KR101560251B1 - Clearance compensation device using rubber damper - Google Patents

Abstract

Disclosure of the Invention The invention relating to a clearance compensating apparatus using a damper is disclosed. A clearance compensating apparatus using a rubber damper, comprising: a body provided in a housing portion of a housing and having a space portion therein; a pressing portion movably installed in a space portion of the body and pressing the outer peripheral surface of the bearing; And a damper portion provided in the space portion of the body to provide an additional damping force to the outer peripheral surface of the bearing.

Description

Technical Field [0001] The present invention relates to a clearance compensation device using a rubber damper,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a clearance compensating apparatus using a rubber damper, and more particularly, to a clearance compensating apparatus using a rubber damper, in which the damper force And more particularly, to a clearance compensation apparatus using a rubber damper capable of improving the damping efficiency while providing a structure.

Generally, motorized power steering (MDPS) is a power steering that assists a driving force of a driver by using a driving force of a motor, and receives steering information from a sensor, vehicle speed and vehicle state information from the vehicle ECU It is a device that generates a motor control signal so as to realize an appropriate auxiliary steering force (braking force).

In addition, the gearbox, a motor-driven power steering steering gear, drives the motor according to control signals received from the ECU. The driving force of the motor is decelerated and energized through a speed reducer composed of a worm and a worm wheel gear to perform the running.

The bowing device of electric power steering has a clearance compensating device that presses the outer circumferential surface of the bearing provided at the end of the warm shaft to closely contact the worm shaft with the worm wheel to reduce rattle noise due to the occurrence of clearance .

FIG. 1 is a view showing electric power steering with a conventional spring type clearance compensating device. A conventional electric power steering 3 is provided in a column 2 of a steering wheel 1. FIG. The electric power steering 3 includes a worm shaft 4 rotated by the power of the drive motor, a worm wheel 5 which is engaged with the teeth of the worm shaft 4 to supplement the power to the column 2, A ratchet compensating device for pressing the outer circumferential surface of the bearing 6 provided at the end of the worm wheel 4 against the worm wheel 5 to reduce rattle noise due to the crevice .

The position compensating device includes a spring type position compensating device using an elastic force of a coil spring and a combined type position compensating device combining a spring and a hydraulic damping structure. The spring type play compensating device includes a pressing member 8 inserted into the housing 7 and a coil spring 9 installed in the housing 7 to provide an elastic force to the pressing member 8,

Conventional spring type compensating devices use coil springs mainly to reduce impact noise of worm wheel and worm shaft. When coil spring has a large pressing force, friction resistance, torque fluctuation, and vehicle restoring force are increased and steering is difficult And when the pressing force of the coil spring is weak, the frictional resistance is reduced and the restoring force is improved. However, there is a problem that the gap between the worm wheel and the worm shaft is loose,

In order to solve this problem, in recent years, a hydraulic type damping structure has been added instead of using only a coil spring to pressurize the outer circumferential surface of a bearing of a warm shaft, thereby effectively absorbing flow and impact, Is used.

However, the complex type clearance compensating device has a complicated structure due to a large number of parts for guiding the movement of the hydraulic pressure, and not only the manufacturing cost is increased. There is a problem that the damping function is deteriorated due to leakage of oil during prolonged use.

Therefore, both of the spring type position compensating device and the combined type position compensating device have problems, and therefore, there is a need for an improved position compensating device that is simple in structure and capable of improving the damping force.

Korean Patent Laid-Open No. 10-2011-0064018 (Publication Date: 2011, 06, 15, entitled "Electric Power Steering Device"

The present invention has been made in view of the above-mentioned need, and it provides a simple structure because damping force of two or more stages such as a first damping force of a spring and a second damping force of a damper portion are sequentially absorbed, And to provide a play compensating device using a rubber damper capable of enhancing the playability of the play.

According to an aspect of the present invention, there is provided a play compensating apparatus using a rubber damper, the play compensating apparatus comprising: a body installed in a receiving portion of a housing and having a space portion therein; A pressing portion which is movably installed in a space portion of the body and presses the outer peripheral surface of the bearing; A spring installed in the space portion to provide a damping force to the pressing portion; And a damper unit provided in the space of the body to provide additional damping force to the outer circumferential surface of the bearing.

In addition, the receiving portion is formed to be open to the front side of the body, the body has a recessed groove formed in the front inner circumferential surface of the receiving portion, and a snap ring member for preventing the pressing portion from being separated from the recessed groove is provided, And a washer member is provided between the pressing portion and the pressing portion.

Further, the damper unit may include a damping member of a soft material provided on at least one of the outer side and the inner side of the spring; And a spacing part spaced apart from the damping member by a predetermined distance from a support plate or a shape retaining protrusion provided on the pressing part.

The damping member may be a circular rubber tube that surrounds the outer side of the spring, and a bottom plate is formed on the bottom surface of the damping member so as to be supported by the bottom of the space while receiving the spring. And a guide protrusion inserted into the guide groove and guiding the linear movement position of the spring.

Further, the damping member is a rubber rod inserted into the spring, and a bottom plate is formed on the bottom surface of the damping member, the bottom plate being supported by the bottom of the space while receiving the spring.

Further, the damping member is fixed to the bottom of the space of the body so as to provide the damping force to the pressing portion while the spring is contracted first by the spacing by the flow and impact of the pressing portion .

In addition, the spacing portion may include: a first spacing portion formed between a damping member of a circular rubber tube shape provided on the outer side of the spring and the support plate; And a second spacing portion formed between the damping member having a rubber rod shape provided inside the spring and the shape retaining protrusion at a different spacing from the first spacing portion.

Further, the damping member is formed with a narrow portion that becomes narrower toward the end portion thereof, and the damping member is fixed to the bottom of the space portion of the body by the fixing portion, and the damping member includes a depression A groove; And a fitting protrusion protruding from the body or the damping member to be press-fitted into the recessed groove.

The gap compensating apparatus using the rubber damper according to the present invention absorbs the flow and impact sequentially by using the damping force of two or more stages such as the first damping force of the spring and the second damping force of the damper portion, Lt; / RTI >

Further, according to the present invention, the difference in damping force can be clarified by dividing the primary damping force by the spring and the secondary damping force for the spring and the damping member by forming the spacing portion having the predetermined gap between the damping member and the pressing portion have.

Further, by applying the damping member as a soft material, the mechanical impact sound of the spring can be effectively blocked, and the steering feeling can be improved.

Further, according to the present invention, the damping force can be greatly increased according to the movement amount by forming the narrow portion at the end portion of the damping member.

In addition, the present invention can firmly restrain the body and the damping member using the fixed portion.

1 is a view showing electric power steering with a conventional spring type clearance compensating device.
FIG. 2 is a view illustrating a housing installation state of a play compensating apparatus using a rubber damper according to a first embodiment of the present invention.
3 is an exploded perspective view of a clearance compensating apparatus using a rubber damper according to the first embodiment of the present invention.
4 is a partially cutaway perspective view of a play compensating apparatus using a rubber damper according to the first embodiment of the present invention.
FIG. 5 is a sectional view of an installation state of a play compensating apparatus using a rubber damper according to a first embodiment of the present invention.
6 is a state sectional view of a clearance compensating apparatus using a rubber damper according to a first embodiment of the present invention, which includes a fixed portion and a narrow portion.
7 is an exploded perspective view of a clearance compensating apparatus using a rubber damper according to a second embodiment of the present invention.
8 is a partially cutaway perspective view of a clearance compensating apparatus using a rubber damper according to a second embodiment of the present invention.
FIG. 9 is a sectional view of an installation state of a play compensating apparatus using a rubber damper according to a second embodiment of the present invention.
10 is a state sectional view of a clearance compensating device using a rubber damper according to a second embodiment of the present invention, which includes a fixing part and a narrow part.
11 is a partially cutaway perspective view of a clearance compensating apparatus using a rubber damper according to a third embodiment of the present invention.
FIG. 12 is a sectional view of the installation of the damper according to the third embodiment of the present invention.

Hereinafter, a play compensating apparatus using a rubber damper according to an embodiment of the present invention will be described with reference to the accompanying drawings.

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.

3 is a disassembled perspective view of a clearance compensating apparatus using a rubber damper according to a first embodiment of the present invention, and FIG. 3 is an exploded perspective view of the clearance compensating apparatus using the rubber damper according to the first embodiment of the present invention. 4 is a partially cutaway perspective view of a clearance compensating apparatus using a rubber damper according to a first embodiment of the present invention, FIG. 5 is a sectional view of the clearance compensating apparatus using a rubber damper according to the first embodiment of the present invention, 6 is a state sectional view of the clearance compensating device using the rubber damper according to the first embodiment of the present invention, which is provided with a fixing portion and a narrow portion.

FIG. 7 is an exploded perspective view of a clearance compensating apparatus using a rubber damper according to a second embodiment of the present invention, FIG. 8 is a partially cutaway perspective view of a clearance compensating apparatus using a rubber damper according to a second embodiment of the present invention, 9 is a cross-sectional view of the gap compensating apparatus using the rubber damper according to the second embodiment of the present invention. FIG. 10 is a sectional view of the clearance compensating apparatus using the rubber damper according to the second embodiment of the present invention. Fig.

FIG. 11 is a partially cutaway perspective view of a clearance compensating apparatus using a rubber damper according to a third embodiment of the present invention, and FIG. 12 is a sectional view of the clearance compensating apparatus using a damper according to the third embodiment of the present invention.

1 to 12, a clearance compensating apparatus 100 using a rubber damper according to an embodiment of the present invention includes a body 10, a pressing unit 20, a spring 30, and a damper unit 40, .

The clearance compensating apparatus 100 using the rubber damper according to the embodiment of the present invention is provided with an outer peripheral surface of the bearing 6 provided at the end of the worm shaft 4 driven to assist the operation of the electric power steering 3 And is mounted on the housing 7 to press the worm shaft 4 toward the worm wheel 5 to reduce rattle noise due to the occurrence of a gap.

2, the housing portion 11 is formed in the housing 7 that houses the worm wheel 5 and the worm shaft 4 in the internal installation space. The housing portion 7 is formed in the end portion of the worm shaft 4 And is an installation hole penetratingly formed on the inside and outside of the housing 7 so that the clearance compensating apparatus 100 according to the present invention is installed to press the outer circumferential surface of the bearing 6.

The accommodating portion 11 is connected to the engaging portion 12 to which the support plate 24 of the pressing portion 20 is to be attached and the pressing rod 22 of the pressing portion 20 inwardly at the center portion of the engaging portion 12 And a through hole (14) for allowing the bearing (6) to be brought into contact with the outer circumferential surface of the bearing (6).

The body 10 is inserted into the receiving portion 11 of the housing 6 and is provided with a space portion 13 therein.

The space portion 13 is opened to the front side of the body 10,

The body 10 may have a recessed groove 15 formed in the front inner circumferential surface of the space 13. The recessed groove portion 15 may be provided with a snap ring member 16 for preventing the pressing portion 20 from coming off.

A washer member 19 may be further provided between the retaining member 16 and the pressing portion 20. The washer member 19 prevents the pressing portion 20 from being pushed out of the snap ring member 16.

On the rear side of the body 10, a polygonal head 17 for fastening with a fastening tool such as a spanner or the like can be formed. It is preferable that the polygonal head portion 17 be a hexagonal bolt head.

A threaded portion 18 to be fastened to a threaded portion formed on the inner circumferential surface of the receiving portion 11 may be formed in part or all of the outer circumferential surface of the body 10. [

The pressing portion 20 is movably installed in the space portion 13 of the body 10 and presses the outer circumferential surface of the bearing 6 of the worm shaft 4. The pressing portion 20 always presses the outer circumferential surface of the bearing 6 to prevent the worm shaft 4 from swinging.

The pressing portion 20 is provided with a pressing rod 22 which presses the outer circumferential surface of the bearing 6 and a supporting plate 22 which is connected to the rear side of the pressing rod 22 and is caught by the body 10, And a shape retaining protrusion 26 provided on the support plate 24 and inserted into the spring 30 to maintain the movement position of the spring 30 when the presser 20 is moved.

The pressing rod 22 is in the form of a circular or polygonal rod and is contacted and supported on the outer peripheral surface of the bearing 6. [

The support plate 24 is preferably formed in a circular or polygonal shape corresponding to the cross-sectional shape of the space portion 13 of the body 10.

The outer diameter of the support plate 24 is formed to be smaller than or equal to the inner diameter of the accommodating portion 11 so that the support plate 24 is structured to prevent lateral flow when the support plate 24 slides.

It is preferable that the outer diameter of the shape retaining protrusion 26 is formed to be slightly smaller or substantially coincident with the inner diameter of the spring 30. [ The shape maintaining protruding portion 26 serves as a guide for allowing the spring 30 to be stably guided without being disengaged when the pressing portion 20 is moved and damped.

The end edge portion of the shape retaining projection 26 can be rounded so that the spring 30 can be smoothly moved without being caught.

The spring 30 is provided in the space portion 13 of the body 10 to provide a damping force to the pressing portion 20. Since the spring 30 always provides an elastic force to the pressing portion 30, the bearing 6 is given a primary damping force,

The spring 30 is preferably a coil spring.

Since the spring 30 is formed by winding the steel wire in a circular shape, the elastic force may be weakened when operated frequently, and the impact sound that causes the rattle joint may be transmitted through the spring 30, which is a rigid body.

When the pressing force of the spring 30 is large in order to reduce the impact noise of the worm wheel 5 and the worm shaft 4, the frictional resistance, the torque fluctuation and the vehicle restoring force are increased to make steering difficult, The frictional resistance reduction and the restoring force are improved but the gap between the worm wheel 5 and the worm shaft 4 is loosened and the rattle joint becomes large.

The pressing portion 20 efficiently absorbs the clearance of the bearing 6 of the worm shaft 4 when pressing the outer circumferential surface of the bearing 6 of the worm shaft 4 depending on the elastic force of the spring 30 And the shock absorption of the spring 30 is mechanical, so that it is not possible to provide a smooth steering feeling to the driver when the steering wheel is steered.

Therefore, there is a need to provide a damper portion 40 of a soft material which is not mechanically different from the spring 30 and can enhance the quality of sensibility.

The damper portion 40 is provided in the space portion 13 of the body 10 to provide an additional damping force to the outer peripheral surface of the bearing 6. [

The damper portion 40 provides additional damping force to the outer peripheral surface of the bearing 6 separately from the spring 30. That is, in addition to the primary damping force applied to the outer peripheral surface of the bearing 6 in the spring 30, the secondary damping force is provided to the outer peripheral surface of the bearing 6 through the damper portion 40.

Therefore, as the flow due to the shaking increases, the damping force of the bearing 6 is greatly increased, so that the impact sound can be effectively blocked and prevented.

Particularly, since the damper portion 40 is made of a soft material such as a rubber material or a soft synthetic resin material having a high absorption rate of an impact sound rather than a rigid body, it is possible to improve the absorption efficiency of the rattle joint Can be promoted.

The damper unit 40 includes damping members 42 and 44 made of a soft material provided on at least one of the outer side and the inner side of the spring 30 and the damping members 42 and 44 provided in the damping members 42 and 44, And a spacing portion 46 which is formed while being separated from the support plate 24 or the shape retaining protrusion 26 by a predetermined gap.

2 to 6, the damping member 42 is a cylindrical circular rubber tube that surrounds the outside of the spring 30.

A bottom plate 45 may be formed on the bottom surface of the damping member 42 to be supported by the bottom of the space 13 while receiving the spring 30.

At this time, the bottom plate 45 may be provided with a guide protrusion 48 which is inserted into the center of the spring 30 and guides the linearly moving position of the spring 30.

Since the damping member 42, the bottom plate 45 and the guide protrusion 48 are integrally formed, the spring 30 is stably stored and supported in a state where the spring 30 is prevented from flowing .

The dipping member 42 may be fixed to the inside of the space portion 13 of the body 10 by at least one of a press-fitting method, an adhesive method, a locking method, and a screw method.

This damping member 42 is damped while the back surface of the supporting plate 24 of the pressing portion 20 moves by a distance corresponding to the distance 46 and is contacted and compressed.

It is preferable that the outer diameter of the guide protrusion 48 is formed to be slightly smaller or almost coincident with the inner diameter of the spring 30. The guide protrusion 48 serves as a guide for stably guiding the spring 30 without detaching when the pressing portion 20 is moved and damped.

The end edge portion of the guide protrusion 48 can be rounded so that the spring 30 can be smoothly moved without being caught.

Referring to Figs. 7 to 10, the damping member 44 is a rubber rod inserted into the spring 30.

A bottom plate 45 may be formed on the bottom surface of the damping member 44 to receive the spring 30 and be contacted with the bottom of the space 13.

Since the damping member 44 and the bottom plate 45 are integrally formed and the damping member 44 is elongated at the central portion, the spring 30 can be stably supported in the state of preventing the flow of the spring 30 can do.

The dipping member 44 may be fixed to the bottom of the space 13 of the body 10 by at least one of a press-fitting method, an adhesive method, a locking method, and a screw method.

The damping member 44 is damped while being contacted with the shape retaining protrusion 26 of the pressing portion 20 after the back surface thereof is moved by a distance corresponding to the distance 46.

A wrench groove (not shown) for fastening may be formed on the back surface of the body 10.

The damping members 42 and 44 are contracted by the flow and impact of the pressing portion 20 and then the spring 30 is first contracted by the spacing portion 46 and then secondarily contracted together with the spring 30, (Not shown) to provide additional damping force to the body 10.

The damping members 42 and 44 are shown to be fixed in an adhesive manner as shown in Figs. 2 to 5 and Figs. 7 to 9.

6, 10 and 12, the damping members 42 and 44 have narrow portions 50 that become narrower as they are passed by the end portions, so that the pressing portions 20 are formed at the ends of the damping members 42 and 44 The damping force can be gradually increased in accordance with the movement of the pressing portion 20 in the secondary contraction progress.

It is preferable that the narrow portion 50 be formed in an isosceles square shape.

The narrow portion 50 may be formed to be gradually narrowed toward the end portion in various ways. That is, they may be formed to be narrowed in multi-tiers in a stepwise shape symmetrical to the left or right, or narrowed in a non-linearly symmetrical bending shape.

As the narrow portion 50 becomes gradually narrower toward the end portions of the damping members 42 and 44, the support plate 24 of the pressing portion 20 moves the spring 30 by the distance of the spacing portion 46 The damping member 26 is temporarily compressed and damped so that the support plate 24 or the shape retaining protrusion 26 of the presser 20 contacts the damping members 42 and 44. Thereafter, As the supporting force increases, it is possible to effectively block and prevent the rattle joint such as an impact sound.

As described above, the narrow portion 50 effectively increases the damping force as the load supporting force becomes larger as the moving distance increases after the support plate 24 or the shape retaining portion 26 of the pressing portion 20 is contacted, .

 The damping members 42 and 44 can be fixed to the body 10 by the fixing part 60 of the press-fitting type.

6, 10, and 12, the fixing portion 60 includes a recessed groove portion 62 formed in the damping member 42, 44 or the body 10, And a fitting protrusion 64 protruding from the body 10 or the damping members 42 and 44.

The damping members 42 and 44 can be firmly fixed to the body 10 as the fitting projection portion 64 is fitted into the humping groove portion 62 in a press fitting manner.

11 and 12, the damper unit 40 includes a cylindrical circular rubber tube type damping member 42 surrounding the outside of the spring 30, a rubber rod type The damping member 44 may be formed at the same time.

The spacing portion 46 includes a first spacing portion 46a formed between the damping member 42 of the round rubber tube shape provided on the outer side of the spring 30 and the support plate 24 of the pressing portion 20, A second spacing portion (not shown) formed between the rubber rod-shaped damping member 44 provided at the inner side of the spring 30 and the shape retaining protrusion 26 of the pressing portion 20, 46b.

Here, the first spacing portion 46a is illustrated as having a smaller spacing interval than the second spacing portion 46b.

Since the first spacing 46a and the second spacing 46b are spaced apart from each other, the pressing portion 20 moves the spring 30 as much as the first spacing portion 46a and is primarily compressed, The damping member 42 and the spring 30 are secondarily compressed by the second spacing portion 46b so that the damping member 42 and the damping member 42 are moved further, The damping unit 40 may be configured to perform damping in three or more stages while the member 44 and the spring 30 are thirdarily compressed.

As described above, the impact and noise transmitted to the bearing 6 are firmly supported while the damper unit 40 is compressed in multiple stages as the displacement generation amount increases, so that the damping efficiency can be remarkably increased.

The clearance compensating apparatus 100 using the damper according to the embodiment of the present invention is capable of compensating for vibration by using the damping force of two or more stages such as the primary damping force of the spring 30 and the secondary damping force of the damper unit 40, So that the damping efficiency can be improved while providing a simple structure.

The present invention is also characterized in that a spacing portion 46 having a predetermined gap is formed between the damping members 42 and 44 and the pressing portion 20 so that the primary damping force by the spring 30 and the primary damping force by the spring 30 and damping The difference in damping force can be clearly defined by separately utilizing the secondary damping force for the members (42, 44).

Further, by applying the damping members (42, 44) as a soft material, the mechanical impact sound of the spring can be effectively blocked and the steering feeling can be improved.

Further, according to the present invention, the damping force can be greatly increased according to the movement amount by forming the narrow portion 50 at the end of the damping members 42 and 44.

Further, according to the present invention, the body 10 and the damping members 42 and 44 can be firmly fixed to each other by using the fixing portion 60.

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.

Accordingly, the true scope of protection of the present invention should be defined by the following claims.

10: Body 12:
14: through hole 15: recessed groove
16: retaining member 17: polygonal head
18: threaded portion 20:
22: pressing rod 24:
26: shape maintaining protrusion 30: spring
40: damper portion 42, 44: damping member
46: separation part 46a: first separation part
46b: second spacing portion 48:
50: narrower portion 60: fixed portion
62: depression groove portion 100:

Claims (8)

A body installed in the housing of the housing and having a space therein;
A pressing portion movably installed in the space portion of the body and pressing the outer peripheral surface of the bearing;
A spring installed in the space portion to provide a damping force to the pressing portion; And
And a damper part provided in a space of the body to provide an additional damping force to an outer circumferential surface of the bearing,
The damper unit may include a damping member of a soft material provided on at least one of an outer side and an inner side of the spring; And
And a spacing part spaced apart from the damping member by a predetermined distance from a support plate or a shape retaining protrusion provided on the pressing part,
Wherein the damping member is a circular rubber tube that surrounds the outside of the spring,
Wherein the bottom surface of the damping member is formed with a bottom plate which is supported by the bottom of the space while receiving the spring,
Wherein the bottom plate is provided with a guide protrusion inserted into a center portion of the spring to guide a linear movement position of the spring.
The method according to claim 1,
Wherein the space portion is open to the front side of the body,
The body has a recessed groove formed in a front inner circumferential surface of the space portion,
Wherein the recessed groove portion is provided with a snap ring member for preventing the pressing portion from being released,
And a washer member is provided between the retaining member and the pressing portion.
delete delete delete The method according to claim 1,
Wherein the damping member is fixed to the bottom of the space of the body to provide additional damping force to the pressing portion while the spring is contracted first by the spacing by the flow and impact of the pressing portion, A play compensating device using a rubber damper.
The method according to claim 1,
The spacing portion
A first spacing portion formed between the support plate and the damping member having a circular rubber tube shape provided on the outer side of the spring; And
And a second spacing portion formed between the shape retaining protrusion and a rubber rod-shaped damping member provided at an inner side of the spring with a different spacing from the first spacing portion. .
8. The method of claim 7,
The damping member is formed with a narrow portion that becomes narrower toward the end,
Wherein the damping member is fixed to the bottom of the space of the body by a fixing portion,
The fixing portion may include: a recessed groove portion formed on the damping member or the body; And
And a fitting protrusion protruding from the body or the damping member to be press-fitted into the recessed groove.

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