Patent ID: 6772794
Filing Date: 2004-08-10
Classification: F15B

Abstract:
A reservoir for supplying hydraulic fluid to a hydraulic system to meet the needs thereof, comprising a body defining a variable volume chamber, a movable part in said variable volume chamber, a port for connecting said variable volume chamber to the hydraulic system, and a restrainer urging said variable volume chamber towards a collapsed position, said restrainer including a biasing member, and a traction rod extending from said movable part in a direction opposite to an expansion direction of said variable volume chamber, and wherein the biasing force of the biasing member is transmitted to the movable part by said traction rod, said biasing member being mounted in a tubular guide to prevent said biasing member from buckling, said tubular guide being in fluid flow communication with said variable volume chamber so that said biasing member is immersed in the hydraulic fluid, said biasing member including a spring mounted about said traction rod, said spring having a first end abutted against said outer surface of said body and a second end abutted against a stop provided at a free end portion of said traction rod opposite said movable part of said variable volume chamber, said spring pushing in said stop to urge said movable part to said collapsed position, the arrangement being such that when the variable volume chamber expands under the fluid pressure of the hydraulic fluid against a biasing force of the restrainer, a force of reaction in the restrainer equal and opposite to the biasing force is transmitted to an outer surface of the body in a direction opposite to the fluid pressure exerted by the hydraulic fluid on an inner surface of the body opposite said inner surface, thereby allowing the force of reaction in the restrainer to be counterbalanced by the fluid pressure in the variable volume chamber.