Hub motor with short axial structure

Abstract

The utility model provides a hub motor with a short axial structure, which is characterized in that a planet carrier is convexly provided with a connecting disc, the end surface of the connecting disc extends out of a box body and is provided with a plurality of connecting holes, and the connecting holes are used for fixing the connecting disc on external equipment. Therefore, the connecting disc provided with the connecting hole replaces a fixed shaft to be fixed with external equipment, so that the axial space occupied by the hub motor is greatly shortened; in addition, higher load bearing capacity can be provided by connecting through the connecting disc, and the connecting device is suitable for a higher-strength working environment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of in -wheel motor, concretely relates to a short axial structure's in -wheel motor. BACKGROUND

[0002] The in -wheel motor is a kind of driving technology that motor is directly integrated in the wheel hub of vehicle.It eliminates the complex mechanical transmission components (such as clutch, gearbox, transmission shaft, differential, etc.) in traditional automobile or electric vehicle, realizes the high integration and flattening of power system.

[0003] Chinese patent document CN202521662810.3 discloses a kind of in -wheel motor, it is provided with flat plane and thread on fixed shaft, further ensure the firmness when fixed shaft is connected with external equipment.The connection mode of the above-mentioned fixed shaft, it needs to occupy more axial space for the whole in -wheel motor, in addition, under high load or severe working environment, the load bearing capacity of fixed shaft is lower. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model aims at providing a kind of short axial structure's in -wheel motor, it is designed to solve the problem that fixed shaft is provided with flat plane and thread and is connected with external equipment in prior art, it needs to occupy more axial space for the whole in -wheel motor, in addition, under high load or severe working environment, the load bearing capacity of fixed shaft is lower.

[0005] The utility model provides a kind of short axial structure's in -wheel motor, including box, planet carrier, planet wheel, motor assembly and wire, the box has accommodating cavity, the planet carrier and the motor assembly are located in the accommodating cavity, the planet carrier is provided with connecting disc, the end surface of the connecting disc extends to the outside of the box and is provided with connecting hole, the connecting hole is equipped with several, several connecting holes are evenly distributed around the central axis of the connecting disc, the connecting hole is used to fix the connecting disc on external equipment, the planet wheel is rotatably connected on the planet carrier and is equipped with several, several planet wheels are evenly spaced and distributed around the central axis of the planet carrier, wire-through hole is opened in the planet carrier, the central axis of the wire-through hole is coaxially arranged with the rotation axis of the planet wheel, one end of the wire is connected to the motor assembly, the other end extends to the outside of the connecting disc through the wire-through hole, the motor assembly is driven by the planet wheel to rotate the box relative to the connecting disc.

[0006] According to some embodiments of the utility model, the end surface of the connecting disc extending to the outside of the box is provided with positioning protrusion, the positioning protrusion is used to realize the positioning of the connecting disc and external equipment when the connecting disc is fixed on external equipment.

[0007] According to some embodiments of the present application, the end surface of the connecting disc extending out of the box is concavely provided with a weight-reducing groove.

[0008] According to some embodiments of the present application, the threading through hole is located at the bottom of the weight-reducing groove.

[0009] According to some embodiments of the present application, the outer circumferential side of the connecting disc is provided with a first step portion, the first step portion is sleeved with a protective ring, an oil seal is arranged between the outer circumferential side of the protective ring and the inner circumferential side of the box, and the oil seal is used for sealing the accommodating cavity.

[0010] According to some embodiments of the present application, the motor assembly comprises a sun gear, a stator, a rotor and a motor shaft, the stator is fixedly arranged relative to the planet carrier, one end of the motor shaft is fixedly connected with the rotor, the other end of the motor shaft is connected with the sun gear, the sun gear is engaged with the planetary gear, the box is provided with a gear ring engaged with the planetary gear, and the stator is used for driving the rotor to rotate together with the motor shaft relative to the planet carrier, thereby driving the sun gear to rotate.

[0011] According to some embodiments of the present application, the motor assembly further comprises a driving plate, the driving plate is fixedly arranged relative to the planet carrier, the driving plate is located in the gap between the planet carrier and the stator, and one end of the wire is connected to the driving plate.

[0012] According to some embodiments of the present application, the planet carrier is provided with a mounting chamber, a first bearing is press-fitted in the mounting chamber, the outer ring of the first bearing is connected to the inner wall surface of the mounting chamber, the inner ring of the first bearing is connected to the shaft body of the motor shaft, wave springs and spacers are stacked between the inner ring of the first bearing and the rotor, one side of the wave spring abuts against the inner ring of the first bearing, the other side of the wave spring abuts against the spacer, and the other side of the spacer abuts against the rotor.

[0013] According to some embodiments of the present application, the end of the motor shaft connected with the rotor penetrates the rotor and is connected with a second bearing, the outer ring of the second bearing is connected to the inner wall surface of the box, and the inner ring of the second bearing is connected to the shaft body of the motor shaft.

[0014] According to some embodiments of the present application, the box comprises an upper shell and a lower shell which are mutually covered, an accommodating cavity is formed between the lower shell and the upper shell, a second step portion and a third step portion are arranged at the connection between the lower shell and the upper shell, the diameters of the second step portion and the third step portion are different, a second sealing ring is sleeved on the second step portion, and a third sealing ring is sleeved on the third step portion.

[0015] Beneficial effects: the utility model provides a wheel hub motor of short axial structure, because the planet carrier is protruding with the connecting disc, the end face of connecting disc extends to the box body outside and is provided with the connecting hole, the connecting hole is equipped with several, the connecting hole is used for fixing the connecting disc on the external equipment, therefore, the present application replaces the fixed axle and external equipment fixed through the connecting disc with the connecting hole, greatly shortens the axial space of wheel hub motor occupied, in addition, the higher load bearing capacity can be provided through the connecting disc connection, and it is applicable to higher strength working environment. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed in the embodiments will be briefly introduced as follows, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor under the premise of the drawings.

[0017] Figure 1 It is the structural schematic diagram of wheel hub motor of short axial structure of the utility model;

[0018] Figure 2 It is Figure 1 It is the sectional view of A-A direction;

[0019] Figure 3 It is the structural schematic diagram of planet wheel and planet carrier connection;

[0020] Figure 4 It is the structural schematic diagram of another view of planet wheel and planet carrier connection.

[0021] In the drawing: 1, box body;11, second bearing;12, upper shell;13, lower shell;14, second step portion;15, third step portion;16, second sealing ring;17, third sealing ring;2, planet carrier;21, connecting disc;211, connecting hole;212, positioning protrusion;213, weight reduction groove;214, first step portion;215, protective ring;216, oil seal;22, threading through hole;23, mounting chamber;231, first bearing;232, wave spring;233, gasket;3, planet wheel;4, motor assembly;41, sun gear;42, stator;43, rotor;44, motor shaft;45, driving plate;5, wire. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0023] Please refer to Figures 1 to 4 The utility model provides a kind of hub motor of short axial structure, including box 1, planet carrier 2, planetary gear 3, motor assembly 4 and wire 5, the box 1 has accommodating cavity, the planet carrier 2 and the motor assembly 4 are located in the accommodating cavity, the planet carrier 2 is protruded with connecting disc 21, the end surface of the connecting disc 21 extends to the outside of the box 1 and is equipped with connecting hole 211, the connecting hole 211 is equipped with several, several connecting hole 211 is evenly distributed around the central axis of the connecting disc 21 circumferentially, the connecting hole 211 is used to be fixed on external equipment with the connecting disc 21, the planetary gear 3 is rotationally connected on the planet carrier 2 and is equipped with several, several planetary gear 3 is evenly spaced and distributed around the central axis of the planet carrier 2 circumferentially, the planet carrier 2 is equipped with threading through hole 22, the central axis of the threading through hole 22 is coaxially arranged with the rotation axis of the planetary gear 3, one end of the wire 5 is connected to the motor assembly 4, and the other end extends to the outside of the connecting disc 21 through the threading through hole 22, the motor assembly 4 drives the box 1 relative to the connecting disc 21 rotationally through the planetary gear 3.

[0024] In the application, by connecting the connecting disc 21 with external equipment, the axial space occupied by the hub motor can be shortened. In addition, connecting through the connecting disc 21 can provide higher load bearing capacity and be suitable for higher strength working environment. Specifically, the connecting hole 211 can be a threaded hole. When installing, the bolt is screwed into the external equipment and the threaded hole in sequence, so as to install the connecting disc 21 on the external equipment. Further, the design of the connecting disc 21 not only enhances the structural strength, but also facilitates installation and disassembly, and improves the maintenance convenience of the hub motor. Under the action of the planetary gear 3, the motor assembly 4 can stably transmit power to the box 1, realize the speed reduction effect, and ensure the operation efficiency and stability of the hub motor. It is worth noting that since the wire 5 extends to the outside of the connecting disc 21 directly through the threading through hole 22, there is a gap between the wire 5 and the threading through hole 22, which causes the external pollutants to enter the accommodating cavity of the box from the gap between them. Therefore, the gap between the wire 5 and the threading through hole 22 needs to be filled with glue for sealing.

[0025] According to some embodiments of the present application, the end face of the connecting disc 21 extending out of the box 1 is provided with a positioning protrusion 212, which is used to position the connecting disc 21 and the external device when the connecting disc 21 is fixed to the external device. In this embodiment, the positioning protrusion 212 is provided to quickly and accurately position and align the connecting disc 21 and the external device during installation, avoiding misalignment during installation and further improving installation efficiency and accuracy. Specifically, the positioning protrusion 212 can be cylindrical, conical or other shapes, as long as it can meet the positioning function.

[0026] According to some embodiments of the present application, the connecting disc 21 extending out of the box 1 is provided with a weight reduction groove 213 on the end face. In this embodiment, the weight reduction groove 213 can optimize the weight of the entire hub motor and improve its lightweight level. The weight reduction groove 213 can effectively reduce the use of materials without affecting the structural strength and rigidity of the connecting disc 21, thereby reducing the weight of the entire hub motor.

[0027] According to some embodiments of the present application, the threading passage 22 is located at the bottom of the weight reduction groove 213. In this embodiment, the threading passage not only can reasonably utilize the space of the weight reduction groove 213, but also can protect the wire 5 from external damage, while facilitating the wiring and arrangement of the wire 5. The wire 5 extends into the weight reduction groove 213 through the threading passage, avoiding direct exposure of the wire 5 on the outside of the connecting disc 21, which can effectively avoid friction between the wire 5 and external equipment or other components during installation, improving the safety and reliability of the wire 5. Taking the planetary gear with three as an example, due to the setting of the weight reduction groove 213, when the planetary gear 3 is installed radially into the planet carrier 2, it can directly pass through the bottom of the weight reduction groove 213 and the planetary gear 3 through two solid shafts in turn, and then rivet the planetary gear 3 on the planet carrier 2 to constrain and position the planetary gear 3. Another hollow shaft is riveted at the threading passage position, which is convenient and fast to install.

[0028] According to some embodiments of the utility model, the outer circumferential side of connecting disc 21 is equipped with first step portion 214, first step portion 214 is equipped with protection ring 215, the outer circumferential side between protection ring 215 and the inner circumferential side of box 1 is equipped with oil seal 216, and oil seal 216 is used for sealing containing cavity. In actual application, in order to realize the lightweight of hub motor, planet carrier 2 usually adopts aluminum alloy casting, but because the aluminum alloy material is relatively soft, the surface hardness is low. The lip of oil seal 216 needs to be in contact with the surface of planet carrier 2 with certain pressure and high-speed relative motion all the time. If oil seal 216 directly rubs with the surface of aluminum alloy, the aluminum alloy will be quickly abraded, groove is generated, and sealing failure is caused. Protection ring 215 usually adopts steel (usually high-carbon steel or stainless steel), and the texture is hard, the surface is subjected to fine grinding and hardening treatment (such as chrome plating, nitriding or heat treatment), and has higher wear resistance. Therefore, planet carrier 2 in the embodiment adopts aluminum alloy, realizes lightweight and good structural forming, protection ring 215 provides wear resistance and sealing surface, and realizes long-term reliable dynamic sealing. Protection ring 215 is sleeved on planet carrier 2 in the mode of interference fit (press fit), so that the steel ring does not loosen or fall off in the process of high-speed rotation of box 1.

[0029] According to some embodiments of the utility model, motor assembly 4 includes sun gear 41, stator 42, rotor 43 and motor shaft 44, stator 42 is fixedly arranged relative to planet carrier 2, one end of motor shaft 44 is fixedly connected with rotor 43, the other end is connected with sun gear 41, sun gear 41 is engaged with planetary gear 3, and the gear ring engaged with planetary gear 3 is arranged on box 1, stator 42 is used to drive rotor 43 to rotate together with motor shaft 44 relative to planet carrier 2, and then drives sun gear 41 to rotate. Specifically, sun gear 41 is provided with one, and planetary gear 3 is provided with three. Three planetary gears 3 are evenly distributed on planet carrier 2, and power dispersion and transmission are realized through the engagement with sun gear 41. The gear ring is fixedly arranged on box 1 and is engaged with the outer teeth of planetary gear 3, forming a planetary gear transmission mechanism. When motor assembly 4 starts, power is transmitted to planetary gear 3 through sun gear 41, and planetary gear 3 drives the gear ring and box 1 to rotate, so that the overall rotation output of the hub motor is realized. This structure is not only compact, but also has high transmission efficiency, which can effectively improve the overall performance of the hub motor.

[0030] According to some embodiments of the utility model, the motor assembly 4 further includes a driving plate 45, the driving plate 45 is fixedly arranged relative to the planetary carrier 2, the driving plate 45 is located in the gap between the planetary carrier 2 and the stator 42, and one end of the wire 5 is connected to the driving plate 45. In the embodiment, the driving plate 45 is integrated in the gap between the planetary carrier 2 and the stator 42, the axial space inside the motor is fully utilized, additional axial length is avoided, and the short axial structure design of the in-wheel motor is further optimized.

[0031] According to some embodiments of the utility model, the planetary carrier 2 is provided with a mounting chamber 23, the first bearing 231 is press-fitted in the mounting chamber 23, the outer ring of the first bearing 231 is connected to the inner wall surface of the mounting chamber 23, the inner ring of the first bearing 231 is connected to the shaft body of the motor shaft 44, the wave spring 232 and the gasket 233 are laminated between the inner ring of the first bearing 231 and the rotor 43, one side of the wave spring 232 abuts against the inner ring of the first bearing 231, the other side abuts against the gasket 233, and the other side of the gasket 233 abuts against the rotor 43. In the embodiment, the wave spring 232 generates a pre-tightening force between the first bearing 231 and the rotor 43, can absorb and buffer the vibration generated by the rotation of the rotor 43, effectively avoids the axial movement of the rotor 43, provides an effective shock absorption function for the whole structure, and ensures that the influence of vibration on the in-wheel motor is reduced when the in-wheel motor is running. Preferably, the first bearing 231 is a double-ball bearing.

[0032] According to some embodiments of the utility model, the motor shaft 44 is connected to the rotor 43 at one end, the rotor 43 is penetrated by the second bearing 11, and the second bearing 11 is connected, the outer ring of the second bearing 11 is connected to the inner wall surface of the box body 1, and the inner ring of the second bearing 11 is connected to the shaft body of the motor shaft 44. In the embodiment, the first bearing 231 and the second bearing 11 cooperate with each other to provide two support points, and the stability of the motor shaft 44 during rotation is improved.

[0033] According to some embodiments of the utility model, the box 1 includes mutually cover and close upper casing 12 and lower casing 13, the lower casing 13 and the upper casing 12 form the accommodation cavity between, the junction of lower casing 13 and upper casing 12 is equipped with second step portion 14 and third step portion 15, the diameter of second step portion 14 and third step portion 15 is not same, second sealing ring 16 is set on second step portion 14, third sealing ring 17 is set on third step portion 15, wherein, second step portion 14 and third step portion 15 form the misalignment fit structure through the diameter difference, second sealing ring 16 and third sealing ring 17 form double seal, improve the sealing reliability, at the same time, upper casing 12 and lower casing 13 are connected through bolt fastening, bolt is evenly distributed along the circumferential direction, further strengthen the compactness of the connection of both, avoid the shell junction loosening due to vibration and influence the sealing effect.

[0034] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and range of the essential elements of the claims. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0035] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A short-axial-structure wheel hub motor, characterized in that, The application relates to a motor assembly, which comprises a box (1), a planet carrier (2), a planet wheel (3), a motor assembly (4) and a wire (5), the box (1) has a containing cavity, the planet carrier (2) and the motor assembly (4) are located in the containing cavity, a connecting disc (21) is protruded on the planet carrier (2), the end surface of the connecting disc (21) extends to the outside of the box (1) and is provided with connecting holes (211), the connecting holes (211) are uniformly distributed around the central axis of the connecting disc (21) in the circumferential direction, the connecting holes (211) are used for fixing the connecting disc (21) to external equipment, the planet wheel (3) is rotationally connected to the planet carrier (2) and is provided with a plurality of planet wheels (3) which are uniformly and spacedly distributed around the central axis of the planet carrier (2) in the circumferential direction, a wire-through hole (22) is formed in the planet carrier (2), the central axis of the wire-through hole (22) is coaxially arranged with the rotation axis of the planet wheel (3), one end of the wire (5) is connected to the motor assembly (4), the other end of the wire (5) extends to the outside of the connecting disc (21) through the wire-through hole (22), and the motor assembly (4) drives the box (1) to rotate relative to the connecting disc (21) through the planet wheel (3).

2. The short-axial-structure wheel motor according to claim 1, characterized by A positioning protrusion (212) is arranged on the end surface of the connecting disc (21) extending to the outside of the box (1), and the positioning protrusion (212) is used for positioning the connecting disc (21) and external equipment when the connecting disc (21) is fixed to the external equipment.

3. The short-axial-structure wheel motor according to claim 1, characterized by, A lightening groove (213) is recessed on the end surface of the connecting disc (21) extending to the outside of the box (1).

4. The short-axial-structure wheel motor according to claim 3, characterized by The wire-through hole (22) is located at the bottom of the lightening groove (213).

5. The short-axial-structure wheel motor according to claim 1, characterized by, A first stepped portion (214) is arranged on the outer circumferential side of the connecting disc (21), a protection ring (215) is sleeved on the first stepped portion (214), an oil seal (216) is arranged between the outer circumferential side of the protection ring (215) and the inner circumferential side of the box (1), and the oil seal (216) is used for sealing the containing cavity.

6. The short-axial-structure wheel motor according to claim 1, characterized by The motor assembly (4) comprises a sun gear (41), a stator (42), a rotor (43) and a motor shaft (44), the stator (42) is fixedly arranged relative to the planet carrier (2), one end of the motor shaft (44) is fixedly connected with the rotor (43), the other end of the motor shaft (44) is connected with the sun gear (41), the sun gear (41) is engaged with the planet wheel (3), a gear ring engaged with the planet wheel (3) is arranged on the box (1), the stator (42) is used for driving the rotor (43) and the motor shaft (44) to rotate relative to the planet carrier (2), and the sun gear (41) is further driven to rotate.

7. The short-axial-structure wheel motor according to claim 6, characterized by The motor assembly (4) further comprises a driving plate (45) fixedly arranged relative to the planet carrier (2), the driving plate (45) being located in a gap between the planet carrier (2) and the stator (42), and one end of the wire (5) being connected to the driving plate (45).

8. The short-axial-structure wheel motor according to claim 6, characterized by The planet carrier (2) is provided with a mounting chamber (23), the first bearing (231) being press-fitted in the mounting chamber (23), the outer ring of the first bearing (231) being connected to the inner wall surface of the mounting chamber (23), the inner ring of the first bearing (231) being connected to the shaft body of the motor shaft (44), the wave spring (232) and the gasket (233) being stacked between the inner ring of the first bearing (231) and the rotor (43), one side of the wave spring (232) abutting against the inner ring of the first bearing (231), the other side of the wave spring (232) abutting against the gasket (233), the other side of the gasket (233) abutting against the rotor (43).

9. The short-axial-structure wheel motor according to claim 6, characterized by The motor shaft (44) is connected to the rotor (43) at one end, the rotor (43) being penetrated by the second bearing (11), the outer ring of the second bearing (11) being connected to the inner wall surface of the box body (1), and the inner ring of the second bearing (11) being connected to the shaft body of the motor shaft (44).

10. The short-axial-structure wheel motor according to claim 1, characterized by, The box body (1) comprises an upper shell (12) and a lower shell (13) which are overlapped, the accommodating cavity being formed between the lower shell (13) and the upper shell (12), the connecting portion of the lower shell (13) and the upper shell (12) being provided with a second stepped portion (14) and a third stepped portion (15), the diameters of the second stepped portion (14) and the third stepped portion (15) being different, the second sealing ring (16) being sleeved on the second stepped portion (14), and the third sealing ring (17) being sleeved on the third stepped portion (15).

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