Transmission mechanism, steering control device and agricultural machine

Abstract

The invention discloses a transmission mechanism, a steering control device and agricultural machinery, and the transmission mechanism comprises a transmission main shaft which comprises a main shaft main body, and a first limiting part and a second limiting part which are arranged at intervals are arranged outside the main shaft main body; the first bearing and the second bearing are arranged outside the main shaft body in a sleeving mode, and the opposite sides of the first bearing and the second bearing abut against the first limiting part and the second limiting part correspondingly; the main machine shell is provided with a supporting shaft sleeve, a mounting through cavity is formed in the main machine shell, a third limiting part protruding inwards is arranged in the mounting through cavity, and the opposite sides of the first bearing and the second bearing abut against the two ends of the third limiting part correspondingly, so that the first bearing and the second bearing are fixed between the supporting shaft sleeve and the main shaft body. And the transmission main shaft is rotationally mounted in the main machine shell. According to the transmission mechanism, the machining difficulty and the assembling difficulty of the main machine shell can be reduced, and the rotating stability of the main shaft can be guaranteed.

Description

Technical Field

[0001] The present application relates to the field of mechanical transmission technology, and in particular to a transmission mechanism, a steering control device and an agricultural machine. Background Art

[0002] With the development of social science and technology, automatic driving of agricultural machinery has become the main trend of agricultural machinery development. Automatic driving agricultural machinery is integrated with a steering control device. The housing of the steering control device is provided with a control module, a power device and a transmission device, etc. The transmission device is connected to the steering shaft of the agricultural machinery, and the operation of the power device is automatically controlled by the control module, so that the power device drives the steering shaft to rotate through the transmission device, thereby realizing the function of automatic steering control. However, the existing steering control device has certain defects: the upper and lower ends of the main shaft of the transmission device are respectively rotatably installed through the upper bearing and the lower bearing, and the upper bearing and the lower bearing are respectively fixed through two different housings, and the coaxiality of the upper bearing and the lower bearing installation has an important influence on the stability of the main shaft rotation. In order to ensure the coaxiality of the upper bearing and the lower bearing, the processing accuracy and splicing accuracy of the two housings supporting the upper bearing and the lower bearing are put forward with higher requirements, resulting in the problems that the rotation stability of the main shaft of the existing steering control device is difficult to ensure and the housing is difficult to process. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide a transmission mechanism, a steering control device and an agricultural machine, which can solve the above-mentioned problems existing in the prior art.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] On the one hand, a transmission mechanism is provided, comprising:

[0006] The transmission main shaft comprises a main shaft body, and a first limiting part and a second limiting part are arranged alternately outside the main shaft body;

[0007] A first bearing and a second bearing are sleeved outside the main shaft body, and opposite sides of the first bearing and the second bearing abut against the first limiting portion and the second limiting portion respectively;

[0008] The main housing has a supporting sleeve with an installation cavity formed therein. A third limiting portion protruding inward is provided in the installation cavity. The facing sides of the first bearing and the second bearing respectively abut against the two ends of the third limiting portion so that the first bearing and the second bearing are fixed between the supporting sleeve and the main shaft body, thereby realizing the rotational installation of the transmission main shaft in the main housing.

[0009] Optionally, the first limiting portion and / or the second limiting portion is detachably mounted on the main shaft body.

[0010] Optionally, the transmission main shaft also includes a driven gear fixed on the main shaft body, and the first limiting portion is closer to the driven gear than the second limiting portion; the first limiting portion is a structure integrally formed on the main shaft body, and the second limiting portion is a structure detachably mounted on the main shaft body.

[0011] Optionally, an annular groove is provided on the main shaft body corresponding to the installation position of the second limiting portion, and the second limiting portion is a retaining spring clamped in the annular groove.

[0012] Optionally, the main housing includes an upper shell and a lower shell which are arranged up and down, and the supporting sleeve is integrally formed with the upper shell or the lower shell.

[0013] Optionally, one of the upper shell and the lower shell on which the supporting sleeve is provided is made of metal material, and the other is made of plastic material.

[0014] Optionally, the main housing includes an upper shell, a middle shell and a lower shell arranged from top to bottom, and the supporting sleeve is integrally formed with the upper shell, the middle shell or the lower shell.

[0015] Optionally, among the upper shell, the middle shell and the lower shell, the one provided with the supporting sleeve is made of metal, and the other two are made of plastic.

[0016] On the other hand, a steering control device is provided, including a driving mechanism, a control unit and a transmission mechanism, wherein the control unit is electrically connected to the driving mechanism, and the driving mechanism is transmission-connected to the transmission mechanism.

[0017] On the other hand, an agricultural machine is provided, comprising a steering wheel, a steering shaft and the above-mentioned steering control device, wherein the steering wheel and the steering shaft are respectively connected to a transmission main shaft in the steering control device.

[0018] The beneficial effects of the present application are as follows: the present invention provides a transmission mechanism, a steering control device and an agricultural machine, wherein a support sleeve capable of supporting the first bearing and the second bearing at the same time is provided in the main engine housing, and the main engine housing completely supports the main axis on the support sleeve, so during processing, it is only necessary to ensure the processing accuracy of the support sleeve itself. Obviously, compared with the processing difficulty of the coaxiality of multiple openings on multiple workpieces, the processing difficulty of the coaxiality of the openings on a single workpiece is lower, and it is not affected by the splicing accuracy of multiple workpieces in the later stage. Therefore, the transmission mechanism of the present scheme is conducive to reducing the processing difficulty and assembly difficulty of the main engine housing, and is also conducive to ensuring the stability of the main axis rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present application is further described in detail below based on the drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of the transmission mechanism described in the embodiment of the present application;

[0021] Figure 2 A longitudinal sectional view of the transmission mechanism described in the embodiment of the present application;

[0022] Figure 3 This is a schematic diagram of the structure of the lower shell described in the embodiment of the present application;

[0023] Figure 4 This is a schematic diagram of the structure of the transmission main shaft according to an embodiment of the present application;

[0024] Figure 5 A longitudinal sectional view of the transmission main shaft according to an embodiment of the present application;

[0025] Figure 6 This is a schematic diagram of the structure of the steering control device according to an embodiment of the present application;

[0026] Figure 7 This is an exploded schematic diagram of the steering control device according to an embodiment of the present application;

[0027] Figure 8 This is a longitudinal cross-sectional view of the steering control device described in an embodiment of the present application.

[0028] In the figure:

[0029] 1. Main body housing; 11. Lower housing; 12. Upper housing; 13. Housing sealing ring; 14. Support sleeve; 141. Third limiting part; 2. Transmission main shaft; 21. Main shaft body; 211. Annular groove; 22. Driven gear; 23. First limiting part; 24. Second limiting part; 3. Driving mechanism; 31. Driving motor; 32. Driving gear; 51. First bearing; 52. Second bearing; 6. Trigger mechanism; 7. Control unit. DETAILED DESCRIPTION

[0030] In order to make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0031] In the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] The existing steering control device has certain defects: the upper and lower ends of the main shaft of the transmission device are rotatably installed by the upper bearing and the lower bearing respectively, and the upper bearing and the lower bearing are respectively fixed by two different shells, and the coaxiality of the installation of the upper bearing and the lower bearing has an important influence on the stability of the main shaft rotation. In order to ensure the coaxiality of the upper bearing and the lower bearing, higher requirements are put forward on the processing accuracy and splicing accuracy of the two shells supporting the upper bearing and the lower bearing, resulting in the problems that the rotation stability of the main shaft of the existing steering control device is difficult to ensure and the processing difficulty of the casing is high.

[0034] For example, Chinese patent CN218477550U provides a steering control device, which includes a fixed part, a power device, a clutch assembly and a transmission device. The fixed part includes a middle shell and a shell top cover and a shell bottom cover respectively located on the upper and lower sides of the middle shell. The third transmission part (i.e., the main shaft) is provided with an upper bearing and a lower bearing, the upper bearing is fixed to the middle shell, and the lower bearing is fixed to the shell bottom cover. As a result, when processing the middle shell and the shell bottom cover, it is necessary to strictly control the processing accuracy and splicing accuracy of the middle shell and the shell bottom cover to ensure the coaxiality of the upper bearing and the lower bearing installation. If the processing accuracy of one of the middle shell and the shell bottom cover is insufficient, or there is a deviation in the splicing of the two, or after long-term use, the connecting parts of the middle shell and the shell bottom cover become loose, there will be problems with the stability of the rotation of the lead third transmission part.

[0035] In order to overcome the above defects, the present embodiment provides a transmission mechanism, in which the support of the transmission main shaft 2 is placed on a separate component. Compared with the traditional form of support by two independent components, the processing accuracy of one component is easier to ensure, and there is no need to consider the problem of poor assembly accuracy, which not only facilitates the processing of components, but also improves the stability of the product.

[0036] like Figure 1-3 As shown, the transmission mechanism of this embodiment includes a transmission main shaft 2, a first bearing 51, a second bearing 52 and a main body housing 1. The transmission main shaft 2 includes a main shaft body 21, and the main shaft body 21 is provided with a first limiting portion 23 and a second limiting portion 24 arranged alternately. The first bearing 51 and the second bearing 52 are both sleeved outside the main shaft body 21, and the opposite sides of the first bearing 51 and the second bearing 52 are respectively abutted against the first limiting portion 23 and the second limiting portion 24, and the first bearing 51 and the second bearing 52 are limited by the first limiting portion 23 and the second limiting portion 24. 1 and the second bearing 52 move away from each other; the main body housing 1 has a supporting sleeve 14, an installation cavity is formed inside the supporting sleeve 14, and a third limiting portion 141 protruding inward is provided in the installation cavity. The facing sides of the first bearing 51 and the second bearing 52 respectively abut against the two ends of the third limiting portion 141, and the annular boss is used to limit the facing movement of the first bearing 51 and the second bearing 52, so that the first bearing 51 and the second bearing 52 are fixed between the supporting sleeve 14 and the main shaft body 21, so as to realize the rotation installation of the transmission main shaft 2 in the main body housing 1.

[0037] When in use, a driving mechanism 3 capable of driving the transmission main shaft 2 to rotate is also installed in the main housing 1. The transmission main shaft 2 serves as an output shaft of the transmission mechanism of this embodiment to output driving force to the external driven part. Its input end is connected to the driving mechanism 3, and the output end is connected to the driven part. The driving mechanism 3 drives the transmission main shaft 2 to rotate, and the transmission main shaft 2 drives the driven part to operate.

[0038] Regarding the rotating installation structure of the transmission main shaft 2 , a first bearing 51 and a second bearing 52 are spaced apart on the main shaft body 21 . The reliability of the installation of the first bearing 51 and the second bearing 52 determines the stability of the installation of the transmission main shaft 2 .

[0039] In order to realize that a component on the main body housing 1 supports the first bearing 51 and the second bearing 52 separately, refer to Figure 2 The main body housing 1 has a support sleeve 14 that can be simultaneously sleeved onto the outside of the first bearing 51 and the second bearing 52. During product processing, it is only necessary to ensure the accuracy of the inner hole of the support sleeve 14 to ensure the coaxiality of the installation of the first bearing 51 and the second bearing 52.

[0040] In order to realize the reliable installation of the transmission main shaft 2, a third limiting portion 141 is arranged in the support sleeve 14, and the facing sides of the first bearing 51 and the second bearing 52 are respectively in contact with the third limiting portion 141; on the transmission main shaft 2, the first limiting portion 23 and the second limiting portion 24 are arranged at intervals, and the opposite sides of the first bearing 51 and the second bearing 52 are respectively in contact with the first limiting portion 23 and the second limiting portion 24; thereby, the first bearing 51 is stably limited between the first limiting portion 23 and the third limiting portion 141, and the second bearing 52 is stably limited between the second limiting portion 24 and the third limiting portion 141. That is, the purpose of fixing the first bearing 51 and the second bearing 52 between the support sleeve 14 and the transmission main shaft 2 is achieved. It can be understood that the first bearing 51 and the second bearing 52 respectively have a relatively rotatable bearing inner ring and a bearing outer ring, the bearing inner ring is fixedly connected to the transmission main shaft 2, and the bearing outer ring is fixedly connected to the support sleeve 14.

[0041] In summary, based on the transmission mechanism of this embodiment, a support sleeve 14 capable of supporting the first bearing 51 and the second bearing 52 at the same time is provided in the main housing 1. The support of the main housing 1 to the main shaft completely falls on the support sleeve 14. Therefore, during processing, it is only necessary to ensure the processing accuracy of the support sleeve 14 itself. Obviously, compared with the processing difficulty of the coaxiality of multiple openings on multiple workpieces, the processing difficulty of the coaxiality of the opening on a single workpiece is lower, and it is not affected by the splicing accuracy of multiple workpieces in the later stage. Therefore, the transmission mechanism of this scheme is conducive to reducing the processing difficulty and assembly difficulty of the main housing 1, and is also conducive to ensuring the stability of the main shaft rotation.

[0042] In one embodiment, the first limiting portion 23 and / or the second limiting portion 24 are detachably mounted on the spindle body 21 .

[0043] Specific, combined Figure 2 The first bearing 51 and the second bearing 52 need to be installed on both sides of the third limiting portion 141, and also need to be installed between the first limiting portion 23 and the second limiting portion 24. In this solution, at least one of the first limiting portion 23 and the second limiting portion 24 is configured as a detachable structure, which can facilitate the disassembly and assembly of the first bearing 51 and the second bearing 52.

[0044] For example, the second limiting portion 24 is configured to be detachable. Before assembly, the first bearing 51 and the second bearing 52 are respectively installed on both sides of the third limiting portion 141, and then the main shaft body 21 successively passes through the first bearing 51 and the second bearing 52, so that after the first limiting portion 23 abuts against the first bearing 51, the second limiting portion 24 is installed on the main shaft body 21.

[0045] Reference Figure 1The transmission main shaft 2 also includes a driven gear 22 fixed on the main shaft body 21, and the first limiting portion 23 is closer to the driven gear 22 than the second limiting portion 24; the first limiting portion 23 is a structure integrally formed on the main shaft body 21, and the second limiting portion 24 is a structure detachably mounted on the main shaft body 21.

[0046] Specifically, the driving mechanism 3 includes a connected driving motor 31 and a driving gear 32, and the driven gear 22 of the transmission main shaft 2 can be meshed with the driving gear 32. The driving motor 31 drives the driving gear 32 to rotate, and the transmission main shaft 2 is driven to rotate through the driven gear 22. The combination of the driven gear 22 and the main shaft body 21 can be an assembled structure or an integrally formed structure.

[0047] Compared with the second limiting portion 24, the first limiting portion 23 is closer to the driven gear 22, so the first limiting portion 23 is directly integrally formed on the main shaft body 21, which is specifically a shoulder formed on the main shaft body 21, and the diameter of the shoulder is larger than the inner diameter of the first bearing 51, so it can provide a limit for the first bearing 51. The first limiting portion 23 is integrally formed on the main shaft body 21, which can reduce the number of parts of the product and save the later assembly work. Importantly, since the driven gear 22 is located on the side of the first limiting portion 23 facing away from the first bearing 51, the first bearing 51 can be inserted from the end close to the main shaft body 21 and close to the second limiting portion 24, and the driven gear 22 and the fixed first limiting portion 23 will not interfere with the problem of the first bearing 51 and the second bearing 52 being sleeved on the main shaft body 21. Accordingly, the first limiting portion 23 is fixedly arranged, and the second limiting portion 24 is detachably arranged, which is convenient for product assembly.

[0048] Regarding the arrangement of the second limiting portion 24, in one embodiment, refer to Figure 2 and Figure 4 An annular groove 211 is provided on the main shaft body 21 at the installation position corresponding to the second limiting portion 24 , and the second limiting portion 24 is a retaining spring mounted in the annular groove 211 .

[0049] Specifically, the retaining spring itself is elastic and has an opening on one side, which can be elastically stretched during installation so that it can be mounted on the main shaft body 21; after moving to the position of the annular groove 211, the retaining spring returns to its original shape under the action of its own elastic force and is clamped into the annular groove 211, thereby achieving the purpose of limiting the second bearing 52.

[0050] The second limiting portion 24 is formed of a retaining spring, which has the advantage of being easy to assemble and disassemble.

[0051] In one embodiment, referring to Figure 6 The main body housing 1 includes an upper shell 12 and a lower shell 11 which are arranged up and down, and the supporting sleeve 14 is integrally formed with the upper shell 12 or the lower shell 11.

[0052] Specifically, the structure of assembling the upper shell 12 and the lower shell 11 is adopted to facilitate the installation of various structural parts inside the host housing 1. The support sleeve 14 is integrally formed with the upper shell 12 or the lower shell 11, and the support sleeve 14 can be directly supported by the upper shell 12 or the lower shell 11, which can not only ensure the reliability of the support sleeve 14, but also save the assembly process between the support sleeve 14 and the upper shell 12 or the lower shell 11.

[0053] Reference Figure 7 In order to ensure the sealing performance of the host housing 1, a housing sealing ring 13 is provided between the upper housing 12 and the lower housing 11.

[0054] In a further embodiment, one of the upper shell 12 and the lower shell 11 on which the support sleeve 14 is disposed is made of metal material, and the other is made of plastic material.

[0055] Specifically, the support sleeve 14 is an important load-bearing component, and the structure integrated with it is made of metal material to ensure sufficient strength and structural reliability. The other shell is a non-supporting component that only provides decoration and covering functions, and is made of plastic material to reduce material costs and reduce the weight of the shell.

[0056] Preferably, the support sleeve 14 is arranged on the lower shell 11, the lower shell 11 is arranged to be made of metal, and the upper shell 12 is arranged to be made of plastic. Because other devices (such as the driving mechanism 3) need to be installed on the lower shell 11, the lower shell 11 is made of metal, which can provide better support performance and ensure the reliability of the installation of other devices.

[0057] In another embodiment, the main housing 1 includes an upper shell 12 , a middle shell and a lower shell 11 arranged from top to bottom, and the supporting sleeve 14 is integrally formed with the upper shell 12 , the middle shell or the lower shell 11 .

[0058] Similarly, the support sleeve 14 is integrally formed with the upper shell 12, the middle shell or the lower shell 11, and the upper shell 12, the middle shell or the lower shell 11 can be directly used to support the support sleeve 14, which can not only ensure the reliability of the support sleeve 14, but also save the assembly process between the support sleeve 14 and the upper shell 12 or the lower shell 11.

[0059] In a further embodiment, among the upper shell 12 , the middle shell and the lower shell 11 , the one provided with the supporting sleeve 14 is made of metal, and the other two are made of plastic.

[0060] Similarly, specifically, the support sleeve 14 is an important load-bearing component, and the structure integrated with it is made of metal material to ensure sufficient strength and structural reliability. The other two shells are non-main supporting parts and are made of plastic material to reduce material cost and reduce shell weight.

[0061] In another embodiment, the support sleeve 14 can be provided as an independent part, and later fixed to the main body housing 1 by welding, threaded connection, screw locking, etc.

[0062] On the other hand, referring to Figure 7-8 , provides a steering control device, including a driving mechanism 3, a control unit 7 and a transmission mechanism, the control unit 7 is electrically connected to the driving mechanism 3, and the driving mechanism 3 is transmission-connected to the transmission mechanism.

[0063] Specifically, the control unit 7 can control the operation of the driving mechanism 3, and then control the operation of the transmission mechanism, so as to achieve the purpose of automatic control of the external drive.

[0064] In order to facilitate the control of the control unit 7, a trigger mechanism 6 extending to the inside is provided on one side of the host housing 1. The user can manually trigger the electronic switch on the control unit 7 through the trigger mechanism 6 to achieve relevant control.

[0065] Similarly, by adopting the above transmission mechanism, the steering control device of this embodiment has the advantages of low processing difficulty and good stability.

[0066] On the other hand, an agricultural machine is provided, comprising a steering wheel, a steering shaft and the above-mentioned steering control device, wherein the steering wheel and the steering shaft are respectively connected to the transmission main shaft 2 in the steering control device.

[0067] Specifically, the agricultural machine of this embodiment can provide the functions of manual steering control and automatic steering control. In manual control, the steering wheel is manually operated, and the steering wheel drives the steering shaft to rotate through the transmission main shaft 2. In automatic control, the control unit 7 controls the driving mechanism 3 to operate, and drives the steering shaft to rotate automatically through the transmission main shaft 2.

[0068] Similarly, by adopting the above steering control device, the agricultural machine of this embodiment has the advantages of low processing difficulty and good stability.

[0069] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., and other directions or positional relationships are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of this application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0070] In the description of this specification, the description with reference to the terms "an embodiment", "example", 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 present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0071] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0072] The technical principles of the present application are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present application and cannot be interpreted as limiting the scope of protection of the present application in any way. Based on the explanations herein, those skilled in the art can think of other specific implementation methods of the present application without creative work, and these methods will fall within the scope of protection of the present application.

Claims

1. A transmission mechanism, characterized in that: include: A transmission main shaft (2) comprises a main shaft body (21), wherein the main shaft body (21) is provided with a first limiting portion (23) and a second limiting portion (24) arranged alternately. A first bearing (51) and a second bearing (52) are sleeved outside the main shaft body (21), and opposite sides of the first bearing (51) and the second bearing (52) are respectively in contact with the first limiting portion (23) and the second limiting portion (24); The main housing (1) has a support sleeve (14) having an installation cavity formed therein, wherein a third limiting portion (141) protruding inward is provided in the installation cavity, and the facing sides of the first bearing (51) and the second bearing (52) respectively abut against two ends of the third limiting portion (141), so that the first bearing (51) and the second bearing (52) are fixed between the support sleeve (14) and the main shaft body (21), thereby realizing the rotatable installation of the transmission main shaft (2) in the main housing (1).

2. The transmission mechanism according to claim 1, characterized in that: The first limiting portion (23) and / or the second limiting portion (24) are detachably mounted on the main shaft body (21).

3. The transmission mechanism according to claim 2, characterized in that: The transmission main shaft (2) further comprises a driven gear (22) fixed on the main shaft body (21); the first limiting portion (23) is closer to the driven gear (22) than the second limiting portion (24); the first limiting portion (23) is a structure integrally formed on the main shaft body (21), and the second limiting portion (24) is a structure detachably mounted on the main shaft body (21).

4. The transmission mechanism according to claim 3, characterized in that: An annular groove (211) is provided on the main shaft body (21) at a mounting position corresponding to the second limiting portion (24); the second limiting portion (24) is a retaining spring mounted in the annular groove (211).

5. The transmission mechanism according to claim 1, characterized in that: The main body housing (1) comprises an upper shell (12) and a lower shell (11) arranged one above the other, and the support sleeve (14) is integrally formed with the upper shell (12) or the lower shell (11).

6. The transmission mechanism according to claim 5, characterized in that: Of the upper shell (12) and the lower shell (11), one of the upper shell (12) and the lower shell (11) on which the support sleeve (14) is provided is made of metal material, and the other is made of plastic material.

7. The transmission mechanism according to claim 1, characterized in that: The main body housing (1) comprises an upper shell (12), a middle shell and a lower shell (11) arranged from top to bottom, and the supporting shaft sleeve (14) is integrally formed with the upper shell (12), the middle shell or the lower shell (11).

8. The transmission mechanism according to claim 7, characterized in that: Among the upper shell (12), the middle shell and the lower shell (11), the one provided with the supporting shaft sleeve (14) is made of metal, and the other two are made of plastic.

9. A steering control device, characterized in that: The invention comprises a driving mechanism (3), a control unit (7) and a transmission mechanism, wherein the transmission mechanism is the transmission mechanism described in any one of claims 1 to 8, the control unit (7) is electrically connected to the driving mechanism (3), and the driving mechanism (3) is in transmission connection with the transmission mechanism.

10. An agricultural machine, characterized in that: It comprises a steering wheel, a steering shaft and the steering control device according to claim 9, wherein the steering wheel and the steering shaft are respectively connected to a transmission main shaft (2) in the steering control device.

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