Novel adjustable hydraulic tappet

A hydraulic tappet, a new type of technology, is applied to non-mechanically actuated valves, engine components, machines/engines, etc. It can solve problems such as limited working length adjustment range, inability to drive exhaust valves to open, and enhance engine effects, etc., to achieve The effect of enhancing the braking effect

Inactive Publication Date: 2014-07-16
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The hydraulic pressure in this kind of hydraulic tappet is fixed, and the adjustment range of its working length is limited, which can only adapt to the change of the thermal state of the engine, and cannot drive the exhaust valve to open to enhance the engine braking effect, let alone realize the engine braking effect. Mutual conversion between normal operating conditions and braking conditions

Method used

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  • Novel adjustable hydraulic tappet

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Embodiment Construction

[0014] An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0015] Such as figure 1 As shown, a new type of adjustable hydraulic tappet includes a tappet disk (2) in direct contact with the gas distribution cam (1), a plunger (8) in direct contact with the push rod (9), and the plunger (8) The lower end surface is spherical, and forms a hydraulic oil cavity (7) with the upper end surface of the tappet disk (2). A check valve (6) is arranged at the inlet of the hydraulic oil chamber (7), and a solenoid valve (16) is arranged at the outlet. When the valve lift is zero, the hydraulic oil chamber (7) communicates with the oil passage (4) processed on the body. The inlet of the oil passage (4) is provided with a proportional valve (5), which is controlled by the engine ECU and can dynamically adjust the oil pressure entering the oil passage (4) and the hydraulic oil chamber (7). When the engine was running normally, th...

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Abstract

The invention relates to a novel adjustable hydraulic tappet. The novel adjustable hydraulic tappet can remove engine valve clearance, and can enable an exhaust valve to keep continuously open through adjustment of hydraulic pressure under the working condition of engine brake, the opening degree is controlled by the hydraulic pressure, and therefore the power of engine brake is adjustable. The novel adjustable hydraulic tappet comprises a tappet disk which makes direct contact with an engine air distribution cam and a plunger which makes direct contact with a push rod, wherein an oil duct which is machined on an engine body is arranged between the tappet disk and the plunger, a proportional valve is arranged at the inlet of the oil duct, a solenoid valve is arranged at the outlet of the oil duct, and a one-way valve is installed at the inlet of a hydraulic chamber between the tappet disk and the plunger. When an engine normally works, the proportional valve inputs low oil pressure to remove the valve clearance; under the working condition of engine brake, the opening degree of a valve can be adjusted in a dynamic mode through the fact that the pressure of oil which flows into the oil duct can be adjusted through the proportional valve, and requirements of engine brake under different working conditions can be met. The novel adjustable hydraulic tappet can be used in matching with an engine exhaust emission retarder to achieve a better braking effect.

Description

technical field [0001] The invention relates to a hydraulic tappet for adjusting an engine gas distribution mechanism, in particular to a novel adjustable hydraulic tappet. By adjusting the hydraulic pressure in the hydraulic tappet, the valve gap can be eliminated under normal engine working conditions, and the valve opening can be automatically adjusted under engine braking conditions to change the engine braking power. Background technique [0002] The valve lifter is a very important part of the engine valve train. The hydraulic lifter is usually installed between the valve cam and the valve stem of the camshaft overhead engine to eliminate the valve clearance. When the thermal state of the engine changes , The hydraulic tappet can adjust the effective working length accordingly to meet the working requirements. [0003] Engine braking refers to the braking performance caused by the mechanical loss of the engine, pumping loss, etc. when the car is driven by the engine. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L13/06F01L1/255F02D13/04
CPCF01L13/0031F01L13/065F01L9/14
Inventor 董颖赵迎生
Owner ZHEJIANG NORMAL UNIVERSITY
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