A dry field waterproof type steering drive axle structure for paddy field operation and a harvester

Abstract

The utility model relates to a dry field waterproof type turning drive axle structure and harvester for paddy field operation belongs to agricultural machinery equipment field, and turning drive axle structure includes main reducer assembly, steering cylinder assembly and wheel edge speed reducer assembly, main reducer assembly has the input shaft through its casing, and the input shaft is sealed through first sealing structure between casing, and the both ends of main reducer assembly casing are rotatory connected with a wheel edge speed reducer assembly respectively, and the both ends of main reducer assembly casing are sealed through second sealing structure between the wheel edge speed reducer assembly of corresponding end, and main reducer assembly has the universal joint output shaft through both ends, and the axle head of universal joint output shaft is connected with the main shaft of wheel edge speed reducer assembly, and steering cylinder assembly is installed on the casing and is connected with the wheel edge speed reducer assembly of both ends respectively. Advantage: solved the problem that traditional dry field type drive axle cannot be applied to paddy field operation working condition, improved the sealing performance and reliable performance of dry field type drive axle.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery and equipment, and in particular to a dryland waterproof steering drive axle structure and harvester for paddy field operations. Background Technology

[0002] Traditional agricultural machinery operating in paddy fields is typically equipped with high-clearance paddy field steering drive axles (also known as portal axles). These axles feature high clearance and good waterproof sealing performance, making them suitable for paddy field operations in southern regions. Agricultural machinery operating in dry fields is equipped with dry field drive axles (also known as planetary axles). While these axles are compact and relatively cheaper than paddy field axles with the same load-bearing capacity, their lower clearance means they become submerged in mud and water when in paddy fields. This causes rapid seal failure, leading to oil leaks, mud intrusion, and other malfunctions. Therefore, this type of drive axle is unsuitable for paddy field operations.

[0003] In recent years, users operating in paddy fields in southern China have reported that during cultivation, the sides of the drive axle in paddy fields suffer from severe scrambling of seedlings. However, due to the structural limitations of the paddy field axle, this problem cannot be solved. Many users can only use dry-field models for inter-row cultivation in paddy fields. However, after the dry-field axle enters the paddy field, it experiences malfunctions such as oil leakage and mud intrusion, which seriously affects the service life of the drive axle.

[0004] Therefore, it is necessary to develop a waterproof steering drive axle structure for dryland operations in paddy fields to solve the above-mentioned technical problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a waterproof steering drive axle structure for dryland operations and a harvester for paddy field operations, which effectively overcomes the defects of the prior art.

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

[0007] A waterproof steering drive axle structure for paddy field operations includes a main reducer assembly, a steering cylinder assembly, and a wheel-side reducer assembly. The main reducer assembly has an input shaft passing through its housing, and the input shaft is sealed to the housing by a first sealing structure. Both ends of the main reducer assembly housing are rotatably connected to one of the wheel-side reducer assemblies. Both ends of the main reducer assembly housing are sealed to the corresponding wheel-side reducer assemblies by a second sealing structure. The main reducer assembly has a universal joint output shaft passing through both ends, and the shaft end of the universal joint output shaft is connected to the main shaft of the wheel-side reducer assembly. The steering cylinder assembly is mounted on the housing and is connected to the wheel-side reducer assemblies at both ends.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the aforementioned main reducer assembly includes a central axle housing, a main reducer housing assembly, and a main reducer unit assembly. An opening is provided on one side of the middle portion of the central axle housing. The main reducer housing assembly is assembled into the opening. The main reducer unit assembly is installed in the central axle housing. The main reducer unit assembly includes the aforementioned input shaft. The input shaft passes through the end port of the main reducer housing assembly away from the central axle housing. The aforementioned first sealing structure is provided between the input shaft and the end port of the main reducer housing assembly away from the central axle housing. The two ends of the central axle housing are respectively rotatably connected to the aforementioned wheel-side reducer assembly and are respectively sealed by the aforementioned second sealing structure.

[0010] Furthermore, a first oil seal seat ring is fitted on the input shaft at the end of the main reducer housing assembly away from the central axle housing. The first sealing structure includes a main reducer oil seal and a main reducer dust cover. The main reducer oil seal is enclosed outside the first oil seal seat ring and contacts the inner wall of the end of the main reducer housing assembly away from the central axle housing. The main reducer dust cover is installed on the inner wall of the end of the main reducer housing assembly away from the central axle housing and is close to the first oil seal seat ring.

[0011] Furthermore, the output shaft of the universal joint is sealed to the inner wall of the corresponding end of the central axle housing by a third sealing structure.

[0012] Furthermore, the aforementioned third sealing structure includes a bridge housing half-shaft mudguard and a bridge housing half-shaft oil seal. Second oil seal seat rings are respectively installed on the inner walls of both ends of the aforementioned central bridge housing. The inner wall of the aforementioned second oil seal seat ring is equipped with a deep groove ball bearing that mates with the aforementioned universal joint output shaft. The aforementioned bridge housing half-shaft oil seal and bridge housing half-shaft mudguard are sequentially and alternately installed on one end of the inner wall of the aforementioned second oil seal seat ring near the aforementioned wheel-side reducer assembly, and both are in contact with the surface of the aforementioned universal joint output shaft.

[0013] Furthermore, universal joint receiving cavities are provided at both ends of the aforementioned central axle housing. The shaft end of the aforementioned universal joint output shaft is connected to one end of the main shaft of the aforementioned wheel-side reducer assembly in the aforementioned universal joint receiving cavity. The aforementioned universal joint receiving cavity is rotatably connected to the aforementioned wheel-side reducer assembly, and the two are sealed by the aforementioned second sealing structure.

[0014] Furthermore, one end of the housing of the aforementioned wheel-side reducer assembly is provided with a steering knuckle housing that is rotatably assembled therewith. The steering knuckle housing is sleeved outside the universal joint receiving cavity at the corresponding end. An annular steering cover is mounted on the steering knuckle housing, passing through its side wall and extending into the interior. The outer surface of the universal joint receiving cavity is provided with an annular groove. The steering cover is embedded in the annular groove and is rotatably assembled with the annular groove through a spherical bearing. The steering cover and the inner wall of the groove opening are sealed by the aforementioned second sealing structure.

[0015] Furthermore, the aforementioned second sealing structure includes a steering cover mudguard and a steering cover sealing ring. The steering cover sealing ring is assembled between the steering cover and the inner wall of the annular groove, and the steering cover mudguard is assembled at the opening of the annular groove.

[0016] Furthermore, the inner wall of the steering knuckle housing is fitted with a half-shaft bushing, and the outer side of the main shaft of the wheel-side reducer assembly is fitted with a drive shaft protective sleeve. The drive shaft protective sleeve and the half-shaft bushing are axially slidably assembled. The inner wall of the end port of the steering knuckle housing near the universal joint receiving cavity is sealed with the drive shaft protective sleeve by a second half-shaft oil seal. The second half-shaft oil seal is fitted to the inner wall of the port of the steering knuckle housing and makes sealing contact with the drive shaft protective sleeve.

[0017] The beneficial effects of this utility model are: it solves the problem that traditional dryland drive axles cannot be applied to paddy field operation conditions, and greatly improves the sealing performance and overall reliability of dryland drive axles. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the waterproof steering drive axle for dryland operations in paddy fields according to this utility model. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the overall structure of the waterproof steering drive axle for dryland operations in paddy fields according to this utility model. Figure 2 ;

[0020] Figure 3 This is a partial cross-sectional view of the main reducer assembly in the dryland waterproof steering drive axle structure for paddy field operations of this utility model.

[0021] Figure 4 for Figure 3 Enlarged view of the structure of section A in the middle;

[0022] Figure 5 This is a partial sectional view of the connection between the main reducer assembly and the wheel-side reducer assembly in the dryland waterproof steering drive axle structure for paddy field operations of this utility model.

[0023] Figure 6 for Figure 5 Enlarged view of the structure of section B;

[0024] Figure 7 for Figure 5 Enlarged view of the structure of section C;

[0025] Figure 8 for Figure 5 Enlarged view of the structure of section D in the middle.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1. Main reducer assembly; 2. Steering cylinder assembly; 3. Wheel-side reducer assembly; 11. Central axle housing; 12. Main reducer housing assembly; 41. Main reducer oil seal; 42. Main reducer dust cover; 51. Axle housing half-shaft mudguard; 52. Axle housing half-shaft oil seal; 61. Steering cover mudguard; 62. Steering cover seal ring; 111. Input shaft; 112. Universal joint output shaft; 113. Universal joint housing cavity; 311. Steering knuckle housing; 312. Steering cover; 313. Drive shaft protective sleeve; 314. Half-shaft oil seal; 1111. First oil seal seat ring; 1112. Second oil seal seat ring; 1113. Deep groove ball bearing; 3111. Half-shaft bushing. Detailed Implementation

[0028] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0029] Example 1

[0030] like Figure 1 , 2 As shown in Figures 3 and 5, the dryland waterproof steering drive axle structure for paddy field operations in this embodiment includes a main reducer assembly 1, a steering cylinder assembly 2, and a wheel-side reducer assembly 3. The main reducer assembly 1 has an input shaft 111 passing through its housing, and the input shaft 111 is sealed to the housing by a first sealing structure. The two ends of the housing of the main reducer assembly 1 are rotatably connected to one of the wheel-side reducer assemblies 3, respectively. The two ends of the housing of the main reducer assembly 1 are sealed to the corresponding wheel-side reducer assemblies 3 by a second sealing structure. The main reducer assembly 1 has a universal joint output shaft 112 passing through its two ends. The shaft head of the universal joint output shaft 112 is connected to the main shaft of the wheel-side reducer assembly 3 (represented by F in the figure). The steering cylinder assembly 2 is mounted on the housing and is connected to the wheel-side reducer assemblies 3 at both ends.

[0031] The dryland waterproof steering drive axle structure for paddy field operations in this embodiment uses a first sealing structure between the input shaft 111 of the main reducer assembly 1 and the housing to intercept large particles of mud, sand, weeds, and other foreign objects, preventing wear and sealing failures caused by foreign object intrusion. A second sealing structure is installed between the housing ends of the main reducer assembly 1 and the wheel-side reducer assembly 3 to further prevent premature wear and sealing failures caused by large particles of mud, sand, weeds, and other foreign objects. Overall, this structure solves the problem that traditional dryland drive axles cannot be used in paddy field operations, significantly improving the sealing performance and overall reliability of dryland drive axles. It also fundamentally solves the problems of insufficient sealing reliability in paddy field bridges during tillage operations and dryland bridges during paddy field operations, while simultaneously reducing overall vehicle manufacturing costs and increasing the service life and market maintenance costs of the drive axle.

[0032] It should be particularly emphasized that in this embodiment, the main reducer assembly 1, the steering cylinder assembly 2, and the wheel-side reducer assembly 3 are all existing technology products. The main difference is that, based on existing products, a first sealing structure and a second sealing structure with high sealing performance are adopted at the joint.

[0033] Preferably, the main reducer assembly 1 includes a central axle housing 11, a main reducer housing assembly 12, and a main reducer unit assembly. The central axle housing 11 has an opening on one side of its middle portion. The main reducer housing assembly 12 is assembled into the opening. The main reducer unit assembly is installed in the central axle housing 11. The main reducer unit assembly includes an input shaft 111. The input shaft 111 passes through the end port of the main reducer housing assembly 12 away from the central axle housing 11. A first sealing structure is provided between the input shaft 111 and the end port of the main reducer housing assembly 12 away from the central axle housing 11. The two ends of the central axle housing 11 are rotatably connected to the wheel-side reducer assembly 3 and are sealed by the second sealing structure. The central axle housing 11 has a large cavity in the middle section that accommodates the main reducer unit assembly. Both ends of the central housing have strip-shaped axle arms adapted to the universal joint output shaft 112. A first sealing structure is provided at the point where the input shaft 111 of the main reducer assembly 1 passes through the main reducer housing assembly 12 for sealing. More specifically, the main reducer unit assembly is a prior art product, including a differential assembly 131, a differential support bearing 132, a drive and driven spiral bevel gear assembly 133, a transmission bevel gear 134, and an input shaft 111. Differential support bearings 132 are mounted at both ends of the differential assembly 131, and are assembled with the main reducer housing assembly 12 via the differential support bearings 132. The drive and driven spiral bevel gear assembly 133 is mounted outside the differential assembly 131 and inside the differential assembly 131. The main reducer unit is connected to the drive gear and the universal joint output shafts 112 at both ends. One end of the input shaft 111 extends into the central axle housing 11 and is connected to the drive bevel gear 134. The drive bevel gear 134 meshes with the main and driven spiral bevel gear assembly 133. The other end of the input shaft 111 passes through the end port of the main reducer housing assembly 12 away from the central axle housing 11. One end of the input shaft 111 is rotatably assembled with the main reducer housing assembly 12 through spaced-apart input shaft front end support bearings and input shaft rear end support bearings. The structure of the main reducer unit assembly is prior art.

[0034] As a preferred implementation method, such as Figure 4 As shown, the input shaft 111 is fitted with a first oil seal seat ring 1111 at the end of the main reducer housing assembly 12 away from the central axle housing 11. The first sealing structure includes a main reducer oil seal 41 and a main reducer dust cover 42. The main reducer oil seal 41 is mounted outside the first oil seal seat ring 1111 and contacts the inner wall of the end of the main reducer housing assembly 12 away from the central axle housing 11. The main reducer dust cover 42 is mounted on the inner wall of the end of the main reducer housing assembly 12 away from the central axle housing 11 and is close to the first oil seal seat ring 1111.

[0035] In the above implementation scheme, the main reducer dust cover 42 can trap large particles of mud, sand, weeds, and other foreign objects, preventing premature wear and sealing failure of the main reducer oil seal 41 due to foreign object intrusion. Simultaneously, the main reducer oil seal 41 uses fluororubber material with superior wear resistance, extending the lifespan and preventing rapid wear of the seal lip caused by fine mud intrusion. Through the application of this combined structure, the mean time between leaks in the main reducer module has been successfully increased from 400 hours to over 1000 hours, significantly improving reliability.

[0036] In a preferred embodiment, the universal joint output shaft 112 and the corresponding end inner wall of the central bridge housing 11 are sealed by a third sealing structure.

[0037] In the above implementation scheme, the third sealing structure can intercept large particles of mud, sand, weeds and other foreign objects, preventing problems such as premature wear of parts and sealing failure caused by the intrusion of foreign objects.

[0038] As a preferred implementation method, such as Figure 6 As shown, the third sealing structure includes axle housing half-shaft mudguard 51 and axle housing half-shaft oil seal 52. The inner walls of both ends of the central axle housing 11 are respectively equipped with second oil seal seat rings 1112. The inner wall of the second oil seal seat ring 1112 is equipped with a deep groove ball bearing 1113 that fits with the universal joint output shaft 112. The axle housing half-shaft oil seal 52 and axle housing half-shaft mudguard 51 are sequentially and spaced apart on one end of the inner wall of the second oil seal seat ring 1112 near the wheel-side reducer assembly 3, and both are in contact with the surface of the universal joint output shaft 112.

[0039] In the above implementation scheme, the mudguard 51 of the axle housing half-shaft can trap large particles of mud, sand, weeds, and other foreign objects, preventing premature wear and sealing failure of the axle housing half-shaft oil seal 52 due to foreign object intrusion. Simultaneously, the axle housing half-shaft oil seal 52 uses fluororubber material with superior wear resistance, extending the lifespan and preventing rapid wear of the oil seal lip caused by fine mud intrusion. Through the application of this combined structure, the mean time between seal failures at this location has been successfully increased from 400 hours to over 1200 hours, achieving a reliability exceeding that of paddy field-specific drive axles.

[0040] In a preferred embodiment, the two ends of the central axle housing 11 are respectively provided with universal joint receiving cavities 113. The shaft end of the universal joint output shaft 112 is connected to one end of the main shaft of the wheel-side reducer assembly 3 in the universal joint receiving cavity 113. The universal joint receiving cavity 113 is rotatably connected to the wheel-side reducer assembly 3, and the two are sealed by the second sealing structure.

[0041] In the above implementation scheme, the assembly of the universal joint housing 113 and the wheel-side reducer assembly 3 enables better connection between the two ends of the central axle housing 11 and the wheel-side reducer assembly 3, and also provides space for the connection and rotation of the shaft head of the universal joint output shaft 112 and the main shaft of the wheel-side reducer assembly 3.

[0042] In this embodiment, one end of the housing of the aforementioned wheel-side reducer assembly 3 is provided with a steering knuckle housing 311 rotatably assembled therewith. The steering knuckle housing 311 is sleeved outside the universal joint receiving cavity 113 at the corresponding end. An annular steering pressure cap 312 is assembled on the steering knuckle housing 311, passing through its side wall and extending into its interior. The outer surface of the universal joint receiving cavity 113 is provided with an annular groove. The steering pressure cap 312 is embedded in the annular groove and rotatably assembled with the annular groove through a spherical bearing. The steering pressure cap 312 and the inner wall of the groove opening are sealed by the aforementioned second sealing structure. This second sealing structure can effectively prevent foreign objects from entering the annular groove through the steering pressure cap 312.

[0043] As a preferred implementation method, such as Figure 7 As shown, the second sealing structure includes a steering cover mudguard 61 and a steering cover sealing ring 62. The steering cover sealing ring 62 is assembled between the steering cover 312 and the inner wall of the annular groove, and the steering cover mudguard 61 is assembled at the opening of the annular groove.

[0044] In the above implementation scheme, the steering cap mudguard 61 can trap large particles of mud, sand, weeds, and other foreign objects, preventing premature wear and sealing failure of the internal oil seals due to foreign object intrusion. Simultaneously, the steering cap sealing ring 62 uses fluororubber material with superior wear resistance, extending the lifespan and preventing rapid wear of the oil seal lip caused by fine mud intrusion. Through the application of this combined structure, the mean time between seal failures at this location has been successfully increased from 600 hours to over 1500 hours, achieving a reliability exceeding that of paddy field-specific drive axles.

[0045] As a preferred implementation method, such as Figure 8 As shown, the inner wall of the steering knuckle housing 311 is fitted with a half-shaft bushing 3111, and the outer side of the main shaft of the wheel-side reducer assembly 3 is fitted with a drive shaft protective sleeve 313. The drive shaft protective sleeve 313 and the half-shaft bushing 3111 are axially slidably assembled. The inner wall of the end port of the steering knuckle housing 311 near the universal joint receiving cavity 113 is sealed with the drive shaft protective sleeve 313 by a second half-shaft oil seal 314. The second half-shaft oil seal 314 is assembled on the inner wall of the port of the steering knuckle housing 311 and is in sealing contact with the drive shaft protective sleeve 313.

[0046] In the above implementation scheme, a suitable transmission shaft protective sleeve 313 is added to the surface of the main shaft of the wheel-side reducer assembly 3 for protection, preventing wear of the main shaft of the wheel-side reducer assembly 3 due to seal failure. This improves the problem of excessively high maintenance costs caused by severe wear of the transmission shaft due to oil seal leakage, which necessitates the replacement of both the main shaft and the universal joint output shaft 112. It also reduces the frequency and cost of maintenance. With the addition of this transmission shaft protective sleeve 313, only the transmission shaft protective sleeve 313 needs to be replaced simultaneously when replacing the second half-shaft oil seal 314, greatly improving maintenance convenience and significantly reducing maintenance costs.

[0047] In this embodiment, the second half-shaft oil seal 314 adopts the latest multi-lip joint + PU dustproof ring combination oil seal in the industry (which is an existing technology product and will not be described in detail here). Its anti-mud and water performance is better than that of ordinary oil seals, and the sealing reliability is comprehensively improved. Through the application of this combination structure, the average failure time of the seal at this location has been successfully increased from less than 300 hours to more than 1200 hours, and its reliability has surpassed that of the paddy field dedicated drive axle.

[0048] Example 2

[0049] The harvester in this embodiment includes the dryland waterproof steering drive axle structure for paddy field operations as described in Embodiment 1.

[0050] Example 3

[0051] The tractor in this embodiment includes the dryland waterproof steering drive axle structure for paddy field operations as described in Embodiment 1.

[0052] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A waterproof steering drive axle structure for dryland operations in paddy fields, characterized in that: The system includes a main reducer assembly (1), a steering cylinder assembly (2), and a wheel-side reducer assembly (3). The main reducer assembly (1) has an input shaft (111) passing through its housing, and the input shaft (111) is sealed to the housing by a first sealing structure. The two ends of the housing of the main reducer assembly (1) are rotatably connected to one of the wheel-side reducer assemblies (3). The two ends of the housing of the main reducer assembly (1) are sealed to the corresponding wheel-side reducer assemblies (3) by a second sealing structure. The main reducer assembly (1) has a universal joint output shaft (112) passing through its two ends. The shaft end of the universal joint output shaft (112) is connected to the main shaft of the wheel-side reducer assembly (3). The steering cylinder assembly (2) is mounted on the housing and is connected to the wheel-side reducer assemblies (3) at both ends.

2. The waterproof steering drive axle structure for paddy field operations in dryland areas according to claim 1, characterized in that: The main reducer assembly (1) includes a central axle housing (11), a main reducer housing assembly (12), and a main reducer unit assembly. The central axle housing (11) has an opening on one side of its middle portion. The main reducer housing assembly (12) is assembled at the opening. The main reducer unit assembly is installed in the central axle housing (11). The main reducer unit assembly includes an input shaft (111). The input shaft (111) passes through the main reducer housing assembly (12) at one end away from the central axle housing (11). A first sealing structure is provided between the input shaft (111) and the main reducer housing assembly (12) at one end away from the central axle housing (11). The two ends of the central axle housing (11) are rotatably connected to the wheel-side reducer assembly (3) and sealed by the second sealing structure.

3. The waterproof steering drive axle structure for paddy field operations in dryland areas according to claim 2, characterized in that: The input shaft (111) is fitted with a first oil seal seat ring (1111) at the end of the main reducer housing assembly (12) away from the central bridge housing (11). The first sealing structure includes a main reducer oil seal (41) and a main reducer dust cover (42). The main reducer oil seal (41) is installed outside the first oil seal seat ring (1111) and contacts the inner wall of the end of the main reducer housing assembly (12) away from the central bridge housing (11). The main reducer dust cover (42) is installed on the inner wall of the end of the main reducer housing assembly (12) away from the central bridge housing (11) and close to the first oil seal seat ring (1111).

4. The dryland waterproof steering drive axle structure for paddy field operations according to claim 2, characterized in that: The universal joint output shaft (112) is sealed to the inner wall of the corresponding end of the central bridge housing (11) by a third sealing structure.

5. A waterproof steering drive axle structure for paddy field operations in dryland areas according to claim 4, characterized in that: The third sealing structure includes a bridge housing half-shaft mudguard (51) and a bridge housing half-shaft oil seal (52). The inner walls of both ends of the central bridge housing (11) are respectively equipped with second oil seal seat rings (1112). The inner wall of the second oil seal seat ring (1112) is equipped with a deep groove ball bearing (1113) that fits with the universal joint output shaft (112). The bridge housing half-shaft oil seal (52) and the bridge housing half-shaft mudguard (51) are sequentially spaced on one end of the inner wall of the second oil seal seat ring (1112) near the wheel-side reducer assembly (3), and both are in contact with the surface of the universal joint output shaft (112).

6. A waterproof steering drive axle structure for paddy field operations in dryland areas according to any one of claims 2 to 5, characterized in that: The central axle housing (11) is provided with universal joint receiving cavities (113) at both ends. The shaft head of the universal joint output shaft (112) is connected to one end of the main shaft of the wheel-side reducer assembly (3) in the universal joint receiving cavity (113). The universal joint receiving cavity (113) is rotatably connected to the wheel-side reducer assembly (3), and the two are sealed by the second sealing structure.

7. A waterproof steering drive axle structure for paddy field operations in dryland areas according to claim 6, characterized in that: One end of the housing of the wheel-side reducer assembly (3) is provided with a steering knuckle housing (311) rotatably assembled therewith. The steering knuckle housing (311) is sleeved outside the universal joint receiving cavity (113) at the corresponding end. An annular steering cover (312) is assembled on the steering knuckle housing (311) through its side wall and extending into the interior. The outer surface of the universal joint receiving cavity (113) is provided with an annular groove. The steering cover (312) is embedded in the annular groove and rotatably assembled with the annular groove through a spherical bearing. The steering cover (312) and the inner wall of the groove opening are sealed by the second sealing structure.

8. A waterproof steering drive axle structure for paddy field operations in dryland areas according to claim 7, characterized in that: The second sealing structure includes a steering cover mudguard (61) and a steering cover sealing ring (62). The steering cover sealing ring (62) is assembled between the steering cover (312) and the inner wall of the annular groove, and the steering cover mudguard (61) is assembled at the opening of the annular groove.

9. A waterproof steering drive axle structure for paddy field operations in dryland areas according to claim 7, characterized in that: The steering knuckle housing (311) is fitted with a half-shaft bushing (3111) on its inner wall. The main shaft of the wheel-side reducer assembly (3) is fitted with a drive shaft protective sleeve (313). The drive shaft protective sleeve (313) and the half-shaft bushing (3111) are axially slidably assembled. The inner wall of the end port of the steering knuckle housing (311) near the universal joint receiving cavity (113) is sealed with the drive shaft protective sleeve (313) by a second half-shaft oil seal (314). The second half-shaft oil seal (314) is assembled on the inner wall of the port of the steering knuckle housing (311) and is in sealing contact with the drive shaft protective sleeve (313).

10. A harvester, characterized in that: Includes the dryland waterproof steering drive axle structure for paddy field operations as described in any one of claims 1 to 9.

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