WO1995000293A1 - Outil abrasif de surfaçage de paliers d'arbre a came - Google Patents

Outil abrasif de surfaçage de paliers d'arbre a came Download PDF

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Publication number
WO1995000293A1
WO1995000293A1 PCT/AU1994/000333 AU9400333W WO9500293A1 WO 1995000293 A1 WO1995000293 A1 WO 1995000293A1 AU 9400333 W AU9400333 W AU 9400333W WO 9500293 A1 WO9500293 A1 WO 9500293A1
Authority
WO
WIPO (PCT)
Prior art keywords
camshaft
linishing
tool
alignment
bearing
Prior art date
Application number
PCT/AU1994/000333
Other languages
English (en)
Inventor
James Norman Eastwood
Original Assignee
Eastwood James N
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.)
Filing date
Publication date
Application filed by Eastwood James N filed Critical Eastwood James N
Priority to AU69901/94A priority Critical patent/AU683895B2/en
Priority to GB9503058A priority patent/GB2284167B/en
Publication of WO1995000293A1 publication Critical patent/WO1995000293A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P6/00—Restoring or reconditioning objects
    • B23P6/02—Pistons or cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/04—Rigid drums for carrying flexible material

Definitions

  • This invention relates to a linishing tool for use in the reconditioning of cylinder heads of internal combustion piston engines.
  • a common problem with internal combustion piston engines is that the cylinder head can become warped due to adverse operating conditions leading to localised hot spots in the cylinder head and/or unbalanced forces or pressures acting on the head.
  • a warped cylinder head needs to be reconditioned to bring the clearances substantially back into specification before it can be reused.
  • the integral camshaft bearing surfaces supporting the overhead camshaft may need to be realigned.
  • the current procedure for realigning the bearing surfaces is to use a line borer to ream the "camshaft tunnel" to the required clearance.
  • the line borer is essentially a metal cutting tool which requires the cylinder head to be accurately secured in position relative to the line borer before the procedure can be conducted. Realigning camshaft integral bearing surfaces is therefore at present a time consuming procedure. It is an object of the invention to provide a relatively simple tool for realigning camshaft integral bearing surfaces which will reduce the time required to conduct this procedure.
  • a linishing tool for reconditioning a camshaft integral bearing surface of a cylinder head including an elongate body having an outer surface, at least a portion of the outer surface of the body being a linishing surface, and at least one handle provided at an end of the body, the body having at least one cylindrical section with a lateral cross-section having a diameter corresponding to the required bearing diameter of the camshaft integral bearing surface.
  • the “required bearing diameter” is the radius of curvature of the integral bearing surface which enables the surface to support a camshaft without binding of that camshaft when fitted.
  • the metal finishing process of "linishing” involves the use of a surface covered by fine particles of hard material which acts as an abrasive for the removal of matter by scratching and grinding. This is distinguished from line borers, reamers and files which all use a cutting action to remove material. A substantial portion of the body outer surface may comprise the linishing surface.
  • the linishing surface may for example be in the form of a spiral band circling the cylindrical section(s), and may preferably cover about 50% of the outer surface of the elongate body.
  • the linishing surface may be in the form of a plurality of parallel flutes extending longitudinally along the cylindrical section(s).
  • the linishing surface may comprise substantially the entire outer surface of the elongate body.
  • the elongate body may be provided by a plurality of cylindrical sections arranged in a row with their axes of symmetry co-axial with a common elongate axis of the body.
  • the diameter of the lateral cross-section of each cylindrical section may preferably decrease sequentially from one end of the body to the end thereof
  • the diameter of the lateral cross-section of each cylindrical section corresponds to the required bearing diameter of a particular camshaft integral bearing surface of the cylinder head.
  • a range of linishing tools can therefore be produced for different production cylinder heads, even in the case where the bearing diameters of each integral bearing surface varies on a particular cylinder head.
  • a handle may be provided at opposing ends of the elongate body the handles may be substantially cylindrical and may have a lateral cross-section with a diameter less than the diameter of the cylindrical section with the smallest diameter.
  • Figure 1 is a side elevation view of one example of a linishing tool according to the invention.
  • Figure 2 is a detailed side view of another example of the linishing tool of the present invention.
  • the linishing tool includes an elongate cylindrical body 1 having an outer surface 2. At least a portion of the outer siirface 2 is in the form of a linishing surface 3.
  • the linishing surface 3 is in the form of a spiral circling the body 1 from one end to the opposing end thereof.
  • the linishing surface 3 preferably covers about 50% of the outer surface.
  • the linishing surface 3 could alternatively comprise a plurality of parallel flutes extending longitudinally along the body 1.
  • the advantage of having a linishing surface 3 covering only a portion of the body outer surface 2 is that the smooth surfaces 4 between the linishing surfaces 3 provide a discharge path for material removed by the linishing tool.
  • the linishing surface 3 comprise substantially the entire outer surface 2.
  • the diameter of the elongate body 2 corresponds to the required bearing diameter of the camshaft integral bearing surfaces of the cylindrical head.
  • the body 1 may include a plurality of cylindrical sections 7, 8 as shown in a detail view in Figure 2 with the diameter of the lateral cross-section of each section corresponding to the required bearing diameter of a particular bearing surface.
  • the axis of symmetry of each cylindrical section 7, 8 are co-axial w h a common elongate axis of the body 1.
  • the cylindrical section diameters can decrease in diameter sequentially from one end of the body 2 to the other end thereof providing a series of stepped changes in diameter.
  • a range of linishing tools can therefore be produced to suit the varying camshaft bearing diameters already in production cylinder heads.
  • Handles are provided at opposing ends of the elongate body 1 and are cylindrical in form.
  • the lateral cross-section of each handle 5 has a diameter less than that of the lateral cross section of the cylindrical section with the smallest diameter.
  • the linishing tool is used by placing the elongate body 1 of the tool in the "camshaft tunnel" as defined by the integral bearing surfaces, and by moving the tool in a direction parallel to its elongate axis and/or rotating the tool about the axis so that the linishing surfaces 3 abrades the bearing surface removing all of the "high spots” therein which would cause binding of the camshaft if not removed .
  • the illustrated example shows handles for manual use of the linishing tool, it is also envisaged that the linishing tool be motor driven. As the linishing tool works on all the bearing surfaces simultaneously, the bearing surfaces are aligned more quickly than by the known procedure. Furthermore, because the tool is dimensioned to the required bearing diameter(s), and because the linishing process provides a smooth finish, the bearing surfaces are more accurately finished to the required clearance.
  • the linishing tool can be machined from a single bar of bright steel or from mild steel which is then nickel plated.
  • the handles 5 would therefore be integral with the elongate body 1.
  • the linishing surface is applied to the outer surface of the body 1 by known means, the abrasive material preferably being silicon carbide (commonly known "carborundum”) or diamond dust, although other materials are also envisaged. It is also envisaged that the handles be made separately from the elongate body. Alternatively, if the linishing tool is to be used only a few times, then the tool could be made of wood with an abrasive coating applied using adhesive on the body.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

Outil abrasif de surfaçage destiné au reconditionnement de la surface des paliers d'un arbre à came solidaires dans une culasse. L'outil comprend un corps (1) de forme allongée présentant une surface externe (2) dont au moins une partie constitue la surface abrasive (3) et, au minimum un manche (5) à une extrémité de ce corps, ce dernier comportant au moins une partie cylindrique (8) dont la section transversale latérale présente un diamètre correspondant au diamètre de palier nécessaire défini par la surface des paliers solidaires de l'arbre à came. Le procédé de finition métallurgique constitué par le 'surfaçage' met en ÷uvre une surface couverte de fines particules d'un matériau dur agissant comme abrasif enlevant de la matière par abrasion et meulage. Ce procédé se distingue du limage, du brochage et de l'alésage en ligne par le fait que ces derniers nécessitent tous un effet de coupe pour l'enlèvement de matière.
PCT/AU1994/000333 1993-06-18 1994-06-20 Outil abrasif de surfaçage de paliers d'arbre a came WO1995000293A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU69901/94A AU683895B2 (en) 1993-06-18 1994-06-20 Camshaft bearing surface linishing tool
GB9503058A GB2284167B (en) 1993-06-18 1994-06-20 Camshaft bearing surface linishing tool

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPL949993 1993-06-18
AUPL9499 1993-06-18

Publications (1)

Publication Number Publication Date
WO1995000293A1 true WO1995000293A1 (fr) 1995-01-05

Family

ID=3776988

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1994/000333 WO1995000293A1 (fr) 1993-06-18 1994-06-20 Outil abrasif de surfaçage de paliers d'arbre a came

Country Status (4)

Country Link
AU (1) AU683895B2 (fr)
CA (1) CA2142850A1 (fr)
GB (1) GB2284167B (fr)
WO (1) WO1995000293A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1368744A (en) * 1944-03-31 1946-02-11 Boscawen Herne Leslie Improved cylinder hone
AU4189372A (en) * 1971-05-26 1974-01-03 Tri-Ordinate Corp. Cam control grinding machine
AU5672473A (en) * 1972-07-13 1974-12-12 Tri-Ordinate Corporation Cam controlled grinding machine
DE3332085A1 (de) * 1983-09-06 1985-03-21 Festo KG, 7300 Esslingen Werkzeug zum aufrauhen, abtragen oder zerspanen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1368744A (en) * 1944-03-31 1946-02-11 Boscawen Herne Leslie Improved cylinder hone
AU1502947A (en) * 1947-09-11 1948-09-16 Leslie Boscawen Herne Improved cylinder hone
AU4189372A (en) * 1971-05-26 1974-01-03 Tri-Ordinate Corp. Cam control grinding machine
AU5672473A (en) * 1972-07-13 1974-12-12 Tri-Ordinate Corporation Cam controlled grinding machine
DE3332085A1 (de) * 1983-09-06 1985-03-21 Festo KG, 7300 Esslingen Werkzeug zum aufrauhen, abtragen oder zerspanen

Also Published As

Publication number Publication date
GB2284167B (en) 1997-08-06
AU6990194A (en) 1995-01-17
GB2284167A (en) 1995-05-31
AU683895B2 (en) 1997-11-27
CA2142850A1 (fr) 1995-01-05
GB9503058D0 (en) 1995-04-05

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