KR20140104133A - Electric Power Steering Apparatus for vehicle - Google Patents

Electric Power Steering Apparatus for vehicle Download PDF

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Publication number
KR20140104133A
KR20140104133A KR1020130017889A KR20130017889A KR20140104133A KR 20140104133 A KR20140104133 A KR 20140104133A KR 1020130017889 A KR1020130017889 A KR 1020130017889A KR 20130017889 A KR20130017889 A KR 20130017889A KR 20140104133 A KR20140104133 A KR 20140104133A
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KR
South Korea
Prior art keywords
shaft
steering
coupled
rack
force
Prior art date
Application number
KR1020130017889A
Other languages
Korean (ko)
Inventor
정영석
Original Assignee
주식회사 만도
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 주식회사 만도 filed Critical 주식회사 만도
Priority to KR1020130017889A priority Critical patent/KR20140104133A/en
Publication of KR20140104133A publication Critical patent/KR20140104133A/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
    • B62D3/12—Steering gears mechanical of rack-and-pinion 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
    • 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
    • B62D5/0442—Conversion of rotational into longitudinal movement
    • 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
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/20—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application
    • B62D5/22—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle specially adapted for particular type of steering gear or particular application for rack-and-pinion type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • B62D6/08—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
    • B62D6/10—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque characterised by means for sensing or determining torque

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)

Abstract

The present invention relates to an electric power steering apparatus for an automobile. According to an embodiment of the present invention, an elastic support is coupled to a second shaft to maintain the driver's steering feel by the elastic force of the elastic support, and the steering force for linearly moving the rack bar So that the structure of the steering apparatus can be simplified, the weight can be reduced, and the production cost can be reduced.

Figure P1020130017889

Description

TECHNICAL FIELD [0001] The present invention relates to an electric power steering apparatus,

[0001] The present invention relates to an electric power steering apparatus for an automobile, and more particularly, to an electric power steering apparatus for an automobile which comprises an elastic support body coupled to a second shaft to maintain a driver's steering feel by an elastic force of the elastic support body, The present invention relates to an electric motor-driven steering device of a vehicle, which can simplify a steering device structure, reduce weight, and reduce production costs.

1 is a schematic view of an electric steering system of a conventional automobile.

1, a conventional electric motor-driven steering apparatus includes a steering wheel 110, a steering shaft 135, a torque sensor 120, an ECU 130, a driving unit 140, a rack bar 190, And includes a first pinion gear 160, a first rack gear 150, a second pinion gear 170, a second rack gear 180, and a link portion 195.

When the driver rotates the steering wheel 110, the steering shaft 135 rotates, whereby the first pinion gear 160 formed at the end of the steering shaft 135 rotates, and the first pinion gear 160 rotates The first pinion gear 160 is engaged with the first rack gear 150 formed on the rack bar 190 so that the rotational motion of the first pinion gear 160 is converted into the lateral movement of the rack bar 190, (145).

A torque sensor 120, a steering angle sensor 115, a vehicle speed sensor 125 and the like are provided as sensing means for assisting the steering force of the driver. When the driver rotates the steering wheel 110, The steering angle sensor 115 senses the rotation angle of the steering wheel 110 and the vehicle speed sensor 125 senses the speed of the vehicle to detect an electric And transmits the converted signal to the ECU 130.

The ECU 130 calculates an electric signal and transmits the electric signal to the driving unit 140. The driving unit including the driving motor (not shown), the torque limiter (not shown), the speed reducer (not shown), and the second pinion gear 170, The second pinion gear 170 is rotated according to the torque, the rotation angle, and the speed of the automobile received from the first rack gear 130, thereby providing the steering assist force to the rack bar 190 having the second rack gear 180 .

The first pinion gear 160 engaged with the first rack gear 150 is rotated by the linear movement of the rack bar 190 by the rotational force of the steering shaft 135 as described above The coupling structure of the first pinion gear 160 and the first rack gear 150 is complicated in terms of making the driver feel the steering feel, And a cost increase due to the machining process of the first rack gear 150 and the first pinion gear 160.

The present invention has been made in view of the above background, and it is an object of the present invention to provide a steering apparatus for a steering apparatus, which is configured such that an elastic supporter is coupled to a second shaft to maintain a driver's steering feel as an elastic force of the elastic supporter, The present invention aims at providing an electric motor-driven steering device capable of reducing the weight and manufacturing cost of the vehicle.

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 a steering apparatus comprising: a second shaft coupled to a steering shaft to receive a rotational force of a steering wheel and coupled to a first shaft having a torque sensor via a torsion bar; An elastic support having one end coupled to an inner circumferential surface of the rack housing surrounding the second shaft and the other end coupled to the second shaft to provide an elastic force upon rotation of the second shaft; A pinion gear provided in the rack housing and meshing with a rack gear formed on a rack bar moving in a straight line, a motor for providing a rotational driving force to the pinion gear, a steering angle sensor for sensing a rotation angle of the steering shaft and a vehicle speed sensor And a driving unit including a control unit for receiving and controlling the motor. The steering apparatus for an automobile may be provided.

According to an embodiment of the present invention, the steering force for holding the driver's steering feel by the resilient force of the elastic support by coupling the elastic support to the second shaft, and the steering force for linearly moving the rack bar can be handled by a separate driving unit, The weight can be saved, and the production cost can be reduced.

1 is a schematic view of an electric steering system of a conventional automobile.
2 is a schematic view of an electric steering system for an automobile according to an embodiment of the present invention.
FIG. 3 is a view showing the structure of the first axis, the second axis, the elastic support, and the driving unit of FIG. 2;
FIG. 4 is a partially exploded perspective view showing the structure of the first axis, the second axis, and the elastic support of FIG. 3;
FIG. 5 is a partial cross-sectional view showing the structure of the first axis, the second axis, and the elastic support of FIG. 4;

2 is a schematic view of an electric steering system for an automobile according to an embodiment of the present invention.

FIG. 3 is a view showing the structure of the first axis, the second axis, the elastic support, and the driving unit of FIG. 2;

FIG. 4 is a partially exploded perspective view showing the structure of the first axis, the second axis, and the elastic support of FIG. 3;

FIG. 5 is a partial cross-sectional view showing the structure of the first axis, the second axis, and the elastic support of FIG. 4;

As shown in these figures, an electric motor-driven steering apparatus 200 of an automobile according to an embodiment of the present invention is connected to a steering shaft 135 to receive a rotational force of a steering wheel 110, and a torque sensor 201 A second shaft 207 coupled to the first shaft 203 through a torsion bar 205; The other end of the elastic support 230 is coupled to the inner circumferential surface of the rack housing 211 which surrounds the second shaft 207 and the other end is coupled to the second shaft 207 to provide an elastic force when the second shaft 207 rotates. ); And a pinion gear 253 which is provided in the rack housing 211 and meshed with a rack gear 251 formed on a rack bar 290 that moves linearly, a motor 255 that provides a rotational driving force to the pinion gear 253, A steering angle sensor 115 for sensing the rotation angle of the torque sensor 201 and the steering shaft 135 and a controller 257 for receiving a signal from the vehicle speed sensor 125 and controlling the motor 255. [ ).

The steering shaft 135 is connected to the steering wheel 110 so that when the driver rotates the steering wheel 110, the steering shaft 135 rotates in conjunction with the steering shaft 135. The steering shaft 135 is provided with a steering angle sensor 115 The rotation angle of the driver's steering wheel 110 is sensed by the steering angle sensor 115 and transmitted to the control unit 257. [

The first shaft 203 is connected to the steering shaft 135 and receives the rotational force of the steering wheel 110.

The torque sensor 201 is provided on the first shaft 203 so that when the driver operates the steering wheel 110, the rotational direction of the first shaft 203 rotating in conjunction with the steering wheel 110 and the torque value And transmits the detection result to the control unit 257.

A bearing 305 supported on the inner circumferential surface of the rack housing 211 is coupled to the outer circumferential side of the torque sensor 201 on the first shaft 203. The bearing 305 may be a ball bearing.

A seal member 307 is coupled to the outer circumferential side of the first shaft 203 on the upper side of the bearing 305 to prevent moisture, foreign matter, and the like from penetrating.

The second shaft 207 is connected to the first shaft 203 via the torsion bar 205 and receives the rotational force of the steering wheel 110 transmitted to the first shaft 203. The second shaft 207 A bearing 301 supported on the inner circumferential surface of the rack housing 211 is coupled to the outer circumferential side of the first shaft 203 in the opposite direction to the first shaft 203. The bearing 301 may be a ball bearing .

A bearing 303 supported on the inner circumferential surface of the rack housing 211 is also coupled to the outer circumferential side of the second shaft 207 opposite to the portion where the bearing 301 is engaged. The bearing 303 is, for example, Bearing.

The elastic supporter 230 is coupled to the inner circumferential surface of the rack housing 211 having one end wrapped around the second shaft 207 and the other end is coupled to the second shaft 207, The other end of the elastic supporter 230 may be inserted and coupled to the coupling groove 401 formed in the second shaft 207. Although not shown in the drawing, the elastic supporter 230 May also be inserted and fixed in a groove formed in the inner circumferential surface of the rack housing 211.

The elastic support 230 may be provided as a torsion spring and the elasticity of the elastic support 230 may be greater than the torsional rigidity of the torsion bar 205, The rigidity of the elastic supporter 230 can be adjusted by changing the number of turns of the torsion spring, the direction, the thickness, and the like.

Therefore, when the driver rotates the steering wheel 110, a relative rotation is generated between the first shaft 203 and the second shaft 207, which causes the torsion bar 205 to twist, 201 are generated within the normal range.

The driving unit 250 includes a pinion gear 253 provided in the rack housing 211 and engaged with a rack gear 251 formed on a rack bar 290 that moves linearly, a motor 252 for providing a rotational driving force to the pinion gear 253 A steering angle sensor 115 for sensing the rotation angle of the torque sensor 201 and the steering shaft 135 and a control unit 257 for receiving a signal from the vehicle speed sensor 125 and controlling the motor 255 .

The driving unit 250 having such a configuration performs a role of linearly moving the rack bar 290 by providing a steering force to the rack bar 290. This is because the second pinion gear 170, The second rack gear 180, the ECU 130, the driving unit 140, and the like.

1, the driving unit 140 provides the steering assist force to the rack bar 190. However, in the embodiment of the present invention, the driving unit 250 provides the steering force to the rack bar 190 .

An operation example of an electric motor-driven steering apparatus according to an embodiment of the present invention will be described with reference to the drawings.

When the driver rotates the steering wheel 110, the steering shaft 135, the first shaft 203, and the second shaft 207 rotate together with the steering shaft. At this time, the first shaft 203 and the second shaft 207 are coupled through the torsion bar 205, and the other end of the second shaft 207 has a stiffness greater than the torsional rigidity of the torsion bar 205 A relative rotation is generated between the first shaft 203 and the second shaft 207 which causes the torsion bar 205 to twist and the torque sensor 201 To transmit to the controller 257 a signal that senses the rotational direction and the torque value of the steering wheel 110.

The vehicle speed sensor 125 detects whether the vehicle is stationary or running and transmits the detected driving speed to the control unit 257. The steering angle sensor 115 senses the angle at which the driver rotates the steering wheel 110 And transmits it to the controller 257.

The control unit 257 inputs inputs from the steering angle sensor 115, the vehicle speed sensor 125, the torque sensor 201, and the like as described above so as to enable steering of the wheels 145 corresponding to the driver's operation of the steering wheel 110 And controls the motor 255 based on the received signals to control the lateral movement amount of the rack bar 290.

As described above, according to the embodiment of the present invention, the steering force for holding the driver's steering feeling by the resilient force of the elastic supporter by coupling the elastic support to the second shaft, and for moving the rack bar linearly, , The steering structure can be simplified, the weight can be reduced, and the production cost can be reduced.

110: steering wheel 115: steering angle sensor
125: vehicle speed sensor 135: steering shaft
200: Electric motor-driven steering device of an automobile according to an embodiment of the present invention
201: torque sensor 203: first axis
205: Torsion bar 207: Second axis
211: rack housing 230: elastic support
250: driving part 251: rack gear
253: Pinion gear 255: Motor
257: control unit 290: rack bar

Claims (4)

A second shaft connected to the steering shaft to receive a rotational force of the steering wheel and coupled to a first shaft having a torque sensor via a torsion bar;
An elastic support having one end coupled to an inner circumferential surface of a rack housing surrounding the second shaft and the other end coupled to the second shaft to provide an elastic force when the second shaft rotates; And
A pinion gear provided in the rack housing and meshing with a rack gear formed on a rack bar moving linearly; a motor for providing a rotational driving force to the pinion gear; a steering angle sensor for sensing a rotation angle of the steering shaft; And a control unit for controlling the motor by receiving a signal from the driving unit.
And an electric power steering device for steering the electric motor. The method according to claim 1,
And a bearing supported on an inner circumferential surface of the rack housing is coupled to an outer circumferential side of the second shaft in a direction opposite to a portion coupled with the first shaft. 3. The method of claim 2,
And the other end of the elastic supporter is inserted and fixed in a coupling groove formed in the second shaft. 4. The method according to any one of claims 1 to 3,
Wherein the rigidity of the elastic support is greater than the torsional rigidity of the torsion bar.
KR1020130017889A 2013-02-20 2013-02-20 Electric Power Steering Apparatus for vehicle KR20140104133A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130017889A KR20140104133A (en) 2013-02-20 2013-02-20 Electric Power Steering Apparatus for vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130017889A KR20140104133A (en) 2013-02-20 2013-02-20 Electric Power Steering Apparatus for vehicle

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KR20140104133A true KR20140104133A (en) 2014-08-28

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KR1020130017889A KR20140104133A (en) 2013-02-20 2013-02-20 Electric Power Steering Apparatus for vehicle

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108137086A (en) * 2015-07-31 2018-06-08 捷太格特欧洲公司 Power steering gear with seal protection housing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108137086A (en) * 2015-07-31 2018-06-08 捷太格特欧洲公司 Power steering gear with seal protection housing
CN108137086B (en) * 2015-07-31 2020-10-30 捷太格特欧洲公司 Power steering apparatus with seal protection housing

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