KR101692233B1 - Electric Power Steering Apparatus - Google Patents

Electric Power Steering Apparatus Download PDF

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Publication number
KR101692233B1
KR101692233B1 KR1020150139537A KR20150139537A KR101692233B1 KR 101692233 B1 KR101692233 B1 KR 101692233B1 KR 1020150139537 A KR1020150139537 A KR 1020150139537A KR 20150139537 A KR20150139537 A KR 20150139537A KR 101692233 B1 KR101692233 B1 KR 101692233B1
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KR
South Korea
Prior art keywords
motor
motor shaft
pulley
coupled
protrusion
Prior art date
Application number
KR1020150139537A
Other languages
Korean (ko)
Inventor
이동현
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.)
Filing date
Publication date
Application filed by 주식회사 만도 filed Critical 주식회사 만도
Priority to KR1020150139537A priority Critical patent/KR101692233B1/en
Application granted granted Critical
Publication of KR101692233B1 publication Critical patent/KR101692233B1/en

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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
    • B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
    • B62D5/046—Controlling the motor
    • B62D5/0472—Controlling the motor for damping vibrations
    • 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
    • B62D5/0424—Electric motor acting on or near steering gear the axes of motor and final driven element of steering gear, e.g. rack, being parallel
    • 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
    • F16H55/32—Friction members
    • F16H55/36—Pulleys

Abstract

The present invention relates to a steering apparatus for assisting electric power, comprising: a motor shaft having a coupling portion formed to protrude from the outer circumference side in a radial direction; a motor pulley which is hollow and has an insertion groove with an inner circumferential side to which the coupling portion is coupled; and a damper which is coupled between the motor shaft and the motor pulley, and has a first protrusion formed in an extension portion extending in a radial direction in such a manner that surrounds the coupling portion, wherein the first protrusion is formed to bend outwardly or inwardly to be convex. Accordingly, the present invention is able to provide a steering apparatus for assisting electric power that a driver wants, so as to prevent damage to bearings that support a motor shaft to be rotatable in such a manner that an operating pulley is coupled to the motor shaft using a damper as a medium, and to remove a power loss in an electric motor.

Description

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

[0001] The present invention relates to an electric power assisted steering apparatus, and more particularly, to a motor-assisted power steering apparatus capable of preventing damage to a bearing that rotatably supports a motor shaft by coupling a motor pulley to a motor shaft via a damper ring, It is possible to provide a desired steering assist force of the driver and to prevent the rotational direction vibration of the motor shaft generated when the motor shaft is rotated by the motor from being transmitted to the motor pulley, as well as to prevent torque ripple The present invention relates to an electric power assisted steering apparatus capable of preventing booming generated due to ripple and torque ripple from being transmitted to a motor pulley as it is, thereby relieving fatigue and discomfort of a driver.

1 is a schematic configuration diagram of a conventional electric power assist steering apparatus. Figure 2 is a schematic cross-sectional view of part of Figure 1;

As shown in these figures, a conventional electric power assist steering apparatus includes an electronic control unit (Electronic Control Unit) for determining the degree of steering of the steering wheel 113 via a torque sensor 111 mounted on a steering column 110, Driving means (120) controlled by the ECU to generate power; A rack bar (130) for moving the tie rod (133) connected to the wheel (131) according to the degree of steering of the steering wheel (113); And a driving means 140 for receiving the rotational force of the driving means 120 and converting the rotational force into an axial movement force and delivering the rotational force to the rack bar 130.

Here, as shown in Fig. 2, the driving means 120 includes an electric motor 210 controlled by an electronic control unit (ECU); A drive pulley 211 fixed to the motor shaft 212 of the electric motor 210; And a drive belt 213 wound around the drive pulley 211.

The follower means 140 includes a ball nut 230 for supporting the rack bar 130 in the rack housing 220 surrounding the rack bar 130 and a driven pulley 240 Is assembled and formed.

The drive pulley 211 connected to the motor shaft 212 of the electric motor 210 and the driven pulley 240 coupled to the ball nut 230 are disposed in parallel to each other, and the drive pulley 211, the driven pulley 240, The drive belt 213 is inserted to transmit the rotational force of the electric motor 210 to the rack bar 130 and the rack bar 130 is moved to the left and right by the operation of the ball nut 230 to generate an assist force .

The ball nut 230 has an inner circumferential surface formed with a spiral inner circumferential helical groove and an outer circumferential surface of the rack bar 130 formed with a spiral outer circumferential helical groove. The ball is inserted.

A ball screw 230 is coupled to one side of the ball nut 230 and a ball bearing 250 is coupled to the other side of the ball nut 230 to support the ball nut 230.

A motor shaft 212 is rotatably coupled to the electric motor 210 through a bearing (not shown), and a driving pulley 211 is press-fitted to an end of the motor shaft 212.

However, as described above, the drive pulley in the conventional electric power assist steering apparatus of this structure is press-fitted into the motor shaft of the electric motor so that the bearing supporting the rotation of the motor shaft is damaged to generate power loss of the motor, There has been a problem that an auxiliary force can not be provided.

In addition, when the motor shaft is rotated in the electric motor, not only the rotational direction vibration of the motor shaft is generated but also a sudden change in torque occurs. Such boom caused by the torque ripple and torque ripple is transmitted to the drive pulley as it is, Causing fatigue and discomfort.

SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and it is an object of the present invention to provide a motor control apparatus and a motor control apparatus, which can prevent damage to bearings that support a motor shaft rotatably by coupling a drive pulley to a motor shaft via a damper ring, The present invention provides an electric power assist steering apparatus capable of providing auxiliary power.

In addition, not only the rotation direction vibration of the motor shaft generated when the motor shaft is rotated by the electric motor can be prevented from being transmitted to the motor pulley, but also the torque ripple due to the rapid torque fluctuation and the boom generated by the torque ripple And it is an object of the present invention to provide an electric power assist steering apparatus which can prevent a driver from being directly transmitted to a drive pulley and thereby relieve fatigue and discomfort of a driver.

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 the present invention, there is provided an electric motor comprising: a motor shaft having a coupling portion protruding radially from an outer circumferential surface; a motor pulley having a hollow shape and having an insertion groove into which an engagement portion is coupled to an inner circumferential surface; And a damper ring having a first projection protruding outwardly or inwardly convexly on an extension portion extending in the radial direction of the vehicle.

According to the present invention, the motor pulley is coupled to the motor shaft via the damper ring to prevent damage to bearings that support the motor shaft in a rotatable manner, and it is possible to eliminate the power loss of the motor and provide a steering assist force desired by the driver There is an effect that can be.

In addition, not only the rotation direction vibration of the motor shaft generated when the motor shaft is rotated by the motor can be blocked so as not to be transmitted to the motor pulley, but also the torque ripple and the torque ripple, It is possible to prevent the pulley from being directly transmitted to the pulley, thereby relieving fatigue and discomfort of the driver.

1 is a schematic view of a conventional electric power assist steering apparatus;
Figure 2 is a schematic cross-sectional view of a portion of Figure 1;
3 is a side view of a part of an electric power assisted steering apparatus according to an embodiment of the present invention;
Figure 4 is an enlarged view of a portion of Figure 3; And
5 to 7 are perspective views of a damper ring of an electric power assisted steering apparatus according to various embodiments of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if 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 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."

FIG. 3 is a side view of a portion of an electric power assisted steering apparatus according to an embodiment of the present invention, FIG. 4 is an enlarged view of a portion of FIG. 3, and FIGS. 5-7 illustrate various embodiments of the present invention Fig. 2 is a perspective view of a damper ring of an electric power assist steering device.

2 and FIG. 3, the electric power assisted steering apparatus according to the present invention includes a motor shaft 313 having a coupling portion 311 protruding radially from the outer circumferential surface thereof, a hollow shaft 313 having a hollow shape, A motor pulley 330 having an insertion groove 331 to which the motor shaft 311 is coupled and a motor shaft 313 coupled to the motor pulley 330, And a damper ring 350 having a first protrusion 453 bended outwardly or inwardly in a convex shape.

The electric power assisted steering apparatus includes a drive belt 303 coupled to a motor pulley 330 rotating with a motor shaft 313 to rotate the nut pulley 302 and a nut pulley 302 coupled to the rack bar 304, When the motor 310 is driven by the electronic control unit, the drive belt 303 transmits the rotational force to rotate the ball nut 305, so that the rack bar 304 ) Are slid to the left and right to assist the steering force of the driver.

The motor shaft 313 is rotatably supported by the motor housing, that is, the motor shaft 313 is rotatably supported by bearings (see 290 in Fig. 2) provided in the motor housing.

One end portion of the motor shaft 313 is provided with an engaging portion 311 protruding radially from the outer circumferential surface of the motor shaft 313. The engaging portion 311 is inserted into the insertion groove 331 of the motor pulley 330 and coupled thereto.

A plurality of coupling portions 311 may be provided on the outer circumferential surface of the motor shaft 313.

The motor pulley 330 is hollow and has a serration 415 for engaging the drive belt 303 on the outer circumferential surface and has an insertion groove 331 formed in the inner circumferential surface thereof in a shape corresponding to the engaging portion 311.

A plurality of insertion grooves 331 may be provided on the inner circumferential surface of the motor pulley 330 at positions corresponding to the coupling portions 311. When the coupling portions 311 are coupled to the insertion grooves 331, It is possible to prevent the bearing 290, which is coupled to the motor housing and supports the rotation of the motor shaft 313, from being damaged.

In the present invention, as shown in the drawing, the coupling portion 311 and the insertion groove 331 are provided at four positions spaced apart from one another in the circumferential direction.

A damper ring 350 is coupled between the motor shaft 313 and the motor pulley 330 to connect the outer circumferential surface of the motor shaft 313 and the inner circumferential surface of the motor pulley 330 and between the engaging portion 311 and the insertion groove 331 Thereby reducing the torque ripple and the booming generated when the motor 310 is driven.

The damper ring 350 is provided with an extension 451 extending in the radial direction so as to surround the coupling portion 311 of the motor shaft 313 so that the extension portion 451 is engaged with the coupling portion 311 and the insertion groove 331, Respectively.

The extension portion 451 is provided with a first protrusion 453 formed to bend outwardly convexly.

The first protrusion 453 supports between the coupling portion 311 and the insertion groove 331 and supports the coupling portion 311 and the insertion groove 331 after being coupled in a compressed state at the time of coupling, .

The damper ring 350 is made of a steel material, for example, a spring steel plate, a spring stainless steel plate, or the like, and reduces torque ripple generated in the motor shaft 313.

It is possible to prevent the bearing 290 which rotatably supports the motor shaft 313 from being damaged by pushing the motor pulley 330 into the conventional motor shaft 313 and the motor shaft 313 and the motor pulley The damper ring 350 is coupled between the motor 310 and the motor 310 to prevent the torque ripple and the boom generated in the motor 310.

Here, the torque ripple is a vibration that is generated periodically at a high level due to a kind of torque imbalance, and the boom is a resonance that oscillates when such vibration is transmitted.

The protruding amount of the second protruding portion 455 is less than the protruding amount of the protruding portion of the first protruding portion 453. The protruding amount of the second protruding portion 455 So that the first protrusion 453 is supported between the motor shaft 313 and the motor pulley 330.

At this time, when the first protrusion 453 is compressed to some extent due to the vibration generated in the motor 310, the second protrusion 455 supports between the motor shaft 313 and the motor pulley 330.

As the first protrusion 453 is compressed and the first protrusion 453 and the second protrusion 455 support between the motor shaft 313 and the motor pulley 330, torque ripples and / It is possible to shut off the transmission to the motor pulley 330, that is, to block the higher frequency generated by the motor 310.

4, the first protrusions 453 protrude from the second protrusions 455 by an amount of protrusion A so that the first protrusions 453 protrude from the motor shaft 313 and the motor pulley 452. In other words, The first protrusions 453 are compressed and the second protrusions 455 abut against the motor shaft 313 and the motor pulley 330 when the torque ripple is generated from the motor 310 .

The first protrusions 453 and the second protrusions 455 are simultaneously pressed between the motor shaft 313 and the motor pulley 330 when the second protrusions 455 abut against the motor shaft 313 and the motor pulley 330. [ And support it with greater rigidity.

Here, the specific frequency of the torque ripple can be cut off according to the magnitude of the supporting force between the motor shaft 313 and the motor pulley 330, which is adjusted according to the rigidity of the damper ring 350. The first protrusion 453, The supporting force between the motor shaft 313 and the motor pulley 330 increases as the first protrusion 453 and the second protrusion 455 support the motor shaft 313 and the motor pulley 330 It is possible to cut off other frequencies.

Simultaneously, the first protrusions 453 and the second protrusions 455 simultaneously support the motor shaft 313 and the motor pulley 330, thereby reducing the vibration generated in the motor shaft 313, As shown in FIG.

5, the first protrusions 453 and the second protrusions 455 of the damper ring 350a according to another embodiment may be bent convexly inward of the extended portion 451, The extension portion 451 extends in the radial direction along the insertion groove 331 of the motor pulley 330 and the first protrusion 453 bent to the inside of the extension portion 451 conveys the motor shaft 313 .

The amount of protrusion of the first protrusion 453 is larger than the protrusion of the second protrusion 455 so that the first protrusion 453 supports between the motor shaft 313 and the motor pulley 330, The first protrusions 453 and the second protrusions 455 support the motor shaft 313 and the motor pulley 330 at the same time to block a specific frequency generated during torque ripple, So that the vibration can be reduced and the booming generated due to the torque ripple can be cut off.

6, the extended portion 451 of the damper ring 350b according to another embodiment includes a first support portion 657 that is further projected radially from the end.

The first support portion 657 reduces the radial vibration of the motor shaft 313 and the motor pulley 330 so that the motor shaft 313 rotates together with the motor pulley 330, The first support portion 657 reduces the radial vibration of the motor shaft 313 and the motor pulley 330 generated at this time by driving the drive belt 303 coupled to the motor 415. [

7, a second support portion 759 protruding from the outer circumferential surface between the extended portions 451 of the damper ring 350c according to another embodiment is provided.

A second support portion is formed to protrude from the outer circumferential surface between the extension portions 451 formed apart from the damper ring 350c so that the second support portion 759 stably supports the outer circumferential surface of the motor shaft 313 and the inner circumferential surface of the motor pulley 330 So that the rotational force can be transmitted from the motor shaft 313 to the motor pulley 330 as it is.

According to the embodiments of the present invention having such a shape and structure, the motor pulley is coupled to the motor shaft via the damper ring to prevent damage to the bearing that rotatably supports the motor shaft, So that it is possible to provide a desired steering assist force of the engine.

In addition, not only the rotation direction vibration of the motor shaft generated when the motor shaft is rotated by the motor can be blocked so as not to be transmitted to the motor pulley, but also the torque ripple and the torque ripple, It is possible to prevent the pulley from being directly transmitted to the pulley, thereby relieving fatigue and discomfort of the driver.

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. 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 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.

301: housing 302: nut pulley
303: driving belt 304: rack bar
305: ball nut 310: motor
311: engaging portion 313: motor shaft
330: motor pulley 331: insertion groove
350, 350a, 350b, 350c: damper ring
415: Serration 451: Extension
453: first protrusion 455: second protrusion
657: first support portion 759: second support portion

Claims (5)

A motor shaft having a coupling portion protruding radially from an outer circumferential surface;
A motor pulley having a hollow shape and provided with an insertion groove into which the coupling portion is coupled to an inner peripheral surface; And
And a damper ring coupled between the motor shaft and the motor pulley and having a first protrusion and a second protrusion bent outwardly or inwardly convexly in an extension extending in a radial direction to enclose the coupling,
The projecting amount of the first projecting portion is formed to be larger than the projecting amount of the second projecting portion so that the second projecting portion is spaced apart from the insertion groove or the engaging portion,
Only the first protrusions normally support between the engaging portions and the inserting grooves to cut off a specific frequency of the motor, and when the first protrusions are compressed, the first protrusions and the second protrusions simultaneously move between the engaging portions and the inserting grooves To cut off frequencies higher than the specific frequency. delete The method according to claim 1,
Wherein the extended portion is provided with a first support portion protruding radially from an end thereof. The method according to claim 1,
Wherein the damper ring includes a second support portion protruding from an outer circumferential surface between the extended portions. The method according to claim 1,
Wherein the coupling portion and the insertion groove are spaced apart from each other in the circumferential direction of the motor shaft and the motor pulley.
KR1020150139537A 2015-10-05 2015-10-05 Electric Power Steering Apparatus KR101692233B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150139537A KR101692233B1 (en) 2015-10-05 2015-10-05 Electric Power Steering Apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150139537A KR101692233B1 (en) 2015-10-05 2015-10-05 Electric Power Steering Apparatus

Publications (1)

Publication Number Publication Date
KR101692233B1 true KR101692233B1 (en) 2017-01-03

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KR1020150139537A KR101692233B1 (en) 2015-10-05 2015-10-05 Electric Power Steering Apparatus

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112407031A (en) * 2019-08-23 2021-02-26 株式会社万都 Electric power steering gear and vehicle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006234115A (en) * 2005-02-25 2006-09-07 Fuji Kiko Co Ltd Pulley
JP2007161165A (en) * 2005-12-15 2007-06-28 Nsk Ltd Power transmission mechanism and electric power steering device installing the mechanism
JP2008025656A (en) * 2006-07-19 2008-02-07 Ntn Corp Outer ring for fixed type constant velocity joint

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006234115A (en) * 2005-02-25 2006-09-07 Fuji Kiko Co Ltd Pulley
JP2007161165A (en) * 2005-12-15 2007-06-28 Nsk Ltd Power transmission mechanism and electric power steering device installing the mechanism
JP2008025656A (en) * 2006-07-19 2008-02-07 Ntn Corp Outer ring for fixed type constant velocity joint

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112407031A (en) * 2019-08-23 2021-02-26 株式会社万都 Electric power steering gear and vehicle

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