Mechanical hydraulic alternately actuated double planetary gear differential for vehicles

Abstract

The application relates to a mechanical hydraulic alternating actuating double-planetary gear transfer case for vehicles, which comprises a box body, an input shaft, a double-planetary gear assembly and a hydraulic motor; one end of the input shaft extends into the box body, one end of the input shaft extends out of the box body, and the end of the input shaft extending out of the box body is connected with a power output end of a vehicle chassis transmission; the end of the input shaft extending into the box body is connected with a rear axle output shaft through a shaft gear shifting mechanism; the hydraulic motor is connected with an input end of the double-planetary gear assembly through a one-way clutch, output ends of the double-planetary gear assembly are respectively connected with a second-axle driven gear and a front axle output shaft, the second-axle driven gear is connected with a first-axle actuating gear, and the first-axle actuating gear is connected with the first-axle gear shifting mechanism; a front axle disconnect mechanism is further arranged between the output ends of the double-planetary gear assembly and the front axle output shaft. The application realizes random switching of multiple working states, can adapt to the low-speed working environment of special vehicles, and meets the working requirements of airport runway glue removing vehicles, road snow removing vehicles and ice breaking vehicles.

Description

TECHNICAL FIELD

[0001] The present application relates to a gear transfer case, in particular to a mechanical and hydraulic alternating actuation double planetary gear transfer case for vehicles. BACKGROUND

[0002] The traditional transfer case product is mainly used for automobile four-wheel drive, and the automobile four-wheel drive is realized through the transfer case to improve the whole vehicle climbing performance, off-road performance and other driving performance. The transfer case is more used in highway maintenance special vehicles.

[0003] The patent with application number 201921326186.4 describes a low-speed driving transfer case, which mainly comprises: a main input shaft is rotatably arranged on one side of the middle part of the box body through a first bearing, one end of the main input shaft extending out of the box body is connected with the transmission shaft of the automobile transmission, the other side is rotatably arranged with a main output shaft through a second bearing, one end of the main output shaft extending out of the box body is connected with the automobile rear axle transmission shaft, the other end of the main input shaft extending into the box body is movably connected with the other end of the main output shaft extending into the box body through a third bearing, a main input gear is arranged on the main input shaft in the box body, a main output gear is rotatably arranged on the main output shaft in the box body through a fourth bearing, a first internal gear is arranged on one end of the main output gear, and a second internal gear is arranged on the main input shaft. The patent is a two-stage reduction gear box, the vehicle speed is reduced through the transmission and then the transfer case, although the total transmission speed ratio increases, the vehicle realizes low speed to a certain extent, but the low speed stability of the vehicle is insufficient. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, the present application proposes a mechanical and hydraulic alternating actuation double planetary gear transfer case for vehicles.

[0005] The technical scheme adopted by the present application to solve its technical problems is: a mechanical and hydraulic alternating actuation double planetary gear transfer case for vehicles, comprising a box body, an input shaft, a front axle output shaft, a double planetary gear assembly and a hydraulic motor;

[0006] One end of the input shaft extends into the box body, one end of the input shaft extends out of the box body, and one end of the input shaft extending out of the box body is connected with the power output end of the vehicle chassis transmission; one end of the input shaft extending into the box body is connected with the rear axle output shaft through an axle gear shifting mechanism;

[0007] The hydraulic motor is connected with the input end of the double planetary gear assembly through a one-way clutch, the output end of the double planetary gear assembly is respectively connected with a two-axis driven gear and the front axle output shaft, the two-axis driven gear is connected with an axle actuating gear, and the axle actuating gear is connected with the axle gear shifting mechanism;

[0008] The output end of the double planetary gear assembly and the front axle output shaft are further provided with a front axle disengaging mechanism.

[0009] In one embodiment of the present application, the double planetary gear assembly comprises a wheel disc, a sun gear arranged in the wheel disc, and three sets of double planetary gear sets, each set of double planetary gear set comprising a planet carrier, a bottom planetary gear and a top planetary gear which are concentric, a support shaft is arranged at the center of the bottom planetary gear and the center of the top planetary gear, and the diameter of the top planetary gear is smaller than that of the bottom planetary gear.

[0010] The wheel disc comprises an upper wheel disc body and a lower wheel disc body, the inner wall of the upper wheel disc body is provided with a gear ring, and the inner wall of the lower wheel disc body is a smooth surface; the sun gear is arranged at the center of the lower wheel disc body, the bottom planetary gear is arranged between the inner wall of the lower wheel disc body and the sun gear, and the bottom planetary gear is engaged with the sun gear; and the top planetary gear is engaged with the gear ring of the inner wall of the upper wheel disc body.

[0011] In one embodiment of the present application, a needle bearing is arranged between the support shaft and the bottom planetary gear and the top planetary gear, and a blocking ring is further arranged on the top end of the top planetary gear along the outer ring of the support shaft.

[0012] In one embodiment of the present application, an oil tank is connected to the side of the box through an oil outlet pipe, an oil pump is arranged on one side of the oil tank, the other side of the oil tank is connected to a filtering mechanism, the filtering mechanism is connected to a cooling mechanism, and the cooling mechanism is connected to the box through an oil inlet pipe.

[0013] In one embodiment of the present application, the oil tank, the filtering mechanism and the cooling mechanism are arranged on a base frame, a base is arranged at the bottom end of the base frame, the base is arranged on the outer wall of the box, and the surface of the base which is in contact with the box is an arc surface matched with the box.

[0014] The cooling mechanism is an exchange heat exchanger comprising a water inlet and a water outlet.

[0015] In one embodiment of the present application, the filtering mechanism comprises a filter cylinder, a filter plate is vertically arranged in the filter cylinder, the bottom end of the filter plate is in contact with the inner wall of the bottom end of the filter cylinder, and the filter plate divides the filter cylinder into an oil inlet barrel and an oil outlet barrel.

[0016] The oil inlet barrel is provided with an oil inlet at the top end, and the oil outlet barrel is provided with an oil outlet at the bottom end.

[0017] The oil inlet barrel is provided with an oil inlet baffle and a first filter screen, the oil inlet baffle is arranged at the top end of the first filter screen, one end of the oil inlet baffle is a first connecting end, and the other end is a first free end, the first connecting end is connected to the inner wall of the oil inlet barrel, and a space is left between the first free end and the inner wall of the oil inlet barrel to form a first oil guide opening.

[0018] In one embodiment of the present application, the oil inlet baffle is arranged obliquely, and the first connecting end is kept higher than the first free end.

[0019] The first filter screen is obliquely arranged, and one end of the first filter screen close to the first connecting end is lower than the other end of the first filter screen.

[0020] In one embodiment of the present application, the bottom end of the first filter screen is connected to the bracket on the inner wall of the oil inlet barrel through a spring.

[0021] In one embodiment of the present application, the oil inlet barrel further comprises an oil guide plate and a second filter screen at the lower part of the first filter screen, and the second filter screen is located at the lower part of the oil guide plate.

[0022] One end of the oil guide plate is a second connecting end, and the other end is a second free end, the second connecting end is arranged on the inner wall of the oil inlet barrel, and the second free end is spaced from the wall of the oil inlet barrel to form a second oil guide opening.

[0023] The second connecting end of the oil guide plate is higher than the second free end.

[0024] One end of the second filter screen close to the second connecting end is lower than the other end of the second filter screen.

[0025] In one embodiment of the present application, the oil inlet barrel and the oil outlet cylinder further comprise a hollow cavity, and a cooling medium is introduced into the hollow cavity.

[0026] The present application has the advantages that: the present application realizes the hydraulic pressure alternating actuation mode, meets the chassis high mobility in the special vehicle operation process, the transmission speed ratio of the double planetary gear assembly can be adjusted according to the needs, the double planetary gear assembly is combined ingeniously, the structure is novel, the sun gear of the previous stage and the planet carrier of the next stage are combined into one through the double planetary gear, there is no radial support, and the structure is in a suspended state, thereby reducing the support; the double planetary gear assembly has strong carrying capacity per unit mass, stable and reliable transmission, low noise, high transmission efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural principle schematic diagram of the present application;

[0028] Figure 2 is a structural schematic diagram of the double planetary gear assembly;

[0029] Figure 3 is a structural schematic diagram of the wheel disc;

[0030] Figure 4 is a structural schematic diagram of the double planetary gear set;

[0031] Figure 5 is a structural schematic diagram of the box body;

[0032] Figure 6 is a structural schematic diagram of the filter mechanism;

[0033] In the figure: tank 1; oil tank 101; filtering mechanism 102; filter cartridge 102a; filter plate 102b; oil inlet bucket 102c; oil inlet 102c1; oil outlet bucket 102d; oil outlet 102d1; oil inlet baffle 1021; first connecting end 1021a; first free end 1021b; first filter screen 1022; first oil guide 1023; oil guide plate 1024; second connecting end 1024a; second free end 1024b; second filter screen 1025; second oil guide 1026; cavity 1027; spring 1028; cooling mechanism 103; water inlet 1031; water outlet 1032; chassis 104; base 105; input shaft 2; front axle output shaft 3; double planetary gear assembly 4; wheel disc 401; upper wheel disc body 4011; lower wheel disc body 4012; gear ring 4013; sun gear 402; double planetary gear set 403; bottom planetary gear 4031; top planetary gear 4032; support shaft 4033; needle roller bearing 4034; blocking ring 4035; planet carrier 4036; hydraulic motor 5; one-shaft gear shift mechanism 6; rear axle output shaft 7; one-way clutch 8; two-shaft driven gear 9; one-shaft actuating gear 10; front axle disengaging mechanism 11. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended only for the purpose of explaining the present application, and should not be understood as limiting the present application.

[0035] In the description of the present application, 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", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0036] As Figures 1 to 4The illustrated mechanical hydraulic alternating actuation double planetary gear power divider for vehicle comprises a box body 1, an input shaft 2, a front axle output shaft 3, a double planetary gear assembly 4 and a hydraulic motor 5;

[0037] The input shaft 2 extends into the box body 1 at one end and extends out of the box body at the other end, and the end of the input shaft 2 extending out of the box body is connected to the power output end of the vehicle chassis transmission; the end of the input shaft 2 extending into the box body is connected to the rear axle output shaft 7 through an axle gear shifting mechanism 6;

[0038] The hydraulic motor 5 is connected to the input end of the double planetary gear assembly 4 through a one-way clutch 8, the output end of the double planetary gear assembly 4 is connected to the two-axis driven gears 9 and the front axle output shaft 3 respectively, the two-axis driven gears 9 are connected to the one-axis actuating gear 10, and the one-axis actuating gear 11 is connected to the one-axis gear shifting mechanism 6;

[0039] The output end of the double planetary gear assembly 4 is further provided with a front axle disengaging mechanism 11.

[0040] As an embodiment, the double planetary gear assembly 4 in the application comprises a wheel disc 401, a sun gear 402 arranged in the wheel disc and three groups of double planetary gear sets 403, each group of double planetary gear set comprising a planet carrier 4036, a bottom planetary gear 4031 and a top planetary gear 4032 sharing the same center, a support shaft 4033 being arranged through the center of the bottom planetary gear 4031 and the center of the top planetary gear 4032, and the diameter of the top planetary gear 4032 being smaller than that of the bottom planetary gear 4031;

[0041] The wheel disc 401 comprises an upper wheel disc body 4011 and a lower wheel disc body 4012, the inner wall of the upper wheel disc body 4011 is provided with a gear ring 4013, and the inner wall of the lower wheel disc body 4012 is a smooth surface; the sun gear 402 is arranged at the center position of the lower wheel disc body 4012, the bottom planetary gear 4031 is arranged between the inner wall of the lower wheel disc body 4012 and the sun gear 402, and the bottom planetary gear 4031 is engaged with the sun gear 402; the top planetary gear 4032 is engaged with the gear ring of the inner wall of the upper wheel disc body 4011. That is, in the application, the input end of the double planetary gear assembly is the sun gear, and the output end is each corresponding planet carrier. The transmission speed ratio of the double planetary gear assembly of the application can be adjusted as needed, the double planetary gear assembly is combined ingeniously, the structure is novel, the sun gear of the previous stage and the planet carrier of the next stage are integrated through the double planetary gear, there is no radial support, the state is suspended, the support is reduced; the double planetary gear assembly of the application has strong carrying capacity per unit mass, stable and reliable transmission, low noise and high transmission efficiency.

[0042] In the application, the support shaft 4033 is provided with a needle bearing 4034 between the bottom planetary gear 4031 and the top planetary gear 4032, and a retaining ring 4035 is further provided on the top end of the top planetary gear along the outer ring of the support shaft, so as to ensure the stability of each group of double planetary gear sets and ensure the stable operation of the gear box.

[0043] The application has three working state switching devices, namely an axle gear position switching mechanism 6, a front axle disconnect mechanism 11 and a one-way clutch 8 input by the hydraulic motor 5. The switching of the three mechanisms is carried out according to the designed logical relationship to switch the working state.

[0044] I. The power transmission route of the low-speed operation walking actuation is: the hydraulic motor 5 drives the input end of the double planetary gear assembly 4 through the one-way clutch 8, and the output end of the double planetary gear assembly 4 is respectively connected to the front axle output shaft and the rear axle output shaft through the transmission shaft.

[0045] II. The power transmission route in the high-speed turning field working condition is: the axle gear position switching mechanism 6 is disconnected, the front axle disconnect mechanism 11 is disconnected, the power is input through the input shaft 2 and transmitted to the rear axle output shaft 7.

[0046] III. The power transmission route in the low-speed operation working condition is: the vehicle transmission is in the neutral gear, the axle gear position switching mechanism 6 is engaged, the power is transmitted through the hydraulic motor 5, the sun gear 402, the double planetary gear set, the planetary carrier output of each group of double planetary gear sets, specifically, the planetary carrier output of one group of double planetary gear sets is connected to the front axle output shaft, and the planetary carrier output of the other group of double planetary gear sets is connected to the second axle driven gear 9 and the first axle actuating gear 11 to drive the rear axle output shaft.

[0047] The application realizes the hydraulic alternating actuation mode, meets the chassis high mobility in the operation process of the special vehicle. The mechanical gear is the vehicle driving gear, and the hydraulic gear is the operation gear. The hydraulic gear can realize the speed regulation without discharge. When the hydraulic operation gear is used, the vehicle is switched to the hydraulic transmission mode, at this time, the transmission has no power output (neutral gear), the hydraulic motor inputs power, and the power is transmitted through the double planetary gear assembly to actuate the vehicle. When the mechanical driving gear is used, the vehicle enters the original vehicle transmission system, and the power is transmitted to the rear axle through the transfer case to realize the vehicle driving. The gear transfer case of the application realizes the random switching of multiple working states, which can adapt to the low-speed operation environment of the special vehicle to meet the operation requirements of the airport runway rubber removal vehicle, the road snow removal vehicle and the ice breaking vehicle.

[0048] The lubricating oil in the gear transfer case increases the stability and reliability of the operation of the transfer case, and avoids the dry friction phenomenon in the transfer case. However, after the lubricating oil is used for a period of time, the lubricating oil carries dirt, impurities and the like. In order to avoid the damage of the impurities in the lubricating oil to the transfer case, it is necessary to filter the dirt and impurities in the lubricating oil. Specifically, in order to ensure the stability and prolong the service life of the gear transfer case, the lubricating oil in the application is filtered through a filter element 401.Figure 5 and Figure 6 As shown in the figure, the tank is connected with the oil tank 101 through the oil outlet pipe on one side, the oil tank 101 is provided with an oil pump on one side, and the oil tank 101 is connected with the filtering mechanism 102 on the other side, the filtering mechanism 102 is connected with the cooling mechanism 103, and the cooling mechanism 103 is connected with the tank 1 through the oil inlet pipe. The lubricating oil in the transfer case is pumped into the oil tank by the oil pump, and the oil flow in the oil pipe is filtered by the filtering mechanism to remove impurities in the lubricating oil, which is beneficial to ensure the lubricating effect of the lubricating oil on the transfer case. The cooling mechanism realizes the cooling of the lubricating oil, thereby ensuring the stability of the operation of the transfer case.

[0049] The oil tank 101, the filtering mechanism 102 and the cooling mechanism 103 are all arranged on the chassis 104, the chassis 104 is provided with a base 105 at the bottom end, the base 105 is arranged on the outer wall of the tank 1, and the side of the base 105 in contact with the tank 1 is an arc surface matched with the tank. In this application, the oil tank, the filtering mechanism and the cooling mechanism are arranged in sequence from top to bottom on the side wall of the transfer case tank, which facilitates the flow of lubricating oil. The oil tank, the filtering mechanism and the cooling mechanism are all arranged on the base through the chassis, and the base is connected with the outer wall of the tank, thereby realizing the close connection between the above components and the tank and ensuring the integrity of the action between the above components and the tank. Specifically, the cooling mechanism 103 is a heat exchanger, which includes a water inlet 1031 and a water outlet 1032 to cool the lubricating oil.

[0050] The filtering mechanism 102 includes a filter cartridge 102a, a filter plate 102b is vertically arranged in the filter cartridge 102a, the bottom end of the filter plate 102b is in contact with the inner wall of the bottom end of the filter cartridge, and the filter plate 102b divides the filter cartridge into an oil inlet bucket 102c and an oil outlet cylinder 102d.

[0051] The oil inlet bucket 102c is provided with an oil inlet 102c1 at the top end, and the lubricating oil enters the oil inlet bucket through the oil inlet; the bottom end of the oil outlet cylinder is provided with an oil outlet 102d1, and the lubricating oil is discharged from the filtering mechanism through the oil outlet.

[0052] The oil inlet bucket 102c is provided with an oil inlet baffle 1021 and a first filter screen 1022, the oil inlet baffle 1021 is located at the top end of the first filter screen 1022, one end of the oil inlet baffle 1021 is a first connecting end 1021a, and the other end is a first free end 1021b, the first connecting end 1021a is connected with the inner wall of the oil inlet bucket, and the first free end 1021b is spaced from the inner wall of the oil inlet bucket to form a first oil guide hole 1023. In this application, the oil inlet baffle realizes the guidance of the lubricating oil entering the filter cartridge, so that the lubricating oil enters the inside of the oil inlet bucket from the first oil guide hole, is filtered by the first filter screen, and is then filtered by the filter plate before being discharged from the oil outlet.

[0053] In the application, as a preferred embodiment, the oil inlet baffle 1021 is arranged obliquely, and the first connecting end 1021a is kept higher than the first free end 1021b; that is, the oblique arrangement of the oil inlet baffle realizes the guiding effect on the lubricating oil, while ensuring the passing speed of the lubricating oil; the first filter screen 1022 is arranged obliquely, and the end of the first filter screen 1022 close to the first connecting end is lower than the other end of the first filter screen; that is, the higher end of the first filter screen corresponds to the first oil guide port, and the first filter screen realizes the filtration of the lubricating oil through the higher end of the first filter screen; after long-term use, when the higher end of the first filter screen is blocked, the lubricating oil will flow to the lower end of the first filter screen under the action of gravity; the arrangement of the first filter screen ensures that each position of the first filter screen can realize effective filtration of the lubricating oil, thereby prolonging the service life of the first filter screen.

[0054] The bottom end of the first filter screen 1022 is connected to the bracket on the inner wall of the oil inlet bucket through the spring 1028; when the first filter screen 1022 filters the lubricating oil, due to the pressure of the lubricating oil on the first filter screen, the first filter screen is forced to move downward, and the first filter screen will continuously vibrate under the action of the spring, which is conducive to increasing the filtration speed of the lubricating oil; at the same time, the impurities at the higher position of the first filter screen will be left at the lower end after vibration, without affecting the filtration of the lubricating oil at the higher position of the first filter screen.

[0055] The oil inlet bucket further comprises an oil guide plate 1024 and a second filter screen 1025 at the lower part of the first filter screen 1022; the second filter screen 1025 is located at the lower part of the oil guide plate 1024; the lubricating oil filtered by the first filter screen is guided by the oil guide plate and then filtered by the second filter screen, thereby increasing the filtration effect on the lubricating oil;

[0056] In the application, one end of the oil guide plate 1024 is the second connecting end 1024a, and the other end is the second free end 1024b; the second connecting end 1024a is arranged on the inner wall of the oil inlet bucket 102c, and the second free end 1024b is spaced from the interval wall of the oil inlet bucket 102c to form the second oil guide port 1026;

[0057] The second connecting end 1024a of the oil guide plate 1024 is arranged higher than the second free end 1024b; and the end of the second filter screen 1025 close to the second connecting end is lower than the other end of the second filter screen. That is, the lubricating oil is guided for the second time by the oil guide plate, so that the lubricating oil filtered for the first time is filtered at the higher position of the second filter screen; similarly, when the higher end of the second filter screen is blocked after long-term use, the lubricating oil will flow to the lower end of the second filter screen, thereby ensuring that each position of the second filter screen can realize the filtration of the lubricating oil, extending the service life of the second filter screen; and the lubricating oil filtered by the second filter screen is filtered for the third time by the filter plate and then discharged.

[0058] When the second filter screen is blocked, the lubricating oil filtered by the first filter screen is filtered by the filter plate between the first filter screen and the second filter screen and then discharged through the oil outlet; when the first filter screen is blocked, the lubricating oil is filtered by the filter plate and then discharged through the oil outlet, thereby prolonging the service life of the filtering mechanism.

[0059] In the application, the first filter screen, the second filter screen and the filter plate are used to filter the lubricating oil three times, thereby improving the filtering effect of the lubricating oil, avoiding impurities in the lubricating oil, ensuring stable operation of the transfer case and prolonging the service life of the transfer case.

[0060] The oil inlet barrel 102c and the oil outlet cylinder 102d are further provided with a cavity 1027 with a hollow cavity, and a cooling medium is introduced into the hollow cavity, so that the lubricating oil is cooled for the first time by the cooling medium in the cavity, and the lubricating oil cooled and filtered for the first time is cooled by the cooling mechanism and then enters the transfer case again for circulation, so that the lubricating oil is cooled while being filtered, the temperature of the lubricating oil entering the transfer case is effectively reduced, the stable and effective operation of the transfer case is ensured, and the service life of the transfer case is ensured.

[0061] In the description of the present specification, the description of the terms "one embodiment", "certain embodiments", "illustrative embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0062] In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, therefore the protection scope of the present application is subject to the scope defined by the claims.

Claims

1. A mechanically hydraulically alternately actuated double planetary gear range transfer case for a vehicle, characterized in that, The box, input shaft, front axle output shaft, double planetary gear assembly and hydraulic motor are included. One end of the input shaft extends into the box and the other end extends out of the box, and the end extending out of the box is connected to the power output end of the vehicle chassis transmission. The hydraulic motor is connected to the input end of the double planetary gear assembly through a one-way clutch, the output end of the double planetary gear assembly is connected to the two-axis driven gear and the front axle output shaft respectively, the two-axis driven gear is connected to the one-axis actuating gear, and the one-axis actuating gear is connected to the one-axis gear shifting mechanism. The front axle disconnect mechanism is further arranged between the output end of the double planetary gear assembly and the front axle output shaft. One side of the box is connected to the oil tank through an oil outlet pipe, one side of the oil tank is provided with an oil pump, the other side of the oil tank is connected to the filtering mechanism, the filtering mechanism is connected to the cooling mechanism, and the cooling mechanism is connected to the box through an oil inlet pipe. The oil tank, filtering mechanism and cooling mechanism are arranged on the undercarriage, the bottom end of the undercarriage is provided with a base, the base is arranged on the outer wall of the box, and the surface of the base in contact with the box is an arc surface matched with the box. The cooling mechanism is a heat exchanger, which includes a water inlet and a water outlet. The filtering mechanism includes a filter cartridge, a filter plate is vertically arranged in the filter cartridge, the bottom end of the filter plate is in contact with the inner wall of the bottom end of the filter cartridge, and the filter plate divides the filter cartridge into an oil inlet barrel and an oil outlet barrel. The oil inlet barrel is provided with an oil inlet at the top end, and the oil outlet barrel is provided with an oil outlet at the bottom end. The oil inlet barrel is provided with an oil baffle and a first filter screen, the oil baffle is located at the top end of the first filter screen, one end of the oil baffle is a first connecting end, and the other end is a first free end, the first connecting end is connected to the inner wall of the oil inlet barrel, and a space is left between the first free end and the inner wall of the oil inlet barrel to form a first oil guide opening. The oil baffle is arranged obliquely, and the first connecting end is higher than the first free end. The first filter screen is arranged obliquely, and one end of the first filter screen close to the first connecting end is lower than the other end of the first filter screen. The oil inlet barrel at the lower part of the first filter screen is further provided with a guide plate and a second filter screen, and the second filter screen is located at the lower part of the guide plate. One end of the guide plate is a second connecting end, and the other end is a second free end, the second connecting end is arranged on the inner wall of the oil inlet barrel, and a space is left between the second free end and the oil inlet barrel to form a second oil guide opening. The second connecting end of the guide plate is higher than the second free end. One end of the second filter screen close to the second connecting end is lower than the other end of the second filter screen.

2. The mechanically hydraulically alternating actuated double planetary gear range transfer case of claim 1, wherein, The double planetary gear assembly includes a wheel disc, a sun gear arranged in the wheel disc and three groups of double planetary gear sets, each group of double planetary gear set includes a planet carrier, a bottom planetary gear and a top planetary gear with the same center, a support shaft is arranged at the center of the bottom planetary gear and the center of the top planetary gear, and the diameter of the top planetary gear is smaller than that of the bottom planetary gear. The wheel disc comprises an upper wheel disc body and a lower wheel disc body, an inner wall of the upper wheel disc body is provided with a gear ring, and an inner wall of the lower wheel disc body is a smooth surface; the sun gear is arranged at a central position of the lower wheel disc body, the bottom planetary gear is arranged between the inner wall of the lower wheel disc body and the sun gear, and the bottom planetary gear is in mesh with the sun gear; and the top planetary gear is in mesh with the gear ring of the inner wall of the upper wheel disc body.

3. The mechanical hydraulic alternately actuated double planetary gear range transfer case of claim 2, wherein, Rolling needle bearings are arranged between the support shaft and the bottom planetary gear and the top planetary gear, and a blocking ring is further arranged on the top end of the top planetary gear along the outer ring of the support shaft.

4. The mechanically hydraulically alternating actuated double planetary gear range transfer case of claim 1, wherein, The first filter screen is connected to a support on the inner wall of the oil inlet barrel through a spring.

5. The mechanically hydraulically alternating actuated double planetary gear range transfer case of claim 1, wherein, The outer ring of the oil inlet barrel and the oil outlet cylinder is further provided with a cavity, and a cooling medium is introduced into the cavity.

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