Wheel speed sensor with multi-environment adaptability

Abstract

The utility model relates to a wheel speed sensor with multi-environment adaptability. The wheel speed sensor comprises a Hall framework, a contact pin, a sealing cover, a circuit board and a positioning ring, the utility model mainly aims to adopt a secondary injection molding process, embed the Hall framework and the positioning ring in the sealing cover, fully coat the epoxy resin in the sensing groove to form a protective layer, and simultaneously utilize the positioning block to fix the Hall framework in the cavity of the mold, thereby effectively counteracting the impact of high-pressure melt, preventing the Hall framework from deviating, and improving the reliability of the Hall sensor. The stability of the terminal structure is ensured, and the sensor has excellent waterproof and moisture-proof performance and is applied to harsh working conditions such as damp, muddy, high-vibration and the like.

Description

Technical Field

[0001] This utility model relates to the technical field of sensors, and in particular to a wheel speed sensor with multi-environment adaptability. Background Technology

[0002] In existing wheel speed sensor manufacturing processes, the Hall frame is usually formed by one-piece injection molding to create a sealing cover for connecting the wheel hub bearing. Because the Hall frame needs to be subjected to the impact of high temperature and high pressure molten material during the injection molding process, it is easy for the Hall frame to undergo a small displacement within the mold, resulting in deviation of the pin position at the terminal and thus affecting the reliability of the sensor's power connection. Utility Model Content

[0003] To overcome the shortcomings of the prior art, the technical solution adopted by this utility model is as follows: a wheel speed sensor with multi-environment adaptability, including a Hall frame, a pin, a sealing cover, a circuit board and a positioning ring. The Hall frame has a pin embedded in it. A sensing groove is provided on one side of the Hall frame. A circuit board that electrically connects to the pin is installed in the sensing groove. A resin layer for covering the circuit board is provided at the opening of the sensing groove. Positioning blocks for shaping are provided around the Hall frame. The upper and lower ends of the sealing cover are integrally injection molded based on the Hall frame and the positioning ring, respectively. The sealing cover and the pin are combined to form a terminal.

[0004] The above technical solution employs a two-stage injection molding process to embed the Hall frame and positioning ring within the sealing cover. A protective layer is formed by fully coating the sensing groove with epoxy resin, while the positioning block is used to fix the Hall frame within the mold cavity. This effectively counteracts the impact of the high-pressure molten material and prevents the Hall frame from shifting, ensuring the stability of the terminal structure. It also gives the sensor excellent waterproof and moisture-proof performance, making it suitable for harsh working environments such as dampness, mud, and high vibration.

[0005] The present invention is further configured such that the Hall frame has a first bent portion, a second bent portion, a third bent portion and a sensing portion connected in sequence, the sensing groove is provided at the sensing portion, and one end of the pin extends into the sensing groove by passing through the first bent portion, the second bent portion and the third bent portion in sequence.

[0006] Furthermore, the sealing cover has a rectangular portion for accommodating the sensing part, and positioning blocks coplanar with the surface of the rectangular portion are provided around the sensing part. The first bent portion has a small plane perpendicular to the direction of the wiring terminal.

[0007] Using the above technical solution, the Hall frame is integrally injection molded on the basis of the pin, and the first bend, the second bend, the third bend and the sensing part are formed along the contour of the pin. During the secondary injection molding process, the upper and lower ends of the Hall frame are tightly abutted with the mold cavity through small planes and positioning blocks, respectively, which not only ensures the accurate positioning of the sensing direction of the Hall chip, but also maintains the stability of the terminal structure.

[0008] The present invention is further configured such that the terminal includes a socket portion and a boss portion for covering the Hall frame, the socket portion being inclined to the boss portion, and the first bent portion and the pin extending into the socket portion.

[0009] Furthermore, a reinforcing rib is provided between the socket portion and the boss portion.

[0010] The above technical solution is adopted. The sealing cover is provided with a socket part and a boss part that are inclined to each other. The included angle between the two determines the wiring direction. The connection strength between the socket part and the sealing cover body is improved by the boss part and the reinforcing rib structure, and the vibration resistance and impact resistance of the socket part are improved.

[0011] The present invention is further configured such that the insert is a double-pin insert, a connecting part is provided between the inserts, and the second bending part is provided with an opening groove for punching the connecting part.

[0012] Using the above technical solution, the double-pin is punched and bent into shape as a whole. After the Hall frame is formed, an opening groove is left for the punching connection part, so that the pin is punched into two independent and parallel wiring pins.

[0013] The present invention is further configured such that the sealing cover has a circular part and a stepped part, the positioning ring is sleeved on the outside of the circular part, and the two ends of the positioning ring have extensions embedded in the circular part and the stepped part.

[0014] Using the above technical solution, the annular part is used to fit onto the connecting disc of the wheel hub bearing, and abuts against the end face of the connecting disc through the stepped part. The positioning ring is made of metal. By fitting the positioning ring on the outside of the annular part of the sealing cover and embedding its extension into the stepped part, the positioning ring is effectively prevented from falling off, and the structural strength of the annular part is improved.

[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 a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a perspective view of the Hall frame of this utility model before it is sealed with resin.

[0018] Figure 3This is a bottom view of the present invention;

[0019] Figure 4 For the present utility model Figure 1 A magnified view of the section at point A in the middle;

[0020] In the diagram: 1-Hall frame, 2-Pin, 3-Sealing cap, 4-Circuit board, 5-Positioning ring, 6-Resin layer, 11-Sensing groove, 12-Positioning block, 13-First bend, 14-Second bend, 15-Third bend, 16-Sensing part, 17-Small plane, 18-Opening groove, 21-Connecting part, 31-Terminal, 32-Rectangular part, 33-Socket part, 34-Boss part, 35-Reinforcing rib, 36-Circular ring part, 37-Step part, 51-Extension part; Detailed Implementation

[0021] like Figure 1 , 2 As shown, this embodiment provides a wheel speed sensor with multi-environment adaptability, including a Hall frame 1, a pin 2, a sealing cover 3, a circuit board 4, and a positioning ring 5. The Hall frame 1 has a pin 2 embedded inside it. A sensing groove 11 is provided on one side of the Hall frame 1. A circuit board 4 that is electrically connected to the pin 2 is installed in the sensing groove 11. A resin layer 6 for covering the circuit board 4 is provided at the opening of the sensing groove 11. Positioning blocks 12 for shaping are provided around the Hall frame 1. The upper and lower ends of the sealing cover are integrally injection molded based on the Hall frame 1 and the positioning ring 5, respectively. The sealing cover 3 and the pin 2 are combined to form a terminal 31.

[0022] Combination Figure 3 As shown, in this embodiment, the Hall frame 1 is provided with a first bent portion 13, a second bent portion 14, a third bent portion 15 and a sensing portion 16 connected in sequence. The sensing groove 11 is provided at the sensing portion 16. One end of the pin 2 extends into the sensing groove 11 by passing through the first bent portion 13, the second bent portion 14 and the third bent portion 15 in sequence. The sealing cover 3 is provided with a rectangular portion 32 for accommodating the sensing portion 16. The sensing portion 16 is provided with positioning blocks 12 that are coplanar with the surface of the rectangular portion 32 around its periphery. The first bent portion 13 is provided with a small plane 17 perpendicular to the direction of the terminal 31. The Hall frame 1 is integrally injection molded on the basis of the pin 2, and the first bent portion 13, the second bent portion 14, the third bent portion 15 and the sensing portion 16 are formed along the contour of the pin 2. During the secondary injection molding process, the upper and lower ends of the Hall frame 1 are tightly abutted against the mold cavity through the small plane 17 and the positioning block 12, respectively.

[0023] In this embodiment, the terminal 31 includes a socket portion 33 and a boss portion 34 for covering the Hall frame 1. The socket portion 33 is inclined to the boss portion 34. The first bend portion 13 and the pin 2 extend into the socket portion 33. A reinforcing rib 35 is provided between the socket portion 33 and the boss portion 34. The included angle between the socket portion 33 and the boss portion 34 determines the wiring orientation. The connection strength between the socket portion 33 and the main body of the sealing cover 3 is improved through the structure of the boss portion 34 and the reinforcing rib 35.

[0024] In this embodiment, the pin 2 is a double-pin pin 2, and a connecting part 21 is provided between the pins 2. The second bending part 14 is provided with an opening groove 18 for punching the connecting part 21. The double-pin pin 2 is integrally punched and bent. After the Hall frame 1 is formed, an opening groove 18 for punching the connecting part 21 is left, so that the pin 2 forms two independent and parallel wiring pins 2 after punching.

[0025] Combination Figure 4 As shown, in this embodiment, the sealing cover 3 is provided with a circular part 36 and a stepped part 37, and the positioning ring 5 is sleeved on the outside of the circular part 36. The two ends of the positioning ring 5 are provided with extensions 51 that are embedded in the circular part 36 and the stepped part 37.

[0026] The working principle of this utility model is as follows: the sealing cover 3 is coated with sealant at the positioning ring 5, and is sleeved on the connecting plate of the wheel hub bearing through the positioning ring 5, and abuts against the end face of the connecting plate through the step part 37. The signal teeth of the axle extend to the inner side of the ring part 36 and are close to the Hall chip on the circuit board 4. The SIGNAL end and VCC end of the double-pin 2 are connected to the ECU through the connecting wire. When the axle rotates, the magnetic field of the Hall chip 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.

[0027] 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 wheel speed sensor with multi-environment adaptability, characterized in that, The device includes a Hall frame (1), a pin (2), a sealing cap (3), a circuit board (4), and a positioning ring (5). The Hall frame (1) has a pin (2) embedded inside. A sensing groove (11) is provided on one side of the Hall frame (1). A circuit board (4) that is electrically connected to the pin (2) is installed in the sensing groove (11). A resin layer (6) for covering the circuit board (4) is provided at the opening of the sensing groove (11). Positioning blocks (12) for shaping are provided around the Hall frame (1). The upper and lower ends of the sealing cap are integrally injection molded based on the Hall frame (1) and the positioning ring (5), respectively. The sealing cap (3) and the pin (2) are combined to form a terminal (31).

2. The wheel speed sensor with multi-environment adaptability according to claim 1, characterized in that: The Hall frame (1) is provided with a first bend (13), a second bend (14), a third bend (15) and a sensing part (16) connected in sequence. The sensing groove (11) is provided at the sensing part (16). One end of the pin (2) passes through the first bend (13), the second bend (14) and the third bend (15) in sequence and extends into the sensing groove (11).

3. A wheel speed sensor with multi-environment adaptability according to claim 2, characterized in that: The sealing cover (3) is provided with a rectangular portion (32) for accommodating the sensing part (16). The sensing part (16) is provided with positioning blocks (12) that are coplanar with the surface of the rectangular portion (32). The first bending portion (13) is provided with a small plane (17) perpendicular to the direction of the wiring terminal (31).

4. A wheel speed sensor with multi-environment adaptability according to claim 3, characterized in that: The terminal (31) includes a socket portion (33) and a boss portion (34) for covering the Hall frame (1), the socket portion (33) being inclined toward the boss portion (34), and the first bend portion (13) and the pin (2) extending into the socket portion (33).

5. A wheel speed sensor with multi-environment adaptability according to claim 4, characterized in that: A reinforcing rib (35) is provided between the socket portion (33) and the boss portion (34).

6. A wheel speed sensor with multi-environment adaptability according to claim 2, characterized in that: The pin (2) is a double-legged pin (2), and a connecting part (21) is provided between the pins (2). The second bending part (14) is provided with an opening groove (18) for punching the connecting part (21).

7. A wheel speed sensor with multi-environment adaptability according to claim 2, characterized in that: The sealing cap (3) has an annular portion (36) and a stepped portion (37). The positioning ring (5) is sleeved on the outside of the annular portion (36). The two ends of the positioning ring (5) have extension portions (51) that are embedded in the annular portion (36) and the stepped portion (37).

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