Component for an injection device and injection device for a mixed compression, externally ignited internal combustion engine and method for manufacturing such a component

Abstract

Component (3), in particular fluid distributor (2), for a injection device (1) of a compression, externally ignited internal combustion engine, which is used for dispensing fluid under high pressure, has a base body (14) and at least one connecting stub (16A-19A) configured on the base body (14), which is used for connecting an injection valve (7-10), wherein the injection valve (7-10) can be introduced into a receiving space (27-30) of the connecting stub (16A-19A) along an installation axis (40-43) in the installed state, wherein at least the base body (14) and the connecting stub (46-49) are configured by one or more levels of forging, and wherein a recess (51, 51') is configured on the outside (52, 52') of the connecting stub (46-49), into which, in the installed state, an orientation element (50) of the injection valve (7-10) is inserted in order to limit the rotational freedom of the injection valve (7-10) about the installation axis (40-43). Preferably, it is proposed that the connecting stub (16A-19A) is reworked after the forging in such a way that at least one side (56, 57, 56', 57') of the recess (51, 51') of the connecting stub (16A-19A) is configured at least approximately with a predefined lateral height (58) in order to limit the rotational freedom about the installation axis (40-43) in a selected rotational direction (49) in the installed state, a contact between the orientation element (50) of the injection valve (7-10) and the connecting stub (16A-19A) is achieved. Furthermore, an injection device having such a component (3) and a method for producing such a component (3) are given.

Description

Technical Field

[0001] This invention relates to a component, particularly a fuel distributor, for use in an injection device for a hybrid compression external ignition internal combustion engine. Specifically, this invention relates to the field of injection devices for motor vehicles, in which fuel is directly injected into the combustion space of the internal combustion engine. Background Technology

[0002] A fuel dispenser with a pressure storage tube is known from DE 10 2018 110 342 A1, wherein the pressure storage tube has a forged base. A flange is provided on the base, the flange being integrally constructed on the base by forging of the same material and having an installation opening. Summary of the Invention

[0003] According to the present invention, a component, particularly a fluid distributor, is provided for an injection device of a mixed-compression externally ignited internal combustion engine. The component is used to dispense fluid under high pressure. The component has a base and at least one connecting short tube constructed on the base for connecting an injection valve. The injection valve, when installed, can be inserted along an installation axis into a receiving space of the connecting short tube. At least the base and the connecting short tube are constructed by one or more stages of forging. A groove is formed on the outer side of the connecting short tube. In the installed state, to restrict the rotational freedom of the injection valve about the installation axis, an orientation element of the injection valve is embedded in the groove. The connecting short tube is further processed after forging such that at least one side of the groove of the connecting short tube is configured to have at least approximately a predetermined lateral height. In the installed state, to restrict the rotational freedom about the installation axis in a selected rotational direction, contact between the orientation element of the injection valve and the connecting short tube can be achieved on the at least one side.

[0004] According to the present invention, an injection device for a hybrid compression external ignition internal combustion engine is provided, the injection device being used to inject a fluid, the fluid being a fuel, particularly gasoline and / or ethanol, and / or a mixture having the fuel, the injection device having components according to the present invention.

[0005] According to the present invention, a method for manufacturing a component according to the invention is provided, wherein, after forging, the connecting short tube is further processed such that at least one side of the groove of the connecting short tube is configured to have at least approximately a predetermined lateral height, so that, in the installed state, contact between the orientation element of the injection valve and the connecting short tube can be achieved on the at least one side in order to restrict the degree of rotational freedom about the mounting axis in a selected rotational direction.

[0006] The components according to the invention, the spraying device according to the invention, and the method according to the invention have the advantage of achieving an improved configuration and operating principle.

[0007] Advantageous extensions of the components, spraying devices, and methods described in this invention are possible due to the measures listed in the preferred embodiments.

[0008] The injection device according to the invention is used in a mixed-compression externally ignited internal combustion engine. The injection device according to the invention is used for injecting gasoline and / or ethanol and / or similar fuels and / or for injecting mixtures containing gasoline and / or ethanol and / or similar fuels. The mixture may involve, for example, a mixture with water. Components according to the invention are used in such injection devices.

[0009] At least the base of the component is constructed of a material preferably high-quality steel, especially austenitic high-quality steel. In particular, this material can be based on austenitic stainless steel having material numbers 1.4301 or 1.4307, or on similar high-quality steel. Specifically, austenitic steels having material numbers 1.4301, 1.4306, 1.4307, and 1.4404 can be used. The hydraulic fittings disposed on the base can be configured as high-pressure input terminals, high-pressure output terminals, or other high-pressure fittings, respectively. Preferably, the base, together with the high-pressure input terminal, at least one high-pressure input terminal implemented on the connecting short pipe, and, if necessary, one or more other high-pressure fittings, are formed into a forged blank during manufacturing and further processed.

[0010] Therefore, the proposed fuel distributor configuration presents a significant difference from brazed rails, where the tubing used for brazing is machined and deburred before welding the components. A forged configuration, in particular, allows for a design suitable for higher pressures. A key difference from high-pressure rails used in self-igniting internal combustion engines lies in the choice of materials and processing, especially the forging of high-quality steel.

[0011] By re-processing the connecting short tube after forging, a constant lateral height can be advantageously achieved on the connecting short tubes of multiple components. In particular, an advantageous extension can be implemented here, wherein the other side of the groove of the connecting short tube facing the groove is configured to have at least approximately a predetermined lateral height, and in the installed state, contact between the orientation element of the injection valve and the connecting short tube can be achieved on this other side to restrict rotational freedom opposite to the selected rotational direction. Specifically, the lateral height can be predetermined such that a minimum height necessary for restricting at least one rotational degree of freedom is achieved. If necessary, the predetermined lateral height can be uniformly achieved on multiple connecting short tubes of the component. This is advantageous, for example, in an extended embodiment, wherein at least one additional connecting short tube is provided for connecting an additional injection valve, wherein the additional injection valve, during installation, can be inserted into the receiving space of the additional connecting short tube along an additional mounting axis, wherein at least the base, the connecting short tube, and the additional connecting short tube are constructed of one or more stages of forging, and wherein a groove is formed on the outer side of the additional connecting short tube, wherein, in the installed state, in order to restrict the rotational freedom of the additional injection valve about the additional mounting axis, an orientation element of the additional injection valve is embedded in the groove, and, after forging, the additional connecting short tube is further processed such that at least one side of the groove of the additional connecting short tube is configured to have at least approximately a predetermined lateral height, wherein, in the installed state, in order to restrict the rotational freedom about the additional mounting axis in a selected rotational direction, contact between the orientation element of the additional injection valve and the additional connecting short tube can be achieved on the at least one side. In mass production, a pre-defined lateral height, at least as large as the minimum height, can be uniformly pre-defined across a large number of components. After forging, tolerance-dependent fluctuations in component dimensions occur on individual connecting tubes and on connecting tubes of different components, and therefore, deviations occur particularly between the geometries of the connecting tubes. Post-forging re-machining is preferably performed in a way that achieves a constant configuration of the sidewalls of the grooves in the connecting tubes. In the proposed configuration, simplified machining can be achieved by deburring to meet functional requirements, while reducing start-up costs, correction costs, and measurement costs.

[0012] Here, variations in the geometry of a single connecting short tube can be advantageously achieved through variable-sized edge cutting. This is particularly possible in an advantageous extension where the groove transitions onto the outer side of the connecting short tube at an edge, the edge being constructed as a machined edge, and the machining of the edge is performed such that the side surface, or the other side surface, is configured to at least approximately have a pre-given lateral height. Here, reprocessing can be based on functional and tolerance analysis to ensure the necessary functionality and to cover component dimensional variations due to tolerances.

[0013] The resulting edge geometry and / or dimensions can then vary depending on deviations in the outer contour of the component. Because the design criteria for machining ensure the necessary functional surfaces on the sides, deviations in the geometry of the connecting stubs between multiple fluid distributors in mass production result in different edge geometries. Therefore, it is advantageously extended that the machined edge is constructed as at least partially inclined and / or at least partially rounded edges. Advantageously, the machined edge has at least partially varying edge geometry along its direction, particularly at least partially varying edge height. Advantageously, after forging, the connecting stub is re-machined such that, during this re-machined process, the edge geometry, particularly the edge height, is changed such that the side or other side configuration has at least approximately a pre-given lateral height. Particularly advantageous is that at least one side and edge are machined with a single tool in a single process step, wherein, after the forging, the connecting stub is further processed such that the groove and the edge are configured to share a common tool geometry. However, in a modified configuration, the side and edge can also be machined separately with a single tool. Attached Figure Description

[0014] Preferred embodiments of the invention will be explained in more detail in the following description with reference to the accompanying drawings, in which corresponding elements are given consistent reference numerals. The drawings show:

[0015] Figure 1 A schematic cross-sectional view illustrates an injection device for a hybrid compression externally ignited internal combustion engine, corresponding to one embodiment of the invention, the injection device having components configured as a fuel distributor;

[0016] Figure 2 The components corresponding to this embodiment are shown in detailed schematic diagrams. Figure 1 The local area marked with II in the middle;

[0017] Figure 3 The embodiments of the present invention are shown in Figure 2 Details of the connecting short tube of the component shown;

[0018] Figure 4 The illustration shows, in contrast to other conceivable reprocessing methods, the process along the... Figure 2 The cross-section marked IV passes through the groove connecting the short tube to illustrate embodiments of the invention.

[0019] Figure 5A and 5B Shown in Figure 1 The schematic, summary diagrams of the connecting short tubes of the illustrated components and other connecting short tubes are provided to explain possible configurations of the invention. Detailed Implementation

[0020] Figure 1 A schematic cross-sectional view of an injection device 1 with a fuel distributor (fluid distributor) 2, corresponding to the first embodiment, is shown. In this embodiment, the fuel distributor 2 of the fuel injection device 1 is component 3 corresponding to the construction of the present invention. Furthermore, a high-pressure pump 4 is provided. The high-pressure pump 4 is connected to the fuel distributor 2 via a fuel pipe 5 configured as a high-pressure pipe 5. During operation, fuel or a mixture containing fuel is supplied as a fluid to the input terminal 6 of the high-pressure pump 4.

[0021] Fuel distributor 2 is used to store fluid and distribute the fluid to the injection valves 7 to 10, which are configured as fuel injection valves 7 to 10, and to reduce pressure fluctuations and pulsations. Fuel distributor 2 can also be used to reduce pressure pulsations that may occur when the fuel injection valves 7 to 10 switch. During operation, high pressure p may occur, at least temporarily, in the internal space 11 of component 3.

[0022] The fuel distributor 2 has a tubular base 14, which is constructed using a single or multi-stage forging process. The component 3 has the tubular base 14, a high-pressure input end 15, and multiple hydraulic connectors 16 to 19 configured as high-pressure output ends 16 to 19, all mounted on the tubular base. Furthermore, a pressure sensor connector 20 is provided on the tubular base 14. In this embodiment, the tubular base 14, the high-pressure input end 15, the connecting short pipes 16A to 19A for the high-pressure output ends 16 to 19, and the pressure sensor connector 20 are all constructed from a single forged piece 14'. Therefore, the high-pressure input end 15, the connecting short pipes 16A to 19A for the high-pressure output ends 16 to 19, and the pressure sensor connector 20 are forged onto the base 14.

[0023] Fuel injectors 7 to 10 are respectively connected to the high-pressure output terminals 16 to 19 of the fuel distributor 2. Additionally, a pressure sensor 21 is provided connected to the pressure sensor connector 20. At end 22, the tubular base 14 is locked by a locking element 23 configured as a locking screw 23 in this embodiment. Here, end 22 of the tubular base 14 can be configured as a threaded short pipe 22A. In a modified configuration, an axial high-pressure input terminal can be provided at end 22 or at one end 24 instead of the radial high-pressure input terminal 15.

[0024] After forging, the tubular base 14, or the forged single piece 14', is machined by at least one cutting process. In this embodiment, after forging, a drilled hole 25 is also formed in the tubular base 14 to create an internal space 11. During operation, fluid supplied at the high-pressure input 15 can be distributed through the internal space 11 to fuel injection valves 7 to 10 connected to the high-pressure outputs 16 to 19.

[0025] Furthermore, boreholes 26 to 31 are introduced into the forged single piece 14' by machining. Here, boreholes 27 to 30 serve as connection boreholes 27 to 30 for the high-pressure output terminals 16 to 19. Borehole 26 is used for the high-pressure input terminal 15. Borehole 31 is used for the pressure sensor connector 20. In addition, internal threads 22B are etched into borehole 25 on the end 22 of the base 14, thereby forming a threaded connection short pipe 22A.

[0026] Furthermore, boreholes 32 to 37 can be provided on the connecting short pipes 16A to 19A of the high-pressure input terminal 15 and the high-pressure output terminals 16 to 19, and on the pressure sensor connector 20. In this embodiment, borehole 25 is oriented axially relative to the longitudinal axis 38. In this embodiment, boreholes 32 to 37 are oriented radially relative to the longitudinal axis 38. The outer side 39 of the base 14 can be based on a basic cylindrical shell shape.

[0027] exist Figure 1 In the schematic diagram, boreholes 33 to 36 are radially oriented relative to the longitudinal axis 38. In a possible configuration of the invention, boreholes 33 to 36 are preferably radially or radially eccentrically oriented relative to the longitudinal axis 38. The boreholes 33 to 36 connecting the short pipes 16A to 19A pre-determine the mounting axes 40 to 43 for the injection valves 7 to 10. Mounting axes 40 to 43 are preferably radially or radially eccentrically oriented relative to the longitudinal axis 38.

[0028] Figure 2 The component 3 corresponding to this embodiment is shown in detailed schematic diagrams. Figure 1The portion is marked with II. Here, the connecting short pipe 16A of the injection valve 7 and the high-pressure output terminal 16 is selected to exemplarily represent the connecting short pipes 16A to 19A of the injection valves 7 to 10 and the high-pressure output terminals 16 to 19. The injection valve 7 has an inlet branch pipe 45, which, during installation, is inserted into the drilled hole 33 of the connecting short pipe 16A along the installation axis 40 and the installation direction 46. Figure 1 In this configuration, the injection valve 7, in its installed state, is held against a cylinder head (not shown) by a clamping device 47 supported on the lower side 48 of the connecting short pipe 16A, opposite to the installation direction 46. Thus, the injection valve 7 is positioned and held along the installation axis 40. In principle, there are also some degrees of freedom, namely, rotational freedom in the (arbitrarily) selected rotational direction 49 and rotational freedom opposite to that direction. These rotational degrees of freedom are also restricted in the installed state. For this purpose, the orientation element 50 of the injection valve 7 is embedded in a groove 51 of the connecting short pipe 16A, which is provided on the outer side 52 of the connecting short pipe 16A. Here, the groove 51 transitions to the outer side 52 at the edge 53. Furthermore, the groove 51 is open towards the lower side 48 of the connecting short pipe 16A, such that during installation, the orientation element 50 can be embedded coaxially with the installation axis 46 in the installation direction 46 into the groove 51 of the connecting short pipe 16A. In order to reduce or completely avoid the possible gap in the rotation direction 49, in this embodiment, noses 54, 55 are constructed on the sides of the orientation element 50.

[0029] The following also refers to Figure 3 4, 5A, and 5B further illustrate the configuration and function of component 3 in the embodiments of the present invention. Figure 3 The embodiment corresponding to this is shown. Figure 2 Details of the connecting short tube 16A of component 3 are shown in the figure. Figure 4 The schematic diagram illustrates the process along the [path] in contrast to other conceivable reprocessing methods (left side). Figure 2 The cross-section marked with IV passes through the cross-section of the groove 51 of the connecting short tube 16A, to explain the embodiments of the present invention.

[0030] A first side surface 56 and a second side surface 57 are provided on the groove 51. Here, in order to restrict the rotational degree of freedom of the injection valve 7 relative to the component 3 in the rotational direction 49, contact occurs between the nose 54 and the first side surface 46. Correspondingly, in order to restrict the rotational degree of freedom opposite to the rotational direction 49, contact occurs between the nose 55 and the second side surface 57. Here, in Figure 3 The schematically drawn, pre-defined lateral height 58 is necessary to ensure reliable contact between the nose sections 54, 55 and the sides 56, 57. Figure 3 The groove 51 shown is used to process the edge 53, as shown in the figure. Figure 4It is shown intuitively in the image.

[0031] Here, Figure 4 The right side shows the processing of edge 53 corresponding to a possible configuration of the invention. Here, edge 53 is processed in such a way that a lateral height 58 is ensured at least on the first side 56 and the second side 57. And... Figure 4 The left side shows a situation in which a defined edge height of 59 is achieved, which is consistent with the proposed invention.

[0032] Figure 5A Shown in Figure 1 The schematic summary diagram of the connecting short tube 16A of the component shown is used to explain possible configurations of the invention, such as the component being disposed in the portion marked II. Because a predetermined lateral height 58 is achieved not only on the first side 56 but also on the second side 57, a variable edge height 60 is generated along the extension of the edge 53.

[0033] Figure 5B A schematic summary diagram of the connecting short pipe 19A is shown, which is exemplary selected here as being in... Figure 1 The additional connecting short tube 19A of the component in the portion marked III shown is intended to explain a possible configuration of the invention. For example, during manufacturing, especially during forging, deviations determined by tolerances may occur, in which case more material is provided on the connecting short tube 19A than on the connecting short tube 16A. This situation occurs in... Figure 4 The middle part is shown on the upper right side by means of the dotted line 61. For comparison, in Figure 4 The left side is similarly shown by dashed line 62, indicating a situation with more material, where, however, the result achieved does not conform to the present invention. Here, a groove 51' is provided on the outer side 52' of the connecting short tube 19A, which transitions to the outer side 52' on the edge 53'. The first side 56' and the second side 57' are also implemented with a predetermined lateral height 58. Thus, a variable edge height 60' is generated. Because the predetermined lateral height 58 is implemented as a target parameter, the edge 53' on the connecting short tube 19A is different from the edge 53 on the connecting short tube 16A. In particular, the variable edge heights 60, 60' along the extensions of the edges 53, 53' (at the corresponding locations) are different from each other.

[0034] As in Figure 4 As shown on the left side, when a predetermined edge height of 59 is given, the following situation occurs: the lateral heights 63 and 63' are different from each other. Furthermore, considering, for example... Figure 5AIt becomes apparent that a predetermined edge height 59 along the direction of the edge, for example in direction 64, may result in an increased lateral height along direction 64.

[0035] Therefore, in Figure 4 The measure of pre-determined edge height 59 shown on the left side may have the following consequences: not only may the lateral height of the side on a single connecting short tube be variable, for example, along direction 64, but there may also be differences in lateral height between different connecting short tubes.

[0036] For example, in one possible configuration of the invention, the predetermined lateral height 58 can be at least approximately equal to the minimum height for sides 56 and 57. And as in Figure 4 As shown on the upper left, in configurations inconsistent with the present invention, particularly during the reprocessing of edges 65, 66, the resulting lateral height 63 may be significantly lower than the minimum height, while in other cases the lateral height 63' may significantly exceed the minimum height. Such under- or over-limit conditions may also occur along direction 64 on the sides of a single connecting stub if necessary.

[0037] Therefore, the proposed reprocessing ensures the functionality of the groove 51 on the connecting short tube 16A, since the sides 56, 57, which serve as lateral stop surfaces, always have sufficient height. Taking into account variations in the external geometry of the connecting short tube 16A and manufacturing tolerances, the machining or deburring of the edge 53 can be limited such that a minimum required lateral height is always present. The thus variable dimensions of the machined edge 53, particularly the edge height 60, do not affect functionality.

[0038] Further machining of edge 53 can be performed with a suitable tool angle. Edge 53 can also have other edge geometries. For example, edge 53 can also be implemented as a rounded edge 53.

[0039] If the inner edge line 70 extends between the first side surface 56 or the second side surface 57 and the edge 53, then in the proposed configuration, the inner edge line can be continuously spaced from the bottom 71 of the groove 51 corresponding to a defined lateral height 58.

[0040] Therefore, the connecting short tube 16A is further processed after forging such that at least one side 56, 57 of the groove 51 of the connecting short tube 16A is configured with a predetermined lateral height 58, achieving contact between the orientation element 50 of the injection valve 7 and the connecting short tube 16A in the installed state on said at least one side. This is accordingly applicable to the other connecting short tubes 16A to 19A.

[0041] The present invention is not limited to the embodiments described.

Claims

1. A component for an injection device of a mixed-compression externally ignited internal combustion engine, the component being used to dispense fluid under high pressure, the component having a base and at least one connecting short pipe constructed on the base for connecting an injection valve, wherein, The injection valve, during installation, can be guided along the mounting axis into the receiving space of the connecting short pipe. At least the base body and the connecting short pipe are constructed using one or more stages of forging. Furthermore, a groove is formed on the outer side of the connecting short pipe. In the installed state, to restrict the rotational freedom of the injection valve about the mounting axis, the orientation element of the injection valve is embedded in the groove. in, After forging, the connecting short tube is further processed such that at least one side of the groove in the connecting short tube is configured with a predetermined lateral height. In the installed state, in order to restrict the degree of rotational freedom about the mounting axis in a selected rotational direction, contact between the orientation element of the injection valve and the connecting short tube can be achieved on at least one side. The groove transitions onto the outer side of the connecting short pipe at its edge, and the edge is a machined edge. The processed edge has an edge height that varies at least partially along the edge direction.

2. The component according to claim 1, Its features are, The other side of the groove of the connecting short tube facing the groove has a predetermined lateral height, and in the installed state, in order to restrict the rotational degree of freedom opposite to the selected rotational direction, contact between the orientation element of the injection valve and the connecting short tube can be achieved on the other side.

3. The component according to claim 2, Its features are, This edge processing is performed so that the side or the other side configuration has a predetermined lateral height.

4. The component according to any one of claims 1 to 3, Its features are, The processed edge configuration is an edge that is at least partially inclined and / or at least partially rounded.

5. The component according to any one of claims 1 to 3, Its features are, At least one additional connecting short tube is provided for connecting an additional injection valve, wherein the additional injection valve, during installation, can be inserted into the receiving space of the additional connecting short tube along an additional mounting axis. At least the base, the connecting short tube, and the additional connecting short tube are constructed using one or more stages of forging. A groove is formed on the outer side of the additional connecting short tube. In the installed state, to restrict the rotational freedom of the additional injection valve about the additional mounting axis, an orientation element of the additional injection valve is embedded in the groove. After forging, the additional connecting short tube is further processed such that at least one side of the groove of the additional connecting short tube is configured to have a predetermined lateral height. In the installed state, to restrict the rotational freedom about the additional mounting axis in a selected rotational direction, contact between the orientation element of the additional injection valve and the additional connecting short tube can be achieved on at least one side.

6. The component according to claim 1, Its features are, The component is a fluid distributor.

7. The component according to claim 2, Its features are, After the forging, the connecting short tube is reprocessed such that the edge height is changed during the reprocessing so that the side or the other side is configured to have a predetermined lateral height.

8. An injection device for a mixed-compression externally ignited internal combustion engine, the injection device being used to inject a fluid, the fluid being a fuel or a mixture having a fuel, the injection device having at least one component according to any one of claims 1 to 7.

9. The spraying device according to claim 8, Its features are, The fluid is gasoline and / or ethanol.

10. A method for manufacturing a component according to any one of claims 1 to 7, wherein, After forging, the connecting short tube is further processed such that at least one side of the groove of the connecting short tube is configured with a predetermined lateral height, so that in the installed state, in order to restrict the degree of rotational freedom about the mounting axis in the selected rotational direction, contact between the orientation element of the injection valve and the connecting short tube can be achieved on at least one side.

Images