KR20110061715A - Air damping type bush - Google Patents

Abstract

PURPOSE: An air damping type bush is provided to tune the bush depending on the low-frequency and high-frequency properties of vibration applied to the bush. CONSTITUTION: An air damping type bush comprises an internal member(10), a rubber member(20), an external member, a first chamber(40), a second chamber, and multiple air flowing paths(61,62). The internal member is located at the center of the bush. The rubber member is attached on the internal member. The external member is formed in a cylindrical shape and is located outside the rubber member. The first and second chambers are sealed between the outer surface of the rubber member and the inner surface of the external member. The air flowing paths connect the first and second chambers.

Description

Air damping type bush

The present invention relates to a bush, which is an anti-vibration member that connects and supports an engine and a suspension to a vehicle body and insulates shocks, vibrations, and noises generated from the engine and the suspension so as not to be transmitted to the vehicle body. The present invention relates to an air damping bush that realizes a damping action using a flow of.

In general, noise and vibration are essential as a vehicle moves, and as the technology applied to a vehicle is gradually developed and consumers' demand for low vibration and noise is increased, the impact, vibration, noise, etc. generated in the vehicle are increased. Analysis continues to develop technologies for maximizing ride comfort.

The biggest causes of vibration in cars are the vibration of the engine and the impact transmitted from the road surface while driving. When the vibration generated in the commercial section coincides with the natural frequency of the vehicle body, the resonance occurs and large vibration and impact occur. Therefore, the vibration generated in the vehicle should be manufactured to avoid the natural frequency of the vehicle body. Types of vibration include vibration between stops and vibration during driving. Vibration between stops is a vibration mainly generated during idling. It refers to the shaking of wheels and the bottom of the body, and the automatic vehicle appears more seriously than a manual vehicle. Vibrations include vertical vibrations and circumferential shims at wheels and vehicle shakes at the bottom of the vehicle body.

Suspension or suspension is a device that connects the axle and the body to prevent the body from being damaged by transmitting vibrations or shocks that the axle receives from the ground when the vehicle travels, and improves the ride comfort of the occupant. . A bush is connected to each of the fastening part and the connection part of the suspension system. The bush is installed to minimize the deformation of the suspension system when the vehicle is vibrated or the vehicle body is tilted, and the bush is deformed and recovered according to the compression or tension of the connection to reduce the vibration and tilting.

As the suspension device as described above, the front lower arm of the vehicle uses a three-point fastening method, and the ball joint is fastened to the knuckle portion of the wheel side, and the body mounting is performed so that two points are fastened to the vehicle body on the opposite side thereof. It will have a structure in which a bush (aka A bush) and a geometry bush (aka G bush) are formed.

Among these, the geometry bush is an important factor in determining the performance of the vehicle, and has a unique structure of the geometry bush so as to alleviate the left and right impacts along with the front and rear of the vehicle and maintain the rigidity of the suspension device.

That is, the geometry bush forms a hard port zone (commonly referred to as a bridge) section on the left and right sides to increase left and right stiffness, and soft zones (soft voids) to mitigate front and rear shocks. It is called Void), and it forms an empty space, and it has the characteristic of having both rigidity and ductility.

However, such a geometry bush is very difficult to balance the characteristics of stiffness and ductility, because the softness of the stiffness region is reduced to secure the rigidity, and the softness is reduced to increase the ductility region to maintain the softness. There are hard limits.

In order to solve the problems as described above, a fluid-enclosed bush has been developed and used to enclose a fluid inside the bush to mitigate front and rear shocks, thereby increasing the attenuation of the bush at a specific frequency by using the flow of the enclosed fluid. have.

However, since the conventional fluid-sealed geometry bushes are relatively vulnerable to durability in accordance with their structural characteristics, there is a phenomenon that the geometry bushes break during repeated durability tests, and the cost and weight are greatly increased compared to the conventional rubber bushes. Therefore, there were disadvantages that caused a lot of constraints in the actual design application.

The present invention has been made in order to solve the above-mentioned conventional problems, and there is a technical problem to provide a bush of an air damping method for implementing a damping action by flowing air between a plurality of air chambers.

The configuration of the air damping bush of the present invention for achieving the above technical problem is an inner member located at the center of the vibration damping bush of the vehicle, a rubber member attached to the periphery of the inner member, and the rubber member A cylindrical outer member located outside of the first chamber, a first chamber and a second chamber sealed in the circumferential direction and incorporating air and opposed to each other between an outer circumferential surface of the rubber member and an inner circumferential surface of the outer member; It characterized in that it comprises a plurality of air flow path connecting the second chamber.

Air damping bush of the present invention having the configuration as described above is simpler in structure compared to the conventional fluid-enclosed bush and by using a conventional material, it is relatively durable, cost-effective and advantageous in terms of weight constraints in design There is an effect to reduce.

In addition, by adjusting the cross-sectional area and the length of each of the air flow path formed between the air chamber of the bush of the present invention, it is an advanced invention having the effect of tuning the bush according to the low frequency and high frequency characteristics of the vibration applied to the bush.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of the preferable embodiment of the air damping system bush of this invention is demonstrated in detail based on an accompanying drawing.

However, the disclosed drawings are provided as examples to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the invention is not limited to the drawings presented below, but may be embodied in other aspects.

In addition, unless there is another definition in terms used in the present specification, it has the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs, and the gist of the present invention in the following description and the accompanying drawings. Detailed descriptions of well-known functions and configurations that may be unnecessarily blurred are omitted.

The air damping bush of the present invention includes an inner member positioned at the center, a rubber member attached around the inner member, an outer member positioned to surround an outer circumference of the rubber member, an outer circumferential surface of the rubber member, and an outer member. A pair of air chambers formed between the inner circumferential surfaces, and a plurality of air flow paths interconnecting the respective air chambers between the pair of air chambers and allowing air in one air chamber to flow to the other air chamber. It is characterized by.

In addition, it is characterized in that the size and length of the air flow path can be adjusted to adjust the damping characteristics of the air damping bush of the present invention configured as described above.

1 is a perspective view of the air damping bush of the present invention, Figure 2 is a side view, Figure 3 and Figure 4 is a cross-sectional view taken along line A-A 'and line B-B' of FIG.

1 and 2, an air damping bush according to a preferred embodiment of the present invention includes an inner member 10 positioned at the center, a rubber member 20 attached to the periphery of the inner member 10, and It is configured to include a cylindrical outer member 30 located on the outside of the rubber member 20.

The inner member 10 and the outer member 30 may be made of metal such as iron or aluminum, but synthetic resin may be used in consideration of light weight of the bush.

In addition, a pair of air chambers sealed in the circumferential direction and impregnated with air (air) are formed between the outer circumferential surface of the rubber member 20 and the inner circumferential surface of the outer member 30 to face each other. Specifically, as shown in FIG. 3, the air chamber includes a first chamber 40 formed inside the front of the bush and a second chamber 50 formed inside the rear of the bush.

In this case, the first chamber 40 and the second chamber 50 are interconnected by a plurality of air flow paths 60 as shown in FIGS. 3 and 4.

The air flow path 60 is formed to have different cross-sectional areas and / or different lengths between the inner circumferential surface of the outer member 30 and the outer circumferential surface of the rubber member 30, and the vibration acting as the bush of the present invention is generated. When the volume of one of the chambers of the first chamber 40 or the second chamber 50 is reduced, the air inherent in the chamber of the reduced volume is transferred to the other chamber through the air flow path 60. It is formed to flow into.

Therefore, when the shapes of the respective air flow paths 60 are formed to be different from each other, the air resistance of the air passing through each of the air flow paths 60 is also generated differently. The vibration damping characteristics of the bush according to the present invention, while the amount of air passing through each air flow path (60) also appears different depending on the aspect of the vibration acting on the bush when the flow of air flows to another chamber This is determined.

In the embodiment of the present invention, as shown, the first air flow path 61 connecting one side of the first chamber 40 and one side of the second chamber 50 and the other side of the first chamber 40. And a second air flow path 62 connecting the other side of the second chamber 50 to each other.

The first air flow path 61 has a cross section larger than the second air flow path 62, but the length of the flow path is shorter than the second air flow path 62 (also called 'short flow path'). The second air flow path 62 has a cross-sectional area smaller than the first air flow path 61, but the length of the flow path is longer than the first air flow path 61 (also known as a 'long flow path'). to be.

Since the first air flow path 61 has a large cross-sectional area and a short flow path, the air resistance inside the flow path has a large air resistance against low frequency vibration having a relatively low resonance frequency (that is, air with respect to high frequency vibration). Resistance is small). On the other hand, since the second air flow path 62 has a small cross-sectional area but a long flow path, the inside of the flow path has a large air resistance against high frequency vibration having a relatively high resonance frequency (ie, low frequency vibration). Air resistance is small).

Therefore, when the vibration input to the bush of the present invention is a vibration of a low frequency large displacement, the air inherent in the first chamber 40 or the second chamber 50 is relatively second air having low air resistance to low frequency vibration. Air flows through the flow path 62 (also called 'long flow path').

In addition, when the vibration input to the bush of the present invention is a high frequency urine gas vibration, the air inherent in the first chamber 40 or the second chamber 50 has a relatively small air resistance. Air flows through (also called 'short flow paths').

Therefore, as described above, the amount of air flowing through the plurality of air flow paths 60 formed between the first chamber 40 and the second chamber 50 differs depending on the resonance frequency of the vibration acting on the bush. Therefore, by varying the cross-sectional area and size of the air flow path 60 it is possible to adjust the low frequency and high frequency characteristics of the air damping bush of the present invention.

In the above description, the configuration of the air damping bush of the present invention has been described in detail with reference to the accompanying drawings, but the present invention may be variously modified, changed, and replaced by those skilled in the art, and such modifications, changes, and substitutions may be made by the present invention. It should be interpreted as being within the scope of protection.

1 is a perspective view of an air damping bush of the present invention,

2 is a side view of the present invention air damping bush,

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

4 is a cross-sectional view taken along line BB ′ of FIG. 1.

Explanation of symbols on the main parts of the drawings

One; The present invention air damping bush

10; Inner member

20; Rubber parts

30; Outer part

40; First chamber

50; Second chamber

60; Air flow path

61; First air flow path

62; Second air flow path

Claims (3)

In the vibration damping bush of an automobile, An inner member 10 located at the center, A rubber member 20 attached to the periphery of the inner member 10, A cylindrical outer member 30 positioned outside the rubber member 20, Between the outer circumferential surface of the rubber member 20 and the inner circumferential surface of the outer member 30, the first chamber 40 and the second chamber 50, which are sealed in the circumferential direction, have air embedded therein, and face each other; Air damping bush comprising a plurality of air flow paths (60) connecting the first chamber (40) and the second chamber (50). The air damping bush according to claim 1, wherein the air flow paths are formed to have different cross-sectional areas and / or different lengths. The method of claim 2, wherein the air flow path 60, A first air flow path 61 connecting one side of the first chamber 40 and one side of the second chamber 50, the other side of the first chamber 40, and the second chamber 50. Including a second air flow path 62 connecting the other side, The cross section of the first air flow path 61 is larger than the second air flow path 62, but the length of the flow path is formed shorter than the second air flow path 62, The second air flow path (62) is an air damping bush, characterized in that its cross section is smaller than the first air flow path (61), but the length of the flow path is formed longer than the first air flow path (61).

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