Shell structure of electric drive assembly, electric drive assembly and electric vehicle

Abstract

The utility model discloses a shell structure of an electric drive assembly, the electric drive assembly and an electric vehicle, the shell structure comprises a front shell and a rear shell of a reduction gearbox, and the front shell is provided with an input shaft hole and an output shaft hole in a penetrating manner; the side, away from the rear shell, of the front shell is provided with a motor shell coaxial with the input shaft hole, and the other end of the motor shell is provided with an end cover. The front shell protrudes outwards along the output shaft hole to form an output shell which is integrally in a conical shape, the output shell is provided with a connecting rib extending towards the motor shell, and the connecting rib is connected to the motor shell. The electric drive assembly shell structure, the electric drive assembly and the electric vehicle have the advantages of being reasonable in structural design, capable of improving the overall strength of the shell, beneficial to prolonging the service life and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, and in particular to a housing structure of an electric drive assembly, an electric drive assembly and an electric vehicle. Background Art

[0002] In recent years, with the continuous development of electric vehicle technology, the integrated design of its electric drive assembly has become a future development trend. The electric drive assembly typically includes an electric motor, a reduction gearbox, and a controller. The electric motor and reduction gearbox are primarily connected through mechanical transmission. To further improve integration, the front cover of the electric motor and the front housing of the reduction gearbox are usually combined into a single-piece common housing. The output shaft of the reduction gearbox and the electric motor are arranged side by side on the common housing. In this structure, the common housing has an overall elliptical shape. When its two ends along the long axis are fixed to the vehicle frame, they will exert tensile stress on the common housing when the vehicle body encounters bumps or vibrations. For small vehicles such as motorcycles, the gear reduction structure inside the reduction gearbox is simple, and the thickness of the common housing is relatively thin. The tensile stress exerted on the common housing during extreme movement is greater, which increases the risk of stress fatigue and cracking or fracture of the common housing in the area between the reduction gearbox output shaft and the electric motor. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a shell structure, an electric drive assembly and an electric vehicle with a reasonable structural design, which can improve the overall strength of the shell and help extend the service life.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A housing structure of an electric drive assembly includes a front housing and a rear housing of a reduction gearbox, wherein the front housing is provided with an input shaft hole and an output shaft hole extending therethrough; the side of the front housing facing away from the rear housing has a motor housing coaxially arranged with the input shaft hole, and the other end of the motor housing is provided with an end cover; the front housing protrudes outward along the output shaft hole to form an output shell that is overall conical, and the output shell has connecting ribs extending toward the motor shell, and the connecting ribs are connected to the motor shell.

[0006] In the above structure, by providing connecting ribs on the output shell and connecting the connecting ribs to the motor shell, the thickness and strength of the front shell in the area between the motor and the output shaft can be increased, thereby preventing the front shell from cracking or breaking under the stress of repeated bumps, which is beneficial to extending the service life of the shell.

[0007] Furthermore, the connecting ribs are arranged to extend radially along the output housing, and at least two connecting ribs are arranged circumferentially around the output housing.

[0008] In this way, by connecting the output housing and the motor housing with a plurality of connecting ribs, the overall strength of the housing can be further increased.

[0009] Furthermore, the output shell has radially arranged reinforcing ribs, and a plurality of the reinforcing ribs are distributed along the circumference of the output shell.

[0010] In this way, the strength of the output shell itself can be increased by reinforcing the ribs, thereby preventing cracks or breakage at the output shell.

[0011] Furthermore, the front housing has an annular mounting surface on a side facing away from the rear housing that is concentric with the input shaft hole. The annular mounting surface has a mounting hole that matches the motor housing, and the motor housing is fixed to the mounting hole by bolts.

[0012] Furthermore, the connecting rib or the motor housing has a clip extending axially along the input shaft hole, and the motor housing or the connecting rib has a slot matching the clip, and the motor housing is clipped onto the connecting rib through the clip and the slot.

[0013] In this way, the connecting rib and the motor housing are connected by means of a card slot and a card strip, which can not only ensure the connection strength between the two, but also make the connecting rib adaptable to motor housings of different lengths, thereby improving the versatility of the front housing and helping to reduce mold opening costs.

[0014] Furthermore, the height of the connecting rib is smaller than the length of the motor housing, and the connecting rib has a threaded hole arranged along the axial direction of the input shaft hole on the side facing the motor housing; the motor housing has a convex ridge arranged corresponding to the connecting rib on the side facing the connecting rib, one end of the convex ridge is adjacent to the top of the connecting rib, and the convex ridge has a bolt hole arranged along the axial direction of the motor housing, and the motor housing is connected to the threaded hole of the connecting rib by a connecting bolt passing through the bolt hole.

[0015] In this way, by connecting the connecting bolts along the axial direction of the motor housing and connecting the ribs, the difficulty of fitting the motor housing and the connecting ribs can be reduced, the fitting accuracy of the mold opening can be reduced, and this structure can also adapt to motor housings of different lengths.

[0016] Furthermore, the motor housing is integrally formed on the front housing, and the connecting rib is integrally connected to the motor housing.

[0017] An electric drive assembly includes the housing structure of the electric drive assembly as described above.

[0018] Furthermore, a rotor assembly is provided in the motor housing, an output shaft of the rotor assembly passes through the input shaft hole and extends into the reduction box, and a first-stage gear of the reduction box is mounted on the output shaft.

[0019] An electric vehicle comprises the electric drive assembly described above.

[0020] In summary, the electric drive assembly housing structure, electric drive assembly and electric vehicle of the present invention all have advantages such as reasonable structural design, the ability to improve the overall strength of the housing, and the benefit of extending service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0022] Figure 2 for Figure 1 Schematic diagram of the shell structure.

[0023] Figure 3 and Figure 4 for Figure 1 Schematic diagram of the decomposition structure.

[0024] Figure 5 This is a schematic diagram of the decomposed structure of the output shaft part of the motor.

[0025] Figure 6 This is a schematic diagram of the shell structure of Example 2.

[0026] Figure 7 for Figure 6 Schematic diagram of the enlarged structure of the middle elliptical part.

[0027] Figure 8 This is a schematic diagram of the shell structure of Example 3.

[0028] Figure 9 for Figure 8 Schematic diagram of the enlarged structure of the middle elliptical part. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the embodiments.

[0030] Example 1: Figures 1 to 6As shown, an electric drive assembly includes a motor and a reduction gearbox, the reduction gearbox includes a front housing 1 and a rear housing 2, the front housing 1 is provided with an input shaft hole 11 and an output shaft hole 12; the side of the front housing 1 facing away from the rear housing 2 has a motor housing 3 coaxially arranged with the input shaft hole 11, and the other end of the motor housing 3 is provided with an end cover 4; the front housing 1 protrudes outward along the output shaft hole 12 to form an overall conical output shell 13, the output shell 13 has a connecting rib 14 extending toward the motor housing 3, and the connecting rib 14 is connected to the motor housing 3.

[0031] In this embodiment, Figure 2 As shown, the motor housing 3 is integrally formed on the front housing 1, and the connecting ribs 14 are integrally connected to the motor housing 3. The connecting ribs 14 extend radially along the output housing 13, with three ribs provided circumferentially. This increases the strength of the area between the output housing 13 and the motor housing, preventing cracks or breakage in the front housing caused by impact stress, thereby extending the service life of the electric drive assembly.

[0032] In addition, the output housing 13 has radially arranged reinforcing ribs 15, and a plurality of the reinforcing ribs 15 are distributed along the circumference of the output housing 13. In this way, the strength of the output housing can be increased by the reinforcing ribs, thereby preventing cracks or breakages from occurring in the output housing.

[0033] A rotor assembly is provided in the motor housing 3 , the output shaft of the rotor assembly passes through the input shaft hole 11 and extends into the reduction gearbox, and the first-stage gear of the reduction gearbox is mounted on the output shaft; a dynamic seal assembly 5 is provided between the output shaft and the input shaft hole 11 .

[0034] Specifically, the input shaft hole 11 has an oil seal mounting hole that is expanded radially outward at one end facing the rear housing 2, and the other end of the input shaft hole 11 has a bearing mounting hole that is expanded radially outward; the dynamic seal assembly 5 includes an oil seal 51 installed in the oil seal mounting hole and a bearing 52 installed in the bearing mounting hole, and the output shaft passes through the bearing 52 and the oil seal 51 in a cooperative manner.

[0035] The output shaft includes a main shaft section 31, a bearing shaft section 32, an oil seal shaft section 33 and a gear shaft section 34, the diameters of which are arranged to decrease successively in the direction toward the rear housing 2. The diameter of the bearing shaft section 32 matches the inner diameter of the bearing 52, and the diameter of the oil seal shaft section 33 matches the inner diameter of the oil seal 51. A retaining ring groove 35 is provided between the bearing shaft section 32 and the oil seal shaft section 33. The spacing between the retaining ring groove 35 and the main shaft section 31 matches the thickness of the bearing 52. The inner ring of the bearing 52 is fixed to the bearing shaft section 32 by a retaining ring installed on the retaining ring groove 35.

[0036] The diameter of the gear shaft section 34 is consistent with the inner diameter of the primary gear, and has a first keyway 36 arranged along the axial direction; the primary gear has a second keyway matching the first keyway 36, and the primary gear is installed on the gear shaft section 34 by means of a key matched in the first keyway 36 and the second keyway. In this embodiment, two first keyways 36 are evenly distributed along the circumference of the gear shaft section 34.

[0037] A threaded section with threads is coaxially provided at the end of the gear shaft section 34, and the maximum radius of the threaded section is smaller than the distance from the first keyway 36 to the axis center; the length of the gear shaft section 34 is smaller than the thickness of the first-stage gear, and the first-stage gear is mounted on the gear shaft section 34 by a gasket sleeved on the threaded section and a fastening nut connected to the threaded section.

[0038] An annular positioning platform is protruding from the bottom of the bearing mounting hole, and the positioning platform is connected to the inner wall of the bearing mounting hole; the radial width of the positioning platform matches the thickness of the outer ring of the bearing 52, and the side of the end cover portion 23 facing away from the rear housing has threaded blind holes uniformly distributed along the circumference of the input shaft hole 22, and an annular pressure plate 6 is installed by bolts, the inner diameter of the pressure plate 6 is smaller than the outer diameter of the bearing 52, and the minimum distance between the pressure plate 6 and the positioning platform is smaller than the thickness of the bearing 52, and the bearing 52 is fixed in the bearing mounting hole by the pressure plate 6.

[0039] The integrated end cap directly attached to the front housing of the reduction gearbox allows the motor and reduction gearbox to share the same end cap, resulting in a more compact structure. This allows for the placement of a higher-power motor within a limited space, facilitating overall power improvement. Furthermore, mounting the primary gear directly on the motor's output shaft eliminates the need for a spline connection, eliminating the backlash associated with the spline drive, reducing the impact of side play during starting and braking, and lowering start-stop noise. This also eliminates concentricity issues associated with the spline drive, preventing excessive wear and tear that can lead to severe heating and even oil seal overheating and leakage, thereby extending the lifespan.

[0040] Example 2: The main difference from Example 1 is that the structural relationship between the motor housing, the connecting ribs and the front housing 1 is different. Specifically, in this embodiment, Figure 6 and Figure 7 As shown, the front housing 1, output housing 13, and connecting rib 14 are integrally formed. The side of the front housing 1 facing away from the rear housing 2 includes an annular mounting surface concentrically arranged with the input shaft hole 11. This annular mounting surface includes a mounting hole that matches the motor housing 3, and the motor housing 3 is secured to the mounting hole via bolts. The connecting rib 14 includes a clip 141 extending axially along the input shaft hole 11. The motor housing 3 includes a slot 142 that matches the clip 141. The motor housing 3 is engaged with the connecting rib 14 via the clip 141 and slot 142. Connecting the connecting rib to the motor housing through the clip slot and clip not only ensures the strength of the connection, but also allows the connecting rib to accommodate motor housings of different lengths, improving the versatility of the front housing and reducing mold costs.

[0041] In this embodiment, the end surface of the clamping strip 141 is trapezoidal. In specific implementations, the clamping strip 141 may also adopt other structures, such as a cylindrical shape, and the positional relationship between the clamping strip 141 and the clamping slot 142 may also be interchangeable. Furthermore, while one connecting rib 14 is provided in this embodiment, multiple connecting ribs 14 may be provided in specific implementations to accommodate the required space.

[0042] Example 3: The main difference from Example 1 is that the structural relationship between the motor housing, the connecting ribs and the front housing 1 is different. Specifically, in this embodiment, Figure 8 and Figure 9As shown, the front housing 1, output housing 13, and connecting rib 14 are integrally formed. The side of the front housing 1 facing away from the rear housing 2 has an annular mounting surface concentrically arranged with the input shaft hole 11. The annular mounting surface has a mounting hole that matches the motor housing 3, and the motor housing 3 is fixed to the mounting hole by bolts. The height of the connecting rib 14 is less than the length of the motor housing 3. The side of the connecting rib 14 facing the motor housing 3 has a threaded hole 143 axially arranged along the input shaft hole 11. The side of the motor housing 3 facing the connecting rib 14 has a ridge 144 corresponding to the connecting rib 14. One end of the ridge 144 abuts the top of the connecting rib 14. The ridge 144 has a bolt hole 145 extending axially through the motor housing 3. The motor housing 3 is connected to the threaded hole 143 of the connecting rib 14 via a connecting bolt passing through the bolt hole 145. In this way, by connecting the connecting ribs with connecting bolts running along the axial direction of the motor housing, the difficulty of fitting the motor housing and the connecting ribs can be reduced, the fitting accuracy of the mold opening can be reduced, and costs can be reduced. Moreover, this structure can also adapt to motor housings of different lengths. In this embodiment, a single connecting rib 14 is provided. In a specific implementation, multiple connecting ribs 14 can be arranged in a fan shape, or the other sides of multiple connecting ribs 14 can be connected to each other to form an arc-shaped side wall, and the threaded holes can be provided on the arc-shaped side wall.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A housing structure of an electric drive assembly, comprising a front housing (1) and a rear housing (2) of a reduction gearbox, wherein the front housing (1) is provided with an input shaft hole (11) and an output shaft hole (12) extending therethrough; wherein: The front housing (1) has a motor housing (3) coaxially arranged with the input shaft hole (11) on a side facing away from the rear housing (2), and an end cover (4) is provided at the other end of the motor housing (3); the front housing (1) protrudes outward along the output shaft hole (12) to form an output housing (13) that is tapered as a whole, and the output housing (13) has a connecting rib (14) extending toward the motor housing (3), and the connecting rib (14) is connected to the motor housing (3).

2. The housing structure of the electric drive assembly according to claim 1, characterized in that: The connecting ribs (14) are arranged to extend radially along the output housing (13), and at least two are arranged circumferentially on the output housing (13).

3. The housing structure of the electric drive assembly according to claim 2, characterized in that: The output housing (13) has radially arranged reinforcing ribs (15), and a plurality of the reinforcing ribs (15) are distributed along the circumference of the output housing (13).

4. The housing structure of the electric drive assembly according to claim 1, wherein: The front housing (1) has an annular mounting surface on a side facing away from the rear housing (2) and arranged concentrically with the input shaft hole (11), and the annular mounting surface has a mounting hole matching the motor housing (3), and the motor housing (3) is fixed to the mounting hole by bolts.

5. The housing structure of the electric drive assembly according to claim 4, characterized in that: The connecting rib (14) or the motor housing (3) has a clamping strip (141) extending along the axial direction of the input shaft hole (11), and the motor housing (3) or the connecting rib (14) has a clamping groove (142) matching the clamping strip (141), and the motor housing (3) is clamped to the connecting rib (14) through the clamping strip (141) and the clamping groove (142).

6. The housing structure of the electric drive assembly according to claim 4, characterized in that: The height of the connecting rib (14) is less than the length of the motor housing (3), and the connecting rib (14) has a threaded hole arranged along the axial direction of the input shaft hole (11) on the side facing the motor housing (3); the motor housing (3) has a ridge arranged corresponding to the connecting rib (14) on the side facing the connecting rib (14), one end of the ridge is adjacent to the top of the connecting rib (14), and the ridge has a bolt hole arranged along the axial direction of the motor housing (3), and the motor housing (3) is connected to the threaded hole of the connecting rib (14) by a connecting bolt passing through the bolt hole.

7. The housing structure of the electric drive assembly according to claim 1, characterized in that: The motor housing (3) is integrally formed on the front housing (1), and the connecting rib (14) is integrally formed and connected to the motor housing (3).

8. An electric drive assembly, characterized in that: A housing structure comprising the electric drive assembly according to any one of claims 1 to 7.

9. The electric drive assembly according to claim 8, characterized in that: A rotor assembly is provided in the motor housing (3); an output shaft of the rotor assembly passes through the input shaft hole (11) and extends into the reduction box; a first-stage gear of the reduction box is mounted on the output shaft.

10. An electric vehicle, characterized in that: Comprising an electric drive assembly as claimed in claim 8 or 9.

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