Specifications

63
www.milleruidpower.com
Heavy-Duty Hydraulic Cylinders
HV2 Series
Catalog HY08-M1140-3/NA
Miller Fluid Power
Des Plaines, IL
Milton, Ontario Canada
How to Use the Chart
The selection of a piston rod for thrust (push) conditions requires
the following steps:
1
. Determine the type of cylinder mounting style and rod end
connection to be used. Then consult the chart below and nd
the “stroke factor” that corresponds to the conditions used.
2
. Using this stroke factor, determine the “basic length” from the
equation:
The graph is prepared for standard rod extensions beyond
the face of the rod gland retainers. For rod extensions greater
than standard, add the increase to the stroke in arriving at the
“basic length.”
3
. Find the load imposed for the thrust application by multiplying
the full bore area of the cylinder by the system pressure.
4. Enter the graph along the values of “basic length” and “thrust”
as found above and note the point of intersection:
A) The correct piston rod size is read from the diagonally
curved line labeled “Rod Diameter” next above the point
of intersection.
B
) The required length of stop tube is read from the right of
the graph by following the shaded band in which the point
of intersection lies.
C
) If required length of stop tube is in the region labeled
“consult factory,” submit the following information for an
individual analysis:
1
) Cylinder mounting style.
2) Rod end connection and method of guiding load.
3) Bore, required stroke, length of rod extension
(Dim. “A” & “WF”) if greater than standard, and series
of cylinder used.
4
) Mounting position of cylinder. (Note: If at an angle or
vertical, specify direction of piston rod.)
5) Operating pressure of cylinder if limited to less than
standard pressure for cylinder selected.
Warning
Piston rods are not normally designed to absorb bending moments or
loads which are perpendicular to the axis of piston rod motion. These
additional loads can cause the piston rod end to fail. If these types of
additional loads are expected to be imposed on the piston rods, their
magnitude should be made known to our Engineering Department so
they may be properly addressed. Additionally, cylinder users should
always make sure that the piston rod is securely attached to the
machine member.
Recommended Mounting Styles for Rod End Stroke
Maximum Stroke and Thrust Loads Connection Case Factor
Groups 1 or 3
Long stroke cylinders for thrust loads should be mounted
using a heavy-duty mounting style at one end, rmly xed
and aligned to take the principal force. Additional mounting
should be specied at the opposite end, which should be
used for alignment and support. An intermediate support
may also be desirable for long stroke cylinders mounted
horizontally. See “Tie Rod Supports — Rigidity of
Envelope” for a guide. Machine mounting pads can be
adjustable for support mountings to achieve proper
alignment.
Group 2
Model 81 — Trunnion on Head
Models 87 & 89 — Intermediate Trunnion
Model 82 — Trunnion on Cap or Clevis on Cap
Fixed and Rigidly
Guided
Pivoted and Rigidly
Guided
Supported but not
Rigidly Guided
Pivoted and Rigidly
Guided
Pivoted and Rigidly
Guided
Pivoted and Rigidly
Guided
.50
.70
2.00
1.00
1.50
2.00
I
II
III
IV
V
VI
Basic
Length
Actual
Stroke
Stroke
Factor
= x
!
Piston Rod Selection Data