125000329 - 2110B MANUAL GEARBOX WITH DIFFERENTIAL GEARS AND SYNCHRONISERS

COMPONENT DESCRIPTION

MAIN SHAFT

Specifications

Specific features of the systemThe main shaft is supported by means of two high precision conical bearings.The main shaft (1) rear bearing has a Viton seal (2) which compensates for axial thermal expansion of the gearbox casing and the main shaft.

The seal makes it possible to:

• reduce the wear of the synchronizers;
• improve the matching of the gears;
• reduce the noise from the bearings;
• improve the manoeuvrability of the gearbox.

Composition

Structure

The main shaft consists of:

• 1^st , Reverse and 2^nd speed gears;
• 3^rd , 4^th , 5^th /6^th speed gears, fitted on needle bearings with the synchronizers

LAYSHAFT

Composition

Structure

The layshaft consists of:

• 1^st and 2^nd speed gears, fitted on needle bearings with synchronizers
• 3^rd , 4^th and 5^th /6^th speed gears fitted on the shaft.

The layshaft is supported by means of two high precision conical bearings.

GEARS

Specifications

Specific features of the system

All the gears have been designed with ''high cover factor'' teeth, i.e. when one of the matching teeth is in contact, the next tooth has already started meshing which has the advantage of:

• reducing transmission irregularities;
• reducing operating noise.

The teeth on the gears for 2^ndspeed, 5^th-6^thspeed and the final drive have been ''super-finished'' after the heat treatment.Type

The gears are the following type:

• helical toothed for the forward speeds;
• straight toothed for Reverse.

SYNCHRONIZERS

Specifications

Type

The synchronizers for all the gears are brass, baulk ring ''Borg-Warner'' of the following type:

• triple cone (1) for 1^st and 2^nd speeds;
• double cone (2) for 3^rd speed;
• single cone (3) for 4^th and 5^th /6^th speed

Multiple cone synchronizers make it possible to:

• distribute the lever engagement load over several cones;
• facilitate the engagement of the gears.

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