WO2014056432A1

WO2014056432A1 - A wiper motor and a windshield wiper device with the motor.

Info

Publication number: WO2014056432A1
Application number: PCT/CN2013/084914
Authority: WO
Inventors: 霍尔策⋅T; 克斯特斯⋅M; 杨素林; 徐凯凯; 杨元浩; 刘名杰; 崔国强; 杜德克•A; 卡斯廷格尔•G
Original assignee: 博世汽车部件(长沙)有限公司
Priority date: 2012-10-12
Filing date: 2013-10-09
Publication date: 2014-04-17
Also published as: DE112013004984T5; CN203056774U

Abstract

A wiper motor for windscreen wiper drive in vehicle has a housing, which includes a plastic base (1) and an upper lid made of a conductive material. The upper lid is assembled with the base in a form-fit manner. A control circuit is fixed in the housing. The control circuit includes a grounding component (6) and the first electronic components (3a, 3b) which are connected with earth. The grounding component (6) is made of metal, and it includes a flat main body (6.1) and a grounding section (6.2), which extends up over the main body (6.1). The grounding section (6.2) contacts with the fitted upper lid. The grounding component (6) also includes a first contacting section (6.5), which extends from the grounding section (6.2) apart from the main body (6.1). The grounding pins of the first electronic components (3a, 3b) are welded with the surface of the first contacting section (6.5). The structure of the grounding component (6) can save the cost of manufacture and mounting.

Description

Wiper motor and wiper with such motor

Technical field

The present invention generally relates to a motor for a vehicle wiper, and the present invention also relates to a vehicle wiper having such a motor. Background technique

Wipers are widely used in modern cars. Typically, the wiper includes a motor. The motor has a motor housing. The control circuit of the motor is also generally disposed within the motor housing. To reduce weight and save costs, the housing is mostly made of plastic.

Figure 1 shows a prior art wiper motor housing. For ease of explanation, only a part of the motor housing relating to the control circuit is shown here. As shown in Fig. 1 (a), the wiper motor housing includes a plastic base 1. On the plastic base 1, for example, electronic components such as capacitors 3a, 3b and diodes 5a belonging to the control circuit are mounted. The capacitors 3a, 3b are seated in an integrally molded receptacle on the base 1, and for fixing, a metal fixing cover 4 is fastened to the capacitors 3a, 3b. The metal fixing cover 4 serves two purposes: 1. Fixing the capacitors 3a, 3b in the base 1; 2. The corresponding pins of the capacitors 3a, 3b are in contact with a portion of the metal fixing cover 4, thereby being in the wiper motor housing After the metal cover (not shown) is fastened to the base 1, the metal fixing cover 4 is in contact with the upper cover so that the corresponding pins of the capacitors 3a, 3b can be grounded.

As shown in Figures 1 (a) and (b), in this prior art wiper motor housing, a metal ground lug 2 is also provided. The grounding strip 2 functions to be in contact with the corresponding pin of the diode 5 of the control circuit, so that the grounding strip 2 is in contact with the upper cover after the metal cover of the wiper motor housing is fastened to the base 1. , so that the corresponding pins of the diode 5a can be grounded.

For such a prior art wiper motor housing, the fixing and grounding of the capacitor 4 and the grounding of the diode 5 must be realized by different components, such as the fixed cover 3 and the grounding strip 2, respectively. For this reason, the difficulty in manufacturing and assembling the wiper motor housing is increased. How to use fewer components to simultaneously achieve the capacitor fixing of the control circuit and the grounding of the capacitor and the diode becomes an urgent problem to be solved.

An electronic device is disclosed in US 2004/0046465 A1. The unit piece of the piece, such as the above grounding piece, can only be used for welding with the pins of the related electronic device, and cannot perform other fixing functions; at the same time, the unit piece is composed of a plurality of terminals. The pins of different electronic devices are soldered to different terminals, which tends to make electromagnetic compatibility worse. Summary of the invention

An object of the present invention is to provide a motor housing for a vehicle wiper, in which a grounding lug provided in the motor housing can directly realize the fixing of the grounding electronic device in the control circuit of the automobile wiper Grounding, thereby reducing the need for the associated fixed cover, reducing manufacturing costs, and also improving the electromagnetic compatibility of the entire circuit and improving the soldering quality of the grounding pins of the electronic device.

According to an aspect of the invention, a vehicle wiper motor is provided, wherein the motor has a motor housing, the motor housing includes a plastic base and an upper cover made of a conductive material, and the upper cover can be buckled Formed on the base, a control circuit is disposed in the motor housing, the control circuit includes a first electronic device, such as a capacitor and a grounding piece, to be grounded, the grounding piece is made of a metal sheet, and includes a body. For example, a flat body; and a grounding section extending upward from a side of the body, the body being fixed on the base to enable the grounding section to contact the engaged upper cover;

The grounding piece further includes:

a first contact segment extending from a side of the ground segment and spaced apart from the body, the ground pin of the first electronic device being solderable on a surface of the first contact segment .

Preferably, the control circuit further includes a second electronic device, such as a diode, that needs to be grounded, and the ground strip further includes a second contact section extending upward from the other side of the body, the second electronic device The grounding pin can be soldered to the side surface of the second contact section that faces away from the body.

Optionally, the grounding section is perpendicular to the body and the first contact section is parallel to the body.

Optionally, the second contact section is perpendicular to the body.

Preferably, the first electronic device can be soldered to the first connection of the grounding strip in advance On the underside surface of the contact section.

Optionally, the first contact section extends from the ground section via a connecting section, the connecting section having a stress relieving inclined portion.

Optionally, the ground pin of the second electronic device can be soldered to the second contact section of the ground strip in advance.

Optionally, the ground strip further includes a third contact section extending from the other side of the body to contact a ground pin of other electronic devices of the control circuit.

Optionally, the body of the grounding piece has a fixing portion, and the base has a matching fixing portion, and the two can cooperate with each other to make the body firmly mounted on the base.

According to another aspect of the present invention, a vehicle wiper is provided, the wiper comprising the motor described above.

With the above technical solution according to the present invention, the fixing of the electronic device can be realized by only one grounding piece, thereby saving the requirement of using other fixing components in the motor casing of the vehicle wiper, saving manufacturing and installation costs; The diode can be soldered to the outer surface of the second contact section, which can better control the soldering quality and improve the yield; furthermore, the capacitor and/or diode can be soldered to the grounding strip before the grounding strip is placed In the housing, this obviously shortens the assembly time of the vehicle wiper and reduces the assembly cost. DRAWINGS

Figure 1 (a) shows a perspective view of a portion of a prior art wiper motor housing; Figure 1 (b) shows the wiper motor housing as shown in Figure 1 (a) a perspective view of a prior art grounding piece;

Figure 2 shows a schematic circuit diagram of a control circuit of the wiper motor;

Figure 3 (a) is a perspective view showing a portion of a wiper motor housing according to the present invention; Figure 3 (b) is a perspective view showing the grounding piece according to the present invention alone;

Figure 3 (c) shows the capacitor and diode mounted in the wiper housing separately; Figure 4 (a) shows a top view of the base of the wiper motor housing according to the present invention;

Figure 4 (b) shows a perspective view of a portion of a wiper motor housing in accordance with the present invention. detailed description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals.

Fig. 2 shows a schematic circuit diagram of a control circuit of the wiper motor. It should be clear that the invention does not relate to the construction of a particular circuit, so only the usual control circuit examples are selected here. In this circuit, the A, B, and C ports are respectively connected to the connectors that specifically implement the control functions to supply the motor M and control the start and stop of the motor M, wherein the ports A and B are implemented to supply the motor M, and the port C The connected switch K realizes whether the motor starts and stops. Port D is the ground terminal. In this circuit, the capacitors 3a, 3b and the diodes 5a, 5b, 5c constitute a sub-circuit for protecting the motor M, wherein the capacitors 3a, 3b and the diode 5a must be grounded in common.

Figure 3 (a) shows a perspective view of a portion of a wiper motor housing in accordance with the present invention. It should be clear that the wiper generally comprises a motor (not shown). The motor includes a motor housing. The wiper motor housing according to the present invention generally includes a base 1 and an upper cover (not shown). The base 1 is molded from plastic. The upper cover is made of a conductive material such as metal in order to achieve grounding. For the sake of clarity, Figure 4 (a) generally shows a top plan view of the base 1. A flange 1.1 extends substantially perpendicularly from the outer peripheral contour of the base 1 for sealing purposes after the upper cover is snapped. As shown in Figures 3(a) and 4(a), two vertical uprights 1.2 are formed at appropriate locations on the outer circumference of the base 1, for example for passing through corresponding guide holes in the upper cover, so that Guide the upper cover to correct. Further, two snaps 1.3 are formed at appropriate positions on the outer circumference of the base 1 to cooperate with the mating members in the upper cover to snap the upper cover into place.

Referring to Figure 3 (a), the electronics of the circuit shown in Figure 2 are placed in the base 1. For example, two capacitors 3a, 3b and diodes 5a, 5b, 5c are placed in the base 1 (where the diodes 5b, 5c are hidden in Fig. 3(a) but shown in Fig. 3(c)). Specifically, as shown in FIG. 3(c), the capacitors 3a, 3b include ground pins 3a', 3b' and non-ground pins 3"T, 3b, respectively, and the diodes 5a include ground pins 5a' and non-ground pins 5a, respectively.

A support 8 for supporting the capacitors 3a, 3b is provided on the base 1. The holder 8 is made of plastic and can be molded integrally with the base 1 or mounted on the base 1. The holder 8 has, for example, a side wall in contact with a capacitor 3a. The two capacitors 3a, 3b sit side by side on the support 8. Because the current is omitted in the wiper motor housing according to the invention There is a metal fixing cover 4 which is technically (as shown in Fig. 1 (a)), so a plastic sleeve 7 is fitted around the outer periphery of the two capacitors 3a, 3b. The plastic sleeve 7 encloses the side walls of the support 8 and the two capacitors 3a, 3b to secure the capacitance to the support. For example, the inner contour of the plastic sleeve 7 can be matched to the outer circumference of the combination of the two capacitors 3a, 3b and the surface of the corresponding side wall.

Although in the illustrated embodiment, the fixing of the capacitors 3a, 3b is achieved via the plastic sleeve 7. However, it is conceivable that any other conceivable means can be used for the fixed capacitors 3a, 3b. For example, in the case of omitting the plastic sleeve 7, the holder is directly formed with a sleeve that cooperates with the capacitors 3a, 3b to fix it or The claws of the fixed capacitors 3a and 3b are formed on the seat.

A grounding lug 6 constructed in accordance with the present invention is disposed within the base 1. The grounding piece 6 is, for example, stamped from a metal sheet. Figure 3 (b) specifically shows the shape of the grounding lug 6 according to the present invention. As shown in Fig. 3(a), when the grounding lug 6 is placed in position on the base 1, the grounding pins 3a', 3b' of the capacitors 3a, 3b project from the side of the holder 8 adjacent to the ground lug 6.

The ground lug 6 includes a substantially flat body 6.1. In order to be placed in the base 1 in a manner that occupies the smallest space, the body 6.1 may have any suitable shape. For example, as shown in Fig. 3(b), the body 6.1 is approximately triangular in shape. A notch 6.9 is formed at a suitable position on the body 6.1, and a stop portion 6.10 extends obliquely upward from one side of the notch 6.9. A projection 10 is formed on the surface of the base 1 which is in contact with the body 6.1. When the body 6.1 of the grounding lug 6 is placed on the base 1, the projection 10 passes through the notch 6.9 as shown in Fig. 3(a) and is abutted by the stopper 6.10, preventing the grounding lug 6 from being detached from the base 1.

A grounding section 6.2 extends vertically upward from a side of the substantially flat body 6.1. It should be noted that in the present document, up or down refers to an upward or downward pointing with respect to the base 1. As shown in Fig. 3(b), the grounding section 6.2 extends a section of the elbow 6.6 after extending a length. The extension of the grounding section 6.2 is such that when the body 6.1 of the ground lug 6 is placed on the base 1, the elbow section 6.6 is just able to straddle the upright 9 extending vertically upwards on the base 1 (Fig. 3 ( a) shown). When the ground lug 6 is placed in position on the base 1, the elbow section 6.6 can span the post 9 to contact the upper cover that is subsequently snapped onto the base 1. The upper cover is made of, for example, metal, so that the grounding piece 6 can achieve the grounding function.

It should be pointed out that the upper cover of the wiper motor housing is not within the scope of the invention. The shape is limited. That is, as long as the upper cover that is engaged with the base 1 can be in contact with the elbow section 6.6 of the grounding lug 6 as shown in Figs. 3(a) and (b), any shape of the upper cover can be employed.

In this embodiment, the elbow section 6.6 takes the shape of a circular arc so that the contact pressure can be minimized when it comes into contact with the upper cover (not shown). However, it should be understood that the elbow section 6.6 is not limited to the circular arc shape as shown in Fig. 3(b). For example, the elbow section 6.6 can also be formed into any other suitable shape, such as a square or a triangle, as long as the ground strip 6 can be placed in contact with the upper cover after being placed in position. Alternatively, the elbow section 6.6 can even be eliminated, in which case the extension of the grounding section 6.2 is set such that when the upper cover is snapped onto the base 1, the free end of the grounding section 6.2 can be attached to the upper cover contact.

As shown in Fig. 3(b), a section 6.3 extends laterally from one side of the grounding section 6.2, for example parallel to the body 6.1. For example, the section 6.3 extends substantially at right angles to the ground section 6.2. It can be seen from Fig. 3(b) that the plane in which section 6.3 is located is slightly at an angle to the plane in which grounding section 6.2 is located.

A contact section 6.5 extends transversely from the end of section 6.3 opposite the ground section 6.2, for example parallel to the body 6.1. The contact section 6.5 is connected to the section 6.3, for example via a slanted connecting section 6.4. The inclined connecting section 6.4, for example, ensures that the contact section 6.5 can have a sufficient degree of deformability when the grounding strip 6 is mounted, thereby preventing the contact section 6.5 from being broken due to excessive deformation when in contact with other objects.

The height between the section 6.3 and the body 6.1, more specifically the height between the contact section 6.5 and the body 6.1, is such that after the ground lug 6 is placed in position on the base 1, a contact surface of the contact section 6.5 is provided. The ground pins 3a', 3b' of the capacitors 3a, 3b placed in position on the base 1 can be brought into contact as shown in Fig. 3(a). For example, as shown in Fig. 3(a), when the ground strip 6 is placed in position, the surface of the contact section 6.5 facing the base 1 contacts the ground pins 3a', 3b' of the capacitors 3a, 3b. It is conceivable that the ground pins 3a', 3b' of the capacitors 3a, 3b can also be placed in contact with the surface of the contact section 6.5 opposite the base 1 if necessary.

It is conceivable that the respective pins of the capacitors 3a, 3b can be soldered to the respective surfaces of the contact section 6.5 before the grounding lug 6 is placed on the base 1, so that after the grounding lug 6 is placed on the base 1, the capacitor 3a, 3b can be solidified via the grounding strip 6 that has been fixed Set. Then, the non-grounding pins 3a, 3b" of the capacitors 3a, 3b are connected to other related electronic devices. Thus, although the wiper motor housing according to the present invention does not employ the prior art metal fixing cover 4 (As shown in Figure 1 (a)), but the capacitors 3a, 3b can also be fixed well and reliably; at the same time, due to the omission of the metal fixing cover, the weight of the wiper motor housing is correspondingly reduced, and due to the capacitance The ground pins of 3a, 3b are soldered directly to the ground strip 6, thus also improving the electromagnetic compatibility of the circuit of the entire wiper.

As shown in Fig. 3(b), another contact section 6.8 extends upwardly from the other side of the body 6.1 substantially perpendicularly to the body 6.1. The extension of the contact section 6.8 is less than the extension of the ground section 6.2. As can be seen from Fig. 3(a), after the grounding lug 6 according to the present invention is placed in position on the base 1, the grounding pin 5a' of the diode 5a is in contact with the contact section 6.8. In this embodiment, the outer surface 5a of the ground pin diode 5 _a 'contact with the contact section 6.8. In the present application, the outside or inside of the contact section is for the body 6.1 of the ground lug. For example, the outer side surface of the contact section 6.8 refers to the side surface of the contact section 6.8 that faces away from the body 6.1.

The ground pin 5a' of the diode 5a can be soldered to the inner side surface of the contact section 6.8. It is contemplated, as described above, the diode 5 can be a capacitor 3a, 3b as the grounding pin 5 _a 'pre-welded on the outer surface of the contact section 6.8, and then with the ground plate 6 is placed in position on the base 1 And fixed.

It is conceivable that the grounding pin 5^ of the diode 5a can also be soldered to the inner side surface of the contact section 6.8 facing the body 6.1 as needed.

The two diodes 5b, 5c hidden in FIG. 3(a) are shown in FIG. 3(c). The two diodes 5b, 5c include first pins 5b', 5c' and second pins 5b, respectively. 5c- o Three conductive sheets 11, 12, 13 are respectively mounted in the base 1. The first pin 5b' of the diode 5b, the first pin 5c' of the diode 5c, and the non-ground pin 5a of the diode 5a are simultaneously The conductive sheet 13 is in contact with and can be soldered thereon. The non-grounding pin 3£T of the capacitor 3a and the second pin 5b of the diode 5b are simultaneously in contact with the conductive sheet 12 and can be soldered thereon. The non-grounding pin of the capacitor 3b 3b" is in contact with the second lead 5c of the diode 5c at the same time as the conductive sheet 11 and can be soldered thereto.

In the embodiment shown in Fig. 3(b), substantially opposite the grounding section 6.2, another contact section 6.7 extends perpendicularly from the body 6.1. The contact section 6.7 can for example Used to contact other required electronic devices.

Fig. 4(a) shows a top view of the base 1 to which the grounding lug 6 according to the present invention has been mounted, in which the capacitor 3 is not covered with a plastic sleeve 7 as shown in Fig. 3(a). Figure 4 (b) shows a partial perspective view of the base 1 as shown in Figure 4 (a). As can be seen from these figures, the non-grounded pin of capacitor 3 is on the opposite side of its ground pin.

It should be clear that the shape of the grounding lug 6 as shown in Figures 3(a) through 4(b) is shown for illustrative purposes only. In the illustrated embodiment of the invention, the shape taken by the ground lug 6 can optimally save space occupied within the base 1. It should be clear to those skilled in the art that for a wiper motor housing having other circuit layouts or other shapes of the wiper motor housing, the shape of the grounding lug 6 can be appropriately deformed as long as one of the grounding lugs 6 or A plurality of corresponding contact segments can simultaneously contact the capacitance in the circuit and the ground pin of the diode.

For example, in the illustrated embodiment, the ground strip 6 is connected to the ground pins of the capacitors 3a, 3b and diode 5a via two contact sections 6.5 and 6.8, respectively; however, it is contemplated that the ground strip 6 may only pass through a suitable shape. The contact section is connected to the capacitors 3a, 3b and the ground pin of the diode 5a at the same time. Such a suitably shaped contact section may be arbitrarily arranged in accordance with the layout requirements of the grounding lug 6 in the base 1, for example, may extend from the side of the section 6.3 opposite the connecting section 6.4 as shown in Figure 3 (b) One of the contact sections.

In the particular embodiment shown, the body 6.1 of the ground lug 6 is of a flat shape, but it is contemplated that the body 6.1 can assume a non-flat shape as long as it ensures that the body 6.1 can be securely attached to the base 1. For example, the ground lug 6 can include a corrugated body 6.1 while the body 6.1 can ensure that at least three points are soldered to the base 1. Thus, the corrugated body can also be firmly fixed to the base 1. Any other suitable shaped body 6.1 that can be conceived by those skilled in the art can be employed in the ground strip 6 in accordance with the present invention.

With the wiper having the grounding piece according to the present invention, the manufacturing cost can be reduced because the prior art metal fixing cover is omitted and the grounding of electronic components such as capacitors and diodes in the circuit can be realized by using only one grounding piece. In addition, since the metal fixing cover of the prior art is omitted, it is no longer necessary to provide a corresponding fixing structure for fixing the metal fixing cover in the wiper motor housing, which also simplifies the base of the wiper motor housing. The structure provides more possibilities for the installation of other devices. In addition, since the prior art is omitted The metal fixing cover reduces the weight of the wiper and saves the internal assembly space of the wiper motor housing. This can, for example, provide more space for the placement of other suitable sealing structures. In addition, the direct connection of the capacitor to the ground lug can further improve the electromagnetic compatibility of the wiper motor.

Further, although in the above specific description of the embodiment, a diode or a capacitor is taken as an example for explanation, it is conceivable that if there are other electronic devices such as transistors which need to be grounded in the control circuit, grounding can be performed by a similar means.

Although the specific embodiments of the present application have been described in detail herein, they are provided for the purpose of understanding and are not to be construed as limiting the scope of the application. Various alternatives, modifications, and adaptations are conceivable without departing from the spirit and scope of the application.

Claims

Rights request

1 . A vehicle wiper motor, wherein the motor comprises a motor housing, the motor housing comprises a plastic base and an upper cover made of a conductive material, and the upper cover can be fastened to the base, a control circuit is disposed in the motor housing, the control circuit includes a first electronic device that needs to be grounded, and a grounding piece, the grounding piece is made of a metal sheet, and includes a body; and extends upward from a side of the body The grounding section, the body is fixed on the base, so that the grounding section can be in contact with the buckled upper cover;

The grounding piece further includes:

2. The electric machine according to claim 1, wherein the control circuit further comprises a second electronic device that needs to be grounded, and the grounding piece further comprises a second contact extending upward from the other side of the body. The segment, the ground pin of the second electronic device can be soldered on a side surface of the second contact segment that faces away from the body.

The electric machine according to claim 1 or 2, wherein the grounding section is perpendicular to the body, and the first contact section is parallel to the body.

4. A machine as claimed in claim 1 or 2, wherein the second contact section is perpendicular to the body.

5. The electric machine according to claim 3, wherein the first electronic device can be soldered in advance on a lower side surface of the first contact section of the grounding piece.

The electric machine according to claim 1 or 2, wherein the first contact section extends from the ground section via a connecting section, the connecting section having a stress relieving inclined portion.

7. The electric machine according to claim 2, wherein the grounding pin of the second electronic device can be soldered to the second contact section of the grounding piece in advance.

The electric machine according to claim 1 or 2, wherein the grounding piece further comprises a third contact section extending from the other side of the body to ground the other electronic device of the control circuit Foot contact.

The motor according to claim 1 or 2, wherein the body of the grounding piece has a fixing portion, and the base has a matching fixing portion, and the two can cooperate with each other to securely mount the body in the body On the base.

10. The machine of claim 1 wherein the first electronic device is a capacitor.

11. The machine of claim 10, wherein the second electronic device is a diode.

12. A vehicle wiper, characterized in that the vehicle wiper comprises a motor according to any of the preceding claims.