ABS wheel speed sensor based on magnetic resistance technology

Abstract

The utility model relates to an ABS wheel speed sensor based on magnetic resistance technology, which comprises a sensor main body, a base, an insert and a side cover, the base is integrally formed by injection molding on the basis of the insert, the base is provided with a center hole for accommodating a signal wheel and a connecting groove for installing the sensor main body, the base is detachably connected with the side cover, and the side cover is provided with a through hole. The sensor main body is provided with a sensing end and a wiring end, the sensing end is clamped in the connecting groove, and the wiring end penetrates through the side cover and extends outwards; the main purpose of the utility model is that the metal insert is pre-embedded in the base and is combined with the plastic substrate through an integrated injection molding process to form a composite reinforced structure, and the metal insert can bear the radial load transmitted by the hub bearing, so that the wheel speed sensor is prevented from being separated from the hub due to the deformation of the base; the gap stability between the sensor and the signal wheel is ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of sensors, and in particular to an ABS wheel speed sensor based on magnetoresistive technology. Background Technology

[0002] Wheel speed sensors, as a key component in automotive anti-lock braking systems, are used to monitor wheel speed in real time. They typically employ Hall effect or magnetoresistive technology, generating pulse signals by detecting changes in the tooth grooves of the signal wheel as the wheel rotates. These signals are then transmitted to the control unit to achieve precise brake adjustment. Traditional wheel speed sensors often have plastic bases, which are connected to the hub bearing's connecting disc via snap-fit ​​and adhesive bonding. Because wheel speed sensors are prone to deformation when subjected to radial loads transmitted from the hub bearing over long periods, gaps may appear between the sensor and the signal wheel, or the sensor may even detach from the hub, resulting in signal loss and error reports. Utility Model Content

[0003] To overcome the shortcomings of the prior art, the technical solution adopted by this utility model is: an ABS wheel speed sensor based on magnetoresistive technology, including a sensor body, a base, an insert and a side cover. The base is integrally injection molded on the basis of the insert. The base is provided with a central hole for accommodating the signal wheel and a connecting groove for installing the sensor body. The base is detachably connected to the side cover. The sensor body is provided with a sensing end and a wiring end. The sensing end is snapped into the connecting groove, and the wiring end extends outward through the side cover.

[0004] Using the above technical solution, the base and the hub bearing are connected by a snap-fit ​​and sealed with adhesive. When the sensor body is damaged, there is no need to destroy the adhesive layer. The sensor body can be replaced simply by opening the side cover, avoiding the problem of reduced sealing reliability caused by repeated sealing. The base has a metal insert embedded inside, which is combined with the plastic matrix through an integrated injection molding process to form a composite reinforced structure. The metal insert can withstand the radial load transmitted by the hub bearing, preventing the wheel speed sensor from detaching from the hub due to base deformation, and ensuring the stability of the gap between the sensor and the signal wheel.

[0005] The present invention is further configured such that the sensor body is provided with a stepped portion between the sensing end and the wiring end, and the side cover and the base are respectively provided with a first stepped surface and a second stepped surface for engaging the upper and lower sides of the stepped portion.

[0006] Furthermore, the stepped portion has a sealing groove on the side facing the sensing end for installing a sealing ring, and the sensing end is sealed to the base through the sealing groove.

[0007] By adopting the above technical solution, the sensor body is snapped between the base and the side cover through the stepped part, the assembly gap is eliminated by the sealing ring, and the opening of the connecting groove is sealed by the sealing ring to prevent water vapor and oil stains from entering the sensing end, thereby improving the reliability of the wheel speed sensor.

[0008] The present invention is further configured such that the base is provided with a trapezoidal groove and a snap-fit ​​part, the side cover is provided with a positioning block for snapping the trapezoidal groove, and a snap-fit ​​groove for snapping the protrusion.

[0009] Using the above technical solution, the base is snapped with the side cover by the snap-fit ​​part. During installation, the inclined surface of the trapezoidal groove guides the quick installation and prevents the side cover from rotating relative to the base. The overall structure is simple and easy to install.

[0010] The present invention is further configured such that the insert has an upper circular portion and a lower circular portion coaxially distributed, and the upper circular portion and the lower circular portion have circumferentially distributed sawtooth grooves.

[0011] Furthermore, both the upper and lower circular portions are provided with flow grooves for plastic molding, and the upper circular portion is provided with an opening groove to avoid the sensor body.

[0012] Using the above technical solution, the insert is formed by bending and welding processes, and the outer end faces of its upper and lower circular parts are exposed to ensure the cylindricity of the outer side of the base and improve the radial load-bearing capacity of the base. The opening slot ensures that the Hall signal between the sensor body and the signal wheel is not attenuated, thereby improving the sensor's sensing accuracy.

[0013] The present invention is further configured such that the side cover has an outer ring portion, and an annular groove for wrapping the end face of the connecting disc of the wheel hub bearing is formed between the outer ring portion and the base.

[0014] By adopting the above technical solution, the side cover wraps around the connecting plate through the outer ring, further isolating external magnetic particles and effectively blocking external impurities such as iron filings and magnetic particles from approaching the sensing end. In addition, the outer side of the side cover is easy to clean, improving the anti-interference performance of the wheel speed sensor.

[0015] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is the front view of the present invention;

[0017] Figure 2 This is an exploded view of the structure of this utility model;

[0018] Figure 3 This is a perspective view of the side cover of this utility model;

[0019] Figure 4 This is a perspective view of the sensor body of this utility model;

[0020] Figure 5 This is a perspective view of the insert of this utility model;

[0021] Figure 6 This is a perspective view of the present utility model;

[0022] Wherein: 1-Sensor body, 2-Base, 3-Insert, 4-Side cover, 5-Sealing ring, 11-Sensing end, 12-Wiring end, 13-Step portion, 14-Sealing groove, 15-Circular groove, 21-Center hole, 22-Connecting groove, 23-Second step surface, 24-Trapezoidal groove, 25-Snap-fit ​​portion, 31-Upper circle, 32-Lower circle, 33-Serrated groove, 34-Flow groove, 35-Opening groove, 41-First step surface, 42-Positioning block, 43-Snap-fit ​​groove, 44-Outer ring portion; Detailed Implementation

[0023] like Figure 1 , 2 As shown, this embodiment provides an ABS wheel speed sensor based on magnetoresistive technology, including a sensor body 1, a base 2, an insert 3, and a side cover 4. The base 2 is integrally injection molded on the basis of the insert 3. The base 2 is provided with a central hole 21 for accommodating the signal wheel and a connecting groove 22 for mounting the sensor body 1. The side cover 4 is detachably connected to the base 2. The sensor body 1 is provided with a sensing end 11 and a wiring end 12. The sensing end 11 is snapped into the connecting groove 22, and the wiring end 12 extends outward through the side cover 4.

[0024] Combination Figure 3 , 4 As shown, in this embodiment, the sensor body 1 is provided with a stepped portion 13 between the sensing end 11 and the wiring end 12. The side cover 4 and the base 2 are respectively provided with a first stepped surface 41 and a second stepped surface 23 for engaging the upper and lower sides of the stepped portion 13. The side of the stepped portion 13 facing the sensing end 11 is provided with a sealing groove 14 for installing the sealing ring 5. The sensing end 11 is sealed to the base 2 through the sealing groove 14. The stepped portion 13 enables the sensor body 1 to be engaged between the base 2 and the side cover 4. The sealing ring 5 eliminates the assembly gap and seals the opening of the connecting groove 22.

[0025] In this embodiment, the base 2 is provided with a trapezoidal groove 24 and a snap-fit ​​part 25, and the side cover 4 is provided with a positioning block 42 for snapping the trapezoidal groove 24 and a snap-fit ​​groove 43 for snapping the protrusion. The base 2 is snapped with the side cover 4 through the snap-fit ​​part 25. During installation, the inclined surface of the trapezoidal groove 24 has the function of guiding quick installation and preventing the side cover 4 from rotating relative to the base 2.

[0026] Combination Figure 5As shown, in this embodiment, the insert 3 has an upper circular portion 31 and a lower circular portion 32 coaxially distributed. The upper circular portion 31 and the lower circular portion 32 are provided with circumferentially distributed sawtooth grooves 33. Both the upper circular portion 31 and the lower circular portion 32 are provided with flow grooves 34 for plastic molding. The upper circular portion 31 is provided with an opening groove 35 to avoid the sensor body 1. The insert 3 is formed by bending and welding processes. The outer end faces of its upper circular portion 31 and lower circular portion 32 are exposed to ensure the cylindricity of the outer side of the base 2 and improve the radial load-bearing capacity of the base 2. The opening groove 35 ensures that the Hall signal between the sensor body 1 and the signal wheel is not attenuated.

[0027] Combination Figure 6 As shown, in this embodiment, the side cover 4 is provided with an outer ring portion 44, and an annular groove 15 is formed between the outer ring portion 44 and the base 2 for wrapping the end face of the connecting disc of the wheel hub bearing. The side cover 4 further isolates external magnetic particles, effectively blocking external iron filings, magnetic particles and other impurities from approaching the sensing end 11. The outer side of the side cover 4 is easy to clean, improving the anti-interference performance of the wheel speed sensor.

[0028] The working principle of this utility model is that the base 2 and the side cover 4 are sleeved on the end face of the connecting disc of the wheel hub bearing. The signal teeth of the axle extend to the center hole 21 and are close to the sensing end 11 of the sensor body 1. The SIGNAL end and VCC end of the wiring terminal 12 are externally connected to the ECU. When the axle rotates, the magnetic field of the sensor body 1 is affected by the signal teeth to generate an electrical signal and output a continuous pulse waveform. The ECU calculates the real-time vehicle speed.

[0029] 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. An ABS wheel speed sensor based on magnetoresistive technology, characterized in that, The sensor body (1), base (2), insert (3) and side cover (4) are included. The base (2) is integrally injection molded on the basis of the insert (3). The base (2) is provided with a central hole (21) for accommodating the signal wheel and a connecting groove (22) for mounting the sensor body (1). The base (2) is detachably connected to the side cover (4). The sensor body (1) is provided with a sensing end (11) and a wiring end (12). The sensing end (11) is snapped into the connecting groove (22), and the wiring end (12) extends outward through the side cover (4).

2. The ABS wheel speed sensor based on magnetoresistive technology according to claim 1, characterized in that: The sensor body (1) is provided with a stepped portion (13) between the sensing end (11) and the wiring end (12). The side cover (4) and the base (2) are respectively provided with a first stepped surface (41) and a second stepped surface (23) for engaging the upper and lower sides of the stepped portion (13).

3. The ABS wheel speed sensor based on magnetoresistive technology according to claim 2, characterized in that: The stepped portion (13) has a sealing groove (14) for installing a sealing ring on the side facing the sensing end (11), and the sensing end (11) is sealed to the base (2) through the sealing groove (14).

4. The ABS wheel speed sensor based on magnetoresistive technology according to claim 3, characterized in that: The base (2) is provided with a trapezoidal groove (24) and a snap-fit ​​part (25), and the side cover (4) is provided with a positioning block (42) for snapping the trapezoidal groove (24) and a snap-fit ​​groove (43) for snapping the protrusion.

5. The ABS wheel speed sensor based on magnetoresistive technology according to claim 1, characterized in that: The insert (3) has an upper circular portion (31) and a lower circular portion (32) that are coaxially distributed, and the upper circular portion (31) and the lower circular portion (32) have circumferentially distributed serrated grooves (33).

6. The ABS wheel speed sensor based on magnetoresistive technology according to claim 5, characterized in that: Both the upper circular portion (31) and the lower circular portion (32) are provided with flow grooves (34) for plastic molding, and the upper circular portion (31) is provided with an opening groove (35) for avoiding the sensor body (1).

7. The ABS wheel speed sensor based on magnetoresistive technology according to claim 1, characterized in that: The side cover (4) is provided with an outer ring (44), and an annular groove (15) is formed between the outer ring (44) and the base (2) for wrapping the end face of the connecting disc of the wheel hub bearing.

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