Wet type electric drive axle of loading machine

Abstract

The invention relates to the technical field of engineering mechanical transmission systems, in particular to a wet type electric drive axle of a loading machine. The differential mechanism comprises a differential mechanism shell, a half shaft sleeve, a hub and a brake device. The half shaft penetrates through the half shaft sleeve, is connected to the hub and is used for driving the hub to rotate; lubricant and a brake device are arranged in the hub, the brake device is composed of a stop ring, a stop sleeve and a brake mechanism, and the locking function is achieved through abutting connection of an inner friction plate and an outer friction plate. The brake mechanism controls contact and separation of an inner friction plate and an outer friction plate through changes of a thrust sleeve and an expansion cavity, and efficient and reliable brake performance is ensured. In addition, the reset mechanism ensures the stability and reliability of the system through a reset spring. The technical effect of improving the braking reliability and maintenance convenience of the wet-type electric drive axle of the loading machine is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery transmission systems, and in particular to a wet electric drive axle for a loader. Background Art

[0002] At present, the common loader drive axles on the market mainly include traditional mechanical drive axles and emerging dry electric drive axles. Traditional mechanical drive axles are directly driven by the engine. Although they have a simple structure and are easy to maintain, they are gradually showing their shortcomings in modern construction scenarios due to their low transmission efficiency, high energy consumption, and high noise. In contrast, dry electric drive axles have attracted widespread attention due to their advantages such as high efficiency and rapid response. However, dry electric drive axles face electrical system stability and heat dissipation problems in harsh working environments. These problems seriously affect their application effects under heavy loads and complex road conditions.

[0003] In order to solve the heat dissipation problem of dry electric drive axle electrical components, most of them adopt forced air cooling or water cooling system; although these cooling methods can alleviate the heat dissipation problem to a certain extent, they increase the size and weight of the equipment, and long-term operation in a dusty environment will lead to a decrease in heat dissipation efficiency and may even cause short circuit failures. In addition, due to the lack of liquid medium isolation, the dry electric drive axle has high electromagnetic interference, which will interfere with the normal operation of the on-board electronic equipment.

[0004] Both the traditional mechanical drive axle and the existing dry electric drive axle have obvious limitations when dealing with harsh working conditions such as extreme load changes, high temperature and humidity. The dry electric drive axle faces serious heat dissipation problems and reliability challenges, especially under conditions of continuous high-intensity work. Its service life is greatly limited. In special environments, such as mines, its braking system is prone to sparks, affecting production safety. Therefore, a new technical solution is urgently needed to overcome these defects and improve the dynamic performance and reliability of the loader under various complex working conditions. Summary of the invention

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the present application provides a loader wet electric drive axle, which not only inherits the high efficiency and fast response characteristics of the dry electric drive axle, but also adopts wet cooling technology, effectively solving the heat dissipation problem in harsh environments, and significantly improving the stability and reliability of the entire drive axle.

[0006] This application is implemented through the following technical solutions: A wet electric drive axle for a loader comprises a differential case, wherein the differential case is provided with a half-shaft for providing a transmission torque to a wheel hub, half-shaft sleeves are installed on both sides of the differential case, and the wheel hub is rotatably connected to the half-shaft sleeve; the half-shaft passes through the half-shaft sleeve and is connected to the wheel hub for driving the wheel hub to rotate on the sleeve; the wheel hub is a cavity structure, a lubricant is provided in the cavity of the wheel hub, and a brake device for limiting the rotation of the half-shaft is also provided in the cavity of the wheel hub; the brake device comprises a stop ring, a stop sleeve and a brake mechanism; the stop ring key is connected to the half-shaft, and the outer wall key of the stop ring is connected to the outer friction plate; the stop sleeve key is connected to the half-shaft sleeve, and the inner wall key of the stop sleeve is connected to the inner friction plate; the brake mechanism is used to drive the inner friction plate to abut against the outer friction plate to perform a locking action; the half-shaft sleeve is provided with a reset mechanism for driving the inner friction plate to disengage from the outer friction plate.

[0007] By adopting the above technical solution, the loader wet electric drive axle can not only effectively transmit power, but also maintain high operating stability and reliability in harsh working environments. Specifically, the half-axle passes through the half-axle sleeve and is connected to the wheel hub, ensuring efficient power transmission, so that the loader can travel and operate smoothly under various complex road conditions; the stop ring, the stop sleeve and the brake mechanism in the brake device work together to achieve effective locking of the half-axle through the abutment of the inner friction plate and the outer friction plate, ensuring that the vehicle can stop quickly in an emergency, thereby improving driving safety; the differential housing, the half-axle sleeve and the wheel hub constitute a closed space, and the transmission system and the brake device are all arranged in the closed space, which can effectively avoid external interference, and lubricant can be provided in the closed space, which can not only effectively reduce the friction between moving parts, extend the service life of parts and components, and reduce maintenance costs, but also cool the moving parts to achieve wet cooling; the presence of the reset mechanism allows the inner friction plate and the outer friction plate to be quickly separated after unlocking, avoiding wear and failure caused by long-term contact, and further improving the reliability and durability of the system.

[0008] Optionally, the braking mechanism includes a thrust sleeve and an abutment ring, the thrust sleeve is slidably connected to the half-shaft sleeve, and an expansion cavity is formed between the thrust sleeve and the half-shaft sleeve, the thrust sleeve drives the inner friction plate and the outer friction plate to move toward the abutment ring by changing the volume of the expansion cavity, and makes the inner friction plate abut against the outer friction plate to achieve locking of the half-shaft; the half-shaft sleeve is provided with a channel connected to the expansion cavity.

[0009] By adopting the above technical scheme, the half-axle can be effectively locked, thereby improving the control stability and safety of the loader under specific working conditions. Specifically, through the expansion cavity between the thrust sleeve and the half-axle sleeve, the contact and separation of the inner friction plate and the outer friction plate are controlled by utilizing the change of hydraulic or air pressure, so that the braking process is faster and more reliable; the channel connected to the expansion cavity provided on the half-axle sleeve ensures that the pressure medium (such as oil or gas) can smoothly enter the expansion cavity, thereby effectively transmitting the braking force and avoiding brake failure caused by insufficient pressure. In summary, this technical scheme not only improves the response speed and reliability of the braking system, but also simplifies the structure of the braking mechanism and reduces the difficulty of maintenance.

[0010] Further optionally, the output end of the half shaft is keyed to a driving gear; the hub comprises an outer shell and an inner shell that are detachably connected together; the abutment ring is fixed in the inner cavity of the outer shell, and a planetary gear set meshing with the driving gear is provided in the cavity formed by the abutment ring and the outer shell.

[0011] By adopting the above technical solution, the power output by the motor unit can be effectively transmitted to the wheel hub, and efficient power transmission is achieved. Specifically, the output end of the half shaft is connected with the driving gear key, so that the power can be accurately transmitted to the wheel hub through the gear set. The wheel hub is composed of a detachably connected outer shell and an inner shell, which is convenient for maintenance and repair. The abutment ring is placed in the stop sleeve, which can make full use of its own structure to limit the outer friction plate and the inner friction plate, ensuring the stability and reliability of the brake device. In addition, the planetary gear set is arranged in the inner cavity of the outer shell and meshes with the driving gear, further improving the transmission efficiency and the uniformity of power distribution. This design not only enhances the dynamic performance of the system, but also improves the overall reliability and durability. It is particularly important to note that the abutment ring, as the mounting platform of the planetary gear set, also assumes the role of limiting the brake pad, so that the friction plate locks the half shaft while also locking the wheel hub, achieving three goals at one stroke, further improving the stopping reliability, and greatly simplifying the structural design and saving the manufacturing cost.

[0012] Further optionally, the braking mechanism also includes an intermediate sleeve keyed to the half-shaft sleeve; the intermediate sleeve is slidably connected to a thrust ring at one end close to the stop ring, and the intermediate sleeve is circumferentially provided with guide holes arranged along the circumference; a push rod is slidably connected in the guide hole; the push rod is used to transmit the axial thrust of the thrust sleeve to the thrust ring to drive the inner friction plate to abut against the outer friction plate; the stop sleeve is fixed on the intermediate sleeve; and a limit ring for limiting the axial displacement of the intermediate sleeve is provided at the end of the half-shaft sleeve close to the stop ring.

[0013] By adopting the above technical solution, the brake mechanism is made more compact and efficient. The sliding connection design between the intermediate sleeve and the thrust ring, as well as the clever arrangement of the push rod, can effectively transmit the axial thrust of the thrust sleeve to the thrust ring, thereby quickly achieving the abutment of the inner friction plate and the outer friction plate to complete the locking action. This structure not only improves the braking response speed, but also enhances the reliability and stability of the system. In addition, the setting of the limit ring effectively limits the axial movement range of the intermediate sleeve, avoids functional failure caused by excessive movement, and further improves the safety performance of the overall device.

[0014] Further optionally, a first bearing platform and a second bearing platform are sequentially provided in the inner shell along the axial direction from the inside to the outside, and the inner diameter of the second bearing platform is not less than the diameter of the first bearing platform; the thrust sleeve is arranged between the first bearing platform and the second bearing platform.

[0015] By adopting the above technical solution, the inner diameter of the second bearing platform is not less than the diameter of the first bearing platform, which can better bear and disperse the axial force from the half-shaft, thereby improving the stability and reliability of the entire drive axle; the thrust sleeve is arranged between the first bearing platform and the second bearing platform, so that the thrust sleeve can distribute the pressure more evenly when subjected to force, avoiding local stress concentration, thereby extending the service life of key components and improving the performance of the overall system, and the second bearing platform can play a certain blocking role on the high-temperature lubricant in the wheel hub, and can protect the thrust sleeve and prevent the sealing ring in the thrust sleeve from aging too quickly.

[0016] Further optionally, a sealing mechanism is provided between the first bearing platform and the half-shaft sleeve, and the sealing mechanism includes a sealing sleeve fixed on the half-shaft sleeve and a sealing ring arranged between the sealing sleeve and the first bearing platform.

[0017] By adopting the above technical solution, external pollutants are effectively prevented from entering the wheel hub, ensuring the purity of the internal lubricant and the normal operation of the brake device, thereby improving the overall reliability and service life of the drive axle. In addition, the sealing mechanism can effectively prevent lubricant leakage, reduce maintenance costs, and ensure the stable operation of the equipment in harsh environments.

[0018] Further optionally, the outer wall of the half-axle sleeve is provided with a first shoulder, a second shoulder and a third shoulder with gradually decreasing outer diameters from the inside to the outside; a first bearing is provided between the first bearing platform and the first shoulder; a second bearing is provided between the second bearing platform and the third shoulder; the thrust sleeve is provided at the end of the second shoulder, and an expansion cavity is formed between the end of the thrust sleeve and the end of the second shoulder.

[0019] By adopting the above technical solution, the matching accuracy between the half-shaft sleeve and the bearing can be effectively improved, ensuring the stability and reliability during the transmission process. The design of the first shoulder and the third step helps to fix the position of the first bearing and the second bearing, avoiding displacement caused by vibration or impact, thereby extending the service life of the bearing; at the same time, the expansion cavity formed by the thrust sleeve and the end of the second shoulder can quickly generate sufficient pressure under the action of hydraulic pressure, so that the inner friction plate and the outer friction plate are in close contact, achieving a fast and reliable braking effect. This design not only improves the response speed of the braking system, but also maintains stable performance in a working environment with frequent starts and stops.

[0020] The reset mechanism comprises a support ring fixed on the limiting ring and a reset spring fixed between the support ring and the thrust ring.

[0021] By adopting the above technical solution, the return spring can quickly push the thrust ring away from the stop ring when the brake is released, so that the inner friction plate and the outer friction plate are quickly separated and the free rotation of the half shaft is restored. This design effectively shortens the braking response time and improves the dynamic performance and reliability of the system. At the same time, the stabilizing effect of the return spring can also avoid the wear of mechanical parts caused by long-term use, extending the service life of the entire drive axle.

[0022] A connecting disk is provided in the middle of the intermediate sleeve, the stop sleeve is key-connected to the connecting disk, and one end of the stop sleeve that cooperates with the connecting disk is provided with a positioning shoulder and a limit groove for limiting axial displacement; a first clamping ring is provided in the limit groove.

[0023] By adopting the above technical solution, the key connection between the stop sleeve and the connecting plate ensures that the two are firmly fixed in the axial direction. At the same time, the design of the positioning shoulder and the limit slot effectively limits the axial movement of the stop sleeve, enhancing the stability of the entire brake device. The first clamping ring is embedded in the limit slot, further enhancing the reliability of the structure and preventing the stop sleeve from being displaced due to vibration or impact, thereby ensuring the precise control and smooth operation of the brake device under high load conditions.

[0024] The limiting ring is threadedly connected to the half-shaft sleeve, and a positioning groove for preventing the limiting ring from loosening is provided at the end of the half-shaft sleeve, and the positioning groove is provided with a second clamping ring.

[0025] By adopting the above technical solution, the threaded connection between the limit ring and the half-axle sleeve ensures the stability of the structure and prevents loosening in a vibration and impact environment; the design of the positioning groove and the second retaining ring further enhances the fixing effect of the limit ring and avoids the limit ring from falling off due to external factors, thereby ensuring the reliability and stability of the braking mechanism.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application significantly improves the overall efficiency of the drive axle, especially showing stronger power and economy under high-load conditions. Through the synergy of the motor unit, the reducer unit and the differential unit, the power transmission is more efficient and stable; 2. This application fundamentally solves various faults caused by poor heat dissipation by introducing a wet cooling mechanism, greatly extending the service life of the equipment. The lubricant in the closed half-axle sleeve and the wheel hub can not only reduce the wear of the transmission parts, but also effectively take away the heat generated by the transmission parts to avoid overheating damage; 3. This application enhances the comprehensive protection performance of the system, and can maintain high operating stability and reliability even in harsh working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the appearance structure of the wet electric drive axle of the loader described in the first embodiment; Figure 2 is a schematic structural diagram of the differential housing described in Embodiment 1; Figure 3 It is a partial structural schematic diagram of the wet electric drive axle of the loader described in the first embodiment; Figure 4 is a schematic cross-sectional structural diagram of the outer shell described in Example 1; Figure 5 is a schematic side view of the structure of the outer shell in the first embodiment; Figure 6 is a schematic cross-sectional structural diagram of the inner shell described in Example 1; Figure 7 is a schematic diagram of the half-axle sleeve structure described in Example 1; Figure 8 It is a schematic diagram of the structure of the intermediate sleeve described in the first embodiment; Fig. 9 It is a schematic diagram of the partial structure of the wet electric drive axle of the loader described in the second embodiment.

[0028] In the figure: 1, differential housing; 2, half shaft; 3, half shaft sleeve; 31, first lifting shoulder; 32, second lifting shoulder; 33, third lifting shoulder; 34, channel; 35, positioning slot; 4, wheel hub; 41, outer housing; 411, abutment ring; 412, planetary gear set; 413, outer bearing platform; 42, inner housing; 421, first bearing platform; 422, second bearing platform; 423, first bearing; 424, second bearing; 5, brake device; 51, stop ring; 52, stop Moving sleeve; 521, limiting groove; 522, positioning shoulder; 523, oil leakage hole; 53, intermediate sleeve; 531, connecting plate; 532, thrust ring; 533, guide hole; 534, ejector rod; 54, inner friction plate; 55, outer friction plate; 56, thrust sleeve; 561, expansion cavity; 57, limiting ring; 58, first retaining ring; 59, second retaining ring; 6, sealing sleeve; 7, sealing ring; 8, support ring; 9, reset spring; 10, driving gear; 11, auxiliary bearing. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions of the various embodiments of the present application in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0030] Embodiment 1 Reference Figure 1~Figure 3 The embodiment of the present application discloses a wet electric drive axle for a loader, comprising a differential case 1, a half-axle 2, a half-axle sleeve 3, a wheel hub 4, a brake device 5 and a reset mechanism, wherein a half-axle 2 for providing a transmission torque to the wheel hub 4 is provided in the differential case 1, connecting flanges are provided on both sides of the differential case 1, half-axle sleeves 3 are installed through fastening bolts, and the wheel hub 4 is rotatably connected to the half-axle sleeve 3; the half-axle 2 passes through the half-axle sleeve 3 and is connected to the wheel hub 4, so as to drive the wheel hub 4 to rotate on the sleeve; the wheel hub 4 is a cavity structure, and a lubricant is provided in the cavity of the wheel hub 4 , and a brake device 5 for limiting the rotation of the half-shaft 2 is also provided in the cavity of the wheel hub 4; the brake device 5 includes a stop ring 51, a stop sleeve 52 and a brake mechanism; the stop ring 51 is key-connected to the half-shaft 2, and the outer wall key of the stop ring 51 is connected to the outer friction plate 55; the stop sleeve 52 is key-connected to the half-shaft sleeve 3, and the inner wall key of the stop sleeve 52 is connected to the inner friction plate 54; the brake mechanism is used to drive the inner friction plate 54 to abut against the outer friction plate 55 to perform a locking action; the half-shaft sleeve 3 is provided with a reset mechanism for driving the inner friction plate 54 to disengage from the outer friction plate 55.

[0031] Specifically, refer to Figure 2The differential housing 1 is made of high-strength alloy steel with excellent wear resistance and fatigue resistance; the half-shaft 2 is made of high-performance stainless steel, and the surface is chrome-plated to improve its corrosion resistance and smoothness; the half-shaft sleeve 3 is made of aluminum alloy, and the lightweight design helps to reduce the weight of the vehicle; the cavity structure of the wheel hub 4 is filled with special synthetic lubricant, which can not only lubricate the transmission parts, but also has a good heat dissipation effect.

[0032] Reference Figure 3 The stop ring 51 in the brake device 5 is made of high-strength carbon steel, and its inner and outer surfaces are precisely ground to ensure a close fit with the half-shaft 2 and the outer friction plate 55; the stop sleeve 52 is also made of high-strength carbon steel, and its inner surface is provided with a keyway to ensure a firm connection with the inner friction plate 54; the brake mechanism includes a thrust sleeve 56 and an abutment ring 411, the thrust sleeve 56 is slidably connected to the half-shaft sleeve 3, and an expansion cavity 561 is formed between the thrust sleeve 56 and the half-shaft sleeve 3, and the inner friction plate 54 and the outer friction plate 55 are driven to approach the abutment ring 411 by changing the volume of the expansion cavity 561, and the inner friction plate 54 and the outer friction plate 55 are abutted, and locked by friction; the half-shaft sleeve 3 is provided with a channel 34 connected to the expansion cavity 561, which is convenient for the entry and exit of hydraulic oil or compressed air.

[0033] Reference Figure 3~Figure 5 In order to effectively transmit the power output by the motor unit to the wheel hub 4 and realize efficient power transmission, the output end of the half shaft 2 is keyed to the driving gear 10; the wheel hub 4 includes an outer shell 41 and an inner shell 42 connected together by fastening bolts, and the abutment ring 411 is fixed in the inner cavity of the outer shell 41, and a planetary gear set 412 meshing with the driving gear 10 is provided in the cavity formed by the abutment plate and the outer shell 41; wherein, the abutment ring 411 serves as a mounting platform for the planetary gear set 412 and also assumes the role of limiting the brake pad, so that the friction plate locks the half shaft 2 while also locking the wheel hub 4, achieving three goals at one stroke, further improving the stopping reliability, and greatly simplifying the structural design, saving the manufacturing cost.

[0034] Reference Figure 6~Figure 8A first bearing platform 421 and a second bearing platform 422 are sequentially arranged in the inner shell 42 along the axial direction from the inside to the outside, and the inner diameter of the second bearing platform 422 is not less than the diameter of the first bearing platform 421; a thrust sleeve 56 is arranged between the first bearing platform 421 and the second bearing platform 422; a sealing mechanism is arranged between the first bearing platform 421 and the half-shaft sleeve 3, and the sealing structure includes a sealing sleeve 6 fixed on the half-shaft sleeve 3 and a sealing ring 7 arranged between the sealing sleeve 6 and the first bearing platform 421; a first shoulder 31, a second shoulder 32 and a third step with gradually decreasing outer diameters are sequentially arranged on the outer wall of the half-shaft sleeve 3 from the inside to the outside; a first bearing 423 is arranged between the first bearing platform 421 and the first shoulder 31; a second bearing 424 is arranged between the second bearing platform 422 and the third shoulder 33; the thrust sleeve 56 is sleeved on the end of the second shoulder 32, and an expansion cavity 561 is formed between the end of the thrust sleeve 56 and the end of the second shoulder 32.

[0035] Reference Figure 6~Figure 8 In order to make the brake mechanism more compact and efficient, and to effectively transmit the axial thrust of the thrust sleeve 56 to the thrust ring 532, so as to quickly realize the abutment between the inner friction plate 54 and the outer friction plate 55 and complete the locking action, the brake mechanism also includes an intermediate sleeve 53 connected to the half-shaft sleeve 3 by a key; the intermediate sleeve 53 can provide a mounting platform for the bearing while transmitting the thrust; specifically, the inner wall of the intermediate sleeve 53 is provided with a keyway adapted to the spline on the half-shaft sleeve 3; the intermediate sleeve 53 is provided with a keyway near the stop One end of the moving ring 51 is slidably connected with a thrust ring 532, and the circumferential direction of the intermediate sleeve 53 is provided with guide holes 533 arranged along the circumferential direction; a push rod 534 is slidably connected in the guide hole 533; the push rod 534 is used to transmit the axial thrust of the thrust sleeve 56 to the thrust ring 532, so as to drive the inner friction plate 54 to abut against the outer friction plate 55; the stop sleeve 52 is fixed on the intermediate sleeve 53; the end of the half-shaft sleeve 3 close to the stop ring 51 is provided with a limit ring 57 for limiting the axial displacement of the intermediate sleeve 53.

[0036] Reference Figure 6 The reset mechanism includes a support ring 8 fixed on the limit ring 57 and a reset spring 9 fixed between the support ring 8 and the thrust ring 532; the limit ring 57 is threadedly connected to the half-shaft sleeve 3, and the end of the half-shaft sleeve 3 is provided with a positioning groove 35 to prevent the limit ring 57 from loosening, and the groove is provided with a second retaining ring 59 to ensure that the limit ring 57 will not loosen due to vibration.

[0037] Reference Figure 8A connecting disk 531 is provided in the middle of the middle sleeve 53, and the stop sleeve 52 is key-connected to the connecting disk 531, and one end of the stop sleeve 52 that cooperates with the connecting disk 531 is provided with a positioning shoulder 522 and a limiting groove 521 for limiting axial displacement, and a first retaining ring 58 is provided in the limiting groove 521 to ensure the stability and reliability of the stop sleeve 52; in order to enhance the circulation speed of the lubricating oil on the stop sleeve 52 and improve the heat dissipation efficiency, an oil leakage hole 523 is provided on the stop sleeve 52.

[0038] The implementation principle of this embodiment is as follows: the loader wet electric drive axle can not only effectively transmit power, but also maintain high operating stability and reliability in harsh working environments. Specifically, the half-shaft 2 passes through the half-shaft sleeve 3 and is connected to the wheel hub 4, ensuring efficient power transmission, so that the loader can travel and operate smoothly under various complex road conditions; the stop ring 51, the stop sleeve 52 and the brake mechanism in the brake device 5 work together to achieve effective locking of the half-shaft 2 through the abutment of the inner friction plate 54 and the outer friction plate 55, ensuring that the vehicle can stop quickly in an emergency, thereby improving driving safety. The differential housing 1, the half-axle sleeve 3 and the wheel hub 4 form a closed space, and the transmission system and the brake device 5 are arranged in the closed space, which can effectively avoid external interference, and a lubricant can be provided in the closed space, which can not only effectively reduce the friction between the moving parts, extend the service life of the parts, and reduce the maintenance cost, but also cool the moving parts to achieve wet cooling; the presence of the reset mechanism allows the inner friction plate 54 and the outer friction plate 55 to be quickly separated after the lock is released, avoiding wear and failure caused by long-term contact, and further improving the reliability and durability of the system.

[0039] Embodiment 2 Reference Fig. 9 The embodiment of the present application discloses a wet electric drive axle for a loader. The difference from the first embodiment is that an auxiliary bearing 11 is provided between the half-shaft 2 and the half-shaft sleeve 3 to improve the load-bearing capacity of the half-shaft 2, and only a first bearing platform 421 is provided on the inner shell 42 of the wheel hub 4. At the same time, an outer bearing platform 413 is provided on the outer shell 41.

[0040] The implementation principle of this embodiment is as follows: only the first bearing platform 421 is provided on the inner shell 42, which can simplify the structure of the inner shell 42 and the intermediate sleeve 53, reduce the difficulty of manufacturing the inner shell 42 and the intermediate sleeve 53, and save costs. An auxiliary bearing 11 is provided between the half-shaft 2 and the half-shaft sleeve 3, which helps to reduce the vibration and wear of the half-shaft during high-speed operation and improve the stability and life of the transmission system; a first bearing platform 421 is provided on the inner shell of the wheel hub 4, which can better support the half-shaft 2 and ensure transmission accuracy and reliability; an outer bearing platform is provided on the outer shell 41, which further enhances the overall rigidity and load-bearing capacity of the wheel hub 4 and improves the overall braking effect and safety.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application.

Claims

1. A wet electric drive axle for a loader, comprising a differential housing (1), wherein a half shaft (2) is provided in the differential housing (1) for providing a transmission torque for a wheel hub (4), wherein: Axle sleeves (3) are installed on both sides of the differential housing (1), and a wheel hub (4) is rotatably connected to the axle sleeves (3); the axle (2) passes through the axle sleeves (3) and is connected to the wheel hub (4) for driving the wheel hub (4) to rotate on the sleeves; the wheel hub (4) is a hollow structure, a lubricant is provided in the cavity of the wheel hub (4), and a brake device (5) for limiting the rotation of the axle (2) is also provided in the cavity of the wheel hub (4); the brake device (5) comprises a stop ring (51), a stop sleeve (52), and a stop ring (53). 2) and a braking mechanism; the stop ring (51) is key-connected to the half shaft (2), and the outer wall key of the stop ring (51) is key-connected to the outer friction plate (55); the stop sleeve (52) is key-connected to the half shaft sleeve (3), and the inner wall key of the stop sleeve (52) is key-connected to the inner friction plate (54); the braking mechanism is used to drive the inner friction plate (54) to abut against the outer friction plate (55) to perform a locking action; the half shaft sleeve (3) is provided with a reset mechanism for driving the inner friction plate (54) to disengage from the outer friction plate (55).

2. The loader wet electric drive axle according to claim 1, characterized in that: The braking mechanism comprises a thrust sleeve (56) and an abutment ring (411); the thrust sleeve (56) is slidably connected to the half-shaft sleeve (3); an expansion cavity (561) is formed between the thrust sleeve (56) and the half-shaft sleeve (3); the thrust sleeve (56) drives the inner friction plate (54) and the outer friction plate (55) to move toward the abutment ring (411) by changing the volume of the expansion cavity (561), and causes the inner friction plate (54) to abut against the outer friction plate (55), so as to achieve locking of the half-shaft (2); and the half-shaft sleeve (3) is provided with a channel (34) connected to the expansion cavity (561).

3. The loader wet electric drive axle according to claim 2, characterized in that: The output end of the half shaft (2) is key-connected with a driving gear (10); the wheel hub (4) comprises an outer shell (41) and an inner shell (42) which are detachably connected together; the abutment ring (411) is fixed in the inner cavity of the outer shell (41), and a planetary gear set (412) meshing with the driving gear (10) is provided in the cavity formed by the abutment ring (411) and the outer shell (41).

4. The loader wet electric drive axle according to claim 2, characterized in that: The brake mechanism further comprises an intermediate sleeve (53) key-connected to the half-shaft sleeve (3); the intermediate sleeve (53) is slidably connected to a thrust ring (532) at one end close to the stop ring (51), and the intermediate sleeve (53) is provided with guide holes (533) arranged along the circumference; a push rod (534) is slidably connected in the guide hole (533); the push rod (534) is used to transmit the axial thrust of the thrust sleeve (56) to the thrust ring (532) to drive the inner friction plate (54) to abut against the outer friction plate (55); the stop sleeve (52) is fixed on the intermediate sleeve (53); and a limit ring (57) is provided at the end of the half-shaft sleeve (3) close to the stop ring (51) for limiting the axial displacement of the intermediate sleeve (53).

5. The loader wet electric drive axle according to claim 3, characterized in that: A first bearing platform (421) and a second bearing platform (422) are provided in the inner housing (42) in sequence along the axial direction from the inside to the outside, and the inner diameter of the second bearing platform (422) is not less than the diameter of the first bearing platform (421); the thrust sleeve (56) is arranged between the first bearing platform (421) and the second bearing platform (422).

6. The loader wet electric drive axle according to claim 5, characterized in that: A sealing mechanism is provided between the first bearing platform (421) and the half-shaft sleeve (3), the sealing mechanism comprising a sealing sleeve (6) fixed on the half-shaft sleeve (3) and a sealing ring (7) provided between the sealing sleeve (6) and the first bearing platform (421).

7. The loader wet electric drive axle according to claim 5, characterized in that: The outer wall of the half-axle sleeve (3) is provided with a first shoulder (31), a second shoulder (32) and a third shoulder (33) with gradually decreasing outer diameters from the inside to the outside; a first bearing (423) is provided between the first bearing platform (421) and the first shoulder (31); a second bearing (424) is provided between the second bearing platform (422) and the third shoulder (33); the thrust sleeve (56) is sleeved on the end of the second shoulder (32), and an expansion cavity (561) is formed between the end of the thrust sleeve (56) and the end of the second shoulder (32).

8. The loader wet electric drive axle according to claim 4, characterized in that: The reset mechanism comprises a support ring (8) fixed on the limit ring (57) and a reset spring (9) fixed between the support ring (8) and the thrust ring (532).

9. The loader wet electric drive axle according to claim 4, characterized in that: The limiting ring (57) is threadedly connected to the half-shaft sleeve (3), and a positioning groove (35) is provided at the end of the half-shaft sleeve (3) to prevent the limiting ring (57) from loosening, and the positioning groove (35) is provided with a first clamping ring (58).

10. The loader wet electric drive axle according to claim 4, characterized in that: A connecting disk (531) is provided in the middle of the intermediate sleeve (53), the stop sleeve (52) is key-connected to the connecting disk (531), and one end of the stop sleeve (52) that cooperates with the connecting disk (531) is provided with a positioning shoulder (522) and a limiting groove (521) for limiting axial displacement; a second clamping ring (59) is provided in the limiting groove (521).

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