CN103217294B - Zero point judgment and control mechanism for valve stroke of internal combustion engine air flue current stabilization test bed - Google Patents
Zero point judgment and control mechanism for valve stroke of internal combustion engine air flue current stabilization test bed Download PDFInfo
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- CN103217294B CN103217294B CN201310089038.6A CN201310089038A CN103217294B CN 103217294 B CN103217294 B CN 103217294B CN 201310089038 A CN201310089038 A CN 201310089038A CN 103217294 B CN103217294 B CN 103217294B
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Abstract
The invention discloses a zero point judgment and control mechanism for a valve stroke of an internal combustion engine air flue current stabilization test bed. According to the technical scheme, the zero point judgment and control mechanism is formed by combination of two vertical plates, extension shafts of two transverse linear stepping motors, and a transverse arm, wherein a gantry type frame is formed above a work table top, and a hydraulic cylinder shaft enables the frame to shift up and down. Steering motors are fixed on connecting blocks of the extension shafts of the transverse linear stepping motors, cylindrical gear plates are welded with transverse arm short shafts, and the steering motors drive the gear plates and gears to enable the transverse arm to rotate. Two longitudinal linear stepping motors are fixed on the transverse arm, a sensor upper sleeve and a sensor lower sleeve are connected with the lower ends of the extension shafts of the motors, a guiding sliding sleeve, a lower ejector rod and a pressure sensor are arranged in each sleeve, each pressure sensor is contacted with the top face of each guiding sliding sleeve to output signals to a computer to detect through displacement of each lower ejector rod. The mechanism not only can eliminate manual installation and disassembling operation of a cylinder cover pressing plate, the valve stroke is high in control precision, and zero point judgment can be carried out on cylinder covers of different kinds of valve spring pre-tightening force.
Description
Technical field
The invention belongs to engine performance parameter detecting technology, be specifically related to a kind of experiment detection device that engine valve position or lift displacement are measured and controlled.
Background technology
Well-known internal combustion engine is the maximum industry of consumption of petroleum, accounts for 60% of China's oil total flow; The discharge of motor vehicle simultaneously more exacerbates the deterioration of urban environment, and therefore the innovation of combustion motor energy-conserving and emission-cutting technology is significant.The air flue of internal combustion engine as " throat ", the good and bad appreciable impact oil consumption of its flowing property and emission level.For the power, economy and the emission performance that make internal combustion engine reach good, precondition is that air flue must can realize sufficiently high coefficient of flow and suitable swirl ratio, Tumble and swirl etc.Influence factor due to dynamic evaluation air passage of internal combustion engine performance is many and be difficult to control, and therefore utilizing air passage of internal combustion engine, steady flow testbed to carry out evaluation and test to air port performance be extensively adopt parallel effective method.When carrying out human bronchial epithelial cells, first need to carry out aligning and compressing debugging of valve, need subsequently to set different valve strokes in continuous or interrupted mode, the accuracy that the stability of valve hold-down mechanism and valve stroke control will have influence on the test result of parameter.
In current air passage of internal combustion engine is steady flow testbed, valve compresses and lift controlling mechanism mainly contains three kinds of forms: (1) adopts pad to regulate valve stroke, is regulated by the pad of different-thickness.Which destroys the integrality of air valve structure, and pad Long-Time Service causes valve stroke to judge and control accuracy reduction zero point because wearing and tearing; (2) adopt pointer dial gauge and the mode of pressing plate is installed.Although this kind of mode compensate for the defect of first method, valve stroke judges that the subjective impact of still tested person personnel is comparatively large zero point, causes front and back test error variation obviously; (3) adopt turbine and worm multiple-degree-of-freedom mechanism, by turbine and worm transmission, valve stroke is accurately controlled.This kind of mode still by pressing plate fixation measuring device, and need judge the experience being still limited by tester zero point, and precision is low and be difficult to control.The operating process of aforesaid way is except comparatively loaded down with trivial details, when testing difference cylinder, need tester manually to change pressing plate, this can cause test macro can not adapt to the beat of engine cylinder cover on-line checkingi, limits the raising of steady flow testbed of air passage test job efficiency.
Along with the raising of the performance requirement to engine cylinder cover entering and exhaust channel, require to detect one by one each performance on a production line, this just in the urgent need to develop a kind of job stability high, fast automaticly can carry out valve and align and compress, accurately control the device of valve stroke to adapt to steady flow testbed of air passage on-line checkingi beat.Proposition of the present invention can meet the requirement to the online high precision test of engine cylinder cover.
Summary of the invention
The object of the invention is, when carrying out the test of air passage of internal combustion engine current stabilization, provide one automatically can carry out valve positioning compression, accurately judge valve stroke null position and control gear.
Below with reference to accompanying drawing, technical pattern of the present invention and principle are described.Air passage of internal combustion engine steady flow testbed valve stroke judges and control gear zero point, comprise work top, riser, horizontal linear stepping motor, linear bearing, the extending shaft of horizontal linear stepping motor, contiguous block, transverse arm, upper junction plate, gusset, hydraulic cylinder, guide pillar, lower connecting plate, steer motor, spur gear wheel, Cylinder Gear wheel disc, longitudinal linear stepping motor, the extending shaft of longitudinal linear stepping motor, sensor overlaps, sensor is trapped, guide sleeve, holddown spring, pressure transducer, retracing spring, lower push rod, depression bar, cylinder cap, support set, pressing plate and terminal pad etc.By compressing structure frame assembly and zero point, control gear judges that assembly two large divisions forms, compressing structure frame assembly by: hydraulic cylinder, linear guide poles, upper and lower two pieces of web joints, gantry type frame, two horizontal linear stepping motors, contiguous block, steer motor, spur gear wheel, Cylinder Gear wheel disc and two longitudinal linear stepping motor parts form; Valve stroke to judge zero point assembly by: sensor upper bush, sensor lower sleeve, guide sleeve, holddown spring, pressure transducer, retracing spring and lower push rod parts form.
Technical scheme of the present invention is: work top is provided with two pieces of risers, the outer end of left side vertical plate is provided with two horizontal linear stepping motors, the position that right side riser is relative with the horizontal linear stepping motor in two, left side is provided with linear bearing, and the extending shaft of horizontal linear stepping motor crouches in the linear bearing of right side riser through left side vertical plate edge.The extending shaft of horizontal stepper motor is welded with contiguous block, and the two ends of transverse arm are welded with minor axis, and transverse arm minor axis is connected with two horizontal linear stepping motor extending shafts by contiguous block.Combined by the extending shaft of two pieces of risers, two horizontal linear stepping motors and transverse arm, above work top, form a gantry type frame.The outside of two pieces of risers is all welded with upper junction plate, and riser and upper junction plate are welded as a whole by gusset.The axle of hydraulic cylinder and the guide pillar of both sides are fixed through work top and lower connecting plate, and hydraulic cylinder holds up upper and lower web joint can make gantry type frame upper and lower displacement.Steer motor is fixed on contiguous block, and steer motor is connected with spur gear wheel, and Cylinder Gear wheel disc welds with the intermediate shaft of transverse arm, and Cylinder Gear wheel disc engages with spur gear wheel, and steer motor drives spur gear wheel to make transverse arm rotation.Two longitudinal linear stepping motors are fixed on transverse arm, and two horizontal linear stepping motors synchronously drive respective extending shaft to produce axial displacement, drive transverse arm to produce transverse movement thus.The extending shaft lower end of longitudinal linear stepping motor is connected on sensor by screw thread to be overlapped, and sensor is trapped fixing by screw and sensor overlap.Sensor is provided with guide sleeve in trapping, guide sleeve penetrates in holddown spring, and pressure transducer is nested with retracing spring, and retracing spring overlaps between guide sleeve on sensor, guide sleeve is connected with lower push rod by screw thread, and lower push rod and depression bar are connected by screw.Cylinder cap to be tested is placed at the center of work top, and cylinder cap support set is fixed by pressing plate and terminal pad, and cylinder cap is fixed on cylinder cap support set upper surface.
Compressing structure frame assembly possesses four degree of freedom: the displacement of the lines of the displacement of the lines of the extending shaft of gantry type frame upper and lower displacement, horizontal linear stepping motor, transverse arm corner displacement and longitudinal linear stepping motor extending shaft.Can position any cylinder head valve thus and operate with compression.
Beneficial effect of the present invention is: (1) can be evaluated and tested the air port performance of multicylinder engine, and it is little that pick-up unit has volume, compact conformation, easy for installation, automaticity high; (2) this device coordinates with cylinder cap auto feed system, can realize unmanned full-automatic on-line checkingi of interfering, and reduces human factor to the impact of test result, improves measuring accuracy; (3) pressure transducer range ability is large, null position decision errors can be controlled, within ± 0.05mm, can carry out judgement at zero point to the cylinder cap of various different air valve initial tension of spring simultaneously, applied widely; (4) artificial installation and the dismantlement work of cylinder cap pressing plate can be saved.
Accompanying drawing explanation
Accompanying drawing 1 is technical pattern of the present invention and schematic diagram.
Accompanying drawing 2 is the close-up schematic view of transverse arm corner displacement governor motion.
Accompanying drawing 3 is valve stroke null position judgement assembly diagrammatic cross-section.
Embodiment
Structure of the present invention and principle to be described further by embodiment below in conjunction with accompanying drawing.
Air passage of internal combustion engine steady flow testbed valve stroke judges and control gear zero point, its parts composition and technical pattern are: work top 1 is provided with two pieces of risers 2, the outer end of left side vertical plate is provided with two horizontal linear stepping motors 3, the position that right side riser is relative with the horizontal linear stepping motor in two, left side is provided with linear bearing 4, and the extending shaft 5 of horizontal linear stepping motor crouches in the linear bearing of right side riser through left side vertical plate edge.The extending shaft of horizontal stepper motor is welded with contiguous block 6, and the two ends of transverse arm 7 are welded with minor axis, and transverse arm minor axis is connected with two horizontal linear stepping motor extending shafts by contiguous block.Combined by the extending shaft of two pieces of risers, two horizontal linear stepping motors and transverse arm, above work top, form a gantry type frame.The outside of two pieces of risers is all welded with upper junction plate 8, and riser and upper junction plate are welded as a whole by gusset 9 again.The axle of hydraulic cylinder 10 and the guide pillar 11 of both sides are fixed through work top and lower connecting plate 12, and hydraulic cylinder holds up upper and lower web joint can make gantry type frame upper and lower displacement (as Fig. 1).
Steer motor 13 is fixed on contiguous block, and steer motor is connected with spur gear wheel 14, and Cylinder Gear wheel disc 15 welds with the minor axis of transverse arm side, and Cylinder Gear wheel disc engages with spur gear wheel, and steer motor drives spur gear wheel to make transverse arm rotation.Two longitudinal linear stepping motors 16 are fixed on transverse arm, and two horizontal linear stepping motors synchronously drive respective extending shaft to produce axial displacement, drive transverse arm to produce transverse movement (as Fig. 2) thus.
Extending shaft 17 lower end of longitudinal linear stepping motor is connected on sensor by screw thread overlaps 18, and sensor is trapped and 19 to be fixed by screw and sensor overlap.Sensor is provided with guide sleeve 20 in trapping, and guide sleeve penetrates in holddown spring 21, and pressure transducer 22 is nested with retracing spring 23, and retracing spring overlaps between guide sleeve on sensor.Guide sleeve is connected with lower push rod 24 by screw thread, and lower push rod and depression bar 25 are connected by screw (as Fig. 3).
Cylinder cap 26 to be tested is placed at the center of work top, and cylinder cap support set 27 is fixed by pressing plate 28 and terminal pad 29, and cylinder cap is fixed on cylinder cap support set upper surface (as Fig. 1).Pressure transducer is loop configuration, and sensor is affixed on sensor and overlaps, and lower push rod chassis is had four holes and is connected with depression bar by screw.Valve stroke judges that assembly can realize moving back and forth along valve stem axis direction zero point.
By compressing structure frame assembly and zero point, control gear judges that assembly two large divisions forms, compressing structure frame assembly by: hydraulic cylinder 10, linear guide poles 11, upper and lower two pieces of web joints, gantry type frame, two horizontal linear stepping motors 3, contiguous block 6, steer motor 13, spur gear wheel 14, Cylinder Gear wheel disc 15 and two longitudinal linear stepping motor 16 parts form.When carrying out engine air passage flow stabilizing test, need the pretightning force overcoming valve spring just can open head valve, the compressing structure frame assembly of control gear is exactly design for this reason.
Valve stroke to judge zero point assembly by: sensor upper bush 18, sensor lower sleeve 19, guide sleeve 20, holddown spring 21, pressure transducer 22, retracing spring 23 and lower push rod 24 parts form, and synchronously drive judge component movement zero point by two longitudinal linear stepping motors.
Hydraulic cylinder 10 is positioned at below work top 1, and the both sides of hydraulic cylinder are provided with guide pillar seat, and guide pillar 11 is fixed on guide pillar seat, and upper lower connecting plate is fixed by screw thread.For the ease of assembling two longitudinal linear stepping motors, transverse arm 7 is designed to tower structure.Riser is provided with mounting hole for installing other Control Component.
Cylinder head is fixed on above cylinder cap support set during test, valve to be measured is corrected and compresses debugging.Corresponding for valve top three dimensional space coordinate is input to computing machine, and computing machine is by driving hydraulic cylinder and each motor moves to realize longitudinal linear stepping motor extending shaft in each degree of freedom and valve position to be measured aligns.
Longitudinal linear stepping motor drives judge that assembly moves downward along valve stem axis direction zero point.Make lower push rod vertically be pressed into and to open valve, embodiment head valve pretightning force is 40kg.Pressure threshold value in computer-controlled program is set as 30kg, and computing machine will drive longitudinal linear stepping motor extending shaft to move downward, thus lower push rod is contacted with valve.Along with lower push rod compresses valve gradually, the gap between guide sleeve and pressure transducer constantly diminishes, until the complete compaction pressure sensor of guide sleeve.When the pressure signal value that pressure transducer records is increased to 30kg, computing machine will this moment position as valve stroke null position, and drive longitudinal linear stepping motor start numeration measure.
After whole test process terminates, longitudinal linear stepping motor extending shaft drives valve stroke to judge that assembly does upwards drawback movement zero point.After valve is closed completely, the gap between guide sleeve cylinder and pressure transducer returns to original state, and namely this process completes a complete test loop.
Claims (4)
1. air passage of internal combustion engine steady flow testbed valve stroke judges and control gear zero point, comprises work top, riser, horizontal linear stepping motor, linear bearing, the extending shaft of horizontal linear stepping motor, contiguous block, transverse arm, upper junction plate, gusset, hydraulic cylinder, guide pillar, lower connecting plate, steer motor, spur gear wheel, Cylinder Gear wheel disc, longitudinal linear stepping motor, the extending shaft of longitudinal linear stepping motor, sensor overlaps, sensor is trapped, guide sleeve, holddown spring, pressure transducer, retracing spring, lower push rod, depression bar, cylinder cap, support set, pressing plate and terminal pad, it is characterized in that: work top (1) is provided with two pieces of risers (2), the outer end of left side vertical plate is provided with two horizontal linear stepping motors (3), the position that right side riser is relative with the horizontal linear stepping motor in two, left side is provided with linear bearing (4), the extending shaft (5) of horizontal linear stepping motor crouches in the linear bearing of right side riser through left side vertical plate edge, the extending shaft of horizontal stepper motor is welded with contiguous block (6), the two ends of transverse arm (7) are welded with minor axis, transverse arm minor axis is connected with two horizontal linear stepping motor extending shafts, by two pieces of risers by contiguous block, extending shaft and the transverse arm of two horizontal linear stepping motors are combined, a gantry type frame is formed above work top, the outside of two pieces of risers is all welded with upper junction plate (8), riser and upper junction plate are welded as a whole by gusset (9) again, the axle of hydraulic cylinder (10) and the guide pillar (11) of both sides are fixed, under hydraulic cylinder holds up through work top and lower connecting plate (12), upper junction plate can make gantry type frame upper and lower displacement, steer motor (13) is fixed on contiguous block, steer motor is connected with spur gear wheel (14), Cylinder Gear wheel disc (15) welds with the minor axis of transverse arm side, Cylinder Gear wheel disc engages with spur gear wheel, steer motor drives spur gear wheel to make transverse arm rotation, two longitudinal linear stepping motors (16) are fixed on transverse arm, two horizontal linear stepping motors synchronously drive respective extending shaft to produce axial displacement, transverse arm is driven to produce transverse movement thus, extending shaft (17) lower end of longitudinal linear stepping motor is connected on sensor by screw thread overlaps (18), it is fixing by screw and sensor overlap that sensor is trapped (19), sensor is provided with guide sleeve (20) in trapping, guide sleeve penetrates in holddown spring (21), pressure transducer (22) is nested with retracing spring (23), retracing spring overlaps between guide sleeve on sensor, guide sleeve is connected with lower push rod (24) by screw thread, lower push rod and depression bar (25) are connected by screw, cylinder cap (26) to be tested is placed at the center of work top, cylinder cap support set (27) is fixed by pressing plate (28) and terminal pad (29), cylinder cap is fixed on cylinder cap support set upper surface.
2. judge and control gear zero point according to air passage of internal combustion engine according to claim 1 steady flow testbed valve stroke, it is characterized in that by compressing structure frame assembly and zero point, described control gear judges that assembly two large divisions forms, compressing structure frame assembly is by described: hydraulic cylinder (10), guide pillar (11), upper junction plate (8), lower connecting plate (12), gantry type frame, two horizontal linear stepping motors (3), contiguous block (6), steer motor (13), spur gear wheel (14), Cylinder Gear wheel disc (15) and two longitudinal linear stepping motor (16) parts compositions, valve stroke judges that assembly is by described zero point: sensor overlaps (18), sensor is trapped (19), guide sleeve (20), holddown spring (21), pressure transducer (22), retracing spring (23) and lower push rod (24) parts form, and synchronously drives judge component movement zero point by two longitudinal linear stepping motors.
3. judge and control gear zero point according to air passage of internal combustion engine according to claim 1 steady flow testbed valve stroke, it is characterized in that described hydraulic cylinder (10) is positioned at below work top (1), the both sides of hydraulic cylinder are provided with guide pillar seat, and described guide pillar (11) is fixed on guide pillar seat.
4. judge and control gear zero point according to air passage of internal combustion engine according to claim 1 steady flow testbed valve stroke, it is characterized in that described transverse arm (7) is tower structure; Described pressure transducer (22) is loop configuration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310089038.6A CN103217294B (en) | 2013-03-20 | 2013-03-20 | Zero point judgment and control mechanism for valve stroke of internal combustion engine air flue current stabilization test bed |
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| CN201310089038.6A CN103217294B (en) | 2013-03-20 | 2013-03-20 | Zero point judgment and control mechanism for valve stroke of internal combustion engine air flue current stabilization test bed |
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| CN103217294B true CN103217294B (en) | 2015-06-03 |
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| CN104848824B (en) * | 2014-12-17 | 2017-12-08 | 北汽福田汽车股份有限公司 | A kind of valve swings the measurement apparatus and measuring method in gap |
| CN111811448B (en) * | 2020-07-27 | 2021-10-22 | 延锋伟世通汽车电子有限公司 | Motor mechanical zero-position double-hole testing device and method |
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| JP5799682B2 (en) * | 2011-09-05 | 2015-10-28 | 株式会社デンソー | Air flow measurement device |
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