Radial piston hydraulic motor
52Pages

rexroth A Bosch Company ► Torque range: up to 13.6 kNm [up to 10062 lb ft] ► Speed range: up to 400 rpm ► Power range: up to 394 kW ► Maximum operating pressure: 350 bar [5 076 psi] ► Displacement: 503 to 2 513 cm3/rev [31 - 153 in3/rev] ► Specific torque: 8 to 40 Nm/bar [407 to 2 034 lbfft/1000 psi ► Frame size: 10, 20, 30, 40 Features Contents

2/52 Hagglunds Atom | RadiaL piston hydraulic motor 1 Ordering code In order to identify Hagglunds equipment exactly, the following ordering code is used. These ordering codes should be stated in full in all correspondence e.g. when ordering spare parts. Example Hagglunds Atom motor:

• = Available — = Not available !) For exact, non-rounded values of specific torque, see 4.3 Motor data page 9 2) Only available for specific torque up to 30 Nm/bar 3) See sectionlO for released special index

Hägglunds Atom | Radial piston hydraulic motor Shaft side Connection side Fig. 1: Section view of radial piston hydraulic motor 6. Cylindrical roller bearing When the hydraulic pressure is acting on the pistons, the cam rollers are pushed against the slope on the cam ring that is rigidly connected to the housing, thereby producing 4. Cylinder block, spline a torque. The cam rollers transfer the reaction force to the pistons which are guided in the cylinder block. Rotation therefore occurs, and the torque available is proportional Bosch Rexroth‘s hydraulic industrial motor Hägglunds Atom is...

Radial piston hydraulic motor | Hägglunds Atom 5/52 Fig. 2: Hydraulic symbol, radial piston hydraulic motor Port locations and dimensions, see Table 1: Port dimensions

Hägglunds Atom | Radial piston hydraulic motor Connection side of the motor Shaft side of the motor Fig. 3: Port connections Hägglunds Atom Table 1: Port dimensions Connection Description Dimensions Atom 10 - Atom 20 Main connection If A is used as the inlet, the motor shaft rotates counter clockwise, viewed from the motor shaft side Main connection If C is used as the inlet, the motor shaft rotates clockwise, viewed from the motor shaft side Drain outlet Alternative drain outlet / or flushing inlet Alternative drain outlet / or flushing inlet Flushing connection For flushing of radial lip...

Radial piston hydraulic motor | Hagglunds Atom Note! Since this size of hydraulic motor often is used in open Loop systems, calculations in chapter 4 Technical data, are calculated with 2 bar (29 psi) low pressure. Table 2: Calculation fundamentals.Metric US Output power Output torque (nm=98%) Pressure required (nm=98%) Flow rate required Output speed Inlet power Quantity Symbol Power P Flow rate required q Total volumetric loss q[ Mechanical efficiency nm 1) Not valid for starting efficiency

8/52 Hagglunds Atom | RadiaL piston hydraulic motor Table 3: General data (metric) Moment of inertia for rotary group lbm-ft2 2.068 3.752 5.413 6.984 1 Peak pressure 6091 psi maximum, allowed to occur up to 10 000 times Momentary pressure spikes t< 0.1 s of up to 116 psi are permitted

Radial piston hydraulic motor | Hagglunds Atom 9/52 Table 5: Specific data (metric) Note! For minimum speed guidance, please see section 4.14. Low speed performance. > Calculated as: US= Ts • (5076-29) • 0,98 4) The motors are designed according to DNV-rules. Test pressure 6000 psi. Peak pressure 6000 psi maximum, allowed up to 10 000 times. 5) Flushing of motor case is required. See 4.10 Flushing

Hägglunds Atom | Radial piston hydraulic motor The motor working in braking mode The hydraulic system must be such that the motor will Required low pressure at the inlet port is according recieve sufficient low pressure at the low pressure port. This applies to all types of installations. The pressure at the low pressure port shall be at least one bar above the case pressure. 4.4.1 The motor working in driving mode only The required low pressure at the low pressure port, The diagrams are valid for 1 bar (14,5 psi) case pressure. should be according to diagram. See Fig. 4: With increasing...

Radial piston hydraulic motor | Hägglunds Atom 11/52 Fig. 5: Recommended low pressure for motor workning in braking mode, Hägglunds Atom 2-port connection. Valid for oil viscosity 40 cSt.

Hägglunds Atom | Radial piston hydraulic motor Details regarding the selection of hydraulic fluid Hydraulic fluids The hydraulic motor Hägglunds Atom is primarily designed for operation with hydraulic fluids according to ISO 11158 HM. The hydraulic fluid should be selected such that the operating viscosity in the temperature range, as measured in the motor housing, is within optimum operation range, see Before the start of project planning, see data sheet Fig. 6. General recommendation is to have a system tem- RE 15414, Hydraulic fluid quick reference, for detailed perature of 50°C, see...

Radial piston hydraulic motor | Hägglunds Atom 13/52 Overall efficiency The diagrams are valid for oil viscosity 40 cSt and low pressure 2 bar (29 psi) at the motor main ports A or C. Each diagram has the following label definitions: 1. Output power, kW 2. Constant pressure curves, bar 3. Overall efficiency, % 4. Flushing of motor case is required. Fig. 10: Atom 20 16 RE 15354/01.2021, Bosch Rexroth AB

Hägglunds Atom | Radial piston hydraulic motor Fig. 15: Atom 30 28 Bosch Rexroth AB, RE 15354/01.2021

Radial piston hydraulic motor | Hägglunds Atom 15/52

Hägglunds Atom | Radial piston hydraulic motor Pressure loss diagrams Actual pressure difference = output torque specific torque ⋅ mechanichal effiency Fig. 21: Atom 10 to Atom 40 pressure loss

Radial piston hydraulic motor | Hägglunds Atom 17/52 Quick selection diagram Rated life for Hägglunds Atom is calculated according to DIN ISO 281 Apendix 1. The diagram below represents the torque and speed, corresponding to a modified rating life L10mh = 20 000 h. Oil viscosity in motor case 40 cSt. Contamination level not exceeding 18/16/13 according to ISO 4406 (NAS 1638, class 7). The diagram is based on a low pressure of 2 bar (29 psi). Torque [kIbf*ft] Fig. 22: Quick selection diagram Note! Higher case oil viscosity increases the motor rating life considerably. Reduced temperature in...