JP2001251800A - Magnetic shield structure for vehicle motor-assist device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise in the detected signal of a rotation position sensor by eliminating adverse effects on a rotation position sensor due to magnetic flux and wave noise leaking from a motor stator. SOLUTION: This vehicle motor-assist device 4 is provided with a generator directly connected with an engine, a rotation position sensor 80 formed of a sensor stator 98 disposed so as to cope with a sensor rotor 96 for detecting the rotation position of a motor rotor 82, a motor stator and a sensor stator mounted respectively on a motor case 34 mounted on a cylinder block, and a motor rotor and a sensor rotor mounted respectively on a rotor-mounting member 36 mounted on a crank shaft. A magnetic shield 136, shielding magnetic flux and/or wave noise leaking from the motor stator, is disposed between the motor rotor 82 and/or the motor stator of the generator and the sensor stator of the rotational position sensor and a signal line connected to the sensor stator 98.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic shield structure of a motor assist device for a vehicle, and more particularly to a motor position assist device for a motor generator of a generator motor, which can eliminate adverse effects on a rotational position sensor due to magnetic flux or radio noise leaked from the motor stator. The present invention relates to a magnetic shield structure of a vehicle motor assist device that can reduce generation of noise in a detection signal of a sensor.

[0002]

2. Description of the Related Art In a vehicle, a power generator (motor) is directly connected to an engine driven by combustion of fuel as a power source.
There is a so-called hybrid vehicle provided with a vehicle motor assist device that assists the driving force of an engine with the driving force of a generator.

[0003] A motor assist device for a vehicle is provided with a power generator having a power generation function driven by electric energy, and a rotational position sensor for detecting a rotational position of the power generator. The motor assist device for a vehicle controls the operation state of the engine and the power generator in association with the control means to achieve the required performance (fuel consumption, exhaust harmful component value, power performance, etc.) at a high level.

As such a motor assist device for a vehicle, Japanese Patent Application Laid-Open No. H11-78556 and Japanese Patent Application Laid-Open No. H11-7
There is one disclosed in Japanese Patent No. 8558. JP-A-11-
Japanese Patent No. 78556 discloses a device provided with a blocking member for preventing metal powder generated by a clutch mechanism from entering a motor generator. JP-A-11-7
Japanese Unexamined Patent Publication No. 8558 discloses a configuration in which a shielding member that shields current and magnetic flux from a motor generator is provided between an engine and a motor generator.

[0005]

However, the motor assist device for a vehicle has a problem that magnetic flux and radio noise leak from the motor stator during the driving operation or the power generation operation of the generator, which adversely affects peripheral devices. .

Therefore, in the motor assist device for a vehicle disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 11-78558,
By providing a shielding member between the engine and the motor generator, it is possible to prevent a leakage current or a leakage magnetic flux from a coil of the motor generator from adversely affecting the rotation operation of the crankshaft of the engine made of a metal body. The operation is stabilized.

However, in the motor assist device for a vehicle disclosed in Japanese Patent Application Laid-Open No. H11-78558, a position detection sensor for detecting the rotational position of the rotor with respect to the stator of the motor generator is disposed close to the stator. There is a problem that magnetic flux and radio wave noise leaked from the stator adversely affect the position detection sensor, and noise is generated in a detection signal of the position detection sensor, and there is a disadvantage that control accuracy of the power generator is reduced.

[0008]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention provides an engine driven by the combustion of fuel, which is provided with a generator motor which is driven by electric energy and has a power generation function. The generator is constituted by a motor rotor and a motor stator arranged corresponding to the motor rotor, and is arranged corresponding to the sensor rotor and the sensor rotor so as to detect the rotational position of the motor rotor with respect to the motor stator. A rotation position sensor comprising a sensor stator; a motor case mounted on a cylinder block of the engine; and a motor case mounted on the motor case. The motor rotor is mounted on a rotor mounting member mounted on a crank shaft of the engine. And motor rotor for vehicle with sensor rotor attached Magnetic flux and / or radio noise leaked from the motor stator between the motor rotor and motor stator of the generator motor and the sensor stator of the rotational position sensor and / or a signal line connected to the sensor stator. It is characterized in that a magnetic shield member for shielding is provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic shield structure of a motor assist device for a vehicle according to the present invention is provided between a motor rotor and a motor stator of a generator motor and a sensor stator of a rotational position sensor and / or a signal line connected to the sensor stator. By providing a magnetic shielding member that shields magnetic flux and / or radio noise leaked from the motor stator, the rotational position sensor and / or signal line can be shielded from magnetic flux and radio noise leaked from the generator. It is possible to avoid the adverse effect of the magnetic flux leaked from the generator and the radio wave noise not only on the rotation position sensor but also on the signal line through which the detection signal of the rotation position sensor flows.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention. In FIG. 4, 2 is an engine mounted on a vehicle (not shown), 4 is a motor assist device for a vehicle, and 6 is a transmission. The engine 2 is driven by combustion of fuel, and is connected to a transmission 6 via a motor assist device 4 for a vehicle.

The engine 2 has a cylinder block 8, a cylinder head 10, a head cover 12, a lower case 14, and an oil pan 16, and a crankshaft 18 is provided below the cylinder block 8 by the lower case 14. A piston 22 slidably mounted on a cylinder 20 is connected to the crankshaft 18 by a connecting rod 24.

The engine 2 includes a cylinder head 10
Camshaft 26 rotated in synchronization with the crankshaft 18
And the exhaust camshaft 28 is supported. The intake camshaft 26 and the exhaust camshaft 28 are connected to the intake valve 3 of each cylinder 20.
0 and the exhaust valve 32 are respectively driven.

On the output side of the crankshaft 18 of the engine 2, the vehicle motor assist device 4 is provided. The motor assist device 4 is provided with a motor case 34 attached to the cylinder block 8 at the output end of the crankshaft 18, and a rotor mounting member 36 attached to the output end of the crankshaft 18.
Is provided.

As shown in FIGS. 2 and 3, the motor case 34 is mounted on the cylinder block 8 together with a transmission case 110 described later by mounting bolts 38. The motor case 34 is provided with a cylindrical motor stator mounting portion 40 on the transmission 6 side, and a passage wall portion 44 is formed on the outer periphery of the motor stator mounting portion 40 to form a cooling water passage 42 that opens to the transmission 6 side.
An annular sensor stator mounting portion 46 is provided on the engine 2 side. The motor case 34 is provided with a closing member 48 for closing the cooling water passage 42 attached to the transmission 6 side of the passage wall portion 44 with a mounting bolt 50, and cools a generator 78 described below at both longitudinal ends of the cooling water passage 42. Cooling water pipes 52 and 54 through which cooling water flows in and out are provided.

The rotor mounting member 36 includes a crankshaft 1
8 is provided on the crankshaft side flange portion 56 of the output end 8 together with the first flywheel 58 by the positioning pin 60 and mounted by the mounting bolt 62. First
The flywheel 58 has a starter driven gear 64 on the outer peripheral edge. The starter driven gear 64 is engaged with a starter drive gear of a starter motor (not shown).

The rotor mounting member 36 is provided with an annular motor-side flange portion 66 mounted on the crankshaft-side flange portion 56, and a sensor rotor mounting portion 68 is provided in a circumferential direction of an outer edge of the motor-side flange portion 66. An inner cylindrical portion 70 extending from the inner edge of the motor-side flange portion 66 to the transmission 6 side; and an outer cylindrical portion 72 extending from the outer edge of the motor-side flange portion 66 to the transmission 6 side coaxially with the inner cylindrical portion 70. A motor rotor mounting portion 74 is provided in the outer circumferential direction of the cylindrical portion 72, and an annular second flywheel 76 is provided at the end of the outer cylindrical portion 72 on the transmission 6 side so as to protrude radially outward.

The motor assist device 4 for a vehicle is provided at the output end of the crankshaft 18 with a power generator (motor) 78 which is driven by electric energy and has a power generating function, which is directly connected thereto, and detects the rotational position of the generator motor 78. A rotation position sensor 80 is provided.

The generator 78 comprises a motor rotor 82 and a motor stator 84 arranged corresponding to the motor rotor 82. The motor stator 84 has a motor stator core 86 and a motor stator coil 88,
A power line 90 is connected to the motor stator coil portion 88.

The generator 78 is provided with the motor rotor 82 positioned at the motor rotor mounting portion 74 of the rotor mounting member 36 and mounted with mounting bolts 92, and the motor stator core portion 86 of the motor stator 84 is mounted on the motor stator mounting portion 40 of the motor case 34. To the mounting bolt 9
4 attached.

The rotational position sensor 80 includes a motor stator 8
4 includes a sensor rotor 96 and a sensor stator 98 arranged corresponding to the sensor rotor 96 so as to detect the rotational position of the motor rotor 82. The sensor stator 98 has a sensor stator core section 100 and a sensor stator coil section 102, and is provided with a signal line 104 connected to the sensor stator coil section 102.

The rotational position sensor 80 includes a sensor rotor 96
Is positioned on the sensor rotor mounting portion 68 of the rotor mounting member 36 and mounted by a mounting tool 106, and the sensor stator core portion 100 of the sensor stator 98 is positioned on the sensor stator mounting portion 46 of the motor case 34 and mounted by mounting bolts 108. Provided.

The vehicle motor assist device 4 is provided with the transmission 6 connected to the second flywheel 76 side. The transmission 6 has a transmission case 110 and a motor case 34 attached to the cylinder block 8 of the engine 2 with mounting bolts 38.

As shown in FIG. 4, the transmission 6 includes an input shaft 1 that is supported by an input bearing 112 on an inner cylindrical portion 70 of a rotor mounting member 36 and a transmission case 110.
And an output shaft 11 supported by an output bearing 116 in the transmission case 110 in parallel with the input shaft 114.
8 and the reverse idler shaft 1 supported on the transmission case 110 in parallel with the input shaft 114 and the output shaft 118.
20 are provided.

The transmission 6 includes an end of the input shaft 114 on the side of the vehicle motor assist device 4 and the rotor mounting member 36.
And a second flywheel 76. The clutch 122 is connected to the second flywheel 76
The clutch disk 12 is provided on the clutch surface member 124 provided on the input shaft 114 so as to be axially movable and non-rotatable.
6 is pressed and separated by the pressure plate 128,
The driving force of the engine 2 and the generator 78 is transmitted to and cut off from the transmission 6.

The transmission 6 includes a clutch 122
The rotational speed and the torque of the driving force input through the input shaft 114 and the output shaft 118 are converted by a forward and reverse gear train 130 provided between the output shaft 118 and the reverse idler shaft 120, and the final reduction gear train 132 Thus, the transmission is transmitted to the differential 134 that is supported by the transmission case 110, and is transmitted to the left and right driving axles (not shown).

As described above, the motor assist device 4 for the vehicle is provided with the generator 2 having the function of generating electricity by directly driving the engine 2 with electric energy, and the rotational position sensor for detecting the rotational position of the generator 78. A generator 80 and a rotation position sensor 80 are mounted on the motor case 34 and the rotor mounting member 36.

The motor assist device 4 for the vehicle is provided between the motor rotor 82 and the motor stator 84 of the generator 78 and the sensor stator 98 of the rotational position sensor 80 and / or the signal line 104 connected to the sensor stator 98. A magnetic shield member 136 is provided to shield magnetic flux and / or radio noise leaked from the motor stator 84.

The anti-magnetic member 136 is formed of a non-magnetic material such as aluminum, stainless steel, steel, copper, or the like having anti-magnetism. The magnetic shield member 136 has a thick portion 138 located between the motor rotor 82 on the inner peripheral side and the sensor stator coil portion 102 of the sensor stator 98.
And an outer peripheral motor stator 84 and a sensor stator 98
And a thin-walled portion 140 located between the sensor stator core portion 100 and the sensor stator mounting portion 46.

The magnetic shielding member 136 is provided on the side facing the sensor stator 98 and the sensor stator mounting portion 46 with the storage groove 1.
42 is formed so as to be oriented in the radial direction. The storage groove 142 stores the signal line 104 connected to the sensor stator 98. The magnetic shield member 136 is provided with the thinnest portion, for example, the thinnest portion 140a of the thin portion 140 thinned by the formation of the storage groove 142 formed to have a thickness of 2 mm or more, and is provided with the motor rotor 82 of the generator 78. The thickest part 138a is formed and provided in the thick part 138 of the opposing part.

The magnetic shield member 136 is mounted together with the sensor stator 98 on the sensor stator mounting portion 46 of the motor case 34 with the mounting bolt 108 so as to cover the sensor stator 98 and / or the signal line 104. . The mounting bolt 108 is formed and provided of a non-magnetic material such as aluminum or stainless steel.
In addition, the motor case 34 and the rotor mounting member 36 are formed of nonmagnetic aluminum having antimagnetism.

The signal line 104 connected to the sensor stator 98 of the rotational position sensor 80 is connected to the motor case 34.
Through the space 146 from the through hole 144, and is connected to control means (not shown). Further, the power line 90 connected to the motor stator 84 of the generator 78 is separated from the signal line 104, led to the outside through the space 146 of the motor case 34, and connected to control means (not shown).

Next, the operation of the first embodiment will be described.

The motor assist device 4 for a vehicle is configured to directly connect the generator 2 to the engine 2 driven by the combustion of fuel, and to control the operating states of the engine 2 and the generator 78 in relation to each other by control means. Is assisted by the driving force of the power generator 78, and power is generated by the surplus driving force of the engine 2 to achieve the required performance (fuel consumption, harmful emission component value, power performance, etc.) at a high level.

The anti-magnetic structure of the motor assist device 4 is provided with an anti-magnetic member 136 that covers the sensor stator 98 and / or the signal line 104 of the rotational position detecting sensor 80. Magnetic flux and / or radio noise leaking from the motor stator 84 during the driving operation or the power generation operation of the generator 78 is shielded by the magnetic shield member 136 that covers the sensor stator 98 and the signal line 104 of the rotation position detection sensor 80, and detects the rotation position. It does not reach the sensor 80 or the signal line 104.

As a result, the magnetically shielded structure of the motor assist device 4 leaks out of the generator motor 78 not only to the rotational position sensor 80 but also to the signal line 104 through which the detection signal of the rotational position sensor 80 flows. It is possible to avoid adverse effects due to magnetic flux and radio noise.

Therefore, the magnetic shield structure of the vehicle motor assist device 4 can reduce the generation of noise in the detection signal of the rotational position sensor 80, and the generator 78
Control accuracy can be improved.

In the magnetic shield structure of the motor assist device 4 for a vehicle, a mounting bolt 108 for mounting the magnetic shield member 136 together with the sensor stator 98 to the motor case 34 is formed of a non-magnetic material. Since the mounting member 36 and the non-magnetic aluminum having the anti-magnetism are formed and provided, it is possible to more reliably avoid the adverse effect on the rotation position sensor 80 due to the magnetic flux and the radio noise leaking from the generator 78. This can further reduce the occurrence of noise in the detection signal of the rotational position sensor 80.

Further, the vehicle motor assist device 4
Of the motor case 34 by separating the power line 90 of the generator 78 from the signal line 104 of the rotational position sensor 80.
Of the power line 90 of the generator 78 can be prevented from entering the detection signal output by the rotational position sensor 80 by guiding the noise to the outside through the space 146.
Generation of noise in the detection signal of the rotation position sensor 80 can be reduced.

FIG. 5 shows a second embodiment. The vehicle motor assist device 4 according to the second embodiment includes a power generator 7.
8, a first magnetic shield member 148 is provided between the motor rotor 82 and the motor stator 84 and the sensor stator 98 and / or the signal line 104 of the rotational position sensor 80.
The motor rotor 82 of the generator 78 and the sensor rotor 9 of the rotational position sensor 80 are partially overlapped with the magnetic shield member 148 of FIG.
6 and sensor stator coil part 1 of sensor stator 98
The second magnetic shield member 150 is provided between the second magnetic shield member and the second magnetic shield member 150.

The first magnetic shield member 148 includes a thick portion 152
And the thin portion 154 are formed in a substantially annular plate shape, a storage groove portion 156 for the signal line 104 is formed, and a step portion 158 is formed in the thick portion 152 so as to be separated from the motor rotor 82. The second magnetic shielding member 150 is supported by the support portion 1 supported by the sensor rotor 96 on the motor-side flange portion 66.
60 and fitting portion 162 fitted along outer cylinder portion 72
And a protruding portion 164 located between the motor rotor 82 and the step portion 154, and is provided in a substantially hat shape in cross section.

The motor assist device 4 for a vehicle according to the second embodiment.
The first magnetic shield member 148 that covers the sensor stator 98 and / or the signal line 104 can shield magnetic flux and / or radio noise leaking from the motor stator 84 and reach the sensor stator 98 and the signal line 104. In addition, the magnetic flux and / or leaking from the motor stator 84 and wrapping around from the sensor rotor 96 side by the second magnetic shield member 150 that partially overlaps the first magnetic shield member 148 and covers the sensor rotor 96 and the sensor stator 98. Alternatively, radio noise can be shielded, and the sensor stator 9
No eight.

Thus, the magnetic shield structure of the vehicle motor assist device 4 of the second embodiment more reliably avoids the adverse effects of the magnetic flux leaked from the generator 78 and the radio wave noise on the rotational position sensor 80 and the signal line 104. This can further reduce the generation of noise in the detection signal of the rotation position sensor 80, and can improve the control accuracy of the generator 78.

FIG. 6 shows a third embodiment. The motor assist device 4 for a vehicle according to the third embodiment includes a motor stator 84 of the sensor rotor mounting portion 46 of the motor case 34.
A storage groove 166 is formed so as to be oriented in the radial direction on the side facing the first groove, and a through hole 168 that penetrates the sensor rotor mounting part 46 on the side facing the first flywheel 58 at the radial center of the storage groove 166. Is formed, and the signal line 104 is provided.
Is housed in the storage groove 166 and penetrated to the side facing the first flywheel 58 through the through hole 168, and is connected to the sensor stator coil portion 102 of the rotation position sensor 80 from the first flywheel 58 side. is there.

The motor assist device 4 for a vehicle according to the third embodiment.
The signal line 104 is housed in a housing groove 166 provided in the sensor rotor mounting portion 46, penetrates through the through hole 168, and is connected to the sensor stator coil portion 102 of the rotation position sensor 80 from the first flywheel 58 side. As a result, the signal line 104 can be disposed apart from the motor stator 84, and can be hardly affected by magnetic flux or radio noise leaked from the generator 78. The signal line 10 is connected to the portion 172 and the thin portion 174.
Since there is no need to provide the storage groove portion 142 (see FIG. 1) for the fourth, the magnetic shield member 170 can be formed thick, and the function of shielding magnetic flux leaked from the generator 78 and radio noise can be improved. .

Thus, the magnetically shielded structure of the motor assist device 4 for the vehicle according to the third embodiment can more reliably avoid the adverse effects of the magnetic flux leaked from the generator 78 and the radio wave noise on the rotational position sensor 80 and the signal line 104. This can further reduce the generation of noise in the detection signal of the rotation position sensor 80, and can improve the control accuracy of the generator 78.

In the above-described embodiment, the motor case 34, the rotor mounting member 36, and the mounting bolt 108 are formed of a non-magnetic material having anti-magnetism.
By providing the covering material 176 that covers the cover 04 with a non-magnetic material having anti-magnetism, it is possible to more reliably avoid the adverse effect on the signal line 104 due to the magnetic flux leaking from the generator 78 and radio noise. Rotational position sensor 80
, Can be further reduced.

[0047]

As described above, the magnetic shield structure of the motor assist device for a vehicle according to the present invention is provided with the magnetic shield member between the generator and the rotational position sensor and / or the signal line, thereby providing the rotational position sensor and the signal. The wire can be shielded from magnetic flux and radio noise leaking from the generator, and not only the rotational position sensor but also the signal line through which the detection signal from the rotational position sensor flows can be shielded by the magnetic flux and radio noise leaking from the generator. Adverse effects can be avoided.

Therefore, the magnetically shielded structure of the motor assist device for a vehicle can reduce the occurrence of noise in the detection signal of the rotational position sensor, and can improve the control accuracy of the generator.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a power generator and a rotation position sensor of a motor assist device for a vehicle according to a first embodiment.

FIG. 2 is a sectional view of a motor assist device for a vehicle.

FIG. 3 is a front view of the motor assist device for a vehicle indicated by an arrow 3 in FIG. 2;

FIG. 4 is a cross-sectional view of an engine provided with a motor assist device for a vehicle.

FIG. 5 is an enlarged sectional view of a main part of a power generator and a rotation position sensor showing a second embodiment.

FIG. 6 is an enlarged sectional view of a main part of a power generator and a rotation position sensor showing a third embodiment.

[Explanation of symbols]

 Reference Signs List 2 engine 4 vehicle motor assist device 6 transmission 8 cylinder block 18 crankshaft 34 motor case 36 rotor mounting member 78 generator motor 80 rotation position sensor 82 motor rotor 84 motor stator 96 sensor rotor 98 sensor stator 104 signal line 136 magnetic shielding member

Claims (5)

[Claims] An engine driven by the combustion of fuel is provided with a generator which is driven by electric energy and has a function of generating electricity by directly connecting the generator to a motor rotor and a motor stator arranged corresponding to the motor rotor. A rotational position sensor comprising a sensor rotor and a sensor stator arranged corresponding to the sensor rotor so as to detect a rotational position of the motor rotor with respect to the motor stator, and attached to a cylinder block of the engine. The motor assist device for a vehicle, wherein the motor stator and the sensor stator are respectively mounted on a mounted motor case, and the motor rotor and the sensor rotor are mounted on a rotor mounting member mounted on a crankshaft of the engine. Motive motor rotor and motor stator A vehicle provided with a magnetic shield member for shielding magnetic flux and / or radio noise leaked from the motor stator between a sensor stator of the rotational position sensor and / or a signal line connected to the sensor stator. Magnetic shield structure of motor assist device. 2. The motor for a vehicle according to claim 1, wherein the sensor stator of the rotational position sensor and the magnetic shield are mounted on the motor case by mounting bolts formed of a non-magnetic material. Magnetic shield structure of the assist device. 3. The magnetic shield according to claim 1, wherein the thickness of the thinnest portion is 2 mm.
The magnetically shielded structure of a motor assist device for a vehicle according to claim 1, wherein the magnetically shielded structure is formed and provided. 4. The magnetically shielded structure of a motor assist device for a vehicle according to claim 1, wherein the motor case and the rotor mounting member are formed of aluminum. 5. The magnetic shield structure of a motor assist device for a vehicle according to claim 1, wherein the magnetic shield member is provided with a thickest portion formed at a portion facing the motor rotor of the power generator.