Moreover, an embodiment according to Claim 2 is advantageous. Thereby a
larger adhesive surface is obtained and loosening of the collar-shaped flange of the lock nut or respectively of the stud bolt is prevented even when the stud bolt is subjected to bending stresses.
However, also by a further embodiment according to Claim 3 as a result of the filling of the interior of the stud bolt with the material of the supporting body the tearing strength and stability of the latter are increased in the same way as in a sandwich structure.
Furthermore, the invention covers a component as described in the generic term of Claim 4. This component according to Claim 4 has an enlarged outer surface, in particular as lock nut, whereby a greater retention force or tearing strength with respect to the supporting body is achieved.
An independ ent component according to the generic term of Claim 5, which is characterized by the features in Claim -5 is also advantageous, because through the use of this component the interior of the latter, for a frictional connection, can be con nected to the supporting body by forming on, thereby achieving greater resistance to tearing of the component in connection with a supporting body made of plastics. Such a stud bolt may, however, also have increased strength as compared with hollow parts through filling out the interior with a plastics material, because said stud bolt then forms a sandwich structure.
By the embodiment according to Claim 6 a larger cross-sectional area is ob tained for the bond between the supporting body and the component.
The production of the stud bolt free of shrinkage cavities and filling of the same, in order to strengthen it, can be achieved in particular by the further development according to Claim 7.
Through the variant of an embodiment according to Claim 8, a better fixing of the stud bolt in the supporting body is obtained.
A variant of an embodiment according to Claim 9 is also advantageous, however, because thereby a non-chip production of the threads is achieved. whereby the subsequent fastening procedure cannot be adversely affected by these chips.
A 154 is An embodiment according to Claim10 is advantageous, because thereby it is possible to obtain an even better anchoring of the lock nut or respectively the stud bolt in the supporting body.
By the further development according to Claim 11 a larger cross-sectional area is obtained for anchoring the lock nut or respectively the stud bolt in the supporting body.
A variant of an embodiment according to Claim 12 enables improved anchoring of the component inside the supporting body.
Finally, a method as shown in the generic term of Claim 13 is also advantageous, 0 which is characterized by the measures in Claim 133. It is advantageous to produce the spatially separate components in large numbers from flat materials by press-forming and/or deepdrawing processes, whereby manufacturing costs are low in spite of high strength.
The invention is explained hereinafter in further detail by means of the different forms of embodiment shown in the example embodiments, in which:
Fig. 1 is a simplified, diagrammatic representation and a side view, partially in section, of a damping device in accordance with the invention to attain a vibration- damping mounting of a device on a supporting structure., Fig. 2 Fig. 3 Fig. 4 Fig. 5 is a side view, in section and on a larger scale, of the damping device in accordance with the invention shown in Fig. 1; is a side view, in half section. of a component in accordance with the invention formed by a lock nut according to Fig. 2, after the first production step; is a side view, in half section, of the lock nut according to Fig. 2 or respectively 3 after carrying out the second forming step, is a side view, in half section, of the lock nut according to Figs. 2 to 4 after carrrying out the third process step Fig. 6 is a side view, in half section, of the lock nut according to Figs. 2 to 5 in the finished condition; A 15 Fig. 7 is a side view, in half section. of another embodiment of a component in accordance with the invention, formed by the lock nut, having a surrounding collar arranged on the flange., Fig. 8 is a side view, in half section. of another variant embodiment of a component in accordance with the invention, namely a stud bolt having a surrounding collar arranged on the flange.
Fig. 1 shows a damping device I comprising a supporting body 2 made of plastic material and/or rubber, in particular a vibration-damping material. 'llie supporting body 2 may also be designed as a sandwich structure or a multi-layered structural component. As compo nents in the supporting body 2, there are arranged a locking nut 3 formed in and a stud bolt 4 formed on. The stud bolt 4 traverses a supporting part 5 of a supporting frame and is fastened on this supporting part 5 by means of a screw nut 6 with an inserted washer 7.
The opposite side of the supporting body 2 is connected to an oscillator, for exam- ple an electromotor 8. 111e connection is performed by a screw 9 traversing a receiving bore of the electromotor 8 or respectively the casing thereof and being screwed into place in the lock nut 3.
As can better be seen in Fig. 2, the lock nut 3 is formed into the supporting body 1 such that a flange 11 projecting beyond a cylindrical extension 10 is supported on a front face 12 of the supporting body 2, projects beyond the latter and is connected to the latter by forming on, for example in the production of the supporting body 2, through the inherent adhesive and bonding properties of the plastic material or respectively the rubber.
Subsequently to the cylindrical extension 10, at the front end 13 opposite the flange 11, which end is closed by a front wall 14, there is arranged an expansion 15 which gives the lock nut 3 a mushroom-shaped appearance.
Between this expansion 15 and the collar-shaped flange 11 an internal thread 17 is tapped into an inside wall 16. Instead of tapping the internal thread 17, for example by means of a tap or the like, it is of course also possible, to form the internal thread 17 chipless. This has the advantage that in producing it no chips will remain inside the lock nut which during scre wing in of a screw 9 may cause A 15M/94 The construction of the lock nut 3 in the region of a front side 18 with the surroun- ding flange 11 projecting beyond the cylindrical extension 10, and the expansion 15 in the region of the front end 13, causes the material which forms the supporting body 2 to cling to the space or respectively hollow space formed thereby, thus improving the tearing strength of the lock nut 3. In particular, a higher resistance is offered to an extraction force in the direction of an arrow 19. This resistance against tearing is additionally increased, because by the expansion an enlarged outer surface is created for the locking nut 3, which, with its surrounding cylin drical outer surface 20 of the cylindrical extension 10, is adhesively connectd to the material of the supporting body 2, that is the rubber or respectively plastics material, by means of the ex pansion 15 as well as by means of the outside of the front wall 14.
Independently thereof and, in particular, in combination with the above described lock nut 3, the use of a stud bolt 4 is also advantageous, however. This stud bolt 4 is likewise produced by deep drawing from a flat component and projects with its front end 22, which is closed by a front wall 21, beyond a front face 23 of the supporting body 2 or respectively be yond a surrounding flange 25 arranged in the region of the oppositely situated front side 24. In the region between the flange 25 and the front end 22 opposite the latter a cylindrical extension 26 is provided. An external thread 28 is cut, rolled or respectively formed chipless on the cylin drical outer surface 27 of said extension. In the example embodiment shown, the surrounding flange 25 is, furthermore, embedded in the front face 23 so as to be flush with the latter.
The surrounding flange 25 could of course also be attached to the front face 23, as is the case with the flange 11 on the front face 12.
It is advantageous in this form of embodiment of the stud bolt 4 that through the production by a deep-drawing process an open hollow- or respectively interior space 29 is crea ted which extends over the entire cylindrical extension 26 as far as the front wall 21, which provides a substantially larger surface for a frictional connection of the stud bolt 4 with the sup porting body 2 than is provided for known stud bolts made of solid material. In this way, the tearing strength can be increased, while there is at the same time a saving in material and lower weight of the component. In order to ensure complete filling of the interior space 29 of the stud bolt 4, it is advantageous, if an air outlet opening 30 is arranged, for example in the front wa.11 21, having a diameter 31 dimensioned so as to enable the air to escape, but to prevent on the other hand the liquid plastic material or respectively rubber from passing through. Consequent ly, the building up of an air pocket is reliably prevented.
For better fixing of both the stud bolt 4 and the lock nut 3 in the supporting body 2, A IW194 perforations 32 can be provided in the flanges 25 or respectively 11, as indicated schematically by broken lines, so that the adhesive surface between a rubber and respectively plastics material 33 of the supporting body 2 and the lock nut 3 or respectively the stud bolt 4 can be extended.
This is otherwise obtained also by means of the expansion 15 which preferably has at the same time a greater inner width of opening 34 or respectively a greater inside diameter than a nominal diameter 35 of the internal thread 17. Through this it is ensured that the internal thread 17 ends in the region of the expansion 15, and thus a perfect thread is provided for scre wing in a screw right down to the end position. Simultaneously, by widening this expansion 15 it is achieved that its outside diameter 36 is greater than an outside diameter 37 of the cylindri cal flange 10. This also ensures that a total length 38 is greater than an effective length 39 of the internal thread 17.
In Figs. 3 to 6 the production of the lock nut 3 is shown and the method of produc tion of this lock nut 3 is explained hereinafter in further detail by means of these figures.
As shown in Fig. 3, a flat-surfaced blank or a sheet-metal strip 40, for example, is prepared for producing this lock nut 3. By means of a punch 41, schematically shown by thin broken lines, the sheet-metal strip 40 is deep drawn in a female die 42, which forms the coun terpart. During this process, the cylindrical extension 10 is formed, which is closed by the front wall 14 on the side facing away from the flange 11.
Fig. 4 shows the result of the second production step, that is rough upsetting. Here, the punch 43 is introduced into the cylindrical extension 10 of the lock nut 3 3, which is inserted in a female die 44, such that there remains a distance 45 from the front wall 14 of the lock nut 3 and that the sheet-metal strip 40 is additionally pressed against the female die 44 situated be neath it. Subsequently, an end section 46 of the cylindrical extension 10, which is not enclosed by the punch 43 and the female die 44. is expanded to the outside diameter 36 by pressing a tool 47 against the front wall 14 in the direction of the sheet-metal strip 40.
The illustration in Fig. 5 presents a possibility of proceeding when calibrating the expansion 15 of the cylindrical extension 10. In this process sequence, the expansion 15 is given its final shape, using parallel to the longitudinal axis 48 of the lock nut 3 rotating profile rollers 49, 50.
Instead, it is also possible. however, to proceed such that solely the front wall 14 is pressed straight by introducing. a punch 51 - shown by broken lines -, in order to obtain the total A 1544E04 length 38 of the lock nut 3 specified in Fig. 2.
In the last production step but one, which is illustrated in Fig. 6, the internal thread 17 is formed. The production of this internal thread can likewise take place in different ways, using different tools 52. Ibis tool 52 thus can be a tap or a suitable tool 52 for chipless forming of the internal thread 17. As already explained hereinbefore, the bulged expansion 15 makes it possible that there exists a completely formed-out internal thread 17 over the total length 39, because by this bulged expansion 15 either the tap or respectively the tool 52 for chipless for ming of the internal thread 17 can be inserted into the interior of the lock nut 3 right down to the end position as far as the front wall 14.
In the last production step, as likewise shown schematically in Fig. 6, the cylindri- cal extension 10 is cut out from the sheet-metal strip 40 concentrically to the longitudinal axis 48 of the lock nut 3 with a punching tool 53, whereby the flange I I is given a circular or hexa gonal peripheral shape. and the production of the lock nut 3 is completed.
In the Figs. 7 and 8 it is furthermore shown that the flange 11 or respectively 25 of the lock nut 3 or respectively of the stud bolt 4 may be provided with a surrounding collar 54 arranged at an angle to the flange 11 or respectively 25. An adhesive surface between the lock nut 3 or respectively the stud bolt 4 and the plastics material of the supporting body 2 is increa sed thereby. An additional strengthening can be achieved, because this surrounding collar 54, as shown in the stud bolt 4, has an L-shaped cross-section, thereby allowing a further projection to be covered up in the supporting body 2 in a surrounding manner and thus enabling an increase in the supporting cross-sectional area of the supporting body 21.
This retention force or respectively tearing strength of the stud bolt 4, is for exam- ple also increased, as indicated schematically, by the fact that due to the deep drawing process used in the production of the stud bolt 4 the external walls are tapered through drawing and iro ning in the direction of the front wall 21, with the result that the interior space 29 is conically enlarged in the direction of the front wall 2-1.
Finally, for good order's sake it should be indicated that for a better understanding 0 of the invention the individual components are partially presented in a distorted manner. disproportionately and not to scale.
Each exemplary embodiment according to Figs. 1 to 8 can form its own embodiment in accordance with the invention. Likewise, individual features of the ciifferent exemplary A 1546M embodiments in combination with each other may form their own solutions in accordance with the invention.
In particular, the individual embodiments shown in Figs. 1; 2; 3 to 6; 7; 8 can form the object of own solutions in accordance with the invention. Relating tasks and solutions are apparent from the detailed descriptions of these figures.
A 1546/94 CLAIMS 1. Damping device with a supporting body of plastics and/or rubber, in which at least one component such as a thread nut and/or a stud bolt, in particular having an external thread, is formed onto a cylindrical outer surface or is recessed with a collar- shaped flange in a surface, wherein the thread nut is designed as deep drawn lock nut with an internal thread, and the stud bolt is produced as cap-like deep drawn part with the external thread, and wherein the lock nut and/or stud bolt are provided on a front side facing away from the closed front end of the cylin drical extension with a surrounding collar-shaped flange which projects beyond the outer surface and wherein the collar-shaped flange is connected to a front face of the supporting body or is formed onto the latter, and wherein the stud bolt and the lock nut in the region of its cylin drical extension are formed with an enlarged surface for the connection with the supporting body.