JPH1048231A - Pickup coil and pickup sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contain the joint of a winding to a terminal smoothly and surely along the circumferential direction of a bobbin. SOLUTION: A pair of rod-like terminals 21, 31 are turnable about the axis of a bobbin 11 and the L-shaped joints 21a, 31a of respective terminals 21, 31, connected electrically with the forward end 12a or the rearward end 12b of a winding 12 wound around the bobbin 11, can contain the flange part 15 of the bobbin 11 in the circumferential direction of a tubular part 16 extending axially outward. Since the joints 21a, 31a of the terminals 21, 31 can be contained in the circumferential direction of the tubular part 16, outer diameter of the bobbin 11 is not increased and since undue stress is not applied to the bends of the terminals 21, 31, spring back does not take place and the joints 21a, 31a of the terminals 21, 31 can be contained surely at a desired position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickup coil for detecting the number of rotations and a rotation position of a rotating body, and a pickup sensor using the pickup coil.

[0002]

2. Description of the Related Art Conventionally, in a pickup coil, a connection portion of a terminal electrically connected to a leading end portion and a trailing end portion of a winding wound around a bobbin is outside the outer diameter of a bobbin flange before connection. It is preferable in the process to be in a state of protruding from the surface. On the other hand, it is preferable that the connection portion of the terminal is stored by bending or the like so as not to protrude outside the outer diameter of the flange portion of the bobbin after the connection.

[0003] As shown in FIG. 3, the terminal accommodating step of the pickup coil, a winding 1 wound around a bobbin 11 is shown.
2 are connected by soldering to the terminal portions 121a and 131a formed by radially bending the terminal portions 121 and 131 made of a plate material and the terminal portions 121a and 131a, and then to the connection portions 121a and 13 of the terminals 121 and 131.
As shown by an arrow in FIG. 3, it is conceivable that 1 a is folded and stored on the outer peripheral side of the winding 12 in parallel with the axial direction of the bobbin 11. In such a case, the outer diameter of the winding 12 is increased, which causes a reduction in the winding efficiency.

[0004] As shown in FIG. 4, another terminal storing step of the pickup coil is shown. Terminals 121 and 131 made of a plate material and a leading end 12 a and a trailing end 12 b of a winding 12 wound on a bobbin 11 are arranged in a radial direction. After the connection portions 121a and 131a are connected by soldering, the connection portions 121 of the terminals 121 and 131 are connected.
a, 131a, as shown by arrows in FIG.
It is conceivable to bend and store it on the opposite side to the bobbin 11 in parallel with the axial direction of the first. In such a case, the winding 12
Of the terminal 121,
If the terminals 121 and 131 are bent at a bending angle of about 1
Since the angle is 80 °, the terminals 121 and 131 may break themselves.

[0005] As a prior art document relating to a pickup coil and a pickup sensor which addresses such a problem, one disclosed in Japanese Utility Model Laid-Open No. 5-92738 is known. In this technique, a technique is disclosed in which a terminal (a terminal for a conductive wire) of a pickup coil is folded and accommodated along a circumferential direction on a plane perpendicular to the axial direction of the bobbin.

[0006]

However, when the connection portion of the terminal connected to the leading end or the trailing end of the winding wound around the bobbin of the pickup coil is bent along the circumferential direction of the bobbin, the terminal is bent. Due to the occurrence of springback or the like in the bent portion, it was not easy to put the connection portion of the terminal at a desired position (within the range).

In view of the above, the present invention has been made in order to solve such a problem, and has been constructed using a pickup coil capable of easily and securely housing a terminal along a circumferential direction of a bobbin, and using the pickup coil. The task is to provide a pickup sensor.

[0008]

According to the pickup coil of the present invention, the pair of rod-shaped terminals are rotatable with respect to the axial direction of the bobbin, and the tip end of the winding wound on the bobbin or The L-shaped connection part of each terminal electrically connected to the terminal part can be housed in the circumferential direction of the cylindrical part that extends the flange of the bobbin outward in the axial direction. Thereby, when connecting the L-shaped connection portion of the terminal to the leading end portion or the terminal end portion of the winding, it can be positioned by projecting outward from the flange portion of the bobbin. Soldering process is easy. Thereafter, the terminal is rotated in the axial direction of the bobbin, and the connection portion can be accommodated in the circumferential direction of the cylindrical portion, so that the outer diameter shape of the bobbin does not increase, and further, no excessive stress is applied to the bent portion of the terminal. Since there is no occurrence of springback or the like, an effect is obtained that the connection portion of the terminal can be securely stored at a desired position.

According to the pickup coil of the present invention, the connecting portions of the pair of terminals can be housed in the directions in which the windings are loosened. For this reason, the connection part and the winding are housed in the loosening direction by considering the winding direction of the winding to the bobbin and the rotation direction of the terminal. For this reason, there is obtained an effect that an unreasonable stress is not applied to the leading end portion or the trailing end portion of the winding to cause disconnection or the like.

According to the pickup sensor of the third aspect,
A pair of rod-shaped terminals are rotatable in the axial direction of the bobbin, and an L-shaped connection portion of each terminal electrically connected to a winding wound around the bobbin in which the iron core is inserted. The flange portion of the bobbin is extended outward in the axial direction, and can be stored in the circumferential direction of the cylindrical portion containing the permanent magnet closely attached to the iron core. Electric power is generated and the rotation state of the rotating body is detected. For this reason, when connecting the L-shaped connection part of the terminal to the leading end or the terminal end of the winding, the terminal can be projected outward from the bobbin flange and positioned so that the winding process of the winding and the winding and the connecting part can be performed. Soldering process is easy. Thereafter, the terminal is rotated in the axial direction of the bobbin, and the connection portion can be accommodated in the circumferential direction of the cylindrical portion, so that the outer diameter shape of the bobbin does not increase, and further, no excessive stress is applied to the bent portion of the terminal. Since the connection portion of the terminal can be securely housed at a desired position without occurrence of springback or the like, the manufacturing process is stabilized, and an effect that an extremely compact and highly reliable pickup sensor can be configured can be obtained.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples.

FIG. 1 is a block diagram showing a pickup coil according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a pickup sensor formed using the pickup coil of FIG. In addition, the same reference numerals and symbols are given to components having the same configuration or a corresponding part as the above-mentioned conventional one.

In FIG. 1, a bobbin 11 has a cylindrical winding body 13 around which a winding 12 is wound.
Are formed at both ends. Further, the bobbin 11 is formed with a cylindrical cylindrical portion 16 in which one flange portion 15 is extended outward in the axial direction, and the flange portion 15 is formed with grooves 17 and 18. The outer circumference of the cylindrical portion 16 passes through the grooves 17 and 18 of the flange portion 15 and the winding 12
A support portion 22, which rotatably supports round rod-shaped terminals 21, 31 having L-shaped connection portions 21a, 31a in order to electrically connect the front end portion 12a or the terminal end portion 12b thereof, respectively, in the axial direction. 23 (32, 33) are formed.

The support portions 22, 23 (32, 33) of the terminals 21, 31 of the cylindrical portion 16 have an inner diameter slightly smaller than the wire diameter of the round bar of the terminals 21, 31 and a notch size at the slit entrance. 21 and 31 are formed slightly narrower than the diameter of the round bar. As a result, the terminals 21 and 31 are connected to the support portions 22 and 23 (32,
33) before the winding of the winding 12 is completed, the connection portions 21a and 31a are inserted into the slit entrance by pressing.
As shown by the broken line in FIG.
It can be positioned and supported so as to protrude outward from the first flange 15.

Further, a terminal 21,
Support part 2 for accommodating connection parts 21a, 31a of 31
2, 23 (32, 33) in the same shape and circumferential storage section 2
4, 34 are formed.

In the pickup coil configured as described above, one end portion 12a of the winding 12 is connected to the cylindrical portion 16 of the bobbin 11 from which the flange portion 15 is extended by an automatic winding machine (not shown). Connecting part 2 supported by supporting parts 22 and 23
After being wound around 1a, the bobbin 11 is started to rotate, and the winding 12 is wound around the winding drum 13. And the winding 12
When the winding of the bobbin 11 around the winding body 13 is completed, the rotation of the bobbin 11 is stopped, and then the other end portion 12b of the winding 12 is connected to the support portion 3 of the cylindrical portion 16 from which the flange portion 15 of the bobbin 11 is extended.
It is wrapped around the connecting portion 31a supported by the connecting members 2 and 33. Thereafter, the distal end portion 12 of the winding 12 of the connection portions 21a and 31a is formed.
a or the part where the terminal portion 12b is tangled is soldered.

Next, the connecting portion 21 of the terminals 21 and 31
1a are rotated in the circumferential direction of the cylindrical portion 16 as shown by arrows in FIG. 1A, and are inserted and stored in the storage portions 24 and 34. At this time, the leading end 12a or the terminal end 12b of the winding 12 wound around the bobbin 11 and soldered to the connecting portions 21a, 31a of the terminals 21, 31 pass through the grooves 17, 18 of the flange 15, respectively. Here, the rotation direction of the connecting portions 21a and 31a of the terminals 21 and 31 is set to the loosening direction of the winding 12 wound around the bobbin 11, respectively.
When the connection portions 21a and 31a are housed, the winding 12
There is no possibility that the leading end 12a or the terminal end 12b is pulled and disconnected. In addition, terminals 21 and 31
When the connecting portions 21a and 31a of the
The loose portion of the tip 12a or the end 12b of the
Since it can be accommodated in the insides 7 and 18, it does not protrude from the outer diameter of the flange portion 15.

Next, a pickup sensor constituted by using the above-described pickup coil will be described with reference to FIG.

In FIG. 2, an iron core 41 is inserted into the winding drum section 13 of the bobbin 11 around which the winding wire 12 is wound.
The cylindrical portion 16 in which the terminals 21 and 31 to which the leading end portion 12a or the terminal end portion 12b of the winding 12 is electrically connected is supported and accommodated is provided with a permanent magnet 42 closely attached to the iron core 41 and the direction of the magnetic force lines. A back core 43 made of a magnetic material for stabilization is incorporated. Then, the ends 21 of the terminals 21 and 31 extended from the cylindrical portion 16
b and 31b are soldered to connector terminals 51 and 52, respectively.

In this assembled state, the pickup sensor 100 is formed from the cylindrical portion 16 to a part of the connector terminals 51 and 52 by resin molding. The outer periphery of the bobbin 11 and the cylindrical portion 16 of the pickup sensor 100 is covered and covered with a collar 19 made of a nonmagnetic material having a bottomed cylindrical shape.
0 using the O-ring 54 inserted around the outer circumference of the collar 1
9 prevents invasion of water or the like into the inside, and protects the bobbin 11 from the surrounding environment. Further, the pickup sensor 100
Then, the pickup coil side and the connector terminals 51, 52
The connector terminals 51 and 52 are separated and protected from the surrounding environment on the pickup coil side by using an O-ring 55 inserted around the outer periphery between the pickup coils.

The pickup sensor 100 has its iron core 41
Of rotor (rotating body) 200 made of magnetic material
It is fixed so as to face 01. As a result, the pickup sensor 100 extracts the induced electromotive force generated in the winding 12 according to the change in the magnetic flux density due to the presence or absence of the protrusion 201 of the rotor 200 that is rotated to face the iron core 41 from the connector terminals 51 and 52. By performing predetermined processing on this signal, the rotation speed of the rotor 200 and the
1 can be detected.

As described above, the pickup coil of this embodiment has the bobbin 11 on which the winding 12 is wound around the winding drum 13 having the flange portions 14 and 15 at both ends, and one flange on the outside of the bobbin 11 in the axial direction. A cylindrical portion 16 extending from the portion 15; and L-shaped connecting portions 21a and 31a disposed on the outer periphery of the cylindrical portion 16 and electrically connected to the leading end portion 12a or the terminal end portion 12b of the winding 12, respectively. A pair of terminals 21 and 31 having a round bar shape, the terminals 21 and 31 being rotatably supported in the axial direction of the bobbin 11,
The connecting portions 21a and 31a connected to the cylindrical portion 16 can be housed in the circumferential direction of the cylindrical portion 16.

That is, a pair of terminals 2 having a round bar shape
Numerals 1 and 31 are rotatable with respect to the axial direction of the bobbin 11, and a tip 12 a of a winding 12 wound around the bobbin 11.
Alternatively, the L-shaped connection portions 21a and 31a of the terminals 21 and 31 electrically connected to the terminal portion 12b are connected to the bobbin 1.
The first flange portion 15 can be accommodated in the circumferential direction of the cylindrical portion 16 extending outward in the axial direction.

For this reason, when connecting the L-shaped connecting portions 21a and 31a of the terminals 21 and 31 to the leading end 12a or the terminating end 12b of the winding 12, the connecting portions 2a
1a and 31a can be positioned outside the flange 15 of the bobbin 11 so that the winding process of the winding 12 and the winding 1
2 and the connecting portions 21a and 31a are easily soldered. And in the final assembly, Terminal 21,
31 is rotated in the axial direction of the bobbin 11, and the connecting portion 21
Since the a and 31a are accommodated in the circumferential direction of the cylindrical portion 16, the outer diameter of the bobbin 11 does not increase, and furthermore, excessive stress is not applied to the bent portions of the terminals 21 and 31, so that springback or the like occurs. Terminals 21 and 31
The connecting portions 21a and 31a can be securely stored at desired positions.

Further, the pair of terminals 21 and 31 of the pickup coil of the present embodiment are such that the connection portions 21a and 31a can be housed in the direction in which the winding 12 is loosened, respectively.

That is, by taking into account the direction in which the winding 12 is wound around the bobbin 11 and the direction of rotation of the terminals 21 and 31, the connection portions 21a and 31a and the winding 12 are accommodated in a loosening direction. Become. For this reason, an unreasonable stress is not applied to the leading end portion 12a or the terminal end portion 12b of the winding 12, so that disconnection or the like does not occur.

Then, the pickup sensor 1 of this embodiment
00 is a bobbin 11 in which the winding wire 12 is wound around a winding drum section 13 having flanges 14 and 15 at both ends, and a core 41 is inserted and one flange 15 is disposed axially outside the bobbin 11.
Is extended, and the cylindrical portion 16 containing the permanent magnet 42 closely attached to the iron core 41 and the outer periphery of the cylindrical portion 16 are electrically connected to the distal end portion 12a or the terminal end portion 12b of the winding 12, respectively. It is a round bar shape having L-shaped connection portions 21a, 31a, is rotatably supported in parallel with the axial direction of the bobbin 11, and has connection portions 21a, 31a connected to the winding 12 in the circumferential direction of the cylindrical portion 16. A pair of stowable terminals 2
1 and 31 for detecting the number of rotations and the rotational position of the rotor 200 as the rotational state based on the induced electromotive force generated in the winding 12 in response to the rotation of the rotor 200.

Therefore, when connecting the L-shaped connecting portions 21a and 31a of the terminals 21 and 31 to the leading end portion 12a or the terminal end portion 12b of the winding 12, it is possible to protrude outward from the flange portion 15 of the bobbin 11 and position it. Winding 1
2 and the step of soldering the windings 12 to the connecting portions 21a and 31a are easy. After this, Terminal 2
1 and 31 are rotated in the axial direction of the bobbin 11, and the connecting portions 21a and 31a can be accommodated in the circumferential direction of the cylindrical portion 16, so that the outer diameter shape of the bobbin 11 does not increase.
Since no excessive stress is applied to the bent portions of the terminals 21 and 31 and no springback occurs,
The connection portions 21a, 31a of the 31 can be securely stored at desired positions. Pickup sensor 10 thus configured
0 can simplify the manufacturing process and is extremely compact and highly reliable.

In the above embodiment, the terminal 2
1, 31 used a round bar-shaped material. However, the present invention is not limited to this, and may be a polygonal bar-shaped material. What is necessary is just to have a shape which can be supported rotatably in an axial direction.

Further, the pickup sensor 1 of the above embodiment
00 is formed by resin molding from the cylindrical portion 16 to the terminals 21 and 31 side. However, the present invention is not limited to this. May be formed by resin molding, including the outer periphery of.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a pickup coil according to an example of an embodiment of the present invention.

FIG. 2 is a sectional view showing a pickup sensor configured using the pickup coil of FIG.

FIG. 3 is an explanatory view showing a conventional pickup coil terminal housing process.

FIG. 4 is an explanatory view showing another terminal storing step of the conventional pickup coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Bobbin 12 Winding 12a Tip part 12b Termination part 13 Winding part 14,15 Flange part 16 Cylindrical part 21,31 Terminal 21a, 31a Connection part 100 Pickup sensor

Claims (3)

[Claims] 1. A bobbin on which a winding is wound around a winding body having flanges at both ends, a cylindrical portion having one flange extended outward in the axial direction of the bobbin, and a bobbin disposed on the outer periphery of the cylindrical portion. And a pair of rod-shaped terminals each having an L-shaped connection portion to which a leading end or a trailing end of the winding is electrically connected, wherein the terminals rotate in the axial direction of the bobbin. A pickup coil, which is freely supported, and in which the connection portion connected to the winding is freely housed in a circumferential direction of the cylindrical portion. 2. The pickup coil according to claim 1, wherein the connection portions of the pair of terminals are respectively housed in a loosening direction of the winding. 3. A bobbin in which a winding is wound around a winding drum having flanges at both ends and an iron core is inserted, and one flange is extended outward in the axial direction of the bobbin. A cylindrical part having a built-in permanent magnet that is in close contact with the cylindrical part, and a rod-shaped part having an L-shaped connection part disposed on the outer periphery of the cylindrical part and electrically connected to a leading end or a terminal end of the winding. A pair of terminals which are rotatably supported in parallel with the axial direction of the bobbin, and wherein the connection part connected to the winding is capable of being housed in the circumferential direction of the cylindrical part, corresponding to the rotation of the rotating body. And detecting a rotation state of the rotating body based on an induced electromotive force generated in the winding.