Compression braking device of four-stroke cycle internal combustion engine

Abstract

The invention provides a compression braking device of a four-stroke cycle internal combustion engine. A control valve mechanism (13) and a clearance compensation mechanism (23) with the compensated clearance being the lift range of a braking projection are installed in parallel on one end of an amounting elephant feet of a rocker (3); a clearance compensation mechanism (11) with the compensated clearance being the lift range of a valve clearance is arranged in the midpoint of the connecting positions of an exhaust valve bridge (5) and two exhaust valves (6); the elephant feet (24) are coaxially connected below the lower end of the previous clearance compensation mechanism (23); the upper end of the next clearance compensation mechanism (11) is always in contact with the lower ends of the elephant feet; and the spring force of the clearance compensation mechanism is smaller than braking oil pressure and larger than dead weight of the elephant feet. Compared with the prior art, the compression braking device improves the reliability and the balance of a valve actuating mechanism, simplifies the structure, reduces the processing difficulty of the rocker, improves the rigidity of the rocker, and improves the accuracy and operability of the adjustment of the valve clearance. In addition, when the engine compresses and brakes, the two exhaust valves can be opened at the same time, thereby improving the braking effect of the engine.

Description

technical field [0001] The invention relates to a four-stroke internal combustion engine compression braking device, which is an auxiliary braking device for automobiles, and belongs to the technical field of using a combustion engine as a brake in machinery. Background technique [0002] At present, as a form of auxiliary braking, four-stroke internal combustion engine braking is more and more widely used in commercial vehicles due to its excellent braking effect, low additional cost, and high reliability. On the one hand, the contribution of engine braking is to improve the braking capacity of the vehicle, and on the other hand, it is to reduce the braking load of the main brake of the vehicle. [0003] The principle of four-stroke internal combustion engine braking is to increase the movement resistance of the piston in the cylinder, and apply this resistance to the wheels of the vehicle from the crankshaft and the transmission system of the vehicle to form a braking forc...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the above technical problems, the technical problem to be solved by the present invention is to further improve the layout of the gap compensation mechanism and the control and check valve mechanism, as well as the structural integration degree on the rocker arm, so as to eliminate and weaken the above-mentioned various unfavorable factors, and propose a reliable , Simple four-stroke internal combustion engine compression braking device

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