Holding device for exhaust gas system of internal combustion engine and method for producing same
By constructing a hollow part in the retaining device bolt part of the internal combustion engine exhaust gas equipment, the material is hardened faster and evenly, the problem of insufficient mechanical strength of the existing equipment is solved, and higher structural stability and mechanical strength are achieved.
Patent Information
- Application Number
- CN202411412724.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-10-11
- Filing Date
- 2024-10-11
- Publication Date
- 2025-04-11
AI Technical Summary
The existing internal combustion engine exhaust gas equipment retaining devices have insufficient mechanical strength, resulting in problems such as structural instability and ineffective mechanical load during vehicle operation.
By constructing the plug-in void in the retaining device plug, an unfilled volume area is formed on at least one circumferential area to promote faster and more uniform hardening of the structured material and improve the structural strength of the material.
The higher mechanical strength and structural stability of the device are achieved, and can more effectively resist the mechanical load generated during vehicle operation and extend the service life of the equipment.
Smart Images
Figure CN119801710A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a holding device which can be used to hold an exhaust system of an internal combustion engine on a vehicle. Background Art
[0002] This holding device 10 is Figure 1 1 is shown in a perspective view. The holding device 10, which is usually manufactured as an aluminum die casting, comprises a holding device body 12, which has a substantially plate-shaped holding device bottom 14 and a holding device wall 16 extending approximately orthogonally away from the holding device bottom along the peripheral area of the bottom 14. In the central area of the holding device bottom 14, a fastening member through-hole 18 is provided, through which a fastening member, for example, in the form of a screw or the like, can be guided in order to fix the holding device 10 in the area of the lower floor of a vehicle, for example. In order to ensure a defined positioning of the holding device 10, for example, an anti-rotation projection 22 can be provided on the tab 20 protruding from the bottom 14, which anti-rotation projection can be positioned so as to engage in an associated opening, for example, in the area of the lower floor and thus can hold the holding device 10 against rotation about the fastening member passing through the fastening member through-hole 18.
[0003] The holder wall 16 has a variable wall height in the circumferential direction starting from the holder base 14. In the region of the maximum wall height, a holder bolt 24 is arranged on the outer side of the holder wall 16, which extends away from the holder wall 16 approximately orthogonally with respect to the extension direction of the holder wall 16 away from the holder base 14. The holder bolt 24 is connected to the outer side of the holder wall 16 with a first end region 26 and has an approximately constant, for example approximately circular, cross-sectional geometry in the direction of the bolt axis Z. A bolt head 30 is arranged at a second end region 28 of the holder bolt 24, which is designed larger with respect to the outer dimensions of the holder bolt 24.
[0004] Two reinforcing projections 32, 34 ensure increased stability, which are arranged on the inside of the holder wall 16 in the region where the holder bolt 24 is connected on the outside of the holder wall 16. These reinforcing projections extend from the holder base 14 approximately parallel to one another along the inside of the holder wall 16 and form between themselves a recess 36 which is open inwards, i.e. towards the fastening element through-opening 18. The reinforcing projections 32, 34 are positioned on the holder wall 16 so that on the outside of the holder wall 16 the holder bolt 14 is arranged approximately between these reinforcing projections or overlapping with them, and the bolt longitudinal axis Z extends between the reinforcing projections 32, 34 through the recess 36.
[0005] For example, an elastic suspension element made of a rubber-like material can be supported by the holding device bolt 24 , which can also be suspended on a corresponding holding device of the exhaust system and can thus elastically support the exhaust system relative to the holding device 10 and thus also relative to the associated vehicle.
[0006] The holding device 10 with the holding device body 12 and the holding device bolt 24 is produced, for example, from an aluminum material by die casting. Figure 2 a) and Figure 2 b) The curing behavior of the material of the holding device 10 introduced into the injection mold in the liquid state is shown by calculation using a model.
[0007] Figure 2 a) shows the hardening state about 2.4 s after the start of the die-casting process. It can be seen that the material of construction of the holder 10 has hardened to the greatest extent. Only in the region of the holder pin 24 and in particular in the region where the holder pin 24 is connected to the holder wall 16 is there a core region indicated by 38 in which the material of construction of the holder 10 has not yet hardened.
[0008] About 2.9s after the die casting process starts, Figure 2 b), such an unhardened core region 38 remains only where the first end region 26 of the holder pin 24 adjoins the holder wall 16. Since in this state no further liquid construction material is introduced into the injection mold, the delayed hardening of the construction material of the holder 10 leads to a relatively porous, unstable material structure, in particular in the transition region between the holder pin 24 and the holder wall 16, which is subject to strong mechanical loads. Summary of the invention
[0009] The object of the present invention is to provide a mounting device for an exhaust system of an internal combustion engine which has increased mechanical strength.
[0010] According to the invention, this object is achieved by a holding device for an exhaust system of an internal combustion engine, the holding device comprising:
[0011] a holder body having a holder bottom and a holder wall extending from the holder bottom,
[0012] a retaining device bolt portion, the retaining device bolt portion extending from the outer side of the retaining device wall portion,
[0013] In this case, a bolt recess is formed in the holding device bolt over at least one circumferential region.
[0014] By configuring the retaining device bolt such that it has a bolt recess in at least one circumferential region, a volume region is created within the outer circumferential contour of the retaining device bolt that is not filled with the retaining device bolt construction material, which leads to a faster and more uniform hardening of the flowable construction material used to produce the retaining device. The creation of regions that could be weakened due to the material structure can thus be avoided.
[0015] In the holding device according to the invention, the holding device bottom can be designed substantially in the form of a plate. In order to fix the holding device in the region of the lower floor of a vehicle, for example, a fastening member through hole can be provided in the holding device bottom. In addition, an anti-rotation projection extending in the opposite direction to the extension direction of the holding device wall with respect to the holding device bottom can be provided on the holding device bottom, so that the holding device can be locked in a defined position, for example, in the region of the lower floor of a vehicle.
[0016] The high stability of the retaining device can be assisted, for example, by the fact that the retaining device wall extends at least partially along a peripheral area of the retaining device bottom and / or the retaining device wall is annularly configured substantially without interruption and / or the retaining device wall has a varying wall height starting from the retaining device bottom.
[0017] Since an important function of the holder wall is also the connection of the holder pin to the holder body, it is furthermore provided that the holder pin is arranged on the holder wall in the region of the maximum wall height.
[0018] In order to increase the stability of the holding device, at least one reinforcing projection connected to the holding device base can be provided on the inner side of the holding device wall.
[0019] It is particularly advantageous with regard to the rigidity of the retaining device if two reinforcing protrusions arranged at a distance from one another are provided on the inner side of the retaining device wall, wherein the retaining device bolt is connected to the retaining device wall on the outer side of the retaining device wall approximately between the two reinforcing protrusions and / or overlapping with at least one reinforcing protrusion.
[0020] At least one reinforcing projection can be rib-shaped. It can also be provided that at least one reinforcing projection transitions into a wall region of the retaining device wall, which wall region has an increasing wall thickness that decreases in the direction away from the reinforcing projection. As a result, adjacent to such a reinforcing projection, a larger volume region is created that is filled with the retaining device construction material, which influences the curing properties of the retaining device construction material in such a way that, in particular, the construction material present in the transition region between the retaining device bolt and the retaining device wall cures with a high structural strength before curing begins in the wall region with the increased thickness.
[0021] Since the transition between the retaining device wall and the retaining device bolt is critical with regard to the structural strength of the retaining device, it is particularly advantageous if the bolt recess in the retaining device bolt is constructed at least in the first end region of the retaining device bolt connected to the retaining device wall.
[0022] The holding device bolt can be designed to extend in the direction of the bolt longitudinal axis, and the bolt recess can be designed to be open radially outwards in the holding bolt extending in the direction of the bolt longitudinal axis for simple execution of the injection molding process.
[0023] In order to enable a secure interaction of the holder with a rubber-elastic suspension element, for example, for an exhaust system, a bolt head which protrudes relative to the outer dimensions of the holder bolt can be provided at the second end region of the holder bolt facing away from the holder wall. In this case, for a rapid and uniform hardening of the construction material of the holder, in particular in the region of the holder bolt, it is particularly advantageous if the bolt recess extends as far as the bolt head.
[0024] The influence on the hardening properties of the construction material of the holding device introduced by providing the bolt recess can be used particularly effectively if the recess depth of the bolt recess in the recess depth direction is at least 30%, preferably at least 50%, of the cross-sectional dimension of the holding device bolt.
[0025] In order to ensure a stable construction that is nevertheless economically feasible, it is proposed that the holder body and the holder bolt are designed integrally as a die-cast part, preferably made of aluminum. It should be pointed out that the term "integrally" means that all components of the holder are provided as one piece of material in one working process, rather than being manufactured as a plurality of individual components and then assembled.
[0026] The invention also relates to a method for producing a mounting device for an exhaust system of an internal combustion engine designed according to the invention. In the method, the mounting device body is produced in one piece as a die-casting, preferably made of aluminum. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The present invention is described below with reference to the accompanying drawings.
[0028] Figure 1 A holding device for an exhaust system of an internal combustion engine is shown in a perspective view;
[0029] Figure 2 The diagrams a) and b) show the production process in a die casting process. Figure 1 The hardening characteristics of the retaining device;
[0030] Figure 3The corresponding embodiment of the holding device constructed according to the present invention is shown. Figure 1 pictorial diagram;
[0031] Figure 4 The diagrams a) and b) show the production process in a die casting process. Figure 3 The hardening characteristics of the retaining device;
[0032] Figure 5 The corresponding embodiment of the holding device constructed according to the present invention is shown. Figure 1 pictorial diagram;
[0033] Figure 6 The diagrams a) and b) show the production process in a die casting process. Figure 5 The hardening characteristics of the retaining device;
[0034] Figure 7 Show Figure 3 A cross-sectional view of a retaining device bolt portion of a retaining device; DETAILED DESCRIPTION
[0035] Refer to the following Figures 3 to 7 Different embodiments of the holding device according to the invention are described. These embodiments correspond to the above-mentioned embodiments in terms of their basic structure, that is, in terms of the embodiment of the holding device 10 with the holding device body 12 and the holding device bolt 24 extending away from the holding device wall 16. Figure 1 The structure has been described. Therefore, for this basic structure, refer to Figure 1 The aforementioned implementation scheme.
[0036] exist Figure 3 2, it can be seen that a bolt recess, which is generally designated by 40, is formed in the holder bolt 24. The bolt recess 40 extends from the first end region 26, i.e., from the region where the holder bolt 24 is connected to the holder wall 16, approximately in a straight line in the direction of the bolt longitudinal axis Z to the bolt head 30. The bolt recess 40 is open radially outwards relative to the bolt longitudinal axis Z and preferably has a cross-sectional geometry that remains approximately constant in the direction of the bolt longitudinal axis Z.
[0037] Figure 7 It is noted that the bolt portion recess 40 is in the recess depth direction R T The depth T is greater than the depth of the retaining device bolt 24 in the recess depth direction R in the illustrated design example. T Half of the cross-sectional dimension D.
[0038] By providing the bolt recess 40, a relatively large volume that is not filled with the material of the holding device 10 or is to be filled during the die-casting process is present in the cross section of the holding device bolt 24. The volume of the bolt recess 40 that cannot be filled with the material of the holding device 10 significantly influences the hardening properties of the material of the holding device 10 during the die-casting process.
[0039] Figure 4 a) and 4b) are similar to Figure 2 2a) and 2b) show the hardening properties of the material of construction of the holding device 10 ascertained on the basis of model calculations. Figure 4 In the state shown in a), which is present approximately 2.4 seconds after the start of the die-casting process, the material of construction of the holder 10 has not yet hardened substantially only in the relatively small core region 38, wherein the core region 38 is also located at the point where the holder bolt 24 is connected to the holder wall 16. Figure 4 After about 2.9 seconds as shown in b), the material of construction of the holder 10 introduced into the die casting mold has completely hardened. No core region remains in which hardening properties exist that lead to a different material structure. In particular, the volume region of the later hardened material of construction of the holder 10 in which the holder bolt 24 is connected to the holder wall 16 is hardened with a homogeneous, very stable material structure. Figure 1 Compared to the design example shown in , a more stable structure of the holding device 10 is achieved that resists mechanical loads occurring during vehicle operation, despite the fact that the holding device bolt 24 is less strong due to the provision of the bolt recess 40 and is constructed with less material.
[0040] exist Figure 5 4 shows an alternative embodiment of a holding device bolt 24 with a bolt recess 40. The holding device bolt 24 has approximately the same Figure 3 . However, adjacent to the reinforcing projection 34 there is a wall region 42 of the retaining device wall 16 in which the retaining device wall 16 has a greater wall thickness than in other regions located in the circumferential direction around the retaining device bottom 14. For example, where the reinforcing projection 34 transitions into this region 42 of the retaining device wall 16, the retaining device wall 16 has a thickness which is equal to the wall thickness existing in other regions of the retaining device wall 16 plus the height of the reinforcing projection 34. The wall thickness of the retaining device wall 16 decreases in the direction away from the reinforcing projection 34, so that also with the decreasing protrusion height of the retaining device wall 16 from the retaining device bottom 14, the retaining device wall 16 approximately Figure 5 The structure shown in the lower region of , has a small protruding height from the holding device base 14 and an approximately constant small wall thickness.
[0041] Figure 6 It is shown that by providing a wall region 42 of the holder wall 16 beside the region of the holder wall 16 to which the holder bolt 24 is connected, a core region 38' is retained during the die-casting process when the structural material of the holder 10 is hardened, in which core region the structural material has not yet hardened approximately 2.4 seconds after the start of the die-casting process. As a result, the volume region of the structural material that has not yet hardened moves away from the volume region where the holder bolt 24 is connected to the holder wall 16. This also contributes to a more uniform hardening behavior in the volume region where the holder bolt 24 is connected to the holder wall 16.
Claims
1. A holding device for an exhaust gas device of an internal combustion engine, the holding device comprising: a retaining device body (12), the retaining device body having a retaining device bottom (14) and a retaining device wall (16) extending from the retaining device bottom (14), a retaining device bolt portion (24), the retaining device bolt portion extending from the outer side of the retaining device wall portion (16), A bolt recess (40) is formed in the holding device bolt (24) over at least one circumferential region.
2. The holding device according to claim 1, characterized in that The retaining device bottom (14) is substantially plate-shaped, and / or a fastening member through hole (18) is provided in the retaining device bottom (14), and / or an anti-rotation protrusion (22) is provided on the retaining device bottom (14), wherein the anti-rotation protrusion extends in an opposite direction relative to the extension direction of the retaining device wall portion (16) and relative to the retaining device bottom (14).
3. The holding device according to claim 1 or 2, characterized in that: The retaining device wall (16) extends at least partially along a peripheral area of the retaining device bottom (14), and / or the retaining device wall (16) is designed to be annular and substantially uninterrupted, and / or the retaining device wall (16) has a varying wall height starting from the retaining device bottom (14).
4. The holding device according to claim 3, characterized in that: The holding device bolt (24) is arranged on the holding device wall (16) in the region of the maximum wall height.
5. The holding device according to any one of claims 1 to 4, characterized in that At least one reinforcing projection (32, 34) connected to the holder bottom (14) is arranged on the inner side of the holder wall (16).
6. The holding device according to claim 5, characterized in that Two reinforcing projections (32, 34) are arranged at a distance from each other on the inner side of the retaining device wall (16), wherein the retaining device bolt (24) is connected to the retaining device wall (16) on the outer side of the retaining device wall (16) approximately between the two reinforcing projections (32, 34) and / or overlapping with at least one reinforcing projection (32, 34).
7. The holding device according to claim 5 or 6, characterized in that: At least one reinforcing projection (32, 34) is rib-shaped and / or at least one reinforcing projection (34) transitions into a wall region (42) of the retaining device wall (16), which has a wall thickness that increases and decreases in a direction away from the reinforcing projection (34).
8. The holding device according to any one of claims 1 to 7, characterized in that The bolt recess (40) is formed in the holder bolt (24) at least in a first end region (26) of the holder bolt (24) which adjoins the holder wall (16).
9. The holding device according to any one of claims 1 to 8, characterized in that The holding device bolt (24) extends in the direction of a bolt longitudinal axis (Z), and the bolt recess (40) is designed to be open radially outward in the holding device bolt (24) and extends in the direction of the bolt longitudinal axis (Z).
10. The holding device according to any one of claims 1 to 9, characterized in that A bolt head (30) is provided at a second end region (28) of the holding device bolt (24) remote from the holding device wall (16) and protrudes relative to the outer dimensions of the holding device bolt (24), and the bolt recess (40) extends as far as the bolt head (30).
11. The holding device according to any one of claims 1 to 10, characterized in that The recess depth (T) of the bolt recess (40) is the depth of the bolt (24) of the retaining device in the recess depth direction (R T ) at least 30%, preferably at least 50%, of the cross-sectional dimension (D) on the surface.
12. The holding device according to claim 1, characterized in that The holding device body (12) and the holding device bolt (24) are designed integrally as a die-cast part, preferably made of aluminum.
13. A method for producing a retaining device (10) for an exhaust system of an internal combustion engine according to any one of claims 1 to 12, wherein: The holding device body (12) is produced in one piece as a die-cast part, preferably made of aluminum.