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. 2014 by Navistar, Inc. DECEMBER 2014 Page 1 of 11 NAVISTAR, INC. Material, Parts, and Process Specificati
2、ons (MPAPS) NUMBER: MPAPS P- 9534 Former Designation: TMS-9534 TITLE: Truck and Bus Seating Assembly Design, Performance, and Quality Requirements CURRENT REV No.: 1412 DATE: Dec. 2014 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: Rev. 1410 Oct. 2014 PRINTED
3、 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 hea
4、lth practices and to determine the applicability of regulatory limits prior to use. Change Notice: Added preload requirement in Section 4.3.10.1. 1.0 APPLICATION This specification covers requirements for the complete seat assembly and includes performance design criteria. 2.0 SCOPE This specificati
5、on covers the general, durability, performance, design, quality, qualification, shipping and identification, source approval and KCC requirements for truck and bus seat assemblies. Four service categories are covered: Medium Duty, Heavy Duty, Severe Service, and Bus passenger seats (Note: Bus driver
6、s seats are considered the same as Medium Duty). Requirements for individual materials used in the seat assembly are covered in separate specifications. 2.1 Restricted Chemical Substances Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the r
7、equirements of the MPAPS B-50 specification. 3.0 REFERENCE DOCUMENTS Unless otherwise specified the latest issue of all referenced standards shall apply. The following Specifications, Standards, and Regulations are referenced in this specification. Quality System Standard ISO 9001 or TS-16949 NAVIST
8、AR TMS-7116 FMVSS 207 Navistar Manufacturing Std. MS-D-13 NAVISTAR TMS-7121 FMVSS 210 NAVISTAR Engr Design Std. A-16 NAVISTAR TMS-7125 FMVSS 302 NAVISTAR MPAPS B-50 NAVISTAR TMS-7126 SAE J1051 NAVISTAR TMS-6501 NAVISTAR MPAPS G-9009 SAE J1454 NAVISTAR MPAPS L-6505 NAVISTAR MPAPS P-9543 SAE J826 NAVI
9、STAR TMS-7005 NAVISTAR TMS-9544 NAVISTAR TMS-7113 4.0 DESIGN REQUIREMENTS The seat assembly(ies) used in all NAVISTAR trucks is (are) expected to be sufficiently durable so as to provide a minimum of 10 years of service with one seat cover change. The design of the seat assembly (other than bus pass
10、enger seats) shall be sufficiently flexible/adjustable to provide for the anthropometric requirements of and provide full functionality for a customer base encompassing the fifth (5th) percentile female through the ninety-fifth (95th) percentile male. NUMBER: MPAPS P-9534 TITLE: Truck and Bus Seatin
11、g Assembly Design, Performance, and Quality Requirements REVISION: 1412 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. 2014 by Navistar, Inc. DECEMBER 2
12、014 Page 2 of 11 4.1 Anthropometric Data Anthropometric data for the 5th, 50th, and 95th percentile truck and bus drivers are shown in Tables 1 and 2, page 11. Use the data in Table 1 for Bus, Severe Service, Heavy Duty, and Regional Haul applications. Use the data in Table 2 for Medium Duty applica
13、tions and for bus passenger seats. (Given that current anthropometric data for U.S. children are not available, the data from the U.S. civilian population will be used as a conservative estimate.). 4.2 General Requirements The supplier of the seat assembly is responsible for the quality and durabili
14、ty of all materials and components used in the finished assembly. 4.2.1 Materials The materials used shall meet requirements of their respective specifications: 4.2.1.1 Upholstery Fabric TMS-7113 4.2.1.2 Injection Molded Trim Panels TMS-7116 4.2.1.3 Upholstery vinyl coated fabric and leather - TMS-7
15、121 4.2.1.4 Composite Trim Panels TMS-7125 4.2.1.5 Seat Back Carpet TMS-7126, Type A 4.2.1.6 Foam Padding TMS-6501, MPAPS L-6505 4.2.1.7 Thread TMS-7005 4.2.1.8 Other Materials - may be used by agreement between the supplier and purchaser. Bonded or laminated or dielectrically embossed composites ar
16、e covered by TMS-7028. 4.2.1.9 Painted Metallic Parts - unless otherwise specified, metallic components of the seat assembly shall be painted NAV0004 Black, Class IIIA, per MPAPS G-9009. 4.2.2 Flammability Resistance: TMS-9544 (FMVSS 302) Material supplied to this specification shall meet all requir
17、ements of TMS-9544 and the latest issue of Federal Motor Vehicle Safety Standard #302 Flammability of Interior Materials. The supplier shall provide certification of compliance in accordance with requirements of MPAPS P-9543. 4.3 Durability Requirements These requirements are guidelines for setting
18、each test. When new vehicles or applications are developed (or current ones significantly modified), the test conditions should be studied to evaluate their effectiveness in testing the seat assembly to that application. In many situations, test parameters may be modified (with guidance and approval
19、 from engineering) to better simulate how the product will be used. Such changes or modifications shall be documented in writing and reported completely on the test report. 4.3.1 Seat Cushion Squirm Test 4.3.1.1 Procedure: Equipment, set up and procedure shall be per SAE J1454, Dynamic Durability Te
20、sting of Seat Cushions for Off-Road Work Machines, with the exceptions indicated below. 4.3.1.1.1 Inspect and replace cotton duck in the saddle test as required. NUMBER: MPAPS P-9534 TITLE: Truck and Bus Seating Assembly Design, Performance, and Quality Requirements REVISION: 1412 This document is r
21、estricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2014 by Navistar, Inc. DECEMBER 2014 Page 3 of 11 MEDIUM DUTY HEAVY DUTY SEVERE SERVICE BUS PASSENGER Saddle, Test Weight l
22、bs 207 207 207 183 Newtons 921 921 921 814 Cycles 20,000 50,000 35,000 20,000 Rate cycles/min 4 4 10 4 Rotation degrees 21 21 30 21 4.3.1.2 Required: Seat shall complete the specified cycles without fracture of the frame, spring or spring elements, deterioration of the padding or cover, or general d
23、egradation of the appearance or function of the seat which would make it unacceptable for customer use. Report per SAE J1454. 4.3.2 Seat Back Folding Durability 4.3.2.1 Procedure: The seatback shall be disengaged, the seat back articulated through its full range of motion and returned to its upright
24、 and locked position. The cycle shall be repeated 25,000 times at not more than 20 cycles/minute. 4.3.2.2 Required: The lock assembly shall complete the specified cycles with no loss of functionality, excessive wear or general degradation of the appearance or function of the seat that would make it
25、unacceptable for customer use. 4.3.3 Seat Cushion Fatigue (Jounce) 4.3.3.1 Procedure: Set up as per SAE J1454 for jounce, with the following exceptions: MEDIUM DUTY HEAVY DUTY SEVERE SERVICE BUS PASSENGER Saddle Weight lbs 312 312 312 263 Newton 1388 1388 1388 1170 Jounce Cycles 200,000 500,000 200,
26、000 200,000 Rate, cycles/ min 100 100 100 100 4.3.3.2 Required: Seat shall complete the specified cycles without fracture of the frame, spring or spring elements, deterioration of the padding or cover, or general degradation of the appearance or function of the seat which would make it unacceptable
27、for customer use. Report per SAE J1454. 4.3.4 Ingress/Egress 4.3.4.1 Procedure: The saddle shall be a Burke Porter buttock form or equivalent and shall approach the seat horizontally at 60 degrees to the longitudinal centerline of the seat at a rate of 6 cycles/minute. Cooling of the seat assembly b
28、y fan during tests is acceptable. The saddle shall be a Burke Porter buttock form or equivalent and shall initiate from a static position in the center of the seat with the correct saddle weight applied. From this position the Burke Porter buttock form or equivalent shall slide horizontally (no vert
29、ical movement in the positive direction) to collapse/flatten the outboard bolster of the seat cushion at a rate of 6 cycles/minute. Cooling of the seat assembly by fan during tests is acceptable. NUMBER: MPAPS P-9534 TITLE: Truck and Bus Seating Assembly Design, Performance, and Quality Requirements
30、 REVISION: 1412 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. 2014 by Navistar, Inc. DECEMBER 2014 Page 4 of 11 MEDIUM DUTY HEAVY DUTY SEVERE SERVICE B
31、US PASSENGER Cycles 30,000 30,000 30,000 30,000 Saddle Weight lbs 100 150 150 100 Newton 445 667 667 445 4.3.4.2 Required: Seat shall complete the specified cycles without fracture of the frame, spring or spring elements, deterioration of the padding or cover, or general degradation of the appearanc
32、e or function which would make it unacceptable for customer use. 4.3.5 Seat Back Rearward Fatigue Cycle 4.3.5.1 Procedure: The seat frame assembly is to be tested as a complete seat frame assembly including risers and the seat is to be tested in the rear most position with a new seat frame for each
33、test position. The complete seat frame assembly is to be rigidly attached to the test fixture. A rigid bar is to attached to the seat back frame 305 mm (12 in.) above the H-point. The load cylinder is to be attached using a U-joint at the cylinder attachment. Perform 25,000 rearward cycles at 20-30
34、cycles/minute with a load of 230 lbs. (1023N), regardless of seat type, to the upper most seat back structure. 4.3.5.2 Required: No more than a 2 degree set per 1000 cycles and 6 degree set overall in the back frame. The frame assembly must sustain the specified load cycle without structural collaps
35、e and must not exhibit any weld or fatigue cracks. The system with adjusters and/or risers must meet the same requirements as the frame assembly. All mechanisms must be functional after testing. 4.3.6 Torsional Strength and Rigidity 4.3.6.1 Procedure: Apply a 150 lb (667N) rearward load to the upper
36、 corner of the free pivot side (non locking side) of the seat back at a rate of 300lb/second and hold for 10 seconds. This test is to be performed only on a seat with a single sided recliner. 4.3.6.2 Required: No more than 7.6 mm set at the point of loading. 4.3.7 Seat Back Ultimate Rearward Load 4.
37、3.7.1 Procedure: The seat frame assembly (cushion, back frames and attaching means assembled and attached as a system) is to be rigidly attached to the test fixture at the cushion attachment points (no adjusters and risers required). A rigid bar is to be attached to the seat back frame 305mm (12 in.
38、) above the H-point. The load cylinder is to be attached using a U-joint at the cylinder attachment. Apply a 263 lb. (1170N) load, regardless of seat type, simultaneously through the vertical planes of the H-points. Attaching fasteners must meet design intent. 4.3.7.2 Required: No more than 7.6 mm (
39、0.3 in.) set measured at the same point of load on the seat back, or general degradation of the appearance or function of the seat that would make it unacceptable for customer use. 4.3.8 Impact on Seat Cushion 4.3.8.1 Procedure: Drop a Burke Porter buttock form loaded to 263 lbs (1170N) from a heigh
40、t of 6 inches (152 mm) onto a fully trimmed seat at -30 C and 80 C. The H-point plane of the Burke Porter NUMBER: MPAPS P-9534 TITLE: Truck and Bus Seating Assembly Design, Performance, and Quality Requirements REVISION: 1412 This document is restricted and may not be sent outside Navistar, Inc. or
41、reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2014 by Navistar, Inc. DECEMBER 2014 Page 5 of 11 buttock form and the H-point plane of the seat are to coincide before the drop. Condition material for 4 hours at 40-90% relative
42、 humidity prior to testing. 4.3.8.2 Required: There shall be no damage which would interfere with the normal operation of the seat or its features. 4.3.9 Impact on Seat Back 4.3.9.1 Procedure: Drop a Burke Porter back form loaded to 150 lbs (667N) onto a fully trimmed seat from a height of 12 inches
43、 (305 mm) at -30 C (-22 F) and 80 C (176 F). The load is to be applied perpendicular to the seat back with the H-point plane of the Burke Porter back form and the H-point plane of the seat coinciding before the drop. Condition material for 4 hours at 40-90% relative humidity prior testing. 4.3.9.2 R
44、equired: There shall be no damage which would interfere with the normal operation of the seat or general degradation of the appearance of the seat that would make it unacceptable for customer use. 4.3.10 Crossbar Vertical Load 4.3.10.1 Procedure: The seat frame assembly with adjusters and risers is
45、to be rigidly attached with design intent fasteners to the test fixture. First, apply a 50-lb pre-load. Then, apply a 263 lb. (1170N) load at mid-span of the forward most transverse cross member in the vertical direction at a maximum rate of 300 lb/second and hold for 10 seconds. Additionally, for a
46、 two-man bench seat apply two 263 lb. (1170N) loads simultaneously in a vertical direction on the forward most transverse cross member in the vertical planes of the H-points at a maximum rate of 300 lb./second and hold for 10 seconds. And for a three-man bench seat, apply three 263 lb. (1170N) loads
47、 simultaneously in a vertical direction on the forward most transverse cross member in the vertical planes of the H-points at a maximum rate of 300 lb./second and hold for 10 seconds. 4.3.10.2 Required: For the single center load, no more than 2.5 mm deflection for split and bucket seats, 7 mm defle
48、ction for a two-man bench seat and 9 mm deflection for a three-man bench seat. For the multiple simultaneously applied loads, no measurable permanent set after removal of the load is permissible. Ten percent hysteresis is permissible. 4.3.11 Seat Cushion Force Deflection 4.3.11.1 Procedure: SAE J105
49、1 4.3.11.2 Required: 10% of originally qualified material. 4.3.12 H-point Verification Test 4.3.12.1 Procedure: The H-point is to be verified using SAE J826 with a tolerance of 12.7 mm in all directions (X,Y, no parts should fall off or become loose after testing. 4.3.14 NVH-Buzz, Squeak and Rattle (BSR) Test 4.3.14.1 Procedure: Validation tests for seat assembly BSR use an electromagnetic shaker, ideally completed in a semi-anecho
