JPH02291983A - Rotation detector - Google Patents

Abstract

PURPOSE:To simplify a construction while preventing a short circuiting of a coil wire by deforming a rubber ring flat between a holding section of a coil bobbin and an internal wall surface of a case to seal the coil wire from outside the case. CONSTITUTION:A metal case 1 is opened at the top thereof, a coil bobbin 2 is provided inside the case and a portion between an outer wall and an internal wall of the case 1 is sealed airtight with a rubber ring R as elastic seal member. A core 3 is mounted at the center of the bobbin 2 while a lead 4 for external connection extending upward from the bobbin 2 is led upward outside the case 1. A flange section 5 is formed at an upper end rim part of the case 1 and clips 6 are caulked at four points K1-K4 on the flange section 5. An epoxy resin 7 is sealed within the case 1 to seal up the bobbin 2 from above, thereby preventing water or the like from infiltrating into the case 1.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a rotation detector.

[Prior Art] For example, a rotation detector used in a swash plate compressor is placed adjacent to a temporary rotation locus made of a magnetic material, and this rotation detector detects the magnetic flux generated from the swash plate. When the swash plate rotates, this magnetic change is converted into an electrical signal. When the swash plate does not rotate, that is, when the swash plate is locked, the compressor is cut off from the external power source by an electric signal from the coil wire, thereby protecting each member of the compressor.

As the above-mentioned rotation detector, the applicant of the present application has filed a patent application in 1983-
113886 is proposed.

That is, as shown in FIG. 12.13, the ends of the coil wire 42 wound around the coil bobbin 41 are connected to the first and second terminals 43 and 44 provided at the front and rear of the bobbin 41, and the ends of the coil wire 42 are connected to the first terminal 43. The coil wire 42 and the lead wire 45 are electrically connected by connecting the lead wire 45. Then, after covering the front part of the bobbin 41 with the coil 142 and the cap 46, the through hole 47 of the insulating cap 46 is
The front part of the iron core 49 is inserted into the holding hole 48 formed from the rear part of the bobbin 41. Thereafter, the bobbin 41 is placed in a metal case 50, the rear part of the iron core 49 is accommodated in the accommodation recess 51 protruding from the bottom of the case 50, and the bobbin 41 is placed in the metal case 50.
The front and rear ends of the iron core 49 are respectively supported by the end wall of the holding hole 48 and the inner bottom surface of the case 50 to determine the position of the iron core 49.

Further, as shown in FIG. 14, a chrysobacter 52 is fixed to the front opening of the case 50, and then the opening is filled with epoxy resin 53 to seal the bobbin 41, and the first The O-ring 54 prevents dew condensation from forming at the connection portion between the terminal 43 and the lead wire 45, and also seals between the inner circumferential wall of the case 50 and the outer circumferential wall of the bobbin 41.
Due to this, water etc. enters into the insulating cap 46 and the coiled cotton 4
2, condensation is prevented from forming, short circuits are prevented, and rotation of the swash plate is accurately detected. '[Problem to be Solved by the Invention] However, since the iron core 49 is exposed within the insulating cassop 46, there is a risk that the second terminal 44 may come into contact with the iron core 49, which may cause a short circuit of the coil wire 42 as described above. will be invited.

In addition, the O-ring 54 for sealing is provided with double flanges 56 at the front of the bobbin 41, and a groove 5 between these flanges 56 is provided.
Since the bobbin 54 is formed horizontally so that it can be inserted into the bobbin 54, the structure of the bobbin 54 becomes complicated and manufacturing is complicated. This invention was made in order to solve the above-mentioned problems, and its purpose is to provide a rotation detector that reliably prevents short-circuiting of coil wires and has a simplified configuration and is easy to manufacture. be.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the present invention provides a method in which a coil bobbin around which a coil wire is wound is covered with an insulating cap, and an iron core extending through the insulating cap is attached. The coil bobbin is stored in a case, and the lead wire introduced from outside the case is connected to the end surface of the coil bobbin. ! ! a rotation detector connected to the coil wire via a terminal protruding into the edge cap, the positioning portion aligning with the inner wall surface of the case on the outer peripheral surface of the coil bobbin and holding the coil bobbin in a predetermined position within the case; a holding portion that holds an elastic sealing member that is deformed between the outer circumferential surface of the coil bobbin held in the predetermined position and the inner wall surface of the opposing case to seal the coil wire from the outside of the case; Coupling pieces dotted around the inner circumferential edge of the edge cap and used to attach the insulating cap to the coil bobbin by being attached to engagement parts recessed on the outer circumferential surface of the coil bobbin, and bonding pieces that surround the circumferential surface of the iron core, The gist is that a contact prevention part extending between the insulating cap and the coil bobbin is provided to prevent contact between the cap and the terminal. [Function] By adopting the above-described means, the elastic sealing member is flattened between the coil bobbin holding portion held in a predetermined position by the positioning portion and the corresponding inner wall surface of the case. It is deformed to seal the coil wire from the outside of the case.

Also, when the insulation cap is attached to the coil bobbin,
The bonding piece minimizes the contact area of the inner peripheral edge of the insulating cap with the coil wire.

In addition, a contact prevention portion surrounding the iron core between the insulating cap and the coil bobbin prevents the terminal from coming into contact with the iron core.

[Example] Hereinafter, an example in which the present invention is embodied in a rotation detector for a swash plate compressor will be described in detail with reference to FIGS. 1 to 11.

In FIG. 1, a metal case 1 has an open top, a coil bobbin 2 is disposed inside the metal case 1, and a space between the outer wall of the metal case 1 and the inner wall of the case 1 is airtightly sealed by a rubber ring R serving as an elastic sealing member. ing. Further, an iron core 3 is attached to the center of the bobbin 2, and an external connection lead wire 4 extending upward from the bobbin 2 is led out from the case 1 upwardly and outwardly. In particular, as shown in FIG. 2, a flange portion 5 is formed at the upper edge of the case l, and clips 6 are caulked to the flange portion 5 at four points Kl to K4. Further, as shown in FIG. 1, the case 1 is filled with epoxy resin 7, and the bobbin 2
is sealed from above to prevent moisture and the like from entering the case 1.

As shown in FIG. 3, the upper part of the metal case 1 is formed with two step portions 8a and 9a that have a smaller diameter toward the bottom.
A large-diameter matching section 8 is provided at the upper stage, and a small-diameter seal section 9 is provided below the matching section 8 . Further, in the case 1, an iron core accommodating part 10 is formed as a detection bottom part in the shape of a bottomed cylinder that protrudes downward from the center of the bottom part through the bobbin accommodating part 1a.

As shown in Figure 1.4, the bobbin 2 has a bobbin main payload 1.
1 is covered with an insulating cap l2,
As shown in FIG. 1.5, the upper part of the head part l3 of the zero body 11 has a large diameter part l4 as a positioning part corresponding to the matching part 8 of the case 1, and the lower part of the large diameter part 14 has a medium diameter part l4. A portion 15 is formed.

Further, the case 1 is provided below the middle diameter portion 15 of the main body 11.
A small diameter portion 17 is formed at a position corresponding to the seal portion 9 of the rubber ring R through a holding portion l6 for fitting onto the outer surface of the rubber ring. Arrival 18 is provided. The small diameter portion 17 of the main body 11 is a winding portion 19 having a vertically elongated cylindrical shape.
The coil I! is connected to the lower flange portion 20 via the small diameter portion 17 and the flange portion 20, and the coil I! tIA21 is wound.

A concave portion 11a is opened in the upper surface of the large diameter portion 14 of the main body 1l, and a small diameter portion l7, a winding portion 19 and a flange portion 2 are formed.
The upper end portions of the pair of conductive members 22 extending vertically through the flange 20 have a first terminal 23 projecting into the recess 11a, and the lower end portions of the conductive members 22 have a second terminal 24 projecting downward from the flange portion 20. It consists of As shown in FIG. 6, the coil wire 2 is drawn out from a pair of notches 25 facing each other in the circumferential direction of the flange portion 20.
Both ends of l are soldered to the second terminals 24, respectively.

Further, as shown in FIG. 7.8, the first terminal 23 includes a receiving piece 26 extending in the horizontal direction and a locking piece 27 extending continuously from the upper end surface of the receiving piece 26 on one end side. formed,
A lead wire hooking portion 28 is provided on the inner peripheral edge of the proximal end of the locking piece 27 and is recessed in a substantially semicircular shape. As shown in FIG. 9, a core wire 30 bent into a U-shape at the tip of the lead vA4 is hooked into the hook 28.
The core '4lA30 is held by the locking piece 27 bent into the receiving piece 269A by a jig.

In addition, as particularly shown in FIG. 4, an insertion recess 3l for inserting the iron core 3 is formed in the first turn part 19 from the center of the flange part 20 of the main body 11 so as to extend upward;
A movement prevention member 32 made of an elastic material (sponge rubber in this embodiment) is adhesively fixed to the upper end wall 31a.

As shown in FIG. 10, a pair of tongue-shaped joining pieces 33 are formed at positions facing each other in the radial direction on the inner peripheral edge of the upper opening of the insulating cap 12, and these joining pieces 33 form the main body. The insulating cassop 12 is attached to the null body l1 by being fitted and locked into the fitting groove l8 of the insulating cassop 11. An insertion hole 34 having the same diameter as the insertion recess 3l of the main body 11 is formed in the center of the lower end of the bulge cap 12, and an insulating cylindrical portion 35 as a cylindrical contact prevention portion is provided at the inner peripheral edge of the cap. 12 so as to protrude upward. The iron core 3 extending from the bobbin insertion recess 3l passes through the insulating cylindrical portion 35 and extends downward. Further, on the inner circumferential surface of the insulating cylindrical portion 35, three holding protrusions 36 are formed at equal intervals in the circumferential direction, extending from the center in the vertical direction to the upper end, and these protrusions protrude toward the center as they move upward. There is. As shown in FIG. 1, when the bobbin 2 is placed in the case 1, the insertion hole 34 and the accommodating part 10 are aligned, and from the upper end wall 31a of the insertion recess 31 to the inner bottom surface of the accommodating part 10. The total length of the iron core 3 is set to be slightly larger than the length of the iron core 3. Then, the insertion recess 3l and the insulating cylinder part 35
The upper end surface of the iron core 3 is pressed against the movement prevention member 32 in the housing portion 10, so that the iron core 3 is held in a fixed state. Also, the large diameter portion I4 of bobbin 2 is connected to case 1.
When the bobbin 2 is correctly fitted into the alignment part 8 of
The dimensions and shapes of the bobbin 2 and the case 1 are set so that a space smaller than the cross-sectional shape of the rubber ring R fitted onto the holding part 16 is formed between the holding part 16 and the seal part 9 of the case 1. has been done.

Now, a method of assembling the rotation detector configured as described above will be explained.

First, insert the insulating cap l2 into the fitting groove 18 of the bobbin body 1l.
After fitting the joining piece 33 and covering the cap 12 on the main body 11, the rubber ring R is fitted onto the holding part 16. Then, the iron core 3 is pushed into the insertion hole 34 of the cap 12. Then, the iron core 3 is attached to the holding protrusion 3 in the insulating cylindrical portion 35.
By pressing 6 in the radial direction, the same momme-colored edge cylindrical portion 35
The insertion recess 31 of the main body 1l is enlarged upwardly.
go inside.

Then, the iron core 3 is raised within the insertion recess 3l until its upper end surface abuts the upper end wall 31a via the movement prevention member 32, and the raising is stopped with its lower part protruding downward from the bobbin 2. Thereafter, the bobbin 2 is rearranged within the case 1 so that the lower part of the core 3 is accommodated in the housing section 10 of the case 1, and the core 3 is held within the insertion recess 31 and the housing section 10.

At this time, the rubber ring R fitted onto the holding portion 16 of the bobbin 2 comes into contact with the lower stepped portion 9a of the case 1, and moves relatively upward as the bobbin 2 moves downward. When the large diameter portion 14 of the bobbin 2 comes into contact with the matching portion 8 of the case 1, the bobbin 2
The rubber ring R formed based on the vertical position of case 1
In the narrow gap between the seat part 9 and the holding part 16, both 9
, 16 to deform into a flat shape, and the clip 6 is caulked to the flange portion 5 of the case 1 to seal these wall surfaces.

Next, the locking piece 27 of the first terminal 23 is pressed with a jig and bent toward the receiving piece 26 side, so that the core wire 30 of the lead wire 4 disposed in the locking part 28 and the first terminal 23 are bent. Connect with. After this, the epoxy resin 7 is injected into the case 1 from above, filled in the upper part of the case 1 and the recess 11a of the zero body 11, and solidified. After sealing the bobbin 2, the rotation detector is assembled. end.

The rotation detector configured in this manner is placed adjacent to the rotation locus of the swash plate made of a magnetic material in the swash plate compressor, and the swash plate, which apparently swings as it rotates, approaches the detector. When separating, the change in magnetic flux passing through the iron core 3 is measured by the coil wire 2.
l converts it into an electrical signal. When the swash plate is locked, the compressor is cut off from the external power source by an electric signal transmitted from the coil wire 2l to the outside via the lead wire 4 based on the abnormality of the magnetic field, and the compressor is protected. It will be done.

As described above, the matching part 8 is formed inside the metal case 1, and the large diameter part 14 of the bobbin main amount 1l is formed in a shape and size corresponding to the matching part 8. By configuring the portion l4 to fit into the alignment portion 8, the bobbin 2 is reliably positioned relative to the case 1. For this reason, the seal portion 9 of case l and the bobbin 2
A narrow space that exactly matches the preset dimensions and shape is created between the holding part 16 and the holding part 16, and within this space, the rubber ring R fitted onto the holding part 16 is sandwiched between the holding part 16 and the sealing part 9. The inner wall of the case l and the outer wall of the zero body 11 are sealed.

Therefore, the path of outside air and moisture passing through the gap between the flange portion 5 of the case 1 and the clip 6 is completely blocked by the rubber ring R, and dew condensation occurs on the coil vA21 within the insulating cap 12. This prevents short circuits from occurring. Therefore, unlike conventional products, there is no need to carve a groove in the main body 1l for mounting the rubber ring R, contributing to the simplification of the configuration of the present detector.

Furthermore, when the insulating cap 12 is attached to the blank body l1, a pair of joining pieces 33 are inserted into the sleeping groove 18 of the body l1.
It remains in sliding contact. Therefore, the possibility that the coil wire 21 will break is drastically reduced.

In addition, the bobbin body 1l is fitted around the entire circumference.
18, and a pair of joining pieces 33 are provided protruding from the upper peripheral edge of the insulating cap 12, and by engaging these joining pieces 33 into the fitting groove 18, the insulating cap 12 can be attached to the zero body 1.
It is configured to be attached to 1. As a result, if the joining piece 33 is fitted into any part of the fitting groove 18, the insulating cap 1
2 can be attached to the bobbin body 1l, and the troublesome work of accurately aligning the insulating cap l2 with respect to the bobbin body 1l when attaching it can be avoided.

In addition, by configuring the insulating cylindrical portion 35 of the insulating cap 12 to cover the circumferential surface of the iron core 3, the second terminal 24 of the zero body 11
This prevents the iron core 3 from coming into contact with the iron core 3 and causing a short circuit.

Furthermore, the iron core 3 is held in a state in which its upper end is pressed by the movement prevention member 32 of the upper end wall 31a of the insertion recess 31, so that the iron core 3 is inserted into the housing part lO of the case 1 and the insertion recess 31 of the bobbin 2. It does not move vertically within the gap inside the . Further, since the iron core 3 is held between the holding protrusions 36 on the inner peripheral surface of the insulating cylindrical portion 35 of the insulating cap 12, movement of the iron core 3 in the lateral direction is prevented. Therefore, when vibrations are transmitted from the compressor to the rotation detector, the iron core 3 is prevented from moving slightly, and the iron core 3 is held in a predetermined position within the detector, so that a magnetic field is always generated in a certain range. , there is no problem in detecting the rotation of the swash plate.

Note that it is also possible to prevent vertical and horizontal movement of the iron core 3 by using only one of the movement prevention member 32 or the holding protrusion 36.

[Effects] As detailed above, according to the rotation detector of the present invention,
It has excellent effects in that it reliably prevents short circuits in the coil wire, and also simplifies the configuration and facilitates manufacturing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a rotation detector according to the present invention, and FIG.
The figure is a plan view of Fig. 1, Fig. 3 is a sectional view showing the metal case, Fig. 4 is a sectional view showing the coil bobbin, Fig. 5 is a sectional view showing the bobbin body, and Fig. 6 shows the coil bobbin together with the iron core. An exploded perspective view, FIG. 7 is a perspective view showing the bobbin body,
Figures 8 and 9 are perspective views showing the 1st X element before and after lead wires are attached, respectively, Figure 10 is a perspective view showing the insulating cap, and Figure 11 is an enlarged view of the main part of Figure 10. FIG. 12 is an exploded perspective view showing a conventional example, FIG. 13 is a perspective view similarly showing a conventional example, and FIG. 14 is a sectional view showing a conventional example. Case l, coil bobbin 2, iron core 3, lead wire 4, insulation carrier. 2, a large diameter portion 14 as a positioning portion, a holding portion 16, a coil wire 21, a terminal 24, a joining piece 33, an insulating cylinder portion 35 as a contact prevention portion, and a rubber ring R as an elastic sealing member. Figure 34' Figure 111

Claims (1)

[Claims] 1. A coil bobbin with a coil wire wound thereon is covered with an insulating cap, and a coil bobbin with an iron core extending through the insulating cap is housed in a case, and a lead wire extending outside the case is attached to the coil bobbin. A rotation detector connected to a coil wire via a terminal protruding into an insulating cap from an end face, the rotation detector having a positioning mechanism that aligns the outer peripheral surface of the coil bobbin with the inner wall surface of the case and holds the coil bobbin at a predetermined position within the case. a holding portion that holds an elastic sealing member that is deformed between the outer peripheral surface of the coil bobbin held at the predetermined position and the inner wall surface of the opposing case to seal the coil wire from the outside of the case; Coupling pieces dotted around the inner circumferential edge of the insulating cap and inserted into engagement parts recessed in the outer circumferential surface of the coil bobbin to attach the insulating cap to the coil bobbin; and a contact prevention part extending between the insulating cap and the coil bobbin to prevent contact with the terminal.