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Valve actuating system of engine and method for generating engine auxiliary valve lift curve

An actuation system, valve actuator technology, applied in engine components, engine control, machine/engine, etc., can solve the problems of large inertia of braking system, increase volume and weight, reduce hydraulic flexibility, etc., to reduce costs, The effect of reducing requirements and simplifying design

Inactive Publication Date: 2013-12-25
SHANGHAI UNIVERSOON AUTOPARTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce hydraulic flexibility, a large diameter hydraulic piston must be used, increasing volume and weight
Moreover, it takes a long time for the oil flow to extend or retract the large-diameter piston, resulting in large inertia and slow response of the braking system

Method used

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  • Valve actuating system of engine and method for generating engine auxiliary valve lift curve
  • Valve actuating system of engine and method for generating engine auxiliary valve lift curve
  • Valve actuating system of engine and method for generating engine auxiliary valve lift curve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 with figure 2 As shown, the fixed chain type engine brake device 100 of the present invention is composed of a brake box 2102, a driving mechanism and a braking mechanism. Intersecting vertical blind holes 190 and horizontal blind holes 260 are provided in the brake box 2102. The driving mechanism includes a driving piston 164 and a rolling ball 175. The driving piston 164 forms a fluid seal with the horizontal blind hole 260. One end of the driving piston Contact with the rolling ball to form cooperation; the braking mechanism includes a braking plunger 160 . The driving piston 164 and the rolling ball 175 are located in the horizontal blind hole 260 of the brake housing 2102, usually pushed to the left by the return spring 156, and rest on the end face 246 of the piston hole 260, as figure 1 shown. One end of the return spring 156 is located on the rolling ball 175 of the drive mechanism, and the other end is located on the spring seat 158, the spri...

Embodiment 2

[0047] Such as image 3 with Figure 4 As shown, this embodiment is an improvement on the basis of Implementation 1, and specifically integrates the driving piston 164 and the rolling ball 175 in Embodiment 1. The left part of the driving piston 164 is a guiding and sealing piston, and the driving surface of the right part is a spherical surface 163 (also may be a conical surface, etc.).

Embodiment 3

[0049] Such as Figure 5 with Image 6 As shown, this embodiment is also an improvement on the basis of Embodiment 1. Compared with Embodiment 1, this embodiment cancels the driving piston, increases the return piston 162, and forms a fluid seal with the horizontal blind hole 260, and the return piston 162 is provided with decompression and discharge holes 122 and 168 (also can be a tapered combined hole). The return piston 162 is combined with the return spring 156, and the return spring 156 leans against the return piston 162 on the rolling ball 175 to press the decompression hole 122 to ensure that the rolling ball 175 is always close to the return piston 162.

[0050] The working process of this embodiment is: when the engine needs to start from the normal working state (such as Figure 5 shown) to transition to engine braking state (as shown in Image 6 As shown), the engine brake control mechanism (not shown in the figure) opens the oil supply, and the engine oil flow...

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Abstract

The invention discloses a valve actuating system of an engine and a method for generating an engine auxiliary valve lift curve. A main valve lift curve of the engine is generated in the first working state of the system, and an auxiliary valve lift curve is generated in the second working state of the system. The system comprises a mechanical loading solid chain type auxiliary valve actuator. The solid chain type auxiliary valve actuator comprises a rolling ball or a drive piston or the combination of a rolling ball and a drive piston, a spring and a fluid flow channel, wherein the rolling ball or the drive piston or the combination of the rolling ball and the drive piston can move between a first working station and a second working station, the valve actuating system is in the working state and generates the main valve lift curve when in the first working station, the valve actuating system is in the second working state and generates the auxiliary valve lift curve when in the second working station, the fluid flow channel is used for providing pressurized fluid, and the spring and the pressurized fluid play roles on the two sides of the rolling ball or the drive piston or the combination of the rolling ball and the drive piston respectively to control the rolling ball or the drive piston or the combination of the rolling ball and the drive piston to switch between the first working station and the second working station.

Description

[0001] This application is a divisional application of an invention patent application submitted to the China Patent Office on May 27, 2010, with the application number 201010186306.2, and the invention name is "A Fixed Chain Engine Braking Device". The entire content is recorded in the original application middle. technical field [0002] The invention relates to the mechanical field, in particular to an engine valve actuation system and a method for generating an engine auxiliary valve lift curve. Background technique [0003] 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. The fuel is cut off during the conversion process, and the exhaust valve is opened at or near 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L13/06F02D13/04
Inventor 杨洲柯恩九奚勇
Owner SHANGHAI UNIVERSOON AUTOPARTS CO LTD
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