Single-wheel-side driving system, rear axle double-wheel-side driving system and large-tonnage mine car

Abstract

The utility model provides a single-wheel-side driving system, a rear axle double-wheel-side driving system and a large-tonnage mine car, and belongs to the technical field of electric wheel driving systems.The single-wheel-side driving system comprises a motor, a confluence speed reducer, a wheel-side speed reducer and tires, and the output end of the confluence speed reducer is connected with the input end of the wheel-side speed reducer; the tire is arranged at the output end of the hub speed reducer, the output ends of the multiple motors are independently connected with the input end of the converging speed reducer, and power output by the multiple motors is converged through the converging speed reducer and then transmitted to the hub speed reducer so that the hub speed reducer can drive the tire to rotate. The whole weight, the size and the cost of the motor are greatly reduced, meanwhile, accessories of the motor are low in cost and easy to obtain, the cost of the whole vehicle and the operation cost are reduced, when one motor breaks down in the using process, other motors can be used for operating equipment to a maintenance site after the motor is disassembled, and the influence of road blockage on operation of other equipment in a mining area is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric wheel drive systems, and particularly relates to a single-wheel-edge drive system, a rear-axle double-wheel-edge drive system and a large-tonnage mine car. BACKGROUND

[0002] With the rapid development of battery technology, pure electric electric wheel mine cars are increasingly widely used in open-pit mine transportation operations due to the advantages of low operating cost and zero carbon emission, becoming the development trend of electric wheel mine cars. Figure 1 As shown in the figure, the current vehicle adopts a front-axle steering and rear-axle double-wheel-edge drive form. The rear-axle wheel edge adopts a single high-power three-phase asynchronous motor 1 connected with a speed reducer 2 through bolts, the speed reducer 2 is connected with a rear-axle tube 3 through bolts, and the speed reducer 2 is connected with a tire 4 through two groups of bolts and nuts to drive the vehicle to run.

[0003] Since the equipment consumption of mine cars is much less than that of highway commercial vehicles, the cost of high-power three-phase asynchronous motors is high. At the same time, the single high-power motor with large mass has high power and large current, and requires a high controller, thereby resulting in high cost of the converter cabinet and high cost and operating cost of the vehicle for customers. Moreover, when the drive motor fails, the mine car cannot move by itself, which easily blocks the road in the narrow working condition of the mine area, and affects the operation of other vehicles in the mine area for a long time, thereby affecting the production of the mine. CONTENT OF THE INVENTION

[0004] The application embodiment provides a single-wheel-edge drive system, a rear-axle double-wheel-edge drive system and a large-tonnage mine car. The power output by multiple motors is converged through the converging speed reducer and then transmitted to the wheel-edge speed reducer, so that the wheel-edge speed reducer drives the tire to rotate. The multiple motors are connected in parallel to drive, the overall weight, volume and cost of the motor are greatly reduced, the accessory cost of the motor is low and easy to obtain, the vehicle cost and operating cost are reduced, and when one motor fails in use, the motor can be disassembled and other motors can be used to run the equipment to a repair site, thereby avoiding the influence of road blocking on the operation of other equipment in the mine area.

[0005] The problems that the pure electric electric wheel mine car adopts a single high-power three-phase asynchronous motor, the cost of the high-power three-phase asynchronous motor is high, the controller is required to be high, the cost of the converter cabinet is high, the cost and operating cost of the vehicle for customers are high, and when the drive motor fails, the mine car cannot move by itself, which easily blocks the road in the narrow working condition of the mine area, and affects the operation of other vehicles in the mine area for a long time, thereby affecting the production of the mine are solved.

[0006] In a first aspect, the application embodiment provides a single-wheel-edge drive system, which comprises:

[0007] a wheel-edge speed reducer;

[0008] a tire arranged at an output end of the wheel-side reduction machine;

[0009] a confluence reduction machine arranged on the wheel-side reduction machine, an output end of the confluence reduction machine being connected with an input end of the wheel-side reduction machine;

[0010] a motor arranged on the confluence reduction machine, output ends of a plurality of the motors being respectively and independently connected with input ends of the confluence reduction machine, so that powers output by the plurality of the motors are all transmitted to the wheel-side reduction machine through the confluence reduction machine after being converged by the confluence reduction machine.

[0011] In a feasible implementation, the motor is a high-speed permanent magnet motor.

[0012] Three high-speed permanent magnet motors are arranged on the confluence reduction machine, and the three high-speed permanent magnet motors are arranged in a triangular shape.

[0013] In a feasible implementation, the single-wheel-side driving system further comprises a wet brake.

[0014] The wet brake comprises a fixed shell and an inner ring, the fixed shell is fixedly connected with a rack of the wheel-side reduction machine, and the inner ring is rotatable relative to the fixed shell and is fixedly connected with a hub of the wheel-side reduction machine.

[0015] The wet brake is configured to apply a braking action on the hub through braking cooperation between the fixed shell and the inner ring.

[0016] In a feasible implementation, the single-wheel-side driving system further comprises a floating seal.

[0017] The inner ring and the hub constitute a rotating body, and the floating seal is arranged between the rotating body and the rack of the wheel-side reduction machine.

[0018] The floating seal comprises a fixed end and a rotating end, the rotating end is rotatable relative to the fixed end and sealingly cooperates with the fixed end, the fixed end is sealingly connected with the rack, and the rotating end is sealingly connected with the rotating body.

[0019] In a feasible implementation, a plurality of screw rods are arranged on the hub in a ring shape along a circumferential direction of the hub, and the screw rods are configured to be used for assembling the rims of the tires.

[0020] Two tires are assembled on the hub, and the two tires are arranged in a spaced parallel manner along a central axis direction of the hub.

[0021] In a feasible implementation, the single-wheel-side driving system further comprises a cooling system, and the cooling system comprises an electronic oil pump and a plate heat exchanger arranged on a shell of the confluence reduction machine.

[0022] The combined reduction gear is provided with a cooling medium cavity, and the cooling medium cavity, the electronic oil pump and the plate heat exchanger are in communication with each other;

[0023] The cooling system is used to drive the cooling medium to flow in circulation between the cooling medium cavity and the plate heat exchanger by the electronic oil pump.

[0024] In a feasible implementation, the motor is provided with a first positioning stop, which is used to axially position the motor and the combined reduction gear;

[0025] The motor and the combined reduction gear are fixedly connected through first bolts, and the first bolts are uniformly distributed around the output shaft of the motor.

[0026] In a feasible implementation, the combined reduction gear is provided with a second positioning stop, which is used to axially position the combined reduction gear and the rack of the wheel reduction gear;

[0027] The combined reduction gear and the wheel reduction gear are fixed through second bolts, and the second bolts are uniformly distributed around the output shaft of the combined reduction gear.

[0028] In the second aspect, the embodiments of the present application further provide a rear axle double-wheel reduction drive system, comprising an axle tube and the single-wheel reduction drive system.

[0029] The two single-wheel reduction drive systems are oppositely arranged, and the axle tube is connected with the racks of the two single-wheel reduction drive systems at two axial ends thereof.

[0030] In the third aspect, the embodiments of the present application further provide a large-tonnage mine car, comprising the rear axle double-wheel reduction drive system.

[0031] The single-wheel reduction drive system, the rear axle double-wheel reduction drive system and the large-tonnage mine car provided by the embodiments of the present application, the single-wheel reduction drive system comprises a motor, a combined reduction gear, a wheel reduction gear and a tire, the output end of the combined reduction gear is connected with the input end of the wheel reduction gear, the tire is arranged at the output end of the wheel reduction gear, the output ends of the plurality of motors are independently connected with the input end of the combined reduction gear, respectively, the power output by the plurality of motors is transmitted to the wheel reduction gear through the combined reduction gear after being converged, so that the wheel reduction gear drives the tire to rotate, the plurality of motors are driven in parallel, the overall weight, volume and cost of the motor are greatly reduced, meanwhile, the accessory cost of the motor is low and the motor is easy to obtain, thereby reducing the overall cost and operation cost of the vehicle, and when one of the motors fails in use, the vehicle can be disassembled and driven to a maintenance site by using the other motors, thereby avoiding the influence of the failure on the operation of other equipment in the mine area. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structural schematic diagram of an existing rear axle dual wheel-side driving system;

[0033] Figure 2 is a structural schematic diagram of a single wheel-side driving system provided by the present application;

[0034] Figure 3 is a schematic diagram of a wheel-side reduction machine and its connecting structure;

[0035] Figure 4 is an exploded view of Figure 3

[0036] Figure 5 is a schematic diagram of a combined reduction machine and its connecting structure;

[0037] Figure 6 is a structural schematic diagram of a rear axle dual wheel-side driving system provided by the present application.

[0038] BRIEF DESCRIPTION OF DRAWINGS

[0039] 10 - motor; 20 - combined reduction machine; 30 - wheel-side reduction machine; 40 - tire; 50 - wet brake; 60 - floating seal; 70 - cooling system; 80 - axle tube;

[0040] 21 - housing; 22 - output spline shaft; 31 - frame; 32 - inner spline sleeve; 33 - wheel hub; 51 - fixed housing; 52 - inner ring; 71 - electronic oil pump; 72 - plate heat exchanger;

[0041] 1 - three-phase asynchronous motor; 2 - reduction machine; 3 - rear axle tube; 4 - tire. DETAILED DESCRIPTION

[0042] In order to make the person in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely 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 the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person in the art without creative labor should belong to the protection scope of the present application.

[0043] ​At present, the pure electric electric wheel mine car adopts a single high-power three-phase asynchronous motor. The high-power three-phase asynchronous motor has high cost. Meanwhile, the motor has high power and large current, and the controller has high requirements, resulting in high cost of the converter cabinet, and high cost and operation cost of the whole vehicle for the customer. Moreover, when the driving motor fails, the mine car cannot move by itself, and is easy to block the road in the narrow working condition of the mine area, which affects the operation of other vehicles in the mine area for a long time and affects the production of the mine.

[0044] The single wheel edge driving system provided in the application is characterized in that the power output by the plurality of motors is converged through the confluence reducer and then transmitted to the wheel edge reducer, so that the wheel edge reducer drives the tire to rotate. The plurality of motors are driven in parallel, the overall weight, volume and cost of the motors are greatly reduced, the accessory cost of the motor is low and easy to obtain, the whole vehicle cost and operation cost are reduced, and when one motor fails during use, the device can be operated to a maintenance site by using other motors after being disassembled, thereby avoiding the influence of the blocked road on the operation of other equipment in the mine area. The problems of the pure electric electric wheel mine car adopting a single high-power three-phase asynchronous motor, high cost of the high-power three-phase asynchronous motor, high requirements for the controller, high cost of the converter cabinet, high cost and operation cost of the whole vehicle for the customer, and the mine car being unable to move by itself when the driving motor fails, which is easy to block the road in the narrow working condition of the mine area and affects the operation of other vehicles in the mine area for a long time and affects the production of the mine are solved.

[0045] The specific structure of the single wheel edge driving system, the rear axle double wheel edge driving system and the large-tonnage mine car provided in the application will be described in detail below with reference to the accompanying drawings.

[0046] Referring to Figures 2-5 The single wheel edge driving system provided in the application includes a motor 10, a confluence reducer 20, a wheel edge reducer 30 and a tire 40.

[0047] The tire 40 is arranged at the output end of the wheel edge reducer 30. The confluence reducer 20 is arranged on the wheel edge reducer 30, and the output end of the confluence reducer 20 is connected with the input end of the wheel edge reducer 30. The motor 10 is arranged on the confluence reducer 20, and the output ends of the plurality of motors 10 are respectively and independently connected with the input end of the confluence reducer 20, so that the power output by the plurality of motors 10 is converged through the confluence reducer 20 and then transmitted to the wheel edge reducer 30.

[0048] The confluence reducer 20 can be a QSC series three-in-one reducer, and the model can be QSC10. As Figures 2-4As shown, the combined speed reducer 20 includes a housing 21, the left end of the housing 21 is the input end, the right end is the output end, and the output end is the output spline shaft 22. The left end of the housing 21 of the combined speed reducer 20 is detachably provided with a plurality of motors 10. The motor 10 can be a high-speed permanent magnet motor commonly used for commercial vehicles. The output ends of the plurality of motors 10 are respectively and independently connected with the input end of the combined speed reducer 20.

[0049] The wheel side speed reducer 30 includes a rack 31 and an input end and an output end located at both ends of the rack 31. The input end is an inner spline sleeve 32, and the output end is a wheel hub 33. The tire 40 is arranged at the output end of the wheel side speed reducer 30, i.e. the tire 40 is assembled on the wheel hub 33 of the wheel side speed reducer 30.

[0050] The right end of the housing 21 of the combined speed reducer 20 is detachably connected with the rack 31 of the wheel side speed reducer 30, and the output spline shaft 22 of the combined speed reducer 20 is detachably connected with the inner spline sleeve 32 of the wheel side speed reducer 30, so as to transmit torque and rotational speed.

[0051] The combined speed reducer 20 receives the power output by the plurality of motors 10, integrates the independently input power, and transmits the integrated power to the input end of the wheel side speed reducer 30, thereby providing a basis for the integrated power for the subsequent wheel side speed reducer 30 to drive the tire 40 to rotate.

[0052] The single-wheel side drive system provided by the present application has the following advantages:

[0053] 1. The plurality of high-speed permanent magnet motors commonly used for commercial vehicles are connected in parallel for driving, the overall weight, volume and cost of the motor 10 are greatly reduced, the reliability is improved, the high-speed permanent magnet motor has high efficiency and is more energy-saving.

[0054] 2. The plurality of high-speed permanent magnet motors commonly used for commercial vehicles are connected in parallel for driving, the power and current of the motor 10 are small, the weight and volume of a single motor are small, and the motor is easy to maintain and replace.

[0055] 3. The plurality of high-speed permanent magnet motors commonly used for commercial vehicles are connected in parallel for driving, the parts are easy to obtain, the cost of the parts is low, and the response is fast.

[0056] 4. In the plurality of high-speed permanent magnet motors commonly used for commercial vehicles, when one motor 10 fails, the device can be operated to a maintenance site by using other motors 10 after being disassembled, thereby avoiding the influence of road blockage on the operation of other devices in the mine area.

[0057] Referring to Figure 5 As shown, in some embodiments, the motor 10 is a high-speed permanent magnet motor;

[0058] Three high-speed permanent magnet motors are arranged on the combined speed reducer 20, and the three high-speed permanent magnet motors are arranged in a triangular shape.

[0059] Three high-speed permanent magnet motors are arranged in a triangle at the input end of the converging speed reducer 20, facilitating the disassembly and assembly of the motor 10.

[0060] Referring to Figures 2-4 illustrated, in some embodiments, the single wheel hub drive system further comprises a wet brake 50;

[0061] The wet brake 50 comprises a fixed housing 51 and an inner ring 52, the fixed housing 51 is fixedly connected with the frame 31 of the wheel hub speed reducer 30, and the inner ring 52 is rotatable relative to the fixed housing 51 and is fixedly connected with the wheel hub 33 of the wheel hub speed reducer 30;

[0062] The wet brake 50 is used to apply a braking action to the wheel hub 33 through the braking cooperation between the fixed housing 51 and the inner ring 52.

[0063] The single wheel hub drive system is braked by the wet brake 50, and the wet brake 50 is sleeved with the wheel hub speed reducer 30. The fixed housing 51 of the wet brake 50 is detachably fixedly connected with the frame 31 of the wheel hub speed reducer 30, the inner ring 52 of the wet brake 50 is rotatable relative to the fixed housing 51 and is detachably fixedly connected with the wheel hub 33 of the wheel hub speed reducer 30, and the inner ring 52 rotates synchronously with the wheel hub 33 and the tire 40.

[0064] The wet brake 50 is used to apply a braking action to the wheel hub 33 through the braking cooperation between the fixed housing 51 and the inner ring 52.

[0065] The mechanical brake of the present application adopts wet braking, has large braking torque, and the performance is greatly improved, and the braking distance is smaller. The mechanical brake of the present application does not have dry friction, and the wet braking can make the vehicle slow down and stop. When the electric brake is recharged and the battery is full, the wet brake can be used for slow-down braking. The safety risks of easy failure of the braking resistor and dry braking friction fire are completely avoided.

[0066] Further, referring to Figures 2-4 illustrated, in some embodiments, the single wheel hub drive system further comprises a floating seal 60;

[0067] The inner ring 52 and the wheel hub 33 constitute a rotating body, and the floating seal 60 is arranged between the rotating body and the frame 31 of the wheel hub speed reducer 30;

[0068] The floating seal 60 comprises a fixed end and a rotating end, the rotating end is rotatable relative to the fixed end and maintains a sealing cooperation therebetween, the fixed end is sealingly connected with the frame 31, and the rotating end is sealingly connected with the rotating body.

[0069] As Figure 3 and Figure 4As shown, the floating seal 60 is installed at the gap between the rotating body and the frame 31 of the wheel-side reduction machine 30. The floating seal 60 is composed of a pair of structurally symmetrical "floating rings", one of which is a rotating end that is detachably fixed to the joint end of the hub 33 and the inner ring 52 and rotates synchronously with them, and the other is a fixed end that is detachably fixed to the frame 31 of the wheel-side reduction machine 30 and remains stationary.

[0070] The sealing ends of the two floating rings are in close contact with each other and can slightly "float" in the axial direction to compensate for the deviation in coaxiality or deformation of the components during rotation.

[0071] In the initial state, the sealing surfaces of the two floating rings are in close contact, forming an initial sealing surface that blocks external dust, sand and internal cooling oil / brake fluid leakage; when the hub 33 and the inner ring 52 rotate, the sealing surfaces of the two floating rings slide relative to each other, and a very thin oil film will be formed between the contact surfaces, which not only reduces friction and wear, but also further enhances the sealing effect; if the internal medium pressure rises, the pressure will act on the end surface of the floating ring, pushing it to fit more tightly, and the higher the pressure, the stronger the sealing effect, while the "floating" feature can adapt to the radial runout or axial movement of the rotating components, always maintaining effective contact of the sealing surface and ensuring the reliability of the seal.

[0072] Referring to Figure 3 and Figure 4 As shown, in some embodiments, the hub 33 is provided with a plurality of threaded rods arranged in a ring shape along the circumferential direction of the hub 33, and the threaded rods are used for the wheel rim of the tire 40 to pass through and assemble;

[0073] The hub 33 is assembled with two tires 40, and the two tires 40 are arranged in parallel along the central axis direction of the hub 33.

[0074] As shown in Figure 4 , a plurality of threaded rods are protruded on the end surface of the hub 33 facing the tire 40, the threaded rods are arranged in a ring shape along the circumferential direction of the hub 33, and the extension direction is parallel to the central axis of the hub 33, and when the tire 40 is installed, the wheel rim is correspondingly passed through the threaded rods, and then the fastening nuts are screwed with the threaded rods to realize the locking and fixing of the wheel rim of the tire 40 and the hub 33.

[0075] As shown in Figure 2 , the hub 33 of the wheel-side reduction machine 30 is assembled with two tires 40, and the two tires 40 are arranged in parallel along the central axis direction of the hub 33. The interval design avoids the mutual friction of the two tires 40, and the parallel layout ensures the stable assembly of the two tires 40 on the wheel-side reduction machine.

[0076] Referring to Figure 5 , in some embodiments, the single-wheel-side drive system further comprises a cooling system 70, and the cooling system 70 comprises an electronic oil pump 71 and a plate heat exchanger 72 arranged on the shell of the combined-flow reduction machine 20.

[0077] The combined reduction machine 20 is provided with a cooling medium cavity, and the cooling medium cavity, the electronic oil pump 71 and the plate heat exchanger 72 are communicated with each other; the cooling system 70 is used for driving the cooling medium to circulate and flow between the cooling medium cavity and the plate heat exchanger 72 through the electronic oil pump 71.

[0078] The cooling system 70 is used for cooling the combined reduction machine 20, and the cooling system 70 comprises an electronic oil pump 71 and a plate heat exchanger 72 arranged on the shell of the combined reduction machine 20; the cooling medium cavity of the combined reduction machine 20, the electronic oil pump 71 and the plate heat exchanger 72 are sequentially connected and communicated through pipelines, so that the cooling medium circulates and flows in the three.

[0079] When the combined reduction machine 20 generates heat during operation, the cooling medium in the cooling medium cavity absorbs the heat generated in the operation of the reduction machine, the temperature of the cooling medium itself rises, and the cooling medium becomes high-temperature cooling medium; at the same time, the cooling system 70 is started, and the electronic oil pump 71 starts to work, and extracts the high-temperature cooling medium from the cooling medium cavity of the combined reduction machine 20 through its own power, and pushes it to the circulating pipeline under stable pressure.

[0080] The high-temperature cooling medium is transported to the plate heat exchanger 72, and when the high-temperature cooling medium flows in the channel of the plate heat exchanger 72, the heat is quickly transferred to the external low-temperature medium through the heat exchange fins, and the temperature of the high-temperature cooling medium is greatly reduced.

[0081] The low-temperature cooling medium after completing the cooling flows back to the cooling medium cavity of the combined reduction machine 20 along the return liquid pipeline, forming a complete cycle of "heat absorption-extraction-heat exchange-return flow". The electronic oil pump 71 continuously drives the medium circulation, so that the heat exchange process is repeatedly carried out, thereby continuously taking away the heat of the combined reduction machine 20, controlling the working temperature of the combined reduction machine 20 in a safe range, and guaranteeing the transmission efficiency and the service life of the components.

[0082] In some embodiments, the motor 10 is provided with a first positioning stop, and the first positioning stop is used for axially positioning the motor 10 and the combined reduction machine 20.

[0083] The motor 10 and the combined reduction machine 20 are fixedly connected through first bolts, and the first bolts are uniformly distributed around the output shaft of the motor 10.

[0084] The first positioning stop can be a circular stop, which is a coaxial cylindrical surface matching structure for precise positioning, and is in the shape of a circular ring as a whole, comprising a convex stop and a concave stop. The convex stop is arranged on the end face of the output end of the motor 10, and can be a protruding cylindrical shoulder, and the cylindrical surface of the shoulder is smooth; the concave stop is arranged on the end face of the input end of the combined reduction machine 20, and can be a circular groove, and the inner diameter of the groove is in "small gap fit" with the outer diameter of the convex stop, and the depth of the groove matches the height of the convex stop.

[0085] The cylindrical surface of the convex stop and the concave stop is matched, the central axes of the two components are forced to coincide, and the motor 10 is axially positioned with the combined reducer 20.

[0086] In some embodiments, a second positioning stop is arranged on the combined reducer 20, and the second positioning stop is used to axially position the combined reducer 20 and the frame 31 of the wheel-side reducer 30.

[0087] The combined reducer 20 and the wheel-side reducer 30 are fixed by a plurality of second bolts, and the plurality of second bolts are uniformly distributed around the output shaft of the combined reducer 20.

[0088] The structure and function of the second positioning stop are consistent with those of the first positioning stop, and precise positioning is achieved through the small gap matching of the convex and concave cylindrical surfaces. Through the design of the second positioning stop, the coaxiality of the combined reducer 20 and the frame 31 of the wheel-side reducer 30 during assembly can be effectively ensured, a stable reference is provided for subsequent bolt fixing, and the precise docking of the overall transmission structure is ensured.

[0089] Referring to Figure 6 The application further provides a rear axle double-wheel-side driving system, which comprises an axle tube 80 and the single-wheel-side driving system.

[0090] The two single-wheel-side driving systems are oppositely arranged, and the two ends of the axle tube 80 in the axial direction are connected with the frames 31 of the wheel-side reducers 30 of the two single-wheel-side driving systems, respectively.

[0091] The rear axle double-wheel-side driving system connects the two oppositely arranged single-wheel-side driving systems through the axle tube 80. The axle tube 80 can have a cylindrical structure, the two ends of the axle tube 80 in the axial direction are connected with the frames 31 of the wheel-side reducers 30 of the two single-wheel-side driving systems, respectively, and the motors 10 of the two single-wheel-side driving systems are located in the axle tube 80.

[0092] The rear axle double-wheel-side driving system provided by the application not only realizes synchronous power transmission of the double-wheel-side, but also ensures the relative position stability of the two wheel-side reducers 30 through the axle tube 80, thereby avoiding the influence of wheel-side deviation on driving accuracy during driving.

[0093] The existing large-tonnage mine car has many problems. A single high-power three-phase asynchronous motor is used, which not only has high cost and large quality, but also increases the cost of the whole vehicle and the converter cabinet; the braking relies on the dry friction form of the service brake, the parking brake and the brake disc, and when the electric brake fails, sparks are easy to produce, which may cause fire risk; and a single motor failure will cause the equipment to be unable to move, which may cause road blockage and affect production in the mine area, and the wheel-side system lacks heat dissipation optimization, and the overall weight is large.

[0094] The application further provides a large-tonnage mine car, which comprises the rear axle double-wheel-side driving system.

[0095] The large-tonnage mine car provided by the application is driven by a plurality of commercial high-speed permanent magnet motors 10 through a combined reducer 20, replacing the existing single high-power motor. The commercial high-speed permanent magnet motor has a lower cost, and the dispersed current load reduces the requirements on the controller, without the need for a high-cost converter cabinet. At the same time, the quality of a single small motor is smaller, and the integrated combined reducer 20 can also reduce the weight of the whole vehicle, effectively reducing the purchase and operation costs. Secondly, a wet brake 50 is configured, the fixed shell 51 of which is connected with the rack 31 of the wheel edge reducer 30, and the inner ring 52 is connected with the wheel hub 33 of the wheel edge reducer 30, so as to replace dry friction with liquid braking, avoid high-temperature sparks, and eliminate the risk of fire from the source. The floating sealing element 60 can prevent the erosion of mine dust, prolong the service life of the braking system, and the like.

[0096] It is easy to understand that, on the basis of the several embodiments provided by the application, the skilled in the art can combine, split, recombine, and the like, to obtain other embodiments, and these embodiments do not exceed the protection scope of the application.

[0097] The above specific embodiments further specifically describe the purposes, technical solutions, and beneficial effects of the embodiments of the application. It should be understood that the above is only a specific embodiment of the application, and is not used to limit the protection scope of the embodiments of the application. Any modification, equivalent replacement, improvement, and the like made on the basis of the technical solutions of the embodiments of the application should be included in the protection scope of the embodiments of the application.

Claims

1. A single wheel edge drive system characterized by: Comprise; Wheel edge reduction machine; Tire arranged on the output end of the wheel edge reduction machine; Confluence reduction machine arranged on the wheel edge reduction machine, the output end of the confluence reduction machine is connected with the input end of the wheel edge reduction machine; Motor arranged on the confluence reduction machine, the output ends of a plurality of the motors are respectively independently connected with the input end of the confluence reduction machine, so that the power output by a plurality of the motors is converged through the confluence reduction machine and then transmitted to the wheel edge reduction machine.

2. The single wheel edge driving system according to claim 1, wherein: The motor is a high-speed permanent magnet motor; Three high-speed permanent magnet motors are arranged on the confluence reduction machine, and the three high-speed permanent magnet motors are arranged in a triangular shape.

3. The single wheel edge driving system according to claim 1, wherein: The single wheel edge driving system further comprises a wet brake; The wet brake comprises a fixed shell and an inner ring, the fixed shell is fixedly connected with the frame of the wheel edge reduction machine, the inner ring is rotatable relative to the fixed shell and is fixedly connected with the hub of the wheel edge reduction machine; The wet brake is used to apply a braking action to the hub through the braking cooperation between the fixed shell and the inner ring.

4. The single wheel edge driving system according to claim 3, wherein: The single wheel edge driving system further comprises a floating seal; The inner ring and the hub constitute a rotating body, and the floating seal is arranged between the rotating body and the frame of the wheel edge reduction machine; The floating seal comprises a fixed end and a rotating end, the rotating end is rotatable relative to the fixed end and maintains sealing cooperation therebetween, the fixed end is sealingly connected with the frame, and the rotating end is sealingly connected with the rotating body.

5. The single wheel edge driving system according to claim 4, wherein: Screw rods are arranged on the hub, a plurality of the screw rods are arranged in a ring shape along the circumferential direction of the hub, and the screw rods are used for the wheel rim of the tire to pass through and be assembled; Two tires are assembled on the hub, and the two tires are arranged in parallel and spaced apart along the central axis of the hub.

6. The single wheel edge driving system according to claim 1, wherein: The single wheel edge driving system further comprises a cooling system, the cooling system comprises an electronic oil pump and a plate heat exchanger arranged on the shell of the confluence reduction machine; The confluence reduction machine is provided with a cooling medium cavity, and the cooling medium cavity, the electronic oil pump and the plate heat exchanger are in communication with each other; The cooling system is used to drive the cooling medium to circulate between the cooling medium cavity and the plate heat exchanger through the electronic oil pump.

7. The single wheel edge driving system according to claim 1, wherein: A first positioning stop is arranged on the motor, and the first positioning stop is used to axially position the motor and the confluence reduction machine; The motor and the confluence reduction machine are fixedly connected through first bolts, and a plurality of the first bolts are uniformly distributed around the output shaft of the motor.

8. The single wheel edge driving system according to claim 1, wherein: The confluence speed reducer is provided with a second positioning stopper, which is used for axially positioning the confluence speed reducer and the rack of the wheel-side speed reducer; The confluence speed reducer and the wheel-side speed reducer are fixed by second bolts, which are uniformly distributed around the output shaft of the confluence speed reducer.

9. A rear axle dual wheel edge drive system characterized by: The single-wheel-side driving system comprises a bridge cylinder and the single-wheel-side driving system of any one of claims 1-8. The two single-wheel-side driving systems are oppositely arranged, and the two ends of the bridge cylinder in the axial direction are connected with the racks of the wheel-side speed reducers of the two single-wheel-side driving systems, respectively.

10. A large tonnage mine car characterized by: The rear axle double-wheel-side driving system comprises the rear axle double-wheel-side driving system of claim 9.

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