Drive axle and vehicle

Abstract

The drive axle comprises a motor, a drive shaft, a speed reducer, a differential mechanism, a first hub assembly and a second hub assembly, the motor comprises a shell and an output shaft, the output shaft extends out of one side of the shell, the drive shaft is connected with the output shaft, the speed reducer is connected with the drive shaft, and the first hub assembly is connected with the differential mechanism. The second hub assembly is connected with the differential mechanism and is arranged opposite to the first hub assembly. According to the technical scheme, the driving force of the motor can be transmitted to the speed reducer from the output shaft extending out of one side of the shell of the motor, and the first hub assembly and the second hub assembly are controlled to rotate through the speed reducer at the same time. Compared with the prior art, the drive axle provided by the invention has the advantages that the driving force transmission path of the motor is shorter, fewer transmission structures are needed, the driving force transmission efficiency is higher, and the assembly cost of the drive axle is lower.

Description

Technical Field

[0001] The present invention relates to the technical field of drive axles, and in particular to a drive axle and a vehicle. Background Art

[0002] The drive axle is a device that can convert electrical energy into vehicle forward kinetic energy, which is mainly composed of a motor, a reducer, a differential and a wheel hub assembly. In the related art, the transmission method of the motor, reducer, differential and wheel hub assembly of the drive axle is complex, the transmission efficiency is low, and the assembly cost is high. Summary of the invention

[0003] The purpose of the present invention is to provide a drive axle and a vehicle, aiming to provide a drive axle structure with a simple structure, low cost and high transmission efficiency.

[0004] To achieve the purpose of the present invention, in a first aspect, the present invention provides a drive axle, comprising:

[0005] The motor comprises a housing and an output shaft, wherein the output shaft extends from one side of the housing;

[0006] A driving shaft connected to the output shaft;

[0007] A reducer connected to the drive shaft;

[0008] A differential connected to the speed reducer;

[0009] A first hub assembly connected to the differential; and

[0010] a second wheel hub assembly connected to the differential and disposed opposite to the first wheel hub assembly;

[0011] The driving force of the motor is transmitted to the first hub assembly and the second hub assembly through the output shaft, the drive shaft, the reducer, and the differential.

[0012] In a possible implementation, the drive shaft and the output shaft are coaxially arranged.

[0013] In a possible implementation, the drive axle includes a connecting sleeve, and the drive shaft extends into one end of the connecting sleeve and is connected to the connecting sleeve;

[0014] The output shaft extends into the connecting sleeve from the other end of the connecting sleeve and is connected to the connecting sleeve.

[0015] In a possible implementation, the inner wall surface of the connecting sleeve is provided with a first key groove and a second key groove;

[0016] The output shaft is provided with a first connecting key, and the first connecting key is arranged in the first keyway;

[0017] The driving shaft is provided with a second connecting key, and the second connecting key is arranged in the second keyway.

[0018] In a possible implementation, the reducer is disposed below the motor.

[0019] In a possible implementation, the reducer includes a first gear connected to the drive shaft.

[0020] In a possible implementation manner, a first tooth structure is provided on the surface of the driving shaft, and the first tooth structure is meshed with the first gear.

[0021] In a possible implementation, the reducer further includes:

[0022] a transmission shaft connected to the first gear;

[0023] A planetary gear assembly is connected to the transmission shaft, and the differential is connected to the planetary gear assembly.

[0024] In a possible implementation, the transmission shaft is arranged parallel to the driving shaft.

[0025] In a possible implementation, the first gear is provided with a gear hole, and the gear hole is provided with a third keyway;

[0026] The transmission shaft is provided with a third connecting key, and the third connecting key is inserted into the third key slot.

[0027] In a possible implementation, the planetary gear assembly includes a planet carrier, a second gear and a ring gear;

[0028] The gear ring is arranged on the housing and is arranged outside the planet carrier;

[0029] The planet carrier is connected to the differential;

[0030] The second gear is rotatably mounted on the planet carrier, and at least a portion of the second gear protrudes out of the planet carrier to mesh with the ring gear;

[0031] The transmission shaft passes through the planet carrier and is connected to a side of the second gear teeth facing away from the gear ring.

[0032] In a possible implementation manner, a second tooth-shaped structure is provided on the surface of the transmission shaft, and the second tooth-shaped structure is meshed with the second gear.

[0033] In a possible implementation, the differential is disposed below the motor and is coaxially arranged with the reducer.

[0034] In a possible implementation, the differential includes a differential housing, and the differential housing is fixedly connected to the planet carrier;

[0035] The first wheel hub assembly and the second wheel hub assembly are drivingly connected to the differential housing.

[0036] In a possible implementation manner, the differential housing and the planet carrier are formed integrally.

[0037] In a possible implementation, the differential further includes a first planetary gear and a second planetary gear, and the first planetary gear is connected to the differential housing;

[0038] The second planetary gear is connected to the differential housing and is arranged opposite to the first planetary gear.

[0039] In a possible implementation, the differential further includes a first side shaft gear and a first side shaft, wherein the first side shaft gear is meshed with the first planetary gear and the second planetary gear;

[0040] One end of the first half shaft is connected to the first half shaft gear, and the other end is connected to the first hub assembly.

[0041] In a possible implementation, the differential further includes a second side shaft gear and a second side shaft, wherein the second side shaft gear is meshed with the first planetary gear and the second planetary gear and is arranged opposite to the first side shaft gear;

[0042] A second half shaft, one end of the second half shaft is connected to the first half shaft gear, and the other end is connected to the second wheel hub assembly.

[0043] In a possible implementation, the transmission shaft is hollow;

[0044] The first half shaft is inserted into the transmission shaft.

[0045] In a possible implementation, the drive axle further includes a frame, and the motor, the reducer, the differential, the first hub assembly, and the second hub assembly are disposed on the frame.

[0046] In a possible implementation, the drive axle includes a connecting sleeve, and the drive shaft and the output shaft are connected via the connecting sleeve;

[0047] The frame body comprises a liquid inlet and a first hydraulic chamber which are connected to each other; the connecting sleeve is arranged in the first hydraulic chamber;

[0048] The drive axle further comprises a parking assembly, and the parking assembly is used to stop the output shaft from rotating.

[0049] In a possible implementation, the parking assembly includes:

[0050] A first slider is movably disposed in the first hydraulic chamber, and the first slider has a first position and a second position;

[0051] a first spring, one end of the first spring being connected to the first slider in a direction away from the liquid inlet, and the other end of the first spring being connected to the first hydraulic chamber, and the first spring being in a compressed state when the first slider is in the second position;

[0052] a first friction plate, wherein the first friction plate is connected to the connecting sleeve;

[0053] The second friction plate is connected to the first slider, and when the first slider is in the first position, the second friction plate is in contact with the first friction plate, and when the first slider is in the second position, the second friction plate is separated from the first friction plate.

[0054] In a possible implementation, the frame includes a first frame, a second frame, and an intermediate frame;

[0055] The motor and the first hub assembly are arranged on the first frame;

[0056] The second hub is disposed on the second frame;

[0057] The intermediate frame is arranged on a side of the second frame facing the first frame;

[0058] The transmission shaft, the planet carrier and the ring gear are arranged on the intermediate frame.

[0059] In a second aspect, the present application provides a vehicle, the vehicle comprising a drive axle, the drive axle comprising:

[0060] The motor comprises a housing and an output shaft, wherein the output shaft extends from one side of the housing;

[0061] A driving shaft connected to the output shaft;

[0062] A reducer connected to the drive shaft;

[0063] A differential connected to the speed reducer;

[0064] A first hub assembly connected to the differential; and

[0065] a second wheel hub assembly connected to the differential and disposed opposite to the first wheel hub assembly;

[0066] The driving force of the motor is transmitted to the first hub assembly and the second hub assembly through the output shaft, the drive shaft, the reducer, and the differential.

[0067] In the technical solution of the present invention, the driving force of the motor can be transmitted to the reducer from the output shaft extending from one side of the housing, and the first hub assembly and the second hub assembly can be rotated synchronously through the reducer. Compared with the related art, the drive axle provided by the present invention has a shorter driving force transmission path of the motor, fewer transmission structures are required, the driving force transmission efficiency is higher, and the assembly cost of the drive axle is lower. And because the first hub assembly and the second hub assembly of the drive axle are driven by the driving force from the same accelerator, the rotation synchronization rate of the first hub assembly and the second hub assembly is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0069] Figure 1 A cross-sectional view of an embodiment of a drive axle provided by the present invention;

[0070] Figure 2 for Figure 1 A cross-sectional view of the motor;

[0071] Figure 3 for Figure 1 The enlarged view of point A in the middle;

[0072] Figure 4 It is a schematic diagram of the assembly of the drive shaft, the output shaft and the connecting sleeve;

[0073] Figure 5 for Figure 1 Assembly diagram of the intermediate reducer and differential;

[0074] Figure 6 for Figure 1 Assembly diagram of the intermediate frame, the motor, the first hub assembly and the second hub assembly;

[0075] Figure 7 for Figure 1 The enlarged view of point B in the middle;

[0076] Figure 8 for Figure 1 A cross-sectional view of another embodiment of the first brake assembly.

[0077] Description of reference numerals:

[0078] 1000 drive axle;

[0079] 1 motor, 11 housing, 12 output shaft, 121 first connecting key, 13 rotor, 14 stator;

[0080] 2 driving shaft, 21 first toothed structure, 212 second connecting key;

[0081] 3 reducer, 31 first gear, 32 transmission shaft, 321 second toothed structure, 33 planetary gear assembly, 331 planet carrier, 3311 avoidance groove, 3312 mounting hole, 332 second gear, 333 gear shaft, 334 retaining ring, 335 gear ring;

[0082] 4 differential, 41 differential case, 42 first planetary gear, 43 second planetary gear, 44 first half-shaft gear, 45 second half-shaft gear, 46 first half-shaft, 461 first connecting groove, 47, second half-shaft, 471 second connecting groove;

[0083] 5 first wheel hub assembly, 51 first wheel axle, 52 first wheel hub;

[0084] 6 second wheel hub assembly, 61 second wheel axle, 62 second wheel hub;

[0085] 7 frame, 71 first frame, 72 second frame, 73 intermediate frame, 74 first hydraulic chamber, 75 second hydraulic chamber;

[0086] 8 connecting sleeve, 81 first keyway, 82 second keyway;

[0087] 9 parking assembly, 91 first slider, 92 first spring, 93 first friction plate, 94 second friction plate;

[0088] 10 first brake assembly, 101 third friction plate, 102 fourth friction plate, 103 second spring, 104 second slider, 105 first brake drum, 106 first brake shoe, 107 first wheel cylinder;

[0089] 110 second brake assembly;

[0090] 120 motor bearings;

[0091] 130 drive shaft bearing;

[0092] 140 Oil seal. DETAILED DESCRIPTION

[0093] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0094] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0095] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in the present invention includes any and all combinations of one or more of the related listed items.

[0096] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0097] In the related art, the motor of the drive axle is set as a hollow motor, the output shaft of the motor has a first end and a second end arranged oppositely, the first end and the second end extend out of the motor from the two ends of the motor housing respectively, the first end of the output shaft is provided with a first helical gear, the second end of the output shaft is provided with a second helical gear, the first helical gear is connected to a first reducer, and the second helical gear is connected to a second reducer. The first reducer is connected to the first hub assembly, and the second reducer is connected to the second hub assembly. A part of the driving force of the motor is transmitted to the first helical gear and the first reducer through the first end, and finally transmitted to the first hub assembly, and drives the tire connected to the first hub assembly to rotate. Another part of the driving force of the motor is transmitted to the second helical gear and the second reducer through the second end, and finally transmitted to the second hub assembly, and drives the tire connected to the second hub assembly to rotate. This connection method between the motor and the hub assembly has a complex structure and high manufacturing cost, and the rotation synchronization rate of the first hub assembly and the second hub assembly after molding cannot be guaranteed.

[0098] To solve the above problems, the present invention proposes a vehicle, which can be a car, a truck, a motorcycle, or a forklift, and the present invention does not limit this. The vehicle includes a body, wheels, and a drive axle, the wheels are rotatably connected to the body, the drive axle is accommodated in the body, and is drivingly connected to the wheels. The wheels include a first wheel and a second wheel, and the drive axle is drivingly connected to the first wheel and the second wheel to drive the first wheel and the second wheel to rotate, thereby driving the vehicle to move.

[0099] Please refer to Figure 1 and Figure 2 , Figure 1 is a cross-sectional view of an embodiment of a drive axle 1000, Figure 2 : is a cross-sectional view of the motor 1. The drive axle 1000 includes: a motor 1, a drive shaft 2, a reducer 3, a differential 4, a first hub assembly 5 and a second hub assembly 6. The motor 1 includes a housing 11 and an output shaft 12, the output shaft 12 extends from one side of the housing 11, the drive shaft 2 is connected to the output shaft 12, the reducer 3 is connected to the drive shaft 2, the differential 4 is connected to the reducer 3, the first hub assembly 5 is connected to the differential 4, the second hub assembly 6 is connected to the differential 4, and is arranged opposite to the first hub assembly 5. The first hub assembly 5 is connected to the first wheel, and the second hub assembly 6 is connected to the second wheel. Among them, the driving force of the motor 1 is transmitted to the first hub assembly 5 and the second hub assembly 6 through the output shaft 12, the drive shaft 2, the reducer 3, and the differential 4, and then transmitted to the first wheel by the first hub assembly 5, and transmitted to the second wheel by the second hub assembly 6, thereby driving the vehicle to move.

[0100] In the technical solution of the present invention, the driving force of the motor 1 can be transmitted to the reducer 3 from the output shaft 12 extending from one side of the housing 11 thereof, and the first hub assembly 5 and the second hub assembly 6 can be synchronously rotated through the reducer 3. Compared with the related art, the drive axle 1000 provided by the present invention has a shorter driving force transmission path of the motor 1, fewer transmission structures required, higher driving force transmission efficiency, and lower assembly cost of the drive axle 1000. And because the first hub assembly 5 and the second hub assembly 6 of the drive axle 1000 are driven by the driving force from the same accelerator, the rotation synchronization rate of the first hub assembly 5 and the second hub assembly 6 is higher.

[0101] The motor 1 is used to increase the driving force for the rotation of the first hub assembly 5 and the second hub assembly 6; in the present invention, the housing 11 of the motor 1 is formed with an installation cavity, and the motor also includes a stator 14 and a rotor 13. The stator 14 includes a coil and a stator 14 core. The stator 14 core is fixed on the cavity wall of the installation cavity, and the coil is wound on the stator 14 core. The coil is connected to the power supply and can generate a first magnetic field in the installation cavity after power is turned on. The rotor 13 is rotatably arranged in the installation cavity, and in order to ensure that the rotor 13 can rotate smoothly in the installation cavity, in one embodiment of the present invention, a motor bearing 120 is also provided in the installation cavity, and the rotor 13 is supported in the installation cavity by the motor bearing 120. The rotor 13 is made of a permanent magnet and can generate a second magnetic field that interacts with the first magnetic field. One end of the output shaft 12 is connected to the rotor 13, and the other end extends out of the installation cavity of the housing 11. When the motor 1 starts working, the coil is energized and generates a first magnetic field, which interacts with the second magnetic field of the rotor 13 to drive the rotor 13 and the output shaft 12 connected to the rotor 13 to rotate.

[0102] The drive shaft 2 is rotatably connected to the drive axle 1000 through the drive shaft bearing 130. One end of the drive shaft 2 is connected to the output shaft 12, and the other end is connected to the reducer 3. The power of the motor 1 can be transmitted to the reducer 3 through the drive shaft 2. The drive shaft 2 and the output shaft 12 can be arranged vertically or coaxially, and the present application does not limit this. In one embodiment of the present application, the drive shaft 2 and the output shaft 12 are coaxially arranged, so as to reduce the longitudinal space of the drive axle 1000, optimize the structure of the drive shaft 2 in the drive axle 1000, and improve the space utilization rate of the drive shaft 2 for the drive axle 1000.

[0103] There are many ways to connect the drive shaft 2 to the reducer 3. In one embodiment of the present invention, a gear may be provided on the surface of the drive shaft 2, and the drive shaft 2 is connected to the reducer 3 through the gear. In other embodiments of the present invention, a first tooth structure 21 may also be provided on the surface of the drive shaft 2. The first tooth structure 21 may be formed on the surface of the drive shaft 2 by machining or by casting, and the present invention does not limit this. The drive shaft 2 is connected to the reducer 3 through the first tooth structure 21. It can be understood that compared with the arrangement of gears on the surface of the drive shaft 2, the arrangement of the first tooth structure 21 occupies less space for the drive axle 1000 and has lower assembly costs, which is conducive to improving the assembly efficiency of the drive axle 1000, reducing the assembly cost of the drive axle 1000, and improving the power density of the drive axle 1000.

[0104] Please refer to Figure 3There may be a variety of ways to connect the drive shaft 2 and the output shaft 12. The drive shaft 2 may be connected to the output shaft 12 by welding, or may be connected to the output shaft 12 by a key, and the present invention does not limit this. In one embodiment of the present invention, the drive axle 1000 includes a connecting sleeve 8, the drive shaft 2 extends from one end of the connecting sleeve 8 and is connected to the connecting sleeve 8, and the output shaft 12 extends from the other end of the connecting sleeve 8 and is connected to the connecting sleeve 8. The provision of the connecting sleeve 8, on the one hand, can simplify the difficulty of assembling the output shaft 12 and the drive shaft 2. On the other hand, the connecting sleeve 8 can provide a limit for the connection between the output shaft 12 and the drive shaft 2, improve the coaxiality of the drive shaft 2 and the output shaft 12, and thereby improve the stability of the operation of the drive axle 1000.

[0105] Please refer to Figure 4 There are many ways to connect the drive shaft 2, the output shaft 12 and the connecting sleeve 8. The drive shaft 2 and the output shaft 12 can be welded in the connecting sleeve 8, or they can be keyed in the connecting sleeve 8. This application does not limit this. In one embodiment of the present application, the inner wall surface of the connecting sleeve 8 is provided with a first keyway 81 and a second keyway 82, and the output shaft 12 is provided with a first connecting key 121, which is arranged in the first keyway 81, and the output shaft 12 is connected to the connecting sleeve 8 through the first connecting key 121 and the first keyway 81. The drive shaft 2 is provided with a second connecting key 212, which is arranged in the second keyway 82, and the drive shaft 2 is connected to the connecting sleeve 8 through the second connecting key 212 and the second keyway 82. Compared with welding or other connection methods, the key connection structure of the drive shaft 2, the output shaft 12 and the connecting sleeve 8 is simpler, more convenient to disassemble and assemble, and convenient for subsequent installation and maintenance.

[0106] Please continue to refer to Figure 3 , Figure 3The figure is a connection diagram of the parking assembly 9 of the drive axle 1000. The drive axle 1000 also includes a parking assembly 9, which is used to stop the output shaft 12 from rotating. When the vehicle is in the parking state, the parking assembly 9 acts on the output shaft 12, thereby limiting the transmission of power from the motor 1 to keep the vehicle stationary. The parking assembly 9 can be arranged on the side of the output shaft 12 away from the drive shaft 2, or on the side of the output shaft 12 close to the drive shaft 2, and the present application does not limit this. In one embodiment of the present application, the parking assembly 9 is arranged on the side of the output shaft 12 close to the drive shaft 2, so as to release the space on the side of the output shaft 12 away from the drive shaft 2, optimize the spatial structure of the drive axle 1000, and improve the utilization rate of the parking assembly 9 for the space of the drive axle 1000. Specifically, the drive axle 1000 includes a first hydraulic chamber 74 and a liquid inlet connected to the first hydraulic chamber 74. The liquid inlet is used to connect to the hydraulic oil chamber of the vehicle. The hydraulic oil in the hydraulic oil chamber can enter the first hydraulic chamber 74 from the liquid inlet under the drive of the hydraulic system of the vehicle. The parking assembly 9 includes a first slider 91, a first spring 92, a first friction plate 93 and a second friction plate 94. The first slider 91 is movably arranged in the first hydraulic chamber 74. The first slider 91 has a first position and a second position. One end of the first spring 92 is connected to the first slider 91 away from the liquid inlet direction, and the other end is connected to the first hydraulic chamber 74. When the first slider 91 is in the second position, the first spring 92 is in a compressed state. The first friction plate 93 is connected to the connecting sleeve 8. There are many ways to connect the first friction plate 93 to the connecting sleeve 8. The first friction plate 93 can be welded to the connecting sleeve 8 or connected to the connecting sleeve 8 by a key. The present invention does not limit this. The material of the first friction plate 93 can be metal, ceramic, or rubber. The present invention does not limit this. The second friction plate 94 is connected to the first slider 91. The second friction plate 94 and the first slider 91 can be connected by welding or key connection, and the present invention does not limit this. The material of the second friction plate 94 can be steel, iron, or other wear-resistant metals, and the present invention does not limit this. When the first slider 91 is in the first position, the second friction plate 94 contacts the first friction plate 93, and when the first slider 91 is in the second position, the second friction plate 94 is separated from the first friction plate 93.

[0107] In specific practice, when the vehicle is in the parking state, the first slider 91 is in the first position, and the second friction plate 94 of the first slider 91 is in contact with the first friction plate 93 of the connecting sleeve 8. At this time, the friction force between the first friction plate 93 and the second friction plate 94 is greater than the driving force of the motor 1 output shaft 12 to rotate, and the driving force of the output shaft 12 cannot be transmitted to the drive shaft 2 through the connecting sleeve 8, and the vehicle remains stationary. When the vehicle is released from the parking state, the hydraulic system of the vehicle works, and then drives the hydraulic oil from the liquid inlet into the first hydraulic chamber 74. The first slider 91 moves to the second position under the push of the hydraulic oil and compresses the first spring 92. In the second position, the second friction plate 94 provided on the first slider 91 is separated from the first friction plate 93 provided on the connecting sleeve 8, and the connecting sleeve 8 is released. The driving force of the output shaft 12 can be transmitted to the drive shaft 2 through the connecting sleeve 8, and then transmitted to the first hub assembly 5 and the second hub assembly 6 through the drive shaft 2, so that the vehicle can start to move. When the vehicle is switched back to the parking state, the hydraulic oil flows out of the first hydraulic chamber 74 from the liquid inlet under the drive of the hydraulic system, and the first spring 92 is released. The first slider 91 returns to the first position under the push of the first spring 92. In the first position, the second friction plate 94 of the first slider 91 contacts the first friction plate 93 of the connecting sleeve 8, and the vehicle re-enters the stationary state.

[0108] In order to prevent the hydraulic oil in the first hydraulic chamber 74 from entering the installation chamber of the motor 1, in the present embodiment, an oil seal 140 is further provided at the junction of the installation chamber and the first hydraulic chamber 74. The oil seal 140 is used to seal the first hydraulic chamber 74 to prevent the hydraulic oil in the first hydraulic chamber 74 from entering the installation chamber from the junction of the installation chamber and the first hydraulic chamber 74, thereby affecting the normal operation of the motor 1.

[0109] It can be understood that in other embodiments of the present invention, the parking assembly 9 can also adopt other forms. For example, a brake can be set on the outside of the connecting sleeve 8. When the vehicle is switched to the parking state, the brake holds the connecting sleeve 8 and limits the movement of the connecting sleeve 8, which can also achieve the purpose of parking.

[0110] Please combine Figure 1 refer to Figure 5 , Figure 5 Schematic diagram of assembly of reducer 3 and differential 4. Differential 4 is used to eliminate the speed difference between first hub assembly 5 and second hub assembly 6, so as to ensure that when the vehicle is turning or driving on uneven roads, the first wheel and the second wheel connected to the first hub assembly and the second hub assembly 6 can rotate at different speeds, thereby ensuring the stability of vehicle operation. In one embodiment of the present application, differential 4 is arranged below motor 1 and coaxially with reducer 3, so as to reduce the longitudinal volume of drive axle 1000 and improve the space utilization rate of differential 4 for drive axle 1000.

[0111] The differential 4 includes a differential case 41, a first planetary gear 42, a second planetary gear 43, a first half-shaft gear 44, a second half-shaft gear 45, a first half-shaft 46 and a second half-shaft 47. The differential case 41 is drivingly connected to the reducer 3. The first planetary gear 42 is connected to the differential case 41; the second planetary gear 43 is connected to the differential case 41 and is arranged opposite to the first planetary gear 42; the first half-shaft gear 44 is meshed with the first planetary gear 42 and the second planetary gear 43; the second half-shaft gear 45 is meshed with the first planetary gear 42 and the second planetary gear 43 and is arranged opposite to the first half-shaft gear 44. One end of the first half-shaft 46 is connected to the first half-shaft gear 44, and the other end is connected to the first wheel hub assembly 5; one end of the second half-shaft 47 is connected to the second half-shaft gear 45, and the other end is connected to the second wheel hub assembly 6. The power of the motor can be transmitted from the reducer to the differential case 41, and then drive the first planetary gear 42 and the second planetary gear 43 to rotate through the differential case 41, drive the first half-shaft gear 44 and the second half-shaft gear 45 to rotate, and then drive the first half-shaft 46 and the second half-shaft 47 to rotate, and finally drive the first hub assembly 5 and the second hub assembly 6 to rotate.

[0112] In one embodiment of the present invention, the transmission shaft 32 is hollow, the first half shaft 46 is passed through the transmission shaft 32, and is connected to the first hub assembly 5, so that the first half shaft 46 can be overlapped in the transmission shaft 32, thereby optimizing and reducing the occupation of the internal space of the drive axle 1000 by the first half shaft 46, optimizing the space of the drive axle 1000, reducing the volume of the drive axle 1000, and increasing the power area of ​​the drive axle 1000.

[0113] The reducer 3 is used to adjust the torque of the motor 1 acting on the differential 4, thereby adjusting the rotation speed of the wheel. The reducer 3 is arranged below the motor 1 and is placed parallel to the motor 1, so as to optimize the structure of the drive axle 1000 and improve the utilization rate of the reducer 3 and the motor 1 for the internal space of the drive axle 1000. The reducer includes a first gear 31, a transmission shaft 32 and a planetary gear assembly 33. The first gear 31 is connected to the drive shaft 2 by transmission, and the transmission shaft 32 is connected to the first gear 31 by transmission. The transmission shaft 32 and the first gear 31 can be connected by welding or by key, and the present application does not limit this. In one embodiment of the present application, the first gear 31 is provided with a gear hole, the gear hole is provided with a third keyway, the transmission shaft 32 is provided with a third connection key, the third connection key is inserted in the third keyway, and the transmission shaft 32 is connected to the first gear 31 by transmission through the third connection key and the third keyway. Compared with welding or other connection methods, the key connection method of the transmission shaft 32 and the first gear 31 is simpler in structure, more convenient for disassembly and assembly, and convenient for installation and subsequent maintenance. In one possible implementation mode of the present application, the transmission shaft 32 is arranged in parallel with the drive shaft 2 , so as to reduce the longitudinal volume of the drive axle 1000 , optimize the structure of the drive axle 1000 , and improve the space utilization rate of the transmission shaft 32 for the drive axle 1000 .

[0114] The tooth surface of the first gear 31 meshes with the first tooth structure 21 of the drive shaft 2, and the end face of the first gear 31 is connected to the transmission shaft 32. The setting of the first gear 31, on the one hand, can drive the shaft 2 and the transmission shaft 32, so that the driving force of the motor 1 can be transmitted from the drive shaft 2 to the transmission shaft 32. On the other hand, the first gear 31 can change the transmission direction of the driving force and optimize the spatial structure of the reducer 3 in the drive bridge 1000. Imagine that if the first gear 31 does not exist, the transmission shaft 32 can only be connected to the drive shaft 2 along the axial direction of the drive shaft 2. This connection method will undoubtedly increase the axial length of the drive bridge 1000. After the transition through the first gear 31, the transmission shaft 32 can be connected to the drive shaft 2 in a direction parallel to the drive shaft 2. In this way, the structural layout of the reducer 3 can be effectively optimized and the axial length of the drive bridge 1000 can be shortened.

[0115] The transmission shaft 32 is connected to the planetary wheel assembly 33 by transmission. The driving force of the motor 1 can be transmitted from the first gear 31 to the transmission shaft 32, the planetary wheel assembly 33, and the differential 4, and finally to the first hub assembly 5 and the second hub assembly 6, thereby driving the vehicle to move. There are many transmission modes between the transmission shaft 32 and the planetary wheel assembly 33. In one embodiment of the present invention, the surface of the transmission shaft 32 can be provided with a gear, and the transmission shaft 32 is connected to the planetary wheel assembly 33 through the gear. In other embodiments of the present invention, the surface of the transmission shaft 32 can also be provided with a second toothed structure 321, and the second toothed structure 321 can be formed on the surface of the transmission shaft 32 by machining, or can be formed on the surface of the transmission shaft 32 by casting, and the present invention does not limit this. The transmission shaft 32 is connected to the planetary wheel assembly 33 by transmission through the second toothed structure 321, so that the driving force of the motor 1 can be transmitted from the transmission shaft 32 to the planetary wheel assembly 33, thereby driving the vehicle to move. It can be understood that, compared with setting a gear sleeve on the surface of the transmission shaft 32, the setting of the second tooth structure 321 occupies less space of the drive axle 1000, has lower setting cost, and is more conducive to improving the assembly efficiency of the drive axle 1000 and reducing the assembly cost of the drive axle 1000.

[0116] The planetary gear assembly 33 is used to adjust the driving force torque of the motor 1. The planetary gear assembly 33 is connected to the differential 4 to transmit the adjusted torque to the first hub assembly 5 and the second hub assembly 6, thereby driving the vehicle to move. The planetary gear assembly 33 includes: a planet carrier 331, a second gear 332 and a ring gear 335. The planet carrier 331 is connected to the differential housing 41. The second gear 332 is arranged in the mounting hole 3312 of the planet carrier 331 through a retaining ring 334 and a gear shaft 333. The number of the second gears 332 can be set to two or three. For example, in the present invention, the number of the second gears 332 is set to four and arranged along the axial direction of the planet carrier 331. The transmission shaft 32 is clamped between the four second gears 332, and the second toothed structure 321 of the transmission shaft 32 is meshed with the second gear 332. The driving force of the motor 1 can be transmitted to the second gear 332 through the transmission shaft 32. The planet carrier 331 is axially provided with a plurality of avoidance grooves 3311, and the second gear 332 extends out of the planet carrier 331 through the avoidance grooves and meshes with the ring gear 335. The ring gear 335 is fixed in the drive axle 1000, and the second gear 332 can perform planetary motion along the ring gear 335, and drive the planet carrier 331 and the differential 4 connected to the planet carrier 331 to rotate, and then drive the first hub assembly 5 and the second hub assembly 6 connected to the differential 4 to rotate. In one embodiment of the present application, the planet carrier 331 is integrally formed with the differential housing 41, so as to reduce the manufacturing cost of the drive axle 1000, improve the connection reliability of the differential 4 and the reducer 3, and improve the reliability of the drive axle 1000.

[0117] Please combine Figure 1refer to Figure 6 The drive axle 1000 further includes a frame 7, which includes a first frame 71 and a second frame 72. The first hub assembly 5 is disposed on the first frame 71, the second hub assembly 6 is disposed on the second frame 72, and the motor 1 is disposed on the first frame 71 through the motor 1 bolts. The first hydraulic chamber 74 and the liquid inlet are formed in the first frame 71, and the drive shaft 2 is rotatably disposed on the first frame 71.

[0118] In one embodiment of the present invention, the frame 7 further includes an intermediate frame 73, which is arranged on the side of the second frame 72 facing the first frame 71 and connected to the second frame 72 by pins. The setting of the intermediate frame 73, on the one hand, can divide the manufacture of the frame 7 into three parts, thereby reducing the casting difficulty of the frame and reducing the manufacturing cost of the frame. On the other hand, the transmission shaft 32 is fixed to the intermediate frame 73 through the transmission shaft bearing, the planetary carrier 331 is fixed to the intermediate frame 73 through the planetary carrier bearing, and the ring gear 335 is arranged on the intermediate frame 73. By adjusting the position of the intermediate frame 73 and the second frame 72, the relative position of the transmission shaft 32, the planetary carrier 331, the ring gear 335 and the first hub assembly 5 and the second hub assembly 6 can be adjusted, thereby improving the coaxiality of the transmission shaft 32, the planetary carrier 331, the ring gear 335 and the first hub assembly 5 and the second hub assembly 6, improving the assembly accuracy of the drive axle 1000, and thereby improving the running stability of the drive axle 1000.

[0119] Please refer to Figure 1 The first wheel hub assembly 5 includes a first wheel axle 51 and a first wheel hub 52. The first wheel hub 52 is rotatably connected to the frame body 7. One end of the first wheel axle 51 is connected to the first wheel hub 52, and the other end is connected to the first half shaft 46. The first wheel hub 52 is connected to the first wheel. The driving force of the motor 1 can be transmitted to the first half shaft 46 through the planetary carrier 331, transmitted to the first wheel axle 51 through the first half shaft 46, transmitted to the first wheel axle 51 through the first wheel axle 51 to the first wheel hub 52, and transmitted to the first wheel through the first wheel hub 52, thereby driving the first wheel to rotate. There are many ways to connect the first semi-shaft 46 and the first axle 51. The first semi-shaft 46 can be connected to the first axle 51 by welding or by a sleeve, and the present invention does not limit this. In one embodiment of the present invention, a first connecting groove is formed on the side of the first semi-shaft 46 away from the planet carrier 331, and the first axle 51 extends into the first connecting groove 461 to connect with the first semi-shaft 46, so as to increase the contact area between the first semi-shaft 46 and the first axle 51 and improve the stability of the connection between the first semi-shaft 46 and the first axle 51. The first axle 51 and the first connecting groove 461 can be connected by welding or by a key, and the present application does not limit this.

[0120] The second wheel hub assembly 6 includes a second wheel axle 61 and a second wheel hub 62. The second wheel hub 62 is rotatably connected to the frame body 7. One end of the second wheel axle 61 is connected to the second wheel hub 62, and the other end is connected to the second semi-axle 47. The driving force of the motor 1 can be transmitted to the second semi-axle 47 through the planetary frame 331, transmitted to the second wheel axle 61 through the second semi-axle 47, transmitted to the second wheel axle 61 through the second wheel axle 61, transmitted to the second wheel hub 62, and transmitted to the second wheel hub 62, thereby driving the second wheel to rotate. A second connecting groove is formed on the side of the second semi-axle 47 away from the planetary frame 331. The second wheel axle 61 extends into the second connecting groove 471 to connect with the second semi-axle 47, increase the contact area between the second semi-axle 47 and the second wheel axle 61, and improve the stability of the connection between the second semi-axle 47 and the second wheel axle 61. The second wheel axle 61 and the second connecting groove 471 can be connected by welding or by a key, and the present application does not limit this.

[0121] Please refer to Figure 7 The drive axle 1000 further includes a first brake assembly 10 and a second brake assembly 110 . The first brake assembly 10 is used to stop the first wheel hub 52 from rotating, and the second brake assembly 110 is used to stop the second wheel hub 62 from rotating.

[0122] Specifically, in one embodiment of the present invention, the frame 7 is formed with a second hydraulic chamber 75 and a third hydraulic chamber connected to the liquid inlet hole, the first brake assembly 10 includes: a third friction plate 101, a fourth friction plate 102, a second spring 103 and a second slider 104, the first half shaft 46 and the first wheel shaft 51 are connected in the second hydraulic chamber 75, the third friction plate 101 is arranged on the first half shaft 46, the third friction plate 101 can be arranged on the first half shaft 46 by welding, and can also be arranged on the first half shaft 46 by key connection, and the present invention does not limit this. The fourth friction plate 102 is arranged on the cavity wall of the second hydraulic chamber 75, and a second spring 103 is arranged between the third friction plate 101 and the fourth friction plate 102. In specific practice, when the motor 1 stops delivering driving force to the first hub assembly 5, the hydraulic system of the vehicle works and drives the hydraulic oil to enter the second hydraulic chamber 75 from the liquid inlet. The hydraulic oil pushes the second slider 104 to move forward and pushes the fourth friction plate 102 to overcome the elastic force of the second spring 103 and move toward the third friction plate 101. The fourth friction plate 102 contacts the third friction plate 101. During the contact between the fourth friction plate 102 and the third friction plate 101, the kinetic energy of the first hub 52 is converted into the thermal energy of the fourth friction plate 102 and the third friction plate 101, and the first hub 52 stops quickly. When the first hub 52 stops rotating, the hydraulic oil exits the second hydraulic chamber 75, and the third friction plate 101 and the fourth friction plate 102 are separated again under the action of the second spring 103.

[0123] Similarly, the second brake assembly 110 includes: a fifth friction plate, a sixth friction plate, a third spring and a third slider. The second half shaft 47 and the first wheel shaft 51 are connected in the second hydraulic chamber 75. The fifth friction plate is arranged on the second half shaft 47. The fifth friction plate can be arranged on the second half shaft 47 by welding or by key connection. The present invention does not limit this. The sixth friction plate is arranged on the cavity wall of the second hydraulic chamber 75. A third spring is arranged between the fifth friction plate and the sixth friction plate. In specific practice, when the motor 1 stops delivering driving force to the second wheel hub assembly 6, the hydraulic system of the vehicle works and drives the hydraulic oil to enter the second hydraulic chamber 75 from the liquid inlet. The hydraulic oil pushes the second slider 104 to move forward and pushes the sixth friction plate to overcome the elastic force of the third spring and move closer to the fifth friction plate. The sixth friction plate contacts the fifth friction plate. During the contact between the sixth friction plate and the fifth friction plate, the kinetic energy of the second wheel hub 62 is converted into friction heat energy between the sixth friction plate and the fifth friction plate, and the second wheel hub 62 stops quickly. When the second wheel hub 62 stops rotating, the hydraulic oil exits the second hydraulic chamber 75, and the fifth friction plate and the sixth friction plate are separated again under the action of the third spring.

[0124] It is understandable that the first brake assembly 10 and the second brake assembly 110 may also be implemented in other ways. Figure 8 In other embodiments of the present invention, the first brake assembly 10 includes a first brake drum 105, a first brake shoe 106 and a first wheel cylinder 107. The first brake shoe 106 is movably mounted on the frame 7, and the first brake drum 105 is mounted on the first wheel hub 52 and can rotate with the first wheel hub 52. The first wheel cylinder 107 is used to drive the first brake drum 105 to approach the first brake shoe 106. In a specific application, when the first wheel needs to brake, the first brake shoe 106 can be driven by the first wheel cylinder 107 to move toward the first brake drum 105 and contact the rotating first brake drum 105, thereby converting the kinetic energy of the first brake drum 105 into friction heat energy between the first brake shoe 106 and the first brake drum 105, thereby quickly stopping the first wheel hub 52 connected to the first brake drum 105, thereby playing a braking role.

[0125] Similarly, the second brake assembly 110 includes a second brake drum, a second brake shoe, and a second wheel cylinder. The second brake shoe is movably mounted on the frame 7, and the second brake drum is mounted on the second wheel hub 62 and can rotate with the second wheel hub 62. The second wheel cylinder is used to drive the second brake drum to approach the second brake shoe. In a specific application, when the second wheel needs to brake, the second brake shoe can be driven by the second wheel cylinder to move toward the second brake drum and contact the rotating second brake drum, thereby converting the kinetic energy of the second brake drum into friction heat energy between the second brake shoe and the second brake drum, thereby quickly stopping the second wheel hub 62 connected to the second brake drum, thereby playing a braking role.

[0126] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0127] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A drive axle, It is characterized in that include: The motor comprises a housing and an output shaft, wherein the output shaft extends from one side of the housing; A driving shaft connected to the output shaft; A reducer connected to the drive shaft; A differential connected to the speed reducer; a first hub assembly connected to the differential; as well as a second wheel hub assembly connected to the differential and disposed opposite to the first wheel hub assembly; The driving force of the motor is transmitted to the first hub assembly and the second hub assembly through the output shaft, the drive shaft, the reducer, and the differential.

2. The drive axle according to claim 1, It is characterized in that The drive shaft is coaxially arranged with the output shaft.

3. The drive axle according to claim 2, It is characterized in that The drive axle comprises a connecting sleeve, and the drive shaft extends into one end of the connecting sleeve and is connected to the connecting sleeve; The output shaft extends into the connecting sleeve from the other end of the connecting sleeve and is connected to the connecting sleeve.

4. The drive axle according to claim 3, It is characterized in that The inner wall surface of the connecting sleeve is provided with a first keyway and a second keyway; The output shaft is provided with a first connecting key, and the first connecting key is arranged in the first keyway; The driving shaft is provided with a second connecting key, and the second connecting key is arranged in the second keyway.

5. The drive axle according to claim 1, It is characterized in that The reducer is arranged below the motor.

6. The drive axle according to claim 1, It is characterized in that The speed reducer includes a first gear connected to the driving shaft.

7. The drive axle according to claim 6, It is characterized in that A first tooth-shaped structure is provided on the surface of the driving shaft, and the first tooth-shaped structure is meshed with the first gear.

8. The drive axle according to claim 6, It is characterized in that The reducer also includes: a transmission shaft connected to the first gear; A planetary gear assembly is connected to the transmission shaft, and the differential is connected to the planetary gear assembly.

9. The drive axle according to claim 8, It is characterized in that The transmission shaft is arranged parallel to the driving shaft.

10. The drive axle according to claim 8, It is characterized in that The first gear is provided with a gear hole, and the gear hole is provided with a third keyway; The transmission shaft is provided with a third connecting key, and the third connecting key is inserted into the third key slot.

11. The drive axle according to claim 8, It is characterized in that The planetary gear assembly comprises a planet carrier, a second gear and a ring gear; The gear ring is arranged on the housing and is arranged outside the planet carrier; The planet carrier is connected to the differential; The second gear is rotatably mounted on the planet carrier, and at least a portion of the second gear protrudes out of the planet carrier to mesh with the ring gear; The transmission shaft passes through the planet carrier and is connected to a side of the second gear teeth facing away from the gear ring.

12. The drive axle according to claim 11, It is characterized in that A second tooth-shaped structure is provided on the surface of the transmission shaft, and the second tooth-shaped structure is meshed with the second gear.

13. The drive axle according to claim 11, It is characterized in that The differential is arranged below the motor and is coaxially arranged with the reducer.

14. The drive axle according to claim 13, It is characterized in that The differential comprises a differential housing, and the differential housing is fixedly connected to the planet carrier; The first wheel hub assembly and the second wheel hub assembly are drivingly connected to the differential housing.

15. The drive axle according to claim 14, It is characterized in that The differential housing and the planet carrier are integrally formed.

16. The drive axle according to claim 14, It is characterized in that The differential also includes a first planetary gear and a second planetary gear, wherein the first planetary gear is connected to the differential housing; The second planetary gear is connected to the differential housing and is arranged opposite to the first planetary gear.

17. The drive axle according to claim 16, It is characterized in that The differential also includes a first side shaft gear and a first side shaft, wherein the first side shaft gear is meshed with the first planetary gear and the second planetary gear; One end of the first half shaft is connected to the first half shaft gear, and the other end is connected to the first hub assembly.

18. The drive axle according to claim 17, It is characterized in that The differential further includes a second side shaft gear and a second side shaft, wherein the second side shaft gear is meshed with the first planetary gear and the second planetary gear and is arranged opposite to the first side shaft gear; A second half shaft, one end of the second half shaft is connected to the first half shaft gear, and the other end is connected to the second wheel hub assembly.

19. The drive axle according to claim 17, It is characterized in that The transmission shaft is hollow; The first half shaft is inserted into the transmission shaft.

20. The drive axle according to claim 11, It is characterized in that The drive axle further comprises a frame, and the motor, the reducer, the differential, the first hub assembly, and the second hub assembly are arranged on the frame.

21. The drive axle according to claim 20, It is characterized in that The drive axle comprises a connecting sleeve, and the drive shaft and the output shaft are connected via the connecting sleeve; The frame body comprises a liquid inlet and a first hydraulic chamber which are connected to each other, and the connecting sleeve is arranged in the first hydraulic chamber; The drive axle further comprises a parking assembly, and the parking assembly is used to stop the output shaft from rotating.

22. The drive axle according to claim 21, It is characterized in that The parking assembly comprises: A first slider is movably disposed in the first hydraulic chamber, and the first slider has a first position and a second position; a first spring, one end of the first spring being connected to the first slider in a direction away from the liquid inlet, and the other end of the first spring being connected to the first hydraulic chamber, and the first spring being in a compressed state when the first slider is in the second position; a first friction plate, wherein the first friction plate is connected to the connecting sleeve; The second friction plate is connected to the first slider, and when the first slider is in the first position, the second friction plate is in contact with the first friction plate, and when the first slider is in the second position, the second friction plate is separated from the first friction plate.

23. The drive axle according to claim 20, It is characterized in that The frame includes a first frame, a second frame and an intermediate frame; The motor and the first hub assembly are arranged on the first frame; The second hub is disposed on the second frame; The intermediate frame is arranged on a side of the second frame facing the first frame; The transmission shaft, the planet carrier and the ring gear are arranged on the intermediate frame.

24. A vehicle, It is characterized in that Comprising a drive axle as claimed in any one of claims 1 to 23.

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