Test bench for testing gearbox of harvesting machine

Abstract

The utility model provides a test bench for testing a gearbox of a harvesting machine, which comprises a working table, a driving motor, a walking pump and a walking motor are arranged on the working table, an output shaft of the driving motor is connected with an input shaft of the walking pump, and the walking pump and the walking motor are connected through a hydraulic pipeline to form a loop. An output shaft of the walking motor can be connected with an input shaft of the gearbox; load tables are further arranged on the two sides of the workbench, load motors are arranged on the load tables and connected with a tail end transmission case, and the tail end transmission case can be connected with an output shaft of the gearbox. According to the utility model, the load motors are arranged on the load platforms at the two sides, and the load motors are connected with the transmission case at the tail end, so that the overall test of the gearbox assembly is realized; the transmission case at the tail end and the gearbox run in a linkage state, so that the complex working condition of the gearbox assembly during actual working is simulated; and test plots and agricultural machinists are not needed, so that the test cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of harvesting machinery testing devices, in particular to a test bench for testing a gearbox of a harvesting machinery. Background Art

[0002] The gearbox assembly is the core component of the wheeled harvester transmission system. It has the functions of traveling and shifting. There are three sets of speed gears in the main box of the gearbox assembly. The three-speed shifting is achieved by shifting the fork, thereby realizing the speed shifting of the wheeled machine. In the early stage of research and development, in order to verify the reliability of the gearbox assembly, it is usually necessary to conduct tests simulating the working state to ensure the performance of the vehicle after production. At present, there are two main test methods for the gearbox assembly:

[0003] 1. Install it on the whole machine and carry out performance test, wear test, parts life test and other tests together with the whole machine. However, the harvester is large in size, and in field tests, suitable large plots and professional agricultural machinery operators are required to carry out the tests, which makes the test cost high and cannot be flexibly arranged.

[0004] 2. Disassemble the main box and the terminal transmission box in the gearbox assembly, and drive them separately with motors and other driving equipment for separate tests. This method can only test the reliability of the main box and the terminal transmission box when they are running separately, and cannot simulate the complex working conditions during actual work. The test results deviate from the actual situation to a certain extent, and are not convincing enough. Utility Model Content

[0005] The technical problem to be solved by the utility model is: how to realize reliable test of the gearbox assembly, simulate the complex working conditions during actual work, and reduce the test cost.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] The utility model provides a test bench for testing the gearbox of a harvesting machinery, comprising a workbench, on which a driving motor, a travel pump and a travel motor are arranged, the output shaft of the driving motor is connected to the input shaft of the travel pump, the travel pump and the travel motor are connected to form a loop through a hydraulic pipeline, and the output shaft of the travel motor can be connected to the input shaft of the gearbox; load platforms are also arranged on both sides of the workbench, on which a load motor is arranged, the load motor is connected to a terminal transmission box, and the terminal transmission box can be connected to the output shaft of the gearbox.

[0008] The beneficial effects of the utility model are:

[0009] By adopting the utility model, load motors are arranged on the load platforms on both sides, the load motors are connected to the terminal transmission box, and power is provided to the transmission box through the drive motor, the travel pump and the travel motor, thereby realizing an overall test of the transmission box assembly; the load of the load motor on the terminal transmission box simulates the tire load, and the terminal transmission box and the transmission box operate in a linked state, thereby simulating the complex working conditions of the actual working of the transmission box assembly, improving reliability, and making the test persuasive; in addition, the utility model does not require test plots and agricultural machine operators, reduces the test cost, and can flexibly arrange the test.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, an oil replenishment pump is also provided on the workbench, the inlet of the oil replenishment pump is connected to the oil tank, and the outlet of the oil replenishment pump is connected to the travel pump through an oil replenishment pipeline.

[0012] The oil replenishment pump draws oil from the oil tank and replenishes the oil into the low-pressure side of the travel pump, which is convenient for replenishing oil in the circuit between the travel pump and the travel motor, ensuring the reliability of the travel motor.

[0013] Furthermore, the oil replenishment pump is a gear pump, and a first connecting seat is provided between the travel pump and the gear pump, and the two ends of the first connecting seat are respectively fixed on the housing of the travel pump and the housing of the gear pump; a connecting shaft is provided in the first connecting seat, one end of the connecting shaft is connected to the input shaft of the travel pump, and the other end of the connecting shaft is connected to the input shaft of the oil replenishment pump.

[0014] The input shaft of the travel pump can transmit power to the oil replenishment pump at the same time, with a small installation space and compact structure. The oil replenishment pump does not need to be matched with a separate motor, which reduces costs. At the same time, the travel pump and the oil replenishment pump work synchronously, which is convenient for timely replenishing oil to the circuit between the travel pump and the travel motor, and has good working reliability. The moving parts are separated by the first connecting seat to improve safety.

[0015] Furthermore, a sleeve is provided at one end of the connecting shaft, and the sleeve is provided with an internal spline structure. One end of the sleeve is engaged with the connecting shaft, and the other end of the sleeve is engaged with the input shaft of the travel pump; the other end of the connecting shaft is provided with a groove coaxial with itself, and the groove is engaged with the input shaft of the oil replenishment pump through the internal spline structure.

[0016] The two ends of the connecting shaft can be assembled with the travel pump and the oil replenishing pump by nesting, which is easy to install and has reliable transmission.

[0017] Furthermore, it also includes a radiator, the overflow port of the travel motor is connected to the inlet of the radiator through a hot oil pipeline, and the outlet of the radiator is connected to the oil tank through a cold oil pipeline.

[0018] Through the arrangement of the oil replenishment pump, radiator and its pipelines, when working, the oil is discharged from the oil replenishment pump, then enters the travel pump for oil replenishment and pressurization, and merges with the oil in the circuit, thus avoiding excessive temperature in the circuit; then, the oil enters the travel motor to do work, and the residual pressure causes part of the oil to flow out from the overflow valve, flow to the radiator for cooling through the hot oil pipeline, and finally flow back to the oil tank through the cold oil pipeline, forming a cycle, without the need to stop the machine for centralized cooling of the oil; it can support the test bench to work safely for a long time, avoid overheating, and can effectively simulate the actual working conditions of the gearbox.

[0019] Furthermore, the outlet of the oil replenishment pump is connected to a filter, and the outlet of the filter is connected to the oil replenishment pipeline.

[0020] It is convenient to filter the oil, improve the cleanliness of the hydraulic oil in the circuit, and increase the service life of the equipment on the test bench.

[0021] Furthermore, the oil replenishment pipeline is also connected to a control pipeline, which can be used to connect to a shift multi-way valve attached to the gearbox, and an oil return port of the shift multi-way valve is connected to the oil tank via the oil return pipeline.

[0022] It is convenient to provide pressure oil to the shift multi-way valve, to support the gearbox shifting, and to operate conveniently; at the same time, it makes full use of the output oil of the oil replenishment pump and saves energy.

[0023] Furthermore, the oil replenishment pipeline is also connected to a brake oil circuit, and the brake oil circuit can be used to connect to the brake attached to the gearbox.

[0024] It is convenient to provide pressure oil for the brake of the gearbox, and at the same time fully utilizes the output oil of the oil replenishment pump, saving energy.

[0025] Furthermore, a second connecting seat is provided on the travel motor, a motor connecting sleeve is provided in the second connecting seat, an internal spline structure is provided in the motor connecting sleeve, one end of the motor connecting sleeve is meshed with the input shaft of the gearbox, and the other end of the motor connecting sleeve is meshed with the output shaft of the travel motor.

[0026] During installation, the input shaft of the gearbox is simply inserted into the motor connecting sleeve, which is convenient for installation and improves work efficiency. At the same time, the rotating parts are separated by the second connecting seat, which improves safety.

[0027] Furthermore, an elastic cylindrical pin is provided in the middle of the motor connecting sleeve, and the elastic cylindrical pin is vertical and penetrates the motor connecting sleeve.

[0028] Avoiding the movement of the motor connecting sleeve ensures uniform transmission stress at both ends of the motor connecting sleeve and increases service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the utility model.

[0030] Figure 2 It is the hydraulic connection diagram of the travel pump, travel motor, gearbox and radiator.

[0031] Figure 3 for Figure 2 Enlarged detail of the hydraulic pipelines of the travel pump and the oil replenishment pump.

[0032] Figure 4 This is a schematic diagram of the connection structure between the travel pump and the gear pump.

[0033] Figure 5 It is a structural schematic diagram of the second connecting socket.

[0034] In the accompanying drawings, the technical features represented by the reference numerals are as follows:

[0035] 1- workbench; 2- drive motor; 3- travel pump; 4- travel motor; 5- load motor; 6- terminal transmission box; 7- oil supply pump; 8- oil tank; 9- oil supply pipeline; 10- first connecting seat; 11- connecting shaft; 12- shaft sleeve; 13- radiator; 14- hot oil pipeline; 15- cold oil pipeline; 16- filter; 17- control pipeline; 18- brake oil circuit; 19- oil return pipeline; 20- second connecting seat; 21- motor connecting sleeve; 22- elastic cylindrical pin;

[0036] 30-gearbox; 31-shift multi-way valve. DETAILED DESCRIPTION

[0037] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0038] This utility model refers to Figure 1-5 .

[0039] The utility model provides a test bench for testing the gearbox of a harvesting machinery, comprising a workbench 1, on which a driving motor 2, a travel pump 3 and a travel motor 4 are arranged, the output shaft of the driving motor 2 is connected to the input shaft of the travel pump 3, the travel pump 3 and the travel motor 4 are connected through a hydraulic pipeline to form a loop, and the output shaft of the travel motor 4 can be connected to the input shaft of the gearbox 30; load platforms are also arranged on both sides of the workbench 1, and a load motor 5 is arranged on the load platform, the load motor 5 is connected to a terminal transmission box 6, and the terminal transmission box 6 can be connected to the output shaft of the gearbox 30.

[0040] principle:

[0041] A gearbox 30 is matched with two terminal transmission boxes 6 to form a gearbox assembly, which is a prior art product on harvesting machinery. The gearbox 30 has two output shafts, and the two output shafts are respectively connected to the terminal transmission boxes 6. The terminal transmission boxes 6 are used to connect the tires and transmit power to the tires. The load motor 5 is a prior art, and its principle is equivalent to a generator. When the terminal transmission box 6 transmits the power of the gearbox 30 to the load motor 5, electromagnetic induction is generated between the rotor and the stator inside the load motor 5, thereby generating resistance on the rotor, simulating the tire resistance during actual work. When only the gearbox 30 needs to be tested, two terminal transmission boxes 6 specially used for testing can be used to simulate the working conditions of the two output shafts of the gearbox 30 when they are actually working.

[0042] During the test, the drive motor 2 drives the travel pump 3. The direction of the drive motor 2 determines the direction of the travel pump 3. The direction of the travel pump 3 determines the flow direction of the hydraulic oil in the circuit, and then determines the direction of the travel motor 4; thus, the travel motor 4 can input forward and reverse power to the gearbox 30. The gearbox 30 has a shifting structure inside, and the terminal transmission box 6 is also equipped with a brake. The test can be used to perform shifting performance tests, transmission efficiency tests at different speeds, wear tests, brake performance tests, and parts life tests.

[0043] By adopting the utility model, load motors 5 are arranged on the load platforms on both sides, the load motors 5 are connected to the terminal transmission box 6, and power is provided to the gearbox 30 through the drive motor 2, the travel pump 3 and the travel motor 4, thereby realizing an overall test of the gearbox assembly; the load of the load motor 5 on the terminal transmission box 6 simulates the tire load, and the terminal transmission box 6 and the gearbox 30 operate in a linked state, thereby simulating the complex working conditions of the actual working of the gearbox assembly, improving the reliability, and making the test persuasive; in addition, the utility model does not require test plots and agricultural machine operators, reduces the test cost, and can flexibly arrange the test.

[0044] Further, such as Figure 2-3 As shown: the workbench 1 is also provided with an oil replenishing pump 7, the inlet of the oil replenishing pump 7 is connected to the oil tank 8, and the outlet of the oil replenishing pump 7 is connected to the travel pump 3 through the oil replenishing pipeline 9.

[0045] Note: A one-way valve is provided in the oil replenishment pipeline 9, which can make the oil flow to the travel pump 3 in one direction. In addition, the outlet of the oil replenishment pump 7 can also be connected to the travel motor 4 through other oil replenishment pipes. The oil replenishment pipeline 9 and other oil replenishment pipes are respectively connected to the two sides of the circuit. The travel pump 3 can replenish oil to the low-pressure side at any time whether it is rotating forward or reverse.

[0046] The oil replenishment pump 7 sucks oil from the oil tank 8 and replenishes the oil into the low-pressure side of the travel pump 3, so as to replenish the oil for the circuit between the travel pump 3 and the travel motor 4, thereby ensuring the reliability of the travel motor 4.

[0047] Further, such as Figure 4 As shown: the oil replenishing pump 7 is a gear pump, and a first connecting seat 10 is provided between the travel pump 3 and the gear pump, and the two ends of the first connecting seat 10 are respectively fixed on the housing of the travel pump 3 and the housing of the gear pump; a connecting shaft 11 is provided in the first connecting seat 10, one end of the connecting shaft 11 is connected to the input shaft of the travel pump 3, and the other end of the connecting shaft 11 is connected to the input shaft of the oil replenishing pump 7.

[0048] Note: One end of the input shaft of the travel pump 3 is connected to the drive motor 2, and the other end is connected to the connecting shaft 11.

[0049] The input shaft of the travel pump 3 can transmit power to the oil replenishment pump 7 at the same time, with a small installation space and a compact structure. The oil replenishment pump 7 does not need to be matched with a separate motor, which reduces the cost. At the same time, the travel pump 3 and the oil replenishment pump 7 work synchronously, which is convenient for timely replenishing oil to the circuit between the travel pump 3 and the travel motor 4, and has good working reliability. The moving parts are separated by the first connecting seat 10, which improves safety.

[0050] Furthermore, a shaft sleeve 12 is provided at one end of the connecting shaft 11, and the shaft sleeve 12 is provided with an internal spline structure. One end of the shaft sleeve 12 is meshed with the connecting shaft 11, and the other end of the shaft sleeve 12 is meshed with the input shaft of the travel pump 3; the other end of the connecting shaft 11 is provided with a groove coaxial with itself, and the groove is meshed with the input shaft of the oil replenishing pump 7 through the internal spline structure.

[0051] The two ends of the connecting shaft 11 can be assembled with the travel pump 3 and the oil replenishing pump 7 by nesting, which is convenient to install and has reliable transmission.

[0052] Further, such as Figure 2-3 As shown: a radiator 13 is also included, the overflow port of the travel motor 4 is connected to the inlet of the radiator 13 through a hot oil pipeline 14, and the outlet of the radiator 13 is connected to the oil tank 8 through a cold oil pipeline 15.

[0053] Note: There is an overflow valve inside the travel motor 4. When the oil pressure in the travel motor 4 is too high, the oil can overflow to the overflow port through the overflow valve. This structure is the original structure of the travel motor 4 product and belongs to the prior art. In addition, the outlet of the radiator 13 can also be connected to the travel pump 3 through other oil replenishment pipes.

[0054] Through the oil replenishment pump 7, the radiator 13 and their pipeline arrangement, when working, after the oil is output from the oil replenishment pump 7, it enters the travel pump 3 for oil replenishment and pressure increase, and merges with the oil in the circuit, thereby avoiding excessive temperature in the circuit; then, the oil enters the travel motor 4 to perform work, and the residual pressure causes part of the oil to flow out from the overflow valve, flow to the radiator 13 through the hot oil pipeline 14 for cooling, and finally flow back to the oil tank 8 through the cold oil pipeline 15, forming a circulation, without the need to stop the machine for centralized cooling of the oil; it can support the long-term safe operation of the test bench, avoid overheating, and can effectively simulate the actual working conditions of the gearbox 30.

[0055] Furthermore, the outlet of the oil replenishment pump 7 is connected to a filter 16 , and the outlet of the filter 16 is connected to the oil replenishment pipeline 9 .

[0056] It is convenient to filter the oil, improve the cleanliness of the hydraulic oil in the circuit, and increase the service life of the equipment on the test bench.

[0057] Furthermore, the oil replenishment pipeline 9 is also connected to a control pipeline 17 , which can be used to connect to a shift multi-way valve 31 attached to the gearbox 30 , and an oil return port of the shift multi-way valve 31 is connected to the oil tank 8 via an oil return pipeline 19 .

[0058] Note: The shift multi-way valve 31 is used to control the shift oil cylinder on the gearbox 30. The shift multi-way valve 31 and the shift oil cylinder are both part of the gearbox 30 and belong to the prior art.

[0059] It is convenient to provide pressure oil for the shift multi-way valve 31, to support the gear shifting of the gearbox 30, and to operate conveniently; at the same time, the output oil of the oil replenishment pump 7 is fully utilized, thus saving energy.

[0060] Furthermore, the oil replenishment pipeline 9 is also connected to a brake oil circuit 18 , and the brake oil circuit 18 can be used to connect to a brake attached to the gearbox 30 .

[0061] Note: The brake is a part of the gearbox 30, located on the two output shafts of the gearbox 30, and belongs to the prior art. The normal state of the brake is the braking state, and when the brake receives oil pressure, it is the brake release state.

[0062] It is convenient to provide pressure oil for the brake of the gearbox 30, and at the same time, the output oil of the oil replenishment pump 7 is fully utilized, thereby saving energy.

[0063] Further, such as Figure 2 , 5 As shown: the travel motor 4 is provided with a second connecting seat 20, the second connecting seat 20 is provided with a motor connecting sleeve 21, the motor connecting sleeve 21 is provided with an internal spline structure, one end of the motor connecting sleeve 21 is meshed with the input shaft of the gearbox 30, and the other end of the motor connecting sleeve 21 is meshed with the output shaft of the travel motor 4.

[0064] During installation, the input shaft of the gearbox 30 is inserted into the motor connecting sleeve 21, which is convenient for installation and improves work efficiency. At the same time, the rotating parts are separated by the second connecting seat 20, which improves safety.

[0065] Furthermore, an elastic cylindrical pin 22 is provided in the middle of the motor connecting sleeve 21 , and the elastic cylindrical pin 22 is vertical and penetrates the motor connecting sleeve 21 .

[0066] The motor connecting sleeve 21 is prevented from moving, thus ensuring uniform transmission stress at both ends of the motor connecting sleeve 21 and prolonging its service life.

[0067] In the description of the present invention, it should be understood that if there are descriptive terms indicating orientation, direction or positional relationship, such as: "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the referred part, element or whole must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0068] In addition, if there are order description terms, such as "first", "second", etc., their purpose in this specification is to facilitate understanding or simplify description. For example, in order to distinguish multiple technical features of the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] In the present utility model, if the terms describing the relative functional relationship of the structures are used, such as "install", "connect", "connect", "fix", etc., they should be understood in a broad sense unless otherwise clearly specified and limited. For example, "install", "connect", "connect", etc. can be a fixed connection, a detachable connection, or an integrated one; can be a mechanical connection or an electrical connection; can be a direct connection or an indirect connection through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements; "fix" can be an integrated fixation or a detachable fixation through fasteners; can be a direct fixation or a fixation through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present utility model can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0070] In the present invention, if there are descriptive terms with subsidiary or connecting meanings, for example, the first feature is "on" or "below" the second feature, unless otherwise clearly specified and limited, it should not be interpreted in a restrictive manner. For example, "on" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of the different embodiments and examples described in this specification without contradiction, and these combinations or combinations shall all fall within the scope summarized by the utility model.

[0072] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. A person skilled in the art can change, modify, replace and modify the above embodiments within the scope of information available from public channels and in combination with the technical inspiration provided by the present application documents.

Claims

1. A test bench for testing a gearbox of a harvesting machine, characterized in that: The invention comprises a workbench (1), wherein the workbench (1) is provided with a driving motor (2), a travel pump (3) and a travel motor (4), wherein the output shaft of the driving motor (2) is connected to the input shaft of the travel pump (3), the travel pump (3) and the travel motor (4) are connected via a hydraulic pipeline to form a circuit, and the output shaft of the travel motor (4) can be connected to the input shaft of the gearbox (30); load platforms are also provided on both sides of the workbench (1), and a load motor (5) is provided on the load platform, and the load motor (5) is connected to a terminal transmission box (6), and the terminal transmission box (6) can be connected to the output shaft of the gearbox (30).

2. The test bench for testing the gearbox of a harvesting machine according to claim 1, characterized in that: The workbench (1) is also provided with an oil replenishment pump (7), the inlet of the oil replenishment pump (7) is connected to an oil tank (8), and the outlet of the oil replenishment pump (7) is connected to a travel pump (3) via an oil replenishment pipeline (9).

3. The test bench for testing the gearbox of a harvesting machine according to claim 2, characterized in that: The oil replenishment pump (7) is a gear pump, and a first connecting seat (10) is provided between the travel pump (3) and the gear pump, and the two ends of the first connecting seat (10) are respectively fixed on the housing of the travel pump (3) and the housing of the gear pump; a connecting shaft (11) is provided in the first connecting seat (10), and one end of the connecting shaft (11) is connected to the input shaft of the travel pump (3), and the other end of the connecting shaft (11) is connected to the input shaft of the oil replenishment pump (7).

4. The test bench for testing the gearbox of a harvesting machine according to claim 3, characterized in that: One end of the connecting shaft (11) is provided with a shaft sleeve (12), and the shaft sleeve (12) is provided with an internal spline structure. One end of the shaft sleeve (12) is meshed with the connecting shaft (11), and the other end of the shaft sleeve (12) is meshed with the input shaft of the travel pump (3); the other end of the connecting shaft (11) is provided with a groove coaxial with itself, and the groove is meshed with the input shaft of the oil replenishment pump (7) through the internal spline structure.

5. The test bench for testing the gearbox of a harvesting machine according to claim 2, characterized in that: It also includes a radiator (13), wherein the overflow port of the travel motor (4) is connected to the inlet of the radiator (13) via a hot oil pipeline (14), and the outlet of the radiator (13) is connected to the oil tank (8) via a cold oil pipeline (15).

6. The test bench for testing the gearbox of a harvesting machine according to claim 2, characterized in that: The outlet of the oil replenishment pump (7) is connected to a filter (16), and the outlet of the filter (16) is connected to the oil replenishment pipeline (9).

7. The test bench for testing the gearbox of a harvesting machine according to claim 2, characterized in that: The oil replenishment pipeline (9) is also connected to a control pipeline (17), and the control pipeline (17) can be used to connect to a shift multi-way valve (31) attached to the gearbox (30), and the oil return port of the shift multi-way valve (31) is connected to the oil tank (8) via the oil return pipeline (19).

8. The test bench for testing the gearbox of a harvesting machine according to claim 2, characterized in that: The oil replenishment pipeline (9) is also connected to a brake oil circuit (18), and the brake oil circuit (18) can be used to connect to a brake attached to the gearbox (30).

9. The test bench for testing the gearbox of a harvesting machine according to claim 1, characterized in that: The travel motor (4) is provided with a second connecting seat (20), a motor connecting sleeve (21) is provided inside the second connecting seat (20), an internal spline structure is provided inside the motor connecting sleeve (21), one end of the motor connecting sleeve (21) is meshed with the input shaft of the gearbox (30), and the other end of the motor connecting sleeve (21) is meshed with the output shaft of the travel motor (4).

10. The test bench for testing the gearbox of a harvesting machine according to claim 9, characterized in that: An elastic cylindrical pin (22) is provided in the middle of the motor connecting sleeve (21), and the elastic cylindrical pin (22) is vertical and penetrates the motor connecting sleeve (21).

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