Hydraulic Steering Units OSP Reaction RM Technology

Hydraulic Steering Units OSP Reaction RM Technology
Data Sheet
Hydraulic Steering Units
OSP Reaction RM Technology
What are Danfoss RM steering units?
In general, reaction type steering units are applied to
vehicles on which a self-alignment steering effect is
desired. Reaction type steering resembles a car where
the direction of travel will continue straight ahead
when ever the steering wheel is not touched. The selfalignment effect in fully hydraulic steering systems is
achieved by using both an appropriate steering unit
and front axle components.
The trend for vehicles, such as a tractor, is higher
transportation speed. This raises a need for improved
steering performance to ensure optimal vehicle
handling on-road. Hence the introduction of Danfoss
RM technology.
RM technology represents a significant leap forward
in performance with reaction type steering units. With
RM steering units Danfoss is raising the bar and
setting new standards compared to reaction
performance achievable with previous industry
standard designs. Traditional limitations and tradeoffs of previous reaction designs have been largely
eliminated.
RM technology has patents pending for Danfoss.
Features
For the vehicle designer several
advantages are offered:
• Optimized reaction performance
•
•
(+100% faster self-alignment)
‒ Improved automotive feel
‒ Superior roading performance
through strong and genuine road
feedback
Utilize reactive steering – also on higher
displacement steering unit
‒ Can also be used for high horse
power tractors
‒ Up to 500 cc/rev
Open center and load sensing models
available
© Danfoss | Jun 2016
‒ Open center ORM
‒ Load sensing LSRM
• OSPE offers the possibility to select
between reaction and non-reaction
using RM technology
‒ Reaction for on road use
‒ Non reaction for off road /
electrohydraulic mode
Comprehensive technical literature online
at powersolutions.danfoss.com
11063723 | AI00000061en-US0202 | 1
What really matters is inside – So what is inside an RM steering unit?
Fundamentally an RM steering unit contains all the same design elements as traditional reaction type steering units. It also shares the
same typical operating characteristics.
While in neutral the spool/sleeve set will allow oil to flow from the cylinder, through the spool/sleeve set, to the gear wheel set, back
through the spool/sleeve set and back to the cylinder.
A pressure difference in the cylinder drives the oil flow through the gear wheel set to turn the steering wheel. The pressure difference in
the cylinder is generated by the front axle geometry and the weight resting on the front axle. Around straight ahead this pressure
difference will approach zero and oil flow will stop.A pressure difference in the cylinder drives the oil flow through the gear wheel set to
turn the steering wheel. The pressure difference in the cylinder is generated by the front axle geometry and the weight resting on the
front axle. Around straight ahead this pressure difference will approach zero and oil flow will stop.
LSR / LSRM comparison
Self alignment speed versus cylinder pressure
50
Front axle
LSRM
LSR
40
RPM
30
20
L
10
R
RM steering unit
0
0
2
4
6
8
10
12
14
16
18
Bar
P301 149
Flow restrictions
Spool/sleeve set
The RM technology significantly improves oil flow through the
steering unit during self-alignment operation.
Special grooves machined into the spool/sleeve set interconnect
individual variable orifices to effectively reduce the pressure drop
to less than half of previous reaction designs.
Gear wheel set
For any questions relating to RM Technology please contact your
nearest Danfoss representative.
Steering wheel
P301 148
Reaction type steering units inherently include unwanted flow
restrictions in the flow path, especially through the spool/sleeve
set. These restrictions limit the self-alignment speed and thus
reduce reaction performance.
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products
already on order provided that such alterations can be made without changes being necessary in specifications already agreed.
All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
2 | © Danfoss | Jun 2016
11063723 | AI00000061en-US0202
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