JP6365287B2 - Assembly method and assembly apparatus - Google Patents

Description

  The present invention relates to a method and an apparatus for accurately press-fitting and assembling an assembly part such as a sensor part on a rotary shaft that is pivotally supported by a work body such as a motor.

  In the electric power steering apparatus, a motor that generates steering assist torque controls power supply in accordance with the rotation angle of the rotor. For this reason, it is considered to detect a rotation angle by attaching a magnetic sensor component to a shaft that rotates together with the rotor. However, in recent years, an assembly including a sheet metal part is used in the motor main body, and the shaft is supported by the motor main body through a bearing member. It tends to tilt with respect to the motor body. In this state, if the press fitting assembly of the sensor part is performed on the end portion of the shaft, the shake after the assembly becomes large, which affects the sensor performance. In addition, there is a possibility that a problem may occur in the component by being press-fitted obliquely with respect to the shaft.

  As a conventional technique for assembling components to a shaft that is pivotally supported, Patent Document 1 discloses that a cylindrical pipe-shaped sleeve is arranged on the outer periphery of a shaft, and flanges having shaft bearings are press-fitted at both ends, and applied in advance. An apparatus for assembling a magnet roll by bonding with an adhesive is disclosed. With this device, the flange is gripped with a chuck, the amount of deformation in the axial direction of the sleeve is measured, and the deflection is corrected by applying a force so as to cancel the deformation. Is raised.

JP 7-108423 A

  However, as in the method of Patent Document 1, it is not easy to correct while measuring different shakes for each assembly, and the method using an adhesive is complicated and troublesome. In addition, it is difficult to apply the method of Patent Document 1 in which the shaft and sensor parts of the motor for an electric power steering apparatus are subjected to deformation to correct the shake. For this reason, the method of satisfying the required performance by press-fitting and assembling the sensor parts directly to the shaft of the motor has not been put into practical use.

  Therefore, the present invention can accurately press-fit an assembly part such as a sensor part into the end of a rotating shaft that is pivotally supported by a work body such as a motor, and can reduce a shake after the assembly to prevent a performance deterioration. It is to realize an assembling method and an assembling apparatus.

In order to solve the above problem, the invention according to claim 1 of the present invention provides:
It is a method of press-fitting and assembling a fitting cylinder part provided in an assembly part on one end side of a rotating shaft pivotally supported by a cylindrical work body,
The first shaft and the second shaft are arranged coaxially so that they can be moved back and forth across the rotating shaft, and both shafts are advanced toward both ends of the rotating shaft to support the centers of both ends of the rotating shaft. A first step of centering by doing
A plurality of guide portions are arranged so as to be able to move back and forth, facing a plurality of locations on the outer peripheral surface of the work main body, and the plurality of guide portions are respectively advanced toward the outer peripheral surface of the work main body. A second step of retracting one of the first shaft and the second shaft located on one end side of the rotating shaft in a state where the work main body is held in a position of contact with the outer peripheral surface of the first shaft and the second shaft; When,
Between the one shaft and the rotating shaft, a centering holding portion that supports the holding surface for holding the assembly component in a floating manner in the same plane is carried in, and is coaxially arranged with the one shaft. A third step of causing the fitting tube portion to face one end of the rotating shaft;
The fourth shaft is advanced, the assembly part is pressed to one end side of the rotating shaft through the alignment holding portion, and the fitting tube portion is press-fitted in accordance with the one end side of the rotating shaft. The process is characterized by comprising:

The invention according to claim 2 of the present invention is
In the first step, the support shaft, which is the first shaft, is disposed to face the lower end side of the rotating shaft so as to be vertically movable, supports the rotating shaft from the lower end side, and is the second shaft. The pressing shaft is arranged opposite to the upper end side of the rotating shaft so as to be vertically movable, and is supported from the upper end side of the rotating shaft, thereby aligning the rotating shaft in the vertical direction,
In the second to fourth steps, with the one shaft as the pressing shaft, the pressing shaft located on the upper end side of the rotating shaft is lifted to release the support of the rotating shaft, and then the rotating shaft and the pressing shaft are released. The alignment holding portion is carried in between the shafts, and the fitting tube portion is pressed into the upper end side of the rotating shaft.

The invention according to claim 3 of the present invention is
An apparatus for press-fitting and assembling a fitting cylinder portion provided in an assembly part on one end side of a rotating shaft pivotally supported by a cylindrical work body,
A work receiving unit that causes the drive unit to move up and down the support shaft disposed opposite to the lower end side of the rotating shaft; and a work pressing unit that causes the drive unit to move up and down the pressing shaft disposed opposite to the upper end side of the rotating shaft, A vertical centering mechanism that supports the centers of both ends of the rotating shaft by coaxially arranging the supporting shaft and the pressing shaft and moving up or down from both sides toward the rotating shaft;
A plurality of guide portions opposed to a plurality of locations on the outer peripheral surface of the work main body, and a plurality of drive portions for moving the plurality of guide portions back and forth. A work lock portion that abuts on the outer peripheral surface and holds the position at the same time is provided. When the vertical centering mechanism is operated, the work lock portion is operated to hold the work main body, and then the pressure shaft is raised. A vertical holding mechanism for releasing the support on the upper end side of the rotating shaft;
A floating mechanism that is carried into the upper end side of the rotating shaft and can be arranged coaxially with the pressing shaft, and that supports the holding surface that holds the assembled component in a floating manner in a horizontal plane, and the holding surface at the initial position. The pressing shaft having a centering holding portion having a locking mechanism for holding, and coaxially arranged after the alignment holding portion is carried in a locked state between the rotating shaft and the pressing shaft when the vertical holding mechanism is operated. A press-fitting mechanism that presses the assembled part to the upper end side of the rotating shaft through the holding surface that is in a floating state and press-fits the fitting tube portion to the upper end side of the rotating shaft. Are provided.

  According to a fourth aspect of the present invention, there is provided a carry-in mechanism for reciprocating the alignment holding portion between a component supply portion in which the assembly component is accommodated and a press-fitting position.

  In a fifth aspect of the present invention, the work lock portion is arranged such that the plurality of guide portions are opposed to three locations on the outer peripheral surface of the work body.

  In a sixth aspect of the present invention, the workpiece is a motor, and the assembly component is a sensor component that detects the rotation of the rotation shaft.

  In the assembling method of the present invention, the first shaft and the second shaft are arranged coaxially with the rotating shaft pivotally supported by the work body, and after moving forward so as to support the centers of both ends of the rotating shaft, By holding the outer periphery of the workpiece main body with a plurality of guide portions, the rotation shaft can be centered, and one shaft on the assembly side can be moved backward while maintaining this state. Then, the assembled parts are carried in using the alignment holding part having a floating function, and the alignment holding part is pressed toward the rotation axis by using one of the retracted shafts. The cylindrical portion can be press-fitted along the one end side of the rotating shaft.

  Therefore, according to the present invention, the centering of the rotating shaft is facilitated, the positioning of the assembly parts is facilitated, and the centering holding part is used to press-fit while correcting a slight misalignment of the assembly parts. High assembly accuracy can be secured. Therefore, assembly parts such as sensor parts can be press-fitted with high precision to the end of the rotating shaft that is pivotally supported by the work body such as a motor, and a high-performance product can be obtained by reducing runout after assembly. be able to.

It is the schematic which shows the principal part structure of the assembly | attachment apparatus in 1st Embodiment of this invention. It is a principal part enlarged view which shows the assembly structure of the shaft and sensor magnet in 1st Embodiment. 1 is an overall perspective view of an electric power steering motor to be assembled. FIG. 1 is an overall cross-sectional view of an electric power steering motor to be assembled. It is a figure which shows the relationship between the deflection | deviation after sensor magnet press-fit, and sensor performance. It is a principal part schematic diagram of the vertical centering mechanism and vertical holding mechanism of a shaft for demonstrating the assembly method in 1st Embodiment. It is a principal part schematic diagram of the shaft press fitting mechanism for demonstrating the assembly method in 1st Embodiment. It is the whole assembly apparatus perspective view and its principal part enlarged view in 2nd Embodiment of this invention. It is a partial expansion perspective view which shows the work-lock part structure of the assembly | attachment apparatus in 2nd Embodiment. It is the schematic which shows the conveyance part structure of the assembly | attachment apparatus in 2nd Embodiment, and its partial expansion perspective view. It is a schematic diagram for demonstrating the assembly | attachment process by the assembly | attachment apparatus of 2nd Embodiment. It is a schematic diagram for demonstrating the assembly | attachment process by the assembly | attachment apparatus of 2nd Embodiment. It is a schematic diagram for demonstrating the assembly | attachment process by the assembly | attachment apparatus of 2nd Embodiment. It is a schematic diagram for demonstrating the assembly | attachment process by the assembly | attachment apparatus of 2nd Embodiment. It is a schematic diagram for demonstrating the assembly | attachment process by the assembly | attachment apparatus of 2nd Embodiment. It is a schematic diagram for demonstrating the assembly | attachment process by the assembly | attachment apparatus of 2nd Embodiment. It is a schematic diagram for demonstrating the assembly | attachment process by the assembly | attachment apparatus of 2nd Embodiment. It is a schematic diagram for demonstrating the assembly | attachment process by the assembly | attachment apparatus of 2nd Embodiment. It is a schematic diagram for demonstrating the assembly | attachment process by the assembly | attachment apparatus of 2nd Embodiment. It is a schematic diagram for demonstrating the assembly | attachment process by the assembly | attachment apparatus of 2nd Embodiment.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a schematic structure of the main part of an assembling apparatus 1 that implements the assembling method of the present invention. Here, the alignment assembly unit U2 located on the upper end side cooperates to press-fit the assembly component W2. The support unit U1 includes a work receiving portion 2 that supports the other end (here, the lower end) side of the shaft S, and a work lock portion 3 that supports the outer peripheral surface of the work W. The alignment assembly unit U2 includes an alignment holding portion 4 that holds the assembly component W2 in a floating state and introduces it to the assembly position, and one end side of the shaft S or one end surface of the alignment holding portion 4 (here Then, it has the work pressing part 5 which contacts the upper end surface) side and performs centering or press fitting assembly. The workpiece receiving portion 2 has a support shaft 21 that is a first shaft, and the workpiece pressing portion 5 has a pressing shaft 51 that is a second shaft. Details of these parts will be described later.

  In the workpiece W to which the present invention is applied, a shaft S as a rotation shaft is rotatably supported by a cylindrical workpiece body W1, and an assembly part W2 having a fitting cylinder portion W21 is coaxially provided at one end thereof. It has a configuration to be attached (see FIG. 1B). Preferably, the assembly part W2 is a sensor part attached to the workpiece W. In the present embodiment, a case will be described in which the workpiece W is a motor M for electric power steering of an automobile shown in FIGS. 2A and 2B, and a sensor magnet M2 of a magnetic sensor is press-fitted and assembled as an assembly component W2. In the motor M, a motor body M1 that is a workpiece body W1 is constituted by a cylindrical case M11 and a pair of frame ends M12 at both ends thereof, and is fastened and integrated by a plurality of through bolts M4. The shaft S is accommodated in a shaft hole formed on the central axis of the motor body M1, and the outer periphery of both ends is rotatably supported by bearings M5. In the cylindrical case M11, known motor components such as the stator M7 are accommodated on the outer periphery of the rotor M6 integrated with the shaft S.

  Both ends of the shaft S protrude from the frame end M12, and the sensor magnet M2 is press-fitted into the upper end side thereof. As shown in FIG. 1B, the sensor magnet M2 has a stepped cylindrical holder M3, and the lower half of the small-diameter holder is a fitting cylindrical portion W21 corresponding to the outer diameter of the shaft S. A disk-shaped magnet Mg is accommodated in the half portion. Preferably, as shown in the drawing, the fitting cylinder portion W21 is chamfered by chamfering the inner peripheral edge at the lower end, and chamfering the upper edge of the corresponding shaft S together. As a result, the effect of facilitating the press-fitting of the shaft and preventing scratches during the press-fitting can be obtained. When the motor M is driven, the magnetic sensor detects the rotor rotation angle by measuring the magnetic change of the sensor magnet M2 that rotates integrally with the shaft S by a magnetic detection unit (not shown).

  Here, in the motor M, for example, the cylindrical case M11 is made of sheet metal, and the motor main body M1 is formed of an assembly of a plurality of parts to reduce costs. However, on the other hand, variations during processing and assembly are likely to occur, and the shaft S is held with a gap between it and the bearing M5, so that the shaft S is assembled to the motor body M1 without axis misalignment. It ’s difficult. For this reason, when the sensor magnet M2 is press-fitted and assembled to the shaft S, the flange surface of the frame end M32, which is a highly accurate cutting surface, is generally used as a reference surface, but the shaft S is subject to vibration with respect to the reference surface. If so, the sensor magnet M2 may be press-fitted obliquely. At this time, considering the vibration of the sensor magnet M2 with respect to the shaft S, the maximum value (for example, 0.25 mm) of the vibration after press-fitting may exceed the required specification (for example, 0.2 mm or less). Necessary.

  FIG. 3 shows the relationship between the shake after press-fitting the sensor magnet M2 and the sensor performance (angle error). If the eccentric amount of the sensor magnet M2 is within the normal range (for example, 0.5 mm or less), It can be seen that the angular error during detection by the magnetic sensor is less than the desired range when the deflection of the lens satisfies the required specification (for example, 0.2 mm or less).

  Therefore, the present invention provides a work receiving portion 2 and a work guide portion 3 in the support unit U1 in the assembling apparatus 1 of FIG. Each motor body M1 can be supported. Further, the alignment assembly unit U2 is provided with an alignment holding portion 4 and a work pressing portion 5 to increase alignment accuracy of the shaft S and the sensor magnet M2. The work receiving part 2 and the work guide part 3 of the support unit U1 and the alignment holding part 4 and the work pressing part 5 of the alignment assembly unit U2 can be independently controlled by the control part (not shown). Yes, each mechanism schematically shown in FIGS. 4 and 5 is configured. Each of these mechanisms corresponds to the first to fourth steps in the assembling method of the present invention. That is, the vertical centering mechanism and the vertical holding mechanism of the shaft S shown in FIG. 4 perform the vertical centering process (first process) and the vertical holding process (second process) of the shaft S of the sensor magnet M2 shown in FIG. The press-fitting mechanism similar to the carry-in mechanism sequentially performs the carry-in process (third process) and the press-fitting process (fourth process) of the sensor magnet M2. Hereinafter, each mechanism and each process will be described.

  In FIG. 4, the vertical centering mechanism of the shaft S is made up of the work receiving part 2 of the support unit U1 and the work holding part 5 of the alignment assembly unit U2, and the vertical holding mechanism of the shaft S is made up of the support unit U1 and the work holding part. It is comprised by 5. The workpiece receiving portion 2 includes a support shaft 21 that moves up and down facing the lower surface of the shaft S and an air cylinder 22 that is a drive portion. The support shaft 21 that is integral with the rod of the air cylinder 22 is lifted to form a pin-like shape. The tip is inserted into the lower surface center hole of the shaft S to hold it. The work lock portion 3 has a plurality of guide portions 31 facing a plurality of locations on the outer peripheral surface of the motor M, and when each guide portion 31 moves forward integrally with a rod of an air cylinder 32 that is a drive portion, The surface is in contact with and held on the outer peripheral surface of the motor M. The work pressing portion 5 is provided with a pressing shaft 51 that moves up and down facing the upper surface of the shaft S and is integrally provided with a rod of a servo press mechanism 52 that is a driving portion, and a pin-shaped tip portion of the pressing shaft 51 is lowered. Then, the shaft S is inserted into the upper surface center hole so that the position can be maintained.

  In the vertical centering step of the shaft S, which is the first step, the support shaft 21 of the workpiece receiving portion 2 and the pressing shaft 51 of the workpiece pressing portion 5 are perpendicular to each other with the shaft S of the motor M being the workpiece W interposed therebetween. Opposed. From this state, the support shaft 21 is raised and the pressing shaft 51 is lowered, and both tip portions located on the same axis are inserted into the lower surface center hole or the upper surface center hole of the shaft S so as to follow and displace, Perform vertical centering. Even if the shaft S has a slight inclination, the pin-shaped tip portions of the support shaft 21 and the pressing shaft 51 enter the center hole from both sides of the shaft S and support it while correcting the inclination. Deviation is easily adjusted.

  In the vertical holding step of the shaft S as the second step, the work lock portion 3 is operated in a state where both ends of the shaft S are supported, and the plurality of guide portions 31 are advanced to contact the outer peripheral surface of the motor M. . The air cylinder 32 is provided with a lock mechanism that stops when the guide portion 31 comes into contact with the motor M and maintains the position thereof. The position of the motor M displaced together with the shaft S in the first step is maintained in that state. can do. Preferably, the guide portions 31 are arranged at three places and the motor M is supported at three points, so that the position can be stably held after the stop. Thereafter, the pressing shaft 51 of the work pressing portion 5 is raised to release the center support on the upper surface of the shaft S held vertically. The pressing shaft 51 is retracted to a position that does not hinder the loading of the sensor magnet M2 in the next process.

  In FIG. 5, the carry-in mechanism for the sensor magnet M2 is provided by the alignment holding part 4 of the alignment assembly unit U2, and the press-fitting mechanism for the sensor magnet M2 is provided by the alignment holding part for the support unit U1 and the alignment assembly unit U2. 4 and the work pressing part 5. The alignment holding unit 4 includes a holding surface 41 that attracts and holds the sensor magnet M2, a floating mechanism that allows the holding surface 41 to be displaced in the XY plane, and a locking mechanism that fixes the holding surface 41 at an initial position. 42 and a conveying hand 43 that conveys the sensor magnet M2 together with the alignment device 42.

  In the carrying-in process of the sensor magnet M2, which is the third process, the sensor magnet M2 is held on the holding surface 41 with the alignment device 42 locked, and is introduced to the position facing the upper surface of the shaft S by the transport hand 43. . Next, in the fourth press-fitting step that is the fourth step, the alignment device 42 is unlocked, the pressing shaft 51 of the work pressing portion 5 is lowered, and the conveying hand 43 is pushed down from above. The conveyance hand 43 is controlled so that the center of the holding surface 41 is positioned on the vertical axis of the shaft S, and the holding surface 41 can float, so that the pressing shaft 51 and the conveyance hand 43 are aligned. When 42 is pressed and the sensor magnet M2 comes into contact with the upper surface of the shaft S, the sensor magnet M2 is pressed into the shaft S while being displaced according to the position.

  In the profile press-fitting mechanism, in the third step, the sensor magnet M2 and the holding surface 41 are loaded so that the centers thereof coincide with each other. May tilt. In order to avoid this, the sensor magnet M2 is held on the holding surface 41 so as to be able to float, and a horizontal load is prevented from being applied to the upper surface of the shaft S in the free state. The magnet M2 can be easily and accurately press-fitted. When the work pressing unit 5 controls the pressing amount of the pressing shaft 51 with the servo press mechanism 52 and moves to the press-fitting completion position, the alignment holding unit 4 releases the suction of the sensor magnet M2, and the press-fitting is completed.

  6 to 8 show a second embodiment of the present invention. The present embodiment is a detailed configuration example that embodies the assembling apparatus 1 of FIG. 1, and the main configuration is the same and the same reference numerals are attached. In FIG. 6, the support unit U <b> 1 is arranged on the base 11. Then, the temporary placement table 12 of the motor M as the workpiece W is slidably provided, and the outer peripheral surface of the motor M is positioned and placed on the horizontal upper surface. The temporary table 12 has an opening at the center, and a work receiving portion 2 (see FIG. 1) for supporting the motor M from below is disposed below the temporary placement table 12. On the outer periphery of the motor M, the work lock portion 3 is disposed on a U-shaped fixed base 13 fixed to the base 11. Above the motor M, the alignment holding part 4 and the work pressing part 5 of the alignment assembly unit U2 are coaxially arranged.

  In FIG. 7, the work lock portion 3 has three cylindrical guide portions 31 arranged radially so as to face three locations on the upper outer peripheral surface of the motor M, and is arranged on the back side of each guide portion 31. An air cylinder 32 is connected. The air cylinder 32 is mounted on the fixed base 13 by an L-shaped flange 14, and when a rod 33 extending forward of the air cylinder 32 extends the guide portion 31 in the radial direction of the motor M, the disc-shaped tip surface of the guide portion 31 is the motor M. Abut. The air cylinder 32 presses the guide portion 31 with a relatively weak force that does not displace the motor M at the time of contact, and securely holds the motor M from the side. Here, the installation positions of the three guide portions 31 are appropriately set according to the outer peripheral shape of the motor M, and the tip end surface of the guide portion 31 is in contact with the outer peripheral surface of the motor M so as to be able to support three points. If it is, it does not necessarily need to be equally arranged.

  In FIG. 6, the work pressing portion 5 includes a known servo press mechanism 52, converts the rotation of the servo motor into a linear motion in the vertical direction, and aligns the tip end portion (lower end portion in the figure) of the pressing shaft 51. Drive towards 4. The alignment holding unit 4 has a base 43 that is positioned coaxially with the pressing shaft 51, and holds the sensor magnet M2 at the lower end of the shaft 44 via an alignment device 42 that includes a known floating mechanism and lock mechanism. A suction holding unit 45 is attached. The base portion 43 is supported by a slide member 46 so that the middle portion with a large diameter can be moved up and down, and can be lowered integrally when the distal end portion of the pressing shaft 51 is inserted into the upper end center hole of the shaft portion 44.

  In FIG. 8, the alignment holding part 4 is movable in the horizontal direction along the rail member 61 of the conveying part 6 constituting the carry-in mechanism together with the rail member 47 to which the slide member 46 is attached. The sensor magnet M2 is carried into the assembly position. At the time of carry-in, the alignment device 42 of the alignment holding unit 4 is locked and the respective units are coaxial, and the sensor magnet M2 is held in close contact with the distal end surface of the suction holding unit 45 by a known vacuum suction mechanism or the like. The alignment holding unit 4 is provided so that the sensor magnet M2 can be rotated around the axis of the base 43 together with the alignment device 42, and the rotational position of the sensor magnet M2 with respect to the motor M can be adjusted.

  FIG. 9 shows details of the assembling process using the assembling apparatus 1 of the present embodiment. The alignment holding unit 4 of the alignment assembling unit U2 supplies components by the conveying unit 6 at the initial position of FIG. 9A. The pallet 62 moves upward and faces the sensor magnet M <b> 2 accommodated in the pallet 62. The motor M is positioned on the temporary table 12 in FIG. 6, and the work receiving part 2 and work lock part 3 of the support unit U1 and the work pressing part 5 of the alignment assembly unit U2 are in a non-operating state and stand by around the motor M. doing. The conveyance unit 6 includes a visual camera 63 that detects the rotational position of the sensor magnet M2 in the middle of the carry-in path of the alignment holding unit 4.

  9B, the servo press mechanism 52 of the work pressing portion 5 is driven, and the pin-shaped tip portion of the pressing shaft 51 is inserted into the shaft S upper end center hole of the motor M. Next, in FIG. 9C, the air cylinder 22 of the work receiving portion 2 is driven, and the pin M of the support shaft 21 is inserted into the shaft S lower end center hole of the motor M and supported, while the motor M is temporarily placed on the temporary table 12. Raise from. As a result, the shaft S of the motor M is vertically centered by the coaxial support shaft 21 and the pressing shaft 51, and the motor M is supported at two points by the supporting shaft 21 and the pressing shaft 51 at both ends of the shaft S (the first in FIG. 4). Step 1: corresponds to the vertical centering step).

  Next, in FIG. 9D, the three air cylinders 32 of the work lock unit 3 are driven, and the distal end surface of the guide unit 31 is advanced until it abuts against the outer peripheral surface of the motor M and is locked at that position. Accordingly, the motor M can be laterally supported at three positions from the side while the shaft S is vertically held from above and below, and the pressing shaft 51 that drives the servo press mechanism 52 and supports the upper end of the shaft S in FIG. 9E. Can be retracted (second step in FIG. 4: corresponding to the vertical holding step).

  9F, the alignment holding unit 4 moves the slide member 46 of FIG. 8 up and down to hold the sensor magnet M2 accommodated in the pallet 62 and take it out. In FIG. 9G, in the middle of the transfer to the press-fitting position by the transport unit 6, the alignment holding unit 4 is stopped on the visual camera 63, and the rotational position of the sensor magnet M2 is confirmed. At this time, the orientation holding unit 4 is rotated based on the image of the visual camera 63 to correct the orientation of the sensor magnet M2. Thus, in FIG. 9H, the sensor magnet M2 held by the alignment holder 4 can be conveyed to the press-fitting position above the motor M in a preset orientation (third step: carry-in in FIG. 5). Corresponding to the process).

  In FIG. 9H, after the alignment holding part 4 is stopped above the motor M, when the servo press mechanism 52 of the work pressing part 5 is driven, the pin-shaped tip of the pressing shaft 51 is moved to the axis of the alignment holding part 4. The upper end center hole of the portion 44 is inserted. In FIG. 9I, when the alignment holding unit 4 is pushed down integrally with the pressing shaft 51, the sensor magnet M <b> 2 comes into contact with the upper end of the shaft S of the motor M. In FIG. 9J, when the alignment device 42 of the alignment holding unit 4 is unlocked and the pressing shaft 51 is lowered in a floating state, the sensor magnet M2 moves in a horizontal plane corresponding to the upper end position of the shaft S. (Fourth step in FIG. 5: corresponding to the profile press-fitting step).

  In the said embodiment, although the guide part 31 of the work lock part 3 was demonstrated as the column shape, and the structure which supports three places of the outer periphery of the motor M was demonstrated, the shape and installation number of the guide part 31 are not restrict | limited in particular, It can be changed as appropriate. Means other than the air cylinder may be used for the drive part of the work receiving part 2 and the work lock part 3. Moreover, the alignment holding | maintenance part 4 should just be a structure which can carry out floating support of the sensor magnet M2, and is not restricted to the structure which attracts and holds the sensor magnet M2 to the holding surface 41, You may use another holding means. In addition, each mechanism, each part shape, etc. of support unit U1 and alignment assembly unit U2 are not restricted to the structure mentioned above, It can change suitably.

  The assembling method and the assembling apparatus of the present invention are not necessarily limited to the motor of the electric power steering device, and in various motors and other products, a part having a fitting cylinder portion on the shaft pivotally supported by the work body is press-fitted and assembled. Any structure can be suitably used. And with the shaft itself held vertically, the assembly parts can be pressed together to obtain the effect of minimizing runout after assembly, which is particularly effective for assembly of sensor parts, etc. A product is obtained.

W Work W1 Work body W2 Assembly part W21 Fitting cylinder M Motor M1 Motor body M2 Sensor magnet (sensor part)
DESCRIPTION OF SYMBOLS 1 Assembling apparatus 2 Work receiving part 21 Support shaft 3 Work lock part 31 Guide part 4 Alignment holding part 41 Holding surface 42 Alignment apparatus 5 Work pressing part 51 Pressing shaft 51

Claims (6)

A method of press fitting and assembling a fitting cylinder portion (W21) provided in an assembly component (W2) on one end side of a rotating shaft (S) pivotally supported by a cylindrical work body (W1),
The first shaft (21) and the second shaft (51) are arranged coaxially so as to be able to move back and forth across the rotation shaft, and both shafts are advanced toward both ends of the rotation shaft to rotate the rotation. A first step of centering by supporting the center of both ends of the shaft;
A plurality of guide portions (31) are arranged so as to be able to move back and forth, facing a plurality of locations on the outer peripheral surface of the work body, and the plurality of guide portions are respectively advanced toward the outer peripheral surface of the work body, One of the first shaft and the second shaft that is located on one end side of the rotating shaft is retracted while the work main body is held in a position where the work main body is in contact with the outer peripheral surface of the work main body. A second step of
An alignment holding portion (4) for supporting the holding surface (41) holding the assembly component in a floating manner in the same plane is carried between the one shaft and the rotating shaft, and the one shaft And a third step of causing the fitting tube portion to face the one end side of the rotating shaft,
The fourth shaft is advanced, the assembly part is pressed to one end side of the rotating shaft through the alignment holding portion, and the fitting tube portion is press-fitted in accordance with the one end side of the rotating shaft. And an assembly method comprising the steps of: In the first step, the support shaft, which is the first shaft, is arranged to face the lower end side of the rotating shaft so as to be movable up and down, supports the rotating shaft from the lower end side, and is the pressing that is the second shaft The shaft is arranged to be opposed to the upper end side of the rotating shaft so as to move up and down and is supported from the upper end side of the rotating shaft, thereby aligning the rotating shaft in the vertical direction,
In the second to fourth steps, with the one shaft as the pressing shaft, the pressing shaft located on the upper end side of the rotating shaft is lifted to release the support of the rotating shaft, and then the rotating shaft and the pressing shaft are released. The assembly method according to claim 1, wherein the alignment holding portion is carried in between the shafts, and the fitting tube portion is pressed into the upper end side of the rotating shaft. An apparatus for press-fitting and assembling a fitting cylinder part (W21) provided in an assembly part (W2) on one end side of a rotating shaft (S) pivotally supported by a cylindrical work body (W1),
A work receiving part (2) in which a drive part (22) moves up and down a support shaft (21) arranged to face the lower end side of the rotating shaft, and a pressing shaft (51) arranged to face the upper end side of the rotating shaft. The part (52) has a work pressing part (5) that moves up and down, and the support shaft and the pressing shaft are arranged coaxially, and the rotating shaft is moved upward or downward from both sides toward the rotating shaft. A vertical centering mechanism that supports the center of both ends,
It has a plurality of guide parts (31) facing a plurality of places on the outer peripheral surface of the work body, and a plurality of drive parts (32) for moving these guide parts back and forth, and each of the plurality of guide parts is moved forward And a work lock portion (3) that holds the position of the work main body at the same time as the outer peripheral surface of the work main body. When the vertical centering mechanism is operated, the work lock portion is operated to position the work main body. A vertical holding mechanism that lifts the pressing shaft and releases the support on the upper end side of the rotating shaft after being held;
A floating mechanism that is carried into the upper end side of the rotating shaft and is provided so as to be coaxially arranged with the pressing shaft, and that supports the holding surface (41) that holds the assembled part in a floating manner in a horizontal plane, and the holding surface. An alignment holding part (4) having a lock mechanism for holding in an initial position is provided, and when the vertical holding mechanism is operated, the alignment holding part is carried in a locked state between the rotating shaft and the pressing shaft. The pressing shaft arranged coaxially is lowered to press the assembled part to the upper end side of the rotating shaft through the holding surface in a floating state, and the fitting tube portion is made to follow the upper end side of the rotating shaft. An assembling apparatus comprising a press-fitting mechanism for press-fitting.   The assembling apparatus according to claim 3, further comprising a carry-in mechanism for reciprocating the alignment holding part between a part supply part in which the assembly part is accommodated and a press-fitting position.   5. The assembly apparatus according to claim 3, wherein the work lock unit is configured such that the plurality of guide units are arranged to face three locations on the outer peripheral surface of the work body. The workpiece (W) including the workpiece main body and the assembly component is a motor (M), and the assembly component is a sensor component (M2) for detecting rotation of the rotation shaft. The assembling method or the assembling apparatus according to any one of claims.

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