Multi-gear electric drive axle assembly structure

Abstract

The utility model discloses a multi-gear electric drive axle assembly structure, which effectively utilizes the spaces on the two sides of an axle assembly, improves the overall reliability of an electric drive axle, and enables a lubricating structure to be simple and the lubricating reliability to be high. The axle assembly comprises an axle sub-assembly; the auxiliary box gearbox comprises an auxiliary box shell, an auxiliary box rear cover, an auxiliary box oil pipe and an auxiliary box gear shaft assembly. An auxiliary box motor; the main box gearbox comprises a main box shell, a main box gear shaft assembly, a main box rear cover, an oil pump, a main box upper oil pipe and a main box lower oil pipe. A main box motor; and an inter-bridge oil pipe. The auxiliary box motor and the auxiliary box gearbox form an auxiliary box sub-assembly, the main box motor and the main box gearbox form a main box sub-assembly, and the main box sub-assembly and the auxiliary box sub-assembly are located on the two sides of the axle sub-assembly respectively. A main box shell of the main box gearbox and an auxiliary box shell of the auxiliary box gearbox are fixedly connected to the positions, corresponding to shell bodies on the two sides of a differential mechanism gear, of the axle subassembly through bolts respectively, and a main box external oil way connector is arranged on the main box rear cover.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric drive axle structure, concretely is a kind of multi-gear electric drive axle assembly structure. BACKGROUND

[0002] Integration and high efficiency are the inevitable trend of the development of automobile electric drive system, and the electric drive axle structure cancels the transmission shaft and spiral umbrella tooth, effectively reduces the volume of drive train, improves the transmission efficiency, and is one of the most promising development directions of new energy assembly of commercial vehicle.

[0003] However, the existing electric drive axle assembly has main box gearbox and auxiliary box gearbox, which is generally arranged on one side of the axle assembly, and each gearbox has an independent oil pump, so that each gearbox needs an independent oil pump, and since the oil pump needs to match the rotation direction of the differential gear, the two gearboxes need to be matched with the oil pump assembly structure, and the rear cover of the gearbox needs to be matched with the lubricating oil oil circuit, so that the whole electric drive axle assembly occupies a large volume;And since the two gearboxes are located on one side of the axle assembly, the uneven distribution of the mass of the whole electric axle will adversely affect the suspension strength;Therefore, a new multi-gear electric drive axle assembly structure is urgently needed. UTILITY MODEL CONTENTS

[0004] To solve the above problems, the utility model provides a kind of multi-gear electric drive axle assembly structure, which effectively utilizes the space on both sides of axle assembly, improves the reliability of electric drive axle as a whole, and makes the lubricating structure simple and reliable.

[0005] A kind of multi-gear electric drive axle assembly structure, characterized in that it comprises:

[0006] axle assembly;

[0007] auxiliary gearbox, comprising auxiliary box shell, auxiliary box rear cover, auxiliary box oil pipe, auxiliary box gear shaft assembly;

[0008] auxiliary motor;

[0009] main gearbox, comprising main box shell, main box gear shaft assembly, main box rear cover, oil pump, main box upper oil pipe, main box lower oil pipe;

[0010] main motor;

[0011] and bridge oil pipe;

[0012] The auxiliary box motor and the auxiliary box transmission constitute an auxiliary box subassembly, the main box motor and the main box transmission constitute a main box subassembly, the main box subassembly and the auxiliary box subassembly are respectively located on both sides of the axle subassembly, the main box shell of the main box transmission and the auxiliary box shell of the auxiliary box transmission are respectively fixed to the both sides shell positions corresponding to the differential gear of the axle subassembly through bolts, the main box rear cover is provided with a main box external oil circuit interface, the auxiliary box shell is provided with an auxiliary box shell oil inlet, the inter-axle oil pipe connects the main box external oil circuit interface and the auxiliary box shell oil inlet, the bottom of the cavity of the main box transmission is provided with an oil filter, the oil pump pumps lubricating oil to the oil filter for lubrication, the oil pump pumps lubricating oil into the main box transmission for lubrication, the oil pump pumps lubricating oil into the auxiliary box transmission through the inter-axle oil pipe for lubrication, the cavities of the auxiliary box transmission, the differential gear cavity of the axle subassembly and the bottom of the cavity of the main box transmission are communicated to form a lubricating oil return area, and the oil filter is located in the inner cavity area of the main box transmission in the lubricating oil return area.

[0013] It is further characterized in that:

[0014] The interface between the oil pump and the main box rear cover is designed to be central symmetric, the differential gear is matched with the 0-degree oil pump and the 180-degree oil pump in positive rotation and reverse rotation, the oil pump has two working positions of 0-degree position and 180-degree position, the oil pump switches positions when the gear is reversed, so that the oil suction port and the oil outlet port of the oil pump are exchanged, through the central symmetric oil pump and the rear cover interface structure, the oil pump is rotated by 180 degrees when the gear is reversed, which is equivalent to that the differential gear is matched with the 0-degree oil pump in positive rotation, and the differential gear is matched with the 180-degree oil pump in reverse rotation, so as to meet the oil pumping demand in the front and rear driving directions of the electric drive axle;

[0015] The top of the main box rear cover is provided with a main box external oil circuit interface, the main box rear cover is further provided with a main box rear cover upper oil pipe oil inlet and a main box rear cover bearing lubricating oil channel, lubricating oil is filtered through the oil filter, reaches the main box rear cover oil inlet oil channel, enters the oil pump oil inlet, reaches the oil pump, is pumped out through the oil pump oil outlet, is branched to the main box rear cover upper oil pipe oil channel and the main box rear cover lower oil pipe oil channel, the main box rear cover lower oil pipe oil channel is connected with the main box rear cover lower oil pipe oil hole, lubricating oil enters the main box lower oil pipe, the main box rear cover upper oil pipe oil channel is branched to the main box external oil circuit interface, the main box rear cover upper oil pipe oil inlet and the main box rear cover bearing lubricating oil channel, the main box external oil circuit interface is connected with the inter-axle oil pipe, so that lubricating oil reaches the auxiliary box transmission, the main box rear cover upper oil pipe oil inlet is connected with the main box upper oil pipe, so that lubricating oil reaches the main box shell upper oil pipe oil inlet, the main box rear cover bearing lubricating oil channel is connected with the main box input shaft bearing chamber, then reaches the main box rear cover intermediate shaft bearing chamber and the main box rear cover output shaft bearing chamber through the main box rear cover intermediate shaft oil channel, and the main box rear cover output shaft bearing chamber is lubricated by the splashing lubricating oil and the main box output shaft inner oil channel.

[0016] The lubricating oil reaching the main case oil inlet of the main case oil pipe enters the main case input shaft bearing chamber through the main case input shaft oil channel, and then enters the main case intermediate shaft bearing chamber through the main case intermediate shaft oil channel;

[0017] The lubricating oil of the main case lower oil pipe is connected to the main case lower oil pipe inlet, enters the main case output shaft oil outlet through the main case output shaft oil channel, and then enters the main case output shaft oil outlet;

[0018] The lubricating oil reaches the main case output shaft oil outlet, lubricates the main case output shaft bearing through the movement gap, and reaches the main case output shaft inner oil channel; the lubricating oil entering the main case output shaft inner oil channel lubricates the needle bearing through the main case output shaft radial oil hole, and lubricates the main case rear cover output shaft bearing through the main case output shaft axial oil hole;

[0019] The lubricating oil from the inter-bridge oil pipe reaches the auxiliary case oil inlet through the auxiliary case oil inlet channel, and then reaches the auxiliary case oil pipe inlet after being branched; one branch is connected to the auxiliary case oil pipe, and the other branch reaches the auxiliary case input shaft bearing chamber to lubricate the auxiliary case input shaft bearing, and then reaches the main case output shaft bearing chamber through the auxiliary case output shaft oil inlet channel to lubricate the output shaft bearing;

[0020] For a relatively closed electric drive axle gearbox case, the bottom of the auxiliary case is also provided with a drain hole to allow the lubricating oil to return to the axle bag smoothly;

[0021] The auxiliary case oil pipe is connected to the auxiliary case rear cover oil inlet, the lubricating oil enters the auxiliary case rear cover input shaft bearing chamber to lubricate the auxiliary case rear cover input shaft bearing, and then enters the auxiliary case rear cover output shaft chamber through the auxiliary case rear cover output shaft oil inlet channel to lubricate the auxiliary case rear cover output shaft bearing.

[0022] The utility model discloses a structure, vice box motor and vice box gearbox form vice box subassembly, main tank motor and main tank gearbox form main tank subassembly, and main tank subassembly and vice box subassembly are located at the both sides of bridge subassembly respectively, effectively utilize the both sides space of bridge assembly, can make the quality distribution of bridge both sides even -handed, the suspension design of whole vehicle chassis is convenient, avoids the adverse effect of the uneven quality distribution of whole electric drive axle to the suspension strength, and differential gear and both sides gear are engaged, and the stress direction of both ends is obtuse angle, and the stress of differential gear in operation can be borne by both end gears simultaneously, and the stress direction of both end obtuse angle can further reduce the stress of both end bearings of differential gear, and differential gear bearing is the last bearing, bears the maximum load, is the bearing that is easiest to fail, and the utility model discloses a structure can reduce the bearing of differential gear bearing to the maximum extent, improves the reliability of electric drive axle as a whole, besides, only sets up oil pump in main tank gearbox, and the inter-bridge oil pipe connects main tank external oil circuit interface and vice box casing oil inlet, and oil pump pumps one way into main tank gearbox and carries out lubrication operation, and oil pump pumps another way through the inter-bridge oil pipe and carries out lubrication operation in vice box gearbox, which only needs to assemble oil pump in main tank gearbox, so that the lubrication structure is simple, and lubrication reliability is high. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the structural schematic diagram of the utility model;

[0024] Figure 2 It is the transmission principle schematic diagram of the utility model;

[0025] Figure 3 It is the working principle diagram of oil pump in the utility model under 0 degree and 180 degree state;

[0026] Figure 4 It is the perspective view of main tank gearbox of the utility model;

[0027] Figure 5 It is the side view of main tank gearbox of the utility model;

[0028] Figure 6 It is the oil circuit arrangement schematic diagram of main tank rear cover of main tank gearbox of the utility model;

[0029] Figure 7 It is the oil circuit arrangement schematic diagram of main tank casing of main tank gearbox of the utility model;

[0030] Figure 8 It is the arrangement schematic diagram of axle internal oil circuit of main tank gearbox of the utility model;

[0031] Figure 9 It is the perspective view of vice tank gearbox of the utility model Figure 1 ;

[0032] Figure 10 The utility model discloses a three -dimensional of auxiliary gearbox of auxiliary gearbox Figure 2

[0033] Figure 11 The utility model discloses an oil path arrangement schematic drawing of the auxiliary gearbox shell of auxiliary gearbox of auxiliary gearbox

[0034] Figure 12 The utility model discloses an oil path arrangement schematic drawing of the auxiliary gearbox rear cover of auxiliary gearbox of auxiliary gearbox. DETAILED DESCRIPTION

[0035] A kind of multi-gear electric drive axle assembly structure, see Figures 1-12 It includes bridge subassembly 4, auxiliary gearbox 2, auxiliary gearbox motor 1, main gearbox 6, main gearbox motor 5 and inter-axle oil pipe 3;

[0036] Auxiliary gearbox 2 includes auxiliary gearbox shell 2.1, auxiliary gearbox rear cover 2.2, auxiliary gearbox oil pipe 2.3, auxiliary gearbox gear shaft assembly 2.4;

[0037] Main gearbox 6 includes main gearbox shell 6.1, main gearbox gear shaft assembly 6.2, main gearbox rear cover 6.3, oil pump 6.4, main gearbox upper oil pipe 6.5 and main gearbox lower oil pipe 6.6;

[0038] Auxiliary gearbox motor 1 and auxiliary gearbox 2 form auxiliary gearbox subassembly, main gearbox motor 5 and main gearbox 6 form main gearbox subassembly, and main gearbox subassembly and auxiliary gearbox subassembly are located at the two sides of bridge subassembly 4 respectively, main gearbox shell 6.1 of main gearbox 6 and auxiliary gearbox shell 2.1 of auxiliary gearbox 2 are bolted to the both sides shell position corresponding to differential gear of bridge subassembly 4 respectively, main gearbox rear cover 6.3 is provided with main gearbox external oil path interface 6.3.1, auxiliary gearbox shell 2.1 is provided with auxiliary gearbox shell oil inlet 2.1.1, inter-axle oil pipe 3 connects main gearbox external oil path interface 6.3.1 and auxiliary gearbox shell oil inlet 2.1.1, and the bottom of the cavity of main gearbox 6 is provided with oil filter, oil pump 6.4 is indirectly connected with oil filter to carry out pump lubricating oil operation, one way of oil pump 6.4 is pumped into main gearbox 6 to carry out lubricating operation, another way of oil pump 6.4 is pumped into auxiliary gearbox 2 through inter-axle oil pipe 3 to carry out lubricating operation, the bottom of the cavity of auxiliary gearbox 2, differential gear cavity of bridge subassembly 4 and the cavity of main gearbox 6 are communicated to form the backflow area of lubricating oil, and oil filter (not shown in the drawing, belonging to the mature structure of the prior art) is located in the inner cavity area of main gearbox 6 in the backflow area.

[0039] ​In specific implementation, the interface of the oil pump 6.4 and the rear cover 6.3 of the main box is designed to be central symmetric, the differential gear is matched with the oil pump 6.4 at 0-degree position and 180-degree position when the gear is reversed, the oil pump 6.4 has two working positions at 0-degree position and 180-degree position, the oil pump 6.4 is switched in rotation when the gear is reversed, so that the oil suction port and the oil outlet port of the oil pump 6.4 are exchanged, through the central symmetric interface structure of the oil pump 6.4 and the rear cover, the oil pump 6.4 is assembled at a position rotated by 180 degrees when the gear is reversed, which is equivalent to that the differential gear is matched with the oil pump 6.4 assembled at 0-degree position, and the differential gear is matched with the oil pump 6.4 assembled at 180-degree position, so as to meet the oil pumping demand in the front and rear driving directions of the electric drive axle.

[0040] In specific implementation, the lubrication of the oil circuit is as follows: the top of the rear cover 6.3 of the main box is provided with an external oil circuit interface 6.3.1 of the main box, lubricating oil is filtered through an oil filter, reaches an oil inlet oil channel 6.3.10 of the rear cover of the main box, enters an oil inlet port 6.3.11 of the oil pump, reaches the oil pump 6.4, is pumped out through an oil outlet port 6.3.12 of the oil pump, and is branched to an upper oil pipe oil channel 6.3.13 of the rear cover of the main box and a lower oil pipe oil channel 6.3.7 of the rear cover of the main box; the lower oil pipe oil channel 6.3.7 of the rear cover of the main box is connected with a lower oil pipe oil hole 6.3.8 of the rear cover of the main box, lubricating oil enters a lower oil pipe 6.6 of the main box; the upper oil pipe oil channel 6.3.13 of the rear cover of the main box is branched to the external oil circuit interface 6.3.1 of the main box, an upper oil pipe inlet port 6.3.2 of the rear cover of the main box, a bearing lubricating oil channel 6.3.3 of the rear cover of the main box;

[0041] The external oil circuit interface 6.3.1 of the main box is connected with an inter-axle oil pipe 3, so that lubricating oil reaches a sub-box transmission 2; the upper oil pipe inlet port 6.3.2 of the rear cover of the main box is connected with an upper oil pipe 6.5 of the main box, so that lubricating oil reaches an upper oil pipe inlet port 6.1.1 of a main box shell;

[0042] The bearing lubricating oil channel 6.3.3 of the rear cover of the main box is connected with an input shaft bearing chamber 6.3.4 of the main box, then reaches an intermediate shaft bearing chamber 6.3.6 of the rear cover of the main box through an intermediate shaft oil channel 6.3.5 of the rear cover of the main box;

[0043] An output shaft bearing chamber 6.3.9 of the rear cover of the main box is lubricated by lubricating oil splashed and flowed from the above and an output shaft inner oil channel of the main box;

[0044] Lubricating oil reaching the upper oil pipe inlet port 6.1.1 of the main box shell enters an input shaft bearing chamber 6.1.3 of the main box shell through an input shaft oil channel 6.1.2 of the main box shell, then enters an intermediate shaft bearing chamber 6.1.5 of the main box shell through an intermediate shaft oil channel 6.1.4 of the main box shell;

[0045] Lubricating oil of the lower oil pipe 6.6 of the main box is connected with a lower oil pipe inlet port 6.1.7 of the main box shell, enters an output shaft oil channel 6.1.8 of the main box shell, and then enters an output shaft oil outlet port 6.1.9 of the main box, so as to lubricate an output shaft bearing chamber 6.1.6 of the main box shell.

[0046] The lubricating oil is output from the main case output shaft oil outlet 6.1.9, one way lubricates the main case output shaft bearing 6.2.1 through the motion gap, and the other way reaches the main case output shaft inner oil channel 6.2.2; the lubricating oil entering the main case output shaft inner oil channel 6.2.2, one way lubricates the needle bearing through the main case output shaft radial oil hole 6.2.5, and the other way lubricates the main case rear cover output shaft bearing 6.2.4 through the main case output shaft axial oil hole 6.2.3;

[0047] The lubricating oil from the inter-axle oil pipe 3, after passing through the auxiliary case housing oil inlet 2.1.1, the auxiliary case housing oil inlet channel 2.1.2, and the auxiliary case oil pipe oil inlet 2.1.3, is branched, one way connects the auxiliary case oil pipe 2.3, and the other way lubricates the auxiliary case housing input shaft bearing, reaches the main case housing output shaft bearing chamber 2.1.6 through the auxiliary case housing output shaft oil inlet channel 2.1.5, and lubricates the output shaft bearing;

[0048] For a relatively closed electric drive axle gearbox housing, the bottom of the auxiliary case housing 2.1 is also provided with a drain hole 2.1.7, which allows the lubricating oil to return to the axle bag smoothly;

[0049] The auxiliary case oil pipe 2.3 connects the auxiliary case rear cover oil inlet 2.2.1, the lubricating oil enters the auxiliary case rear cover input shaft bearing chamber 2.2.2, lubricates the auxiliary case rear cover input shaft bearing, and then enters the auxiliary case rear cover output shaft chamber 2.2.4 through the auxiliary case rear cover output shaft oil inlet channel 2.2.3, and lubricates the auxiliary case rear cover output shaft bearing.

[0050] The auxiliary gearbox motor and the auxiliary gearbox constitute an auxiliary gearbox subassembly, the main gearbox motor and the main gearbox constitute a main gearbox subassembly, and the main gearbox subassembly and the auxiliary gearbox subassembly are respectively located on the two sides of the axle subassembly, effectively utilizing the space on the two sides of the axle subassembly, and simultaneously making the mass distribution on the two sides of the axle uniform, facilitating the suspension design of the vehicle chassis, and avoiding the adverse effects of uneven mass distribution of the entire electric axle on the suspension strength; the differential gear meshes with the gears on the two sides, and the force directions at the two ends are obtuse angles, so that the force on the differential gear during operation is simultaneously borne by the gears at the two ends, and the force directions at the two ends further reduce the force on the bearings at the two ends of the differential gear, which are the last bearings and bear the largest load, and are the bearings most prone to failure, so that the present structure can reduce the load on the differential gear bearings to the greatest extent and improve the reliability of the entire electric axle; in addition, the oil pump is arranged only in the main gearbox, the inter-axle oil pipe connects the main gearbox external oil path interface and the auxiliary gearbox shell oil inlet, the oil pump pumps one way of oil into the main gearbox for lubrication, and the oil pump pumps another way of oil into the auxiliary gearbox through the inter-axle oil pipe for lubrication, which makes it necessary to assemble only the oil pump in the main gearbox, makes the lubrication structure simple, and makes the lubrication reliability high; the oil pump meets the demand of bidirectional oil pumping through the self-adapting rotor rotating direction and the rotating assembly mode, to meet the bidirectional arrangement demand of the axle assembly, without the need to develop multiple housings, with high compatibility, low cost, and easy differentiation; and the bottom is provided with an oil filter, the lubrication cleanliness is high, the poor cleanliness of the axle housing is overcome, and the adverse effects of the poor cleanliness of the axle housing on the gear bearings of the gearbox are reduced.

[0051] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being indicated by the appended claims rather than by the foregoing description, and it is intended to encompass all changes falling within the meaning and scope of equivalents of the claims. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0052] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A multi-speed electric drive bridge assembly structure, characterized in that, It includes: Bridge assembly; A secondary gearbox includes a secondary gearbox housing, a secondary gearbox rear cover, a secondary gearbox oil pipe, and a secondary gearbox gear shaft assembly; Auxiliary motor; The main gearbox includes a main gearbox housing, a main gearbox gear shaft assembly, a main gearbox rear cover, an oil pump, an upper oil pipe for the main gearbox, and a lower oil pipe for the main gearbox. Main unit motor; And the inter-bridge oil pipeline; The auxiliary gearbox motor and auxiliary gearbox form an auxiliary gearbox sub-assembly, and the main gearbox motor and main gearbox form a main gearbox sub-assembly. The main gearbox sub-assembly and auxiliary gearbox sub-assembly are located on both sides of the axle sub-assembly. The main gearbox housing of the main gearbox and the auxiliary gearbox housing of the auxiliary gearbox are respectively bolted to the two housings of the axle sub-assembly corresponding to the differential gears. The main gearbox rear cover is provided with an external oil circuit interface, and the auxiliary gearbox housing is provided with an auxiliary gearbox housing oil inlet. The inter-axle oil pipe is connected to the external oil circuit interface of the main gearbox. The main gearbox has an oil inlet and an auxiliary gearbox housing. An oil filter is installed at the bottom of the main gearbox housing. The oil pump is indirectly connected to the oil filter to pump lubricating oil. The oil pump pumps one oil path into the main gearbox for lubrication, and another oil path is pumped into the auxiliary gearbox through the inter-axle oil pipe for lubrication. The bottom of the auxiliary gearbox housing, the differential gear housing of the axle sub-assembly, and the main gearbox housing are connected to form a lubricating oil return flow area. The oil filter is located in the inner cavity area of ​​the main gearbox in the return flow area.

2. The multi-speed electric drive bridge assembly structure according to claim 1, characterized in that: The interface between the oil pump and the main housing rear cover is designed to be centrally symmetrical. The differential gear rotates forward and backward to match the 0-degree oil pump and the 180-degree oil pump. The oil pump has two working positions: 0-degree and 180-degree. When the gear rotates backward, the oil pump rotates to switch positions, so that the oil pump's suction port and oil outlet are interchanged. Through the centrally symmetrical interface structure of the oil pump and the rear cover, when the gear rotates backward, it rotates 180 degrees to match the oil pump assembly position. This is equivalent to the differential gear rotating forward to match the 0-degree oil pump assembly, and the differential gear rotating backward to match the 180-degree oil pump assembly.

3. The multi-speed electric drive bridge assembly structure according to claim 2, characterized in that: The top of the main box rear cover is provided with an external oil circuit interface for the main box. The main box rear cover is also provided with an oil pipe inlet on the main box rear cover and a bearing lubrication oil passage on the main box rear cover. The lubricating oil is filtered by an oil filter, reaches the oil inlet passage on the main box rear cover, enters the oil pump inlet and reaches the oil pump, and is then pumped out through the oil pump outlet, and distributed to the oil pipe passage on the main box rear cover and the oil pipe passage on the lower part of the main box rear cover. The oil pipe and oil passage under the main gearbox rear cover connect to the oil hole of the oil pipe under the main gearbox rear cover, allowing lubricating oil to enter the lower oil pipe of the main gearbox. The oil pipe and oil passage on the main gearbox rear cover branch to the external oil circuit interface of the main gearbox, the oil inlet of the oil pipe on the main gearbox rear cover, and the lubricating oil passage of the bearings on the main gearbox rear cover. The external oil circuit interface of the main gearbox connects to the inter-axle oil pipe, allowing lubricating oil to reach the auxiliary gearbox. The oil inlet of the oil pipe on the main gearbox rear cover connects to the upper oil pipe of the main gearbox, allowing lubricating oil to reach the oil inlet of the upper oil pipe on the main gearbox housing. The lubricating oil passage of the bearings on the main gearbox rear cover connects to the input shaft bearing chamber of the main gearbox, and then reaches the intermediate shaft bearing chamber of the main gearbox rear cover via the intermediate shaft oil passage of the main gearbox rear cover. The output shaft bearing chamber of the main gearbox rear cover is lubricated by the lubricating oil splashed down from the above and the oil passage inside the shaft of the main gearbox output shaft.

4. The multi-speed electric drive bridge assembly structure according to claim 3, characterized in that: The lubricating oil that reaches the oil inlet of the oil pipe on the main housing enters the main housing input shaft bearing chamber through the main housing input shaft oil passage, and then enters the main housing intermediate shaft bearing chamber through the main housing intermediate shaft oil passage.

5. The multi-speed electric drive bridge assembly structure according to claim 4, characterized in that: The lubricating oil in the lower oil pipe of the main gearbox is connected to the oil inlet of the lower oil pipe of the main gearbox housing, passes through the oil passage of the output shaft of the main gearbox housing, and enters the oil outlet of the output shaft of the main gearbox.

6. The multi-speed electric drive bridge assembly structure according to claim 5, characterized in that: The lubricating oil passes through the oil outlet of the main gearbox output shaft, one path lubricates the main gearbox housing output shaft bearing through the movement clearance, and the other path reaches the oil passage inside the main gearbox output shaft; the lubricating oil entering the oil passage inside the main gearbox output shaft lubricates the needle roller bearing through the radial oil hole of the main gearbox output shaft, and the other path lubricates the main gearbox rear cover output shaft bearing through the axial oil hole of the main gearbox output shaft.

7. The multi-speed electric drive bridge assembly structure according to claim 6, characterized in that: The lubricating oil from the inter-bridge oil pipe passes through the oil inlet of the auxiliary housing and the oil inlet passage of the auxiliary housing. After reaching the oil inlet of the auxiliary housing oil pipe, it is split. One path connects to the auxiliary housing oil pipe, and the other path goes to the input shaft bearing chamber of the auxiliary housing to lubricate the input shaft bearing of the auxiliary housing. Then, it goes through the output shaft oil inlet passage of the auxiliary housing to reach the output shaft bearing chamber of the main housing to lubricate the output shaft bearing.

8. The multi-speed electric drive bridge assembly structure according to claim 7, characterized in that: For the relatively enclosed electric drive axle gearbox housing, the bottom of the auxiliary housing is also provided with an oil drain hole, which allows the active lubricating oil to smoothly return to the axle housing.

9. The multi-speed electric drive bridge assembly structure according to claim 7, characterized in that: The auxiliary gearbox oil pipe is connected to the oil inlet of the auxiliary gearbox rear cover. The lubricating oil enters the input shaft bearing chamber of the auxiliary gearbox rear cover to lubricate the input shaft bearing of the auxiliary gearbox rear cover, and then enters the output shaft chamber of the auxiliary gearbox rear cover through the oil inlet passage of the output shaft of the auxiliary gearbox rear cover to lubricate the output shaft bearing of the auxiliary gearbox rear cover.

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