CN2654421Y

CN2654421Y - Shaft terminal contact type earthing device

Info

Publication number: CN2654421Y
Application number: CN 200320114182
Authority: CN
Inventors: 陈清理; 唐飒君; 蔡耀成
Original assignee: XIANGTAN LIYUAN ELECTRIC TOOLING CO Ltd
Current assignee: XIANGTAN LIYUAN ELECTRIC TOOLING CO Ltd
Priority date: 2003-11-24
Filing date: 2003-11-24
Publication date: 2004-11-10
Anticipated expiration: 2013-11-24

Abstract

The utility model discloses a shaft tip contact type earthing device of electric automobile in city, comprising a cover (1), an obturating ring (rubber sheet) (2), a constant force spring (3), a brush box (4), a plurality of brush yokes (5), a plurality of brushes (6), a current-conducting plate (7), an obturating ring (felt) (8), a connector (9), a current-conducting rod (10) and an insulated sleeve (11), and is characterized in that n groups of brushes (6) and brush yokes (5) are connected into a whole and the n groups of brushes (6) are homogeneously distributed in the brush yokes (5) and on the head face of the current-conducting plate (7) which is connected with an axle (12); the n groups of brushes (6) are arranged in parallel with the brush yokes (5). The utility model has a better performance than the radial contact type earthing device, and has the advantages of simple maintenance, convenient usage and reliable contact with the earth.

Description

Axle head contact earth system

Technical field:

The utility model relates to a kind of earth system, specifically, is a kind of earth system of urban track traffic elec. vehicle.

Background technology:

At present, the main circuit current of light rail electrical car and subway electrobus all is by pantagraph current collector power network current to be introduced the vehicle convertor equipment, after power transmission system, flow into earth system, again by wheel shaft and wheel to flowing into rail return current to the power station.The effect of earth system can be avoided the electrocorrosion of electric current to wheel set bearing, guarantees the safe operation of elec. vehicle.Current most earth system all adopts the radially way of contact with respect to main shaft.This earth system is simple in structure, but has following several problems:

1) require the installation site and the center size of axle to fix;

2) owing to shaft runout, the position of causing carbon brush and axle increases contact resistance to changing, the deterioration of water conservancy diversion effect;

3) carbon brush upper spring pressure is not the mating surfaces of vertical carbon brush and axle, easily makes carbon brush not be very even with contacting of axle, causes local overheating.

As the urban passenger vehicle, because stop spacing is short, speed is fast, and is also more and more higher to the requirement of earth system, originally radially the earth system of contact fails to satisfy requirements.

The utility model content

The purpose of this utility model is to provide a kind of ground connection reliable for effect, and stable performance is easy to the urban track traffic electric vehicles axle head contact earth system of changing, keeping in repair.

The purpose of this utility model is such realization:

Its structure mainly is made up of parts such as lid, seal ring (rubber plate), constant tension spring, brush box, brush holder, brush, conductive plate, seal ring (felt), connector, conducting rod, insulating tubes.

1) adopts the shaft end type way of contact, and n organized brush and brush holder mechanism connection one, the brush that is contained in the brush holder is distributed on the conductive plate end face that links to each other with wheel shaft, the in parallel use of n group brush, (braid connection that is about to n group brush is all received on the brush holder, electric current is guided to brush holder by conducting rod) improved the current capacity of device and the area of contact of brush and conductive plate, reduced contact resistance.

2) n group brush in parallel is uniform near the center of conductive plate, and the radius of rotation of its contact position is little, and then under the identical condition of wheel shaft rotating speed, its circumferential velocity v reduces, and therefore can reduce mechanical wear, prolongs the service life of brush.Also corresponding the reducing of mechanical wear that produces on conductive plate simultaneously reduced the requirement of the suitable Modern High-Speed vehicle of maintenance load.

3) constant tension spring is made up of scroll spring steel band and supporter.

4) by adopting the axle box insulation of adopting insulation sleeve to make earth system between insulating washer and insulating tube and conducting rod and brush box and installing and fixing between brush holder and the brush box, flow into bearing to prevent ground current.

5) connector of conductive plate and wheel shaft is made the T type and is opened two annular sulculuses in the end, and the seal ring of embedded immersion oil can prevent that the axle box lubricating oil from flowing into the stained contact surface of brush box and influencing contact, causes earthing failure.

Description of drawings

Fig. 1 the utility model one embodiment front view;

Fig. 2 is Fig. 1 embodiment A-A cutaway view;

Fig. 3 is Fig. 1 Embodiment B-B cutaway view.

Among the figure, lid 1, rubber seal 2, constant tension spring 3, brush box 4, brush holder 5, brush 6, conductive plate 7, seal ring felt 8, connector 9, conducting rod 10, insulating tube 11.

The specific embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

With reference to accompanying drawing, Fig. 1, Fig. 2, Fig. 3 be with lid 1 seal ring 2 usefulness Bolt Connection on brush box 4, can prevent effectively that rainwater and dust from entering brush box 4.Brush box 4 be the strut member of brush holder 5 be again the connector of device and wheel shaft 12.Brush 6 is placed in the brush holder 5, under the effect of constant tension spring 3, and brush play neatly in brush box, and remain under the worn-down situation and still can closely contact with conductive plate 7 with constant pressure.Connector 9 is transition pieces of conductive plate 7 and wheel shaft 12, and an end connects with conductive plate 7, and the other end links to each other with wheel shaft 12.Conducting rod 10 is guided to main circuit current in the brush box, passes to wheel shaft 12 by brush, conductive plate, connector, again by wheel shaft 12 electric current through wheel to introducing rail return current to substation.Insulating tube 11 makes conducting rod 7 and brush box 4 insulation.

This device adopts the way of contact of shaft end type, and n organized brush 6 and brush holder 5 mechanisms connection one, the brush 6 that is contained in the brush holder 5 is distributed on conductive plate 7 end faces that link to each other with wheel shaft 12, n group brush 6 in parallel uses, (braid connection that is about to n group brush is all received on the brush holder, electric current is guided to brush holder by conducting rod) improved the current capacity of device and the area of contact of brush and conductive plate, reduced contact resistance.

N group brush 6 in parallel is uniform near the center of conductive plate 7, and the rotation of its contact position half is decreased, and prolongs the service life of brush.Also corresponding the reducing of mechanical wear that produces on conductive plate 7 reduced the requirement of the suitable Modern High-Speed vehicle of maintenance load simultaneously.

Constant tension spring 3 is made up of scroll spring steel band and supporter.Constant tension spring 3 is fixed in the brush holder 5 by supporter, spring pressure can guarantee to be added in brush 6 surfaces on brush 6 pressure is constant, make brush 6 reliable with contacting of conductive plate 7, it is constant that contact resistance keeps, help the uniform of electric current, avoided wheel shaft 12 fully because the heating phenomenon that the electric current maldistribution causes.

By between brush holder 5 and brush box 4, adopting 4 of insulating washer 13 and insulating tube 14 and conducting rod 10 and brush boxs to adopt insulation sleeve 11 to make earth system and the axle box insulation that installs and fixes, flow into bearing to prevent ground current.

Conductive plate 7 is made the T type and is opened two annular sulculuses in the end with the connector 9 of wheel shaft 12, and the seal ring 8 of embedded immersion oil can prevent that the axle box lubricating oil from flowing into brush box 4 stained contact surfaces and influencing contact, causes earthing failure.

The performance of this device is better than the earth system that radially contacts greatly.It safeguards simple, and easy to use, ground connection is reliable.

Claims

1. axle head contact earth system, mainly form by lid (1), seal ring (rubber plate) (2), constant tension spring (3), brush box (4), brush holder (5), brush (6), conductive plate (7), seal ring (felt) (8), connector (9), conducting rod (10), insulating tube parts such as (11), it is characterized in that n is organized brush (6) to be joined together with brush holder (5) mechanism, n group brush (6) is evenly distributed in the brush holder (5) and on the end face of the conductive plate (7) that links to each other with wheel shaft (12), n group brush (6) is installed in parallel on the brush holder (5).

2. axle head contact earth system according to claim 1 is characterized in that n group brush (6) adopts three groups of brushes (6).

3. axle head contact earth system according to claim 1 is characterized in that constant tension spring (3) is fixed in the brush holder (5), and spring pressure is on brush (6).

4. axle head contact earth system according to claim 1 is characterized in that insulating with insulating washer (13) and insulating tube (14) between brush holder (5) and the brush box (4), insulate with insulation sleeve (11) between conducting rod (10) and brush box (4).

5. axle head contact earth system according to claim 1, the connector (9) that it is characterized in that conductive plate (7) and wheel shaft (12) are made the T type and are opened two annular sulculuses, the seal ring of embedded immersion oil (8) in the end.