EP0295453B1 - Méthode et outil d'usinage des surfaces de machines à combustion interne - Google Patents

Méthode et outil d'usinage des surfaces de machines à combustion interne Download PDF

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Publication number
EP0295453B1
EP0295453B1 EP88108072A EP88108072A EP0295453B1 EP 0295453 B1 EP0295453 B1 EP 0295453B1 EP 88108072 A EP88108072 A EP 88108072A EP 88108072 A EP88108072 A EP 88108072A EP 0295453 B1 EP0295453 B1 EP 0295453B1
Authority
EP
European Patent Office
Prior art keywords
tool
honing
brush
tool according
machining
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.)
Expired - Lifetime
Application number
EP88108072A
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German (de)
English (en)
Other versions
EP0295453A3 (en
EP0295453A2 (fr
Inventor
Ulrich Klink
Gerhard Sandhof
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Gehring GmbH and Co KG
Original Assignee
Maschinenfabrik Gehring GmbH and Co KG
Priority date (The priority date 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 date listed.)
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Publication date
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Publication of EP0295453A2 publication Critical patent/EP0295453A2/fr
Publication of EP0295453A3 publication Critical patent/EP0295453A3/de
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Publication of EP0295453B1 publication Critical patent/EP0295453B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
    • B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
    • B24B29/06—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces for elongated workpieces having uniform cross-section in one main direction
    • B24B29/08—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces for elongated workpieces having uniform cross-section in one main direction the cross-section being circular, e.g. tubes, wires, needles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/08—Honing tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/4927—Cylinder, cylinder head or engine valve sleeve making

Definitions

  • the invention relates to a method and a tool for fine machining the surfaces of bores in workpieces, in particular piston running surfaces on internal combustion engines, according to the preamble of claims 1 and 8.
  • Honing is machining with a multi-edged tool made of bonded grain with constant surface contact between the tool and the workpiece.
  • the cutting movement is formed from a rotary movement and a reciprocating lifting movement.
  • the honed surface shows fine, intersecting traces.
  • the material structure is deformed in the area of the edge zone.
  • a surface structure can be seen in which the cut edges of the honing grooves are torn out and overlapped.
  • the cross-sections of the honing grooves are partially smaller due to overlaps directly on the surface than below.
  • sheet metal jacket This surface deformation of the honed tread, referred to in technical parlance as "sheet metal jacket”, works adversely affects the running-in behavior of the friction partners of the piston ring and cylinder surface, increases the tendency to burn marks and seizure and leads to increased initial oil consumption.
  • the additional brushing after honing can remove material overlaps and loosely adhering material particles.
  • the processing result is not satisfactory in every case.
  • Residues from electrochemical processing and loosened structure should be removed, but on the other hand the graphite nests embedded in the structure should not be destroyed or removed.
  • the invention is based on the object of designing a method of the type mentioned at the outset and creating a tool for carrying it out with which a surface free of a sheet metal jacket can be ensured, the graphite nests embedded in the structure not being destroyed or detached.
  • the object is achieved according to the invention in a method of the generic type with the characterizing features of claim 1 and in a tool for carrying out the method with the characterizing features of claim 8.
  • the combined high-pressure jet and brush treatment which is carried out in addition to the honing process, means that the surface to be processed is brushed and blasted in one operation, with the honed and brushed surface being subjected to high pressure
  • the liquid jet striking the surface detaches and removes the bent material parts that form the sheet metal jacket. Since no additional work step with reclamping the workpiece is required, the process is also very economical.
  • the tool according to the invention is simple in construction and also allows combined processing by simultaneous brushing and high-pressure blasting.
  • FIG. 1 schematically shows a device with which a cylinder bore 1 of an engine cylinder block 2 is machined.
  • the cylinder bore 1 has been honed in a manner known per se after drilling in a honing machine and is now being reworked by a combined blasting and brushing tool 3.
  • the tool 3 is driven in rotation and executes a reciprocating lifting movement in the direction of the bore axis, the same kinematic conditions as in the previous honing preferably being applicable.
  • the tool 3 is connected via a connecting rod 4 to a machine spindle 5 which is rotatably driven by a known (not shown) rotary drive.
  • the machine spindle 5 is also moved in a known manner by a (not shown) lifting drive, for example a piston-cylinder arrangement, alternately up and down, such that the tool 3 is guided several times over the entire area of the running surface 6 of the cylinder bore 1 becomes.
  • the tool body 12 carries brushes 7, which on the Contact tread 6 of cylinder bore 1.
  • a jet device 13 is provided on the tool body 12 with outlets designed as nozzle openings 8, via which a high-pressure liquid jet is directed against the running surface 6 of the cylinder bore 1.
  • the nozzle openings 8 are connected to a high-pressure source 9, which is fed with liquid, preferably honing oil, from a corresponding reservoir 11.
  • a high-pressure source 9 which is fed with liquid, preferably honing oil, from a corresponding reservoir 11.
  • the connection between the high-pressure source 9 and the nozzle openings 8 takes place via a distributor system 10 which is arranged on the machine spindle 5 and which supplies the high-pressure liquid to the tool 3 via the connecting rod 4, which for example is hollow.
  • the tread 6 of the cylinder bore 1 is blasted and brushed in one operation with the device according to FIG. 1, the blasting and brushing process being able to be carried out simultaneously and / or in succession, as will be explained in more detail below using a number of differently designed tools.
  • the tool 3a essentially consists of a hollow cylindrical tool body 14 which carries several, for example four evenly arranged, deliverable tool parts designed as brush strips 15 on its outer circumference.
  • the brush strips 15 are guided in grooves 16 of the tool body 14 and interact via pressure pieces 17 with an infeed device 19 arranged in the interior 18 of the tool body. It has two cones 20, 21 which have the same inclination as the pressure pieces 17 and cooperate with them in such a way that when the feed device 19 moves axially via a pressure rod 27 the brush strips 15 are moved radially outwards.
  • a liquid channel of the jet device 13 which runs axially in the tool body 14 and is designed as a longitudinal bore 22, is provided and is closed at its lower end with a stopper 23.
  • the longitudinal bores 22 each open into a transverse channel 24, which opens into an annular channel 25 provided in the interior of the tool body 14.
  • the transverse channels 24 are each closed to the outside by a plug 26.
  • the annular channel 25 surrounding the push rod 27 of the delivery device 19 continues in the connecting rod 4 (FIG. 1) and connects the longitudinal bores 22 to the high-pressure source 9 via the distributor system 10.
  • the nozzle bores 28 ' are oriented obliquely forward with respect to the direction of rotation 29 of the tool in the direction of the brush strip 15 leading in each case.
  • the axial plane E which contains the longitudinal central axes A and A 'of the tool body 14 or the respective longitudinal bore 22, forms an angle 30 of approximately 30 ° to 60 ° with the longitudinal axis L of the associated nozzle bore 28.
  • the direction of rotation 29 for the combined blasting and brushing tool 3a is preferably selected so that it runs in the opposite direction to the previous honing process. It is thereby achieved that the one emerging from the nozzle bores 28 with high pressure Liquid jet is directed at an acute angle against the overlaps of the cutting edges of the honing grooves that occur during honing. As a result, the overlaps are erected and removed by the subsequent brush strip. A particularly good surface structure of the tread is achieved when working with a jet pressure of approx. 100 to 700 bar.
  • FIG. 4 shows a further tool 3b for the combined blasting and brushing treatment of a previously honed running surface.
  • the tool 3b carries at least three, preferably four or six radially adjustable brush strips 31.
  • the jet device 13 ′ has longitudinal bores 32 for supplying the high-pressure liquid and nozzle openings 35 which are located within the brush strips 31.
  • the longitudinal bores 32 are each formed by an axially extending blind hole.
  • a nipple 33 is attached, which is connected to a pressure hose 34.
  • the pressure hose 34 is connected to a corresponding distributor system 10 (FIG. 1), as a result of which the blind hole 32 is connected to the high-pressure source 9.
  • a plurality of nozzle bores 35 which are preferably arranged at the same axial distance above one another, run radially outward from each longitudinal bore 32 and each open out between a bristle lining of the brush strips 31.
  • 5a to 5c show various exemplary embodiments of brush strips with an integrated jet device, each in cross section at the level of one of the outlet points for the high-pressure liquid.
  • 5a starting from the central longitudinal bore 32 in the Brush strip 31 has a radially extending nozzle bore 35 which opens between two rows of bristles 36 and 37. 4, a plurality of nozzle bores 35 are arranged in succession in the longitudinal direction of the brush strips 31 at the same distance from one another.
  • a particularly good and intensive blasting effect is achieved with the blasting device 13b (FIG. 5b), which has additional nozzle bores 38 and 39 in the same plane of the brush bar 31 '.
  • the nozzle bores run obliquely outwards from the longitudinal bore 32 to the sides of the double row of bristles 36, 37 facing away from one another.
  • the blasting agent can also be fed directly through fastening bores 40, 41 of the individual bristle tufts 42.
  • the bores 40 extend from a recess 43 with a rectangular cross section on the inside of the strip body 44 to the bristle tufts 42.
  • the recess 43 is closed on its side facing away from the bristle tufts by a cover strip 45 and forms a longitudinal channel 32 'of the jet device 13c for the feeding of the abrasive.
  • FIG. 6 and 7 show a particularly advantageous embodiment of a tool 3c, which is provided for the combined honing, blasting and brushing machining of the tread of a cylinder bore.
  • the tool is equipped with four honing stones 50, which are known per se Can be delivered in the radial direction by a first delivery system 51.
  • a brush bar 52 is provided between each two honing bars 50 and can be delivered independently of the honing bars 50 via a second feed system 53, which is also known.
  • Four honing and brushing strips are preferably provided in each case.
  • the jet device 54 for the high-pressure liquid jet can, as shown in FIG. 6, be integrated in the brush strips 52. They are designed in the same way as the brush strips 31 according to FIG. 4.
  • the jet device 54 ' can also be installed in the tool body in accordance with the described tool design according to FIG. 2, with 52 nozzle openings 55 being provided between a honing bar 50 and a brush bar (FIG. 7).
  • a honing bar 50 and a brush bar (FIG. 7).
  • blasting can preferably be carried out simultaneously during honing, whereby the cutting behavior of the honing stones is improved by optimal lubrication, heat and chip removal so that lower honing pressures are possible, which counteracts the formation of the overlaps referred to as a sheet metal jacket.
  • Lower honing pressures also mean less workpiece deformation, which also improves the machining accuracy itself.
  • Another honing and additional brush processing immediately follows the honing process.
  • the direction of rotation of the tool is preferably changed, as a result of which the overlaps and squeezes which are produced during the honing process and are referred to as the sheet metal jacket can be better erected and removed. Particularly good results are obtained when working with increased jet pressure during the brushing process.
  • FIGS. 8 and 9 show a further exemplary embodiment of a tool 3d, which is provided for the combined honing and high-pressure jet machining of the surface of a workpiece, in particular the running surface of a cylinder bore.
  • the tool has six honing stones 56, which, as is known, are preferably arranged uniformly distributed on the circumference of the tool body 57 and can be fed radially via a feed system 58.
  • a jet device 60 is provided in the tool body 57, which essentially consists of two longitudinal bores 62 and a pair of outwardly directed nozzle bores 61, one of the two longitudinal bores each being arranged between two adjacent honing stones 56.
  • the longitudinal bores 62 are each connected to a transverse channel 63 and an axially extending ring channel 64.
  • the nozzle bores 61 are supplied with high-pressure liquid from the high-pressure source 9 (FIG. 1) via the distributor system 10.
  • the nozzle bores 61 (FIG. 9) are preferably oriented obliquely outwards and in each case in the direction of the honing stone 56 following in the direction of rotation 65.
  • the angle 66 between the axis of the nozzle bore and the axial plane containing the axis of the longitudinal bore 62 is approximately 30 ° to 60 °.
  • the two nozzle bores 61 and the two axially extending longitudinal bores 62 are diametrically opposite one another.
  • the blasting can be carried out after honing, for example during at least one stroke carried out at a low stroke speed. Preferably, however, the blasting is carried out during the extension stroke of the tool from the workpiece bore after honing has been completed, whereupon the surface is brushed.
  • the beam processing is preferably carried out, at least temporarily, during the honing process.
  • a plurality of nozzle bores 61 are arranged one above the other at equal intervals.
  • the jet device 70 is integrated in the honing stones 71.
  • Each honing stone 71 consists of a base strip 72 on which a honing stone 73 is fastened, for example by gluing or soldering.
  • the longitudinal bore 74 which is designed as a blind hole and is connected to a pressure hose 76 via a nipple 75.
  • the pressure hose 76 is connected to a corresponding distributor system 10 (FIG. 1), as a result of which the longitudinal bore 74 is connected to the high-pressure source 9.
  • Each longitudinal bore 74 is followed by a plurality of nozzle bores 77 or slots arranged one above the other at equal intervals. They run approximately radially outwards and guide the abrasive through the honing stones and / or directly next to the honing stones onto the surface of the workpiece.
  • FIGS. 11a to 11c Various exemplary embodiments of the honing stone 71 with an integrated jet device 70a to 70c are shown schematically in cross section in FIGS. 11a to 11c.
  • the honing stone 73 is received in a groove 85 of a correspondingly wider base strip 72 and held there with an adhesive or solder layer 78.
  • narrow webs 79 of the base bar 72 are formed on both sides of the honing stone 73.
  • nozzle bores 77 run obliquely outwards and each open out in one of the two webs 79.
  • the blasting agent will emerge directly on both sides of the honing stone 73, whereby a good cooling and lubricating effect for the honing stone is achieved in addition to the intended blasting effect.
  • the honing stone 73 ' has on its rear side facing the base bar 72' a groove-shaped recess 80, which is connected to the longitudinal bore 74 via a plurality of radially extending bores 81 or slots of the beam device 70b arranged one above the other at an axial distance.
  • the base bar 72 ' is provided with an elevation 82 which projects into the groove-shaped recess 80 of the honing stone 73'. A possible blockage of the bore 81 when the honing stone is glued to the base strip is avoided by the increase 82.
  • additional nozzle bores 83 can be provided in the honing stone 73 ', which run outwards from the recess 80 and open into the working surface 84 of the honing stone.
  • blasting nozzles can be provided in the tool body within the honing and brush strips.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (23)

  1. Méthode de finissage des surfaces d'alésages dans des pièces, des surfaces frottantes de piston sur des moteurs à combustion interne, notamment, la surface étant usinée par honage et brossage dans des conditions cinématiques respectivement égales, caractérisée en ce que la surface est soumise à un traitement supplémentaire par projection de jet sous haute pression, le brossage et le balayage au jet étant réalisés en une passe et dans les mêmes conditions cinématiques que le honage.
  2. Méthode suivant la revendication 1, caractérisée en ce que le brossage et la projection de jet sous haute pression sont réalisés simultanément, temporairement du moins.
  3. Méthode suivant l'une des revendications 1 et 2, caractérisée en ce que le sens de rotation du traitement combiné à la brosse et au jet sous haute pression est contraire à celui de l'opération précédente de honage.
  4. Méthode suivant l'une quelconque des revendications 1 à 3, caractérisée en ce que le honage, la projection de jet sous haute pression et le brossage sont réalisés en une passe.
  5. Méthode suivant l'une quelconque des revendications 1 à 4, caractérisée en ce que le honage s'accompagne de la projection, temporairement du moins.
  6. Méthode suivant l'une quelconque des revendications 1 à 5, caractérisée en ce que la projection est réalisée à la fin du honage, pendant la course de sortie de l'outil de l'alésage de la pièce à vitesse réduite.
  7. Méthode suivant l'une quelconque des revendications 1 à 6, caractérisée en ce que la projection de jet sous haute pression est assurée avec une pression de jet de l'ordre de 100 à 700 bars.
  8. Outil de brossage pour la réalisation de la méthode suivant l'une quelconque des revendications 1 à 7, avec un corps d'outil à peu près cylindrique muni de brosses (7) sur son pourtour, caractérisé en ce que l'outil (3, 3a à 3e) comporte en outre un dispositif de projection au moins (13, 13', 13a à 13c, 54, 54', 60, 70) avec des orifices de buses (8; 28; 28'; 35; 38; 39; 40; 55, 61, 77, 81, 83), qui débouchent sur le pourtour du corps d'outil (12; 14).
  9. Outil suivant la revendication 8, caractérisé en ce que les orifices de buses (8; 28; 28'; 35; 38; 39; 40; 55, 61, 77, 81, 83) sont disposés à des distances essentiellement égales, et sont reliés à une source de liquide sous haute pression (9) par l'intermédiaire d'un système répartiteur (10).
  10. Outil suivant l'une des revendications 8 et 9, caractérisé en ce que les brosses (7) sont disposées sur des barres de brossage (15; 31; 31'; 52).
  11. Outil suivant la revendication 10, caractérisé en ce que les barres de brossage (15; 31; 31'; 52) sont disposées sur le corps d'outil (14), avec une possibilité de déplacement dans le sens radial par rapport à l'axe de l'outil (3; 3a à 3e).
  12. Outil suivant l'une quelconque des revendications 8 à 11, caractérisé en ce que le corps d'outil (14) présente un conduit de liquide au moins (22; 32; 32'; 62; 74), prévu dans le sens axial.
  13. Outil suivant la revendication 12, caractérisé en ce que le conduit de liquide (32; 32'; 62; 74) est réalisé sous forme de trou borgne.
  14. Outil suivant l'une quelconque des revendications 8 à 13, caractérisé en ce que les orifices de buses (28; 28', 38; 39; 55; 61; 77) sont réalisés sous forme de trous, qui s'étendent à l'oblique par rapport à l'axe de l'outil, vers l'extérieur, en direction de la brosse (15; 31; 52) respectivement voisine.
  15. Outil suivant les revendications 12 et 14, caractérisé en ce que l'angle de projection (30; 66), entre l'axe (L) du trou de buse et un plan axial (E) de l'outil, comportant l'axe (A') du conduit de liquide (22), est de l'ordre de 30 à 60°.
  16. Outil suivant l'une quelconque des revendications 10 à 15, caractérisé en ce que les orifices de buses (35; 38 à 40) sont prévus à l'intérieur des barres de brossage (31; 31'; 52), et débouchent de préférence dans une garniture de fibres de la barre de brossage respective (31).
  17. Outil suivant la revendication 16, caractérisé en ce que les barres de brossage (31) présentent respectivement un trou de buse radial (35) au moins et deux trous de buses (38 et 39) au moins, situés de part et d'autre de ce trou (35) et dirigés à l'oblique vers l'extérieur, ces trous divergeant en direction de l'extérieur, à partir du conduit de liquide (32), et débouchant de préférence latéralement, à côté des barres de brossage (36, 37).
  18. Outil suivant l'une quelconque des revendications 8 à 17, caractérisé en ce que l'outil (3c), outre les brosses (52) et le dispositif de projection (60; 70), présente des barres d'abrasifs (50; 56; 71) dotées d'une possibilité de déplacement.
  19. Outil suivant les revendications 10 et 18, caractérisé en ce que les barres de brossage (52) et les barres d'abrasifs (50; 56; 71) peuvent être déplacées dans le sens radial, indépendamment les unes des autres, par un système d'avance respectif (51 et 53).
  20. Outil suivant les revendications 8 à 13 et 18 ou 19, caractérisé en ce que le dispositif de projection (70) est associé aux barres d'abrasifs (71).
  21. Outil suivant la revendication 20, caractérisé en ce que les orifices de buses (77; 81) sont respectivement prévus dans une barre de base (72) de la barre d'abrasifs (71) correspondante.
  22. Outil suivant la revendication 21, caractérisé en ce que les orifices de buses (77; 81) débouchent dans la surface de travail des pierres à abraser et/ou à côté de ces dernières.
  23. Outil suivant l'une des revendications 21 et 22, caractérisé en ce qu'un évidement en forme de rainure (80), qui communique avec le conduit longitudinal (74) par un orifice de buse (81) à peu près radial, est prévu entre chaque pierre à abraser (73') et la barre de base correspondante (72).
EP88108072A 1987-06-13 1988-05-20 Méthode et outil d'usinage des surfaces de machines à combustion interne Expired - Lifetime EP0295453B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873719796 DE3719796A1 (de) 1987-06-13 1987-06-13 Verfahren und werkzeug zum bearbeiten von oberflaechen, insbesondere von laufflaechen von verbrennungsmaschinen
DE3719796 1987-06-13

Publications (3)

Publication Number Publication Date
EP0295453A2 EP0295453A2 (fr) 1988-12-21
EP0295453A3 EP0295453A3 (en) 1990-05-16
EP0295453B1 true EP0295453B1 (fr) 1993-03-03

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EP88108072A Expired - Lifetime EP0295453B1 (fr) 1987-06-13 1988-05-20 Méthode et outil d'usinage des surfaces de machines à combustion interne

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Country Link
US (1) US4980996A (fr)
EP (1) EP0295453B1 (fr)
JP (1) JPH0675821B2 (fr)
DE (2) DE3719796A1 (fr)

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US5191864A (en) * 1992-02-03 1993-03-09 Briggs & Stratton Corporation Engine cylinder bore
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EP0295453A3 (en) 1990-05-16
DE3719796C2 (fr) 1993-01-14
JPS6427850A (en) 1989-01-30
DE3878742D1 (de) 1993-04-08
JPH0675821B2 (ja) 1994-09-28
DE3719796A1 (de) 1988-12-22
EP0295453A2 (fr) 1988-12-21
US4980996A (en) 1991-01-01

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