Hydrostatic harvester gearbox

Abstract

The utility model relates to the technical field of gearboxes and agricultural machinery, in particular to a hydrostatic harvester gearbox, and aims to solve the problems of high failure rate, high maintenance cost, dependence on operating skills of a driver and the like of a traditional mechanical gearbox. The gearbox is driven by hydrostatic pressure, stepless speed change is achieved, a mechanical clutch is not needed, and the output torque and the rotating speed can be automatically adjusted according to the load condition of the whole machine. The gearbox can be compatibly provided with a hydraulic motor or an HST, and the requirements of different complete machine manufacturers are met. Besides, according to the design of the gearbox, four-axle assemblies with different lengths can be replaced according to different whole vehicle weights and front axle loads, and selection of rear axle driving can be achieved by operating a four-wheel drive fork shaft, so that the requirements of different application scenes are met. The gearbox has the advantages of being compact in structure, easy and convenient to operate, high in reliability, low in maintenance cost and the like, and the operation efficiency and flexibility of the harvester are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gearboxes and agricultural machinery, in particular to a hydrostatic harvester gearbox. Background Art

[0002] The information disclosed in the background technology of the present invention is only intended to increase the understanding of the overall background of the present invention, and shall not necessarily be regarded as an admission or suggestion in any form that the information constitutes the prior art already known to those skilled in the art.

[0003] Traditional harvester gearboxes mainly adopt mechanical structures, and their power transmission process relies on the combination of belts and clutches, that is, the engine pulley drives the gearbox pulley through the belt, and then inputs the power to the gearbox's one-shaft assembly through the mechanical clutch. The gearbox under this structure realizes multi-speed forward and reverse through the gears and shifting mechanisms on each shaft. However, due to the use of a mechanical clutch, the driver needs to perform a semi-clutch operation during the shifting process, which not only increases the driver's operating difficulty, but also cannot avoid early wear and burning of the clutch, resulting in a high failure rate of the gearbox, which in turn makes the subsequent service costs high.

[0004] In addition, the gear shifting operation of the traditional gearbox relies on the driver's judgment and reaction speed, and cannot adjust the output torque and speed in real time according to the actual working conditions, which limits the operating efficiency and flexibility of the harvester under complex terrain conditions.

[0005] Therefore, it is necessary to develop a new type of hydrostatic harvester gearbox. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a hydrostatic harvester gearbox, which aims to solve the problems existing in traditional mechanical gearboxes, such as high failure rate, high maintenance cost and dependence on the driver's operating skills.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A hydrostatic harvester gearbox, comprising a gearbox body, wherein a first shaft assembly, a second shaft assembly, a third shaft assembly, a fourth shaft assembly and a four-wheel drive fork shaft are installed in the gearbox body, and an HST input shaft assembly adapted to an HST or a motor connection seat for fixing and installing a hydraulic motor is arranged on the left side of the gearbox body;

[0009] The input end of the shaft assembly is connected to the output shaft of the HST through the input gear shaft assembly, or is directly connected to the output shaft of the hydraulic motor;

[0010] The one-shaft assembly includes a first meshing sleeve, three input gears and an output gear, and the two-shaft assembly includes a second meshing sleeve, three input gears and an output gear. The three output gears of the one-shaft assembly are respectively meshed with the three input gears of the two-shaft assembly by moving the second meshing sleeve, and the first gear, the second gear and the third gear are switched by moving the first meshing sleeve to cooperate with the three input gears of the one-shaft assembly.

[0011] The hydraulic motor and the HST are both provided with corresponding forward joysticks and reverse joysticks for shifting to realize three forward gears and three reverse gears;

[0012] The output end of the two-shaft assembly includes two transmission routes, one of which is a route in which the output gear in the middle of the two-shaft assembly is meshed with the differential gear of the three-shaft assembly, and the two output gears on the left and right sides of the three-shaft assembly are respectively meshed with the two input gears of the four-shaft assembly, so that the power is transmitted from the two-shaft assembly to the three-shaft assembly and the four-shaft assembly in sequence, and the four-shaft output end of the four-shaft assembly drives the front wheels of the harvester to rotate; wherein a brake disc that is hydraulically braked by a brake caliper is provided on the right gear of the two-shaft assembly;

[0013] The other route is that the output gear on the left side of the two-shaft assembly is drivingly connected to the fifth-shaft input end of the five-shaft assembly, the fifth-shaft output end of the five-shaft assembly is drivingly connected to the sixth-shaft input end of the six-shaft assembly, the sixth-shaft output end of the six-shaft assembly is connected to the input end of the rear axle, and the output end of the rear axle drives the rear wheel to rotate;

[0014] The first engagement sleeve and the second engagement sleeve are driven to move left and right through the four-wheel drive fork shaft in cooperation with the shift fork, so as to realize the transmission connection or disconnection of the rear axle.

[0015] Preferably, the input end of the HST is transmission-connected to the input end of the input gear shaft assembly, and the output end of the input gear shaft assembly is transmission-connected to the input end of a shaft assembly via a matching gear.

[0016] Preferably, the HST input shaft is drivingly connected to the output end of the engine via a pulley of the HST input shaft assembly.

[0017] Preferably, the output shafts of the hydraulic motor and the HST are respectively connected to the input end of a shaft assembly and the input end of an input gear shaft assembly through corresponding spline sleeves.

[0018] Preferably, the input end of the shaft assembly is connected to the output shaft of the hydraulic motor via a first spline sleeve;

[0019] The output end of the HST input shaft assembly is connected to the input shaft of the HST via a second spline sleeve.

[0020] Preferably, the six-axis output end of the six-axis assembly is connected to the rear axle input end via a flange.

[0021] The utility model includes but is not limited to the following beneficial effects:

[0022] The hydrostatic harvester gearbox of the utility model improves the ease of operation and reliability. It can automatically adjust the output torque and speed according to the load conditions of the entire machine through the hydrostatic drive to achieve stepless speed change. The driver does not need to frequently perform half-clutch operations, which reduces the driver's workload. It also reduces the wear and burning of the clutch, thereby improving the reliability and durability of the system.

[0023] The hydraulic system in the hydrostatic harvester gearbox of the utility model can quickly respond to load changes, thereby optimizing the performance of the entire machine, achieving dynamic response, and improving the operating efficiency and flexibility of the harvester under complex terrain conditions. The output speed and torque can be more accurately controlled through the hydraulic system, which helps to improve the harvesting quality and reduce losses, thereby improving performance and efficiency.

[0024] The power input of the hydrostatic harvester gearbox of the utility model adopts a modular design, and the gearbox can be compatible with the installation of a hydraulic motor or HST, which provides more selection space for different machine manufacturers and enhances the versatility and interchangeability of the product. In addition, four-axle assemblies of different lengths can be selected according to the weight of the harvester and the front axle load to meet the needs of harvesters of different models and specifications.

[0025] In addition, by manipulating the four-wheel drive fork shaft, you can flexibly choose whether to enable the rear axle drive, thereby realizing the four-wheel drive function, which is critical for improving the vehicle's traction and escape ability in muddy or complex terrain.

[0026] The hydrostatic harvester gearbox of the utility model removes the traditional mechanical clutch, reduces the number of vulnerable parts, and thus reduces the failure rate and maintenance frequency. The hydrostatic system is easier to maintain than the mechanical system, reducing service costs and downtime. Thus, the maintenance cost and service cost are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0028] Figure 2 It is a structural schematic diagram of the sealing structure of a traditional pressure relief cover.

[0029] The reference numerals involved in the accompanying drawings are:

[0030] 1. Motor connector; 2. Spline sleeve; 3. One-shaft assembly; 4. Two-shaft assembly; 5. Three-shaft assembly; 6. Four-shaft assembly; 7. Transmission body; 8. Five-shaft assembly; 9. Six-shaft assembly; 10. Four-wheel drive fork shaft; 11. HST input shaft assembly; 12. Spline sleeve; 13. Input gear shaft assembly. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0032] Figure 1 to Figure 2 A hydrostatic harvester gearbox is shown, including a gearbox body 7, in which a first shaft assembly 3, a second shaft assembly 4, a third shaft assembly 5, a fourth shaft assembly 6 and a four-wheel drive fork shaft 10 are installed, and an HST input shaft assembly 11 adapted to the HST or a motor connection seat 1 for fixing and installing a hydraulic motor is provided on the left side of the gearbox body 7;

[0033] The input end of the shaft assembly 3 is connected to the output shaft of the HST through the input gear shaft assembly 13, or is directly connected to the output shaft of the hydraulic motor;

[0034] The one-shaft assembly 3 includes a first meshing sleeve, three input gears and an output gear, and the two-shaft assembly 4 includes a second meshing sleeve, three input gears and an output gear. The three output gears of the one-shaft assembly 3 are respectively meshed with the three input gears of the two-shaft assembly 4 by moving the second meshing sleeve, and the first gear, the second gear and the third gear are switched by moving the first meshing sleeve to cooperate with the three input gears of the one-shaft assembly 3.

[0035] The hydraulic motor and the HST are both provided with corresponding forward joysticks and reverse joysticks for shifting to realize three forward gears and three reverse gears;

[0036] The output end of the two-shaft assembly 4 includes two transmission routes, one of which is a route in which the output gear in the middle of the two-shaft assembly 4 is meshed with the differential gear of the three-shaft assembly 5, and the two output gears on the left and right sides of the three-shaft assembly 5 are respectively meshed with the two input gears of the four-shaft assembly 6, so that the power is transmitted from the two-shaft assembly 4 to the three-shaft assembly 5 and the four-shaft assembly 6 in sequence, and the four-shaft output end of the four-shaft assembly 6 drives the front wheels of the harvester to rotate; wherein, a brake disc that is hydraulically braked by a brake caliper is provided on the right gear of the two-shaft assembly 4;

[0037] The other route is that the output gear on the left side of the two-shaft assembly 4 is transmission-connected with the five-shaft input end of the five-shaft assembly 8, the five-shaft output end of the five-shaft assembly 8 is transmission-connected with the six-shaft input end of the six-shaft assembly 9, the six-shaft output end of the six-shaft assembly 9 is connected with the input end of the rear axle, and the output end of the rear axle drives the rear wheel to rotate;

[0038] The first engagement sleeve and the second engagement sleeve are driven to move left and right by the four-wheel drive fork shaft 10 in cooperation with the shift fork to realize the transmission connection or disconnection of the rear axle.

[0039] The input end of the HST is transmission-connected to the input end of the input gear shaft assembly 13 , and the output end of the input gear shaft assembly 13 is transmission-connected to the input end of a shaft assembly 3 via a matching gear.

[0040] The HST input shaft is drivingly connected to the output end of the engine via a pulley of the HST input shaft assembly 11 .

[0041] The input end of the one-shaft assembly 3 is connected to the output shaft of the hydraulic motor via a first spline sleeve 12 ; the output end of the HST input shaft assembly 11 is connected to the input shaft of the HST via a second spline sleeve 12 .

[0042] The structure of the hydrostatic harvester gearbox of the present application is significantly different from that of the conventional harvester gearbox:

[0043] One of the significant differences:

[0044] Conventional harvester gearboxes are mechanical. The power is driven by the engine pulley through the belt to drive the gearbox pulley to rotate, and is transmitted to the first shaft assembly 3 through the mechanical clutch input. The power is transmitted to the gearbox body 7 through the gears and shifting mechanisms on each shaft to achieve multi-speed forward and single-speed reverse or multi-speed reverse. In addition, due to the use of a mechanical clutch, the driver has a semi-clutch phenomenon when shifting gears, so it is impossible to fundamentally eliminate the high failure rate of early clutch wear and burning, which brings passivity to the later market service and causes high service costs.

[0045] The hydrostatic harvester gearbox has no mechanical clutch and is installed with HST (HST is the abbreviation of hydraulic stepless transmission. It integrates the functions of hydraulic pump, hydraulic motor and control valve) or hydraulic motor (the hydraulic motor at this time is separated from the hydraulic pump. They are two separate assemblies), and the power input is realized through hydrostatic pressure. Due to the hydrostatic drive, the output torque and speed can be automatically adjusted according to the load of the whole machine, thereby realizing stepless speed change.

[0046] The second significant difference:

[0047] The hydrostatic harvester gearbox takes into account the installation and use of the hydraulic motor and the HST. On the basis of installing the hydraulic motor, the motor connection seat 1 is removed, the HST input shaft assembly 11 and the input gear shaft assembly 13 are added, and the HST is installed and used on the right side of the gearbox body 7. The hydraulic motor and the HST can be adapted to the corresponding shaft assembly 3 respectively.

[0048] The third significant difference:

[0049] The hydrostatic harvester gearbox can replace the four-axle assembly 6 of different lengths according to the weight of the whole vehicle and the actual load bearing of the front axle to meet the vehicle requirements of harvesters with different numbers of rows. In addition, the gearbox also has a four-wheel drive structure. According to the requirements of the harvester, the road surface and the topography of the farmland, it can choose to drive the rear axle or not drive the rear axle in time. When the rear axle is driven at the same time, the harvester's ability to get out of trouble is greatly improved. Therefore, the hydrostatic harvester gearbox has better adaptability and meets the optional requirements of different harvesters.

[0050] In summary, the multi-speed hydrostatic harvester gearbox has the following advantages:

[0051] First, it adopts hydrostatic drive to achieve stepless speed change. There is no high failure rate of mechanical transmission clutch, which greatly reduces market service costs.

[0052] Secondly, it can be equipped with hydraulic motors or HST to meet the needs of different machine manufacturers.

[0053] Third, according to the vehicle weight and the actual load bearing of the front axle, the four-axle assembly of different lengths can be replaced 6. The four-wheel drive function can be used in a timely manner according to the road conditions, and the whole machine has better adaptability to meet the optional requirements of different harvester manufacturers.

[0054] The working principle of the hydrostatic harvester gearbox of this application is as follows:

[0055] When the hydraulic motor is installed, the output torque and speed of the hydraulic motor can be automatically adjusted according to the load of the whole machine. The hydraulic motor can realize forward or reverse function.

[0056] The transmission route when installing HST is as follows: the engine power is input to the HST input shaft through the pulley of the HST input shaft assembly 11, and connected to the HST input shaft through the spline sleeve 12. The output shaft of the HST is connected to the input gear shaft assembly 13 through the internal spline. The power is input to the first shaft assembly 3 through the gear transmission.

[0057] The output torque and speed of the HST are automatically adjusted according to the load of the whole machine. The HST can realize forward or reverse function.

[0058] The three gears on the first shaft assembly 3 are meshed with the three gears on the second shaft assembly 4. Through the shift mechanism, the second meshing sleeve on the right side of the second shaft assembly 4 and the first meshing sleeve on the left side of the first shaft assembly 3 are moved respectively to realize the switching of the first gear, the second gear and the third gear. The power is transmitted from the first shaft assembly 3 to the second shaft assembly 4. Therefore, in conjunction with the forward or reverse joystick on the hydraulic motor or HST, three forward gears and three reverse gears are realized.

[0059] In addition, the power is transmitted in two ways on the second shaft assembly 4:

[0060] One of the power paths: the middle gear of the second-axis assembly 4 meshes with the differential gear of the third-axis assembly 5, and the two gears on the left and right sides of the third-axis assembly 5 mesh with the two gears on the fourth-axis assembly 6 respectively. The power is transmitted from the second-axis assembly 4 to the third-axis assembly 5, and then from the third-axis assembly 5 to the fourth-axis assembly 6, and the wheel rim of the front wheel is driven to rotate through the fourth-axis. Among them, there is a brake disc on the right side of the second-axis assembly 4, and the brake function is realized through the hydraulic braking of the brake caliper. The fourth-axis assembly 6 of different lengths can be replaced according to the weight of the whole vehicle and the actual load bearing of the front axle to meet the vehicle requirements of harvesters with different numbers of rows.

[0061] Another power: through the gear on the left side of the second-axis assembly 4, it is transmitted to the fifth-axis assembly 8. Then through a pair of bevel gears, the power is transmitted to the sixth-axis assembly 9. Through the flange on the sixth axis, the power is transmitted to the rear axle through the transmission shaft, thereby driving the rear axle tires to rotate at the same time, greatly improving the harvester's ability to escape from difficulties.

[0062] According to the road surface and farmland topography, the four-wheel drive fork shaft 10 is manipulated to move the engagement sleeve left and right to realize the two functions of rear axle non-driving or rear axle driving.

[0063] In addition, the shift mechanism assembly (not shown in the structural diagram, according to the prior art) can realize upper shifting at the upper cover position or side shifting at the side of the transmission case 7 according to the needs of the whole machine.

[0064] In summary, the hydrostatic harvester gearbox abandons the traditional mechanical clutch and adopts a hydraulic continuously variable transmission (HST) or an independent hydraulic motor as the power input device. It can not only automatically adjust the output torque and speed according to the load of the whole machine to achieve stepless speed change, but also eliminate the high failure rate of the mechanical clutch and reduce the subsequent service costs.

[0065] At the same time, it is highly modular and adaptable, and can flexibly configure the drive mode and the length of the four-axle assembly 6 according to different machine requirements and terrain conditions, providing a four-wheel drive structure to enhance the ability to escape from difficulties and adapt to various road conditions. This design greatly improves the overall performance and operating efficiency of the harvester and meets the diverse needs of different harvesters.

[0066] Therefore, this hydrostatic harvester gearbox not only solves the problems existing in traditional mechanical gearboxes, but also further improves the overall performance of the harvester and reduces operating costs, which is of great significance for promoting the development of agricultural mechanization.

[0067] The terms "upper", "lower", "outer side", "inner side", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish the relative relationship in position if they exist, and do not need to be qualitative. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0068] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydrostatic harvester gearbox, comprising a gearbox body, in which a first shaft assembly, a second shaft assembly, a third shaft assembly, a fourth shaft assembly and a four-wheel drive fork shaft are installed, characterized in that: The left side of the gearbox body is provided with an HST input shaft assembly adapted to the HST or a motor connection seat for fixing and installing a hydraulic motor; The input end of the shaft assembly is connected to the output shaft of the HST through the input gear shaft assembly, or is directly connected to the output shaft of the hydraulic motor; The one-shaft assembly includes a first meshing sleeve, three input gears and an output gear, and the two-shaft assembly includes a second meshing sleeve, three input gears and an output gear. The three output gears of the one-shaft assembly are respectively meshed with the three input gears of the two-shaft assembly by moving the second meshing sleeve, and the first gear, the second gear and the third gear are switched by moving the first meshing sleeve to cooperate with the three input gears of the one-shaft assembly. The hydraulic motor and the HST are both provided with corresponding forward joysticks and reverse joysticks for shifting to realize three forward gears and three reverse gears; The output end of the two-shaft assembly includes two transmission routes, one of which is a route in which the output gear in the middle of the two-shaft assembly is meshed with the differential gear of the three-shaft assembly, and the two output gears on the left and right sides of the three-shaft assembly are respectively meshed with the two input gears of the four-shaft assembly, so that the power is transmitted from the two-shaft assembly to the three-shaft assembly and the four-shaft assembly in sequence, and the four-shaft output end of the four-shaft assembly drives the front wheels of the harvester to rotate; wherein a brake disc that is hydraulically braked by a brake caliper is provided on the right gear of the two-shaft assembly; The other route is that the output gear on the left side of the two-shaft assembly is drivingly connected to the fifth-shaft input end of the five-shaft assembly, the fifth-shaft output end of the five-shaft assembly is drivingly connected to the sixth-shaft input end of the six-shaft assembly, the sixth-shaft output end of the six-shaft assembly is connected to the input end of the rear axle, and the output end of the rear axle drives the rear wheel to rotate; The first engagement sleeve and the second engagement sleeve are driven to move left and right through the four-wheel drive fork shaft in cooperation with the shift fork, so as to realize the transmission connection or disconnection of the rear axle.

2. The hydrostatic harvester gearbox according to claim 1, characterized in that: The input end of the HST is transmission-connected to the input end of the input gear shaft assembly, and the output end of the input gear shaft assembly is transmission-connected to the input end of a shaft assembly through an adaptive gear.

3. The hydrostatic harvester gearbox according to claim 1, characterized in that: The HST input shaft is drivingly connected to the output end of the engine through a pulley of the HST input shaft assembly.

4. The hydrostatic harvester gearbox according to claim 1, characterized in that: The output shafts of the hydraulic motor and the HST are respectively connected to the input end of the first shaft assembly and the input end of the input gear shaft assembly through corresponding spline sleeves.

5. The hydrostatic harvester gearbox according to claim 4, characterized in that: The input end of the shaft assembly is connected to the output shaft of the hydraulic motor via a first spline sleeve; The output end of the HST input shaft assembly is connected to the input shaft of the HST via a second spline sleeve.

6. The hydrostatic harvester gearbox according to any one of claims 1 to 5, characterized in that: The six-axis output end of the six-axis assembly is connected to the rear axle input end through a flange.

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