Patent EP0452671A2 successfully refreshed from Google Patents.
EP0452671A2
Expired / Lapsed
EP
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Valve actuating mechanism in four-stroke cycle engine
Assignee: Suzuki Co Ltd
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Filing: 1991-03-12
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Granted: —
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Expires: 2011-03-12
Abstract
Abstract A valve actuating mechanism disposed in a four-stroke cycle engine in which exhaust and suction valves are disposed, comprises a rocker shaft (11) rotatably supported to a cylinder head (21) of an engine unit and having eccentric large-diameter portions (12,13) formed as bushings on the way of the rocker shaft, rocker arms including a first rocker arm (7) rotatably mounted directly on the rocker shaft and second and third rocker arms (8,9) rotatably mounted on the bushings with the first rocker arm being interposed therebetween, and a cam assembly including first, second and third cam members (3,4,5) which drives the first, second and third rocker arms, respectively. The second and third cams have the same cam profiles and the first cam has a cam profile different from those of the second and third cams. A driving mechanism for rotating the rocker shaft is connected to one end of the rocker shaft and comprises a hydraulic cylinder (15), a rack (16) connected thereto and a pinion (17) formed on the one end of the rocker shaft so as to be engaged with the rack from the upper side of the cylinder head. A stopper mechanism for controlling a sliding position of the rocker shaft is composed of a stopper groove formed to the cylinder head, a stopper screw (36) engaged with the stopper groove (32) and a stopper member disposed to the other end portion of the rocker shaft.
Inventors
- 👤 Shinji Kaku
- 👤 Tatsuya Shinkai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 18:57
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/26; F01L1/267; F01L1/20; F01L13/00; F01L13/0015; F01L13/0036; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
176 words
A valve actuating mechanism disposed in a four-stroke cycle engine in which exhaust and suction valves are disposed, comprising: a cocker shaft rotatably supported to a cylinder head of an engine unit and having eccentric large-diameter portions formed on the way of the rocker shaft; rocker arm means including a first rocker arm rotatably mounted directly on the rocker shaft and second and third rocker arms rotatably mounted on the eccentric large-diameter portions of the rocker shaft with the first rocker arm being interposed therebetween; cam means including first, second and third cam members which drives said first, second and third rocker arms, respectively, said second and third cams having same cam profiles and said first cam having a cam profile different from those of said second and third cams; and a stopper mechanism for controlling a sliding position of said rocker shaft, said stopper mechanism including a stopper groove formed to said cylinder head, a stopper screw engaged with the stopper groove and a stopper means disposed to one end portion of said rocker shaft.
Claim 2
Dependent Claim
92 words
A valve actuating mechanism according to claim 1, wherein said stopper means is composed of a groove means formed to an outer periphery of the one end of the rocker shaft and including a positioning groove extending in a circumferential direction thereof into which a front portion of the stopper screw is fitted for limiting a rotating position of said rocker shaft and a slide groove being formed continuously to the positioning groove and extending in an axial direction of the rocker shaft in and along which the rocker shaft is slid.
Claim 3
Dependent Claim
41 words
A valve actuating mechanism according to claim 2, wherein said groove means further comprises a slide hold goove being formed continuously to the slide groove and extending in the circumferential direction of the rocker shaft for holding the slid position thereof.
Claim 4
Dependent Claim
48 words
A valve actuating mechanism according to at least one of the preceding claims, wherein said first rocker arm and said first cam are located for a low speed operation and said second and third rocker arms and second and third cams are located for an intermediate-high speed operation.
Claim 5
Dependent Claim
47 words
A valve actuating mechanism according to at least one of the preceding claims, wherein said eccentric large-diameter portions are formed by eccentric bushings each having a diameter larger than a diameter of said rocker shaft, said bushings axial centers eccentric from a center of said rocker shaft.
Claim 6
Dependent Claim
49 words
A valve actuating mechanism according to at least one of the preceding claims, wherein the first rocker arm is provided with branched distal ends and distal ends of said second and third rocker arms abut against each of the branched distal ends of said first rocker arm through shims.
Claim 7
Dependent Claim
36 words
A valve actuating mechanism according to at least one of the preceding claims, wherein said branched distal ends of said first rocker arm are operatively connected to said exhaust and suction valves disposed in the engine.
Claim 8
Dependent Claim
168 words
A valve actuating mechanism disposed in a four-stroke cycle engine in which exhaust and suction valves are disposed, comprising: a rocker shaft rotatably supported to a cylinder head of an engine unit and having eccentric large-diameter portions formed on the way of the rocker shaft; rocker arm means including a first rocker arm rotatably mounted directly on the rocker shaft and second and third rocker arms rotatably mounted on the eccentric large-diameter portions of the rocker shaft with the first rocker arm being interposed therebetween; cam means including first, second and third cam members which drives said first, second and third rocker arms, respectively, said second and third cams having same cam profiles and said first cam having a cam profile different from those of said second and third cams; a drive mechanism connected to one end portion of said rocker shaft for driving said rocker shaft; and a stopper mechanism disposed to another end of said rocker shaft for positioning a rotating position of said rocker shaft.
Claim 9
Dependent Claim
42 words
A valve actuating mechanism according to claim 8, wherein said stopper mechanism includes a stopper groove formed to said cylinder head, a stopper screw engaged with the stopper groove and a stopper means disposed to one end portion of said rocker shaft.
Claim 10
Dependent Claim
92 words
A valve actuating mechanism according to claim 9, wherein said stopper means is composed of a groove means formed to an outer periphery of the one end of the rocker shaft and including a positioning groove extending in a circumferential direction thereof into which a front portion of the stopper screw is fitted for limiting a rotating position of said rocker shaft and a slide groove being formed continuously to the positioning groove and extending in an axial direction of the rocker shaft in and along which the rocker shaft is slid.
Claim 11
Dependent Claim
41 words
A valve actuating mechanism according to claim 10, wherein said groove means further comprises a slide hold goove being formed continuously to the slide groove and extending in the circumferential direction of the rocker shaft for holding the slid position thereof.
Claim 12
Dependent Claim
43 words
A valve actuating mechanism according to claim 8, wherein said first rocker arm and said first cam are located for a low speed operation and said second and third rocker arms and second and third cams are located for an intermediate-high speed operation.
Claim 13
Dependent Claim
42 words
A valve actuating mechanism according to claim 8, wherein said eccentric large-diameter portions are formed by eccentric bushings each having a diameter larger than a diameter of said rocker shaft, said bushings axial centers eccentric from a center of said rocker shaft.
Claim 14
Dependent Claim
44 words
A valve actuating mechanism according to claim 9, wherein the first rocker arm is provided with branched distal ends and distal ends of said second and third rocker arms abut against each of the branched distal ends of said first rocker arm through shims.
Claim 15
Dependent Claim
31 words
A valve actuating mechanism according to claim 9, wherein said branched distal ends of said first rocker arm are operatively connected to said exhaust and suction valves disposed in the engine.
Claim 16
Dependent Claim
185 words
A valve actuating mechanism disposed in a four-stroke cycle engine in which exhaust and suction valves are disposed, comprising: a rocker shaft rotatably supported to a cylinder head of an engine unit and having eccentric large-diameter portions formed on the way of the rocker shaft; rocker arm means including a first rocker arm rotatably mounted directly on the rocker shaft and second and third rocker arms rotatably mounted on the eccentric large-diameter portions of the rocker shaft with the first rocker arm being interposed therebetween; cam means including first, second and third cam members which drives said first, second and third rocker arms, respectively, said second and third cams having same cam profiles and said first cam having a cam profile different from those of said second and third cams; and a driving mechanism connected to one end of said rocker shaft for driving the rocker shaft, said driving mechanism including a drive means, a rack member operatively connected to said drive means and a pinion member formed to the one end of said rocker shaft so as to be engageable with said rack member.
Claim 17
Dependent Claim
21 words
A valve actuating mechainsm according to claim 16, wherein said drive means is a hydraulic cylinder means including a piston member.
Claim 18
Dependent Claim
25 words
A valve actuating mechanism according to claim 16, wherein said rack member is engaged with said pinion from an upper side of the cylinder head.
Claim 19
Dependent Claim
63 words
A valve actuating mechanism according to claim 16 further comprising a stopper mechanism disposed to another end of the rocker shaft for positioning a rotaing position of the rocker shaft, said stopper mechanism including a stopper groove formed to said cylinder head, a stopper screw engaged with the stopper groove and a stopper means disposed to one end portion of said rocker shaft.
Claim 20
Dependent Claim
92 words
A valve actuating mechanism according to claim 19, wherein said stopper means is composed of a groove means formed to an outer periphery of the one end of the rocker shaft and including a positioning groove extending in a circumferential direction thereof into which a front portion of the stopper screw is fitted for limiting a rotating position of said rocker shaft and a slide groove being formed continuously to the positioning groove and extending in an axial direction of the rocker shaft in and along which the rocker shaft is slid.
Claim 21
Dependent Claim
41 words
A valve actuating mechanism according to claim 20, wherein said groove means further comprises a slide hold goove being formed continuous to the slide groove and extending in the circumferential direction of the rocker shaft for holding the slid position thereof.
Claim 22
Dependent Claim
43 words
A valve actuating mechanism according to claim 16, wherein said first rocker arm and said first cam are located for a low speed operation and said second and third rocker arms and second and third cams are located for an intermediate-high speed operation.
Claim 23
Dependent Claim
42 words
A valve actuating mechanism according to claim 16, wherein said eccentric large-diameter portions are formed by eccentric bushings each having a diameter larger than a diameter of said rocker shaft, said bushings axial centers eccentric from a center of said rocker shaft.
Claim 24
Dependent Claim
44 words
A valve actuating mechanism according to claim 16, wherein the first rocker arm is provided with branched distal ends and distal ends of said second and third rocker arms abut against each of the branched distal ends of said first rocker arm through shims.
Claim 25
Dependent Claim
31 words
A valve actuating mechanism according to claim 24, wherein said branched distal ends of said first rocker arm are operatively connected to said exhaust and suction valves disposed in the engine.
References Cited (Backward Citations)
No citation records indexed.
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