HUE028651T2

HUE028651T2 - Brush brake

Info

Publication number: HUE028651T2
Application number: HUE12758414A
Authority: HU
Inventors: Ivano Marinelli; Thomas Rinn
Original assignee: Schunk Italia S R L
Priority date: 2011-08-08
Filing date: 2012-08-08
Publication date: 2016-12-28
Also published as: EP2742568B1; EP2742568A1; CN204464719U; WO2013021016A1

Abstract

The invention relates to a brush holder (10) for accommodating a carbon brush (12), having a guide housing (11) in which the carbon brush is accommodated and arranged in a longitudinally displaceable manner, wherein the guide housing has guide walls (13, 14) for forming a sliding contact with the carbon brush, and at least one guide wall (13) has an extension (22), which is connected in an elastically resilient manner to the guide wall and projects into an accommodating chamber (17), defined by the guide housing, such that abutment against a side surface (15) of the carbon brush blocks sliding movement of the carbon brush in the guide housing, wherein the extension (22) is formed on a carrier element (21) which is arranged in a window opening (20) of the guide wall, spans the window opening and is connected to the guide wall at each of its two axial ends.

Description

Carbes brush brake

The present invent!»». relates, to- a hrus.h bolder for accommodating a carbon brush, end)pricing a guide housing for aceommobnung and arranging a carbon brush in a longitudinally displaceable manner, wherein the guide housing has guide walls for forming a sliding contact with the carbon brush, and at least one guide wail has a protrusion, which Is connected to the guide wail and protrudes into an accommodating cham- her defined by the guide housing, such that abutment of the protrusion against a side surface of the carbon rush causes a sliding motion of the carbon brush in the guide housing to be blocked.

Carbon brushes of the type nmntioned in the introduction in combination with the carbon brush accommodated therein form a carbon brush mod" ole, which is mounted on a brush carrier of an electric motor in such a manner that the contact surface of the carbon brush can be brought into electrically conductive contact with the segments of a commutator of the electric motor- For getterating the necessary comae; pressure with which the carbon brush is directed against the commutator, the brush holder is provided with a pressure spring, usually Implemented as a coil spring. which is arranged between a rearward axial support surface of the carbon brush and a support formed on the brush holder. The pressure spring has the purpose of pushing the ear bop brush out of the brush holder, so that it is necessary to secure the carbon brush modules in the brush holder during the transport írom the maoolecturer oi the carbon brush modules to the. manufaetprer of the electric motors and during the mounting of the carbon brush modules on the brush carrier of the electric motor,

For temporarily securing the carbon brushes in the carbon holder, so-called brush brakes were developed, which provide a flexible tongue at a guide wail of the brush bolder, which abuts with sufficient clumping force against the carbon brush in a transport and mounting configuration of the carbon brush module so as to keep the carbon brush in position within the brush holder against the effect of the pressure spring and to prevent the carbon brush from protruding out of the brush holder in an undesired manner. To transfer the carbon brush module into an operating ermfiguration, In which the force of the pressure spring enables the carbon brush to slide within the brush bolder, a sufficient pressure Is exerted on the axial support surface of the carbon brush so that the clamping contact between the carbon brash and the elastic tongue is loosened by way of a sufficient displacement of the carbon brush within the brush holder.

The formation of the brush brakes implemented as a flexible tongue has proven to be very complex because a correspondingly complex adaption of the brush holder is necessary due to the cantilever-type design of the flexible longue. Moreover, the known brush brake proves to he relatively flexible owing to the gap til ever-iype: design so that a secure clamping effect for maintaining the transport, and mounting configuration cannot al ways be guaranteed, in particular In pressure springs with a relati vely high spring constant, US 3 bad 01S A shows a brush holder for ae com mod a ting a carbon brush, comprising a guide housing for accommodating and arranging a carbon brush is a Icrngiindfnajly displaceable manner', wherein the guide housing has guide walls for forrning a sliding contact with the carbon brush. One guide wall has a protrusion, which is connected to the guide wall and protrudes into an accommodating chamber defined by the guide housing, such that abuoneat of the protrusion against a side surface of the carbon rush causes a sliding motion of the carbon brush in the guide housing to be blocked.

The protrusion known from US 3 656 CHS A is produced by introducing an indentation or impression directly into the guide wall.

From D£ 10 5005 058 833 A I, a brush holder is known that has a device for vibration damping, which is supposed to damp vibrations of the carbon brush occurring during contact between the carbon brush and a commutator of an electric motor. For this purpose, a guide housing of the brush holder hay elastically resilient carrier elements arranged opposite each other in parallel guide walls and, provided 'with a protrusion for abutment against the carbon brush, DB 10 2009 034 834 At shows a brush holder that, like the brush holder known from DB !0 2005 055 833A1 described above, is provided with a device for vibration damping. The carrier element known from DE 10 2009 034 884 Al, used for vibration damping and having a protrusion abutting against the carbon brush. Is realized as a clamp device that has an elastic portion, completely surrounds the circumferenec of the guide housing and is connected to a guide wall of the guide housing via weld points |u such a rn a oner that the carrier element extends beyond an edge recess at the forward axial edge of the guide housing.

It is the object of the invention to propose a brush holder that comprises a brush brake which can be produced with simple means and still functions reliably.

To attain lids object, the brush holder according to the invention embodies the features of claim 1.

In the brush holder according to the invention, the protrusion is arranged on an eiastfeialy resilient carrier element arranged in a window opening of the guide wall, the carrier element spanning the window opening and being connected to the guide wall at each of its two axial ends.

On the one hand, the arrangement of the carrier efeincnt with both axial ends at the guide wail allows for a design of the carrier winch is stiff compared to a carrier element that is formed at the guide wail in the manner of a cantilever, so that the protrusion of the carrier element abuts with eorresporforngly strong force against the carhop brush and thus a secure positioning of the carbon brush in the transport configuration of the brush holder can also be achieved in eases where the pressure spring has a relatively high spring constant and consequently exerts a correspondingly strong pressure three on the carbon brush.

On the other hand, the bilateral axial connection of the carrier element to the guide wall allows for a relatively simple production of the carrier element by forming suitable perforations in the guide wall, which can be formed as narrow slots or also as large-scale openings, depending on how large the window opening is supposed to be.

It proves particularly advantageous if the carrier dement is formed in the direction of a longitudinal axis of the brush holder because in this way the length of the carrier clement and thus -ts flexural stiffness can be varied to a much larger degree than if the carrier element was arranged transversally to the longitudinal: axis, of the brush holder.

It is particularly advantageous If the carrier element divides the window' opening into two partial windows, each of which extends from the carrier element to the lateral guide walls of the brush holder adjoining the guide Wail because in this manner a simple look at the window opening is sufficient to determine whether the carbon brush module is in the transport configuration.

Moreover, it proves particularly advantageous if the carrier element is formed by an integral segment of the guide wail so that a spaced connecting procedure for connecting the earner element with the guide wall, is unnecessary.

If the protrusion of the carrier element is formed by a projection shaped by impression in the carrier element, this protrusion can be formed in a particularly preferred emhodirneM siornlianeously to the prod notice of the carrier clement it sc Hi e.g, by way of a combined perforation and Impression process, in which the afore-mentioned window opening can be produced by perforation and the protrusion cap be produced by impression. if the protrusion: of the carrier elemem has a contact surface that is planar and formed parallel to the guide wall, It is ensured that, In. particular in the case of relatively soft carbon brushes, nudes!rod damage of the carbon brush, by the protrusion can be precluded.

In particular in cases where, instead of a pressure force acting as a load per surface, a rather linearly acting pressure force is to be generated by the protrusion. If Is advantageous if the protrusion, has a convex contact surface.

Is order to provide for a contact surface that is plane and formed parallel to the guide wall and also to form a convex contact surface, the protrusion can. be profiled in a 11 -shaped manner, whereas for providing for a contact force between the protrusion and the carbon brush acting as linearly as possible, a V-shaped prof ié of the protrusion proves advau-lagoons.

In the following, preferred embodiments of the brush holder according to the invention are explained In more detail with the aid of the drawing.

Fig. 1 shows ssi isometric view of a first embodiment of the brush holder;

Fig. 2 shows' a top view of the brush holder illustrated m Fig, It

Fig. 3 shows a sectional view of the brash holder illustrated in Fig. 2 according to the path of the cutting line 01-10 in Fig. 2;

Fig. 4 shows air enlarged detailed illustration of the detail marked IV In Fig, 3;

Fig. s shows a top view corresponding to Fig. 2 of another em- hodiment of the brush holder;

Fig. b shows a sectional view of the brush holder illustrated in Fig. S according to the path of the cutting line VI - VI in Fig 5:

Fig. 7 shows a detailed view of the detail marked VII in Fig. 6.

In Figs. I to 3, a carbon brush module comprising a brush holder 10 is illustrated, which, according to the isometric view of Fig. has a guide housing 1 !, which serves to aeoonimodate a carbon, brush 12, In the case at hand, the guide housing I I has both horizontal guide walls 13 and vertical, guide wails 14. which serve to form a sliding contact to correspondingly arranged horizontal side surfaces 15 and vertical side surfaces lo of the carbon brush 12. In this contest, the guide walls 13, 14 of the guide housing It. deihnii an aeeomotodatmg chamber IT, in which additionally to the carbon brash 12 a coil spring 13 is accommodated, which upon insertion of the brush holder exerts a contact pressure with which an axial contact surface 30 of the carbon brush 12 abuts against a commutator (not illustrated) of an electric motor or the like.

Fig, 1 shows the carbon brush module with the carbon brush 1:2 inserted: into the brush holder 10, more precisely into the accommodating space: 17 of the brush holder HI, In a transport and mounting eonfigttratlon prior to installation of the carbon brush module on an electric motor. wherein the carbon brush 1 2 is locked in. the guide housing I I. by a device hereinafter called brush brake 19 so as to block a sliding motion in the guide bousing 11 of the brush holder 10. For the formation of the brush brake I 9. in the exemplary embodiment at hand, a window opening 20 Is formed in the upper horixonisl guide wall 13, said window opening 20 being spanned hy a carrier element 21, on which a protrusion 22 is formed, which protrudes to the inside, he, into the accommodating space 18, and which abuts in an elastic ally resilient manner against the upper horizontal side surface IS of the carbon brush 12 in the transport and mounting configuration illustrated in Fig, 1. in this ease, the clastic resiliency of the carrier element 21 is set such that the pressure force exerted on the carbon brush 12 hy the carrier element 2.1, or more precisely by the protrusion 22 formed on the carrier element 21, is strong enough to generate a friction force R in the contact surface between the protrusion 22 and the carbon brush 12, which R Is at least as strong as the pre-tensioning force V of the pre-tensloned coil spring lb illustrated in Fig.. 1.

To transfer the transport and mounting configuration illustrated in Fig, 1 into an operating configuration in which a sliding of the carbon brush 1. 2 in the guide housing i 1 is possible, i.e., for example, after the brush module illustrated in Fig, 1 has been mounted on the brash carrier of an electric motor, the blocking of the carbon brush 12 effected by the brush brake 19 can he released hy sufficiently high pressure to a rearward axial support surface 23 of the carbon brush 12, against 00110¾ the coil spring IB abut a.

In Figs. § to ?, a brush holder 30 is illustrated, which, as can be taken in particular from an integrated view of Figs, n and t'n comprises a carrier element 31 that has a protrusion 32 which is profiled in a T-shaped manner instead of a prihrasion 22 of the carrier element 21, which has a fkshaped form in the cross-section. In contrast to the protrusion 22 or the carrier element 21 shown in art enlarged detailed clew In Fig, 9, which has a go ft tact surface 33 that is place and formed parallel to the guide wall 13, the protrusion 32 is provided with a convex contact surface 34 that protrudes like a roof because of the V - a ha pee profile of the protrusion 32 of the carrier clement 31 illustrated in particular in Fig, 7 The contact surface 34 has a rather linear contact to the carbon brush not ifin sir a ted in Fig. 7 ana thus forms a comparatively stronger friction force In the contact surface 34.

In the brush holders 10 and 3d, correspondingly, the window opening 20 is preferably formed such that by arranging the carrier element 21 and 31, two partial windows 35, 36 arc formed, which permit art unhindered view of the upper horizontal side surface 15 of the carbon brush 12 and thus in particular a visual cheek of the sliding motion taking plane between the vertical side surfaces 16 of the carbon brush 12 and the guide walls 14 of the guide housing 11, as can be taken Ip particular from the top view illustrated in Fig, I.

Claims

KmwEwéK 1 «Brush your hair (IQ, 30) burn? the wall (12) is hungry, the brush holder having a guide housing (1 1) adapted to accommodate and longitudinal sliding of the carbon brush, wherein the kidney scissors are provided with a suitable wall wall & at least one leader! (13) has a protrusion (22, 23) connected to the main wall of the conductor extending over a guide defined by the driver. Also defined in a receiving space (17) or chamber, such that a side wall (15) of the carbon brush causes a blockage of the sliding movement of the carbon brush in the guide housing, characterized in that the protrusion (22) is on an elastically springing support (21). , 31) or on a support member located in a window opening (20) of the guide wall, bridging the window opening, and a. with a guide wall at both axial ends.

Brush holder according to claim 1, characterized in that the bracket (21, 31) extends in the direction of a longitudinal axis of the brush brush (10, 30).

3> Brush holder according to claim h or 2, characterized in that the bracket (21, 3-1) divides the window opening (20) into two partial windows 135, 36, each of which is a support for eeee total at {13 } The boundary lateral strap (14) extends.

A support according to any one of the preceding claims, contemplating that the carrier element, or support (21, 31), is formed by a part (segment) or segment comprising a member (13) with a wall (13);

5, A holder according to any one of the preceding claims, characterized in that a. protrusion (22, 32) of bracket (21, 31) in the holder d ο n bor n y o mo! formed as a protruding part,

6> Brush holder according to any one of the preceding Claims, characterized in that the protrusion (22, 23) of the support (2!) Is flat and the guide wall! (13) parallel training contact surface duty

7, characterized in that the protrusion (32) of the support (31) has a convex contact surface;

8. The holder according to any one of the preceding claims, characterized in that the protrusion (22) of the holding sleeve (21) is t-shaped transversely to the longitudinal direction of the support. profiled,

9, A holder according to claim 7, characterized in that the protrusion 132 of the support (31) is profiled in the V-shape transverse to the longitudinal direction of the brush holder.