Damping force control valve and shock absorber using the same
US7770983B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 20, 2007 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Mar 2, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/465
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A damping force control valve, which includes a high pressure region in communication with a tension chamber of a cylinder and a low pressure region in communication with a reservoir chamber, and controls a damping force by adjusting pressure of a pilot chamber by first and second variable orifices, the first and second variable orifices having channels controlled to open or close by a spool. The damping force control valve comprises a main valve opened or closed according to pressure of the high pressure region, initial preload and pressure of the pilot chamber, the main valve allowing working fluid to flow from the high pressure region to the low pressure region when being opened; a first fixed orifice formed between the high pressure region and the first variable orifice; and a back pressure forming channel for making the first fixed orifice and the pilot chamber communicate with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.