KR20140037445A - Power transmission device of electric power steering apparatus - Google Patents

Power transmission device of electric power steering apparatus Download PDF

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Publication number
KR20140037445A
KR20140037445A KR1020120103483A KR20120103483A KR20140037445A KR 20140037445 A KR20140037445 A KR 20140037445A KR 1020120103483 A KR1020120103483 A KR 1020120103483A KR 20120103483 A KR20120103483 A KR 20120103483A KR 20140037445 A KR20140037445 A KR 20140037445A
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KR
South Korea
Prior art keywords
steering
coupled
coupling
power
shaft
Prior art date
Application number
KR1020120103483A
Other languages
Korean (ko)
Other versions
KR101393253B1 (en
Inventor
김흥주
Original Assignee
주식회사 만도
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Publication date
Application filed by 주식회사 만도 filed Critical 주식회사 만도
Priority to KR1020120103483A priority Critical patent/KR101393253B1/en
Publication of KR20140037445A publication Critical patent/KR20140037445A/en
Application granted granted Critical
Publication of KR101393253B1 publication Critical patent/KR101393253B1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D5/00Power-assisted or power-driven steering
    • B62D5/04Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0409Electric motor acting on the steering column
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D5/00Power-assisted or power-driven steering
    • B62D5/04Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0442Conversion of rotational into longitudinal movement
    • B62D5/0454Worm gears
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60YINDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2304/00Optimising design; Manufacturing; Testing
    • B60Y2304/05Reducing production costs, e.g. by redesign
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60YINDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00Other features of vehicle sub-units
    • B60Y2306/09Reducing noise
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60YINDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00Special features of vehicle units
    • B60Y2400/40Actuators for moving a controlled member
    • B60Y2400/405Electric motors actuators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60YINDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00Special features of vehicle units
    • B60Y2400/40Actuators for moving a controlled member
    • B60Y2400/418Power assistance, e.g. servo-motors
    • B60Y2400/4187Servo-motors, e.g. electric or fluidic with feedback control

Abstract

The present invention relates to a power transmitting member of an electric power steering apparatus and, in comparison with a power transmitting member of a conventional electric power steering apparatus, noise caused by a clearance between an inner rotor and an outer rotor can be eliminated, It is possible to reduce the manufacturing process, reduce the cost, and prevent the noise due to the tilting and vibration when the power is transmitted.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power transmission device for an electric power steering apparatus,
The present invention relates to a power transmitting member of an electric steering system. More specifically, noise caused by the clearance between the inner rotor and the outer rotor can be eliminated as compared with the power transmitting member of the conventional electric steering type steering apparatus. By sharing the parts coupled with the drive shaft and the driven shaft, To a power transmission member of an electric power steering system capable of preventing noise caused by tilting and vibration when power is transmitted.
A steering apparatus of a vehicle is a device that allows a driver to freely change the traveling direction of a vehicle by turning a steering wheel and arbitrarily changing the turning center of the front wheel of the vehicle to assist the driver in moving the vehicle in a desired direction Device. A power steering system is used as an auxiliary power mechanism to relieve the driver of such a steering apparatus. This power assist steering apparatus mainly employs the power of the engine to operate the hydraulic pump to assist steering force A hydraulic power assist steering device using hydraulic pressure, and an electric power assist steering device using an electric motor.
The hydraulic power assist steering device detects the rotation of the steering wheel, receives the rotational force from the engine, operates the hydraulic pump, and sends the hydraulic pressure to a drive unit such as a cylinder configured on the rack bar or the steering shaft to assist the driver in steering effort.
The electric power assisted steering apparatus has a structure for sensing the rotation of the steering wheel and being installed on a rack or a steering shaft so as to operate the motor for facilitating the turning motion so as to smoothly operate the steering apparatus. (R-EPS) and steering shaft drive type (C-EPS).
1 is a schematic diagram of a conventional electric power assisted steering device.
1, the electric power assist steering apparatus includes a steering system 100 extending from a steering wheel 101 to both wheels 108 and an auxiliary power mechanism 120 for providing a steering assist power to the steering system 100. [ .
The steering system 100 includes a steering shaft 102 having one side connected to the steering wheel 101 and rotating together with the steering wheel 101 and the other side connected to the pinion shaft 104 via a pair of universal joints 103 ). The pinion shaft 104 is connected to the rack bar via the rack-and-pinion mechanism unit 105 and both ends of the rack bar are connected to the wheel 108 of the vehicle through the tie rod 106 and the knuckle arm 107. Since the rack-and-pinion mechanism portion 105 is formed by interlocking the pinion gear 111 formed on the pinion shaft 104 and the rack gear 112 formed on one side of the outer surface of the rack bar, A torque is generated in the steering system 100 and the wheels 108 are steered by the torque via the rack-pinion mechanism portion 105 and the tie rod 106.
The auxiliary power unit 120 includes a torque sensor 125 that senses a torque applied by the driver to the steering wheel 101 and outputs an electric signal proportional to the sensed torque, A motor 130 for generating an auxiliary power based on a signal transmitted from the electronic control unit and a speed reducer for transmitting an auxiliary power generated in the motor to the steering shaft 102 140).
2 is a sectional view showing a power transmitting member of a conventional electric power steering apparatus.
2, the power transmitting member of the electric power steering apparatus includes a motor 130, a drive shaft 205, an inner rotor 220, an outer rotor 215, an elastic body 210, a first bearing 250, A compression spring 255, a compression spring 265, and a gear housing 260. The gear housing 260 includes a gear housing 235, a worm gear 245, a second bearing 270, a compression screw 255,
The motor 130 has a drive shaft 205 extending to the outside of the motor housing, and the outer rotor 215 is connected to the drive shaft 215 at one side thereof in a hollow state. The second bearing 270 and the first bearing 250 fix the worm gear 245 to the worm wheel gear 240 provided on the steering shaft. The compression spring 265 supports the worm gear 245 in the direction of the worm wheel 240 by the compression screw 255 and supports the second bearing 270. Therefore, when the compression screw 255 is pushed, the compression screw 255 moves and the compression spring 265 contracts. As a result, the worm gear 245 is firmly fixed to the worm wheel 240 by the compression force of the compression spring 265 So that it can be bitten.
The inner rotor 220 is connected to the worm shaft 235. The inner rotor 220 has a structure in which one side of the inner rotor 220 is inserted into the outer rotor 215 connected to the drive shaft 205.
However, the power transmitting member of such a conventional electric power steering apparatus has a structure in which the inner rotor and the outer rotor are simply press-fitted to each other and the inner side of the inner rotor and the outer side of the rotor are in direct contact with each other. There is a problem that wear and noise of a clearance due to contact are undesirably affected by a large impact applied to the steering shaft.
Further, there is a problem in that a process of assembling the inner rotor and the outer rotor and a process of applying the grease therebetween are required, thereby increasing the number of assembling steps and increasing the cost.
Accordingly, the present invention has been made in view of the above-mentioned background, and it is an object of the present invention to provide a power transmitting member of a conventional electric steering type steering apparatus capable of eliminating noise due to clearance between an inner rotor and an outer rotor, Thereby reducing the manufacturing process and reducing the cost, and preventing the noise due to the tilting and vibration during power transmission.
In order to accomplish the above object, the present invention provides a coaxial coupling device for coaxial coupling of a drive shaft and a driven shaft, wherein at least one support portion protruding in the axial direction, which is coupled to the drive shaft and the driven shaft, A pair of coupling members; And a coupling member coupled between the coupling members and protruding radially from the outer circumferential side to have protrusions coupled between the circumferential directions of the respective support members of the coupling members, to provide.
According to the present invention, the noise due to the clearance between the inner rotor and the outer rotor can be eliminated as compared with the power transmitting member of the conventional electric power steering apparatus, and the parts that are coupled to the drive shaft and the driven shaft are shared, It is possible to reduce the cost and to prevent the noise due to the tilting and vibration when the power is transmitted.
1 is a schematic view of a conventional electric power steering apparatus,
2 is a sectional view showing a power transmitting member of a conventional electric power steering apparatus,
3 is a perspective view showing a state in which a power transmitting member of an electric power steering apparatus according to the present invention is engaged.
4 is an exploded perspective view showing a power transmitting member of an electric power steering apparatus according to the present invention,
5 is a cross-sectional view showing a power transmitting member of an electric power steering apparatus according to the present invention.
Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings.
FIG. 3 is an exploded perspective view showing the power transmitting member of the electric power steering apparatus according to the present invention, FIG. 5 is a perspective view showing the electric power steering member according to the present invention, Sectional view showing a power transmitting member of the apparatus.
As shown in these figures, the power transmitting member 300 of the electric power steering apparatus according to the present invention coaxially connects the drive shaft 303 and the driven shaft 305 to transmit the power, A pair of coupling members 310 each of which is coupled to the driven shaft 305 and has at least one support portion 313 protruding in the axial direction and facing each other; And a protrusion 321 coupled between the coupling members 310 and protruding radially from the outer circumferential side to be coupled between the circumferential directions of the supporting portions 313 of the coupling members 310, (320).
The power transmitting member 300 is connected to a power source such as a motor or a pump and is coaxially connected to a rotating driving shaft 303 to transmit rotational force from the power source to the driven shaft 305. In the detailed description of the present invention, And a worm shaft is used as the driven shaft 305 will be described as an example.
In this case, in this case, the power transmitting member 300 connects the motor shaft that generates the auxiliary power of the electric steering apparatus with the worm shaft, and transmits the auxiliary power generated by the motor to the steering shaft (not shown) So as to assist the steering force of the driver.
The coupling member 310 is coupled to the driving shaft 303 and the driven shaft 305 so that the power transmitting member 300 coaxially connects the driving shaft 303 and the driven shaft 305 and transmits the power. A coupling member 320 is coupled between the coupling members 310.
At least one supporting portion 313 protruding in the axial direction opposite to each other with the connecting member 320 interposed therebetween is formed, and the connecting member 320 formed in a pair And the supporting portions 313 are engaged with each other in the circumferential direction when the coupling members 310 are engaged.
The coupling member 310 is provided with a cylindrical coupling portion 311 extending inwardly and outwardly from the central portion of a plate-shaped body 317. The coupling portion 311 is provided with a driving shaft 303 or a driven shaft 305 are coupled to each other.
The inner circumferential surface of the through hole 315 is coupled with the driving shaft 303 or the driven shaft 305 to provide serration formed in the axial direction in order to prevent the inner circumferential surface of the through hole 315 from being torn or separated during rotation.
The support portion 313 is located at the outer periphery of the body 317 of the coupling member 310 and protrudes in the axial direction and has a predetermined thickness toward the central portion of the body 317, The supporting portion 313 of the engaging member 310a coupled with the driving shaft 303 rotates to the supporting portion 313 of the engaging member 310b engaged with the driven shaft 305 via the connecting member 320 So that the rigidity can be maintained firmly.
The coupling member 320 is coupled between the axial direction of the coupling member 310 and includes a protrusion 321 protruding radially from the outer periphery of the coupling member 310 so that the support portions 313 In the circumferential direction.
However, in the drawings and detailed description of the present invention, two supporting portions 313 of the coupling member 310 are provided and four protrusions 321 of the coupling member 320 are formed. However, The number of the protrusions 321 is twice as many as the number of the supports 313. In the case where one support 313 is formed, the protrusions 321 are also formed in the present invention. .
The connection member 320 is formed with a fastening hole 327 so that the fastening portion 311 formed at the inner side of the fastening member 310 can be coupled and fixed to the center of the body 323 formed into a cylindrical shape.
The connecting member 320 may be made of a metal or an engineering plastic such as polyacetal (POM), polyamide (PA), polycarbonate (PC), polyimide (PI), polybutylene terephthalate Or the like.
The projection 321 protruding radially from the outer circumference of the body 323 of the connection member 320 is spaced apart from the support 313 of the coupling member 310 in the circumferential direction, So that the assembling member 310 can be assembled easily.
A damping member 325 is coupled between the outer circumferential end of the protrusion 321 and the body of the connection member 320. The protrusion 321 does not directly contact the support 313 and the damping member 325 So that it is in contact with the supporting portion 313 and is coupled to absorb noise due to contact or impact.
The damping member 325 is formed in a closed band or ring shape and can form a groove (not shown) between the outer circumferential end of the protrusion 321 and the body of the connecting member 320 and can be coupled to the groove.
The damping member 325 may be made of a material such as natural rubber (NR), nitrile butadiene rubber (NBR), chloroprene rubber (CR), ethylene propylene terpolymer (EPDM) (Styrene Butadine Rubber), Chlorosulphonated Polyethylene (CSM), Urethane, Silicone, etc., and acts as a damping for absorbing noise and vibration.
The damping member 325 elastically deforms between the protruding portion 321 of the connecting member 320 and the supporting portion 313 of the engaging member 310 when the connecting member 320 and the engaging member 310 are engaged, Thereby preventing the assembly failure in which the damping member 325 is pushed or released to either side.
The amount of the damping member 325 to be pressed is approximately 20 to 30% of the diameter of the damping member 325. When the pressing amount of the damping member is less than 20%, the noise is greater than 40 dB, The amount of shaking of the steering wheel is increased at the same time when the steering wheel is tilted. When the tilting amount of the steering wheel is greater than 30%, the coupling member 320 and the coupling member 310 are difficult to be coupled with each other. The amount of shaking increases.
According to the present invention having such a structure and configuration, it is possible to eliminate the noise due to the clearance between the inner rotor and the outer rotor compared with the power transmitting member of the conventional electric type steering apparatus, and to share the parts coupled with the drive shaft and the driven shaft The manufacturing process can be reduced, the cost can be reduced, and noise caused by the tilting and vibration during power transmission can be prevented.
300: power transmitting member 303: drive shaft
305: follower shaft 310: coupling member
311: fastening part 313:
315: Through hole 317: Body
320: connecting member 321:
323: body 325: damping member
327: fastening hole

Claims (7)

  1. By coaxially connecting the drive shaft and the driven shaft and transmitting the power,
    A pair of coupling members each having at least one support portion protruding in the axial direction, the pair of coupling members being respectively coupled to the drive shaft and the driven shaft and opposed to each other;
    A coupling member coupled between the coupling members and having a protrusion formed radially protruding from an outer circumferential side and coupled between a circumferential direction of a support of each coupling member;
    Power transmission member of the electric steering apparatus comprising a.
  2. The method of claim 1,
    The coupling member is provided with a fastening portion extending inwardly and outwardly in the center of the plate-shaped body, the fastening portion is a power transmission member of the electric steering apparatus, characterized in that the through-hole is formed is coupled to the drive shaft or driven shaft.
  3. 3. The method of claim 2,
    The support portion is located on the outer portion of the body and the power transmission member of the electric steering apparatus, characterized in that it has a predetermined thickness toward the center of the body.
  4. The method of claim 1,
    The connection member is a power transmission member of the electric steering apparatus, characterized in that the coupling hole is formed in the center of the cylindrical body is coupled to the coupling portion formed inside the coupling member.
  5. 5. The method of claim 4,
    The protrusion is formed on the outer circumferential side of the body, the power transmission member of the electric steering apparatus, characterized in that formed spaced apart by a predetermined interval in the circumferential direction with the support.
  6. The method of claim 5, wherein
    Wherein a damping member is coupled between the outer circumferential end of the protrusion and the body of the connecting member, and the power transmitting member is in contact with and coupled to the supporting portion.
  7. The method according to claim 6,
    Wherein the damping member is formed of an elastic material and elastically deformed and coupled between the protrusion and the support portion.
KR1020120103483A 2012-09-18 2012-09-18 Power Transmission Device of Electric Power Steering Apparatus KR101393253B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120103483A KR101393253B1 (en) 2012-09-18 2012-09-18 Power Transmission Device of Electric Power Steering Apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120103483A KR101393253B1 (en) 2012-09-18 2012-09-18 Power Transmission Device of Electric Power Steering Apparatus

Publications (2)

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KR20140037445A true KR20140037445A (en) 2014-03-27
KR101393253B1 KR101393253B1 (en) 2014-05-08

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150123532A (en) * 2014-04-25 2015-11-04 한국델파이주식회사 Motor coupling for electric power steering apparatus
KR20160011267A (en) * 2014-07-21 2016-02-01 현대모비스 주식회사 Motor driven power steering system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005212622A (en) 2004-01-29 2005-08-11 Favess Co Ltd Electric power steering device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150123532A (en) * 2014-04-25 2015-11-04 한국델파이주식회사 Motor coupling for electric power steering apparatus
KR20160011267A (en) * 2014-07-21 2016-02-01 현대모비스 주식회사 Motor driven power steering system

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Publication number Publication date
KR101393253B1 (en) 2014-05-08

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