KR20140145347A - Planetary Gear Apparatus - Google Patents

Planetary Gear Apparatus Download PDF

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Publication number
KR20140145347A
KR20140145347A KR1020130067643A KR20130067643A KR20140145347A KR 20140145347 A KR20140145347 A KR 20140145347A KR 1020130067643 A KR1020130067643 A KR 1020130067643A KR 20130067643 A KR20130067643 A KR 20130067643A KR 20140145347 A KR20140145347 A KR 20140145347A
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KR
South Korea
Prior art keywords
bearing case
input
gear
output
shaft
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KR1020130067643A
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Korean (ko)
Inventor
고경민
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주식회사 만도
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Priority to KR1020130067643A priority Critical patent/KR20140145347A/en
Publication of KR20140145347A publication Critical patent/KR20140145347A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/2863—Arrangements for adjusting or for taking-up backlash
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/003—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion the gear-ratio being changed by inversion of torque direction
    • F16H3/005—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion the gear-ratio being changed by inversion of torque direction for gearings using gears having orbital motion

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Retarders (AREA)

Abstract

The present invention relates to a planetary gear device, and according to an embodiment of the present invention, even if the gear teeth of the planetary gears and the gear teeth of the sun gears are worn, the elastic members push the planetary gears toward the center of the carrier, The clearance between the sun gears is compensated to thereby prevent noise from being generated.

Figure P1020130067643

Description

[0001] Planetary Gear Apparatus [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gear device, and more particularly, to a planetary gear device that includes an input shaft, To a planetary gear device capable of preventing generation of noise by compensating for a clearance.

1 is a configuration diagram of an active front wheel barrel apparatus of a conventional automobile. 2 is a cross-sectional view schematically showing a gear ratio converting apparatus of an active front wheel steering apparatus of a conventional automobile.

1, an active front wheel steering apparatus of a conventional automobile includes a steering wheel 101, a steering shaft 103 connected to the steering wheel 101, a steering column 105 surrounding the steering shaft 103, An input angle sensor 107 formed at the lower end of the steering column 105, a gear ratio conversion device 109 formed below the input angle sensor 107, a first motor 111 for driving the gear ratio conversion device 109 A first motor position sensor 113 provided in the first motor 111, an output angle sensor 115 provided below the gear ratio converter 109, a vehicle speed sensor 117 for detecting the speed of the vehicle, A rack-and-pinion mechanism portion 121 formed below the gear ratio converter 109 for converting the rotational motion of the steering shaft 103 into a linear motion of the rack bar 119, An electronic control unit for receiving various signals from the second motor 123, the input angle sensor 107, the first motor position sensor 113 and the output angle sensor 115 a ctronic control unit (ECU) 125, and the like.

2, the conventional gear ratio conversion apparatus includes an input shaft 210, a first sun gear 220 formed at the lower end of the input shaft 210, a first sun gear 220 external to the first sun gear 220, A second planetary gear 280 connected to the first planetary gear 270 via a planetary gear shaft 275, a second planetary gear 280 coupled to the second planetary gear 280 and a second sun gear 230 An output shaft 240 connected to the second sun gear 230, a worm wheel 250 and a worm 260, and the like.

The operation principle of the active front wheel steering apparatus and the gear ratio conversion apparatus of the conventional automobile having such a configuration is as follows.

When the driver rotates the input shaft 210 as the steering wheel 101 is operated, the first sun gear 220 formed at the lower end of the input shaft 210 rotates in conjunction with the input shaft 210.

In this case, the first planetary gear 270, which is in contact with the first sun gear 220, rotates, and the second planetary gear train 270, which is connected to the first planetary gear 270 via the planetary gear shaft 275, The gear 280 is rotated.

The second sun gear 230 which is in contact with the second planetary gear 280 is rotated and the output shaft 240 formed by extending from the second sun gear 230 rotates, Pinion mechanism portion 121. The rack-and-pinion mechanism portion 121 of the rack-and-

However, the above process is performed when the first motor 111 is not operated, and when the first motor 111 is operated, the following changes occur.

An electric signal is generated from the vehicle speed sensor 117 for sensing the speed of the vehicle, the input angle sensor 107 and the output angle sensor 115 for sensing a change in the steering angle, and the first motor position sensor 113, The electronic control unit 125 transmits an electrical signal to the first motor 111 to drive the first motor 111. [

As the first motor 111 is driven by the above process, the worm 260 connected to the motor shaft (not shown) also rotates and is thereby engaged with the worm 260, And the carrier 290, which is integrally formed with the worm wheel 250, rotates, so that the ratio of the output angle to the input angle can be adjusted.

In the active front wheel steering apparatus of an automobile, when the automobile travels at a high speed, the driver operates the steering wheel 101 in one direction so that the input shaft 210, the first sun gear 220, and the first planetary gear 270 The electronic control unit 125 causes the worm wheel 250 and further the carrier 290 to rotate in the direction that interferes with rotation of the second planetary gear 280 connected to the first planetary gear 270 The first motor 111 is controlled so that the rotation angle of the output shaft 240 is smaller than the rotation angle of the input shaft 210 to assist in safe operation.

On the other hand, when the vehicle is in a low-speed state for parking, the active front wheel steering apparatus of the automobile is operated in such a direction that the rotational angle of the output shaft 240 is larger than the rotational angle of the input shaft 210 By controlling the first motor 111, the driver can easily operate with a smaller force.

However, in such a conventional gear ratio conversion apparatus, there is a problem that precise steering control is difficult due to backlash caused by abrasion of the gear teeth. Particularly, in a steering apparatus of an automobile, noise caused by backlash causes discomfort when steering, There has been a problem that the noise is gradually increased as it proceeds.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned background, and it is an object of the present invention to provide a planetary gear mechanism that compensates for clearance between planetary gears and sun gears by applying elastic force in a radial direction to any one of connection shafts connecting input planetary gears and output planetary gears. And to provide a planetary gear device capable of preventing noise from occurring.

The objects of the present invention are not limited thereto, and other objects not mentioned may be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, there is provided an input device comprising: an input sun gear rotating in conjunction with an input shaft; An output line gear that rotates in conjunction with an output shaft; A plurality of input planet gears circumscribing input line gears; A plurality of output planetary gears connected to the respective input planet gears via connection shafts and circumscribing output linear gears; A bearing case through which one of the connection shafts is inserted and rotatably engaged; A carrier having a coupling groove formed therein for coupling the bearing case in a radial direction so as to be slidable therethrough, the coupling being rotatably coupled with the remainder of the coupling shaft penetratingly connected to the bearing case; An elastic support for imparting an elastic force to the bearing case in the radial direction; And a support member coupled to an outer circumferential surface of the carrier and supporting the other end of the elastic supporter.

According to an embodiment of the present invention, elastic force is applied to one of connection shafts connecting the input planetary gears and the output planetary gears in the radial direction to compensate the clearance between the planetary gears and the sun gears, There is an effect that the occurrence can be prevented.

1 is a configuration diagram of an active front wheel barrel apparatus of a conventional automobile.
2 is a cross-sectional view schematically showing a gear ratio converting apparatus of an active front wheel steering apparatus of a conventional automobile.
3 is a perspective view of a planetary gear device according to an embodiment of the present invention.
4 is a partially exploded perspective view of the planetary gear set of Fig.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In describing the components of the present invention, the terms first, second, A, B, (a), (b), and the like can be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

3 is a perspective view of a planetary gear device according to an embodiment of the present invention. 4 is a partially exploded perspective view of the planetary gear set of Fig.

1, the planetary gear set 300 according to one embodiment of the present invention includes an input sun gear 411 that rotates in conjunction with an input shaft 311; An output sun gear 331 that rotates in conjunction with the output shaft 333; A plurality of input planet gears 351 that are external to the input line gear 411; A plurality of output planetary gears 371 connected to the respective input planetary gears 351 via connection shafts 431 and external to the output sun gear 331; A bearing case (320) through which one of the connection shafts is inserted and rotatably coupled; A coupling groove 491 in which the bearing case 320 is slidably coupled in the radial direction is formed and the other end of the coupling shaft 431 penetrating through the bearing case 320 is passed therethrough, (390); An elastic support 340 that provides an elastic force in the radial direction to the bearing case 320; And a support member 360 coupled to the outer circumferential surface of the carrier 390 and supporting the other end of the elastic support 340.

Hereinafter, an example in which three input planetary gears 351 and three output planetary gears 371 are provided as shown in the drawings, and an example in which the planetary gear set according to the embodiment of the present invention is used in an active front wheel steering apparatus An example will be described below.

The input line gear 411 is provided on an input shaft 311 connected to the steering wheel 101 and rotates in conjunction with the input shaft 311. A worm wheel engaged with the worm is coupled to the input shaft 311, The input shaft 311 and the input line gear 411 interlock with each other and rotate.

The output sun gear 331 is provided on the output shaft 333 and rotates in conjunction with the output shaft 333 so that the output shaft 333 is connected to the rack-and-pinion mechanism portion 121.

The input planetary gears 351 are teeth-coupled to the input line gear 411 so that the input planetary gears 351 rotate in conjunction with rotation of the input line gear 411.

The output planetary gears 371 are tooth-coupled to circumscribe the output line gear 331. Each output planetary gear 371 is connected to the input planetary gears 351 via a connection shaft so that input planetary gears 351 The output planetary gear 371 rotates in conjunction therewith.

The bearing case 320 may be formed in a box shape having a hexahedron shape and may include any one of connection shafts 431 connecting the input planetary gears 351 and the output planetary gears 371, Respectively.

That is, a through hole 421 is formed in the axial direction of the bearing case 320 so that one connection shaft 431 is penetrated and connected to the bearing case 320. The 'axial direction' is a length of the input shaft 311 and the output shaft 333 Direction.

The support case 423 is formed in the bearing case 320 so as to support one end of the elastic support body 340. The support case 423 is formed in a groove- The elastic supporter 340 can stably provide elastic force to the bearing case 320 and the guide groove 425 is formed on one side or both sides in the circumferential direction of the bearing case 320, The guide protrusion 493 formed in the coupling groove 491 of the carrier 390 is inserted.

The rotation support member 450 is coupled to the through hole 421 of the bearing case 320 so as to reduce the rotational friction between the connection shaft 431 and the connection shaft 431. The rotation support member 450 is, , And can be provided as a bush bearing.

Of course, the rotation support member 450 may be coupled to the outer circumferential surface of the connection shaft 431 which is rotatably coupled through the through hole 421 of the bearing case 320, have.

The carrier 390 may be formed in a disc shape and may include a connection shaft 431 connected to the bearing case 320 among the connection axes connecting the input planetary gears 351 and the output planetary gears 371, The shafts are pierced and engaged, and the aforementioned bearing case 320 is slidably engaged in the radial direction.

To this end, the carrier 390 is formed with an engaging groove 491 having an opening radially outward so that the bearing case 320 is slidably engaged with the engaging groove 491, and on both sides of the engaging groove 491, A guide protrusion 493 inserted into the guide groove 425 of the case 320 is formed.

When the guide groove 425 is formed only on one circumferential side of the bearing case 320, the guide protrusion 493 is formed only on one side of the coupling groove 491, And a guide groove may be formed in the engaging groove 491 of the carrier 390 and a guide projection may be formed in the bearing case 320. [

In addition, a seating groove 495 is formed in the circumferential direction of the carrier 390 so that a support member 360, which will be described later, is inserted and fixed.

The support member 360 can be stably engaged and fixed to the outer circumferential surface of the carrier 390 by forming the groove-like seating groove 495 on the outer circumferential surface of the carrier 390.

The elastic support 340 provides an elastic force in the radial direction to the bearing case 320. The elastic support 340 may be provided as a coil spring, Is supported by the support groove 423 of the case 320 and the other end is supported by a support member 360 to be described later.

Since the elastic support body 340 provides the elastic force in the radial direction to the bearing case 320, the connection shaft 431 penetratingly coupled to the bearing case 320 receives the elastic force radially inward, And the sun gears 331 and 411 can be compensated for.

The support member 360 is then coupled to an outer circumferential surface of the carrier 390 and more specifically to a seating groove 495 formed in the outer circumferential surface of the carrier 390. Such a support member 360 may be, Ring, and may also be provided as a friction bearing.

The other end of the elastic supporter 340 is supported and fixed by coupling the support member 360 to the outer circumferential surface of the carrier 390 so that the elastic force of the elastic supporter 340 is effectively transmitted to the bearing case 320.

As described above, according to the embodiment of the present invention, elastic force is applied to any one of the connecting shafts connecting the input planetary gears and the output planetary gears in the radial direction, So that noise can be prevented from being generated.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

300: A planetary gear device according to an embodiment of the present invention
311: Input shaft
320: Bearing case
331: Output Line Gear
333: Output shaft
340: elastic support
351: input planetary gear
360: support member
371: Output planetary gear
390: Carrier
411: input line gear
431: Connection axis
491: Coupling groove

Claims (5)

An input line gear that rotates in conjunction with an input shaft;
An output line gear that rotates in conjunction with an output shaft;
A plurality of input planet gears circumscribing the input line gear;
A plurality of output planetary gears connected to each of the input planetary gears via connection shafts and circumscribing the output sun gear;
A bearing case through which one of the connection shafts is inserted and rotatably coupled;
Wherein the bearing case is formed with a coupling groove in which the bearing case is slidably coupled in the radial direction, a carrier among the coupling shafts through which the rest of the coupling shafts penetrating through the bearing case are inserted and rotatably engaged;
An elastic supporter for providing elastic force to the bearing case in a radial direction; And
A support member coupled to an outer peripheral surface of the carrier and supporting the other end of the elastic support;
Wherein the planetary gear set includes: The method according to claim 1,
Wherein the bearing case is formed with a support groove for supporting one end of the elastic supporter in the radial direction. 3. The method of claim 2,
Wherein a guide protrusion is formed on one side of the circumferential direction of the bearing case and one side of the engaging groove facing the bearing case, and a guide groove for inserting the guide protrusion is formed in the remainder. The method of claim 3,
Further comprising a rotation support member coupled to an outer circumferential surface of the connection shaft so as to reduce a rotational friction force of the connection shaft coupled to the bearing case. 5. The method according to any one of claims 1 to 4,
And a seating groove is formed in the outer peripheral surface of the carrier so that the supporting member is inserted and fixed.
KR1020130067643A 2013-06-13 2013-06-13 Planetary Gear Apparatus KR20140145347A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170125539A (en) 2016-05-04 2017-11-15 주식회사 만도 Reducer of Electronic Power Steering Apparatus
KR101879129B1 (en) 2017-06-09 2018-07-16 주식회사 만도 Reducer of Electric Power Steering Apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170125539A (en) 2016-05-04 2017-11-15 주식회사 만도 Reducer of Electronic Power Steering Apparatus
KR101879129B1 (en) 2017-06-09 2018-07-16 주식회사 만도 Reducer of Electric Power Steering Apparatus

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