JP6432235B2 - Electric pump - Google Patents

Description

  The present invention relates to an electric pump.

  In the electric pump described in the following Patent Document 1, a circuit case member made of resin is fixed to one end portion of a motor case, and a circuit board is fixed to the circuit case member. As a circuit board fixing method, it is described that the circuit board may be fixed to the circuit case member by heat caulking. Thereby, the fixation structure to the circuit case member of a circuit board can be made into a simple structure.

JP 2013-167243 A

  However, when the circuit board is fixed to the resin circuit case member by heat caulking, there are the following concerns. That is, the winding of the motor and the terminal of the connector are joined to the circuit board by soldering, and the winding and the terminal are made of conductive brass or the like. For this reason, the difference of the linear expansion coefficient of a circuit case member and the linear expansion coefficient of a coil | winding and a terminal becomes comparatively large. As a result, the environmental temperature of the electric pump changes between a high temperature and a low temperature, so that stress distortion occurs in the joint portion of the circuit board with the winding and the terminal.

  In view of the above facts, an object of the present invention is to provide an electric pump capable of suppressing stress distortion generated in a joint portion between a winding and a terminal in a circuit board.

The electric pump according to claim 1 is configured to include an impeller accommodated therein, a pump unit that pumps liquid introduced by rotation of the impeller, a rotor, and a stator, and rotates the impeller. The motor unit is formed in a cylindrical shape whose longitudinal direction is the axial direction of the impeller, and is provided on one side of the motor housing in the longitudinal direction of the motor housing, and drives and controls the motor unit. The circuit board to which the terminals constituting the stator and the terminals connected to the external connectors are joined, and the motor housing and the circuit board are provided, and the metal plate material is punched and bent. And a fixing member for fixing the circuit board.

  According to the electric pump having the above configuration, the impeller is accommodated in the pump portion. Moreover, the motor part which rotates an impeller is accommodated in the motor housing, and the motor housing is formed in the cylinder shape which makes the axial direction of an impeller a longitudinal direction. In addition, a circuit board for driving and controlling the motor unit is provided on one side of the motor housing in the longitudinal direction. The circuit board is joined with windings constituting the stator and terminals connected to external connectors. Has been. When the motor unit is driven by the circuit board, the impeller rotates and the liquid that has flowed into the pump unit is pumped.

  Here, a fixing member for fixing the circuit board is provided between the motor housing and the circuit board, and the fixing member is made of metal. Usually, the winding and the terminal are made of conductive brass or the like. For this reason, compared with the case where a fixing member is resin-made temporarily, the difference of the linear expansion coefficient of a fixing member and the linear expansion coefficient of a coil | winding and a terminal can be made small. Thereby, even when the environmental temperature of an electric pump changes between high temperature and low temperature, the stress distortion which arises in the junction part with the coil | winding and terminal in a circuit board can be suppressed.

The electric pump according to claim 2 is the electric pump according to claim 1, wherein the circuit board is covered with a metal circuit cover formed in a bottomed cylindrical shape, and is formed in a bottomed cylindrical shape. covered the previous SL stator by a metal stator cover, with an open end is abutting the stator cover and the open end of the circuit cover, wherein the fixing member is the circuit cover and the stator It is in contact with the cover.

  According to the electric pump having the above configuration, the opening end of the circuit cover and the opening end of the stator cover are in contact with each other, and the fixing member is in contact with the circuit cover or the stator cover. That is, the circuit cover, the stator cover, and the fixing member are electrically connected.

  Thereby, the circuit cover and the stator cover can be made to function as shield members, and the electric field noise caused by the voltage change in the circuit board can be suppressed from radiating to the outside of the water pump.

  That is, for example, by forming a GND pattern at a fixed portion of the circuit board with the fixing member, the circuit cover and the stator cover become the GND potential. For this reason, the circuit board is covered with the circuit cover having the GND potential, and the stator is covered with the stator cover having the GND potential. Thereby, since the electric field noise generated by the voltage change in the circuit board is blocked by the circuit cover and the stator cover, radiation of the electric field noise to the outside of the water pump can be suppressed.

  The electric pump according to claim 3 is the electric pump according to claim 1 or 2, wherein the motor housing has a rotor accommodating portion in which the rotor is accommodated, and the rotor accommodating portion is The fixed member is connected to the inside of the pump unit, and the fixing member has a plate part formed in a plate shape, and the plate part is disposed in proximity to both between the rotor housing part and the circuit board. ing.

  According to the electric pump having the above configuration, the motor housing has the rotor accommodating portion. A rotor is accommodated in the rotor accommodating portion, and the rotor accommodating portion communicates with the inside of the pump portion. That is, the liquid in the pump part is also introduced into the rotor housing part.

  The fixing member has a plate portion formed in a plate shape, and the plate portion is disposed close to both between the rotor housing portion and the circuit board. For this reason, the heat generated by the circuit elements on the circuit board is transmitted to the liquid in the rotor accommodating portion through the metal plate portion. Thereby, the heat dissipation structure using the liquid in the rotor accommodating portion having a higher thermal conductivity than air can be realized.

  The electric pump according to claim 4 is the electric pump according to any one of claims 1 to 3, wherein a base portion made of resin is integrally formed on the fixing member, and the fixing member And the base portion form a fixing member unit, and the fixing member unit closes one side in the longitudinal direction of the motor housing.

  According to the electric pump having the above configuration, since one side in the longitudinal direction of the motor housing is blocked by the fixing member unit, even if a foreign object enters the motor housing, the foreign object enters the circuit board side. Can be suppressed.

  The electric pump according to a fifth aspect is the electric pump according to the fourth aspect, wherein an insertion hole is formed in the base portion, and the winding is inserted into the insertion hole.

  According to the electric pump having the above configuration, since the winding is inserted into the insertion hole of the base portion, the winding can be guided to the circuit board side by the base portion, and the winding can be held by the base portion. Therefore, it is possible to improve the assembling property when the winding is joined to the circuit board.

Electric pump according to claim 6 is the electric pump according to claim 4, burrs generated during punching the previous SL fixing member is embedded in the base portion.

  According to the electric pump having the above configuration, since the burr generated when the fixing member is punched is embedded in the base portion, the burr generated when the fixing member is processed is suppressed by the base portion in the fixing member unit. can do.

  The electric pump according to claim 7 is the electric pump according to claim 4, wherein the fixing member unit is formed in a plate shape in which the longitudinal direction of the motor housing is a plate thickness direction, and the base portion includes A protruding portion that protrudes to one side in the plate thickness direction of the fixing member unit is formed, and the protruding portion constitutes the outermost shape of the fixing member unit.

  According to the electric pump having the above configuration, the protruding portion is formed on the base portion. The protruding portion protrudes to one side in the plate thickness direction of the fixed member unit and constitutes the outermost shape of the fixed member unit. For this reason, for example, in the assembly line of the electric pump, even if the fixing member units are arranged (arranged) in a stacked state in the plate thickness direction, generation of metal powder or the like from the fixing member can be suppressed or prevented. That is, since the projecting portion constitutes the outermost outer shape of the fixing member unit, when the fixing member units are stacked in the plate thickness direction, the projecting portion comes into contact with the adjacent fixing member unit. In other words, the fixing member is prevented from coming into contact with another fixing member unit. As a result, in the assembly line of the electric pump, even if the fixing member units are arranged in a stacked state in the plate thickness direction, the contact between the fixing member and the other fixing member unit is suppressed, so that metal powder or the like from the fixing member Can be suppressed or prevented from occurring.

  The electric pump according to an eighth aspect of the present invention is the electric pump according to any one of the first to third aspects, wherein the fixing member includes a fixing portion that fixes the circuit board. The bottom portion is formed with a bottomed cylindrical portion to which the fastening member for fastening the circuit board is screwed.

According to the electric pump having the above-described configuration, a fastened portion having a bottomed cylindrical shape is formed in the fixing portion of the fixing member, and a fastening member for fastening the circuit board is screwed into the fastened portion. For this reason, for example, foreign matters such as sawdust generated when the fastening member is screwed into the fastened portion can be contained in the fastened portion.
The electric pump according to claim 9, wherein the motor includes an impeller contained therein, a pump unit that pumps liquid introduced by rotation of the impeller, a rotor, and a stator, and rotates the impeller. A motor housing that accommodates the motor unit, and is provided on one side of the motor housing in the longitudinal direction, and controls the drive of the motor unit. A circuit board to which a terminal connected to a winding and an external connector constituting the stator is joined, and is provided between the motor housing and the circuit board, is made of metal, and fixes the circuit board. A fixing member; and the motor housing has a rotor accommodating portion in which the rotor is accommodated, and the rotor accommodating portion is a front portion. The fixed member is connected to the inside of the pump unit, and the fixing member has a plate part formed in a plate shape, and the plate part is disposed in proximity to both between the rotor housing part and the circuit board. ing.
The electric pump according to claim 10, wherein the impeller is housed therein, and includes a pump unit that pumps liquid introduced by rotation of the impeller, a rotor, and a stator, and a motor that rotates the impeller. A motor housing that accommodates the motor unit, and is provided on one side of the motor housing in the longitudinal direction, and controls the drive of the motor unit. A circuit board to which a terminal connected to a winding and an external connector constituting the stator is joined, and is provided between the motor housing and the circuit board, is made of metal, and fixes the circuit board. A fixing member, and a resin base part is integrally formed on the fixing member, and the fixing member and the base part define the fixing member. Fixing member unit is formed, the fixing member unit closes the one longitudinal side of the motor housing.

(A) is the perspective view seen from the upper side which shows the plate unit used for the water pump which concerns on this Embodiment, (B) shows the stationary plate which comprises the plate unit shown to (A). It is the perspective view seen from the upper side. It is a longitudinal cross-sectional view (2-2 sectional view taken on the line of FIG. 3) which shows the whole water pump which concerns on this Embodiment. It is the top view seen from the upper side which shows the state which removed the circuit cover in the water pump shown by FIG. 4 is a longitudinal sectional view (a sectional view taken along line 4-4 in FIG. 3) showing a state in which the stator cover shown in FIG. 2 is in contact with the circuit case and the fixed plate. It is the perspective view which looked at the plate unit shown by FIG. 1 (A) from the downward side. FIG. 7 is a side view of the plate units shown in FIG. 6 in a stacked state. FIG. 5 is a partial enlarged cross-sectional view showing a state where a heat generating component mounted on the circuit board shown in FIG. 4 and a heat radiating plate portion of a fixed plate are in contact with each other via a heat conducting member.

  Hereinafter, the water pump 10 as an “electric pump” according to the present embodiment 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 60 that rotates the impeller 70. Further, the water pump 10 includes a motor housing 30 that houses the motor unit 60, and a circuit device 90 that includes a circuit board 110 for driving and controlling the motor unit 60.

  Hereinafter, each said structure is demonstrated in order of the pump part 12, the motor housing 30, the motor part 60, 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 appropriately shown in the drawings is the lower side (one axial direction of the water pump 10), and the arrow B direction is the upper side. Yes.

(About the pump unit 12)

  As shown in FIG. 2, the pump unit 12 constitutes the lower 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 upward. An impeller accommodating portion 18 that accommodates the impeller 70 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 opens upward. 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 upward, and extends along the circumferential direction of the case body 16.

  In addition, an inlet pipe 22 is integrally formed on the bottom wall of the case 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 downward from the case main body 16. Further, 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 upper 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 is directed upward 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 upper side with respect to the pump portion 12. The motor housing 30 is made of resin and is formed in a substantially bottomed cylindrical shape opened upward 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 open upward. 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 cylindrical portion 34 is formed in a substantially bottomed cylindrical shape that is opened downward, and the open end (lower end) of the inner cylindrical portion 34 is coupled to the bottom wall of the outer cylindrical portion 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 to be described later, and the stator accommodating portion 36 is a substantially annular shape opened upward. It is formed in the space. Furthermore, a space inside the inner cylinder portion 34 is a rotor accommodating portion 38 for accommodating a rotor 62 described later.

  A first coupling portion 40 is integrally formed at the lower 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 lower 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 below, 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 formed integrally with the upper end portion of the outer cylindrical wall 32A. The second coupling portion 42 protrudes 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 (see FIG. 3). Further, the surrounding wall 42 </ b> A is integrally formed on the upper 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 upward from the second coupling portion 42 and is formed over the entire circumference of the second coupling portion 42.

  Further, as shown in FIG. 3, the second coupling portion 42 is integrally formed with a connector portion 44 that is fitted to an external connector (not shown). The connector portion 44 is formed in a substantially bottomed rectangular tube shape opened upward (arrow B direction side in FIG. 2), and protrudes upward from the second coupling portion 42. Further, the motor housing 30 is provided with a connector terminal 46 as a “terminal” connected to an external connector, and the connector terminal 46 is made of brass. One end portion of the connector terminal 46 is disposed inside the connector portion 44. The connector terminal 46 is bent into a predetermined shape, and the other end of the connector terminal 46 extends upward from the motor housing 30 and is connected to a circuit board 110 described later.

  As shown in FIG. 2, a substantially cylindrical support portion 48 is integrally formed on the bottom wall of the inner cylinder portion 34 (rotor accommodating portion 38) at the center portion. The support portion 48 is disposed coaxially with the inlet pipe 22 of the pump portion 12 and protrudes downward from the bottom wall of the inner cylinder portion 34. Furthermore, a cylindrical rotary shaft 50 is provided in the inner cylinder portion 34, and the rotary shaft 50 is disposed coaxially with the support portion 48. The upper end portion of the rotation shaft 50 is fixedly supported by the support portion 48, and the rotation shaft 50 protrudes downward from the support portion 48.

  Furthermore, a plurality of recesses 52 opened downward are formed in the bottom wall of the inner cylinder portion 34, and the recesses 52 are arranged in the circumferential direction of the support portion 48 at positions radially outside the support portion 48. Are arranged along. As a result, the cooling water in the pump unit 12 also flows into the recess 52. Note that when the water pump 10 is used in a state where the water pump 10 is disposed upside down, cast iron, impurities, and the like generated in the piping and the like can be stored in the recess 52. Thereby, it is comprised so that it may suppress that the bearing 64 mentioned later is worn out by generation | occurrence | production of such an impurity.

(About the motor unit 60)

  As shown in FIG. 2, the motor unit 60 includes a rotor 62 and a stator 80. The rotor 62 is accommodated in the rotor accommodating portion 38 of the motor housing 30. Further, the rotor 62 is formed in a substantially cylindrical shape, and is disposed on the outer side in the radial direction of the rotation shaft 50 and coaxially with the rotation shaft 50. A plurality of magnets (not shown) are provided inside the rotor 62, and the magnets are arranged along the circumferential direction of the rotor 62. A bearing 64 is provided on the radially inner side of the rotor 62 so as to be separated from the rotor 62. The bearing 64 is formed in a substantially cylindrical shape and is rotatably supported on the rotary shaft 50. And the bearing 64 and the rotor 62 are integrally shape | molded by the mold part 66 comprised with the resin material. Thereby, the rotor 62 is rotatably supported by the rotating shaft 50 via the bearing 64.

  Further, a first disk portion 72 and a blade 74 constituting the impeller 70 are integrally formed at the lower end portion of the mold portion 66. The first disk portion 72 is formed in a substantially disk shape, and is arranged coaxially with the rotation shaft 50 with the plate thickness direction being the axial direction of the rotation shaft 50. The blade 74 projects upward from the first disk portion 72. Further, a second disk portion 76 constituting the impeller 70 is provided below the blade 74. 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.

  The stator 80 includes a stator core 82 formed in an annular shape and a brass winding 84 having conductivity, and is accommodated in the stator accommodating portion 36 of the motor housing 30. 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 plate thickness direction being the vertical 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. As shown in FIG. 4, the end portion of the winding 84 extends upward from the motor housing 30 (stator accommodating portion 36), and is joined to a circuit board 110, which will be described later, by soldering. An insulating member 85 (see FIG. 2) is interposed between the winding portion 84A and the tooth portion 82A.

  The stator 80 is covered with a stator cover 86. The stator cover 86 is made of a steel plate and is formed in a substantially bottomed cylindrical shape opened upward. Further, a circular arrangement hole 86A (see FIG. 2) is formed through the bottom wall of the stator cover 86 in the vertical direction. The stator 80 is fitted into the stator cover 86, and the stator 80 and the stator cover 86 are accommodated in the stator accommodating portion 36. In this state, the inner cylindrical portion 34 of the motor housing 30 is disposed inside the arrangement hole 86A.

  A stator cover flange portion 86 </ b> B is integrally formed at the open end (upper end) of the stator cover 86. The stator cover flange portion 86B extends from the open end of the stator cover 86 to the outside in the radial direction of the stator cover 86, and is disposed above the second coupling portion 42 of the motor housing 30 and inside the surrounding wall 42A. Yes. And the stator cover flange part 86B is being fixed to the 2nd coupling part 42 of the motor housing 30 with the circuit cover flange part 112A mentioned later.

(About the circuit device 90)

  As shown in FIG. 2, the circuit device 90 constitutes an upper portion of the water pump 10. The circuit device 90 includes a plate unit 92 as a “fixing member unit”, a circuit board 110, and a circuit cover 112.

  The plate unit 92 is disposed on the upper side (one side in the longitudinal direction) of the motor housing 30 and is formed in a substantially circular plate shape as a whole. As shown in FIGS. 1A and 5, the plate unit 92 includes a fixing plate 94 as a “fixing member” and a base portion 104 made of resin.

  As shown in FIG. 1B, the fixed plate 94 is made of a metal plate material (in the present embodiment, a steel plate) and is formed by punching and bending the plate material. Yes. The fixed plate 94 includes a ring plate portion 96 having a substantially annular plate shape, and the ring plate portion 96 constitutes a lower portion of the plate unit 92. The ring plate portion 96 is arranged with the plate thickness direction in the vertical direction, and the lower surface of the ring plate portion 96 is in contact with the upper surface of the stator cover flange portion 86B (see FIGS. 2 and 4). In addition, a plurality (four in this embodiment) of fixing holes 96A (see FIG. 5) are formed through the ring plate portion 96. A screw 120 (see FIG. 3) is inserted into the fixing hole 96A, and the fixing plate 94 (plate unit 92) is fastened and fixed to the stator cover flange portion 86B. Accordingly, the fixed plate 94 (plate unit 92) is fixed to the motor housing 30 via the stator cover 86.

  The ring plate portion 96 is integrally formed with a plurality of (three in this embodiment) fixing pieces 98 for fixing a circuit board 110 to be described later. The fixed piece 98 extends upward (bent upward) from the outer periphery of the ring plate portion 96, and the distal end portion of the fixed piece 98 is bent radially inward of the ring plate portion 96. And the front-end | tip part of the fixed piece 98 is made into the fixed part 98A, and the fixed part 98A is arrange | positioned facing the ring plate part 96 in the up-down direction. The fixing portion 98A is formed with a burring 98B as a “fastened portion” for fastening and fixing a circuit board 110 to be described later. The burring 98B protrudes downward from the fixing portion 98A, It is formed in a substantially bottomed cylindrical shape that opens upward.

  Further, the ring plate portion 96 is integrally formed with a heat radiating plate portion 100 as a substantially disk-shaped “plate portion” via a connecting portion 102. The heat dissipating plate portion 100 is disposed on the inner side in the radial direction of the ring plate portion 96 with the plate thickness direction being the vertical direction, and is disposed above the ring plate portion 96 and below the fixing portion 98A. Yes. And the connection part 102 is extended from the inner peripheral part of the ring plate part 96 to the outer peripheral part of the thermal radiation plate part 100, and has connected both.

  Further, when the fixing plate 94 is punched, the fixing plate 94 is punched upward (in the direction of arrow B in FIG. 1B) in a state where the fixing plate 94 is unfolded. That is, the burr surface of the fixed plate 94 (the surface on which the burr generated on the fractured surface is formed by punching) is set as the upper surface of the fixed plate 94 in the unfolded state. Thus, in the state where the fixing plate 94 is formed as shown in FIG. 1B, the upper surfaces of the ring plate portion 96 and the heat radiating plate portion 100, the lower surface of the fixing portion 98A, and the inner surface of the fixing piece 98 are respectively burr surfaces. It is said that. That is, the burr surface (upper surface) of the ring plate portion 96 and the burr surface (lower surface) of the fixing portion 98A are configured to face each other in the vertical direction by bending the fixing piece 98 as described above. .

  As shown in FIGS. 1A and 5, the base portion 104 is formed in a substantially cylindrical shape. Further, the base portion 104 is disposed on the radially outer side of the heat radiating plate portion 100 and is disposed between the ring plate portion 96 and the fixed portion 98A in the vertical direction. Then, the base portion 104 and the fixed plate 94 are integrally formed by outsert molding or the like so that the base portion 104 fills a gap between each of the ring plate portion 96, the fixed piece 98, and the heat radiating plate portion 100. ing. Further, in a state where the base portion 104 and the fixing plate 94 are integrally formed, the upper and lower surfaces of the heat radiating plate portion 100 are exposed, and the upper surface of the fixing portion 98A and the lower surface of the ring plate portion 96 are exposed.

  Further, in a state where the base portion 104 and the fixing plate 94 are integrally formed, the base portion 104 covers the edge portions of the burr surfaces of the ring plate portion 96, the fixing portion 98A, the heat radiating plate portion 100, and the fixing piece 98. Is configured to do. Thereby, the burr | flash which generate | occur | produced in the ring plate part 96, the fixing part 98A, the heat radiating plate part 100, and the fixing piece 98 is embed | buried under the base part 104. FIG. Note that, at the outer peripheral side edge portion of the burr surface in the ring plate portion 96, only a part of the outer peripheral side edge portion is covered with the base portion 104.

  Further, the base portion 104 is formed with a notch 104A at a position corresponding to the fixing hole 96A of the fixing plate 94, and the notch 104A is opened to the outside in the radial direction of the base portion 104 when viewed in the vertical direction. It is formed in a substantially U shape. Thereby, in the plate unit 92, the fixing hole 96A is exposed.

  Furthermore, a plurality of (six in this embodiment) insertion holes 104B are formed through the base portion 104 in the vertical direction. Then, the aforementioned winding 84 is inserted into the insertion hole 104B from the lower side, and the terminal portion of the winding 84 is extended upward from the base portion 104 (see FIG. 4). The insertion hole 104B is formed in a circular shape, and the diameter of the insertion hole 104B is set slightly larger than the wire diameter of the winding 84 described above.

  Further, as shown in FIG. 5, a plurality (three in this embodiment) of protruding portions 106 are formed on the lower surface of the base portion 104 (the end surface on one side in the plate thickness direction of the base portion 104). The protruding portion 106 is formed in a substantially cylindrical shape and protrudes downward (one side in the plate thickness direction of the base portion 104). Specifically, the protruding height of the protruding portion 106 is set so that the tip surface of the protruding portion 106 protrudes downward from the ring plate portion 96. Thereby, the protruding portion 106 constitutes the outermost shape of the plate unit 92. Further, the protruding portion 106 is disposed at a position corresponding to the fixed portion 98A. In other words, in the plate unit 92, the fixed portion 98 </ b> A and the protruding portion 106 are arranged so as to wrap in the plate thickness direction of the plate unit 92.

  As shown in FIG. 3, the circuit board 110 is formed in a substantially disc shape. The circuit board 110 is disposed above the plate unit 92 with the plate thickness direction being the vertical direction, and the lower surface of the circuit board 110 is in contact with the upper surface of the fixing portion 98A of the fixing plate 94 (see FIG. 2 and FIG. 4). The circuit board 110 is formed with a mounting hole (not shown) at a position corresponding to the burring 98B of the fixing plate 94 described above, and a tapping screw 122 as a “fastening member” is inserted into the mounting hole and the burring 98B. Then, the circuit board 110 is fixed to the plate unit 92 (fixed plate 94) by the tapping screw 122 (see FIG. 4). In addition, a GND pattern (not shown) is formed on the lower surface of the circuit board 110 at the contact portion with the upper surface of the fixing portion 98A.

  In addition, the terminal portion of the winding 84 extending upward from the base portion 104 is joined to the circuit board 110 by soldering, and the other end portion of the connector terminal 46 is joined by soldering. Furthermore, a plurality of circuit elements 110 </ b> A are mounted on the upper and lower surfaces of the circuit board 110. Further, the above-described heat radiating plate portion 100 of the fixed plate 94 is disposed between the circuit board 110 and the bottom wall of the rotor housing portion 38 of the motor housing 30 in close proximity to each other (see FIGS. 2 and 4). ).

  As shown in FIG. 2, the circuit cover 112 is made of a steel plate. The circuit cover 112 is formed in a substantially bottomed cylindrical shape that opens downward, and is disposed coaxially with the rotary shaft 50. A circuit cover flange portion 112A is integrally formed at the opening end of the circuit cover 112, and the circuit cover flange portion 112A protrudes from the opening end of the circuit cover 112 to the outside in the radial direction of the circuit cover 112. The circuit cover 112 is formed over the entire circumference. The circuit cover 112 covers the circuit board 110 and the plate unit 92 and closes the upper end portion of the motor housing 30. Specifically, as shown in FIG. 4, the circuit cover flange portion 112 </ b> A is disposed inside the surrounding wall 42 </ b> A of the motor housing 30 and opposed to the stator cover flange portion 86 </ b> B of the stator cover 86 in the vertical direction. Yes. Furthermore, a plurality of insertion holes 112Aa are formed in the circuit cover flange portion 112A. Further, a plurality of burrings 86Ba corresponding to the insertion holes 112Aa are formed in the stator cover flange portion 86B described above. The burring 86Ba is arranged coaxially with the insertion hole 112Aa and is formed in a cylindrical shape protruding downward. Then, the tapping screw 124 is inserted into the insertion hole 112Aa, the screw portion of the tapping screw 124 is screwed to the inner peripheral surface of the burring 86Ba, and the circuit cover flange portion 112A is fastened to the stator cover flange portion 86B. The motor housing 30 is fixed.

  As shown in FIG. 2, in a state where the circuit cover 112 is fixed to the motor housing 30, the circuit board 110 and the motor unit 60 are separated by a plate unit 92. That is, the upper end side (one side in the longitudinal direction) of the motor housing 30 is closed by the plate unit 92 so as to separate the circuit board 110 and the motor unit 60.

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

  In the water pump 10 configured as described above, the winding 84 and the connector terminal 46 are joined to the circuit board 110 by soldering, and the circuit board 110 is fixed to the fixing plate 94 of the plate unit 92.

  Then, when an external connector is connected to the connector unit 44 and electric power for driving and controlling the motor unit 60 is supplied from the external connector to the circuit board 110, the motor unit 60 is driven and the rotor 62 and the impeller of the motor unit 60 are driven. 70 is rotated about the axis of the rotary shaft 50. When the impeller 70 is rotated about the axis of the rotary shaft 50, the cooling water that has flowed into the pump case 14 from the inlet pipe 22 of the pump unit 12 is pumped and discharged from the outlet pipe.

  Here, the fixing plate 94 is made of a steel plate (metal), and the winding 84 and the connector terminal 46 are made of conductive brass. For this reason, the difference between the linear expansion coefficient of the fixed plate 94 and the linear expansion coefficients of the winding 84 and the connector terminal 46 can be reduced as compared with the case where the fixed plate 94 is made of resin. That is, the difference in coefficient of linear expansion between the member that fixes the circuit board 110 and the member that is bonded to the circuit board 110 can be reduced. Thereby, even when the environmental temperature of the water pump 10 changes between a high temperature and a low temperature, it is possible to suppress the stress distortion generated in the joint portion between the winding 84 and the connector terminal 46 in the circuit board 110.

  The circuit board 110 is covered with a circuit cover 112 made of a steel plate, and the stator 80 is covered with a stator cover 86 made of a steel plate. Further, the circuit cover flange portion 112 </ b> A of the circuit cover 112 and the stator cover flange portion 86 </ b> B of the stator cover 86 are in contact with each other, and the fixing plate 94 is in contact with the stator cover flange portion 86 </ b> B of the stator cover 86. Thereby, the fixing plate 94, the stator cover 86, and the circuit cover 112 are electrically connected. Furthermore, a GND pattern is formed on the lower surface of the circuit board 110 at a contact portion with the fixing plate 94 (fixing portion 98A). Therefore, the circuit board 110 is covered with the circuit cover 112 set to the GND potential, and the stator 80 is covered with the stator cover 86 set to the GND potential. As a result, the circuit cover 112 and the stator cover 86 function as shield members against electric field noise caused by voltage changes in the circuit board 110. As a result, the electric field noise can be suppressed from radiating to the outside of the circuit cover 112 and the stator cover 86.

  Further, the screw portion of the tapping screw 124 is screwed onto the inner peripheral surface of the burring 86Ba of the stator cover flange portion 86B, and the circuit cover 112 and the stator cover 86 are fastened by the tapping screw 124. Thereby, it is possible to further suppress the electric field noise caused by the voltage change in the circuit board 110 from radiating to the outside of the circuit cover 112 and the stator cover 86 while avoiding electrolytic corrosion at the fastening portion between the circuit cover 112 and the stator cover 86. . That is, when the circuit cover flange portion 112 </ b> A is fixed with a screw and a nut instead of the tapping screw 124, for example, a brass nut may be inserted into the second coupling portion 42 of the motor housing 30. In this case, there is a possibility that electrolytic corrosion occurs at the fastening portion due to fastening of different materials. Further, the screw is screwed to the nut and is not screwed to the stator cover 86. On the other hand, since the circuit cover flange portion 112A is fastened and fixed to the stator cover flange portion 86B by the tapping screw 124, electrolytic corrosion at the fastening portion between the circuit cover 112 and the stator cover 86 can be avoided. Further, since the thread portion of the tapping screw 124 is screwed into the inner peripheral surface of the burring 86Ba of the stator cover flange portion 86B, the electrical connection between the stator cover 86 and the circuit cover 112 can be improved. As described above, the electric field noise caused by the voltage change in the circuit board 110 can be further suppressed from radiating to the outside of the circuit cover 112 and the stator cover 86.

  Further, the fixed plate 94 has a heat radiating plate portion 100 formed in a plate shape, and the heat radiating plate portion 100 is disposed between the bottom wall of the rotor housing portion 38 of the motor housing 30 and the circuit board 110. It is arranged close to. For this reason, the heat generated by the circuit element 110 </ b> A on the circuit board 110 is transmitted to the cooling water in the rotor accommodating portion 38 via the steel plate heat radiating plate portion 100. As a result, it is possible to realize a heat dissipation structure using the cooling water in the rotor accommodating portion 38 having a higher thermal conductivity than air.

  Further, in the fixed plate 94, the heat radiating plate portion 100 is disposed inside the ring plate portion 96 in the radial direction, and the ring plate portion 96 and the heat radiating plate portion 100 are connected by the connecting portion 102. Thereby, the fixed plate 94 can be configured in a shape with good plate removal efficiency.

  Furthermore, a base portion 104 is formed integrally with the fixed plate 94, and the upper end side of the motor housing 30 is closed by a plate unit 92 (the fixed plate 94 and the base portion 104). As a result, even if a foreign object or the like enters the motor housing 30, the foreign object can be prevented from entering the circuit board 110 side. For example, it is possible to prevent burrs that may be generated when the stator 80 is fitted into the stator cover 86 from entering the circuit board 110 side.

  Further, an insertion hole 104B is formed in the base portion 104, and a terminal portion of the winding 84 is inserted into the insertion hole 104B. For this reason, when arranging the terminal portion of the winding 84 to the circuit board 110 side, the terminal portion of the winding 84 can be guided to the circuit board 110 side by the base portion 104, and the terminal portion of the winding 84 is used as a base. It can be held by the unit 104. Therefore, it is possible to improve the assembling property when joining the terminal portion of the winding 84 to the circuit board 110.

  Furthermore, the fixed plate 94 is formed by punching a steel plate. When the base portion 104 and the fixed plate 94 are integrally formed (that is, the plate unit 92), burrs (ring plate generated in the ring plate portion 96, the fixed portion 98A, the heat radiating plate portion 100, and the fixed piece 98 are formed. The part 96 (except for some burrs) is embedded in the base part 104. For this reason, in the plate unit 92, it is possible to suppress the burr generated when the fixed plate 94 is processed by the base portion 104.

  Further, the base portion 104 is formed with a protruding portion 106 that protrudes to one side (downward side) in the plate thickness direction of the plate unit 92, and the protruding portion 106 constitutes the outermost shape of the plate unit 92. . Specifically, the protruding height of the protruding portion 106 is set so that the front end surface of the protruding portion 106 protrudes downward from the ring plate portion 96, and the protruding portion 106 corresponds to the fixing portion 98A. Placed in position. For this reason, as shown in FIG. 6, in the stacked state of the plate units 92, the front end surface (lower surface) of the protruding portion 106 is in contact with the fixing portion 98 </ b> A (the upper surface thereof). Since the gap G is formed between the plate unit 92 (fixed plate 94) and the plate unit 92 (fixed plate 94), the fixed plate 94 is prevented from coming into contact with another plate unit 92 (fixed plate 94). Thereby, productivity when the water pump 10 is assembled can be improved.

  That is, if the protruding portion 106 is omitted from the base portion 104, the fixed plates 94 adjacent to each other in the plate thickness direction of the plate units 92 come into contact with each other in a state where the plate units 92 are stacked. For this reason, for example, when the fixed plates 94 are rubbed with each other, foreign substances such as metal powder may be generated from the fixed plate 94. Thereby, for example, when the plate units 92 are stacked and arranged (arranged) in the assembly line of the water pump 10, it is necessary to use a jig, a cover, or the like for making the fixed plates 94 non-contact with each other.

  On the other hand, in the present embodiment, as described above, the projecting portion 106 forms the outermost shape of the plate unit 92, so that it is fixed even if the plate units 92 are arranged (arranged) in a stacked state. It can prevent that plates 94 contact. Thereby, even if the plate units 92 are arranged (arranged) in a stacked state in the assembly line of the water pump 10 or the like, generation of foreign matters such as metal powder on the fixed plate 94 can be suppressed. Therefore, since it is not necessary to use the jig, the cover, or the like in the assembly line of the water pump 10 or the like, the productivity in the water pump 10 can be improved.

  Further, a burring 98B is formed in the fixing portion 98A of the fixing plate 94, and the burring 98B is formed in a substantially bottomed cylindrical shape protruding downward from the fixing portion 98A and opened upward. ing. Therefore, foreign matter such as sawdust generated when the circuit board 110 is fixed to the plate unit 92 (fixed plate 94) by the tapping screw 122 can be enclosed in the burring 98B. Thereby, since foreign substances, such as the said sawdust, are prevented from adhering to the circuit board 110, the reliability in the water pump 10 can be improved.

  In the present embodiment, the fixing plate 94, the stator cover 86, and the circuit cover 112 are made of steel plates, but these may be made of another metal material. For example, the fixing plate 94, the stator cover 86, and the circuit cover 112 may be made of an aluminum alloy plate material.

  In the present embodiment, the stationary plate 94, the stator cover 86, and the circuit cover 112 prevent the electric field noise generated by the voltage change in the circuit board 110 from radiating to the outside. In addition to this, the second disk portion 76 of the impeller 70 may be made of metal (for example, aluminum alloy), or made of metal (for example, aluminum alloy) that covers the bottom wall of the rotor accommodating portion 38, for example. The cover plate 130 (see FIG. 4) may be added separately. Thereby, the radiation of the electric field noise to the outside of the water pump 10 can be further suppressed.

  Further, in the present embodiment, the heat radiating plate portion 100 of the fixed plate 94 is disposed in proximity to the bottom wall of the rotor accommodating portion 38 and the circuit board 110. However, the heat radiating plate portion 100 and the bottom wall of the rotor accommodating portion 38 are arranged. A heat conductive sheet, a heat conductive material, or the like may be interposed between the heat sink plate 100 and the heat radiating plate portion 100 and the circuit board 110. For example, as shown in FIG. 7, a clay-like heat conduction member 128 may be interposed between a circuit element 110 </ b> A such as an FET mounted on the circuit board 110 and the heat radiating plate portion 100. Further, a heat conductive member 128 may be interposed between the rotor accommodating portion 38 or the cover plate 130 described above and the heat radiating plate portion 100 (in FIG. 7, between the cover plate 130 and the heat conductive member 128). A heat conducting member 128 is interposed).

  In the present embodiment, the fixed plate 94 is in contact with the stator cover flange portion 86B of the stator cover 86, but the fixed plate 94 may be configured to contact the circuit cover 112.

  Furthermore, in the present embodiment, in the ring plate portion 96 of the plate unit 92, only a part of the outer peripheral side edge portion of the burr surface of the ring plate portion 96 is covered by the base portion 104. The entire outer peripheral side edge portion on the burr surface may be covered with the base portion 104.

DESCRIPTION OF SYMBOLS 10 ... Water pump (electric pump), 12 ... Pump part, 30 ... Motor housing, 38 ... Rotor accommodating part, 46 ... Connector terminal (terminal), 60 ... Motor part, 62 ... rotor, 70 ... impeller, 80 ... stator, 84 ... winding, 86 ... stator cover, 86B ... stator cover flange, 92 ... plate unit (fixing member) Unit), 94 ... fixing plate (fixing member), 98A ... fixing portion, 98B ... burring (fastened portion), 100 ... radiating plate portion (plate portion), 104 ... base portion , 104B ... insertion hole, 106 ... projection, 110 ... circuit board, 112 ... circuit cover, 122 ... tapping screw (fastening member)

Claims (10)

An impeller is housed inside, and a pump unit that pumps inflowed liquid by rotating the impeller;
A motor unit configured to include a rotor and a stator and rotate the impeller;
A motor housing that is formed in a cylindrical shape with the axial direction of the impeller as a longitudinal direction and that houses the motor unit;
A circuit board that is provided on one side in the longitudinal direction of the motor housing, drives and controls the motor unit, and is joined to a terminal that is connected to a winding and an external connector constituting the stator;
A fixing member provided between the motor housing and the circuit board, formed by punching and bending a metal plate, and fixing the circuit board;
Electric pump equipped with. Together with the circuit board is covered by a metal circuit cover formed into a bottomed cylindrical shape, it is covered previous SL stator by a metal stator cover formed into a bottomed cylindrical shape,
The electric pump according to claim 1, wherein the opening end of the circuit cover and the opening end of the stator cover are in contact with each other, and the fixing member is in contact with the circuit cover or the stator cover. The motor housing has a rotor accommodating portion in which the rotor is accommodated, and the rotor accommodating portion communicates with the inside of the pump portion,
The said fixing member has the plate part formed in plate shape, and the plate part is arrange | positioned in the proximity of both between the said rotor accommodating part and the said circuit board. The electric pump as described in. A resin base portion is integrally formed with the fixing member, and a fixing member unit is formed by the fixing member and the base portion.
The electric pump according to any one of claims 1 to 3, wherein the fixing member unit closes one side in a longitudinal direction of the motor housing.   The electric pump according to claim 4, wherein an insertion hole is formed in the base portion, and the winding is inserted into the insertion hole. Electric pump according to claim 4, burrs generated during punching the previous SL fixing member is embedded in the base portion. The fixing member unit is formed in a plate shape having a longitudinal direction of the motor housing as a plate thickness direction,
The protrusion which protruded to the plate | board thickness direction one side of the said fixing member unit is formed in the said base part, The said protrusion comprises the outermost shape of the said fixing member unit. Electric pump.   The fixing member has a fixing part for fixing the circuit board, and a bottomed cylindrical fastening part to which a fastening member for fastening the circuit board is screwed is formed in the fixing part. The electric pump according to any one of claims 1 to 3. An impeller is housed inside, and a pump unit that pumps inflowed liquid by rotating the impeller;
A motor unit configured to include a rotor and a stator and rotate the impeller;
A motor housing that is formed in a cylindrical shape with the axial direction of the impeller as a longitudinal direction and that houses the motor unit;
A circuit board that is provided on one side in the longitudinal direction of the motor housing, drives and controls the motor unit, and is joined to a terminal that is connected to a winding and an external connector constituting the stator;
A fixing member that is provided between the motor housing and the circuit board, is made of metal, and fixes the circuit board;
With
The motor housing has a rotor accommodating portion in which the rotor is accommodated, and the rotor accommodating portion communicates with the inside of the pump portion,
The fixing member has a plate portion formed in a plate shape, and the plate portion is disposed between the rotor accommodating portion and the circuit board in proximity to each other. An impeller is housed inside, and a pump unit that pumps inflowed liquid by rotating the impeller;
A motor unit configured to include a rotor and a stator and rotate the impeller;
A motor housing that is formed in a cylindrical shape with the axial direction of the impeller as a longitudinal direction and that houses the motor unit;
A circuit board that is provided on one side in the longitudinal direction of the motor housing, drives and controls the motor unit, and is joined to a terminal that is connected to a winding and an external connector constituting the stator;
A fixing member that is provided between the motor housing and the circuit board, is made of metal, and fixes the circuit board;
With
A resin base portion is integrally formed with the fixing member, and a fixing member unit is formed by the fixing member and the base portion.
An electric pump in which the fixing member unit closes one side in the longitudinal direction of the motor housing.

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