EP0407302A1 - Verfahren zum Einstellen des Ventilspiels bei Brennkraftmaschinen und Einrichtung zur Durchführung dieses Verfahrens - Google Patents
Verfahren zum Einstellen des Ventilspiels bei Brennkraftmaschinen und Einrichtung zur Durchführung dieses Verfahrens Download PDFInfo
- Publication number
- EP0407302A1 EP0407302A1 EP90401948A EP90401948A EP0407302A1 EP 0407302 A1 EP0407302 A1 EP 0407302A1 EP 90401948 A EP90401948 A EP 90401948A EP 90401948 A EP90401948 A EP 90401948A EP 0407302 A1 EP0407302 A1 EP 0407302A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- adjusting screw
- shim
- rotation
- seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims description 10
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 8
- 230000015654 memory Effects 0.000 claims description 6
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 5
- 239000002033 PVDF binder Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims description 5
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims description 2
- 210000000056 organ Anatomy 0.000 claims description 2
- 230000000284 resting effect Effects 0.000 claims description 2
- 239000000523 sample Substances 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 230000008569 process Effects 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
Definitions
- the present invention relates to a method of adjusting the play of the rocker arms of an internal combustion engine, and an apparatus for implementing this method.
- the assembly formed by the control cam, or the control member, of rocker assembly and the valve moves between two extreme positions, one where the valve is forced, under the action of the cam, to s '' move as far away from its seat (maximum lifting position) and the other where the valve is pushed by a spring against its seat, and where there is, between the cam and the rocker clearance, or in the rocker assembly , or between it and the valve, maximum play (maximum play position).
- This play which can be of the order of 0.1 to 0.3 mm, is essential to compensate for the effect of the differences in expansion, but it must remain within defined limits for proper operation of the engine.
- the operation is done in principle cold with a thickness gauge and the clearance is adjusted by modifying the length of one of the parts of the rocker assembly which comprises, for this purpose, a head mounted on an adjustment screw provided with a locking nut.
- This head when the clearance is zero, comes to bear, depending on the type of engine, on the cam, on the valve, or on another part of the rocker assembly.
- the operation when done manually, involves bringing the camshaft into the maximum play position, measuring the play, and, after loosening the lock nut, turning the screw at an angle suitable for bring the play to the desired limits, then tighten the lock nut.
- Document DE-A-30 02 015 has proposed a process which lends itself to automation, and which comprises the following operations: a detector sensitive to the position of the valve relative to the engine block, that is to say to the seat of the valve, is installed, and a device for controlling the rotation of the adjusting screw, - after having released the locking nut and brought the rocker arm to the position which corresponds to the maximum clearance, the detector locates the zero point, where the valve rests on its seat, - the adjustment screw is advanced until the sensor signals that the valve is lifted by a height x1 on its seat, - the adjustment screw is moved back until the sensor signals that the valve is lifted by a height x2, between O and x, and - the adjustment screw is moved back by rotation by an angle corresponding to the distance x2 + x3, x3 being the desired clearance.
- This apparatus includes a sensor capable of continuously grasping the displacements of the valve, this sensor is carried by a base on which is also fixed the motor for which it is a question of adjusting the valves, and it is provided with a sensor which comes to bear on a cup secured to the valve stem.
- the apparatus further comprises two tools, each driven by a motor, and arranged to drive in rotation one, the adjusting screw, and the other, the locking nut.
- the object of the present invention is to provide an automated process for adjusting valves which provides greater precision than that of the known method, and which makes it possible to use less expensive equipment.
- camshaft is meant here not only a camshaft of the current type but any device intended to mechanically move the valve according to a defined law.
- the same successive displacements of the adjusting screw are carried out as in DE-A-3 002 015, but the sensor does not determine the "zero point", where the valve rests on its seat, before the valve moves away from its seat. On the contrary, it determines this "zero point” during the reversing stroke, when the valve stops because it comes to rest on its seat and it is this "zero point" which serves as a point of start with the measurement of the angle of rotation which corresponds to the desired clearance.
- a shim of known thickness is introduced with precision between the adjustment screw and the element of the rocker assembly against which said adjustment screw comes to bear, by placing said shim perpendicular to the 'axis of the adjusting screw, in step g), the adjusting screw is printed with a complementary rotation which corresponds to the desired clearance, minus the angular value which corresponds to the thickness of the shim, - and the shim is removed after step g).
- a wedge is a plate of solid material, bounded by two flat and parallel surfaces between them. Therefore, when the adjusting screw and the rocker element are in contact with the shim, the distance between them is fixed with precision, and cannot be affected by the relative position of the axes.
- the improvement in precision comes from the high quality of the wedge surfaces that can be obtained.
- the device for determining the position of the valve provided in step a) consists of the shim itself, the latter being associated with means for detecting the moment when it comes into simultaneous contact with the adjusting screw and said element of the rocker assembly, and the moment when said contact simultaneous ceases.
- the shim has an electrically insulating central part and two opposite conductive faces, the adjusting screw and said element of the rocker assembly with the same electrical potential, at least one of said opposite faces of the shim is brought to a different potential when it is not in contact with the adjusting screw or said element, and a sensor detects the moment when said face of the shim changes potential with respect to the adjusting screw and said element of the 'together.
- a shim comprising a layer of metallized polyvinylidene fluoride on its two faces, these being insulated from the outside by layers of insulating material. and the two metallized faces being connected to an electrical voltage sensor.
- provision may be made for the shim to be printed with oscillations in its plane, and the arrest of these oscillations is detected, which corresponds to the tightening of the shim between the adjusting screw and said element.
- the invention also provides an apparatus for implementing the above method, and which comprises: - a device, comprising a sensor capable of detecting the zero point, where the valve comes into contact with its seat, - a device for controlling the rotation of the adjusting screw, this device being characterized in that it further comprises a central control member, connected to the rotation control device and to the sensor, this member being arranged to control in step e) the rotation of the adjusting screw in a first direction along a first angle previously stored in memory, then, in step f), in the opposite direction until detection using the signals emitted by the sensor, of the stop of the movement of the valve, and then, after said stop detection, at a second angle, corresponding to the game, and previously stored in memory, to carry out step g).
- the device for controlling the rotation of the adjusting screw comprises a stepping motor, and the instructions of the control member are stored and transmitted in the form of the number of steps of said motor.
- a quasi-continuous displacement sensor is used, it is advantageously provided that the latter is of the incremental type, and transmits in digital form the signals transmitted to the control unit.
- the accuracy can be improved with respect to the apparatus of document DE-A-30 02 015, by providing a feeler mounted movably on the support and provided with a button intended to come into contact with the seat of the valve or with a part which is rigidly linked to it, the sensor being linked to one of the feelers and its sensitive member being in contact with the other.
- the feelers are pivotally mounted on the support, a spring bearing on the support pushing one of the feelers to bring it into contact with the part on which its key must come to rest, and the other feeler being controlled by a jack mounted on the first support, the latter feeler being provided with an auxiliary member capable of driving the other feeler to put it out of action during assembly or disassembly of the support.
- This cylinder can also be controlled by the central control member, for example by means of a solenoid valve.
- FIG. 1 shows the division of the apparatus between three units: the central control member 1, the screwing device 2 of the adjusting screw and the locking nut, and the device 3 for detecting movements of the valve.
- FIG. 2 shows the detail of the screwing device.
- a frame 10 provided with means not shown for fixing relative to the engine block, carries two coaxial sleeves 11 and 12, which can rotate independently of each other relative to the frame 10 by means of ball bearings 13.
- the sleeves 11 and 12 are connected by pins 15 and 16 to a screwdriver rod 17, intended for driving the adjusting screw and a hexagonal socket 18, intended for driving the locking nut.
- the sheath 11 is rotated by a stepping motor 19, by means of pulleys 20, 21 and a toothed belt 22.
- the motor 19 thus drives the screwdriver 18, and, consequently, the adjusting screw 23 of a rocker arm 24.
- the sleeve 12 is rotated by a motor 25, which is a screwdriver motor, by means of a sleeve 26, two pulleys 27 and 28 and a toothed belt 29.
- the motor 25 is thus able to apply the torque necessary for tightening and loosening the locking nut 30 mounted on the adjusting screw 23.
- the springs 31-32 respectively push the screwdriver rod 17 and the socket 18 against the adjustment 23 and the locking nut 30.
- the adjusting screw is carried by one end of the rocker arm 24, the other end of which comes into contact with a cam 33 of a camshaft 34 (FIG. 1). It is clear that the invention is not limited to such a provision.
- FIG. 3 shows the device intended to capture the movements of the valve.
- a button 40 is in contact with the upper cup 41 of the valve 42 which we want to adjust the rocker game.
- the key 40 is carried by a feeler 43 forming a lever, and articulated on an axis 44 carried by a support 45, itself provided with means 46 for fixing relative to the engine block.
- the end of the lever probe 43 carries another key 47, which is in contact with a flat key 48, located at the end of an incremental displacement sensor 49.
- This sensor is itself fixed on another lever 50 , pivotally mounted on an axis 51 carried by the same support 45.
- the end of the lever 50 opposite the sensor 49 carries a spherical key 52 which bears directly on a machined face of the cylinder head of the engine, as close as possible to the valve 42.
- a jack 53 pushes the lever 50 and thus ensures contact between the key 52 and the cylinder head.
- a spring 54 is supported on the support 45, and pushes the feeler-lever 43 to ensure the contact of the key 40 on the cup 41 of the valve.
- the feeler lever 50 is actually formed of parallel plates, held by spacers 55, 56.
- the spacer 56 passes under the feeler lever 43, so that when the cylinder 53 lifts the opposite end of the lever 50 upwards, according to FIG. 3, the lever 43 is also lifted and put out of contact with the valve cup, against the force of the spring 54, which allows the setting in place of the assembly without risking damaging the keys 40, 52.
- a motor fixed on a plate, is immobilized in a fixed position at the adjustment station.
- Slides fixed in the adjustment station, carry a frame 10 and a support 45. These are successively immobilized in line with all the valves arranged along the same line of the engine, for example the intake valves, for adjustment of the clearance that is specific to these valves.
- One or more other sets of slides, each carrying similar equipment, may be assigned to valves arranged along one or more other lines of the engine, for example the exhaust valves.
- the central control member 1 comprises a processor 61, whose functions have been explained above, and two memories 62, 63, which contain the numbers of steps of the motor 19, in steps e) and g) of the process.
- memories 62 and 63 can be parts of a single memory.
- FIGS. 5 to 8 relate to a preferred variant
- the elements different from those of FIGS. 1 to 4 bear reference numbers equal to or greater than 100.
- Figure 5 corresponds to the bottom left part of Figures 1 and 3 on a considerably enlarged scale, for clarity.
- a rocker arm 24, crossed by an adjustment screw 23 A screwdriver rod 17 is arranged to rotate the adjustment screw, and a hexagon socket 18 is intended to drive the nut blocking 30 of this adjusting screw.
- the figure also shows the stem of a valve 42 which, in the arrangement of the main patent, comes to bear directly on the end of the adjusting screw 23.
- a shim 100 is interposed between the adjustment rod 23 and the valve 42.
- This shim is mounted, fixed in rotation, on a support rod 101 mounted in a bearing 102, carried by a plate 103, itself connected to the frame by two balusters 104.
- a control lever 105 is mounted, fixed in rotation, on the shaft 101.
- the lever 105 has the form of a horizontal arm and it is articulated on the rod of an actuator 106, the body of which is itself articulated on a support carried by the plate 103.
- the position of the actuator 106 is shown in solid lines, or in dashed lines, lever 105 and shim 100 which correspond to the actuation of this shim, that is to say in the position visible in FIG. 1.
- the positions 105A and 100A of the lever and of the shim in their inactive position, which allows the establishment of the valve.
- the cylinder 106 can be pneumatic or hydraulic, or electric.
- an electronic oscillator (not shown) to be interposed between the support rod 101 and the shim 100.
- This oscillator causes an oscillating movement of small angular amplitude around the axis of the support rod 101 in the proper plane of the hold.
- the electronics associated with the electromagnet which has a feedback winding, oscillates the system at its natural frequency (a few hundred Hertz). As soon as the wedge is hampered in its oscillating movement by the fact that it is tightened, the oscillations cease, which is instantly detected by the electronics and makes it possible to know precisely when the tightening starts or stops.
- FIG. 7 shows another method of detecting the tightening of the shim 100.
- This consists of a sandwich of three layers: a layer 110 of treated steel, a layer 111 of alumina, and a layer 112 of carbide of tungsten and nickel.
- the two end faces of the sandwich are electrically conductive, but the alumina layer constitutes an insulator.
- a very simple electrical circuit consisting of a voltage source 113, connected to the two layers conductive 110 and 112, and, in parallel, to a millivoltmeter 114. It is obvious that the indication of the millivoltmeter 114 corresponds to the voltage across the terminals of the source 113 as long as 110 and 111 are not in contact respectively with the valve 42 and with the adjusting screw 43. On the contrary, as soon as this contact takes place, the entire apparatus being metallic, the voltage across the terminals of the millivoltmeter 114 drops to zero.
- FIG. 4 shows a different embodiment of the shim 100.
- the two layers of aluminum 121, 122 are connected to a charge amplifier 125.
- polyvinylidene fluoride is piezoelectric. It is therefore understood that, as soon as the shim is compressed, a voltage appears at the terminals of the charge amplifier 125. It is within the reach of the skilled person to convert the voltages supplied at the terminals of the millivoltmeter 114 or at output of the charge amplifier 125 into control signals for implementing the method which has been described above.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8909102 | 1989-07-06 | ||
| FR8909102A FR2649444B1 (fr) | 1989-07-06 | 1989-07-06 | Procede de reglage du jeu des culbuteurs d'un moteur a combustion interne, et appareillage pour la mise en oeuvre de ce procede |
| FR9000327A FR2657118B1 (fr) | 1989-07-06 | 1990-01-12 | Procede de reglage du jeu des culbuteurs d'un moteur a combustion interne, et appareillage pour la mise en óoeuvre de ce procede. |
| FR9000327 | 1990-01-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0407302A1 true EP0407302A1 (de) | 1991-01-09 |
| EP0407302B1 EP0407302B1 (de) | 1993-04-21 |
Family
ID=26227455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19900401948 Expired - Lifetime EP0407302B1 (de) | 1989-07-06 | 1990-07-05 | Verfahren zum Einstellen des Ventilspiels bei Brennkraftmaschinen und Einrichtung zur Durchführung dieses Verfahrens |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0407302B1 (de) |
| DE (1) | DE69001401T2 (de) |
| ES (1) | ES2041513T3 (de) |
| FR (1) | FR2657118B1 (de) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0540068A1 (de) * | 1991-09-20 | 1993-05-05 | ATTREZZATURA TORNERIA STAMPI A.T.S. S.d.f. di Spaggiara & Pignatti | Einrichtung für die automatische Einstellung der Anschläge einer Gasregelung bei Haushaltbrennern |
| EP1193374A2 (de) * | 2000-08-30 | 2002-04-03 | Perkins Engines Company Limited | Verfahren und Vorrichtung zur automatischen Einstellung von Spielen in einer Brennkraftmaschine |
| US6471299B2 (en) | 2001-02-15 | 2002-10-29 | Caterpillar Inc | Mooring device for maintaining a dump body in a raised position |
| WO2003036076A1 (de) * | 2001-10-15 | 2003-05-01 | Siemens Aktiengesellschaft | Verfahren und vorrichtung zum automatischen einstellen von injektoren |
| CN108180048A (zh) * | 2017-12-15 | 2018-06-19 | 潍柴动力股份有限公司 | 一种气门间隙调整装置 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3002015A1 (de) * | 1979-01-24 | 1980-07-31 | Toyota Motor Co Ltd | Verfahren und einrichtung zum einstellen des ventilspiels und zum pruefen der ventilsteuerung bei brennkraftmaschinen |
| DE3122004A1 (de) * | 1980-06-05 | 1982-04-01 | Toyota Jidosha Kogyo K.K., Toyota, Aichi | Verfahren und einrichtung zum erfassen von unregelmaessigkeiten im ventilstellsystem von inneren brennkraftmaschinen |
| DE3635929A1 (de) * | 1986-10-22 | 1988-05-05 | Daimler Benz Ag | Verfahren zum einstellen des ventilspiels eines ventils in einer brennkraftmaschine |
-
1990
- 1990-01-12 FR FR9000327A patent/FR2657118B1/fr not_active Expired - Lifetime
- 1990-07-05 EP EP19900401948 patent/EP0407302B1/de not_active Expired - Lifetime
- 1990-07-05 ES ES90401948T patent/ES2041513T3/es not_active Expired - Lifetime
- 1990-07-05 DE DE1990601401 patent/DE69001401T2/de not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3002015A1 (de) * | 1979-01-24 | 1980-07-31 | Toyota Motor Co Ltd | Verfahren und einrichtung zum einstellen des ventilspiels und zum pruefen der ventilsteuerung bei brennkraftmaschinen |
| DE3122004A1 (de) * | 1980-06-05 | 1982-04-01 | Toyota Jidosha Kogyo K.K., Toyota, Aichi | Verfahren und einrichtung zum erfassen von unregelmaessigkeiten im ventilstellsystem von inneren brennkraftmaschinen |
| DE3635929A1 (de) * | 1986-10-22 | 1988-05-05 | Daimler Benz Ag | Verfahren zum einstellen des ventilspiels eines ventils in einer brennkraftmaschine |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0540068A1 (de) * | 1991-09-20 | 1993-05-05 | ATTREZZATURA TORNERIA STAMPI A.T.S. S.d.f. di Spaggiara & Pignatti | Einrichtung für die automatische Einstellung der Anschläge einer Gasregelung bei Haushaltbrennern |
| EP1193374A2 (de) * | 2000-08-30 | 2002-04-03 | Perkins Engines Company Limited | Verfahren und Vorrichtung zur automatischen Einstellung von Spielen in einer Brennkraftmaschine |
| EP1193374A3 (de) * | 2000-08-30 | 2002-10-16 | Perkins Engines Company Limited | Verfahren und Vorrichtung zur automatischen Einstellung von Spielen in einer Brennkraftmaschine |
| US6471299B2 (en) | 2001-02-15 | 2002-10-29 | Caterpillar Inc | Mooring device for maintaining a dump body in a raised position |
| WO2003036076A1 (de) * | 2001-10-15 | 2003-05-01 | Siemens Aktiengesellschaft | Verfahren und vorrichtung zum automatischen einstellen von injektoren |
| CN108180048A (zh) * | 2017-12-15 | 2018-06-19 | 潍柴动力股份有限公司 | 一种气门间隙调整装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2041513T3 (es) | 1993-11-16 |
| DE69001401D1 (de) | 1993-05-27 |
| FR2657118B1 (fr) | 1992-05-29 |
| FR2657118A1 (fr) | 1991-07-19 |
| DE69001401T2 (de) | 1993-07-29 |
| EP0407302B1 (de) | 1993-04-21 |
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