Nissan Versa (N17): Structure and operation

Sectional View

1. Clutch housing 2. 1st-2nd synchronizer hub assembly 3. 3rd-4th synchronizer hub assembly 4. 5th input gear 5. 5th-reverse synchronizer hub assembly 6. 5th-reverse baulk ring 7. 5th main gear 8. 4th main gear 9. 3rd main gear 10. 2nd main gear 11. 2nd double-cone synchronizer 12. 1st double-cone synchronizer 13. 1st main gear 14. Differential side bearing 15. Differential 16. Final gear 17. Mainshaft 18. Input shaft

System Description

DOUBLE-CONE SYNCHRONIZER

Double-cone synchronizers are adopted for 1st and 2nd gears to reduce operating force of the shift selector.

(1) : Outer baulk ring

(2) : 2nd main gear

(3) : Synchronizer cone

(4) : Inner baulk ring

(5) : 1st main gear

(6) : 1st-2nd coupling sleeve

REVERSE GEAR NOISE PREVENTION FUNCTION (REVERSE BRAKE)

Description

Soon after the clutch is disengaged, the input shaft is still rotating due to inertia. This may cause a gear noise when the shift selector is moved to reverse position. The reverse gear noise prevention function stops the rotation of the input shaft and enables smooth gear shifting when the reverse gear is selected.

Operation Principle

1. When the shift selector is moved to reverse position, 5th-reverse coupling sleeve (1) slides in the reverse direction. ( )
2. Synchronizer levers (2) with support point (A) at 5th-reverse synchronizer hub (3) presses 5th-reverse baulk ring (4). ( )
3. Friction that is generated at 5-reverse baulk ring presses synchronizer lever on 5th-reverse coupling sleeve. ( )
4. 5th-reverse coupling sleeve that is pressed by synchronizer lever stops the rotation of input shaft.

            (5) : 5th input gear