# US 11,440,507 B2 · Gearmotor for automotive vehicle wiper system

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- Number: US 11,440,507 B2
- Document ID: US11440507B2
- Status: Granted
- Kind: B2
- Application number: 16/212,005
- Filed: 2018-12-06
- Published: 2019-06-13
- Granted: 2022-09-13
- Earliest claimed: 2017-12-08
- Assignees: Valeo Systèmes d'Essuyage
- Applicants: Valeo Systèmes d'Essuyage
- Inventors: Jose Luis Herrada
- Web page: https://patentgrep.com/patent/US11440507B2

## CPC

- B60S 1/26: by toothed gearing
- F16H 57/0417: {Heat exchangers adapted or integrated in the gearing}
- B60S 1/08: electrically driven {(conjoint control of windscreen wiper motor and liquid supply of windscreen washer B60S1/482; conjoint control of windscreen wiper motor and means for cleaning parts o parts other than windscreens or front windows B60S1/56, B60S1/58, B60S1/606)}
- B60S 1/166: {characterised by the combination of a motor-reduction unit and a mechanism for converting rotary into oscillatory movement}
- F16H 1/16: comprising worm and worm-wheel
- F16H 57/039: Gearboxes for accommodating worm gears
- F16H 57/0412: {Cooling or heating; Control of temperature}
- F16H 57/0415: {Air cooling or ventilation; Heat exchangers; Thermal insulations}
- F16H 57/0416: {Air cooling or ventilation}
- F16H 57/0476: {Electric machines and gearing, i.e. joint lubrication or cooling or heating thereof}
- F16H 57/0498: {Worm gearings}
- H02K 7/085: {radially supporting the rotary shaft at only one end of the rotor (H02K7/086, H02K7/09 take precedence)}
- H02K 7/1166: {comprising worm and worm-wheel (structural association with bearings specially adapted for worm gear drives H02K7/081)}
- H02K 9/06: with fans or impellers driven by the machine shaft
- H02K 11/215: Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
- H02K 21/14: with magnets rotating within the armatures
- F16H 2057/02034: {Gearboxes combined or connected with electric machines}
- F16H 2057/02082: {for application in vehicles other than propelling, e.g. adjustment of parts}
- B60S: SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- F16H: GEARING
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

The invention relates to a geared motor (1) for a motor-vehicle wiping system comprising an electric motor (2) comprising a rotor (20) including magnetic elements, a stator (21) having the electromagnetic excitation windings of the rotor, a rotary shaft (22) rigidly connected to the rotor, a reduction gear (3) linking the rotary shaft (22) and an output shaft of the geared motor, a casing (4) forming a protective envelope for said reduction gear, or the electric motor (2), and in which said reduction gear (3) includes a worm screw and worm wheel gear, the worm screw (30) being rigidly connected to the rotary shaft of the rotor (22), the worm wheel (31) rigidly connected to an output shaft (8) of the geared motor, bearing means (23, 24) for guiding the rotary shaft of the rotor (22) in rotation in relation to the casing (4), and potentially, a determination device for determining the angular position of the rotor including a multi-pole magnet (5) that is rigidly connected to the rotary shaft (22) of the rotor (20).

## Claims

### Claim 1

A geared motor for a motor-vehicle wiping system comprising:
an electric motor including:
a rotor including magnetic elements,
a stator having an electromagnetic excitation windings of the rotor,
a rotary shaft rigidly connected to the rotor,
a reduction gear linking the rotary shaft and an output shaft of the geared motor,
a casing forming a protective envelope for said reduction gear, or the electric motor,
wherein said reduction gear includes a worm screw and a worm wheel gear, the worm screw being rigidly connected to the rotary shaft of the rotor, the worm wheel gear being rigidly connected to the output shaft of the geared motor,
bearing means for guiding the rotary shaft of the rotor in rotation in relation to the casing, and
a determination device for determining an angular position of the rotor including a multi-pole magnet that is rigidly connected to the rotary shaft of the rotor;
at least one heat sink in the form of an element projecting radially from the rotary shaft that is distinct from the bearing means and distinct from the multi-pole magnet; and
a hollow support attached proximate a longitudinal end of the rotary shaft and arranged coaxial to and constrained to rotate with the rotary shaft, wherein the hollow support bears said magnetic elements about a circumference thereof,
wherein said hollow support comprises a sleeve for attachment with said rotary shaft,
wherein said bearing means include a bearing for guiding an end of the rotary shaft opposite a stator-side of the electric motor in a direction of the rotary shaft, and with reference to said worm screw and in which the at least one heat sink is arranged close to the worm screw on said rotary shaft, in an intermediate position between the worm screw and said bearing on a side opposite the stator of the electric motor, the at least one heat sink having an internal bush for assembling the rotary shaft, the at least one heat sink forming a heat-exchange surface with an internal atmosphere of the casing,
wherein the at least one heat sink has a peripheral surface positioned locally facing the worm wheel and inclined in relation to an axis of the rotary shaft such as to be locally oriented substantially tangentially to the worm wheel,
wherein the at least one heat sink has fins arranged along and parallel to the longitudinal axis of the rotary shaft and perpendicular to the rotary shaft.

### Claim 2 (depends on 1)

The geared motor according to claim 1, wherein the at least one heat sink is arranged in an immediate vicinity of the worm wheel, said peripheral surface positioned at a distance equal to or less than 4 mm from the worm wheel when the worm wheel is in rotation.

### Claim 3 (depends on 1)

The geared motor according to claim 1, wherein the at least one heat sink is made of a material with thermal conductivity equal to or greater than 1 W·m−1·K−1.

### Claim 4 (depends on 3)

The geared motor according to claim 3, wherein the material used to make the at least one heat sink is metal.

### Claim 5 (depends on 3)

The geared motor according to claim 3, wherein the material used to make the at least one heat sink is a plastic reinforced with metal particles.

### Claim 6 (depends on 1)

The geared motor according to claim 1, wherein said bearing means include a bearing for guiding the rotary shaft on a side of the electric motor with the stator with reference to said worm screw, referred to as a stator-side bearing.

### Claim 7 (depends on 6)

The geared motor according to claim 6, wherein the bearing means comprise exclusively the stator-side bearing and the bearing on the side opposite the stator, for guiding two ends of the rotary shaft respectively.

### Claim 8 (depends on 1)

The geared motor according to claim 1, wherein the fins are arranged about an axis of rotation of the at least one heat sink and form ventilation blades constrained to rotate with the rotary shaft.

### Claim 9 (depends on 1)

The geared motor according to claim 1, wherein said hollow support covers said bearing.

### Claim 10 (depends on 1)

The geared motor according to claim 1, wherein said hollow support extends axially beyond the longitudinal end of said rotary shaft such that said magnetic elements are arranged at least partially beyond the longitudinal end of said rotary shaft.

### Claim 11 (depends on 1)

The geared motor according to claim 1, wherein said sleeve is attached in an intermediate position on said rotary shaft between said reduction gear and said bearing.