JP2014168350A - Sensor installation structure of engine unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor installation structure of an engine unit capable of being employed even under an environment in which an inside of an engine cover easily becomes high temperature and enhancing a degree of freedom of designs of a hall IC unit and a surroundings thereof.SOLUTION: A hall IC unit 57 is installed at an outside of an engine cover 51. A magnetic flux induction rod 70 that extends from a neighborhood part of a magnetic flux detection part of the hall IC unit 57 to a neighborhood part of a magnetic pole of a stator 53 that receives a magnetic force of a permanent magnet 54 on a rotor 52 or a neighborhood part of a passage trajectory of the rotor 52 is provided.

Description

  The present invention relates to an engine unit sensor installation structure in which a position detection sensor for detecting the rotational position of a rotor of a rotating electrical machine is arranged at a position adjacent to a crankcase.

2. Description of the Related Art As an engine unit for a motorcycle or the like, there is known one that uses a rotating electric machine for AC power generation provided on one end side in the axial direction of a crankshaft as a starting motor for starting the engine.
When a rotating electrical machine for AC power generation is used for this type of application, in order to drive the rotating electrical machine smoothly, the stator side U-phase, V-phase, and W-phase are driven according to the moving position of the permanent magnet on the rotor. It is necessary to energize each magnetic pole coil at an appropriate timing. For this reason, in the rotary electric machine used for this kind of application, the position detection sensor for detecting the rotation position of a rotor is provided (for example, refer patent document 1).

In the rotating electrical machine described in Patent Document 1, permanent magnets are attached to the inner peripheral surface of a bottomed cylindrical rotor coupled to the end of the crankshaft so that different magnetic pole surfaces appear alternately along the circumferential direction. At the same time, the stator is disposed in the non-rotating portion inside the rotor so that the permanent magnet on the rotor side and the magnetic pole face each other. The stator of this rotating electrical machine has a plurality of teeth extending radially, and a three-phase coil is wound around a predetermined tooth. In this rotating electrical machine, a Hall IC unit is attached as a sensor for detecting a change in magnetic flux near the tip of the magnetic pole (tooth) of each phase of U, V, and W, and a signal output from the Hall IC unit is received. Based on this, the position of the magnet, that is, the rotational position of the rotor is detected. The Hall IC unit is configured by embedding Hall IC elements in a resin.
In the case of the rotating electrical machine described in Patent Document 1, a bottomed cylindrical rotor is attached to the end of the crankshaft so that the opening side of the rotor faces the crankcase side. The Hall IC unit attached to is attached to the outer surface of the wall of the crankcase. The outer surfaces of the stator and the rotor are covered with an engine cover attached to the wall of the crankcase.

JP 2010-200421 A

However, in the case of an engine unit in which the rotating electrical machine is mounted, since the Hall IC unit is attached together with the stator in a space surrounded by the crankcase and the engine cover, high-temperature lubricating oil is discharged from the crankcase to the engine. In an environment that flows into the cover, it is necessary to consider the durability of the resin that embeds the element of the Hall IC that detects a change in magnetic flux.
In addition, the engine unit on which the above rotating electrical machine is mounted is designed so that the Hall IC unit is mounted in a limited space on the tip side of the stator teeth, so the shape, size, and mounting site of the Hall IC unit are limited. The degree of freedom is expected.

  Therefore, the present invention is intended to provide a sensor installation structure for an engine unit that can be employed even in an environment where the inside of the engine cover is likely to be hot and can increase the degree of freedom in design of the Hall IC unit and the engine cover. .

The engine unit sensor installation structure according to the present invention employs the following configuration in order to solve the above problems.
The invention according to claim 1 is a rotating electrical machine (50) having a rotor (52) attached to an end of a crankshaft (16) and a stator (53) attached to a non-rotating part adjacent to the rotor (52). A position detection sensor (58) for detecting the rotational position of the rotor (52), a crankcase (17) for rotatably supporting the crankshaft (16), and the crankcase (17) attached to the crankcase (17) An engine cover (51) covering the end of the shaft (16) and the outside of the rotating electrical machine (50), and the position detection sensor (58) is a permanent magnet (54) provided on the rotor (52). ) And a Hall IC unit (57) for detecting a change in magnetic flux according to the rotational position of the permanent magnet (54) on the rotor (52). In the installation structure, the Hall IC unit (57) is installed outside the engine cover (51), and the permanent magnet on the rotor (52) is provided from the vicinity of the magnetic flux detection unit of the Hall IC unit (57). High magnetic permeability magnetic flux guiding member (70) extending in the vicinity of the magnetic pole (55a) of the stator (53) that receives the magnetic force of the magnet (54) or in the vicinity of the passing path of the permanent magnet (54). Is provided.
As a result, the change in the magnetic flux accompanying the rotation of the permanent magnet on the rotor side is detected by the Hall IC unit outside the engine cover through the magnetic flux guiding member.

According to a second aspect of the present invention, in the engine unit sensor installation structure according to the first aspect, the magnetic flux guiding member (70) is arranged across the butted portion of the engine cover (51) and the crankcase (17). And a seal member (62) is interposed between the magnetic flux guide member (70) and the abutting portion.
Thereby, leakage of the lubricating oil or the like through the gap between the abutting portion and the magnetic flux guiding member is prevented by the seal member. Further, at the time of assembly, with the seal member mounted on the outer surface of the magnetic flux guide member, the magnetic flux guide member is set across the abutting portion, and the engine cover can be attached to the crankcase in that state.

The invention according to claim 3 is the engine unit sensor installation structure according to claim 1 or 2, wherein the Hall IC unit (57) is covered by a cover member (60), and the cover member (60) is the engine cover. (51) and at least one of the crankcase (17).
As a result, the Hall IC unit can be easily attached to the engine cover or the crankcase via the cover member.

According to a fourth aspect of the present invention, in the engine unit sensor installation structure according to any one of the first to third aspects, the permanent magnet (54) provided on the rotor (52) has a different magnetic pole surface on the rotor ( 52) When magnetized so as to appear alternately in the circumferential direction and function as a rotating electrical machine, magnetic flux enters and exits between the U-phase, V-phase, and W-phase magnetic poles of the stator (53). The magnetic flux guiding member (70) is provided corresponding to the magnetic flux entering / exiting positions of the magnetic poles of the U-phase, V-phase, and W-phase, respectively. .
Thus, the timing at which the rotor-side permanent magnet passes in the vicinity of the U-phase, V-phase, and W-phase magnetic poles is detected by the Hall IC unit through the magnetic flux guiding member corresponding to each magnetic pole.

According to a fifth aspect of the present invention, in the sensor unit sensor installation structure according to any one of the first to fourth aspects, the one end side of the magnetic flux guiding member (70) is connected to the magnetic pole (55a) of the stator (53). While being attached, the vicinity of the other end is sandwiched and supported between the engine cover (51) and the crankcase (17).
As a result, the magnetic flux guiding member is stably supported by the magnetic poles of the stator and the joint portion of the engine cover.

According to a sixth aspect of the present invention, in the engine unit sensor installation structure according to any one of the first to fifth aspects, the stator (53) includes the engine cover (51) and the crankcase (17). An arm member (90) extending outside the engine cover (51) across the butting portion is integrally attached, and the magnetic flux guiding member (170) is attached along the arm member (90). It is characterized by being.
As a result, the magnetic flux guiding member is stably supported by the arm member integrally attached to the stator.

  According to the present invention, the Hall IC unit installed outside the engine cover detects a change in magnetic flux accompanying the rotation of the rotor through the magnetic flux guiding member. Even in an environment where the temperature tends to be high, the Hall IC unit can be employed without being placed in that environment. In addition, according to the present invention, since the Hall IC unit is not installed at a limited narrow specific position in the engine cover, the degree of freedom in designing the Hall IC unit and the engine cover can be increased.

1 is a side view of a motorcycle according to an embodiment of the present invention. It is sectional drawing corresponding to the AA cross section of FIG. 1 of the engine unit of 1st Embodiment of this invention. It is sectional drawing to which a part of FIG. 2 was expanded. FIG. 2 is an enlarged side view of a part of the engine unit shown in FIG. 1. It is a figure corresponding to B arrow of FIG. It is sectional drawing corresponding to the DD cross section of FIG. It is sectional drawing corresponding to FIG. 3 of 2nd Embodiment of this invention. It is a side view corresponding to FIG. 4 of 2nd Embodiment of this invention. It is a figure which shows the polarity of the permanent magnet seen from the same direction as FIG. 8 of 2nd Embodiment of this invention. It is sectional drawing corresponding to CC cross section of FIG. 9 of 2nd Embodiment of this invention. It is the figure which expanded a part of sectional drawing similar to FIG. 3 of 3rd Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the arrow FR indicates the front of the vehicle, and the arrows UP and LF indicate the upper side and the left side of the vehicle, respectively. Further, in each embodiment described below, common portions are denoted by the same reference numerals, and redundant descriptions are omitted.
(Vehicle configuration)
FIG. 1 is a view showing a side surface of a motorcycle 1 on which an engine unit 2 is mounted.
In this motorcycle 1, an engine unit 2 is mounted in the center in the longitudinal direction of the vehicle body, a seat 3 on which an occupant sits is provided above the rear of the engine unit 2, and a fuel tank 4 is provided below the seat 3.
The front wheel Wf is rotatably supported by the front fork 5, and a steering handle 6 is provided on the top of the front fork 5. The rear wheel Wr is swingably supported by the vehicle body frame via the swing arm 7.

(Engine unit)
FIG. 2 is a cross-sectional view of the engine unit 2 corresponding to the AA cross section of FIG.
The engine unit 2 includes a reciprocating engine 10 that is an internal combustion engine and a multistage transmission 11 as an integrated block, and the engine 10 and the transmission 11 can transmit power via a centrifugal clutch 8 and a transmission clutch 12. Has been.

In the engine 10, a piston 14 is slidably fitted in a cylinder bore of a cylinder block 13, and the piston 14 is connected to a crankshaft 16 via a connecting rod 15. As shown in FIG. 1, the engine 10 is mounted on a vehicle in a substantially horizontal posture in which the cylinder block 13 extends forward of the vehicle body with respect to the crankshaft 16. The crankshaft 16 is rotatably supported via a bearing 18 on a crankcase 17 integrally coupled to one end (rear end) of the cylinder block 13. A cylinder head 20 that forms a combustion chamber 19 with the piston 14 is attached to the other end (front end) of the cylinder block 13.
In FIG. 2, 21 is an ignition device installed in the cylinder head 20 so as to face the combustion chamber 19, and 22 is provided at the end of the cylinder head 20 and is not shown in conjunction with the crankshaft 16. This is a valve operating device that opens and closes an intake / exhaust valve. In the figure, reference numeral 23 denotes crank webs provided on both sides in the axial direction of a connecting portion (crank pin) to the connecting rod 15 on the crankshaft 16, and 17a denotes a crankcase that accommodates almost the entire region of the crankshaft 16. 17 is a crank chamber.

A centrifugal clutch 8 is provided on the outer periphery of one end of the crankshaft 16 in the axial direction (the end on the right side of FIG. 2). The centrifugal clutch 8 includes a clutch inner 24 that is integrally fixed to one end portion of the crankshaft 16, a clutch outer 25 that is rotatably supported on the outer periphery on one end side of the crankshaft 16, and a clutch inner 24 that rotates together. And a centrifugal weight 26 that brings the clutch inner 24 and the clutch outer 25 into a connected state by centrifugal force. The centrifugal clutch 8 outputs the rotational power of the crankshaft 16 to the clutch outer 25 when the rotational speed of the crankshaft 16 reaches a predetermined speed or higher.
An output gear 28 that meshes with the input gear 27 of the transmission clutch 12 is coupled to the clutch outer 25 so as to be integrally rotatable.

  A main shaft 29 and a countershaft 30 of the transmission 11 are provided in parallel to the crankshaft 16 at a position behind the rotation center O of the crankshaft 16 in the crankcase 17. The main shaft 29 and the counter shaft 30 are rotatably supported in the crankcase 17 via bearings (not shown), respectively. The main shaft 29 is disposed at a position adjacent to the rear side of the crankshaft 16 in the vehicle, and the countershaft 30 Is disposed at a position adjacent to the main shaft 29 on the vehicle rear side.

A main transmission gear group M1 is disposed on the main shaft 29 of the transmission 11, and a counter gear group M2 that meshes with the main gear group M1 is disposed on the counter shaft 30. The input gear 27 and the transmission clutch 12 that are meshed with the output gear 28 on the crankshaft 16 side are provided at one end of the main shaft 29 in the axial direction. The input gear 27 is rotatably supported on the outer periphery of the main shaft 29. An output sprocket 33 is attached to the other end of the counter shaft 30 in the axial direction. A power transmission chain (not shown) is wound around the output sprocket 33, and the rotation of the countershaft 30 is transmitted to the rear wheel Wr which is a drive wheel through the chain.
In the transmission 11, the drive transmission gears of the main gear group M 1 and the counter gear group M 2 are selected by a turning operation of a shift drum (not shown) provided in the crankcase 17, and thereby any transmission gear stage (gear including neutral) is selected. Position) is set.

  The transmission clutch 12 has a bottomed cylindrical clutch outer 35 rotatably supported on the main shaft 29 in a state of being integrally coupled with the input gear 27, and a substantially disk-like shape that is spline-fitted to the main shaft 29. A clutch inner 36, a plurality of drive friction plates 37 locked to the clutch outer 35 so as to rotate integrally therewith, and a plurality of driven friction plates 38 locked to the clutch inner 36 so as to rotate integrally therewith and in frictional contact with the drive friction plates 37. A clutch spring (not shown) for urging the driving friction plate 37 and the driven friction plate 38 in the press-contact direction, and an operation for releasing the urging force of the clutch spring acting between the driving friction plate 37 and the driven friction plate 38 And an operation plate 40 to be operated.

  The drive friction plate 37 on the clutch outer 35 side and the driven friction plate 38 on the clutch inner 36 side are alternately arranged in the axial direction and are pressed against each other by receiving the urging force of the clutch spring. The power transmission between the clutch outer 35 and the clutch inner 36 is interrupted by allowing the operation plate 40 to release the urging force of the clutch spring.

  The operation plate 40 is moved forward and backward in the axial direction in conjunction with a shift pedal (not shown), and acts between the driving friction plate 37 and the driven friction plate 38 when the driver operates the shift pedal. The urging force of the clutch spring to be released is released, whereby the power transmission between the clutch outer 35 and the clutch inner 36 is cut off.

  A kick spindle 42 of the kick starter 41 is rotatably attached to the lower rear side of the crankcase 17. The kick spindle 42 transmits the rotation to the crankshaft 16 only when the kick pedal 43 is depressed.

  Incidentally, the other end portion of the crankshaft 16 in the axial direction penetrates the side wall (wall portion) of the crankcase 17 and protrudes to the outside of the crankcase 17. On the other end side of the crankshaft 16 protruding from the crankcase 17, a rotating electrical machine (hereinafter referred to as “ACG starter 50”) serving both as an AC generator and a starter motor of the engine 10 is provided. The other end of the crankshaft 16, the front side of the ACG starter 50, and the peripheral area are covered with a bottomed cylindrical engine cover 51 attached to the side wall of the crankcase 17 by bolt fastening or the like.

FIG. 3 is an enlarged view of the installation part of the ACG starter 50 of FIG.
The ACG starter 50 includes a bottomed cylindrical rotor 52 attached to the end of the crankshaft 16, and a stator 53 disposed on the inner peripheral side of the rotor 52. The rotor 52 is fixed to the tip of the crankshaft 16 so that the bottom wall 52a is positioned on the opposite side of the crankcase 17 (on the bottom wall 51a side of the engine cover 51), and the stator 53 is attached to the side wall of the crankcase 17. It is fixed to the protruding boss portion 17b by bolt fastening.

  Permanent magnets 54 are attached to the inner peripheral surface of the rotor 52 so that different magnetic pole surfaces (N-pole surface and S-pole surface) facing the axial center direction of the rotor 52 appear alternately along the circumferential direction. The permanent magnet 54 is disposed on the inner peripheral side of the rotor 52 so that the magnetization direction is basically along the radial direction of the rotor 52. In this embodiment, the permanent magnet 54 is formed by attaching a plurality of strip-shaped magnet pieces to the inner peripheral surface of the rotor 52. The permanent magnet 54 is made of a cylindrical ferromagnetic material with different magnetic pole surfaces along the circumferential direction. It may be magnetized so as to appear alternately.

  The stator 53 has a plurality of teeth 55 projecting in the radial direction, and a coil 56 of any of the U phase, V phase, and W phase is wound around each of the teeth 55. The tip 55a of each tooth 55 faces the magnetic pole surface of the permanent magnet 54 on the inner periphery of the rotor 52 with a small gap. The tip 55a of each tooth 55 constitutes a magnetic pole on the stator 53 side where magnetic flux enters and exits from the permanent magnet 54.

FIG. 4 is an enlarged view of the engine cover 51 portion shown in FIG.
3 and 4, the engine cover 51 includes a bottom wall 51a that covers the outer side of the bottom wall 52a of the rotor 52, and a peripheral wall 51b that covers the outer peripheral area of the rotor 52, and the opening side of the peripheral wall 51b. This end face is abutted against a joint wall 17c projecting from the side wall of the crankcase 17, and is attached to the crankcase 17 by bolt fastening or the like in that state.

  Hall IC units 57 and 57A that detect a change in magnetic flux of the magnetic pole of the stator 53 (the tip 55a of the tooth 55) according to the movement of the permanent magnet 54 are installed on the outer surface of the peripheral wall 51b of the engine cover 51. There are a total of three Hall IC units 57 corresponding to each of the U-phase, V-phase, and W-phase magnetic poles (tips 55a of the teeth 55) of the stator 53. The Hall IC unit 57A includes the stator 53 One of the magnetic poles (tip 55a of teeth 55) is provided. Each Hall IC unit 57, 57A is as shown in FIG. 3 (FIG. 3 shows the Hall IC unit 57, but the Hall IC unit 57A has the same structure), and the Hall IC element 57a is a resin 57b. It is a structure buried inside. Each Hall IC unit 57, 57A is covered with a concave cover member 60 made of metal or resin on the outside of the resin 57b in which the Hall IC element 57a is embedded. It is fixed to the peripheral wall 51b by screws or the like.

  Magnetic flux induction rods 70, 70A made of a magnetic flux induction member having a high magnetic permeability such as iron are attached to each magnetic pole (tip 55a of the tooth 55) whose change in magnetic flux is detected by the Hall IC units 57, 57A. . The magnetic flux guiding rods 70 and 70A are bent at substantially right angles to the rod body portions 70a and 70Aa extending from the distal end portion 55a of the corresponding tooth 55 in the radially outward direction of the stator 53 and the base ends of the rod body portions 70a and 70Aa. Bending locking portions 70b and 70Ab provided in this manner, and the bending locking portions 70b and 70Ab are fitted and fixed to the tip portions 55a of the corresponding teeth 55.

The magnetic flux guide rods 70 and 70Aa attached to the distal end portion 55a of the tooth 55 corresponding to the proximal end side of the rod main body portions 70a and 70Aa straddle the permanent magnet 54 and the axial end surface of the rotor 52 in the non-contact state in the radial direction. In addition, the engine cover 51 extends to the outside of the peripheral wall 51b of the engine cover 51 across the butted portion of the peripheral wall 51b of the engine cover 51 and the joining wall 17c of the crankcase 17. The tip ends of the rod main body portions 70a and 70Aa extending outward from the peripheral wall 51b of the engine cover 51 are opposed to the magnetic flux detection portions of the corresponding Hall IC units 57 and 57A. An insertion groove 61 for pulling out the rod main body portions 70a and 70Aa to the outside of the peripheral wall 51b of the engine cover 51 is provided at the abutting portion between the peripheral wall 51b of the engine cover 51 and the joint wall 17c of the crankcase 17. Further, a resin grommet 62 as a seal member is attached to the rod main body portions 70a and 70Aa, and the space between the rod main body portions 70a and 70Aa and the insertion groove 61 is liquid-tightly sealed by the grommet 62.
Each magnetic flux guide rod 70, 70 </ b> A is attached at one end to the corresponding magnetic pole of the stator 53, and the edge at the other end has a grommet 62 between the peripheral wall 51 b of the engine cover 51 and the joining wall 17 c of the crankcase 17. Is supported through. Further, in this embodiment, the magnetic flux guide rods 70 and 70A extend from the vicinity of the magnetic flux detection part of the Hall IC units 57 and 57A to the vicinity of the corresponding magnetic pole of the stator 53.

The Hall IC units 57 and 57A described above together with the corresponding magnetic flux guide rods 70 and 70A and the permanent magnet 54 on the rotor 52 side constitute a position detection sensor 58 for detecting the rotational position of the rotor 52. Signals detected by the three Hall IC units 57 of the position detection sensor 58 are output to a current control device (not shown) of the ACG starter 50, and each of the coils 56 of U phase, V phase, and W phase is output by the current control device. Is used to control the energization of the current (control the commutation timing). The signal detected by the Hall IC unit 57A of the position detection sensor 58 is output to an engine control device (not shown) as a signal indicating a specific rotational position on the crankshaft 16, and the engine control device uses the engine ignition timing. Used to control etc.
The signal detected by the Hall IC unit 57A is also used for detecting an arbitrary rotation angle other than the engine ignition position on the crankshaft 16 together with the signals detected by the three Hall IC units 57.

5 and 6 are diagrams showing the principle of detecting the rotation of the rotor 52 by the position detection sensor 58. FIG.
Hereinafter, the principle of detecting the rotation of the rotor 52 will be described with reference to FIGS. Here, the three Hall IC units 57 that detect the passage of the permanent magnet 54 with respect to the U-phase, V-phase, and W-phase magnetic poles are referred to as “Hall IC units 57 for energization control” and detect the ignition position of the engine. The Hall IC unit 57A that performs this operation is referred to as “Hall IC unit 57A for detecting the ignition position”. The magnetic flux induction rod 70 corresponding to the Hall IC unit 57 for energization control is referred to as “magnetic flux induction rod 70 for energization control”, and the magnetic flux induction rod 70A corresponding to the Hall IC unit 57A for detecting ignition position is “Ignition”. It will be referred to as a “position detecting magnetic flux guiding rod 70A”.

  As described above, a plurality of strip-shaped permanent magnets 54 are attached to the inner peripheral surface of the rotor 52 so that different magnetic poles (N pole and S pole) are alternately arranged along the circumferential direction. Any one of the permanent magnets 54 is integrally provided with a detection target index magnet 75 (permanent magnet). The indicator magnet 75 is integrally provided in a region on one axial end portion (end portion on the opening end side of the rotor 52) side of an arbitrary magnet piece of the permanent magnet 54, and the rotor central side of the general portion of the permanent magnet 54 is provided. The magnetic poles are different from the magnetic poles facing (for example, N poles if the magnetic poles facing the rotor center side of the general part of the permanent magnet 54 are S poles). In this embodiment, the indicator magnet 75 is magnetized as described above on the same ferromagnetic material as the general part of the permanent magnet 54 as shown in FIG. A separate magnet may be joined to the surface of the portion facing the rotor center side. In the magnet array on one end side in the axial direction including the indicator magnet 75, three same magnetic poles (N poles in the case of the example in FIG. 5) are continuously arranged before and after the indicator magnet 75.

Further, as shown in FIG. 5, the extension length of the bending locking portion 70b of the magnetic flux guiding rod 70 for energization control is set at the other end portion in the axial direction of the permanent magnet 54 (on the bottom wall 52a side of the rotor 52). On the other hand, the extension length of the bending locking portion 70Ab of the magnetic flux guide rod 70A for detecting the ignition position is set to the length up to the region facing the rotation track of the indicator magnet 75. In addition, a magnetic shielding member (not shown) is attached to a region of the bending engagement portion 70b of the magnetic flux guide rod 70 for energization control that faces the rotation trajectory of the indicator magnet 75, thereby removing the rotation trajectory of the indicator magnet 75. The influence of the received magnetic flux can be reduced. The energization control magnetic flux guide rod 70 guides the magnetic flux in the region of the permanent magnet 54 where the index magnet 75 does not exist to the energization control Hall IC unit 57, and the ignition position detection magnetic flux guide rod 70A. Guides the magnetic flux in the region of the permanent magnet 54 where the index magnet 75 exists to the Hall IC unit 57A for detecting the ignition position.
Here, in the magnet row at the end of the rotor 52 including the indicator magnet 75, three same magnetic poles are continuous before and after the indicator magnet 75 as described above, and therefore, the Hall IC unit 57A for detecting the ignition position. Thus, when a change in magnetic flux of three consecutive magnetic poles is detected, a specific position (angle) on the crankshaft 16 can be determined. In this embodiment, the specific position on the crankshaft 16 is made to correspond to the ignition position of the engine.

The rotation angle of the crankshaft 16 can be obtained as follows using the detection signal of the Hall IC unit 57A for detecting the ignition position and the detection signal of the Hall IC unit 57 for each energization control.
That is, in the Hall IC unit 57A for detecting the ignition position, a specific angle on the crankshaft 16 with respect to the engine cover 51 can be detected. Therefore, after the detection signal is output from the Hall IC unit 57A for detecting the ignition position. By counting the number of detection signal pulses from the Hall IC unit 57 for controlling each energization, a plurality of angles starting from specific angles on the crankshaft 16 can be detected.

  As described above, in the engine unit 2 of this embodiment, the Hall IC units 57 and 57A of the position detection sensor 58 are installed on the outer surface of the peripheral wall 51b of the engine cover 51, and the permanent magnets 54 of the magnetic poles of the stator 53 are arranged. Since the change of the magnetic flux accompanying the rotation is detected by each Hall IC unit 57, 57A through the magnetic flux guide rods 70, 70A, the inside of the engine cover 51 is likely to become hot due to high heat on the crankcase 17 side. Even in the environment, the Hall IC units 57 and 57A can be maintained at room temperature. In the case of the engine unit 2 of this embodiment, since the Hall IC units 57 and 57A are arranged in a wide space outside the peripheral wall 51b of the engine cover 51, the shape and size of the Hall IC units 57 and 57A are the same. As the degree of freedom increases, the degree of freedom of component placement in the engine cover 51 increases.

Further, in the engine unit 2 of this embodiment, the magnetic flux guide rods 70 and 70A are disposed across the butted portion of the peripheral wall 51b of the engine cover 51 and the joint wall 17c of the crankcase 17, and the magnetic flux guide rods 70 and 70A Since the gap between the butted portions is sealed by the grommet 62, even when the lubricating oil flows from the crank chamber 17 a into the engine cover 51, the lubricating oil leaks to the outside through the lead-out portion of the magnetic flux guide rod 70. It can be blocked by 62.
Further, when the engine unit 2 is assembled, the grommet 62 is attached to the rod main body portions 70a and 70Aa of the magnetic flux guiding rods 70 and 70A, and the grommet 62 is engaged with the insertion groove 61 in this state, and the engine cover 51 is attached to the crankcase 17. The grommet 62 and the magnetic flux guiding rods 70 and 70A can be easily attached between the butted portions simply by fastening and fixing to the butt.

In the case of this embodiment, the Hall IC units 57 and 57A are covered with the cover member 60, and the cover member 60 is attached to the outer surface of the engine cover 51 by screws or the like. And can be attached to the engine cover 51 stably.
The cover member 60 may be attached to the crankcase 17 side, or may be attached across both the crankcase 17 and the engine cover 51. Further, a seal member for preventing water and dust from entering may be provided between the cover member 60 and the crankcase 17 or the engine cover 51.

  In the engine unit 2 of this embodiment, a magnetic flux guide rod 70 is attached to each of the U-phase, V-phase, and W-phase magnetic poles of the stator 53, and the magnetic flux generated by the permanent magnet 54 of the rotor 52 is passed through each magnetic flux guide rod 70. Can be detected by the corresponding Hall IC unit 57, so that the timing at which the permanent magnet 54 on the rotor 52 side passes in the vicinity of each magnetic pole of the U phase, V phase, and W phase can be accurately detected. it can.

  Furthermore, in the engine unit 2 of this embodiment, the base end portions of the magnetic flux guide rods 70 and 70A are attached to the corresponding magnetic poles of the stator 53, while the vicinity of the tip portions of the magnetic flux guide rods 70 and 70A is the engine cover 51. Since the structure is sandwiched between the butted portions of the crankcase 17, the magnetic flux guide rods 70 and 70 </ b> A are easily and stably supported by the magnetic poles of the stator 53 and the joint portion of the engine cover 51. Can do.

FIG. 7 is an enlarged view showing an installation portion of the ACG starter 50 according to the second embodiment of the present invention. FIG. 8 is an enlarged view of the engine cover 51 portion according to the second embodiment of the present invention. FIG. 9 and 10 are diagrams for explaining the structure of the position detection sensor 158 of the second embodiment.
The basic configuration of the engine unit of this embodiment is substantially the same as that of the first embodiment. However, in the first embodiment, the base end portions of the magnetic flux guiding rods 70 and 70A are directly attached to the magnetic poles of the stator 53. In addition, the vicinity of the tip of the magnetic flux guide rods 70 and 70A is sandwiched between the butted portions of the engine cover 51 and the crankcase 17, whereas the engine cover straddles the butted portions of the engine cover 51 and the crankcase 17. An arm member 90 extending to the outside of 51 is integrally attached to the stator 53, and each U-phase, V-phase, and W-phase magnetic flux induction plate 170 (magnetic flux induction member) and ignition position detection are attached to the arm member 90. A magnetic flux induction plate 170A (magnetic flux induction member) is attached.

  The arm member 90 is a substantially fan-shaped member made of a resin material in plan view, and the root side corresponding to the inside of the fan is integrally fixed to the inner peripheral edge of the stator 53 by screws or the like. The arm member 90 has a boss portion together with the stator 53 in a state where the base portion side is sandwiched between a notch portion 92 formed in the boss portion 17 b on the crankcase 17 side and the inner peripheral edge portion of the stator 53. It is fixed to 17b. A concave-shaped portion 93 whose opening side faces the outer surface of the peripheral wall 51 b of the engine cover 51 is integrally formed at an end portion of the arm member 90 on the side extending outward in the radial direction of the stator 53. The concave shape portion 93 is provided so as to protrude upward from the end portion of the arm member 90. Three magnetic flux induction plates 170 for U-phase, V-phase, and W-phase, and an ignition position, from the upper surface of the region extending radially outward of the stator 53 of the arm member 90 to the inner surface of the bottom wall of the concave portion 93 170 A of magnetic flux induction plates for a detection are attached radially centering on the rotor center.

  Further, bent portions 170 a and 170 Aa are provided on the front end sides of the respective magnetic flux induction plates 170 and 170 A attached to the arm member 90 so as to be along the inner surface of the bottom wall of the concave portion 93 of the arm member 90. The U-phase, V-phase, and W-phase Hall IC units 57 and the ignition position detection Hall IC unit 57A are attached to the inner wall of the concave portion 93 of the arm member 90. In each Hall IC unit 57 for U-phase, V-phase, and W-phase, the respective magnetic flux detection portions face the bent portions 170a of the U-phase, V-phase, and W-phase magnetic flux induction plates 170, In the Hall IC unit 57A for detecting the ignition position, the magnetic flux detection part faces the bent part 170Aa of the magnetic flux induction plate 170A for detecting the ignition position. The Hall IC units 57 and 57A are held by a cylindrical cover member 60, and the cover member 60 is integrated with the concave portion 93 of the arm member 90 by screwing, welding, integral molding or the like. In this embodiment, the Hall IC unit 57 for U phase, V phase, and W phase and the Hall IC unit 57A for detecting the ignition position are attached to the arm member 90 together with the magnetic flux induction plates 170 and 170A in advance. Therefore, the positional accuracy of the Hall IC units 57 and 57A and the magnetic flux induction plates 170 and 170A can be improved, and the assembling workability can also be improved.

The arm member 90 and the magnetic flux induction plates 170 and 170A attached to the arm member 90 straddle the butted portion of the peripheral wall 51b of the engine cover 51 and the joining wall 17c of the crankcase 17, and the diameter of the engine cover 51. It extends outward in the direction. An insertion groove 94 is formed in the peripheral wall 51 b of the engine cover 51 and the joint wall 17 c of the crankcase 17, and a grommet 95 as a seal member is formed between the insertion groove 94 and the arm member 90 and the magnetic flux guide plate 170. It is intervened. Further, a flange portion 93a is integrally provided in the concave shape portion 93 on the distal end side of the arm member 90, and the flange portion 93a is provided on at least one of the peripheral wall 51b of the engine cover 51 and the joining wall 17c of the crankcase 17. It is fixed by screwing or the like. In addition, it is desirable to interpose a seal member between the concave shape portion 93 of the arm member 90 and the peripheral wall 51b of the engine cover 51 and the joint wall 17c of the crankcase 17.
In this embodiment, the concave portion 93 of the arm member 90 constitutes a cover member that covers the Hall IC units 157 and 157A.

By the way, each permanent magnet 154 of this embodiment is formed in an arc shape along the inner peripheral surface of the rotor 52 as shown in FIG. 9, and reciprocal magnetic poles (N pole and It is magnetized so that the S pole) appears. The plurality of permanent magnets 154 attached to the inner peripheral surface of the rotor 52 have different magnetic poles in the circumferential direction on the surface facing the axial center of the rotor 52 and the surface on the end side in the axial direction of the rotor 52. It appears to alternate along.
As shown in FIGS. 9 and 10, an arbitrary target permanent magnet 154 of the plurality of permanent magnets 154 is integrally provided with an indicator magnet 75 (permanent magnet) for detection target. The indicator magnet 75 is integrally provided in a region of a part in the axial direction of the substantially half of the permanent magnet 154 in the arc direction (outer portion in the rotor radial direction), and is a magnetic pole facing the rotor center side of the general part of the permanent magnet 154. (For example, if the magnetic pole facing the rotor center side of the general part of the permanent magnet 54 is an S pole, it is magnetized). In this embodiment, the indicator magnet 75 is magnetized as described above on the same ferromagnetic material as the general part of the permanent magnet 154 as shown in FIG. A separate magnet may be joined to a part of the side surface. In the magnet array in the outer region in the rotor radial direction including the index magnet 75, three same magnetic poles (N poles in the case of the example of FIG. 9) are continuously arranged before and after the index magnet 75.

  Further, the end edges 170b and 170Ab on the opposite side to the bent portions 170a and 170Aa of the magnetic flux induction plates 170 and 170A are bent in a crank shape so as to be close to the surface on the end side in the axial direction of the rotor 52 of the permanent magnet 154. doing. The extension lengths of the end edges 170b of the three magnetic flux induction plates 170 for U phase, V phase, and W phase are long over the entire thickness direction of the permanent magnet 154 (the direction along the radial direction of the rotor 52). The extension length of the edge 170Ab of the ignition position detection magnetic flux guide plate 170A is a length that extends over only a part of the permanent magnet 154 in the thickness direction so as to face the movement track of the indicator magnet 75. Is set. The U-phase, V-phase, and W-phase magnetic flux induction plates 170 and the end edges 170b and 170Ab of the ignition position detection magnetic flux induction plate 170A are directed to the corresponding magnetic poles on the stator 53. . Therefore, in the case of this embodiment, although each magnetic flux induction plate 170 is not directly attached to the corresponding magnetic pole, the magnetic flux of the corresponding magnetic pole can be reliably guided to the Hall IC unit 57 outside the engine cover 51. .

  Also in this embodiment, in the magnet array at the end including the index magnet 75, three same magnetic poles are continuous before and after the index magnet 75 as described above, so that the Hall IC unit 57A for detecting the ignition position is used. Thus, when a change in magnetic flux of three consecutive magnetic poles is detected, a specific position on the crankshaft 16 can be determined.

The engine unit of this embodiment can basically obtain substantially the same effect as that of the first embodiment.
However, in this embodiment, a resin arm member 90 extending to the outside of the engine cover 51 across the butted portion of the engine cover 51 and the crankcase 17 is integrally attached to the stator 53, and the magnetic flux is transferred to the Hall IC unit 57. , 57A are guided to the arm member 90, so that the flux guiding plates 170, 170A can be stably attached to the engine cover 51 and the crankcase 17 together with the stator 53.

  In the case of this embodiment, the magnetic flux induction plates 170 and 170A can be attached to the arm member 90 in advance, and the arm member 90 can be attached to the stator 53 integrally. There is an advantage that the magnetic flux induction plates 170 and 170A can be easily assembled.

FIG. 11 is a diagram showing a third embodiment of the present invention. Hereinafter, the third embodiment will be described. Since the basic configuration of the third embodiment is substantially the same as that of the second embodiment, the common parts refer to the drawings showing the second embodiment as appropriate. And
The basic structure of the third embodiment is almost the same as that of the second embodiment, but the end of the arm member 90 that supports the magnetic flux induction plates 170 and 170A on the side that is pulled out to the outside of the engine cover 51. Is different from that of the second embodiment. That is, in the second embodiment, the concave portion 93 that covers the outside of the Hall IC units 157 and 157A is formed at the end of the arm member 90. However, in the third embodiment, the concave portion 93 is formed. Instead, a bent wall 93A that is simply bent at a substantially right angle is provided. The bent portions 170a and 170Aa of the magnetic flux induction plates 170 and 170A are attached to the bent wall 93A.
In the case of the third embodiment, the Hall IC units 157 and 157A and a separate cover member 65 that covers the outer region of the bent wall 93A of the arm member 90 are provided, and the cover member 65 serves as the engine cover 51. Are attached to at least one of the peripheral wall 51b and the joint wall 17c of the crankcase 17 by screws or the like. It is desirable that a seal member be interposed between the cover member 65, the engine cover 51, and the crankcase 17.

  Although the third embodiment can obtain substantially the same effect as the second embodiment, the shape of the end portion of the arm member 90 can be simplified, so that the arm member 90 can be easily formed. There are advantages.

In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary.
For example, in each of the embodiments described above, the magnetic flux guide rod 70 and the magnetic flux guide plate 170 straddle the mating surfaces of the engine cover 51 and the crankcase 17, but through holes are provided in the engine cover 51 and the crankcase 17. The magnetic flux guide rod 70 and the magnetic flux guide plate 170 may be pulled out through the hole. Also in this case, it is desirable to insert a grommet as a seal member in the through hole.

2 ... Engine unit 16 ... Crankshaft 17 ... Crankcase 50 ... ACG starter (rotary electric machine)
DESCRIPTION OF SYMBOLS 51 ... Engine cover 52 ... Rotor 53 ... Stator 54,154 ... Permanent magnet 55a ... Tip part (magnetic pole)
57, 57A ... Hall IC unit 58 ... Position detection sensor 60 ... Cover member 62, 95 ... Grommet (seal member)
65 ... Cover member 70, 70A ... Magnetic flux guide rod (Flux guide member)
90 ... arm member 93 ... concave part (cover member)
170, 170A ... Magnetic flux induction plate (magnetic flux induction member)

Claims (6)

A rotating electrical machine (50) having a rotor (52) attached to an end of the crankshaft (16) and a stator (53) attached to a non-rotating part adjacent to the rotor (52);
A position detection sensor (58) for detecting the rotational position of the rotor (52);
A crankcase (17) for rotatably supporting the crankshaft (16);
An engine cover (51) attached to the crankcase (17) and covering an end of the crankshaft (16) and the outside of the rotating electrical machine (50);
The position detection sensor (58) detects a change in magnetic flux according to the rotational position of the permanent magnet (54) provided on the rotor (52) and the permanent magnet (54) on the rotor (52). In an engine unit sensor installation structure configured to include an IC unit (57),
The Hall IC unit (57) is installed outside the engine cover (51),
The vicinity of the magnetic pole (55a) of the stator (53) that receives the magnetic force of the permanent magnet (54) on the rotor (52) from the vicinity of the magnetic flux detection part of the Hall IC unit (57), or the permanent A sensor installation structure for an engine unit, characterized in that a magnetic flux guiding member (70) having a high magnetic permeability extending in the vicinity of the passing track of the magnet (54) is provided. The magnetic flux guide member (70) is disposed across the butted portion of the engine cover (51) and the crankcase (17),
The engine unit sensor installation structure according to claim 1, wherein a seal member (62) is interposed between the magnetic flux guide member (70) and the abutting portion.   The Hall IC unit (57) is covered with a cover member (60), and the cover member (60) is attached to at least one of the engine cover (51) and the crankcase (17). The sensor installation structure of the engine unit according to claim 1 or 2. The permanent magnet (54) provided in the rotor (52) is magnetized so that different magnetic pole faces appear alternately along the circumferential direction of the rotor (52), and functions as a rotating electrical machine. (53) is a permanent magnet in which magnetic flux enters and exits between the U-phase, V-phase, and W-phase magnetic poles.
The said magnetic flux induction member (70) is each provided corresponding to the magnetic flux in-and-out position of each magnetic pole (55a) of the said U-phase, V-phase, and W-phase. 2. A sensor installation structure for an engine unit according to item 1.   One end of the magnetic flux guiding member (70) is attached to the magnetic pole (55a) of the stator (53), and the vicinity of the other end is sandwiched between the engine cover (51) and the crankcase (17). The engine unit sensor installation structure according to any one of claims 1 to 4, wherein the sensor unit structure is supported by the engine unit. An arm member (90) extending to the outside of the engine cover (51) across the butted portion of the engine cover (51) and the crankcase (17) is integrally attached to the stator (53),
The sensor installation structure for an engine unit according to any one of claims 1 to 4, wherein the magnetic flux guiding member (170) is attached along the arm member (90).

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