IMPROVEMENT TO FREQUENCY DEPENDENT VALVES
A valve (1) comprises: a pressure chamber (300); a valve assembly (100) controlling a passage of fluid (150), the valve assembly (100) being configured in such a way that its preload force is controlled by the pressure chamber (300); a spring element (370) that helps the valve assembly (100) oppose change in volume of the pressure chamber (300), its preload force also controlled by the pressure chamber (300); characterized in that: for a given change in volume of the pressure chamber (300), reaction force from the spring element (370) changes faster than reaction force of the valve assembly (100).
The present disclosure relates to hydraulic shock absorbers and dampers which can be adapted for use in a suspension system such as the systems used for transportation vehicles. More particularly, the present disclosure relates to a frequency dependent shock absorber, to provide different damping characteristics when subjected to input of differing frequencies.
BACKGROUND OF THE INVENTION AND PRIOR ARTFrequency dependent valves such as those described in WO03040586, WO2015130544, WO2015030884, typically contain a pressure chamber, whose change in volume is related to change in preload force on a valve assembly which throttles a fluid stream. Typically, movement which results in increase in preload force of the valve assembly is mostly opposed by reaction force from the valve assembly itself, but this sometimes results in sharp changes in pressure drop during a damper's stroke which is undesirable.
SUMMARY OF THE INVENTIONThe present invention solves all the problems mentioned above as per the claims annexed to the present disclosure.
The accompanying drawings comprise:
- 1: Frequency dependent valve
- 10: Piston
- 11: Flow channel
- 30: Piston rod
- 100: Valve assembly
- 150: Fluid flow
- 300: Pressure chamber
- 301: Chamber wall
- 370: Spring element
- 380: Flow restrictor
- 390: Check valve
The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the disclosure, its applications, or uses. Whenever the same reference number occur on different drawings, the same reference number designates similar or corresponding parts throughout the different drawings.
- A valve (1) comprising:
- a pressure chamber (300);
- a valve assembly (100) controlling a passage of fluid (150), the valve assembly (100) being configured in such a way that its preload force is controlled by the pressure chamber (300);
- a spring element (370) that helps the valve assembly (100) oppose change in volume of the pressure chamber (300), its preload force also controlled by the pressure chamber (300);
- characterized in that:
- for a given change in volume of the pressure chamber (300), reaction force from the spring element (370) changes faster than reaction force of the valve assembly (100).
When the pressure chamber (300) expands, the chamber wall (301) deforms and/or moves towards the main valve assembly (100). As a result the main valve assembly (100) receives a preloading force from the pressure chamber (300), at the same time the main valve assembly (100) imparts a reaction force of the same magnitude to the pressure chamber (300), opposing its expansion.
It is advantageous, for an improved frequency dependency performance, to have a spring element (370), which can be tuned, to help return the pressure chamber (300) back to its resting volume more quickly than would be in the case without the helping element (370). The helping element (370) imparts an additional force opposing the change in volume of the pressure chamber (300), which does so without adding to the preload force on the valve assembly (100).
Structural representations of embodiments corresponding to the diagram of
- A valve (1) comprising:
- a pressure chamber (300);
- a valve assembly (100) controlling a passage of fluid (150), the valve assembly (100) being configured in such a way that its preload force is controlled by the pressure chamber (300);
- a spring element (370) that helps the valve assembly (100) oppose change in volume of the pressure chamber (300), its preload force also controlled by the pressure chamber (300);
- characterized in that:
- for a given change in volume of the pressure chamber (300), reaction force from the spring element (370) changes faster than reaction force of the valve assembly (100).
Furthermore, in
- said pressure chamber (300) comprises a moveable and/or deformable chamber wall (301),
- said spring element (370) is configured to oppose movement or deformation of said chamber wall (301) which results in increased preload of said valve assembly (100);
- said spring element (370) is higher in stiffness than said valve assembly (100).
While the present invention has been described with reference to the embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made as defined in the following claims.
Claims
1. A valve (1) comprises: characterized in that:
- a pressure chamber (300);
- a valve assembly (100) controlling a passage of fluid (150), said valve assembly (100) being configured in such a way that its preload force is controlled by said pressure chamber (300);
- a spring element (370) that helps said valve assembly (100) oppose change in volume of said pressure chamber (300), its preload force also controlled by said pressure chamber (300);
- for a given change in volume of said pressure chamber (300), reaction force from said spring element (370) changes faster than reaction force of said valve assembly (100);
- said spring element (370) and said valve assembly (100) are configured as springs operating mechanically in parallel with respect to said pressure chamber (300).
2. A valve (1) comprises: characterized in that:
- a pressure chamber (300);
- a valve assembly (100) controlling a passage of fluid (150), said valve assembly (100) being configured in such a way that its preload force is controlled by said pressure chamber (300) by receiving a preloading force from said pressure chamber (300), and at the same time said valve assembly (100) imparts an opposing reaction force of the same magnitude to said pressure chamber (300);
- said valve (1) also comprises a spring element (370) that helps said valve assembly (100) oppose change in volume of said pressure chamber (300) by imparting an additional force opposing change in volume of said pressure chamber (300), which does so without adding to the preload force on said valve assembly (100), its preload force also being controlled by said pressure chamber (300);
- for a given change in volume of said pressure chamber (300), reaction force from said spring element (370) changes faster than reaction force of said valve assembly (100).
3. A valve (1) according to claim 4,
- characterized in that: said pressure chamber (300) comprises a moveable and/or deformable chamber wall (301), said spring element (370) is configured to oppose movement or deformation of said chamber wall (301) which results in increased preload of said valve assembly (100).
4. A valve (1) according to claim 5, characterized in that:
- said spring element (370) is higher in stiffness than said valve assembly (100).
5. A valve (1) according to claim 1,
- characterized in that: said pressure chamber (300) comprises a moveable and/or deformable chamber wall (301), said spring element (370) is configured to oppose movement or deformation of said chamber wall (301) which results in increased preload of said valve assembly (100).
6. A valve (1) according to claim 2,
- characterized in that: said spring element (370) is higher in stiffness than said valve assembly (100).
Type: Application
Filed: Jan 3, 2017
Publication Date: Jan 3, 2019
Inventor: Shi YAN (Schilde)
Application Number: 16/067,609