Carbon brush holder plate for electric motor, windshield wiper motor, and method for assembling windshield wiper motor
阅读说明:本技术 用于电动马达的碳刷架板、风挡刮水器马达以及用于组装风挡刮水器马达的方法 (Carbon brush holder plate for electric motor, windshield wiper motor, and method for assembling windshield wiper motor ) 是由 斯格弗里德·斯蒂芬妮 于 2018-05-15 设计创作,主要内容包括:本发明涉及一种用于电动马达(10)的碳刷架板(50),该碳刷架板包括用于碳刷(52,53)的引导元件(55)、碳刷(52,53)的第一端面(54)、与第一端面(54)相对而置的第二端面(59)、以及用于在碳刷架板(50)的组装位置中将碳刷(52,53)的第一端面(54)与换向器(21)有间距地进行定位的装置,其中,碳刷(52,53)布置成在碳刷(52,53)的纵向轴线(57)的方向上能在引导元件(55)中纵向移位,第一端面设计成贴靠电动马达(10)的换向器(21),弹簧元件(62)在运行状态中在弹簧张力下贴靠第二端面,以便朝换向器(21)的方向按压碳刷(52,53)。(The invention relates to a carbon brush holder plate (50) for an electric motor (10), comprising guide elements (55) for carbon brushes (52, 53), a first end face (54) of the carbon brushes (52, 53), a second end face (59) opposite to the first end face (54), and means for positioning the first end face (54) of the carbon brushes (52, 53) at a distance from a commutator (21) in an assembly position of the carbon brush holder plate (50), wherein the carbon brushes (52, 53) are arranged so as to be longitudinally displaceable in the guide elements (55) in the direction of a longitudinal axis (57) of the carbon brushes (52, 53), the first end face is designed to abut against the commutator (21) of the electric motor (10), a spring element (62) abuts against the second end face under spring tension in an operating state in order to press the carbon brushes (52) in the direction of the commutator (21), 53).)
1. A carbon brush holder plate (50) for an electric motor (10) having guide elements (55) for carbon brushes (52, 53), a first end face (54) of the carbon brushes (52, 53), a second end face (59) which is arranged opposite the first end face (54), and means for positioning the first end face (54) of the carbon brushes (52, 53) at a distance from a commutator (21) in an assembly position of the carbon brush holder plate (50), wherein the carbon brushes (52, 53) are arranged so as to be longitudinally displaceable in the guide elements (55) in the direction of a longitudinal axis (57) of the carbon brushes (52, 53), the first end face (54) is designed to bear against the commutator (21) of the electric motor (10), and a spring element (62) bears against the second end face (59) under spring tension in an operating state, in order to press the carbon brushes (52, 53) in the direction of the commutator (21), characterized in that the device is formed by the spring element (62), wherein the spring element (62) in the assembled position bears against the end faces (60) of the carbon brushes (52, 53) under spring pretension, and the carbon brushes (52, 53) are pressed against the guide element (55) in the form of a friction-fit connection (78).
2. A carbon brush holder plate according to claim 1, characterized in that a release device (70) is provided, which is arranged to be in movable abutting contact with the second end face (59) of the carbon brush (52, 53) via a contact element (71), and which, upon contacting the second end face (59) and upon further movement of the contact element (71), is designed to displace the carbon brush (52, 53) in the guide element (55) in the direction of the longitudinal axis (57) such that the spring element (62) establishes an operative connection with the second end face (59) of the carbon brush (52, 53).
3. A carbon brush holder plate according to claim 2, wherein in an abutment area between the carbon brush (52, 53) and the contact element (71), the second end face (59) and/or the contact element (71) is arranged at an oblique angle (α, β) with respect to the longitudinal axis (57) or with a chamfered edge (79).
4. A carbon brush holder plate according to claim 2 or 3, characterized in that the contact elements (71) of the release means (70) are resiliently arranged by means of spring sections (72).
5. The carbon brush holder plate according to claim 4, wherein the carbon brush holder plate (50) is made of plastic, and the contact elements (71) are integrally formed at the carbon brush holder plate (50) through the spring sections (72).
6. A carbon brush holder plate according to any of claims 2-5, characterized in that the release means (70) comprises a follower element (73) arranged in operative connection with the contact element (71).
7. The carbon brush holder plate according to any one of claims 1 to 6, wherein the spring element (62) includes a curved contact section (69) that is capable of abutting against the lateral surface (61) and the second end surface (59) of the carbon brush (52, 53).
8. An electric motor (10) having an armature (20) comprising a commutator (21) and a carbon brush holder plate (50) constructed according to any one of claims 1 to 7.
9. Electric motor according to claim 8, characterized in that the electric motor (10) comprises a motor housing (28) which is connectable to a transmission housing (12) and which is provided with an operating section (75) which is positionable against a movably arranged follower element (73) of the release device (70).
10. The electric motor according to claim 9, characterized in that the maneuvering section (75) is formed by a section of the motor housing (18).
11. A windshield wiper motor (100) having an electric motor (10) constructed according to claim 9 or 10.
12. A method for assembling a windshield wiper motor (100) according to claim 11, wherein such assembly comprises at least the steps of:
-pre-assembling the carbon brush holder plate (50) at the transmission housing (12), wherein the carbon brushes (52, 53) are arranged in an assembly position,
-axially engaging the armature (20) and the motor housing (28) in a direction towards the transmission housing (12), wherein the armature (20) moves past the carbon brushes (52, 53) with a spacing,
-bringing the actuating section (75) into contact with and relatively moving a follower element (73) of the release device (70), wherein the carbon brush (52, 53) is moved in the guide element (55) in the direction of the commutator (21), and wherein the spring element (62) is brought into contact with a second end face (59) of the carbon brush (52, 53) and the carbon brush is pressed against the commutator (21).
Technical Field
The present invention relates to a carbon brush holder plate for an electric motor according to the preamble of claim 1. The invention also relates to an electric motor, a windscreen wiper motor with a carbon brush holder plate according to the invention, and a method for assembling a windscreen wiper motor.
Background
Brush-holder plates for electric motors having the features of the preamble of claim 1 are known in practice. In an electric motor equipped with a brush holder plate of this type, the carbon brushes arranged so as to be longitudinally displaceable in the region of the brush holder plate bear against the web portions of the commutator of the armature of the electric motor when the electric motor is in operation. When assembling an electric motor as an integral part of a windscreen wiper motor, the carbon brush holder plate is fastened to the transmission housing of the windscreen wiper motor in an intermediate assembly step. The armature then has to be guided through the through-opening of the carbon brush holder plate by its armature shaft, which has a drive worm on the side facing the gear housing, until the web portion of the commutator at the armature shaft is at the level of the carbon brushes. During this preassembly, it is important to arrange the carbon brushes in a position set back relative to the operating state and spaced apart from the commutator, so that the carbon brushes do not come into contact with the armature shaft or the commutator when the armature shaft is axially engaged and can be damaged in the process. For this purpose, auxiliary devices are usually used, for example, which, when the armature shaft is axially engaged, hold the carbon brushes in the retracted position against the spring force of the spring elements, which urge the carbon brushes in the direction of the commutator. Subsequently, in an additional assembly step, the auxiliary device, which is a separate component, is again brought out of contact with the carbon brushes, thereby bringing them into contact with the commutator.
Furthermore, conical additional elements are known from the prior art as components of armature shafts, which are arranged on the end side of the commutator on the side facing away from the armature coils in the joining direction of the armature shafts and can remain in the electric motor or in the windshield wiper motor after assembly. When the armature shaft is engaged, an end surface of the carbon brush facing the armature shaft comes into contact with the additional element and is pressed outward in the axial direction by the additional element. In this case, depending on the size of the angle at the additional element, an undesirably high load may be generated on the end face of the carbon brush, particularly when the additional element impacts the end face of the carbon brush at a high speed or with a large impulse at the time of assembly.
Disclosure of Invention
An advantage of a carbon brush holder plate for an electric motor according to the invention having the features of claim 1 is that the positioning of the axial recession of the carbon brushes can be achieved without additional separate parts during assembly of the electric motor or during axial engagement of the armature shaft with the carbon brush holder plate.
The invention is based on the following idea: the spring element, which is present to exert the required contact pressure of the carbon brush against the commutator, is arranged to be operatively connected to a lateral surface of the carbon brush in the assembly position such that the carbon brush is pushed in its guide element by the spring pretensioning of the spring element in the direction of a side wall of the respective guide element which is opposite the spring element, wherein the contact pressure caused by the spring element is so high that a friction-fit connection is formed between the carbon brush and the guide element, which friction-fit connection holds the carbon brush in a position in which an end face of the carbon brush facing the commutator is arranged spaced apart from the armature shaft or the commutator. Advantageous developments of the carbon brush holder plate for an electric motor according to the invention are set forth in the dependent claims. All combinations of at least two of the features disclosed in the claims, the description and/or the drawings fall within the scope of the invention.
A release device is provided for enabling the carbon brushes to be moved from a position in which they are spaced apart from the commutator to contact the commutator in an abutting manner during assembly of the electric motor. The release device has a contact element which can be brought into contact with a second end face of the carbon brush facing away from the commutator, and which, when the contact element is in contact with the second end face and is moved further, displaces the carbon brush in the guide element in the direction of the longitudinal axis toward the commutator, so that the spring element can be brought into operative connection with the second end face of the carbon brush.
In a further embodiment, the second end face of the carbon brush and/or the contact element of the release device are arranged at an oblique angle relative to the longitudinal axis or have a chamfer in the contact region between the carbon brush and the contact element. This embodiment results in a continuous, i.e., smooth running of the spring elements in the direction of the second end face of the carbon brush when the carbon brush is displaced in the longitudinal direction in the guide element, and furthermore, the spring elements can follow the geometry of the carbon brush in a particularly simple manner when the spring elements sweep or move along the carbon brush over the carbon brush, and flaking and the like of the carbon brush can be avoided.
In order to be able to move the contact elements of the release device along the carbon brushes as desired, it is provided that the contact elements are arranged elastically at the release device by means of spring sections. Furthermore, a configuration of this type makes it possible to design the release device in one piece in the form of a plastic injection-molded part in a particularly simple manner.
In a further preferred refinement of the last proposal, which makes possible a particularly simple, cost-effective and precise production of the carbon brush holder plate and of the release device, it is proposed that the carbon brush holder plate is made of plastic and the contact elements are integrally formed at the carbon brush holder plate by means of spring sections.
In order to be able to carry out a targeted movement of the contact element at the carbon brush, which movement is dependent on the assembly of the components of the electric motor, it is provided that the release device has a follower element, which is arranged in operative connection with the contact element. The follower element is typically in abutting contact with a mating element (for example a motor housing) when the individual parts of the electric motor are assembled and is moved together in a manner corresponding to the movement of the motor housing when the motor housing is assembled, as a result of which the contact element simultaneously causes a movement of the carbon brushes in the guide element in the desired manner.
In order to avoid damage to the carbon brushes (which could lead to flaking or the like), in particular when the spring element is moved along the surface of the carbon brushes, it is also preferably provided that the spring element has a contact section of curved design, which can abut a lateral surface of the carbon brushes and a second end face of the commutator facing away from the armature. During the movement of the carbon brush in the guide element, the contact section of the bent configuration slides along the lateral surface of the carbon brush and then penetrates into the region of the second end face of the carbon brush.
The invention also relates to an electric motor having an armature comprising a commutator and a carbon brush holder plate designed in the manner according to the invention.
In order to be able to positively actuate the release device or bring the carbon brushes into contact with the commutator when assembling the components of the electric motor, in a preferred embodiment of the electric motor, it is provided that the electric motor has a motor housing which can be connected to the gear housing and at which an actuating section is provided which can be positioned so as to bear against a movably arranged follower element of the release device.
The invention also includes a windshield wiper motor having the electric motor described above.
The method for assembling a windscreen wiper motor according to the invention is provided with at least the following assembly steps: first, the carbon brush holder plate is preassembled at the transmission housing of the windshield wiper motor, wherein the carbon brushes are arranged in an assembly position spaced apart from the commutator of the electric motor. Subsequently, the armature and the motor housing are axially joined in the direction of the gear housing, wherein the armature moves past the carbon brushes at a distance. Finally, the actuating section of the motor housing is brought into contact with and moved relative to the follower element of the release device, wherein the carbon brush is moved in the guide element in the direction of the commutator, and wherein the spring element is brought into contact with a second end side of the carbon brush facing away from the commutator, and presses the carbon brush against the commutator.
Drawings
Further advantages, features and details of the invention will emerge from the following description of a preferred embodiment and from the accompanying drawings, in which:
FIG. 1 shows the basic components of a windshield wiper motor in an exploded view;
fig. 2 is a perspective view showing basic parts of a carbon brush holder plate according to the present invention;
fig. 3 shows a top view of the carbon brush holder plate according to fig. 2 in a preassembly position, in which the carbon brushes are arranged in a locked position spaced apart from the commutator of the electric motor;
figure 4 shows a section in the plane IV-IV of figure 3;
fig. 5 shows a plan view of the carbon brush holder plate according to the illustration of fig. 3, in which unlocking of the carbon brush takes place;
FIG. 6 shows a cross-section in plane VI-VI of FIG. 5;
fig. 7 to 9 respectively show in perspective view the carbon brush holder plate according to fig. 2 during various stages of the assembly of the electric motor;
FIG. 10 shows a side view of a subregion of the windshield wiper motor of FIG. 1; and is
Fig. 11 shows the detail of fig. 10 in an enlarged view in the final assembled state of the windshield wiper motor.
In the figures, identical elements or elements having an equivalent function are provided with the same reference symbols, respectively.
Detailed Description
Fig. 1 shows the basic components of a
The
The
The
When assembling the
During the insertion of the
The carbon
The carbon brushes 52, 53 are arranged so as to be displaceable in the direction of the
In addition to the
Fig. 2 also shows a connecting
The
Furthermore, a
As can be seen in particular from the illustration in fig. 4 and 6, the
As can be seen from fig. 10 and 11, on the side facing the
Fig. 3, 4 and 7 show the mentioned assembly position of the carbon
Furthermore, it can be seen from fig. 4 that, in the assembled position, the
The above-described carbon
List of reference numerals
10 electric motor
12 Transmission housing
13 driven shaft
14 Transmission cover
15 connection region
16 driving device
17 drive gear
19 piece part
20 armature
21 commutator
24 armature shaft
26-worm type meshing section
28 Motor casing
29 fastening screw
30 screw hole
31 arrow head
32 longitudinal axis
33 connecting plug
50 carbon brush frame plate
51 through opening
52. 53 carbon brush
54 first end face
55 guide element
56 open cross section
57 longitudinal axis
59 second end face
60 lateral surface
61 lateral surface
62 spring element
63 connecting twisted wire
64 suppression choke
65 connection port
67 bump
68 spring section
69 end section
70 Release device
71 contact element
72 spring section
73 follow-up element
74 contact surface
75 section (c)
76 arrow head
77 recess
78 friction fit connection
79 chamfering
100 windshield wiper motor
- 上一篇:一种医用注射器针头装配设备
- 下一篇:发光装置和投影仪