An integrated rocker arm for engine braking

Abstract

The invention belongs to the technical field of engines and particularly relates to an integrated rocker arm used for achieving engine braking. The rocker arm is arranged on a rocker arm shaft. A driving mechanism driving the rocker arm to swing around the rocker arm shaft is arranged at one end of the rocker arm, and a braking mechanism is arranged at the other end of the rocker arm. The rocker arm shaft is provided with a braking oil channel and a lubricating oil channel. A braking adjusting bolt and a braking piston are communicated with the braking oil channel in the rocker arm shaft through a first braking oil channel and a second braking oil channel in the rocker arm. The braking piston is further communicated with the lubricating oil channel in the rocker arm shaft through a first lubricating oil channel in the rocker arm. The lubricating oil channel in the rocker arm shaft is further communicated with the driving mechanism through a second lubricating oil channel. The driving mechanism drives the rocker arm to swing around the rocker arm shaft and controls actions of the braking mechanism in cooperation with signals of an electromagnetic valve so as to control actions of an exhaust valve bridge or a single exhaust valve. The integrated rocker arm used for achieving engine braking does not need to be additionally provided with a complex mechanical hydraulic structure, and integration modularization, simplification and low cost of an engine braking mechanism are achieved.

Description

Technical field: [0001] The invention belongs to the technical field of engines, in particular to an integrated rocker arm for generating engine braking. 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, high-efficiency, sustained and stable retarding performance and engine brakes without material consumption have received widespread attention and have been gradually promoted and applied. At the end of 2012, the re...

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Problems solved by technology

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

For example, in 1974, JVS Company of the United States disclosed a method of hydraulically locking the brake piston in the extended position during braking, and transmitting the cam movement to the valve bridge to open two valves at the same time in patent No. 3809033. The rocker arm is subjected to a huge load; the integrated rocker brake system for the overhead four-valve engine disclosed by Volvo (Volvo) in 1996 in the No. 5564385 patent has added a single channel to provide dual oil pressure supply. Oil mechanism, low oil pressure is used for lubrication, high oil pressure is used for braking, which increases the complexity of the system; Chery Automobile Co., Ltd. has published an engine braking device with application number 200810024409.2, which is easy to control, but needs to be increased Additional cam switching device, relatively high manufacturing and assembly costs

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