Tractor based on hub reduction gear

Abstract

The invention discloses a tractor based on a hub reduction gear, comprising: a tractor main body comprising a tractor body, a frame and wheels; the driving system comprises a driving motor and a transmission module, the output end of the driving motor is connected with the transmission module through a transmission part, and the transmission module is connected with wheels; the braking system comprises a dry braking module and a hydraulic braking module, the dry braking module is connected to the transmission module, and the hydraulic braking module is connected to the dry braking module; when the tractor is adjusted from the full-load speed to the first speed state, the driving motor brakes, when the tractor is adjusted from the first speed state to the second speed state, the braking system brakes, and the speed of the first speed state is larger than that of the second speed state. The operation speed of the tractor can reach 15 km / h, dispatching operation in a production line of an internal combustion locomotive and a highway-railway tractor can be replaced, non-pulling wheel lathe operation can be completed in an auxiliary mode, and the tractor has the advantages of being easy to operate, convenient to maintain, high in operation efficiency, intelligent and the like.

Description

Technical Field

[0001] The invention relates to the technical field of rail transportation, in particular to a tractor based on a wheel-side reducer. Background Art

[0002] In order to ensure safe and stable operation of lines and vehicles under high-intensity and frequent use, the market demand for engineering vehicles has greatly increased.

[0003] As more and more vehicles are responsible for maintenance in the same subway line, subway marshaling vehicles need to periodically enter the subway depot for daily inspection, monthly inspection, frame repair, wheel turning and other operations. At present, the dispatching of marshaling vehicles is mainly carried out by diesel shunting vehicles and battery-powered road-rail dual-purpose traction vehicles. Diesel shunting vehicles seriously pollute the environment with fuel, have high operating noise, and lack high-precision positioning. They cannot meet the requirements of wheel-free lathe turning and repair operations. The dispatching speed of road-rail traction vehicles is low, only 3km / h, and the operating efficiency is low. It is difficult to meet the increasingly heavy transfer, maintenance, turning and repair operations of marshaling vehicles. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the present application provides a tractor based on a wheel-side reducer, comprising: A tractor body, comprising a vehicle body, a vehicle frame and wheels, wherein the vehicle body and the wheels are both connected to the vehicle frame; A drive system, comprising a drive motor and a transmission module, wherein the output end of the drive motor is connected to the transmission module via a transmission member, and the transmission module is connected to the wheel; A brake system, comprising a dry brake module and a hydraulic brake module, wherein the dry brake module is connected to the transmission module and is coaxially arranged with the drive motor and the transmission module, and the hydraulic brake module is connected to the dry brake module; When the tractor is adjusted from the full-load speed to the first speed state, the driving motor is used for braking, and when the tractor is adjusted from the first speed state to the second speed state, the braking system is used for braking, wherein the speed of the first speed state is greater than the speed of the second speed state.

[0005] Furthermore, the transmission module includes: An input shaft connected to an output end of the drive motor through the transmission member; A primary planetary gear carrier, comprising a primary planetary gear carrier, a primary sun gear and a plurality of primary planetary gears, wherein the primary planetary gear carrier is connected to the plurality of primary planetary gears via bearings, and the primary sun gear is connected to the input shaft and is meshed with the gear teeth of the plurality of primary planetary gears; A secondary planetary gear carrier, comprising a secondary planetary gear carrier, a secondary sun gear and a plurality of secondary planetary gears, wherein the secondary planetary gear carrier is connected to the plurality of secondary planetary gears via bearings, and the secondary sun gear is connected to the primary planetary gear carrier and meshes with the gear teeth of the plurality of secondary planetary gears; Wherein, the secondary planet carrier is connected to the wheel.

[0006] Furthermore, three groups of the first-stage planetary gears and the second-stage planetary gears are circumferentially arranged on the first-stage planetary carrier and the second-stage planetary carrier respectively, the first-stage sun gear is arranged between the three groups of the first-stage planetary gears, and the second-stage sun gear is arranged between the three groups of the second-stage planetary gears.

[0007] Furthermore, the transmission member is constructed as a spline.

[0008] Furthermore, the dry brake module adopts a dry brake, and the dry brake is arranged between the drive motor and the transmission module.

[0009] Furthermore, the tractor body has six sets of wheels, all of which are provided with the dry brake module, and four of which are provided with the drive system.

[0010] Furthermore, the wheel is a rubber-coated wheel, and the wheel tread is made of polyurethane material.

[0011] Furthermore, the tractor body also includes a suspension shock-absorbing component, which includes a flange plate, a mounting seat and a shock absorber. The mounting seat is connected to the frame, the flange plate is connected to the wheel, and the shock absorber is connected between the flange plate and the mounting seat.

[0012] Furthermore, the full load speed of the tractor is 15 km / h, and the first speed is 5 km / h.

[0013] Furthermore, the tractor also includes: A power supply system, comprising a battery module, a high voltage control module and a low voltage control module electrically connected in sequence, wherein the high voltage control module is electrically connected to the drive motor; A monitoring system, comprising a temperature monitoring module, an open flame monitoring module and a leakage monitoring module, wherein the temperature monitoring module and the open flame monitoring module are used to monitor the battery module, and the leakage monitoring module is used to monitor the high voltage control module; A control system is electrically connected to the driving system, the braking system, the power supply system and the monitoring system.

[0014] Furthermore, the monitoring system also includes a cooling module and a fire extinguishing module, which are respectively used to cool down and extinguish the fire of the battery module.

[0015] The benefits of this application lie in that the traction vehicle based on the wheel-side reducer provided can cover the operations in the frame repair workshop, lathe line and shunting line, meets the market demand, and has the characteristics of "pure electric", "railway operation", "subway marshaling vehicle dispatching within the line and auxiliary completion of wheel-free lathe operations", operating speed of 15km / h, improved driving comfort, and guaranteed operation under complex environment and multiple working conditions, thereby improving the line operation efficiency and enhancing the actual operation safety and reliability; enabling operators to perform operations in a more intelligent and humane way. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of an embodiment of a tractor based on a wheel-side reducer of the present application; Figure 2 for Figure 1 The schematic diagram of the vehicle body structure is removed; Figure 3 It is a schematic diagram of the structure of the suspension shock absorbing components; Figure 4 It is a schematic diagram of the connection structure between the drive system and the dry brake module; Figure 5 for Figure 4 Sectional view; Figure 6 for Figure 4 Exploded image; Figure 7 for Figure 4 Cross-sectional view of the transmission module; Figure 8 This is the exploded view of the transmission module; Fig. 9 for Figure 1 Schematic diagram of the hydraulic brake module structure. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0018] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0019] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0020] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0021] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] See also Figure 1-8 This embodiment provides a tractor based on a wheel-side reducer, including a tractor body 100, a drive system 200, a dry brake module 300, a hydraulic brake module 400, a power supply system 500 and a monitoring system 600.

[0024] See also Figure 1-3The tractor body 100 includes a vehicle body 110, a frame 120 and wheels 130, wherein the frame 120 is used as a connecting component to connect the upper vehicle body and the lower wheels respectively. The vehicle body 100 has a cab to meet the needs of manual driving. The frame 120 is divided into an upper frame 121 and a lower frame 122, which are responsible for carrying and installing various systems to ensure the vehicle connection and transmission between various systems.

[0025] The tractor body 100 also includes a suspension shock-absorbing component 140. The frame 120 is divided into an upper frame 121 and a lower frame 122. The suspension shock-absorbing component includes a flange plate 141, a shock absorber 142 and a mounting seat 143. The mounting seat 143 is connected between the upper frame 121 and the lower frame 122. The flange plate 141 is connected to the wheel edge of the wheel 130. The shock absorber 142 is installed on the flange plate 141.

[0026] There are six groups of wheels 130, which are arranged as shown in the figure. All six groups of wheels are provided with dry brake modules 300, and the front and rear four groups of wheels are provided with drive systems 200, that is, the whole vehicle adopts four-wheel drive and six-wheel braking. The frame 120 is connected to the drive system 200 through the suspension shock absorbing component 140, and weight reduction holes are added on the frame for arranging the oil pipes and electrical lines of the hydraulic brake module.

[0027] The body 110 is designed based on the functional requirements of the whole vehicle, the size layout of the vehicle components, the modular design concept, the ease of operation, the convenience of maintenance, the structural reliability and the aesthetics of the industrial shape. After the relevant functions are confirmed, the design and shape are targeted, and the paint scheme is used to make a targeted industrial shape design. The body shell is welded with high-weathering steel with a thickness of 2-3mm, which has the advantage of rust prevention of the material matrix. At the same time, it is treated with sandblasting, primer and topcoat to achieve the overall rust prevention requirements, and has better rust prevention ability in acid rain, salt spray and long-term exposure to air. The frame and body of the whole vehicle adopt a closed design, and the vents, wire holes, pipe holes, grease filling ports, etc. connected to the outside are sealed to meet the requirements of waterproofing, mildew prevention, dust prevention, and insect prevention.

[0028] Wheel 130 is a rubber-coated wheel, the wheel core is made of forged steel, the tread is made of polyurethane material, the wheel rim profile is designed according to the LM type of TB449, and the rim width is 137mm. The polyurethane material is responsible for ensuring that the wheel and the rail have sufficient friction coefficient, providing traction and braking force for the whole vehicle. Chemlok-213 / Chemlok-219 adhesive is used, and the peel strength of polyurethane can reach 31.5kN / m. The effective bonding width of the rubber-coated form is 139.5mm. The calculated cross-sectional bonding force is 4.4kN. The braking force on the wheel during emergency braking of the whole vehicle is 3.5kN, which meets the design requirements. The hardness of polyurethane is best controlled at Shaw A90~92; with rubber-coated wheels, the wheel-rail adhesion coefficient can reach about 0.5, which can maximize the driving force of the whole vehicle and shorten the braking distance.

[0029] The tractor body also includes a traction coupling component 140, which is modularly designed according to the function. The traction coupling component is divided into a traction seat freedom module, a coupler and automatic uncoupling module, and a coupler distance monitoring module. They are connected through standard parts to ensure the intercommunication of functional requirements and module combinations. The coupler connecting plate is connected to the traction rod seat through a pin shaft, and rubber blocks are set on the left and right and up and down for limit. Its installation position is determined by the swing angle of the coupler. The pin shaft joint bearing uses GE35ES, with a basic rated dynamic load of 79kN and a basic rated static load of 339kN. Since the subway marshaling vehicle uses a 330-type coupler, the coupler of this vehicle uses a 330-type coupler adapter, and the coupler centerline height is 660±10mm. The coupler module has an automatic uncoupling function.

[0030] See also Figure 4-8 The drive system 200 adopts a distributed wheel hub drive system, including a drive motor 210 and a transmission module 220. The output end of the drive motor 210 is connected to the transmission module 220 through a spline 211, and the transmission module is connected to the wheel 130. Specifically, the transmission module 220 includes an input shaft 223, a primary planetary wheel carrier 221 and a secondary planetary wheel carrier 222. One end of the input shaft 223 is connected to the output end of the drive motor 210 through a spline 211. The primary planetary wheel carrier 221 includes a primary planetary carrier 2211, a primary sun gear 224 and three primary planetary wheels 2212. Three primary planetary wheels 2212 are circumferentially arranged on the primary planetary carrier 2211 through bearings. The other end of the input shaft 223 is connected to the primary sun gear 224. The primary sun gear 224 is meshed with the gear teeth of the three primary planetary wheels 2212 at the same time. The secondary planetary wheel carrier 222 includes a secondary planetary carrier 2221, three secondary planetary wheels 2222 and a secondary sun gear 2223. The secondary sun gear 2223 is arranged on the primary planetary carrier 2211. On the other side, three secondary planetary gears 2222 are circumferentially arranged on the secondary planetary carrier 2221 through the bearing, and the other end of the secondary sun gear 2223 is arranged in the three secondary planetary gears 2222 and meshed with the three secondary planetary gears at the same time. The three primary planetary gears and the three secondary planetary gears share an inner ring gear 225 on the outer sides, and the inner ring gear 225 is fixed by a connecting flange 226. The connecting flange 226 is connected to a mounting seat 227. One side of the mounting seat 227 is connected to a brake, and the other side is connected to a flange plate 141. The connecting flange 226 has external teeth that mesh with the internal teeth of the inner ring gear to fix the inner ring gear. The internal teeth of the inner ring gear also mesh with the gear teeth of the three primary planetary gears and the three secondary planetary gears at the same time. The secondary planetary carrier 2221 is finally connected to the hub shell 131 of the wheel.

[0031] When the input shaft 223 drives the first-stage sun gear 224 to rotate, the teeth of the first-stage sun gear will drive the first-stage planetary gear 2212 to rotate. Since the inner ring gear is fixed, the rotation of the first-stage planetary gear 2212 drives the first-stage planetary carrier 2211 to rotate, and then drives the three second-stage planetary gears to rotate through the connected second-stage sun gear. Finally, the rotation of the second-stage planetary carrier 2221 is realized through the action of the inner ring gear, and finally the torque is output to the hub shell 131. Since the number of teeth of the inner ring gear is more than that of the sun gear, the speed of the output shaft will be lower than that of the input shaft, thereby realizing the function of deceleration. At the same time, due to the existence of the planetary carrier, the torque of the output shaft is greater than the torque of the input shaft, thereby realizing the function of transmitting torque.

[0032] The drive system 200 adopts a coaxial arrangement, which shortens the transmission chain and improves the transmission efficiency compared to the transmission type drive. It is also conducive to the lightweight and simplified structural design of the entire vehicle. The drive motor is a water-cooled motor, which is forced to be water-cooled by a radiator to prevent the motor from being damaged by high temperature.

[0033] The dry brake module 300 adopts a full-disc dry brake with integrated driving and parking functions, which is coaxially arranged with the drive motor and the transmission module and connected to the mounting seat 227. The whole vehicle adopts four-wheel independent drive and six-wheel braking. When running at full load, the drive motor is used for conventional braking speed regulation under the working conditions of 15km / h to 5km / h. Mechanical hydraulic driving brakes are used under the working conditions of vehicle speeds below 5km / h. Parking and emergency braking use parking spring brakes. The dry brake and transmission module are designed as an integrated product.

[0034] See also Figure 8 The hydraulic brake module 400 includes an oil tank 401, a DC motor 402, a manual pump 403, an accumulator 404, a hydraulic valve group 405 and a pressure sensor 406. The hydraulic brake module serves as the power source of the entire brake system and is connected to the dry brake through an oil pipe 407. The hydraulic oil drives the pump through the DC motor to deliver the pressure to the accumulator. When the accumulator pressure reaches the set upper limit, the motor is turned off; the pressure sensor can display the pressure value of each hydraulic circuit in real time and feed it back to the control system. The manual pump serves as an emergency power source to provide power for the entire hydraulic system.

[0035] The hydraulic brake module has the functions of pressure establishment, storage and pressure adjustment. It mainly realizes the functions of service braking, parking braking, holding braking and manual braking. It is divided into active and passive control modes, which are used to control the active hydraulic unit and the passive hydraulic unit respectively. The active hydraulic unit controls the pressure through the electrically controlled hydraulic valve group to apply or relieve the brakes; the passive hydraulic unit controls the pressure value for applying or relieving the brakes by strictly controlling the sequence of the proportional valves and the switch valves in the hydraulic valve group to prevent the pressure from being released instantly or suddenly unblocked, resulting in excessive fluctuations in the braking force.

[0036] Specifically, service brake: when the vehicle speed drops to 5km / h when fully loaded, the hydraulic brake is activated, the brake oil pipe generates oil pressure, friction is generated between the friction plates, and the vehicle is braked until the vehicle stops; parking brake: when parking, the oil chamber is depressurized, and the parking piston moves toward the friction pair under the action of the parking spring, pushing the service piston, the single-sided friction plate, and the brake disc in turn. The single-sided friction plate moves toward the front cover, and finally presses the friction pair to the front cover, and a torque is established between the friction plate and the brake disc to prevent the stationary brake disc from rotating; holding brake: when the vehicle stops and starts on the maximum slope of 1.5‰ on the line, the braking system ensures that there is no slipping under the maximum load of the vehicle. When the vehicle speed is zero and the traction control handle is in the non-traction position, the holding brake function is triggered; manual brake: the hydraulic system manual pump serves as an emergency power source to provide power for the entire hydraulic system and manually release the brake.

[0037] The power supply system 500 includes a battery module, a high-voltage control module and a low-voltage control module. The power of the entire vehicle is provided by a battery, which is electrically connected to the high-voltage control module. The high-voltage control module is electrically connected to the controller of the drive motor, and the controller controls the drive motor to realize the movement of the entire vehicle; another path of the high-voltage control module is electrically connected to the low-voltage control module, and the low-voltage control module converts high-voltage electricity into low-voltage electricity to power the low-voltage components of the entire vehicle such as air conditioners, hydraulic pump stations, headlights, touch screens, speakers and other equipment.

[0038] While ensuring the realization of basic functions, the vehicle also needs to consider operational safety and intelligent improvement to ensure vehicle safety, line safety, and personnel safety. Therefore, interlocking monitoring technology, high-voltage insulation detection, and automatic power-off protection technology are adopted.

[0039] The industrial battery of this vehicle requires a DC 540V voltage output, a rated current of 220A, a peak current of 450A, and an industrial battery capacity of 150~160kw.h, so it needs to be equipped with a cooling module and a fire extinguishing module for control.

[0040] The industrial battery of this vehicle requires a DC 540V voltage output, a rated current of 220A, a peak current of 450A, an industrial battery capacity of 150~160kw.h, and a power of 20% or more to ensure the normal operation of the drive motor. The working environment meets the technical requirements, the charging time is ≤8h, and the overall protection level of the battery is IP67. The battery safety performance complies with GB18384-2020 "Safety Requirements for Electric Vehicles", GB38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles", GB38032-2020 "Safety Requirements for Electric Buses", and GB / T 4208-2017 "Enclosure Protection Level" requirements.

[0041] Table 1 Technical parameters of lithium iron phosphate battery The industrial battery voltage of this vehicle is relatively high, so a voltage protection plan needs to be considered to prevent the high voltage from harming the operators. At the same time, emergency power-off situations in the event of short circuits, fires, and other accidents also need to be considered. Due to the characteristics of the material itself, the structural stability of the lithium iron phosphate battery can remain unchanged at high temperatures and overcharges; and it has its own strict BMS battery management system. The safety tests of the battery include experiments such as puncture, extrusion, short circuit, thermal stability, vibration, high and low temperature cycles, etc. It has smoke detection and fire extinguishing device functions, and meets the waterproof immersion and waterproof shower tests, meets the IP68 protection standards, and has EMC, equipotential and other safety designs. It has a manual maintenance switch to ensure that the high voltage is cut off during maintenance, and has a BMS message to ensure safety detection and alarm during battery operation.

[0042] The monitoring system 600 includes a temperature monitoring module, an open flame monitoring module, and a leakage monitoring module. In a high temperature environment, the heat dissipation of the battery cell temperature is hindered, and the battery has a safety risk. Generally, the temperature is reduced by integrated liquid cooling. The battery box has a built-in coolant circulation pipeline, which is provided by the liquid cooling unit and drives the coolant to circulate. The heat is transferred to the liquid cooling unit through the coolant, and then the high-temperature coolant is cooled by the fan of the liquid cooling unit and circulated to the inside of the battery box.

[0043] The open flame monitoring module is monitored by the detector. When an open flame is detected, the fire extinguishing module is activated. The fire extinguishing module consists of a fire extinguisher, a storage tank (perfluorohexanone), a central controller display, and a manual trigger button (mandatory). The detector and fire extinguisher need to be pre-installed inside the standard battery box, and the rest are installed outside and connected through pipes. The fire extinguishing agent in the protection module uses perfluorohexanone, which is liquid at room temperature. When extinguishing a fire, it directly acts on the surface of the battery cell to suppress the open flame and can be quickly converted into gas. At the same time, it absorbs heat from the surrounding environment to achieve a rapid cooling effect.

[0044] The vehicle's high-voltage and high-power electrical components contain leakage protection sensors, which can automatically cut off the circuit when a slight imbalance in current occurs, thus playing a role in leakage protection. The vehicle is equipped with a leakage current Hall sensor on the high-voltage busbar, which can monitor the leakage of the high-voltage circuit at all times. The system will issue a fault alarm and disconnect the high-voltage circuit in time.

[0045] Since the whole vehicle is made of metal, its outer surface is a metal shell, which is equivalent to the Faraday cage of the equipotential body. When lightning strikes on rainy days, the vehicle shell is an equipotential body, the operator in the cab is relatively safe, and the excess current will be transmitted to the rails through the grounding device. When struck by lightning, the electronic equipment in the vehicle may be damaged, causing leakage, fire, and explosion of the equipment, thereby causing indirect harm to personnel. Therefore, this vehicle will add relevant lightning arresters to the high-voltage and high-power components. This ensures the safety of high-voltage equipment.

[0046] The whole vehicle has a high-voltage interlock detection function, which can monitor the connection status of the high-voltage connector at all times. When the vehicle starts, the system will power on only when it detects that the high-voltage connector is well connected. During the operation of the vehicle, if the high-voltage connector is detected to be loose or disconnected, the high-voltage circuit will be disconnected in time to avoid potential safety accidents. The high-voltage and high-power components on the vehicle are equipped with over-voltage, over-current, over-temperature and other protection functions, and the relevant alarm information is always transmitted to the host computer through the CAN bus for real-time monitoring and fault analysis.

[0047] The tractor of the present application also includes a control system for controlling the above-mentioned systems, which can realize the functions of the whole vehicle such as forward, reverse, braking, parameter display, battery management, fault code display, coupling distance monitoring reminder, etc., and can realize long-distance wireless remote control of the remote control.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tractor based on a wheel-side reducer, characterized in that: include: A tractor body, comprising a vehicle body, a vehicle frame and wheels, wherein the vehicle body and the wheels are both connected to the vehicle frame; A drive system, comprising a drive motor and a transmission module, wherein the output end of the drive motor is connected to the transmission module via a transmission member, and the transmission module is connected to the wheel; A braking system, comprising a dry braking module and a hydraulic braking module, wherein the dry braking module is connected to the transmission module and is coaxially arranged with the drive motor and the transmission module, and the hydraulic braking module is connected to the dry braking module; When the tractor is adjusted from the full-load speed to the first speed state, the driving motor is used for braking, and when the tractor is adjusted from the first speed state to the second speed state, the braking system is used for braking, wherein the speed of the first speed state is greater than the speed of the second speed state.

2. The tractor based on the wheel reducer according to claim 1, characterized in that: The transmission module comprises: An input shaft connected to an output end of the drive motor through the transmission member; A primary planetary gear carrier, comprising a primary planetary gear carrier, a primary sun gear and a plurality of primary planetary gears, wherein the primary planetary gear carrier is connected to the plurality of primary planetary gears via bearings, and the primary sun gear is connected to the input shaft and is meshed with the gear teeth of the plurality of primary planetary gears; A secondary planetary gear carrier, comprising a secondary planetary gear carrier, a secondary sun gear and a plurality of secondary planetary gears, wherein the secondary planetary gear carrier is connected to the plurality of secondary planetary gears via bearings, and the secondary sun gear is connected to the primary planetary gear carrier and meshes with the gear teeth of the plurality of secondary planetary gears; An inner gear ring is fixed by a connecting flange, and its inner teeth are meshed with the gear teeth of the plurality of primary planetary gears and the plurality of secondary planetary gears at the same time; Wherein, the secondary planet carrier is connected to the wheel.

3. The tractor based on wheel reducer according to claim 2 is characterized in that: Three groups of the first-stage planetary gears and the second-stage planetary gears are circumferentially arranged on the first-stage planet carrier and the second-stage planet carrier respectively, the first-stage sun gear is arranged between the three groups of the first-stage planetary gears, and the second-stage sun gear is arranged between the three groups of the second-stage planetary gears.

4. The tractor based on the wheel reducer according to claim 2 is characterized in that: The transmission element is configured as a spline.

5. The tractor based on wheel reducer according to claim 1, characterized in that: The dry brake module adopts a dry brake, and the dry brake is arranged between the drive motor and the transmission module.

6. The tractor based on wheel reducer according to claim 1, characterized in that: The tractor body has six sets of wheels, all of which are provided with the dry brake modules, and four of which are provided with the drive system.

7. The tractor based on the wheel reducer according to claim 6, characterized in that: The wheel is a rubber-coated wheel, and the wheel tread is made of polyurethane material.

8. The tractor based on wheel reducer according to claim 1, characterized in that: The tractor body also includes a suspension shock-absorbing component, which includes a flange plate, a mounting seat and a shock absorber. The mounting seat is connected to the vehicle frame, the flange plate is connected to the wheel, and the shock absorber is connected between the flange plate and the mounting seat.

9. The tractor based on wheel reducer according to claim 1, characterized in that: The full-load speed of the tractor is 15 km / h, and the first speed is 5 km / h.

10. The tractor based on wheel reducer according to claim 1, characterized in that: The tractor also includes: A power supply system, comprising a battery module, a high voltage control module and a low voltage control module electrically connected in sequence, wherein the high voltage control module is electrically connected to the drive motor; A monitoring system, comprising a temperature monitoring module, an open flame monitoring module and a leakage monitoring module, wherein the temperature monitoring module and the open flame monitoring module are used to monitor the battery module, and the leakage monitoring module is used to monitor the high voltage control module; A control system is electrically connected to the driving system, the braking system, the power supply system and the monitoring system.

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