Equipment, method and device for measuring engine valve spring force

Abstract

The invention discloses engine valve spring force measurement equipment, method and device. The engine valve spring force measurement equipment comprises a running condition simulation device, a corner sensor, a valve spring, a strainmeter, a signal cable and a measurement device, wherein the running condition simulation device is connected with the valve spring and the corner sensor, the corner sensor is connected with the measurement device, the strainmeter is directly pasted onto an outer surface of a spring wire of the valve spring and is connected with the signal cable, the signal cable is arranged along the outer surface of the spring wire of the valve spring and is connected with the measurement device, and an included angle between a grid wire of the strainmeter and the axis of thespring wire of the valve spring is within a preset range. A strain signal of the valve spring under a condition of simulating a running boundary of an engine distribution mechanism can be acquired bythe strainmeter directly pasted onto the outer surface of the spring wire of the valve spring, the strain condition of directly measuring the valve spring under a dynamic condition is met, so that the obtained valve spring force is more approximate to and accurate with actual force.

Description

technical field [0001] The invention relates to the technical field of engine testing, in particular to a measuring device, method and device for engine valve spring force. Background technique [0002] The engine air distribution system is a very important system in the automobile engine system. Among them, the valve spring is one of the key components of the engine air distribution system. Its function is to ensure that the valves are seated in time and fit closely, and prevent the sealing performance of the cylinder from being reduced due to valve jumping. . When the stiffness of the valve spring is compatible with the engine, it can not only meet the functional requirements such as the dynamic response of the valve seat, but also avoid excessive friction loss affecting the economy and reliability of the engine. Therefore, in order to adapt the stiffness of the developed valve spring to the engine, it is necessary to measure the dynamic force of the valve spring when des...

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Problems solved by technology

[0004] However, the inventor found through research that, according to the measured strain of the rocker arm under the action of the valve spring, the way of deriving the magnitude of the valve spring force is reversed, ignoring that the strain of the rocker arm is not only the effect of the valve spring in some operating conditions For example, the temperature change of the rocker arm itself, the change of oil pressure, etc. will cause the strain of the rocker arm, that is, the strain of the rocker arm not only reflects the magnitude of the valve spring force, but indirectly reflects the The valve spring force does not match the reality, and there is a large error

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