17
Product Specication and Operational Environment
Standard Specication
1
ISO 4301 specifies the total operating hour (service life) of gears and bearings according to the loading status. For
example, the total operating hour (service life) of the mechanism when it is constantly applied with the capacity is
1,600 hours for M5. The total operating hour is 6,300 hours when operated with a medium load.
* Rate of loading
Light : A case where the capacity is rarely applied. Usually the hoist is used with a light load.
Medium : A case where the capacity is applied considerably frequently. Usually the hoist is used with a medium
load.
Heavy : A case where the capacity is applied considerably frequently. Usually the hoist is used with a heavy load.
Ultra heavy : A case where the capacity is applied constantly.
Loading status*
Total operating hour h
800 1600 3200 6300
12500 25000
Light M4 M5 M6
Medium M4 M5 M6
Heavy M4 M5 M6
Ultra heavy M4 M5 M6
●
ISO
Hoist duty
class
Typical areas of application
Operation time ratings at K=0.65
Unlformly distributed
work periods
Infrequent
work periods
Max. on
time, min / hr
Max. No.
starts / hr
Max. on time from
cold start, min
Max. No.
of starts
H2
Light machine shop fabricating,
service,and maintenance; loads and
utilization randomly distributed; capacitys
infrequently handled.
7.6 (12.5%) 75 15 100
H3
General machine shop fabricating,
assembly, storage, and warehousing;
loads and utilization randomly distributed.
15 (25%) 150 30 200
H4
High volume handing in steel warehouses,
machine shops, fabricationg plants and
mills, and foundries; manual or automatic
cycling operations in heat treating
and plating; loads at or near capacity
frequently handled.
30 (50%) 300 30 300
●
ASME HST
• The grade symbols are identical to those of ASME HST-1M. (Performance standard for Electric Chain Hoist)
Relation between ISO-and FEM-Denominations
1 Dm 1 Cm 1 Bm 1 Am 2 m 3 m 4 m 5 m
M 1 M 2 M 3 M 4 M 5 M 6 M 7 M 8
Load
spectrum
Cubic
mean value
Class of operation time
V0.06 V0.02 V0.25 V0.5 V1 V2 V3 V4 V5
T0 T1 T2 T3 T4 T5 T6 T7 T8
Average operation time per day in hours
0.12 0.25 0.5 1 2 4 8 16
>
16
1 L1 K
0.50 – – 1 Dm 1 Cm 1 Bm 1 Am 2 m 3 m 4 m
2 L2 0.50<K
0.63 – 1 Dm 1 Cm 1 Bm 1 Am 2 m 3 m 4 m 5 m
3 L3 0.63<K
0.80 1 Dm 1 Cm 1 Bm 1 Am 2 m 3 m 4 m 5 m –
4 L4 0.80<K
1.00 1 Cm 1 Bm 1 Am 2 m 3 m 4 m 5 m – –
Class of
operating
time
Average
operating
time per day
(in hours)
Calculated
total operating
time
(in hours)
V0.06 T0 0.12 200
V0.12 T1
0.25 400
V0.25 T2
0.5 800
V0.5 T3
1 1,600
V1 T4
2 3,200
V2 T5
4 6,300
V3 T6
8 12,500
V4 T7
16 25,000
V5 T8 >16 50,000
●
FEM
• The grade symbols are identical to those of FEM 9.511.
(Rules for Design of Serial Lifting Equipment: Classification of Mechanisms)
(to be continued)
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