Electric drive axle housing with motor water cooling structure

Abstract

An electric drive axle housing with a motor water cooling structure comprises an electric drive axle housing body which is integrally formed in a die-casting mode, the electric drive axle housing body comprises a drive motor installation part, a speed reducer installation part and a differential mechanism installation part, the drive motor installation part comprises an outer shell body and an inner shell body, and a spiral water channel groove is formed in the outer circumference of the inner shell body. The inner shell is in interference fit in the outer shell to form a motor mounting cavity used for mounting a driving motor, one side of the outer shell is axially opened and provided with a mounting flange used for being connected with a motor controller, the speed reducer mounting part is located on the other side of the outer shell, and a main speed reducer mounting cavity is formed in the speed reducer mounting part. The main speed reducer mounting cavity is communicated with the motor mounting cavity through a shaft hole, the main speed reducer mounting cavity is sealed by an end cover, a differential mechanism mounting part is arranged on the rear side of the speed reducer mounting part, and a differential mechanism mounting cavity and half shaft sleeve mounting cavities on the two sides of the differential mechanism mounting cavity are formed in the differential mechanism mounting part.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electric automobile, concretely relates to an electric drive axle housing with motor water cooling structure. BACKGROUND

[0002] With the rapid development of new energy automobile industry, as the core component of power assembly, the integration and lightweight design of electric drive axle have become an important direction of industry technological innovation. The traditional electric drive axle housing adopts split type casting structure, and the motor, reducer and other components need to be installed separately and connected with the cooling system through pipeline, which has problems such as complex structure, many assembly processes and low cooling efficiency. Especially in high power density electric drive system, the heat generated by the motor stator and the controller is difficult to be effectively discharged through the traditional heat dissipation mode, which leads to the accumulation of system thermal load and affects the working reliability of the drive system.

[0003] For example, the electric drive axle assembly with longitudinal motor arrangement in CN210881653U has the following technical problems: first, the system needs to be connected through bolts to realize the mutual fixation between the axle housing, the main reducer housing and the drive motor housing, which leads to the complication of assembly process, and after long-term use, the sealing performance between the axle housing and the main reducer housing is reduced due to the bending stress of the axle housing; second, as the core power unit, the temperature rise level of the drive motor directly affects the key performance indicators such as operating efficiency and output power, and the lack of efficient and reliable motor cooling system will lead to the irreversible demagnetization of permanent magnet synchronous motor under high temperature working condition, and further cause permanent performance degradation problems such as output torque attenuation and power drop. SUMMARY

[0004] The utility model aims at the corresponding deficiency of prior art, provides an electric drive axle housing including drive motor installation part, reducer installation part, differential installation part, through the integrated installation flange for connecting motor controller, drive motor installation part includes the integrated motor cooling water channel between outer shell and inner shell, realizes high integration and efficient cooling.

[0005] The utility model aims at the following scheme:

[0006] The utility model relates to an electric drive axle housing with motor water cooling structure, including integrative pressure casting electric drive axle housing, the electric drive axle housing includes drive motor installation department, speed reducer installation department, differential installation department, the drive motor installation department includes outer casing, inner casing, the outer circle of inner casing is equipped with spiral water channel groove, and the inner casing is in the outer casing and is formed motor installation chamber with interference fit, is used for installing drive motor, the outer casing one side axial opening and is equipped with installation flange, the installation flange is used for connecting motor controller, the speed reducer installation department is located the other side of outer casing, and the speed reducer installation department is provided with main speed reducer installation chamber in, and main speed reducer installation chamber is communicated with motor installation chamber through shaft hole, and main speed reducer installation chamber is closed with end cover, the speed reducer installation department rear side is equipped with differential installation department, and the differential installation department is provided with differential installation chamber and the half shaft sleeve installation chamber of differential installation chamber both sides in the differential installation department,

[0007] The drive motor installation chamber side wall is provided with a water inlet and a water outlet, and the water inlet and the water outlet are communicated with the water channel groove to form a closed cooling water channel.

[0008] Preferably, one end of the inner casing abuts against a stopper provided in the drive motor installation chamber, and the other end is provided with a mounting flange extending radially outward, and the mounting flange is fixed on a positioning step provided on the opening side of the drive motor installation chamber by bolts.

[0009] Preferably, annular grooves are provided on the outer periphery of the two axial ends of the inner casing, and O-shaped sealing rings are provided in the annular grooves to prevent the cooling liquid from seeping into the drive motor installation chamber.

[0010] Preferably, the water inlet is communicated with a water inlet connector extending radially outward on the outside of the drive motor installation chamber, and the water outlet is communicated with a water outlet pipe extending axially outward from the drive motor installation chamber to the motor controller.

[0011] Preferably, a partition wall is provided between the main speed reducer installation chamber and the motor installation chamber, and a shaft hole is provided on the partition wall and integrally pressure cast with the electric drive axle housing.

[0012] Preferably, a partition plate is fixed on the outside of the mounting flange by bolts, and the partition plate seals the inner casing.

[0013] Preferably, a bearing seat for supporting the rotor shaft of the drive motor is provided in the shaft hole.

[0014] The utility model has the advantages of:

[0015] 1. High integration design: by one-piece die-casting electric drive axle housing, the drive motor mounting part, the reducer mounting part, the differential mounting part and the cooling system are integrated in a single housing structure, which significantly reduces the assembly parts and connection interfaces of the traditional split axle housing, simplifies the assembly process and reduces the overall weight. At the same time, the integrated structure avoids the risk of sealing failure caused by split connection, improves the overall rigidity and carrying capacity of the axle housing, and the integrated mounting flange facilitates the installation of the motor controller.

[0016] 2. High cooling performance: the spiral water channel groove on the outer circumference of the inner housing is in interference fit with the outer housing to form a closed cooling water channel, which increases the contact area of the cooling liquid and the motor mounting cavity, realizes uniform heat dissipation of the stator of the drive motor, effectively reduces the motor temperature rise, avoids the risk of permanent magnet demagnetization, and ensures the output stability under high power density conditions.

[0017] 3. High sealing reliability: the two ends of the inner housing are in radial sealing with the outer housing through O-shaped sealing rings, and the bolt fixing structure of the mounting flange and the positioning step prevents the cooling liquid from entering the motor mounting cavity, ensuring that the cooling system and the motor operating environment are completely isolated.

[0018] 4. Process simplification and cost reduction: integrated design reduces the machining and welding process of traditional split axle housing, reducing manufacturing cost; spiral water channel groove, partition wall and other complex structures are directly formed by mold, improving production efficiency.

[0019] The utility model discloses through structure integration, cooling system optimization and sealing reinforcement design, solve the traditional electric drive axle housing because split structure leads to the problem such as assembly complex, low heat dissipation efficiency, poor sealing, especially suitable for new energy automobile high power density electric drive system, has the comprehensive advantage such as lightweight, high-efficiency heat dissipation, reliable operation, cost control. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structure schematic drawing of the utility model;

[0021] Figure 2 It is the structure schematic drawing of the utility model in inner housing;

[0022] Figure 3 It is the structure schematic drawing of one side of the utility model;

[0023] Figure 4 It is the structure schematic drawing of the other side of the utility model;

[0024] Figure 5 It is the assembly schematic drawing of one side of the utility model;

[0025] Figure 6 It is the assembly schematic drawing of the other side of the utility model;

[0026] In the figure: electric drive axle housing (1), outer housing (2), inner housing (3), spiral water channel groove (4), motor mounting cavity (5), mounting flange (6), motor controller (7), main reducer mounting cavity (8), shaft hole (9), end cover (10), differential mounting cavity (11), half shaft sleeve mounting cavity (12), stop opening (15), mounting flange (16), positioning step (17), O-ring (19), water inlet connector (20), water outlet pipe (21), partition wall (22), partition plate (23). DETAILED DESCRIPTION

[0027] As Figures 1 to 6As shown, an electric drive axle housing with motor water cooling structure, comprising an integral die-cast electric drive axle housing 1, the electric drive axle housing 1 comprising a drive motor mounting portion, a reducer mounting portion, a differential mounting portion, the drive motor mounting portion comprising an outer shell 2, an inner shell 3, the outer circumference of the inner shell 3 is provided with a spiral water channel groove 4, the inner shell 3 is interference fitted in the outer shell 2 to form a motor mounting cavity 5, for mounting a drive motor, the water channel groove 4 and the outer shell 2 form a closed circulation water channel, one end of the inner shell 3 abuts against a stop 15 provided in the drive motor mounting cavity 5, the other end is provided with a radially outwardly extending mounting flange 16, the mounting flange 16 is fixed on a positioning step 17 provided on the opening side of the drive motor mounting cavity 5 through bolts, the outer side of the mounting flange 16 is fixed with a partition plate 23 through bolts, the partition plate 23 closes the inner shell 3, the outer circumferences of the axial two ends of the inner shell 3 are respectively provided with annular grooves, O-shaped sealing rings 19 are arranged in the annular grooves, to prevent the cooling liquid from seeping into the drive motor mounting cavity 5; the outer shell 2 is axially opened on one side and is provided with a mounting flange 6, the mounting flange 6 is used for connecting a motor controller 7, the motor controller 7 comprises a power electronic inverter, the reducer mounting portion is located on the other side of the outer shell 2, a main reducer mounting cavity 8 is arranged in the reducer mounting portion, the main reducer mounting cavity 8 is communicated with the motor mounting cavity 5 through a shaft hole 9, a partition wall 22 is arranged between the main reducer mounting cavity 8 and the motor mounting cavity 5, the partition wall 22 is provided with the shaft hole 9 and is integrally die-cast with the electric drive axle housing 1, a bearing seat for supporting a drive motor rotor shaft is arranged in the shaft hole 9, the rotor shaft of the drive motor extends into the main reducer mounting cavity through the bearing seat and serves as an input shaft of the main reducer, the main reducer mounting cavity 8 is closed by an end cover 10, a differential mounting portion is arranged on the rear side of the reducer mounting portion, a differential mounting cavity 11 and half shaft sleeve mounting cavities 12 on the two sides of the differential mounting cavity 11 are arranged in the differential mounting portion, the differential mounting cavity 11 is arranged in parallel with the drive motor mounting cavity 5 and the main reducer mounting cavity 8, and the differential mounting cavity 11 is a front transverse type drive axle for the drive motor shaft, the rear side of the differential mounting cavity 11 is covered by a rear cover; a water inlet and a water outlet are arranged on the side wall of the drive motor mounting cavity 5, the water inlet and the water outlet are communicated with the water channel groove 4 to form a closed cooling water channel, the water inlet is communicated with a water inlet connector 20 extending radially outward from the outer side of the drive motor mounting cavity 5, and the water outlet is communicated with a water outlet pipe 21 extending axially outward from the outer side of the drive motor mounting cavity 5 to the motor controller 7.

[0028] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and the changes made by the person skilled in the art without departing from the spirit of the present application fall within the protection scope of the present application.

Claims

1. An electric drive axle housing with motor water cooling structure, characterized in that: The application relates to an integrated die-cast electric drive axle housing (1) which comprises a drive motor mounting portion, a speed reducer mounting portion and a differential mounting portion, the drive motor mounting portion comprises an outer shell (2) and an inner shell (3), the outer periphery of the inner shell (3) is provided with a spiral water channel groove (4), the inner shell (3) is in interference fit in the outer shell (2) to form a motor mounting cavity (5) for mounting a drive motor, one side of the outer shell (2) is axially opened and provided with a mounting flange (6), the mounting flange (6) is used for connecting a motor controller (7), the speed reducer mounting portion is located at the other side of the outer shell (2), a main speed reducer mounting cavity (8) is arranged in the speed reducer mounting portion, the main speed reducer mounting cavity (8) is communicated with the motor mounting cavity (5) through a shaft hole (9), the main speed reducer mounting cavity (8) is closed by an end cover (10), the differential mounting portion is arranged at the rear side of the speed reducer mounting portion, a differential mounting cavity (11) and half shaft sleeve mounting cavities (12) arranged at the two sides of the differential mounting cavity (11) are arranged in the differential mounting portion. Water inlets and water outlets are arranged on the side wall of the drive motor mounting cavity (5), the water inlets and the water outlets are communicated with the water channel groove (4) to form a closed cooling water channel.

2. The electric drive axle housing with motor water cooling structure of claim 1, wherein: One end of the inner shell (3) is abutted against a stop (15) arranged in the drive motor mounting cavity (5), the other end is provided with a mounting flange (16) extending radially outward, and the mounting flange (16) is fixed on a positioning step (17) arranged on the opening side of the drive motor mounting cavity (5) through bolts.

3. The electric drive axle housing with motor water cooling structure of claim 1, wherein: Annular grooves are arranged on the outer peripheries of the two axial ends of the inner shell (3), and O-shaped sealing rings (19) are arranged in the annular grooves to prevent the cooling liquid from seeping into the drive motor mounting cavity (5).

4. The electric drive axle housing with motor water cooling structure of claim 1, wherein: The water inlets are communicated with water inlets (20) extending radially outward on the outer side of the drive motor mounting cavity (5), and the water outlets are communicated with water outlets (21) extending axially outward on the outer side of the drive motor mounting cavity (5) to the motor controller (7).

5. The electric drive axle housing with motor water cooling structure of claim 1, wherein: A partition wall (22) is arranged between the main speed reducer mounting cavity (8) and the motor mounting cavity (5), the partition wall (22) is provided with the shaft hole (9) and is integrally die-cast with the electric drive axle housing (1).

6. The electric drive axle housing with water cooling structure of electric motor as claimed in claim 2, characterized in that: A partition plate (23) is fixed on the outer side of the mounting flange (16) through bolts, and the partition plate (23) seals the inner shell (3).

7. The electric drive axle housing with motor water cooling structure of claim 1, wherein: A bearing seat for supporting a rotor shaft of the drive motor is arranged in the shaft hole (9).

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