GB2157201A - The manufacture of camshafts - Google Patents
The manufacture of camshafts Download PDFInfo
- Publication number
- GB2157201A GB2157201A GB08507419A GB8507419A GB2157201A GB 2157201 A GB2157201 A GB 2157201A GB 08507419 A GB08507419 A GB 08507419A GB 8507419 A GB8507419 A GB 8507419A GB 2157201 A GB2157201 A GB 2157201A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cams
- shaft
- holes
- camshaft
- dummy
- 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
Classifications
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
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- 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
-
- 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
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
- B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
- B23P11/025—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits by using heat or cold
-
- 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
- B23P25/00—Auxiliary treatment of workpieces, before or during machining operations, to facilitate the action of the tool or the attainment of a desired final condition of the work, e.g. relief of internal stress
-
- 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
-
- 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
- B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
- B23P2700/02—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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
- F01L2013/0052—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S29/00—Metal working
- Y10S29/031—Pressing powder with other step
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S29/00—Metal working
- Y10S29/035—Shrink fitting with other step
-
- 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
- Y10T29/49826—Assembling or joining
- Y10T29/49863—Assembling or joining with prestressing of part
- Y10T29/49865—Assembling or joining with prestressing of part by temperature differential [e.g., shrink fit]
-
- 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
- Y10T29/49826—Assembling or joining
- Y10T29/49895—Associating parts by use of aligning means [e.g., use of a drift pin or a "fixture"]
- Y10T29/49901—Sequentially associating parts on stationary aligning means
-
- 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
- Y10T29/49998—Work holding
-
- 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
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/2101—Cams
-
- 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
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/2101—Cams
- Y10T74/2107—Follower
Description
1 GB 2 157 201 A 1
SPECIFICATION
The manufacture of camshafts The invention relates to the manufacture of cam- 70 shafts for internal combustion engines.
A camshaft for an internal conbustion engine has a shaft carrying number of cams which have a re quired angular and axial inter-relationship. The cams have surfaces with a predetermined profile and have to be particularly wear- resistant, since they are repeatedly striking associated. tappets. The traditional way of manufacturing camshafts is by casting or forging, but this can be time-consuming and expensive.
A recent proposal has been to form the cams separately from the shafts and then connect them together. This allows the cams to be made from a first material and by a first technique and the shafts to be made from a different material andlor by a different technique. One example of this is where the cams are made of a sintered metal pow der with a highly wear-resistant surface and where the shaft (which may be solid or may be a tube) is made from a less expensive material, such as a mild steel, machined or forged or extruded to shape.
Such camshafts have the problem, however, that the cams must be very accurately positioned on the shaft before they are connected to them and that their shaft-engaging holes must be truly con centric - because any out of concentricity will be reflected in an inaccurate positioning of the associ ated cam. Hitherto, it has been proposed to con- nect individually finished cams.to a shaft by 100 welding or by the use of pins passing through the cams into the shaft. These manufacturing methods can, however, be time-consuming or expensive and do not deal with the problem of concentricity.
According to a first aspect of the invention, there is provided a method of manufacturing a camshaft, comprising forming a plurality of cams separately from a shaft on which the cams are to be fixed, with each cam having a profiled shaft-engaging hole whose size is smaller than the required final size thereof, positioning the cams on a correspondingly profiled dummy shaft so that the cams have a required relative angular orientation and axial spacing, the profiles of the dummy shaft and the cams preventing angular movement therebetween, holding the positioned cams in a jig to maintain said required relative orientation and spacing, removing the dummy shaft, heating the cams and machining the holes to be concentric and of a pre- cise final size and profile, inserting a correspondingly sized and profiled shaft through the machined holes and then cooling the cams to shrink the cams onto the shaft to fix the cams to the shaft in said required relative orientation and 60 spacing.
The pre-positioning of the cams allows the holes to be machined to true concentricity with the cams in their final relative positions. When the shaft proper is inserted through these holes and the cams shrunk on to them, the cams are thus accu- rately positioned in all respects.
According to a second aspect of the invention, there is provided a camshaft when made by the method of the first aspect of the invention.
The following is a more detailed description of one embodiment of the invention, by way of example, reference being made to the accompanying drawings in which:-
Figure 1 is a section through an assembly of three bearing pieces and six cams mounted on a dummy shaft, Figure 2 is a section through the bearing pieces and cams of Figure 1 held in a jig with the dummy shaft removed, 80 Figure 3 is a similar view to Figure 2 but with the cams and bearing pieces being heated and broached, and Figure 4 shows the cams and bearing pieces of Figures 1 to 3 mounted on a shaft and air-cooled to shrink the cams and bearing pieces onto the shaft.
Referring first to Figure 1, cams 10 and bearing pieces 11 are prepared separately. The cams 10 are formed from a suitable metal or metal alloy pow- der which is sintered by being heated and pressed in a die to produce a cam of a required external profile. Each cam is formed with a hole 12 having inwardly projecting serrations 13 (see Figure 2) which extend in an axial direction and are angu- larly spaced around the associated hole 12. The serrations 13 may, for example, be to SAE specification J500. The size of the holes 12 and the serrations 13 is smaller than their required final depth. Because they are produced by sintering, the dimensions and shape of the holes cannot be very accurately controlled 1 although accuracy is required. Die wear will also contribute to variations in the hole dimensions and shape.
The bearing pieces 11 are prepared in any con- venient way, for example, from steel powder by sintering or from wrought bar and are formed with similarly dimensioned holes 12 and serrations 13.
A dummy shaft 14 (Figure 1) is then prepared which is provided with a serrated cross-sectional shape which is slightly smaller than the cross-sectional shape of the serrated holes 12 in the cams 10 and the bearing pieces 11. The dummy shaft 14 may be formed from a hard metallic or ceramic material by any suitable techinque such as machin- ing or extrusion or die-shaping. The dummy shaft 14 may be solid or a tube. The required number of cams 10 and bearing pieces 11, four cams and three bearing pieces in the embodiment shown, are then arranged on the dummy shaft 14 with the required axial spacing and, in the case of the cams, with the required relative angular orientation. The engagement between the serrations 13 on the cams 10 and the serrations 15 on the dummy shaft 14 prevents relative rotation therebetween. In this way, the cams 10 and the bearing pieces 11 are held in the same relative positions as is required in the finished camshaft.
It will be appreciated that although the cams and the dummy shaft described above have inter-en gaging serrations 13, 15, the necessary inter-en- 2 GB 2 157 201 A 2 gagement between these parts, to allow relative axial movement but prevent any possibility of relative angular movement, may be provided by any suitable non-circular cross-section of the holes 12 and the dummy shaft 14. Serrations, however, have the benefit that, when at a suitably fine pitch, the relative angular positions of all the cams can be fixed very accurately and variations in these positions can be accommodated without alteration of the dummy shaft 14. In addition, the use of serrations permits optimum settlement of the metal powders in the dies during the sintering of the cams 10. This results in correct formation of the serrations and low stress concentrations.
The cams 10 and bearing pieces 11, in the final relative positions on the dummy shaft 14, are then clamped in a jig 16 (Figure 3). The dummy shaft 14 is then removed to leave the cams 10 and the bearing pieces 11 held in the jig 16.
The cams 10 and bearing pieces 11 are next heated to red heat (about 800'C) by an electrical high frequency heating system 17 (see Figure 3), (although any other suitable heating system may be used). This expands the cam 10 and the bearing pieces 11 and also facilitates the machining step now to be described.
The holes 12 in the cams 10 and bearing pieces 11 are then machined by means of a broaching tool 18 which is drawn axially through the holes 12. The broach 18 increases the depth of the serra- 95 tions and also increases the diameter of the holes 12 to produce a required final profile and to ensure that all the holes 12 are truly axially aligned. This also ensures that the serrated holes 12 so formed are of accurate size for fitting onto a shaft in a 100 manner to be described below, so removing varia tions caused by sintering and die wear.
Once machining of the red hot cams 10 and bearing pieces 11 has been completed, a shaft 19 (which may be solid or a tube) is inserted through 105 the cams and bearing pieces. The shaft 19 is, for example, of mild steel and is formed by hobbing, extruding or die-forming with a serrated exterior profile which is fractionally larger than the profile of the cams 10 and bearing pieces 11, when at am bient temperatures. The cams 10 and bearing pieces 11 are then cooled, for example by air jets (which may contain water droplets to speed cooling) so that they shrink on to the shaft 19 with an interference fit and so are firmly attached thereto. The cams 10 and bearing pieces 11 are then released from the jig 16. Because of their pre vious correct positioning on the dummy shaft and because of the accurate and concentric machining of the serrated holes, the cams 10 and bearing pieces 11 are thus very precisely fixed on the shaft 19 in their required axial and angular positions without excessive interference. The camshaft so produced can be ready for use without further processing.
Claims (9)
1. A method of manufacturing a camshaft, comprising forming a plurality of cams separately from a shaft on which the cams are to be fixed, with each cam having a profiled shaft-engaging hole whose size is smaller than the required final size thereof, positioning the cams on a correspond- ingly profiled dummy shaft so that the cams have a required relative angular orientation and axial spacing, the profiles of the dummy shaft and the cams preventing relative angular movement therebetween, holding the positioned cams in a jig to maintain said required relative orientation and spacing, removing the dummy shaft, heating the cams and machining the holes to be concentric and of a precise final size and profile, inserting a correspondingly sized and profiled shaft through the machined holes and then cooling the cams to shrink the cams onto the shaft to fix the cams to the shaft in said required relative orientation and spacing.
2. A method according to claim 1, wherein the profile of the cam holes, the dummy shaft and the shaft is a serrated profile, with the serrations extending axially.
3, A method according to claim 1 or claim 2, wherein the cams are formed from a sintered metal powder.
4. A method according to any one of claims 1 to 3, wherein the heating of the cams is by an electrical high frequency heating process.
5. A method according to any one of claims 1 to 4, wherein the machining step is a broaching step carried out while the cams are heated.
6. A method according to any one of claims 1 to 5, wherein the cooling step is an air blast quench and includes a water droplet content.
7. A method according p any one of claims 1 to 6 and further including connecting bearing pieces to the shaft by a method which is the same as the method of connection of the cams.
8. A method of manufacturing a camshaft, substantially as hereinbefore described with reference to the accompanying drawings.
9. A camshaft when made by the method of any one of claims 1 to 8.
Printed in the UK for HMSO, D8818935, 8185, 7102. Published by The Patent Office, 25 Southampton Buildings, London, WC2A lAY, from which copies may be obtained.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB848409771A GB8409771D0 (en) | 1984-04-14 | 1984-04-14 | Manufacture of camshafts |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8507419D0 GB8507419D0 (en) | 1985-05-01 |
GB2157201A true GB2157201A (en) | 1985-10-23 |
GB2157201B GB2157201B (en) | 1987-06-03 |
Family
ID=10559685
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB848409771A Pending GB8409771D0 (en) | 1984-04-14 | 1984-04-14 | Manufacture of camshafts |
GB08507419A Expired GB2157201B (en) | 1984-04-14 | 1985-03-21 | The manufacture of camshafts |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB848409771A Pending GB8409771D0 (en) | 1984-04-14 | 1984-04-14 | Manufacture of camshafts |
Country Status (7)
Country | Link |
---|---|
US (1) | US4616389A (en) |
EP (1) | EP0159811B1 (en) |
JP (1) | JPS60232833A (en) |
KR (1) | KR850007469A (en) |
CA (1) | CA1238773A (en) |
DE (1) | DE3565482D1 (en) |
GB (2) | GB8409771D0 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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WO1987006863A1 (en) * | 1986-05-16 | 1987-11-19 | Nilsen Sintered Products (Australia) Pty Ltd | Method of making multi-chain sprockets |
AU584811B2 (en) * | 1986-05-16 | 1989-06-01 | Nilsen Sintered Products (Australia) Pty. Ltd. | Method of making multi-chain sprockets |
US5230234A (en) * | 1992-05-11 | 1993-07-27 | Ford Motor Company | Method of making roll-finished gears |
US20140215820A1 (en) * | 2005-01-20 | 2014-08-07 | Otics Corporation | Rotating assembly and its manufacturing method |
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JPS6330655A (en) * | 1986-07-25 | 1988-02-09 | Hitachi Ltd | Manufacture of camshaft |
ES2020951B3 (en) * | 1986-08-12 | 1991-10-16 | Balcke-Durr Ag | PROCEDURE AND DEVICE FOR FIXING PARTS IN A HOLLOW BODY |
JPS63162801A (en) * | 1986-12-26 | 1988-07-06 | Toyo Kohan Co Ltd | Manufacture of screw for resin processing machine |
DE3717190A1 (en) * | 1987-05-22 | 1988-12-15 | Supervis Ets | CAMSHAFT FOR CONTROLLING VALVES IN COMBUSTION ENGINES AND METHOD FOR THEIR PRODUCTION |
DE8713285U1 (en) * | 1987-10-02 | 1987-12-23 | Interatom | Drive shaft with drive elements attached in groups. |
DE3834401A1 (en) * | 1988-10-10 | 1990-04-12 | Sinterstahl Gmbh | METHOD FOR PRODUCING A TUBULAR CAMSHAFT |
US4983797A (en) * | 1989-12-29 | 1991-01-08 | Dana Corporation | Method for manufacturing a composite camshaft |
US5309621A (en) * | 1992-03-26 | 1994-05-10 | Baker Hughes Incorporated | Method of manufacturing a wellbore tubular member by shrink fitting telescoping members |
US5293847A (en) * | 1993-02-16 | 1994-03-15 | Hoffman Ronald J | Powdered metal camshaft assembly |
AT405916B (en) * | 1995-02-16 | 1999-12-27 | Miba Sintermetall Ag | METHOD FOR PRODUCING A CAM FOR A JOINTED CAMSHAFT |
US5710969A (en) * | 1996-03-08 | 1998-01-20 | Camax Tool Co. | Insert sintering |
JPH1136831A (en) * | 1997-07-18 | 1999-02-09 | Toyota Motor Corp | Three-dimensional camshaft and its manufacture |
US6473964B1 (en) | 2000-01-12 | 2002-11-05 | Keystone Investment Corporation | Method of fabricating camshafts |
ES2292725T3 (en) * | 2001-03-12 | 2008-03-16 | Karl Merz | PROCEDURE TO ASSEMBLE A CAMSHAFT. |
US6838046B2 (en) * | 2001-05-14 | 2005-01-04 | Honeywell International Inc. | Sintering process and tools for use in metal injection molding of large parts |
DE10292295D2 (en) * | 2001-05-29 | 2004-05-06 | Reiner Dorner | Process for the rotationally fixed fastening of drive parts on shafts |
US6718924B1 (en) | 2001-09-20 | 2004-04-13 | Dana Corporation | Design and assembly method of a low cost camshaft |
US6770114B2 (en) | 2001-12-19 | 2004-08-03 | Honeywell International Inc. | Densified sintered powder and method |
DE102004032587A1 (en) * | 2004-07-06 | 2006-02-09 | Daimlerchrysler Ag | Method and assembly system for producing a built-up camshaft |
KR100583660B1 (en) * | 2004-08-05 | 2006-05-26 | 두산인프라코어 주식회사 | Method of joining shaft to a hole |
DE102004039302A1 (en) * | 2004-08-13 | 2006-02-23 | Mahle Ventiltrieb Gmbh | Method for producing a camshaft |
CN100467203C (en) * | 2007-04-12 | 2009-03-11 | 吉林大学 | Cam rotary feeder of automatic assembler for milled assembled cam shaft |
DE102007024092A1 (en) * | 2007-05-22 | 2008-11-27 | Mahle International Gmbh | camshaft |
DE102007026824A1 (en) * | 2007-06-06 | 2008-12-11 | Muhr Und Bender Kg | Method for producing cams for assembled camshafts |
US8459220B2 (en) * | 2007-10-16 | 2013-06-11 | Magna Powertrain Inc. | Concentric phaser camshaft and a method of manufacture thereof |
DE102009023612A1 (en) * | 2009-06-02 | 2010-12-09 | Mahle International Gmbh | Cam grinder |
DE102009057633B3 (en) * | 2009-12-09 | 2011-03-31 | Thyssenkrupp Presta Teccenter Ag | Method of making a built camshaft, camshaft body and camshaft |
DE102011079584A1 (en) * | 2011-07-21 | 2013-01-24 | Mahle International Gmbh | Camshaft and associated cam |
BR112014001062A2 (en) * | 2011-07-21 | 2017-02-21 | Mahle Int Gmbh | cam shaft and corresponding production method |
DE102012212625B4 (en) | 2011-07-21 | 2021-09-09 | Mahle International Gmbh | Camshaft and cams |
DE102011087049A1 (en) * | 2011-11-24 | 2013-05-29 | Mahle International Gmbh | Method for joining components on a shaft |
CN102536561B (en) * | 2012-02-28 | 2014-05-07 | 绵阳华晨瑞安汽车零部件有限公司 | Manufacturing method of cam shaft for high-pressure common-rail oil pump, and interference assembly equipment thereof |
DE102013200638A1 (en) * | 2013-01-17 | 2014-07-17 | Mahle International Gmbh | Device for positioning a plurality of functional elements |
DE102014211565B4 (en) | 2014-06-17 | 2023-03-23 | Mahle International Gmbh | Process for the thermal joining of cams on a camshaft tube of a camshaft |
WO2016115104A1 (en) * | 2015-01-16 | 2016-07-21 | Gkn Sinter Metals, Llc | Method of producing composite components using sinter fit |
CN104972277A (en) * | 2015-06-29 | 2015-10-14 | 安庆市吉安汽车零件锻轧有限公司 | Machining technology for transverse rolling cam shaft workblank |
DE102015220979A1 (en) * | 2015-10-27 | 2017-04-27 | Mahle International Gmbh | Device for heating a plurality of functional elements |
US10247053B1 (en) | 2017-10-24 | 2019-04-02 | Joseph Schubeck | Axleless roller valve lifter |
CN115446551B (en) * | 2022-09-29 | 2023-09-01 | 宁波圣龙五湖汽车零部件有限公司 | Camshaft production process |
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US2932983A (en) * | 1958-01-23 | 1960-04-19 | Gen Motors Corp | Cam assembly |
US3222772A (en) * | 1962-10-15 | 1965-12-14 | Gen Motors Corp | Method of mounting a first member nonrotatably and rigidly on a second member |
GB1117816A (en) * | 1965-07-31 | 1968-06-26 | Gkn Screws Fasteners Ltd | Improvements relating to cam shafts |
JPS4924863A (en) * | 1972-07-02 | 1974-03-05 | ||
DE2336241A1 (en) * | 1973-07-17 | 1975-02-06 | Volkswagenwerk Ag | Compound camshaft assembly for combustion engine - consists of shaft carrying separate bearings cams gearwheels etc fixed in correct positions |
US3999277A (en) * | 1974-07-02 | 1976-12-28 | Hiroshi Hamada | Method of manufacturing assembly-type camshaft |
US3962772A (en) * | 1974-09-04 | 1976-06-15 | Michigan Powdered Metal Products, Inc. | Shaft-supported composite high-strength machine element and method of making the same |
JPS5854901B2 (en) * | 1977-09-08 | 1983-12-07 | トヨタ自動車株式会社 | Camshaft manufacturing method and device |
DE2922509A1 (en) * | 1979-05-31 | 1980-12-04 | Mannesmann Ag | METHOD AND DEVICE FOR PRODUCING CAMSHAFT |
JPS5926805B2 (en) * | 1980-09-22 | 1984-06-30 | トヨタ自動車株式会社 | Fixing method of fitting member to shaft part |
-
1984
- 1984-04-14 GB GB848409771A patent/GB8409771D0/en active Pending
-
1985
- 1985-03-21 GB GB08507419A patent/GB2157201B/en not_active Expired
- 1985-03-21 DE DE8585301963T patent/DE3565482D1/en not_active Expired
- 1985-03-21 EP EP85301963A patent/EP0159811B1/en not_active Expired
- 1985-04-12 US US06/722,855 patent/US4616389A/en not_active Expired - Fee Related
- 1985-04-12 CA CA000479066A patent/CA1238773A/en not_active Expired
- 1985-04-13 KR KR1019850002495A patent/KR850007469A/en not_active Application Discontinuation
- 1985-04-15 JP JP60078588A patent/JPS60232833A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1987006863A1 (en) * | 1986-05-16 | 1987-11-19 | Nilsen Sintered Products (Australia) Pty Ltd | Method of making multi-chain sprockets |
AU584811B2 (en) * | 1986-05-16 | 1989-06-01 | Nilsen Sintered Products (Australia) Pty. Ltd. | Method of making multi-chain sprockets |
US5230234A (en) * | 1992-05-11 | 1993-07-27 | Ford Motor Company | Method of making roll-finished gears |
US20140215820A1 (en) * | 2005-01-20 | 2014-08-07 | Otics Corporation | Rotating assembly and its manufacturing method |
Also Published As
Publication number | Publication date |
---|---|
GB8507419D0 (en) | 1985-05-01 |
EP0159811A3 (en) | 1986-05-14 |
EP0159811B1 (en) | 1988-10-12 |
GB2157201B (en) | 1987-06-03 |
GB8409771D0 (en) | 1984-05-23 |
CA1238773A (en) | 1988-07-05 |
DE3565482D1 (en) | 1988-11-17 |
EP0159811A2 (en) | 1985-10-30 |
JPS60232833A (en) | 1985-11-19 |
KR850007469A (en) | 1985-12-04 |
US4616389A (en) | 1986-10-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19970321 |