Double compression ratio type bush and suspension system thereby

Patent metadata

Field	Value
Publication number	US-10792968-B2
Application number	US-201815867467-A
Country	US
Kind code	B2
Filing date	Jan 10, 2018
Priority date	May 10, 2017
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

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 at a first end portion and a second end portion of an elastic body, respectively, and a size of an opened cross section formed by the elastic compression portion is 20% to 30% of difference between a radial stiffness length and a torsional stiffness length of the elastic body.

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

3. The bushing of claim 1 , wherein the opened cross section is configured of a cross section portion continuously forming the primary compression ratio and the secondary compression ratio and a notch cross section portion extending from the cross section portion to remove a stress concentration.

4. The bushing of claim 3 , wherein the notch cross section portion is formed as an opened region at a notch portion of the cross section portion.

5. The bushing of claim 3 , wherein the notch cross section portion has one of a circular cross section, an oval cross section, and a polygonal cross section.

6. The bushing of claim 3 , wherein an upper cross section portion of the cross section portion is expanded at an upper opening angle to form a length of an upper rubber adhering portion and a lower cross section portion of the cross section portion is expanded at a lower opening angle to form a length of a lower rubber adhering portion.

7. The bushing of claim 6 , wherein the upper opening angle is greater than the lower opening angle.

8. The bushing of claim 6 , 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.

9. The bushing of claim 8 , wherein the lower opening surface is formed at a length out of the upper connecting surface.

10. The bushing of claim 8 , 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 upper opening surface and the upper surface.

11. The bushing of claim 8 , 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 lower opening surface and the lower surface.

12. 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 portions that have a 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 holes,
wherein the elastic body sets a torsional stiffness length of the first and second elastic compression portions to be 0.70 ratio to 0.80 ratio of a radial stiffness length of the first and second elastic compression portions.

13. 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 secondary compression ratio is set to be 170% to 260% as compared to the primary compression ratio.

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

• B60G2204/14

  Mounting of suspension arms · CPC title

• B60G7/00 Primary

  Pivoted suspension arms; Accessories thereof (means for maintaining substantially constant wheel camber during suspension movement B60G3/26; {articulations for wheels B60G5/00; leaf spring attaching means B60G11/10, B60G11/12; trailing arm twist beam axle attaching means B60G21/052; articulations in general F16C}) · CPC title

• F16F1/3835

  characterised by the sleeve of elastic material, e.g. having indentations or made of materials of different hardness (F16F1/3807, F16F1/387 take precedence) · CPC title

• B60G2204/43

  Fittings, brackets or knuckles · CPC title

• B60G2204/148

  on the unsprung part of the vehicle, e.g. wheel knuckle or rigid axle · CPC title