1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards DURABILITY OF NEEDLE BEARING CRANKSHAFT/INPUT SHAFT FWD AND RWD EDS-T-2217 ISSUED DATE: 1996. 07. 10 REVISED DATE: 2006. 06. 19 VERSION: 3 EDS-T-2217DURABILITY OF NEEDLE BEARING CRANKSHAFT/INPUT SHAFT FWD AND RWD PAGE
2、: 1/3 ISSUED DATE: 1996. 07. 10 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 1. PURPOSE This standard evaluates the durability of the needle bearing in the crankshaft, for RWD/FWD manual transmissions. 2. SCOPE This standard shall be only applied to the needle bearing used for m
3、anual transmission in automobile. 3. EQUIPMENT 3.1. FWD needle bearing test stand (See Fig. 1) 3.2. RWD needle bearing test stand (See Fig. 2) 4. PREPARATION 4.1. Install the needle bearing to be tested in the holding fixture, with the press-in force specified in the drawing. 4.2. For monitoring the
4、 temperature of the needle bearing, install a thermocouple at the fixed outer ring. 4.3. Install holding fixture with needle bearing in the test stand, in vehicle ASM, condition. 4.4. The speed of the input shaft journal is 6,000 rpm. It is adjusted by using the appropriate ratios of transmissions 1
5、 and 2. 4.5. Adjust the test temperature of the bearing to +1355 using a suitable hot air blower. 4.6. The needle bearing temperature will be monitored by a temperature recorder. When exceeding the temperature limit of +160, the test stand will stop. 5. PROCEDURE 5.1. Accelerate the input shaft from
6、 0 to 6,000 rpm within 1.3 seconds (by engaging clutch 1 while clutch 2 remains disengaged). 5.2. For about 4 seconds the speed of the input shaft is 6,000 rpm. 5.3. Decelerate the input shaft from 6,000 rpm to 0 within 1 sec. (by disengaging clutch 1 and engaging clutch 2). 5.4. After a pause of 3.
7、5 seconds the next cycle will start as described clause 5.1 5.5. The test will be concluded as soon as, A the specified cycles are reached, or B the temperature of the fixed outer ring of the bearing exceeds the temperature limit of +160, we know from experience that the bearing is EDS-T-2217DURABIL
8、ITY OF NEEDLE BEARING CRANKSHAFT/INPUT SHAFT FWD AND RWD PAGE: 2/3 ISSUED DATE: 1996. 07. 10 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology defective in such case. 6. BOGY 6.1. At least 6 needle bearings shall be tested. 6.2. The number of cycles specified is 40,000 cycles. 7. EVA
9、LUATION After having reached the number of cycles specified, bearings and input shaft journal must not expose pitting, plastic deformation, or frictional corrosion. Also the amount of grease in the bearings must still be sufficient. Fig. 1. Test Stand Needle Bearing FWD EDS-T-2217DURABILITY OF NEEDLE BEARING CRANKSHAFT/INPUT SHAFT FWD AND RWD PAGE: 3/3 ISSUED DATE: 1996. 07. 10 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology Fig. 2. Test Stand Needle Bearing RWD Fig. 3. Speed Curve Needle Bearing Journal Input Shaft
