DE102016206949A1 - Method for producing a structural unit, vulcanization tool and structural unit - Google Patents

Abstract

In a method for producing a structural unit (1) with a component (2) and an elastomeric seal (3), a vulcanization tool (7) having a first and a second tool mold (8, 9) is provided which together form a receiving space (12) for the component (2) and the elastomeric seal over. The first tool mold (8) forms a tool support surface (13) oriented perpendicularly, inclined or curved relative to a space longitudinal direction (LR), which is spaced from the second tool mold (9) and from a first space longitudinal end (10) of the receiving space (12). turned away and spaced. The second tool mold (9) forms at least one surface (16), which bounds the receiving space (12) at a second longitudinal space end (11), and leads to a supply channel. The component (2) is inserted into the first tool mold (8) in such a way that it is oriented perpendicularly, inclined or curved relative to the longitudinal direction of the component (LB), the first longitudinal end (4) of the component (2 ) axially facing component support surface (6) and the mold support surface (13) face each other. To form and attach the elastomeric seal (3) to the component (2), heated material containing rubber is supplied through the supply channel to a surface (17) of the component (2) at its second longitudinal end (5). Furthermore, a vulcanization tool and a structural unit are disclosed.

Description

Field of engineering

According to a first aspect of the invention, the invention relates to a method for producing a structural unit which has at least one component, preferably a valve body, and an elastomeric seal connected thereto. A second aspect of the invention relates to a vulcanization tool that can be used to produce such a structural unit. A third aspect of the invention relates to an assembly which can be produced by means of the method according to the invention and by means of the vulcanization tool according to the invention and which has at least one component, preferably an integrally formed valve body, and an elastomeric seal connected thereto.

State of the art

For attaching an elastomeric seal at an axial end of a component, such as. A valve body or a valve needle of an injection valve for a motor, in a vulcanization tool is with reference to 4 The technique described in the present application is known. A component which is cylindrical on its outer side (for example a valve body or a valve needle) is inserted into a recess of a first tool mold for producing and mounting an elastomeric seal, wherein the cylindrical recess is adapted for centering to the outer diameter of the component. A second tool mold, which forms a cavity for the elastomeric seal, is then placed and pressed against the first tool mold to seal the parting line between mold and component. The second tool mold presses against the axial end face of the component facing it. At the opposite, ie the rear end of the component is axially supported against a bottom of the recess. Consequently, the component or the valve body is acted upon in the prior art over its entire length with the tool closing force. The component must therefore be traditionally dimensioned over the entire length so that the axial forces necessary for sealing the tool can be accommodated. As a result, the component must be made more massive and thus heavier than required from a functional point of view. In an application of the component in an injection valve, for example as a valve body, this results in significant functional disadvantages. Due to the higher weight increases the inertia, which leads to an increase in the switching times of the injector. Furthermore, a higher risk of wear results at the axial abutment points of the component, since the higher mass leads to an increased impact energy. The inevitably more massive design of the component reduces the remaining cross section in the available installation space of the component. In an injection valve, the remaining cross section is used, in particular to guide gaseous or liquid fuel from the inlet of the injection valve to the nozzle. The smaller the remaining cross section, the more the pressure applied to the inlet of the injection valve is reduced within the injection valve. This reduces the flow at the nozzle of the injector. The reduced pressure further leads to a poorer mixture formation between the emerging from the injection valve fuel and the combustion air used. This results in reduced combustion efficiency and degraded emissions. In order to decouple the rear end of the valve body from the axial forces of the vulcanization tool and to allow a less massive design, valve body in the prior art are also made in several parts. In this case, the part that is involved in the vulcanization process, must be dimensioned according to the occurring axial forces. However, a multi-part design has the disadvantage that it is associated with higher production costs. These are created by the additional joining process and the necessary geometries on the individual parts. Due to the additional joining process, a lowering of the component accuracy is also to be expected in the case of a multi-part valve body since it is not possible, as in the case of a one-piece valve body, to mechanically process all functional surfaces in one clamping. In conventional vulcanization tools, the component is centered on the outside surfaces of the tool. As a result, the outer surfaces of the component can be scratched or otherwise damaged. In valve bodies of injection valves, these outer surfaces are used to guide the valve body in the injection valve. Damage to the outer surfaces of the valve body can lead to jamming in the injector, resulting in failure of the valve. In addition, the guide surfaces of the valve body are often coated in injectors. If the valve body is then subjected to the tool closing force over its entire length in the conventional method, an elastic deformation of the guide surfaces results, which can lead to the cracking of the layer.

A valve body with a vulcanized elastomeric seal is in the prior art DE 10 2006 006 883 A1 known.

Summary of the invention

Based on the described prior art, the invention according to its first aspect, the object of developing a method of the type mentioned advantageous. In particular, the aim is to avoid the limitations and disadvantages occurring in the prior art at least partially or as far as possible.

The object is achieved by a method for producing a structural unit, at least comprising a component, preferably a valve body, in particular for an injection valve of an engine or the like, and an associated elastomer seal, comprising the method steps:
Providing a component which extends along a component longitudinal direction from a first longitudinal end to a second longitudinal end and which forms between its longitudinal ends a component support surface oriented perpendicular, inclined or arched to the component longitudinal center axis, facing the first longitudinal end of the component, providing a vulcanization tool at least a first tool mold and a second mold, wherein the tool molds, when in use, arranged for use, in particular, are joined together, a along a space longitudinal direction from a first space longitudinal end to a second space longitudinal end extending receiving space for the component and for the elastomeric seal over, wherein the first tool mold a perpendicular, inclined or curved to the Raumlängsmittelachse oriented and facing away from the first Raumlängsende Werkzeugform-supporting surface formed by is spaced from the first space longitudinal end and which is spaced from the second tool mold, wherein the second tool mold forms at least one surface which in the use state, the receiving space on the second space longitudinal end, in particular frontally, bounded, and to the outside of the second tool mold at least one Feed channel leads, inserting the component in the first tool mold, so that the component support surface and the mold support surface facing each other for cooperation as an axial stop, in particular touching, arranging, in particular assembly and in particular compression of the first and the second tool mold, and for the formation and attachment of the elastomeric seal to the component supplying heated, rubber-containing, in particular liquid or pasty, material through the feed channel of the second tool mold to a, in particular frontal, surface of the component at its two Longitudinal end.

The supply of heated, rubber-containing, preferably liquid material through the at least one supply channel of the second tool mold is used by means of a vulcanization process to produce an elastomeric seal and to attach it to the component. The component can be, for example, a valve body, a valve needle or, for example, a solenoid armature, for example, in each case for an injection valve of an engine. The tool mold support surface and the component support surface may each optionally be perpendicular, inclined or curved to a spatial longitudinal center axis or component longitudinal center axis. The support surfaces may be formed, for example, as a respective planar surface. It is also conceivable, however, that the support can be realized via conical or spherical surfaces. Then you could under certain circumstances immediately realize the centering of the component on these surfaces. By having the axial stop formed by the component support surface and the tool mold support surface between the first and second longitudinal ends of the component, preferably in the vicinity of its second longitudinal end, it is advantageously achieved that the component is only part of its length , namely preferably only in a short longitudinal section adjoining the second longitudinal end, is acted upon by the tool closing force. Thus, the drawbacks that occur in the prior art according to the loading of the entire component with the tool closing force, avoided by the invention. The longitudinal end facing the first longitudinal end, ie the rear end of the valve body or even a lengthwise predominant length of the valve body can be decoupled from the axial forces necessary for Werkzeugabdichtung by these preferably as close to the front side (ie as close to the second longitudinal end) of the valve body be supported on the first tool shape. The component may, for example, be made of metal or plastic. Any material that is suitable for a vulcanization process and that has the properties required for such applications in the vulcanized state can be used to produce the elastomeric seal. One skilled in such materials are known. It is preferred that the component support surface extends perpendicular to the component longitudinal direction and that the tool mold support surface extends perpendicular to the space longitudinal direction, wherein the two directions are preferably parallel to each other. It is preferred that the component support surface and / or the tool mold support surface have a two-dimensional extent and overlap in a two-dimensional support area in a projection view guided parallel to the component longitudinal direction. However, the term component support surface and the term mold support surface have broader meaning. Accordingly, there is also the possibility that the component support surface has a one-dimensional, for example. Line-shaped or edge-shaped, extension and / or that the tool mold support surface is a one-dimensional, for example. has line-shaped or edge-shaped, extension. Preferably, the component support surface may be an annular surface. In the die support surface, a circular or annular surface is preferred.

There are numerous other possibilities for the advantageous embodiment of the method:
It is preferred that a first tool shape, a second tool shape and a component are used, which are geometrically matched to each other, so that when the component is inserted into the first tool mold and the first and the second tool mold are joined together for common bordering of the receiving space, a surface of the second tool mold, which frontally surrounds the receiving space, presses axially against the component in the direction of the first space longitudinal end and thereby presses its component support surface against the tool mold support surface. This has the advantageous effect that the axial stop for supporting the component not only when injecting the rubber material, but already when closing the mold is effective. Preferably, a component is used in which, with respect to a geometric component longitudinal center axis, the axial distance between its second longitudinal end and the component support surface is smaller than the axial distance between its first longitudinal end and the component support surface. In particular, it is preferred that the axial distance between the component support surface and the second longitudinal end of the component, ie along the component longitudinal direction or the central geometric component longitudinal center axis, is less than 10 percent of the total length of the component.

It is preferred that a sleeve-like, an inner cavity, in particular a central through hole, exhibiting component is used, the component support surface is formed on a, in particular stepped, reduction of the cavity cross-section, and that a first tool shape is used, which is a along the space longitudinal direction extending, in particular cylindrically bounded recess and a centering mandrel extending therein centrally along the space longitudinal direction, wherein the mold support surface is formed on the centering mandrel, in particular on its end-side end face or on an outside, in particular stepped, cross-sectional transition of the centering mandrel. Preferably, the inner cavity of the component has a diameter which is tuned to achieve a desired centering effect on a diameter of the centering mandrel. Advantageously, the inner cavity of the component can be designed as a central bore, which has a step near the second longitudinal end of the component or of the valve body. As a component-supporting surface, the step can have a surface, preferably closed on the circumference, around the geometric component longitudinal center axis, which faces the first longitudinal end of the component. A normal vector, which is perpendicular to this surface and directed away from this surface, shows, at least partially, in a direction to the first longitudinal end of the component. At one stage, the axial forces can be absorbed from the component or from the valve body and thus derived therefrom into the vulcanization tool. To relieve the component as much as possible of the axial forces, it is recommended that the said stage as close to the front, d. H. to be arranged close to the second longitudinal end of the component. In the mentioned development, the vulcanization tool can center the component or the valve body at its central bore by means of the centering mandrel. Thus, damage to the outer surfaces of the component or the valve body can be excluded. When the die support surface is formed on the centering mandrel, for example, on the end face thereof or on a step formed between the longitudinal ends of the centering mandrel, the centering mandrel performs a dual function.

It is preferred that a first tool mold is used, which is integrally formed or which has a separate mold part and the centering mandrel, which is then releasably halterbar on the mold part, so that the centering mandrel is axially supported thereon in the direction of the first space longitudinal end. A removable centering mandrel may be advantageous, since it is exchanged as a single part in the case of a priority wear, d. H. the remaining tool molding can still be used.

Preferably, it is envisaged that a component is used, from the inner cavity radially outwardly branch off at least two outflow openings, wherein the component support surface forming reduction of the cavity cross-section between the outflow openings and the second longitudinal end of the component is formed. Preferably, the component, apart from any existing outflow openings, rotationally symmetrical.

There is the possibility that a component is used which on its outside has a recess bordered by the component support surface, in particular a groove running around a geometric component longitudinal central axis, and in which a first tool shape is used, which extends along a space longitudinal direction , in particular cylindrically edged, has a recess, from the lateral surface of which engages in the position of use in the recess of the component, the Werkzeugform- Support surface forming projection protrudes radially inward. In this context, it is preferred that the projection is designed as an annular recess projecting around a geometric recess longitudinal central axis and that the first tool mold has two or more releasably assemblable molded parts which in their assembled state jointly overlie the recess of the first tool mold and which together form the annular projection. It would be conceivable, for example, that the first tool shape as a split tool consists of two half-shells. The half-shells can engage in an external groove on the component or valve body and support its axial forces there. However, the variant described above, in which the first tool mold has an integrally formed centering mandrel, on the other hand has the advantage that it can be realized simpler and cheaper.

It is considered appropriate that in a use state in which the first and the second tool mold are joined together to border the receiving space and in which the component is inserted into the receiving space, the first longitudinal end of the component is axially spaced from the first longitudinal space end and / or the component does not touch the radially inwardly facing surface of the first tool mold. By axially spacing the first longitudinal end of the component from the first space longitudinal end, it can be ensured that no axial forces occur or are transmitted there. If the component does not touch the radially inwardly facing surface of the first tool mold (in particular when using a centering mandrel), damage to the outer surfaces of the component by the vulcanization tool can be excluded.

It is preferred that a one-piece valve body is used as the component. As described, despite a one-piece design, the majority of the component contour can be decoupled from the axial force necessary to seal the vulcanization tool.

In a preferred application of the method, a second tool mold can be used, in which the receiving space on the second longitudinal space end frontally bordering surface is at least one annular, with the supply channel fluidly connected and concentric in a state of use to the geometrical Raumlängsmittelachse concentric recess is introduced. It is preferred that an annular bottom of the recess is convexly curved in a cross section, wherein the curvature may lie entirely within the recess or may protrude beyond the edge of the recess. It is preferred that a component is used, in which at its second longitudinal end befindlicher frontal surface an annular, concentric with the geometric component longitudinal central axis recess is introduced, which has an annular bottom, which is concavely curved in a cross section of the said annular bottom the second mold is axially spaced and overlaps said bottom of the second tool mold in an axial projection view wholly or partially. In such an embodiment, a quasi "beanförmigen" sealing cross-section result.

By the component or the valve body in the inventive method can be largely decoupled from the force necessary to seal the Vulkanisationswerkzeugs axial force, the component or the valve body can be made lighter and less massive, resulting in switching times of an injection valve, the wear on the axial attachment points a valve body and reduce the pressure loss in an injection valve. A one-piece design of the valve body also allows higher component accuracies at a comparatively lower production cost compared to a multi-part design and thus optimum function in an injection valve. By centering a valve body on a central, stepped bore damage to the outer surfaces can be excluded by the vulcanization. In this case, a simple, in particular stepped, centering mandrel for receiving the valve body can be used in the vulcanization tool.

According to a second aspect, the invention generically starts from a vulcanization tool having at least a first tool mold and a second mold, wherein the tool molds are suitable for assembly for a use state in which they together along a space longitudinal direction from a first space longitudinal end to a The second tool mold forms at least one surface which, in the use state, bounds the receiving space on the second longitudinal end wall, preferably on the front side and to the outside of the second mold, at least one supply channel for a liquid containing rubber or Mass leads.

Based on the disadvantages described in the prior art, the invention is therefore the object of developing such a Vulkanisationswerkzeug advantageous. In particular, it is desirable that the limitations and disadvantages described in the prior art can be at least partially or as far as possible avoided.

To solve the invention, the invention proposes that the first mold forms a perpendicular, inclined or curved to the Raumlängsmittelachse oriented and facing away from the first Raumlängsende Werkzeugform-Abstützoberfläche, which is spaced from the first Raumlängsende and in use from the second tool mold. For related effects and advantages, reference is also made to the foregoing description.

There are numerous possibilities for advantageous development:
It is preferred that the first tool mold has a centering mandrel extending along the spatial longitudinal direction, in particular cylindrically bounded, and a centering mandrel extending centrally along the spatial longitudinal direction, wherein the tool mold support surface on the centering mandrel, in particular on its end-side end face, or on an outside , in particular stepped, cross-sectional transition of the centering mandrel is formed. There is the possibility that the first tool mold is integrally formed or that the first tool mold has a tool molding and the centering, which is then releasably halterbar on the mold part, so that the centering mandrel is axially supported on the mold part in the direction of the first space longitudinal end. Alternatively or in combination, there is the possibility that the first tool mold has a recess extending along the spatial longitudinal direction, in particular cylindrically bounded recess, from the lateral surface of a projection projects radially inward, wherein the projection is formed as an annular circumferential projection around a geometric recess longitudinal central axis and the first Mold has two or more releasably composable mold parts, which together in the assembled state, the recess of the first mold together and form the annular projection together. Preferably, it is contemplated that the second tool mold in the use state, the receiving space on the second space longitudinal end frontally bordering surface into which at least one annular, with the supply channel fluidically connected recess is introduced, wherein it is particularly provided that an annular bottom of the recess is convexly curved in a cross section.

According to a third aspect, the invention relates generically to a structural unit which has at least one component, preferably an integrally formed valve body, and an elastomeric seal connected thereto, wherein the component extends along a component longitudinal direction from a first longitudinal end to a second longitudinal end.

For an advantageous development of such a structural unit, the invention proposes that the component has at its second longitudinal end an end surface in which an annular, concentric to a geometric component longitudinal direction recess is formed, wherein the recess has an annular bottom which is concave in a cross section is curved, that the elastomeric seal has an annular, in a cross-section convexly curved surface on which the elastomeric seal is fixed to the annular bottom, and that the side facing away from the component frontal surface of the elastomeric seal is concavely curved. In this context, for example, a quasi-beanförmigen cross section of the elastomeric seal be given.

Such an elastomeric seal advantageously allows for uniform thickness of the elastomer layer in its cross section, the formation of two axially projecting sealing edges. By the two circular sealing edges having different diameters, an effective double or chamber sealing can be achieved with a further component (for example an injection valve for a motor or the like).

There are numerous possibilities for advantageous development:
It is preferred that the component between its longitudinal ends a perpendicular, inclined or curved to a geometric (ie imaginary) component longitudinal axis oriented, the first longitudinal end of the component axially facing component-supporting surface. There is the possibility that the component is sleeve-like and has an inner cavity, such as a central through-opening, wherein the component-supporting surface is formed on a, in particular stepped, reduction of the cavity cross-section. It is preferred that at least two outflow openings branch off from the inner cavity radially outwards, and that the reduction in the cavity cross-section forming the component-supporting surface is formed between the outflow openings and the second longitudinal end of the component. Alternatively or in combination, there is the possibility that the component on its outside has a recess bordered by the component support surface, in particular a groove running around a geometric component longitudinal center axis. In each case insofar as possible effects and advantages, reference is also made to the preceding description.

• 1. Baueinheit, zumindest ein Bauteil und eine damit verbundene Elastomerdichtung aufweisend, wobei sich das Bauteil entlang einer Bauteillängsrichtung von einem ersten Längsende zu einem zweiten Längsende erstreckt, dadurch gekennzeichnet, dass das Bauteil an seinem zweiten Längsende eine stirnseitige Oberfläche aufweist, in die eine ringförmige, zu einer geometrischen Bauteillängsrichtung konzentrische Vertiefung eingebracht ist, wobei die Vertiefung einen ringförmigen Boden aufweist, der in einem Querschnitt konkav gewölbt ist, dass die Elastomerdichtung eine ringförmige, in einem Querschnitt konvex gewölbte Oberfläche aufweist, an der die Elastomerdichtung an dem ringförmigen Boden befestigt ist, und dass die von dem Bauteil abgewandte stirnseitige Oberfläche der Elastomerdichtung konkav gewölbt ist.
• 2. Baueinheit gemäß Aspekt 1, dadurch gekennzeichnet, dass das Bauteil zwischen seinen Längsenden eine senkrecht, geneigt oder gewölbt zu einer geometrischen Bauteillängsmittelachse orientierte, dem ersten Längsende des Bauteils axial zugewandte Bauteil-Abstützoberfläche aufweist.
• 3. Baueinheit gemäß Aspekt 2, dadurch gekennzeichnet, dass das Bauteil hülsenartig ausgebildet ist und einen inneren Hohlraum, wie insbesondere eine zentrale Durchgangsöffnung, aufweist, wobei die Bauteil-Abstützoberfläche an einer, insbesondere stufigen, Verringerung des Hohlraumquerschnittes ausgebildet ist.
• 4. Baueinheit gemäß Aspekt 3, dadurch gekennzeichnet, dass von dem inneren Hohlraum nach radial außen zumindest eine Ausströmöffnung abzweigt und dass die die Bauteil-Abstützoberfläche ausbildende Verringerung des Hohlraumquerschnitts zwischen der Ausströmöffnung und dem zweiten Längsende des Bauteils ausgebildet ist.
• 5. Baueinheit gemäß einem oder mehreren der Aspekte 1 bis 4, dadurch gekennzeichnet, dass das Bauteil an seiner Außenseite eine von der Bauteil-Abstützoberfläche berandete Ausnehmung, insbesondere eine um eine geometrische Bauteillängsmittelachse umlaufende Nut, aufweist.

In the following text, further aspects of the present disclosure are described, with the individual aspects numbered to facilitate reference to features of other aspects.

• 1 assembly, comprising at least one component and an elastomeric seal associated therewith, wherein the component extends along a longitudinal component direction from a first longitudinal end to a second longitudinal end, characterized in that the component has at its second longitudinal end an end surface into which an annular , wherein the recess has an annular bottom which is concavely curved in a cross section, the elastomeric seal having an annular, in a cross-section convexly curved surface on which the elastomeric seal is secured to the annular bottom , And that the side facing away from the component frontal surface of the elastomeric seal is concavely curved.
• 2. Assembly according to aspect 1, characterized in that the component between its longitudinal ends a perpendicular, inclined or curved oriented to a geometric component longitudinal central axis, the first longitudinal end of the component axially facing component-supporting surface.
• 3. Assembly according to aspect 2, characterized in that the component is sleeve-shaped and has an inner cavity, in particular a central passage opening, wherein the component-supporting surface is formed on a, in particular stepped, reduction of the cavity cross-section.
• 4. Assembly according to aspect 3, characterized in that branches off from the inner cavity radially outwardly at least one outflow opening and that the component-supporting surface forming reduction of the cavity cross-section between the outflow opening and the second longitudinal end of the component is formed.
• 5. Assembly according to one or more of aspects 1 to 4, characterized in that the component on its outer side a bounded by the component-supporting surface recess, in particular a circumferential circumferential part about a geometric component groove.

Brief description of the drawings

Preferred embodiments of the invention and an embodiment known from the prior art are described below with reference to the figures.

It shows:

1 in a sectional view schematically simplifies a vulcanization tool according to the invention with a structural unit according to the invention received therein after carrying out the method according to the invention, in each case according to a preferred embodiment;

2 in a sectional view which also in 1 shown assembly;

3 in a sectional view that also in 1 shown vulcanization tool and

4 a known from the prior art assembly in a conventional vulcanization tool.

Description of the embodiments

The in the 1 and 2 respectively shown assembly according to the invention 1 includes a metal-made component 2 in which example a valve body 2 ' for an injection valve, and at its one end frontally mounted elastomeric seal 3 , The component 2 extends along a component longitudinal direction L _B from a first longitudinal end 4 to a second longitudinal end 5 , Between the longitudinal ends 4 . 5 is on the component 2 a component support surface 6 designed to support the component 2 on a total with 7 designated vulcanization tool is used. With regard to the component longitudinal direction L _B or along the component longitudinal center axis M _B parallel thereto, the axial distance a between the component-supporting surface ( 6 ) and the second longitudinal end 5 smaller than the axial distance b between the component support surface 6 and the first longitudinal end 4 , In the example, the distance b is a little more than a factor of ten, that is, an order of magnitude larger than the distance a.

The vulcanization tool 7 includes in the example a first tool shape 8th and a second tool shape 9 , The 1 and 3 show the tool shapes 8th . 9 in a use state in which they are assembled for use so as to be common along a space longitudinal direction L _R from a first space longitudinal end 10 up to a second room longitudinal end 11 extending recording room 12 for the assembly 1 bounded. In the example chosen, the two tool molds mentioned are on each other at a joint parting line formed together 26 touching together. This is not mandatory. Alternatively, there is the possibility of an axial gap between the first tool mold 8th and the second tool shape 9 so that it is clear that the axial force for sealing an elastomeric cavity bounded by the second tool mold with the component acts only on the component or the valve body. In this way, a possible overdetermination and the associated risk could be avoided that not enough sealing force / axial force acts on the component or the valve body.

The first tool shape 8th forms a perpendicular to the space longitudinal direction L _R oriented mold support surface 13 made, for the axial support of the component 2 serves. This is in more detail to a radially outer annular portion of an end-side end face 14 a centering pin 15 , which in the example is an integral part of the first tool mold 8th is. The mold support surface 13 is in the example by the centering mandrel 15 , ie according to its length, from the first room longitudinal end 10 spaced. In addition, the mold support surface is 13 in the state of use also shown by the second tool shape 9 spaced. The mold support surface 13 is from the first room longitudinal end 10 turned away and the second room longitudinal end 11 facing. The second tool shape 9 has a surface 16 that the recording room 12 in the use state at the second room longitudinal end 11 bordered on the front. Starting from an outside of the second mold 9 performs a not shown in the figures with feed channel through the second mold 9 to the surface mentioned 16 and flows into the reception room 12 , The feed channel is used for supplying, for example, liquid or pasty, rubber-containing material for the production of the elastomeric seal 3 ,

The method according to the invention can preferably be carried out in such a way that the component 2 (ie the in 2 shown assembly 1 without the elastomeric seal formed thereon 3 ) into the first mold 8th is used, so that the component support surface 6 and the die support surface 13 to interact with each other as an axial stop touching and then that the second tool shape 9 with the first mold 8th is joined together. In the embodiment, the first tool shape 8th , the second tool shape 9 and the component 2 geometrically coordinated so that in this state the receiving space 12 at the second room longitudinal end 11 frontally bordering surface 16 the second tool shape 9 (see. 3 ) in the component longitudinal direction L _B parallel direction against one at the second longitudinal end 5 trained frontal surface 17 of the component 2 rests and when compressing the molds 8th . 9 supported on the other hand, so that the component support surface 6 in parallel to the component longitudinal direction L _B direction against the mold support surface 13 is pressed. As a result, that of the vulcanization tool 7 into the component 2 introduced axial forces (longitudinal forces) in the component 2 are effective only within the designated with the distance a longitudinal section. In the adjoining, much longer length section, which is designated by the distance b, these longitudinal forces do not work.

Starting from this state of use, the execution of the method according to the invention by the at least one, not shown in the figures, by the second tool shape 9 extending feed channel heated, rubber-containing and under a delivery pressure, preferably liquid material through the second tool mold to a between the front surface 17 of the component 2 and the frontal surface 16 the second tool shape 9 formed, preferably annular, cavity are supplied. This cavity can be the shape of the desired, on the component 2 to be attached elastomeric seal 3 have. By means of the action of temperature and pressure, the rubber-containing material vulcanizes and solidifies from its flowable state in a subsequent cooling, whereby the desired elastomeric seal 3 arises and firmly with the component 2 is connected.

In the embodiment shown is a sleeve-like component 2 chosen, which has an internal cavity 18 in the form of a central passage opening 19 having. The passage opening 19 points towards the second longitudinal end 5 of the component 2 a gradual reduction 20 of the cavity cross-section. This is in the range of an undercut 21 educated. The extending along the distance a component length portion with the reduced cavity cross-section forms a first longitudinal end 4 of the component 2 axially facing, the passage opening 19 on the circumference annularly enclosing and in the example to the component longitudinal center axis M _B vertical annular surface 22 from which the component support surface 6 forms. In the example, the component is 2 with the exception of the two vertically from the passage opening 19 branching outflow openings 23 formed rotationally symmetrical. The surface of the passage opening 19 and the outer surface of the component 2 therefore extend concentrically to the geometric component longitudinal center axis M _B.

In the example is a first tool shape 8th selected, the one extending along the spatial longitudinal direction L _R and concentric with the Raumlängsmittelinsachse M _R extending cylindrical recess 24 having. Starting from one at the first room end 10 trained soil 25 extends the centering mandrel 15 with compared to the recess 24 smaller diameter in the direction of the second space longitudinal end 11 , in the example to slightly above one between the tool shapes 8th . 9 formed parting line 26 out. The centering pin 15 runs concentrically to the spatial longitudinal center axis M _R. It has a cylindrical outer contour which, apart from a chamfer at the free longitudinal end, has a constant diameter d. In this one Length of the centering mandrel 15 associated longitudinal section of the component 2 has its cavity 18 a uniform diameter D. This is adapted to the diameter d to achieve a centering seat (ie, for example, to achieve a slight play or transition fit). The outer diameter of the end face 14 of the centering mandrel 15 is like 1 illustrated, larger than the diameter of the adjacent passage opening 19 of the component 2 , so that an annular contact zone results in the formation of an axial positive connection or stop. In the example is an integral tool shape 8th selected.

1 shows that in a use state in which the first and the second tool mold 8th . 9 to the border of the recording room 12 suitable for a condition of use and in the example touching together and in which the component 2 in the recording room 12 located, the first longitudinal end 4 of the component 2 axially from the first room longitudinal end 10 is spaced apart and the component 2 the radially inward facing surface 27 the first tool shape 8th not touched.

In the example chosen, the component is 2 around a one-piece valve body 2 ' for an injection valve of an engine.

In the example is a second tool shape 9 chosen in which the recording room 12 at the second room longitudinal end 11 frontally bordering surface 16 an annular, with the feed channel, not shown in the figures fluidly connected recess 28 is introduced. This extends in the example. In 3 shown use state concentric with the geometric component longitudinal center axis M _B. the depression 28 has an annular bottom 29 , This is in through the geometrical Raumlängsmittelsachse M _R leading cross sections (such as, for example, in cross section 3 ) convexly curved. The component 2 has at its at the second longitudinal end 5 lying frontal surface 17 also an annular recess 30 , This extends concentrically to the geometric component longitudinal center axis M _B and has an annular bottom 31 , in the leading through the component longitudinal axis M _B cross sections (such as, for example, the cross section of 1 ) is concave. The floor 29 is from the ground 31 axial, that is in parallel to the component longitudinal axis M _B parallel direction, spaced. The bulges of the floors 29 and 31 are matched to their axial distance, that with respect to a (not shown in the figures) common imaginary circle center of the radial distance between the floors 29 and 31 is uniform throughout the cross section. If the component 2 in the vulcanization tool 7 is used, this results before feeding the rubber-containing liquid mass along the circumference of a ring-segment-shaped cross-section, which could be approximately also referred to as something "bean-shaped". This cross section also corresponds at least approximately to the cross section of the in the vulcanization tool 7 elastomeric seal formed by the supply of the rubber-containing material 3 , The circumferential cross-section of the elastomer seal 3 forms two circular sealing edges 32 of different diameter, which extend concentrically to the component longitudinal axis M _B and axially over the surface 17 of the component 2 protrude. In the described embodiment, the component longitudinal center axis M _B and the spatial longitudinal center axis M _{R are} geometrically on a common straight line.

In the 1 to 3 no centering of the tool shapes is shown to each other. This could for example be realized by a radial centering of a tool shape in the other tool shape or, for example. By positioning pins in a mold, which are guided and / or centered in holes of the other tool shape. This can have an advantageous effect on the positioning accuracy of the elastomeric seal on the component. In the embodiment shown in the figures, the valve body is in the mold 8th centered, and the elastomeric cavity is in the mold 9 , In case of insufficient positioning of the molds with each other, the positional accuracy of the vulcanized elastomer to the valve body may be insufficient. Remedy for this can be created by a centering of the molds to each other. Another possibility is seen in the component or the valve body with a mandrel, located in the mold 9 (which also surrounds the elastomeric cavity) to center. Such a centering mandrel could in the reduced cross-section bore (see, eg. 2 ) of the valve body centering engage. In this context, it would be useful if the additionally existing mandrel 15 in the mold 8th has a certain radial clearance to the inner cross section or inner diameter of the valve body, so that no radial overdetermination is possible. In such an embodiment, the mandrel would 15 in the mold 8th then only serve to absorb the axial forces.

4 shows a known from the prior art embodiment of a structural unit 1'' that is a component 2 '' (in the example, a valve body) and an elastomeric seal attached thereto 3 '' includes. The illustration shows the tool in a vulcanization tool 7 '' which is a first tool mold 8th'' and a second tool shape 9 '' includes. The elastomer seal 3 '' was made by having an in 4 not shown supply channel through the second tool shape 9 '' liquid Rubber-containing material in a front side of the component 2 '' injected cavity was injected. The component 2 '' has a passage opening 19 '' with a constant diameter throughout. Therefore, the component is 2 '' at its first longitudinal end 4 '' axially against the mold 8th'' supported by the second tool shape 9 '' into the component 2 '' to absorb initiated axial force. For centering the component 2 '' owns this on its outer surface 33 '' the same diameter as the recess 24 '' of the vulcanization tool 7 '' and is due to the first tool shape 8th'' so there is a risk of damage.

All disclosed features are essential to the invention (individually, but also in combination with one another). The subclaims characterize with their features independent inventive developments of the prior art, in particular to make on the basis of these claims divisional applications.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006006883 A1 [0003]

Claims (17)

Method for producing a structural unit ( 1 ), which is at least one component ( 2 ), in particular a valve body ( 2 ' ), and an elastomeric seal ( 3 ), the method comprising the following steps: - providing a component ( 2 ) extending along a component longitudinal direction (L _B ) from a first longitudinal end (L _B ). 4 ) to a second longitudinal end ( 5 ) and that between its longitudinal ends ( 4 . 5 ) a perpendicular, inclined or curved to the component longitudinal direction (L _B ) oriented, the first longitudinal end ( 4 ) of the component ( 2 ) axially facing component support surface ( 6 ), - providing a vulcanization tool ( 7 ), which is at least a first tool mold ( 8th ) and a second tool shape ( 9 ), wherein the tool forms ( 8th . 9 ), when in use, are arranged for use together along a space longitudinal direction (L _R ) from a first space longitudinal end (FIG. 10 ) to a second room longitudinal end ( 11 ) extending receiving space ( 12 ) for the component ( 2 ) and for the elastomeric gasket, the first mold ( 8th ) a perpendicular, inclined or curved to the space longitudinal direction (L _R ) oriented and from the first space longitudinal end ( 10 ) facing away from the mold support surface ( 13 ) formed by the first room longitudinal end ( 10 ) and in the use state of the second tool mold ( 9 ), wherein the second tool mold ( 9 ) at least one surface ( 16 ), which in use condition the receiving space ( 12 ) at the second room longitudinal end ( 11 ), in particular frontally, bounded, and to the outside of the second tool mold ( 9 ) leads at least one supply channel, - inserting the component ( 2 ) into the first tool mold ( 8th ), so that the component support surface ( 6 ) and the mold support surface ( 13 ) lie opposite one another, in particular touching, - arranging the tool molds ( 8th . 9 ) to each other for the use state, in particular compression of the first and the second tool mold ( 8th . 9 ), and - feeding heated, rubber-containing, in particular liquid or pasty, material through the feed channel of the second tool mold ( 9 ) to a, in particular end-side, surface ( 17 ) of the component ( 2 ) at its second longitudinal end ( 5 ) for the formation and attachment of the elastomeric seal ( 3 ) on the component ( 2 ). Method according to the preceding claim, characterized in that a first tool mold ( 8th ), a second tool shape ( 9 ) and a component ( 2 ) are used, which are geometrically matched to one another such that when the component ( 2 ) into the first tool mold ( 8th ) and the first and second tool molds ( 8th . 9 ) to the common boundary of the recording room ( 12 ), the reception room ( 12 ) frontally bordering surface ( 16 ) of the second tool mold ( 9 ) axially towards the first space longitudinal end ( 10 ) against the component ( 2 ) and thereby its component support surface ( 6 ) against the mold support surface ( 13 ) presses. Method according to one or more of the preceding claims, characterized in that a component ( 2 ) is used, in which with respect to a geometric component longitudinal center axis (M _B ) of the axial distance (b) between its second longitudinal end ( 5 ) and the component support surface ( 6 ) smaller than the axial distance (a) between its first longitudinal end (a) 4 ) and the component support surface ( 6 ). Method according to one or more of the preceding claims, characterized in that a sleeve-like, an inner cavity ( 18 ), in particular a central passage opening ( 19 ), having component ( 2 ) whose component support surface ( 6 ) at a, in particular tiered, reduction ( 20 ) of the cavity cross-section is formed, and that a first tool mold ( 8th ) is used, which is a along the spatial longitudinal direction (L _R ) extending, in particular cylindrically edged recess ( 24 ) and a centrally extending therein along the space longitudinal direction (L _R ) centering mandrel ( 15 ), wherein the mold support surface ( 13 ) on the centering mandrel ( 15 ), in particular at its end face ( 14 ) or on an outside, in particular stepped, cross-sectional transition of the centering mandrel ( 15 ), is trained. Method according to the preceding claim, characterized in that a first tool mold ( 8th ) is used, which is integrally formed or a tool molding and the centering mandrel ( 15 ), wherein the centering mandrel ( 15 ) is releasably halterbar on the mold part, so that the centering mandrel ( 15 ) in the direction of the first room longitudinal end ( 10 ) is axially supported. Method according to one or both of claims 4 and 5, characterized in that a component ( 2 ) is used, from its inner cavity ( 18 ) radially outward at least one outflow opening ( 23 ), wherein the component support surface ( 13 ) forming reduction of the cavity cross-section between the at least one outflow opening ( 23 ) and the second longitudinal end ( 5 ) of the component ( 2 ) is trained. Method according to one or more of the preceding claims, characterized in that a component ( 2 ) is used, which on its outside one of the component support surface ( 6 ) bounded recess, in particular a circumferential part about a geometric component longitudinal axis (M _B ) groove, and that a first tool mold ( 8th ) is used, which has a recess along a space longitudinal direction (L _R ) extending, in particular cylindrically edged, ( 24 ), from whose lateral surface a in the position of use in the recess of the component ( 2 ) engaging the die support surface ( 13 ) forming projection protrudes radially inward. Method according to one or more of the preceding claims, characterized in that in a use state in which the first and the second tool molds ( 8th . 9 ) to the border of the receiving space ( 12 ) and in which the component ( 2 ) in the reception room ( 12 ), the first longitudinal end ( 4 ) of the component ( 2 ) axially from the first space longitudinal end ( 10 ) is spaced and / or the component ( 2 ) the radially inwardly facing surface ( 27 ) of the first tool mold ( 8th ) not touched. Method according to one or more of the preceding claims, characterized in that as component ( 2 ) a one-piece valve body ( 2 ' ) is used. Method according to one or more of the preceding claims, characterized in that a second tool mold ( 9 ) in which the receiving space ( 12 ) at the second room longitudinal end ( 11 ) frontally bordering surface ( 16 ) at least one annular, with the supply channel fluidly connected and in a state of use to the geometrical Raumlängsmittelachse (M _R ) concentric recess ( 28 ) is trained. Method according to one or more of the preceding claims, characterized in that an annular bottom ( 29 ) of the depression ( 28 ) is convexly curved in a cross-section and that a component ( 2 ) used at its second longitudinal end ( 5 ) a frontal surface ( 17 ), in which an annular, concentric to the geometrical component longitudinal center axis (M _B ) depression ( 30 ), wherein the depression ( 30 ) an annular bottom ( 31 ), the soil ( 31 ) is concavely curved in a cross section, of the annular bottom ( 29 ) of the second tool mold ( 9 ) is axially spaced and overlaps it in an axial projection view. Vulcanization tool ( 7 ), comprising at least a first tool mold ( 8th ) and a second tool shape ( 9 ), the tool shapes ( 8th . 9 ) are suitable for common use in a state of use, in which they are common along a space longitudinal direction (L _R ) of a first space longitudinal end ( 10 ) to a second room longitudinal end ( 11 ) extending receiving space ( 12 ), the second tool shape ( 9 ) at least one surface ( 16 ), which in use condition the receiving space ( 12 ) at the second room longitudinal end ( 11 ), in particular frontally, bounded and to the outside of the second tool mold ( 9 ) leads at least one feed channel, characterized in that the first tool mold ( 8th ) a perpendicular, inclined or curved to the space longitudinal direction (L _R ) oriented and from the first space longitudinal end ( 10 ) facing away from the first cavity end support surface ( 10 ) and the second tool mold ( 9 ) is spaced. Vulcanization tool ( 7 ) according to claim 12, characterized in that the first tool mold ( 8th ) extending along the spatial longitudinal direction (L _R ), in particular cylindrically edged, recess ( 24 ) and a centrally extending therein along the space longitudinal direction (L _R ) centering mandrel ( 15 ), wherein the mold support surface ( 13 ) on the centering mandrel ( 15 ), in particular at its end face ( 14 ), or on an outside, in particular stepped, cross-sectional transition of the centering mandrel ( 15 ), is trained. Vulcanization tool ( 7 ) according to claim 13, characterized in that the first tool mold ( 8th ) is integrally formed or that the first tool mold ( 8th ) a tool molding and the centering mandrel ( 15 ), which is releasably halterbar on the mold part, so that the centering mandrel ( 15 ) on the tool molding in the direction of the first space longitudinal end ( 10 ) is axially supported. Vulcanization tool ( 7 ) according to one or more of claims 12-14, characterized in that the first tool mold extends along the spatial longitudinal direction (L _R ) extending, in particular cylindrically edged recess ( 24 ), protruding from the lateral surface of a projection radially inwardly, wherein the projection is designed as a circumferential circumferential axis around a geometric Ausnehmungslängsmittelachse and the first tool mold ( 8th ) has two or more releasably composable moldings, in the assembled state, the recess ( 24 ) of the first mold together and form the annular projection together. Vulcanization tool ( 7 ) according to one or more of claims 12-15, characterized in that in the surface ( 16 ) The second Tool shape ( 9 ), which in the use state the receiving space ( 12 ) at the second room longitudinal end ( 11 ) bordered on the front side, at least one annular recess fluidically connected to the supply channel ( 28 ), wherein in particular it is provided that an annular bottom ( 29 ) of the depression ( 28 ) is convexly curved in a cross section. Assembly ( 1 ), at least one component ( 2 ) and an associated elastomeric seal ( 3 ), wherein the component ( 2 ) along a component longitudinal direction (L _B ) from a first longitudinal end ( 4 ) to a second longitudinal end ( 5 ), characterized in that the component ( 2 ) at its second longitudinal end ( 5 ) an end surface ( 17 ), in which an annular, concentric to a geometric component longitudinal direction (L _B ) depression ( 30 ), wherein the depression ( 30 ) an annular bottom ( 31 ), which is concavely curved in a cross section, that the elastomeric seal ( 3 ) has an annular, in a cross-section convexly curved surface on which the elastomeric seal ( 3 ) at the annular bottom ( 31 ) and that of the component ( 2 ) facing away from the front surface ( 34 ) of the elastomeric seal ( 3 ) is concave.

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