unit

Abstract

This invention reduces vibration transmitted to an inverter. The unit includes: a planetary gear mechanism housed within a gear housing; an inverter housed within an inverter housing; and a connecting portion that connects the ring gear of the planetary gear mechanism to the inner wall of the gear housing. When viewed radially, the inverter housing overlaps with the gear housing. When viewed from the direction of the rotation axis, the connecting portion is not positioned between the rotation center of the planetary gear mechanism and the entire area of ​​the boundary between the inverter housing and the gear housing.

Description

Technical Field

[0001] This invention relates to units. Background Technology

[0002] Patent documents 1 and 2 disclose drive units for electric vehicles with planetary gear mechanisms.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2021 / 137281

[0006] Patent Document 2: Japanese Patent Application Publication No. 2011-252532 Summary of the Invention

[0007] The technical problem that the invention aims to solve

[0008] In the units described above, the inverter housing is mostly arranged so that it does not overlap with the gear housing in the radial direction. However, there are also cases where the inverter housing and the gear housing are arranged to overlap in the radial direction. In this case, the vibration generated by the planetary gear mechanism is transmitted to the inverter via the connection between the gear ring and the gear housing, and the boundary between the inverter housing and the gear housing.

[0009] The present invention was made in view of the technical problem that aims to reduce the vibration transmitted to the inverter.

[0010] Technical solutions for solving technical problems

[0011] According to one aspect of the invention, the unit comprises: a planetary gear mechanism housed in a gear housing chamber; an inverter housed in an inverter housing chamber; and a connecting portion that connects the gear ring of the planetary gear mechanism to the inner wall of the gear housing chamber, wherein, when viewed radially, the inverter housing chamber overlaps with the gear housing chamber, and when viewed from the direction of the rotation axis, the connecting portion is not disposed between the rotation center of the planetary gear mechanism and the entire area of ​​the boundary between the inverter housing chamber and the gear housing chamber.

[0012] Invention Effects

[0013] In the above configuration, no connecting portion is provided at the position closest to the inverter housing in the gear ring. 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

[0014] Figure 1 This is a schematic diagram of a unit according to the first embodiment of the present invention.

[0015] Figure 2 It is along Figure 1 The diagram shows the periphery of the planetary gear mechanism viewed in the direction of arrow II.

[0016] Figure 3 This is a diagram showing a first variation of the unit of the first embodiment.

[0017] Figure 4 This is a diagram showing a second variation of the unit of the first embodiment.

[0018] Figure 5 This is a diagram showing a third variation of the unit in the first embodiment.

[0019] Figure 6 This is a schematic diagram of a unit according to the second embodiment of the present invention.

[0020] Figure 7 It is along Figure 6 A schematic diagram showing the periphery of the planetary gear mechanism viewed in the direction of arrow VII.

[0021] Figure 8 This is a diagram used to illustrate the first method of fastening construction.

[0022] Figure 9 This is a diagram used to illustrate the second method of fastening construction.

[0023] Figure 10 This is a diagram used to illustrate a third-party fastening structure.

[0024] Figure 11 This is a diagram showing a first variation of the unit in the second embodiment.

[0025] Figure 12 This is a diagram showing a second variation of the unit in the second embodiment. Detailed Implementation

[0026] 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.

[0027] <First Implementation Method>

[0028] Figure 1 This is a schematic diagram of unit 100 according to the first embodiment of the present invention.

[0029] like Figure 1 As shown, the unit 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.

[0030] In unit 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 around 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.

[0031] In unit 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 unit 100 via drive shafts D1 and D2.

[0032] 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 so as not to rotate relative to the vehicle.

[0033] The inverter 2 is housed in the inverter housing 20 of the housing 1. The inverter housing 20 is arranged such that it overlaps at least with the gear housing 17 when viewed radially. 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 supporting the motor 3 when viewed radially.

[0034] "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".

[0035] 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".

[0036] 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 unit 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.

[0037] The electric motor 3 has a rotor 32 and a stator 33. The rotor 32 has a motor shaft 31. The rotor 32 is supported on the housing 1 via motor bearings 7 and 8. The stator 33 is fastened to the inner wall of the motor housing 11 by a plurality of bolts 9.

[0038] The motor bearing 8 is supported by the bearing core 10. The bearing cage 10 is fastened to the inner wall of the motor housing 11 by a plurality of bolts 12. The bearing roller 10 can also be applied to the motor bearing 7. The bearing liner 10 can be applied to either the motor bearings 7 and 8, or to both.

[0039] The planetary gear mechanism 5 is housed in the gear housing 17 of the housing 1. The planetary gear mechanism 5 is a stepping gear type planetary gear mechanism having a sun gear, multiple stepping gears (hereinafter referred to as pinions) P, a planet carrier C supporting the multiple pinions as rotatable, and a ring gear.

[0040] 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.

[0041] The sun gear S is connected to the motor shaft 31. 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.

[0042] Figure 2 It is along Figure 1 The schematic diagram shows the area surrounding planetary gear mechanism 5, viewed in the direction of arrow II. Figure 2 In this text, some structures have been omitted for ease of understanding.

[0043] like Figure 2 As shown, unit 100 has a plurality of mounting members 15 disposed on the outer wall of housing 1. The plurality of mounting members 15 connect housing 1 to vehicle body 300. The number of mounting members 15 is appropriately set. Figure 2 In the example shown, there are two mounting components 15. Furthermore, the planetary gear mechanism 5 has three pinions P.

[0044] The inverter housing 20 is connected to the gear housing 17 by bolts via a plurality of mounting portions 18 formed on the outer wall side of the housing 1.

[0045] Furthermore, unit 100 has a connecting portion that connects the gear ring R of planetary gear mechanism 5 to the inner wall of gear receiving chamber 17. That is, the gear ring R is fixed to the inner wall of gear receiving chamber 17 via the connecting portion. For example, as... Figure 2 As shown, the connecting part can be formed as a spline structure 50.

[0046] The spline structure 50 has: a plurality of spline teeth 51 formed on the outer periphery of the gear ring R; and a plurality of spline grooves 52 formed on the inner wall of the gear receiving chamber 17.

[0047] In addition, in this embodiment, such as Figure 1 As shown, the inverter housing 20 and the gear housing 17 are arranged to overlap radially. In this case, the vibration generated by the planetary gear mechanism 5 is transmitted to the inverter 2 via the connection between the gear ring R and the gear housing 17 and the boundary between the inverter housing 20 and the gear housing 17.

[0048] Therefore, in Figure 2 In the example shown, when viewed from the rotation axis X direction, no spline structure 50 as a connecting part is configured between the rotation center (rotation axis X) of the planetary gear mechanism 5 and the entire area of ​​the boundary between the inverter housing 20 and the gear housing 17. 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 spline structure 50 to the inverter housing 20.

[0049] That is, a missing tooth portion 53 is formed on the outer periphery of the gear ring R, which is a non-connecting portion where the spline structure 50 does not exist. When viewed from the rotation axis X, the missing tooth portion 53 is arranged between the rotation center of the planetary gear mechanism 5 and the entire area of ​​the boundary between the inverter housing 20 and the gear housing 17. In other words, when the inverter housing 20 and the gear ring R overlap radially, when viewed from the rotation center of the planetary gear mechanism 5, the entire area of ​​the boundary between the inverter housing 20 and the gear housing 17 does not overlap with the connecting portion. In addition, the interval (circumferential length) between adjacent spline teeth 51 in the spline structure 50 is smaller than the circumferential length of the missing tooth portion 53. That is, there is no missing tooth portion 53 between adjacent spline teeth 51 in the spline structure 50.

[0050] The non-connecting portion (toothless portion 53) can be appropriately set considering the position, number, and range of the boundary portion. Figure 2 In the example shown, a missing tooth portion 53 is provided.

[0051] As explained above, in unit 100 of this embodiment, no connecting portion is provided at the position closest to the inverter housing 20 in the gear ring R. This extends the vibration transmission distance from the connecting portion to the inverter housing 20. Consequently, the vibration transmitted to the inverter 2 can be reduced.

[0052] Furthermore, when the connecting portion is formed as a spline structure 50, the above-mentioned structure can be provided by forming a toothed portion 53 that does not have a spline structure 50.

[0053] Next, a first variation of unit 100 of the first embodiment will be described.

[0054] Figure 3 This is a diagram illustrating a first modified example of unit 100 in the first embodiment. Figure 3 In this text, some structures have been omitted for ease of understanding. Figure 3 In the example shown, there are two mounting components 15. Furthermore, the planetary gear mechanism 5 has three pinions P. There is one toothed section 53.

[0055] exist Figure 3 In the example shown, with Figure 2 Similarly, in the example shown, when viewed from the rotation axis X direction, a toothed portion 53 is arranged between the rotation center of the planetary gear mechanism 5 and the entire area of ​​the boundary between the inverter housing 20 and the gear housing 17.

[0056] Thus, in Figure 3 In the example shown, no connection portion is provided at the position closest to the inverter housing 20 in the gear ring R. This extends the vibration transmission distance from the connection portion to the inverter housing 20, thereby reducing the vibration transmitted to the inverter 2.

[0057] exist Figure 3 In the example shown, the inverter housing 20 is located on the side with its rotation center relative to the planetary gear mechanism 5 (in... Figure 3 In the middle, the side above the dotted line passing through the rotation axis X is designated as the first side, and the side where the inverter housing 20 is not located relative to the rotation center of the planetary gear mechanism 5 is designated as the first side. Figure 3 In the case where the second side is located below the dotted line passing through the rotation axis X, a spline structure 50 is configured on both the first and second sides. Figure 2 The examples shown are different. Figure 2 In the example shown, spline configuration 50 is configured only on the second side.

[0058] Taking into account the vibration effect of the planetary gear mechanism 5, it is preferable to... Figure 2 As shown in the example, the connecting part is only provided on the second side, but as... Figure 3 As shown in the example, by providing a connecting part on the first side in a range that does not overlap with the boundary and has minimal impact on vibration, it is possible to simultaneously achieve the support performance of the gear ring R and reduce vibration.

[0059] Next, a second variation of unit 100 of the first embodiment will be described.

[0060] Figure 4 This is a diagram illustrating a second variation of unit 100 in the first embodiment. Figure 4 In this text, some structures have been omitted for ease of understanding. Figure 4In the example shown, there are two mounting components 15. Additionally, there are three pinions P in the planetary gear mechanism 5. There is one toothed section 53.

[0061] exist Figure 4 In the example shown, with Figure 2 Similarly, in the example shown, when viewed from the rotation axis X direction, a toothed portion 53 is arranged between the rotation center of the planetary gear mechanism 5 and the entire area of ​​the boundary between the inverter housing 20 and the gear housing 17.

[0062] Thus, in Figure 4 In the example shown, no connection portion is provided at the position closest to the inverter housing 20 in the gear ring R. This extends the vibration transmission distance from the connection portion to the inverter housing 20, thereby reducing the vibration transmitted to the inverter 2.

[0063] In addition, Figure 4 In the example shown, with Figure 3 Similarly, the example shown has spline configuration 50 on both the first and second sides.

[0064] Therefore, it is possible to simultaneously achieve the support performance of the gear ring R and reduce vibration.

[0065] From the viewpoint of achieving vibration reduction, the spline structure 50 on the first side is preferably positioned outside the area of ​​the V-shape formed by the boundary line (double-dotted line) of the junction (mounting part 18) of the inverter housing 20 and the gear housing 17 and the center of revolution (rotation axis X) of the pinion P. More preferably, it is positioned outside the junction (outside the two dashed lines) of the inverter housing 20 and the gear housing 17.

[0066] exist Figure 4 In the example shown, the spline structure 50 on the first side is positioned on the outer side (outside the two dashed lines) of the junction between the inverter housing 20 and the gear housing 17.

[0067] In addition, Figure 4 In the example shown, the planetary gear mechanism 5 has three pinions P, and the configuration angle α of the missing tooth portion 53 is less than or equal to the smallest configuration angle β among the three pinions P.

[0068] "The configuration angle of the missing tooth portion 53" refers to the angle of the vertex of the triangle formed by connecting the rotation center of the planetary gear mechanism 5 with the two boundary points (the two ends of the missing tooth portion 53 in the circumferential direction) between the rotation center of the planetary gear mechanism 5 and the two boundary points between the missing tooth portion 53 and the spline structure 50.

[0069] "The configuration angle of pinion P" refers to the angle of the vertex of the triangle formed by the rotation center of the planetary gear mechanism 5, the meshing vertex of pinion P and ring gear R, and the meshing vertex of other pinions P adjacent to pinion P and ring gear R, with the rotation center as the vertex.

[0070] When multiple pinions P are arranged at equal intervals, the "minimum configuration angle of pinion P" can be evaluated as all adjacent pinions P having the same and minimum configuration angle. When multiple pinions P are arranged at non-equal intervals, the "minimum configuration angle of pinion P" refers to the minimum configuration angle among adjacent pinions P.

[0071] During the revolution of pinion P, comparing the cases where pinion P is positioned opposite the missing tooth portion 53 and the cases where pinion P is positioned opposite the spline structure 50, the pinion P positioned opposite the spline structure 50 exhibits higher support performance. Therefore, it is preferable that as many pinions as possible are positioned opposite the spline structure 50 during the revolution of pinion P.

[0072] Therefore, if the configuration angles α and β are set as described above, two adjacent pinions P will not be simultaneously opposite a missing tooth portion 53, which can suppress the reduction of the support performance of the pinion P during revolution.

[0073] exist Figure 4 In the example shown, the three pinions P are arranged at equal intervals in the circumferential direction. Therefore, the arrangement angle α of the missing tooth portion 53 is 360 / 3 [°] or less. Thus, when the N pinions P are arranged at equal intervals in the circumferential direction, by setting the arrangement angle α of the missing tooth portion 53 to 360 / N [°] or less, the decrease in the support performance of the pinions P during revolution can be suppressed.

[0074] Next, a third variation of unit 100 of the first embodiment will be described.

[0075] Figure 5 This is a diagram illustrating a third variation of unit 100 in the first embodiment. Figure 5 In this text, some structures have been omitted for ease of understanding. Figure 5 In the example shown, there are two mounting components 15. Additionally, there are three pinions P in the planetary gear mechanism 5. There is one toothed section 53.

[0076] exist Figure 5 In the example shown, the inverter housing 20 and the gear housing 17 are integrally formed. Other structures are similar. Figure 4 The example shown is the same.

[0077] exist Figure 5In the example shown, with Figure 2 Similarly, in the example shown, when viewed from the rotation axis X direction, a toothed portion 53 is arranged between the rotation center of the planetary gear mechanism 5 and the entire area of ​​the boundary between the inverter housing 20 and the gear housing 17. Figure 5 In the example shown, the boundary is the entire area up to the bottom surface and the two side walls of the inverter housing 20.

[0078] Thus, in Figure 5 In the example shown, no connection portion is provided at the position closest to the inverter housing 20 in the gear ring R. This extends the vibration transmission distance from the connection portion to the inverter housing 20, thereby reducing the vibration transmitted to the inverter 2.

[0079] In addition, Figure 5 In the example shown, with Figure 3 Similarly, the example shown has spline configuration 50 on both the first and second sides.

[0080] Therefore, it is possible to simultaneously achieve the support performance of the gear ring R and reduce vibration.

[0081] exist Figure 5 In the example shown, from the viewpoint of achieving vibration reduction, the spline structure 50 on the first side is preferably positioned outside the V-shaped region formed by the boundary line (double-dotted line) of the junction of the inverter housing 20 and the gear housing 17 (the entire area up to the bottom surface and the two side walls of the inverter housing 20) and the center of revolution (rotation axis X) of the pinion P. More preferably, it is positioned outside the junction of the inverter housing 20 and the gear housing 17 (outside the two dashed lines).

[0082] exist Figure 5 In the example shown, the spline structure 50 on the first side is positioned on the outer side (outside the two dashed lines) of the junction between the inverter housing 20 and the gear housing 17.

[0083] In addition, Figure 5 In the example shown, the planetary gear mechanism 5 has three pinions P, and the configuration angle α of the missing tooth portion 53 is less than or equal to the smallest configuration angle β among the three pinions P.

[0084] Therefore, two adjacent pinions P will not be simultaneously opposite a missing tooth portion 53, which can suppress the reduction of the support performance of the pinion P during revolution.

[0085] <Second Implementation Method>

[0086] Next, the second embodiment of the present invention will be described.

[0087] Figure 6This is a schematic diagram of unit 200 according to the second embodiment of the present invention. (As shown...) Figure 6 As shown, in unit 200 of the second embodiment, the connection between the gear ring R of the planetary gear mechanism 5 and the inner wall of the gear housing 17 is formed as a fastening structure 60 that connects the gear ring R to the inner wall of the gear housing 17 via bolts 16, which serve as fastening members. Other structures are the same as those of unit 100 of the first embodiment.

[0088] "Fastening structure" refers to a protrusion protruding from the outer wall of the gear ring R and / or from the inner wall of the gear housing 17, etc., in which fastening components (such as bolts) are inserted to connect the gear ring R to the gear housing 17.

[0089] Figure 7 It is along Figure 6 A schematic diagram showing the periphery of planetary gear mechanism 5 viewed in the direction of arrow VII. Figure 7 In this text, some structures have been omitted for ease of understanding. Figure 8 This is a diagram used to illustrate the first embodiment of the fastening structure 60. Figure 9 This is a diagram used to illustrate the second method of fastening structure 60. Figure 10 This is a diagram used to illustrate the third-party model of the fastening structure 60.

[0090] In unit 200, the number of support components 15 and the number of pinions P are appropriately set. Figure 7 In the example shown, there are two mounting components 15. Furthermore, the planetary gear mechanism 5 has three pinions P.

[0091] exist Figure 7 In the example shown, the fastening structure 60 consists of two protrusions 61 extending from the outer wall of the gear ring R. The gear ring R is connected to the gear housing 17 by fastening the bolt 16 to the internal thread formed in the gear housing 17 by inserting the bolt 16 through the hole provided in the protrusion 61.

[0092] like Figure 7 , Figure 8 As shown, the fastening structure 60 can be either a protrusion 61 protruding from the outer wall of the gear ring R, or as shown in the diagram. Figure 9 The image shows a protrusion 62 protruding from the inner wall of the housing 1, which can also be... Figure 10 The diagram shows a protrusion 64 protruding from the inner wall of the housing 1 and a protrusion 63 protruding from the outer wall of the gear ring R. Figure 10 In the example shown, an internal thread is formed in the protrusion 64, but an internal thread can also be formed in the protrusion 63.

[0093] exist Figure 7In the example shown, when viewed from the rotation axis X direction, no fastening structure 60 as a connecting part is provided between the rotation center of the planetary gear mechanism 5 and the entire area of ​​the boundary between the inverter housing 20 and the gear housing 17.

[0094] That is, a missing tooth portion 53 is formed on the outer periphery of the gear ring R, which is a non-connecting part without a fastening structure 60. When viewed from the rotation axis X, the missing tooth portion 53 is arranged between the rotation center of the planetary gear mechanism 5 and the entire area of ​​the boundary between the inverter housing 20 and the gear housing 17. In other words, when the inverter housing 20 and the gear ring R overlap radially, when viewed from the rotation center of the planetary gear mechanism 5, the entire area of ​​the boundary between the inverter housing 20 and the gear housing 17 does not overlap with the connecting part.

[0095] The non-connecting portion (toothless portion 53) can be appropriately set considering the position, number, and range of the boundary portion. Figure 7 In the example shown, there are two missing teeth 53.

[0096] Thus, in Figure 7 In the example shown, no connection portion is provided in the gear ring R at the position closest to the inverter housing 20. This extends the vibration transmission distance from the connection portion to the inverter housing 20, thereby reducing the vibration transmitted to the inverter 2.

[0097] Furthermore, when the connecting portion is formed as a fastening structure 60, the above-mentioned structure can be provided by forming a toothed portion 53 without the fastening structure 60.

[0098] Next, a first variation of unit 200 of the second embodiment will be described.

[0099] Figure 11 This is a diagram illustrating a first modified example of unit 200 in the second embodiment. Figure 11 In this text, some structures have been omitted for ease of understanding. Figure 11 In the example shown, there are two mounting components 15. Furthermore, the planetary gear mechanism 5 has three pinions P.

[0100] exist Figure 11 In the example shown, the fastening structure 60 consists of three protrusions 61 extending from the outer wall of the gear ring R. There are three missing teeth 53.

[0101] exist Figure 11 In the example shown, with Figure 7Similarly, in the example shown, when viewed from the rotation axis X direction, a toothed portion 53 is arranged between the rotation center of the planetary gear mechanism 5 and the entire area of ​​the boundary between the inverter housing 20 and the gear housing 17.

[0102] Thus, in Figure 11 In the example shown, no connection portion is provided at the position closest to the inverter housing 20 in the gear ring R. This extends the vibration transmission distance from the connection portion to the inverter housing 20, thereby reducing the vibration transmitted to the inverter 2.

[0103] When the connection is formed as a fastening structure 60, such as Figure 11 As shown in the example, it is preferable to have three or more connection points (protrusions 61) connecting the gear ring R to the gear housing 17. Furthermore, it is preferable to have a third point on the second side.

[0104] Therefore, it is possible to improve the support performance of the gear ring R.

[0105] From the viewpoint of improving the support performance of the gear ring R, 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 12 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) of the inverter housing 20 and the gear housing 17 and the center of revolution (rotation axis X) of the pinion P, and more preferably located outside the junction (outside the two dashed lines) of the inverter housing 20 and the gear housing 17.

[0106] Figure 12 This is a diagram illustrating a second variation of unit 200 in the second embodiment. Figure 12 In this text, some structures have been omitted for ease of understanding. Figure 12 In the example shown, there are two mounting components 15. Furthermore, the planetary gear mechanism 5 has three pinions P.

[0107] exist Figure 12 In the example shown, the fastening structure 60 consists of three protrusions 61 extending from the outer wall of the gear ring R. Additionally, there are three missing teeth.

[0108] exist Figure 12 In the example shown, multiple connection points are arranged in a manner that is as close as possible to circumferentially equidistant, located on the outer side (outside the two dashed lines) of the junction between the inverter housing 20 and the gear housing 17.

[0109] Therefore, it is possible to simultaneously achieve the supporting performance of the gear ring R and reduce vibration.

[0110] Furthermore, although not shown in the figure, when the connecting part is formed as a fastening structure 60, when viewed from the rotation axis X direction, a toothed part 53 that is not provided with a fastening structure 60 can be arranged between the rotation center of the planetary gear mechanism 5 and the entire area of ​​the boundary between the inverter housing 20 and the gear housing 17, and multiple fastening structures 60 are provided without gaps in other areas.

[0111] In this case, for the structure other than the connecting part, the same structure as when the connecting part is formed as spline structure 50 can be used, and the same effect can be obtained.

[0112] In addition, in the unit 100 of the second embodiment, the inverter housing 20 and the gear housing 17 may also be integrally formed in the same way as the unit 100 of the first embodiment.

[0113] The main effects of units 100 and 200 in the embodiments of the present invention will be summarized and explained below.

[0114] (1) Units 100 and 200 have a planetary gear mechanism 5 housed in a gear housing 17, an inverter 2 housed in an inverter housing 20, and a connecting part (spline structure 50, fastening structure 60) connecting the gear ring R of the planetary gear mechanism 5 to the inner wall of the gear housing 17. When viewed from the radial direction, the inverter housing 20 overlaps with the gear housing 17. When viewed from the rotation axis X direction, no connecting part is provided between the rotation center (rotation axis X) of the planetary gear mechanism 5 and the entire area of ​​the boundary between the inverter housing 20 and the gear housing 17.

[0115] Therefore, no connection portion is provided in the gear ring R at the position closest to the inverter housing 20. This extends the vibration transmission distance from the connection portion to the inverter housing 20, thereby reducing the vibration transmitted to the inverter 2.

[0116] (2) In unit 100, the connecting part is formed as a spline structure 50 that meshes with the inner wall of the gear housing 17, and a tooth-deficient part 53 without the spline structure 50 is formed on the outer periphery of the gear ring R. When viewed from the direction of the rotation axis X, the tooth-deficient part 53 is arranged between the rotation center (rotation axis X) of the planetary gear mechanism 5 and the entire area of ​​the boundary between the inverter housing 20 and the gear housing 17.

[0117] When the connecting portion is formed as a spline structure 50, the above-mentioned structure can be provided by forming a toothed portion 53 that does not have a spline structure 50.

[0118] (3) In unit 200, the connecting part is formed as a fastening structure 60 connected to the inner wall of gear housing 17 via bolt 16, and a tooth-deficient part 53 without fastening structure 60 is formed on the outer periphery of gear ring R. When viewed from the direction of rotation axis X, the tooth-deficient part 53 is arranged between the rotation center (rotation axis X) of planetary gear mechanism 5 and the boundary of inverter housing 20 and gear housing 17.

[0119] When the connecting part is formed as a fastening structure 60, the above-mentioned structure can be provided by forming a toothed part 53 without the fastening structure 60.

[0120] (4) The planetary gear mechanism 5 has multiple pinions P that mesh with the gear ring R, and the configuration angle α of the missing tooth portion 53 is less than or equal to the minimum configuration angle β among the multiple pinions P.

[0121] Therefore, two adjacent pinions P will not simultaneously face a missing tooth portion 53, which can suppress the reduction of the support performance of the pinion P during revolution.

[0122] (5) In units 100 and 200, if the side on which the inverter housing 20 is arranged relative to the rotation center (rotation axis X) of the planetary gear mechanism 5 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 planetary gear mechanism 5 is designated as the second side, a connecting part (spline structure 50, fastening structure 60) is provided on both the first side and the second side.

[0123] Taking into account the impact of vibration on the planetary gear mechanism 5, it is preferable to provide a connecting part only on the second side. However, by providing a connecting part on the first side in a range that does not overlap with the boundary and where the impact of vibration is minimal, it is possible to simultaneously achieve the support performance of the gear ring R and reduce vibration.

[0124] 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.

[0125] For example, in Figures 2-5 , Figure 7 , Figure 11 , Figure 12 In this diagram, multiple pinions P are arranged at equal intervals in the circumferential direction. However, multiple pinions P can also be arranged at non-equal intervals in the circumferential direction.

[0126] Explanation of reference numerals in the attached figures

[0127] 2: Inverter

[0128] 5: Planetary gear mechanism

[0129] 16: Bolts (fastening components)

[0130] 17: Gear Reception Chamber

[0131] 20: Inverter housing

[0132] 50: Spline structure (connection part)

[0133] 53: Missing tooth section (non-connecting section)

[0134] 60: Fastening structure (connection part)

[0135] 100: Unit

[0136] 200: Unit

[0137] P: Stepper pinion (small gear)

[0138] R: Gear ring

[0139] X: Rotation axis (center of rotation)

[0140] α: Configuration angle

[0141] β: Minimum configuration angle

Claims

1. A unit, characterized in that, have: A planetary gear mechanism, housed within a gear housing chamber; The inverter is housed in an inverter housing. A connecting part connects the gear ring of the planetary gear mechanism to the inner wall of the gear housing chamber. When viewed radially, the inverter housing overlaps with the gear housing. When viewed from the direction of rotation axis, the connecting portion is not provided between the rotation center of the planetary gear mechanism and the entire area of ​​the boundary between the inverter housing and the gear housing.

2. The unit according to claim 1, characterized in that, The connecting portion is formed as a spline structure that meshes with the inner wall of the gear receiving chamber. A non-connecting portion without the spline structure is formed on the outer periphery of the gear ring. When viewed from the direction of the rotation axis, the non-connecting portion is arranged between the rotation center of the planetary gear mechanism and the entire area of ​​the boundary portion of the inverter housing and the gear housing.

3. The unit according to claim 1, characterized in that, The connecting portion is configured as a fastening structure that connects to the inner wall of the gear receiving chamber via a fastening member. A non-connecting portion without the aforementioned fastening structure is formed on the outer periphery of the gear ring. When viewed from the direction of the rotation axis, the non-connecting portion is arranged between the rotation center of the planetary gear mechanism and the entire area of ​​the boundary portion of the inverter housing and the gear housing.

4. The unit according to claim 2 or 3, characterized in that, The planetary gear mechanism has multiple pinions that mesh with the gear ring. The configuration angle of the non-connecting part is less than or equal to the smallest configuration angle among the plurality of pinions.

5. The unit according to claim 1, characterized in that, When the side where the inverter housing is located relative to the rotation center of the planetary gear mechanism is designated as the first side, and the side where the inverter housing is not located relative to the rotation center of the planetary gear mechanism is designated as the second side, the connecting portion is provided on both the first side and the second side.

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