Huvema CRDM 3050 x 16/1, Operation Manual

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8. Hydraulic system of machine
Hydraulic system of machine consists of control organ and clamp organ.
8.1 Control organ of hydraulic system (Figure 8.2)
Control valve and preelection valve are installed at the top of headstock.
Spindle speed preelection valve and feed preelection valve are six-way turning
valve of 16-bit, each valve controls four differential motion oil cylinder to realize
16-step speed change. Control valve is 5-bit and six-way turning valve, which
controls clockwise oil cylinder, counter-clockwise oil cylinder, speed oil cylinder,
neutral oil cylinder, brake oil cylinder.
Every position of control valve, oil way state as following
：
Action No.
1 2 3 4 5 6
clockwise + - - - + -
counterclockwise - + - - + -
Speed change + + + - + -
neutral - - - + + -
stop - - - - - -
remark
：
“+”: high pressure oil
，
“—”: low pressure oil
connection of every oil way
：
1
．
Clockwise oil cylinder 4
．
Neutral oil cylinder
2
．
Counterclockwise oil cylinder 5
．
Oil pump outlet
3
．
Preelection valve 6
．
scavenge oil mouth
High pressure oil enters preelection valve to push every speed change oil
cylinder, which drives shifting gear to change speed; High pressure oil enters
clockwise oil cylinder through eyelet during the speed change simultaneously;
because the oil cylinder's area is different (clockwise cylinder's area is bigger
than counter-clockwise cylinder's area),which causes the shifting fork push the
friction disk to push clockwise friction disk a little force, then the transmission
chain can be started.
When the control valve is in stop position, oil way
⑤
directly scavenge oil
way
⑥
,the whole system is in low-pressure state, at this time, the spring will be