Oil pressure sensor

Abstract

This disclosure provides an oil pressure sensor, belonging to the field of automotive parts technology. The oil pressure sensor includes a pipe joint, a pressure-sensing element, and a filter. The pipe joint has a connected oil chamber and an oil passage. The filter is connected to the pipe joint and located within the oil chamber. The pipe joint is connected to the main oil passage. Before the oil enters the oil passage, the filter removes impurities from the oil, preventing impurities from entering the oil passage within the pipe joint. This makes the oil pressure sensor less prone to clogging, thus enabling accurate measurement of oil pressure.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of automobile accessories, and in particular to an oil pressure sensor. BACKGROUND

[0002] The oil pressure sensor is installed on the main oil passage of the engine lubrication system to detect the oil pressure of the engine. When the oil pressure is detected to be too high, the oil pressure signal is output to the ECU (Electronic Control Unit) in the form of voltage, and then the ECU controls the oil lamp on the oil pressure gauge to light up to remind the vehicle owner to take appropriate measures, such as replacing the oil or replacing the oil filter. When the oil pressure is detected to be too low, the oil pressure signal is output to the ECU in the form of voltage, and then the ECU controls the oil lamp on the oil pressure gauge to light up, and the ECU controls the variable oil pump to control the oil supply amount of the oil pump, so that the engine lubrication is in the best working condition. If there is no oil pressure sensor, when problems such as lack of oil occur, it will cause irreversible damage to the engine, so the oil pressure sensor plays a crucial role in the engine.

[0003] The oil pressure sensor in the related art includes a pipe joint and a pressure sensing element. One end of the pipe joint is connected with the main oil passage, and the other end is connected with the pressure sensing element. The oil in the main oil passage flows into the oil passage of the pipe joint, and the oil pressure is measured by the pressure sensing element.

[0004] However, when there are many impurities in the oil, the impurities are easy to block the oil passage in the pipe joint, so that the oil pressure sensor cannot measure the oil pressure. SUMMARY

[0005] The present disclosure provides an oil pressure sensor, which can solve the technical problems existing in the related art. The technical scheme of the oil pressure sensor is as follows:

[0006] The present disclosure provides an oil pressure sensor, which includes a pipe joint, a pressure sensing element, and a filter screen.

[0007] The pipe joint has a communicating oil cavity and an oil passage inside. The oil cavity is used to communicate with the main oil passage, and the diameter of the oil cavity is greater than the diameter of the oil passage.

[0008] The pressure sensing element is connected with the pipe joint and communicates with one end of the oil passage away from the oil cavity.

[0009] The filter screen is connected with the pipe joint and located in the oil cavity.

[0010] In a possible implementation, the ratio of the diameter of the oil passage to the wall thickness of the pipe joint corresponding to the oil passage is 1:3-1:1.5.

[0011] In a possible implementation, the pipe joint corresponds to a wall thickness of the oil channel in a range of 6-10 mm, and a diameter of the oil channel in a range of 5-8 mm.

[0012] In a possible implementation, the pipe joint corresponds to a ratio of a wall thickness of the oil cavity to a diameter of the oil cavity in a range of 1:6-1:5.

[0013] In a possible implementation, the pipe joint corresponds to a wall thickness of the oil cavity in a range of 3-4 mm, and a diameter of the oil cavity in a range of 15-20 mm.

[0014] In a possible implementation, a length of the oil cavity is less than a length of the oil channel.

[0015] In a possible implementation, a ratio of the length of the oil cavity to the length of the oil channel is in a range of 1:5-1:3.

[0016] In a possible implementation, a spacing is provided between the filter screen and the oil channel.

[0017] In a possible implementation, a side wall of the pipe joint has a plug hole for plugging and unplugging the filter screen.

[0018] An inner wall of the oil cavity has a mounting groove flush with the plug hole, and the filter screen is plugged in the plug hole and the mounting groove.

[0019] In a possible implementation, the plug hole corresponds to a circumferential angle of 180°.

[0020] In a possible implementation, the side wall of the pipe joint further has an opening.

[0021] The opening penetrates an end of the pipe joint and communicates with the plug hole.

[0022] In a possible implementation, the filter screen includes an edge portion and an intermediate portion.

[0023] The edge portion has a thickness greater than that of the intermediate portion, and the intermediate portion has a plurality of filter holes.

[0024] In a possible implementation, the number of filter holes is in a range of 15-20.

[0025] In a possible implementation, a flow area of a single filter hole is less than a flow area of the oil channel, and a total flow area of the plurality of filter holes is greater than the flow area of the oil channel.

[0026] In a possible implementation, the outer wall of the pipe joint has a threaded structure corresponding to the part of the oil passage.

[0027] In a possible implementation, the oil pressure sensor further comprises a shell, and the shell is provided with a circuit connector;

[0028] One end of the circuit connector is electrically connected to the pressure sensing element, and the other end is electrically connected to an ECU (Electronic Control Unit) on the vehicle.

[0029] The technical solutions provided by the disclosure have at least the following beneficial effects:

[0030] The oil pressure sensor provided by the disclosure comprises a pipe joint, a pressure sensing element and a filter screen, the pipe joint has a communicating oil cavity and an oil passage inside, the filter screen is connected to the pipe joint and located in the oil cavity. The pipe joint is in communication with the main oil passage of the engine lubrication system. Before the oil enters the oil passage, the filter screen can filter out impurities in the oil, so that impurities in the oil cannot enter the oil passage in the pipe joint, so that the oil pressure sensor is not easy to be blocked, and the oil pressure can be accurately measured.

[0031] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings incorporated in the specification and forming a part of it, illustrate embodiments consistent with the present disclosure and serve to explain the principles of the present disclosure. In the drawings:

[0033] Figure 1 is a structural schematic diagram of an oil pressure sensor according to an embodiment of the disclosure;

[0034] Figure 2 is a structural schematic diagram of a pipe joint according to an embodiment of the disclosure;

[0035] Figure 3 is a structural schematic diagram of a pipe joint according to an embodiment of the disclosure;

[0036] Figure 4 is a structural schematic diagram of an oil pressure sensor according to an embodiment of the disclosure;

[0037] Figure 5 is a structural schematic diagram of a filter screen according to an embodiment of the disclosure;

[0038] Figure 6 is a structural schematic diagram of an oil pressure sensor according to an embodiment of the disclosure;

[0039] Figure 7 is a structural schematic diagram of a pipe joint shown by an embodiment of the present disclosure.

[0040] Legend:

[0041] 1, pipe joint, 11, oil cavity, 111, insertion hole, 112, installation groove, 113, opening, 12, oil channel, 121, stepped surface;

[0042] 2, pressure sensing element;

[0043] 3, filter screen, 31, edge part, 32, middle part, 321, filter hole;

[0044] 4, shell, 41, terminal;

[0045] D1, diameter of the oil cavity;

[0046] D2, diameter of the oil channel;

[0047] D3, minor diameter of the pipe joint corresponding to the oil channel;

[0048] D4, diameter of the pipe joint corresponding to the oil cavity;

[0049] S1, wall thickness of the pipe joint corresponding to the oil cavity;

[0050] S2, wall thickness of the pipe joint corresponding to the oil channel;

[0051] L1, length of the oil cavity;

[0052] L2, length of the oil channel;

[0053] R1, radius of the pipe joint corresponding to the oil cavity.

[0054] Through the above drawings, the specific embodiments of the present disclosure have been shown, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present disclosure by any means, but to illustrate the concept of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the drawings.

[0056] The terms used in the embodiments of the present disclosure are used to describe only the embodiments of the present disclosure and are not intended to limit the present disclosure. Unless otherwise defined, technical terms or scientific terms used herein have the same meaning as would be understood by those skilled in the art to which the present disclosure belongs. The terms "first", "second", "third", and the like used in the description of the present disclosure and the claims of the present patent application do not denote any sequence, quantity, or importance, but are used to distinguish different components. Similarly, the terms "one" or "a" or the like do not denote a quantity restriction, but denote the presence of at least one. The terms "include" or "comprise" or the like mean that the elements or objects before the "include" or "comprise" cover the elements or objects listed after the "include" or "comprise" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" or the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships can also change accordingly.

[0057] The oil pressure sensor is installed on the main oil passage of the engine lubrication system to detect the oil pressure of the engine. When the oil pressure is detected to be too high, the oil pressure signal is output in the form of voltage from the oil pressure sensor to the ECU (Electronic Control Unit), and then the oil light on the oil pressure gauge is controlled to be on to remind the owner to take appropriate measures, such as replacing the oil or replacing the oil filter.

[0058] When the oil pressure is detected to be too low, the oil pressure signal is output in the form of voltage from the oil pressure sensor to the ECU, and then the oil light on the oil pressure gauge is controlled to be on, and at the same time the variable oil pump is controlled by the ECU to control the oil supply amount of the oil pump, so that the engine lubrication is in the best working condition. If there is no oil pressure sensor, when problems such as lack of oil occur, it will cause irreversible damage to the engine, so the oil pressure sensor plays a crucial role in the lubrication system.

[0059] With the increasing demand for engine performance, the engine structure is becoming more and more compact, tending to miniaturization and light weight, which leads to the fact that the most widely used engine oil pressure sensor on the market has gradually shown many limitations. Most engine oil pressure sensors on the market are screwed with threads. In order to ensure the structural strength and miniaturization and light weight of the sensor, the oil inlet hole of the sensor needs to be designed to be small. If the diameter of the oil inlet hole is too large, it may cause the threads to break or fail when screwed. However, a small diameter of the oil inlet hole may cause impurities to block the oil inlet hole, so that the engine oil pressure sensor cannot measure the oil pressure or the signal measurement is inaccurate. If the engine oil filter has not been replaced for a long time or is damaged, a large amount of metal impurities and combustion particle enter the oil inlet of the engine oil pressure sensor, causing the oil inlet to be blocked, and the engine oil pressure sensor to measure inaccurately or be unable to measure.

[0060] At the same time, impurities with large particles may scratch or damage the pressure sensing element or other electronic components, resulting in reduced reliability of the engine oil pressure sensor.

[0061] In view of the above technical problems, the engine oil pressure sensor provided by the embodiments of the present disclosure can filter impurities before measuring the oil pressure. The engine oil pressure sensor provided by the embodiments of the present disclosure is exemplarily described as follows:

[0062] As shown in Figure 1 , the engine oil pressure sensor comprises a pipe joint 1, a pressure sensing element 2 and a filter screen 3. As shown in Figure 2 , the pipe joint 1 has a communicating oil cavity 11 and an oil channel 12 inside. The oil cavity 11 is used to communicate with the main oil channel, and the diameter of the oil cavity 11 is larger than that of the oil channel 12. The pressure sensing element 2 is connected with the pipe joint 1 and communicates with the end of the oil channel 12 away from the oil cavity 11. The filter screen 3 is connected with the pipe joint 1 and located in the oil cavity 11.

[0063] Among them, the pressure sensing element 2 can be an elastic strain sensor, a semiconductor piezoresistive sensor, a ceramic piezoresistive sensor, etc.

[0064] The material of the filter screen 3 can be metal, such as carbon steel, alloy steel, etc., so that the filter screen 3 is not easy to be damaged and can be reused after cleaning.

[0065] The technical scheme provided by the embodiments of the present disclosure can filter the impurities in the oil before the oil enters the oil channel 12 by arranging the filter screen 3 in the oil cavity 11 of the pipe joint 1, so that the impurities in the oil can be prevented from entering the oil channel 12 in the pipe joint 1, the engine oil pressure sensor is not easy to be blocked, and the oil pressure can be accurately measured.

[0066] In some examples, the outer wall of the pipe joint 1 corresponding to the part of the oil channel 12 has a threaded structure, facilitating the connection and disconnection of the pipe joint 1 with the main oil channel, while ensuring the sealing of the main oil channel and the pipe joint 1, avoiding oil leakage.

[0067] In some examples, as shown in Figure 3 the ratio of the diameter D2 of the oil channel to the wall thickness S2 of the part of the oil channel 12 of the pipe joint 1 can be 1:3-1:1.5. Because the pipe joint 1 is connected with the main oil channel by threads, if the wall thickness S2 of the part of the oil channel of the pipe joint is too thin, the connection strength with the main oil channel will be reduced, causing the part of the oil channel 12 of the pipe joint 1 to deform when connected with the main oil channel.

[0068] For example, the wall thickness S2 of the part of the oil channel 12 of the pipe joint 1 can be 9 mm. The diameter D2 of the oil channel can be 5-8 mm. For example, the diameter D2 of the oil channel can be 6 mm.

[0069] In some examples, the ratio of the wall thickness S1 of the oil cavity 11 of the pipe joint 1 to the diameter D1 of the oil cavity 11 can be 1:6-1:5.

[0070] For example, the wall thickness S1 of the oil cavity 11 of the pipe joint 1 can be 3 mm. The diameter D1 of the oil cavity 11 can be 15-20 mm. For example, the diameter D1 of the oil cavity 11 can be 18 mm.

[0071] In some examples, as shown in Figure 2 and Figure 3 the length L1 of the oil cavity 11 is less than the length L2 of the oil channel 12.

[0072] Because the diameter D1 of the oil cavity 11 is greater than the diameter D2 of the oil channel 12, that is, the wall thickness S1 of the part of the oil cavity 11 of the pipe joint 1 is less than the wall thickness S2 of the part of the oil channel 12 of the pipe joint 1, the length L1 of the oil cavity 11 is less than the length L2 of the oil channel 12, so that the wall thickness of most of the pipe joint 1 is thick, ensuring the overall strength of the pipe joint 1. The wall thickness S1 of the part of the oil cavity 11 of the pipe joint 1 is less than the wall thickness S2 of the part of the oil channel 12 of the pipe joint 1, so as to ensure that the diameter D1 of the oil cavity 11 is greater than the diameter D2 of the oil channel 12, and further make the diameter of the filter screen 3 greater than the diameter D2 of the oil channel 12, so that the oil flow entering the oil channel 12 will not be reduced due to the increase of the filter screen 3.

[0073] In some examples, the ratio of the length L1 of the oil cavity to the length L2 of the oil channel is 1:5-1:3, so that the oil cavity 11 has sufficient space for placing the filter screen 3. Because the flow area of the oil cavity 11 is different from the flow area of the oil channel 12, the pressures of the oil in the oil cavity 11 and the oil channel 12 can be different. If the ratio of the lengths of the oil cavity 11 and the oil channel 12 is too large, the oil channel 12 will be too short, which will affect the pressure of the oil in the oil channel 12 and cause the oil pressure sensor to measure inaccurately.

[0074] For example, the length L1 of the oil cavity 11 can be 8 mm. The length L2 of the oil channel 12 can be 30-35 mm. For example, the length L2 of the oil channel 12 can be 32 mm.

[0075] In some examples, as shown in Figure 2 , the filter screen 3 has a spacing from the oil channel 12, so that all the filter holes 321 on the filter screen 3 can flow the oil. Because the diameter D2 of the oil channel 12 is smaller than the diameter D1 of the oil cavity 11, if there is no spacing between the filter screen 3 and the oil channel 12, the filter holes 321 on the filter screen 3 opposite to the oil channel 12 can flow the oil, and the remaining filter holes 321 will be blocked by the stepped surface 121 formed between the oil cavity 11 and the oil channel 12, which makes it difficult for the oil to flow from the oil cavity 11 to the oil channel 12, thereby reducing the amount of oil flowing into the oil channel 12 and causing the oil pressure sensor to measure the oil pressure inaccurately.

[0076] In some examples, as shown in Figure 2 and Figure 4 , the side wall of the pipe joint 1 has a plug hole 111 for plugging and unplugging the filter screen 3. The inner wall of the oil cavity 11 has a mounting groove 112 flush with the plug hole 111, and the filter screen 3 is plugged into the plug hole 111 and the mounting groove 112.

[0077] The two ends of the plug hole 111 are coplanar with the two ends of the mounting groove 112, that is, the plug hole 111 communicates with the mounting groove 112, so that the filter screen 3 can be placed in the plug hole 111 and the mounting groove 112. The thickness of the plug hole 111 along the axial direction of the pipe joint 1 is the thickness of the filter screen 3, and the plug hole 111 and the filter screen 3 are clearance fit, which facilitates the placement and removal of the filter screen 3 from the pipe joint 1, and at the same time ensures that the filter screen 3 can contact the two sides of the plug hole 111 after being placed in the pipe joint 1, avoiding the shaking of the filter screen 3.

[0078] The inner diameter of the installation groove 112 is greater than the inner diameter of the oil cavity 11, which can be regarded as a groove along the circumferential direction of the inner wall of the oil cavity 11. The thickness of the installation groove 112 is the same as the thickness of the filter screen 3, and the installation groove 112 and the filter screen 3 are in clearance fit, so that the filter screen 3 can be easily placed in or taken out of the installation groove 112, and at the same time, it is ensured that the filter screen 3 can contact the upper and lower sides of the installation groove 112 after being placed in the installation groove 112, thereby avoiding the filter screen 3 from shaking in the installation groove 112.

[0079] In some examples, as shown in Figure 2 and Figure 3 The length of the insertion hole 111 along the circumferential direction is the arc length of a semicircle. The insertion hole 111 can be regarded as a slot hole cut in the part of the oil cavity 11 of the pipe joint 1, and the cutting depth is the radius R1 of the oil cavity 11 of the pipe joint 1. The filter screen 3 can smoothly pass through the insertion hole 111. If the length of the insertion hole 111 along the circumferential direction is less than the arc length of a semicircle, only a part of the filter screen 3 can be inserted into the insertion hole 111, and the remaining part will be stuck outside the insertion hole 111. If the length of the insertion hole 111 along the circumferential direction is too large, the length of the installation groove 112 will be too small, which reduces the contact area between the filter screen 3 and the installation groove 112, and is not conducive to the stable placement of the filter screen 3 in the oil cavity 11.

[0080] In some examples, as shown in Figure 4 The side wall of the pipe joint 1 also has an opening 113, which penetrates the end of the pipe joint 1 and communicates with the insertion hole 111. When it is necessary to take out the filter screen 3 from the pipe joint 1, a tool can be used to pull the edge part 321 of the filter screen 3, and the tool passes through the opening 113 and pulls outward to pull out the filter screen 3 from the insertion hole 111.

[0081] Of course, in other examples, the side wall of the pipe joint 1 can also not have the opening 113. When it is necessary to take out the filter screen 3 from the pipe joint 1, a tool can be used to push out a part of the filter screen 3 from the insertion hole 111 from the end surface of the pipe joint 1, and then the tool is used to pull the edge of the part of the filter screen 3 extending out of the insertion hole 111.

[0082] In some examples, as shown in Figure 5 The filter screen 3 includes an edge part 31 and a middle part 32. The thickness of the edge part 31 is greater than the thickness of the middle part 32, and the middle part 32 has a plurality of filter holes 321.

[0083] The edge portion 31 is in contact with the insertion hole 111 and the mounting groove 112, and thus can not have the filter hole 321. The thickness of the edge portion 31 is greater than the thickness of the middle portion 32, so that the joint of the edge portion 31 and the middle portion 32 has a stepped structure, and thus when the filter screen 3 is taken out of the pipe joint 1, the joint of the edge portion 31 and the middle portion 32 can be pulled by using a tool to pull the filter screen 3 out of the insertion hole 111. In this way, the operator can avoid inserting the tool into the filter hole 321 to pull the filter screen 3 out of the insertion hole 111, avoid wearing the filter hole 321, and avoid impurities in the tool from falling into the oil passage 12 from the filter hole 321.

[0084] For example, the thickness of the edge portion 31 can be 2 mm. The thickness of the middle portion 32 can be in the range of 0.4-0.6 mm, for example, the thickness of the middle portion 32 can be 0.5 mm.

[0085] In some examples, the flow area of a single filter hole 321 is less than the flow area of the oil passage 12, and the total flow area of a plurality of filter holes 321 is greater than the flow area of the oil passage 12. In this way, the filter screen 3 can filter impurities in the oil relative to the oil passage 12, so that impurities with larger particles are difficult to enter the oil passage 12 and scratch or damage the pressure sensing element or other electronic components, and the accuracy and reliability of the oil pressure sensor measurement can be improved. At the same time, the oil inlet amount of the oil passage 12 is not reduced, so that the oil pressure sensor can accurately measure.

[0086] In some examples, the number of filter holes 321 can be 15-20. If the number of filter holes 321 is too small, the flow area of the entire filter screen 3 will be less than the flow area of the oil passage 12, which can easily lead to inaccurate measurement of the oil pressure. If the number of filter holes 321 is too large, the overall strength of the filter screen 3 will be reduced, which is easy to damage.

[0087] For example, as shown in Figure 5 The number of filter screens 3 can be 17.

[0088] In some examples, as shown in Figure 2 The portion of the outer wall of the pipe joint 1 corresponding to the oil cavity 11 can have threads, and the portion of the pipe joint 1 corresponding to the oil cavity 11 is threadedly connected with the main oil passage.

[0089] Of course, in other examples, as shown in Figure 7As shown, considering that the portion of the pipe joint 1 corresponding to the oil cavity 11 is relatively thin, this portion can also not have threads, and thus the diameter D4 of the portion of the pipe joint 1 corresponding to the oil cavity 11 should be less than or equal to the minor diameter D3 of the threads of the portion of the pipe joint 1 corresponding to the oil passage 12. In this way, when the portion of the pipe joint 1 corresponding to the oil cavity 11 extends into the main oil passage, it will not be blocked by the threads in the main oil passage. If the diameter D4 of the portion of the pipe joint 1 corresponding to the oil cavity 11 is greater than the minor diameter D3 of the threads of the portion of the pipe joint 1 corresponding to the oil passage 12, the portion of the pipe joint 1 corresponding to the oil cavity 11 will not be able to extend into the main oil passage, and thus the oil pressure sensor will not be able to be connected to the main oil passage.

[0090] In some examples, as shown in FIG. 1, the oil pressure sensor further includes a housing 4, and the housing 4 has a terminal 41, one end of which is electrically connected to the pressure sensing element 2, and the other end of which is connected to an ECU on the vehicle, for outputting the oil pressure signal to the ECU in the form of a voltage. Figure 6

[0091] In the following, the working process of the oil pressure sensor will be described by way of example: Figures 1-4

[0092] First, the filter screen 3 is placed in the mounting groove 112 through the insertion hole 111, and then the oil pressure sensor is connected to the main oil passage. When the engine of the vehicle is running, the impurities in the oil in the main oil passage are filtered out by the filter screen 3 and then flow into the oil passage 12. The pressure sensing element 2 can detect the pressure of the oil and convert the pressure signal of the oil into an electrical signal, which is then output to the oil pressure gauge on the vehicle.

[0093] When the oil pressure detected by the oil pressure gauge is too low, the ECU controls the oil light on the oil pressure gauge to light up, and controls the variable oil pump to control the oil supply amount of the oil pump, until the oil pressure gauge displays 0.2-0.5 MPa (normal value of oil pressure). If the oil pressure gauge cannot always display the normal value of the oil pressure, check whether the filter holes 321 on the filter screen 3 in the oil pressure sensor are blocked. The specific process can include the following steps:

[0094] First, remove the oil pressure sensor from the main oil passage.

[0095] Second, remove the filter screen 3 from the mounting groove 112 and check whether the filter holes 321 on the filter screen 3 are blocked.

[0096] Third, if the filter holes 321 are blocked by impurities, clean the impurities in the filter holes 321 and wash the filter screen 3.

[0097] Fourth, after the filter screen 3 is dried, place it in the mounting groove 112 through the insertion hole 111.

[0098] ​​Fifth, connect the oil pressure sensor to the main oil passage.

[0099] After the oil pressure sensor is reinstalled, check the oil pressure gauge again to see if it displays the normal value. If the oil pressure gauge displays the normal value, the problem is resolved. If the oil pressure gauge still cannot display the normal value, check other components for the problem.

[0100] The above only describes optional embodiments of the present disclosure and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An engine oil pressure sensor characterized by comprising: The oil pressure sensor comprises a pipe joint (1), a pressure sensing element (2) and a filter screen (3). The pipe joint (1) has an oil cavity (11) and an oil channel (12) in communication, the oil cavity (11) is used for communication with a main oil channel, the diameter of the oil cavity (11) is larger than that of the oil channel (12), the outer wall of the pipe joint (1) has a threaded structure corresponding to the part of the oil channel (12), and the outer wall of the pipe joint (1) does not have a threaded structure corresponding to the part of the oil cavity (11). The pressure sensing element (2) is connected with the pipe joint (1) and communicates with the end of the oil channel (12) away from the oil cavity (11). The filter screen (3) comprises an edge part (31) and an intermediate part (32), the thickness of the edge part (31) is greater than that of the intermediate part (32), the intermediate part (32) has a plurality of filter holes (321), the side wall of the pipe joint (1) has an insertion hole (111) for plugging and unplugging the filter screen (3), the inner wall of the oil cavity (11) has a mounting groove (112) flush with the insertion hole (111), the edge part (31) is inserted into the insertion hole (111) and the mounting groove (112), and the side wall of the pipe joint (1) further has an opening (113) penetrating through the end of the pipe joint (1) and communicating with the insertion hole (111).

2. The engine oil pressure sensor of claim 1, wherein The length of the oil cavity (11) is less than that of the oil channel (12).

3. The oil pressure sensor according to claim 2, characterized by The length ratio of the oil cavity (11) to the oil channel (12) is 1:5-1:

3.

4. The oil pressure sensor according to claim 1, characterized by The filter screen (3) has a spacing with the oil channel (12).

5. The oil pressure sensor according to claim 1, characterized by The corresponding circumferential angle of the insertion hole (111) is 180°.

6. The oil pressure sensor according to claim 1, characterized by The flow area of a single filter hole (321) is less than that of the oil channel (12), and the total flow area of the plurality of filter holes (321) is greater than that of the oil channel (12).

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