Semi-direct drive motor system

Abstract

The utility model relates to a semi-direct-drive motor system, which comprises a motor part and a gear box part, the motor part (100) comprises a motor shaft (16) and a motor box body, the motor box body comprises a cylindrical body (10) and a motor flange (12), and a first end of the motor shaft is supported by the motor flange; the gearbox part comprises a sun gear (52), an inner ring gear (54), a planet carrier (56) and at least one planet gear (58), the inner ring gear (54) is connected to the motor box by means of a plurality of first fasteners (27) and is connected to other fixed components of the gearbox part by means of a plurality of second fasteners (29) different from the plurality of first fasteners (27), and the sun gear (52) comprises a toothed section (62) and an engagement section (64); the motor shaft (16) comprises a shaft hole (15) which is used for being connected with the connecting section (64) of the sun gear so that the sun gear (52) and the motor shaft (16) can rotate synchronously.

Description

Technical Field

[0001] This application relates to a semi-direct drive motor system. Background Art

[0002] In the existing semi-direct drive motor system, the disassembly and assembly of the motor part and the gearbox part are interrelated and cannot form separate parts. During assembly, the assembled motor part needs to be transported to the gearbox processing factory, and the gearbox parts are assembled in sequence, and the assembly of the two parts is mutually restricted. If one part (or any component) needs to be replaced, the entire motor system needs to be disassembled. Moreover, the motor part and the gearbox part cannot be transported separately. Summary of the Utility Model

[0003] The purpose of this application is to improve the structure of the semi-direct drive motor system and construct its motor part and gearbox part into independent parts from each other.

[0004] This purpose is achieved by the semi-direct drive motor system of this application.

[0005] The semi-direct drive motor system of this application includes a motor part and a gearbox part. The gearbox part includes a planetary transmission assembly. The planetary transmission assembly includes a sun gear, an internal gear ring, a planet carrier, and at least one planet gear meshing between the internal gear ring and the sun gear. Each planet gear is rotatably supported on the planet carrier via a pin shaft. The motor part includes a motor shaft and a motor housing. The motor housing includes a cylindrical body and a motor flange extending radially inward from the cylindrical body. The motor shaft includes a first end for connecting to the sun gear of the gearbox part and a second end opposite in the axial direction. The first end is rotatably supported by the motor flange. Wherein, the internal gear ring of the planetary transmission assembly is connected to the motor housing of the motor part by means of a plurality of first fasteners and is connected to other fixed parts of the gearbox part by means of a plurality of second fasteners different from the plurality of first fasteners. The sun gear includes a toothed section and a joint section extending from the toothed section. Wherein, the motor shaft of the motor part includes a shaft hole configured to receive and engage the joint section of the sun gear so that the sun gear rotates synchronously with the motor shaft.

[0006] In one embodiment, the engagement between the motor shaft and the sun gear includes a spline engagement, wherein a plurality of convex keys are formed on the outer surface of the joint section of the sun gear, and a plurality of key grooves for receiving the plurality of convex keys are formed on the inner circumferential surface of the motor shaft defining the shaft hole.

[0007] In one embodiment, the engagement between the motor shaft and the sun gear includes a bolt engagement, wherein the motor shaft includes a threaded hole that extends axially from the shaft hole further into the motor shaft, the sun gear defines a through hole in the axial direction, and the bolt engagement is achieved by a bolt that passes through the through hole and is threadedly connected into the threaded hole.

[0008] In one embodiment, the motor housing further includes a bearing seat that defines a bearing hole for receiving a bearing that supports the first end of the motor shaft.

[0009] In one embodiment, the bearing seat is integrally formed with the motor flange or is detachably connected to the motor flange.

[0010] In one embodiment, the motor part further includes a bearing cover that is sleeved on the motor shaft on the inner side in the axial direction of the bearing, and the bearing cover and the bearing seat are detachably connected.

[0011] In one embodiment, the internal gear ring of the gearbox includes an annular body formed with teeth on the inner circumferential surface and a flange that extends radially outward from the annular body, the flange includes a plurality of through holes arranged around the axial direction, and each of the first fasteners passes through a corresponding through hole and is threadedly connected into a corresponding threaded hole formed on the motor flange.

[0012] In one embodiment, the other fixed components of the gearbox are the housing components of the gearbox or the internal gear rings of other planetary gear transmission components different from the planetary gear transmission assembly.

[0013] In one embodiment, in the axial direction, the planet carrier extends into a recessed area of the motor flange of the motor part.

[0014] In the semi-direct drive motor system of the present application, the motor shaft of the motor part is connected to the sun gear of the planetary gear transmission assembly of the gearbox part, and the motor housing of the motor part is connected to the sun gear of the planetary gear transmission assembly of the gearbox part. In particular, the sun gear of the gearbox part is also separately connected to other fixed components of the gearbox part (such as a certain gearbox housing component or the internal gear ring of other planetary gear transmission components). This enables the motor part and the gearbox part to be assembled into a separate part or assembly respectively, and then the two are detachably connected together. As needed, the motor part and the gearbox part can be manufactured or assembled at the same or different locations, and then either of the two can be transported to the location of the other for assembly as needed. When it is necessary to disassemble one of the motor part and the gearbox part for repairing or replacing any components, the other part can remain unaffected and does not need to be disassembled. This simplifies the maintenance process and improves the flexibility of manufacturing and assembly. Description of the Drawings

[0015] Figure 1 This is an external view of the semi-direct drive motor system of the present application.

[0016] Figure 2 is Figure 1 a partial cross-sectional view of the semi-direct drive motor system of Detailed Description of the Invention

[0017] The following will describe in detail the semi-direct drive motor system of the present application with reference to Figure 1 An external view of the semi-direct drive motor system of the present application is shown, Figure 2 which is a partial cross-sectional view.

[0018] The semi-direct drive motor system of the present application includes a motor part 100 and a gearbox part 200. Each part is provided as a separate component / assembly and is detachably connected together. In the illustrated non-limiting example, the motor part 100 provided as an independent component and the gearbox part 200 provided as an independent component are connected together by fasteners.

[0019] The motor part 100 can be any known permanent magnet motor in the art, mainly including a motor housing, a stator and a rotor accommodated in the motor housing, and a motor shaft extending out of the motor housing to output rotational motion. Figure 1 and 2 The cylindrical body 10 of the motor housing and the motor flange 12 connected to one end of the cylindrical body 10 are shown in Figure 1 It is also shown that the motor housing of the motor part 100 includes another motor flange 14 connected or integrally formed at the opposite end of the cylindrical body 10. The stator and rotor and associated components in the motor housing can have any possible configuration of any type of permanent magnet motor in the art, which are not the focus of the present application and will not be described in detail here.

[0020] In this document, the direction in which the motor shaft 16 extends is referred to as the axial direction, the direction around the axial direction is referred to as the circumferential direction, and the radial direction extends perpendicular to the axial direction. The description of the present application will use these directional terms, and the understanding of these directional terms refers to the accompanying drawings.

[0021] The motor shaft 16 has a first end and a second end opposite to each other in the axial direction ( Figure 2 not visible in

[0022] The motor housing further includes a bearing housing 24 which is arranged around the motor shaft 16 near the first end of the motor shaft 16 and defines a bearing hole 25. The motor flange 12 extends radially outward from the bearing housing 24 and is connected to the cylindrical body 10. The motor shaft 16 is rotatably supported at its first end by a bearing 26 installed in the bearing hole 25, and is rotatably supported at its second end by another bearing (not shown). A bearing cover 28 is provided axially inside the bearing 26 on the motor shaft 16.

[0023] The bearing housing 24 is connected to the bearing cover 28, and the bearing housing 24 is connected to the motor flange 12. In the illustrated non-limiting embodiment, the bearing housing 24 and the bearing cover 28 are fastened together by a plurality of fasteners 21 arranged in the circumferential direction, and the bearing housing 24 and the motor flange 12 are fastened together by a plurality of fasteners 23 arranged in the circumferential direction. Note that an example of the term "fastener" in the present application is a bolt, but it is not limited to bolts.

[0024] More specifically, the motor flange 12 may include an outer peripheral portion 32 connected to the cylindrical body 10, an inner peripheral portion 34 connected to the bearing housing 24 via the fasteners 23, and a main body portion 36 extending radially between the outer peripheral portion 32 and the inner peripheral portion 34. The bearing housing 24 includes a first flange 38 connected to the inner peripheral portion 34 of the motor flange 12 via the fasteners 23, a second flange 42 connected to the bearing cover 28 via the fasteners 21, and a seat body 44 extending substantially axially between the first flange 38 and the second flange 42. The bearing cover 28 may include a sleeve portion 46 and a collar portion 48 extending radially outward from the sleeve portion 46.

[0025] Each fastener 21 extends through a through hole formed in the collar portion 48 into a threaded hole formed in the second flange 42 of the bearing housing 24. Each fastener 23 extends through a through hole formed in the first flange 38 of the bearing housing 24 into a threaded hole formed in the inner peripheral portion 34 of the motor flange 12.

[0026] Although the exemplary fasteners, such as bolt connection methods, of the bearing housing 24, the bearing cover 28, and the motor flange 12 are shown in the figures, those skilled in the art should understand that the connections between the bearing housing 24 and the bearing cover 28 and between the bearing housing 24 and the motor flange 12 are not limited to the illustrated bolt connection. For example, the bearing housing 24 and the motor flange 12 may be provided as an integral part.

[0027] The motor shaft 16 passes through the bearing cover 28 and passes through the bearing housing 24 and extends out of the motor housing. For example, but not necessarily, in the axial direction, the length by which the motor shaft 16 extends beyond the bearing housing 24 is designed not to exceed the axial end face of the motor part 100 (or the motor housing) (for example, the outermost axial surface 31 of the outer peripheral portion 32 of the motor flange 12).

[0028] The motor shaft 16 includes a shaft hole 15 that axially extends from its first end into the interior of the motor shaft 16. The shaft hole 15 is designed to receive a portion of the sun gear 52 of the planetary gear assembly of the gearbox section 200. The gearbox section 200 of the present application may include one or more planetary gear assemblies. Unless otherwise specified, the "planetary gear assembly" in the present application specifically refers to the planetary gear assembly that is closest to the motor section 100 and is engaged with or directly driven by the motor shaft 16 of the motor section 100.

[0029] The planetary gear assembly of the gearbox section 200 includes a sun gear 52, an internal gear ring 54, a planet carrier 56, and at least one planet gear 58 rotatably supported by the planet carrier 56 via a pin shaft 57. As can be seen from the figure, in the planetary gear assembly of the gearbox section 200, the planet gear 58 is in gear engagement with both the sun gear 52 and the internal gear ring 54. The sun gear 52 is directly engaged with the motor shaft 16 and is directly driven by the motor shaft 16 to rotate. The planet carrier 56 is configured to rotate or output rotational motion when the motor shaft 16 drives the sun gear 52 to rotate.

[0030] Specifically, in the illustrated non-limiting embodiment, the sun gear 52 and the motor shaft 16 can be synchronously rotationally engaged in two ways: spline connection and bolt connection. The sun gear 52 includes a toothed segment 62 that meshes with the planet gear 58 and a shaft rod segment 64 that extends from the toothed segment 62 and is adapted to be received within the shaft hole 15 of the motor shaft 16. The shaft rod segment 64 of the sun gear 52 and the shaft hole 15 of the motor shaft 16 are connected by splines. For example, the outer peripheral surface of the shaft rod segment 64 of the sun gear 52 is formed with a plurality of convex keys arranged in the circumferential direction, and the inner peripheral surface of the shaft hole 15 of the motor shaft 16 is formed with a plurality of corresponding key grooves. Optionally, the outer peripheral surface of the shaft rod segment 64 of the sun gear 52 and the inner peripheral surface of the shaft hole 15 of the motor shaft 16 are respectively formed with corresponding key grooves, and a separately provided key is inserted into the key grooves that are opposite to each other in the radial direction.

[0031] The sun gear 52 further includes an axially extending through hole 55. A fastener 67 extends through the through hole 55 into a threaded hole 59 that axially extends further from the shaft hole 15 of the motor shaft 16 into the motor shaft 16, further connecting the sun gear 52 to the motor shaft 16. Those skilled in the art should understand that the driving engagement between the sun gear 52 and the motor shaft 16 is not limited to both spline connection and bolt connection, but can adopt only one of the connection methods or a combination with any other known connection method (such as a single key).

[0032] As described above, in the illustrated embodiment, the component on the gearbox portion 200 for connection to the motor portion 100 is the internal gear ring 54. Specifically, the internal gear ring 54 includes an annular body 72 having teeth formed on its inner circumferential surface and a flange 74 extending radially outward from the annular body 72. Fasteners 27, which are evenly spaced in the circumferential direction, extend through through-holes formed in the flange 74 into corresponding threaded holes formed in the motor flange 12 of the motor housing.

[0033] It can also be seen from the figure that (for example, a plurality of) fasteners 29, which are evenly spaced in the circumferential direction, extend through axial through-holes formed in the annular body 72 of the internal gear ring 54 into the housing component 80 of the gearbox portion 200. Thus, when the connection between the motor portion 100 and the gearbox portion 200 is disconnected (i.e., when the fasteners 27 are removed) or before the motor portion 100 and the gearbox portion 200 are connected together, the motor portion 100 and the gearbox portion 200 are each a separate component. This allows the motor portion and the gearbox portion of this semi-direct drive motor system to be manufactured and assembled at different locations (or different factories), and then one of them can be transported to the manufacturing or assembly location of the other for assembly. When one or some components in the motor portion 100 need to be repaired or replaced, it is not necessary to affect the components of the gearbox portion 200 or to disassemble the gearbox portion 200, and vice versa.

[0034] The connection between the motor portion 100 and the gearbox portion 200 may include only a first detachable connection between the motor shaft 16 and the sun gear 52 and a second detachable connection between the motor flange 12 of the motor housing and the internal gear ring 54 of the gearbox portion 200.

[0035] It can also be seen from the figure that in the axial direction, the planet carrier 56 of the gearbox portion 200 extends into the recessed area 85 of the main body portion 36 of the motor flange 12 of the motor portion 100, which minimizes the axial dimension of the semi-direct drive motor system of the present application and is beneficial to improving the connection stiffness between the gearbox portion 200 and the motor portion 100.

[0036] Although in the illustrated embodiment, the internal gear ring 54 of the gearbox portion 200 is connected to the gearbox housing component by fasteners 29, it is conceivable that the internal gear ring 54 of the gearbox portion 200 can also be connected to other fixed components of the gearbox portion 200, such as the internal gear ring of other planetary transmission components (if any) of the gearbox portion 200.

[0037] The exemplary embodiments of the present application have been described above with reference to the accompanying drawings. However, it should be understood that without departing from the essence and scope of the present application, those skilled in the art can make any possible modifications to any details shown and given above, and all such modifications will be considered to fall within the protection scope of the present application.

Claims

1. A semi-direct drive motor system, comprising a motor part (100) and a gearbox part (200), wherein the gearbox part (200) comprises a planetary transmission assembly, and the planetary transmission assembly comprises a sun gear (52), an internal gear ring (54), a planet carrier (56), and at least one planet gear (58) meshing between the internal gear ring (54) and the sun gear (52), and each planet gear (58) is rotatably supported on the planet carrier (56) via a pin shaft (57). It is characterized in that: The motor part (100) comprises a motor shaft (16) and a motor housing, the motor housing comprises a cylindrical body (10) and a motor flange (12) extending radially inwards from the cylindrical body (10), the motor shaft comprises a first end for connecting to the sun gear (52) of the gearbox part (200) and a second end opposite in the axial direction, and the first end is rotatably supported by the motor flange (12). Wherein, the internal gear ring (54) of the planetary transmission assembly is connected to the motor housing of the motor part (100) by means of a plurality of first fasteners (27), and is connected to other fixed parts of the gearbox part by means of a plurality of second fasteners (29) different from the plurality of first fasteners (27), and the sun gear (52) comprises a toothed section (62) and a joint section (64) extending from the toothed section. Wherein, the motor shaft (16) of the motor part comprises a shaft hole (15), and the shaft hole is configured to receive and engage the joint section (64) of the sun gear so that the sun gear (52) rotates synchronously with the motor shaft (16).

2. The semi-direct drive motor system according to claim 1, characterized in that The engagement between the motor shaft (16) and the sun gear (52) comprises a spline engagement, wherein a plurality of convex keys are formed on the outer surface of the joint section (64) of the sun gear (52), and a plurality of key grooves for receiving the plurality of convex keys are formed on the inner peripheral surface of the motor shaft (16) defining the shaft hole (15).

3. The semi-direct drive motor system according to claim 2, characterized in that, The engagement between the motor shaft (16) and the sun gear (52) comprises a bolt engagement, wherein the motor shaft (16) comprises a threaded hole extending further axially from the shaft hole (15) into the motor shaft (16), the sun gear (52) defines a through hole (55) in the axial direction, and the bolt engagement is realized by a bolt threaded through the through hole (55) and into the threaded hole.

4. The semi-direct drive motor system according to claim 1, characterized in that, The motor housing further comprises a bearing seat (24), and the bearing seat (24) defines a bearing hole (25) for receiving and supporting a bearing (26) at the first end of the motor shaft (16).

5. The semi-direct drive motor system according to claim 4, characterized in that, The bearing seat (24) is integrally formed with the motor flange (12) or is detachably connected to the motor flange (12).

6. The semi-direct drive motor system according to claim 5, wherein The motor part further comprises a bearing cover (28) sleeved on the motor shaft (16) axially inside the bearing (26), and the bearing cover (28) and the bearing seat (24) are detachably connected.

7. The semi-direct drive motor system according to any one of claims 1-6, characterized in that The internal gear ring (54) of the gearbox includes an annular body (72) having teeth formed on an inner circumferential surface and a flange (74) extending radially outward from the annular body, the flange including a plurality of through holes arranged around an axial direction, and each of the first fasteners passes through a corresponding one of the through holes and is threadedly connected into a corresponding threaded hole formed in the motor flange (12).

8. The semi-direct drive motor system according to any one of claims 1-6, characterized in that, Other fixed components of the gearbox are the housing components of the gearbox or the internal gear rings of other planetary gear train components different from the planetary gear train component.

9. The semi-direct drive motor system according to any one of claims 1-6, characterized in that, In the axial direction, the planet carrier (56) extends into a recessed area (85) of the motor flange (12) of the motor portion (100).

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