JP2001339925A - Outer-rotor motor generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and exactly mount a magnet of a rotor to a crank pulley in an outer-rotor motor generator housed in the crank pulley of an engine. SOLUTION: A plurality of magnets 34 constituting a rotor of the outer-rotor motor generator is covered with resin P1 to P4 and fixed at the internal surface of a peripheral wall 33 of the crank pulley 9. A pulley groove 42 molded with resin at the external surface of the peripheral wall 33 of the crank pulley 9 is connected to the resin P4 that fills a gap between magnets 34 adjoining each other with the resin P5 that fills a hole 33a that pierces the peripheral wall 33. A cooling fan 43 that forcibly ventilates the interior of the crank pulley 9 housing the motor generator is molded with resin to a sidewall 32 of the crank pulley 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator housed in an annular space defined between a crank pulley fixed to the shaft end of a crankshaft and an engine side wall and supported on the engine side wall, and an outer periphery of the stator. The present invention relates to an outer rotor type motor / generator including a magnet supported on an inner surface of a peripheral wall of a crank pulley so as to face the same.

[0002]

2. Description of the Related Art Generally, a starter motor for an automobile is mounted outside an engine block. However, if the starter motor is housed in an internal space of a crank pulley provided on a crankshaft, the entire engine can be downsized. Moreover, by making the starter motor function as a generator when the engine brake is activated, regenerative braking can be performed and kinetic energy of the vehicle body can be recovered as electric energy. Such an outer rotor type motor / generator is disclosed by the present applicant in Japanese Patent Application No.
190231.

[0003]

However, in such an outer rotor type motor / generator, an adhesive or a bolt is generally used as a means for fixing a magnet to the inner surface of the peripheral wall of the crank pulley. However, the method using an adhesive not only increases the working time, but also may cause the magnet to fall off due to the inevitable variation in adhesive strength, and the method using bolts increases the number of parts and assembly steps. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an outer rotor type motor / generator housed inside a crank pulley of an engine, in which a magnet of a rotor is easily and securely attached to the crank pulley. And

[0005]

To achieve the above object, according to the first aspect of the present invention, an annular section defined between a crank pulley fixed to a shaft end of a crankshaft and an engine side wall. An outer rotor type motor / generator comprising a stator housed in a space and supported on an engine side wall, and a magnet supported on an inner surface of a peripheral wall portion of a crank pulley so as to face an outer periphery of the stator. An outer rotor type motor / generator characterized by being integrally fixed to the inner surface of a peripheral wall of a crank pulley by resin molded on the inner surface of the peripheral wall is proposed.

According to the above configuration, when the crankshaft rotates, the rotor supported by the crank pulley and the stator supported by the engine side wall rotate relative to each other, and the function as a motor or a generator is exhibited. Since the magnet is integrally fixed to the inner surface of the peripheral wall of the crank pulley with the resin molded on the inner surface of the peripheral wall, the magnet can be easily and reliably fixed to the crank pulley without using an adhesive or a bolt.

According to the second aspect of the present invention,
In addition to the configuration of claim 1, a pulley groove is molded with resin on the outer surface of the peripheral wall portion of the crank pulley, and a hole penetrating the resin filling the space between adjacent magnets and the resin forming the pulley groove through the peripheral wall portion. An outer rotor type motor / generator characterized in that they are connected via a.

According to the above construction, the magnet is fixed to the inner surface of the peripheral wall of the crank pulley with resin, and the pulley groove is molded to the outer surface of the peripheral wall of the crank pulley with resin, so that the magnet is fixed and the pulley groove is formed. At the same time, the machining cost can be reduced as compared with the case of cutting the pulley groove. In addition, the resin that fills the space between adjacent magnets and the resin that forms the pulley groove are connected through a hole that penetrates the peripheral wall of the crank pulley, so the resin part is firmly fixed to the peripheral wall of the crank pulley to increase strength. Can be enhanced.

According to the third aspect of the present invention,
In addition to the configuration according to claim 2, an outer rotor type motor / generator is proposed, wherein the space filled with resin sandwiched between adjacent magnets increases in width from the outside to the inside in the radial direction. Is done.

According to the above construction, the space filled with the resin sandwiched between the adjacent magnets increases in width from the outside in the radial direction to the inside, so that the magnet comes off the inner surface of the peripheral wall of the crank pulley. Can be reliably prevented.

According to the invention described in claim 4,
In addition to the configuration according to any one of claims 1 to 3, the inside of the annular space is forcibly ventilated to the side wall portion of the crank pulley extending radially outward from the shaft end of the crankshaft and connected to the peripheral wall portion of the crank pulley. An outer rotor type motor / generator characterized by integrally molding a cooling fan with resin is proposed.

According to the above configuration, since the inside of the annular space is forcibly ventilated by the cooling fan provided on the side wall of the crank pulley, the stator which has generated heat during operation can be effectively cooled. Moreover, since the cooling fan is integrally molded with the resin on the side wall of the crank pulley, the cooling fan can be formed simultaneously with fixing the magnet and forming the pulley groove, thereby reducing processing time and processing cost. .

According to the invention described in claim 5,
The outer rotor type motor according to any one of claims 1 to 4, wherein a resin for integrally molding the magnet on the inner surface of the peripheral wall of the crank pulley covers a surface of the magnet facing the stator. -A generator is proposed.

According to the above construction, the surface of the magnet facing the stator is covered with the resin for fixing the magnet to the crank pulley. Damage to the magnet due to collision with foreign matter that has entered the air gap can be prevented.

The chain cover 26 in the embodiment corresponds to the engine side wall of the present invention.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 7 show one embodiment of the present invention. FIG. 1 is a view of an in-line multi-cylinder engine in an axial direction of a crankshaft. FIG. 2 is an enlarged sectional view of a main part of FIG. 3 is a sectional view taken along line 3-3 of FIG. 2, FIG. 4 is a sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 7 is a sectional view taken along line 7-7 of FIG.

As shown in FIG. 1, an accessory component mounting bracket 2 is fixed to a side surface of an engine block 1 of an in-line multi-cylinder engine E mounted on a vehicle. The oil pump 3, the auto tensioner 4, the alternator 5, the engine cooling water pump 6, and the air conditioning compressor 7 are fixed. A crank pulley 9 provided at a shaft end of a crankshaft 8 of the engine E (a shaft end opposite to the transmission); an oil pump pulley 10 provided at the oil pump 3; a tensioner pulley 11 provided at the auto tensioner 4; 5, a single endless belt 15 is wound around an alternator pulley 12 provided on the water pump 6, a water pump pulley 13 provided on the water pump 6, and a compressor pulley 14 provided on the compressor 7. Is transmitted to the oil pump 3, the alternator 5, the water pump 6 and the compressor 7 by the endless belt 15, and the tension is applied to the endless belt 15 by the auto tensioner 4.

The tensioner pulley 11 and the water pump pulley 13 are driven by the back surface of the endless belt 15. By using the single endless belt 15 and utilizing the back surface, the accessory parts 3 to 7 are used. Not only can be arranged compactly with each other close to each other, but also the endless belt 1 for each pulley 10-14.
Auxiliary parts 3 to 7 can be reliably driven by ensuring a sufficient winding angle of 5.

As is apparent from FIGS. 2 and 3, a camshaft driving sprocket 21 and a balancer shaft driving sprocket 22, which are integrally formed, are fixed to the crankshaft 8 projecting from the engine block 1. An endless chain 23 wound around the camshaft drive sprocket 21 and an endless chain 24 wound around the balancer shaft drive sprocket 22 are covered with a chain cover 26 joined to the engine block 1 with bolts 25. The chain cover 26 constitutes the engine side wall of the present invention.

A boss 28 of the crank pulley 9 is fitted to a shaft end of the crankshaft 8 projecting from the chain cover 26 via a seal member 27 via a key 29, and is prevented from coming off by a bolt 30 and a washer 31. . Side wall portion 3 extending radially from boss portion 28 of crank pulley 9
An annular peripheral wall portion 33 is formed integrally with the outer end of 2 and
A pulley groove 42 with which the endless belt 15 is engaged is formed of resin on the outer peripheral surface of the peripheral wall portion 33. Inside the crank pulley 9, an annular space S surrounded by the boss portion 28, the side wall portion 32, the peripheral wall portion 33, and the chain cover 26 is formed, and the motor generator M is housed in the annular space S.

The motor / generator M includes a plurality of magnets 34 fixed along the inner peripheral surface of the peripheral wall portion 33 of the crank pulley 9 by resin molding. Is configured. The outer surface of the chain cover 26 includes a plurality of cores 35 radially arranged around the crankshaft 8 and a plurality of coils 37 wound around the cores 35 via bobbins 36. The stator 39 is fixed with a plurality of bolts 38. The outer peripheral surface of the core 35 is a small air gap g (see FIG. 3).
Are opposed to the inner peripheral surfaces of the magnets 34.

4 to 6, the both ends of the magnets 34 in the axial direction are made of resins P1 and P2.
2 are covered with an inner peripheral surface of the magnet 34.
.. Are filled with the resin P4. A hole 33a is formed in the peripheral wall portion 33 of the crank pulley 9 corresponding to a space between the adjacent magnets 34.
Magnets 34 adjacent by resin P5 filling ...
The resin P4 filling the space and the pulley groove 42 made of resin are integrally connected. Further, the opposing wall surfaces of the adjacent magnets 34 are widened at an angle θ inward in the radial direction (see FIG. 4).

As described above, the entire magnets 34 are fixed to the inner surface of the peripheral wall portion 33 of the crank pulley 9 by covering the entire magnets 34 with the resins P1 to P4, so that the magnets 34 are firmly fixed without using an adhesive or a bolt. be able to. In particular, the opposing wall surfaces of the adjacent magnets 34 are widened at an angle θ inward in the radial direction.
Are reliably prevented from falling inward in the radial direction. Further, since the inner peripheral surface of the magnets 34 is covered with the film-like resin P3, even if foreign matter sucked into the annular space S enters the gap g between the magnets 34 and the cores 35, the foreign matter is not removed. Damage to the magnets 34 can be effectively prevented. In addition, the resin P5 filling the holes 33a of the peripheral wall 33 of the crank pulley 9 integrally connects the resin P4 filling the space between the adjacent magnets 34 and the pulley groove 42 made of resin.
The resin portion on the outside and the resin portion on the inside of the peripheral wall portion 33 can be integrated to greatly increase the strength.

A plurality of (18 in this embodiment) resin cooling fans 43 are radially formed on the side wall 32 of the crank pulley 9, and these cooling fans 43 rotate with the crankshaft 8. The side wall portion 32 of the crank pulley 9 extends radially to form the peripheral wall portion 32 and the boss portion 2.
8 are connected to each other, and cooling fans 43 (see FIG. 7) having a triangular cross section are molded with resin so as to surround three sides of each blade core 32a.

As described above, the resin molding of the pulley groove 42, the molding of the cooling fans 43, and the fixing of the magnets 34 are performed by fixing the metal portion of the crank pulley 9 and the magnets 34 in the mold and injecting the resin. The processing time and the processing cost can be greatly reduced because the processing is completed only by performing the operation.

As shown in FIG. 3, a rotation speed sensor 40 fixed to the chain cover 26 faces a detection dog 41 protruding from the outer peripheral surface of the boss 28 of the crank pulley 9.
The rotation speed of the crankshaft 8 is detected based on a pulse signal output by the rotation speed sensor 40 when the detection dog 41 passes in front of the rotation speed sensor 39.

An annular air introduction passage 44 is formed between the end of the peripheral wall 33 of the crank pulley 9 and the chain cover 26 to communicate the external space of the crank pulley 9 with the annular space S. Therefore, the inlet of the air gap g faces the air introduction passage 44 and the outlet of the air gap g faces the cooling fans 43.

If the coils 37 of the motor / generator M are demagnetized, the crank pulley 9 simply functions as a simple pulley. By applying a suction force and a repulsive force to the crankshaft 8, the crank pulley 9 is rotationally driven to crank the crankshaft 8, and the stopped engine E can be started. When the crankshaft 8 is rotated by the driving force transmitted from the driving wheels to the engine E during braking of the vehicle, the motor generator M functions as a generator to generate a regenerative braking force.

As described above, since the motor generator M for starting the engine E is housed in the crank pulley 9, the engine E and the transmission due to the mounting of the motor generator M are minimized, and the engine room is minimized. It can be easily mounted on a vehicle. In addition, since the motor generator M is housed in the annular space S formed inside the crank pulley 9, it is possible to protect the motor generator M from dirt and damage due to suction of foreign matter.

When the coils 37 generate heat by the operation of the motor generator M, the coils 37 are cooled by air introduced into the crank pulley 9. That is, when the crank pulley 9 rotates together with the crankshaft 8, the cooling fan 43 formed on the side wall 32 of the crank pulley 9.
Rotate, and air outside the crank pulley 9 is introduced into the annular space S via the air introduction passage 44. The air introduced into the annular space S cools the coils 37 while passing through the gap formed between the adjacent coils 37 and is discharged to the outside of the crank pulley 9 by the cooling fans 43.

As described above, since the inside of the crank pulley 9 is forcibly ventilated by the cooling fans 43 rotating together with the crankshaft 8, the heated coils 37 are effectively cooled to prevent a decrease in durability. be able to.

While the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

[0034]

As described above, according to the first aspect of the present invention, since the magnet is integrally fixed to the inner surface of the peripheral wall of the crank pulley by using resin molded on the inner surface of the peripheral wall, the adhesive and the bolt can be removed. The magnet can be easily and reliably fixed to the crank pulley without using it.

According to the second aspect of the present invention,
Since the magnet is fixed to the inner surface of the peripheral wall of the crank pulley with resin and the pulley groove is molded with resin on the outer surface of the peripheral wall of the crank pulley, the magnet can be fixed and the pulley groove can be formed at the same time. The machining cost can be reduced as compared with the case of cutting the steel. In addition, the resin that fills the space between adjacent magnets and the resin that forms the pulley groove are connected through a hole that penetrates the peripheral wall of the crank pulley, so the resin part is firmly fixed to the peripheral wall of the crank pulley to increase strength. Can be enhanced.

According to the third aspect of the present invention,
Since the space filled with the resin between the adjacent magnets increases in width from the outside in the radial direction to the inside, it is possible to reliably prevent the magnets from coming off the inner surface of the peripheral wall of the crank pulley.

According to the fourth aspect of the present invention,
Since the inside of the annular space is forcibly ventilated by the cooling fan provided on the side wall of the crank pulley, the stator that has generated heat during operation can be effectively cooled. Moreover, since the cooling fan is integrally molded with the resin on the side wall of the crank pulley, the cooling fan can be formed simultaneously with fixing the magnet and forming the pulley groove, thereby reducing processing time and processing cost. .

According to the invention described in claim 5,
Since the surface of the magnet facing the stator is covered with the resin that fixes the magnet to the crank pulley, the entire magnet is covered with the resin to increase the mounting strength and collide with foreign matter that has entered the air gap between the magnet and the stator. This can prevent damage to the magnet.

[Brief description of the drawings]

FIG. 1 is a diagram of an in-line multi-cylinder engine viewed in an axial direction of a crankshaft.

FIG. 2 is an enlarged sectional view of a main part of FIG. 1;

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 4;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 6;

[Explanation of symbols]

 P1 resin P2 resin P3 resin P4 resin S Annular space 8 Crankshaft 9 Crank pulley 26 Chain cover (engine side wall) 32 Side wall part 33 Peripheral wall part 33a Hole 34 Magnet 39 Stator 42 Pulley groove 43 Cooling fan

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 7/18 H02K 7/18 B 9/06 9/06 CF term (Reference) 5H002 AA08 AB06 AC03 AC07 AD04 AD05 5H605 AA01 AA08 BB05 BB19 CC01 CC02 CC08 CC10 DD11 GG18 5H607 AA11 AA12 BB01 BB14 BB17 CC01 DD02 DD08 DD09 DD17 EE28 FF02 5H609 BB03 BB15 QQ02 QQ11 RR05 RR27 RR42 RR43 5H621 GA01

Claims (5)

[Claims] An engine is housed in an annular space (S) defined between a crank pulley (9) fixed to the shaft end of a crankshaft (8) and an engine side wall (26) and supported by the engine side wall (26). And the crank pulley (9) facing the outer periphery of the stator (39).
Magnet (34) supported on the inner surface of the peripheral wall (33)
And a resin (P1 to P4) obtained by molding the magnet (34) on the inner surface of the peripheral wall portion (33) of the crank pulley (9) on the inner surface of the outer peripheral wall portion (33). An outer rotor type motor / generator fixed integrally. 2. A peripheral wall (33) of a crank pulley (9).
A pulley groove (42) is molded on the outer surface with a resin, and a resin (P4) filling the space between the adjacent magnets (34) and a resin forming the pulley groove (42) are mixed with the peripheral wall portion (3).
3. The outer rotor type motor according to claim 1, wherein the outer rotor type motor is connected via a hole (33a) penetrating through the outer rotor type motor.
generator. 3. The space filled with the resin (P4) sandwiched between adjacent magnets (34) has a width increasing from the outside to the inside in the radial direction. Outer rotor type motor generator. 4. A peripheral wall (3) of a crank pulley (9) extending radially outward from an axial end of a crankshaft (8).
Side wall portion (32) of crank pulley (9) connected to 3)
The outer rotor type motor according to any one of claims 1 to 3, wherein a cooling fan (43) for forcibly ventilating the inside of the annular space (S) is integrally molded with resin. generator. 5. The resin (P1 to P4) for integrally molding the magnet (34) on the inner surface of the peripheral wall portion (33) of the crank pulley (9) has a surface facing the stator (39) of the magnet (34). The outer rotor type motor according to any one of claims 1 to 4, wherein the outer rotor type motor is coated.
generator.