Wiper system for a vehicle with a screen wash system

Patent metadata

Field	Value
Publication number	US-2016016557-A1
Application number	US-201514796282-A
Country	US
Kind code	A1
Filing date	Jul 10, 2015
Priority date	Jul 17, 2014
Publication date	Jan 21, 2016
Grant date	—

Abstract

A drive motor for at least one wiper arm intended to wipe a glazed surface of a motor vehicle is disclosed. The motor includes a cam surface linked in concentric rotation with a rotary shaft of the drive motor, and static cam reading means able to cooperate with said cam according to the angular positions occupied by said cam to generate electrical control signals varying as a function of the angular position of the wiper arm on the glazed surface. The cam has a first circular conductive track, a second semi-circular conductive track concentric to the first conductive track and connected to same via a conductive bridge, in which the static reading means are formed by three sliding contacts able to make and break electrical contact with respectively the first and second conductive tracks and the conductive bridge depending on the angular positions occupied by said cam.

First claim

1 . A drive motor for at least one wiper arm intended to wipe a glazed surface of a motor vehicle, the motor comprising:
a cam surface linked in concentric rotation with a rotary shaft of the drive motor; and static cam reading means able to cooperate with said cam according to angular positions occupied by said cam to generate electrical control signals varying as a function of the angular position of the wiper arm on the glazed surface, wherein the cam has a first circular conductive track, a second semi-circular conductive track concentric to the first conductive track and connected to same via a conductive bridge, and wherein the static reading means are formed by three sliding contacts able to make and break electrical contact with respectively the first and second conductive tracks and the conductive bridge depending on the angular positions occupied by said cam.

2 . The drive motor according to claim 1 , wherein the first and second conductive tracks and the conductive bridge are made from a single part.

3 . The drive motor according to claim 1 , wherein the first conductive track is linked to ground via the related sliding contact.

4 . The drive motor according to claim 1 , wherein the sliding contact related to the second conductive track is linked to a pump.

5 . The drive motor according to claim 1 , wherein the sliding contact related to the conductive bridge is linked to a control terminal of the drive motor to indicate the stopped position.

6 . The drive motor according to claim 1 , wherein the second conductive track and the conductive bridge are located inside the first conductive track.

7 . The drive motor according to claim 1 , wherein length of the second conductive track corresponds to an angle defining the spray function of a screen wash system.

8 . The drive motor according to claim 7 , wherein the spray function is defined to spray when the wiper blades are moving upwards.

9 . The drive motor according to claim 1 , wherein the first and second conductive tracks and the conductive bridge are made of a conductive material such as brass.

10 . The drive motor according to claim 1 , wherein the conductive bridge is oriented radially in relation to the axis of rotation of the cam.

11 . A wiper system for a glazed surface of a motor vehicle having a screen wash system that can be used in combination with a tank containing screen wash, said wiper system comprising:
a drive motor according to claim 1 ; and the screen wash system comprising a pump intended to be linked fluidly firstly to said tank and secondly to at least one nozzle able to deliver a jet of liquid onto the glazed surface of the vehicle.

Assignees

• Valeo Systemes Dessuyage

Inventors

• Jendraszczak Jean
• Blanchet Pierre
• Princet Joël
• Gallaud Eric

Classifications

• B60S1/50

  Arrangement of reservoir · CPC title

• H02K11/21

  Devices for sensing speed or position, or actuated thereby (specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14) · CPC title

• B60S1/483 Primary

  using a supply pump driven by the windscreen-wiper motor · CPC title

• B60S1/08

  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)} · CPC title

• B60S1/482 Primary

  combined with the operation of windscreen wipers · CPC title