JP5394150B2 - Inductance type rotation angle sensor and manufacturing method thereof - Google Patents

Description

  The present invention includes a rotor attached to a rotating body to be detected and a stator attached to a non-rotating control housing, and the stator is formed in an annular shape and a receiving element disposed adjacent to the exciting conductor. The conductor is printed on a substrate made of glass epoxy resin, and an excitation conductor opposite to the excitation conductor is attached to the rotor, and the change in the inductance of the excitation conductor accompanying the rotation of the excitation conductor is The present invention relates to an inductance type rotation angle sensor that detects a change in rotation angle from a receiving conductor and a method for manufacturing the same.

  Such an inductance type rotation angle sensor is known as disclosed in Patent Document 1.

JP 2008-96231 A

  In such an inductance-type rotation angle sensor, it is important to make the gap between the stator excitation conductor and the reception conductor and the rotor excitation conductor as narrow and stable as possible in order to improve the detection accuracy of the angle change of the rotating body. However, in the glass epoxy resin substrate on which the excitation conductor and the receiving conductor are printed, the linear expansion coefficient is extremely small in the plate surface direction due to the direction of the glass fiber inside, but the linear expansion coefficient is relatively small in the plate thickness direction. Due to its large size, when using an inductance rotation angle sensor in an environment where the temperature changes drastically, such as around the engine, the opposing gap changes due to a change in the board thickness, and the detection accuracy of the angle change of the rotating body decreases. There are things to do. However, in the conventional inductance type rotation angle sensor, in reality, little consideration has been given to preventing changes in the board thickness caused by temperature changes.

  The present invention has been made in view of such circumstances, and provides an inductance-type rotation angle sensor capable of suppressing the change in the thickness of the substrate due to a temperature change and stabilizing the detection accuracy of the angle change of the rotating body. An object of the present invention is to provide a method for manufacturing the rotation angle sensor.

To achieve the above object, the present invention provides a stator attached to a non-rotating control housing comprising a rotor attached to a rotating body to be detected, a housing body and a housing cover joined to an open surface of the housing body. The stator is formed by printing a ring-shaped exciting conductor and a receiving conductor arranged adjacent to the exciting conductor on a substrate made of glass epoxy resin, while the rotor faces the exciting conductor. In an inductance type rotation angle sensor that detects a change in inductance of an excitation conductor accompanying rotation of the excitation conductor from a receiving conductor as a change in rotation angle of the rotating body, both of the front and back surfaces of the substrate perimeter of the substrate and, to be Kutsugaeso you connected to each other through a through hole which the substrate has, in the substrate thickness direction of the A thermosetting resin having a thermal expansion coefficient smaller linear expansion coefficient as well as the mold form, of the coating layer, a portion that covers the excitation conductors and the reception conductors, the wall thickness is formed in a thin walled portion than other portions The first feature is that the thin portion is exposed and the stator is embedded in the housing cover made of thermoplastic resin. Incidentally, the rotation angle sensor corresponds to the throttle opening sensor 22 in the embodiment of the present invention to be described later, also the rotating body that corresponds to the throttle valve 3.

Furthermore, in addition to the first feature, the present invention connects a plurality of bus bars each having one end portion as a coupler terminal to the bus bar connection portion on the substrate, and embeds the bus bar connection portions in the coating layer. A first feature is that a coupler for holding a terminal is formed integrally with the housing cover .

Furthermore, the present invention is a method of manufacturing an inductance type rotational angle sensor according to the first feature, wherein the stator is set between a fixed mold and a movable mold for forming a coating layer, and is defined between the fixed mold and the movable mold. When forming a coating layer made of a thermosetting resin that covers both the front and back surfaces of the substrate by filling the formed cavity with a thermosetting resin, the plurality of bus bars are placed close to the outer edge of the substrate. The tie bars are integrally connected to each other through the tie bars, and the bus bars located on the outermost side are formed with ears protruding outward alongside the tie bars, while the bus bars, tie bars and ears are loosely accommodated. the holding grooves previously formed on one of the fixed mold and the movable mold, when sets the stator between the fixed mold and the movable mold was closed dies, is in close contact with both mold both sides of the bus bar and tie bar And crushing the ears to fill the gaps between the ears and the inner surface of the holding groove facing the ears, and then filling the cavity with a thermosetting resin, A third feature is that the resin flowing out from the cavity into the holding groove is blocked by the tie bar and the ear. The tie bar corresponds to a first tie bar 36 in an embodiment of the present invention described later.

Furthermore, the present invention is a method of manufacturing an inductance type rotational angle sensor according to the first feature, wherein the stator is set between a fixed mold and a movable mold for forming a coating layer, and is defined between the fixed mold and the movable mold. In forming a coating layer made of a thermosetting resin that covers both the front and back surfaces of the substrate by filling the formed cavities with a thermosetting resin, the outer surfaces of the plurality of bus bars are formed on the outer surfaces of the substrate. A pair of ears projecting in the arrangement direction of the bus bars are projected at locations close to the outer edge, and a holding groove for loosely accommodating the bus bars and the ears is formed in one of the fixed type and the movable type. when closing the dies to set between the fixed mold and the movable mold the stator, the both types together is brought into close contact with both sides of the bus bar, by crushing the ear, and their ears, each of said retaining Between the inner surface of the groove Fills a gap, then when filled with a thermosetting resin in the cavity and that of blocking resin flowing out to the holding groove from the cavity by the ears and the fourth characteristic.

  According to the first feature of the present invention, the thermosetting resin coating layers on the front and back sides of the substrate can cooperate to suppress thermal expansion in the thickness direction of the substrate. In addition, in the coating layer, the thin part covering the exciting conductor is thinner than the other parts, so that the gap between the exciting conductor and the exciting conductor of the rotor can be narrowed, and the stator temperature can also be reduced by changing the environmental temperature. A change in the facing gap between the exciting conductor and the exciting conductor of the rotor can be eliminated or minimized, and the rotational angle detection accuracy of the inductance type rotational angle sensor can be increased and stabilized.

In addition, the thermal expansion in the board thickness direction of the substrate is further effectively suppressed by molding the coating layer with a thermosetting resin whose linear expansion coefficient is smaller than the linear expansion coefficient in the board thickness direction of the glass epoxy resin of the board. can do.

According to the second feature of the present invention, the connection portion between the bus bar and the substrate having one end as a coupler terminal is embedded in the coating layer, so that the connection between the bus bar and the substrate due to infiltration of moisture or the bus bar mutual. it is possible to prevent the short-circuit, moreover it is possible to simultaneously hold the substrate and the coupler pin and molding of housings cover, it is possible to simplify the structure.

According to the third aspect of the present invention, when the cavity is filled with the thermosetting resin, even if it flows out as a burr in the gap between the base of each bus bar and the inner surface of each holding groove, it is heard. The tie bar with a portion can be dammed, so that the thermosetting resin can be prevented from flowing out from the tie bar and the formation of burrs can be minimized.

According to the fourth feature of the present invention, when the thermosetting resin is filled into the cavity, the thermosetting resin that has flowed out of the cavity into the base gap of each bus bar can be blocked by the ears, Formation can be minimized.

1 is a sectional view of an intake control device for an engine including a throttle opening sensor embodying the present invention. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. The housing cover inner side view of the control housing in FIG. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. The top view which shows the stator in FIG. 3 in the fracture | rupture state of a coating layer. The top view which shows the state which set the stator to the metal mold | die for coating layer shaping | molding at the time of shaping | molding the coating layer to the said stator. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7, (A) shows a state where the mold is opened, and (B) shows a state where the mold is closed. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 7, (A) shows a state in which the mold is opened, and (B) shows a state in which the mold is closed. FIG. 10 is a cross-sectional view taken along the line 10-10 in FIG. 7, (A) shows a state in which the mold is opened, and (B) shows a state in which the mold is closed. The top view of the stator immediately after coating layer shaping | molding. Shows another method of forming the coating layer to the stator, a plan view corresponding to FIG. 7. The top view which shows the state which carried out. 13A and 13B are cross-sectional views taken along line 13-13 of FIG. 12, in which (A) shows a state in which the mold is opened, and (B) shows a state in which the mold is closed.

  Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings.

  1 and 2, a throttle body 1 is attached by a plurality of bolts 7 to an intake manifold M of a vehicle engine such as a motorcycle or an automobile. The throttle body 1 includes an intake cylinder 1a having an intake passage 2 on the inside, and a control housing 1b provided continuously from one side in the horizontal direction to the lower part of the intake cylinder 1a. A throttle valve 3 for opening and closing the intake passage 2 is attached to the intake cylinder 1a by rotatably supporting the valve shaft 3a on the left and right side walls of the intake cylinder 1a via bearings 4 and 5.

  A cap 6 that covers the outer end of the right end portion of the valve shaft 3 a and the bearing 5 is fitted to the right side wall of the throttle body 1. The left end portion of the valve shaft 3 a protrudes outward from the left side wall of the throttle body 1, and an electric motor 8 for driving the throttle valve 3 to open and close is connected to the protruding end portion via a reduction gear mechanism 9. .

  The reduction gear mechanism 9 includes a primary drive gear 11 fixed to the output shaft 10 of the electric motor 8, a primary driven gear 12 that is rotatably supported by the intermediate shaft 15 and meshes with the primary drive gear 11, and this primary A secondary drive gear 13 integrally formed on one side of the driven gear 12 and a sector type secondary driven gear 14 fixed to the left end portion of the valve shaft 3a and meshing with the secondary drive gear 13 are provided. The rotation of the output shaft 10 of the motor 8 is decelerated in two steps and transmitted to the valve shaft 3a so that the throttle valve 3 can be opened and closed. Each gear of the reduction gear mechanism 9 is a spur gear, and the valve shaft 3a, the output shaft 10 and the intermediate shaft 15 are arranged so that their axis lines are perpendicular to the axis line of the intake passage 2 and are parallel to each other. The secondary driven gear 14 is connected to a closing spring 17 made of a torsion coil spring that urges the secondary driven gear 14 in the closing direction of the throttle valve 3.

  The control housing 1b includes a housing body 19 formed integrally with the intake cylinder 1a, and a synthetic resin housing cover 20 joined to the open surface of the housing body 19 by a plurality of screws 35. The joint surfaces of the housing body 19 and the housing cover 20 are orthogonal to the axis of the valve shaft 3a, and a seal member 21 is interposed between the joint surfaces. The electric motor 8 is accommodated in the lower part of the housing body 19, the reduction gear mechanism 9 is accommodated in the housing cover 20 to the housing body 19, and the intermediate shaft 15 is supported at both ends by the housing body 19 and the housing cover 20. Is supported.

  Between the valve shaft 3a of the throttle valve 3 and the housing cover 20, an inductance type throttle opening sensor 22 for detecting the opening of the throttle valve 3 is configured. The configuration of the throttle opening sensor 22 and its peripheral part will be described with reference to FIGS.

  In FIG. 1, a screw shaft 3b having a smaller diameter is integrally connected to the left end portion of the valve shaft 3a via an annular step portion 3c. On the other hand, the boss of the secondary driven gear 14 made of synthetic resin is provided with a metal annular mounting plate 14a embedded and integrated on the inner peripheral side thereof, and the screw shaft 3b is attached to the mounting plate 14a. Then, the mounting plate 14a is clamped and fixed between the annular step 3c and the nut 23 by screwing and tightening the socket nut 23 to the tip of the screw shaft 3b. A rotor 23 made of synthetic resin for the throttle opening sensor 22 is fixed to the outer periphery of the outer end of the socket nut 23, and an excitation conductor 24 is disposed on the outer end of the rotor 23.

  As shown in FIGS. 1 and 3 to 6, the stator 25 of the throttle opening sensor 22 includes an annular excitation conductor 27 on the surface of a glass epoxy resin substrate 26 and an annular reception arranged adjacent to the inside. The conductor 28 is printed and a pair of microcomputers 29 and 29 'are mounted on the back surface thereof, and the excitation conductor 27 is disposed opposite the excitation conductor 24 of the rotor 23 with a gap. . Thus, a current is supplied from the power source to the exciting conductor 27, and a three-phase alternating current waveform is generated on the receiving conductor 28 due to a change in the inductance of the exciting conductor 27 accompanying the rotation of the exciting conductor 24 of the rotor 23. The computers 29, 29 ′ process the alternating current waveform, and output a signal corresponding to the rotation angle of the valve shaft 3 a to which the rotor 23 is attached, that is, the opening degree of the throttle valve 3, to control the operation of the electric motor 8. Output to a control unit (not shown).

  Four bus bars 30a to 30d projecting along the outer periphery of the substrate 26 are soldered to the bus bar connection portions 33a to 33d that are intensively arranged at one corner of the substrate 26, and these bus bars 30a to 30d are soldered. Are formed at the coupler terminals 31a to 31d. Among these coupler terminals 31a to 31d, the two wires 31a and 31c are used for connection to the power source, and the remaining two wires 31b and 31d are used for extracting the rotation angle signal.

  On both the front and back surfaces of the substrate 26, there are coating layers 32 made of a thermosetting resin that are connected to each other through the peripheral portion of the substrate 26, through holes 34 (see FIGS. 3 and 4), and a number of through holes for inserting conductive wires. In the covering layer 32, all of the excitation conductor 27, the reception conductor 28, the microcomputers 29 and 29 ', and the connection portions of the bus bars 30a to 30d with the substrate 26 are embedded. As a result, poor connection of wiring on the substrate 26 and electrical short-circuiting due to moisture intrusion can be prevented. At this time, a portion of the covering layer 32 that covers the exciting conductor 27 and the receiving conductor 28 is formed in a thin portion 32a that is thinner than other portions.

  Further, connecting the coating layers 32 on the front and back sides of the substrate 26 through the through holes 34 of the substrate 26 means that the coating layers 32 on the front and back sides of the substrate 26 are integrally connected by the thermosetting resin filled in the through holes 34. is there. The through hole 34 is provided at the center of the exciting conductor 27 and the receiving conductor 28.

  The stator 25 having the substrate 26 thus formed with the covering layer 32 is embedded in the housing cover 20 at the time of molding the housing cover 20 made of thermoplastic resin. At this time, the thin portion 32 a In order to make the excitation conductor 27 face the excitation conductor 24 of the rotor across the coil, it is placed in a state exposed from the housing cover 20. The housing cover 20 is integrally formed with a coupler 20a that houses and holds coupler terminals 31a to 31d formed at the ends of the bus bars 30a to 30d and power feeding coupler terminals 52a and 52b of the electric motor 8. . Accordingly, the substrate 26 and the coupler terminals 31a to 31d can be held simultaneously with the molding of the housing cover 20, and the structure can be simplified.

  As the glass epoxy resin constituting the substrate 26, a material having a linear expansion coefficient of 12 to 14 PPM / degree in the plate surface direction and 35 PPM / degree in the plate thickness direction is used. As described above, the linear expansion coefficient of the glass epoxy resin of the substrate 26 is small in the plate surface direction and large in the plate thickness direction. When the substrate 26 is molded, the glass fiber combined with the epoxy resin is in the surface direction of the substrate 26. This is due to the orientation.

  On the other hand, as the thermosetting resin as the constituent material of the coating layer 32, one having a linear expansion coefficient of 16 PPM / degree is used. That is, it is important that the thermosetting resin of the coating layer 32 has a smaller linear expansion coefficient than the linear expansion coefficient in the plate thickness direction of the glass epoxy resin of the substrate 26.

  Thus, the thermosetting resin coating layers 32 that are connected to each other through the peripheral portion of the substrate 26 and the through holes 34 are molded on the front and back of the substrate 26 made of glass epoxy resin. The coating layer 32 made of thermosetting resin can cooperate to suppress thermal expansion of the substrate 26 in the thickness direction.

  In particular, by forming the coating layer 32 with a thermosetting resin having a linear expansion coefficient smaller than the linear expansion coefficient in the plate thickness direction of the glass epoxy resin of the substrate 26, the thermal expansion in the plate thickness direction of the substrate 26 is more effective. Can be suppressed. In addition, in the coating layer 32, the thin portion 32a covering the excitation conductor 27 and the reception conductor 28 is thinner than the other portions, so that the facing gap between the excitation conductor 27 and the reception conductor 28 and the excitation conductor 24 of the rotor 23 is narrowed. In addition, even if the temperature of the environment changes, the change in the gap between the exciting conductor 27 of the stator 25 and the exciting conductor 24 of the rotor 23 can be eliminated or minimized. The degree of opening detection accuracy can be increased and stabilized. Further, since the through hole 34 of the substrate 26 is provided at the center of the exciting conductor 27 covered with the thin portion 32a of the covering layer 32, the thin portion 32a is effectively formed by the thermosetting resin filled in the through hole 34. Therefore, thermal expansion in the plate thickness direction of the substrate 26 around the exciting conductor 27 can also be suppressed by the thin portion 32a.

Next, a method for manufacturing the stator 25 will be described with reference to FIGS.
[1] Assembly of stator 25 (see FIG. 7)
First, an exciting conductor 27 formed in an annular shape and a receiving conductor 28 disposed adjacent to the inside are printed on one side surface of a substrate 26 made of glass epoxy resin, and a pair of microcomputers 29 and 29 'are mounted. To do. Substrate 26 has no square, preferably provided a positioning hole 41 in its three corners.

Next, four bus bars 30a to 30d having tip portions as coupler terminals 31a to 31d are prepared. These bus bars 30a to 30d are manufactured by punching from a conductive plate such as Al. At the time of manufacture, a plurality of bus bars 30a to 30d are arranged in a straight line so as to integrally connect the bus bars 30a to 30d with each other at a position close to the outer edge of the substrate 26. The first tie bar 36, a pair of ears 37, 37 that are aligned with the first tie bar 36 and project from the outer surface of the outermost bus bars 30a, 30d, and the coupler terminals 31a-31d are adjacent to each other. A plurality of second tie bars 38 arranged in a straight line so as to integrally connect the bus bars 30a to 30d are formed simultaneously. Then, the base end portions of the bus bars 30a to 30d are soldered to the bus bar connection portions 33a to 33d arranged at one corner of the substrate 26, and the assembly of the stator 25 is completed.
[2] Preparation for forming the coating layer 32 (see FIGS. 7 to 10)
As shown in FIGS. 7 and 8, the stator 25 is set between the fixed mold 40 a and the movable mold 40 b that constitute the coating layer forming mold 40. At that time, the positioning holes 41 provided at the three corners of the substrate 26 are fitted with the positioning pins 42 provided on the fixed mold 40a, and the peripheral portions of the positioning holes 41 are connected to the fixed mold 40a and the movable mold 40b. It is clamped by the provided presser bosses 43 and 44.

  On the other hand, as shown in FIGS. 7, 9 and 10, the four bus bars 30a to 30d, the ear portions 37 and 37, and the first and second tie bars 36 and 38 protruding from the substrate 26 are provided in the fixed mold 40a. The holding groove 15 is accommodated and pressed against the groove bottom side of the holding groove 15 by the pressing surface 46 of the movable mold 40b. Thus, the lower surfaces of the bus bars 30a to 30d, the ear portions 37 and 37, and the first and second tie bars 36 and 38 are in close contact with the fixed die 40a, and their upper surfaces are in close contact with the movable die 40b.

The holding groove 15 of the fixed mold 40a has both inner side surfaces inclined outward so that the bus bars 30a to 30d and the ears 37 and 37 can be easily accommodated and positioned. As a result, the inclination of each holding groove 15 is increased. A gap 48 is formed between the inner side surface and the outer side surfaces of the bus bars 30 a to 30 d and the ear portions 37 and 37. On the other hand, the movable mold 40b is formed with projections 49, 49 projecting toward the holding groove 15 at locations corresponding to the ear portions 37, 37. When the fixed and movable molds 40a, 40b are closed, these projections 49, 49 are formed. The protrusions 49 and 49 crush the ears 37 and 37 to fill a gap 48 between the outer surface of each ear 37 and 37 and the inclined inner surface of the holding groove 15 adjacent thereto (see FIG. 10 (B)).
[3] Molding of coating layer 32 (see FIG. 8B)
When the fixed mold 40a and the movable mold 40b are closed as described above, the cavity 50 is formed where both the front and back surfaces and the peripheral portion of the substrate 26, the exciting conductor 27, the receiving conductor 28, the microcomputers 29 and 29 ', and the like face. Thus, the depth of the portion corresponding to the exciting conductor 27 and the receiving conductor 28 of the cavity 50 is formed shallower than the depth of the other portions. The cavity 50 is filled with a thermosetting resin from a gate (not shown), thereby forming a coating layer 32 made of a thermosetting resin around the substrate 26 and filling the through holes 34 of the substrate 26 with the thermosetting resin. In addition, in the covering layer 32, a portion covering the exciting conductor 27 and the receiving conductor 28 is a thin portion 32a (see FIG. 4) having a thinner thickness than the other portions.

At that time, the thermosetting resin filled in the cavity 50 flows out as burrs into the gaps 48 between the base outer surfaces of the bus bars 30a to 30d and the inner surfaces of the holding grooves 15, but these bus bars 30a. ˜30d are integrally connected to each other via the first tie bar 36, and the ears 37, 37 located on the outermost side along with the first tie bar 36 are crushed as described above, so that these ears 37, Since the gaps on both sides of 37 are filled, the thermosetting resin that has flowed into the gaps 48 at the bases of the bus bars 30 a to 30 d can be blocked by the ear portions 37 and 37 and the first tie bar 36. Accordingly, it is possible to prevent the thermosetting resin from flowing out from the first tie bar 36 onward, and to minimize the formation of burrs.
[4] Cutting the first and second tie bars 36, 38 (see FIG. 6)
After forming the coating layer 32, the fixed mold 40a and the movable mold 40b are opened, the stator 25 is taken out, and the first and second tie bars 36 and 38, which have connected the bus bars 30a to 30d, are cut off by a press and the bus bars 30a to 30b. 30d is made independent, and the manufacture of the stator 25 is completed.
[ 5 ] Molding of housing cover 20 (see FIGS. 3 and 4)
When the housing cover 20 is molded with a thermoplastic resin, the stator 25 is set in a molding die (not shown), but the coating layer 32 has a thin wall covering the exciting conductor 27 and the receiving conductor 28. The part 32a is disposed outside the cavity for molding the housing cover. Thus, by molding the housing cover 20 with the thermoplastic resin, the stator 25 can be embedded in the housing cover 20 with the coupler 20a in a state where the thin portion 32a is exposed from the inner surface of the housing cover 20. The four coupler terminals 31a to 31d for the inductance type rotation angle sensor 22 and the two coupler terminals 52a and 52b for the electric motor 8 can be held by the coupler 20a.

  Next, another embodiment of the present invention shown in FIGS. 12 and 13 will be described.

  This another embodiment is different from the previous embodiment in the method for damming the thermosetting resin flowing out from the cavity 50 into the holding groove 15. That is, instead of the first tie bar 36, the plurality of bus bars 30a to 30d are formed with a pair of ears 37 and 37 protruding from the outer side surfaces, while the movable mold 40b of the coating layer molding die 40 is formed. Are formed with a plurality of projections 49, 49... Projecting toward the holding grooves 15 at locations corresponding to the ears 37, 37, and when the fixed and movable molds 40a, 40b are closed, The ears 37, 37... Are crushed by 49, 49... To fill the gaps between the ears 37, 37 and the inclined inner surface of the holding groove 15 adjacent thereto. By doing this, when the thermosetting resin is filled into the cavity 50, the thermosetting resin that has flowed out from the cavity 50 into the gap 48 at the base of each of the bus bars 30 a to 30 d can be blocked by the ear portions 37 and 37. , Burr formation can be minimized. Since other configurations are the same as those of the previous embodiment, portions corresponding to those of the previous embodiment are denoted by the same reference numerals in FIG. 12 and FIG.

  The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, the present invention can also be applied to a sensor that detects a change in the angle of a rotating body other than the throttle opening sensor 22.

1b: Control housing
DESCRIPTION OF SYMBOLS 19 ... Housing main body 20 ... Housing cover 20a ... Coupler 22 ... Rotation angle sensor (throttle opening sensor)
23 ... rotor 24 ... exciting conductor 25 ... stator 26a ... substrate 27 ... exciting conductor 28 ... receiving conductors 30a-30d ... bus bars 31a-31d ... coupler terminal 32 ... Coating layer 32a ··· Thin portions 33a to 33d ··· Bus bar connecting portion 34 ··· Through hole 36 ··· Tie bar (first tie bar)
37... Ear 40... Cover layer molding die 40 a... Fixed die 40 b... Movable die 45... Holding groove 48.

Claims (4)

A non-rotating control housing comprising a rotor (23) attached to a rotating body (3) to be detected, a housing body (19) and a housing cover (20) joined to an open surface of the housing body (19). 1b). The stator (25) includes an exciting conductor (27) formed in an annular shape and a receiving conductor (28) disposed adjacent to the exciting conductor (27). On the other hand, it is constructed by printing on a substrate (26) made of glass epoxy resin, and an excitation conductor (24) facing the excitation conductor (27) is attached to the rotor (23), and the excitation conductor (24) is rotated. In the inductance type rotation angle sensor for detecting the change in inductance of the exciting conductor (27) from the reception conductor (28) as the change in rotation angle of the rotating body (3),
On both sides of the substrate (26), the peripheral portion of the substrate (26) and, to be Kutsugaeso (32) you connected to each other through the through-holes the substrate (26) having (34), said substrate (26) A portion of the coating layer (32) covering the exciting conductor (27) and the receiving conductor (28) is molded with a thermosetting resin having a linear expansion coefficient smaller than the linear expansion coefficient in the plate thickness direction. Is formed into a thin part (32a) whose wall thickness is thinner than other parts,
The thin portion (32a) in the exposed state, inductive rotational angle sensor, characterized in that the stator (25) embedded in the thermoplastic resin of the housing cover (20). The inductance type rotation angle sensor according to claim 1,
A plurality of bus bars (30a to 30d) having one end as a coupler terminal (31a to 31d) are connected to the bus bar connecting portions (33a to 33d) on the substrate (26), and the bus bar connecting portions (33a to 33d) are connected. Embedded in the coating layer (32), and a coupler (20a) for holding the coupler terminals (31a to 31d) is formed integrally with the housing cover (20) . It is a manufacturing method of the inductance type rotation angle sensor according to claim 1,
The stator (25) is set between a fixed mold (40a) and a movable mold (40b) for forming a coating layer, and a cavity (50) defined between the fixed mold (40a) and the movable mold (40b) is formed. In forming a coating layer (32) made of a thermosetting resin that covers both the front and back surfaces of the substrate (26) by filling the thermosetting resin,
The plurality of bus bars (30a to 30d) are integrally connected to each other via a tie bar (36) at a position close to the outer edge of the substrate (26), and the outermost bus bars (30a, 30d). ) Along with the tie bar (36) are formed to protrude outwardly (37, 37), while the bus bar (30a-30d), tie bar (36) and ear (37, 37) are loosely accommodated. The holding groove (45) to be formed is formed in one of the fixed mold (40a) and the movable mold (40b), and the stator (25) is set between the fixed mold (40a) and the movable mold (40b) to form both molds. (40a, 40b) when closing, dies (40a, 40b) together is adhered to both sides of the bus bar (30 a to 30 d) and tie bars (36), crush and press the ear portions (37, 37) And those ears (37, 37) and the gap (48) between the inner surfaces of the holding grooves (45) facing the ears (37, 37) are filled, and then a thermosetting resin is filled in the cavity (50). Production of an inductance type rotation angle sensor characterized in that the resin flowing out from the cavity (50) into the holding groove (45) is blocked by the tie bar (36) and the ears (37, 37) when filled. Method. It is a manufacturing method of the inductance type rotation angle sensor according to claim 1,
The stator (25) is set between a fixed mold (40a) and a movable mold (40b) for forming a coating layer, and a cavity (50) defined between the fixed mold (40a) and the movable mold (40b) is formed. In forming a coating layer (32) made of a thermosetting resin that covers both the front and back surfaces of the substrate (26) by filling the thermosetting resin,
A pair of ears (37, 37) projecting in the direction in which the bus bars are arranged are provided on the outer side surfaces of the plurality of bus bars (30a to 30d) at locations close to the outer edge of the substrate (26). On the other hand, the bus bar (30a-30d) and the holding groove (45) for loosely receiving the ears (37, 37) are formed in one of the fixed mold (40a) and the movable mold (40b), and the stator ( 25) the fixed (40a) and a movable mold (40b) is set between and dies (40a, when closed 40b), on both surfaces of the dies (40a, 40b) of said bus bar (30 a to 30 d) And tightly crushing the ears (37, 37) to fill a gap (48) between the ears (37, 37) and the inner surface of each holding groove (45), then Fill the cavity (50) with thermosetting resin When in, characterized in that damming by its cavity the ears the resin flowing in the holding groove (45) from (50) (37) The method of inductive rotational angle sensor.

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