# US 4,399,384 A · Sealed-type D.C. electric motor having reduced diametrical bulk

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- Number: US 4,399,384 A
- Document ID: US4399384A
- Status: Granted
- Kind: A
- Application number: 06/186,206
- Filed: 1980-09-10
- Granted: 1983-08-16
- Earliest claimed: 1979-10-04
- Inventors: Guido Lucherini
- Web page: https://patentgrep.com/patent/US4399384A

## CPC

- H02K 5/148: {Slidably supported brushes}
- H02K 13/006: {Structural associations of commutators}
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A rotor for a D.C. electric motor is disclosed, in which the rotor has a frontally arranged collector on which brushes are active, which are oriented parallel to the rotor axis. This arrangement considerably reduces the diametrical bulk of the motor. The brush angle is adjustable by means of an annular ring, internally threaded to the yoke.

## Claims

### Claim 1

A D.C. electric motor comprising a stator yoke, a first end shield secured to one end of said yoke, a second end shield secured to the opposite end of said yoke, thin permanent stator magnets fixedly carried to said yoke, an armature rotatably journalled in said end shields in cooperating relation to said stator magnets, said armature having a collector at one end thereof facing an adjacent one of said end shields in axially opposed relation, brushes carried by said one end shield for axial movement relative to said one shield to engage said collector, and mounting means mounting said one end shield for rotation about the axis of said armature for rotationally positioning said brushes relative to said stator magnets, said mounting means including a mounting ring threadedly rotationally secured to the interior of said yoke adjacent longitudinal ends of said stator magnets, and longitudinal tie members extending between said one end shield and said ring, and a screw threaded connection between the interior of said yoke and said ring whereby said ring is interlocked with said yoke against longitudinal displacement relative to said yoke when threadably rotationally positioned.

### Claim 2 (depends on 1)

An electric motor according to claim 1 wherein said ring generally lies within an axial projection of said magnets.

### Claim 3 (depends on 1)

An electric motor according to claim 1 wherein said ring generally lies within an axial projection of said magnets and encircles a portion of said armature.

### Claim 4 (depends on 1)

An electric motor according to claim 1 wherein said one end shield includes a body portion sealed with and forming an extension of said yoke.

### Claim 5 (depends on 1)

An electric motor according to claim 1 wherein there is an end cap sealingly engaging said one shield.