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 entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, 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.QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243TO PLACE A DOCUMENT
3、 ORDER; (724) 776-4970 FAX: (724) 776-0790SAE WEB ADDRESS http:/www.sae.orgCopyright 1990 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.A.SURFACEVEHICLE400 Commonwealth Drive, Warrendale, PA 15096-0001RECOMMENDEDPRACTICESubmitted for recognition as an American National Sta
4、ndardJ1335ISSUEDAPR90Issued 1990-04HYDRAULIC CYLINDER NO-LOAD FRICTION TESTForewordThis Document has not changed other than to put it into the new SAE Technical Standards BoardFormat.1. ScopeApplies to hydraulic cylinders, which are components of self-propelled work machines defined in SAEJ1116.1.1
5、PurposeTo provide a laboratory method for determining the static and dynamic friction of a hydrauliccylinder at no-load conditions.2. References2.1 Applicable PublicationsThe following publications form a part of the specification to the extent specifiedherein. Unless otherwise indicated the lastest
6、 revision of SAE publications shall apply.2.1.1 SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.SAE J1116Categories of Off-Road Self-Propelled Work MachinesSAE J1276Standardized Fluid for Hydraulic Component Tests3. Definitions3.1 Static Breakaway PressureThe mi
7、nimum pressure that initiates movement of the piston under no externalload.3.2 Dynamic Drag PressureThe minimum pressure differential across the cylinder that is required to maintainconstant velocity after breakaway at no load.4. Testing Conditions4.1 Accuracy of MeasurementThe accuracy of measureme
8、nts unless otherwise stated shall be:a. Temperature 3 C (5 F)b. Pressure 2%c. Flow 2%d. Time 2%e. Length 2%COPYRIGHT Society of Automotive Engineers, Inc.Licensed by Information Handling ServicesSAE J1335 Issued APR90-2-4.2 Test TemperatureThe test temperature shall be 20 C (68 F) unless otherwise s
9、pecified.4.3 Test FluidThe test fluid shall be SAE 1276 unless otherwise specified.5. Test Equipment5.1 Use a fluid power source capable of delivering a pressure necessary to overcome the static breakawaypressure of the cylinder.5.2 Use a means of indicating pressure at the rod end and cap ports.6.
10、Test Procedure6.1 Cycle the cylinder until the fluid and apparatus temperatures are stabilized.6.2 Position the cylinder horizontally with the barrel restrained and the rod end free. Locate the piston at the strokemidpoint of the cylinder under test. Install pressure measuring instrumentation in the
11、 rod end and cap end portand install the flow meter at the cap end of the cylinder.6.3 After allowing a minimum of 2 min to permit the rod and piston seals to settle in normal static positions,gradually apply increasing pressure to the rod end port of the cylinder. The flow rate during the dynamic d
12、ragtest must be at a minimum to insure that pressure drops through the lines and that the connections do notinfluence the results.6.4 Record on the data sheet the time elapsed between 6.1 and 6.3 as follows:a. The fluid temperatureb. The static breakaway pressurec. The flow rate during the dynamic d
13、rag pressure testd. The inlet and outlet pressures to determine the dynamic drag pressure.Repeat this test a minimum of two times.6.5 Repeat the previous test for the reverse direction.6.6 Record on the data sheet as follows:a. The fluid temperatureb. The static breakaway pressurec. The flow rate du
14、ring the dynamic drag testd. The inlet and outlet pressures to determine the dynamic drag pressure.Repeat this test a minimum of two times.PREPARED BY THE SAE OFF-ROAD MACHINERY TECHNICAL COMMITTEESUBCOMMITTEE 4HYDRAULIC FLUID POWER SYSTEMS AND COMPONENTSOF THE SAE OFF-ROAD MACHINERY TECHNICAL COMMI
15、TTEECOPYRIGHT Society of Automotive Engineers, Inc.Licensed by Information Handling ServicesSAE J1335 Issued APR90RationaleIntroductionIn hydraulic fluid power systems, a hydraulic cylinder is a means to convert fluidpressure into mechanical force. The configuration and materials used in the design
16、of a cylinder arecritical factors influencing its function. The static and dynamic friction characteristics of a hydrauliccylinder are an indication of its mechanical efficiency.This SAE Recommended Practice is written to provide a method for determining the no load friction of ahydraulic cylinder.
17、It was based originally on a BFPR document OSU HC-2.HISTORY:Date Activity3 Feb 76 Project started by WG-3 of CIMTC, SC 41 Jun 78 Balloted By Sc 4 15 Appl, 1 Disappl, 0 Waive, 15 No Replies6 Aug 79 Balloted by SC 4 14 Appl, 0 Disappl, 0 Waive, 18 No Replies28 Oct 80 Balloted by SC 4 20 Appl, 1 Disapp
18、l, 4 Waive, 7 No Replies30 Jun 82 Balloted by ORMTC 19 Appl, 7 Disappl, 3 Waive, 6 No Replies10 May 88 Balloted by SC 4 15 Appl, 0 Disappl, 0 Waive, 7 No Replies10 May 88 Balloted by ORMTC 18 Appl, 0 Disappl, 3 Waive, 7 No RepliesThis document has been extensively revised to resolve the SC 4 and ORM
19、TC disapprovals. There is noknown parallel ISO standard.Relationship of SAE Standard to ISO StandardNot applicable.ApplicationApplies to hydraulic cylinders, which are components of self-propelled work machines defined inSAE J1116.Reference SectionSAE J1116Categories of Off-Road Self-Propelled Work
20、MachinesSAE J1276Standardized Fluid for Hydraulic Component TestsDeveloped by the SAE Off-Road Machinery Technical CommitteeSubcommittee 4Hydraulic Fluid Power Systems and ComponentsSponsored by the SAE Off-Road Machinery Technical CommitteeCOPYRIGHT Society of Automotive Engineers, Inc.Licensed by Information Handling Services
