CN205130896U - Electric drive rear axle assembly for electric motor car - Google Patents

Abstract

The utility model provides an electric drive rear axle assembly for electric motor car, including rear axle sub -unit, second grade roller gear derailleur, there are not differential mechanism the initiative taper gear, driven bevel gear in the differential mechanism of rear axle sub -unit, passive roller gear of fixed connection on the shell body in the differential mechanism, direct and the passive roller gear meshing of output gear of a second grade roller gear derailleur, second grade roller gear derailleur is through first initiative motor, the supplementary motor drive of second: the wheel hub of rear axle sub -unit goes up fixedly connected with wheel reduction. The utility model discloses an optimize the structure of differential mechanism, the mode output power who adopts cylindrical gearing is to passing the differential mechanism to improve transmission efficiency, the utility model discloses realize the output of big drive ratio, the resultant gear ratio can reach more than 22, adopt two motors to arrange, realize big torque output on the basis that does not increase the power of motor to improve transmission efficiency. First initiative motor, second stand -by motor can the simultaneous workings, also can work independently.

Description

Electric vehicle electric drive back axle assembly

Technical field

The utility model relates to electric automobiles, especially electric vehicle electric drive back axle assembly.

Background technology

In recent years electronlmobil due to its environmental-protecting performance and the development of cheap usage charges rapidly, the back axle manufacture of battery-driven car and demand present fast development trend, two semiaxis that back axle on battery-driven car generally adopts a motor directly to access on diff driving back axle rotate, this back axle is arranged a motor, the use occasion for miniwatt, low moment of torsion can meet the demands substantially; But can not meet the demands on the one hand for the use occasion of superpower, high pulling torque, the moment of torsion transmitted on the other hand and power excessive when motor easily damage.

In recent years, battery-driven car is more and more extensive as the use of goods carrying vehicle, larger power and moment of torsion is needed to export when goods carrying vehicle, for this reason, having occurred the back axle assembly of Dual-motors Driving, is generally that employing two motor reducer assemblies (motor and retarder integrated) access diff and drive two semiaxis on back axle to rotate.

Such as, publication number is that the utility model patent of CN203611711U discloses " Dual-motors Driving motor rear axle ", is exactly to adopt two motor reducer assemblies (motor and retarder integrated) to access diff to drive two semiaxis on back axle to rotate.Although reach the object that larger power and moment of torsion export, 1, its technology realizes than relying on the retarder of motor reducer assembly, total reduction gear ratio is below 10; If want that the reduction ratio by strengthening retarder realizes the increase of total reduction gear ratio, this is unpractical; Because strengthen the reduction ratio of retarder, will certainly strengthen the volume of retarder, the ground Clearance of back axle reduces, and causes back axle to use; 2, when back axle works, two retarders are all in running, and watt loss is large; 3, big speed ratio cannot be realized export.

Current back axle (back axle branch unit) is the General Construction in openly a lot of year: comprise axle housing, the diff of axle housing medium position, two semiaxis, two wheel hubs.

Summary of the invention

The utility model proposes electric vehicle electric drive back axle assembly, adopt two electric-powered source input, realize big speed ratio and export, the basis not increasing power of motor realizes high pulling torque and exports, and improve driving efficiency.

The technical solution of the utility model is as follows: electric vehicle electric drive back axle assembly, comprises back axle branch unit, secondary cylindrical wheel change-speed box, below the diff of back axle branch unit is defined as " diff ", it is characterized in that:

There is no diff drive bevel gear (little basin angle tooth) in diff, by dynamic bevel gear (large basin angle tooth), the body skin in diff be fixedly connected with a passive cylindrical wheel;

Secondary cylindrical wheel change-speed box is directly fixed on the axle housing of back axle branch unit, and the output gear of secondary cylindrical wheel change-speed box directly engages with passive cylindrical wheel;

On back axle, the both sides of secondary cylindrical wheel change-speed box are respectively arranged with the first active motor, the second helper motor: the first initiatively rotating shaft of motor, the rotating shaft of the second helper motor are connected directly between the two ends of the input shaft of secondary gear change-speed box;

The wheel hub of back axle branch unit is fixedly connected with wheel reduction gear.

Further restriction to technique scheme: a described second helper motor genemotor substitutes; Described genemotor is the motor that current collection moves output, electricity generate function is integrated.

Beneficial effect: the utility model, by optimizing the structure of diff, adopts the mode outputting power of spur gear drive to passing diff, thus improves driving efficiency; The utility model adopts secondary cylindrical wheel change-speed box, the combination of wheel reduction gear realizes big speed ratio and exports, and overall gear ratio can reach more than 22, thus significantly can improve moment of torsion output; Adopt two motor arrangements, the basis not increasing power of motor realizes high pulling torque and exports, and improve driving efficiency; On the other hand, in the electronlmobil starting stage, two motors work simultaneously, and electronlmobil is started to walk smoothly; When electronlmobil is walked, can only make a machine operation by vehicle-mounted central control system; After the second helper motor substitutes by genemotor, during electronlmobil walking, can generate electricity to Vehicular accumulator cell and store.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Fig. 2 is fundamental diagram of the present utility model.

Detailed description of the invention

As shown in Figure 1, further describe the utility model as follows: electric vehicle electric drive back axle assembly, comprise back axle branch unit 1, secondary cylindrical wheel change-speed box 4, the following diff back axle branch unit is defined as " diff ", there is no diff drive bevel gear (little basin angle tooth) in diff 101, by dynamic bevel gear (large basin angle tooth), the body skin in diff be fixedly connected with a passive cylindrical wheel 6;

Secondary cylindrical wheel change-speed box 4 is directly fixed on the axle housing of back axle branch unit 1, and the output gear 402 of secondary cylindrical wheel change-speed box directly engages with passive cylindrical wheel 6;

The two ends that the both sides of secondary cylindrical wheel change-speed box are respectively arranged with the first initiatively motor 3, second helper motor 5: the first initiatively rotating shaft of motor 3 on back axle, the rotating shaft of the second helper motor 5 is connected directly between the input shaft 401 of secondary gear change-speed box; The wheel hub 103 of back axle branch unit is fixedly connected with wheel reduction gear 2.

As shown in Figure 1, the inner side of wheel hub 103 is provided with drg 104, and he is also a part for back axle branch unit 1.

The second helper motor 5 shown in Fig. 1 can substitute by a genemotor; Described genemotor is the motor that current collection moves output, electricity generate function is integrated, and can realize transmission like this, or generating stores to Vehicular accumulator cell.

As shown in Figure 2, principle of work of the present utility model: the first active motor 3, second helper motor 5 inputs to secondary cylindrical wheel change-speed box 4(by secondary cylinder retarder power and is directly fixed on the axle housing of back axle branch unit), then by semiaxis 102, wheel reduction gear 2 to wheel A.

Claims (2)

1. electric vehicle electric drive back axle assembly, comprises back axle branch unit, secondary cylindrical wheel change-speed box, below the diff of back axle branch unit is defined as " diff ", it is characterized in that:

There is no diff drive bevel gear in diff, by dynamic bevel gear, the body skin in diff be fixedly connected with a passive cylindrical wheel;

Secondary cylindrical wheel change-speed box is directly fixed on the axle housing of back axle branch unit, and the output gear of secondary cylindrical wheel change-speed box directly engages with passive cylindrical wheel;

On back axle, the both sides of secondary cylindrical wheel change-speed box are respectively arranged with the first active motor, the second helper motor: the first initiatively rotating shaft of motor, the rotating shaft of the second helper motor are connected directly between the two ends of the input shaft of secondary gear change-speed box;

The wheel hub of back axle branch unit is fixedly connected with wheel reduction gear.

2. electric vehicle electric drive back axle assembly according to claim 1, is characterized in that: a described second helper motor genemotor substitutes.