WO2015098056A1 - Dynamo-electric machine for internal combustion engine - Google Patents

Abstract

This dynamo-electric machine (10) for an internal combustion engine has a rotor (21) and a stator (31) and is provided with a sensor unit (41). Said sensor unit (41) has a rotational-position sensor (43) located between magnetic poles. Said rotational-position sensor (43) detects the rotational position of the rotor (21) by detecting the magnetic flux from permanent magnets (23) on the rotor (21). The rotational-position sensor (43) protrudes from the sensor unit (41) and is accommodated inside a cover (53) located between magnetic poles. The sensor unit (41) has a leg part (61) that can be pressed against a body (13) so as to deform in the axial direction. A retainer (71) that is made from a metal plate and presses on the sensor unit (41) in the direction of said body (13) is provided. Said retainer (71) makes it possible to hold the sensor unit (41) in place stably.

Description

Rotating electric machine for internal combustion engine Cross-reference of related applications

This application is based on Japanese Patent Application No. 2013-268748 filed on December 26, 2013 and Japanese Patent Application No. 2014-243432 filed on December 1, 2014. The contents are incorporated by reference into this application.

The invention disclosed herein relates to a rotating electrical machine for an internal combustion engine connected to the internal combustion engine.

Patent Documents 1-3 disclose a rotating electrical machine for an internal combustion engine connected to the internal combustion engine. This rotating electrical machine can function as a generator and / or a starter. In addition, the rotating electrical machine outputs a reference position signal for the ignition device of the internal combustion engine. This rotating electrical machine includes a rotational position sensor for detecting the rotational position of the rotor in order to function as a starter. Further, the rotating electrical machine includes a rotational position sensor for outputting a reference position signal for the ignition device.

In order to stably enable accurate detection of the rotational position of the rotor, the rotating electrical machine disclosed in Patent Document 1 has both a radially inner end and a radially outer end of the case supporting the rotational position sensor. It is fixed. Specifically, the radially inner end of the case is fixed to the stator core with bolts. A radially outer end portion of the case is fixed to a body of the internal combustion engine, for example, a crankcase by bolts.

The description content of the prior art documents listed as the prior art is introduced or incorporated by reference as an explanation of the technical elements described in this specification.

Patent No. 5064279 JP 2013-233030 A JP 2013-27252 A

In a conventional rotating electric machine, a resin bracket portion extending radially outward from a case is fastened to a body of an internal combustion engine by bolts. In this configuration, there are some problems due to the bracket portion made of resin. One of them is that, in order to obtain a required strength, the resin bracket portion is enlarged, and the area occupied on the internal combustion engine is increased. Further, the resin bracket portion is easily deformed by a tightening torque by a metal bolt. For this reason, a mechanism for limiting the thickness that can withstand the tightening torque or the tightening torque that acts on the resin bracket portion is required. For example, it is necessary to take measures such as providing a metal bush on the resin bracket portion or using a special bolt with a limited tightening amount. In addition, the dimensions of the resin bracket portion may fluctuate due to aging or humidity. Such a dimensional variation makes it difficult to maintain the tightened state. In addition to the variation in dimensions, vibrations may cause problems such as breakage of the bracket portion and displacement of the rotational position sensor.

In the above-mentioned viewpoints or other viewpoints not mentioned, further improvement is required for the rotating electrical machine for the internal combustion engine having the rotational position detector.

One of the objects of the invention is to provide a rotating electrical machine for an internal combustion engine capable of stably fixing a sensor unit for a rotational position sensor.

Still another object of the invention is to provide a rotating electrical machine for an internal combustion engine that occupies a small area on the internal combustion engine.

The invention disclosed herein employs the following technical means to achieve the above object. Note that the reference numerals in parentheses described in the claims and in this section indicate the correspondence with the specific means described in the embodiments described later, and do not limit the technical scope of the invention. .

One of the disclosed inventions provides a rotating electrical machine for an internal combustion engine. The invention includes a rotor (21) in which a permanent magnet (23) for providing a field is arranged on an inner surface of a rotor yoke (22) connected to a rotation shaft of the internal combustion engine (12), and a body of the internal combustion engine (12). A stator (31) having a stator core (32) disposed on the inner side of the rotor by being fixed to (13) and forming a plurality of magnetic poles (32a) facing the permanent magnet on the radially outer side, and between the magnetic poles A rotation position sensor (43) that is disposed and detects the rotation position of the rotor by detecting the magnetic flux of the permanent magnet, and is formed by a sensor unit (41) fixed to the stator and a metal plate; A retainer (71, A71, B71, C71, E71) that presses the unit toward the body is provided.

According to this configuration, the sensor unit fixed to the stator is positioned between the stator and the body by attaching and fixing the stator to the body of the internal combustion engine. Furthermore, the sensor unit is pressed toward the body by a retainer formed of a metal plate. The retainer enables stable fixing of the sensor unit. Further, the retainer can be reduced in size as compared with the resin bracket.

It is sectional drawing of the rotary electric machine for internal combustion engines which concerns on 1st Embodiment of invention. It is the side view seen in the arrow II direction of FIG. It is the top view seen in the arrow III direction of FIG. It is a fragmentary sectional view of a sensor case. It is a top view of a leg part. It is a fragmentary sectional view which shows an assembly | attachment process. It is a fragmentary sectional view which shows an assembly | attachment process. It is the fragmentary sectional view which expanded a part of FIG. It is an expanded sectional view which shows a retainer. It is the top view seen in the arrow X direction of FIG. It is a top view of the leg which concerns on 2nd Embodiment of invention. It is a top view which shows the case which concerns on 3rd Embodiment of invention. It is a fragmentary sectional view showing the body concerning a 4th embodiment of the invention. It is a fragmentary sectional view showing the assembly process concerning a 5th embodiment of the invention. It is a fragmentary sectional view which shows an assembly | attachment process. It is a fragmentary sectional view showing the assembly process concerning a 6th embodiment of the invention. It is a fragmentary sectional view which shows an assembly | attachment process. It is a fragmentary sectional view showing the assembly process concerning a 7th embodiment of the invention. It is a fragmentary sectional view which shows an assembly | attachment process. It is a fragmentary sectional view showing the assembly process concerning an 8th embodiment of the invention. It is a fragmentary sectional view which shows an assembly | attachment process. It is a disassembled perspective view which shows the rotary electric machine which concerns on 9th Embodiment of invention. It is a fragmentary sectional view showing the retainer concerning a 10th embodiment of the invention. It is a fragmentary sectional view showing a retainer concerning an 11th embodiment of the invention. It is a top view which shows the retainer which concerns on 12th Embodiment of invention. It is a top view which shows the retainer which concerns on 13th Embodiment of invention. It is a fragmentary sectional view showing a retainer concerning a 14th embodiment of the invention. It is a perspective view which shows the case and retainer which concern on 15th Embodiment of invention. It is the elements on larger scale which show the decomposition | disassembly state of a case and a retainer. It is a perspective view which shows the case and retainer which concern on 16th Embodiment of invention. It is the elements on larger scale which show the decomposition | disassembly state of a case and a retainer. It is a perspective view which shows the case and retainer which concern on 17th Embodiment of invention.

A plurality of modes for carrying out the invention disclosed herein will be described with reference to the drawings. In each embodiment, portions corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals and redundant description may be omitted. Further, in the following embodiments, the correspondence corresponding to the matters corresponding to the matters described in the preceding embodiments is indicated by adding reference numerals that differ only by one hundred or more, and redundant description may be omitted. . In each embodiment, when only a part of the structure is described, the other parts of the structure can be applied with reference to the description of the other forms.

(First embodiment)
In FIG. 1, a rotating electrical machine for an internal combustion engine (hereinafter simply referred to as a rotating electrical machine) 10 is also called a generator motor 10 or an AC generator starter 10. The rotating electrical machine 10 is electrically connected to an electric circuit 11 including an inverter circuit (INV) and a control device (ECU). The electric circuit 11 provides a three-phase power conversion circuit.

The electrical circuit 11 provides a rectifier circuit that rectifies the AC power that is output when the rotating electrical machine 10 functions as a generator and supplies power to an electrical load including a battery. The electric circuit 11 provides a signal processing circuit that receives a reference position signal for ignition control supplied from the rotating electrical machine 10. The electric circuit 11 may provide an ignition controller that performs ignition control. The electric circuit 11 provides a drive circuit that causes the rotating electrical machine 10 to function as a starter motor. The electric circuit 11 receives from the rotating electrical machine 10 a rotational position signal for causing the rotating electrical machine 10 to function as an electric motor, and controls the energization of the rotating electrical machine 10 according to the detected rotational position to thereby start the rotating electrical machine 10. It functions as a motor.

The rotating electrical machine 10 is assembled to the internal combustion engine 12. The internal combustion engine 12 includes a body 13 and a rotary shaft 14 that is rotatably supported by the body 13 and rotates in conjunction with the internal combustion engine. The rotating electrical machine 10 is assembled to the body 13 and the rotating shaft 14. The body 13 is a structure such as a crankcase or a transmission case of the internal combustion engine 12. The rotating shaft 14 is a crankshaft of the internal combustion engine 12 or a rotating shaft interlocking with the crankshaft. The rotating shaft 14 rotates when the internal combustion engine 12 is operated, and drives the rotating electrical machine 10 to function as a generator. The rotating shaft 14 is a rotating shaft that can start the internal combustion engine 12 by the rotation of the rotating electrical machine 10 when the rotating electrical machine 10 functions as an electric motor.

The rotating electrical machine 10 includes a rotor 21, a stator 31, and a sensor unit 41.

The entire rotor 21 has a cup shape. The rotor 21 is positioned with its open end facing the body 13. The rotor 21 is fixed to the end of the rotating shaft 14. The rotor 21 rotates together with the rotating shaft 14. The rotor 21 provides a field by a permanent magnet.

The rotor 21 has a cup-shaped rotor yoke 22. The rotor yoke 22 is connected to the rotating shaft 14 of the internal combustion engine 12. The rotor yoke 22 has an inner cylinder fixed to the rotating shaft 14, an outer cylinder positioned on the radially outer side of the inner cylinder, and an annular bottom plate extending between the inner cylinder and the outer cylinder. The rotor yoke 22 provides a yoke for a permanent magnet described later. The rotor yoke 22 is made of magnetic metal.

The rotor 21 has a permanent magnet 23 disposed on the inner surface of the rotor yoke 22. The permanent magnet 23 is fixed inside the outer cylinder. The permanent magnet 23 has a plurality of segments. Each segment is partially cylindrical. The permanent magnet 23 provides a plurality of N poles and a plurality of S poles inside thereof. The permanent magnet 23 provides at least a field. The permanent magnet 23 also provides a partial special magnetic pole for providing a reference position signal for ignition control. The special magnetic pole is provided by a partial magnetic pole different from the magnetic pole arrangement for the field. The permanent magnet 23 is fixed with respect to the axial direction and the radial direction by a holding cup 24 arranged on the radially inner side. The holding cup 24 is made of a thin nonmagnetic metal. The holding cup 24 is fixed to the rotor yoke 22.

The rotor 21 is fixed to the rotating shaft 14. The rotor 21 and the rotating shaft 14 are connected via a positioning mechanism in the rotational direction such as key fitting. The rotor 21 is fixed by being fastened to the rotary shaft 14 by a fixing bolt 25.

The stator 31 is an annular member. The stator 31 is disposed between the rotor 21 and the body 13. The stator 31 has a through hole that can receive the rotating shaft 14 and the inner cylinder of the rotor yoke 22. The stator 31 has an outer peripheral surface that faces the inner surface of the rotor 21 via a gap. A plurality of magnetic poles are arranged on the outer peripheral surface. These magnetic poles are arranged opposite to the field of the rotor 21. The stator 31 has an armature winding. The stator 31 has multiphase armature windings. The stator 31 is fixed to the body 13. The stator 31 is a three-phase multipolar stator having a plurality of magnetic poles and three-phase windings.

The stator 31 has a stator core 32. The stator core 32 is disposed inside the rotor 21 by being fixed to the body 13 of the internal combustion engine 12. The stator core 32 forms a plurality of magnetic poles facing the permanent magnet 23 on the radially outer side. The stator core 32 is formed by laminating electromagnetic steel sheets formed in a predetermined shape so as to form a plurality of magnetic poles. The stator core 32 provides a plurality of magnetic poles facing the inner surface of the permanent magnet 23. A gap is provided between the plurality of magnetic poles of the stator core 32.

The stator 31 has a stator coil 33 wound around a stator core 32. The stator coil 33 provides an armature winding. An insulator made of an insulating material is disposed between the stator core 32 and the stator coil 33. The stator coil 33 is a three-phase winding.

The stator 31 is fixed to the body 13. The stator 31 and the body 13 are connected via a rotational positioning mechanism, for example, a fixing bolt 34. The stator 31 is fixed by being fastened to the body 13 by a plurality of fixing bolts 34.

The sensor unit 41 is fixed to the stator 31. The sensor unit 41 is a rotational position detector that detects the rotational position of the rotor 21 by detecting the magnetic flux supplied by the permanent magnet 23 provided in the rotor 21. The sensor unit 41 includes a rotational position sensor 43 that is disposed between the magnetic poles and detects the rotational position of the rotor 21 by detecting the magnetic flux of the permanent magnet 23.

The reference position for ignition control is indicated by the position of the special magnetic pole provided by the permanent magnet 23. The rotational position of the rotor 21 is also the rotational position of the rotating shaft 14. Therefore, a reference position signal for ignition control can be obtained by detecting the rotational position of the rotor 21.

The rotational position of the rotor 21 is indicated by the position of the field provided by the permanent magnet 23 in the rotational direction. Therefore, the rotating electrical machine 10 can function as an electric motor by detecting the rotational position of the rotor 21 and controlling the energization to the armature winding according to the detected rotational position.

The sensor unit 41 accommodates the circuit component 42. The circuit component 42 includes a substrate, an electric element mounted on the substrate, and an electric wire. The sensor unit 41 accommodates the rotational position sensor 43. The sensor unit 41 is fixed to the stator 31 with fixing bolts 44. The sensor unit 41 is fixed to the stator 31 at the radially inner portion. Further, the sensor unit 41 is positioned between the stator 31 and the body 13 at a radially outer portion. The sensor unit 41 is elastically pressurized between the stator 31 and the body 13 and fixed between them.

The sensor unit 41 has a case 51. The case 51 is made of a resin material. The case 51 can partially have a metal part. The case 51 accommodates and holds the circuit component 42 and the rotational position sensor 43. The rotational position sensor 43 is connected to the circuit component 42. The case 51 has a shape corresponding to a cross section of a polygonal cylinder, for example, a trapezoidal cylinder, and has an outer edge extending approximately corresponding to the radially outer edge of the stator 31.

The case 51 has a container 52 for accommodating the circuit component 42. The container 52 is made of a resin material. The container 52 has a box shape in which a surface facing the body 13 is opened. The circuit component 42 is accommodated in the container 52 and fixed.

The case 51 has at least one cover 53 for accommodating at least one rotational position sensor 43. The rotational position sensor 43 is fixed in the cover 53. The cover 53 is a bottomed cylindrical member formed so as to extend from the bottom surface of the container 52. The cover 53 is provided on the radially outer side. The cover 53 is inserted into the gap between the magnetic poles. The cover 53 is integrally formed to be continuous from the container 52 with the same resin material as the container 52.

The inside of the cover 53 communicates with the inside of the container 52. The sensor unit 41 has a plurality of covers 53. The cover 53 has a shape that can be called a finger shape or a tongue shape extending from the container 52. The cover 53 can also be called a sheath for the rotational position sensor 43. The plurality of covers 53 include one cover 53 for a rotational position sensor for detecting a reference position for ignition control and three covers 53 for rotational position sensors for motor control.

Each rotation position sensor 43 is accommodated in each cover 53. The rotational position sensor 43 detects the magnetic flux supplied from the permanent magnet 23. The rotational position sensor 43 is provided by a Hall sensor, an MRE sensor, or the like. This embodiment has one rotational position sensor for ignition control and three rotational position sensors for motor control. The rotational position sensor 43 is electrically connected to the circuit component 42 by electric wires arranged in a cavity in the cover 53.

The case 51 has a tightening portion 54. The tightening portion 54 is provided radially inward with respect to the radial direction of the rotating electrical machine 10 for the internal combustion engine. The tightening portion 54 is fastened to the stator 31 by the fixing bolt 44. A connecting portion 55 is provided between the container 52 and the tightening portion 54 to connect them. The tightening portion 54 and the connecting portion 55 extend radially inward from the container 52 and are positioned in an annular portion formed on the radially inner side of the stator core 32. The fastening portion 54 is integrally formed so as to be continuous from the container 52 by the same resin material as the container 52. The connecting portion 55 is integrally formed so as to be continuous from the container 52 with the same resin material as the container 52. The tightening portion 54 is positioned on the surface of the stator core 32 that faces the body 13. The tightening portion 54 is provided with a female screw portion that receives the fixing bolt 44. The female thread portion can be provided by forming a female thread directly in the resin material or by embedding a nut member in the resin material. The fixing bolt 44 fastens the fastening portion 54 to the stator core 32. The fixing bolt 44 is disposed through the stator core 32 from the surface of the stator core 32 opposite to the body 13. The front end portion of the fixing bolt 44 protruding from the stator core 32 is screwed into the female thread portion of the tightening portion 54. Thereby, the sensor unit 41 is fixed to the stator core 32.

The case 51 has a leg portion 61. The leg portion 61 can be deformed in the axial direction of the rotating electrical machine by being pressed against the body 13. The leg portion 61 is provided at the edge of the opening end of the container 52. The leg portion 61 is a member for positioning the position of the sensor unit 41 with respect to the body 13.

The leg portion 61 is provided so as to protrude from the container 52 toward the body 13. The leg portion 61 is positioned in a radially outer portion of the sensor unit 41. The leg part 61 is also called a boss part or a dowel part. The leg portion 61 is integrally molded so as to be continuous from the container 52 by the same resin material as the container 52. The leg portion 61 is provided only on a part of the surface of the container 52 facing the body 13. The tip of the leg 61 is in contact with the body 13 when the sensor unit 41 is assembled to the internal combustion engine 12. The sensor unit 41 contacts the body 13 only at the leg portion 61 on the radially outer side.

With respect to the radial direction of the rotating electrical machine 10, the leg portion 61 is disposed inside the outermost edge of the container 52. With respect to the radial direction, the leg portion 61 is positioned at a position substantially corresponding to the rotational position sensor 43 and the cover 53. The leg portion 61 is positioned slightly outward in the radial direction with respect to the rotational position sensor 43 and the cover 53. The leg portion 61 is disposed slightly outside the radial outer edge of the stator 31 in the radial direction. The leg portion 61 is disposed radially inward from the radially outer edge of the rotor 21. In this embodiment, the entire sensor unit 41 is disposed radially inward from the rotor 21.

With respect to the axial direction of the rotating electrical machine 10, the rotational position sensor 43, the cover 53, and the leg portion 61 are provided on the opposite side of the container 52. The rotational position sensor 43, the cover 53, and the leg portion 61 are formed so as to extend from both surfaces of the container 52 toward opposite to each other in the axial direction.

Furthermore, the rotating electrical machine 10 has a fastening mechanism for fixing the sensor unit 41 to the body 13. The fastening mechanism is provided between the case 51 and the body 13. The fastening mechanism is provided outside the sensor unit 41 in the radial direction. The fastening mechanism is provided by a retainer 71 and a fixing bolt 75. The fixing bolt 75 presses the retainer 71 against the body 13 by the head. The fixing bolt 75 is a normal metal bolt that does not have a boss portion that limits the tightening amount. The fixing bolt 75 is preferably a nonmagnetic metal. The fastening mechanism fastens the case 51 toward the body 13. The fastening mechanism fixes the case 51 to the body 13 in the radial direction and / or the circumferential direction.

The retainer 71 is formed of a thin metal plate. The retainer 71 can be provided by aluminum, copper, iron, or the like. In order to suppress the influence on the magnetic field provided by the rotor 21 and the stator 31, it is desirable that the retainer 71 and the fixing bolt 75 are provided by a nonmagnetic metal. The retainer 71 may be provided by a cold rolled steel plate. The retainer 71 has a hook shape. The retainer 71 is elastically deformable. The retainer 71 can also be called a clip or a holder.

The retainer 71 has a fixing portion 72 that is positioned on the body 13 and fixed by being tightened toward the body 13 by a fixing bolt 75. The retainer 71 has a hook portion 73 positioned on the surface of the case 51 facing the stator 31, that is, the bottom surface. In other words, the hook portion 73 is positioned on the surface of the case 51 opposite to the body 13. The retainer 71 has a vertical plate portion 74 that connects the fixing portion 72 and the hook portion 73 and extends in the axial direction.

The fixing portion 72 is positioned over the inside and outside of the radially outermost edge of the rotor 21. The fixing portion 72 is positioned at a position corresponding to the outermost edge of the rotor 21 with respect to the axial direction of the rotating electrical machine 10. The fixing bolt 75 is positioned at a position corresponding to the outermost edge of the rotor 21 in the axial direction. The hook portion 73 and the vertical plate portion 74 are positioned on the radially inner side from the outermost edge of the rotor 21. The tip of the hook portion 73 reaches the vicinity of the magnetic pole 32a. In the illustrated example, the tip end of the hook portion 73 reaches a position corresponding to the tip end surface of the magnetic pole 32a in the axial direction.

The retainer 71 hooks the radially outer portion of the sensor unit 41 and pulls it toward the body 13. The retainer 71 presses the case 51 toward the body 13 when the fixing bolt 75 is tightened. The retainer 71 presses the radially outer portion of the sensor unit 41 toward the body 13. The retainer 71 presses the sensor unit 41 toward the body 13 by elastic deformation. The retainer 71 fixes the sensor unit 41 to the body 13 in the radial direction and the circumferential direction by pressing the sensor unit 41 in the axial direction.

FIG. 2 shows the stator 31 and the sensor unit 41 as viewed from the outside in the radial direction. In the drawing, a plurality of magnetic poles 32a of the stator 31 and a plurality of gaps 32b between two magnetic poles 32a adjacent in the circumferential direction are shown. The gap 32b is a straight gap along the axial direction. A plurality of gaps 32 b are provided on the stator core 32. The gap 32b in which the cover 53 is inserted and the gap in which the cover 53 is not inserted have the same shape.

The cover 53 extending from the container 52 accommodates the rotational position sensor 43 therein. The position of the rotational position sensor 43 in the axial direction is set so that the magnetic flux to be detected can be detected. Details relating to the permanent magnet 23 for ignition control and motor control in this embodiment and details relating to the plurality of rotational position sensors 43 are disclosed in Japanese Patent No. 5064279, Japanese Patent Application Laid-Open No. 2013-233030, or Japanese Patent Application Laid-Open No. 2013-233030. The contents described in JP2013-27252A can be incorporated, and the description can be cited by reference.

The cover 53 has a base 53a having a large width in the circumferential direction and a tip 53b narrower than the base 53a. The width of the base 53a is larger than the width of the gap 32b. The width of the tip 53b is equal to or slightly smaller than the width of the gap 32b. The width of the tip portion 53b is such a width that the tip portion 53b can be disposed in the gap 32b and the tip portion 53b does not move excessively in the gap 32b in the circumferential direction. A step portion 53c is formed between the base portion 53a and the tip portion 53b.

The step portion 53 c is in contact with the axial end surface of the magnetic pole 32 a of the stator core 32. As a result, the cover 53 is inserted in the gap 32b in the axial direction by a predetermined amount. The step part 53 c provides a positioning part for positioning the cover 53 and the rotational position sensor 43 at a predetermined position with respect to the stator 31. The step portion 53 c regulates the insertion amount of the cover 53 by contacting the stator 31. The step portion 53c defines the insertion amount of the cover 53 using a step between the end face of the stator core 32 and the gap 32b. As a result, the cover 53, that is, the sensor unit 41 is positioned on the stator core 32 in the axial direction.

The leg 61 is set to be more easily deformed than the cover 53. In this embodiment, even if force concentrates on one cover 53, the shape, cross-sectional area, etc. are set so that the leg portion 61 is more easily deformed than the cover 53. The step portion 53 c receives a force in the axial direction of the rotating electrical machine 10 for the internal combustion engine by contacting the stator 31. Furthermore, the leg portion 61 receives a force in the axial direction of the rotating electrical machine by contacting the body 13. In such a state during the assembling work, in order to deform the leg portion 61, the leg portion 61 is set to be more easily deformed than the stepped portion 53c, that is, the cover 53. As a result, the positional deviation of the rotational position sensor 43 is suppressed, and fluctuations in detection accuracy are suppressed.

FIG. 3 is a plan view of the sensor unit 41 as viewed from the body 13. In the drawing, the central annular portion of the stator core 32 of the stator 31 is also shown. The stator core 32 is provided with a central through hole 32c and three through holes 32d for disposing the fixing bolts 34. Further, the stator core 32 is provided with a through hole (not shown) through which the fixing bolt 44 is disposed.

A sealing resin 56 for sealing the circuit component 42 is poured into the container 52. In the drawing, an electric wire 42a which is a part of the circuit component 42 is illustrated. The electric wire 42 a is an electric wire for transmitting a signal from the rotational position sensor 43. The electric wire 42a is connected to the electric circuit 11 via a wire harness (not shown).

Between the container 52 and the fastening part 54, the two connection parts 55 for connecting between them are provided. The connecting portion 55 extends along the radial direction of the rotating electrical machine 10. The connecting part 55 connects the radially inner fastening part 54 and the container 52. The connecting portion 55 has a relatively thick thickness in the axial direction in order to connect the fastening portion 54 and the container 52 with sufficiently high strength in the axial direction of the rotating electrical machine 10. As a result, when the fastening portion 54 is fastened to the stator core 32, the stepped portion 53 c of the cover 53 is strongly pressed against the magnetic pole 32 a of the stator core 32. As a result, the cover 53 and the rotational position sensor 43 accommodated therein are accurately positioned with respect to the stator core 32.

The container 52 extends in a substantially arcuate range along the radially outer portion of the stator 31. A plurality of rotational position sensors 43 and a plurality of covers 53 are arranged within a circumferential range in which the container 52 extends. The plurality of rotational position sensors 43 and the plurality of covers 53 are arranged at equal intervals.

The sensor unit 41 has a symmetry axis SYM. The container 52 extends symmetrically in the circumferential direction with respect to the symmetry axis SYM. The plurality of rotational position sensors 43 and the plurality of covers 53 are arranged symmetrically in the circumferential direction with respect to the symmetry axis. The two connecting portions 55 are arranged at target positions in the circumferential direction with respect to the symmetry axis SYM. In the tightening portion 54, the fixing bolt 44 is disposed on the symmetry axis SYM.

The leg portions 61 are arranged symmetrically with respect to the circumferential direction in order to support the container 52 spreading in the circumferential direction with a good balance. In this embodiment, only one leg 61 is arranged on the symmetry axis SYM. Thereby, the leg part 61 can support the sensor unit 41 with good balance.

The symmetry axis SYM is also the symmetry axis of the three through holes 32d. The symmetry axis SYM passes through one through hole 32d and is located at the center of the two through holes 32d. The leg 61 is pressed against the body 13 along the axial direction by fastening the fixing bolt 34 disposed in the through hole 32d. When the three fixing bolts 34 are tightened, only one fixing bolt 34 is strongly tightened, and even if the stator 31 is tilted, the leg portion 61 is prevented from being excessively pressed against the body 13. Arranging the leg 61 on the symmetry axis SYM, that is, arranging the leg 61 symmetrically with respect to the symmetry axis SYM, suppresses the leg 61 from being excessively pressed against the body 13.

The container 52 has a reinforcing portion 57 corresponding to the leg portion 61. The reinforcing portion 57 is provided on a part of the wall of the container 52. The thickness of the reinforcing portion 57 is greater than the thickness of the other wall of the container 52. The reinforcing portion 57 relieves stress concentration in the container 52.

FIG. 4 shows a partial cross section of the container 52. In the drawing, a cross section of a portion where the leg portion 61 is provided is shown. The reinforcing portion 57 has a slope whose thickness gradually increases from the open end of the container 52 toward the bottom. FIG. 5 is a plan view showing the tip of the leg portion 61.

The leg 61 has a relatively thick base 62. The base portion 62 is provided so as to protrude from the open end of the container 52. The base portion 62 has a cross-sectional area that does not cause plastic deformation even when the leg portion 61 is pressed against the body 13. The leg portion 61 has a tapered portion 63 that is thinner than the base portion 62. The tapered portion 63 is provided so as to further protrude from the tip of the base portion 62. The taper portion 63 provides a cross-sectional area decreasing portion in which the cross-sectional area gradually decreases from the base portion 62 toward the tip. The tapered portion 63 has a cross-sectional area that does not cause plastic deformation even when the leg portion 61 is pressed against the body 13. The tapered portion 63 may be elastically deformed when the leg portion 61 is pressed against the body 13. The taper part 63 can also be called an elastic deformation part. The base part 62 and the taper part 63 provide a non-plastic deformation part planned as a part that does not plastically deform even when the leg part 61 is pressed against the body 13 by attaching the stator 31 to the body 13. However, the base part 62 and the taper part 63 can be elastically deformed.

The leg 61 has the thinnest tip 64 at the tip. The tip portion 64 is provided so as to further protrude from the tip of the taper portion 63. The distal end portion 64 provides a plastic deformation portion that is planned to be partly plastically deformed when the leg portion 61 is pressed against the body 13 by attaching the stator 31 to the body 13. The tip 64 has a cross-sectional area that is plastically deformed by the assembly. A part of the tip 64 may be elastically deformed. The distal end portion 64 has a shape and a cross-sectional area that are more easily deformed than all the portions of the container 52 and the cover 53 that are positioned between the stepped portion 53 c and the distal end portion 64. The front end portion 64 has a shape and a cross-sectional area that are more easily elastically deformed than the stepped portion 53 c of the cover 53. The tip 64 is provided by a thin plate-like protrusion.

6 and 7 are partial cross-sectional views showing an assembly process in which the stator 31 is attached to the body 13. In the drawing, the state before and after the distal end portion 64 is plastically deformed is shown. The distance between the stepped portion 53 c and the distal end surface of the distal end portion 64 is set slightly larger than the distance between the end surface of the stator core 32 and the body 13. The distance between the stepped portion 53 c and the tip surface of the tapered portion 63 is set to be approximately equal to the distance between the end surface of the stator core 32 and the body 13. For this reason, when the stator 31 is assembled to the body 13, the stepped portion 53 c is pressed against the stator core 32. At the same time, the distal end portion 64 is pressed against the body 13. Since the tip end portion 64 is more easily plastically deformed than the cover 53, it is plastically deformed. As a result, the sensor unit 41 is positioned between the stator core 32 and the body 13 while being compressed and held while absorbing an error in the distance between the stator 31 and the body 13. At this time, a part of the taper part 63 of the leg part 61 and a part of the tip part 64 are elastically deformed. Furthermore, in this embodiment, the case 51 is tightened toward the body 13 by the retainer 71. Thereby, a part of the tip part 64 is plastically deformed, and a part of the tip part 64 is elastically deformed.

The sensor unit 41 is fixed by a tightening portion 54 on the radially inner side. The sensor unit 41 is held between the stator 31 and the body 13 when the stepped portion 43 c contacts the stator 31 and the leg portion 61 contacts the body 13 on the radially outer side. In addition, the sensor unit 41 is fixed to the body 13 by a retainer 71. The distance between the end face of the stator core 32 and the body 13 may fluctuate due to temperature change, aging, wear due to vibration, and the like. However, the sensor unit 41 is maintained in a pressurized state in the axial direction by a part of the plastic deformation of the tip 64 and a part of the elastic deformation of the leg 61, and the holding state is stably maintained. The

FIG. 8 is an enlarged view showing a portion of the fastening mechanism including the retainer 71. As illustrated, the hook portion 73 of the retainer 71 is disposed so as to contact the case 51. The hook portion 73 is disposed so as to contact the surface on the side opposite to the leg portion 61. The retainer 71 is disposed between two adjacent covers 53.

FIG. 9 is an enlarged sectional view of the retainer 71. In the drawing, an initial shape before being tightened by the fixing bolt 75 is shown. The retainer 71 elastically holds the case 51 toward the body 13 by its own elastic deformation. Accordingly, the case 51 is stably fixed to the body 13 even when vibration is applied. The retainer 71 has a hook portion 73 that is excessively bent so as to exhibit a predetermined elastic force. The hook portion 73 is in a state indicated by a broken line in the drawing when the case 51 is being pressed. On the other hand, in the initial state, that is, in the free state, the hook portion 73 has a shape that is bent larger than the use state, as shown by a solid line. The retainer 71 exerts a predetermined elastic force by elastically deforming from the initial state to the use state.

FIG. 10 is a plan view showing the case 51 and the retainer 71 viewed along the X direction in FIG. In the figure, the circumferential position of the retainer 71 relative to the case 51 is shown. In this embodiment, a single retainer 71 is provided. The retainer 71 is disposed so as to hook the corner portion of the case 51. The retainer 71 is positioned behind the leg portion 61. The hook portion 73 of the retainer 71 is positioned on the surface opposite to the surface on which the leg portion 61 is provided with respect to the case 51. The hook part 73 is positioned so as to overlap the leg part 61 in the axial direction. Such an arrangement enables a fastening force by the retainer 71 to act straightly toward the leg portion 61.

According to the embodiment described above, the sensor unit 41 is pressed toward the body 13 by the retainer 71 formed of a metal plate. According to this configuration, the sensor unit 41 fixed to the stator 31 is positioned between the stator 31 and the body 13 by the stator 31 being attached to the body 13 of the internal combustion engine 12 and being fixed. Further, the sensor unit 41 is pressed toward the body 13 by the retainer 71. The retainer 71 formed of a metal plate enables the sensor unit 41 to be stably fixed. Further, the retainer 71 can be reduced in size as compared with the resin bracket.

The leg 61 is deformed in the axial direction of the rotating electrical machine by being pressed against the body 13. Therefore, the sensor unit 41 contacts both the stator 31 and the body 13. The sensor unit 41 absorbs an error in the distance between the stator 31 and the body 13 by the deformation of the leg portion 61, and provides contact with both the stator 31 and the body 13.

The leg portion 61 has a portion 64 that can be plastically deformed by being pressed against the body 13. According to this configuration, even if there is an error in the distance between the stator 31 and the body 13, the leg portion 61 is plastically deformed to provide contact with both the stator 31 and the body 13.

The leg portion 61 has portions 63 and 64 that can be elastically deformed by being pressed against the body 13. The sensor unit 41 is fastened from both of the stator 31 and the body 13. In addition, since the sensor unit 41 includes a portion that can be elastically deformed, even if the distance between the stator 31 and the body 13 varies due to, for example, vibration, the stator 31 is caused by the elastic force of the sensor unit 41. Both the contact with the body 13 and the contact with the body 13 are maintained. The rotational position sensor 43 can be stably positioned even in a vibration environment.

The sensor unit 41 contacts the body 13 at the leg portion 61 and the retainer 71. According to this structure, the sensor unit 41 is fixed to the body 13 by the metal retainer 71 that can be elastically deformed. For this reason, the rotary electric machine 10 for internal combustion engines with which the assembly | attachment work to the internal combustion engine 12 is easy can be provided. For example, it is possible to provide the rotating electrical machine 10 for an internal combustion engine that does not require management of tightening torque for directly fixing the sensor unit 41 to the body 13. Further, the metal retainer 71 can be made smaller than the case where it is provided by resin. For this reason, the rotary electric machine 10 for internal combustion engines with the small range occupied on the internal combustion engine 12 can be provided.

(Second Embodiment)
This embodiment is a modification based on the preceding embodiment. In the said embodiment, the front-end | tip part 64 is provided by the plate-shaped protrusion. Instead, in this embodiment, the tip 264 is provided by a cross-shaped protrusion.

FIG. 11 is a plan view corresponding to FIG. The leg portion 261 has a distal end portion 264. The tip 264 is provided by a cross-shaped protrusion such as a Phillips screwdriver. The shape of the front end portion 264 makes it possible to adjust the ease of plastic deformation. In addition, the shape of the distal end portion 264 makes it possible to adjust the strength of the elastic force due to elastic deformation.

(Third embodiment)
This embodiment is a modification based on the preceding embodiment. In the above embodiment, only the leg portion 61 is provided. Instead, in this embodiment, a plurality of legs are provided.

FIG. 12 is a plan view corresponding to FIG. The container 52 has a plurality of leg portions 361a and 361b. Each of the plurality of leg portions 361 a and 361 b has the same shape as the leg portion 61. The plurality of leg portions 361a and 361b are provided at positions symmetrical in the circumferential direction with respect to the symmetry axis SYM. Their positions are symmetrical in the circumferential direction between the two through holes 32d. The container 52 has reinforcing portions 357a and 357b corresponding to the plurality of leg portions 361a and 361b, respectively.

From another viewpoint, the leg portions 361 a and 361 b are provided at positions corresponding to the cover 53 on the sensor unit 41. The cover 53 and the leg portions 361a and 361b are located on the opposite sides on the case 51. Therefore, the leg portions 361 a and 361 b are provided in the vicinity of the position corresponding to the cover 53 on the side opposite to the cover 53. Specifically, as shown, the cover 53 and the leg portions 361a and 361b are positioned on the radial line of the stator 31. When the stator 31 is tightened by the fixing bolt 34, the axial force is transmitted through the cover 53 toward the legs 361a and 361b at a short distance. As a result, the force for deforming the leg portions 361a and 361b is efficiently transmitted. The leg portions can be provided at various positions such as radially outward or radially inner than the cover 53, circumferentially outer than the group of the plurality of covers 53, or circumferentially inner.

According to this embodiment, the sensor unit 41 has the symmetry axis SYM, and the legs 361a and 361b are arranged symmetrically with respect to the symmetry axis SYM. According to this configuration, stable holding is possible. Further, the symmetry axis SYM is disposed between two adjacent fixing bolts 34 for fixing the stator 31 to the body 13. According to this configuration, excessive deformation of the leg portions 361a and 361b due to the inclination of the stator 31 during the assembly work is suppressed. The plurality of leg portions 361a and 361b make it possible to disperse contact portions between the sensor unit 41 and the body 13. Further, the elastic force provided by the legs 361a and 361b can be increased while maintaining the ease of plastic deformation of the legs 361a and 361b.

(Fourth embodiment)
This embodiment is a modification based on the preceding embodiment. In the above embodiment, the leg portion 61 contacts the planar body 13. Instead, in this embodiment, the body 13 is provided with a positioning portion for positioning the leg portion in the radial direction and / or the circumferential direction.

FIG. 13 is a partial cross-sectional view corresponding to FIG. The container 52 has a leg portion 61. The body 13 has a positioning portion 415 that is positioned with respect to both the radial direction and the circumferential direction with the leg portion 61 by being fitted to the leg portion 61. The positioning portion 415 is a round hole having an inner diameter slightly larger than that of the leg portion 61. By fitting the leg portion 61 to the positioning portion 415, the sensor unit 41 is positioned on the body 13 in both the radial direction and the circumferential direction. In this embodiment, the sensor unit 41 is positioned in the radial direction and / or the circumferential direction by fitting the case 51 and the body 13 together. Thereby, the movement to the radial direction and the circumferential direction of the sensor unit 41 under vibration is suppressed.

According to this embodiment, the leg portion 61 is positioned with respect to the body in the circumferential direction and / or the radial direction by fitting with the body 13. Therefore, the sensor unit 41 is positioned with respect to the body 13 in the circumferential direction and / or the radial direction of the rotating electrical machine. Thus, the rotational position sensor for ignition control is accurately positioned at a predetermined circumferential position with respect to the body 13. In addition, this configuration does not require any special positioning work, so that it can be easily assembled to the internal combustion engine.

(Fifth embodiment)
This embodiment is a modification based on the preceding embodiment. In the said embodiment, the leg part 61 which can be deform | transformed with the same material as the container 52 is provided. Instead, in this embodiment, a portion made of an elastic material that is easier to deform than the container 52 is provided in the leg portion.

14 and 15 are partial cross-sectional views corresponding to FIGS. 6 and 7. In the drawing, a cross section of the leg portion 561 is shown. The leg 561 includes a base 562 and an elastic protrusion 564 provided at the tip thereof. The base 562 and the elastic protrusion 564 are connected. The elastic protrusion 564 is made of a material that is more easily elastically deformed than the resin that forms the container 52. The elastic protrusion 564 is made of an elastic material such as rubber. When the stator 31 is assembled to the internal combustion engine 12, the leg portion 561 is pressed against the body 13. The elastic protrusion 564 itself is elastically deformed to fix the sensor unit 41 in a state where the sensor unit 41 is pressed between the stator core 32 and the body 13 while the sensor unit 41 is pressed against the stator core 32. According to this embodiment, the sensor unit 41 can be reliably held elastically.

(Sixth embodiment)
This embodiment is a modification based on the preceding embodiment. 16 and 17 are partial cross-sectional views corresponding to FIGS. 6 and 7. In the drawing, a cross section of the leg 661 is shown. The case 51 has a leg portion 661. The leg portion 661 is formed in a triangular pyramid shape. The leg portion 661 is formed such that the base of the triangular pyramid is in contact with the container 52 and the top of the triangular pyramid is directed to the body 13. The leg 661 has a base 662 and a tip 664 provided at the tip. The base 662 and the tip 664 also provide a taper 63 in the preceding embodiment. There is no clear boundary between the base 662 and the tip 664.

The tip 664 provides at least an elastically deformable portion. Furthermore, the tip 664 also provides a site that can be plastically deformed by its top portion. When the stator 31 is assembled to the internal combustion engine 12, the leg portion 661 is a sensor between the stator core 32 and the body 13 in a state where the sensor unit 41 is pressed against the stator core 32 by elastically deforming a part of itself. The unit 41 is fixed.

(Seventh embodiment)
This embodiment is a modification based on the preceding embodiment. 18 and 19 are partial cross-sectional views corresponding to FIGS. 6 and 7. In the drawing, a cross section of the leg portion 761 is shown. The case 51 has a leg portion 761. The leg portion 761 includes a columnar base portion 762 and a hemispherical tip portion 764 that is a tapered shape. The base 762 is in contact with the container 52. The base 762 has a cylindrical shape. The tip portion 764 is formed so that the top of the hemisphere is directed to the body 13. There is no clear boundary between the base 762 and the tip 764.

The tip portion 764 provides at least an elastically deformable portion. Further, the distal end portion 764 also provides a portion that can be plastically deformed by the distal end portion. Also in this embodiment, the leg portion 761 presses the sensor unit 41 against the stator core 32 by elastically deforming a part of itself.

(Eighth embodiment)
This embodiment is a modification based on the preceding embodiment. 20 and 21 are partial cross-sectional views corresponding to FIGS. 6 and 7. In the drawing, a cross section of the leg portion 861 is shown. The case 51 has a leg portion 861. The leg portion 861 includes a columnar base portion 862 and a conical tip portion 864 that is a tapered shape. The base 862 is in contact with the container 52. The base 862 has a cylindrical shape. The tip 864 is formed so that the top of the cone is directed to the body 13. The diameter of the proximal end of the distal end portion 864 is smaller than the diameter of the distal end of the base portion 862. Therefore, a clear boundary is provided between the base 862 and the tip 864.

The tip 864 provides at least an elastically deformable portion. Furthermore, the tip 864 also provides a plastically deformable portion. Also in this embodiment, the leg portion 861 presses the sensor unit 41 against the stator core 32 by elastically deforming a part of itself.

(Ninth embodiment)
This embodiment is a modification based on the preceding embodiment. In the embodiment illustrated in FIG. 13, the fitting between the case 51 and the body 13 is provided by the fitting between the leg portion 61 and the positioning portion 415. The fitting for positioning the sensor unit 41 with respect to the radial direction and / or the circumferential direction can be provided by using various shapes of various portions. In this embodiment, the fitting for positioning is provided by the circumferential end surfaces 959a and 959b of the case 51 and the positioning portion 915 provided on the boss portion 13a of the body 13.

FIG. 22 is an exploded perspective view showing the body 13, the stator core 32, and the sensor unit 41 in this embodiment. In the figure, a state in which the boss 13a of the body 13 and the stator core 32 are separated in the axial direction is illustrated. The boss portion 13 a protrudes from the main portion of the body 13 in the axial direction. In the figure, the boss portion 13a is shown in a virtual state cut at the base portion, and the cross section is shown by hatching. In the figure, a leg 661 is shown.

The body 13 has a cylindrical boss portion 13a. The boss portion 13 a is disposed so as to surround the rotation shaft 14. The boss portion 13a is cylindrical. The boss portion 13a is also a fixed base to which the stator core 32 is fixed. Around the boss portion 13a, a plurality of bolt hole forming portions 13b in which bolt holes for receiving the fixing bolts 34 are formed are provided. The boss portion 13a has three bolt hole forming portions 13b.

Correspondingly between two adjacent bolt hole forming portions 13b, a positioning portion 915 is provided on the boss portion 13a. The positioning portion 915 is provided by a portion that can be called a groove or a notch portion extending in the axial direction from the distal end surface of the boss portion 13a. In the positioning portion 915, the tightening portion 54 and the connecting portion 55 are positioned. In the assembly process, the tightening portion 54 and the connecting portion 55 are inserted into the positioning portion 915 along the axial direction. The positioning unit 915 enables the sensor unit 41 to be disposed in a radially inner region of the stator core 32. The size of the opening provided by the positioning unit 915 is preferably set so that the opening is covered by the sensor unit 41.

The positioning part 915 has two end faces 915a and 915b located at both ends in the circumferential direction. These end surfaces 915a and 915b define an opening that extends over a predetermined angular range in the boss portion 13a. The clearance in the circumferential direction between these end faces 915a and 915b corresponds to the width of the sensor unit 41 positioned there. The fastening portion 54 and the connecting portion 55 provide end faces 959a and 959b on both sides in the circumferential direction thereof. The gap defined by the end surfaces 915a and 915b corresponds to the width defined by the end surfaces 959a and 959b.

The gap can be set equal to the width. The gap can be set slightly larger than the width. By positioning the fastening portion 54 and the connecting portion 55 between the end faces 915a and 915b, the circumferential position of the sensor unit 41 with respect to the body 13 is positioned at a specified position. In other words, the circumferential position of the rotational position sensor for ignition control is positioned at a specified position.

There is a gap between the sensor and the boss, that is, an error between the gap and the width. Therefore, even after the sensor unit 41 is inserted into the positioning portion 915, the stator core 32 and the sensor unit 41 can rotate by a predetermined sensor-boss error angle. On the other hand, between the stator core 32 to which the sensor unit 41 is fixed and the body 13 (boss portion 13a), there is a core-body gap corresponding to the gap between the fixing bolt 34 and the bolt hole, that is, a circumferential error. is there. Therefore, although the fixing bolt 34 is inserted, the stator core 32 can be rotated by a predetermined core-body error angle inevitably generated between the stator core 32 and the body 13 before being tightened. The sensor-boss error angle is set smaller than the core-body error angle. The sensor-boss error angle is positioned within the range of the core-body error angle. Thereby, even in the configuration in which the sensor unit 41 is fixed to the stator core 32, the circumferential position of the sensor unit 41 is positioned at a specified position with high accuracy.

According to this embodiment, the rotational position sensor for ignition control is accurately positioned at a predetermined circumferential position with respect to the body 13 by fitting the case 51 and the body 13 together. Further, according to this configuration, since no special positioning work is required, the assembly work to the internal combustion engine is facilitated.

(10th Embodiment)
This embodiment is a modification based on the preceding embodiment. In the above embodiment, the retainer 71 includes a plate-like hook portion 73 that presses the case 51. Instead, in this embodiment, the retainer A71 can be preliminarily coupled to the sensor unit 41. The retainer A71 has a protrusion A76 that can be temporarily connected to the case 51 and can be attached and detached.

FIG. 23 is a partial cross-sectional view corresponding to FIG. In the figure, a retainer A71 according to this embodiment is shown. The retainer A71 has a protrusion A76 at the tip of the hook 73. The protrusion A76 allows the case 51 and the retainer A71 to be temporarily connected. The protrusion A76 positions the case 51 and the retainer A71 at a regular position, and connects the case 51 and the retainer A71 so as not to be separated only by gravity.

Corresponding to the protrusion A76, the case 51 has a receiving part A58 for connection. The receiving part A58 is a concave part having a shape corresponding to the protruding part A76. The receiving part A58 has a shape and a size that allow the protrusion A76 to be press-fitted. When the protrusion A76 is press-fitted into the receiving part A58, the case 51 and the retainer A71 are connected. The protrusion A76 may be press-fitted into the receiving part A58 while deforming the resin material forming the case 51. Further, the protruding portion A76 may form the receiving portion A58 by being inserted into the case 51 while deforming the case 51.

The projecting portion A76 and the receiving portion A58 provide a holding force that prevents the retainer A71 from being separated from the case 51 in the process of assembling the rotating electrical machine 10 to the internal combustion engine 12. As a result, loss of the retainer A71 in the assembling process is prevented. Therefore, the rotating electrical machine 10 that can be easily assembled is provided.

In another point of view, the protrusion A76 and the receiving part A58 prevent the retainer A71 from moving with respect to the case 51. For this reason, the position of the case 51 on the body 13 is reliably positioned at a predetermined position. Specifically, the case 51 is firmly fixed in the radial direction and the circumferential direction by the press-fitting portion A76 being firmly pressed into the receiving portion A58.

In this configuration, the protruding portion A76 and the receiving portion A58 provide a fitting portion for positioning the sensor unit 41 in the circumferential direction of the rotating electrical machine 10. The fitting portion is provided on the case 51 and the retainer A71. By fitting the protruding portion A76 and the receiving portion A58, the case 51 and the sensor unit 41 are positioned with respect to the body 13 with respect to the body 13 via the retainer A71. In addition, the retainer A71 can position the sensor unit 41 more accurately within the range of the core-body error angle. Therefore, the rotational position sensor for ignition control is accurately positioned at a predetermined circumferential position with respect to the body 13.

(Eleventh embodiment)
This embodiment is a modification based on the preceding embodiment. In the above embodiment, the retainer A71 is press-fitted into the case 51. Instead, in this embodiment, the retainer B 71 is connected to the case 51 by holding a part of the case 51.

FIG. 24 is a partial cross-sectional view corresponding to FIG. In the figure, a retainer B71 according to this embodiment is shown. The retainer B71 has a protrusion B77 extending from the vertical plate portion 74 toward the case 51. The protrusion B77 is a triangular protrusion. Case 51 has receiving part B58 for receiving projection B77. The receiving part B58 is a groove-shaped recess.

When the protruding portion B77 is received by the receiving portion B58, the hook portion 73 and the protruding portion B77 hold the corner portion of the case 51. Furthermore, the retainer B71 is coupled to the corner portion of the case 51 by a snap fit by elastic deformation of the retainer B71 itself. Further, the fitting between the protruding portion B77 and the receiving portion B58 fixes the case 51 in the radial direction and the circumferential direction.

Even in this configuration, the protrusion B77 and the receiving part B58 provide a fitting part for positioning the sensor unit 41 in the circumferential direction of the rotating electrical machine 10. The fitting portion is provided on the case 51 and the retainer B71.

(Twelfth embodiment)
This embodiment is a modification based on the preceding embodiment. In the above embodiment, as shown in FIG. 10, the retainer 71 is hooked only on the corner of the case 51. Instead, in this embodiment, the retainer C71 has a hook portion C73 that extends to the inside of the case 51 in the radial direction between the two covers 53.

FIG. 25 is a plan view corresponding to FIG. In the figure, a retainer C71 according to this embodiment is shown. The retainer C71 has a hook part C73. The hook part C73 is disposed between the two covers 53 arranged in the center. The hook portion C73 has a shape in which only the central portion extends radially inward so as to avoid interference with the two covers 53. Accordingly, the hook portion C73 is disposed so as to enter between the two covers 53 provided adjacent to each other. Thereby, the retainer C71 can hold | maintain the case 51 reliably. Further, the fitting between the cover 53 and the hook portion C73 facilitates the positioning of the retainer C71 in the assembly process.

According to this configuration, when the hook portion C73 is fitted between the two covers 53, the case 51 and the sensor unit 41 are positioned with respect to the body 13 with respect to the body 13 via the retainer C71. Moreover, the retainer C71 can position the sensor unit 41 more accurately within the range of the core-body error angle. Therefore, the rotational position sensor for ignition control is accurately positioned at a predetermined circumferential position with respect to the body 13. The cover 53 and the hook portion C73 provide a fitting portion for positioning the sensor unit 41 with respect to the circumferential direction of the rotating electrical machine 10. The fitting portion is provided on the case 51 and the retainer C71.

(13th Embodiment)
This embodiment is a modification based on the preceding embodiment. In the above embodiment, only one retainer C71 is provided. Instead, a plurality of retainers C71 are provided for the case 51 in this embodiment.

FIG. 26 is a plan view corresponding to FIG. As shown in the figure, two retainers C71 can be provided corresponding to one case 51. According to this configuration, the case 51 is securely held. Further, this configuration is suitable for a form having a plurality of legs 361a and 361b as shown in FIG.

Even in this configuration, the cover 53 and the hook portion C73 provide a fitting portion for positioning the sensor unit 41 in the circumferential direction of the rotating electrical machine 10. The fitting portion is provided on the case 51 and the retainer C71.

(14th Embodiment)
This embodiment is a modification based on the preceding embodiment. In the above embodiment, the retainers A71 and B71 are coupled to the corners of the case 51. Instead, in this embodiment, the retainer E71 includes a plurality of hook portions E73 and E78 provided so as to sandwich the case 51.

FIG. 27 is a cross-sectional view corresponding to FIG. The retainer E71 has two hook portions E73 and E78 disposed on both surfaces of the case 51 in the axial direction. The hooks E73 and E78 and the vertical plate 74 hold the case 51. The case 51 is inserted between the two hook portions E73 and E78. These hook portions E73 and E78 receive the case 51 and preliminarily connect the case 51 and the retainer E71. These hook parts E73 and E78 may be provided with protrusions that engage with the case 51. According to this embodiment, the case 51 and the retainer E71 can be connected easily and reliably.

(Fifteenth embodiment)
This embodiment is a modification based on the preceding embodiment. In the tenth embodiment or the like, a fitting portion for positioning the sensor unit 41 in the circumferential direction is provided between the case 51 and the retainer A71. This fitting portion can be provided in various shapes. A fitting part can be provided by the composition explained below, for example. FIG. 28 shows the assembled state of the case 51 and the retainer F71. FIG. 29 shows a disassembled state of the case 51 and the retainer F71.

Case 51 has receiving part F58. The receiving portion F58 is formed as a recess at the corner between the bottom surface and the side surface of the case 51. The receiving portion F58 is a rectangular recess that mainly spreads on the bottom surface. The receiving portion F58 is also opened on the side surface of the case 51 toward the radially outer side.

The retainer F71 has a hook portion F73 extending from the vertical plate portion 74 toward the case 51. The hook part F73 is formed in a curved surface shape. The hook portion F73 is a protrusion that is bent so as to form a main curved surface portion that is bent gently from the vertical plate portion 74 and a protrusion that protrudes toward the case 51 at a substantially central portion of the hook portion F73. And a curved surface portion. The edge of the tip of the hook part F73 is formed in a straight line. Edges at both ends of the hook portion F73 in the circumferential direction of the rotating electrical machine 10 are wavy end surfaces corresponding to the curved surface of the hook portion F73.

The receiving part F58 and the retainer F71 are formed so that the hook part F73 can be received in the receiving part F58. The shape and size of the receiving part F58 are formed so that the hook part F73 fits into the receiving part F58. The shape and size of the receiving portion F58 may be formed so that the hook portion F73 fits into the receiving portion F58 with a slight gap. Regarding the circumferential direction of the rotating electrical machine 10, the width of the receiving portion F <b> 58 is slightly wider than or equal to the width of the hook portion 73. The receiving part F58 and the retainer F71 may be configured to connect the retainer F71 and the case 51 by press-fitting the hook part F73 into the receiving part F58.

In this embodiment, the fitting portion is provided in the case 51 and the retainer F71. The receiving portion F58 and the hook portion F73 provide a fitting portion for positioning the sensor unit 41 in the circumferential direction of the rotating electrical machine 10.

According to this configuration, the case 51 and the sensor unit 41 are positioned in the circumferential direction with respect to the body 13 via the retainer F71. Moreover, the retainer F71 can position the sensor unit 41 more accurately within the range of the core-body error angle. Therefore, the rotational position sensor for ignition control is accurately positioned at a predetermined circumferential position with respect to the body 13.

(Sixteenth embodiment)
This embodiment is a modification based on the preceding embodiment. FIG. 30 shows an assembled state of the case 51 and the retainer G71. FIG. 31 shows a disassembled state of the case 51 and the retainer G71.

The case 51 has a protruding portion G58. The protrusion G58 is formed in the vicinity of the corner of the bottom surface of the case 51. The case 51 has two protrusions G58. The protruding portion G58 is a cylinder protruding by several millimeters from the bottom surface of the case 51.

The retainer G71 has a receiving part G79 in the hook part F73. The receiving part G79 can receive the protrusion part G58. The receiving part G79 is a round hole that penetrates the hook part F73. The retainer G71 has two receiving portions G79 corresponding to the two protruding portions G58.

The receiving part G79 connects the case 51 and the retainer G71 at least in the circumferential direction by receiving the protruding part G58. The shape and size of the protruding portion G58 and the receiving portion G79 are shifted in the circumferential direction between the retainer G71 and the case 51 when the two protruding portions G58 and the two receiving portions G79 are fitted together. Is set to be less than a predetermined value. For example, the shape and size of the protruding portion G58 and the receiving portion G79 are set so that the retainer G71 does not rattle with respect to the case 51 in the circumferential direction.

In this embodiment, the fitting portion is provided in the case 51 and the retainer G71. The protruding part G58 and the receiving part G79 provide a fitting part for positioning the sensor unit 41 in the circumferential direction of the rotating electrical machine 10. Even in this configuration, the rotational position sensor for ignition control is accurately positioned at a predetermined circumferential position with respect to the body 13.

(17th Embodiment)
This embodiment is a modification based on the preceding embodiment. FIG. 32 shows the assembled state of the case 51 and the retainer H71. The case 51 has a protrusion H58. The protruding portion H <b> 58 is formed in the vicinity of the corner portion of the bottom surface of the case 51. Case 51 has one protrusion H58. The protrusion H58 is a prism that protrudes from the bottom surface of the case 51 by a few millimeters.

The retainer H71 has a receiving part H79 in the hook part F73. The receiving part H79 can receive the protrusion H58. The receiving part H79 is a groove extending from the tip of the hook part F73 so as to divide the hook part F73 into two branches. The receiving portion H79 has a width that can receive the protruding portion H58.

The receiving part H79 connects the case 51 and the retainer H71 at least in the circumferential direction by receiving the protruding part H58. The shape and size of the protruding portion H58 and the receiving portion H79 are less than the predetermined deviation in the circumferential direction between the retainer H71 and the case 51 when the protruding portion H58 and the receiving portion H79 are fitted together. It is set to be suppressed. For example, the shape and size of the protruding portion H58 and the receiving portion H79 are set so that the retainer H71 does not rattle with respect to the case 51 in the circumferential direction. In this embodiment, the fitting portion is provided on the case 51 and the retainer H71.

The protruding portion H58 and the receiving portion H79 provide a fitting portion for positioning the sensor unit 41 with respect to the circumferential direction of the rotating electrical machine 10. Even in this configuration, the rotational position sensor for ignition control is accurately positioned at a predetermined circumferential position with respect to the body 13.

(Other embodiments)
The invention disclosed herein is not limited to the embodiments for carrying out the invention, and can be implemented with various modifications. The disclosed invention is not limited to the combinations shown in the embodiments, and can be implemented in various combinations. Embodiments can have additional parts. The portion of the embodiment may be omitted. The parts of the embodiments can be replaced or combined with the parts of the other embodiments. The structure, operation, and effect of the embodiment are merely examples. The technical scope of the disclosed invention is not limited to the description of the embodiments. Some technical scope of the disclosed invention is indicated by the description of the claims, and should be understood to include all modifications within the meaning and scope equivalent to the description of the claims. It is.

For example, in the above embodiment, the sensor unit includes both a rotational position sensor for motor control and a rotational position sensor for ignition control. Instead, the sensor unit can be configured to include at least one of a rotational position sensor for motor control and a rotational position sensor for ignition control. For example, the sensor block may include only a rotational position sensor for motor control.

Further, the tip portions 64 and 264 can adopt various shapes such as a cylindrical shape, a columnar shape, and a plurality of protruding piece shapes. In addition to the above embodiment, the portions other than the tip 64 may be formed so as not to be deformed or buckled by the pressing force when the stator 31 is fixed to the body 13. The portions other than the tip portion 64 can be formed so as to suppress plastic deformation or not to plastically deform after the tip portion 64 is completely deformed and buckled. For example, without providing the taper portion 63, the thick base portion 62 can be configured to contact the body 13 after the entire distal end portion 64 is buckled.

In the above-described embodiment, a leg portion that narrows from the base portion such as a conical shape or a hemispherical shape toward the tip is employed. The shape of the leg is not limited to the illustrated embodiment, and various shapes can be employed. For example, a truncated cone shape, a pyramid shape, a pyramid shape, a stepped pyramid shape, or the like can be adopted as the shape of the leg portion.

Further, instead of the illustrated reinforcing portion 57, a buckling prevention portion such as a rib giving a larger cross-sectional area may be provided. Further, a portion of the case 51 that contacts the stator 31, for example, the cover 53, may be provided with a cross-sectional area that does not buckle with a normal pressing force that can be generated after the tip end portion 64 is completely buckled.

In the above embodiment, the positioning portion 415 is provided by a round hole. Alternatively, the positioning portion may be provided by an elongated groove extending in the radial direction. Thereby, the sensor unit 41 can be positioned only in the circumferential direction. Further, the positioning part may be provided by an elongated groove extending in the circumferential direction. Thereby, the sensor unit 41 can be positioned only in the radial direction.

Claims (10)

1. A rotor (21) in which a permanent magnet (23) for providing a field is disposed on an inner surface of a rotor yoke (22) connected to a rotating shaft of the internal combustion engine (12);
   A stator core (32) that is disposed on the inner side of the rotor by being fixed to the body (13) of the internal combustion engine (12) and that forms a plurality of magnetic poles (32a) facing the permanent magnet on the radially outer side. A stator (31);
   A sensor unit (41) disposed between the magnetic poles, having a rotational position sensor (43) for detecting a rotational position of the rotor by detecting a magnetic flux of the permanent magnet, and being fixed to the stator;
   A rotating electrical machine for an internal combustion engine, comprising: a retainer (71, A71, B71, C71, E71, F71, G71, H71) that is formed of a metal plate and presses the sensor unit toward the body.
2. The retainer includes a fixing portion (72) fixed to the body, a hook portion (73, C73, E73, F73) positioned on a surface of the sensor unit facing the stator, the fixing portion and the hook portion. 2. The rotating electrical machine for an internal combustion engine according to claim 1, wherein the sensor unit is pressed toward the body by being elastically deformed.
3. 3. The rotating electrical machine for an internal combustion engine according to claim 1, wherein the retainer can be preliminarily connected to the sensor unit.
4. The sensor unit and the retainer (A71, B71, C71, F71, G71, H71) are fitted portions (A58, A76; B58, 73) for positioning the sensor unit with respect to the circumferential direction of the rotating electrical machine for the internal combustion engine. B77; 53, C73; F73, F58; G58, G79; H58, H79). The rotary electric machine for an internal combustion engine according to any one of claims 1 to 3.
5. The rotating electrical machine for an internal combustion engine according to claim 4, wherein the fitting portion positions the sensor unit within an error angle inevitably generated between the stator core and the body.
6. The sensor unit includes leg portions (61, 261, 361a, 361b, 561, 661, 761, 861) that are deformable in an axial direction by being pressed against the body. 5. The rotating electrical machine for an internal combustion engine according to claim 5.
7. The sensor unit is
   A tightening portion (54) which is provided radially inward with respect to the radial direction of the rotating electrical machine for the internal combustion engine and is fastened to the stator by a fixing bolt (44);
   A cover (53) that is provided radially outside, accommodates the rotational position sensor, and is inserted into a gap (32b) between the magnetic poles;
   The cover has a step portion (53c) that regulates an insertion amount of the cover by contacting the stator,
   The leg is provided on the radially outer side,
   The rotating electrical machine for an internal combustion engine according to claim 6, wherein the sensor unit contacts the stator at the stepped portion and contacts the body at the leg portion.
8. The sensor unit is
   A case (52) having a container (52) for accommodating a circuit component (42) connected to the rotational position sensor, and a connecting part (55) for connecting the container and the tightening part;
   The cover is formed to extend from the bottom surface of the container,
   The leg is provided at the edge of the open end of the container;
   The rotating electrical machine for an internal combustion engine according to claim 7, wherein the container, the tightening portion, the connecting portion, the cover, and the leg portion are integrally formed of the same resin material.
9. The sensor unit has a plurality of the covers,
   The rotating electrical machine for an internal combustion engine according to claim 7 or 8, wherein the retainer is disposed between two adjacent covers.
10. 10. The internal combustion engine according to claim 1, wherein the retainer presses a radially outer portion of the sensor unit toward the body with respect to a radial direction of the rotating electrical machine for the internal combustion engine. Rotating electric machine.

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