Electronically controlled internal damper

Patent metadata

Field	Value
Publication number	US-9732819-B2
Application number	US-201615009772-A
Country	US
Kind code	B2
Filing date	Jan 28, 2016
Priority date	Jan 29, 2015
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

An electronically controlled internal damper includes: a main passage formed by a working fluid flowing through a main piston; a pilot passage formed by a working fluid as much as a predetermined amount discharged from a first pilot chamber and a second pilot chamber so as to maintain internal pressures of the first pilot chamber and the second pilot chamber to a predetermined level when pressures of the first pilot chamber and the second pilot chamber are increased beyond the predetermined level; and a bypass passage formed by a working fluid passing through the compression retainer and the rebound retainer symmetrically disposed above and under the main piston and a plurality of holes formed transversely to a vertical length direction of a spool rod. Accordingly, the electronically controlled internal damper is capable of implementing damping performance in both a soft mode and a hard mode with a relatively simple structure and increasing sealing performance while reducing rigidity.

First claim

What is claimed is:

1. An electronically controlled internal damper comprising:
a main passage formed by a working fluid flowing through a main piston in which compression passages and rebound passages are alternately disposed;
a pilot passage formed by the working fluid as much as a predetermined amount discharged from a first pilot chamber and a second pilot chamber so as to maintain internal pressures of the first pilot chamber and the second pilot chamber to a predetermined level when pressures of the first pilot chamber and the second pilot chamber are increased beyond the predetermined level, the first pilot chamber being formed by a compression retainer disposed above the main piston and a first housing disposed above the compression retainer, and the second pilot chamber being formed by a rebound retainer disposed under the main piston and a second housing disposed under the rebound retainer; and
a bypass passage formed by the working fluid passing through the compression retainer and the rebound retainer symmetrically disposed above and under the main piston and a plurality of holes formed transversely to a vertical length direction of a spool rod, the bypass passage being formed by the working fluid flowing between a cylinder upper chamber and a cylinder lower chamber bypassing the first pilot chamber and the second pilot chamber,
wherein the spool rod penetrates in central portions of the main piston, the compression retainer, the rebound retainer, the first housing, and the second housing.

2. The electronically controlled internal damper according to claim 1 , wherein, during a rebound stroke, the main passage is formed by the working fluid that flows from an upper portion of the rebound passage of the main piston to a communication hole of the rebound retainer disposed on a bottom surface of the main piston and is discharged to the outside of the second housing through an upper space of the second housing disposed under the rebound retainer.

3. The electronically controlled internal damper according to claim 1 , wherein, during a compression stroke, the main passage is formed by the working fluid that flows from a lower portion of the compression passage of the main piston to a communication hole of the compression retainer disposed on a top surface of the main piston and is discharged to the outside of the first housing through a lower space of the first housing disposed above the compression retainer.

4. The electronically controlled internal damper according to claim 1 , wherein, during a rebound stroke, the bypass passage is formed by the working fluid that flows from an upper portion of the rebound passage of the main piston through a communication hole of the rebound retainer and passes through the spool rod across a reciprocating direction of a driven spool and is then discharged to the outside of the rebound retainer through the compression passage of the main piston and bypass a top surface of the rebound retainer.

5. The electronically controlled internal damper according to claim 1 , wherein, during a compression stroke, the bypass passage is formed by the working fluid that flows from a lower portion of the compression passage of the main piston through a communication hole of the compression retainer and passes through the spool rod across the reciprocating direction of the driven spool and is then discharged to the outside of the compression retainer through the rebound passage of the main piston and bypass a top surface of the compression retainer.

6. The electronically controlled internal damper according to claim 1 , wherein, during a rebound stroke, the pilot passage is formed by the working fluid that flows from an upper portion of the compression passage of the main piston through a communication hole of the rebound retainer and passes through the spool rod across the reciprocating direction of the driven spool and is then discharged to the bottom outside of the second housing through the second pilot chamber that is the inner space of the second housing.

7. The electronically controlled internal damper according to claim 1 , wherein, during a compression stroke, the pilot passage is formed by the working fluid that flows from a lower portion of the compression passage of the main piston through a communication hole of the compression retainer and passes through the spool rod across the reciprocating direction of the driven spool and is then discharged to the top outside of the first housing through the first pilot chamber that is the inner space of the first housing.

8. The electronically controlled internal damper according to claim 1 , further comprising:
a piston assembly including the main piston in which the compression passages and the rebound passages are alternately disposed, the compression retainer disposed on a top surface of the main piston and including a plurality of communication holes respectively communicating with the compression passages, and the rebound retainer disposed on a bottom surface of the main piston and including communication holes respectively communicating with the rebound passages, wherein the spool rod penetrates in central portions of the main piston, the compression retainer, and the rebound retainer; and
a housing assembly including a first housing and a second housing, wherein the first housing is disposed above the compression retainer, a bottom surface of the first housing is opened, an inner space of the first housing communicates with its top outside, the second housing is disposed under the rebound retainer, a top surface of the second housing is opened, and an inner space of the second housing communicates with its bottom outside.

9. The electronically controlled internal damper according to claim 8 , further comprising:
a first sealing member mounted on a top surface of the compression retainer and allowing a vertical reciprocation to some degree by pressure of the working fluid while abutting sealingly a lower inner peripheral surface of the first housing such that the inner space of the first housing becomes the first pilot chamber; and
a second sealing member mounted on a bottom surface of the rebound retainer and allowing a vertical reciprocation to some degree by pressure of the working fluid while abutting sealingly an upper inner peripheral surface of the second housing such that the inner space of the second housing becomes the second pilot chamber.

10. The electronically controlled internal damper according to claim 9 , wherein the first sealing member includes:
a first compression disk disposed between the compression retainer and the first housing; and
a first seal lip that is an elastic member connected to the first compression disk and contacting a lower inner peripheral surface of the first housing.

11. The electronically controlled internal damper according to claim 10 , wherein a connection between the first compression disk and the first seal lip is performed by inserting a first coupling protrusion formed in the first seal lip into a first coupling slot formed in the first compression disk and having a first tapered surface, and
the first tapered surface is gradually widened toward a bottom surface of the first sealing disk.

12. The electronically controlled internal damper according to claim 9 , wherein the second sealing member includes:
a second compression disk disposed between the rebound retainer and the second housing; and
a second seal lip that is an elastic member connected to the second compression disk and contacting an upper inner peripheral surface of the second housing.

13. The electronically controlled internal damper according to claim 12 , whe

Assignees

• Mando Corp

Inventors

• Kim Eun Joong

Classifications

• F16F9/16

  involving only straight-line movement of the effective parts {(wing closers or openers with liquid piston brakes E05F3/04)} · 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

• F16F9/464

  Control of valve bias or pre-stress, e.g. electromagnetically (F16F9/465 takes precedence) · CPC title

• F16F9/5123 Primary

  responsive to the static or steady-state load on the damper · CPC title

• F16F9/3415

  characterised by comprising plastics, elastomeric or porous elements · CPC title