CN108006116B - Angle sensor for adjusting arm - Google Patents
Angle sensor for adjusting arm Download PDFInfo
- Publication number
- CN108006116B CN108006116B CN201711437276.6A CN201711437276A CN108006116B CN 108006116 B CN108006116 B CN 108006116B CN 201711437276 A CN201711437276 A CN 201711437276A CN 108006116 B CN108006116 B CN 108006116B
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- angle sensor
- rotating wheel
- cylindrical body
- adjusting arm
- mounting box
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- 230000006698 induction Effects 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 3
- 230000007704 transition Effects 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 22
- 230000002093 peripheral effect Effects 0.000 description 14
- 238000005299 abrasion Methods 0.000 description 13
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 11
- 238000009434 installation Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
- F16D66/021—Apparatus for indicating wear using electrical detection or indication means
- F16D66/022—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness
- F16D66/023—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness directly sensing the position of braking members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
- F16D66/021—Apparatus for indicating wear using electrical detection or indication means
- F16D66/022—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness
- F16D66/025—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness sensing the position of parts of the brake system other than the braking members, e.g. limit switches mounted on master cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D2066/003—Position, angle or speed
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The invention provides an angle sensor for an adjusting arm, and belongs to the technical field of machinery. It has solved the low problem of current angle sensor detection precision. The rotary table is positioned in the mounting box and can rotate relative to the mounting box, a rotating wheel which can rotate is further arranged in the mounting box, the outer diameter of the rotary table is larger than that of the rotating wheel, the rotary table drives the rotating wheel to rotate through a transmission belt or teeth, a magnet is fixedly arranged at the rotating center of the rotating wheel, an induction element which is arranged opposite to the magnet is fixed in the mounting box, and the induction element can induce the rotation of the magnet in real time and perform signal conversion. The device has the advantages of high detection precision, good working stability and the like.
Description
Technical Field
The invention belongs to the technical field of machinery, relates to an angle sensor, and particularly relates to an angle sensor for an adjusting arm.
Background
The adjusting arms in the market have various types, but the use principle and the working mode are basically the same, namely, the shell of the adjusting arm is directly connected to the axle, and then the braking gap is automatically compensated through the adjusting mechanism in the adjusting arm when the braking gap is increased so as to ensure the braking effect. The existing adjusting arm only has the function of automatically adjusting the braking gap, but does not have the condition of detecting the abrasion amount of the friction lining, more abrasion conditions of the friction lining are observed and judged by the naked eyes through experience of a driver, so that the adjusting arm is quite inaccurate, and in addition, the driver needs to observe from the inside of the cab to the side of the wheel every time, so that the adjusting arm is quite inconvenient.
Therefore, in order to facilitate the user to grasp the wear of the pad conveniently, some manufacturers also implement the detection of the wear of the pad by adding an angle sensor to the adjustment arm, which can detect the rotation angle of the cam shaft of the adjustment arm, because the cam shaft of the adjustment arm rotates by an angle when the pad is worn. At present, such angle sensor basically includes an installation box, sets up in the installation box and can pivoted carousel and circuit board, and the installation box is connected on the casing of adjustment arm, and the camshaft one end of adjustment arm stretches into in the installation box and makes the carousel cup joint and form the linkage on the camshaft, only need utilize the circuit board to carry out real-time detection to the rotation angle of carousel when the camshaft drives the carousel rotation like this can make the driver grasp the wearing and tearing condition of friction facing in real time.
However, since the wear amount of the friction lining is substantially in millimeters, the rotation angle of the camshaft is extremely small, resulting in extremely low detection accuracy of the wear amount of the friction lining detected in this way, and it is likely that the detected rotation angle of the camshaft is substantially unchanged despite further wear of the friction lining.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides an angle sensor for an adjusting arm, which aims to solve the technical problem of improving the detection precision of the abrasion loss of a friction lining.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides an angle sensor for adjusting arm, including can connect in the installation box of adjusting arm lateral wall and can circumferentially fix the epaxial carousel of camshaft at the adjusting arm, the carousel is located the installation box and can rotate for the installation box, its characterized in that, the installation box in still be equipped with the pivoted rotation wheel, the external diameter of carousel is greater than the external diameter of rotation wheel and the carousel drives rotation wheel through drive belt or tooth and rotates, rotation wheel's rotation center set firmly the magnet, the installation box in be fixed with the inductive element that sets up relatively with the magnet, inductive element can respond to the rotation of magnet in real time and carry out signal conversion.
The angle sensor is mainly applied to a brake clearance automatic adjusting arm of a drum brake and is used for monitoring the abrasion loss of a friction lining of the drum brake in real time, and the working principle of the angle sensor is as follows: when the friction lining is worn, the cam shaft of the adjusting arm can drive the rotary disc to correspondingly rotate by a certain angle, and the rotary disc can drive the rotating wheel to rotate together through the driving belt or the teeth. After the rotating wheel rotates, the magnet is fixedly arranged on the rotating wheel, so that the rotating wheel can synchronously rotate with the magnet, the magnet rotates to generate a rotating magnetic field, and the induction element can generate a signal and convert the signal into a digital signal under the induction of the rotating magnetic field. The final digital signal may be displayed in the cab for the convenience of the driver's view.
Since the abrasion loss of the friction lining is basically in millimeter units, the change of the rotation angle of the cam shaft and the rotating disc is very small when the friction lining is continuously abraded, and the abrasion loss of the friction lining obtained by directly detecting the rotation angle of the rotating disc is very inaccurate. The angle sensor drives the rotating wheel to rotate through the transmission belt or the teeth by the rotating disc, and because the outer diameter of the rotating disc is larger than the outer diameter of the rotating wheel, the rotating wheel can relatively rotate by a larger angle when the rotating disc rotates by a smaller angle, namely the rotating angle of the rotating disc can be amplified by the rotating wheel, and the magnet is fixedly arranged at the rotating center of the rotating wheel, so that the wearing condition of the friction lining can be reflected more obviously through real-time induction of the rotating quantity of the magnet by the induction element, and the detection precision of the angle sensor on the wearing quantity of the friction lining is improved.
In addition, the sensing element in the angle sensor only senses the rotation of the rotating wheel, and the rotating wheel is smaller for the purpose of amplifying the rotating angle of the turntable, so that the volume of the sensing element can be smaller, and the volume of the whole angle sensor can be reduced, and the manufacturing cost can be reduced.
In the angle sensor for the adjusting arm, the rotating wheel comprises a cylindrical body which is axially limited in the mounting box and can rotate relative to the mounting box, one end of the cylindrical body, which is opposite to the sensing element, is opened, the magnet is fixedly arranged in the cylindrical body, and a yielding hole is penetrated and arranged in the cylindrical body towards the center of one end of sensing, and the yielding hole is opposite to the sensing element.
The rotary wheel is provided with a cylindrical body, one end of the cylindrical body, which is opposite to the sensing element, is provided with an opening, and the magnet is fixedly arranged in the cylindrical body from the opening of the cylindrical body, so that the magnet and the cylindrical body can be fixed together, and when the cylindrical body rotates, the magnet synchronously rotates to amplify the rotation angle of the turntable; meanwhile, a yielding hole is formed in the center of one end, facing the sensing element, of the cylindrical body in a penetrating mode, the yielding hole is opposite to the sensing element, and therefore the magnet can enable the sensing element to sense a rotating magnetic field generated by the magnet through the yielding hole when the cylindrical body rotates, and abrasion loss of the friction lining is accurately detected in real time.
In the angle sensor for the adjusting arm, the rotating wheel further comprises an annular flange located at the outer periphery of the cylindrical body, a penetrating annular clamping groove is formed in the mounting box, and the annular flange penetrates through the annular clamping groove and two end faces of the annular flange are respectively abutted against two side walls of the annular clamping groove.
The annular flange at the outer periphery of the cylindrical body penetrates through the annular clamping groove penetrating through the mounting box, the two end faces of the annular flange are respectively propped against the two side walls of the annular clamping groove to axially limit the cylindrical body, so that the rotating wheel can be prevented from generating axial movement in the rotating process, the influence on the rotating quantity of the circuit board detection magnet due to the axial movement of the rotating wheel is avoided, and the detection precision of the angle sensor is ensured.
In the angle sensor for the adjusting arm, the annular protrusion is arranged in the mounting box, the annular flange comprises a clamping part and a limiting part, the clamping part is bent from one end of the opening of the cylindrical body to the outer peripheral side of the cylindrical body and then bent to the other end of the cylindrical body, the limiting part extends from the end of the clamping part to the outer peripheral side of the clamping part, the limiting part penetrates through the annular clamping groove, and the clamping part is embedded into the annular protrusion cavity and forms radial limiting.
The radial limit is formed in the annular protruding cavity of the embedding of the clamping part on the annular flanging, so that radial limit is formed between the cylindrical body and the mounting box, the rotating wheel can be guaranteed not to generate radial play when rotating, meanwhile, the annular flanging limiting part is matched with the annular clamping groove again to extend into the annular clamping groove so as to guarantee that the rotating wheel can not generate axial play when rotating, the rotating wheel can be stably positioned on the mounting box when rotating through the matching of the radial limit and the axial limit, the rotating stability of the rotating wheel is well guaranteed, and the rotating angle of the rotating wheel can be accurately amplified, so that the detection precision of an angle sensor is improved.
In the angle sensor for the adjusting arm, the joint of the clamping part and the limiting part is in arc transition, the joint of the annular convex end face and the inner wall is in arc transition, the joint of the clamping part and the limiting part is propped against the joint of the annular convex end face and the inner wall, and the outer diameter of the clamping part is gradually increased from one end of the cylindrical body opening to the other end of the cylindrical body.
The joint part of the circular arc transition between the clamping part and the limiting part is propped against the joint part of the circular arc transition between the end face of the annular bulge and the inner wall to form radial limit between the clamping part and the annular bulge so as to ensure the stable rotation of the rotating wheel. Meanwhile, the outer diameter of the clamping part is gradually increased from one end of the opening of the cylindrical body to the other end of the cylindrical body, so that the contact area between the clamping part and the annular bulge can be reduced, and the influence on the detection precision caused by the blocking of the rotating wheel in the rotating process is avoided.
In the angle sensor for the adjusting arm, the positioning head is arranged in the annular protrusion, the positioning head is cylindrical and extends into one end of the opening of the cylindrical body, and a gap is formed between the end face of the positioning head and one end face of the magnet, which faces the positioning head.
The positioning head can support the rotation of the rotating wheel so as to ensure the stable rotation of the rotating wheel, and can also play a role in preventing the radial movement of the rotating wheel to a certain extent so as to improve the detection precision; in addition, the gap between the end surface of the positioning head and the end surface of the magnet facing the positioning head is also used for preventing the positioning head from blocking the rotation of the magnet and the rotating wheel.
In the angle sensor for the adjusting arm, the first engaging tooth is arranged on the outer peripheral side of the limiting part, the second engaging tooth is arranged on the outer peripheral side of the rotary disc, and the first engaging tooth is engaged with the second engaging tooth.
The spacing portion passes annular draw-in groove, sets up the meshing tooth in the periphery side of spacing portion like this, and the periphery side of carousel sets up the meshing tooth two, makes the carousel and rotate between the wheel through the cooperation of meshing tooth one and meshing tooth two and forms the transmission, thereby just so can make the carousel drive the rotation wheel rotate thereby utilize the rotation of rotation wheel and combine the external diameter difference of rotation wheel and carousel to enlarge the rotation angle of carousel to improve angle sensor's detection precision.
In the above angle sensor for an adjusting arm, as another technical scheme, a driving belt is sleeved between the outer peripheral side of the limiting part and the outer peripheral side of the turntable.
The limiting part passes through the annular clamping groove, and a transmission belt is sleeved between the outer peripheral side of the limiting part and the outer peripheral side of the turntable, and the turntable drives the rotating wheel to rotate through the transmission belt, so that the rotating angle of the turntable is amplified by utilizing the rotation of the rotating wheel and combining the difference of the outer diameters of the rotating wheel and the turntable, and the detection precision of the angle sensor is improved.
In the angle sensor for the adjusting arm, the rotating wheel is of an integrated structure.
The rotating wheel is of an integrated structure, and the integrated structure enables the rotating wheel to rotate more stably, so that the detection precision of the angle sensor can be guaranteed to a certain extent.
In the angle sensor for the adjusting arm, the mounting box comprises a box body and an inner cover connected with the box body, the annular protrusion is arranged on one side of the inner cover opposite to the box body, and the annular clamping groove is formed between the annular protrusion and one side of the inner cover opposite to the box body.
When the inner cup is connected with the box body to form a mounting box, the annular raised end face can be propped against one end face of the limiting part and presses the limiting part on one side opposite to the box body and the inner cup, namely, the annular flanging is positioned between the box body and the inner cup, so that the positioning of the rotating wheel in the mounting box is also completed when the mounting box is assembled, and the rotating wheel and the mounting box form axial limiting and radial limiting simultaneously to ensure the rotating stability of the rotating wheel, thereby ensuring that the rotating wheel can accurately amplify the rotating angle of the turntable, and improving the detection precision of the angle sensor.
In the angle sensor for the adjusting arm, a concave positioning cavity is formed in one side, opposite to the inner cover, of the box body, a circuit board is fixed in the positioning cavity, the sensing element is integrated on the circuit board, the cylindrical body stretches into the positioning cavity, at least two arc-shaped raised strips located on the same circumference are arranged on one side, opposite to the inner cover, of the box body at the port of the positioning cavity, and the annular clamping groove is formed between the end face of each arc-shaped raised strip and the annular raised end face.
The concave positioning cavity is formed on one side of the box body, opposite to the inner cover, of the box body, the induction element is integrated on the circuit board and is fixed in the positioning cavity, an annular clamping groove is formed between each arc-shaped convex strip and the annular bulge when the box body is connected with the inner cover to form the mounting box, namely, the end face of each arc-shaped convex strip and the end face of the annular bulge are respectively abutted against the two end faces of the limiting part, the annular flanging of the rotating wheel is clamped in the mounting box, and meanwhile, the cylindrical body of the rotating wheel extends into the positioning cavity to enable the induction element on the circuit board to detect the rotation angle of the magnet so as to improve the detection precision.
In the angle sensor for the adjusting arm, the inner side wall of the positioning cavity is provided with a plurality of clamping blocks, each clamping block is provided with an L-shaped positioning step, and the circuit board is abutted against each positioning step and clamped between the clamping blocks.
When the circuit board is installed, the circuit board is abutted against each positioning step and clamped between each clamping block, so that the circuit board can be conveniently fixed in the installation box.
Compared with the prior art, the angle sensor for the adjusting arm has the following advantages:
1. the angle sensor for the adjusting arm drives the rotating wheel with smaller outer diameter to rotate through the rotating disc with larger outer diameter, and the rotating angle of the rotating disc is amplified by the outer diameter difference, so that the detection precision is improved well;
2. the sensing element in the angle sensor for the adjusting arm only senses the rotation of the rotating wheel, and the rotating wheel is smaller for the purpose of amplifying the rotation angle of the turntable, so that the volume of the sensing element can be smaller, the volume of the whole angle sensor can be reduced, and the manufacturing cost can be reduced;
3. the angle sensor for the adjusting arm realizes axial limit and radial limit of the rotating wheel through the matching of the annular flanging, the annular clamping groove and the annular bulge, well ensures the rotation stability of the rotating wheel, and further improves the detection precision.
Drawings
Fig. 1 is a schematic view of an angle sensor for use on an adjustment arm.
Fig. 2 is an exploded view of the angle sensor and the adjustment arm.
Fig. 3 is a schematic view of the angle sensor for the adjustment arm when the electrical connector is not connected.
Fig. 4 is an exploded view of fig. 3.
Fig. 5 is an exploded view of the other angle of fig. 3.
Fig. 6 is a cross-sectional view of the angle sensor for the adjustment arm when the electrical connector is not connected.
Fig. 7 is a partial enlarged view of fig. 6.
Fig. 8 is a cross-sectional view of fig. 6 without the rotating wheel and magnets.
Fig. 9 is a schematic view of a turning gear in the angle sensor for an adjustment arm.
Fig. 10 is a schematic view of another angle of rotation in the angle sensor for the adjustment arm.
Fig. 11 is a schematic view of the opposite side of the case from the inner cover in the angle sensor for the adjustment arm.
In the figure, 1, a mounting box; 1a, a box body; 1a1, a positioning cavity; 1a2, arc convex strips; 1a3, a clamping block; 1a31, positioning steps; 1a4, a connection portion; 1b, an inner cover; 1b1, annular projections; 1b2, positioning heads; 1c, an annular clamping groove; 2. a turntable; 2a, second meshing teeth; 3. a rotating wheel; 3a, a cylindrical body; 3a1, a relief hole; 3b, annular flanging; 3b1, an engaging portion; 3b2, a limiting part; 3c, meshing teeth I; 4. a circuit board; 4a, an inductive element; 4b, stitching; 5. a magnet; 6. an electrical connector; 7. a housing; 8. and a cam shaft.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
Example 1
As shown in fig. 1 and 2, an angle sensor for an adjusting arm includes a housing 7, a worm wheel and a cam shaft 8, the worm wheel is disposed in the housing 7 and can rotate relative to the housing 7, one end of the cam shaft 8 is inserted into the housing 7, the worm wheel is sleeved on the cam shaft 8 and is in spline fit with the cam shaft 8, and the specific structure of the adjusting arm in this embodiment can refer to an automatic adjusting arm for a brake clearance of an automobile according to application number 201611140721.8 proposed by the applicant.
As shown in fig. 3, 4 and 5, the angle sensor comprises a mounting box 1 connected to one side of a casing 7 and a rotary disc 2 which is arranged in the mounting box 1 and can rotate, wherein one end of a cam shaft 8, which is in spline fit with a worm wheel, extends into the mounting box 1 and is in spline fit with the rotary disc 2 to drive the rotary disc 2 to rotate, and the rotary disc 2 is axially limited and radially limited in the mounting box 1. The angle sensor further comprises a rotating wheel 3 which is arranged in the mounting box 1 and can rotate and a circuit board 4 which is fixed in the mounting box 1, the outer diameter of the rotary disc 2 is larger than that of the rotating wheel 3, the rotary disc 2 can drive the rotating wheel 3 to rotate through teeth, a magnet 5 is arranged at the rotating center of the rotating wheel 3, the circuit board 4 and the magnet 5 are oppositely arranged, and an induction element 4a and a signal processing module are integrated on the circuit board 4, wherein the induction element 4a can adopt a Hall chip. The specific axial and radial limiting structure of the turntable 2 and the mounting box 1 and the specific connection structure of the mounting box 1 and the housing 7 can refer to a wear indicator for adjusting arm and a brake clearance adjusting arm, which have been proposed by the applicant and have application number 201710814205.7.
As shown in fig. 6, 7, 8, 9 and 10, the rotating wheel 3 includes a cylindrical body 3a axially limited in the mounting box 1 and capable of rotating relative to the mounting box 1, one end of the cylindrical body 3a facing away from the circuit board 4 is opened, the magnet 5 is cylindrical and fixedly arranged in the cylindrical body 3a, the cylindrical body 3a is provided with a yielding hole 3a1 penetrating through towards the center of one end of the circuit board 4, and the yielding hole 3a1 is arranged opposite to the sensing element 4 a. The mounting box 1 is internally provided with a penetrating annular clamping groove 1c, the rotating wheel 3 further comprises an annular flange 3b positioned on the outer circumferential side of the cylindrical body 3a, the annular flange 3b penetrates through the annular clamping groove 1c, two end faces of the annular flange 3b are respectively abutted against two side walls of the annular clamping groove 1c, the axial limiting of the annular flange 3b is realized through the matching of the two side walls of the annular clamping groove 1c and the two end faces of the annular flange 3b, that is to say, the axial movement of the rotating wheel 3 in the rotating process is prevented, namely, the rotating of the rotating wheel 3 is more stable, so that the rotating stability of the magnet 5 is improved, the rotating induction precision of the circuit board 4 to the magnet 5 is ensured, and the detecting precision of the angle sensor is improved.
As shown in fig. 4, 7, 9 and 10, an annular protrusion 1b1 is provided in the mounting case 1, the annular flange 3b includes an engaging portion 3b1 formed by bending an opening end portion of the cylindrical body 3a toward the outer peripheral side of the cylindrical body 3a and bending the other end portion of the cylindrical body 3a, and a stopper portion 3b2 formed by extending an end portion of the engaging portion 3b1 toward the outer peripheral side of the engaging portion 3b1, the engaging portion 3b1 is fitted into a cavity of the annular protrusion 1b1, the engaging portion 3b1 and the annular protrusion 1b1 form a radial restriction, the stopper portion 3b2 passes through the annular clamping groove 1c, an engaging tooth one 3c is provided on the outer peripheral side of the stopper portion 3b2, an engaging tooth two 2a is provided on the outer peripheral side of the turntable 2, and the engaging tooth one 3c is engaged with the engaging tooth two 2 a. The annular bulge 1b1 is internally provided with a cylindrical positioning head 1b2, the positioning head 1b2 is embedded into the cylindrical body 3a through an opening of the cylindrical body 3a, a gap is reserved between the end face of the positioning head 1b2 and the end face of the magnet 5, the positioning head 1b2 is embedded into the cylindrical body 3a to support the whole rotating wheel 3, and meanwhile the positioning head 1b2 can also play a certain role in preventing the rotating wheel 3 from radial movement.
As shown in fig. 7, specifically, the rotating wheel 3 is in an integral structure, the connection part of the clamping part 3b1 and the limiting part 3b2 is in arc transition, the connection part of the end surface of the annular protrusion 1b1 and the inner wall is in arc transition, and the connection part of the clamping part 3b1 and the limiting part 3b2 is abutted against the connection part of the end surface of the annular protrusion 1b1 and the inner wall, so that radial limitation can be formed on the rotating wheel 3, and the influence on the detection precision caused by radial movement in the rotating process of the rotating wheel 3 is avoided. In addition, the outer diameter of the engaging portion 3b1 is gradually increased from one end of the opening of the cylindrical body 3a to the other end of the cylindrical body 3a, so that the contact area between the engaging portion 3b1 and the annular protrusion 1b1 can be reduced, and the influence on the detection accuracy due to the blocking of the rotating wheel 3 in the rotating process can be avoided.
As shown in fig. 6, 8 and 11, the mounting box 1 includes a box body 1a and an inner cover 1b connected with the box body 1a, the annular protrusion 1b1 is disposed on one side of the inner cover 1b opposite to the box body 1a, a concave positioning cavity 1a1 is disposed on one side of the box body 1a opposite to the inner cover 1b, a circuit board 4 is fixed in the positioning cavity 1a1, a cylindrical body 3a of the rotating wheel 3 extends into the positioning cavity 1a1, at least two arc-shaped raised strips 1a2 located on the same circumference are disposed on one side of the box body 1a opposite to the inner cover 1b at the port of the positioning cavity 1a, and an annular clamping groove 1c is formed between the end face of each arc-shaped raised strip 1a2 and the end face of the annular raised strip. When the box body 1a is connected with the inner cover 1b to form the mounting box 1, the end face of each arc-shaped protruding strip 1a2 abuts against one end face of the limiting part 3b2, and the end face of the annular protrusion 1b1 abuts against the other end face of the limiting part 3b2, so that the limiting part 3b2 is positioned in the mounting box 1.
As shown in fig. 11, in the present embodiment, a plurality of clamping blocks 1a3 are disposed on the inner side wall of the positioning cavity 1a1, each clamping block 1a3 is provided with an L-shaped positioning step 1a31, and the circuit board 4 abuts against each positioning step 1a31 and is clamped between each clamping block 1a 3. The angle sensor further comprises an electric connector 6, wherein a convex connecting part 1a4 is arranged on one side of the box body 1a, which is opposite to the inner cover 1b, a concave cavity is formed in the connecting part 1a4, one end of the electric connector 6 is inserted into the concave cavity, a plurality of pins 4b are arranged on the circuit board 4, the end parts of the pins 4b penetrate into the concave cavity and are electrically connected with the end of the electric connector 6, the other end of the electric connector 6 is led into a cab and is electrically connected with a central console of a vehicle, and thus a driver can conveniently and directly master the abrasion condition of a friction lining from a display screen of the central console.
When the friction lining is worn, the cam shaft 8 rotates, the rotary table 2 rotates by the same angle along with the cam shaft 8, and the rotary table 2 drives the rotary wheel 3 to rotate through the cooperation of teeth. The rotating wheel 3 rotates to drive the magnet 5 fixed in the cylindrical body 3a to synchronously rotate, the magnet 5 generates a rotating magnetic field when rotating, the sensing element 4a integrated on the circuit board 4 senses the magnetic field generated by the magnet 5 and converts the magnetic field into an electric signal, and then the signal processing module on the circuit board 4 processes and outputs the electric signal transmitted by the sensing element 4a to display the abrasion loss of the friction lining.
Since the abrasion amount of the friction lining is basically in millimeter units, the change of the rotation angle of the cam shaft 8 and the turntable 2 is small when the friction lining is continuously abraded, and the abrasion amount of the friction lining obtained by directly detecting the rotation angle of the turntable 2 is very inaccurate. The rotating wheel 3 is driven to rotate by the rotating disc 2 through the teeth, and because the outer diameter of the rotating disc 2 is larger than the outer diameter of the rotating wheel 3, the rotating wheel 3 can relatively rotate by a larger angle when the rotating disc 2 rotates by a smaller angle, namely the rotating angle of the rotating disc 2 can be amplified by the rotating wheel 3, and the magnet 5 is fixedly arranged at the rotating center of the rotating wheel 3, so that the abrasion condition of the friction lining can be reflected more obviously through real-time induction of the circuit board 4 on the rotating quantity of the magnet 5, and the detection precision of the angle sensor on the abrasion quantity of the friction lining is improved.
Example two
The present embodiment is basically the same in structure and principle as the first embodiment, except that: in this embodiment, a transmission belt is sleeved between the outer peripheral side of the limiting part 3b2 and the outer peripheral side of the turntable 2, and the turntable 2 drives the rotating wheel 3 to rotate through the transmission belt, so that the rotating angle of the turntable 2 is amplified by utilizing the rotation of the rotating wheel 3 and combining the difference of the outer diameters of the rotating wheel 3 and the turntable 2, so as to improve the detection precision of the angle sensor.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (9)
1. The angle sensor for the adjusting arm comprises a mounting box (1) capable of being connected to the side wall of the adjusting arm and a rotary table (2) capable of being circumferentially fixed on a cam shaft of the adjusting arm, wherein the rotary table (2) is located in the mounting box (1) and can rotate relative to the mounting box (1), and the angle sensor is characterized in that a rotatable rotating wheel (3) is further arranged in the mounting box (1), the outer diameter of the rotary table (2) is larger than that of the rotating wheel (3), the rotary table (2) drives the rotating wheel (3) to rotate through a transmission belt or teeth, a magnet (5) is fixedly arranged at the rotation center of the rotating wheel (3), an induction element (4 a) which is opposite to the magnet (5) is fixedly arranged in the mounting box (1), and the induction element (4 a) can conduct real-time induction on rotation of the magnet (5) and signal conversion; the rotating wheel (3) comprises a cylindrical body (3 a) which is axially limited in the mounting box (1) and can rotate relative to the mounting box (1), one end of the cylindrical body (3 a) is open and opposite to the sensing element (4 a), the magnet (5) is fixedly arranged in the cylindrical body (3 a), the rotating wheel (3) further comprises an annular flange (3 b) positioned on the outer periphery of the cylindrical body (3 a), a penetrating annular clamping groove (1 c) is formed in the mounting box (1), and the annular flange (3 b) penetrates through the annular clamping groove (1 c) and two end faces of the annular flange (3 b) are respectively abutted against two side walls of the annular clamping groove (1 c).
2. The angle sensor for an adjusting arm according to claim 1, wherein the cylindrical body (3 a) is provided with a relief hole (3 a 1) penetrating toward the center of one end of the sensing element (4 a), and the relief hole (3 a 1) is disposed opposite to the sensing element (4 a).
3. The angle sensor for an adjusting arm according to claim 2, wherein the mounting box (1) is internally provided with an annular protrusion (1 b 1), the annular flange (3 b) comprises an engaging portion (3 b 1) which is formed by bending one end of an opening of the cylindrical body (3 a) towards the outer periphery of the cylindrical body (3 a) and bending the other end of the cylindrical body (3 a), and a limiting portion (3 b 2) which is formed by extending the end of the engaging portion (3 b 1) towards the outer periphery of the engaging portion (3 b 1), the limiting portion (3 b 2) penetrates through the annular clamping groove (1 c), and the engaging portion (3 b 1) is embedded into a cavity of the annular protrusion (1 b 1) and forms radial limiting.
4. An angle sensor for an adjusting arm according to claim 3, wherein the joint of the engaging portion (3 b 1) and the limiting portion (3 b 2) is in an arc transition, the joint of the end face of the annular protrusion (1 b 1) and the inner wall is in an arc transition, and the joint of the engaging portion (3 b 1) and the limiting portion (3 b 2) abuts against the joint of the end face of the annular protrusion (1 b 1) and the inner wall, and the outer diameter of the engaging portion (3 b 1) gradually increases from one end of the opening of the cylindrical body (3 a) to the other end of the cylindrical body (3 a).
5. The angle sensor for an adjusting arm according to claim 3 or 4, wherein a positioning head (1 b 2) is arranged in the annular protrusion (1 b 1), the positioning head (1 b 2) is cylindrical, the positioning head (1 b 2) extends into one end of the opening of the cylindrical body (3 a), and a gap is formed between the end surface of the positioning head (1 b 2) and one end surface of the magnet (5) facing the positioning head (1 b 2).
6. The angle sensor for an adjusting arm according to claim 3 or 4, wherein the first engaging tooth (3 c) is provided on the outer circumferential side of the limiting portion (3 b 2), the second engaging tooth (2 a) is provided on the outer circumferential side of the turntable (2), and the first engaging tooth (3 c) is engaged with the second engaging tooth (2 a), or a transmission belt is provided between the outer circumferential side of the limiting portion (3 b 2) and the outer circumferential side of the turntable (2).
7. Angle sensor for an adjusting arm according to claim 1 or 2 or 3 or 4, characterized in that the rotating wheel (3) is of one-piece construction.
8. An angle sensor for an adjusting arm according to claim 3, wherein the mounting case (1) comprises a case body (1 a) and an inner cover (1 b) connected to the case body (1 a), the annular protrusion (1 b 1) is provided on a side of the inner cover (1 b) opposite to the case body (1 a), and the annular protrusion (1 b 1) forms the annular clamping groove (1 c) between the side of the inner cover (1 b) opposite to the case body (1 a) and the inner cover (1 b).
9. The angle sensor for adjusting arm according to claim 8, wherein a concave positioning cavity (1 a 1) is arranged on one side of the box body (1 a) opposite to the inner cover (1 b), a circuit board (4) is fixed in the positioning cavity (1 a 1), the sensing element (4 a) is integrated on the circuit board (4), the cylindrical body (3 a) stretches into the positioning cavity (1 a 1), at least two arc protruding strips (1 a 2) positioned on the same circumference are arranged on one side of the box body (1 a) opposite to the inner cover (1 b) at the port of the positioning cavity (1 a 1), and the annular clamping groove (1 c) is formed between the end face of each arc protruding strip (1 a 2) and the end face of the annular protrusion (1 b 1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711437276.6A CN108006116B (en) | 2017-12-26 | 2017-12-26 | Angle sensor for adjusting arm |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711437276.6A CN108006116B (en) | 2017-12-26 | 2017-12-26 | Angle sensor for adjusting arm |
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| CN108006116A CN108006116A (en) | 2018-05-08 |
| CN108006116B true CN108006116B (en) | 2023-12-05 |
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| CN201711437276.6A Active CN108006116B (en) | 2017-12-26 | 2017-12-26 | Angle sensor for adjusting arm |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10941826B2 (en) | 2018-09-12 | 2021-03-09 | Honeywell International Inc. | Determining estimated remaining use of brake assembly |
| CN109139751A (en) * | 2018-10-20 | 2019-01-04 | 绍兴驰达汽车配件制造有限公司 | Arm for automatically regulating clearance of brake with built-in brake pad wear instruction function |
| CN110159681A (en) * | 2019-04-25 | 2019-08-23 | 瑞安市纳德睿电子科技有限公司 | A kind of adjustment arm angle sensor with brake alarm device for vehicle |
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| CN108006116A (en) | 2018-05-08 |
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