1、This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 1 of 5 NAVISTAR, INC. Material, Parts, and Process Specifications (
2、MPAPS) NUMBER: MPAPS S-N-7.101-GS/PL Former Designation: ESP-N-7.101-GS TITLE: Spiral Retaining Rings - English Series (Noun Code 7175) CURRENT REV No.: 1506 DATE: June 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: ESP-N-7.101-GS - September 2000 PRINTE
3、D COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION This specification may involve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and he
4、alth practices and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, PP, NPP, NR. 1.0 GENERAL: This standard conforms essentially with the American National Standard B-27.6 for General Purpose Uniform Cross Section Spiral Retai
5、ning Rings. 2.0 RESTRICTED CHEMICAL SUBSTANCES: Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification. 3.0 CONTENTS: Page General 1 Restricted Chemical Substances 1 Applicability 2 Material 2 Finish
6、 2 Crimp 2 Removal Notches or Slots 3 Dish 3 Misalignment 3 Lateral Deformation 4 Ring Section Edge Radius 4 Total Free Height 4 Performance Test 4 Ring Gages 5 Assembly Precautions 5 Maximum Groove Bottom Radii 5 Alternate Groove Design 5 Workmanship 6 Policy for Selecting Parts for New Design 6 Pa
7、rt List 6 Technical Information 6 NUMBER: MPAPS S-N-7.101-GS/PL TITLE: Spiral Retaining Rings REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liabili
8、ty. 2015 by Navistar, Inc. JUNE 2015 Page 2 of 6 4.0 APPLICABILITY: The rings denoted in this standard are intended primarily for use with the shaft, housing, and groove sizes recommended; however, in certain cases these diameters may be altered somewhat to suit the requirements of a particular desi
9、gn. When such changes are made, care should be taken to not alter the shaft or housing size to such an extent that the ring will take enough permanent set to allow a loose fit after the ring has been assembled into the groove. Neither should the groove diameter be altered to the extent to permit the
10、 ring to fit loosely. 5.0 MATERIAL: Carbon Spring Steel (CST) - Retaining rings made from carbon spring steel will conform to the chemical composition of SAE 1070 to 1090 or AISI 1070 to 1090 or equivalent and have the following physical properties. Special materials are identified on dimensional an
11、d part number pages with material abbreviations immediately following the size number. Material Thickness (minimum) Rockwell Scale Hardness Tensile Strength (psi) .0067 15N 85-90 269,000 - 299,000 .0142 30N 68-73 255,000 - 285,000 .0213 A 72-78 221,000 - 251,000 .0433 C 43-49 211,000 - 236,000 Stain
12、less Steel (SST) - Retaining rings made from corrosion resistant steel will conform to the chemical composition of SAE 30302 or equivalent and have the following physical properties: Material Thickness (minimum) Rockwell Scale Hardness Tensile Strength (psi) .008 15N 83.0-86.0 210,000 - 250,000 .016
13、 30N 64.0-69.5 210,000 - 250,000 .023 A 72.0-74.9 200,000 - 230,000 .048 C 39.8-48.5 185,000 - 235,000 .062 C 38.0-47.0 175,000 - 225,000 6.0 FINISH: Retaining rings will be plain and will have an oil dipped finish unless otherwise specified. Finishes other than plain are identified on dimensional a
14、nd part number pages with finish abbreviations. Plated or coated rings which are subject to hydrogen embrittlement will be baked for three hours at 375F, or other suitable times and temperatures, as soon as possible after the plating or coating operation to obviate such embrittlement. 7.0 CRIMP: Unl
15、ess otherwise specified, the following types of rings and sizes will be uncrimped: K suffix for sizes listed will be crimped. Ring Type Nominal Ring Size Internal and External Medium Duty, Series RR - RS .500 1.500 Internal and External Heavy Duty, Series RRT - RST .469 - 1.500 Internal Standard Dut
16、y, Series RRN .500 - .750 External Standard Duty, Series RSN .469 - .669 All other rings will be crimped. See Figure 2 for crimped illustration. NUMBER: MPAPS S-N-7.101-GS/PL TITLE: Spiral Retaining Rings REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reprod
17、uced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 3 of 6 8.0 REMOVAL NOTCHES OR SLOTS: Unless otherwise specified, the ring will have removal notches or slots as follows: Ring Type Nominal Ring Siz
18、e Removal Provision Internal and External Medium Duty, Series RR - RS .500 - 2.750 2.813 - 11.000 Notch Slot or Notch Internal and External Heavy Duty, Series RRT - RST All Notch Internal and External Standard Duty, Series RRN - RSN All Notch 9.0 DISH: The dish will be considered the height differen
19、ce indicated in Figure 1 and will not exceed the values shown in the following table: Figure 1 Radial Wall Maximum Allowable Dish Radial Wall Maximum Allowable Dish 0 - .039 .001 .225 - .259 .008 .040 - .069 .002 .260 - .294 .009 .070 - .099 .003 .295 - .339 .010 .100 - .129 .004 .340 - .394 .011 .1
20、30 - .159 .005 .395 - .474 .012 .160 - .194 .006 .475 - .649 .013 .195 - .224 .007 .650 - 1.000 .014 10.0 MISALIGNMENT: The leaves of the ring will lie above each other as specified below and illustrated in Figure 2: Figure 2 Nominal Ring Size Maximum Misalignment Max Radial Deformation .375 - .984
21、.010 .010 1.000 - 1.969 .020 .010 2.000 - 5.905 .045 .020 6.000 and Above .070 .020 NUMBER: MPAPS S-N-7.101-GS/PL TITLE: Spiral Retaining Rings REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. S
22、uppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 4 of 6 11.0 LATERAL DEFORMATION: Lateral deformation may be cutoff deformation or lateral kink as illustrated. Lateral kink usually exists over a short section of the ring circumference and is not the same as
23、 helix which is a uniform slope along the entire 360 degrees. Lateral deformation will be inspected by placing the ring between parallel hardened and ground steel platens equipped with a deflection gage graduated in thousandths so located that readings are obtained at approximately the center of the
24、 platens. The specimen will then be compressed under a ten (10) pound load and the distance between the platens determined. The ring will be acceptable if this distance does not exceed the minimum recommended groove width “F.“ A comparatively simple inspection fixture is depicted in Figure 3. Figure
25、 3 12.0 RING SECTION EDGE RADIUS: The edges of the ring material will be rounded and the radius will not be less than T/8 nor more than T/4 where T equals the ring thickness. Ring thickness will be measured under 10 pounds load as. illustrated in Figure 3 and described under Lateral Deformation but
26、will be measured in a location other than at the ring ends or gap. 13.0 TOTAL FREE HEIGHT: The maximum total free height, Smax, will not exceed the sum of the maximum section thickness Bmaxplus .375 x nominal section thickness Bnom: 14.0 PERFORMANCE TEST: The suitability of the retaining rings with
27、regard to uniformity of temper and section will be determined by the rings being capable of successfully passing the following described tests. External rings after having been expanded to pass over external gage diameter “E1“ will not in the free state be entered by external gage diameter “D“ when
28、the axes of the ring and gage are parallel. Internal rings after having been compressed to fit into internal gage diameter “E1“ will not in the free state enter internal gage diameter “D“ when the axes of the ring and gage are parallel. NUMBER: MPAPS S-N-7.101-GS/PL TITLE: Spiral Retaining Rings REV
29、ISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 5 of 6 15.0 RING GAGES: External Ring Gage Diameter El-
30、 The external ring gage diameter Elis equal to the nominal shaft size, Enom, with a tolerance of +.001, -.000: El= EnomExternal Ring Gage Diameter D - The external ring gage diameter D is equal to the minimum recommended groove diameter, Gmin, minus .005 times the nominal shaft diameter, Enom, with
31、a tolerance of +.000, -.001. Internal Ring Gage Diameter El- The internal ring gage diameter E is equal to the nominal housing size, Enom, with a tolerance of +.000, -.001: E1= Enom Internal Ring Gage Diameter D - The internal ring gage diameter D is equal to the maximum recommended groove diameter,
32、 Gmax, plus .005 times the nominal housing diameter, Enom, with a tolerance of +.001, -.000: 16.0 ASSEMBLY PRECAUTIONS: Care should be exercised not to over-expand external rings or over-contract internal rings upon installation for this may lead to failure of the assembly. Rings which are radically
33、 loose in grooves should not be used. 17.0 MAXIMUM GROOVE BOTTOM RADII: From .500 to 1.000 = .005, over 1.000 = .010. 18.0 ALTERNATE GROOVE DESIGN: In applications where shafts are subjected to critical bending loads or fatigue, it is recommended that the alternate groove design specified in Figure
34、4 be used to minimize stress concentration. Figure 4 NUMBER: MPAPS S-N-7.101-GS/PL TITLE: Spiral Retaining Rings REVISION: 1506 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume
35、 all patent liability. 2015 by Navistar, Inc. JUNE 2015 Page 6 of 6 19.0 WORKMANSHIP: Retaining rings will be free from burrs, rust, pit marks, cracks and all other defects that might affect their serviceability. 20.0 POLICY FOR SELECTING PARTS FOR NEW DESIGN: Approved parts are so designated to red
36、uce variety of parts and assure maximum availability, interchangeability, and cost savings in volume buying. For new design, parts shall be selected from “Approved“ part list only. 21.0 PART LIST: 21.1 Medium Duty, Internal (Series RR) * 21.1.1 Approved: Size Number Housing Dia. E Ring Dimensions Gr
37、oove Dimensions Part Number Free Diameter Thickness Radial Wall Diameter Width A Tol B Tol C Tol G Tol F Tol 81K .812 .853 +.013 -.000 .031 .002 .065 +.003 -.005 .843 .003 .036 382234R1 * For vendor series location and cross reference, see MPAPS S-N-5.101-GS/PL. Three turn crimped. 22.0 TECHNICAL IN
38、FORMATION: For further information related to the technical content of this specification, contact: Suppliers may purchase controlled copies of this specification by contacting: Materials Engineering and Technology Dept. 10400 W. North Avenue Melrose Park, IL 60160 E-mail: MaterialsEngineeringN IHS Global Inc. 15 Inverness Way East Englewood CO 80112-5776 Phone: 1-800-854-7179 E-mail: AutomotiveIHS.com Website: http:/
