of existing technologies. Therefore, developing a new type of mini-tiller has become an urgent problem for those skilled in the art. Utility Model Content

[0004] This utility model aims to provide a reverse gear protection device and a mini-tiller. Through the coordinated design of the limiting mechanism and the shift rocker arm, it effectively solves the safety hazards of reverse gear operation in mini-tillers, providing operators with a safer and more convenient user experience, and has significant social and economic benefits. To achieve the above objectives, the specific technical solutions of the reverse gear protection device and mini-tiller of this utility model are as follows:

[0005] A reverse gear protection device includes a reverse gear control handle and a gear shift lever. The reverse gear control handle is connected to a reverse gear control cable, the reverse gear control cable is connected to a limiting mechanism, the limiting mechanism is fixedly connected to a handrail seat, the limiting mechanism cooperates with a gear shift rocker arm, the reverse gear control handle is connected to a working clutch cable, and the working clutch cable is connected to a disengagement mechanism.

[0006] The limiting mechanism is provided with a sleeve, and the sleeve is provided with a second elastic element.

[0007] Compared with existing technologies, the advantages of this utility model are as follows: The reverse gear protection device for the micro-tiller provided by this product achieves multiple safety protection functions through an innovative mechanical linkage design, exhibiting significant practicality and reliability advantages; through the coordinated design of the limit mechanism and other components such as the shift rocker arm, the shift limit shaft in the limit mechanism can block the shifting action of the shift rocker arm when not shifting into reverse gear; when the operator needs to shift into reverse gear, the reverse gear control handle is first pulled up, and the reverse gear control cable is tightened as the handle is pulled up. At the same time, the limit shaft fixed on the cable is pulled upward, so that the position of the limit shaft no longer blocks the shifting action of the shift rocker arm, thus completing the reverse gear action. This design ensures timely power cut-off. The system ensures thorough and complete disengagement, preventing mechanical failures or safety accidents caused by incomplete disengagement. Combined with the reverse gear protection device's forced limit design on the shift rocker arm, it fundamentally eliminates the possibility of accidentally engaging reverse gear during operation, improving equipment safety. The single-handle control design allows the operator to simultaneously complete both power cut-off and gear unlocking by simply pulling the reverse gear control handle, simplifying the operation process and improving work efficiency. It is particularly suitable for work scenarios requiring frequent reversing. The entire protection device is highly integrated with the gearbox body, without increasing the equipment's size, maintaining the tiller's lightweight and flexible characteristics, and facilitating maintenance. It is suitable for tilling operations in various terrain conditions, especially in complex conditions such as slopes, where its safety protection performance is even more outstanding. Through the implementation of the above technical solutions, this product effectively solves the safety hazards of reverse gear operation in tillers, providing operators with a safer and more convenient user experience.

[0008] Furthermore, the shift lever is connected to the outer shift fork shaft, and the outer shift fork shaft passes through the bushing of the armrest seat and is connected to the shift rocker arm.

[0009] The beneficial effect of adopting the above-mentioned further technical solution is that by connecting the outer shift fork shaft through the bushing of the armrest seat and the shift rocker arm, the shifting action can be transmitted to the outer shift fork shaft when the operator operates the shift lever to perform the shifting action.

[0010] Furthermore, the shift rocker arm is movably connected to the shift fork shaft, the shift fork shaft is provided with a shift fork, and the shift fork is connected to the shift teeth.

[0011] The beneficial effects of adopting the above-mentioned further technical solution are as follows: by movably connecting the shift rocker arm and the shift fork shaft, the shifting action on the shift rocker arm is transmitted to the shift fork shaft in a rotational manner; by providing a shift fork on the shift fork shaft, the shift fork can slide on the shift fork shaft; by connecting the shift fork to the shift teeth, when the shift fork slides on the shift fork shaft, it can drive the shift teeth to slide and mesh with different teeth, thereby realizing the shifting action; by movably connecting the shift rocker arm to the working clutch cable, the action of the shift rocker arm can be transmitted to the working clutch cable, and the working clutch cable can perform the next action.

[0012] Furthermore, the separation mechanism is provided with a working shift fork shaft, which is movably connected to the working shift fork;

[0013] The separation mechanism is provided with a working input shaft and a working transmission shaft. The working input shaft is provided with a fixed clutch tooth, and the working transmission shaft is provided with a first elastic element. The first elastic element is connected to a sliding clutch tooth, and the sliding clutch tooth cooperates with the fixed clutch tooth.

[0014] The working fork is connected to the sliding clutch teeth.

[0015] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The separation mechanism includes a working fork shaft, which receives the action of the working clutch cable and transmits it to the next step; the working fork shaft is movably connected to the working fork, enabling the working fork shaft to drive the working fork to perform separation work; the separation mechanism includes a working input shaft and a working transmission shaft, dividing the transmission shaft of the working part into a connecting part, namely, a working input shaft and a working transmission shaft; the working input shaft is equipped with fixed clutch teeth, which are fixed on the working input shaft and do not move; the working transmission shaft is equipped with a first elastic element, which is connected to a sliding clutch tooth, allowing the first elastic element and the sliding clutch tooth to cooperate. When the working fork applies external force to move the sliding clutch tooth, it will exert pressure on the first elastic element, causing the sliding clutch tooth to disconnect from the fixed clutch tooth. When the external force disappears, the first elastic element pushes the sliding clutch tooth to reconnect with the fixed clutch tooth, thus allowing the power transmission of the working part to continue.

[0016] Furthermore, the working clutch cable is equipped with a handrail support lug.

[0017] The beneficial effect of adopting the above-mentioned further technical solution is that the working clutch cable is provided with a handrail support, which enables the handrail support to control the working clutch cable and adjust the tension of the working clutch cable.

[0018] Furthermore, the limiting mechanism includes a hollow bolt fixed to the sleeve and a limiting shaft slidably connected to the sleeve, wherein the hollow bolt and the limiting shaft are connected by a second elastic element.

[0019] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The limiting mechanism is equipped with a hollow bolt and a limiting shaft, allowing the limiting mechanism to perform limiting through the cooperation of the hollow bolt and the limiting shaft; the hollow bolt is fixedly connected to the sleeve, and the limiting shaft is slidably connected to the sleeve, ensuring the hollow bolt is fixed to the sleeve and cannot move, while the limiting shaft can slide inside the sleeve to cooperate with the reverse gear control cable. When the reverse gear control cable drives the limiting shaft to slide upwards, the limiting shaft will allow the shift rocker arm to move out of position, enabling the shift rocker arm to perform the next shift action; the hollow bolt and the limiting shaft are connected through a second elastic element, allowing the second elastic element to automatically return to its original position after the reverse gear control cable pulls the limiting shaft upwards, thus continuing to limit the movement of the shift rocker arm.

[0020] A mini-tiller, including the reverse gear protection device as described in any of the above-mentioned further technical solutions.

[0021] Compared with existing technologies, the beneficial effects of this invention are as follows: by setting a reverse gear protection device on the mini tiller, the timeliness and thoroughness of power cut-off are ensured, avoiding mechanical failures or safety accidents caused by incomplete separation. In addition, combined with the forced limit design of the shift rocker arm by the reverse gear protection device, the possibility of accidentally engaging reverse gear during operation is fundamentally eliminated, thus improving the safety of using the mini tiller. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the reverse gear protection device of this utility model;

[0023] Figure 2 This is a partial top view of the reverse gear protection device of this utility model;

[0024] Figure 3 This is a partial enlarged view of the limiting mechanism of this utility model;

[0025] 1. Reverse gear control handle; 2. Reverse gear control cable; 3. Limiting mechanism; 4. Shift fork shaft; 5. Working clutch cable; 6. Disengagement mechanism; 7. Gear shift lever; 8. Armrest seat; 9. Gear shift rocker arm; 10. Working shift fork shaft; 11. Working shift fork; 12. Working input shaft; 13. Working transmission shaft; 14. Fixed clutch gear; 15. First elastic element; 16. Sliding clutch gear; 17. Shift fork shaft; 18. Shift fork; 19. Shift gear; 21. Second elastic element; 22. Armrest support lug; 23. Sleeve; 2001. Hollow bolt; 2002. Limiting shaft. Detailed Implementation

[0026] To better understand the purpose, structure, and function of this invention, a mini-tiller of this utility model will be described in further detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] like Figure 1-3 As shown, where Figure 2 To facilitate structural viewing, the structure of the armrest seat 8 is concealed. This utility model's reverse gear protection device includes a reverse gear control handle 1, which allows the operator to release control of the shift rocker arm 9, enabling reverse gear switching; a shift lever 7, which allows the operator to perform gear shifting actions; the reverse gear control handle 1 is connected to a reverse gear control cable 2, which, when the reverse gear control handle 1 is moved, controls the reverse gear control cable 2, thus controlling the shift rocker arm 9. Limiting the shift rocker arm 9 provides protection against reverse gear shifting; the reverse gear control cable 2 is connected to a limiting mechanism 3, which, when controlled by the reverse gear control handle 1, drives the limiting mechanism 3 to either release or set its limit. The movement of the gear shift mechanism is as follows: The limiting mechanism 3 is fixedly connected to the armrest seat 8, allowing the limiting mechanism 3 to use the armrest seat 8 as the point of force application to achieve the limiting action; the limiting mechanism 3 cooperates with the shift rocker arm 9, allowing the limiting mechanism 3 to restrict the movement of the shift rocker arm 9; the reverse gear control handle 1 is connected to the working clutch cable 5, allowing the reverse gear control handle 1 to simultaneously control the movement of the reverse gear control cable 2 and the working clutch cable 5 when the reverse gear control handle 1 is moved; the working clutch cable 5 is connected to the disengagement mechanism 6, allowing the movement on the working clutch cable 5 to be transmitted to the disengagement mechanism 6, and the disengagement mechanism 6 to stop the power transmission of the working part, providing protection for the operator's gear shifting operation.

[0029] In this embodiment, the limiting mechanism 3 is provided with a sleeve 23, which is fixed together with the armrest seat 8. The sleeve 23 is provided with a limiting shaft 2002. By providing the limiting shaft 2002 inside the sleeve 23, the limiting shaft 2002 can move inside the sleeve 23 and limit the shift rocker arm 9. The limiting mechanism 3 is connected by a second elastic element 21, so that after the limiting shaft 2002 is pulled up, it can return to its original position through the second elastic element 21 and continue to limit the shift rocker arm 9.

[0030] In this embodiment, the shift lever 7 is connected to the outer shift fork shaft 4. This connection allows the operator to transmit the shifting action on the shift lever 7 to the outer shift fork shaft 4 during shifting. The outer shift fork shaft 4 passes through the bushing of the armrest seat 8 and is connected to the shift rocker arm 9. This transmission of the action on the outer shift fork shaft 4 to the shift rocker arm 9 via the armrest seat 8 allows the action to be transmitted to the shift rocker arm 9, which then transmits the action to the next step.

[0031] In this embodiment, the shift rocker arm 9 is movably connected to the shift fork shaft 17. This movable connection allows the movement of the shift rocker arm 9 to be transmitted to the shift fork shaft 17. The shift fork shaft 17 is equipped with a shift fork 18, which allows it to slide on the shaft. The shift fork 18 is connected to a shift gear 19. This connection allows the shift fork 18 to engage different gears on the shift fork shaft 17 when it slides, thus completing the shifting of different gears.

[0032] In this embodiment, the separation mechanism 6 is equipped with a working fork shaft 10. The working fork shaft 10 allows the separation mechanism 6 to transmit and interrupt power. The working fork shaft 10 is movably connected to a working fork 11, allowing the working fork 11 to perform fork movements via the working fork shaft 10. The separation mechanism 6 is equipped with a working input shaft 12 and a working transmission shaft 13. The working input shaft 12 and the working transmission shaft 13 divide the transmission shaft of the working part into two parts, facilitating the interruption and transmission of working power. The working input shaft 12 is equipped with a fixed clutch tooth 14, and the working transmission shaft 13 is equipped with a first elastic element 15. The first elastic element 15 is connected to a sliding clutch tooth 16, which engages with the fixed clutch tooth 14. Through the working input shaft 12... A fixed clutch tooth 14 is provided, and the working transmission shaft 13 is provided with a first elastic element 15. The first elastic element 15 is connected to a sliding clutch tooth 16. The sliding clutch tooth 16 cooperates with the fixed clutch tooth 14, so that the sliding clutch tooth 16 and the fixed clutch tooth 14 are engaged. The sliding clutch tooth 16 is connected to the first elastic element 15, so that after the sliding clutch tooth 16 loses its force, it will be returned to its position with the fixed clutch tooth 14 by the force of the first elastic element 15, thereby continuing the transmission of power to the working part. The working fork 11 is connected to the sliding clutch tooth 16. Through the connection between the working fork 11 and the sliding clutch tooth 16, the working clutch cable 5 drives the working fork shaft 10 and the working fork 11 to move. The movement is transmitted to the sliding clutch tooth 16 through the working fork 11, disengaging the sliding clutch tooth 16 from the fixed clutch tooth 14, thereby interrupting the power to the working part.

[0033] In this embodiment, the working clutch cable 5 is provided with a handrail bracket 22. The tension of the working clutch cable 5 is controlled by the handrail bracket 22.

[0034] The limiting mechanism 3 in this embodiment includes a hollow bolt 2001 fixed to the sleeve 23 and a limiting shaft 2002 slidably connected to the sleeve 23. The limiting mechanism 3, with its hollow bolt 2001 and limiting shaft 2002, allows them to cooperate to achieve a limiting function. The hollow bolt 2001 is fixedly connected to the sleeve 23, and the limiting shaft 2002 is slidably connected to the sleeve 23, allowing the limiting shaft 2002 to slide within the sleeve 23 and cooperate with the hollow bolt 2001. The hollow bolt 2001 and the limiting shaft 2002 are connected by a second elastic element 21, and the hollow bolt 2001 and the limiting shaft 2002 are connected by a second elastic element 21. Two elastic elements 21 are connected, so that a second elastic element 21 is provided between the hollow bolt 2001 and the limiting shaft 2002. The reverse gear control cable 2 passes through the hollow bolt 2001 and is connected to the limiting shaft 2002. When the operation is performed, the reverse gear control cable 2 drives the limiting shaft 2002 to move upward, making room for the original position of the limiting shaft 2002, so that the shift rocker arm 9 can perform the shifting action. When the reverse gear control cable 2 does not apply an upward force to the limiting shaft 2002, the second elastic element 21 between the hollow bolt 2001 and the limiting shaft 2002 will form a downward pushing force on the limiting shaft 2002, so that it can return to its original position and continue to restrict the movement of the shift rocker arm 9.

[0035] The mini-tiller in this embodiment includes a reverse gear protection device. When the machine is about to engage reverse gear, the reverse gear protection device will prevent the shift rocker arm 9 from rotating. This prevents direct engagement of reverse gear. To engage reverse gear, the operator must pull up the reverse gear control handle 1. When the reverse gear control handle 1 is pulled up, the limit shaft 2002 is raised via the reverse gear control cable 2. At this time, the operator can shift gears using the shift lever 7. Additionally, simultaneously with pulling up the reverse gear control handle 1, the working clutch cable 5 pulls the working shift fork shaft 10. The working shift fork shaft 10 drives the working shift fork 11, which in turn engages the sliding clutch tooth 16. The sliding clutch tooth 16 disengages from the fixed clutch tooth 14, and the working drive shaft 13 stops rotating. This avoids the danger of the machine continuing to operate while reverse gear is engaged.

[0036] This utility model, through the coordinated design of the limiting mechanism 3 and the shift rocker arm 9, ensures that when not shifting into reverse, the limiting shaft 2002 in the limiting mechanism 3 can block the shifting action of the shift rocker arm 9. When the operator needs to shift into reverse, the reverse control handle 1 is pulled up first. The reverse control cable 2 is tightened as the reverse control handle 1 is pulled up, and at the same time, the limiting shaft 2002 fixed on the reverse control cable 2 is pulled upward, so that the position of the limiting shaft 2002 no longer blocks the shifting action of the shift rocker arm 9, thus completing the reverse action. This design ensures the timeliness and thoroughness of power cut-off, avoiding mechanical failures or safety accidents caused by incomplete separation. Combined with the forced limiting design of the shift rocker arm 9 by the reverse protection device, the possibility of accidentally engaging reverse during travel is fundamentally eliminated, improving the safety of the equipment.

[0037] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A reverse gear protection device, comprising a reverse gear control handle (1) and a gear shift lever (7), wherein the reverse gear control handle (1) is connected to a reverse gear control cable (2), characterized in that: The reverse gear control cable (2) is connected to the limiting mechanism (3), the limiting mechanism (3) is fixedly connected to the armrest seat (8), the limiting mechanism (3) cooperates with the shift rocker arm (9), the reverse gear control handle (1) is connected to the working clutch cable (5), and the working clutch cable (5) is connected to the separation mechanism (6). The limiting mechanism (3) is provided with a sleeve (23), and the sleeve (23) is provided with a second elastic element (21).

2. The reverse gear protection device according to claim 1, characterized in that: The shift lever (7) is connected to the shift outer fork shaft (4), and the shift outer fork shaft (4) passes through the bushing of the armrest seat (8) and is connected to the shift rocker arm (9).

3. The reverse gear protection device according to claim 2, characterized in that: The shift rocker arm (9) is movably connected to the shift fork shaft (17), and the shift fork shaft (17) is provided with a shift fork (18), which is connected to the shift teeth (19).

4. The reverse gear protection device according to claim 1, characterized in that: The separation mechanism (6) is provided with a working fork shaft (10), which is movably connected to the working fork (11); The separation mechanism (6) is provided with a working input shaft (12) and a working transmission shaft (13). The working input shaft (12) is provided with a fixed clutch tooth (14). The working transmission shaft (13) is provided with a first elastic element (15). The first elastic element (15) is connected to a sliding clutch tooth (16). The sliding clutch tooth (16) cooperates with the fixed clutch tooth (14). The working fork (11) is connected to the sliding clutch tooth (16).

5. The reverse gear protection device according to claim 3, characterized in that: The working clutch cable (5) is provided with a handrail support lug (22).

6. The reverse gear protection device according to claim 1, characterized in that: The limiting mechanism (3) includes a hollow bolt (2001) fixed to the sleeve (23) and a limiting shaft (2002) slidably connected to the sleeve (23). The hollow bolt (2001) and the limiting shaft (2002) are connected by a second elastic element (21).

7. A micro-tiller, characterized in that, Includes the reverse gear protection device as described in any one of claims 1-6.

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