Hydraulic damper spool valve

Abstract

A hydraulic damper assembly includes a main body, a main piston, a valve body, a valve sleeve, a valve spool and a resilient energy storage member. The valve body and the piston are disposed within the main body. The valve body defines a first chamber, a second chamber, and a cylindrical passage connecting the first chamber and the second chamber. The valve sleeve is moveably disposed in the cylindrical passage. The spool is moveably disposed within the bore of the valve sleeve. The resilient energy storage member may be disposed between the valve sleeve and valve spool. The resilient energy storage member is compressed as pressure is induced in one of the first chamber or the second chamber such that the valve sleeve and the spool move relative to one another so that at least a portion of a shaped aperture is exposed to the first chamber or second chamber to allow a proportional amount of hydraulic fluid to flow between the first chamber and the second chamber.

Description

technical field [0001] The invention relates to a valve for a hydraulic damper, in particular a valve for a hydraulic damper of a wheeled vehicle suspension. Background technique [0002] Hydraulic dampers used to control dynamic systems employ a piston adapted to be slidably carried within the cylinder body, and a circumferential seal against the cylinder wall. The piston is configured to be attachable to the shaft assembly. The piston divides the cylinder body into two parts (upper and lower) that are connected by restrictive passages that block the connection between the upper and lower parts of the cylinder body when the shaft assembly moves relative to the cylinder body. Fluid flow rate between lower sections. In this way, the operating characteristics of the damper are defined by the relationship between pressure and flow, which may be dictated by the geometry of the restrictive passage between the upper and lower portions of the cylinder body. [0003] If these res...

AI Technical Summary

Problems solved by technology

Another disadvantage of the compliant plate device is that due to the complex operating mechanism of the pressure-flow characteristic, it cannot be easily predicted using mathematical techniques

Another disadvantage of this construction is that the pressure-flow characteristic tends to lose its original shape over time as the compliant plate material fatigues and loses its hardness and strength as well as small particles from seal, piston and shaft wear curves, becomes restricted between these compliant boards

While piezoelectric materials based on Jones' variable orifice valves can overcome the tolerance limitations of passive dampers, the associated complexity and cost are limiting

Furthermore, the '745 patent does not describe a device in which the pressure-flow characteristics can be predicted simply mathematically

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