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.