Suspension bushing

Abstract

The present invention relates to a suspension bushing used in a vehicle, and is a technology for minimizing the frequency shift caused by the change of dynamic characteristics under the load acting on the suspension. The present invention provides a suspension bushing, characterized in that it includes: an outer tube; an inner tube installed inside the outer tube; a rubber installed between the outer tube and the inner tube; a mass body installed inside the rubber, which adopts a tubular form with an opening portion through which a part of the outer peripheral surface is formed; and a stopper, which adopts a form that protrudes to the outside of the inner tube and penetrates the opening portion; thereby, the mutual interference between the mass body and the stopper when deformation occurs due to external force is minimized.

Description

Technical Field

[0001] The present invention relates to a suspension bushing used in a vehicle, and is a technology for minimizing frequency shift caused by changes in dynamic characteristics under load input to the suspension. Background Art

[0002] Suspension bushings are used in vehicles and are generally composed of an outer tube, an inner tube, and rubber inserted between the outer tube and a mass body is added inside the rubber to reinforce the rigidity.

[0003] In particular, depending on the degree to which the accelerator is depressed during the driving of the electric vehicle, the suspension will also be subjected to a load in the Z direction due to the engine torque, resulting in a change in the dynamic characteristics, and the first-order resonance frequency in the frequency band below 500 Hz generated by the mass will move backward and further cause the dynamic characteristics to be amplified, thereby causing problems of adverse effects on the noise and vibration of the vehicle.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent document 1: KR10-1124595 B1 Summary of the invention

[0007] In order to solve the existing problems as described above, the purpose of the present invention is to provide a suspension bushing that can minimize the frequency shift caused by the mass of the suspension bushing and thereby improve noise and vibration even when the suspension bushing is subjected to a load in the main direction due to the driving conditions of the vehicle and thus causes its dynamic characteristics to change.

[0008] In order to solve the above-mentioned problems, the present invention provides a suspension bushing, characterized in that it includes: an outer tube; an inner tube installed inside the above-mentioned outer tube; rubber installed between the above-mentioned outer tube and the above-mentioned inner tube; a mass body installed inside the above-mentioned rubber and adopting a tubular form with an opening portion that passes through a part of the outer peripheral surface; and a limiter, which is in a form that protrudes to the outside of the above-mentioned inner tube and passes through the above-mentioned opening portion; thereby, the mutual interference between the above-mentioned mass body and the above-mentioned limiter when deformation occurs due to external force is minimized.

[0009] The rubber is characterized by comprising: a central portion for wrapping the mass body; a first connecting portion for connecting the central portion with the outer tube; and a second connecting portion for connecting the central portion with the inner tube.

[0010] The above mass body is characterized in that an auxiliary mass body attached to the outer peripheral surface is also installed.

[0011] The outer tube is characterized in that a buffer rubber is formed at a position corresponding to the stopper.

[0012] Through the solution described above, the following effects can be achieved.

[0013] By separating the mass body and the stopper provided in the suspension bushing as much as possible, the peak frequency can be maintained at the same level even when the external load changes, thereby preventing the occurrence of noise and vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view of a suspension bushing applicable to an embodiment of the present invention.

[0015] Figure 2 It is an isolated view of a suspension bushing according to an embodiment of the present invention.

[0016] Figure 3 It is a diagram showing the internal structure of a suspension bushing according to an embodiment of the present invention.

[0017] Figure 4 It is a front view of a suspension bushing applicable to an embodiment of the present invention.

[0018] Figure 5 This is an illustrative diagram of a mass body of a suspension bushing according to an embodiment of the present invention.

[0019] Figure 6 FIG. 1 is another exemplary diagram of a mass body of a suspension bushing according to an embodiment of the present invention.

[0020] Figure 7 (a) is a diagram of the deformation state of the existing suspension bushing based on the load.

[0021] Figure 7 (b) is a diagram showing the deformation state of the suspension bushing according to the load.

[0022] FIG8( a ) is a frequency deformation diagram of a conventional suspension bushing.

[0023] FIG. 8( b ) is a frequency deformation diagram of a suspension bushing to which the present invention is applied.

[0024] Description of reference numerals:

[0025] 100: External pipe

[0026] 200: Inner tube

[0027] 300: Rubber

[0028] 320: Central Department

[0029] 340: First connection

[0030] 360: Second connection

[0031] 400: Mass body

[0032] 420: Opening

[0033] 440: Auxiliary mass

[0034] 500: Limiter

[0035] 380: Buffer rubber. DETAILED DESCRIPTION

[0036] Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following description and the accompanying drawings are only intended to help the overall understanding of the present invention, and the technical scope of the present invention is not limited thereby. In addition, detailed descriptions of known structures and functions that may make the gist of the present invention unclear will be omitted.

[0037] Figure 1 is a perspective view of a suspension bushing according to an embodiment of the present invention. Figure 2 is an isolated view of a suspension bushing according to an embodiment of the present invention. Figure 3 1 is a diagram showing the internal structure of a suspension bushing according to an embodiment of the present invention. Figure 4 is a front view of a suspension bushing according to an embodiment of the present invention. Figure 5 is an illustrative diagram of a mass body of a suspension bushing according to an embodiment of the present invention. Figure 6 FIG. 1 is another exemplary diagram of a mass body of a suspension bushing according to an embodiment of the present invention.

[0038] also, Figure 7 (a) is the deformation state diagram of the existing suspension bushing based on load. Figure 7 FIG. 8( b ) is a diagram showing the deformation state of the suspension bushing according to the present invention based on load, FIG. 8( a ) is a diagram showing the frequency deformation of the existing suspension bushing, and FIG. 8( b ) is a diagram showing the frequency deformation of the suspension bushing according to the present invention.

[0039] See also Figures 1 to 4 The suspension bushing applicable to the present invention generally includes an outer tube 100, an inner tube 200, a rubber 300, a mass body 400 and a limiter 500. The present invention is characterized in that the frequency shift can be minimized and the noise and vibration of the vehicle can be reduced by minimizing the mutual interference between the mass body 400 and the limiter 500 when an external load is applied.

[0040] Next, each configuration of the present invention will be described in sequence.

[0041] First, the outer tube 100 corresponds to the outer shape of the suspension bushing and is formed in a tubular shape, and may also be in a semicircular combination.

[0042] Next, the inner pipe 200 is installed inside the outer pipe 100, formed in a tubular shape.

[0043] Furthermore, the rubber 300 is installed between the outer tube 100 and the inner tube 200, and can absorb impact and vibration due to elasticity.

[0044] Specifically, the rubber 300 includes: a central portion 400, which is annular in shape and is used to wrap the mass body 400 internally; a plurality of first connecting portions 340, which are radially arranged in a manner of connecting the central portion 320 to the outer tube 100; and second connecting portions 360, which are radially arranged in a manner of connecting the central portion 320 to the inner tube 200.

[0045] The first connection portion 340 may include: a leg portion that is spaced a certain distance from the central portion 320 and protrudes outward; and an outermost portion that is formed in a shape corresponding to the inner circumference of the outer tube 100. In addition, the second connection portion 320 may include: a leg portion that is spaced a certain distance from the central portion 320 and protrudes inward; and an innermost portion that is formed in a shape corresponding to the outer circumference of the inner tube 100.

[0046] Furthermore, the mass body 400 is a block (mass), which is a part that is installed in the rubber 300 in a tubular form to reinforce its rigidity. At this time, an opening portion 420 that penetrates a part of the outer peripheral surface is formed in the mass body 400. The opening portion 420 is a through hole formed on the outer peripheral surface of the tubular shape, which is used to provide a movement channel for the stopper 500 described later.

[0047] The mass body 400 is currently in a "C" shape, but in order to prevent its own resonance, in the present invention, one end is connected to the leg to further strengthen its rigidity, and the other end can also be in a "C" shape. Figure 6 The form shown is further connected to the legs.

[0048] In addition, an auxiliary mass body 440 attached by welding may be installed on the outer peripheral surface of the mass body 400 to further increase its mass. In the present invention, the mass body 400 is manufactured by a stamping process in consideration of manufacturing cost.

[0049] Finally, the stopper 500 is formed in a form that protrudes toward the outside of the inner tube 200 and passes through the opening 420 of the mass body 400 .

[0050] Thereby, when deformation occurs due to external force, the above-mentioned limiter 500 can move through the opening portion 420 of the above-mentioned mass body 400 without direct contact with the above-mentioned mass body 400, thereby minimizing mutual interference and further minimizing the frequency increase acting on the mass body 400 under dynamic load.

[0051] The outer tube 100 is characterized in that a buffer rubber 380 is formed at a position corresponding to the stopper 500 , so as to absorb the impact of the stopper 500 .

[0052] Next, in Figure 7 FIG. 8 also compares the difference in load between the conventional suspension bushing and the suspension bushing to which the present invention is applied.

[0053] exist Figure 7 In (a), when the load acts on the existing suspension bushing, the stopper 500 is closely attached to the mass body 400 and is affected by the load. Figure 7 In (b), when a load acts on the suspension bushing to which the present invention is applied, the stopper 500 does not exert a load on the mass body 400 .

[0054] In Figure 8(a), when the load acts on the existing suspension bushing, its dynamic characteristics will also change accordingly, and the frequency of the first-order resonance of about 500 Hz caused by the mass body will move successively and further lead to the amplification of the dynamic characteristics, thereby adversely affecting the vibration and noise (NVH, noise, vibration, harshness) of the vehicle.

[0055] However, as shown in FIG. 8( b ), the present invention can minimize the frequency shift and thereby reduce vibration and noise by separating the mass body and the stopper as much as possible even when subjected to a load in the Z direction.

[0056] As described above, the present invention is based on the installation of the bushing as its basic technical concept, and within the scope of the basic concept of the present invention as described above, a person having general knowledge in this industry can make various modifications thereto.

Claims

1. A suspension bushing, characterized in that: include: External pipe; An inner tube, installed inside the outer tube; Rubber, installed between the outer tube and the inner tube; A mass body is installed inside the rubber and has a tubular shape with an opening formed in which a part of the outer peripheral surface penetrates in the shape of a square hole; and A stopper is in the form of protruding toward the outside of the inner tube and penetrating the opening; Thereby, when deformation occurs due to the external load, the stopper moves through the opening, so that the mutual interference between the mass body and the stopper is minimized. The above rubber includes: a central portion for wrapping the mass body; a first connecting portion for connecting the central portion to the outer tube; and a second connecting portion for connecting the central portion to the inner tube. The central portion is provided to be separated from the outer tube and the inner tube by the first connecting portion and the second connecting portion.

2. The suspension bushing according to claim 1, characterized in that: The above mass body, An auxiliary mass body attached to the outer peripheral surface is also installed.

3. The suspension bushing according to claim 1, characterized in that: The outer tube, A buffer rubber is also formed at a position corresponding to the above-mentioned stopper.

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