Vehicles With: IB5/Manual Transaxle

Manual Transaxle








General view
The iB5 manual transaxle in the vehicle is a"2-shaft transaxle" which has been revised to include a cable operating mechanism for the first time.
The aluminum transaxle housing comprises two sections. Its rigidity has been improved with the inclusion of reinforcement ribbing in the design.
The transaxle housing sections come in pairs and cannot be obtained separately. The clutch is hydraulically actuated.
All the gears in the "2-shaft transaxle" are constant mesh gears (except reverse gear). In each gear, the required transaxle ratio is achieved by means of a pair of gear wheels.
When reverse gear is selected, the direction of rotation of the output shaft, is changed by an idler gear.
The gears are all helical gears (except reverse gear). They all have synchronizers (except reverse gear) and run on plain bearings.
First and second gears have dual synchronizers.
The iB5 manual transaxle is filled with 2.3 liters of synthetic fluid, specification WSD-M2C200-C. The fill height is 5 to 10 mm below the lower edge of the check hole. Fluid changes are not necessary.

iB5 Manual Transaxle Components











General view














Internal shift mechanism
In neutral, no gear is connected to the output shaft via the gear synchronizers. No input torque is transmitted to the differential.








Input shaft

DESCRIPTION AND OPERATION











Output shaft











Dual synchronizer
First and second gear, have dual synchronizers. The use of a second synchronizer ring means that the effective synchronization area is increased approximately 100 % in relation to single synchronizers.
Dual synchronization gives considerable improvement in gearshift quality.
The dual synchronizers consist of inner synchronizer ring, cone ring, outer synchronizer ring and synchronizer assembly.
The conical surface on the gear wheel is discontinued. Synchronization occurs through both synchronizer rings and the cone ring, which is, positively fitted to the gear wheel.

Differential
Major components of the differential include:
- Spur gear
- Differential housing with two taper roller bearings
- Differential pinions
- Input shaft pinions
The transaxle and differential are housed in a two section aluminum housing and flange-mounted to the engine. The input shafts have splines. The input torque is transmitted to the differential via a spur gear, which is bolted to the differential cage. The differential cage contains the differential pinions mounted on one pin as well as the front halfshaft pinions connected to the front drive shafts through the splines. If the front wheels are traveling at different speeds (when cornering), the front halfshaft pinions can move on the differential pinions.

Power flow

Neutral:

Neutral








First gear





Second gear








Third gear

Fourth Gear:

Fourth gear

Fifth Gear:

Fifth gear








Reverse gear

The reverse idler gear is driven off the input shaft. Its purpose is to change the direction of rotation of the output shaft when reverse gear is selected.
The reverse idler gear runs in a plain bearing on the idler gear shaft and a bearing block.
The selector interlock mechanism and the selector finger are mounted on a sleeve in the selector mechanism housing. They hold the selected gear by means of a spring-loaded ball until a different gear is selected.
The selector interlock mechanism has three different positions.