A tractor hydraulic stepless transmission control mechanism

Abstract

A tractor hydraulic stepless speed changer's operating mechanism relates to tractor technical field, including frame assembly, operating component, brake pedal, unlocking sensor and cruise switch. Forward and reverse pedal mechanism is linked with groove through bearing, and hydraulic stepless speed changer control end is driven by reverse pedal mechanism; electromagnet is arranged on one side of forward pedal for cruise locking, unlocking sensor is arranged on brake pedal path, and electromagnet is triggered to power off and automatically unlocked when brake is stepped on. The utility model replaces mechanical structure with electromagnetic locking, simplifies structure and improves cruise speed control precision; brake and cruise unlocking linkage improves safety; rolling friction transmission between pedals makes operation light and smooth; eccentric shaft adjusting positioning mechanism can correct median deviation on line, return force is adjustable and convenient to maintain, and the whole machine operation comfort and reliability are obviously improved.

Description

Technical Field

[0001] This utility model relates to the field of tractor technology, and in particular to a control mechanism for a hydraulic continuously variable transmission for tractors. Background Technology

[0002] With the continuous improvement of agricultural mechanization, small and medium horsepower tractors are widely used for horticultural operations both inside and outside yards, such as loading, mowing, digging, snow removal, and rotary tillage, as well as some light-load agricultural operations. The transmission system of these tractors is typically equipped with a hydraulic continuously variable transmission (HST). Its function is to allow for stepless speed adjustment of the output shaft when power is input in a certain direction of rotation, ensuring that the machine can achieve stepless speed regulation when moving forward or backward. Furthermore, to meet the needs of long-term constant-speed operation and reduce the driver's workload, hydraulic continuously variable transmissions generally also have a cruise control function. This means that after the driver depresses the forward pedal to a certain position, a locking mechanism fixes the pedal, allowing the machine to maintain a constant speed.

[0003] Most tractors on the market currently use a front-to-back arrangement for their forward and reverse pedals, with one pedal for forward movement and the other for reverse. This lack of effective coordination between the two pedals results in an inefficient control layout and poor ease of operation for the driver when switching between forward and reverse in different working conditions. More significantly, the cruise control on existing tractors generally uses a purely mechanical locking structure, employing mechanical latches, pawls, or other components to lock or unlock the forward pedal to a fixed position to achieve cruise control. This mechanical cruise control locking structure has the following drawbacks: First, the large number and complex structure of mechanical locking components not only increase the overall manufacturing cost and assembly difficulty, but also lead to numerous potential failure points and poor reliability. Second, locking and unlocking require manual operation of the mechanical components by the driver, which is laborious, difficult to lock, and makes it hard to quickly and accurately fix the pedal in the target position. Third, the mechanical locking position is fixed or has limited gears, and the position of the pedal is prone to shifting due to vibration after locking, causing changes in the swing angle of the hydraulic continuously variable transmission control end, making it difficult to guarantee the accuracy of cruise speed control and affecting the quality of operation. Fourth, the mechanical locking structure is independent of the braking system. When braking is required in an emergency during cruise, the cruise control lock cannot be automatically released by pressing the brake pedal. The driver must first manually unlock the pedal and then apply the brakes, which involves multiple steps, has a delayed response, and poses a safety hazard.

[0004] Therefore, how to simplify the cruise locking structure, achieve convenient and reliable locking and unlocking, and link cruise unlocking with braking operation to improve cruise speed control accuracy and the handling comfort and safety of small and medium horsepower tractors are technical problems that urgently need to be solved by those skilled in the art. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model discloses a control mechanism for a hydraulic continuously variable transmission for tractors.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] A control mechanism for a hydraulic continuously variable transmission for tractors includes a frame assembly, control components, a brake pedal, an unlock sensor, a cruise switch, and a power output assembly;

[0008] The frame assembly is fixed to the power take-off assembly by frame fixing bolts. The power take-off assembly includes a flywheel. The frame assembly is provided with a fixed shaft.

[0009] The control components include a hydraulic continuously variable transmission, a universal joint assembly, a power input shaft, a torsional damper, an electromagnet, a reverse pedal mechanism, a return mechanism, and a forward pedal mechanism; the torsional damper is fixed on the flywheel, and the hydraulic continuously variable transmission, the universal joint assembly, the power input shaft, and the torsional damper are sequentially connected to form a power transmission path;

[0010] The reverse pedal mechanism, return mechanism, and forward pedal mechanism are all mounted on the frame assembly; the forward pedal mechanism and the reverse pedal mechanism are linked and cooperate with each other, and the reverse pedal mechanism is connected to the control end of the hydraulic continuously variable transmission; the return mechanism is connected to the forward pedal mechanism and is used to drive the forward pedal mechanism to return to its original position.

[0011] The brake pedal is sleeved on a fixed shaft, and the unlocking sensor is set on the action path of the brake pedal; the electromagnet is set on one side of the forward pedal mechanism to lock or unlock the forward pedal mechanism; the cruise switch is controlled by the electromagnet to control its on and off; when the unlocking sensor is triggered, the electromagnet is de-energized to unlock the forward pedal mechanism.

[0012] Preferably, the hydraulic continuously variable transmission (CVT) includes a CVT body and an external rocker arm.

[0013] The hydraulic continuously variable transmission (CVT) body includes a hydraulic CVT input shaft, a hydraulic CVT control rectangular shaft head, and a hydraulic CVT output shaft. The hydraulic CVT input shaft is connected to a universal joint assembly via a coupling, the universal joint assembly is connected to a power input shaft via another coupling, and the power input shaft is connected to a torsional damper via a spline.

[0014] The external rocker arm of the hydraulic continuously variable transmission is provided with a rectangular groove and a strip groove. The external rocker arm of the hydraulic continuously variable transmission is sleeved and fixed to the control rectangular shaft head of the hydraulic continuously variable transmission through the rectangular groove. The strip groove is slidably engaged with the reverse pedal mechanism to convert the pedal pressing action into the swing of the control rectangular shaft head of the hydraulic continuously variable transmission.

[0015] Preferably, the linkage structure between the forward pedal mechanism and the reverse pedal mechanism is as follows:

[0016] The forward pedal mechanism is provided with a first bearing and a second bearing, and the reverse pedal mechanism is provided with a U-shaped groove, a V-shaped groove and a third bearing;

[0017] The first bearing is slidably embedded in the U-shaped groove, the second bearing is slidably embedded in the V-shaped groove, and the third bearing is slidably embedded in the strip groove.

[0018] When one of the forward pedal mechanism or the reverse pedal mechanism is pressed, the other is driven to move in the opposite direction through the linkage structure, and the external rocker arm of the hydraulic continuously variable transmission is driven to swing through the third bearing.

[0019] Preferably, the forward pedal mechanism includes a forward fixed plate assembly, a forward rocker arm assembly, an adjustment and positioning mechanism, an eccentric shaft, and a forward pedal;

[0020] The forward fixed plate assembly is fixed to the frame assembly; the forward rocker arm assembly is rotatably sleeved on the forward fixed plate assembly; the first bearing is rotatably assembled on the forward rocker arm assembly; and the forward pedal is fixed on the forward rocker arm assembly.

[0021] The adjustment and positioning mechanism is mounted on the forward fixed plate assembly via an eccentric shaft and can rotate around the eccentric shaft. The second bearing is rotatably mounted on the adjustment and positioning mechanism. The eccentric shaft is configured to adjust the installation angle of the adjustment and positioning mechanism relative to the forward fixed plate assembly.

[0022] Preferably, the adjustment and positioning mechanism includes an adjustment rocker arm and a spring rod, wherein the spring rod is connected to the adjustment rocker arm;

[0023] The return mechanism includes an adjusting plate, a spring adjusting screw, an adjusting plate, and a return spring; the adjusting plate is fixed to the frame assembly, the spring adjusting screw passes through the adjusting plate and is limited by the adjusting nut, and the adjusting plate is fixed to the spring adjusting screw;

[0024] One end of the return spring is attached to the adjusting plate, and the other end is attached to the spring rod to provide return force for the forward pedal mechanism.

[0025] Preferably, the reverse pedal mechanism includes a reverse fixing plate assembly, a reverse rocker arm assembly, and a reverse pedal;

[0026] The reverse fixing plate assembly is fixed to the frame assembly, the reverse rocker arm assembly is rotatably sleeved on the reverse fixing plate assembly, and the reverse pedal is fixed to the reverse rocker arm assembly;

[0027] The U-shaped groove, V-shaped groove, and third bearing are all mounted on the reversing rocker arm assembly.

[0028] Preferably, it also includes a central controller, a display screen, and wiring harnesses;

[0029] The unlocking sensor, cruise switch, electromagnet, and display screen are all connected to the central controller via the wiring harness.

[0030] The central controller is configured to: in response to the operation signal of the cruise switch, control the electromagnet to be energized or de-energized, and control the display screen to display the corresponding locked or unlocked status; in response to the trigger signal of the unlock sensor, control the electromagnet to be de-energized, and control the display screen to display the unlocked status.

[0031] Preferably, the gap between the electromagnet and the forward pedal in the forward pedal mechanism is 1 ± 0.5 mm.

[0032] By adopting the technical solution described above, this utility model has the following beneficial effects:

[0033] (1) This utility model uses an electromagnet as the actuator for cruise locking and unlocking, replacing the traditional mechanical buckle or pawl locking structure. The locking and unlocking of the forward pedal mechanism is achieved by controlling the on and off of the electromagnet through the cruise switch. This not only simplifies the overall structure of the operating mechanism and reduces manufacturing costs and assembly difficulty, but also avoids the problem of mechanical components moving due to vibration, ensuring the stability of the swing angle of the hydraulic continuously variable transmission control end, thereby improving the control accuracy of cruise speed. At the same time, the electromagnetic locking method is easy to operate and responds quickly, significantly improving the operating comfort of small and medium horsepower tractors.

[0034] (2) In this invention, the unlocking sensor is placed on the action path of the brake pedal and forms a linkage control loop with the central controller and the electromagnet. When the driver presses the brake pedal, the unlocking sensor is triggered and controls the electromagnet to be de-energized, so that the forward pedal mechanism is automatically reset and the cruise control is released under the action of the return mechanism. This design realizes the synchronous linkage between braking operation and cruise unlocking, eliminating the need for the driver to manually unlock in an emergency, shortening the braking response time, effectively eliminating safety hazards, and improving the overall driving safety of the vehicle.

[0035] (3) The forward pedal mechanism and the reverse pedal mechanism of this utility model realize motion transmission through the linkage structure of bearing and groove cooperation, which transforms the sliding friction during the pedaling process into rolling friction, effectively reducing motion resistance and component wear, and making pedal operation more convenient and smooth. At the same time, whether the forward pedal or the reverse pedal is pressed, the other pedal can automatically reverse to give way, avoiding motion interference; and the power transmission path under both working conditions is uniformly transmitted to the hydraulic continuously variable transmission control end through the reverse pedal mechanism, making the overall structure compact, the transmission relationship clear, and improving the coordination and reliability of operation.

[0036] (4) This utility model incorporates an eccentric shaft-based adjustment and positioning mechanism in the forward pedal mechanism, which allows for minor correction of the center position of the hydraulic continuously variable transmission without disassembling parts. This effectively eliminates center position deviations caused by manufacturing or assembly errors or parts wear, preventing the tractor from creeping when the pedal is not pressed. Furthermore, the return mechanism, through the cooperation of the spring adjusting screw and the adjusting nut, allows for online adjustment of the return spring's preload to adapt to different working conditions. Moreover, one return mechanism can simultaneously drive the forward and reverse pedals back to their original positions, further simplifying the structure and facilitating later maintenance and upkeep. Attached Figure Description

[0037] Figure 1 A schematic diagram of the operation and control structure of a tractor hydraulic continuously variable transmission;

[0038] Figure 2 A schematic diagram of the operating mechanism of a tractor hydraulic continuously variable transmission;

[0039] Figure 3 A schematic diagram of the mechanically operated reverse pedal structure of a hydraulic continuously variable transmission;

[0040] Figure 4 A schematic diagram of the mechanically operated forward pedal and adjustment and positioning structure of a hydraulic continuously variable transmission;

[0041] Figure 5 A schematic diagram of the mechanically operated forward pedal and adjustment and positioning components of a hydraulic continuously variable transmission;

[0042] Figure 6 This is a schematic diagram of the pedal return mechanism in the control device of a hydraulic continuously variable transmission (CVT).

[0043] Figure 7 This is a schematic diagram of the external rocker arm structure of a hydraulic continuously variable transmission (CVT).

[0044] Figure 8 This is a schematic diagram illustrating the cruise control principle of a hydraulic continuously variable transmission (CVT).

[0045] In the diagram: 1. Frame assembly; 1.1. Fixed axle; 2. Control assembly; 2.1. Hydraulic continuously variable transmission (CVT); 2.1.1. External rocker arm of the hydraulic CVT; 2.1.1.1. Rectangular slot; 2.1.1.2. Strip slot; 2.1.1.3. Fixing nut; 2.1.1.4. Second fixing bolt; 2.1.2. Hydraulic CVT body; 2.1.2.1. Hydraulic CVT input shaft; 2.1.2.2. Control rectangular shaft head of the hydraulic CVT; 2.1.2.3. Hydraulic CVT... 2.1. Transmission output shaft; 2.2. Universal joint drive assembly; 2.3. Power input shaft; 2.4. Torsional damper; 2.5. Electromagnet; 2.6. Reverse pedal mechanism; 2.6.1. First fixing bolt; 2.6.2. First lubrication device; 2.6.3. Reverse fixing plate assembly; 2.6.4. Reverse rocker arm assembly; 2.6.4.1. U-shaped groove; 2.6.4.2. V-shaped groove; 2.6.4.3. Third bearing; 2.6.5. Reverse pedal fixing bolt; 2.6.6. Reverse pedal; 2. 7. Return Mechanism; 2.7.1 Spring Adjusting Screw; 2.7.2 Adjusting Nut; 2.7.3 Adjusting Mounting Plate; 2.7.4 Return Spring; 2.7.5 Adjusting Plate Fixing Bolt; 2.7.6 Adjusting Plate; 2.8 Forward Pedal Mechanism; 2.8.1 Forward Fixed Plate Assembly; 2.8.2 Second Lubrication Device; 2.8.3 Forward Rocker Arm Assembly; 2.8.3.1 First Bearing; 2.8.3.2 Forward Rocker Arm; 2.8.4 Adjustment and Positioning Mechanism; 2.8.4.1 2.8.4.2, Spring pull rod; 2.8.4.3, Adjusting rocker arm; 2.8.5, Adjusting rocker arm fixing bolt; 2.8.6, Forward pedal fixing bolt; 2.8.7, Forward pedal; 2.8.8, Eccentric shaft; 2.8.9, Forward fixing plate bolt; 3, Brake pedal; 4, Unlock sensor; 5, Central controller; 6, Cruise control switch; 7, Power take-off assembly; 7.1, Flywheel; 8, Display screen; 9, Wiring harness; 10, Frame fixing bolt; 11, Torsional damper fixing bolt. Detailed Implementation

[0046] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0047] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are used only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In this application, unless otherwise expressly specified and limited, the terms "installed," "connected," "joined," "fixed," etc., should be interpreted broadly. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] Combined with appendix Figures 1-8 The present invention discloses a control mechanism for a hydraulic continuously variable transmission (CVT) for a tractor, comprising a frame assembly 1, a control component 2, a brake pedal 3, an unlock sensor 4, a cruise control switch 6, and a power output assembly 7. The frame assembly 1 is fixed to the power output assembly 7, which includes a flywheel 7.1; a fixed shaft 1.1 is provided on the frame assembly 1.

[0049] As attached Figure 2 As shown, the control assembly 2 includes a hydraulic continuously variable transmission 2.1, a universal joint assembly 2.2, a power input shaft 2.3, a torsional damper 2.4, an electromagnet 2.5, a reverse pedal mechanism 2.6, a return mechanism 2.7, and a forward pedal mechanism 2.8. The torsional damper 2.4 is fixed on the flywheel 7.1. The hydraulic continuously variable transmission 2.1, the universal joint assembly 2.2, the power input shaft 2.3, and the torsional damper 2.4 are sequentially connected to form a power transmission path. The reverse pedal mechanism 2.6, the return mechanism 2.7, and the forward pedal mechanism 2.8 are all mounted on the frame assembly 1. The forward pedal mechanism 2.8 and the reverse pedal mechanism 2.6 are linked and connected. The reverse pedal mechanism 2.6 is connected to the control end of the hydraulic continuously variable transmission 2.1. The return mechanism 2.7 is connected to the forward pedal mechanism 2.8 and is used to drive the forward pedal mechanism 2.8 to return. The brake pedal 3 is sleeved on the fixed shaft 1.1. The unlocking sensor 4 is set on the action path of the brake pedal 3. The electromagnet 2.5 is set on one side of the forward pedal mechanism 2.8 and is used to lock or unlock the forward pedal mechanism 2.8. The cruise switch 6 is connected to the electromagnet 2.5 to control its on / off state. When the unlocking sensor 4 is triggered, the electromagnet 2.5 is de-energized to unlock the forward pedal mechanism 2.8.

[0050] like Figure 1 and Figure 2As shown, specifically, the frame assembly 1 is fixed to the power output assembly 7 by the frame fixing bolts 10, forming the mounting base of this control mechanism; the power output assembly 7 outputs power through the rotation of the flywheel 7.1, and the torsional damper 2.4 is fixed to the flywheel 7.1 by the torsional damper fixing bolts 11. The torsional damper 2.4 can buffer the torsional vibration between the power output assembly 7 and the control component 2 while transmitting power, thus protecting the subsequent transmission components.

[0051] In the power transmission path, the hydraulic continuously variable transmission 2.1, the universal joint assembly 2.2, the power input shaft 2.3 and the torsional damper 2.4 are connected in sequence. The power from the power output assembly 7 is transmitted to the hydraulic continuously variable transmission 2.1 via the flywheel 7.1 through the torsional damper 2.4, the power input shaft 2.3 and the universal joint assembly 2.2. The universal joint assembly 2.2 can compensate for the installation deviation and relative displacement between the shafts to ensure continuous and smooth power transmission.

[0052] The reverse pedal mechanism 2.6, the return mechanism 2.7, and the forward pedal mechanism 2.8 are all mounted on the frame assembly 1. These three independent units interact and cooperate to control the hydraulic continuously variable transmission (CVT) 2.1. The forward pedal mechanism 2.8 and the reverse pedal mechanism 2.6 work together, with the reverse pedal mechanism 2.6 connected to the control end of the CVT 2.1. Whether the driver depresses the forward pedal mechanism 2.8 or the reverse pedal mechanism 2.6, the depressing action is ultimately transmitted to the control end of the CVT 2.1 via the reverse pedal mechanism 2.6, enabling the CVT 2.1 to achieve continuously variable transmission output in either forward or reverse direction, thus meeting the needs of the tractor's forward and reverse functions.

[0053] The brake pedal 3 is sleeved on the fixed shaft 1.1 on the frame assembly 1 and can rotate around the fixed shaft 1.1. The unlocking sensor 4 is in contact with the brake pedal 3 and is set on the action path of the brake pedal 3. When the driver presses the brake pedal 3, the unlocking sensor 4 is triggered and sends an unlocking signal, and the electromagnet 2.5 is de-energized.

[0054] The electromagnet 2.5 is adjacent to the forward pedal mechanism 2.8 and serves as the actuator for cruise locking and unlocking. When energized, it generates a magnetic force to hold the forward pedal mechanism 2.8 to complete cruise locking. When de-energized, the magnetic force disappears, and the forward pedal mechanism 2.8 returns to its original position under the action of the return mechanism 2.7 to complete unlocking.

[0055] The method of use in this embodiment is as follows: When the driver depresses the forward pedal mechanism 2.8, the control end of the hydraulic continuously variable transmission 2.1 swings in one direction through the linkage mechanism, realizing the tractor's forward movement and stepless speed adjustment; when the driver depresses the reverse pedal mechanism 2.6, the control end swings in the opposite direction, realizing the tractor's reverse movement and stepless speed adjustment; after releasing the pedal, the return mechanism 2.7 pulls the forward pedal mechanism 2.8 back to its original position, and simultaneously the reverse pedal mechanism 2.6 and the forward pedal mechanism 2.8 automatically return to their original positions, and the hydraulic continuously variable transmission 2.1 returns to the neutral position with zero output speed; when cruise control is needed, the electromagnet 2.5 is energized to attract the forward pedal mechanism 2.8 to complete the locking; when the electromagnet 2.5 is de-energized, the forward pedal mechanism 2.8 is released to unlock the cruise control; during cruise control, pressing the brake pedal 3 triggers the unlock sensor 4, which also de-energizes the electromagnet 2.5 to complete the unlocking. Compared with the existing mechanical cruise control locking structure, this embodiment uses the electromagnet 2.5 to lock or unlock the forward pedal mechanism 2.8, which is convenient and reliable, improving the operating comfort of small and medium horsepower tractors.

[0056] In some embodiments, such as Figure 2 and Figure 7 As shown, the hydraulic continuously variable transmission (CVT) 2.1 includes an external rocker arm 2.1.1 and a body 2.1.2. The body 2.1.2 includes an input shaft 2.1.2.1, a control rectangular shaft head 2.1.2.2, and an output shaft 2.1.2.3. The input shaft 2.1.2.1 is connected to the universal joint assembly 2.2 via a coupling, and the universal joint assembly 2.2 is connected to the power input shaft 2.3 via another coupling. The power input shaft 2.3 is connected to the torsional damper 2.4 via a spline; the external rocker arm 2.1.1 of the hydraulic continuously variable transmission is provided with a rectangular groove 2.1.1.1 and a strip groove 2.1.1.2. The external rocker arm 2.1.1 of the hydraulic continuously variable transmission is sleeved and fixed on the control rectangular shaft head 2.1.2.2 of the hydraulic continuously variable transmission through the rectangular groove 2.1.1.1. The strip groove 2.1.1.2 is slidably engaged with the reverse pedal mechanism 2.6 to convert the pedal pressing action into the swing of the control rectangular shaft head 2.1.2.2 of the hydraulic continuously variable transmission.

[0057] Specifically, all connections are made using splines or couplings, which can transmit large torques and ensure circumferential fixation between shafts, while allowing for a certain degree of axial relative sliding, facilitating assembly and adapting to axial displacement during operation. The external rocker arm 2.1.1 of the hydraulic continuously variable transmission (CVT) is fitted onto the control rectangular shaft head 2.1.2.2 of the CVT via a rectangular slot 2.1.1.1. The fit between the rectangular slot 2.1.1.1 and the rectangular shaft head prevents relative rotation between them. The external rocker arm 2.1.1 of the hydraulic CVT can be axially pressed and fixed onto the control rectangular shaft head 2.1.2.2 by the second fixing bolt 2.1.1.4 and the fixing nut 2.1.1.3, ensuring reliable fixation and convenient assembly and disassembly.

[0058] The power transmission and control process in this embodiment is as follows: the power from the power output assembly 7 is output through the flywheel 7.1 at a certain rotational speed, and then passes sequentially through the torsional damper 2.4, the power input shaft 2.3, and the universal joint assembly 2.2 to the input shaft 2.1.2.1 of the hydraulic continuously variable transmission (CVT). The hydraulic CVT body 2.1.2 achieves the forward and reverse rotation of the output shaft 2.1.2.3 of the hydraulic CVT through the forward and reverse rotation of the external rocker arm 2.1.1 of the hydraulic CVT. The larger the rotation angle of the external rocker arm 2.1.1 of the hydraulic CVT, the higher the output speed of the output shaft 2.1.2.3 of the hydraulic CVT, thus realizing stepless speed output in the forward and reverse directions.

[0059] In some embodiments, the linkage structure between the forward pedal mechanism 2.8 and the reverse pedal mechanism 2.6 is as follows: the forward pedal mechanism 2.8 is provided with a first bearing 2.8.3.1 and a second bearing 2.8.4.1, and the reverse pedal mechanism 2.6 is provided with a U-shaped groove 2.6.4.1, a V-shaped groove 2.6.4.2 and a third bearing 2.6.4.3; the first bearing 2.8.3.1 is slidably embedded in the U-shaped groove 2.6.4.1, the second bearing 2.8.4.1 is slidably embedded in the V-shaped groove 2.6.4.2, and the third bearing 2.6.4.3 is slidably embedded in the strip groove 2.1.1.2;

[0060] When either the forward pedal mechanism 2.8 or the reverse pedal mechanism 2.6 is pressed, the other pedal is driven to move in the opposite direction through the linkage structure, and the external rocker arm 2.1.1 of the hydraulic continuously variable transmission is driven to swing through the third bearing 2.6.4.3.

[0061] like Figures 2 to 5As shown, specifically, the first bearing 2.8.3.1 on the forward pedal mechanism 2.8 contacts the U-shaped groove 2.6.4.1 on the reverse pedal mechanism 2.6, and the first bearing 2.8.3.1 can slide freely within the U-shaped groove 2.6.4.1; the second bearing 2.8.4.1 contacts the V-shaped groove 2.6.4.2 on the reverse pedal mechanism 2.6, and the second bearing 2.8.4.1 can slide within the V-shaped groove 2.6.4.2; the third bearing 2.6.4.3 on the reverse pedal mechanism 2.6 contacts the strip groove 2.1.1.2, and the third bearing 2.6.4.3 can slide within the strip groove 2.1.1.2. This transmission method, using bearings and grooves, transforms the sliding friction during pedaling into rolling friction, reducing motion resistance and wear, making pedal operation easier and transmission smoother.

[0062] The forward function operates as follows: The driver presses the forward pedal 2.8.7, which causes the forward rocker arm assembly 2.8.3 to rotate clockwise. The first bearing 2.8.3.1 and the second bearing 2.8.4.1 on the forward rocker arm assembly 2.8.3 slide clockwise in the U-shaped groove 2.6.4.1 and the V-shaped groove 2.6.4.2, respectively, causing the reverse rocker arm assembly 2.6.4 to rotate counterclockwise. This, in turn, causes the third bearing 2.6.4.3 on the reverse rocker arm assembly 2.6.4 to slide in the strip groove 2.1.1.2 inside the external rocker arm 2.1.1 of the hydraulic continuously variable transmission (CVT), causing the external rocker arm 2.1.1 of the CVT and the control rectangular shaft head 2.1.2.2 of the CVT to rotate clockwise. This results in the output shaft 2.1.2.3 of the CVT rotating counterclockwise, propelling the tractor forward.

[0063] The reverse function works as follows: The driver presses the reverse pedal 2.6.6, which drives the reverse rocker arm assembly 2.6.4 to rotate clockwise on the reverse fixed plate assembly 2.6.3. This causes the third bearing 2.6.4.3 to slide within the slot 2.1.1.2, simultaneously causing the external rocker arm 2.1.1 of the hydraulic continuously variable transmission to rotate counterclockwise. This results in the output shaft 2.1.2.3 of the hydraulic continuously variable transmission rotating clockwise, causing the tractor to reverse. When the reverse rocker arm assembly 2.6.4 rotates clockwise, its U-shaped slot 2.6.4.1 and V-shaped slot 2.6.4.2 rotate clockwise synchronously. This, through the first bearing 2.8.3.1 and the second bearing 2.8.4.1, drives the forward pedal mechanism 2.8 to rotate counterclockwise, thus raising the forward pedal 2.8.7.

[0064] Through the above-mentioned linkage structure, when either of the two pedals is pressed, the other pedal moves in the opposite direction to make way, avoiding motion interference between the forward pedal 2.8.7 and the reverse pedal 2.6.6, and ensuring smooth pedaling action for the driver; at the same time, the third bearing 2.6.4.3 always serves as the output end for driving the external rocker arm 2.1.1 of the hydraulic continuously variable transmission to swing, so that the power transmission path is unified for both forward and reverse working conditions, resulting in a compact structure and clear transmission relationship.

[0065] In some embodiments, the forward pedal mechanism 2.8 includes a forward fixing plate assembly 2.8.1, a forward rocker arm assembly 2.8.3, an adjustment and positioning mechanism 2.8.4, an eccentric shaft 2.8.8, and a forward pedal 2.8.7; the forward fixing plate assembly 2.8.1 is fixed to the frame assembly 1; the forward rocker arm assembly 2.8.3 is rotatably sleeved on the forward fixing plate assembly 2.8.1, and the first bearing 2.8.3.1 is rotatably mounted on the forward rocker arm assembly 2.8.3. The forward pedal 2.8.7 is fixed to the forward rocker arm assembly 2.8.3; the adjustment and positioning mechanism 2.8.4 is mounted on the forward fixed plate assembly 2.8.1 via the eccentric shaft 2.8.8 and can rotate around the eccentric shaft 2.8.8; the second bearing 2.8.4.1 is rotatably mounted on the adjustment and positioning mechanism 2.8.4; the eccentric shaft 2.8.8 is configured to adjust the installation angle of the adjustment and positioning mechanism 2.8.4 relative to the forward fixed plate assembly 2.8.1.

[0066] like Figure 4 and Figure 5 As shown, specifically, the forward mounting plate assembly 2.8.1 is fixed to the frame assembly 1 by the forward mounting plate bolt 2.8.9, and the forward rocker arm assembly 2.8.3 is sleeved on the forward mounting plate assembly 2.8.1 and can rotate around the forward mounting plate assembly 2.8.1; the forward rocker arm assembly 2.8.3 includes a forward rocker arm 2.8.3.2, a first bearing 2.8.3.1 is mounted on the forward rocker arm 2.8.3.2 and can rotate freely, the forward pedal 2.8.7 is fixed to the forward rocker arm 2.8.3.2 by the forward pedal fixing bolt 2.8.6, and the second lubrication device 2.8.2 is screwed onto the forward rocker arm 2.8.3.2 and is used to apply grease to the rotating parts of the forward rocker arm assembly 2.8.3 to reduce wear and extend service life. The eccentric shaft 2.8.8 is rotatably mounted on the forward fixed plate assembly 2.8.1 via the adjusting rocker arm fixing bolt 2.8.5. The adjusting positioning mechanism 2.8.4 is sleeved on the eccentric section of the eccentric shaft 2.8.8 and moves with the rotation of the eccentric shaft 2.8.8. The second bearing 2.8.4.1 is rotatably mounted on the adjusting positioning mechanism 2.8.4.

[0067] The working process of the adjustment and positioning function is as follows: During assembly or adjustment, the eccentric shaft 2.8.8 is rotated using a tool. Due to the eccentricity between the rotation axis of the eccentric shaft 2.8.8 and its mounting axis, the rotation of the eccentric shaft 2.8.8 causes a slight displacement of the adjustment and positioning mechanism 2.8.4 sleeved on its eccentric section. The adjustment and positioning mechanism 2.8.4, through the cooperation of the second bearing 2.8.4.1 and the V-groove 2.6.4.2, causes the backward rocker arm assembly 2.6.4 to rotate slightly around the backward fixed plate assembly 2.6.3, thereby causing a slight rotation of the external rocker arm 2.1.1 of the hydraulic continuously variable transmission, so that the control rectangular shaft head 2.1.2.2 of the hydraulic continuously variable transmission is in the center position. By adjusting the installation angle of the eccentric shaft 2.8.8, the center position of the hydraulic continuously variable transmission 2.1 can be corrected without disassembling parts, eliminating the center position deviation caused by manufacturing or assembly errors or parts wear, and avoiding the crawling phenomenon of the tractor when the pedal is not pressed. The adjustment is convenient and the positioning is accurate.

[0068] In some embodiments, the adjustment positioning mechanism 2.8.4 includes an adjustment rocker arm 2.8.4.3 and a spring rod 2.8.4.2, with the spring rod 2.8.4.2 connected to the adjustment rocker arm 2.8.4.3; the return mechanism 2.7 includes an adjustment plate 2.7.6, a spring adjustment screw 2.7.1, an adjustment mounting plate 2.7.3, and a return spring 2.7.4; the adjustment plate 2.7.6 is fixed to the frame assembly 1, the spring adjustment screw 2.7.1 passes through the adjustment plate 2.7.6 and is limited by the adjustment nut 2.7.2, and the adjustment mounting plate 2.7.3 is fixed to the spring adjustment screw 2.7.1; one end of the return spring 2.7.4 is attached to the adjustment mounting plate 2.7.3, and the other end is attached to the spring rod 2.8.4.2 to provide a return force for the forward pedal mechanism 2.8.

[0069] like Figure 6 As shown, specifically, the adjusting plate 2.7.6 is fixed to the frame assembly 1 by the adjusting plate fixing bolt 2.7.5. The spring adjusting screw 2.7.1 is welded to the adjusting mounting plate 2.7.3. The spring adjusting screw 2.7.1 can move on the adjusting plate 2.7.6 through the adjusting nut 2.7.2. By rotating the adjusting nut 2.7.2, the position of the adjusting mounting plate 2.7.3 relative to the adjusting plate 2.7.6 can be changed, thereby adjusting the preload of the return spring 2.7.4, so that the magnitude of the pedal return force can be adjusted as needed. One end of the return spring 2.7.4 is hung on the adjusting mounting plate 2.7.3, and the other end is hung on the spring pull rod 2.8.4.2. The spring pull rod 2.8.4.2 is welded to the adjusting rocker arm 2.8.4.3, and the adjusting rocker arm 2.8.4.3 is linked with the adjusting positioning mechanism 2.8.4.

[0070] The working process of this embodiment is as follows: When the driver presses the forward pedal 2.8.7 or the reverse pedal 2.6.6, the forward rocker arm assembly 2.8.3 rotates and drives the adjustment and positioning mechanism 2.8.4 and the adjustment rocker arm 2.8.4.3 to swing through the second bearing 2.8.4.1 and the V-groove 2.6.4.2. The spring rod 2.8.4.2 pulls the return spring 2.7.4 to lengthen, and the return spring 2.7.4 stores elastic potential energy. When the driver releases the foot, the return spring 2.7.4 shortens and releases the elastic potential energy, and pulls the forward pedal mechanism 2.8 or the reverse pedal mechanism 2.6 back to its original position through the spring rod 2.8.4.2. At the same time, it drives the external rocker arm 2.1.1 of the hydraulic continuously variable transmission to return to the neutral position, and the output speed of the hydraulic continuously variable transmission output shaft 2.1.2.3 returns to zero. The return spring 2.7.4 acts on the two pedal mechanisms through the adjustment positioning mechanism 2.8.4. One set of return mechanism 2.7 can simultaneously realize the return of the forward pedal mechanism 2.8 and the reverse pedal mechanism 2.6, which is simple in structure. Moreover, the return force can be adjusted online by adjusting nut 2.7.2 without replacing the spring, which is convenient for maintenance.

[0071] In some embodiments, the reverse pedal mechanism 2.6 includes a reverse fixing plate assembly 2.6.3, a reverse rocker arm assembly 2.6.4, and a reverse pedal 2.6.6; the reverse fixing plate assembly 2.6.3 is fixed to the frame assembly 1, the reverse rocker arm assembly 2.6.4 is rotatably sleeved on the reverse fixing plate assembly 2.6.3, and the reverse pedal 2.6.6 is fixed to the reverse rocker arm assembly 2.6.4; the U-shaped groove 2.6.4.1, the V-shaped groove 2.6.4.2, and the third bearing 2.6.4.3 are all provided on the reverse rocker arm assembly 2.6.4.

[0072] like Figure 2 and Figure 3 As shown, specifically, the reverse fixing plate assembly 2.6.3 is fixed to the frame assembly 1 by the first fixing bolt 2.6.1, the reverse rocker arm assembly 2.6.4 is sleeved on the reverse fixing plate assembly 2.6.3 and can rotate around the reverse fixing plate assembly 2.6.3, the first lubrication device 2.6.2 is fixed on the reverse rocker arm assembly 2.6.4 and is used to apply grease to the rotating parts of the reverse rocker arm assembly 2.6.4 to reduce wear and ensure flexible rotation; the reverse pedal 2.6.6 is fixed to the reverse rocker arm assembly 2.6.4 by the reverse pedal fixing bolt 2.6.5, and the third bearing 2.6.4.3 is fixed on the reverse rocker arm assembly 2.6.4 and can rotate freely. The reverse rocker arm assembly 2.6.4 integrates the U-shaped groove 2.6.4.1, the V-shaped groove 2.6.4.2, and the third bearing 2.6.4.3. It serves as both the actuator for the reverse function and the linkage between the forward pedal mechanism 2.8 and the external rocker arm 2.1.1 of the hydraulic continuously variable transmission.

[0073] The working process of this embodiment is as follows: The driver presses the reverse pedal 2.6.6 with his foot. The reverse pedal 2.6.6 drives the reverse rocker arm assembly 2.6.4 to rotate clockwise on the reverse fixed plate assembly 2.6.3. The third bearing 2.6.4.3 moves with the reverse rocker arm assembly 2.6.4 and slides on the strip groove 2.1.1.2, which drives the external rocker arm 2.1.1 of the hydraulic continuously variable transmission to rotate counterclockwise. The control rectangular shaft head 2.1.2.2 of the hydraulic continuously variable transmission swings counterclockwise accordingly, so that the output shaft 2.1.2.3 of the hydraulic continuously variable transmission rotates clockwise, and the tractor moves backward. The greater the pedal angle, the higher the reverse speed.

[0074] In some embodiments, the control mechanism further includes a central controller 5, a display screen 8, and a wiring harness 9; the unlock sensor 4, cruise switch 6, electromagnet 2.5, and display screen 8 are all signal-connected to the central controller 5 via the wiring harness 9; the central controller 5 is configured to: control the electromagnet 2.5 to be energized or de-energized in response to the operation signal of the cruise switch 6, and control the display screen 8 to display the corresponding locked or unlocked state; and control the electromagnet 2.5 to be de-energized in response to the trigger signal of the unlock sensor 4, and control the display screen 8 to display the unlocked state.

[0075] like Figure 1 , Figure 2 and Figure 8 As shown, specifically, the unlock sensor 4, cruise switch 6, central controller 5, display screen 8, and electromagnet 2.5 are connected by wiring harness 9 to form a control unit, constituting a complete control loop.

[0076] The cruise control locking process is as follows: When the driver depresses the forward pedal 2.8.7 to a certain position, if they wish to maintain a constant speed of the hydraulic continuously variable transmission (CVT) output shaft 2.1.2.3, they press the cruise control switch 6. The signal is transmitted from the wiring harness 9 to the central controller 5. The central controller 5 then sends an energizing signal to the electromagnet 2.5. The electromagnet 2.5 generates magnetic force, which attracts the forward pedal 2.8.7, fixing its position and completing the locking function. At this time, the position of the forward pedal mechanism 2.8 is fixed, the swing angle of the external rocker arm 2.1.1 of the CVT is also fixed, and the output speed of the CVT output shaft 2.1.2.3 remains constant, allowing the tractor to cruise at the set speed. Simultaneously, the locking signal is displayed on the screen 8 for the driver to confirm the cruise status. Cruise control can be unlocked by operating the cruise control switch 6 again.

[0077] The brake unlocking process is as follows: When the driver wants to brake, they press the brake pedal 3. The brake pedal 3 rotates around the fixed shaft 1.1 and triggers the unlocking sensor 4 in contact with it. The unlocking sensor 4 sends an unlocking signal, which is transmitted to the central controller 5 via the wiring harness 9. The central controller 5 sends a power-off signal, which is transmitted to the electromagnet 2.5 via the wiring harness 9. After the electromagnet 2.5 is de-energized, its magnetic force disappears, and the forward pedal 2.8.7 resets under the action of the return spring 2.7.4 of the return mechanism 2.7, completing the unlocking function. At the same time, the unlocking signal is displayed on the display screen 8, and the lock display disappears. By setting the unlocking sensor 4 on the action path of the brake pedal 3, the braking operation is linked with the cruise unlocking. The cruise function is automatically disengaged when the driver presses the brake pedal 3 to decelerate, which conforms to driving habits and improves driving safety. The use of the electromagnet 2.5 in conjunction with the central controller 5 to realize cruise locking and unlocking eliminates the existing mechanical cruise locking structure, making locking and unlocking convenient and reliable, and ensuring speed control accuracy.

[0078] In some embodiments, the gap between the electromagnet 2.5 and the forward pedal 2.8.7 in the forward pedal mechanism 2.8 is 1 ± 0.5 mm. Figure 1 and Figure 2 As shown, specifically, the electromagnet 2.5 is installed on the control assembly 2 near the forward pedal 2.8.7, with a gap of 1±0.5mm between the electromagnet 2.5 and the forward pedal 2.8.7. This gap ensures that the electromagnet 2.5 does not contact the forward pedal 2.8.7 when the power is off, thus not affecting the normal pressing and return actions of the forward pedal 2.8.7. When the cruise switch 6 is pressed and the electromagnet 2.5 is energized, the forward pedal 2.8.7 is exactly within the effective magnetic attraction range of the electromagnet 2.5, allowing the electromagnet 2.5 to reliably hold the forward pedal 2.8.7, ensuring that the pedal position does not move in the cruise lock state, thereby ensuring stable cruise speed.

[0079] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to include all changes that fall within the meaning and scope of equivalents within this utility model.

Claims

1. A control mechanism for a hydraulic continuously variable transmission (CVT) for a tractor, characterized in that, include: The chassis assembly (1), control components (2), brake pedal (3), unlock sensor (4), cruise switch (6) and power output assembly (7); The frame assembly (1) is fixed to the power output assembly (7) by frame fixing bolts (10), and the power output assembly (7) includes a flywheel (7.1); the frame assembly (1) is provided with a fixed shaft (1.1). The control assembly (2) includes a hydraulic continuously variable transmission (2.1), a universal joint assembly (2.2), a power input shaft (2.3), a torsional damper (2.4), an electromagnet (2.5), a reverse pedal mechanism (2.6), a return mechanism (2.7), and a forward pedal mechanism (2.8); the torsional damper (2.4) is fixed on the flywheel (7.1), and the hydraulic continuously variable transmission (2.1), the universal joint assembly (2.2), the power input shaft (2.3), and the torsional damper (2.4) are sequentially connected to form a power transmission path; The reverse pedal mechanism (2.6), return mechanism (2.7), and forward pedal mechanism (2.8) are all mounted on the frame assembly (1); the forward pedal mechanism (2.8) is linked to the reverse pedal mechanism (2.6), and the reverse pedal mechanism (2.6) is connected to the control end of the hydraulic continuously variable transmission (2.1); the return mechanism (2.7) is connected to the forward pedal mechanism (2.8) and is used to drive the forward pedal mechanism (2.8) to return to its original position; The brake pedal (3) is sleeved on the fixed shaft (1.1), and the unlocking sensor (4) is set on the action path of the brake pedal (3); the electromagnet (2.5) is set on one side of the forward pedal mechanism (2.8) for locking or unlocking the forward pedal mechanism (2.8); the cruise switch (6) is connected to the electromagnet (2.5) to control its on and off; when the unlocking sensor (4) is triggered, the electromagnet (2.5) is de-energized to unlock the forward pedal mechanism (2.8).

2. The operating mechanism of the hydraulic continuously variable transmission for tractors according to claim 1, characterized in that, The hydraulic continuously variable transmission (2.1) includes a hydraulic continuously variable transmission body (2.1.2) and an external rocker arm (2.1.1) of the hydraulic continuously variable transmission. The hydraulic continuously variable transmission (CVT) body (2.1.2) includes a hydraulic CVT input shaft (2.1.2.1), a hydraulic CVT control rectangular shaft head (2.1.2.2), and a hydraulic CVT output shaft (2.1.2.3). The hydraulic CVT input shaft (2.1.2.1) is connected to the universal joint assembly (2.2) via a coupling. The universal joint assembly (2.2) is connected to the power input shaft (2.3) via another coupling. The power input shaft (2.3) is connected to the torsional damper (2.4) via a spline. The external rocker arm (2.1.1) of the hydraulic continuously variable transmission is provided with a rectangular groove ( 2.1.1.1) and strip groove (2.1.1.2), the external rocker arm (2.1.1) of the hydraulic continuously variable transmission is sleeved and fixed on the control rectangular shaft head (2.1.2.2) of the hydraulic continuously variable transmission through the rectangular groove (2.1.1.1), and the strip groove (2.1.1.2) slides with the reverse pedal mechanism (2.6) to convert the pedal pressing action into the swing of the control rectangular shaft head (2.1.2.2) of the hydraulic continuously variable transmission.

3. The operating mechanism of the hydraulic continuously variable transmission for tractors according to claim 2, characterized in that, The linkage structure between the forward pedal mechanism (2.8) and the reverse pedal mechanism (2.6) is as follows: The forward pedal mechanism (2.8) is provided with a first bearing (2.8.3.1) and a second bearing (2.8.4.1), and the reverse pedal mechanism (2.6) is provided with a U-shaped groove (2.6.4.1), a V-shaped groove (2.6.4.2) and a third bearing (2.6.4.3). The first bearing (2.8.3.1) is slidably embedded in the U-shaped groove (2.6.4.1), the second bearing (2.8.4.1) is slidably embedded in the V-shaped groove (2.6.4.2), and the third bearing (2.6.4.3) is slidably embedded in the strip groove (2.6.4.3). 2.1.1.2) within; When one of the forward pedal mechanism (2.8) or the reverse pedal mechanism (2.6) is pressed, the other is driven to move in the opposite direction through the linkage structure, and the external rocker arm (2.1.1) of the hydraulic continuously variable transmission is driven to swing through the third bearing (2.6.4.3).

4. The operating mechanism of the hydraulic continuously variable transmission for tractors according to claim 3, characterized in that, The forward pedal mechanism (2.8) includes a forward fixed plate assembly (2.8.1), a forward rocker arm assembly (2.8.3), an adjustment and positioning mechanism (2.8.4), an eccentric shaft (2.8.8), and a forward pedal (2.8.7). The forward fixed plate assembly (2.8.1) is fixed to the frame assembly (1); the forward rocker arm assembly (2.8.3) is rotatably sleeved on the forward fixed plate assembly (2.8.1), the first bearing (2.8.3.1) is rotatably assembled on the forward rocker arm assembly (2.8.3), and the forward pedal (2.8.7) is fixed on the forward rocker arm assembly (2.8.3); The adjustment and positioning mechanism (2.8.4) is mounted on the forward fixed plate assembly (2.8.1) via an eccentric shaft (2.8.8) and can rotate around the eccentric shaft (2.8.8). The second bearing (2.8.4.1) is rotatably mounted on the adjustment and positioning mechanism (2.8.4). The eccentric shaft (2.8.8) is configured to adjust the installation angle of the adjustment and positioning mechanism (2.8.4) relative to the forward fixed plate assembly (2.8.1).

5. The operating mechanism of the hydraulic continuously variable transmission for tractors according to claim 4, characterized in that, The adjustment and positioning mechanism (2.8.4) includes an adjustment rocker arm (2.8.4.3) and a spring rod (2.8.4.2), wherein the spring rod (2.8.4.2) is connected to the adjustment rocker arm (2.8.4.3); The return mechanism (2.7) includes an adjusting plate (2.7.6), a spring adjusting screw (2.7.1), an adjusting mounting plate (2.7.3), and a return spring (2.7.4); the adjusting plate (2.7.6) is fixed on the frame assembly (1), the spring adjusting screw (2.7.1) passes through the adjusting plate (2.7.6) and is limited by the adjusting nut (2.7.2), and the adjusting mounting plate (2.7.3) is fixed on the spring adjusting screw (2.7.1); One end of the return spring (2.7.4) is attached to the adjusting plate (2.7.3), and the other end is attached to the spring rod (2.8.4.2) to provide return force for the forward pedal mechanism (2.8).

6. The operating mechanism of the hydraulic continuously variable transmission for tractors according to claim 5, characterized in that, The reversing pedal mechanism (2.6) includes a reversing fixed plate assembly (2.6.3), a reversing rocker arm assembly (2.6.4), and a reversing pedal (2.6.6). The reverse fixing plate assembly (2.6.3) is fixed to the frame assembly (1), the reverse rocker arm assembly (2.6.4) is rotatably sleeved on the reverse fixing plate assembly (2.6.3), and the reverse pedal (2.6.6) is fixed to the reverse rocker arm assembly (2.6.4); The U-shaped groove (2.6.4.1), V-shaped groove (2.6.4.2), and third bearing (2.6.4.3) are all mounted on the reversing rocker arm assembly (2.6.4).

7. The operating mechanism of the hydraulic continuously variable transmission for tractors according to claim 1, characterized in that, It also includes a central controller (5), a display screen (8), and wiring harnesses (9); The unlocking sensor (4), cruise switch (6), electromagnet (2.5) and display screen (8) are all connected to the central controller (5) via the wiring harness (9); The central controller (5) is configured to: control the electromagnet (2.5) to be energized or de-energized in response to the operation signal of the cruise switch (6), and control the display screen (8) to display the corresponding locked or unlocked state; and control the electromagnet (2.5) to be de-energized in response to the trigger signal of the unlock sensor (4), and control the display screen (8) to display the unlocked state.

8. The operating mechanism of the hydraulic continuously variable transmission for tractors according to claim 1, characterized in that, The gap between the electromagnet (2.5) and the forward pedal (2.8.7) in the forward pedal mechanism (2.8) is 1±0.5mm.

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