1、FORD LABORATORY TEST METHOD BP 111-01 TOOTH SHEAR RESISTANCE OF TOOTHED DRIVE BELTS Application This test determines the resistance to shearing of the fabric covered molded rubber teeth of toothed drive belts. Apparatus Test Fixture - see Figure 1 Ring Nut Screw Index Tabs Spacer Bar Slide Plate Bea
2、ring Wheel Toothed Pulley Spring“ Item 1 Item 2 Item 3 Item 4 Item 5 Item 6 Item 7 Item 8 “Spring characteristics: Max Load 17.0 kg Wire Dia 2.5 mm I .D. 15 mm O.D. 20 mm Pitch 5.5 Source: Materials Laboratory 13/1 O0 Ford Motor Company Ltd. Research & Engineering Centre Laindon, Basildan, Essex SS1
3、5 6EE England Tensile Testing Machine Capable of a constant jaw separation of 50 mm/minute, and fitted with an autographic recorder of load and cross-head displacement. I Date I Action I Revisions I I 2001 O9 12 I Revised I Editorial - no technical change A. Cockman I 1990 02 27 I Copynght02001, For
4、d Global Technologies, Inc FORD LABORATORY TEST METHOD BP 111-01 Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 OC and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the
5、 same conditions unless otherwise specified. Procedure 1. 2. 3. 4. 5. 6. 7. Cut a 250 mm length of belt aged according to the relevant Engineering Material Specification. Fit the toothed pulley specified in the Engineering Material Specification onto the slide plate (Item 5) and lock in place. Loose
6、n the screw and ring nut and insert the FIFTH tooth from one end of the cut belt into the pulley groove so that the remainder of the belt hangs below the fixture. Insert the slide plate between the neck of the belt and the bearing wheel. Tighten the screw until the index tabs just grip the spacer ba
7、r, then lock the ring nut. Suspend the fixture from the top clamp of the Tensile Testing Machine and grip the free end of the belt in the lower clamp. Pull the belt at a rate of 50 mm/minute in order to shear the tooth engaged in the pulley from the belt. Continuously record the force/displacement c
8、urve on the autographic recorder. Repeat the test on a minimum of 4 sample belts. Evaluation The tooth shear load shall be evaluated as the arithmetic mean of the maximum load value obtained for each of a minimum of five test results. The results obtained for teeth pulling over the pulley tooth with
9、out shearing shall be accepted providing the value is greater than the specified minimum. If the value without shearing is below the specified minimum then the test shall be repeated one more time on another test piece. This value shall be accepted whether the tooth shears or not. Chemicals, materia
10、ls, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities. Page 2 of 3 Copynght02001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD BP 111-01 TOOTH SHEAR RESISTANCE OF TOOTHED DRIVE BELTS Page 3 of 3 Copynght02001, Ford Global Technologies, Inc
