Power assembly

Abstract

The utility model discloses a power assembly, and relates to the technical field of motor driving. The motor comprises a rotor and a stator, and the rotor is coaxially and rotatably arranged in the stator; the rotor comprises an annular magnet, a plurality of bridge arms and a shaft barrel, and the shaft barrel is connected to the interior of the annular magnet through the bridge arms; wherein the plurality of bridge arms are located at the axial bottom end of the rotor, and the thickness of the plurality of bridge arms in the axial direction is smaller than the axial length of the rotor, so that an accommodating space is formed between the bridge arms and the top end of the rotor. The structure of the motor has the advantages of saving materials and being light in weight, the power assembly fully utilizes the containing space formed by the motor, on one hand, the axial space of the power assembly is shortened, and on the other hand, the structure of the power assembly is more compact.

Description

Technical Field

[0001] This utility model relates to the field of motor drive technology, specifically to a power component. Background Technology

[0002] Motor drive technology has been widely used in robots, automobiles, and other equipment. Taking automobiles as an example, hub motors are used as power components in electric engineering vehicles. These vehicles have four wheels, each with its own hub motor, allowing for independent drive of all four wheels.

[0003] The in-wheel motor is located inside the wheel hub and integrates the motor, reducer, and other mechanisms. The in-wheel motor is directly embedded inside the wheel and transmits power through two sets of planetary gear reducers. This design integrates the drive system's motor, reduction mechanism, and braking device all within the wheel hub, significantly simplifying the vehicle's mechanical structure.

[0004] The compactness of the hub motor's structure is an important indicator of its advancement. Therefore, how to design a compact hub motor is a problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to design a compact power component for use in robots, automobiles and other equipment.

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0007] A power assembly includes an electric motor, which includes a rotor and a stator, the rotor being rotatably disposed coaxially within the stator; the rotor includes an annular magnet, multiple bridge arms, and a shaft sleeve, the shaft sleeve being connected to the interior of the annular magnet via the multiple bridge arms; wherein the multiple bridge arms are located at the bottom end of the rotor in the axial direction, and the thickness of the multiple bridge arms in the axial direction is shorter than the axial length of the rotor, such that a receiving space is formed between the bridge arms and the top end of the rotor.

[0008] A transmission device, driven by the motor, extends at least partially into the receiving space in the axial direction;

[0009] The housing assembly internally houses and connects the motor and the transmission device.

[0010] Furthermore, the transmission shaft has one end connected to the inner wall of the shaft cylinder and the other end forming a gear portion, which is configured to engage with the gear assembly in the transmission device.

[0011] Furthermore, the input end housing has its circumferential inner wall connected to the circumferential outer wall of the stator of the motor;

[0012] A flange seat, which is connected to the end face of the input end housing, and forms multiple steps in a diameter-reducing manner toward the motor, such that its outer wall presses against the stator in the axial direction, and its portion extends into the interior of the rotor.

[0013] The output end housing has one end connected to the flange seat, and the transmission device is disposed in the cavity formed by the flange seat and the output end housing.

[0014] Furthermore, the transmission device includes at least one stage planetary reduction mechanism, the first stage planetary reduction mechanism comprising:

[0015] A primary gear ring is disposed inside the flange seat and connected to an annular stepped surface of the flange seat;

[0016] A primary planetary carrier is disposed inside the flange seat, and a plurality of primary planetary gears are rotatably disposed on its ring at intervals. The gear part of the drive shaft is disposed inside its axial direction. The plurality of primary planetary gears are in transmission engagement with the gear part of the drive shaft and the primary ring gear, so that the primary planetary carrier rotates under the drive of the drive shaft.

[0017] Furthermore, the transmission device also includes a two-stage planetary reduction mechanism, which comprises:

[0018] A secondary gear ring is connected to the end face of the flange seat and is located inside the output end housing;

[0019] The secondary planetary carrier has multiple secondary planetary gears arranged rotatably upwards on its rings. A secondary sun gear is arranged in the axial center of the secondary planetary carrier. The secondary sun gear is coaxially connected to the axial output end of the primary planetary carrier. The multiple secondary planetary gears are in drive engagement with the secondary sun gear and the secondary ring gear, so that the secondary planetary carrier rotates under the drive of the drive shaft. The output end of the secondary planetary carrier is exposed through the axial through hole of the output end housing.

[0020] Furthermore, the first bearing is connected to the inner end of the input end housing, and its inner ring is connected to the lower end of the rotor's cylinder circumferentially to the outer wall.

[0021] The second bearing has its inner ring connected to the bottom end of the first-stage planetary carrier and circumferentially to the outer wall, and its outer ring connected to the bottom end of the flange seat and circumferentially to the inner wall.

[0022] The third bearing has its inner ring connected to the upper end of the shaft cylinder and circumferentially to the outer wall, and its outer ring connected to the bottom end of the first-stage planetary carrier and circumferentially to the inner wall. The third bearing is located radially inside the second bearing.

[0023] Furthermore, the fourth bearing has its inner ring connected to the bottom circumferential outer wall of the secondary planetary carrier, and its outer ring connected to the circumferential inner wall of the flange seat;

[0024] The fifth bearing has its inner ring connected to the top of the first-stage planetary carrier and circumferentially to the outer wall, and its outer ring connected to the bottom of the second-stage planetary carrier and circumferentially to the inner wall. The fifth bearing is located radially inside the fourth bearing.

[0025] The sixth bearing has its outer ring connected to the inner end of the output end housing and its outer ring connected to the circumferential outer wall of the top of the secondary planetary carrier.

[0026] Furthermore, it also includes an encoder component, the encoder component comprising:

[0027] A rotating part is connected to the bottom end of the drive shaft and rotates synchronously with the drive shaft;

[0028] A fixed part is connected to the input end shell of the housing assembly and faces the rotating part, and converts the sensed angular displacement of the rotating part into an electrical signal.

[0029] Furthermore, the outer surface of the input end shell is provided with a ring array of heat dissipation grooves, and heat dissipation teeth are formed between adjacent heat dissipation grooves.

[0030] Furthermore, the power component is a hub motor assembly or a joint motor assembly.

[0031] The beneficial effects of this utility model are as follows: the structure of the motor of this power assembly has the advantages of saving materials and light weight, and the power assembly makes full use of the space formed by the motor, which shortens the axial space of the power assembly on the one hand, and makes the structure of the power assembly more compact on the other hand. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0033] Figure 2 This is an assembly drawing of this utility model;

[0034] Figure 3 This is a utility model Figure 1 Assembly drawing;

[0035] Figure 4 This is a three-dimensional schematic diagram of the housing assembly of this utility model;

[0036] Figure 5 This is a three-dimensional structural diagram of the primary planetary carrier of this utility model;

[0037] Figure 6 This is a three-dimensional structural diagram of the secondary planetary carrier of this utility model;

[0038] Figure 7 This is a schematic diagram of some parts of the motor in this utility model;

[0039] Figure 8 This is a schematic diagram of the components of the two-stage planetary reduction mechanism of this utility model;

[0040] Figure 9 This is a schematic diagram of the overall design of this utility model;

[0041] Reference numerals: 1. Motor; 11. Rotor; 111. Ring magnet; 112. Bridge arm; 113. Shaft cylinder; 12. Stator; 2. Accommodation space; 3. Transmission device; 31. First-stage planetary reduction mechanism; 311. First-stage gear ring; 312. First-stage planetary carrier; 313. First-stage planetary gear; 32. Second-stage planetary reduction mechanism; 321. Second-stage gear ring; 322. Second-stage planetary carrier; 323. Second-stage planetary gear; 324. Second-stage sun gear; 4. Housing assembly; 41. Input end housing; 42. Flange seat; 43. Output end housing; 5. Drive shaft; 51. Gear section; 6. First bearing; 7. Second bearing; 8. Third bearing; 9. Fourth bearing; 10. Fifth bearing; 13. Encoder assembly; 14. Heat dissipation groove; 15. Heat dissipation tooth. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0043] This embodiment provides a power assembly that can be used in devices such as robots and automobiles. For example, the power assembly can be a car wheel hub motor assembly or a robot joint motor assembly. The following technical solution is provided, which will be discussed in conjunction with... Figures 1-9 Please provide a detailed explanation: Example

[0044] A power assembly includes a motor 1, a transmission device 3, and a housing assembly 4. The motor 1, serving as a power source, mainly includes a rotor 11 and a stator 12. Specifically, the rotor 11 is coaxially rotatable inside the stator 12. The rotor 11 includes an annular magnet 111, multiple bridge arms 112, and a shaft cylinder 113. The shaft cylinder 113 is connected to the interior of the annular magnet 111 via the multiple bridge arms 112. The multiple bridge arms 112 are located at the bottom end of the rotor 11 along its axial direction, and the thickness of the multiple bridge arms 112 is shorter than the axial length of the rotor 11, thus forming a receiving space 2 between the bridge arms 112 and the top end of the rotor 11. (See also...) Figure 1 and Figure 4 The transmission device 3 is driven by the motor 1 and extends at least partially into the receiving space 2 in the axial direction. The motor 1 and the transmission device 3 are connected and housed inside the housing assembly 4.

[0045] The motor structure of this power assembly has the advantages of saving materials and being lightweight. In addition, the power assembly makes full use of the space formed by the motor, which shortens the axial space of the power assembly on the one hand, and makes the structure of the power assembly more compact on the other hand.

[0046] In this embodiment, a drive shaft 5 is also designed, which is used to connect the power source motor 1 and the transmission device 3. Specifically, one end of the drive shaft 5 is connected and fixed to the inner wall of the shaft cylinder 113, and the connection method is radial screw locking or key connection. The other end forms a gear part 51, which is configured to cooperate with the gear assembly in the transmission device 3.

[0047] Please see Figure 3 and Figure 4 The housing assembly 4 includes an input end housing 41, a flange seat 42, and an output end housing 43. The outer ring of the stator 12 is fixedly mounted on the inner wall of the input end housing 41. The flange seat 42 is fixed to the end face of the input end housing 41 by screws and forms multiple steps with a gradually decreasing diameter towards the motor 1, so that its outer wall presses the stator 12 axially, thereby fixing the stator 12 and partially extending into the inner ring of the rotor 11. The output end housing 43 is connected to the other side of the flange seat 42, and the cavity formed by the flange seat 42 and the output end housing 43 is used to install the transmission device 3. The flange seat 42 is not only used to fix the transmission device 3 (here, the first-stage planetary reduction mechanism 31), but also to connect the input end housing 41 and the output end housing 43 together.

[0048] In this embodiment, please refer to Figures 3 to 8 The gear assembly mentioned in transmission device 3 refers to a two-stage reduction mechanism, specifically including a first-stage planetary reduction mechanism 31 and a second-stage planetary reduction mechanism 32. The number is not limited; multiple stages of reduction mechanisms are possible. Other reduction methods, such as worm gear reducers, can also be used. The first-stage reduction mechanism includes a first-stage gear ring 311 fixed on the inner ring step of the flange seat 42, and a first-stage planet carrier 312 located inside the flange seat 42 and containing multiple first-stage planetary gears 313 that rotate circumferentially at intervals. Please refer to [link / reference needed]. Figure 3 and Figure 4 The first-stage planetary carrier 312 here is a columnar fitting with multiple mounting slots arranged in a ring-shaped manner. The mounting slots are used to rotatably mount the first-stage planetary gears 313 to form the entire planetary structure. The first-stage planetary gears 313 are in transmission engagement with the first-stage gear ring 311. At the same time, the gear part 51 of the drive shaft 5 is located axially inside the planetary carrier and meshes with the multiple first-stage planetary gears 313 to drive the first-stage planetary carrier 312 to rotate under the drive of the drive shaft 5.

[0049] Please see Figure 3 and Figure 5The secondary reduction mechanism includes a secondary gear ring 321 located inside the output end housing 43 and fixed to the end face of the connecting flange seat 42, and a secondary planetary carrier 322 disposed inside the secondary gear ring 321. The structure of the secondary planetary carrier 322 is similar to that of the primary planetary carrier 312. Both have multiple secondary planetary gears 323 rotatably arranged in the ring direction, and a secondary sun gear 324 is disposed in the axial center. The secondary sun gear 324 is coaxially connected to the axial output end of the primary planetary carrier 312. Here, the secondary sun gear 324 meshes with the secondary planetary gears 323 and the secondary gear ring 321, so that the secondary planetary carrier 322 rotates under the drive of the transmission shaft 5. At the same time, the output end of the secondary planetary carrier 322 exposes the axial through hole of the output end housing 43. This axial through hole is used for mounting vehicle wheel hubs and other connecting fits.

[0050] In this embodiment, to reduce friction and achieve effective axial rotation, a first bearing 6, a second bearing 7, a third bearing 8, a fourth bearing 9, a fifth bearing 10, and a sixth bearing are also included. The first bearing 6 is connected to the inner end of the input end housing 41, and its inner ring is connected to the lower end of the shaft cylinder 113 of the rotor 11, circumferentially towards the outer wall. The second bearing 7 has its inner ring connected to the bottom end of the first-stage planetary carrier 312, circumferentially towards the outer wall, and its outer ring connected to the bottom end of the flange seat 42, circumferentially towards the inner wall. The third bearing 8 has its inner ring connected to the upper end of the shaft cylinder 113, circumferentially towards the outer wall, and its outer ring connected to the bottom end of the first-stage planetary carrier 312, circumferentially towards the inner wall. The third bearing 8 is located radially inside the second bearing 7. The fourth bearing 9 has its inner ring connected to the bottom circumferential outer wall of the secondary planetary carrier 322, and its outer ring connected to the circumferential inner wall of the flange seat 42; the fifth bearing 10 has its inner ring connected to the top circumferential outer wall of the primary planetary carrier 312, and its outer ring connected to the bottom circumferential inner wall of the secondary planetary carrier 322, and the fifth bearing 10 is located radially inside the fourth bearing 9; the sixth bearing has its outer ring connected to the inner end of the output end housing 43, and its outer ring connected to the top circumferential outer wall of the secondary planetary carrier 322. Through the arrangement of the bearings, the rotational friction of the rotating parts is effectively reduced, thus reducing losses. Example

[0051] This embodiment adds the following technical solution to Embodiment 1: it also includes an encoder assembly 13, which includes: a rotating part connected to the bottom end of the drive shaft 5 and rotating synchronously with the drive shaft 5; and a fixed part connected to the input end shell 41 of the housing assembly 4 and facing the rotating part, which converts the sensed angular displacement of the rotating part into an electrical signal. For example, a mounting platform is fixed at the end of the drive shaft 5 away from the first-stage sun gear, and a cylinder is constructed on the mounting platform, with a magnet sleeved on the cylinder; a connecting seat is provided at the inner ring of the input end shell 41, and a magnetic sensor is installed on the connecting seat. This part is the fixed part, realizing the acquisition of data such as the rotational position and speed of the motor 1. Example

[0052] Based on Embodiment 1, this embodiment adds the following technical solution: heat dissipation grooves 14 are distributed in a ring array on the outer surface of the input end shell 41, and heat dissipation teeth 15 are formed between adjacent heat dissipation grooves 14. The design of the heat dissipation grooves 14 enables the heat dissipation function of the motor 1 structure.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power component, characterized in that, include: The motor (1) includes a rotor (11) and a stator (12), the rotor (11) being coaxially rotatably disposed inside the stator (12); the rotor (11) includes an annular magnet (111), multiple bridge arms (112) and a shaft sleeve (113), the shaft sleeve (113) being connected to the interior of the annular magnet (111) through the multiple bridge arms (112); wherein, the multiple bridge arms (112) are located at the bottom end of the rotor (11) in the axial direction, and the thickness of the multiple bridge arms (112) in the axial direction is shorter than the axial length of the rotor (11), so that a receiving space (2) is formed between the bridge arms (112) and the top end of the rotor (11). The transmission device (3) is driven by the motor (1) and extends at least partially into the receiving space (2) in the axial direction; The housing assembly (4) houses and connects the motor (1) and the transmission device (3).

2. The power assembly according to claim 1, characterized in that, Also includes: A drive shaft (5) has one end connected to the inner wall of the shaft cylinder (113) and the other end formed with a gear part (51), which is configured to engage with the gear assembly in the transmission device (3).

3. The power assembly according to claim 2, characterized in that, The housing assembly (4) includes: The input end housing (41) has its inner circumferential wall connected to the outer circumferential wall of the stator (12) of the motor (1); The flange (42) is connected to the end face of the input end housing (41) and forms multiple steps toward the motor (1) in a diameter-reducing manner, so that its outer wall presses against the stator (12) in the axial direction and its part extends into the interior of the rotor (11). The output end housing (43) is connected at one end to the flange seat (42), and the transmission device (3) is disposed in the cavity formed by the flange seat (42) and the output end housing (43).

4. The power assembly according to claim 3, characterized in that, The transmission device (3) includes at least a first-stage planetary reduction mechanism (31), which includes: A primary gear ring (311) is disposed inside the flange seat (42) and connected to an annular stepped surface of the flange seat (42); A primary planetary carrier (312) is disposed inside the flange seat (42), and a plurality of primary planetary gears (313) are rotatably disposed on its ring at intervals. The gear part (51) of the drive shaft (5) is disposed inside its axial direction. The plurality of primary planetary gears (313) are in drive engagement with the gear part (51) of the drive shaft (5) and the primary gear ring (311) so that the primary planetary carrier (312) rotates under the drive of the drive shaft (5).

5. The power assembly according to claim 4, characterized in that, The transmission device (3) further includes a two-stage planetary reduction mechanism (32), which includes: A secondary gear ring (321) is connected to the end face of the flange seat (42) and located inside the output end housing (43); The secondary planetary carrier (322) has multiple secondary planetary gears (323) arranged rotatably upwards on its ring. A secondary sun gear (324) is arranged in the axial center of the secondary planetary carrier (322). The secondary sun gear (324) is coaxially connected to the axial output end of the primary planetary carrier (312). The multiple secondary planetary gears (323) are in transmission cooperation with the secondary sun gear (324) and the secondary gear ring (321) so that the secondary planetary carrier (322) rotates under the drive of the transmission shaft (5). The output end of the secondary planetary carrier (322) is exposed through the axial through hole of the output end housing (43).

6. The power assembly according to claim 4, characterized in that, Also includes: The first bearing (6) is connected to the inner end of the input end housing (41), and its inner ring is connected to the lower end of the shaft sleeve (113) of the rotor (11) circumferentially to the outer wall. The second bearing (7) has its inner ring connected to the bottom end of the first-stage planetary carrier (312) around the outer wall, and its outer ring connected to the bottom end of the flange seat (42) around the inner wall. The third bearing (8) has its inner ring connected to the upper end of the cylinder (113) around the outer wall, and its outer ring connected to the bottom end of the first-stage planetary carrier (312) around the inner wall. The third bearing (8) is located radially inside the second bearing (7).

7. The power assembly according to claim 5, characterized in that, Also includes: The fourth bearing (9) has its inner ring connected to the bottom circumferential outer wall of the secondary planetary carrier (322) and its outer ring connected to the circumferential inner wall of the flange seat (42); The fifth bearing (10) has its inner ring connected to the top of the first-stage planetary carrier (312) around the outer wall, and its outer ring connected to the bottom of the second-stage planetary carrier (322) around the inner wall. The fifth bearing (10) is located radially inside the fourth bearing (9). The sixth bearing has its outer ring connected to the inner end of the output end housing (43) and its outer ring connected to the circumferential outer wall of the top of the secondary planetary carrier (322).

8. The power assembly according to claim 2, characterized in that, It also includes an encoder component (13), which includes: A rotating part is connected to the bottom end of the drive shaft (5) and rotates synchronously with the drive shaft (5); The fixing part is connected to the input end shell (41) of the housing assembly (4) and faces the rotating part, and converts the sensed angular displacement of the rotating part into an electrical signal.

9. The power assembly according to claim 3, characterized in that, The outer surface of the input end shell (41) is provided with a ring array of heat dissipation grooves (14), and heat dissipation teeth (15) are formed between adjacent heat dissipation grooves (14).

10. The power assembly according to any one of claims 1 to 9, characterized in that, The power component is either a hub motor assembly or a joint motor assembly.

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