CN210101586U

CN210101586U - Wiper and driver thereof

Info

Publication number: CN210101586U
Application number: CN201920200979.5U
Authority: CN
Inventors: 陈雯; 陈睿池; 贾新坡; 刘剑宁; 王俊君
Original assignee: Bosch Automotive Products Changsha Co Ltd
Current assignee: Bosch Automotive Products Changsha Co Ltd
Priority date: 2019-02-15
Filing date: 2019-02-15
Publication date: 2020-02-21
Anticipated expiration: 2029-02-15

Abstract

The application discloses a wiper and a driver thereof. The driver includes: the transmission mechanism comprises a shell, a rotating transmission part and an output shaft which rotates together with the transmission part are arranged in the shell; first and second terminals disposed adjacent the drive member and stationary relative to the housing; a movable terminal attached to the transmission member; the movable terminal is short-circuited to the first terminal through the output shaft, so that the conduction state between the movable terminal and the second terminal is changed when the transmission component rotates to a certain angle. The structure is simple and reliable, and the cost of parts is saved.

Description

Wiper and driver thereof

Technical Field

The present application relates to a wiper and a driver thereof.

Background

Wipers for vehicles remove rainwater, snow, fallen leaves, deposits, and the like from windshields, backlights, or headlights of certain models of vehicles. Generally, when a wiper switch is turned on, a wiper motor starts to rotate and this motion is converted into a reciprocating motion of a wiper blade out of a windshield, so that the wiper blade reciprocally scrapes the windshield to improve visibility during driving. The rear window glass and the wiper at the front lamp can be respectively used for improving the visibility of the rear view and the lighting effect of the front lamp.

In order to be able to return the wiper to its parked position after the wiper switch has been switched off, in order not to obstruct the view of the driver, it is known to provide a wiper parking signal element inside the wiper. Fig. 1 shows an application of a parking technique of a wiper in the related art. The so-called parking signal element comprises two stationary parking terminals 11', 12' and one moving terminal 20 '. The movable terminal 20 'is arranged on the end face of the transmission gear 18' inside the wiper and rotates with the transmission gear 18', once the movable terminal 20' is simultaneously contacted with the parking terminals 11', 12', the two parking terminals 11', 12' are conducted and send out parking signals. And after receiving the parking signal, the motor controller commands the motor to stop.

The two parking terminals 11', 12' comprise pins 21', 22' and contact reeds 24', 26', respectively, one of the pins 21 'being monitored by the motor controller and the other pin 22' being connected to ground. The moving terminal 20' is a contact plate 28' made of conductive material that needs to be mounted to the drive gear 18 '. These elements constitute a parking circuit connected to the monitored pin 21' of the parking terminal-the contact reed 24' -the contact pad 28' -the contact reed 26' -the pin 22' which is grounded. The transmission gear 18 'is also connected to an output shaft 16' for connecting the wiper arm. Mounting the drive gear 18', output shaft 16' and contact disc 28' together requires at least two steps, first molding the drive gear onto the output shaft and then assembling the contact disc onto the molded drive gear.

SUMMERY OF THE UTILITY MODEL

At least one technical problem to be solved by the present application is to provide a wiper drive that saves some additional conductive parts in the drive.

The application relates to a driver comprising: the transmission mechanism comprises a shell, a rotating transmission part and an output shaft which rotates together with the transmission part are arranged in the shell; a first terminal and a second terminal near the drive member that are stationary relative to the housing, a movable terminal attached to the drive member; the movable terminal is short-circuited to the first terminal through the output shaft, so that the conduction state between the movable terminal and the second terminal is changed when the transmission component rotates to a certain angle.

The term "short" herein refers to a short connection on a circuit, and may be a physical connection between objects that can conduct electricity, such as a contact connection, where a contact connection may be a direct contact between two objects, or an indirect connection between two objects through a third or even more other objects with conductive properties, and a short connection between objects through a conductive line.

In the above-described driver, the movable terminal has a connecting portion that contacts the output shaft.

In the above driver, the movable terminal is provided on an end surface of the transmission member, the output shaft passes out of the transmission member, and the connecting portion is a radially extending section of the movable terminal toward the output shaft.

In the above driver, the transmission member is made of a non-conductive material and is molded, and the output shaft and the movable terminal are manufactured as an insert together with the transmission member at the time of molding.

In the above driver, the output shaft is short-circuited to the case, and the case is short-circuited to the first terminal, thereby establishing an electric circuit between the movable terminal and the first terminal. The driver to which the present application relates may use a parking circuit different from the prior art.

In the above driver, the output shaft and the housing are short-circuited by: an axially extending conductive bearing is arranged in the shell, and the output shaft is mounted in the shell through the bearing.

In the above driver, the housing and the first terminal are short-circuited by: the shell is internally provided with a conductive sheet inserted on the inner wall of the shell, and the first terminal is constructed by welding the conductive sheet.

In the above driver, the second terminal has a spring for contacting the movable terminal.

In the above driver, the first and second terminals are mounted on a cover fitted to the housing.

Another aspect of the present application relates to a wiper including a driver, a reversing mechanism, the reversing mechanism being in linkage with an output shaft within the driver; a wiper arm connected to the reversing mechanism and oscillating reciprocally via the reversing mechanism; and a wiper blade manipulated by the wiper arm; when the transmission part of the driver rotates to a certain angle, the driver stops outputting, and the scraping arm swings to a parking position.

The parking circuit between the movable terminal and the first terminal is replaced by the original movable terminal electrically connected to the first terminal via contact with the spring plate, and the movable terminal is short-circuited to the first terminal via the output shaft, and the first terminal can thus be provided with no spring plate. Therefore, only the original parking circuit is reserved between the reed of the second terminal and the movable terminal, and the movable terminal only needs to be in contact with one reed, so that the contact area of the movable terminal can be reduced.

The new parking circuit of the present application uses the original components in the wiper, thus not increasing the design, material and process investment, bringing cost savings potential.

In addition, the movable terminal reduces the contact with the fixed terminal in the rotation process of the transmission component to change the conduction state of the parking circuit, so that the wiper can more reliably exert the parking function.

Further, the mounting step of the movable terminal is simplified. The movable terminal, the output shaft and the transmission part can be integrated together only by one molding step.

Other aspects and features of the present application will become apparent from the following detailed description, which proceeds with reference to the accompanying drawings. It is to be understood, however, that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the application, for which reference should be made to the appended claims. It should be further understood that the drawings are merely intended to conceptually illustrate the structures and procedures described herein, and that, unless otherwise indicated, the drawings are not necessarily drawn to scale.

Drawings

The present application will be more fully understood from the detailed description given below with reference to the accompanying drawings, in which like reference numerals refer to like elements throughout the views. Wherein:

FIG. 1 is a schematic view of an embodiment of a prior art wiper;

fig. 2 is a sectional view of an embodiment of a wiper according to the present application.

Detailed Description

To assist those skilled in the art in understanding the subject matter claimed herein, specific embodiments thereof are described below in detail with reference to the accompanying drawings.

FIG. 2 illustrates a schematic view of an embodiment of a wiper to which the present application relates. Referring to fig. 2, the wiper includes a housing 12 and a cover that mates with the housing but is not shown in the figures. The housing 12 may be a metal piece and the cover may be a plastic piece. A transmission gear 14 is disposed as a transmission member in the housing 12, and an output shaft 18 passes through the transmission gear 14. The output shaft end will also be connected to the wiper arm to transmit motor torque. A reversing mechanism, not shown, is also provided in the wiper and is linked to the output shaft and connected to the wiper arm. The scraping arm swings back and forth under the influence of the reversing mechanism, so that a scraping blade on the scraping arm is driven to wipe the glass.

Also disposed within housing 12 are first and

second parking terminals

24, 26 spaced from one another, first parking terminal 24 including a first pin 32. Second parking terminal 26 includes second pin 34 and spring 44. Both

parking terminals

24, 26 are mounted on the cover. When the cover is mounted to the housing 12, the spring 44 extends toward the end face of the drive gear 14 such that the spring 44 abuts against and makes contact with the movable terminal 52 on the drive gear 14 when the drive gear 14 is rotated to an angle.

As can be seen, a conductive strip 62 is provided on the inner wall of the housing 12. The conductive tab 62 is bent to fit over the inner wall and maintain good contact with the inner wall. One end of the first pin 32 is connected to the conductive plate 62 in any desired manner. As in the embodiment shown, the first lead 32 is soldered to the conductive sheet 62. The conductive pads 62 may also provide pin connections for other electronic components.

The first leg 32, the second leg 34 and the spring 44 are all made of an electrically conductive material. First parking terminal 24 is a ground terminal and first pin 32 may be connected to a ground output of a nearby component, such as a ground connection of the first pin to a power supply not shown. The motor controller monitors the second pin 34 for a parking signal that can be received at the second parking terminal 26. The above-described external connection arrangements of first parking terminal 24 and second parking terminal 26 are interchangeable, i.e., first parking terminal 24 is monitored by the motor controller and second parking terminal 26 serves as ground.

In the illustrated embodiment, the movable terminals 52 are provided as contact pad structures made of an electrically conductive material. The output shaft 18 is a metal member. The contact disk is shorted to the output shaft. As shown, the contact disc has a connecting portion 54, the drive gear 14 is centrally provided with a raised step 16, the output shaft 18 is received in the step 16 leaving a space between the step 16 and the end face of the drive gear 14, and the connecting portion 54 for the contact disc extends into connection with the output shaft 18. The drive gear 14 may be molded by separately manufacturing the output shaft 18 and the contact plate, placing the output shaft 18 and the contact plate in a mold, placing the output shaft 18 and the contact plate in contact with the output shaft 18 with the connecting portion 54, introducing a non-conductive material liquid such as a plastic liquid, cooling to solidify, and finally molding the drive gear 14, the output shaft 18, and the contact plate together.

The contact disk is not limited to the above-described manufacturing method and the above-described structure for achieving the connection and fixation with the output shaft. The short circuit of the contact disc and the output shaft is not limited to direct contact, and can be circuit connection.

The output shaft 18 is shorted to the first parking terminal 24 via the housing 12. As shown, the drive gear 14 is disposed within the housing 12, and a metal sintered bearing 22 is disposed within the housing 12, with the output shaft 18 being positioned on the housing 12 by the bearing 22. The bearing 22 extends a distance in the axial direction whereby the bearing 22 provides good electrical conductivity between the housing 12 and the output shaft 18. When the drive gear 14 with the output shaft 18 and the moving terminal 52 is mounted to the housing, an electrical circuit is formed between the moving terminal 52, the output shaft 18, the bearing 22, the housing 12, the conductive tab 62 and the first parking terminal 24, whereby the moving terminal 52 is shorted to the first parking terminal 24.

It is also contemplated that the moving terminal 52 is shorted to the first parking terminal 24 via the output shaft through other paths using existing components on the wiper.

When the movable terminal 52 rotates along with the transmission gear 14 and the movable terminal 52 rotates to contact the spring 44, the movable terminal 52 is conducted with the second parking terminal 26, and a parking signal is generated between the first and

second parking terminals

24 and 26.

When the wiper switch is pressed off, the motor controller starts monitoring the parking signal of the second parking terminal 26, and once this signal is monitored, the motor is controlled to stop rotating, at which time the wiper arm just swings to the parking position. The parking signal may also be a signal indicating that the circuit is disconnected between the first and second parking terminals, for example, when the movable terminal rotates to a certain angle, the motor controller monitors that the first parking terminal and the second parking terminal are not connected, and then commands the motor to stop rotating.

The housing 12, the conductive plate 62, the bearing 22 and the output shaft 18 are all structures already existing in a wiper, and these components can be directly utilized without redesign, and the moving terminal 52 is designed to be short-circuited to the first parking terminal 24 via the output shaft 18, thereby establishing a new parking line between the first parking terminal 24 and the moving terminal 52 by using the above components. The wiring between the first parking terminal 25 and the moving terminal 52 can also serve as other applications requiring electrical connection of the housing to the transmission component. Therefore, the first and

second parking terminals

24 and 26 are not limited to terminals as parking elements, and the circuit between the first and

second parking terminals

24 and 26 and the moving terminal 52 is not limited to the parking function, and can be applied to other circuits requiring the rotational position of the transmission member or the wiper arm to be obtained.

While specific embodiments of the present application have been shown and described in detail to illustrate the principles of the application, it will be understood that the application may be embodied otherwise without departing from such principles.

Claims

1. An actuator for a wiper, comprising:

a housing (12) in which a rotatable transmission member and an output shaft (18) rotating together with the transmission member are provided;

first and second terminals disposed adjacent the drive member and stationary relative to the housing;

a movable terminal (52) attached to the transmission member; the method is characterized in that:

the movable terminal (52) is short-circuited to the first terminal through the output shaft (18), so that the conduction state between the movable terminal (52) and the second terminal is changed when the transmission component rotates to a certain angle.

2. The actuator for a wiper as defined in claim 1, wherein: the movable terminal has a connecting portion (54) that contacts the output shaft.

3. The actuator for a wiper as defined in claim 2, wherein: the movable terminal (52) is provided on an end surface of the transmission member through which the output shaft (18) passes, and the connecting portion (54) is a section of the movable terminal that extends radially toward the output shaft.

4. An actuator for a wiper according to any one of claims 1 to 3, wherein: the transmission member is made of a non-conductive material and is formed by molding, and the output shaft and the movable terminal are manufactured together with the transmission member as an insert at the time of molding.

5. An actuator for a wiper according to any one of claims 1 to 3, wherein: the output shaft (18) is shorted to the housing (12), and the housing (12) is shorted to the first terminal, thereby establishing an electrical circuit between the movable terminal (52) and the first terminal.

6. The actuator for a wiper as defined in claim 5, wherein: an axially extending electrically conductive bearing (22) is provided in the housing, through which the output shaft is mounted in the housing.

7. The actuator for a wiper as defined in claim 5, wherein: a conductive sheet (62) is disposed in the housing and is inserted into an inner wall of the housing, and the first terminal is configured to be welded to the conductive sheet.

8. An actuator for a wiper according to any one of claims 1 to 3, wherein: the second terminal has a spring (44) for contacting the movable terminal.

9. An actuator for a wiper according to any one of claims 1 to 3, wherein: the first and second terminals are mounted on a cover that mates with the housing.

10. A wiper, characterized in that said wiper comprises:

a driver according to any one of claims 1-9;

the reversing mechanism is linked with an output shaft in the driver;

a wiper arm connected to the reversing mechanism and oscillating reciprocally via the reversing mechanism; and

a wiper blade manipulated by the wiper arm;

when the transmission part of the driver rotates to the certain angle, the driver stops outputting, and the scraping arm swings to a parking position.