EP0520518A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Induction system for an internal combustion engine
Assignee: Yamaha Motor Co Ltd
•
Filing: 1992-06-29
•
Granted: —
•
Expires: 2012-06-29
Abstract
Abstract The present invention relates to an induction system (22) for an internal combustion engine (11) having a cylinder head (18) and a cylinder block (12), said cylinder head (18) at least partially defining a combustion chamber (21), and an intake passage arrangement (22) for each cylinder to serve a plurality of intake valves (35), said intake passage arrangement (22) being controlled by a control valve (54) which is rotatably supported at a lower side of the intake passage arrangement (22) in the cylinder head (18) wherein the axis of the control valve (54) extends transversely to the flow path of an intake charge through the intake passage arrangement (22) and at a bight of the intake passage (33,34) and a rectifier plate (57) having a cylindrical base portion (58) and a rectifier plate portion (59) which extends integrally upwardly from the cylindrical base portion (58) into a respective intake passage (33) controlled by said control valve (54). More specifically, the cylindrical base portion (58) is received within a cylinder head counterbore (38) beneath a poppet valve seat (37) while an upstream edge (62) of the rectifier plate portion (59) forms a stop of a valve cut-out (56) of the control valve (54) said rectifier plate portion (59) being designed to comprise an integral bent portion (61) providing a clearance for a stem of the intake valve (35).
Inventors
- 👤 Yoshiharu Isaka
- 👤 Masahiro Ito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 12:27
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/10006; F02M35/10078; F02M35/10085; F01; F01L; F01L3/00; F01L3/06; F02B; F02B31/00; F02B31/04; F02B31/06; F02B31/08; F02B31/085; F02D; F02D9/00; F02D9/08; F02D9/12; F02D9/16; F02M35/10242; F02M35/10262; F02M35/104; F02M35/108; F02M35/1085; F02B1/00; F02B1/02; F02B1/04; F02B2275/00; F02B2275/18; F02B2275/48; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F2001/244; F02F2001/245; F02M35/1015; F02M35/10196; F02M35/10209; F02M35/10216; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
133 words
Induction system for an internal combustion engine having a cylinder head and a cylinder block, said cylinder head at least partially defining a combustion chamber, and an intake passage arrangement for each cylinder to serve a plurality of intake valves, said intake passage arrangement being controlled by a control valve (54) which is rotatably supported at a lower side of the intake passage arrangement (33,34) in the cylinder head (18) wherein the axis of the control valve (54) extends transversely to the flow path of the intake charge through the intake passage arrangement (33,34), said control valve (54) being disposed at a bight of the intake passage (33,34) in proximity to the combustion chamber, characterised in that a rectifier plate arrangement is disposed within an downstream end portion of an intake passage (33,34).
Claim 2
Dependent Claim
31 words
Induction system as claimed in claim 1, characterised in that said rectifier plate arrangement extends from a valve seat portion of an intake valve assembly upwardly into the intake passage (33,34).
Claim 3
Dependent Claim
50 words
Induction system as claimed in claims 1 or 2, characterised in that the rectifier plate (57) has a cylindrical base portion (58) and a rectifier plate portion (59) which extends integrally upwardly from the cylindrical base portion (58) into the respective intake passage (33,34) controlled by said control valve (54).
Claim 4
Dependent Claim
35 words
Induction system as claimed in at least one of the preceding claims 1-3, characterised in that the cylindrical base portion (58) is received within a cylinder head counterbore (38) beneath the intake valve seat (37).
Claim 5
Dependent Claim
42 words
Induction system as claimed in at least one of the preceding claims 1-4, characterised in that an upstream edge of the rectifier plate portion (59) is adapted to form a stop (62) of a valve cut-out (56) of the control valve (54).
Claim 6
Dependent Claim
41 words
Induction system as claimed in at least one of the preceding claims 1-5, characterised in that said rectifier plate portion (59) is designed to comprise an integral bent portion providing a clearance for a stem of the associated intake valve (35).
Claim 7
Dependent Claim
34 words
Induction system as claimed in at least one of the preceding claims 1-6, characterised in that said rectifier plate portion (59) comprises a semi-cylindrical depression (61) for the stem of the intake valve (35).
Claim 8
Dependent Claim
36 words
Induction system as claimed in at least one of the preceding claims 1-7, characterised in that said rectifier plate portion (59) has a generally V-shaped configuration serving as a flow guide portion for the intake charge.
Claim 9
Dependent Claim
31 words
Induction system as claimed in at least one of the preceding claims 1-8, characterised in that said rectifier plate divides a primary intake passage (33) into two substantially equal flow areas.
Claim 10
Dependent Claim
49 words
Induction system as claimed in at least one of the preceding claims 1-9, characterised in that said rectifier plate portion (59) provides a flow area substantially smaller than one from half of the cross-section of the intake passage (33,34) when the control valve (54) is in its closed position.
Claim 11
Dependent Claim
48 words
Induction system as claimed in at least one of the preceding claims 1-10, characterised in that the cross-section of an upper part of the intake passage (33,34) defined by the rectifier plate portion (59) is decreasing toward the opening of the intake passage (33,34) to the combustion chamber.
Claim 12
Dependent Claim
49 words
Induction system as claimed in at least one of the preceding claims 1-11, characterised in that the valve cut-out (56) is configured such that the cut-out (56) forms a smooth continuous extension of the associated intake passage (33,34) when the control valve (54) is in its fully opened position.
Claim 13
Dependent Claim
89 words
Induction system as claimed in at least one of the preceding claims 1-12, characterised in that the control valve (54) comprises a substantially cylindrical configuration having the valve cut-out (56) for assuring a smooth flow of intake charge through the controlled intake passage (33,34), said control valve (54) when switched in its closed position abutting against the upstream edge of the rectifier plate portion (59) of the rectifier plate (57) diverts the flow to an upper flow area of the intake passage (33,34) defined by the rectifier plate (57).
Claim 14
Dependent Claim
44 words
Induction system as claimed in at least one of the preceding claims 1-13, characterised in that the control valve (54) provides a substantially continuous surface area with the cylinder head, specifically the air surface of the intake passage (33,34) in each of its positions.
Claim 15
Dependent Claim
45 words
Induction system as claimed in claim 14, characterised in that a substantially continuous smooth flow surface is provided between the control valve surface, specifically surface of the valve cut-out (56) and the rectifier plate portion (59) when said control valve (54) assumes its closed position.
Claim 16
Dependent Claim
89 words
Induction system as claimed in at least one of the preceding claims 1-15, characterised in that the intake passage is of the Siamese type providing primary and secondary intake passages (33,34) for each cylinder, and that a throttle valve assembly (207) is journaled in a cylinder head and supporting a valve plate (209) which, in its closed position, substantially precludes flow through the second intake passage (34), directing all of the flow through the primary intake passage (33) in which the control valve and the rectifier plate are arranged.
Claim 17
Dependent Claim
95 words
Induction system as claimed in claim 16, characterised in that the engine has three stages of different intake flow beyond the full range of engine speed, wherein the first stage is acquired when the valve plate (209) assumes its closed position and the control valve assumes also its closed position, whereas the second stage is obtained when the valve plate (209) assumes its closed position and the control valve assumes its open position, while the third stage is adjusted when all valves including the valve plate (209) and the control valve assume its open position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.