WO2017204493A1

WO2017204493A1 - Apparatus for preventing loosening and separation of pinion plug of steering assembly, and rack and pinion type steering assembly comprising same

Info

Publication number: WO2017204493A1
Application number: PCT/KR2017/005220
Authority: WO
Inventors: 방희성; 박세정; 정명철; 이청신
Original assignee: 이래오토모티브시스템 주식회사
Priority date: 2016-05-24
Filing date: 2017-05-19
Publication date: 2017-11-30
Also published as: KR101734079B1; WO2017204493A8

Abstract

Disclosed are an apparatus for preventing loosening and separation of a pinion plug of a steering assembly, and a rack and pinion type steering assembly comprising the same. An apparatus for preventing loosening and separation of a pinion plug in a rack and pinion type steering assembly, according to one embodiment of the present invention, comprises: a cylindrical pinion assembly part integrally provided on one side of a rack housing and having an opened upper portion formed with an internal thread on an inner circumferential surface thereof; a plurality of caulking grooves formed along the circumferential direction on an upper portion of the internal thread; a pinion plug having an external thread corresponding to the internal thread formed on the outer circumferential surface thereof so as to be screwed to the pinion assembly part, wherein a solid adhesive is applied to the external thread at a certain thickness; a caulking frame which is formed at an arbitrary height along the upper outer edge of the pinion plug on the external thread top, and which forms a stopper engaging with the caulking groove by plastic deformation of a part of the caulking edge toward the caulking groove after the threads are screwed, wherein the caulking groove is composed of a first direction groove on one side and a second direction groove on the other side with respect to an inflection point (I) which is the farthest from the center (C) of the pinion assembly part, and the inclination of the second direction groove is formed gently compared with the inclination of the first direction groove.

Description

Pinion-unlocking and drop-off device for steering assembly, rack and pinion type steering assembly

The present invention relates to a pinion plug loosening and release prevention device of a steering assembly, and more particularly to a steering pin which prevents the pinion plug of the steering assembly from being unwound or detached from the rack housing by vibration input through a wheel when the vehicle is driven. Pinion plug loosening and release prevention device of the assembly, and a rack and pinion type steering assembly comprising the same.

As a device for arbitrarily changing the traveling direction of the vehicle, a steering device is applied to a vehicle. The steering apparatus generally includes a steering control mechanism for transmitting a steering force of a steering wheel (steering handle) by a driver to a gearbox, a steering gear mechanism for converting a rotational movement of the steering control mechanism into a linear movement, and a movement of the steering gear mechanism. It consists of a steering link mechanism and the like to transmit to the front wheel of the.

The steering mechanism includes a steering shaft to which the steering wheel is connected and a steering column unit surrounding the steering wheel, and the steering gear mechanism is connected to the steering shaft by a connection medium such as a wide-angle joint to rotate the pinion shaft and the pinion shaft. Rack bar for converting the rotary motion to linear motion, and a gear box consisting of a rack housing surrounding the rack bar.

1 shows a steering gear assembly of a conventional steering apparatus applied to an automobile.

Referring to FIG. 1, the gearbox 1 includes a rack housing 10 having a hollow hollow tube structure. In the rack housing 10, a rack bar 12 having a rack gear formed over a portion of the rack housing 10 is installed to be linearly movable in the axial direction of the rack housing 10, and the rack gear 10 in the rack housing 10. A pinion shaft 14 having pinion gears (not shown) engaged in axial engagement is rotatably coupled to the rack housing 10 via the pinion assembly 11.

A steering shaft (not shown) to which a steering wheel is coupled is connected to the pinion shaft 14 by a connection medium such as a wide-angle joint, so that the pinion shaft 14 rotates by a rotational manipulation force of the steering wheel by a driver. The rotational movement of the pinion shaft 14 is converted to the linear movement of the rack bar 12 in the rack housing 10 and then output as steering force for steering the front wheels through the rack bar 14.

FIG. 2 is an enlarged view of part 'A' of FIG. 1.

As shown in FIG. 2, a substantially annular pinion plug 13 having a hole in the center is assembled through the upper opening of the pinion assembly portion 11. The pinion plug 13 fixes the pinion shaft 14 assembled so that a part thereof is located in the rack housing 10 on the rack housing 10 side to support a stable rotational movement, and at the same time the rack housing 10 ) To prevent the pinion shaft 14 from being separated.

The pinion plug 13 is fixed to the pinion assembly 11 by screwing. At this time, in order to prevent any loosening and detachment of the pinion plug 13, conventionally, by applying a liquid or solid adhesive to the screw portion of the outer main surface of the pinion plug 13 before screwing, and then fastening to the pinion assembly 11 The pinion plug 13 is not loosened or detached arbitrarily even in a vehicle vibration.

However, liquid or solid adhesives alone have limitations to reliably prevent the pinion plugs from loosening and thereby disengaging. In the case of the liquid adhesive, there is a disadvantage in that the adhesive strength is lowered due to uncured application due to uneven application, and the solid adhesive has a problem in that the fastening force is not uniform due to partial dropping or peeling during the screw fastening process, and thus is vulnerable to repeated vibrations. .

The technical problem to be solved by the present invention, the pinion plug loosening and release prevention device of the steering assembly, which can reliably prevent the pinion plug from being arbitrarily released or detached from the rack housing even in the case of repeated vibration, and a rack comprising the same The aim is to provide an pinion type steering assembly.

According to one aspect of the present invention as a means for solving the problem,

A pinion shaft for rotating by the steering shaft, a rack bar for changing the steering wheel by converting the rotation of the pinion shaft into a linear movement, a rack housing surrounding the rack bar, and a pinion plug for fixing the pinion shaft to the rack housing. In the rack and pinion type steering assembly,

A cylindrical pinion assembly provided integrally on one side of the rack housing and having an open upper portion formed with a female thread on an inner main surface thereof;

Caulking groove (Caulking groove) formed in the singular or circumferential direction in the upper portion of the female thread;

A pinion plug in which a male thread is formed on an outer main surface of the pinion assembly to correspond to the female thread, and a liquid or solid adhesive is applied to the male thread in a predetermined thickness or a variable thickness; And

Pinion plugs of the steering assembly including; a pinning plug formed at an arbitrary height along the upper outer edge of the pinion plug upper portion of the male thread, and partly plastically deformed toward the caulking groove after screwing to form a stopper for engaging the caulking groove. Provides a release and release prevention device.

In an embodiment according to an aspect of the present invention, the caulking groove includes a first direction groove on one side and a second direction groove on the other side with respect to the inflection point I farthest from the center C of the pinion assembly portion. The second direction groove may be formed to have a larger radius of curvature than the first direction groove.

In an embodiment according to an aspect of the present disclosure, the first direction may be a direction in which the pinion plug is screwed to the pinion assembly, and the second direction may be opposite to a direction in which the pinion plug is screwed to the pinion assembly. have.

Preferably, the first direction may be a clockwise (CW) direction when the pinion assembly is viewed in plan view, and the second direction may be a counterclockwise (CCW) direction when the pinion assembly is viewed in plan view.

In addition, the caulking groove may be formed over a predetermined interval at a pitch of 90 되거나 relative to the center C of the pinion assembly portion, or may be formed in four places over an uneven interval.

In addition, in an embodiment according to an aspect of the present invention, the first directional groove has an arc point of curvature at an arbitrary point C1 on the centerline L1 passing through the inflection point I and a radius of curvature R1. It may be a curved groove formed in an area overlapping the inner main surface of the pinion assembly.

In this case, the C1 may be positioned on the center line L1 passing through the inflection point I between the center C of the pinion assembly part and the inner main surface.

Preferably, the C1 may be formed at the intersection where the circle defining the center line L1 and the effective diameter D1 of the female screw thread formed on the inner main surface meet.

Here, the effective diameter D1 may be 38 to 40 mm.

In addition, the radius of curvature R1 of the first direction groove may be 1/7 to 1/6 of the distance D1 / 2 from the center C of the pinion assembly portion to the C1.

Further, in an embodiment according to an aspect of the present invention, the second directional groove has an arc point of curvature at an arbitrary point C2 on the centerline L1 passing through the inflection point I, and has a radius of curvature R2. It may be a curved groove formed in an area overlapping the inner main surface of the pinion assembly.

In this case, the C2 may be positioned on the center line L1 passing through the inflection point I between the center C of the pinion assembly part and the inner main surface.

Preferably, the C2 may be located on the center line L1 between the center of curvature C1 of the first direction groove existing on the center line L1 and the center C of the pinion assembly portion.

Also, the distance D2 / 2 from the center C of the pinion assembly part to C2 may be 4/5 to 6/7 of the distance D1 / 2 from the center C of the pinion assembly part to the C1. .

In addition, the radius of curvature R2 of the second direction groove may be 1/3 to 2/5 of the distance D2 / 2 from the center C of the pinion assembly portion to the C2.

In addition, a round may be formed at an edge of each caulking groove where the circle defining the second direction groove and the circle diameter D3 of the female thread meet.

At this time, the radius of curvature of the round (Round) is preferably 295 to 305mm.

As another example, a portion in which the round is formed may be formed of a softer material than other portions.

In another embodiment according to an aspect of the present invention, the second directional groove has an arc point of curvature at an arbitrary point C3 on the centerline L1 passing through the inflection point I, and has a radius of curvature R3. It may be a curved groove formed in an area overlapping the inner main surface of the pinion assembly.

Here, the C3 may be positioned on the center line L1 passing through the inflection point I between the center C of the pinion assembly portion and the inner main surface.

Preferably, the C3 may be located on the center line L1 between the center of curvature C1 of the first direction groove existing on the center line L1 and the center C of the pinion assembly.

Also, the distance D4 / 2 from the center C of the pinion assembly part to C3 may be 1/4 to 2/7 of the distance D1 / 2 from the center C of the pinion assembly part to the C1. .

In another preferred embodiment, the radius of curvature R3 of the second direction groove may be 3 to 3.3 times the distance (D4 / 2) from the center (C) of the pinion assembly portion to the C3.

As another preferred example, the female thread of the pinion assembly portion is composed of a two-stage thread including a first female thread and a second female thread having a diameter larger than that of the first female thread, and the male thread of the pinion plug further includes the first female thread. It may be composed of a two-stage screw thread comprising a first male thread screwable to the second male thread and a second male thread screwable to the second female thread.

In this case, the diameters of the second female thread and the second male thread may be 0.25 to 0.35 mm larger than the diameters of the first female thread and the first male thread.

According to another aspect of the present invention as a means for solving the problem, it provides a rack and pinion type steering assembly comprising a pinion plug loosening and release prevention device according to the above aspect.

According to an embodiment of the present invention, with the solid adhesive applied to the side surface (threaded surface) of the pinion plug, after screwing, a portion of the pinion plug (part of the caulking edge of the upper edge) is screwed into the caulking groove direction of the pinion assembly. The application of a caulking structure that engages plastically deforms to reliably prevent loosening and disengaging of the pinion plug to the rack housing.

In addition, the caulking groove formed on the inner main surface of the pinion assembly portion is formed in a gentle curve having a relatively large radius of curvature in the direction in which the pinion plug is fastened. As a result, the pinion plug can be easily fastened and the resistance to the release direction after the caulking can be increased.

In addition, by applying a round shape with a large radius of curvature to the corner portion where the caulking groove of the inner surface of the pinion assembly meets the female thread with respect to the fastening direction of the pinion plug, interference with the female thread on the pinion assembly side when the pinion plug is fastened. This can be avoided as much as possible, so that the solid adhesive applied to the pinion plug can be prevented from peeling off or falling off when the pinion plug is fastened.

In addition, according to another embodiment of the present invention of the two-stage screw structure, it is possible to further increase the clamping force of the pinion plug to the pinion assembly portion to more reliably prevent the loosening and detachment of the plug, the female thread of the pinion plug entry side By forming a relatively large diameter compared to the lower portion, it is possible to minimize the falling off or peeling of the solid adhesive due to the interference between the threads during the fastening process.

1 is a perspective view of a steering box (steering gear assembly) of the conventional steering apparatus.

2 is an exploded perspective view illustrating an enlarged portion 'A' of FIG. 1.

Figure 3 is a perspective view showing the separation of the pinion plug loosening and release prevention device of the steering assembly according to an embodiment of the present invention.

Figure 4 is an enlarged perspective view of the pinion plug shown in FIG.

FIG. 5 is a plan view of the pinion assembly shown in FIG. 3 as viewed from above the opening; FIG.

6 is a plan view of the pinion assembly assembled with the pinion plug.

7 is a cross-sectional view taken along the line A-A of FIG.

Figure 8 is a plan view showing a preferred embodiment of the pinion assembly with the caulking groove formed.

Figure 9 is a plan view showing another preferred embodiment of the pinion assembly with the caulking groove formed.

10 is a cross-sectional view of the pinion plug loosening and release prevention device of the steering assembly according to another embodiment of the present invention.

FIG. 11 is an enlarged view illustrating main parts of an enlarged view of part “B” of FIG. 10; FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

The terms "comprise" or "have" herein are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and that one or more other features It should be understood that it does not exclude in advance the possibility of the presence or addition of numbers, steps, operations, components, parts or combinations thereof.

In addition, terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In addition, the terms “… unit”, “… unit”, “… module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. Can be.

In the description with reference to the accompanying drawings, the same reference numerals are assigned to the same components, and duplicate description thereof will be omitted. In the following description of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

With reference to the accompanying drawings will be described in detail an embodiment of the present invention.

3 is a perspective view showing the pinion plug loosening and release prevention device of the steering assembly according to an embodiment of the present invention, Figure 4 is an enlarged perspective view of the pinion plug shown in FIG. FIG. 5 is a plan view of the pinion assembly shown in FIG. 3 as viewed from an upper side of the opening, and FIGS. 6 and 7 are cross-sectional views taken along line A-A of FIG. 6, respectively.

3 to 7, the embodiment of the present invention provides a release and release of the pinion plug 13 which fixes the pinion shaft 14 to the rack housing 10 (see FIG. 1) in the rack and pinion type steering assembly. As a device for prevention, the pinion assembly portion 11, the caulking groove 16 formed in the pinion assembly portion 11, the pinion plug 13 and the pinion plug 13 are screwed to the pinion assembly portion (11). And a caulking rim 18 formed.

As described above, the rack and pinion type steering assembly includes a rack bar 12 and a rack bar for converting a steering wheel by converting the rotational motion of the pinion shaft 14 and the pinion shaft 14 into a linear motion by the steering shaft. A gearbox 1 consisting of a rack housing 10 enclosing 12 and a pinion plug 13 for securing the pinion shaft 14 to the rack housing 10 (FIG. 1 and background part). Reference).

The rack housing 10 constituting the gear box has a hollow hollow tube structure, and the rack bar 12 having the rack gear formed therein in a portion of the rack housing 10 in the axial direction of the rack housing 10. The pinion shaft 14 has a pinion gear that is axially engaged with the rack gear in the rack housing 10. And the pinion shaft 14 is rotatably coupled to the pinion assembly 11 via the pinion plug 13.

As shown in FIGS. 3 to 7, the pinion plug 13 is screwed to the inside of the pinion assembly 11 through an upper opening of the pinion assembly 11 integrally formed on one side of the rack housing 10. do. A hole 135 is formed at the center of the pinion plug 13, which extends toward the rack housing 10 through the pinion shaft 14 and throttles with the rack bar in the rack housing 10. .

The pinion plug 13 fixes the pinion shaft 14 assembled so that a part thereof is located in the rack housing 10 on the rack housing 10 side to support a stable rotational movement, and at the same time the rack housing 10 It is a part that plays an important role in preventing the loss of steering force and the fatal safety accident resulting from the pinion shaft 14 departure by preventing the pinion shaft 14 from being separated.

The pinion assembly portion 11 to which the pinion plug 13 is fixedly coupled is formed in a cylindrical shape with an upper opening. An internal thread 110 having a predetermined screw pitch is formed on the inner main surface of the pinion assembly 11 for firmly screwing the pinion plug 13. In addition, a plurality of caulking grooves 16 are formed along the circumferential direction on the inner circumferential surface at a predetermined width and depth from an upper end of the female screw thread 110, preferably, at the beginning of the female screw thread 110. Is formed.

The pinion plug 13 is formed with a male thread 130 at a screw pitch corresponding to the female threaded thread 110 on the outer main surface thereof so as to be screwed to the pinion assembly portion 11. In addition, liquid or solid adhesives (Hot melt adhesives or Thermoplastic adhesives) are coated on the outer main surface on which the male thread acid 130 is formed to have a predetermined or variable thickness. At this time, the solid adhesive has a thermoplastic resin as a main component, and may be applied in a molten state through heating.

A caulking edge 18 is formed along the edge at an arbitrary height on the upper outer edge of the pinion plug 13 on the male thread 130. The caulking edge 18 may correspond to the width of the curved portion of the caulking groove 16 (W, see FIG. 6) or may be formed at a slightly smaller height. After completion of the fastening of the pinion plug 13, a caulking tool may be installed. Through the caulking operation, a part is plastically deformed toward the caulking groove 16.

The position where the caulking operation is performed may be a position corresponding to the caulking groove 16 (dashed line shown in FIG. 6) in a state where the pinion plug 13 is fastened to be fully screwed into the pinion assembly portion 11. , Part of the caulking edge 18 plastically deformed toward the caulking groove 16 by caulking operation constitutes a stopper that engages the caulking groove 16 (see FIG. 7), whereby the pinion plug 13 is unscrewed and released Can be prevented.

The caulking groove 16 is a curved groove formed by smoothly connecting the first direction grooves 16a and the second direction grooves 16b having different radii of curvature, and compared to the inclination of the first direction grooves 16a. The inclination of 16b) may be a gentle configuration. Preferably, it may be a curved groove in which the radius of curvature of the second direction groove 16b is larger than that of the first direction groove 16a. Reference will now be made to FIG. 8 for a preferred form of caulking groove 16.

FIG. 8 is a detailed plan view showing a preferred embodiment of the pinion assembly 11 in which the caulking groove 16 is formed.

Referring to FIG. 8, the caulking groove 16 may be a curved groove in which the first direction grooves 16a and the second direction grooves 16b having different radii of curvature are smoothly connected, as described above. Preferably, the first direction groove 16a formed at one side and the second direction groove 16b formed at the other side with respect to the inflection point I farthest from the center C of the pinion assembly portion 11 are provided. Can be a configuration that is smoothly connected into one.

The first direction may be a direction in which the pinion plug 13 is screwed to the pinion assembly 11, and the second direction may be a direction opposite to the direction in which the pinion plug 13 is screwed to the pinion assembly 11. have. Specifically, the first direction may be a clockwise (CW) direction when the pinion assembly portion 11 is viewed in a plan view, and the second direction may be a counterclockwise (CCW) direction when the pinion assembly portion 11 is viewed in a plan view. .

Compared to the first direction groove 16a (groove formed in the opposite direction to be screwed on the inflection point I), the second direction groove 16b (groove formed in the direction to be screwed on the inflection point I) is It can be formed into an arc-shaped curve having a larger radius of curvature, such a caulk groove 16 is formed at a pitch of 90 mm relative to the center (C) of the pinion assembly 11 or a total of four places at uneven intervals Can be formed on.

Of course, in accordance with the size of the pinion assembly portion 11 varies depending on the vehicle specification, the caulking groove 16 is formed in a total of six places spaced at a pitch of 60 ㅀ relative to the center C of the pinion assembly portion 11. Alternatively, various forms of deformation may be possible, such as a configuration in which the caulking grooves 16 are formed at a total of three locations so as to be spaced apart at a pitch of 120 mm based on the center C. That is, the number of caulking grooves 16 is not particularly limited.

Specifically, the first direction groove 16a has a curvature center at an arbitrary point C1 on the centerline L1 passing through the inflection point I, and an arcuate trajectory having a radius of curvature R1 has an inner circumferential surface of the pinion assembly 11. It may be a curved groove formed in the region overlapping with. In this case, C1 may be positioned on the center line L1 passing through the inflection point I between the center C of the pinion assembly 11 and the inner main surface of the pinion assembly 11.

More specifically, C1, which is the center of curvature of the first direction groove 16a, is a circle where the center line L1 and the circle dividing the effective diameter D1 of the female screw thread 110 formed on the inner main surface of the pinion assembly portion 11 meet each other. It may be formed at the intersection, where the effective diameter (D1) may be 38 to 40mm. The radius of curvature R1 of the first direction groove 16a may be 1/7 to 1/6 of the distance D1 / 2 from the center C of the pinion assembly portion 11 to the C1.

If the radius of curvature R1 of the first direction groove 16a is smaller than 1/7 of the distance D1 / 2 from the center C of the pinion assembly portion 11 to the C1, then the pinion plug 13 of the pinion plug 13 If it is difficult to sufficiently secure the binding force with the stopper 180 formed by the caulking rim 18, and the radius of curvature R1 is larger than 1/6 of the distance D1 / 2 from the center C to C1, the caulking rim ( This is because the caulking operation may be accompanied because 18) should be set higher.

The second direction groove 16b has a curvature center at an arbitrary point C2 on the centerline L1 passing through the inflection point I, and an arc trajectory having a radius of curvature R2 overlaps with the inner main surface of the pinion assembly portion 11. It may be a curved groove formed in the region to be. In this case, an arbitrary point C2 may be formed on the center line L1 passing through the inflection point I between the center C of the pinion assembly 11 and the inner main surface.

More specifically, C2, which is the center of curvature of the second direction groove 16b, is more specifically, the center of curvature C1 of the first direction groove 16a and the center C of the pinion assembly 11 that are present on the center line L1. It may be formed to be located on the center line (L1) between. At this time, the distance (D2 / 2) from the center (C) of the pinion assembly 11 to the C2 is 4/5 of the distance (D1 / 2) from the center (C) of the pinion assembly (11) to the C1. ˜6 / 7 is preferred.

The radius of curvature R2 of the second direction groove 16b may be 1/3 to 2/5 of the distance D2 / 2 from the center C of the pinion assembly portion 11 to the C2. That is, based on the radius of curvature R1 of the first direction groove 16a, the radius of curvature R2 of the second direction groove 16b may be approximately 1.7 to 2.2R1 (1.7 times to 2.2 times R1), and the curvature may be The center C2 may be formed on the center line L1 at a distance at which the radius of curvature R2 becomes 1.7 to 2.2R1.

This is because the radius of curvature R2 must be larger than R1 to prevent peeling or dropping of the solid adhesive applied to the male thread 130 of the pinion plug 13 when the pinion plug 13 is fastened. Peeling or dropping off of the solid adhesive can be effectively prevented, and if it exceeds 2.2R1, the work efficiency may be inferior since unnecessary cutting of a large portion is required for forming the second direction groove 16b.

Rounds (R) may be formed at the corners of the caulking grooves 16 where the circles defining the second diameter groove 16b and the circle diameter D3 of the female threaded thread 110 meet. That is, by applying a round (R) in the fastening direction of the pinion plug 13 to the caulking groove 16 of the pinion assembly 11, the interference with the female thread 110 is avoided when the pinion plug 13 is fastened. It is preferable to prevent peeling or dropping of the solid adhesive.

Here, the radius of curvature of the round (R) is preferably 295 to 305 mm, and when the portion of the round (R) is formed of a softer material than other portions, the solid adhesive when the pinion plug 13 is fastened Even if the coating thickness of the non-uniformity of the thicker than the other portions, even if the portion interfering with the round portion peeling or falling off of the solid adhesive can be minimized.

9 shows another preferred embodiment of the pinion assembly in which the caulking groove is formed.

Referring to FIG. 9, the caulking groove 16 applied to another embodiment may also be a curved groove formed by smoothly connecting the first direction grooves 16a and the second direction grooves 16b having different radii of curvature. Preferably, the first direction groove 16a formed at one side and the second direction groove 16b formed at the other side with respect to the inflection point I farthest from the center C of the pinion assembly portion 11 are provided. Can be a configuration that is smoothly connected into one.

Compared to the first direction groove 16a (groove formed in the opposite direction to be screwed on the inflection point I), the second direction groove 16b (groove formed in the direction to be screwed on the inflection point I) is The caulking groove 16 may be formed to be spaced at a pitch of 90 ㅀ with respect to the center C of the pinion assembly 11 to be formed at a total of four places. Can be.

Similarly to the exemplary embodiment, the first direction groove 16a has an arbitrary point C1 on the center line L1 passing through the inflection point I as the center of curvature, and an arc trajectory having a radius of curvature R1 is the pinion assembly portion 11. It may be a curved groove formed in a region overlapping with the inner main surface of the, C1 is passing through the inflection point (I) between the center (C) of the pinion assembly 11 and the inner main surface of the pinion assembly (11). It may be located above the center line L1.

More specifically, C1, which is the center of curvature of the first direction groove 16a, is formed at an intersection where the circle which divides the center line L1 and the circle dividing the effective diameter D1 of the female thread formed on the inner main surface of the pinion assembly portion 11 meets. Can be. In this case, the effective diameter D1 may be 38 to 40 mm. The radius of curvature R1 of the first direction groove 16a may be 1/7 to 1/6 of the distance D1 / 2 from the center C of the pinion assembly portion 11 to the C1.

In the present embodiment, the second direction groove 16b has an arbitrary point C3 on the centerline L1 passing through the inflection point I as the center of curvature, and an arc trajectory having a radius of curvature R3 is the pinion assembly portion 11. It may be a curved groove formed in a region overlapping the inner main surface of the. In this case, an arbitrary point C3 may be formed on the center line L1 passing through the inflection point I between the center C of the pinion assembly 11 and the inner main surface.

More specifically, C3, which is the center of curvature of the second direction groove 16b, is more specifically, the center of curvature C1 of the first direction groove 16a and the center C of the pinion assembly 11 that exist on the center line L1. It may be formed to be located on the center line (L1) between. At this time, the distance (D4 / 2) from the center (C) of the pinion assembly 11 to the C3 is 1/4 of the distance (D1 / 2) from the center (C) of the pinion assembly (11) to the C1. ˜2 / 7 is preferred.

The radius of curvature R3 of the second direction groove 16b may be 3 to 3.3 times the distance D4 / 2 from the center C of the pinion assembly 11 to the C3. Based on the radius of curvature R1 of the first direction groove 16a, the radius of curvature R3 of the second direction groove 16b may be formed to be approximately 5 to 6R1 (five to six times R1), and the center of curvature C3. May be formed on a center line L1 of a distance at which the radius of curvature R3 becomes 5 to 6R1.

The radius of curvature of the second directional groove 16b must be greater than the radius of curvature of the first directional groove 16a so that the solid adhesive applied to the male thread 130 of the pinion plug 13 is peeled off when the pinion plug 13 is fastened. This is because the radius of curvature R3 of the second direction groove 16b is 5 to 6 times larger than R1, so that the same round (R) as in the above-described embodiment (see FIG. 8) can be prevented. This is because it is possible to improve the problem of peeling or dropping off of the solid adhesive when the pinion plug 13 is fastened without machining).

Embodiment of the present invention as described above, the caulking groove formed on the inner main surface of the pinion assembly portion is formed in a gentle curve with a relatively large radius of curvature in the direction in which the pinion plug is fastened, on the contrary, The curvature radius is formed into a relatively small curve. Accordingly, the pinion plug can be easily fastened and the resistance to the release direction after the caulking can be increased.

Furthermore, the curvature radius of the pinion plug fastening direction side caulking groove (second direction groove 16b) is formed to have a relatively large gentle curve compared to the other part (first direction groove 16a), thereby Interference with the female thread on the pinion assembly side can be avoided as much as possible, thus making it possible to reliably prevent the solid adhesive from peeling off or falling off when the pinion plug is fastened.

10 is a cross-sectional view of the pinion plug loosening and release preventing device of the steering assembly according to another embodiment of the present invention, and FIG. 11 is an enlarged view illustrating main parts of FIG.

As shown in FIGS. 10 to 11, the female thread 110 of the pinion assembly 11 includes the second female thread 110b having a larger diameter than the first female thread 110a and the first female thread 110a. The first male screw thread 130a and the second female screw thread 110b, which include a two-stage screw thread and include a male screw thread 130 of the pinion plug 13, are also screwable to the first female screw thread 110a. It may be a configuration formed of a two-stage screw thread including a second male thread (130b) that can be screwed on.

Here, the diameter of the second female thread 110b and the second male thread 130b is greater than 0.25 to 0.35 mm in diameter compared to the diameters of the first female thread 110a and the first male thread 130a. desirable.

According to another embodiment of the present invention, the clamping force of the pinion plug to the pinion assembly portion can be further increased, thereby more reliably preventing loosening and detachment of the plug, and the female thread of the pinion plug entry side is relatively larger than the lower portion. By forming the diameter, it is possible to prevent the falling off or peeling of the solid adhesive due to the interference between the threads in the fastening process.

According to the embodiments of the present invention described above, with the application of a solid adhesive on the side surface (threaded surface) of the pinion plug, after screwing together a portion of the pinion plug plastic deformation in the direction of the caulking groove of the pinion assembly to be engaged. The application of the caulking structure can reliably prevent the pinion plug from loosening and disengaging from the rack housing.

Furthermore, according to another embodiment of the present invention of the two-stage screw structure, it is possible to further increase the fastening force of the pinion plug to the pinion assembly portion, thereby more reliably preventing loosening and detachment of the plug, and pinion plug entry side female thread. Since the acid is formed with a relatively large diameter compared to the lower portion, it is possible to improve the falling off or peeling of the solid adhesive due to the interference between the threads during the fastening process

On the other hand, the rack and pinion type steering assembly according to another aspect of the present invention, the pin bar, the rack bar to change the steering wheel by converting the rotational movement of the pinion shaft to linear movement, the rack housing surrounding the rack bar, and the pinion shaft A gearbox made of pinion plugs fixed to the rack housing (see FIG. 1) and the aforementioned pinion plug loosening and disengaging device (see FIGS. 3 to 11).

In the detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

[Description of the code]

11: pinion assembly

13: pinion plug

14: pinion shaft

16: caulking groove

16a: first direction groove

16b: second direction groove

18: caulking border

110: female thread

130: male thread

Claims

A pinion shaft for rotating by the steering shaft, a rack bar for changing the steering wheel by converting the rotation of the pinion shaft into a linear movement, a rack housing surrounding the rack bar, and a pinion plug for fixing the pinion shaft to the rack housing. In the rack and pinion type steering assembly,

A cylindrical pinion assembly provided integrally on one side of the rack housing and having an open upper portion formed with a female thread on an inner main surface thereof;

Caulking groove (Caulking groove) formed in the singular or circumferential direction in the upper portion of the female thread;

A pinion plug having a male screw thread formed on an outer circumferential surface of the pinion assembly unit to correspond to the female screw thread, and having a liquid or solid adhesive applied to the male screw thread at a predetermined or variable thickness; And

Pinion plugs of the steering assembly including; a pinning plug formed at an arbitrary height along the upper outer edge of the pinion plug upper portion of the male thread, and partly plastically deformed toward the caulking groove after screwing to form a stopper for engaging the caulking groove. Release and release prevention device.
The method of claim 1,

The caulking groove,

The radius of curvature of the second direction grooves is composed of a first direction groove on one side and a second direction groove on the other side with respect to the inflection point I farthest from the center C of the pinion assembly part. Pinion plug loosening and release preventing device of the steering assembly, characterized in that larger.
The method of claim 2,

The first direction is a direction in which the pinion plug is screwed into the pinion assembly,

And the second direction is a direction opposite to a direction in which the pinion plug is screwed into the pinion assembly.
The method of claim 3, wherein

The first direction is a clockwise (CW) direction when the pinion assembly is viewed in a plane,

The second direction is the pinion plug loosening and release prevention device of the steering assembly, characterized in that the pinion assembly in a plan view counterclockwise (CCW) direction.
The method of claim 2,

The first direction groove,

A curved groove having an arbitrary point C1 on the center line L1 passing through the inflection point I as a center of curvature and an arc trajectory having a radius of curvature R1 formed in an area overlapping the inner main surface of the pinion assembly. Pinion loosening and release prevention device on steering assembly.
The method of claim 5,

The pinion plug loosening and release prevention device of the steering assembly, characterized in that the C1 is located on the center line (L1) passing through the inflection point (I) between the center (C) and the inner main surface of the pinion assembly.
The method of claim 6,

Wherein C1 is pinion plug loosening and separation prevention device of the steering assembly, characterized in that formed at the intersection of the circle defining the center line (L1) and the effective diameter (D1) of the female thread formed on the inner main surface.
The method of claim 7, wherein

Pinion plug loosening and separation prevention device of the steering assembly, characterized in that the effective diameter (D1) is 38 to 40mm.
The method of claim 5,

The radius of curvature R1 of the first directional groove is 1/7 to 1/6 of the distance D1 / 2 from the center C of the pinion assembly portion to the C1. Device.
The method of claim 2,

The second direction grooves,

A curved groove having an arbitrary point C2 on the center line L1 passing through the inflection point I as the center of curvature and an arc trajectory having a radius of curvature R2 formed in an area overlapping the inner main surface of the pinion assembly. Pinion loosening and release prevention device on steering assembly.
The method of claim 10,

Wherein C2 is pinion plug loosening and separation prevention device of the steering assembly, characterized in that located on the center line (L1) passing through the inflection point (I) between the center (C) of the pinion assembly portion.
The method of claim 11,

C2 is located on the center line (L1) between the center of curvature C1 of the first direction groove on the center line (L1) and the center (C) of the pinion assembly, the pinion plug loosening and release of the steering assembly Prevention device.
The method of claim 12,

The distance (D2 / 2) from the center (C) of the pinion assembly portion C2 is 4/5 ~ 6/7 of the distance (D1 / 2) from the center (C) of the pinion assembly portion Pinion loosening and release prevention device on steering assembly.
The method of claim 10,

Curvature radius R2 of the second directional groove, pinion plug loosening and separation prevention of the steering assembly, characterized in that 1/3 to 2/5 of the distance (D2 / 2) from the center (C) of the pinion assembly portion to the C2. Device.
The method of claim 2,

The second direction grooves,

A curved groove having an arbitrary point C3 on the center line L1 passing through the inflection point I as a center of curvature and an arc trajectory having a radius of curvature R3 formed in an area overlapping the inner main surface of the pinion assembly. Pinion loosening and release prevention device on steering assembly.
The method of claim 15,

The pinion plug loosening and release prevention device of the steering assembly, characterized in that C3 is located on the center line (L1) passing through the inflection point (I) between the center (C) of the pinion assembly portion and the inner main surface.
The method of claim 15,

C3 is located on the center line (L1) between the center of curvature C1 of the first direction groove on the center line (L1) and the center (C) of the pinion assembly, the pinion plug loosening and separation prevention of the steering assembly. Device.
The method of claim 17,

The distance (D4 / 2) from the center (C) of the pinion assembly portion C3 is 1/4 ~ 2/7 of the distance (D1 / 2) from the center (C) of the pinion assembly portion Pinion loosening and release prevention device on steering assembly.
The method of claim 15,

The radius of curvature R3 of the second directional groove is 3 to 3.3 times the distance (D4 / 2) from the center (C) of the pinion assembly portion to the C3 pinion plug loosening and separation prevention device of the steering assembly.
The method of claim 2,

Pinion plug loosening and escape prevention device of the steering assembly, characterized in that the round (Round) is formed at the corner of each of the caulking grooves that the circle that partitions the second direction groove and the groove diameter (D3) of the female thread.
The method of claim 20,

Pinion plug loosening and separation prevention device of the steering assembly, characterized in that the radius of curvature of the round (Round) is 295 to 305mm.
The method of claim 20,

Pinion plug loosening and separation prevention device of the steering assembly, characterized in that the round (Round) formed portion is made of a softer material than the other portion.
The method of claim 1,

The caulking groove is pinion plug loosening and separation prevention device of the steering assembly, characterized in that formed at regular intervals or unequal intervals of 90 ㅀ pitch relative to the center (C) of the pinion assembly.
The method of claim 1,

The female thread of the pinion assembly portion is composed of a two-stage thread including a first female thread and a second female thread having a diameter larger than that of the first female thread.

The male screw thread of the pinion plug further comprises a two-stage screw thread comprising a first male thread screwable to the first female thread and a second male thread screwable to the second female thread. Pinion loosening and breakout prevention device.
The method of claim 24,

Pinion plug loosening and separation prevention device of the steering assembly, characterized in that the diameter of the second female thread and the second male thread is larger than the diameter of each of the first female thread and the first male thread.
A rack and pinion type steering assembly comprising the pinion plug loosening and release prevention device according to any one of claims 1 to 25.