GB2187405A - Securing elements on tubular members - Google Patents

Securing elements on tubular members Download PDF

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Publication number
GB2187405A
GB2187405A GB08605468A GB8605468A GB2187405A GB 2187405 A GB2187405 A GB 2187405A GB 08605468 A GB08605468 A GB 08605468A GB 8605468 A GB8605468 A GB 8605468A GB 2187405 A GB2187405 A GB 2187405A
Authority
GB
United Kingdom
Prior art keywords
tubular member
cam
cam profile
tube
atubularfabrication
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.)
Withdrawn
Application number
GB08605468A
Other versions
GB8605468D0 (en
Inventor
Geoffrey Michael Suter
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.)
GKN Technology Ltd
Original Assignee
GKN Technology Ltd
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 GKN Technology Ltd filed Critical GKN Technology Ltd
Priority to GB08605468A priority Critical patent/GB2187405A/en
Publication of GB8605468D0 publication Critical patent/GB8605468D0/en
Publication of GB2187405A publication Critical patent/GB2187405A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/06—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes in openings, e.g. rolling-in
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/84—Making other particular articles other parts for engines, e.g. connecting-rods
    • B21D53/845—Making camshafts
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H53/00—Cams ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
    • F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
    • F16H53/025—Single-track cams for single-revolution cycles; Camshafts with such cams characterised by their construction, e.g. assembling or manufacturing features

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Gears, Cams (AREA)

Abstract

A tubular fabrication e.g. a cam shaft for an internal combustion engine, comprises a plurality of cam profile rings 12 secured on a central hollow tube 10. The rings 12 may be cut from a cold drawn section or from an extrusion of the required final cam profile and are held on the tube 10 within a die assembly whilst the tube is radially deformed by the application of internal fluid pressure to cause deformation 20 of the tube within each ring 12 thereby to secure each ring to the tube against movement relative thereto. <IMAGE>

Description

SPECIFICATION Tubular fabrication and method for its production This invention relates to a tubularfabrication wherein one or more elements are secured to a central tubular member passing through the or each element; such a fabrication conveniently being suitable for use as an automotive component.
Particularly, but not exclusively, the invention relates to a tubularfabrication comprising one or more elements, such as cams, bearings or gears secured to and axially spaced along a central tubular member to provide a camshaft useablefor example in a reciprocating piston machine such as a compressor oran internal combustion engine.
Camshafts have conventionally been produced as either castings orforgings, usually of steel, or machined from solid stock and comprising a solid elongate shaft having a plurality of axially spaced apart integral cam form and other profiles thereon.
There have also been proposals to produce a fabricated camshaft wherein a plurality of separate cams and other elements have been mounted on a central shaft, which may hollow, for example by adhesives or by sintering.
It has also been proposed in French patent specification 2 321 to expand a hollow tube radially outwardly in a shaped die by internally applied pressure thereby to form integral cam profiles on the exterior ofthetube.
It will be appreciated that the proposals described in the two preceding paragraphs have been directed totheproductionofacamshaftwhichcan be of lighterweightthan the conventional cast or forged camshafts.
It is an object of the present invention to provide a tubularfabrication and method for its production, which will offer advantages of weight reduction, cost effectiveness and versatility.
In accordance with the broadest aspect of the invention there is provided a tubularfabrication comprising a central tubular member and one or more elements thereon wherein the tubular member is radially deformed with respect to the or each element to secure it in position against movement relative to the tubular member; said deformation being provided bythe application of internal fluid pressure within the tubular member.
Also in accordance with the invention there is provided a method of producing a tubular fabrication comprising locating one or more elements around a central tubular member and radially deforming said memberwith respect to the or each element by the application of internal fluid pressure within the tubular member to secure the or each element against movement relative to the tubular member.
Such a fabrication provided as an automotive component may comprise a camshaft wherein the said elements comprise one or more cams or bearings or gears. Such elements may be formed as ceramic or sintered elements or may be formed from cut drawn tube or cut from an extrusion.
In one embodiment of the invention such elements comprise one or more cam rings and the fabrication comprises a camshaft having a central tubular member and a plurality of cam profile rings thereon wherein the tubular member is radially deformed with respecttothe rings to securethem in position against movement relative to the tubular member; said deformation being provided bythe application of internal fluid pressure within the tubular member.
The method of producing such a camshaft comprises locating a plurality of cam rings around a centraltubularmemberand radially deforming said memberwith respect to said rings by the application of internal fluid pressure within the tubular member to secure the rings against movement relative to the tubular member.
The cam rings may be shaped to at least partial final cam profile before they are secured on the central tubular member although the cam rings may be initially circular and thereafter deformed to the desired cam profile during the fluid pressure application stage when they are located on the tubular member.
In a preferred embodiment of the invention the cam rings are shaped substantially to their final cam profile before they are located on and secured to the tubular member.
The cam rings may be produced from a drawn tube or an extrusion to either a circular, partial cam profile or final cam profile as the case may be. Alternatively the cam rings may be fabricated from strip material and closed, such as by welding, to the desired profile.
Thetubularmembermaybeformedofalow carbon steel or aluminium or any other suitable plastically deformable material and the cam rings may be formed of a high strength hardenable ductile steel, or of iron, or of any other suitable material.
The internal fluid pressure may comprise a hydraulic medium although other media may be utilised such as for example a petrol-air explosive mixture within the tubular member.
Otherfeatures of the invention will become apparent from the following description given herein solely by way of example with reference to the accompanying drawings wherein Figure 1 is a transverse cross-sectional view of a cam ring located around a hollow circular tube prior to deformation of the tube Figure2 is a side cross-sectional view of the assembly of cam ring and tube of Figure 1 Figure 3 is a transverse cross-sectional view ofthe cam ring secured to the hollow tube after the application of internal fluid pressure thereto and Figure 4 is a side cross-sectional view of the secured cam ring and tube of Figure 3.
Referring to Figures 1 and 2 of the drawings, there isshowna hollowtubularmemberi0ofuniform circular cross-sectional form which is conveniently formed of a low carbon steel and which comprises the central member of the cam shaft. One cam profile ring 12 is shown which is conveniently produced from a cold drawn section of high strength hardenable ductible steel and then cut transversely ofthe section to form a plurality of such cam profile rings.
It will be noted thatthe internal radius of curvature ofthe lower half 14 of the cam ring 12 is substantially identical with the radius of curvature of the outer surface ofthetubular member 10; a space 16 being defined between the opposed outer surface ofthe tubular member and the interior surface of the actual cam lobe 18 of the ring 12.
A plurality of such rings 12 are assembled on the tubular member 10 within a die and internal fluid pressure is then applied to the interior ofthetubular member to deform it radially outwardly to the configuration shown in Figures 3 and 4. This deformation, as shown at 20, ensures that each ring 12 is captured to and secured on the tube 10 against all movement relative thereto. In particular, referring to Figure4, it will be noted that the tube 10 has been deformed radially outwardly around its lower half to provide radially outwardly extending bulges 22 on either side ofthe cam ring 12 thereby locking the ring against axial movement relative to the tube.It is not necessarythatthe tubular member is deformed to fullyfill the interior ofthe cam ring 12 below the cam lobe 18 as will be seen from Figures 3 and 4wherein a space 24 remains between the tube deformation 20 and the interior surface ofthe lobe 18. However, if desired, the tube deformation may be provided to fill the interior of the cam ring.
Various modifications may be made to the invention without departing from the essential concept thereof. For example, when the invention comprises the camshaft and its method of production as described above, the cam rings may be formed from strip material and welded to the desired profile and such desired profile, whether produced from welded strip or from a cold drawn section, may either be the final cam profile as described with respect to the drawings or may be circular or may be a partial final cam profile.
Furthermorn, the cams need not be provided from a drawn section or from welded strip. The cams may be formed by cutting from an extrusion ortheymay be provided as ceramic or sintered cams. The tube may be formed of aluminium or of any other suitable plastically deformable material. Also, the camshaft may have secured thereon bythe method of the invention other elements such as bearings or gears.
When the cam rings are circular, they are provided to a larger internal diameter than the external diameter ofthe tu be whereby, during the application of internal fluid pressure within the tube, both the tube and the cam rings themselves are deformed to the required final shape as determined bythe die profile in which the rings and tube are located.
Similarly, if the cam rings are provided to partial final cam profile, the tube and rings themselves are again deformed during the application of internal fluid pressureto the desired final profile.
It will be appreciated that the invention is not limited to the production of a camshaft. Any tubular fabrication may be provided in accordance with the invention although it is envisaged that the invention is particularly applicable to automotive components wherein the elements on the tubular member may be provided to any desired exterior profile and formed of any suitable material.
It is preferred that the fluid pressure is applied as a hydraulic medium by a suitable piston connected to one end of the tube, the other end of thetube being sealed, and the whole assembly being located within a suitably profiled die assem bly. Alternatively, the internal fluid pressure may be provided by an explosive medium such as a petrol-air mixture.

Claims (13)

1. Atubularfabrication comprising a central tubular member and one or more elements thereon wherein the tubular member is radially deformed with respect to the or each element to secure it in position against movement relative to the tubular member; said deformation being provided bythe application ofinternalfluid pressurewithinthe tubular member.
2. Atubularfabrication as claimed in Claim 1 comprising a camshaft wherein one or more of said elements comprises a cam profile ring.
3. Atubularfabrication as claimed in either one or Claims 1 or 2 wherein one or more of said elements comprises bearings or gears.
4. Atubularfabrication as claimed in any one of the preceding claims wherein the or each said element is formed from a ceramic or sintered material.
5. Atubularfabrication as claimed in Claim 2 wherein the tubular member is formed of a low carbon steel and the cam profile rings are formed of a high strength hardenable ductible steel.
6. A method of producing a tubularfabrication comprising locating one or more elements around a central tubular member and radially deforming said member with respect to the or each element bythe application of internal fluid pressure within the tubular memberto secure the or each element against movement relative to the tubular member.
7. A method according to Claim 6 forth production of a camshaft wherein one or more of said elements comprises a cam ring.
8. A method according to Claim 7 wherein each cam ring is shaped substantially to its final cam profile before it is secured to the tubular member.
9. A method according to Claim 7 wherein each cam ring is shaped partiallyto its final cam profile before it is located around the tubular member, each said cam ring then being shaped to its final cam profile during the application of internal fluid pressuretothetubular member.
10. A method according to Claim 7 wherein each cam ring is initially ofcircularform before it is located around the tubular member, each said cam ring then being shaped to its final cam profile during the application of internal fluid pressure to the tubular member.
11. A method according to any one of Claims 6 to 10 wherein the fluid pressure is applied to the interiorofthetubular membervia a hydraulic medium.
12. A camshaft constructed and arranged substantially as hereinbefore described with reference to Figures 3 and 4 ofthe accompanying drawings.
13. A method of producing a camshaft substantially as hereinbefore described with reference to the accompanying drawings.
GB08605468A 1986-03-05 1986-03-05 Securing elements on tubular members Withdrawn GB2187405A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08605468A GB2187405A (en) 1986-03-05 1986-03-05 Securing elements on tubular members

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08605468A GB2187405A (en) 1986-03-05 1986-03-05 Securing elements on tubular members

Publications (2)

Publication Number Publication Date
GB8605468D0 GB8605468D0 (en) 1986-04-09
GB2187405A true GB2187405A (en) 1987-09-09

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Family Applications (1)

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GB08605468A Withdrawn GB2187405A (en) 1986-03-05 1986-03-05 Securing elements on tubular members

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0365757A2 (en) * 1988-10-25 1990-05-02 Emitec Gesellschaft für Emissionstechnologie mbH Method of producing cams from a casting material
EP0516946A1 (en) * 1991-06-07 1992-12-09 Bayerische Motoren Werke Aktiengesellschaft Assembled camshaft
WO2001002738A1 (en) * 1999-06-29 2001-01-11 Daimlerchrysler Ag Joining connection, method for producing the same, and a steering column for motor vehicles comprising such a joining connection
WO2003012262A1 (en) * 2001-07-28 2003-02-13 Thyssenkrupp Presta Ag Method for producing cams and camshafts
WO2005075143A1 (en) * 2004-02-06 2005-08-18 Karl Merz Camshaft and method for producing a camshaft of this type
WO2005115658A1 (en) * 2004-05-25 2005-12-08 Daimlerchrysler Ag Camshaft and method for the production thereof
WO2007090635A1 (en) * 2006-02-09 2007-08-16 Linamar Antriebstechnik Gmbh & Co. Kg Method for producing non-rotationally-symmetrical rings and cam ring

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1117816A (en) * 1965-07-31 1968-06-26 Gkn Screws Fasteners Ltd Improvements relating to cam shafts
GB1530519A (en) * 1975-10-18 1978-11-01 Kloeckner Humboldt Deutz Ag Camshafts
GB2050207A (en) * 1979-05-31 1981-01-07 Mannesmann Ag Making camshafts
EP0119112A1 (en) * 1983-02-24 1984-09-19 Automobiles Citroen Shaft with sintered cames stuck to it
GB2153850A (en) * 1984-02-07 1985-08-29 Nippon Piston Ring Co Ltd Method of manufacturing a camshaft

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1117816A (en) * 1965-07-31 1968-06-26 Gkn Screws Fasteners Ltd Improvements relating to cam shafts
GB1530519A (en) * 1975-10-18 1978-11-01 Kloeckner Humboldt Deutz Ag Camshafts
GB2050207A (en) * 1979-05-31 1981-01-07 Mannesmann Ag Making camshafts
EP0119112A1 (en) * 1983-02-24 1984-09-19 Automobiles Citroen Shaft with sintered cames stuck to it
GB2153850A (en) * 1984-02-07 1985-08-29 Nippon Piston Ring Co Ltd Method of manufacturing a camshaft

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0365757A2 (en) * 1988-10-25 1990-05-02 Emitec Gesellschaft für Emissionstechnologie mbH Method of producing cams from a casting material
EP0365757A3 (en) * 1988-10-25 1990-10-10 Emitec Emissionstechnologie Method of producing cams from a casting material
EP0516946A1 (en) * 1991-06-07 1992-12-09 Bayerische Motoren Werke Aktiengesellschaft Assembled camshaft
WO2001002738A1 (en) * 1999-06-29 2001-01-11 Daimlerchrysler Ag Joining connection, method for producing the same, and a steering column for motor vehicles comprising such a joining connection
US6874384B1 (en) 1999-06-29 2005-04-05 Daimlerchrysler Ag Joining connection, method for producing the same, and a steering column for motor vehicles comprising such a joining connection
WO2003012262A1 (en) * 2001-07-28 2003-02-13 Thyssenkrupp Presta Ag Method for producing cams and camshafts
WO2005075143A1 (en) * 2004-02-06 2005-08-18 Karl Merz Camshaft and method for producing a camshaft of this type
JP2007524047A (en) * 2004-02-06 2007-08-23 メルツ，カール Camshaft and manufacturing method thereof
JP4731497B2 (en) * 2004-02-06 2011-07-27 メルツ，カール Camshaft and manufacturing method thereof
WO2005115658A1 (en) * 2004-05-25 2005-12-08 Daimlerchrysler Ag Camshaft and method for the production thereof
WO2007090635A1 (en) * 2006-02-09 2007-08-16 Linamar Antriebstechnik Gmbh & Co. Kg Method for producing non-rotationally-symmetrical rings and cam ring

Also Published As

Publication number Publication date
GB8605468D0 (en) 1986-04-09

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)