Belt Tension Adjuster

BELT TENSION ADJUSTER
The belt tension adjuster provides a constant value of tension for the timing belt. Proper belt tension is maintained using a rod of tension adjuster to push the timing belt via tensioner pulley.
The location of the tensioner pulley shaft center is offset in relation to the center of the pulley's outside diameter.
The tensioner adjuster rod provides a rotary movement for the tensioner pulley by both tension of the spring housed in the adjuster.
1) Belt tension action
The tensioner adjuster rod (3) is moved to the left by the force of the main spring (6). This causes silicone oil (which is held to constant pressure by compression-spring tension inside the reservoir chamber (9)) to push the check ball (5) so that silicone oil flows into the oil pressure chamber (8). The momentum which forces the adjuster rod out acts upon the tensioner arm (2) so that the pulley is turned counterclockwise. Thus, timing belt tension is properly maintained.
2) Balance to belt tension
When the timing belt reaction force is balanced by the main spring tension (to push the adjuster rod), the arm is held stationary to maintain constant belt tension.
When the timing belt reaction force increases to such an extent that the belt will be too tight, a small quantity of oil in the oil pressure chamber (8) gradually returns to the reservoir chamber (9) via the adjuster body-to-rod clearance. This return of oil continually moves the rod until the reaction force of the timing belt balances with main spring force and oil pressure inside the oil pressure chamber. Thus, belt tension is constantly maintained.