Small-speed-ratio single-planet-row coupling motor

Abstract

The utility model relates to a small-speed-ratio single-planet-row coupling motor which comprises a machine shell, a planet row is arranged on the inner side of a coil in the machine shell, and the planet row comprises a planet carrier, a sun wheel shaft and a gear ring. The end of the motor shaft is fixedly connected with or integrally formed with a supporting frame, the axial outer end of the supporting frame is fixedly connected with or integrally formed with the gear ring, a connecting shaft is formed at the axial inner end of the planet carrier, a plurality of planet gears meshed with the gear ring are installed on the planet carrier, the sun gear shaft is fixedly connected with the machine shell, and the sun gear shaft is fixedly connected with the machine shell. The axial inner end of the sun wheel shaft extends into the planet carrier and is meshed with the plurality of planet gears; a connecting cavity connected with the outside is formed in the sun wheel shaft and the connecting shaft, and a plurality of connecting keys are arranged on the inner wall of the connecting shaft. According to the scheme, the single planet row, the gear ring input, the sun wheel shaft fixing and the planet carrier output are arranged in the motor, so that the coupling motor has the effects of reducing speed and increasing torque, a speed reducer is not needed, the motor size is greatly reduced, the motor stack thickness can be halved, and the cost is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a small-ratio single planetary gear coupled motor. Background Technology

[0002] Planetary gear sets have advantages such as high torque transmission capacity, compact structure, light weight, high efficiency and excellent NVH, and are widely used in AT transmissions, DHT hybrid transmissions and coaxial electric drive systems.

[0003] Existing motors are typically used in conjunction with speed reducers. A Chinese invention patent (CN118876699A) discloses an electric drive housing assembly, including an electronic control housing, a motor housing, and a speed reducer housing. Two motor housings are symmetrically arranged on both sides of the speed reducer housing. The electronic control housing is positioned above the speed reducer housing. Each motor housing includes a first end cover, a main housing, and a second end cover. The main housing is cylindrical. The first end cover covers one side of the main housing, and the second end cover is located on the other side of the main housing and integrally formed with it. Two second end covers cover both sides of the speed reducer housing. A speed reducer bearing mounting position is provided on the side of the second end cover facing the speed reducer housing, and a motor bearing mounting position is provided on the side facing the main housing. An output shaft hole is provided in the area of ​​the second end cover extending beyond the main housing. This invention has the advantages of compact structure, ease of maintenance, and excellent heat dissipation performance.

[0004] In the above technical solutions, the electric drive housing assembly is relatively large in size and has a high manufacturing cost. Summary of the Invention

[0005] To address the aforementioned problems, the purpose of this invention is to provide a low-ratio single planetary gear coupled motor. By installing the planetary gear set in the motor, the function of speed reduction and torque increase can be achieved. In this way, under the same output power, the output torque of the motor can be reduced. By increasing the torque through the planetary gear set, the size of the motor can be made smaller and more compact, thereby reducing the manufacturing cost of the motor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A low-ratio single planetary gear coupled motor includes a housing and a rotor and a stator disposed within the housing. The stator includes a stator core and a coil disposed on the stator core. The rotor includes a rotor core and a motor shaft passing through the rotor core. The motor is characterized in that: a planetary gear set is disposed inside the housing on the inner side of the coil; the planetary gear set includes a planet carrier, a sun gear shaft, and a ring gear; a support frame is fixedly connected to or integrally formed at the end of the motor shaft; the ring gear is fixedly connected to or integrally formed at the axial outer end of the support frame; a connecting shaft is formed on the axial inner end of the planet carrier; multiple planetary gears meshing with the ring gear are mounted on the planet carrier; the sun gear shaft is fixedly connected to the housing; the axial inner end of the sun gear shaft extends into the planet carrier and meshes with the multiple planetary gears; a connecting cavity for external connection is formed between the sun gear shaft and the connecting shaft; multiple connecting keys are provided on the inner wall of the connecting shaft.

[0008] Preferably, the end of the motor shaft is provided with an assembly groove, the connecting shaft extends into the assembly groove, and an outer ring stamped roller bearing is fitted on the connecting shaft within the assembly groove.

[0009] Preferably, a cage is fitted onto the sun gear shaft, the cage being press-fitted onto the axial outer end of the planet carrier, and the cage being fixedly connected to the gear ring.

[0010] Preferably, the gear ring has multiple locking blocks protruding from its axial outer end, and the cage has multiple locking grooves on its surface that mate with the locking blocks. First bolts are screwed into the locking blocks and the locking grooves to fix the gear ring and the cage.

[0011] Preferably, the inner bottom surface of the support frame and the retainer is provided with steps, with the steps decreasing in height from the outside to the inside, and the innermost step is provided with an annular roller bearing that abuts against the planetary carrier.

[0012] Preferably, the planetary carrier has multiple connecting windows circumferentially arranged on its side wall, and planetary gears extending out of the side wall of the planetary carrier are installed in the connecting windows. The multiple planetary gears are regularly arranged circumferentially on the planetary carrier.

[0013] Preferably, a rear end cover is fixedly provided on the outer side of the cage, and a connecting sleeve is formed at the axial outer end of the cage, on which a deep groove ball bearing is fitted.

[0014] Preferably, the outer end of the sun gear shaft is formed with an end plate, which abuts against the outer wall of the rear end cover, and the end plate and the rear end cover are fixedly connected by a plurality of second bolts.

[0015] The present invention adopts the above technical solution and has the following beneficial effects:

[0016] 1. By setting a single planetary gear set inside the motor, with the ring gear as the input, the sun gear shaft as the fixed shaft, and the planetary carrier as the output, the coupled motor has the effect of speed reduction and torque increase. There is no need for a speed reducer, which greatly reduces the size of the motor and the thickness of the motor can be halved, effectively reducing costs.

[0017] 2. The planetary array is arranged inside the package, resulting in a more compact internal structure and saving installation space.

[0018] 3. The rotation of the motor shaft drives the gear ring to rotate, which in turn drives multiple planetary gears and planet carriers to rotate, thus achieving a small speed ratio and meeting the requirements of high speed. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of a small-ratio single planetary gear coupled motor.

[0020] Figure 2 This is a schematic cross-sectional view of a small-ratio single planetary gear coupled motor.

[0021] Figure 3 for Figure 2 Enlarged diagram of point A in the diagram.

[0022] Figure 4 This is a schematic diagram of the assembly of the motor shaft and the planetary gear set.

[0023] Figure 5 This is a three-dimensional structural diagram of the motor shaft.

[0024] Figure 6 This is a schematic diagram of the three-dimensional structure of the gear ring.

[0025] Figure 7 This is a three-dimensional structural diagram of the sun gear shaft.

[0026] Figure 8 This is a schematic diagram of the three-dimensional structure of the planetary carrier.

[0027] Figure 9 A schematic diagram of the three-dimensional structure of the cage.

[0028] Figure 10 This is a schematic diagram of the motor's output. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more, unless expressly limited otherwise.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] like Figures 1-10The diagram shows a small-ratio single planetary gear coupled motor, comprising a housing 1 and a rotor and a stator disposed within the housing 1. The stator includes a stator core and a coil disposed on the stator core. The rotor includes a rotor core and a motor shaft 2 passing through the rotor core. A planetary gear set is disposed inside the housing 1 on the inner side of the coil. The planetary gear set includes a planet carrier 3, a sun gear shaft 4, and a ring gear 5. A support frame 16 is fixedly connected to or integrally formed at the end of the motor shaft 2. The ring gear 5 is fixedly connected to or integrally formed at the outer axial end of the support frame 16. A connecting shaft 6 is formed on the inner axial end of the planet carrier 3. Multiple planetary gears 7 that mesh with the ring gear 5 are mounted on the planet carrier 3. The sun gear shaft 4 is fixedly connected to the housing 1. The inner axial end of the sun gear shaft 4 extends into the planet carrier 3 and meshes with the multiple planetary gears 7. A connecting cavity 8 for external connection is formed between the sun gear shaft 4 and the connecting shaft 6. Multiple connecting keys 9 are provided on the inner wall of the connecting shaft 6.

[0035] In the above technical solution, a planetary gear set is installed inside the housing. The planetary gear set includes a ring gear, a sun gear shaft, and a planet carrier. A support frame is fixed or formed on the motor shaft. The support frame is fixedly connected to the ring gear or integrally formed. The planetary gears on the planet carrier mesh with the ring gear. Therefore, the rotation of the motor shaft and the ring gear together drives the planetary gears and the planet carrier to rotate. A connecting key is installed in the connecting shaft on the planet carrier for external transmission. The sun gear shaft is fixed to the housing and supports the multiple planetary gears.

[0036] With a gear ring input, a fixed sun gear shaft, and a planetary carrier output, the coupled motor achieves a speed reduction and torque increase effect, eliminating the need for a speed reducer and significantly reducing motor size. The motor thickness can be halved, effectively lowering costs. Simultaneously, the planetary gear set is located within the winding coil, resulting in a more compact internal structure and saving installation space.

[0037] The rotation of the motor shaft drives the gear ring to rotate, which in turn drives the planetary gears and planet carrier to rotate, achieving a small speed ratio and meeting the requirements of high speed.

[0038] Furthermore, an assembly groove 10 is provided at the end of the motor shaft 2, and the connecting shaft 6 extends into the assembly groove 10. An outer ring stamped roller bearing 11 is fitted onto the connecting shaft 6 within the assembly groove 10. In this technical solution, the assembly groove on the motor shaft allows the connecting shaft to extend into the assembly groove, further reducing the axial dimension of the motor, and the outer ring stamped roller bearing reduces friction between the motor shafts.

[0039] Furthermore, a retainer 12 is fitted onto the sun gear shaft 4, and the retainer 12 is press-fitted onto the axial outer end of the planet carrier 3. The retainer 12 is fixedly connected to the gear ring 5. In this technical solution, a retainer is provided on their axial outer side to maintain the stability of the gear ring and the planet carrier, thereby improving the overall stability of the planetary gear set.

[0040] Furthermore, the axial outer end of the gear ring 5 protrudes with multiple locking blocks 13, and the surface of the retainer 12 is provided with multiple locking grooves 14 that mate with the locking blocks 13. First bolts 15 are screwed into the locking blocks 13 and the locking grooves 14 to fix the gear ring 5 and the retainer 12. In this technical solution, the locking blocks on the gear ring mate with the locking grooves on the retainer, and are then tightened with the first bolts, which greatly improves the connection strength between the gear ring and the retainer.

[0041] Furthermore, the inner bottom surfaces of the support frame 16 and the cage 12 are provided with steps, which decrease in height from the outside to the inside. The innermost step is provided with an annular roller bearing 17 that abuts against the planetary carrier 3. In this technical solution, the inner bottom surfaces of the support frame and the cage are provided with steps, which decrease in height from the outside to the inside. The annular roller bearing is placed on the innermost, lowest step, which reduces the mating thickness of the annular roller bearing and further reduces the axial dimension of the motor.

[0042] Furthermore, the planetary carrier 3 has multiple connecting windows 18 circumferentially arranged on its sidewall. Planetary gears 7, extending out of the sidewall of the planetary carrier 3, are installed within each connecting window 18. These planetary gears 7 are regularly arranged circumferentially on the planetary carrier 3. In this technical solution, the connecting windows facilitate the extension of the planetary gears, while the columns separating adjacent connecting windows ensure the planetary carrier maintains high stability. Specifically, in this case, four planetary gears are regularly arranged.

[0043] Furthermore, a rear end cover 19 is fixedly provided on the outer side of the cage 12, and a connecting sleeve 20 is formed at the axial outer end of the cage 12, on which a deep groove ball bearing 21 is fitted. In this technical solution, the deep groove ball bearing on the connecting sleeve of the cage serves to provide support and reduce friction.

[0044] Furthermore, an end plate 22 is formed at the axial outer end of the sun gear shaft 4. The end plate 22 abuts against the outer wall of the rear end cover 19, and the end plate 22 and the rear end cover 19 are fixedly connected by multiple second bolts 23. In this technical solution, the end plate on the sun gear shaft facilitates the fixing of the sun gear shaft to the rear end cover. The end plate has a certain area and abuts against the outer wall of the rear end cover before being fastened by multiple second bolts, resulting in high stability.

[0045] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A low-ratio single planetary gear coupled motor, comprising a housing (1) and a rotor and a stator disposed within the housing (1), the stator comprising a stator core and a coil disposed on the stator core, the rotor comprising a rotor core and a motor shaft (2) passing through the rotor core, characterized in that: The housing (1) is provided with a planetary gear set inside the coil. The planetary gear set includes a planet carrier (3), a sun gear shaft (4), and a gear ring (5). The end of the motor shaft (2) is fixedly connected to or integrally formed with a support frame (16). The outer axial end of the support frame (16) is fixedly connected to or integrally formed with the gear ring (5). The inner axial end of the planet carrier (3) is formed with a connecting shaft (6). Multiple planetary gears (7) that mesh with the gear ring (5) are installed on the planet carrier (3). The sun gear shaft (4) is fixedly connected to the housing (1). The inner axial end of the sun gear shaft (4) extends into the planet carrier (3) and meshes with multiple planetary gears (7). The sun gear shaft (4) and the connecting shaft (6) form a connecting cavity (8) for external connection. Multiple connecting keys (9) are provided on the inner wall of the connecting shaft (6).

2. The low-ratio single planetary gear coupled motor according to claim 1, characterized in that: The motor shaft (2) has an assembly groove (10) at its end. The connecting shaft (6) extends into the assembly groove (10), and an outer ring stamped roller bearing (11) is fitted on the connecting shaft (6) inside the assembly groove (10).

3. A small-ratio single planetary gear coupled motor according to claim 1, characterized in that: A retainer (12) is fitted on the sun gear shaft (4). The retainer (12) is press-fitted onto the outer axial end of the planet carrier (3). The retainer (12) is fixedly connected to the gear ring (5).

4. A small-ratio single planetary gear coupled motor according to claim 3, characterized in that: The gear ring (5) has multiple locking blocks (13) protruding from its axial outer end. The surface of the retainer (12) has multiple slots (14) that cooperate with the locking blocks (13). The first bolt (15) is screwed into the locking blocks (13) and the slots (14) to fix the gear ring (5) and the retainer (12).

5. A small-ratio single planetary gear coupled motor according to claim 4, characterized in that: The inner bottom surfaces of the support frame (16) and the retainer (12) are provided with steps, which are high to low from the outside to the inside. The innermost step is provided with an annular roller bearing (17) that abuts against the planetary carrier (3).

6. A small-ratio single planetary gear coupled motor according to claim 1, characterized in that: The planet carrier (3) has multiple connecting windows (18) circumferentially arranged on its side wall. Planetary gears (7) extending out of the side wall of the planet carrier (3) are installed in the connecting windows (18). The multiple planetary gears (7) are regularly arranged circumferentially on the planet carrier (3).

7. A small-ratio single planetary gear coupled motor according to claim 5, characterized in that: The outer side of the retainer (12) is fixedly provided with a rear end cover (19), and a connecting sleeve (20) is formed on the axial outer end of the retainer (12), and a deep groove ball bearing (21) is fitted on the connecting sleeve (20).

8. A small-ratio single planetary gear coupled motor according to claim 1, characterized in that: The outer end of the sun gear shaft (4) is formed with an end plate (22), which abuts against the outer wall of the rear end cover (19). The end plate (22) and the rear end cover (19) are fixedly connected by multiple second bolts (23).

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