Crankshaft position sensor with double-layer waterproof structure
By employing a double-layer sealing structure and an adaptive unidirectional sealing design, the problem of poor sealing performance in traditional crankshaft position sensors is solved, improving the sensor's waterproof performance and service life, and ensuring the sensor's reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-10
- Publication Date
- 2026-03-31
AI Technical Summary
Traditional crankshaft position sensors have limited sealing at the circuit board end, which cannot effectively resist axial micro-displacement caused by engine vibration. This can easily create gaps that allow water to seep in, leading to corrosion or short circuits and reducing service life.
The sealing element adopts a double-layer waterproof structure, including a first sealing part and a second sealing part, which respectively achieve axial and radial sealing. The stability of the sealing element is ensured by a limiting part and a threaded connection, and the sealing effect is improved by combining an adaptive unidirectional sealing structure.
It significantly improves the waterproof performance and service life of the crankshaft position sensor, prevents the formation of water seepage channels, avoids circuit board corrosion and short circuits, and ensures the reliability of the sensor.
Smart Images
Figure CN224066083U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of sensors, and in particular to a crankshaft position sensor with a double-layer waterproof structure. Background Technology
[0002] Crankshaft position sensors are exposed to harsh environments such as high temperature, high humidity, oil stains, and high-pressure water washing in the engine compartment for a long time. Traditional crankshaft position sensors have a side cover on the circuit board end, and the side cover and the circuit board end are usually sealed with O-rings. However, the sealing effect of a single layer of O-rings is limited. It only relies on radial compression to achieve a seal and cannot effectively resist the axial micro-displacement caused by engine vibration. It is easy to form gaps and water seepage channels, which can cause circuit board corrosion or short circuits, reduce the service life of the sensor, and cause the engine to fail to start and report errors. Utility Model Content
[0003] To overcome the shortcomings of the prior art, the technical solution adopted by this utility model is: a crankshaft position sensor with a double-layer waterproof structure, including a housing, a pin, a Hall circuit board, a seal, and a side cover. The housing has a socket and a mounting part at both ends, respectively. The pin is located inside the housing, and both ends of the pin extend to the socket and the mounting part, respectively. The mounting part is snapped with a Hall circuit board for electrically connecting the pin, and the mounting part is threadedly connected to the side cover. The mounting part is snapped with a seal for sealing the connection of the side cover. The seal has a first sealing part for abutting the end face of the side cover and a second sealing part for abutting the inner side surface of the side cover.
[0004] Using the above technical solution, the sealing element is integrally formed with a first sealing part and a second sealing part. The first sealing part and the second sealing part respectively achieve axial sealing and radial sealing at the connection between the housing and the side cover. The innovative two-seal structure significantly improves the waterproof performance and service life of the crankshaft position sensor.
[0005] The present invention is further configured such that the housing is provided with a limiting part coaxially distributed with the mounting part, the sealing member is provided with a central hole, and the sealing member is sleeved on the mounting part through the central hole, and the first sealing part is engaged between the mounting part and the limiting part.
[0006] Furthermore, the side cover is provided with internal threads, and the mounting part is provided with studs that are adapted to the internal threads.
[0007] By adopting the above technical solution, during the threaded installation process of the side cover, the limiting part acts as a rigid limiting stop, which effectively prevents the deformation of the sealing structure caused by the squeezing of the side cover and maintains the stability of the sealing structure.
[0008] The present invention is further configured such that the first sealing part is U-shaped in general, and the first sealing part is provided with a groove, and the side cover is provided with an annular part corresponding to the groove, and the end face of the annular part is engaged in the groove.
[0009] By adopting the above technical solution, the end face of the side cover extends and forms a non-threaded annular part, ensuring that the annular part fits tightly with the slot and improving the sealing performance of the side cover in the axial position.
[0010] The present invention is further configured such that the second sealing part is in the shape of an inverted V, and the second sealing part is provided with a downwardly inclined side arm facing the slot, the side arm abutting against the inner side of the ring part.
[0011] Furthermore, the slot has an inner circular surface, and the outer diameter of the side arm is larger than the inner diameter of the inner circular surface.
[0012] Using the above technical solution, the second sealing part is designed as an adaptive one-way sealing structure, which fits tightly against the inner wall of the side cover. When the air pressure inside the side cover is too high, the air pressure forces the side arm to deform and discharge the gas outward, thereby achieving the function of pressure relief and preventing the instantaneous increase in air pressure from affecting the installation of the sensor. Conversely, when the air pressure outside the side cover is too high, the air pressure makes the side wall and the side cover press tighter and tighter, thereby improving the radial sealing effect of the side cover.
[0013] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a top view of the housing of this utility model;
[0016] Figure 3 For the present utility model Figure 1 A magnified view of the central A-direction view;
[0017] Figure 4 This is a cross-sectional view of the sealing element of this utility model;
[0018] Wherein: 1-housing, 2-pin, 3-Hall circuit board, 4-seal, 5-side cover, 11-socket, 12-mounting part, 13-limiting part, 14-stud, 41-first sealing part, 42-second sealing part, 43-center hole, 44-slot, 45-side arm, 46-inner circular surface, 51-internal thread, 52-ring part; Detailed Implementation
[0019] like Figure 1-3As shown, this embodiment provides a crankshaft position sensor with a double-layer waterproof structure, including a housing 1, a pin 2, a Hall circuit board 3, a seal 4, and a side cover 5. The housing 1 has a socket portion 11 and a mounting portion 12 at both ends. The pin 2 is located inside the housing 1, and both ends of the pin 2 extend to the socket portion 11 and the mounting portion 12, respectively. The mounting portion 12 is snapped with the Hall circuit board 3 for electrically connecting the pin 2, and the mounting portion 12 is threadedly connected to the side cover 5. The mounting portion 12 is snapped with the seal 4 for sealing the connection of the side cover 5. The seal 4 has a first sealing portion 41 for abutting the end face of the side cover 5 and a second sealing portion 42 for abutting the inner side surface of the side cover 5. The seal 4 is integrally formed with the first sealing portion 41 and the second sealing portion 42, and the first sealing portion 41 and the second sealing portion 42 respectively achieve axial sealing and radial sealing at the connection between the housing 1 and the side cover 5.
[0020] Combination Figure 4 As shown, in this embodiment, the housing 1 is provided with a limiting part 13 coaxially distributed with the mounting part 12, the sealing member 4 is provided with a central hole 43, the limiting part 13 is snapped into the sealing member 4 through the central hole 43, the first sealing part 41 is snapped into the mounting part 12 and the limiting part 13, the limiting part 13 serves as a rigid limiting stop, effectively preventing the deformation of the sealing member 4 structure caused by the squeezing of the side cover 5, and maintaining the stability of the sealing member 4 structure. The side cover 5 is provided with an internal thread 51, and the mounting part 12 is provided with a stud 14 that is adapted to the internal thread 51.
[0021] In this embodiment, the first sealing part 41 is U-shaped in general, and the first sealing part 41 is provided with a groove 44. The side cover 5 is provided with an annular part 52 corresponding to the groove 44. The end face of the annular part 52 is engaged in the groove 44. The end face of the side cover 5 extends and forms an unthreaded annular part 52, ensuring that the annular part 52 fits tightly with the groove 44 and improving the sealing performance of the side cover 5 in the axial position.
[0022] In this embodiment, the second sealing part 42 is generally inverted V-shaped. The second sealing part 42 has a downwardly inclined side arm 45 facing the slot 44. The side arm 45 abuts against the inner side of the annular part 52. The slot 44 has an inner circular surface 46. The outer diameter D of the side arm 45 is larger than the inner diameter d of the inner circular surface 46. The second sealing part 42 is designed as an adaptive one-way sealing structure, which fits tightly against the inner wall of the side cover 5. When the air pressure inside the side cover 5 is too high, the air pressure forces the side arm 45 to deform and discharge gas outward, thereby achieving the function of pressure relief and preventing the instantaneous increase of air pressure from affecting the installation of the sensor. Conversely, when the air pressure outside the side cover 5 is too high, the air pressure makes the side wall and the side cover 5 press tighter and tighter, thereby improving the radial sealing effect of the side cover 5.
[0023] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A two-layer waterproofed crank position sensor, characterized by, The application relates to a shell (1), a pin (2), a Hall circuit board (3), a sealing element (4) and a side cover (5), the shell (1) is provided with a socket part (11) and a mounting part (12) at two ends respectively, the pin (2) is arranged in the shell (1), and the two ends of the pin (2) extend to the socket part (11) and the mounting part (12) respectively, the Hall circuit board (3) for electrically connecting the pin (2) is clamped to the mounting part (12), the side cover (5) is screw-connected to the mounting part (12), the sealing element (4) for sealingly connecting the side cover (5) is clamped to the mounting part (12), the sealing element (4) is provided with a first sealing part (41) for abutting against an end face of the side cover (5) and a second sealing part (42) for abutting against an inner side face of the side cover (5).
2. A two-layer waterproofed crank position sensor according to claim 1, characterized in that: The shell (1) is provided with a limiting part (13) coaxially distributed with the mounting part (12), the sealing element (4) is provided with a center hole (43), and the sealing element (4) is sleeved on the mounting part (12) through the center hole (43), and the first sealing part (41) is clamped between the mounting part (12) and the limiting part (13).
3. A two-layer waterproofed crank position sensor according to claim 2, characterized in that: The side cover (5) is provided with an internal thread (51), and the mounting part (12) is provided with a stud (14) matched with the internal thread (51).
4. A two-layer waterproofed crank position sensor according to claim 3, characterized in that: The first sealing part (41) is in a U shape as a whole, and the first sealing part (41) is provided with a clamping groove (44), the side cover (5) is provided with a ring part (52) corresponding to the clamping groove (44), and an end face of the ring part (52) is clamped in the clamping groove (44).
5. A two-layer waterproofed crank position sensor according to claim 4, characterized in that: The second sealing part (42) is in an inverted V shape as a whole, and the second sealing part (42) is provided with an inclined downward side arm (45) towards the clamping groove (44), and the side arm (45) abuts against an inner side face of the ring part (52).
6. A two-layer waterproofed crank position sensor according to claim 5, characterized in that: The clamping groove (44) is provided with an inner circular face (46), and an outer diameter of the side arm (45) is larger than an inner diameter of the inner circular face (46).