1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards THE TEST PROCEDURE OF BACKWARD STRENGTH FOR HEADREST Do Not Use on New Programs. Being Replaced by GMW14606 EDS-T-4518 ISSUED DATE: 1998. 02. 26 REVISED DATE: 2008. 10. 15 VERSION: 3 (Superceded) EDS-T-4518THE TEST PR
2、OCEDURE OF BACKWARD STRENGTH FOR HEADREST PAGE: 1/2 ISSUED DATE: 1998. 02. 26 REVISED DATE: 2008. 10. 15 VERSION: 3 GM DAEWOO Auto & Technology Note: This standard may be applied only for current project (incl. T255 Program). It is Superceded for all future projects and replaced by GMW14606. 1. PURP
3、OSE This procedure verifies the strength of the backward strength on the headrest fixture. 2. SCOPE All types of passenger car seats mounted with headsets 3. TEST SAMPLES Minimum three new headsets and fixtures respectively 4. TEST EQUIPMENT AND JIG 4.1. Jig for fitting a seat back frame 4.2. Leveli
4、ng surface table 4.3. Measuring instruments for loads and length The measuring instruments shall be capable of measuring the load and the length displacement with maximum resolution of 0.5 kgf and 0.5 mm respectively. 4.4. Weight loading equipment Equipment capable of loading the weight greater than
5、 68 kgf 4.5. Recorder A recorder capable of recording the load and the displacement in load vs. displacement graphs 4.6. Weight loading jig A 50 mm wide square plate longer than the headset 5. METHODS AND SPECIFICATIONS OF TEST 5.1. Preparation 5.1.1. Fit the seat back frame-fixing jig on the leveli
6、ng surface table, and then mount a headrest on the jig. 5.1.2. Set the headrest at the uppermost position. 5.2. Test Method 5.2.1. Load the weight on the sleeve 63.5 mm down the uppermost position of the headrest in vertical direction as EDS-T-4518THE TEST PROCEDURE OF BACKWARD STRENGTH FOR HEADREST
7、 PAGE: 2/2 ISSUED DATE: 1998. 02. 26 REVISED DATE: 2008. 10. 15 VERSION: 3 GM DAEWOO Auto & Technology described in item 5.2.2 as shown in fig. 1, and measure the displacement at the weight loading point. 5.2.2. Load the initial weight of 4 kgf to measure the initial transformation, and then load th
8、e weight of 68 kgf to measure the maximum transformation. Remove the load and load the initial weight of 4 kgf again to measure the permanent transformation. 5.3. Evaluation 5.3.1. The maximum transformation shall be smaller than 130 mm. 5.3.2. The permanent transformation shall be smaller than 60 mm. 5.3.3. Any structure shall be free of damage. Figure 1
