A V-type multi-cylinder diesel engine through-cylinder wire harness device

Abstract

The utility model relates to a kind of V-shaped arrangement's multi-cylinder diesel engine cylinder-penetrating wire harness device, it is related to the field of diesel engine, it includes cylinder-penetrating wire harness, cylinder-penetrating piece being installable on cylinder cover and being supplied for cylinder-penetrating wire harness to pass through, and wire harness support being installable on cylinder cover and being equipped with cylinder-penetrating wire harness, wire harness support is integrally formed with bending structure at its both ends and middle part, wherein one end bending structure width direction is perpendicular with middle part bending structure width direction, the other end bending structure width direction and middle part bending structure width direction form acute angle included angle between it. The utility model is favorable to improve assembly efficiency, reduce production cost, avoid exhaust side high-temperature heat damage.

Description

Technical Field

[0001] This utility model relates to the technical field of diesel engines, and in particular to a cylinder wiring harness device for a V-shaped multi-cylinder diesel engine. Background Technology

[0002] With the continuous advancement of diesel engine electronic control technology, common rail fuel injection technology has been widely applied to high-power engines with multi-cylinder V-type configurations. In this engine structure, each cylinder head requires a through-cylinder structure to connect the in-cylinder wiring harness to the injector signal, with the other end connected to the engine control unit (ECU) to ensure precise control of fuel injection. This technology plays a crucial role in improving engine performance and efficiency.

[0003] However, in multi-cylinder diesel engines, especially large engines with a high number of cylinders such as 12, 16, and 20, existing in-cylinder wiring harness layout schemes have significant limitations and problems. Currently, the common practice is to pass the in-cylinder wiring harness through the cylinder head, support it with a wiring harness bracket, and secure it with high-temperature rolled steel tape before finally connecting it to the injector terminals. This arrangement is particularly problematic in V-type engines, especially when the exhaust system is located on the outside of the engine, requiring the wiring harness to pass through the cylinder from the exhaust side. Because the space between exhaust manifolds is very small, and the exhaust system operates at extremely high temperatures, the wiring harness passing through the cylinder is susceptible to thermal damage. For power plant engines that require continuous rated operation, this thermal damage not only increases potential safety risks but also leads to a significant increase in the cost of wiring harness thermal protection.

[0004] Furthermore, the existing design of the cylinder bypass component's location also has flaws. In V-type engines, the cylinder bypass component is usually located on the lower side due to the cylinder head's structural design. However, this location often places the cylinder bypass component in the oil cavity area, significantly increasing the risk of oil leaks and seepage. These problems not only affect the engine's reliability and durability but also increase maintenance costs and repair complexity. Utility Model Content

[0005] The purpose of this utility model is to provide a V-shaped arrangement of in-cylinder wiring harness for multi-cylinder diesel engines. This in-cylinder wiring harness does not require binding with tape, has a small wiring space, and a simple assembly process, thereby improving the assembly efficiency of in-cylinder wiring harnesses in engines with independent cylinder heads.

[0006] To achieve the above objectives, the present invention provides a V-shaped multi-cylinder diesel engine through-cylinder wiring harness device, including through-cylinder wiring harness, through-cylinder component that can be installed on the cylinder head and through which the through-cylinder wiring harness passes, and wiring harness bracket that can be installed on the cylinder head and on which the through-cylinder wiring harness is mounted. The wiring harness bracket has a bent structure integrally formed at both ends and in the middle, wherein the width direction of the bent structure at one end is perpendicular to the width direction of the bent structure in the middle, and the width direction of the bent structure at the other end forms an acute angle with the width direction of the bent structure in the middle.

[0007] Preferably, the through-cylinder wiring harness is provided with a wiring harness sheath at the corresponding position of the bending structure of the wiring harness bracket.

[0008] Preferably, the opening direction of the bending structure in the middle of the wire harness bracket is opposite to the opening direction of the bending structures at both ends.

[0009] Preferably, the center of the bending diameter of the middle bending structure of the wire harness bracket differs from the center of the bending diameter of the bending structures at both ends by 2mm.

[0010] Preferably, the buckle arc diameter of the bending structure of the wire harness bracket is 5mm.

[0011] Preferably, the bending wire width of the wire harness bracket bending structure is 15mm.

[0012] Preferably, the end of the cylinder wiring harness is provided with a nut terminal for connecting to the fuel injector.

[0013] Preferably, the wire harness bracket and the rocker arm seat's fixing pad are integrally connected.

[0014] Preferably, the cylinder insert is located between the two push rods.

[0015] Preferably, the material of the wire harness bracket is Q235A.

[0016] Compared with the prior art, the advantages of this utility model's in-cylinder wiring harness arrangement scheme for multi-cylinder diesel engines are as follows:

[0017] 1) This utility model's in-cylinder wiring harness design for multi-cylinder diesel engines offers significant assembly advantages. Its structure is simple and easy to operate. Hexagonal head screws are used to fix the through-cylinder components to the engine cylinder head, and solid terminals integrate the wiring harness, thermoplastic tubing sheath, and nut terminals into a single unit. During assembly, only manual operation is required; no special tools are needed to quickly install and fix the wiring harness bracket. This design is particularly suitable for assembly operations in confined spaces, significantly improving assembly efficiency, reducing assembly difficulty, and providing great convenience for engine manufacturing.

[0018] 2) This invention excels in mitigating heat damage and reducing the risk of oil leaks. The multi-cylinder diesel engine's in-cylinder wiring harness adopts a V-shaped arrangement design, with the cylinder-penetrating component located inside the intake manifold. This effectively avoids high-temperature heat damage from the exhaust side, ensuring the stability and safety of the wiring harness in high-temperature environments and reducing thermal protection costs. Simultaneously, because the cylinder-penetrating component is positioned high in the cylinder head, an oil sump cannot form around it, significantly reducing the risk of oil leaks and enhancing the engine's reliability and durability. This design optimizes the engine's internal layout and operating environment, providing a solid guarantee for the engine's long-term stable operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the in-cylinder wiring harness structure of the multi-cylinder diesel engine of this utility model;

[0020] Figure 2 This is a schematic diagram of the in-cylinder wiring harness of the multi-cylinder diesel engine of this utility model from another perspective.

[0021] Figure 3 This is a schematic diagram of the multi-cylinder diesel engine in-cylinder wiring harness from two opposite perspectives.

[0022] Figure 4 This is a schematic diagram of the in-cylinder wiring harness of a multi-cylinder diesel engine from another perspective.

[0023] Figure 5 These are schematic diagrams of the wiring harness bracket for a single cylinder head in-cylinder wiring harness in a multi-cylinder diesel engine, taken from two different perspectives.

[0024] Figure 6 This is a schematic diagram of the in-cylinder wiring harness of a multi-cylinder diesel engine after the wiring harness is aggregated outside the cylinder according to this utility model;

[0025] Figure 7 These are schematic diagrams showing the in-cylinder wiring harness bracket of this utility model from three different perspectives.

[0026] Reference numerals in the attached diagram: 1. In-cylinder wiring harness assembly; 11. Through-cylinder wiring harness; 12. Through-cylinder component; 13. Wiring harness sheath; 14. Wiring harness bracket; 141. Bend 1; 142. Bend 2; 143. Bend 3; 15. Nut terminal; 2. Cylinder head; 3. Push rod; 4. Injector; 5. Intake rocker arm; 6. Exhaust rocker arm; 7. Rocker arm seat; 8. Rocker arm seat fixing bolt; 9. Through-cylinder component fixing bolt. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] This utility model discloses a V-shaped multi-cylinder diesel engine through-cylinder wiring harness device, including a through-cylinder component 12, a through-cylinder wiring harness 11, a wiring harness sheath 13, a nut terminal 15, and a wiring harness bracket 14. The device fixes the through-cylinder component 12 and the wiring harness bracket 14 to the cylinder head 2. The wiring harness sheath 13 is installed and fixed using three guide bends (bend one 141, bend two 142, and bend three 143) of the wiring harness bracket 14, thereby achieving a stable arrangement of the through-cylinder wiring harness 11. The wiring harness sheath 13, after thermoforming, is installed on the through-cylinder wiring harness 11 and fixed through the bends of the wiring harness bracket 14. Each through-cylinder wiring harness 11 has one connector and two terminals, forming the in-cylinder wiring harness for one cylinder in a V-shaped multi-cylinder arrangement.

[0029] The cylinder guide 12 passes through the cylinder head 2 inside the V-shaped engine cylinder head. Its cylinder guide hole is designed to be positioned in the middle relative to the two push rods 3 to ensure the stability and reliability of the cylinder guide 12. The cylinder guide 12 is secured using cylinder guide fixing bolts 9 (hex socket head cap screws), ensuring its stability during engine operation. The cylinder guide wiring harness 11 is covered with a high-temperature resistant sheath (wiring harness sheath 13) to protect the wiring harness's performance in high-temperature environments.

[0030] The wiring harness bracket 14 and the rocker arm seat 7 have an integrated fixing pad design with three guide bends (bend 141, bend 242, and bend 3143) for installation, fixing, and guidance. The wiring harness bracket 14 is installed between the intake rocker arm 5 and the exhaust rocker arm 6 to ensure stable arrangement of the wiring harness in a confined space. Two nut terminals 15 are connected to the injector 4 to realize the transmission of electronic control commands from the injector 4. The through-cylinder wiring harness 11 is arranged in a V-shape to form the through-cylinder wiring harness 11 of a multi-cylinder diesel engine. The inner side of the V-shaped multi-cylinder engine is the intake side to avoid high-temperature heat damage from the exhaust side.

[0031] The in-cylinder wiring harness assembly 1 consists of multiple V-shaped through-cylinder wiring harnesses 11, including a through-cylinder member 12 located on one side of the single-cylinder cylinder head 2, a wiring harness bracket 14 located on the top of the rocker arm seat 7, multiple wiring harness sleeves 13 located on the through-cylinder wiring harnesses 11, nut terminals 15 located at the end of the through-cylinder wiring harnesses 11 for connection with the injector 4, two rocker arm seat fixing bolts 8 for fixing the wiring harness bracket 14 to the rocker arm seat 7, and through-cylinder member fixing bolts 9 for fixing the through-cylinder member 12. The through-cylinder member 12 is located on the intake side of the cylinder head 2, and its through-cylinder hole is located in the middle of the cylinder head 2 relative to the two intake and exhaust push rods 3. One end of the through-cylinder wiring harness 11 has the through-cylinder member 12, and the other end has two nut terminals 15. The bending clip of the wire harness bracket 14 has an arc diameter of 5mm. The opening direction of bend 2 142 is opposite to that of bend 1 141 and bend 3 143. Furthermore, the center of the bending diameter of bend 1 141 differs from the center of the bending diameter of bend 2 142, and the center of the bending diameter of bend 2 142 differs from the center of the bending diameter of bend 3 143 by 2mm, thus providing a reverse constraint on the opening of the wire harness bracket 14. The width of the bending clip is 15mm. The material of the wire harness bracket 14 is Q235A, and the temperature resistance rating of non-metallic parts such as the wire harness sheath 13 is 150℃. The through-cylinder wire harness 11 is a 150℃ high-temperature resistant conductor. In this design, the width direction of the first bend 141 of the wire harness bracket 14 is perpendicular to the width direction of the second bend 142, and the width direction of the third bend 143 forms an acute angle with the width direction of the second bend 142. The acute angle is preferably 45°. This design helps the wire harness to be flexibly arranged in complex spaces, while ensuring the stability and reliability of the wire harness.

[0032] The V-shaped multi-cylinder diesel engine through-cylinder wiring harness 11 device involved in this utility model has a simple assembly process and is easy to operate, which can significantly improve the assembly efficiency of the in-cylinder wiring harness of multi-cylinder diesel engines. By passing through the cylinder from the intake side of the cylinder head 2, it avoids the high temperature damage on the exhaust side, prevents oil accumulation around the through-cylinder part 12, and reduces the requirements for through-cylinder sealing, which is conducive to improving the reliability of the through-cylinder part 12.

[0033] In practical implementation, the cylinder head 2, pushrod 3, injector 4, intake rocker arm 5, exhaust rocker arm 6, and rocker arm seat 7 are assembled into a single unit in a V-shaped arrangement. The cylinder pass 12 is fixed to the cylinder head 2, with its cylinder pass hole located between the two pushrods 3. Its mounting surface is flush with the cylinder head 2. The cylinder pass 12 is fitted with a steel sleeve and secured by cylinder pass fixing bolts 9. The cylinder pass wiring harness 11 passes through the wiring harness sheath 13 and is thermoplasticized to form a single unit, remaining flexible and bendable. It is then guided through the wiring harness bracket 14 to the vicinity of the injector 4. Three bending clips (bend one 141, bend two 142, and bend three 143) on the wiring harness bracket 14 secure and guide the cylinder pass wiring harness 11. The in-cylinder wiring harness, after being thermoplasticized with an additional sheath, matches the bending radius of the wiring harness bracket 14, thus securing the wiring harness. The wire harness bracket 14 has a reverse flange at the snap-fit ​​end, which guides the wire harness installation and will not scratch the wire harness insulation surface. Compared with plastic brackets, it saves a lot of space for wire harness installation and layout.

[0034] The multi-cylinder diesel engine in-cylinder wiring harness assembly 1 consists of several (16 in this embodiment) through-cylinder wiring harnesses 11 assembled outside the cylinder. One end connects to the injector 4, and the other end connects to the ECU to transmit the injector 4 control signal. The intake rocker arm 5 and exhaust rocker arm 6 are fixed to the rocker arm seat 7 by rocker arm seat fixing bolts 8. The tightening torque of the rocker arm seat fixing bolts 8 is relatively large. The rocker arm seat 7 is a casting, so a rocker arm seat 7 gasket needs to be designed. The wiring harness bracket 14 and the rocker arm seat 7 gasket are designed together and use Q235A steel plate, which has excellent mechanical strength, plasticity, and oil and corrosion resistance. With its fixing and guidance, the in-cylinder wiring harness is easy and quick to install in a confined space, and it also avoids the rocker arm seat 7 being crushed and the tightening torque of the rocker arm seat 7 bolts changing.

[0035] The advantages of this utility model of multi-cylinder high-power diesel engine through-cylinder wiring harness 11 are as follows:

[0036] The assembly process of this utility model is extremely convenient, mainly due to the wiring harness bracket 14 with bending guidance and fixing functions. This bracket 14 also integrates the gasket function of the rocker arm seat 7, achieving a unified functional design. During assembly, only one hexagonal head screw is needed to fix the cylinder head 12 to the engine cylinder head 2, and the nut terminal 15 is connected to the injector 4. The guiding and fixing operations of the wiring harness bracket 14 can be completed manually, without the need for other tools or complex processes such as torque control. This design allows for quick-connect assembly in a limited and confined space, significantly improving the assembly efficiency of multi-cylinder independent cylinder distribution diesel engines.

[0037] Considering the complexity of the internal environment of the diesel engine cylinder head 2, including high temperature, vibration, sealing requirements, and oil resistance, this device is designed to fully take into account the vibration resistance, oil leakage prevention, and structural strength of the cylinder head 12 and the in-cylinder wiring harness. By adopting a V-shaped arrangement of multiple single cylinder heads 2 and penetrating the cylinder from the intake side (i.e., the inner side of the V-shaped arrangement), the high-temperature heat damage on the exhaust side is effectively avoided. At the same time, since the inner wall of the rocker arm side of the cylinder head 2 is in a higher position, there is no problem of oil accumulation, thereby reducing the requirements for cylinder penetration sealing and improving the reliability of the cylinder head 12. The gasket of the rocker arm seat 7 and the wiring harness bracket 14 adopt a combined design, reducing the use of special components and thus saving costs.

[0038] The cylinder insert 12 can be designed as a split cylinder insert structure, connected by plug-in connectors. This design greatly facilitates maintenance, disassembly, assembly, and troubleshooting.

[0039] It should be noted that the cylinder head 2, rocker arm seat 7, intake rocker arm 5, exhaust rocker arm 6, and fuel injector 4 are all conventional components on the engine, and the relevant knowledge of these components falls within the scope of common knowledge that those skilled in the art should know.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A V-shaped arrangement of through-cylinder wiring harnesses for a multi-cylinder diesel engine, characterized in that, The device includes a cylinder-through wiring harness (11), a cylinder-through component (12) that can be installed on the cylinder head (2) and through which the cylinder-through wiring harness (11) passes, and a wiring harness bracket (14) that can be installed on the cylinder head (2) and on which the cylinder-through wiring harness (11) is mounted. The wiring harness bracket (14) has a bent structure integrally formed at both ends and in the middle. The width direction of the bent structure at one end is perpendicular to the width direction of the bent structure in the middle, and the width direction of the bent structure at the other end forms an acute angle with the width direction of the bent structure in the middle.

2. The V-shaped multi-cylinder diesel engine through-cylinder wiring harness device according to claim 1, characterized in that, The through-cylinder wiring harness (11) is provided with a wiring harness sheath (13) at the corresponding position of the bending structure of the wiring harness bracket (14).

3. The V-shaped arrangement of the multi-cylinder diesel engine through-cylinder wiring harness according to claim 2, characterized in that, The opening direction of the bending structure in the middle of the wire harness bracket (14) is opposite to the opening direction of the bending structures at both ends.

4. The V-shaped arrangement of the multi-cylinder diesel engine through-cylinder wiring harness according to claim 3, characterized in that, The center of the bending diameter of the middle bending structure of the wire harness bracket (14) differs from the center of the bending diameter of the bending structures at both ends by 2 mm.

5. A V-shaped multi-cylinder diesel engine through-cylinder wiring harness device according to claim 4, characterized in that, The buckle arc diameter of the bending structure of the wire harness bracket (14) is 5mm.

6. A V-shaped multi-cylinder diesel engine through-cylinder wiring harness device according to claim 5, characterized in that, The bending wire width of the bending structure of the wire harness bracket (14) is 15mm.

7. A V-shaped multi-cylinder diesel engine through-cylinder wiring harness device according to any one of claims 1-6, characterized in that, The end of the cylinder wiring harness (11) is provided with a nut terminal (15) for connecting the injector (4).

8. A V-shaped multi-cylinder diesel engine through-cylinder wiring harness device according to any one of claims 1-6, characterized in that, The wiring harness bracket (14) is integrally connected to the fixing pad of the rocker arm seat (7).

9. A V-shaped multi-cylinder diesel engine through-cylinder wiring harness device according to any one of claims 1-6, characterized in that, The cylinder insert (12) is located between the two push rods (3).

10. A V-shaped multi-cylinder diesel engine through-cylinder wiring harness device according to any one of claims 1-6, characterized in that, The material of the wire harness bracket (14) is Q235A.

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