Small-speed-ratio planet row and dead axle gear coupling motor

Abstract

The utility model relates to a low-speed-ratio planet row and dead axle gear coupling motor, a planet row is arranged in the motor, and the planet row comprises a planet carrier, a gear ring, a dead axle gear and an output shaft; at least one planetary gear set is arranged on the planet carrier in the axial direction, each planetary gear set comprises a plurality of planetary gears arranged on the planet carrier in the circumferential direction, the gear ring is fixedly arranged on the rear end cover, at least part of the planet carrier extends into the gear ring, and at least one planetary gear set is meshed with the gear ring; the fixed shaft gear is fixedly connected or integrally formed at the axial outer end of the motor shaft, and the fixed shaft gear extends into the planet carrier to be meshed with the planet gear set close to the motor shaft; the output shaft is connected to the planet carrier or integrally formed on the planet carrier, and a connecting spline is arranged on the inner wall of the output shaft. According to the scheme, the fixed shaft gear and the motor shaft are integrated, the gear ring is fixed, and the planet carrier is matched for output, 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] The utility model relates to motor technical field especially relates to a small speed ratio planetary row and fixed axle gear coupling motor. BACKGROUND

[0002] The planetary row has the advantages of large torque transmission capacity, compact structure, light weight, high efficiency and excellent NVH, and is widely used in AT transmission, DHT hybrid transmission and coaxial electric drive system.

[0003] CN118832984A Wheel loader electric drive axle, including axle housing and being located at the both ends of axle housing electric wheel, axle housing includes shell and is located at the both ends of shell first flange;Electric wheel includes the reducer that is located in the rim, the walking motor that is located in the axle housing and the brake that is located in the axle housing;The brake is located on the brake mounting seat of walking motor inner end;The brake includes cylinder body, the piston that is located in the cylinder body, fixed friction plate, movable friction plate and brake disc, brake disc is located between fixed friction plate and movable friction plate, the piston can drive movable friction plate to be close to fixed friction plate, fixed friction plate is fixed on the cylinder body;Walking motor output shaft one end prolongs and extends into the brake, walking motor extension shaft is equipped with transition spline, brake disc is sleeved on transition spline.Solve the low transmission efficiency problem of traditional mechanical bridge;Solve the problem of large space demand of existing caliper brake electric wheel structure form;Solve the high manufacturing cost problem of existing wet brake electric wheel structure.

[0004] The electric drive structure in the above-mentioned scheme has large size of the combination of the motor and the reducer, high manufacturing cost and high space occupancy. SUMMARY

[0005] In order to solve the above problems, the utility model discloses a small speed ratio planetary row and fixed axle gear coupling motor, the planetary row is installed in the motor, the effect of speed reduction and torque increase can be realized, so that the motor output torque can be reduced under the same output power, the planetary row is used for torque increase, and the reducer is not needed, the motor is small in size and compact, and the manufacturing cost of the motor is reduced.

[0006] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A small speed ratio planetary row and fixed axle gear coupling motor, including the shell and the rotor and the stator arranged in the shell, the stator includes the stator core, the rotor includes the rotor core and the motor shaft penetrating the rotor core, characterized in that:

[0008] The motor is provided with a planetary gear train, which comprises a planet carrier, a ring gear, a fixed shaft gear and an output shaft; the planet carrier is provided with at least one set of planetary gear sets in the axial direction, each set of planetary gear sets comprises a plurality of planetary gears arranged circumferentially on the planet carrier, the ring gear is fixedly arranged on the rear end cover, the planet carrier at least partially extends into the ring gear, and at least one set of planetary gear sets is engaged with the ring gear; the fixed shaft gear is fixedly connected or integrally formed on the axial outer end of the motor shaft, the fixed shaft gear extends into the planet carrier and is engaged with the planetary gear set close to the motor shaft; and the output shaft is connected to or integrally formed on the planet carrier, and the inner wall of the output shaft is provided with connecting splines.

[0009] As a preferred, the rear end cover is in interference fit with the ring gear.

[0010] As a preferred, the planet carrier is provided with one set of planetary gear sets, the inner wall of the ring gear is provided with internal teeth in the axial outer portion, a plurality of first planetary gears are regularly arranged circumferentially on the planet carrier and extend out of the side wall of the planet carrier to be engaged with the internal teeth, and the output shaft is formed on the axial outer end surface of the planet carrier.

[0011] As a preferred, the inner wall of the ring gear is provided with an annular barrier in the middle portion, a support groove is formed between the annular barrier and the inner wall of the ring gear, and the motor shaft is connected to the support groove through a deep groove ball bearing.

[0012] As a preferred, the output shaft is connected to the rear end cover through a deep groove ball bearing.

[0013] As a preferred, the planet carrier is provided with two sets of planetary gear sets, including a second planetary gear set close to the motor shaft and a third planetary gear set away from the motor shaft, the outer diameter of the second planetary gear is greater than the outer diameter of the third planetary gear; the ring gear comprises a primary ring gear matched with the second planetary gear set and a secondary ring gear matched with the third planetary gear set, and the inner diameter of the primary ring gear is smaller than the inner diameter of the secondary ring gear;

[0014] A plurality of second planetary gears are regularly arranged circumferentially on the axial inner side of the planet carrier and extend out of the side wall of the planet carrier to be engaged with the inner wall of the primary ring gear, and a plurality of third planetary gears are regularly arranged circumferentially on the axial outer side of the planet carrier and extend out of the side wall of the planet carrier to be engaged with the inner wall of the secondary ring gear; the side wall of the output shaft is provided with external teeth in the lower portion and extends into the planet carrier to be engaged with the plurality of third planetary gears.

[0015] As a preferred, the axial outer end surface of the planet carrier is outwardly provided with a connecting sleeve, and the output shaft is connected to the connecting sleeve through an outer ring stamping roller bearing.

[0016] As a preferred, the axial inner end of the primary ring gear forms a connecting ring, and the motor shaft is connected to the connecting ring through a deep groove ball bearing.

[0017] As preferred, the connecting sleeve is connected to the rear end cover through a deep groove ball bearing, and a sealing ring is arranged between the connecting sleeve and the output shaft, and a circular ring roller bearing is arranged between the output shaft and the axial outer end of the planet carrier, the axial inner end of the output shaft and the planet carrier, and the axial inner end of the planet carrier and the primary gear ring.

[0018] As preferred, each group of planetary gear sets comprises four planetary gears arranged on the planet carrier in a regular circumferential direction.

[0019] The above technical scheme has the following beneficial effects:

[0020] 1. A single or double planetary row is arranged in the motor, the fixed shaft gear is integrated with the motor shaft, the gear ring is fixed, and the planet carrier cooperates with the output, so that the coupling motor has the effect of speed reduction and torque increase, without the need for a reducer, greatly reducing the size of the motor, reducing the thickness of the motor by half, and effectively reducing the cost.

[0021] 2. The motor shaft rotates together with the fixed shaft gear, and the planetary gear and the planet carrier are actuated to rotate, thereby driving the output shaft on the planet carrier or the output shaft connected to the planet carrier to output, which can realize a small speed ratio and meet the demand for high rotational speed. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic view of the three-dimensional structure of the first coupling motor.

[0023] Figure 2 It is a schematic view of the cross-sectional structure of the first coupling motor.

[0024] Figure 3 It is Figure 2 It is an enlarged schematic view of position A in the middle.

[0025] Figure 4 It is an assembly schematic view of the motor shaft and the double planetary row.

[0026] Figure 5 It is an assembly schematic view of the motor shaft and the planet carrier in the first coupling motor.

[0027] Figure 6 It is a schematic view of the three-dimensional structure of the gear ring in the first coupling motor.

[0028] Figure 7 It is a schematic view of the arrangement of the second planetary gear and the third planetary gear in the first coupling motor.

[0029] Figure 8 It is an assembly schematic view of the motor shaft and the fixed shaft gear in the first coupling motor.

[0030] Figure 9 It is a schematic view of the three-dimensional structure of the planet carrier in the first coupling motor.

[0031] Figure 10 This is a schematic diagram of the three-dimensional structure of the output shaft in the first coupling motor.

[0032] Figure 11 This is the output schematic diagram of the first coupling motor.

[0033] Figure 12 Schematic diagram of the three-dimensional structure of the second coupling motor.

[0034] Figure 13 Schematic diagram of the cross-section structure of the second coupling motor

[0035] Figure 14 for Figure 14 Enlarged schematic diagram of point B in the middle.

[0036] Figure 15 This is a schematic diagram of the assembly of the motor shaft and the single planetary gear.

[0037] Figure 16 This is a schematic diagram of the assembly of the motor shaft and the fixed axis gear in the second coupling motor.

[0038] Figure 17 This is a schematic diagram of the three-dimensional structure of the ring gear in the second coupling motor.

[0039] Figure 18 This is a schematic diagram of the three-dimensional structure of the planetary carrier in the second coupling motor.

[0040] Figure 19 This is the output schematic diagram of the second coupling motor. DETAILED DESCRIPTION

[0041] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0043] 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.

[0044] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0046] like Figures 1-19 The small speed ratio planetary gear and fixed axis gear coupled motor shown in the figure includes a housing 1 and a rotor and a stator disposed in the housing 1. The stator includes a stator core, and the rotor includes a rotor core and a motor shaft 2 passing through the rotor core. The characteristics are:

[0047] The motor is provided with a planetary row, which includes a planetary carrier 3, a ring gear 4, a fixed axis gear 5 and an output shaft 6; at least one set of planetary gear sets is axially provided on the planetary carrier 3, and each set of planetary gear sets includes a plurality of planetary gears circumferentially arranged on the planetary carrier 3, the ring gear 4 is fixedly provided on the rear end cover 8, the planetary carrier 3 at least partially extends into the ring gear 4, and at least one set of planetary gear sets is meshed with the ring gear 4; the fixed axis gear 5 is fixedly connected to or integrally formed on the axial outer end of the motor shaft 2, and the fixed axis gear 5 extends into the planetary carrier 3 and meshes with the planetary gear set close to the motor shaft 2; the output shaft 6 is connected to the planetary carrier 3 or integrally formed on the planetary carrier 3, and a connecting spline is provided on the inner wall of the output shaft 6.

[0048] In the above technical solution, a planetary gear is arranged in the motor, and the planetary gear has at least one set of planetary gear sets, that is, a single planetary gear or a multi-planetary gear. The fixed axis gear is integrated with the motor shaft, the gear ring is fixed, and the motor shaft rotates together with the fixed axis gear, driving the planetary gear and the planetary carrier to rotate, thereby driving the output shaft on the planetary carrier or the output shaft connected to the planetary carrier to output, so that the coupled motor has the effect of deceleration and torque increase, without the need for a reducer, greatly reducing the size of the motor, and the motor stack thickness can be halved, effectively reducing the cost, and can achieve a small speed ratio to meet high speed requirements.

[0049] Furthermore, the rear end cover 8 is interference fit with the gear ring 4. In this technical solution, the rear end cover 8 is interference fit with the gear ring 4, which is easy to install and has a stable structure.

[0050] like Figures 1-11 In the first coupled motor shown, the planetary carrier 3 is provided with two planetary gear sets, including a second planetary gear set close to the motor shaft 2 and a third planetary gear set far from the motor shaft 2. The outer diameter of the second planetary gear 72 is larger than the outer diameter of the third planetary gear 73. The ring gear 4 includes a primary ring gear 11 that cooperates with the second planetary gear set, and a secondary ring gear 12 that cooperates with the third planetary gear set. The inner diameter of the primary ring gear 11 is smaller than the inner diameter of the secondary ring gear 12.

[0051] A plurality of second planetary gears 72 are circumferentially regularly installed on the axial inner side of the planetary carrier 3 and extend out of the side wall of the planetary carrier 3 to engage with the inner wall of the first-stage ring gear 11. A plurality of third planetary gears 73 are circumferentially regularly installed on the axial outer side of the planetary carrier 3 and extend out of the side wall of the planetary carrier 3 to engage with the inner wall of the second-stage ring gear 12. The lower part of the side wall of the output shaft 6 is provided with external teeth 13 and extends into the planetary carrier 3 to engage with the plurality of third planetary gears 73.

[0052] In the above scheme, a double planetary gear set is set in the motor, and the motor shaft rotates together with the fixed axis gear, which drives the first planetary gear set to rotate, drives the planetary carrier to rotate, thereby causing the second planetary gear set to rotate, and drives the output shaft to rotate the output, so that the coupled motor has the effect of reducing speed and increasing torque. No reducer is required, the motor size is greatly reduced, the motor stack thickness can be halved, effectively reducing costs, and a small speed ratio can be achieved to meet high speed requirements.

[0053] Furthermore, a connecting sleeve 14 is protruding outward from the axial outer end surface of the planet carrier 3, and the output shaft 6 is connected to the connecting sleeve 14 via an outer ring stamped roller bearing 15. In this technical solution, the outer ring stamped roller bearing reduces friction between the output shaft and the connecting sleeve and plays a supporting role.

[0054] Furthermore, the axial inner end of the primary gear ring 11 forms a connecting ring 16, and the motor shaft 2 is connected to the connecting ring 16 via a deep groove ball bearing 10. In this technical solution, the deep groove ball bearing supports the motor shaft and reduces friction.

[0055] Furthermore, the connecting sleeve 14 is connected to the rear end cover 8 via a deep groove ball bearing 10. A sealing ring 17 is provided between the connecting sleeve 14 and the output shaft 6. Toroidal roller bearings 18 are provided between the sealing ring 17 and the output shaft 6, the axial outer end of the planet carrier 3 and the rear end cover 8, the axial inner end of the output shaft 6 and the planet carrier 3, and the axial inner end of the planet carrier 3 and the primary ring gear 11. In this technical solution, the provision of the toroidal roller bearings reduces friction between the sealing ring 17 and the output shaft 6, the axial outer end of the planet carrier 3 and the rear end cover 8, the axial inner end of the output shaft 6 and the planet carrier 3, and the axial inner end of the planet carrier 3 and the primary ring gear 11, while also providing isolation and support.

[0056] like Figures 12-19 As shown, the planetary carrier 3 is equipped with a planetary gear set. The inner wall of the ring gear 4 is provided with internal teeth on the axially outer side. Multiple first planetary gears 71 are regularly mounted on the planetary carrier 3 in a circumferential direction and extend out of the side wall of the planetary carrier 3 to mesh with the internal teeth. The output shaft 6 is formed on the axial outer end surface of the planetary carrier 3. In this technical solution, the motor shaft rotates together with the fixed axis gear, turning the multiple first planetary gears, driving the planetary carrier and the output shaft mounted on the planetary carrier to rotate. This can be directly connected to the differential via parallel gears or coaxially connected to the differential, significantly reducing the size and weight of the entire electric drive, achieving a small speed ratio, and meeting high speed requirements.

[0057] Furthermore, an annular retaining wall 9 is provided in the middle of the inner wall of the ring gear 4, forming a support groove between the annular retaining wall 9 and the inner wall of the ring gear 4. The motor shaft 2 is connected to the support groove via a deep groove ball bearing 10. In this technical solution, the deep groove ball bearing supports the motor shaft and reduces friction.

[0058] Furthermore, the output shaft 6 is connected to the rear end cover 8 via a deep groove ball bearing 10. In this technical solution, the deep groove ball bearing supports the output shaft and reduces friction.

[0059] Furthermore, each planetary gear set includes four planetary gears regularly arranged circumferentially on the planet carrier 3 .

[0060] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model. The ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model.

Claims

1. A small-speed-ratio planetary gear set and fixed-axle gear coupling motor, comprising a casing (1) and a rotor and a stator arranged in the casing (1), the stator comprising a stator core and the rotor comprising a rotor core and a motor shaft (2) penetrating the rotor core, characterized in that: the motor is provided with a planetary gear set, the planetary gear set comprising a planet carrier (3), a ring gear (4), a fixed-axle gear (5) and an output shaft (6); the planet carrier (3) is provided with at least one set of planetary gears in the axial direction, each set of planetary gears comprising a plurality of planetary gears arranged circumferentially on the planet carrier (3), the ring gear (4) is fixedly arranged on a rear end cover (8), the planet carrier (3) at least partially extends into the ring gear (4), and at least one set of planetary gears is engaged with the ring gear (4); the fixed-axle gear (5) is fixedly connected or integrally formed on the axial outer end of the motor shaft (2), the fixed-axle gear (5) extends into the planet carrier (3) and is engaged with the set of planetary gears close to the motor shaft (2); and the output shaft (6) is connected to or integrally formed on the planet carrier (3), and the inner wall of the output shaft (6) is provided with connecting splines. The rear end cover (8) is in interference fit with the ring gear (4).

2. A small-ratio planetary array and fixed-axle gear coupling electric machine according to claim 1, characterized in that: The planet carrier (3) is provided with one set of planetary gears, the inner wall of the ring gear (4) is provided with internal teeth in the axial direction, a plurality of first planetary gears (71) are regularly arranged circumferentially on the planet carrier (3) and extend out of the side wall of the planet carrier (3) to engage with the internal teeth, and the output shaft (6) is formed on the axial outer end surface of the planet carrier (3).

3. A small-ratio planetary array and fixed-axle gear coupling electric machine according to claim 2, characterized in that: The inner wall of the ring gear (4) is provided with an annular barrier wall (9) in the middle, a support groove is formed between the annular barrier wall (9) and the inner wall of the ring gear (4), and the motor shaft (2) is connected to the support groove through a deep groove ball bearing (10).

4. A small-ratio planetary array and fixed-axle gear coupling electric machine according to claim 3, characterized in that: The output shaft (6) is connected to the rear end cover (8) through a deep groove ball bearing (10).

5. A small-ratio planetary row and fixed-axle gear coupling electric machine according to claim 3, characterized in that: The planet carrier (3) is provided with two sets of planetary gears, including a second set of planetary gears close to the motor shaft (2) and a third set of planetary gears away from the motor shaft (2), the outer diameter of the second planetary gear (72) is larger than the outer diameter of the third planetary gear (73); the ring gear (4) comprises a primary ring gear (11) matched with the second set of planetary gears and a secondary ring gear (12) matched with the third set of planetary gears, the inner diameter of the primary ring gear (11) is smaller than the inner diameter of the secondary ring gear (12); 6. A small-ratio planetary array and fixed-axle gear coupling electric machine according to claim 2, characterized in that: a plurality of second planetary gears (72) are regularly arranged circumferentially on the axial inner side of the planet carrier (3) and extend out of the side wall of the planet carrier (3) to engage with the inner wall of the primary ring gear (11), and a plurality of third planetary gears (73) are regularly arranged circumferentially on the axial outer side of the planet carrier (3) and extend out of the side wall of the planet carrier (3) to engage with the inner wall of the secondary ring gear (12); the side wall of the output shaft (6) is provided with external teeth (13) in the lower part and extends into the planet carrier (3) to engage with the plurality of third planetary gears (73). The axial outer end surface of the planet carrier (3) is outwardly provided with a connecting sleeve (14), and the output shaft (6) is connected to the connecting sleeve (14) through an outer ring stamping roller bearing (15).

7. A small-ratio planetary row and fixed-axle gear coupling electric machine according to claim 6, characterized in that: ​ 8. A small-ratio planetary array and fixed-axle gear coupling electric machine according to claim 7, characterized in that: The axial inner end of the primary ring gear (11) forms a connecting ring (16), and the motor shaft (2) is connected to the connecting ring (16) through a deep groove ball bearing (10).

9. A small-ratio planetary row and fixed-axle gear coupling electric machine according to claim 8, characterized in that: The connecting sleeve (14) is connected to the rear end cover (8) through a deep groove ball bearing (10), and a sealing ring (17) is arranged between the connecting sleeve (14) and the output shaft (6), and the sealing ring (17) is arranged between the axial outer ends of the output shaft (6) and the planet carrier (3), the axial inner ends of the planet carrier (3) and the output shaft (6), and the axial inner end of the planet carrier (3) and the primary ring gear (11), and a circular ring roller bearing (18) is arranged.

10. A small-ratio planetary row and fixed-axle gear coupling electric machine according to claim 1, characterized in that: Each set of planetary gear sets includes 4 planetary gears arranged circumferentially on the planet carrier (3).

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