assembly

Abstract

The present application reduces vibrations transmitted to an inverter. The assembly has: a motor housed in a motor housing chamber, a bearing that supports a shaft of the motor, and a bearing holder that supports the bearing; an inverter housed in an inverter housing chamber; a connecting portion that connects the bearing holder and a wall in the motor housing chamber, and in a case where viewed from a rotational axis direction, the connecting portion is not disposed between a rotational center of the motor and an entire region of a boundary portion of the inverter housing chamber and the motor housing chamber.

Description

Technical Field

[0001] This invention relates to components. Background Technology

[0002] Drive assemblies with bearing cages are disclosed in Patent Documents 1 through 3. In particular, a drive assembly for an electric vehicle is disclosed in Patent Document 1.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-128795

[0006] Patent Document 2: Japanese Patent Application Publication No. 10-281245

[0007] Patent Document 3: Japanese Patent Application Publication No. 2010-242951 Summary of the Invention

[0008] The technical problem that the invention aims to solve

[0009] In the aforementioned components, vibrations generated by the motor are transmitted to the inverter via the connection between the bearing cage and the motor housing, and the boundary between the motor housing and the inverter housing.

[0010] This invention was made in view of such technical problems, and its purpose is to reduce the vibration transmitted to the inverter.

[0011] Technical solutions for solving technical problems

[0012] According to one aspect of the invention, the assembly includes: an electric motor housed within an electric motor housing, a bearing supporting a shaft of the electric motor, and a bearing cage supporting the bearing; an inverter housed within an inverter housing; and a connecting portion connecting the bearing cage to the inner wall of the electric motor housing, wherein, when viewed from the direction of rotation axis, the connecting portion is not disposed between the rotation center of the electric motor and the entire area of ​​the boundary between the inverter housing and the electric motor housing.

[0013] Invention Effects

[0014] In the above configuration, no connecting portion is provided at the position closest to the inverter housing on the bearing cage. This extends the vibration transmission distance from the connecting portion to the inverter housing, thereby reducing the vibration transmitted to the inverter. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the components according to an embodiment of the present invention.

[0016] Figure 2 It is along Figure 1 The schematic diagram shows the periphery of the bearing cage, viewed in the direction of arrow II.

[0017] Figure 3 This is a diagram representing the first variant of the component.

[0018] Figure 4 This is a diagram representing the second variant of the component.

[0019] Figure 5 This is a diagram representing the third variation of the component. Detailed Implementation

[0020] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Throughout this specification, the same reference numerals are used to denote the same elements.

[0021] Figure 1 This is a schematic diagram of component 100 according to an embodiment of the present invention.

[0022] like Figure 1 As shown, component 100 has a housing 1, an inverter 2, a motor 3, a planetary gear mechanism 5 that reduces the output rotation of the motor 3 and inputs it to the differential mechanism 4, and drive shafts D1 and D2 as drive shafts.

[0023] In component 100, a planetary gear mechanism 5, a differential mechanism 4, and drive shafts D1 and D2 are arranged along the transmission path of the output rotation of the motor 3 about the rotation axis X. The rotation center of the motor 3, the planetary gear mechanism 5, the differential mechanism 4, and the drive shafts D1 and D2 is the rotation axis X.

[0024] In component 100, the output rotation of motor 3 is reduced by planetary gear mechanism 5 and input to differential mechanism 4, and then transmitted to the left and right drive wheels W of the vehicle equipped with component 100 via drive shafts D1 and D2.

[0025] The housing 1 is composed of one or more components. Inside the housing 1, there is an inverter 2, an electric motor 3, and power transmission mechanisms such as a differential mechanism 4 and a planetary gear mechanism 5. The housing 1 is fixed relative to the vehicle and cannot rotate by mounting components (not shown).

[0026] The inverter 2 is housed in the inverter housing 20 of the housing 1. In this embodiment, the inverter 2 and the inverter housing 20 overlap with the motor 3, the differential mechanism 4, the planetary gear mechanism 5, and the motor bearings 7 and 8 of the motor shaft 31 that supports the motor 3 when viewed radially.

[0027] "When viewed from a specified direction, element A and element B overlap" means that element A and element B are arranged in a specified direction (axial, radial, gravitational direction, etc.) and, when viewed from that specified direction, element A and element B at least partially overlap. "When viewed from a specified direction, element A and element B overlap" is synonymous with "Element A and element B overlap in a specified direction".

[0028] In contrast, "Element A and Element B do not overlap when viewed from a specified direction" means that Element A and Element B are not arranged in a specified direction (axial, radial, gravitational direction, vehicle travel direction, etc.), and there is no overlapping part between Element A and Element B when viewed from the specified direction. "Element A and Element B do not overlap when viewed from a specified direction" is synonymous with "Element A and Element B do not overlap in a specified direction".

[0029] The planetary gear mechanism 5 is housed in the gear storage chamber 17 of the housing 1. The planetary gear mechanism 5 is a stepped pinion planetary gear mechanism, which has a sun gear S, multiple stepped pinions (hereinafter referred to as pinions) P, a planet carrier C that supports the multiple pinions P as rotatable, and a gear ring R.

[0030] The sun gear S meshes with multiple pinions P (large and small gears), and these multiple pinions P (small pinions) mesh with the ring gear R. The number of pinions P is set appropriately. The planetary gear mechanism 5 can be a stepped pinion planetary gear mechanism, a single pinion planetary gear mechanism, or a double pinion planetary gear mechanism.

[0031] The sun gear S is connected to the motor shaft 31 of the electric motor 3. The gear ring R is fixed to the housing 1. The planet carrier C is connected to the differential mechanism 4. In addition, the planet carrier C is supported on the housing 1 via planet carrier bearings 13 and 14.

[0032] The electric motor 3 is housed in the motor housing 11 of the housing 1. The electric motor 3 is electrically connected to a battery (not shown) outside the assembly 100 via the inverter 2, and receives power from the battery to function as an electric motor. In addition, the electric motor 3 can also function as a generator.

[0033] The electric motor 3 has a rotor 32 and a stator 33. The rotor 32 has a motor shaft 31. The motor shaft 31 is supported by motor bearings 7 and 8 located within the motor housing 11. Figure 1 In the manner shown, the stator 33 is fastened to the inner wall of the motor housing 11 by a plurality of bolts 9.

[0034] The motor bearing 8 is supported by the bearing cage 10. Figure 1 In the manner shown, the bearing cage 10 is fastened to the inner wall of the motor housing 11 by a plurality of bolts 12.

[0035] The bearing cage 10 abuts against the outer ring of the motor bearing 8 in the axial direction and supports the motor bearing 8 in the axial direction. That is, the axial position of the motor bearing 8 is defined by the bearing cage 10. The bearing cage 10 can also be applied to the motor bearing 7. The bearing cage 10 can be applied to either the motor bearing 7 or 8, or to both.

[0036] Figure 2 It is along Figure 1 The schematic diagram shows the periphery of the bearing cage 10, viewed in the direction of arrow II. Figure 2 Some structures have been omitted for ease of understanding.

[0037] Component 100 has a connecting portion that connects the bearing cage 10 to the inner wall of the motor housing 11. That is, the bearing cage 10 is fixed to the inner wall of the motor housing 11 via the connecting portion. The connecting portion is, for example, as shown in... Figure 2 As shown, a fastening structure 40 can be formed to connect the bearing cage 10 to the inner wall of the motor housing 11 via bolts 12, which serve as fastening components.

[0038] "Fastening structure" refers to the hole 10a formed on the outer periphery of the bearing cage 10 for fastening components (e.g., bolts, etc.) to be inserted through, and the seat surface 10b formed around the hole 10a for the fastening components to be seated.

[0039] exist Figure 2 In the example shown, the bearing cage 10 and the motor housing 11 are connected by fastening the bolt 12 into the internal thread formed in the motor housing 11 by inserting the bolt 12 into the through hole 10a. Figure 2 In the example shown, there are two fastening structures 40, arranged at equal intervals in the circumferential direction. That is, the two fastening structures 40 are symmetrically arranged with the rotation center (rotation axis X) of the motor 3 as the center point. The number of fastening structures 40 can be appropriately set. Alternatively, multiple fastening structures 40 can also be arranged at non-equal intervals in the circumferential direction.

[0040] The inverter housing 20 is connected to the housing 1 by bolts via a plurality of mounting portions 18 formed on the outer wall side of the housing 1.

[0041] Therefore, the vibration generated by the motor 3 is transmitted to the inverter 2 through the connection between the bearing cage 10 and the motor housing 11, and the boundary between the motor housing 11 and the inverter housing 20.

[0042] In contrast, Figure 2In the example shown, in order to reduce the vibration transmitted from the bearing cage 10 to the inverter 2, when viewed from the rotation axis X direction, no fastening structure 40 as a connection is provided between the rotation center of the motor 3 (rotation axis X) and the entire area of ​​the boundary between the inverter housing 20 and the motor housing 11. Figure 2 In the example shown, the boundary portion is the base region of the mounting portion 18. The boundary portion constitutes the vibration transmission path from the fastening structure 40 to the inverter housing 20.

[0043] That is, a non-connecting portion 53 without a fastening structure 40 is formed on the outer periphery of the bearing cage 10. When viewed from the rotation axis X direction, the non-connecting portion 53 is arranged between the rotation center of the motor 3 and the entire area of ​​the boundary between the inverter housing 20 and the motor housing 11. When the inverter housing 20 and the motor housing 11 overlap radially, when viewed from the rotation center of the motor 3 on the radial outer periphery, the entire area of ​​the boundary between the inverter housing 20 and the motor housing 11 is in a state where it does not overlap with the connecting portion.

[0044] The non-connecting portion 53 can be appropriately set considering the location, number, and range of the boundary portion. Figure 2 In the example shown, two non-connected parts 53 are provided.

[0045] Thus, in the assembly 100 of this embodiment, no connecting portion is provided at the position closest to the inverter housing 20 on the bearing cage 10. This extends the distance of vibration transmission from the connecting portion to the inverter housing 20. Consequently, the vibration transmitted to the inverter 2 can be reduced.

[0046] Furthermore, when the connecting portion is formed as a fastening structure 40, the above-mentioned structure can be provided by forming a non-connecting portion 53 without fastening structure 40.

[0047] Next, a first modified example of component 100 will be described.

[0048] Figure 3 This is a diagram showing a first modified example of component 100. In Figure 3 In order to make it easier to understand, some structures have been omitted.

[0049] exist Figure 3 In the example shown, three fastening structures 40 are provided. Additionally, in Figure 3 In the example shown, there are 3 non-connecting parts 53.

[0050] exist Figure 3 In the example shown, with Figure 2Similarly, in the example shown, when viewed from the direction of the rotation axis X, a non-connection portion 53 is arranged between the rotation center (rotation axis X) of the motor 3 and the entire area of ​​the boundary between the inverter housing 20 and the motor housing 11.

[0051] Thus, in Figure 3 In the example shown, no connection is provided at the position closest to the inverter housing 20 on the bearing cage 10. This extends the distance of vibration transmission from the connection to the inverter housing 20, thus reducing the vibration transmitted to the inverter 2.

[0052] When the connection is formed as a fastening structure 40, such as Figure 3 As shown in the example, it is preferable to have three or more connection points between the connecting bearing cage 10 and the motor housing 11. Additionally, on the side where the inverter housing 20 is positioned relative to the rotation center of the motor 3 (in... Figure 3 In the middle, the side above the single-dot dashed line passing through the rotation axis X is designated as the first side, and the side without the inverter housing 20 is designated relative to the rotation center of the motor 3 (in Figure 3 In the case where the third point is set as the second side (the side lower than the single-dot line passing through the rotation axis X), the third point is preferably set on the second side.

[0053] This improves the support performance of the bearing cage 10.

[0054] Next, a second variation of component 100 will be described.

[0055] Figure 4 This is a diagram showing a second modified example of component 100. Figure 4 In order to make it easier to understand, some structures have been omitted.

[0056] exist Figure 4 In the example shown, three fastening structures 40 are provided. Additionally, in Figure 4 In the example shown, there are 3 non-connecting parts 53.

[0057] exist Figure 4 In the example shown, with Figure 2 Similarly, in the example shown, when viewed from the direction of the rotation axis X, a non-connection portion 53 is arranged between the rotation center (rotation axis X) of the motor 3 and the entire area of ​​the boundary between the inverter housing 20 and the motor housing 11.

[0058] Thus, in Figure 4In the example shown, no connection is provided at the position closest to the inverter housing 20 on the bearing cage 10. This extends the distance of vibration transmission from the connection to the inverter housing 20, thus reducing the vibration transmitted to the inverter 2.

[0059] In addition, Figure 4 In the example shown, on the side where the inverter housing 20 is located relative to the rotation center of the motor 3 (in Figure 4 In the middle, the side above the single-dot dashed line passing through the rotation axis X is designated as the first side, and the side without the inverter housing 20 is designated relative to the rotation center of the motor 3 (in Figure 4 In the case where the second side is located below the single-dot dashed line passing through the rotation axis X, a connecting part (fastening structure 40) is provided on both the first side and the second side.

[0060] When considering the impact of vibration, it is preferable to provide the connection part only on the second side. However, by providing the connection part on the first side in a range that does not overlap with the boundary part and where the impact of vibration is less, it is possible to simultaneously achieve the support performance of the bearing cage 10 and the reduction of vibration.

[0061] Here, when the connection is formed as a fastening structure 40, from the viewpoint of improving the support performance of the bearing cage 10, it is preferable to arrange multiple connection points at equal intervals in the circumferential direction. On the other hand, from the viewpoint of reducing vibration, such as Figure 4 As shown, the connection point on the first side is preferably located outside the V-shaped area formed by the boundary line (double-dotted line) of the junction (mounting part 18) between the inverter housing 20 and the motor housing 11 and the rotation center (rotation axis X) of the motor 3.

[0062] exist Figure 4 In the example shown, multiple connection points are arranged in a manner that is as close as possible to circumferentially equidistant on the outside of the V-shaped area formed by the boundary line (double-dotted line) of the junction (mounting part 18) of the inverter housing 20 and the motor housing 11 and the rotation center (rotation axis X) of the motor 3.

[0063] Next, a third variation of component 100 will be described.

[0064] Figure 5 This is a diagram showing a third variation of component 100 according to the first embodiment. Figure 5 In order to make it easier to understand, some structures have been omitted.

[0065] exist Figure 5 In the example shown, the inverter housing 20 and the motor housing 11 are integrally formed. Other constructions are similar. Figure 4 The example shown is the same.

[0066] exist Figure 5 In the example shown, with Figure 2 Similarly, in the example shown, when viewed from the rotation axis X direction, a non-connecting portion 53 is arranged between the rotation center (rotation axis X) of the motor 3 and the entire area of ​​the boundary between the inverter housing 20 and the motor housing 11. Figure 5 In the example shown, the boundary is the entire area extending to the bottom and side walls of the inverter housing 20.

[0067] Thus, in Figure 5 In the example shown, no connection is provided at the position closest to the inverter housing 20 on the bearing cage 10. This extends the distance of vibration transmission from the connection to the inverter housing 20, thus reducing the vibration transmitted to the inverter 2.

[0068] In addition, Figure 5 In the example shown, with Figure 4 Similarly, in the example shown, fastening structures 40 are provided on both the first and second sides.

[0069] Therefore, it is possible to simultaneously achieve the support performance of the bearing cage 10 and reduce vibration.

[0070] In addition, Figure 5 In the example shown, with Figure 4 Similarly, in the example shown, multiple connection points are arranged in a manner that is as close as possible to circumferentially equidistant, outside the V-shaped area formed by the boundary line (double-dotted line) of the junction of the inverter housing 20 and the motor housing 11 and the rotation center (rotation axis X) of the motor 3.

[0071] The main effects of component 100 in the embodiments of the present invention will be summarized below.

[0072] (1) The component 100 includes: a motor 3 housed in a motor housing 11, a motor bearing 8 supporting a motor shaft 31 of the motor 3, and a bearing cage 10 supporting the motor bearing 8; an inverter 2 housed in an inverter housing 20; and a connection (fastening structure 40) that connects the bearing cage 10 to the inner wall of the motor housing 11. When viewed from the rotation axis X direction, no connection is provided between the rotation center (rotation axis X) of the motor 3 and the entire area of ​​the boundary between the inverter housing 20 and the motor housing 11.

[0073] Therefore, no connection portion is provided at the position closest to the inverter housing 20 on the bearing cage 10. This extends the vibration transmission distance from the connection portion to the inverter housing 20, thereby reducing the vibration transmitted to the inverter 2.

[0074] (2) The connection part is formed as a fastening structure 40 connected to the inner wall of the motor housing 11 via bolt 16. A non-connection part 53 without fastening structure 40 is formed on the outer periphery of the bearing cage 10. When viewed from the rotation axis X direction, the non-connection part 53 is arranged between the rotation center (rotation axis X) of the motor 3 and the entire area of ​​the boundary between the inverter housing 20 and the motor housing 11.

[0075] When the connecting part is formed as a fastening structure 40, the above-mentioned structure can be provided by forming a non-connecting part 53 that does not have a fastening structure 40.

[0076] (3) In the assembly 100 (second modification, third modification), when the side on which the inverter housing 20 is arranged relative to the rotation center (rotation axis X) of the motor 3 is designated as the first side and the side on which the inverter housing 20 is not arranged relative to the rotation center of the motor 3 is designated as the second side, a connecting part (fastening structure 40) is provided on both the first side and the second side.

[0077] When considering the impact of vibration, it is preferable to provide the connection part only on the second side. However, by providing the connection part on the first side in a range that does not overlap with the boundary part and where the impact of vibration is less, it is possible to simultaneously achieve the support performance of the bearing cage 10 and the reduction of vibration.

[0078] The embodiments of the present invention have been described above, but the above embodiments only show a part of the application examples of the present invention, and the technical scope of the present invention is not limited to the specific structure of the above embodiments.

[0079] For example, in the above embodiment, component 100 is a single-axis drive component having a planetary gear mechanism 5. However, component 100 may also not have a planetary gear mechanism 5. Component 100 may be a dual-axis drive component or a three-axis drive component.

[0080] Explanation of reference numerals in the attached figures

[0081] 2: Inverter

[0082] 3: Electric motor

[0083] 8: Electric motor bearings (bearings)

[0084] 10: Bearing cage

[0085] 11: Electric motor storage room

[0086] 12: Bolts (fastening components)

[0087] 20: Inverter storage room

[0088] 31: Motor shaft (shaft)

[0089] 40: Fastening structure (connection part)

[0090] 53: Non-connecting parts

[0091] 100: Components

[0092] X: Rotation axis (center of rotation)

Claims

1. A component, characterized in that, have: The electric motor, the bearing supporting the shaft of the electric motor, and the bearing cage supporting the bearing are housed in the electric motor housing. The inverter is housed in the inverter storage compartment. A connecting part connects the bearing cage to the inner wall of the motor housing chamber. When viewed from the direction of the rotation axis, the connecting portion is not provided between the rotation center of the motor and the entire area of ​​the boundary between the inverter housing and the motor housing.

2. The component according to claim 1, characterized in that, The connection portion is configured to be fastened to the inner wall of the motor housing chamber via a fastening component. A non-connecting portion, where the fastening structure is absent, is formed on the outer periphery of the bearing cage. When viewed from the direction of the rotation axis, the non-connecting portion is arranged between the rotation center of the motor and the entire area of ​​the boundary portion of the inverter housing and the motor housing.

3. The component according to claim 1 or 2, characterized in that, When the side where the inverter housing is located relative to the rotation center of the motor is designated as the first side, and the side where the inverter housing is not located relative to the rotation center of the motor is designated as the second side, the connecting portion is provided on both the first side and the second side.

Images