EP0340128B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Camshaft assembling method and camshaft obtained
Assignee: Valtubes SA
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Filing: 1989-04-26
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Granted: 1993-03-03
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Expires: 2009-04-26
Abstract
Abstract The invention relates to camshafts and especially those for internal combustion engines. The shaft (20) comprises attached cams (22, 23, 24). According to the assembly method, each cam is wedged onto the shaft at the chosen location by annular strips such as (36) which is carried out by plastic deformation of the shaft in an annular zone (37) adjacent to each of the ends of the wall of the hole of the cam (24). Raised features (33, 35) and hollows (32, 34) interact in order to be useful for the angular wedge-fastening of each cam in relation to the shaft. The camshaft thus produced also forms part of the invention. <IMAGE>
Inventors
- 👤 Jean-Paul Lespour
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 01:29
CPC Classifications
B; B21; B21K; B21K25/00; B21D; B21D53/00; B21D53/88; B21K1/00; B21K1/06; B21K1/08; B23; B23P; B23P11/00; F; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F16; F16D; F16D1/00; F16D1/06; F16D1/064; F16D1/072; F16H; F16H53/00; F16H53/02; F16H53/025; B22; B22F; B22F2998/00; B23P2700/00; B23P2700/02
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
208 words
A process for the production of a camshaft with one or more cams fitted thereto, wherein a shaft (1, 20) and at least one cam (3, 12, 24) comprising a hole (2, 13) whose cross-section corresponds to that of the shaft are used, a sufficient clearance being provided between the walls of the shaft and the hole to be able easily to engage said shaft within said hole and then easily displace the cam to the planned location, and wherein, after having reached said location, said cam is fixed to the shaft, characterised in that, in an annular zone adjacent to one at least of the two ends (11, 48, 49) of the hole (2, 13) in said cam (3, 12, 24), there is applied to the outside surface of the shaft (1, 20) a sufficient pressure to cause plastic deformation of the metal so as to upset at least a part thereof, forming an annular bead (10, 36, 47) of which at least a portion at least partially fills the clearance between the walls of the shaft and the hole at the end thereof and thus wedges the cam with respect to the shaft, a complementary means being usde to reinforce the angular fixing of the cam.
Claim 2
Dependent Claim
149 words
A process according to claim 1 characterised in that a sufficient pressure is applied to the outside surface of the shaft (1, 20) to cause plastic deformation of the metal of the shaft, by rolling at least one roller (5, 6) around said shaft in an annular zone adjacent to one at least of the two ends (11, 48, 49) of the hole (2, 13) of the cam, said roller comprising a shaping edge (7, 8, 42, 43, 44, 45) of a profile such that, by virtue of the pressure applied by the roller to the metal of the shaft, at least a portion of said metal is upset in the direction of the end (11, 48, 49) and thus forms the annular bead (10, 36, 47), of which a portion thus fills the clearance (e, e1) between the walls of the shaft and the hole, at least partially.
Claim 3
Dependent Claim
77 words
A process according to claim 2 characterised in that two rollers (5, 6) are simultaneously rollde around the shaft (1, 20), which are in opposite relationship with respect to the axis (X1 - X1, X3 - X3) of the shaft, in such a way that their shaping edges (7, 8, 42, 43, 44, 45) are displaced in the annular zone adjacent to one (11, 48, 49) at least of the two ends of the hole (2, 13).
Claim 4
Dependent Claim
39 words
A process according to claim 3 characterised in that the shaping edges (42, 43, 44, 45) of two rollers are simultaneously rolled in each of the two zones which are adjacent to the ends (48, 49) of the hole.
Claim 5
Dependent Claim
58 words
A process according to one of claims 1 to 4 characterised in that the angular fixing of the cam with respect to the shaft is reinforced by using a shaft of a shape which is not a shape of revolution, the wall of the hole of the cam being of a shape corresponding to that of the shaft.
Claim 6
Dependent Claim
127 words
A process according to one of claims 1 to 4 characterised in that the walls of the hole (2, 13) of the cam (3, 12, 24) and of the shaft (1, 20) are of a general shape of revolution and that the angular fixing of the cam (12) with respect to the shaft is reinforced by forming at least one recess (14, 15, 15A, 16) or a raised portion (17, 18, 18A, 19) in the immediate vicinity of at least one end of the hole (13) so that, upon plastic deformation of the metal of the shaft, the metal which is upset in the direction of said end of the hole co-operates with said recess or said raised portion to provide effective angular fixing of the cam.
Claim 7
Dependent Claim
28 words
A process according to claim 6 characterised in that a plurality of recesses or raised portions are distributed around the axis (X2 - X2) of the hole (13).
Claim 8
Dependent Claim
43 words
A process according to claim 6 or claim 7 characterised by producing at least one recess or raised portion in the form of a groove or a rib from one end of the wall of the hole of the cam to the other.
Claim 9
Dependent Claim
134 words
A process according to claim 8 characterised by producing on at least one of the two corresponding walls of the shaft (20) and of the hole of the cam (24) a plurality of ribs (26, 28) capable of engaging into grooves (32, 34) which are produced on the other surface of revolution so as to permit engagement of the shaft into the hole of the cam with a given angular fixing of the latter, which is selected from a plurality thereof, the subsequent upsetting of the metal of the shaft (20) with the formation of a bead (36, 47) in an annular zone adjacent to at least one end (48, 49) of the hole making it possible to eliminate the clearance which may exist between ribs and grooves in said annular zone (50, 51).
Claim 10
Dependent Claim
31 words
A process according to claim 9 characterised in that the ribs (26, 28, 30) and grooves (32, 34) are formed on the surfaces of revolution in parallel relationship to the generatrices.
Claim 11
Dependent Claim
42 words
A process according to claim 9 or claim 10 characterised by forming an alternate arrangement of grooves and ribs on the shaft (60) by rolling at least one roller (67, 68) against the shaft with a sufficient pressure along a helical path.
Claim 12
Dependent Claim
40 words
A process according to one of claims 1 to 11 characterised in that not only at least one cam but also at least one other component such as a bearing, gear, puller or the like is fixed to the shaft.
Claim 13
Dependent Claim
205 words
A camshaft with one or more cams fitted thereto comprising at least one cam (3, 12, 24), in the interior of the hole (2, 13) of which is engaged a shaft whose outside wall corresponds to that of the hole with an initial clearance (e, e1) sufficient to permit easy engagement of said shaft into said hole and easy displacement of the cam to the planned location, characterised in that it comprises, in at least one zone adjacent of the ends (11, 48, 49) of the hole of at least one cam (3, 24) an annular bead (10, 36, 47) of increased thickness which is produced by upsetting of the metal of the shaft (1, 20) by virtue of plastic deformation produced by a pressure applied to its outside surface in an annular zone adjacent to the corresponding end (11, 48, 49) of the hole (2, 13), a portion of said bead at least partially filling the annular space at the entry zone (11, 48, 49) of the hole (2) between the wall thereof and the corresponding wall of the shaft (1, 20), and that at least a portion of the bead co-operates with a complementary means which reinforces the angular fixing of the cam.
Claim 14
Dependent Claim
53 words
A camshaft with one or more cams according to claim 13 characterised in that, when a single bead (10) is formed at one (11) of the two ends only of the hole (2) of a cam (3), said cam bears against an abutment means (4) disposed at the other end of said hole.
Claim 15
Dependent Claim
89 words
A camshaft with one or more cams according to claim 13 or claim 14 characterised in that, besides at least one cam, it comprises at least one other fitted component such as a bearing, a gear, a pulley or the like, provided with a hole whose wall has a clearance with respect to the shaft, said clearance being partially filled at one at least of the two ends of the hole by a portion of a bead which is formed by plastic deformation of the metal of the shaft.
Claim 16
Dependent Claim
102 words
A camshaft with one or more cams according to one of claims 13 to 15 characterised in that the facing walls of the shaft (1, 20) and the hole of the cam (3, 24) or other component are of a general shape of revolution and that the hole (13) of at least one cam (12) or other component comprises at least one recess (14, 15, 15A, 16) and/or raised portion (17, 18, 18A, 19) formed in the immediate vicinity of at least one end of the hole (13) which co-operates or co-operate with at least a portion of at least one bead.
Claim 17
Dependent Claim
50 words
A camshaft according to claim 16 characterised in that one at least of the two facing walls of revolution comprise at least a plurality of raised portions in the form of ribs (26, 28) which are engaged in recesses in the form of grooves (32, 34) in the other wall.
Claim 18
Dependent Claim
27 words
A camshaft having one or more cams according to claim 17 characterised in that the shaft (60) comprises an alternate arrangement of ribs and grooves forming splines.
Claim 19
Dependent Claim
34 words
A camshaft with one or more cams according to one of claims 13 to 18 characterised in that it comprises at least one cam or other component of sinterde or forged and sintered metal.
Claim 20
Dependent Claim
24 words
A camshaft with one or more cams according to one of claims 13 to 19 characterised in that the shaft (20, 60) is hollow.
References Cited (Backward Citations)
No citation records indexed.
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