1. home and garden

Helical, hydraulic
rotary actuators
L20 SERIES
Exceptional Performance in a Cost-Effective Package
An innovation rotary actuator design, the L20 Series utilizes Helac Coropration’s sliding spline technology to combine
device, mounting
bracket, and
The
Series ability,
is a cost-effective
solution
thatcompact
can easilyconfigurations,
loadL20
carrying
high torque
output,
shock resistance
andload
zerobearing
leakagestructure
in a cost-effective
the
L20
Series
eliminates
the
need
for
external
bearing
be
desgined
into
a
wide
range
of
applications.
It
features
package. L20 Series is available in three sizes with torque output to 15,000 in-lb at 3,000 psi (1,690 Nm
at 210 bar).
systems, brakes or locking devices. Five standard
versatile mounting options and flange output. Helac’s
sizes with torque output up to 39,000 in-lb at 3,000 psi
helical, sliding spline technology is non self locking while
(4,400 Nm at 210 bar).
providing high shock resistance and high holding-torque
for demanding applications. Functioning as a rotating
Powerful
Durable
• High Torque
• High Bearing Capacity
• Suitable for Harsh Environments
• Moving Parts Enclosed
Drift Free
Positioning
Streamlined
Design
• Zero Internal Leakage
• Smooth Operation
• No External Brake Required
• Eliminates Linkages and Bearings
• Reduced Bill of Materials
Backdrives
in Overload
Conditions
• Hydraulic Fuse
• Prevents Mechanical Damage
2
Ultra
Compact
• High Power Density
• Fits in Tight Spaces
Integral Counterbalance Valves
Choose our optional factory mounted counterbalance valves to provide controlled backdriving and smooth rotation when over center
conditions exist.
The valves are set to open at 1000 psi
(70 bar) and to relieve at 3300 psi ±300
psi (230.7 bar ±20.7 bar). The valves are
set at the factory and cannot be adjusted.
Machined from aluminum, the valve
blocks are bolted to a flat mounting pad
milled on the actuator housing. Three
bolts secure the valve block to the actuator. See specification pages for
valve location.
Clevis Mounting
Custom housing clevis mounting is
available. See the photo on Page 7
for examples of both platform and
jib rotation applications.
Cantilever and Straddle Mounting
Cantilever Mounting
Straddle Mounting
The load is bolt mounted to the torque flange and only
supported at one end of the shaft. Cantilever mounting is
never recommended for aerial work platforms, or other
critical and safety-related applications.
The load is supported at both ends of the shaft. The upper
portion of the bracket is bolted to the torque flange, whereas
the lower portion is secured by a tie rod passed through the
shaft bore.
3
Foot Mounted Models: 180° Rotation
A1
►
►
K2
A2
►
A2
►
►
►
►
J2, J3
►
►
►
►
►
►
PORT V2
PORT V1
J1
►
H4
►
►
H1
H2, H3
►
K1
D1
►
►
►
►
►
►
E2
C
►
E3 ►
PORT P1 PORT P2
L20-25, 39 Endcap
►
►
L20-25, 39 Flange End
B1
►
►
►
►
►
B2
AT
ROT ION
ATION
ROT
►
►
PORT P1
PORT P2
E1
►
►
►
J4
►
►
►
D2
►
E4
L20-4.5, 8.2, 15 Flange End
L20-4.5, 8.2, 15 Endcap
Specifications
4.58.2152539
Torque
Drive Torquein-lb @ 3,000 psi
Nm @ 210 bar
4,500
508
8,200
930
15,000
1,690
25,000
2,940
39,000
4,400
Holding Torquein-lb @ 3,000 psi
11,800
21,100
38,720
62,900
93,200
Nm @ 210 bar1,3002,4004,4007,10011,000
Maxium Moment Capacity
in-lb
22,500
40,000
90,000
145,000
280,000
Straddle Moment
Nm 2,500 4,50010,20016,40031,600
Cantilever Moment
in-lb
12,000
22,000
48,000
100,000
140,000
Nm1,3602,4855,54011,00016,000
Maxium Force Capacity
lb
3,050
4,700
9,230
12,300
21,100
Radial Force
kg1,3802,1604,1905,5809,570
Axial (Thrust) Force
lb
1,100
1,500
2,200
3,100
3,900
kg 500 6801,0001,4101,770
Displacement
in3
8.05
14.30
26.60
44.30
65.70
cm3132234435725
1,076
Approximate Weight (Wet)
lb
28.00
38.00
67.00
115.00
171.00
With Counterbalance Valve
kg12.7017.2030.4052.2077.60
Without Counterbalance Valve
lb
26.50
36.50
65.50
113.00
169.00
kg12.0016.6029.7051.3076.70
4
Dimensions
4.58.2152539
A1 Nominal housing diameter
in
3.98
4.48
5.48
6.50
7.50
mm101114139165191
A2 Shaft and endcap flange diameter
in
4.10
4.60
5.60
6.70
7.70
mm104117142170196
B1 Length overall, rotating
in 7.40
8.50
9.75
11.75
13.25
mm188216248298337
B2 Length, non-rotating
in 6.80
7.76
9.01
10.87
12.37
mm173197229276314
C Width overall
in 7.00
7.50
9.80
11.00
13.00
mm178191248279330
D1 Height to centerline
in 2.60
3.00
3.38
4.25
4.75
mm667686108121
D2 Height overall, without valve
in 4.73
5.35
6.23
7.68
8.67
mm120136158195220
E1 Mounting length
in 4.38
5.50
6.00
7.25
8.50
mm111140
152.4184216
E2 Mounting width
in 5.50
6.00
7.75
8.75
10.50
mm145
152.4197222267
E3 Foot location
in 1.49
1.48
1.85
2.25
2.38
mm3838475760
E4 Nominal diameter, mounting hole
in 5/8
3/4
1
1
1 1/4
mmM16M20M24M24M30
H1 Bolt circle diameter,
in
2.125
2.630
3.375
4.000
4.750
shaft flange
mm546585102121
H2 Mounting holes,
inch
3/8-16
3/8-16
1/2-13
3/4-10
3/4-10
shaft flange
deep0.530.530.751.131.13
metricM10x1.5M10x1.5M12x1.75M20x2.5M20x2.5
deep1315193028
H3 Number of holes, shaft flange
6
8
8
8
10
H4 Shaft center hole
inch
-
-
-
1-8
1 1/4-7
deep---
2.00
2.00
metric---
M24x3.0
M30-3.5
deep---
25
50
J1 Bolt circle diameter,
in
-
-
-
4.25
4.75
endcap flange
mm---
108
121
J2 Mounting holes of endcap
inch
-
-
-
1/2-13
5/8-11
flange (S2)
deep---
0.75
0.94
metric---
M12x1.75
M16x2
deep---
18
23
J3 Number of holes, endcap flange (S2)
-
-
-
8
10
J4 Nominal thru hole diameter (S1)
inch
3/4
1
1
-
-
deep
-
through
through
-
metric
M20
M24
M24
-
deep
-
through
through
-
K1 Shaft flange to counterbalance
in
1.26
1.36
1.76
1.92
1.93
valve
mm3235454949
K2 Counterbalance valve,
in
3.16
3.41
3.91
4.41
4.91
centerline height
mm808799112125
V1, V2 Ports, valve
P1, P2 Ports, housing
Digital drawings are available
all sizes
all sizes
ISO 11926-1 – 7/16-20 (SAE-4)
ISO 11926-1 – 7/16-20 (SAE-4)
Reference Guide
Drawings can be provided in .pdf, .tif, .dxf and AutoCAD 2000 .dwg formats.
Please send an email to [email protected], or call +1 800 327 2589
(US and Canada), or +1 360 825 1601 (Worldwide).
5
Torque Comparisons
Driving and Holding Torque Versus
Hydraulic Pressure
Moment Loads
The driving torque of L20 Series actuators is
approximately linear with available hydraulic pressure.
L20 Series actuators also exhibit much higher holding
torque than driving torque for a given pressure.
Breakaway pressure is approximately 400 psi (28
bar) for all models. Applied loads and other operating
parameters can affect torque output by as much as
±15 percent.
The L20 Series is designed to support large moment
and radial loads. However, as moment and radial
loads increase, the bearing friction reduces the driving
torque. Other operating parameters can affect torque
output by as much as ±15 percent.
Torque vs. Moment
L20 Series
350%
120%
300%
100%
Torque, % Rated Drive
Torque, % Rated Drive
Torque vs. Pressure
L20 Series
250%
200%
150%
100%
60%
40%
20%
50%
0%
80%
0
1,000
2,000
3,000
0%
0
Moment, % Rated Straddle
Pressure, psi
Drive
Holding
6
50%
Drive
Holding
100%
Ordering Information
The L20 product line is available in a variety of sizes and
options to meet your specific application requirements. The
Model Code below outlines standard options that can be
furnished with L20 Series actuators. Please contact Helac
Corporation for special requirements.
Typical Model Code
L20 - 4.5 - E - FT - 180/120 - S1 - C - H
1
2
1
L20 Actuator Series
2
Torque Output (in-lbs x 1000)
3
4
4.5 8.2 15 25 39
3
Measurement System
English System
E
Metric System
M
Special Custom Design
S
4
Housing Configuration
FT Foot Mount
5
Standard Rotation
180 180 Degrees
5
6
7
6
8
9
Special Rotations
(Standard design with internal stop tube to limit
rotation - indicates final rotation)
7
Shaft Configuration
S1 Cantilever Mounted Shaft Option
S2 Straddle Mounted Shaft Option
8
Valve Options
With Counterbalance Valve
C
Without Counterbalance Valve
O
9
Seals
Standard Seals & Bearings
H
Special Seals & Bearings
S
Important Notice
Helac Corporation does not assume any responsibility beyond the
design and performance of its rotary actuator product due to the
unlimited variety of operating conditions and applications. The
customer is solely responsible for the final selection of any Helac
Corporation product or system and its suitability for the application in
question.
The overall integrity of the installation, and the application’s safety
and compliance with industry standards and warning requirements
are the ultimate responsibility of the customer. The customer is solely
responsible for the engineering of mating structures, fasteners, and
other associated components related to the installation of the product
and its ultimate application. Helac Corporation recommends that
prototype testing be conducted to verify installation integrity. Testing
with applied loads that equal or exceed the static and dynamic load
frequency and intensity are recommended to determine the suitability
of the actuator for the application.
Documents or information provided by Helac Corporation, its
subsidiaries or authorized distributors are intended for users having
technical expertise. It is important to thoroughly analyze all aspects of
your application and review current product information.
WARNING
IMPROPER SELECTION, INSTALLATION OR USE OF HELAC
PRODUCTS OR SYSTEMS MAY RESULT IN FAILURE AND CAUSE
DEATH, PERSONAL INJURY OR PROPERTY DAMAGE.
Documents or information provided by Helac Corporation, its
subsidiaries or authorized distributors are intended for users
having technical expertise. It is important to thoroughly analyze
all aspects of your application and review current product
information. The user is solely responsible for the final selection
of any Helac Corporation product or system and its suitability for
the application in question.
7
Helac Corporation
About Helac Corporation
A leader in the rotary actuation industry for over 40 years, Helac
Corporation manufactures a comprehensive line of hydraulic
rotary actuators used to move, support, and position rotary
loads. Helac rotary actuators are best known for their
tremendous torque output, compact dimensions, exceptional
load bearing capability and rugged, reliable performance.
Helac offers a myriad of product lines to meet individual
application requirements:
APPLICATIONS
TOP INDUSTRIES SERVED
Agriculture • Construction • Energy
Marine • Material Handling • Military
Mining • Truck/Trailer
• L-Series LoadBear — Incorporating integral bearings for
heavy load carrying applications, the L-Series is available
in the L10, L20 and L30 product lines.
• T-Series TorqBear — With a thru-shaft configuration, the
T-Series is designed for torque applications.
• Custom Designs — Helac’s rotary actuators for OEMs are
customized to meet our customers’ individual application
requirements.
Aerial Work Platforms
Carousel rotation, drill positioning,
rod handling, shotcrete,
roof bolting
Refuse / Recycling
Vehicles
Construction Equipment
Agricultural Harvesters
Paving and Curbing
Equipment
• Construction equipment attachments — Helac
PowerTilt ® and PowerGrip® increase the utilization
and productivity of backhoes and excavators.
Over 1,000 worldwide customers in diverse industries
depend on Helac actuators for quality, reliability, ease-of-use
and durability.
Arm articulation and cart lifting
To learn more about Helac’s rotary
actuator solutions, call 800.327.2589 (US
and Canada), 360.825.1601 or visit our
website at www.helac.com.
Mining Equipment
Platform, basket and jib rotation
Boom positioning, head rotation,
wheel steering
Bucket swing, gripping, specialty
attachments
Wheel and track steering
Helac Corporation
225 Battersby Avenue
Enumclaw, WA 98022 USA
Phone: 800.327.2589
360.825.1601
Fax: 360.825.1603
Email: [email protected]
www.helac.com
© 2011 Helac Corporation. All rights reserved. Specifications subject to change without notice.
Sweepers / Scrubbers
Brush positioning, steering, tipping
and dumping
Forklifts
Fork swing, specialized
attachment rotation, steering
HA L20B/08.11