Gear boxes and bridges

Mechanical and automated gearboxes
The Trakker range is equipped with gearboxes ZF 9S109 and 16S109 Ecomid to 9 and 16-speed cones Cursor 8 engines 270 and 310 hp; Ecosplit 16 S 151 with the Cursor 8-352 hp; Ecosplit 16 S 151 OD (overdrive) with the Cursor 13-380 hp; Ecosplit 16 S 181 OD with the Cursor 13 to 440 hp; Ecosplit 16S221 OD with the Cursor 13 engine with 480 hp. All gearboxes are equipped with 16-speed Servoshift assistance with pneumatic cylinder integrated in the gearbox cover. The effort added relationships is halved compared to a traditional mechanical control.

Why Choose Ecosplit gearboxes with the latest report overdrive (overdrive) with the Cursor 13 engine, rather than the direct drive like the road vehicles? Because the transmission elements are less stressed: in the lower ratios, the torque multiplication and tear due to changes in the grip of the tires are less pronounced. The final reduction is expected in the bridge double reduction.

The automated gearboxes EuroTronic 2, developed by Iveco and ZF, are available on request with the Cursor 8-310 hp and 352 hp version 12AS2301 DD, and the Cursor 13 in the version 12AS2601 OD, both with 12 gears. Some models 4x4 and 6x6 RHD propose the EuroTronic standard.
The speed changes EuroTronic 2 have a logic fully automatic gear change and a semi-automatic mode, in which the listing decision is up to the driver. The EuroTronic are without synchronizers, replaced by teeth of gear engagement. The clutch pedal has been deleted. The starting point is selecting a relationship and accelerating. A microprocessor pilot phase of the graft. In automatic mode, the gear shift is decided by an electronic control unit which takes into account engine speed, the available power, stress-resistant wheels and the position of the accelerator pedal. The synchronization of the speed of the gears via an electronic adaptation of the engine speed, much faster synchronization to friction. This solution is particularly appreciable in the pipeline, when the vehicle runs along an uphill, since the loss of speed is minimal. On the contrary, if the driver wishes to maintain the same ratio in a difficult passage, switches in semiautomatic mode. In this way, there will not be any inadvertent by automatism. The EuroTronic 2 man construction vehicles Iveco since 2001.

The bridges double reduction: a specialty Iveco
Iveco has always been a specialist of double reduction rear axles, bridges engine front and boxes of reference, which has decades of experience in the field. The double reduction of the bridges is formed by a total pinion / conical crowns, located in the central casing (ratio ranging from 1/1, 3 and 1/1, 5) and planetary gears places in the wheel hubs, with a constant ratio of 1/3, 2. This configuration has two advantages: the small diameter of the central ring limits the size of the housing and increases the height from the ground. Furthermore, since the gear ratio of the bridge takes place essentially in the hubs, the semi-shafts are less stressed during the tearing of the traction force. Even in this case, the robustness ensures a duration exemplary.
The back deck 451391, intended for 4x2 trucks, has a capacity of 13 t. The bridges of rear tandems mounted on 6x4, 6x6, 8x4 and 8x8 are of two types: for models "light", the bridges 452146 and 452191 have a capacity of 10.5 tonnes, equivalent to 21 tonnes for tandem for the heavier models, the 453291 rear axles have a capacity of 16 t or 32 t for the tandem. All bridges are equipped with a differential lock, the first axle of the tandem also has a longitudinal differential lock inter-bridges.
The bridge front engine type 5985, intended for the 4x4 and 6x6, as well as its special version reserved for the 8x8 model, have a capacity of 9 tonnes. They are fitted with the same gear hub ratio of 1/3, 2.

Bridges single reduction for cement mixers
The only vehicles that are fitted with a range Trakker a simple reduction are the 6x4 and 8x4 concrete mixer light range, used on roads or trails little bumpy. The bridge to simple reduction allows to reduce the tare weight, as well as the Cursor 8 engine and the frame side members with a 7.7 mm. The Bridges MT-150 are supplied by ArvinMeritor. They have a capacity of 10.5 tonnes, equivalent to 21 t for the tandem, and have inter-wheel differential locks and cross-bridges.