CN103868684A - Fatigue test device for VVT (Variable Valve Timing) engine piston - Google Patents
Fatigue test device for VVT (Variable Valve Timing) engine piston Download PDFInfo
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- CN103868684A CN103868684A CN201410097951.5A CN201410097951A CN103868684A CN 103868684 A CN103868684 A CN 103868684A CN 201410097951 A CN201410097951 A CN 201410097951A CN 103868684 A CN103868684 A CN 103868684A
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Abstract
The invention provides a fatigue test device for a VVT (Variable Valve Timing) engine piston and belongs to the technical field of engine test equipment. The problem that the test data of the present fatigue test device is not accurate enough is solved. The fatigue test device for the VVT engine piston comprises a frame, wherein a first cam is in rotating connection with the frame through a rotating shaft; a connecting shaft is vertically connected with a side face of the first cam; a distance-adjusting structure is arranged between the connecting shaft and the cam; a sleeve is fixedly connected with the frame; the rotating shaft is connected with a driving structure; a detecting structure for detecting the coaxiality of a cylinder sleeve and the piston is also arranged on the frame; an adjusting structure for adjusting the coaxiality of the cylinder sleeve and the piston is arranged on the sleeve and the connecting shaft. The fatigue test device for the VVT engine piston can be used for performing a fatigue test under the condition that the coaxiality of the cylinder sleeve and the piston is ensured. The accuracy of the test data is increased.
Description
Technical field
The invention belongs to engine test facility technical field, relate to a kind of fatigue experimental device of VVT engine piston.
Background technology
Along with the quickening of the rhythm of life of growth in the living standard, automobile has become walking-replacing tool indispensable in life and means of transport, and in the structure of Automobile Complex, engine is the heart of automobile, for the walking of automobile provides power, be related to dynamic property, economy, the feature of environmental protection of automobile.In simple terms, engine is exactly an energy transfer mechanism, by the heat energy of gasoline (diesel oil) or rock gas, by the gas expansion that burns, promotes piston work done in sealing air cylinder, changes mechanical energy into, and this is the most basic principle of engine.Along with the raising of scientific and technological level, technician is carrying out constantly improving to engine, then occurred VVT technology, VVT is Variable Valve Timing Technique of IC Engine namely, and its principle is the ruuning situation according to engine, adjust the amount of air inlet (exhaust), with valve folding time, angle, make the air capacity entering reach best, improve burning efficiency, it has advantages of that fuel-efficient, merit rises than large.The efficient operation of VVT engine be unable to do without the key working part of engine simultaneously, i.e. piston due to piston function effect key, therefore needed first to detect the fatigue lifetime to piston before dispatching from the factory.
As Chinese utility model patent application (application number: 201220020235.3) disclose a kind of piston fatigue life test rack, be particularly useful for the test of fatigue lifetime of engine piston skirt section, a station of testing table comprises the cam being arranged on camshaft, one end in contact of the periphery of described cam and push rod, described push rod outer cover is equipped with Compress Spring, the other end of described push rod is connected with one end of force cell, and the other end of described force cell is connected with the piston action bar for to the piston application of force.The utility model, by the design to camshaft and spring, push rod, completes the skirt section of piston is applied and is periodically similar to sinusoidal wave vibration force, to evaluate piston product skirt section fatigue life test performance.This testing equipment can detect the fatigue lifetime of piston skirt, but can not detect the wear-out life that piston works long hours, while detecting the piston fatigue life-span at present, the common practice is inserted in piston in cylinder sleeve, by mechanism's driven plunger to-and-fro movement, to detect the degree of wear of piston, but because lacking effective right alignment in the time inserting cylinder sleeve, piston detects, therefore cause piston local pressure excessive, and then cause piston concentrated wear in process of the test excessive, test figure is not accurate enough.
Summary of the invention
The object of the invention is to have the problems referred to above for existing technology, a kind of fatigue experimental device of VVT engine piston has been proposed, the fatigue experimental device of this VVT engine piston can carry out torture test under the operating mode that ensures piston and cylinder sleeve right alignment, improves test figure accuracy.
Object of the present invention can realize by following technical proposal: a kind of fatigue experimental device of VVT engine piston, comprise frame, it is characterized in that, in described frame, be rotatably connected to cam one by rotating shaft, on the side of described cam one, be vertically connected with one for connecting the coupling shaft of piston rod, between described coupling shaft and cam, be provided with the pitch adjusting structure that can regulate distance between coupling shaft axial line and rotating shaft core line, in described frame, be fixed with one for placing the sleeve of cylinder sleeve, the axial line of described sleeve and the axial line of coupling shaft are perpendicular, the drives structure that described rotating shaft and can driving cam be rotated is connected, in described frame, be also provided with the detection architecture that can detect cylinder sleeve and piston coaxial degree, on sleeve and coupling shaft, be provided with the adjustment structure that can regulate cylinder sleeve and piston coaxial degree.
Between the axial line of rotating shaft and the axial line of coupling shaft, there is distance, therefore drives structure drive shaft is rotated, and then cam one rotates, coupling shaft can do taking rotating shaft as circle center of circle motion, and piston and piston rod are hinged, piston sliding plug is in cylinder sleeve, and coupling shaft swings with piston rod, under the constraint of cylinder sleeve, piston is realized along cylinder sleeve axially reciprocating simultaneously; Pitch adjusting structure can regulate the distance between coupling shaft axial line and rotating shaft core line, the radius of a circle that regulates coupling shaft to rotate, can realize the adjusting of piston movement stroke by this adjusting, also can make this device be applicable to the piston rod of different length, applicability is stronger; Cylinder sleeve is fixed in sleeve, piston rod is fixed on coupling shaft, position and the piston rod position on coupling shaft of cylinder sleeve in sleeve all can have influence on the right alignment between piston and cylinder sleeve, therefore before test, first coordinate adjustment structure to align with the assigned address on coupling shaft to the cylinder sleeve being fixed in sleeve by detection architecture, then piston rod is fixed on coupling shaft, thereby ensure the right alignment between piston and cylinder sleeve, make test figure more accurate.
In the fatigue experimental device of above-mentioned VVT engine piston, described drives structure comprises a drive motor, described frame comprises substrate, on described substrate, be vertically fixed with two web joints, described rotating shaft rotating shaft is connected on two web joints, a plate is stretched out in one end of rotating shaft, above-mentioned cam is connected in the external part end of rotating shaft, described rotating shaft position between two web joints is fixed with a driven pulley, on described drive motor, be fixed with driving pulley, described driving pulley is connected by belt with driven pulley.When test, substrate is laid immediately on testing table, because needing piston, the torture test of piston moves for a long time, therefore adopt this comparatively stable and long power source of life-span of drive motor, driven pulley is connected by belt with driving pulley, therefore driven pulley can be subject to the tensile force of belt, rotating shaft connects by two web joints for this reason, and driven pulley is fixed on position between two web joints, ensure that rotating shaft is subject to the anchorage force of web joint even, avoid long-time process of the test shaft distortion.
In the fatigue experimental device of above-mentioned VVT engine piston, described pitch adjusting structure comprises cam two and two adjusting bolts, on described substrate, be fixed with a grafting axle, described cam two is slidably located on grafting axle, described grafting axle and rotating shaft concentric arrange, the link slot all offering on described cam one two sides relative with cam two, described link slot is radially offering along cam one and cam two respectively, the bottom land of described link slot offers along its length and runs through groove, the described width that runs through groove is less than the width of link slot, and the width that runs through groove is greater than the external diameter of coupling shaft, one end end face of described coupling shaft offers screw one vertically, other end end face offers screw two vertically, the axial line of described screw one, the axial line of screw two and the axial line of coupling shaft be not all on same straight line, the external diameter of described coupling shaft is consistent with the width of link slot, an adjusting bolt is connected in screw one through running through groove spiral, another root adjusting bolt is connected in screw two through running through groove spiral.The two ends that are coupling shaft are slidably connected in link slot, need to, according to the length of throw of poston needs and piston rod, unclamp adjusting bolt, coupling shaft can move along link slot, after position suitable, screw adjusting bolt, adjusting bolt can be pressed on cam one and cam two two ends of coupling shaft; Simultaneously because coupling shaft can be subject to circumferential acting force in process of the test, therefore coupling shaft easily occurs from then causes adjusting bolt loosening in process of the test, for this reason, the coupling shaft external diameter of this device is consistent with the width of link slot, axial line, the axial line of screw two and the axial line of coupling shaft of screw one be not all on same straight line simultaneously, avoid coupling shaft to occur the situation of rotation, make structure more stable; And cam two is set on grafting axle, after adjusting bolt is unclamped, cam two can move and depart from coupling shaft relative to the axle of pegging graft, and is now inserted in for piston rod.
In the fatigue experimental device of above-mentioned VVT engine piston, described adjustment structure comprise Zhou Shang mechanism that can the position of regulating piston bar on coupling shaft and can regulate and stationary housing put mechanism.Under the cooperation of detection architecture, axial means regulates the position of piston rod, puts mechanism the position of cylinder sleeve is regulated, and ensures the right alignment of piston and cylinder sleeve.
In the fatigue experimental device of above-mentioned VVT engine piston, described Zhou Shang mechanism comprises that one for connecting adapter sleeve and the two column locating pieces of piston rod, described coupling shaft comprises connecting portion and is positioned at the threaded portion at connecting portion two ends, on the periphery wall of described threaded portion, there is external thread, the external diameter of described connecting portion is greater than the external diameter of threaded portion, described adapter sleeve is slidably located on connecting portion, described locating piece offers threaded hole on one side, on opposite flank, offer spliced eye, described spliced eye and threaded hole connect, and the internal diameter of spliced eye is consistent with the external diameter of connecting portion, described two contiguous blocks are connected on the threaded portion at connecting portion two ends by threaded hole spiral respectively, and spliced eye is set on connecting portion, the side of some position piece is pressed on adapter sleeve end face, described coupling shaft is all arranged with a locking spring and a stop nut on two threaded portions, one end of described locking spring is pressed on locating piece, the other end is pressed on stop nut.Connecting portion is roughly positioned at the axial middle part of coupling shaft, the threaded portion at two ends is used for connecting locating piece and stop nut, on adapter sleeve, there is the joint face matching with piston rod, certainly also can be with changing adapter sleeve according to the dissimilar of piston rod, adapter sleeve is set on connecting portion, rotation locating piece, make two locating pieces compress respectively the two ends end face of adapter sleeve, and show according to detection architecture, rotate the axial location that two locating pieces regulate adapter sleeve, after regulating, position fixes by two locating pieces, because locating piece is subject to the circumferential acting force of part of piston rod, therefore there will be a small amount of rotation, occur loosening for fear of locating piece rotation, on threaded portion, connect locking spring and stop nut, under the effect of locking spring, locating piece and stop nut are all compacted, avoid occurring rotation and become flexible.
In the fatigue experimental device of above-mentioned VVT engine piston, the described mechanism that puts comprises and in sleeve lateral wall, offers vertically four gathering sills, these four gathering sills are circumferentially uniformly distributed, on the lateral wall of sleeve, also there are four guide rails, these four guide rails are relative with four gathering sills, in described guide rail, all slide and be provided with two positioning screw caps or bolt, described bolt is through setscrew nut and gathering sill, and the insertion end of bolt is fixed with one and compresses plate, the described xsect that compresses plate is curved, described in compress on the side of plate and be fixed with rubber layer.Cylinder sleeve screws bolt after inserting sleeve, the compressing plate and can be pressed on cylinder sleeve lateral wall of bolt head, and rubber layer can reduce the stress that cylinder sleeve lateral wall is subject to and concentrates, avoid breaking, only can regulate the position of cylinder sleeve in sleeve according to detection architecture vision-control bolt simultaneously, cylinder sleeve is alignd with the specified point on adapter sleeve, and bolt and setscrew nut can move while unclamping in gathering sill, can be applicable to the cylinder sleeve of different length.
In the fatigue experimental device of above-mentioned VVT engine piston, described detection architecture comprises the orienting sleeve being connected on substrate, described orienting sleeve and sleeve concentric arrange, in described orienting sleeve, sliding plug has a test rod, one end of described test rod is fixed with propelling movement cylinder, the other end is towards coupling shaft, described test rod offers a blind hole towards one end of coupling shaft, in described blind hole, be provided with retainer spring and backstay, on described blind hole sidewall, offer vertically bar-shaped trough, on described backstay lateral wall, there is contiguous block, in backstay is plugged on blind hole time, contiguous block is slidably connected in bar-shaped trough, one end of described retainer spring is pressed on blind hole bottom surface, the other end is pressed on backstay insertion end end face, the external part end of described backstay is coniform, on the lateral wall of described adapter sleeve, radially offer a pilot hole, described pilot hole can be relative with backstay, on described test rod, be also arranged with the two detection dishes that can detect cylinder sleeve and test rod right alignment.Test rod and sleeve concentric, and backstay vertically points to the axial line of coupling shaft, need to detect right alignment time, cylinder sleeve is fixed in sleeve, push cylinder and promote test rod through cylinder sleeve, determine the right alignment of test rod and cylinder sleeve by detection dish, and then test rod points to adapter sleeve, backstay compresses in the pilot hole of adapter sleeve, if now pilot hole can not align with cylinder sleeve, the coniform end of backstay cannot be with pilot hole opening edge along laminating, need mobile link cover, treat position suitable, backstay is pressed in pilot hole in the effect of spring, and the coniform end sides of backstay and pilot hole opening edge are along laminating completely, after piston rod is connected on adapter sleeve.
In the fatigue experimental device of above-mentioned VVT engine piston, described detection dish has center pit, on the outer peripheral face of described detection dish, radially offer four through holes, these four through holes are circumferentially uniformly distributed, on the internal perisporium of described detection dish, radially offer four accommodation holes, described accommodation hole is respectively with the setting of through hole concentric and connect, the diameter of described through hole is less than the diameter of accommodation hole, in described accommodation hole, be provided with thrust spring and push pedal, in described through hole, slide to be inserted with and push pin, described one end of pushing pin is vertically connected in push pedal, the other end stretches out detection dish periphery wall, described detection dish can adsorb the ring electromagnet of push pedal be fixed with an energising on center bore inner wall time, the internal diameter of described electromagnet is consistent with test rod external diameter, and detection dish is located on test rod by this electromagnet sleeve, one end of described thrust spring is pressed on electromagnet lateral wall, the other end is pressed in push pedal.In the time that electromagnet is switched on, electromagnet can adsorb push pedal, push pin contracting in through hole, and because electromagnet has absorption affinity, therefore detection is coiled relative test rod and is had certain friction force, facilitate the location of detection dish on test rod, after detection dish moves on in cylinder sleeve, electromagnet power-off, the end of stretching out through hole and push pin under the effect of spring of pushing pin is pressed on inboard wall of cylinder liner, and on the lateral wall of pushing pin, be labeled with scale, detect the right alignment of test rod and cylinder sleeve with this.
Compared with prior art, the fatigue experimental device of this VVT engine piston has the following advantages:
1,, because this device is provided with right alignment detection architecture and adjustment structure, therefore can ensure that piston carries out torture test under coaxial operating mode with cylinder sleeve, guarantee the accuracy of test figure.
2, because the adjusting of right alignment is by Zhou Shang mechanism with put mechanism and coordinate to realize, coring need to regulate different parts, therefore uses conveniently, and degree of regulation is higher.
3, because locating piece is in fixing to adapter sleeve, stop nut and spring can position locating piece, and so many reorientation can be avoided adapter sleeve to become flexible and occur axial float.
4, because the axial line of coupling shaft and the axis linear distance of rotating shaft can regulate, therefore can be used in the piston rod model of different length, and stroke that can regulating piston motion.
5, because axial line, the axial line of screw two and the axial line of coupling shaft of screw one be not all on same straight line, avoid coupling shaft to occur the situation of rotation, make structure more stable.
6, because bolt all can move relative to sleeve with setscrew nut, therefore can be used in the cylinder sleeve of different length.
Brief description of the drawings
Fig. 1 is the perspective view figure of this fatigue experimental device.
Fig. 2 is the perspective view at another visual angle of this fatigue experimental device.
Fig. 3 is the structure enlarged drawing at B place in Fig. 2.
Fig. 4 is the partial structurtes cut-open view of this fatigue experimental device.
Fig. 5 is the structure enlarged drawing at A place in Fig. 1.
Fig. 6 is the perspective view of test rod.
Fig. 7 is the structure cut-open view of detection dish.
In figure, 1, frame; 11, substrate; 12, web joint; 2a, cam one; 21a, rotating shaft; 2b, cam two; 21b, grafting axle; 3, coupling shaft; 31, connecting portion; 32, threaded portion; 4, sleeve; 5, drives structure; 51, drive motor; 52, driving pulley; 53, driven pulley; 6, pitch adjusting structure; 61, adjusting bolt; 62, link slot; 63, run through groove; 7, Zhou Shang mechanism; 71, adapter sleeve; 711, pilot hole; 72, locating piece; 73, locking spring; 74, stop nut; 8, put mechanism; 81, gathering sill; 82, guide rail; 83, bolt; 84, positioning screw cap; 85, compress plate; 86, rubber layer; 9, detection architecture; 91, orienting sleeve; 92, test rod; 921, blind hole; 922, retainer spring; 923, bar-shaped trough; 93, detection dish; 931, through hole; 932, accommodation hole; 933, thrust spring; 934, push pedal; 935, push pin; 936, electromagnet; 94, backstay; 941, contiguous block; 95, push cylinder.
Embodiment
Be below specific embodiments of the invention by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiment.
As shown in Figure 1 and Figure 2, a kind of fatigue experimental device of VVT engine piston, comprise frame, in frame, be rotatably connected to cam one by rotating shaft, on the side of cam one, be vertically connected with one for connecting the coupling shaft of piston rod, between coupling shaft and cam, be provided with pitch adjusting structure, this pitch adjusting structure can regulate distance between coupling shaft axial line and rotating shaft core line.In frame, be fixed with one for placing the sleeve of cylinder sleeve, the axial line of sleeve and the axial line of coupling shaft are perpendicular, the drives structure that rotating shaft and can driving cam be rotated is connected, in frame, be also provided with detection architecture, this detection architecture can detect the right alignment of cylinder sleeve and piston, is provided with the adjustment structure that can regulate cylinder sleeve and piston coaxial degree on sleeve and coupling shaft.Between the axial line of rotating shaft and the axial line of coupling shaft, there is distance, therefore drives structure drive shaft is rotated, and then cam one rotates, coupling shaft can do taking rotating shaft as circle center of circle motion, and piston and piston rod are hinged, piston sliding plug is in cylinder sleeve, and coupling shaft swings with piston rod, under the constraint of cylinder sleeve, piston is realized along cylinder sleeve axially reciprocating simultaneously; Pitch adjusting structure can regulate the distance between coupling shaft axial line and rotating shaft core line, the radius of a circle that regulates coupling shaft to rotate, can realize the adjusting of piston movement stroke by this adjusting, also can make this device be applicable to the piston rod of different length, applicability is stronger; Cylinder sleeve is fixed in sleeve, piston rod is fixed on coupling shaft, position and the piston rod position on coupling shaft of cylinder sleeve in sleeve all can have influence on the right alignment between piston and cylinder sleeve, therefore before test, first coordinate adjustment structure to align with the assigned address on coupling shaft to the cylinder sleeve being fixed in sleeve by detection architecture, then piston rod is fixed on coupling shaft, thereby ensure the right alignment between piston and cylinder sleeve, make test figure more accurate.
Specifically, drives structure comprises a drive motor, frame comprises substrate, on substrate, be vertically fixed with two web joints, rotating shaft rotating shaft is connected on two web joints, a plate is stretched out in one end of rotating shaft, cam is connected in the external part end of rotating shaft, rotating shaft position between two web joints is fixed with a driven pulley, on drive motor, be fixed with driving pulley, driving pulley is connected by belt with driven pulley, when test, substrate is laid immediately on testing table, because needing piston, the torture test of piston moves for a long time, therefore adopt this comparatively stable and long power source of life-span of drive motor, driven pulley is connected by belt with driving pulley, therefore driven pulley can be subject to the tensile force of belt, rotating shaft connects by two web joints for this reason, and driven pulley is fixed on position between two web joints, ensure that rotating shaft is subject to the anchorage force of web joint even, avoid long-time process of the test shaft distortion.
Shown in Fig. 3, pitch adjusting structure comprises cam two and two adjusting bolts, on substrate, be fixed with a grafting axle, cam two is slidably located on grafting axle, grafting axle and rotating shaft concentric arrange, the link slot all offering on cam one two sides relative with cam two, link slot is radially offering along cam one and cam two respectively, the bottom land of link slot offers along its length and runs through groove, the width that runs through groove is less than the width of link slot, and the width that runs through groove is greater than the external diameter of coupling shaft, one end end face of coupling shaft offers screw one vertically, other end end face offers screw two vertically, the axial line of screw one, the axial line of screw two and the axial line of coupling shaft be not all on same straight line, the external diameter of coupling shaft is consistent with the width of link slot, an adjusting bolt is connected in screw one through running through groove spiral, another root adjusting bolt is connected in screw two through running through groove spiral, the two ends that are coupling shaft are slidably connected in link slot, need to be according to the length of throw of poston needs and piston rod, unclamp adjusting bolt, coupling shaft can move along link slot, after position suitable, screw adjusting bolt, adjusting bolt can be pressed on cam one and cam two two ends of coupling shaft, simultaneously because coupling shaft can be subject to circumferential acting force in process of the test, therefore coupling shaft easily occurs from then causes adjusting bolt loosening in process of the test, for this reason, the coupling shaft external diameter of this device is consistent with the width of link slot, axial line, the axial line of screw two and the axial line of coupling shaft of screw one be not all on same straight line simultaneously, avoid coupling shaft to occur the situation of rotation, make structure more stable, and cam two is set on grafting axle, after adjusting bolt is unclamped, cam two can move and depart from coupling shaft relative to the axle of pegging graft, and is now inserted in for piston rod.
Shown in Fig. 4, adjustment structure comprises Zhou Shang mechanism and put mechanism, and under the cooperation of detection architecture, axial means regulates the position of piston rod, puts mechanism the position of cylinder sleeve is regulated, and ensures the right alignment of piston and cylinder sleeve.Zhou Shang mechanism comprises that one for connecting adapter sleeve and the two column locating pieces of piston rod, coupling shaft comprises connecting portion and is positioned at the threaded portion at connecting portion two ends, on the periphery wall of threaded portion, there is external thread, the external diameter of connecting portion is greater than the external diameter of threaded portion, adapter sleeve is slidably located on connecting portion, locating piece offers threaded hole on one side, on opposite flank, offer spliced eye, spliced eye and threaded hole connect, and the internal diameter of spliced eye is consistent with the external diameter of connecting portion, two contiguous blocks are connected on the threaded portion at connecting portion two ends by threaded hole spiral respectively, and spliced eye is set on connecting portion, the side of some position piece is pressed on adapter sleeve end face, coupling shaft is all arranged with a locking spring and a stop nut on two threaded portions, one end of locking spring is pressed on locating piece, the other end is pressed on stop nut, connecting portion is roughly positioned at the axial middle part of coupling shaft, the threaded portion at two ends is used for connecting locating piece and stop nut, on adapter sleeve, there is the joint face matching with piston rod, certainly also can be with changing adapter sleeve according to the dissimilar of piston rod, adapter sleeve is set on connecting portion, rotation locating piece, make two locating pieces compress respectively the two ends end face of adapter sleeve, and show according to detection architecture, rotate the axial location that two locating pieces regulate adapter sleeve, after regulating, position fixes by two locating pieces, because locating piece is subject to the circumferential acting force of part of piston rod, therefore there will be a small amount of rotation, occur loosening for fear of locating piece rotation, on threaded portion, connect locking spring and stop nut, under the effect of locking spring, locating piece and stop nut are all compacted, avoid occurring rotation and become flexible.
Shown in Fig. 5, putting mechanism comprises and in sleeve lateral wall, offers vertically four gathering sills, these four gathering sills are circumferentially uniformly distributed, on the lateral wall of sleeve, also there are four guide rails, these four guide rails are relative with four gathering sills, in guide rail, all slide and be provided with two positioning screw caps or bolt, bolt is through setscrew nut and gathering sill, and the insertion end of bolt is fixed with one and compresses plate, the xsect that compresses plate is curved, compress on the side of plate and be fixed with rubber layer, cylinder sleeve screws bolt after inserting sleeve, the compressing plate and can be pressed on cylinder sleeve lateral wall of bolt head, and rubber layer can reduce the stress that cylinder sleeve lateral wall is subject to and concentrates, avoid breaking, only can regulate the position of cylinder sleeve in sleeve according to detection architecture vision-control bolt simultaneously, cylinder sleeve is alignd with the specified point on adapter sleeve, and bolt and setscrew nut can move while unclamping in gathering sill, can be applicable to the cylinder sleeve of different length.
Shown in Fig. 6, detection architecture comprises the orienting sleeve being connected on substrate, orienting sleeve and sleeve concentric arrange, in orienting sleeve, sliding plug has a test rod, one end of test rod is fixed with propelling movement cylinder, the other end is towards coupling shaft, test rod offers a blind hole towards one end of coupling shaft, in blind hole, be provided with retainer spring and backstay, on blind hole sidewall, offer vertically bar-shaped trough, on backstay lateral wall, there is contiguous block, in backstay is plugged on blind hole time, contiguous block is slidably connected in bar-shaped trough, one end of retainer spring is pressed on blind hole bottom surface, the other end is pressed on backstay insertion end end face, the external part end of backstay is coniform, on the lateral wall of adapter sleeve, radially offer a pilot hole, pilot hole can be relative with backstay, on test rod, be also arranged with the two detection dishes that can detect cylinder sleeve and test rod right alignment, test rod and sleeve concentric, and backstay vertically points to the axial line of coupling shaft, need to detect right alignment time, cylinder sleeve is fixed in sleeve, push cylinder and promote test rod through cylinder sleeve, determine the right alignment of test rod and cylinder sleeve by detection dish, and then test rod points to adapter sleeve, backstay compresses in the pilot hole of adapter sleeve, if now pilot hole can not align with cylinder sleeve, the coniform end of backstay cannot be with pilot hole opening edge along laminating, need mobile link cover, treat position suitable, backstay is pressed in pilot hole in the effect of spring, and the coniform end sides of backstay and pilot hole opening edge are along laminating completely, after piston rod is connected on adapter sleeve.
Shown in Fig. 7, detection dish has center pit, on the outer peripheral face of detection dish, radially offer four through holes, these four through holes are circumferentially uniformly distributed, on the internal perisporium of detection dish, radially offer four accommodation holes, accommodation hole is respectively with the setting of through hole concentric and connect, the diameter of through hole is less than the diameter of accommodation hole, in accommodation hole, be provided with thrust spring and push pedal, in through hole, slide to be inserted with and push pin, the one end of pushing pin is vertically connected in push pedal, the other end stretches out detection dish periphery wall, when being fixed with an energising on center bore inner wall, detection dish can adsorb the ring electromagnet of push pedal, the internal diameter of electromagnet is consistent with test rod external diameter, and detection dish is located on test rod by this electromagnet sleeve, one end of thrust spring is pressed on electromagnet lateral wall, the other end is pressed in push pedal, in the time that electromagnet is switched on, electromagnet can adsorb push pedal, push pin contracting in through hole, and because electromagnet has absorption affinity, therefore detection is coiled relative test rod and is had certain friction force, facilitate the location of detection dish on test rod, after detection dish moves on in cylinder sleeve, electromagnet power-off, the end of stretching out through hole and push pin under the effect of spring of pushing pin is pressed on inboard wall of cylinder liner, and on the lateral wall of pushing pin, be labeled with scale, detect the right alignment of test rod and cylinder sleeve with this.
Claims (8)
1. the fatigue experimental device of a VVT engine piston, comprise frame, it is characterized in that, in described frame, be rotatably connected to cam one by rotating shaft, on the side of described cam one, be vertically connected with one for connecting the coupling shaft of piston rod, between described coupling shaft and cam, be provided with the pitch adjusting structure that can regulate distance between coupling shaft axial line and rotating shaft core line, in described frame, be fixed with one for placing the sleeve of cylinder sleeve, the axial line of described sleeve and the axial line of coupling shaft are perpendicular, the drives structure that described rotating shaft and can driving cam be rotated is connected, in described frame, be also provided with the detection architecture that can detect cylinder sleeve and piston coaxial degree, on sleeve and coupling shaft, be provided with the adjustment structure that can regulate cylinder sleeve and piston coaxial degree.
2. the fatigue experimental device of VVT engine piston according to claim 1, it is characterized in that, described drives structure comprises a drive motor, described frame comprises substrate, on described substrate, be vertically fixed with two web joints, described rotating shaft rotating shaft is connected on two web joints, a plate is stretched out in one end of rotating shaft, above-mentioned cam is connected in the external part end of rotating shaft, described rotating shaft position between two web joints is fixed with a driven pulley, on described drive motor, be fixed with driving pulley, described driving pulley is connected by belt with driven pulley.
3. the fatigue experimental device of VVT engine piston according to claim 2, it is characterized in that, described pitch adjusting structure comprises cam two and two adjusting bolts, on described substrate, be fixed with a grafting axle, described cam two is slidably located on grafting axle, described grafting axle and rotating shaft concentric arrange, the link slot all offering on described cam one two sides relative with cam two, described link slot is radially offering along cam one and cam two respectively, the bottom land of described link slot offers along its length and runs through groove, the described width that runs through groove is less than the width of link slot, and the width that runs through groove is greater than the external diameter of coupling shaft, one end end face of described coupling shaft offers screw one vertically, other end end face offers screw two vertically, the axial line of described screw one, the axial line of screw two and the axial line of coupling shaft be not all on same straight line, the external diameter of described coupling shaft is consistent with the width of link slot, an adjusting bolt is connected in screw one through running through groove spiral, another root adjusting bolt is connected in screw two through running through groove spiral.
4. the fatigue experimental device of VVT engine piston according to claim 3, is characterized in that, described adjustment structure comprise Zhou Shang mechanism that can the position of regulating piston bar on coupling shaft and can regulate and stationary housing put mechanism.
5. the fatigue experimental device of VVT engine piston according to claim 4, it is characterized in that, described Zhou Shang mechanism comprises that one for connecting adapter sleeve and the two column locating pieces of piston rod, described coupling shaft comprises connecting portion and is positioned at the threaded portion at connecting portion two ends, on the periphery wall of described threaded portion, there is external thread, the external diameter of described connecting portion is greater than the external diameter of threaded portion, described adapter sleeve is slidably located on connecting portion, described locating piece offers threaded hole on one side, on opposite flank, offer spliced eye, described spliced eye and threaded hole connect, and the internal diameter of spliced eye is consistent with the external diameter of connecting portion, described two contiguous blocks are connected on the threaded portion at connecting portion two ends by threaded hole spiral respectively, and spliced eye is set on connecting portion, the side of some position piece is pressed on adapter sleeve end face, described coupling shaft is all arranged with a locking spring and a stop nut on two threaded portions, one end of described locking spring is pressed on locating piece, the other end is pressed on stop nut.
6. the fatigue experimental device of VVT engine piston according to claim 4, it is characterized in that, the described mechanism that puts comprises and in sleeve lateral wall, offers vertically four gathering sills, these four gathering sills are circumferentially uniformly distributed, on the lateral wall of sleeve, also there are four guide rails, these four guide rails are relative with four gathering sills, in described guide rail, all slide and be provided with two positioning screw caps or bolt, described bolt is through setscrew nut and gathering sill, and the insertion end of bolt is fixed with one and compresses plate, the described xsect that compresses plate is curved, on the described side that compresses plate, be fixed with rubber layer.
7. according to the fatigue experimental device of the VVT engine piston described in claim 5 or 6, it is characterized in that, described detection architecture comprises the orienting sleeve being connected on substrate, described orienting sleeve and sleeve concentric arrange, in described orienting sleeve, sliding plug has a test rod, one end of described test rod is fixed with propelling movement cylinder, the other end is towards coupling shaft, described test rod offers a blind hole towards one end of coupling shaft, in described blind hole, be provided with retainer spring and backstay, on described blind hole sidewall, offer vertically bar-shaped trough, on described backstay lateral wall, there is contiguous block, in backstay is plugged on blind hole time, contiguous block is slidably connected in bar-shaped trough, one end of described retainer spring is pressed on blind hole bottom surface, the other end is pressed on backstay insertion end end face, the external part end of described backstay is coniform, on the lateral wall of described adapter sleeve, radially offer a pilot hole, described pilot hole can be relative with backstay, on described test rod, be also arranged with the two detection dishes that can detect cylinder sleeve and test rod right alignment.
8. the fatigue experimental device of VVT engine piston according to claim 7, it is characterized in that, described detection dish has center pit, on the outer peripheral face of described detection dish, radially offer four through holes, these four through holes are circumferentially uniformly distributed, on the internal perisporium of described detection dish, radially offer four accommodation holes, described accommodation hole is respectively with the setting of through hole concentric and connect, the diameter of described through hole is less than the diameter of accommodation hole, in described accommodation hole, be provided with thrust spring and push pedal, in described through hole, slide to be inserted with and push pin, described one end of pushing pin is vertically connected in push pedal, the other end stretches out detection dish periphery wall, described detection dish can adsorb the ring electromagnet of push pedal be fixed with an energising on center bore inner wall time, the internal diameter of described electromagnet is consistent with test rod external diameter, and detection dish is located on test rod by this electromagnet sleeve, one end of described thrust spring is pressed on electromagnet lateral wall, the other end is pressed in push pedal.
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| CN106197357A (en) * | 2016-07-21 | 2016-12-07 | 赵艳丽 | Electric power steel tube inner hole fixing device |
| CN107424497A (en) * | 2017-08-25 | 2017-12-01 | 深圳市应孕而生健康管理有限公司 | A kind of diagnosis by feeling the pulse simulator and simulation blood supply device |
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| CN109128600A (en) * | 2018-09-26 | 2019-01-04 | 格力电器（郑州）有限公司 | A kind of automatic soldering device and its production line |
| CN114485514A (en) * | 2021-12-31 | 2022-05-13 | 北京航天益森风洞工程技术有限公司 | Life test bed and life test method for displacement sensor |
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| CN114485514A (en) * | 2021-12-31 | 2022-05-13 | 北京航天益森风洞工程技术有限公司 | Life test bed and life test method for displacement sensor |
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