汽车新能源与节能技术

汽车新能源与节能技术
Design of driving axle
As the car to safety, energy saving, the constant attention to environmental protection, vehicle afte r vehicle bridge as a key component, the quality of their products on the safe use of cars and car perfor mance of a very large, so the car after Bridge Effectively optimize the design and calculation is very nece ssary.
Drive Bridge at the end of powertrain, its basic function is to increase came from the drive shaft or transmission of torque and power reasonably allocated to the left and right driving wheel and also bear in the role of the road and trailers or Body of power between the vertical and horizontal force. Drive fro m the main bridge general reducer, differential and the wheels, transmission and drive axle components , such as Shell. Bridge drive a vehicle with one of the four trains, its performance will have a direct impa ct on vehicle performance, and it is particularly important for the truck. Drive bridge should be designe d to meet the following basic requirements:
a) a suitable main slowdown than to ensure that the car from the best power and fuel economy.
b) small form factor to ensure that the necessary ground clearance. c) transmission gears and other par ts of a smooth, noise.
d) in various load and speed of transmission with high efficiency.
e) to ensure adequate strength, stiffness conditions, should strive for the quality of small, in particular t he quality of the spring as possible, to improve the car ride. f) suspension and body-oriented movemen t coordination, the drive to the bridge, should also be coordinated with the campaign steering mechanis m.
g) simple structure, processing technology and good, easy to manufacture, enables easy adjustment.. Intelligent electronic technology in the bus to promote safe driving and that the other functions. The re alization of automatic driving through various sensors. Except some smart cars equipped with multiple outside sensors can fully perception of information and traffic facilities and to judge whether the vehicl es and drivers in danger, has the independent pathfinding, navigation, avoid bump, no parking fees etc. Function. Effectively improve the safe transport of manipulation, reduce the pilot fatigue,improve passe nger comfort. Of course battery electric vehicle is the key, the electric car battery mainly has: the use of lead-acid batteries, nickel cadmium battery, the battery, sodium sulfide sodium sulfide lithium battery, t he battery, the battery, the flywheel zinc - air fuel cell and solar battery, the battery. In many kind of cell s, the fuel cell is by far the most want to solve the problem of energy shortage car. Fuel cells have high p ollution characteristics, different from other battery, the battery, need not only external constantly supp ly of fuel and electricity can continuously steadily. Fuel cell vehicles (FCEV) can be matched with the car engine performance and fuel economy and emission in the aspects of superior internal-combustion veh icles.
Keyword: drive axle differential bridge reducer Bridge shell
This is an ANSYS optimum design for driving axle housing of a off-road vehicle. Firstly, the author establi shed a three-dimensional model of the driving axle. States of stress in different working conditions were analyzed. Furthermore, the maximum pressure of driving axle was achieved.
And then, the three-dimensional model was imported into ANSYS, with some other manipulations, such as meshing, adding degree of freedom, applying surface loads, etc.
States of stress of driving axle were calculated with the results exported. Finally, this paper carried out t he optimum design according to the target of minimizing the qualitative properties and homogenizing t he distribution of stresses. Confirmatory analysis showed that this design measured up to the engineering requirement.
This invention relates generally to a powertrain for a vehicle, and, more particularly, to a powertrai n having multiple power sources including an electric motor for driving a set of vehicle wheels.Hybrid el ectric powertrains have been developed that include an electric motor and an internal combustion (IC) engine, which can operate independently or in combination depending on the driving conditions, the state of charge of a traction battery, and the power source that most efficiently meets the current powe r demands imposed by the vehicle operator.Mostelectric hybrid vehicles available commercially are fron t wheel drive vehicles, in which only the front wheels are driven. Hybrid electric powertrains being deve loped for use in four-wheel drive vehicles allow both the motor and engine to transmit power to a rear s et of driven wheels.When packaging an electric motor drive unit for a rear axle it is preferable to use a l ay shaft power flow such that the motor drive unit is placed on the rear axle centerline. Such electric hy brid drive systems, however, present packaging difficulties to the vehicle designer, particularly when lay shaft gearing is used to transmit power from a longitudinal drive shaft to a rear axle.A need exists for a hybrid electric powertrain in which one axle is driven by an electric motor or an IC engine in combinatio n with the motor. To minimize cost, an electric machine would provide all hybrid functions including ele ctric energy generation, electric vehicle launch, engine starting, electric boosting of engine power, and r egenerative braking. A drive unit for a hybrid electric motor
vehicle includes an engine, an electric mach ine including a rotor, a layshaft gearset including an input driveably connected to the engine and an out put, for transmitting power between the input and the output and producing a first speed differential t hat causes a speed of the input to exceed a speed of the output, first and second driveshafts,a different ial mechanism driveably connected to said output, for transmitting power between said output and the driveshafts, and a planetary gear unit driveably connected to the output and the rotor, for transmitting power between said rotor and said output and producing a second speed differential that causes a spee d of the rotor to exceed the speed of the output.A torque reaction for the speed reduction planetary ge aring is provided on a housing through a bore of a shaft or drum rather than through an outer diameter of the housing, thereby simplifying the bearing support requirements and allowing compact positionin g of the mechanical drive elements. Use of planetary gearing to reduce the speed of elements driven by the electric machine in the electric only drive path reduces the size of the package space required for th e drive unit. The scope of applicability of the preferred embodiment will become apparent from the foll owing detailed description, claims and drawings. It should be understood, that the description and spec ific examples, are given by way of illustration only.Various changes and modifications to
the described embodiments and examples will become apparent to those skilled in the art.
MACHINABILITY
The machinability of a material usually defined in terms of four factors:
1、 Surface finish and integrity of the machined part;
2、 Tool life obtained;
3、 Force and power requirements;
4、Chip control.
Thus, good machinability good surface finish and integrity, long tool life, and low force And power r equirements. As for chip control, long and thin (stringy) cured chips, if not broken up, can severely interf ere with the cutting operation by becoming entangled in the cutting zone.。