Frequency sensitive type shock absorber

Patent metadata

Field	Value
Publication number	US-10330169-B2
Application number	US-201815880048-A
Country	US
Kind code	B2
Filing date	Jan 25, 2018
Priority date	Feb 6, 2017
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

The present disclosure relates to a frequency sensitive type shock absorber configured to generate a soft damping force using one dividing disk to change the damping force on the basis of a traveling speed of a vehicle and a state of a road surface, improve ride comfort and steering stability, and decrease a manufacturing cost.

First claim

What is claimed is:

1. A frequency sensitive type shock absorber comprising:
a piston valve coupled to one end of a piston rod and configured to divide a cylinder filled with a fluid into a compression chamber and an extension chamber;
a connecting flow path formed in the piston rod and including an upper end in communication with the extension chamber; and
an auxiliary valve coupled to the piston valve,
wherein the auxiliary valve includes:
a housing coupled to a lower portion of the piston valve to connect the connecting flow path and an auxiliary chamber in the auxiliary valve and including an auxiliary flow path formed in a lower portion thereof and configured to vertically pass through the lower portion;
an upper washer and a lower washer respectively disposed at an upper portion and a lower portion of the auxiliary chamber and including through holes formed to vertically pass through the upper washer and the lower washer to be connected to the connecting flow path and the compression chamber, and first contact protrusions formed in a ring shape at edges of the through holes to protrude from corresponding surfaces;
an upper seal and a lower seal coupled to the corresponding surfaces of the upper washer and the lower washer, respectively, and including second contact protrusions formed in a ring shape around edges of the first contact protrusions to protrude more than the first contact protrusions; and
a dividing disk disposed to be spaced apart from and interposed between the upper washer and the lower washer and including an orifice hole formed to vertically pass through the dividing disk such that a fluid introduced into the auxiliary chamber flows vertically during a high frequency stroke, and one surface of the dividing disk bent to come into contact with the first contact protrusion and the second contact protrusion sequentially to close the orifice hole during a low frequency stroke.

2. The frequency sensitive type shock absorber of claim 1 , wherein the corresponding protruding surfaces of the first contact protrusions and the second contact protrusions are horizontally formed and form vertical steps having different heights.

3. The frequency sensitive type shock absorber of claim 2 , wherein first curved portions, which are convex in directions in which the first contact protrusions protrude, are formed along inner and outer diameter side edge portions of the first contact protrusions.

4. The frequency sensitive type shock absorber of claim 2 , wherein second curved portions, which are convex in directions in which the second contact protrusions protrude, are formed along inner and outer diameter side edge portions of the second contact protrusions.

5. The frequency sensitive type shock absorber of claim 1 , wherein:
support protrusions are formed along edges of corresponding surfaces of the upper seal and the lower seal to protrude from the corresponding surfaces;
the support protrusions are spaced apart from the second contact protrusions, have a diameter greater than that of the second contact protrusions, and support an edge of the dividing disk from above and below; and
the orifice hole is interposed between the second contact protrusions and the support protrusions.

6. The frequency sensitive type shock absorber of claim 5 , wherein corresponding surfaces of the support protrusions are formed to protrude more than the second contact protrusions such that the dividing disk is spaced apart from the second contact protrusions.

Assignees

• Mando Corp

Inventors

• Kim Nam Ho

Classifications

• B60G17/08

  Characteristics of fluid dampers (adjusting fluid dampers in general F16F9/44 - F16F9/53) · CPC title

• B60G2500/112

  Fluid actuation · CPC title

• F16F9/5126 Primary

  Piston, or piston-like valve elements (F16F9/504 takes precedence) · CPC title

• F16F9/34 Primary

  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

• B60G2400/91

  Frequency · CPC title