Magnetorheological fluid automobile bumper

Patent metadata

Field	Value
Publication number	US-12427941-B2
Application number	US-202318108894-A
Country	US
Kind code	B2
Filing date	Feb 13, 2023
Priority date	Mar 9, 2022
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

Disclosed is a magnetorheological fluid automobile bumper, and belongs to the field of automobile bumpers. The magnetorheological fluid automobile bumper comprises a rear bumper body, wherein two front bumper bodies are symmetrically hinged to the front side of the rear bumper body, the ends, close to each other, of the two front bumper bodies are in butt joint with each other, a connecting rod is jointly installed between the front bumper body and the rear bumper body, one end of the connecting rod is hinged to the front bumper body, and the other end of the connecting rod is slidably installed with the rear bumper body; and a plurality of magnetorheological fluid buffers are installed on the rear side of the rear bumper body.

First claim

What is claimed is:

1. A magnetorheological fluid automobile bumper, comprising a rear bumper body ( 2 ), wherein two front bumper bodies ( 1 ) are symmetrically hinged to a front side of the rear bumper body ( 2 ) that faces toward the two front bumper bodies ( 1 ), ends of the two front bumper bodies that are opposite to hinged ends of the two front bumper bodies ( 1 ) are joined together, a connecting rod ( 3 ) is jointly installed between one of the two front bumper bodies ( 1 ) and the rear bumper body ( 2 ), one end of the connecting rod ( 3 ) is hinged to the one of the two front bumper bodies ( 1 ), and an other end of the connecting rod ( 3 ) is slidably installed with the rear bumper body ( 2 ); and
a plurality of magnetorheological fluid buffers are installed on a rear side of the rear bumper body ( 2 ) that faces away from the two front bumper bodies ( 1 );
wherein the magnetorheological fluid buffer comprises an outer sleeve ( 7 ), a magnet ( 8 ) is installed on the outer side of the outer sleeve ( 7 ), a push rod ( 6 ) is slidably arranged at an end of the outer sleeve ( 7 ) closest to the rear bumper body, one end of the push rod ( 6 ) is installed with the rear bumper body ( 2 ), an inner sleeve ( 9 ) is movably arranged inside the outer sleeve ( 7 ), each of two ends of the inner sleeve ( 9 ) is slidably provided with one of two extrusion blocks ( 10 ), the two extrusion blocks ( 10 ) are symmetrically arranged at the two ends of the inner sleeve ( 9 ), sides of the extrusion blocks that face away from each other are provided with push blocks ( 11 ), an other end of the push rod ( 6 ) located away from the rear bumper body ( 2 ), extends into the outer sleeve ( 7 ) and is installed with one of the push blocks ( 11 ), the inner wall of the outer sleeve ( 7 ) at an other end of the outer sleeve farthest from the rear bumper body is provided with second springs ( 12 ), the second springs ( 12 ) are installed with an other one of the push blocks ( 11 ), the inner sleeve ( 9 ) is filled with a magnetorheological fluid, fluid outlets are formed in the inner sleeve ( 9 ), buffer blocks ( 13 ) are slidably arranged in the fluid outlets, respectively, a third spring ( 14 ) is arranged in the inner sleeve ( 9 ), the buffer blocks ( 13 ) are installed with the third spring ( 14 ), and the buffer blocks ( 13 ) are in frictional contact with the inner wall of the outer sleeve ( 7 ).

2. The magnetorheological fluid automobile bumper according to claim 1 , wherein a sliding chute is formed in the side, close to the front bumper bodies ( 1 ), of the rear bumper body ( 2 ), a sliding seat ( 4 ) is slidably arranged in the sliding chute, the other end, away from the front bumper bodies ( 1 ), of the connecting rod ( 3 ) is hinged with the sliding seat ( 4 ), a first spring ( 5 ) is installed in the sliding chute, one end of the first spring ( 5 ) is connected with the sliding seat ( 4 ), and an other end of the first spring ( 5 ) is fixed with a tail end of the sliding chute that is opposite to the one end of the first spring ( 5 ) connected with the sliding seat ( 4 ).

3. The magnetorheological fluid automobile bumper according to claim 2 , wherein each one of the two extrusion blocks ( 10 ) is of a T-shaped structure, one end of each one of the two the extrusion blocks ( 10 ) is slidably arranged inside the inner sleeve ( 9 ), and an other end of each one of the two the extrusion blocks ( 10 ) is fixed with a corresponding one of the push blocks ( 11 ), and the end, positioned inside the inner sleeve ( 9 ), of the extrusion block ( 10 ) is provided with a sealing strip.

4. The magnetorheological fluid automobile bumper according to claim 3 , wherein two fluid outlets of the fluid outlets are symmetrically formed in the inner sleeve ( 9 ), a sealing strip is arranged between each of the buffer blocks ( 13 ) and a corresponding one of the fluid outlets, and two ends of the third spring ( 14 ) are fixedly installed with the two buffer blocks ( 13 ), respectively.

5. The magnetorheological fluid automobile bumper according to claim 4 , wherein an end of each of the buffer blocks ( 13 ) that is facing the inner wall of the outer sleeve is provided with anti-skid convex teeth, and the anti-skid convex teeth are in frictional contact with the inner wall of the outer sleeve ( 7 ).

6. The magnetorheological fluid automobile bumper according to claim 5 , wherein anti-skid concave ring grooves matched with the anti-skid convex teeth are formed in the inner wall of the outer sleeve ( 7 ).

7. The magnetorheological fluid automobile bumper according to claim 6 , wherein each of the two front bumper bodies ( 1 ) are hinged with a corresponding one of longitudinal ends of the rear bumper body ( 2 ) through a hinged seat, and the one end, close to the front bumper bodies ( 1 ), of the connecting rod ( 3 ) is hinged with a side of each one of the front bumper bodies that faces toward the rear bumper body.

8. The magnetorheological fluid automobile bumper according to claim 7 , wherein the two front bumper bodies ( 1 ) jointly form an arc-shaped bar.

Assignees

• Univ Zhejiang Normal

Inventors

• Wang Zhishen
• He Xinsheng
• Zhou Chongqiu
• Gao Chunfu
• Ye Fengchao

Classifications

• B60R19/32

  Fluid shock absorbers {, e.g. with coaxial coil springs} · CPC title

• F16F9/535

  Magnetorheological [MR] fluid dampers (springs comprising magnetorheological [MR] elastomers F16F1/361) · CPC title

• F16F9/103

  Devices with one or more members moving linearly to and fro in chambers, any throttling effect being immaterial, i.e. damping by viscous shear effect only (F16F9/53 takes precedence) · CPC title

• F16F2230/42

  Multiple pistons · CPC title

• F16F9/185

  Bitubular units (where compression of gas leads to a clear spring action F16F9/062) · CPC title