WO2009146997A1 - Motor and gear unit, in particular wiper motor - Google Patents

Abstract

A motor and gear unit has an electric driving motor (17) and a gear (14), in a housing (2). The housing (2) is composed of two housing shells (3, 4), wherein a regulating or control unit (9) designed as a separate component is arranged on the outer side of the housing (2).

Description

Description

title

Motor-gear unit, in particular wiper motor

The invention relates to a motor-gear unit, in particular a wiper motor for wiper devices in vehicles, according to the preamble of claim 1.

State of the art

In DE 102 59 154 Al a windshield wiper device for a motor vehicle is described, which is driven by a wiper motor having as drive unit an electric motor whose armature is connected via a transmission with a drive shaft for driving the windscreen wiper. The electric motor and the transmission together form the wiper motor and are arranged in a common housing.

The electric motor is controlled by signals of a control or control unit in response to current external conditions or control commands. About the signals of the control or control unit, the energization of the electric motor is set in the desired manner.

Disclosure of the invention

The invention has for its object to provide a compact motor-gear unit, which can be adapted with little effort to different purposes. This object is achieved with the features of claim 1. The dependent claims indicate expedient developments.

The motor-gear unit according to the invention, which is in particular a wiper motor for wiping devices in vehicles, has a housing composed of two housing shells, wherein the control unit is designed as a separate component, which on the outside of the housing to attach. The control unit may optionally have a plug connection. This design opens the possibility to adapt the motor-gear unit with little effort to different requirements.

Depending on the version, different control or control units with different customer plugs can be mounted on the outside of the housing. For example, in a first variant, two brushes may be provided as the standard electric motor, or a donor magnet and three brushes may be provided as a mechatronic electric motor in a second variant. Furthermore, it is possible to provide in the housing interior adapted to the particular application electric drive motors and / or gear units, the dimensions of the housing shells can be maintained. By appropriate adaptation measures different sized components can be accommodated inside the housing. Overall, this improves the use of identical parts and simplifies assembly and disassembly into different vehicle types. The housing here represents a universal shell or a package of uniform size and design, which serves to accommodate different sizes of armature, magnets and yoke rings of the electric drive motor and the components of the transmission.

Another advantage is that the mechanical part of the engine-transmission unit is completely inside the housing and the Electronic part is located completely outside of the housing, making it possible for the housing interior a lower protection class (eg. IP44) can achieve than for the electronics (IP6k7k).

The two housing parts are expediently mirror-symmetrical to each other, so that the control or control unit can be positioned in a mirror-symmetrical arrangement on one of the two housing shells. Pre-stamped insertion openings for the electrical contact between the control unit and electrical conductors in the interior of the housing, which lead to the electric drive motor, can be introduced into the shells. Depending on the installation position and engine variant, the pre-embossed openings are opened. About the electrical contact, the power supply of the drive motor. The electrical contact is designed in particular as brushes, which bear against a circulating with the armature commutator inside the housing.

Furthermore, a recess for a drive shaft, which is driven by the transmission and over which, for example, the wiper linkage is actuated, can be introduced into each housing shell. The recess is advantageously in a dome, which rises above the top of the respective housing shell and at the same time causes a centering of aufzusetzenden control or control unit.

In order to ensure that the dome or the recesses are coaxial with each other after assembling the two housing shells, different measures for coaxial alignment can be made after the assembly of the housing shells. As part of a tolerance compensation this angle deviations and shifts between the housing shells can be compensated in two directions, which is achieved for example via the insertion of a two-part socket, which is guided through both recesses or the two domes in different housing shells. - A -

To facilitate the placement of the control or control unit on a housing shell and for better connection with the housing shell, it may be advantageous to form on the outside of the housing shell a projecting boundary edge, which limits the control unit and encloses.

Together with the protruding dome, which protrudes into a correspondingly shaped recess in the control unit or control unit, a secure mounting and fixing on the housing shell is achieved. In addition, the control unit can be connected via other form-fitting, frictional or cohesive connection measures with the housing.

The housing shells are expediently made of sheet steel and are produced in particular by thermoforming. In principle, an embodiment of the housing shells made of a magnetic or magnetizable material, in order to support the magnetic inference in the electric drive motor, so that optionally can be dispensed with a separate return ring of the drive motor. The execution of the housing shells made of metal also allows the

Impressions of depressions, for example, in order to adjust the geometry of the housing shells so that components inside the housing and possibly also on the outside of the housing are supported in an improved manner.

Furthermore, it is expedient to carry out that housing section which accommodates the gear unit with a smaller thickness than the housing section which receives the drive motor. It is particularly expedient that the gearbox housing section including the control unit has a total thickness which is not greater than the total thickness of the drive motor housing section.

Further advantages and expedient embodiments can be taken from the further claims, the description of the figures and the drawings. Show it: 1 is a side view of a motor-gear unit, comprising a housing consisting of two housing shells, in which an electric drive motor and a gear unit is received to drive a drive shaft,

2 shows the engine-transmission unit in perspective view,

3 shows the motor-gear unit in a side view with a mounted on a housing shell control unit,

4 shows the engine-transmission unit including control unit in perspective view,

5 shows the engine-transmission unit with control unit in plan view,

6 shows a housing upper shell in plan view without control or control unit, with closed, pre-embossed recesses,

Fig. 7 shows a housing lower shell in plan view without control or control unit, with open, pre-embossed

recesses,

Fig. 8, the housing shell of FIG. 7 with attached Regelbzw. Control unit

9 is a perspective view of the housing without patch control unit, wherein in the outer side of the upper housing shell a depression is impressed, which serves for ball bearing clearance adjustment, 10 shows the motor-gear unit of FIG. 9 in a partially cutaway state, FIG.

11 is a plan view of the motor-gear unit with remote upper housing shell,

12 is a section through the motor-gear unit,

Fig. 13 is a perspective view of an engine-transmission unit in an alternative embodiment, in which the

Control unit is integrated into the housing interior,

14 shows a further motor / gearbox unit with regulating or control unit integrated into the housing, the housing part accommodating the electric drive motor being designed as a separate pole pot.

In the figures, the same components are provided with the same reference numerals.

As can be seen from FIGS. 1 and 2, the motor / gearbox unit 1, which is, for example, a wiper motor for a wiper device in a motor vehicle, has a housing 2 which has an electric drive motor in a housing section 2 a in a subsequent further housing section 2b receives a transmission. The housing 2 is designed in two parts and comprises two housing shells 3 and 4, which are mirror-symmetrical to each other. The housing shells are preferably produced by deep drawing and consist of metal, in particular of a magnetizable or magetized metal, preferably of sheet steel. In the area of the essentially cylindrical motor section 2a of the housing, cooling fins 6 are impressed into the housing shells 3 and 4, which are intended to effect improved cooling of the electric drive motor. The elongated cooling fins 6 are uniform over the circumference of the housing portion 2a distributed and extend in the axial direction. The cooling fins are formed as radially outwardly embossed ribs. At the Dom 7 is mounted on the top of a pressure compensation membrane 21, which allows the control unit and a higher protection class

(For example, according to DIN 40050) than the mechanical part of the engine.

The gear housing portion 2b is approximately disc-shaped and has an axis which crosses the axis of the motor housing portion 2a. The gear housing portion 2b has a significantly smaller thickness, measured in the axial direction of the gear housing portion, than the diameter of the approximately cylindrical motor housing portion 2a. In each housing shell 3 and 4, a central Dom 7 is introduced in the region of the gear housing section 2b, which is integrally formed with the respective housing shell and rises above the outside of the respective housing shell. Dom 7 limits a recess or a passage 8, the or for receiving and adjustable storage of arrival or

Output shaft 5 is used, which is driven by the transmission inside the housing. The Dom 7 is cylindrical or possibly conical. The pressure compensation membrane 21 covers the recess 8 in the dome 7 in the event that the drive shaft 5 is guided through the dome in the opposite housing shell.

3 and 4, a control or control unit 9 is placed on the upper housing shell 3 of the housing 2, in the region of the gear housing section 2b. The upper side of the gearbox housing section 2b is essentially covered by the control unit 9. The thickness of the control or control unit 9 and the total thickness of the gear housing portion 2b are dimensioned so that the outer diameter of the substantially cylindrical motor housing portion 2a is not surmounted. 5 and 6, the upper housing shell 3 is shown in plan view, wherein Fig. 5 shows the housing shell with control unit and Fig. 6, the housing shell without the control unit. FIGS. 7 and 8 correspond to FIGS. 5 to 6, but show the lower housing shell 4.

The gear housing portion 2b is bordered by a boundary edge 12 which rises above the outside of the respective housing shell 3 or 4 and in the mounted state, the control unit 9 circumferentially limited. Of the

Boundary edge 12 extends over the circumference of the gearbox housing portion 2b to the adjacent motor housing section 2a.

6 and 7 it can be seen that in the housing shells 3 and 4 indentations 10 are introduced into the wall, which can be broken with little effort and brush recesses 11 form, which are provided for the brush holder, via which the electrical contact is made to the drive motor in the housing. The impressions 10 are located in the brush carrier region of the housing shells 3 and 4. In mechatronic control units two brush recesses 11 and three standard brushes recesses 11 are opened.

9 and 10 show an introduced into the housing shell 3 indentation 13, for example, has the function of an additional support of a housed inside the housing component. The indentation can be introduced after the deep-drawing process for the production of the housing parts.

Fig. 10 also shows the gear 14 in the gear housing portion 2b, which comprises a rotating with the armature of the drive motor armature shaft 15 which meshes with a gear 16 which is rotatably connected to the drive shaft 5 through which the drive movement on the mechanical wiper parts is transmitted. The input or output shaft 5 is guided in a two-part adjustable bearing bush 20.

11 and 12, the engine-transmission unit 1 is shown with removed housing shell or in section. Evident is the electric drive motor 17 whose armature drives the armature shaft 15, which meshes with the gear 16 as part of the transmission 14. The free end face of the armature shaft 15 is in close proximity to the inner wall of the housing shell; The armature shaft may optionally be supported in this area, for example via an additional bearing.

The drive motor 17 is encompassed by a return ring 18, which serves for the improved guidance and direction of magnetic field lines.

In Fig. 13, a further embodiment is shown, in which the two housing shells 3 and 4 of the housing 2 are not mirror-symmetrical, but different.

The upper housing shell 3 is for receiving the rule or

Control unit formed in the interior of the housing and accordingly has in the region of the gearbox housing portion 2b a greater thickness. The control unit is completely integrated into the housing interior.

In the embodiment of FIG. 14, the control unit is also integrated into the housing interior. In addition, the motor housing portion 2a is divided into two in the axial direction, wherein the transmission housing portion 2b adjacent part of the two housing shells 3 and 4 is formed, whereas the frontal portion is formed by a designed as a separate component pole housing 19, the electrical Drive motor receives.

Claims

claims 1. engine-transmission unit, in particular wiper motor for wiper devices in vehicles, with an electric drive motor (17) and a transmission (14) in a common housing (2), and with a control or control unit (9) for controlling or Control of the drive motor (17), characterized in that the housing (2) is composed of two housing shells (3, 4) and that the control unit or control unit (9) designed as a separate component acts on the outside of the housing (2). is arranged. 2. Motor-gear unit according to claim 1, characterized in that the control or control unit (9) in the region of the transmission (14) on one of the housing shells (3, 4) can be placed. 3. Motor-gear unit according to claim 1 or 2, characterized in that the total thickness of regulating or control unit (9) and the control or control unit (9) receiving housing portion (2b) is not greater than the total thickness of the housing portion (2a) in the region of the drive motor (17). 4. Motor-gear unit according to one of claims 1 to 3, characterized in that in the housing (2) recesses or insertion openings (10) are impressed, which are at least partially open for electrical contact between the control or Control unit (9) and electrical conductors inside the housing (2). 5. Motor-gear unit according to one of claims 1 to 4, characterized in that in at least one housing shell (3, 4) over the top elevating Dom (7) with a Recess (8) for one of the transmission (14) to be driven drive shaft (5) is introduced. 6. Motor-gear unit according to claim 5, characterized in that on the output shaft (5) or on the gear (16) at least one encoder magnet is fixed and that the control unit or control unit (9) receives a sensor signals of the encoder magnet sensor having. 7. Motor-gear unit according to one of claims 1 to 6, characterized in that at least one housing shell (3, 4) has a protruding boundary edge (12) for enclosing the control or control unit (9). 8. Motor-gear unit according to one of claims 1 to 7, characterized in that the two housing shells (3, 4) are formed at least approximately mirror-symmetrical to each other. 9. Motor-gear unit according to one of claims 1 to 8, characterized in that at least one housing shell (3, 4) in the region of the drive motor (17) cooling ribs (6). 10. Motor-gear unit according to one of claims 1 to 9, characterized in that the housing shells (3, 4) Consist of sheet steel. 11. Motor-gear unit according to one of claims 1 to 10, characterized in that the housing shells (3, 4) are made as deep-drawn components. 12. Motor-gear unit according to one of claims 1 to 11, characterized in that in at least one housing shell (3, 4) a component deformation (13) produced by embossing is introduced. 13. Motor-gear unit according to one of claims 1 to 12, characterized in that the mechanical region of the motor is separated by a membrane (21) on a bearing bush (20) of the control unit or control unit (9).