EP0997212A1 - Dispositif de maintien de cames au cours de leur frettage sur un tube par expansion du tube - Google Patents
Dispositif de maintien de cames au cours de leur frettage sur un tube par expansion du tube Download PDFInfo
- Publication number
- EP0997212A1 EP0997212A1 EP99410146A EP99410146A EP0997212A1 EP 0997212 A1 EP0997212 A1 EP 0997212A1 EP 99410146 A EP99410146 A EP 99410146A EP 99410146 A EP99410146 A EP 99410146A EP 0997212 A1 EP0997212 A1 EP 0997212A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam
- tube
- housings
- cams
- expansion
- 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
Images
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
- B21D53/00—Making other particular articles
- B21D53/84—Making other particular articles other parts for engines, e.g. connecting-rods
- B21D53/845—Making camshafts
-
- 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
- Y10T29/49293—Camshaft making
-
- 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
- Y10T29/49908—Joining by deforming
- Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
- Y10T29/4994—Radially expanding internal tube
-
- 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
- Y10T29/53—Means to assemble or disassemble
- Y10T29/53961—Means to assemble or disassemble with work-holder for assembly
-
- 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
- Y10T29/53—Means to assemble or disassemble
- Y10T29/53996—Means to assemble or disassemble by deforming
Definitions
- the present invention relates to the production of a camshaft by a process of shrinking cams on a tube by tube expansion. It relates more particularly to a cam holding device during hooping.
- Figure 1 schematically illustrates cams in progress hooping on a tube as described, for example, in US Patent No. 4,597,365.
- Several cams 10 are arranged around a tube 12 which initially passes with a slight play in bores of cams 10.
- Cams 10 are maintained at axial and angular positions desired by a holding device not shown in FIG. 1.
- a dudgeon 14 is passed through the tube 12, the diameter is such that the outside diameter of the tube 12 increases to become slightly greater than the internal diameter of the cams 10. As a result, as shown in the section left of Figure 1, a permanent deformation of the tube and a hooping of the latter in the cam bores 10.
- the cams 10 are forged steel cams whose angular position is provided by vés.
- the manufacturing precision of forged cams being insufficient, it is necessary to correct the cams after their hooping on the tube, in order to find the dimensions required.
- Sintered cams are generally produced with such precision that one could do without a rectification if they were properly positioned when hooping.
- Figure 2 illustrates a front view of a sintered cam arranged in a holding device as it was used by the applicant.
- an upper shim is provided 16 and a lower wedge 17 intended to trap the cam 10 and to ensure its angular position during hooping. They also serve to prevent the cam from breaking during hooping.
- the upper shims 16 on the one hand and the lower shims 17 on the other hand are fixed side by side along the tube, for example by bolts which cross holes 19 of wedges.
- An object of the present invention is to provide a cam holding device when hooping on a tube, which allows to obtain a camshaft not requiring no rectification.
- the present invention provides a device for holding sintered cams during their hooping on a tube by expansion of the tube, comprising, for each cam, two wedges intended to trap the cam between they in complementary housing to the contour of the cam.
- the dimensions of the housings are chosen so that the clearance between the housings and the largest cam in a range of predetermined tolerance is as close as possible to zero by excess, the two shims being designed to be pressed one against each other regardless of the dimensions of the cam in the tolerance range.
- the device comprises means for preventing a game from being born between the two shims associated with a cam during the expansion of the tube.
- shims are assembled side by side along the tube in forming two half-housings, these two half-housings being maintained pressed against each other during expansion of the tube by several independent cylinders, distributed on one side of one of the half housings.
- the present invention is based on an analysis of phenomena occurring during hooping using a device holding cam of the type of figure 2.
- Figure 3 shows an example of a cam support according to the invention, taking advantage of lessons learned mentioned above.
- the upper wedges and lower, here designated 16 'and 17' include, according to the invention, housings which are machined to the dimensions of the largest cam within the permitted tolerance range (generally around 30 ⁇ m). More specifically, housing are machined so that the clearance between the largest cam and the shims is strictly greater than zero to the machining precision close (usually about 5 ⁇ m).
- Figure 4 shows a method of closing the housing avoiding this drawback.
- This figure 4 represents, with a view to side, several wedges used for the realization of a tree with cams.
- the shims have the thickness of the cams and they are positioned axially by spacers of adequate thickness, the shims and spacers being assembled, for example, by through bolts going through them.
- spacers are in two halves, one forming with the shims the upper half-housing, and the others forming with the lower wedges the lower half-housing.
- the lower half-housing is placed on the plate 21 a hydraulic press.
- the upper half-housing is plated against the lower half-housing by several cylinders 22 distributed on the upper face of the housing along the axis of the tube 12. These cylinders move independently, and can be pressure supplied independently. With this configuration, by applying sufficient pressure, you avoid the spacing of the shims during the hooping operation, even for the largest cams.
- camshafts obtained thanks to the holding device according to the invention do not require any rectification.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Gears, Cams (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
Description
Claims (3)
- Dispositif de maintien de cames frittées au cours de leur frettage sur un tube par expansion du tube, comprenant, pour chaque came (10), deux cales (16', 17') destinées à emprisonner la came entre elles dans des logements complémentaires au contour de la came, caractérisé en ce que les dimensions des logements sont choisies de manière que le jeu entre les logements et la plus grande came dans une plage de tolérance prédéterminée soit aussi près que possible de zéro par excès, les deux cales étant prévues pour être plaquées l'une contre l'autre quelles que soient les dimensions de la came dans la plage de tolérance.
- Dispositif de maintien selon la revendication 1, caractérisé en ce qu'il comprend des moyens (22) pour empêcher un jeu de naítre entre les deux cales associés à une came lors de l'expansion du tube.
- Dispositif de maintien selon la revendication 2, caractérisé en ce que plusieurs cales (16', 17') sont assemblées côte à côte le long du tube (12) en formant deux demi-boítiers, ces deux demi-boítiers étant maintenus plaqués l'un contre l'autre lors de l'expansion du tube par plusieurs vérins indépendants (22), répartis sur une face de l'un des demi-boítiers.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9813543 | 1998-10-26 | ||
| FR9813543A FR2784925B1 (fr) | 1998-10-26 | 1998-10-26 | Dispositif de maintien de cames au cours de leur frettage sur un tube par expansion du tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0997212A1 true EP0997212A1 (fr) | 2000-05-03 |
| EP0997212B1 EP0997212B1 (fr) | 2003-01-29 |
Family
ID=9532107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99410146A Expired - Lifetime EP0997212B1 (fr) | 1998-10-26 | 1999-10-25 | Dispositif de maintien de cames au cours de leur frettage sur un tube par expansion du tube |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6367140B2 (fr) |
| EP (1) | EP0997212B1 (fr) |
| DE (1) | DE69905117T2 (fr) |
| ES (1) | ES2191405T3 (fr) |
| FR (1) | FR2784925B1 (fr) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE50210811D1 (de) * | 2001-03-12 | 2007-10-11 | Karl Merz | Verfahren zum fügen einer nockenwelle |
| DE102007026824A1 (de) * | 2007-06-06 | 2008-12-11 | Muhr Und Bender Kg | Verfahren zur Herstellung von Nocken für gebaute Nockenwellen |
| DE102007056638B4 (de) * | 2007-11-24 | 2018-02-22 | Usk Karl Utz Sondermaschinen Gmbh | Verfahren und Vorrichtung zur Montage von einem Verbund, insbesondere aus einer Nockenwelle und einem Gehäuse |
| DE102010032746A1 (de) * | 2010-07-29 | 2012-02-02 | Neumayer Tekfor Holding Gmbh | Verfahren zur Fertigung einer Nockenwelle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6297721A (ja) * | 1985-10-22 | 1987-05-07 | Nissan Motor Co Ltd | カムシヤフトの製造方法 |
| US4882825A (en) * | 1983-01-14 | 1989-11-28 | Kokan Kako Co., Ltd. | Method of connecting a tubular member with an annular member |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6167525A (ja) * | 1984-09-11 | 1986-04-07 | Nippon Piston Ring Co Ltd | カムシヤフト |
| US4597365A (en) * | 1985-02-07 | 1986-07-01 | General Motors Corporation | Camshaft assembly and method |
| US4738012A (en) * | 1985-12-31 | 1988-04-19 | Hughes Robert W | Method of making a cam shaft |
| IT1187909B (it) * | 1986-02-14 | 1987-12-23 | Fiat Auto Spa | Albero a distribuzione composito per motori a combustione interna e procedimento per la sua realizzazione |
| ES2020951B3 (es) * | 1986-08-12 | 1991-10-16 | Balcke-Durr Ag | Procedimiento y dispositivo para fijacion de piezas en un cuerpo hueco |
| JP2771312B2 (ja) * | 1990-05-15 | 1998-07-02 | 正信 中村 | カムシャフトの製造装置 |
| US5157832A (en) * | 1990-06-08 | 1992-10-27 | Hughes Robert W | Method of making a cam shaft from cam lobe having orientating means |
| US5220727A (en) * | 1992-06-25 | 1993-06-22 | Hochstein Peter A | Method making cam shafts |
| FR2698303B1 (fr) * | 1992-11-24 | 1994-12-23 | Sintertech | Procédé de frettage d'au moins une pièce métallique ayant un alésage annulaire autour d'un tube métallique, ensemble obtenu et utilisation du procédé. |
| US5437097A (en) * | 1993-06-01 | 1995-08-01 | Matsumoto Heavy Industry Co. Ltd. | Method and apparatus for manufacturing a cam shaft |
| US5406686A (en) * | 1994-02-18 | 1995-04-18 | Hochstein; Peter A. | Deflagration apparatus for making a cam shaft |
-
1998
- 1998-10-26 FR FR9813543A patent/FR2784925B1/fr not_active Expired - Fee Related
-
1999
- 1999-10-25 ES ES99410146T patent/ES2191405T3/es not_active Expired - Lifetime
- 1999-10-25 DE DE69905117T patent/DE69905117T2/de not_active Expired - Lifetime
- 1999-10-25 EP EP99410146A patent/EP0997212B1/fr not_active Expired - Lifetime
- 1999-10-25 US US09/425,984 patent/US6367140B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4882825A (en) * | 1983-01-14 | 1989-11-28 | Kokan Kako Co., Ltd. | Method of connecting a tubular member with an annular member |
| JPS6297721A (ja) * | 1985-10-22 | 1987-05-07 | Nissan Motor Co Ltd | カムシヤフトの製造方法 |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 011, no. 310 (M - 630) 9 October 1987 (1987-10-09) * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69905117T2 (de) | 2003-09-11 |
| US6367140B2 (en) | 2002-04-09 |
| FR2784925A1 (fr) | 2000-04-28 |
| US20010025416A1 (en) | 2001-10-04 |
| FR2784925B1 (fr) | 2001-01-19 |
| EP0997212B1 (fr) | 2003-01-29 |
| DE69905117D1 (de) | 2003-03-06 |
| ES2191405T3 (es) | 2003-09-01 |
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