TIC QUANTUM
Hydraulics
10/04 11-13
Downstroking of the LS pump is performed under the following
conditions:
•
a control unit is set to the neutral position. No volume flow is
required.
•
an additional control unit is set to the fine control range. A smaller
volume flow is required.
•
in parallel operation, a control unit is actuated to the neutral
position or to the fine control range. A smaller volume flow is
required.
The pump must perform a downstroke whenever a smaller volume flow is
needed.
This will always happen when the pressure on the right face end of the
volume flow controller (8) is higher than on the left face (in the spring
space).
In this case, the volume flow controller (8) is moved to the left against the
compression spring (21), opening the control edge (25).
This results in a rising pressure on the top face of the control ram (14) that
sets the swash plate (17) to a more vertical position against the control
spring (15) – the volume flow is reduced.
When the spool cross-section is reduced (fine control range), the load
pressure at the input (7) drops.
This changes the force ratio at the volume flow controller (8) so that the
volume flow controller is actuated to the left against the spring, according
to the pressure drop.
The control edge (25) is opened, thus pressurizing the control ram (14).
The swash plate (17) is set to a more horizontal position and the pump
performs a downstroke until the volume flow requirement is met.
A pump downstroke is triggered not only by the change of load pressure
(signal).
An example:
When operating two control units in parallel, the load pressure values are
140 bar and 100 bar.
The pump pressure adjusts to a load pressure of 140 bar + spring
pressure (spring 21).
Both the volume flow controller (8) and the swash plate (17) are in a
constant position. The pump delivers the volume flow required for both
consumers.
When the second control unit (load pressure 100 bar) is now set to the
neutral position, the volume flow must decrease since only the first
hydraulic circuit needs to be supplied.
This is achieved by disconnecting a hydraulic circuit, leading to a short-
time increase of the pump pressure. The volume flow controller (8) is now
actuated to the left, the control edge (25) opens and the pressure on the
top face of the control ram rises. The swash plate (17) is set to a more
horizontal position, thus reducing the volume flow.
Summary of Contents for QUANTUM 2500 K
Page 1: ...QUANTUM 3500 6800 Technical Systems QUANTUM 6800 P ...
Page 2: ...Technical Systems QUANTUM TIC 10 04 ...
Page 4: ...Technical Systems QUANTUM TIC 10 04 ...
Page 14: ...Technical Data QUANTUM TIC 1 10 10 04 ...
Page 21: ...TIC QUANTUM Operation 10 04 3 7 ...
Page 41: ...TIC QUANTUM Brakes 10 04 10 3 5500P S 16 40 km h 16 to Steering axle ...
Page 43: ...TIC QUANTUM Brakes 10 04 10 5 2500K P 3500P S K 3800K P 4500S P 40 km h steering axle ...
Page 45: ...TIC QUANTUM Brakes 10 04 10 7 5500P S 40 km h 13 to steering axle ...
Page 47: ...TIC QUANTUM Brakes 10 04 10 9 5500 P 18 S 18 60 km h ...
Page 49: ...TIC QUANTUM Brakes 10 04 10 11 5500P S 80 km h ABS ...
Page 57: ...TIC QUANTUM Brakes 10 04 10 19 5500 P S 50 60 km h ...
Page 59: ...TIC QUANTUM Brakes 10 04 10 21 5500 S 40 60 km h ...
Page 66: ...Brakes QUANTUM TIC 10 28 10 04 ...
Page 69: ...TIC QUANTUM Hydraulics 10 04 11 3 ...
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Page 170: ...Hydraulics QUANTUM TIC 11 104 10 04 ...
Page 173: ...TIC QUANTUM Electric System 10 04 12 3 3500K 3800K 2500K ...
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