KR20190069703A - Plastic Bush and Bush Manufacturing Apparatus therefor - Google Patents

Abstract

According to the present invention, a plastic bush (1) comprises a middle pipe (20) and an outer pipe (30) forming a body slot in any one placed while surrounding an inner pipe (10) with double concentricity, and is manufactured in a mold (200) having a mold pin (240) inserted into a body slot of the middle pipe (20) or a body slot of the outer pipe (30). Therefore, the plastic bush is manufactured without deformation of the middle pipe (20) from rubber injection pressure (F) of rubber cured with an elastic body (40) filling a double concentricity space.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a plastic bush,

The present invention relates to a bush, and more particularly, to a plastic bush manufacturing apparatus in which deformation of a plastic part is eliminated in manufacturing a bush.

Generally, the suspension bush applied to the suspension arm (or lower arm, upper arm) of a vehicle has a middle pipe / outer pipe integrated with a rubber flow with an inner pipe of a hollow shaft, pipe and steel to improve riding and handling (R & H) and noise, vibration and harshness (NVH) along with the durability of the vehicle.

As a result, steel-applied suspension bushes are required to be plated by requiring plating treatment which requires excessive cost increase in order to solve the field corrosion potential in the future.

The plasticization of the suspension bush, for example, is applied to the outer pipe which is press-fitted into the suspension arm, thereby resolving some of the persistent corrosion phenomena between the suspension arm and the outer pipe.

Korean Patent Laid-Open No. 10-2001-0054640 (Jul. 02, 2001)

Suspension bushes, however, still have potential field corrosion potential in the future due to the plastic parting of plastic outer pipes and steel midpipes.

Usually, the partial plasticization can be solved by using the plastic of the outer pipe and the middle pipe, but the present bush manufacturing method which injects the rubber between the outer pipe and the middle pipe makes it impossible.

This is because the middle pipe forms a rubber injection space with respect to each of the inner pipe and the outer pipe and does not receive any supporting force, thereby causing deformation of the middle pipe due to the injection pressure at the time of rubber injection in the bush rubber running process, It is caused by failure to prevent it in the bush manufacturing mold.

In view of the above, the present invention eliminates the rubber injection pressure applied to the plastic in the bush rubber vulcanizing process, thereby eliminating the corrosion potential without plasticizing the middle / outer pipe, and in particular, And the plastic deformation due to the rubber injection pressure is prevented, whereby the change of the bush components is not required.

In order to accomplish the above object, the plastic bush of the present invention comprises a slot in one of a middle pipe and an outer pipe which are made of plastic and surround the inner pipe in a double concentric manner, and the slot is filled with a double- And a pipe fixing part for preventing deformation of the middle pipe from rubber injection pressure of the rubber vulcanized by the elastic body.

In a preferred embodiment, the slots are formed in the outer pipe, the outer pipe is divided into a slotted outer pipe, and the middle pipe is divided into a hollow pipe-shaped cylindrical middle pipe.

In a preferred embodiment, the slotted outer pipe comprises a hollow pipe body, and the pipe body is formed with a body slot to serve as the slot. The body slot is divided into a plurality of upper body slots formed by an upper portion of the pipe body and a lower body slot formed by a plurality of lower portions.

As a preferred embodiment, the upper body slot is formed in an upper flange of the upper part of the pipe body, the lower body slot is formed in a lower flange of the lower body of the pipe body, Each of the lower edge flanges is formed with hooks of a bent section.

In a preferred embodiment, the slots are formed in the middle pipe, the middle pipe is divided into slotted middle pipes, and the outer pipe is divided into a hollow pipe-shaped tubular outer pipe.

In a preferred embodiment, the slotted middle pipe comprises a hollow pipe body 21, and a body slot is formed in the pipe body to function as the slot. The tubular outer pipe forms an upper edge flange constituting an upper portion of the pipe body and a lower edge flange constituting a lower portion of the pipe body, and each of the upper edge flange and the lower edge flange is formed as a claw .

In order to accomplish the above object, the present invention provides a plastic bush manufacturing apparatus, comprising: a middle pipe surrounding an inner pipe; and an inner space in which a plastic bush made of a rubber vulcanized product is formed in a double concentric space of the outer pipe A mold composed of a top mold, a bottom mold and a middle mold; A plurality of mold pins provided on any one of the upper mold, the lower mold and the middle mold for preventing the deformation of the middle pipe from the rubber injection pressure caused by the rubber vulcanization; Is included.

In a preferred embodiment, the mold pin is provided in the middle mold, and the mold pin is inserted into the outer pipe to prevent deformation of the middle pipe. The middle die is composed of an upper middle and a lower middle which are joined to each other, and the mold fin is provided in the middle of the upper and the middle of the lower.

In a preferred embodiment, the mold pin is provided in the lower mold or the middle mold, and the mold pin is fitted in the middle pipe to prevent deformation of the middle pipe.

In a preferred embodiment, the plastic bush is manufactured by using the outer pipe having the body slot in which the metal mold pin is inserted as a component, or the middle pipe having the body slot in which the metal pin is inserted, as a component .

The plastic bush of the present invention achieves the following actions and effects by making the whole plastic instead of the partial.

As a first weight aspect, it is based on the fact that a low weight plastic applied suspension bush relative to a steel applied suspension bushing is used for both the front A bush, the rear upper arm bush, the lower arm bush, the assist arm bush, the shock absorber bottom bush and the like of the vehicle. Second, as a cost reduction aspect, it is based on the low cost of a plastic-applied suspension bush versus a steel-applied suspension bush and the cost of corrosion-resistant plating is not required. Third, as an aspect of improving corrosion resistance, it is based on the complete plasticization of the suspension bushing to prevent corrosion from corrosion without plating corrosion. Fourth, in terms of customer satisfaction, this is based on the plastic bushing solving the potential for future field erosion problems for suspension arms.

Further, the plastic bush producing apparatus of the present invention realizes the following actions and effects.

First, the mold in which the rubber flow process is performed in the manufacture of the plastic bush can be used as it is. Second, the plastic support structure, which is connected to the middle / outer pipe by the mold pin attached to the mold, receives the rubber injection pressure during the rubber flow process, has a simple structure. Third, by selectively applying mold pins to upper and lower molds, it is possible to diversify the connection structure of mold pins and middle / outer pipes in the production of plastic bushings. Fourth, it is possible to diversify the connection structure between the mold pin and the middle / outer pipe, thereby making it possible to variously change the structure of the middle / outer pipe.

FIG. 1 is a structural view of a plastic bush according to the present invention, FIG. 2 is a modification of a middle pipe of a plastic bush according to the present invention, FIG. 3 is an example in which a plastic bush according to the present invention is applied as a suspension bush, FIG. 5 is a sectional view showing a manufacturing process of the apparatus for manufacturing a middle mold-pin type plastic bush according to the present invention, and FIG. 6 is a cross- 7 is a manufacturing state of the upper and lower mold pin type plastic bush manufacturing apparatus according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

1 and 2, the plastic bush 1 includes an inner pipe 10, a middle pipe 20, an outer pipe 30, and an elastic body 40. Particularly, a slot is formed in the middle pipe 20 or the outer pipe 30, and the slot extends from the rubber injection pressure F of the rubber vulcanized into the elastic body 40 inside the mold 200 to the middle pipe 20 (See Figs. 4-7) so as to prevent deformation of the mold pin 240 (see Fig.

Specifically, the inner pipe 10 acts as a hollow shaft and is fastened to other parts.

Specifically, the middle pipe 20 is made of plastic and is divided into a tubular middle pipe 20A (see FIG. 1) and a slotted middle pipe 20B (see FIG. 2). The outer pipe 30 is made of plastic and is divided into a slotted outer pipe 30A (see FIG. 1) and a cylindrical outer pipe 30B (see FIG. 2). 1, the plastic bush 1 may be composed of a tubular middle pipe 20A and a slotted outer pipe 30A or may be formed of a slotted middle pipe 20B and a tubular outer pipe 30B as shown in Fig. Respectively.

Specifically, the elastic body 40 is made of rubber having elasticity, and rubber injected into the inner and outer sides of the middle pipe 20A is vulcanized to integrate the inner / middle / outer pipes 10, 20, and 30.

Referring to the tubular middle pipe 20A and the slotted outer pipe 30A of FIG. 1, the tubular middle pipe 20A and the slotted outer pipe 30A both have a hollow pipe structure having a circular cross section. In particular, the slotted middle pipe 20B may be provided with a rib for securing rigidity.

The tubular middle pipe 20A is positioned between the inner pipe 10 and the slotted outer pipe 30A to integrate the inner pipe 10 and the slotted outer pipe 30A with the rubber vulcanization of the elastic body 40 give. The slotted outer pipe 30A has upper and lower flanges 33-1 and 33-2 and a body slot 35 formed in the pipe body 31. [

For example, the upper edge flange 33-1 has a shape in which one end portion of the pipe body 31 is curled outwardly, and the lower edge flange 33-2 is formed to surround the other end portion of the pipe body 31 As shown in FIG. Particularly, each of the upper and lower edge flanges 33-1 and 33-2 is formed with an acute angle end claw 33a, and the claw 33a is formed so that the plastic bush 1 is a relative part (for example, (The bush hole 51-1 of the suspension arm 50), thereby preventing a decrease in the bushing pressure input that may be caused by the body slot 35 of the slotted outer pipe 30A.

For example, the body slot 35 includes an upper body slot 35-1a and an upper edge flange 33-2, which extend to the upper edge flange 33-1 while leaving the intermediate portion of the pipe body 31 as a cylindrical section. And a lower body slot 35-2a connected to the lower body slot 35-2a. Particularly, each of the upper and lower body slots 35-1a and 35-2a is composed of six first, second, third, fourth, fifth and sixth body slots 35a, 35b, 35c, 35d, 35e and 35f The first, second, third, fourth, fifth, and sixth body slots 35a, 35b, 35c, 35d, 35e, and 35f are spaced from each other by about 60 degrees. Particularly, the body slot 35 is formed from the rubber injection pressure F of the rubber vulcanized into the elastic body 40 inside the mold 200 to the first, second, third, fourth, fifth and sixth body slots 35a, 35b, 35c, 35d, 35e, and 35f function as a pipe fixing portion for preventing deformation of the cylindrical middle pipe 20A, and the pipe fixing portion is associated with the mold pin 240 of FIG.

Referring to the slotted middle pipe 20B and the tubular outer pipe 30B of FIG. 2, the slotted middle pipe 20B and the tubular outer pipe 30B both have a hollow pipe structure having a circular cross section. In particular, the slotted middle pipe 20B may be provided with a rib for securing rigidity.

Specifically, the slotted middle pipe 20B has a body slot formed by two semispherical pipes formed by hollow pipes having a circular cross section, and a body slot 23-1 and 23-2, (21). The tubular outer pipe 30B forms upper and lower flanges 33-1 and 33-2 and a body slot 35 on the pipe body 31. [

For example, the pipe body 21 has a plurality of surface holes 25 formed in the body surface, and upper and lower edge grooves 26 and 27 are formed in the upper and lower end surfaces of the body, respectively. The left and right slots 23-1 and 23-2, the surface hole 25 and the upper and lower edge grooves 26 and 27 are formed by passing the rubber through the elastic vulcanization of the elastic body 40, Can be minimized. Particularly, the left and right slots 23-1 and 23-2 are formed by a pipe which prevents the deformation of the cylindrical middle pipe 20A from the rubber injection pressure F of the rubber vulcanized into the elastic body 40 in the mold 200. [ And the pipe fixing portion is associated with the mold pin 240 of Fig. In this case, although the left and right slots 23-1 and 23-2 are represented by two, the number of the first, second, third, fourth, fifth, and sixth pins 240a and 240b 240b, 240c, 240d, 240e, and 240f in the manufacture of the plastic bush 1, the first, second, third, fourth, fifth, and sixth pins 240a, Location can be constrained.

For example, the upper edge flange 33-1 has a shape in which one end portion of the pipe body 31 is curled outwardly, and the lower edge flange 33-2 is formed to surround the other end portion of the pipe body 31 As shown in FIG. Particularly, each of the upper and lower edge flanges 33-1 and 33-2 is formed with an acute angle end claw 33a, and the claw 33a is formed in such a manner that the elastic bush 1 is a relative part (for example, (The bush hole 51-1 of the suspension arm 50) so as to prevent the lowering of the bushing pressure input caused by the body slot 35 of the tubular outer pipe 30B.

For example, the body slot 35 includes upper and lower body grooves 35-1b and 35-2b, which are formed so as to extend from the upper and lower frame flanges 33-1 and 33-2 to a portion of the pipe body 31 Respectively. Particularly, each of the upper and lower body grooves 35-1b and 35-2b is formed of two pieces, so that the interval between the upper and lower body grooves 35-1b and 35-2b is 180 degrees, and the cross section thereof is wedge-shaped.

3, a suspension arm 50 to which the plastic bush 1 is applied is exemplified.

Specifically, the plastic bush 1 may be formed by using the inner pipe 10, the middle pipe 20A, the slotted outer pipe 30A and the elastic body 40 described in Figs. 1 and 2 as constituent elements, (10), a slotted middle pipe (20B), a cylindrical outer pipe (30B) and an elastic body (40).

Specifically, the suspension arm 50 forms a female end 51 in which a bush hole 51-1 is formed at both sides thereof.

Therefore, the plastic bush 1 is press-fitted into the bush hole 51-1 and fixed to the arm end 51, thereby being integrated with the suspension arm 50. [ The plastic bush 1 is formed in the upper and lower flanges 33-1 and 33-2 of the slotted outer pipe 30A and the cylindrical outer pipe 30B in the process of being pressed into the bush hole 51-1. The hook 33a is engaged with the arm end 51 around the bush hole 51-1 when the hook 33a is press-fitted into the bush hole 51-1 so as to be engaged and fixed without reducing the bushing pressure input.

4 and Fig. 4 show an example of the plastic bush manufacturing apparatus 100. Fig.

Referring to FIG. 4, the plastic bushing apparatus 100 includes a mold 200, a mold pin 240, a mold controller 300, and a rubber injector 400.

Specifically, the mold 200 is divided into a top mold 210, a bottom mold 220, and a middle mold 230, and the upper mold 210 and the lower mold 220 are positioned on the upper and lower sides, respectively. Particularly, the mold 200 includes the mold pin 240 in the middle 230 so that the apparatus 100 for manufacturing a plastic bush is formed into the apparatus 1 for manufacturing a medium-sized mold pin type plastic bush.

For example, the upper die 210 is an integral block having a bush hole 211 and a bush boss 212 formed therein. The lower mold 220 is a one-piece block in which a bush hole 221 and a bush boss 222 are formed. In particular, the bush locating holes 211 and 221 of the upper and lower molds 210 and 220 are aligned with the length of the inner pipe 10 of the plastic bush 1 in the mold assembly state. The middle type 230 is divided into an upper middle type 230-1 and a lower middle type 230-2. The upper middle type 230-1 is coupled with the upper mold 210, Is coupled with the lower mold 210. A bush hole 231 is formed in each of the upper middle portion 230-1 and the lower middle portion 230-2 and a mold pin 240 is provided in the bush hole 231. [ Particularly, the bush hole 231 of the middle die 230 is inserted into the cylindrical middle pipe 20A or the slotted middle pipe 20B of the plastic bush 1 in the assembled state of the upper / lower middle pieces 230-1, It is set to length.

Specifically, the mold pins 240 have six first, second, third, fourth, fifth, and sixth pins (not shown) provided with spaced distances K to each other in the hole diameter D of the bush hole 231 240a, 240b, 240c, 240d, 240e, and 240f. Particularly, the first, second, third, fourth, fifth, and sixth pins 240a, 240b, 240c, 240d, 240e, 240f are connected to the bush hole 231 of the upper middle portion 230-1, Respectively, and the same mold pin layout is formed.

For example, the spacing K between the first, second, third, fourth, fifth, and sixth pins 240a, 240b, 240c, 240d, 240e, 240f for the mold pin layout is about 60 degrees . This is because the slotted outer pipe 30A of the manufactured plastic bush 1 is fitted to the first, second, third, fourth, fifth and sixth body slots 35a, 35b, 35c, 35d, 35e and 35f . Therefore, the mold pin layout can be modified to match the structure of the plastic bush 1.

Specifically, the mold controller 300 controls the rubber injection amount of the rubber injector 400 when manufacturing the plastic bushing, and controls the joining / separation of the mold 200 and the temperature / time of the rubber vulcanization. The rubber injector 400 injects rubber into the mold 200. Therefore, the mold controller 300 and the rubber injector 400 are typical equipment for manufacturing plastic bushings.

5, the manufacturing conditions of the plastic bush 1 according to the control of the rubber injector 400 and the mold 200 of the mold controller 300 are illustrated. In this case, the plastic bush 1 is illustrated as a tubular middle pipe 20A and a slotted outer pipe 30A.

As shown in the figure, a middle part 230 assembled with upper / lower middle parts 230-1 and 230-2 is positioned between the upper part 210 and the lower part 220 and the plastic bush 1 is divided into upper, The inner pipe 10 is fixed to the bush bosses 212 and 222 while the inner pipe 10 and the outer pipe 30A are positioned at the bushing holes 211, .

More specifically, the mold pin 240 is inserted into the slot-like outer pipe 30A such that the first, second, third, fourth, fifth, and sixth pins 240a, 240b, 240c, 240d, 240e, 4, 5, and 6 pins 240a (35a, 35b, 35c, 35d, 35e, and 35f) are fitted to the outer side of the cylindrical middle pipe 20A, , 240b, 240c, 240d, 240e, 240f.

In this state, the rubber injection pressure F is applied to the inside and outside of the cylindrical middle pipe 20A in the inner space of the upper / lower middle parts 230-1 and 230-2 of the middle part 230 when the rubber injector 400 is injected with rubber .

However, the tubular middle pipe 20A is provided with the first, second, third, fourth, fifth, sixth, 6 dots 240a, 240b, 240c, 240d, 240e, and 240f to maintain the durability against the rubber injection pressure F. [

As a result, the cylindrical middle pipe 20A can withstand the rubber injection pressure F by the first, second, third, fourth, fifth and sixth pins 240a, 240b, 240c, 240d, 240e and 240f, It is made of plastic bush without any deformation.

From which a plastic bush 1 with a middle pipe 20A and a slotted outer pipe 30A is produced.

6 and 7 show a modified example of the mold 200. [0054]

6, the mold 200 is divided into a top mold 210, a bottom mold 220 and a middle mold 230, and the mold pin 240 is divided into either the top mold 210 or the bottom mold 220, And the middle mold 230 comprises an integral block. The mold pins 240 have a spacing distance K of about 60 degrees with respect to each other at a hole diameter d of the bush hole 221 of the upper mold 210 and the bush hole 211 of the lower mold 220 The first, second, third, fourth, fifth, and sixth pins 240a, 240b, 240c, 240d, 240e, and 240f.

Therefore, the mold 200 is formed by the upper and lower mold pin type plastic bush manufacturing apparatuses 1 of the plastic bush producing apparatus 100.

However, the hole diameter d is adjusted to the diameter of the slotted middle pipe 20B. This is because the first, second, third, fourth, fifth and sixth pins 240a, 240b, 240c, 240d, 240e and 240f are inserted into the left and right slots 23-1 and 23-2 of the slotted middle pipe 20B, So as to restrain the slotted middle pipe 20B. In this case, the left and right slots 23-1 and 23-2 are formed in six slots corresponding to the first, second, third, fourth, fifth, and sixth pins 240a, 240b, 240c, 240d, 240e, and 240f. The first, second, third, fourth, fifth, and sixth pins 240a, 240b, 240c, 240d, 240e, and 240f are aligned with two left and right slots 23-1, Pins 240a and 240b.

7, the inner pipe 10 is fixed to the bush bosses 212 and 222 while the plastic bush 1 is positioned inside the assembled upper / middle / lower molds 210, 230 and 220, and the slotted middle pipe 20B Second, third, fourth, fifth, and sixth pins 240a, 240b, 240c, 240d, 240e, and 240f provided on one of the upper and lower molds 210 and 220, .

Therefore, in manufacturing the plastic bushing, the slotted middle pipe 20B can withstand the rubber injection pressure F by the first, second, third, fourth, fifth, and sixth pins 240a, 240b, 240c, 240d, 240e, 240f It is made of plastic bushes without any deformation during the manufacturing process.

 From which a plastic bush 1 with a slotted middle pipe 20B and a cylindrical outer pipe 30B is produced.

As described above, the plastic bush 1 according to the present embodiment includes a middle pipe 20 and an outer pipe 30, each having a body slot formed in one of the inner pipe 10 and the inner pipe 10, The rubber is vulcanized by the elastic body 40 filling the double concentric space by being manufactured in the mold 200 having the body slot of the middle pipe 20 or the metal pin 240 inserted in the body slot of the outer pipe 30. [ Without deforming the middle pipe 20 from the rubber injection pressure F of the inner pipe 20.

1: plastic bush 10: inner pipe
20: Middle pipe 20A: Tubular middle pipe
20B: slotted middle pipe 21, 31: pipe body
23-1, 23-2: left and right slots 25: surface holes
26, 27: upper and lower frame grooves
30: Outer pipe 30A: Slotted outer pipe
30B: Tubular outer pipe 33-1, 33-2: Upper and lower flange flanges
33a: hook 35: body slot
35-1a, 35-2a: upper and lower body slots
35-1b, 35-2b: upper and lower body grooves
35a, 35b, 35c, 35d, 35e, 35f: first, second, third,
40: elastomer
50: suspension arm 51: arm end
51-1: Bush Hall
100: Plastic bushing device
200: mold 210: upper mold
211, 221, 231: bush locating holes 212, 222:
220: Lower mold 230: Medium
230-1: Upper Medium 230-2: Lower Medium
240: mold pin
240a, 240b, 240c, 240d, 240e, 240f: first, second, third,
300: mold controller 400: rubber injector

Claims (8)

And an outer pipe which surrounds the inner pipe and the middle pipe and has a body slot,
The body slots are symmetrical with respect to the bush center
Lt; / RTI >
The plastic bush according to claim 1, wherein the body slots are formed on upper and lower portions of the outer pipe, respectively.
The plastic bush according to claim 1, wherein the body slots are formed in a plurality of spaces at equal intervals.
The plastic bush of claim 1, wherein the middle pipe comprises a slot or surface hole.

Molds injected with rubber vulcanized bushes on inner pipe, plastic middle pipe and outer pipe;
A mold pin symmetric with respect to a center of the bushing to support the outer side of the middle pipe;
Wherein the plastic bushing is formed of a plastic material.
The plastic bush manufacturing apparatus according to claim 5, wherein the plurality of mold pins are formed at equal intervals.
[6] The method of claim 5, wherein the mold is of a top, bottom,
Wherein the mold pin is protruded from the upper mold or the lower mold and inserted between the middle pipe and the outer pipe.
[6] The method of claim 5, wherein the mold is of a top, bottom,
The middle type is composed of an upper middle type and a lower middle type,
Wherein the mold pin is inserted into the body slot of the outer pipe and protrudes toward the center of the bush from an inner upper portion of the upper middle portion and an inner lower portion of the middle portion of the lower middle portion.

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