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. JANUARY 2015 Page 1 of 6 NAVISTAR, INC. Material, Parts, and Process Specification
2、s (MPAPS) NUMBER: MPAPS S-NM-5.101-GS/PL Former Designation: ESP-NM-5.101-GS TITLE: Tapered and Reduced Cross Section (Circlip) Retaining Rings Metric Series (Noun Code 7175) CURRENT REV No.: 1501 DATE: Jan. 2015 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES:
3、 ESP-NM-5.101-GS - August 2006 PRINTED 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
4、 to consult appropriate safety and health practices and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to New MPAPS format; Combined GS, PP. 1.0 GENERAL: This standard contains the essentials of the following standards: British Standards Institute: BS 3673 G
5、erman Institute of Standardization: DIN 471, 472 and 6799 Inch series rings may be found on MPAPS S-N-5.101-GS/PL. 2.0 CONTENTS: Page General 1 Ring Types 1 Miscellaneous Dimensions 2 Material and Hardness 2 Finishes 3 Restricted Chemical Substances 3 Color Coding 3 Method of Designation 3 Performan
6、ce Requirements 3 Workmanship 4 Policy for Selecting Parts for New Design 4 Part List 4 Technical Information 6 3.0 RING TYPES: Retaining rings in this standard are provided for both external and internal applications on shafts and in housing bores respectively and are described as follows: External
7、 Regular (EXT-REG) and External Heavy (EXT-HVY) These rings are designed to install into grooves on shafts to provide an external shoulder for locating and retaining a part on the shaft. External E (EXT-E): These rings are designed to be installed radially on a shaft directly in a plane of the groov
8、e to provide an external shoulder for retaining a part on the shaft. NUMBER: MPAPS S-NM-5.101-GS/PL TITLE: Tapered and Reduced Cross Section (Circlip) Retaining Rings REVISION: 1501 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate
9、 Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JANUARY 2015 Page 2 of 6 Internal Regular (INT-REG) and Internal Heavy (INT-HVY): These rings are designed to install into grooves in housing bores to provide an internal shoulder for locating and ret
10、aining a part within the housing. 4.0 MISCELLANEOUS DIMENSIONS: The following requirements will supplement the data given in the dimensional charts. Holes or (Slots): The diameter of the holes will be in accordance with the dimensional charts and sufficient material will be retained around each hole
11、 (or either side of each slot) to ensure that no permanent distortion of the ring will result when pliers are applied during assembly. Lug Filet: A filet of minimum radius equal to the maximum thickness of the ring will be formed adjacent to each lug. The filet will blend smoothly with the lug profi
12、le. Radial Flatness (Dish): Radial Flatness will be considered as the height difference occurring between the inner and outer peripheries of the ring, measured between 2 parallel plates, after the charted loads have been applied. It will not exceed the values tabulated. Dimensions in millimeters: No
13、minal Size Tolerance Kg +/- 10% Up to 22 0.1 3 Over 22 Up to 39 0.15 4 Over 39 Up to 82 0.2 6 Over 82 Up to 150 0.25 10 Over 150 0.35 15 Spiral Flatness (Helix Pitch): Spiral flatness will be considered as the overall helical distortion of the ring as shown. It will not exceed 1.8 times the specifie
14、d maximum ring thickness. 5.0 MATERIAL AND HARDNESS: Spring steel SAE 1060 to 1090 processed to meet the specified hardness ranges and be capable of meeting the test requirements of the Bend and Fracture Test. Nominal Size Austempered Hardened and Tempered Up to 38 mm 49 to 54 Rc 47 to 52 Rc Over 38
15、 to 200 mm 46 to 51 Rc 44 to 49 Rc Over 200 mm 42 to 47 Rc 40 to 45 Rc NUMBER: MPAPS S-NM-5.101-GS/PL TITLE: Tapered and Reduced Cross Section (Circlip) Retaining Rings REVISION: 1501 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corpora
16、te Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JANUARY 2015 Page 3 of 6 6.0 FINISHES: Rings will be furnished plain or plated in accordance with the Navistar Engineering Materials Specification and class listed below: Plain (PLN). Zinc Trivalent
17、 (ZN6A) MPAPS G-20, Class 6A. Because electroplating of rings may be subjected to hydrogen embrittlement, the electroplating of rings is not recommended. 7.0 RESTRICTED CHEMICAL SUBSTANCES: Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the
18、 requirements of the MPAPS B-50 specification. 8.0 COLOR CODING: Not recommended, except in cases where adequate insurance is needed to prevent mixing of metric parts“ with look-alike “inch parts“. The color blue is standard identifier used in some industries. This must be handled internally at indi
19、vidual plants where needed and is meant to be supplemental to the normal finish and easily deleted when the need for supplemental identification no longer exists. The supplemental blue color should not be used on finishes such as chromium bright which are specified for cosmetic purposes, or phosphat
20、e coating which causes a loss of color identity. 9.0 METHOD OF DESIGNATION: Rings will be designated on purchase orders by size, thickness, ring type and style, and part number as shown in the following examples: 20 x 1.2 Reduced Cross Section, EXT-REG Retaining Ring, Part Number 30 x 1.5 Reduced Cr
21、oss Section, INT-HVY Retaining Ring, Part Number 8 x 1 Reduced Cross Section, EXT-E Retaining Ring, Part Number 10.0 PERFORMANCE REQUIREMENTS: Rings will be subjected to the following tests and meet the requirements specified. Permanent Set and Grip: Rings will grip freely on the groove diameter aft
22、er having been passed three times over a shaft (external type) or through a bore (internal type) which is the nominal diameter. The ring will be relaxed between each phase of the test. After each installation, the ring will be positioned vertically and will remain in position on the groove diameter
23、under its own weight. Provision will be made to ensure that throughout the test the ring is normal to the axis of the test shaft test line. Bend and Fracture Test: The ring will be positioned so that is is gripped across the beam section, as shown in Figure 1. The ring will then be bent through 30 d
24、egrees by repeated light hammer blows around a test block of radius equal to the maximum thickness of the ring. There will be no visible sign of fracture, cracks or similar defects. The ring will then be further bent until fracture occurs. An examination of the fracture will reveal a uniform grain s
25、tructure with no sign of laminations or other defects. NUMBER: MPAPS S-NM-5.101-GS/PL TITLE: Tapered and Reduced Cross Section (Circlip) Retaining Rings REVISION: 1501 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Sta
26、ndards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JANUARY 2015 Page 4 of 6 FIGURE I - BEND TEST Hardness Test: Both sides of samples will be free from scale and decarburization. The Rockwell C scale will be used on prepared samples having a thickness of 1.25 mm or
27、 greater. The Rockwell A scale or Rockwell superficial 45N, 30N or 15N scales will be used for prepared samples having a thickness less than 1.25 mm. Prepared samples will be sufficiently wide to prevent bulging of the sides by the penetrator or hardness tester. Prior to shipping, vendors will elimi
28、nate from shipments all rings which have been subjected to hardness indentation tests. 11.0 WORKMANSHIP: Rings will be free from sharp edges, burrs, loose scale, cracks, pits or other surface defects which might affect their serviceability. 12.0 POLICY FOR SELECTING PARTS FOR NEW DESIGN: Approved pa
29、rts are so designated to reduce 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. 13.0 PART LIST: 13.1 External Regular Type: 13.1.1 Approved: Navistar Part Number RING DIME
30、NSIONS GROOVE DIMENSIONS Axial Force KN* A B C D E F G H J J1K max min max approx max min min max min max min min min 934424R1 17 1 0.94 3.8 2.3 15.88 15.34 25.6 1.7 16.2 16.09 1.24 1.1 1.2 1.2 5.1 *The values listed give the fatigue strength (without safety margin) under pulsating stress or the ult
31、imate breaking strength with a safety factor of 3 to 4 under steady loading. NUMBER: MPAPS S-NM-5.101-GS/PL TITLE: Tapered and Reduced Cross Section (Circlip) Retaining Rings REVISION: 1501 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from C
32、orporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JANUARY 2015 Page 5 of 6 13.2 Internal Regular Type: 13.2.1 Approved: Navistar Part Number RING DIMENSIONS GROOVE DIMENSIONS Axial Force Kn * A B C D E F G H J J1K max min max approx max min m
33、in max min max min min min 933845R1 20 1 0.94 4.2 2.3 21.92 21.29 10.6 2 21.21 21 1.24 1.1 1.2 1.5 7.6 933167R1 42 1.75 1.69 5.9 4.1 46.28 45.11 29.2 2.5 44.75 44.5 1.99 1.85 2 3.8 41.7 * The values listed give the fatigue strength (without safety margin) under pulsating stress or the ultimate break
34、ing strength with a safety factor of 3 to 4 under steady loading. 13.3 External E Type: 13.3.1 Approved: Navistar Part Number RING DIMENSIONS GROOVE DIMENSIONS Axial Force N * A B C D E K min max nom max min max min max min max min min A min A max 933688R1 4 5 0.6 0.62 0.58 2.74 2.70 7 3.2 3.125 .0.
35、67 0.64 1 196 441 933699R1 5 7 0.7 0.72 0.68 3.388 3.34 9 4 3.925 0.77 0.74 1.2 294 637 934030R1 7 9 0.7 0.72 0.68 5.308 5.26 12 6 5.925 0.77 0.74 1.2 490 980 934451R1 9 12 1 1.03 0.97 6.578 6.52 16 8 7.91 1.11 1.05 1.8 686 1667 933700R1 16 24 1.5 1.53 1.47 12.68 12.61 29 15 14.89 1.61 1.55 3.0 1275
36、 2942 * The values shown are the allowed load in axial direction depending on the groove depth. They are valid for a shaft material with a tensile strength of 490 kPa and are based on the assumption of sharp edges at the groove base.The groove shoulders must be at right angles to the axis of the sha
37、ft. Higher loads may be applied for shaft materials of higher tensile strength. NUMBER: MPAPS S-NM-5.101-GS/PL TITLE: Tapered and Reduced Cross Section (Circlip) Retaining Rings REVISION: 1501 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission fro
38、m Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. JANUARY 2015 Page 6 of 6 14.0 TECHNICAL INFORMATION: 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:/
