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Braking method and device of integrated exhaust type engine

An engine braking and integrated technology, applied in the direction of engine control, engine components, machine/engine, etc., can solve problems such as poor reliability and durability, increased engine height and weight, inconvenient installation and debugging, etc., to achieve Increased reliability and durability, reduced weight and height, and compact structure

Active Publication Date: 2014-07-02
奚勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The object of the present invention is to provide an integrated leak-type engine braking method, the integrated leak-type engine brake method will solve the reliability and durability of the leak-type engine brake technology in the prior art Technical problems such as poor performance, inconvenient installation and debugging, and increased engine height and weight

Method used

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  • Braking method and device of integrated exhaust type engine
  • Braking method and device of integrated exhaust type engine
  • Braking method and device of integrated exhaust type engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 and figure 2 A first embodiment of the integrated vented engine braking device of the present invention is shown in its "off" and "on" positions, respectively. The figure includes four main components: an exhaust valve actuator 200 , an exhaust valve 300 (including an inner exhaust valve 3001 and an outer exhaust valve 3002 ), an engine brake driving mechanism 100 and an engine brake control mechanism 50 .

[0046] Exhaust valve actuator 200 includes cam 230 , cam follower 235 , rocker arm 210 and valve bridge 400 . Usually, one end of the rocker arm 210 (the side close to the valve bridge or the side close to the cam) has a valve clearance adjustment system. In this embodiment, a valve gap adjusting screw 110 is provided on one side of the valve bridge 400 , and the valve gap adjusting screw 110 is located on the rocker arm 210 and fixed by the locking nut 105 . The valve gap adjusting screw 110 is connected with the elephant foot pad 114 , and the...

Embodiment 2

[0056] Such as image 3 and Figure 4 A second embodiment of the integrated vented engine braking device of the present invention is shown in its "off" and "on" positions, respectively. The main differences between this embodiment and the first embodiment are:

[0057] 1. An automatic valve gap adjustment mechanism is added. The automatic valve gap adjustment mechanism includes an adjustment piston 162 and an adjustment spring 166 . The regulating piston 162 is located in an upwardly opening central bore in the valve bridge 400 . The adjusting spring 166 is located between the adjusting piston 162 and the valve bridge 400 , biasing the adjusting piston 162 upwardly against the foot pad 114 . The one-way oil supply valve of the oil supply mechanism is located in the regulating piston 162 . A valve gap 130 is provided between the regulating piston 162 and the valve bridge 400 . The valve gap 130 is smaller than the stroke 234 of the brake piston 160 (the distance between t...

Embodiment 3

[0064] Such as Figure 5 and Figure 6 A third embodiment of the integrated vented engine braking device of the present invention is shown in its "OFF" and "ON" positions, respectively. The oil supply mechanism in this embodiment is integrated with the supporting mechanism 125 . There is an oil supply piston 162 inside the adjustment screw 1102 of the support mechanism 125 . There is a hydraulic channel 115 in the oil supply piston 162 , which communicates with the hydraulic channel 214 in the rocker arm 210 through the horizontal oil hole 113 in the adjusting screw 1102 . A one-way oil supply valve 172 is arranged in the hydraulic flow channel 115 . In addition, the unloading channel 197 in the valve bridge 400 is also an oil supply channel at the same time. The sealing ring 173 disposed in the end face of the oil supply piston 162 can prevent leakage caused by uneven or misaligned contact surfaces.

[0065] When engine braking is required, the brake control mechanism 50...

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Abstract

A method for braking an integrated exhaust engine. When an exhaust brake (700) of a brake control mechanism (50) is closed, the exhaust back pressure of the engine is increased. An inner exhaust valve (3001) is opened downwards by rebounding at a late stage of an intake stroke, a brake piston (160) within a valve bridge is moved to an operating position, and the inner exhaust valve (3001) is kept perpetually open at a low flow rate, the exhaust braking of the engine is thus generated. When a cam (230) of the engine drives a valve bridge (400) to open an exhaust valve (400), a support mechanism (125) integrated within a rocker arm (210) is separated from the valve bridge (400), a fluid discharging passage (197) within the valve bridge is opened, and the brake piston (160) is retracted to a non-operating position. Also provided is an apparatus for implementing the method, comprising a brake driving mechanism and a brake control mechanism. The brake driving mechanism comprises the brake piston (160), a piston-limiting mechanism (137, and 142), a fuel supplying mechanism, a fuel discharging mechanism, and the support mechanism (125). The brake piston (160) is arranged within a piston hole (190) of the valve bridge (400). The fuel discharging mechanism comprises within the valve bridge (400) the fluid discharging passage (197). The support mechanism (125) is adjustably integrated within the rocker arm (210), the bottom of the support mechanism is closely in contact with the valve bridge (400), sealing the fluid discharging passage (197). The apparatus has a simple braking principle, compact structure, and is convenient to install and to adjust.

Description

Technical field: [0001] The invention relates to the field of machinery, in particular to the field of valve driving of vehicle engines, in particular to an integrated leak-type engine braking method and device. Background technique: [0002] Engine braking technology can be divided into cylinder braking and external braking. In-cylinder braking of the engine simply converts the engine temporarily into a compressor. The fuel is cut off during the conversion process, and the exhaust valve is opened at the end of the engine piston compression stroke to allow the compressed gas (air during braking) to be released. The energy absorbed by the engine during the compression stroke cannot be used in the subsequent expansion. The stroke returns to the engine pistons, but is dissipated through the engine's exhaust and cooling system. The end result is effective engine braking that slows the vehicle. [0003] The out-of-cylinder braking technology of the engine has been known as ear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L13/06F02D13/04F01L1/24
CPCF01L1/20F01L1/267F01L2105/00F01L1/181F01L1/462F01L13/06F01L2305/00
Inventor 杨洲
Owner 奚勇
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