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Gasket for solving cylinder cover sealing failure and estimating method of tightness of gasket

A sealing failure and gasket technology, which is applied to engine sealing devices, instruments, electrical digital data processing, etc., can solve the problems of increased gasket cost, long gasket development cycle, and uneven distribution of sealing pressure, so as to reduce the test cost , shorten the development cycle, and the effect of uniform force

Inactive Publication Date: 2019-04-16
TIANJIN LOVOL ENGINES
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  • Claims
  • Application Information

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Problems solved by technology

However, the result of these two methods is that the cost of the gasket increases, and it cannot fundamentally solve the problem of uneven sealing pressure distribution
In addition, the method of design + trial production + test is currently used to determine whether the gasket can meet the requirements. It is necessary to repeatedly modify the design according to the test results and then conduct tests until the gasket meets the design requirements. However, the development cycle of this method is long. The cost of testing is very high

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  • Gasket for solving cylinder cover sealing failure and estimating method of tightness of gasket
  • Gasket for solving cylinder cover sealing failure and estimating method of tightness of gasket
  • Gasket for solving cylinder cover sealing failure and estimating method of tightness of gasket

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Embodiment Construction

[0034] In order to further understand the content of the invention, features and effects of the present invention, the following embodiments are exemplified and described in detail with the accompanying drawings as follows:

[0035] The current engine cylinder head gasket is mainly designed to add a sealing band around the seal (such as cylinder port, oil hole, water hole) for sealing. It is easier to achieve sealing when the cylinder head bolts are evenly arranged. If the bolts are arranged Unevenness will result in uneven stress on the bolts on both sides of the gasket, e.g. figure 1 As shown in , there are 4 bolts shown in the shaded part below the gasket, and 3 bolts shown in the shaded part above the gasket. Since the tightening torque of each cylinder head bolt is the same, that is, the axial force generated by each bolt It is the same, the total force of 4 bolts of bolts 1#-4# is greater than the total force of 3 bolts of bolts 5#-7#, resulting in uneven force on both s...

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Abstract

The invention discloses a gasket for solving cylinder cover sealing failure and an estimating method of tightness of the gasket, and belongs to the technical field of engine fittings. N adjusting waves are added at the outer periphery, with more centralized bolts, of the gasket. The estimating method of the tightness of the gasket comprises estimation of elastic-plastic deformation performance ofthe gasket and estimation of sealing pressure of the gasket, wherein the estimating method of the sealing pressure of the gasket comprises the following steps: a calculating model is built; the material attributes of a machine body, a cylinder cover, a cylinder cover bolt and a gasket module are defined; the contact and the constraint among parts are built; and the sealing pressure distribution ofthe gasket is calculated by finite element analysis to determine if the sealing pressure of sealing strips in a cylinder port, a water hole and an oil hole on the cylinder cover gasket meets requirements or not. The estimation method of the elastic-plastic deformation performance of the gasket comprises the following steps: pressure wave characteristic curves of the adjusting waves in the gasketare obtained according to the stress and deformation conditions of the gasket; and then, the line pressure is converted to the surface pressure to obtain gasket pressure wave compression characteristic curve data and gasket pressure wave compression characteristic curves.

Description

technical field [0001] The invention belongs to the technical field of engine parts, and in particular relates to a gasket for solving the sealing failure of a cylinder head and a method for evaluating the sealing performance of the gasket. Background technique [0002] The engine cylinder head gasket is an important part connecting the body and the cylinder head. The main function of the cylinder head gasket is to ensure the sealing of the cylinder port of the body and the connecting water hole between the body and the cylinder head, so that the high-pressure gas, lubricating oil and The coolant does not flow out to the outside of the component. Most of the cylinder head gaskets currently on the market are steel gaskets, including the body and the adjustment wave (the gasket is raised in the vertical direction); the main function of sealing is the wave height and width of the adjustment wave. [0003] The current cylinder head gasket is mainly designed by adding sealing st...

Claims

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Application Information

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IPC IPC(8): F02F11/00G06F17/50
CPCF02F11/002G06F30/23G06F2119/06
Inventor 成效先马艳李燕彭飞飞
Owner TIANJIN LOVOL ENGINES
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