EP1283340B1 - Throttle apparatus housing with flexible compensating elements for internal combustion engines - Google Patents

Description

Technical area

In internal combustion engines used in vehicles today, a throttle device is used, which is usually designed as a circular flap, is included in the intake manifold of the internal combustion engine and dosed to suck the required for the combustion volume flow of fresh air. Due to the high flow rates of the residual air flow in the intake tract and at low ambient temperatures, the H ₂ O contained in the fresh air can condense on the wall of the tube; Upon further cooling ice may form inside the fresh air line, which can significantly affect the ease with which a throttle valve. Furthermore, care must be taken in the case of split throttle plate housings that no external air can enter the intake tract behind the throttle valve on the side facing the internal combustion engine in the region of the parting lines of the housing halves.

State of the art

DE 19936457 describes a throttle device according to the preamble of claim 1.

DE 33 46 167 A1 relates to a throttle body. At a throttle body According to this solution, a throttle valve is arranged on a shaft which in turn can be fixed on both sides in the nozzle housing by plain bearings. These plain bearings are each pressed into a shaft bore and have throttle side End faces, which are curved according to the wall of the housing bore and form part of this wall. This design of the sliding bearing is the leakage rate This throttle body according to DE 33 46 167 A1 extremely low.

DE 198 43 771 A1 relates to an electromotive actuator, in particular with a throttle valve. An electromotive actuator is disclosed with a housing and an electric motor disposed on a drive side within the housing for driving a movable element arranged in the housing. In this movable element is in particular a throttle valve, wherein provided is that on the housing a separate electronics housing for receiving a control and / or Evaluation electronics can be fastened. This can be especially the one hand Avoid electromagnetic interference and on the other hand can be standard manufactured and no control unit requiring electronic actuators used be without any changes to the mold to make the actuator required are.

From DE 29 49 041 B1 a heater for mixture preparation in mixture formers is known. According to this solution, it is a heater for mixture preparation Internal combustion engine mixture formers with a main flow limiting tube wall and with a main throttle member downstream and a fuel metering device in the upstream part of a mixing chamber. This is about a part of this Longitudinal extension as a heat exchanger double wall with an annular Heizwasserraum formed, at its one end a water inlet pipe and on has a water outlet at the other end. The heat exchanger is over thermally controlled, opening from higher temperatures Zuschaltventil with a Cooling water circuit connectable. It is located at blocked connection valve as well as at switched off cooling water circuit above the cooling water level. The Andes Main flow path of the Gemischbildners adjacent inner wall of the heat exchanger consists of an electrical resistance material and is dependent on one from the cooling water temperature thermally controlled, from a certain higher water temperature opening electrical switching element electrically connected to a voltage source.

From DE 101 14 221.8-13 is a heated throttle device for internal combustion engines known. In this case, a fluid flow flows through a flow cross-section of a bore, wherein the fluid flow by means of an actuatable, in a receiving bore in the housing pivotable throttle element is metered. Between a wall of the hole and the outer circumference of the housing are in this cavities for a heating or cooling medium educated.

Advantages of the invention

The advantages of the solution proposed according to the invention are, above all, to be seen in that now with a single insert element between the housing halves of a Throttle housing, which is composed of an upper shell and a lower shell, both a seal of the housing element is given against external air intake while on the other hand by the insert element a compensation of tolerances on the dividing joint the two housing halves, designed for example as an aluminum injection molded component Throttle housing, takes place. This allows reworking operations to be carried out in the Usually be done by way of cutting, when assembling the housing halves of the throttle body. With the in the division of the two Housing halves integrated insert element can also be in the throttle body Seal integrated heater. For example, in the walls the throttle body halves integrated cavities, that of a heating medium be flowed through, the insert element can make their seal effective. In addition, the insert element diameter differences in the flow cross-section equalize the throttle body halves so that there are no jumps in diameter occur and therefore no dead water areas arise in which in the intake air accumulate contained media over the operating time of the internal combustion engine.

The insert element can on the one hand be designed as a prefabricated molded part a conical inner wall; On the other hand, it can also be cured by a hardening Material form, so that the two throttle body halves after assembly are fixed for later use. Both the design of the sealing element as a prefabricated preformed elastomer ring as well as the design of the sealing element Made of a formable after processing hardening material allows the compensation of manufacturing inaccuracies on the successive faces of the upper or lower throttle body halves. A balance of production inaccuracies, i.e., e.g. Out-of-roundness and run-out deviations, so far only by a mostly on the Zerspanungswege consuming and expensive post-processing of each other To be joined throttle halves possible.

By designed as elastomer insert or as a hardening molding compound sealing element can by a corresponding shaping of the flow cross-section facing Wall of the sealing element, in particular via an integrally formed angled Outlet, in the flow direction better flow guidance of the intake air flow in the suction line can be achieved in the intake tract of an internal combustion engine.

drawing

With reference to the drawing, the invention will be described below in more detail.

Figur 1

eine perspektivische Draufsicht auf ein Drosselklappengehäuse mit integrierten Strömungskanälen für ein Temperiermedium,

Fig. 1.1

eine teilweise in vergrößertem Maßstab wiedergegebene aufgeschnittene Darstellung der Strömungskanäle für das Temperiermedium,

Fig. 2

die Draufsicht auf eine Drosselvorrichtung,

Fig. 2.1

einen Schnitt durch die Drosselvorrichtung gemäß des Schnittverlaufes B-B in Fig. 2,

Fig. 2.2

einen Schnittverlauf A-A durch die Drosselvorrichtung gemäß Fig. 2,

Fig. 3

einen Schnitt durch das Dichtelement und

Fig. 3.1

eine perspektivische Draufsicht auf das Dichtelement gemäß der Darstellung in Fig. 3.

It shows:

FIG. 1

a perspective top view of a throttle body with integrated flow channels for a tempering,

Fig. 1.1

a partially enlarged representation of a cutaway view of the flow channels for the temperature control,

Fig. 2

the top view of a throttle device,

Fig. 2.1

a section through the throttle device according to the sectional profile BB in Fig. 2,

Fig. 2.2

a sectional view AA through the throttle device of FIG. 2,

Fig. 3

a section through the sealing element and

Fig. 3.1

a perspective top view of the sealing element as shown in Fig. 3rd

variants

Fig. 1 is a perspective top view of a throttle body with integrated Remove flow channels for a temperature control medium.

A throttle device 1, whose housing is formed in several parts, includes, among others a lower housing half 2. At the lower housing half 2 is a lower shell. 3 molded, which is closed by an upper shell 4, wherein in the lower shell 3 and the upper shell 4 limited cavity drive elements are added. The drive elements are received by one in a drive housing 5 Actuator driven, actuate a not shown in the illustration of FIG. 1 Throttle. The throttle valve or the throttle shaft is in bearings 6 the other half of the housing inserted.

The lower housing half 2 comprises an inner wall 8, which has the flow cross section a fluid flow through the throttle device 1 limited. Extend from the inner wall 8 Rib-shaped configured webs 9 in the direction of the inner wall 8 surrounding outer wall 11 of the lower half of the housing 2. Between the individual rib-shaped configured webs 9 cavities 10 are formed, which for the temperature of the Flow cross-section bounding inner wall 8 of a heating medium, such. tempered Water or tempered air, can be flowed through. At the the cavities 10, over the entire circumference or partial areas of the circumference of the inner wall. 8 may be formed, limiting outer wall 11, an end face is provided, on which the not shown here a throttle valve assembly 37 (see Fig .. 2.1) in the bearing shells 6 of the lower housing half 2 fixing further housing half rests. The outer wall 11 on the lower housing half 2 is raised above the inner wall 8 of the lower housing half 2, so that a support surface 7 for a in Fig. 1 not illustrated sealing and compensation element is formed. The outer wall 11 fixes the Radial position of a sealing and compensating element, which is formed with a thereto sleeve-shaped portion conforms to the inner wall of the lower housing half 2.

Fig. 1.1 shows a partially cutaway view of the flow channels for a tempering medium within the lower half of the throttle body.

Along a dividing joint 13 are the drive component receiving lower shell 3 of the lower housing half and the upper housing 4 receivable thereon at. From the illustration of FIG. 1.1 which are between the inner wall 8 and the outer wall 11 annularly around the inner wall 8 extending cavities 10 removed, each bounded by rib-shaped webs 9. The as support surface 7 for a Here, not shown sealing and compensation element functioning inner wall 8 occurs the sublime protruding outer wall 11 back so that the outer Wall 11 serves as a radial contact surface 14 for a sealing and compensation element. The Contact area, i. the first end face 15 of the lower housing half 2, in which the bearing shells 6 are formed for a throttle valve arrangement, not shown, is in contact with a corresponding contact surface on a not shown here Upper housing parts of the throttle device 1. Corresponding to the first end face 15, is formed on the underside of the lower housing part 2, a second end face 16.

Fig. 2 shows the plan view of a throttle device.

From the view of FIG. 2 shows that the lower housing half 2 of a throttle device 1 drive components receiving here superimposed in the drawing plane shown lower or upper shells 3, 4 comprises. At this molded is a drive housing 5, which at the lower or upper shells 3, 4 opposite Side is closed via a closure element 23. The closure element 23 can be e.g. by means of snap fasteners 24 on the open end side of the drive housing 5 of the Fix lower housing parts 2.

The fluid flow passing through the flow cross-section of the throttle device 1 is determined by means of a throttle valve surface releasing or closing the free flow cross section 21 regulated. A throttle valve shaft 20 is a first wing 21.1 as well a second wing 21.2 of the throttle surface 21 assigned. About in the drive housing 5 received actuator and that of the lower shell 3 and the upper shell. 4 enclosed, not shown here drive components is the throttle shaft 20 on the throttle device 1 and thus the recorded on the throttle shaft 20 first wing 21.1 and 21.2 twisted.

The housing components of the throttle device 1, for example, by plug-in screws 22 be connected to each other, where in the plan view of FIG. 2 the Front side is shown.

Fig. 2.1 shows a section through the throttle device according to the section B-B in Fig. 2.

The representation of FIG. 2.1 is removed that in the throttle device 1 and their lower housing half 2 a throttle valve shaft 20 comprehensive throttle valve assembly 37 is inserted. At the throttle assembly 37, the throttle shaft 20, may e.g. a drive element 35 be injection molded directly, which in assembled state of the throttle device 1 of the lower shell 3 of the housing lower part 2 and this overlapping upper shell 4 may be connected. The throttle shaft In turn, 20 may be enclosed by bearing elements 33, 34 which are in the in Fig. 1 and Fig. 1.1 shown bearing shells 6 for the throttle shaft 20 and in the can be inserted lower housing half 2 and fixed by mounting the upper half of the housing is.

In the assembled state of the throttle device 1 as shown in Fig. 2.1 can at the outside of a further housing part of the throttle device 1 is a positive connection section 32 are provided for fixing an air connection hose. The throttle shaft 20 of the throttle assembly 37 is of shaft seals 33, 34 for Improvement of the smooth running in the bearing shells 6 of the lower housing half 2 enclosed.

A first sealing and compensating element 30 is in the lower housing half 2 of the Throttle device 1 arranged that a extending in the radial direction bearing surface 43, the cavities 10 in the lower housing half 2 seals. The inner wall 46 of the first sealing and compensating element 30 has no conical inlet region 45, whose widest cross-section 42 on the throttle assembly 37th facing away side and whose narrowest cross-section 41 the diameter of the at Throttle valve shaft 20 received throttle flap 21.1 and 21.2 corresponds. Instead of a shown in Fig. 2.1 in the lower housing half 2 can be inserted first Sealing and compensation element 30, which is designed as an elastomeric molding, can this also be made of a deformable and hardenable material, the final Shaping during assembly of the other housing half on the lower half of the housing 2 takes place. Made with either a curable and deformable material or as a separate formed as an elastomeric molding sealing and inserting element 30 can be made of aluminum die-cast throttle body components occurring in the area of the contact surfaces manufacturing inaccuracies compensate without rework, because the compensation of manufacturing inaccuracies by the throttle flap assembly 37 assigning radially extending contact surface 43 is effected.

In addition to the first sealing and compensating element 30 in the lower housing half 2 of Throttle device 1, a 30 corresponding to the first sealing and compensation element be inserted further sealing and compensation element 31. The two sealing and Compensating elements 30, 31, in the sectional view of FIG. 2.1 at the shaft seals Abut 33 and 34 of the throttle shaft 20, seal the lower half of the housing 2 and the other housing half along their end faces, not shown in FIG. 2.1 from. Also on the further sealing and compensating element 31 is characterized by the contour of the Inner wall 46 of the widest cross-section 42 extending from a conical inlet funnel 45 formed.

From Fig. 2.2 is a sectional profile A-A through the throttle device of FIG. 2 shows. On the lower housing half 2, a drive housing 5 is augebildet in which a taken here in sectional view as solid material shown drive. The drive acts on the enclosed by lower shell 3 and upper shell 4 drive components 35, which the throttle shaft 20 of the throttle assembly 37 within the flow cross-section, which is passed by the fluid flow actuate.

The throttle assembly 37, which the throttle shaft 20 and the offset thereon to each other or to each other exactly opposite received first wing 21.1 and the second wing 21.2 may, for example, procure as an insert 37 be which joints 38 with the also in the flow cross section of the Fluid flow fitted first sealing and compensation element 30 and the other Form sealing and compensation element 31. At the intake valve 37 designed as a throttle valve assembly can shoulders 36 formed in the region of the narrowest cross-section be. A training of shoulders 36 procured on the insert 37 as part Throttle valve assembly is not mandatory. By the narrowest cross section, which on the first and the further sealing and compensating element 30, 31st is formed, the flow cross-section of the fluid channel of the throttle device. 1 different throttle valve diameter can be adjusted. Thus, the invention allows Solution the installation of different sized throttle valve assemblies 37th in one and the same housing, wherein in Fig. 2.2 in a sectional view shown Sealing and compensation elements 30 and 31 as reducing the flow cross-section serve. In addition to the function of a Reduzierelementes can be with the Dichtund Compensating elements 30, 31 as shown in Fig. 2.1 of a temperature control perfused cavities 10 in a housing half 2 formed cavities Close 10; next to it serves in the radial direction extending contact surface 43 as a compensation surface to compensate for manufacturing inaccuracies in die-cast aluminum manufactured throttle body components.

The components which act as sealing and compensating elements 30 and 31 in FIG. 2.2 can in addition to their design as separate elastomer insert rings also made of hardenable, formable materials whose final shape when mounting the housing halves the throttling device 1 takes place and in the mounted state, the insert assembly 37 of the throttle element fix and the parting line of the housing half against Seal outside air inlet from the outside.

Fig. 3 shows the section through a sealing and compensation element.

The illustration of FIG. 3 can be removed that as a separate, made of flexible elastomeric material fabricated insert member 30 and 31 a narrowest cross-section 41 and a widest cross-section 42 has. Due to the cross-sectional difference is an inlet funnel, i.e. a conical frusto-conical inlet region 45 is formed, the narrowest Cross-section 41 is provided with an angled spout 40. In the flow direction seen passing the throttle device 1 fluid flow, this is at passage of the narrowest cross-section 41 by the angled outlet 40 arranged there a homogeneous Impacted airfoil. The reproduced in Fig. 3 in sectional view Sealing and compensating element 30 or 31 comprises a radially extending in the radial direction Abutment surface 43 and a molded onto this, with a constant diameter formed sleeve-shaped portion 44. With the sleeve-shaped portion 44 lies the sealing and compensating element 30 and 31 on the inner wall 8 of the throttle device 1 on. A side which closes in the radial direction extending contact surface 43 (See illustration according to Fig. 2.1) cavities 10 for temperature control of the housing of the throttle device 1, while the other side of the radially extending contact surface 43 a compensation function with regard to manufacturing inaccuracies at the compensates with the lower half of the housing 2 to be joined another housing half, without the Machining work on housing components produced by die-casting aluminum required are.

Fig. 3.1 is a perspective plan view of the sealing and compensating element according to the sectional views in Fig. 3 can be seen. Depending on the diameter difference of the narrowest Cross-section 41 and the widest cross section 42, turns on the inner wall 46th a tapered inlet funnel with respect to the narrowest cross-section 41 of the Dichtund Compensation element 30 and 31 a. The inner wall 46 extends substantially smooth, so that from the narrowest cross-section 41 of the sealing and compensation element 30th or 31 exiting fluid flow through the angled outlet 40 a over the cross section homogeneous flow profile can be impressed, in which turbulence and adjusting dead water areas are avoided. By choosing the closest Cross-section 41 may be the proposed one, both as a discrete elastomeric molded part as well as made of hardenable deformable material sealing and compensation element 30 and 31 are also used as a reducer, so that in an example as a standard housing type of a throttle device 1 serving a component Throttle valve assembly 37 can be installed, the throttle body diameter less than the free flow cross section. By the first and the further sealing and compensating element 30, 31 trained inlet funnel 45 can be the flow in the region of the narrowest cross section, i. where, as the insert 37th obtained throttle device in the free flow cross-section of the throttle device 1, accelerate.

LIST OF REFERENCE NUMBERS

1

throttling device

2

lower half of the housing

3

subshell

4

Upper shell

5

drive housing

6

Bearing shell throttle assembly

7

Support surface sealing and compensation element

8th

inner wall

9

web

10

cavity

11

outer wall

12

peripheral surface

13

Abteilungsfuge

14

radial contact surface

15

first end face

16

second end face

20

throttle shaft

21

butterfly area

21.1

first wing

21.2

second wing

22

locking screws

23

closure element

24

snap lock

30

first sealing and compensation element

31

another sealing and compensation element

32

Form-fitting section

33

Shaft seal

34

Shaft seal

35

Drive element throttle shaft

36

shoulder

37

insert component

38

butt joint

40

angled spout

41

closest cross section

42

widest cross section

43

radial contact surface

44

molded sleeve section

45

feed hopper

46

inner wall

Claims (10)

1. Throttle apparatus for controlling a flow of fluid at an internal combustion engine, having a multi-part housing, the first housing part (2) and the further housing half of which are joined to one another at contact surfaces (15), and the flow of fluid is controlled by means of an areal valve element (21), which can be adjusted in the flow passage of the flow of fluid by means of an actuating drive, at least one sealing and compensation element (30, 31), the shape (45) of the inner wall (46) of which delimits the cross section of flow of the flow of fluid, being accommodated in the throttle apparatus (1), characterized in that this element (30, 31) comprises a bearing surface (43) which can be used to seal off housing-side cavities (10).
2. Throttle apparatus according to Claim 1, characterized in that the sealing and compensation element (30, 31) is designed as an insertable elastomer shaped part.
3. Throttle apparatus according to Claim 1, characterized in that the sealing and compensation element (30, 31) is made from deformable, hardenable material which is introduced between contact surfaces (15) of the multi-part housing of the throttle apparatus (1) during final assembly.
4. Throttle apparatus according to Claim 1, characterized in that at least one housing part (2) of the multi-part housing is divided, by rib-like webs (9), into cavities (10) inside which there flows a temperature-control medium for controlling the temperature of an inner wall (8) of the housing part (2).
5. Throttle apparatus according to Claim 4, characterized in that a housing part (2) with a supporting surface (7) for receiving a sealing and compensation element (30, 31) is formed at one of the end sides (15, 16) of the cavities (10).
6. Throttle apparatus according to Claim 2, characterized in that a sleeve portion (44) and/or a bearing surface (43) extending in the radial direction on the sealing and compensation element (30, 31) is formed at the sealing and compensation element (30, 31).
7. Throttle apparatus according to Claim 2, characterized in that an angled outlet (40) is formed integrally on the sealing and compensation element (30, 31) in the region of the narrowest cross section (41).
8. Throttle apparatus according to Claim 2, characterized in that an inner wall (46) of the sealing and compensation element (30, 31), from the widest cross section (42) to the narrowest cross section (41), has a profile corresponding to the lateral surface (45) of a truncated cone.
9. Throttle apparatus according to Claim 2, characterized in that the cross section of flow of the throttle apparatus (1) can be adapted as a function of the narrowest cross section (41) on the sealing and compensation element (30, 31), in such a way that throttle valve arrangements (37) of smaller diameter can be integrated into a given design of housing.
10. Throttle apparatus according to Claim 6, characterized in that one side of the radial bearing surface (43) of the sealing and compensation element (30, 31) seals off cavities (10) in a double wall (8, 11) of the housing part (2), and the other side of the radial bearing surface (43) of the sealing and compensation element (30, 31) bears against a contact surface, which is of corresponding design to the contact surface (15) of the housing part (2), of a further housing part of a multi-part housing.

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