A tractor clutch booster device

Abstract

The present invention relates to the technical field of tractors, and particularly relates to a clutch boosting device for a tractor. The clutch boosting device for a tractor is applied to a tractor, which includes a fixed shaft, a pedal assembly, and a rocker arm. The fixed shaft is disposed on the tractor, the pedal assembly is hinged to the fixed shaft, the rocker arm is hinged to the fixed shaft and fixedly connected to the pedal assembly; the clutch boosting device for a tractor includes an outer sleeve, a combined disc spring, and two connecting blocks. The axis of the outer sleeve is perpendicular to the axis of the fixed shaft. The combined disc spring is coaxially inserted into the outer sleeve. The two connecting blocks are inserted into the outer sleeve and are respectively located at both ends of the combined disc spring, and both form a stop fit with the combined disc spring. One of the connecting blocks is connected to the rocker arm and can slide along the axial direction of the outer sleeve, and the other connecting block is connected to the tractor. Thus, the variable stiffness characteristic of the disc spring can be utilized to improve the matching degree between the clutch separation characteristic and the clutch operation movement characteristic during the boosting process.

Description

Technical Field

[0001] The present invention relates to the technical field of tractors, and particularly to a clutch boosting device for a tractor. Background Art

[0002] The tractor clutch is a key component in the tractor transmission system, and its main function is to control the power transmission between the engine and the transmission system to ensure that the tractor can start, shift gears, and stop smoothly.

[0003] When the tractor is working in the field, the clutch needs to be operated frequently, that is, the driver needs to step on the clutch pedal frequently, which is likely to increase the driver's driving fatigue. To improve the operating comfort, a boosting mechanism is often used to assist the driver in stepping on the clutch pedal. The existing boosting mechanisms mainly include a hydraulic boosting mechanism and a spring mechanical boosting mechanism. Among them, the spring mechanical boosting mechanism has been widely used due to its advantages of simple structure, low cost, and low failure rate.

[0004] In the related art, for example, Chinese Patent CN108394275B discloses a clutch pedal boosting mechanism, which adopts a linkage mode of a compression spring and a torsion spring to achieve double boosting for clutch operation.

[0005] However, the above clutch pedal boosting mechanism also has some problems during the boosting process: Since the load deformation characteristic of the compression spring is linear, its boosting characteristic is quite different from the clutch separation load characteristic, which is likely to cause inconvenience in clutch operation and thus affect the service performance of the boosting mechanism. Summary of the Invention

[0006] Based on this, it is necessary to provide a clutch boosting device for a tractor aiming at the problem of poor service performance existing in the current tractor clutch boosting mechanism during use.

[0007] The above object is achieved by the following technical solutions:

[0008] A clutch boosting device for a tractor is applied to a tractor. The tractor includes a fixed shaft, a pedal assembly, and a rocker arm. The fixed shaft is arranged on the tractor; the pedal assembly is hinged to the fixed shaft; the rocker arm is hinged to the fixed shaft and fixedly connected to the pedal assembly. The clutch boosting device for a tractor includes an outer sleeve, a combined disc spring, and two connecting blocks. The axis of the outer sleeve is perpendicular to the axis of the fixed shaft; the combined disc spring is coaxially inserted into the outer sleeve; the two connecting blocks are inserted into the outer sleeve and are respectively located at two sections of the combined disc spring, and both form a stop fit with the combined disc spring. One of the connecting blocks is connected to the rocker arm and can slide along the axis direction of the outer sleeve, and the other connecting block is connected to the tractor.

[0009] Furthermore, the combined disc spring has multiple disc spring groups, which are arranged along the axis of the outer sleeve, and adjacent disc spring groups are arranged in an opposing manner; each disc spring group has at least one disc spring. When a disc spring group has two or more disc springs, all the disc springs in the same disc spring group are stacked; two connecting blocks are respectively hinged to the rocker arm and the tractor.

[0010] Furthermore, the number of outer sleeves is two or more, and a combined disc spring and two connecting blocks are inserted into each outer sleeve; each combined disc spring has multiple disc spring groups, and adjacent disc spring groups of the same combined disc spring are arranged in an opposing manner; each disc spring group has at least one disc spring. When a disc spring group has two or more disc springs, all the disc springs in the same disc spring group are stacked; the tractor clutch boosting device further includes a first adjustment mechanism and two end caps, which are respectively hinged to the rocker arm and the tractor and are respectively connected to the two connecting blocks; the first adjustment mechanism is configured to be able to adjust the number of combined disc springs that establish a force transmission path with the pedal assembly.

[0011] Furthermore, the first adjustment mechanism includes multiple screw sleeves and multiple first connecting columns. The screw sleeves are arranged on the end caps and can rotate around their own axes; the first connecting columns are threadedly inserted into the screw sleeves, and one end of the first connecting column is inserted into the slidable connecting block and can form a stop fit with the slidable connecting block.

[0012] Furthermore, the first adjustment mechanism further includes multiple second connecting columns and multiple force transmission members. The second connecting columns are threadedly inserted into the screw sleeves, and one end of the second connecting column is fixedly arranged on the force transmission member; the force transmission member can form a stop fit with at least two slidable connecting blocks located at the same end in different outer sleeves.

[0013] Furthermore, both connecting blocks can slide along the axis direction of the outer sleeve; the number of the first adjustment mechanisms is two, and the two first adjustment mechanisms are respectively arranged between the connecting blocks and the end caps.

[0014] Furthermore, the tractor clutch boosting device includes a second adjustment mechanism and multiple inner cylinders. The diameters of the multiple inner cylinders are different, and the multiple inner cylinders are coaxially inserted into the outer sleeve; the combined disc spring has multiple large disc spring groups. The diameters of the multiple large disc spring groups are different, and they are respectively coaxially inserted into different inner cylinders; each large disc spring group has multiple small disc spring groups. The multiple small disc spring groups of the same large disc spring group are arranged along the axis of the outer sleeve, and adjacent small disc spring groups of the same large disc spring group are arranged in an opposing manner; each small disc spring group has at least one disc spring. When a small disc spring group has two or more disc springs, all the disc springs in the same small disc spring group are stacked; the second adjustment mechanism is configured to be able to adjust the number of combined disc springs that establish a force transmission path with the pedal assembly.

[0015] Further, a slidable connecting block is hinged to the rocker arm, and another connecting block and the outer sleeve are integrally arranged and are jointly hinged to the tractor; the second adjusting mechanism includes a plurality of sliding rings, a plurality of annular chambers and a plurality of piston rings. The sliding rings can slide along the axial direction of the outer sleeve. The diameters of the plurality of sliding rings are different and are respectively inserted into different inner cylinders and can form a stop fit with different large groups of disc springs; the diameters of the plurality of annular chambers are different and are coaxially arranged on the slidable connecting block; the piston rings can slide along the axial direction of the outer sleeve. The diameters of the plurality of piston rings are different and are respectively inserted into different annular chambers and can respectively form a stop fit with different sliding rings.

[0016] Further, the second adjusting mechanism further includes a driving component configured to provide a driving force for the sliding of the piston rings.

[0017] Further, the small ends of the disc springs of the disc spring group or the small disc spring group closest to the tractor are arranged towards the pedal assembly.

[0018] The beneficial effects of the present invention are as follows:

[0019] During the use of a tractor clutch boosting device provided by the present invention, when the pedal assembly is depressed, the pedal assembly drives the rocker arm to rotate together around the fixed shaft, and the rocker arm synchronously drives the tractor clutch boosting device to rotate around the axis of the fixed shaft; when the tractor clutch boosting device rotates, the combined disc springs inside it are first compressed and shortened until the tractor clutch boosting device and the rocker arm are collinear, and then gradually elongate under their own elastic action and assist the downward movement of the pedal assembly; during the deformation process of the combined disc springs, their stiffness can adaptively change, which enables it to be highly matched with the clutch separation characteristics and the clutch operation movement characteristics during the boosting process. This high matching not only effectively improves the problem of inconvenient clutch operation, but also greatly improves the operation comfort, and at the same time significantly improves the use performance of the tractor clutch boosting device.

[0020] Further, by setting the first adjusting mechanism or the second adjusting mechanism, during use, the boosting degree of the combined disc springs can be adaptively adjusted according to different engagement loads of the clutch, so as to be able to adapt to the complex working conditions of the tractor and improve the applicability of the tractor clutch boosting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic three-dimensional structure diagram of a tractor clutch boosting device provided by the first embodiment of the present invention;

[0022] Figure 2 is a schematic three-dimensional structure diagram of the tractor clutch boosting device provided by the first embodiment of the present invention assembled between the tractor and the pedal assembly;

[0023] Figure 3 Schematic diagram of the load deformation of the disc spring provided by the first embodiment of the present invention;

[0024] Figure 4 Schematic three-dimensional structure diagram of the tractor clutch booster device provided by the second embodiment of the present invention assembled between the tractor and the clutch;

[0025] Figure 5 Schematic cross-sectional structure diagram of the tractor clutch booster device provided by the second embodiment of the present invention assembled between the tractor and the clutch;

[0026] Figure 6 Schematic three-dimensional structure diagram of the tractor clutch booster device provided by the second embodiment of the present invention;

[0027] Figure 7 Schematic cross-sectional structure diagram of the tractor clutch booster device provided by the second embodiment of the present invention; Figure 1 ;

[0028] Figure 8 Schematic cross-sectional structure diagram of the tractor clutch booster device provided by the second embodiment of the present invention; Figure 2 ;

[0029] Figure 9 Schematic cross-sectional structure diagram of the tractor clutch booster device provided by the second embodiment of the present invention; Figure 3 ;

[0030] Figure 10 Schematic cross-sectional structure diagram of the tractor clutch booster device provided by the second embodiment of the present invention; Figure 4 ;

[0031] Figure 11 Schematic three-dimensional structure diagram of the tractor clutch booster device provided by the third embodiment of the present invention;

[0032] Figure 12 Schematic cross-sectional structure diagram of the tractor clutch booster device provided by the third embodiment of the present invention.

[0033] Wherein:

[0034] 1. Upper connecting block; 2. Disc spring; 3. Sliding support; 4. Flat key; 5. Intermediate spacer sleeve; 6. Guide positioning core; 7. Outer sleeve; 8. Lower connecting block; 9. Fixed seat; 10. First pin shaft; 11. Tractor clutch boosting device; 12. Second pin shaft; 13. Rocker arm; 14. Fixed shaft; 15. Pedal assembly; 16. Fixed sleeve; 17. End cover; 1801. Spiral sleeve; 1802. First connecting column; 1803. Second connecting column; 1804. Force transmission member; 19. Inner cylinder; 20. Second adjusting mechanism; 2001. Sliding ring; 2002. Annular chamber; 2003. Piston ring; 21. Driving assembly; 2101. Oil pump; 22. Base; 23. Swing arm; 24. Connecting shaft; 25. Connecting sleeve; 26. Chuck; 27. Pull rod; 28. Guide seat; 29. Nut; 30. Guide rod; 31. Positioning sleeve. Detailed implementation manners

[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments in combination with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The terms "connection" and "coupling" as used herein, unless otherwise clearly defined and limited, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0037] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0038] Such as Figures 1 to 3As shown in the figure, the tractor clutch booster device 11 provided by the first embodiment of the present invention is applied to a tractor, which includes a fixed shaft 14, a pedal assembly 15 and a rocker arm 13. The fixed shaft 14 is arranged on the tractor; the pedal assembly 15 is hinged on the fixed shaft 14; the rocker arm 13 is hinged on the fixed shaft 14 and fixedly connected to the pedal assembly 15; the tractor clutch booster device 11 is provided to include an outer sleeve 7, a combined disc spring and two connecting blocks. The axis of the outer sleeve 7 is perpendicular to the axis of the fixed shaft 14; the combined disc spring is coaxially inserted into the outer sleeve 7; the two connecting blocks are inserted into the outer sleeve 7 and are respectively located at both ends of the combined disc spring, and both form a stop fit with the combined disc spring. One of the connecting blocks is connected to the rocker arm 13 and can slide along the axis direction of the outer sleeve 7, and the other connecting block is connected to the tractor.

[0039] Specifically in this embodiment, the pedal assembly 15 is provided to include a swing arm and a pedal. As Figure 2 shown, the swing arm is arranged in an L-shaped structure. The left end of the swing arm is hinged on the fixed shaft 14, and the right end is fixedly connected to the pedal. The pedal is arranged in the cockpit for the driver to step on conveniently; the left end of the rocker arm 13 is hinged on the upper connecting block, and the right end is hinged on the fixed shaft 14; to facilitate the fixed connection between the pedal assembly 15 and the rocker arm 13, the tractor is also provided with a fixed sleeve 16. When installed, the fixed sleeve 16 is rotatably sleeved on the fixed shaft 14. The rocker arm 13 and the swing arm are both fixedly connected to the outer peripheral wall of the fixed sleeve 16 and form an inverted V-shaped structure to ensure that the rocker arm 13 can synchronously follow the pedal assembly 15 to rotate around the axis of the fixed shaft 14.

[0040] To facilitate the distinction between the two connecting blocks, the connecting block close to the rocker arm 13 is named the upper connecting block 1, and the connecting block far from the rocker arm 13 is named the lower connecting block 8; as Figure 1 shown, the upper connecting block 1 is inserted into the top of the outer sleeve 7 and can slide along the axis of the outer sleeve 7; the lower connecting block 8 is inserted into the bottom of the outer sleeve 7 and is fixedly connected to the outer sleeve 7.

[0041] Further, the combined disc spring is provided with a plurality of disc spring groups. The plurality of disc spring groups are arranged along the axis of the outer sleeve 7, and adjacent disc spring groups are arranged in an opposing manner. Each disc spring group has at least one disc spring 2. When the disc spring group has two or more disc springs 2, all the disc springs 2 in the same disc spring group are stacked; the two connecting blocks are respectively hinged on the rocker arm 13 and the tractor.

[0042] Specifically, as Figure 1As shown, the number of disc spring groups is set to six. Each disc spring group has a disc spring 2. The six disc springs 2 are coaxially inserted into the outer sleeve 7, and the small ends or large ends of adjacent disc springs 2 are arranged opposite to each other. While ensuring that adjacent disc springs 2 can form a butted form, the six disc springs 2 can deform synchronously along the axial direction of the outer sleeve 7. To facilitate the connection of the lower connecting block 8, the tractor is also provided with a fixed seat 9. The fixed seat 9 and the pedal assembly 15 are respectively located on both sides of the fixed shaft 14. The tractor clutch booster device 11 is also provided with a first pin shaft 10. When installed, the lower connecting block 8 is hingedly connected to the fixed seat 9 through the first pin shaft 10, and a fixed hinge point Ⅰ is formed. The upper connecting block 1 and the rocker arm 13 are hingedly connected. To facilitate the hinged connection between the upper connecting block 1 and the rocker arm 13, the tractor clutch booster device 11 is also provided with a second pin shaft 12. When installed, the upper connecting block 1 is hingedly connected to the rocker arm 13 through the second pin shaft 12, and a rotating hinge point Ⅱ is formed.

[0043] Optionally, the fixed seat 9 can be set to a U-shaped structure, which reduces the material used while ensuring that the lower connecting block 8 can be hinged at the notch of the fixed seat 9.

[0044] Optionally, to facilitate the guiding and centering of the combined disc springs, the tractor clutch booster device 11 is also provided with a guiding and positioning core 6. As Figure 1 shown, the guiding and positioning core 6 is a columnar structure and is coaxially inserted into the outer sleeve 7. The top end of the guiding and positioning core 6 is suspended, and the bottom end is fixedly connected to the top of the lower connecting block 8. When installed, the disc spring 2 is slidably sleeved on the guiding and positioning core 6 to ensure that the disc spring 2 can move axially along the guiding and positioning core 6.

[0045] Optionally, to facilitate improving the shape stability of the disc spring 2, the tractor clutch booster device 11 is also provided with a sliding support 3, an intermediate spacer 5 and a flat key 4. The sliding support 3 is slidably sleeved on the guiding and positioning core 6 and is located between adjacent disc springs 2 with their small ends opposite, ensuring that the sliding support 3 can play a guiding and supporting role when the disc spring 2 moves axially, enabling the combined disc springs to perform actions such as elongation and compression according to the design requirements, and ensuring the normal operation of the tractor clutch booster device 11. The intermediate spacer 5 is coaxially inserted into the outer sleeve 7 and is located between adjacent disc springs 2 with their large ends opposite. The flat key 4 is fixedly inserted into the intermediate spacer 5 and slidably inserted into the guiding and positioning core 6 at the same time, enabling the intermediate spacer 5 to slide axially along the guiding and positioning core 6, ensuring the positioning accuracy and stability of the combined disc springs during the movement process, and further enabling the combined disc springs to accurately provide assistance.

[0046] Initially, as Figure 3 shown, the designed initial working position (pedal initial position) of the disc spring 2 is near the flattening point λO, so that the reverse force (resistance) provided by the disc spring 2 to the pedal assembly 15 at the initial position is Fo.

[0047] When stepping on the pedal downward, as Figure 2 shown, the pedal drives the rocker arm 13 to rotate clockwise around the axis of the fixed shaft 14 through the swing arm; the rocker arm 13 drives the whole tractor clutch boosting device 11 to rotate counterclockwise around the fixed hinge point I through the hinged connection with the upper connecting block 1. The rocker arm 13 drives the upper connecting block 1 to gradually penetrate into the outer sleeve 7 inward, so that the combined disc spring is compressed and shortened. And when the tractor clutch boosting device 11 rotates to a line formed by the fixed hinge point I, the rotating hinge point II and the center of the fixed shaft 14, the combined disc spring is compressed to the shortest. Due to the load deformation curve characteristics of the disc spring 2, as the combined disc spring is compressed, the single disc spring 2 is gradually deformed to the valley point λa and the load gradually becomes smaller, that is, the reverse force (resistance) provided by the tractor clutch boosting device 11 to the pedal assembly 15 during the rotation process is decreasing. And when the single disc spring 2 is deformed to λa, the reverse force (resistance) provided by the disc spring 2 to the pedal assembly 15 is Fa, and Fa < Fo.

[0048] As the pedal continues to move downward, the rocker arm 13 drives the upper connecting block 1 to gradually pull out of the outer sleeve 7 outward. The combined disc spring gradually releases under its own elastic action. The single disc spring 2 is gradually deformed to the peak point λb and the load gradually increases, that is, the forward force (boosting force) provided by the tractor clutch boosting device 11 to the pedal assembly 15 during the rotation process is increasing. And when the single disc spring 2 is deformed to λb, the forward force (boosting force) provided by the disc spring 2 to the pedal assembly 15 is Fb, and Fb > Fo, so as to be able to offset the force exerted by the clutch on the pedal assembly 15. And the boosting process of the combined disc spring coincides with the clutch separation characteristics, so as to achieve the best boosting effect.

[0049] There are still some problems in the existing spring mechanical boosting mechanism during use: during the operation of the tractor, the working conditions are extremely complex, and the working environment, load conditions, etc. it faces change constantly, which directly leads to the dynamic change of the engagement difficulty of the clutch. The existing spring mechanical boosting mechanism does not have an adjustment function, resulting in the inability to adapt to the engagement requirements of the clutch; to meet this development requirement, as Figures 4 to 10As shown in the figure, the tractor clutch boosting device 11 provided by the second embodiment of the present invention is applied to a tractor, which includes a fixed shaft 14, a pedal assembly 15 and a rocker arm 13. The fixed shaft 14 is arranged on the tractor; the pedal assembly 15 is hinged on the fixed shaft 14; the rocker arm 13 is hinged on the fixed shaft 14 and fixedly connected to the pedal assembly 15. The tractor clutch boosting device 11 includes an outer sleeve 7, a combined disc spring and two connecting blocks. The axis of the outer sleeve 7 is perpendicular to the axis of the fixed shaft 14; the combined disc spring is coaxially inserted into the outer sleeve 7; the two connecting blocks are inserted into the outer sleeve 7 and are respectively located on both sides of the combined disc spring, and both form a stop fit with the combined disc spring. One of the connecting blocks is connected to the rocker arm 13 and can slide along the axis direction of the outer sleeve 7, and the other connecting block is connected to the tractor.

[0050] Specifically in this embodiment, to facilitate the installation of the fixed shaft 14, the tractor is further provided with a base 22, as Figure 4 shown, when installed, the fixed shaft 14 is horizontally inserted into the base 22 and extends in the front-rear direction; the pedal assembly 15 is provided with a rotating arm and a pedal. The rotating arm is set in an L-shaped structure. The left end of the rotating arm is hinged on the fixed shaft 14, and the right end is fixedly connected to the pedal. The pedal is arranged in the cockpit for the driver to step on conveniently; the right end of the rocker arm 13 is hinged on the fixed shaft 14 and can be fixed to the rotating arm by welding to ensure that the rocker arm 13 can rotate synchronously with the pedal assembly 15 around the axis of the fixed shaft 14.

[0051] To facilitate the connection of the clutch, the tractor is further provided with a swing arm 23, a connecting shaft 24, a connecting sleeve 25, a chuck 26, a pull rod 27 and a guide seat 28, as Figure 4 and Figure 5 shown, Figure 5 the left side in Figure 4 is the right end in Figure 5 and the right side in Figure 4At the left end of [description], the right end of the swing arm 23 is rotatably sleeved on the fixed shaft 14, and the left end is suspended; the connecting shaft 24 extends horizontally in the front-rear direction, and the rear end is vertically and fixedly inserted on the swing arm 23, and the front end is vertically and fixedly inserted on the rocker arm 13; the connecting sleeve 25 is rotatably sleeved on the connecting shaft 24; the chuck 26 is arranged in a U-shaped structure, and the open end faces the connecting sleeve 25 and is hinged on the connecting sleeve 25; the pull rod 27 extends horizontally in the left-right direction, and the right end is inserted on the chuck 26, and the left end is connected to the clutch; the guide seat 28 is fixedly arranged on the upper part of the base 22 and is sleeved on the pull rod 27 to ensure that the pull rod 27 can only slide in the left-right direction; to facilitate adapting to the clutch clearance that appears when the clutch wears, an external thread is provided on the circumferential side wall of the right end of the pull rod 27, and the tractor is further provided with a nut 29. The nut 29 is arranged on the chuck 26 and can rotate around its own axis and is threadedly sleeved on the pull rod 27 to ensure that when the clutch wears, the pull rod 27 can be moved towards the clutch direction by rotating the nut 29, thereby reducing the clutch clearance.

[0052] The number of the outer sleeves 7 is two or more, and a combined disc spring and two connecting blocks are inserted in each outer sleeve 7; each combined disc spring has a plurality of disc spring groups, and the adjacent disc spring groups of the same combined disc spring are arranged in an opposed manner; each disc spring group has at least one disc spring 2. When the disc spring group has two or more disc springs 2, all the disc springs 2 of the same disc spring group are stacked; the tractor clutch boosting device 11 further includes a first adjusting mechanism and two end covers 17. The two end covers 17 are respectively hinged on the rocker arm 13 and the tractor and are respectively connected to the two connecting blocks; the first adjusting mechanism is configured to be able to adjust the number of the combined disc springs that establish a force transmission path with the pedal assembly 15.

[0053] Specifically, taking the number of the outer sleeves 7 being set to three as an example, as Figure 6 shown, the axes of the three outer sleeves 7 are parallel to each other, and the three outer sleeves 7 are arranged in an equilateral triangle; as Figure 8 shown, the combined disc spring in one of the outer sleeves 7 has six disc spring groups, and the six disc spring groups are arranged along the axis of the outer sleeve 7. The small ends of the adjacent disc spring groups are arranged opposite to each other or the large ends are arranged opposite to each other to ensure an opposed form. Each disc spring group has three disc springs 2, and the small ends of the three disc springs 2 of the same disc spring group all face the same direction to ensure a stacked form; as Figure 9 shown, the combined disc spring in one of the outer sleeves 7 has six disc spring groups, and the six disc spring groups are arranged along the axis of the outer sleeve 7. The small ends of the adjacent disc spring groups are arranged opposite to each other or the large ends are arranged opposite to each other to ensure an opposed form. Each disc spring group has one disc spring 2; as Figure 10As shown, the combined disc springs within the last outer sleeve 7 have six disc spring groups. The six disc spring groups are arranged along the axis of the outer sleeve 7. The small ends of adjacent disc spring groups are arranged opposite to each other or the large ends are arranged opposite to each other to ensure a butted form. Each disc spring group has two disc springs 2. The small ends of the two disc springs 2 in the same disc spring group all face the same direction to ensure a stacked form.

[0054] Since the load presented by the combined disc spring is the elastic force of a single disc spring 2 multiplied by the number of disc springs 2 in the disc spring group, therefore, when the deformation degree is the same, the elastic force shown by the combined disc spring with three stacked disc springs 2 in the disc spring group is greater than the elastic force shown by the combined disc spring with two stacked disc springs 2 in the disc spring group. The elastic force shown by the combined disc spring with two stacked disc springs 2 in the disc spring group is greater than the elastic force shown by the combined disc spring with one disc spring 2 in the disc spring group. Thus, during use, a force transmission path can be established between any one or any multiple combined disc springs and the pedal assembly 15 according to requirements.

[0055] Among them, when establishing a force transmission path between a single combined disc spring and the pedal assembly 15, it is set as the first gear. And the combined disc spring with three stacked disc springs 2 in the disc spring group is the maximum gear in the first gear, with the maximum elastic force. The combined disc spring with two stacked disc springs 2 in the disc spring group is the intermediate gear in the first gear, with a moderate elastic force. The combined disc spring with one disc spring 2 in the disc spring group is the minimum gear in the first gear, with the minimum elastic force. When establishing a force transmission path between two combined disc springs and the pedal assembly 15, it is set as the second gear. And the combination of the combined disc spring with three stacked disc springs 2 in the disc spring group and the combined disc spring with two stacked disc springs 2 in the disc spring group is the maximum gear in the second gear, with the maximum elastic force. The combination of the combined disc spring with three stacked disc springs 2 in the disc spring group and the combined disc spring with one disc spring 2 in the disc spring group is the intermediate gear in the second gear, with a moderate elastic force. The combination of the combined disc spring with two stacked disc springs 2 in the disc spring group and the combined disc spring with one disc spring 2 in the disc spring group is the minimum gear in the second gear, with the minimum elastic force. When establishing a force transmission path between three combined disc springs and the pedal assembly 15, it is set as the third gear. And the third gear is the combination of the combined disc spring with three stacked disc springs 2 in the disc spring group, the combined disc spring with two stacked disc springs 2 in the disc spring group, and the combined disc spring with one disc spring 2 in the disc spring group.

[0056] Optionally, a sliding support 3 is provided between adjacent disc springs 2 with opposite small ends; an intermediate spacer sleeve 5 is provided between adjacent disc springs 2 with opposite large ends.

[0057] Two end caps 17 are respectively arranged at both ends of the outer sleeve 7; for facilitating the connection between the end cap 17 and the outer sleeve 7, the tractor clutch boosting device 11 is further provided with three guide rods 30 and two positioning sleeves 31, as Figure 6As shown, the guide rods 30 extend along the direction parallel to the axis of the outer sleeve 7, and their upper ends are all slidably inserted into the upper end cap 17, and their lower ends are all fixedly inserted into the lower end cap 17. The three guide rods 30 are evenly arranged circumferentially on the outer periphery of the three outer sleeves 7; the positioning sleeves 31 are simultaneously fixedly sleeved on the three outer sleeves 7 and simultaneously fixedly sleeved on the three guide rods 30. The two positioning sleeves 31 are arranged at intervals along the axis of the outer sleeve 7.

[0058] Further, the first adjusting mechanism is provided to include a plurality of screw sleeves 1801 and a plurality of first connecting columns 1802. The screw sleeves 1801 are arranged on the end cap 17 and can rotate around their own axes; the first connecting columns 1802 are threadedly inserted into the screw sleeves 1801. One end of the first connecting column 1802 is inserted into the slidable connecting block and can form a stop fit with the slidable connecting block.

[0059] Specifically, as Figure 8 shown, the axis of the screw sleeve 1801 coincides with the axis of the outer sleeve 7 and is inserted through the upper end cap 17; the upper end of the first connecting column 1802 is threadedly inserted into the screw sleeve 1801, and the lower end is inserted into the upper connecting block 1.

[0060] Optionally, to prevent the first connecting column 1802 and the screw sleeve 1801 from rotating synchronously, the first adjusting mechanism is provided to include a chute and a sliding protrusion. The chute is arranged on the circumferential side wall of the first connecting column 1802 and extends along the axis direction of the first connecting column 1802. The sliding protrusion is arranged on the upper connecting block 1, and the sliding protrusion is slidably inserted into the chute during installation; or the chute is arranged on the upper connecting block 1, the sliding protrusion is arranged on the circumferential side wall of the first connecting column 1802, and the sliding protrusion is slidably inserted into the chute during installation, ensuring that the first connecting column 1802 does not rotate when the screw sleeve 1801 rotates, and can drive the first connecting column 1802 to move through the threaded fit with the first connecting column 1802.

[0061] During use, the driver can rotate the corresponding screw sleeve 1801 in the first gear according to his own foot feeling (light or heavy). When the driver's foot feeling is light, he can choose to rotate the screw sleeve 1801 corresponding to the disc spring group with one disc spring 2. When the screw sleeve 1801 rotates, it drives the first connecting column 1802 to move downward until it forms a stop fit with the upper connecting block 1, so that the pedal assembly 15 can establish a force transmission path through the rocker arm 13, end cover 17, screw sleeve 1801, first connecting column 1802, upper connecting block 1 and the combined disc spring of the disc spring group with one disc spring 2. Since the elastic force presented by the combined disc spring of the disc spring group with one disc spring 2 is the smallest in the first gear, it can adapt to the driver's light foot feeling; similarly, when the driver's foot feeling is heavy, he can choose to rotate the screw sleeve 1801 corresponding to the disc spring group with three disc springs 2. When the screw sleeve 1801 rotates, it drives the first connecting column 1802 to move downward until it forms a stop fit with the upper connecting block 1, so that the pedal assembly 15 can establish a force transmission path through the rocker arm 13, end cover 17, screw sleeve 1801, first connecting column 1802, upper connecting block 1 and the combined disc spring with three disc springs 2 stacked in the disc spring group. Since the elastic force presented by the combined disc spring with three disc springs 2 stacked in the disc spring group is the largest in the first gear, it can adapt to the driver's heavy foot feeling.

[0062] Subsequently, when the engagement difficulty (torque) of the clutch increases, the corresponding screw sleeve 1801 can be rotated electrically to switch to different gears, so that the boosting situation of the tractor clutch boosting device 11 can be adapted to the engagement difficulty of the clutch.

[0063] In addition, when the engagement difficulty (torque) of the clutch changes to a lower level, the corresponding screw sleeve 1801 can be rotated electrically to switch to the gear initially set by the driver to adapt to the driver's foot feeling; the corresponding screw sleeve 1801 can also be rotated electrically to switch to the lowest gear in the first gear, that is, the combined disc spring of the disc spring group with one disc spring 2 and the pedal assembly 15 establish a force transmission path, so as to ensure the average use of each gear and improve the service life of the tractor clutch boosting device 11.

[0064] Specifically, to facilitate sensing the engagement difficulty of the clutch, the tractor clutch boosting device 11 is further provided with a torque sensor. The torque sensor is arranged at the clutch to facilitate real-time sensing of the torque change of the clutch; to facilitate electrically controlling the rotation of the screw sleeve 1801, the tractor clutch boosting device 11 is further provided with a plurality of drive motors, a plurality of first gears and a plurality of second gears. The drive motors are arranged on the end cover 17 at the upper end and are correspondingly arranged with the screw sleeve 1801. The first gears are fixedly sleeved on the motor shafts of the drive motors, and the second gears are fixedly sleeved on the screw sleeve 1801 and are meshed with the first gears.

[0065] In use, the drive motor is started, and the drive motor drives the first gear to rotate. The first gear drives the screw sleeve 1801 to rotate through meshing with the second gear. When the screw sleeve 1801 rotates, it drives the first connecting column 1802 to move downward through the thread fit with the first connecting column 1802, so that the first connecting column 1802 and the upper connecting block 1 form a stop fit, and then a force transmission path can be established between the combined disc spring and the pedal assembly 15.

[0066] Further, the first adjusting mechanism is further configured to include a plurality of second connecting columns 1803 and a plurality of force transmission members 1804. The second connecting columns 1803 are threadedly inserted into the screw sleeve 1801, and one end of the second connecting column 1803 is fixedly arranged on the force transmission member 1804; the force transmission member 1804 can form a stop fit with at least two slidable connecting blocks located at the same end inside different outer sleeves 7.

[0067] Specifically, as Figure 7 shown, the number of the force transmission members 1804 can be set to three, and two of the force transmission members 1804 are strip-shaped structures, and the other force transmission member 1804 is a Y-shaped structure. One end of one strip-shaped force transmission member 1804 is respectively sleeved on the upper connecting block 1 corresponding to the combined disc spring with three disc springs 2 stacked in the disc spring group and the upper connecting block 1 corresponding to the combined disc spring with two disc springs 2 stacked in the disc spring group, ensuring that the maximum gear in the second gear can be switched through the force transmission member 1804. One end of the other strip-shaped force transmission member 1804 is respectively sleeved on the upper connecting block 1 corresponding to the combined disc spring with three disc springs 2 stacked in the disc spring group and the upper connecting block 1 corresponding to the combined disc spring with one disc spring 2 in the disc spring group, ensuring that the middle gear in the second gear can be switched through the force transmission member 1804; the Y-shaped force transmission member 1804 is simultaneously sleeved on the upper connecting block 1 corresponding to the combined disc spring with three disc springs 2 stacked in the disc spring group, the upper connecting block 1 corresponding to the combined disc spring with two disc springs 2 stacked in the disc spring group, and the upper connecting block 1 corresponding to the combined disc spring with one disc spring 2 in the disc spring group, ensuring that the third gear can be switched through the force transmission member 1804.

[0068] Correspondingly, the number of the second connecting columns 1803 is three, and they are respectively vertically and fixedly arranged on the tops of the three force transmission members 1804. One ends of the three second connecting columns 1803 away from the force transmission members 1804 are respectively threadedly inserted into the screw sleeve 1801.

[0069] The reason for not arranging the force transmission member 1804 on the upper connecting block 1 corresponding to the combined disc spring with two disc springs 2 stacked in the disc spring group and the upper connecting block 1 corresponding to the combined disc spring with one disc spring 2 in the disc spring group is that the minimum gear in the second gear may have the same boosting effect as the maximum gear in the first gear. In order to ensure the rationality of the structure, it is not arranged.

[0070] During use, when it is necessary to switch to the third gear, first adjust all the screw sleeves 1801 to be in their original positions, that is, all the first connecting columns 1802 are detached and matched with the upper connecting block 1, and then drive the screw sleeve 1801 corresponding to the Y-shaped force transmission member 1804 to rotate, and the screw sleeve 1801 drives the second connecting column 1803 together with the Y-shaped force transmission member 1804 to synchronously approach the upper connecting block 1 through the threaded cooperation with the second connecting column 1803, until the Y-shaped force transmission member 1804 and the upper connecting block 1 form a stop cooperation; when it is necessary to switch to the middle gear in the second gear or the maximum gear in the second gear, the operation process is similar and will not be repeated.

[0071] By setting the force transmission member 1804, when any two or three combined disc springs are linked, the elastic force generated can be first concentrated on the force transmission member 1804, and then transmitted to the pedal assembly 15 through the upper connecting block 1, the first connecting column 1802 / the second connecting column 1803, the screw sleeve 1801, the end cover 17, and the rocker arm 13, avoiding direct transmission between the first connecting column 1802 and the screw sleeve 1801, and between the second connecting column 1803 and the screw sleeve 1801, resulting in increased wear of the first connecting column 1802 and the screw sleeve 1801, and between the second connecting column 1803 and the screw sleeve 1801, thereby affecting the transmission stability between the first connecting column 1802 and the screw sleeve 1801, and between the second connecting column 1803 and the screw sleeve 1801.

[0072] In other embodiments, both connecting blocks are configured to slide along the axis direction of the outer sleeve 7; there are two first adjustment mechanisms, which are respectively arranged between the connecting block and the end cover 17. Such a configuration can greatly improve the flexibility and accuracy of the adjustment. Since both connecting blocks can slide, the force at both ends of the combined disc spring can be adjusted independently during operation, and the preload and assist characteristics of the combined disc spring can be specifically adjusted according to the actual load difference on both sides of the clutch.

[0073] In view of the fact that the existing spring mechanical booster mechanism has no adjustment function and cannot adapt to the clutch engagement requirements, such as Figures 11 to 12As shown in the figure, the tractor clutch boosting device 11 provided in the third embodiment of the present invention is configured to include a second adjustment mechanism 20 and a plurality of inner cylinders 19. The diameters of the plurality of inner cylinders 19 are different, and the plurality of inner cylinders 19 are coaxially inserted into the outer sleeve 7; the combined disc spring has a plurality of large disc spring groups, the diameters of the plurality of large disc spring groups are different, and they are respectively coaxially inserted into different inner cylinders 19; each large disc spring group has a plurality of small disc spring groups, and the plurality of small disc spring groups of the same large disc spring group are arranged along the axis of the outer sleeve 7, and the adjacent small disc spring groups of the same large disc spring group are arranged in an opposed manner; each small disc spring group has at least one disc spring 2. When the small disc spring group has two or more disc springs 2, all the disc springs 2 of the same small disc spring group are stacked; the second adjustment mechanism 20 is configured to be able to adjust the number of combined disc springs that establish a force transmission path with the pedal assembly 15.

[0074] Specifically in this embodiment, as Figure 12 shown, the number of inner cylinders 19 is set to three, and they are coaxially inserted into the outer sleeve 7; the combined disc spring is set to have three large disc spring groups, each large disc spring group has eight small disc spring groups, each small disc spring group has one disc spring 2, the eight disc springs 2 of the same large disc spring group are arranged along the axis of the outer sleeve 7, and the small ends or large ends of the adjacent disc springs 2 of the same large disc spring group are arranged opposite to each other to ensure an opposed form, and the diameters of the disc springs 2 of different large disc spring groups increase in sequence and are respectively inserted into the three inner cylinders 19; the number of guide rods 30 is set to four, and the four guide rods 30 are evenly arranged circumferentially on the outer periphery of the outer sleeve 7. The top ends of the guide rods 30 are slidably inserted into the upper connection block 1, and the lower ends are fixed to the lower connection block 8 to ensure the sliding of the upper connection block 1 can be guided.

[0075] Since the spring constant of the disc spring 2 has a positive correlation with its own diameter, therefore, under the condition of the same deformation degree, the larger the diameter of the disc spring 2, the greater the elastic force, so that the elastic force exhibited by the corresponding combined disc spring is greater. Thus, during use, a force transmission path can be established between any one or any plurality of combined disc springs and the pedal assembly 15 according to requirements.

[0076] Among them, when establishing a force transmission path between a single combined disc spring and the pedal assembly 15, it is set to the first gear, and the combined disc spring with the disc spring 2 having the largest diameter is the largest gear in the first gear, with the largest elastic force; the combined disc spring with the disc spring 2 having a medium diameter is the middle gear in the first gear, with a moderate elastic force; the combined disc spring with the disc spring 2 having the smallest diameter is the smallest gear in the first gear, with the smallest elastic force; when establishing a force transmission path between two combined disc springs and the pedal assembly 15, it is set to the second gear, and the combination of the combined disc spring with the largest diameter of the disc spring 2 and the combined disc spring with the disc spring 2 having a medium diameter is the largest gear in the second gear, with the largest elastic force; the combination of the combined disc spring with the largest diameter of the disc spring 2 and the combined disc spring with the disc spring 2 having the smallest diameter is the middle gear in the second gear, with a moderate elastic force; the combination of the combined disc spring with the disc spring 2 having a medium diameter and the combined disc spring with the disc spring 2 having the smallest diameter is the smallest gear in the second gear, with the smallest elastic force; when establishing a force transmission path between three combined disc springs and the pedal assembly 15, it is set to the third gear, and the third gear is the combination of the combined disc spring with the largest diameter of the disc spring 2, the combined disc spring with the disc spring 2 having a medium diameter, and the combined disc spring with the disc spring 2 having the smallest diameter.

[0077] Optionally, a sliding support 3 is arranged between adjacent disc springs 2 with opposite small ends; an intermediate spacer sleeve 5 is arranged between adjacent disc springs 2 with opposite large ends.

[0078] Further, a slidable connecting block is hinged on the rocker arm 13, and another connecting block is integrally arranged with the outer sleeve 7 and is jointly hinged on the tractor; the second adjusting mechanism 20 is set to include a plurality of sliding rings 2001, a plurality of annular chambers 2002, and a plurality of piston rings 2003. The sliding rings 2001 can slide along the axial direction of the outer sleeve 7. The diameters of the plurality of sliding rings 2001 are different and are respectively inserted into different inner cylinders 19 and can form a stop fit with different large disc spring groups; the diameters of the plurality of annular chambers 2002 are different and are coaxially opened on the slidable connecting block; the piston rings 2003 can slide along the axial direction of the outer sleeve 7. The diameters of the plurality of piston rings 2003 are different and are respectively inserted into different annular chambers 2002 and can respectively form a stop fit with different sliding rings 2001.

[0079] Specifically, as Figure 12As shown in the figure, the upper connecting block 1 is a slidable connecting block and is hinged to the rocker arm 13. The lower connecting block 8 and the outer sleeve 7 are integrally arranged and are jointly hinged to the fixed seat 9. The number of sliding rings 2001 is three, and the diameters of the three sliding rings 2001 increase in sequence. The three sliding rings 2001 are respectively slidably inserted into the three inner cylinders 19 to ensure that a stop fit can be formed with the large group of disc springs. The number of annular chambers 2002 is three, and the diameters of the three annular chambers 2002 increase in sequence. The three annular chambers 2002 are coaxially arranged in the upper connecting block 1. The number of piston rings 2003 is three, and the diameters of the three piston rings 2003 increase in sequence. The three piston rings 2003 are respectively slidably inserted into the three annular chambers 2002. The lower end of the piston ring 2003 penetrates through the annular chamber 2002 to ensure that a stop fit can be formed with the sliding ring 2001.

[0080] During use, the driver can move the corresponding piston ring 2003 in the first gear according to his own foot feeling (light or heavy). When the driver's foot feeling is light, he can choose to move the piston ring 2003 corresponding to the disc spring 2 with the smallest diameter. The piston ring 2003 moves downward to form a stop fit with the sliding ring 2001, so that the pedal assembly 15 can establish a force transmission path through the rocker arm 13, the upper connecting block 1, the piston ring 2003, the sliding ring 2001 and the combined disc spring of the disc spring 2 with the smallest diameter in sequence. Since the elastic force presented by the combined disc spring of the disc spring 2 with the smallest diameter is the smallest in the first gear, it can adapt to the driver's light foot feeling. Similarly, when the driver's foot feeling is heavy, he can choose to move the piston ring 2003 corresponding to the disc spring 2 with the largest diameter. The operation process is similar and will not be repeated here.

[0081] Subsequently, when the engagement difficulty (torque) of the clutch increases, the corresponding piston ring 2003 can be moved by an electric control method to switch to different gears, so that the boosting situation of the tractor clutch boosting device 11 can be adapted to the engagement difficulty of the clutch.

[0082] In addition, when the engagement difficulty (torque) of the clutch changes to a lower level, the corresponding piston ring 2003 can be moved by an electric control method to switch to the gear initially set by the driver to adapt to the driver's foot feeling; or the corresponding piston ring 2003 can be moved by an electric control method to switch to the lowest gear in the first gear, that is, the combined disc spring of the disc spring 2 with the smallest diameter and the pedal assembly 15 establish a force transmission path, so as to ensure the average use of each gear and improve the service life of the tractor clutch boosting device 11.

[0083] Furthermore, the second adjusting mechanism 20 further includes a driving assembly 21, and the driving assembly 21 is configured to be able to provide the driving force for the sliding of the piston ring 2003.

[0084] Specifically, the driving component 21 is set to include a hydraulic oil tank, three oil pumps 2101 and six oil pipes. The hydraulic oil tank is arranged inside the tractor and filled with hydraulic oil; as Figure 11 and Figure 12 shown, the three oil pumps 2101 are all arranged on the top of the upper connecting block 1. One end of each of the three oil pumps 2101 is communicated with the hydraulic oil tank through an oil pipe, and the other end is respectively communicated with the three annular chambers 2002 through an oil pipe.

[0085] During use, start the oil pump 2101. The oil pump 2101 pumps the hydraulic oil in the hydraulic oil tank into the annular chamber 2002 through the oil pipe. After the hydraulic oil is pumped into the annular chamber 2002, it drives the piston ring 2003 to approach the sliding ring 2001 under the hydraulic action, so that the piston ring 2003 and the sliding ring 2001 form a stop fit, and further a force transmission path can be established between the combined disc spring and the pedal assembly 15.

[0086] In some other embodiments, it is set that the small end of the disc spring 2 closest to the disc spring group or disc spring sub-group of the tractor faces the pedal assembly 15.

[0087] Specifically, as Figure 1 shown, the large end of the lowermost disc spring 2 is arranged downward; as Figure 8 、 Figure 9 and Figure 10 shown, the large end of the lowermost disc spring 2 is arranged downward; as Figure 12 shown, the large end of the lowermost disc spring 2 is arranged downward. Thus, from the mechanical properties of the disc spring 2, the disc spring 2 bears an axial load during operation, and its large end has a larger bearing area. Therefore, when the large end of the disc spring 2 faces the direction of the load force, it can effectively disperse the load pressure and avoid premature damage or fatigue failure of the disc spring 2 caused by local stress concentration.

[0088] The technical features of the above embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

Claims

1. A tractor clutch boosting device, characterized in that, The tractor clutch booster device is applied to a tractor, which includes a fixed shaft, a pedal assembly, and a rocker arm. The fixed shaft is arranged on the tractor; the pedal assembly is hinged to the fixed shaft; the rocker arm is hinged to the fixed shaft and fixedly connected to the pedal assembly; the tractor clutch booster device includes an outer sleeve, a combined disc spring, two connecting blocks, and two end caps. The axis of the outer sleeve is perpendicular to the axis of the fixed shaft; the combined disc spring is coaxially inserted into the outer sleeve; the two connecting blocks are inserted into the outer sleeve and are respectively located at both ends of the combined disc spring, and both form a stop fit with the combined disc spring. The two end caps are respectively hinged to the rocker arm and the tractor and are respectively connected to the two connecting blocks corresponding to each outer sleeve. Among them, the connecting block close to the rocker arm side can slide along the axis direction of the outer sleeve; the number of outer sleeves is two or more, and each combined disc spring has multiple disc spring groups, and the adjacent disc spring groups of the same combined disc spring are arranged in an end-to-end manner; each disc spring group has at least one disc spring. When the disc spring group has two or more disc springs, all the disc springs of the same disc spring group are stacked; it also includes a first adjustment mechanism; the first adjustment mechanism is configured to be able to adjust the number of combined disc springs that establish a force transmission path with the pedal assembly. The first adjustment mechanism includes a plurality of screw sleeves and a plurality of first connecting columns. The screw sleeves are arranged on the end caps and can rotate around their own axes; the first connecting columns are threadedly inserted into the screw sleeves. One end of the first connecting column is inserted into the slidable connecting block and can form a stop fit with the slidable connecting block. Among them, the screw sleeve is configured such that the first connecting column does not rotate when the screw sleeve rotates, and can drive the first connecting column to move through the threaded fit with the first connecting column to form a stop fit with the connecting block. The first adjustment mechanism also includes a plurality of second connecting columns and a plurality of force transmission members. The second connecting columns are threadedly inserted into the screw sleeves on the end caps, and one end of the second connecting column is fixedly arranged on the force transmission member; the force transmission member can form a stop fit with at least two slidable connecting blocks located at the same end in different outer sleeves. The driver can rotate the corresponding screw sleeve to switch to different gears.

2. The tractor clutch boosting device according to claim 1, wherein, Both of the two connecting blocks can slide along the axis direction of the outer sleeve; the number of the first adjustment mechanisms is two, and the two first adjustment mechanisms are respectively arranged between the connecting block and the end cap.

3. The tractor clutch booster device according to claim 1, wherein The small ends of the disc springs of the disc spring group closest to the tractor are arranged facing the pedal assembly.

4. A tractor clutch booster device, characterized in that, The tractor clutch booster device is applied to a tractor, which includes a fixed shaft, a pedal assembly and a rocker arm. The fixed shaft is arranged on the tractor; the pedal assembly is hinged on the fixed shaft; the rocker arm is hinged on the fixed shaft and fixedly connected to the pedal assembly; the tractor clutch booster device includes an outer sleeve, a combined disc spring and two connecting blocks. The axis of the outer sleeve is perpendicular to the axis of the fixed shaft; the combined disc spring is coaxially inserted into the outer sleeve; the two connecting blocks are inserted into the outer sleeve, located at both ends of the combined disc spring respectively, and both form a stop fit with the combined disc spring. One of the connecting blocks is connected to the rocker arm and can slide along the axis direction of the outer sleeve, and the other connecting block is connected to the tractor. The tractor clutch booster device includes a second adjusting mechanism and multiple inner cylinders with different diameters. The multiple inner cylinders are all coaxially inserted into the outer sleeve; the combined disc spring has multiple large disc spring groups with different diameters, and the multiple large disc spring groups are respectively coaxially inserted into different inner cylinders; each large disc spring group has multiple small disc spring groups. The multiple small disc spring groups of the same large disc spring group are arranged along the axis of the outer sleeve, and the adjacent small disc spring groups of the same large disc spring group are arranged in an end-to-end manner; each small disc spring group has at least one disc spring. When the small disc spring group has two or more disc springs, all the disc springs of the same small disc spring group are stacked; the second adjusting mechanism is configured to be able to adjust the number of combined disc springs that establish a force transmission path with the pedal assembly. The slidable connecting block is hinged on the rocker arm, and the other connecting block is integrally provided with the outer sleeve and jointly hinged on the tractor; the second adjusting mechanism includes multiple sliding rings, multiple annular chambers and multiple piston rings. The sliding rings can slide along the axis direction of the outer sleeve. The multiple sliding rings have different diameters and are respectively inserted into different inner cylinders and can form a stop fit with different large disc spring groups; the multiple annular chambers have different diameters and are coaxially opened on the slidable connecting block; the piston rings can slide along the axis direction of the outer sleeve. The multiple piston rings have different diameters and are respectively inserted into different annular chambers and can respectively form a stop fit with different sliding rings.

5. The tractor clutch boosting device according to claim 4, characterized in that, The second adjusting mechanism further includes a driving assembly configured to provide the driving force for the piston rings to slide.

6. The tractor clutch booster device according to claim 4, wherein, The small end of the disc spring of the small disc spring group closest to the tractor is arranged towards the pedal assembly.

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