Hitachi DC 120VA, Технические данные и руководство по обслуживанию

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4-1-3. High slip torque mechanism for powerful drilling
The table below shows the factory test results on slip-mechanism life cycles. The Model DC 120VA is superior to
the Model DC 120V and C.
Test conditions: Repeated cycle of 2 seconds slip and 13 seconds rest.
40
30
20
10
0
0 1000 2000 3000 4000 5000 6000
(34 N
•
m)
(27 N
•
m)
(18 N
•
m)
(22 N
•
m)
(16 N
•
m)
(Test conditions)
•
Repeated cycle of 2 seconds slip and 13 seconds rest.
(Hitachi) DC 120VA
(Hitachi) DC 120V
C
Slip torque (N
•
m)
Slip life (cycles)
<Slip clutch mechanism>
DC 120VA: A claw clutch, which is the same as that of the Model DC 120V, is provided to increase the
service life.
C: A friction-plate clutch with a belleville spring, which is the same as that of 6300T, is provided.
4-1-4. Synchronized gear shift mechanism for easy speed switching
A synchronized gear shift mechanism is provided to permit automatic shifting between the low- and high-speed
ranges just by turning the shift lever. This eliminates the need to turn the drill chuck by hand while making the
changeover.
Model
Hitachi DC 120VA
Hitachi DC 120V
C
Slip torque after testing
2.2 kgf-m after 5000 cycles
1.6 kgf-m after 5000 cycles
0.8 kgf-m after 500 cycles
Influence on operation
No problem
No problem but slipped frequently
Drilling impossible
Model
Hitachi DC 120VA
Hitachi DC 120V
C
Synchronized gear shift mechanism
Provided
2-speed transmission is not provided
Not provided