JP2016042766A - Rotor structure for liquid pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress increase in the number of components while maintaining the detent state of a bearing.SOLUTION: In a rotor, a bearing 62 is formed integrally with a rotor core and an impeller by a resin mold. Consequently, the bearing 62 can be integrated with the rotor core and impeller, without using other member such as a collar member. Consequently, increase in the number of component can be suppressed in a rotor 52. Furthermore, plane parts 66 are formed in three places on the outer peripheral side surfaces 62B1 at a flange 62B of the bearing 62, and the plane part 66 is formed in a direction perpendicular to the radial direction of the flange 62B, when viewing from the axial direction of the bearing 62. Since the outer peripheral side surface 62B1 of the flange 62B, when viewing from the axial direction of the bearing 62, has a noncircular shape, the plane part 66 functions as a detent of the bearing 62 for a resin mold 60. Consequently, detent state of the bearing 62 can be maintained.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotor structure for a liquid pump.

  In the rotor structure of the electric pump (liquid pump) described in Patent Document 1 below, the rotor assembly includes a rotor core, a collar member, and a bearing member. Specifically, the engagement protrusion of the collar member is engaged in the engagement recess of the rotor core, and the collar member is assembled to the rotor core so as not to be relatively rotatable. Further, the convex portion of the bearing member is fitted into the concave portion of the collar member, and the bearing member is assembled to the collar member so as not to be relatively rotatable. The rotor assembly and the impeller member are integrated with a resin material. Thus, the bearing member is configured to be rotatable integrally with the rotor core and the impeller.

JP 2014-84846 A

  However, in the rotor structure of the electric pump, as described above, the bearing member is connected to the rotor core via the collar member so as not to be relatively rotatable, and is further integrated with the impeller via the resin member. For this reason, in the rotor structure of the said electric pump, there exists a problem that a number of parts increases. Accordingly, it is desirable that the rotor structure of the electric pump has a structure that suppresses the increase in the number of parts while maintaining the rotation prevention state of the bearing portion.

  In view of the above facts, an object of the present invention is to provide a rotor structure for a liquid pump that can suppress an increase in the number of parts while maintaining a rotation-preventing state of a bearing.

  The rotor structure for a liquid pump of the present invention is formed in a cylindrical shape with an impeller that pumps the liquid in the pump section by rotating, and is disposed coaxially with the rotation shaft of the impeller, and the rotor magnet is axially disposed. A rotor core to be embedded, and a non-rotating portion disposed coaxially on the radially inner side of the rotor core and provided integrally with the impeller and the rotor core by a resin mold portion to prevent relative rotation with respect to the resin mold portion. And a bearing having the same.

  According to the liquid pump rotor structure configured as described above, the bearing is coaxially arranged on the radially inner side of the rotor core, and the rotor core, the bearing, and the impeller are integrally provided by the resin mold portion. For this reason, a bearing can be integrated with both using the resin mold part which integrates a rotor core and an impeller. As a result, it is not necessary to use other members such as a collar member as in the prior art, and an increase in the number of parts can be suppressed.

  In addition, the bearing has a rotation preventing portion, and the rotation preventing portion prevents relative rotation with respect to the resin mold portion. For this reason, even if the state in which the bearing and the resin mold portion are integrated is released, the rotation of the bearing relative to the resin mold portion can be prevented by the rotation preventing portion. As described above, it is possible to suppress an increase in the number of parts while maintaining the rotation prevention state of the bearing.

  In the rotor structure for a liquid pump of the present invention, in addition to the above-described configuration, the rotation preventing portion is a plurality of flat portions formed on the outer peripheral side surface of the bearing, and the flat portion extends from the axial direction of the bearing. It is formed along the direction intersecting the radial direction of the bearing as viewed.

  According to the rotor structure for a liquid pump having the above configuration, the shape of the outer peripheral side surface of the bearing viewed from the axial direction of the bearing can be made noncircular. Thereby, relative rotation of the bearing with respect to the resin mold part can be prevented with a simple configuration.

  In the liquid pump rotor structure of the present invention, in addition to the above configuration, the bearing is made of a resin material, and a gate that is an inlet of a molten resin when the bearing is molded is set on the flat portion. Has been.

  According to the rotor structure for a liquid pump having the above-described structure, the gate that is the inlet of the molten resin when the bearing is molded is set on the flat surface portion. Can be set using.

  In addition to the above configuration, the rotor structure for a liquid pump of the present invention is configured such that the bearing includes a cylindrical main body portion and a flange portion protruding radially outward from the main body portion. The rotation preventing portion is formed on the outer peripheral side surface of the flange portion.

  According to the rotor structure for a liquid pump having the above configuration, the bearing includes a main body portion formed in a cylindrical shape and a flange portion that protrudes radially outward from the main body portion. And the detent | locking part is formed in the outer peripheral side surface of a flange part. For this reason, the distance from the shaft center of the bearing to the rotation stopper can be set large. Thereby, even if a comparatively big rotational torque arises when an impeller rotates, the rotation prevention state with respect to the resin mold part of a bearing can be maintained effectively.

(A) is a top view which shows the bearing which comprises a part of rotor to which the rotor structure for liquid pumps concerning this Embodiment is applied, (B) is a longitudinal cross-section of the bearing shown by (A) It is a figure (1B-1B sectional view taken on the line of FIG. 1 (A)). It is a longitudinal cross-sectional view which shows the whole water pump using the rotor to which the rotor structure for liquid pumps concerning this Embodiment was applied. It is a longitudinal cross-sectional view which expands and shows the rotor and impeller shown by FIG. FIG. 4 is a plan cross-sectional view (a cross-sectional view taken along line 4-4 in FIG. 3) of the rotor shown in FIG.

  Hereinafter, the water pump 10 as a “liquid pump” including the rotor 52 to which the liquid pump rotor structure S according to the present embodiment is applied will be described with reference to the drawings.

  The water pump 10 according to the present embodiment is used as a pump for pumping cooling water (liquid) for an air conditioner heater of a vehicle (automobile), for example. As shown in FIG. 2, the water pump 10 includes a pump unit 12 that accommodates the impeller 70 and pumps cooling water, and a motor unit 50 that rotates the impeller 70. Further, the water pump 10 includes a motor housing 30 (which is an element grasped as a “housing” in a broad sense) that houses the motor unit 50, and a circuit device 90 for driving and controlling the motor unit 50. ing.

  Hereinafter, each said structure is demonstrated in order of the pump part 12, the motor housing 30, the motor part 50, and the circuit apparatus 90. FIG. The water pump 10 is formed in a substantially cylindrical shape as a whole, and in the following description, the arrow A direction (one side in the axial direction of the water pump 10) appropriately shown in the drawings is the upper side, and the arrow B direction is the lower side. It is said.

(About the pump unit 12)
As shown in FIG. 2, the pump unit 12 constitutes the upper part of the water pump 10. The pump unit 12 includes a pump case 14, and the pump case 14 constitutes an outer peripheral portion of the pump unit 12. The pump case 14 has a case main body portion 16, and the case main body portion 16 is formed in a substantially bottomed cylindrical shape opened downward. An impeller accommodating portion 18 that accommodates an impeller 70 to be described later is formed in the center portion of the case body portion 16, and the impeller accommodating portion 18 is formed in a substantially concave shape that is opened downward. Further, a flow path 20 is formed inside the case main body portion 16 on the radially outer side of the case main body portion 16 with respect to the impeller housing portion 18. The flow path 20 is formed in a substantially U-shaped cross section that is open downward, and extends along the circumferential direction of the case body 16.

  In addition, an inlet pipe 22 is integrally formed on the upper wall of the case main body 16 at the center (the axial center of the water pump 10). The inlet pipe 22 is formed in a tubular shape and extends upward from the case body 16. In addition, the inlet pipe 22 communicates with the impeller accommodating portion 18 so that cooling water flows from the inlet pipe 22 into the case main body portion 16.

  Further, an outlet pipe (not shown) is integrally formed on the outer peripheral portion of the case main body 16. The outlet pipe is formed in a tubular shape and extends from the side wall of the case main body 16 in a direction orthogonal to the axis of the water pump 10. The outlet pipe communicates with the flow path 20 so that the cooling water that has flowed into the case body 16 flows out of the outlet pipe.

  A pump-side flange portion 26 is integrally formed at the open end portion of the case body portion 16, and the pump-side flange portion 26 projects from the case body portion 16 to the outside in the radial direction of the case body portion 16. At the same time, it is formed in a substantially ring shape over the entire circumference of the case body 16. A substantially cylindrical rib 26A is erected on the lower surface of the pump-side flange portion 26. The rib 26A is formed over the entire circumference of the case main body portion 16, and extends downward from the pump-side flange portion 26. It is protruding.

(About motor housing 30)
As shown in FIG. 2, the motor housing 30 constitutes an intermediate portion in the vertical direction of the water pump 10 and is disposed on the lower side with respect to the pump portion 12. The motor housing 30 is formed in a substantially bottomed cylindrical shape that is opened downward as a whole, and is arranged coaxially with the inlet pipe 22 (the axis of the water pump 10). Specifically, the motor housing 30 has an outer cylindrical portion 32 that constitutes a radially outer portion of the motor housing 30, and the outer cylindrical portion 32 is formed in a substantially bottomed cylindrical shape that is opened downward. ing. Further, the motor housing 30 has an inner cylinder portion 34 that constitutes a radially inner portion of the motor housing 30. The inner cylinder part 34 is formed in a substantially bottomed cylindrical shape opened upward, and the open end (upper end) of the inner cylinder part 34 is coupled to the bottom wall of the outer cylinder part 32.

  A space between the outer cylindrical portion 32 and the inner cylindrical portion 34 is a stator accommodating portion 36 for accommodating a stator 80 described later, and the stator accommodating portion 36 is a substantially annular shape opened downward. It is formed in the space. Furthermore, the space inside the inner cylinder part 34 is a rotor accommodating part 38 for accommodating the rotor 52 mentioned later.

  A first coupling portion 40 is integrally formed at the upper end portion of the outer cylinder wall 32 </ b> A constituting the outer peripheral portion of the outer cylinder portion 32. The first coupling portion 40 protrudes from the outer cylinder wall 32A to the outside in the radial direction of the motor housing 30, is formed in a substantially ring shape over the entire circumference of the outer cylinder wall 32A, and the pump-side flange portion 26 described above. They are arranged facing each other in the vertical direction. Further, a rib housing recess 40A is formed on the upper surface of the first coupling portion 40 at a position corresponding to the rib 26A of the pump-side flange portion 26 described above. 40 A of rib accommodating recessed parts are open | released upwards, and are formed in the annular | circular shape (ring shape) seeing from the axial direction of the motor housing 30. As shown in FIG. And the 1st coupling | bond part 40 and the pump side flange part 26 are couple | bonded in the state in which the rib 26A of the pump case 14 was accommodated in the rib accommodating recessed part 40A. Further, in this state, the bottom wall of the outer cylindrical portion 32 enters the pump case 14 and the pump case 14 and the rotor accommodating portion 38 are communicated with each other.

  On the other hand, a second coupling portion 42 is integrally formed at the lower end portion of the outer cylindrical wall 32A. The second coupling portion 42 projects from the outer cylinder wall 32A to the outside in the radial direction of the motor housing 30, and is formed in a predetermined shape over the entire circumference of the outer cylinder wall 32A. Further, an encircling wall 42 </ b> A is integrally formed on the lower surface of the second coupling portion 42 at the outer peripheral portion of the second coupling portion 42. The surrounding wall 42 </ b> A protrudes downward from the second coupling portion 42 and is formed in a frame shape over the entire circumference of the second coupling portion 42.

  Further, the second coupling portion 42 is integrally formed with a connector portion (not shown). The connector portion is formed in a substantially bottomed rectangular tube shape that is opened downward, and protrudes downward from the second coupling portion 42, and an external connector (not shown) is fitted into the connector portion. It has become so. Although not shown, the motor housing 30 is provided with a connector terminal connected to an external connector, and one end portion of the connector terminal is disposed inside the connector portion. Further, the connector terminal is bent into a predetermined shape, and the other end of the connector terminal extends downward from the motor housing 30 and is connected to a circuit board 96 described later.

  Further, a substantially cylindrical support portion 44 is integrally formed on the bottom wall of the inner cylinder portion 34 at the center portion. The support portion 44 is disposed coaxially with the inlet pipe 22 of the pump portion 12 and protrudes upward from the bottom wall of the inner cylinder portion 34. Further, a cylindrical rotation shaft 46 is provided in the inner cylinder portion 34, and the rotation shaft 46 is disposed coaxially with the support portion 44. The lower end portion of the rotation shaft 46 is fixedly supported by the support portion 44, and the rotation shaft 46 protrudes upward from the support portion 44.

(About motor unit 50)
As shown in FIG. 2, the motor unit 50 includes a rotor 52 and a stator 80. Hereinafter, the rotor 52 will be described first, and then the stator 80 will be described.

  The rotor 52 is formed in a substantially cylindrical shape as a whole, and is housed in the rotor housing portion 38 of the motor housing 30 on the radially outer side of the rotating shaft 46. 3 and 4, the rotor 52 includes a rotor core 54, a plurality of (four in this embodiment) rotor magnets 56, a rotor cover 58, a resin mold portion 60, and a bearing 62. And. The liquid pump rotor structure S, which is the main part of the present invention, is applied to the rotor 52.

  The rotor core 54 is composed of a plurality of steel plates punched in a substantially annular shape, and the steel plates are stacked in the vertical direction with the vertical direction being the thickness direction. The rotor core 54 is formed in a substantially cylindrical shape as a whole, and is disposed coaxially with the rotating shaft 46 (see FIG. 4). As shown in FIG. 4, the rotor core 54 is formed with a plurality of (four in this embodiment) hole portions 54 </ b> A penetrating in the vertical direction (the axial direction of the rotor core 54). The holes 54 </ b> A are formed in a substantially rectangular cross section with the direction perpendicular to the radial direction of the rotor core 54 as the longitudinal direction when viewed from the axial direction of the rotor core 54, and are equally spaced along the circumferential direction of the rotor core 54. (Every 90 °).

  Further, the rotor core 54 is formed with a pair of slits 54B at positions outside the hole 54A in the width direction (that is, eight slits 54B are formed in the present embodiment). The slit 54B is opened to the outside in the radial direction of the rotor core 54 and penetrates in the vertical direction.

  As shown in FIGS. 3 and 4, the rotor magnet 56 is configured as a neodymium magnet and is formed in a substantially rectangular column shape. The outer shape of the rotor magnet 56 viewed from the longitudinal direction is set to be slightly smaller than the outer shape of the hole 54A, and the rotor magnet 56 is inserted (inserted) into the hole 54A with the vertical direction as the longitudinal direction. ) Thereby, the rotor magnet 56 is embedded in the up-down direction (the axial direction of the rotor core 54) inside the rotor core 54. The surfaces of the rotor core 54 and the rotor magnet 56 described above are subjected to rust prevention treatment (for example, nickel plating or resin coating). Thereby, the corrosion prevention and rust prevention of the rotor core 54 and the rotor magnet 56 are enhanced.

  The rotor cover 58 is made of a SUS plate and has a substantially bottomed cylindrical shape opened upward. Specifically, the rotor cover 58 has a cylindrical portion 58A formed in a substantially cylindrical shape. The rotor cover 58 has a bottom wall portion 58B. The bottom wall portion 58B is formed in a substantially annular plate shape with the vertical direction being the plate thickness direction, and is formed at the lower end (on the one side in the axial direction) of the cylindrical portion 58A. End) to the inside in the radial direction of the cylindrical portion 58A (see FIG. 3). Then, the rotor core 54 is fitted (inserted) into the rotor cover 58, and the rotor cover 58 constitutes a part of the outline of the rotor 52. That is, the radially outer side surface of the rotor core 54 is covered from the radially outer side of the rotor 52 by the tubular portion 58A of the rotor cover 58, and the tubular portion 58A constitutes the radially outer portion of the rotor 52. Further, the radially outer portion of the lower surface of the rotor core 54 and the lower surface of the rotor magnet 56 are covered from the lower side by the bottom wall portion 58B of the rotor cover 58, and the bottom wall portion 58B constitutes the lower end portion of the rotor 52. . Although the rotor cover 58 is made of a SUS plate material, the rotor cover 58 may be made of a metal plate material that hardly corrodes.

  As shown in FIG. 3, the resin mold part 60 is integrally formed by insert molding with the rotor core 54 fitted in the rotor cover 58, and constitutes the outer surface of the rotor 52 together with the rotor cover 58. Specifically, the resin mold part 60 has a substantially cylindrical inner mold part 60A, and the inner mold part 60A is formed integrally with the rotor core 54 so as to cover the radially inner side surface of the rotor core 54. ing. Further, the lower end portion of the inner mold portion 60 </ b> A is bent outward in the radial direction of the rotor core 54, and is formed integrally with the distal end portion of the bottom wall portion 58 </ b> B of the rotor cover 58.

  Furthermore, the resin mold part 60 has an upper mold part 60B. The upper mold portion 60B extends from the upper end portion of the inner mold portion 60A to the outside in the radial direction of the rotor 52, and is formed in a substantially annular shape. The upper mold part 60 </ b> B is formed integrally with the upper surface of the rotor core 54 and the upper surface of the rotor magnet 56. Further, the radially outer end portion of the upper mold portion 60B is formed integrally with the upper end portion of the cylindrical portion 58A of the rotor cover 58, and the upper mold portion 60B closes the rotor cover 58. Thereby, the rotor core 54 and the rotor magnet 56 are covered with the rotor cover 58 and the resin mold part 60 in a state in which the liquid tightness of the joint part between the rotor cover 58 and the resin mold part 60 is ensured.

  The bearing 62 is provided on the radially inner side of the inner mold portion 60A (that is, the rotor core 54). The bearing 62 has a bearing main body 62A as a “main body portion”. The bearing body 62A is formed in a substantially cylindrical shape with the vertical direction as the axial direction, and is disposed coaxially with the rotor core 54. The inner diameter dimension of the bearing body 62A is set slightly smaller than the outer diameter dimension of the rotary shaft 46 described above.

  As shown in FIGS. 1A and 1B, the bearing 62 has a flange portion 62B. The flange portion 62B protrudes radially outward from the upper end portion (end portion on one side in the axial direction) of the bearing body 62A, and is formed in a substantially cylindrical shape. Further, a stepped portion 64 is formed on the outer peripheral edge portion of the upper surface of the flange portion 62B. The stepped portion 64 is formed over the entire circumference in the circumferential direction of the flange portion 62B, and the bearing 62 in a longitudinal sectional view. Are formed in a stepped shape that is open radially outward and upward. Specifically, the stepped portion 64 includes a bottom surface 64A disposed in parallel with the top surface of the flange portion 62B, and a side surface 64B extending upward from the radially inner end of the bottom surface 64A. . Thereby, the lower end part in the outer peripheral part of the flange part 62B is comprised so that it may protrude in the radial direction outer side of the flange part 62B with respect to the side surface 64B. Further, the bottom surface 64A is disposed at the substantially vertical center of the flange portion 62B. The surface extending downward from the radially outer end of the bottom surface 64A is the outer peripheral side surface 62B1 of the flange portion 62B.

  As shown in FIG. 1A, a plurality of (three in the present embodiment) plane portions 66 as anti-rotation portions are formed on the outer peripheral side surface 62B1 of the flange portion 62B. The flat portion 66 is formed along a direction orthogonal to the radial direction of the flange portion 62B when viewed from the axial direction of the bearing 62. In other words, when viewed from the axial direction of the bearing 62, a part of the outer peripheral side surface 62B1 of the flange portion 62B is cut out in a straight line, whereby the plane portion 66 is formed. And the plane part 66 is arrange | positioned at equal intervals (every 120 degrees) in the circumferential direction of the flange part 62B. Thereby, the shape of the outer peripheral side surface 62B1 of the flange portion 62B viewed from the axial direction of the bearing 62 is configured to be a non-circular shape.

  The bearing 62 is made of a resin material, and the bearing 62 is manufactured by injection molding the resin material. The flat portion 66 corresponds to the gate G that is an inlet of the molten resin when the bearing 62 is molded. That is, when the bearing 62 is formed, the gate G is arranged to face the flat portion 66 in the radial direction of the flange portion 62B. In FIG. 1A, a mold M for forming the bearing 62 is schematically shown.

  Further, as shown in FIG. 3, the bearing 62 is formed integrally with the rotor core 54 by the resin mold portion 60. That is, when the resin mold portion 60 is formed, the bearing 62 is inserted into a mold for forming the resin mold portion 60 together with the rotor core 54 fitted in the rotor cover 58, and the resin mold portion 60, the rotor core 54, The bearing 62 is integrally formed.

  In a state where the bearing 62 and the resin mold part 60 are integrally formed, the inner mold part 60A covers the outer peripheral side surface 62A1 of the bearing body 62A, and the bearing body 62A and the inner mold part 60A are integrally formed. ing. The upper mold portion 60B covers the lower surface of the flange portion 62B, the outer peripheral side surface 62B1, and the bottom surface 64A of the stepped portion 64, and the flange portion 62B and the upper mold portion 60B are integrally formed. That is, the lower portion of the outer peripheral portion of the flange portion 62B is sandwiched in the vertical direction by the upper mold portion 60B. Thereby, the bearing 62 and the rotor core 54 are comprised so that integral rotation is possible. The rotating shaft 46 is inserted into the bearing body 62 </ b> A, and the rotor 52 is configured to rotate around the axis of the rotating shaft 46.

  On the other hand, a connecting shaft portion 68 for connecting the resin mold portion 60 and the impeller 70 is integrally formed on the upper side of the resin mold portion 60. The connecting shaft portion 68 is formed in a substantially cylindrical shape, is disposed coaxially with the rotating shaft 46, and extends upward from the upper mold portion 60 </ b> B of the resin mold portion 60.

  A first disk portion 72 and a blade 74 constituting the impeller 70 are integrally formed at the upper end of the connecting shaft portion 68. The first disk portion 72 is formed in a substantially disk shape, and is disposed coaxially with the rotation shaft 46 with the plate thickness direction being the axial direction of the rotation shaft 46. The blade 74 projects upward from the first disk portion 72. Further, on the upper side of the blade 74, a second disk portion 76 constituting the impeller 70 is provided. The second disk portion 76 is formed in a substantially disk shape, is disposed so as to face the first disk portion 72 via the blade 74, and is integrally coupled to the blade 74.

  Next, the stator 80 will be described. As shown in FIG. 2, the stator 80 includes a stator core 82 formed in an annular shape and a winding 84 having conductivity, and is accommodated in the stator accommodating portion 36 of the motor housing 30. Yes. The stator core 82 is composed of a plurality of steel plates punched into a predetermined shape, and the steel plates are stacked in the vertical direction with the vertical direction being the thickness direction. The stator core 82 is formed with a plurality of tooth portions 82A extending outward in the radial direction of the stator core 82.

  Winding 84 is wound around tooth portion 82 </ b> A of stator core 82. Thereby, winding part 84A wound along the outer peripheral part of teeth part 82A is formed. A terminal portion of the winding 84 extends downward from the motor housing 30 (stator accommodating portion 36) and is connected to a circuit board 96 described later. An insulating member 85 is interposed between the winding portion 84A and the tooth portion 82A.

  The stator 80 is covered with a stator holder 86. The stator holder 86 is made of a steel plate and has a substantially bottomed cylindrical shape that is open downward. A circular arrangement hole 86 </ b> A is formed through the bottom wall of the stator holder 86 in the vertical direction. The stator 80 and the stator holder 86 are accommodated in the stator accommodating portion 36 in a state where the stator 80 is disposed (inserted) in the stator holder 86. In this state, the inner cylindrical portion 34 of the motor housing 30 is disposed inside the arrangement hole 86A.

  In addition, a holder-side flange portion 86 </ b> B is integrally formed at the open end (lower end) of the stator holder 86. The holder-side flange portion 86B extends from the open end (lower end) of the stator holder 86 to the radially outer side of the stator holder 86, and is located below the second coupling portion 42 of the motor housing 30 and inside the surrounding wall 42A. Is arranged.

(About the circuit device 90)
As shown in FIG. 2, the circuit device 90 constitutes a lower portion of the water pump 10 and is disposed on the lower side of the motor housing 30. The circuit device 90 includes a plate unit 92, a circuit board 96, and a circuit cover 98.

  The plate unit 92 is formed in a substantially disk shape and is disposed on the lower side with respect to the motor housing 30. The plate unit 92 includes a plate main body 93 made of a resin material, and a ring plate 94 made of a steel plate and formed in a substantially ring shape. The plate main body 93 and the ring plate 94 are integrally formed with the ring plate 94 disposed above the plate main body 93.

  Further, the ring plate 94 is disposed so as to face the holder side flange portion 86B of the stator holder 86 in the vertical direction, and the plate unit 92 is fastened and fixed to the holder side flange portion 86B at a position not shown.

  The ring plate 94 is integrally formed with a plurality of fixing pieces 94B for fixing a circuit board 96 to be described later. The fixed piece 94 </ b> B extends downward from the outer peripheral portion of the ring plate 94, and the distal end portion of the fixed piece 94 </ b> B is bent inward in the radial direction of the ring plate 94. A burring 94C for fastening a circuit board 96, which will be described later, is formed at the distal end of the fixed piece 94B. The burring 94C is formed in a substantially bottomed cylindrical shape that is opened downward.

  Further, a guide hole (not shown) is formed in the plate unit 92 so as to penetrate in the vertical direction, and the other end portion of the connector terminal and the terminal portion of the winding 84 are inserted into the guide hole. Yes.

  The circuit board 96 is formed in a substantially disc shape, and is disposed on the lower side of the plate unit 92 with the plate thickness direction being the vertical direction. A screw (not shown) is inserted into the burring 94C of the ring plate 94 described above, and the circuit board 96 is fixed to the plate unit 92 by the screw. A plurality of circuit elements 96A are mounted on the circuit board 96, and the other end of the connector terminal and the terminal of the winding 84 are connected.

  The circuit cover 98 is made of a steel plate and is formed in a substantially bottomed cylindrical shape opened upward. Further, a cover-side flange portion 98A is integrally formed at the open end (upper end) of the circuit cover 98, and the cover-side flange portion 98A protrudes radially outward of the circuit cover 98 from the open end of the circuit cover 98. In addition, it is formed over the entire circumference of the circuit cover 98. The circuit cover 98 covers the circuit board 96 and the plate unit 92 and closes the lower end portion of the motor housing 30. Specifically, the cover side flange portion 98A is disposed inside the surrounding wall 42A of the motor housing 30 and opposed to the holder side flange portion 86B of the stator holder 86, and is fastened to the holder side by a fastening member such as a screw (not shown). It is fastened and fixed to the flange portion 86B.

  Next, the operation and effect of the present embodiment will be described.

  In the water pump 10 configured as described above, the inside of the pump portion 12 (pump case 14) and the inside of the rotor housing portion 38 of the motor housing 30 are communicated with each other. An impeller 70 is accommodated in the impeller accommodating portion 18 of the pump case 14, and a rotor 52 of the motor unit 50 is accommodated in the rotor accommodating portion 38. Further, a stator 80 of the motor unit 50 is disposed outside the rotor 52 in the radial direction, and the stator 80 is accommodated in the stator accommodating portion 36 of the motor housing 30.

  Then, when the external connector is connected to the connector portion and electric power for driving and controlling the motor portion 50 is supplied from the external connector to the circuit device 90, the motor portion 50 is driven and the rotor 52 of the motor portion 50 is rotated. It is rotated about 46 axes. As a result, the impeller 70 rotates around the axis of the rotating shaft 46, and the cooling water that has flowed into the pump case 14 from the inlet pipe 22 of the pump unit 12 is pumped and flows out of the outlet pipe of the pump unit 12.

  Here, in the rotor 52, the bearing 62 is integrally formed by the rotor core 54, the impeller 70, and the resin mold part 60. In other words, the bearing 62 is integrally formed with the rotor core 54 and the impeller 70 by the resin mold portion 60 that covers the rotor core 54 and the rotor magnet 56. For this reason, unlike the prior art, the bearing 62 can be integrated with the rotor core 54 and the impeller 70 without using other members such as a collar member. Therefore, an increase in the number of parts in the rotor 52 can be suppressed.

  In addition, three flat portions 66 are formed on the outer peripheral side surface 62B1 of the flange portion 62B of the bearing 62, and the flat portion 66 is viewed from the axial direction of the bearing 62 with respect to the radial direction of the flange portion 62B. It is formed along the orthogonal direction. Thereby, since the shape of the outer peripheral side surface 62B1 of the flange portion 62B viewed from the axial direction of the bearing 62 becomes non-circular, the flat portion 66 functions as a rotation stopper of the bearing 62 with respect to the resin mold portion 60. As a result, even if the state in which the resin mold part 60 and the bearing 62 are integrated is released, relative rotation of the bearing 62 with respect to the resin mold part 60 can be prevented by the flat part 66. Therefore, it is possible to maintain the rotation preventing state of the bearing 62 with respect to the resin mold portion 60.

  Moreover, in the bearing 62, the plane part 66 can be formed by notching partly the outer peripheral side surface 62B1 of the flange part 62B. Thereby, relative rotation of the bearing 62 with respect to the resin mold part 60 can be prevented with a simple configuration.

  Further, the bearing 62 is made of a resin material, and a gate serving as a molten resin inlet when the bearing 62 is molded is set in the flat portion 66. For this reason, the gate of the bearing 62 can be set using the flat portion 66 of the bearing 62. That is, in general, in a molded product, by forming a portion where a gate, which is an inflow port for molten resin, is planar, it is advantageous for a mold structure because a mold can be easily configured. Moreover, it becomes easy to perform post-processing of the gate after molding of the molded product. Thereby, by setting the gate G in the flat surface portion 66 of the bearing 62 formed in a flat shape, it is possible to improve the formability of the bearing 62 and maintain the rotation preventing state of the bearing 62 with respect to the resin mold portion 60. it can.

  Further, as described above, the flat surface portion 66 is formed on the outer peripheral side surface 62B1 of the flange portion 62B. For this reason, for example, the distance from the axial center of the bearing 62 to the flat surface portion 66 can be increased as compared with the case where the flat surface portion 66 is temporarily formed on the outer peripheral side surface 62A1 of the bearing body 62A. As a result, even when a relatively large rotational torque is generated in the bearing 62 when the impeller 70 rotates, the rotation preventing state of the bearing 62 with respect to the resin mold portion 60 can be effectively maintained.

  Further, as described above, in the bearing 62, the flat portion 66 is formed by partially cutting the outer peripheral side surface 62B1 of the flange portion 62B. For this reason, it can contribute to suppression of the cost increase with respect to the bearing 62. FIG. That is, in order to make the bearing 62 non-rotating with respect to the resin mold portion 60, for example, a protrusion protruding outward in the radial direction of the flange portion 62B is formed on the outer peripheral side surface 62B1, thereby preventing the rotation of the protrusion. Part. In this case, since the outer shape of the flange portion 62B becomes large, the material used for the bearing 62 increases. On the other hand, in the present embodiment, since the flat portion 66 is formed by partially cutting the outer peripheral side surface 62B1 of the flange portion 62B, it is used for the bearing 62 as compared with the case where the above-mentioned protrusion is provided. Material can be reduced. Thereby, it can contribute to the suppression of the cost increase with respect to the bearing 62.

  Moreover, in the bearing 62, the level | step-difference part 64 is formed in the outer-periphery edge part in the upper surface of the flange part 62B, and the upper mold part 60B is filled in the level | step-difference part 64. FIG. That is, the bottom surface 64A of the stepped portion 64 and the upper mold portion 60B are in contact with each other. For this reason, even when the state where the bearing 62 and the resin mold part 60 are integrated is temporarily released, the relative movement of the bearing 62 to the upper side of the resin mold part 60 can be prevented. Therefore, it is possible to prevent the bearing 62 from coming out upward with respect to the resin mold portion 60.

  In the present embodiment, the plane portion 66 is formed along a direction orthogonal to the radial direction of the flange portion 62B when viewed from the axial direction of the bearing 62. The direction of the plane portion 66 is not limited to this. That is, it is only necessary that the flat portion 66 is formed along the direction intersecting the radial direction of the flange portion 62B when viewed from the axial direction of the bearing 62.

  Moreover, in this Embodiment, the shape of the outer peripheral side surface 62B1 of the flange part 62B seen from the axial direction of the bearing 62 is comprised so that it may become a non-circular shape. Specifically, the outer peripheral side surface 62B1 viewed from the axial direction of the bearing 62 is configured by the arc-shaped side surface and the flat portion 66, but the shape of the outer peripheral side surface 62B1 is not limited thereto. For example, the outer peripheral side surface 62B1 may be composed of three or more plane portions 66, and the outer peripheral side surface 62B1 may be a regular polygon.

  In the present embodiment, the bearing 62 is made of a resin material, but the bearing 62 may be made of a metal material.

DESCRIPTION OF SYMBOLS 10 ... Water pump (liquid pump), 12 ... Pump part, 54 ... Rotor core 56 ... Rotor magnet, 60 ... Resin mold part, 62 ... Bearing, 62A ... Bearing main body (Body part), 62B ... Flange part, 62B1 ... Outer peripheral side surface 66 ... Plane part (rotation prevention part), 70 ... Impeller, G ... Gate, S ... Liquid Rotor structure for pump

Claims (4)

An impeller that pumps the liquid in the pump section by rotating;
A rotor core that is formed in a cylindrical shape, is coaxially arranged with the rotation shaft of the impeller, and in which a rotor magnet is embedded in the axial direction;
A bearing that is coaxially disposed on the radially inner side of the rotor core, is provided integrally with the impeller and the rotor core by a resin mold portion, and has a rotation preventing portion that prevents relative rotation with respect to the resin mold portion;
A rotor structure for a liquid pump comprising:   The anti-rotation portion is a plurality of flat portions formed on the outer peripheral side surface of the bearing, and the flat portion is along a direction intersecting the radial direction of the bearing as viewed from the axial direction of the bearing. The rotor structure for a liquid pump according to claim 1 formed. The bearing is made of a resin material;
The rotor structure for a liquid pump according to claim 2, wherein a gate that is an inlet of a molten resin when the bearing is formed is set in the flat portion. The bearing includes a main body formed in a cylindrical shape, and a flange that protrudes radially outward from the main body,
The rotor structure for a liquid pump according to any one of claims 1 to 3, wherein the rotation preventing portion is formed on an outer peripheral side surface of the flange portion.