A HERTH+BUSS JAKOPARTS brand Tensioner Pulley, timing belt is a part of the timing belt drive, which serves to bypass the belt in a certain place or several places and is a freely rotating pulley of small diameter.

The composition of the roller is small: it is the roller mount, the internal rolling bearing with a protective oil seal, and the working body of the roller itself, which is in contact with the belt.

1. HARRIER (_U3_)
2. CAMRY Saloon (_V3_)
3. RX (_U3_)
4. PREVIA (_R3_)
5. TARAGO (_R3_)
6. PREVIA / ESTIMA (_R3_)
7. ESTIMA (_R3_)
8. ALPHARD (_H1_)
9. SOLARA Coupe (_V3_)
10. SOLARA Convertible (_V3_)
11. WINDOM (_V3_)
12. HIGHLANDER / KLUGER (_U2_)
13. KLUGER (_U2_)
14. SIENNA (_L2_)
15. ES (MCV_, VZV_)
16. ES Saloon (MCV_, VZV_)
17. See more in applications

The principles of the timing belt tensioner work

Excessive tension leads to intensive wear of the timing parts - pulley bearings (water pump, generator, tensioner, etc.), the belt itself, and others. In addition, a tight belt stretches faster and shortens its service life. Too little preload is fraught with more serious problems - slipping of the belt along the toothed pulleys of the camshafts, which leads to a violation of the valve timing and deterioration of the entire engine.

Therefore, a tensioning device is introduced into the timing drive in the form of rollers of one design or another, which, during engine operation, maintain an optimal belt tension.