阅读说明：本技术 用于有目的地进行废气再循环的控制翻盖及其制造方法 (Control flap for targeted exhaust gas recirculation and method for producing the same ) 是由 拉尔夫·巴克 杰拉尔德·韦德金德 博多·沃特斯特罗特 迪尔克·纳格尔 托马斯·凯泽 于 2021-03-31 设计创作，主要内容包括：本发明涉及用于有目的地进行废气再循环的控制翻盖及其制造方法。控制翻盖(1)由翻盖本体(2)和环绕的密封件(3)构成,密封件以密封的方式能止挡到待密闭的开口(8)的密封面(7)上,其中,翻盖本体(2)由热塑性塑料构成,并且密封件(3)由弹性体构成。本发明的特征在于,密封件(3)经由由热塑性塑料构成的压板(4)与翻盖本体(2)连接。(The invention relates to a control flap for targeted recirculation of exhaust gases and to a method for producing the same. The control flap (1) is formed by a flap body (2) and a circumferential sealing element (3) which can be brought into a sealing contact with a sealing surface (7) of an opening (8) to be closed, wherein the flap body (2) is formed from a thermoplastic and the sealing element (3) is formed from an elastomer. The invention is characterized in that the sealing element (3) is connected to the flap body (2) via a pressure plate (4) made of thermoplastic.)

1. A control flap (1) consisting of a flap body (2) and a circumferential sealing element (3) which can be brought to a stop in a sealing manner against a sealing surface (7) of an opening (8) to be closed, wherein the flap body (2) consists of a thermoplastic and the sealing element (3) consists of an elastomer,

it is characterized in that the preparation method is characterized in that,

the sealing element (3) is connected to the flap body (2) via a pressure plate (4) made of thermoplastic.

2. Control flap (1) according to claim 1,

it is characterized in that the preparation method is characterized in that,

the flap body (2) has a formation (16) for accommodating the seal (3) and the pressure plate (4), and

the profile (16) forms a circumferential front stop surface (17) toward the seal (3).

3. Control flap (1) according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the sealing element (3) has a convex sealing lip (6) facing the sealing surface (7).

4. Control flap (1) according to one of claims 1 to 3,

it is characterized in that the preparation method is characterized in that,

the seal (3) has a lateral recess (10) for receiving a rim section (11) of the pressure plate (4).

5. Control flap (1) according to claim 4,

it is characterized in that the preparation method is characterized in that,

the pressure plate (4) has a first fastening projection (18) on its edge section (11) toward the adjacent inner contact surface (12) of the seal (3).

6. Control flap (1) according to one of claims 2 to 5,

it is characterized in that the preparation method is characterized in that,

the circumferential front stop surface (17) of the profile (16) of the flap body (2) has a second fastening projection (19) facing the rearward contact surface (14) of the seal (3).

7. Control flap (1) according to one of claims 1 to 6,

it is characterized in that the preparation method is characterized in that,

the pressure plate (4) has a central receiving recess (22) with a central ventilation opening (23), and

the profile (16) of the flap body (2) has a central connecting truncated cone (24) which is received by a receiving recess (22) of the pressure plate (4).

8. Control flap (1) according to one of claims 1 to 7,

it is characterized in that the preparation method is characterized in that,

the pressing plate (4) and the flip body (2) are made of the same thermoplastic plastics.

9. Control flap (1) according to one of claims 1 to 8,

it is characterized in that the preparation method is characterized in that,

the pressing plate (4) is welded with the flip body (2).

10. Control flap (1) according to one of claims 1 to 9,

it is characterized in that the preparation method is characterized in that,

the thermoplastic is based on at least one polyamide and has a glass fiber content.

11. Control flap (1) according to one of claims 1 to 10,

it is characterized in that the preparation method is characterized in that,

the seal (3) is made of fluororubber.

12. Method for manufacturing a control flap (1) according to one of claims 1 to 11,

it is characterized in that the preparation method is characterized in that,

the following steps are carried out:

a) the flap body (2) is produced from thermoplastic in an injection molding method;

b) producing a pressure plate (4) from a thermoplastic in an injection molding method;

c) producing the seal (3) from an elastomer in an injection molding process;

d) -introducing the pressure plate (4) into a side recess (10) of the seal (3);

e) the pressure plate (4) is inserted together with the seal (3) into a shaped section (16) of the flap body (2), and

f) and connecting the pressing plate (4) with the flip body (2).

Technical Field

The invention relates to a control flap comprising a flap body and a circumferential sealing element which can be brought to a stop in a sealing manner against a sealing surface of an opening to be closed, wherein the flap body is made of a thermoplastic and the sealing element is made of an elastomer.

The invention also relates to a method for manufacturing a control flap.

Background

Control flaps are, for example, inserted on the cold side of the turbocharger in modern internal combustion engines with integrated turbochargers in order to be able to achieve a controlled exhaust gas recirculation on the low-pressure side (suction side). By means of the exhaust gas recirculation, it is possible to reduce the power "without throttling". This means that the more the exhaust gas is recirculated, the less combustion and the lower the power. Thereby increasing the efficiency of the engine and correspondingly reducing fuel consumption and carbon dioxide emissions.

EP 0717815B 1 discloses a control flap for exhaust gas recirculation on the low-pressure side of a turbocharger, which control flap is composed of a flap body and a seal designed as a sealing ring, which can be brought into contact in a sealing manner with the sealing surface of the opening to be closed, wherein the flap body is composed of a thermoplastic and the seal is composed of an elastomer.

It is proposed that such two-part control flaps be produced by a two-component injection molding method (2K injection molding technique).

However, it is disadvantageous here that, in particular when the control flap is used for targeted exhaust gas recirculation on the low-pressure side of the turbocharger, the plastic is permanently exposed to a temperature of approximately 230 ℃ in the installed state. Inexpensive high-temperature plastics, such as polyamide 4.6, are within limits at this temperature level, whereby the mechanical properties of the plastic are significantly reduced and the surface of the plastic may be damaged. With the result that component failure or loss of sealing function occurs. Thus, for example, the surface may be carbon-deposited. There is thus a risk that fragments may be detached from the plastic surface and thus may damage the engine or turbocharger, or that the injected rubber seal will no longer adhere firmly to the surface of the plastic.

Other plastics, such as polyphenylene sulfide (PPS), are extremely difficult to form an adhesive connection with, for example, elastomers, such as rubber, and therefore generally do not maintain the desired service life of such components. Depending on the processing, adhesion promoters must be applied to the plastic/thermoplastic before the elastomer is vulcanized. This adhesion promoter generally consists of a precursor whose task is to form a good adhesion to the plastic, that is to say to the thermoplastic, and whose task of adhesion is to form a good connection to the elastomer. In order to attach the precursors to the plastic, the plastic surface has to be pretreated, for example degreased or reactivated by plasma treatment.

Some plastics are very "media resistant". In this case, the plastic is difficult to bond to the adhesion promoter. In order to enable the adhesion promoter to achieve at least a certain adhesion, the surface is reactivated, which can be achieved, for example, by plasma treatment of the surface. The disadvantages of these processes are, on the one hand, the high process costs and, on the other hand, the short reprocessing times.

Disclosure of Invention

The object of the present invention is to improve the known control flap such that an improved, inexpensive, durable and reliable connection is achieved between the flap body made of thermoplastic and the seal made of elastomer.

A further object of the present invention is to provide a method for producing a control flap according to the invention.

This object is achieved in combination with the features of the preamble of claim 1 in that the sealing element is connected to the flap body via a pressure plate made of thermoplastic.

The term sealing element in the sense of the present invention is to be understood to mean not only a sealing ring but also a sealing element which is not surrounded by a circle, since the control flap with the flap body does not have to be circular in any way, and accordingly the opening to be closed by the control flap does not have to be circular in any way.

Surprisingly, it has been shown that the three-piece flap design of the control flap according to the invention is not only more reliable and durable in terms of the connection between the flap body and the seal of the control flap, but is also less expensive to produce than the known two-piece flap designs.

Preferred embodiments are the subject of the dependent claims.

According to a preferred embodiment of the invention, the flap body has a profile for receiving the sealing element and the pressure plate, wherein the profile forms a circumferential front stop face toward the sealing element. As mentioned above, the circumferential inner contact surface can also be annular.

According to a further preferred embodiment, the sealing surface of the seal facing the opening to be closed has a convex sealing lip. A particularly elastic and good seal can be achieved by the convex shape of the sealing lip.

The seal can furthermore have a lateral recess for receiving a rim section of the pressure plate. By means of the undercut, the pressure plate can be "tied" into the seal made of elastomer, i.e. can be inserted relatively firmly. Subsequently, the pressure plate together with the seal can be inserted into the profile of the flap body and, for example, welded.

According to a further preferred embodiment of the invention, the pressure plate has a first fixing projection on its edge section towards the adjacent inner contact surface of the seal. The first fastening projection is in this case designed as a convex or conical nose which is pressed into the adjacent inner contact surface of the sealing element and supports the fastening of the sealing element.

According to a further preferred embodiment of the invention, the circumferential front stop surface of the profile of the flap body has a second fastening projection facing the adjacent rearward contact surface of the seal. The second fastening projection is also designed here as a convex or conical nose which is pressed into the adjacent rearward contact surface of the sealing element and supports the fastening of the sealing element. The sealing element is thereby additionally fixed both on its inner contact surface and on a rearward contact surface spaced apart from the inner contact surface by the fixing projections.

According to a further preferred embodiment of the invention, the pressure plate has a central receiving recess with a central ventilation opening. The profile of the flap body has a central connecting truncated cone which is received by the receiving recess of the pressure plate. When the receiving recess and the connecting cone are joined together, air can escape through the central ventilation opening. The pressure plate and the flap body can be connected to one another, for example by welding, via a connecting cone in the center of the flap body and the receiving recess of the pressure plate.

In particular, for the purpose of welding, the pressure plate and the flap body are composed of the same thermoplastic. The welding can advantageously be carried out here, for example, by ultrasonic welding or by friction welding.

According to a further preferred embodiment of the invention, the thermoplastic is based on at least one polyamide. To increase the strength and the heat resistance, thermoplastics have a glass fiber content. Thermoplastics known under the designation "PA 66+ PA6, MHR, 14-11ON, GF 35" according to ISO 1874 have proved particularly suitable.

According to a further preferred embodiment of the invention, the seal is composed of an elastomer, which is a Fluoroelastomer (FKM) and has proven to be particularly suitable.

This object is achieved with respect to a method for producing a control flap by carrying out the following steps:

a) the flap body is produced from thermoplastic in an injection molding method;

b) producing a pressure plate from a thermoplastic in an injection molding process;

c) producing the seal from an elastomer in an injection molding process;

d) introducing a pressure plate into the side recess of the seal;

e) the pressure plate and the sealing element are inserted into the shaping of the flap body, and

f) the pressing plate and the flip body are connected.

The process according to the invention avoids, on the one hand, costly and expensive two-component injection molding processes and, on the other hand, the use of adhesion promoters and other surface treatments for the individual material components.

Drawings

Other features and advantages of the present invention will be apparent from the following detailed description and the accompanying drawings. Wherein:

FIG. 1: a side view showing in cross section the control flap and the opening to be sealed and the sealing face;

FIG. 2: a side view of the control flap of fig. 1 is shown in cross-section;

FIG. 3: from direction III, a side view of the control flap of fig. 2 is shown;

FIG. 4: a side view showing detail IV of figure 2 in cross-section;

FIG. 5: a side view of the seal of figure 1 in cross-section;

FIG. 6: a side view of the seal of fig. 5 is shown from direction VI;

FIG. 7: a side view of detail VII of figure 5 in cross-section;

FIG. 8: a side view of the platen of figure 1 in cross-section; and

FIG. 9: a side view of the flip body of fig. 1 is shown in cross-section.

Detailed Description

The control flap 1, which can be used in particular as a control flap (exhaust gas recirculation flap) for exhaust gas recirculation on the low-pressure side of a turbocharger (not illustrated), is essentially formed by a flap body 2, a seal 3 and a pressure plate 4.

According to the exemplary embodiment in fig. 1, the control flap 1 is mounted so as to be pivotable about an axis 5 and, in the closed position, rests with the sealing lip 6 of its seal 3 against the sealing surface 7 of the opening 8 to be closed. Due to the required strength, the flap body 2 and the pressure plate 4 are each composed of thermoplastic. Although in principle different thermoplastics can be used for the flap body 2 and the pressure plate 4, it has proven suitable to use the same thermoplastic when connecting the flap body 2 and the pressure plate 4 by means of a welding method. Due to the required elasticity of the seal 3, it has proven to be suitable to construct the seal 3 from an elastomer.

According to the exemplary embodiment of fig. 1 to 9, the seal 3 has a sealing lip 6, which is convex in shape, toward the sealing surface 7. Furthermore, the sealing element 3 has an annular end face 9 facing the sealing surface 7, beyond which the sealing lip 6 projects in the direction of the sealing surface 7, i.e. away from the pressure plate 4. The sealing element 3 has, in the direction of the flap body 2, a lateral recess 10 remote from the sealing lip 6 and the end face 9, which serves to receive a circumferential rim section 11 of the pressure plate 4. The lateral recess 10 has an inner contact surface 12, against which the pressure plate 4 rests with a rearward stop surface 13 of its edge section 11. The seal 3 has a rearward abutment surface 14 spaced from the inner abutment surface 12.

On its front side 15 facing the sealing surface 7 to be sealed, the flap body 2 has a profile 16 with a circumferential front stop surface 17 against which the sealing element 3 is stopped with its rearward contact surface 14 in the installed state.

In the exemplary embodiment, the rearward stop surface 13 of the pressure plate 4 has a first fastening projection 18 on its edge section 11 toward the adjacent inner contact surface 12 of the seal 3. The first fastening projection 18 is designed here as a convex or conical nose which presses into the adjacent inner contact surface 12 of the sealing element 3 and supports the fastening of the sealing element 3 in the installed state. Correspondingly, the front stop surface 17 of the flap body 2 has a second fastening projection 19 toward the rearward contact surface 14 of the seal 3. Like the first fixing projection 18, the second fixing projection 19 is configured as a convex or conical nose. The second fastening projection 19 is pressed into the adjacent rearward contact surface 14 of the sealing element 3 and also supports the fastening of the sealing element 3 in the installed state. The sealing element 3 is therefore additionally secured by the securing projections both on its inner contact surface 12 and on its rearward contact surface 14 spaced apart from it, and is clamped firmly in the assembled state between the pressure plate 4 and the flap body 2.

The undercut 10 allows the pressure plate 4 made of thermoplastic to be "bound" into the seal 3 made of elastomer, i.e. to be inserted relatively firmly. Subsequently, the pressure plate 4 together with the seal 3 can be inserted into the shaping 16 of the flap body 2 and the pressure plate 4 can be connected to the flap body 2, for example by welding.

The pressure plate 4 has a front face 20 facing the opening 8 to be closed and a rear face 21 facing the front stop face 17 of the flap body 2, which rear face has a central reception recess 22 in the shape of a truncated cone. The pressure plate 4 can furthermore have a central ventilation opening 23 which is connected to the receiving recess 22. The profile 16 of the flap body 2 has a central connecting truncated cone 24 which is at least partially received by the receiving recess 22 of the pressure plate 4. When the receiving depression 22 and the connecting truncated cone 24 are joined together, air can escape through the central ventilation opening 23. Via a central connecting truncated cone 24 of the flap body 2 and the receiving recess 22 of the pressure plate 4, the pressure plate 4 (with the captive, i.e. with the inserted seal 3) and the flap body 2 can be connected to one another, for example by plastic welding.

The thermoplastic used for the flap body 2 and the pressure plate 4 is a thermoplastic based on at least one polyamide.

To increase the strength and the heat resistance, thermoplastics have a glass fiber content. Thermoplastics known under the designation "PA 66+ PA6, MHR, 14-11ON, GF 35" according to ISO 1874 have proved to be particularly suitable.

It has been shown that Fluororubbers (FKM) are suitable as elastomers for the seal 3.

List of reference numerals

1 controlling a flip

2 flip body

3 sealing element

4 pressing plate

5 axes of rotation

63 of a sealing lip

7 sealing surface

8 opening

93 end face of the shaft

103 of the side recess

114 edge section

1210 inner abutting surface

134/11 rearward stop surface

143 rearward facing abutment surface

152 front side of the container

162 forming part

172 front stop face

1813 first fixing protrusion

1917 second fixing protrusion

204 front side of the front panel

214 rear side

224 of the container

234 of the container

242 of a connecting truncated cone