Manual Transaxle

Manual Transaxle

General View









The IB5 transaxle has an aluminum transaxle housing which comprises of 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 are constant mesh gears (except reverse gear). In each gear, the required transaxle ratio is achieved by means of a pair of gears.

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.

IB5 Manual Transaxle Components

General View









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

Selector Mechanism










Input Shaft










Output Shaft










Dual Synchronizer









Dual Synchronizer

First and second gear have dual synchronizers. The use of a second synchronizer ring means that the effective synchronization area is increased approximate. 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:

- Differential ring gear

- Differential housing with two taper roller bearings

- Differential pinion gears

- Input shaft pinion gears

The transaxle and differential are housed in a two-section aluminum housing and flange-mounted to the engine.

The input torque is transmitted to the differential via a ring gear which is bolted to the differential case.

The differential case 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 travelling at different speeds (when cornering), the front halfshaft pinions can move on the differential pinions.

Power Flow

Neutral










First Gear










Second Gear










Third Gear










Fourth 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 transaxle 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.