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4-18
6. BRAKE ACCUMULATOR
6. BRAKE ACCUMULATOR
STRUCTURE
STRUCTURE
B
A
C
D
A Fluid portion
B Gas portion
C Diaphragm
D Valve disk
OPERATION
OPERATION
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.
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.
(1)
(1)
(2
(2)
(3)
3)
1)
1)
2)
2)
75794BS09
Item
31LL-40020
(item17)
81L1-0003
(item16)
Diameter
167 mm
138 mm
Mounting height
219 mm
187 mm
Norminal volume
2.0
ℓ
1.0
ℓ
Priming pressure
50 kgf/cm
2
50 kgf/cm
2
Operating medium
Oil
Oil
Operating pressure Max 210 kgf/cm
2
Max 200 kgf/cm
2
Thread
M22
×
1.5
M22
×
1.5
Priming gas
Nitrogen
Nitrogen
Summary of Contents for HL955
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