VIBRATION ABSORBER

Abstract

The present invention relates to a vibration absorber (10) for absorbing and/or damping vibrations of a vehicle part, comprising at least one mass element (12), at least one fastening element (14) for fastening the vibration absorber (10) to the vehicle part, at least one spring device (16) and at least one securing device (18) which captively connects the mass element (12) and the fastening element (14) to one another, wherein the spring device (16) is designed as at least one elastomeric shaped part (36) which is manufactured separately from the mass element (12) and the fastening element (14), and wherein the securing device (18) receives the elastomeric shaped part (36) to form at least one elastic mount unit (44) which elastically decouples the mass element (12) from the fastening element (14).

Claims

1. Vibration absorber (10) for absorbing and/or damping vibrations of a vehicle part, comprising at least one mass element (12), at least one fastening element (14) for fastening the vibration absorber (10) to the vehicle part, at least one spring device (16) and at least one securing device (18) which captively connects the mass element (12) and the fastening element (14) to one another, wherein the spring device (16) is designed as at least one elastomeric shaped part (36) which is manufactured separately from the mass element (12) and the fastening element (14), and wherein the securing device (18) receives the elastomeric shaped part (36) to form at least one elastic mount unit (44) which elastically decouples the mass element (12) from the fastening element (14).

2. Vibration absorber (10) according to claim 1, characterised in that the securing device (18) preloads the elastomeric shaped part (36) during assembly with the mass element (12).

3. Vibration absorber (10) according to claim 1 or 2, characterised in that the elastomeric shaped part (36) is connected in a positive and/or non-positive form-locking and/or force-locking manner to the securing device (18), the mass element (12) and/or the fastening element (14).

4. Vibration absorber (10) according to any one of the preceding claims, characterised in that the elastomeric shaped part (36) is designed in a ring shape.

5. Vibration absorber (10) according to any one of the preceding claims, characterised in that the elastomeric shaped part (36) has a circumferentially extending edge section (42) which is inserted into an opening (24) of the fastening element (14) in a form-locking and/or force-locking manner.

6. Vibration absorber (10) according to any one of the preceding claims, characterised in that the elastic mount unit (44) has two elastomeric shaped parts (36) between which the fastening element (14) is arranged.

7. Vibration absorber (10) according to any one of the preceding claims, characterised in that the securing device (18) is designed as a bolt (26) which extends together with the elastomeric shaped part (36) through an opening (24) of the fastening element (14), the bolt (26) being connected to the mass element (12) in a form-locking and/or force-locking manner.

8. Vibration absorber (10) according to claim 7, characterised in that the securing device (18) has a collar (32) which abuts against the spring device (16) and is designed as a stop on the fastening element (14).

9. Vibration absorber (10) according to claim 7 or 8, characterised in that the bolt (26) is provided with an external thread which is screwed into an internal thread of the mass element (12), or that the bolt (26) is provided with a profiling which is inserted into a hole (20) of the mass element (12).

10. Vibration absorber (10) according to any one of the preceding claims, characterised in that the fastening element (14) is designed as a retaining plate (22).

Description

[0026] In the following, vibration absorbers as well as other features and advantages are explained in detail by means of exemplary embodiments, which are shown schematically in the figures. Thereby,

[0027] FIG. 1 shows a perspective view of a vibration absorber according to a first embodiment in an unassembled condition;

[0028] FIG. 2 shows a cross section through the components of the vibration absorber shown in FIG. 1 along line II-II;

[0029] FIG. 3 shows a cross-section through the vibration absorber according to the first embodiment in the assembled state; and

[0030] FIG. 4 shows a perspective view of a vibration absorber according to a second embodiment in an unassembled condition.

[0031] FIGS. 1 to 3 show a vibration absorber 10 according to a first embodiment, which serves to absorb and/or damp the vibrations of a part of a vehicle not shown, in particular a transmission not shown.

[0032] The vibration absorber 10 has a mass element 12, a fastening element 14 for fastening the vibration absorber 10 to the part of the vehicle not shown, at least one spring device 16 made of elastomeric material and at least one securing device 18 which captively connects the mass element 12 and the fastening element 14 to one another.

[0033] The mass element 12 is made of metal and is cylindrical in shape. In the mass element 12, a hole 20 is drilled approximately in the middle, as can be seen in FIGS. 1 to 3.

[0034] The fastening element 14 is designed as an annular retaining plate 22 and has a central opening 24.

[0035] The securing device 18 is designed as a bolt 26, which has a first section 28 with a first diameter and a second section 30 with a second diameter. As can be seen in particular in FIGS. 2 and 3, the first diameter is larger than the second diameter.

[0036] At its end face, the first section 28 is provided with a collar 32, the outer diameter of which is larger than an inner diameter of the opening 24 of the retaining plate 22. The second section 30 is inserted into the hole 20 of the mass element 12 in order to connect the mass element 12 captively with the fastening element 14. For this purpose, the bolt 26 extends through the opening 24 of the retaining plate 22, so that the collar 32 is opposite the side of the fastening element 14 facing away from the mass element 12. In order to increase the form-locking and/or force-locking connection between the bolt 26 and the mass element 12, the second section 30 is provided with a profiling 34, which in this case is designed as a knurling.

[0037] Since the outer diameter of the collar 32 is larger than the opening 24 of the retaining plate 22, in case of damage or even destruction of the spring device 16, the collar 32 will abut against the retaining plate 22 so that a detachment of the mass element 12 from the vibration absorber 10 is prevented.

[0038] The spring device 16 has two elastomeric shaped parts 36 manufactured separately from the mass element 12 and the mounting element 14. Each of the elastomeric shaped parts 36 is annular in shape and has an annular body 38 with a passage 40 surrounded by a protruding circumferential edge section 42. The annular body 38 is also provided with a bevel 43 on the outer circumference.

[0039] As can be seen in particular in FIGS. 2 and 3, the passage 40 has a first inner diameter in the region of the annular body 38 and a second inner diameter in the region of the circumferential edge section 42, the second inner diameter being larger than the first inner diameter. The first inner diameter of the annular body 38 is smaller than the first diameter of the first section 28, so that the bolt 26 can receive the elastomeric shaped part 36 in a form-locking and/or force-locking manner or extend therethrough. Since the second inner diameter is larger than the first diameter of the first section 28, the circumferential edge section 42 is spaced from the bolt 26.

[0040] As can be seen in FIG. 2, an outer diameter of the circumferential edge section 42 is larger than the inner diameter of the opening 24. That is why the circumferential edge section 42 can be inserted or tied into the opening 24 of the retaining plate 22 in a form-locking and/or force-locking manner.

[0041] In the assembled state shown in FIG. 3, the bolt 36 and the elastomeric shaped parts 36 received in a form-locking and/or force-locking manner by the bolt 36 form an elastic mount unit 44 which elastically decouples the mass element 12 from the fastening element 14. For this purpose, the vibrations generated by the motor vehicle part are entered into the vibration absorber 10 via the fastening element 14. As a result, the mass element 12 starts to oscillate and the elastomeric shaped parts 36 damp the oscillations.

[0042] In the following, a possibility for mounting the vibration absorber 10 is explained. As can be seen in FIGS. 1 and 2, the retaining plate 22 is placed between the two elastomeric shaped parts 36. Then each of the elastomeric shaped parts 36 is inserted into the opening 24 by means of its circumferential edge section 42, so that the annular bodies 38 abut against the retaining plate 22. Then the bolt 26 is inserted, in particular pressed, into the passages 40 of the elastomeric shaped parts 36. Then the second section 30 with the profiling 34 is inserted, in particular pressed, into the hole 20 of the mass element 12 so that the collar 32 abuts against the elastomeric shaped part 36, in particular its annular body 38, and the elastomeric shaped parts 36 are thereby compressed and thus preloaded. This allows the damping characteristics of the vibration absorber 10 to be adjusted.

[0043] In the following a further exemplary embodiment of the vibration absorber 10 is described. The same reference signs are used for identical or functionally identical parts.

[0044] FIG. 4 shows a second version of the vibration absorber 10, which differs from the first embodiment in the contours of the mass element 12 and the fastening element 14 as well as in the use of four elastic mount units 44.

[0045] As can be seen in FIG. 4, each elastic mount unit 44 has a bolt 26 and two elastomeric shaped parts 36, wherein the elastomeric shaped parts 36 facing the mass element 12 can be inserted in a positive manner into recesses 46 of the mass element 12. Within each recess 46, a hole 20 is drilled. The bolts 26 are mounted to the mass element 12 as described above by inserting the second section 30 by means of its profiling 34 into the respective hole 20.

[0046] The vibration absorber 10 is characterised by the use of the elastomeric shaped parts 36 which are manufactured separately from the mass element 12 and the fastening element 14. This means that there is no need to coat the mass element 12 and the fastening element 14 with a binder. In addition, the elastic mount unit 44 formed from the elastomeric shaped parts 36 and the bolt 26 enables a mechanical flow of force where previously a chemical bond was used. This reduces the manufacturing costs of the vibration damper 10 and eliminates the need to preheat the mass element 12, which is necessary for scorching an elastomeric spring device. In addition, the vibration absorber 10 can be expanded modularly, since several elastic mount units 44 can be used independently of the contour of the mass element 12 and/or the fastening element 14. The use of the elastic mount unit 44 or several elastic mount units 44 thus opens up a modular solution, so that differently contoured and/or heavy mass elements 12 can be used. In addition, the securing device 18 combines the function of loss prevention and on an elastic mounting, so that the number of parts and thus the costs of the vibration absorber 10 are reduced.

LIST OF REFERENCE SIGNS

[0047] 10 vibration absorber [0048] 12 mass element [0049] 14 fastening element [0050] 16 spring device [0051] 18 securing device [0052] 20 hole [0053] 22 retainer plate [0054] 24 opening [0055] 26 bolt [0056] 28 first section [0057] 30 second section [0058] 32 collar [0059] 34 profiling [0060] 36 elastomeric shaped part [0061] 38 annular body [0062] 40 passage [0063] 42 circumferential edge section [0064] 43 bevel [0065] 44 elastic mount unit [0066] 46 recess