Dustproof and waterproof structure of speed sensor

Abstract

The utility model discloses a dustproof and waterproof structure of a speed sensor, which comprises an outer shell, a Hall element, a magnet, a wire harness plug and a circuit module are arranged in the outer shell, and a reinforcing assembly is arranged on the inner wall of the outer shell; one side of the outer shell is in threaded connection with a bolt, one end of the bolt is sleeved with a first sealing ring and a second sealing ring, a wire harness plug is inserted into the bolt, one side of the wire harness plug is connected with a circuit module, the other side of the wire harness plug is provided with a base, one side of the first sealing ring is provided with the second sealing ring, and the other side of the second sealing ring is provided with the base. The first sealing ring and the second sealing ring are located between the inner wall of the outer shell and the outer wall of the bolt, a low-pressure injection molding body is arranged in the outer shell in an injection molding mode, and the Hall element, the magnet, the wire harness plug and the circuit module are wrapped in a sealed mode through the low-pressure injection molding body. The device adopts a low-pressure injection molding process structure, the dustproof and waterproof requirements are met, meanwhile, the process flow is simplified, processes such as glue filling and curing are not needed, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of speed sensors, in particular to a dustproof and waterproof structure of a speed sensor. Background Art

[0002] The increment of displacement per unit time is velocity. Velocity includes linear velocity and angular velocity. Corresponding to them are linear velocity sensors and angular velocity sensors, which we collectively call velocity sensors.

[0003] Speed sensors are widely used in the automotive field. However, in order to meet the requirements of dust and water resistance, speed sensors are currently mostly sealed with glue. Under high temperature conditions, this method may cause water to enter the sensor due to cracking and softening of the glue, which may lead to sensor failure and affect the overall service life of the sensor. Improvements are needed. Utility Model Content

[0004] The purpose of the utility model is to provide a dustproof and waterproof structure of a speed sensor, so as to solve the problem in the prior art that the existing speed sensor sealed by glue is prone to cracking and damage, resulting in water ingress.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a dustproof and waterproof structure of a speed sensor, comprising an outer shell, wherein a Hall element, a magnet, a wiring harness connector and a circuit module are arranged inside the outer shell, and a low-pressure injection molded body is injection-molded inside the outer shell, which seals and wraps the Hall element, magnet, wiring harness connector and circuit module.

[0006] Preferably, a bolt is threadedly connected to one side of the outer shell, and a first sealing ring and a second sealing ring are sleeved on one end of the bolt.

[0007] Preferably, a second sealing ring is provided on one side of the first sealing ring, and the first sealing ring and the second sealing ring are located between the inner wall of the housing and the outer wall of the bolt.

[0008] Preferably, a wiring harness connector is inserted into the bolt, one side of the wiring harness connector is connected to the circuit module, and the other side of the wiring harness connector is provided with a base.

[0009] Preferably, the inner wall of the outer shell is provided with a reinforcement component;

[0010] The reinforcement assembly includes reinforcement ribs fixed on the inner wall of the outer shell. A plurality of reinforcement ribs are arranged on the inner wall of the outer shell, and each group has a plurality of reinforcement ribs distributed at equal intervals laterally on the inner wall of the outer shell.

[0011] Preferably, the reinforcing rib is in a right-angled "U" structure when viewed from the side, a through hole is provided at the bottom of the reinforcing rib, and the reinforcing rib fits tightly against the outer wall of the low-pressure injection molding body.

[0012] Preferably, the inner wall of the reinforcing rib is fixedly connected with a supporting rib, and the supporting rib is in an inverted "V" shape.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] (1) This device adopts a low-pressure injection molding process structure to meet the requirements of dust and water resistance. At the same time, it simplifies the process flow and eliminates the need for glue filling, curing and other processes, thereby improving production efficiency.

[0015] (2) This device integrates the Hall element, magnet, wiring harness connector and circuit module into an integrated structure through low-pressure injection molding, which not only plays an effective waterproof role but also plays a dust-proof role, thereby improving the service life of the Hall element, magnet, wiring harness connector and circuit module.

[0016] (3) This device provides reinforcing ribs between the outer shell and the low-pressure injection molding body, and uses the reinforcing ribs to support the outer shell to improve the outer shell's anti-deformation ability and avoid deformation and damage to the outer shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the dustproof and waterproof structure of a speed sensor of the utility model;

[0018] Figure 2 This is a cross-sectional view of a dustproof and waterproof structure of a speed sensor according to the present invention;

[0019] Figure 3 This is a side view of the reinforcement ribs of the dustproof and waterproof structure of a speed sensor according to the utility model.

[0020] In the figure: 1. outer shell; 2. bolt; 3. wiring harness connector; 4. base; 5. Hall element; 6. magnet; 7. circuit module; 8. low-pressure injection molding body; 9. first sealing ring; 10. second sealing ring; 11. reinforcement assembly; 111. reinforcement rib; 112. support rib. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-3The utility model provides a technical solution: a dustproof and waterproof structure of a speed sensor, comprising an outer shell 1, a Hall element 5, a magnet 6 and a circuit module 7 are arranged inside the outer shell 1, a bolt 2 is threadedly connected to one side of the outer shell 1, and one end of the bolt 2 is sleeved with a first sealing ring 9 and a second sealing ring 10; a second sealing ring 10 is arranged on one side of the first sealing ring 9, and the first sealing ring 9 and the second sealing ring 10 are located between the inner wall of the outer shell 1 and the outer wall of the bolt 2; the first sealing ring 9 and the second sealing ring 10 of this structure can play a secondary sealing role in the connection between the outer shell 1 and the bolt 2 to improve the sealing performance; a wiring harness connector 3 is inserted on the bolt 2, one side of the wiring harness connector 3 is connected to the circuit module 7, and the other side of the wiring harness connector 3 is provided with a base 4; this structure is connected to the power supply through the wiring harness connector 3; the bolt 2 of this device can adjust the depth of the connection with the outer shell 1 by rotating; the circuit module 7 is welded to the wiring harness connector 3; the inner wall of the outer shell 1 is provided with a reinforcement component 11;

[0023] The reinforcement assembly 11 includes a reinforcement rib 111 fixed to the inner wall of the outer shell 1. There are multiple groups of reinforcement ribs 111 on the inner wall of the outer shell 1, and each group has multiple reinforcement ribs distributed at equal intervals laterally on the inner wall of the outer shell 1; the reinforcement rib 111 is a right-angled "U" structure when viewed from the side, and a through hole is opened at the bottom of the reinforcement rib 111. The reinforcement rib 111 is tightly fitted with the outer wall of the low-pressure injection molded body 8; the through hole of the reinforcement rib 111 of this structure is used for heat dissipation and ventilation of the low-pressure injection molded body 8; the inner wall of the reinforcement rib 111 is fixedly connected to the support rib 112, and the support rib 112 is an inverted "V" structure ; This structure can support the outer shell 1 through the reinforcing ribs 111 and the supporting ribs 112, thereby improving the outer shell 1's ability to resist deformation; a low-pressure injection molded body 8 is injection-molded inside the outer shell 1, and the low-pressure injection molded body 8 seals and wraps the Hall element 5, the magnet 6 and the circuit module 7; the magnet 6 is connected to the circuit module 7 by adhesive; the Hall element 5 is attached to the circuit module 7 by SMT technology; the material of the low-pressure injection molded body 8 of this device can be: polyamide, polyolefin or polyurethane hot melt adhesive, and the specific material can be selected according to actual conditions.

[0024] Working principle: When using the dustproof and waterproof structure of the speed sensor, first assemble the Hall element 5, magnet 6, wiring harness connector 3 and circuit module 7 and use the low-pressure injection molding process to make the low-pressure injection molding body 8 injection-molded and wrapped with the Hall element 5, magnet 6, wiring harness connector 3 and circuit module 7 to form an integrated structure. Then, the Hall element 5, magnet 6, wiring harness connector 3 and circuit module 7 are installed and sealed inside the outer shell 1 through the bolts 2. During the use of this device, the reinforcing ribs 111 and the supporting ribs 112 are supported between the outer wall and the inner wall of the outer shell 1, thereby supporting the outer shell 1, avoiding deformation of the outer shell 1, and improving the service life of the outer shell 1.

[0025] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dustproof and waterproof structure of a speed sensor, comprising an outer shell (1), characterized in that: The outer shell (1) is provided with a Hall element (5), a magnet (6), a wiring harness connector (3) and a circuit module (7). A low-pressure injection molding body (8) is injection-molded inside the outer shell (1), and the low-pressure injection molding body (8) seals and wraps the Hall element (5), the magnet (6), the wiring harness connector (3) and the circuit module (7).

2. The dustproof and waterproof structure of a speed sensor according to claim 1, characterized in that: One side of the outer shell (1) is threadedly connected to a bolt (2), and one end of the bolt (2) is sleeved with a first sealing ring (9) and a second sealing ring (10).

3. The dustproof and waterproof structure of a speed sensor according to claim 2, characterized in that: A second sealing ring (10) is provided on one side of the first sealing ring (9), and the first sealing ring (9) and the second sealing ring (10) are located between the inner wall of the outer shell (1) and the outer wall of the bolt (2).

4. The dustproof and waterproof structure of a speed sensor according to claim 2, characterized in that: A wiring harness connector (3) is inserted into the bolt (2), one side of the wiring harness connector (3) is connected to a circuit module (7), and the other side of the wiring harness connector (3) is provided with a base (4).

5. The dustproof and waterproof structure of a speed sensor according to claim 1, characterized in that: The inner wall of the outer shell (1) is provided with a reinforcement component (11); The reinforcing assembly (11) comprises reinforcing ribs (111) fixed to the inner wall of the outer shell (1). The reinforcing ribs (111) are provided in multiple groups with respect to the inner wall of the outer shell (1), and each group has multiple reinforcing ribs distributed at equal intervals laterally on the inner wall of the outer shell (1).

6. The dustproof and waterproof structure of a speed sensor according to claim 5, characterized in that: The reinforcing rib (111) is in a right-angled "U" structure when viewed from the side, a through hole is provided at the bottom of the reinforcing rib (111), and the reinforcing rib (111) is tightly fitted to the outer wall of the low-pressure injection molding body (8).

7. The dustproof and waterproof structure of a speed sensor according to claim 5, characterized in that: The inner wall of the reinforcing rib (111) is fixedly connected with a supporting rib (112), and the supporting rib (112) is in an inverted "V"-shaped structure.

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