SAE J636 pdf download
SAE J636 pdf download.v-Belts and Pulleys.
1. This specification covers standard dimensions, tolerances, and methods of measurement of Vbelts and pulleys for automotive V-belt drives.
2. References—There are no referenced publications specified herein.
3. V-Belt Types—Automotive V-belts are produced in a variety of constructions in a basic trapezoidal shape. The inside circumference of the V-bell can be a plain straight line or corrugated by means of cogs or notches for the purpose of increasing the belt(s) flexibility for use with puleys in the lower proposed diameter. Belts are to be dimensioned in such a way that they are functional in pulleys dimensioned as descred in subsequent sections.
4. Pulleys—Pulleys are to conform to requirements of Figure 1 and Tables 1A, 1B, 2A, and 28.
5.1 Length—To measure the length, the belt is placed on the measuring fixture at the force shown in Tables 3A and 3B, and rotated around the pulleys at least two revolutions of the belt to seat the belt properly in the pulley grooves and to d,vide the total force equally between the two strands of the belt. The mid-point of the center distance travel of the movable pulley defines the center distance and will be measured through one revolution of the belt minimum after the two seating revolutions. The belt effective length is equal to two times the center distance plus the effective pulley circumference. Standard belt center distance tolerances are shown in Tables 4Aand 4B.
