Damping force controlling shock absorber

Patent metadata

Field	Value
Publication number	US-10036444-B2
Application number	US-201514738683-A
Country	US
Kind code	B2
Filing date	Jun 12, 2015
Priority date	Jun 12, 2014
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A damping force controlling shock absorber can generate a hard damping force through disk slits during a low speed operation by adding a disk valve to a chamber, can constantly maintain a pressure of a back pressure compartment by opening a disk valve and discharge the pressure of the back pressure compartment to the outside when the pressure of the back pressure compartment is at a predetermined level or more, thereby generating a harder damping force during a low speed operation, and can adjust a disk valve open pressure during a medium/high speed operation so as to prevent the durability of the equipment from being lowered by an excessive increase of a pressure and prevent an abnormal operation from occurring.

First claim

What is claimed is:

1. A damping force controlling shock absorber, which includes a piston rod configured to perform compression and rebound strokes within a cylinder, a piston connected to a lower end of the piston rod to divide the cylinder into a compression chamber and a rebound chamber, a main passage passing through the piston in a vertical direction, and a solenoid connected to the piston rod and the piston to elevate a spool by a magnetic force, the damping force controlling shock absorber comprising:
a spool guide configured to guide the spool in a state of surrounding the outer periphery of the spool and having a plurality of hard passages and a plurality of soft passages at upper and lower portions of the spool guide, the plurality of hard passages and the plurality of soft passages connected by movement of the spool;
a main valve installed in a stroke direction of the piston and connected to the plurality of soft passages to generate a damping force when the plurality of soft passages are opened;
a back pressure chamber connected in a stroke direction of the main valve and connected to the main passage and the plurality of hard passages to generate a damping force when the plurality of hard passages are opened;
an outlet port formed in a stroke direction of the back pressure chamber to connect a back pressure compartment of the back pressure chamber to the compression chamber and the rebound chamber; and
a discharge valve installed in a state of blocking the outlet port from a direction of the compression chamber and the rebound chamber and configured to be opened when a pressure of the back pressure compartment exceeds a set level,
wherein when the spool moves downward away from the piston rod during the rebound stroke, the plurality of hard passages and the plurality of soft passages communicate with each other through a groove formed on an outer surface of the spool,
wherein when the spool moves upward toward the piston rod during the compression stroke, the communication between the plurality of hard passages and the plurality of soft passages is blocked,
wherein the main valve comprises:
a retainer installed in a stroke direction of the piston;
a first main disk disposed on an upper portion of the retainer at a lower end of the back pressure chamber; and
a second main disk disposed above the first main disk at the lower end of the back pressure chamber and having one or more slits in an edge portion thereof, and
wherein the discharge valve comprises:
a first discharge disk disposed at an upper end of the back pressure chamber in a state of blocking the outlet port from a direction of the compression chamber and the rebound direction;
a second discharge disk configured to support the first discharge disk in a direction of the back pressure chamber, and
wherein the upper end of the back pressure chamber is another end of the back pressure chamber toward the piston rod and the lower end of the back pressure chamber is one end of the back pressure chamber.

2. The damping force controlling shock absorber according to claim 1 ,
wherein the retainer has a first passage in a central portion so as to be connected to the main passage, and a second passage formed in an edge portion so as to be connected to the back pressure compartment of the back pressure chamber,
the first main disk is in a close contact with a central portion of the retainer to generate a damping force to the first passage, and
the second main disk is in a close contact with an edge portion of the retainer to generate a damping force to the second passage.

3. The damping force controlling shock absorber according to claim 2 ,
wherein the one or more slits allow a fluid transferred from the back pressure compartment to move through the second passage to the rebound chamber.

4. The damping force controlling shock absorber according to claim 2 , wherein the plurality of hard passages are formed at a position of the retainer and the back pressure chamber and configured to connect the first passage, a hollow of the spool guide, and the back pressure compartment when opened, and
the plurality of soft passages are formed in the spool guide to communicate with the plurality of hard passages and configured to connect the first passage and the main passage when opened.

5. The damping force controlling shock absorber according to claim 1 ,
wherein an edge portion of the first discharge disk is opened when the pressure of the back pressure compartment exceeds a set level, and
the second discharge disk brings the first discharge disk into close contact with the back pressure chamber.

6. The damping force controlling shock absorber according to claim 1 , wherein each of the discharge valve, the main valve, the back pressure chamber, the back pressure compartment, and the outlet port are provided in plural.

7. The damping force controlling shock absorber according to claim 3 , wherein the fluid, which moves to the back pressure compartment through the plurality of hard passages, moves to the compression chamber or the rebound chamber through the one or more slits and the second passage.

Assignees

• Mando Corp

Inventors

• Kim Eun Joong

Classifications

• F16F9/466

  Throttling control, i.e. regulation of flow passage geometry (F16F9/464, F16F9/465 take precedence) · CPC title

• F16F9/465

  using servo control, the servo pressure being created by the flow of damping fluid, e.g. controlling pressure in a chamber downstream of a pilot passage (self-adjustment of damping F16F9/50) · CPC title

• F16F9/3488 Primary

  characterised by features intended to affect valve bias or pre-stress · CPC title