CN220322389U - Magneto-electric sensor - Google Patents
Magneto-electric sensor Download PDFInfo
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- CN220322389U CN220322389U CN202321662600.5U CN202321662600U CN220322389U CN 220322389 U CN220322389 U CN 220322389U CN 202321662600 U CN202321662600 U CN 202321662600U CN 220322389 U CN220322389 U CN 220322389U
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- magneto
- coil
- electric sensor
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- winding
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- 238000004804 winding Methods 0.000 claims abstract description 54
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 41
- 239000010959 steel Substances 0.000 claims abstract description 41
- 238000001746 injection moulding Methods 0.000 claims abstract description 27
- 239000004020 conductor Substances 0.000 claims description 14
- 238000005253 cladding Methods 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000011248 coating agent Substances 0.000 abstract 2
- 238000000576 coating method Methods 0.000 abstract 2
- 210000003298 dental enamel Anatomy 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 239000012778 molding material Substances 0.000 description 6
- 229920002302 Nylon 6,6 Polymers 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000003365 glass fiber Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229920006122 polyamide resin Polymers 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229920009788 PA66 GF30 Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The utility model relates to a magneto-electric sensor, which comprises a shell (1), a winding framework (2), a magnetic steel assembly (3), two inserting pieces (4), a coil (5) and a wire harness (6), wherein the winding framework (2) is formed by a first injection molding body which is used for partially coating the magnetic steel assembly (3) and the two inserting pieces (4), the shell (1) is formed by a second injection molding body which is used for at least partially coating the winding framework (2), the coil (5) and the wire harness (6), the winding framework (2) comprises a winding part (21) on which the coil (5) is wound, and the winding part (21) is provided with a winding groove (211-213) for forming a part of an enameled wire of the coil (5) to be routed along the winding groove (211-213). The magneto-electric sensor is simple in manufacturing process, can ensure reliable connection of wire harnesses, and avoids damage to core wires forming coils when the coils are wound.
Description
Technical Field
The present utility model relates to sensors, and more particularly to a magneto-electric sensor, particularly a crankshaft position sensor.
Background
Crank position sensor one of the important sensors in a vehicle control system, the functions of which include: detecting a crank angle, and further detecting the rotation speed of an engine; detecting a piston top dead center position includes detecting a cylinder top dead center signal for controlling ignition and a first cylinder top dead center signal for controlling sequential injection. The crank position sensor typically includes a magnetic conductor, magnetic steel, a coil, a bobbin, and a housing. The conventional manufacturing method of the crank position sensor is generally to first injection-mold a bobbin and a housing, then mount a magnetizer and a magnetic steel on the bobbin and wind a coil, finally assemble the bobbin assembly into the housing, and then connect a wire harness. Such conventional manufacturing methods have complicated processes, low production efficiency, and may damage core wires constituting the coil when the coil is wound.
Disclosure of Invention
The present utility model is directed to solving one or more of the problems set forth above.
A first aspect of the present utility model provides a magneto-electric sensor comprising a housing, a bobbin, a magnetic steel assembly, two insert sheets, a coil and a wire harness, wherein the bobbin is formed of a first injection-molded body partially covering the magnetic steel assembly and the two insert sheets, the housing is formed of a second injection-molded body at least partially covering the bobbin, the coil and the wire harness, the bobbin includes a winding portion around which the coil is wound, the winding portion is provided with a winding groove along which a portion of an enamel wire forming the coil is routed.
In a preferred embodiment, the winding slot includes a first annular slot at a first end of the winding portion, a second annular slot at a second end of the winding portion, and an inclined slot extending between the first and second annular slots.
In a preferred embodiment, the bobbin further includes a waterproof rib disposed adjacent to the second annular groove.
In a preferred embodiment, the bobbin further comprises two wire slots, and the two terminals of the coil are welded to the first ends of the two inserting pieces through the two wire slots, respectively.
In a preferred embodiment, the bobbin further includes a positioning post for positioning during injection molding of the housing and a fixing block for fixing the bobbin when the coil is wound.
In a preferred embodiment, the magnetic steel assembly comprises a sleeve, and magnetic steel, a magnetizer and a pole which are assembled together through the sleeve, wherein the magnetic steel is arranged between the magnetizer and the pole.
In a preferred embodiment, the end of the pole on the opposite side to the magnetic steel is configured as a step.
In a preferred embodiment, the first end of the wire harness is riveted with the second ends of the two tabs, and the second end of the wire harness is connected with the connector.
In a preferred embodiment, the housing comprises a mounting plate provided with mounting holes and bushings inserted into the mounting holes during injection molding of the housing.
In a preferred embodiment, the magneto-electric sensor is a crankshaft position sensor.
According to the utility model, the winding framework is formed by the first injection molding body which partially covers the magnetic steel assembly and the two inserting pieces, the shell is formed by the second injection molding body which at least partially covers the winding framework, the coil and the wire harness, and the procedures of installing the magnetic conductors and the magnetic steel and the procedures of assembling after independently forming the shell are reduced, so that the manufacturing process is simple, the production efficiency is improved, and the connection reliability of the wire harness is ensured. In addition, the winding portion of the bobbin is provided with a winding groove along which a portion of the enamel wire for forming the coil is routed, thus preventing the core wire constituting the coil from being crushed due to tension at the initial stage of winding.
Drawings
FIG. 1 is a schematic diagram of a magneto-electric sensor in accordance with an embodiment of the utility model;
FIG. 2 is an exploded schematic view of the magneto-electric sensor shown in FIG. 1;
FIG. 3 is a schematic illustration of a magnetic steel assembly;
FIG. 4 is a schematic illustration of a magnetic steel assembly and insert prior to injection molding;
FIGS. 5 and 6 are schematic views of the bobbin after injection molding on the basis of FIG. 4;
fig. 7 is a schematic view after winding the coil on the basis of fig. 5 and 6;
fig. 8 is a schematic view after connecting the harness on the basis of fig. 7;
fig. 9 is a schematic view of the housing after injection molding based on fig. 8.
Detailed Description
The following describes the technical scheme of the present utility model in detail with reference to the accompanying drawings. The embodiments described herein are presented by way of example only and should not be construed as limiting the utility model.
Fig. 1 is a schematic view of a magneto-electric sensor according to an embodiment of the present utility model, and fig. 2 is an exploded schematic view of the magneto-electric sensor shown in fig. 1. In the exploded view of fig. 2, the various components are not drawn to the same scale.
As shown in fig. 1 and 2, the magneto-electric sensor in the present embodiment includes a housing 1, a bobbin 2, a magnetic steel assembly 3 (see fig. 3) composed of a sleeve 31, a magnetic steel 32, a magnetic conductor 33, and a pole 34, two insertion pieces 4, a coil 5 wound with an enameled wire, a wire harness 6, and a bushing 7. The constituent elements are described in detail below in connection with the manufacturing process of the magneto-electric sensor.
As shown in fig. 2 and 3, the magnetic steel assembly 3 in the present embodiment includes a sleeve 31, and a magnetic steel 32, a magnetic conductor 33, and a pole 34 assembled together by the sleeve 31, wherein the magnetic steel 32 is disposed between the magnetic conductor 33 and the pole 34. The sleeve 31 is hollow and cylindrical, and an inner wall of the sleeve at one end of the magnetizer 33 is provided with a radially inward protruding edge. Sleeve 31 is preferably made of plastic material, PA66 GF30 (30% glass fiber reinforced nylon 66) being used in this embodiment. The magnetic steel 32 is a cylinder. The magnetic conductor 33 is substantially funnel-shaped, and its larger diameter end is located on the magnetic steel 32 side and is provided with a radially outwardly protruding ledge. For ease of positioning, the smaller diameter end of the magnetic conductor 33 may be partially cut away along a longitudinal plane parallel to the central axis. The pole 34 is substantially cylindrical, and an end portion thereof located on the opposite side from the magnetic steel 32 is configured as a stepped portion. By configuring one end of the pole 34 as a stepped portion, the magnet steel 32 and the pole 34 can be prevented from being reversely attached, and the pole 34 can be used for positioning when the bobbin 2 is injection-molded.
When assembling the magnetic steel assembly 3, the larger diameter end of the magnetic conductor 33 may be inserted into one end of the sleeve 31 first, such that the ledge on the magnetic conductor 33 abuts the rim on the inner wall of the sleeve 31, thereby defining the position of the magnetic conductor 33. Then, the magnetic steel 32 and the pole 34 may be sequentially inserted into the other end of the sleeve 31 such that the stepped portion of the pole 34 is exposed to the outside of the sleeve 31, and a pressing force is applied from the stepped portion, thereby completing the assembly of the magnetic steel assembly 3. The magnetizer 33, the magnetic steel 32 and the pole 34 are assembled together through the sleeve 31, so that the positioning during injection molding of the winding framework 2 is facilitated. As an example, the assembly of the magnetic steel assembly 3 may be performed by means of a press-fitting apparatus disclosed in chinese patent No. CN 218874349U.
After the assembly of the magnet steel assembly 3, as shown in fig. 4, the magnet steel assembly 3 is placed together with the two insert pieces 4 into a first mold, not shown. The first end 41 and the second end 42 of each tab 4 extend substantially perpendicularly to each other, a winding groove is provided at the end of the first end 41, and a rivet is provided at the end of the second end 42. The positioning mechanism in the first mould is able to ensure that the magnetic steel assembly 3 and the two inserts 4 are in the correct relative position, for example as shown in fig. 4.
Then, by injecting a molten injection molding material into the first mold, a bobbin assembly as shown in fig. 5 and 6 can be formed in which the bobbin 2 is formed from an injection molding that partially encapsulates the magnetic steel assembly 3 and the two insert sheets 4. The injection molding material used to form the bobbin 2 may be a thermoplastic resin such as polyamide resin (nylon). PA66 GF25 (25% glass fiber reinforced nylon 66) was used in this example.
The first mold is designed such that the injection molded bobbin 2 includes a winding portion 21 on which the coil 5 is wound, two wire grooves 22 provided adjacent to a first end of the winding portion 21, and a waterproof rib 23 provided adjacent to a second end of the winding portion 21, as shown in fig. 5 and 6. The winding portion 21 is provided with a winding groove including a first annular groove 211 at a first end thereof, a second annular groove 212 at a second end thereof, and an inclined groove 213 extending between the first annular groove 211 and the second annular groove 212. Only one inclined slot 213 is shown in fig. 5 and 6, but it will be understood by those skilled in the art that there is another similar inclined slot 213 on the opposite side of the wire winding portion 21. As described below, a portion of the enamel wire for forming the coil 5 is routed along the winding grooves 211-213.
The first mold is also designed such that the injection molded bobbin 2 includes a positioning post 24 for positioning during injection molding of the housing 1 and a fixing block 25 for fixing the bobbin 2 when the coil 5 is wound.
After the bobbin 2 is injection-molded, as shown in fig. 7, the coil 5 is provided by winding the enamel wire around the winding portion 21 of the bobbin 2. Specifically, one end of the enamel wire is first wound around the first end 41 of one of the inserting pieces 4, and then the enamel wire is introduced into the first annular groove 211 of the winding part 21 through the corresponding one of the wire grooves 23 of the bobbin 2. After being wound several turns in the first annular groove 211, the enamel wire enters the second annular groove 212 via the inclined groove 213, and then returns to the first annular groove 211 via the other inclined groove 213 after being wound several turns in the second annular groove 212. The above process is repeated until the first annular groove 211, the second annular groove 212 and the inclined groove 213 are substantially filled with enamel wire. Then, the winding of the enamel wire on the winding portion 21 is continued in a conventional manner, and finally the enamel wire is passed through the other wire groove 23 of the bobbin 2 and wound on the first end 41 of the other tab 4. During the winding of the coil 5, the bobbin 2 is fixed by the fixing blocks 25 on the bobbin 2.
After the winding is completed, an insulating tape is coated on the enameled wire on the winding portion 21. Then, the first ends 41 of the two inserting pieces 4 are welded with the enamel wire wound thereon, and the first ends 41 of the two inserting pieces 4 are oppositely bent to substantially follow the outer circumferential surface of the sleeve 31, and finally, insulating silica gel is coated in the vicinity of the first ends 41 of the two inserting pieces 4, thereby completing the work of providing the coil 5 on the bobbin 2.
Next, the first end of the wire harness 6 is riveted with the second ends 42 of the two tabs 4 to form the assembly shown in fig. 8. The second end of the wire harness 6 is connected to the connector 61 or the connection terminal.
The assembly shown in fig. 8 is then placed in a second mould, not shown, together with the bushing 7. By injecting a molten injection molding material into the second mold, an assembly as shown in fig. 9 can be formed in which the case 1 is formed from an injection molding that at least partially encapsulates the bobbin 2, the coil 5, and the wire harness 6. The injection molding material used to form the housing 1 may be a thermoplastic resin, such as a polyamide resin (nylon). PA66 GF25 (25% glass fiber reinforced nylon 66) was used in this example, as was the same injection molding material used to form the bobbin 2.
In the process of forming the housing 1 by injection molding, the positioning column 24 on the winding framework 2 and the magnetizer 33 of the magnetic steel component 3 are matched with corresponding positioning mechanisms on the second mold to position the winding framework assembly, and meanwhile, the positioning pin on the second mold is used for positioning the bushing 7. The waterproof ribs 23 on the winding frame 2 are fused with the injection molding material forming the housing 1, and can reliably play a role in waterproof.
The second mould is designed such that the injection moulded housing 1 comprises a mounting plate 11, which mounting plate 11 is provided with mounting holes into which the bushings 7 are inserted. The mounting plate 11 is used to mount the sensor on, for example, a vehicle, for example, bolts may be passed through the mounting holes to be engaged with screw holes on the vehicle-side mounting member. The bush 7 can improve the strength of the mounting hole portion to ensure the mounting reliability.
After the housing 1 is injection molded, the magnetic conductor 33 may be cut to remove a smaller diameter portion thereof for positioning during injection molding. The magnetizer 33 can then be magnetized and tested for performance, ultimately forming a magneto-electric sensor. After injection molding, the problem of inaccurate injection molding positioning caused by early magnetization can be effectively prevented.
The magneto-electric sensor provided by the utility model is preferably a crankshaft position sensor for a vehicle engine. However, the present utility model is not limited thereto and can be applied to any magneto-electric sensor.
According to the present utility model, the bobbin 2 is formed of the first injection-molded body partially covering the magnetic steel assembly 3 and the two insertion pieces 4, the case 1 is formed of the second injection-molded body at least partially covering the bobbin 2, the coil 5 and the wire harness 6, and since the process of installing the magnetic conductors and the magnetic steel and the process of assembling after separately forming the case are reduced, the manufacturing process is simple, the production efficiency is improved, and the connection reliability of the wire harness is ensured. In addition, the winding portion 21 of the bobbin 2 is provided with winding grooves 211 to 213 along which a portion of the enamel wire for forming the coil 5 is routed, thereby preventing the core wire constituting the coil from being crushed due to tension at the initial stage of winding.
It is to be understood that the above-described embodiments of the present utility model are merely illustrative of the application of the principles of the present utility model and that the present utility model is not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the utility model. The scope of the utility model is to be defined only by the meaning of the language of the following claims and the equivalents thereof.
Claims (10)
1. The utility model provides a magnetoelectric sensor, includes shell (1), wire winding skeleton (2), magnet steel assembly (3), two inserted sheet (4), coil (5) and pencil (6), its characterized in that, wire winding skeleton (2) by the partial cladding magnet steel assembly (3) with the first injection molding body of two inserted sheet (4), shell (1) by at least partial cladding wire winding skeleton (2) coil (5) with the second injection molding body of pencil (6), wire winding skeleton (2) including the confession coil (5) twine wire winding portion (21) on it, wire winding portion (21) are equipped with wire winding groove, are used for forming a part of the enameled wire of coil (5) is followed wire winding groove walks the line.
2. The magneto-electric sensor according to claim 1, wherein the winding slot) comprises a first annular slot (211) at a first end of the winding portion (21), a second annular slot (212) at a second end of the winding portion (21), and an inclined slot (213) extending between the first annular slot (211) and the second annular slot (212).
3. The magneto-electric sensor according to claim 2, wherein the bobbin (2) further comprises a waterproof rib (22) provided adjacent to the second annular groove (212).
4. The magneto-electric sensor according to claim 1, characterized in that the bobbin (2) further comprises two wire slots (23), and that the two terminals of the coil (5) are soldered together with the first ends (41) of the two tabs (4) through the two wire slots (23), respectively.
5. The magneto-electric sensor according to claim 1, characterized in that the bobbin (2) further comprises a positioning post (24) for positioning during injection molding of the housing (1) and a fixing block (25) for fixing the bobbin (2) when the coil (5) is wound.
6. The magneto-electric sensor according to claim 1, characterized in that the magnet steel assembly (3) comprises a sleeve (31) and a magnet steel (32), a magnetic conductor (33) and a pole (34) assembled together by the sleeve (31), wherein the magnet steel (32) is arranged between the magnetic conductor (33) and the pole (34).
7. The magneto-electric sensor according to claim 6, wherein an end of the pole (34) on the opposite side from the magnetic steel (32) is configured as a stepped portion.
8. Magneto-electric sensor according to claim 1, characterized in that the first end of the wire harness (6) is riveted with the second ends (42) of the two tabs (4), the second end of the wire harness (6) being connected with a connector (61).
9. Magneto-electric sensor according to claim 1, characterized in that the housing (1) comprises a mounting plate (11), which mounting plate (11) is provided with mounting holes and bushings (7) embedded in the mounting holes during injection moulding of the housing (1).
10. The magneto-electric sensor of any one of claims 1 to 9, wherein the magneto-electric sensor is a crankshaft position sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321662600.5U CN220322389U (en) | 2023-06-28 | 2023-06-28 | Magneto-electric sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321662600.5U CN220322389U (en) | 2023-06-28 | 2023-06-28 | Magneto-electric sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220322389U true CN220322389U (en) | 2024-01-09 |
Family
ID=89417305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321662600.5U Active CN220322389U (en) | 2023-06-28 | 2023-06-28 | Magneto-electric sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220322389U (en) |
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- 2023-06-28 CN CN202321662600.5U patent/CN220322389U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |