KR20110046797A - Reducer of Electronic Power Steering Apparatus - Google Patents
Reducer of Electronic Power Steering Apparatus Download PDFInfo
- Publication number
- KR20110046797A KR20110046797A KR1020090103459A KR20090103459A KR20110046797A KR 20110046797 A KR20110046797 A KR 20110046797A KR 1020090103459 A KR1020090103459 A KR 1020090103459A KR 20090103459 A KR20090103459 A KR 20090103459A KR 20110046797 A KR20110046797 A KR 20110046797A
- Authority
- KR
- South Korea
- Prior art keywords
- worm shaft
- worm
- circumferential surface
- reducer
- bearing
- Prior art date
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D3/00—Steering gears
- B62D3/02—Steering gears mechanical
- B62D3/04—Steering gears mechanical of worm type
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- 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
- B62D5/0421—Electric motor acting on or near steering gear
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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
- 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
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- 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
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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
- 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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
The present invention relates to a speed reducer of an electric power assisted steering device. More specifically, in the reduction gear of the electric power assisted steering device, the driver's steering feeling is reduced by reducing the locking and rotational resistance of the worm shaft and the worm shaft bearing, and at the same time, the increase in the backlash caused by the wear of the worm and the worm wheel, or the wheel from the road surface. And a reducer of an electric power assisted steering device which can reduce rattle noise generated by an impact transmitted through a steering shaft.
1 is a configuration diagram of a conventional electric power assisted steering device, as shown in FIG. 1, the electric power assisted
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 portions of the worm shaft and the motor shaft, causing a bearing jam and increasing the rotational resistance of the worm shaft.
In addition, when the worm and the worm wheel are durable, play may occur due to wear, and rattle noise may occur due to backlash, and when the steering wheel is operated by the driver due to the rattle noise due to the shock transmitted from the road surface through the wheel and the steering shaft. There was a problem that caused discomfort.
Accordingly, the present invention has been made to solve the above problems, in the reduction gear of the electric power assisted steering device, while reducing the locking and rotational resistance of the worm shaft and the worm shaft bearing to increase the steering feeling of the driver, and at the same time to the wear of the worm and worm wheel It is an object of the present invention to provide a speed reducer of an electric power assist steering device that can reduce rattle noise caused by an increase in backlash or an impact transmitted through a wheel and a steering shaft from a road surface.
In order to achieve this object, a first embodiment of the present invention includes a worm shaft having one or more grooves provided on an outer circumferential surface of an end portion connected to a motor shaft; And a ball is coupled between the inner ring and the first outer ring, and the outer circumferential surface of the first outer ring and the inner circumferential surface of the second outer ring are curved to support the rotation of the worm shaft while being pivoted perpendicularly to the worm shaft direction. It provides a reducer of the electric power assist steering device comprising a; worm shaft bearing coupled between the outer peripheral surface of the formed portion and the gear housing.
In addition, a second embodiment of the present invention, the worm shaft is connected to the motor shaft to rotate; And a ball is coupled between the inner ring and the first outer ring having one or more grooves on the inner circumferential surface, and the outer circumferential surface of the first outer ring and the inner circumferential surface of the second outer ring are combined into a curved surface to pivot perpendicularly to the worm shaft direction. And a worm shaft bearing coupled between the outer circumferential surface of the end connected to the motor shaft of the worm shaft and the gear housing so as to support the worm shaft.
According to the present invention, in the reduction gear of the electric power assisted steering apparatus, the driver's steering feeling is reduced by reducing the locking feeling and rotational resistance of the worm shaft and the worm shaft bearing, and at the same time, the backlash caused by the wear of the worm and the worm wheel is increased, or from the road surface. Rattle noise generated by the impact transmitted through the wheels and the steering shaft can also be reduced.
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".
3A and 3B are cross-sectional views showing a reducer of the electric power assisted steering apparatus according to the first embodiment of the present invention.
As shown in these drawings, the
The worm shaft bearing 257 supports the rotation of the
The end portion connected to the motor shaft of the
The
The worm shaft bearing 257 is mounted inside the
Accordingly, at one end of the motor shaft engaging portion of the
This phenomenon is not in surface contact with the entire outer circumferential surface of the
Therefore, the outer circumferential surface diameter of the worm shaft can be simply reduced to increase the gap between the worm shaft bearing and the bearing.
Here, the worm shaft bearing is coupled to the worm shaft bearing 320 of the pivot type so that the
That is, when the shock transmitted from the road surface through the wheel and the steering shaft 105 is transmitted to the
Therefore, while reducing the rotational resistance between the
4A and 4B are cross-sectional views showing a reducer of the electric power assisted steering apparatus according to the second embodiment of the present invention.
As shown in these drawings, the
The end portion connected to the motor shaft of the
The worm shaft bearing 257 is coupled to the
Therefore, when the shock transmitted from the road surface through the wheel and the steering shaft 105 is transmitted to the
In addition, while reducing the rotational resistance between the
This is not a surface contact with the entire outer circumferential surface of the
Therefore, the outer circumferential surface diameter of the worm shaft can be simply reduced to increase the gap between the worm shaft bearing and the bearing.
In the first embodiment and the second embodiment of the present invention, the results of the self measurement according to the presence or absence of the grooves are shown in Table 1 below.
<Table 1>
(MPa)
(μm)
(gcm)
Here, the bearing stress value is a stress value generated when the worm shaft bearing is press-fitted into the worm shaft, and the radial dimensional change represents the amount that the inner ring of the bearing is pressed by the worm shaft when the inner diameter of the worm shaft bearing is press-fitted to the worm shaft. The torque value represents the torque value applied when the worm shaft rotates.
According to the embodiments of the present invention having such a shape and structure, in the reduction gear of the electric power assisted steering apparatus, while reducing the locking and rotational resistance of the worm shaft and worm shaft bearing to increase the steering feeling of the driver, at the same time to the wear of the worm and worm wheel Due to the increase in the backlash due to, or the impact caused by the impact transmitted through the wheel and the steering shaft from the road surface is also an effect that can be reduced.
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. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of 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;
3A and 3B are cross-sectional views showing a reducer of the electric power assisted steering apparatus according to the first embodiment of the present invention.
4A and 4B are cross-sectional views showing a reducer of the electric power assisted steering apparatus according to the second embodiment of the present invention.
<Description of the symbols for the main parts of the drawings>
106: steering shaft 146: motor
152: worm 156: worm wheel
254: worm shaft 257: worm shaft bearing
260: gear housing 305: groove
310: engaging portion 315: stop ring
320: pivot type worm shaft bearing 323: first outer ring
325: second paddle wheel
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020090103459A KR20110046797A (en) | 2009-10-29 | 2009-10-29 | Reducer of Electronic Power Steering Apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020090103459A KR20110046797A (en) | 2009-10-29 | 2009-10-29 | Reducer of Electronic Power Steering Apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
KR20110046797A true KR20110046797A (en) | 2011-05-06 |
Family
ID=44238180
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020090103459A KR20110046797A (en) | 2009-10-29 | 2009-10-29 | Reducer of Electronic Power Steering Apparatus |
Country Status (1)
Country | Link |
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KR (1) | KR20110046797A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108372880A (en) * | 2017-02-01 | 2018-08-07 | 株式会社万都 | The retarder of electric power steering apparatus |
CN112061232A (en) * | 2020-09-29 | 2020-12-11 | 西安电子科技大学芜湖研究院 | Intelligent electric power-assisted steering system of commercial vehicle |
-
2009
- 2009-10-29 KR KR1020090103459A patent/KR20110046797A/en not_active Application Discontinuation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108372880A (en) * | 2017-02-01 | 2018-08-07 | 株式会社万都 | The retarder of electric power steering apparatus |
US11173950B2 (en) | 2017-02-01 | 2021-11-16 | Mando Corporation | Reducer of electric power-assisted steering apparatus |
CN112061232A (en) * | 2020-09-29 | 2020-12-11 | 西安电子科技大学芜湖研究院 | Intelligent electric power-assisted steering system of commercial vehicle |
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