DE102009038080A1 - Connecting arrangement for high pressure fuel pump of internal combustion engine, has recess circulating in circumferential direction of connecting element, where contour of another connecting element is accommodated in sections by recess - Google Patents

Abstract

The arrangement (10) has connecting elements (12, 14) connected by radial fastening in connecting areas (16, 18) of the connecting elements. A recess (22) e.g. groove, is formed within the connecting area of one of the connecting elements. The recess circulates in a circumferential direction of the connecting element in sections, and a counter contour of the other connecting element is accommodated in sections in an attachment position by the recess. The recess is formed by wall elements, which run angularly to each other. An independent claim is also included for a method for manufacturing a connecting arrangement.

Description

The invention relates to a connection arrangement according to the preamble of patent claim 1 and to a method for producing such a connection arrangement according to the preamble of claim 10.

Such connection arrangements are well known. So revealed the DE 42 31 320 C2 a device for detachably connecting at least two objects by means of a pin arranged on the first object and a receptacle arranged on the second object, wherein at least part of the peripheral surface of the pin in the circumferential direction at least one cam in the form of splines and the recording in the circumferential direction of a Cam has corresponding number of grooves in the form of splines. The back surfaces of the cams and the grooves of the grooves essentially follow the course of a logarithmic spiral with respect to the axis of the pin or the recording. When nesting the pin in the recording also a gap is present.

The DE 196 25 554 C2 discloses a method for connecting a shaft to at least one part arranged on the shaft, in which the part with threading play is threaded onto the shaft and fixed thereon in a certain position by releasing the joining play. At least the surface with which the part sits on the shaft, has a profile in the form of several, preferably at equal angles offset around the circumference, gradually on a cylindrical reference surface inwardly increasing and again sloping on the same curved wedge surfaces. In the method is also provided that first the joining play between the shaft and the part is released and then the part is rotated at a fixed shaft for further fastening in the intended position.

From the DE 195 27 602 A1 a device for fixing objects is known, consisting of a bolt and a sleeve-shaped clamping part, wherein at least a part of the lateral surface of the bolt in the circumferential direction at least one cam in the form of splines and the clamping member in the circumferential direction corresponding to the number of cam grooves deepening having in the form of splines. The back surfaces of the cams and the wedge surfaces of the grooves substantially follow the course of a spiral, and there is a gap between cams and grooves for nesting the bolt and the clamping member. The splines of the cams of the bolt and the grooves of the clamping part are arranged helically around a same pitch angle.

The DE 199 32 660 A1 describes a shaft-hub connection with a hub having on its inner wall a predetermined number of each increasing or decreasing in the circumferential direction in the circumferential direction increasing or decreasing Innenwandungsteilbereiche, with a shank on its outer wall a predetermined number of each at a distance from one Shaft axis in the circumferential direction increasing or decreasing Außenwandungsteilbereiche, wherein the shaft is inserted into the hub and by a rotation between the shaft and hub between each of said outer wall portions of the shaft and each one of said inner wall portions of the hub, a predetermined adhesion is generated.

The shaft is at least on its outer wall and / or the hub is at least on its inner wall of a material that shows a plastic deformation behavior at the given adhesion. In addition, the inner wall of the hub and / or the outer wall of the shaft at least one of its Innenwandungsteilbereiche at least one indentation or opening.

The DE 101 44 034 A1 discloses a lock nut having a nut body and a rotatably mounted on the nut body clamping ring, wherein the clamping ring is pushed onto a neck of the nut body and fixed by clamping. The inner surface of the clamping ring has two grooves in the form of circular wedges, which extend over the entire winding range of 360 °. The outer surface of the neck has the same number of cams in the form of circular profiles extending over an angular range of less than 360 °.

The known devices all have the disadvantage that large tolerances in the axial direction are possible during assembly.

It is therefore an object of the present invention to develop a connection arrangement of the type mentioned in such a way that a more accurate installation is possible.

This object is achieved by a connection arrangement having the features of patent claim 1 and by a method for producing such a connection arrangement having the features of patent claim 10.

A connection arrangement according to the invention with a first connecting element and with a second connecting element, by means of which the first connecting element is at least partially receivable, wherein the connecting elements by a radial strain in at least one connection region of the connecting elements as a result of rotation from a mounting position in a mounting position of one of the connecting elements relative to the other of the connecting elements are connected, characterized in that in the connecting region of the connecting elements at least one substantially in the circumferential direction of the one of the connecting elements at least partially circumferential recess, in particular a groove is formed, by means of which at least in the fastening position, a corresponding mating contour of the other of the connecting elements is at least partially receivable. This counter contour is for example also arranged in the connecting region of the other connecting element. By providing the recess and the mating contour a defined, axial positioning of the connecting elements to each other allows, whereby axial position tolerances of the connecting elements are mutually avoidable or can occur only in a very small frame.

This is accompanied by a particularly simple and quick installation while forming a fixed connection of the connecting elements as a result of the rotation of a connecting element relative to the other connecting element, whereby a mounting time and thus assembly costs of the connection arrangement are significantly reduced.

This means that in the mounting position of one of the connecting elements relative to the other of the connecting elements, these are simply vorverbindbar by an existing joining game, for example, plugged into each other, and that in a defined, axial position. Upon rotation of a connecting element relative to the other connecting element from the mounting position into the fastening position of this joining game is repealed, and the connecting elements are rotatably and firmly clamped in the axial direction with each other in the radial direction of the connecting elements.

It should be noted at this point that the term refers axially to the direction of connection of the two connecting elements.

The said joining play should be increased by a measure of the described counter contour, so that one connecting element can be received by the other in the assembly position, after which the rotation can take place for the fixed connection of the connecting elements. As a result of the rotation is then after a certain angular amount of the mating contour on the corresponding recess. Upon further rotation, the radial strain and thus the firm connection.

Another advantage of the connection arrangement according to the invention is that through the recess and the corresponding mating contour an axial stop and thus a positive connection between the connecting elements in the axial direction, ie in the connecting direction, created, whereby forces in the axial direction over just this form fit are transferable. In a conventional radial bracing is a force / friction between the connecting elements, wherein transverse pressing forces of this type of connection must secure the connecting elements against relative rotation to each other as in particular against axial displacement to each other. For this purpose, relatively high transverse forces and thus high forces or moments to form such a connection are necessary.

The invention now has the advantage that due to the possibility of transmission of axial forces on the positive locking lower Querpresskräfte between the connecting elements must be provided to secure the connecting elements in the axial direction against a relative movement to each other. The forces in the axial direction can be absorbed by the form fit, wherein a main task of the force / friction fit, so the radial tension of the connecting elements of the connection assembly according to the invention is to prevent loosening of the connection assembly. As a result, lower forces or moments for connecting the connecting elements of the connection arrangement according to the invention are needed than would be the case without the recess according to the invention and the mating contour while ensuring avoidance of the relative movement of the connecting elements, in particular in the axial direction.

In an advantageous embodiment of the invention, the at least one recess is formed by at least two wall elements which extend at an angle to each other. Accordingly, the corresponding mating contour can also be formed by at least two wall elements, which run at an angle to one another and enclose a counter angle corresponding to an angle of the wall elements of the recess. This design of the recess allows a self-centering of the recess and the mating contour and thus of the connecting elements to each other, in which the connecting elements occupy a defined and virtually tolerance-free desired position to each other. By this self-centering also last, remaining position tolerances, as would be the case, for example, with recesses with a rectangular cross-section, whereby a high-precision, axial alignment of the connecting elements to each other is possible. Such a defined positioning can Especially in connection with an internal combustion engine, in particular in connection with an injection system of the internal combustion engine, be very important, since this is a fuel or injection valves or the like consumption, emissions and / or efficiency influencing. Thus, for example, it may be provided that the at least one recess has a substantially conical shape in its cross section, and therefore the corresponding mating contour is also substantially conical in its cross section.

It is also possible that the recess has in its cross-section any geometric shape, that is, a shape other than the straight-line conical shape. It may, for example, be radius-shaped in its cross-section.

Moreover, it is possible that the wall elements enclosing an angle of the recess with respect to a plane which is perpendicular to the connecting direction of the connecting elements and in which an optionally imaginary point of intersection of the wall elements is asymmetrical to each other. This means that an angle enclosed by a wall element with the plane is different from an angle enclosed by the plane and the other wall element. This cross-sectional shape then differs from the symmetrical with respect to the plane described V-shape of the conical recess, which of course is also possible.

Already brings a recess according to the invention the advantages described with it, so nevertheless a random plurality of such recesses may be provided, for example, to accommodate even greater forces.

If an amount of the angle enclosed by the wall elements of the recess lies in an angle range of exclusively 0 ° to exclusively 180 °, this is advantageous insofar as the exact, defined positioning is possible when setting a corresponding tightening torque, ie a torque which is necessary to allow a firm connection between the connecting elements. A larger opening angle means a higher angle of rotation of a connecting element relative to the other connecting element until the same degree of tension is present as at a smaller opening angle of the recess. A particularly advantageous angular range extends from 60 ° to 120 ° inclusive.

The amount of the angle is advantageously substantially 120 °, since this is a very good compromise from the necessary angle of rotation and radial clamping of the connecting elements.

The rotation of a connecting element relative to the other thus initially moves a repeal of the joining game, whereupon the counter contour and the recess come into operative connection. When setting the radial tension, ie on further rotation, are in the circumferential direction of the connecting elements only portions of the corresponding lateral surfaces, which is extremely advantageous in that is given by this only regional concerns a larger elastic deformation of the corresponding areas of the connecting elements. Similar to screws, a certain set amount can be compensated by this elastic deformation, for example due to thermal expansions. As a result of this elastic deformation of the connecting elements, despite the setting amount, a fixed connection of the connecting elements is given, which means a long service life for the connection arrangement. The smaller the areas that are operatively connected in the connection of the connecting elements, the higher the elastic deformation and the higher the set amount, which is thereby compensated.

If an exact axial positioning of the connecting elements relative to each other when the connecting elements are moved into the fastening position is made possible by the recess and by the corresponding mating contour, a particularly advantageous embodiment contributes to further simplify the assembly of the connecting elements and thus to make them less expensive. In this embodiment, the second connecting element in the connecting direction of the connecting elements has a stop on which the first connecting element can be supported at least in the assembly position.

This means that an installer introduces the first connecting element into the second connecting element, namely until such time as a corresponding end face of the first connecting element bears against the abovementioned stop. This stop is arranged to the recess according to the invention or the counter contour according to the invention such that upon rotation of a connecting element relative to the other connecting element, the counter contour and the recess can form an operative connection.

To avoid a double fit can then be advantageously provided that the self-centering in the form of the substantially conical shape of the recess the Front side of the first connecting element of the stop of the second connecting element lifts by a certain amount, which is for example in the range of a few tenths of a millimeter. So that is not only the axial positioning of the connecting elements to each other in the mounting position but also already given in the mounting position. The final, defined axial positioning relative to each other then takes place by rotation of one connecting element relative to the other. The two positions, ie the position defined by the stop and the final mounting position of the connecting elements do not necessarily have to be different from one another. Namely, the end face of the first connecting element does not necessarily have to lift off from the stop of the second connecting element. This is for example the case when the groove is not conical in cross-section, but for example rectangular or the like. To avoid a double fit and to avoid increased assembly forces, however, such a centering and thus such a lifting of the end face of the stop are advantageous.

It should be noted at this point that the stop is advantageously formed on an end face of the second connecting element and a corresponding end face of the first connecting element can be supported thereon. Likewise, however, it can be provided that the stopper is otherwise formed.

An advantageous embodiment of the invention provides for easy connection of the connecting elements as a result of rotation of the one connecting element relative to the other connecting element, that the connecting elements are connected in the connecting region via a circular spline connection or are also connected in the attachment position. This means that at least one circular wedge of the circular wedge connection is formed on an outer circumferential surface of the first and at least one corresponding circular wedge on an inner circumferential surface of the second connecting element. By means of such a circular wedge connection a solid, positive and non-positive connection between the connecting elements in a rapid manner can be formed, which keeps the assembly time and thus the installation costs in a small frame. It can be provided, for example, that each three circular wedges are arranged symmetrically in the circumferential direction of the respective connecting element, which allow in the mounting position a simple joining with a joining game and in the mounting position a firm connection.

The circular wedges essentially follow, as is known, a logarithmic spiral.

If the second connecting element is formed substantially sleeve-shaped at least in regions, this results in a simple and cost-effective producibility of both the second connecting element and the connecting arrangement as a whole, which keeps the overall costs of the connecting arrangement low.

The sleeve-shaped connecting element is for example a molded part with a substantially circular cylindrical outer contour, which is at least partially received by a housing and connected thereto, for example, a material fit.

Furthermore, it can be provided that the sleeve-shaped connecting element is connected via a flange to the housing. Thus, therefore, the housing has the connecting element.

Nevertheless, it is also possible for the corresponding connecting element according to the invention, which cooperates with a corresponding other connecting element, to be formed in such a housing itself.

The invention also relates to a method for producing a connection arrangement with a first connection element and with a second connection element, by means of which the first connection element is at least partially receivable, wherein the connection elements by a radial strain in at least one connection region of the connecting elements as a result of rotation from a mounting position in a fastening position of one of the connecting elements relative to the other of the connecting elements are connected and wherein according to the invention in a first step in the connecting region of the connecting elements at least one substantially circumferentially of the one of the connecting elements at least partially circumferential recess, in particular a groove, is formed. In a second step, a corresponding to the recess counter-contour is formed in the connecting region of the other connecting element, which is accommodated at least in the fastening position by means of the recess. Advantageous embodiments of the connection arrangement according to the invention are to be regarded as advantageous embodiments of the method according to the invention and vice versa. By means of the method according to the invention, the advantages already described in connection with the connection arrangement according to the invention can be realized, according to which the connection elements are defined and can be positioned exactly axially relative to one another in a simple manner. This positioning can be done without additional aids and is by the rotation of a connecting element executable relative to the other connection element, which on the one hand minimizes tolerances and on the other hand assembly costs and overall costs for the connection arrangement can be reduced. Of course, the second step can also be carried out before the first step for realizing the method according to the invention.

Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawings. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or in the figures alone can be used not only in the respectively specified combination but also in other combinations or in isolation, without the scope of To leave invention.

The drawings show in:

1 a perspective view of a connection arrangement with a first connecting element and with a second connecting element, which are connected by a radial strain in three connecting portions of the connecting elements as a result of rotation from a mounting position into a mounting position of one of the two connecting elements relative to the other of the connecting elements, wherein in Connecting regions of one of the connecting elements are formed three circumferential grooves in the circumferential direction of the one of the connecting elements, are received by means of which in the mounting position corresponding counter contours of the other of the connecting elements and

2 a perspective view and a longitudinal sectional view of a high-pressure fuel pump of an internal combustion engine with a connection arrangement according to 1 ,

The 1 shows a connection arrangement 10 with a first connecting element 12 and with a second connecting element 14 , The first connection element 12 is by means of the second connecting element 14 in some areas. The connecting elements 12 and 14 are due to a radial strain in three connecting areas 16 . 18 and 20 due to rotation of the first connecting element 12 from an assembly position into a fastening position relative to the connecting element 14 connected. In the connection areas 16 . 18 and 20 of the connecting element 14 are circumferential grooves 22 . 24 and 26 formed, by means of which in the mounting position corresponding counter contours 28 . 30 and 32 ( 2 ) of the connecting element 12 are included.

The connection of the connecting elements 12 and 14 takes place such that in the assembled position of the connecting elements or of the connecting element 12 the connecting elements 12 and 14 as a result of a joining game are inserted into each other. The joining game is about a height of the counter-contours 28 . 30 and 32 extended so that the appropriate mating can take place. For fixed connection of the connecting elements 12 and 14 , So for the radial clamping of this, there is a rotation of the connecting element 12 according to a directional arrow 34 from its mounting position in its attachment position. Correspondingly, could also be a rotation of the connecting element 14 against the directional arrow 34 respectively.

As you can see, the fasteners are 12 and 14 in their connecting areas 16 . 18 , and 20 connected via a circular wedge connection with three circular wedges, which are symmetrical in the circumferential direction of the connecting elements 12 and 14 are arranged distributed. An interaction of the grooves 22 . 24 and 26 with the opposite contours 28 . 30 and 32 allows accurate axial (in the connection direction) positioning of the connecting elements 12 and 14 to each other.

In the 1 is a housing 15 indicated in which the connecting element 14 partially recorded. The housing 15 and the connecting element 14 are connected by a material connection.

A possible application of the connection arrangement 10 is in the 2 shown in which the use of the connection arrangement 10 in the context of a high-pressure fuel pump 36 is set forth.

As in the longitudinal section of 2 you can see the grooves 22 . 24 and 26 each formed by two wall elements which extend at an angle to each other. The wall elements each enclose an angle which is for example 120 °, whereby a defined, axial positioning of the connecting elements 12 and 14 according to a directional arrow 38 is realizable to each other. As with the example of the groove 22 explained below, the grooves point 22 . 24 and 26 a symmetrical V-profile. The example of the groove 22 this means that the the groove 22 forming wall elements with respect to a plane 46 perpendicular to the direction of connection of the connecting elements 12 and 14 according to the directional arrow 38 and thus perpendicular to a longitudinal axis 44 the connection arrangement 10 runs and in which the intersection of the groove 22 forming wall elements is symmetrical. The one wall element closes with the plane 46 an equal angle as the other wall element with the plane 46 , Nevertheless, one to the in 2 alternative embodiment of the groove 22 or the grooves 22 . 24 and 26 possible, for example, according to which a wall element makes an angle with the plane 46 which is different from an angle of the plane 46 and the other wall element of the corresponding groove is enclosed.

To further simplify the assembly, the connecting element 14 a stop 40 on, in which in the mounting position a corresponding end face 42 of the connecting element 12 is applied. Upon rotation of the connecting element 12 according to the directional arrow 34 in the attachment position takes place through the conical grooves 22 . 24 and 26 a self-centering of the connecting element 12 opposite the connecting element 14 , whereby the front side 42 from the stop 40 lifts slightly to avoid excessive assembly forces and a double fit.

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 4231320 C2 [0002]
• DE 19625554 C2 [0003]
• DE 19527602 A1 [0004]
• DE 19932660 A1 [0005]
• DE 10144034 A1 [0007]

Claims (10)

Connection arrangement ( 10 ) with a first connecting element ( 12 ) and with a second connecting element ( 14 ), by means of which the first connecting element ( 12 ) is at least partially receivable, wherein the connecting elements ( 12 . 14 ) by a radial strain in at least one connecting region ( 16 . 18 . 20 ) of the connecting elements ( 12 . 14 ) as a result of a rotation from an assembly position into an attachment position of one of the connecting elements ( 12 . 14 ) relative to the other of the connecting element ( 12 . 14 ) are connectable, characterized in that in the connection area ( 16 . 18 . 20 ) one of the connecting elements ( 12 . 14 ) at least one substantially in the circumferential direction of the one of the connecting elements ( 12 . 14 ) at least partially circumferential recess ( 22 . 24 . 26 ), in particular a groove ( 22 . 24 . 26 ), by means of which, at least in the fastening position, a corresponding mating contour ( 28 . 30 . 32 ) of the other of the connecting elements ( 12 . 14 ) is at least partially receivable. Connection arrangement ( 10 ) according to claim 1, characterized in that the recess ( 22 . 24 . 26 ) is formed by at least two wall elements which extend at an angle to each other. Connection arrangement ( 10 ) according to claim 2, characterized in that an amount of an angle α enclosed by the wall elements lies in a range of 0 ° <α <180 °. Connection arrangement ( 10 ) according to claim 3, characterized in that the opening angle α is substantially 120 °. Connection arrangement ( 10 ) according to one of the preceding claims, characterized in that the second connecting element ( 14 ) in the connection direction ( 38 ) of the connecting elements ( 12 . 14 ) a stop ( 40 ), on which the first connecting element ( 12 ) Can be supported at least in the mounting position. Connection arrangement ( 10 ) according to claim 5, characterized in that the stop ( 40 ) on an end face of the second connecting element ( 14 ) is trained. Connection arrangement ( 10 ) according to one of the preceding claims, characterized in that the connecting elements ( 12 . 14 ) in their connection area ( 16 . 18 . 20 ) are connectable via a circular wedge connection. Connection arrangement ( 10 ) according to claim 7, characterized in that the circular wedge connection has three circular wedges. Connection arrangement ( 10 ) according to one of the preceding claims, characterized in that the second connecting element ( 14 ) is formed at least partially substantially sleeve-shaped. Method for producing a connection arrangement ( 10 ) with a first connecting element ( 12 ) and with a second connecting element ( 14 ), by means of which the first connecting element ( 12 ) is at least partially receivable, wherein the connecting elements ( 12 . 14 ) by a radial strain in at least one connecting region ( 16 . 18 . 20 ) of the connecting elements ( 12 . 14 ) as a result of a rotation from an assembly position into an attachment position of one of the connecting elements ( 12 . 14 ) relative to the other of the connecting elements ( 12 . 14 ), characterized by the following steps: a) forming in the connection region ( 16 . 18 . 20 ) one of the connecting elements ( 12 . 14 ) at least one substantially in the circumferential direction of the one of the connecting elements ( 12 . 14 ) at least partially circumferential recess ( 22 . 24 . 26 ), in particular a groove ( 22 . 24 . 26 b) forming in the connection region ( 16 . 18 . 20 ) of the other of the connecting elements ( 12 . 14 ) one to the recess ( 22 . 24 . 26 ) corresponding counter contour ( 28 . 30 . 32 ), which at least in the attachment position by means of the recess ( 22 . 24 . 26 ) is receivable.

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