Holder for fastening a component on an internal combustion engine, a bearing sleeve for such a holder, and a fuel injection system

Abstract

A bearing sleeve for a holder, which is used for fastening a fuel distributor on an add-on structure, includes a first sleeve part and a second sleeve part. The first sleeve part has a rigid sleeve body and a damping element which is integrally connected to the sleeve body of the first sleeve part. The second sleeve part has a rigid sleeve body and a damping element which is integrally connected to the sleeve body of the second sleeve part.

Claims

1. A bearing sleeve for a holder used for fastening a component, which is a fuel distributor, on an add-on structure, comprising: a first sleeve part including (1) a first rigid sleeve body, (2) a first damping element integrally connected to the first sleeve body, and (3) a first additional damping element integrally connected to the first sleeve body and completely separated from the first damping element by a free space, wherein the first damping element and the first additional damping element are vulcanized onto the first rigid sleeve body; and a second sleeve part including (1) a second rigid sleeve body, (2) a second damping element integrally connected to the second sleeve body, and (3) a second additional damping element integrally connected to the second sleeve body and completely separated from the second damping element by a free space, wherein the second damping element and the second additional damping element are vulcanized onto the second rigid sleeve body.

2. The bearing sleeve of claim 1, wherein the rigid sleeve body of the first sleeve part is at least essentially made from a metallic material, and/or the rigid sleeve body of the second sleeve part is at least essentially made from a metallic material.

3. The bearing sleeve of claim 1, wherein the damping element of the first sleeve part is made of rubber, especially natural rubber or a synthetic rubber material, and/or the damping element of the second sleeve part is made of rubber, including at least one of a natural rubber and a synthetic rubber material.

4. The bearing sleeve of claim 1, wherein the rigid sleeve body of the first sleeve part has a disk-shaped section, which is oriented at least approximately perpendicularly to a longitudinal axis, and a sleeve-shaped section, which extends at least approximately along the longitudinal axis.

5. The bearing sleeve of claim 4, wherein the first damping element is vulcanized onto the disk-shaped section of the first rigid sleeve body, and the first additional damping element is vulcanized onto the sleeve-shaped section of the first rigid sleeve body.

6. The bearing sleeve of claim 4, wherein the damping element of the first sleeve part is regionally connected to the disk-shaped section of the rigid sleeve body of the first sleeve part, and regionally to the sleeve-shaped section of the rigid sleeve body of the first sleeve part.

7. The bearing sleeve of claim 4, wherein the damping element of the first sleeve part is connected to the disk-shaped section of the rigid sleeve body of the first sleeve part, and the first sleeve part has at least one second damping element, which is connected to the sleeve-shaped section of the rigid sleeve body of the first sleeve part.

8. The bearing sleeve of claim 4, wherein at least one additional damping element of the first sleeve part is connected to the disk-shaped section of the rigid sleeve body of the first sleeve part, and/or at least one further damping element of the first sleeve part is connected to the sleeve-shaped section of the rigid sleeve body of the first sleeve part.

9. The bearing sleeve of claim 1, wherein depressions are formed on at least one damping element.

10. The bearing sleeve of claim 1, wherein the first sleeve part and the second sleeve part are configured as components in common, and/or the rigid sleeve body of the first sleeve part and the rigid sleeve body of the second sleeve part are configured as components in common.

11. The bearing sleeve of claim 1, wherein the rigid sleeve body of the second sleeve part is configured as disk-shaped rigid sleeve body having a central opening.

12. The bearing sleeve of claim 1, wherein the component is a fuel distributor.

13. The bearing sleeve of claim 1, wherein the first sleeve part and second sleeve part are configured to be fastened to opposite sides of the component, relative to one another.

14. The bearing sleeve of claim 13, wherein the first sleeve part and second sleeve part are configured to be fastened on the opposite sides of the component, and to the add-on structure via a screw.

15. The bearing sleeve of claim 14, wherein when fastened to the component and the add-on structure, the rigid sleeve body of the first sleeve part touches the rigid sleeve body of the second sleeve part.

16. A holder for fastening a component on an add-on structure, comprising: a holder body; and at least one bearing sleeve, including a first sleeve part and a second sleeve part, wherein the first sleeve part has (1) a first rigid sleeve body, (2) a first damping element integrally connected to the first sleeve body, and (3) a first additional damping element integrally connected to the first sleeve body and completely separated from the first damping element by a free space, wherein the first damping element being vulcanized onto the first rigid sleeve body, wherein the second sleeve part has (1) a second rigid sleeve body, (2) a second damping element integrally connected to the second sleeve body, and (3) a second additional damping element integrally connected to the second sleeve body and completely separated from the second damping element by a free space, wherein the second damping element and the second additional damping element are vulcanized onto the second rigid sleeve body, and wherein the holder body is at least regionally clamped between at least one damping element of the first sleeve part and at least one damping element of the second sleeve part, so as to connect the holder body to the bearing sleeve.

17. The holder of claim 16, wherein the component is a fuel distributor and the add-on structure is an internal combustion engine.

18. The fuel injection system of claim 16, wherein the first rigid sleeve body of the first sleeve part has a disk-shaped section, which is oriented at least approximately perpendicularly to a longitudinal axis, and a sleeve-shaped section, which extends at least approximately along the longitudinal axis.

19. The fuel injection system of claim 18, wherein the first damping element is vulcanized onto the disk-shaped section of the first rigid sleeve body, and the first additional damping element is vulcanized onto the sleeve-shaped section of the first rigid sleeve body.

20. A fuel-injection system, comprising: a fuel distributor; and at least one holder, for fastening the fuel distributor on an internal combustion engine, including: a holder body; and at least one bearing sleeve, including a first sleeve part and a second sleeve part, the second sleeve part, wherein the first sleeve part has (1) a first rigid sleeve body, (2) a first damping element integrally connected to the first sleeve body, and (3) a first additional damping element integrally connected to the first sleeve body and completely separated from the first damping element by a free space, wherein the first damping element being vulcanized onto the first rigid sleeve body, wherein the second sleeve part has (1) a second rigid sleeve body, (2) a second damping element integrally connected to the second sleeve body, and (3) a second additional damping element integrally connected to the second sleeve body and completely separated from the second damping element by a free space, wherein the second damping element and the second additional damping element are vulcanized onto the second rigid sleeve body, and wherein the holder body is at least regionally clamped between at least one damping element of the first sleeve part and at least one damping element of the second sleeve part, so as to connect the holder body to the bearing sleeve.

21. The fuel injection system of claim 20, wherein the first rigid sleeve body of the first sleeve part has a disk-shaped section, which is oriented at least approximately perpendicularly to a longitudinal axis, and a sleeve-shaped section, which extends at least approximately along the longitudinal axis.

22. The fuel injection system of claim 21, wherein the first damping element is vulcanized onto the disk-shaped section of the first rigid sleeve body, and the first additional damping element is vulcanized onto the sleeve-shaped section of the first rigid sleeve body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a fuel injection system having a fuel distributor and a holder, which is used to fasten the fuel distributor on an internal combustion engine, in a cutaway, schematic sectional representation corresponding to a first exemplary embodiment of the present invention.

(2) FIG. 2 shows the detail, denoted by II in FIG. 1, of a sleeve part of the bearing sleeve of the holder, in a schematic sectional view corresponding to the first exemplary embodiment of the present invention.

(3) FIG. 3 shows the detail of the sleeve part of the bearing sleeve shown in FIG. 2 according to a second exemplary embodiment of the present invention.

(4) FIG. 4 shows the sleeve part, shown in a detail view in FIG. 2, of the bearing sleeve according to a third exemplary embodiment of the present invention.

(5) FIG. 5 shows the sleeve part, shown in a detail view in FIG. 2, of the bearing sleeve according to a fourth exemplary embodiment of the present invention.

DETAILED DESCRIPTION

(6) FIG. 1 shows a fuel injection system 1 having a fuel distributor 2 and a holder 3, which is used to fasten fuel distributor 2 on an internal combustion engine 4, in a cutaway, schematic sectional representation according to a first exemplary embodiment. Holder 3 has a bearing sleeve 5.

(7) Fuel injection system 1 is particularly suitable for mixture-compressing internal combustion engines 4 having externally supplied ignition. In this exemplary embodiment, holder 3 is fixed in place on an add-on structure 6 via its bearing sleeve 5. The fastening uses a suitable fastening arrangement 7, in particular a screw 7. A cylinder head 6 of internal combustion engine 4, in particular, may be used as add-on structure 6. In this exemplary embodiment, a row of fuel injectors 8 is furthermore fixated together with fuel distributor 2 on internal combustion engine 4.

(8) Holder 3 has a holder body 9. Bearing sleeve 5 has a first sleeve part 11 and a second sleeve part 12.

(9) In this particular exemplary embodiment, first sleeve part 11 forms an upper sleeve part 11 of bearing sleeve 5, while second sleeve part 12 forms a lower sleeve part 12 of bearing sleeve 5. Upper sleeve part 11 is disposed at a distance from add-on structure 6, while lower sleeve part 12 is situated on add-on structure 6. Holder body 9 is fixated between sleeve parts 11, 12 during the assembly. Depending on the configuration of holder 3, in particular bearing sleeve 5, the lower sleeve part may also be formed by first sleeve part 11, while the upper sleeve part is formed by second sleeve part 12.

(10) First sleeve part 11 has a rigid sleeve body 13 and a damping element 14 which is integrally connected to sleeve body 13. Rigid sleeve body 13 of first sleeve part 11 is made from a metallic material. Damping element 14 of first sleeve part 11 is made of rubber, especially natural rubber or a synthetic rubber material. Damping element 14 may be connected to rigid sleeve body 13 by vulcanization. Damping element 14 is configured as elastically deformable damping element 14.

(11) Second sleeve part 12 has a rigid sleeve body 15 and a damping element 16, which is integrally connected to sleeve body 15. Damping element 16 of second sleeve part 12 is connected to rigid sleeve body 15 of second sleeve part 12 by vulcanization. Rigid sleeve body 15 of second sleeve part 12 is made from a metallic material. The metallic material of sleeve body 15 of second sleeve part 22 may be the same metallic material that is used for rigid sleeve body 13 of first sleeve part 11, but it is also possible to use different metallic materials. Furthermore, damping element 16 may be made from rubber, especially natural rubber, or a synthetic rubber material. Damping elements 14, 16 may be produced from the same material or also from other materials.

(12) Holder body 9 has an opening 17, which is configured as through-hole 17. Sleeve parts 11, 12 are inserted into through-hole 17 from different sides along a longitudinal axis 18. Fastening screw 7 is screwed into add-on structure 6 for the assembly. If damping elements 14, 16 of sleeve parts 11, 12 during the assembly come to rest against holder body 9 without pretension as yet, then a gap 19 remains along longitudinal axis 18 between sleeve parts 11, 12. This gap 19 is utilized for the pretensioning of damping elements 14, 16. For fastening screw 7 is screwed into add-on structure 6 up to the point where rigid sleeve bodies 13, 15 of sleeve parts 11, 12 come to a hard stop. A further tightening torque produces a fastening force that will then be absorbed by rigid sleeve bodies 13, 15 of sleeve parts 11, 12 of bearing sleeve 5, and no further loading of damping elements 14, 16 will occur. The pretensioning of damping elements 14, 16 thus is defined solely by predefined gap 19. That means that the pretensioning of damping elements 14, 16 is independent of the tightening torque of fastening screw 7. For construction-related reasons, the resulting tolerances are also so low that the pretension of damping elements 14, 16 is able to be predefined relatively precisely via gap 19. As a result, overloading of damping elements 14, 16 on the one hand, and insufficient pretensioning of damping elements 14, 16 on the other are avoided. This not only prevents overloading of damping elements 14, 16, but also obtains sufficient holding force with respect to holder body 9 in at least a radial direction 20 which is oriented perpendicularly to longitudinal axis 18.

(13) In the assembled state, damping elements 14, 16 of sleeve parts 11, 12 of bearing sleeve 5 ensure both a radial and an axial isolation of the vibrations in order to spatially optimize the isolating effect. Direct contacts between holder body 9 and rigid sleeve bodies 13, 15 of sleeve parts 11, 12 are hereby prevented. In particular metal-to-metal contacts are prevented.

(14) Potential configurations of first sleeve part 11 of bearing sleeve 5 are described in greater detail in the following text with reference to FIG. 2 through 5. Second sleeve part 12 may be configured in a manner that corresponds to first sleeve part 11. However, the configuration of second sleeve part 12 may also differ from that of first sleeve part 11. In particular, rigid sleeve body 15 of second sleeve part 12 may be configured as disk-shaped rigid sleeve body 15 having an at least approximately central opening 21. Opening 21 is used for the insertion of fastening arrangement 7.

(15) FIG. 2 shows the detail, denoted by II in FIG. 1, of first sleeve part 11 of bearing sleeve 5 of holder 3 in a schematic sectional view according to the first exemplary embodiment. Rigid sleeve body 13 has an axial extension 22. Axial extension 22 of rigid sleeve body 13 is simultaneously axial extension 22 of first sleeve part 11. Gap 19 is adjusted via the length of axial extension 22. Axial extension 22 of first sleeve part 11 and an axial extension 24 of second sleeve part 12 are used for bridging a thickness 23 of holder body 9 and for specifying axial gap 19. In order to bridge thickness 23 of holder body 9, axial extension 22 of first sleeve part 11 may also be selected larger if axial extension 24 of second sleeve part 12 is selected correspondingly shorter, and vice versa. Thickness 23 of holder body 9 as well as gap 19 may be distributed between first sleeve part 11 and second sleeve part 12, so to speak. In borderline cases, given a correspondingly small axial extension 24 of second sleeve part 12, second sleeve part 12 turns into a disk-shaped sleeve part 12. Damping element 16 will then be configured as disk-shaped damping element 16 and disposed on disk-shaped sleeve body 15. In this case, damping element 16 will now be acting only in the axial direction.

(16) Rigid sleeve body 13 of first sleeve part 11 has a disk-shaped section 30 and a sleeve-shaped section 31. Disk-shaped section 30 is oriented perpendicularly to longitudinal axis 18. Sleeve-shaped section 31 extends along longitudinal axis 18. In this exemplary embodiment, damping element 14 has a disk-shaped section 32 and a sleeve-shaped section 33. Disk-shaped section 32 is oriented perpendicularly to longitudinal axis 18. Sleeve-shaped section 33 of damping element 14 extends along longitudinal axis 18. In this exemplary embodiment, damping element 14 is therefore regionally connected to disk-shaped section 30 of rigid sleeve body 13, and regionally connected to sleeve-shaped section 31 of rigid sleeve body 13. Between disk-shaped section 30 and sleeve-shaped section 31, rigid sleeve body 13 has an edge 34. In this particular exemplary embodiment, damping element 14 is also provided in the region of edge 34. Damping element 14 has an edge section 35 at edge 34. During the production the material for configuring damping element 14 may be extruded onto rigid body 13, for example. This causes edge section 35 of damping element 14 to come to rest against edge 34 without a gap.

(17) In the assembled state, disk-shaped section 32 of damping element 14 absorbs axial movements of holder body 9, as indicated by double arrow 36. Sleeve-shaped section 33 of damping element 14, on the other hand, absorbs radial movements of holder body 9, as indicated by double arrow 37. The integral connection between damping element 14 and rigid sleeve body 13 prevents relative movements between damping element 14 and rigid sleeve body 13.

(18) FIG. 3 shows sleeve part 11 of bearing sleeve 5 illustrated in a cutaway view in FIG. 2 according to a second exemplary embodiment. In this exemplary embodiment, damping element 14 is connected to disk-shaped section 30 of rigid sleeve body 13. In addition, a second damping element 40 is provided, which is connected to sleeve-shaped section 31 of rigid sleeve body 13. Damping element 14 is configured as disk-shaped damping element 14 in this exemplary embodiment. Second damping element 40 is configured as sleeve-shaped damping element 40. In this particular exemplary embodiment, a free space 41 with respect to abutting damping elements 14, 40 is provided in the region of edge 34 of rigid sleeve body 13. This allows damping elements 14, 40 to expand into free space 41 in response to vibrations of holder body 9, as indicated by arrows 42, 43. High dynamic rigidness, which impairs the isolating effect in a complete chambering, is thereby avoided. Layer-shaped damping elements 14, 40 are able to breathe in the direction of arrows 42, 43, so to speak. The configuration using multiple damping elements 14, 40 enlarges the free surface in the sum. The vibration damping is thus able to be improved with respect to the particular application.

(19) FIG. 4 shows sleeve part 11 of bearing sleeve 5, shown as a cutaway view in FIG. 2, according to a third exemplary embodiment. In this exemplary embodiment, damping element 14 is connected to disk-shaped section 30 of rigid sleeve body 13. Second damping element 40 is connected to sleeve-shaped section 31 of rigid sleeve body 13. A free space 41 is provided between damping elements 14, 40 at edge 34. In addition, damping element 14 has depressions 44, 45. Profiling of damping element 14 is achieved with the aid of depressions 44, 45. In analogous manner, second damping element 40 has depressions 46, 47 as well. If second damping element 40 is acted upon as a result of vibrations of holder body 9, for example, then the elastically deformable material of second damping element 40 may breathe in the direction of arrows 48, 49, among others, or escape into depression 46. The same applies to depression 47. This improves the elastic deformability of second damping element 40. The behavior of damping element 14 is optimized accordingly.

(20) A holding force on holder body 9 is also able to be enhanced, especially with the aid of depressions 44, 45 of damping element 14.

(21) FIG. 5 shows sleeve part 11 of bearing sleeve 5, shown in a cutaway view in FIG. 2, according to a fourth exemplary embodiment. In this exemplary embodiment, damping element 14 is connected to disk-shaped section 30 of rigid sleeve body 13. Furthermore, a further damping element 50 is provided, which is connected to disk-shaped section 30 of rigid sleeve body 13. In addition, damping element 40 is connected to sleeve-shaped section 31 of rigid sleeve body 13. Moreover, a further damping element 51 is situated at sleeve-shaped section 31 of rigid sleeve body 13, which may be connected to rigid sleeve body 13 by vulcanization. As a result, damping elements 14, 50 are integrally connected to disk-shaped section 30 of rigid sleeve body 13, and damping elements 40, 51 are integrally connected to sleeve-shaped section 31 of rigid sleeve body 13. An annular free space 52 is provided between damping elements 14, 50. Furthermore, free space 41 is provided between damping elements 50, 51 in the region of edge 34 of rigid sleeve body 13. In addition, a free space 53 is available between damping elements 40, 51.

(22) Damping elements 14, 40, 50, 51 may be configured in the form of a ring. Because of free spaces 41, 52, 53, damping elements 14, 40, 50, 51 are better able to deform due to the additional degrees of freedom. For example, further damping element 50 is able to breathe in the direction of arrows 54, 55.

(23) The profiling and subdividing may also be implemented in the axial direction and not necessarily in the form of a circle. Possible is also a configuration in the form of a nub-type profiling.

(24) The present invention is not limited to the exemplary embodiments described.