Mechanical connection type engine integration rocker arm brake device with valve lift reset function

Abstract

The invention belongs to the technical field of automotive auxiliary brake devices and particularly relates to a mechanical connection type engine integration rocker arm brake device with a valve lift reset function. A roller is arranged at one end of a rocker arm through a pin and is in contact connection with an exhaust cam; a brake mechanism is arranged at the other end of the rocker arm and controls the motion of an exhaust valve bridge; a control mechanism is mounted at the position, between the brake mechanism and a rocker arm shaft, on the rocker arm; a brake oil way is arranged on the rocker arm shaft; the exhaust cam rotates to drive the rocker arm to swing around the rocker arm shaft, and drives the motions of the control mechanism and the brake mechanism under the cooperation of an electromagnetic valve to further control the motion of the exhaust valve bridge. The mechanical connection type engine integration rocker arm brake device has the valve lift reset function and a valve gap adjusting function, the layouts of the control mechanism and the brake mechanism are further improved, integration of valve lift reset is optimized, and the structure is more compact, so that adverse factors in the engine brake process are eliminated and weakened, and the brake process is more reliable.

Description

Technical field: [0001] The invention belongs to the technical field of automobile auxiliary braking devices, in particular to a mechanically connected engine integrated rocker arm braking device with valve lift and reset. Background technique: [0002] With the continuous development of the domestic economic situation and the rapid construction of expressways, the logistics and transportation industry with automobiles as the main means of transportation has become an important part of the national economy. Driven by science and technology, trucks are increasingly becoming heavy-duty and high-speed. Traditional mechanical friction brakes are overwhelmed at work and often fail due to severe friction wear and high temperature of the brake hub, resulting in frequent traffic accidents. hair, endangering personal safety. In this case, the engine brake with high efficiency, sustained and stable retarding performance and no material consumption has received widespread attention an...

AI Technical Summary

Problems solved by technology

[0008] However, there are still many deficiencies in the development and research of this integrated rocker system.

For example, in 2001, the U.S. Mark (Mack) truck company disclosed another integrated rocker brake in the patent No. 6234143, which added an exhaust gas recirculation (EGR) boss to the original cam mechanism, and increased the valve bridge. However, only one exhaust valve is opened during braking, and there is also an asymmetric load on the valve bridge and the rocker arm; in 2001, Cummins (Cummins) Engine Company disclosed a valve with a valve lift reset mechanism in US Patent No. 6253730 The integrated rocker brake system solves the asymmetric load problem caused by opening the single valve when braking.

However, the reset time is too short and the reset height is too small, so it cannot work normally when the engine rotates at a high speed; the application number disclosed by Chery Automobile Co., Ltd. is a kind of engine brake device of 200810024409.2, although the engine brake device is easy to control, However, an additional cam switching device needs to be added, and the manufacturing and assembly costs are relatively high

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