1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2009 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA)
4、 Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SURFACE VEHICLE STANDARD J746 JUN2009 Issued 1955-12 Revised 2009-06 Superseding J746 SEP1996 Hydraulic Motor Test Procedures RATIONALE This SAE standard is revised to make minor changes to the definition and correct
5、 errors for clarification. 1. SCOPE This test code describes tests for determining characteristics of hydraulic positive displacement motors as used on construction and industrial machinery as referenced in SAE J1116. These characteristics are to be recorded on data sheets similar to the one shown i
6、n Figure 1. Two sets of data sheets are to be submitted: one at 49 C (120 F) and one at 82 C (180 F). 1.1 Purpose This test code establishes conditions for motor tests, outlines a procedure for tests, and establishes a method of presenting motor test data. The procedure covers the following determin
7、ations: a. SAE volumetric rating b. SAE running torque characteristics c. SAE stall torque characteristics d. Power output e. Power loss f. Torque efficiency g. Overall efficiency SAE J746 Revised JUN2009 Page 2 of 7 FIGURE 1 - WORK SHEET 2. REFERENCE 2.1 Applicable Publication The following publica
8、tion forms a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. SAE J746 Revised JUN2009 Page 3 of 7 2.1.1 SAE Publication Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 8
9、77-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J1116 Categories of Off-Road Self-Propelled Work Machines 3. MATERIAL AND APPARATUS 3.1 Test Fluid Test fluid shall preferably be a mineral base oil designed for hydraulic service. Fluid viscosity shall be within the
10、 limits of 95 to 115 SUS at 49 C (120 F) and 50 to 54 SUS at 82 C (180 F). 3.2 Motor Torque and Speed Measuring Apparatus Torque measurement must be accurate within 1% and speed measurement must be accurate within 0.5%. The test setup shall not impose radial or axial loads upon the driveshaft of the
11、 hydraulic motor under test. 3.3 Flow Measurement Flow measurement shall be accurate within 2.0%. 3.4 Pressure Measurement Pressure measurement shall be accurate within 2.0%. 3.5 Temperature Measurement and Control Fluid temperature shall be measured in the motor outlet line by means of a thermomete
12、r or thermocouple. Fluid temperature shall be maintained at the prescribed level throughout the test within 2.8 C ( 5 F). 3.6 Drain Line Total pressure drop in drain line, if required, shall be as low as possible. 3.7 Motor Outlet Line Total pressure drop in outlet line shall be as low as possible.
13、4. GENERAL DEFINITIONS AND TEST CONDITIONS 4.1 Temperature Shall be expressed in degrees Centigrade (C) or Fahrenheit (F). 4.2 Pressure Shall be expressed in Newtons per square centimeter gage (N/cm2g) or pounds per square inch gage (psig). 4.3 SAE Volumetric Rating The SAE volumetric rating of a hy
14、draulic motor shall be defined as delivery to the motor in liters per minute (Lpm) or gallons per minute (gpm) at a speed of 1000 rpm and zero torque on the shaft at a fluid temperature of 49 C (120 F). SAE J746 Revised JUN2009 Page 4 of 7 4.4 SAE Stall Pressure Shall be defined as the differential
15、pressure required to maintain a specified motor torque at 1 rpm. 4.5 Delivery (Input Flow) Shall be defined as the measured flow rate to the motor. It equals the sum of exhaust flow plus drain line flow. It shall be expressed in liters per minute (Lpm) or gallons per minute (gpm). 4.6 Pressure Shall
16、 be defined as the pressure differential across motor ports in pounds per square inch gage (psig) or Newtons per square centimeter gage (N/cm2g). 5. WORKING FORMULAS 5.1 SAE Theoretical Torque SAE volumetric rating (Lpm) x pressure (N/cm2g )628.3- Nm=(Eq. 1) SAE volumetric rating (gpm) pressure (psi
17、g)27.2- lb in=(Eq. 2) 5.2 SAE Theoretical Delivery (Flow) SAE volumetric rating (Lpm) x rpm1000- Lpm=(Eq. 3) SAE volumetric rating (gpm) x rpm1000- gpm=(Eq. 4) 5.3 SAE Theoretical Hydraulic Power SAE theoretical deliv ery (Lpm) x N/cm2g6- watts (W)=(Eq. 5) SAE theoretical delivery (gpm) x psig1714-
18、horsepower hp()=(Eq. 6) 5.4 Hydraulic Power Delivery (Lpm) x pressure (N/cm2g )6- watts W()=(Eq. 7) Delivery (gpm) x pressure (psig)1714- horsepower hp()=(Eq. 8) SAE J746 Revised JUN2009 Page 5 of 7 5.5 Power Output Output Torque (N m()rpm 0.105 watts= W()=(Eq. 9) Output Torque (lb-in) x rpm63 025-
19、horsepower hp()=(Eq. 10) 5.6 Power Loss Hydraulic power (W) Power output (W) = watts (W)=(Eq. 11) Hydraulic power (hp) Power output (hp) = horsepower (hp)=(Eq. 12) 5.7 Overall Efficiency Power outputHydraulic power- 100 percent (%)=(Eq. 13) 5.8 Torque Efficiency Power outputSAE theoretical hydraulic
20、 power- 100 percent (%)=(Eq. 14) Output torqueSAE theoretical torque- 100 percent (%)=(Eq. 15) 6. TEST 1 a. Set up the motor as in Figure 2, except uncoupled from load. b. Operate the motor from minimum to maximum speed in suitable increments, one speed being 1000 rpm. If 1000 rpm is too fast, opera
21、te at 100 rpm and then convert to 1000 rpm to use the SAE equations. Record inlet and outlet pressure, delivery, and rpm. c. Couple the motor to the load and repeat Test 1, step b at maximum rated torque and one intermediate torque. Record inlet and outlet pressure, torque, delivery, and rpm. d. Set
22、 up the motor as recommended in Figure 3. e. Operate the motor at 1 rpm. Record the maximum and minimum pressure differential required to maintain the same torque as in Test 1, step c. SAE J746 Revised JUN2009 Page 6 of 7 FIGURE 2 - TYPICAL TEST SETUP FOR TORQUE AND HORSEPOWER DETERMINATION FIGURE 3
23、 - TYPICAL TEST SETUP FOR STALL PRESSURE DETERMINATION SAE J746 Revised JUN2009 Page 7 of 7 7. NOTES 7.1 Marginal Indicia A change bar (I) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous
24、issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE COMMON TESTS TECHNICAL COMMITTEE SC1 ELECTRICAL COMPONENTS AND SYSTEMS HYDRAULIC SYSTEMS
