# US 10,873,233 B2 · Case of electric apparatus and manufacturing method therefor

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- Number: US 10,873,233 B2
- Document ID: US10873233B2
- Status: Granted
- Kind: B2
- Application number: 15/738,205
- Filed: 2015-10-08
- Published: 2018-06-28
- Granted: 2020-12-22
- Earliest claimed: 2015-10-08
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Hideya Nishikawa; Yoshihito Asao; Tomo Ide
- Web page: https://patentgrep.com/patent/US10873233B2

## CPC

- H02K 5/10: with arrangements for protection from ingress, e.g. water or fingers
- C08L 83/04: Polysiloxanes
- C09K 3/10: {Materials in mouldable or extrudable form} for sealing or packing joints or covers (filling pastes C09D5/34)
- C09K 3/1018: {Macromolecular compounds having one or more carbon-to-silicon linkages}
- F16J 15/14: by means of granular or plastic material, or fluid
- H02K 11/30: Structural association with control circuits or drive circuits
- H02K 15/12: Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines
- H02K 15/14: Casings; Enclosures; Supports
- H05K 5/062: {sealed by a material injected between a non-removable cover and a body, e.g. hardening in situ}
- C08G 77/12: containing silicon bound to hydrogen
- C08G 77/20: containing silicon bound to unsaturated aliphatic groups
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

There is provided a case of an electric apparatus and the manufacturing method therefor in which a sealing material, the portion of which at the depth is cured without being heated, is utilized at the junction portion of two or more case members. The case of the electric apparatus has a gap forming portion that form a gap in a junction portion where two or more case members for containing an electric apparatus are joined to each other and a sealing material filled into the gap between the gap forming portion; the sealing material is a two-liquid-mixed addition-reaction-curable sealing material that has a normal-temperature curability and includes a platinum catalyst.

## Claims

### Claim 1

A manufacturing method for a case of an electric apparatus, the method comprising:
an assembly process in which two or more case members are combined with each other while an electric apparatus is contained therein and an uncured two-liquid-mixed sealing material is filled into a gap formed in a junction portion where the two or more case members are joined to each other; and
a heating process in which the sealing material filled in the assembly process is heated,
wherein in the heating process, heating is performed to such an extent that all of the sealing material is not completely cured,
wherein after the heating process, there is implemented an air-leak check process in which an air-leak check is applied to the gap into which the sealing material is filled, and
wherein the sealing material is a two-liquid-mixed addition-reaction-curable sealing material that is curable at a temperature of 25° C., is thermally curable by the heating in the heating process, and includes a platinum catalyst,
wherein as the gap, an inner gap and an outer gap that is provided outside the inner gap and opens toward the outside are formed,
wherein the heating process, radiant heat of a heater is radiated onto a surface of a filled portion of the sealing material filled in the outer gap, from outside of the junction portion,
wherein in the heating process, a heating time is set to such an extent that an outer side surface portion of the sealing material is completely cured, but an inner side depth of the sealing material is not completely cured,
wherein the inner gap is formed of a metal component to which heat of heat-generating members of one or both of a motor and a motor control apparatus, as the electronic apparatus, is transferred,
wherein heat of one or both of a coil of the motor and a power module that is included in the motor control apparatus and is provided with a switching device is transferred to the metal component, and
wherein after the air-leak check process, or between the heating process and the air-leak check process, or between the assembly process and the heating process, there is implemented an operation test process in which an operation test is applied to the motor and the motor control apparatus, and the inner side depth is cured by heat of the metal component heated by the operation test.

### Claim 2 (depends on 1)

The manufacturing method for a case of an electric apparatus according to claim 1, wherein in the heating process, heating of the sealing material is performed in such a way that a holder holding the two or more case members is rotated.

### Claim 3 (depends on 1)

The manufacturing method for a case of an electric apparatus according to claim 1,
wherein after the air-leak check process, there is implemented a during-shipment complete curing process in which while preparation for a shipment and the shipment are implemented, the whole of the sealing material is completely cured.

### Claim 4 (depends on 1)

The manufacturing method for a case of an electric apparatus according to claim 1, wherein the sealing material is a silicone having a radical (—Si—CH2—CH2—Si—) obtained by applying a platinum-catalyst crosslink to a first silicone, as a first liquid, having a radical (—Si—H) and a second silicone, as a second liquid, having a radical (—Si—CH═CH2).