WO2019007859A1

WO2019007859A1 - Component, hollow shaft and method for producing a hollow shaft

Info

Publication number: WO2019007859A1
Application number: PCT/EP2018/067699
Authority: WO
Inventors: Ulf MÜLLER; Robert Reichelt
Original assignee: Thyssenkrupp Presta Teccenter Ag; Thyssenkrupp Ag
Priority date: 2017-07-04
Filing date: 2018-06-29
Publication date: 2019-01-10
Also published as: DE102017114907A1

Abstract

The invention relates to a component (10) for installation on or in a hollow shaft (11), comprising a base element (12) and a connecting element (13) which is connected or connectable to the base element (12) in a positively locking manner, wherein the connecting element (13) is adapted for frictional connection with an inner wall (14) of the hollow shaft (11). The invention further relates to a hollow shaft (11) and to a method for producing a hollow shaft (11).

Description

Component, hollow shaft and method for producing a hollow shaft

description

The invention relates to a component for a hollow shaft, a hollow shaft and a method for producing a hollow shaft.

Such components are known, for example, in the form of oil separators, which are installed in a cam hollow shaft in order to purify the blow-by gases produced in an internal combustion engine. The blowby gases are sucked into the cam hollow shaft, passed through the oil separator, cleaned and then discharged.

For cost and weight reasons Olabscheider are increasingly made of plastic. This raises the problem of a permanently fixed connection between the oil separator and the usually made of steel

Ensure camshaft. The component safety, i. the axial and radial interference fit of the oil separator in the cam hollow shaft, must for a

Temperature range between -40 ° C and + 150 ° C be given. The components must ensure on the one hand for these limit temperatures and on the other hand for all possible component pairings both the required tightness and compliance with the permissible material stresses. In addition, with built-in camshafts on the pipe inside diameter, a production-related intake due to the components to be joined, such as the cam, arises. The production-related intake can be up to 0.2 mm.

Due to the material combination plastic / steel, it is not possible or at least technically very difficult, a sufficiently large oversize

because the voltages required for the interference fit by the

Properties of the plastic used are degraded. Specifically, it can lead to the flow of the material and a plastic deformation that eliminates the required excess or the desired coverage. The

Olabscheider loses the tight seat and moves loosely in the camshaft.

Although it is known from DE 10 2012 017 040 AI to produce sintered composite components comprising a shaft and cam. As a result, the collection is avoided. The process is very complex. DE 10 2011 079 609 A1 describes a camshaft adjuster with a drive element, a Output element and a cover element, which are connected to each other positively or positively.

The invention is based on the object to provide a component for a hollow shaft, which can be securely and firmly connected to the hollow shaft as independent as possible of the respective material pairing. The invention is further based on the object to provide a hollow shaft and a method for producing a hollow shaft.

This object is achieved in view of the component by the

The subject of claim 1 solved. With regard to the hollow shaft, the object is achieved according to the invention by the subject matter of claim 12 and with regard to the method by the subject-matter of claim 15.

Specifically, the object is achieved by a component for mounting on or installing in a hollow shaft, wherein the component comprises a base member and a connecting element which is positively connected to the base member or positively connect. The connecting element is adapted for frictional connection with an inner wall of the hollow shaft.

The invention has the advantage that the previous direct connection between the base member and the hollow shaft by a connection by means of

Is replaced connecting element, which serves as an intermediate element between the base member and the hollow shaft. Thus, the base element can be made of a material that is tailored to the respective function of the basic element. The connecting element may be made of a different material, which is optimized with regard to the connection function. This results in a separation of functions, which allows an improvement in the connection between the component on the one hand and the camshaft or the hollow shaft on the other.

The positive connection between the primitive and the

Connecting element allows a largely material-independent

Connection. It is not necessary, different

Adjust thermal expansion properties of the components. Specifically, the base element made of plastic and the connecting element made of metal his. In general, the basic element and the connecting element can be made of different materials.

The positive connection fixed in the assembled state, the base member in the hollow shaft both in the axial direction along the longitudinal axis of the hollow shaft and in the circumferential direction in the hollow shaft.

The connecting element can be used for the non-positive connection with the

Hollow shaft optimally adapted. The optimization may relate to the choice of material and / or the shape of the connecting element.

In general, the invention leads to a cost reduction due to the elimination of positive locking geometries of the hollow shaft, in particular cam hollow shaft. The invention enables a permanently secure fixation of the component at

different operating temperatures in the hollow shaft, even if the different components have different thermal expansion coefficients. The assembly of the component comprising the base element and the

Connecting element, in the hollow shaft is also possible if the component is to be placed over axial areas of the hollow shaft away, where the

Inner diameter of the hollow shaft is retracted radially inward, eg. In a built cam hollow shaft.

The invention is particularly suitable for connecting a base element, which may be a separator, in particular an oil separator, through the connecting element to a hollow shaft, in particular a cam hollow shaft. The

Basic element can be made of plastic. The connecting element connects the base element with the camshaft in the assembled state non-positively. The basic element and the connecting element are positively connected.

The basic element is generally responsible for the functionality of the component. In the case of the separator, for example, the basic element is set up for the separating function.

The invention is not limited to a basic element as a separator. Basic elements of other types of functions can also be used. A component for installation is understood to mean a component in which the basic element is introduced into the hollow shaft. This may be the case, for example, with a baffle separator.

A component for mounting is understood to mean a component which, in the assembled state, is at least partially disposed on the end face of the hollow shaft, for example in a centrifugal separator. Specifically, the basic element that is responsible for the functionality of the component, at least arranged on the end face. The connecting element is arranged in the hollow shaft and connects the base element frictionally with an inner wall of the hollow shaft. The basic element and the connecting element are positively connected.

In the context of the invention, an embodiment is claimed in which the

Connecting element and the base element, for example, before the final assembly as a separate, components to be joined are present. The connecting element and the base element are therefore positively connected.

In the assembled state, the connecting element and the base element form an independently manageable assembly, which is connected in a further assembly step with a hollow shaft.

Preferred embodiments of the invention are specified in the subclaims.

Thus, the component may include a liquid separator. This may be, for example, an oil separator.

The connecting element may have at least one holding means, which in a state connected to the base element over the outer circumference of the

Base element protrudes radially. This ensures that the holding means of the connecting element can produce the non-positive connection with the hollow shaft when the connecting element is inserted together with the base element or a part thereof in the hollow shaft. The basic element and the hollow shaft are therefore not in direct contact at least in

Related to the power transmission for the connection, so different thermal expansion coefficients in the case of different materials do not play a significant role.

Preferably, the holding means in the radial direction with respect to the

Basic element elastically deformable. This has the advantage that in the mounted state, that is, when the connecting element is arranged in the hollow shaft, exerted by the elastic deformation of the connecting element, a holding force on the inner wall of the hollow shaft and so the non-positive connection is established.

In a further preferred embodiment, the holding means is positively connected or connectable to the base element. The holding means has thus in connection with the embodiment described above

Dual function. On the one hand, the holding means provides the connection to

Basic element and on the other hand the connection to the hollow shaft ago. This is a particularly secure connection from the primitive over the

Connecting element to the hollow shaft created because the holding means by the frictional connection with the hollow shaft in the position for the

Positive connection is fixed.

It is alternatively conceivable to provide a plurality of different holding means, which provide either only for the frictional connection with the hollow shaft or only for the positive connection with the base element.

In general, it is advantageous if a plurality of holding means, for example 2, 3 or more than 3 holding means are provided, whereby the component safety is increased.

The holding means may comprise, for example, a bending tab. The bending tab is adapted to make the positive connection with the base element. Due to the elastic deformability of the bending tab is the adhesion with the

Hollow shaft possible in assembled state.

The connecting element may form a sheet-metal shaped part whose outer circumference corresponds in sections to the outer circumference of the basic element. This has the advantage that the connecting element in the axial direction of the hollow shaft or the basic element is flat. Moreover, the connecting element may be, for example, by punching or the like

Manufacturing process to be produced. In a further manufacturing step, the connecting element can be brought into the form required for the assembly with the basic element, for example by bending the

Holding means.

In a preferred embodiment, the connecting element

disc-shaped and the base element be tubular. Advantageously, a disk-shaped connecting element allows a space and

weight-saving design. The tubular design of the base element allows a maximum size in relation to the inner diameter of the hollow shaft and an associated optimal utilization of the

Hohlwelleninnraumes as a functional space.

The connecting element is preferably provided with an axial end of the

Connected or connect primitive. This position of the

Connecting element ensures that this is arranged sufficiently far inside the hollow shaft, so that a secure connection with the hollow shaft is possible.

In a particularly preferred embodiment, the base element has at least one means for removing a liquid.

In the further preferred embodiment, the basic element

Centering on the outer circumference for centering the base member in the hollow shaft. This avoids that the base element tilted when it is inserted in the final assembly in the hollow shaft.

Furthermore, a hollow shaft is claimed with a component according to the invention, wherein the connecting element is positively connected on the one hand with the base element and on the other hand with the inner wall of the hollow shaft. Due to the different types of connections on the one hand to the base element and on the other hand to the hollow shaft optimum component safety is achieved regardless of the respective material pairing element / hollow shaft. Preferably, the hollow shaft comprises a camshaft. The invention is not limited to cam hollow shafts, but can generally be used to connect components with hollow shafts in which materials with

different coefficients of thermal expansion are combined.

Preferably, the connecting element and the hollow shaft are made of the same materials. This is not mandatory. It is also possible to combine different materials with similar thermal expansion coefficients. If the elastic deformability of the connecting element is in the foreground, the choice of material can even be independent of the thermal component properties.

In the method according to the invention for producing a hollow shaft, a component which is designed according to the invention is introduced into the hollow shaft. Before introducing the base element and the connecting element are positively connected. When introducing the basic element and the

Connecting element in the hollow shaft, the connecting element is frictionally connected to the hollow shaft.

The invention will be explained in more detail below with reference to an embodiment with reference to the accompanying drawings with further details.

In this show

Fig. 1 is a plan view (right view) and a side view (left

Representation) of a connecting element of a component according to an embodiment of the invention;

Fig. 2 is a perspective view of a component according to a

Example embodiment according to the invention, for example, comprising a connecting element according to FIG. 1 and a base element before joining;

FIG. 3 shows a perspective view of the component according to FIG. 2 after joining; FIG.

4 shows a view of the component according to FIG. 3 from below; FIG. 5 shows a longitudinal section of the component according to FIG. 3; FIG. 6 shows the detail Z according to FIG. 5; FIG.

7 shows a longitudinal section through a hollow shaft, in particular a

Cam hollow shaft, and the component of FIG. 3 before joining and

Fig. 8 is a longitudinal section through the hollow shaft, in particular the

Cam hollow shaft, and the component of FIG. 3 after joining.

FIGS. 1 to 8 show a component 10 according to the invention

Embodiment shown, in which case the basic element 12 as

Impact separator is executed. Other components to be mounted in or on a hollow shaft 11, in particular a cam hollow shaft, are possible.

In contrast to the prior art, here an additional element is used, namely the connecting element 13, which is shown in FIG. Together with the base element 12, which is responsible for the function (here: separation function), the connecting element 13 forms a component, as shown in FIG. 2 (not mounted) and FIG. 3 (mounted).

The connecting element 13 is produced as a stamped and bent part and forms a sheet-metal shaped part, in particular a flat or disk-shaped sheet metal shaped part. The connecting element 13 has a base plate 18 whose outline in

Substantially corresponds to the outline of the base member 12 of FIG. 2. The basic shape of the connecting element 13 is designed so that it can be inserted into the hollow shaft 11 shown by way of example in FIG. 7. Other

Geometries of the connecting element 13 are possible. The base plate has openings 23.

The connecting element 13 has a plurality of holding means 15. Specifically, three holding means 15 are provided. Another number of holding means 15 is possible. The holding means 15 are arranged distributed on the outer circumference of the base plate 18. The holding means 15 each have an opening 19, in the assembled state with the base member 12, the positive connection is to be established. Specifically, the holding means 15 are each formed as bending tabs that are easily manufactured by a stamping process. As in Fig. 1, left

Shown, the bending tabs or generally the holding means are brought into a pre-assembly, so that after joining with the

Basic element 12 with this form fit.

The bending tab or generally the holding means 15 of the connecting element 13 are arranged, in particular only so far bent, that the maximum outer diameter D _{a of} the connecting element 13 formed thereby is greater than the inner diameter D, the bore of the hollow shaft 11. Specifically, the outer diameter D _a may be larger than the inner diameter Di by about 0.5 mm to 2 mm. During the joining operation with the hollow shaft 11, the bending tabs are bent inward, ie radially towards the central axis of the base element 12, thereby accepting the inner diameter D, of the hollow shaft 11 and thus obtaining a bending stress. The bending stress acts on the edges 21 of the bending tab or holding means 15. As a result, a force between the edges 21 and the

Inner wall 14 of the hollow shaft 11 is generated.

The elastic deformation of the holding means 15 and the bending tab is shown in Fig. 1, left representation on the one hand by the bending angle α and on the other hand by the Vorspannweg s by which the holding means 15 is moved during joining. With permanent design of the Vorspannweges s the bias is maintained. It is a deformation in the elastic range. Thereby, the interference fit of the component 10 comprising the base member 12 and the

Connecting element 13 is achieved in the hollow shaft 11 over its lifetime.

The basic element 12 can be clearly seen in FIG. 2 and in section in FIG. 5. The base element 12 is a plastic component. Other materials are possible. The choice of material depends on the functionality of the base element 12. In the example according to FIG. 2, which is a baffle separator, the plastic is selected correspondingly with a view to the separator function.

The base member 12 is formed substantially tubular or hollow cylindrical. The outer geometry of the base member 12 is adapted so that this can be inserted into the hollow shaft 11. At least one means 16, advantageously a plurality of means 16, for removing a liquid is formed on the inside of the base element 12. In the example according to FIG. 2, this is a helical inner profile which conducts separated oil through the base element 12 in the direction of an outlet 24 of the hollow shaft 11. The outlet 24 can be formed, for example, by an open, axial end of the hollow shaft 11. Other types of separators are possible.

At the axially rearward end of the base element 12 in the flow direction are a plurality of form-fitting elements 20, in particular at least three

Form-fitting elements 20, formed whose position with the position of

Holding means 15 matches. As can be seen in Fig. 3 are the

Form-fitting elements 20 star-shaped, in particular uniformly star-shaped, arranged in the circumferential direction of the base member 12. The form-fitting elements 20 engage in the assembled state in the respective holding elements 15 and

Bending tabs. This can be seen for example in Fig. 4 and particularly well in Figures 5 and 6. As shown in the detail view according to FIG. 6, the form-fitting elements 20 form a projection which engages in the opening 19 of the holding means 15. The form-fitting elements 20 are each rectangular in cross-section. They have at the holding means 15 side facing a flattening. On the back of the form-fitting elements 20 is in each case a groove-shaped

Recess formed perpendicular to the axial longitudinal axis of the base member 12. The holding means 15 can, as shown in Fig. 6, that

Positive locking element 20 engage behind, so that a fixing of the base member 12 takes place both in the axial direction of the base member 12 and in the circumferential direction of the base member 12. Other geometries of the form-locking element 20 are possible.

The base element 12 has on the outer circumference a plurality of radially projecting beyond the outer wall of the base member 12 centering means 17. The centering means 17 are arranged distributed on the circumference and in the longitudinal direction of the base member 12. The centering means 17 serve to prevent tilting of the base member 12 during insertion into the hollow shaft 11. This ensures that all edges 21 of the holding means 15 and the bending tab are uniformly deformed by the contact of the inner wall 14 of the hollow shaft 11. The assembly of the component 10 in the hollow shaft 11 takes place in 2 steps. In the first step, as shown in Figures 2 and 3, the base member 12 and the connecting element 13 are joined. For this purpose, the connecting element 13 is placed on the end face of the base element 12, that is, on the axial rear end face in the flow direction of the blow-by gas. The pre-bent retaining means 15 are bent further in the radial direction inwards, so that they

Engage behind positive engagement elements 20. As a result, the component 10 is produced from the base element 12 and the connecting element 13, which are connected in a form-fitting manner.

In the second assembly step, the component 10 is connected to the hollow shaft 11 (FIGS. 7, 8). As shown in Fig. 7, the component 10 is aligned coaxially with the hollow shaft 11 and pressed according to the drawn in Fig. 7 joining direction in the hollow shaft 11 to. The final state is shown in FIG. In this state, the holding means 15 form a frictional connection with the inner wall 14 of the hollow shaft 11. At the same time the positive connection between the connecting element 13 and the base member 12 is secured by the contact with the inner wall 14.

It is generally possible to change the number of bending tabs now. The thickness of the sheet metal part can also be varied. The positive-locking element 20 on the base element 12 or the counterpart, i. the holding means 15 of the

Connecting element 13 can be varied. The bending angle α of

Holding means 15 in the relaxed state may vary. The same applies to the degree of coverage, i. the position in the holding means 15 in the relaxed state based on the inner diameter of the hollow shaft eleventh

The sheet metal part is conceivable as an insert in injection mold.

In general, therefore, the connecting element 13 may be designed as a plastic part, in which a positive connection with the base member 12 on the one hand and a frictional connection with the hollow shaft 11 on the other hand is possible.

Different thermal expansions between the connecting element 13 and the material of the hollow shaft 11 are possible as long as the bias in the holding means 15 or bending tabs to the hollow shaft tube in all operating points is maintained and the deformation of the holding means 15 or bending tab takes place in the elastic region.

LIST OF REFERENCE NUMBERS

10 component

11 hollow shaft

12 basic element

13 connecting element

14 inner wall

15 holding means (bending tab)

16 means for removing a liquid

17 Centering

18 base plate

19 Opening of the holding means

20 positive locking element

21 edges

22 cams

23 openings

24 outlet

D _a maximum outer diameter of the connecting element

D | Inner diameter of the bore of the hollow shaft

s bias path

α bending angle

Claims

claims

1. component (10) for attachment to or installation in a hollow shaft (11)

comprising a base element (12) and a connecting element (13) which is positively connected to the base element (12) or to be positively connected, wherein the connecting element (13) is adapted for non-positive connection with an inner wall (14) of the hollow shaft (11) ,

2. Component according to claim 1

dad u rch nets that net

the component comprises a liquid separator.

3. Component according to claim 1 or 2

dad u rch nets that net

the connecting element (13) has at least one retaining means (15) which projects radially beyond the outer circumference of the base element (12) in a state connected to the base element (12).

4. Component according to claim 3

dad u rch nets that net

the holding means (15) in the radial direction relative to the base element (12) is elastically deformable.

5. Component according to claim 3 or 4

dad u rch nets that net

the holding means (15) is positively connected to the base member (12) or to be positively connected to the base member (12).

6. Component according to one of claims 3 to 5

dad u rch nets that net

the holding means (15) comprises a bending tab.

7. Component according to one of the preceding claims

dad u rch nets that net

the connecting element (13) forms a sheet metal part, the

Outer circumference at least partially coincides with the outer circumference of the base member (12).

8. Component according to one of the preceding claims

dad u rch nets that net

the connecting element (13) disc-shaped and the base element (12) is tubular.

9. Component according to one of the preceding claims

dad u rch nets that net

the connecting element (13) is connected or to be connected to an axial end of the base element (12).

10. Component according to one of the preceding claims

dad u rch nets that net

the base element (12) has at least one means (16) for removing a liquid.

11. Component according to one of the preceding claims

dad u rch nets that net

the base element (12) has at least one centering means (17) on the outer circumference for centering the base element (12) in the hollow shaft (11).

12. hollow shaft (11) with a component (10) according to one of the preceding claims, wherein the connecting element (13) on the one hand with the base element (12) positively and on the other hand with the inner wall (14) of the hollow shaft (11) is non-positively connected.

13. Hollow shaft according to claim 12

dad u rch nets that net

the hollow shaft (11) comprises a camshaft.

14. Hollow shaft according to claim 12 or 13

dad u rch nets that net

the connecting element (13) and the hollow shaft (11) are made of the same materials. Method for producing a hollow shaft, in which a component (10) according to one of claims 1 to 11 is introduced into the hollow shaft (11), the base element (12) and the connecting element (13) being inserted into the hollow shaft (11). are positively connected and the connecting element (13) and the hollow shaft (11) during insertion of the base member (12) and the connecting element (13) in the hollow shaft (11) are non-positively connected.