Brush holder for electric traction motors for locomotives

Abstract

Brush holder for electric traction motors for locomotives, included in the electrical field, refers to an improvement applied to a brush holder, used in electric traction motors for locomotives, which electric coupling device is especially adapted to sustain, support and press the brush over a commuter of an electric motor rotor, while its body is connected to electric connections, being said device structurally sustained by means of isolated shafts which are connected to the locomotive structure.

Claims

1. Brush holder for electric traction motors for locomotives, being the brush holder (1) intended for a direct current motor used to support, press and support at least one brush (2) on the commuter, which brush holder (1) is constituted by a monoblock base (3), characterized by comprising: at least one linking pin (4) on the rear part of said monoblock base (3), according to the assembly of the brush holder (1) to the structure of the electric motor; at least one rectangular groove (6) located at parallel to each other, wherein each one of such grooves is adapted to match a brush (2) and which lower edges are projected through the outlet (11) included in the lower edge of said grooves (6); at least one compliant linking means to link at least one brush terminal (10); at least two pairs of legs (15′, 17′), each one having a guide hole (15, 17) through which each one has a central shaft (D2, D3), which direction is parallel to the rotation shaft (D1) of the commuter; at least one pressure device, comprising a front shaft (14) and a rear shaft (16), received in the respective guide holes (15, 17), a front shaft (14) and a rear shaft (16) are able to turn around their respective shafts (D2, D3); and at least one compliant pressure finger (12) to press the brush (2) on the commuter of the electric motor; each pressure finger of the brush holder comprises: an appendix (12a) surrounded by a semicircular or flat cable (12c) which is located at an edge; a “U”-shaped segment (12d), located at the medium part of the pressure finger (12); a helical spring (12f) connected to said “U”-shaped segment (12d) by a segment (12e); and a free edge (12g) located at the opposed edge of said pressure finger (12); a guide wheel (13), defined by a hub and a rim, wherein said rim is partially surrounded by the helical spring (12f) and said front shaft (14) is inserted between said hub and the rim; a linking arm (18) is assembled on the rear shaft (16) by flat rollers (20), said linking arm (18) having a groove (19), wherein, when the free edge (12g) of the pressure finger (12) is fitted to said groove (19), the pressure finger (12) is kept and shaped to press the brush (2) towards a partially radial direction to the commuter with a considerably constant force.

2. Brush holder for electric traction motors for locomotives, of claim 1, characterized by comprising two pressure fingers (12) per brush (2).

3. Brush holder for electric traction motors for locomotives, of claim 1, characterized by the connection, on the rear part of the monoblock base (3), being a pair of linking pins (4), surrounded by an isolating material (5).

4. Brush holder for electric traction motors for locomotives, of claim 1, characterized by the monoblock base (3) having compliant front openings (7) to provide a passage for the pressure finger (12) when the brush is worn.

5. Brush holder for electric traction motors for locomotives, of claim 1, characterized by the grooves (6) having tangential measurements “t” between 23.00 mm and 28.00 mm and axial measurements “a” between 40.00 mm and 57.00 mm.

6. Brush holder for electric traction motors for locomotives, of claim 1, characterized by the monoblock base (3) comprising at least one protrusion (8) designed on the external portion of the rectangular recesses (6), being said protrusion compliant to link at least one brush terminal (10) by means of a bolt (9).

7. Brush holder for electric traction motors for locomotives, of claim 1, characterized by the brush holder (1) being used for an electric motor of a railway traction motor.

8. Brush holder for electric traction motors for locomotives, of claim 1, characterized by the railway traction motor being a railway diesel locomotive.

9. Brush holder for electric traction motors for locomotives, which brush holder (1) is intended for a direct current motor used to support, press and support at least one brush (2) on the commuter, which brush holder (1) is constituted by a monoblock base (3), characterized by comprising: at least one linking pin (4) on the rear part of said monoblock base (3), according to the assembly of the brush holder (1) on the structure of the electric motor; at least one rectangular groove (6) located at parallel one to each other, wherein each one of these grooves is adapted to match a brush (2) and which lower edges are projected through an outlet (11) included in the lower edge of said grooves (6); at least one linking means compliant to link at least one brush terminal (10); at least two pairs of legs (15′, 17′), each one having a guide hole (15, 17) through which each one has a central shaft (D2, D3), which direction is parallel to the rotation shaft (D1) of the commuter; at least one pressure device, comprising a front shaft (14) and a rear shaft (16), received in the respective guide holes (15, 17), wherein a front shaft (14) and a rear shaft (16) are able to turn around their respective shafts (D2, D3); and at least one pressure finger (12), compliant to press the brush (2) on the commuter of the electric motor; both pressure fingers (12) of the brush holder (1) are connected by a segment (12b) extending along the axial direction of the commuter; a pressure device used to maintain and press at least one brush (2) in the commuter of a direct current motor, when said brush (2) is assembled in a brush holder (1), said pressure device being constituted by: a front shaft (14) and a rear shaft (16) located along a shaft (D2, D3) which is parallel to the rotation shaft (D1) of the commuter, wherein said front shaft (14) and rear shaft (16) are received in guide holes (15, 17) located on the brush holder (1); two pressure fingers (12) compliant to press the brush (2) on the commuter of the electric motor, wherein each pressure finger (12) comprises an appendix (12a) surrounded by a semicircular or flat cable (12c) located at an edge, a “U”-shaped segment (12d), located on the medium part of the pressure finger (12), a helical spring (12f) linked to said “U”-shaped segment (12d) by a segment (12e) and a free edge (12g) located on the opposite edge of said pressure finger (12); two pressure fingers (12) are linked by a segment (12b) with a constituent extending along the axial direction (D1) of the commuter; a guide wheel (13), defined by a hub and a rim, wherein said rim is partially surrounded by the helical spring (12f) and the front shaft (14) is inserted between said hub and the rim; a linking arm (18) assembled on the rear shaft (16) by a flat roller (20), said linking arm (18) having a groove (19) wherein, when the free edge (12g) of the pressure finger (12) is engaged in said groove (19), the pressure finger (12) is kept and formed to press the brush (2) to a partially radial direction towards the commuter with a considerably constant force.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) The disclosure part of the description is based on appropriately prepared figures, expressing preferred embodiment(s) of the product as now presented, by means of sufficiently detailed and consecutive numbers, clarifying aspects which may be realized from the adopted representation, so to determine the protection as claimed. Therefore:

(2) FIG. 1 shows a perspective view of the brush holder for locomotive electric motors, having two cavities for brushes;

(3) FIG. 2 shows an upper view of the brush holder for locomotive electric motors, having two cavities for brushes;

(4) FIG. 3 shows a side view of the brush holder for locomotive electric motors, having two cavities for brushes;

(5) FIG. 4 shows a side cut view of the brush holder for locomotive electric motors, containing two cavities for brushes;

(6) FIG. 5 shows an upper exploded perspective view of the brush holder for locomotive electric motors, containing two cavities for brushes;

(7) FIG. 6 shows a lower exploded perspective view of the brush holder for locomotive electric motors, containing two cavities for brushes;

(8) FIG. 7 shows a perspective view of the spring, which is an integral part of the brush holder for locomotive electric motors, containing two cavities for brushes;

(9) FIG. 1A shows a perspective view of the brush holder for locomotive electric motors, containing three cavities for brushes;

(10) FIG. 2A shows an upper view of the brush holder for locomotive electric motors, containing three cavities for brushes;

(11) FIG. 3A shows a side view of the brush holder for locomotive electric motors, containing three cavities for brushes;

(12) FIG. 4A shows a side cut view of the brush holder for locomotive electric motors, containing three cavities for brushes;

(13) FIG. 5A shows an upper exploded perspective view of the brush holder for locomotive electric motors, containing three cavities for brushes;

(14) FIG. 6A shows a lower exploded perspective view of the brush holder for locomotive electric motors, containing three cavities for brushes;

(15) FIG. 7A shows a perspective view of the spring, which is an integral part of the brush holder for locomotive electric motors, containing three cavities for brushes;

(16) FIG. 1B shows a perspective view of the brush holder for locomotive electric motors, containing one cavity for a brush;

(17) FIG. 2B shows an upper view of the brush holder for locomotive electric motors, having one cavity for a brush;

(18) FIG. 3B shows a side view of the brush holder for locomotive electric motors, containing one cavity for a brush;

(19) FIG. 4B shows a side cut view of the brush holder for locomotive electric motors, containing one cavity for a brush;

(20) FIG. 5B shows an upper exploded perspective view of the brush holder for locomotive electric motors, having one cavity for a brush;

(21) FIG. 6B shows a lower exploded perspective view of the brush holder for locomotive electric motors, having one cavity for a brush; and

(22) FIG. 7B shows a perspective view of the spring, which is an integral part of the brush holder for locomotive electric motors, having one cavity for a brush.

(23) We should highlight that these drawings are merely representative, and may have variations, as long as they do not escape from the initial requirements.

DETAILED DESCRIPTION OF THE INVENTION

(24) As shown by the above listed drawings, the “BRUSH HOLDER FOR ELECTRIC TRACTION MOTORS FOR LOCOMOTIVES”, is conceived as a direct current engine, being used to support, press and support at least one brush (2) on the commuter, wherein said brush holder (1) is constituted by a monoblock base (3), comprising:

(25) at least one linking pin (4) on the rear part of said monoblock base (3), according to the assembly of the brush holder (1) on the structure of the electric motor;

(26) at least one rectangular cavity (6) located at parallel to each other, wherein each one of said cavities is adapted to match a brush (2), which lower edges are projected through the outlet (11) included on the lower edge of said cavities (6);

(27) at least one compliant linking means, so to link at least one brush terminal (10);

(28) at least two pairs of legs (15′, 17′), each one having a guide hole (15, 17) through which each one has a central shaft (D2, D3), which direction is parallel to the commuter rotation shaft (D1);

(29) at least one pressure device, comprising a front shaft (14) and a rear shaft (16), received in the respective guide holes (15, 17), and a front shaft (14) and a rear shaft (16) are able to turn around the respective shaft (D2, D3); and

(30) at least one pressure finger (12), compliant to press the brush (2) on the electric motor commuter.

(31) Said brush holder, object of the present invention, is characterized by each pressure finger comprising:

(32) an appendix (12a) surrounded by a semicircular or flat cable (12c) located at one edge;

(33) a “U”-shaped segment (12d), located on the medium part of the pressure finger (12); a helical spring (12f) connected to said “U”-shaped segment (12d) by a segment (12e) and a free edge (12g) located on the opposite edge of said pressure finger (12);

(34) a guide wheel (13), defined by a hub and a rim, wherein said rim is partially surrounded by the helical spring (12f), and said front axis (14) is inserted between said hub and the rim;

(35) a linking arm (18) assembled on the rear edge (16) by flat rolling (20), said linking arm (18) having a groove (19), wherein, when the free edge (12g) of the pressure finger (12) is fitted to said groove (19), the pressure finger (12) is held and shaped to press the brush (2) to a partially radial direction for the commuter with a considerably constant force.

(36) As an embodiment, the brush holder (1) comprises two pressure fingers (12) per brush (2). In another embodiment, the connection, on the upper portion of the monoblock base (3), is a pair of linking pins (4), surrounded by an isolating material (5).

(37) In another embodiment, the monoblock base (3) has front openings (7), compliant to allow the passage of the pressure finger (12) upon brush tear, besides comprising at least a protrusion (8) designed on the external part of the rectangular recesses (6), being said protrusion intended to link at least one brush terminal (10) by means of a bolt (9).

(38) In another embodiment of the brush holder (1), the cavities (6) have tangential measurements “τ” between 23.00 mm and 28.00 mm and axial dimensions “a” between 40.00 mm and 57.00 mm.

(39) In still another embodiment, the brush holder is used in an electric motor of a railway traction motor, more specifically a diesel train locomotive.

(40) In a second variation, said brush holder (1) is characterized by two pressure fingers (12) being linked by a segment (12b) extending itself along the axial direction of the commuter, wherein a pressure device is used to keep and press at least one brush (2) on the commuter of a direct current motor, when said brush (2) is assembled on a brush holder (1), said pressure device being constituted by:

(41) a front shaft (14) and a rear shaft (16) located along a shaft (D2, D3) parallel to the rotation shaft (D1) of the commuter, being said front shaft (14) and rear shaft (16) received in guide holes (15, 17) located on the brush holder (1);

(42) two pressure fingers (12), compliant to press the brush (2) on the electric motor commuter, wherein each pressure finger (12) comprises an appendix (12a) surrounded by a semicircular or flat cable (12c) being provided on an edge, a “U”-shaped segment (12d), located on the medium portion of the pressure finger (12), a helical spring (12f) linked to said “U”-shaped segment (12d) by a segment (12e) and a free edge (12g) located on the opposite edge of said pressure finger (12);

(43) two pressure fingers (12) are linked by a segment (12b) with a constituent extending along the axial direction (D1) of the commuter;

(44) a guide wheel (13), defined by a hub and a rim, wherein said rim is partially surrounded by the helical spring (12f) and the front shaft (14) is inserted between said hub and the rim; and

(45) a linking arm (18) assembled on the rear shaft (16) by a flat roller (20), said linking arm (18) having a groove (19) wherein, when the free edge (12g) of the pressure finger is engaged to said groove (19), the pressure finger (12) is kept and shaped to press the brush (2) to a partially radial direction towards the commuter with a considerably constant force.

(46) Therefore, the present invention aims to solve the main inconveniences as found in the already existing models, as follows:

(47) increase in the sparking level and thus in maintenance intervals are possible, thanks to the changing slope of the carbon brush, a brush design working at 25° over a radial condition with the commuter, the brush measurements over the tangential coverage ratio being defined by the engine configuration and the existence of a new form of pressure system for the brush to increase its stability over constant pressure; and

(48) use of a pressure spring with a curved shape forming an appendix on its lower portion resting on the upper part of the brush, pressing it inside the brush housing on the brush support, while holding a cable to facilitate brush maintenance and substitution.

(49) By keeping the same isolated pin (4, 5) and considering the available space on the structure of the traction motor, the new brush holders may be installed on the motor structure with no need for any alteration.

(50) We can thus conclude from the above that the “BRUSH HOLDER FOR ELECTRIC TRACTION MOTORS FOR LOCOMOTIVES” is characterized as an improvement having all functional qualities fully justifying the patent application as a Privilege of Invention.

(51) Obviously, it will be realized that, although the above disclosure was presented as an illustrative example, all other modifications and variations performed to this embodiment, as they would be evident for the experts in the art, are considered within the wide scope and reach of this Privilege of Invention, as per the following set of claims.