CN108535508A - A kind of Full-shielding automobile wheel speed sensor - Google Patents
A kind of Full-shielding automobile wheel speed sensor Download PDFInfo
- Publication number
- CN108535508A CN108535508A CN201810279653.6A CN201810279653A CN108535508A CN 108535508 A CN108535508 A CN 108535508A CN 201810279653 A CN201810279653 A CN 201810279653A CN 108535508 A CN108535508 A CN 108535508A
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- Prior art keywords
- shell
- sensor
- wheel speed
- heat
- mounting bracket
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
Abstract
The invention discloses a kind of Full-shielding automobile wheel speed sensors,Including shell,The top of the shell is fixed with fixed arm,And the bottom of enclosure is provided with nano electromagnetic shielded layer,The fixed arm is provided with pressing fixed blocks relative to one end of shell,And the top of pressing fixed blocks is connected with fixing sleeve,The fixed arm offers connecting hole relative to the side of pressing fixed blocks,And the both ends of connecting hole are both provided with locking latch,The middle position of the enclosure is equipped with mounting bracket,And the inner wall both sides of shell are both provided with heat-conducting plate,It is both provided with filled layer between the mounting bracket and two heat-conducting plates,The present invention is provided with locking latch and connecting hole,Realize being fixedly secured for sensor,Prevent sensor installation from loosely loosening,Ensure the stable detection of sensor,Improve the accuracy of sensor detection,Provided with heat-conducting plate,Realize sensor high efficiency and heat radiation,Extend the service life of sensor.
Description
Technical field
The invention belongs to technical field of automobile components, and in particular to a kind of Full-shielding automobile wheel speed sensor.
Background technology
Wheel speed sensors are the sensors for measuring automotive wheel rotating speed, and for Hyundai Motor, wheel speed information is
It is essential, automobile kinetic-control system (VDC), electronic stability program of automobile (ESP), anti-lock braking system (ABS), from
The control system etc. of dynamic speed changer is required for wheel speed information, so wheel speed sensors are sensors the most key in Hyundai Motor
One of, and wheel speed sensors are broadly divided into the magneto-electric type wheel speed sensor using electromagnetic induction principle and utilize Hall effect principle
Hall wheel speed sensor.
But Full-shielding automobile wheel speed sensor currently on the market still has certain defect, example in use
Such as, sensor installation loosely, be easy to happen loosening, influence the accuracy of detection of sensor, in addition, sensor work long hours it is easy
Heat is generated, heat dissipation performance is poor, and component high temperature is caused to damage.
Invention content
The purpose of the present invention is to provide a kind of Full-shielding automobile wheel speed sensors, to solve to propose in above-mentioned background technology
Sensor installation loosely, be easy to happen loosening, influence the accuracy of detection of sensor, in addition, sensor work long hours it is easy
Generate heat, heat dissipation performance is poor, cause component high temperature damage the problem of.
To achieve the above object, the present invention provides the following technical solutions：A kind of Full-shielding automobile wheel speed sensor, including it is outer
The top of shell, the shell is fixed with fixed arm, and the bottom of enclosure is provided with nano electromagnetic shielded layer, the fixed arm
One end relative to shell is provided with pressing fixed blocks, and the top of pressing fixed blocks is connected with fixing sleeve, and the fixed arm is relative to pressing
The side of block offers connecting hole, and the both ends of connecting hole are both provided with locking latch, the middle position of the enclosure
Mounting bracket is installed, and the inner wall both sides of shell are both provided with heat-conducting plate, are respectively provided between the mounting bracket and two heat-conducting plates
There is filled layer, and the top inside mounting bracket is provided with permanent magnet, the middle position of the permanent magnet bottom end is equipped with magnetic core,
And the bottom end of magnetic core is connected with polar axis, the outside of the mounting bracket lower semisection is arranged with induction coil, and mounting bracket inner upper
Symmetrically running through at two side positions of magnetic core has the electrode pin connected by conducting wire.
Preferably, the inside of two heat-conducting plates is both provided with thermal conductive material layer.
Preferably, the fixing sleeve is a kind of hollow cylinder shape structure.
Preferably, the diameter of section of the pressing fixed blocks is more than the diameter of section of fixing sleeve.
Preferably, the pressing fixed blocks are fixedly connected with fixed arm by fixed seat.
Compared with prior art, the beneficial effects of the invention are as follows：
（1）The present invention is provided with locking latch and connecting hole, and when in use, sensor is first passed through the company on fixed arm by user
Hole is connect on automotive hub, and is fixed togather with external fixation device by the locking latch at connecting hole both ends, in turn
It realizes being fixedly secured for sensor, prevents sensor installation from loosely loosening, ensure the stable detection of sensor, improve sensing
The accuracy of device detection.
（2）The present invention is provided with heat-conducting plate, during working sensor, outer casing inner wall both sides in the inner wall both sides of shell
Heat-conducting plate by enclosure component working when the heat that generates conduct to shell, and pass through outer shell outer wall and contacting external air
Heat is distributed, achievees the purpose that heat dissipation, extends the service life of sensor.
Description of the drawings
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the outside drawing of the present invention；
Fig. 3 is the vertical view of the present invention；
In figure：1- fixed arms；2- locks latch；3- fixing sleeves；4- pressing fixed blocks；5- electrode pins；6- heat-conducting plates；7- magnetic cores；8-
Shell；9- induction coils；10- polar axis；11- nano electromagnetic shielded layers；12- mounting brackets；13- filled layers；14- connecting holes；15- is forever
Magnet.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
- 3 are please referred to Fig.1, the present invention provides a kind of technical solution：A kind of Full-shielding automobile wheel speed sensor, including shell
8, the top of the shell 8 is fixed with fixed arm 1, and the bottom inside shell 8 is provided with nano electromagnetic shielded layer 11, nanometer electricity
Magnetic masking layer 11 can effectively shield extraneous electromagnetic interference, ensure that the accuracy of sensor detection, the fixed arm 1 are opposite
One end of shell 8 is provided with pressing fixed blocks 4, and the top of pressing fixed blocks 4 is connected with fixing sleeve 3, the fixed arm 1 is relative to pressing
The side of block 4 offers connecting hole 14, and the both ends of connecting hole 14 are both provided with locking latch 2, by locking setting for latch 2
It sets, sensor can be matched with external fixation device, realize being fixedly secured for sensor, prevent sensor from loosening, it is described
Middle position inside shell 8 is equipped with mounting bracket 12, and the inner wall both sides of shell 8 are both provided with heat-conducting plate 6, heat-conducting plate 6
The heat generated when 8 internal part of shell can work is conducted to shell 8, and passes through 8 outer wall of shell and contacting external air
Heat is distributed, achievees the purpose that heat dissipation, filled layer 13 is both provided between the mounting bracket 12 and two heat-conducting plates 6, and pacify
It shelves the top inside 12 and is provided with permanent magnet 15, the middle position of 15 bottom end of the permanent magnet is equipped with magnetic core 7, and magnetic core
7 bottom end is connected with polar axis 10, and the outside of 12 lower semisection of the mounting bracket is arranged with induction coil 9, and on 12 inside of mounting bracket
Side is symmetrically run through at two side positions of magnetic core 7 electrode pin 5 connected by conducting wire.
For the ease of 8 internal heat dissipating of shell, in the present embodiment, it is preferred that the inside of two heat-conducting plates 6 is both provided with
Thermal conductive material layer.
For the ease of fixed output lead, in the present embodiment, it is preferred that the fixing sleeve 3 is a kind of hollow cylinder shape knot
Structure.
Output lead falls off in order to prevent, in the present embodiment, it is preferred that the diameter of section of the pressing fixed blocks 4, which is more than, to be fixed
The diameter of section of set 3.
In order to realize being fixedly secured for pressing fixed blocks 4, in the present embodiment, it is preferred that the pressing fixed blocks 4 pass through with fixed arm 1
Fixed seat is fixedly connected.
Operation principle：In the use of the present invention, sensor is first mounted on by user by the connecting hole 14 on fixed arm 1
It on automotive hub, and is fixed togather with external fixation device by the locking latch 2 at 14 both ends of connecting hole, and then realizes sensing
Device is fixedly secured, and is prevented sensor installation from loosely loosening, is ensured the stable detection of sensor, and sensor detection is improved
Accuracy, then sensor is connected by conducting wire and exterior terminal, after installation is complete, the magnetic line of force is discharged from a pole of magnetic core 7
Out, across gear ring, air and around the induction coil 9 being located on mounting bracket 12, another pole of magnetic core 7 is returned to, automobile is worked as
When driving, wheel rotates, and the gear ring of the sensor on wheel hub is rotated with vehicle wheel rotation, the tooth on gear ring and gap
The magnetic field that sensor internal is generated by magnetic core 7, polar axis 10 and permanent magnet 15 is moved quickly through successively, and the magnetic resistance of magnetic circuit in magnetic field is made to send out
It is raw to change, to make the induced potential in induction coil 9 change therewith, and certain amplitude, the potential pulse of frequency are generated,
The pulse number that i.e. each second generates reflects the speed of wheel rotation, and electrode pin 5 is by the potential of certain amplitude, frequency
Pulse is transferred to exterior terminal by conducting wire, and then achievees the purpose that detect automotive wheel rotating speed, during working sensor,
Nano electromagnetic shielded layer 11 effectively shields extraneous electromagnetic interference, ensures the accuracy of sensor detection, 8 inner wall both sides of shell
The heat that generates when 8 internal part of shell works of heat-conducting plate 6 conduct to shell 8, and pass through 8 outer wall of shell and outside air
Contact distributes heat, achievees the purpose that heat dissipation.
The nano electromagnetic shielded layer 11 is prepared using composite Nano electromagnetic shielding material, using temperature-pressure
Mode curing molding final sample, it is not simple complex superposition that magnetic particle, which is added, improves the magnetic conductivity of material simultaneously to first
Begin to carry out magnetic screen again into the leakage magnetic of magnetic shield, to make the leakage magnetic flux by magnetic shield significantly reduce；Cause
This material also has special interlayer structure, i.e., with aluminum plating glass other than having the advantages that general filled-type shielding material
Fiber is that the filled layer of conductive material is in centre, supernatant " resin one plates one resin of aluminum fiber " the three-system knot of resin matrix
Structure, such layer structure have more multiple reflecting interface, electromagnetic wave are made to wear compared with common isotropic conductive material
More material when encounter the interface of multiple change in the instantaneous impedance and generate multipath reflection, thus bulk shielding efficiency is high, response frequency range
Also relatively wide.Its specific preparation method is as follows：
Embodiment 1
The preparation method of composite Nano electromagnetic shielding material, this approach includes the following steps：
Step 1, the staple fiber that the aluminium-coated glass-fibre of 2m long is cut into about 40mm long, by 60g magnesium phenolic resin and
10gFe3O4Magnetic particle is poured onto in 250m1 beakers, then pours into 10% acetone soln of 25ml thereto. while toppling over
Stirring；
Step 2, the staple fiber 30g cut, which are transferred in porcelain alms bowl, pours into the preliminary batch mixing of above-mentioned resin solution progress, by squeezing
Pressure, rubbing makes fiber and resin uniformly mix, and when object viscosity to be mixed becomes larger, then to pour into proper amount of acetone molten to the beaker for containing resin
Liquid pours into alms bowl diluted mixture after doing the wash；
Step 3, one resin system mixture of fiber by evenly mixing, which are placed in draught cupboard, to volatilize, cures 72 hours；
Temperature control box target temperature is adjusted to 180 DEG C by step 4, and when temperature is close to 165 DEG C, it is 165 DEG C to adjust target temperature；
Mixed material is divided into size for 4cm by step 5 by hand2It is rapidly uniformly put into mould pressing cavity by left and right sheet by hand
In, it keeps as possible smooth；
Step 6 starts press and observes pressure gauge, and to be shown to start timing when having pressure, first coarse adjustment pressure is to 20MPa, then
This pressure is more accurately kept by finely tuning button；
Step 7, to the end of reaction, cut-out still maintains pressure and sample temperature is waited for reduce, be cooled to room temperature for thermoelectric generator
It dismantles mold and takes out magnetic shielding material sample.
The Fe3O4Magnetic particle preparation method is as follows：
14.0g Iron(III) chloride hexahydrates, 4.2g sodium acetates and 1.4g sodium citrates are dissolved in 70ml ethylene glycol, at 160 DEG C
Lower mechanical agitation 1h is subsequently placed in the stainless steel autoclave containing polytetrafluoroethyllining lining, reaction kettle is positioned over 200
DEG C baking oven in 16h, take out, be water-cooled to room temperature；Product is isolated with magnet, is used in combination absolute ethyl alcohol and deionized water to wash and removes
Unreacted raw material is removed, Fe is finally obtained3O4Magnetic particle.
Embodiment 2
Step 1, the staple fiber that the aluminium-coated glass-fibre of 2m long is cut into about 40mm long, by 50g magnesium phenolic resin and
10gFe3O4Magnetic particle is poured onto in 250m1 beakers, then pours into 10% acetone soln of 25ml thereto. while toppling over
Stirring；Remaining step is the same as embodiment 1.
Embodiment 3
Step 1, the staple fiber that the aluminium-coated glass-fibre of 2m long is cut into about 40mm long, by 40g magnesium phenolic resin and
10gFe3O4Magnetic particle is poured onto in 250m1 beakers, then pours into 10% acetone soln of 25ml thereto. while toppling over
Stirring；Remaining step is the same as embodiment 1.
Embodiment 4
Step 1, the staple fiber that the aluminium-coated glass-fibre of 2m long is cut into about 40mm long, by 30g magnesium phenolic resin and
10gFe3O4Magnetic particle is poured onto in 250m1 beakers, then pours into 10% acetone soln of 25ml thereto. while toppling over
Stirring；Remaining step is the same as embodiment 1.
Embodiment 5
Step 1, the staple fiber that the aluminium-coated glass-fibre of 2m long is cut into about 40mm long, by 20g magnesium phenolic resin and
10gFe3O4Magnetic particle is poured onto in 250m1 beakers, then pours into 10% acetone soln of 25ml thereto. while toppling over
Stirring；Remaining step is the same as embodiment 1.
Embodiment 6
Step 1, the staple fiber that the aluminium-coated glass-fibre of 2m long is cut into about 40mm long, by 10g magnesium phenolic resin and
10gFe3O4Magnetic particle is poured onto in 250m1 beakers, then pours into 10% acetone soln of 25ml thereto. while toppling over
Stirring；Remaining step is the same as embodiment 1.
Embodiment 7
Step 1, the staple fiber that the aluminium-coated glass-fibre of 2m long is cut into about 40mm long, by 60g magnesium phenolic resin and 5gFe3O4
Magnetic particle is poured onto in 250m1 beakers, is then poured into 10% acetone soln of 25ml thereto, is stirred while toppling over；Its
Remaining step is the same as embodiment 1.
Embodiment 8
Step 1, the staple fiber that the aluminium-coated glass-fibre of 2m long is cut into about 40mm long, by 60g magnesium phenolic resin and
15gFe3O4Magnetic particle is poured onto in 250m1 beakers, then pours into 10% acetone soln of 25ml thereto. while toppling over
Stirring；Remaining step is the same as embodiment 1.
Embodiment 9
Step 1, the staple fiber that the aluminium-coated glass-fibre of 2m long is cut into about 40mm long, by 60g magnesium phenolic resin and
20gFe3O4Magnetic particle is poured onto in 250m1 beakers, then pours into 10% acetone soln of 25ml thereto. while toppling over
Stirring；Remaining step is the same as embodiment 1.
Embodiment 10
Step 1, the staple fiber that the aluminium-coated glass-fibre of 2m long is cut into about 40mm long, by 60g magnesium phenolic resin and
1.0gFe3O4Magnetic particle is poured onto in 250m1 beakers, is then poured into 10% acetone soln of 25ml thereto, is toppled over one on one side
It stirs on side；Remaining step is the same as embodiment 1.
Reference examples 1
It is with 1 difference of embodiment：In magnetic shielding material preparation process 1, do not add aluminium-coated glass-fibre, remaining step with
Embodiment 1 is identical.
Reference examples 2
It is with 1 difference of embodiment：In magnetic shielding material preparation process 1, replace aluminium-coated glass-fibre dosage with glass fibre
Constant, remaining step is identical with embodiment 1.
Reference examples 3
It is with 1 difference of embodiment：In magnetic shielding material preparation process 1,80% acetone soln of 25ml, remaining step is added
It is identical with embodiment 1.
Reference examples 4
It is with 1 difference of embodiment：In magnetic shielding material preparation process 1, acetone soln is not added, remaining step and implementation
Example 1 is identical.
Reference examples 5
It is with 1 difference of embodiment：In magnetic shielding material preparation process 1, Fe is not added3O4Magnetic particle, remaining step
It is identical with embodiment 1.
Reference examples 6
It is with 1 difference of embodiment：In magnetic shielding material preparation process 1, replace Fe with the white carbon of equivalent3O4Magnetic particles
Son, remaining step are identical with embodiment 1.
Reference examples 7
It is with 1 difference of embodiment：Fe3O4In magnetic particle preparation process, sodium acetate is not added；Remaining step and implementation
Example 1 is identical.
Reference examples 8
It is with 1 difference of embodiment：Fe3O4In magnetic particle preparation process, ammonium citrate is not added；Remaining step and reality
It is identical to apply example 1.
Reference examples 9
It is with 1 difference of embodiment：Fe3O4In magnetic particle preparation process, Iron(III) chloride hexahydrate, sodium acetate and citric acid
Sodium mass ratio is 5：2：1, remaining step is identical with embodiment 1.
Reference examples 10
It is with 1 difference of embodiment：Fe3O4In magnetic particle preparation process, Iron(III) chloride hexahydrate, sodium acetate and citric acid
Sodium mass ratio is 1：1：1, remaining step is identical with embodiment 1.
Radio frequency electromagnetic field shield effectiveness is measured using Agilent 4396B network/spectrums/impedance analyzer, and shield effectiveness is surveyed
Method for testing is with reference to People's Republic of China (PRC) electronics industry military standard SJ20524-1995《Materials ' Shielding Effectiveness test method》Into
Row measures;Under the conditions of frequency is 1.5GHz, it is as shown in the table for shield effectiveness test result
The experimental results showed that nano electromagnetic shielded layer 11 has good Magnetic Shielding Effectiveness, in one timing of test condition, shielding effect
Energy（SE）Higher, Magnetic Shielding Effectiveness is better, otherwise poorer；In aluminium-coated glass-fibre, magnesium phenolic resin, Fe3O4Magnetic particle quality
Than being 3：6：When 1, other dispensings are fixed, and preparation effect is best, with embodiment 1 the difference lies in that embodiment 2 to embodiment 10 is divided
It Gai Bian not primary raw material aluminium-coated glass-fibre, magnesium phenolic resin, Fe3O4The dosage and proportioning of magnetic particle imitate the shielding of material
There can be different influences；Reference examples 1 to reference examples 2 do not add aluminium-coated glass-fibre and are replaced with simple glass fiber, other
Step is identical, and shield effectiveness is caused to be substantially reduced, and it is very big to illustrate that aluminium-coated glass-fibre influences material magnetic shield performance；It is right
3 preparation process is adjusted to reference examples 4 as usual, do not add acetone or increase acetone dosage, effect is still bad, illustrates acetone pair
The Compound Machining of magnesium phenolic resin is critically important；Reference examples 5 to reference examples 6 do not add Fe3O4Magnetic particle and hard charcoal with equivalent
Black substitution so that shield effectiveness is substantially reduced, and Magnetic Shielding Effectiveness is obviously deteriorated, and illustrates Fe3O4Magnetic particle is important material group
Point；Reference examples 7 to reference examples 10 do not add sodium acetate and sodium citrate and change the proportioning dosage of Iron(III) chloride hexahydrate, iron
The magnetic permeability of magnetic particle changes, and shield effectiveness is obviously deteriorated, and shield effectiveness is not still high；Therefore using nanometer of the present invention electricity
Magnetic masking layer 11 has good Magnetic Shielding Effectiveness.
Claims (5)
1. a kind of Full-shielding automobile wheel speed sensor, including shell（8）, it is characterised in that：The shell（8）Top be fixed with
Fixed arm（1）, and shell（8）Internal bottom is provided with nano electromagnetic shielded layer（11）, the fixed arm（1）Relative to shell
（8）One end be provided with pressing fixed blocks（4）, and pressing fixed blocks（4）Top be connected with fixing sleeve（3）, the fixed arm（1）Relative to
Pressing fixed blocks（4）Side offer connecting hole（14）, and connecting hole（14）Both ends be both provided with locking latch（2）, described outer
Shell（8）Internal middle position is equipped with mounting bracket（12）, and shell（8）Inner wall both sides be both provided with heat-conducting plate（6）, institute
State mounting bracket（12）With two heat-conducting plates（6）Between be both provided with filled layer（13）, and mounting bracket（12）Internal top setting
There is permanent magnet（15）, the permanent magnet（15）The middle position of bottom end is equipped with magnetic core（7）, and magnetic core（7）Bottom end connection
There is polar axis（10）, the mounting bracket（12）The outside of lower semisection is arranged with induction coil（9）, and mounting bracket（12）Inner upper is leaned on
Nearly magnetic core（7）Two side positions at it is symmetrical through there is the electrode pin connected by conducting wire（5）.
2. a kind of Full-shielding automobile wheel speed sensor according to claim 1, it is characterised in that：Two heat-conducting plates
（6）Inside be both provided with thermal conductive material layer.
3. a kind of Full-shielding automobile wheel speed sensor according to claim 1, it is characterised in that：The fixing sleeve（3）For
A kind of hollow cylinder shape structure.
4. a kind of Full-shielding automobile wheel speed sensor according to claim 1, it is characterised in that：The pressing fixed blocks（4）'s
Diameter of section is more than fixing sleeve（3）Diameter of section.
5. a kind of Full-shielding automobile wheel speed sensor according to claim 1, it is characterised in that：The pressing fixed blocks（4）With
Fixed arm（1）It is fixedly connected by fixed seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810279653.6A CN108535508A (en) | 2018-04-01 | 2018-04-01 | A kind of Full-shielding automobile wheel speed sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810279653.6A CN108535508A (en) | 2018-04-01 | 2018-04-01 | A kind of Full-shielding automobile wheel speed sensor |
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| Publication Number | Publication Date |
|---|---|
| CN108535508A true CN108535508A (en) | 2018-09-14 |
Family
ID=63482094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810279653.6A Pending CN108535508A (en) | 2018-04-01 | 2018-04-01 | A kind of Full-shielding automobile wheel speed sensor |
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