`
`CERTIFICATION OF TRANSLATION
`
`
`I, Christopher L. Field, residing at 43 Sherman’s Bridge Rd., Wayland MA, 01778,
`United States of America, declare and state as follows:
`
` I
`
` am well acquainted with the English and Japanese languages. I have in the past
`translated numerous Japanese documents of legal and/or technical content into
`English. I am fully accredited by the American Translators Association for
`Japanese to English translation.
`
`To a copy of this Japanese document I attach an English translation and my
`Certification of Translation. I hereby certify that the English translation of the
`document entitled "JP H11-166500, Pump” is, to the best of my knowledge and
`ability, an accurate translation.
`
` I
`
` further declare that all statements made herein of my own knowledge are true,
`that all statements made on information and belief are believed to be true, and that
`false statements and the like are punishable by fine and imprisonment, or both,
`under Section 1001 of Title 18 of the United States Code.
`
`Signed,
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`June 8, 2017
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`_______________
`Date
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`________________________
`Christopher Field
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`Petitioners' Exhibit 1004, pg. 1
`
`

`

`
`19 THE PATENT OFFICE OF JAPAN (JP)
`12 OFFICIAL GAZETTE FOR UNEXAMINED PATENTS (A)
`
`
`11 H11-166500 Published Unexamined Application: H11-166500
`43 Date of Publication: June 22, 1999
`____________________________________________________________________________________________
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`51 Int. Cl6
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`F 04 D 29/58
`H 02 K 1/18
` 1/27
` 5/173
` 9/00
`H 02 K 21/14
`//H 02 K 7/14
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`Identification FI
`Symbols
`F 04 D 29/58
`H 02 K 1/18
` 1/27
` 5/173
` 9/00
`H 02 K 21/14
` 7/14B
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` 501
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` D
` E
`501D
` A
` Z
` M
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` Request for Examination: Not yet requested
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`21 Application Number
`H09-333009
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`22 Filing Date
`December 3, 1997
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`
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`Number of Claims 25 Application Form: OL
`(total 12 pages)
`
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`71 Applicant 000221029
`Toshiba ABA Corp.
`3-9 3-chome, Shinbashi, Minato-ku, Tokyo-to
`71 Applicant 000003078
`Toshiba Corp.
`72 Horikawa-cho, Saiwai-ku, Kawasaki, Kanagawa Pref.
`72 Inventor: UMEDA Mikio
`33-10 Nishi ni-chome, Nishi-ku, Nagoya-shi
`Toshiba AVE Corp.
`72 Inventor: NAGATA Masahito
`991 Anada-cho, Seto-shi, Aichi-ken
`Toshiba Corp, Aichi Plant
`74 Agent: Benrishi SATO Tsuyoshi
`
`
`54 [Title of Invention]
`
`Pump
`
`
`57 [Abstract]
` [Subject] To enhance, in a pump, the cooling properties of high heat emission components, especially power ICs
`and the like in control circuits, and of the stator.
` [Means of Resolution] The permanent magnet rotor 6 of the motor 1 is resin molded to constitute a molded rotor B;
`at least a part of the control circuit E and at least the coil 4 of the stator 2 are resin molded to constitute a molded
`stator A; and at least a portion of the fluid channel is constituted by the molded stator A. Fluid drawn in from the
`intake port 14 flows in contact with the molded stator A and the molded rotor B, thereby liquid-cooling same.
`
`-1-
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`
`
`Petitioners' Exhibit 1004, pg. 2
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`

`

`
`
`
`
`4-coil
` 6-rotor
` 8-permanent
`magnet
`19-impeller
` A: molded stator
` B: molded rotor
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`-2-
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`Petitioners' Exhibit 1004, pg. 3
`
`

`

`[Scope of Patent Claim]
`[Claim 1] A pump comprising a motor having a stator with a plurality of coils and a permanent magnet rotor, an
`impeller installed on the rotor of the motor, and a control circuit that controls conduction through the coils of the
`aforementioned motor,
`whereby the permanent magnet rotor of the motor is resin molded to constitute a molded rotor; at least a part of a
`control circuit and at least the coil of the stator are resin molded to constitute a molded stator; and the molded stator
`constitutes at least a portion of a passageway for fluid drawn in and discharged by the impeller.
`
`[Claim 2] A pump provided with a motor that has a stator with a plurality of coils and a rotor consisting of bonded
`magnets in which magnetic powder that had been mixed in resin has been permanently magnetized, an impeller that
`is installed in the rotor of the motor, and a control circuit that controls conduction through the coil of the
`aforementioned motor,
`wherein a molded stator is structured by resin molding of at least part of the aforementioned control circuit and of at
`least the aforementioned coil of the aforementioned stator to complete the structure of at least part of the channel for
`fluid that is drawn and discharged via the aforementioned impeller through the aforementioned molded stator.
`[Claim 3] The pump of the aforementioned Claims 1 and 2 in which the components comprising molded stators that
`had been resin molded among the constituent components of the control circuit are heat generating components such
`as power devices.
`[Claim 4] The pump of the aforementioned Claims 1 to 3 in which the molded stator has two discrete sections, the
`stator that is resin molded and the component of the control circuit that is resin molded, wherein both of the sections
`are electrically connected via water-proof connectors.
`[Claim 5] The pump of the aforementioned Claims 1 to 4 in which the resin of molded components including the
`stator, rotor and control circuit, is resin with high thermal conductivity.
`[Claim 6] The pump of the aforementioned Claims 1 to 5 in which the molded rotor and the molded stator are
`formed so that their surfaces that face the fluid channel are rough.
`[Claim 7] The pump of the aforementioned Claims 1 to 6 in which the resin molded components of the control
`circuit are situated near the fluid channel.
`[Claim 8] The pump of the aforementioned Claims 1, 3 to 6 in which the situated space of the molded rotor connects
`with the fluid channel and the resin molded components of the control circuit in the molded stator are situated so as
`to face the gap between the molded stator and the molded rotor.
`[Claim 9] The pump of the aforementioned Claims 1 to 8 in which heat dissipation units are attached to components
`of the resin molded control circuit in the molded stator.
`[Claim 10] The pump of the aforementioned Claim 9 in which the heat dissipation unit is installed at a site facing the
`channel through which fluid passes.
`[Claim 11] The pump of the aforementioned Claim 9 in which the heat dissipation unit is exposed within the channel
`through which fluid passes.
`Claim 12] The pump of the aforementioned Claims 1, 3 to 11 in which fluid channels extending in the axial
`direction are formed in the molded rotor.
`[Claim 13] The pump of the aforementioned Claims 1 to 12 in which the molded stator is covered by an external
`case and in which fluid channels are formed between the molded stator and the external case.
`[Claim 14] The pump of the aforementioned Claims 1, 3 to 12 in which the permanent magnet of the rotor is divided
`into a plurality of segments, the segmented permanent magnets are situated so as to have gaps separating them, and
`the resin that molded the rotor is molded so as not to block the gaps between the segmented permanent magnet.
`[Claim 15] The pump of the aforementioned Claim 14 in which the gaps among the segmented permanent magnets
`are inclined in the axial direction and are formed in spiral shape.
`[Claim 16] The pump of the aforementioned Claims 1 to 15 in which the coil of the stator is fitted to the stator core
`so as to leave gaps and in which the resin that molded the stator is molded so as not to block the gaps between the
`coils.
`[Claim 17] The pump of the aforementioned Claims 1, 3 to 16 in which the permanent magnet is a rare earth type.
`[Claim 18] The pump of the aforementioned Claims 1, 3 to 16 in which a fin is located in the molded rotor on the
`opposite side from the side on which the impeller is installed.
`[Claim 19] The pump of the aforementioned Claims 1, 3 to 18 in which the rotor shaft is integrally formed from
`molded resin and in which the resin shaft is mounted on ceramic bearings so as to freely rotate.
`[Claim 20] The pump of the aforementioned Claim 19 in which the ceramic bearings consist of ball bearings.
`
`-3-
`
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`Petitioners' Exhibit 1004, pg. 4
`
`

`

`[Claim 21] The pump of the aforementioned Claim 20 in which the ball bearings are direct ball bearings whose balls
`make direct contact with the resin shaft.
`[Claim 22] The pump of the aforementioned Claims 1 to 18 in which the rotor is structured so as to be supported in a
`manner that allows rotation by the fluid.
`[Claim 23] The pump of the aforementioned Claims 1 to 22 in which the coil is wound about a bobbin, a terminal
`connected to the coil end is installed in the bobbin and it is connected to a circuit board via the terminal.
`[Claim 24] The pump of the aforementioned Claims 1 to 23 that is fitted with a temperature sensor wherein
`conduction to the coil is controlled as a function of the temperature detected by the temperature sensor.
`[Claim 25] The pump of the aforementioned Claims 1 to 24 that is fitted with a flow rate sensor that detects the flow
`rate of fluid wherein conduction to the coil is controlled as a function of the flow rate detected by the flow rate
`sensor.
`[Detailed Description of the Invention]
`[0001]
`[Technical Field of Invention] The present invention concerns a pump in which the pump and motor are integrated,
`and especially concerns enhancement of the cooling properties.
`[0002]
`[Problems Solved by the Invention] Pumps have been structured in which the pump is integrated with the motor
`that drives it. For example, the gazette of Japanese Kokai Publication Hei-8-42482 discloses a pump in which the
`outside of the can to which is attached the stator of the motor is covered by an external case. A rotor integrated with
`an impeller is installed on the inside of the can so as to freely rotate. The cover of the aforementioned external case
`is structured as a pump casing, and the control circuit that drives the motor is situated between the can and the
`external case.
`[0003] However, the cooling properties are poor in this pump because the stator is situated between the can and the
`external case, which poses the problem of deterioration of the efficiency of the motor. Furthermore, the cooling
`properties of the electronic components that comprise the control circuit, especially the heating components such as
`the power IC, are poor because the control circuit is situated in the sealed space between the can and the external
`case. That poses the problem of decline in the performance due to temperature elevation.
`[0004] Thus, the present invention provides a pump in which the cooling properties of the stator can be enhanced
`and in which the cooling properties of the control circuit, especially of the heating component such as the power IC,
`can be enhanced.
`[0005]
`[Means of Solving the Problems] In order to attain the aforementioned objectives, the pump pursuant to the present
`invention is provided with a motor that has a stator with a plurality of coils and a permanent magnet rotor, an
`impeller that is installed in the rotor of the motor, and a control circuit that controls conduction through the coil of
`the aforementioned motor, wherein a molded rotor is structured by resin molding of the permanent magnet rotor of
`the aforementioned motor and a molded stator is structured by resin molding of at least part of the aforementioned
`control circuit and of at least the aforementioned coil of the aforementioned stator to complete the structure of at
`least part of the channel for fluid that is drawn and discharged via the aforementioned impeller through the
`aforementioned molded stator. (Claim 1)
`[0006] The molded stator in the aforementioned structure is cooled by the fluid flowing through the channel since
`the molded stator comprises at least part of the channel for fluid. The resin molded coil and components of the
`control circuit are also cooled by the fluid flowing through the channel.
`[0007] In addition, the pump is provided with a motor that has a stator with a plurality of coils and a rotor consisting
`of bonded magnets in which magnetic powder that had been mixed in resin has been permanently magnetized, an
`impeller that is installed in the rotor of the motor, and a control circuit that controls conduction through the coil of
`the aforementioned motor. A molded stator is structured by resin molding of at least part of the aforementioned
`control circuit and of at least the aforementioned coil of the aforementioned stator to complete the structure of at
`least part of the channel for fluid that is drawn and discharged via the aforementioned impeller through the
`aforementioned molded stator. This provides the same effects as those noted above. (Claim 2)
`[0008] Among the constituent components of the aforementioned control circuit, the components comprising
`molded stators that had been resin molded preferably would be heat generating components such as power devices.
`(Claim 3). In the present invention, the molded stator has two discrete sections, the stator that is resin molded and
`the component of the control circuit that is resin molded, and both of the sections are electrically connected via
`
`-4-
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`
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`Petitioners' Exhibit 1004, pg. 5
`
`

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`water-proof connectors. (Claim 4). The resin of molded components including the stator, rotor and control circuit
`preferably would be resin with high thermal conductivity. (Claim 5)
`[0009] Among the molded components including the control circuit, stator and molded rotor that are molded from
`molded resin, the sections that face the channel for fluid preferably would be formed so their surfaces would be
`rough. (Claim 6). The components of the control circuit that are molded in the molded unit preferably would be
`situated near the channel of the fluid (Claim 7). The space holding the molded rotor in the present invention
`connects with the fluid channel, and the resin molded components of the control circuit in the molded stator are
`situated so as to face the gap between the molded stator and the molded rotor (Claim 8).
`[0010] Heat dissipation units are attached to components of the resin molded control circuit in the molded stator
`(Claim 9). The aforementioned heat dissipation unit preferably would be installed at a site facing the channel
`through which fluid passes (Claim 10). In addition, the heat dissipation unit can be exposed within the channel
`through which fluid passes (Claim 11). Fluid channels extending in the axial direction can be formed in the molded
`rotor (Claim 12). The molded stator could be covered by an external case and fluid channels could be formed
`between the molded stators and the external case (Claim 13).
`[0011] The permanent magnet of the rotor preferably would be divided into a plurality of segments. The segmented
`permanent magnets would be situated so as to have gaps separating them, and the resin that molded the rotor would
`be molded so as not to block the gaps between the segmented permanent magnet (Claim 14). The gaps among the
`segmented permanent magnets could be inclined in the axial direction and formed in spiral shape (Claim 15). The
`coil of the stator preferably would be fitted to the stator core so as to leave gaps and the resin that molded the stator
`would be molded so as not to block the gaps between the coils (Claim 16).
`[0012] The permanent magnet may be a rare earth type (Claim 17). A fin can be located in the rotor on the opposite
`side from the side on which the impeller is installed (Claim 18). The rotor shaft may be integrally formed from
`molded resin and the resin shaft may be mounted on ceramic bearings so as to freely rotate (Claim 19). The ceramic
`bearings in this case may be structured from ball bearings (Claim 20). The aforementioned ball bearings may be
`direct ball bearings that make direct contact with the resin shaft (Claim 21).
`[0013] The rotor may be structured so as to be supported in a manner that allows rotation by fluid (Claim 22). The
`coil can be wound about a bobbin, a terminal connected to the coil end can be installed in the bobbin and the coil
`can be connected to a circuit board via the terminal (Claim 23). A temperature sensor can be fitted and conduction
`to the coil can be controlled as a function of the temperature detected by the temperature sensor (Claim 24). A flow
`rate sensor that detects the flow rate of fluid can be provided and conduction to the coil can be controlled as a
`function of the flow rate detected by the flow rate sensor (Claim 25).
`[0014]
`[Mode of Implementing the Invention] The first embodiment of the present invention is explained below with
`reference to Figure 1. The stator 2 of the motor 1 is structured by fitting a plurality of coils 4 to the stator core 3.
`The stator 2 is molded from resin 5 while leaving the inner periphery of the stator core 3, and this resin molded
`stator 2 constitutes a molded stator A.
`[0015] On the other hand, the rotor 6 of the motor 1 is constituted as a permanent magnet rotor in which a permanent
`magnet 8 with a plurality of magnetized poles is attached to the outer peripheral section of the cylindrical rotor core
`7. With metal shaft 9 inserted into the center of the cylindrical rotor core, the entire rotor 6 is resin-molded with
`resin 10, and this resin-molded rotor 6 constitutes a molded rotor B. Resin that has high thermal conductivity, such
`as acrylic resin, is used as the resin 5 and 10 of the molded stator A and molded rotor B. In addition, the permanent
`magnet 8 is formed from rare earth elements to increase the motor output through higher magnetization.
`[0016] A casing cover 11 made of resin is attached to the top of the aforementioned molded stator A. This casing
`cover 11 and molded stator A comprise a pump casing 12. An intake port 13 is formed in the center of the casing
`cover 11 and a discharge port 14 is formed on the joining surfaces of the casing cover 11 and the mold stator A,
`extending radially outward from the pump casing 12.
`[0017] The internal space C within the aforementioned molded stator A forms a cylinder with a bottom, and
`communicates with the internal space D of the pump casing 12. The internal space C of this molded stator A houses
`the aforementioned molded rotor B. The bottom end of the shaft 9 of the molded rotor B is inserted into the shaft
`support hole 15 formed in the molded resin 5 of molded stator A and is supported therein so as to freely rotate, while
`the top end is inserted in the shaft support hole 17 of the support frame 16 formed within the intake port 12 of the
`casing cover 11, and is supported therein so as to freely rotate.
`[0018] A plurality of vanes 18 located within the pump casing 12 are integrally fitted in the outer circumferential
`part at the top end of the molded resin 10 of the rotor 6 so as to protrude. The top of the molded rotor B from which
`
`-5-
`
`
`
`Petitioners' Exhibit 1004, pg. 6
`
`

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`the vanes 18 protrude constitutes an impeller 19. When the molded rotor B rotates, the vanes 18 of the impeller 19
`draw in fluid such as water from the intake port 13 into the pump casing 12 and discharge said fluid via the
`discharge port 14 to complete the pump action.
`[0019] At this time, part of the liquid flowing within the pump casing 12 flows into the internal space C of the
`molded stator A because the internal space C of the molded stator A is connected to the internal space D of the
`pump casing 12. Consequently, the internal space C of the molded stator A forms part of the liquid channel. The
`molded stator A and the molded rotor B are cooled by the liquid flowing within the internal space C, but to enhance
`cooling efficiency, the inner surface of the molded stator A as well as the outer surface of the molded rotor B are
`formed to be uneven .
`[0020] The motor 1 is structured as a brushless direct current motor. Conduction through the coils 4 is controlled by
`the control circuit E that is structured from a plurality of electronic components 21 fitted to the printed wiring board
`20. This printed wiring board 20 is molded together with the stator 2 using the molded stator A resin 5. The
`molding position of this printed wiring board 20 is near the upper edge of the molded stator A. Of these, high heat-
`emitting electronic components 21a such as power ICs are situated at the site constituting the discharge port 14.
`[0021] The action of the aforementioned structure is explained next. The molded rotor B is rotated by conduction in
`a predetermined sequence through a plurality of coils 4 under the control of the control circuit E. By so doing,
`liquid is taken into the internal space D of the pump casing 12 from the intake port 13 via the impeller 19 that is
`integral with the molded rotor B and is then discharged as high-pressure fluid from the discharge port 14.
`[0022] The liquid taken into the pump casing 12 then flows into the internal space C of the molded stator A to cool
`the molded stator A and the molded rotor B. Decline in the motor efficiency due to temperature elevation can be
`prevented before it happens because the stator 2, the electronic components 21 on the printed wiring board 20 and
`the rotor 6 are cooled by said circulation. At this time, the cooling performance can be enhanced further due to the
`greater amount of heat released into the liquid via the resin 5, 10 from the stator 2, electronic component 21 and
`rotor 6 because the resin 5, 10 has outstanding thermal conductivity. The area in contact with liquid is increased,
`which further enhances the cooling properties, because the inner circumferential surface of the molded stator A and
`the outer circumferential surface of the molded rotor B are formed so as to be rough.
`[0023] The cooling performance of the section in question is increased since a large amount of liquid is passed
`through the discharge port 14. The cooling capacity of the electronic components with a great amount of heating
`21a can be raised, thereby resolving the problem of common temperature elevation, since those electronic
`components 21a such as the power IC are situated near the discharge port 14.
`[0024] Figures 2 to 4 illustrate embodiments 2 to 4 of the present invention. The difference from the
`aforementioned first embodiment involves the attachment of the heat sink 22 as a heat release unit to the electronic
`components with a great amount of heating 21a such as the power IC. In the second embodiment shown in Figure 2,
`part of the heat sink 22 protrudes into the discharge port 14 of the pump casing 12. In the third embodiment shown
`in Figure 3, roughly the entire heat sink 22 protrudes into the discharge port 14 of the pump casing 12. In the fourth
`embodiment shown in Figure 4, the entire heat sink 22 and part of the electronic components 21a protrude into the
`discharge port 14 of the pump casing 12.
`[0025] Cooling of the electronic components with a great amount of heating 21a by the liquid flowing within the
`discharge port 14 can be enhanced still further by installing the heat sink 22 in this manner. Furthermore, the
`cooling capacity is even higher in the third embodiment compared to the second embodiment because the amount of
`protrusion of the heat sink 22 into the discharge port 14 is greater, while the cooling capacity is still higher in the
`fourth embodiment because part of the electronic components with a great amount of heating 21a are also protruded
`into the discharge port 14.
`[0026] Figure 5 illustrates the fifth embodiment of the present invention. The difference from the first embodiment
`lies in the fact that the printed wiring board 20 is molded at the bottom end of the molded stator A, which is the
`opposite end. As a result, high heat-emission electronic components 21a can be located near the internal space C of
`the molded stator A. Even in this constitution, high heat emission electronic components 21a can be cooled by the
`liquid circulating within the internal space C following intake via the intake port 13.
`[0027] Figures 6 and 7 illustrate embodiments 6 and 7 of the present invention. First, the difference between the
`sixth embodiment in Figure 6 and the aforementioned fifth embodiment lies in the fact that part of the electronic
`components with a great amount of heating 21a protrude into the internal space C from the bottom of the molded
`stator A. The cooling properties using this structure is elevated since the electronic component 21 makes direct
`contact with the liquid in the internal space C.
`
`-6-
`
`
`
`Petitioners' Exhibit 1004, pg. 7
`
`

`

`[0028] The difference between the seventh embodiment illustrated in Figure 7 and the aforementioned fifth
`embodiment lies in the fact that the lead of the electronic components with a great amount of heating 21a is raised,
`resulting in a structure in which the electronic component 21a is located on the inner circumferential side of the
`molded stator A. The degree of circulation of the liquid in the internal space C between the inner circumferential
`surface of the molded stator A and the outer circumferential surface of the molded rotor B is raised by rotation of the
`molded rotor B. Consequently, the cooling efficiency of the electronic component 21 can be raised.
`[0029] Figure 8 illustrates the eighth embodiment of the present invention. The difference from the aforementioned
`fifth embodiment lies in the fact that a plurality of flat fins 23 are integrally protruded in the radial direction at the
`bottom of the molded rotor B. By this constitution, the liquid found between the inside bottom of the molded stator
`A and the bottom end surface of the molded rotor B is stirred by the flat fins 22 as the molded rotor B rotates, which
`increases the amount of liquid flowing in the space, so that the cooling of the electronic component 21 can be
`increased even if electronic components 21 are situated on the inside bottom surface of the molded stator A.
`[0030] Figure 9 illustrates the ninth embodiment of the present invention. The difference from the fifth embodiment
`lies in the fact that a plurality of apertures 24 are formed as fluid channels passing vertically through the center of
`the molded rotor B. By adopting such a constitution, rotation of the molded rotor B causes negative pressure at the
`top end center part of the molded rotor B due to the pumping action of the vanes 18, so that liquid present in the gap
`between the inner bottom surface of the molded stator A and the lower edge of the molded rotor B is sucked up into
`the pump casing 12 through the apertures 24. In this circulation, the liquid discharged from the vanes 18 flows
`downward through the outer circumferential region of the molded rotor B and is again sucked up through the
`apertures 24.
`[0031] For this reason, the amount of liquid flowing between the inner bottom surface of the molded stator A and
`the lower edge surface of the molded rotor B increases, thereby raising the cooling properties of the electronic
`components 21.
`[0032] Figure 10 illustrates the tenth embodiment of the present invention. The difference from the fifth
`embodiment illustrated in Figure 5 lies in the fact that electronic components 21 are situated on both the inner
`bottom surface and the inner circumferential surface of the molded stator A. In addition, the external dimensions of
`the molded stator A are reduced, which forms a circulation passage 26 as a liquid channel between the outside of the
`molded stator A and the cylindrical external case 25. The top of the circulation passage 26 directly links to the
`discharge port 14 and links to the internal space D of the pump casing 12 via the linking aperture 27 that is formed
`in the molded stator A. It also links to the internal space C via a plurality of linking apertures 28 that are formed in
`the center of the molded stator A at the bottom.
`[0033] When the impeller 19 is rotated by the molded rotor B in this structure, part of the liquid released from the
`vanes 18 flows into the circulation passage 26 from the discharge port 14 and the linking aperture 27, after which the
`circulation passage 26 passes downward so that the liquid flows into the internal space C via the linking apertures
`28. The circulation is completed by the liquid flowing upward through the internal space C, drawn by the vanes 18.
`By so doing, the electronic components 21 situated at the bottom sides and the inner circumferential surface sides of
`the molded stator A are cooled more efficiently.
`[0034] Figure 11 illustrates the eleventh embodiment of the present invention. This embodiment differs from the
`aforementioned tenth embodiment in that the molded stator A is formed to be even smaller, and the coil 4 is molded
`to form a cylinder with a bottom, exposing part of the stator core 3, with the outside thereof covered by an outside
`case 25, and the cross sectional area of the circulation channel between the two is enlarged. Furthermore, by making
`the molded stator A still smaller, apertures 29 are formed in the outer circumferential section of the stator core 3
`protruding into the circulation passage 26 as vertically-penetrating fluid channels to circulate downward the liquid
`that had entered the circulation passage 26.
`[0035] The liquid circulating within the circulation passage 26 can directly cool the stator core 3, and the amount of
`liquid circulating in the circulation passage 26 can be increased by adopting such a structure.
`[0036] Figures 12 and 13 illustrate the twelfth embodiment of the present invention. This embodiment differs from
`the aforementioned first embodiment in that the molded stator A comprises the main molded unit 30 in which the
`stator 2 is resin molded and the auxiliary molded unit 31 in which the printed wiring board 20 is resin molded.
`[0037] The printed wiring board 20 and the stator core 3 are electrically connected by a waterproof connector 32
`shown in Figure 13. The waterproof connector 32 comprises a male connector 33 and a female connector 34.
`Sealing material 36 is packed in the outgoing section of the lead wire 35 to prevent water from entering the
`connectors 33, 34. Furthermore, packing 37 is fitted at the site of engagement of the connector 33 with the
`connector 34.
`
`-7-
`
`
`
`Petitioners' Exhibit 1004, pg. 8
`
`

`

`[0038] In addition, the production properties are enhanced since the stator 2 and the printed wiring board 20 can be
`resin molded individually as the molded stator A is split in two. Furthermore, electrical connection of the two is
`easy since they are provided with connectors 33, 34, and deterioration of the insulation due to water intrusion can be
`prevented because of the waterproof structure.
`[0039] Figure 14 illustrates the thirteenth embodiment, structured so as to permit replacement of the liquid within
`the internal space C by the permanent-magnet rotor 6. Specifically, the rotor 6 comprises the cylindrical rotor core
`7, about the periphery of which is fitted the permanent magnet 8. However, the permanent magnet 8 in this
`embodiment is divided into multiple parts in the number circumferential direction. Gaps G are formed between the
`individual split permanent magnets 8a. The rotor 6 is molded from resin 10 so that rotor 6 would remain between
`the individual split permanent magnets 8a. The surface area of the molded rotor B in contact with the liquid is
`increased by leaving gaps G in this manner and a stirring action of liquid is realized, which elevate the cooling
`effects.
`[0040] Figure 15 illustrates the fourteenth embodiment of the present invention. The differences from the
`aforementioned thirteenth embodiment lie in the fact that the individual split permanent magnets 8a are positioned
`so that each gap G formed between them is slanted or forms a spiral shape. The direction of slope of each gap G is
`fixed so as to slope in the direction of rotation of the rotor 6 facing upward. By adopting such a structure, each gap
`G acts as an impeller groove when the molded rotor B rotates, resulting in upward circulation of liquid within the
`internal space C. This increases the amount of liquid flowing into the internal space C and thereby enables the
`cooling capacity to be elevated.
`[0041] Figure 16 illustrates the