JP2011091964A - Sensor case and rotating electric machine using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sensor case capable of improving both production efficiency and its value as a product by firmly engaging a lead wire led from a lead-out hole of the bottom wall of an accommodating section to an engaging wall of an outer wall; and to provide a rotating electric machine using the sensor case. <P>SOLUTION: The lead wire 100a is led to the outside from the bottom wall 21 of a sensor case body, and is engaged with a support wall 24 which is protrusively provided on the outer surface of the bottom wall 21. A slit 25 cut from a protrusion end side toward a root side is provided on the support wall 24. The slit 25 has a small width portion 51 and an expanded width portion 52. A step difference portion 53 for restricting the displacement in a slip-off direction of the lead wire 100a is provided between the small width portion 51 and the expanded width portion 52. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sensor case for a sensor that detects the rotational position of a rotor, and a rotating electrical machine such as a motor or a generator that uses the sensor case.

A rotating electrical machine such as a starter generator of a vehicle is provided with a position detection sensor such as a Hall IC that detects the rotational position of the rotor, and the commutation timing of the three-phase coil based on the detection signal detected by the position detection sensor. Is to control.
In a position detection sensor used in this type of rotating electrical machine, a sensor element such as a Hall IC is housed in a sensor case together with a circuit board, and the sensor case is installed on the fixed part side of the rotating electrical machine.

  By the way, as a rotating electrical machine such as a starter generator of a vehicle, three drive sensor elements for detecting the commutation timing of three-phase coils of U, V, and W, and ignition for detecting the ignition timing of the engine. A device in which a timing sensor element and the like are housed in a sensor case together with a circuit board is known (for example, see Patent Document 1).

In a sensor case used in this rotating electrical machine, a concave housing portion is provided in a resin-made sensor case body, and a plurality of sensor elements are housed together with a circuit board in the housing portion. A plurality of lead wires are connected to the circuit board, and the lead wires are pulled out from the housing portion and connected to a control device for controlling the rotating electrical machine.
The accommodating portion accommodates each sensor element and the circuit board through the upper opening, and the lead wire of the circuit board is drawn out through the upper opening and then filled with a filler.

JP 2009-89588 A

  However, in this conventional sensor case, since the lead wire connected to the circuit board is drawn upward through the opening of the housing portion, when the liquid filler is filled in the housing portion, the filler has a plurality of lead wires. In order to avoid the suction of the filler due to the capillary phenomenon, the sensor case main body is inclined during the filling operation, for example, by the capillary phenomenon that passes through the container. May be.

  For this reason, it is currently under consideration to form a lead-out hole for pulling out the lead wire to the outside in the bottom wall of the housing part of the sensor case body, and to pull out the lead wire from the lead-out hole. In this case, it is desirable that the plurality of lead wires drawn out from the lead-out holes are locked in an aligned state on the outer surface side of the bottom wall of the housing portion. For this reason, as a countermeasure against this, consider locking the projecting wall on the outer surface of the bottom wall and forming a plurality of clamping slits on the locking wall to clamp the lead wires corresponding to the clamping slits. is doing.

  However, in the case of this countermeasure, if the holding slit has a constant width from the protruding end side of the locking wall toward the root portion side, the displacement of the lead wire is restricted in the direction intersecting with the cutting direction of the holding slit. This is advantageous, but it is disadvantageous in terms of displacement regulation in the direction along the clamping slit (the direction of withdrawal) compared to other directions.

  Therefore, the invention of this application makes it possible to firmly lock the lead wire drawn out from the drawing hole in the bottom wall of the housing portion to the locking wall on the outer surface of the bottom wall, thereby achieving both improvement in production efficiency and merchantability. An object of the present invention is to provide a sensor case that can be used and a rotating electrical machine using the same.

According to the first aspect of the present invention for solving the above-described problem, the sensor case main body is provided with a concave accommodating portion, and a circuit board electrically connected to the sensor element is accommodated in the accommodating portion. In the sensor case in which the lead wire connected to the substrate is pulled out from the housing portion, a lead-out hole for pulling out the lead wire to the outside is provided in the bottom wall of the housing portion, and the outer surface of the bottom wall A support wall for locking the lead wire is provided on the support wall, and the support wall is provided with a holding slit that is cut from the protruding end side toward the root portion side, and the holding wall includes the support wall. A narrow portion located near the projecting end of the first and second wide portions and a wide portion located near the base portion of the support wall. Between the lead wires Wherein the step portion for restricting is provided.
As a result, the lead wire pulled out from the lead-out hole is pushed from the narrow width portion side of the holding slit toward the wide width portion, and the displacement in the pulling direction is regulated by the step portion while being accommodated in the wide width portion. become.

According to a second aspect of the present invention, in the sensor case according to the first aspect, the bottom wall of the accommodating portion is provided with a through hole that faces the widened portion.
As a result, when the sensor case body is molded, the tip of the molding pin that forms the through hole is clamped on the base side of the support wall by installing the molding pin that forms the through hole in the molding die. The widened portion of the slit will be modeled.

According to a third aspect of the present invention, in the sensor case according to the second aspect, the support wall is extended on an extension of the peripheral wall of the housing portion with the bottom wall interposed therebetween, and the through hole is the It is provided so that it may penetrate from the end surface of the surrounding wall of an accommodating part to the said bottom wall.
As a result, the through hole that faces the widened portion of the sandwiching slit opens at the end surface of the peripheral wall of the housing portion and does not open into the housing portion.

According to a fourth aspect of the present invention, in the sensor case according to the third aspect, the portion of the peripheral wall where the through hole is formed bulges with respect to the end surface of the general portion in the thickness direction of the peripheral wall. A bulging portion is provided.
Thereby, in the surrounding wall of an accommodating part, the thickness of the periphery of a through-hole comes to be ensured by the bulging part.

According to a fifth aspect of the present invention, in the sensor case according to the fourth aspect, the bulging portion is provided on each of an inner surface facing the housing portion of the peripheral wall and an outer surface on the outer side of the housing portion. It is characterized by.
Thereby, compared with the case where the bulging portion is provided only on the inner side surface of the peripheral wall, the amount of bulging inward of the peripheral wall is suppressed while sufficiently securing the thickness of the peripheral edge of the through hole. .

A sixth aspect of the present invention is the sensor case according to any one of the first to fifth aspects, wherein the narrow width portion is formed with a constant width in the extending direction of the clamping slit. It is characterized by that.
As a result, when the lead wire is pushed in from the narrow-width portion side of the clamping slit toward the wide-width portion during assembly, the lead wire is stably held by the narrow-width portion having a constant width in a deformed shape. It becomes like this.

A seventh aspect of the present invention is the sensor case according to any one of the first to fifth aspects, wherein the narrow portion is tapered so that the width increases toward the opening side of the clamping slit. It is characterized by being formed.
As a result, the lead wire is guided in the tapered shape of the narrow width portion and is smoothly pushed in the wide width portion direction.

  The invention of a rotating electrical machine according to an eighth aspect is characterized by using the sensor case according to any one of the first to seventh aspects.

  According to the invention of this application, since the lead wire is pulled out through the lead-out hole provided in the bottom wall of the housing portion of the sensor case main body, the capillary tube through which the lead wire is passed when the housing portion is filled with the filler. The phenomenon no longer occurs. Further, the holding wall clamping slit is provided with a narrow portion and a wide portion that is wider than the minimum width of the narrow portion and is positioned on the base side of the support wall. The step between the narrow portion and the narrow portion can prevent the lead wire from coming off. Therefore, according to the present invention, it is possible to facilitate the filling operation of the filler into the accommodating portion, and it is possible to prevent the lead wire from being displaced from the locking wall and improve the commercial value.

  According to the second aspect of the present invention, since the widened portion of the sandwiching slit can be formed by the forming pin that forms the through hole when the sensor case body is molded, the post-processing after the molding is reduced. Further improvement in production efficiency can be achieved.

  According to the third aspect of the present invention, the through hole that faces the widened portion of the sandwiching slit opens at the end surface of the peripheral wall of the housing portion and does not open inside the housing portion. In doing so, it is possible to prevent the filler from leaking out through the through hole.

  According to invention of Claim 4, since the thickness of the peripheral area of the through-hole in the surrounding wall of an accommodating part is ensured by the bulging part, the through-hole which penetrates a bottom wall from an end surface of a surrounding wall is formed reliably. be able to.

  According to the fifth aspect of the present invention, since the bulging portion is provided not only on the inner surface side but also on the outer surface side of the peripheral wall, the thickness of the peripheral wall of the through hole is sufficiently ensured. The amount of bulging in the inner direction can be suppressed, and interference between the bulging portion and the circuit board can be prevented.

  According to the sixth aspect of the present invention, since the lead wire can be stably held by the holding portion having a constant width, not only the lead wire pull-out direction but also the longitudinal direction of the lead wire and the width of the holding slit It is possible to reliably prevent backlash in the direction.

  According to the seventh aspect of the present invention, when the lead wire is assembled, the insertion of the lead wire can be guided by the tapered shape of the narrow width portion, so that the assembling workability can be improved.

It is a perspective view of the rotary electric machine of one Embodiment of this invention. It is sectional drawing corresponding to the AA cross section of FIG. 1 of the rotary electric machine of one Embodiment of this invention. It is the top view which showed the rotary electric machine of one Embodiment of this invention by making a rotor part into a cross section. It is an exploded top view of the stator and position detection sensor of one embodiment of this invention. It is a perspective view of the stator iron core of one Embodiment of this invention. It is a perspective view of the insulator of one embodiment of this invention. It is an expanded view of the inner peripheral side of the rotor of one Embodiment of this invention. It is a rear view of the position detection sensor of one Embodiment of this invention. It is the perspective view which looked at the position detection sensor of one Embodiment of this invention from the back side. It is a front view of the sensor case of the position detection sensor of one Embodiment of this invention. It is the perspective view which looked at the position detection sensor of one Embodiment of this invention from the front side. It is a disassembled perspective view of the position detection sensor of one Embodiment of this invention. It is a disassembled perspective view of the storage component of the position detection sensor of one Embodiment of this invention. It is a rear view of the storage component of the position detection sensor of one Embodiment of this invention. It is an expansion perspective view of the D section of Drawing 13 of the storage component of the position detection sensor of one embodiment of this invention. It is sectional drawing corresponding to the EE cross section of FIG. 15 of the storage component of the position detection sensor of one Embodiment of this invention. It is sectional drawing corresponding to the BB cross section of FIG. 8 of the sensor case of one Embodiment of this invention. It is an enlarged view of the C section of Drawing 8 of the sensor case of one embodiment of this invention. It is sectional drawing corresponding to the BB cross section of FIG. 8 of the sensor case of one Embodiment of this invention. It is sectional drawing corresponding to the BB cross section of FIG. 8 explaining the manufacturing process of the sensor case of one Embodiment of this invention. It is a timing chart which shows the detection state of each sensor element of the position detection sensor of one embodiment of this invention, and the output waveform of each phase of U, V, and W.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 3 show a rotating electrical machine 1 of this embodiment used as a starter generator for a vehicle engine. The rotating electrical machine 1 is a three-phase brushless rotating electrical machine, and includes a stator 2 fixed to an engine block (not shown), a rotor 4 fixed to an engine crankshaft (not shown), and the rotor 4. And a position detection sensor 6 for detecting the rotational position of the motor.

FIG. 4 shows the assembled state of the stator 2 and the position detection sensor 6, and FIGS. 5 and 6 show the components of the stator 2. As shown in these drawings, the stator 2 includes a stator iron core 2A formed by laminating electromagnetic steel plates and a plurality of coils 10 wound around the stator iron core 2A. As shown in FIG. 5, the stator core 2 </ b> A has a main body 2 a formed in an annular shape and a plurality of teeth 2 b that protrude radially outward from the outer peripheral surface of the main body 2 a. In addition, claw pieces 3 projecting in a substantially T shape are provided on both ends in the circumferential direction at the tip of each tooth portion 2b. An insulator 110 is attached to the outer surface of the stator core 2A so as to cover the peripheral region of each tooth portion 2b, and the coil 10 is wound around the peripheral region of each tooth portion 2b via the insulator 110. It has become.
The insulator 110 includes two insulator members that are divided into two substantially in the axial direction. FIG. 6 shows the outer shape of one of the insulator members 110A. In the figure, reference numeral 120 denotes a coil connection terminal molded on the insulator member 110A.

As shown in FIG. 2, the rotor 4 includes a bottomed cylindrical yoke 12 made of a magnetic material, and a boss portion 14 that is coaxially fixed to the bottom wall 12 a of the yoke 12. The crankshaft of the engine is coupled so as to be integrally rotatable.
FIG. 7 shows the inner peripheral side of the rotor 4 in a developed state. As shown in the figure, a plurality of magnets 16 are attached to the inner peripheral surface of the rotor 4 at equal intervals along the circumferential direction. Each of these magnets 16 is formed in a rectangular shape that is long in the axial direction of the rotor 4, and except for one, the other surface (inner surface) facing the center of the rotor 4 is either an N pole or an S pole. Crab is magnetized. One magnet 16c has a short auxiliary magnetic pole portion 160 whose inner surface is magnetized to the S pole on one end side (one end side in the longitudinal direction) of the main magnetic pole portion 162 whose inner surface is magnetized to the N pole. Are joined.

  Here, in FIG. 7, the magnet 16 a having the entire inner side surface magnetized to the N pole, the magnet 16 a, the magnet 16 having the entire inner side surface magnetized to the S pole, the magnet 16 b, the main magnetic pole portion 160 and the sub magnetic pole Assuming that the magnet 16 provided with the portion 162 is called a magnet 16c, in the rotor 4, the magnet 16c is disposed between a specific pair of adjacent magnets 16a, 16a, and between the other adjacent magnets 16a, 16a. A magnet 16b is disposed on the surface. Therefore, on the inner peripheral side of the rotor 4, N poles and S poles appear alternately except at one end side in the axial direction (upper end side in FIG. 7), and at one end side in the axial direction, before and after the auxiliary magnetic pole portion 160 of the magnet 16 c ( N poles appear continuously for three magnets only (before and after in the circumferential direction). As will be described in detail later, the region on one end side in the axial direction of the magnet 16 is used as a target for detecting the ignition timing of the engine, and the remaining region in the axial direction of the magnet 16 is mainly used for the coil 10. Used as a target for detecting commutation timing.

  Further, the coil 10 wound around the tooth portion 2b of the stator core 2A is pulled out of the stator 2 and connected to a control device (not shown). The control device rotates the rotor 4 and the crankshaft by supplying current to the coil 10 at a predetermined timing when the engine is started. After the engine is started, the power generated by the rotation of the rotor 4 is charged in a battery (not shown). Or for direct use. In FIG. 1, 100b is a lead wire connected to the coil 10, and 102b is a protective tube for bundling a plurality of lead wires 100b and covering them. Reference numeral 102a in the figure denotes a protective tube that bundles lead wires 100a (see FIG. 8) drawn from a sensor case 60 described later and covers the periphery thereof.

  By the way, the shape of the claw piece 3 of each tooth part 2b is not a fixed shape, and as shown in FIG. 5, the claw piece 3 of some of the tooth parts 2b is directed from one end side in the axial direction toward the central side in the axial direction. A notch 7 is provided. Specifically, the notch 7 is formed so as to form a substantially rectangular fitting groove across two claw pieces 3 adjacent in the circumferential direction, and the notch that forms the fitting groove. Seven pairs are arranged in a total of four locations in the circumferential direction. Hereinafter, the five tooth portions 2b in which the notch portions 7 are formed in the claw piece 3 are referred to as specific tooth portions 2B in order to distinguish them from the other tooth portions 2b. Sensor holding legs 80a, 80b, 80c, and 80d (see FIG. 4) of the position detection sensor 6, which will be described later, are inserted and disposed in pairs of the notches 7 formed in the adjacent specific teeth 2B. It is like that.

The first, second, third and fourth Hall ICs (sensor elements) 50a, 50b, 50c and 50d shown in FIG. 7 are accommodated in the leg portions 80a, 80b, 80c and 80d of the position detection sensor 6, respectively. ing. These Hall ICs 50a, 50b, 50c, 50d are opposed to the inner peripheral surface of the rotor 4 and detect the switching of the magnetic flux of the magnet 16.
Here, of the Hall ICs 50a, 50b, 50c, 50d disposed in the leg portions 80a, 80b, 80c, 80d, the first Hall IC 50a and the second, third, and fourth Hall ICs 50b, 50c, 50d The installation height differs, and as shown in FIG. 7, the first Hall IC 50a is arranged at a position M1 facing one end side in the axial direction of the inner circumferential surface of the rotor 4, and the second, third and fourth Hall IC 50b. , 50c, 50d are disposed at a position M2 facing the central side in the axial direction of the inner peripheral surface of the rotor 4. As a result, the first Hall IC 50a detects the switching of the magnetic flux of the magnets 16a, 16b, and 16c at a height passing through the sub magnetic pole part 160 of the magnet 16c, and the second, third, and fourth Hall ICs 50b, 50c, and 50d are The switching of the magnetic flux of the magnets 16a, 16b, 16c is detected at the height passing through the main magnetic pole part 162 of the magnet 16c.

  The second, third, and fourth Hall ICs 50b, 50c, and 50d output the signal detected at the position M2 on the center side of the rotor 4 to the control device as the rotational position signal of the rotor 4, and the first Hall IC 50a 4 is output to the control device as an absolute position information signal on the circumference of the rotor 4. The control device receives the output signals of the second, third, and fourth Hall ICs 50b, 50c, and 50d, controls the commutation timing for the three-phase coil 10, and outputs the output signals of the first Hall IC 50a and the second and second Hall ICs 50b, 50c, and 50d. The engine ignition timing is controlled in response to the output signals of the third and fourth Hall ICs 50b, 50c and 50d.

FIG. 21 is a timing in which signals generated by the control device according to the outputs of the Hall ICs 50a, 50b, 50c, and 50d and voltage waveforms output to the coils 10 of the U, V, and W phases are described. It is a chart.
In the figure, S2, S3 and S4 indicate pulse signals generated corresponding to the outputs of the second, third and fourth Hall ICs 50b, 50c and 50d, and S1 indicates the output of the first Hall IC 50a. Sv, Sw, and Su represent the output voltage waveforms of the V-phase, W-phase, and U-phase, respectively. In the figure, T1 is the timing at which the output (S4) of the fourth Hall IC 50d switches from high to low while the output (S1) of the first Hall IC 50a remains in the high state, and T2 is the output of the first Hall IC 50a. The timing at which the output (S4) of the fourth Hall IC 50d switches from low to high while (S1) remains in the high state, T3 is the third timing after the timing T1 and the output (S1) of the first Hall IC 50a remains in the high state. This is the timing at which the output (S3) of the Hall IC 50c switches from low to high. In the control device, timings T1, T2, and T3 can be obtained from changes in the signals S1, S2, S3, and S4.
For example, as shown in the figure, the control device controls the commutation timing of the coils 10 of the V phase, the W phase, and the U phase according to the signals S2, S3, S4, and the signals S2, S3, S4, The timing T1 is obtained from the signal S1, and the ignition of the engine is controlled at the timing T1.

8 to 12 show the position detection sensor 6.
The position detection sensor 6 is electrically connected to the first, second, third, and fourth Hall ICs 50a, 50b, 50c, and 50d in the resin sensor case 60, and the Hall ICs 50a, 50b, 50c, and 50d. The circuit board 34 to be connected is accommodated, and the sensor case 60 is fastened to the stator 2 and the engine block.

  In the sensor case 60, the sensor case main body 20 that mainly accommodates the circuit board 34 is formed along the arc shape of the outer peripheral edge portion of the stator 2, and the substantially fan-shaped bottom wall 21 overlaps the outer peripheral edge portion of the stator 2. It is arranged. A peripheral wall 23 is formed at the outer edge of the bottom wall 21 to form a concave accommodating portion 22 together with the bottom wall 21. The peripheral wall 23 is an outer peripheral wall portion 23a that forms a fan-shaped outer arc side, an inner peripheral wall portion 23b that forms a fan-shaped inner arc side, and a side wall that forms both sides extending in the fan-shaped radial direction. It consists of parts 23c and 23d.

  Four leg portions 80a, 80b, 80c, and 80d protrude from the outer surface (the surface facing the stator 2) of the bottom wall 21 of the sensor case body 20 so as to be spaced apart in the arc direction. These leg portions 80a, 80b, 80c, 80d are inserted between the pair of cutout portions 7 of the specific tooth portion 2B of the stator 2 as described above, and the outer peripheral wall of the bottom wall 21. Projections are provided at equal intervals at positions deviated toward the portion 23a. A thick plate-like tongue piece 64 is extended from the outer peripheral wall 23a of the sensor case body 20, and the tongue piece 64 is fastened to the engine block by a bolt (not shown). A wiring guide 68 for assembling a plurality of lead wires 100a drawn from the bottom wall 21 of the sensor case main body 20 and drawing them to the side is integrally formed at the center of the inner peripheral wall portion 23b of the sensor case main body 20. Is formed. Further, in the vicinity of both ends in the arc direction of the inner peripheral wall portion 23b, a pair of arm portions 62a whose tip side curves toward the stator 2 direction (the same direction as the extending direction of the leg portions 80a, 80b, 80c, 80d). 62b are extended, and a connecting block 62c is integrally provided at the ends of the pair of arm portions. The connection block 62c is superposed on the side surface of the main body 2a of the stator iron core 2A and is coupled to the stator 2 by a bolt (not shown).

  Further, a support wall 24 for supporting each lead wire 100a drawn out from the inside of the bottom wall 21 of the sensor case body 20 is protruded from the inner peripheral end of the bottom wall 21 of the sensor case body 20. ing. The support wall 24 is disposed on an extension of the inner peripheral wall portion 23 b of the peripheral wall 23 with the bottom wall 21 of the housing portion 22 interposed therebetween. The support wall 24 is provided with a plurality of slits 25 that cut from the protruding end side toward the root portion side, and the lead wires 100a are individually locked in the slits 25. Each slit 25 will be described in detail later.

  As shown in FIG. 10, four IC housing holes 90 are provided on the inner surface of the bottom wall 21 of the sensor case main body 20 so as to be continuous with the inner sides of the leg portions 80 a, 80 b, 80 c, and 80 d. Furthermore, a plurality of lead-out holes 72 for drawing the lead wire 100a from the inside of the housing portion 22 to the outside of the bottom wall 21 are provided at a position biased toward the inner peripheral wall portion 23b side of the bottom wall 21. The sensor unit 32 including the first, second, third, and fourth Hall ICs 50a, 50b, 50c, and 50d and the circuit board 34 is accommodated in the accommodating portion 22 of the sensor case body 20 from the upper opening. . Further, locking clips 70 for fixing the sensor unit 32 are provided in the vicinity of both ends of the inner surface of the bottom wall 21 of the sensor case body 20 in the arc direction. Each of the locking clips 70 has a split pin-like structure with a tapered front end side, and locks the edge of the fitting hole by its own elasticity while being fitted into the mating fitting hole.

FIG. 13 is an exploded view of the sensor unit 32.
The sensor unit 32 includes first, second, third, and fourth Hall ICs 50a, 50b, 50c, and 50d, a holding block 42 that holds these Hall ICs 50a, 50b, 50c, and 50d, and an attachment to the holding block 42. And a substantially arc-shaped circuit board 34. Hereinafter, in the description of each part of the sensor unit 32, the side facing the opening side of the housing part 22 when it is installed in the housing part 22 of the sensor case body 20 is referred to as the upper side, and the opposite side is referred to as the lower side. And

FIG. 14 shows the lower surface of the holding block 42.
As shown in the figure, the holding block 42 includes a substantially arc-shaped base plate 44 to which the circuit board 34 is attached on the upper surface side, and four holder pieces 46a, 46b, 46c, and 46d that protrude downward from the base plate 44. The Hall ICs 50a, 50b, 50c, 50d corresponding to the tip portions (projecting ends) of the holder pieces 46a, 46b, 46c, 46d are held. The three holder pieces 46b, 46c, and 46d that hold the second, third, and fourth Hall ICs 50b, 50c, and 50d are all set to have the same protruding length from the base plate 44, but hold the first Hall IC 50a. The holder piece 46a is set shorter than the protruding length of the other holder pieces 46b, 46c, 46d. The difference in the protruding length is that when the sensor case 60 is attached to the stator 2, the positional relationship between the Hall ICs 50a, 50b, 50c, 50d and the magnets 16a, 16b, 16c on the rotor 4 side is as shown in FIG. It is intended to be. In addition, on the side surfaces of the holder pieces 46a, 46b, 46c, 46d, the three lead wires (reference numerals omitted) of the corresponding Hall ICs 50a, 50b, 50c, 50d are held, and the tip portions of the lead wires are attached to the respective side portions. Grooves 48a, 48b, and 48c are formed on the circuit board 34.

Locking clips 49 for fixing the circuit board 34 to the upper surface of the base plate 44 project from two positions spaced apart in the arc direction on the base plate 44.
15 and 16 show the locking clip 49 of the base plate 44. FIG.
Each locking clip 49 has a split pin-like structure with a tapered front end, and has a neck portion 49a protruding upward from the upper surface of the base plate 44 and a larger outer diameter on the lower end side than the neck portion 49a. The head 49b is provided with a tapered surface 27 in a tapered shape, and a slit 28 that bisects these along the axial direction is provided at a portion extending from the head 49b to the neck 49a. The locking clip 49 is press-fitted into the mating fitting hole from the distal end side of the head portion 49b, thereby elastically deforming the neck portion 49a so as to narrow the distal end side of the slit 28, and the head portion 49b sinks into the mating fitting hole. When this occurs, the neck portion 49a is elastically restored and the edge portion of the fitting hole is locked by the head portion 49b.
In addition, the locking clip 49 is provided with a cylindrical first cutout portion 29 having a diameter larger than the separation width of the general portion of the slit 28 at the lower end of the slit 28, and on the root portion side of the neck portion 49a. A substantially rectangular second thinned portion 30 is provided on the outer surface. In this locking clip 49, the first and second cutout portions 29 and 30 are provided, so that the neck portion 49a can be easily bent and whitening due to stress concentration can be prevented. In FIGS. 15 and 16, reference numeral 31 denotes a step-shaped recess formed on the base plate 44 in relation to die cutting when the first thinning portion 29 and the second thinning portion 30 are molded.

  A wiring pattern is printed on the surface of the circuit board 34, and the lead wires of the Hall ICs 50 a, 50 b, 50 c, and 50 d are formed at predetermined positions on the wiring pattern from the bottom wall 21 of the sensor case body 20 through the lead-out holes 72. A plurality of lead wires 100a drawn to the outside are electrically connected by soldering. The circuit board 34 has fitting holes 36 and 39 into which engaging clips 49 and 70 projecting from the base plate 44 of the holding block 42 and the bottom wall 21 of the sensor case body 20 are inserted. . The circuit board 34 is locked to the holding block 42 and the sensor case body 20 by fitting with the locking clips 49 and 70 and the fitting holes 36 and 39. The lead wire 100a drawn out of the sensor case main body 20 through the lead hole 72 is inserted into the lead hole 72 from the outside of the sensor case main body 20 in the assembling order and pulled out to the inside of the housing portion 22. The tip portion thus soldered is fixed to a predetermined position on the circuit board 34 by soldering. Further, the lead wire 100a is pressed and deformed when inserted into the lead-out hole 72, thereby closing the gap with the lead-out hole 72.

Further, when the holding block 42 and the circuit board 34 of the sensor unit 32 are fixed in the housing portion 22 of the sensor case body 20 as described above, the filler 150 (see FIG. 1) is placed inside the housing portion 22 in this state. Is filled. As a result, the filler 150 is filled in the IC accommodating holes 90 of the leg portions 80a, 80b, 80c, and 80d, and around the holding block 42 and the circuit board 34, and solidifies in the accommodating portion 22 by being left as it is for a predetermined time. To do.
At this time, since the plurality of lead wires 100a connected to the circuit board 34 are drawn out of the accommodating portion 22 through the lead holes 72 provided in the bottom wall 21, the filler 150 before solidification is exposed to the outside. It does not cause capillary action to be sucked out.

By the way, the lead wires 100a drawn out of the bottom wall 21 from the lead-out holes 72 are sandwiched by the corresponding slits 25 of the support wall 24 as described above. The slits 25 are shown in detail in FIG. The structure is as shown in FIG.
17 and 18 show a state before the lead wire 100a corresponding to the slit 25 is sandwiched, and FIG. 19 shows a state where the lead wire 100a corresponding to the slit 25 is sandwiched.
The slit 25 is not formed with a constant width from the protruding end side to the root portion side, but a narrow width portion 51 narrower than the diameter of the lead wire 100a is provided on the protruding end side of the slit 25, A widened portion 52 wider than the narrowed portion 51 is provided on the root side. And between the narrow part 51 and the wide part 52, the level | step-difference part 53 bent at substantially right angle is provided. Moreover, as shown in FIG. 18, the part which faces the narrow part 51 of each slit 25 of the support wall 24 is made into the shape which the front end side converges in acute angle shape.
The lead wire 100a is press-fitted into the opening on the narrow width portion 51 side of each slit 25 from a substantially right angle direction, and is pushed into the wide width portion 52 as shown in FIG. As a result, the lead wire 100a is partially clamped by the narrow width portion 51, and the displacement in the removal direction (opening direction of the slit 25) is regulated by the step portion 53.

In addition, at the position facing the base portion (widened portion 51) of each slit 25 of the bottom wall 21 of the sensor case body 20, the end surface of the inner peripheral wall portion 23b (peripheral wall 23) of the housing portion 22 faces the outer surface side of the bottom wall. A through hole 54 penetrating therethrough is provided. The inner diameter (diameter) of the through hole 54 is the same size as the width of the widened portion 51.
FIG. 20 is a diagram illustrating a molding process of the sensor case 60.
As shown in the figure, when the sensor case 60 is formed by molding, a plurality of molding pins 55 are projected in the molding die, and the widened portion 51 and the stepped portion 53 of each slit 25 are formed by the molding pins 55. Is formed together with the through hole 54. That is, since the inner diameter of the through hole 54 is the same size as the width of the enlarged diameter portion 51, the molding pin 55 having the same diameter as the through hole 54 is projected to the position of the stepped portion 53 during molding. When the pin 55 is pulled out, the stepped portion 53 and the widened portion 52 are formed on the base portion side of the support wall 24 so as to be continuous with the narrow portion 51 of the slit 25.

Further, as shown in FIGS. 8 to 12, a bulging portion 56 a is formed at a portion where the through hole 54 of the inner peripheral wall portion 23 b of the sensor case body 20 is formed in order to increase the thickness of the peripheral edge of the through hole 54. , 56b are provided. These bulging portions 56a and 56b bulge in an arc shape with respect to the end surface of the general portion in the thickness direction on the inner surface facing the inside of the accommodating portion 22 of the inner peripheral wall portion 23b and the outer surface of the inner peripheral wall portion 23b. Is provided.
The through hole 54 is not necessarily provided at the center in the thickness direction of the general portion of the inner peripheral wall portion 23b. For example, the bulged portion 56b on the outer surface side bulges more than the bulged portion 56a on the inner surface side. If so, it is also possible to arrange the through hole 54 at a position offset to the outer surface side with respect to the center of the general portion in the thickness direction.

  As described above, in the sensor case 60 used in the rotating electrical machine 1 of this embodiment, the lead wire 100a is drawn out through the lead-out hole 72 provided in the bottom wall 21 of the housing portion 22 of the sensor case body 20. When filling the container 150 with the filler 150, there is no concern that the filler 150 is sucked out by capillary action, and the filling operation can be performed without tilting the sensor case body 20. For this reason, the filling operation | work of the filler 150 can be facilitated and production efficiency can be improved.

  Further, in the sensor case 60, the narrow portion 51 and the widened portion 52 are provided in the slit 25 of the support wall 24 for locking the lead wires 100a drawn from the lead holes 72, and the narrow portion 51 and the widened portion. 52 is provided with a stepped portion 53 that restricts displacement in the direction in which the lead wire 100a is pulled out (the direction along the slit 25). It is possible to prevent misalignment. Therefore, the merchantability of the rotating electrical machine 1 can thereby be improved.

Further, in the sensor case 60, not only can the displacement of the lead wire 100a be regulated by the step portion 53 of the slit 25, but also the narrow portion 51 having a width smaller than the outer diameter (diameter) of the lead wire 100a. Since the lead wire 100a can be held in an elastically deformed state, the longitudinal displacement of the lead wire 100a and the play in the width direction of the slit 25 can be reliably suppressed.
In particular, in this embodiment, since the width of the narrow portion 51 is constant, a part of the lead wire 100a inserted and arranged in the wide portion 52 can be stably held by the narrow portion 51. There is an advantage.

  In the case of the sensor case 60, since the through-hole 54 is provided in the bottom wall 21 of the sensor case body 20 so as to face the widened portion 52 of each slit 25 on the support wall 24, the sensor case 60 mold By forming a molding pin 55 for modeling the through hole 54 in the mold at the time of molding, the stepped portion 53 and the widened portion 52 can be easily modeled at the base portion side of each slit 25 at the tip portion of the molding pin 55. can do. Therefore, post-processing after mold forming can be reduced to increase production efficiency.

  Further, the sensor case 60 extends on the extension of the inner peripheral wall portion 23b of the accommodating portion 22 with the support wall 24 sandwiching the bottom wall 21 therebetween, and the through hole 54 extends from the end surface of the inner peripheral wall portion 23b to the bottom wall 21. Therefore, the through hole 54 does not open inside the accommodating portion 22 filled with the filler 150, and the filler 150 in the liquid state passes through the through hole 54 when the filler 150 is filled. It is possible to prevent leakage to the outside.

And in this sensor case 60, since the bulging parts 56a and 56b are provided in the site | part in which the through-hole 54 is provided on the inner peripheral wall part 23b, avoiding thinning of the surrounding wall of the through-hole 54, The through hole 54 can be reliably formed so as to penetrate the end surface of the inner peripheral wall portion 23b.
However, the bulging portions 56a and 56b can be formed only on either the inner side surface or the outer side surface of the inner peripheral wall portion 23b. However, as in this embodiment, both the inner side surface and the outer side surface are formed. When the bulging portions 56a and 56b are provided, the amount of bulging from one surface can be reduced, the appearance can be improved, and interference between the bulging portion 56a and the circuit board 34 can be avoided. It becomes easy.
Further, if the through hole 54 is provided to be offset to the outer surface side with respect to the thickness center of the general portion of the inner peripheral wall portion 23b, interference between the bulged portion 56a on the inner surface side and the circuit board 34 can be prevented more advantageously. can do.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above embodiment, the narrow width portion 51 on the protruding end side of the slit 25 is formed with a constant width, but it is formed in a tapered shape so that the width increases toward the opening side of the slit. May be. In this case, since the width of the narrow width portion on the opening side gradually increases, the lead wire can be easily attached to the slit.

DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine 20 ... Sensor case main body 21 ... Bottom wall 22 ... Housing part 23 ... Peripheral wall 24 ... Support wall 25 ... Slit 34 ... Circuit board 50a ... 1st Hall IC (sensor element)
50b ... Second Hall IC (sensor element)
50c ... Third Hall IC (sensor element)
50d ... 4th Hall IC (sensor element)
DESCRIPTION OF SYMBOLS 51 ... Narrow part 52 ... Wide part 53 ... Step part 54 ... Through-hole 56a, 56b ... Expansion part 60 ... Sensor case 72 ... Lead-out hole 100a ... Lead wire

Claims (8)

A concave housing is provided in the sensor case body,
A circuit board that is electrically connected to the sensor element is accommodated in the accommodating portion,
In the sensor case in which the lead wire connected to the circuit board is pulled out from the housing portion,
A pull-out hole for pulling out the lead wire to the outside is provided in the bottom wall of the housing portion, and a support wall for locking the lead wire is projected from the outer surface of the bottom wall,
This support wall is provided with a clamping slit cut from the protruding end side toward the root portion side,
The sandwiching slit has a narrow width portion located near the protruding end of the support wall and a wide width portion wider than the minimum width of the narrow width portion and located near the root portion of the support wall. Provided,
A sensor case, wherein a stepped portion is provided between the narrow portion and the wide portion to restrict the lead wire from coming off.   The sensor case according to claim 1, wherein a through hole facing the widened portion is provided in a bottom wall of the housing portion.   The support wall extends on an extension of the peripheral wall of the housing portion with the bottom wall interposed therebetween, and the through hole is provided so as to penetrate from the end surface of the peripheral wall of the housing portion to the bottom wall. The sensor case according to claim 2.   The bulge part which bulges with respect to the general part end surface of the thickness direction of the said peripheral wall is provided in the site | part in which the said through-hole is formed among the said peripheral walls. Sensor case.   5. The sensor case according to claim 4, wherein the bulging portion is provided on each of an inner surface facing the inside of the housing portion of the peripheral wall and an outer surface on the outer side of the housing portion.   The sensor case according to claim 1, wherein the narrow portion is formed with a constant width in the extending direction of the sandwiching slit.   The sensor case according to any one of claims 1 to 5, wherein the narrow portion is formed in a tapered shape so that the width increases toward the opening side of the sandwiching slit.   A rotating electrical machine using the sensor case according to any one of claims 1 to 7.

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