US4481915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helically-shaped intake port of an internal combustion engine
Assignee: Toyota Motor Corp
•
Filing: 1983-05-02
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Granted: 1984-11-13
•
Expires: 2003-05-02
Abstract
Abstract An engine comprising an intake port which has a separating wall projecting downwardly from the upper wall of the intake port. The separating wall defines a helical portion, an inlet passage portion tangentially connected to the helical portion, and a bypass passage interconnecting the inlet passage portion to the helical portion. A rotary valve is arranged in the bypass passage and actuated by a vacuum operated diaphragm apparatus. The rotary valve is opened when the amount of air fed into the cylinder of an engine is increased beyond a predetermined value. A downwardly projecting rib is formed on the bottom face of the separating wall. The rib extends toward the helical portion from the rotary valve.
Inventors
- 👤 Kiyoshi Nakanishi
- 👤 Takeshi Okumura
- 👤 Mutsumi Kanda
- 👤 Takeshi Kotani
- 👤 Tokuta Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:17
CPC Classifications
F; F02; F02B; F02B31/00; F02B31/04; F02B31/042; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
336 words
An intake device of an internal combustion engine comprising: an intake valve having a valve stem; an axially extending intake port passage having an inlet opening at one end thereof and having an outlet opening at the other end thereof, said intake port passage having a substantially cylindrically extending circumferential wall which circumferentially extends about said valve stem, a first side wall which extends between said inlet opening and said circumferential wall along an axis of said intake port passage, a second side wall which extends between said inlet opening and said circumferential wall along the axis of said intake port passage and is arranged to face said first side wall, an upper wall which extends between said inlet opening and said circumferential wall along the axis of said intake port passage, and a bottom wall which extends between said inlet opening and said circumferential wall along the axis of said intake port passage; a separating wall projecting downward from said upper wall and spaced from said bottom wall, said separating wall extending along the axis of said intake port passage and being spaced from said circumferential wall for defining a helical portion having a helix terminating portion between said separating wall and said circumferential wall, said separating wall being spaced from said first side wall for defining therebetween an inlet passage portion tangentially connected to said helical portion, said separating wall being spaced from said second side wall for defining therebetween a bypass passage which interconnecting said inlet passage portion to said helix terminating portion; a normally closed valve means arranged in said bypass passage for controlling the flow area of said bypass passage; an actuating means for actuating said valve means in response to the change in the operating condition of the engine to open said valve means when the engine is operating at a high speed under a heavy load; and a rib projecting downward from a bottom face of said separating wall and extending toward said helical portion from said valve means.
Claim 2
Dependent Claim
336 words
An intake device of an internal combustion engine comprising: an intake valve having a valve stem; an axially extending intake port passage having an inlet opening at one end thereof and having an outlet opening at the other end thereof, said intake port passage having a substantially cylindrically extending circumferential wall which circumferentially extends about said valve stem, a first side wall which extends between said inlet opening and said circumferential wall along an axis of said intake port passage, a second side wall which extends between said inlet opening and said circumferential wall along the axis of said intake port passage and is arranged to face said first side wall, an upper wall which extends between said inlet opening and said circumferential wall along the axis of said intake port passage, and a bottom wall which extends between said inlet opening and said circumferential wall along the axis of said intake port passage; a separating wall projecting downward from said upper wall and spaced from said bottom wall, said separating wall extending along the axis of said intake port passage and being spaced from said circumferential wall for defining a helical portion having a helix terminating portion between said separating wall and said circumferential wall, said separating wall being spaced from said first side wall for defining therebetween an inlet passage portion tangentially connected to said helical portion, said separating wall being spaced from said second side wall for defining therebetween a bypass passage which interconnecting said inlet passage portion to said helix terminating portion; a normally closed valve means arranged in said bypass passage for controlling the flow area of said bypass passage; an actuating means for actuating said valve means in response to the change in the operating condition of the engine to open said valve means when the engine is operating at a high speed under a heavy load; and a rib projecting downward from a bottom face of said separating wall and extending toward said helical portion from said valve means.
Claim 3
Dependent Claim
28 words
An intake device according to claim 1, wherein said rib extends toward said helical portion from a position which is located downstream of and near said valve means.
Claim 4
Dependent Claim
25 words
An intake device according to claim 1, wherein said rib has a contour shape which is similar to the cross-sectional shape of said separating wall.
Claim 5
Dependent Claim
48 words
An intake device according to claim 1, wherein said rib has a tip portion which is located nearest said inlet opening, the distance between said tip portion and said valve means, which is measured perpendicular to the axis of said intake port passage, being smaller than 1 mm.
Claim 6
Dependent Claim
49 words
An intake device according to claim 1, wherein the bottom face of said separating wall is spaced from the bottom wall of said intake port passage and gradually leaves the upper wall of said intake port passage as the bottom face of said separating wall approaches said helical portion.
Claim 7
Dependent Claim
47 words
An intake device according to claim 5, wherein said rib has a bottom face spaced from the bottom wall of said intake port passage and gradually leaving from the upper wall of said intake port passage as the bottom face of said rib approaches said helical portion.
Claim 8
Dependent Claim
23 words
An intake device according to claim 1, wherein said separating wall has a transverse width which is gradually increased towards said helical portion.
Claim 9
Dependent Claim
26 words
An intake device according to claim 1, wherein said separating wall extends to a position near said circumferential wall for defining a narrow passage portion therebetween.
Claim 10
Dependent Claim
37 words
An intake device according to claim 8, wherein said upper wall, located between said separating wall and said circumferential wall, has a width which is gradually increased from said narrow passage portion toward said helix terminating portion.
Claim 11
Dependent Claim
24 words
An intake device according to claim 1, wherein said separating wall has an inclined side wall defining said inlet passage portion and directed downward.
Claim 12
Dependent Claim
40 words
An intake device according to claim 1, wherein said separating wall has a substantially vertical side wall defining said bypass passage, said second side wall being substantially vertically arranged so that said bypass passage has a substantially uniform transverse width.
Claim 13
Dependent Claim
32 words
An intake device according to claim 1, wherein said upper wall, located between said separating wall and said first side wall, has a width which is gradually reduced toward said helical portion.
Claim 14
Dependent Claim
15 words
An intake device according to claim 1, wherein said first side-wall is substantially vertically arranged.
Claim 15
Dependent Claim
36 words
An intake device according to claim 1, wherein said bottom wall has an inclined portion located adjacent to said first side wall, the inclined angle of said inclined portion being gradually increased toward said helical portion.
Claim 16
Dependent Claim
32 words
An intake device according to claim 1, wherein said bypass passage has an inlet portion which is open to said inlet passage portion, said valve means being arranged in said inlet portion.
Claim 17
Dependent Claim
21 words
An intake device according to claim 1, wherein said valve means comprises a rotary valve rotatably arranged in said bypass passage.
Claim 18
Dependent Claim
26 words
An intake device according to claim 16, wherein said rotary valve has a thin plate-shaped valve body extending between said upper wall and said bottom wall.
Claim 19
Dependent Claim
26 words
An intake device according to claim 17, wherein said valve body has a width which is substantially equal to the transverse width of said bypass passage.
Claim 20
Dependent Claim
44 words
An intake device according to claim 1, wherein said actuating means actuates said valve means in response to the amount of air fed into said intake port passage and opens said valve means when said amount of air is increased beyond a predetermined value.
Claim 21
Dependent Claim
102 words
An intake device according to claim 19, 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 passage when the amount of air fed into the intake port passage 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 22
Dependent Claim
71 words
An intake device according to claim 20, wherein said control apparatus comprises a check valve arranged between the intake port passage 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 23
Dependent Claim
45 words
An intake device according to claim 21, wherein the engine comprises a carburetor connected to the intake port passage 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 24
Dependent Claim
60 words
An intake device according to claim 22, wherein said control valve comprises a valve body for controlling 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.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |