FASTENING SYSTEM FOR FASTENING A COMPONENT ON A CARRIER COMPONENT

Abstract

A fastening system for fastening a component on a carrier component, comprising a fastening bolt, which can be fitted through a component through-passage opening and can be fastened in a fastening bore of the carrier component, and an outer sleeve and an inner sleeve, which is mounted in an axially movable manner in a through-passage opening of the outer sleeve, wherein the inner sleeve forms a through-passage opening for the fastening bolt, the fastening bolt mounted in an axially movable manner in said through-passage opening, a first spring washer, which can be fitted onto the outer sleeve and positions itself against a first side of the component, and a second spring washer, which can be fitted onto the outer sleeve and positions itself against a second side of the component, said second side being located opposite the first side.

Claims

1. A fastening system for fastening a component (58) on a carrier component (62, 62) of a vehicle, comprising: a fastening bolt (10), which can be fitted through a component through-passage opening (60) and can be fastened in a fastening bore (64) of the carrier component (62, 62), and also an outer sleeve (14) and an inner sleeve (12), wherein the inner sleeve (12) is mounted in an axially moveable manner in a first through-passage opening (40) of the outer sleeve (14), wherein the inner sleeve (12) forms a second through-passage opening (32) for the fastening bolt (10), the fastening bolt (10) being mounted in an axially moveable manner in said second through-passage opening, and further comprising a first spring washer (16), which can be fitted onto the outer sleeve (14) and is designed so that, in a state in which the component is fastened on the carrier component (62, 62), the first spring washer positions itself against a first side of the component (58), and a second spring washer (18), which can be fitted onto the outer sleeve (14) and is designed so that, in the state in which the component is fastened on the carrier component (62, 62), the second spring washer positions itself against a second side of the component (58), said second side being located opposite the first side.

2. The fastening system as claimed in claim 1, wherein at least one of the outer sleeve (14) or the inner sleeve (12) absorbs compressive forces which occur during an operation of the fastening bolt (10) being fastened in the fastening bore.

3. The fastening system as claimed in claim 1, wherein the fastening bolt (10), the inner sleeve (12), the outer sleeve (14) and the first spring washer (16) can be connected to one another in captive fashion in a preassembly position.

4. The fastening system as claimed in claim 1, which provides first stop means, which predetermine a position of the fastening bolt (10) in which the fastening bolt is drawn axially to a maximum extent out of the inner sleeve (12).

5. The fastening system as claimed in claim 4, wherein the first stop means comprise at least one first stop protrusion (22) of the fastening bolt (10) interacting with at least one first stop protrusion (34) of the inner sleeve (12).

6. The fastening system as claimed in claim 4, wherein the first stop means comprise a stop sleeve, which can be fitted onto the fastening bolt (10).

7. The fastening system as claimed in claim 4, wherein the inner sleeve (12) and the outer sleeve (14) have second stop means, which predetermine a position of the inner sleeve (12) in which the inner sleeve is drawn axially to a maximum extent out of the outer sleeve (14).

8. The fastening system as claimed in claim 7, wherein the second stop means comprise at least one second stop protrusion (36) of the inner sleeve (12) interacting with at least one second stop protrusion (46) of the outer sleeve (14).

9. The fastening system as claimed in claim 1, wherein the outer sleeve (14) is designed to be guided by way of a first end through the component through-passage opening (60).

10. The fastening system as claimed in claim 9, wherein, the outer sleeve (14) has a first end having an annular cross-sectional widening (42), which prevents release from the outer sleeve (14) of the first spring washer (16) and the second spring washer (18) once the first spring washer and the second spring washer have been fitted onto the outer sleeve (14).

11. The fastening system as claimed in claim 1, wherein the outer sleeve (14) has an abutment flange (44), which surrounds an introduction end of the first through-passage opening (40) of the outer sleeve and against which a head (24) of the fastening bolt (10) comes into abutment when the component (58) is fastened on the carrier component (62, 62).

12. The fastening system as claimed in claim 1, wherein at least one of the first spring washer (16) or the second spring washer (18) has a collar which extends in an axial direction of the outer sleeve (14) and at least partially surrounds a central opening (54) that is designed to enable the first spring washer or the second spring washer to be pushed onto the outer sleeve (14).

13. A system made up of a fastening system as claimed in claim 1 and of a carrier component (62, 62), with a fastening bore (64) for the fastening bolt (10), and of a component (58), which is to be fastened on said carrier component and has a through-passage opening (60) for the fastening bolt (10).

14. The system as claimed in claim 13, wherein, in the state in which the component (58) is fastened on the carrier component, the component (58) butts only against the first spring washer (16) and second spring washer (18) of the fastening system.

15. The system as claimed in claim 14, wherein the carrier component (62) has a depression (66), which surrounds the fastening bore (64) in an annular manner and is intended for accommodating the first end of the outer sleeve (14).

16. A fastening system for fastening a component (58) on a carrier component (62, 62) of a vehicle, comprising: a fastening bolt (10), which can be fitted through a component through-passage opening (60), an outer sleeve (14) defining an outer sleeve through-passage opening (40), an inner sleeve (12) defining an inner sleeve through-passage opening (32), wherein the inner sleeve (12) is mounted in an axially moveable manner in the outer sleeve through-passage opening (40), the fastening bolt (10) being mounted in an axially moveable manner in said inner sleeve through-passage opening (32), a first spring washer (16) fitted onto the outer sleeve (14) and designed so that, in a state in which the component is fastened on the carrier component (62, 62), the first spring washer positions itself against a first side of the component (58), and a second spring washer (18) fitted onto the outer sleeve (14) and designed so that, in the state in which the component is fastened on the carrier component (62, 62), the second spring washer positions itself against a second side of the component (58), said second side being located opposite the first side.

17. The fastening system as claimed in claim 16, wherein at least one of the outer sleeve (14) or the inner sleeve (12) absorbs compressive forces which occur during an operation of the fastening bolt (10) being fastened in the fastening bore.

18. The fastening system as claimed in claim 16, wherein the fastening bolt (10), the inner sleeve (12), the outer sleeve (14) and the first spring washer (16) are connected to one another in captive fashion in a preassembly position.

19. The fastening system as claimed in claim 16, wherein at least one first stop protrusion (22) of the fastening bolt (10) interacts with at least one first stop protrusion (34) of the inner sleeve (12) to predetermine a position of the fastening bolt (10) in which the fastening bolt is drawn axially to a maximum extent out of the inner sleeve (12).

20. The fastening system as claimed in claim 19, wherein at least one second stop protrusion (36) of the inner sleeve (12) interacts with at least one second stop protrusion (46) of the outer sleeve (14) to predetermine a position of the inner sleeve (12) in which the inner sleeve is drawn axially to a maximum extent out of the outer sleeve (14).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] An exemplary embodiment of the invention will be explained in more detail hereinbelow with reference to figures, in which, schematically:

[0025] FIG. 1 shows an exploded illustration, partly in section, of a fastening system according to the invention,

[0026] FIG. 2 shows a perspective illustration of the inner sleeve of the fastening system from FIG. 1,

[0027] FIG. 3 shows a perspective illustration of the outer sleeve of the fastening system from FIG. 1,

[0028] FIG. 4 shows a perspective illustration of a spring washer of the fastening system from FIG. 1,

[0029] FIG. 5 shows a preassembly position of the fastening system shown in FIG. 1,

[0030] FIG. 6 shows the fastening system from FIG. 5 in a partly assembled state,

[0031] FIG. 7 shows the fastening system from FIG. 5 in a fully assembled state, and

[0032] FIG. 8 shows the illustration from FIG. 7 for a different carrier component.

[0033] Unless specified to the contrary, the figures use like reference signs to indicate like objects.

DETAILED DESCRIPTION

[0034] The fastening system according to the invention comprises five components, namely a fastening bolt 10, an inner sleeve 12, an outer sleeve 14, a first spring washer 16 and a second spring washer 18. The fastening bolt 10 has a stem 20, which has for example an external thread for screwing into an internal thread of a fastening bore of a carrier component. Also formed on the stem 20 is a stop ring 22, which forms a stop protrusion. The fastening bolt 10 also has a head 24, with a head plate 26 and an engagement portion 28 for an assembly tool.

[0035] In the example shown, the inner sleeve 12 is of hollow-cylindrical design. It forms a through-passage opening 32 for the stem 20 of the fastening bolt 10, said through-passage opening being delimited by a sleeve wall 30. The introduction end of the through-passage opening 32, in FIG. 1 the upper end, is provided with, in the example shown, three stop protrusions 34, which are distributed uniformly over the circumference of the inner side of the sleeve wall 30. At the end which is located opposite the introduction end, an encircling stop ring 36 is formed on the outer side of the sleeve wall 30, said stop ring forming a stop protrusion. The inner sleeve 12 may consist, for example, of metal.

[0036] The outer sleeve 14 is likewise of hollow-cylindrical design. A sleeve wall 38 delimits a through-passage opening 40, into which the inner sleeve 12 can be inserted and through which can pass the stem 20 of the fastening bolt 10 together with the inner sleeve 12. At a first end, in FIG. 1 the lower end, the wall 38 of the outer sleeve 14 has an encircling cross-sectional widening 42. An encircling abutment flange 44 is formed at its opposite end, which forms an introduction end for the stem 20 of the fastening bolt 10. Moreover, in the vicinity of the upper end in FIG. 1, the inner side of the sleeve wall 38 is provided with, in the example illustrated, three stop protrusions 46, which are distributed uniformly over the circumference. The stop protrusions 46 may be formed, for example, by being impressed in the sleeve wall, this resulting in corresponding depressions 48 being formed on the outer side of the wall 38. Said depressions have no function here and, accordingly, can also be dispensed with. The outer sleeve 14 may, for example, likewise consist of metal.

[0037] FIG. 4 shows the first spring washer 16 of the fastening system according to the invention. Said first spring washer has a closed outer ring 50, from which a plurality of resilient lugs 52 extend radially inward. The resilient lugs 52, of which six are provided in the example illustrated, together form a central opening 54. It can also be seen in FIG. 4 that collar portions 56 are formed at the free end of each resilient lug 52, said collar portions extending in the axial direction of the central opening 54. Said collar portions 56 form a collar which partially surrounds the central opening 54. The first spring washer 16 may consist, for example, of a metal, in particular a spring steel. The second spring washer 18 is designed in a manner identical to the first spring washer 16. It is merely turned round for assembly purposes, as can be seen for example in FIG. 1.

[0038] FIGS. 5 to 7 will be used to explain in more detail the operation of installing a component 58 with a through-passage opening 60 on a carrier component 62 with a fastening bore 64. As already explained, the fastening bore 64 has preferably an internal thread, which corresponds to the external thread of the fastening bolt 10. The component 58 may be, for example, a heat shield. The carrier component 62 may be, for example, an engine-block component. However, other components and/or carrier components are also possible.

[0039] FIG. 5 shows the fastening system according to the invention in a preassembly position and prior to being installed on the component 58 and the carrier component 62. In this preassembly position, the fastening bolt 10, the inner sleeve 12, the outer sleeve 14 and the first spring washer 16 have been connected to one another in captive fashion. In order to achieve this preassembly position, the fastening bolt 10 is inserted, by way of its stem 20, into the through-passage opening 32 of the inner sleeve 12 and the inner sleeve 12 is inserted into the through-passage opening 40 of the outer sleeve 14. It is also the case that the first spring washer 16 is pushed, by way of its central opening 54, onto the wall 38 of the outer sleeve 14. FIG. 5 shows the fastening bolt 10 in the position in which it is drawn axially to a maximum extent out of the inner sleeve 12 and the inner sleeve 12 in a position in which it is drawn axially to a maximum extent out of the outer sleeve 14. In this position, the stop ring 22 of the fastening bolt 10 comes into abutment against the stop protrusions 34 of the inner sleeve 12. The stop ring 36 of the inner sleeve 12 comes into abutment against the stop protrusions 46 of the outer sleeve 14. It is also the case that the annular cross-sectional widening 42 of the outer sleeve 14 prevents unintended release of the first spring washer 16 from the outer sleeve 14. It can also be seen in FIG. 5 that the cross section of the head plate 26 of the fastening bolt 10 has a larger cross section than the inner sleeve 12 and the through-passage opening 40 of the outer sleeve 14. This means that the aforementioned four components of the fastening system according to the invention are retained on one another in captive fashion in the preassembly position shown in FIG. 5.

[0040] Of course, it is necessary, for assembly purposes, for the interacting stop protrusions to be guided past one another to some extent. This can be achieved in each case with elastic deformation taking place and a corresponding compressive force being applied. Correspondingly, it is also possible for the components which are shown in a preassembled state in FIG. 5 to be released from one another again by an appropriate tensile force being applied. However, the components do not become released of their own accord, and they can therefore readily be delivered in this state, even combined into relatively large quantities, for example to an assembly site.

[0041] For continued preassembly, proceeding from the preassembly position shown in FIG. 5, first of all the outer sleeve 38 is pushed into the through-passage opening 60 of the component 58 and the second spring washer 18 is fitted onto the outer sleeve 14 from the opposite side of the component. The cross-sectional widening 42 of the outer sleeve 14 here, in turn, passes through the central opening 54 of the second spring washer 18, and it is therefore then also the case that the second spring washer 18, and with it the component 58, are connected in captive fashion to the rest of the components of the fastening system. In this preassembled state, it is possible for the component 58, together with the fastening system, to be aligned in relation to the carrier component 62 and be moved into the position which is shown in FIG. 6.

[0042] It should also be pointed out that the carrier component 62 has a depression 66, which surrounds the fastening bore 64 in an annular manner and is intended for accommodating the first end of the outer sleeve 14, in particular for accommodating the cross-sectional widening 42 of the outer sleeve 14. The depression 66 here has been adapted to the shape of the cross-sectional widening 42. In particular, the annular depression 66 has an accommodating diameter which is only insignificantly larger than the external diameter of the cross-sectional widening 42, the latter therefore being accommodated in an accurately fitting manner by the depression 66. This achieves centering of the fastening system, and thus of the fastening bolt 10, in relation to the fastening bore 64 of the carrier component 62, as can be seen in particular in the preassembly state shown in FIG. 6, prior to the fastening bolt 10 being screwed in.

[0043] For completion of assembly, the fastening bolt 10 is screwed into the fastening bore 64 of the carrier component 62 from the position which is shown in FIG. 6. In the definitively assembled state, the head plate 26 of the bolt head 24 comes into abutment against the abutment flange 44 of the outer sleeve 14. The opposite end of the outer sleeve 14, as can be seen in the figures, is supported on the carrier component 62 via the cross-sectional widening 42. In this way, the outer sleeve 14 absorbs the compressive forces which occur when the fastening bolt 10 is being screwed in, and said forces are therefore not transmitted to the component 58.

[0044] It can also be seen in FIG. 7 that, in the state in which it is definitively installed on the carrier component, the component 58 comes into contact only with the first and second spring washers 16, 18 and, in particular, not with the outer sleeve 14. This results in the component 58 being isolated from the carrier component 62 to particularly good effect in terms of vibration and heat. For removal purposes, it is possible for the fastening bolt 10 to be unscrewed again from the fastening bore 64 and then for the component 58 to be released from the carrier component 62. In order also for the fastening system to be removed from the component 58, the second spring washer 18 can then be drawn off from the outer sleeve 14 over the cross-sectional widening 42, with elastic deformation taking place in the process.

[0045] FIG. 8 shows the same illustration as shown in FIG. 7, but for a different carrier component 62. The latter carrier component 62 differs from the example shown in FIGS. 6 and 7 merely in that it has no depression 66. Accordingly, the outer sleeve 14 rests on the upper side of the carrier component 62. Otherwise, the example from FIG. 8 corresponds to the example explained with reference to FIGS. 1 to 7.

LIST OF REFERENCE SIGNS

[0046] 10 Fastening bolt

[0047] 12 Inner sleeve

[0048] 14 Outer sleeve

[0049] 16 First spring washer

[0050] 18 Second spring washer

[0051] 20 Stem

[0052] 22 Stop ring

[0053] 24 Bolt head

[0054] 26 Head plate

[0055] 28 Engagement portion

[0056] 30 Sleeve wall

[0057] 32 Through-passage opening

[0058] 34 Stop protrusions

[0059] 36 Stop ring

[0060] 38 Sleeve wall

[0061] 40 Through-passage opening

[0062] 42 Cross-sectional widening

[0063] 44 Abutment flange

[0064] 46 Stop protrusions

[0065] 48 Depressions

[0066] 50 Outer ring

[0067] 52 Resilient lugs

[0068] 54 Central opening

[0069] 56 Collar portions

[0070] 58 Component

[0071] 60 Through-passage opening

[0072] 62 Carrier component

[0073] 62 Carrier component

[0074] 64 Fastening bore

[0075] 66 Depression