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A variable stroke hydraulic device

A technology of hydraulic device and variable stroke, applied in the direction of machine/engine, mechanical equipment, etc., can solve the problem of gasoline engine knocking, and achieve the effect of reducing CO emissions, improving fuel economy, and high thermal efficiency

Active Publication Date: 2021-07-16
CHINA NORTH ENGINE INST TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, because the expansion stroke of the traditional engine is the same as the compression stroke, this limitation makes the engine power and economy improved by increasing the compression ratio, and at the same time, it will cause a series of problems such as gasoline engine knocking

Method used

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  • A variable stroke hydraulic device
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  • A variable stroke hydraulic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0023] In the exhaust stroke: the upper hydraulic hole (4) outputs oil, the lower hydraulic hole (5) enters oil, and the floating crank (2) moves upward; the connecting rod (3) drives the piston (4) to move upward more. 2) The distance h moved upwards, the exhaust stroke piston (4) moves upwards more than h distance is beneficial to reduce the amount of residual exhaust gas and heat load in the cylinder, such as image 3 shown.

[0024] During the suction stroke and the compression stroke, the position of the floating crank (2) is the same as that of the exhaust stroke.

[0025] In the expansion action stroke: the upper hydraulic hole (4) enters oil, the lower hydraulic hole (5) outputs oil, and the floating crank (2) moves downward; the connecting rod (3) drives the piston (4) to move downward more Turn (2) to move down the distance h, such as Figure 4 shown.

Embodiment approach 2

[0027] In the exhaust stroke: when the upper hydraulic hole 5 discharges oil and the lower hydraulic hole 6 enters the oil, the floating bell crank 2 moves upward; the connecting rod 3 drives the piston 4 to move upward by the distance h that the floating crank 2 moves upward, as image 3 shown.

[0028] In the suction stroke: when oil enters the upper hydraulic hole 5 and oil exits the lower hydraulic hole 6, the floating bell crank 2 moves downward, such as Figure 4 As shown, moving the piston 4 downwards by more distance h in the suction stroke is beneficial to increase the intake air volume in the cylinder.

[0029] In the compression stroke: when the upper end hydraulic hole 5 discharges oil, and the lower end hydraulic hole 6 enters oil, the floating bell crank 2 moves upward; the connecting rod 3 drives the piston 4 to also move upward by more than the distance h that the floating crank throw 2 moves upward, such as image 3 shown. The upward movement of the floating...

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Abstract

The invention provides a variable stroke hydraulic device, which comprises a fixed seat, a floating bellcrank, a connecting rod and a piston. The middle part of the floating bellcrank is connected to the piston through the connecting rod; Each of the support seats is movably arranged in a fixed seat, and the upper and lower ends of each fixed seat are respectively provided with an upper hydraulic hole and a lower hydraulic hole; when the lower hydraulic hole enters oil, the upper hydraulic hole outputs oil. , the hydraulic oil pushes the support seat to move upward in the fixed seat; when the upper hydraulic hole enters the oil, the lower hydraulic hole outputs oil, and the hydraulic oil pushes the support seat to move downward in the fixed seat. The present invention further improves the fuel economy by changing the cycle mode. Through a mechanism, the expansion stroke is greater than the compression stroke to obtain higher thermal efficiency. The longer expansion stroke can make full use of the energy of the fuel, and the longer expansion stroke can continue Oxidizes incompletely burned fuel to reduce harmful gas CO emissions.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a stroke-variable hydraulic device. Background technique [0002] In order to meet the increasingly stringent regulatory requirements and further improve the thermal efficiency of the engine, relevant engine manufacturers have adopted a series of technologies to improve the thermal efficiency of the engine, including miniaturization, charge conversion, homogeneous charge compression combustion, cylinder deactivation, multiple injection, EGR Wait. [0003] However, because the expansion stroke of the traditional engine is the same as the compression stroke, this limitation makes a series of problems such as gasoline engine knocking occur while improving engine power and economy by increasing the compression ratio. Contents of the invention [0004] In view of this, the present invention aims to propose a variable-stroke hydraulic device, which changes the cycle mode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B75/04
CPCF02B75/047
Inventor 孙丹红田永海梁红波梁永森苏立旺齐国栋
Owner CHINA NORTH ENGINE INST TIANJIN