Modular and scalable rail fuel system architecture

Abstract

A modular system for injecting fuel into an engine includes a fuel rail connected to the engine. A plurality of connecting members are connected to the fuel rail, and each of the plurality of connecting members is configured to receive fuel from the fuel rail. Fuel is directed to the plurality of fuel injectors, and the plurality of fuel injectors are configured to direct fuel to the plurality of cylinders. The plurality of outer fuel lines are connected to the plurality of connecting members, and the plurality of outer fuel lines are arranged in a single configuration. The single configuration allows the fuel rail to be connected to multiple engine configurations while multiple outer fuel lines are arranged in the single configuration.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a divisional application of a patent with an application date of July 29, 2020, application number 202080054159.5, and name “Modular and Scalable Rail Fuel System Architecture”. Technical Field

[0002] The present invention generally relates to systems for injecting fuel into an internal combustion engine. Background Art

[0003] In an internal combustion engine, fuel is provided to the engine through a fuel injection system. The fuel injection system guides the fuel contained in a fuel pump through an injector line connected to a fuel injector. The fuel injector is directly or indirectly connected to the cylinder in the engine. The fuel is mixed with air (in the cylinder or outside the cylinder) and ignited in the cylinder to provide power for the engine. Internal combustion engines are provided in a variety of different sizes and can vary in the arrangement (e.g., in-line arrangement or V-arrangement) and number of cylinders. Cylinders with different arrangements require different injector line designs to accommodate the corresponding multiple cylinder arrangements. Summary of the invention

[0004] In one set of embodiments, an engine system includes a plurality of fuel injectors configured to direct fuel to a plurality of cylinders. A modular system for injecting fuel into an engine system includes a fuel rail. A plurality of connecting members are connected to the fuel rail, and each of the plurality of connecting members is configured to receive fuel from the fuel rail. The fuel is directed to the plurality of fuel injectors. A plurality of external fuel lines are connected to the plurality of connecting members, and the plurality of external fuel lines are arranged in a single configuration. The single configuration allows the fuel rail to be connected to a variety of engine configurations while maintaining the plurality of external fuel lines arranged in the single configuration.

[0005] In another set of embodiments, an engine system includes a plurality of fuel injectors, a fuel rail, and a plurality of connection members, the plurality of fuel injectors being configured to direct fuel to a plurality of cylinders. Each of the plurality of connection members is configured to receive fuel from the fuel rail and direct the fuel to the plurality of fuel injectors. A plurality of outer fuel lines are connected to the plurality of connection members and arranged in a first configuration, the first configuration allowing the fuel rail to be connected to a variety of engine configurations while maintaining the plurality of outer fuel lines arranged in the first configuration. A plurality of connection blocks are connected to the plurality of outer fuel lines and configured to direct fuel from the plurality of outer fuel lines to a plurality of inner fuel lines.

[0006] In yet another set of embodiments, an engine system includes a plurality of fuel injectors configured to direct fuel to a plurality of cylinders. A modular system for injecting fuel into an engine system includes a first fuel rail and a second fuel rail. A conduit fluidly connected to the first fuel rail and the second fuel rail is configured to provide fuel to the first fuel rail and the second fuel rail in parallel. Each of a plurality of connecting members is configured to receive fuel from the first fuel rail or the second fuel rail and direct the fuel to the plurality of fuel injectors. A plurality of external fuel lines are connected to the plurality of connecting members and arranged in a single configuration. The single configuration allows the first fuel rail and the second fuel rail to be connected to a variety of engine configurations while maintaining the plurality of external fuel lines arranged in the single configuration. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The details of one or more embodiments are set forth in the following drawings and description. Other disclosed features, aspects, and advantages of the present disclosure will become apparent from the description, drawings, and claims, in which:

[0008] Figure 1 is a schematic diagram of a fuel dispensing system according to certain embodiments.

[0009] Figure 2 Connected to the engine Figure 1 Schematic diagram of the fuel distribution system.

[0010] Figure 3 is connected to another engine Figure 1 Schematic diagram of the fuel distribution system.

[0011] Figure 4 is a schematic diagram of a connector block according to a specific embodiment.

[0012] Figure 5 yes Figure 4 Schematic diagram of a cross section of a connection block.

[0013] Figure 6 yes Figure 4 Schematic diagram of another cross section of the connection block.

[0014] Figure 7 is a schematic diagram of an external fuel line connected to an injector fitting according to certain embodiments.

[0015] Figure 8 is connected to the injector located under the engine valve cover (not shown) Figure 1 Schematic diagram of a portion of a fuel distribution system.

[0016] Fig. 9 is a schematic diagram of another fuel dispensing system according to certain embodiments.

[0017] Fig.10 is connected to the engine as Fig. 9 Schematic diagram of the fuel distribution system.

[0018] Fig.11 is connected to another engine Fig. 9 Schematic diagram of the fuel distribution system.

[0019] Fig.12 is a schematic diagram of another connection block according to certain embodiments.

[0020] Fig.13 yes Fig.12 Schematic diagram of a cross section of a connection block.

[0021] Fig.14 yes Fig.12 Schematic diagram of another cross section of the connection block.

[0022] Fig.15 is a schematic diagram of an external fuel line connected to an injector fitting according to certain embodiments.

[0023] Fig.16 is connected to the injector located under the engine valve cover (not shown) Fig. 9 Schematic diagram of a portion of a fuel distribution system. DETAILED DESCRIPTION

[0024] The following is a more detailed description of various concepts and embodiments related to methods, apparatus, and systems for directing fuel to a fuel injector in an internal combustion engine system. The concepts introduced above and discussed in more detail below can be implemented in any of a variety of ways, as the concepts described are not limited to any particular embodiment. Examples of specific embodiments and applications are provided primarily for clarity of the invention.

[0025] In an internal combustion engine, fuel is provided to the engine through a fuel injection system. The fuel (either in the cylinder or outside the cylinder) is mixed with air and ignited in the cylinder to power the engine. Internal combustion engines come in different sizes and can vary in the arrangement of cylinders (e.g., in-line or v-arrangement) and the number of cylinders arranged. Different arrangements of cylinders require different injector line designs to accommodate the corresponding multiple cylinder arrangements.

[0026] Embodiments of the present invention relate to a system for providing fuel to an engine, the system including a modular fuel rail connected to an intake manifold or other suitable location. An outer fuel line can connect the fuel rail to a connection block connected to a rocker housing. In various embodiments, the outer fuel line can include a double wall or single wall design. The connection block provides a path for fuel from the outer fuel line to an inner fuel line under the valve cover. The inner fuel line is composed of multiple walls to provide leaking fuel back to the connection block and away from the valve cover.

[0027] Various embodiments of the system described herein provide benefits applicable to internal combustion engines in both in-line and v-arrangements. The modular system allows the fuel rail to be integrated into existing engines. When the multi-wall design is connected to the hot side of the engine, the risk of fuel atomization from the injector connection can be reduced. Leaking fuel at the cold side connection keeps the fuel away from hot components and reduces the risk of leaking fuel contacting hot areas. The leaked fuel can be discharged or collected in a controlled manner. Various embodiments of the system can reduce total acquisition cost and engine maintenance time.

[0028] Figure 1 is a schematic diagram of a fuel dispensing system 100 in accordance with certain embodiments. Figure 1 The fuel distribution system 100 includes a fuel rail 102, a first connection member 110, a second connection member 112, a third connection member 114, a fourth connection member 116, a fifth connection member 118, and a sixth connection member 120 (collectively referred to herein as "connection members 110-120"). The fuel distribution system 100 also includes a first external fuel line 130, a second external fuel line 132, a third external fuel line 134, a fourth external fuel line 136, a fifth external fuel line 138, and a sixth external fuel line 140 (collectively referred to herein as "external fuel lines 130-140").

[0029] The fuel rail 102 is configured to direct fuel from a fuel pump and through the connecting members 110-120, thereby allowing the fuel to flow through the external fuel lines 130-140. The fuel rail 102 can be made of any material suitable for directing fuel in an automotive environment. Suitable materials include, but are not limited to, steel, aluminum, plastic, composite materials, or any other material suitable for the purpose of directing fuel in an automotive environment. The connecting members 110-120 are outlets in the fuel rail 102 and are configured to provide a secure connection with the external fuel lines 130-140 to prevent fuel from leaking when being directed to the engine. The secure connection can be provided by any suitable connection mechanism, including but not limited to threaded connections, bayonet connections, quick-change joints, and any other type of connection that can transfer fuel from the fuel rail 102 to the external fuel lines 130-140 and substantially prevent leakage.

[0030] The external fuel lines 130-140 can be arranged on the fuel rail 102 in a single configuration to achieve modularity of the fuel distribution system 100. As described herein, "single configuration" refers to the arrangement of the external fuel lines 130-140 between the fuel rail 102 and the engine. Figure 1 In the single configuration shown, the first external fuel line 130 is connected to the first connection block 150, the second external fuel line 132 is connected to the fourth connection block 156, the third external fuel line 134 is connected to the second connection block 152, the fourth external fuel line 136 is connected to the fifth connection block 158, the fifth external fuel line 138 is connected to the third connection block 154, and the sixth external fuel line 140 is connected to the sixth connection block 160. The first connection block 150, the second connection block 152, the third connection block 154, the fourth connection block 156, the fifth connection block 158, and the sixth connection block 160 are collectively referred to herein as "connection blocks 150-160". Each of the connection blocks 150-160 includes connections similar to the connection members 110-120 to secure the external fuel lines 130-140. The connection blocks 150-160 are operable to direct fuel from the external fuel lines 130-140 to the additional fuel lines. Thus, the connection blocks 150-160 are made of any material suitable for connecting to the fuel injection lines and directing pressurized fuel to the fuel injectors. Suitable materials include, but are not limited to, steel, aluminum, or any other type of metal or composite material that can direct pressurized fuel. Additionally, the external fuel lines 130-140 are made of any material suitable for connecting to the fuel rail 102 and directing pressurized fuel to the connection blocks 150-160. Suitable materials include, but are not limited to, steel, aluminum, or any other type of metal, high-strength plastic, or composite material that can direct pressurized fuel. Arranged as described, the fuel rail 102 provides modularity that can be used across different engine sizes and cylinder configurations, and has the ability to provide fuel to up to six fuel injectors. This modularity will be referenced Figures 2 to 3 Further description.

[0031] The fuel distribution system 100 also includes a first inner fuel line 170, a second inner fuel line 172, a third inner fuel line 174, a fourth inner fuel line 176, a fifth inner fuel line 178, and a sixth inner fuel line 180 (collectively referred to herein as "inner fuel lines 170-180"). The inner fuel lines 170-180 are connected to the connection blocks 150-160, and the inner fuel lines 170-180 are configured to guide the pressurized fuel from the connection blocks 150-160 to the fuel injectors (not shown). The inner fuel lines 170-180 are made of any material suitable for connecting to the connection blocks 150-160 and guiding the pressurized fuel to the fuel injectors. Suitable materials include, but are not limited to, steel, aluminum, or any other type of metal, high-strength plastic, or composite material that can guide pressurized fuel.

[0032] Figure 2 yes Figure 1 Schematic diagram of a fuel distribution system 100 connected to an engine 200. In some embodiments, the engine 200 includes twelve cylinders; however, for the purpose of explanation, only six cylinders are shown here. One of ordinary skill in the art will understand that the description of the six cylinders shown also applies to the cylinders not shown. The engine 200 includes a first housing 202, a second housing 204, a third housing 206, a fourth housing 208, a fifth housing 210, and a sixth housing 212 (collectively referred to herein as "housings 202-212"). The housings 202-212 include fuel injection components (e.g., connection blocks 150-160 and internal fuel lines 170-180) required to guide fuel from external fuel lines 130-140 to the cylinders for combustion. The fuel rail 102 is rigidly connected to the engine 200 so that the fuel rail 102 does not move relative to the engine 200. The fuel rail 102 can also be removably connected to the engine 200 for maintenance purposes. The first inner fuel line 170 is connected to the first housing 202, the third outer fuel line 134 is connected to the second housing 204, the fifth outer fuel line 138 is connected to the third housing 206, the second outer fuel line 132 is connected to the fourth housing 208, the fourth outer fuel line 136 is connected to the fifth housing 210, and the sixth outer fuel line 140 is connected to the sixth housing 212. Thus, the outer fuel lines 130-140 are connected to the Figure 1 The same arrangement as shown is provided and fuel is supplied to the engine 200. Figure 2 The cylinder shown in FIG. 1 is provided with fuel.

[0033] Figure 3 is connected to the engine 300 Figure 1Schematic diagram of multiple fuel distribution systems 100. In some embodiments, engine 300 includes 16 cylinders; however, for the purpose of explanation, only eight cylinders are shown here. One of ordinary skill in the art will understand that the description of the eight cylinders shown also applies to the eight cylinders not shown. Engine 300 includes a first housing 302, a second housing 304, a third housing 306, a fourth housing 308, a fifth housing 310, a sixth housing 312, a seventh housing 314, and an eighth housing 316 (collectively referred to herein as "housings 302-316"). Housings 302-316 include fuel injection components required to direct fuel from a fuel line to the cylinders for combustion.

[0034] The engine 300 is also shown to include a first fuel rail 320 and a second fuel rail 340. The first fuel rail 320 and the second fuel rail 340 are substantially similar to Figure 1 However, for the purpose of explanation and clarity, the first fuel rail 320 and the second fuel rail 340 are Figure 3 Different reference numbers are provided in FIG. 1 . The first fuel rail 320 and the second fuel rail 340 include connection members that are substantially similar to the connection members 110 - 120 of the fuel rail 102 .

[0035] The first fuel rail 320 includes a first connection 330 and a sixth connection 332 that are not connected to the inner fuel lines because the first fuel rail 320 only provides fuel to four cylinders. Therefore, the first connection 330 and the sixth connection 332 are blocked to prevent fuel from leaking at the first connection 330 and the sixth connection 332. The first connection 330 and the sixth connection 332 can be blocked by any type of mechanism suitable for preventing fuel leakage (e.g., a removable cover, a non-removable cover, or any other type of blocking mechanism). The first fuel rail 320 also includes a second outer fuel line 322 connected to the third housing 306, a third outer fuel line 324 connected to the first housing 302, a fourth outer fuel line 326 connected to the fourth housing 308, and a fifth outer fuel line 328 connected to the second housing 304. Second outer fuel line 322 is substantially similar to second outer fuel line 132, third outer fuel line 324 is substantially similar to third outer fuel line 134, fourth outer fuel line 326 is substantially similar to fourth outer fuel line 136, and fifth outer fuel line 328 is substantially similar to fifth outer fuel line 138. Arranged as described, first fuel rail 320 provides fuel to first housing 302, second housing 304, third housing 306, and fourth housing 308.

[0036] The second fuel rail 340 includes a first connection 350 and a sixth connection 352 that are not connected to the inner fuel lines because the second fuel rail 340 only provides fuel to four cylinders. Therefore, the first connection 350 and the sixth connection 352 are blocked to prevent fuel from leaking at the first connection 350 and the sixth connection 352. The first connection 350 and the sixth connection 352 can be blocked by any type of mechanism suitable for preventing fuel leakage (e.g., a removable cover, a non-removable cover, or any other type of blocking mechanism). The second fuel rail 340 also includes a second outer fuel line 342 connected to the seventh housing 314, a third outer fuel line 344 connected to the fifth housing 310, a fourth outer fuel line 346 connected to the eighth housing 316, and a fifth outer fuel line 348 connected to the sixth housing 312. Second outer fuel line 342 is substantially similar to second outer fuel line 132, third outer fuel line 344 is substantially similar to third outer fuel line 134, fourth outer fuel line 346 is substantially similar to fourth outer fuel line 136, and fifth outer fuel line 348 is substantially similar to fifth outer fuel line 138. Arranged as described, second fuel rail 340 provides fuel to fifth housing 310, sixth housing 312, seventh housing 314, and eighth housing 316.

[0037] The first fuel rail 320 and the second fuel rail 340 are fluidly connected by a conduit 370. The conduit 370 may be any type of system or device by which fuel is directed between the first fuel rail 320 and the second fuel rail 340 so that the fuel may be provided to the housings 302-316. The conduit 370 may be constructed of materials similar to the outer fuel lines 130-140 or the inner fuel lines 170-180.

[0038] Not present Figure 3 The cylinders shown in FIG. 1 are provided with fuel via two additional fuel rails that are substantially similar to the first fuel rail 320 and the second fuel rail 340 and have the same configuration as described.

[0039] Arranged as described, multiple fuel rails substantially similar to fuel rail 102 can be connected to provide fuel to multiple housings, and the arrangement of external fuel lines 130-140 can be maintained to make fuel rail 102 modular and so that it can be used across a variety of engine sizes and configurations. For example, by including three caps on connection members 110-120, only six external fuel lines provide fuel to the engine, so that two fuel rails 102 can be used in a six-cylinder engine.

[0040] Figure 41 is a schematic diagram of a first connection block 150 according to a particular embodiment. Because the connection blocks 150-160 are substantially similar, the description of the first connection block 150 applies to all connection blocks 150-160. The first connection block 150 includes a connection block inlet 402, a connection block outlet 404, a first passage 406, and a second passage 408. The connection block inlet 402 is an opening that is connected to an external fuel line (e.g., the first external fuel line 130). The connection block outlet 404 is an opening that is connected to an internal fuel line (e.g., the first internal fuel line 170). The connection block inlet 402 and the connection block outlet 404 are fluidly connected via a fuel path, which will be referred to as Figure 5 Further described. The first channel 406 and the second channel 408 are grooves located in the first connection block 150 and are sized and configured to secure sealing components such as o-rings. The sealing components are configured to create a seal between the first connection block 150 and a housing (e.g., the first housing 202) (when the first connection block 150 is connected to the first housing 202).

[0041] Figure 5 is with Figure 2 The first housing 202 is assembled Figure 4 Schematic diagram of a cross section of the first connection block 150 taken along section AA. Section AA is taken through the center of the first connection block 150. The first outer fuel line 130 also includes an outer fuel line path 508, through which the fuel flows to the first connection block 150. The first inner fuel line 170 also includes an inner fuel line path 510 and a cavity 512, through which the fuel flows to the fuel injector. The cavity 512 is a space surrounding the connection between the first inner fuel line 170 and the connection block outlet 404, wherein fuel leaking from the fuel injector accumulates in the space so that it can be directed away from the first connection block 150. The cavity 512 is in fluid communication with a leakage path (not shown), which will be referred to in detail. Figure 6 Further description.

[0042] The first connection block 150 includes an outer fuel line hole 502, an inner fuel line hole 504, a fuel accumulator 506, and a plug 520. The outer fuel line hole 502 is an opening in the connection block inlet 402 through which fuel can flow from the outer fuel line path 508 to the fuel accumulator 506. The inner fuel line hole 504 is an opening in the connection block outlet 404 through which fuel can flow from the fuel accumulator 506 to the inner fuel line path 510. The fuel accumulator 506 is a cavity within the first connection block 150 through which fuel flows between the outer fuel line hole 502 and the inner fuel line hole 504. The fuel accumulator 506 is operable to hold a sufficient volume of fuel to reduce fuel pressure losses along the fuel circuit from the fuel rail 102 to the fuel injector. For example, in the case of pressure loss at the fuel injector, the available fuel volume in the fuel accumulator 506 is sufficient to reduce the pressure loss by providing additional fuel to the flow. The size and / or configuration of the fuel accumulator 506 can be modified based on the desired fuel volume and / or fuel flow rate from the first outer fuel line 130 to the first inner fuel line 170. The desired fuel volume and / or fuel flow rate in the fuel accumulator 506 can be based on the desired performance of the engine in which the connecting block 150 is installed. For example, in an engine that expects high performance, a large fuel accumulator 506 (e.g., a diameter between about 10 mm and about 30 mm) may be required. In an engine that is sufficient for minimum performance, a large fuel accumulator 506 (e.g., a diameter between about three mm and about six mm in a specific embodiment) may not be required. In an embodiment where standard engine performance is expected, the diameter of the fuel accumulator 506 can be, for example, between about 6 mm and about 10 mm. The shape of the connection block 150 makes the connection block 150 compatible with various types of engines, and the diameter of the fuel accumulator 506 can be modified based on the type of engine to which the connection block 150 is installed. Therefore, the connection block 150 provides greater efficiency for manufacturers because a single design of the connection block 150 can be used for multiple engines.

[0043] The plug 520 is configured to be combined with the connection block 150 to prevent fuel from leaking out of the fuel accumulator 506. The plug 520 can be made of any material (e.g., rubber, plastic, etc.) suitable for forming a seal with the connection block 150. In some embodiments, the plug 520 is an integral component. The plug 520 can also include multiple components that are configured to form a seal with the connection block 150. In a non-limiting example, the plug 520 can include a base component around which one or more sealing components (e.g., o-rings, etc.) are arranged so that the sealing component engages with the connection block 150 to create a seal therebetween.

[0044] Figure 6 is with Figure 2 The first housing 202 is connected Figure 4 FIG. 6 is a schematic diagram of a cross section of the first connection block 150 taken along section BB. Section BB is offset from the center of the first connection block 150 and is not coplanar with section AA. The first connection block 150 includes a leakage path 602 that is fluidly connected to the cavity 512. Fuel accumulated in the cavity 512 from the first inner fuel line 170 is directed into the leakage path 602, which causes the fuel to be directed away from the first connection block 150. In some embodiments, the leakage path 602 directs the fuel to the outside of the engine so that there is a visible indicator of a fuel leak to indicate that maintenance is needed.

[0045] Figure 7 is a schematic diagram of the first inner fuel line 170 connected to an injector fitting 704 according to a particular embodiment. The injector fitting 704 is where the first inner fuel line 170 connects to the fuel injector. When connected together, fuel flows from the first inner fuel line 170 to the fuel injector, which allows the fuel to be injected into the cylinder to provide combustion. In some embodiments, some of the fuel from the first inner fuel line 170 does not reach the fuel injector and therefore leaks from the first inner fuel line 170. A sealing member (e.g., an o-ring) prevents the leaked fuel from leaking into additional engine components, causing the leaked fuel to accumulate in the groove 702. The groove 702 is a space separated from the inner fuel line path 510 and provides a path for the leaked fuel to flow away from the additional engine components. Therefore, the groove 702 is used to create a fuel line with multiple walls to provide multiple fuel flows. The leaked fuel follows the Figure 7 The path indicated by the arrows shown in the figure allows the leaked fuel to fill the cavity 512 and flow through the reference Figures 5 and 6 The leakage path 602 is described. In some embodiments, the outer fuel lines 130-140 and the inner fuel lines 170-180 can include multiple walls to address fuel leakage. For example, in embodiments that must meet more stringent safety requirements (e.g., in marine engines), the outer fuel lines 130-140 and the inner fuel lines 170-180 can include multiple walls so that leaking fuel can be directed away from sensitive engine components. In some arrangements, only one of the outer fuel lines 130-140 and the inner fuel lines 170-180 can include multiple walls to address fuel leakage.

[0046] Figure 8 is connected to the injector located under the engine valve cover (not shown) Figure 1Schematic diagram of a portion of a fuel distribution system 100 of FIG. A fuel rail 102 (not shown) provides fuel to a first outer fuel line 130. The fuel flows through the first outer fuel line 130 and enters a first connection block 150. The fuel flows through the first connection block 150 and enters a first inner fuel line 170, which causes the fuel to reach a fuel injector to be injected into a cylinder for combustion. Fuel that does not reach the fuel injector (e.g., leaked fuel) flows back to the first connection block 150 through the first inner fuel line 170, so that the leaked fuel can be directed away from the first housing 202 via a leak path 602 (not shown). The leaked fuel can then be collected for further use or discharge. Arranged as described, the fuel distribution system 100 helps to direct fuel leaking at the fuel injector away from hot components of the engine, thereby avoiding the risk of fuel dripping or spraying on hot areas.

[0047] Fig. 9 is a schematic diagram of a fuel dispensing system 900 according to another specific embodiment. Fig. 9 The fuel distribution system 900 includes a fuel rail 902, a first connecting member 910, a second connecting member 912, a third connecting member 914, a fourth connecting member 916, a fifth connecting member 918, and a sixth connecting member 920 (collectively referred to herein as "connecting members 910-920"). The fuel distribution system 900 also includes a first external fuel line 930, a second external fuel line 932, a third external fuel line 934, a fourth external fuel line 936, a fifth external fuel line 938, and a sixth external fuel line 940 (collectively referred to herein as "external fuel lines 930-940").

[0048] Fuel rail 902 is substantially similar to Figure 1 Fuel rail 102, connecting members 910-920 are substantially similar to Figure 1 The connecting members 110-120, the external fuel lines 930-940 are substantially similar to Figure 1 The outer fuel lines 130-140 make about Figure 1 The description of these components applies to Fig. 9 corresponding components.

[0049] The single configuration of the external fuel lines 930-940 is different from Figure 1 A single configuration of the external fuel lines 130-140. For example, in Fig. 9In the single configuration shown, the first external fuel line 930 is connected to the first connection block 950, the second external fuel line 932 is connected to the second connection block 152, the third external fuel line 934 is connected to the fourth connection block 956, the fourth external fuel line 936 is connected to the third connection block 954, the fifth external fuel line 938 is connected to the fifth connection block 958, and the sixth external fuel line 940 is connected to the sixth connection block 960. The first connection block 950, the second connection block 952, the third connection block 954, the fourth connection block 956, the fifth connection block 958, and the sixth connection block 160 are collectively referred to herein as "connection blocks 950-960".

[0050] The fuel distribution system 900 also includes a first inner fuel line 970, a second inner fuel line 972, a third inner fuel line 974, a fourth inner fuel line 976, a fifth inner fuel line 978, and a sixth inner fuel line 980 (collectively referred to herein as "inner fuel lines 970-980"). The inner fuel lines 970-980 are connected to the connection blocks 950-960 and are configured to guide the pressurized fuel from the connection blocks 950-960 to the fuel injectors (not shown).

[0051] Fig.10 is connected to the engine 1000 Fig. 9 Schematic diagram of fuel distribution system 900. In some embodiments, engine 1000 includes twelve cylinders; however, for the purpose of explanation, only six cylinders are shown here. A person of ordinary skill in the art will understand that Fig.10 The description of the six cylinders shown also applies to the cylinders not shown. The engine 1000 includes a first housing 1002, a second housing 1004, a third housing 1006, a fourth housing 1008, a fifth housing 1010, and a sixth housing 1012 (collectively referred to herein as "housings 1002-1012"). The housings 1002-1012 include the fuel injection components (e.g., connection blocks 950-960 and internal fuel lines 970-980) required to direct fuel from the external fuel lines 930-940 to the cylinders for combustion. The fuel rail 902 is rigidly connected to the engine 1000 so that the fuel rail 902 does not move relative to the engine 1000. The fuel rail 902 can also be removably connected to the engine 1000 for maintenance purposes. The first external fuel line 930 is connected to the first housing 1002, the second external fuel line 932 is connected to the second housing 1004, the fourth external fuel line 936 is connected to the third housing 1006, the third external fuel line 934 is connected to the fourth housing 1008, the fifth external fuel line 936 is connected to the fifth housing 1010, and the sixth external fuel line 940 is connected to the sixth housing 1012. Thus, the external fuel lines 930-940 are connected to the third housing 1006. Figure 1The same arrangement as shown is provided and fuel is supplied to the engine 1000. Fig.10 The cylinder shown in FIG. 1 is provided with fuel.

[0052] Fig.11 Is multiple Fig. 9 Schematic diagram of fuel distribution system 900 connected to engine 1100. In some embodiments, engine 1100 includes 16 cylinders; however, for the purpose of explanation, only eight cylinders are shown here. One of ordinary skill in the art will understand that the description of the eight cylinders shown also applies to the eight cylinders not shown. Engine 1100 includes a first housing 1102, a second housing 1104, a third housing 1106, a fourth housing 1108, a fifth housing 1110, a sixth housing 1112, a seventh housing 1114, and an eighth housing 1116 (collectively referred to herein as "housings 1102-1116"). Housings 1102-1116 include fuel injection components required to direct fuel from a fuel line to the cylinders for combustion.

[0053] The engine 1100 is also shown to include a first fuel rail 1120 and a second fuel rail 1140. The first fuel rail 1120 and the second fuel rail 1140 are substantially similar to Figure 1 However, for the purpose of explanation and clarity, the first fuel rail 1120 and the second fuel rail 1140 are Fig.11 Different reference numbers are provided in FIG. The first fuel rail 1120 and the second fuel rail 1140 include connecting members that are substantially similar to the connecting members 910-920 of the fuel rail 902. In some embodiments, the first fuel rail 1120 and the second fuel rail 1140 include more or fewer connecting members than the fuel rail 902. The number of connecting members present on the first fuel rail 1120 and the second fuel rail 1140 depends on the number of cylinders to which the first fuel rail 1120 and the second fuel rail 1140 supply fuel. Fig.11 In the illustrated embodiment, first fuel rail 1120 and second fuel rail 1140 each include five connecting members.

[0054] The first fuel rail 1120 includes a first outer fuel line 1122 connected to the first housing 1102, a second outer fuel line 1124 connected to the second housing 1104, a third outer fuel line 1126 connected to the third housing 1106, and a fourth outer fuel line 1128 connected to the fourth housing 1108. The first outer fuel line 1122 is substantially similar to the first outer fuel line 930, the second outer fuel line 1124 is substantially similar to the second outer fuel line 932, the third outer fuel line 1126 is substantially similar to the third outer fuel line 934, and the fourth outer fuel line 1128 is substantially similar to the fourth outer fuel line 936. Arranged as described, the first fuel rail 1120 provides fuel to the first housing 1102, the second housing 1104, the third housing 1106, and the fourth housing 1108.

[0055] Second fuel rail 1140 includes a first outer fuel line 1142 connected to fifth housing 1110, a second outer fuel line 1144 connected to sixth housing 1112, a third outer fuel line 1146 connected to seventh housing 1114, and a fourth outer fuel line 1148 connected to eighth housing 1116. First outer fuel line 1142 is substantially similar to first outer fuel line 930, second outer fuel line 1144 is substantially similar to second outer fuel line 932, third outer fuel line 1146 is substantially similar to third outer fuel line 934, and fourth outer fuel line 1148 is substantially similar to fourth outer fuel line 936. Arranged as described, first fuel rail 1120 provides fuel to fifth housing 1110, sixth housing 1112, seventh housing 1114, and eighth housing 1116.

[0056] The first fuel rail 1120 and the second fuel rail 1140 are fluidly connected by a conduit 1160. The conduit 1160 may be any type of system or device by which fuel may be directed substantially simultaneously to the first fuel rail 1120 and the second fuel rail 1140 so that the fuel may be provided to the housings 1102-1116. The conduit 1160 is fluidly connected to the first fuel rail 1120 via a first conduit fuel line 1162 and is fluidly connected to the second fuel rail 1140 via a second conduit fuel line 1164. The conduit 1160 may be constructed of a material similar to the outer fuel lines 930-940 or the inner fuel lines 970-980. In operation, the fuel flows through the conduit 1160 to reach the first fuel rail 1120 and the second fuel rail 1160. Thus, the first fuel rail 1120 and the second fuel rail 1140 are arranged in parallel.

[0057] Not present Fig.11The cylinders shown in FIG. 1 are provided with fuel via two additional fuel rails that are substantially similar to the first fuel rail 1120 and the second fuel rail 1140 and have the same configuration as described.

[0058] Arranged as described, multiple fuel rails substantially similar to fuel rail 902 can be connected to provide fuel to multiple housings, and the arrangement of external fuel lines 930-940 can be maintained to make fuel rail 902 modular and so that it can be used across a variety of engine sizes and configurations. For example, by including covers on connection members 910-920, only six external fuel lines provide fuel to the engine, so that two fuel rails 902 can be used in a six-cylinder engine.

[0059] Fig.12 is a schematic diagram of a first connection block 950 according to a particular embodiment. Because the connection blocks 950-960 are substantially similar, the description of the first connection block 950 applies to all connection blocks 950-960. The first connection block 950 includes a connection block inlet 1202, a connection block outlet 1204, a first passage 1208, and a second passage 1212. The connection block inlet 1202 is an opening that is connected to an external fuel line (e.g., the first external fuel line 930). The connection block outlet 1204 is an opening that is connected to an internal fuel line (e.g., the first internal fuel line 970). The connection block inlet 1202 and the connection block outlet 1204 are fluidly connected via a fuel path, which will be referred to as Fig.13 Further description. The first channel 1208 and the second channel 1212 are grooves located in the first connection block 950, and the size and configuration are defined as fixed sealing components. For example, the size of the first sealing component 1210 is designed to fit within the first channel 1208, and the size of the second sealing component 1214 is designed to fit within the second channel 1212. The first sealing component 1210 and the second sealing component 1212 are configured to create a seal between the first connection block 950 and the housing (e.g., the first housing 1002) (when the first connection block 950 is connected to the first housing 1002).

[0060] The first connection block 950 defines a hole 1216 that is sized and configured to receive a first plug 1218. Fig.13 The first plug 1218 is further described. The first connection block 950 also defines an opening 1220 that is sized and configured to receive a second plug 1222. Fig.14 The second stopper 1222 is further described.

[0061] Fig.13 is with Fig.10 The first housing 1002 is assembled Fig.12146 .

[0062] The first connection block 950 includes an outer fuel line hole 1302, an inner fuel line hole 1304, a fuel accumulator 1306, and a first plug 1218. The outer fuel line hole 1302 is substantially similar to Figure 5 The outer fuel line hole 502, and the inner fuel line hole 1304 are substantially similar to Figure 5 1302 and the inner fuel line hole 504. Thus, the description of the outer fuel line hole 502 and the inner fuel line hole 504 applies to the outer fuel line hole 1302 and the inner fuel line hole 1304, respectively. The fuel accumulator 1306 is substantially similar to the fuel accumulator 506; therefore, the description of the fuel accumulator 506 applies to the fuel accumulator 1306. The first plug 1218 is substantially similar to the plug 520, with the only difference being the position of the plug relative to the first connecting block 950 (e.g., the plug 520 is located on the end of the first connecting block 150 closest to the connecting block outlet 404, and the first plug 1218 is located on the end of the first connecting block 950 closest to the connecting block inlet 1202). Other than this difference, the description of the plug 520 applies to the first plug 1218.

[0063] Fig.14 is with Fig.10 The first housing is connected Fig.12FIG. 1 is a schematic diagram of a cross section of the first connection block 950 taken along section BB. Section BB is offset from the center of the first connection block 950 and is not coplanar with section AA. The first connection block 950 includes a first leakage path 1402 that is fluidly connected to the cavity 1312. Fuel accumulated in the cavity 1312 from the first internal fuel line 970 is directed into the first leakage path 1402 so that the fuel is directed away from the first connection block 950. The first leakage path 1402 is fluidly connected to a second leakage path 1404, which directs the fuel from the first leakage path 1402 to a third leakage path 1406. The third leakage path 1406 directs the fuel out of the first connection block 950. In some embodiments, the third leakage path 1406 directs the fuel to the outside of the engine so that there is a visible indicator of a fuel leak to indicate that maintenance is needed. The second plug 1222 is configured to be connected to the opening 1220 to prevent the fuel from leaking out of the second leakage path 1404. The second stopper 1222 can be made of any material (e.g., rubber, plastic, etc.) suitable for forming a seal between the second stopper 1222 and the first connection block 950. In some embodiments, the second stopper 1222 is a single component. The second stopper 1222 can also include multiple components that are configured to create a seal between the second stopper 1222 and the first connection block 950. In a non-limiting example, the second stopper 1222 can include a base component around which one or more sealing components (e.g., o-rings, etc.) are disposed so that the sealing components engage with the first connection block 950 to create a seal.

[0064] Fig.15 is a schematic diagram of the first inner fuel line 970 connected to the injector fitting 1504 in accordance with a particular embodiment. The injector fitting 1504 is where the first inner fuel line 970 connects to the fuel injector. When connected together, fuel flows from the first inner fuel line 970 to the fuel injector, which allows the fuel to be injected into the cylinder to provide combustion. In some embodiments, some of the fuel from the first inner fuel line 970 does not reach the fuel injector and therefore leaks from the first inner fuel line 970. A sealing member (e.g., an o-ring) prevents the leaked fuel from leaking into additional engine components and causes the leaked fuel to accumulate in the groove 1502. The groove 1502 is a space separated from the internal fuel line path 1310 and provides a path for the leaked fuel to flow away from the additional engine components. Thus, the groove 1502 is used to create a fuel line with multiple walls to provide multiple fuel flows. The leaked fuel follows a substantially similar Figure 7 The path indicated by the arrows shown in the figure allows the leaked fuel to fill the cavity 1312 and flow through the Fig.14The first leakage path 1402. In some embodiments, the outer fuel lines 930-940 and the inner fuel lines 970-980 may include multiple walls to address fuel leakage. For example, in embodiments where more stringent safety requirements must be met (e.g., in a marine engine), the outer fuel lines 930-940 and the inner fuel lines 970-980 may include multiple walls so that leaking fuel can be directed away from sensitive engine components. In some arrangements, only one of the outer fuel lines 930-940 and the inner fuel lines 970-980 may include multiple walls to address fuel leakage.

[0065] Fig.16 is connected to the injector located under the engine valve cover (not shown) Fig. 9 Schematic diagram of a portion of a fuel distribution system 900 of FIG. A fuel rail 902 (not shown) provides fuel to a first outer fuel line 930. The fuel flows through the first outer fuel line 930 and enters a first connection block 950. The fuel flows through the first connection block 950 and enters a first inner fuel line 970, which causes the fuel to reach a fuel injector to be injected into a cylinder for combustion. Fuel that does not reach the fuel injector (e.g., leaked fuel) flows back to the first connection block 950 through the first inner fuel line 970, causing the leaked fuel to be directed away from the first housing 1002 via a first leak path 1402 (not shown). The leaked fuel can then be collected for further use or discharge. Arranged as described, the fuel distribution system 900 helps to direct fuel leaking at the fuel injector away from hot parts of the engine, thereby avoiding the risk of fuel dripping or spraying on hot areas.

[0066] Although the specification contains many specific implementation details, these should not be interpreted as limitations on the scope of the claims, but rather as descriptions of the technical features of specific implementations. Certain features described in this specification in the context of separate implementations may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented in multiple implementations, either individually or in any suitable subcombination. In addition, although the above-mentioned features may be described as working in certain combinations and even initially declared as such, in some cases one or more features from the claimed combination may be cut out of the combination, and the claimed combination may be directed to subcombinations or variations of the subcombinations.

[0067] As used herein, the term "substantially" and similar terms are intended to have a broad meaning consistent with the ordinary and recognized usage of those of ordinary skill in the art to which the subject matter of the present disclosure belongs. Those skilled in the art who read this disclosure should understand that these terms are intended to allow certain features to be described and claimed without limiting the scope of these features to the precise numerical ranges provided. Therefore, these terms should be interpreted as indicating that insubstantial or inconsequential modifications or alterations to the subject matter described and claimed are considered to be within the scope of the present invention as described in the appended claims.

[0068] As used herein, the terms "coupled," "connected," and the like refer to the joining of two components directly or indirectly to one another. Such connection may be stationary (e.g., permanent) or movable (e.g., removable or releasable). Such connection may be achieved by the two components, or the two components and any additional intermediate components, being integrally formed as a single unitary body with one another, or by the two components, or the two components and any additional intermediate components, being connected to one another.

[0069] It is important to note that the construction and arrangement of the systems shown in the various exemplary implementations are illustrative only and not restrictive. All changes and modifications that fall within the spirit and / or scope of the described embodiments are intended to be protected. It should be understood that some features may not be required, and implementations lacking various features may be considered to be within the scope of the present application, which is defined by the subsequent claims. When "portion" language is used, an item may include a portion and / or the entire item, unless specifically stated to the contrary.

[0070] In addition, the term "or" is used in its inclusive sense (rather than in its exclusive sense), so that when used, for example, to connect a list of elements, the term "or" means one, some, or all of the elements in the list. Unless otherwise specifically stated, conjunctions such as phrases "at least one of X, Y, and Z" are otherwise understood in contexts generally used to convey items, terms, etc. It can be X, Y, Z, X and Y, X and Z, Y and Z, or X, Y and Z (i.e., any combination of X, Y, and Z). Therefore, unless otherwise indicated, such conjunction language is generally not intended to imply that certain embodiments require at least one of X, at least one of Y, and at least one of Z to exist separately.

[0071] Although only some embodiments are described in detail in the present disclosure, those skilled in the art who read the present disclosure will readily recognize that many modifications are possible without substantially departing from the novel teachings and advantages of the subject matter described herein (e.g., changes in size, dimensions, structure, shape, and proportions of the various elements, parameter values, mounting arrangements, use of materials, colors, orientations, etc.). For example, an element shown as being integrally formed may be composed of multiple parts or elements, the position of an element may be reversed or otherwise changed, and the nature or number of discrete elements or positions may be changed or varied. The order or sequence of any method process may be changed or reordered according to alternative embodiments. Other substitutions, modifications, changes, and omissions may also be made in the design, operating conditions, and arrangements of the various exemplary embodiments without departing from the scope of the present invention.

Claims

1. A connection block configured to deliver fuel directly from an outer fuel line to an inner fuel line, characterized in that The connection block comprises: a single fuel inlet configured to connect to the external fuel line; an outlet configured to be connected to the inner fuel line; and a fuel accumulator fluidly connected to the single fuel inlet and the outlet, the fuel accumulator being configured to direct fuel from the fuel inlet to the outlet.

2. The connection block according to claim 1, characterized in that: The diameter of the fuel accumulator is determined based on the performance of the engine system associated with the connection block.

3. The connection block according to claim 2, characterized in that: The diameter of the fuel accumulator is between 10 mm and 30 mm.

4. The connection block according to claim 2, characterized in that: The fuel accumulator has a diameter between 3 mm and 6 mm.

5. The connection block according to claim 2, characterized in that: The fuel accumulator has a diameter between 6 mm and 10 mm.

6. The connection block according to claim 1, characterized in that: The connecting block is made of steel.

7. The connection block according to claim 1, characterized in that: The connecting block is made of aluminum.

8. The connection block according to claim 1, characterized in that: The connection block includes a connection member configured to connect the external fuel line to the single fuel inlet.

9. The connection block according to claim 8, characterized in that The connection member is at least one of a threaded connection, a bayonet connection or a quick release joint.

10. The connection block according to claim 1, characterized in that: The connection block also includes at least one groove configured to receive and secure a sealing assembly.

11. The connection block according to claim 10, characterized in that The at least one groove is located between the single fuel inlet and outlet.

12. The connection block according to claim 10, characterized in that The sealing assembly includes an O-ring.

13. The connection block according to claim 1, characterized in that The single fuel inlet defines an external fuel line opening through which fuel may flow from the external fuel line to the fuel accumulator.

14. The connection block according to claim 1, characterized in that The outlet defines an inner fuel line opening through which fuel may flow from the fuel accumulator to the inner fuel line.

15. A connection block configured to deliver fuel from an outer fuel line directly to an inner fuel line, characterized in that: The connection block comprises: an inlet configured to be connected to an external fuel line; an outlet configured to be connected to an internal fuel line; a fuel accumulator fluidly connected to the inlet and the outlet, the fuel accumulator being configured to direct fuel from the inlet to the outlet; and A cavity defined by the outlet and a leak path fluidly coupled to the cavity, the cavity being configured to receive leaking fuel from the inner fuel line and direct the leaking fuel to the leak path.

16. The connection block according to claim 15, characterized in that The leakage path extends in a direction generally parallel to at least one of the inlet or the outlet.

17. The connection block system according to claim 15, characterized in that: The leakage path extends in a direction substantially perpendicular to at least one of the inlet or the outlet.

18. A connection block for conveying fuel from an outer fuel line directly to an inner fuel line, characterized in that: The connection block comprises: an inlet configured to be connected to an external fuel line; an outlet configured to connect to an internal fuel line; and A fuel accumulator is fluidly connected to the inlet and the outlet, the fuel accumulator is configured to direct fuel from the inlet to the outlet, the fuel accumulator defines a plug hole, the plug hole is configured to receive a plug that forms a seal with the fuel accumulator and is spatially separated from the inlet and the outlet.

19. The connection block system according to claim 18, characterized in that: The plug hole is arranged on the end of the connection block which is closest to the outlet.

20. The connection block system according to claim 18, characterized in that: The plug hole is arranged on the end of the connection block which is closest to the inlet.

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