Assembly

Abstract

The invention provides an assembly which can contribute to miniaturization. The assembly includes a rotating electrical machine, a planetary gear mechanism connected to the downstream of the rotating electrical machine, a first gear connected to the downstream of the planetary gear mechanism, a second gear engaged with the first gear, and a third gear connected to the downstream of the second gear, the rotating electrical machine, the planetary gear mechanism, and the first gear being disposed on a first shaft. The second gear and the third gear are disposed on the second shaft, and the third gear has a portion sandwiched between the planetary gear mechanism and the second gear.

Description

Technical Field

[0001] The invention relates to an assembly. Background Art

[0002] Patent Document 1 discloses a module including a speed reduction mechanism.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2022-33113 Summary of the invention

[0006] An object of the present invention is to provide a component that can contribute to miniaturization.

[0007] According to one embodiment of the present invention, a component is provided, comprising: a rotating motor, a planetary gear mechanism connected downstream of the rotating motor, a first gear connected downstream of the planetary gear mechanism, a second gear meshing with the first gear, and a third gear connected downstream of the second gear, wherein the rotating motor, the planetary gear mechanism and the first gear are arranged on a first shaft, the second gear and the third gear are arranged on a second shaft, and the third gear has a portion clamped between the planetary gear mechanism and the second gear.

[0008] Effects of the Invention

[0009] According to one aspect of the present invention, it is possible to contribute to miniaturization of a component. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic structural diagram of the components of this embodiment.

[0011] Figure 2 It is a longitudinal sectional view showing the positional relationship between the inverter and the planetary gear mechanism. DETAILED DESCRIPTION

[0012] Hereinafter, an embodiment of the present invention (hereinafter simply referred to as the present embodiment) will be described with reference to the drawings.

[0013] First, refer to Figure 1 and Figure 2 The assembly 1 of this embodiment will be described. In addition, in this specification, the same reference numerals are attached to the same components throughout.

[0014] Figure 1 It is a schematic structural diagram of the assembly 1 of this embodiment. Figure 2 It is a longitudinal sectional view showing the positional relationship between the inverter 4 and the planetary gear mechanism 51 .

[0015] Figure 1 and Figure 2 The component 1 shown is used to drive the driving wheels of the vehicle (not shown), but is not limited to this. For example, it can also be used to drive electrical products. The component 1 can also be called a motor component (a component having at least a motor), a power transmission device (a device having at least a power transmission mechanism (for example, a gear mechanism and / or a differential gear mechanism, etc.)), etc. In addition, a device (component) having a motor and a power transmission mechanism belongs to the concept of both a motor component and a power transmission device. Specifically, the component 1 has: a housing 2, a motor 3 as a rotating motor, an inverter 4, a reduction gear set 5 as a power transmission mechanism, and a drive shaft 6.

[0016] The housing 2 is a housing component for housing the motor 3, the inverter 4, the reduction gear set 5, and the drive shaft 6. The housing 2 is composed of one or more housings. Specifically, the housing 2 is composed of a first housing 21, a second housing 22, a third housing 23 as a third wall portion, a fourth housing 24, and a fifth housing 25 (see Figure 2 )constitute.

[0017] The first housing 21 is a 3-in-1 component. 3-in-1 means that a part of the motor housing that accommodates the motor 3 and the drive shaft 6 and a part of the inverter housing that accommodates the inverter 4 are integrally formed.

[0018] The first housing 21 has a cylinder 211 which is opened at least at the front end as one end; a front flange 212 which is protruded toward the outer circumference at the front end of the cylinder 211; a rear flange 213 which is protruded toward the outer circumference at the rear end as the other end of the cylinder 211; and a support frame 214 which is arranged on the inner circumference of the cylinder 211 so as to be located at the rear end of the cylinder 211. Here, the axial direction X refers to the axial direction X of the rotation axis of the components constituting the assembly 1. The components are, for example, the motor 3, the gear mechanism, and the differential gear mechanism.

[0019] The support frame 214 has: an annular wall 214a, which serves as a first wall portion to fix the ring gear 513 of the planetary gear mechanism 51 described later of the reduction gear group 5; a first support wall 214b, which is configured to be located closer to the front end side of the tube 211 than the annular wall 214a and to support the bearing B1; and a second support wall 214c, which is configured as a second wall portion to be arranged in parallel with the annular wall 214a in the lateral direction Y as the first radial direction and to support the bearing B2 as the first bearing.

[0020] The first support wall 214b supports the rear end of the other end of the rotating shaft 31 of the motor 3 via the bearing B1. The second support wall 214c supports the front end of one end of the differential gear 56 of the reduction gear set 5 as the differential gear mechanism described later (specifically, the front end of the differential case 561 of the differential gear 56 described later) via the bearing B2 so that it can rotate freely.

[0021] In addition, the annular wall 214a, the first support wall 214b, and the second support wall 214c are integrally formed. This eliminates the need to separately form components constituting the support frame 214, thereby suppressing an increase in the number of components.

[0022] The second housing 22 is connected to the front end of the cylinder 211 of the first housing 21. Specifically, the outer periphery of the second housing 22 is connected to the front flange 212 by bolt fastening. In addition, the second housing 22 supports both the bearings B3 and B4. Moreover, the second housing 22 supports both the front end of one end of the rotating shaft 31 of the motor 3 and the front end of one end of the drive shaft 6 (specifically, the first drive shaft 61 constituting the drive shaft 6) through the bearing B3 and the bearing B4 so that they can rotate freely.

[0023] The third housing 23 is arranged on the inner peripheral side of the cylinder 211 in a manner to be located at the rear end of the cylinder 211. The third housing 23 is formed separately from the support frame 214. In addition, the third housing 23 is connected to the support frame 214. Specifically, the outer periphery of the third housing 23 is connected to the rear end of the annular wall 214a of the support frame 214 by bolt fastening so that it is located in the area inside the first housing 21.

[0024] The third housing 23 supports: a bearing B5 as a second bearing, which supports the front end of one end of the first shaft 7 that rotates integrally with the first gear 52 described later of the reduction gear set 5; and a bearing B6 as a third bearing, which supports the front end of one end of the second shaft 8 that rotates integrally with the third gear 54 described later of the reduction gear set 5. The third housing 23 supports the front ends of the first shaft 7 and the second shaft 8 via the bearing B5 and the bearing B6, respectively, so that they can rotate freely.

[0025] The fourth housing 24 accommodates the reduction gear set 5. The fourth housing 24 is composed of a bottomed cylinder with an open front end as one end and a closed rear end as the other end. In addition, the fourth housing 24 is connected to the rear end of the cylinder 211. Specifically, the outer periphery of the front end of the fourth housing 24 is connected to the rear flange 213 by bolt fastening.

[0026] The fourth housing 24 supports: a bearing B7 supporting the rear end of the other end of the first shaft 7, a bearing B8 supporting the rear end of the other end of the second shaft 8, and a bearing B9 supporting the rear end of the other end of the differential gear 56 (specifically, the rear end of the differential housing 551). The fourth housing 24 supports the rear end of the first shaft 7, the rear end of the second shaft 8, and the rear end of the differential gear 56 via the bearing B7, the bearing B8, and the bearing B9, respectively, so that they can rotate freely.

[0027] The bearings B3, B1, B5, and B7 are arranged in sequence from the front side to the rear side along the axial direction X. The bearings B6 and B8 are arranged in sequence from the front side to the rear side along the axial direction X. The bearings B4, B2, and B9 are arranged in sequence from the front side to the rear side along the axial direction X.

[0028] The bearing B2 is disposed between the bearing B1 and the bearing B5. The bearing B9 is disposed between the bearing B5 (or B6) and the bearing B7 (or B8).

[0029] like Figure 2 As shown, the fifth housing 25 is surrounded by the cylinder 211, the front flange 212 and the rear flange 213 of the first housing 21, and blocks the opening of the inverter housing chamber S1 housing the inverter 4. The fifth housing 25 is fastened to the front flange 212 and the rear flange 213 by bolts.

[0030] The motor 3 is a rotating electrical machine having a motor function and / or a generator function. The motor 3 includes: a rotating shaft 31 rotatably supported by the first housing 21 and the second housing 22 via bearings B3 and B1, a rotor 32 located on the outer circumference of the rotating shaft 31 and rotating integrally with the rotating shaft 31, and a stator 33 fixed to the inner circumference of the cylinder 211 in a manner located on the outer circumference of the rotor 32.

[0031] The inverter 4 is a controller for controlling the driving of the motor 3. The inverter 4 is housed in the inverter housing chamber S1 so as to extend along the axial direction X.

[0032] The reduction gear set 5 is a power transmission mechanism that reduces the power of the motor 3 and transmits it to the drive shaft 6, and is composed of a plurality of gears. The reduction gear set 5 is connected to the downstream power of the motor 3 and to the upstream power of the drive shaft 6. The reduction gear set 5 is housed in a reduction gear set housing chamber S2 formed by the first housing 21, the third housing 23, and the fourth housing 24.

[0033] like Figure 1As shown, the reduction gear set 5 has a planetary gear mechanism 51, a first gear 52, a second gear 53, a third gear 54, a fourth gear 55, and a differential gear 56, which are sequentially arranged from upstream to downstream as the first element or the second element. Moreover, the power from the motor 3 is transmitted to the drive shaft 6 via the planetary gear mechanism 51, the first gear 52, the second gear 53, the third gear 54, the fourth gear 55, and the differential gear 56 in sequence.

[0034] Hereinafter, the second element (component, part, etc.) connected to the first element (component, part, etc.) / the second element (component, part, etc.) connected downstream of the first element (component, part, etc.) / the second element (component, part, etc.) connected upstream of the first element (component, part, etc.) means that the first element and the second element are connected in a manner capable of transmitting power. The input side of the power is the upstream, and the output side of the power is the downstream. In addition, the connection can also be made via other mechanisms (such as clutches, other gear mechanisms, etc.).

[0035] The planetary gear mechanism 51 is connected downstream of the motor 3. The planetary gear mechanism 51 is housed on the inner circumference side of the annular wall 214a in such a manner that the front side and the rear side are respectively opposite to the first support wall 214b and the third housing 23. That is, the planetary gear mechanism 51 is arranged in a region surrounded by the annular wall 214a, the first support wall 214b and the third housing 23.

[0036] Thus, after the planetary gear mechanism 51 is mounted on the annular wall 214a, the third housing 23, the first gear 52, the second gear 53, the third gear 54, etc., which are separate from the first housing 21, can be mounted, so that an easily assembled housing structure can be formed.

[0037] In addition, the planetary gear mechanism 51 is not located in the area inside the fourth housing 24, but is located only in the area inside the first housing 21. Therefore, compared with a structure in which the planetary gear mechanism 51 is arranged in the area inside the fourth housing 24, the first gear 52 and the second gear 53 can be arranged closer to the motor 3 side in the axial direction X. As a result, it is possible to contribute to the miniaturization of the assembly 1 (particularly in the axial direction X).

[0038] In addition, the planetary gear mechanism 51 overlaps with the inverter housing chamber S1 when viewed in the radial direction. That is, the planetary gear mechanism 51 and the inverter housing chamber S1 are arranged in the longitudinal direction Z which is the second radial direction orthogonal to the lateral direction Y.

[0039] In other words, in radial view, the inverter housing chamber S1 has a portion overlapping with the planetary gear mechanism 51. Thus, a space is generated radially outside the space where the planetary gear mechanism 51 is arranged, and by forming the inverter housing chamber S1 in this space, the space can be effectively utilized, thereby contributing to the miniaturization of the entire assembly 1.

[0040] The planetary gear mechanism 51 includes a sun gear 511, a planetary gear carrier 512, and a ring gear 513. A pinion gear set 514 is disposed between the sun gear 511 and the ring gear 513 and meshes with both the sun gear 511 and the ring gear 513. The ring gear 513 is fixed to the inner periphery of the annular wall 214a in a non-rotatable manner. The pinion gear set 514 is rotatably supported on the planetary gear carrier 512.

[0041] The sun gear 511 is connected to the rear end of the rotating shaft 31 so as to rotate integrally with the rotating shaft 31. The planetary gear carrier 512 is connected to the front end of the first shaft 7 so as to rotate integrally with the first shaft 7. The first shaft 7 is rotatably supported by the third housing 23 and the fourth housing 24 via the bearings B5 and B7. Moreover, the axis of the rotating shaft 31 and the axis of the first shaft 7 are both the axis C1 serving as the first shaft. In this way, by arranging the planetary gear mechanism 51 coaxially with the rotating shaft 31 of the motor 3, a high speed ratio can be achieved, and compared with a structure in which the planetary gear mechanism 51 is not coaxially arranged with the rotating shaft 31, the radial expansion of the component 1 can be suppressed.

[0042] The first gear 52 is connected to the downstream of the planetary gear mechanism 51 in a manner closer to the bearing B7 than the bearing B5. The first gear 52 is formed on the outer periphery of the first shaft 7 in a manner that rotates integrally with the first shaft 7. Moreover, the motor 3, the planetary gear mechanism 51 and the first gear 52 are coaxially arranged with the axis C1. Thus, by coaxially arranging the planetary gear mechanism 51 between the first gear 52 as the first-stage gear and the motor 3, it is possible to suppress the radial expansion of the assembly 1.

[0043] The second gear 53 meshes with the first gear 52. The second gear 53 has a larger number of teeth than the first gear 52, and together with the first gear 52, it forms a first reduction gear stage. The second gear 53 is connected to the outer periphery of the second shaft 8 so as to rotate integrally with the second shaft 8. In addition, the second shaft 8 is rotatably supported by the third housing 23 and the fourth housing 24 via the bearings B6 and B8 in a manner parallel to the first shaft 7 and located between the first shaft 7 and the drive shaft 6.

[0044] The third gear 54 is connected downstream of the second gear 53 so as to be closer to the bearing B6 than the bearing B8. The third gear 54 is formed on the outer periphery of the second shaft 8 so as to rotate integrally with the second shaft 8. That is, the second gear 53 and the third gear 54 are coaxially arranged on the axis C2 of the second shaft 8 as the second shaft.

[0045] In addition, the third gear 54 is located between the planetary gear mechanism 51 and the second gear 53. That is, the third gear 54 has a portion that is clamped between the planetary gear mechanism 51 and the second gear 53. Therefore, compared with a structure in which the second gear 53 is located between the planetary gear mechanism 51 and the third gear 54, it is possible to suppress expansion of the assembly 1 in the axial direction X and the radial directions Y and Z.

[0046] In addition, when viewed in the axial direction, the planetary gear mechanism 51 overlaps with the second gear 53 and the third gear 54. That is, the planetary gear mechanism 51, the second gear 53 and the third gear 54 are arranged in the axial direction X.

[0047] In other words, when viewed in the axial direction, the planetary gear mechanism 51 has a portion overlapping the second gear 53 and the third gear 54. This allows the space of the reduction gear train storage chamber S2 to be effectively utilized, thereby contributing to the miniaturization of the entire assembly 1.

[0048] The fourth gear 55 meshes with the third gear 54. The fourth gear 55 has a larger number of teeth than the third gear 54, and together with the third gear 54, it forms a second reduction gear stage. In the reduction gear set 5, two-stage reduction is performed by the first gear 52 and the second gear 53 and the third gear 54 and the fourth gear 55. Thus, while ensuring the reduction ratio, the reduction gear diameter can be reduced compared to the one-stage reduction.

[0049] The differential gear 56 is connected downstream of the fourth gear 55. The differential gear 56 has a differential case 561 and a differential portion 562.

[0050] The differential case 561 accommodates the differential portion 562. The differential case 561 is rotatably supported by the first case 21 and the fourth case 24 via the bearing B2 and the bearing B9. The differential case 561 is connected to the inner periphery of the fourth gear 55 so as to rotate integrally therewith.

[0051] The differential portion 562 transmits the power transmitted to the differential case 561 via the fourth gear 55 to the drive shaft 6 .

[0052] The drive shaft 6 rotates integrally with the drive wheels of the vehicle. The drive shaft 6 is connected downstream of the differential gear 56 in a manner parallel to the rotation axis 31. In addition, the drive shaft 6 has: a first drive shaft 61 connected to one drive wheel, and a second drive shaft 62 connected to the other drive wheel. The axis of the first drive shaft 61 and the axis of the second drive shaft 62 are both the axis C3 serving as the third axis.

[0053] The fourth gear 55 and the differential gear 56 are arranged coaxially with the axis C3. The differential gear 56 is arranged closer to the planetary gear mechanism 51 than the fourth gear 55. That is, the differential gear 56 has a portion located between the planetary gear mechanism 51 and the fourth gear 55.

[0054] Thus, a space is generated radially outside the space where the planetary gear mechanism 51 is arranged, and by arranging the differential gear 56 in this space, the space can be effectively utilized, thereby contributing to downsizing of the assembly 1 .

[0055] The differential gear 56 overlaps with the third housing 23 when viewed in the radial direction. That is, the differential gear 56 and the third housing 23 are arranged in the lateral direction Y.

[0056] In other words, when viewed in the radial direction, the differential gear 56 has a portion that overlaps with the third housing 23. As a result, an opening as a space surrounded by the first housing 21 and the third housing 23 is generated radially outside the space where the third housing 23 is arranged, and by forming the differential gear 56 to pass through the opening (that is, the differential gear 56 is arranged in both the area inside the first housing 21 and the area inside the fourth housing 24), the space formed by the opening can be effectively utilized, so compared with a structure in which the differential gear 56 is arranged only in the area inside the fourth housing 24, the assembly 1 can be miniaturized (especially in the axial direction X).

[0057] By increasing the speed ratio of the reduction gear set 5 as a whole (the speed ratio and the reduction ratio are inversely proportional, so the reduction ratio becomes smaller), the maximum torque required by the motor 3 can be reduced, which can contribute to the miniaturization of the motor 3. In addition, in order to increase the speed ratio, the number of decelerations is increased by adding the planetary gear mechanism 51, so that the differential diameter can be reduced (proportional to the diameter of the fourth gear 55, which is a reduction gear that rotates integrally with the differential gear 56), so the layout becomes easier.

[0058] (Effect)

[0059] Next, the main effects of this embodiment will be described.

[0060] (1) The assembly 1 of the present embodiment includes: the motor 3 (rotating electric machine), the planetary gear mechanism 51 connected to the downstream of the motor 3 (rotating electric machine), the first gear 52 connected to the downstream of the planetary gear mechanism 51, the second gear 53 meshing with the first gear 52, and the third gear 54 connected to the downstream of the second gear 53. The motor 3 (rotating electric machine), the planetary gear mechanism 51 and the first gear 52 are arranged on the axis C1 (first axis), the second gear 53 and the third gear 54 are arranged on the axis C2 (second axis), and the third gear 54 has a portion sandwiched between the planetary gear mechanism 51 and the second gear 53.

[0061] According to this structure, the planetary gear mechanism 51 is coaxially provided between the first gear 52 as the first-stage gear and the motor 3, so that the component 1 can be suppressed from expanding in the radial direction. In addition, since the third gear 54 is sandwiched between the planetary gear mechanism 51 and the second gear 53, it is possible to suppress the component 1 from expanding in the axial direction X and the radial directions Y and Z. As a result, it is possible to contribute to the miniaturization of the component 1.

[0062] (2) Component 1 also includes: a fourth gear 55 meshing with the third gear 54, a differential gear 56 connected to the downstream of the fourth gear 55, and a drive shaft 6 connected to the downstream of the differential gear 56, the fourth gear 55 and the differential gear 56 are arranged on the axis C3, and the differential gear 56 is arranged on the side of the planetary gear mechanism 51 than the fourth gear 55.

[0063] According to this configuration, a space is generated radially outside the space where the planetary gear mechanism 51 is arranged, and by arranging the differential gear 56 in this space, the space can be effectively utilized, thereby contributing to miniaturization of the assembly 1 .

[0064] (3) Component 1 also includes: an annular wall 214a (first wall portion) for fixing the ring gear 513 of the planetary gear mechanism 51; and a second supporting wall 214c (second wall portion) for supporting the bearing B2 (first bearing) supporting the differential gear 56, and the annular wall 214a (first wall portion) and the second supporting wall 214c (second wall portion) are formed integrally.

[0065] According to this configuration, it is not necessary to separately form the components constituting the support frame 214, and thus it is possible to suppress an increase in the number of components.

[0066] (4) Component 1 also has a third housing 23 (third wall portion) opposite to the planetary gear mechanism 51, and the third housing 23 (third wall portion) is formed separately from the annular wall 214a (first wall portion) and the second supporting wall 214c (second wall portion), and a bearing B5 (second bearing) for supporting the first shaft 7 rotating integrally with the first gear 52, and a bearing B6 (third bearing) for supporting the second shaft 8 rotating integrally with the third gear 54 are supported on the third housing 23.

[0067] According to this structure, after the planetary gear mechanism 51 is mounted on the annular wall 214a, the third housing 23, the first gear 52, the second gear 53, the third gear 54, etc. which are separate from the first housing 21 can be mounted, so that a housing structure that is easy to assemble can be formed.

[0068] (5) The unit 1 further includes the inverter 4 , and the inverter housing chamber S1 housing the inverter 4 has a portion overlapping the planetary gear mechanism 51 when viewed in the radial direction.

[0069] According to this configuration, a space is generated radially outside the space where the planetary gear mechanism 51 is arranged, and by forming the inverter housing chamber S1 in the space, the space can be effectively utilized, thereby contributing to miniaturization of the entire unit 1.

[0070] Although the embodiments of the present invention have been described above, the above embodiments merely show a part of application examples of the present invention, and the technical scope of the present invention is not limited to the specific configurations of the above embodiments.

[0071] Explanation of symbols

[0072] 1: Components

[0073] 3: Electric motor (rotating motor)

[0074] 4: Inverter

[0075] 6: Drive shaft

[0076] 7: First axis

[0077] 8: Second axis

[0078] 23: Third housing (third wall portion)

[0079] 51: Planetary gear mechanism

[0080] 52: First Gear

[0081] 53: Second gear

[0082] 54: Third gear

[0083] 55: Fourth gear

[0084] 56: Differential gear

[0085] 214a: annular wall (first wall portion)

[0086] 214c: Second supporting wall (second wall portion)

[0087] B2: Bearing (first bearing)

[0088] B5: Bearing (second bearing)

[0089] B6: Bearing (third bearing)

[0090] C1: Axis (first axis)

[0091] C2: Axis (second axis)

[0092] C3: Axis (third axis)

[0093] S1: Inverter storage room

Claims

1. A component having: Rotating electrical machines; a planetary gear mechanism connected downstream of the rotating electrical machine; a first gear connected to a downstream portion of the planetary gear mechanism; a second gear meshing with the first gear; a third gear connected downstream of the second gear, The rotating electrical machine, the planetary gear mechanism and the first gear are arranged on a first shaft. The second gear and the third gear are arranged on the second shaft, The third gear has a portion sandwiched between the planetary gear mechanism and the second gear.

2. The assembly of claim 1, wherein: Also available: a fourth gear meshing with the third gear; a differential gear connected downstream of the fourth gear; a drive shaft connected downstream of the differential gear, The fourth gear and the differential gear are arranged on the third shaft, The differential gear is arranged on the planetary gear mechanism side relative to the fourth gear.

3. The assembly of claim 2, wherein: Also available: a first wall portion, which fixes the ring gear of the planetary gear mechanism; a second wall portion that supports a first bearing that supports the differential gear, The first wall portion and the second wall portion are integrally formed.

4. The assembly of claim 3, wherein: further comprising a third wall portion opposite to the planetary gear mechanism, The third wall portion is formed separately from the first wall portion and the second wall portion, A second bearing supporting a first shaft that rotates integrally with the first gear and a third bearing supporting a second shaft that rotates integrally with the third gear are supported on the third wall portion.

5. The assembly according to any one of claims 1 to 4, wherein: It also has an inverter. The inverter housing chamber housing the inverter has a portion overlapping the planetary gear mechanism when viewed in the radial direction.

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