US4171686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburation devices with idle adjustment
Assignee: Societe Industrielle de Brevets et dEtudes SIBE
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Filing: 1977-07-25
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Granted: 1979-10-23
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Expires: 1997-07-25
Abstract
Abstract A carburetor for an internal combustion engine comprises a fuel idling circuit opening into the intake pipe downstream of a driver-actuated main throttle. Idle regulation means comprise a first pneumatic element connected to that part of the intake pipe downstream of the main throttle and a second pneumatic element having a movable part connected to the main throttle means by a unidirectional connection such that the throttle means can be opened to an additional extent. The second pneumatic element is subjected to the vacuum in a chamber connected to said part of the intake pipe and also connected to atmosphere by a valve carried by the movable part of the second element and opened by the first pneumatic element moving with respect to the second pneumatic element when there is an increase in the degree of vacuum in the intake pipe. Additional means preventing the main throttle from closing beyond a partially open position and which are disabled after successful cranking may be provided.
Inventors
- 👤 Jacques Chenet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:09
CPC Classifications
F; F02; F02D; F02D11/00; F02D11/06; F02D11/08; F02M; F02M3/00; F02M3/06; F02M3/062; Y; Y10; Y10S; Y10S261/00; Y10S261/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
293 words
A carburation device for internal combustion engine comprising: an intake pipe, an operator operable main throttle member in said intake pipe, stop means for preventing said throttle member from closing beyond a predetermined minimum opening position by which an air flow cross-section is defined by the throttle member in the intake pipe, an idling circuit constructed to receive fuel and air and terminating into a part of said intake pipe downstream of said throttle member, and idling regulator means which includes: a first pneumatic element having movable wall means, means for connecting said element to said part of the intake pipe so that the position of the movable wall means is determined by the degree of underpressure in said part of the intake pipe, a second pneumatic element having force applying wall means drivably connected to said main throttle member via a one-way connection to move said throttle member in the direction of opening, and valve means carried by the force applying drive wall means arranged to be engaged and actuated by the wall means of said first pneumatic element upon movement of said wall means of said first pneumatic element toward said force applying wall means responsive to increase of said degree of underpressure, said valve means upon actuation thereof modifying the underpressure applied to said force applying wall means whereby the latter is moved in the direction corresponding to a decrease in the minimum degree of opening of said throttle, and further comprising, operatively associated with the idling regulator means, subsidiary means for preventing the main throttle member from closing beyond a predetermined partially open position, said subsidiary means being disabled in operation upon an increase of the underpressure which prevails downstream of the main throttle member beyond a predetermined threshold.
Claim 2
Dependent Claim
293 words
A carburation device for internal combustion engine comprising: an intake pipe, an operator operable main throttle member in said intake pipe, stop means for preventing said throttle member from closing beyond a predetermined minimum opening position by which an air flow cross-section is defined by the throttle member in the intake pipe, an idling circuit constructed to receive fuel and air and terminating into a part of said intake pipe downstream of said throttle member, and idling regulator means which includes: a first pneumatic element having movable wall means, means for connecting said element to said part of the intake pipe so that the position of the movable wall means is determined by the degree of underpressure in said part of the intake pipe, a second pneumatic element having force applying wall means drivably connected to said main throttle member via a one-way connection to move said throttle member in the direction of opening, and valve means carried by the force applying drive wall means arranged to be engaged and actuated by the wall means of said first pneumatic element upon movement of said wall means of said first pneumatic element toward said force applying wall means responsive to increase of said degree of underpressure, said valve means upon actuation thereof modifying the underpressure applied to said force applying wall means whereby the latter is moved in the direction corresponding to a decrease in the minimum degree of opening of said throttle, and further comprising, operatively associated with the idling regulator means, subsidiary means for preventing the main throttle member from closing beyond a predetermined partially open position, said subsidiary means being disabled in operation upon an increase of the underpressure which prevails downstream of the main throttle member beyond a predetermined threshold.
Claim 3
Dependent Claim
150 words
A carburation device according to claim 1, wherein the second pneumatic element is provided with resilient return means which return at rest the moving part of said second pneumatic element to a position preventing the main throttle member from closing beyond said determined partially open position, said resilient means exerting a force which opposes the action of the underpressure which prevails in the chamber, connected to said part of the inlet duct and to the atmosphere by a valve carried by said moving part and moved to the open position by the relative movement of the first pneumatic element and the second pneumatic element, the valve being normally closed and opening by abutment against a member controlled by the first pneumatic element after said moving part has travelled from its rest position over a distance which is longer the higher the depression to which the first pneumatic element is subjected.
Claim 4
Dependent Claim
55 words
A carburation device according to claim 1, having temperature responsive means arranged for attenuating the underpressure which is exerted on the first pneumatic element, in relation to that which prevails in the part of the inlet duct located downstream of the main throttle member, as long as the engine has not reached the predetermined temperature.
Claim 5
Dependent Claim
51 words
A carburation device according to claim 1, including a thermostatic means comprising a strip or a capsule provided with a member for closing off a hole provided in the wall of a chamber occupied by the first pneumatic element, said member closing the hole when the temperature of the engine increases.
Claim 6
Dependent Claim
35 words
A carburation device according to claim 1, wherein the first pneumatic element is an aneroid capsule placed in a chamber connected to the part of the inlet duct located downstream of the main throttle member.
Claim 7
Dependent Claim
84 words
A carburation device according to claim 1, wherein the subsidiary means comprise a stop cooperating with the main throttle member, movable between a rest position, in which it lets the main throttle member return to a position of minimum opening, and an active position, in which it prevents said main throttle member from closing beyond the predetermined partially open position, and means for maintaining said stop in its active position during cranking of the engine and until the underpressure is greater than the threshold.
Claim 8
Dependent Claim
76 words
A carburation device according to claim 6, wherein the stop is formed by a movable element of an electromagnet whose electric energizing circuit comprises, in series relation, a current source; a switch which closes at the same time as an ignition switch of the engine, and a pneumatically controlled contactor connected to the part of the inlet duct located downstream of the main throttle member and arranged to open when the underpressure therein exceeds the threshold.
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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) | 1982-10-22 | 1983-04-23 | 1983-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-22 | 1987-04-23 | 1987-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-22 | 1991-04-23 | 1991-10-23 | $7700.00 | Window Closed / Lapsed |