Clearance bushing for vehicle suspension

Abstract

A clearance bushing for a vehicle suspension includes internal projections formed in an inner stopper and external projections formed in an outer stopper. In particular, the internal projections and the external projections are configured to perpendicularly cross each other to allow the internal projections and the external projections to point-contact each other during operation of the suspension. The internal projections are arranged to be non-parallel to each other, and the external projections are arranged to be non-parallel to each other. Thus, a contact area between the internal projections and the external projections is greatly reduced, and a contact wear location therebetween is diversified, thereby improving durability and life of the clearance bushing.

Description

TECHNICAL FIELD

[0001] The present invention relates generally to a void bush for a vehicle suspension. BACKGROUND

[0002] The statements in this section merely provide background information related to the present invention and can not constitute prior art.

[0003] Generally, a vehicle suspension is a device that connects an axle to a vehicle body and prevents vibrations or shocks from a road from being directly transmitted to the vehicle body during travel, thereby preventing damage to the vehicle body or cargo and improving ride comfort.

[0004] A vehicle suspension includes a suspension arm for controlling wheel movement, and the suspension arm is coupled to a bushing to improve ride comfort, steering stability, and shock absorption.

[0005] A conventional bushing is a solid type bushing in which a space between an inner tube and an outer tube is completely filled with a rubber bushing. The solid type bushing is advantageous in steering stability, but has a disadvantage in ride comfort.

[0006] In order to secure steering stability and improve ride comfort, a void bushing has been developed in which a void is provided in a rubber bushing that fills a space between an inner tube and an outer tube.

[0007] However, the applicant found that in a general void bushing, during suspension operation, an inner stopper and an outer stopper, between which a void is formed, are in plane contact with each other, and frictional vibration and noise are generated due to an excessively large contact area. In addition, durability of the bushing is reduced.

[0008] The above description is merely intended to assist in understanding the background of the present invention and does not represent the prior art known to those skilled in the art. SUMMARY

[0009] The present invention proposes a void bush for a vehicle suspension in which, in an inner stopper and an outer stopper having a void provided therebetween, an inner protrusion and an outer protrusion respectively extend to perpendicularly cross each other. The inner protrusion and the outer protrusion are in point contact with each other during suspension operation, thus reducing vibration, noise, and wear of the void bush, and durability of the void bush can be improved.

[0010] In one aspect of the present invention, a void bush for a vehicle suspension includes a rubber bushing and inner and outer stoppers, the rubber bushing being filled between an inner tube and an outer tube and including a void, the inner and outer stoppers being arranged to face each other, the void being located between the inner and outer stoppers. In particular, the inner stopper includes an inner protruding portion, and the outer stopper can have an outer protruding portion. The inner and outer protruding portions can be configured to cross each other; the inner protruding portion can be provided with a plurality of protrusions; the outer protruding portion can be provided with a plurality of protrusions; and among the plurality of inner protrusions, a curvature of an inner protrusion located at a center of the plurality of inner protrusions in a circumferential direction of the inner tube can be greater than a curvature of an inner protrusion located at an outermost side of the plurality of inner protrusions in the circumferential direction.

[0011] Each of the plurality of outer protrusions can have a plurality of inflection points, and curvatures of the plurality of inflection points can vary in the circumferential direction.

[0012] The plurality of inner protrusions and the plurality of outer protrusions can have different curvatures.

[0013] The plurality of inner protrusions and the plurality of outer protrusions can be arranged to cross each other at right angles.

[0014] The plurality of inner protrusions can be arranged not to be parallel to each other by having respective curvatures configured to gradually increase from a circumferentially outermost protrusion to a circumferentially central protrusion.

[0015] Each of the outer protrusions can have four inflection points; and the plurality of outer protrusions can be arranged not to be parallel to each other by each having four inflection points arranged at different positions.

[0016] The inner protrusion can be divided into an actual contact section that can actually contact the outer protrusion and a non-contact section that does not contact the outer protrusion; the outer protrusion can be divided into an actual contact section that can actually contact the inner protrusion and a non-contact section that does not contact the inner protrusion; and the inner protrusion on the actual contact section side of the inner protrusion and the outer protrusion on the actual contact section side of the outer protrusion can have the same height as each other.

[0017] The inner protrusions can be divided into an actual contact section that can actually contact the outer protrusions and a non-contact section that does not contact the outer protrusions; in the actual contact section of the inner protrusions, a curvature of a base formed by connecting lowest points of the inner protrusions on the actual contact section side to each other can be less than or equal to a curvature of a highest portion formed by connecting highest points of the inner protrusions on the actual contact section side to each other; in the non-contact section of the inner protrusions, a curvature of a base formed by connecting lowest points of the inner protrusions on the non-contact section side to each other can be equal to or greater than a curvature of a highest portion formed by connecting highest points of the inner protrusions on the non-contact section side to each other; and in the inner protrusions, the base curvature of the actual contact section and the base curvature of the non-contact section can be connected to each other by an inflection point, whereby the curvatures can be changed.

[0018] The outer protrusions can be divided into an actual contact section that can actually contact the inner protrusions and a non-contact section that does not contact the inner protrusions; in the actual contact section of the outer protrusions, a curvature of a base formed by connecting lowest points of the outer protrusions on the actual contact section side to each other can be less than or equal to a curvature of a highest portion formed by connecting highest points of the outer protrusions on the actual contact section side to each other; in the non-contact section of the outer protrusions, a curvature of a base formed by connecting lowest points of the outer protrusions on the non-contact section side to each other can be equal to or greater than a curvature of a highest portion formed by connecting highest points of the outer protrusions on the non-contact section side to each other; and in the outer protrusions, the base curvature of the actual contact section and the base curvature of the non-contact section can be connected to each other by an inflection point, whereby the curvatures can be changed.

[0019] The plurality of inner protrusions can be configured such that the inner protrusions that are continuously arranged and adjacent to each other can have different cross-sectional areas; and the plurality of outer protrusions can be configured such that the outer protrusions that are continuously arranged and adjacent to each other can have different cross-sectional areas.

[0020] The highest protrusion of each inner protrusion and the highest protrusion of each outer protrusion can have a circular shape of a predetermined curvature.

[0021] Each inner protrusion can extend in a left-right direction that is a through direction of the inner tube, and the plurality of inner protrusions can be arranged in a circumferential direction.

[0022] Each outer protrusion can extend in a circumferential direction, and the plurality of outer protrusions can be arranged in a left-right direction that is a through direction of the inner tube.

[0023] The curvature of each outer protrusion can be greater than the curvature of each inner protrusion.

[0024] As described above, in the void bushing for a vehicle suspension according to the present application, the inner protrusions and the outer protrusions are configured to be perpendicular to each other, and the inner protrusions and the outer protrusions are in point contact with each other during suspension operation. In particular, the inner protrusions are formed to be non-parallel to each other by the change in curvature of the inner protrusions and the inflection point of the outer protrusions, and the outer protrusions are formed to be non-parallel to each other. Thus, the contact area between the inner protrusions and the outer protrusions can be greatly reduced, and the contact wear location between the inner protrusions and the outer protrusions can be diversified. Therefore, the void bushing has an effect in that local wear thereof can be prevented and thus durability and life thereof can be improved.

[0025] In the actual contact sections of the inner protrusions and the actual contact sections of the outer protrusions of the present application, each protrusion has the same height H1 as each other. When the actual contact sections contact each other due to suspension operation, uniform surface pressure can be induced, and thus the void bushing has an effect in that local wear thereof can be prevented and thus durability and life of the void bushing can be improved.

[0026] In the present application, the change in base curvature of the actual contact sections and the non-contact sections of the inner protrusions, the change in base curvature of the actual contact sections and the non-contact sections of the outer protrusions, and the inflection point are utilized, and thus the volume of the rubber bushing can be greatly reduced compared to a conventional bushing. By the above effect, the contraction space can be increased during low-temperature contraction, and thus the gap of the void between the inner stopper and the outer stopper can be greatly reduced under well-joined low-temperature conditions. Therefore, under the same friction load conditions, the initial contact timing and the contact area can be reduced due to the increase in the gap, and thus the void bushing has an effect in that durability and life thereof can be improved.

[0027] The inner protrusions and the outer protrusions, which contact each other during suspension operation, are configured such that the protrusions having different cross-sectional areas contact each other based on the first reference line and the second reference line. Thus, the contact area between the inner protrusions and the outer protrusions can be greatly reduced, and the contact wear location between the inner protrusions and the outer protrusions can be diversified, and thus the void bushing has an effect in that local wear thereof can be prevented and thus durability and life of the void bushing can be improved.

[0028] The highest protrusion of each inner protrusion and the highest protrusion of each outer protrusion are formed to be circular with a predetermined curvature without a flat surface. Thus, the contact area between the inner protrusions and the outer protrusions can be greatly reduced, and thus the void bushing has an effect in that local wear thereof can be prevented and thus durability and life of the void bushing can be improved.

[0029] Other applicable fields will become apparent from the description provided herein. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order that the application can be better understood, various forms thereof will now be described, by way of example, with reference to the accompanying drawings in which:

[0031] Figure 1 is a front view showing a void bush for a vehicle suspension according to one form of the application;

[0032] Figure 2 is a partial perspective view showing a void bush for a vehicle suspension in Figure 1 ;

[0033] Figure 3 is a plan view showing an internal protrusion formed in an inner stopper;

[0034] Figure 4 is a plan view showing an external protrusion formed in an outer stopper;

[0035] Figure 5 is a sectional view showing an inner stopper having an internal protrusion;

[0036] Figure 6 is a sectional view showing an outer stopper having an external protrusion; and

[0037] Figures 7 to 11 is a view showing an internal protrusion and an external protrusion according to some forms of the application.

[0038] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the application in any way. DETAILED DESCRIPTION

[0039] The following description is merely exemplary in nature and is not intended to limit the application, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.

[0040] Hereinafter, a void bush for a vehicle suspension according to an exemplary form of the application will be described with reference to the accompanying drawings.

[0041] In one form of the application, as shown in Figures 1 to 9 , a void bush for a vehicle suspension includes an inner tube 100 having a bore 110 from a first end thereof to a second end thereof, an outer tube 200 located externally of the inner tube 100, and a rubber bush 300 filling a space between the inner tube 100 and the outer tube 200 and having a void 310.

[0042] The rubber bushing 300 has an inner stopper 320 and an outer stopper 330, which are arranged to face each other with the gap 310 located between the inner stopper 320 and the outer stopper 330. The front surface of the inner stopper 320 has a portion formed with internal projections 400, and the front surface of the outer stopper 330 has a portion formed with external projections 500.

[0043] The internal projections 400 and the external projections 500 are arranged to face each other and cross each other at right angles.

[0044] In other words, the internal projections 400 extend in the left-right direction (arrow M1) (i.e., the through direction of the inner tube 100), and include a plurality of internal projections 400 arranged in the circumferential direction (arrow R1). The internal projections 400 have curvatures T1, T2, and the like (refer to FIG. 4) as the internal projections are disposed from the opposite ends thereof toward the central portion between the opposite ends. Figure 3 ).

[0045] In the internal projections 400, the curvature T1 of one of the internal projections 400 located outermost in the circumferential direction of the internal projections 400 is the smallest curvature (a curvature of R600 or more). Also, the curvature T2 of one of the internal projections 400 located central in the circumferential direction of the internal projections 400 is the largest curvature (a curvature of R900 or more). Since the curvatures of the internal projections 400 gradually increase from the outermost projections having the smallest curvature to the central side projections having the largest curvature, the plurality of internal projections 400 are configured to be non-parallel to each other.

[0046] The external projections 500 extend in the circumferential direction (arrow R1), and include a plurality of external projections 500 arranged in the left-right direction (arrow M1). The external projections 500 have curvatures S1 and the like, which curve as the external projections are disposed from the opposite ends in the circumferential direction (arrow R1) toward the central portion between the opposite ends (refer to FIG. 5). Figure 4 ).

[0047] Each of the external projections 500 has four inflection points X1, X2, X3, and X4, whose curvatures change in the circumferential direction. The plurality of external projections 500 are disposed to be non-parallel to each other because they respectively have the four inflection points X1, X2, X3, and X4 disposed at different positions.

[0048] The curvatures T1, T2, and the like of the internal projections 400 and the curvatures S1 and the like of the external projections 500 are formed to be different from each other. In one form, the external projections 500 are formed to have a curvature of R1000 or more, thereby having a larger curvature than the curvatures of the internal projections 400.

[0049] Accordingly, the inner protrusions 400 and the outer protrusions 500 are formed in perpendicular directions to each other, such that the inner protrusions 400 and the outer protrusions 500 are in point contact with each other during suspension operation. In particular, due to the curvature variation of the inner protrusions 400 and the outer protrusions 500 and the inflection points X1, X2, X3, and X4 of each outer protrusion 500, the inner protrusions 400 are formed to be non-parallel to each other, and the outer protrusions 500 are formed to be non-parallel to each other. Accordingly, the contact area between the inner protrusions 400 and the outer protrusions 500 can be greatly reduced, and the contact wear location between the inner protrusions 400 and the outer protrusions 500 can be diversified, so that local wear of the clearance bushing can be prevented, and by preventing wear, durability and lifespan of the clearance bushing can be improved.

[0050] As shown in FIGS. 1 and 2, the inner protrusions 400 and the outer protrusions 500 are formed in the same direction, and the inner protrusions 400 and the outer protrusions 500 are formed to be parallel to each other. Figure 5 and Figure 6 As shown in FIGS. 1 and 2, the inner protrusions 400 and the outer protrusions 500 are formed in the same direction, and the inner protrusions 400 and the outer protrusions 500 are formed to be parallel to each other.

[0051] The protrusion height H1 of the actual contact section 410 of the inner protrusions 400 and the protrusion height H1 of the actual contact section 510 of the outer protrusions 500 are formed to have the same size. In addition, the protrusion height of the non-contact section 420 of the inner protrusions 400 and the protrusion height of the non-contact section 520 of the outer protrusions 500 can be formed to have the same size or different sizes.

[0052] When the actual contact section 410 of the inner protrusions 400 and the actual contact section 510 of the outer protrusions 500 are formed to have the same size as the protrusion height H1, the actual contact section 410 of the inner protrusions 400 and the actual contact section 510 of the outer protrusions 500 are brought into contact with each other by suspension operation, thereby causing uniform surface pressure. Accordingly, local wear of the clearance bushing can be prevented, so that durability and lifespan of the clearance bushing can be improved.

[0053] As shown in FIGS. 1 and 2, the inner protrusions 400 and the outer protrusions 500 are formed in the same direction, and the inner protrusions 400 and the outer protrusions 500 are formed to be parallel to each other. Figure 7As shown, in the actual contact section 410 of the inner protrusion 400, the curvature V1 of the base formed by connecting the lowest points of the inner protrusion on the actual contact section side to each other is less than or equal to the curvature W1 of the highest portion formed by connecting the highest points of the inner protrusion on the actual contact section side. In the non-contact section 420 of the inner protrusion 400, the curvature V2 of the base formed by connecting the lowest points of the inner protrusion on the non-contact section side to each other is equal to or greater than the curvature W2 of the highest portion formed by connecting the highest points of the inner protrusion on the non-contact section side to each other. In the inner protrusion 400, the base curvature V1 of the actual contact section 410 and the base curvature V2 of the non-contact section 420 are connected to each other by the inflection points X5 and X6, thereby changing the curvature.

[0054] As shown in FIG. 4, the inner protrusion 400 is formed in the inner surface 340 of the inner stopper 320. The inner protrusion 400 is formed in the inner surface 340 of the inner stopper 320 in the form of a plurality of protrusions arranged in a circular pattern. The inner protrusion 400 is formed in the inner surface 340 of the inner stopper 320 in the form of a plurality of protrusions arranged in a circular pattern. Figure 8 As shown, in the actual contact section 510 of the outer protrusion 500, the curvature V3 of the base formed by connecting the lowest points of the outer protrusion on the actual contact section side to each other is less than or equal to the curvature W3 of the highest portion formed by connecting the highest points of the outer protrusion on the actual contact section side. In the non-contact section 520 of the outer protrusion 500, the curvature V4 of the base formed by connecting the lowest points of the outer protrusion on the non-contact section side to each other is equal to or greater than the curvature W4 of the highest portion formed by connecting the highest points of the outer protrusion on the non-contact section side to each other. In the outer protrusion 500, the base curvature V3 of the actual contact section 510 and the base curvature V4 of the non-contact section 520 are connected to each other by the inflection points X7 and X8, thereby changing the curvature.

[0055] With the change in the base curvatures V1 and V2 in the actual contact section 410 and the non-contact section 420 of the inner protrusion 400, the change in the base curvatures V3 and V4 in the actual contact section 510 and the non-contact section 520 of the outer protrusion 500, and the inflection points X5, X6, X7, and X8 in the clearance bushing, the volume of the rubber bushing 300 can be greatly reduced compared to a conventional bushing. Through the above effect, the contraction space can be increased during low-temperature contraction, and thus the gap of the clearance 310 between the inner stopper 320 and the outer stopper 330 can be greatly reduced under well-joined low-temperature conditions. Accordingly, under the same friction load conditions, the initial contact timing and the contact area can be reduced due to the increase in the gap, and thus the durability and the lifespan of the clearance bushing can be improved.

[0056] As shown in FIG. 4, the inner protrusion 400 is formed in the inner surface 340 of the inner stopper 320. The inner protrusion 400 is formed in the inner surface 340 of the inner stopper 320 in the form of a plurality of protrusions arranged in a circular pattern. The inner protrusion 400 is formed in the inner surface 340 of the inner stopper 320 in the form of a plurality of protrusions arranged in a circular pattern. Figure 9 Figure 10 As shown, according to a form of the present application, the plurality of inner protrusions 400 are configured such that the inner protrusions arranged in succession and adjacent to each other are formed to have different cross-sectional areas.

[0057] ​The internal protrusions 400 are formed to have cross-sectional areas al, a2, a3, etc. that are continuously connected to each other, and one of the internal protrusions 400 is formed to have a cross-sectional area that is different from that of the internal protrusions adjacent thereto. In other words, the cross-sectional area a3 and the adjacent cross-sectional areas a2 and a4 are formed to be different from each other.

[0058] Among the plurality of external protrusions 500, the external protrusions that are continuously arranged and adjacent to each other are formed to have different cross-sectional areas.

[0059] The external protrusions 500 are formed to have cross-sectional areas bl, b2, b3, etc. that are continuously connected to each other, and one of the external protrusions 500 is formed to have a cross-sectional area that is different from that of the external protrusions adjacent thereto. In other words, the cross-sectional area b3 and the adjacent cross-sectional areas b2 and b4 are formed to be different from each other.

[0060] Therefore, the internal protrusions 400 and the external protrusions 500 that contact each other during operation of the suspension have a configuration in which protrusions having different cross-sectional areas contact each other. Thus, the contact area between the internal protrusions 400 and the external protrusions 500 can be greatly reduced, and the contact wear location between the internal protrusions 400 and the external protrusions 500 can be diversified, so that local wear of the clearance bushing can be prevented, and thus the durability and the life of the clearance bushing can be improved.

[0061] The internal protrusions 400 and the external protrusions 500 can be formed to have cross-sectional areas of various sizes.

[0062] As shown in FIG. 1, according to the present application, the highest protrusions of each of the internal protrusions 400 and the highest protrusions of each of the external protrusions 500 are formed to have a predetermined curvature without a flat surface. Thus, the contact area between the internal protrusions 400 and the external protrusions 500 can be greatly reduced, so that local wear of the clearance bushing can be prevented, and thus the durability and the life of the clearance bushing can be improved. Figure 11 As described above, in the clearance bushing according to the present application, the internal protrusions 400 and the external protrusions 500 are configured to be perpendicular to each other, and the internal protrusions 400 and the external protrusions 500 point-contact each other during operation of the suspension. In particular, by the curvature variation of the internal protrusions 400 and the external protrusions 500 and the inflection points X1, X2, X3, and X4 of the external protrusions 500, the internal protrusions 400 are formed to be non-parallel to each other, and the external protrusions 500 are formed to be non-parallel to each other. Thus, the contact area between the internal protrusions 400 and the external protrusions 500 can be greatly reduced, and the contact wear location between the internal protrusions 400 and the external protrusions 500 can be diversified. Therefore, local wear of the clearance bushing can be prevented, and thus the durability and the life of the clearance bushing can be improved.

[0063]

[0064] ​In the actual contact sections 410 and 510 of the inner protrusions 400 and the outer protrusions 500 of the present application, each protrusion has the same height H1 as each other. When the actual contact sections 410 and 510 contact each other due to suspension work, uniform surface pressure can be induced, thereby preventing local wear of the gap bushing, and thus improving durability and lifespan of the gap bushing.

[0065] In the present application, the variations in the base curvatures V1 and V2 in the actual contact sections 410 and the non-contact sections 420 of the inner protrusions 400, the variations in the base curvatures V3 and V4 in the actual contact sections 510 and the non-contact sections 520 of the outer protrusions 500, and the inflection points X5, X6, X7, and X8 are utilized, thereby greatly reducing the volume of the rubber bushing 300 compared to conventional bushings. Through the above effects, the contraction space can be increased during low-temperature contraction, and thus the gap of the gap 310 between the inner stopper 320 and the outer stopper 330 can be greatly reduced under well-joined low-temperature conditions. Accordingly, under the same friction load conditions, the initial contact timing and the contact area can be reduced due to the increased gap, thereby improving durability and lifespan of the gap bushing.

[0066] The inner protrusions 400 and the outer protrusions 500, which contact each other during suspension work, are configured such that the protrusions having different cross-sectional areas contact each other based on the first reference line L1 and the second reference line L2. Accordingly, the contact area between the inner protrusions 400 and the outer protrusions 500 can be greatly reduced, and the contact wear locations between the inner protrusions 400 and the outer protrusions 500 can be diversified, thereby preventing local wear of the gap bushing, and thus improving durability and lifespan of the gap bushing.

[0067] The highest protrusion of each inner protrusion 400 and the highest protrusion of each outer protrusion 500 are formed in a circular shape R3 having a predetermined curvature without a flat surface. Accordingly, the contact area between the inner protrusions 400 and the outer protrusions 500 can be greatly reduced, thereby preventing local wear of the gap bushing, and thus improving durability and lifespan of the gap bushing.

[0068] While example forms of the present application have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the application as disclosed in the accompanying claims.

Claims

1. A void bush for a vehicle suspension, the void bush comprising: a rubber bush filled between an inner tube and an outer tube and including a void; and an inner stopper and an outer stopper arranged to face each other with the void located between the inner stopper and the outer stopper, wherein: the inner stopper includes an inner protruding portion, and the outer stopper includes an outer protruding portion, the inner protruding portion and the outer protruding portion are configured to cross each other, the inner protruding portion is provided with a plurality of inner protrusions, the outer protruding portion is provided with a plurality of outer protrusions, in the plurality of inner protrusions, one inner protrusion located in the center of the plurality of inner protrusions in a circumferential direction of the inner tube has a curvature greater than that of one inner protrusion located at the outermost side of the plurality of inner protrusions in the circumferential direction; in the plurality of inner protrusions, inner protrusions of the plurality of inner protrusions are arranged to be non-parallel to each other by having respective curvatures configured to gradually increase from the circumferentially outermost protrusion to the circumferentially central side protrusion. each outer protrusion of the plurality of outer protrusions has a plurality of inflection points having curvatures varying in the circumferential direction.

2. The voided bushing for a vehicle suspension of claim 1, wherein, the plurality of inner protrusions and the plurality of outer protrusions have different curvatures.

3. The voided bushing for a vehicle suspension of claim 1 wherein, the plurality of inner protrusions and the plurality of outer protrusions are arranged to cross each other at right angles.

4. The voided bushing for a vehicle suspension of claim 1 wherein, each outer protrusion of the plurality of outer protrusions has four inflection points; 5. The voided bushing for a vehicle suspension of claim 2 wherein, outer protrusions of the plurality of outer protrusions are arranged to be non-parallel to each other by each having four inflection points arranged at different positions. inner protrusions of the plurality of inner protrusions are divided into actual contact sections actually contacting outer protrusions of the plurality of outer protrusions and non-contact sections not contacting the outer protrusions; 6. The voided bushing for a vehicle suspension of claim 1 wherein, the outer protrusions are divided into actual contact sections actually contacting the inner protrusions and non-contact sections not contacting the inner protrusions; inner protrusions of the actual contact section side among the inner protrusions and outer protrusions of the actual contact section side among the outer protrusions have the same height as each other. inner protrusions of the plurality of inner protrusions are divided into actual contact sections actually contacting outer protrusions of the plurality of outer protrusions and non-contact sections not contacting the outer protrusions; 7. The voided bushing for a vehicle suspension of claim 1 wherein, in the actual contact sections of the inner protrusions, a curvature of a base formed by connecting lowest points of the inner protrusions of the actual contact section side to each other is smaller than or equal to a curvature of a highest portion formed by connecting highest points of the inner protrusions of the actual contact section side to each other; in the non-contact sections of the inner protrusions, a curvature of a base formed by connecting lowest points of the inner protrusions of the non-contact section side to each other is equal to or greater than a curvature of a highest portion formed by connecting highest points of the inner protrusions of the non-contact section side to each other; and in the inner protrusions, the base curvature of the actual contact section and the base curvature of the non-contact section are connected to each other by an inflection point, thereby changing the curvature. outer protrusions of the plurality of outer protrusions are divided into actual contact sections actually contacting inner protrusions of the plurality of inner protrusions and non-contact sections not contacting the inner protrusions. ​ 8. The voided bushing for a vehicle suspension of claim 1 wherein, ​ In the actual contact section of the outer protrusion, a curvature of a base formed by connecting the lowest points of the outer protrusion on the actual contact section side to each other is less than or equal to a curvature of a highest portion formed by connecting the highest points of the outer protrusion on the actual contact section side to each other; In the non-contact section of the outer protrusion, a curvature of a base formed by connecting the lowest points of the outer protrusion on the non-contact section side to each other is equal to or greater than a curvature of a highest portion formed by connecting the highest points of the outer protrusion on the non-contact section side to each other; In the outer protrusion, the base curvature of the actual contact section and the base curvature of the non-contact section are connected to each other by an inflection point, thereby changing the curvature.

9. The voided bushing for a vehicle suspension of claim 1 wherein, The internal protrusions of the plurality of internal protrusions are configured such that the internal protrusions that are continuously arranged and adjacent to each other have different cross-sectional areas; and The external protrusions of the plurality of external protrusions are configured such that the external protrusions that are continuously arranged and adjacent to each other have different cross-sectional areas.

10. The voided bushing for a vehicle suspension of claim 1 wherein, The highest protrusions of each of the plurality of internal protrusions and each of the plurality of external protrusions respectively have a circular shape of a predetermined curvature.

11. The voided bushing for a vehicle suspension of claim 1 wherein, Each of the plurality of internal protrusions extends in a left-right direction that is a through direction of the inner tube, and the plurality of internal protrusions are arranged in a circumferential direction.

12. The voided bushing for a vehicle suspension of claim 1 wherein, Each of the plurality of external protrusions extends in a circumferential direction, and the plurality of external protrusions are arranged in a left-right direction that is a through direction of the inner tube.

13. The voided bushing for a vehicle suspension of claim 1 wherein, A curvature of each of the plurality of external protrusions is greater than a curvature of each of the plurality of internal protrusions.

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