LHB COACH : : Curve roll and Restrictor
Indian Railways
Curve Rolls are components located at the two outer corners of the bogie frame. In LHB coaches, there are typically two curve rolls per bogie, totaling four per coach. Specifically, they are positioned at the front of the leading trolley and the back of the trailing trolley.
Their primary function is to manage the forces generated during the coach's movement through curves. As the train negotiates a curve, the body tends to lean towards the outer side of the curve due to centrifugal forces. Curve rolls help counteract this tendency by providing support and stability to the coach, minimizing excessive tilting or leaning.
Restrictors are complementary components provided in the front and back of the coach body. In LHB coaches, there are typically four restrictors per coach. Restrictors work in tandem with curve rolls to restrict excessive relative rotation between the coach and the bogie. They help maintain the alignment and stability of the coach with respect to the bogie, especially during angular movements such as negotiating steep curves.
Curve rolls and restrictors collaborate to ensure the safety and stability of the coach during various operational conditions, particularly on steep curves where the risk of excessive tilting or rotation is higher. By working together, they help maintain the desired orientation and alignment of the coach relative to the bogie, enhancing the overall performance and safety of the train.
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