阅读说明：本技术 车速传感器 (Vehicle speed sensor ) 是由 石坤举 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种车速传感器,包括壳体、安装在所述壳体一端的插接头以及安装在所述壳体内的磁石轴,所述壳体具有一腔体,所述腔体包括第一安装口和第二安装口,所述插接头由第一安装口装入所述腔体内,所述磁石轴由第二安装口装入所述腔体内,所述磁石轴包括轴杆、罩设连接在所述轴杆外的塑胶壳以及固定在所述塑胶壳的磁环,所述磁石轴与所述壳体之间设有套筒,所述套筒套在所述轴杆上,所述轴杆具有扩径段,所述套筒对应设有用于收容所述扩径段的收容槽,所述扩径段在所述收容槽内转动。本发明通过在轴杆设置扩径段,套筒对应设置收容槽,以对轴杆进行定位,防止轴杆轴向窜动。(The invention discloses a vehicle speed sensor which comprises a shell, a plug connector and a magnet shaft, wherein the plug connector is installed at one end of the shell, the magnet shaft is installed in the shell, the shell is provided with a cavity, the cavity comprises a first installation opening and a second installation opening, the plug connector is installed in the cavity through the first installation opening, the magnet shaft is installed in the cavity through the second installation opening, the magnet shaft comprises a shaft lever, a plastic shell and a magnetic ring, the plastic shell is connected to the outside of the shaft lever in a covering mode, the magnetic ring is fixed to the plastic shell, a sleeve is arranged between the magnet shaft and the shell and sleeved on the shaft lever, the shaft lever is provided with an expanding section, an accommodating groove used for accommodating the expanding section is correspondingly formed in the sleeve, and the expanding section rotates in the accommodating groove. According to the invention, the diameter expanding section is arranged on the shaft lever, and the containing grooves are correspondingly arranged on the sleeve to position the shaft lever, so that the axial movement of the shaft lever is prevented.)

1. A vehicle speed sensor characterized in that: the magnetic shaft comprises a shaft rod, a plastic shell and a magnetic ring, wherein the plastic shell is connected outside the shaft rod in a covering mode, the magnetic ring is fixed on the plastic shell, a sleeve is arranged between the magnetic shaft and the shell, the sleeve is sleeved on the shaft rod, the shaft rod is provided with an expanding section, the sleeve is correspondingly provided with an accommodating groove used for accommodating the expanding section, and the expanding section rotates in the accommodating groove.

2. The vehicle speed sensor according to claim 1, characterized in that: a first sealing ring is arranged between the plug connector and the shell, and paraffin is fused at the external connection part of the plug connector and the shell.

3. The vehicle speed sensor according to claim 2, characterized in that: and a second sealing ring is arranged between the shaft lever and the plastic shell, and a third sealing ring is arranged between the plastic shell and the shell.

4. The vehicle speed sensor according to claim 1, characterized in that: the inner wall of the cavity is provided with a first clamping step, the surface of the first clamping step is inwards concave to be provided with a groove, one end of the plug connector, facing the cavity, is provided with a convex ring, the plug connector is externally provided with external threads, the inner wall of the cavity, close to the first mounting port, is provided with internal threads, the plug connector is in threaded fixation with the cavity, and the convex ring is positioned and installed in the groove.

5. The vehicle speed sensor according to claim 4, characterized in that: the inner wall of the cavity is further provided with a second clamping step, the lower end of the plastic shell extends outwards to form an extending part, and the extending part is abutted to the second clamping step.

6. The vehicle speed sensor according to claim 1, characterized in that: the magnetic ring is opposite to the PCB, and a gap is reserved between the magnetic ring and the PCB.

Technical Field

The invention relates to the field of sensors for testing speed for automobiles, in particular to a vehicle speed sensor.

Background

The speed sensor is a speed measuring device, is widely applied to automobiles and provides speed signals for automobile indicating instruments. The vehicle speed sensor includes a plug and a main body case. Wherein, be equipped with the PCB board in the bayonet joint, and be provided with induction element promptly hall device on the PCB board. In a position opposite to the hall device, a magnet shaft is provided. The magnet shaft is arranged in the main body shell, and one end of the magnet shaft is provided with a gear which can be fixedly connected with an output gear in the gearbox.

At present, in various vehicle speed sensors applied to the market, magnet shafts of some vehicle speed sensors adopt split structures, magnetic rings and shaft rods are easy to deviate, and the mechanical transmission effect is poor.

Disclosure of Invention

The invention aims to solve the problems that an existing magnetic ring and a shaft lever are easy to deviate and poor in mechanical transmission effect, and provides a vehicle speed sensor.

In order to achieve the purpose, the invention adopts the following technical scheme: a vehicle speed sensor comprises a shell, a plug-in connector mounted at one end of the shell and a magnet shaft mounted in the shell, wherein the shell is provided with a cavity, the cavity comprises a first mounting opening and a second mounting opening, the plug-in connector is mounted in the cavity through the first mounting opening, the magnet shaft is mounted in the cavity through the second mounting opening, the magnet shaft comprises a shaft rod, a plastic shell and a magnetic ring, the plastic shell is connected to the outside of the shaft rod in a covering mode, the magnetic ring is fixed to the plastic shell, a sleeve is arranged between the magnet shaft and the shell and sleeved on the shaft rod, the shaft rod is provided with an expanding section, an accommodating groove used for accommodating the expanding section is correspondingly arranged in the sleeve, and the expanding section rotates in the accommodating groove.

A first sealing ring is arranged between the plug connector and the shell, and paraffin is fused at the external connection part of the plug connector and the shell.

And a second sealing ring is arranged between the shaft lever and the plastic shell, and a third sealing ring is arranged between the plastic shell and the shell.

The inner wall of the cavity is provided with a first clamping step, the surface of the first clamping step is inwards concave to be provided with a groove, one end of the plug connector, facing the cavity, is provided with a convex ring, the plug connector is externally provided with external threads, the inner wall of the cavity, close to the first mounting port, is provided with internal threads, the plug connector is in threaded fixation with the cavity, and the convex ring is positioned and installed in the groove.

The inner wall of the cavity is further provided with a second clamping step, the lower end of the plastic shell extends outwards to form an extending part, and the extending part is abutted to the second clamping step.

The magnetic ring is opposite to the PCB, and a gap is reserved between the magnetic ring and the PCB.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that: through set up the hole enlargement section at the axostylus axostyle, the sleeve corresponds sets up the accepting groove to fix a position the axostylus axostyle, prevent axostylus axostyle axial float.

Drawings

FIG. 1 is a cross-sectional view of a vehicle speed sensor of the present invention;

FIG. 2 is a schematic structural diagram of the housing and the sleeve according to the present invention;

fig. 3 is an enlarged schematic view of a portion a in fig. 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 3, the present invention is a vehicle speed sensor including a housing 1, a plug 2 mounted at one end of the housing 1, and a magnet shaft 3 mounted in the housing 1.

Referring to fig. 2, the housing 1 has a cavity 11, the cavity 11 includes a first mounting opening 111 and a second mounting opening 112, the plug 2 is installed in the cavity 11 through the first mounting opening 111, the inner wall of the cavity 11 is provided with a first clamping step 12, a groove 121 is formed in the surface of the first clamping step 12 in a concave manner, referring to fig. 3, one end of the plug 2 facing the cavity 11 is provided with a convex ring 21, the plug 2 is externally provided with an external thread, the inner wall of the cavity 11 close to the first mounting opening 11 is provided with an internal thread, the plug 2 is fixed with the cavity 11 through a thread, and the convex ring 21 is positioned and installed in the groove 121, thereby facilitating the positioning and installation of the plug 2.

In addition, a first seal ring 4 is provided between the plug 2 and the housing 1 to improve the sealing property. The paraffin 5 is melted at the external connection part of the plug connector 2 and the shell 1, so that the water-tight performance of the connection part of the plug connector and the shell is improved, and the paraffin 5 is convenient to remove and use.

Referring to fig. 1, the magnet shaft 3 is installed in the cavity 11 through the second installation opening 112, the inner wall of the cavity 11 is further provided with a second clamping step 13, the magnet shaft 3 includes a shaft rod 31, a plastic shell 32 covering the shaft rod 31 and connected to the outside of the plastic shell 32, and a magnetic ring 33 fixed on the plastic shell 32, the lower end of the plastic shell 32 extends outwards to form an extension portion 321, and the extension portion 321 abuts against the second clamping table 13. The socket connector 2 is internally provided with a PCB 22 and a connecting terminal 23 connected with the PCB 22, the magnetic ring 33 is opposite to the PCB 22, and a gap is reserved between the magnetic ring 33 and the PCB 22.

The PCB 22 is provided with an induction device, the magnetic ring 33 rotates along with the shaft rod 31, the magnetic ring 33 rotates for a circle, and the induction device correspondingly generates a pulse signal. By receiving the pulse signal sent by the vehicle speed sensor, the vehicle speed and the mileage can be calculated.

Referring to fig. 1, a second seal ring 6 is arranged between the shaft rod 31 and the plastic shell 32, a third seal ring 7 is arranged between the plastic shell 32 and the housing 1, and the first seal ring 4, the second seal ring 6 and the third seal ring 7 are all 0-shaped seal rings.

Referring to fig. 1, a sleeve 8 is disposed between the magnet shaft 3 and the housing 1, the sleeve 8 is sleeved on the shaft 31, the shaft 31 has a diameter-expanding section 311, the diameter of the diameter-expanding section 311 is larger than the diameter of the other part of the shaft 31, referring to fig. 2, the sleeve 8 is correspondingly provided with a receiving groove 81 for receiving the diameter-expanding section 311, the diameter-expanding section 311 rotates in the receiving groove 81, the diameter-expanding section 311 is disposed on the shaft 31, and the sleeve 8 is correspondingly provided with the receiving groove 81 to position the shaft 31, so as to prevent the shaft 31 from moving axially.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.