Magnetic liquid damping shock absorber

Patent metadata

Field	Value
Publication number	US-11365779-B2
Application number	US-202117507245-A
Country	US
Kind code	B2
Filing date	Oct 21, 2021
Priority date	Oct 22, 2020
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

A magnetic liquid damping shock absorber includes a housing, a thermal insulating material layer, a mass block and a magnetic liquid. The housing defines a sealed cavity, the sealed cavity has a first wall face and a second wall face opposite in a first direction and a circumferential wall face located between the first wall face and the second wall face in the first direction. The thermal insulating material layer is provided on an outer surface of the housing, on a wall face of the sealed cavity or in a housing wall of the housing. The mass block is located in the sealed cavity, and the mass block and the housing define a magnetic liquid cavity therebetween. The magnetic liquid is filled in the magnetic liquid cavity.

First claim

What is claimed is:

1. A magnetic liquid damping shock absorber, comprising:
a housing defining a sealed cavity, the sealed cavity having a first wall face and a second wall face opposite in a first direction and a circumferential wall face located between the first wall face and the second wall face in the first direction;
a thermal insulating material layer provided on an outer surface of the housing, on a wall face of the sealed cavity or in a housing wall of the housing;
a mass block located in the sealed cavity, the mass block and the housing defining a magnetic liquid cavity therebetween; and
a magnetic liquid filled in the magnetic liquid cavity,
wherein the mass block is a permanent magnet, and the magnetic liquid is absorbed on the permanent magnet;
wherein the permanent magnet comprises a coupling part and a plurality of permanent magnet units, the plurality of permanent magnet units are coaxial, and two adjacent permanent magnet units are coupled through the coupling part; and
wherein each of the plurality of permanent magnet units comprises a second body and a plurality of teeth, the plurality of teeth are provided on the second body and spaced apart in a circumferential direction of the second body, the plurality of teeth are coupled to a circumferential face of the second body, the second body is columnar, and a cross section of the second body is a rotationally symmetric shape.

2. The magnetic liquid damping shock absorber according to claim 1 , wherein the housing wall of the housing defines a thermal insulating cavity, the thermal insulating material layer is formed by a phase-change material, and the phase-change material is filled in the thermal insulating cavity.

3. The magnetic liquid damping shock absorber according to claim 1 , wherein the housing comprises a first body, a first end cap and a second end cap, the first body has a first opening and a second opening opposite in the first direction, the first end cap covers the first opening and is coupled to the first body, the second end cap covers the second opening and coupled to the first body; the first end cap is provided with a first thermal insulating cavity, the second end cap is provided with a second thermal insulating cavity, the housing wall of the housing is provided with a third thermal insulating cavity, the first thermal insulating cavity is filled with a first thermal insulating material to form a first thermal insulating material layer, the second thermal insulating cavity is filled with a second thermal insulating material to form a second thermal insulating material layer, and the third thermal insulating cavity is filled with a third thermal insulating material to form a third thermal insulating material layer.

4. The magnetic liquid damping shock absorber according to claim 1 , wherein the plurality of teeth of each of the plurality of permanent magnet units are provided on the second body at equal intervals in the circumferential direction of the second body.

5. The magnetic liquid damping shock absorber according to claim 1 , wherein the second body of each of the plurality of permanent magnet units is provided with one first through hole extending in its axial direction, a central axis of the first through hole coincides with a central axis of the second body; or
the second body of each of the plurality of permanent magnet units is provided with a plurality of first through holes extending in its axial direction, the plurality of first through holes are evenly arranged about the central axis of the second body in the circumferential direction of the second body.

6. The magnetic liquid damping shock absorber according to claim 1 , wherein a number of the plurality of teeth of each of the plurality of permanent magnet units is equal to each other, the plurality of teeth of each of the plurality of permanent magnet units are opposite in one-to-one correspondence in an axial direction of the permanent magnet.

7. The magnetic liquid damping shock absorber according to claim 1 , wherein the coupling part is cylindrical, the coupling part and the plurality of permanent magnet units are coaxial, the permanent magnet is provided with a second through hole, and the second through hole passes through the coupling part and the second body of each of the plurality of permanent magnet units in an axial direction of the permanent magnet, a central axis of the second through hole, the central axis of the coupling part, and the central axes of the second bodies coincide; or
the coupling part is cylindrical, the coupling part and the plurality of permanent magnet units are coaxial, the permanent magnet is provided with a plurality of second through holes, and the plurality of second through holes pass through the coupling part and the second body of each of the plurality of permanent magnet units in an axial direction of the permanent magnet, the plurality of second through holes are evenly arranged about the central axis of the second body in the circumferential direction of the second body.

8. The magnetic liquid damping shock absorber according to claim 1 , further comprising a permanent magnet ring provided on the circumferential wall face, wherein the permanent magnet is located at an inner side of the permanent magnet ring, the permanent magnet is cylindrical, the permanent magnet has a central through hole, an axial direction of the central through hole is the first direction, the permanent magnet ring is annular, an axial direction of the permanent magnet ring and an axial direction of permanent magnet are both along the first direction, each of the permanent magnet ring and the permanent magnet is radially magnetized, and magnetizing directions of the permanent magnet ring and the permanent magnet are opposite.

9. The magnetic liquid damping shock absorber according to claim 1 , wherein the mass block has a first end face and a second end face opposite in the first direction;
the first wall face is recessed in a direction away from the second wall face to form a conical face, and the first end face is opposite the conical face in the first direction; or
the second wall face is recessed in a direction away from the first wall face to form a conical face, and the second end face is opposite the conical face in the first direction; or
the first wall face is recessed in a direction away from the second wall face to form a first conical face, the second wall face is recessed in a direction away from the first wall face to form a second conical face, the first end face is opposite the first conical face in the first direction, and the second end face is opposite the second conical face in the first direction.

10. The magnetic liquid damping shock absorber according to claim 9 , wherein each of the circumferential wall face, the first wall face and the second wall face is provided with an uneven structure.

Assignees

• Univ Tsinghua

Inventors

• Li Decai
• Li Yanwen
• Ren Sijie

Classifications

• F16F2224/045

  magnetorheological · CPC title

• F16F2222/06

  Magnetic or electromagnetic · CPC title

• F16F2222/02

  temperature-related (F16F2228/002 takes precedence) · CPC title

• F16F15/03

  using {magnetic or} electromagnetic means (F16F9/53, {F16F15/005} take precedence) · CPC title

• F16F15/023

  using fluid means · CPC title