Rotor manufacturing equipment

Abstract

The present invention provides a rotor manufacturing apparatus that can suppress overfilling of resin material into the slots. [Solution] The manufacturing apparatus comprises a plurality of plungers 80 and a drive unit 90. The plurality of plungers 80 extrude a plurality of resin materials 30 toward a plurality of slots 14. The drive unit 90 supports the plurality of plungers 80 and is configured to move forward and backward relative to the rotor core 11. The drive unit 90 has a plurality of housing sections 92 and a biasing section 100. The plurality of housing sections 92 house each of the plungers 80 so that they can move relative to the drive unit 90 in the direction of movement. The biasing section 100 biases the plungers 80 from inside the housing sections 92 in the direction of extruding the resin material 30.

Description

Technical Field

[0001] The present invention relates to a manufacturing apparatus for a rotor.

Background Art

[0002] Patent Document 1 discloses a manufacturing apparatus for a rotor (referred to as a core portion in Patent Document 1) which is a rotor of a rotating electric machine. The rotor includes an iron core body having a plurality of magnet insertion holes, a plurality of permanent magnets inserted into each magnet insertion hole, and a plurality of resin fillers filled in each magnet insertion hole.

[0003] The manufacturing apparatus described in Patent Document 1 includes a lower mold, an upper mold having a plurality of accommodation holes, an auxiliary plate having a plurality of resin flow paths, and a plurality of extrusion parts. The lower mold supports a jig on which the iron core body is placed from below. The auxiliary plate is placed on the upper surface of the iron core body. The upper mold sandwiches the jig, the iron core body, and the auxiliary plate together with the lower mold. The plurality of extrusion parts are configured to be integrally movable up and down by one drive source. The plurality of extrusion parts uniformly extrude a plurality of resin materials supplied to the plurality of accommodation holes of the upper mold toward the plurality of magnet insertion holes, thereby filling the resin materials into the magnet insertion holes through the resin flow paths of the auxiliary plate.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in order to make the filling amount of the resin material into the plurality of magnet insertion holes uniform, it is preferable that the volumes of the plurality of resin materials supplied to the plurality of accommodation holes are constant. However, variations may occur in the volume of the resin material.

[0006] In the manufacturing apparatus described in Patent Document 1, multiple extrusion units move together using a single drive source, resulting in the same amount of movement for all extrusion units. Therefore, resin materials with a volume larger than the desired volume may leak out of the filling path due to overfilling of the magnet housing holes. For this reason, in rotor manufacturing, it is desirable to suppress overfilling of resin materials into the magnet insertion holes. [Means for solving the problem]

[0007] A rotor manufacturing apparatus for solving the above problems manufactures a rotor comprising: a cylindrical rotor core having a plurality of slots penetrating in the axial direction; a plurality of magnets housed in each of the slots; and a plurality of resin materials filling each of the slots to fix the magnets to the rotor core. The rotor manufacturing apparatus comprises: a plurality of plungers for pushing the plurality of resin materials toward the plurality of slots; and a drive unit that supports the plurality of plungers and is configured to move back and forth relative to the rotor core. The drive unit has a plurality of housings that house each of the plungers so that they can move relative to the drive unit in the direction of movement, and a biasing unit that biases the plungers from inside the housings in the direction of pushing out the resin materials.

[0008] According to the above configuration, as the drive unit moves toward the rotor core, each plunger is pressed against each resin material. This pushes the resin material toward the slots, thereby filling the slots. Here, each plunger is housed in a housing so as to be able to move relative to it in the forward and backward direction of the drive unit, and is biased in the pushing direction from inside the housing by a biasing unit. Therefore, when the force with which the drive unit presses the plunger against the resin material reaches a predetermined force, the plunger and the housing move relative to each other in the forward and backward direction. As a result, the amount of relative movement of each plunger relative to the housing differs depending on the volume of the resin material. Consequently, the amount of resin material filling the slots by each plunger is adjusted according to the volume of the resin material. Therefore, overfilling of the slots with resin material can be suppressed. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view showing the rotor of the first embodiment. [Figure 2] Figure 2 is a cross-sectional view of the rotor shown in Figure 1. [Figure 3] Figure 3 is a cross-sectional view showing a rotor manufacturing apparatus according to the first embodiment. [Figure 4] Figure 4 is a cross-sectional view showing the intermediate plate in Figure 3 in contact with the Cal plate. [Figure 5] Figure 5 is a cross-sectional view showing the fixed mold and movable mold from Figure 3 in a clamped state. [Figure 6] Figure 6 is a cross-sectional view showing the state in which the resin material has been filled into the slot by the plunger unit shown in Figure 3. [Figure 7] Figure 7 is a cross-sectional view showing a rotor manufacturing apparatus according to the second embodiment. [Figure 8] Figure 8 is a plan view showing the base portion of Figure 7. [Figure 9] Figure 9 is a cross-sectional view showing the state in which the resin material has been filled into the slot by the plunger unit of Figure 7. [Figure 10] Figure 10 is a plan view showing the base of the modified example. [Modes for carrying out the invention]

[0010] <First Embodiment> A first embodiment of the rotor manufacturing apparatus will be described below with reference to Figures 1 to 6. First, the rotor 10 manufactured by the rotor manufacturing apparatus of this embodiment (hereinafter referred to as the manufacturing apparatus 40) will be described.

[0011] (Configuration of rotor 10) As shown in Figure 1, the rotor 10 comprises a rotor core 11, a plurality of magnets 20, and a plurality of resin materials 30. The rotor 10 is used, for example, in a magnet-embedded motor.

[0012] The rotor core 11 has a substantially cylindrical shape. The rotor core 11 is constituted by laminating a plurality of core pieces 12 punched out from electromagnetic steel sheets, for example. Hereinafter, the axial direction of the rotor core 11 will simply be referred to as the axial direction. Also, the radial direction of the rotor core 11 will simply be referred to as the radial direction. Further, the circumferential direction of the rotor core 11 will simply be referred to as the circumferential direction.

[0013] The rotor core 11 has a first end face 11a and a second end face 11b that are located on opposite sides in the axial direction. The rotor core 11 has a central hole 13 and a plurality of slots 14. A shaft (not shown) is inserted into the central hole 13. The plurality of slots 14 are formed at intervals in the circumferential direction on the outer peripheral portion of the rotor core 11. The central hole 13 and the slots 14 penetrate the rotor core 11 in the axial direction. That is, both the central hole 13 and the slots 14 open to the first end face 11a and the second end face 11b.

[0014] The central hole 13 has a substantially circular shape in a plan view. On the inner surface of the central hole 13, two keys 13a that project radially opposite to each other are provided. By fitting the two keys 13a into key grooves provided on a shaft (not shown), relative movement between the rotor core 11 and the shaft in the circumferential direction is restricted.

[0015] The cross-sectional shape of the slot 14 orthogonal to the axial direction is a substantially rectangular shape having a long side and a short side. The cross-sectional shape of the slot 14 is the same throughout the axial direction. The magnet 20 is, for example, a permanent magnet. One magnet 20 is accommodated in each slot 14. The magnet 20 is fixed to the rotor core 11 via a resin material 30 filled in the slot 14.

[0016] As shown in FIG. 2, the magnet 20 has an elongated shape that is long in the axial direction. The length of the magnet 20 in the axial direction is shorter than the length of the rotor core 11 in the axial direction. The cross-sectional shape of the magnet 20 perpendicular to the axial direction is substantially rectangular.

[0017] One end face of the magnet 20 in the axial direction is located, for example, inside the first end face 11a in the axial direction. The other end face on the opposite side of the one end face of the magnet 20 in the axial direction is flush with, for example, the second end face 11b.

[0018] The resin material 30 is, for example, a thermosetting resin. The resin material 30 is filled over the entire circumference of the magnet 20 between the inner surface of the slot 14 and the outer surface of the magnet 20. The resin material 30 covers one end face of the magnet 20 in the axial direction and is formed flush with the first end face 11a of the rotor core 11.

[0019] (Overall configuration of the manufacturing apparatus 40) Next, the configuration of the manufacturing apparatus 40 will be described. As shown in FIG. 3, the manufacturing apparatus 40 is an apparatus for filling the resin material 30 (see FIG. 4) into each slot 14 of the rotor core 11 and curing it. The manufacturing apparatus 40 includes a support jig 50, a cal plate 60, a fixed mold 70, and a movable mold 71.

[0020] The support jig 50 supports the second end face 11b of the rotor core 11 from below. The cal plate 60 is disposed on the first end face 11a of the rotor core 11. The fixed mold 70 supports the support jig 50 from below. The movable mold 71 is disposed above the fixed mold 70. The movable mold 71 is configured to be able to move forward and backward in the vertical direction with respect to the fixed mold 70. The fixed mold 70 and the movable mold 71 are configured to be able to clamp the support jig 50, the rotor core 11, and the cal plate 60 in the axial direction, that is, in the vertical direction, for mold clamping.

[0021] (Configuration of the support jig 50) The support jig 50 includes a base plate 51, a post 52, and a spacer 54. The base plate 51 is flat. The post 52 protrudes upward from the center of the base plate 51. The spacer 54 is superimposed on the upper surface of the base plate 51 and supports the second end face 11b of the rotor core 11.

[0022] The base plate 51 has a plurality of through holes 51a that penetrate in the thickness direction. The plurality of through holes 51a are spaced apart from each other so as to surround the post 52. The post 52 is cylindrical. The post 52 passes through the spacer 54. The post 52 is inserted into the central hole 13 of the rotor core 11. The outer circumferential surface of the post 52 is provided with a keyway (not shown) into which the key 13a (see Figure 1) of the rotor core 11 engages. The engagement of the key 13a with the keyway positions the rotor core 11 relative to the support jig 50. Multiple positioning pins 53 are provided on the tip surface of the post 52.

[0023] The spacer 54 is flat. The spacer 54 has a central hole 54a into which the post 52 is inserted. Although not shown in the figures, the spacer 54 is provided to move up and down along the post 52 by a lifting mechanism that moves up and down within the through hole 51a of the base plate 51. When the spacer 54 rises relative to the post 52, the rotor core 11 is removed from the support jig 50.

[0024] (Composition of Calplate 60) The Calplate 60 has a plurality of filling pots 61, each corresponding to a slot 14. Pellet-shaped resin material 30 is placed in the filling pots 61 (see Figure 4).

[0025] The filling pot 61 has a runner portion 62 and a communication hole 63. The runner portion 62 opens to the upper surface of the cal plate 60. The communication hole 63 opens to the bottom surface of the runner portion 62 and penetrates the cal plate 60 in the thickness direction. The communication hole 63 connects the runner portion 62 and the slot 14.

[0026] The Calplate 60 has a recess 64 and a positioning hole 65. The recess 64 opens on the lower surface of the central part of the Calplate 60. The positioning hole 65 opens on the top surface of the recess 64 and penetrates the Calplate 60 in the thickness direction.

[0027] The tip of the post 52 is inserted into the recess 64. The positioning pin 53 of the post 52 is inserted into the positioning hole 65. By inserting the positioning pin 53 into the positioning hole 65, the calplate 60 is positioned relative to the support jig 50 and the rotor core 11. This connects the filling pot 61 and the slot 14.

[0028] (Configuration of the movable type 71) The movable type 71 comprises a plunger unit 72, a pressure plate 73, and an intermediate plate 74.

[0029] (Configuration of plunger unit 72) The plunger unit 72 comprises a plurality of plungers 80 and a drive unit 90. The plunger unit 72 has the same number of plungers 80 as the filling pot 61. The drive unit 90 supports the plurality of plungers 80 and is configured to move back and forth relative to the rotor core 11. The plurality of plungers 80 move back and forth relative to the rotor core 11 together with the drive unit 90. The plurality of plungers 80 are pressed against the resin material 30 by the drive unit 90, thereby pushing the plurality of resin materials 30 placed in the filling pot 61 of the calplate 60 toward the plurality of slots 14. The plurality of plungers 80 have the same shape and size.

[0030] The plunger 80 has a first pin 81 and a second pin 84 connected to the lower end of the first pin 81. The first pin 81 and the second pin 84 are arranged coaxially. The first pin 81 has a first body portion 82 and a first flange portion 83. The first body portion 82 is cylindrical and extends in the vertical direction. The first flange portion 83 is widened in diameter towards the outer circumference of the first body portion 82 at the upper end of the first body portion 82.

[0031] The second pin 84 has a second body portion 85 and a second flange portion 86. The second body portion 85 is cylindrical and extends in the vertical direction. The second body portion 85 is longer in the vertical direction than the first body portion 82. The second flange portion 86 is widened in diameter on the outer circumference side of the second body portion 85 at its upper end. The lower end of the first body portion 82 is connected to the second flange portion 86.

[0032] The drive unit 90 comprises a base unit 91 and a cover 99. The base unit 91 has a plurality of housing units 92 that house each plunger 80 so that it can move relative to the drive unit 90 in the direction of advancement and retraction, i.e., in the vertical direction. The housing units 92 penetrate the base unit 91 in the vertical direction. The cover 99 is fixed to the upper surface of the base unit 91 so as to cover the upper opening of each housing unit 92.

[0033] The housing section 92 has a first large-diameter section 93, a first small-diameter section 94, a second large-diameter section 95, and a second small-diameter section 96, all arranged coaxially. The cross-sectional shape of the first large-diameter section 93, the first small-diameter section 94, the second large-diameter section 95, and the first small-diameter section 94 is circular. Multiple housing sections 92 have the same shape and size.

[0034] The first large-diameter portion 93 opens onto the upper surface of the base portion 91. The first flange portion 83 of the first pin 81 is housed in the first large-diameter portion 93. The diameter of the first large-diameter portion 93 is approximately the same as the diameter of the first flange portion 83. The vertical dimension of the first large-diameter portion 93 is larger than the vertical dimension of the first flange portion 83.

[0035] The first small-diameter portion 94 communicates with the lower part of the first large-diameter portion 93. The first main body portion 82 of the first pin 81 is housed in the first small-diameter portion 94. The diameter of the first small-diameter portion 94 is smaller than the diameter of the first large-diameter portion 93 and is approximately the same as the diameter of the first main body portion 82. The vertical dimension of the first small-diameter portion 94 is smaller than the vertical dimension of the first main body portion 82.

[0036] The second large-diameter portion 95 communicates with the lower part of the first small-diameter portion 94. The second flange portion 86 of the second pin 84 is housed in the second large-diameter portion 95. The diameter of the second large-diameter portion 95 is larger than the diameter of the first small-diameter portion 94 and is approximately the same as the diameter of the second flange portion 86. For example, the diameter of the second large-diameter portion 95 is the same as the diameter of the first large-diameter portion 93. The vertical dimension of the second large-diameter portion 95 is larger than the vertical dimension of the second flange portion 86.

[0037] The second small-diameter portion 96 communicates with the lower part of the second large-diameter portion 95 and opens to the lower surface of the base portion 91. The second main body portion 85 of the second pin 84 is housed in the second small-diameter portion 96. The diameter of the second small-diameter portion 96 is smaller than the diameter of the second large-diameter portion 95 and is approximately the same as the diameter of the second main body portion 85. The diameter of the second small-diameter portion 96 is, for example, the same as the diameter of the first small-diameter portion 94. The vertical dimension of the second small-diameter portion 96 is smaller than the vertical dimension of the second main body portion 85. The second main body portion 85 protrudes downward from the second small-diameter portion 96 to the base portion 91.

[0038] The housing section 92 has a support section 97 that supports the plunger 80 from below. The support section 97 is composed of the bottom wall of the first large-diameter section 93, through which the first small-diameter section 94 opens, and the bottom wall of the second large-diameter section 95, through which the second small-diameter section 96 opens. The bottom wall of the first large-diameter section 93 contacts the first flange section 83 from below. The bottom wall of the second large-diameter section 95 contacts the second flange section 86 from below. In this way, the plunger 80 is supported by the drive section 90.

[0039] The drive unit 90 has a biasing unit 100 that biases the plunger 80 from inside the housing unit 92 in the direction of pushing out the resin material 30. The biasing unit 100 is composed of a plurality of compression coil springs 101 housed in each housing unit 92. The plurality of compression coil springs 101 have the same spring constant. The compression coil springs 101 are housed in the first large diameter unit 93. The upper end of each compression coil spring 101 is in contact with the lower surface of the cover 99. The lower end of each compression coil spring 101 is in contact with the upper surface of the first flange unit 83.

[0040] The biasing part 100 presses the first flange portion 83 against the bottom wall of the first large diameter portion 93, i.e., the support portion 97. The biasing part 100 also presses the second flange portion 86 against the bottom wall of the second large diameter portion 95, i.e., the support portion 97.

[0041] The housing section 92 has a restricting section 98 that restricts the relative movement of the plunger 80 by contacting the plunger 80 from the opposite side when the plunger 80 moves relative to the drive section 90 in the opposite direction to the direction in which the resin material 30 is extruded. The restricting section 98 is composed of the top wall of the second large diameter section 95, from which the first small diameter section 94 opens. In other words, when the plunger 80 and the drive section 90 move relative to each other, the top wall of the second large diameter section 95 and the second flange section 86 come into contact in the vertical direction, thereby restricting the relative movement. In this embodiment, the plunger 80 and the drive section 90 move relative to each other as the drive section 90 moves downward while compressing the compression coil spring 101 relative to the plunger 80, which is pressed against the resin material 30. Therefore, the restricting section 98 contacts the plunger 80 from above when the drive section 90 moves downward relative to the plunger 80.

[0042] (Composition of pressure plate 73) The pressure plate 73 is located below the drive unit 90. The pressure plate 73 is connected to the plunger unit 72 so as to be movable in the vertical direction relative to it. The pressure plate 73 is subjected to a clamping force for clamping the fixed mold 70 and the movable mold 71. The pressure plate 73 has a plurality of first through holes 73a into which a plurality of plungers 80 are each inserted. The first through holes 73a penetrate the pressure plate 73 in the thickness direction.

[0043] (Configuration of the intermediate plate 74) The intermediate plate 74 is positioned below the pressure plate 73. The intermediate plate 74 is connected to the pressure plate 73 so as to be movable relative to it in the vertical direction.

[0044] The intermediate plate 74 has multiple second through holes 74a into which multiple plungers 80 are each inserted. The second through holes 74a penetrate the intermediate plate 74 in the thickness direction. The second through holes 74a are provided at positions corresponding to the first through holes 73a.

[0045] The second through-hole 74a accommodates the resin material 30 placed in the filling pot 61 of the Calplate 60 (see Figure 5). The second through-hole 74a communicates with the slot 14 via the filling pot 61 of the Calplate 60 when the fixed mold 70 and the movable mold 71 are clamped together.

[0046] (Manufacturing procedure for rotor 10) Next, the manufacturing procedure for the rotor 10 using the manufacturing apparatus 40 will be described. As shown in Figure 3, during the manufacturing of the rotor 10, the magnets 20 are first housed in the slots 14 of the rotor core 11, which is supported by a support jig 50.

[0047] Next, the Calplate 60 is placed on the first end face 11a of the rotor core 11. At this time, the positioning pin 53 is inserted into the positioning hole 65. Next, the support jig 50 is placed in a heating device (not shown), thereby preheating the support jig 50, rotor core 11, and calplate 60 to a predetermined temperature. The fixed type 70 and movable type 71 are also preheated to a predetermined temperature.

[0048] Next, the support jig 50, rotor core 11, and calplate 60 are positioned between the fixed type 70 and the movable type 71. As shown in Figure 4, the movable type 71 then descends, causing the intermediate plate 74 to come into contact with the upper surface of the cal plate 60.

[0049] Subsequently, pelletized resin material 30 is placed in each filling pot 61 through each second through-hole 74a. The resin material 30 placed in the filling pot 61 melts due to the heat from the preheating.

[0050] As shown in Figure 5, the plunger unit 72 and the pressure plate 73 then descend, causing the pressure plate 73 to contact the upper surface of the intermediate plate 74. A clamping force is then applied to the pressure plate 73. As a result, the fixed mold 70 and the movable mold 71 clamp the support jig 50, the rotor core 11, and the cal plate 60 in the vertical direction.

[0051] As shown in Figure 6, the plunger unit 72 then descends, pressing each plunger 80 against each molten resin material 30. At this time, when the force applied by the drive unit 90 to press the plunger 80 against the resin material 30 reaches a predetermined force, the drive unit 90 descends against the plunger 80 against the biasing force of the biasing unit 100, i.e., the biasing force of the compression coil spring 101. As a result, the first flange portion 83 and the second flange portion 86 of the plunger 80 separate from the support portion 97. The resin material 30 is pressurized inside the filling pot 61 by the plunger 80, and the resin material 30 is filled into the slot 14 via the filling pot 61. The resin material 30 filled into the slot 14 solidifies as it is heated by the heat of the preheating. As a result, the magnet 20 is fixed to the rotor core 11.

[0052] Next, the fixed mold 70 and the movable mold 71 are separated, causing the movable mold 71 to move away from the calplate 60. Then, the calplate 60 is removed from the manufacturing apparatus 40, and the rotor 10 is removed from the support jig 50.

[0053] The rotor 10 is manufactured in the manner described above. <Operation and Effects of This Embodiment> (1-1) The manufacturing apparatus 40 comprises a plurality of plungers 80 and a drive unit 90. The plurality of plungers 80 extrude a plurality of resin materials 30 toward a plurality of slots 14. The drive unit 90 supports the plurality of plungers 80 and is configured to move forward and backward relative to the rotor core 11. The drive unit 90 has a plurality of housing sections 92 and a biasing section 100. Each housing section 92 houses each plunger 80 so that it can move relative to the drive unit 90 in the direction of movement. The biasing section 100 biases the plungers 80 from inside the housing section 92 in the direction of extruding the resin material 30.

[0054] According to the above configuration, as the drive unit 90 moves toward the rotor core 11, each plunger 80 is pressed against each resin material 30. This pushes the resin material 30 toward the slot 14, thereby filling the slot 14 with resin material 30. Here, each plunger 80 is housed in the housing 92 so as to be movable relative to the drive unit 90 in the forward and backward direction, and is biased in the pushing direction from inside the housing 92 by the biasing unit 100. Therefore, when the force with which the drive unit 90 presses the plunger 80 toward the resin material 30 reaches a predetermined force, the plunger 80 and the housing 92 move relative to each other in the forward and backward direction. As a result, the amount of relative movement of each plunger 80 relative to the housing 92 differs according to the volume of resin material 30. Consequently, the amount of resin material 30 filling the slot 14 by each plunger 80 is adjusted according to the volume of resin material 30. Therefore, overfilling of the slot 14 with resin material 30 can be suppressed.

[0055] (1-2) The biasing section 100 is composed of a plurality of compression coil springs 101 housed in each housing section 92. According to the above configuration, by housing the compression coil spring 101 inside each housing section 92, the biasing section 100 can be realized with a simple structure.

[0056] (1-3) Each housing section 92 has a restricting section 98 that restricts the relative movement of the plunger 80 by contacting the plunger 80 from the opposite side when the plunger 80 moves relative to the housing section 92 in the opposite direction to the pushing direction.

[0057] According to the above configuration, when the plunger 80 is pressed against the resin material 30 and moves relative to the drive unit 90 in the opposite direction to the extrusion direction of the resin material 30, the regulating unit 98 restricts the relative movement of the plunger 80 with respect to the drive unit 90. As a result, the amount of compression of the compression coil spring 101 housed in the housing unit 92 is limited, and over-compression of the compression coil spring 101 can be suppressed. Therefore, deterioration of the compression coil spring 101 can be suppressed.

[0058] <Second Embodiment> The second embodiment of the rotor manufacturing apparatus will be described below, focusing on the differences from the first embodiment, with reference to Figures 7 to 9.

[0059] In the second embodiment, the same reference numerals are used for components identical to those in the first embodiment, thereby omitting redundant explanations. As shown in Figure 7, the manufacturing apparatus 140 of the second embodiment differs from that of the first embodiment in the configuration of the biasing unit 110. The manufacturing procedure for the rotor 10 using the manufacturing apparatus 140 is the same as that of the first embodiment.

[0060] The biasing unit 110 consists of a single oil chamber 111 that applies hydraulic pressure to each of the multiple plungers 80. The oil chamber 111 is formed inside the drive unit 190. The oil chamber 111 is filled with oil.

[0061] As shown in Figure 8, the oil chamber 111 has a plurality of storage compartments 92 and a plurality of connecting passages 112 that connect the plurality of storage compartments 92 to each other. The plurality of storage compartments 92 are arranged in a circular shape on the base portion 191. Each connecting passage 112 extends in a straight line and connects two adjacent storage compartments 92 in the circumferential direction. The plurality of connecting passages 112 have the same shape and size.

[0062] As shown in Figure 7, the connecting passage 112 is a groove that opens onto the upper surface of the base portion 191. The connecting passage 112 connects two adjacent first large-diameter portions 93 in the circumferential direction. The openings of the oil chamber 111, i.e., the openings of each housing portion 92 and each connecting passage 112, are closed by the cover 99. The oil chamber 111 is sealed and does not communicate with the outside of the drive unit 190.

[0063] As shown by the dashed line in Figure 7, the connecting passage 112 is located on the opposite side of the end of the plunger 80 from the direction of extrusion when the plunger 80 is in contact with the regulating portion 98. In other words, the connecting passage 112 is located above the first pin 81 when the second flange portion 86 of the second pin 84 is in contact with the regulating portion 98.

[0064] A sealing member (not shown) is provided between the upper surface of the base portion 191 and the lower surface of the cover 99, and between the outer circumferential surface of the first pin 81 and the inner circumferential surface of the housing portion 92, respectively, to suppress oil leakage from the oil chamber 111.

[0065] As shown in Figure 9, when the force applied by the drive unit 190 to press the plunger 80 against the resin material 30 reaches a predetermined force, the drive unit 190 descends relative to the plunger 80 against the biasing force of the biasing unit 110, i.e., the force based on the hydraulic pressure of the oil chamber 111. As a result, the first flange portion 83 and the second flange portion 86 of the plunger 80 separate from the support portion 97.

[0066] <Operation and Effects of This Embodiment> (2-1) The biasing unit 110 is composed of a single oil chamber 111 that applies hydraulic pressure to a plurality of plungers 80. The oil chamber 111 has a plurality of housing sections 92 and a plurality of connecting passages 112 that connect the plurality of housing sections 92 to each other.

[0067] According to the above configuration, multiple plungers 80 are biased by a single oil chamber 111. Therefore, the biasing force acting on each plunger 80 can be easily adjusted. Consequently, overfilling of the resin material 30 into the slot 14 can be easily suppressed.

[0068] (2-2) Each housing section 92 has a restricting section 98 that restricts the relative movement of the plunger 80 by contacting the plunger 80 from the opposite side when the plunger 80 moves relative to the housing section 92 in the opposite direction to the pushing direction. The connecting passage 112 is located on the opposite side of the end of the plunger 80 that is in contact with the restricting section 98 when the plunger 80 is in contact with the restricting section 98.

[0069] According to the above configuration, when the plunger 80 is pressed against the resin material 30, and the plunger 80 moves relative to the drive unit 190 in the direction opposite to the direction of extrusion of the resin material 30, the restricting unit 98 restricts the relative movement of the plunger 80 with respect to the drive unit 190. Here, the connecting passage 112 is located on the opposite side of the end of the plunger 80 that is opposite to the direction of extrusion when the plunger 80 is in contact with the restricting unit 98. Therefore, when the plunger 80 comes into contact with the restricting unit 98, it is possible to prevent the connecting passage 112 from being blocked by the plunger 80. Thus, it is possible to prevent the function of the biasing unit 110 from being impaired.

[0070] <Example of changes> This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0071] In the second embodiment, as shown in Figure 10, the biasing unit 110 may have a plurality of oil chambers 111 that apply hydraulic pressure to at least two of the plurality of plungers 80. In this case, the oil chamber 111 has at least two housing sections 92 and at least one communication passage 112 that connects the at least two housing sections 92 to each other. With this configuration, since the plungers 80 housed in at least two housing sections 92 are biased by a common oil chamber 111, the biasing force acting on the at least two plungers 80 can be easily adjusted.

[0072] In the second embodiment, the drive unit 190 may have a biasing unit 100 of the first embodiment, in addition to a biasing unit 110 which consists of an oil chamber 111 that applies hydraulic pressure to at least two of the plurality of plungers 80, and which biases the remaining plungers 80.

[0073] In the second embodiment, the biasing unit 110 may bias the multiple plungers 80 by air pressure instead of hydraulic pressure. Each housing section 92 does not necessarily have a regulating section 98. In this case, in the first embodiment, it is preferable to set the range of movement of the drive unit 90 so that overcompression of the compression coil spring 101 does not occur. In the second embodiment, it is preferable to set the range of movement of the drive unit 190 so that the communication passage 112 is not blocked by the plunger 80.

[0074] In the first embodiment, the biasing unit 100 may be composed of multiple leaf springs or multiple gas springs instead of multiple compression coil springs 101. In each embodiment, the plunger unit 72 may have fewer plungers 80 than the number of slots 14. In this case, for example, each filling pot 61 may have multiple communication holes 63 that communicate with multiple slots 14.

[0075] In each embodiment, the plunger unit 72 may be configured to fill the slot 14 with resin material 30 by approaching the rotor core 11 from below. In each embodiment, the resin material 30 may be a thermoplastic resin.

[0076] In each embodiment, the support portion 97 may be composed of either the bottom wall of the first large-diameter portion 93 or the bottom wall of the second large-diameter portion 95. [Explanation of Symbols]

[0077] 10…Rota 11…Rotor core 14…Slot 20…Magnets 30… Resin material 40,140…Manufacturing equipment 72... Plunger Unit 80... Plunger 90,190… Drive unit 92...Detention Unit 98... Regulatory Department 100... biasing part 101... Compression coil spring 110... biasing part 111…Oil room 112…Communication path

Claims

1. A rotor manufacturing apparatus for manufacturing a rotor comprising a cylindrical rotor core having a plurality of slots penetrating in the axial direction, a plurality of magnets housed in each of the slots, and a plurality of resin materials filling each of the slots to fix the magnets to the rotor core, Multiple plungers for pushing the multiple resin materials toward the multiple slots, It includes a drive unit that supports the plurality of plungers and is configured to move back and forth relative to the rotor core, The aforementioned drive unit is A plurality of housings that house each of the plungers so as to be movable relative to the drive unit in the forward and backward direction, The housing portion includes a biasing portion that biases the plunger in the direction of extruding the resin material from inside the housing portion. Rotor manufacturing equipment.

2. The biasing section is composed of a plurality of compression coil springs housed in each of the housing sections. A rotor manufacturing apparatus according to claim 1.

3. Each of the housings has a restricting portion that restricts the relative movement of the plunger by contacting the plunger from the opposite side when the plunger moves relative to the drive unit in the direction opposite to the pushing direction. A rotor manufacturing apparatus according to claim 2.

4. The biasing unit is composed of an oil chamber that applies hydraulic pressure to at least two of the plurality of plungers, The oil chamber has at least two of the plurality of storage sections and a communication passage connecting the at least two storage sections. A rotor manufacturing apparatus according to claim 1.

5. The biasing unit is composed of a single oil chamber that applies hydraulic pressure to the plurality of plungers, The oil chamber has a plurality of storage compartments and a plurality of connecting passages that connect the plurality of storage compartments. A rotor manufacturing apparatus according to claim 4.

6. Each of the housing sections has a restricting section that restricts the relative movement of the plunger by contacting the plunger from the opposite side when the plunger moves relative to the drive section in the direction opposite to the pushing direction, The connecting passage is located on the opposite side of the opposite end of the plunger when the plunger is in contact with the restricting portion. A rotor manufacturing apparatus according to claim 4 or claim 5.

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