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 ther
2、efrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2015 SAE International All rights reserved. No part of this
3、publication may 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: +1 724-776-49
4、70 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J968/1_201509 SURFACE VEHICLE RECOMMENDED PRACTICE J968-1 SEP2015 Issued 1966-08
5、 Revised 1991-05 Reaffirmed 2015-09 Superseding J968-1 DEC2002 Diesel Injection Pump Testing - Part 1: Calibrating Nozzle and Holder Assemblies RATIONALE J968-1 has been reaffirmed to comply with the SAE five-year review policy. ForewordThis SAE Recommended Practice is similar to ISO 7440/1.The cali
6、brating nozzle and holder assemblies are intended to simulate closely the function of the nozzle and holderassemblies in the fuel injection system of a diesel engine. They are flow gauges and require careful handling andmaintenance.The manufacturer of the injection equipment and/or the manufacturer
7、of the engine shall specify the type ofcalibrating nozzle and holder assembly, the appropriate single hole orifice plate size or pintle nozzle (asapplicable), high pressure pipes, exact limits, etc., to be used.1. ScopeThis part of SAE J968 specifies two types of calibrating nozzle and holder assemb
8、lies intended forthe testing and setting of diesel injection pumps on test benches.It applies to:a. A calibrating nozzle and holder assembly with a single hole orifice plate;b. A calibrating nozzle and holder assembly with a delay pintle type nozzle.The approximate range of the calibrating nozzle an
9、d holder assembly is up to:a. 300 mm3/stroke with the single hole orifice plate;b. 150 mm3/stroke with the delay pintle type nozzle.Setting and maintenance requirements are specified in ISO 4008/3.2. References2.1 Applicable PublicationsThe following publications form a part of this specification to
10、 the extent specifiedherein. The latest issue of SAE publications shall apply.2.1.1 SAE PUBLICATIONSAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.SAE J967Calibration Fluid for Diesel Injection EquipmentSAE J968-2Diesel Injection Pump TestingPart 2: Orifice Plate Flow Measurem
11、ent2.1.2 ISO P UBLICATIONSAvailable from ANSI, 25 West 43nd Street, New York, NY 10036-8002.ISO 2697Road vehiclesFuel injection nozzlesSize “S”ISO 2699Road vehiclesFlange-mounted injection nozzle holders size “S”Types 2, 3, 4, 5, and 6ISO 4008/3Road vehiclesFuel injection pump testingPart 3: Applica
12、tion and test proceduresISO 4010Road vehiclesCalibrating nozzle, delay pintle typeISO 4093Road vehiclesFuel injection pumpsHigh pressure pipes for testingISO 4113Road vehiclesCalibration fluid for diesel injection equipmentISO7440/1Road vehiclesFuel injection equipment testingPart 1:Calibrating nozz
13、le and holderassembliesISO 7440/2Road vehiclesFuel injection equipment testingPart 2: Orifice plate flow-measurement3. Required CharacteristicsThe functionally critical dimensions are shown in the following diagrams:3.1 Calibrating Nozzle and Holder AssembliesWith single hole orifice plate, Figure 1
14、With delay pintle type nozzle, Figure 2.3.2 ComponentsHolder body with and without vent, Figure 3.Spring, standard, and low rate, Figure 4.Inlet stud with edge filter, Figure 5.Suggested edge filter flow measuring system, Figure 6.NOTEThe outlet of the fixture (within the dotted lines) shall be at
15、ambient pressure.Needle valve assembly, Figure 7.Single hole orifice plate and flow ranges, Figure 8.Delay pintle type nozzle is specified in ISO 4010.Distance sleeve, Figure 9.Retaining nuts, Figures 10 and 11.4. Designation4.1 General ExampleThere are many possible combinations of nozzle, nozzle h
16、older, nozzle retaining nut, andnozzle opening pressure. To facilitate identification of calibrating nozzle and holder assemblies, they shall bedesignated in code form as given by the following example:SAE J968-53-117L_ SAE INTERNATIONAL J968-1 SEP2015 2 of 13FIGURE 1CALIBRATING NOZZLE AND HOLDER AS
17、SEMBLY WITH SINGLE HOLE ORIFICE PLATE_ SAE INTERNATIONAL J968-1 SEP2015 3 of 13FIGURE 2CALIBRATING NOZZLE AND HOLDER ASSEMBLY WITH DELAY PINTLE TYPE NOZZLE_ SAE INTERNATIONAL J968-1 SEP2015 4 of 13FIGURE 3HOLDER BODYFIGURE 4SPRINGS_ SAE INTERNATIONAL J968-1 SEP2015 5 of 13FIGURE 5CHARACTERISTIC DIME
18、NSIONS AND VALUES OF INLET STUD WITH EDGE FILTER_ SAE INTERNATIONAL J968-1 SEP2015 6 of 13FIGURE 6INLET STUD FLOW MEASURING SYSTEM_ SAE INTERNATIONAL J968-1 SEP2015 7 of 13FIGURE 7NEEDLE VALVE ASSEMBLYFIGURE 8SINGE HOLE ORIFICE PLATE_ SAE INTERNATIONAL J968-1 SEP2015 8 of 13FIGURE 9DISTANCE SLEEVE_
19、SAE INTERNATIONAL J968-1 SEP2015 9 of 13FIGURE 10RETAINING NUTS (CAPNUTS) FOR CALIBRATING NOZZLE AND HOLDER ASSEMBLYWITH SINGLE HOLE ORIFICE PLATE_ SAE INTERNATIONAL J968-1 SEP2015 10 of 13FIGURE 11RETAINING NUTS (CAPNUTS) FOR CALIBRATING NOZZLE AND HOLDER ASSEMBLYWITH DELAY PINTLE TYPE NOZZLE_ SAE
20、INTERNATIONAL J968-1 SEP2015 11 of 134.2 Explanation of the DesignationThe designation comprises the following three elements:a. 1st element: SAE J968This specifies the SAE number where the calibrating nozzle and holder assemblies are defined.b. 2nd element: .53.This two-digit code is specified in T
21、ables 1 and 2 and defines the components of the calibrating nozzleand holder assembly. In this example they are:5(Tens-digit code): Orifice plate No.: 53 (Units-digit code): Vented holder body, as specified in Figure 3 (execution 1), not provided with aspray damper (see Figures 1 and 2).c. 3rd eleme
22、nt: .117LThe first three digits define the nozzle opening pressure setting in 105 pascals (bar). L indicates thelow rate spring. No letter is used for the standard rate spring.The preferred opening pressures are shown as follows:With orifice plate and standard rate spring207 + 3 barWith 0.5 mm orifi
23、ce plate and low rate spring117 + 3 barWith delay pintle type nozzle, either172 + 3 baror147 + 3 baror125 + 3 bar4.3 Structure of the 2nd Element of the Code180 to 225 N/mmTABLE 1TENS-DIGIT CODECode Type of Nozzle or Orifice Plate0- none1- nozzle type: ISO 40102- *3- *4- orifice plate No.: 45- orifi
24、ce plate No.: 56- orifice plate No.: 67- orifice plate No.: 78- orifice plate No.: 89- *NOTE The spaces marked with an asterisk (*) are available for future use.Code 0- (tens-digit) refers to a bare nozzle assembly suitable for accepting either type of nozzle assembly._ SAE INTERNATIONAL J968-1 SEP2
25、015 12 of 13PREPARED BY THE SAE DIESEL FUEL INJECTION EQUIPMENT STANDARDS COMMITTEETABLE 2UNITS-DIGIT CODECodeType of Nozzle HolderVentType of Nozzle HolderDamper-0 none none-1 not specified not specified-2 yes not specified-3 yes no-4 yes yes-5 * *-6 no not specified-7 no no-8 no yes-9 * *NOTE: The spaces markes with an asterik (*) are available for future use._ SAE INTERNATIONAL J968-1 SEP2015 13 of 13
