High-precision modularized vehicle body height sensor

Abstract

The utility model discloses a high precision modularization car body height sensor, including shell, steel magnetic subassembly, shaft, circuit board, water seal and bottom cover, the steel magnetic subassembly includes magnet frame, and inlay in the magnet frame, magnet yoke and magnetic steel, the bushing and magnet yoke are coaxially distributed at the upper side and lower side of magnet frame, the magnet frame passes through the bushing and is clamped on the shaft, the shaft passes through the circuit board, the magnetic steel passes through the shaft, and the magnetic steel passes through the shaft. According to the utility model, the magnet frame adopts an integrated injection molding process, and the bushing, the magnet yoke and the magnetic steels are fixed at preset positions, so that the steel magnetic assembly is permanently fixed in a modularized manner, and the magnetic steels are prevented from falling off due to aging of glue; when the rotating shaft drives the steel magnetic assembly to rotate, the magnetic field changes uniformly and linearly, the assembling difficulty is reduced, and the service life of the sensor is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of Hall sensors, and in particular to a high-precision modular vehicle height sensor. Background Technology

[0002] The vehicle height sensor is an important component of the automotive electronic control system. It is mainly used to detect the relative displacement between the vehicle body and the lower suspension arm or shock absorber support. Its working principle is that the change in vehicle height drives the rotating shaft through the rocker arm, which changes the magnetic field around the Hall chip. The Hall chip then outputs a corresponding voltage signal, thereby realizing the detection of vehicle height.

[0003] However, existing vehicle height sensors have the risk of magnet delamination. For example, patent number CN201420009835.9 discloses a vehicle height sensor in which the magnet and the magnetic steel are separate. In order to fix the magnet, the traditional installation process is to fix the magnet to the mounting plate with hot melt adhesive. During the long-term driving of the vehicle, the adhesive layer is prone to cracking, which eventually leads to the magnet delamination and displacement, causing the sensor to fail. Utility Model Content

[0004] To overcome the shortcomings of the prior art, the technical solution adopted by this utility model is as follows: a high-precision modular vehicle height sensor, including a housing, a steel magnetic assembly, a rotating shaft, a circuit board, a water seal, and a bottom cover. The housing is rotatably connected to the rotating shaft, one end of which is provided with a rocker arm, and the other end is fixedly connected to the steel magnetic assembly. The bottom of the housing is connected to the circuit board, which is provided with a Hall chip for feedback of the rocker arm rotation. The top of the housing is sealed to the rotating shaft through the water seal, and the bottom is sealed to the bottom cover. The steel magnetic assembly includes a magnet frame, and a bushing, a yoke, and magnets embedded in the magnet frame. The bushing and the yoke are coaxially distributed on the upper and lower sides of the magnet frame. The magnet frame is snapped to the rotating shaft through the bushing. The two ends of the inner side of the yoke are provided with parallel magnets. The Hall chip is located between the two sets of magnets.

[0005] Using the above technical solution, the magnet frame adopts an integrated injection molding process to fix the bushing, magnetic yoke and magnet in the preset position, so that the steel magnet assembly is permanently modularly fixed, preventing the magnet from falling off due to glue aging. When the rotating shaft drives the steel magnet assembly to rotate, the magnetic field changes uniformly and linearly, reducing assembly difficulty and improving the service life of the sensor.

[0006] The present invention is further configured such that the magnetic yoke is a ring structure, and the magnetic yoke has two sets of parallel straight sections, and the magnet is attached to the inner side of the straight section.

[0007] Furthermore, the magnet holder has a process groove one at the top of the straight section and a process groove two at the bottom of the magnet.

[0008] Furthermore, the magnetic poles of the two sets of magnets are in the same direction.

[0009] Using the above technical solution, the magnet frame is integrally injection molded based on the magnetic yoke, and the injection mold is provided with process groove one and process groove two for fixing the magnetic yoke and magnets, ensuring that the positional relationship of the magnetic yoke and magnets is the same after each batch of magnet frames is injection molded.

[0010] The positioning of the straight section ensures that the magnetic induction lines of the two sets of magnets are parallel, eliminating magnetic field distortion caused by installation deviations and making the output signal more stable.

[0011] The present invention is further configured such that the circuit board is provided with a Hall frame, the Hall frame is provided with snap-fit ​​pins for connecting the circuit board and a receiving groove for accommodating the Hall chip, and the magnetic yoke is provided with an inner cavity for accommodating the Hall frame.

[0012] Using the above technical solution, the Hall frame is made of plastic, which will not interfere with the Hall chip receiving surrounding electromagnetic signals. The receiving groove encloses the Hall chip in the Hall frame to prevent the chip from being bumped or squeezed during assembly, ensuring that the sensing surface of the chip is accurately located between the two sets of magnets and maintaining the stability of the structure.

[0013] The present invention is further configured such that the rotating shaft is provided with an upper positioning tooth and a lower positioning tooth, and an annular groove provided at the upper positioning tooth; the rotating shaft is connected to the rocker arm through the upper positioning tooth; and the bushing is engaged with the rotating shaft through the lower positioning tooth.

[0014] Using the above technical solution, the rocker arm is integrally injection molded on the basis of the rotating shaft. The upper positioning teeth and the annular groove are used to limit the circumferential rotation and axial movement of the rocker arm relative to the rotating shaft, respectively. After the rotating shaft passes through the water seal and the outer shell, the steel magnetic component is pressed by a servo press. The lower positioning teeth are used to limit the circumferential rotation of the steel magnetic component relative to the rotating shaft, ensuring that the rocker arm and the steel magnetic component are aligned, making the sensor sensitive and accurate.

[0015] The present invention is further configured such that a pin frame is provided on one side of the outer shell, and a pin member is provided in the pin frame, one end of the pin member is electrically connected to the circuit board, and the other end is combined with the outer shell to form a plug-in part.

[0016] Using the above technical solution, the pin skeleton is injection molded at the pin component in one step, and the outer shell is injection molded on the basis of the pin skeleton in a second step, ensuring that each pin component is in the preset position.

[0017] The present invention is further configured such that the pin component includes a main body and pin portions located at both ends of the main body, and a circular portion embedded in the pin skeleton is provided at the center of the main body.

[0018] Furthermore, the width of the main body is greater than the width of the pin portion.

[0019] Using the above technical solution, the insert part is integrally stamped and formed. The middle position of the insert part is widened to improve the structural strength of the insert part and effectively resist the impact during injection molding. The circular part prevents the insert part from moving relative to the insert skeleton, so that the extension length of the insert part is uniform and without deviation.

[0020] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a cross-sectional view of the present invention;

[0023] Figure 3 This is an exploded view of the steel-magnetic assembly of this utility model;

[0024] Figure 4 This is a cross-sectional view of the steel magnet assembly of this utility model;

[0025] Figure 5 This is the utility model Figure 2 A magnified view of a section at point A in the middle;

[0026] Figure 6 This is a front view of the rotating shaft of this utility model;

[0027] Figure 7 This is a perspective view of the pin frame of this utility model;

[0028] Figure 8 This is a perspective view of the pin assembly of this utility model;

[0029] Wherein: 1-outer shell, 2-steel magnetic assembly, 3-rotating shaft, 4-circuit board, 5-water seal, 6-bottom cover, 7-Hall chip, 8-Hall frame, 9-bulb bearing, 10-plug part, 11-pin frame, 12-pin part, 121-main body, 122-pin part, 123-circular ring part, 21-magnet frame, 22-bulb, 23-magnetic yoke, 24-magnet, 211-process groove one, 212-process groove two, 231-straight part, 232-inner cavity, 30-rocker arm, 31-upper positioning tooth, 32-circular groove, 33-lower positioning tooth, 81-clamping foot, 82-accommodating groove; Detailed Implementation

[0030] The embodiments of this utility model will now be described with reference to the accompanying drawings. In this process, to ensure clarity and convenience, we may exaggerate the width of lines or the size of constituent elements in the drawings.

[0031] Furthermore, the terms used below are defined based on the functions of this utility model and may vary depending on the intentions or conventions of the user or operator. Therefore, these terms are defined based on the entire contents of this specification.

[0032] like Figure 1-3 As shown, this utility model provides a high-precision modular vehicle height sensor, including a housing 1, a steel magnetic assembly 2, a rotating shaft 3, a circuit board 4, a water seal 5, and a bottom cover 6. The housing 1 has a built-in bushing bearing 9, which is rotatably connected to the rotating shaft 3. One end of the rotating shaft 3 is integrally injection molded with a rocker arm 30, and the other end is fixedly connected to the steel magnetic assembly 2. The bottom of the housing 1 is connected to the circuit board 4, which is equipped with a Hall chip 7 for feedback of the rotation amount of the rocker arm 30. The top of the housing 1 is sealed to the rotating shaft 3 through the water seal 5, and the bottom is sealed to the bottom cover 6 through epoxy resin. The steel magnetic assembly 2 includes a magnet frame 21, and a bushing 22, a magnetic yoke 23, and magnets 24 embedded in the magnet frame 21. The bushing 22 and the magnetic yoke 23 are coaxially distributed on the upper and lower sides of the magnet frame 21. The magnet frame 21 is snapped to the rotating shaft 3 through the bushing 22. The two ends of the inner side of the magnetic yoke 23 are provided with parallel magnets 24, and the Hall chip 7 is located between the two sets of magnets 24.

[0033] Combination Figure 3 , 4 As shown, in this embodiment, the magnetic yoke 23 has a ring structure and two sets of parallel straight sections 231. The magnets 24 are attached to the inner side of the straight sections 231. The magnet frame 21 has a process groove 211 at the top of the straight section 231 and a process groove 212 at the bottom of the magnets 24. The magnetic poles of the two sets of magnets 24 have the same direction. The magnet frame 21 is integrally injection molded on the basis of the magnetic yoke 23. The injection mold has process grooves 211 and 212 for fixing the magnetic yoke 23 and the magnets 24, ensuring that the positional relationship of the magnetic yoke 23 and the magnets 24 is the same after each batch of magnet frames 21 is injection molded. The positioning of the straight section 231 ensures that the magnetic induction lines of the two sets of magnets 24 are parallel, eliminating magnetic field distortion caused by installation deviation and making the output signal more stable.

[0034] Combination Figure 5 As shown, in this embodiment, the circuit board 4 is provided with a Hall frame 8, the Hall frame 8 is provided with a snap-fit ​​pin 81 for connecting the circuit board 4, and a receiving groove 82 for accommodating the Hall chip 7. The magnetic yoke 23 is provided with an inner cavity 232 for accommodating the Hall frame 8. The receiving groove 82 wraps the Hall chip 7 inside the Hall frame 8 to prevent the chip from being bumped or squeezed during assembly, and to ensure that the sensing surface of the chip is accurately located between the two sets of magnets 24, thus maintaining the stability of the structure.

[0035] Combination Figure 6As shown, in this embodiment, the rotating shaft 3 is provided with an upper positioning tooth 31 and a lower positioning tooth 33, as well as an annular groove 32 provided at the upper positioning tooth 31. The rotating shaft 3 is connected to the rocker arm 30 through the upper positioning tooth 31. The bushing 22 is snapped onto the rotating shaft 3 through the lower positioning tooth 33. The rocker arm 30 is integrally injection molded on the basis of the rotating shaft 3. The upper positioning tooth 31 and the annular groove 32 are used to restrict the circumferential rotation and axial movement of the rocker arm 30 relative to the rotating shaft 3, respectively. The lower positioning tooth 33 is used to restrict the circumferential rotation of the steel magnet assembly 2 relative to the rotating shaft 3, ensuring that the rocker arm 30 and the steel magnet assembly 2 are aligned, so that the sensor is sensitive and accurate.

[0036] Combination Figure 7 , 8 As shown, in this embodiment, a pin frame 11 is provided on one side of the outer shell 1, and a pin member 12 is provided in the pin frame 11. One end of the pin member 12 is electrically connected to the circuit board 4, and the other end is combined with the outer shell 1 to form a plug-in part 10. The pin frame 11 is injection molded at the pin member 12 in one injection molding process, and the outer shell 1 is injection molded on the basis of the pin frame 11 in a second injection molding process to ensure that each pin member 12 is in a preset position. The pin member 12 includes a main body 121 and pin parts 122 provided at both ends of the main body 121. The center of the main body 121 is provided with a ring part 123 embedded in the pin frame 11. The width of the main body 121 is greater than the width of the pin part 122. The pin member 12 is integrally stamped. The middle position of the pin member 12 is widened to improve the structural strength of the pin member 12, effectively resist the impact during injection molding, and the ring part 123 prevents the pin member 12 from moving relative to the pin frame 11, so that the extension length of the pin member 12 is uniform and without deviation.

[0037] In this utility model, the magnet frame 21 adopts an integrated injection molding process to fix the bushing 22, the magnetic yoke 23 and the magnet 24 in a preset position, so that the steel magnet assembly 2 is permanently modularly fixed, preventing the magnet 24 from falling off due to glue aging. During installation, the rotating shaft 3 passes through the water seal 5 and the outer shell 1, and then the steel magnet assembly 2 is pressed by a servo press. When the rotating shaft 3 drives the steel magnet assembly 2 to rotate, the magnetic field changes uniformly and linearly, reducing the assembly difficulty and improving the service life of the sensor.

[0038] 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 high-precision modular vehicle height sensor, comprising a housing (1), a steel magnet assembly (2), a rotating shaft (3), a circuit board (4), a water seal (5), and a bottom cover (6), wherein the housing (1) is rotatably connected to the rotating shaft (3), one end of the rotating shaft (3) is provided with a rocker arm (30), and the other end is fixedly connected to the steel magnet assembly (2), the bottom of the housing (1) is connected to the circuit board (4), the circuit board (4) is provided with a Hall chip (7) for feedback of the rotation amount of the rocker arm (30), the top of the housing (1) is sealed to the rotating shaft (3) through the water seal (5), and the bottom is sealed to the bottom cover (6), characterized in that, The steel-magnet assembly (2) includes a magnet frame (21), and a bushing (22), a yoke (23), and a magnet (24) embedded in the magnet frame (21). The bushing (22) and the yoke (23) are coaxially distributed on the upper and lower sides of the magnet frame (21). The magnet frame (21) is snapped onto the rotating shaft (3) through the bushing (22). Parallel magnets (24) are provided at both ends of the inner side of the yoke (23). The Hall chip (7) is located between the two sets of magnets (24).

2. A high precision modular vehicle height sensor as claimed in claim 1, wherein: The magnetic yoke (23) has a ring structure and two sets of parallel straight sections (231) are provided on the magnetic yoke (23). The magnet (24) is attached to the inner side of the straight section (231).

3. A high precision modular vehicle height sensor as claimed in claim 2, wherein: The magnet holder (21) is provided with a process groove one (211) at the top of the straight section (231), and the magnet holder (21) is provided with a process groove two (212) at the bottom of the magnet (24).

4. A high precision modular vehicle height sensor as claimed in claim 3, wherein: The magnetic poles of the two sets of magnets (24) are in the same direction.

5. A high precision modular vehicle height sensor as claimed in claim 1, wherein: The circuit board (4) is provided with a Hall frame (8), the Hall frame (8) is provided with a snap pin (81) for connecting the circuit board (4) and a receiving groove (82) for accommodating the Hall chip (7), and the magnetic yoke (23) is provided with an inner cavity (232) for accommodating the Hall frame (8).

6. A high precision modular vehicle height sensor as claimed in claim 1, wherein: The rotating shaft (3) is provided with an upper positioning tooth (31) and a lower positioning tooth (33), and an annular groove (32) provided at the upper positioning tooth (31). The rotating shaft (3) is connected to the rocker arm (30) through the upper positioning tooth (31), and the bushing (22) is engaged with the rotating shaft (3) through the lower positioning tooth (33).

7. A high precision modular vehicle height sensor as claimed in claim 1, wherein: The outer casing (1) has a pin frame (11) on one side and a pin member (12) disposed in the pin frame (11). One end of the pin member (12) is electrically connected to the circuit board (4), and the other end is combined with the outer casing (1) to form a plug-in part (10).

8. A high precision modular vehicle height sensor as claimed in claim 7, wherein: The pin component (12) includes a main body (121) and pins (122) located at both ends of the main body (121). The center of the main body (121) is provided with a ring (123) embedded in the pin skeleton (11).

9. A high precision modular vehicle height sensor as claimed in claim 8, wherein: The width of the main body (121) is greater than the width of the pin (122).

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