Power input transmission structure and gearbox

Abstract

The utility model relates to agricultural implement technical field provides a power input transmission structure and gearbox. Power input transmission structure includes power input drive shaft assembly, first hydraulic stepless speed changer and second hydraulic stepless speed changer. Power input drive shaft assembly contains power input shaft and drive bevel gear, input shaft input end is connected engine, and the output end is connected tractor power output shaft, and drive bevel gear is installed on it and is connected with the output end. First hydraulic stepless speed changer is at power input shaft side, and input end is connected drive bevel gear output end, and the output end is connected steering power output shaft, and second hydraulic stepless speed changer is at the other side, and the connection mode is similar, but the output end is connected walking power output shaft. Both symmetry distribution is in power input shaft axis both sides. The design has solved the problem that crawler tractor is difficult to control left and right crawler belt synchronous different speed accurately to adapt to different turning radius.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, and in particular to a power input transmission structure and gearbox. Background Technology

[0002] In my country's hilly and mountainous areas, agricultural land is characterized by small, irregularly shaped plots with significant slopes, especially the terraced fields in high mountains, which present a unique working environment. Under these natural constraints, traditional agricultural machinery is difficult to operate effectively, thus creating an urgent need for a lightweight tracked tractor specifically designed for mountainous environments. Furthermore, to adapt to the complex and varied road conditions and operational requirements of mountainous terrain, this tracked tractor should possess the ability to precisely control the left and right tracks simultaneously at different speeds via a steering wheel, flexibly handling various turning radii. Simultaneously, it should also be able to achieve simultaneous but different-direction rotation of the left and right tracks, easily enabling on-the-spot turning, thereby improving efficiency and convenience in working on narrow, irregular fields and slopes. Utility Model Content

[0003] The purpose of this invention is to provide a power input transmission structure and gearbox to solve the key problem in the current technology that tracked tractors cannot accurately control the left and right tracks to achieve synchronous different speeds, so as to flexibly cope with various turning radii.

[0004] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0005] In a first aspect, this utility model provides a power input transmission structure, which includes a power input drive shaft assembly, a first hydraulic continuously variable transmission (CVT), and a second hydraulic CVT. The power input drive shaft assembly includes a power input shaft and a drive bevel gear. The input end of the power input shaft is connected to an engine, and the output end of the power input shaft is connected to a tractor power output shaft. The drive bevel gear is mounted on the power input shaft and connected to the output end of the power input drive shaft assembly. The first hydraulic CVT is mounted on one side of the power input shaft, with its input end connected to the output end of the drive bevel gear and its output end connected to a steering power output shaft. The second hydraulic CVT is mounted on the other side of the power input shaft, with its input end connected to the output end of the drive bevel gear and its output end connected to a travel power output shaft. The first hydraulic CVT and the second hydraulic CVT are symmetrically arranged on both sides of the axis of the power input shaft.

[0006] Furthermore, the power input drive shaft assembly includes an oil seal, a first locking nut, a first anti-loosening washer, a first bearing, and a spacer. The oil seal, the first locking nut, the first anti-loosening washer, the first bearing, the spacer, and the drive bevel gear are sequentially arranged on the power input shaft along the axial direction.

[0007] Furthermore, the power input drive shaft assembly includes a bearing housing and an end cap sleeved on the power input shaft, the end cap being located on the outermost side and abutting against the bearing housing.

[0008] Furthermore, the first bearing is an angular contact ball bearing.

[0009] Furthermore, there are two angular contact ball bearings, with a bearing washer provided between the two angular contact ball bearings, and the two ends of the bearing washer abutting against the two angular contact ball bearings respectively.

[0010] Furthermore, the two angular contact ball bearings are mounted back-to-back.

[0011] Furthermore, there are two oil seals.

[0012] Furthermore, both the first hydraulic continuously variable transmission and the second hydraulic continuously variable transmission include an input shaft, on which a second locking nut, a second anti-loosening washer, a driven bevel gear, a second bearing, and a positioning sleeve are sequentially fitted.

[0013] Furthermore, the second bearing is an angular contact ball bearing, and there are two of them, which are mounted back to back.

[0014] Secondly, this utility model also provides a gearbox, which includes a housing and the aforementioned power input transmission structure. The housing has a receiving cavity, and an input hole is provided on the front side of the housing. The input end of the power input shaft extends out of the input hole, and output holes are provided on the left and right sides of the housing, respectively. The first hydraulic continuously variable transmission and the second hydraulic continuously variable transmission are respectively located outside the output holes.

[0015] Based on the above technical solutions, the technical effects achievable by this utility model can be analyzed as follows:

[0016] 1. Power is transmitted to the first hydraulic continuously variable transmission and the second hydraulic continuously variable transmission through the power input drive shaft assembly, which respectively drive the steering power output shaft and the travel power output shaft, realizing the continuously variable transmission function of dual flow, improving the working efficiency and flexibility of the tractor.

[0017] 2. The power input shaft on the power input drive shaft assembly can directly transmit the engine's power to the tractor's power output shaft at the rear of the gearbox. At the same time, it can also realize stepless speed change of the steering power output shaft and the travel power output shaft through a hydraulic continuously variable transmission, which improves the diversity and adaptability of power transmission and meets different operating requirements.

[0018] 3. The first and second hydraulic continuously variable transmissions are symmetrically arranged on both sides of the power input shaft, which is compact and has high transmission efficiency. This allows the tractor to achieve stepless speed change when moving and to achieve synchronous but different speeds for the left and right tracks when turning, thereby achieving various turning radii and synchronous but different directions for the left and right tracks, enabling U-turns on the spot. This improves the tractor's turning flexibility and operating efficiency in complex terrain such as hilly and mountainous areas. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A three-dimensional structural schematic diagram of the power input transmission structure provided in an embodiment of this utility model from one angle;

[0021] Figure 2 A three-dimensional structural schematic diagram of the power input transmission structure provided in an embodiment of this utility model from another angle;

[0022] Figure 3 This is a three-dimensional structural diagram of the gearbox provided in an embodiment of the present utility model.

[0023] icon:

[0024] 1. Power input drive shaft assembly; 11. Power input shaft; 12. Oil seal; 13. First lock nut; 14. First anti-loosening washer; 15. First bearing; 16. Bearing washer; 17. Spacer; 18. Drive bevel gear;

[0025] 2. First input shaft structure; 21. Second locking nut; 22. Second anti-loosening washer; 23. Driven bevel gear; 24. Sub-input shaft; 25. Second bearing; 26. Positioning sleeve;

[0026] 3. Second input shaft structure;

[0027] 4. First hydraulic continuously variable transmission;

[0028] 5. Walking power output shaft;

[0029] 6. Steering power take-off shaft;

[0030] 7. Second hydraulic continuously variable transmission;

[0031] 8. Box body;

[0032] 9. Bearing housing;

[0033] 10. End caps. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this 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 addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0041] See Figures 1 to 2 The present invention provides a power input transmission structure, which includes a power input drive shaft assembly 1, a first hydraulic continuously variable transmission 4, and a second hydraulic continuously variable transmission 7.

[0042] The power input drive shaft assembly 1 includes a power input shaft 11 and a drive bevel gear 18. The input end of the power input shaft 11 is used to connect to the engine, and the output end of the power input shaft 11 is used to connect to the tractor's power output shaft.

[0043] The drive bevel gear 18 is mounted on the power input shaft 11 and is connected to the output end of the power input drive shaft assembly 1.

[0044] The first hydraulic continuously variable transmission 4 is located on one side of the power input shaft 11, with its input end connected to the output end of the drive bevel gear 18 and its output end connected to the steering power output shaft 6.

[0045] The second hydraulic continuously variable transmission 7 is located on the other side of the power input shaft 11, with its input end connected to the output end of the drive bevel gear 18 and its output end connected to the travel power output shaft 5.

[0046] The first hydraulic continuously variable transmission 4 and the second hydraulic continuously variable transmission 7 are symmetrically arranged on both sides of the axis of the power input shaft 11.

[0047] This invention transmits power to the first hydraulic continuously variable transmission (CVT) 4 and the second hydraulic CVT 7 via the power input drive shaft assembly 1, which respectively drive the steering power output shaft 6 and the travel power output shaft 5, thereby realizing the continuously variable transmission function of the dual flow and improving the working efficiency and flexibility of the tractor.

[0048] Furthermore, the power input shaft 11 on the power input drive shaft assembly 1 can directly transmit the engine's power to the tractor's power output shaft at the rear of the gearbox. At the same time, it can also realize stepless speed change of the steering power output shaft 6 and the travel power output shaft 5 through a hydraulic continuously variable transmission, which improves the diversity and adaptability of power transmission and meets different operational needs.

[0049] Furthermore, the first hydraulic continuously variable transmission 4 and the second hydraulic continuously variable transmission 7 are symmetrically arranged on both sides of the power input shaft 11. The structure is compact and the transmission efficiency is high, which enables the tractor to achieve stepless speed change when walking and to achieve synchronous different speeds of the left and right tracks when turning. This allows for various turning radii and synchronous different directions of the left and right tracks, enabling the tractor to turn around on the spot. This improves the tractor's turning flexibility and operating efficiency in complex terrain such as hilly and mountainous areas.

[0050] In some embodiments, the power input drive shaft assembly 1 includes an oil seal 12, a first locking nut 13, a first anti-loosening washer 14, a first bearing 15, and a spacer 17. The oil seal 12, first locking nut 13, first anti-loosening washer 14, first bearing 15, spacer 17, and drive bevel gear 18 are sequentially arranged on the power input shaft 11 along the axial direction. These components, arranged sequentially on the power input shaft 11 along the axial direction, ensure the stability and reliability of power transmission. The oil seal 12 prevents lubricating oil leakage, the locking nut and anti-loosening washer ensure a reliable connection between the power input shaft 11 and the drive bevel gear 18, the bearing supports the power input shaft 11 and reduces friction, and the spacer 17 adjusts the clearance between the components, thereby ensuring the efficient operation of the entire power transmission system.

[0051] In some embodiments, the power input drive shaft assembly 1 includes a bearing housing 9 and an end cap 10 sleeved on the power input shaft 11. The end cap 10 is located on the outermost side and abuts against the bearing housing 9. The bearing housing 9 provides stable support for the power input shaft 11, ensuring that the power input shaft 11 maintains a precise axial position during operation, thereby improving the stability and reliability of power transmission. The tight abutment between the end cap 10 and the bearing housing 9 further enhances the rigidity of the entire power input drive shaft assembly 1, effectively reducing component displacement or deformation caused by vibration or impact, and extending the service life of the power input shaft 11 and related transmission components. Furthermore, the tight fit between the end cap 10 and the bearing housing 9 forms an effective sealing barrier, which can effectively prevent external dust, water, oil, and other impurities from entering the interior of the power input drive shaft assembly 1, protecting the internal bearings, gears, and other critical components from contamination and corrosion, and ensuring their normal operation in complex working environments. This sealing design also prevents internal lubricating grease leakage, ensuring that bearings and other components are always in a good lubricated state, reducing wear, improving component service life, and enhancing the reliability of the entire system.

[0052] Furthermore, the abutment mechanism between the end cap 10 and the bearing housing 9 makes the entire power input drive shaft assembly 1 more compact, facilitating installation and positioning on the gearbox housing 8. This structure also simplifies disassembly and reassembly processes when maintenance or component replacement is required, reducing maintenance difficulty and cost, and improving maintenance efficiency.

[0053] In some embodiments, the first bearing 15 is an angular contact ball bearing. Angular contact ball bearings can withstand large radial and axial loads, possess high precision and high rotational stability, ensuring the stability and precision of the power input shaft 11 during high-speed operation and high torque transmission, thereby improving the reliability and lifespan of the entire power transmission system. The low frictional torque of angular contact ball bearings effectively reduces energy loss during power transmission, improving power transmission efficiency and enabling the engine's power to be transmitted more efficiently to various working components of the tractor, enhancing the tractor's operating efficiency. In the complex operating environment of the tractor, angular contact ball bearings can adapt to different working conditions, such as uneven roads and slope operations, maintaining good performance and reliability, thus ensuring the stability of power transmission and operating efficiency of the tractor throughout the entire operation. Due to the high performance and reliability of angular contact ball bearings, their service life is relatively long, reducing the number of maintenance operations caused by bearing wear, extending the tractor's maintenance cycle, reducing maintenance costs, and improving the tractor's economic efficiency and work efficiency.

[0054] In some embodiments, two angular contact ball bearings are used, with a bearing washer 16 placed between them. The two ends of the bearing washer 16 abut against the two angular contact ball bearings respectively. Adding the bearing washer 16 between the two angular contact ball bearings increases the distance between the bearing action points. This design significantly improves the load-bearing capacity and torque resistance of the entire power input drive shaft assembly 1. By increasing the bearing washer 16, the distance between the two angular contact ball bearings is increased, thereby increasing the distance between the bearing action points. This allows the entire system to withstand greater torque loads, improving the stability and reliability of the tractor under complex terrain and heavy-duty operating conditions. The bearing washer 16 abutting against the two angular contact ball bearings at both ends can evenly distribute axial and radial loads, reducing the stress on individual bearings, reducing bearing wear, and extending bearing service life.

[0055] In some embodiments, two angular contact ball bearings are mounted back-to-back, meaning the raceways of the inner and outer rings of the bearings are axially opposed. This mounting method provides higher axial and radial rigidity, effectively improving the system's load-bearing capacity and torque resistance. Back-to-back mounting allows the bearings some freedom during thermal expansion, reducing changes in bearing preload caused by thermal expansion and thus extending bearing life. Back-to-back mounting can evenly distribute axial and radial loads, reducing the stress on individual bearings, decreasing bearing wear, and improving system reliability and service life. In complex operating environments, back-to-back mounted bearings can better withstand multi-directional loads and torques, improving system stability and reliability, and ensuring the normal operation of the tractor under various working conditions.

[0056] In some embodiments, the number of oil seals 12 is two. Replacing the traditional round nut and locking washer structure with two oil seals 12, anti-loosening washers, and lock nuts significantly improves the preload reliability of the angular contact ball bearing. This design effectively prevents nut loosening due to vibration and impact, ensuring stable bearing preload and thus extending bearing life. The combination of the new anti-loosening washer and lock nut is more compact, reducing the number and complexity of components and improving the assembly efficiency and reliability of the entire power input drive shaft assembly 1. Through the rational design of the new anti-loosening washer and lock nut, sealing performance is further enhanced, ensuring the sealing effect of the oil seals 12, preventing lubricating grease leakage and the ingress of external impurities, and improving the overall reliability of the system.

[0057] In some embodiments, both the first hydraulic continuously variable transmission (CVT) 4 and the second hydraulic CVT 7 include input shaft structures, which are identical. For ease of description, the input shaft structures are referred to as a first input shaft structure 2 and a second input shaft structure 3, respectively. The first input shaft structure 2 is used for steering, and the second input shaft structure 3 is used for driving travel. Both the first input shaft structure 2 and the second input shaft structure 3 include a sub-input shaft 24, on which a second locking nut 21, a second anti-loosening washer 22, a driven bevel gear 23, a second bearing 25, and a positioning sleeve 26 are sequentially arranged. This structural design ensures precise meshing between the driven bevel gear 23 and the driving bevel gear 18, improving the stability and reliability of power transmission. Specifically, the combination of the locking nut and the anti-loosening washer ensures reliable fixation of the driven bevel gear 23 on the input shaft, preventing loosening due to vibration and impact, and improving the stability of the system. The precise meshing between the driven bevel gear 23 and the driving bevel gear 18 ensures high precision and high efficiency of power transmission, reduces energy loss, and improves the overall performance of the system. Angular contact ball bearings provide stable support for the input shaft, ensuring its stability and accuracy during high-speed operation and high torque transmission, thus extending the service life of the input shaft and related components. The locating sleeve 26 ensures precise alignment of the input shaft with other components, improving the assembly accuracy and operational stability of the entire system.

[0058] This structural design also helps improve the sealing performance of the hydraulic continuously variable transmission (CVT), preventing internal hydraulic oil leakage and preventing external impurities from entering, thus ensuring the normal operation of the CVT.

[0059] In some embodiments, the second bearing 25 is an angular contact ball bearing, and there are two of them, which are mounted back to back.

[0060] like Figure 3 As shown, this utility model also provides a gearbox, including a housing 8 and the aforementioned power input transmission structure. The housing 8 has a receiving cavity, and an input hole is provided on the front side of the housing 8. The input end of the power input shaft 11 extends out of the input hole. Output holes are provided on the left and right sides of the housing 8, respectively. The first hydraulic continuously variable transmission 4 and the second hydraulic continuously variable transmission 7 are respectively located outside the output holes.

[0061] This gearbox design achieves precise power distribution through its structural design. The short path from input to output with low loss significantly improves power transmission efficiency and delivers outstanding performance during acceleration. The compact arrangement of components and the reduced size of the gearbox body (8) make it suitable for small agricultural machinery. Precise positioning of the input and output ports ensures stable power input, meeting diverse operational needs. The gearbox body (8) provides stable support and protection for internal components, reducing the impact of vibrations and shocks from complex terrain on the transmission system, improving overall machine stability, and extending service life. Combining the advantages of the input transmission structure, such as dual-flow continuously variable transmission (CVT) and one-point input / three-point output, it can flexibly handle complex hilly and mountainous terrain, adapting to different slopes and small plots of farmland, meeting diverse operational requirements. The hydraulic CVT is located outside the output port, facilitating maintenance and repair without disassembling the entire gearbox, reducing maintenance costs and improving efficiency. Optimized anti-loosening washers, locking nuts, and oil seals (12), combined with the compact gearbox body (8) structure, greatly enhance system reliability and ensure continuous operation. The hydraulic continuously variable transmission is placed on the outside of the housing 8, which facilitates subsequent functional expansion or performance upgrades, such as power output shaft expansion or control precision improvement, to meet users' personalized needs.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A power input transmission structure, characterized in that, include: A power input drive shaft assembly includes a power input shaft and a drive bevel gear. The input end of the power input shaft is used to connect to an engine, and the output end of the power input shaft is used to connect to a tractor power output shaft. The drive bevel gear is mounted on the power input shaft and is connected to the output end of the power input drive shaft assembly. A first hydraulic continuously variable transmission is disposed on one side of the power input shaft. The input end of the first hydraulic continuously variable transmission is connected to the output end of the drive bevel gear, and its output end is connected to the steering power output shaft. A second hydraulic continuously variable transmission is provided on the other side of the power input shaft. The input end of the second hydraulic continuously variable transmission is connected to the output end of the drive bevel gear, and its output end is connected to the travel power output shaft. The first hydraulic continuously variable transmission and the second hydraulic continuously variable transmission are symmetrically arranged on both sides of the axis of the power input shaft.

2. The power input transmission structure according to claim 1, characterized in that, The power input drive shaft assembly includes an oil seal, a first locking nut, a first anti-loosening washer, a first bearing, and a spacer. The oil seal, the first locking nut, the first anti-loosening washer, the first bearing, the spacer, and the drive bevel gear are sequentially arranged on the power input shaft along the axial direction.

3. The power input transmission structure according to claim 2, characterized in that, The power input drive shaft assembly includes a bearing housing and an end cover sleeved on the power input shaft, wherein the end cover is located on the outermost side and abuts against the bearing housing.

4. The power input transmission structure according to claim 2, characterized in that, The first bearing is an angular contact ball bearing.

5. The power input transmission structure according to claim 4, characterized in that, There are two angular contact ball bearings, and a bearing washer is provided between the two angular contact ball bearings. The two ends of the bearing washer abut against the two angular contact ball bearings respectively.

6. The power input transmission structure according to claim 4, characterized in that, The two angular contact ball bearings are mounted back to back.

7. The power input transmission structure according to claim 2, characterized in that, There are two oil seals.

8. The power input transmission structure according to claim 1, characterized in that, Both the first hydraulic continuously variable transmission and the second hydraulic continuously variable transmission include an input shaft, on which a second locking nut, a second anti-loosening washer, a driven bevel gear, a second bearing, and a positioning sleeve are sequentially fitted.

9. The power input transmission structure according to claim 8, characterized in that, The second bearing is an angular contact ball bearing, and there are two of them, which are installed back to back.

10. A gearbox, characterized in that, The device includes a housing and a power input transmission structure as described in any one of claims 1-9. The housing has a receiving cavity, an input hole is provided on the front side of the housing, the input end of the power input shaft extends out of the input hole, and output holes are provided on the left and right sides of the housing, respectively. The first hydraulic continuously variable transmission and the second hydraulic continuously variable transmission are respectively located outside the output holes.

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