KR20210051106A - Geared inwheel motor - Google Patents

Abstract

The present invention relates to a geared in-wheel motor. In accordance with an embodiment of the present invention, the geared in-wheel motor comprises: a rim engaged as a tire covers an outer wheel; a shaft connected by penetrating the center of the rim; a motor assembly which includes a stator connected to the shaft in the rim, and a rotor placed to cover the stator, which rotates; a cover engaged to seal an opened part of the rim; and a gear assembly which includes a sun gear fixed on the center of the rotor, a plurality of planetary gears connected to a carrier placed in the rim to cover around the sun gear, and a ring gear placed by covering around the plurality of planetary gears. The gear assembly includes: a fixing shaft which axially connects each of the plurality of planetary gears to one surface of the carrier; and one-way clutches respectively placed between the fixing shaft and the plurality of planetary gears to be linked to the rotation of the rotor and allow or constrain the rotation of the plurality of planetary gears in accordance with the rotation direction of the sun gear. The present invention aims to provide a geared in-wheel motor which is able to output a high torque and a high-speed rotation.

Description

Geared in-wheel motor {GEARED INWHEEL MOTOR}

The present invention relates to a geared in-wheel motor.

In-wheel motors are used in moving means that use electricity as a power source.

The in-wheel motor outputs power from a motor assembly located inside a rim.

The motor assembly includes a stator and a rotor. The power generated from the motor assembly is transmitted directly to the wheel of the in-wheel motor without passing through any other power transmission device.

The wheel wound around the rim of an in-wheel motor rotates using electricity as a power source.

As described above, the in-wheel motor has a relatively simple structure since it does not require a complicated driving device or a power transmission device, unlike conventional moving means.

As a result, the in-wheel motor enables weight reduction of the moving means and has the advantage of reducing energy loss generated during power transmission.

In-wheel motors include tires, rims, motor assemblies, and shafts.

Briefly, the tire is wrapped around the rim and joined. The motor assembly includes a stator and a rotor, and is provided inside the rim. The shaft is connected through the center of the stator.

The stator of the in-wheel motor receives power through an externally connected power supply lead. When power is supplied to the stator, the rotor rotates around the stator.

Meanwhile, since the rotor is connected to the rim, when the rotor rotates, the rim rotates, and the tire coupled to the outer ring of the rim also rotates.

In this way, in the in-wheel motor, the shaft and stator are fixed, and the rotor, rim, and tire rotate.

Geared in-wheel motor refers to a type in which a reduction gear and a clutch are built-in.

A typical geared in-wheel motor includes a tire, a rim, a motor assembly consisting of a stator and a rotor, a gear assembly, and a shaft.

However, in the case of various means of movement using a geared in-wheel motor, different types of output are required when driving on flat ground and when climbing a hill. For example, high torque output is required when climbing a hill, and high-speed rotation is required when driving on flat ground.

As a solution to this problem, in the past, an expensive inverter element was used to produce high torque output when climbing a hill and to enable high-speed rotation when driving on flat ground.

However, there is a disadvantage in that the product price is increased due to the use of an expensive inverter element, the occurrence rate of failure is high due to the addition of electronic components, and there is difficulty in replacement and maintenance in case of failure.

Therefore, there is a need for a technical solution capable of adjusting the gear ratio required according to the driving environment while using a single gear assembly.

As a conventional prior art, Korean Laid-Open Patent Publication No. 10-2013-0133462 (hereinafter, Prior Document 1) discloses an in-wheel motor using a planetary gear. The conventional in-wheel motor disclosed in Prior Document 1 is configured to enable stable high-speed driving by using a two-gear power train using a planetary gear. However, in the case of Prior Document 1, a complicated configuration for motor control is required in that a gear ratio control method according to acceleration and deceleration is used, and maintenance of the in-wheel motor is difficult.

As another prior art of the related art, Korean Laid-Open Patent Publication No. 10-2013-0086732 (hereinafter, Prior Document 2) discloses a speed reducer for an in-wheel motor. The reducer of the conventional in-wheel motor disclosed in Prior Document 2 is configured such that a reducer including a planetary gear, a sun gear, and a ring gear surrounds the motor. However, in the case of the reducer of Prior Literature 2, it does not suggest a configuration capable of adjusting the gear ratio according to different driving environments, such as when driving on a flat ground or when climbing a hill.

Republic of Korea Patent Publication No. 10-2013-0133462

An object of the present invention is to provide a geared in-wheel motor capable of outputting high torque and high rotation according to a driving environment without using an expensive inverter element in a geared in-wheel motor using a single gear assembly.

It is an object of the present invention to provide a geared in-wheel motor capable of improving mobility performance by selectively adjusting high-speed rotation during flat driving and high torque output during hill climbing without using an expensive inverter element.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention that are not mentioned can be understood by the following description, and will be more clearly understood by examples of the present invention. In addition, it will be easily understood that the objects and advantages of the present invention can be realized by the means shown in the claims and combinations thereof.

According to an aspect of the present invention for achieving the above object, there is provided a geared in-wheel motor capable of outputting high torque and high rotation according to a driving environment without an expensive inverter element in a geared in-wheel motor using a single gear assembly.

A geared in-wheel motor according to an embodiment of the present invention includes a rim, a shaft, a motor assembly, a cover, and a gear assembly. In this case, the gear assembly includes a sun gear, a planetary gear, and a ring gear.

A gear assembly of a geared in-wheel motor according to an embodiment of the present invention includes a fixed shaft and a one-way clutch.

The fixed shaft axially connects each of the plurality of planetary gears to one surface of the carrier.

The one-way clutch is disposed between the fixed shaft and each of the plurality of planetary gears, and allows or regulates the rotation of the plurality of planetary gears according to the rotational direction of the sun gear rotating in conjunction with the rotation of the rotor. have.

Rim refers to a circular rigid member. The tire can be coupled by wrapping the outer ring of the rim. The shaft can be connected through the center of the rim.

The motor assembly includes a stator and a rotor.

The stator is connected to the shaft and can be powered by a lead wire. And the stator is connected and fixed to the shaft inside the rim. The stator is wrapped around the shaft and coupled, does not rotate with the shaft and can be fixed in position.

The rotor is arranged to surround the stator. In addition, a predetermined gap (referred to as an “air gap”) may be formed between the rotor and the stator.

When power is supplied to the stator, electromagnetic force is generated between the stator and the rotor, and the rotor rotates around the stator from the outside.

At this time, both the stator and the rotor may be located inside the rim.

The cover covers the open side of the rim and is joined. A number of electric and electronic components susceptible to moisture, such as a motor assembly, may be embedded inside the rim to which the cover is coupled. The cover is coupled by covering the open side of the rim, so that the inside of the rim is shielded from the outside to secure a waterproof structure.

The gear assembly is disposed inside the rim and may serve to slow the rotation of the rotor.

The gear assembly includes a sun gear, a plurality of planetary gears, and a ring gear.

The sun gear is fixed in the center of the rotor and can rotate with the rotor.

The plurality of planetary gears may be arranged to surround the sun gear. A plurality of planetary gears may be connected to a carrier located inside the rim.

The ring gear may be disposed on the circumference of the plurality of planetary gears.

The fixed shaft may pass through the centers of each of the plurality of planetary gears and may be fixed to one surface of the carrier. The one-way clutch may be inserted between a circumferential surface of the fixed shaft and a center hole of each of the plurality of planetary gears.

The one-way clutch includes a clutch housing inserted in the form of a circular tube between the fixed shaft and each of the plurality of planetary gears, and interposed between the clutch housing and the fixed shaft, so as to set each of the plurality of planetary gears in a set rotational direction. It includes a clutch drive that rotates only.

The one-way clutch rotates the plurality of planetary gears meshed with the sun gear when the sun gear rotates in the first rotational direction, and transmits the rotational force shifted in a gear ratio between the sun gear and the plurality of planetary gears to the ring gear. I can.

In addition, when the sun gear rotates in the second rotational direction, the one-way clutch may interrupt rotation of the plurality of planetary gears meshed with the sun gear to directly transmit the rotational force of the sun gear to the ring gear.

The one-way clutch further includes a fixed shaft support portion for contacting and supporting outer diameters of both ends of the fixed shaft inside the clutch housing.

The carrier is located on the opposite side of the sun gear with the plurality of planetary gears interposed therebetween, and is closely fixed to the inside of the rim in a disk shape, and the shaft may be connected through the center.

The sun gear is fastened and fixed to the center of the rotor, and includes a fixing plate rotating together with the rotor, and a sun gear tooth protruding from the fixing plate to surround the shaft.

The fixing plate is in close contact with the circular seating groove formed inwardly from the center of the rotor, and may be fastened and fixed to the rotor by at least one fixing screw.

The rim has an accommodation space for accommodating the motor assembly and the gear assembly therein, and one side where the motor assembly is located is opened, and the cover may be coupled to the opened side.

Meanwhile, A geared in-wheel motor according to another embodiment of the present invention includes a rim, a shaft, a motor assembly, a cover, and a gear assembly, and the gear assembly includes a sun gear, a planetary gear, and a ring gear. In addition, a gear assembly of a geared in-wheel motor according to an embodiment of the present invention includes a fixed shaft and a one-way clutch. And the ring gear may be formed in an integral structure with the rim.

The rim has an accommodation space for accommodating the motor assembly and the gear assembly therein, and one side where the motor assembly is located is opened, and the cover may be coupled to the opened side.

In addition, the rim includes an annular rim body on which the tire is mounted, and a side plate disposed opposite the cover to which the cover is coupled from the rim body and formed facing the cover to receive the gear assembly.

The cover includes a disk-shaped cover body that covers and is coupled to an open surface of the rim body.

The ring gear is integrally formed with the rim so as to protrude in a direction in which the diameter is reduced through the inner surface of the rim body, and the ring gear body is integrally formed with the rim so as to be formed in a circumferential direction through the inner diameter of the ring gear body. It includes a ring gear tooth formed.

The rotor, the sun gear is fastened and fixed to the center, a disk having a plurality of through holes, the outer body protruding from the edge of the disk in a direction surrounding the stator and having at least one blade, the center of the disk And a core portion protruding to surround the shaft through which the shaft is coupled through and having at least one blade, and a magnet disposed around the stator with a predetermined gap therebetween.

The geared in-wheel motor according to embodiments of the present invention may further include at least one Hall sensor substrate positioned adjacent to the motor assembly.

According to the present invention, in a geared in-wheel motor using a single gear assembly, there is an advantage of enabling high torque and high rotation output according to a driving environment without using an expensive inverter element.

For example, without using an expensive inverter element for a geared in-wheel motor, mobility performance can be improved by selectively adjusting high-speed rotation when driving on level ground and high torque output when climbing a hill.

In addition, according to the present invention, by applying a one-way driving type clutch to the planetary gear, there is an advantage that outputs can be performed at different gear ratios according to the rotation direction of the motor assembly.

For example, when the motor assembly rotates in a forward direction (eg, clockwise, etc.), high-speed rotation output can be generated by a direct drive method, which has an advantage of being effective for driving on a flat ground.

Conversely, when the motor assembly rotates in the reverse direction (eg, counterclockwise, etc.), high torque output can be generated in a geared manner using the rotation of the planetary gear, which is effective for hill climbing.

In addition, according to the present invention, since the mode can be mechanically switched by selecting one of a geared mode and a direct drive mode according to a driving condition, there is an advantage of superior price competitiveness compared to the case of using an expensive electronic inverter device. In addition, the use of mechanical parts other than electronic devices has the advantage of reducing the incidence of failure, easy maintenance, and improved durability.

In addition to the above-described effects, specific effects of the present invention will be described together with explanation of specific details for carrying out the present invention.

1 is a schematic cross-sectional view of a geared in-wheel motor according to an embodiment of the present invention.
2 is an exploded perspective view schematically showing a geared in-wheel motor according to an embodiment of the present invention.
3 is a schematic perspective view of a gear assembly in a geared in-wheel motor according to an embodiment of the present invention.
4 is a view showing a detailed cross-sectional structure of a one-way clutch by enlarging the “A” cross-sectional area of FIG. 1;
5 is a view illustrating a one-way clutch operation of a geared in-wheel motor according to an embodiment of the present invention.
6 is an exemplary view of the operation of a high torque output mode (a) and a high rotation output mode (b) of a gear assembly of a geared in-wheel motor according to an embodiment of the present invention.
7 and 8 are perspective views showing exemplary shapes of a rim and a cover in a geared in-wheel motor according to another embodiment of the present invention.
9 is a view showing an exemplary shape of a rotor constituting a motor assembly of a geared in-wheel motor according to an embodiment of the present invention.

The above-described objects, features, and advantages will be described later in detail with reference to the accompanying drawings, and accordingly, a person of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar elements.

Although the first, second, and the like are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are only used to distinguish one component from another component, and unless otherwise stated, the first component may be the second component.

Throughout the specification, unless otherwise specified, each component may be singular or plural.

Hereinafter, the "top (or bottom)" of the component or the "top (or bottom)" of the component means that an arbitrary component is arranged in contact with the top (or bottom) of the component. In addition, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

In addition, when a component is described as being "connected", "coupled" or "connected" to another component, the components may be directly connected or connected to each other, but other components are "interposed" between each component. It is to be understood that "or, each component may be "connected", "coupled" or "connected" through other components.

Singular expressions used in the present specification include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various elements or various steps described in the specification, and some of the elements or some steps It may not be included, or it should be interpreted that it may further include additional components or steps.

In addition, a singular expression used in the present specification includes a plurality of expressions unless the context clearly indicates otherwise. In the present application, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various elements or various steps described in the specification, and some of the elements or some steps It may not be included, or it should be interpreted that it may further include additional components or steps.

Throughout the specification, when referred to as "A and/or B", it means A, B or A and B, unless otherwise specified, and when referred to as "C to D", it means that a special opposite description is Unless there is one, it means that it is C or more and D or less.

Overall structure of geared in-wheel motor

1 is a schematic cross-sectional view of a geared in-wheel motor according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view schematically showing a geared in-wheel motor according to an embodiment of the present invention.

The geared in-wheel motor 1000 according to an embodiment of the present invention is capable of high torque and high-speed rotation output according to a driving environment without an expensive inverter element in the geared in-wheel motor 1000 using a single gear assembly 700. There are features. For example, it means that high-speed rotation of the geared in-wheel motor 1000 is possible when driving on level ground, and high torque output of the geared in-wheel motor is possible when climbing a hill.

Hereinafter, an overall structure of the geared in-wheel motor 1000 according to a preferred embodiment of the present invention will be described.

1 and 2, the geared in-wheel motor 1000 includes a shaft 100, a rim 200, a motor assembly 300, a cover 410, and a gear assembly 700. The gear assembly 700 includes a sun gear 710, a planetary gear 730, and a ring gear 230. In addition, the gear assembly 700 further includes a fixed shaft 731 and a one-way clutch 740.

In addition, the geared in-wheel motor 1000 according to an embodiment of the present invention includes a Hall sensor substrate 600 (see FIG. 2), first, second, and third bearings 510, 520, and 540, and an O-ring 530 (see FIG. 2). It includes more.

Hereinafter, detailed components included in the geared in-wheel motor 1000 will be described in detail.

The rim 200 is a circular rigid member forming a wheel. In addition, the tire 800 may be coupled by wrapping the outer ring of the rim 200.

A first tire separation prevention jaw 220 (refer to FIG. 7) may be provided on the outer ring of the rim 200 to maintain the mounted state of the tire 800. The second tire separation preventing jaw 420 (see FIG. 8) may be provided on the cover 410 coupled to the open portion of the rim 200.

A hollow (hereinafter, referred to as an accommodation space) having a predetermined size is provided inside the rim 200. A plurality of electric and electronic components (eg, a hall sensor) including the shaft 100, the motor assembly 300, and the gear assembly 700 may be embedded through the accommodation space of the rim 200.

One side of the rim 200 is open. A number of components including the shaft 100, the motor assembly 300, and the gear assembly 700 are embedded through the open surface of the rim 200.

The cover 410 is covered with an open surface of the rim 200 and is coupled. According to this structure, the cover 410 seals the receiving space of the rim 200 from the outside.

The motor assembly 300 is embedded in the receiving space of the rim 200 and is coupled to surround the shaft 100.

Specifically, the motor assembly 300 is coupled between the shaft 100 and the rim 200 and includes a stator 310 and a rotor 330.

The stator 310 is connected to the shaft 100 and receives power from the outside by a power supply lead. For example, the lead wire for power supply may be configured to supply power to the stator 310 by being connected to the inside of the rim 200 through the hollow of the shaft 100.

In addition, the stator 310 is disposed in a shape surrounding the shaft 110 in the rim 200. The stator 310 surrounds the outer diameter of the shaft 110 by a fixed body 350 provided on the inside and may be firmly fixedly coupled to the shaft 110.

The rotor 330 is disposed to surround the stator 310 with a predetermined gap therebetween. Specifically, the rotor 330 includes a plurality of magnets 331 surrounding the stator 310 with an air gap therebetween.

In addition, the rotor 330 may further have a cylindrical structure including a core portion 335 surrounding the shaft 100 so as to maintain the installation distance of the plurality of magnets 331 and fix the installation positions thereof. However, the cylindrical structure is not limited to the illustrated shape, and can be changed into various shapes that are obvious to a person skilled in the art.

The motor assembly 300 is supplied with power to the stator 310 and rotates the rotor 330 around the stator 310 by using the electromagnetic force generated between the stator 310 and the rotor 330. It is configured to be.

When the rotor 330 rotates, the rim 200 rotates in conjunction with the rotation of the rotor 330. Subsequently, when the rim 200 rotates, the tire 800 mounted through the outer ring of the rim 200 rotates around the shaft 100.

The gear assembly 700 is disposed inside the rim 200 and serves to convert the rotational speed of the rotor 330 into a set gear ratio.

The gear assembly 700 includes a sun gear 710 and a plurality of planetary gears 730. In addition, the gear assembly 700 further includes a ring gear 230 disposed on the circumference of the plurality of planetary gears 730 and connected to the plurality of planetary gears 730.

The sun gear 710 is fixed to the center of the rotor 3300. And the planetary gear 730 is positioned surrounding the sun gear 710. The ring gear 230 is a position surrounding a plurality of planetary gears. It can be provided in.

Specifically, the sun gear 710 includes a sun gear tooth 711 and a fixing plate 713.

The fixing plate 713 is fastened and fixed to the center of the rotor 300. In addition, the fixing plate 713 may rotate together with the rotor 330 at the same speed as the rotor 330.

The sun gear tooth 711 has a shape protruding from the center of the fixing plate 713 toward the inner space of the plurality of planetary gears 730, and has a structure capable of connecting gears with the plurality of planetary gears 730.

In addition, the sun gear teeth 711 may be disposed to surround the shaft 100.

The fixing plate 713 is in close contact and fixed to a circular seating groove 339 formed inwardly from the center of the rotor 330. For example, the fixing plate 713 is fastened and fixed to the rotor 330 by at least one fixing screw 715, and the rotor 330 and the fixing plate 713 may rotate at the same speed.

Meanwhile, the geared assembly 700 further includes a carrier 750. The carrier 750 is inserted into the receiving space between the sun gear 711 and the inner surface of the rim 200 in the form of a disk.

Each of the plurality of planetary gears 730 may be axially connected by a planetary gear fixing shaft 731 through one surface of the carrier 750 to be rotatably mounted. Accordingly, the plurality of wired gears 730 which are gear connected to and rotated to the sun gear 710 rotate at a preset gear ratio and rotate the ring gear 230, and then the rotational force is transmitted to the rim 200.

In addition, the geared assembly 700 according to an embodiment of the present invention includes a fixed shaft 731 and a one-way clutch 740.

The fixed shaft 731 refers to a member that axially connects each of the plurality of planetary gears 730 to one surface of the carrier 750.

The one-way clutch 740 is formed of a plurality of planetary gears 730 meshed with the sun gear 710 according to the rotation direction of the sun gear 710 that rotates together with the rotor 330 when the rotor 330 rotates. Rotation can be allowed or regulated.

To this end, the one-way clutch 740 is disposed between the fixed shaft 731 and each of the plurality of planetary gears 730.

Specifically, when the sun gear 710 rotates in the first rotation direction (for example, counterclockwise, see FIG. 6A), the one-way clutch 740 is The planetary gear 730 is rotated. Accordingly, the rotational force shifted to the set gear ratio between the sun gear 710 and the plurality of planetary gears 730 may be transmitted to the ring gear 230. Accordingly, when a high torque output is required such as hill driving, smooth operation of the in-wheel motor (ie, geared mode driving) is possible.

Conversely, the one-way clutch 740 is a plurality of planetary gears meshed with the sun gear 710 when the sun gear 710 rotates in the second rotation direction (eg, clockwise, see FIG. 6(b)). Rotation of 730 is not allowed and rotation is regulated. Accordingly, the rotational force of the sun gear 710 may be directly transmitted to the ring gear 230. Accordingly, direct mode driving required for the in-wheel motor is possible when high-speed rotation is required while driving on flat ground.

In this way, the one-way clutch 740 rotates the plurality of planetary gears 730 only when the sun gear 710 rotates in the setting direction (eg, counterclockwise, etc.), and the sun gear 710 rotates in the opposite direction (eg, counterclockwise). : Clockwise, etc.) When rotating, the rotation of the plurality of planetary gears 730 is regulated. As a result, the geared in-wheel motor 1000 to which the single geared assembly 700 is applied can be rotated at high torque or at high speed as necessary.

Meanwhile, the rim 200 further includes a side plate 210 on the opposite side to which the cover 410 is coupled.

The side plate 210 is made of an integral structure with the rim 200 to seal the inner receiving space of the rim 200.

In addition, the side plate 210 is disposed facing the gear assembly 700, in particular, a carrier 750 on which a plurality of planetary gears 730 are mounted.

Meanwhile, the geared in-wheel motor 1000 according to an embodiment of the present invention includes at least one Hall sensor substrate 600.

The Hall sensor substrate 600 may be positioned adjacent to the motor assembly 300. More specifically, it may be located between the motor assembly 300 and the cover 410.

The Hall sensor substrate 600 may include a plurality of Hall sensors (eg, two Hall sensors, etc.). With this configuration, the Hall sensor substrate 600 can stably and accurately measure the magnetic force of the motor assembly 300.

The Hall sensor substrate 600 may further include a separate substrate insulator, and the Hall sensor substrate 600 is rigidly fixed using a substrate insulator and can maintain an initial installation position. Accordingly, the magnetic force of the motor assembly 300 can be stably measured.

Meanwhile, the geared in-wheel motor 1000 includes a plurality of bearings, that is, first, second, and third bearings 510, 520, and 540.

The first bearing 510 is provided between the cover 410 and the shaft 100 to reduce rotational friction therebetween. The second and third bearings 520 and 540 are provided between the motor assembly 300 and the shaft 100 and between the rim 200 and the shaft 100 to reduce rotational friction therebetween. In addition, a bearing for reducing rotational friction may be further included between the non-rotating shaft 100 and a plurality of rotating components.

Meanwhile, the geared in-wheel motor 1000 according to an embodiment of the present invention includes at least one O-ring 530. For example, the O-ring 530 is provided at a connection portion between the shaft 110 and the motor assembly 300 to prevent external moisture or water from penetrating into the motor assembly 300.

In addition, the geared in-wheel motor 1000 may further include a plurality of insulators. For example, the stator 310 may include at least one insulator.

One-way clutch

3 is a schematic perspective view of a gear assembly in a geared in-wheel motor according to an embodiment of the present invention.

As shown, the sun gear 710 is disposed in the center, and a plurality of planetary gears 730 surround the sun gear 710 and are positioned so as to be gear-connected. In addition, the ring gear 230 is arranged to surround the plurality of planetary gears 730 in the circumferential direction, and is connected to the plurality of planetary gears 730.

The sun gear 710 is coupled with the rotor 330 (see FIG. 2) and rotates at the same speed. In addition, each of the plurality of planetary gears 730 is axially connected by a fixed shaft 731 to be rotatably mounted.

As configured as described above, when the sun gear 710 rotates, the plurality of wired gears 730 rotate at a set gear ratio and rotate the ring gear 230.

The fixed shaft 731 axially connects each of the plurality of planetary gears 730, and a one-way clutch 740 is provided between the fixed shaft 731 and each of the plurality of planetary gears 730.

The one-way clutch 740 serves to rotate or forcibly block rotation of the plurality of planetary gears 730 meshed with the sun gear 710 according to the rotation direction of the sun gear 710.

FIG. 4 is a diagram showing a detailed cross-sectional structure of a one-way clutch, and is an enlarged view of a cross-sectional area “A” of FIG. 1.

Referring to FIG. 4, the planetary gear 730 is axially connected to the fixed shaft 731 and rotatably coupled through one surface of the carrier 750.

The one-way clutch 740 is disposed between the fixed shaft 731 and the planetary gear 730.

The fixed shaft 731 passes through the center of the planetary gear 730 and is fixed to one surface of the carrier 750. In addition, the one-way clutch 740 may be inserted between the circumferential surface of the fixed shaft 731 and the center hole of the planetary gear 730.

Specifically, the one-way clutch 740 includes a clutch housing 741 inserted between the fixed shaft 731 and the planetary gear 730 in the form of a circular tube. In addition, a clutch driving unit 745 is provided between the clutch housing 741 and the fixed shaft 731.

The clutch drive unit 745 rotates the planetary gear 730 in only one set direction and blocks rotation in the opposite direction, and is not necessarily limited to the illustrated structure, and can be changed to a form that is obvious to a person skilled in the art. Do.

In addition, the one-way clutch 740 further includes a fixed shaft support 743. The fixed shaft support portions 743 may be disposed at both ends of the length of the one-way clutch 740, respectively, and contact and support the outer diameters of both ends of the fixed shaft 731 inside the clutch housing 741.

5 is a diagram illustrating a one-way clutch operation of a geared in-wheel motor according to an embodiment of the present invention.

In the one-way clutch 740 (refer to FIG. 4) according to the embodiment of the present invention, the clutch driving unit 745 is rotated in the rotational direction shown in FIG. 5(a) around the fixed shaft 731 (eg, counterclockwise, etc.). ), the rotation operation is intercepted and rotation is impossible.

On the contrary, the clutch drive unit 745 can be rotated in a rotational direction (eg, clockwise, etc.) shown in FIG. 5B around the fixed shaft 731.

However, the clutch driving form of the one-way clutch is not necessarily limited to the configuration shown in the cross-section shown in FIG. 5, and may be changed to a cross-sectional configuration of various types of clutch driving parts that are obvious to a person skilled in the art.

6 is an exemplary view of the operation of the high torque output mode (a) and the high rotation output mode (b) of the gear assembly.

Referring to Figure 6 (a), in the case of the gear assembly according to the embodiment of the present invention by the above-described one-way clutch 740 (see Figure 4), the sun gear 710 is in the first rotation direction (for example, counterclockwise). Direction, etc.), the plurality of planetary gears 730 rotate in engagement therewith.

As a result, the rotational force is shifted to a set gear ratio between the sun gear 710 and the plurality of planetary gears 730, and the rotational force converted to high torque output is transferred to the rim 200 (see FIG. 1) and the tire through the ring gear 230. (800, see Fig. 1) can be delivered.

Accordingly, the geared in-wheel motor 1000 (refer to FIG. 1) can be smoothly driven even when high torque output is required, such as hill driving.

In contrast, referring to (b) of FIG. 6, when the sun gear 710 rotates in the second rotation direction (eg, clockwise, etc.), a plurality of the sun gear 710 is performed by the aforementioned one-way clutch 740 (refer to FIG. 4). The rotation of the planetary gear 730 is blocked. As a result, the rotational force of the sun gear 710 may be directly transmitted to the ring gear 230.

Accordingly, the geared in-wheel motor 1000 (refer to FIG. 1) can be driven in a direct mode when high-speed rotation is required in a general driving environment such as flat-ground driving, thereby improving driving efficiency.

In this way, the geared in-wheel motor 1000 (see FIG. 1) to which a single geared assembly 700 (see FIG. 1) is applied has the advantage of being capable of driving at high torque or high rotation as needed depending on the driving environment.

Meanwhile, a detailed configuration of a rim, a cover, and a rotor among a geared in-wheel motor according to another embodiment of the present invention will be described with reference to FIGS. 7 to 9.

7 to 9 are schematic views illustrating a ring gear-integrated rim, a cover, and a rotor among a geared in-wheel motor according to an embodiment of the present invention.

According to the illustrated embodiment of the present invention, the rim 200 and the cover 410 may be made of a material that can be injected out of the existing aluminum material. In addition, the ring gear 230 may be manufactured as a separate component from the rim 200 and then assembled inside the rim 200 (see FIG. 3 ). However, the present invention is not limited thereto, and according to another embodiment of the present invention, it may be manufactured in an integrated structure with the rim 200 by injection together with the rim 200. This can reduce the number of parts and simplify the assembly process.

7 and 8, the rim 200 and the cover 410 may be made of the same or similar material, and may be injection-molded. In this case, the ring gear 230 may have an integral structure with the rim 200.

The rim 200 is an annular rim body 201 on which a tire is mounted, a side plate formed opposite the cover 410 to receive the gear assembly 700 and located on the opposite side of the rim body 201 to which the cover is coupled. Includes 210.

The side plate 210 includes a first tire separation bump 220. The first tire separation prevention jaw 220 has a structure that is larger than the rim body 201 and protrudes outward, and fixes one side of the tire 800 (refer to FIG. 1) mounted on the rim 200 to prevent separation. .

The cover 410 includes a disk-shaped cover body 411 that covers an open surface of the rim body 201 and is coupled.

The cover body 411 includes a second tire separation protrusion 420. The second tire separation bump 420 has a structure that protrudes outward so as to have a diameter corresponding to the first tire separation bump 220, and the other side of the tire 800 (refer to FIG. 1) mounted on the rim 200 Fix to prevent separation.

Meanwhile, a plurality of fastening grooves 204 in the circumferential direction may be provided in the connection end 203 protruding from the rim body 201 to the opposite side of the side plate 210. In addition, the cover body 411 may be provided with a plurality of fastening holes 414 corresponding to the plurality of fastening grooves 204. Accordingly, the rim 200 and the cover 410 may be provided in a structure capable of being fastened and separated using screws.

The ring gear 230 includes a ring gear body 231 and a ring gear tooth 233.

The ring gear body 231 is a portion protruding in a direction in which the diameter is reduced through the inner surface of the rim body 201. The ring gear tooth 233 is a portion formed in the circumferential direction through the inner diameter of the ring gear body 231 and is gear-connected to the planetary gear 730.

The ring gear body 231 is formed to have a predetermined width toward the opposite side of the side plate 210 from a position where the rim body 201 and the side plate 210 cross and abut.

Referring to FIG. 9, a rotor 330 according to another embodiment of the present invention may include a blade 340. Since the geared in-wheel motor according to another embodiment of the present invention may be made of a material in which the rim 200 and the cover 410 are injection-molded, heat dissipation characteristics may be deteriorated compared to conventional metal materials. The blade 240 may be formed inside or outside the rotor 330. The blade 240 may cause a forced flow of air when the rotor 330 rotates, thereby improving heat dissipation characteristics.

The rotor 330 includes a disk 333, an outer body 334, a core portion 335, and a magnet 331 (see FIG. 1). The disk 333 is fastened and fixed to the center of the sun gear 710 (see FIG. 2 ), and includes a plurality of through holes 332. For example, the plurality of through holes 332 may be circular arc-shaped holes disposed in the circumferential direction from the core portion 335 within the disk 333 at regular intervals from each other.

The outer body 334 protrudes from the edge of the disk 333 in a direction surrounding the stator 310 (see FIG. 1 ). The core portion 335 protrudes to surround the shaft 100 that is coupled through the center of the disk 333. The magnet 331 is disposed surrounding the stator 310 with the stator 310 and a predetermined gap (ie, an air gap) interposed therebetween (see FIG. 1 ).

A plurality of blades 340 may be provided. For example, the plurality of blades 340 includes a plurality of first blades 341 and a plurality of second blades 343.

The plurality of first blades 341 protrude outward at a predetermined height along the outer circumferential surface of the outer body 334 and are formed to be inclined. Further, the plurality of second blades 343 protrude outward at a predetermined height along the outer circumferential surface of the core portion 335 and are formed to be inclined.

For example, each of the plurality of first blades 341 and the plurality of second blades 343 may be spaced apart from each other at a predetermined interval. Furthermore, the plurality of second blades 343 may be formed to be inclined in a direction different from that of the plurality of first blades 341. As described above, the first and second blades 341 and 343 formed to be inclined in different directions complicate the air flow around the rotor 330, thereby improving cooling performance by air circulation.

As described above, according to the present invention, in a geared in-wheel motor using a single gear assembly, there is an advantage of enabling high torque and high rotation output according to a driving environment without using an expensive inverter element.

For example, without using an expensive inverter element for a geared in-wheel motor, mobility performance can be improved by selectively adjusting high-speed rotation when driving on level ground and high torque output when climbing a hill.

Furthermore, by applying the one-way driving clutch to the planetary gear, there is an advantage that outputs can be performed at different gear ratios according to the rotation direction of the motor assembly.

For example, when the motor assembly rotates in a forward direction (eg, clockwise, etc.), a high-speed rotation output may be generated by a direct drive method, which may be effective for driving on a flat ground. Conversely, when the motor assembly rotates in the reverse direction (eg, counterclockwise, etc.), a high torque output may be generated in a geared manner using the rotation of the planetary gear, which may be effective for hill climbing.

Furthermore, since the mode can be mechanically switched by selecting one of the geared mode and the direct drive mode according to the driving conditions, there is an advantage of superior price competitiveness compared to the case of using an expensive electronic inverter device. In addition, the use of mechanical parts other than electronic devices may reduce the incidence of failure, facilitate maintenance, and improve durability.

In addition, by manufacturing the ring gear together with the rim in an integral structure, the number of parts of the gear assembly can be reduced and the assembly process can be simplified, thereby helping to improve productivity.

In addition, by improving the heat dissipation characteristics of the motor assembly, the temperature of the in-wheel motor is prevented from rising rapidly during high torque operation, thereby maintaining performance and preventing failure.

As described above with reference to the drawings illustrated for the present invention, the present invention is not limited by the embodiments and drawings disclosed in the present specification, and various by a person skilled in the art within the scope of the technical idea of the present invention. It is obvious that transformations can be made. In addition, even if not explicitly described and described the effects of the configuration of the present invention while describing the embodiments of the present invention, it is natural that the predictable effects of the configuration should also be recognized.

100: shaft
200: rim
201: rim body
203: connection end
204: fastening groove
210: side plate
220: first tire separation bump
230: ring gear
231: ring gear body
233: ring gear tooth
300: motor assembly
310: stator
330: rotor
331: magnet
332: through hole
333: disc
334: outer body
335: core part
339: seating groove
341: first blade
343: second blade
350: fixed body
410: cover
411: cover body
414: fastening ball
510: first bearing
520: second bearing
530: O-ring
540: third bearing
600: Hall sensor board
700: gear assembly
710: sun gear
711: sun gear tooth
713: fixed plate
715: fixing screw
730: planetary gear
731: fixed shaft
740: one-way clutch
741: clutch housing
743: fixed shaft support
745: clutch drive
750: carrier
800: tire
1000: geared in-wheel motor

Claims (20)

A rim in which the tire wraps around the outer ring and is coupled;
A shaft connected through the center of the rim;
A motor assembly including a stator connected to the shaft inside the rim and a rotor disposed to surround the stator and rotated;
A cover coupled to seal the open portion of the rim; And
A sun gear fixed to the center of the rotor, a plurality of planetary gears connected to a carrier located inside the rim so as to surround the sun gear, and a ring gear surrounding the plurality of planetary gears. Including; a gear assembly that includes,
The gear assembly may include: a fixed shaft for axially connecting each of the plurality of planetary gears to one surface of the carrier; And
A one-way clutch disposed between the fixed shaft and each of the plurality of planetary gears to allow or regulate rotation of the plurality of planetary gears according to a rotational direction of the sun gear rotating in association with the rotation of the rotor;
Geared in-wheel motor comprising a.
The method of claim 1,
The fixed shaft,
Passing through the centers of each of the plurality of planetary gears and being fixed to one surface of the carrier,
The one-way clutch,
Characterized in that it is inserted between the circumferential surface of the fixed shaft and the center hole of each of the plurality of planetary gears
Geared in-wheel motor.
The method of claim 1,
The one-way clutch,
A clutch housing inserted in the shape of a circular tube between the fixed shaft and each of the plurality of planetary gears; And
A clutch driving unit interposed between the clutch housing and the fixed shaft to rotate each of the plurality of planetary gears only in a set rotation direction;
Geared in-wheel motor comprising a.
The method of claim 3,
The one-way clutch,
When the sun gear rotates in the first rotational direction, the plurality of planetary gears meshed with the sun gear are rotated to transmit a rotational force shifted to a gear ratio between the sun gear and the plurality of planetary gears to the ring gear,
When the sun gear is rotated in the second rotational direction, rotation of the plurality of planetary gears meshed with the sun gear is intercepted to directly transmit the rotational force of the sun gear to the ring gear.
Geared in-wheel motor.
The method of claim 3,
The one-way clutch,
A fixed shaft support part contacting and supporting outer diameters of both ends of the fixed shaft inside the clutch housing;
Geared in-wheel motor further comprising a.
The method of claim 2,
The carrier is located on the opposite side of the sun gear with the plurality of planetary gears interposed therebetween, and is closely fixed to the inside of the rim in a disk shape, and the shaft is connected through the center.
Geared in-wheel motor.
The method of claim 1,
The sun gear,
A fixing plate fastened and fixed to the center of the rotor and rotated with the rotor; And
A sun gear tooth protruding from the fixing plate to surround the shaft;
Geared in-wheel motor comprising a.
The method of claim 7,
The fixing plate,
Characterized in that it is in close contact with the circular seating groove formed inwardly from the center of the rotor, and is fastened and fixed to the rotor by at least one fixing screw.
Geared in-wheel motor.
The method of claim 1,
The rim is,
It has an accommodation space for accommodating the motor assembly and the gear assembly therein,
One side where the motor assembly is located is opened, and the cover is coupled to the opened side.
Geared in-wheel motor.
A rim in which the tire wraps around the outer ring and is coupled;
A shaft connected through the center of the rim;
A motor assembly including a stator connected to the shaft inside the rim and a rotor disposed to surround the stator and rotated;
A cover coupled to seal the open portion of the rim; And
A sun gear fixed to the center of the rotor, a plurality of planetary gears connected to a carrier located inside the rim so as to surround the sun gear, and a ring gear surrounding the plurality of planetary gears. Including; a gear assembly that includes,
The gear assembly includes a fixed shaft for axially connecting each of the plurality of planetary gears to one surface of the carrier,
A one-way clutch that is disposed between the fixed shaft and each of the plurality of planetary gears and allows or regulates the rotation of the plurality of planetary gears according to the rotational direction of the sun gear rotating in conjunction with the rotation of the rotor. Including, wherein the ring gear is formed in an integral structure with the rim
Geared in-wheel motor.
The method of claim 10,
The rim has an accommodation space for accommodating the motor assembly and the gear assembly therein, and one side where the motor assembly is located is opened, and the cover is coupled to the opened side,
The rim is,
An annular rim body on which the tire is mounted; And
Including; a side plate disposed on the opposite side of the rim body to which the cover is coupled and formed to face the cover to receive the gear assembly,
The cover,
A disk-shaped cover body that covers the open surface of the rim body and is coupled;
Geared in-wheel motor comprising a.
The method of claim 11,
The ring gear,
A ring gear body integrally formed with the rim so as to protrude in a direction in which the diameter is reduced through the inner surface of the rim body; And
A ring gear tooth integrally formed with the rim so as to be formed in a circumferential direction through an inner diameter of the ring gear body;
Geared in-wheel motor comprising a.
The method of claim 10,
The rotor is,
A disk fastening and fixing the sun gear to the center and having a plurality of through holes;
An outer body protruding from an edge of the disk in a direction surrounding the stator and having at least one blade;
A core portion protruding to surround the shaft coupled through the center of the disk and including at least one blade; And
A magnet disposed around the stator with a predetermined gap therebetween;
Geared in-wheel motor comprising a.
The method of claim 10,
The fixed shaft,
Passing through the centers of each of the plurality of planetary gears and being fixed to one surface of the carrier,
The one-way clutch,
It is inserted between the circumferential surface of the fixed shaft and the center hole of each of the plurality of planetary gears,
The one-way clutch,
A clutch housing inserted in the shape of a circular tube between the fixed shaft and each of the plurality of planetary gears; And
A clutch driving unit interposed between the clutch housing and the fixed shaft to rotate each of the plurality of planetary gears only in a set rotation direction;
Geared in-wheel motor comprising a.
The method of claim 14,
The one-way clutch,
When the sun gear rotates in the first rotational direction, the plurality of planetary gears meshed with the sun gear are rotated to transmit a rotational force shifted to a gear ratio between the sun gear and the plurality of planetary gears to the ring gear,
When the sun gear is rotated in the second rotational direction, rotation of the plurality of planetary gears meshed with the sun gear is intercepted to directly transmit the rotational force of the sun gear to the ring gear.
Geared in-wheel motor.
The method of claim 14,
The one-way clutch,
A fixed shaft support part contacting and supporting outer diameters of both ends of the fixed shaft inside the clutch housing;
Geared in-wheel motor further comprising a.
The method of claim 14,
The carrier is located on the opposite side of the sun gear with the plurality of planetary gears interposed therebetween, and is closely fixed to the inside of the rim in a disk shape, and the shaft is connected through the center.
Geared in-wheel motor.
The method of claim 10,
The sun gear,
A fixing plate fastened and fixed to the center of the rotor and rotated with the rotor; And
A sun gear tooth protruding from the fixing plate to surround the shaft;
Geared in-wheel motor comprising a.
The method of claim 18,
The fixing plate,
Characterized in that it is in close contact with the circular seating groove formed inwardly from the center of the rotor, and is fastened and fixed to the rotor by at least one fixing screw.
Geared in-wheel motor.
The method of claim 10,
At least one Hall sensor substrate positioned adjacent to the motor assembly; further comprising,
The geared in-wheel motor, wherein the at least one Hall sensor substrate includes a plurality of Hall sensors.

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