Reversing gearbox installation method, harvester production method and reversing gearbox positioning fixture

Abstract

This invention relates to the field of harvesters, and discloses a method for installing a reversing box for a harvester, a method for producing a harvester, and a reversing box positioning fixture, comprising: S1. assembling the positioning sleeve of the reversing box positioning fixture onto the rear connecting shaft of the threshing drum; S2. adjusting the height of the rear crossbeam so that the rear crossbeam is supported at the bottom of the reversing box positioning fixture, and fixing the rear crossbeam and the reversing box positioning fixture together with fasteners; S3. fixing both ends of the rear crossbeam to the mounting frame; S4. removing the fasteners connecting the rear crossbeam and the reversing box positioning fixture, and removing the reversing box positioning fixture; S5. hoisting and fixing the reversing box onto the rear crossbeam, and drivingly connecting the power output shaft of the reversing box to the rear connecting shaft of the threshing drum. This installation method can accurately position the installation position of the reversing box relative to the threshing drum, and thus effectively ensures the coaxiality between its power output shaft and the rear connecting shaft of the threshing drum after the reversing box is installed onto the rear crossbeam.

Description

Technical Field

[0001] This invention relates to the field of harvesters, and more specifically to a method for installing a reversing box in a harvester. Furthermore, this invention also relates to a method for producing a harvester and a reversing box positioning fixture. Background Technology

[0002] As an important type of agricultural machinery, harvesters are increasingly widely used in harvesting crops such as corn, greatly improving harvesting efficiency and reducing labor costs. Axial-flow harvesters are a common type of harvester. Their axial-flow drums can perform both threshing and separating functions, and typically receive power from the engine through a reversing box to redirect the power output from the engine to the working direction of the axial-flow drum. For ease of explanation, the threshing drums of harvesters will be collectively referred to as "threshing drums" below.

[0003] The reversing box has a power input shaft for drive-through connection to the power output end of the engine and a power output shaft for drive-through connection to the rear connecting shaft of the threshing drum, the axes of which are perpendicular to each other. Typically, the reversing box can be mounted on a horizontally arranged rear crossbeam, the two ends of which are connected to the mounting frame of the harvester. During installation, it is necessary to ensure the precise positional accuracy of the rear crossbeam on the mounting frame and the reversing box on the rear crossbeam to ensure the coaxiality of the power output shaft of the reversing box and the rear connecting shaft of the threshing drum. If this coaxiality cannot be well guaranteed, the drive connection structure between the threshing drum and the reversing box may be damaged after a period of operation, or even seize up and become unable to rotate. However, the aforementioned positional accuracy depends on the design and manufacturing precision of each component, and also requires precise control of the relative positional relationship between the relevant components during installation. Therefore, how to ensure the coaxiality of the power output shaft of the reversing box and the rear connecting shaft of the threshing drum, and reduce the failure rate of the harvester's threshing system, improve threshing efficiency and reliability, is a problem that needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem in the prior art that it is difficult to ensure the coaxiality of the power output shaft of the reversing box and the rear connecting shaft of the threshing drum, resulting in a high failure rate and low threshing efficiency of the harvester's threshing system. This invention provides a reversing box installation method for a harvester. This installation method can accurately determine the installation position of the reversing box and ensure that the power output shaft of the reversing box and the rear connecting shaft of the threshing drum are installed with a high degree of coaxiality, thereby effectively reducing the failure rate of the harvester's threshing system and improving threshing efficiency and reliability.

[0005] To achieve the above objectives, the present invention provides a method for installing a reversing box for a harvester, comprising the following steps: S1. Assembling the positioning sleeve of the reversing box positioning fixture onto the rear connecting shaft of the threshing drum; S2. Adjusting the height of the rear crossbeam so that the rear crossbeam is supported at the bottom of the reversing box positioning fixture, and fixing the rear crossbeam and the reversing box positioning fixture together with fasteners; S3. Fixing both ends of the rear crossbeam to the mounting frame; S4. Removing the fasteners connecting the rear crossbeam and the reversing box positioning fixture, and removing the reversing box positioning fixture; S5. Hoisting and fixing the reversing box onto the rear crossbeam, and drivingly connecting the power output shaft of the reversing box to the rear connecting shaft of the threshing drum.

[0006] Preferably, an internal spline is formed on the inner peripheral wall of the positioning sleeve, and an external spline is formed on the outer peripheral wall of the rear connecting shaft of the threshing drum. In step S1, the positioning sleeve is assembled onto the rear connecting shaft of the threshing drum by engaging the internal spline with the external spline.

[0007] Preferably, in step S5, the power output shaft of the reversing box is connected to the rear connecting shaft of the threshing drum by installing internal spline sprockets at opposite ends of the power output shaft of the reversing box and the rear connecting shaft of the threshing drum, and connecting a double-row chain to the internal spline sprockets.

[0008] Preferably, the reversing box positioning fixture includes a mounting base, and mounting bosses are formed at the corner positions of the bottom surface of the mounting base. In step S2, the rear crossbeam is adjusted to be supported on the mounting bosses.

[0009] Preferably, fastener mounting holes are formed at the positions of the mounting bosses on the mounting base. In step S2, the fasteners pass through the fastener mounting holes and fix the rear crossbeam and the reversing box positioning fixture to each other.

[0010] Preferably, the mounting base is provided with at least two support plates arranged at intervals along the extension direction of the positioning sleeve, and the positioning sleeve is fixed to the support plate and is fixed to be spaced apart from the mounting base.

[0011] Preferably, in step S3, the rear crossbeam is fixed to the mounting frame and extends in the horizontal direction.

[0012] Preferably, the mounting frame has a mounting groove, and in step S3, both ends of the rear crossbeam are fixed to the mounting groove by fastening bolts; and / or, in step S5, the reversing box is fixed to the rear crossbeam by fastening bolts.

[0013] Preferably, after step S2, when the rear crossbeam and the reversing box positioning fixture are fixed together, the distance between the center line of the positioning sleeve and the top surface of the rear crossbeam is d1; after step S5, when the reversing box is fixed to the rear crossbeam, the distance between the center line of the power output shaft of the reversing box and the top surface of the rear crossbeam is d2, wherein d1 is 1.1mm-2.5mm smaller than d2.

[0014] A second aspect of the present invention provides a method for producing a harvester, the method comprising a reversing gearbox installation step using the reversing gearbox installation method described above.

[0015] A third aspect of the present invention provides a reversing box positioning fixture, including a mounting base that can be supported and detachably fixed to a rear crossbeam for mounting the reversing box and a positioning sleeve disposed on the mounting base, the positioning sleeve being configured to be assembled to a rear connecting shaft of a threshing drum.

[0016] Preferably, the inner peripheral wall of the positioning sleeve is formed with an internal spline for engaging with the rear connecting shaft of the threshing drum.

[0017] Preferably, mounting bosses are formed at the corners of the bottom surface of the mounting base, and fastener mounting holes are formed on the mounting bosses so that they can be supported and detachably fixed to the rear crossbeam for mounting the reversing box by fasteners passing through the fastener mounting holes.

[0018] Preferably, the mounting base is provided with at least two support plates arranged at intervals along the extension direction of the positioning sleeve, and the positioning sleeve is fixed to the support plate and is fixed to be spaced apart from the mounting base.

[0019] Through the above technical solution, the reversing box installation method of the present invention first uses the reversing box positioning fixture to determine the fixed position of the rear crossbeam used for installing the reversing box on the mounting frame. This accurately positions the reversing box relative to the threshing drum, and after the reversing box is installed on the rear crossbeam, it effectively ensures the coaxiality between its power output shaft and the rear connecting shaft of the threshing drum, thereby reliably transmitting power to the threshing drum. This effectively reduces the failure rate of the harvester's threshing system and improves threshing efficiency, reliability, and economy. During installation, the fixed position of the rear crossbeam on the mounting frame can be easily adjusted using the reversing box positioning fixture assembled on the rear connecting shaft of the detached drum as a reference, without relying on the precise relative position accuracy between the rear crossbeam and the mounting frame determined during the design and manufacturing of the components. This allows for a simple and convenient completion of the reversing box installation process, effectively improving production efficiency. Attached Figure Description

[0020] Figure 1This is a flowchart of a switch box installation method according to a preferred embodiment of the present invention;

[0021] Figure 2 This is a front view of a reversing box positioning fixture according to a preferred embodiment of the present invention;

[0022] Figure 3 yes Figure 2 Left view of the reversing box positioning fixture in the middle;

[0023] Figure 4 yes Figure 2 A top view of the reversing box positioning fixture.

[0024] Explanation of reference numerals in the attached figures

[0025] 10-Reversing box positioning fixture; 1-Positioning sleeve; 11-Internal spline; 2-Support plate; 3-Mounting base; 31-Mounting boss; 32-Fastener mounting hole. Detailed Implementation

[0026] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0027] Reference Figure 1 As shown, according to a preferred embodiment of the present invention, a reversing box installation method for a harvester can be used to install the reversing box to a position connected to the threshing drum drive during the harvester's production process. Typically, the harvester is a longitudinal axial flow harvester, which has a longitudinal axial flow drum. The power output from the engine needs to be reversed by the reversing box and transmitted to the longitudinal axial flow drum.

[0028] The reversing box installation method includes the following steps: S1. Assemble the positioning sleeve of the reversing box positioning fixture onto the rear connecting shaft of the threshing drum; S2. Adjust the height of the rear crossbeam so that the rear crossbeam is supported on the bottom of the reversing box positioning fixture, and use fasteners to fix the rear crossbeam and the reversing box positioning fixture to each other; S3. Fix both ends of the rear crossbeam to the mounting frame; S4. Remove the fasteners connecting the rear crossbeam and the reversing box positioning fixture, and remove the reversing box positioning fixture; S5. Hoist the reversing box and fix it onto the rear crossbeam, and drive the power output shaft of the reversing box to the rear connecting shaft of the threshing drum.

[0029] In this preferred embodiment, the reversing box positioning fixture is first used to determine the fixed position of the rear crossbeam on the mounting frame for installing the reversing box. This accurately positions the reversing box relative to the threshing drum, ensuring the coaxiality between its power output shaft and the rear connecting shaft of the threshing drum after the reversing box is installed on the rear crossbeam, thus reliably transmitting power to the threshing drum. Therefore, harvesters produced using this installation method can effectively reduce the risk of damage to the transmission connection structure between the threshing drum and the reversing box, or even seizing and becoming unable to rotate, exhibiting advantages such as low failure rate and high operational reliability. During installation, the reversing box positioning fixture mounted on the rear connecting shaft of the threshing drum can be used as a reference to easily adjust the fixed position of the rear crossbeam on the mounting frame, without relying on the precise relative position accuracy between the rear crossbeam and the mounting frame determined during the design and manufacturing of the components. Even if the two side walls of the mounting frame used to fix the rear crossbeam deform due to welding or other reasons, it will not affect the relative position between the fixed rear crossbeam and the threshing drum. Therefore, the coaxiality between the power output shaft of the reversing box and the rear connecting shaft of the threshing drum can be reliably guaranteed after installation. Thus, the reversing box installation method of the present invention can complete the reversing box installation process simply and conveniently, effectively improving production efficiency.

[0030] Figures 2 to 4 A reversing box positioning fixture 10 is shown that can be used in the above-described reversing box installation method. It has a positioning sleeve 1 for assembly with the rear connecting shaft of the threshing drum in step S1. By aligning the positioning sleeve 1 with the rear connecting shaft of the threshing drum, the fixed position of the rear crossbeam on the mounting frame can be determined relatively accurately, thereby indirectly confirming the precise installation position of the reversing box relative to the threshing drum.

[0031] Typically, the rear connecting shaft of the threshing drum and the power output shaft of the reversing gearbox can have splines for transmission to achieve a transmission connection between them. In a preferred embodiment, the positioning sleeve 1 of the reversing gearbox positioning fixture 10 can have an internal spline 11 formed at one end for assembly to the rear connecting shaft of the threshing drum, and an external spline can be formed on the rear connecting shaft of the threshing drum. Thus, in step S1, the positioning sleeve can be assembled onto the rear connecting shaft of the threshing drum by engaging the internal spline 11 of the positioning sleeve 1 with the external spline of the rear connecting shaft. With this configuration, since the assembly method of the reversing box positioning fixture 10 and the threshing drum during the above installation process is similar to the transmission connection method between the reversing box and the threshing drum (such as the internal spline sprocket assembled to the rear connecting shaft of the threshing drum as described later), unnecessary wear on the positioning sleeve 1 of the reversing box positioning fixture 10 or the rear connecting shaft of the threshing drum can be effectively reduced or avoided. It can also ensure that the reversing box is well connected to the rear connecting shaft of the threshing drum after installation, reducing the risk of the threshing drum seizing up or becoming unable to rotate after running for a period of time and the risk of damage to the transmission connection structure.

[0032] In step S5, the power output shaft of the reversing box can be connected to the rear connecting shaft of the threshing drum in various suitable ways. In a structure where an external spline is formed on the outer peripheral wall of the rear connecting shaft of the threshing drum, internal splined sprockets can be installed at opposite ends of the rear connecting shaft and the power output shaft of the reversing box, and double-row chains can be connected to these internal splined sprockets to connect the power output shaft of the reversing box to the rear connecting shaft of the threshing drum. Thus, the reversing box can be installed with its power output shaft and the rear connecting shaft of the threshing drum coaxially opposite each other, thereby achieving power transmission through the aforementioned internal splined sprockets and double-row chains. Compared to other transmission structures, this method offers advantages such as simplicity, reliability, and ease of maintenance.

[0033] Additionally, the reversing gearbox positioning fixture 10 may include a mounting base 3, with mounting bosses 31 formed at the corners of its bottom surface. In step S2, the rear crossbeam is adjusted to be supported by the mounting bosses 31. Compared to a flat bottom surface, the reversing gearbox positioning fixture 10, supported on the rear crossbeam by the mounting bosses 31 formed on the bottom surface of the mounting base 3, can effectively reduce the gap error after the rear crossbeam and the reversing gearbox positioning fixture 10 are fixed together by reducing the contact area. This allows the reversing gearbox positioning fixture 10 to fully fit the top surface of the rear crossbeam, which is beneficial for accurately determining the fixed position of the rear crossbeam to the mounting frame.

[0034] Furthermore, fastener mounting holes 32 can be formed at the positions corresponding to the mounting boss 31 on the mounting base 3. In step S2, fasteners, such as bolts, can pass through the fastener mounting holes 32 to fix the rear crossbeam and the reversing gearbox positioning fixture 10 to each other, thereby determining the fixed position of the rear crossbeam to the mounting frame. Correspondingly, in step S5, the reversing gearbox can also be fixed to the rear crossbeam using fastening bolts, thereby facilitating the disassembly, adjustment, and maintenance of the reversing gearbox.

[0035] In step S3, where the rear crossbeam is fixed to the mounting frame, both ends are secured to the mounting frame with fastening bolts, and after installation, the fastening bolts on both sides remain parallel in height (i.e., the rear crossbeam extends horizontally). To facilitate easy adjustment of the fixed position of the rear crossbeam during installation, a mounting groove (e.g., extending vertically) can be formed on the mounting frame. Thus, in step S3, where the rear crossbeam is fixed to the mounting frame, its fixed position relative to the mounting frame can be adjusted by raising or lowering the rear crossbeam along the mounting groove.

[0036] In the preferred embodiment illustrated, the commutator positioning fixture 10 further includes a pair of support plates 2 disposed on the mounting base 3. The pair of support plates 2 are arranged at intervals from each other along the extending direction of the positioning sleeve 1. The positioning sleeve 1 is fixed to the support plates 2 and is fixed at a distance from the mounting base 3. Thus, the height of the positioning sleeve 1 on the support plates 2 can be set according to the designed installation height of the commutator's power output shaft, thereby adapting it to the installation of the commutator.

[0037] For ease of explanation, in the state after step S2, when the rear crossbeam and the reversing box positioning fixture 10 are fixed together, the distance between the center line of the positioning sleeve 1 and the top surface of the rear crossbeam is defined as d1; in the state after step S5, when the reversing box is fixed to the rear crossbeam, the distance between the center line of the power output shaft of the reversing box and the top surface of the rear crossbeam is defined as d2. Theoretically, d1 and d2 being equal can better ensure the coaxiality between the power output shaft of the reversing box and the rear connecting shaft of the threshing drum. However, in a more preferred embodiment of the present invention, considering the weight of the rear crossbeam and the assembly sequence, it is set such that d1 is 1.1mm-2.5mm smaller than d2. Experimental verification shows that this setting can still maintain the transmission engagement between the power output shaft of the reversing box and the rear connecting shaft of the threshing drum well after cumulative trial running-in time, which can effectively avoid the abnormal breakage of the double-row chain used for transmission.

[0038] Specifically, the reversing box is centered on the rear crossbeam. Considering gravity, the maximum deflection of the rear crossbeam is Y. max= 5*qL^2 / (384EI), where q is the load under the design condition, L is the length of the rear crossbeam, and E and I are the corresponding elastic modulus and moment of inertia. Substituting the relevant data, we can obtain: Y max =0.24mm (This value is the drop in centerline of the power output shaft of the reversing gearbox relative to the centerline of the positioning sleeve 1 of the reversing gearbox positioning fixture).

[0039] Furthermore, considering the wear generated during operation, M14 bolts with a pitch P of 2mm, a mean diameter D2 of 12.70mm, and a nominal diameter D of 14mm are selected for the connection. During machine operation or after a period of time, wear will inevitably occur at the threaded connection between this bolt and the rear crossbeam. Therefore, a 1.1mm-2.5mm dimensional allowance can be reserved to compensate for dimensional losses caused by deformation of the rear crossbeam and wear at the connection point. This helps ensure high threshing efficiency and threshing economy.

[0040] Therefore, when designing the position height of the positioning sleeve 1, it can be set to be 1.1mm-2.5mm lower than the distance between the center line of the power output shaft of the reversing gearbox and the top surface of the rear crossbeam. Simultaneously, the dimensional accuracy of the tooling should be checked regularly during use, and the tooling should be replaced before tolerance wear occurs in critical positioning parts. Tests show that this setup can significantly reduce the frequency of related failures, with very few failures caused by insufficient installation accuracy.

[0041] Another aspect of the present invention provides a method for producing a harvester, the method comprising a reversing gearbox installation step using the reversing gearbox installation method described above.

[0042] As mentioned above, the present invention also provides a commutator positioning fixture 10, which can be used to assist in the above-described commutator installation method. Specifically, refer to... Figures 2 to 4As shown, the reversing gearbox positioning fixture 10 includes a mounting base 3 that can be supported and detachably fixed to the rear crossbeam for mounting the reversing gearbox, and a positioning sleeve 1 provided on the mounting base 3. The positioning sleeve 1 is configured to be assembled to the rear connecting shaft of the threshing drum. Therefore, by aligning the positioning sleeve 1 with the rear connecting shaft of the threshing drum, the fixed position of the rear crossbeam on the mounting frame can be determined relatively accurately, thereby indirectly confirming the precise installation position of the reversing gearbox relative to the threshing drum. During installation, the fixed position of the rear crossbeam on the mounting frame can be conveniently adjusted using the reversing gearbox positioning fixture 10 (mounting base 3) assembled to the rear connecting shaft of the threshing drum as a reference, without relying on the precise relative position accuracy between the rear crossbeam and the mounting frame determined during the design and manufacturing of the components. Even if the two side walls of the mounting frame used to fix the rear crossbeam deform due to welding, etc., it will not affect the relative position between the fixed rear crossbeam and the threshing drum, thus reliably ensuring the coaxiality between the power output shaft of the reversing gearbox and the rear connecting shaft of the threshing drum after installation.

[0043] In this design, the positioning sleeve 1 of the reversing box positioning fixture 10 may have an internal spline 11 formed at one end for assembly to the rear connecting shaft of the threshing drum, and an external spline may be formed on the rear connecting shaft of the threshing drum. Therefore, in step S1, the positioning sleeve 1 can be assembled to the rear connecting shaft of the threshing drum by engaging the internal spline 11 of the positioning sleeve 1 with the external spline of the rear connecting shaft. With this configuration, since the assembly method between the reversing box positioning fixture 10 and the threshing drum during installation is similar to the transmission connection method between the reversing box and the threshing drum, unnecessary wear on the positioning sleeve 1 of the reversing box positioning fixture 10 or the rear connecting shaft of the threshing drum can be effectively reduced or avoided. Furthermore, it ensures a good transmission connection between the reversing box and the rear connecting shaft of the threshing drum after installation, reducing the risk of the threshing drum seizing up or becoming unable to rotate after a period of operation and the risk of damage to the transmission connection structure.

[0044] Furthermore, mounting bosses 31 are formed at the corners of the bottom surface of the mounting base 3 of the commutator positioning fixture 10. Compared to a flat bottom surface, the commutator positioning fixture 10, supported on the rear crossbeam by the mounting bosses 31 formed on the bottom surface of the mounting base 3, can effectively reduce the gap error after the rear crossbeam and the commutator positioning fixture 10 are fixed together by reducing the contact area. This allows the commutator positioning fixture 10 and the top surface of the rear crossbeam to fit together fully, which is beneficial for accurately determining the fixed position of the rear crossbeam to the mounting frame. The mounting bosses 31 can each have fastener mounting holes 32, through which fasteners, such as bolts, can pass and detachably fix the rear crossbeam and the commutator positioning fixture 10 together, thereby determining the fixed position of the rear crossbeam to the mounting frame.

[0045] In the preferred embodiment illustrated, the commutator positioning fixture 10 further includes a pair of support plates 2 disposed on the mounting base 3. The pair of support plates 2 are arranged at intervals from each other along the extending direction of the positioning sleeve 1. The positioning sleeve 1 is fixed to the support plates 2 and is fixed at a distance from the mounting base 3. Thus, the height of the positioning sleeve 1 on the support plates 2 can be set according to the designed installation height of the commutator's power output shaft, thereby adapting it to the installation of the commutator.

[0046] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method for installing a reversing box in a harvester, characterized in that, Includes the following steps: S1. The positioning sleeve (1) of the reversing box positioning fixture (10) is assembled onto the rear connecting shaft of the threshing drum. The reversing box positioning fixture (10) includes a mounting base (3). Mounting bosses (31) are formed at the corners of the bottom surface of the mounting base (3). Fastener mounting holes (32) are formed at the positions of the mounting base (3) corresponding to the mounting bosses (31). At least two support plates (2) are provided on the mounting base (3) and are spaced apart from each other along the extension direction of the positioning sleeve (1). The positioning sleeve (1) is fixed on the support plate (2) and is fixed to be spaced apart from the mounting base (3). S2. Adjust the height of the rear crossbeam so that the rear crossbeam is supported on the mounting boss (31), and use fasteners to pass through the fastener mounting holes (32) and fix the rear crossbeam and the reversing box positioning fixture (10) to each other. When the rear crossbeam and the reversing box positioning fixture (10) are fixed to each other, the distance between the center line of the positioning sleeve (1) and the top surface of the rear crossbeam is d1. S3. Fix both ends of the rear crossbeam to the mounting frame; S4. Remove the fasteners connecting the rear crossbeam and the reversing box positioning fixture (10) and remove the reversing box positioning fixture (10); S5. Hoist and fix the reversing box to the rear crossbeam, and drive the power output shaft of the reversing box to the rear connecting shaft of the threshing drum. When the reversing box is fixed to the rear crossbeam, the distance between the center line of the power output shaft of the reversing box and the top surface of the rear crossbeam is d2, where d1 is 1.1mm-2.5mm smaller than d2.

2. The method for installing a reversing box for a harvester according to claim 1, characterized in that, An inner spline (11) is formed on the inner peripheral wall of the positioning sleeve (1), and an outer spline is formed on the outer peripheral wall of the rear connecting shaft of the threshing drum. In step S1, the positioning sleeve (1) is assembled onto the rear connecting shaft of the threshing drum by making the inner spline (11) cooperate with the outer spline.

3. The method for installing a reversing box for a harvester according to claim 2, characterized in that, In step S5, the power output shaft of the reversing box is connected to the rear connecting shaft of the threshing drum by installing internal spline sprockets at opposite ends of the power output shaft of the reversing box and the rear connecting shaft of the threshing drum, and connecting double-row chains to the internal spline sprockets.

4. The method for installing a reversing box for a harvester according to claim 1, characterized in that, In step S3, the rear crossbeam is fixed to the mounting frame and extends in the horizontal direction.

5. The method for installing a reversing box for a harvester according to claim 1, characterized in that, The mounting frame has a mounting groove. In step S3, both ends of the rear crossbeam are fixed to the mounting groove by fastening bolts. And / or, in step S5, the reversing box is fixed to the rear crossbeam by fastening bolts.

6. A method for producing a harvester, characterized in that, The production method includes a switch box installation step performed using the switch box installation method according to any one of claims 1 to 5.

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