JP5563805B2 - Sensor case and rotating electric machine using the same - Google Patents

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 fixed to the fixed portion 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 tongue piece portion having a bolt insertion hole extends on the outer wall of the sensor case body, and the tongue piece portion is fixed to a fixing member such as an engine block by a bolt penetrating the bolt insertion hole.

JP 2009-89588 A

However, in this conventional sensor case, the peripheral area of the bolt insertion hole of the tongue piece is formed flat, and the seat surface of the bolt abuts against this flat surface, so that the tongue piece is deteriorated such as cracking. Without this, it is difficult to manage the fastening torque for firmly fixing the sensor case main body to the fixing member.
As a countermeasure for this, it is also considered that a collar that can penetrate the bolt insertion hole and come into contact with the fixing member is integrally provided on the bolt, and the collapse of the tongue piece portion due to tightening of the bolt is managed by the collar. . However, in this case as well, the seating surface of the bolt abuts against the flat surface of the periphery of the bolt insertion hole of the tongue piece, so that the crushing on the tongue piece side is not stable, and the fastening torque can be managed accurately. difficult.

  Therefore, the invention of this application is a sensor case capable of easily bolting a tongue piece extending from a sensor case main body to a fixing member under accurate tightening torque control, and a sensor case having a simple structure. The present invention intends to provide a rotating electric machine to be used.

According to a first aspect of the present invention for solving the above problem, a sensor element for detecting a rotational position of a rotor of a rotating electrical machine is housed in a resin-made sensor case body, and a tongue piece is formed on an outer wall of the sensor case body. In the sensor case in which the portion is extended and the tongue piece is fastened and fixed to the fixing member by the bolt, the bolt is disposed coaxially with the head tightened by the tool and the tongue. A collar that is inserted into the bolt insertion hole of one piece and abuts against the mounting surface of the fixing member, and is arranged radially outward from the head, and abuts against the peripheral edge of the bolt insertion hole of the tongue piece possess a flange portion, said at the peripheral portion of the bolt insertion hole of the tongue portion protruding is provided intermittently, the thickness of the tongue portion is thicker set than the length of the said collar, said The height of the protrusion is Characterized in that the thickness of Kishitahen portion is set to a height substantially the same height obtained by subtracting the length of the said collar.
Thereby, when the bolt which penetrated the bolt insertion hole of the tongue piece portion is tightened into the fixing member, the flange portion of the bolt comes into contact with the protrusion provided intermittently on the tongue piece, and the protrusion portion is crushed by the fastening torque. It will be.

According to a second aspect of the present invention, in the sensor case according to the first aspect, the fixing member is an engine block, and the bolt passes through a bolt insertion hole of the tongue piece portion and the engine block. And a height of the protrusion is set to a height obtained by subtracting the length of the collar from the thickness of the tongue piece.
Thus, the bolt passing through the bolt insertion hole of the tongue piece portion is screwed into the engine block, so that the projection until collar abuts against the engine block is crushed by the flange of the bolt.

According to a third aspect of the present invention, in the sensor case according to the first or second aspect, the number of the protrusions is three or more so that all the protrusions do not concentrate in a 180 ° range of the peripheral area of the bolt insertion hole. It is characterized by being arranged in a distributed manner.
As a result, the fastening load of the bolt acts substantially equally on the peripheral area of the bolt insertion hole.

  The invention of the rotating electrical machine according to claim 4 is characterized in that the sensor case according to any one of claims 1 to 3 is used.

  According to the invention of this application, since the protruding portion provided intermittently on the tongue piece portion is stably crushed when the bolt is fastened, the tongue piece portion can be accurately managed with a simple structure. The bolt can be easily fixed to the fixing member below.

According to the invention described in claim 2, since the axial force acting on the tongue piece from the bolt is limited by the collar contacting the engine block , the fastening torque acting on the tongue piece can be managed more accurately. be able to.

  According to the third aspect of the invention, since the three or more protrusions are dispersedly arranged so that all the protrusions do not concentrate in the 180 ° range of the peripheral area of the bolt insertion hole, the fastening load of the bolt insertion hole It acts almost evenly in the surrounding area and all the projections are crushed equally. Therefore, it is possible to more accurately manage the fastening torque that acts on the tongue piece.

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 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 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 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 5 (see FIGS. 12 and 13) and a rotor 4 fixed to an engine crankshaft (not shown). And a position detection sensor 6 for detecting the rotational position of the rotor 4.

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 includes a main body 2 a formed in an annular shape, and a plurality of teeth 2 b that project 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 secondary 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 is magnetized with N poles in the entire inner surface, the magnet 16 b is magnetized with S poles in the entire inner surface, and the main magnetic pole portion 160 and the sub-magnetic poles. 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 controlling the energization of 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. 8 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. 14 is a timing in which a signal generated by the control device according to the output of each Hall IC 50a, 50b, 50c, 50d and a voltage waveform output to the coil 10 of each phase of U, V, W 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 11 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 5.

  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 project 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 from each other 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 extends from the outer peripheral wall 23 a of the sensor case body 20, and the tongue piece 64 is fastened and fixed to the engine block 5. In addition, a wiring guide 68 is integrally formed at the center of the inner peripheral wall portion 23b of the sensor case main body 20 so as to collect a plurality of lead wires 100a drawn from the bottom wall 21 of the sensor case main body 20 and pull them out sideways. Has been. 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.

In addition, a plurality of lead-out holes 72 for drawing the lead wire 100 a from the inside of the housing portion 22 to the outside of the bottom wall 21 are provided at positions that are biased toward the inner peripheral wall portion 23 b 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. . In addition, a pair of locking clips 70 for fixing the sensor unit 32 protrude from the inner surface of the bottom wall 21 of the sensor case body 20. 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.

  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.

  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 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, when the lead wire 100 a is inserted into the lead-out hole 72, the outer surface is pressed and deformed, 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, the inside of the housing portion 22 is filled with the filler 150 (see FIG. 1) in that state. . Thereby, the filler 150 is filled around the Hall ICs 50a, 50b, 50c, and 50d in the legs 80a, 80b, 80c, and 80d and around the holding block 42 and the circuit board 34, and is left as it is for a predetermined time. It solidifies in the accommodating part 22.
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.

FIGS. 12 and 13 are views showing a process of fastening and fixing the tongue piece portion 64 extending on the outer peripheral wall portion 23 a of the sensor case body 20 to the engine block 5.
Here, the fastening structure between the tongue piece 64 and the engine block 5 will be described. In the following, the surface of the tongue piece 64 on the side from which the legs 80a, 80b, 80c, 80d on the bottom wall 21 protrude. Is called the back surface, and the opposite surface is called the front surface.
As shown in FIGS. 12 and 13, the tongue piece portion 64 is superposed on the mounting surface of the engine block 5 and fastened and fixed by bolts 170 in this state. The tongue piece portion 64 is provided with a bolt insertion hole 171 into which the bolt 170 is inserted, and the front end portion of the bolt 170 is inserted into the bolt insertion hole 171 from the back surface side of the tongue piece portion 64. Further, the bolt 170 is integrally provided with a flange portion 170b that contacts the back surface of the tongue piece portion 64 and a collar 170c that is inserted into the bolt insertion hole 171 with a minute gap on the head portion 170a. A shaft portion 170d screwed into the screw hole 172 protrudes outward from the collar 170c. Note that the end surface of the collar 170 c is flat and can come into contact with the mounting surface of the engine block 5.

Further, as shown in FIGS. 8 and 9, three arc-shaped depressions 183 are provided on the outer peripheral edge of the bolt insertion hole 171 on the back surface of the tongue piece 64, and the depressions adjacent in the circumferential direction are provided. A protrusion 184 that protrudes relative to the bottom surface of the recess 183 is provided between 183. In the case of this embodiment, three protrusions 184 are intermittently arranged in the peripheral area of the bolt insertion hole 171. When the bolt 170 is tightened into the engine block 5, the flange portion 170 b of the bolt 170 comes into contact with these protrusions 184. In addition, as shown in FIG. 8, each protrusion 184 is formed over a range wider than the diameter of the flange portion 170b.
The three protrusions 184 are portions that are crushed by the flange portion 170b when the bolt 170 is tightened into the engine block 5, and the height H of these protrusions 184 (the depth of the recess portion 183) is The height is set by subtracting the length L of the collar 170 c from the thickness T of the piece 64.

  In the above configuration, when the sensor case 60 is actually fixed to the engine block 5, the surface of the tongue piece 64 is superposed on the mounting surface of the engine block 5, and the shaft of the bolt 170 passing through the bolt insertion hole 171. The portion 170d is screwed into the screw hole 172 of the engine block 5. At this time, the collar 170c of the bolt 170 is inserted into the bolt insertion hole 171 with a minute gap, and as a result, the tongue piece 64, the bolt 170, and the engine block 5 are positioned almost accurately.

  When the head portion 170a of the bolt 170 is further tightened by the tool, the flange portion 170b of the bolt 170 gradually crushes the three protrusions 184 on the tongue piece portion 64, and the bolt 170 with respect to the tongue piece portion 64 accordingly. Fastening torque increases. Thus, when the three protrusions 184 are almost completely crushed, the tip of the collar 170c comes into contact with the mounting surface of the engine block 5. Tightening with respect to the bolt 170 ends at that time.

  As described above, the sensor case 60 is intermittently provided with the plurality of protrusions 184 with which the flange 170b of the bolt 170 abuts on the peripheral edge of the bolt insertion hole 171 on the tongue piece 64. The protrusion 184 can be easily and stably crushed with the fastening torque of 170, and the tongue piece 64 can be fastened and fixed to the engine block 5 with a substantially constant torque. Therefore, the sensor case 60 can be easily bolted to the engine block 5 under accurate tightening torque control with a simple structure.

  In the case of the sensor case 60, the collar 170c is provided on the bolt 170, and the height H of the protrusion 184 is set to a height obtained by subtracting the length L of the collar 170c from the thickness T of the tongue piece 64. When the bolt 170 is fastened, the axial force of the bolt 170 acting on the tongue piece 64 can be surely restricted by the collar 170c coming into contact with the engine block 5. Therefore, with this structure, the fastening torque acting on the tongue piece 64 can be managed more accurately.

Furthermore, in this sensor case 60, there are three protrusions 184 that are intermittently arranged in the peripheral area of the bolt insertion hole 171 of the tongue piece 64, and these do not all gather in the 180 ° range on the circumference. Therefore, all the protrusions 184 can be stably crushed by the fastening torque of the bolt 170. Therefore, with this configuration, the fastening torque acting on the tongue piece 64 can be managed more accurately.
However, the number of projections 184 formed in the peripheral area of the bolt insertion hole 171 is not limited to three, but may be four or more. However, when the number of projections 184 is three, the desired number of projections is minimized. An effect can be obtained.

  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, a plurality of arc-shaped depressions 183 are provided in the peripheral area of the bolt insertion hole 171, and the protrusions 184 that are relatively raised are provided between the adjacent depressions 183. You may make it provide a some protrusion so that it may protrude from the general surface of the circumference area of a bolt insertion hole.

DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine 2 ... Rotor 20 ... Sensor case main body 50a, 50b, 50c, 50d ... Hall IC (sensor element)
60 ... Sensor case 170 ... Bolt 170c ... Collar 171 ... Bolt insertion hole 184 ... Projection

Claims (4)

The sensor case body made of resin accommodates a sensor element for detecting the rotational position of the rotor of the rotating electrical machine, and a tongue piece is extended on the outer wall of the sensor case body, and the tongue piece is fixed by a bolt. In the sensor case fastened and fixed to
The bolt is
A head tightened by a tool;
A collar that is arranged coaxially with the head and that is inserted into the bolt insertion hole of the tongue piece and abuts against the mounting surface of the fixing member;
While being located radially outwardly of the head, have a, abutting flange portion to the peripheral portion of the bolt insertion hole of the tongue piece portion,
Protrusions are provided intermittently in the peripheral portion of the bolt insertion hole of the tongue piece portion,
The thickness of the tongue piece is set to be thicker than the length of the collar,
The height of the protrusion is set to be substantially the same as the height obtained by subtracting the length of the collar from the thickness of the tongue piece . The fixing member is an engine block,
The bolt is provided with a collar that can penetrate the bolt insertion hole of the tongue piece and contact the engine block.
The sensor case according to claim 1, wherein the height of the protrusion is set to a height obtained by subtracting the length of the collar from the thickness of the tongue piece.   3. The sensor case according to claim 1, wherein the number of the protrusions is three or more, and the protrusions are dispersedly arranged so that all the protrusions do not concentrate in a range of 180 ° in a peripheral area of the bolt insertion hole. .   A rotating electrical machine using the sensor case according to claim 1.

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