Electric drive assembly

Abstract

The utility model relates to an electric drive assembly, which comprises a motor and a transmission device, and is characterized in that the motor comprises a motor shell, a stator assembly positioned in the motor shell, a rotor assembly positioned in the stator assembly and a rotor shaft fixedly connected with the rotor assembly; the transmission device is provided with a transmission device shell and an input shaft fixedly connected with the rotor shaft, the input shaft is a hollow shaft, and an overlapped part exists between the input shaft and the transmission device shell in the axial direction. And the input shaft and the transmission device shell are spaced in the radial direction in the overlapped part in the axial direction, so that a space is formed, and a sealing device is arranged in the space. Through the design of the oil duct, the oil conveying device and the oil separator on the motor shell, the problem of insufficient lubrication and cooling of the rotor and the stator of the permanent magnet synchronous motor in the electric drive assembly is solved, the efficiency of the rotor and the stator of the motor is improved, and the service life of the rotor and the stator of the motor is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of driving, and specifically relates to an electric driving assembly. Background Art

[0002] The electric drive assembly generally includes a motor and a transmission device connected to it. The motor generates heat during operation, so it needs to be cooled to improve the motor's operating efficiency and prevent overheating that affects the motor's life. In addition, since the motor's rotor speed is high, the bearings supporting the rotor shaft also need to be lubricated to reduce wear.

[0003] For permanent magnet synchronous motors, water cooling is usually performed by setting water channels in the motor casing. However, this solution has low cooling efficiency and can only cool the motor stator but not the motor rotor or motor shaft. Currently available oil-cooled motors also mostly just spray the motor stator windings, with average cooling effects, and are also unable to cool the motor rotor or motor shaft. Some oil-cooled motors also inject cooling oil to cover the lowest point of the motor rotor, and use the rotation of the rotor to stir the cooling oil to cool the motor rotor and stator windings. However, in this solution, the rotor is immersed in cooling oil, which will greatly increase the resistance to rotor rotation and directly affect the motor performance and efficiency. Utility Model Content

[0004] Based on the applicant's research and practical experience in this field, the following improved technical solutions are proposed here.

[0005] An electric drive assembly includes a motor and a transmission device, wherein the motor includes a motor housing, a stator assembly located inside the motor housing, a rotor assembly located inside the stator assembly, and a rotor shaft fixedly connected to the rotor assembly, and the transmission device includes a transmission device housing and an input shaft fixedly connected to the rotor shaft.

[0006] The input shaft is a hollow shaft and has an axially overlapping portion with the transmission housing. In the axially overlapping portion, the input shaft and the transmission housing are radially spaced apart to form a space, and a sealing device is arranged in the space.

[0007] The sealing device is used to optimize the lubrication efficiency. The sealing device not only avoids the leakage and waste of lubricating oil, but also allows the oil to enter the rotor shaft with sufficient pressure.

[0008] As a feasible preferred solution of the utility model, the sealing device includes a steel sleeve and a sealing ring arranged in a groove on the outer peripheral surface of the steel sleeve.

[0009] As a feasible preferred solution of the utility model, the steel sleeve is a steel sleeve, and the sealing ring is a rectangular sealing ring.

[0010] As a feasible and preferred solution of the utility model, the rotor shaft and the input shaft are both hollow shafts, and a tubular oil delivery device is arranged inside the input shaft.

[0011] As a feasible preferred solution of the utility model, a sealing ring is provided between the oil delivery device and the input shaft.

[0012] As a feasible preferred solution of the utility model, an axially extending motor housing oil passage is provided inside the motor housing, and a plurality of through holes communicating with the inner cavity of the motor housing are provided in the radially inward direction of the motor housing oil passage.

[0013] As a feasible preferred solution of the utility model, oil separators are respectively arranged on the rotor shaft and on both sides of the rotor assembly.

[0014] As a feasible preferred solution of the utility model, the rotor shaft is provided with a hole at a portion axially overlapping with the oil separator, and the oil separator adopts an annular structure and is provided with at least one oil outlet hole.

[0015] As a feasible preferred solution of the utility model, it also includes an oil pump and a cooling device.

[0016] The utility model solves the problem of insufficient lubrication and cooling of the permanent magnet synchronous motor rotor and stator in the electric drive assembly by designing the oil passage, oil delivery device and oil distributor on the motor housing, improves the efficiency of the motor rotor and stator, and prolongs their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Exemplary embodiments of the present invention are described with reference to the accompanying drawings, in which:

[0018] Figure 1 A cross-sectional view of the electric drive assembly of the utility model is shown.

[0019] Figure 2 A three-dimensional view of the sealing device of the present invention is shown.

[0020] Figure 3 The utility model shows an assembly diagram of an oil delivery device and a sealing ring.

[0021] Figure 4 A cross-sectional view of a motor housing of the present invention is shown.

[0022] Figure 5 A partial stereoscopic view of the electric drive assembly of the utility model is shown. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, many specific details are set forth so that those skilled in the art can more fully understand and implement the present invention. However, it is obvious to those skilled in the art that the implementation of the present invention may not have some of these specific details. In addition, it should be understood that the present invention is not limited to the specific embodiments described. On the contrary, any combination of the features and elements described below may be considered to implement the present invention, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments and advantages are for illustrative purposes only and should not be regarded as features or limitations of the claims unless clearly stated in the claims.

[0024] In the following description, the descriptions about directions, such as "upper", "lower", "inner", "outer", "radial", "axial", etc., which may be used, are only for the convenience of description, unless otherwise specified, and are not intended to form any limitation on the technical solution of the utility model. In addition, in the following description, terms such as "first", "second", etc. are used to describe the elements of the present application, and these terms are only used to distinguish the elements, and are not intended to limit the nature, sequence, order or number of these elements.

[0025] Figure 1 A cross-sectional view of the electric drive assembly of the utility model is shown. Figure 1 It can be seen that the electric drive assembly includes a motor and a transmission device connected thereto. Specifically, the motor is located on the left side, and includes a housing, a stator assembly 8, a rotor assembly 5, etc. The housing 8 is in the shape of a ring with openings at both ends, and the stator assembly 8 and the rotor assembly 5 are accommodated therein. The stator assembly 8 includes a stator core and a stator winding, and the stator core is composed of a plurality of stacked laminations and has a plurality of stator teeth. The stator winding is wound on the stator teeth. The rotor assembly 5 can take any known form. For example, a rotor provided with a permanent magnet can be used, and the permanent magnet can be set on the rotor core in an embedded manner, or can be set on the surface of the rotor core in a mounted manner. The rotor can also be wound with a winding. In the radial direction, the stator assembly 8 is located inside the housing, and the rotor assembly is located inside the stator assembly 8.

[0026] The rotor shaft 6 is fixedly connected to the rotor assembly 5. Therefore, when the rotor rotates, the rotor shaft 6 can rotate accordingly, thereby outputting torque outward. Figure 1 As can be seen in the figure, the rotor shaft 6 is in the form of a hollow shaft, and a channel for oil flow is formed inside the shaft. Furthermore, oil separators 9 are provided on both sides of the rotor assembly 5 on the rotor shaft 6. A hole is provided at the position where the oil separator 9 contacts the rotor shaft 6, so that the oil in the rotor shaft 6 can enter the oil separator 9 through the hole. The oil separator 9 can be annular in structure, and a plurality of oil outlet holes can be provided thereon.

[0027] An end cover is provided on one side of the motor. A bearing support portion may be provided in the end cover, wherein a bearing 7 is accommodated. The end cover is further fixedly connected to a transmission housing 1, in which a transmission mechanism is accommodated. Figure 1 The input shaft fixedly connected to the rotor shaft 6 of the motor is only shown as an example. A bearing support portion may be provided on the transmission housing, in which a bearing 7 is supported. Both ends of the input shaft are supported by bearings 7 respectively. The input shaft also adopts the form of a hollow shaft, and an oil delivery device 3 is provided inside it. The oil delivery device 3 adopts a tubular structure and is connected to the inside of the rotor shaft 8 of the motor, thereby forming a through oil channel.

[0028] Figure 1 The arrows in the figure show the flow direction of the lubricating oil. Since one end of the input shaft is supported on the transmission housing by a bearing 7, a sealing device 2 is provided between the input shaft and the transmission housing to ensure the seal between the oil delivery device 3 and the transmission housing to prevent the oil from flowing out of the flow path. Specifically, in the axial direction, there is an overlapping portion between the input shaft 2 and the transmission housing 1, and there is a certain distance between the two in the radial direction, and the sealing device 2 is located in the space defined by this distance.

[0029] Figure 2 The three-dimensional diagram of the sealing device of the utility model is shown. The sealing device 2 is mainly composed of a steel sleeve and a sealing ring. The sealing ring is set in the annular groove on the steel sleeve, and its surface is higher than the outer peripheral surface of the steel sleeve. When the electric drive device is running, the input shaft drives the oil delivery device 3 to rotate, and when the lubricating oil comes out of the oil channel of the transmission device housing 1 and enters the oil delivery device 3, the sealing device 2 completely seals the oil between the transmission device housing 1 and the oil delivery device 3 to avoid leakage and waste of oil, and allows the oil to have enough pressure to enter the oil delivery device 3, and then reach the cavity of the motor rotor shaft 6 to lubricate the motor. The steel sleeve and the sealing ring preferably adopt a rectangular structure, that is, a rectangular steel and a rectangular sealing ring.

[0030] Figure 3 The figure shows the assembly diagram of the oil delivery device and the sealing ring of the utility model. Figure 1 and Figure 3 It can be seen that a sealing ring 4 is provided on the oil delivery device 3, and the sealing ring 4 is radially located between the input shaft and the oil delivery device 3. The sealing ring 4 can play a supporting and sealing role, and prevent the lubricating oil from entering the cavity that does not need lubrication, so as to save the lubricating oil and make the oil delivery device work more stably.

[0031] Figure 4 A cross-sectional view of the motor housing of the present utility model is shown. Figure 4As can be seen in the figure, an axially extending motor housing oil passage 10 is provided inside the motor housing 11. The motor housing oil passage 10 can be communicated with other oil passages, and a plurality of through holes are provided in the radially inward direction of the motor housing oil passage 10 so as to communicate with the inner cavity of the motor housing, thereby providing oil to the components in the motor housing, such as the stator core, stator winding or rotor, etc.

[0032] Figure 5 FIG. 1 shows a partial stereoscopic view of the electric drive assembly of the utility model. Figure 5 As can be seen in the figure, an oil pump 12 and a cooling device 13 can also be fixedly connected to the motor housing 11 to achieve pumping and cooling of the oil.

[0033] The structure of the electric drive assembly of the utility model is described in detail above. The working process of the electric drive assembly of the utility model is described below.

[0034] When the motor is running, the oil pump 12 starts working and pumps the oil from the oil pool to the oil circuit. After passing through the cooling device 13, the oil reaches the oil passage of the transmission housing 1, and then enters the oil delivery device 3. Due to the presence of the sealing device 2, the oil has sufficient pressure to enter the oil delivery device 3, and then enters the interior of the motor rotor shaft 6 as the oil delivery device 3 rotates. The oil then passes through the hole on the motor rotor shaft 6 to the oil separator 9, and then enters the interior of the rotor. In addition, a portion of the oil can also enter the oil passage of the motor housing 11, and reach the stator assembly and rotor assembly of the motor through the through hole, so as to achieve the function of lubricating and cooling the motor rotor.

[0035] The above description is merely an exemplary embodiment of the spirit and principle of the present invention. It will be appreciated by those skilled in the art that various changes may be made to the described examples without departing from the spirit and principle, and these changes and their various equivalents are anticipated by the applicant and fall within the scope defined by the claims of the present invention.

Claims

1. An electric drive assembly, comprising a motor and a transmission device, wherein the motor comprises a motor housing (11), a stator assembly (8) located inside the motor housing, a rotor assembly (5) located inside the stator assembly, and a rotor shaft (6) fixedly connected to the rotor assembly, and the transmission device comprises a transmission device housing (1) and an input shaft fixedly connected to the rotor shaft, It is characterized in that The input shaft is a hollow shaft and has an axially overlapping portion with the transmission housing. In the axially overlapping portion, the input shaft and the transmission housing are radially spaced apart to form a space, in which a sealing device (2) is arranged.

2. The electric drive assembly according to claim 1, It is characterized in that The sealing device (2) comprises a steel sleeve and a sealing ring arranged in a groove on the outer peripheral surface of the steel sleeve.

3. The electric drive assembly according to claim 2, It is characterized in that The steel sleeve is a steel sleeve, and the sealing ring is a rectangular sealing ring.

4. The electric drive assembly according to any one of claims 1 to 3, It is characterized in that The rotor shaft (6) and the input shaft are both hollow shafts, and a tubular oil delivery device (3) is arranged inside the input shaft.

5. The electric drive assembly according to claim 4, It is characterized in that A sealing ring (4) is provided between the oil delivery device (3) and the input shaft.

6. The electric drive assembly according to any one of claims 1 to 3, It is characterized in that An axially extending motor housing oil passage (10) is provided inside the motor housing (11), and a plurality of through holes communicating with the inner cavity of the motor housing are provided in the radially inward direction of the motor housing oil passage.

7. The electric drive assembly according to any one of claims 1 to 3, It is characterized in that Oil separators (9) are respectively arranged on the rotor shaft (6) and on both sides of the rotor assembly (5).

8. The electric drive assembly according to claim 7, It is characterized in that The rotor shaft (6) is provided with a hole at a portion axially overlapping with the oil separator (9); the oil separator adopts an annular structure and is provided with at least one oil outlet hole.

9. The electric drive assembly according to any one of claims 1 to 3, It is characterized in that It also includes an oil pump (12) and a cooling device (13).

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