64
64
Fig6.1 Hydraulic pump
Fig6.1 Hydraulic pump
Fig6.2 Control valve
Fig6.2 Control valve
6.3.1 Relief valve and flow
6.3.1 Relief valve and flow divider (see Fig6.3)
divider (see Fig6.3)
The relief valve consists of main valve A and proceeding valve B. When the spool of
The relief valve consists of main valve A and proceeding valve B. When the spool of
the control valve is operated, chamber Q linked with the operating cylinder is filled with
the control valve is operated, chamber Q linked with the operating cylinder is filled with
high pressure oil. The high pressure oil
high pressure oil. The high pressure oil affects proceed
affects proceeding valve B through throttle
ing valve B through throttle hole D
hole D
and E. If the system pressure is higher than the setting pressure, the proceeding valve B
and E. If the system pressure is higher than the setting pressure, the proceeding valve B
will be opened to make the pressure in F chamber lower and thus causes the main valve
will be opened to make the pressure in F chamber lower and thus causes the main valve
A to
A to move ri
move right, then
ght, then the oi
the oil i
l in
n chamber Q
chamber Q may
may directly flow
directly flow to l
to low-pressure passage
ow-pressure passage G
G
and reduce chamber Q pressure. In this way, the system pressure may keep unvaried.
and reduce chamber Q pressure. In this way, the system pressure may keep unvaried.
The setting pressure may be adjusted by the adjusting screw H.
The setting pressure may be adjusted by the adjusting screw H.
The construction of the flow divider is quite simple. It is of direct overflow type, and
The construction of the flow divider is quite simple. It is of direct overflow type, and
ensures the constant pressure of the power steering system by
ensures the constant pressure of the power steering system by balancing the oil pressure
balancing the oil pressure
with fixed spring force. When turning, chamber M gets through with the high pressure
with fixed spring force. When turning, chamber M gets through with the high pressure
passage. If the oil pressure is higher than the spring force, the valve core N moves right,
passage. If the oil pressure is higher than the spring force, the valve core N moves right,
causing the high pressure oil to flow
causing the high pressure oil to flow directly to the low-pressure passage via. Chamber T
directly to the low-pressure passage via. Chamber T
and keeping the pressure of the power steering system unvaried. The setting pressure is
and keeping the pressure of the power steering system unvaried. The setting pressure is
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