Double compression ratio type bush and suspension system thereby

Patent metadata

Field	Value
Publication number	US-2018326804-A1
Application number	US-201815867467-A
Country	US
Kind code	A1
Filing date	Jan 10, 2018
Priority date	May 10, 2017
Publication date	Nov 15, 2018
Grant date	—

Abstract

A bushing may include an elastic compression portion configured to form a primary compression ratio due to a compressive deformation by a primary press-fitting load and be pressed by a secondary compression ratio greater than the primary compression ratio by a secondary press-fitting load greater than the primary press-fitting load, wherein the elastic compression portion is formed in an opened cross section to be a secondary surface contact larger than a primary surface contact without a bulge phenomenon by a volume dispersion in a state in which it is pressed by the primary press-fitting load to be the primary surface contact and then is pressed by the secondary press-fitting load.

First claim

What is claimed is:

1 . A bushing, comprising:
an elastic compression portion configured to form a primary compression ratio due to a compressive deformation by a primary press-fitting load and be pressed by a secondary compression ratio greater than the primary compression ratio by a secondary press-fitting load greater than the primary press-fitting load, wherein the elastic compression portion is formed in an opened cross section to be a secondary surface contact greater than a primary surface contact without a bulge phenomenon by a volume dispersion when the elastic compression portion is pressed by the primary press-fitting load to be the primary surface contact and then is pressed by the secondary press-fitting load.

2 . The bushing of claim 1 , wherein the elastic compression portion is formed at a first end portion and a second end portion of an elastic body, respectively, and forms the opened cross section by setting a difference between a radial stiffness length and a torsional stiffness length of the elastic body to be 20 to 30%.

3 . The bushing of claim 1 , wherein the secondary compression ratio is set to be 170 to 260% as compared to the primary compression ratio.

4 . The bushing of claim 1 , wherein the opened cross section is configured of clamp-shaped cross-section portion continuously forming the primary compression ratio and the secondary compression ratio and a clamp notch cross-section portion extending from the clamp-shaped cross-section portion to solve the bulge phenomenon due to the secondary compression ratio and remove a stress concentration.

5 . The bushing of claim 4 , wherein the clamp notch cross section portion is formed as an opened region at a notch portion of the clamp-shaped cross-section portion.

6 . The bushing of claim 4 , wherein the clamp notch cross-section portion has one of a ‘U’-shaped cross section, a circular cross section, an oval cross section, and a polygonal cross section.

7 . The bushing of claim 4 , wherein the upper clamp-shaped cross-section portion is expanded at an upper opening angle above a notch virtual central line formed by the clamp notch cross-section portion to form a length of an upper rubber adhering portion and the lower clamp-shaped cross-section portion is expanded at a lower opening angle under the notch virtual central line to form a length of a lower rubber adhering portion.

8 . The bushing of claim 7 , wherein the upper opening angle is greater than the lower opening angle.

9 . The bushing of claim 7 , wherein the length of the upper rubber adhering portion includes an upper opening surface forming the upper opening angle and an upper connecting surface extending from the upper opening surface at an angle different from the upper opening angle, and the length of the lower rubber adhering portion includes a lower opening surface forming the lower opening angle and a lower connecting surface extending from the lower opening surface at an angle different from the lower opening angle.

10 . The bushing of claim 9 , wherein the lower opening surface is formed at a length out of the upper connecting surface.

11 . The bushing of claim 9 , wherein an angle formed by the upper connecting surface and an upper surface of the elastic compression portion is set to be less than an angle formed by the opening surface and the upper surface.

12 . The bushing of claim 9 , wherein an angle formed by the lower connecting surface and a lower surface of the elastic compression portion is set to be less than an angle formed by the opening surface and the lower surface.

13 . A suspension system, comprising:
suspension arms having bushing holes formed at predetermined sides thereof; and a bushing configured to be integrated with an internal pipe wrapped with an external pipe by vulcanization, including an elastic body formed at predetermined sides thereof, the elastic body having first and second elastic compression portion that has a clamp-shaped cross section increasing a compression ratio in a response to an increase in a press-fitting load, and have the external pipe press-fitted in the bushing hole.

14 . The suspension system of claim 13 , wherein the elastic body sets a torsional stiffness length to be 0.70 to 0.80 of a radial stiffness length when a clamp width interval of the first elastic compression portion and the second elastic compression portion is set to be the radial stiffness length and clamp forming locations of the first elastic compression portion and the second elastic compression portion are configured to be the torsional stiffness length.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Pyung Hwa Ind Co Ltd

Inventors

• Sung Dae-Un
• Park Jun-Hyeong
• Ryu Yong-Hyun
• Lim Soo-Hyun

Classifications

• B60G2204/1484

  on an intermediate upright strut upon which the stub axle is pivoted · CPC title

• B60G3/06

  the arm being rigid · CPC title

• B60G7/02 Primary

  Attaching arms to sprung part of vehicle {(B60G7/006 takes precedence)} · CPC title

• F16F1/3856

  Vulcanisation or gluing of interface between rigid and elastic sleeves · CPC title

• F16F1/3807

  characterised by adaptations for particular modes of stressing · CPC title