Engine Exhaust Brake Butterfly Valve

Abstract

The invention discloses an engine exhaust brake butterfly valve which comprises a valve body, a rotary shaft, a valve plate and a power mechanism. The valve plate is fixed in an inner cavity of the valve body through the rotary shaft, the valve plate is connected with the power mechanism, the power mechanism drives the valve plate to overturn in the inner cavity with the rotary shaft as a center, and when the valve plate is closed, the inner cavity is divided into an air inlet cavity and an exhaust cavity. A seal ring is fixed to the valve plate and used for being connected with the wall of the inner cavity in a sealing mode. The seal surface between the seal ring and the wall of the inner cavity is staggered by a hollow part on the seal ring. According to the engine exhaust brake butterfly valve, the seal surface is arranged in a staggered mode through the hollow part which is arranged on the seal ring and does not make contact with the wall of the air inlet cavity, on the premise that the seal ring is sufficient in width, the contact area between the seal ring and the wall of the inner cavity is reduced, the seal ring is easy to extrude and deform so that the operation torque when the valve plate is opened or closed can be reduced, energy losses of an engine are reduced, flexibility of opening and closing the valve plate is guaranteed, and it is guaranteed that the engine exhaust brake function is performed normally.

Description

technical field [0001] The invention relates to an engine component, in particular to an engine exhaust brake butterfly valve. Background technique [0002] With the increasing requirements of commercial vehicles on the braking system, only relying on upgrading the traditional braking system can no longer fully meet the needs of customers, so auxiliary braking has emerged as the times require, although the auxiliary braking cannot reach the main braking system Such a large braking force is output, but when the vehicle needs to decelerate during driving, the use of auxiliary braking not only reduces the wear of the friction lining, but also has the effect of braking and decelerating. Exhaust brake is a kind of deceleration brake that assists the braking effect of the vehicle. It has a simple structure and low price, and is widely used in trucks or buses equipped with diesel engines. The exhaust brake system usually installs an exhaust brake butterfly valve at the exhaust pip...

AI Technical Summary

Problems solved by technology

However, the sealing ring of this structure has poor elasticity, and the sealing ring and the inner cavity are pressure-forced seals, so the operating torque when the valve is opened and closed is relatively large, which increases the energy loss of the engine and also affects the opening and closing of the valve. flexibility

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