Hydraulic damper assembly including a hydraulic compression stop

Patent metadata

Field	Value
Publication number	US-11668367-B2
Application number	US-202117333011-A
Country	US
Kind code	B2
Filing date	May 28, 2021
Priority date	Jun 24, 2020
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

A hydraulic damper assembly comprises a main tube defining a fluid chamber. An external tube extends about the main tube defining a compensation chamber between the main and external tubes. A main piston, located in the main tube, divides the fluid chamber into a compression chamber and a rebound chamber. A piston rod couples to the main piston. A base valve, located in the compression chamber, couples to the main tube. A hydraulic compression stop, located in the compression chamber, includes an additional piston, an insert, and a fixing member. The additional piston couples to the main piston. The insert, located in the compression chamber, couples to the base valve. The insert has a main section and a terminal section. The terminal section having an external diameter that is less than an external diameter of the main section.

First claim

What is claimed is:

1. A hydraulic damper assembly comprising:
a main tube extending along a center axis defining a fluid chamber for containing a working fluid;
an external tube extending about said main tube defining a compensation chamber extending between said main tube and said external tube;
a main piston located in said main tube dividing said fluid chamber into a compression chamber and a rebound chamber;
a piston rod extending into said main tube and coupled to said main piston for moving said main piston between a compression stroke and a rebound stroke;
a base valve located in said compression chamber and coupled to said main tube for controlling working fluid flow between said compression chamber and said compensation chamber; and
a hydraulic compression stop located in said compression chamber for providing an additional damping force during said compression stroke;
said hydraulic compression stop including an additional piston and an insert, said additional piston being coupled to said main piston for movement with said main piston between said compression stroke and said rebound stroke, said insert located in said compression chamber and being coupled to said base valve;
said insert having a main section and a terminal section, said terminal section being located adjacent to a fixing member and said main section being in fluid communication with said terminal section, said terminal section having an external diameter that is less than an external diameter of said main section,
wherein said hydraulic compression stop includes the fixing member, said fixing member located between said main tube and said base valve for coupling said base valve to said main tube; and
wherein said insert couples to said fixing member via a press-fit engagement,
wherein said fixing member includes a head portion extending outwardly from said fixing member and along said center axis toward said main piston,
said terminal section of said insert includes an internal flange extending radially inwardly toward said center axis, said internal flange defining a mounting opening for receiving said head portion to establish said press-fit engagement,
wherein a height of said internal flange is greater than a height of said head portion, a ratio of said height of said internal flange to said height of said head portion is less than 2.

2. The hydraulic damper assembly according to claim 1 , wherein said insert and said fixing member are made from metal.

3. The hydraulic damper assembly according to claim 1 , wherein said mounting opening has a diameter smaller than a diameter of said head portion, a difference between said diameter of said mounting opening and said diameter of said head portion ranges from 0.01 to 0.5 mm.

4. The hydraulic damper assembly according to claim 1 , wherein said head portion has a tensile strength (Rm) greater than or equal to 300 Mpa, a yield stress (Re) greater than or equal to 250 Mpa, and hardness of at least 51 HRB in Rockwell B scale.

5. The hydraulic damper assembly according to claim 1 , wherein a diameter of said mounting opening satisfies the following:
Df ≤√{square root over ( Dv 2 −0.05*[( a*Dm ) 2 −( b*Dv ) 2 ])}

wherein Df is said diameter of said mounting opening;
Dv is an internal diameter of said insert;
Dm is said external diameter of said main section of said insert;
a=1.1 to 1.6; and
b=1.0 to 1.5, wherein b*Dv<a*Dm.

6. The hydraulic damper assembly according to claim 1 , wherein a diameter of said mounting opening satisfies the following:
Df ≥√{square root over ( Dd 2 −[( a*Dm ) 2 −( b*Dv ) 2 ])}

wherein Df is said diameter of said mounting opening;
Dd is said external diameter of said terminal section;
Dm is said external diameter of said main section of said insert;
Dv is an internal diameter of said insert;
a=1.1 to 1.6; and
b=1.0 to 1.5, wherein b*Dv<a*Dm.

7. The hydraulic damper assembly according to claim 1 , an internal diameter of said insert satisfies the following:

Dv
≤

Dd
2

-

0,4
*

a
2

*

Dm
2

1
-

0.4
*

b
2

wherein Dv is said internal diameter of said insert;
Dd is said external diameter of said terminal section;
Dm is said external diameter of said main section of said insert;
a=1.1 to 1.6; and
b=1.0 to 1.5, wherein b*Dv<a*Dm.

8. The hydraulic damper assembly according to claim 1 , wherein said insert defines a plurality of grooves, circumferentially spaced from one another, extending toward said base valve; and
wherein a length of said terminal section of said insert satisfies the following:

Ld
≤

Dd
2

-

0.4
*

[

(

a
*
Dm

)

2

-

(

b
*
Dv

)

2

]

-
Dv

2
*
tg
⁢
α

+
L
-
Lg

wherein L is a length of said insert;
Lg is a length of a longest groove of said plurality of grooves;
α is an inclination angle of a bottom central line of a groove of said plurality of grooves;
Dv is an internal diameter of said insert;
Dm is said external diameter

Assignees

• Beijingwest Ind Co Ltd

Inventors

• Kasprzyk Dominik Jaroslaw
• Ryndak Waldemar Jaroslaw

Classifications

• F16F9/185

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

• F16F9/49 Primary

  Stops limiting fluid passage, e.g. hydraulic stops {or elastomeric elements inside the cylinder which contribute to changes in fluid damping (fluid-actuated displacement devices with means for accelerating or decelerating the stroke F15B15/22)} · CPC title

• F16F9/3271

  Assembly or repair · CPC title

• F16F2222/10

  Adhesion · CPC title

• F16F9/34

  Special valve constructions ({F16F9/44, F16F9/50 take precedence; filtering details F16F9/3285} ; valves in general F16K); Shape or construction of throttling passages · CPC title