Into, the sealing between exhaust valve and crock lid valve base detects

Into, of exhaust valve and cone of crock lid valve base cooperate quality, the output power that affects car engine directly, oily bad news, but how to evaluate what spiracle and crock build spiracle valve base to cooperate quality, it is a more complex issue. 1 detect sealed necessary enter with the likelihood, of exhaust valve and cone of crock lid valve base cooperate quality, the output power that affects car engine directly, oily bad news, but how to evaluate what spiracle and crock build spiracle valve base to cooperate quality, it is a more complex issue. Classics analysis, the element that the influence cooperates condition basically has at 2 o'clock, namely the position error that sum of errors of appearance of the cone angle error of sealing surface, cone enrages a sealed cone to cover hole of spiracle guide bar relative to the crock. In view of enter suitably with crock lid, exhaust valve is being made close check will be passed after ending, parameter of its geometry dimension and appearance, position all is controlled inside limits of formulary public errand, reason is entered in the test, when exhaust valve and the air-tightness that the crock cooperates between lid valve base, object getting check is the crock lid after treatment ends. To this, the crock built product figure to set the noncombatant duty of housing washer cone angle, and the after compressing air leak rate that cooperate when housing washer and eligible valve and knows rated pressure. Clearly, leak is sealing surface of crock of lid housing washer all error element (include housing washer the position that sealed cone covers guide bar hole relative to the crock is spent) the result of joint action, and measures awl angular displacement can be used at undertaking craft adjust to equipment directly. 2 air-tightness are online detected principle and device are detect these two parameter, the factory used contemporary car motor one kind applies to workshop spot, implement the online test method of the operation well and truly. Graph the pneumatic that 1 graph shows 1 times measured systematic sketch map to mirror this kind to detect methodological mechanism and characteristic. See from inside the graph, the imitate of working section appearance that should measure a head a valve, what its insert a crock to cover spiracle conduit hole is cylindrical the appearance of oriented part and workpiece guide bar is identical, the diameter that just measures ＂ of head ＂ guide bar relatively the floor level small 5µm that the crock builds tracheal aperture internal diameter. The pneumatic that measures a head detects the awl that place is enraging correspondence of portal sealing surface (body) on the face, it is gauge of a cone-shaped pneumatic actually, two annular spray head are carried on the cone of gauge, the width of every annular nozzle is 0.

05mm, both apart is 0.

7mm. Among them, above that is used at detecting leakage rate, and below that is used at detecting the cone angle error of sealing surface. To realize above requirement, the cone angle of oneself of cone-shaped pneumatic gauge is more than the cone angle of housing washer sealing surface slightly, accordingly, in inserting crock of portal that cover energy of life when its when, go up by bus at nominal manage (namely 2/3 is sealed area is wide) on annular nozzle will be contacted with housing washer cone, and next annular faces have space between nozzle criterion and housing washer cone. What graph 1a place shows is the circumstance when measuring a head to have not encounter with the place that be measured. Also because pursue 1 medium pneumatic gauge (measure a head) contain imitate to enter, of exhaust valve guide bar cylindrical oriented part, of it and aperture of conduit of crock lid valve cooperate clearance very small. Reason besides can assure to detect in exercise process good and oriented outside, indirect still ground solved what the position of relatively tracheal aperture spends sealed to housing washer of crock lid valve cone to detect. If the position is spent,slant big, will cause pneumatic to measure the corresponding deviate between head working face and cone of the housing washer that be measured (askew) , occurrence clearance also can cause certain leak. Graph 2 pneumatic measure what adopt commonly is to measure way quite, because this must deserve have a group of standard component, use at having place to testing system 0, calibration. With the graph a shown pneumatic gauge cooperates to use have 3 standard component, it is the public errand on cone angle, public errand below cone angle and leakage rate to allow a value respectively. If public errand of workpiece cone angle is 90 ° - 1 ° , criterion before two standard component are made respectively 89 ° and 90 ° . The crock is equivalent to building housing washer sealing surface to go up to have 4 shallow chamfer in the inner cone face of standard component of the 3rd leak, air current causes leak through these shallow chamfer just about, but can relatively use the method with long deep slot grinding to ensure its leak rate is rating conveniently. Graph the 2 structural sketch map that are leak standard component, its are rated leak rate is 400ml/min, test pressure is 105Pa. 3 online detect the pneumatic that two kinds of forms of device show 1 times in the graph surveys a system in, 2 adoption instrument, be handled namely and show unit to be carburettor float flowmeter. Heretofore, this kind of traditional pattern is in engine of domestic and international car still has application in the factory, but go up oneself century since 90 time, after the testing instrument signal that measures a generation by pneumatic collects go on a pilgrimage for Buddhist scriptures generally already to enrage report to change, input the computer with the means of telegraphic date, show through analysing processing further to give again or printout. Current, in engine of a modern car factory crock builds product line in, afore-mentioned measurement the system basically has two kinds of forms, the first kind is similar plan the hand of 1 uses device, the workpiece that ends to treatment has sampling observation: The 2nd kind is series connection the autoverify machine in product line, with full automatic means carries out 100% tests to workpiece. But be in usually, the cone angle that latter checks a crock to build housing washer only and leak lead two parameter (the graph shows) 1 times, and former add item of a few tests toward contact, if enraging the guide bar part of momentum compasses to be set again,two are measured sectional, build diameter of spiracle guide bar and taper with measuring a crock at the same time. When handlers firm quietly makes cone-shaped gauge the top of head is worn sealing surface of crock of lid valve housing washer, next gently circumgyrate circuit, return the circularity that can get the crock covers tracheal hole. CNC Milling