6. BRAKE ACCUMULATOR 6. BRAKE ACCUMULATOR 1) 1) STRUCTURE STRUCTURE B A C A Fluid portion B Gas portion C Diaphragm D Valve disk D 75794BS09 2) 2) OPERATION OPERATION (1) (1) Purpose Purpose Fluids are practically incompressible and are thus incapable of accumulating pressure energy. In hydropneumatic accumulators, the compressibility of a gas is utilized to accumulate fluid. The compressible medium used in the accumulators is nitrogen. In braking systems, the purpose of the accumulators is to store the energy supplied by the hydraulic pump. They are also used as an energy reserve when the pump is not working, as a compensator for any losses through leakage, and as oscillation dampers.
(2 (2) Operation Operation The accumulator consists of a fluid portion (A) and a gas portion (B) with a diaphragm (C) as a gas-tight dividing element. The fluid portion (A) is connected to the hydraulic circuit, causing the diaphragm accumulator to be filled and the gas volume to be compressed as the pressure rises. When the pressure falls, the compressed gas volume will expand, thus displacing the accumulated pressure fluid into the circuit. The diaphragm bottom contains a valve disk (D) which, if the diaphragm accumulator is completely empty, closes the hydraulic outlet, thus preventing damage to the diaphragm.
Installation requirements Installation requirements The accumulators can be fitted in the hydraulic circuit, directly on a component or in blocks on suitable consoles. They should be fitted in as cool a location as possible. Installation can be in any position. ( 3) 3) 4-18 Item 31LL-40020 (item17) 81L1-0003 (item16) Diameter 167 mm 138 mm Mounting height 219 mm 187 mm Norminal volume 2.0再 1.0再 Priming pressure 50 kgf/cm2 50 kgf/cm2 Operating medium Oil Oil Operating pressure Max 210 kgf/cm2 Max 200 kgf/cm2 Thread M22Ý1.5 M22Ý1.5 Priming gas Nitrogen Nitrogen