EP0068481A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A flow control device of a helically-shaped intake port
Assignee: Toyota Motor Corp
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Filing: 1982-06-28
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Granted: —
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Expires: 2002-06-28
Abstract
Abstract A helically-shaped intake port (6) comprising a helical portion formed around an intake valve and a substantially straight inlet passage portion tangentially connected to the helical portion. A by-pass passage (14) is branched off from the inlet passage portion and connected to the helical portion. A rotary valve (18) is arranged in the by-pass passage (14) and actuated by a vacuum operated diaphragm apparatus. The rotary valve (18) is opened when the amount of air fed into the cylinder of an engine is increased beyond a predetermined value. A cooling water passage is arranged beneath and near the by-pass passage.
Inventors
- 👤 Shinichi Kato
- 👤 Yoshihiko Dohi
- 👤 Katsuhiko Motosugi
- 👤 Ituo Koga
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 05:59
CPC Classifications
F; F01; F01P; F01P3/00; F01P3/02; F02; F02B; F02B31/00; F02B31/04; F02B31/042; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4228; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
152 words
l. A device for controlling the flow in a helically--shaped intake port of an internal combustion engine, said intake port comprising a helical portion formed around an intake valve and a substantially straight inlet passage portion tangentially connected to the helical portion and having a helix terminating portion, said device comprising: a bypass passage branched off from the inlet passage portion and connected to the helix terminating portion of the helical portion, said bypass passage having a bottom wall; a normally closed rotary valve arranged across said bypass passage for controlling the flow area of said bypass passage; a cooling water passage arranged beneath and near the bottom wall of said bypass passage; and actuating means for actuating said rotary valve in response to the change in the amount of air fed into the intake port to open said rotary valve when said amount of air is increased beyond a predetermined value.
Claim 2
Dependent Claim
39 words
A device according to claim 1, wherein a recess is formed on the bottom wall of said bypass passage for receiving a lower end of said rotary valve, said cooling water passage being arranged beneath and near said recess.
Claim 3
Dependent Claim
23 words
A device according to claim 2, wherein the lower end of said rotary valve is spaced from a bottom wall of said recess.
Claim 4
Dependent Claim
28 words
A device according to claim 1, wherein said engine has a cylinder head having a cylindrical bore formed therein, said rotary valve being arranged in said cylindrical bore.
Claim 5
Dependent Claim
21 words
A device according to claim 4, wherein said cylindrical bore extends across said bypass passage and has a substantially uniform cross-section.
Claim 6
Dependent Claim
44 words
A device according to claim 4, wherein said rotary valve comprises a valve holder fixed onto the cylinder, a valve shaft rotatably supported by said valve holder and a thin plate-shaped valve body fixed onto said valve shaft and extending across said bypass passage.
Claim 7
Dependent Claim
19 words
A device according to claim 6, wherein said valve body is formed in one piece on said valve shaft.
Claim 8
Dependent Claim
17 words
A device according to claim 6, wherein said valve body and said valve shaft are separately formed.
Claim 9
Dependent Claim
20 words
A device according to claim 6, wherein a seal member is inserted between said valve holder and the cylinder head.
Claim 10
Dependent Claim
20 words
A device according to claim 6, wherein a seal member is inserted between said valve shaft and said valve holder.
Claim 11
Dependent Claim
45 words
A device according to claim 1, wherein the intake passage portion has an inlet open end located furthest from the helical portion, said bypass passage having an inlet opening which is open to the inlet passage portion at a position near said inlet open end.
Claim 12
Dependent Claim
76 words
A device according to claim 11, wherein the intake passage portion comprises an upper wall, a bottom wall, a first side wall located near the intake valve and a second side wall located remote from the intake valve, said first side wall comprising a downwardly inclined portion located near the helical portion, and a substantially vertical portion located near said inlet open end, the inlet opening of said bypass passage being formed on said vertical portion.
Claim 13
Dependent Claim
47 words
A device according to claim 12, wherein the intake port comprises a valve guide projecting into the helical portion from an upper wall of the helical portion and having a circumferential wall, said downwardly inclined portion being tangentially connected to the circumferential wall of said valve guide.
Claim 14
Dependent Claim
32 words
A device according to claim 1, wherein said bypass passage has an outlet opening which is open to the helical portion at a position near a top wall of the helical portion.
Claim 15
Dependent Claim
40 words
A device according to claim 14, wherein the top wall of the helical portion has a steeply inclined wall portion at the helix terminating portion, the outlet opening of said bypass passage being arranged near said steeply inclined wall portion.
Claim 16
Dependent Claim
99 words
A device according to claim 1, wherein said actuating means comprises a vacuum chamber, a diaphragm connected to said rotary valve and actuated in response to a change in the level of the vacuum in said vacuum chamber, and a control apparatus maintaining the level of the vacuum in said vacuum chamber at the maximum vacuum which has been produced in the intake port when the amount of air fed into the intake port is smaller than said predetermined value and connecting said vacuum chamber to the atmosphere when said amount of air is larger than said predetermined value.
Claim 17
Dependent Claim
69 words
A device according to claim 16, wherein said control apparatus comprises a check valve arranged between the intake port and said vacuum chamber for allowing only the outflow of air from said vacuum chamber, and a control valve for controlling the fluid connection between said vacuum chamber and the atmosphere to connect said vacuum chamber to the atmosphere when said amount of air is larger than said predetermined value.
Claim 18
Dependent Claim
43 words
A device according to claim 17, wherein the engine comprises a carburetor connected to the intake port and having a venturi portion, said control valve being actuated in response to a change in the level of the vacuum produced in said venturi portion.
Claim 19
Dependent Claim
60 words
A device according to claim 18, wherein said control valve comprises a valve body for controlling the fluid connection between said vacuum chamber and the atmosphere, a vacuum cavity connected to said venturi portion, and a diaphragm connected to said valve body and actuated in response to a change in the level of the vacuum produced in said vacuum cavity.
References Cited (Backward Citations)
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