KR20140014714A - Noise reduction type motor driven power steering - Google Patents

Noise reduction type motor driven power steering Download PDF

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Publication number
KR20140014714A
KR20140014714A KR1020120081414A KR20120081414A KR20140014714A KR 20140014714 A KR20140014714 A KR 20140014714A KR 1020120081414 A KR1020120081414 A KR 1020120081414A KR 20120081414 A KR20120081414 A KR 20120081414A KR 20140014714 A KR20140014714 A KR 20140014714A
Authority
KR
South Korea
Prior art keywords
ring
worm shaft
noise reduction
limiting
rotation
Prior art date
Application number
KR1020120081414A
Other languages
Korean (ko)
Inventor
이치호
Original Assignee
현대모비스 주식회사
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 현대모비스 주식회사 filed Critical 현대모비스 주식회사
Priority to KR1020120081414A priority Critical patent/KR20140014714A/en
Publication of KR20140014714A publication Critical patent/KR20140014714A/en

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Classifications

    • 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
    • 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
    • B60Y2410/00Constructional features of vehicle sub-units
    • B60Y2410/10Housings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H57/00General details of gearing
    • F16H57/02Gearboxes; Mounting gearing therein
    • F16H57/021Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H2057/0213Support of worm gear shafts

Abstract

A noise reduction type motor driven power steering device is disclosed. The noise reduction type motor driven power steering device includes a housing; a worm wheel gear inside the housing to be fixed to the outer side of a steering shaft; a worm shaft engaged with the worm wheel gear to be rotated; and a tilting direction limiting part which supports the worm shaft to be rotated and which limits the tilting direction of the worm shaft.

Description

Noise reduction type electric steering system {NOISE REDUCTION TYPE MOTOR DRIVEN POWER STEERING}
The present invention relates to a noise reduction type electric steering apparatus, and more particularly, to a noise reduction type electric steering apparatus which restricts the tilting direction of a worm shaft and prevents unnecessary tilting, thereby reducing noise generated in the electric steering apparatus. will be.
In general, the electric steering apparatus assists the driver's steering force by using the rotational force generated by the motor member when the driver's steering wheel is operated.
The worm wheel gear is integrally rotated on the outer circumference of the steering shaft connected to the handle, and the worm shaft is installed in contact with the worm wheel gear.
In the electric steering apparatus, when the electronic control apparatus drives the motor member according to the driving conditions of the vehicle detected by the vehicle speed sensor and the steering torque sensor, the motor member rotates the worm shaft.
Accordingly, the electric steering apparatus increases the steering assistance force so that the steering wheel handles lighter when the vehicle is running at low speed, while the steering assist force is reduced so that the steering wheel becomes heavy during high speed driving, thereby driving stability. do.
Background art of the present invention is disclosed in Republic of Korea Patent Publication No. 2011-0073004 (published on June 29, 2011, the name of the invention: the speed reducer of the electric power assist steering device and the electric power assist steering device using the same).
In the conventional electric steering apparatus, noise is generated when the worm shaft is tilted in an arbitrary direction inside the housing so that the gear engagement between the worm wheel gear and the worm shaft is displaced. Therefore, there is a need for improvement.
The present invention has been made by the necessity as described above, by limiting the tilting direction of the worm shaft, to provide a noise reduction type electric steering apparatus that can reduce the generation of noise due to the tilting of the worm shaft in any direction. There is this.
Noise reduction electric steering apparatus according to the present invention comprises: a housing; A worm wheel gear fixed to an outer side of the steering shaft in the housing; A worm shaft engaged with the worm wheel gear; And a tilting direction limitation part rotatably supporting the worm shaft and limiting a tilting direction of the worm shaft.
In the present invention, the tilting direction limiting portion includes an inner ring member having an inner hole through which the worm shaft is inserted; A plurality of sliding members installed outside the inner ring member to reduce friction; An outer ring member spaced apart from the inner ring member with the sliding member therebetween; A support part rotatably supporting the outer ring member at an inner side and fixed to the housing; And a rotation direction limiting part mounted between the support part and the outer ring member and restricting the outer ring member to rotate in a predetermined direction with respect to the support part.
In the present invention, the rotation direction limiting portion has a pin shape, with a central axis facing the worm shaft rotational axis, and each end portion is rotatably coupled to the outer ring member and the support portion.
In the present invention, the rotation direction limiting portion is mounted in a direction parallel to the rotation axis of the worm wheel gear.
In the present invention, the rotation direction limiting portion is provided with a pair symmetrically with respect to the rotation axis of the worm shaft.
The noise reduction type electric steering apparatus according to the present invention has the effect of reducing the noise caused by unnecessary tilting by limiting the tilting direction of the worm shaft.
In addition, the present invention allows only the tilting in the vertical direction to the rotation axis of the worm wheel gear, thereby reducing the noise by the tilting in any direction, and at the same time improves the gear meshing of the worm wheel gear and the worm shaft.
1 is a cross-sectional view schematically showing a noise reduction electric steering device according to an embodiment of the present invention.
2 is a view showing a cross section of the tilting direction limiter according to an embodiment of the present invention.
3 is a view showing the tilting direction of the worm shaft according to an embodiment of the present invention.
Hereinafter, with reference to the accompanying drawings will be described an embodiment of a noise reduction electric steering device according to the present invention. For convenience of explanation, the noise reduction electric steering apparatus used in a vehicle will be described as an example. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.
1 is a cross-sectional view schematically showing a noise reduction electric steering apparatus according to an embodiment of the present invention, Figure 2 is a view showing a cross section of the tilting direction limiting device according to an embodiment of the present invention.
As shown in Figures 1 to 2, the noise reduction electric steering apparatus according to an embodiment of the present invention (1), the housing 10, the inside of the housing 10, the outer side of the steering shaft (3) It includes a worm wheel gear 20, which is fixed to the worm wheel gear 20, the worm shaft 30 is engaged with the worm wheel gear 20 and the tilting direction limiting portion 40 for limiting the tilting direction of the worm shaft 30.
Since the worm wheel gear 20 is fixed to the outside of the steering shaft 3 connected to the handle, the worm wheel gear 20 rotates together with the steering shaft 3.
The worm shaft 30 engaged with the worm wheel gear 20 is connected to the rotation shaft of the motor member 5, and the worm shaft 30 rotates by the operation of the motor member 5.
The worm shaft 30 has a motor member 5 connected to one side (the left side of FIG. 1), and a pressure bearing 7 is installed on the other side (the right side of FIG. 1) of the worm shaft 30.
Since the pressure bearing 7 is pressurized by the coil spring 9 from the outside of the housing 10 to the other side, the worm shaft 30 located inside the pressure bearing 7 is worm wheel gear 20 (FIG. 1). To the bottom of the reference).
The tilting direction limiting part 40 for limiting the tilting direction of the worm shaft 30 may be configured in various ways within the scope of the technical idea of limiting the tilting direction of the worm shaft 30.
Tilting direction limiting portion 40 according to an embodiment of the present invention, the inner ring member 41 having an inner through-hole 42 into which the worm shaft 30 is inserted, the outer ring member 41 is installed outside the inner ring member 41 to reduce friction A plurality of sliding members 43 to be reduced, an outer ring member 45 spaced apart from the inner ring member 41 with the sliding member 43 therebetween, and the outer ring member 45 are rotatably supported from the inside, and the housing 10 And a rotation direction limiting part 49 for connecting the support 47 and the outer ring member 45 fixed to the support 47 to limit the rotational direction of the outer ring member 45 with respect to the support 47.
The inner ring member 41 having an inner through hole 42 into which the worm shaft 30 is inserted is provided at one side of the worm shaft 30 adjacent to the motor member 5. In this embodiment, the inner ring member 41 is based on a ring shape.
The sliding member 43 which is rotatably provided in the inner ring member 41 is provided in plurality, and is located between the inner ring member 41 and the outer ring member 45.
The sliding member 43 may be applied to various materials and shapes within a technical concept of reducing friction with the outer ring member 45 due to the rotation of the inner ring member 41.
In the present embodiment, the sliding member 43 is spherical in shape to reduce friction and is made of a metal material to prevent deformation and breakage of the shape with sufficient rigidity. The sliding member 43 is arranged symmetrically with respect to the worm shaft rotation shaft 31 so that the force transmitted from the worm shaft 30 can be uniformly distributed.
The outer ring member 45 is spaced apart from the inner ring member 41 with the sliding member 43 therebetween. In this embodiment, the outer ring member 45 is generally ring-shaped, the inner surface may be formed with a guide groove, etc. to guide the movement of the sliding member 43, the outer peripheral surface may be tilted together with the worm shaft 30 So that it is curved shape.
The support part 47 rotatably supporting the outer ring member 45 and fixed to the housing 10 is a ring shape surrounding the outer ring member 45 in this embodiment. The inner circumferential surface of the support 47 is curved in shape so that the outer ring member 45 can be tilted together with the worm shaft 30 from the inside.
The rotation direction limiting part 49 rotatably supports the outer ring member 45 from the inside, and connects the support part 47 and the outer ring member 45 fixed to the housing 10 to the support part 47 to support the part 47. The outer ring member 45 is rotated in a predetermined direction with respect to.
The rotation direction limitation part 49 is pin-shaped, and is mounted so that the center axis may face the worm shaft rotation shaft 31. The end portion of the support portion 47 is rotatably coupled to the outer ring member 45 and the support portion 47.
3 is a view showing the tilting direction of the worm shaft according to an embodiment of the present invention.
Referring to FIG. 3, in this embodiment, the rotation direction limiting part 49 is mounted in a direction parallel to the rotation axis of the worm wheel gear 20. When the rotation direction limiting portion 49 is mounted in a direction parallel to the rotation axis of the worm wheel gear 20, the outer ring member 45 rotates only in the direction in which the rotation direction limiting portion 49 is the rotation center.
In this embodiment, the rotation direction limiting portion 49 is provided with a pair symmetrically with respect to the worm shaft 30, to prevent the outer ring member 45 from being separated from the rotational direction limiting portion 49, the worm shaft ( The direction of rotation of 30 is certainly limited. In addition, the present embodiment has the effect of preventing the breakage of the rotation direction limiting part 49, the outer ring member 45 and the support 47 by dispersing the load concentrated on the single rotation direction limiting part (49).
Hereinafter, with reference to the accompanying drawings will be described in detail the operating state of the noise reduction electric steering apparatus 1 according to an embodiment of the present invention.
The steering force for steering of the vehicle is measured by a sensor and input to a controller (not shown). Based on this, the controller drives the motor member 5 of the noise reduction electric steering apparatus 1.
The motor member 5 generates rotational power to rotate the worm shaft 30 connected to the motor member 5, and thus the worm wheel gear 20 engaged with the worm shaft 30 rotates.
When the impact generated on the road surface is transmitted to the worm wheel gear 20 through the steering shaft 3 to push the worm shaft 30 to the upper side (upper side in Fig. 3), the worm shaft 30 is the rotation direction limiting part 49 Alleviate the impact while tilting the shaft.
In addition, since the worm shaft 30 is pressed in the direction of the worm wheel gear 20 by the coil spring 9, the worm shaft 30 maintains a state of being engaged with the worm wheel gear 20 and the gap between the worm wheel gear 20 and the worm shaft 30 is generated. Can be prevented.
According to the present invention, the rotation direction of the worm shaft 30 is limited by the rotation direction limiting part 49 to prevent the occurrence of a joint that may occur when the worm shaft 30 is tilted in another direction, and the worm wheel gear 20 and the worm shaft 30 Gears can stay engaged.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.
In addition, the noise reduction type electric steering apparatus used in automobiles has been described as an example, but this is merely illustrative, and the noise reduction type electric steering apparatus according to the present invention may be used in other types of devices using the electric steering apparatus. .
Therefore, the true technical protection scope of the present invention will be defined by the claims.
1: Noise Reduction Electric Steering
3: steering shaft 5: motor member
7: pressure bearing 9: coil spring
10: housing 20: worm wheel gear
30: warm shaft 40: tilting direction limit
41: inner ring member 42: inner through hole
43: sliding member 45: outer ring member
47: support part 49: rotation direction limiting part

Claims (5)

  1. housing;
    A worm wheel gear fixed to an outer side of the steering shaft in the housing;
    A worm shaft engaged with the worm wheel gear; And
    A tilting direction limitation part rotatably supporting the worm shaft and limiting a tilting direction of the worm shaft;
    Noise reduction electric steering device comprising a.
  2. The method of claim 1,
    The tilt direction limit unit,
    An inner ring member having an inner through hole into which the worm shaft is inserted;
    A plurality of sliding members installed outside the inner ring member to reduce friction;
    An outer ring member spaced apart from the inner ring member with the sliding member therebetween;
    A support part rotatably supporting the outer ring member at an inner side and fixed to the housing; And
    A rotation direction limiting part mounted between the support part and the outer ring member and restricting the outer ring member to rotate in a predetermined direction with respect to the support part;
    Noise reduction electric steering device comprising a.
  3. 3. The method of claim 2,
    The rotation direction limiting portion,
    A pin-shaped, noise reduction electric steering device, characterized in that the central axis is facing the worm shaft rotation axis, each end is rotatably coupled to the outer ring member and the support.
  4. The method of claim 3, wherein
    The rotation direction limiting portion,
    Noise reduction electric steering device, characterized in that mounted in a direction parallel to the rotation axis of the worm wheel gear.
  5. The method according to any one of claims 2 to 4,
    The rotation direction limiting portion,
    Noise reduction electric steering device characterized in that a pair is provided symmetrically with respect to the rotation axis of the worm shaft.
KR1020120081414A 2012-07-25 2012-07-25 Noise reduction type motor driven power steering KR20140014714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120081414A KR20140014714A (en) 2012-07-25 2012-07-25 Noise reduction type motor driven power steering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120081414A KR20140014714A (en) 2012-07-25 2012-07-25 Noise reduction type motor driven power steering

Publications (1)

Publication Number Publication Date
KR20140014714A true KR20140014714A (en) 2014-02-06

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KR1020120081414A KR20140014714A (en) 2012-07-25 2012-07-25 Noise reduction type motor driven power steering

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160002512A (en) * 2014-06-30 2016-01-08 현대모비스 주식회사 Motor driven power steering system
KR20160048268A (en) * 2014-10-23 2016-05-04 현대모비스 주식회사 Electric power steering device
WO2018124441A1 (en) 2016-12-29 2018-07-05 이래에이엠에스 주식회사 Electric power steering system
KR20180078050A (en) 2016-12-29 2018-07-09 이래에이엠에스 주식회사 Motor-driven power steering system
KR20190104806A (en) * 2018-03-02 2019-09-11 셰플러코리아(유) A Motor-Driven Power Steering Apparatus
KR102033558B1 (en) * 2018-05-18 2019-10-17 주식회사 만도 Reducer of Electric power steering apparatus
KR102088485B1 (en) * 2018-09-07 2020-03-12 주식회사 디엠씨 Damping Bushings for Steering Gears of Vehicles

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160002512A (en) * 2014-06-30 2016-01-08 현대모비스 주식회사 Motor driven power steering system
KR20160048268A (en) * 2014-10-23 2016-05-04 현대모비스 주식회사 Electric power steering device
WO2018124441A1 (en) 2016-12-29 2018-07-05 이래에이엠에스 주식회사 Electric power steering system
KR20180078070A (en) 2016-12-29 2018-07-09 이래에이엠에스 주식회사 Motor-driven power steering system
KR20180078050A (en) 2016-12-29 2018-07-09 이래에이엠에스 주식회사 Motor-driven power steering system
KR20190104806A (en) * 2018-03-02 2019-09-11 셰플러코리아(유) A Motor-Driven Power Steering Apparatus
KR102033558B1 (en) * 2018-05-18 2019-10-17 주식회사 만도 Reducer of Electric power steering apparatus
KR102088485B1 (en) * 2018-09-07 2020-03-12 주식회사 디엠씨 Damping Bushings for Steering Gears of Vehicles

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