KR100826515B1 - Rack forming apparatus of rack bar - Google Patents

Abstract

A rack forming apparatus of a rack bar is provided to simplify structure of the apparatus, accurately form the rack on the hollow bar by preventing the rotation of the hollow bar when forming a rack on a hollow bar, and prevent deformation of the hollow bar when forming the rack on the hollow bar. A rack forming apparatus of a rack bar comprises: a base(100); a pair of sidewalls which are installed at both sides of the base oppositely to each other, and which have a slot formed in at least one thereof such that a hollow bar(11) enters and leaves the sidewalls through the slot; a rotary block(300) of which one end is rotatably formed between the sidewalls, which has a forming roller(500) rotatably formed on a bottom face thereof, and of which the other end is supported by an elastic supporting unit; a rotary bar(600) which is rotatably supported to the sidewalls at an upper position of the rotary block, and which has a long plane(602) formed thereon in its axial direction; a slider(400) which is slidingly placed on a top face of the rotary block by a first moving unit, and which has an inclined surface(401) formed on a top face thereof in a way that the inclined surface is surface contacted with the plane; a moving block(200) placed on the base such that the moving block is slidingly reciprocated by a second moving unit; a pair of clamps(221,222) mounted on the moving block to clamp the hollow bar; and a core bar removably inserted into the hollow bar.

Description

Rack forming apparatus of rack bar

1 is a perspective view illustrating a rack bar in which a rack is formed on a hollow bar;

2 and 3 is a schematic view showing a conventional molding apparatus,

4 is a schematic view showing a state of the bending bar bar deformed,

5 is a schematic perspective view showing a molding apparatus of the present invention;

6 and 7 is a schematic view of the operating state of the apparatus of the present invention,

8 is a perspective view of main parts of the clamp;

9 is a cross-sectional view of the clamped hollow bar,

10 is a cross-sectional view of the hollow bar inserted into the bar;

It is sectional drawing explaining the extraction state of a coabar.

* Explanation of symbols for main parts of the drawings

10 ... rack bar 11 ... hollow bar

100 ... Base 200 ... Movement Block

300 ... rotating block 400 ... slider

500 ... Molding Roller 600 ... Rotating Bar

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rack forming apparatus for a rack bar, and more particularly, to a rack forming apparatus for a rack bar that has improved the tooth precision of a rack to be formed, minimizes deformation of the rack bar during rack forming, and has a simple structure. .

In general, the rack bar (10) used as a steering mechanism of the vehicle (rack) is formed as a rack (12; rack) on the main surface of the hollow bar 11, as shown in Figure 1, to reduce the hollow I'm using a pipe.

An example of an apparatus for forming such a hollow rack bar is disclosed in US Patent No. 5,628,222, a representative of which is shown in FIGS. 2 and 3.

The apparatus 20 includes a bed 21, a clamp 22 for fixing the hollow bar 11, a setter 23 for inserting and detaching the core bar 26 into the hollow bar 11, a forming roll ( A drive 24 for reciprocating 24 and a depth adjuster 25 for adjusting the tooth depth of the rack.

Such a device clamps the hollow bar 11 by bringing the left and right clamp members 44 and 45 close to each other as the clamp cam 47 is raised by the operation of the clamp cylinder 46, and the coa setter 23 By the operation of the core bar 26 is inserted into the hollow bar (11).

In addition, the slide bracket 74 supporting the forming roll 27 is reciprocated left and right by the left / right reciprocating cylinder 72, and the depth control cam 82 is moved forward by the driving of the motor 84. As a result, the lifting block 83 and the clamp holder 42 are raised.

As such, the rack is molded on the main surface of the hollow bar 11 while being pressurized by the rising of the hollow bar 11 and the reciprocating movement of the forming roll 27.

However, such a device has the following problems.

First, the structure is complicated by having a structure in which the forming roll 27 is reciprocated by the left / right reciprocating cylinder 72 and the bracket 74 is moved along the guide 73.

Second, the hollow bar 11 is in close contact with the forming roll 27 at a strong pressure to form a rack, in which case the hollow bar 11 is clamped by the clamp members 44 and 45, although the forming roll ( The hollow bar 11 can be slidably rotated by the frictional force with 27), and thus the precision molding of the rack is limited.

Third, in spite of forming the rack by inserting the coabar 26 into the hollow bar 11, both side surface portions of the rack 12 to be formed are held in close contact with the coabar 26 to act as a reaction force to the hollow bar 11. A problem arises that the side part side of the side is deformed outward.

Fourth, when the molding pressure is applied by the forming roller as shown in Figure 4, there is a problem that the hollow bar 11 is deformed concave upward in response to the clamp member.

The present invention has been made to solve the above problems, and an object thereof is to provide a rack forming apparatus of a rack bar having a simple structure.

Another object of the present invention to provide a rack forming apparatus of a rack bar to prevent the rotation of the hollow bar when forming the rack to enable precision molding of the rack.

Still another object of the present invention is to provide a rack forming apparatus for a rack bar, which can prevent deformation of a hollow bar when forming a rack.

In the present invention to achieve the above object in the rack forming apparatus of the rack bar is formed on the outer peripheral surface of the hollow bar (bar),

A base;

A pair of sidewalls provided on both sides of the base to face each other and having a long hole for entering and exiting the hollow bar;

A rotation block having one end rotatably provided between the side walls, a forming roller rotatably provided at a bottom thereof, and the other end supported by an elastic support means;

A rotation bar rotatably supported on the side wall at an upper position of the rotation block and having a plane long in the axial direction;

A slider seated on an upper surface of the pivot block so as to be slidably movable by a first moving means and having an inclined surface in surface contact with the plane on an upper surface thereof;

A moving block seated on the base so as to reciprocally slide by a second moving means;

A pair of clamps mounted on the moving block to clamp the hollow bar;

With a co-bar removably inserted into the hollow bar;

It is characterized in that the rack is molded by reciprocating movement of the hollow bar while pressing the hollow bar by the downward rotation of the rotation block.

In addition, the elastic support means is a support plate is formed between the side wall, a hanger through which the lower end is coupled to the other end of the rotation block, and is supported on the upper surface of the support plate and supported on the upper end of the hanger Characterized in that the spring is provided.

In addition, the first moving means is characterized in that the screw or cylinder rotated by the drive motor.

In addition, the second moving means is characterized in that the screw or cylinder rotated by the reciprocating motor.

In addition, the clamp for clamping the hollow bar is characterized in that the non-slip block is further provided to prevent the rotation of the hollow bar.

In addition, between at least the horizontal center axis of the coa bar and the horizontal center axis of the hollow bar is characterized in that the space between the inner peripheral surface of the hollow bar and the outer peripheral surface of the coa bar.

In addition, the hollow bar is further provided with a moving means for entering or taking out the coa bar,

The moving means has a support having one end supported by the hollow bar, and a cylinder supported at the other end side of the support, the rod being detachably coupled to an end of the hollow bar, according to the operation of the cylinder. Coaba is characterized in that it is coupled to or separated from the hollow bar.

In addition, the clamp is characterized in that the recess is formed so as to be spaced apart from the lower surface of the hollow bar.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Rack bar (10; rack bar) applied to the molding apparatus of the embodiment of the present invention has a structure in which the rack gear 12 is formed on the upper surface of the outer peripheral surface of the hollow bar 11, as shown in FIG. As used in the steering mechanism of the vehicle (steering) and the like.

5 to 7 showing the molding apparatus of the embodiment of the present invention for forming the rack 12 on the outer circumferential surface of the hollow bar 11, the molding apparatus is formed on both sides of the base 100 and the base 100; It is provided to face each other and has a pair of side walls (110, 120) formed with a long hole (111) for entering and exiting the hollow bar (11).

The side walls 110 and 120 are not limited in shape as long as they can support the rotation block 300 and the rotation bar 600 which will be described below.

A rotating block 300 is rotatably supported between the sidewalls 110 and 120 so that a forming roller 500 is rotatably provided at a bottom thereof and the free end thereof is supported by an elastic support means.

A rotation bar 600 is rotatably supported on the side walls 110 and 120 at an upper position of the rotation block 300 and has a plane 602 that is long in the axial direction, and the rotation block 300 is provided. The slider 400 is provided on the upper surface of the inclined surface 401 is slidably seated by the first moving means and the surface 602 is in contact with the plane 602 on the upper surface.

In addition, the molding apparatus of the present invention is mounted on the movable block 200 and the movable block 200 which is seated on the base 100 so as to be reciprocally slidably moved by the second movable means, and clamps the hollow bar 11. A pair of clamps 221 and 222 and a coabar 800 are inserted into the hollow bar 11 to be taken out.

Such a molding apparatus presses the hollow bar 11 by the downward rotation of the rotation block 300 and allows the rack to be molded by the reciprocating movement of the hollow bar 11.

The elastic support means is a support plate 130 is formed between the side walls (110, 120),

A hanger 700 which penetrates through the support plate 130 and has a lower end coupled to the other end of the pivot block 300, and is supported by an upper surface of the support plate 130 and supported by an upper end of the hanger 700. It has a spring 710.

Such elastic support means is supported by the spring 710 is rotatably rotated when the rotation block 300 is lowered, and can be rotated upward by the restoring force of the spring 710.

The first moving means is composed of a screw rotated by the drive motor 410, it is also possible to move the slider 400 by the operation of the cylinder.

The second moving means is composed of a screw rotated by the reciprocating motor 210, it may be configured to move the moving block 200 by the operation of the cylinder.

8 and 9, the clamps 221 and 222 clamping the hollow bar 11 include non-slip blocks 231 and 232 that prevent the hollow bar 11 from rotating. It is prepared. The anti-slip blocks 231 and 232 prevent the idle bar when the hollow bar 11 is moved while being pressed by a strong pressure to the forming roller 500, thereby preventing the poor molding of the rack.

As illustrated in FIG. 8, recesses 222a are formed in the clamps 221 and 222 so as to be spaced apart from the bottom surface of the hollow bar 11. In this case, it is possible to prevent the bending of the hollow bar 11 during rack forming.

Meanwhile, referring to FIG. 10, an inner circumferential surface of the hollow bar 11 and a coabar 800 are disposed between the horizontal center axis B of the cobar 800 and the horizontal center axis A of the hollow bar 11. It is configured to be spaced apart from the outer peripheral surface of the). In this case, when the hollow bar 11 is pressurized with a strong pressure on the forming roller 500 and the rack 12 is molded, the reaction force of the coabar 800 is generated near the horizontal center axis A of the hollow bar 11. Prevent deformation.

On the other hand, referring to Figure 11, the hollow bar 11 is further provided with a moving means for entering or taking out the co-bar 800, the moving means is one end of the support is supported by the hollow bar (11) 910 and a cylinder 900 which is supported on the other end side of the support 910 and whose rod is detachably coupled to the end of the hollow bar 11, according to the operation of the cylinder 900. The coaoba 800 was coupled to or separated from the hollow bar 11.

The molding apparatus having the above configuration is operated as follows.

First, the hollow bar 11 enters through the long hole 111 of the side wall 110 to be seated in the clamps 221 and 222, and clamped by tightening the tightening holes 240 to the tightening holes 221a. It is also possible to clamp using a hydraulic cylinder without using the bolt 240. At this time, the clamping force is increased not only by the anti-skid blocks 231 and 232 but also the hollow bar despite the strong friction with the forming roller 500. It is possible to prevent the rotation of (11).

Subsequently, the driving motor 410 is operated to slowly move the slider 400. In this case, as shown in FIGS. 6 and 7, the inclined surface 401 and the plane 602 are in surface contact with each other, and thus the rotation bar 600 is rotated as the slider 400 is moved, and the rotation block 300 is gradually lowered and rotated. Will be.

At this time, the rotation block 300 is supported by the hanger 700, the forming roller 500 is in contact with the upper surface of the hollow bar (11).

Subsequently, the reciprocating motor 210 is operated to move the reciprocating block 200 reciprocally, and in a continuous downward rotation of the rotation block 300, the forming roller 500 presses the hollow bar 11 while the rack 12 is pressed. Will be molded.

At this time, since the recesses 222a are formed in the clamps 221 and 222, the forming roller 500 prevents the reaction force when forming the rack 12 while pressing the hollow bar 11 to prevent the reaction of the hollow bar ( It is possible to prevent the bending of 11).

In addition, the space between the inner circumferential surface of the hollow bar 11 and the outer circumferential surface of the cobar 800 is spaced between the horizontal center axis B of the cobar 800 and the horizontal center axis A of the hollow bar 11. Since the hollow bar 11 is pressurized with a strong pressure on the forming roller 500 and the rack 12 is molded, the hollow bar 11 is formed by the reaction force of the coabar 800 near the horizontal center axis A of the hollow bar 11. Prevent deformation.

As described above, after the molding of the rack 12 is completed by the gradual lowering of the forming roller 500 and the reciprocating movement of the hollow bar 11, the cylinder 900 is operated as shown in FIG. Is taken out from the hollow bar (11).

The molding apparatus of the present invention as described above has the following advantages.

First, since forming the rack while gradually pressing the forming roller and the bar can extend the life of the forming roller.

Second, the rotation block 300 is lowered by the horizontal movement of the slider 400 to have a structure to lower the forming roller 500, thereby simplifying the structure than the conventional.

Third, by forming a recess in the clamp to prevent the bending of the hollow bar during the molding of the rack by the forming roller.

Fourth, by adopting a non-slip block in the clamp to prevent the idle bar of the hollow bar during molding the molding to enable precision molding.

Fifth, the adoption of the cylinder 900 and the support 910 enables the take-out of the coava 800 in a simple structure.

Sixth, between the inner circumferential surface of the hollow bar 11 and the outer circumferential surface of the coabar 800 is spaced between the horizontal center axis B of the coarse 800 and the horizontal center axis A of the hollow bar 11. Therefore, when the hollow bar 11 is pressurized with a strong pressure on the forming roller 500 and the rack 12 is molded, deformation by the reaction force of the coabar 800 near the horizontal center axis A of the hollow bar 11 is achieved. To prevent.

Claims (8)

In the rack forming apparatus of the rack bar is formed on the outer peripheral surface of the hollow bar (bar), The base 100; A pair of sidewalls 110 and 120 provided opposite to each other on both sides of the base 100 and having a long hole 111 formed therein to allow the hollow bar 11 to enter and exit; A rotation block (300) having one end rotatably provided between the side walls (110) (120), a forming roller (500) rotatably provided at the bottom thereof, and the other end supported by an elastic support means; A rotation bar (600) rotatably supported on the side walls (110) (120) at an upper position of the rotation block (300) and having a plane (602) elongated in an axial direction thereof; A slider 400 seated on an upper surface of the pivot block 300 by a first moving means and having an inclined surface 401 on the upper surface thereof in contact with the plane 602; A moving block (200) seated on the base (100) to be reciprocally slidable by a second moving means; A pair of clamps 221 and 222 mounted on the movable block 200 and clamping the hollow bar 11; Coava 800 is inserted into the hollow bar 11 to be taken out; With The rack forming apparatus of the rack bar, characterized in that the rack is molded by the reciprocating movement of the hollow bar (11) while pressing the hollow bar (11) by the lower rotation of the rotation block (300). According to claim 1, The elastic support means is the support plate 130 is formed between the side walls (110, 120), A hanger 700 penetrating through the support plate 130 and having a lower end coupled to the other end of the pivot block 300; Rack forming apparatus of the rack bar, characterized in that it is provided with a spring (710) supported on the upper surface portion of the support plate 130 and the upper end of the hanger (700). The rack forming apparatus of claim 1, wherein the first moving unit is a screw or a cylinder rotated by a drive motor (410). The rack forming apparatus of claim 1, wherein the second moving means is a screw or a cylinder rotated by the reciprocating motor (210). The non-slip block (231) (232) according to any one of claims 1 to 4, wherein the clamp (221) (222) for clamping the hollow bar (11) prevents the rotation of the hollow bar (11). Rack forming apparatus of the rack bar, characterized in that it is further provided. The hollow bar 11 according to any one of claims 1 to 4, wherein the hollow bar 11 is disposed between at least the horizontal center axis B of the coarse 800 and the horizontal center axis A of the hollow bar 11. Rack forming apparatus of the rack bar, characterized in that spaced apart between the inner circumferential surface and the outer circumferential surface of the core bar (800). According to any one of claims 1 to 4, The hollow bar 11 is further provided with a moving means for entering or taking out the core bar 800, The moving means has a support 910, one end of which is supported by the hollow bar 11, A cylinder 900 is supported on the other end side of the support 910 and the rod is detachably coupled to the end of the hollow bar 11. According to the operation of the cylinder 900, the bar bar rack forming apparatus of the rack bar, characterized in that coupled to or separated from the hollow bar (11). The rack bar rack according to any one of claims 1 to 4, wherein recesses (222a) are formed in the clamps (221, 222) so as to be spaced apart from the lower surface of the hollow bar (11). Molding apparatus.

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