GB2131918A

GB2131918A - Induction system for an internal- combustion engine

Info

Publication number: GB2131918A
Application number: GB08329743A
Authority: GB
Inventors: Jurgen Henke; Gunther Vogler
Original assignee: Daimler Benz AG
Current assignee: Daimler Benz AG
Priority date: 1982-11-27
Filing date: 1983-11-08
Publication date: 1984-06-27
Also published as: FR2536790A1; GB2131918B; SE450512B; FR2536790B1; GB8329743D0; SE8305974D0; IT8349283A0; DE3243996C1; SE8305974L; IT1170571B

Abstract

A throttle element 2 which controls the rate of flow of the induction air is disposed in the induction system 1 for an internal-combustion engine, particularly for an internal-combustion engine which is in new condition. To reduce an amount of leakage induction air, the rate of flow of the said air when the throttle element is in the closed position is reduced to a value approaching zero by means of a material 3 for example a polymer material, which is sprayed into the induction system upstream of the throttle element within vacuum applied downstream of the throttle element. <IMAGE>

Description

SPECIFICATION Induction system for an internal-combustion engine This invention relates to an induction system for an internal-combustion engine, particularly an engine in a new condition, in which is disposed a throttle element which controls the th rough-flow of induction air.From many publications, for example German Offenlegungsschrift 1,916,639, internal-combustion enginesare known in which a throttle element in the form of athrottle valve is disposed inthe induction pipe of the system, the rate of flow of the induced air being regulated bythe said throttle element. Inthese arrangements, when the throttle valve is in the closed position, a leakage opening cross-section is formed between the outer circumference of the valve and the inner circumference of the induction pipe, through which cross-section a relatively large amount of leakage airflows. Leakage cross-sections are caused during production and result from play and tolerances. The amount of such leakage air is taken into account when the basic setting ofthe internalcombustion engine is established.As a result, this basic setting is influenced, in a somewhat negative manner, as the engine becomes increasingly contaminated in the region of the throttle valve because of the decreasing amount of leakage induction air.

The present invention seeks to provide an induction system of the aforesaid kind but with a considerabiy reduced amount of leakage induction air.

To this end, according to the invention, in an induction system for an internal combustion engine, particularly an engine in a new condition, there is disposed a throttle element which regulates the flow of the induction air and in which aflexibleoryieldable material is provided in the region of the throttle element, by which material the rate of flow of the induction air when the throttle element is in the closed position is reducible to an amount approaching zero, which material is introduced into the said system upstream of the throttle element by spraying whilst a vacuum is applied inside the said system downstream of the said element.

Otherfeatures ofthe invention are setforth in subordinate claims.

A precondition for functionally suitable setting and adjustment of an internal-combustion engine during idling can be created in a simple and inexpensive manner bythe application, in accordance with the invention, of a polymer coating inside the induction system ofthe engine. Particularly in the case of new internal-combustion engine and in such engines which have a clean induction pipe in the region of the throttle element, the influence ofthe leakage-opening cross-section on the idle-running setting ofthe engine as a result of changes in the course of engine running time is considerably reduced by reducing that crosssection itself.The reduction ofthiscross-section also offers the possibility, with respect to the idle setting of the engine, of compensating for absolute change still possible in the amount of leakage induction air resulting from the existing control stroke of the throttle element, which is dependent upon technical considerations of design and adjustment.

One embodiment of the invention,bywayof example is shown in the accompanymydEving in which: Figure lisa longitudinal sectionthn:ughathrottl-e housing pipe-connection intheregionofathrottle valve, and Figure 2 is an enlarged view of a detail in Figure 1.

The drawing shows a throttle-housing connection ii, of an induction system of an internal-combustion engine, in which is disposed a throttle elementfor regulating the rate of flow of the induction air. The throttle element is in the form of a rotatable flap valve 2 which can be actuated at will. However, it could be replaced by any otherform of throttle element.When the valve 2 is in the closed position shown, the rate of flow of the induction air can be reduced to an amount approaching zero by means of material 3, suitably a flexible oryieldable polymer material, introduced into the housing 1 in the region of the valve 2.The material 3 has, upstream ofthevalve 2, an elevation 6which extends around the outer peripheral area ofthe valve 2 and adheres for example, to the interior circumference 5 of the housing 1. For example, the material 3 may be introduced into the housing 1 by being sprayed upstream of the valve 2 with simultaneous application of vacuum downstream of the said valve. Advantageously, this vacuum may be the vacuum already present in the case of a running engine. Suitable material may be an antifriction lacquer loaded with molybdenum disulphide.However it could be any other material with will firm a sealing, paste-like body or mass which possesses lubricant property and will adhere to structural parts, particularly the interior surface of the part 1.

1. An induction system, for an internal-combustion engine, in which is disposed a throttle element which regulates the rate offlowofthe induction air and in which a body offlexible oryieldable material is provided in the region ofthethrottle element, by which system the rate of flow ofthe induction air when the throttle element is in the closed position is reducible to an amount approaching zero, which material is introduced into the said system upstream ofthethrottle element by spraying whilst a vacuum is applied inside the said system downstream of the said element.

2. An induction system as claimed in Claim 1, wherein the said material has been introduced into the induction systemwhilethe engine is running.

3. An induction system as claimed in Claim 1 or2, wherein the throttle element is a valve rotatably disposed in a throttle housing, in which the said material is applied to the inner circumference of the said housing.

4. An induction system according to any of Claims 1 to 3, wherein the said material has upstream of the throttle valve a projection which extends round the outer circumferential region of the latter.

5. An induction system as claimed in any one of claims 1 to 4, wherein the said material is an antifriction lacqerfilled with molybdenum disulphide.

6. An induction system substantially as hereinbefore described with reference to the accompanying drawing.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Induction system for an internal-combustion engine This invention relates to an induction system for an internal-combustion engine, particularly an engine in a new condition, in which is disposed a throttle element which controls the th rough-flow of induction air.From many publications, for example German Offenlegungsschrift 1,916,639, internal-combustion enginesare known in which a throttle element in the form of athrottle valve is disposed inthe induction pipe of the system, the rate of flow of the induced air being regulated bythe said throttle element. Inthese arrangements, when the throttle valve is in the closed position, a leakage opening cross-section is formed between the outer circumference of the valve and the inner circumference of the induction pipe, through which cross-section a relatively large amount of leakage airflows. Leakage cross-sections are caused during production and result from play and tolerances. The amount of such leakage air is taken into account when the basic setting ofthe internalcombustion engine is established.As a result, this basic setting is influenced, in a somewhat negative manner, as the engine becomes increasingly contaminated in the region of the throttle valve because of the decreasing amount of leakage induction air. The present invention seeks to provide an induction system of the aforesaid kind but with a considerabiy reduced amount of leakage induction air. To this end, according to the invention, in an induction system for an internal combustion engine, particularly an engine in a new condition, there is disposed a throttle element which regulates the flow of the induction air and in which aflexibleoryieldable material is provided in the region of the throttle element, by which material the rate of flow of the induction air when the throttle element is in the closed position is reducible to an amount approaching zero, which material is introduced into the said system upstream of the throttle element by spraying whilst a vacuum is applied inside the said system downstream of the said element. Otherfeatures ofthe invention are setforth in subordinate claims. A precondition for functionally suitable setting and adjustment of an internal-combustion engine during idling can be created in a simple and inexpensive manner bythe application, in accordance with the invention, of a polymer coating inside the induction system ofthe engine. Particularly in the case of new internal-combustion engine and in such engines which have a clean induction pipe in the region of the throttle element, the influence ofthe leakage-opening cross-section on the idle-running setting ofthe engine as a result of changes in the course of engine running time is considerably reduced by reducing that crosssection itself.The reduction ofthiscross-section also offers the possibility, with respect to the idle setting of the engine, of compensating for absolute change still possible in the amount of leakage induction air resulting from the existing control stroke of the throttle element, which is dependent upon technical considerations of design and adjustment. One embodiment of the invention,bywayof example is shown in the accompanymydEving in which: Figure lisa longitudinal sectionthn:ughathrottl-e housing pipe-connection intheregionofathrottle valve, and Figure 2 is an enlarged view of a detail in Figure 1. The drawing shows a throttle-housing connection ii, of an induction system of an internal-combustion engine, in which is disposed a throttle elementfor regulating the rate of flow of the induction air. The throttle element is in the form of a rotatable flap valve 2 which can be actuated at will. However, it could be replaced by any otherform of throttle element.When the valve 2 is in the closed position shown, the rate of flow of the induction air can be reduced to an amount approaching zero by means of material 3, suitably a flexible oryieldable polymer material, introduced into the housing 1 in the region of the valve 2.The material 3 has, upstream ofthevalve 2, an elevation 6which extends around the outer peripheral area ofthe valve 2 and adheres for example, to the interior circumference 5 of the housing 1. For example, the material 3 may be introduced into the housing 1 by being sprayed upstream of the valve 2 with simultaneous application of vacuum downstream of the said valve. Advantageously, this vacuum may be the vacuum already present in the case of a running engine. Suitable material may be an antifriction lacquer loaded with molybdenum disulphide.However it could be any other material with will firm a sealing, paste-like body or mass which possesses lubricant property and will adhere to structural parts, particularly the interior surface of the part 1. CLAIMS