JP2011166845A - Rotating electric machine, and motor-driven power steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily manufacture, or assemble a rotating electric machine while achieving reduction in vibration or noise of the rotating electric machine. <P>SOLUTION: The rotating electric machine 1 has: a bottomed cylindrical case 10 for housing a rotor 61 and a stator 62; a lid 11 for closing an opening of the case 10 and allowing an output shaft of the rotor 61 to penetrate; and a flange member 12 having a case insertion hole 12a capable of inserting the case 10, and having an attaching part 12b attachable to the outer circumference of the case 10 and used to attach the rotating electric machine 1 to an attaching object. The flange member 12 has arms 70 for pressing the outer circumferential surface of the case 10. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a rotating electrical machine and an electric power steering device.

  2. Description of the Related Art Conventionally, an electric power steering device (EPS) has been proposed and put into practical use in an automobile steering system. At present, the development of an electric power steering device that generates an auxiliary steering torque by a rotating electrical machine in accordance with the steering torque applied to the steering wheel and transmits the auxiliary steering torque to the steering shaft is underway.

  In the electric power steering apparatus described above, the rotating electrical machine is connected to the steering shaft via the speed reduction mechanism, and the rotation of the rotating electrical machine is transmitted to the steering shaft after being decelerated by the speed reduction mechanism.

  In the electric power steering apparatus described above, the rotating electrical machine is used as a drive source, and steering is assisted through the speed reduction mechanism. Therefore, an operating sound due to vibration is generated from the rotating electrical machine and the speed reduction mechanism. In recent years, quietness of vehicles such as hybrid vehicles (HV) has been increased, and there is an increasing demand for reduction of operating noise in the electric power steering apparatus. Therefore, in order to reduce vibration and noise of the rotating electrical machine, it has been proposed to provide an elastic body and a sound absorbing material on the outer peripheral wall of the rotating electrical machine (see Patent Documents 1 and 2).

JP 2009-55743 A Japanese Patent Laid-Open No. 2007-210386

However, since the rotating electrical machine fixes a new member for reducing vibration and noise to the outer peripheral wall of the case, the manufacturing process such as assembly of the rotating electrical machine becomes complicated and takes time. Further, when a new separate member is fixed, for example, the reliability of the fixing strength of the separate member when used for a long time becomes a problem.

  The present invention has been made in view of the above points, and is easy to manufacture such as assembling while realizing reduction of vibration and noise, and does not cause a problem of fixing strength of a portion realizing reduction of vibration and noise. It is an object of the present invention to provide a rotating electrical machine and an electric power steering apparatus having the rotating electrical machine.

  In order to achieve the above object, the present invention provides a cylindrical case with a bottom that accommodates a rotor and a stator, a lid that closes the opening of the case and allows the output shaft of the rotor to pass, and the case can be inserted. A flange member that has a case insertion hole and can be attached to the outer periphery of the case, and has an attachment portion for attaching the rotating electrical machine to the attachment object, and the flange member has an outer periphery of the case It is a rotating electrical machine having an arm portion for holding a surface.

  According to the present invention, since the vibration of the case can be suppressed by pressing the outer peripheral surface of the case with the arm portion of the flange member, it is not necessary to fix a new separate member on the outer peripheral wall of the case as in the prior art. For this reason, manufacture, such as an assembly of a rotating electrical machine, can be easily performed while realizing reduction of vibration and noise of the rotating electrical machine. Further, since the flange member has the arm portion, the problem of the fixing strength of the portion that realizes the reduction of vibration and noise as in the conventional case does not occur. For this reason, the reliability of the rotating electrical machine is improved.

  The flange member may have a plurality of the arm portions along the circumferential direction of the outer peripheral surface of the case. In such a case, the vibration and noise of the case can be reliably reduced.

  The main body of the flange member provided with the case insertion hole is attached to the opening side of the case, and the arm portion extends along the outer peripheral surface of the case from the main body toward the bottom side of the case. It may extend. In such a case, the vibration of the case can be more effectively suppressed by pressing the abdomen of the vibration wave generated at a predetermined position in the axial direction (direction from the opening side toward the bottom side) according to the vibration mode generated in the case.

  The arm portion may be provided with a vibration absorbing member that contacts the outer peripheral surface of the case and absorbs vibration. In such a case, even if vibration occurs in the case, the vibration can be absorbed and the vibration of the case can be suppressed. Therefore, vibration and noise of the rotating electrical machine can be more reliably suppressed.

  A control unit that controls driving of the rotating electrical machine may be attached to the flange member. In such a case, the control unit can be easily removed by removing the flange member.

  A flange attachment portion for attaching the flange member is formed on an outer peripheral portion of the case, and the flange member can be attached to the flange attachment portion by inserting the case from the bottom side of the case. Good. In this case, since the case can be inserted from the bottom side with less wiring and the flange member can be attached to the case, the flange member can be easily attached.

  The present invention according to another aspect is an electric power steering apparatus having the rotating electric machine described above. According to the present invention, it is possible to easily manufacture the assembly of the rotating electrical machine while reducing the vibration and noise of the rotating electrical machine, and there is a problem of the fixing strength of the part that realizes the reduction of the vibration and noise. An electric power steering device that does not occur can be realized.

According to the present invention, it is possible to realize a rotating electrical machine that can be easily manufactured while reducing vibration and noise. In addition, since the problem of the fixing strength of the portion that realizes the reduction of vibration and noise does not occur, the reliability of the apparatus is improved.

It is a perspective view of a rotary electric machine. It is the front view which looked at the rotary electric machine from the front side. It is sectional drawing of the rotary electric machine which shows a mutual attachment part of a case, a flange member, and a cover part. It is sectional drawing of the rotary electric machine which shows the attaching part of a flange member. It is sectional drawing of the rotary electric machine which shows the structure of an arm part. It is the reverse view which looked at the rotary electric machine from the rear side. It is sectional drawing of an arm part. (A) is explanatory drawing which shows the state before fitting a flange member in a case, (B) is explanatory drawing which shows the state which fitted the flange member in the case. It is explanatory drawing which shows the outline of a structure of an electric power steering apparatus. It is explanatory drawing which shows the outline of a structure of a worm reduction mechanism. It is the front view which looked at the rotary electric machine which has a control unit from the front side. It is sectional drawing of the rotary electric machine which has a control unit. It is the reverse view which looked at the rotary electric machine which has a control unit from the rear side.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a rotating electrical machine 1 according to the present embodiment. FIG. 2 is a front view of the rotating electrical machine 1 as viewed from the front side. 3 is a sectional view of the rotating electrical machine 1 along the line II shown in FIG. 2, FIG. 4 is a sectional view of the rotating electrical machine 1 along the line II shown in FIG. 2, and FIG. It is sectional drawing of the rotary electric machine 1 along the I-III line shown in FIG. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  For example, as shown in FIG. 1, the rotating electrical machine 1 includes a bottomed cylindrical case 10, a lid 11 that closes an opening of the case 10, and a flange member 12 that can be attached to the outer periphery of the case 10. .

  For example, as shown in FIG. 3, the case 10 has a bottomed cylindrical shape in which an axial front side (left side in FIG. 3) surface is open and a rear side (right side in FIG. 3) surface is closed. Yes. The lid 11 closes the opening on the front side of the case 10.

As shown in FIGS. 2 and 3, a flange mounting portion 10 a protruding outward is formed at the front end portion of the case 10 for mounting the lid portion 11 and the flange member 12. A through hole 10b is formed in the flange mounting portion 10a. The flange mounting portions 10a are formed at a plurality of locations, for example, at two locations facing each other on the diameter of the case 10 as shown in FIG.

 As shown in FIG. 3, a rotor 21 that rotates the shaft 20 and a stator 22 that is fixed to the case 10 are provided in the case 10.

The stator 22 is fixed to the inner wall surface of the case 10. The stator 22 is fixed to the case 10 by press fitting, bonding, shrink fitting or the like. The stator 22 has a cylindrical stator core 30. An insulator 31 is inserted into the stator core 30, and a coil 32 is wound around in this state. In the case of a three-phase motor, 3n (n is an integer) stator cores may be integrated by press fitting, welding, or the like for each yoke part (back yoke). The stator core that is not integrated may be press-fitted into the case 10.

  The rotor 21 is installed inside the stator 22. The rotor 21 has a rotor core inside, and the shaft 20 passes through the axis. Further, 2n segment magnets (n is an integer) or a ring magnet is provided on the outer peripheral surface of the rotor core. The outer periphery of the rotor core may be provided with irregularities on the surface in contact with the segment magnet. An embedded magnet type in which magnets are arranged may be used inside the rotor core. The rotor cover is made of a thin non-magnetic material (for example, stainless steel, aluminum, heat-shrinkable tube, etc.), and can be installed by press fitting, shrink fitting, welding, or the like from the rotor axial direction.

A recess 10c is formed at the center of the bottom of the rear side of the case 10, and a bearing 40 that supports the rear side of the shaft 20 is provided in the recess 10c.

  A terminal block 50 that is electrically connected to the coil 32 of the stator 22 is installed on the front side of the stator 22. In addition, a power harness 51 for supplying power to the stator 22 is electrically connected to the terminal block 50. The power harness 51 is connected to an external power source through a through hole 10 d provided in the case 10 and a notch 12 e in the flange member 12. A grommet 52 is installed in the through hole 10 d and the notch 12 e, and the power harness 51 communicates with the outside of the case 10 through a hole in the grommet 52.

The case 10 is divided into a rear portion 10R side that accommodates the stator 22 and a front portion 10F side that accommodates the terminal block 50, and a taper is provided between them. The diameter of the front portion 10F is larger than the rear portion 10R. Is slightly larger.

The lid portion 11 is formed in a thin circular shape, for example. The lid 11 has a through hole 11a through which the front side of the shaft 20 passes in the center, a rear surface recess 11b provided at the center of the rear side surface of the lid 11, and a front provided at the center of the front side surface. A surface recess 11c is provided. A bearing 60 that supports the front side of the shaft 20 is provided in the rear surface recess 11b, and a resolver sensor 61 that detects the rotational position of the shaft 20 by the rotor 21 is provided in the front surface recess 11c.

The resolver sensor 61 includes a cylindrical resolver rotor 62 that is press-fitted into the shaft 20, and a resolver stator 63 that surrounds the outer periphery of the resolver rotor 62. The resolver stator 63 is fixed to the front surface recess 11c by press fitting, caulking, welding or the like. As shown in FIG. 2, the resolver stator 63 is electrically connected to a sensor harness 64 that leads to an external output unit. The sensor harness 64 may communicate from the outside of the case 10 to the output unit, or may communicate from the inside of the case 10 to the output unit.

As shown in FIGS. 2 and 3, the lid portion 11 is formed with a mounting portion 11 d protruding outward for mounting the case 10 and the flange member 12. The attachment portion 11d is formed with a long and long through hole 11e in an arc shape. With the elongated through hole 11e, the attachment position in the circumferential direction of the lid 11 can be adjusted, and the initial position of the resolver sensor 61 can be adjusted. The attachment portions 11d are formed at a plurality of locations, for example, two locations facing each other on the diameter of the lid portion 11.

For example, as shown in FIG. 4, the flange member 12 is formed in an annular shape, for example, and has a circular case insertion hole 12 a into which the case 10 can be inserted. The case insertion hole 12a is slightly smaller than the diameter of the case 10 on the front portion 10F side so that, for example, the case 10 can be inserted from the bottom side of the case 10 and the flange member 12 can be installed on the outer peripheral surface on the front side of the case 10. Has a large diameter. An attachment portion 12 b for attaching to the attachment object of the rotating electrical machine 1 is formed on the outer peripheral portion of the flange member 12. The attachment portions 12b are formed at a plurality of locations, for example, at two locations facing each other on the diameter of the case insertion hole 12a as shown in FIG. For example, a screw hole 12c is formed in the attachment portion 12b, and the rotating electrical machine 1 can be attached to an attachment object by fitting a screw into the screw hole 12c.

  Further, as shown in FIG. 3, screw holes 12 d for attaching to the lid portion 11 and the case 10 are formed in the outer peripheral portion of the flange member 12. As shown in FIG. 2, the screw holes 12d are formed at a plurality of locations, for example, two locations facing each other on the diameter of the case insertion hole 12a. By fixing the bolt member 65 through the screw hole 12d of the flange member 12, the through hole 11e of the lid portion 11 and the through hole 10b of the case 10, the flange member 12, the lid portion 11 and the case 10 can be fixed to each other.

  As shown in FIGS. 1 and 5, the flange member 12 has an arm portion 70 that presses the outer peripheral surface of the case 10. The arm portion 70 is formed in a plate shape extending from the front portion 10R side toward the rear portion 10R side along the outer peripheral surface of the case 10 from the ring-shaped main body 71 in which the case insertion hole 12a is formed. As shown in FIG. 6, the arm portions 70 are formed at a plurality of positions, for example, at four positions at equal intervals along the case insertion opening 52 a. As shown in FIG. 5, the arm portion 70 reaches the case rear portion 10 </ b> R having a smaller diameter than the front portion 10 </ b> F, and a vibration absorbing member 70 a that protrudes toward the case 10 and abuts on the outer peripheral surface of the case 10. Is provided. The vibration absorbing member 70a is formed of an elastic body such as rubber. For example, as shown in FIG. 7, the vibration absorbing member 70a is inserted into the arm portion 70 or formed by insert molding, and is locked to the arm portion 70 by a convex portion 70b protruding in the left and right circumferential directions. The arm portion 70 can hold the case 10 to suppress vibration of the case 10. Further, the vibration of the case 10 can be absorbed by the vibration absorbing member 70a.

When assembling the rotating electrical machine 1 configured as described above, for example, as shown in FIG. 8A, the flange member 12 is fitted into the outer peripheral surface of the case 10 from the bottom side of the case 10, and FIG. As shown in FIG. 3, the case 10 is disposed on the outer peripheral surface of the front portion 10F side. Thereafter, the bolt 65 is fitted into the through hole 11e of the lid part 11, the through hole 10b of the case 10, and the screw hole 12d of the flange member 12, and the flange member 12, the case 10, and the lid part 11 are temporarily fixed.

Thereafter, the rotor 21 is rotated, and the position of the resolver sensor 61 is adjusted by rotating the lid 11 so that the induced voltage generated at that time matches the rotational position signal detected by the resolver sensor 61. After the adjustment, the lid 11 is fixed to the flange member 12 and the case 10 with the bolt 65. At this time, the arm portion 70 holds at least the outer peripheral surface of the rear portion 10 </ b> R of the case 10 housing the stator 22. Thereafter, a screw is fitted into the screw hole 12c of the attachment portion 12b of the flange member 12, and the rotating electrical machine 1 is attached to a predetermined attachment object.

  According to the above embodiment, since the vibration of the case 10 can be suppressed by pressing the outer peripheral surface of the case 10 by the arm portion 70 of the flange member 12, it is not necessary to fix a new separate member to the case as in the prior art. . For this reason, manufacture, such as an assembly of the rotary electric machine 1, can be easily performed while realizing reduction of vibration and noise of the rotary electric machine 1. Moreover, since the flange member 12 has the arm part 70, the fixing strength of the part which implement | achieves the reduction | restoration of a vibration and noise unlike the past does not become a problem, and the reliability of the rotary electric machine 1 can be improved.

  Moreover, since the flange member 12 can be attached to the outer periphery of the case 10, the flange member 12 overlaps with the outer periphery of the case 10, and the axial length of the rotating electrical machine 1 can be shortened accordingly. Therefore, the mountability of the rotating electrical machine 1 can be improved.

  Since the flange member 12 has a plurality of arm portions 70 along the circumferential direction of the outer peripheral surface of the case 10, the vibration of the case 10 can be reliably suppressed.

  Since the arm portion 70 extends from the main body 71 of the flange member 12 along the outer peripheral surface of the case 10 toward the bottom side of the case 10, the rear portion 10R side of the case 10 having the stator 22 that easily vibrates is provided. I can hold it down. Further, the vibration of the case 10 can be more effectively suppressed by pressing the abdominal part of the axial vibration wave generated in the case 10.

  Since the arm portion 70 is provided with a vibration absorbing member 70a that contacts the outer peripheral surface of the case 10 and absorbs vibration, in such a case, even if vibration occurs in the case 10, the vibration is absorbed, and the case 10 Can be suppressed. Therefore, vibration and noise of the rotating electrical machine 1 can be more reliably suppressed.

  The flange member 12 can be attached to the flange attachment portion 10a by inserting the case 10 from the bottom side of the case 10. For this reason, since the case 10 can be inserted from the bottom side with few wiring and the flange member 12 can be attached to the case 10, attachment of the flange member 12 can be performed easily.

  Next, an example in which the rotating electrical machine 1 described above is mounted on an electric power steering device will be described. FIG. 9 is an explanatory diagram showing an outline of the configuration of the electric power steering apparatus 90 having the rotating electrical machine 1.

  The electric power steering device 90 is, for example, a column type, and corresponds to a steering shaft 100 to which a vehicle steering wheel H is fixed, a rack and pinion motion conversion mechanism 101, and a steering torque applied to the steering wheel H. A rotating electrical machine 1 that generates auxiliary steering torque, a worm reduction mechanism 102 that is interposed between the rotating electrical machine 1 and the steering shaft 100 and decelerates the rotation of the rotating electrical machine 1, and a control unit 103 that controls driving of the rotating electrical machine 1. Etc.

  The steering shaft 100 has a steering input shaft 100 a and a steering output shaft 100 b and is covered with a housing 120. A steering wheel H is fixed to the upper end of the steering input shaft 100a. The steering input shaft 100 a and the steering output shaft 100 b are connected via a torsion bar of the torque sensor 121. The steering torque generated by the operation of the steering wheel H is detected by the torque sensor 121 through the steering input shaft 100a and output to the control unit 103. The output of the rotating electrical machine 1 is output by the control unit 103 based on the detected steering torque. Be controlled.

  For example, as shown in FIG. 10, the worm reduction mechanism 102 includes a worm wheel 130 attached to the steering output shaft 100 b and a worm 131 that meshes with the outer peripheral gear of the worm wheel 130. The worm 131 is supported by two bearings 133 and 134 that are fixed to the housing 132. One end of the worm 131 is coaxially coupled to the shaft 20 of the rotating electrical machine 1 by a spline structure. Thus, for example, the axial reaction force received by the worm 131 by driving the steering output shaft 110b and the worm wheel 130 can be absorbed by the worm speed reduction mechanism 102.

  As shown in FIG. 9, the steering output shaft 100 b and the rack and pinion motion conversion mechanism 101 are connected by two universal joints 140 and 141 and a connecting member 142. The rack and pinion motion conversion mechanism 101 connects the steering output shaft 100b and the tie rod of the operation wheel by a rack and pinion gear.

  The rotational force output by the rotating electrical machine 1 is transmitted to the steering output shaft 100b as auxiliary steering torque via the worm reduction mechanism 102, and the auxiliary steering torque is transmitted from the steering output shaft 100b to the rack and pinion motion conversion mechanism 101. To the tie rod of the operation wheel.

  The control unit 103 is provided integrally with the flange member 12 of the rotating electrical machine 1. 11 is a front view of the rotating electrical machine 1 having the control unit 103, and FIG. 12 is a cross-sectional view of the rotating electrical machine 1 taken along line IV-IV in FIG. FIG. 13 is a back view of the rotating electrical machine 1 as seen from the rear side.

For example, the control unit 103 is covered with the casing 150. As shown in FIG. 11, a connector 151 for electrically connecting the sensor harness 64 is provided on the side surface of the housing 150. A recess 150a is formed on the front side of the housing 150, and a connector 152 for electrically connecting the bus bar 51a is provided in the recess 150a. The control unit 103 can obtain information on the steering torque detected by the torque sensor 121 and the rotational position information detected by the resolver sensor 61. Further, the control unit 103 can control the driving of the rotating electrical machine 1 by supplying power to the stator 22 through the bus bar 51a based on the steering torque information and the like.

  According to the present embodiment, it is possible to realize the electric power steering device 90 that can be easily manufactured such as assembling while realizing reduction of vibration and noise. In addition, since the control unit 103 that controls the driving of the rotating electrical machine is attached to the flange member 12, the control unit 103 can be easily removed by removing the flange member 12.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  For example, the configuration in the case 10 described in the above embodiment may be another configuration. For example, the resolver sensor 61 and the bearing 60 are opposite to each other, and the bearing is provided in the front surface recess 11c outside the lid portion 11. 60, and the resolver sensor 61 may be provided in the rear surface recess 11b inside the lid portion 11. Moreover, the arm part 70 may also have another shape. In addition, a member other than the control unit may be attached to the flange member 12. Moreover, in the said embodiment, although the rotary electric machine 1 was shown as the example applied to the electric power steering apparatus 90, this invention is applicable also to the rotary electric machine of the apparatus of another use.

INDUSTRIAL APPLICABILITY The present invention is useful for realizing a rotating electrical machine that can be easily manufactured such as assembling while reducing vibration and noise.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 10 Case 11 Cover part 12 Flange member 12a Case insertion hole 12b Attachment part 20 Shaft 21 Rotor 22 Stator 70 Arm part 90 Electric power steering apparatus

Claims (7)

A bottomed cylindrical case for housing the rotor and stator;
A lid that closes the opening of the case and passes the output shaft of the rotor;
A flange member that has a case insertion hole into which the case can be inserted, can be attached to the outer periphery of the case, and has an attachment portion for attaching the rotating electrical machine to the attachment object;
The said flange member is a rotary electric machine which has the arm part which hold | suppresses the outer peripheral surface of the said case.   The rotating electrical machine according to claim 1, wherein the flange member includes a plurality of the arm portions along a circumferential direction of an outer peripheral surface of the case. The body of the flange member provided with the case insertion hole is attached to the opening side of the case,
The rotating electrical machine according to claim 1, wherein the arm portion extends along an outer peripheral surface of the case from the main body toward a bottom side of the case.   The rotating electrical machine according to any one of claims 1 to 3, wherein the arm portion is provided with a vibration absorbing member that contacts the outer peripheral surface of the case and absorbs vibration.   The rotating electrical machine according to claim 1, wherein a control unit that controls driving of the rotating electrical machine is attached to the flange member. A flange mounting portion for mounting the flange member is formed on the outer peripheral portion of the case,
The rotating electrical machine according to any one of claims 1 to 5, wherein the flange member can be attached to the flange mounting portion by inserting the case from the bottom side of the case.   An electric power steering apparatus comprising the rotating electrical machine according to claim 1.

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