Capacitive engine oil pressure sensor and engine lubrication system

Abstract

The utility model relates to a capacitive engine oil pressure sensor and an engine lubrication system, the capacitive engine oil pressure sensor comprises a shell and a base, the shell comprises a cylindrical connecting part, a plurality of bulges are arranged on the circumferential surface of the connecting part, a step surface is formed between the connecting part and a main body part, and a plurality of grooves are formed in the step surface; a circular groove is formed in one end of the base, and an avoiding groove is formed in the bottom face of the circular groove. The protrusions arranged on the pressure sensor can increase the friction force when the shell and the base are connected, it is guaranteed that the shell and the base cannot be disengaged or deviate, and therefore the production efficiency is improved, and the position precision after riveting is guaranteed; the groove can play a role in limiting after riveting, so that relative rotation of the shell and the base is avoided; an avoiding groove is formed in the circular groove, so that the edge position of the ceramic sensor can be prevented from being stressed, and the ceramic sensor is prevented from being damaged in the rivet pressing process; and meanwhile, an original metal sealing gasket is replaced by the fluorosilicone sealing ring, so that the use cost is reduced while the sealing performance is ensured.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a capacitive oil pressure sensor and an engine lubrication system. Background Technology

[0002] The oil pressure sensor in a car is a key electronic component of the car engine. It is used to measure the oil pressure of the engine and convert the oil pressure signal into an electrical signal, which is then transmitted to the engine control unit to control the normal operation of the engine lubrication system.

[0003] Existing oil pressure sensors consist of a housing, a base, and a ceramic sensor. The housing and base are connected together by press-fitting, and the ceramic sensor is pressed between them. However, during the pre-installation process before press-fitting, the housing and base are prone to positional misalignment or even separation, affecting the accuracy and efficiency of the press-fitting. Furthermore, after press-fitting, the housing and base are prone to relative rotation, which can easily damage the ceramic sensor. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem that in the prior art, the housing and base of the oil pressure sensor are prone to mutual positional displacement or even separation during the pre-installation process before riveting, which affects the accuracy and efficiency of riveting, and the housing and base are prone to relative rotation after riveting, which can easily damage the ceramic sensor.

[0005] To solve the above-mentioned technical problems, this utility model provides a capacitive oil pressure sensor, comprising:

[0006] The housing includes a main body, a connecting part coaxially disposed at one end of the main body, the connecting part being cylindrical, a plurality of protrusions evenly spaced around its circumference are disposed on the circumferential surface of the connecting part, and a stepped surface is formed between the connecting part and the main body, a plurality of grooves being symmetrically formed on the stepped surface.

[0007] The base has a circular groove at one end, the inner diameter of which matches the outer diameter of the connecting part, and an annular clearance groove is coaxially provided on the bottom surface of the circular groove.

[0008] In one embodiment of the present invention, an annular limiting groove is further provided on the bottom surface of the circular groove, and a sealing ring matching its shape is provided in the limiting groove.

[0009] In one embodiment of this utility model, the sealing ring is a fluorosilicone sealing ring.

[0010] In one embodiment of the present invention, the base includes a base, one end of which is coaxially provided with a cylindrical riveting part, and the other end of the riveting part away from the base is coaxially provided with the circular groove.

[0011] In one embodiment of the present invention, the side wall of the clearance groove is flush with the inner wall of the riveting part.

[0012] In one embodiment of this utility model, the groove is a trapezoidal groove.

[0013] In one embodiment of this utility model, the side of the protrusion is a slope.

[0014] In one embodiment of the present invention, a receiving groove is coaxially formed at the end of the connecting portion away from the main body portion.

[0015] In one embodiment of this utility model, the main body and the connecting part are integrally formed.

[0016] An engine lubrication system includes a capacitive oil pressure sensor as described in any of the preceding claims.

[0017] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0018] This utility model discloses a capacitive oil pressure sensor and an engine lubrication system, comprising a housing and a base. The housing includes a connecting part, which is cylindrical. Multiple protrusions are evenly spaced around the circumference of the connecting part, forming a stepped surface between the connecting part and the main body. Multiple grooves are symmetrically formed on the stepped surface. One end of the base has a circular groove, and the bottom surface of the groove has an annular clearance groove. The protrusions in this pressure sensor increase the friction between the housing and the base during pre-connection, ensuring they do not detach or shift position, thereby improving production efficiency and ensuring positional accuracy after riveting. The grooves act as a limit after riveting, preventing relative rotation between the housing and the base. Simultaneously, the clearance groove in the circular groove prevents stress on the edges of the ceramic sensor, thus avoiding damage to the ceramic sensor during the riveting process. Attached Figure Description

[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a perspective view of a preferred embodiment of the capacitive oil pressure sensor of this utility model;

[0021] Figure 2This is a schematic diagram of the housing of the capacitive oil pressure sensor according to a preferred embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the base of the capacitive oil pressure sensor according to a preferred embodiment of the present invention.

[0023] Explanation of reference numerals in the accompanying drawings: 1. Housing; 11. Main body; 12. Connecting part; 13. Protrusion; 14. Groove; 2. Base; 21. Circular groove; 22. Clearance groove; 23. Limiting groove; 3. Sealing ring. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention. Example 1

[0025] Reference Figure 1 , Figure 2 and Figure 3 As shown, this utility model discloses a capacitive oil pressure sensor, comprising:

[0026] The housing 1 includes a main body 11. A connecting part 12 is coaxially provided at one end of the main body 11. The connecting part 12 is cylindrical. Multiple protrusions 13 are provided on the circumferential surface of the connecting part 12 and are evenly spaced around it. A stepped surface is formed between the connecting part 12 and the main body 11. Multiple grooves 14 are symmetrically provided on the stepped surface.

[0027] The base 2 has a circular groove 21 at one end. The inner diameter of the circular groove 21 matches the outer diameter of the connecting part 12, and an annular clearance groove 22 is coaxially provided on the bottom surface of the circular groove 21.

[0028] Specifically, the existing capacitive oil pressure sensor has the following structural problems:

[0029] (1) When the housing 1 and the base 2 are pre-connected, one end of the connecting part 12 of the housing 1 is inserted into the circular groove 21. Before riveting, the housing 1 and the base 2, which are pre-connected, maintain their relative positions through the friction between their sides. However, the friction between the housing 1 and the base 2 in the original structure is small, and they are prone to positional shifts. It is impossible to guarantee the positional accuracy after riveting, and there may also be a situation where they separate from each other. It is necessary to reconnect the housing and the base, which affects the riveting efficiency and increases the production cost.

[0030] (2) After the housing 1 and the base 2 are riveted, relative rotation between them is likely to occur, which may damage the ceramic sensor between the housing 1 and the base 2.

[0031] (3) During the riveting process of housing 1 and base 2, the edge of the ceramic sensor between them is easily damaged.

[0032] This utility model discloses a capacitive oil pressure sensor. Multiple evenly arranged protrusions 13 are provided on the circumferential surface of the connecting portion 12 of the housing 1. These protrusions increase the friction between the housing 1 and the base 2 during pre-connection, ensuring that the housing 1 and base 2 do not detach and are less prone to positional misalignment. This improves production efficiency and ensures positional accuracy after riveting. It also prevents damage to the ceramic sensor located between the housing 1 and base 2 due to positional deviation during riveting. Furthermore, multiple grooves 14 are provided on the connecting portion 12. After riveting, the grooves 14 act as limiters, preventing relative rotation between the housing 1 and base 2. Simultaneously, a clearance groove 22 corresponding to the edge position of the ceramic sensor is provided in the circular groove 21 of the base 2, preventing stress on the edges of the ceramic sensor and ensuring that the ceramic sensor is not damaged during riveting.

[0033] Furthermore, an annular limiting groove 23 is formed on the bottom surface of the circular groove 21, and a sealing ring 3 matching its shape is disposed in the limiting groove 23. Specifically, the original pressure sensor used a metal sealing gasket for sealing, which was costly; the improved version uses a fluorosilicone sealing ring, reducing the cost. Specifically, the limiting groove 23 ensures that the position of the sealing ring does not shift, thereby ensuring the sealing effect.

[0034] Furthermore, the sealing ring 3 is a fluorosilicone sealing ring.

[0035] Furthermore, the base 2 includes a base, one end of which is coaxially provided with a cylindrical riveting part, and the other end of the riveting part away from the base is coaxially provided with a circular groove 21. Specifically, the circular groove 21 on the riveting part forms an annular thin-walled structure, and the free end of the thin-walled structure is folded and pressed onto the connecting part 12 of the housing 1 by a riveting device to achieve the connection between the housing 1 and the base 2.

[0036] Furthermore, the sidewall of the clearance groove 22 is flush with the inner wall of the riveting part, thereby avoiding the edge position of the ceramic sensor.

[0037] Furthermore, the groove 14 is a trapezoidal groove, but is not limited to a trapezoidal shape.

[0038] Furthermore, the side of the protrusion 13 is a slope, which can play a certain guiding role during the installation of the housing 1 to the base 2, making it easier for the staff to operate.

[0039] Furthermore, a receiving groove is coaxially provided at one end of the connecting part 12 away from the main body part 11, the receiving groove being used to accommodate and restrict the ceramic sensor.

[0040] Furthermore, the main body 11 and the connecting part 12 are integrally formed structures. Example 2

[0041] This utility model also discloses an engine lubrication system, including a capacitive oil pressure sensor as described in Embodiment 1. This capacitive oil pressure sensor can be applied to various engine lubrication systems and automotive structures.

[0042] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A capacitive oil pressure sensor, characterized in that, include: The housing includes a main body, a connecting part coaxially disposed at one end of the main body, the connecting part being cylindrical, a plurality of protrusions evenly spaced around its circumference are disposed on the circumferential surface of the connecting part, and a stepped surface is formed between the connecting part and the main body, a plurality of grooves being symmetrically formed on the stepped surface. The base has a circular groove at one end, the inner diameter of which matches the outer diameter of the connecting part, and an annular clearance groove is coaxially provided on the bottom surface of the circular groove.

2. The capacitive oil pressure sensor according to claim 1, characterized in that: An annular limiting groove is also provided on the bottom surface of the circular groove, and a sealing ring matching its shape is provided in the limiting groove.

3. The capacitive oil pressure sensor according to claim 2, characterized in that: The sealing ring is a fluorosilicone sealing ring.

4. The capacitive oil pressure sensor according to claim 1, characterized in that: The base includes a base, one end of which is coaxially provided with a cylindrical riveting part, and the other end of the riveting part away from the base is coaxially provided with the circular groove.

5. The capacitive oil pressure sensor according to claim 4, characterized in that: The clearance groove is located on the outer side wall, which is flush with the inner wall of the riveting part.

6. The capacitive oil pressure sensor according to claim 1, characterized in that: The groove is a trapezoidal groove.

7. The capacitive oil pressure sensor according to claim 1, characterized in that: The side of the protrusion is a slope.

8. The capacitive oil pressure sensor according to claim 1, characterized in that: The end of the connecting part away from the main body is coaxially provided with a receiving groove.

9. The capacitive oil pressure sensor according to claim 1, characterized in that: The main body and the connecting part are integrally formed.

10. An engine lubrication system, characterized in that: Including the capacitive oil pressure sensor as described in any one of claims 1-9.

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