Anti-loosening fastening device for position sensor of fuel rack of diesel engine

Abstract

The utility model provides an anti-loosening fastening device for a diesel engine fuel rack position sensor, and belongs to the technical field of diesel engine fuel control systems. Comprising a fuel rack position sensor; the sensor mounting bracket is used for fixing a fuel rack position sensor, and the fuel rack position sensor penetrates through a mounting hole of the sensor mounting bracket; the wedge-shaped locking washers are arranged on the two sides of the fuel rack position sensor respectively; and the thin-wall nuts are respectively matched with the wedge-shaped locking washers and are screwed with the outer surface of the fuel rack position sensor through threads, so that the fuel rack position sensor is fastened on the sensor mounting bracket. Wherein each wedge-shaped locking washer comprises two washers which are meshed with each other through wedge-shaped teeth, and the wedge-shaped tooth surfaces of the wedge-shaped locking washers are in a vertical jacking state, so that the nut is prevented from loosening under the vibration environment of an engine. The device is simple in structure, good in anti-loosening effect and capable of accurately controlling the position gap of the sensor, ensuring the detection precision of a fuel control system and improving the performance of an engine.

Description

Technical Field

[0001] This utility model belongs to the technical field of diesel engine fuel control system, specifically relating to a diesel engine fuel rack position sensor anti-loosening fastening device. Background Technology

[0002] The fuel rack position sensor in a diesel engine is a key component of the engine control system. It detects the position of the fuel rack and feeds this information back to the control system for precise control of the fuel injection quantity. Its structure and detection method are crucial for the normal operation of the engine. The amount of fuel injected during diesel engine operation determines whether combustion is complete under current operating conditions. Coupled with increasingly stringent environmental pollution requirements, stable performance and low emissions diesel engines have become a key research topic in the international engine industry.

[0003] In existing technologies, such as Figure 3 As shown, fuel rack position sensors are typically secured using standard anti-loosening washers or nuts. However, due to the intense vibrations in the diesel engine's operating environment, and the extremely high positional accuracy required of the fuel rack position sensor (gap requirement of 0.25mm-1mm), and because of the inherent structural characteristics of the sensor's threads, existing anti-loosening structures are prone to loosening under long-term vibration, leading to sensor position deviation. Once the fuel rack position sensor becomes loose, the signal fed back to the control system will deviate from the actual value, directly affecting engine performance, emissions, fuel economy, and reliability. Therefore, ensuring that the diesel engine fuel rack position feedback sensor is properly, stably, and reliably secured under any operating condition and throughout any effective operating cycle is crucial.

[0004] A search of existing technologies revealed no solution for securing fuel rack position sensors using a combination of wedge-shaped locking washers and thin-walled nuts. Therefore, there is an urgent need for a sensor securing device that can maintain stable fastness over long periods under conditions of strong vibration. Utility Model Content

[0005] The technical problem solved by this utility model is to provide a diesel engine fuel rack position sensor anti-loosening fastening device. This utility model aims to overcome the shortcomings of the prior art and provide a diesel engine fuel rack position sensor anti-loosening fastening device with simple structure and good anti-loosening effect.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] The diesel engine fuel rack position sensor anti-loosening fastening device includes:

[0008] Fuel rack position sensor, used to detect the position of the engine fuel rack;

[0009] A sensor mounting bracket is used to fix the fuel rack position sensor, which passes through the mounting hole of the sensor mounting bracket;

[0010] A pair of wedge-shaped locking washers are respectively disposed on both sides of the fuel rack position sensor;

[0011] A pair of thin-walled nuts, which respectively mate with the wedge-shaped locking washers, are screwed into the threads on the outer surface of the fuel rack position sensor to fasten the fuel rack position sensor onto the sensor mounting bracket.

[0012] The wedge-shaped locking washer is in a vertically tightened state to prevent the thin-walled nut from loosening under engine vibration.

[0013] Further defining the above scheme, each wedge-shaped locking washer includes: washer I and washer II, which are coaxially aligned and tightly attached. The surfaces of the two washers that are in contact with each other are provided with interlocking inner wedge-shaped teeth, and the surfaces of the two washers that are far apart are provided with outer wedge-shaped teeth.

[0014] Further specifying the above scheme, the inclination angle of the inner wedge-shaped tooth is 5°-15°; the tooth tip width of the inner wedge-shaped tooth is 0.5-0.9mm;

[0015] The inclination angle of the outer wedge-shaped teeth is 5°-15°; the tooth tip width of the outer wedge-shaped teeth is 0.1-0.3mm;

[0016] The outer diameter of the wedge-shaped locking washer matches the outer diameter of the thin-walled nut.

[0017] As a further specification of the above scheme, the wedge-shaped locking washer is made of stainless steel.

[0018] Further defining the above solution, the thickness of the thin-walled nut is 2-3mm, and the surface in contact with the wedge-shaped locking washer is provided with anti-slip texture.

[0019] Advantages of this utility model compared to the prior art:

[0020] 1. This solution has excellent anti-loosening performance: The combination structure of wedge-shaped locking washers and thin-walled nuts, through the interlocking action of wedge-shaped teeth and the cooperation of anti-slip texture, can maintain stable fastening even under strong vibration environment, solving the problem of easy loosening of traditional fixing methods;

[0021] 2. This solution features precise position control: it can precisely control the gap between the fuel rack position sensor and the mounting bracket within a suitable range, ensuring position detection accuracy and improving the response accuracy of the engine control system;

[0022] 3. This solution has a simple and reliable structure: it only requires the addition of a wedge-shaped locking washer to the existing structure, without complicated modifications, easy installation, low cost, and is suitable for various types of diesel engines;

[0023] 4. This solution is highly adaptable: it adopts a standard parts design, which can adapt to the installation requirements of sensors with different diameters, and has good versatility and interchangeability;

[0024] 5. This solution improves engine performance: By ensuring the stable fixation of the fuel rack position sensor, it helps to achieve precise fuel control, thereby improving engine power performance, reducing emissions, and improving fuel economy. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the anti-loosening fastening device for the diesel engine fuel rack position sensor of this utility model;

[0026] Figure 2 This is an exploded view of the anti-loosening fastening device for the diesel engine fuel rack position sensor of this utility model;

[0027] Figure 3 This is a schematic diagram of the fastening structure of a fuel rack position sensor in the prior art. Detailed Implementation

[0028] 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 scope of protection of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Please see Figure 1-3 The embodiments of this utility model are described in detail below.

[0032] Example: See Figure 1-3 As shown, the anti-loosening fastening device for the diesel engine fuel rack position sensor includes: a fuel rack position sensor 1 for detecting the position of the engine fuel rack; a sensor mounting bracket 4 for fixing the fuel rack position sensor 1, wherein the fuel rack position sensor 1 passes through the mounting hole of the sensor mounting bracket 4; a pair of wedge-shaped locking washers 3 respectively disposed on both sides of the fuel rack position sensor 1; and a pair of thin-walled nuts 2 respectively cooperating with the wedge-shaped locking washers 3 and screwing into the threads on the outer surface of the fuel rack position sensor 1 to fasten the fuel rack position sensor 1 to the sensor mounting bracket 4.

[0033] During installation, first place the fuel rack position sensor 1 into the mounting hole of the sensor mounting bracket 4. Then, place a wedge-shaped locking washer 3 on each side of the fuel rack position sensor 1. Finally, tighten the thin-walled nut 2 by screwing it onto the threaded outer surface of the fuel rack position sensor 1. This structure ensures that the fuel rack position sensor does not loosen, achieving a secure fastening effect. It features a simple structure, good anti-loosening effect, and precise control of the sensor position gap, ensuring the detection accuracy of the fuel control system and improving engine performance.

[0034] In this configuration, the wedge-shaped locking washer 3 has its wedge-shaped teeth in a vertically tightened state, preventing relative sliding between the two washers and thus preventing the thin-walled nut 2 from loosening under engine vibration. This stabilizes the fuel rack position sensor, ensuring that the control system receives the correct signal for precise fuel control.

[0035] This wedge-shaped locking washer is applied to both sides of the fuel rack position sensor in a diesel engine. It can be directly installed and tightened to achieve the anti-loosening and fastening function of the fuel rack position sensor, which is simple and practical to operate.

[0036] When the diesel engine is running, the wedge-shaped locking washer can secure the fuel rack position sensor, continuously and stably outputting the current real-time fuel rack position to the control system, so that the diesel engine can achieve the best operating state, optimal emission index and economic index under different operating conditions.

[0037] Specifically, each of the wedge-shaped locking washers 3 includes: washer I 3-1 and washer II 3-2. Washers I 3-1 and washer II 3-2 are coaxially close to each other. The surfaces of the two washers that are in contact with each other are provided with interlocking inner wedge-shaped teeth 3-3, and the surfaces of the two washers that are far apart are provided with outer wedge-shaped teeth 3-4.

[0038] Preferably, the inclination angle of the inner wedge-shaped tooth 3-3 is 5°-15°; the tooth tip width of the inner wedge-shaped tooth 3-3 is 0.5-0.9mm;

[0039] Preferably, the inclination angle of the outer wedge-shaped teeth 3-4 is 5°-15°; the tooth tip width of the outer wedge-shaped teeth 3-4 is 0.1-0.3mm.

[0040] When assembling the fuel rack position sensor, a wedge-shaped locking washer is added to each side. Utilizing the anti-loosening principle of the wedge-shaped locking washer, a wedge shape is formed on both sides of the fuel rack position sensor, at the mounting point of the fixed bracket, and on the nut side. The wedge teeth will mesh with each other, forming a self-locking effect to prevent the fuel rack position sensor from loosening, thereby improving the sampling accuracy of the control system.

[0041] Preferably, the outer diameter of the wedge-shaped locking washer 3 matches the outer diameter of the thin-walled nut 2 to ensure good force distribution.

[0042] Preferably, the wedge-shaped locking washer 3 is made of stainless steel, which ensures sufficient strength and has a certain degree of elasticity, and can adapt to the thermal expansion and vibration during engine operation.

[0043] In one specific embodiment, the thin-walled nut 2 has a thickness of 2-3 mm, and the surface in contact with the wedge-shaped locking washer 3 is provided with anti-slip texture to further enhance the anti-loosening effect. The thin-walled design can reduce the mass of the nut, reduce the impact of vibration inertia, and facilitate installation in confined spaces.

[0044] After the device is installed, the gap between the fuel rack position sensor 1 and the sensor mounting bracket 4 can be precisely controlled by adjusting the tightness of the thin-walled nut 2, thus meeting the requirements of the fuel control system for position detection accuracy.

[0045] In this invention, when a diesel engine is running, the fuel rack position sensor is firmly secured to ensure that its position does not shift, thus providing accurate and timely feedback on the current position of the fuel rack. This enables the control system to output fuel injection commands that meet the engine's power performance under different load conditions, thereby achieving the engine's optimal operating state, best emission indicators, and economic indicators under different operating conditions.

[0046] This utility model's method for preventing loosening of the diesel engine fuel rack position sensor has a simple structure, superior performance, high reliability, strong adaptability, and convenient assembly. It can meet the requirements for preventing loosening of position feedback sensors with different diameter specifications, solving the problem of sensor loosening. It can achieve stable and reliable sampling data from the diesel engine fuel rack position sensor and can operate stably under any working condition without loosening, playing an important role in improving engine energy efficiency and reducing emissions.

[0047] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A diesel engine fuel rack position sensor anti-backout fastening device characterized by: include: Fuel rack position sensor (1) is used to detect the position of the engine fuel rack; A sensor mounting bracket (4) is used to fix the fuel rack position sensor (1), which is inserted into the mounting hole of the sensor mounting bracket (4). A pair of wedge-shaped locking washers (3) are respectively fitted on both sides of the fuel rack position sensor (1); A pair of thin-walled nuts (2) respectively cooperate with the wedge-shaped locking washers (3) and are screwed into the threads on both sides of the outer surface of the fuel rack position sensor (1) to fasten the fuel rack position sensor (1) onto the sensor mounting bracket (4); The wedge-shaped locking washer (3) has its wedge-shaped teeth in a vertically tightened state to prevent the thin-walled nut (2) from loosening under engine vibration.

2. The diesel engine fuel rack position sensor lockout device of claim 1, wherein: Each of the wedge-shaped locking washers (3) includes: washer I (3-1) and washer II (3-2), washer I (3-1) and washer II (3-2) are coaxially close to each other, the surfaces of the two washers that are in contact are provided with interlocking inner wedge teeth (3-3), and the surfaces of the two washers that are far apart are provided with outer wedge teeth (3-4).

3. The diesel engine fuel rack position sensor lockout device of claim 2, wherein: The inclination angle of the inner wedge-shaped tooth (3-3) is 5°-15°; the tooth tip width of the inner wedge-shaped tooth (3-3) is 0.5-0.9mm; The inclination angle of the outer wedge-shaped teeth (3-4) is 5°-15°; the tooth tip width of the outer wedge-shaped teeth (3-4) is 0.1-0.3mm; The outer diameter of the wedge-shaped locking washer (3) matches the outer diameter of the thin-walled nut (2).

4. A diesel engine fuel rack position sensor anti-unscrewing fastening device according to claim 2 or 3, characterised in that: The wedge-shaped locking washer (3) is made of stainless steel.

5. The diesel engine fuel rack position sensor lockout device of claim 1, wherein: The thickness of the thin-walled nut (2) is 2-3 mm, and the surface that contacts the wedge-shaped locking washer (3) is provided with anti-slip texture.

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