JP2016045084A - Detection sensor and starter generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a fitting work and to reduce the number of components and a work man-hour.SOLUTION: A starter generator includes: a detection sensor (30) mounted on a starter generator including a stator (10) in which a plurality of tees (12) wound with coils are arranged in a circumferential direction and a rotor arranged with magnets so as to face the outer periphery of the stator and detecting a rotational position of the rotor rotating around the stator; a sensor case(32) extending to an outer peripheral side from a center side of the stator; an erected part (33) erected from the sensor case so as to enter between the adjacent tees at the outer peripheral side of the stator; and a sensor element arranged at the erected part so as to detect a change of a magnetic field followed by the rotation of the rotor. A sensor case is formed with a fixing part (34) fixed to the center side of the stator, and a top end side of the erected part is formed with a pair of projections (37) engaged with the stator.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a detection sensor and a starter generator provided in an engine of a motorcycle.

  Conventionally, a starter generator that functions as a starter motor when the engine is started and functions as a generator after the engine is started (see, for example, Patent Document 1). The starter generator is configured as a brushless type rotating machine in which a rotor connected to an engine drive shaft can rotate around a stator fixed to an engine case. When starting the engine, the coil wound around each tooth of the stator is energized to rotate the rotor with the magnet and start the engine. By rotating the periphery, an electromotive force is generated in each coil of the stator to generate power.

  This starter / generator is provided with a detection sensor for detecting the rotational position of the rotor in order to adjust the energization timing of the coil when starting the engine. The detection sensor is provided with a plurality of sensor elements such as Hall ICs, and the rotational position of the rotor is detected by detecting a change in the magnetic field accompanying the rotation of the rotor by the plurality of sensor elements. The sensor case of the detection sensor is formed in a substantially fan shape that extends from the vicinity of the center of the stator to the outer peripheral side, with a plurality of sensor elements positioned between the stator teeth on the outer peripheral side, and the sensor elements facing the rotor magnet. Changes in the magnetic field are detected.

Japanese Patent No. 5064279

  Incidentally, in the detection sensor described in Patent Document 1, the sensor case is screwed with a bolt on the center side of the stator, and the sensor case is screwed with the engine case on the outer peripheral side of the stator with a bolt. This makes it possible to stably attach the detection sensor to the starter generator, but the number of screwing points with bolts increases, and the attachment work becomes complicated due to interference between the bolts and other members. As the number of bolts increases, the number of work steps increases and the cost increases.

  This invention is made | formed in view of this point, and it aims at providing a detection sensor and a starter generator which can simplify an attachment operation | work and can reduce a number of parts and work man-hours.

  The detection sensor of the present invention is attached to a starter generator including a stator in which a plurality of teeth wound with a coil are arranged in the circumferential direction and a rotor in which a magnet is disposed so as to face the outer periphery of the stator. A detection sensor for detecting a rotational position of the rotor that rotates around the stator, between a sensor case extending from a center side of the stator toward an outer peripheral side and the teeth adjacent on the outer peripheral side of the stator. A standing portion that stands up from the sensor case so as to enter; and a sensor element that is disposed in the standing portion so as to detect a change in magnetic field accompanying rotation of the rotor. The fixing part fixed to the side is formed, The engaging part engaged with the said stator is formed in the said standing part, It is characterized by the above-mentioned.

  According to this configuration, the fixed portion of the sensor case is fixed on the center side of the stator, and the standing portion that has entered between adjacent teeth is prevented from coming off by the engaging portion on the outer peripheral side of the stator. Since the sensor case is held at two locations on the center side and the outer peripheral side of the stator, the detection sensor can be stably attached to the starter generator. Moreover, since the sensor case can be attached to the stator without using bolts on the outer peripheral side of the stator, the attaching operation can be simplified. Costs can be reduced by omitting the bolting operation on the outer peripheral side of the stator and reducing the number of bolts.

  In the detection sensor of the present invention, the upright portion penetrates between the adjacent teeth in the axial direction, and the engaging portion engages with the outer surface of the stator on the distal end side of the upright portion. According to this configuration, the upright portion can be prevented from coming off without changing the shape of the stator because the front end of the upright portion that penetrates the adjacent teeth engages the outer surface of the stator.

  In the detection sensor of the present invention, the engaging portion is a protrusion protruding in the circumferential direction from the distal end side of the standing portion. According to this configuration, since the protrusion at the tip of the upright portion is caught by the teeth and is prevented from being detached, the sensor case can be held on the outer peripheral side of the stator with a simple configuration. In addition, when the standing part is inserted between adjacent teeth, the protrusion of the standing part becomes a sliding surface with respect to the tooth, and the contact area between the standing part and the tooth is minimized to press fit between the teeth with a weak force. be able to.

  In the detection sensor of the present invention, the adjacent teeth are formed with recesses that engage with the protrusions. According to this configuration, the protrusion at the tip of the standing portion enters the recess of the tooth, thereby preventing the standing portion from coming off and positioning the standing portion between adjacent teeth.

  The starter generator according to the present invention includes the detection sensor, the stator, and the rotor. According to this configuration, the work of assembling the starter generator with respect to the engine case can be simplified.

  According to the detection sensor of the present invention, the fixing of the sensor case is fixed to the center side of the stator and is engaged with the outer peripheral side of the stator by the engaging portion provided on the standing portion. The fastening operation can be omitted and the number of bolts can be reduced to reduce the cost.

It is sectional drawing of the starter generator with which the detection sensor which concerns on this Embodiment was assembled | attached. It is sectional drawing of the starter generator with which the detection sensor which concerns on a comparative example was assembled | attached. It is a perspective view of the detection sensor which concerns on this Embodiment. It is a plane schematic diagram of the detection sensor which concerns on this Embodiment. It is explanatory drawing of the attachment operation | work of the sensor case which concerns on this Embodiment.

  Hereinafter, the present embodiment will be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a starter generator to which a detection sensor according to the present embodiment is assembled. The detection sensor and the starter generator according to the present embodiment are merely examples, and can be changed as appropriate. Moreover, the detection sensor and starter generator according to the present embodiment are not limited to motorcycles but can be applied to four-wheeled vehicles, outboard motors, and the like.

  As shown in FIG. 1, a starter generator 1 is connected to the tip of a drive shaft 4 protruding from an engine case 3 of a motorcycle, functions as a starter motor when the engine 2 starts, and generates power after the engine 2 starts. It functions as a machine. The starter generator 1 is configured by rotatably arranging a rotor 20 fixed to a drive shaft 4 of an engine 2 around a stator 10 fixed to an engine case 3. In the stator 10, a plurality of steel plates are laminated, and an annular portion 11 fixed to the engine case 3 around the drive shaft 4 and a plurality of teeth 12 extending in the radial direction from the annular portion 11 are formed.

  The annular portion 11 has an opening through which the drive shaft 4 of the engine 2 is inserted at the center, and a plurality of (only one shown) through holes 13 corresponding to the screw holes of the engine case 3 are formed around the opening. Yes. The stator 10 is fixed to the engine case 3 around the drive shaft 4 by tightening a plurality of (only one shown) bolts 19 inserted into the through holes 13 into the screw holes of the engine case 3. The plurality of teeth 12 are formed in a substantially T shape when viewed from the axial direction by a leg portion 14 extending from the annular portion 11 to the outer peripheral side and a flange portion 15 extending in the circumferential direction on the distal end side of the leg portion 14 ( (See FIG. 4B). The circumference of the leg portion 14 of each tooth 12 is covered with a thin insulator 16 such as a synthetic resin.

  A coil 17 is wound around the leg portion 14 of each tooth 12, and the coil 17 is insulated from the stator 10 by an insulator 16 that covers the surface of the leg portion 14. The teeth 12 around which the coil 17 is wound are arranged in the circumferential direction, and a predetermined interval (see FIG. 5) is provided between the flange portions 15 of the adjacent teeth 12. Each coil 17 is connected to the battery 5 via the controller 6, and the controller 6 controls energization from the battery 5 to the coil 17 and charging from the coil 17 to the battery 5. A plurality of coils 17 are circumferentially arranged around the drive shaft 4 of the engine 2 by the stator 10.

  The rotor 20 includes an annular yoke 21 having a U-shaped cross section that covers the stator 10, and a magnet 22 that forms a magnetic circuit together with the yoke 21. The yoke 21 is formed in a bottomed cylindrical shape in which an inner wall portion 23 and an outer wall portion 24 that are radially opposed to each other with the stator 10 interposed therebetween are connected by a bottom wall portion 25. The rotor 20 is configured to rotate integrally with the drive shaft 4 of the engine 2 by the inner wall 23 of the yoke 21 being screwed to the drive shaft 4 of the engine 2 by a bolt 29. A plurality of magnets 22 are arranged on the inner peripheral surface of the outer wall portion 24 of the yoke 21 so as to face the outer periphery of the stator 10 with a slight gap.

  The magnet 22 and the inner wall portion 23 of the yoke 21 face each other with the stator 10 interposed therebetween, so that a magnetic flux is generated from the magnet 22 through the coil 17 toward the inner wall portion 23. For this reason, when the starter generator 1 functions as a starter, the drive current is supplied from the battery 5 to the coil 17 via the controller 6, thereby causing the magnetic field in the rotor 20 and the current flowing in the coil 17 to act. The rotor 20 is rotated and the engine 2 is started. On the other hand, when the starter generator 1 functions as a generator, an electromotive force is generated when the coil 17 crosses the magnetic flux from the magnet 22 toward the inner wall 23 of the yoke 21, and the electromotive force is generated from the coil 17 via the controller 6. Then, electric power is supplied to the battery 5.

  In addition, a detection sensor 30 that detects the rotational position of the rotor 20 that rotates around the stator 10 is attached to the starter generator 1. The detection sensor 30 detects a change in the magnetic field accompanying the rotation of the rotor 20 by a sensor element 31 (see FIG. 4) such as a Hall IC. The detection sensor 30 is connected to the controller, and the start timing of the engine 2 is controlled according to the detection signal of the rotor 20 input from the detection sensor 30 to the controller. The sensor case 32 of the detection sensor 30 is formed in a substantially fan shape extending from the center side to the outer periphery side of the stator 10 (see FIG. 4B), and a plurality of upright portions provided with sensor elements 31 on the outer periphery side of the sensor case 32. 33 stands from the sensor case 32.

  When the detection sensor 30 having this shape is attached to the starting generator 1, it is desired that not only the center side of the sensor case 32 but also the outer peripheral side be fixed to the stator 10. However, although a space for screwing the sensor case 32 can be secured on the center side of the stator 10, a space for screwing cannot be secured on the outer peripheral side of the stator 10. For this reason, normally, as in the comparative example shown in FIG. 2, a nut 45 is disposed on the center side of the sensor case 42, and the center side of the sensor case 42 is screwed to the stator 10. A bracket 43 is provided on the engine case 3, and the bracket 43 is screwed to the engine case 3.

  In the detection sensor 40 according to the comparative example, the sensor case 42 has to be screwed to the stator 10 and the engine case 3 respectively, and the installation work is complicated. For this reason, the number of bolts is increased, the number of work steps is increased, and the cost is increased. Therefore, in the detection sensor 30 according to the present embodiment, the standing portion 33 on the outer peripheral side of the sensor case 32 is made to penetrate between the adjacent teeth 12 of the stator 10 and is engaged with the stator 10 on the tip side of the standing portion 33. ing. Thereby, the sensor case 32 is engaged on the outer peripheral side of the stator 10 where a space for screwing cannot be secured, and the sensor case 32 is held by both ends.

  Hereinafter, the detection sensor according to the present embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is a perspective view of the detection sensor according to the present embodiment. FIG. 4 is a schematic plan view of the detection sensor according to the present embodiment. 4A is a schematic side view of the detection sensor, and FIG. 4B is a schematic top view of the detection sensor. In FIG. 4B, the outer shape of the stator is indicated by a two-dot chain line for convenience of explanation.

  As shown in FIGS. 3 and 4, the sensor case 32 of the detection sensor 30 is provided with a narrow arc-shaped fixing portion 34 on the inner peripheral side of a wide arc-shaped case body 38 with synthetic resin or the like, as viewed from above. It is formed in a substantially fan shape. A fixing portion 34 is provided on the inner peripheral surface of the case main body 38 via a pair of arms 35, and a screw fixing nut 36 is insert-molded in the fixing portion 34. The fixing portion 34 is lifted from one surface of the case main body 38 on the stator 10 side, and is formed so as to be able to contact the surface of the annular portion 11 of the stator 10 (see FIG. 1). As described above, the fixing portion 34 that is fixed to the annular portion 11 of the stator 10 is formed on the center side of the sensor case 32.

  On the outer peripheral side of the sensor case 32, a plurality of (four in the present embodiment) standing portions 33 stand up from the case body 38 so as to enter between the five teeth 12 arranged in the circumferential direction. Each upright portion 33 is formed in a plate shape that is long in the axial direction, and has such a length as to enter between the adjacent teeth 12 to the back in the axial direction. Further, the standing portion 33 has a width corresponding to the interval between the flange portions 15 of the adjacent teeth 12, and has a thickness corresponding to the flange portion 15 of the teeth 12. Thus, the standing part 33 is formed so as to fill the gap between the flange parts 15 of the adjacent teeth 12.

  A pair of protrusions 37 project in a semicircular shape in the circumferential direction from the side surface at the leading end side of each standing portion 33 and are formed to be engageable with a recess 26 (see FIG. 5) of the tooth 12 described later. When the pair of protrusions 37 are caught in the recesses 26 of the teeth 12, the standing portions 33 are prevented from coming off between the adjacent teeth 12. The upright portion 33 is inserted in the axial direction with respect to the flange portion 15 of the adjacent tooth 12, but can be press-fitted by slightly crushing the pair of protrusions 37. At this time, by forming the pair of protrusions 37 in a semicircular shape, the contact area when the standing portion 33 is inserted between the flange portions 15 of the adjacent teeth 12 is minimized.

  Further, the pair of protrusions 37 are made of synthetic resin having high slipperiness, and the frictional force with the contact surface of the teeth 12 is suppressed. Therefore, since the contact area of the protrusion 37 is minimal and the slipperiness is high, the upright portion 33 can be press-fitted between the adjacent teeth 12 with a weak force. In each standing portion 33, a sensor element 31 is disposed so as to detect a change in magnetic field between the teeth 12. Since each standing portion 33 is positioned between the flange portions 15 of the teeth 12, each sensor element 31 is opposed to the magnet 22 of the rotor 20 (see FIG. 1) with a slight gap therebetween.

  When the detection sensor 30 is attached to the stator 10, on the center side of the sensor case 32, a bolt 39 (see FIG. 1) is inserted into the through hole 18 (see FIG. 1) of the annular portion 11 of the stator 10. It is fastened to the nut 36 of the case 32. Further, on the outer peripheral side of the sensor case 32, each standing portion 33 is inserted between the teeth 12, and a pair of protrusions 37 engage with the concave portion 26 (see FIG. 5) of the teeth 12 on the leading end side of the standing portion 33. The stator 10 is prevented from coming off. Therefore, by screwing only the center side of the sensor case 32 to the stator 10, the center side and the outer periphery side of the sensor case 32 are fixed to the stator 10 without screwing the outer periphery side of the sensor case 32 to the stator 10. It can be attached.

  Hereinafter, with reference to FIG. 5, an operation for attaching the sensor case to the stator will be described. FIG. 5 is an explanatory diagram of the mounting operation of the sensor case according to the present embodiment. 5A and 5B show a sensor case mounting operation on the outer peripheral side of the stator, and FIG. 5C shows a sensor case mounting operation on the center side of the stator. In FIG. 5, for convenience of explanation, the sensor case side of the stator is described as the lower side, and the opposite side is described as the upper side. In FIG. 5, some members of the stator and the sensor case are omitted.

  As shown in FIG. 5A, the flange portion 15 of each tooth 12 of the stator 10 has a height and thickness corresponding to the upright portion 33 of the detection sensor 30, and the gap between the flange portions 15 of adjacent teeth 12 is between. An interval corresponding to the width of the upright portion 33 is provided. In the adjacent teeth 12 into which the upright portions 33 are inserted, the upper corners of the flange portions 15 are cut out to form concave portions 26. The recessed portion 26 is cut out in an inverted R shape so as to engage with a protrusion 37 protruding in a semicircular shape from the standing portion 33. In this manner, a slot into which the standing portion 33 can be inserted is formed between the flange portions 15 of the adjacent teeth 12.

  When attaching the detection sensor 30 to the tooth 12, first, the leading end side of each standing portion 33 of the detection sensor 30 is positioned between the flange portions 15 of the adjacent teeth 12. And it inserts from the front end side of the standing part 33 between the adjacent collar parts 15. Since the pair of protrusions 37 is formed on the distal end side of the standing part 33, the standing part 33 is inserted while the pair of protrusions 37 are crushed between the adjacent flange parts 15. At this time, since the pair of protrusions 37 are formed in a semicircular shape, the contact area with the tooth 12 is minimized, and the pair of protrusions 37 is formed of a synthetic resin having slipperiness. Therefore, it is possible to press fit between the flanges 15 of the adjacent teeth 12 with a small force while suppressing the resistance to the insertion of the standing portion 33.

  As shown in FIG. 5B, when the tip end side of the upright portion 33 penetrates between the flange portions 15 of the adjacent teeth 12 in the axial direction, the crushed protrusion 37 is restored to the original shape and becomes the concave portion 26 of the flange portion 15. Engaged. When the pair of protrusions 37 are engaged with the recesses 26 of the teeth 12, the upright portions 33 are prevented from coming off between adjacent teeth 12. Moreover, the standing part 33 can be positioned in the circumferential direction between the adjacent teeth 12 by the engagement of the pair of protrusions 37 and the recess 26 of the tooth 12. Therefore, the positional deviation of the standing part 33 between the adjacent teeth 12 is suppressed, and the detection accuracy by the sensor element 31 (see FIG. 4) is increased.

  As shown in FIG. 5C, when the standing portion 33 is inserted between the predetermined teeth 12, the fixing portion 34 of the sensor case 32 is brought into contact with the annular portion 11 of the stator 10. Thereby, the nut 36 (see FIG. 4) of the fixing portion 34 of the sensor case 32 is positioned in the through hole 18 (see FIG. 1) formed in the annular portion 11 of the stator 10. In this state, a bolt 39 (see FIG. 1) is inserted into the through hole 18 of the annular portion 11, and the tip of the bolt 39 is fastened to the nut 36 of the fixing portion 34, so that the sensor case 32 is fixed inside the stator 10. Is done. In this way, the sensor case 32 of the detection sensor 30 is attached at two locations on the center side and the outer peripheral side of the stator 10.

  In this case, unlike the comparative example shown in FIG. 2, it is only necessary to insert the standing portion 33 on the outer peripheral side of the sensor case 32 into the stator 10 and screw only the center side of the sensor case 32 with the bolts 39. Can be simplified. Moreover, since the sensor case 32 can be attached to the stator 10 with only one screwing, the number of parts can be reduced. Furthermore, since screwing to the engine case 3 is unnecessary, there is no need to provide a bracket 43 like the sensor case 42 shown in the comparative example (see FIG. 2), and the detection sensor 30 can be downsized.

  As described above, according to the present embodiment, the fixed portion 34 of the sensor case 32 is fixed on the center side of the stator 10, and a pair of upright portions 33 that enter between adjacent teeth 12 on the outer peripheral side of the stator 10. Is prevented by the projection 37. Since the sensor case 32 is held at two locations on the center side and the outer periphery side of the stator 10, the detection sensor 30 can be stably assembled to the starter generator 1. Moreover, since the sensor case 32 can be attached to the stator 10 without using the bolt 39 on the outer peripheral side of the stator 10, the attaching operation can be simplified. The cost can be reduced by omitting the fastening operation of the bolts 39 on the outer peripheral side of the stator 10 and reducing the number of the bolts 39.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, in the above-described embodiment, the engaging portion that engages with the stator 10 is configured by the pair of protrusions 37 protruding from the standing portion 33, but the configuration is not limited thereto. The engaging portion only needs to have a configuration that can be engaged with the stator 10. For example, the engaging portion may be configured to be frictionally engaged, adhesively engaged, or magnetically engaged. Further, the stator 10 may be configured to engage with the stator 10 instead of the pair of protrusions 37.

  In the above-described embodiment, the protrusion 37 is formed in a semicircular shape, but the present invention is not limited to this structure. The protrusion 37 may be configured in any way as long as it has a size and shape that can penetrate between adjacent teeth 12.

  Further, in the above-described embodiment, the detection sensor 30 has the four upright portions 33, but the number of the upright portions 33 is not particularly limited. Further, the pair of protrusions 37 is formed on each standing part 33, but the protrusions 37 may be formed on at least one standing part 33.

  Further, in the above-described embodiment, the concave portion 26 that engages with the protrusion 37 of the standing portion 33 is formed in the tooth 12, but the configuration is not limited thereto. For example, if the standing portion 33 is configured to penetrate between adjacent teeth 12 in the axial direction, the pair of protrusions 37 can be engaged with the teeth 12 without forming the recess 26.

  In the above-described embodiment, the corners of the flange portion 15 of the tooth 12 are notched to form the inverted R-shaped concave portion 26. However, the present invention is not limited to this configuration. The recess 26 may be any size and shape that can be engaged with the pair of protrusions 37.

  Further, in the above-described embodiment, the projection 37 is formed on the tip end side of the upright portion 33 and the recess 26 is formed at the corner of the flange portion 15 of the tooth 12. However, the present invention is not limited to this configuration. As long as the position of the protrusion 37 of the standing portion 33 corresponds to the position of the recessed portion 26 of the tooth 12, the protrusion 37 may be formed at any position of the standing portion 33, and the recessed portion 26 is formed at any position of the flange portion 15. May be.

  In the above-described embodiment, the rotor 20 is provided with the plurality of magnets 22, but is not limited to this configuration. For example, instead of providing a plurality of magnets 22, an annular magnet magnetized so as to have different polarities alternately in the circumferential direction may be used.

  In the above-described embodiment, the sensor case 32 is formed in a substantially fan shape, but is not limited to this configuration. The sensor case 32 may be formed so as to extend from the center side of the stator 10 toward the outer peripheral side.

  As described above, the present invention has an effect that the mounting work can be simplified and the number of parts and work man-hours can be reduced, and in particular, a detection sensor and a starter generator provided in an engine of a motorcycle. Useful for.

DESCRIPTION OF SYMBOLS 1 Starter generator 10 Stator 11 Annular part 12 Teeth 14 Leg part 17 Coil 20 Rotor 21 Yoke 22 Magnet 26 Recess 30 Detection sensor 31 Sensor element 32 Sensor case 33 Standing part 34 Fixing part 37 Protrusion

Claims (5)

Mounted on a starter generator having a stator in which a plurality of teeth around which coils are wound are arranged in the circumferential direction and a rotor on which a magnet is disposed so as to face the outer periphery of the stator, and rotates around the stator A detection sensor for detecting a rotational position of the rotor,
A sensor case extending from the center side of the stator toward the outer peripheral side;
An upright portion erected from the sensor case so as to enter between adjacent teeth on the outer peripheral side of the stator;
A sensor element disposed on the upright portion so as to detect a change in the magnetic field accompanying the rotation of the rotor;
The sensor case is formed with a fixing portion that is fixed to the center side of the stator, and the rising portion is formed with an engaging portion that engages with the stator.   2. The detection sensor according to claim 1, wherein the upright portion penetrates between adjacent teeth in an axial direction, and the engaging portion engages with an outer surface of the stator on a front end side of the upright portion.   The detection sensor according to claim 1, wherein the engagement portion is a protrusion protruding in a circumferential direction from a distal end side of the standing portion.   The detection sensor according to claim 3, wherein a concave portion that engages with the protrusion is formed in the adjacent teeth.   A starter generator comprising the detection sensor according to any one of claims 1 to 4, the stator, and the rotor.

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