Automobile temperature sensor nut

Abstract

The utility model relates to the technical field of sensors, in particular to an automobile temperature sensor nut which comprises a sensor body and a nut body. A sleeve which is coaxially arranged is integrally formed at the bottom end of the nut body, and the sleeve is divided into a smooth section and a threaded section from top to bottom; and an external thread is arranged on the outer surface of the threaded section and is used for realizing threaded connection with a threaded hole of an engine cylinder body. The sensor is connected with the nut through threads on the inner wall of the sleeve, and the nut is connected with an engine cylinder body through a sleeve thread section. According to the design, stress caused by vibration is dispersed, looseness is effectively avoided, meanwhile, when the sensor is installed and replaced, the risk of damage to cylinder threads is reduced, the sleeve serves as a middle transition piece, the machining tolerance of the sensor and a cylinder installation hole is allowed to be within a certain range, the assembly difficulty is reduced, the sleeve bears main installation torque, and the installation efficiency is improved. The sensor only bears self threaded connection torque, so that the sensor pin is prevented from being broken due to overload.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a nut for an automotive temperature sensor. Background Technology

[0002] In automotive engine temperature monitoring systems, reliable installation of the temperature sensor is crucial. Traditional installation methods typically involve directly connecting the sensor to a threaded hole in the engine block. This method has the following significant drawbacks:

[0003] The high-frequency vibrations generated during engine operation are directly transmitted to the threaded connection between the sensor and the cylinder block, causing stress concentration at the sensor pins or cylinder block threads. Long-term use can easily lead to loose threads or sensor breakage. When installing or replacing the sensor, applying torque directly to the cylinder block threads can easily cause thread wear or even stripping, especially with lightweight cylinder block materials such as aluminum alloys, which have lower thread strength and a higher risk of damage. The machining tolerances of the sensor and cylinder block mounting holes directly affect the assembly accuracy. Traditional structures have strict tolerance matching requirements, and exceeding the tolerance range can lead to installation difficulties or sealing failure, increasing manufacturing and assembly costs. In traditional installation methods, the sensor must withstand the dual effects of installation torque and vibration loads. Due to structural strength limitations, the pins are prone to overload breakage, affecting the sensor's service life. Utility Model Content

[0004] The purpose of this invention is to provide an automotive temperature sensor nut that solves the problems of stress concentration, assembly damage, and tolerance compatibility in traditional sensor installation methods.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A car temperature sensor nut includes a sensor body and a nut body. The bottom end of the nut body has a coaxially arranged sleeve, which is divided into a smooth section and a threaded section from top to bottom. The outer surface of the threaded section has external threads for threaded connection with a threaded hole in the engine block. The inner wall of the smooth section is smooth and communicates with the inner wall of the threaded section, forming a through-type mounting channel for mounting the sensor body. The surface of the nut body has a circular hole that communicates with the sleeve, the axis of which intersects perpendicularly with the axis of the sleeve. The inner wall of the sleeve has internal threads for threaded connection with the external threaded section of the sensor body.

[0007] Preferably, the outer surface of the smooth section is radially distributed with heat dissipation fins, each heat dissipation fin is welded and fixed to the outer circular surface of the smooth section, and the extension direction of the heat dissipation fins is parallel to the axis of the sleeve, forming a radial heat dissipation structure.

[0008] Preferably, at the junction of the smooth section and the threaded section of the sleeve, an annular retaining ring is integrally formed. The outer diameter of the retaining ring is larger than the outer diameter of the sleeve, forming a boss structure for positioning and installation.

[0009] Preferably, the bottom of the fixing ring has an annular groove, and a silicone pad is installed in the annular groove with an interference fit. The bottom surface of the silicone pad contacts the mounting surface of the engine cylinder block to form a sealed and leak-proof structure.

[0010] Preferably, the nut body has an annular receiving chamber at the top, which extends downward into the smooth section of the sleeve, and the bottom end of the receiving chamber is flush with the bottom end of the heat dissipation fins, forming a heat dissipation cavity that cooperates with the heat dissipation fins.

[0011] Preferably, the receiving chamber is filled with a thermally conductive material, which is graphene thermally conductive silicone or alumina ceramic particles, used to transfer the heat generated by the sensor body to the heat dissipation fins.

[0012] Preferably, the inner wall of the circular hole of the nut body is provided with a rubber ring, which is embedded in the inner wall of the circular hole by an interference fit to seal the assembly gap between the sensor body and the circular hole.

[0013] This utility model has at least the following beneficial effects:

[0014] The sensor is connected to the nut via the thread on the inner wall of the sleeve, and the nut is then connected to the engine block via the threaded section of the sleeve. This design disperses the stress caused by vibration, effectively preventing loosening. At the same time, it reduces the risk of damage to the cylinder block threads during sensor installation and replacement. The sleeve, as an intermediate transition component, allows for machining tolerances between the sensor and the cylinder block mounting holes within a certain range, reducing assembly difficulty. The sleeve bears the main installation torque, while the sensor only bears the torque of its own threaded connection, preventing the sensor pins from breaking due to overload.

[0015] The radially welded heat dissipation fins on the smooth surface greatly increase the heat dissipation area and accelerate heat dissipation. Combined with the thermally conductive material within the housing, this rapidly transfers heat from the sensor to the heat dissipation fins, ensuring the sensor accurately detects the engine temperature and improving the timeliness and accuracy of temperature monitoring.

[0016] The rubber ring at the bottom of the annular convex rib and the silicone pad in the annular groove at the bottom of the fixing ring respectively seal the connection between the sensor and the nut and the nut and the cylinder body, effectively preventing the intrusion of water vapor, dust and other impurities, preventing the sensor from being damaged by corrosion and extending its service life. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This utility model Figure 1 Side sectional view;

[0020] Figure 3 This is a cross-sectional view of the sleeve of this utility model.

[0021] In the diagram: 1. Sensor body; 2. Nut body; 3. Rubber ring; 4. Heat dissipation fins; 5. Retaining ring; 6. Silicone pad; 7. Smooth section; 8. Thermally conductive material; 9. Receiving chamber; 10. Threaded section; 11. Sleeve. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] Reference Figure 1-3A type of automotive temperature sensor nut includes a sensor body 1 and a nut body 2. The bottom end of the nut body 2 is integrally formed with a coaxially arranged sleeve 11, which is divided into a smooth section 7 and a threaded section 10 from top to bottom. The outer surface of the threaded section 10 has external threads for threaded connection with a threaded hole in the engine block. The external threads of the threaded section 10 engage with the threaded hole in the engine block to mechanically fix the nut body 2. The inner wall of the smooth section 7 is smooth and communicates with the inner wall of the threaded section 10, forming a through-type mounting channel for installing the sensor body 1. The surface of the nut body 2 has a circular hole that communicates with the sleeve 11, the axis of which is perpendicular to the axis of the sleeve 11. The inner wall of the sleeve 11 has internal threads for threaded connection with the external threaded section 10 of the sensor body 1. The sensor body 1 is screwed into the mounting channel through the internal threads of the sleeve 11. The circular hole is used for the lead-out of the sensor body 1's wiring harness. The smooth section 7 and the threaded section 10 are coaxially arranged to ensure that the axis of the sensor body 1 is aligned with the engine temperature acquisition point. The external thread forms a clearance fit with the M12×1.5 threaded hole of the cylinder body, with the same pitch, to achieve mechanical fixation of the nut body 2. The inner wall roughness of the smooth section 7 is Ra≤1.6μm, which is connected with the inner wall of the threaded section 10 to form a through installation channel with a diameter of Φ14mm, for the sensor body 1 to be screwed in for installation.

[0025] The threaded connection supports quick assembly and disassembly. The through-channel enables direct contact temperature measurement between the sensor body 1 and the engine. The nut body 2 and sleeve 11 are integrally formed, reducing the number of assembly parts and improving structural reliability. The coaxial design ensures the stability of the contact position between the temperature measuring end of the sensor body 1 and the engine cylinder block.

[0026] Furthermore, the outer surface of the smooth segment 7 is radially distributed with heat dissipation fins 4. Each heat dissipation fin 4 is welded and fixed to the outer circular surface of the smooth segment 7, and the extension direction of the heat dissipation fins 4 is parallel to the axis of the sleeve 11, forming a radial heat dissipation structure. The heat generated by the operation of the sensor body 1 is transferred to the smooth segment 7 through the inner wall of the sleeve 11, and then radiated to the surrounding air through the heat dissipation fins 4. The radial fins increase the heat dissipation area and accelerate the heat exchange efficiency. The radial heat dissipation fins 4 are 1.5mm thick, 20mm high, and 8mm in radial spacing. They are fixed to the outer circular surface of the smooth segment 7 using TIG welding technology. The fins are made of 6061-T6 aluminum alloy with anodized surface treatment and an oxide film thickness of 15μm, which takes into account both heat dissipation and corrosion resistance.

[0027] Furthermore, at the junction of the smooth section 7 and the threaded section 10 of the sleeve 11, an annular fixing ring 5 is integrally formed. The outer diameter of the fixing ring 5 is larger than the outer diameter of the sleeve 11, forming a boss structure for positioning and installation. During installation, it contacts the mounting surface of the engine cylinder block, limits the screwing depth of the nut body 2, and ensures the contact distance between the temperature measuring end of the sensor body 1 and the cylinder block.

[0028] The boss structure enables visual positioning of the nut installation depth, avoiding over-tightening or under-tightening. The contact area between the retaining ring 5 and the cylinder mounting surface is greater than that of the threaded section 10, enhancing the resistance to vibration and loosening.

[0029] Furthermore, an annular groove is provided at the bottom of the retaining ring 5, and a silicone pad 6 is installed in the annular groove with an interference fit. The bottom surface of the silicone pad 6 contacts the mounting surface of the engine cylinder block to form a sealed and leak-proof structure. The elastic deformation of the silicone pad 6 fills the micro gap between the retaining ring 5 and the cylinder block, preventing liquids such as engine oil and coolant from seeping in. When the engine vibrates, the silicone pad 6 absorbs mechanical stress and reduces the rigid impact between the retaining ring 5 and the cylinder block.

[0030] Furthermore, the nut body 2 has an annular receiving chamber 9 at the top, which extends downward into the smooth section 7 of the sleeve 11, and the bottom end of the receiving chamber 9 is flush with the bottom end of the heat dissipation fin 4, forming a heat dissipation cavity that cooperates with the heat dissipation fin 4.

[0031] Furthermore, the receiving chamber 9 is filled with a thermally conductive material 8, forming a thermal bridge between the sensor body 1 and the heat dissipation fins 4. The thermally conductive material 8 is graphene thermally conductive silicone or alumina ceramic particles, used to transfer the heat generated by the sensor body 1 to the heat dissipation fins 4. The high thermal conductivity of graphene silicone or the solid-phase thermal conductivity of alumina particles quickly dissipates the heat from the top of the sensor body 1. The plasticity of the material fills the tiny gaps, eliminates the air insulation layer, and reduces the contact thermal resistance. The annular receiving chamber is 30mm deep and has an inner diameter of Φ20mm. Its bottom end is flush with the bottom end of the heat dissipation fins 4, forming a semi-closed heat dissipation cavity.

[0032] Furthermore, a rubber ring 3 is provided on the inner wall of the circular hole of the nut body 2. The rubber ring 3 is embedded in the inner wall of the circular hole by an interference fit to seal the assembly gap between the sensor body 1 and the circular hole. The elastic deformation of the rubber ring 3 fills the assembly gap between the sensor body 1 and the circular hole, preventing dust and moisture from entering. When the engine vibrates, the rubber ring 3 absorbs radial displacement, protecting the wiring harness interface of the sensor body 1 from being pulled, preventing liquid from seeping into the engine along the wiring harness of the sensor body 1, and avoiding the risk of short circuit.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A nut for an automotive temperature sensor, characterized in that, Includes sensor body (1) and nut body (2); The bottom end of the nut body (2) is integrally formed with a sleeve (11) arranged coaxially. The sleeve (11) is divided into a smooth section (7) and a threaded section (10) from top to bottom. The outer surface of the threaded section (10) is provided with external threads for threaded connection with the threaded hole of the engine cylinder block; The inner wall of the smooth section (7) is smooth and communicates with the inner wall of the threaded section (10), forming a through-type installation channel for the sensor body (1) to be installed. The surface of the nut body (2) is provided with a circular hole that passes through the sleeve (11), and the axis of the circular hole intersects perpendicularly with the axis of the sleeve (11); The inner wall of the sleeve (11) is provided with an internal thread for threaded connection with the external thread section (10) of the sensor body (1).

2. The automotive temperature sensor nut according to claim 1, characterized in that, The outer surface of the smooth section (7) is radially distributed with heat dissipation fins (4). Each heat dissipation fin (4) is welded and fixed to the outer circular surface of the smooth section (7), and the extension direction of the heat dissipation fins (4) is parallel to the axis of the sleeve (11) to form a radial heat dissipation structure.

3. The automotive temperature sensor nut according to claim 1, characterized in that, At the junction of the smooth section (7) and the threaded section (10) of the sleeve (11), an annular fixing ring (5) is integrally formed. The outer diameter of the fixing ring (5) is larger than the outer diameter of the sleeve (11), forming a boss structure for positioning and installation.

4. The automotive temperature sensor nut according to claim 3, characterized in that, The bottom of the fixing ring (5) is provided with an annular groove, and a silicone pad (6) is installed in the annular groove with an interference fit. The bottom surface of the silicone pad (6) is in contact with the mounting surface of the engine cylinder block to form a sealed and leak-proof structure.

5. The automotive temperature sensor nut according to claim 1, characterized in that, The nut body (2) has an annular receiving chamber (9) at the top. The receiving chamber (9) extends downward into the smooth section (7) of the sleeve (11), and the bottom end of the receiving chamber (9) is flush with the bottom end of the heat dissipation fin (4), forming a heat dissipation cavity that cooperates with the heat dissipation fin (4).

6. The automotive temperature sensor nut according to claim 5, characterized in that, The containment chamber (9) is filled with a thermally conductive material (8), which is graphene thermally conductive silicone or alumina ceramic particles, used to transfer the heat generated by the sensor body (1) to the heat dissipation fins (4).

7. The automotive temperature sensor nut according to claim 1, characterized in that, The inner wall of the circular hole of the nut body (2) is provided with a rubber ring (3), which is embedded in the inner wall of the circular hole by an interference fit to seal the assembly gap between the sensor body (1) and the circular hole.

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