Mounting device

Abstract

Mounting device (20) for attaching an exhaust gas turbocharger to an internal combustion engine, comprising a first mounting element (21) which is associated with the internal combustion engine as a mounting point and a second mounting element (1) which is associated with the exhaust gas turbocharger, wherein the first mounting element (21) is connected to the second mounting element (1) along an axis via a connecting means (24), wherein a decoupling element (4, 4a, 4b) is arranged between the first mounting element (21) and the second mounting element (1), which at least partially comprises at least one of the mounting elements (1, 21), wherein the decoupling element (4, 4a, 4b) is designed in two parts, wherein the decoupling element (4, 4a, 4b) is formed from a wire mesh, characterized in that the first mounting element (21) has a substantially Y-shaped form, wherein a fork-like region of the Y-shaped form is formed by a first finger (22) and a second finger (23),wherein the fingers (22, 23) are substantially parallel to each other, the fork-like region forming an end region facing away from the internal combustion engine, the first finger (22) having a first opening (25) and the second finger (23) having a second opening (26), the first opening (25) and the second opening (26) being in alignment.

Description

[0001] The invention relates to a mounting device, in particular for attaching an exhaust gas turbocharger to an internal combustion engine, comprising a first mounting element which is associated with an internal combustion engine and a second mounting element which is associated with an exhaust gas turbocharger.

[0002] Exhaust gas turbochargers are often used to optimize the performance and efficiency of combustion engines. These utilize the energy in the exhaust gas stream to introduce a larger quantity of fresh air into the working cylinder, thereby increasing the power output of the combustion engine or improving its efficiency.

[0003] Exhaust gas turbochargers feature an exhaust-side turbine and a fresh air-side turbine, coupled to each other via a common shaft. The fresh air-side turbine is driven by the shaft, which is in turn driven by the exhaust-side turbine. It compresses the fresh air before it enters the working cylinder, generating increased boost pressure and resulting in improved cylinder filling.

[0004] Modern exhaust gas turbochargers achieve very high turbine speeds, which can reach several hundred thousand revolutions per minute.

[0005] To decouple the exhaust gas turbocharger from the vibrations of the combustion engine, it is often fixed to the engine using a mounting device. This mounting device can incorporate a damping element for decoupling purposes. Numerous solutions for this purpose are known in the prior art.

[0006] A disadvantage of state-of-the-art solutions is that the design and costs are relatively high when a decoupling element is used. With mounting devices lacking a decoupling element, the exhaust gas turbocharger is not adequately protected from vibrations.

[0007] DE 10 2009 031 980 B3 discloses an exhaust gas converter which is provided with module holders, wherein an engine holder is attached to an internal combustion engine and the engine holder is connected to the module holders by means of at least one screw connection.

[0008] German patent DE 10 2006 011 915 A1 discloses an exhaust pipe bracket for connecting and supporting an exhaust pipe. The exhaust pipe bracket comprises a pipe-side mounting, a vehicle-side mounting, and a retaining element, the retaining element connecting the pipe-side mounting to the vehicle-side mounting.

[0009] DE 20 2007 003 805 U1 discloses a structure-borne sound decoupling element with a ring-corrugated or helically corrugated metal bellows.

[0010] DE 10 2006 037 201 A1 discloses a hand-held work device with an internal combustion engine and an exhaust silencer, wherein the exhaust silencer is fixed to the internal combustion engine at at least one attachment point with limited relative movement.

[0011] US Patent 6,328,513 B1 discloses a connection with perforated disc elements with a damping intermediate element.

[0012] DE 20 2011 001 961 U1 discloses a screw connection with a decoupling element with several sheet metal layers.

[0013] DE 16 55 607 A discloses a shock absorber for the suspension of vehicle parts, wherein two rigid elements are connected via a stack of annular cushions, the annular cushions being produced by knitting metallic threads.

[0014] Therefore, the object of the present invention is to provide a holder with a damping element which is optimized compared to the prior art.

[0015] The problem with regard to the draining device is solved by the features of claim 1.

[0016] One embodiment of the invention relates to a mounting device, in particular for attaching an exhaust gas turbocharger to an internal combustion engine, comprising a first mounting element which is associated with a mounting point, such as that of the internal combustion engine, and a second mounting element which is associated with an exhaust gas turbocharger, wherein the first mounting element is connected to the second mounting element via a connecting means, wherein a decoupling element is arranged between the first mounting element and the second mounting element, which at least partially comprises at least one of the mounting elements, wherein the decoupling element is designed in two parts, and wherein the decoupling element is formed from a wire mesh.

[0017] Effective isolation of the exhaust gas turbocharger from the combustion engine can be achieved using a mounting device comprising a first and a second mounting element connected by a decoupling element. Advantageously, the first and second mounting elements are only in contact with each other via the decoupling element. Any direct contact between the two mounting elements would inevitably lead to vibration transmission from the combustion engine to the exhaust gas turbocharger.

[0018] A wire mesh is particularly temperature-resistant compared to an elastomer element. Especially in the area near the combustion engine, very high temperatures can occur during operation, which can have a negative long-term effect on elastomer elements. The proximity to the exhaust system further exacerbates this situation. Furthermore, a decoupling element made of wire mesh can exhibit higher strength.

[0019] Furthermore, it may be advantageous if the first retaining element has a substantially Y-shaped form, wherein the fork-like area is formed by a first finger and a second finger which are substantially parallel to each other, wherein the fork-like area forms the end region facing away from the internal combustion engine, and the first finger has a first opening and the second finger has a second opening, wherein the first opening and the second opening are in alignment.

[0020] The Y-shaped design of the first retaining element is particularly advantageous because the second retaining element, the decoupling element and any fixing element that may be present can be arranged between the two fingers of the fork-like area.

[0021] The fingers are advantageously designed to be so massive that a sufficiently high clamping force can be applied to them to fix the other elements between the fingers without damagingly deforming the fingers themselves.

[0022] It may also be advantageous if the second retaining element has an essentially U-shaped form, with the end region facing away from the exhaust gas turbocharger located in the area of ​​the apex of the U-shaped form and a third opening arranged in the apex.

[0023] The third opening allows the second retaining element to be connected particularly advantageously to the decoupling element and the first retaining element.

[0024] The exhaust gas turbocharger can be advantageously connected to the second mounting element via the two legs of the U-shaped mounting element. The second mounting element can, for example, be stamped from a sheet of metal, produced using a flame-cutting process, or cast.

[0025] Furthermore, it is preferable if the second retaining element has a reinforcing element in the area of ​​the third opening, which increases the material thickness around the third opening.

[0026] The stability of the retaining element can be increased by using such a reinforcing element, which can be formed, for example, by a disc. A particular advantage is that the material thickness does not need to be increased across the entire retaining element, but only partially in the areas requiring reinforcement. This makes the retaining element lighter overall and requires less material.

[0027] In a particularly advantageous embodiment of the invention, it is also provided that the decoupling element engages in the third opening of the second retaining element.

[0028] By engaging the decoupling element in the third opening, the retaining element is positioned relative to the decoupling element. This also ensures that the two retaining elements do not come into direct contact with each other. The decoupling element effectively forms a boundary layer between the first and second retaining elements.

[0029] In an alternative embodiment of the invention, it may be provided that the decoupling element has a first channel which completely penetrates the decoupling element.

[0030] The channel inside the decoupling element is advantageous because a connecting element can be guided through it. This allows for secure positioning of the decoupling element relative to the retaining elements, through whose openings the connecting element is also guided for the purpose of connection.

[0031] It is also preferable if the decoupling element and / or the second holding element are enclosed by a fixing element.

[0032] A fixing element can be formed, in particular, by a sleeve with a flange-like end region and a fixing disc. Advantageously, the sleeve is guided through the channel of the decoupling element so that the flange-like end region and the fixing disc enclose the decoupling element.

[0033] This serves to stabilize the decoupling element, which engages in the third opening of the second retaining element. The connecting element can advantageously be guided through the sleeve and also through the first and second openings of the first and second fingers. The two fingers are positioned in front of and behind the sleeve, viewed along its central axis.

[0034] In a further advantageous embodiment, it can be provided that a preload force can be generated by the connecting means, by which the elements of the holding device can be connected to each other and fixed to each other.

[0035] A preload force applied externally to the first and second fingers creates pressure on the entire assembly, consisting of the first and second retaining elements, the sleeve, and the decoupling element. This allows the individual elements to be fixed to one another.

[0036] In particular, a twisting of the individual elements relative to each other can be avoided by a sufficiently high preload force.

[0037] Furthermore, it may be advantageous if the connecting element is formed by a screw connection.

[0038] A bolted connection is particularly advantageous as a fastening device because it allows for both easy assembly and disassembly. Furthermore, the preload force generated by the bolted connection can be easily varied.

[0039] Advantageous embodiments of the present invention are described in the dependent claims and the following description of the figures.

[0040] The invention will now be explained in detail using an exemplary embodiment and with reference to the drawings. The drawings show: Fig. 1 a perspective view of the second holding element with the decoupling element and the fixing element, which is formed from a sleeve with a flange-like end area and a fixing disc, Fig. 2 a side view of the Fig. 1, Fig. 3 a sectional view of the Fig. 2, Fig. 4 a perspective view of the mounting device, with the first mounting element, the second mounting element, the decoupling element, the fixing element and the connecting element, Fig. 5 a side view of the Fig. 4, Fig. 6 a sectional view of the Fig. 5, and Fig. 7 another side view of the Fig. 4.

[0041] The Fig. Figure 1 shows a perspective view of the second retaining element 1. On the second retaining element 1, a decoupling element 4, which is divided into the first part 4a and the second part 4b, a sleeve 6 and a fixing disc 5, which together with the sleeve 6 represents a fixing element, is arranged.

[0042] The second retaining element 1 has a U-shaped base. This is formed by the first leg 2 and the second leg 3, which meet at a vertex. Receipt areas 8a and 8b for the exhaust gas turbocharger are provided at the end regions of the first leg 2 and the second leg 3 facing away from the vertex.

[0043] At these receiving areas 8a, 8b, the first leg 2 and the second leg 3 also have an additional opening through which the second retaining element 1 can be connected to an exhaust gas turbocharger. Advantageously, the receiving areas 8a, 8b can each engage with a contour of the exhaust gas turbocharger to establish a secure connection with the exhaust gas turbocharger.

[0044] The end regions of legs 2, 3 are wider than the rest of legs 2, 3. In a top view, each leg 2, 3 is L-shaped, with the end region being formed by the shorter section of the L-shape. The recording areas 8a, 8b have a slightly curved contour in the top view.

[0045] The second retaining element 1 has a third opening in the area of ​​its apex. This opening is not visible due to the covering by the decoupling element 4 or the fixing disc 5. However, it runs concentrically with the opening in Fig. The bore 7 shown in Figure 1 passes through both the fixing disc 5 and the sleeve 6. More detailed information on the arrangement of the individual elements follows in the subsequent figures.

[0046] Additionally, the second retaining element 1 has a reinforcing disc 9 in the area of ​​its apex, which partially increases the material thickness of the second retaining element 1.

[0047] The reinforcing washer 9 can, for example, be connected to the second retaining element 1 by soldering. A particular advantage of the reinforcing washer is that the material thickness of the second retaining element is increased only in the area of ​​its apex, without increasing the material thickness of the rest of the second retaining element 1. This saves material, which also leads to a reduction in costs and weight of the component.

[0048] The Fig. Figure 2 shows a side view of the second retaining element 1, as already shown in Fig. Figure 1 shows that the reinforcing disc 9 is applied flat to a surface of the second retaining element 1. A second part 4b of the decoupling element 4 adjoins the reinforcing disc 9 to the right, and the first part 4a of the decoupling element 4 adjoins the first leg 2 of the second retaining element 1 to the left.

[0049] The sleeve 6 extends through the decoupling element 4 and the second retaining element 1, and has an axial extension through the decoupling element 4 and the second retaining element 1, and a radial flange-like extension which forms a contact surface for the decoupling element 4a.

[0050] On the right side, a fixing disc 5 follows the second part of the decoupling element 4b, which serves as a contact surface for the second part 4b of the decoupling element 4b.

[0051] The fixing disc 5 has a bore which is concentric with the one in Fig. 1 is aligned with the bore 7 shown.

[0052] The sleeve 6, the fixing disc 5, the decoupling element 4, the reinforcing disc 9, and the second retaining element 1 are arranged relative to each other such that a straight channel runs through the entire assembly. In an ideal embodiment, the openings or bores of the individual elements are aligned so that they are concentric with each other.

[0053] The Fig. Figure 3 shows a cross-sectional view through the in Fig. 2. Illustration of the second retaining element 1.

[0054] In the Fig. Figure 3 shows how the individual elements sleeve 6, decoupling element 4, second holding element 1, reinforcing disc 9 and fixing disc 5 follow one another.

[0055] The sleeve 6 has an axially extending section that passes through the decoupling element 4. Furthermore, the sleeve 6 has a radially extending, flange-like section. Together with the fixing disc 5, the sleeve 6 forms a receiving area around the axial section of the sleeve 6 for the two parts 4a and 4b of the decoupling element 4.

[0056] A dividing line 10 runs between the first part 4a of the decoupling element 4 and the second part 4b of the decoupling element 4.

[0057] The bore 7 is bounded radially outwards by the inner wall of the sleeve 12. The sleeve 6 itself is inserted into a channel formed by the decoupling element 4. This channel is bounded by the inner wall 13. The axially extending portion of the sleeve 6 rests directly against the inner wall 13 of the channel. The decoupling element 4 has a circumferential groove into which the second retaining element 1 and the reinforcing washer 9 are inserted. The second retaining element 1 has a third opening, which is bounded axially outwards by the inner wall 11.

[0058] The cross-section shows that the decoupling element 4 engages in particular in the third opening of the second retaining element 1, thus ensuring that the second retaining element 1 is only in direct contact with the decoupling element 4 and not with the sleeve 6 or the fixing disc 5. This is particularly advantageous with regard to the vibration decoupling that the retaining device is intended to achieve.

[0059] The radially oriented section of the sleeve 6 and the fixing disc 5 rest directly against the lateral end regions of the decoupling element 4. By applying a force to the sleeve 6 and / or the fixing disc 5, a force can be exerted on the decoupling element 4, thereby fixing the second retaining element 1 within the decoupling element 4 and making it difficult or completely impossible for the individual elements to rotate relative to each other. The length of the axial section of the sleeve 6 is matched to the width of the decoupling element 4 in such a way that an interference fit can be achieved, which makes relative movement between the individual elements difficult or impossible.

[0060] The force exerted on the decoupling element 4 can also influence the insulation and damping effect of the decoupling element 4 itself. This must be taken into account when designing the length of the sleeve 6 and dimensioning the contact force.

[0061] The Fig. Figure 4 shows a perspective view of the mounting device 20. In addition to the ones already shown in the Fig. 1, Fig. 2 to Fig. The mounting device 20, which has three elements as described above, now includes a first mounting element 21. This first mounting element 21 has a Y-shaped form.

[0062] The fork-like area of ​​the first retaining element 21 is formed by a first finger 22 and a second finger 23 which runs essentially parallel to it.

[0063] The fork-like section is designed in such a way that the [unclear] in the Fig. 1, Fig. 2 to Fig. 3 described arrangement of the second retaining element 1, the decoupling element 5, the reinforcing disc 9, the sleeve 6 and the fixing disc 5 can be inserted precisely between the first finger 22 and the second finger 23.

[0064] The first retaining element 21 is essentially formed from a sheet metal strip which is deflected from its main plane 29 by two introduced bends. The finger 22 runs essentially parallel to the main plane 29 of the first retaining element 21.

[0065] The first finger 22 has a first opening 25. The second finger 23 has a second opening 26, which in the view of the Fig. 4 is covered. A connecting screw 24 is guided through the first opening 25 and the bore 7 of the sleeve 6 and is fixed to the back of the second finger 23 by means of the nut 27. By using a connecting screw 24 and a nut 27, the clamping force acting on the first finger 22, the second finger 23, and the elements arranged between them can be varied. The assembly of the second retaining element 2 and the first retaining element 21 is particularly easy due to the use of a screw connection.

[0066] In alternative embodiments, a different joining method can be used instead of a connecting screw. For example, a rivet can be used instead of the connecting screw.

[0067] The first opening 25 and the second opening 26 are each formed by an elongated hole. These elongated holes allow adjustment of the first retaining element 21 relative to the elements arranged between them. In this way, tolerance compensation or length compensation can be achieved.

[0068] The second finger 23 is formed by a second sheet metal strip, which is connected to the first sheet metal strip below the fork-like area. In the illustrated embodiment, the second sheet metal strip runs in a straight line. Known joining methods, such as welding, gluing, or soldering, can be used to connect the first and second sheet metal strips.

[0069] The Fig. 5 shows a side view of the already in Fig. The mounting device 20 shown in Figure 4 is shown in the side view. The connecting screw 24 is guided through the first retaining element 21, the second retaining element 1, the decoupling element 4, the sleeve 6, the reinforcing washer 9, and the fixing washer 5. The first retaining element 21 can be rotated relative to the second retaining element 1 at any time by loosening the screw connection. This allows, for example, easy final assembly on the internal combustion engine or in the vehicle. The connecting screw 24 and the nut 27 can be easily loosened or tightened during assembly.

[0070] The Fig. Figure 6 shows a cross-sectional view of the previously shown Fig. 5. From Fig. Figure 6 shows the assembly of the connection point between the second retaining element 1 and the first retaining element 21. Starting from the left, the connecting screw 4 is followed by a washer 30, then the first finger 22 of the first retaining element 21. Next comes the sleeve 6 and the first part 4a of the decoupling element 4, followed by the second retaining element 1 and the reinforcing washer 9, then the second part 4b of the decoupling element 4 and the locking washer 5. The locking washer 5 is followed by the second finger 23 and finally the nut 27.

[0071] In Fig. Figure 6 shows that there is no direct physical contact between the second retaining element 1 and the first retaining element 21. All force transmissions from the first retaining element 21 to the second retaining element 1, or vice versa, occur via the decoupling element 4.

[0072] On average, the Fig. Figure 6 shows the first opening 25 and the second opening 26. The elongated shape of the first opening 25 and the second opening 26 allows for a relative displacement of the first retaining element 21 with respect to the rest of the arrangement.

[0073] In the Fig. The central axis 28 forms the central axis for all openings and bores. Both the sleeve 6 and the channel inside the decoupling element 4 run concentrically to the central axis 28. The same applies to the third opening of the second retaining element 1 and the bore in the fixing disc 5.

[0074] In alternative embodiments, this concentric alignment of the individual elements relative to each other can also be deviated from.

[0075] The dividing line 10 of the decoupling element 4 runs in line with the dividing line between the second retaining element 1 and the reinforcing disc 9. This can also be provided differently in alternative embodiments, particularly if a reinforcing disc is omitted.

[0076] The in the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. The decoupling element 4 shown in Figure 7 is advantageously designed as a wire mesh. The advantage of a wire mesh is, in particular, its higher temperature resistance compared to, for example, elastomer elements. Especially when used in a mounting device for an exhaust gas turbocharger, the installation position within the vehicle is likely to be near exhaust gas lines or the combustion engine. Therefore, elevated temperatures are to be expected, which can negatively affect the long-term durability of elastomer elements. Furthermore, wire meshes can exhibit higher strength than comparable elastomer elements.

[0077] The Fig. Figure 7 shows another side view of the mounting device 20, as shown in the preceding figures. Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 to Fig.6 has already been described. The viewer's gaze is directed towards the first finger 22, which lies in the plane of the paper.

[0078] The designs shown in the figures are not restrictive. Reference symbol list 1 Second retaining element 2 First thigh 3 Second thigh 4, 4a, 4b Decoupling element 5 slices 6 sleeve 7 bore 8a, 8b Intake area exhaust gas turbocharger 9 Reinforcing disc 10 Dividing line 11 Inner wall third opening 12 Inner wall sleeve 13 Inner wall of channel 20 Mounting device 21 First retaining element 22 First finger 23 Second finger 24 Connecting screw 25 First opening 26 Second opening 27 Mother 28 Central axis 29 Level 30 Washers

Claims

Mounting device (20) for attaching an exhaust gas turbocharger to an internal combustion engine, comprising a first mounting element (21) which is associated with the internal combustion engine as a mounting point and a second mounting element (1) which is associated with the exhaust gas turbocharger, wherein the first mounting element (21) is connected to the second mounting element (1) along an axis via a connecting means (24), wherein a decoupling element (4, 4a, 4b) is arranged between the first mounting element (21) and the second mounting element (1), which at least partially comprises at least one of the mounting elements (1, 21), wherein the decoupling element (4, 4a, 4b) is designed in two parts, wherein the decoupling element (4, 4a, 4b) is formed from a wire mesh, characterized in that the first mounting element (21) has a substantially Y-shaped form, wherein a fork-like region of the Y-shaped form is formed by a first finger (22) and a second finger (23),wherein the fingers (22, 23) are substantially parallel to each other, the fork-like region forming an end region facing away from the internal combustion engine, the first finger (22) having a first opening (25) and the second finger (23) having a second opening (26), the first opening (25) and the second opening (26) being in alignment. Mounting device (20) according to claim 1, characterized in that the second mounting element (1) has a substantially U-shaped form, wherein an end region facing away from the exhaust gas turbocharger is located in the region of a vertex of the U-shaped form and a third opening is arranged in the vertex. Holding device (20) according to claim 2, characterized in that the second holding element (1) has a reinforcing means (9) in the area of ​​the third opening which increases the material thickness of the second holding element (1) by the third opening. Mounting device (20) according to one of the preceding claims, characterized in that the decoupling element (4, 4a, 4b) engages in the third opening of the second mounting element (1). Mounting device (20) according to one of the preceding claims, characterized in that the decoupling element (4, 4a, 4b) has a first channel which completely penetrates the decoupling element (4, 4a, 4b). Mounting device (20) according to one of the preceding claims, characterized in that the decoupling element (4, 4a, 4b) and the second holding element (1) are enclosed by a fixing element (6, 5). Mounting device (20) according to one of the preceding claims, characterized in that a preload force can be generated by the connecting means (24) by which the elements of the mounting device (20) can be connected to each other and fixed to each other. Mounting device (20) according to one of the preceding claims, characterized in that the connecting means (24) is formed by a screw connection (24, 27).

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