KR20180048046A - Inside Fixing type Mounting Bush Unit and Sub Frame thereby - Google Patents

Abstract

The present invention relates to a mounting bush unit of an internal fixing type that can compensate an assembly tolerance by an internal fixing force, and a subframe. The mounting bush unit includes a mounting bush (10) having a through-hole; a mounting stud (30) which comes in contact with the inner peripheral surface of the through-hole to form an upwardly internal fixing force, and is pressed by the mounting bush to form an upwardly external fixing force; and a mounting nut (40) threaded with the mounting stud, the mounting nut coming in contact with the inner peripheral surface of the through-hole to form a downwardly internal fixing force, and being pressed by the mounting bush to form a downwardly external fixing force. A strong fastening force is generated by a double fixing force of the mounting bush, the mounting stud and the mounting nut. Since the mounting bush unit is formed in a conical shape, it is possible to compensate for a position clearance, as well as an assembly clearance.

Description

Inside Fixing Type Mounting Bush Unit and Sub-frame Thus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting bush, and particularly to a subframe to which a mounting bush unit capable of absorbing an assembly tolerance with an inner fixing force is applied.

In general, the subframe for a vehicle determines the performance of securing the left and right geometry of the suspension device to determine the vehicle motion performance in the state where the subframe is engaged with the vehicle body.

For this, the subframe is assembled together with the mounting bushing, and is fastened to the vehicle body by the mounting member, thereby satisfying the regulation of the tolerance of the subframe by the mounting bushing and securing the left and right geometry.

For example, four first, second, third, and fourth mounting bushings coupled to each of four vehicle body fastening points are coupled to a "#" type rear wheel subframe, and a positive hole formed in the first mounting bush is connected to a reference And the second mounting bushes are formed with slot holes having the same diameter and the same diameter as the regular holes and each of the third and fourth mounting bushes has a hole having a diameter larger than the regular hole. In this case, the first and second mounting bushes are positioned toward the rear of the vehicle, and the third and fourth mounting bushes are coupled to the vehicle body so as to be positioned toward the front of the vehicle.

Therefore, the "# " type rear wheel subframe is fastened to the vehicle body through the mounting member by aligning the slot holes of the second mounting bush with the holes of the first mounting bushes, So that the tolerance regulation is satisfied.

As a result, the NVH (Noise, Vibration, Harshness) of the "#" type rear wheel subframe can maintain the improved NVH performance by buffering the first, second, third, and fourth mounting bushings even when the vehicle is running on rough roads.

Korean Patent Publication No. 10-2004-0042595 (May 20, 2004)

However, there is a structural weakness that the mounting bushes are only sensitive to the slot hole position tolerance by providing a path through which the mounting member that forms the fixing force with the vehicle body passes through the outside of the bush.

For example, if the slot hole position tolerance is given as + 2T (T: vehicle longitudinal direction), the slot hole of the second mounting bushing has a position error of + 1T with respect to the positive hole of the first mounting bushing, And the unexpected sub-frame rotation causes one side of the mounting member to be biased with respect to the bore hole of the third and fourth mounting bushes.

As a result, the subframe rotation causes a difference in the vehicle's motion by generating a difference in the geometry between the left and right sides of the vehicle, and one of the mounting members generates noise during harsh driving, resulting in degradation of the vehicle with NVH degradation.

According to the present invention, the mounting member for forming the vehicle body and the outer fixing structure from the outside of the mounting bush further includes an inner fixing structure in the inner diameter of the mounting bush, so that the mounting tolerance by the inner fixing structure, And it is an object of the present invention to provide an inner fixed type mounting bush unit and subframe capable of improving vehicle motion performance and NVH by preventing the subframe rotation and the inclination of one side of the mounting member due to the synergistic action of the inner /

According to an aspect of the present invention, there is provided an inner fixing type mounting bush unit comprising: a mounting bush having a hollow hole formed therein and divided into an upper side and a lower side; A mounting stud inserted into the hollow hole at the upper side to form an upper inside fixing force and hooked to the upper side; A mounting nut which is inserted into the hollow hole at the lower side to form a lower end side fixing force and is screwed to the mounting stud in a state of being engaged with the lower side; And the like.

In a preferred embodiment, the mounting bush includes an inner pipe divided into the upper part and the lower part together with the hollow hole, and the upper inner fixing force is applied to the upper surface of the conical upper part of the inner pipe and the conical bolt seat surface body of the mounting stud. And the bottom inner fixing force is formed by closely contacting the conical lower seat seating surface of the inner pipe and the conical nut seat seating body of the mounting nut.

As a preferred embodiment, the mounting bush has an outer pipe enclosed by the inner pipe, and a vulcanized molded body is filled between the outer pipe and the inner pipe.

In a preferred embodiment, the mounting stud has a head formed with a tool insertion groove on one side of the bolt seat body, and a bolt shaft for screwing the mounting nut to the other side. A bolt outer pressurizing flange concentric with the head is formed between the head and the bolt seat surface body with a diameter larger than that of the head and the bolt outer pressurizing flange is hooked on the upper portion of the inner pipe, Thereby forming an external fixation force.

In a preferred embodiment, the mounting nut is formed with a head formed on one side of the nut seat surface body, and the screw seat hole formed with a screw into the nut seat seat body and the head is passed through the inner circumferential surface. Wherein a nut outer pressurizing flange having a larger diameter than the head and concentric with the head is formed between the head and the nut seat surface body and the nut outer pressurizing flange is engaged with the lower portion of the inner pipe, Thereby forming an external fixation force.

In order to achieve the above-mentioned object, the subframe of the present invention includes a mounting bush having a hollow hole, an upper inner fixing force which is in contact with the inner diameter of the hollow hole, a mounting stud which forms an upper outer fixing force, And a mounting nut that is screwed to the mounting stud so as to form a lower inner fixing force in close contact with the inner diameter of the hollow hole and a lower outer fixing force in which the mounting bush is pressed.

In a preferred embodiment, the mounting bushing includes a first mounting bushing coupled to the rear reference mounting closure point of the subframe, a second mounting bushing coupled to the rear mounting closure point, a third mounting bushing coupled to the front left mounting closure point, And a fourth mounting bush portion coupled to the front right mounting fastening point, wherein the hollow holes through which the mounting studs are coupled to the first, second, third, and fourth mounting bushes are formed in the same size and shape.

The subframe to which the inner fixing type mounting bushing of the present invention is applied realizes the following actions and effects.

First, the influence of the tolerance of each part can be minimized when mounting the existing body / subframe. Second, by absorbing the component tolerance by the inner fixing structure given to the mounting bush, the subframe is placed at the equilibrium position by the bushing reaction force, thereby improving the handling and riding comfort (R & H) . Third, since the position of the mounting member is always positioned at the center of the inner pipe of the mounting bush with the inner fixing structure, the NVH is improved while preventing the noise due to the slanting of the mounting member even during the harsh driving. Fourth, since the inner fixing structure is formed by a combination of conical shapes having a gradient of a mounting bush, a mounting stud, and a mounting nut, an increase in jointing area and an increase in tightening robustness by axial force dispersion are achieved.

2 is a perspective view of a mounting bush and a mounting member according to an embodiment of the present invention. FIG. 3 is a side view of the inner fixing type mounting bush unit according to the present invention. FIG. 4 is a view illustrating the assembly of a subframe using a mounting bush and a mounting member according to the present invention. FIG. 5 is a view showing a state where a subframe according to the present invention forms a suspension geometry .

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 show the structure of an inner fixed type mounting bush unit.

Referring to FIG. 1, the mounting bush unit 1 includes a mounting bush 10, a mounting stud 30, and a fastening member 20 paired with a mounting nut 40.

Particularly, when the mounting bush unit 1 is assembled, the mounting stud 30 forms an upper double pressing force from the upper portion of the mounting bush 10 (for example, one side in the longitudinal direction of the mounting bush 10) And the mounting nut 40 forms a lower double pressing force at a lower portion of the mounting bush 10 (e.g., the other side in the longitudinal direction of the mounting bush 10).

For example, the upper double biasing force may be determined by an upper inside clamping force A _upper , in which the mounting stud 30 inserted into the inside diameter of the mounting bushing 10 is in close contact with the inside of the mounting bushing 10 from the upper end of the mounting bushing 10, And an upper outer fixing force B _upper which presses an upper end portion of the mounting bush 10 by screwing the mounting stud 30 together with the mounting nut 40 together. The lower double pressing force is generated by the mounting nut 40 and the mounting stud 30 together with the _lower inner fixing force A _{lower that the} mounting nut 40 is in contact with the inside of the mounting bush 10 from the lower end of the mounting bush 10 And a lower end fixing force (B _lower ) for pressing the lower end of the mounting bush 10 by screwing.

Therefore, the mounting bush 10 is implemented as an inner fixing type mounting bushing by the _upper and lower inner fixing forces A _upper and A _lower of the mounting stud 30 and the mounting nut 40, and is distinguished from the conventional mounting bush.

2 (a), the mounting bush 10 is composed of an outer pipe 11, an elastic body 13, and an inner pipe 15 integrated with each other.

Specifically, the outer pipe 11 is made of a hollow pipe type steel material and forms an upper portion with an annular upper end bent inwardly and an upper portion with an annular lower end bent outwardly. The elastic body 13 is made of a rubber material and is vulcanized by the inner diameter of the outer pipe 11 to integrate the inner pipe 15 with the outer pipe 11. [ The inner pipe (15) is made of a hollow pipe type steel material and has an annular upper / lower end bent outwardly to form an upper / lower part.

Particularly, the upper seating surface portion 15-1 is formed by using the inner diameter of the inner pipe 15 at the upper portion of the inner pipe 15 (for example, one side in the longitudinal direction of the inner pipe 15) (For example, the other side surface in the longitudinal direction of the inner pipe 15) is formed by using the inner diameter of the inner pipe 15 as a bottom surface portion 15-2. The upper seating surface 15-1 together with the mounting stud 30 forms an _upper inner fixing force A _upper and the lower seating surface 15-2 is formed with the mounting nut 40 together with the lower inner fixing force A _lower . Each of the upper and lower seating portions 15-1 and 15-2 is conical so as to form stronger upper and lower inner fixing forces A _upper and A _lower , Has a convergence shape in which the inner diameter is narrowed toward the inside of the inner pipe (15).

Referring to FIG. 2 (B), the fastening member 20 is composed of a mounting stud 30 and a mounting nut 40 which are screwed together.

Specifically, the mounting stud 30 includes a head 31 having a tool insertion groove, a bolt outer pressing flange (not shown) formed at one end of the head 31 so as to be concentric with the head 31 with a diameter larger than that of the head 31 A bolt shaft 33 having a diameter smaller than that of the head 31 and extending in a concentric circle with the head 31 and having a screw (not shown) formed on the outer circumferential surface thereof, a head 31 and a bolt shaft 33 And a bolt seat surface body 35 forming a connecting portion of the bolt seat surface body 35. Particularly, the bolt seat surface body 35 is formed of a conical shape of a convergence shape in which the outer diameter is narrowed from the head 31 side to the bolt axis 33.

Specifically, the mounting nut 40 has a hexagonal head 41, a nut outer pressurizing flange 41-1 formed at one end of the head 41 so as to be concentric with the head 41 with a diameter larger than the head 41, And a nut seat surface body 45 protruding in a conical shape of a convergence shape while forming a diameter step with the nut external pressure flange 41-1. In particular, the head 41 and the nut seat surface body 45 are threaded through a threaded hole formed in the inner peripheral surface thereof.

3 shows a subframe 100 in which the subframe 100 is of the type "# " to form four mounting fastening points 100-1, 100-2, 100-3 and 100-4 and four mounting bushes 10 10-2, 10-3, and 10-4 are coupled to the four mounting fastening points 100-1, 100-2, 100-3, and 100-4, respectively.

Specifically, the four mounting fastening points 100-1, 100-2, 100-3, and 100-4 include two rear reference mounting fastening points 100-1 and 100-2 positioned rearward of the vehicle with respect to the vehicle body fastening direction of the sub frame 100, Rear mounting fastening point 100-2 and two front left mounting fastening points 100-3 and 100-4 located at the front of the vehicle and a front right mounting fastening point 100-4. In particular, the rear reference mounting fastening point 100-1 serves as a reference for the rear mounting fastening point 100-2 when the sub frame 100 is fastened.

Specifically, the four mounting bushes 10-1, 10-2, 10-3, and 10-4 include a first mounting bush 10-1 coupled to a rear reference mounting point 100-1, A second mounting bush 10-2 coupled to the fastening point 100-2, a third mounting bushing 10-3 coupled to the front left mounting fastening point 100-3, a front right mounting fastening 100 And a fourth mounting bush 10-4 coupled to the fourth mounting bush 10-4. In this case, each of the first, second, third, and fourth mounting bushings 10-1, 10-2, 10-3, and 10-4 has the same components as those of the mounting bush 10 described in FIGS. . It should be noted that the mounting bushes 10 of the same components are respectively mounted on the rear mounting mounting point 100-1, the rear mounting mounting point 100-2, the front left mounting fastening point 100-3, the front right mounting fastening point The first, second, third, and fourth mounting bushings 10-1, 10-2, 10-3, and 10-4 are merely a name corresponding to the fastening position.

Therefore, the first, second, third, and fourth mounting bushes 10-1, 10-2, 10-3, and 10-4 have the same inner diameter of the inner pipe 15. For example, the four mounting bushes conventionally used have the inner diameter of the inner pipe for the rear reference mounting fastening point 100-1 as a single hole, the inner diameter of the inner pipe for the rear mounting fastening point 100-2 as a slot hole, The inner diameter of each inner pipe for the left mounting fastening point 100-3 and the front right mounting fastening point 100-4 must be different from the inner diameter of the inner pipe 15 in the case of the present embodiment, Hole) can be formed in the same manner. As a result, the number of the mounting bushes 10 is four, and the four first, second, third, and fourth mounting bushings 10-1, 10-2, 10-3, 4), thereby achieving cost reduction.

4 shows a state in which the sub frame 100 is fastened to the vehicle body panel 200 using the mounting bush 10, the mounting stud 30, and the mounting nut 40. FIG. In this case, since the mounting bushes 10 have the same configuration, they are described without being divided into four parts.

As shown in the figure, the rear mounting fastening point 100-2 is positioned with the rear reference mounting fastening point 100-1 as a reference position with the subframe 100 positioned in the body panel 200. [ In this case, the rear mounting fastening point 100-2 may have a position error of + 1T with respect to the rear reference mounting fastening point 100-1 with a positional tolerance of + 2T (T: vehicle longitudinal direction) (A _upper and A _lower ) and upper and lower outer clamping forces (B _upper and B _lower ), respectively.

The mounting stud 30 is passed from the side of the vehicle body panel 200 to the side of the subframe 100 and then the mounting nut 40 is fastened to the side of the subframe 100. The conical bolt seat body 35 of the mounting stud 30 is in close contact with the conical upper seat surface portion 15-1 of the inner pipe 15 and the conical nut seat surface body 45 of the mounting nut 40 And is in close contact with the conical lower seating surface 15-2 of the inner pipe 15.

When the mounting stud 30 and the mounting nut 40 are completely engaged, the bolt outer pressurizing flange 31-1 together with the upper end surface of the inner pipe 15 strongly forms the _upper outer fixing force B _upper The bolt seating surface body 35 is brought into close contact with the upper seating surface 15-1 of the inner pipe 15 to form an _upper inner fixing force A _upper . In addition, the nut outer pressure flange 41-1 forms the _lower end fixing force B _lower with the lower end side surface of the inner pipe 15, and at the same time, the nut seat surface body 45 is engaged with the lower seat bottom surface 15 of the inner pipe 15 -2) so as to form a _lower inner fixing force A _lower .

As a result, the mounting bush 10 forms a double fixed state of the upper / lower inner fixing force A _upper and B _upper and the upper / lower outer fixing force B _upper and B _upper , _upper and B _{upper hold the} mounting stud 30 in the center of the mounting bushing 10 under any external force while absorbing all the positional errors of + 1T due to the conical structure.

The above-described operation is performed in the same manner as the rear-side mounting mounting point 100-1, the rear mounting fastening point 100-2, the front left mounting fastening point 100-3, the front right mounting fastening point 100- 3, and 4 mounting bushings 10-1, 10-2, 10-3, and 10-4, respectively.

5 shows the geometry of the suspension formed by the subframe 100 fastened to the vehicle body panel 200. FIG.

As shown in the figure, the sub-frame 100 is configured such that the rear mounting fastening point 100-2 does not form a positional error with respect to the rear reference mounting fastening point 100-1, The rear mounting clamping point 100-2, the front left mounting clamping point 100-3, and the front right mounting clamping point 100-4, respectively.

As a result, the subframe 100 does not rotate even when an external force is transmitted during driving of the vehicle. In particular, the left suspension 300-1 coupled with the vehicle body panel 200 at the left and right positions of the subframe 100 and the right suspension 300 -2) This geometry can be formed uniformly with no left-right deviation. Therefore, the left and right suspensions 300-1 and 300-2 having the same left and right geometry characteristics improve the vehicle quality deterioration by improving the NVH by blocking the noise generation during the rough driving without adversely affecting the vehicle motion performance.

As described above, the subframe according to the present embodiment includes a mounting bush 10 in which a hollow hole is formed, an upper _upper fixing force A _upper which is in close contact with an inner diameter of the hollow hole, A mounting stud 30 that forms an outer fixing force B _upper and a lower inner fixing force A _{lower that} is in close contact with an inner diameter of the hollow hole and a lower outer fixing force B _{lower that} the mounting bush 10 presses, The mounting stud 30 and the mounting nut 40 are screwed together so that a strong fastening force of the mounting bush 10 and the mounting stud 30 and the mounting nut 40 forming, in particular, maintaining the robustness of the rotating sub-frame 100 relative to the external load is absorbed by the location tolerance yirueojim with the assembly tolerances in the conical structure forming the inner holding force (a _{upper, lower} a) the top / bottom Vehicles made exercise performance and improved NVH.

1: mounting bush unit 10: mounting bush
10-1, 10-2, 10-3, 10-4: 1st, 2nd,
11: outer pipe 13: elastic body
15: inner pipe 15-1, 15-2: upper and lower seat portions
20: fastening member 30: mounting stud
31, 41: head 31-1, 41-1: outer pressurizing flange
33: bolt shafts 35, 45: seating surface body
40: Mounting nut
100: Subframe 100-1: Rear reference mounting point
100-2: Rear mounting point 100-3: Front left mounting point
100-4: Front right mounting point
200: Body panel 300-1, 300-2: Left and right suspension

Claims (10)

Mounting bushes with hollow holes, upper and lower;
A mounting stud which is inserted into the hollow hole at the upper portion to form an upper inner fixing force, and which is engaged with the upper portion;
A mounting nut which is inserted into the hollow hole at the lower portion to form a lower end fixing force and is screwed with the mounting stud in a state of being engaged with the lower portion;
And an inner fixing type mounting bush unit including the inner fixing type mounting bush unit.
[3] The apparatus of claim 1, wherein the mounting bush includes an inner pipe divided into an upper portion and a lower portion together with the hollow hole, wherein the upper inner fixing force is greater than the upper inner mounting force of the inner pipe, And the lower inner fixing force is formed by closely contacting the conical lower seat seat portion of the inner pipe and the conical nut seat seat body of the mounting nut in close contact with each other.
The inner fixing type mounting bush unit according to claim 2, wherein the mounting bush includes an outer pipe around which the inner pipe is wrapped, and a vulcanized molded body is filled between the outer pipe and the inner pipe.
The mounting fixture of claim 2, wherein the mounting stud is formed with a head having a tool insertion groove formed in one side of the bolt seat body, and a bolt shaft is screwed to the mounting nut on the other side. unit.
The bolt presser according to claim 4, wherein a bolt outer pressurizing flange having a diameter larger than that of the head is formed concentrically with the head, the bolt outer pressurizing flange being engaged with the upper portion of the inner pipe, And an upper upper fixing force is applied to an upper portion of the mounting bush unit.
The mounting fixture of claim 2, wherein the mounting nut is formed with a head formed on one side of the nut seat surface body, and a threaded hole formed with a screw is formed on the nut seat surface body and the head, unit.

The nut according to claim 6, wherein a nut outer presser flange having a larger diameter than the head and concentric with the head is formed between the head and the nut seat surface body, the nut outer presser flange is hooked on the lower portion of the inner pipe, And a lower outer fixing force is applied to the lower portion of the mounting bush unit.
A mounting bush unit according to any one of claims 1 to 7;
A mounting fastening point connecting the mounting bush unit to be fastened to the vehicle body panel with the mounting bush unit;
And a sub-frame.
[10] The method of claim 8, wherein the mounting fastening point is divided into a rear reference mounting fastening point, a rear mounting fastening point with the rear reference mounting fastening point as a position error reference, a front left mounting fastening point, and a front right mounting fastening point;
Wherein the mounting bush unit includes four first, second, third, and fourth mounting bushings coupled to the rear reference mounting point, the rear mounting point, the front left mounting point, and the front right mounting point, Four mounting studs coupled to each of the first, second, third, and fourth mounting bushings to be coupled to the vehicle body panel, and four mounting nuts screwed to the respective mounting studs.
[12] The sub-frame according to claim 9, wherein each of the first, second, third, and fourth mounting bushes has a hollow hole for fastening with the vehicle body panel, and the hollow holes have the same size and shape.

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