CN217741510U - Motor assembly with improved position determination - Google Patents

Abstract

The present application proposes a motor assembly having an improved position determination function, which includes a motor as a power driving source, a transmission having an output shaft, a position line for the motor, and a corresponding position line connection structure, wherein one end of the position line is electrically connected to the position line connection structure, the output shaft is made of a conductive material and is adapted to be given a predetermined potential, the position line connection structure includes a conductive position line slip piece disposed adjacent to the output shaft, and a conductive bump protruding outward from an outer peripheral surface of the output shaft, one end of the position line is electrically connected to one end of the conductive position line slip piece, the conductive bump has a circular arc-shaped circumferential surface, and is configured such that the other end of the conductive position line slip piece periodically comes into sliding contact with the circular arc-shaped circumferential surface of the conductive bump as the output shaft rotates. Compared with the prior art, the electrostatic precipitator has the advantages of effectively solving the problem of electrostatic accumulation, being simple in structure, low in production cost and the like.

Description

Motor assembly with improved position determination

Technical Field

The present application relates to a motor assembly, and more particularly, to a motor assembly, such as a wiper motor assembly, having an improved position determination function.

Background

Motors having a position determination function such as a parking (i.e., stopping a driven load at a predetermined position) function are known in the art and have wide application in vehicles, power machines, processing equipment, and the like.

For example, as a power source commonly used for a wiper, a wiper motor is often used in a motor vehicle such as an automobile, in which a rotational motion of the wiper motor is converted into a reciprocating motion of a wiper arm by a link mechanism or the like under a driving action of the wiper motor, thereby achieving a desired wiping action, and having a predetermined parking function.

The above-described conventional mechanical wiper motor is basically based on the following parking principle: when the driver performs an action of turning off the wiper, a control device such as a vehicle Body Control Module (BCM) will first detect the current position of the wiper arm. Only when the wiper arm is detected to return to the predetermined stop position in real time, the control device switches off the relevant relay, thereby cutting off the power supply to the wiper motor, thereby ensuring that the wiper arm can always stay at the predetermined stop position.

In the currently known conventional art, the current position of the wiper (more specifically, the wiper arm) is basically monitored by detecting the level of the parking signal of the wiper motor (in particular, the level of the parking signal of the wiper motor is pulled down). Briefly, for example, when the wiper arm returns to the rest position, the park wire of the wiper motor will be correspondingly grounded, outputting a correspondingly low level to the vehicle body control module, thereby making the vehicle body control module know the current position of the wiper arm, i.e., its rest position.

According to one known conventional design, the grounding function of the above-mentioned stop line is mainly achieved by means of a metal disk arranged on one end face of a transmission gear, for example made of plastic, which is provided with the wiper motor, and a stop line slider (also referred to as a scribe) and a ground line slider which are arranged in correspondence with the metal disk and are electrically conductive, wherein the stop line slider and the ground line slider are configured such that the stop line is connected to the ground line once (i.e., grounded once) per one rotation of the transmission gear by the short-circuit connection action of the metal disk, thereby achieving the required level reduction of the stop signal.

The structure and the manufacturing process of the conventional structural design are complex, the production cost is high, and meanwhile, static electricity is easy to generate and accumulate on the metal disc due to the friction between each sliding sheet and the transmission gear and the friction between the transmission shaft of the wiper motor and the transmission gear. When the next stop position line sliding sheet contacts with the metal disk, the static electricity will be discharged. The static discharge may cause problems such as an excessive spatial radiation of electromagnetic compatibility (EMC) and an excessive conducted disturbance, and the static discharge may also be discharged to the body control module along the parking line, thereby increasing a risk of the body control module failing. In addition, with the development of information technology and the increasing electronization degree of electronic equipment such as automobiles, the EMC performance requirements on electronic components are also increasing, and automobile manufacturers raise the specifications of EMC enterprises year by year and continuously update product technologies to improve the required EMC performance.

Accordingly, there is a need for further improvements to the above-identified known conventional structural designs to at least reduce, if not eliminate, the problems or deficiencies presented therein.

SUMMERY OF THE UTILITY MODEL

In view of the above background, it is an object of the present application to propose a motor assembly with an improved position determination function, which is able to overcome or eliminate at least partially the drawbacks or drawbacks of the prior art.

To this end, according to one aspect of the present application, there is provided a motor assembly having a position determining function, including:

a motor as a power drive source, the motor including a motor housing, a stator and a rotor accommodated in the motor housing, and a rotating shaft for outputting a drive torque generated by the motor;

the transmission device is in transmission connection with the rotating shaft and comprises an output shaft for power output, and the transmission device can transmit the rotating motion generated by the rotating shaft to the output shaft at a certain transmission ratio and output power to a given load through the output shaft;

a position line for the electric machine and a corresponding position line connection, wherein one end of the position line is electrically connected to the position line connection and the other end of the position line is connected to a control device, via which position line connection the position line can be periodically brought to a potential during operation of the electric machine in order to precisely detect the current position of the load and thus to be able to carry out a predetermined operation under the control of the control device (for example for corresponding indication or control purposes),

wherein the output shaft is made of a conductive material and adapted to be given a predetermined electric potential, the position line connection structure includes a conductive position line slip piece disposed adjacent to the output shaft and a conductive bump protruding outward from an outer peripheral surface of the output shaft, the one end of the position line is electrically connected to one end of the conductive position line slip piece, the conductive bump has a circular arc-shaped circumferential surface and is configured such that the other end of the conductive position line slip piece periodically comes into sliding contact with the circular arc-shaped circumferential surface of the conductive bump as the output shaft rotates.

According to a feasible embodiment, the motor is a direct current wiper motor, the position line is a stop line, the output shaft is connected to the ground (the position line connection structure constitutes a stop line grounding structure), and during the operation of the motor, the stop line can be periodically connected to the ground through the conductive position line sliding piece and the conductive bump to accurately obtain the current position of the load, and therefore, the power supply of the motor can be timely cut off when the load needs to stop operation under the control of the control device, so as to stop the load at a predetermined position.

According to a possible embodiment, the conductive bump is formed integrally with the output shaft. In other words, the conductive bump and the output shaft are formed as a one-piece, unitary member.

According to a possible embodiment, the conductive bump is a cylindrical section projecting radially outwards from the outer peripheral surface of the output shaft.

According to one possible embodiment, the cylinder section has a sector-shaped cross section.

According to a possible embodiment, the conductive position line slide is made of an elongated metal sheet having elasticity, and has a fixed end and a free end opposite to the fixed end, the fixed end being electrically connected to the one end of the position line, and the conductive position line slide is configured such that one flat surface of the free end can be brought into sliding contact with the circular arc-shaped circumferential surface of the conductive bump in an elastically abutting manner during rotation of the output shaft.

According to a feasible embodiment, the output shaft has a first end portion for connection to a load to be driven and a second end portion opposite to the first end portion, the conductive bump is provided at the second end portion of the output shaft, the transmission device includes a transmission gear made of a non-conductive material and a hollow cylindrical cap portion formed integrally with the transmission gear and protruding from one end surface of the transmission gear, a window portion is provided on an outer peripheral surface of the hollow cylindrical cap portion, the transmission gear is provided with a central opening through which the output shaft passes and a groove extending radially outward from the central opening and complementary to the conductive bump in shape to each other, the conductive bump and the groove are fitted to each other so that the transmission gear and the output shaft are connected together in a relatively non-rotatable manner and are rotatable together, the second end portion of the output shaft provided with the conductive bump partially enters the hollow cylindrical cap portion after passing through the end surface of the transmission gear via the central opening and the groove, and a part of the conductive bump can be exposed through the window portion and has an arc-shaped surface portion exposed from the window portion.

According to a possible embodiment, said arc-shaped surface portion is circumferentially flush with the circumferential surface of the hollow cylindrical cap on both sides of the window. In other words, the arc-shaped surface portion has the same radius as the outer circumferential surface of the hollow cylindrical cap portion.

According to a possible embodiment, the transmission gear is a worm gear, and the transmission device further comprises a worm fixedly connected to or integrally formed with the shaft and meshing with the worm gear.

According to a possible embodiment, the output shaft is made of a metal or alloy material and the transmission gear is made of a plastic or resin material.

The present application can realize a desired position line connection function (e.g., a station line grounding function) in a simple and convenient manner by employing an output shaft made of a conductive material and capable of being directly given a predetermined potential (e.g., connectable to a voltage source to give a low or zero potential, or directly making a ground connection), and employing a position line connection structure (e.g., a station line grounding structure) mainly including a conductive position line slip piece (e.g., a conductive station line slip piece) disposed adjacent to the output shaft and a conductive bump protruding outward from an outer peripheral surface of the output shaft, so that one end of the conductive position line slip piece can periodically make a sliding contact with a circular arc-shaped circumferential surface of the conductive bump with rotation of the output shaft. Compared with the prior art, the device has the advantages of simple structure, low production cost, capability of remarkably simplifying the manufacturing process and the like. In addition, when the output shaft made of a conductive material is directly ground-connected, for example, the present application can easily and reliably overcome the problems of accumulation of static electricity and EMC caused by static electricity discharge, which are the problems in the prior art, which are generally present in the metal disk pieces provided on the end faces of the transmission gears.

Drawings

The features, advantages, and other aspects of the present application will become more apparent from the following more detailed description of the present application, when taken in conjunction with the accompanying drawings of which exemplary embodiments are set forth, in which:

fig. 1 is a schematic view illustrating a typical configuration of a conventional motor assembly having a position determining function by way of example of a wiper motor;

FIG. 2 is a schematic diagram of the operation of a prior art bitline grounding structure that may be used in the motor assembly shown in FIG. 1, shown in plan view;

FIG. 3 is an assembled state bottom side perspective view of a transmission portion in a motor assembly with position determining functionality according to an exemplary embodiment of the present application;

FIG. 4 is an assembled top side perspective view of a transmission portion of a motor assembly having position determining functionality according to an exemplary embodiment of the present application;

FIG. 5 is an exploded state schematic diagram of a transmission portion in a motor assembly having position determination functionality according to an exemplary embodiment of the present application;

FIG. 6 is another exploded state schematic diagram of a transmission portion in a motor assembly having position determination functionality according to an exemplary embodiment of the present application;

FIG. 7 is a further exploded state schematic diagram of a transmission portion in a motor assembly having position determining functionality according to an exemplary embodiment of the present application;

fig. 8 is an operational principle diagram of a position line connection structure in a motor assembly having a position determination function according to an exemplary embodiment of the present application;

fig. 9 illustrates in top view the working principle of a position line connection structure in a motor assembly with position determination function according to an exemplary embodiment of the present application;

fig. 10 is a schematic view illustrating an operation state of a position line connection structure in a motor assembly having a position determination function according to an exemplary embodiment of the present application.

Detailed Description

Further details of specific embodiments of the present application and the like are described in detail below with reference to the accompanying drawings. It should be understood that the embodiments and their associated descriptions presented herein are to be considered exemplary and not limiting of the present application.

In addition, it is to be noted that the same or similar reference numerals in different drawings denote components that are substantially the same or similar in structure or function, in order to avoid repetitive description as much as possible. It should be understood that the dimensions, positions, etc. of the various elements in the drawings are not drawn to scale strictly and that the dimensions, proportions, etc. of the various elements are not intended to limit the present application.

Further, it should be noted that, for the sake of brevity and for the purpose of facilitating understanding of the main improvements or points of the present application, the description of the present application and the drawings thereof are to focus on or show matters related to the improvements or improvements of the present application, and the structures and related descriptions of other parts are omitted or simplified. Details of the structural design, the operation principle, the selection of materials, and the like of these omitted parts are not described herein nor illustrated in detail since they belong to the known technologies in the art and can be appropriately selected by those skilled in the art according to the existing knowledge and specific applications in the art.

Also, for convenience, in the following description of the present application, a technical background of the present application, technical solutions, design points or main improvements, specific embodiments, and advantages of the present application, etc., will be explained or illustrated in detail by taking a wiper motor (particularly, for example, a direct current wiper motor) assembly used in a wiper as an example, but the present application is obviously not limited thereto.

First, as is well known, a conventional mechanical wiper motor applicable to the present application, as shown in fig. 1, generally includes a motor housing 1, a stator fixedly provided on the motor housing, and a rotor rotatably accommodated in the motor housing about its rotational axis with respect to the stator, the rotor having a rotating shaft extending along its rotational axis. The wiper motor is also generally complexly provided with a transmission gear 2, the transmission gear 2 is provided in a gear housing 3 provided integrally with or separately from the motor housing 1, and complexly provided with a gear cover 5 openable and closable from the top of the transmission gear 2. The transmission gear 2 is typically a worm gear, for example, and in this case a worm 4 is also correspondingly provided in the motor housing 1, the worm 4 being fixedly connected to the shaft or being integrally formed. The worm 4 and the worm wheel are engaged with each other to transmit a rotational motion generated by the rotation shaft to the transmission gear 2 at a certain transmission ratio, and perform power output through an output shaft (not shown) coupled to the transmission gear 2. That is, when the wiper motor rotates, the wiper arm connected to the link mechanism of the wiper is operated through the output shaft, and thus a desired wiping action is achieved by means of the reciprocating motion of the wiper arm.

As described above, in the above-described conventional mechanical wiper motor, a predetermined position line determining function (specifically, in this case, for example, a park function) may be realized by means of a position line (specifically, in this case, for example, a park line) as a part of the wiper motor assembly, in which the current position of the wiper arm is monitored substantially by pulling down the level of the park signal of the wiper motor. For example, when the wiper arm returns to the stop position, the park wire of the wiper motor will be grounded accordingly, outputting a corresponding low level to the vehicle body control module, thereby making the control device such as the vehicle Body Control Module (BCM) aware of the current position of the wiper arm, i.e., that it is in the stop position. In addition, when the driver performs the action of turning off the wiper, the control device turns off the relevant relay only when it is detected in real time that the wiper arm is returned to the predetermined stop position, thereby cutting off the power supply to the wiper motor, thereby ensuring that the wiper can stay at the predetermined stop position. The above-described grounding function of the bit line needs to be realized by means of an appropriate position line connection structure (specifically, a bit line grounding structure in this case). As an example of a prior art parking line ground structure, an operation principle of a typical parking line ground structure applicable to the wiper motor shown in fig. 1 is described below with reference to fig. 2.

As shown in the plan view of fig. 2, as a part of a transmission device in the wiper motor assembly, a transmission gear (e.g., a worm wheel) 10 may be made of an insulating material, such as plastic, and a metal disc 20 is embedded on an end surface thereof. As described above, the driving gear 10 may be coupled with an output shaft (not shown) for power output to finally output power generated by the wiper motor to the wiper arm via an associated link mechanism.

Further, as shown in fig. 2, two conductive slides made of a conductive material and having an elongated shape, i.e., a stop wire slide 30 and a ground wire slide 40, may be provided in a suspended manner on, for example, a gear cover (e.g., the gear cover 5 shown in fig. 1) designed to cover the transmission gear 10 from the top. The stop line slide 30 and the ground line slide 40 extend parallel to the end face of the transmission gear 10, respectively, and are adjacent to each other and spaced apart in the circumferential direction of the transmission gear 10. One end (left end in fig. 2) of the stop position line slide 30 is suspended above the end face of the transmission gear 10, and the other end (right end in fig. 2) thereof is connected to a control device such as a vehicle body control module through a stop position line (not shown); one end (left end in fig. 2) of the ground wire sliding piece 40 is also suspended above the end face of the transmission gear 10, and the other end (right end in fig. 2) thereof is electrically connected to a ground wire (not shown), that is, a ground connection is made.

Furthermore, as can be seen from fig. 2, the stop line slider 30 and the ground line slider 40 are configured such that they can periodically make sliding contact with the metal disk 20 during the rotation of the transmission gear 10, respectively, and such that the stop line is connected to the ground line once (i.e., grounded once) by the short-circuit connection of the metal disk 2 every rotation of the transmission gear 10, thereby achieving the level pull-down of the required stop signal and thus the grounding function of the stop line.

As can be seen from the foregoing description, in the above conventional structure design, the metal disc 20, the stop line slider 30 and the grounding line slider 40 together constitute the required stop line grounding structure. The structure of the motor assembly comprising the parts is complex in structure and manufacturing process and high in production cost due to the fact that the grounding structure of the stop bit line comprises the parts. At the same time, static electricity is easily generated and accumulated on the metal disc due to friction between the respective related components in the above-described motor assembly (particularly, the transmission portion). For example, during actual operation, the rotational speed of the rotor of the wiper motor may be as high as 2500-3500 rpm, so that when the wiper motor is operated, for example, the worm of the wiper motor will rub the worm wheel violently, and the parking wire vanes and the grounding wire vanes will periodically come into sliding contact with the metal disk and thereby generate friction. When the next stop position line sliding sheet contacts with the metal disk, the static electricity will be discharged. The electrostatic discharge may cause problems such as an excessive spatial radiation of electromagnetic compatibility (EMC) and an excessive conducted disturbance. Furthermore, static electricity may also be discharged to the associated control device along the dead line, thereby increasing the risk of failure of the control device.

It is with sufficient recognition of the problems or disadvantages in the known art described above that the inventors of the present application propose a new technical solution that can reliably and conveniently realize the required ground wire grounding function without requiring significant changes to the basic structure of the existing motor assembly with a position determining function (which mainly changes the design of the position wire connecting structure, in other words, the structural design of the output shaft and the transmission gear).

Hereinafter, design points or main improvement portions of the motor assembly having the position determination function according to the exemplary embodiment of the present application will be described with reference to fig. 3 to 10, and descriptions of other portions that are not related to the main structural design or improvement points of the present application will be omitted.

Fig. 3 to 7 each show a transmission part in a motor assembly with a position determination function according to an exemplary embodiment of the present application in a schematic manner, wherein fig. 3, 4 each show a perspective view of their assembled state, and fig. 5 to 7 each show their disassembled state from different angles.

As shown in fig. 3 to 7, a transmission device in a motor assembly having a position determination function according to an exemplary embodiment of the present application includes a transmission gear 100 and an output shaft 200 coupled to the transmission gear 100.

As described above, in the case of a wiper motor assembly, the driving gear 100 may be, for example, a worm gear, which can transmit a rotational motion generated by a rotating shaft of a wiper motor to the output shaft 200 at a certain transmission ratio by a meshing action between worms fixedly connected to or integrally formed with the rotating shaft and output power to a given load, such as a link mechanism (not shown) of a wiper, via the output shaft 200.

As best seen in fig. 5 and 6, in the exemplary embodiment of the present application, the output shaft 200 having a cylindrical shape is provided with a conductive bump 210 protruding outward from an outer circumferential surface thereof, the conductive bump 210 having a circular arc-shaped circumferential surface. According to an embodiment of the present application, the conductive bump 210 is a cylindrical section, for example, having a sector-shaped cross section, protruding radially outward from the outer circumferential surface of the output shaft 200, but the present application is not limited thereto. Further, it is preferable that the conductive bump 210 is integrally formed (e.g., integrally molded) with the output shaft 200, but the present application is not limited thereto. For example, as an alternative, as shown in fig. 7, the conductive bump 210 may be formed separately from the output shaft 200 and may be fixed to the output shaft 200 by means of, for example, soldering or the like.

Further, as can be seen from fig. 5 to 7, the output shaft 200 has a first end (a lower end in fig. 5 to 7) for connection to a driven load and a second end (an upper end in fig. 5 to 7) opposite to the first end, wherein a conductive bump 210 is provided at the second end of the output shaft 200 and extends from a top surface thereof by a certain distance.

Accordingly, as shown in fig. 5, 7, according to an exemplary embodiment of the present application, the transmission gear 100 may be made of a non-conductive material, particularly, a plastic or resin material such as Polyoxymethylene (POM), and provided with a hollow cylindrical cap 110 preferably formed integrally therewith and protruding from one end surface (an upper side end surface in fig. 5, 7) of the transmission gear 100, the hollow cylindrical cap 110 being provided with a window 120 on an outer circumferential surface thereof. Further, as shown in fig. 6, the transmission gear 100 is provided with a central opening 130 through which the output shaft 200 passes and a groove 140 extending radially outward from the central opening 130 and complementary in shape to each other with the conductive bump 210.

As shown in fig. 3, 4, in the assembled state, the conductive bump 210 and the recess 140 are fitted to each other (more specifically, fitted to each other) so that the transmission gear 100 and the output shaft 200 are coupled together in a relatively non-rotatable manner and can rotate together, the second end portion of the output shaft 200 provided with the conductive bump 210 may partially enter the hollow cylindrical cap portion 110 after passing through the end surface of the transmission gear 100 via the central opening 130 and the recess 140, and a portion of the conductive bump 210 may be exposed through the window portion 120 and have an arc-shaped surface portion 220 exposed from the window portion 120. It is preferable that the arc surface part 220 is flush with circumferential surfaces of both sides of the window part 120 of the hollow cylindrical cap part 110 in the circumferential direction, i.e., the arc surface part 220 has the same radius as the outer circumferential surface of the hollow cylindrical cap part 110.

According to an exemplary embodiment of the present application, the output shaft 200 is made of a conductive material, particularly, a metal material such as stainless steel (e.g., C45 steel) or an alloy thereof, and is connected to the ground (e.g., the output shaft 200 is electrically connected to a ground Pin of the wiper motor).

With the above-described structural design, the conductive bump 210 protruding outward from the outer circumferential surface of the output shaft 200 in the present application can be used to form a desired position line connection structure (e.g., a parking line ground structure) together with a conductive position line slider (e.g., a conductive parking line slider) 300, which will be described below, disposed adjacent to the output shaft 200.

Further, it should be noted that, according to a predetermined design, the motor assembly with a position determining function according to the exemplary embodiment of the present application further includes, for example, a position line (not shown) for the motor, which is provided on the motor, and one end of which is electrically connected to the position line connection structure and the other end of which is connected to a control device (for example, a vehicle body control module in the case of a wiper motor), and during operation of the motor, the position line can be periodically applied with a predetermined potential (for example, connected to a voltage source to apply a low or zero potential or directly connected to ground) through the position line connection structure, so as to accurately acquire the current position of the load, and thus can perform a predetermined operation under the control of the control device.

Also, as described above, in the case where the motor is a dc wiper motor, the position line may be a stop line, the position line connection structure may be a stop line ground structure, and the output shaft may be ground-connected. In this case, during the operation of the motor, the stop bit line can be periodically connected to ground through the stop bit line ground structure to accurately obtain the current position of the load, and thus the power supply of the motor can be timely cut off when the load needs to stop operating under the control of the control device, thereby stopping the load at a predetermined position.

The basic configuration of the position line connection structure in the exemplary embodiment of the present application and the operation principle thereof are further described below with reference to fig. 8 to 10.

As shown in fig. 8 and 9, according to an exemplary embodiment of the present application, as part of the position line connection structure, a conductive position line slider (e.g., a conductive parking line slider) 300 is further provided at a position near the output shaft 200 (e.g., on a cover designed to cover the transmission gear 100 from the top, but not limited thereto).

More specifically, as shown in fig. 8, 9, the conductive position line slider 300 may be made of, for example, an elongated metal sheet (e.g., a copper sheet) having elasticity, and has a fixed end (left-side end portion in fig. 8, 9) electrically connected to the one end of the stop line and a free end (right-side end portion in fig. 8, 9) opposite to the fixed end, and the conductive position line slider 300 is configured such that one flat surface of the free end can be brought into sliding contact with the arc-shaped surface portion 220 of the conductive bump 210 exposed from the window portion 120 of the hollow cylindrical cap portion 110 in the assembled state in an elastically abutting manner during rotation of the output shaft 200.

Alternatively, the conductive position line wiper 300 may be in the form of an arc-shaped wiper shoe (not shown) that is partially disposed around the outer circumferential surface of the hollow cylindrical cap portion 110, the outer circumferential surface of which may be electrically connected with the one end of the parking line, and that has a recessed inner arc surface corresponding to the arc surface portion 220 of the conductive bump 210 and is elastically biased so that the inner arc surface thereof can be periodically brought into sliding contact with the arc surface portion 220 of the conductive bump 210 exposed from the window portion 120 of the hollow cylindrical cap portion 110 in an assembled state in an elastically abutting manner during rotation of the output shaft 200.

As is apparent from the above description, in the technical solution according to an exemplary embodiment of the present application, the output shaft 200 is designed to be made of a conductive material and adapted to be given a predetermined potential (for example, may be connected to a voltage source to give a low or zero potential, or directly make a ground connection), and the conductive bump 210 protruding outward from the outer circumferential surface of the output shaft 200 (in an assembled state, a portion of the conductive bump 210 may be exposed through the window portion 120 and has the arc-shaped surface portion 220 exposed from the window portion 120) may be used together with the conductive position line slider 300 disposed adjacent to the output shaft 200 to form a desired position line connection structure. In this case, as the motor rotates, the conductive position line sliding piece 300 slides over the circular arc-shaped circumferential surface of the conductive protrusion 210 on the output shaft 200 (more specifically, the arc-shaped surface portion 220 exposed from the window portion 120 in the assembled state) once per rotation of the transmission gear 100, and the conductive position line sliding piece 300 is applied with a predetermined potential once (for example, grounded once) per rotation of the transmission gear 100, so that the position line can be periodically applied with a predetermined potential through the position line connecting structure, and thus a predetermined position determination function and the like can be smoothly realized.

In addition, fig. 10 illustrates an operation state diagram of a position line connection structure in a motor assembly having a position determination function according to an exemplary embodiment of the present application. As can be seen from fig. 10, the arc surface portion (hatched area in the drawing) that can be exposed from the window portion 120 as described above in the assembled state may have a certain arc angle (i.e., a central angle in a cross section perpendicular to the central axis of the output shaft 200).

The arc angle may correspond to a circumferential length (i.e., a circumferential length of the arc surface portion) that the conductive bump 210 may make sliding contact with the conductive stop bit line slider 300 during rotation of the output shaft 200, which may be specifically determined according to practical needs, experience, related experiments, and the like, to ensure sufficient sliding contact area and time

As can be seen from the above detailed description, in the technical solution of the present application, by employing an output shaft made of a conductive material and capable of being directly given a predetermined potential and employing a position line connection structure mainly including a conductive position line slip piece disposed adjacent to the output shaft and a conductive bump protruding outward from an outer circumferential surface of the output shaft, one end of the conductive position line slip piece can periodically make sliding contact with a circular arc-shaped circumferential surface of the conductive bump along with rotation of the output shaft, so that a desired position determination function and the like can be achieved in a simple and convenient manner.

In contrast to the conventional prior art described previously, the present application may, for example, utilize an output shaft (e.g., a metal output shaft) made of a conductive material for direct ground connection, thereby eliminating, for example, a ground wire slip that needs to be disposed on the gear cover and connected to ground. In addition, this application utilizes the electrically conductive lug that sets up on the output shaft and the electrically conductive position line gleitbretter that is close to the output shaft sets up to carry out sliding contact, thereby saved the metal disc that sets up on the terminal surface of drive gear usually among the prior art. In addition, the output shaft of this application communicates with ground all the time in the course of the work, and the static electric charge that the friction between each part produced can be led away in real time and can not cause the electric charge accumulation to the electromagnetic compatibility scheduling problem that has solved the static problem that exists among the prior art and static brought has eliminated the risk in the motor application.

In addition, the position line connecting structure of the application comprises the least number of components (such as a conductive position line sliding sheet arranged adjacent to the output shaft and a conductive bump extending outwards from the outer peripheral surface of the output shaft), and the groove in the transmission gear and the conductive bump on the output shaft can be directly connected in a jogged mode, so that the manufacturing process can be simplified, and the production cost and the material cost can be saved.

The present application has been described in detail above with reference to specific embodiments. It should be apparent that the embodiments described above and shown in the accompanying drawings should be understood as exemplary and not limiting of the present application, and that the selection or application of various relevant components can be freely made by those skilled in the art based on the specific application, working environment, use requirements, and the like, in combination with the relevant knowledge or technology known in the art. Also, it is possible for those skilled in the art to make various changes or modifications thereto without departing from the spirit of the present application. Obviously, such variations or modifications do not depart from the scope of the present application.

Claims (10)

1. An electric motor assembly having position determining functionality, comprising:

a motor as a power drive source, the motor including a motor housing (1), a stator and a rotor accommodated in the motor housing (1), and a rotating shaft for outputting a drive torque generated by the motor;

a transmission device which is in transmission connection with the rotating shaft and comprises an output shaft (200) for power output, wherein the transmission device can transmit the rotating motion generated by the rotating shaft to the output shaft (200) at a certain transmission ratio and output power to a given load through the output shaft (200);

a position line for the motor and a corresponding position line connection structure, wherein one end of the position line is electrically connected with the position line connection structure and the other end of the position line is connected with a control device, the position line can be periodically endowed with a preset electric potential through the position line connection structure during the operation process of the motor so as to accurately acquire the current position of the load and thereby perform a preset operation under the control of the control device,

characterized in that the output shaft (200) is made of a conductive material and adapted to be given a predetermined electric potential, the position line connection structure includes a conductive position line slip (300) disposed adjacent to the output shaft (200) and a conductive bump (210) protruding outward from an outer peripheral surface of the output shaft (200), the one end of the position line is electrically connected to one end of the conductive position line slip (300), the conductive bump (210) has a circular arc-shaped peripheral surface and is configured such that the other end of the conductive position line slip (300) periodically comes into sliding contact with the circular arc-shaped peripheral surface of the conductive bump (210) with rotation of the output shaft (200).

2. The motor assembly with a position determining function according to claim 1, wherein the motor is a direct current wiper motor, the position line is a stop line, the output shaft (200) is grounded, and the stop line can be periodically grounded through the conductive position line slider (300) and the conductive bump (210) during the operation of the motor to accurately obtain the current position of the load, and thus can cut off the power supply of the motor timely when the load needs to stop the operation under the control of the control device, thereby stopping the load at a predetermined position.

3. The motor assembly with position determining function according to claim 1 or 2, characterized in that the conductive bump (210) is integrally formed with the output shaft (200).

4. The motor assembly with a position determining function according to claim 3, wherein the conductive bump (210) is a cylindrical section protruding radially outward from an outer peripheral surface of the output shaft (200).

5. The position-determining motor assembly as claimed in claim 4, wherein the cylinder section has a sector-shaped cross section.

6. The motor assembly with position determining function according to claim 1 or 2, characterized in that the conductive position line slide (300) is made of an elongated metal sheet having elasticity, and has a fixed end and a free end opposite to the fixed end, the fixed end being electrically connected with the one end of the position line, and the conductive position line slide (300) is configured such that one flat surface of the free end can periodically come into sliding contact with the circular arc-shaped circumferential surface of the conductive bump (210) in an elastically abutting manner during rotation of the output shaft (200).

7. The motor assembly with position determination function according to claim 1 or 2, characterized in that the output shaft (200) has a first end portion for connection to a driven load and a second end portion opposite to the first end portion, the conductive bump (210) is provided at the second end portion of the output shaft (200), the transmission means includes a transmission gear (100) made of a non-conductive material and a hollow cylindrical cap portion (110) integrally formed with the transmission gear (100) and protruding from one end surface of the transmission gear (100), a window portion (120) is provided on an outer circumferential surface of the hollow cylindrical cap portion (110), the transmission gear (100) is provided with a central opening (130) through which the output shaft (200) passes and a groove (140) extending radially outward from the central opening (130) and complementary in shape to each other with the conductive bump (210), the conductive bump (210) and the groove (140) are fitted to each other so that the transmission gear (100) and the output shaft (200) are coupled together in a non-rotatable manner via the second end portion of the transmission gear (100) and the hollow cylindrical cap portion (110) enters the hollow cylindrical cap portion (100), and a portion of the conductive bump (210) can be exposed through the window (120) and has an arc-shaped surface portion (220) exposed from the window (120).

8. The motor assembly with position determining function of claim 7, characterized in that the arc-shaped surface portion (220) is circumferentially flush with circumferential surfaces on both sides of the window portion (120) of the hollow cylindrical cap portion (110).

9. The motor assembly with position determining function according to claim 7, characterized in that the transmission gear (100) is a worm gear, and the transmission means comprises a worm fixedly connected or integrally formed with the rotation shaft and engaged with the worm gear.

10. The motor assembly with a position determining function according to claim 7, wherein the output shaft (200) is made of a metal or alloy material, and the transmission gear (100) is made of a plastic or resin material.

Images