JP2007202248A - Assembling method of rotating electric machine and assembling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a rotating electric machine reduced in vibration and noise and low in price. <P>SOLUTION: The rotating electric machine 10 comprises a first bearing 20 that is press-fit into a case 24 fixed to a housing 26, and a rotor 14 pivoted by a second bearing 22 that is press-fit into the housing 26. When assembling the rotating electric machine 10, the rotor 14 is preset by only a distance X1 and held by being pressed toward the direction of an arrow A1 with the housing 26 as a reference. The case 24 heated at a prescribed temperature is attached to the housing from the first bearing 20 side, and fixed to the housing 26 while pressing down the case 24 in the direction of an arrow A2. The case 24 is contracted in the radial direction, and shrink-fit and fixed to an outer ring 20a, and the outer ring 20a is displaced toward the direction of the arrow A2 by axially being contracted by an amount of Δt. The preset of the rotor 14 and the pressing of the case 24 are released. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine assembling method and an assembling apparatus having a second bearing press-fitted into a housing and a rotor pivotally supported by a first bearing press-fitted into a cylindrical case fixed to the housing.

  In many cases, the rotating shaft of a rotor in a rotating electrical machine is supported by a ball bearing or the like. By providing such a bearing, the rotating shaft can rotate smoothly.

  By the way, in the ball bearing unit, there are axial and radial rattles between the inner ring and the outer ring, and there are rattles between the inner ring and the rotor and between the outer ring and the case. May be a cause of For example, in a rotating electrical machine used for electric power steering, such vibration may be transmitted to the palm of the driver or a sound may be heard, and a rotating electrical machine with even lower vibration and noise is desired.

  From such a background, it has been proposed to adjust the preload on the ball and the outer ring by applying an axial preload to the inner ring of the bearing. For example, in the rotating electrical machine disclosed in Patent Document 1, an adjustment screw is screwed into the lower end of the rotor, and a pressing member is sandwiched between the adjustment screw and the inner ring. The pressing member presses the inner ring along the axial direction of the rotor and applies a preload to the ball bearing to adjust the screwing amount of the adjusting screw.

Japanese Patent Laid-Open No. 11-45501

  By the way, as in the rotating electrical machine shown in Patent Document 1 above, in order to adjust the axial clearance by applying a preload, it is assumed that the inner ring to which the preload is applied is movable. It is necessary to have some backlash. Such a gap becomes a radial clearance, and vibration and noise during rotation cannot be sufficiently reduced. It may be possible to eliminate rattling by adhering and fixing the inner ring and rotor after adjustment, but it is difficult to accurately fix it coaxially to the rotor, and the adhesive application process and adhesive drying process Is necessary and the procedure becomes complicated.

  In addition, since preload adjusting parts such as a preload spring are incorporated in the product as they are, the number of parts, weight, and cost are increased. In particular, since the preload adjusting component is fixed to the inner ring and the rotor, the rotational moment of the entire rotating body increases, and the acceleration / deceleration responsiveness decreases. Further, when the fixing with the adhesive is not performed, readjustment is necessary after the preload adjusting part is removed.

  Furthermore, in the rotating electric machine of Patent Document 1, the adjusting screw cannot be operated while the rotating body is being rotated, and it is necessary to repeat the adjustment at the time of stopping and the measurement at the time of rotation several times. Yes, it takes time.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an assembly method and an adjustment device for a rotating electrical machine capable of reducing vibration and noise and realizing an inexpensive rotating electrical machine. .

  A method of assembling a rotating electrical machine according to the present invention includes a first bearing press-fitted into a cylindrical case fixed to a housing, and a rotating electrical machine having a rotor supported by a second bearing press-fitted into the housing. A press-fitting step of press-fitting the inner ring of the second bearing and the inner ring of the first bearing into respective specified locations in the rotor, and press-fitting the outer ring of the second bearing into the housing; and A preset process for holding the rotor displaced by a predetermined distance by pressing the rotor toward the first bearing as a reference, and mounting the cylinder case heated to a predetermined temperature from the first bearing side, A mounting step of fixing the case to the housing while pressing the case in the axial direction, cooling the cylindrical case, and shrinking the cylindrical case in the radial direction A cooling step in which the outer ring of the first bearing is displaced by being shrink-fitted and fixed to the outer ring of the one bearing, and the outer ring of the first bearing is displaced toward the second bearing by contracting the cylindrical case in the axial direction; And holding the displacement and releasing the pressing of the case.

  Thus, the amount of deviation between the outer ring and the inner ring can be arbitrarily adjusted according to the preset displacement and the degree of temperature rise of the case.

  In this case, it is preferable to monitor the amount of contraction of the cylindrical case in the cooling step and release the holding of the displacement of the rotor when the amount of contraction reaches a specified value. Thereby, after the cylinder case is reliably cooled, the preset displacement is released and the bearing can be adjusted with high accuracy.

  If the amount of displacement in the preset step is set based on the amount of final shrinkage of the cylindrical case after the cooling step and the amount of axial displacement between the inner ring and the outer ring of the first bearing, the accuracy can be further increased. The bearing can be adjusted.

  The rotating electrical machine assembly apparatus according to the present invention includes a first bearing press-fitted into a cylindrical case fixed to the housing, and a rotor supported by the second bearing press-fitted into the housing. An assembly apparatus for a rotating electrical machine, wherein a housing holding portion that holds the housing, a first center pin that presses the rotor toward the first bearing to displace it by a predetermined distance, and the heated cylindrical case A case holding portion to hold, a case pressing portion that presses a mounting portion of the case holding portion with respect to the housing toward the housing side, a slide mechanism that slides the case holding portion in an axial direction, and the slide It has a 1st slide fixing | fixed part which makes the said case press part act by fixing a mechanism in a 1st fixing position, It is characterized by the above-mentioned.

  As a result, the amount of axial displacement between the outer ring and inner ring of the first bearing becomes the distance obtained by subtracting the amount of contraction movement of the case from the preset displacement, and the amount of deviation between the outer ring and the inner ring becomes the preset displacement or the temperature of the case increases. It is possible to adjust arbitrarily depending on the degree of.

  The assembly apparatus may include a rotation mechanism that vertically arranges the housing holding part and the case holding part and reverses the vertical direction. By lowering the housing holding portion, the housing can be easily held and fixed, and by lowering the case holding portion, the cylindrical case can be easily held and fixed.

  A second center pin that is provided on the case holding portion side and supports the shaft end of the rotor; a pin pressing portion that presses the second center pin; and the pin pressing means by fixing the slide mechanism at a second fixing position. The second fixed position may be set farther from the housing than the first fixed position, and may be set at a position where the case pressing part does not operate.

  As a result, the rotor can be centered, preset, etc. at the second fixed position, and the case can be pressed and fixed at the first fixed position.

  In the method of assembling the rotating electrical machine according to the present invention, the rotor is displaced by a predetermined distance in the preset process in advance, and then the outer ring of the first bearing is shrink-fitted in the cylindrical case, and the displacement in the preset process is caused by axial contraction The outer ring of the first bearing is displaced in the opposite direction. Further, by releasing the pressure in the preset step, the axial displacement between the outer ring and the inner ring of the first bearing becomes a distance obtained by subtracting the amount of contraction movement of the case from the preset displacement. Thus, the amount of deviation between the outer ring and the inner ring can be arbitrarily adjusted according to the preset displacement and the degree of temperature rise of the case. In addition, since the adjustment of the deviation amount is performed in the assembly process of the housing and the cylindrical case, a dedicated adjustment process and an adjustment device are unnecessary and can be performed easily and in a short time.

  Furthermore, the assembled rotating electrical machine does not have a jig for adjusting the deviation amount, and is simple, inexpensive and highly reliable.

  According to the rotating electrical machine assembly apparatus of the present invention, the heated cylindrical case can be held by the case holding portion and further pressed against the housing by the case pressing portion. The tube case can be accurately shrink-fitted and fixed. At this time, the rotor is displaced by a predetermined distance by the first center pin, so that the outer ring of the first bearing can be displaced in the direction opposite to the initial displacement when the cylindrical case is cooled thereafter. Therefore, when the first center pin is removed, the axial displacement between the outer ring and the inner ring of the first bearing is a distance obtained by subtracting the amount of contraction movement of the case from the preset displacement. As a result, the amount of deviation between the outer ring and the inner ring can be arbitrarily adjusted according to the preset displacement and the degree of temperature rise of the case.

  Embodiments of an assembly method and an adjustment device for a rotating electrical machine according to the present invention will be described below with reference to the accompanying FIGS. The assembling method according to the present embodiment is a method of assembling the rotating electrical machine 10 shown in FIG. 1, and the assembly adjusting device 100 (see FIG. 2) according to the present embodiment is an apparatus for adjusting the rotating electrical machine 10. First, the rotating electrical machine 10 will be described with reference to FIG. The rotating electrical machine 10 is used, for example, for an electric power steering of a vehicle and is connected to a handle shaft.

  As shown in FIG. 1, the rotating electrical machine 10 includes a stator 12, a rotor 14, a rotation sensor 18 that detects the rotational position of the rotor 14, a first bearing 20 that is a radial bearing of an angular ball that supports the rotor 14, and a first bearing 20. Two bearings 22, a cylindrical stepped case (cylinder case) 24 to which the stator 12 is fixed, and a housing 26 provided in the arrow A2 direction of the case 24 and provided with the rotation sensor 18 and the second bearing 22. And an end plug 28 for closing the end of the case 24 in the direction of arrow A1. The end plug 28 is provided with an O-ring 28a that provides a sealing action with the small diameter portion 24b.

  The case 24 is made of a metal plate (for example, a steel plate) having appropriate thermal expansion characteristics. An end portion of the case 24 in the direction of arrow A2 is provided with a flange 25 projecting outward by drawing. The flange 25 is provided with a plurality of screw holes 25a, and the case 24 is fixed to the housing 26 by screws 27 passing through the screw holes 25a.

  The first bearing 20 includes an outer ring 20a, an inner ring 20b, and a plurality of balls 20c, and the rotor 14 is pivotally supported by an end portion 14a in the arrow A1 direction. The second bearing 22 has an outer ring 22a, an inner ring 22b, and a plurality of balls 22c, and supports the rotor 14 in the vicinity of the end 14b in the arrow A2 direction.

  The case 24 has a large-diameter portion 24a into which the stator 12 is press-fitted, and a small-diameter portion 24b into which the first bearing 20 is press-fitted and provided with an end plug 28. The small diameter portion 24b has a diameter approximately half that of the large diameter portion 24a and is connected to the large diameter portion 24a via a step portion 24c. An annular groove 24d that is gently depressed in the axial direction is provided at the peripheral edge of the small diameter portion 24b in the stepped portion 24c.

  A bearing press-fit portion 24e to which the outer ring 20a of the first bearing 20 is fixed by shrink fitting is provided on the inner peripheral surface on the arrow A2 side in the small diameter portion 24b. In addition, since the fixing by shrink-fitting is almost the same fixed state as the press-fitted state, it is also referred to as “press-fitting” in the following description.

  The outer ring 22a of the second bearing 22 is press-fitted into the housing 26 in the direction of arrow A2. The inner ring 22 b of the second bearing 22 is press-fitted into the rotor 14, and the side surface in the direction of the arrow A 1 is in contact with the step portion 14 d of the rotor 14.

  A plurality of magnets 34 are attached to the rotor 14 between the first bearing 20 and the second bearing 22. The stator 12 is press-fitted into the inner peripheral portion of the case 24, and a narrow gap is formed in which magnetic force is transmitted to the magnet 34. Conductive wire ends of U, V, and W phase coils 36 provided on the stator 12 are connected to an external conductive wire 40 via a terminal block 38 of the housing 26. With such a configuration, the rotating electrical machine 10 rotates as a motor by energizing the external conducting wire 40 with a three-phase alternating current, and conversely, the rotating electrical machine 10 acts as a generator by rotating the rotor 14. At the end of the rotor 14, a connecting tool 42 with another rotating shaft (for example, a vehicle handle shaft) is provided. The housing 26 is provided with a plurality of bolt holes 26a for attachment. Further, small spindle-shaped central grooves 14e and 14f are provided in the center of the end surfaces of the rotor 14 in the arrow A1 direction and the arrow A2 direction.

  Next, an assembly adjustment apparatus 100 that performs adjustment to reduce vibration and noise of the rotating electrical machine 10 will be described with reference to FIGS.

  As shown in FIGS. 2 and 3, the assembly adjusting device 100 is provided to rotate on a vertical plane by a support column 102 extending upward from a pedestal 102 a and two bearings 104 provided on the support column 102. Adjustment mechanism 106.

  The adjustment mechanism unit 106 is provided with a central shaft 108 supported by the bearing 104, a turntable 110 connected to the central shaft and provided near the side surface of the support column 102, and one end on the turntable 110. It has a housing operation part 112, a case operation part 114 provided coaxially with the center line C of the housing operation part 112, and a lock mechanism 115 for positioning the angle of the turntable 110. Hereinafter, the direction on the turntable 110 is identified as the arrow A2 direction on the side where the housing operation unit 112 is provided, and the opposite side as the arrow A1 direction. This direction is specified to be the same as the direction of the rotating electrical machine 10 to be assembled (see FIG. 1).

  The housing operation unit 112 includes two brackets 117 protruding forward from the end of the turntable 110, a base plate 116 supported and fixed by these brackets 117, and a housing provided on the base plate 116. And a fixing jig 118. The housing fixing jig 118 is provided so that the arrow A2 direction of the housing 26 fits. The housing 26 is fixed to the base plate 116 by a clamp 122 provided through a base plate 116 and a through hole 119 provided coaxially in the housing 26. The clamp 122 includes a nut member 122a partially inserted into the through hole 119, and a bolt member 122b inserted into the through hole 119 from the arrow A2 side and screwed into the nut member 122a. The nut member 122a has an arm portion 122c slightly protruding in the radial direction, and the arm portion 122c presses the end portion of the housing 26 by rotating the knob portion 122d provided on the bolt member 122b, thereby fixing the housing 26. can do.

  A hole 118 a coaxial with the housing 26 is provided at the center of the housing fixing jig 118, and communicates with a hole 116 a provided in the base plate 116. A pressing mechanism 120 is provided in the hole 116a.

  The pressing mechanism 120 has a nut body 123 provided on the arrow A2 side of the hole 116a and a first center pin 124 screwed into the nut body 123. The first center pin 124 includes, in order from the arrow A1 direction toward the arrow A2 direction, a tapered portion 124a having a sharp tip, a pin main body portion 124b, a male screw portion 124c screwed into the nut body 123, and a knob portion 124d. Have.

  The taper portion 124a protrudes slightly in the direction of the arrow A1 from the base plate 116, contacts the end portion 14b of the rotor 14 after the rotor 14 is press-fitted into the housing 26, and the tip end portion is inserted into the central groove 14f. . The knob portion 124d protrudes in the direction of the arrow A2 from the nut body 123, and can be rotated by a human hand or predetermined rotating means. By rotating the knob portion 124d, the tapered portion 124a advances in the axial direction, and the rotor 14 can be displaced.

  The case operation unit 114 includes a main rail 140 that extends from the vicinity of the housing operation unit 112 to the vicinity of the end in the direction of arrow A1 on the turntable 110, a main elevating body 142 that slides while being guided by the main rail 140, A sub rail 144 provided on the main elevating body 142 in a direction parallel to the main rail 140, a sub elevating body 146 guided and slid by the sub rail 144, and a case holding portion 148 connected to the sub elevating body 146. And a positioning engagement plate 150 provided on the turntable 110.

  The main elevating body 142 includes four engaging legs 152 that are slidably engaged with the main rail 140, a plate 154 that is held by each engaging leg 152, and a spring receiving piece that protrudes forward from the end in the arrow A1 direction. 156, a swing lever 158 projecting sideways from the end in the direction of arrow A2, and a displacement gauge (or sensor) 159 provided on the spring receiving piece 156. The swing lever 158 can be selectively engaged with the first notch (first slide fixing portion) 150a or the second notch (second slide fixing portion) 150b of the positioning engagement plate 150 by a swing operation. Positioning in the direction of arrow A is performed. The second notch 150b is provided closer to the arrow A1 direction than the first notch 150a. The displacement gauge 159 is a sensor that measures the amount of displacement of the second center pin 190 with respect to the main elevating body 142, and measures it through a limit bar 192 described later. A sub rail 144 is provided on the plate 154.

  The main elevating body 142 is prevented from coming off from the main rail 140 by a stopper 110a protruding forward from the end of the turntable 110 in the arrow A1 direction. As is apparent from FIG. 2, the slidable distance L1 of the main elevating body 142 is larger than the length H of the case 24 (see FIG. 1).

  The sub elevating body 146 protrudes in the direction of the arrow A1 from the four engagement legs 160 slidably engaged with the sub rail 144, the small plates 157 held by the respective engagement legs 160, and the ends of the small plates 157. And two bars 162 that are loosely fitted in the two holes 156a of the spring receiving piece 156, and springs (case pressing portions) 164 that are fitted in the respective bars 162. In the initial state (the state shown in FIG. 2), each spring 164 is in an uncompressed state, and the sub elevating body 146 receives neither pressing force nor tensile force from the spring 164. As will be described later, when the rotary electric machine 10 is assembled, when the main elevating body 142 is slid in the direction of the arrow A2 and the swing lever 158 is engaged with the first notch 150a, each spring 164 is compressed and the sub elevating body 146 is compressed. Is pressed with an appropriate force in the direction of arrow A2.

  The sub elevating body 146 is prevented from coming off from the sub rail 144 by a stopper 142a protruding forward from the end of the main elevating body 142 in the arrow A2 direction. As apparent from FIG. 2, the slidable distance L2 of the sub elevating body 146 is set shorter than the distance L1.

  As shown in FIG. 4, the case holding portion 148 is a portion that holds the case 24 so as to be coaxial with the central axis C of the case 24. The case holding portion 148 is configured based on a large-diameter case holding cylinder 170 in the direction of arrow A2 and a small-diameter weight portion (pin pressing portion) 172 in the direction of arrow A1. The weight portion 172 can be attached to and detached from the case holding cylinder 170, and can be replaced with one having an appropriate weight depending on the type of the case 24.

  The case holding cylinder 170 has a coaxial two-stage shape, and includes a small diameter portion 170a in the direction of arrow A1 and a large diameter portion 170b in the direction of arrow A2. The small diameter portion 170 a is fitted in a bottom hole 172 a provided at the end of the weight portion 172. The inner diameter of the large-diameter portion 170b is set to a diameter and depth at which the large-diameter portion 24a (see FIG. 1) of the case 24 can be inserted. The large diameter portion 170b is provided with an appropriate recess (not shown) so that a tool can be applied to the screw hole 25a (see FIG. 1) when the case 24 is held.

  The inner diameter of the small diameter portion 170a is set to a diameter that allows the small diameter portion 24b (see FIG. 1) of the case 24 to be inserted. At the end of the small diameter portion 170a, a hole 170c communicating with the lumen portion of the weight portion 172 is provided. The end surface of the small-diameter portion 170a extends in the direction of the bar 170d arrow A1 inserted into the vertical through hole 172b provided in the weight portion 172, and the weight portion 172 is stably held. A cover 172d having a central screw hole 172c is provided at the end of the weight portion 172 in the arrow A1 direction.

  The case holding portion 148 further includes two ring members 180 attached to the inner cavity portion of the large-diameter portion 170b, bolt clamps 182 provided on both side surfaces of the large-diameter portion 170b, and first press-fitted into the holes 170c. A first sleeve 184, a second sleeve 186 that is inserted into the lumen of the first sleeve 184 and can be moved forward and backward in the direction of arrow A, and the second sleeve 186 is elastically attached to the first sleeve 184 in the direction of arrow A2. A spring 188 to be biased, a second center pin 190 inserted into the inner cavity of the second sleeve 186 so as to be able to advance and retreat, and a limit bar 192 for restricting the movement of the second center pin 190 in the arrow A1 direction with a predetermined displacement. And a spring 187 provided between the lower surface of the limiting bar 192 and the bottom surface of the deep hole 190c. The spring 187 can transmit the load of the weight portion 172 to the second center pin 190 and can apply an appropriate load to the rotor 14 without impact.

  The ring member 180 is made of a material having a lower thermal conductivity than that of the case 24 and a coefficient of thermal expansion larger than that of the case 24. For example, nylon can be used. The ring member 180 is provided at two locations, the location on the opening side and the location on the deep side of the large diameter portion 170b. According to the ring member 180, when the heated case 24 is held, the remaining heat of the case 24 is hardly transmitted to the large diameter portion 170b, and the cooling rate of the case 24 can be suppressed. In addition, since the ring member 180 has a large coefficient of thermal expansion, the ring member 180 expands due to the heat of the case 24, and there is no gap between the ring member 180 and the large diameter portion 170b, and the ring member 180 is accurately positioned and held. Can do.

  The two bolt clamps 182 are provided on both side surfaces of the large-diameter portion 170b near the end in the arrow A2 direction, and include bolts 182a and knobs 182b. The bolt 182a is screwed into a screw portion 170e provided in the large diameter portion 170b and slightly protrudes into the lumen portion. The knob 182b is disposed outward from the large-diameter portion 170b. By rotating the knob 182b, the bolt 182a can be protruded toward the inner diameter direction of the large-diameter portion 170b, and the case mounted inside 24 can be held securely.

  The first sleeve 184 has a cylindrical shape including an upper part 184a fitted in the shaft hole 172e of the weight part 172 and a lower part 184b in the direction of the arrow A2 than that. The outer diameter of the lower portion 184b is set to be slightly larger than the outer diameter of the upper portion 184a so that the lower portion 184b does not fit into the shaft hole 172e. The inner diameter of the lower part 184b is set slightly larger than the inner diameter of the upper part 184a.

  Further, the first sleeve 184 includes an annular protrusion 184d provided on the side surface in the vicinity of the arrow A2 direction, and two stopper pins 184e that slightly protrude in the inner diameter direction from the left and right side surfaces of the annular protrusion 184d.

  The second sleeve 186 has a vertical slit 186a provided on both the left and right sides, and a small flange 186b provided at an end in the arrow A2 direction. The outer diameter of the second sleeve 186 is set to be fitted to the inner surface of the lower portion 184b of the first sleeve 184, and the inner diameter is substantially equal to the inner diameter of the upper portion 184a. A stopper pin 184e is inserted into the vertical slit 186a, and the second sleeve 186 is slidable in the direction of arrow A within a range until the stopper pin 184e contacts both ends of the vertical slit 186a.

  The outer diameter of the small flange 186 b is set to a diameter that abuts on the side surface of the outer ring 20 a of the first bearing 20. Further, a shallow recess 186c (see FIG. 14B) is provided on the end surface of the small flange 186b in the direction of arrow A2. Thereby, the small flange 186b contacts only the outer ring 20a and does not contact the inner ring 20b when pressed against the first bearing 20 as will be described later.

  A spring 188 is disposed between the annular protrusion 184d and the small flange 186b, and urges the second sleeve 186 in the arrow A2 direction.

  The second center pin 190 includes, in order from the arrow A2 direction toward the arrow A1 direction, a tapered portion 190a with a sharp tip and a pin main body portion 190b that fits into the second sleeve 186. The pin main body 190b is provided with a deep hole 190c having a bottom from the end in the arrow A1 direction to the arrow A2 direction, and a cap with hole 190d is fixed to the opening of the deep hole 190c.

  An end portion in the arrow A2 direction of the limiting bar 192 is inserted into the deep hole 190c, and a nut 192a is provided at the end portion. When the nut 192a contacts the cap with hole 190d, the second center pin 190 is prevented from coming off in the arrow A2 direction. Conversely, when the second center pin 190 is displaced in the direction of the arrow A1, the limiting bar 192 compresses the spring 187 and presses the bottom of the deep hole 190c.

  A threaded portion 192b is provided near the end of the limiting bar 192 in the arrow A1 direction, and is screwed into the central threaded hole 172c of the cover 172d. A knob 192c is provided at the end of the limit bar 192 in the direction of the arrow A1, and the advance amount of the limit bar 192 can be adjusted by rotating the knob 192c. A nut 192d is screwed into the threaded portion 192b, and after the advancement amount is adjusted, the limiting bar 192 can be securely fixed by the double nut action of the nut 192d and the central screw hole 172c. The position of the knob 192c is measured when the probe 159a of the displacement gauge 159 contacts.

  Returning to FIG. 2, the lock mechanism 115 includes a bearing 200 provided at the lower left portion of the column 102 in FIG. 2, a lever 202 that is swingably held by the bearing 200 and extends to the right in FIG. 2, A convex engagement piece 204 provided at a substantially central portion of the lever 202, a first hook 206 provided on the right side of the engagement piece, and a side surface of the support column 102 above the first hook 206. A second hook 208 is provided, and a spring 210 is provided between the first hook 206 and the second hook 208. The lever 202 is biased upward by the elastic action of the spring 210.

  On the back surface of the turntable 110, two concave engagement pieces 212a and 212b that engage with the engagement pieces 204 at intervals of 180 ° are provided. The engaged piece 212a is provided on the back surface of the turntable 110 at a position where the housing operation portion 112 is on the front surface. As shown in FIG. 2, when the engagement piece 204 is engaged with the engaged piece 212a, the orientation of the turntable 110 is fixed so that the housing operation portion 112 is downward and the case operation portion 114 is upward. Is done. At this time, the center line C, the main rail 140, and the like are vertical.

  When the lever 202 is pushed down, the engaging piece 204 is separated from the engaged piece 212a, and the turntable 110 can be rotated. When the lever 202 is returned to the original position by the force of the spring 210 when it is rotated 180 °. The engaging piece 204 is engaged with the engaged piece 212b, and the orientation of the turntable 110 is positioned and fixed. At this time, the housing operation part 112 is upward, the case operation part 114 is downward, and the arrow A1 direction and the arrow A2 direction are reversed (see FIG. 9).

  Next, a method for assembling and adjusting the rotating electrical machine 10 using the assembly adjusting apparatus 100 configured as described above will be described with reference to FIGS. 5 and 6. In the initial state, the turntable 110 is assumed to be locked in the direction shown in FIG. It is assumed that a magnet 34 is pre-assembled on the rotor 14 and a stator 12 is pre-assembled on the case 24.

  First, in step S1, the inner ring 20b of the first bearing 20 is press-fitted into one end portion 14a of the rotor 14, and the inner ring 22b of the second bearing 22 is press-fitted into the other end portion 14b. The first bearing 20 is securely press-fitted until the side surface of the inner ring 20b comes into contact with the step portion 14c, and the second bearing 22 is securely press-fitted until the side surface of the inner ring 22b comes into contact with the step portion 14d.

  In step S <b> 2, the outer ring 22 a of the second bearing 22 is press-fitted into the housing 26. A state in which the first bearing 20 and the second bearing 22 are press-fitted into the rotor 14 and the second bearing 22 is press-fitted into the housing is referred to as a temporary assembly 300 for convenience.

  In step S3, as shown in FIG. 7, the housing 26 of the temporary assembly 300 is placed on the housing fixing jig 118 of the housing operation unit 112 with the end 14a of the rotor 14 in the direction of the arrow A1, and the clamp 122 Use a temporary clamp to loosen. The temporary clamp at this time may be clamped so that the housing 26 does not float from the housing fixing jig 118. As is clear from FIG. 7, the temporary assembly 300 may be placed on the housing fixing jig 118 from above, and even when the operator releases his hand (or the predetermined placing means is separated). It is stable and the temporary clamping work is easy.

  At this time, the first center pin 124 is contracted in the direction of the arrow A2 and does not contact the rotor 14.

  In step S4, by operating the knob portion 124d, the first center pin 124 is advanced in the direction of the arrow A1, and the tapered portion 124a is inserted into the central groove 14f of the rotor 14 slightly so that the rotor 14 can be centered.

  In step S5, as shown in FIG. 8, the case holding cylinder 170 is moved in the direction of arrow A1, and the swing lever 158 is engaged with the second notch 150b for positioning. This position of the case holding cylinder 170 is referred to as a second fixed position. At this time, the rotor 14 is centered by inserting the tapered portion 190 a of the second center pin 190 into the center groove 14 e of the rotor 14. Further, when the main elevating body 142 of the case operation unit 114 is positioned at the second fixed position, the end of the limiting bar 192 contacts the bottom of the deep hole 190c via the spring 187, and the weight portion 172 has a weight of Two center pins 190 are applied to the rotor 14. As a result, only an appropriate weight (mainly the weight of the weight 172) is applied to the rotor 14 to stably hold it. Further, the load of the weight portion 172 is applied through the spring 187 without impact.

  At this time, the two springs 164 remain in an uncompressed state, and the elastic force of the springs 164 does not act on the case holding cylinder 170.

  In step S6, the clamp 122 is firmly tightened and fixed so that the housing 26 does not move. At this time, the rotor 14 is accurately centered, and the shaft of the rotor 14 is exactly aligned with the center line C of the assembly adjusting device 100 by fixing the housing 26.

  In step S7, by operating the knob portion 124d while confirming the display of the displacement gauge 159, the first center pin 124 is advanced in the arrow A1 direction, and preset adjustment is performed. That is, the rotor 14 is displaced in the arrow A1 direction by a predetermined displacement amount X1 μm (see FIG. 14A).

  In step S8, the lever 202 is pushed down to rotate 180 ° in the unlocked state of the turntable 110, and the lever 202 is returned to its original position and locked again as shown in FIG. Thereby, the arrow A1 direction is down and the arrow A2 direction is up.

  When the turntable 110 is rotated by 180 °, the rotor 14 receives a force in the direction of the arrow A1 due to its own weight, and the axial directions of the first bearing 20 and the second bearing 22 are slightly displaced according to the rotation. 14 is slightly separated from the first center pin 124. During this time, the position of the first center pin 124 is fixed.

  In step S9, as shown in FIG. 10, the swing lever 158 is pulled out from the second notch 150b, and the main lift 142 is lowered in the direction of the arrow A1.

  In step S10, the case 24 heated in advance to a predetermined temperature is inserted into the case holding cylinder 170 of the case holding portion 148 so that the large diameter portion 24a is on the arrow A2 side and the small diameter portion 24b is on the arrow A1 side, and the knob 182b is inserted. Hold and fix by rotating. Further, the ring member 180 expands due to the heat of the case 24, so that there is no gap between the large diameter portion 170 b and the case 24, and the case 24 is more reliably held. Further, since the case 24 contacts the large diameter portion 170b via the ring member 180 having a low heat transfer coefficient, heat transfer is suppressed and the case 24 is simply kept warm.

  At this time, as is clear from FIG. 10, the case 24 may be inserted into the case holding cylinder 170 from above, and is stable even when the operator releases the hand (or the predetermined placing means is separated). Therefore, the operation of the knob 182b is easy.

  Further, since the case 24 is heated to a predetermined temperature, the case 24 is thermally expanded as a whole, and both the radial direction and the axial direction are expanded. Therefore, the diameter of the bearing press-fit portion 24e is expanded to such an extent that the first bearing 20 can be inserted, and the axial length H of the large diameter portion 24a expands to H + Δh (see FIG. 13). Here, Δh is an expansion length due to heat, and Δh = Δt (rising temperature) × ε (thermal expansion coefficient) × H. The heating temperature of the case 24 is set as a value obtained by obtaining the upper temperature Δt based on the desired expansion length Δh and adding the rising temperature Δt to the room temperature.

  In step S11 of FIG. 6, the lever 202 is pushed down to rotate 180 ° in a state where the lock of the turntable 110 is released, the lever 202 is returned to the original state and locked again. As a result, the arrow A1 direction is up and the arrow A2 direction is down, returning to the same direction as in FIG. At this time, the rotor 14 again comes into contact with the tip of the first center pin 124 and is preset with respect to the first bearing 20 and the second bearing 22. The case 24 is held by the case holding cylinder 170 while being substantially maintained at a predetermined temperature.

  In step S12, as shown in FIG. 11, the main elevating body 142 of the case operation unit 114 is moved in the arrow A1 direction, and the swing lever 158 is engaged with the first notch 150a for positioning. This position of the case holding cylinder 170 is referred to as a first fixed position. In this first fixed position, the two springs 164 are compressed. That is, since the main elevating body 142 is displaced in the arrow A2 direction to a position close to the sub elevating body 146, the space between the upper end surface of the sub elevating body 146 and the spring receiving piece 156 is narrowed, and the two springs 164 are formed. The case holding cylinder 170 is compressed and pressed in the direction of arrow A2. This pressing force is received by the housing 26 via the flange 25. Therefore, the flange 25 is sandwiched between the case holding cylinder 170 and the housing 26.

  Separately from this, as in the case of the second fixed position, the weight of the weight portion 172 is added to the rotor 14 via the second center pin 190, and the rotor 14 is centered and positioned. Yes.

  The elastic force by the two springs 164 is a force considerably larger than the weight of the weight portion 172 (for example, about ten times), and the flange 25 of the held case 24 is strongly pressed against the housing 26 and fixed. Can do.

  As shown in FIG. 14B, the second sleeve 186 is pressed in the direction of the arrow A2 by the action of the spring 188, and the small flange 186b is provided with a shallow recess 186c. Presses only the outer ring 20 a of the first bearing 20. The spring 188 is a weak spring, and the outer ring 20a is lightly pressed in the direction of the arrow A2, and is displaced according to the backlash of the first bearing 20 in the axial direction.

  In step S13, a screw 27 (see FIG. 1) is inserted and screwed into the screw hole 25a to fix the case 24 to the housing 26. This fixing process is performed while the case 24 is heated to a predetermined temperature and is not allowed to cool.

  In step S14, the case 24 is cooled and cooled to room temperature. This cooling process may be either forced cooling (air cooling or the like) or natural cooling. The case 24 is contracted in the radial direction and the axial direction by being cooled.

  At this time, as shown in FIG. 12, the bearing press-fit portion 24e also shrinks in the radial direction (shrinks from the imaginary line portion to the solid line portion), so there is no gap between the outer ring 20a of the first bearing 20 and so-called shrink fitting. As a result, the outer ring 20a is fixed.

  Further, as shown in FIG. 13, the case 24 contracts in the axial direction as it cools, so that the axial length H + Δh of the large-diameter portion 24 a during heating becomes the original length H.

  At this time, by setting the diameter of the bearing press-fit portion 24e to an appropriate value with respect to the outer ring 20a, first, the outer ring 20a is shrink-fitted and fixed by the bearing press-fit portion 24e. At this time, the large diameter portion 24a also contracts in the axial direction, but the axial contraction amount is small at the time when the outer ring 20a is fixed. Moreover, when performing forced cooling by air cooling etc., the part of the small diameter part 24b may be first cooled in a filling manner, and then the large diameter part 24a may be cooled.

  Thereafter, as shown in FIG. 13, the large diameter portion 24a contracts by Δh in the axial direction, and the outer ring 20a already fixed to the bearing press-fit portion 24e is drawn in the direction of the arrow A2 and displaced. As described above, since the side surface of the outer ring 20a is already pressed in the direction of the arrow A2 by the small flange 186b, there is simply no room for further displacement. However, since the small flange 186b is only slightly positioned by being pressed lightly by the weak spring 188, and the heat shrinkage amount Δh is very small, the outer ring 20a is elastically more than Δh with respect to the inner ring 20b. It is displaced in the direction of arrow A2.

  The small diameter portion 24b also contracts in the axial direction. However, the small diameter portion 24b is shorter in the axial direction than the large diameter portion 24a, so that the amount of contraction is small, and the small diameter portion about the axial position of the bearing press-fit portion 24e. The amount of contraction of 24b may not be taken into consideration.

  In step S15, it is confirmed that the case 24 has sufficiently cooled and contracted in the axial direction. If cooling is insufficient, wait until the temperature drops. As the confirmation means at this time, a predetermined thermometer, a predetermined displacement sensor 400 (see FIG. 13) or the like that monitors the contraction amount of the case 24 based on the distance E to the small diameter portion 24b can be used. When the displacement sensor 400 is used, the process may move to step S16 when the contraction amount reaches a specified value.

  In step S <b> 16, the rotating electrical machine 10 is removed from the assembly adjustment device 100. Specifically, the bolt clamp 182 is loosened and the swing lever 158 is removed from the first notch 150a to raise the case holding portion 148 in the direction of the arrow A1. Furthermore, the rotating electrical machine 10 is taken out by loosening the clamp 122 and removing the housing 26 from the housing operation unit 112. At this time, since the first center pin 124 is separated from the rotor 14, the original X1 μm preset is canceled.

  The clearance in the axial direction of the first bearing 20 in such assembly adjustment will be described in an organized manner with reference to FIGS. 14A to 14D. First, as shown in FIG. 14A, the rotor 14 is preset and displaced from the predetermined reference position O by the first center pin 124 by X1 μm in the direction of the arrow A1. At this time, the press-fitted inner ring 20b is similarly displaced.

  Next, as shown in FIG. 14B, the outer ring 20a is lightly pressed in the direction of the arrow A2 by the spring 188 via the small flange 186b to be held and positioned. Accordingly, the outer ring 20a is positioned at a position preset by X2 μm from the reference position O. Here, X2 <X1, and the difference β = X1−X2 is obtained in advance by calculation or experiment.

  Next, as shown in FIG. 14C, the outer ring 20a is fixed in the radial direction by shrink fitting of the bearing press-fit portion 24e, and is pulled by Δh in the arrow A2 direction. As a result, the displacement amount α of the outer ring 20a with respect to the reference position O is α = X1−β−Δh. FIG. 14C shows an example in which Δh is relatively large and displacement amount α is a negative value (value in the direction of arrow A2).

  Further, as shown in FIG. 14D, by removing the first center pin 124 from the rotor 14, the presetting of the rotor 14 and the inner ring 20b is released and returns to the reference position O. As is apparent from FIG. 14D, the axial displacement between the outer ring 20a and the inner ring 20b eventually coincides with the displacement amount α. Therefore, by adjusting the initial preset amount X1 and / or the thermal expansion amount Δh defined by the temperature rise Δt, the displacement amount α can be freely adjusted. Adjust accordingly.

  Specifically, assuming that the rotating electrical machine 10 is assembled to a vehicle handle shaft or the like, there is almost no noise or vibration when the rotor 14 rotates, and it is good to rotate moderately lightly. The displacement amount α may be set so that the axial gap of the first bearing 20 is appropriately reduced so that a good handle feeling can be obtained.

  The rotating electrical machine 10 that has been assembled and adjusted in this way is subjected to predetermined post-processing such as connecting the external conductor 40 and attaching the coupling tool 42 thereafter, and the assembly of the rotating electrical machine 10 is completed.

  As described above, in the method for adjusting the rotating electrical machine 10 according to the present embodiment, the rotor 14 is displaced in advance by a specified distance X1 μm in the preset step, and then the outer ring 20a of the first bearing 20 is baked by the case 24. The outer ring 20a is displaced by Δh in the opposite direction (arrow A2 direction) to the displacement in the preset process by the axial contraction. Further, by canceling the preset, the axial displacement amount α between the outer ring 20a and the inner ring 20b becomes a distance obtained by subtracting the contraction movement amount Δt of the case 24 and the known value β from the preset displacement X1 μm. As a result, the shift amount α between the outer ring 20a and the inner ring 20b can be arbitrarily adjusted according to the preset displacement X1 (or X2) and the degree of the temperature rise Δt of the case 24. Further, since the adjustment of the shift amount α is performed in the assembly process of the housing 26 and the case 24, a dedicated adjustment process and an adjustment device are unnecessary, and can be performed easily and in a short time.

  Since the rotating electrical machine 10 assembled in this way is adjusted so that the axial gap becomes an appropriate value, for example, when assembled on a handle shaft, vibration and noise do not occur, and Good handle feeling that is moderately light is obtained. Furthermore, the assembled rotary electric machine 10 does not have a jig for adjusting the shift amount α, and is simple, inexpensive and highly reliable.

  Moreover, according to the assembly adjustment apparatus 100 of the rotating electrical machine 10 according to the present embodiment, the heated case 24 is held by the case holding cylinder 170, and the case holding cylinder 170 is fixed to the first fixed position. Since the flange 25 of the case 24 can be pressed against the housing 26 by the elastic force of the spring 164, the case 24 can be accurately shrink-fitted and fixed to the outer ring 20a. At this time, the outer ring 20a can be displaced in the direction of the arrow A2 when the case 24 is subsequently cooled by displacing the rotor 14 by the predetermined distance X1 by the first center pin 124. Accordingly, when the first center pin 124 is removed, the axial displacement amount α between the outer ring 20a and the inner ring 20b of the first bearing 20 is a distance obtained by subtracting the amount of contraction movement Δh of the case and the known β from the preset displacement X1. It becomes. This deviation amount α can be in the direction of arrow A1 or in the direction of arrow A2 when viewed from the reference position O, and may be set according to the design conditions.

  The adjusting method and the adjusting device for the rotating electrical machine according to the present invention are not limited to the above-described embodiments, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

It is sectional drawing of a rotary electric machine. It is a partial cross section front view of the assembly apparatus of the rotary electric machine which concerns on this Embodiment. It is a partial cross section side view of the assembly apparatus of the rotary electric machine which concerns on this Embodiment. It is a section front view of a case holding cylinder. It is a flowchart (the 1) which shows the procedure of the assembly method of the rotary electric machine which concerns on this Embodiment. It is a flowchart (the 2) which shows the procedure of the assembly method of the rotary electric machine which concerns on this Embodiment. It is a section front view of the housing operation part in which the temporary assembly was placed. It is a partial cross section front view of the adjustment mechanism part of the state which fixed the case holding cylinder to the 2nd fixed position. It is a partial cross section front view of the adjustment mechanism part in the state which rotated the turntable 180 degrees. It is a partial cross section front view of the adjustment mechanism part which shows the state which lowered the case holding cylinder and inserted the case. It is a partial cross section front view of the adjustment mechanism part of the state which returned the turntable to the original angle, and fixed the case holding cylinder to the 1st fixed position. It is a schematic diagram which shows the state which a case shrink | contracts to radial direction by temperature fall. It is a schematic diagram which shows the state which a case shrinks to an axial direction by temperature fall. FIG. 14A is a schematic diagram showing the state of the first bearing in the presetting process, FIG. 14B is a schematic diagram showing the state of the first bearing in which the outer ring is pressed by a small flange, and FIG. FIG. 14D is a schematic diagram showing the state of the first bearing in which the outer ring is drawn in the direction of the arrow A2, and FIG. 14D is a schematic diagram showing the state of the first bearing after the preset by the first center pin is cancelled.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Rotary electric machine 14a, 14b ... End part 14e, 14f ... Center groove | channel 20 ... 1st bearing 20a, 22a ... Outer ring 20b, 22b ... Inner ring 22 ... 2nd bearing 24 ... Case 24a ... Large diameter part 24b ... Small diameter part 24e ... Bearing press-fitting portion 25 ... Flange 26 ... Housing 100 ... Assembly adjusting device 110 ... Turntable 112 ... Housing operation portion 114 ... Case operation portion 115 ... Lock mechanism 118 ... Housing fixing jig 124 ... First center pin 140 ... Main rail 142 ... Main Elevating body 144 ... Sub rail 146 ... Sub elevating body 148 ... Case holding part 150 ... Positioning engagement plate 150a ... First notch 150b ... Second notch 162 ... Bar 164 ... Spring 170 ... Case holding cylinder 172 ... Weight part 180 ... Ring Member 182 ... Bolt clamp 184 ... First sleeve 1 6 ... second sleeve 186b ... small flange 187, 188 ... spring 190 ... second center pin 300 ... temporary assembly

Claims (6)

A method of assembling a rotating electrical machine having a first bearing press-fitted into a cylindrical case fixed to a housing and a rotor pivotally supported by a second bearing press-fitted into the housing,
A press-fitting step of press-fitting the inner ring of the second bearing and the inner ring of the first bearing into the respective prescribed locations in the rotor, and press-fitting the outer ring of the second bearing into the housing;
A preset step of holding the rotor displaced by a predetermined distance by pressing the rotor toward the first bearing with respect to the housing;
A mounting step of mounting the cylindrical case heated to a predetermined temperature from the first bearing side, and fixing the cylindrical case to the housing while pressing the cylindrical case in an axial direction;
The cylinder case is cooled, and the cylinder case is contracted in the radial direction to be shrink-fitted and fixed to the outer ring of the first bearing, and the cylinder case is contracted in the axial direction to fix the first bearing. A cooling step of displacing the outer ring of the outer ring toward the second bearing;
Holding the displacement of the rotor, and releasing the release of the case;
A method of assembling a rotating electric machine, comprising: The method of assembling a rotating electrical machine according to claim 1,
A method of assembling a rotating electrical machine, wherein the amount of contraction of the cylindrical case in the cooling step is monitored, and the retention of the displacement of the rotor is released when the amount of contraction reaches a specified value. The method of assembling a rotating electrical machine according to claim 1,
Rotation characterized in that the amount of displacement in the preset step is set based on the amount of final contraction of the cylindrical case after the cooling step and the amount of axial displacement between the inner and outer rings of the first bearing. Assembly method of electric machine. An assembly apparatus for a rotating electrical machine having a first bearing press-fitted into a cylindrical case fixed to a housing and a rotor pivotally supported by a second bearing press-fitted into the housing,
A housing holding portion for holding the housing;
A first center pin that presses the rotor toward the first bearing to displace it by a predetermined distance;
A case holding portion for holding the heated cylindrical case;
A case pressing portion that presses the mounting portion of the case holding portion with respect to the housing toward the housing;
A slide mechanism for sliding the case holding portion in an axial direction so as to freely advance and retract;
A first slide fixing portion for operating the case pressing portion by fixing the slide mechanism at a first fixing position;
An assembly apparatus for a rotating electrical machine, comprising: The assembly apparatus for a rotating electrical machine according to claim 4,
The assembly apparatus according to claim 1, wherein the assembly apparatus includes a rotation mechanism that vertically arranges the housing holding part and the case holding part and reverses the vertical direction. The assembly apparatus for a rotating electrical machine according to claim 4,
A second center pin provided on the case holding portion side and supporting the shaft end of the rotor;
A pin pressing portion for pressing the second center pin;
A second slide fixing portion for operating the pin pressing means by fixing the slide mechanism at a second fixing position;
With
2. The rotating electrical machine assembly apparatus according to claim 1, wherein the second fixed position is set at a position farther from the housing than the first fixed position and where the case pressing portion does not act.

Images