JP2008025538A - Water pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent generation of stress at a resin can by preventing interference between a through hole part and a rotating shaft and preventing the cold thermal impact force from being repeatedly applied to the can, and to improve durability. <P>SOLUTION: In the water pump 10, an axial direction the other side of the rotating shaft 58 is supported by a second shaft supporting part 50, the whole of a motor case 14 including the second shaft supporting part 50 is made of metal, and the water pump 10 exhibits strength higher than the one made of resin, and exhibits improved durability. The axial direction the other side of the rotating shaft 58 is inserted into a bottom part 84 of the can 80 made of resin through the through hole part 88, and the through hole part 88 is constituted so that the axial direction the other side of the rotating shaft 58 is inserted while having a space. The water pump 10 is placed under a high temperature environment such as in an engine room, and thereby, the interference between the through hole part 88 and the rotating shaft 58 can be prevented even when the whole of the can 80 is expanded and the through hole part 88 is reduced. As a result, durability of the resin-made can 80 (especially around the through hole part 88) is improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a water pump, and more particularly, to a water pump configured to support a rotating shaft of a rotor to which an impeller is connected with a case.

Conventionally, the following is known as this kind of water pump (for example, refer to patent documents 1). For example, in a water pump described in Patent Document 1, an impeller is integrally provided on a rotor, and a rotating shaft of the rotor is supported by a pair of bearings formed integrally with a case.
JP 2004-1444055 A

  By the way, in this type of water pump, for the purpose of improving the assembling property and simplifying the structure, it is general that the shaft support portion for supporting the rotating shaft of the rotor is made of resin.

  However, the structure in which the shaft support portion that supports the rotating shaft of the rotor is made of resin is established in an environment where there is little stress on the shaft support portion, but for example, a water pump used in a vehicle engine cooling system Furthermore, it is difficult to establish in an environment where the stress on the shaft support is large.

  That is, a resin having a larger linear expansion coefficient than metal expands at a high temperature. Therefore, when metal insert moldings or metal contact parts are arranged around the resin shaft support, when the water pump is placed in a high temperature environment such as in an engine room, the resin The stress that the shaft support receives from a metal insert-molded product, a metal contact part, or the like increases, and durability decreases.

  In addition, when the water pump is placed in an environment where the temperature increases and decreases repeatedly (for example, an environment that repeatedly changes between −40 ° C. and 130 ° C.), the resin shaft support portion is made of a metal that is disposed around the resin pump. The durability is also lowered by receiving repeated thermal shock force generated by a difference in linear expansion coefficient from an insert molded product or a metal contact part, and increasing stress accompanying the thermal shock force.

  Further, when vibration is transmitted from the engine mounted on the vehicle to the water pump or when the water pump is activated, the resin shaft support receives the force accompanying the vibration of the rotor in addition to its own weight. The durability is also lowered by an increase in the force accompanying the vibration.

  This invention is made | formed in view of the said problem, The objective is to provide the water pump which can improve durability compared with the conventional structure.

  The water pump according to claim 1, wherein a rotor connected to a rotating shaft arranged along an axial direction, an impeller connected to the rotor, a stator arranged to face the rotor, and the impeller Is formed, and includes a fluid suction port and a fluid discharge port communicating with the pump chamber, and a first shaft support portion that supports one side in the axial direction of the rotary shaft. The pump case is configured in a cylindrical shape that communicates with the pump chamber inside thereof to form a rotor accommodating chamber in which the rotor is accommodated, and is disposed between the rotor and the stator. It is composed of a can that isolates and seals the stator from the rotor accommodating chamber, and a metal cylindrical body that accommodates the stator inside thereof, and an axial direction of the rotating shaft And the motor case that is configured with a second shaft supporting portion for supporting the other side, characterized by comprising a.

  According to the water pump of the first aspect, the other axial side of the rotating shaft is supported by the second shaft support portion, and the entire motor case including the second shaft support portion is made of metal.

  Accordingly, since the second shaft support portion is configured to have a higher strength than the case where the second shaft support portion is made of resin, the durability of the second shaft support portion, and thus, the water, as compared with the conventional resin configuration, is improved. The durability of the entire pump can be improved.

  The water pump according to claim 2 is the water pump according to claim 1, wherein the can is made of resin and has a bottom portion between the rotor and the second shaft support portion. It has a cylindrical shape and is provided with a through-hole portion through which the other side in the axial direction of the rotating shaft has a gap in the bottom portion.

  According to the water pump of the second aspect, the other side in the axial direction of the rotary shaft is passed through the bottom portion of the can made of resin through the through hole portion, and this through hole portion is the axis of the rotary shaft. The other side in the direction is configured to be penetrated with a gap.

  Therefore, even when the water pump is placed in a high-temperature environment such as in the engine room, or the cooling water in the pump chamber and the rotor accommodating chamber is absorbed, the entire can expands and the through hole is reduced. The interference between the through-hole portion and the rotating shaft can be prevented.

  In addition to this, even if the rotor vibrates when vibration is transmitted from the engine mounted on the vehicle to the water pump or the water pump is operated, the interference between the through hole and the rotating shaft is prevented. Can be prevented.

  Furthermore, even when the water pump is placed in an environment where the temperature is repeatedly increased or decreased (for example, an environment that repeatedly changes between −40 ° C. and 130 ° C.), the linear expansion coefficient between the resin can and the metal rotating shaft It is possible to prevent the can from repeatedly receiving the thermal shock force due to the difference.

  Thus, according to the water pump according to claim 2, since it is possible to prevent the through-hole portion and the rotating shaft from interfering with each other and the can receiving repeated thermal shock force, the resin can (particularly, It is possible to prevent stress from being generated in the peripheral portion of the through-hole portion. Thereby, it becomes possible to improve the durability of the resin can, and consequently the durability of the entire water pump.

  The water pump according to claim 3 is characterized in that, in the water pump according to claim 2, a seal member capable of absorbing vibration is disposed between the through-hole portion and the rotary shaft. .

  According to the water pump of the third aspect, the seal member is disposed between the through hole portion and the rotating shaft, and the seal member is configured to be able to absorb vibration.

  Therefore, when the sealing performance between the through-hole portion and the rotating shaft can be ensured, and vibration is transmitted from the engine mounted on the vehicle to the water pump or the water pump is activated, the rotor vibrates. However, the seal member becomes a vibration damper and can absorb the vibration energy transmitted from the rotating shaft to the can. Thereby, it can prevent that stress generate | occur | produces in resin-made cans.

  The water pump according to claim 4 is the water pump according to claim 2 or 3, wherein the motor case is configured to have a bottom portion on the opposite side of the rotor sandwiching the bottom portion of the can, The second shaft support portion protrudes from the bottom portion of the motor case toward the bottom portion of the can. The bottom portion of the can is formed around the through-hole portion and faces the bottom portion of the motor case. And a protruding wall portion fitted to the second shaft support portion from the outer peripheral side is provided.

  According to the water pump of the fourth aspect, the protruding wall portion protruding from the bottom portion of the can is fitted from the outer peripheral side to the second shaft support portion protruding from the bottom portion of the motor case.

  Accordingly, the sealing performance between the protruding wall portion and the second shaft support portion can be ensured by fitting the protruding wall portion to the second shaft support portion from the outer peripheral side.

[First embodiment]
First, a first embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a side sectional view showing the overall configuration of the water pump 10 according to the first embodiment of the present invention. The water pump 10 according to the first embodiment of the present invention is suitably used, for example, in order to circulate cooling water in an automobile engine cooling device, and includes a pump case 12, a motor case 14, and an impeller member 16. And the stator unit 18 as main components.

  The pump case 12 is made of resin and is formed of a concave body having a concave portion 20 that opens to the motor case 14 side. In the pump case 12, the inside of the recess 20 is a pump chamber 22. Further, the pump case 12 includes, for example, a fluid suction part 24 and a fluid discharge part 26 connected to a pipe provided in an engine cooling device of an automobile.

  The fluid suction part 24 is extended to the opposite side of the motor case 14 along the axial direction, and the fluid discharge part 26 is extended along the tangential direction. The fluid suction part 24 is formed with a fluid suction port 28 communicating with the pump chamber 22 along the axial direction, and the fluid discharge part 26 is provided with a fluid discharge port 30 communicating with the pump chamber 22 in the tangential direction. It is formed along.

  The pump case 12 is provided with a first shaft support portion 32 at the center of the fluid suction port 28 and the pump chamber 22. The first shaft support portion 32 is formed with a recess 34 that opens to the motor case 14 side, and a support plate 36 is disposed in the recess 34 by, for example, insert molding.

  Further, the support plate 36 is provided with a support recess 38 into which one side in the axial direction of a rotation shaft 58 described later is inserted. The first shaft support portion 32 including the support plate 36 is connected and supported by a connection portion 40 that extends radially inward from the inner wall surface of the fluid suction port 28.

  The motor case 14 includes a cylindrical case main body 42 and a lid 44 (bottom) for closing the opening of the case main body 42 opposite to the pump case 12. In the present embodiment, the case main body 42 and the lid body 44 are made of a material having a smaller linear expansion coefficient than the resin, for example, a metal such as aluminum.

  A fastening portion 46 having a screw hole (not shown) is provided on the outer peripheral surface of the case body 42, and a through-hole (not shown) that penetrates the lid 44 in the thickness direction at a position aligned with the fastening portion 46. Is formed. Then, the bolt 48 is inserted into the through hole, and the bolt 48 is screwed into the screw hole of the fastening portion 46, whereby the case main body 42 and the lid body 44 are integrally coupled.

  A second shaft support portion 50 that protrudes toward the bottom portion 84 of the can 80 described later along the axial direction is provided at the central portion in the radial direction of the lid body 44. The second shaft support portion 50 is provided with a support recess 52 into which the other side in the axial direction of the rotation shaft 58 described later is inserted.

  The impeller member 16 has a cylindrical rotor portion 54 on the other side in the axial direction. A hole portion 56 is formed in the central portion in the radial direction of the rotor portion 54 so as to penetrate along the axial direction. The rotation shaft 58 is inserted into the hole portion 56 along the axial direction. Has been.

  One side in the axial direction of the rotary shaft 58 is inserted and supported in the support recess 38 of the first shaft support portion 32 provided in the pump case 12 described above, and the other side in the axial direction of the rotary shaft 58 will be described later. The through hole 88 provided in the stator unit 18 is inserted into and supported by the support recess 52 of the second shaft support 50 provided in the motor case 14 described above.

  A pair of bearing members 60 and 62 is disposed in the hole portion 56 of the rotor portion 54, and the entire impeller member 16 including the rotor portion 54 is attached to the rotating shaft 58 by the bearing members 60 and 62. It is supported rotatably.

  An annular back yoke 64 is provided on the radially outer portion of the rotor portion 54, and a magnet 66 is fixed to the outer peripheral surface of the back yoke 64 along the circumferential direction. An impeller 68 is integrally provided on one side of the rotor portion 54 in the axial direction. The impeller 68 includes a plurality of blades 70 extending radially with respect to the axis, and is rotatably accommodated in the pump chamber 22 described above.

  The stator unit 18 is configured to be integrated with the resin portion 78 by molding an annular stator portion 76 having a coil 72 and a laminated core 74, and the case provided in the motor case 14 described above. Housed inside the main body 42.

  The resin portion 78 of the stator unit 18 is formed with a cylindrical can 80 at the radial center. A radially inner side of the can 80 is a rotor accommodating chamber 82 communicating with the pump chamber 22, and the rotor portion 54 described above is disposed in the rotor accommodating chamber 82 so as to face the stator portion 76 in the radial direction. It is housed in a rotatable manner.

  The can 80 is disposed between the rotor portion 54 and the stator portion 76 to isolate and seal the stator portion 76 from the pump chamber 22 and the rotor accommodating chamber 82. The can 80 includes a bottom portion 84 between the second shaft support portion 50 and the rotor portion 54 provided on the lid body 44, and the bottom portion 84 faces the lid body 44 of the motor case 14. A protruding wall portion 86 is protruded.

  The protruding wall portion 86 and the bottom portion 84 are formed with a through-hole portion 88 penetrating along the axial direction. The through-hole portion 88 includes a first hole portion 90 and a second hole portion 92 that is provided closer to the lid body 44 than the first hole portion 90 and has a larger diameter than the first hole portion 90. Yes.

  The first hole portion 90 is configured such that the other side in the axial direction of the rotary shaft 58 is penetrated with a gap. As will be described in detail later, the entire can 80 is expanded and the through hole portion 88 is reduced. Even when the impeller member 16 vibrates, the dimension is set to prevent interference with the rotating shaft 58.

  Further, the above-described second shaft support portion 50 is inserted into the second hole portion 92, whereby the protruding wall portion 86 is fitted to the second shaft support portion 50 from the outer peripheral side. An O-ring 94 (seal member) made of a material capable of absorbing vibration, such as rubber, is disposed between the second hole portion 92 and the rotary shaft 58 in the through-hole portion 88.

  In the water pump 10, annular fitting portions 96, 97, and 98 are respectively formed on the outer peripheral portions of the pump case 12, the stator unit 18, and the motor case 14. And the pump case 12, the stator unit 18, and the motor case 14 are assembled | attached integrally by each fitting part 96,97,98 being each fitted.

  The pump case 12, the stator unit 18, and the motor case 14 are integrally coupled by a fastener such as a bolt (not shown). Further, an O-ring 99 is interposed between the fitting portion 96 of the pump case 12 and the fitting portion 97 of the stator unit 18.

  In this water pump 10, the entire impeller member 16 including the impeller 68 is rotated by attracting and repelling the magnet 66 of the rotor portion 54 to the magnetic force generated from the stator portion 76, and when the impeller 68 is rotated, the fluid suction port 28 is opened. The fluid is sucked into the pump chamber 22 from outside, and the fluid is discharged from the fluid discharge port 30 to the outside.

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

  According to the water pump 10 according to the first embodiment of the present invention, the other axial side of the rotary shaft 58 is supported by the second shaft support 50, and the entire motor case 14 including the second shaft support 50 is It is made of metal.

  Therefore, since the second shaft support portion 50 is configured to have a higher strength than the case where the second shaft support portion 50 is made of resin, the durability of the second shaft support portion 50 and thus, compared to the conventional resin configuration, The durability of the entire water pump 10 can be improved.

  Further, according to the water pump 10 according to the first embodiment of the present invention, the other side in the axial direction of the rotary shaft 58 is passed through the bottom portion 84 of the resin can 80 through the through-hole portion 88. The through-hole portion 88 is configured such that the other side in the axial direction of the rotary shaft 58 is penetrated with a gap.

  Accordingly, when the water pump 10 is placed in a high temperature environment such as in the engine room or the cooling water in the pump chamber 22 and the rotor housing chamber 82 is absorbed, the entire can 80 is expanded and the through hole 88 is formed. Even in the case of reduction, interference between the through-hole portion 88 and the rotating shaft 58 can be prevented.

  In addition to this, even when the impeller member 16 vibrates due to vibration being transmitted from the engine mounted on the vehicle to the water pump 10 or the water pump 10 being operated, the rotation with the through-hole portion 88 is possible. Interference with the shaft 58 can be prevented.

  Further, even when the water pump 10 is placed in an environment in which the temperature is repeatedly increased and decreased (for example, an environment that repeatedly changes between −40 ° C. and 130 ° C.), the resin can 80 and the metal rotating shaft 58 are It is possible to prevent the can 80 from repeatedly receiving the thermal shock force due to the difference in the linear expansion coefficient.

  Thus, according to the water pump 10 according to the first embodiment of the present invention, it is possible to prevent the through-hole portion 88 and the rotation shaft 58 from interfering with each other, or the can 80 can be repeatedly subjected to the thermal shock force. It is possible to prevent stress from being generated in the resin can 80 (particularly, the periphery of the through-hole portion 88). As a result, the durability of the resin can 80 and, consequently, the durability of the water pump 10 as a whole can be improved.

  Further, according to the water pump 10 according to the first embodiment of the present invention, the O-ring 94 is disposed between the through-hole portion 88 and the rotary shaft 58, and the O-ring 94 is made of, for example, rubber or the like. The material is capable of absorbing vibration.

  Accordingly, the sealability between the through-hole portion 88 and the rotary shaft 58 can be secured, and vibrations are transmitted from the engine mounted on the vehicle to the water pump 10 or the water pump 10 is operated, thereby the impeller. Even when the member 16 vibrates, the O-ring 94 serves as a vibration damper and can absorb vibration energy transmitted from the rotary shaft 58 to the can 80. Thereby, it is possible to prevent stress from being generated in the resin can 80.

  In addition, according to the water pump 10 according to the first embodiment of the present invention, the protruding wall portion 86 protruding from the bottom portion 84 of the can 80 has an outer peripheral side on the second shaft support portion 50 protruding from the lid body 44. It is fitted from.

  Therefore, the sealing performance between the protruding wall portion 86 and the second shaft support portion 50 can be ensured by fitting the protruding wall portion 86 to the second shaft support portion 50 from the outer peripheral side.

  At this time, the sealing structure around the rotating shaft 58 can be made compact by using the rotating shaft 58 as the sealing surface of the O-ring 94.

[Second Embodiment]
Next, a second embodiment of the present invention will be described based on FIG.

  FIG. 2 is a side sectional view showing the overall configuration of the water pump 110 according to the second embodiment of the present invention. In addition, the water pump 110 which concerns on 2nd embodiment of this invention changes the following points with respect to the water pump 10 which concerns on 1st embodiment of the above-mentioned this invention.

  In other words, in the water pump 110 according to the second embodiment of the present invention, the protruding wall portion 112 formed on the bottom portion 84 of the can 80 has its protruding end surface abutted with the protruding end surface of the second shaft support portion 50. It is configured.

  Further, a through-hole portion 114 is formed in the protruding wall portion 112 and the bottom portion 84, and the other side in the axial direction of the rotation shaft 58 is penetrated with a gap. An O-ring 116 (seal member) made of a material capable of absorbing vibration, such as rubber, is disposed therebetween.

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

  According to the water pump 110 according to the second embodiment of the present invention, the other axial side of the rotary shaft 58 is supported by the second shaft support 50, and the entire motor case 14 including the second shaft support 50 is It is made of metal.

  Therefore, since the second shaft support portion 50 is configured to have a higher strength than the case where the second shaft support portion 50 is made of resin, the durability of the second shaft support portion 50 and thus, compared to the conventional resin configuration, The durability of the entire water pump 110 can be improved.

  Further, according to the water pump 110 according to the second embodiment of the present invention, the other side in the axial direction of the rotary shaft 58 passes through the bottom portion 84 of the can 80 made of resin through the through-hole portion 114. The through hole 114 is configured such that the other side in the axial direction of the rotary shaft 58 is penetrated with a gap.

  Therefore, when the water pump 110 is placed in a high temperature environment such as in the engine room, or the cooling water in the pump chamber 22 and the rotor housing chamber 82 is absorbed, the entire can 80 is expanded and the through hole 114 is formed. Even in the case of reduction, interference between the through-hole portion 114 and the rotating shaft 58 can be prevented.

  In addition to this, even when the impeller member 16 vibrates due to vibration being transmitted from the engine mounted on the vehicle to the water pump 110 or the water pump 110 being operated, the through-hole portion 114 rotates. Interference with the shaft 58 can be prevented.

  Further, even when the water pump 110 is placed in an environment in which the temperature is repeatedly increased or decreased (for example, an environment in which the temperature is repeatedly changed between −40 ° C. and 130 ° C.), the resin can 80 and the metal rotating shaft 58 are not connected. It is possible to prevent the can 80 from repeatedly receiving the thermal shock force due to the difference in the linear expansion coefficient.

  Thus, according to the water pump 110 according to the second embodiment of the present invention, it is possible to prevent the through-hole portion 114 and the rotating shaft 58 from interfering with each other, or the can 80 can be repeatedly subjected to the thermal shock force. It is possible to prevent stress from being generated in the resin can 80 (particularly, the periphery of the through-hole portion 114). As a result, it is possible to improve the durability of the resin can 80 and, consequently, the durability of the water pump 110 as a whole.

  Further, according to the water pump 110 according to the second embodiment of the present invention, the O-ring 116 is disposed between the through-hole portion 114 and the rotary shaft 58, and the O-ring 116 is made of rubber or the like, for example. The material is capable of absorbing vibration.

  Therefore, the sealability between the through-hole portion 114 and the rotary shaft 58 can be ensured, and vibrations are transmitted from the engine mounted on the vehicle to the water pump 110 or the water pump 110 is operated, whereby the impeller Even when the member 16 vibrates, the O-ring 116 serves as a vibration damper and can absorb vibration energy transmitted from the rotary shaft 58 to the can 80. Thereby, it is possible to prevent stress from being generated in the resin can 80.

  At this time, the sealing structure around the rotating shaft 58 can be made compact by using the rotating shaft 58 as the sealing surface of the O-ring 116.

[Third embodiment]
Next, a third embodiment of the present invention will be described based on FIG.

  FIG. 3 is a side sectional view showing the overall configuration of the water pump 210 according to the third embodiment of the present invention. In addition, the water pump 210 which concerns on 3rd embodiment of this invention changes the following points with respect to the water pump 10 which concerns on 1st embodiment of the above-mentioned this invention.

  That is, in the water pump 210 according to the third embodiment of the present invention, the protruding wall portion 212 formed on the bottom portion 84 of the can 80 is configured to have a concave shape that opens to the rotor portion 54 side and closes to the lid body 44 side. ing.

  In addition, a support plate 216 that supports the other side in the axial direction of the rotary shaft 58 is disposed in the recess 214 formed in the protruding wall portion 212 by, for example, insert molding, and the support recess formed in the support plate 216. The other side in the axial direction of the rotary shaft 58 is inserted into and supported by 218.

  In addition, a second shaft support portion 220 that protrudes toward the bottom portion 84 of the can 80 along the axial direction is provided at the central portion in the radial direction of the lid body 44, and a support concave portion of the second shaft support portion 220 is provided. The protruding wall portion 212 described above is pressed into and supported by 222.

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

  According to the water pump 210 according to the third embodiment of the present invention, the other axial side of the rotary shaft 58 is supported by the second shaft support portion 220 via the support plate 216 and the recess 214, and this second shaft. The entire motor case 14 including the support part 220 is made of metal.

  Accordingly, since the second shaft support portion 220 is configured to have higher strength than the case where the second shaft support portion 220 is made of a resin, the durability of the second shaft support portion 220 is improved as compared with the conventional resin configuration. The durability of the water pump 210 as a whole can be improved.

  Further, according to the water pump 210 according to the third embodiment of the present invention, the projecting wall portion 212 formed on the bottom portion 84 of the can 80 and supporting the other axial side of the rotating shaft 58 is formed on the lid body 44. The two-shaft support portion 220 is press-fitted into and supported by the support recess 222.

  Therefore, even when vibration is transmitted from the engine mounted on the vehicle to the water pump 210, the swing of the rotating shaft 58 can be suppressed. As a result, the stress acting on the resin portion (for example, the can 80) of the water pump 210 due to the swing of the rotating shaft 58 can be suppressed, so that the durability of the resin portion, and thus the entire water pump 210 can be reduced. Durability can be improved.

  Further, according to the water pump 210 according to the third embodiment of the present invention, the resin-made protruding wall portion 212 is disposed inside the second shaft support portion 220, and the protruding wall portion 212 has the rotating shaft 58. It is configured in a concave shape wrapped from the rotor portion 54 side. Therefore, a sealing member is not required between the protruding wall portion 212 and the second shaft support portion 220, and the cost can be reduced.

It is side surface sectional drawing which shows the whole structure of the water pump which concerns on 1st embodiment of this invention. It is side surface sectional drawing which shows the whole structure of the water pump which concerns on 2nd embodiment of this invention. It is side surface sectional drawing which shows the whole structure of the water pump which concerns on 3rd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,110,210 ... Water pump, 12 ... Pump case, 14 ... Motor case, 16 ... Impeller member, 18 ... Stator unit, 20, 34, 214 ... Recess, 22 ... Pump chamber, 24 ... Fluid suction part, 26 ... Fluid discharge portion, 28 ... Fluid suction port, 30 ... Fluid discharge port, 32 ... First shaft support portion, 36, 216 ... Support plate, 38, 52, 218, 222 ... Support recess, 40 ... Connection portion, 42 ... Case Main body, 44: Lid (bottom), 46: Fastening portion, 48: Bolt, 50, 220: Second shaft support, 54: Rotor (rotor), 56: Hole, 58: Rotating shaft, 60, 62 ... Bearing member, 64 ... Back yoke, 66 ... Magnet, 68 ... Impeller, 70 ... Blade, 72 ... Coil, 74 ... Laminated core, 76 ... Stator part (stator), 78 ... Resin part, 80 Can, 82 ... Rotor housing chamber, 84 ... Bottom, 86, 112, 212 ... Projecting wall, 88, 114 ... Through hole, 90 ... First hole, 92 ... Second hole, 94, 116 ... O-ring (Seal member), 96, 97, 98 ... fitting part, 99 ... O-ring

Claims (4)

A rotor connected to a rotating shaft arranged along the axial direction;
An impeller coupled to the rotor;
A stator disposed opposite the rotor;
A pump chamber in which the impeller is accommodated, a fluid suction port and a fluid discharge port communicating with the pump chamber, and a first shaft support portion that supports one side in the axial direction of the rotating shaft are provided. Pump case,
The pump chamber and the rotor accommodating chamber are arranged between the rotor and the stator, and are formed in a cylindrical shape that forms a rotor accommodating chamber in which the rotor is accommodated in communication with the pump chamber. A can for isolating and sealing the stator from
A motor case that is configured by a metal cylindrical body that accommodates the stator on the inner side thereof and that has a second shaft support portion that supports the other axial side of the rotating shaft;
A water pump comprising:   The can is made of resin and is configured in a bottomed cylindrical shape having a bottom portion between the rotor and the second shaft support portion, and the other side in the axial direction of the rotating shaft is a gap in the bottom portion. The water pump according to claim 1, further comprising a through-hole portion that is passed through.   The water pump according to claim 2, wherein a seal member capable of absorbing vibration is disposed between the through-hole portion and the rotary shaft. The motor case is configured to have a bottom on the opposite side of the rotor across the bottom of the can,
The second shaft support portion protrudes from the bottom of the motor case toward the bottom of the can,
The bottom portion of the can is provided with a protruding wall portion that is formed around the through-hole portion and protrudes toward the bottom portion of the motor case and is fitted to the second shaft support portion from the outer peripheral side. The water pump according to claim 2 or 3, wherein the water pump is provided.

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