Disclosed are a disc type axial flux motor vehicle axle gear box body and a design and manufacturing method thereof

Abstract

The application discloses a disc type axial flux motor vehicle axle gear box body and a manufacturing method thereof. The disc type axial flux motor vehicle axle gear box body comprises a pull rod arm, a lower bottom box body, a middle box body and an upper cover box body which are sequentially detachably connected and are in box body shapes of an upper opening, an upper and lower opening and a lower opening respectively, a shaft mounting hole and a first transmission ratio gear shaft hole are arranged between the lower bottom box body and the middle box body, a second transmission ratio gear shaft hole and a disc type axial flux motor mounting hole are arranged between the middle box body and the upper cover box body, the included angle between the center line of the shaft mounting hole and the first transmission ratio gear shaft hole and the center line of the second transmission ratio gear shaft hole and the disc type axial flux motor mounting hole is an acute angle, the center line of the first transmission ratio gear shaft hole and the second transmission ratio gear shaft hole is perpendicular to the center line of the second transmission ratio gear shaft hole and the disc type axial flux motor mounting hole, and the pull rod arm is arranged on the middle box body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of locomotive bogie axle structure gear box, in particular to a disc type axial flux electric locomotive axle gear box body and a design and manufacturing method thereof, which is suitable for GK type locomotive. BACKGROUND

[0002] Modern locomotives (such as GK type locomotives) generally adopt the structure of a bogie running gear. The bogie on the locomotive is equivalent to the two legs of a person, so it is also called the running gear of the locomotive. Since the bogie structure running gear is suitable for high speed, high power, various driving modes and axle type, as well as various requirements of elastic suspension and foundation brake mode. Therefore, the modern locomotive running gear basically adopts the structure of the bogie.

[0003] The bogie mainly consists of a frame, a spring device, a connecting device, a wheel set and a axle box, a driving device, a foundation brake device and the like. The bogie can bear the entire weight on the car body, including the car body, the frame, the power device and various auxiliary devices and electric locomotive and electric facilities, etc., can ensure the necessary adhesion between the wheel and the rail, and generate a circular traction force at the wheel and rail contact to achieve traction of the train. The frame is the skeleton of the bogie, which bears and transmits vertical and horizontal forces; the spring device ensures uniform distribution of axle load and ensures smooth operation of the locomotive; the wheel set and the axle box directly transmit the weight of the locomotive to the steel rail; the driving device transmits the traction power of the locomotive power device to the wheel set.

[0004] At present, the GK type locomotive drive is mainly through the universal shaft and the axle gear box to transmit the traction power to the wheel set to achieve the traction of the train. The GK type locomotive body usually has two bogies, and each bogie usually has two axle gear boxes. The problems are: with the dual pressure of depletion of oil resources and serious environmental pollution, vigorously developing new energy has become the consensus of the international community, among which the consumption of transportation energy is one of the main sources of environmental pollution and global greenhouse effect. Therefore, the transportation energy power system has changed the locomotive using internal combustion engine. When the transformation, in order to reduce the impact of the transformation on the locomotive, the bogie structure is usually kept unchanged, the original driving mode of the locomotive internal combustion engine needs to be transformed into an electric motor driving mode, and the original axle gear box of the locomotive cannot be used and needs to be redesigned and transformed. In order to maintain consistency, the pull rod arm structure form on the original locomotive axle gear box needs to be designed on the transformed gear box body to maintain the transmission of driving force. After the transformation, the locomotive needs to be driven by four motors to improve the walking control function and reduce the energy consumption and pollution of the locomotive. However, due to the limitation of the space of the locomotive bogie, the existing gear box on the market is difficult to be directly used on the bogie after a small range of modification. How to design a gear box body with small size, light weight and convenient installation and maintenance has become a difficulty. SUMMARY

[0005] In view of the technical problems in the background art, the present application provides a disc type axial flux motor vehicle axle gear box and a design and manufacturing method thereof.

[0006] The technical solutions of the present application for solving the technical problems are as follows:

[0007] The disc type axial flux motor vehicle axle gear box comprises a pull rod arm, a lower bottom box, a middle box and an upper cover box which are sequentially detachably connected and have an upper open box structure, an upper and lower open box structure and a lower open box structure respectively, a vehicle axle mounting hole and a first transmission ratio gear shaft hole are arranged between the lower bottom box and the middle box, a second transmission ratio gear shaft hole and a disc type axial flux motor mounting hole are arranged between the middle box and the upper cover box, the included angle between the center line of the vehicle axle mounting hole and the first transmission ratio gear shaft hole and the center line of the second transmission ratio gear shaft hole and the disc type axial flux motor mounting hole is an acute angle, the center line of the first transmission ratio gear shaft hole and the second transmission ratio gear shaft hole is perpendicular to the center line of the second transmission ratio gear shaft hole and the disc type axial flux motor mounting hole, and the pull rod arm is arranged on the middle box.

[0008] Further, the included angle between the center line of the vehicle axle mounting hole and the first transmission ratio gear shaft hole and the center line of the second transmission ratio gear shaft hole and the disc type axial flux motor mounting hole is 25°.

[0009] Further, the center line of the vehicle axle mounting hole and the first transmission ratio gear shaft hole and the bottom surface of the lower bottom box form an angle of 10°.

[0010] Further, the lower bottom box comprises an upper open box structure composed of a lower bottom box bottom plate and a plurality of lower bottom box side plates, a lower bottom box connecting flange is arranged on the upper opening of the upper open box structure, a vehicle axle hole lower half circular plate and a first transmission ratio gear shaft hole lower half circular plate are respectively arranged on the upper portions of the lower bottom box side plates on both sides of the lower bottom box connecting flange, and the lower bottom box connecting flange is connected with the vehicle axle hole lower half circular plate and the first transmission ratio gear shaft hole lower half circular plate.

[0011] The middle box body comprises an up-and-down open box structure composed of two middle box body side plates, a middle box body first outer side plate and a middle box body second outer side plate between the two middle box body side plates, and a middle box body top plate between one side of the middle box body first outer side plate and the middle box body second outer side plate, a middle box body lower connecting flange and a middle box body upper connecting flange are respectively arranged at the lower opening and the upper opening of the up-and-down open box structure, a vehicle axle hole upper semicircular plate and a first transmission ratio tooth shaft hole upper semicircular plate are respectively arranged on the lower part of the two middle box body side plates, a motor mounting hole lower semicircular plate and a second transmission ratio tooth shaft hole lower semicircular plate are respectively arranged on the upper part of one of the middle box body side plates and the middle box body top plate, the vehicle axle hole upper semicircular plate and the first transmission ratio tooth shaft hole upper semicircular plate are connected with the middle box body lower connecting flange, and the motor mounting hole lower semicircular plate and the second transmission ratio tooth shaft hole lower semicircular plate are connected with the middle box body upper connecting flange.

[0012] The upper cover box comprises a lower open box structure composed of two upper cover box side plates and an upper cover box top plate between the two upper cover box side plates, and an upper cover box connecting flange is arranged at the lower opening of the lower open box structure, a motor mounting hole upper semicircular plate and a second transmission ratio tooth shaft hole upper semicircular plate are respectively arranged on the lower part of the two upper cover box side plates, and the motor mounting hole upper semicircular plate and the second transmission ratio tooth shaft hole upper semicircular plate are connected with the upper cover box connecting flange.

[0013] The vehicle axle hole lower semicircular plate and the vehicle axle hole upper semicircular plate constitute the vehicle axle mounting hole, the first transmission ratio tooth shaft hole lower semicircular plate and the first transmission ratio tooth shaft hole upper semicircular plate constitute the first transmission ratio tooth shaft hole, the second transmission ratio tooth shaft hole lower semicircular plate and the second transmission ratio tooth shaft hole upper semicircular plate constitute the second transmission ratio tooth shaft hole, and the motor mounting hole lower semicircular plate and the motor mounting hole upper semicircular plate constitute the disc type axial flux motor mounting hole; the lower bottom box body connecting flange is detachably connected with the middle box body lower connecting flange, and the middle box body upper connecting flange is detachably connected with the upper cover box connecting flange.

[0014] Further, a lubricating device mounting plate is arranged on the lower bottom box body bottom plate, a plurality of oil discharge holes are arranged on the lubricating device mounting plate, and a lubricating device mounting hole is arranged on the lubricating device mounting plate; a refueling device mounting hole is arranged on the lower bottom box body side plate of the lower box body, and a refueling device mounting flange is arranged outside the refueling device mounting hole; the pull rod arm is arranged outside the vehicle axle hole upper semicircular plate; an inspection hole is arranged on the upper cover box, and an inspection hole flange is arranged outside the inspection hole.

[0015] Further, the motor mounting hole lower half plate and the second transmission ratio gear shaft hole lower half plate are integrated structures, constituting a middle box lower half hole connecting part; the motor mounting hole upper half plate and the second transmission ratio gear shaft hole upper half plate are integrated structures, constituting an upper cover box upper half hole connecting part; the middle box lower half hole connecting part and the upper cover box upper half hole connecting part correspondingly have mounting holes in the middle part and are detachably connected through fasteners.

[0016] Further, the axle hole lower half plate and the first transmission ratio gear shaft hole lower half plate are provided between the lower bottom box side plate and the axle hole upper half plate and the first transmission ratio gear shaft hole upper half plate are provided between the middle box side plate and the middle box lower half hole connecting part and the middle box top plate on the same side.

[0017] Further, the axle hole lower half plate and the first transmission ratio gear shaft hole lower half plate are provided between the lower bottom box side plate and the axle hole upper half plate and the first transmission ratio gear shaft hole upper half plate are provided between the middle box side plate and the middle box lower half hole connecting part and the middle box top plate on the same side.

[0018] A design and manufacturing method of the disc type axial flux motor axle gear box, comprising the following steps:

[0019] S1, preparation before welding:

[0020] S1.1, welding equipment: HT400D or HT500D digital control inverter type manual electrode arc welding and argon arc welding combined with DC welding machine, Φ3.2mm and φ4.0mm E5015 electrode; welding material: structural steel electrode, carbon arc gas planer ZX5-630 welding machine cooperates with plasma gas planer LGK-100MA

[0021] S1.2, heating device: H01-20 baking gun;

[0022] S1.3, auxiliary facilities: angle grinder, file, hammer, spatula, mask, template, temperature meter, magnifying glass, heat preservation cotton;

[0023] S1.4, welding material: body 16Mn low alloy steel;

[0024] S1.5, requirements for pre-welding: the welding surface is processed and cleaned by manual angle grinder to remove rust, grease and moisture, and the thick plate needs to be preheated to 150 degrees;

[0025] S1.6, welding position: K groove;

[0026] S1.7, welding requirements: all welding layers must be free of any welding defects and fused to the base material;

[0027] S1.8, welding process parameters: according to the welding equipment, welding material, welding material quality and welding requirement to make welding parameter; when welding primer layer, electrode adopts E5015 electrode with diameter of 3.2mm, welding current is 90-120A, arc voltage is 23±1V, and welding speed is 15±1cm / min; when welding filling layer and cover layer, electrode adopts E5015 electrode with diameter of 4.0mm, welding current is 130-160A, arc voltage is 26±1V, and welding speed is 17±1cm / min;

[0028] S2, welding production:

[0029] S2.1, first according to the design shape and size of the mechanical processing constitutes all the axle hole lower bottom box lower half plate, the first transmission ratio gear shaft hole lower half plate, the lower bottom box bottom plate, the lower bottom box side plate, the lower bottom box connecting flange, lubricating device installation plate and the rib plate, lubricating device installation hole is opened on the lubricating device installation plate, the oiling device installation hole is opened on the lower bottom box side plate, the single face 30°bevel is respectively mechanically processed on each side of each lower bottom box side plate, so that all the connecting parts can form K bevel double-sided welding when assembling; then according to the structure of the lower bottom box, the prepared plates are welded and assembled, the axle hole lower half plate and the first transmission ratio gear shaft hole lower half plate are used as positioning reference, the lower bottom box side plate is fixed below the axle hole lower half plate and the first transmission ratio gear shaft hole lower half plate, the lower bottom box bottom plate and the lubricating device installation plate are installed at the bottom of the lower bottom box side plate and are fixed by spot welding to form a basic frame, then the basic frame is corrected according to the size of the lower bottom box, the lower bottom box side plate between the existing lower bottom box side plate is fixed by spot welding, finally the lower bottom box connecting flange and the rib plate are fixed by precision assembling and spot welding; after the overall structure frame is fixed by spot welding according to the design size, welding is carried out; during welding, the lower bottom box all outside spot welding connection is welded first, the welding method is manual electrode arc welding, and symmetrical welding is adopted on the outer two sides, because the axle hole lower half plate, the first transmission ratio gear shaft hole lower half plate and the lower bottom box connecting flange plate are relatively thick, the groove on both sides of the connection before welding is preheated to about 150℃, after the temperature reaches, the digital control inverter type manual electrode arc welding and argon arc welding are combined with direct current welding machine, and E5015 structural steel electrode with diameter of 3.2mm is selected for symmetrical single bottom full position welding, the current is 120A, the electrode moving method is straight line moving method, the weld also ensures good fusion with both sides while penetrating the bottom, after the bottom welding, the surface is confirmed to be free of any welding defects by using ultrasonic stress relief, then the interlayer temperature is controlled, and then the filling and cover layer overall welding is carried out, the diameter is 4.The E5015 structural steel electrode with 0mm is selected between 130-140A for the filling and cover layer welding current, especially the first layer filling layer current is larger, which is convenient for eliminating the bottom layer defects, the electrode adopts the triangular operation method, the electrode angle is changed according to the surfacing position, after the filling layer is completely welded, the ultrasonic stress relief is adopted, the surface is confirmed to be free of any welding defects by visual observation or 10 times magnifying glass, then the surface welding of the cover layer is carried out, the cover layer must meet the design of the welding angle size and the bite between the two sides cannot be generated, after the whole welding is completed, the ultrasonic stress relief is carried out, then the whole outside weld is covered by the heat preservation cotton; then the welding of the welding and fixed connection of all the inner mouth points of the lower bottom box is carried out, the carbon arc gas planer ZX5-630 welding machine is used to cooperate with the plasma gas planer LGK-100MA to carry out the inner mouth welding and fixed connection of the welding and fixed connection, after confirming that there is no any defect, the welding is carried out, the welding method and process and welding size of the inner mouth welding are the same as those of the outside connection, after the whole welding is completed, the ultrasonic stress relief is carried out, the welding is covered by the heat preservation cotton and then cooled to room temperature, the manual angle grinder is used for surface cleaning, finally, the detection and flaw detection of all the welds are carried out.

[0030] S2.2, first according to the design shape and size of the mechanical processing of all the axle hole upper semicircular plate, the first transmission ratio gear shaft hole upper semicircular plate, the middle box first outer side plate, the middle box side plate, the middle box lower connecting flange, the middle box upper connecting flange, the motor mounting hole lower semicircular plate and the second transmission ratio gear shaft hole lower semicircular plate constitute the middle box lower semicircular hole connecting part, the middle box second outer side plate, the middle box top plate, the rib plate and the pull rod arm; On each side of the middle box first outer side plate, the middle box side plate, the middle box second outer side plate, the middle box top plate, double-sided mechanical processing of single-sided 30° bevel, so that when the group is connected, all the connections can form K bevel double-sided welding; Then according to the structure of the middle box, weld and assemble the processed parts, take the axle hole upper semicircular plate, the first transmission ratio gear shaft hole upper semicircular plate and the second transmission ratio gear shaft hole lower semicircular plate and the middle box lower semicircular hole connecting part as the positioning reference, spot weld the middle box side plate at the middle part of each lower semicircular plate and upper semicircular plate to form a basic frame and correct it to meet the design size, then spot weld the middle box first outer side plate, the middle box second outer side plate and the middle box top plate between them, then spot weld the pull rod arm, and finally spot weld the middle box lower connecting flange, the middle box upper connecting flange and each rib plate; After the overall structure frame is spot welded and fixed according to the design size, weld it; When welding, first weld all the outer spot welded connections of the middle box, the welding method is manual electrode arc welding, and the outer two sides are symmetrically welded. Because the middle box lower semicircular hole connecting part composed of the axle hole upper semicircular plate, the first transmission ratio gear shaft hole upper semicircular plate, the middle box lower connecting flange, the middle box upper connecting flange, the motor mounting hole lower semicircular plate and the second transmission ratio gear shaft hole lower semicircular plate and the pull rod arm plate are relatively thick, preheat the bevels on both sides of the connection to about 150℃ before welding, after the temperature reaches, use the digital control inverter manual electrode arc welding and argon arc welding combined with a direct current welding machine and select a diameter of 3.2mm E5015 structural steel electrode to perform symmetric single-sided full-position welding, the current is 120A, and the electrode moving method is straight line moving. While melting through the bottom, the weld also needs to ensure good fusion with the two sides. After the bottom layer welding, use ultrasonic to eliminate stress and confirm that the surface has no welding defects, then control the interlayer temperature, and then perform overall welding of the filling and cover layer, use a diameter of 4.The E5015 structural steel electrode with 0mm is selected between 130-140A for the filling and cover layer welding current, especially the first layer filling layer current is larger, which is convenient for eliminating the bottom layer defects, the electrode adopts the triangular operation method, the electrode angle is changed according to the surfacing position, after the filling layer is completely welded, the ultrasonic stress relief is adopted, the surface is confirmed to be free of any welding defects by visual observation or 10 times magnifying glass, then the surface welding of the cover layer is carried out, the cover layer must meet the design of the welding angle size and the bite between the two sides cannot be generated, after the whole welding is completed, the ultrasonic stress relief is carried out, then the whole outside weld is covered by the heat preservation cotton; then the welding of the welding and fixed connection of all inner port points of the middle box body is carried out, the carbon arc gas planer ZX5-630 welding machine is used to cooperate with the plasma gas planer LGK-100MA to carry out the root cleaning of the welding and fixed connection of the inner port points before the welding, after confirming that there is no any defect, the welding is carried out, the welding method and process and the welding size of the inner port welding are the same as those of the outside connection, after the whole welding is completed, the ultrasonic stress relief is carried out, the welding is covered by the heat preservation cotton and then cooled to room temperature, the manual angle grinder is used to carry out the surface cleaning, finally, the detection and flaw detection of all welds are carried out.

[0031] S2.3, first according to the design shape and size of the mechanical processing of the upper cover box all the upper cover box side plate, the upper cover box top plate, the upper cover box connecting flange, the motor mounting hole upper semicircular plate, the second transmission ratio tooth shaft hole upper semicircular plate constitute the upper cover box upper semicircular hole connecting part, set up inspection hole in the upper cover box top plate, each side of each upper cover box side plate and the upper cover box top plate is double-sided mechanical processing single 30° groove, so that the group can form K groove double-sided welding when all the connecting part; then according to the upper cover box welding assembly of each plate, the upper cover box upper semicircular hole connecting part of the motor mounting hole upper semicircular plate and the second transmission ratio tooth shaft hole upper semicircular plate as the positioning reference, spot welding of each semicircular plate on the top position of each upper cover box side plate to form a basic frame and carry out size correction, spot welding of the upper cover box top plate, finally precision group spot welding of the upper cover box connecting flange; after the overall structure frame is spot welded according to the design size, welding is carried out again; when welding, first weld all the outside spot welding connection of the upper cover box, the welding method is selected by manual electrode arc welding, and symmetrical welding is adopted on the outside. Because the upper cover box upper semicircular hole connecting part composed of the motor mounting hole upper semicircular plate and the second transmission ratio tooth shaft hole upper semicircular plate and the upper cover box connecting flange plate are relatively thick, the groove on both sides of the connecting part is preheated to about 150 DEG C before welding, and after the temperature reaches, the digital control inverter type manual electrode arc welding and argon arc welding are combined to use a direct current welding machine, and a diameter of 3.2 mm E5015 structural steel electrode is selected to carry out symmetrical single-sided full position welding, the current is 120 A, and the electrode moving method is linear electrode moving method. While melting through the bottom, the weld also needs to ensure good fusion with both sides. After the bottom layer is welded, the stress is eliminated by ultrasonic wave, and it is confirmed that there is no any welding defect on the surface. Then the interlayer temperature is controlled, and the filling and cover layer overall welding is carried out. The diameter of the E5015 structural steel electrode is 4.0 mm, the filling and cover layer welding current is selected between 130 A and 140 A, especially the current of the first filling layer is larger, which is convenient for eliminating the defects of the bottom layer. The electrode moving method is triangular, the electrode included angle changes according to the position of the surfacing. After the filling layer is completely welded, the stress is eliminated by ultrasonic wave, and it is confirmed that there is no any welding defect on the surface by visual inspection or 10 times magnifying lens. Then the welding of the cover layer surface is carried out. The cover layer must meet the design welding angle size and cannot produce edge biting between both sides. After the overall welding is completed, the stress is eliminated by ultrasonic wave, and then the overall outside weld is covered by heat preservation cotton. Then the welding of all the inner hole spot welding connection of the upper cover box is carried out. Before welding, the carbon arc gas planer ZX5-630 welding machine is used to cooperate with the plasma gas planer LGK-100MA to clean the inner hole spot welding connection. After it is confirmed that there is no any defect, the welding is carried out. The welding method and process and welding size of the inner hole are the same as those of the outside connection. After the overall welding is completed, the stress is eliminated by ultrasonic wave, the weld is covered by heat preservation cotton and cooled to room temperature, the surface is cleaned by manual angle grinder, and finally the detection of all the welds is carried out;

[0032] S2.4, the lower bottom box body connecting flange and the middle box body lower connecting flange, the middle box body upper connecting flange and the upper cover box body connecting flange, the middle box body lower semicircular hole connecting part and the upper cover box body upper semicircular hole connecting part are connected by bolts to make the lower bottom box body, the middle box body and the upper cover box body into an integral structure frame, then the integral structure frame is sent into the furnace for integral stress relief and deformation heat treatment, finally the holes on the integral structure frame are integrally machined by mechanical equipment, and the integral structure frame is delivered for use.

[0033] Compared with the prior art, the disc type axial flux motor vehicle axle gear box body has novel design and reasonable structure, and through the sequentially connected lower bottom box body, middle box body and upper cover box body and the axle mounting hole, first transmission ratio gear shaft hole, second transmission ratio gear shaft hole and disc type axial flux motor mounting hole formed by the three box body structures, a gear box body with small volume, light weight, low cost and convenient axle, transmission ratio gear shaft and motor installation and maintenance can be installed on the original vehicle bogie, and the manufacturing method thereof can effectively ensure the stability of the gear box body during use and prolong the service life of the gear box body. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a front view structural schematic diagram of the disc type axial flux motor vehicle axle gear box body in the application;

[0035] Figure 2 It is a rear view structural schematic diagram of the disc type axial flux motor vehicle axle gear box body in the application;

[0036] Figures 3-7 It is a three-dimensional structural schematic diagram of the disc type axial flux motor vehicle axle gear box body in the application at different angles;

[0037] Figures 8-9 It is a structural schematic diagram of the lower bottom box body in the application at different angles;

[0038] Figures 10-11 It is a structural schematic diagram of the middle box body in the application at different angles;

[0039] Figures 12-13 It is a structural schematic diagram of the upper cover box body in the application at different angles;

[0040] Figures 14-16 It is a structural schematic diagram of the gear box in the application at different angles;

[0041] Figure 17 It is a structural schematic diagram of the bogie in the application;

[0042] In the figure: 1, lower bottom box; 11, axle hole lower half round plate; 12, first transmission ratio gear shaft hole lower half round plate; 13, lower bottom box bottom plate; 14, lower bottom box side plate; 15, lower bottom box connecting flange; 16, lubricating device mounting plate; 161, oil pan; 17, lubricating device mounting hole; 18, oil drain hole; 181, oil drain plug; 2, middle box; 21, axle hole upper half round plate; 22, first transmission ratio gear shaft hole upper half round plate; 23, middle box first outer side plate; 24, middle box side plate; 25, middle box lower connecting flange; 26, middle box upper connecting flange; 27, motor mounting hole lower half round plate; 28, second transmission ratio gear shaft hole lower half round plate; 29, middle box lower half round hole connecting part; 210, middle box second outer side plate; 211, middle box top plate; 3, upper cover box; 32, upper cover box side plate; 33, upper cover box top plate; 34, inspection hole; 341, inspection hole flange; 36, upper cover box connecting flange; 37, motor mounting hole upper half round plate; 38, second transmission ratio gear shaft hole upper half round plate; 39, upper cover box upper half round hole connecting part; 4, pull rod arm; 5, rib plate; 6, oiling device mounting hole; 61, oiling device mounting flange; 62, oil scale flange; 63, oil scale; 7, inspection device; 71, inspection hole cover; 72, inspection hole cover gasket; 73, air vent hole; 8, disc type axial flux motor; 9, wheel axle structure. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the general meaning understood by those skilled in the art to which the present disclosure belongs. The "upper", "lower", "left", "right", "front", "back" and the like used in the patent application description and claims of the present disclosure are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship also changes accordingly; "connection" or "connection" and the like are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. The details of the present application are not described, which are the known technology of those skilled in the art.

[0044] Embodiment 1

[0045] As Figures 1-3As shown, the present invention provides a disc-type axial flux motor axle gear box, comprising a pull rod arm 4 and a lower bottom box 1, a middle box 2 and an upper cover box 3 which are detachably connected in sequence and have upper opening, upper and lower opening and lower opening box-like structures respectively. An axle mounting hole A and a first transmission ratio gear shaft hole B are commonly provided between the lower bottom box 1 and the middle box 2, and a second transmission ratio gear shaft hole C and a disc-type axial flux motor mounting hole D are commonly provided between the middle box 2 and the upper cover box 3. The angle between the line connecting the centers of the axle mounting hole A and the first transmission ratio gear shaft hole B and the line connecting the centers of the second transmission ratio gear shaft hole C and the disc-type axial flux motor mounting hole D is an acute angle, and the line connecting the centers of the first transmission ratio gear shaft hole B and the second transmission ratio gear shaft hole C is perpendicular to the line connecting the centers of the second transmission ratio gear shaft hole C and the disc-type axial flux motor mounting hole D. The pull rod arm 4 is provided on the middle box 2.

[0046] Preferably, the angle between the line connecting the centers of the axle mounting hole A and the first gear ratio gear shaft hole B and the line connecting the centers of the second gear ratio gear shaft hole C and the disc-type axial flux motor mounting hole D is 25°.

[0047] Preferably, a line connecting the centers of the axle mounting hole A and the first transmission ratio gear shaft hole B forms an angle of 10° with the bottom surface of the lower box body 1 .

[0048] like Figures 14-16 As shown, the axle mounting hole A in this embodiment is used to install the wheel axle structure 9 for running on the track. The first transmission ratio gear shaft hole B and the second transmission ratio gear shaft hole C are respectively used to install the transmission ratio gears. The disc axial flux motor mounting hole D is used to install the disc axial flux motor 8, which provides driving force and transmits the driving force to the wheel axle structure 9 through the transmission ratio gears. After the disc axial flux motor axle gear box body described in this embodiment is installed with the above components, a gear box with driving capability is formed, which can be installed on the running frame of the locomotive. Figure 17 As shown, the traveling frame 200 is the original locomotive traveling frame, and the front and rear spaces are used to install the assembled gear box. Pull rods 201 are set on the front and rear of the traveling frame 200. The pull rod arm 4 on the gear box body is consistent with the specifications of the original pull rod arm and is set on the gear box body and is convenient for connection with the pull rod 201. The driving force provided by the disc axial flux motor 8 is finally transmitted to the axle structure 9, and the traveling frame 200 is driven to run through the axle structure 9, and the pulling rod arm 4 and the pulling rod 201 are used to drive the locomotive to run on the track.

[0049] Example 2:

[0050] The lower bottom box 1 comprises an upper open box structure composed of a lower bottom box bottom plate 13 and a plurality of lower bottom box side plates 14, the upper opening of the upper open box structure is provided with a lower bottom box connecting flange 15, the lower bottom box side plates 14 on both sides of the upper opening are respectively provided with a lower half circular plate 11 of an axle hole and a lower half circular plate 12 of a first transmission ratio gear shaft hole, and the lower bottom box connecting flange 15 is connected with the lower half circular plate 11 of the axle hole and the lower half circular plate 12 of the first transmission ratio gear shaft hole;

[0051] The middle box 2 comprises an upper and lower open box structure composed of two middle box side plates 24, a middle box first outer side plate 23 and a middle box second outer side plate 210 between the two middle box side plates 24, and a middle box top plate 211 between one side of the middle box first outer side plate 23 and the middle box second outer side plate 210, the lower opening and the upper opening of the upper and lower open box structure are respectively provided with a middle box lower connecting flange 25 and a middle box upper connecting flange 26, the lower portions of the two middle box side plates 24 are respectively provided with an upper half circular plate 21 of an axle hole and an upper half circular plate 22 of a first transmission ratio gear shaft hole, the upper portions of one of the middle box side plates 24 and the middle box top plate 211 are respectively provided with a lower half circular plate 27 of a motor mounting hole and a lower half circular plate 28 of a second transmission ratio gear shaft hole, the upper half circular plate 21 of the axle hole and the upper half circular plate 22 of the first transmission ratio gear shaft hole are connected with the middle box lower connecting flange 25, and the lower half circular plate 27 of the motor mounting hole and the lower half circular plate 28 of the second transmission ratio gear shaft hole are connected with the middle box upper connecting flange 26;

[0052] The upper cover box 3 comprises a lower open box structure composed of two upper cover box side plates 32 and an upper cover box top plate 33 between the two upper cover box side plates 32, the lower opening of the lower open box structure is provided with an upper cover box connecting flange 36, the lower portions of the two upper cover box side plates 32 are respectively provided with an upper half circular plate 37 of a motor mounting hole and an upper half circular plate 38 of a second transmission ratio gear shaft hole, and the upper half circular plate 37 of the motor mounting hole and the upper half circular plate 38 of the second transmission ratio gear shaft hole are connected with the upper cover box connecting flange 36;

[0053] The axle hole lower half circular plate 11 and the axle hole upper half circular plate 21 constitute the axle mounting hole A, the first transmission ratio gear shaft hole lower half circular plate 12 and the first transmission ratio gear shaft hole upper half circular plate 22 constitute the first transmission ratio gear shaft hole B, the second transmission ratio gear shaft hole lower half circular plate 28 and the second transmission ratio gear shaft hole upper half circular plate 38 constitute the second transmission ratio gear shaft hole C, and the motor mounting hole lower half circular plate 27 and the motor mounting hole upper half circular plate 37 constitute the disc type axial flux motor mounting hole D.

[0054] In the embodiment, the lower bottom box body bottom plate 13 is provided with a lubricating device mounting plate 16 and a plurality of oil drain holes 18, the lubricating device mounting plate 16 is provided with lubricating device mounting holes 17, and an oil bottom plate 161 can be mounted on the lubricating device mounting plate 16. Figure 16 As shown in the figure, the lubricating device mounting plate 16 can be mounted on the lubricating device, and the lubricating device can be put into the inside of the lower bottom box body 1 from the lubricating device mounting hole 17. Figure 16 As shown in the figure, the lubricating device mounting plate 16 can be mounted on the lubricating device, and the lubricating device can be put into the inside of the lower bottom box body 1 from the lubricating device mounting hole 17. Figure 15 As shown in the figure, the lubricating device mounting plate 16 can be mounted on the lubricating device, and the lubricating device can be put into the inside of the lower bottom box body 1 from the lubricating device mounting hole 17. The pull rod arm 4 is arranged outside the axle hole upper half circular plate 21, the upper cover box body 1 is provided with an inspection hole 34, the outside of the inspection hole 34 is provided with an inspection hole flange 341, an inspection device 7 can be mounted on the inspection hole flange 341, the inspection device includes an inspection hole cover 71 and an inspection hole cover sealing gasket 72, and a gas permeable hole 73 can be arranged on the inspection hole cover 71.

[0055] In the embodiment, in order to facilitate design and installation, the motor mounting hole lower half circular plate 27 and the second transmission ratio gear shaft hole lower half circular plate 28 are integrated structures, constituting a middle box body lower half circular hole connecting part 29, the motor mounting hole upper half circular plate 37 and the second transmission ratio gear shaft hole upper half circular plate 38 are integrated structures, constituting an upper cover box body upper half circular hole connecting part 39, and the middle part of the middle box body lower half circular hole connecting part 29 and the upper cover box body upper half circular hole connecting part 39 correspondingly provided with mounting holes and detachably connected through fasteners.

[0056] In this embodiment, to maintain the stability of the entire box, the axle hole lower half plate 11 and the first transmission ratio gear shaft hole lower half plate 12 are provided with a plurality of rib plates 5 between the lower bottom box side plate 14, the axle hole upper half plate 21 and the first transmission ratio gear shaft hole upper half plate 22 and the middle box side plate 24, and the middle box lower half hole connecting part 29 and the same side of the middle box top plate 211. The width of the axle hole lower half plate 11 and the axle hole upper half plate 21 of one side of the lower bottom box 1 and the middle box 2 is greater than that of the other side.

[0057] In this embodiment, the axle hole lower half plate 11 and the first transmission ratio gear shaft hole lower half plate 12 are cut and bent from 50mm steel plate, the lower bottom box bottom plate 13 is cut and processed from 40mm steel plate, the lower bottom box side plate 14 is cut and processed from 20mm steel plate, the lower bottom box connecting flange 15 is cut and processed from 60mm steel plate, the lubricating device mounting plate 16 is cut and processed from 30mm steel plate, and the rib plate 5 is cut and processed from 30mm steel plate; the middle box lower half hole connecting part 29 composed of the axle hole upper half plate 21, the first transmission ratio gear shaft hole upper half plate 22, the motor mounting hole lower half plate 27 and the second transmission ratio gear shaft hole lower half plate 28 is cut and processed from 50mm steel plate, the middle box first outer side plate 23, the middle box side plate 24, the middle box second outer side plate 210 and the middle box top plate 211 are cut and processed from 30mm steel plate, the pull rod arm 4 is cut and processed from 60mm steel plate, the middle box lower connecting flange 25 and the middle box upper connecting flange 26 are cut and processed from 60mm steel plate, the upper cover box side plate 32 and the upper cover box top plate 33 are cut and processed from 20mm steel plate, the upper cover box connecting flange 36 is cut and processed from 60mm steel plate, and the upper cover box upper half hole connecting part 39 composed of the motor mounting hole upper half plate 37 and the second transmission ratio gear shaft hole upper half plate 38 is cut and processed from 50mm steel plate.

[0058] Embodiment 3:

[0059] Based on the design and manufacturing method of the axle gear box of the disc type axial flux motor vehicle in embodiment 2, the lower bottom box 1, the middle box 2 and the upper cover box 3 are welded and manufactured first, then stress relief and heat treatment are carried out, and finally mechanical machining is carried out, the specific steps are as follows:

[0060] S1, preparation before welding:

[0061] S1.1, welding equipment: HT400D or HT500D digital control inverter type manual welding and argon arc welding combined DC welding machine, Φ3.2mm and φ4.0mm E5015 welding rod; welding material: structural steel welding rod, carbon arc gas planer ZX5-630 welding machine matched with plasma gas planer LGK-100MA

[0062] S1.2, heating device: H01-20 baking gun;

[0063] S1.3, auxiliary facilities: angle grinder, file, hammer, spatula, mask, template, temperature meter, magnifying glass, heat preservation cotton;

[0064] S1.4, welding material: body 16Mn low alloy steel;

[0065] S1.5, welding requirement before welding: the welding surface is processed and cleaned by manual angle grinder to remove rust, grease and moisture, and the thick plate needs to be preheated to 150 degrees;

[0066] S1.6, welding position: K groove;

[0067] S1.7, welding requirement: all welding layers must be free of any welding defects and fused to the base material;

[0068] S1.8, welding process parameters: the welding parameters are determined according to the welding equipment, welding material, welding material quality and welding requirement;

[0069] Welding process parameters

[0070]

[0071] Welding process route: component manufacturing and assembly--preheating before welding--K groove cleaning and symmetrical fusion welding--controlling deformation and installation size--local assembly--overall assembly--overall entering the furnace for post-weld heat treatment--overall machining--local installation of spare parts device--inspection and acceptance--delivery for use.

[0072] S2, welding manufacturing:

[0073] S2.1, first according to the design shape and size of the mechanical processing constitutes the lower bottom box 1 all axle hole lower half round plate 11, the first transmission ratio gear shaft hole lower half round plate 12, the lower bottom box bottom plate 13, the lower bottom box side plate 14, the lower bottom box connecting flange 15, the lubricating device mounting plate 16 and the rib plate 5, the lubricating device mounting hole 17 is opened on the lubricating device mounting plate 16, the oiling device mounting hole 6 is opened on the lower bottom box side plate 14, the single side 30° bevel is respectively mechanically processed on each side of each lower bottom box side plate 14, so that all the connecting parts can form K bevel double-sided welding when assembling; then according to the structure of the lower bottom box 1, the prepared plates are welded and assembled, the axle hole lower half round plate 11 and the first transmission ratio gear shaft hole lower half round plate 12 are used as positioning reference, the lower bottom box side plate 14 is fixed by spot welding below the axle hole lower half round plate 11 and the first transmission ratio gear shaft hole lower half round plate 12, the lower bottom box bottom plate 13 and the lubricating device mounting plate 16 are installed on the bottom of the lower bottom box side plate 14 and fixed by spot welding to form a basic frame, then the lower bottom box side plate 14 between the existing lower bottom box side plate 14 is fixed by spot welding after the basic frame is corrected according to the size of the lower bottom box 1, finally the lower bottom box connecting flange 15 and the rib plate 5 are precisely assembled and fixed by spot welding; after the overall structure frame is fixed by spot welding according to the design size, welding is carried out; during welding, all the outside spot welding connection parts of the lower bottom box 1 are welded first, the welding method is manual electrode arc welding, and symmetrical welding is adopted on the outer two sides, because the axle hole lower half round plate 11, the first transmission ratio gear shaft hole lower half round plate 12 and the lower bottom box connecting flange 15 are relatively thick, the two sides of the bevel of the connection part are preheated to about 150 DEG C before welding, after the temperature reaches, the digital control inverter type manual electrode arc welding and argon arc welding are combined to use a direct current welding machine, and an E5015 structural steel electrode with a diameter of 3.2 mm is selected to carry out symmetrical single-sided full-position welding, the current is 120 A, the electrode is moved in a straight line, the weld also ensures good fusion with the two sides while penetrating the bottom, after the bottom layer welding, the surface is confirmed to be free of any welding defects by using ultrasonic stress relief, then the interlayer temperature is controlled, and then the filling and cover layer overall welding is carried out, a diameter of 4.The E5015 structural steel electrode with 0mm is selected between 130-140A for the filling and cover layer welding current, especially the first layer filling layer current is larger, which is convenient for eliminating the bottom layer defects, the electrode adopts the triangular operation method, the electrode angle is changed according to the surfacing position, after the filling layer is completely welded, the ultrasonic stress relief is adopted, the surface is confirmed to be free of any welding defects by visual observation or 10 times magnifying glass, then the surface welding of the cover layer is carried out, the cover layer must meet the design of the welding angle size and the bite between the two sides cannot be generated, after the whole welding is completed, the ultrasonic stress relief is carried out, then the whole outside weld is covered by the heat preservation cotton; then the welding of the welding fixed connection of all the inner mouth points of the lower bottom box 1 is carried out, the carbon arc gas planer ZX5-630 welding machine is used to cooperate with the plasma gas planer LGK-100MA to carry out the inner mouth welding fixed connection of the welding root, after confirming that there is no any defect, the welding is carried out, the welding method and process and the welding size of the inner mouth welding are the same as those of the outside connection, after the whole welding is completed, the ultrasonic stress relief is carried out, the welding is covered by the heat preservation cotton and then cooled to room temperature, the manual angle grinder is used for surface cleaning, finally, the detection of all the welds is carried out.

[0074] S2.2, first according to the design shape and size of the mechanical processing of all the axle hole upper semicircular plate 21, the first transmission ratio gear shaft hole upper semicircular plate 22, the middle box first outer side plate 23, the middle box side plate 24, the middle box lower connecting flange 25, the middle box upper connecting flange 26, the motor mounting hole lower semicircular plate 27 and the second transmission ratio gear shaft hole lower semicircular plate 28 constitute the middle box lower semicircular hole connecting part 29, the middle box second outer side plate 210, the middle box top plate 211, the rib plate 5 and the pull rod arm 4; In each of the middle box first outer side plate 23, the middle box side plate 24, the middle box second outer side plate 210, the middle box top plate 211, the double-sided mechanical processing of each side is 30°, so that all the connecting parts can form K groove double-sided welding when assembling; Then according to the structure of the middle box 2, weld and assemble the processed parts, take the axle hole upper semicircular plate 21, the first transmission ratio gear shaft hole upper semicircular plate 22, the second transmission ratio gear shaft hole lower semicircular plate 28 and the middle box second outer side plate 210 as the positioning reference, spot weld and fix the middle box side plate 24 at the middle part of each semicircular plate and semicircular plate to form a basic frame and correct it to meet the design size, then spot weld and fix the middle box first outer side plate 23, the middle box second outer side plate 210 and the middle box top plate 211 between them, then spot weld and fix the pull rod arm 4, and finally spot weld and fix the middle box lower connecting flange 25, the middle box upper connecting flange 26 and each rib plate 5; After the overall structure frame is spot welded and fixed according to the design size, weld; When welding, first weld all the outer spot welded and fixed connecting parts of the middle box 2, the welding method is manual electrode arc welding, and the outer two sides are symmetrically welded, because the axle hole upper semicircular plate 21, the first transmission ratio gear shaft hole upper semicircular plate 22, the middle box lower connecting flange 25, the middle box upper connecting flange 26, the motor mounting hole lower semicircular plate 27 and the second transmission ratio gear shaft hole lower semicircular plate 28 constitute the middle box lower semicircular hole connecting part 29 and the pull rod arm 4 plate, the preheating temperature of the groove on both sides of the connecting part is about 150℃ before welding, after the temperature reaches, the digital control inverter type manual electrode arc welding and argon arc welding are combined with a direct current welding machine, and an E5015 structural steel electrode with a diameter of 3.2mm is selected for symmetric single-sided all-position welding, the current is 120A, and the electrode moving method is straight line moving, which ensures that the weld also fuses well with the two sides while penetrating the bottom, after the bottom layer welding, the surface is confirmed to be free of any welding defects by ultrasonic stress relief, then control the interlayer temperature, and then weld and cover the whole layer, adopt a diameter of 4.The E5015 structural steel electrode with 0mm is selected between 130-140A for the filling and cover layer welding current, especially the first layer filling layer current is larger, which is convenient for eliminating the bottom layer defects. The electrode is used by the triangular operation method, the electrode angle is changed according to the surfacing position. After the filling layer is completely welded, the ultrasonic stress relief is used. After the surface is confirmed to have no any welding defects by visual observation or 10 times magnifying glass, the surface welding of the cover layer is carried out. The cover layer must meet the design of the welding angle size and cannot produce the edge between the two sides. After the whole welding is completed, the ultrasonic stress relief is carried out. Then the whole outside weld is covered by the heat preservation cotton. Then the welding of the welding and fixed connection of all inner mouth points of the middle box body 2 is carried out. The carbon arc gas planer ZX5-630 welding machine is used to cooperate with the plasma gas planer LGK-100MA to carry out the inner mouth welding and fixed connection of the welding and fixed connection of all inner mouth points of the middle box body 2. After the confirmation of no any defects, the welding is carried out. The welding method and process and welding size of the inner mouth welding are the same as those of the outside connection. After the whole welding is completed, the ultrasonic stress relief is carried out. The welding is covered by the heat preservation cotton and then cooled to room temperature. The surface cleaning is carried out by the manual angle grinder. Finally, the detection and flaw detection of all welds are carried out.

[0075] S2.3, first according to the design shape and size of the mechanical processing constitutes all the upper cover box side plate 32, the upper cover box top plate 33, the upper cover box connecting flange 36, the motor mounting hole upper semicircular plate 37, the second transmission ratio gear shaft hole upper semicircular plate 38 constitute the upper cover box upper semicircular hole connecting part 39, the inspection hole 34 is set on the upper cover box top plate 33, the single side 30° groove is respectively mechanically processed on each side of each upper cover box side plate 32 and the upper cover box top plate 33, so that all the connecting parts can form K groove double-sided welding when assembling; then according to the upper cover box 3, the prepared plates are welded and assembled, the motor mounting hole upper semicircular plate 37 and the second transmission ratio gear shaft hole upper semicircular plate 38 of the upper cover box upper semicircular hole connecting part 39 are used as positioning reference, the upper cover box side plate 32 is spot welded and fixed at the upper part of each semicircular plate to form a basic frame and perform size correction, then the upper cover box top plate 33 is spot welded and fixed, finally the upper cover box connecting flange 36 is precisely assembled and spot welded and fixed; after the overall structure frame is completely spot welded and fixed according to the design size, welding is performed; during welding, first weld all the outside spot welded and fixed connecting parts of the upper cover box 3, the welding method is manual electrode arc welding, and symmetrical welding is adopted on the outer two sides, because the motor mounting hole upper semicircular plate 37 and the second transmission ratio gear shaft hole upper semicircular plate 38 constitute the upper cover box upper semicircular hole connecting part 39 and the upper cover box connecting flange 36 plate material is relatively thick, the groove on both sides of the connecting part is preheated to about 150 DEG C before welding, after the temperature reaches, the digital control inverter type manual electrode arc welding and argon arc welding are combined with direct current welding machine, and E5015 structural steel electrode with diameter of 3.2 mm is selected for symmetrical single-sided full-position welding, the current is 120 A, and the electrode moving method is straight line moving method, while melting through the bottom, the weld also needs to ensure good fusion with both sides, after the bottom layer welding, the surface is confirmed to be free of any welding defects by using ultrasonic stress relief, then the interlayer temperature is controlled, and then the filling and cover layer overall welding is performed, the diameter is 4.0mm E5015 structural steel electrode, filling and cover layer welding current between 130-140A, especially the first layer of filling layer current is larger, which is conducive to the elimination of defects in the bottom layer, the electrode is used in triangular operation, the electrode angle is changed according to the position of surfacing, after the filling layer is completely welded, ultrasonic stress relief is used, and after visual or 10 times magnifying glass confirms that the surface is free of any welding defects, the surface welding of the cover layer is carried out, the cover layer must meet the design of the welding angle size and cannot produce the edge between the two sides. After all the welding is completed, the ultrasonic stress relief is carried out, and then the whole is covered with heat preservation cotton covering all the outside welds; Then the welding of the welding of all the inner mouth spot welding fixed connection of the upper cover box body 3 is carried out, the carbon arc gas planer ZX5-630 welding machine is used to cooperate with the plasma gas planer LGK-100MA to clean the inner mouth spot welding fixed connection before welding, and the welding is carried out after confirming that there is no any defect, the welding method and process and welding size of the inner mouth welding are the same as those of the outer side connection, and after all the welding is completed, the ultrasonic stress relief is carried out, the whole is covered with heat preservation cotton covering the welds and then cooled to room temperature, and then the surface is cleaned by hand angle grinder, and finally all the welds are detected and inspected.

[0076] S2.4, the lower bottom box body connecting flange 15 and the middle box body lower connecting flange 25, the middle box body upper connecting flange 26 and the upper cover box body connecting flange 36, the middle box body lower semicircular hole connecting part 29 and the upper cover box body upper semicircular hole connecting part 39 are connected by bolts to connect the lower bottom box body 1, the middle box body 2 and the upper cover box body 3 into an integral structure frame, then the integral structure frame is sent into the furnace for integral stress relief and deformation heat treatment, finally the holes on the integral structure frame are machined by mechanical equipment to ensure the precision installation of the motor and various shaft parts, and after the disc type axial flux motor, various shaft parts, oil filling device, lubricating device, observation device, oil discharge device and the like are installed, it can be put into use.

Claims

1. A disc type axial flux locomotive axle gear box body comprising a draw bar arm (4), characterized in that, The lower bottom box (1), the middle box (2) and the upper cover box (3) are sequentially detachably connected and are respectively an upper opening box, an upper and lower opening box and a lower opening box, the lower bottom box (1) and the middle box (2) are provided with an axle mounting hole (A) and a first transmission ratio gear shaft hole (B) in common, the middle box (2) and the upper cover box (3) are provided with a second transmission ratio gear shaft hole (C) and a disc type axial flux motor mounting hole (D) in common, the included angle between the center line of the axle mounting hole (A) and the first transmission ratio gear shaft hole (B) and the center line of the second transmission ratio gear shaft hole (C) and the disc type axial flux motor mounting hole (D) is an acute angle, the center line of the first transmission ratio gear shaft hole (B) and the second transmission ratio gear shaft hole (C) is perpendicular to the center line of the second transmission ratio gear shaft hole (C) and the disc type axial flux motor mounting hole (D), and the pull rod arm (4) is arranged on the middle box (2); The lower bottom box (1) comprises an upper opening box structure formed by a lower bottom box bottom plate (13) and a plurality of lower bottom box side plates (14), the upper opening of the upper opening box structure is provided with a lower bottom box connecting flange (15), the lower bottom box side plates (14) on the two sides of the lower bottom box connecting flange (15) are respectively provided with an axle hole lower semicircular plate (11) and a first transmission ratio gear shaft hole lower semicircular plate (12) in correspondence, and the lower bottom box connecting flange (15) is connected with the axle hole lower semicircular plate (11) and the first transmission ratio gear shaft hole lower semicircular plate (12) simultaneously; the axle hole lower semicircular plate (11) and the first transmission ratio gear shaft hole lower semicircular plate (12) are made of 50mm steel plates, the lower bottom box bottom plate (13) is made of 40mm steel plates, the lower bottom box side plates (14) are made of 20mm steel plates, and the lower bottom box connecting flange (15) is made of 60mm steel plates; The middle box (2) includes an up-and-down opening box structure composed of two middle box side plates (24), a middle box first outer side plate (23) and a middle box second outer side plate (210) between the two middle box side plates (24), and a middle box top plate (211) between one side of the middle box first outer side plate (23) and the middle box second outer side plate (210). The lower and upper openings of the up-and-down opening box structure are respectively provided with a middle box lower connecting flange (25) and a middle box upper connecting flange (26). The lower portions of the two middle box side plates (24) are respectively provided with an axle hole upper semicircular plate (21) and a first transmission ratio gear shaft hole upper semicircular plate (22). The upper portion of one of the middle box side plates (24) and the middle box top plate (211) are respectively provided with a motor mounting hole lower semicircular plate (27) and a second transmission ratio gear shaft hole lower semicircular plate (28). The axle hole upper semicircular plate (21) and the first transmission ratio gear shaft hole upper semicircular plate (22) are connected to the middle box lower connecting flange (25), and the motor mounting hole lower semicircular plate (27) and the second transmission ratio gear shaft hole lower semicircular plate (28) are connected to the middle box upper connecting flange (26). The axle hole upper semicircular plate (21), the first transmission ratio gear shaft hole upper semicircular plate (22), the motor mounting hole lower semicircular plate (27), and the second transmission ratio gear shaft hole lower semicircular plate (28) are made of 50mm steel plates. The middle box first outer side plate (23), the middle box side plate (24), the middle box second outer side plate (210), and the middle box top plate (211) are made of 30mm steel plates. The middle box lower connecting flange (25) and the middle box upper connecting flange (26) are made of 60mm steel plates. The upper cover box (3) includes a lower opening box structure composed of two upper cover box side plates (32) and an upper cover box top plate (33) between the two upper cover box side plates (32). The lower opening of the lower opening box structure is provided with an upper cover box connecting flange (36). The lower portions of the two upper cover box side plates (32) are respectively provided with a motor mounting hole upper semicircular plate (37) and a second transmission ratio gear shaft hole upper semicircular plate (38). The motor mounting hole upper semicircular plate (37) and the second transmission ratio gear shaft hole upper semicircular plate (38) are connected to the upper cover box connecting flange (36). The upper cover box side plate (32) and the upper cover box top plate (33) are made of 20mm steel plates. The upper cover box connecting flange (36) is made of 60mm steel plates. The motor mounting hole upper semicircular plate (37) and the second transmission ratio gear shaft hole upper semicircular plate (38) are made of 50mm steel plates. The axle hole lower semicircular plate (11) and the axle hole upper semicircular plate (21) constitute the axle mounting hole (A), the first transmission ratio gear shaft hole lower semicircular plate (12) and the first transmission ratio gear shaft hole upper semicircular plate (22) constitute the first transmission ratio gear shaft hole (B), the second transmission ratio gear shaft hole lower semicircular plate (28) and the second transmission ratio gear shaft hole upper semicircular plate (38) constitute the second transmission ratio gear shaft hole (C), and the motor mounting hole lower semicircular plate (27) and the motor mounting hole upper semicircular plate (37) constitute the disc type axial flux motor mounting hole (D).

2. A disc type axial flux electric vehicle axle gear box according to claim 1, characterized in that: The included angle between the center lines of the axle mounting hole (A) and the first transmission ratio gear shaft hole (B) and the center lines of the second transmission ratio gear shaft hole (C) and the disc type axial flux motor mounting hole (D) is 25°.

3. A disc type axial flux electric vehicle axle gear box according to claim 2, characterized in that: The center lines of the axle mounting hole (A) and the first transmission ratio gear shaft hole (B) form a 10° angle with the bottom surface of the lower bottom box body (1).

4. A disc type axial flux electric vehicle axle gear box according to any one of claims 1 to 3, characterized in that: The lower bottom box body bottom plate (13) is provided with a lubricating device mounting plate (16) and a plurality of oil drain holes (18), and the lubricating device mounting plate (16) is provided with a lubricating device mounting hole (17); the lower bottom box body side plate (14) of the lower bottom box body (1) is provided with an oiling device mounting hole (6), and the outer side of the oiling device mounting hole (6) is provided with an oiling device mounting flange (61); the pull rod arm (4) is arranged outside the axle hole upper semicircular plate (21); the upper cover box body (3) is provided with an inspection hole (34), and the outer side of the inspection hole (34) is provided with an inspection hole flange (341).

5. A disc type axial flux electric vehicle axle gear box according to claim 4, characterized in that: The motor mounting hole lower semicircular plate (27) and the second transmission ratio gear shaft hole lower semicircular plate (28) are an integral structure, constituting a lower semicircular hole connecting portion (29) of the middle box body; the motor mounting hole upper semicircular plate (37) and the second transmission ratio gear shaft hole upper semicircular plate (38) are an integral structure, constituting an upper semicircular hole connecting portion (39) of the upper cover box body; the lower semicircular hole connecting portion (29) of the middle box body and the upper semicircular hole connecting portion (39) of the upper cover box body are provided with mounting holes at the middle portions corresponding to each other and are detachably connected through fasteners.

6. The disc-type axial flux motor axle gearbox according to claim 5, characterized in that: A plurality of rib plates (5) are arranged between the axle hole lower semicircular plate (11) and the first transmission ratio gear shaft hole lower semicircular plate (12) and the lower bottom box body side plate (14), between the axle hole upper semicircular plate (21) and the first transmission ratio gear shaft hole upper semicircular plate (22) and the middle box body side plate (24), and between the lower semicircular hole connecting portion (29) of the middle box body and the middle box body top plate (211) on the same side.

7. A disc type axial flux electric vehicle axle gear box according to claim 6, characterized in that: The widths of the axle hole lower semicircular plate (11) and the axle hole upper semicircular plate (21) on one side of the lower bottom box body (1) and the middle box body (2) are greater than those on the other side.

8. The method of claim 7, wherein the method further comprises: forming the axle gear case body by machining the axle gear case body from a single piece of material. Firstly, the lower bottom box body (1), the middle box body (2) and the upper cover box body (3) are welded, then stress is eliminated and heat treatment is carried out, and finally mechanical machining is carried out, the specific steps are as follows: S1, welding preparation: S1.1, welding equipment: HT400D or HT500D digital control inverter type manual welding arc welding and argon arc welding combined with DC welding machine, Φ3.2mm and φ4.0mm E5015 welding rod; welding material: structural steel welding rod, carbon arc gas planer ZX5-630 welding machine combined with plasma gas planer LGK-100MA S1.2, heating device: H01-20 baking gun; S1.3, auxiliary facilities: angle grinder, file, hammer, spatula, mask, template, temperature meter, magnifying glass, heat preservation cotton; S1.4, welding material: the body is 16Mn low alloy steel; S1.5, welding requirements before welding: the welding surface is processed and cleaned by manual angle grinder to remove rust, grease and moisture, and the thick plate needs to be preheated to 150 degrees; S1.6, welding position: K groove; S1.7, welding requirements: all welding layers must be free of any welding defects and be fused to the base material; S1.8, welding process parameters: according to the welding equipment, welding material, welding material quality and welding requirements to develop welding parameters; when welding the backing layer, the welding rod is E5015 welding rod with a diameter of 3.2mm, the welding current is 90~120A, the arc voltage is 23±1V, and the welding speed is 15±1cm / min; when welding the filling layer and the surface layer, the welding rod is E5015 welding rod with a diameter of 4.0mm, the welding current is 130~160A, the arc voltage is 26±1V, and the welding speed is 17±1cm / min; S2, welding production: S2.1, first according to the design shape and size of the mechanical processing constitutes the lower bottom box (1) all axle hole lower half round plate (11), the first transmission ratio gear shaft hole lower half round plate (12), the lower bottom box bottom plate (13), the lower bottom box side plate (14), the lower bottom box connecting flange (15), the lubricating device mounting plate (16) and the rib plate (5), lubricating device mounting hole (17) is set up on the lubricating device mounting plate (16), oiling device mounting hole (6) is set up on the lower bottom box side plate (14), 30° bevel is respectively mechanically processed on each side of each lower bottom box side plate (14) double-sided, so that all the connecting parts can form K bevel double-sided welding when assembling; then according to the structure of the lower bottom box (1), the prepared plates are welded and assembled, the axle hole lower half round plate (11) and the first transmission ratio gear shaft hole lower half round plate (12) are used as positioning reference, the lower bottom box side plate (14) is fixed by spot welding below the axle hole lower half round plate (11) and the first transmission ratio gear shaft hole lower half round plate (12), the lower bottom box bottom plate (13) and the lubricating device mounting plate (16) are installed at the bottom of the lower bottom box side plate (14) and fixed by spot welding to form a basic frame, then the lower bottom box side plate (14) between the existing lower bottom box side plate (14) is fixed by spot welding after the basic frame is corrected according to the size of the lower bottom box (1), finally the lower bottom box connecting flange (15) and the rib plate (5) are fixed by precision assembling and spot welding; after the overall structure frame is fixed by spot welding according to the design size, welding is carried out; during welding, all the outside spot welding connection parts of the lower bottom box (1) are welded first, the welding method is manual electrode arc welding, and symmetrical welding is adopted on the outer two sides, because the axle hole lower half round plate (11), the first transmission ratio gear shaft hole lower half round plate (12) and the lower bottom box connecting flange (15) are relatively thick, the two sides of the bevel of the connection part are preheated to about 150 DEG C before welding, after the temperature reaches, the digital control inverter type manual electrode arc welding and argon arc welding are combined to use a direct current welding machine, and a diameter of 3.2mm E5015 structural steel electrode is selected to carry out symmetrical single-sided full-position welding, the current is 120A, the electrode is moved in a straight line, the weld also ensures good fusion with the two sides while penetrating the bottom, after the bottom layer welding, the surface is confirmed to be free of any welding defects by using ultrasonic stress relief, then the interlayer temperature is controlled, and then the filling and cover layer overall welding is carried out, a diameter of 4.0mm E5015 structural steel electrode, filling and cover layer welding current between 130-140A, especially the first layer of filling layer current is larger, to facilitate the elimination of the underlying defects, electrode using triangular operation, the electrode angle according to the change of the position of the overlay, filling layer is welded after the completion of the use of ultrasonic stress relief, visual or 10 times magnifying glass to confirm that there is no any welding defects on the surface, then the welding of the surface of the cover layer, cover layer must meet the design of the welding angle size and the two sides can not produce bite edge, after all the welding is completed by ultrasonic stress relief, then the whole is covered with insulation cotton all outside weld; then the welding of the lower bottom box (1) all inside point welding fixed connection, before welding using carbon arc gas ZX5-630 planer LGK-100MA welding machine with plasma gas planer LGK-100MA inside point welding fixed connection of the root, to confirm that there is no any defects before welding, welding inside when the welding method and process and welding size are equivalent to the welding of the outside connection, after all the welding is completed by ultrasonic stress relief, the whole is covered with insulation cotton weld cooling to room temperature, then the manual angle grinder for surface cleaning, finally all the welds are detected. S2.2, first according to the design shape and size of the mechanical processing constitutes the middle box (2) all axle hole upper semicircular plate (21), the first transmission ratio gear shaft hole upper semicircular plate (22), the middle box first outer side plate (23), the middle box side plate (24), the middle box lower connecting flange (25), the middle box upper connecting flange (26), the motor mounting hole lower semicircular plate (27) and the second transmission ratio gear shaft hole lower semicircular plate (28) constitute the middle box lower semicircular hole connecting part (29), the middle box second outer side plate (210), the middle box top plate (211), the rib plate (5) and the pull rod arm (4); In each middle box first outer side plate (23), middle box side plate (24), middle box second outer side plate (210), middle box top plate (211) each side double-sided mechanical processing single side 30° groove, so that all the connecting parts can form K groove double-sided welding when assembling; Then according to the structure of the middle box (2), weld and assemble the processed parts, take the axle hole upper semicircular plate (21), the first transmission ratio gear shaft hole upper semicircular plate (22) and the second transmission ratio gear shaft hole lower semicircular plate (28) and the middle box lower semicircular hole connecting part (29) constituting the middle box second outer side plate (210) as the positioning reference, spot weld and fix each middle box side plate (24) at the middle part of each semicircular plate and upper semicircular plate to form a basic frame and correct it to meet the design size, then spot weld and fix the middle box first outer side plate (23), the middle box second outer side plate (210) and the middle box top plate (211) between them, then spot weld and fix the pull rod arm (4), finally, spot weld and fix the middle box lower connecting flange (25), the middle box upper connecting flange (26) and each rib plate (5) with high precision; After the overall structure frame is spot welded and fixed according to the design size, weld; When welding, first weld all the outer spot welded and fixed connecting parts of the middle box (2), the welding method is manual electrode arc welding, and the welding is symmetrical on the outer two sides. Because the axle hole upper semicircular plate (21), the first transmission ratio gear shaft hole upper semicircular plate (22), the middle box lower connecting flange (25), the middle box upper connecting flange (26), the motor mounting hole lower semicircular plate (27) and the second transmission ratio gear shaft hole lower semicircular plate (28) constitute the middle box lower semicircular hole connecting part (29) and the pull rod arm (4), the plate material is relatively thick, the groove on both sides of the connecting part is preheated to about 150℃ before welding, after the temperature reaches, the digital control inverter type manual electrode arc welding and argon arc welding are combined to use a direct current welding machine, and an E5015 structural steel electrode with a diameter of 3.2mm is selected to perform symmetrical single-sided all-position welding, the current is 120A, and the electrode moving method is straight line moving. While melting through the bottom, the weld also needs to ensure good fusion with the two sides. After the bottom layer is welded, the surface is confirmed to be free of any welding defects by using ultrasonic stress relief, the interlayer temperature is controlled, and then the overall welding of the filling and cover layers is performed. A diameter of 4.0mm E5015 structural steel electrode, filling and cover layer welding current between 130-140A, especially the first layer of filling layer current is larger, to facilitate the elimination of the underlying defects, electrode using triangular operation, the electrode angle according to the change of the position of the overlay, filling layer after welding, using ultrasonic stress relief, visual or 10 times magnifying glass to confirm that there is no any welding defects on the surface, then the surface of the welding of the cover layer, cover layer must meet the design of the welding angle size and can not produce bite between the two sides, after all the welding through ultrasonic stress relief, then using the whole body of the outer side of the weld with insulation cotton covered; then the welding of the middle box (2) all inside the mouth spot welding fixed connection, before welding using carbon arc gas ZX5-630 planer LGK-100MA welding machine with plasma gas planer LGK-100MA inside the mouth spot welding fixed connection of the root, to confirm that there is no any defects before welding, welding inside the mouth when the welding method and process and welding size are equal to the outside connection of the welding, after all the welding ultrasonic stress relief, using the whole body of the weld with insulation cotton covered to room temperature, then the manual angle grinder for surface cleaning, finally all the welds for detection of defects. S2.3, first according to the design shape and size of the mechanical processing constitutes the upper cover box (3) all the upper cover box side plate (32), the upper cover box top plate (33), the upper cover box connecting flange (36), the motor mounting hole upper semicircular plate (37), the second transmission ratio tooth shaft hole upper semicircular plate (38) constitute the upper cover box upper semicircular hole connecting part (39), the inspection hole (34) is set on the upper cover box top plate (33), the double-sided mechanical processing of single side 30° groove is carried out on each side of each upper cover box side plate (32) and the upper cover box top plate (33), so that all the connecting parts can form K groove double-sided welding when assembling; then according to the upper cover box (3) welding assembly of each plate, the motor mounting hole upper semicircular plate (37) and the second transmission ratio tooth shaft hole upper semicircular plate (38) of the upper cover box upper semicircular hole connecting part (39) are used as positioning reference, the upper cover box side plate (32) is spot welded and fixed at the upper part of each semicircular plate to form a basic frame and carry out size correction, then the upper cover box top plate (33) is spot welded and fixed, finally the upper cover box connecting flange (36) is precisely assembled and spot welded; after the overall structure frame is spot welded and fixed according to the design size, welding is carried out; when welding, first weld all the outside spot welded and fixed connecting parts of the upper cover box (3), the welding method is selected as manual electrode arc welding, and symmetrical welding is adopted on the outside, because the motor mounting hole upper semicircular plate (37), the second transmission ratio tooth shaft hole upper semicircular plate (38) and the upper cover box connecting flange (36) constitute the upper cover box upper semicircular hole connecting part (39), and the plate material is relatively thick, the groove on both sides of the connecting part is preheated to about 150 DEG C before welding, after the temperature reaches, the digital control inverter type manual electrode arc welding and argon arc welding are combined with direct current welding machine, and the E5015 structural steel electrode with a diameter of 3.2mm is selected to carry out symmetrical single-sided full position welding, the current is 120A, the electrode moving method is straight line moving method, the weld also ensures good fusion with both sides while penetrating the bottom, after the bottom welding, the surface is confirmed to be free of any welding defects by using ultrasonic stress relief, then the interlayer temperature is controlled, and then the filling and cover layer overall welding is carried out, the diameter of 4.0mm E5015 structural steel electrode, filling and cover layer welding current between 130-140A, especially the first layer of filling layer current is larger, to facilitate the elimination of the underlying defects, electrode using triangular operation, the electrode angle according to the change of the position of the overlay, filling layer after welding, using ultrasonic stress relief, visual or 10 times magnifying glass to confirm that there is no any welding defects on the surface, then the surface of the welding of the cover layer, cover layer must meet the design of the welding angle size and can not produce bite between the two sides, after all the welding through ultrasonic stress relief, then using the whole body of the outer side of the weld with insulation cotton covered; 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