KR20110046797A - Reducer of Electronic Power Steering Apparatus - Google Patents

Reducer of Electronic Power Steering Apparatus Download PDF

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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
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KR
South Korea
Prior art keywords
worm shaft
worm
circumferential surface
reducer
bearing
Prior art date
Application number
KR1020090103459A
Other languages
Korean (ko)
Inventor
김태식
김태혁
Original Assignee
주식회사 만도
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Filing date
Publication date
Application filed by 주식회사 만도 filed Critical 주식회사 만도
Priority to KR1020090103459A priority Critical patent/KR20110046797A/en
Publication of KR20110046797A publication Critical patent/KR20110046797A/en

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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
    • 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
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Power Steering Mechanism (AREA)

Abstract

PURPOSE: A reducer of a secondary electric-powered steering system is provided to reduce the rattle noise generated by the impact delivered from a road through a wheel and steering column. CONSTITUTION: A reducer of a secondary electric-powered steering system comprises a worm axis(254) and a worm axis bearing(257). The worm axis has one or more grooves(305) on the outer circumference of the end part connected to a motor shaft. The worm axis bearing supports the rotation of the worm axis and pivoted in vertical and worm axis directions. The worm axis bearing is combined between a gear housing(260) and the outer circumference of the location where the groove of the worm axis is formed. A stop ring(315), for preventing the separation of the worm axis bearing, is combined between a stopper part and the outer side surface of the worm axis bearing.

Description

Reducer of Electronic Power Steering Apparatus

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 steering device 100 includes a steering system 130 and steering which extends from the steering wheel 102 to both wheels 126. And an auxiliary power mechanism 140 that provides steering assistance power to the system 130.

Steering system 130 is a steering shaft 106, one side is connected to the steering wheel 102 to rotate together with the steering wheel 102 and the other side is connected to the pinion shaft 108 via a pair of universal joint 104 It is configured to include). In addition, the pinion shaft 108 is connected to the rack bar 112 through the rack pinion mechanism unit 110, both ends of the rack bar 112 through the tie rods 122 and the knuckle arm 124 of the vehicle wheel 126 Is connected to.

The auxiliary power mechanism 140 senses torque applied to the steering wheel 102 by the driver and outputs an electrical signal proportional to the detected torque based on the electrical signal transmitted from the torque sensor 142 and the torque sensor 142. The steering shaft 106 controls the electronic control device 144 that generates the control signal, the motor 146 that generates auxiliary power based on the control signal transmitted from the electronic control device 144, and the auxiliary power generated by the motor 146. It comprises a reducer 150 having a worm 152 and a worm wheel 156 for delivery to.

Accordingly, in the electric power assist steering device, torque generated by the rotation of the steering wheel 102 is transmitted to the rack bar 112 via the rack pinion mechanism unit 110, and the assist power generated in the motor 146 is generated according to the generated torque. It is configured to be delivered to the rack bar 112.

That is, the torque generated by the rotation of the steering wheel 102 and the auxiliary power generated by the motor 146 are combined to move the rack bar 112 in the axial direction.

2 is a cross-sectional view showing a reducer of a conventional electric power assisted steering device. As shown in FIG. 2, the reducer 150 includes a worm shaft 254 having a worm 152 formed thereon, and a worm shaft bearing at both ends of the worm shaft 254. 257 are respectively installed to support the worm shaft 254, the plug bolt 210 is damped coupler 240 and the worm shaft bearing in order to prevent the worm shaft bearing 257 is spaced in the axial direction of the worm shaft 254 ( 257, and the plug bolt 210 is fixed by the plug nut 220.

The worm shaft 254 has a structure in which the worm shaft 254 is rotated by the driving of the motor 146 by connecting the motor 146 and the damping coupler 240 as a medium.

And the worm wheel 156 is provided on one side of the outer diameter of the worm 152 so that the worm 152 formed on the worm shaft 254, the worm wheel 156 is a steering wheel (102 in FIG. And a rotational force of the worm shaft 254 driven by the driving of the motor 146 is transmitted to the steering shaft 106.

The gear housing 260 includes a motor 146 which is provided with a worm 152, a worm wheel 156, and the like, and provides a driving force to the worm shaft 254 on one side of the gear housing 260. Motor 146 is coupled to bolt 250 by motor cover 230.

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 reduction gear 300 of the electric power assisted steering apparatus according to the first embodiment of the present invention includes a worm shaft 254 having one or more grooves 305 provided on the outer circumferential surface of the end portion connected to the motor shaft. ); And a worm shaft bearing 257 coupled between the gear housing 260 and the outer circumferential surface of the portion where the groove 305 of the worm shaft 254 is formed to support the rotation of the worm shaft 254.

The worm shaft bearing 257 supports the rotation of the worm shaft 254 by the ball 258 is coupled between the inner ring 270 and the outer ring 280, wherein the worm shaft bearing, the inner ring 270 and the first outer ring ( The ball is coupled between the 323 and the outer circumferential surface of the first outer ring 323 and the inner circumferential surface of the second outer ring 325 are combined to be curved to pivot perpendicularly to the direction of the worm shaft 254 to rotate the worm shaft 254. It may be a pivot type worm shaft bearing 320 is coupled between the outer peripheral surface of the portion where the groove 305 of the worm shaft 254 is formed to support the gear housing 260 to support.

The end portion connected to the motor shaft of the worm shaft 254 is formed with a engaging portion 310 is formed stepped, the separation of the worm shaft bearing 257 between the engaging portion 310 and the outer surface of the worm shaft bearing 257 Stop ring 315 is coupled to prevent.

The reducer 300 assists the driver's steering force by rotating the steering shaft 106 while the worm 152 and the worm wheel 156 are interlocked by the driving force of the motor 146. The worm shaft bearing 257 is fastened to both ends of the worm shaft 254 interlocked with the shaft of 146 to support rotation of the worm shaft 254, and the worm wheel 156 and the worm 152 interlocked with the steering shaft 105. Is built into the gear housing 260.

The worm shaft bearing 257 is mounted inside the gear housing 260 and supports the rotation of the worm shaft 254 at both ends of the worm shaft 254 and reduces the rotational resistance of the worm shaft 254. The worm shaft 254 and the motor shaft The coupled portion is a connection portion between the shaft and the shaft, so that manufacturing errors and assembly errors accumulate, thereby increasing the amount of engagement of the bearing, thereby increasing the rotational resistance of the worm shaft 254.

Accordingly, at one end of the motor shaft engaging portion of the worm shaft 254, one or more grooves 305 are formed on the outer circumferential surface of the worm shaft 254 spaced apart from each other in the axial direction or spaced at a predetermined angle from the axial direction. By coupling the worm shaft bearing 257 to the outer side of the), the amount of engagement between the worm shaft 254 and the worm shaft bearing 257 is reduced and the rotational resistance of the worm shaft is reduced.

This phenomenon is not in surface contact with the entire outer circumferential surface of the worm shaft 254 when the worm shaft bearing 257 is engaged with the worm shaft 254 having the groove 305 formed therein, and the inner ring 270 of the worm shaft bearing may be elastically deformed. The groove 305 which provides a space there is created an effect such that a gap is formed, thereby eliminating the feeling of engagement between the worm shaft 254 and the worm shaft bearing 257.

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 worm shaft 254 can be pivoted perpendicular to the axial direction, the pivot type worm shaft bearing 320 is the inner ring 270 and the ball 258 ), The first outer ring 323 and the second outer ring 325, the ball 258 is coupled between the inner ring 270 and the first outer ring 323 and the first outer ring 323 and the second outer ring ( 325 is coupled to the curved surface, the outer circumferential surface of the first outer ring 323 and the inner circumferential surface of the second outer ring 325 is formed as a curved surface, so that the first outer ring 323 is supported on the inner circumferential surface of the second outer ring 325 The worm shaft 254 and the pivot movement to rotate in the vertical direction.

That is, when the shock transmitted from the road surface through the wheel and the steering shaft 105 is transmitted to the worm wheel 156, the worm shaft 254 engaged with the worm wheel 156 performs the pivoting movement while rotating in a direction perpendicular to the worm shaft. When absorbing and assembling the worm shaft bearings 254 of the pivot type to the worm shaft 254, the worm shaft 254 is assembled by applying a preload to the worm wheel 156, resulting in an increase in backlash during wear of the worm wheel 156. Rattle noise can be reduced.

Therefore, while reducing the rotational resistance between the worm shaft 254 and the worm shaft bearing, it is possible to reduce rattle noise caused by an increase in backlash when the worm wheel 156 wears, and an impact transmitted from the road surface through the wheels and the steering shaft 106. When the worm wheel 156 is transmitted to the worm wheel 156, the worm shaft 254 engaged with the worm wheel 156 may absorb a shock while performing a pivoting movement that rotates in a vertical direction with the worm shaft 254.

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 reduction gear 300 of the electric power assisted steering apparatus according to the second embodiment of the present invention includes: a worm shaft 254 connected to the motor shaft and rotating; And a worm shaft coupled between the outer circumferential surface of the end connected to the motor shaft of the worm shaft 254 and the gear housing 260 to support the rotation of the worm shaft 254, and having one or more grooves 305 provided on the inner circumferential surface of the inner ring. It is configured to include a bearing (257).

The end portion connected to the motor shaft of the worm shaft 254 is formed with a engaging portion 310 which is formed stepped, the separation of the worm shaft bearing 257 between the engaging portion 310 and the outer surface of the worm shaft bearing 257 Stop ring 315 is coupled to prevent.

The worm shaft bearing 257 is coupled to the ball 258 between the inner ring 270 and the outer ring 280 to support the rotation of the worm shaft 254, wherein the worm shaft bearing is formed spaced apart from each other in the axial direction on the inner circumferential surface Or the ball 258 is coupled between the inner ring 270 and the first outer ring 323 having one or more grooves 305 formed spaced apart from each other by an axial direction and the first outer ring 323. The outer circumferential surface of the end and the inner circumferential surface of the second outer ring 325 is coupled to the curved surface perpendicular to the direction of the worm shaft 254 while being connected to the motor shaft of the worm shaft 254 to support the rotation of the worm shaft 254 It may be a pivot type worm shaft bearing 320 coupled between the outer peripheral surface and the gear housing 260.

Therefore, when the shock transmitted from the road surface through the wheel and the steering shaft 105 is transmitted to the worm wheel 156, the worm shaft 254 engaged with the worm wheel 156 performs the impact while pivoting in a direction perpendicular to the worm shaft. When absorbing and assembling the pivot type axial bearing 320 to the worm shaft 254, assembling the worm shaft 254 while preloading the worm wheel 156 toward the worm wheel 156, an increase in backlash occurs when the worm wheel 156 wears. Rattle noise can be reduced.

In addition, while reducing the rotational resistance between the worm shaft 254 and the worm shaft bearing 257, it is possible to reduce the rattle noise caused by the increase of backlash when the worm wheel 156 is worn, and from the road surface through the wheel and the steering shaft 106 When the transmitted shock is transmitted to the worm wheel 156, the worm shaft 254 engaged with the worm wheel 156 may absorb the shock while performing a pivoting movement that rotates in a vertical direction with the worm shaft 254.

This is not a surface contact with the entire outer circumferential surface of the worm shaft 254 when the worm shaft bearing 257 in which the groove 305 is formed is engaged with the worm shaft 254, and a space in which the inner ring 270 of the worm shaft bearing can elastically deform. Due to the groove 305 to provide the same effect as the gap is formed is to eliminate the grip between the worm shaft 254 and the worm shaft bearing 257.

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>

Bearing stress value
(MPa) Radial dimension change
(μm) Rotation torque value
(gcm) Grooved 339.5 5.4 50 Grooved radish 586.6 9.3 66

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)

A worm shaft having one or more grooves provided on an outer circumferential surface of the end portion connected to the motor shaft; And The ball of the worm shaft 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 pivoting perpendicularly to the worm shaft direction. A worm shaft bearing coupled between the outer circumferential surface of the formed portion and the gear housing; Reducer of the electric power assisted steering apparatus, characterized in that it comprises a. The method of claim 1, The groove is formed in the axial direction spaced apart from each other in the circumferential surface of the motor shaft end, or the reducer of the electric power assisted steering apparatus, characterized in that is formed spaced apart from the axial direction by a predetermined angle. A worm shaft connected to the motor shaft and rotating; And The ball is coupled between the inner ring and the first outer ring provided with 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 so as to pivot perpendicularly to the direction of the worm shaft. A worm shaft bearing coupled between the gear housing and the outer circumferential surface of the end portion connected to the motor shaft of the worm shaft to support the worm shaft bearing; Reducer of the electric power assisted steering apparatus, characterized in that it comprises a. The method of claim 3, wherein The groove is formed in the circumferential direction of the worm shaft bearing spaced apart from each other in the axial direction, or reducer of the electric power assisted steering apparatus, characterized in that formed in the axial direction spaced apart. The method according to any one of claims 1 to 4, An end portion connected to the motor shaft of the worm shaft is formed with a stepped portion formed therein, and a stop ring for preventing the worm shaft bearing from being separated between the engaging portion and the outer surface of the worm shaft bearing is coupled. Reduction gear for auxiliary steering.
KR1020090103459A 2009-10-29 2009-10-29 Reducer of Electronic Power Steering Apparatus KR20110046797A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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