An integrated fuel injection pipe in a gearbox

Abstract

The utility model provides a kind of integrated oil injection pipe in gearbox, including oil injection nozzle and extension section;Oil injection nozzle is communicated with other components in gearbox by extension section, and oil injection nozzle and extension section are integrally machined into shape;Step is formed between the inner side wall of oil injection nozzle and extension section;Wherein, the end of oil injection pipe away from other components in gearbox is prepared by the mode of first boring hole then cold heading forming oil injection nozzle;A kind of integrated oil injection pipe in gearbox by the utility model, can optimize the setting of oil injection pipe structure, improve the production efficiency of oil injection pipe, improve the security of oil injection pipe use, and then also conducive to the production capacity of the processed oil injection pipe.

Description

Technical Field

[0001] This utility model relates to the field of automotive technology, and more specifically, to an integrated fuel injection pipe in a transmission. Background Technology

[0002] Inside the gearbox, the fuel injection pipe needs to be inserted deep into complex cavities and precisely positioned. Its end is often designed with a special nozzle with a limiting structure to ensure accurate injection. Traditional manufacturing processes typically employ a split-processing strategy to achieve this: first, a separate metal nozzle part is machined, and then it is welded to the bent steel pipe body. This "split machining + welding" process not only significantly increases component costs due to the addition of a precision machined part, but also incurs high processing costs due to the introduction of welding procedures (including fixtures, operations, and potential quality control risks). Furthermore, the weld joints pose potential strength and sealing issues. Therefore, researching how to reduce the manufacturing cost of the nozzle in the fuel injection pipe and improve the stability and reliability of the fuel injection pipe in use is of great significance.

[0003] Patent CN119042307A discloses an electric drive transmission cooling and lubrication system and an automobile. This system includes an oil pump, a stator oil jacket, an injection pipe, and a pipeline switching device. The oil pump's inlet is connected to an external oil tank for conveying engine oil. The stator oil jacket is fitted onto the outside of the motor stator. The injection pipe's outlet faces the motor stator. The pipeline switching device forms a first cooling flow path and a second cooling flow path. The first cooling flow path is located between the oil pump's outlet and the injection pipe's inlet; the second cooling flow path is located between the oil pump's outlet and the stator oil jacket's inlet. This system can improve the cooling efficiency and system flexibility of the electric drive transmission. However, because the injection pipe is connected to a separate outlet, the high manufacturing cost and low stability of the nozzles in the injection pipe remain unresolved. Utility Model Content

[0004] In view of this, the present invention aims to propose an integrated fuel injector pipe in a gearbox to solve the problems of the traditional separate setting of the fuel injector pipe and the fuel outlet end in the prior art, which requires connection by a limiting structure, easily resulting in a more complex fuel injector pipe structure, higher component costs, and lower stability in use; thereby optimizing the setting of the fuel injector pipe structure, improving the production efficiency of the fuel injector pipe, improving the safety of the fuel injector pipe in use, and further helping to increase the production capacity of the processed fuel injector pipes.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] This utility model relates to an integrated fuel injector pipe in a gearbox, including a fuel injector and an extension section; the fuel injector is connected to other components in the gearbox through the extension section, and the fuel injector and the extension section are integrally machined; a step is formed between the fuel injector and the inner sidewall of the extension section, the wall thickness of the fuel injector is L1mm, the wall thickness of the extension section is L2mm, L1 / L2=e, where e is a positive number.

[0007] Furthermore, the fuel injection pipe is a hollow cylinder.

[0008] Furthermore, the fuel injector is prepared by first boring and then cold-forging the end of the fuel injection pipe away from other components in the gearbox.

[0009] Furthermore, the fuel injector is thinned by boring the fuel injector section and / or extension section of the fuel injector pipe to form a semi-finished fuel injector section, which is then formed into a finished fuel injector by cold forging.

[0010] Furthermore, the angle between the inner side of the fuel injector and the inner wall of the extension section is denoted as α, where α is a positive number.

[0011] Furthermore, the value of α ranges from 90° to 180°.

[0012] Furthermore, the fuel injector includes a side plate and a pipe sidewall; the bottom of the side plate is located at the top of the pipe sidewall, and the side plate is smoothly connected to the pipe sidewall by an arc.

[0013] Furthermore, the side panel contains an oil injection hole in the very center.

[0014] Furthermore, the diameter of the injection hole is d2mm, and the inner diameter of the injection pipe is denoted as d1mm; the value range of d2 / d1 is 20%-35%.

[0015] Furthermore, the selected length of the fuel injector is less than the overall length of the extension section.

[0016] Compared with the prior art, the integrated fuel injection pipe in the gearbox described in this utility model has the following advantages:

[0017] By installing the fuel injection pipe within the gearbox, the structure of the fuel injection pipe can be optimized, achieving integrated molding between the fuel injector and the fuel injection pipe, avoiding welding connections. This not only improves the production efficiency of the fuel injection pipe but also enhances the stability of the connection between the fuel injection pipe and the fuel injector, ensuring the strength between the fuel injector and the fuel injection pipe, thereby improving the safety of the fuel injection pipe in use. Attached Figure Description

[0018] The accompanying drawings, which constitute a part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments and descriptions of the utility model are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0019] Figure 1 This is a schematic diagram of an uncompressed steel pipe structure during the cold heading process.

[0020] Figure 2 This is a schematic diagram of the steel pipe structure after the initial compression during the cold heading process.

[0021] Figure 3 This is a schematic diagram of the steel pipe structure after secondary compression during the cold heading process.

[0022] Figure 4 This is a schematic diagram of the steel pipe structure after three compressions during the cold heading process.

[0023] Figure 5 This is a schematic diagram of the structure for thinning the sidewall of a steel pipe during the boring process.

[0024] Explanation of reference numerals in the attached drawings: 1. Injector nozzle; 11. Side plate; 12. Pipe sidewall; 2. Extension section. Detailed Implementation

[0025] The inventive concepts of this disclosure will be described below using terminology commonly used by those skilled in the art to convey the essence of their work to others skilled in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] In the existing technology, the previous product processing involved high-frequency heating of the metal tube ends to improve ductility, followed by cold forging. This method has the problems of high energy consumption, low production cycle, and poor safety.

[0029] To address the problems of traditional separate fuel injection pipes and outlet ends in existing technologies, which require a limiting structure for connection and result in complex pipe structures, high component costs, and low operational stability, this embodiment proposes an integrated fuel injection pipe for use within a transmission. The fuel injection pipe comprises a nozzle 1 and an extension section 2. The nozzle 1 connects to other components within the transmission via the extension section 2, improving the ease of installation between components and ensuring stable internal pressure, thereby enhancing user safety. The nozzle 1 and extension section 2 are integrally machined. The fuel injection pipe is a hollow cylinder. The length of the nozzle 1 is less than the overall length of the extension section 2. A step is formed between the inner walls of the nozzle 1 and the extension section 2. The wall thickness of the nozzle 1 is L1 mm, and the wall thickness of the extension section 2 is L2 mm. L1 < L2, and L1 / L2 = e, where e is a positive number, and the specific value of e is determined as needed.

[0030] By optimizing the fuel injection pipe's structure within the gearbox, the injector nozzle 1 and the fuel injection pipe can be integrally formed, avoiding welding connections. This improves fuel injection pipe production efficiency, enhances the stability of the connection between the fuel injection pipe and injector nozzle 1, ensures the strength of the injector nozzle 1 and the fuel injection pipe, and ultimately improves the safety of fuel injection pipe use. The step-like design between the injector nozzle 1 and the inner wall of the extension section 2 effectively reduces the impact of injector nozzle 1 bending on the extension section 2, improves the structural stability of the injector nozzle 1 and extension section 2, ensures the strength and rigidity of the injector nozzle 1 and extension section 2, and extends the service life of the fuel injection pipe.

[0031] Specifically, the end of the fuel injection pipe furthest from other components within the gearbox is manufactured by first boring and then cold-forging to obtain the fuel injector 1. The fuel injector 1 and / or the extension section 2 of the fuel injection pipe are thinned by boring to form a semi-finished fuel injection section. This semi-finished fuel injection section is then cold-forged to form the finished fuel injector 1. During the manufacturing process of the fuel injector 1, the included angle between the inner side of the fuel injector 1 and the inner wall of the extension section 2 is denoted as α, where α is a positive number. The value of α ranges from 90° to 180°.

[0032] By boring and then cold-forging, the end of the steel pipe is reduced from an open, large end to a small hole of a specified size, thus forming an oil spray hole without welding at the end of the steel pipe. This achieves the required oil spray hole functional structure for the product without adding other components. It effectively simplifies the component composition, reduces component costs, and streamlines the process, lowering processing costs.

[0033] The fuel injector 1 includes a side plate 11 and a pipe sidewall 12. The bottom of the side plate 11 is located at the top of the pipe sidewall 12 to close the fuel injection pipe. The side plate 11 and the pipe sidewall 12 are connected by a smooth arc. Furthermore, the side plate 11 contains a fuel injection hole at its center. The side plate 11 is annular. The diameter of the fuel injection hole is d2 mm, and the inner diameter of the fuel injection pipe is denoted as d1 mm. The value of d2 / d1 ranges from 20% to 35%.

[0034] By optimizing the structure of the components within the fuel injection pipe, the processing cost of the fuel injection pipe can be effectively reduced, the component composition can be simplified to reduce component costs, and the process flow can be simplified to reduce processing expenses.

[0035] A transmission includes the aforementioned integrated fuel injector pipe, the fuel injector pipe being disposed within the transmission.

[0036] This application changes the structure of welding machined parts to steel pipes to cold heading of the pipe ends, forming oil spray holes without welding, simplifying the part composition, reducing part costs, simplifying the process flow, and reducing processing costs.

[0037] A manufacturing process for a fuel injection pipe within a transmission, applicable to the aforementioned fuel injection pipe within a transmission, the process comprising the following steps:

[0038] Step 1: Material preparation: Select steel pipes of the required size and place them on a high-precision CNC machine tool;

[0039] Step 2, Pre-treatment: The sidewall of the steel pipe is thinned by boring to reduce the strength of the structure of the part to be processed on the steel pipe.

[0040] Step 3, Cold Forging: The steel pipe is subjected to n shrinkage processes at the end to be processed using a machine tool, reducing the first inner diameter d0mm of the steel pipe to a second inner diameter d2mm, thereby forming an oil injection pipe with injection holes. Here, n is a positive integer. The value of n is set according to requirements.

[0041] By configuring the fuel injection pipe, the structure of the fuel injection pipe can be optimized, the production efficiency of the fuel injection pipe can be improved, the energy consumption of the fuel injection pipe processing process can be reduced, the safety of the fuel injection pipe processing can be improved, and the production capacity of the processed fuel injection pipe can also be increased.

[0042] Step two includes:

[0043] Select a boring tool of the required size to thin the inner and / or outer walls of the selected steel pipe. The thinning process employs a combination of online monitoring and adaptive thinning. The boring tool includes one or more of the following: a boring bar, a cutting tool, a sensor, and a main controller. Furthermore, the sensor and cutting tool are mounted on the boring bar, and the main controller is connected to the sensor. The main controller can be mounted on the boring tool or wirelessly connected to the machine tool. This facilitates user adjustments and enables precise boring of the steel pipe. At least one sensor is required. The sensor includes one or more of the following: a force sensor, an acoustic emission sensor, and a vision probe.

[0044] By controlling the boring process in step two, stable thinning of the steel pipe can be effectively achieved. Furthermore, by monitoring the status of the cutting tool in real time, damage to the workpiece or machine tool can be reduced, and the protection for the user can be enhanced, ensuring the safety and reliability of the user's operation.

[0045] Alternatively, step two may include: selecting the required boring tool to thin the inner and / or outer walls of the selected steel pipe. The thinning process is performed using a boring tool. The boring tool may be any one or more of a drill bit, milling cutter, or turning tool.

[0046] Using boring tools for boring simplifies the boring process, reduces boring costs, and increases the flexibility of boring operations.

[0047] When n=3, step three includes:

[0048] Step S31: Cold heading process: The steel pipe is initially shrunk at the end to be processed using a machine tool. The inner diameter of the end to be processed is initially set to the first inner diameter d0mm, and then shrunk to the third inner diameter d3mm. Before and after processing, the outer wall offset of the steel pipe is α1 / 2. Here, α1 is the angular offset value of the initial shrinkage, and the specific value of α1 is set according to requirements. Preferably, α1 is 15°.

[0049] Step S32: Secondary shrinkage treatment: The port with an inner diameter of the third inner diameter d3mm is shrunk again to form a port with an inner diameter of the fourth inner diameter d4mm; before and after processing, the offset of the outer wall of the steel pipe is α2 / 2. Here, α2 is the angular offset value of the secondary shrinkage, and the specific value of α2 is set according to requirements. Preferably, α2 is 75°.

[0050] Step S33: Three-stage shrinkage process: The end of the steel pipe with the fourth inner diameter d4mm is subjected to a second shrinkage process to obtain an inner diameter of the second inner diameter d2mm; thus forming an oil injection pipe with an oil injection hole. Before and after processing, the outer wall offset of the steel pipe is 90°.

[0051] In step S31, during the initial shrinkage process, the shrunken inner diameter, i.e., the third inner diameter d3mm, is a% ± ε1 of the unshrunken inner diameter of the steel pipe's unprocessed end, i.e., the first inner diameter d0mm, where ε1 is the initial shrinkage deviation value. That is, d3 / d0 = a% ± ε1.

[0052] In step S32, during the secondary shrinkage process, d4 / d3 = b% ± ε2, where ε2 is the secondary shrinkage deviation value.

[0053] In step S33, during the three shrinkage processes, d2 / d4 = c% ± ε3, where ε3 is the deviation value of the three shrinkage processes. The specific values ​​of a, b, and c are set as needed. The values ​​of a, b, and c are between 0 and 1.

[0054] Preferably, the inner diameter of the unprocessed section of the fuel injection pipe is d1 less than and close to 6mm, d1 < d0; d3 is 3mm; d4 is 2mm; and d2 is 1.6 ± 0.2mm. However, the actual values ​​of d0, d1, d2, d3, and d4 are set according to requirements. Furthermore, d0, d1, d2, d3, and d4 are all positive numbers.

[0055] By employing multiple shrinkage processes, the traditional hot working method for fuel injection pipe manufacturing can be effectively replaced with cold working. By thinning the material through boring, the structural strength of the machined area is reduced, followed by cold forging. This method results in low energy consumption, high cycle time, and good safety. Furthermore, by thinning the material through boring and then cold forging, the functional structure of the product is achieved. The new process proposed in this application replaces hot working with cold working. After thinning the material through boring, the structural strength of the machined area is reduced, followed by cold forging, thus achieving low energy consumption, high cycle time, and good safety in fuel injection pipe manufacturing. It is worth noting that this application eliminates the heating process, which not only reduces the energy consumption required for fuel injection pipe manufacturing but also improves the safety of the manufacturing process; it also doubles the fuel injection pipe production capacity per unit time. Furthermore, the manufacturing process of the fuel injection pipe achieves cooling and lubrication functions.

[0056] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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. An integrated fuel injection pipe within a gearbox, characterized in that, It includes a fuel injector (1) and an extension section (2); the fuel injector (1) is connected to other components in the gearbox through the extension section (2), and the fuel injector (1) and the extension section (2) are integrally machined; a step is formed between the inner sidewall of the fuel injector (1) and the extension section (2), the wall thickness of the fuel injector (1) is L1mm, the wall thickness of the extension section (2) is L2mm, L1 / L2=e, and e is a positive number.

2. The integrated fuel injection pipe in a gearbox according to claim 1, characterized in that, The fuel injection pipe is a hollow cylinder.

3. The integrated fuel injection pipe in a gearbox according to claim 1, characterized in that, The fuel injector (1) is prepared by boring and then cold-forging the end of the fuel injection pipe away from other components in the gearbox.

4. The integrated fuel injection pipe in a gearbox according to claim 3, characterized in that, The fuel injector (1) is thinned by boring the fuel injector (1) part and / or extension section (2) part of the fuel injector pipe to form a semi-finished fuel injector part, and the semi-finished fuel injector part is formed into a finished fuel injector (1) by cold forging.

5. The integrated fuel injection pipe in a gearbox according to claim 3, characterized in that, The angle between the inner side of the fuel injector (1) and the inner wall of the extension section (2) is denoted as α, where α is a positive number.

6. The integrated fuel injection pipe in a gearbox according to claim 5, characterized in that, The value of α is 90°-180°.

7. The integrated fuel injection pipe in a gearbox according to claim 1, characterized in that, The fuel injector (1) includes a side plate (11) and a pipe side wall (12); the bottom of the side plate (11) is located at the top of the pipe side wall (12), and the side plate (11) and the pipe side wall (12) are connected by a smooth arc.

8. The integrated fuel injection pipe in a gearbox according to claim 7, characterized in that, The side plate (11) contains an oil injection hole at its center.

9. The integrated fuel injection pipe in a gearbox according to claim 8, characterized in that, The diameter of the injection hole is d2mm, and the inner diameter of the injection pipe is d1mm; the value range of d2 / d1 is 20%-35%.

10. The integrated fuel injection pipe in a gearbox according to claim 1, characterized in that, The selected length of the fuel injector (1) is less than the overall length of the extension section (2).

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