WO2016056873A1

WO2016056873A1 - Reducer comprising multiple gear assemblies

Info

Publication number: WO2016056873A1
Application number: PCT/KR2015/010711
Authority: WO
Inventors: 김정수
Original assignee: 주성오토테크 주식회사
Priority date: 2014-10-10
Filing date: 2015-10-12
Publication date: 2016-04-14
Also published as: KR20160042497A

Abstract

Disclosed is a reducer comprising multiple gear assemblies. The reducer comprising multiple gear assemblies comprises: a case; multiple gear assemblies installed inside the case; and a rotating shaft coupled to the multiple gear assemblies, wherein the multiple gear assemblies are eccentrically coupled to mutually different locations when coupling with the rotating shaft.

Description

Reducer with multiple gear assemblies

The present invention relates to a speed reducer comprising a plurality of gear assemblies.

The reducer is a device for deceleration using gears, and is used in a variety of emergency four wheel systems, in-wheel systems, bicycle gears, etc. to control speed or generate torque.

Generally, in-wheel motors are a technology used in electric vehicles that use electricity as a power source. Unlike in-wheel motors, the wheels are driven in rotation by power transmission through an engine-mission-drive shaft in a gasoline or diesel vehicle. It is a device that transmits power directly to a wheel by a motor disposed.

When the in-wheel motor is applied, driving and power transmission devices such as engines, transmissions, and differential gears can be omitted, thereby reducing the weight of the vehicle, as well as improving wheel performance and driving performance independently. There is an advantage to reduce the energy loss.

1 is a perspective view briefly illustrating a state in which a conventional in-wheel motor system is installed on a wheel, and FIG. 2 is an assembled cross-sectional view of FIG. 1.

Referring to the drawings, the in-wheel motor system is installed on the wheel 10 from the inside of the vehicle to the outside of the vehicle. More specifically, the axle 20 is installed in the center of the wheel 10 and rotates with the wheel 10, the reducer 30 for reducing the transmission force of the in-wheel motor 40 to the axle 20, and An in-wheel motor 40 connected to the reduction gear 30 and a disc brake 60 for pressing the disc 50 provided between the wheel 10 and the axle 20 to generate a braking force.

This in-wheel motor system has to be provided with the reducer 30 to increase the torque of the in-wheel motor 40 and the in-wheel motor system because the brake system, that is, the disc 50 and the disc brake 60 must be mounted in the wheel 10 When the fastener 10 is fastened to the wheel 10, there is a problem in vehicle runningability due to inefficiency of space utilization and an increase in unsprung mass.

In particular, when the in-wheel motor system is mounted on the wheel 10, the disc 50, the disc brake 60, and the reducer 30 are located in the wheel 10, but the in-wheel motor 40 is limited due to the limitation of the space in the wheel 10. ) Is protruded to the outside of the wheel 10, that is, the inside of the vehicle, there is a problem that the in-wheel motor 40 is damaged by an impact by an external object.

The present invention is to solve the above problems, it is possible to rotate with a small force, but the power of the wheel is increased, so there is no problem in rotating the wheel of the vehicle even when using a small motor connected, thereby Provides a reducer that includes a plurality of gear assemblies that allow the wheel to rotate with great force in the in-wheel motor system and reduce costs in the design and manufacture of the in-wheel motor system as the use of small motors is possible. Its purpose is to.

The present invention provides a speed reducer including a plurality of gear assemblies, comprising: a case; A plurality of gear assemblies installed in the case; And a rotation shaft coupled to the plurality of gear assemblies, wherein the plurality of gear assemblies are eccentrically coupled to different positions when combined with the rotation shaft. to provide.

The plurality of gear assemblies may include a first gear, a first gear, a second gear engaged with the first gear, and a first eccentric cam coupled with the second gear and coupled with the second gear. 1 gear assembly; A second gear assembly coupled to the case and including a third gear, a fourth gear engaged with the third gear, and a second eccentric cam coupled with the fourth gear and coupled with the fourth gear; And a third assembly including a fifth gear, a sixth gear engaged with the fifth gear, a third eccentric cam coupled with the sixth gear and coupled with the sixth gear, The first eccentric cam, the second eccentric cam and the third eccentric cam are coupled to the rotary shaft, wherein the first eccentric cam, the second eccentric cam and the third eccentric cam are coupled to the rotary shaft. The locations may differ.

The reducer including a plurality of gear assemblies according to the present invention can be rotated with a small force, but the wheel rotating force is increased, so that the wheel of the vehicle can be rotated even when a small motor is connected, and the in-wheel motor of the vehicle In this system, the wheel can be rotated with great force, and the use of a small motor can reduce the cost of designing and manufacturing the in-wheel motor system.

1 is a perspective view briefly showing a state in which a conventional in-wheel motor system is installed on a wheel.

FIG. 2 is an assembled cross-sectional view of FIG. 1.

Figure 3 is an exploded perspective view showing the configuration of the gear assembly according to an embodiment of the present invention.

4 is a cross-sectional view of the combination of FIG.

FIG. 5 illustrates a state in which the gear assembly shown in FIG. 3 is accommodated in a case and eccentric.

Hereinafter, a reducer according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements. In the accompanying drawings, the dimensions of the structures are shown in an enlarged scale than actual for clarity of the invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Figure 3 is an exploded perspective view showing the configuration of the reducer according to an embodiment of the present invention.

Referring to FIG. 3, a speed reducer according to an embodiment of the present invention may include a case 500, a first gear assembly 100, a second gear assembly 200, a third gear assembly 300, and a rotation shaft 400. It includes.

The case 500 accommodates the first gear assembly 100, the second gear assembly 200, and the third gear assembly 300. To this end, the case 500 has a receiving space 510. For example, the case 500 may be a hollow cylindrical shape. The inside of the cylindrical hollow may form a receiving space 510.

The first gear assembly 100 includes a first gear 110, a second gear 120, and a first eccentric cam 130.

The first gear 110 receives the second gear 120 and is configured to rotate in engagement with the second gear 120. To this end, the first gear 110 may have a structure that can accommodate the second gear 120. For example, the first gear 110 may have a cylindrical shape with one surface open. In this case, the first gear 110 may include an accommodation space 111, a first cam receiving portion 112, and a first through hole 113.

The accommodation space 111 may be formed by being indented from the cylindrical open surface of the first gear 110. The indented depth may be a depth that can accommodate the second gear 120. Gears 110a may be formed in the inner wall of the accommodation space 111 along the circumferential direction of the first gear 110.

The first cam accommodation portion 112 may be formed to be indented from the accommodation space 111. For example, the first cam receiving portion 112 may be indented from a surface perpendicular to the inner wall of the accommodation space 111 in which the gear 110a is formed. The inner diameter of the first cam accommodating part 112 is larger than the outer diameter of the second cam accommodating part 121 of the second gear 120 to be described later, and the inner diameter of the accommodating space 111 is the entire diameter of the second gear 120. Larger than diameter

The first through hole 113 is formed to penetrate through the first cam receiving portion 112. The rotary shaft 400 may be inserted into the first gear 110 through the first through hole 113.

The second gear 120 is meshed with the first gear 110. For this purpose, the second gear 120 is accommodated in the first gear 110. For example, the second gear 120 may have a circular plate shape and may have a diameter that can be inserted into the accommodation space 111 of the first gear 110. In this case, the second gear 120 may include a second cam receiving portion 121 and a second through hole 122.

The second cam receiving portion 121 is a portion that can accommodate the first eccentric cam 130. The second cam accommodation portion 121 may protrude from one surface of the second gear 120. For example, the second cam accommodation portion 121 may protrude in a circular ring shape.

The second through hole 122 is formed to penetrate the second cam receiving portion 121. The rotary shaft 400 may be inserted into the second gear 120 through the second through hole 122.

The first eccentric cam 130 is coupled to the second gear 120 so that the second gear 120 is eccentrically rotated. For example, the first eccentric cam 130 may include a circular plate portion 131 and a shaft coupling hole 132 formed in the plate portion 131. The shaft coupling hole 132 is eccentrically positioned to one side from the center of the plate portion 131. The plate portion 131 of the first eccentric cam 130 has a size that can be inserted into the second cam accommodation portion 121.

Here, the assembled state of the first gear 110, the second gear 120, the eccentric cam 130 will be described.

The first eccentric cam 130 is coupled to the second cam receiving portion 121. At this time, the shaft coupling hole 132 is exposed through the second through hole 122 and the plate portion 131 is engaged with the inner surface of the second cam receiving portion 121 is fixed without flow.

In this state, the second gear 120 and the first eccentric cam 130 are accommodated inside the first gear 110. That is, the second gear 120 is inserted into the accommodation space 111 of the first gear 110 in a state where the first eccentric cam 130 is coupled to the second cam accommodation portion 121. At this time, the plate portion 131 is located in the receiving space 111, the second cam receiving portion 121 is inserted into the first cam receiving portion 112, the first eccentric cam 130 is also the second cam receiving portion 121 Is accommodated in). The rotating shaft 400 is fixed to the shaft coupling hole 132 of the first eccentric cam 130. This assembly is well illustrated in FIG. 5.

Looking at the state in which the first gear 110 and the second gear 120 is rotated in the assembled state as shown in Figure 4, the rotary shaft 400 connected to the first eccentric cam 130 is rotated, thereby The second gear 120 coupled with the eccentric cam 130 and the first eccentric cam 130 is rotated. Rotation of the rotary shaft 400 may be rotated by the connection of a drive motor (not shown).

When the second gear 120 is rotated, the second gear 120 is rotated in the receiving space 111 of the first gear 110. At this time, since the rotation shaft 400 is eccentrically positioned by the first eccentric cam 130, the second gear 120 is eccentrically rotated. As the second gear 120 rotates eccentrically, the second gear 120 meshes with the gear 110a in the accommodation space 111 of the first gear 110, whereby the first gear 110 rotates. .

The second gear assembly 200 includes a third gear 210, a fourth gear 220, and a second eccentric cam 230.

The third gear 210 may include an accommodation space 211, a third cam receiving portion 212, and a third through hole 213. Since the third gear 210 is the same as or similar to the structure of the first gear 110, it will be replaced with the description of the first gear 110 and a detailed description thereof will be omitted.

The fourth gear 220 may include a fourth cam receiving portion 221 and a fourth through hole 222. Since the fourth gear 220 is the same as or similar to the structure of the second gear 120, it will be replaced with the description of the second gear 120 and a detailed description thereof will be omitted.

The second eccentric cam 230 may include a circular plate portion 231 and a shaft coupling hole 232 formed in the plate portion 231. The second eccentric cam 230 has a structure of the first eccentric cam 130 except that the position of the shaft coupling hole 232 is different from the position of the shaft coupling hole 132 of the first eccentric cam 130. Since it is the same or similar, the description of the first eccentric cam 130 will be replaced with the detailed description thereof.

The third gear assembly 300 includes a fifth gear 310, a sixth gear 320, and a third eccentric cam 330.

The fifth gear 310 may include an accommodation space 311, a fifth cam accommodation portion 312, and a fifth through hole 313. Since the fifth gear 310 is the same as or similar to the structure of the first gear 110, it will be replaced with the description of the first gear 110 and a detailed description thereof will be omitted.

The sixth gear 320 may include a sixth cam accommodation portion 321 and a sixth through hole 322. Since the sixth gear 320 is the same as or similar to the structure of the second gear 120, the description of the second gear 120 will be replaced with the detailed description thereof.

The third eccentric cam 330 may include a circular plate portion 331 and a shaft coupling hole 332 formed in the plate portion 331. The third eccentric cam 330 is the position of the shaft coupling hole 332 of the shaft coupling hole 131 of the first eccentric cam 130 and the shaft coupling hole 231 of the second eccentric cam 230. Except for being different from the structure of the first eccentric cam 130 is the same or similar, so the description of the first eccentric cam 130 will be replaced with a detailed description thereof will be omitted.

The rotary shaft 400 allows the first gear assembly 100, the second gear assembly 200, and the third gear assembly 300 to rotate. To this end, the rotary shaft 400 is coupled to the shaft coupling holes 132, 232, 332 of the first eccentric cam 130, the second eccentric cam 230, and the third eccentric cam 330, respectively. In this case, the shaft coupling holes 132, 232, and 332 of the

eccentric cams

130, 230, and 330 are formed at different positions, so that the second gear 120 and the fourth gear when combined with the rotary shaft 400. The gear 220 and the sixth gear 320 are different from each other in an eccentric position.

5 is a view for explaining a state in which the gear assemblies of the reducer are coupled to the rotary shaft according to an embodiment of the present invention.

Referring to FIG. 5, as described above, the eccentric positions of the second gear 120, the fourth gear 220, and the sixth gear 320 of each of the

gear assemblies

100, 200, and 300 are different from each other. . For example, as shown in FIG. 5, each of the second gear 120, the fourth gear 220, and the sixth gear 320 may be eccentric to form an angle of 120 degrees to each other. In this case, the first gear 110 meshes with the second gear 120, the third gear 210 meshes with the fourth gear 220, and the fifth gear 310 meshes with the sixth gear 320. Can be rotated at different eccentric positions.

Each of the first gear 110, the third gear 210, and the fifth gear 310 rotated at different eccentric positions may include the second gear 120, the fourth gear 220, and the sixth gear ( The rotation speed is lowered because it rotates in a state where only a part is engaged without being completely engaged with 320). However, since the first gear assembly 100, the second gear assembly 200, and the third gear assembly 300 are arranged in multiple stages and rotate together with the rotary shaft 400, the reduction ratio is high and a large force is obtained compared to the rotation speed. Can be.

When the driving shaft of the driving motor is connected to the rotary shaft 400 in the state as shown in FIG. 5, and the driving motor is driven, the rotational force of the driving shaft can be reduced, and the reduced rotational force can be output.

The gear assembly according to the embodiment of the present invention is the second gear 120 when the first gear 110 is engaged with the first gear 110 while being rotated in an eccentricity state rather than being completely engaged with the first gear 110. Since the first gear 110 is rotated, the rotation speed of the first gear 110 is lowered. However, on the other hand, the reduction ratio is high, and great power can be obtained.

Therefore, when applied to the in-wheel system of the vehicle can be rotated with a small force, but the power of the wheel is increased, so there is no problem in rotating the wheel of the vehicle even when using a small motor connected.

The use of the gear assembly according to an embodiment of the present invention allows the wheel to rotate with great force in the in-wheel motor system of the vehicle, and enables the use of a small motor, thereby costing the design and manufacture of the in-wheel motor system. This has the advantage of being reduced.

The description of the presented embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention should not be limited to the embodiments set forth herein but should be construed in the broadest scope consistent with the principles and novel features set forth herein.

Gear assembly for the reducer of the present invention can be utilized in a variety of fields that require a large torque and a large reduction ratio, such as emergency wheels, bicycle gears, as well as in-wheel motor system is large industrial applicability.

Claims

A speed reducer including a plurality of gear assemblies,

case;

A plurality of gear assemblies installed in the case; And

It includes a rotary shaft coupled to the plurality of gear assemblies,

The gear assembly is characterized in that the eccentrically coupled to different positions when coupled with the rotary shaft,

Reducer comprising a plurality of gear assemblies.
The method of claim 1,

The plurality of gear assemblies,

A first gear assembly coupled to the case and including a first gear, a second gear engaged with the first gear, and a first eccentric cam coupled with the second gear and coupled with the second gear;

A second gear assembly coupled to the case and including a third gear, a fourth gear engaged with the third gear, and a second eccentric cam coupled with the fourth gear and coupled with the fourth gear; And

A third assembly including a fifth gear, a sixth gear engaged with the fifth gear, a third eccentric cam coupled with the sixth gear, and coupled with the sixth gear,

The first eccentric cam, the second eccentric cam and the third eccentric cam are coupled to the rotary shaft, wherein the first eccentric cam, the second eccentric cam and the third eccentric cam are coupled to the rotary shaft. Characterized in that the positions are different,

Reducer comprising a plurality of gear assemblies.