EP1432890A1 - Camshaft and method for making same - Google Patents
Camshaft and method for making sameInfo
- Publication number
- EP1432890A1 EP1432890A1 EP02758031A EP02758031A EP1432890A1 EP 1432890 A1 EP1432890 A1 EP 1432890A1 EP 02758031 A EP02758031 A EP 02758031A EP 02758031 A EP02758031 A EP 02758031A EP 1432890 A1 EP1432890 A1 EP 1432890A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- camshaft
- diameter
- cams
- ground
- 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
-
- 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
-
- 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
Definitions
- the invention relates to a camshaft for receiving cams according to the preamble of claim 1 and a method for producing a camshaft for mounting cams according to the preamble of claim 4.
- Camshafts of this type are used to control machine parts, in particular to control parts in internal combustion engines, such as for valves.
- composite camshafts also referred to as built-up camshafts
- control cams are mounted on the camshaft and fastened at the intended location, for example by welding or pressing with the shaft.
- the control shaft can consist of both solid material and tube material.
- cams can also be produced from sheet metal, for example by sheet metal forming, as has become known, for example, from published documents DE 196 40 872, DE 100 24 553 and US Pat. No. 5,201,246.
- camshafts In addition to the cams mounted on the camshafts, partial areas are provided on the camshafts, on which the shaft is rotatably mounted in slide bearing blocks of the cylinder head. High precision requirements are placed on the camshaft bearing in order to absorb the forces that occur when the shaft rotates and to ensure a good lubricating film in the bearing.
- the surface properties of the shaft in the areas of the bearings are therefore subject to certain requirements with regard to precision and roughness.
- the cam contours that the levying He ⁇ curves of the gas control valves determine very high on ⁇ requirements on the surface quality in terms of Precision and roughness.
- Camshafts are therefore often ground as a whole after assembly. Both the cams and the bearing points and possibly other functional surfaces are ground.
- the object of the invention is to eliminate the disadvantages of the prior art.
- the object is to realize a camshaft with a suitable production method which makes it possible to produce bearings with consistently high quality, and this at high viability ⁇ host.
- the object is achieved according to the invention by the formation of a camshaft according to the features of claim 1 and by a manufacturing method according to the features of claim 4.
- the dependent claims define further advantageous configurations of the camshaft or of the manufacturing method.
- the object is achieved in that the camshaft is ground in the region of the future bearing points before the camshaft assembly, and in such a way that the sensitive bearing points have a smaller diameter than the main diameter of the shaft.
- the bearing points are advantageously ground simultaneously, that is to say with a single operation. This allows a particularly economical production with good and consistent quality.
- a further advantageous simplification results if the shaft is designed as a tube. This can further save weight and material.
- the procedure according to the invention drastically reduces the risk of damage to the bearing points during the assembly of the cams.
- the cams are pulled onto the shaft, since their opening corresponds to the larger shaft diameter, they can be guided over the bearing points without damaging them and attached to the intended location.
- a further advantage is that the grinding time is shortened because the required dimensional accuracy for grinding ge ⁇ is ringer for the axial position of the bearing.
- the hitherto additional recesses laterally of the bearing no longer be provided erforder ⁇ are Lich.
- the further completion of the camshaft can then be carried out using one of the customary known methods.
- the camshaft and method according to the invention are advantageously suitable for all types of cams.
- cams made of sheet metal material is particularly suitable for the camshaft designed according to the invention, since this enables a great saving in weight and a particularly economical manufacture of the camshaft as a whole can be achieved. It is also advantageous to produce the sheet metal cam from a bar profile profiled in cam shape, which is cut to the width of the cam to be created and is then joined, for example, by welding or pressing onto the shaft at the location provided for this purpose.
- the inventive method now offers further advantages.
- the shaft can be held in one or more storage areas during the grinding operation. This increases the precision of the cam contour and reduces the susceptibility to errors.
- Fig. 1 shows an inventive camshaft in cross section with ground bearings
- Fig. 2 shows a camshaft with a ground bearing point and a cam arranged next to it in cross section
- Fig. 3 is an enlarged view of a camshaft with ground bearings
- Fig. 4 shows an arrangement for through grinding of camshafts
- Fig. 5 shows an arrangement for plunge grinding of bearings with a grinding wheel set
- Fig. 6 shows a grinding arrangement for camshafts for plunge grinding with a wide profiled grinding wheel
- FIG. 7 shows a grinding arrangement with a grinding wheel set for grinding jointly bearing points, cam setting stations and receptacles on the camshaft
- FIG. 1 shows a camshaft 5 for receiving cams and for receiving camshaft bearings, which, according to the invention, is ground to a certain diameter dimension on the shaft surface at least in some areas.
- the camshaft 5 is advantageously tubular to save material and weight.
- the surface of this shaft 5 is ground at least in areas where future, the shaft 5 is to be stored in the so-called bearing points 51 or round and ground to a smaller diameter Mass ge ⁇ geninate the original shaft diameter the larger shaft diameter.
- the inserted ⁇ schliffene smaller diameter of the shaft 5 is intended in relation to the shaft diameter to a few hundredths to a few tens of tel mm be smaller.
- the cams 6 to be mounted on the shaft 5 can be mounted without damaging the sensitive bearing points 51 and attached to the shaft 5 at the location 7 provided for this purpose.
- the shaft 5 is thus ground before the camshaft assembly.
- the future bearing points 51 are all ground at the same time in such a way that the sensitive bearing point 51 has a somewhat thinner diameter, as a result of which the risk of damage during the subsequent assembly of the cams 6 is reduced.
- Another advantage is that the grinding time can be shortened and the required dimensional accuracy in the axial direction for positioning the bearings is reduced.
- the often customary additional punctures on the side of the bearings to be arranged in the shaft 5 are no longer necessary due to the procedure according to the invention.
- the procedure according to the invention can thus reduce the amount of work and increase the quality of the arrangement.
- cams 6 are advantageously used, which are embodied as a sheet metal construction, as shown in cross section in FIG. 2.
- Such sheet metal cams are, for example, T-shaped in cross section and are advantageously connected to one another from a first angled sheet metal part 1 and a second angled sheet metal part 2 to form a T-shaped cam part which has a precise running surface on the outside, which can also be opened as required Dimension and can be ground according to the desired curve shape.
- Such sheet metal parts can be mass-produced in a simple manner, for example as pressed sheet metal half-shells.
- positioning means 11 can be provided on the sheet metal parts 1, 2, which, for example can be created as a knob or dent by pressing into the sheet metal parts.
- the sheet metal parts 1, 2 additionally have an opening designed according to the shaft 5, which make it possible to pull the cam 6 formed therefrom onto the shaft.
- a sleeve 3 is pressed between the sheet metal cam 6 and the shaft 5.
- the sleeve 3 is made of softer material and the sheet metal parts 1, 2 of the sheet metal cam 6 are made of hardenable material. It is also helpful for simple assembly if the sleeve 3 has a collar on one side.
- a roller 7 is provided in the area of the cam setting position on the shaft 5, which produces a slight oversize in this area compared to the shaft diameter.
- the cam 6 with its opening can be correspondingly simply pulled onto the shaft 5 and pressed in the area of this curling 7.
- cams made of solid material are far preferred, on the one hand for reasons of weight and on the other hand for cost reasons, and in combination with the shaft ground according to the invention, it is possible to place the bearings very close to the cam 6 because, as shown in FIG. 2, the bearing points 51 is can even be ground in such a way that bearings can be brought to close to the cam 6 mounted or 6 can cut even under the outer contour of the cam slightly as the distance d by name in Fig. 2 Darge ⁇ represents.
- the inventive grinding of the bearing points 51 on the camshaft 5 no additional puncturing operations for positioning and delimitation of the bearing points are necessary, as is customary in the prior art.
- the corresponding shape of the end regions of the ground bearing points 51 can be predetermined.
- the original diameter of the shaft 5 is denoted by RD and the ground bearing diameter by LD.
- LB is the width of the bearing
- SB is the width of the disc run-out. The beveling in the edge area of the bearing width LB can additionally prevent the canting when the cams 6 are pulled open.
- the procedure for producing a completely ground shaft 5 is as follows.
- the shaft 5 is ground over its entire length to its outer diameter RD by a wide grinding roller SW1 and a regulating wheel SW2, as shown in FIG. 4 in longitudinal section.
- regulating wheels are used to position the grinding wheels or to adjust the grinding mass (see Dubbel, page T93, Figure 49).
- the shaft 5 is then ground to the desired reduced bearing diameter dimension LD using grinding wheels S1 and the regulating wheels S2, which are arranged at the corresponding axial position opposite the shaft 5, where the corresponding bearing points 51 are to be ground, as shown in FIG. 5 is shown.
- the disks can be designed in the edge area according to the desired outlet shape, for example for one Transition from diameter LD to RD, which is formed obliquely.
- FIG. 6 shows a further preferred variant with a wide profiled grinding wheel SW1 and a wide profiled control wheel SW2 in section. This solution enables the simultaneous plunge grinding of bearing points and the grinding of the shaft diameter RD together.
- a further preferred embodiment of the procedure according to the invention consists in that the shaft with its outer diameter RD remains uncut between the bearing points 51 and the cam setting position 7.
- the procedure here is very efficient since the entire grinding process can be carried out simultaneously, the bearing points 51 being ground to the smallest shaft diameter according to the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH17802001 | 2001-09-27 | ||
CH178001 | 2001-09-27 | ||
PCT/CH2002/000491 WO2003027446A1 (en) | 2001-09-27 | 2002-09-09 | Camshaft and method for making same |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1432890A1 true EP1432890A1 (en) | 2004-06-30 |
EP1432890B1 EP1432890B1 (en) | 2007-07-25 |
Family
ID=4566250
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02758031A Expired - Lifetime EP1432890B1 (en) | 2001-09-27 | 2002-09-09 | Camshaft and method for making same |
Country Status (6)
Country | Link |
---|---|
US (1) | US20040244528A1 (en) |
EP (1) | EP1432890B1 (en) |
AT (1) | ATE368174T1 (en) |
DE (1) | DE50210565D1 (en) |
ES (1) | ES2288557T3 (en) |
WO (1) | WO2003027446A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10219195C1 (en) * | 2002-04-29 | 2003-11-27 | Thyssen Krupp Automotive Ag | One-piece cam |
DE102007013039A1 (en) | 2007-03-19 | 2008-09-25 | Schaeffler Kg | Method of arranging an undivided rolling bearing on a shaft and rolling bearing therefor |
US8887682B2 (en) * | 2012-12-11 | 2014-11-18 | Mahle International Gmbh | Low friction camshaft |
DE102013210403A1 (en) | 2013-06-05 | 2014-12-11 | Mahle International Gmbh | Method for producing a camshaft |
DE102014106924A1 (en) | 2014-05-16 | 2015-11-19 | Thyssenkrupp Presta Teccenter Ag | Method of making a built camshaft |
Family Cites Families (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1984936A (en) * | 1932-12-01 | 1934-12-18 | Norton Co | Grinding wheel |
US2284606A (en) * | 1939-10-13 | 1942-05-26 | Norton Co | Camshaft bearing grinding machine |
US4419845A (en) * | 1980-03-25 | 1983-12-13 | Ernst Thielenhaus Kg | Method of and apparatus for finish-grinding a camshaft |
JPS61290271A (en) * | 1985-06-18 | 1986-12-20 | Nippon Piston Ring Co Ltd | Hollow cam shaft |
DE3536296C1 (en) * | 1985-10-11 | 1987-03-26 | Supervis Ets | camshaft |
DE8626272U1 (en) * | 1986-10-01 | 2000-08-17 | Emitec Gesellschaft für Emissionstechnologie mbH, 53797 Lohmar | Built camshaft from a shaft tube and pushed elements |
DE3717190A1 (en) * | 1987-05-22 | 1988-12-15 | Supervis Ets | CAMSHAFT FOR CONTROLLING VALVES IN COMBUSTION ENGINES AND METHOD FOR THEIR PRODUCTION |
DE3740597A1 (en) * | 1987-11-30 | 1989-06-08 | Grieshaber Masch | FLEXIBLE MULTI-STATIONARY MACHINE FOR MACHINING ROTATIONAL SYMMETRIC SURFACES |
JP3163505B2 (en) * | 1991-06-07 | 2001-05-08 | 日本ピストンリング株式会社 | Mechanical element obtained by press-fitting a shaft into a fitting member and method for manufacturing the same |
DE4121951C1 (en) * | 1991-07-03 | 1992-12-24 | Supervis Ets | |
US5280675A (en) * | 1992-07-13 | 1994-01-25 | The Torrington Company | Camshaft and method of making a camshaft |
US5201246A (en) * | 1992-07-20 | 1993-04-13 | General Motors Corporation | Lightweight composite camshaft |
US5371973A (en) * | 1992-09-30 | 1994-12-13 | Western Atlas Inc. | Grinding machine utilizing multiple, parallel, abrasive belts simultaneously grinding surfaces on a workpiece |
US5437097A (en) * | 1993-06-01 | 1995-08-01 | Matsumoto Heavy Industry Co. Ltd. | Method and apparatus for manufacturing a cam shaft |
DE4320945C2 (en) * | 1993-06-24 | 1996-05-23 | Grieshaber Masch | Belt grinder |
DE19608983A1 (en) * | 1995-03-17 | 1996-09-19 | Volkswagen Ag | Camshaft for motor vehicle IC-engine |
DE19640872C2 (en) | 1996-10-04 | 1999-07-01 | Ind Fahrzeugtechnik Gmbh & Co | Cam for built camshaft |
DE19828239A1 (en) * | 1998-06-25 | 2000-01-13 | Hegenscheidt Mfd Gmbh | Device for machining workpieces |
EP1121223B1 (en) * | 1998-06-25 | 2002-12-18 | Unova U.K. Limited | Apparatus and method for grinding composite workpieces |
GB2338912A (en) * | 1998-06-30 | 2000-01-12 | Cummins Engine Co Ltd | Method of manufacturing a camshaft |
US6182361B1 (en) | 1999-05-20 | 2001-02-06 | The Torrington Company | Method for assembling a camshaft |
DE19938791B4 (en) * | 1999-08-16 | 2004-07-29 | Erich Neumayer Gmbh & Co Kg | Process for producing a built shaft and device for carrying out this process |
JP3787248B2 (en) * | 1999-09-30 | 2006-06-21 | 株式会社ジェイテクト | Method and apparatus for controlling sizing of machine tool |
US6473964B1 (en) * | 2000-01-12 | 2002-11-05 | Keystone Investment Corporation | Method of fabricating camshafts |
US6932675B1 (en) * | 2004-02-04 | 2005-08-23 | General Motors Corporation | Plated grinding wheel life maximization method |
DE102004056802A1 (en) * | 2004-11-24 | 2006-06-01 | Naxos-Union Gmbh | Grinding machine for wavy workpieces |
-
2002
- 2002-09-09 AT AT02758031T patent/ATE368174T1/en not_active IP Right Cessation
- 2002-09-09 EP EP02758031A patent/EP1432890B1/en not_active Expired - Lifetime
- 2002-09-09 US US10/487,903 patent/US20040244528A1/en not_active Abandoned
- 2002-09-09 WO PCT/CH2002/000491 patent/WO2003027446A1/en active IP Right Grant
- 2002-09-09 ES ES02758031T patent/ES2288557T3/en not_active Expired - Lifetime
- 2002-09-09 DE DE50210565T patent/DE50210565D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO03027446A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE368174T1 (en) | 2007-08-15 |
WO2003027446A1 (en) | 2003-04-03 |
DE50210565D1 (en) | 2007-09-06 |
EP1432890B1 (en) | 2007-07-25 |
US20040244528A1 (en) | 2004-12-09 |
ES2288557T3 (en) | 2008-01-16 |
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