HPB Series
76Pages

Precision Machinery Company Fixed Displacement Radial Piston Staffa Motor

CONTENTS Specifications and Features Model Coding Performance Data Volumetric Efficiency Data Shaft Power Calculations Functional Symbols Shaft Stress Limits Bearing Life Notes Circuit and Application Notes Motor Operation at Low Temperatures Freewheeling Notes 2-10. Crankcase Drain Connections 2-13. Speed Sensing Options Unit Conversion

HPB Series Fixed Displacement Radial Piston Hydraulic Motor General Descriptions The Kawasaki Staffa range of high torque low speed fixed displacement radial piston hydraulic motors consists of 8 frame sizes ranging from the HPB060 to HPB325. Capacity ranges from 983 to 5,322cc/rev. The rugged, well proven design incorporates high efficiency combined with good breakout torque and smooth running capability. Various features and options are available including, on request, mountings to match competitors’ interfaces. The Kawasaki Staffa range also includes dual and triple displacement motors....

Ordering Code 1-1 Model Coding F11/HPB 060 / S3 V/ FM3/Tj/ */ P***** Fluid Type Blank Phosphate ester (HFD fluid) Water based fluids (HFA, HFB & HFC) Special features (see Section 2-12) Alternative fluids contact Kawasaki Non-catalogued features, (****) = number assigned by Kawasaki as required Heavy duty Design Series Number Frame Size Current design series for HPB motors Shaft Type See Section 3. Dimensions Speed Sensor Horizontal and vertically down Shaft Orientation Square wave output with directional signal* Combines Tj with the T401 instrument to give a 4 to 20 mA output proportional...

1-1 Model Coding Special Features Suffix Shaft Seal Enhancements Valve Enhancements High pressure shaft seal Improved cavitation resistance Improved shaft seal life High pressure shaft seal & improved shaft seal life Thermal shock resistance Improved caviation resistance & anti-clockwise Improved cavitation resistance & thermal shock resistance Anti-clockwise & thermal shock resistance Improved cavitation resistance & anti-clockwise & thermal shock resistance Marine-specification primer paint Marine-style Cylinder Head Marine-specification paint and Cylinder Head (B & D) Installation...

Technical Information 2-1 Performance Data Rating definitions Continuous rating For continuous duty the motor must be operating within each of the maximum values for speed, pressure and power. Intermittent rating Operation within the intermittent power rating (up to the maximum continuous speed) is permitted on a 15% duty basis, for periods up to 5 minutes maximum. Intermittent max pressure Intermittent max pressure: 300bar. This pressure is allowable on the following basis: a) Up to 50rpm 15% duty for periods up to 5 minutes maximum. b) Over 50rpm 2% duty for periods up to 30 seconds...

2-1 Performance Data (cont) Specifications Average Average Running Starting Mechanical Mechanical Efficiency Efficiency (%) (%) Max Cont. Power with Flushing (kW) Frame Size Displacement (cc/rev) Ideal Torque (N m/bar) Other non-standard displacements are possible - check with Kawasaki for details. 7

2-1 Performance Data (cont) Output Torque Curves These torque curves indicate the maximum output torque and power of a fully run-in motor for a range of pressures and speeds when operating with zero outlet pressure on Mineral Oil of 50cSt (232 SUS) viscosity. High return line pressures will reduce torque for a given pressure differential. HPB060 Output Power (kW) Output power kW Output Power (kW) Output power kW Output Power (kW) Output power kW

2-1 Performance Data (cont) Output Torque Curves (cont) HPB150-FM4* Output Power (kW) Output power kW 50 50 Output Power (kW) Output power kW Output power kW (kW) Power Output Output Power (kW) Output power kW Shaft Speed (rpm) * Contact Kawasaki for curves of motors with FM3 valve 9

2-2 Volumetric Efficiency Data Displacement Zero Speed Constant Speed Constant Creep Speed Constant Crankcase Leakage Constant Fluid Viscosity Viscosity Factor Frame Size Creep speed Crankcase leakage Where ΔP is differential pressure in bar, and n is speed in rpm. The motor volumetric efficiency can be calculated as follows: Volumetric efficiency (%) Example: HPB200 motor with displacement of 3.087 l/rev. Speed, n (rpm)

2-3 Shaft Power Calculation Example Firstly, to find the maximum differential pressure ΔP at rated speed: Select the rated shaft power (Ws) for the motor from the performance data table (in Section 2-1). This is presented in kilowatts so must be converted to Watts (x1000). Then also take the actual average running torque, To, in N m/bar and the rated shaft speed, n, in rpm. To . ΔP . 2π . n Ws = 60 Or to find maximum ΔP then use: Secondly, to find the maximum speed at rated pressure (using the same information as before): n= HPB125-FM4 Example: Rated shaft power, Ws (W) = 150,000 Ideal...

2-5 Stress Limits When applying large external radial loads, consideration should also be given to motor bearing lives (see Section 2-6). Frame Size Shaft Types Maximum External Radial Bending Moment [N m] Q-shafts (female spline) are not shown in the above table because they do not protrude from the front of hte motor and thus it is only possible to impart small bending moments through the application of radial loads. Example: Determine the maximum radial shaft load of a HPB080 motor where radial load acts at 100mm from the mounting face. Radial load offset, A (m) Maximum radial load, W...

2-6 Bearing Life Notes Consideration should be given to the required motor bearing life in terms of baring service life. The factors that will determine bearing life include: 1) Duty cycle - time spent on and off load 2) Speed 3) Differential pressure 4) Fluid viscosity 5) External radial shaft load 6) External axial shaft load NOTE: A heavy duty HPB motor can be ordered to further improve bearing life. Consult Kawasaki for a detailed bearing life calculation.

2-7 Circuit and Application Notes Starting Torque Staffa motors are very efficient even at low speeds. The starting mechanical efficiencies given in Section 2-1 should be used for speeds lower than 15rpm. These values, and the torque curves shown in Section 2-1 may vary with system parameters. Low Speed Operations Minimum operating speeds are determined by the hydraulic system and load conditions (load inertia, drive elasticity, etc.) Recommended minimum speeds are shown below: Frame Size Minimum operating speed (rpm) High Back Pressure When both inlet and outlet ports are pressurised...