KR102187452B1 - Rack support device for power steering system - Google Patents

Abstract

A rack support device for a power steering system is disclosed. The rack support device for a power steering system according to an embodiment of the present invention is installed through a yoke housing having one end integrally connected to the rotary valve at a position where the pinion of the lower end passing through the center of the rotary valve engages with the rack bar. A rack support device for a power steering system that supports the rack bar so that the pinion and the rack bar are engaged, wherein the rack support device is mounted so as to reciprocate and slide from the inside of the yoke housing toward the rack bar, and one surface thereof is a rear surface of the rack bar and a yoke seat. A rack support yoke in surface contact through; A yoke plug inserted into the yoke housing with one end in contact with the other surface of the rack support yoke; A first elastic member interposed between the rack support yoke and the yoke plug; A support plug mounted on the open other end of the yoke housing; A rotating plug screwed into the inner side of the support plug inserted into the yoke housing, and having a protrusion formed in the center contacting the yoke plug; And a second elastic member interposed between the support plug and the rotation plug.

Description

Rack support device for power steering system {RACK SUPPORT DEVICE FOR POWER STEERING SYSTEM}

The present invention relates to a rack support device for a power steering system, and more particularly, a rack support device for a power steering system that prevents an increase in the clearance of the rack support yoke due to abrasion of a yoke seat, thereby improving rattle noise and steering feel. It is about.

In general, a steering system for a vehicle is provided to change the driving direction of the vehicle, and is connected to the steering wheel provided in the driver's seat, the steering shaft provided below the steering shaft, and the steering shaft to reduce the rotational force and simultaneously switch the power transmission direction. It is provided with a gearbox and the like.

Here, in the gearbox, a piston is built into the cylinder, and a rack bar is formed in the center of the piston to extend to both outer sides of the cylinder and interlocked with the piston, and between both sides of the cylinder bisected by the piston and the rotary valve, When the hydraulic pipe of is connected and hydraulic pressure is supplied to one cylinder through the rotary valve, the hydraulic pressure of the other cylinder is discharged.

In addition, a rack support device for supporting the rack bar so that the rack bar and the pinion can engage with the rack bar is provided at a portion where the pinion at the lower end passes through the center of the rotary valve and engages with the rack bar.

Here, the rack support device according to the prior art is configured to elastically support the rear portion of the rack bar while the pinion of the valve shaft penetrating the center of the rotary valve is engaged with the rack of the rack bar.

To this end, the conventional rack support device has a yoke sheet that is formed in the same curved surface as the rear curved surface of the rack bar and is in contact with the rear surface of the rack bar to support it, a rack support yoke that supports the yoke sheet from the rear side, and a rack support yoke. By including an elastic member that elastically pushes from the rear side, a support plug screwed to the yoke housing to support the elastic member from the rear side, and a lock nut to prevent the support plug from being loosened by vibration, etc. , The rack bar is supported by the elastic force of the elastic member.

However, in the conventional rack support device for a power steering system as described above, when the yoke sheet provided in the rack support yoke is worn, the amount of flow of the rack support yoke increases inside the yoke housing, and the yoke during rapid operation of the rack bar The support plug fixed to the housing and the rack support yoke flowing in the yoke housing collide with each other to generate rattle noise, thereby reducing product reliability and increasing field claims.

In addition, in the case of minimizing the clearance between the rack support yoke and the support plug in consideration of the amount of wear on the yoke seat during the initial manufacture of the rack support device, the steering feel decreases and stick slip as the initial operating friction of the steering gear increases. As noise is generated and the amount of wear of the yoke seat increases, the overall marketability of the power steering system is deteriorated.

The matters described in this background are prepared to enhance an understanding of the background of the invention, and may include matters other than those of the prior art known to those of ordinary skill in the field to which this technology belongs.

Accordingly, the present invention was invented to solve the above-described problems, and the problem to be solved by the present invention is to apply a yoke plug and increase the clearance between the rack support yoke and the yoke plug when the yoke sheet is worn. By preventing this, it is intended to provide a rack support device for a power steering system that prevents the occurrence of rattle noise due to collision between the rack support yoke and the yoke plug, and minimizes friction through reduction of shaft weight to improve steering feel.

A rack support device for a power steering system according to an embodiment of the present invention for achieving this object is a yoke formed such that one end is integrally connected to the rotary valve at a position where the pinion of the lower end passing through the center of the rotary valve is engaged with the rack bar. A rack support device for a power steering system installed through a housing to support the rack bar so that the pinion and the rack bar are engaged, wherein the rack support device is mounted so as to be reciprocated and slid toward the rack bar from the inside of the yoke housing, and one side is the rack A rack support yoke in surface contact with the rear of the bar through the yoke sheet; A yoke plug inserted into the yoke housing with one end in contact with the other surface of the rack support yoke; A first elastic member interposed between the rack support yoke and the yoke plug; A support plug mounted on the other open end of the yoke housing; A rotating plug screwed into the inner side of the support plug inserted into the yoke housing and having a protrusion formed in the center contacting the yoke plug; And a second elastic member interposed between the support plug and the rotation plug, wherein the yoke plug includes a plurality of gap maintaining members formed in a fan shape; And an O-ring that is mounted by interconnecting the outer surfaces of the gap maintaining members so as to form a disk shape in a state in which the gap maintaining members are coupled to each other, and contacting the other surface of the rack support yoke.

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The yoke plug may have an insertion hole formed in a center corresponding to the protrusion in a state in which the gap maintaining members are mutually coupled so that the protrusion is inserted.

When the protrusion is moved forward when the rotation plug is rotated, the gap maintaining members may have an outer circumferential surface moving toward the inner circumferential surface of the yoke housing with respect to the center of the insertion hole by the protrusion inserted into the insertion hole.

The O-ring may form a gap between the rack support yoke and the yoke plug.

The support plug may be mounted with a fixing plate at one end inserted into the yoke housing so as to support the other end of the yoke plug while preventing separation of the rotation plug.

The fixing plate may have an inclined surface in which one surface in contact with the other end of the yoke plug is inclined upward from the center toward the outer peripheral surface.

The gap maintaining members are moved to the inner circumferential surface of the yoke housing along the inclined surface while the other surface is in contact with the inclined surface of the fixing plate, when the protrusion moves forward, and is advanced by a predetermined amount to press the first elastic member. do.

The fixing plate may have a through hole formed in a center corresponding to the protrusion.

One end of the second elastic member is fixed to a first fixing part formed in the center of the inner surface of the support plug, and the other end is fixed to a second fixing part formed in the center of the inner surface of the rotation plug, and twisted from the support plug to the rotation plug. It may be formed of a torsion spring that provides an elastic force by.

The protrusion may be formed in a conical shape whose diameter increases from one end in contact with the yoke plug to the other end toward the support plug.

The first elastic member may have one end supported inside the other surface of the rack support yoke, and the other end may be formed of a coil spring supported on one surface of the yoke plug.

As described above, according to the rack support device for a power steering system according to an embodiment of the present invention, by applying a yoke plug and preventing an increase in the clearance between the rack support yoke and the yoke plug when the yoke sheet is worn, the rack There is an effect of reducing field claims by preventing the occurrence of rattle noise due to collision between the support yoke and the yoke plug.

In addition, in consideration of the wear of the yoke seat, it is possible to always maintain the initially set clearance without minimizing the clearance between the rack support yoke and the yoke plug as in the prior art, thereby reducing friction by reducing the axial weight of the rack support yoke transmitted to the rack bar. By minimizing it, the steering feel can be improved, and further, there is an effect of improving the overall marketability of the power steering system.

1 is a block diagram of a power steering system to which a rack support device for a power steering system according to an embodiment of the present invention is applied.
2 is a cross-sectional view taken along line AA of FIG. 1 and is a cross-sectional view of a rack support device for a power steering system according to an embodiment of the present invention.
3 is a perspective view of a yoke plug applied to a rack support device for a power steering system according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, since the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention, they can be replaced at the time of application. It should be understood that there may be various equivalents and variations.

In order to clearly describe the present invention, parts irrelevant to the description have been omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

Since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to what is shown in the drawings, and the thickness is enlarged to clearly express various parts and regions.

And throughout the specification, when a certain part "includes" a certain component, this means that other components may be further included rather than excluding other components unless otherwise stated.

In addition, terms such as "...unit", "...means", "...part" and "...member" described in the specification refer to a unit of a comprehensive constitution that performs at least one function or operation. it means.

1 is a configuration diagram of a power steering system to which a rack support device for a power steering system according to an embodiment of the present invention is applied, and FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and power steering according to an embodiment of the present invention A cross-sectional view of a system rack support device, and FIG. 3 is a perspective view of a yoke plug applied to a rack support device for a power steering system according to an embodiment of the present invention.

First, the power steering system to which the rack support device 100 for a power steering system according to an embodiment of the present invention is applied is basically, as shown in FIG. 1, a piston capable of sliding left and right inside the cylinder 2 (4) is built-in, and on both sides of the center of the piston (4) is formed with a rack bar (6) interlocked with the piston (4).

Each hydraulic pipe 10 is connected between the hydraulic chambers on both sides of the cylinder 2 divided by the piston 4 and the rotary valve 8, and when hydraulic pressure is supplied to one cylinder through the rotary valve 8, It is configured to discharge the hydraulic pressure of the other cylinder.

In addition, the pinion 12 formed at the lower end of the valve shaft penetrating the center of the rotary valve 8 is at a position where the rack bar 6 and the pinion 12 are engaged with the rack bar 6 and the pinion 12 to have a certain pressure. A rack support device 100 according to the present embodiment for supporting the rack bar 6 is provided to maintain the engaged state.

In the power steering device configured as described above, the rack support device 100 according to the embodiment of the present invention is at a position where the pinion 12 at the lower end passing through the center of the rotary valve 8 is engaged with the rack bar 6. The rotary valve 8 is installed through a yoke housing 102 having one end integrally connected to the rotary valve 8 so that the pinion 12 is engaged with the rack 14 of the rack bar 6. It is configured to support the rear surface with elastic force.

Here, the rack support device 100 according to the embodiment of the present invention, as shown in Figure 2, the rack support yoke 104, the yoke plug 110, the first elastic member 116, the support plug 118 ), a rotation plug 120, and a second elastic member 128.

First, the rack support yoke 104 is mounted so as to reciprocate and slide from the inside of the yoke housing 102 toward the rack bar 6, and one surface thereof is the rear surface of the rack bar 6 and the yoke sheet 106 ) Through the surface contact.

The rack support yoke 104 may have a mounting groove 108 formed in the center of the rear.

In this embodiment, one end of the yoke plug 110 is in contact with the other surface of the rack support yoke 104 inside the yoke housing 102.

Further, the first elastic member 116 is interposed between the rack support yoke 104 and the yoke plug 110.

Here, the first elastic member 116 has one end supported on the inner surface of the mounting groove 108 of the rack support yoke 104, and the other end may be formed of a coil spring supported on one surface of the yoke plug 110. have.

Meanwhile, in this embodiment, the yoke plug 110 includes a plurality of gap holding members 112 and O-rings 114 as shown in FIG. 3.

First, the gap maintaining members 112 are formed in a fan shape by dividing one disk at a set angle, and in this embodiment, when eight divided at a 45° angle are divided and combined with each other, they form a single disk shape. .

Here, in the present embodiment, it is described as an example that the gap maintaining members 112 are composed of eight, but is not limited thereto, and the number of the gap maintaining members 112 is greater than or equal to eight. It can be applied by changing the number of dogs less.

In addition, the O-ring 114 is mounted by interconnecting the outer sides of the gap maintaining members 112 so as to maintain a disc-shaped state in a state in which the gap maintaining members 112 are coupled to each other, and the gap maintaining member 112 A portion protruding from the outside of) is in contact with the other surface of the rack support yoke 104.

Here, the O-ring 114 may be made of a rubber material having elasticity, and may be manufactured integrally through injection molding or the like.

In addition, the O-ring 114 forms a gap D between the rack support yoke 104 and the yoke plug 110.

In this embodiment, the support plug 118 is mounted on the opposite side of the rack bar 6 which is the other open end of the yoke housing 102.

The support plug 118 may be fixed to the other end of the yoke housing 102 through screwing.

In this embodiment, the rotation plug 120 is screwed into the inner side of the support plug 118 inserted into the yoke housing 102, and the protrusion 122 formed in the center contacts the yoke plug 110 do.

Here, the protrusion 122 may be formed in a conical shape whose diameter increases from one end contacting the yoke plug 110 to the other end toward the support plug 118.

On the other hand, the yoke plug 110 is in a state in which the gap maintaining members 112 are mutually coupled through the O-ring 114 so that the protrusion 122 is inserted to form a disk shape, and the protrusion 122 An insertion hole 115 may be formed in a corresponding center.

In addition, the second elastic member 128 is interposed between the support plug 118 and the rotation plug 120.

One end of the second elastic member 128 is fixed to the first fixing part 124 formed in the center of the inner surface of the support plug 118, and the other end is a second fixing part formed in the center of the inner surface of the rotating plug 126. It may be formed of a torsion spring that is fixed to 126 and provides an elastic force by twisting from the support plug 118 to the rotation plug 120.

Here, the second elastic member 128 provides an elastic force due to torsion to the rotation plug 120 with respect to the support plug 118, so that the rotation plug 120 is moved inside the support plug 118. It is rotated.

Then, the rotation plug 120 may be moved forward toward the yoke plug 110 in the support plug 118.

Accordingly, when the rotation plug 120 is moved toward the yoke plug 110 while the rotation plug 120 is rotated, the gap maintaining members 112 are formed by the conical protrusion 122 inserted into the insertion hole 115. With respect to the center of the insertion hole 115, the outer circumferential surface may be opened while moving toward the inner circumferential surface of the yoke housing 102.

On the other hand, when the support plug 118 is rotated by the elastic force of the second elastic member 128 and moves forward toward the yoke plug 110, the rotation plug 120 The fixing plate 130 may be mounted at one end inserted into the yoke housing 110 to support the other end of the yoke plug 110 while preventing separation.

The fixing plate 130 may have an inclined surface 132 inclined upward from the center toward the outer peripheral surface of one surface in contact with the other end of the yoke plug 110.

In addition, the fixing plate 130 has a through hole 134 formed in the center corresponding to the protrusion, and the protrusion 122 moved toward the yoke plug 110 by rotation of the rotation plug 120 is fixed to the fixing plate ( 130) can be prevented.

In the rack support device 100 for a power steering system according to an embodiment of the present invention configured as described above, when the yoke sheet 106 is worn and the axial weight of the first elastic member 116 is reduced, the second The elastic member 128 rotates the rotation plug 120 screwed to the support plug 118 to move toward the yoke plug 110.

Then, the protrusion 122 of the rotation plug 120 is continuously moved forward while being inserted into the insertion hole 115 of the yoke plug 110, and at this time, each gap of the yoke plug 110 is maintained. The members 112 move while being opened toward the inner circumferential surface of the yoke housing 102 around the insertion hole 115.

Here, as the gap maintaining members 112 move toward the inner circumferential surface of the yoke housing 102 along the inclined surface 132 of the fixing plate 130 and move toward the rack support yoke 104, the first The elastic member 116 is pressed.

That is, the yoke plug 110 includes a first elastic member 116 in which the axial weight is reduced by the rotation plug 120 that is moved toward the yoke plug 110 through rotation. While compressing, it is moved to a position where the force is balanced.

Through this operation, the yoke plug 110 maintains the clearance D between the rack support yoke 104 and the yoke plug 110 with reduced axial weight at an initial set distance.

Therefore, when applying the rack support device 100 for a power steering system according to an embodiment of the present invention configured as described above, the yoke plug 110 is applied, and when the yoke sheet 106 is worn, the second elastic member The rotating plug 120 operated by 128 moves the gap-holding members 112 of the yoke plug 110 toward the first elastic member 116 through the inclined surface 132 formed on the fixing plate 130, The first elastic member 116 is pressed to become constant.

Accordingly, the rack support device 100 prevents an increase in the clearance D between the rack support yoke 104 and the yoke plug 110 and always maintains an initially set constant clearance, so that the rack support yoke 104 The occurrence of rattle noise due to collision between the and yoke plug 110 may be prevented in advance, thereby reducing field clash.

In addition, in consideration of the wear of the yoke sheet 106, it is possible to always maintain the initial set clearance (D) without minimizing the clearance (D) between the rack support yoke 104 and the yoke plug 110 as in the prior art, By reducing the axial weight of the rack support yoke 104 transmitted to the rack bar 6, friction can be minimized to improve the steering feel, and further, the overall marketability of the power steering system can be improved.

As described above, although the present invention has been described by the limited embodiments and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the following by those of ordinary skill in the technical field to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equivalent range of the claims to be described.

100: rack support device 102: yoke housing
104: rack support yoke 106: yoke sheet
108: mounting groove 110: yoke plug
112: gap holding member 114: O-ring
116: first elastic member 118: support plug
120: rotating plug 122: protrusion
124: first fixing part 126: second fixing part
128: second elastic member 130: fixing plate
132: slope 134: through hole

Claims (12)

Power steering system that is installed through a yoke housing formed such that one end is integrally connected to the rotary valve at a position where the pinion of the lower end passing through the center of the rotary valve is engaged with the rack bar, and supports the rack bar so that the pinion and the rack bar are engaged In the rack support device for,
A rack support yoke mounted in the yoke housing so as to be reciprocally slidably moved toward the rack bar, and having one surface in contact with the rear surface of the rack bar through a yoke sheet;
A yoke plug inserted into the yoke housing with one end in contact with the other surface of the rack support yoke;
A first elastic member interposed between the rack support yoke and the yoke plug;
A support plug mounted on the other open end of the yoke housing;
A rotating plug screwed into the inner side of the support plug inserted into the yoke housing and having a protrusion formed in the center contacting the yoke plug; And
A second elastic member interposed between the support plug and the rotation plug;
Including,
The yoke plug is
A plurality of gap holding members formed in a fan shape; And
O-rings are mounted by interconnecting the outer surfaces of the gap maintaining members to form a disk shape in a state in which the gap maintaining members are mutually coupled, and contacting the other surface of the rack support yoke;
Rack support device for a power steering system comprising a. delete The method of claim 1,
The yoke plug is
A rack support device for a power steering system, characterized in that an insertion hole is formed in a center corresponding to the protrusion in a state in which the gap maintaining members are mutually coupled so that the protrusion is inserted. The method of claim 3,
The gap maintaining members
Rack for a power steering system, characterized in that when the rotation plug is rotated and the protrusion is moved forward, an outer circumferential surface is moved toward an inner circumferential surface of the yoke housing based on the center of the insertion hole by the protrusion inserted into the insertion hole. Support device. The method of claim 1,
The O-ring
A rack support device for a power steering system, characterized in that a clearance is formed between the rack support yoke and the yoke plug. The method of claim 1,
The above support plug
A rack support device for a power steering system, characterized in that a fixing plate is mounted on one end inserted into the yoke housing to support the other end of the yoke plug while preventing the rotation plug from being separated. The method of claim 6,
The fixing plate is
A rack support device for a power steering system, characterized in that one surface in contact with the other end of the yoke plug has an inclined surface inclined upward from the center toward the outer peripheral surface. The method of claim 7,
The gap maintaining members
In a state in which the other surface is in contact with the inclined surface of the fixing plate, when the protrusion moves forward, while moving along the inclined surface toward the inner circumferential surface of the yoke housing, it is advanced by a certain amount to press the first elastic member. Rack support device. The method of claim 6,
The fixing plate is
Rack support device for a power steering system, characterized in that the through hole is formed in the center corresponding to the protrusion. The method of claim 1,
The second elastic member
One end is fixed to a first fixing part formed in the center of the inner surface of the support plug, and the other end is fixed to a second fixing part formed in the center of the inner surface of the rotating plug to provide elastic force by twisting from the support plug to the rotating plug. Rack support device for a power steering system, characterized in that formed of a torsion spring. The method of claim 1,
The protrusion
A rack support device for a power steering system, characterized in that it is formed in a conical shape whose diameter increases from one end in contact with the yoke plug toward the other end toward the support plug. The method of claim 1,
The first elastic member
A rack support device for a power steering system, wherein one end is supported inside the other surface of the rack support yoke, and the other end is formed of a coil spring supported on one surface of the yoke plug.

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