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AT-527359-A2 - FUEL INJECTION DEVICE FOR DIESEL ENGINE CYCLES AND METHOD FOR MANUFACTURING THE INJECTION DEVICE

AT527359A2AT 527359 A2AT527359 A2AT 527359A2AT-527359-A2

Abstract

The present invention aims to provide a fuel injection device suitable for engines operating in the diesel cycle, wherein the bore hole or channel has a universal and common dimension applicable to all models, types and sizes of injectors. In addition, a method for manufacturing this bore hole is provided, which leads to cost reductions, process simplification, improvement in efficiency and quality, while allowing greater flexibility in production. The channel described is suitable for all types and sizes of injectors, adapts to all known designs and can therefore be used in all injector housings.

Assignees

  • ROBERT BOSCH LTDA

Dates

Publication Date
20241215
Application Date
20241017
Priority Date
20240705

Claims (6)

  1. (345746.8) Claims 1. Fuel injection device for diesel engines, equipped with a main channel (1) for the fuel flow, which is connected to a inlet region (12), an outlet region (13) and a main channel center line (11), the main channel being delimited by a wall (2); ° with an outer side region (21) which is connected to the wall (2); ° with an intermediate channel (30) which extends from the outer side region (21) to the main channel (1) and is provided with a center line (axis) of the intermediate channel (31); ° with a secondary channel (4) which is connected to the inlet region of the main channel (12) and extends to the intermediate channel (3); ° with at least one holding element 5; the device being characterized in that the intermediate channel (3) ° has an inner diameter of the intermediate channel (33) of greater than or equal to 2.0 millimeters and less than or equal to 2.5 millimeters; ° comprises an intermediate channel inlet region (32) provided with a bevel (34) forming an angle (344) of between 10 and 30 degrees and a bevel length (341) of at least 0.5 millimeters between a bevel start (342) and a bevel end (343); ° is provided with a region of controlled roughness (35) positioned adjacent to the intermediate channel inlet region (32) and extending over at least 0.5 millimetres from the end of the bevel (343) to the retaining element can be assigned.
  2. 2. Fuel injection device according to claim 1, characterized in that the intermediate channel (3) ° has an inner diameter of the intermediate channel (33) of greater than or equal to 2.20 millimeters and less than or equal to 2.35 millimeters; ° comprises an intermediate channel inlet region (32) provided with a bevel (34) forming an angle (344) between 18 and 22 degrees and having a bevel length (341) of at least 0.9 millimeters; ° comprises a region of controlled roughness (35) extending over at least 1.6 millimeters.
  3. 3. Fuel injection device according to claim 1, characterized in that the inner diameter of the intermediate channel (33) is at least 2.25 millimeters and not more than 2.30 millimeters.
  4. 4. Fuel injection device according to claim 1, characterized in that the intermediate channel inlet region (32) is provided with a bevel (34) which forms an angle (344) between 19 degrees and 7 minutes and 20 degrees and 3 minutes.
  5. 5. Method for manufacturing the injector device according to claims 1 to 4, characterized in that the steps for manufacturing the intermediate channel (3) comprise ° the manufacture of an intermediate channel hole (3) from the external side region (21) to which a connection is to be made with the main channel (1) in order to establish an angle of less than or equal to 90 degrees between the center line of the intermediate channel (31) and the center line of the main channel (11); ° the execution of a bevel (34) in an intermediate channel entrance area (32); retaining element can be assigned.
  6. 6. Manufacturing method according to claim 4, characterized in that the steps ° for making a hole for the intermediate channel (3), and ° for performing a bevel (34) carried out simultaneously and/or sequentially.

Description

[0001] The present invention relates to a fuel injection device for Diesel engines and the manufacturing process of the said injection device. STATE OF THE ART [0002] The common rail injector for commercial vehicles (CRIN) is a type of high-pressure fuel injection nozzle used in commercial vehicles such as trucks, buses and other heavy vehicles. It is part of the common rail injection system, a high-pressure fuel injection system used in modern diesel engines is used. [0003] The function of the CRIN is to deliver fuel to the engine's combustion chamber in a precise and controlled manner. This is crucial to ensure efficient combustion of the fuel, reduce emissions and improve engine performance. CRIN operates at high pressure, which enables fine and uniform atomization of the fuel and leads to a more complete and more efficient combustion. [0004] CRIN operation begins with the supply of fuel under high pressure to the common rail system. This system consists of a high-pressure fuel reservoir (the "common rail") that supplies the individual injectors. CRIN is electronically controlled and works synchronously with the engine. When the electronic injection system sends a signal, the CRIN releases the fuel under high pressure towards the combustion chamber, where it is atomized into fine droplets to ensure efficient combustion. to ensure a long and reliable service life. [0006] In this way, the common rail injector for commercial vehicles plays a crucial role in the common rail injection system by supplying fuel to the diesel engines of commercial vehicles in a precise and controlled manner, thus contributing to efficient performance, reduced emissions and engine life. [0007] The CRIN (Common Rail Injector for Commercial Vehicle) system uses a fuel return system to ensure that excess fuel is returned to the fuel tank. This is important to maintain the correct pressure in the system and to ensure the proper functioning of the CRIN to ensure. [0008] A feature of the CRIN is that a portion of the fuel injected into the combustion chamber is not burned and returns to the fuel system. This unburned fuel is collected and fuel return system back into the fuel tank. [0009] The return of the diesel is controlled by a pressure relief valve that regulates the amount of fuel recycled. When the pressure in the common rail system reaches a set level, the pressure relief valve opens and allows the fuel to return to the tank. This helps to keep the pressure in the system within operating limits and avoid excessive pressure build-up that could damage the could damage components of the injection system. [0010] In addition, the recycling of diesel also helps to Keep the fuel temperature under control, as the fuel entering the tank to dissipate heat. [0011] The recirculation of diesel in the CRIN is an essential part of the common rail injection system and ensures that the fuel is recirculated efficiently and in a controlled manner, keeping the pressure and temperature of the system within the operating limits. This contributes to the reliable performance and durability of the fuel injection system in commercial vehicles. [0012] For common rail injectors for commercial vehicles (CRIN) injectors, it is important to distinguish between two types of fuel return: gallery return (rail) and injector return. These two returns have different functions and occur for different reasons. [0013] On the fuel return from the gallery (rail): ° this return serves to prevent the pressure in the fuel gallery (rail) from becoming too high; ° the fuel gallery stores the fuel under high pressure, ready for injection into the cylinders. To keep the pressure within a safe and efficient range, any excess pressure is released by a pressure regulator or safety valve that allows the fuel to flow back into the tank; ° when the pressure in the fuel gallery exceeds a predefined limit, the control valve opens and lets the fuel into the tank flow back to reduce the pressure. [0014] Now, to the fuel return of the injector: ° this return is a normal function of the injector and is used to manage internal leaks and control the injection; ° the fuel that flows back from the injector can be due to two main factors: a. the injectors can be used for fuel injection due to their high precision and fine manufacturing tolerances have low internal leakage; and a pressure increase at the injector is avoided. [0015] In this way, the return flow from the fuel gallery serves to control the pressure in the fuel gallery and to avoid excessively high pressures. The return flow of the injector occurs due to unavoidable internal leaks of the injector and the fuel used to control the injection is used. [0016] Both return systems are crucial for the efficient and safe operation of the common rail injection system. They ensure that the pressure is kept within safe operating limits and that the injectors function properly. [0017] What enables diesel backflow is called a “bore hole”. A “bo