JP5365483B2 - Electric power steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric power steering device whose entire axial length can be reduced to achieve miniaturization and weight reduction to provide improved mountability in mounting on a vehicle, etc., and versatility in vehicle layout. <P>SOLUTION: The electric power steering device includes a case 10 housing a rotor 15 and a stator 11, and a bracket 50 which is disposed on the opening-side of the case 10 to support the output-side end 20F of a rotor shaft 20. The bracket 50 includes a flange 51 which has a case insertion hole 55 and fitting parts 56A and 56B suitable for a speed reducer 100 and is disposed on the case 10 that is inserted in the case insertion hole 55 with the case bottom first, and a resolver holder 52 which supports a bearing supporting a resolver stator 72 and pivotally supporting on the output-side end 20F and covers the opening of the case 10. The case 10 has fixed parts 18A and 18B held between the resolver holder 52 and the flange 51 to be fixed removably. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an electric power steering apparatus including a rotating electrical machine having a bottomed cylindrical case that houses a rotor and a stator, and a bracket portion that is disposed on the opening side of the case and supports one end of the rotor. Regarding improvements.

  Conventionally, for example, a rotating electrical machine that is suitably used in an electric power steering (hereinafter referred to as “EPS (Electric Power Steering)”) device that assists steering operation by rotating a motor has been used in a bottomed cylindrical case. The rotor and the stator are accommodated, the opening of the case is covered with a bracket portion, and the case and the bracket portion are fixed with screws. One end of the shaft of the rotor is pivotally supported by a ball bearing disposed on the bottom of the case, and the other end of the shaft is pivotally supported by a ball bearing disposed on the bracket portion. The rotating electrical machine has a configuration in which a harness for supplying power to the coil of the stator is pulled out from the side surface of the bracket portion, and the resolver stator is rotated from the outside to align the induced voltage and the sensor signal. Therefore, the resolver stator has a structure in which a screw hole for fixing the position is provided, the resolver stator is fixed to the resolver holder, and the resolver holder is fixed to the case with screws. (For example, see Patent Documents 1 to 4).

  Further, an electronic control unit (ECU: Electronic Control Unit, hereinafter referred to as “ECU”) for controlling the driving of the rotating electrical machine is fixed to the flange portion formed in the bracket portion of the rotating electrical machine, An electric power steering device in which a stator of a rotating electrical machine and an ECU are connected via a bus bar is also introduced. (For example, refer to Patent Documents 5 to 9).

JP 2008-193896 A JP 2007-89285 A JP 2006-320189 A JP 2006-94678 A Japanese Patent No. 3593102 WO2007 / 26894 JP 2008-109837 A JP 2007-237790 A JP 2004-23841 A

  In the rotating electrical machine having the above-described configuration, the total axial length is determined by the sum of the axial length of the case and the axial length (length corresponding to the thickness) of the bracket portion. Further, the axial length of the stator and the rotor needs to be increased as the output of the rotating electrical machine increases. Therefore, for example, a high-output rotating electrical machine used in an EPS apparatus inevitably has a long overall axial length, and therefore, when mounted on a vehicle, there is a high possibility of interference with the vehicle. In particular, in the case of a rotating electrical machine disposed outside a vehicle, an O-ring is disposed between the case and the bracket portion, or a waterproof property is applied by applying a sealing agent, so that the axial direction The total length of is further increased. Moreover, in order to ensure the waterproofness of a harness part, although the grommet is normally provided in the bracket part, the shape of a bracket part becomes complicated by this, and the length of the axial direction of a bracket part also increases. Therefore, it is difficult to improve the mountability on the vehicle.

  Therefore, the mounting on the vehicle is dealt with by changing the layout such as arranging the rotating electrical machine on the speed reducer side. In this case, the harness is the shortest path in order to secure the path of the harness. Must be diverted from position. Therefore, there is a possibility that the harness becomes unnecessarily long, a problem such as an increase in resistance occurs, or the cost increases.

  In addition, the conventional electric power steering apparatus described in Patent Documents 5 to 9 needs to be provided with a screw part for fixing the flange part and the ECU, and also provided with a part for connecting the bus bar and the sensor. The axial length (length corresponding to the thickness) of the part becomes longer. For this reason, as a result of an increase in the total length including the ECU, it is difficult to improve the mountability to the vehicle, and the mass increases, and it is difficult to achieve a reduction in size and weight.

  The present invention has been made in view of such circumstances, and the overall length in the axial direction can be shortened as compared with a conventional rotating electric machine having the same output, so that a reduction in size and weight can be achieved. It is an object of the present invention to provide an electric power steering apparatus including a rotating electric machine that is improved in mountability and improved in versatility with respect to a vehicle layout.

  To achieve this object, the present invention includes a bottomed cylindrical case that houses a rotor and a stator, and a bracket portion that is disposed on the opening side of the case and supports an output side end of the shaft of the rotor. A rotating electrical machine that can be attached to an object, wherein the bracket portion includes a case insertion hole into which the case is inserted from the bottom side of the case, and an attachment portion that is attached to the object. A flange portion disposed in the case inserted into the case insertion hole; and a bearing supporting the resolver stator and supporting the output side end portion of the shaft, and disposed on the opening side of the case. A resolver holder that covers the opening of the case, and the case is sandwiched between the resolver holder and the flange portion, and the resolver holder and the flange portion are detachably fixed. There is provided an electric power steering apparatus provided with a rotary electric machine comprising a stationary part to be.

  In the electric power steering apparatus having this configuration, the bracket part is separated into the flange part and the resolver holder, and the flange part has a function for attaching the electric power steering apparatus to an object and a case. As long as it has a function of being detachably fixed to the case in a state of being inserted into the insertion hole, the shape of the flange portion can be simplified and the axial length of the flange portion can be simplified. Can be shortened (thickness is reduced), and the flange portion can be reduced in size and weight. Further, since the flange portion and the resolver holder are separated, and the housing portion, the case and the resolver holder are configured to be detachable, if the shape of either the flange portion or the resolver holder is changed, It can correspond to the layout of the vehicle. Therefore, compared with the case where the shape of the whole bracket part is changed, the change cost can be reduced.

  The electric power steering apparatus according to the present invention further includes an electronic control unit that controls driving of the rotating electrical machine, and has a configuration in which the flange portion and the casing of the electronic control unit are integrally formed. be able to. With this configuration, there is no need to screw the flange portion and the housing of the electronic control unit. Therefore, even if the electric power steering apparatus has the electronic control unit, the shape of the flange portion can be simplified, and the axial length of the flange portion is shortened (thinness is reduced). be able to. Further, the connection between the rotating electrical machine and the electronic control unit can be realized with a simple structure.

  In the electric power steering apparatus according to the present invention, since the flange portion is detachably fixed to the case in a state where the case is inserted into the case insertion hole of the flange portion, the case and the flange portion are arranged in the axial direction. It becomes the structure which overlapped in. Therefore, compared to the conventional rotating electric machine with the same output in which the case and the flange portion are not overlapped in the axial direction and the electric power steering device equipped with the electronic control unit, the axial length is the same in the axial direction in which both are overlapped. Therefore, it is possible to reduce the size and weight. For this reason, while being able to improve the mounting property to a vehicle etc., manufacturing cost can be reduced.

  Examples of the object to which the electric power steering device is attached include a reduction gear, a drive mechanism (for example, opening / closing drive, rotation drive, slide drive, etc.), and the rotating electrical machine You may attach to housing | casings etc., such as a control apparatus for driving.

  In the electric power steering apparatus according to the present invention, the resolver holder, the fixing portion, and the flange portion are formed with screw holes that can communicate with each other, and the resolver holder, the fixing portion, and the flange portion are provided with screw holes that are in communication with each other. A configuration can be provided that is fastened together by an inserted screw. By comprising in this way, the number of arrangement | positioning (number of screw points) of the screw which fixes a case and a bracket part can be reduced.

  Further, the screw hole formed in the resolver holder can be constituted by a long hole that is long in the circumferential direction. With this configuration, in addition to the above advantages, the resolver holder and the flange portion are temporarily fixed to the fixed portion of the case, and then the circumferential position of the rotational position detection sensor (for example, the resolver rotor) that is a component of the resolver. Position adjustment can be performed easily.

  Furthermore, in the electric power steering device according to the present invention, the screw hole of the flange portion is formed in the vicinity of the mounting portion, and the screw inserted into the communicating screw hole is between the object and the flange portion. It can also comprise so that it may be located in. By configuring in this way, in addition to the advantages, it is possible to prevent the screw and the flange portion from unexpectedly falling off, so there is no need to separately provide a screw retaining mechanism, and the component The number of points can be further reduced, and the weight and cost can be reduced.

  In the electric power steering apparatus according to the present invention, a seal member is disposed in a space defined by an inner wall that defines a case insertion hole of the flange portion, an opening end surface of the case, and an outer peripheral surface of the resolver holder. And a configuration for holding the inside of the case watertight by the seal member. By comprising in this way, in addition to the above-mentioned advantage, it is possible to seal (hold watertight) between the flange portion and the case and between the case and the resolver holder by one sealing member, The number of parts can be reduced.

  Furthermore, in the electric power steering device according to the present invention, a resolver stator storage portion in which the resolver stator is stored is formed at a central portion of the resolver holder, and the resolver stator storage portion is electrically connected to the resolver stator. It is also possible to provide a configuration having an outlet through which the connected sensor harness is drawn out. By comprising in this way, when the attachment part of a flange part is attached to the said target object, the said sensor harness can be pulled out from between a target object and a resolver holder. Therefore, in addition to the advantages, the sensor harness can be pulled out in an arbitrary radial direction of the rotating electrical machine (that is, from an arbitrary position in the circumferential direction around the shaft), thereby improving versatility with respect to the vehicle layout. Can do. For this reason, it can suppress that the design change of a rotary electric machine is needed according to a vehicle layout. Further, since the sensor harness can be pulled out in an arbitrary radial direction of the rotating electrical machine, the sensor harness can be easily routed and the total length of the sensor harness can be shortened.

  In addition, the electric power steering apparatus according to the present invention can have a structure in which the stator and the electronic control unit are connected via a bus bar terminal or a harness. By comprising in this way, the connection structure of the said stator and the said electronic control unit can be simplified.

  In the electric power steering apparatus according to the present invention, a heat sink portion can be provided in the casing of the electronic control unit. In this case, the heat sink part can be disposed on the flange part. With this configuration, it is possible to prevent the axial length of the electric power steering apparatus from being increased even if the heat sink portion is provided.

  According to the present invention, the overall length in the axial direction can be shortened as compared with a conventional rotating electric machine having the same output, miniaturization and weight reduction are achieved, and mounting on a vehicle or the like is improved, and a vehicle layout is achieved. An electric power steering device with improved versatility can be provided.

It is a perspective view of the rotary electric machine which is a component of the electric power steering apparatus which concerns on Example 1 of this invention. It is a front view (output side) of the rotary electric machine shown in FIG. It is sectional drawing along the III-III line | wire shown in FIG. It is sectional drawing along the III-IV line shown in FIG. It is a rear view (case bottom side) of the rotary electric machine shown in FIG. It is a disassembled perspective view of the rotary electric machine shown in FIG. It is a perspective view which shows the assembly middle of the rotary electric machine shown in FIG. FIG. 2 is a front view (output side) of the rotating electrical machine shown in FIG. 1, and is a diagram showing the handling (through line) of the sensor harness. It is a partial cross section figure which shows the state which attached the rotary electric machine which concerns on Example 1 of this invention to the reduction gear. It is sectional drawing corresponding to FIG. 3 of the rotary electric machine which concerns on the other Example of this invention. It is a front view (output side) of the rotary electric machine which is a component of the electric power steering apparatus which concerns on Example 2 of this invention. It is sectional drawing along the XII-XII line | wire shown in FIG. It is a partial cross section figure which shows the state which attached the rotary electric machine which concerns on Example 2 of this invention to the reduction gear. It is a front view (output side) of the rotary electric machine which is a component of the electric power steering apparatus which concerns on Example 3 of this invention. It is sectional drawing along the XV-XV line | wire shown in FIG. It is a front view (output side) of the conventional rotary electric machine, Comprising: It is a figure which shows the handling (connection) of a sensor harness. It is a partial cross section figure which shows the state which attached the rotary electric machine which is a component of the electric power steering apparatus of this invention to the reduction gear which concerns on another Example. It is a side view which decomposes | disassembles and shows a part of electric power steering apparatus which concerns on Example 4 of this invention. It is a side view which shows the state which assembled the electric power steering device shown in FIG. FIG. 20 is a front view (output side) of the electric power steering apparatus shown in FIG. 19. FIG. 20 is a rear view (case bottom view) of the electric power steering device shown in FIG. 19. It is sectional drawing which made the part along the XXII-XXII line shown in FIG. 20 into a cross section. It is a partial cross section figure which shows the state which attached the electric power steering device which concerns on Example 4 of this invention to the reduction gear. It is a side view which shows the electric power steering apparatus which concerns on the other Example of this invention. It is a front view (output side) of the electric power steering apparatus which concerns on the other Example of this invention.

  Next, an electric power steering apparatus according to an embodiment of the present invention will be described with reference to the drawings. In addition, the Example described below is the illustration for demonstrating this invention, and this invention is not limited only to these Examples. Therefore, the present invention can be implemented in various forms without departing from the gist thereof.

  1 is a perspective view of a rotating electrical machine that is a component of an electric power steering apparatus according to Embodiment 1 of the present invention, FIG. 2 is a front view (output side) of the rotating electrical machine shown in FIG. 1, and FIG. 4 is a cross-sectional view taken along line III-III shown in FIG. 2, FIG. 4 is a cross-sectional view taken along line III-IV shown in FIG. 2, and FIG. 5 is a rear view of the rotating electrical machine shown in FIG. 6 is an exploded perspective view of the rotating electrical machine shown in FIG. 1, FIG. 7 is a perspective view showing the assembly of the rotating electrical machine shown in FIG. 1, and FIG. 8 is a front view (output side) of the rotating electrical machine shown in FIG. FIG. 9 is a partial cross-sectional view showing a state in which the rotating electrical machine shown in FIG. 1 is attached to the speed reducer. In the drawings, for easy understanding, the thickness, size, enlargement / reduction ratio, etc. of each member are not matched with the actual ones.

  As shown in FIGS. 1 to 9, the electric power steering apparatus according to the first embodiment includes a rotating electrical machine 1, and the rotating electrical machine 1 includes a bottomed cylindrical case 10 and an opening side of the case 10. And a bracket portion 50 disposed on the surface.

  A flange 17 is formed on an end surface of the opening side of the case 10 (hereinafter, this side is also referred to as “output side”). At a position 180 degrees apart from each other (positions facing each other) of the flange 17, a flange 10 and a resolver holder 52, which are constituent elements of the bracket 10, which will be described in detail later, are detachably fixed. The fixing portions 18 </ b> A and 18 </ b> B are formed to extend outward in the radial direction of the case 10. The fixing portions 18A and 18B are respectively formed with screw holes 19A and 19B through which a screw 91 for detachably fixing the case 10, the flange portion 51, and the resolver holder 52 is passed.

  A cylindrical stator 11 is attached to the inner peripheral surface of the case 10. The stator 11 has a configuration in which the coil 12 is wound after the stator core 16 is inserted inside the insulator 13, and is energized alternately to the N pole and the S pole by energization. In the case of a three-phase motor, 3n (where n is a positive integer) stator core is integrated by press-fitting or welding for each yoke part (back yoke part), or a stator core that is not integrated is used as a case. You may press fit into. In Example 1, the stator core is integrated in order to improve workability and ensure rigidity.

  A terminal block 25 is provided on the opening side of the case 10 (hereinafter, this side is also referred to as “output side”) of the stator 11, and the bus bar inserted into or inserted into the terminal block 25 and each phase coil are It is electrically connected by fusing or resistance welding. The stator 11 may be fixed to the case 10 by press-fitting, bonding, shrink fitting or the like, or may be floated so as not to contact the case 10.

  A rotor 15 disposed coaxially with the stator 11 is accommodated inside the stator core 16. The rotor 15 includes a rotor core (not shown), a magnet (not shown) disposed on the outer periphery of the rotor core, and a rotor cover (not shown). A rotor shaft 20 passes through the shaft core of the rotor 15, and the rotor shaft 20 extends from both ends of the rotor 15 in the axial direction. The power harness 26 that is electrically connected to the stator core 16 passes through a hole formed in the grommet 27 and is drawn out of the rotating electrical machine 1. The grommet 27 is inserted into a grommet insertion hole 29 formed at the opening side end portion of the case 10 and is sandwiched between the flange portion 51 and the resolver holder 52 to be prevented from coming off. The power harness 26 may be a bus bar terminal.

  The rotor shaft 20 can be press-fitted into the rotor core or can be integrally formed with the rotor core. As the magnet, 2n segment magnets (where n is a positive integer) may be provided, or a ring magnet may be provided. Moreover, you may use the embedded magnet type which arrange | positions a magnet inside a 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 disposed by press-fitting from the axial direction of the rotor, shrink fitting, adhesion, or the like. .

  Of the rotor shaft 20, an end 20B (hereinafter referred to as a rear side end 20B) extending toward the bottom 10B of the case 10 is accommodated in a small-diameter cylindrical recess 14 formed in the bottom 10B. An inner ring 22 of a ball bearing (rolling bearing) 21 as a bearing is fitted into the front end of the rear side end 20B by press fitting, and the outer ring 23 of the ball bearing 21 is fixed to the inner wall of the cylindrical recess 14. Has been. Reference numeral 24 denotes a ball as a rolling element.

  A resolver holder, which is a constituent element of the bracket portion 50 described in detail later, is provided at an end portion 20F (output side; hereinafter referred to as an output side end portion 20F) of the rotor shaft 20 that extends toward the opening side of the case 10. An inner ring 62 of a ball bearing 61 disposed in 52 is fitted by press-fitting, and a resolver rotor 71 is fitted by press-fitting further to the output side of the output side end 20F. On the outer peripheral side of the resolver rotor 71, a resolver stator 72 disposed in the resolver holder 52 is positioned along the outer peripheral surface of the resolver rotor 71 with a predetermined interval. Further, the output-side tip of the output-side end portion 20F extends to a boss portion 90 that is connected to a reduction gear 100, which will be described in detail later. The rotor shaft 20 may be connected to the speed reducer 100 with a spline structure, or may be connected via an elastic coupling. Reference numeral 63 denotes an outer ring of the ball bearing 61, and reference numeral 64 denotes a ball as a rolling element.

  In addition to the configuration in which the ball bearings 21 and 61 are fixed to the rotor shaft 20 by press-fitting, the ball bearing 21 is fixed to the cylindrical recess 14 formed in the bottom 10B of the case 10 by press-fitting or the like, and the outer peripheral surface of the rotor shaft 20 A gap may be formed between the ball bearing 21 and the inner peripheral surface of the inner ring 22 of the ball bearing 21. The ball bearing 61 is fixed to a cylindrical recess 74, which will be described in detail after the resolver holder 52, by press-fitting or the like. A gap may be formed between the outer peripheral surface of the inner ring 62 and the inner peripheral surface of the inner ring 62 of the ball bearing 61.

  The bracket part 50 is disposed on the output side of the outer peripheral surface of the case 10, is disposed on the output side (opening side) of the case 10, the flange part 51 for attaching the case 10 to the speed reducer 100, and opens the case And a resolver holder 52 that supports the resolver stator 72 and the ball bearing 61.

  The flange portion 51 has a ring shape in which a case insertion hole 55 having an inner diameter slightly larger than the outer diameter of the case 10 is formed at the center thereof. The case 10 has a bottom portion 10B in the case insertion hole 55. Inserted from the side. The flange portions 51 are formed in the case 10 when the case 10 is inserted into the case insertion hole 55 and the flange portion 51 is disposed in the case 10 at positions 180 degrees apart from each other (positions facing each other). Screw holes 59A and 59B are formed so as to overlap and communicate with the screw holes 19A and 19B. A screw 91 for fixing the flange portion 51 to the fixing portions 18A and 18B of the case 10 is inserted into the screw holes 59A and 59B.

  The flange portion 51 is inserted into the case insertion hole 55 until the flange 17 of the case 10 contacts the flange portion 51, and the screw hole 19A and the screw hole 59A are communicated with each other. By attaching the holes 59B to each other and screwing the screws 91 into the respective screw holes, the holes 59B are attached to the case 10. Therefore, since the flange portion 51 is attached to the case 10 in a state of being overlapped with the case 10, the axial length of the rotating electrical machine 1 can be shortened by the length in the axial direction in which both the flange portions 51 are overlapped. . As a result, the rotating electrical machine 1 can be reduced in size and weight, the mounting property on a vehicle or the like can be improved, and the manufacturing cost can be reduced.

  Further, the bracket portion 50 is separated into a flange portion 51 and a resolver holder 52, and the flange portion 51 has a function for attaching the rotating electrical machine 1 to the speed reducer 100 and a state in which the case 10 is inserted into the case insertion hole 55. Therefore, since it is only necessary to have a function of being detachably fixed to the case 10, the shape of the flange portion 51 can be simplified, and the axial length of the flange portion 51 is shortened (the thickness is reduced). )can do. Therefore, the flange portion 51 can be reduced in size and weight. In addition, since the flange portion 51 and the resolver holder 52 are separated, and the flange portion 51, the case 10, and the resolver holder 52 are configured to be detachable by screws 91, either the flange portion 51 or the resolver holder 52 is configured. If one shape is changed, the layout of the vehicle can be dealt with, and the change cost can be reduced as compared with the case where the shape of the entire bracket portion 50 is changed. Moreover, since the flange portion 51, the case 10, and the resolver holder 52 are fastened together by two screws 91, the number of screws can be reduced as compared with a conventional rotating electrical machine.

  Further, in the vicinity of the screw holes 59A and 59B of the flange portion 51, attachment portions 56A and 56B for attaching the rotating electrical machine 1 to a reduction gear 100, which will be described in detail later, are formed extending outward in the radial direction of the flange portion 51. In addition, screw holes 57A and 57B through which screws 101 (see FIG. 9) for attaching the rotating electrical machine 1 to the reduction gear 100 pass are formed in the attachment portions 56A and 56B, respectively. Further, a cutout portion 54 for pulling out the power harness 26 to the outside of the rotating electrical machine 1 is formed on the side surface of the flange portion 51.

  The resolver holder 52 has a substantially disk shape that covers the opening of the case 10, and is formed in a concave shape toward the output side at the center of the surface that becomes the bottom 10 </ b> B side when disposed in the case 10. A cylindrical recess 74 into which the bearing 61 is press-fitted is formed. Further, on the side opposite to the cylindrical concave portion 74 of the resolver holder 52, a concave portion 75 is formed which is formed in a concave shape toward the bottom portion 10B side and in which the resolver stator 72 is accommodated. A cylindrical side wall 77 that protrudes from the output-side surface of the resolver holder 52 and defines an arrangement recess 75 has an outlet for pulling out the sensor harness 80 electrically connected to the resolver stator 72 to the outside. A notch 76 is formed. Reference numeral 81 denotes a protective tube that protects the sensor harness 80.

  The resolver stator 72 is fixed to the arrangement recess 75 by press-fitting, caulking, adhesion, or the like. The resolver stator 72 may be fixed either before or after the resolver holder 52 is disposed on the case 10. In the first embodiment, the resolver holder 52 is formed by drawing a thin plate. However, for example, as shown in FIG. 10, the resolver holder 52 may be formed by aluminum die casting using a die-cast alloy (ADC12) or the like. Moreover, if strength can be ensured, it may be formed of a resin. In this case, further weight reduction can be achieved.

  Further, extending portions 68A and 68B extending outward in the radial direction of the resolver holder 52 are formed on the output side of the outer periphery of the resolver holder 52 and at positions 180 degrees apart from each other (positions facing each other). Has been. These extending portions 68A and 68B have screw holes 69A and 69B that overlap and communicate with the screw holes 19A and 19B formed in the case 10 when the resolver holder 52 is disposed in the case 10. Each is formed. These screw holes 69 </ b> A and 69 </ b> B are formed from long holes in the circumferential direction, and a screw 91 for fixing the resolver holder 52 to the case 10 is inserted therein. Further, a cutout portion 64 for drawing the power harness 26 to the outside of the rotating electrical machine 1 is formed on the side surface of the resolver holder 52.

  In the rotating electrical machine 1 according to the first embodiment, the case 10 is inserted into the case insertion hole 55 of the flange portion 51, and the flange portion 51, the fixing portion 18A (18B) of the case 10 and the extending portion 68A of the resolver holder 52 ( 68B) and the screw holes 59A (59B), 19A (19B) and 69A (69B) are communicated with each other in a state where the flange 17 of the case 10 is sandwiched between the flange portion 51 and the resolver holder 52. The screws 91 are inserted into the respective screw holes, screwed together, and assembled together. At this time, since the screw holes 69A and 69B are long holes in the circumferential direction, the flange portion 51, the case 10, and the resolver holder 52 are temporarily fixed by the screws 91, and then the resolver holder 52 is moved in the circumferential direction. Can be rotated. Therefore, the position adjustment of the resolver rotor 71 in the circumferential direction can be easily performed. In addition, after adjusting the position of the induced voltage generated by rotating the resolver rotor 71 and the sensor signal from the resolver stator 72, the screw 91 is tightened with a predetermined torque to constitute the rotating electrical machine 1.

  Moreover, since the rotary electric machine 1 which concerns on Example 1 can draw out the sensor harness 80 from the side surface of the resolver holder 52, it is 360 degrees arbitrary directions (arbitrary radial directions) centering on the axial center of the rotary electric machine 1. FIG. Since the sensor harness 80 can be pulled out, the sensor harness 80 can be easily routed as shown in FIG. 8, and the overall length of the sensor harness 80 can be shortened compared to the conventional rotating electric machine 200 shown in FIG. Can do. In the conventional rotating electric machine 200 shown in FIG. 16, the bracket portion 210 has a configuration in which a flange portion and a resolver holder are integrally formed.

  As shown in FIG. 9, the speed reducer 100 to which the rotating electrical machine 1 having this configuration is attached includes a worm wheel 112 attached to the steering output shaft 111 and a worm 113 that meshes with the outer peripheral gear of the worm wheel 112. Yes. The worm 113 is supported by two bearings 115 and 116 fixed to the housing 114. One end of the worm 113 is coaxially coupled to the rotor shaft 20 of the rotating electrical machine 1 by a spline structure. Further, the rotating electrical machine mounting portion 102 of the housing 114 is formed with a screw hole 103 into which the screw 101 inserted into the screw holes 57A and 57B formed in the mounting portions 56A and 56B of the flange portion 51 is inserted. . The rotating electrical machine 1 is fixed to the speed reducer 100 by screwing the screw 101 into the screw hole 57A (57B) and the screw hole 103. At this time, the screw 91 that fixes the flange portion 51, the case 10, and the resolver holder 52 is positioned between the speed reducer 100 and the flange portion 51. Can be prevented from falling off unexpectedly. Therefore, it is not necessary to separately provide a mechanism for preventing the screw 91 from being detached, and the number of parts can be further reduced, and the weight and cost can be reduced.

  In addition, although Example 1 demonstrated the case where the flange part 51, the case 10, and the resolver holder 52 were fastened together with the two screws 91, not only this but the rotary electric machine 1 is the flange part 51, As long as it can be detachably attached to the case 10 and the resolver holder 52, it may be attached by other attachment means, and the number and location of the attachment means can be determined as desired. .

  Further, the flange portion 51 may be detachably attached to the control ECU of the rotating electrical machine 1 or may be integrated with the control ECU.

  Next, an electric power steering apparatus according to Embodiment 2 of the present invention will be described with reference to the drawings. In the second embodiment, members similar to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  11 is a front view (output side) of a rotating electrical machine that is a component of an electric power steering apparatus according to Embodiment 2 of the present invention, and FIG. 12 is a cross-sectional view taken along a line XII-XII shown in FIG. FIG. 13 is a partial cross-sectional view showing a state in which the rotating electrical machine according to the second embodiment of the present invention is attached to the speed reducer. In the drawings, for easy understanding, the thickness, size, enlargement / reduction ratio, etc. of each member are not matched with the actual ones.

  As shown in FIGS. 11 to 13, the electric power steering apparatus according to the second embodiment includes a rotating electrical machine 2, and the main points of the rotating electrical machine 2 that are different from the rotating electrical machine 1 according to the first embodiment are as follows. In the space defined by the inner wall 84 that defines the case insertion hole 55 of the flange portion 51, the output side end face 85 (open end face of the case 10) of the flange 17 of the case 10, and the outer peripheral face 86 of the resolver holder 152, The seal member 120 is provided.

  Compared with the resolver holder 52 according to the first embodiment, the resolver holder 152 according to the second embodiment has a configuration in which an end surface located on the outer peripheral side of the cylindrical side wall 177 that defines the disposition recess 75 protrudes toward the output side. Yes. That is, the difference in height between the end face on the output side of the side wall 177 and the end face located on the outer peripheral side of the side wall 177 of the resolver holder 152 is the difference between the end face on the output side of the side wall 77 of the resolver holder 52 and the resolver holder. The height difference from the end face located on the outer peripheral side of the side wall 77 of 52 is smaller. With this configuration, when the resolver holder 152 is attached to the case 10, the resolver holder 152 is disposed so as to protrude from the output side end face 85 of the case 10 to the output side with respect to the resolver holder 52. Therefore, in the rotating electrical machine 2 according to the second embodiment, the space defined by the inner wall 84 of the flange portion 51, the output side end surface 85 of the case 10, and the outer peripheral surface 86 of the resolver holder 152 is the rotation according to the first embodiment. It becomes deeper (larger) than the electric machine, and the seal member 120 can be reliably disposed in this space, and the inside of the case 10 is kept watertight by the seal member 120. When the rotating electrical machine 2 is attached to the speed reducer 100, the seal member 120 is in close contact with the rotating electrical machine mounting portion 102 of the housing 114 of the speed reducer 100 as shown in FIG. In addition, as the sealing member 120, an O-ring etc. are mentioned, for example.

  As described above, the seal member 120 can seal between the inner wall 84 of the flange portion 51 and the output side end surface 85 of the case 10, and between the output side end surface 85 and the outer peripheral surface 86 of the resolver holder 152. Since the inside of the case 10 can be reliably kept watertight, the number of parts can be reduced, and the assembly process and structure can be simplified.

  Next, an electric power steering apparatus according to Embodiment 3 of the present invention will be described with reference to the drawings. In the third embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  14 is a front view (output side) of a rotating electrical machine that is a component of an electric power steering apparatus according to Embodiment 3 of the present invention, and FIG. 15 is a cross-sectional view taken along line XV-XV shown in FIG. . In the drawings, for easy understanding, the thickness, size, enlargement / reduction ratio, etc. of each member are not matched with the actual ones.

  As shown in FIGS. 14 and 15, the electric power steering apparatus according to the third embodiment includes a rotating electrical machine 3, and the main points of the rotating electrical machine 3 that are different from the rotating electrical machine 1 according to the first embodiment are as follows. The arrangement position of the ball bearing 61 and the arrangement position of the resolver rotor 71 and the resolver stator 72.

  That is, in the rotating electrical machine 3, the resolver rotor 71 and the resolver stator 72 are accommodated in the cylindrical concave portion 74 formed in the resolver holder 52, and the rotor 15 at the output side end 20 </ b> F is in the immediate vicinity (rotation). The resolver rotor 71 is fitted by press-fitting at a position where the ball bearing 61 is disposed in the electric machine 1. A resolver stator 72 fixed to the inner wall of the cylindrical recess 74 is positioned along the outer peripheral surface of the resolver rotor 71 at a predetermined interval on the outer peripheral side of the resolver rotor 71. In the rotating electrical machine 3, the inner ring 62 of the ball bearing 61 accommodated in the disposition recess 75 is fitted into the output side of the output side end 20 </ b> F of the rotor shaft 20 by press fitting. The outer ring 63 of the ball bearing 61 is fixed to the inner wall of the arrangement recess 75.

  In the third embodiment, the resolver rotor 71 and the resolver stator 72 are accommodated in the cylindrical recess 74, and the ball bearing 61 is disposed in the disposition recess 75. It is formed larger than the inner diameter of the recess 75. The cylindrical recess 74 is formed with a notch 176 that serves as an outlet for pulling out the sensor harness 80 to the outside.

  As with the rotating electrical machine 1, the rotating electrical machine 3 can also have a shorter overall axial length compared to the conventional rotating electrical machine with the same output, and can be reduced in size and weight, and can be mounted on a vehicle or the like. As well as improving the versatility of the vehicle layout.

  Moreover, the rotary electric machine which concerns on this invention can also be attached to the reduction gear 100 provided with the structure shown in FIG. 17, for example. The speed reducer 100 shown in FIG. 17 has a screw on a surface facing the rotary electric machine 1 of the rotary electric machine mounting portion 102 (in FIG. 17, the rotary electric machine 1 is described, but the same applies to the rotary electric machines 2 and 3). A recess 118 capable of storing 91 is formed. Accordingly, the rotating electrical machine 1 (2 and 3) is attached to the speed reducer 100 in a state where the screw 91 is accommodated in the recess 118, as shown in FIG. Note that when the rotating electrical machine 1 (2 and 3) is attached to the speed reducer 100 having the configuration shown in FIG. 17, the rotating electrical machine 1 (2 and 3) is more than when it is attached to the speed reducer 100 having the configuration shown in FIG. It can be moved to the speed reducer 100 side, and the gap formed between the speed reducer 100 and the rotating electrical machine 1 (2 and 3) shown in FIG. 9 can be eliminated. For this reason, the length by which the rotating electrical machine 1 (2 and 3) protrudes in the axial direction with respect to the reduction gear 100 can be further shortened.

  Next, an electric power steering apparatus according to Embodiment 4 of the present invention will be described with reference to the drawings. In the fourth embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  18 is an exploded side view showing a part of the electric power steering apparatus according to Embodiment 4 of the present invention, FIG. 19 is a side view showing a state where the electric power steering apparatus shown in FIG. 18 is assembled, and FIG. 19 is a front view (output side) of the electric power steering device shown in FIG. 19, FIG. 21 is a rear view (case bottom view) of the electric power steering device shown in FIG. 19, and FIG. 22 is XXII-XXII shown in FIG. It is sectional drawing along a line. In the drawings, for easy understanding, the thickness, size, enlargement / reduction ratio, etc. of each member are not matched with the actual ones.

  As shown in FIGS. 18 to 22, the main difference between the electric power steering device according to the fourth embodiment and the electric power steering device according to the first embodiment is that the rotating electric machine 1 is connected to the flange portion 51 of the bracket portion 50. The case 151 of the ECU 150 that controls the driving of the ECU 150 is integrally formed.

  That is, the bracket portion 250 of the electric power steering apparatus according to the fourth embodiment is disposed on the output side of the outer peripheral surface of the case 10, the flange portion 251 for attaching the case 10 to the speed reducer 100, and the output side of the case 10. A resolver holder 52 that is disposed on the (opening side), covers the opening of the case and supports the resolver stator 72 and the ball bearing 61, and is integrally formed with the flange portion 251 and controls the driving of the rotating electrical machine 1 inside. And a housing 151 that houses the control device 152.

  The flange portion 251 continuously protrudes from one side on the basis of the diameter of the ring-shaped portion 251A and the ring-shaped portion 251A having a substantially ring shape similar to the flange portion 51, and is integrally formed with the housing 151. And a body connecting portion 251B. The ring-shaped portion 251A has a case insertion hole 55 formed at the center thereof, and the case 10 is inserted into the case insertion hole 55 from the bottom 10B side. Screw holes 59A and 59B similar to those of the flange portion 51 are formed at positions opposite to each other of the flange portion 251. In the vicinity of these screw holes 59A and 59B, the attachment portions 56A and 56B similar to the flange portion 51 are formed. 56B is formed. The attachment portions 56A and 56B are disposed at positions 180 degrees apart from each other (that is, on the diameter) of the ring-shaped portion 251A, and the housing connection portion 251B has a diameter connecting the attachment portion 56A and the attachment portion 56B. It protrudes to one side (that is, the side on which the housing 151 is disposed).

  As with the flange portion 51, the flange portion 251 is inserted into the case insertion hole 55 until the flange 17 of the case 10 abuts against the flange portion 251, and the screw hole 19A and the screw hole 59A are communicated. Further, the screw hole 19B and the screw hole 59B are made to communicate with each other, and the screw 91 is screwed into each screw hole, thereby being attached to the case 10. Therefore, since the flange portion 251 is attached to the case 10 in a state of being overlapped with the case 10, the axial length of the rotating electrical machine 1 can be shortened by the length in the axial direction in which both are overlapped. . As a result, it is possible to reduce the size and weight of the electric power steering apparatus, improve the mounting property on a vehicle or the like, and reduce the manufacturing cost.

  In addition, the flange portion 251 and the housing 151 may be integrally formed, or the flange portion 251 and the housing 151 are formed as separate bodies, and then are integrally welded or bonded together. It may be formed. Reference numerals 153 and 154 denote connector housings.

  Further, the bracket portion 250 is separated into a flange portion 251 and a resolver holder 52, and the flange portion 251 inserts the case 10 into the case insertion hole 55 and a function for attaching the electric power steering device to the reduction gear 100. In this state, since it has a function of being detachably fixed to the case 10, the shape of the electric power steering device can be simplified. Further, since the flange portion 251, the case 10, and the resolver holder 52 are configured to be detachable by the screw 91, if one of the flange portion 251 and the resolver holder 52 is changed, it corresponds to the layout of the vehicle. Therefore, the change cost can be reduced as compared with the case where the overall shape of the bracket portion 250 is changed. Further, since the flange portion 251, the case 10, and the resolver holder 52 are fastened together by two screws 91, the number of screws can be reduced as compared with a conventional rotating electrical machine.

  The resolver holder 52 is the same as that of the first embodiment, but a bus bar terminal 226 is provided instead of the power harness 26, and the bus bar terminal 226 is fixed to the terminal block 125 of the ECU 150 with screws 230. Thus, the terminal block 25 and the terminal block 125 are electrically connected by the bus bar terminal 226. The sensor harness 80 is protected by a protective tube 81 and is electrically connected to the ECU 150 via the connector 155.

  In the electric power steering apparatus according to the fourth embodiment, the case 10 is inserted into the case insertion hole 55 of the flange portion 251, and the flange portion 251, the fixing portion 18 </ b> A (18 </ b> B) of the case 10, and the extending portion 68 </ b> A of the resolver holder 52. (68B) are superposed, and the screw holes 59A (59B), 19A (19B) and 69A (69B) are communicated with each other in a state where the flange 17 of the case 10 is sandwiched between the flange portion 251 and the resolver holder 52. The screw 91 is inserted into each screw hole, screwed together, and assembled together. Therefore, the connection between the rotating electrical machine 1 and the ECU 150 can be realized with a simple structure. At this time, since the screw holes 69A and 69B are long holes in the circumferential direction, the flange portion 251, the case 10, and the resolver holder 52 are temporarily fixed by the screws 91, and then the resolver holder 52 is rotated. Can be rotated in the direction. Therefore, the position adjustment in the circumferential direction of the resolver rotor 71 can be easily performed, and the screw 91 is defined after the position adjustment between the induced voltage generated by rotating the resolver rotor 71 and the sensor signal from the resolver stator 72. The electric power steering device can be configured by tightening with the torque of.

  Further, the electric power steering apparatus according to the fourth embodiment is fixed to the speed reducer 100 by screwing the screw 101 into the screw hole 57A (57B) and the screw hole 103 as shown in FIG. At this time, similarly to the electric power steering apparatus according to the first embodiment, the screw 91 fixing the flange portion 251, the case 10, and the resolver holder 52 is positioned between the speed reducer 100 and the flange portion 251. Therefore, it is possible to prevent the screw 91 from unexpectedly falling off by the speed reducer 100 and the flange portion 251. Therefore, it is not necessary to separately provide a mechanism for preventing the screw 91 from being detached, and the number of parts can be further reduced, and the weight and cost can be reduced.

  In the fourth embodiment, the case where the sensor and the ECU 150 are electrically connected via the sensor harness 80 has been described. However, the present invention is not limited to this, and the sensor and the ECU 150 may be electrically connected by welding or the like. . Further, the sensor harness 80 may be connected inside the ECU 150 or inside the rotating electrical machine 1, or the sensor harness 80 may be pulled out and connected.

  In the fourth embodiment, the case where the bus bar terminal 226 and the terminal block 125 are electrically connected by the screw 230 has been described. However, the present invention is not limited thereto, and the bus bar terminal 226 and the terminal block 125 are electrically connected by welding or the like. May be.

  Further, as shown in FIGS. 24 and 25, a heat sink portion 260 made of a heat radiating rib may be formed on the outer peripheral surface of the flange portion 251 (the outer peripheral surface of the ring-shaped portion 251A). Thus, by forming the heat sink portion 260 on the outer peripheral surface of the flange portion 251, the heat dissipation can be improved without increasing the axial length of the electric power steering device.

  DESCRIPTION OF SYMBOLS 1, 2, 3 ... Rotating electric machine, 10 ... Case, 11 ... Stator, 12 ... Coil, 15 ... Rotor, 16 ... Stator core, 18A, 18B ... Fixed part, 19A, 19B, 57A, 57B, 59A, 59B, 69A, 69B ... Screw hole, 20 ... Rotor shaft, 50 ... Bracket part, 51, 251 ... Flange part, 52 ... Resolver holder, 56A, 56B ... Mounting part, 71 ... Resolver rotor, 72, 172 ... Resolver stator, 80 ... Sensor harness 91 ... Screw, 100 ... Reducer, 120 ... Sealing member, 150 ... ECU, 151 ... Housing, 226 ... Busbar terminal

Claims (10)

A bottomed cylindrical case that houses the rotor and the stator, and a bracket portion that is disposed on the opening side of the case and supports the output side end portion of the shaft of the rotor, and can be attached to an object An electric power steering device equipped with a rotating electric machine,
The bracket portion is
The case has a case insertion hole that is inserted from the bottom side of the case, and a mounting portion that is attached to the object, and a flange portion that is disposed in the case inserted into the case insertion hole;
A resolver holder that supports the resolver stator and supports the shaft that supports the output side end of the shaft, and that is disposed on the opening side of the case and covers the opening of the case;
With
The electric power steering apparatus, wherein the case includes a fixing portion that is sandwiched between the resolver holder and the flange portion and to which the resolver holder and the flange portion are detachably fixed.   The electric power steering apparatus according to claim 1, further comprising an electronic control unit that controls driving of the rotating electrical machine, wherein the flange portion and a housing of the electronic control unit are integrally formed.   The resolver holder, the fixing portion, and the flange portion are formed with screw holes that can communicate with each other, and the resolver holder, the fixing portion, and the flange portion are fastened together by screws inserted into the screw holes that are in communication with each other. The electric power steering apparatus according to claim 1 or 2.   The electric power steering apparatus according to claim 3, wherein the screw hole formed in the resolver holder is a long hole that is long in the circumferential direction.   The screw hole of the said flange part is formed in the vicinity of the said attaching part, The screw inserted in the said screw hole connected is located between the said target object and a flange part. Electric power steering device.   A seal member is disposed in a space defined by an inner wall that defines a case insertion hole of the flange portion, an opening end surface of the case, and an outer peripheral surface of the resolver holder, and the case is watertight by the seal member. The electric power steering device according to any one of claims 1 to 5, wherein the electric power steering device is held by the motor.   A resolver stator accommodating portion for accommodating the resolver stator is formed at a central portion of the resolver holder, and the resolver stator accommodating portion pulls out a sensor harness electrically connected to the resolver stator to the outside. The electric power steering apparatus according to any one of claims 1 to 6, further comprising an outlet.   The electric power steering apparatus according to claim 2, wherein the stator and the electronic control unit are connected via a bus bar terminal or a harness.   The electric power steering apparatus according to claim 2 or 8, wherein a heat sink is provided in a casing of the electronic control unit.   The electric power steering apparatus according to claim 9, wherein the heat sink part is disposed on the flange part.

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