Transmission structure and electric drive axle

Abstract

The invention provides a transmission structure and an electric drive axle, the transmission structure comprises an input shaft and an intermediate shaft, the input shaft is provided with a plurality of input gears, the input gears comprise a first input gear and a second input gear, the radial size of the second input gear is larger than that of the first input gear, and the intermediate shaft is provided with a plurality of output gears. The multiple input gears are arranged at intervals in the axis direction of the input shaft, and the first input gear and the input shaft are integrally formed. According to the transmission structure and the electric drive axle, part of the input gear and the input shaft which are small in radial size are integrally formed, compared with a split assembly mode, a connecting part is omitted, the size of the input shaft is reduced, meanwhile, the input gear integrally formed on the input shaft has the relatively high strength, and the service life of the input gear is prolonged. A part of the input gear with a large radial size and the input shaft are assembled and connected by adopting a split structure, so that part of processing cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric drive axle, in particular to a transmission structure and electric drive axle. BACKGROUND

[0002] The electric drive axle refers to the whole composed of motor, gearbox and the like, which is used to drive wheels. For example, the transmission structure disclosed in the publication No. CN202098528U includes a motor, a gearbox and a half shaft. The electric drive axle generates power by the motor and transmits the power to the gearbox connected thereto, and the gearbox drives the vehicle to run through the half shaft connected thereto. The gearbox is provided with an output shaft and a transmission shaft to transmit the power from the power source.

[0003] In the transmission structure of the conventional electric drive axle, the input gear on the power input shaft is installed on the input shaft in the way of spline and key. The manufacture of the spline requires high technology and equipment, and the processing process is relatively complex. Special processing equipment and technology are required, and the hardness of the processing material and the size of the workpiece will also affect the processing cost. Therefore, the processing cost of the spline is relatively high. The key processing requires high-precision manufacturing equipment and workers with high technical level. In addition, different hardness of the workpiece will result in greater processing difficulty. SUMMARY

[0004] The present application aims to provide a transmission structure and electric drive axle capable of reducing the processing cost of the input gear on the input shaft.

[0005] In order to achieve the above-mentioned purpose, the present application provides a transmission structure, which comprises:

[0006] An input shaft and an intermediate shaft, the input shaft is provided with a plurality of input gears, the input gears include a first input gear and a second input gear, the radial dimension of the second input gear is greater than that of the first input gear, the plurality of input gears are arranged at intervals along the axial direction of the input shaft, the first input gear and the input shaft are integrally formed, the second input gear and the input shaft are connected by assembly, the intermediate shaft is provided with a plurality of intermediate gears, and the intermediate gears and the input gears are connected in mesh.

[0007] Preferably, the second input gear is a ring-shaped input gear, which is sleeved on the outside of the input shaft, and the outer wall of the input shaft and the inner wall of the ring of the second input gear are in interference fit and fixed by pin riveting.

[0008] Preferably, the intermediate gears include a first intermediate gear and a second intermediate gear, the first input gear and the first intermediate gear are meshed, and the second input gear and the second intermediate gear are meshed.

[0009] Preferably, the first input gear comprises a plurality of first input teeth blocks, which are arranged at intervals along the circumference of the first input shaft, and first input tooth grooves are formed between adjacent first input teeth blocks.

[0010] Preferably, in the axial direction of the input shaft, the connection between the bottom of the first input tooth groove and the radially outer side of the input shaft is a smooth transition.

[0011] Preferably, the input gear further comprises a third input gear, the intermediate gear further comprises a third intermediate gear, the radial dimension of the third input gear is smaller than that of the second input gear, the third input gear and the third intermediate gear are engaged, the third input gear and the input shaft are integrally formed, the third input gear comprises a third input tooth ring and a third input tooth block, and the outer wall of the input shaft extends outward to form the third input tooth ring and the third input tooth block in sequence, and the third input tooth block is arranged at intervals along the circumference of the third input tooth ring.

[0012] Preferably, the intermediate shaft is provided with a shaft hole communicating between the two ends of the axial direction of the intermediate shaft, and the intermediate shaft is provided with an oil outlet hole communicating between the inside and outside of the intermediate shaft.

[0013] The transmission structure further comprises an intermediate bearing and a fastener, the intermediate bearing is connected to the intermediate shaft through the fastener, the fastener is provided with a connecting hole communicating between the two ends of the axial direction of the fastener, the connecting hole and the shaft hole are connected, and an oil storage step is formed between the inner wall of the connecting hole and the inner wall of the shaft hole.

[0014] Preferably, the intermediate gear and the intermediate shaft are rotationally connected, the transmission structure further comprises a synchronization sleeve, the synchronization sleeve is connected to the intermediate shaft and the intermediate gear in a sliding manner along the axial direction of the intermediate shaft, the synchronization sleeve and the intermediate shaft are clamped in the circumferential direction of the intermediate shaft, and the synchronization sleeve and the intermediate gear are keyed.

[0015] The application also provides an electric drive axle, which comprises the above transmission structure and further comprises:

[0016] A gearbox, the gearbox comprises a housing, the housing is provided with the transmission structure and a differential mechanism inside, and the intermediate shaft is drivingly connected to the differential mechanism;

[0017] An axle housing, the axle housing is connected to the axle housing connecting surface on the gearbox, and the part of the housing for accommodating the differential mechanism is located inside the axle housing;

[0018] An axial flux motor, the axial flux motor is connected to the motor connecting surface on the gearbox.

[0019] Compared with the prior art, the technical scheme has the following advantages:

[0020] The transmission structure and the electric drive axle, by integrally forming part of the input gear with a smaller radial dimension and the input shaft, compared with the split assembly mode, saves the connection part to reduce the size of the input shaft, and the input gear integrally formed on the input shaft has relatively higher strength, and the split structure between part of the input gear with a larger radial dimension and the input shaft is connected by assembly to reduce part of the processing cost.

[0021] Compared with the traditional motor, the axial dimension is large, there is not enough margin for one-axis multi-gear arrangement, otherwise it will interfere with the air chamber, frame and the like, so at least three or four gear arrangements are required, and the structure is relatively complex, the transmission structure and the electric drive axle, according to the motor advantage, the axial dimension of the motor is shorter than that of the traditional radial motor, the transmission box shaft arrangement can be one-axis multi-gear, only two gears are required to meet the requirements.

[0022] The present application will be further described below in combination with the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the transmission structure of the present application as a whole.

[0024] Figure 2 It is a schematic diagram of the input shaft cross section of the transmission structure of the present application.

[0025] Figure 3 It is a schematic diagram of the intermediate shaft cross section of the transmission structure of the present application.

[0026] Figure 4 It is a schematic diagram of the housing of the transmission box of the electric drive axle of the present application.

[0027] Figure 5 It is a schematic diagram of the electric drive axle of the present application as a whole.

[0028] In the figure: 100, gearbox; 110, housing; 111b, bridge housing connection surface; 112a, half shaft connection surface; 121, input shaft; 122, intermediate shaft; 1221, shaft hole; 1222, oil outlet hole; 1223, intermediate bearing; 1224, fastener; 1224a, abutment portion; 1224b, connection portion; 12241, connection hole; 12242, oil storage step; 125, intermediate gear; 125a, first intermediate gear; 125b, second intermediate gear; 1 25c, third intermediate gear; 1255, synchronizer ring; 126, input gear; 126a, first input gear; 126a1, first input tooth block; 126a2, first input tooth groove; 126b, second input gear; 126c, third input gear; 126c1, third input ring gear; 126c2, third input tooth block; 127, synchronizer sleeve; 128, retaining ring; 129, shift fork; 130, differential; 200, axial flux motor; 300, axle housing DETAILED DESCRIPTION

[0029] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0030] like Figures 1-3 As shown, the present invention provides a transmission structure, comprising:

[0031] An input shaft 121 is provided with a plurality of input gears 126 , which are spaced apart along the axis of the input shaft 121 . The input gears 126 with smaller radial dimensions are integrally formed with the input shaft 121 , while the input gears 126 with larger radial dimensions are assembled with the input shaft 121 .

[0032] The intermediate shaft 122 is provided with a plurality of intermediate gears 125 , and the intermediate gears 125 are meshedly connected with the input gear 126 .

[0033] According to the above definition, some of the input gears 126 with smaller radial dimensions are integrally formed with the input shaft 121. Compared with the split assembly method, the connecting part is omitted to reduce the size of the input shaft 121. At the same time, the input gear 126 integrally formed on the input shaft 121 has relatively higher strength; some of the input gears 126 with larger radial dimensions are connected to the input shaft 121 through assembly using a split structure to reduce some processing costs.

[0034] Optionally, the small radial dimension input gear 126 is integrally formed on the input shaft 121 by machining or casting, and the large radial dimension input gear 126 is interference fit and pinned to the input shaft 121.

[0035] As a preferred embodiment, referring to Figures 1-3 , the input gear 126 comprises a first input gear 126a, a second input gear 126b and a third input gear 126c arranged along the axis of the input shaft 121 in sequence and at intervals;

[0036] The intermediate gear 125 comprises a first intermediate gear 125a, a second intermediate gear 125b and a third intermediate gear 125c arranged along the axis of the intermediate shaft 122 in sequence and at intervals;

[0037] The first input gear 126a and the first intermediate gear 125a are meshed, the second input gear 126b and the second intermediate gear 125b are meshed, and the third input gear 126c and the third intermediate gear 125c are meshed.

[0038] As a preferred embodiment, referring to Figure 2 , the radial dimension of the first input gear 126a is smaller than that of the second input gear 126b, the radial dimension of the third input gear 126c is smaller than that of the second input gear 126b, the first input gear 126a and the input shaft 121 are integrally formed, the third input gear 126c and the input shaft 121 are integrally formed, and the second input gear 126b and the input shaft 121 are assembled. The radial dimension of the first input gear 126a is smaller than that of the third input gear 126c.

[0039] The radial dimension of the first input gear 126a and the third input gear 126c is not greater than twice the radial dimension of the input shaft 121. The input gear 126 with smaller radial dimension can produce smaller torque during transmission, and the input shaft 121 produces small torque output, which helps to reduce the burden of the power source driving the input shaft 121, improve the efficiency of the gearbox, and reduce the impact and jerk between the gears during gear shifting, which helps to improve the smoothness of gear shifting and reduce vibration and noise.

[0040] More specifically, referring to Figures 1-2The first input gear 126a comprises a plurality of first input tooth blocks 126a1 arranged at intervals along the circumference of the first input shaft 121, wherein a first input tooth groove 126a2 is formed between adjacent first input tooth blocks 126a1.

[0041] In the axial direction of the input shaft 121, the connection between the bottom of the first input tooth groove 126a2 and the radially outer side of the input shaft 121 is a smooth transition to form a gentle slope between the first input tooth groove 126a2 and the outer wall of the input shaft 121, avoiding slotting on the outer wall of the input shaft 121 to reduce its structural stability.

[0042] Referring to Figure 1 and 2 The third input gear 126c comprises a third input tooth ring 126c1 and a third input tooth block 126c2, and the outer wall of the input shaft 121 extends outward to form the third input tooth ring 126c1 and the third input tooth block 126c2 in sequence, and the third input tooth block 126c2 is arranged at intervals along the circumference of the third input tooth ring 126c1.

[0043] The second input gear 126b is a ring-shaped second input gear 126b, which is sleeved on the outside of the input shaft 121, and the outer wall of the input shaft 121 and the inner wall of the second input gear 126b are in interference fit, and the input shaft 121 and the second input gear 126b are fixed by pin riveting.

[0044] It can be seen that in the present scheme, the assembly method of the second input gear 126b and the input shaft 121, as well as the assembly of the first input gear 126a, the third input gear 126c and the input shaft 121, all do not use the assembly method of spline and key, avoiding the problems of high production cost of spline and difficult assembly of key.

[0045] Regarding the specific structure of the intermediate shaft 122, as a preferred embodiment, referring to Figure 3The intermediate shaft 122 is a hollow intermediate shaft 122, and an oil outlet hole 1222 is arranged on the intermediate shaft 122 to communicate the inside and outside of the intermediate shaft 122. The oil outlet hole 1222 is provided in multiple groups, and the number of the oil outlet holes 1222 in each group is multiple. Adjacent groups of the oil outlet holes 1222 are arranged in the axial direction of the intermediate shaft 122, and the oil outlet holes 1222 in each group are arranged in the circumferential direction of the intermediate shaft 122. In use, the lubricating oil in the oil passage structure outside the intermediate shaft 122 can enter the intermediate shaft 122, and the oil can be thrown out through the oil outlet hole 1222 during high-speed rotation of the intermediate shaft 122, thereby achieving the lubricating effect on the external gear.

[0046] Continuing to refer to Figure 3 The intermediate shaft 122 is provided with a shaft hole 1221 that communicates both ends in the axial direction of the intermediate shaft 122. The transmission structure further comprises: intermediate bearings 1223 arranged at both ends in the axial direction of the intermediate shaft 122, and the intermediate shaft 122 is rotatably connected to the housing 110 of the transmission case 100 through the intermediate bearings 1223.

[0047] Fasteners 1224 are connected to the intermediate bearings 1223 and the intermediate shaft 122, and the fasteners 1224 are provided with connecting holes 12241 that communicate both ends in the axial direction of the fasteners 1224. The connecting holes 12241 and the shaft holes 1221 are in communication, and an oil storage step 12242 is formed between the inner wall of the connecting hole 12241 and the inner wall of the shaft hole 1221.

[0048] Further, the connecting hole 12241 and the shaft hole 1221 are coaxially arranged.

[0049] Further, the end face of the fastener 1224 located in the shaft hole 1221 is provided with a chamfer on the radially outer side. In use, part of the oil in the shaft hole 1221 can stay in the annular area formed by the chamfer, thereby improving the oil storage effect in the shaft hole 1221.

[0050] In one embodiment, the fastener 1224 comprises an abutting portion 1224a and a connecting portion 1224b connected in sequence in the axial direction. The abutting portion 1224a is connected to the intermediate bearing 1223, and the connecting portion 1224b is screwed into the shaft hole 1221.

[0051] In another embodiment, the fastener 1224 and the intermediate bearing 1223 are nut bearings, and the transmission structure is applied to heavy trucks. The torque and impact of heavy trucks are large, the housing 110 is an aluminum housing, the impact resistance of the housing 110 is small, and the nut bearing fixation can reduce the impact.

[0052] As to the specific connection structure of the intermediate gear 125 and the intermediate shaft 122, refer to Figure 3 The intermediate gear 125 is rotatably connected to the intermediate shaft 122, and optionally, the intermediate gear 125 is mounted on the outer side of the intermediate shaft 122 through a roller bearing, and the intermediate gear 125 is provided with a synchronizing ring 1255 on one side in the axial direction of the intermediate shaft 122;

[0053] A synchronizing sleeve 127 is movably arranged in the axial direction of the intermediate shaft 122, and the synchronizing sleeve 127 and the intermediate shaft 122 are clamped in the circumferential direction of the intermediate shaft 122, and the synchronizing sleeve 127 and the synchronizing ring 1255 are keyed connected; the synchronizing sleeve 127 and the intermediate shaft 122 are slidingly connected in the axial direction of the intermediate shaft 122, and the synchronizing sleeve 127 and the synchronizing ring 1255 are slidingly connected;

[0054] The corresponding keys and key grooves between the synchronizing sleeve 127 and the synchronizing ring 1255 are clearance fitted in the radial direction, and specifically, the corresponding key top surface and key groove bottom surface between the synchronizing sleeve 127 and the synchronizing ring 1255 are clearance fitted;

[0055] The keys on the synchronizing sleeve 127 or the synchronizing ring 1255 are provided with multiple groups, the number of keys in each group is multiple and arranged in the circumferential direction, and a tooth missing positioning structure is arranged between the adjacent two groups of keys, the tooth missing positioning structure is provided with a limiting surface 12511, the limiting surface 12511 and the opposite key top surface are in abutment, and the intermediate gear 125, the synchronizing sleeve 127 and the intermediate shaft 122 are concentrically arranged.

[0056] In use, by adjusting the position of the synchronizing sleeve 127 in the axial direction of the intermediate shaft 122, the synchronizing sleeve 127 is keyed connected with the synchronizing ring 1255 while being clamped with the intermediate shaft 122, so that the intermediate shaft 122 is synchronized with the target intermediate gear 125 through the intermediate gear 125, the gear shifting operation is realized, the gap is reserved between the corresponding keys and key grooves between the synchronizing sleeve 127 and the intermediate gear 125, a certain redundant space is provided when the synchronizing sleeve 127 and the intermediate gear 125 are keyed connected, so as to ensure that the keys on the two are quickly entered into the corresponding key grooves, further, the tooth missing positioning structure is arranged between the synchronizing sleeve 127 and the intermediate gear 125, the tooth missing positioning structure is in abutment with the opposite key, the concentricity between the intermediate gear 125, the synchronizing sleeve 127 and the intermediate shaft 122 is improved, and the problem that the keys and keys are rubbed due to errors when directly connected in the way of flat keys and spline keys, affecting the service life of the transmission structure is avoided.

[0057] To ensure that the toothless positioning structure can multi-angle extrude the key on the synchronization sleeve 127, further, the number of the toothless positioning structure is multiple, and the toothless positioning structures are arranged at equal intervals around the circumference of the synchronization ring 1255. As a preferred embodiment, the number of the toothless positioning structures is three.

[0058] Referring to Figure 3 , the transmission structure further comprises:

[0059] The fixed ring 128 is fixedly connected to the intermediate shaft 122, and the fixed ring 128 and the synchronization sleeve 127 are in key connection in the circumferential direction of the intermediate shaft 122, and the fixed ring 128 and the synchronization sleeve 127 are in sliding connection in the circumferential direction of the intermediate shaft 122.

[0060] The shift fork 129 is rotationally connected to the synchronization sleeve 127, and the shift fork 129 is movably mounted on the housing 110 of the transmission 100, and the shift fork 129 is drivingly connected to the synchronization sleeve 127.

[0061] It should be noted that the shift fork 129 is connected to the shift execution structure, and the shift execution structure drives the shift fork 129 to move in the transmission 100, which is a mature technology known to those skilled in the art, and will not be described in detail here.

[0062] In addition, the application also provides an electric drive axle, referring to Figure 4 and 5 , comprising the above transmission structure, further comprising a transmission 100, the transmission 100 comprising a housing 110, the housing 110 is provided with a transmission structure and a differential 130 inside, wherein the intermediate shaft 122 is drivingly connected to the differential 130;

[0063] The axle housing 300 is connected with the axle housing connecting surface 111b on the transmission 100, and the part of the housing 110 of the transmission 100 for accommodating the differential 130 is located inside the axle housing 300;

[0064] The axial flux motor 200 is connected with the motor connecting surface 111a on the transmission 100. The axial flux motor 200 has the advantage of small thickness, so that the electric drive axle has small volume.

[0065] The transmission structure and the electric drive axle adopt three-gear transmission. When the synchronization sleeve 127 and the first intermediate gear 125a are connected, the first input gear 126a, the first intermediate gear 125a and the differential are sequentially connected in transmission to form the first gear. When the synchronization sleeve 127 and the second intermediate gear 125b are connected, the second input gear 126b, the second intermediate gear 125b and the differential are sequentially connected in transmission to form the second gear. When the synchronization sleeve 127 and the third intermediate gear 125c are connected, the third input gear 126c, the third intermediate gear 125c and the differential are sequentially connected in transmission to form the third gear.

[0066] In summary, the transmission structure and the electric drive axle have the following advantages:

[0067] 1. Structural advantage:

[0068] According to the advantages of the motor, the axial size of the motor is half of that of the traditional motor, the shaft system arrangement of the gearbox can be multi-gear on one shaft, and only two gears are required to meet the requirements. Compared with the traditional motor, the axial size is large, and there is not enough margin for multi-gear arrangement on one shaft, otherwise it will interfere with the air chamber, frame, etc. Therefore, at least three or four gears are required for arrangement, and the structure is relatively complex.

[0069] 2. High transmission efficiency:

[0070] ①. Compared with the traditional gearbox which adopts at least three or four gears, the gear meshing is more, and the oil stirring loss is large. The gearbox provided in the embodiment has only two gears, the gear meshing is less, and the transmission efficiency is high;

[0071] ②. The gearbox adopts three-gear transmission. Since the disc motor has a large high-efficiency interval, the motor is basically in the high-efficiency interval under basic vehicle speed conditions.

[0072] 3. The gearbox has three gears, good power performance and economy, the maximum climbing degree > 37.1%, and the maximum vehicle speed > 115Km / h;

[0073] 4. Good NVH performance: each gear corresponds to a special gear meshing, and each gear has different working conditions. The traditional gearbox cannot be designed and repaired specifically due to the large number of transmission gears and shared gears, resulting in poor NVH;

[0074] 5. Manufacturing and processing technology, assembly technology, compared with the traditional gearbox, it is simpler and easier to realize batch production of products;

[0075] 6. Make full use of the characteristics of axial flux motor, such as fast speed regulation, cancel the clutch, avoid the difficulty of slip control of traditional gearbox clutch and the problem of heat dissipation of clutch;

[0076] 7. Make full use of the characteristics of the axial flux motor, such as fast speed regulation and small error, cancel the synchronizer, avoid the control of the synchronizer during operation, and reduce the control difficulty;

[0077] 8. Without synchronizer and clutch, the cost is lower, the shift noise is smaller, and the after-sales service cost is lower.

[0078] The above-described embodiments are only used to illustrate the technical ideas and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot be limited to the patent application range of the present application only by the above-described embodiments, that is, any equivalent changes or modifications made according to the spirit disclosed by the present application still fall within the patent scope of the present application.

Claims

1. A transmission structure, characterized by, The utility model relates to a kind of input shaft (121) and intermediate shaft (122), the input shaft (121) is provided with several input gear (126), the input gear (126) includes first input gear (126a) and second input gear (126b), the radial dimension of the second input gear (126b) is greater than the radial dimension of the first input gear (126a), the several input gear (126) is arranged along the axial direction of the input shaft (121), the first input gear (126a) and the input shaft (121) are integrally formed, the second input gear (126b) and the input shaft (121) are assembled connection, the intermediate shaft (122) is provided with several intermediate gear (125), the intermediate gear (125) and the input gear (126) are engaged connection. The second input gear (126b) is an input gear in the form of a ring, which is fitted on the outside of the input shaft (121), and the outer wall of the input shaft (121) and the inner wall of the ring of the second input gear (126b) are in interference fit and fixed by pin riveting.

2. The transmission arrangement of claim 1, wherein, The intermediate gear (125) includes a first intermediate gear (125a) and a second intermediate gear (125b), the first input gear (126a) and the first intermediate gear (125a) are engaged, and the second input gear (126b) and the second intermediate gear (125b) are engaged.

3. The transmission arrangement of claim 1, wherein, The first input gear (126a) includes a plurality of first input teeth (126a1) arranged along the circumference of the first input shaft (121), wherein a first input tooth groove (126a2) is formed between adjacent first input teeth (126a1), and the top surface of the first input teeth (126a1) is flush with the outer wall of the input shaft (121).

4. The transmission arrangement of claim 3, wherein, In the axial direction of the input shaft (121), the connection between the bottom surface of the first input tooth groove (126a2) and the radially outer side of the input shaft (121) is a smooth transition.

5. The transmission arrangement of claim 4, wherein, The input gear (126) further includes a third input gear (126c), and the intermediate gear (125) further includes a third intermediate gear (125c), the radial dimension of the third input gear (126c) is smaller than the radial dimension of the second input gear (126b), the third input gear (126c) and the third intermediate gear (125c) are engaged, the third input gear (126c) and the input shaft (121) are integrally formed, the third input gear (126c) includes a third input gear ring (126c1) and a third input gear block (126c2), the outer wall of the input shaft (121) extends outward to form the third input gear ring (126c1) and the third input gear block (126c2) in sequence, and the third input gear block (126c2) is arranged along the circumference of the third input gear ring (126c1).

6. The transmission arrangement of claim 3, wherein, ​ 7. The transmission arrangement of claim 1, wherein, The intermediate shaft (122) is provided with a shaft hole (1221) communicating both ends of the axis of the intermediate shaft (122), and the intermediate shaft (122) is provided with an oil outlet hole (1222) communicating the inside and outside of the intermediate shaft (122); The transmission structure further comprises an intermediate bearing (1223) and a fastener (1224), the intermediate bearing (1223) is connected with the intermediate shaft (122) through the fastener (1224), the fastener (1224) is provided with a connecting hole (12241) communicating both ends of the axis of the fastener (1224), the connecting hole (12241) and the shaft hole (1221) are communicated, and an oil storage step (12242) is formed between the inner wall of the connecting hole (12241) and the inner wall of the shaft hole (1221).

8. The transmission arrangement of claim 1, wherein, The intermediate gear (125) and the intermediate shaft (122) are rotationally connected, and the transmission structure further comprises a synchronization sleeve (127), the synchronization sleeve (127) is slidably connected between the intermediate shaft (122) and the intermediate gear (125) in the axial direction of the intermediate shaft (122), the synchronization sleeve (127) and the intermediate shaft (122) are engaged in the circumferential direction of the intermediate shaft (122), and the synchronization sleeve (127) and the intermediate gear (125) are key-connected.

9. An electric drive axle comprising the transmission structure according to any one of claims 1-8, and further comprising: a gearbox (100), the gearbox (100) comprising a housing (110), the housing (110) being provided with the transmission structure and a differential (130) therein, wherein the intermediate shaft (122) is drivingly connected with the differential (130); an axle housing (300), the axle housing (300) being connected with an axle housing connecting surface (111b) on the gearbox (100), and a part of the housing (110) for accommodating the differential (130) being located inside the axle housing (300); an axial flux motor (200), the axial flux motor (200) being connected with a motor connecting surface (111a) on the gearbox (100).

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