SECURING ELEMENT FOR A BEARING ELEMENT

Abstract

The invention relates to a securing element (1; 1a) for a bearing device (50) in a housing (20) of a drive device (10), wherein the plate-like securing element (1; 1a) has two side legs (34, 35) and a base leg (36) which connects the side legs (34, 35), wherein, between the base leg (36) and the side legs (34, 35), there is formed a cutout (38) for receiving a shaft (12) which is mounted rotatably in a bearing (15), wherein the two side legs (34, 35) are designed to interact, by means of a first face side (21), with the bearing (15) and, by means of a second face side (23), with a stop surface (33) in the housing (20).

Claims

1. A rotor of a rotary electric machine, comprising: a body comprising a cylindrical central core and a circumferential plurality of arms extending radially out from the cylindrical central core, the body being intended to be mounted with the ability to move about an axis of rotation X; a coilset produced by windings of turns and forming at least one series of coils, a coil comprising a predetermined number of turns around at least two arms of the body, two adjacent coils of a series being angularly offset from one another with a partial overlap; and at least one additional retaining loop wound around at least two arms of which at least one is common to the arms around which is wound the last coil, situated radially outermost, of at least one series and of which at least one is distinct from the arms around which the said last coil is wound, so that the at least one additional retaining loop partially overlaps the turns of the said last coil.

2. The rotor according to claim 1, wherein the additional retaining loop is an additional retaining turn of at least one series of coils.

3. The rotor according to claim 2, further comprising two series of coils arranged at 180 with respect to one another with respect to the axis of rotation X.

4. The rotor according to claim 3, wherein one single series of coils comprises at least one additional retaining turn partially overlapping the turns of the last coils of the two series of coils.

5. The rotor according to claim 3, wherein the two series of coils each comprise at least one additional retaining turn.

6. The rotor according to claim 5, wherein the at least one additional retaining turn of at least one series of coils is produced between a plurality of arms of which at least one is an arm around which the last coil of the series is wound, and at least one is an arm around which the last coil of the other series of coils is wound, the at least one additional retaining turn of the series of coils partially overlapping the turns of the last coils of the series of coils.

7. The rotor according to claim 1, wherein the at least one additional retaining turn extends in a direction substantially equal to an angle of 360 divided by the number of poles of the rotary machine with respect to the direction of the turns of the last coil of a series.

8. The rotor according to claim 1, configured to collaborate with a stator of the rotary electric machine comprising a number of poles greater than or equal to four.

9. The rotor according to claim 8, wherein the angle covered by the arms around which a coil is wound is substantially equal to 360 divided by the number of poles of the stator of the rotary electric machine.

10. The rotor according to claim 1, further comprising a slip-ring provided with a plurality of terminals and configured to supply power to the coils of the rotor and wherein the additional retaining loop is a connecting wire connecting two terminals of the slip-ring.

11. A method of manufacturing a rotor of a rotary electric machine comprising a body having a cylindrical central core and a circumferential alternation of arms extending radially out from the cylindrical central core, the body being mounted with the ability to move about an axis of rotation X, the method comprising: a succession of steps of winding a predetermined number of turns of a coilset around at least two arms of the body to form at least one series of coils, the winding steps being performed in such a way that two adjacent coils of a series are wound around at least one common arm and at least one distinct arm, two adjacent coils of a series being angularly offset from one another with a partial overlap, an additional step of winding at least one additional retaining turn of the coilset around at least two arms of the body, of which arms at least one is common to the arms around which is wound the last coil of a series, situated radially outermost, and the other arm is distinct from the arms around which the last coil of a series is wound, the said at least one additional retaining turn partially overlapping the turns of the said last coil.

12. The method of manufacture according to claim 11, wherein the successive winding steps are performed in duplicate and simultaneously at a first place on the body and at a second place on the body that is diametrically opposite the first place so as to form two series of coils which are symmetric about the axis of rotation X.

Description

[0014] In the drawing:

[0015] FIG. 1 shows parts of an armature and of a housing of a windscreen wiper motor and a securing element in a perspective illustration,

[0016] FIG. 2 shows the securing element as per FIG. 1 in a side view,

[0017] FIG. 3 shows the components as per FIG. 1 in the installed state in a longitudinal section, and

[0018] FIG. 4 shows a securing element modified in relation to FIG. 2, likewise in a side view.

[0019] Identical elements or elements of identical function are denoted in the figures by the same reference designations.

[0020] FIGS. 1 and 3 illustrate individual constituent parts of a windscreen wiper motor 100. The windscreen wiper motor 100 has a drive device 10, which comprises inter alia an armature 14 with an armature lamination assembly 11 and armature windings (not illustrated). The armature lamination assembly 11 is fastened rotationally conjointly to a shaft 12 of the armature 14, wherein the shaft 12 is mounted rotatably about an axis of rotation 13. The mounting of the shaft 12 is performed by means of multiple bearing bodies or bearings 15, which are a constituent part of a bearing device 50, wherein one of the bearings 15 is illustrated in the form of a rolling bearing or ball bearing in FIG. 3.

[0021] The bearing 15 comprises an inner ring 16, which is fastened rotationally conjointly to the outer circumference of the shaft 12, for example by shrink-fitting. Furthermore, the bearing 15 comprises an outer ring 17, which is received, with the formation of an interference fit, in a receptacle 19 of the bearing device 50 of a housing 20, composed preferably of aluminium, of the windscreen wiper motor 100. Bearing bodies 22 are arranged, at uniform angular intervals about the axis of rotation 13, between the inner ring 16 and the outer ring 17.

[0022] Correspondingly to the illustration of FIG. 3, one face surface 24 of the bearing 15 bears axially against a step 26 of the receptacle 19. Also visible in FIG. 3 is a commutator device 28 of the drive device 10, which commutator device is received in a pot-shaped or cup-shaped housing portion 29.

[0023] To force the shaft 12 together with the armature lamination assembly 11 in the direction of the step 26, that is to say in the direction of the arrow 31 in FIG. 3 or of the axis of rotation 13, in order to compensate component tolerances and axial play, and to simultaneously fix the bearing 15 in the receptacle 19, use is made of a securing element 1 according to the invention of the bearing device 50, which securing element is, in the receptacle 19, correspondingly to the illustration of FIG. 3, supported by means of its two face surfaces 21, 23 axially between the inner ring 16 of the bearing 15 and a stop surface 33, running perpendicular to the direction of the arrow 31 or to the plane of the drawing of FIG. 3, of the receptacle 19.

[0024] The plate-like securing element 1 which can be seen particularly clearly in FIGS. 1 and 2 is composed of spring steel and preferably has a thickness d of between 0.8 mm and 1.2 mm, preferably of 1.0 mm. Said securing element is of U-shaped form in plan view with two side legs 34, 35 and a base leg 36 which connects the two side legs 34, 35 to one another. Formed between the side legs 34, 35 is a cutout 38 which is designed to receive the shaft 12 with play.

[0025] Correspondingly to the illustration of FIG. 1, the securing element 1 is introduced into the receptacle 19 of the housing 20 in the direction of the arrow 39 (perpendicular to the axis of rotation 13), wherein said securing element elastically deforms. It is essential here that, correspondingly to the illustration of FIG. 2, the securing element 1 is designed to be regionally bent in a direction running perpendicular to the two axes X, Y running in the plane of the securing element 1 (see FIG. 1). In the illustration of FIG. 2, the Y axis runs perpendicular to the plane of the drawing of FIG. 2. In the exemplary embodiment illustrated in FIGS. 1 to 3, the securing element 1 is designed to be regionally bent in the extent direction or along the two side legs 34, 35, and has, in an approximately central region in relation to the axial extent of the two side legs 34, 35, a bulge 40 which is formed by a radius R. The bulge 40 is formed uniformly on both face sides of the securing element 1, that is to say the material thickness of the securing element 1 is at least substantially equal in the region of the two side legs 34, 35. On both sides of the bulge 40, the securing element 1 has portions 41, 42 of planar form, which in the installed state of the securing element 1 in the receptacle 19 preferably bear flat against the abutment surface 33 of the receptacle 19 (FIG. 3). Furthermore, the securing element 1, in the region of the base leg 36, has an installation and stiffening portion 45 which is bent through 90 degrees and which serves for example for the handling of the securing element 1 during the insertion into the receptacle 19.

[0026] During the insertion or sliding of the securing element 1 into the receptacle 19 between the face surface 26, facing toward it, of the bearing 15 and the stop surface 33, the securing element 1 is elastically deformed in the region, in particular, of the bulge 40, such that the latter acts with an axial force on the shaft 12 in the direction of the step 26 or of the axis of rotation 13. For this purpose, it is essential that the securing element 1 has a structural height h perpendicular to the plane of the securing element 1 which is at least somewhat greater than the width w of the receptacle 19 between the bearing 15 and the stop surface 33. Furthermore, the width w of the receptacle 19 must be at least as large as the thickness d of the securing element 1.

[0027] The securing element 1a illustrated in FIG. 4 differs from the securing element 1 in that, on the side facing toward the installation and stiffening portion 45 and in the region of the bulge 40, an elevation 48 is additionally formed on each side leg 34, 35, which elevation is preferably formed by means of a stamping process. The elevation 48 serves for punctiform abutment against the inner ring 16 of the bearing 15.

[0028] The securing element 1, la thus described may be altered or modified in a variety of ways without departing from the concept of the invention.

LIST OF REFERENCE DESIGNATIONS

[0029] 1, 1a Securing element [0030] 10 Drive device [0031] 11 Armature lamination assembly [0032] 12 Shaft [0033] 13 Axis of rotation [0034] 14 Armature [0035] 15 Bearing [0036] 16 Inner ring [0037] 17 Outer ring [0038] 19 Receptacle [0039] 20 Housing [0040] 21 Face side [0041] 22 Bearing body [0042] 23 Face side [0043] 24 Face surface [0044] 26 Step [0045] 28 Commutator device [0046] 29 Housing portion [0047] 31 Arrow [0048] 33 Stop surface [0049] 34 Side leg [0050] 35 Side leg [0051] 35 Base leg [0052] 36 Cutout [0053] 38 Arrow [0054] 40 Bulge [0055] 41 Portion [0056] 42 Portion [0057] 45 Stiffening portion [0058] 48 Elevation [0059] 50 Bearing device [0060] 100 Windscreen wiper motor [0061] d Thickness [0062] R Radius [0063] h Structural height [0064] w Width [0065] X, Y Axis