CN214893436U

CN214893436U - Crankshaft position and rotating speed sensor

Info

Publication number: CN214893436U
Application number: CN202121449280.6U
Authority: CN
Inventors: 王亮
Original assignee: Shanghai Haihua Sensor Co ltd
Current assignee: Shanghai Haihua Sensor Co ltd
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2021-11-26
Anticipated expiration: 2031-06-28

Abstract

The utility model discloses a crankshaft position revolution speed transducer belongs to automobile engine technical field. The magnetic protection device comprises a PIN needle, a Hall chip, a magnetic distribution magnetic steel, a first protection shell and a second protection shell; the outside of the PIN needle is formed into a first protective shell through injection molding; the bottom of the first protection shell is provided with a groove, and the magnetic distribution magnetic steel is clamped in the groove; the Hall chip is arranged at the bottom end of the first protective shell; the second protection shell is a cylindrical shell with an open top end; and a sealing ring groove is formed in the outer side of the second protective shell, and a sealing ring is arranged in the sealing ring groove. The Hall chip and the PIN in the first protective shell adopt a metal melting welding process, so that the sensor is prevented from being invalid due to the fact that soldering tin is melted and separated under the condition of extreme high temperature; first protection casing and second protection casing assemble through the assembly mode, avoid forming high temperature to the hall chip and strike, avoid causing the damage to hall chip itself, promote the yield.

Description

Crankshaft position and rotating speed sensor

Technical Field

The utility model relates to a crankshaft position revolution speed transducer belongs to automobile engine technical field.

Background

The function of the crankshaft position rotational speed sensor is to determine the position of the crankshaft, i.e. the rotational angle of the crankshaft and the engine speed.

In the prior art, the magnetic steel is made of alnico, the magnetic field intensity is greatly influenced by temperature, and particularly, the magnetic field attenuation phenomenon exists under the high-temperature condition, so that the output of a crankshaft position rotating speed sensor is unstable; the Hall chip and the PIN needle in the protective shell are welded through tin soldering, and the solder is melted at a high temperature limit to form a cold solder, so that the sensor is invalid; the Hall chip and the protective shell form a whole through an injection molding process, and in the process of implementing the process, the Hall chip bears high-temperature impact during injection molding, so that the Hall chip is easily damaged, and the finished product rate is low. The automobile crankcase is internally provided with a gear structure, and the clearance of the gear structure is precise. Because the crankshaft position rotating speed sensor senses the rotating state of the gear through the Hall chip to measure the rotating speed, the clearance between the sensor and the gear needs to be strictly controlled.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve lies in: the utility model provides a crankshaft position rotational speed sensor, it has solved among the prior art problem that the sensor is easy to lose efficacy when using, yield is low during production.

The utility model discloses the technical problem that will solve takes following technical scheme to realize:

a crankshaft position and rotation speed sensor comprises a PIN needle, a Hall chip, a magnetic distribution magnetic steel, a first protection shell and a second protection shell;

the outer part of the PIN needle is formed into a first protective shell through injection molding, the PIN needle is arranged inside the first protective shell, a connecting cavity is formed in the top of the first protective shell, and the upper end of the PIN needle is exposed in the connecting cavity;

the bottom of the first protection shell is provided with a groove, and the magnetic distribution magnetic steel is clamped in the groove;

the Hall chip is arranged at the bottom end of the first protective shell and connected with the lower end of the PIN needle through a metal melting welding process;

the second protection shell is a cylindrical shell with an opening at the top end, the first protection shell is inserted into the second protection shell, and one end provided with the Hall chip is arranged close to the bottom end of the second protection shell;

and a sealing ring groove is formed in the outer side of the second protective shell, and a sealing ring is arranged in the sealing ring groove.

Preferably, the inner space of the second protection shell where the hall chip and the magnetic distribution magnetic steel are located is filled with sealing glue.

Preferably, a hot spot is arranged on the outer side of the top of the second protection shell and used for fixing the first protection shell and the second protection shell in a hot mode.

The utility model has the advantages that:

(1) the Hall chip and the PIN in the first protective shell adopt a metal melting welding process, so that the sensor is prevented from being invalid due to the fact that soldering tin is melted and separated under the condition of extreme high temperature;

(2) the first protection shell and the second protection shell are assembled in an assembling mode, so that high-temperature impact on the Hall chip is avoided, damage to the Hall chip is avoided, and the rate of finished products is improved;

(3) the second protective shell is filled with sealing glue to isolate the Hall chip and the internal electrical connecting piece from the external environment;

(4) after the first protection shell and the second protection shell are assembled, a blanching process is applied to the second protection shell, so that the relative positions of the first protection shell and the second protection shell are fixed, the displacement does not occur, and the gear gap between the sensor and the crankshaft position is ensured.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a left side view of the present invention.

Fig. 3 is a top view of the present invention.

Fig. 4 is a sectional view taken along line C-C of fig. 1.

Fig. 5 is a sectional view taken along line D-D in fig. 4.

In the figure: 1. a PIN needle; 2. a Hall chip; 3. magnetic steel is matched; 4. a first protective housing; 5. a second protective housing; 51. blanching a spot location; 6. and (5) sealing rings.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand and understand, the present invention is further explained by combining the following specific drawings.

The first embodiment is as follows:

referring to fig. 1-5, the present embodiment provides a crankshaft position and rotation speed sensor, which includes a PIN 1, a hall chip 2, a magnetic steel 3, a first protective casing 4, and a second protective casing 5; the Hall chip 2 is used for outputting a position signal; the magnetic distribution magnetic steel 3 is used for providing the magnetic field intensity required by the Hall chip 2;

the outer part of the PIN needle 1 is formed into a first protective shell 4 through injection molding, the PIN needle 1 is arranged inside the first protective shell 4, a connecting cavity is formed in the top of the first protective shell 4, and the upper end of the PIN needle 1 is exposed in the connecting cavity; the PIN needle 1 is protected through the connecting cavity, so that the PIN needle 1 is prevented from being directly exposed outside, and the PIN needle 1 is prevented from being bent and deformed due to collision, so that the PIN needle 1 cannot be normally connected for use, and the whole sensor is scrapped;

a groove is formed in the bottom of the first protection shell 4, the magnetism distribution magnetic steel 3 is clamped in the groove, the magnetism distribution magnetic steel 3 is limited, and the influence on the measurement accuracy caused by displacement caused by shaking is avoided;

the Hall chip 2 is arranged at the bottom end of the first protective shell 4, the Hall chip 2 is connected and conducted with the lower end of the PIN needle 1 through a metal melting welding process, and a speed signal acquired by the Hall chip 2 is sent to external equipment through an inserting piece;

the second protective shell 5 is a cylindrical shell with an open top end, the first protective shell 4 is inserted into the second protective shell 5, and one end provided with the Hall chip 2 is arranged close to the bottom end of the second protective shell 5; the second protective shell 5 is used for protecting the Hall chip 2 inside and controlling the air gap between the measuring surface of the Hall chip 2 and the target signal panel;

the outside of second protection casing 5 is equipped with the seal ring groove, is equipped with sealing washer 6 in the seal ring groove, and the material of sealing washer 6 adopts rubber for make sealed between crankshaft position sensor and the installation cylinder body, and after crankshaft position rotational speed sensor through repeated dismouting, also can guarantee its leakproofness.

Example two:

referring to fig. 1-5, the present embodiment provides a crankshaft position and rotation speed sensor, which includes a PIN 1, a hall chip 2, a magnetic steel 3, a first protective casing 4, and a second protective casing 5;

the inner space of the second protective shell 5 where the Hall chip 2 and the magnetic steel 3 are located is filled with sealing glue, so that the Hall chip 2 and the internal electric connecting piece are isolated from the external environment. The other structure is the same as the first embodiment.

Example three:

the top outside of second protection casing 5 is equipped with the blanching position 51 for it is fixed with second protection casing 5 blanching to make first protection casing 4, avoids causing the damage to hall chip 2 itself, promotes the yield. The other structure is the same as the first embodiment.

The utility model provides a pair of crankshaft position revolution speed sensor's equipment mode as follows:

firstly, a first protective shell 4 is formed outside the PIN needle 1 through injection molding, the PIN needle 1 and the first protective shell 4 are integrated, and the PIN needle 1 is arranged inside the first protective shell 4; then, a Hall chip 2 is installed at the bottom end of the first protective shell 4, and metal melting is adopted at the contact position of the Hall chip 2 and the PIN needle 1, so that the Hall chip 2 is conducted with the PIN needle 1; then, a magnetic distribution magnetic steel 3 is arranged in a groove of the first protective shell 4 above the Hall chip 2; then, filling sealing glue in the second protective shell 5; then, inserting the first protective shell 4 provided with the Hall chip 2 and the magnetism distribution magnetic steel 3 into the sealant water in the second protective shell 5 to ensure that the Hall chip 2 and the magnetism distribution magnetic steel 3 are completely immersed in the sealant water; then, blanching at a blanching point 51 of the second protective shell 5 to fix the positions of the first protective shell 4 and the second protective shell 5; finally, a rubber seal ring 6 is fitted in the seal ring groove on the outer side of the second protective case 5.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are intended to be included within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A crankshaft position and rotation speed sensor is characterized by comprising a PIN needle, a Hall chip, a magnetic distribution magnetic steel, a first protective shell and a second protective shell;

2. The crankshaft position and rotation speed sensor according to claim 1, wherein a sealing glue is filled in an inner space of the second protective shell where the hall chip and the magnetic distribution magnetic steel are located.

3. The crankshaft position and rotation speed sensor according to claim 1, wherein a hot spot position is arranged on the outer side of the top of the second protection shell.