An end cap, electric drive axle and motor vehicle

Abstract

The application discloses an end cover, an electric drive axle and a motor vehicle. The end cover comprises an end cover body, the two ends of the end cover body along the axial direction of the end cover body comprise a first end and a second end, the first end comprises a first cavity for mounting a rotary transformer, and the second end comprises a second cavity in communication with the shell of a motor. A partition plate is arranged in the middle of the axial direction of the end cover, the partition plate is used for separating the first cavity and the second cavity, and the partition plate comprises a shaft hole matched with the rotating shaft of the motor. After the shaft hole of the partition plate is matched with the rotating shaft of the motor, the rotating shaft blocks the shaft hole, the first cavity and the second cavity form two isolated cavities through the partition plate, the magnetic field generated by the motor stator cannot be transmitted from the second cavity to the first cavity through the partition plate, the electromagnetic interference of the magnetic field generated by the motor stator on the stator of the rotary transformer is greatly reduced, the accuracy of the rotary transformer for monitoring the position and speed of the motor rotor is improved, the accuracy of the vehicle controller for monitoring the speed of the vehicle is improved, and the adverse effect on the safety of the vehicle is reduced.

Description

Technical Field

[0001] This application relates to the field of motor vehicle technology, and in particular to an end cover, an electric drive axle, and a motor vehicle. Background Technology

[0002] In related technologies, the magnetic field generated by the motor stator can interfere with the stator of the rotary transformer, making it impossible to accurately monitor the position and speed of the motor rotor. This, in turn, affects the vehicle controller's accurate monitoring of the vehicle speed, which has an adverse impact on vehicle safety. Utility Model Content

[0003] This application proposes an end cap to reduce the interference of the magnetic field generated by the motor stator on the stator of the rotary transformer. This application also proposes an electric drive bridge including the aforementioned end cap and a motor vehicle having the aforementioned electric drive bridge.

[0004] In a first aspect, this application provides an end cap, including an end cap body, wherein a first end of the end cap body in the axial direction includes a first cavity for mounting a rotary transformer, and a second end of the end cap body in the axial direction includes a second cavity communicating with the housing of a motor.

[0005] A partition is provided at the center of the end cap body along the axial direction. The partition is used to separate the first cavity and the second cavity. The partition includes a shaft hole that mates with the rotating shaft of the motor.

[0006] Preferably, in the above-mentioned end cap, the first cavity includes a first side surface located at a first end of the end cap body and a first convex ring connected to the first side surface, and the end of the first convex ring away from the first side surface is connected to the shaft tube flange.

[0007] The first side has a mounting groove communicating with the first cavity, and a portion of the rotor of the rotary transformer is located in the mounting groove.

[0008] Preferably, in the above-mentioned end cap, the second cavity includes a second side surface located at the second end of the end cap body and a second convex ring connected to the second side surface, and the end of the second convex ring away from the second side surface is connected to the housing;

[0009] The second cavity further includes a third convex ring for mounting the bearing, the third convex ring being located inside the second convex ring, and the annular space enclosed by the third convex ring communicating with the shaft hole.

[0010] Preferably, in the end cap described above, the length of the third convex ring is greater than the length of the second convex ring along the axial direction of the end cap body.

[0011] Preferably, in the above-mentioned end cap, the outer diameter of the third convex ring gradually increases from the end away from the second side to the end closer to the second side.

[0012] Preferably, in the above-mentioned end cap, the bore wall of the shaft hole includes an oil seal mounting cavity.

[0013] Preferably, in the end cap described above, the first cavity includes a wire harness fixing protrusion for fixing the wire harness.

[0014] Preferably, in the end cap described above, a groove for securing the wire harness is formed between two adjacent wire harness fixing protrusions; or,

[0015] The wire harness fixing protrusion includes a groove for fixing the wire harness.

[0016] Secondly, this application provides an electric drive bridge, including an end cover, wherein the end cover is the end cover described in any of the above embodiments.

[0017] Thirdly, this application provides a motor vehicle, including an electric drive axle, wherein the electric drive axle is the electric drive axle described in the above-mentioned scheme.

[0018] This application discloses an end cap, including an end cap body. The end cap body has a first end and a second end along its own axis. The first end includes a first cavity for mounting a rotary transformer, and the second end includes a second cavity communicating with the housing of a motor. This application discloses an end cap with a partition disposed in the middle of its axial direction. The partition separates the first cavity and the second cavity, and includes a shaft hole that mates with the motor's rotating shaft. After the shaft hole of the partition mates with the motor's rotating shaft, the rotating shaft seals the shaft hole. The first cavity and the second cavity form two isolated chambers through the partition. The magnetic field generated by the motor stator cannot be transmitted from the second cavity to the first cavity through the partition, greatly reducing the electromagnetic interference of the magnetic field generated by the motor stator on the stator of the rotary transformer. This improves the accuracy of the rotary transformer in monitoring the motor rotor position and speed, improves the accuracy of the vehicle controller in monitoring the vehicle speed, and reduces adverse effects on vehicle safety.

[0019] This application discloses an electric drive bridge, including an end cover, which is the end cover described in any of the above-mentioned embodiments. Since the end cover has the above-mentioned technical effects, the electric drive bridge with the end cover also has the same technical effects, which will not be described in detail here.

[0020] This application also discloses a motor vehicle, including an electric drive axle, which is the electric drive axle described in the above-described scheme. Since the electric drive axle has the aforementioned technical effects, the motor vehicle having this electric drive axle also has the same technical effects, which will not be elaborated further here. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort, and this application can be applied to other similar scenarios based on the provided drawings. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0022] Figure 1 This is an isometric view of the end cap provided in an embodiment of this application;

[0023] Figure 2 This is an isometric view of the end cap provided in an embodiment of this application;

[0024] Figure 3 This is a cross-sectional view of the end cap provided in an embodiment of this application.

[0025] The attached diagram is described below:

[0026] 1-End cap body; 11-First side; 12-First convex ring; 13-Mounting groove; 14-Second side; 15-Second convex ring; 16-Third convex ring; 2-First cavity; 3-Second cavity; 4-Baffle. Detailed Implementation

[0027] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. The described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0028] It should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in these embodiments can be arbitrarily combined, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features.

[0029] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0030] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0031] A rotary transformer is an electromagnetic sensor used to measure the angular displacement and angular velocity of the shaft of a rotating object, including the stator and rotor.

[0032] When a rotary transformer is used as a component in an electric motor, it can monitor the rotor position and speed in real time. However, in related technologies, the rotary transformer is susceptible to the magnetic field generated by the stator and rotor windings of the motor itself, which reduces the measurement accuracy of the rotary transformer.

[0033] Firstly, such as Figure 1 The figure shown is an isometric view of the end cover disclosed in this application. The end cover includes an end cover body 1, and the end cover body 1 has a first side and a second side at both ends along its own axis. The first end includes a first cavity 2 for mounting a rotary transformer, and the second end includes a second cavity 3 that communicates with the housing of a motor.

[0034] like Figure 3 As shown, this application discloses an end cover, in which a partition 4 is provided in the middle of the end cover in the axial direction. The partition 4 is used to separate the first cavity 2 and the second cavity 3. The partition 4 includes a shaft hole that mates with the rotating shaft of the motor.

[0035] During installation, the motor shaft passes through the bearing, with the portion of the shaft in the first cavity 2 connected to the rotor of the rotary transformer; the portion of the motor shaft in the second cavity 3 is also connected to the bearing. After the shaft hole of the partition 4 mates with the motor shaft, the shaft seals the shaft hole. The first cavity 2 and the second cavity 3 form two isolated chambers through the partition 4. The magnetic field generated by the motor stator cannot be transmitted from the second cavity 3 to the first cavity 2 through the partition 4, greatly reducing the electromagnetic interference of the magnetic field generated by the motor stator on the stator of the rotary transformer. This improves the accuracy of the rotary transformer in monitoring the position and speed of the motor rotor, enhances the accuracy of the vehicle controller in monitoring the vehicle speed, and reduces adverse effects on vehicle safety.

[0036] The partition 4 is located in the middle of the end cover body 1 along its own axis. Specifically, the partition 4 is located between the rotary transformer and the bearing. The specific position of the partition 4 is designed according to the situation of the rotary transformer and the bearing.

[0037] In some embodiments, the first cavity 2 includes a first side surface 11 located at a first end of the end cap body 1 and a first protruding ring 12 connected to the first side surface 11, wherein the first side surface 11 is perpendicular to the axis of the end cap body 1, and the first protruding ring 12 is coaxial with the end cap body 1. The first cavity 2 formed by the first protruding ring 12 and the first side surface 11 is an open cavity, and the open end of the open cavity is connected to the shaft tube flange.

[0038] The first end of the first protruding ring 12 is connected to the first side surface 11, and the second end of the first protruding ring 12 is away from the first side surface 11 relative to the first end. The end face of the second end of the first protruding ring 12 forms the first mating surface for connection with the shaft tube flange.

[0039] like Figure 1 As shown, the first convex ring 12 is located at the middle position of the end cover body 1 along the radial direction of the shaft hole, and the first convex ring 12 has the same diameter as the shaft tube flange.

[0040] Optionally, the first protruding ring 12 is integrally formed with the end cap body 1.

[0041] The first side 11 has a mounting groove 13 that communicates with the first cavity 2, and a part of the rotor of the rotary transformer is located in the mounting groove 13.

[0042] The structure of the first cavity 2 is not limited to the above embodiments. Other structures that can realize the installation of the rotary transformer and the connection with the shaft tube flange are also within the scope of protection of this application.

[0043] The second cavity 3 includes a second side surface 14 located at the second end of the end cap body 1, and a second protruding ring 15 connected to the second side surface 14. The second side surface 14 is perpendicular to the axis of the end cap body 1, and the second protruding ring 15 is coaxial with the end cap body 1. The second cavity 3 formed by the second side surface 14 and the second protruding ring 15 is an open cavity, and the open end of the open cavity is connected to the motor housing. Optionally, the second protruding ring 15 is connected to the motor housing by bolts.

[0044] The first end of the second protruding ring 15 is connected to the second side surface 14, and the second end of the second protruding ring 15 is away from the second side surface 14 relative to the first end. The end face of the second end of the second protruding ring 15 forms a second mating surface that is connected to the housing of the motor.

[0045] like Figure 2 As shown, the second convex ring 15 is arranged along the outer periphery of the end cover body 1, and the second convex ring 15 has the same diameter as the motor housing.

[0046] Optionally, the second protruding ring 15 is integrally formed with the end cap body 1.

[0047] The second cavity 3 also includes a third convex ring 16, which is located inside the second convex ring 15 and is used to install the bearing.

[0048] Optionally, the rotational connection between the shaft and the end cover is achieved through a bearing, which is installed inside the third convex ring 16, and the annular space formed by the third convex ring 16 communicates with the shaft hole.

[0049] The side of the partition 4 near the third convex ring 16 can abut against the bearing, and the partition 4 limits the bearing along the axial direction of the end cover body 1.

[0050] Optionally, the third protruding ring 16 is integrally formed with the end cap body 1.

[0051] In this design, the first convex ring 12, the second convex ring 15, and the third convex ring 16 are coaxial.

[0052] like Figure 3 As shown, along the axial direction of the end cover body 1, the length of the third convex ring 16 is greater than the length of the first and second convex rings. On the one hand, this ensures the effective installation of the bearing, and on the other hand, it increases the length of the third convex ring 16 that penetrates into the motor housing, thereby enhancing the isolation effect on the magnetic field generated by the motor stator.

[0053] The diameter of the outer circle of the third convex ring 16 gradually increases from the end away from the second side surface 14 to the end closer to the second side surface 14, so as to achieve a smooth transition between the outer circle of the third convex ring 16 and the second side surface 14.

[0054] A partition 4 is provided in the middle of the end cover body 1, which not only effectively isolates the electromagnetic interference of the magnetic field generated by the motor stator to the rotary transformer stator, but also installs bearings and rotary transformers in the middle of the end cover body 1, making full use of the axial space of the end cover body 1 and improving the volumetric power density of the electric drive bridge.

[0055] The shaft hole of partition 4 is provided with an oil seal mounting cavity, which can reduce the impact of oil on the stator of the rotary transformer when the electric drive bridge is running.

[0056] The rotary transformer chamber is an oil-free or low-oil chamber, making it cleaner and more convenient to maintain and replace components such as the rotary transformer stator and temperature sensor harness during later maintenance.

[0057] The first cavity 2 also includes a wire harness fixing protrusion, which is used to fix the wire harness.

[0058] Optionally, the wire harness fixing protrusion can be used to fix the wire harness of the motor temperature sensor, the wire harness of the rotary transformer stator, and the grounding wire, and guide the direction of the wire harness.

[0059] Optionally, the wire harness fixing protrusion is disposed on the inner wall of the first protruding ring 12. Optionally, a space for fixing the wire harness is formed between two adjacent wire harness fixing protrusions, or the wire harness fixing protrusion has a groove for fixing the wire harness.

[0060] The wire harness fixing protrusion can be integrally formed with the end cap body 1, or the fixing component can be fixedly installed on the end cap body 1.

[0061] Secondly, this application discloses an electric drive bridge, including an end cover, which is the end cover described in any of the above-mentioned embodiments.

[0062] Since the end cap has the above-mentioned technical effects, the electric drive bridge with the end cap also has the same technical effects, which will not be elaborated here.

[0063] Thirdly, this application also discloses a motor vehicle, including an electric drive axle, wherein the electric drive axle is the electric drive axle described in the above-mentioned scheme.

[0064] Since the electric drive axle has the aforementioned technical effects, motor vehicles equipped with this electric drive axle also have the same technical effects, which will not be elaborated further here.

[0065] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed, and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. The scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An end cap, characterized in that, Includes an end cap body (1), the first end of the end cap body (1) in the axial direction includes a first cavity (2) for mounting a rotary transformer, and the second end of the end cap body (1) in the axial direction includes a second cavity (3) communicating with the housing of the motor. A partition (4) is provided in the middle of the end cap body (1) in the axial direction. The partition (4) is used to separate the first cavity (2) and the second cavity (3). The partition (4) includes a shaft hole that cooperates with the rotating shaft of the motor.

2. The end cap according to claim 1, characterized in that, The first cavity (2) includes a first side surface (11) located at the first end of the end cap body (1) and a first protruding ring (12) connected to the first side surface (11). The end of the first protruding ring (12) away from the first side surface (11) is connected to the shaft tube flange. The first side (11) has a mounting groove (13) that communicates with the first cavity (2), and a part of the rotor of the rotary transformer is located in the mounting groove (13).

3. The end cap according to claim 1, characterized in that, The second cavity (3) includes a second side surface (14) located at the second end of the end cap body (1) and a second protruding ring (15) connected to the second side surface (14), wherein one end of the second protruding ring (15) away from the second side surface (14) is connected to the housing; The second cavity (3) further includes a third convex ring (16) for mounting the bearing. The third convex ring (16) is located inside the second convex ring (15), and the annular space enclosed by the third convex ring (16) is in communication with the shaft hole.

4. The end cap according to claim 3, characterized in that, Along the axial direction of the end cap body (1), the length of the third protruding ring (16) is greater than the length of the second protruding ring (15).

5. The end cap according to claim 3 or 4, characterized in that, The outer diameter of the third convex ring (16) gradually increases from the end away from the second side surface (14) to the end closer to the second side surface (14).

6. The end cap according to any one of claims 1-4, characterized in that, The bore wall of the shaft hole includes an oil seal mounting cavity.

7. The end cap according to any one of claims 1-4, characterized in that, The first cavity (2) includes a wire harness fixing protrusion, which is used to fix the wire harness.

8. The end cap according to claim 7, characterized in that, A groove for securing the wire harness is formed between two adjacent wire harness fixing protrusions; or, The wire harness fixing protrusion includes a groove for fixing the wire harness.

9. An electric drive bridge, characterized in that, Includes an end cap, wherein the end cap is the end cap as described in any one of claims 1-8.

10. A motor vehicle, characterized in that, Includes an electric drive bridge, wherein the electric drive bridge is the electric drive bridge as described in claim 9.

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