KR101706859B1 - Damper integrated bearing assembly - Google Patents

Damper integrated bearing assembly Download PDF

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Publication number
KR101706859B1
KR101706859B1 KR1020150127007A KR20150127007A KR101706859B1 KR 101706859 B1 KR101706859 B1 KR 101706859B1 KR 1020150127007 A KR1020150127007 A KR 1020150127007A KR 20150127007 A KR20150127007 A KR 20150127007A KR 101706859 B1 KR101706859 B1 KR 101706859B1
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KR
South Korea
Prior art keywords
damper
inner case
bearing
rack
shape
Prior art date
Application number
KR1020150127007A
Other languages
Korean (ko)
Inventor
이제호
Original Assignee
주식회사 만도
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Publication date
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Priority to KR1020150127007A priority Critical patent/KR101706859B1/en
Application granted granted Critical
Publication of KR101706859B1 publication Critical patent/KR101706859B1/en

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Classifications

    • 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
    • B62D5/0445—Screw drives
    • B62D5/0448—Ball nuts
    • 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
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/04—Ball or roller bearings, e.g. with resilient rolling bodies
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/07—Fixing them on the shaft or housing with interposition of an element
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/1207—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon characterised by the supporting arrangement of the damper unit
    • F16F15/1208—Bearing arrangements
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/20—Land vehicles
    • F16C2326/24—Steering systems, e.g. steering rods or columns

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Support Of The Bearing (AREA)

Abstract

The present invention relates to a steering apparatus for a vehicle, and more particularly, to a steering apparatus for a vehicle, which comprises a rack having one side engaged with a pinion gear connected to a steering wheel of the vehicle and the other side having a thread on an outer circumferential surface thereof, a rack housing into which the other side of the rack is inserted, A ball nut disposed between the housing and the rack and linearly moving the rack in the direction of the central axis; a bearing inserted between the rack housing and the ball nut to rotatably support the ball nut; And a rubber-integrated damper including the inner case and the outer case integrally formed, the inner case including an inner case rotatably supporting the inner case and an outer case accommodating the inner case. According to the present invention, since the rubber is integrally formed in the damper, it can be easily assembled even in a place other than a professional manufacturer, and the assembling property is improved. In addition, it is possible to design such that the desired rigidity can be realized by changing the kind and thickness of the rubber, and there is an advantage that it can be designed in consideration of the tolerance with peripheral parts.

Description

[0001] Damper integrated bearing assembly [0002]

The present invention relates to a damper-integrated bearing assembly, and more particularly, to a damper-integrated bearing assembly capable of improving assembling performance and achieving required rigidity by integrally forming a damper on a bearing.

Generally, an electric power steering device is a device that assists the steering force of a vehicle by driving an electric motor. Among them, the steering wheel is lightened when the vehicle speed is low, the steering stability is improved by weighting the steering wheel when the vehicle speed is high The rack-type power steering apparatus of the electric power steering apparatus is provided with a cylindrical housing in the left and right direction of the vehicle, and a rack is received in the housing so as to be linearly movable. Each end of the rack is supported by a ball joint Lt; / RTI > The rack is connected to a steering shaft connected to the steering wheel by a rack pinion mechanism. The rotary motion of the steering wheel is converted into linear motion by the rack pinion mechanism, and the rack is linearly moved.

A ball nut is rotatably supported on the outer periphery of the rack, and an electric motor having a rotation axis parallel to the axis of the ball nut is disposed around the rack. When the user operates the steering wheel, the electric motor is driven to assist the steering force.

An example of such an electric power steering device is disclosed in Korean Patent Registration No. 0835193, and a damping structure such as a bearing is provided to prevent vibration caused by driving a rack and a ball nut or noise due to external vibration.

However, such a conventional damping structure has a complicated assembling process, requires a long assembly time, and requires a special company to work because the components are separate structures. Further, in assembling the damping structure made of a separate structure, it is difficult to manage the tolerance with the surrounding components, and it is difficult to secure the necessary rigidity due to the structural limitations.

Korean Patent Registration No. 0835193 (Registration date: 2008. 06. 04)

SUMMARY OF THE INVENTION An object of the present invention is to provide a damper-integrated bearing assembly capable of improving assemblability and achieving required rigidity by integrally forming a damper on a bearing.

The damper integrated bearing assembly according to the present invention includes a bearing for rotatably supporting an object to be rotated, a cylindrical inner case for rotatably supporting the bearing, and a damper having a cylindrical outer case for accommodating the inner case And the damper has a shape in which the inner case and the outer case are integrally formed, and both end portions of the cylindrical shape are bended toward the bearing.

The inner case includes a rubber material, and the outer case includes a metal material.

The damper is characterized in that protrusions and recesses are alternately formed at both ends of the cylindrical shape of the inner case and the outer case.

The protrusion may be one of a semicircular shape and a fan shape, and the recess may be a semicircular shape, a fan shape, or a straight shape.

The damper is configured to bend the protrusion provided at one side of the cylindrical shape to the bearing at a right angle, insert the bearing, and bend the protrusion provided at the other side of the cylindrical shape toward the bearing to house the bearing .

The electric power steering apparatus according to an embodiment of the present invention can easily assemble the damper even in a place other than a professional manufacturer by integrally forming the rubber in the damper, thereby improving the assemblability. In addition, it is possible to design such that the desired rigidity can be realized by changing the kind and thickness of the rubber, and there is an advantage that it can be designed in consideration of the tolerance with peripheral parts.

1 is a sectional view showing a part of an electric power steering apparatus,
FIG. 2 is a perspective view showing a damper-integrated bearing assembly according to an embodiment of the present invention, FIG.
3 is an exploded perspective view illustrating a damper-integrated bearing assembly according to an embodiment of the present invention.

Hereinafter, a damper integrated bearing assembly according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing a part of an electric power steering apparatus, FIG. 2 is an assembled perspective view showing a damper-integrated bearing assembly according to an embodiment of the present invention, FIG. 3 is a perspective view showing a damper- Fig. 3 is an exploded perspective view showing the bearing assembly.

As shown in FIG. 1, the damper-integrated bearing assembly according to an embodiment of the present invention is for rotatably supporting a rotating object. For the sake of convenience, the electric power steering apparatus of a vehicle will be described as an example (However, the present invention is not limited to this embodiment, but may be variously applied to bearings and dampers where necessary).

The electric power steering device 10 is a belt-driven rack-driven steering device that includes a rack housing 100 and a rack 200 (the general structure and operation of the steering device is disclosed in the art Only the necessary parts for the understanding of the present invention will be described, and a detailed description thereof will be omitted).

The rack 200 is inserted into the rack housing 100 and teeth are formed at one side of the rack 200 and teeth of a pinion gear (not shown) connected to a steering wheel ). A thread 210 is formed on a portion of the other side of the rack 200 and a ball nut 400 is disposed between the rack housing 100 and the rack 200 to cover a part of the thread 210. A pulley 300 is coupled to the outside of the ball nut 400.

The ball nut 400 is in press fit with the pulley assembly 300 and is rotatably supported by the damper 500 and the bearing 600.

The outer circumferential surface of the ball nut 400 is constrained to the pulley assembly 300 and the inner circumferential surface thereof is formed with a thread groove corresponding to the thread 210. When the screw groove is engaged with the threaded line 210 of the rack 200, the rack 200 linearly moves in the direction of the central axis x. The ball nut 410 is driven by an electric motor 350.

The electric motor 350 is installed on one side of the rack housing 100 and the rotary shaft 352 of the electric motor 350 is connected to the pulley assembly 300 by a timing belt 354. [ When the electric motor 350 is operated, the rotation shaft 352 rotates to drive the timing belt 354 to rotate the pulley assembly 300, and the ball nut 400 is rotated by the rotation of the pulley assembly 300.

2 and 3, the bearing assembly is composed of a damper 500 and a bearing 600. The damper 500 has a cylindrical shape surrounding the outer periphery of the bearing 600, And the bearing 600 is inserted into the inside. The cylindrical shape of the damper 500 is a general channel shape, but in this embodiment, both ends of the cylindrical shape of the damper 500 are partially blocked by the projecting portion 500a and the recessed portion 500b to be described later. That is, the damper 500 has a shape different from that of a general cylindrical damper shape. The damper 500 can be divided into an outer case 510 and an inner case 530 and is inserted between the rack housing 100 and the ball nut 400.

The outer case 510 may be made of a metal material, and the inner case may be made of an elastic material including a rubber material. The outer case 510 may be formed of a metal material so as not to be easily worn by external shock or vibration in a state where the outer case 510 is coupled to the rack housing 100. The inner case 530 is made of an elastic material including rubber so as to minimize the noise and vibration generated when the vibration generated when the ball nut 400 is coupled with the bearing 600 is transmitted to the bearing 600 . Further, the outer case 510 and the inner case 530 are preferably integrally formed. Accordingly, since the outer case 510 and the inner case 530 are not separately assembled, the assembling process and the time are shortened.

Here, the material and thickness of the inner case 530 may be varied so as to have required rigidity, and even if the same material is used, it is possible to selectively use a material having a high density, a gap, a high porosity, . In addition, the inner case 530 may be formed of a single layer of the same material, or may be formed of a plurality of layers of different materials, or a plurality of layers of the same material or different materials but different porosities may be formed . This choice will depend on the stiffness required. In addition, when the inner case 530 is formed, the thickness and the shape of the inner case 530 are changed in consideration of the tolerance with respect to the peripheral parts, thereby reducing the tolerance to the peripheral parts and reducing the manufacturing cost.

The outer case 510 and the inner case 530 are formed by machining a plate material having a predetermined width into a cylindrical shape and are formed in such a manner that both of the projections 500a and the recesses 500b, Lt; / RTI > The protrusions 500a may have a semicircular shape or a fan shape, and the recesses 500b may be recessed in a semicircular shape, a fan shape, or the like between the protrusions 500a. Or the concave portion 500b may be connected in a linear form between the protrusions 500a. The protrusions 500a are bended inward toward the bearings 600 and are bent to be perpendicular to a virtual center axis along the longitudinal direction of the damper 500. [

The reason why the protrusion 500a is vertically bent in the direction of the bearing 600 of the damper 500 is to prevent the bearing 600 from deviating in the direction of the hollow axis of the damper 500. [

Bending the edge of the cylindrical damper takes a long time and is difficult to process. Therefore, if the edges of the damper 500 are formed so as to have a shape in which the protrusions 500a and the recesses 500b are formed alternately rather than straight, the time required for the bending process is shorter and the process is easier There is one advantage.

One end of the damper 500 is bent at a right angle to the outer circumferential surface of the damper 500 in a state where the outer case 510 and the inner case 530 are integrally formed and then the bearing (600). Accordingly, it is possible to prevent the bearing 600 from being arbitrarily deviated in one direction of the damper 500. When the other side edge of the damper 500 is bent at a right angle with the outer peripheral surface again after the bearing 600 is inserted, the coupling of the bearing 600 is completed and the bearing 600 is held in the inserted state of the damper 500 . In this state, the assembly of the damper 500 and the bearing 600 is coupled to the rack housing 100.

When the damper 500 is vertically bent inward in the direction of the hollow shaft, the ball nut 400 can be prevented from being damaged by the bearing 600 and the damper 500, And the inner case 530 inside the damper 500 absorbs the vibration of the worm shaft 300 and hence the noise. Therefore, noise and vibration of the steering apparatus are reduced as a whole.

An embodiment of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can improve and modify the technical spirit of the present invention in various forms. Accordingly, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

10: Electric power steering device
100: rack housing 200: rack
300: pulley assembly 400: ball nut
500: damper 510: outer case
530: Inner case 500a:
500b: concave portion 600: bearing

Claims (5)

A bearing for rotatably supporting the object to be rotated,
And a damper having a cylindrical inner case for rotatably supporting the bearing and a cylindrical outer case for accommodating the inner case,
The damper is characterized in that the inner case and the outer case are integrally formed, and both end portions of the cylindrical shape are bended toward the bearing.
Wherein the inner case is formed of a single layer of the same material or a plurality of layers of different materials, and when the inner case is formed of a plurality of layers, the porosity of the plurality of layers is different. The method according to claim 1,
Wherein the inner case includes a rubber material, and the outer case includes a metal material. 3. The method of claim 2,
Wherein the damper has protrusions and recesses alternately formed at both ends of the cylindrical shape of the inner case and the outer case. The method of claim 3,
Wherein the protrusion is one of a semicircular shape and a fan shape, and the recess is one of a semicircular shape, a fan shape, and a straight shape. 5. The method of claim 4,
The damper is configured to bend the protrusion provided at one side of the cylindrical shape to the bearing at a right angle, insert the bearing, and bend the protrusion provided at the other side of the cylindrical shape toward the bearing to house the bearing A damper-integrated bearing assembly characterized by:
KR1020150127007A 2015-09-08 2015-09-08 Damper integrated bearing assembly KR101706859B1 (en)

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Application Number Priority Date Filing Date Title
KR1020150127007A KR101706859B1 (en) 2015-09-08 2015-09-08 Damper integrated bearing assembly

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Application Number Priority Date Filing Date Title
KR1020150127007A KR101706859B1 (en) 2015-09-08 2015-09-08 Damper integrated bearing assembly

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KR101706859B1 true KR101706859B1 (en) 2017-02-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102553662B1 (en) 2022-06-30 2023-07-12 조범종 Bearing housing with bearing outer ring and auxiliary footrest system for vehicle including the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100835193B1 (en) 2003-10-29 2008-06-04 주식회사 만도 Electric power steering system
KR20130003312A (en) * 2011-06-30 2013-01-09 한국델파이주식회사 Electric power steering apparatus
KR20150028939A (en) * 2013-09-06 2015-03-17 주식회사 디엠씨 Electric steering damping Bush

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100835193B1 (en) 2003-10-29 2008-06-04 주식회사 만도 Electric power steering system
KR20130003312A (en) * 2011-06-30 2013-01-09 한국델파이주식회사 Electric power steering apparatus
KR20150028939A (en) * 2013-09-06 2015-03-17 주식회사 디엠씨 Electric steering damping Bush

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102553662B1 (en) 2022-06-30 2023-07-12 조범종 Bearing housing with bearing outer ring and auxiliary footrest system for vehicle including the same

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Payment date: 20191219

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