STEERINGTechnical Information SBX advanced steering valve

White is a leading global provider of motor and steering solutions that power the evolution of mobile and industrial applications around the world.

Contents: Key definitions and acronyms____________________________________________________________ 4 Chapter 1 _______________________________________________________________________ 5 Introduction__________________________________________________________________________ 5 Product overview ______________________________________________________________________________ Features _____________________________________________________________________________________ Benefits ______________________________________________________________________________________ Typical applications ____________________________________________________________________________...

Cylinder relief valve Load sense relief valve Electronic control unit Input output module Isolation Valve Valve that blocks steering flow from reaching the steer cylinders Load reaction valve Valve that dictates if the SCU will behave as a load reaction or non-reaction SCU (for definition on reaction types, see the White steering catalog) Main spool Proportional spool that controls gain, through notch design, of both meter-in and meter-out of steering flow Mode select valve Valve that directs pressure to open or close the isolation valve as well as the load reaction switching valve Steering control...

The SBX is WHITE’S premier CAN controlled electrohydraulic steering valve that can be paired with one of WHITE conventional steering control units to provide advanced EH steering or can be coupled with a manifold valve assembly to provide steer-by-wire functionality. The SBX valve provides mobile off-highway equipment OEMs with a functionally safe and flexible means to implement electronically controlled hydraulic steering on their machines. The inclusion of CAN communication and an onboard spool position sensor yields high precision flow control and opens the door for additional diagnostics...

Provides safety • Suitable for applications up to PLd in accordance with ISO 13849-1 • Material handling o Dock side equipment, cranes, telehandlers, forklifts o Wheel loaders, pavers, etc. o Tractors, harvesters, sprayers

Chapter 2 Product overview

Product introduction The SBX is a two-stage proportional valve. The main valve is a closed-center, load sense valve which is designed to supply proportional flow to the steering application with high accuracy and ~zero hysteresis. An isolation spool is used, which “isolates” the main-stage spool from the work ports. It is normally closed and piloted (to open) by an on/ off solenoid valve. During normal operation, the isolation valve must remain actuated in order to ensure flow can be delivered to and from the work ports. By removing power to the “mode select valve” the isolation valve can be...

10 Table 1: Three common SBX configurations Figure 1: Three common SBX configurations Steer-by-wire (SbW) - Fail safe A fail-safe steer-by-wire steering system uses the SBX valve without any additional steering device. Advantages of this architecture are: • Flexible mounting location • Reduction of in-cab noise • Flexible input device sensors: steering wheel, joystick, • mini-steering wheel • Lower cost than redundant steering systems The hazard analysis of the application should indicate if a fail-safe steer-by-wire system is appro

'S, WHITE This type of architecture would allow for the steering system to be isolated when a safety function is activated by way of the integrated isolation valve. 2) Main stage valve Control Manifold 3) Mode select valve (externally powered) 4) Pressure reducing valve (pilots) 5) Load sense shuttle valve 6) Proportional pressure reducing valves 7) Redundant LVDT spool sensor 8) Cylinder port relief valves Figure 2.2: SBX SbW (fail-safe) hydraulic circuit

Fail-operational Electrohydraulic (EH) Steering An electrohydraulic (EH) steering system uses the SBX in parallel with a steering control unit. In an EH architecture, the SBX valve can be mounted directly on top of the SCU or remotely mounted and coupled with hydraulic hoses. Advantages of this architecture are: • A fail-operational system • A traditional operator steering user interface and feel The hazard analysis of the application should indicate if a fail - operational system is appropriate. This type of architecture would allow for the electro-hydraulic portion of the steering system to...

2) Main stage valve 3) Mode select valve (externally powered) 4) Pressure reducing valve (pilots) 5) Load sense shuttle valve 6) Proportional pressure reducing valves 7) Redundant LVDT spool sensor_ 23) Cylinder port relief valves (SCU) 24) Load sense relief valve (SCU) Figure 3.2: SBX EH (fail-operational) hydraulic circuit A fail-operational steering system uses the SBX in parallel with a backup steering manifold. In this type of architecture, the SBX valve can be mounted directly on top of the backup manifold or remotely mounted and coupled with hydraulic hoses. Advantages of this architecture...

11) Proportional steering valve 12) Backup activation valve 13) Load sense shuttle valve 2) Main stage valve 3) Mode select valve (externally powered) 4) Pressure reducing valve (pilots) 5) Load sense shuttle valve 6) Proportional pressure reducing valves 7) Redundant LVDT spool sensor 8) Cylinder port relief valves

Chapter 3 SBX Valve Details

Isolation valve

Technical data and specificationsPressures Rated inlet port P 210 bar (3045 psi) SBX low flow 30 L/min (7.9 gal/min) SBX high flow 60 L/min (15.9 gal/min)

'S, WHITE Actuation command options Standard version (SBX only) 8 kg (17.6 lb)

19 Model code specificationsModel code of an SBX: Position Nominal flow rating Mounting configuration Control Input Inlet pressure rating Neutral circuit Valve Options 12,13,14 Load Sense Relief Setting* 15,16,17 Cylinder Relief Valve Setting* D EH - S 10 dual displacement bolt on E EH - remote mount LS A Load Sensing, Dynamic Signal 01 Cylinder Relief Valves 02 Cylinder Relief Valves, Load Reaction Valve 03 Load Reaction Valve 04 Load Sense Relief Valve 05 Cylinder Relief Valves, Load Sense Relief Valve 06 Cylinder Relief Valves, Load Sense Relief Valve, Load Reaction Valve 07 Load Reaction...