Improved engine brake device

Abstract

The invention relates to an engine brake device which comprises an exhaust valve control mechanism. The exhaust valve control mechanism comprises a driving force input cam, a cam driven wheel, a push rod, a rocker arm and a rocker arm shaft, wherein one end of the push rod is connected with one end of the rocker arm, the cam driven wheel is arranged on the other end of the push rod, and the driving force input cam is arranged outside the cam driven wheel; the other end of the rocker arm is provided with a horizontal guide piston, a driving piston and a vertical brake plunger piston, two connecting rods are arranged in the guide piston, the convex spherical surface of the upper end of the upper connecting rod is matched with the concave spherical surface of the rocker arm, the convex spherical surface of the lower end of the lower connecting rod is matched with the convex spherical surface of the brake plunger piston, and an exhaust valve rod connecting piece is arranged below the brake plunger piston. The driving force input cam periodically transmits engine power to the rocker arm, the gap between the rocker arm and the exhaust valve rod connecting piece is controlled by using a solenoid valve, the switching between the brake working state and the normal working state is realized, the size and the weight of the brake are reduced, and high oil pressure and leakage, deformationand load fluctuation caused by high oil pressure do not occur.

Description

Technical field: [0001] The invention relates to the mechanical field, in particular to an engine braking device, in particular to an improved engine braking device. Background technique: [0002] In the prior art, the method of using the internal combustion engine as a braking means is well known, and only the engine needs to be temporarily converted into a compressor. This conversion cuts off the fuel and opens the exhaust valve at or near the end of the engine piston compression stroke, allowing the compressed gas (air during braking) to be released. The energy absorbed by the engine during the compression stroke cannot be used The subsequent expansion stroke returns to the engine piston, but is dissipated through the engine's exhaust and cooling system. The end result is effective engine braking that slows the vehicle. [0003] A precedent for an engine brake is disclosed in US Patent No. 3,220,392 to Cummins, according to which an engine braking system has been manufa...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of improved engine braking device, and described this improved engine braking device will solve the technology that the overhead mode of engine braking system in the prior art increases the height of engine and the technology of manufacturing cost At the same time, it is necessary to solve the technical problems of large inertia and slow response of the braking system existing in the hydraulically driven engine brake

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