KR20110076112A - Reducer of electronic power steering apparatus and electronic power steering apparatus using the same - Google Patents
Reducer of electronic power steering apparatus and electronic power steering apparatus using the same Download PDFInfo
- Publication number
- KR20110076112A KR20110076112A KR20090132730A KR20090132730A KR20110076112A KR 20110076112 A KR20110076112 A KR 20110076112A KR 20090132730 A KR20090132730 A KR 20090132730A KR 20090132730 A KR20090132730 A KR 20090132730A KR 20110076112 A KR20110076112 A KR 20110076112A
- Authority
- KR
- South Korea
- Prior art keywords
- damper
- worm
- worm shaft
- housing
- electric power
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0409—Electric motor acting on the steering column
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/22—Arrangements for reducing or eliminating reaction, e.g. vibration, from parts, e.g. wheels, of the steering system
-
- 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
- F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
- F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
- F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
- F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
-
- 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
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
- F16H55/24—Special devices for taking up backlash
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2306/00—Other features of vehicle sub-units
- B60Y2306/09—Reducing noise
-
- 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
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
- F16H2057/0213—Support of worm gear shafts
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Steering Mechanism (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
Abstract
Description
The present invention relates to a speed reducer of an electric power assisted steering device. More specifically, it reduces rattle noise caused by an increase in backlash due to wear of worms and worm wheels, or an impact transmitted from the road surface through the wheels and steering shafts, and reduces the grip and rotational resistance of the worm shafts and worm shaft bearings. The present invention relates to a speed reducer of an electric power assist steering device for increasing a steering feeling of an electric power assist steering device and an electric power assist steering device using the same.
1 is a configuration diagram of a conventional electric power assisted steering device, as shown in FIG. 1, the electric power assisted
The
The
Accordingly, in the electric power assist steering device, torque generated by the rotation of the
That is, the torque generated by the rotation of the
2 is a cross-sectional view showing a reducer of a conventional electric power assisted steering device. As shown in FIG. 2, the
The
And the
The
The speed reducer of the electric power assisted steering device having such a structure controls the driving of the motor by an electronic control device provided in the vehicle according to the vehicle driving conditions, and the rotational force of the worm shaft by the driving of the motor controls the steering wheel of the driver. In addition to the rotational force is transmitted to the steering shaft, so that the steering operation state of the driver can be kept smooth and stable.
However, the reduction gear of the conventional electric power assist steering device has a problem in that manufacturing errors and assembly errors accumulate on the coupling portion of the worm shaft and the motor shaft, causing a bearing jam and increasing rotational resistance of the worm shaft, and also a worm and a worm wheel. When this durability progresses, play occurs due to abrasion, rattle noise occurs due to backlash, and shock caused by the rattle noise caused by the impact transmitted through the wheels and the steering shaft from the road surface to cause discomfort to the driver when operating the steering wheel. There was this.
Accordingly, the present invention has been made to solve the above-described problems, reducing the rattle noise caused by the increase in backlash due to the wear of the worm and the worm wheel, or the impact transmitted through the wheel and the steering shaft from the road surface, The purpose is to increase the steering feeling of the driver by reducing the grip and rotational resistance of the worm shaft bearing.
In order to achieve the above object, an embodiment of the present invention includes a worm shaft bearing having a worm formed at its center and supporting rotation at both ends thereof so as to absorb vibration and noise generated by friction and wear during operation of the worm and the worm wheel. A worm shaft coupled to the outer circumferential surface of one end or both ends to which the worm shaft bearing is coupled; A gear housing accommodating the gear mechanism including the worm shaft, the worm shaft bearing, and the worm wheel; And a damper coupled between the opposite end of the motor shaft connection portion of the worm shaft and the gear housing to support the worm shaft in an axial direction.
In addition, an embodiment of the present invention, in the electric power assist steering device for assisting the steering force of the steering wheel via the reducer and the motor, the reducer, vibration and noise generated by friction and wear during operation of the worm and worm wheel The worm shaft has a worm formed therein, and a worm shaft bearing for supporting rotation at both ends thereof is coupled to the center thereof, and a dustproof member is provided at an outer circumferential surface of one end or both ends to which the worm shaft bearing is coupled; A gear housing accommodating the gear mechanism including the worm shaft, the worm shaft bearing, and the worm wheel; And a damper coupled between the opposite end of the motor shaft connection portion of the worm shaft and the gear housing to support the worm shaft in an axial direction.
According to the present invention, the rattle noise generated by the increase in backlash due to the wear of the worm and the worm wheel, or the impact transmitted through the wheel and the steering shaft from the road surface is also reduced, reducing the grip and rotational resistance of the worm shaft and the worm shaft bearing. It is effective to increase the steering feeling.
Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to that other component, but there may be another configuration between each component. It is to be understood that the elements may be "connected", "coupled" or "connected".
3 is a cross-sectional view showing a reducer of the electric power assisted steering apparatus according to the first embodiment of the present invention, and FIG. 4 is a cross-sectional view showing a reducer of the electric power assisted steering apparatus according to the second embodiment of the present invention. FIG. 6 is an exploded perspective view illustrating the damper and the damper housing of FIG. 4, and FIG. 7 is a graph illustrating damping characteristics of the reducer according to embodiments of the present disclosure.
First, as shown in FIG. 3, the speed reducer of the electric power assisted steering apparatus according to the first embodiment of the present invention is configured to absorb vibrations and noises generated by friction and wear during operation of the
In addition, the reducer according to the second embodiment of the present invention shown in Figure 4 is wrapped around the outer surface of the
The worm shaft bearing 257 coupled to the end portion of the
The reducer assists the driver's steering force by rotating the
The worm shaft bearing 257 is mounted inside the
In addition, when the external force transmitted from the road surface through the wheel and the
Therefore, the external force transmitted through the
Accordingly, both sides of the
In addition, the
Such a reducer may further include a
The
That is, the
Here, the fixing
In addition, the
Here, the damping
That is, when the load transmitted is small, the load is supported by the elastic force of the damping
This shows a load-displacement curve in which the displacement of the damping
Therefore, even if the external force transmitted through the steering shaft and the worm wheel on the road surface and the load generated during the operation of the worm and the worm wheel are transmitted in various forms having a range of small value to large value, various types of rattles can be generated in the reducer by absorbing it It will reduce the noise.
Here, the
On the other hand, the reducer according to the embodiments of the present invention, referring to Figure 1 together in the electric power assist steering device for assisting the steering force of the steering wheel via the reducer and the
According to the embodiments of the present invention having such a shape and structure, the rattle noise caused by the increase in backlash due to the wear of the worm and the worm wheel, or the impact transmitted through the wheel and the steering shaft from the road surface is also reduced. By reducing the grip and rotational resistance of the worm shaft bearings, the driver's steering feeling is increased.
In the above description, all elements constituting the embodiments of the present invention are described as being combined or operating in combination, but the present invention is not necessarily limited to the embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more.
In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be included, unless otherwise stated, and thus excludes other components. It should be construed that it may further include other components instead.
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. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.
1 is a block diagram of a conventional electric power assisted steering device;
2 is a cross-sectional view showing a reducer of a conventional electric power assisted steering device;
3 is a cross-sectional view showing a reducer of the electric power assisted steering apparatus according to the first embodiment of the present invention;
4 is a cross-sectional view showing a reducer of the electric power assisted steering apparatus according to the second embodiment of the present invention;
5 and 6 are exploded perspective views showing the damper and damper housing of FIG.
7 is a graph showing the damping characteristics of the reducer according to embodiments of the present invention.
<Description of the symbols for the main parts of the drawings>
247: worm shaft bearing 310: engaging portion
320: dustproof member 330: damper
333: large neck 335: small neck
340: elastomer 343: damper housing
345: damping protrusion 350: fixing member
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020090132730A KR101315666B1 (en) | 2009-12-29 | 2009-12-29 | Reducer of Electronic Power Steering Apparatus and Electronic Power Steering Apparatus using The Same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020090132730A KR101315666B1 (en) | 2009-12-29 | 2009-12-29 | Reducer of Electronic Power Steering Apparatus and Electronic Power Steering Apparatus using The Same |
Publications (2)
Publication Number | Publication Date |
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KR20110076112A true KR20110076112A (en) | 2011-07-06 |
KR101315666B1 KR101315666B1 (en) | 2013-10-08 |
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KR1020090132730A KR101315666B1 (en) | 2009-12-29 | 2009-12-29 | Reducer of Electronic Power Steering Apparatus and Electronic Power Steering Apparatus using The Same |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20180078070A (en) * | 2016-12-29 | 2018-07-09 | 이래에이엠에스 주식회사 | Motor-driven power steering system |
KR20180078050A (en) * | 2016-12-29 | 2018-07-09 | 이래에이엠에스 주식회사 | Motor-driven power steering system |
KR200489020Y1 (en) * | 2017-12-01 | 2019-04-18 | 계양전기 주식회사 | Actuator apparatus having damping means |
CN109707796A (en) * | 2019-01-09 | 2019-05-03 | 银川威力传动技术股份有限公司 | A kind of rotary reducer with damping torque |
EP3572301A1 (en) * | 2018-05-18 | 2019-11-27 | Mando Corporation | Reducer of electric power steering apparatus |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109861436A (en) * | 2017-11-30 | 2019-06-07 | 马渊马达株式会社 | The axial damping structure and electric motor units of electric motor units |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3765276B2 (en) * | 2002-03-06 | 2006-04-12 | 株式会社ジェイテクト | Electric power steering device |
KR20090082821A (en) * | 2008-01-28 | 2009-07-31 | 현대모비스 주식회사 | Column assist type electric power steering system |
-
2009
- 2009-12-29 KR KR1020090132730A patent/KR101315666B1/en active IP Right Grant
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20180078070A (en) * | 2016-12-29 | 2018-07-09 | 이래에이엠에스 주식회사 | Motor-driven power steering system |
KR20180078050A (en) * | 2016-12-29 | 2018-07-09 | 이래에이엠에스 주식회사 | Motor-driven power steering system |
CN110121457A (en) * | 2016-12-29 | 2019-08-13 | 怡来汽车电子底盘系统有限公司 | Electric boosting steering system |
KR200489020Y1 (en) * | 2017-12-01 | 2019-04-18 | 계양전기 주식회사 | Actuator apparatus having damping means |
EP3572301A1 (en) * | 2018-05-18 | 2019-11-27 | Mando Corporation | Reducer of electric power steering apparatus |
US11346435B2 (en) | 2018-05-18 | 2022-05-31 | Mando Corporation | Reducer of electric power steering apparatus |
CN109707796A (en) * | 2019-01-09 | 2019-05-03 | 银川威力传动技术股份有限公司 | A kind of rotary reducer with damping torque |
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