Electric vehicle drive axle

Abstract

The utility model discloses an electric vehicle drive axle which comprises an electric drive rear axle, an axle housing oil liquid pumping mechanism is arranged on the surface of the top of the electric drive rear axle, a lubricating oil liquid filtering mechanism is arranged on the surface of the bottom of the electric drive rear axle, and the axle housing oil liquid pumping mechanism and the lubricating oil liquid filtering mechanism are connected with each other. According to the technical scheme, the lubricating oil filtering mechanism is arranged at the bottom of the drive axle, the liquid inlet and outlet channel is formed in the sealing end cover, and the filter element is arranged in the filter shell, so that oil in the axle shell can be filtered by the filter element, and when a differential mechanism and a speed reducer in the drive axle run, clean lubricating oil can be obtained; and the effect of protecting a transmission system in the drive axle is achieved. The axle housing oil pumping mechanism is arranged at the top of the drive axle, so that gears of the speed reducer and the differential mechanism are lubricated in advance when the drive axle does not run, and excessive abrasion caused by insufficient lubrication of a gear set due to the fact that cold start oil deposits at the bottom of the axle housing is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle rear axle instrument technical field, concretely relates to a kind of electric vehicle drive axle. BACKGROUND

[0002] The function of electric vehicle drive axle is to transmit the force and torque between the frame and the wheels. The torque of the electric motor is transmitted to the drive wheels through the reducer, differential, half shaft, etc. to reduce the speed and increase the torque. The transmission direction of the torque is changed by the main reducer bevel gear pair. The differential realizes the differential action of the two sides of the wheel, ensuring that the inside and outside wheels turn at different speeds. The speed is reduced and the torque is increased by the main reducer gear transmission. The bridge housing and the wheel realize the load bearing and force transmission. Due to the presence of differential, reducer and other transmission systems inside the drive axle, and the transmission between them by gear set, the drive axle is usually filled with lubricating oil. The inventor found that due to the lack of a corresponding lubricating oil filtration system in the drive axle, oil sludge is more likely to appear inside the drive axle. When the vehicle is not started, the oil inside the drive axle will settle at the bottom due to gravity, causing the upper part of the transmission gear set to not be lubricated in time after the drive axle is running, and there is a risk of excessive wear. SUMMARY

[0003] The purpose of the utility model is to provide a technical solution for electric vehicle drive axle to solve the problems mentioned in the background art. To solve the drawbacks and defects mentioned in the background art, the technical solution has the following contents:

[0004] It comprises an electric drive rear axle, a bridge housing oil pump-in mechanism is provided on the top surface of the electric drive rear axle, a lubricating oil filtration mechanism is provided on the bottom surface of the electric drive rear axle, and the bridge housing oil pump-in mechanism and the lubricating oil filtration mechanism are connected to each other;

[0005] The electric drive rear axle comprises a bridge housing, a drive motor fixedly connected to the left and right ends of the bridge housing, and a transmission half shaft connected to the front side of the bridge housing.

[0006] The bridge housing oil pump-in mechanism comprises a liquid pump fixed on the upper surface of the bridge housing, a liquid suction pipeline connected to the liquid suction port of the liquid pump through a connector, and a liquid discharge pipeline connected to the liquid discharge port of the liquid pump through a connector, and the end of the liquid discharge pipeline away from the liquid pump penetrates into the inner cavity of the bridge housing.

[0007] The lubricating oil filtering mechanism comprises a filter shell, a sealing end cover fixed on the left side port of the filter shell through screwing, and a filter core clamped in the inner cavity of the filter shell, an L-shaped liquid inlet channel penetrating through the inner cavity of the bridge shell is arranged on the upper layer of the inner part of the sealing end cover, a liquid outlet channel connected with the transmission half shaft is arranged on the lower layer of the inner part of the sealing end cover, and the discharge port of the L-shaped liquid inlet channel penetrates into the inner part of the filter core.

[0008] As a preferred scheme of the utility model, one end of the liquid pumping pipeline away from the liquid pumping pump penetrates into the inner part of the bridge shell and is flush with the inner cavity side wall of the bridge shell.

[0009] As a preferred scheme of the utility model, the port of the liquid pumping pipeline in the inner cavity of the liquid pumping pump is located above the differential gear and the speed reducer gear in the inner part of the bridge shell.

[0010] As a preferred scheme of the utility model, the bottom surface of the bridge shell is provided with a liquid inlet nozzle in penetration, and the top port of the L-shaped liquid inlet channel is connected with the bottom end of the liquid inlet nozzle through a joint.

[0011] As a preferred scheme of the utility model, the bottom end of the liquid outlet channel is connected with a liquid outlet nozzle, and one end of the liquid pumping pipeline away from the liquid pumping pump is connected with the bottom end of the liquid outlet nozzle through a joint.

[0012] As a preferred scheme of the utility model, a sealing ring in contact with the end surface of the filter core is fixed on one end of the sealing end cover close to the filter shell.

[0013] As a preferred scheme of the utility model, the outer circle surface of the filter core and the inner cavity side wall of the filter shell have a space for the circulation of lubricating oil, and the port of the liquid outlet channel in the inner part of the sealing end cover penetrates through the space.

[0014] As a preferred scheme of the utility model, a plurality of threads are arranged on the inner cavity side wall of the sealing end cover, and a screw tooth adapted to the thread of the inner cavity of the sealing end cover is arranged on the outer circle surface of the port of the filter shell.

[0015] In the above technical scheme, the utility model provides technical effects and advantages:

[0016] 1. By arranging the lubricating oil filtering mechanism on the bottom of the drive axle, arranging the liquid inlet and outlet channels in the inner part of the sealing end cover, and arranging the filter core in the filter shell, the oil in the inner part of the bridge shell can be forced to be filtered by the filter core, so that the differential gear and the speed reducer in the inner part of the drive axle can obtain relatively clean lubricating oil when running, and the effect of protecting the transmission system in the inner part of the drive axle is achieved.

[0017] 2. The application is characterized in that the oil pump inlet mechanism is arranged on the top of the drive axle, the oil in the filter shell and the bottom of the drive axle cavity is pumped out by the pump and pipeline, the gears of the reducer and differential are lubricated in advance when the drive axle is not running, and the oil deposition in the bottom of the axle housing is avoided to cause insufficient lubrication of the gear set and excessive wear. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0019] Figure 1 It is a schematic diagram of the drive axle structure.

[0020] Figure 2 It is a schematic diagram of the electric drive rear axle.

[0021] Figure 3 It is a schematic diagram of the axle housing oil pump inlet mechanism.

[0022] Figure 4 It is a schematic diagram of the lubricating oil filter mechanism.

[0023] Explanation of reference signs:

[0024] 1. Electric drive rear axle; 11. Axle housing; 12. Drive motor; 13. Transmission half shaft; 2. Axle housing oil pump inlet mechanism; 21. Pump; 22. Drainage pipeline; 23. Pump; 3. Lubricating oil filter mechanism; 31. Filter shell; 32. Filter element; 33. Sealing end cover; 34. L-shaped liquid inlet channel; 35. Liquid inlet nozzle; 36. Liquid outlet channel; 37. Liquid outlet nozzle. DETAILED DESCRIPTION

[0025] In order to make the technical solutions and implementation modes of the present application more clearly explained and described, the following introduces several preferred specific embodiments for realizing the technical solutions of the present application.

[0026] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application and uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or similar elements and features. The various drawings are schematic illustrations only and are not necessarily drawn to scale. In certain instances, particular elements in the figures can be presented using a exaggerated in order to highlight related details or structures of embodiments of the present disclosure. Various publications, patents and published patent specifications referred to herein are hereby incorporated by reference in their entirety. The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application.

[0027] Embodiment, a better technical scheme of an electric vehicle drive axle, comprising the following:

[0028] It comprises an electric drive rear axle 1, the top surface of the electric drive rear axle 1 is provided with a bridge shell oil pump into mechanism 2, the bottom surface of the electric drive rear axle 1 is provided with a lubricating oil filtering mechanism 3, the bridge shell oil pump into mechanism 2 and the lubricating oil filtering mechanism 3 are connected with each other;

[0029] The electric drive rear axle 1 comprises a bridge shell 11, a drive motor 12 fixedly connected to the left and right ends of the bridge shell 11, and a transmission half shaft 13 connected to the front side of the bridge shell 11;

[0030] The bridge shell oil pump into mechanism 2 comprises a liquid pumping pump 21 fixed on the upper surface of the bridge shell 11, a liquid pumping pipeline 23 connected to the liquid pumping port of the liquid pumping pump 21 through a joint, and a liquid discharging pipeline 22 connected to the liquid discharging port of the liquid pumping pump 21 through a joint, and the end of the liquid discharging pipeline 22 away from the liquid pumping pump 21 penetrates into the inner cavity of the bridge shell 11;

[0031] The lubricating oil filtering mechanism 3 comprises a filter shell 31, a sealing end cover 33 fixed on the left side port of the filter shell 31 by screwing, and a filter core 32 clamped in the inner cavity of the filter shell 31, an L-shaped liquid inlet channel 34 penetrating the inner cavity of the bridge shell 11 is arranged on the upper layer of the inside of the sealing end cover 33, a liquid discharging channel 36 connected with the transmission half shaft 13 is arranged on the lower layer of the inside of the sealing end cover 33, and the discharge port of the L-shaped liquid inlet channel 34 penetrates into the inside of the filter core 32.

[0032] The end of the liquid discharging pipeline 22 away from the liquid pumping pump 21 penetrates into the inside of the bridge shell 11 and is flush with the inner cavity side wall of the bridge shell 11. The port of the liquid discharging pipeline 22 in the inner cavity of the liquid pumping pump 21 is located above the differential gear and the speed reducer gear in the inside of the bridge shell 11.

[0033] The bottom surface of the axle housing 11 is provided with a liquid inlet nozzle 35, and the top end port of the L-shaped liquid inlet channel 34 is connected to the bottom end of the liquid inlet nozzle 35 through a joint. The bottom end port of the liquid discharge channel 36 is connected with a liquid discharge nozzle 37, and the end of the liquid suction pipeline 23 away from the liquid suction pump 21 is connected to the bottom end of the liquid discharge nozzle 37 through a joint. The sealing end cover 33 is fixed with a ring of sealing rings in contact with the end face of the filter element 32 near one end of the filter shell 31, and the outer surface of the filter element 32 has a space for the flow of lubricating oil between the inner cavity side wall of the filter shell 31 and the space through which the port of the liquid discharge channel 36 in the sealing end cover 33 is located. A plurality of threads are arranged on the inner cavity side wall of the sealing end cover 33, and the outer surface of the port of the filter shell 31 is provided with screw threads matched with the inner cavity threads of the sealing end cover 33.

[0034] According to the above-mentioned preferred technical solution, the working process of the technical solution is described:

[0035] Before the drive axle is in a running state or cold start, the lubricating oil in the axle housing 11 enters the L-shaped liquid inlet channel 34 through the liquid inlet nozzle 35 due to gravity and the suction force of the liquid suction pump 21. Since the L-shaped liquid inlet channel 34 and the liquid discharge channel 36 are not connected to each other, the oil will enter the filter element 32 along the L-shaped liquid inlet channel 34. Since the liquid discharge channel 36 transmits the suction force of the liquid suction pump 21, and the inside of the liquid discharge channel 36 is connected to the inside of the filter shell 31, the oil will pass through the filter element 32 and penetrate into the filter shell 31 under the influence of the suction force, and finally enter the transmission half shaft 13 through the liquid discharge channel 36 and the liquid discharge nozzle 37. After being filtered by the filter element 32, the debris generated by the mutual wear of the differential and the reducer gears in the axle housing 11 is filtered by the filter element 32, so that the lubricating oil entering the axle housing 11 can remain relatively clean, avoiding the formation of oil sludge in the axle housing 11.

[0036] After the filtered oil is transported into the axle housing 11 by the liquid discharge pipeline 22 and the liquid suction pump 21, the oil sprayed downward lubricates the gear set in multiple directions when the drive axle is in a running state. When the drive axle is not running, the lubricating oil sprayed from top to bottom by the liquid discharge pipeline 22 will lubricate the gear set in advance, preventing the oil in the drive axle from depositing at the bottom due to gravity, which causes the upper part of the gear set to be unable to be lubricated in time.

[0037] The above only describes some exemplary embodiments of the present application by way of illustration, and it is not necessary to modify the described embodiments in various ways without deviating from the spirit and scope of the present application for ordinary skilled in the art. Therefore, the above figures and descriptions are illustrative in nature and should not be construed as limiting the scope of protection claimed by the present application.

Claims

1. An electric drive axle for an electric vehicle, comprising an electric drive rear axle (1), characterized in that: The top surface of the electric drive rear axle (1) is provided with an axle housing oil liquid pumping mechanism (2), and the bottom surface of the electric drive rear axle (1) is provided with a lubricating oil liquid filtering mechanism (3), and the axle housing oil liquid pumping mechanism (2) and the lubricating oil liquid filtering mechanism (3) are connected with each other. The electric drive rear axle (1) comprises an axle housing (11), drive motors (12) fixedly connected to the left and right ends of the axle housing (11), and a transmission half shaft (13) connected to the front side of the axle housing (11). The axle housing oil liquid pumping mechanism (2) comprises a liquid pumping pump (21) fixed to the upper surface of the axle housing (11), a liquid pumping pipeline (23) connected to the liquid pumping port of the liquid pumping pump (21) through a joint, and a liquid discharging pipeline (22) connected to the liquid discharging port of the liquid pumping pump (21) through a joint, and the end of the liquid discharging pipeline (22) away from the liquid pumping pump (21) penetrates into the inner cavity of the axle housing (11). The lubricating oil liquid filtering mechanism (3) comprises a filter housing (31), a sealing end cover (33) fixed to the left side port of the filter housing (31) by screwing, and a filter element (32) clamped in the inner cavity of the filter housing (31), the inside upper layer of the sealing end cover (33) is provided with an L-shaped liquid inlet channel (34) penetrating the inner cavity of the axle housing (11), the inside lower layer of the sealing end cover (33) is provided with a liquid discharging channel (36) connected with the transmission half shaft (13), and the discharge port of the L-shaped liquid inlet channel (34) penetrates into the inside of the filter element (32).

2. The electric vehicle drive axle of claim 1, wherein: The end of the liquid discharging pipeline (22) away from the liquid pumping pump (21) penetrates into the inside of the axle housing (11) and is flush with the inner cavity side wall of the axle housing (11).

3. The electric vehicle drive axle of claim 1, wherein: The port of the liquid discharging pipeline (22) in the inner cavity of the liquid pumping pump (21) is located above the differential gear and the reducer gear in the inside of the axle housing (11).

4. The electric vehicle drive axle of claim 1, wherein: The bottom surface of the axle housing (11) is provided with a liquid inlet nozzle (35), and the top port of the L-shaped liquid inlet channel (34) is connected with the bottom end of the liquid inlet nozzle (35) through a joint.

5. The electric vehicle drive axle of claim 1, wherein: The bottom end of the liquid discharging channel (36) is connected with a liquid discharging nozzle (37), and the end of the liquid pumping pipeline (23) away from the liquid pumping pump (21) is connected with the bottom end of the liquid discharging nozzle (37) through a joint.

6. The electric vehicle drive axle of claim 1, wherein: The end face of the sealing end cover (33) close to the filter housing (31) is fixed with a ring of sealing rings in contact with the end face of the filter element (32).

7. The electric vehicle drive axle of claim 1, wherein: The space for the flow of lubricating oil liquid is formed between the outer surface of the filter element (32) and the inner cavity side wall of the filter housing (31), and the port of the liquid discharging channel (36) in the inside of the sealing end cover (33) is communicated with the space.

8. The electric vehicle drive axle of claim 1, wherein: The inner cavity side wall of the sealing end cover (33) is provided with multiple threads, and the outer surface of the port of the filter housing (31) is provided with screw teeth matched with the threads in the inner cavity of the sealing end cover (33).

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