Four-wheel driving device

Abstract

The utility model discloses a four-wheel driving device which comprises an installation base, a box body and driving mechanisms, the box body is arranged on the installation base and fixedly connected with the installation base, the driving mechanisms are arranged on the two sides of the installation base and movably connected with the installation base, and each driving mechanism comprises a hydraulic motor, a speed reducer and a moving assembly. The output end of the hydraulic motor is in bolted connection with the input end of the speed reducer, the outer side of the speed reducer is in bolted connection with the moving assembly, and the inner side of the speed reducer is in bolted connection with the box body. According to the four-wheel drive device, a segmented series connection mode is adopted, series connection driving pipelines are simple in arrangement and only need to be connected through a rubber pipe at the position of a center shaft of the four-wheel drive device, the number of proportional valves needed by series connection driving is small, the running speed of each wheel is adaptive to the running working condition of a target object, control is easy, and reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of four-wheel drive, and particularly relates to a four-wheel drive device. Background Art

[0002] At present, there are various forms of chute retracting and deploying devices. Generally, a winch or an oil cylinder pulley rope system is used as the main pulling force for target recovery or the balance force during deployment. When automatic retracting and deploying is adopted, an auxiliary retracting and deploying hook needs to be installed at the head of the target. If this retracting and deploying hook is not configured, only manual retracting and deploying can be used.

[0003] The four-wheel drive devices in the prior art generally consist of a hydraulic motor and a speed reducer. The form is relatively single. The oil inlet and outlet at the tail end of the motor are connected to the external pipeline of the hydraulic system. Its overall volume is relatively large and it is not applicable in occasions with small space requirements. When the target moves towards the recovery point at a certain speed, it will cause a certain impact, which may damage the device itself and the target, thereby affecting the reliability and safety of the product.

[0004] At the same time, generally, the four-wheel drive devices adopt a parallel form. The pipeline connection of parallel drive needs to be between two wheels of the same four-wheel drive. Pipeline connections are required both axially and vertically between each four-wheel drive device. If the proportional valve is placed in the hydraulic station, a large number of pipelines are needed to be configured from the hydraulic station to the four-wheel drive at the outlet of the proportional valve. If the proportional valves are placed beside each four-wheel drive respectively, a large number of cable connections will be configured. In addition, parallel drive needs to configure various automation sensors to solve the synchronous rotation speed problem of the four-wheel drive, and the economy and reliability are poor. Content of the Utility Model

[0005] The purpose of the utility model aims to solve at least one of the above technical problems to a certain extent.

[0006] To solve the above problems, the utility model provides a four-wheel drive device. This device adopts a segmented series form. The layout of the series drive pipeline is simple, and only hose connection is required at the central axis position of the four-wheel drive device. The number of proportional valves required for series drive is small. The operating speed of each wheel adapts to the operating conditions of the target itself, the control is simple, and the reliability is high.

[0007] At the same time, the four-wheel drive device provided by the utility model has various forms of individual equipment, can be configured according to work requirements, has a compact structure, and can protect the device itself and the target from damage through an overrunning clutch. While overcoming the problem of difficult layout, it can also improve the reliability and safety of the product.

[0008] To achieve the above object, a four-wheel drive device provided by an embodiment of the utility model includes:

[0009] An installation base, a box body and a driving mechanism;

[0010] Among them, the box body is arranged on the installation base and fixedly connected to the installation base; the driving mechanism is arranged on both sides of the installation base and movably connected to the installation base.

[0011] The driving mechanism includes a hydraulic motor, a speed reducer and a moving component.

[0012] Among them, the output end of the hydraulic motor is bolted to the input end of the speed reducer, the outside of the speed reducer is bolted to the moving component, and the inside of the speed reducer is bolted to the box body.

[0013] According to an embodiment of the present invention, the box body includes an upper U-shaped plate, a lower U-shaped plate, side plates, a fixed flange and a cleaning hole flange.

[0014] The upper U-shaped plate and the lower U-shaped plate are arranged in parallel, the side plates connect the upper U-shaped plate and the lower U-shaped plate, and the fixed flange and the cleaning hole flange are respectively welded on the side plates.

[0015] According to an embodiment of the present invention, cylindrical supports are provided on the side plates, and the cylindrical supports are fixedly connected to the installation base.

[0016] According to an embodiment of the present invention, a limiting block is provided on the cylindrical support, and the limiting block cooperates with the installation base.

[0017] According to an embodiment of the present invention, the cleaning hole flange has a cleaning hole flange cover, and the cleaning hole flange cover is bolted to the cleaning hole flange.

[0018] According to an embodiment of the present invention, the moving component includes a tire wheel hub; the tire is sleeved on the wheel hub.

[0019] According to an embodiment of the present invention, the tire wheel hubs include at least four pairs.

[0020] According to an embodiment of the present invention, it further includes: a support mechanism; the support mechanism includes a coupling, and the coupling connects at least four pairs of the tire wheel hubs.

[0021] According to an embodiment of the present invention, the speed reducer has a clutch.

[0022] According to an embodiment of the present invention, it further includes: a pipeline pipe joint; the pipeline pipe joint connects the hydraulic motor and the hydraulic pump station.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention.

[0024] Compared with the prior art, the beneficial effects of the embodiments of the present application are as follows:

[0025] The present utility model provides a four-wheel drive device. By adopting a segmented series connection form, the series drive pipeline layout is simple and concise, and only hose connection is required at the central axis position of the four-wheel drive device. The number of proportional valves required for series drive is small, and the operating speed of each wheel adapts to the operating conditions of the target object itself, with simple control and high reliability.

[0026] The present utility model provides a four-wheel drive device. The form of a single device is diverse and can be configured according to working requirements. It has a compact structure and can protect the device itself and the target object from damage through an overrunning clutch. While overcoming the problem of difficult layout, it can also improve the reliability and safety of the product.

[0027] The present utility model provides a four-wheel drive device. Reliable connection with the mounting base can be achieved through the cylindrical supports provided on the side plates.

[0028] The present utility model provides a four-wheel drive device. Angle limit can be achieved in cooperation with the mounting base through the limit blocks provided on the cylindrical supports.

[0029] The present utility model provides a four-wheel drive device. The cleaning holes provided on the cleaning hole flange can be used to observe the internal operation of the device and for the maintenance of the device.

[0030] The present utility model provides a four-wheel drive device. Reliable transmission of hydraulic oil can be achieved through the pipeline connectors provided for connecting the hydraulic motor and the hydraulic pump station.

[0031] In order to more clearly understand the technical means of the present utility model, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present utility model more obvious and understandable, the following preferred embodiments are specifically given and described in detail in conjunction with the drawings. Other features and advantages of the present utility model will be described in the subsequent specification, and part of them will become obvious from the specification or be embodied by implementing the present utility model. The purposes and other advantages of the present utility model can be achieved and obtained through the structures specifically pointed out in the specification, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the present utility model, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1A is a schematic diagram of the four-wheel drive structure of a four-wheel drive device provided according to an embodiment of the present utility model;

[0034] Figure 1B is another schematic diagram of the four-wheel drive structure of a four-wheel drive device provided according to an embodiment of the present utility model;

[0035] Figure 1C is yet another schematic diagram of the four-wheel drive structure of a four-wheel drive device provided according to an embodiment of the present utility model;

[0036] Figure 2A is a schematic diagram of the two-wheel drive structure of a four-wheel drive device provided according to an embodiment of the present utility model;

[0037] Figure 2B is another schematic diagram of the two-wheel drive structure of a four-wheel drive device provided according to an embodiment of the present utility model;

[0038] Figure 2C is yet another schematic diagram of the two-wheel drive structure of a four-wheel drive device provided according to an embodiment of the present utility model;

[0039] Figure 3A is a schematic diagram of the follow-up structure of a four-wheel drive device provided according to an embodiment of the present utility model;

[0040] Figure 3B is another schematic diagram of the follow-up structure of a four-wheel drive device provided according to an embodiment of the present utility model;

[0041] Figure 3C is yet another schematic diagram of the follow-up structure of a four-wheel drive device provided according to an embodiment of the present utility model;

[0042] Figure 4 is a schematic diagram of the sectional series drive principle of a four-wheel drive device provided according to an embodiment of the present utility model;

[0043] Reference numerals:

[0044] 1 - cleaning hole flange cover; 2 - speed reducer; 3 - clutch; 4 - hydraulic motor; 5 - tire hub; 6 - cylindrical support; 7 - limit block; 8 - side plate; 9 - cleaning hole flange; 10 - upper U-shaped plate; 11 - lower U-shaped plate; 12 - fixed flange; 13 - mounting base; 14 - pipeline connector; 15 - coupling; 16 - box body. Detailed implementation manners

[0045] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model. For this purpose, the present utility model provides a four-wheel drive device.

[0046] Specifically, a four-wheel drive device according to an embodiment of the present utility model will be described below with reference to the accompanying drawings.

[0047] Embodiment 1

[0048] Figure 1A is a schematic diagram of the four-wheel drive structure of a four-wheel drive device provided according to an embodiment of the present utility model, Figure 1B is another schematic diagram of the four-wheel drive structure of a four-wheel drive device provided according to an embodiment of the present utility model, Figure 1C is still another schematic diagram of the four-wheel drive structure of a four-wheel drive device provided according to an embodiment of the present utility model.

[0049] This embodiment mainly describes a four-wheel drive device for four-wheel drive. It is mainly used in working conditions where the required driving force is relatively large and all four wheel systems of the four-wheel drive device have driving forces.

[0050] Specifically, referring to Figures 1A - 1C , this embodiment provides a four-wheel drive device, including:

[0051] a mounting base 13, a housing 16, and a driving mechanism;

[0052] Wherein, the housing 16 is disposed on the mounting base 13 and fixedly connected to the mounting base 13; the driving mechanism is disposed on both sides of the mounting base 13 and movably connected to the mounting base 13;

[0053] The driving mechanism includes a hydraulic motor 4, a speed reducer 2, and a moving component;

[0054] Wherein, the output end of the hydraulic motor 4 is bolted to the input end of the speed reducer 2, the outer side of the speed reducer 2 is bolted to the moving component, and the inner side of the speed reducer 2 is bolted to the housing 16.

[0055] More specifically, the output flange of the hydraulic motor 4 and the input end of the speed reducer 2 are bolted, and reliable fixation and transmission are achieved through the connection between the output shaft of the hydraulic motor 4 and the input end bushing of the speed reducer 2. Among them, the outer flange of the speed reducer 2 is fixedly connected to the tire hub 5 by bolts to achieve synchronous transmission between the tire and the output end of the speed reducer 2, and the inner flange of the speed reducer 2 is reliably fixed to the fixed flange 12 of the housing by bolts.

[0056] A four-wheel drive device provided by an embodiment of the present utility model, by adopting a segmented series form, the series drive pipeline layout is simple, and only hose connection is required at the central axis position of the four-wheel drive device. The number of proportional valves required for series drive is small, and the operating speed of each wheel adapts to the operating conditions of the target object itself, with simple control and high reliability.

[0057] At the same time, the single device of the four-wheel drive device provided by the present utility model has various forms and can be configured according to work requirements. Its structure is compact, and the device itself and the target object can be protected from damage through the overrunning clutch 3. While overcoming the problem of difficult layout, the reliability and safety of the product can be improved.

[0058] In an embodiment of the present utility model, the box body 16 includes an upper U-shaped plate 10, a lower U-shaped plate 11, side plates 8, a fixed flange 12 and a cleaning hole flange 9;

[0059] The upper U-shaped plate 10 and the lower U-shaped plate 11 are arranged in parallel, the side plates 8 connect the upper U-shaped plate 10 and the lower U-shaped plate 11, and the fixed flange 12 and the cleaning hole flange 9 are respectively welded on the side plates 8.

[0060] By adopting the fixed flange 12, reliable fixation with the speed reducer 2 can be achieved through the threaded holes on the fixed flange 12.

[0061] It should be noted that a cylindrical support 6 is provided on the side plate 8, and the cylindrical support 6 is fixedly connected to the mounting base 13.

[0062] It can be understood that the function of setting the cylindrical support 6 is to achieve reliable connection with the mounting base 13.

[0063] Furthermore, a limit block 7 is provided on the cylindrical support 6, and the limit block 7 cooperates with the mounting base 13.

[0064] Among them, the function of setting the limit block 7 is to cooperate with the mounting base 13 to achieve angular limitation.

[0065] In an embodiment of the present utility model, the cleaning hole flange 9 has a cleaning hole flange cover 1, and the cleaning hole flange cover 1 is bolt-fixed to the cleaning hole flange 9.

[0066] It can be understood that the cleaning holes on the cleaning hole flange 9 are mainly used to observe the internal operation of the device and for the maintenance of the device.

[0067] In an embodiment of the present utility model, the moving assembly includes tire hubs 5; the tires are sleeved on the hubs. Among them, it can be understood that the tire hubs 5 include at least four pairs.

[0068] In an embodiment of the present utility model, the speed reducer 2 is provided with a clutch 3.

[0069] In an embodiment of the present utility model, it further includes: a pipeline joint 14; the pipeline joint 14 connects the hydraulic motor 4 and the hydraulic pump station.

[0070] It should be noted that the pipeline joint 14 is mainly used to connect the hydraulic motor 4 and the hydraulic pump station to achieve reliable transmission of hydraulic oil.

[0071] Embodiment 2

[0072] Figure 2A is a schematic diagram of a two-wheel drive structure of a four-wheel drive device provided according to an embodiment of the present utility model, Figure 2B is another schematic diagram of a two-wheel drive structure of a four-wheel drive device provided according to an embodiment of the present utility model, Figure 2C is still another schematic diagram of a two-wheel drive structure of a four-wheel drive device provided according to an embodiment of the present utility model.

[0073] This embodiment mainly describes a two-wheel drive four-wheel drive device, which is mainly used in working conditions where the required driving force is relatively small, and only two gear trains of the four-wheel drive device need to have driving force, and the other two gear trains follow.

[0074] Specifically, referring to Figures 2A - 2C , this embodiment provides a four-wheel drive device, including:

[0075] a mounting base 13, a box body 16 and a driving mechanism;

[0076] Wherein, the box body 16 is arranged on the mounting base 13 and is fixedly connected to the mounting base 13; the driving mechanism is arranged on both sides of the mounting base 13 and is movably connected to the mounting base 13;

[0077] The driving mechanism includes a hydraulic motor 4, a speed reducer 2 and a moving component;

[0078] Wherein, the output end of the hydraulic motor 4 is bolted to the input end of the speed reducer 2, the outside of the speed reducer 2 is bolted to the moving component, and the inside of the speed reducer 2 is bolted to the box body 16.

[0079] More specifically, the output flange of the hydraulic motor 4 and the input end of the speed reducer 2 are bolted, and reliable fixation and transmission are achieved through the connection of the output shaft of the hydraulic motor 4 and the input shaft sleeve of the speed reducer 2. Among them, the outside flange of the speed reducer 2 is fixedly connected to the tire hub 5 through bolts to achieve synchronous transmission between the tire and the output end of the speed reducer 2, and the inside flange of the speed reducer 2 is reliably fixed to the fixed flange 12 of the box body through bolts.

[0080] A four-wheel drive device provided by an embodiment of the present utility model adopts a segmented series connection form, and the series drive pipeline layout is simple. It only needs to be connected by a rubber hose at the central axis position of the four-wheel drive device. The number of proportional valves required for series drive is small, and the operating speed of each wheel adapts to the operating conditions of the target object itself. The control is simple and the reliability is high.

[0081] At the same time, the single device of the four-wheel drive device provided by the present utility model has various forms and can be configured according to work requirements. Its structure is compact, and it can protect the device itself and the target object from being damaged through the overrunning clutch 3. While overcoming the problem of difficult layout, it can improve the reliability and safety of the product.

[0082] In an embodiment of the present utility model, the box body 16 includes an upper U-shaped plate 10, a lower U-shaped plate 11, side plates 8, a fixed flange 12 and a cleaning hole flange 9;

[0083] The upper U-shaped plate 10 and the lower U-shaped plate 11 are arranged in parallel, the side plates 8 connect the upper U-shaped plate 10 and the lower U-shaped plate 11, and the fixed flange 12 and the cleaning hole flange 9 are respectively welded on the side plates 8.

[0084] By adopting the fixed flange 12, reliable fixation with the speed reducer 2 can be achieved through the threaded holes on the fixed flange 12.

[0085] It should be noted that a cylindrical support 6 is provided on the side plate 8, and the cylindrical support 6 is fixedly connected to the mounting base 13.

[0086] It can be understood that the function of setting the cylindrical support 6 is to achieve reliable connection with the mounting base 13.

[0087] Furthermore, a limit block 7 is provided on the cylindrical support 6, and the limit block 7 cooperates with the mounting base 13.

[0088] Among them, the function of setting the limit block 7 is to cooperate with the mounting base 13 to achieve angular limitation.

[0089] In an embodiment of the present utility model, the cleaning hole flange 9 has a cleaning hole flange cover 1, and the cleaning hole flange cover 1 is bolt-fixed to the cleaning hole flange 9.

[0090] It can be understood that the cleaning holes on the cleaning hole flange 9 are mainly used to observe the internal operation of the device and for the maintenance of the device.

[0091] In an embodiment of the present utility model, the moving component includes a tire wheel hub 5; the tire is sleeved on the wheel hub. Among them, it can be understood that the tire wheel hub 5 includes at least four pairs.

[0092] In an embodiment of the present utility model, the speed reducer 2 is provided with a clutch 3.

[0093] In an embodiment of the present utility model, it further includes: a pipeline connector 14; the pipeline connector 14 connects the hydraulic motor 4 and the hydraulic pump station.

[0094] The difference from Embodiment 1 is that the four-wheel drive device described in Embodiment 2 further includes: a support mechanism; the support mechanism includes a coupling 15, and the coupling 15 connects at least four pairs of the tire hubs 5.

[0095] Embodiment 3

[0096] Figure 3A It is a schematic diagram of the follow-up structure of a four-wheel drive device provided according to an embodiment of the present utility model. Figure 3B It is another schematic diagram of the follow-up structure of a four-wheel drive device provided according to an embodiment of the present utility model. Figure 3C It is still another schematic diagram of the follow-up structure of a four-wheel drive device provided according to an embodiment of the present utility model.

[0097] This embodiment mainly describes the four-wheel drive device for follow-up, which is mainly used to buffer the impact of the target object and is generally arranged at the frontmost position.

[0098] Specifically, referring to Figures 3A - 3C , the difference from Embodiment 2 is that in this embodiment, the speed reducer 2, the clutch 3 and the hydraulic motor 4 are omitted, and the functions achieved and the effects realized are the same as those in Embodiment 1 and Embodiment 2, and will not be elaborated here in detail.

[0099] Embodiment 4

[0100] Figure 4 It is a schematic diagram of the sectional series drive principle of a four-wheel drive device provided according to an embodiment of the present utility model.

[0101] Please refer to Figure 4 , this embodiment mainly describes the sectional series drive principle of the four-wheel drive device. As can be seen from Figure 4 , the four-wheel drive device adopts the form of sectional series, which can achieve a simple layout of the series drive pipeline, and only needs to be connected with a rubber hose at the central axis position of the four-wheel drive device. The number of proportional valves required for series drive is small, and the operating speed of each wheel adapts to the operating conditions of the target object itself, with simple control and high reliability.

[0102] It should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0103] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0104] In addition, the terms "horizontal", "vertical", etc. do not mean that the components are required to be absolutely horizontal or hanging vertically, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0105] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0106] The above description is only the preferred embodiment of the present utility model and the description of the applied technical principles. Those skilled in the art should understand that the disclosed scope in the present utility model is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present utility model.

[0107] In addition, although the operations are depicted in a particular order, this should not be construed as requiring that the operations be performed in the particular order shown or in sequential order. In certain environments, multitasking and parallel processing may be advantageous. Similarly, although a number of specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the present utility model. Certain features described in the context of separate embodiments may also be implemented combinatorially in a single embodiment. Conversely, the various features described in the context of a single embodiment may also be implemented separately or in any suitable sub-combination in multiple embodiments.

[0108] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model are included within the scope of the claims of the present utility model pending approval of the application.

Claims

1. A four-wheel drive device, characterized in that: include: Install the base, box and drive mechanism; Wherein, the box body is arranged on the mounting base and is fixedly connected to the mounting base; the driving mechanism is arranged on both sides of the mounting base and is movably connected to the mounting base; The driving mechanism includes a hydraulic motor, a reducer and a moving component; The output end of the hydraulic motor is bolted to the input end of the reducer, the outer side of the reducer is bolted to the moving assembly, and the inner side of the reducer is bolted to the box; Among them, the output end flange of the hydraulic motor is bolted to the input end of the reducer, and reliable fixation and transmission are achieved by connecting the output shaft of the hydraulic motor with the input end sleeve of the reducer; the outer flange of the reducer is fixed to the moving component by bolts to achieve synchronous transmission between the tire and the output end of the reducer, and the inner flange of the reducer is reliably fixed to the fixed flange of the box by bolts.

2. The four-wheel drive device according to claim 1, characterized in that: The box body includes an upper U-shaped plate, a lower U-shaped plate, a side plate, a fixing flange and a cleaning hole flange; The upper U-shaped plate and the lower U-shaped plate are arranged in parallel, the side plate connects the upper U-shaped plate and the lower U-shaped plate, and the fixing flange and the cleaning hole flange are respectively welded to the side plates.

3. The four-wheel drive device according to claim 2, characterized in that: The side plate is provided with a cylindrical support, and the cylindrical support is fixedly connected to the mounting base.

4. The four-wheel drive device according to claim 3, characterized in that: The cylindrical support is provided with a limit block, and the limit block matches the mounting base.

5. The four-wheel drive device according to claim 2, characterized in that: The cleaning hole flange has a cleaning hole flange cover, and the cleaning hole flange cover is fixed to the cleaning hole flange with bolts.

6. The four-wheel drive device according to claim 1, characterized in that: The moving assembly comprises a tire hub; the tire is sleeved on the hub.

7. The four-wheel drive device according to claim 6, characterized in that: The tire hubs include at least four pairs.

8. The four-wheel drive device according to claim 7, characterized in that: Also includes: Support mechanism; the support mechanism includes a coupling, and the coupling connects at least four pairs of tire hubs.

9. The four-wheel drive device according to claim 1, characterized in that: The speed reducer has a clutch.

10. The four-wheel drive device according to claim 1, characterized in that: Also includes: Pipeline fittings; The pipeline joint connects the hydraulic motor and the hydraulic pump station.

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