- 贝贝
-
* 回复内容中包含的链接未经审核,可能存在风险,暂不予完整展示!Motor
vehicle suspension on the vehicle suspension system is a very important system.
Not only does it affect the comfort of the car (ride), but also to other
properties such as the adoption, as well as the stability of the attachment
have a significant impact on performance, each of the suspension by the elastic
components (buffers), body-oriented (from Chuan And stabilizing role), as well
as shock absorbers (from the role of shock absorption). However, not all of the
suspension must have three components. As long as we can play to the role of
the three.
Vehiclemaintenance for the conservation network 1, flying the classification
1.
Non-independent suspension: on both sides of the wheel mounted on a
total-vehicle-bridge, the train-bridge to fly through the frame and connected.
This suspension structure is simple and reliable power-but by two rounds of
shock and vibration affecting each other. But also because of the quality of
flying non-serious suspension of the poor performance of the buffer, the vibration
of a moving car, the greater the impact. The suspension generally used for
trucks, buses and a number of other ordinary vehicles. (2) independent
suspension: each individual through a set of wheels mounted on the body or
suspension of vehicular bridge, the use of off-Axle, in the middle of a fixed
frame or body; such wheel on both sides of the suspension by the shock
Hubuyingxiang, but due to non-flying than by the quality; buffer with a strong
shock absorption capacity, ride comfort. The indicators are better than
non-independent suspension, but the complex structure of the suspension, but it
also drive axle, steering system has become complicated. The use of such
suspension of the following two categories of vehicles. Cars, buses and
passenger vehicles. Can be improved ride comfort, and high speed when driving
the car to improve stability.
Off-road vehicles, military vehicles and
mining vehicles. In a bad way and have no say under the circumstances, we can
make sure all the wheels on the ground and contacts to enhance stability and
driving the car attached, to play a speed of the car.
2.Flexible
yuan for the type of (1) of the leaf spring: the long-range multi-chip and
curvature ranging from the composite plate. After installed at both ends of the
natural upward curve. In addition to the leaf spring with a buffer, there is a
certain degree of shock absorption, vertical layout also has a force-oriented,
non-independent suspension using most of the leaf spring so flexible
components, save-oriented devices and shock absorbers, simple structure . (2)
of the coil spring: only a cushion for the multi-car independent suspension. In
the absence of damping force and mass functions must also be equipped with
special shock absorbers and device-oriented. (3) oil and gas spring: a flexible
medium as a gas, liquid as a medium-power, which not only has a good buffer
capacity, also has a role in shock absorption and at the same time frame of a
high degree of regulation may also be applicable to the use of heavy vehicles and
buses. (4), torsion bar springs; will be made under the torsion bar springs
fixed at one end of the frame, on the other side through the arm and connected
to the wheels, and beat at wheel torsion bar the use of reverse deformation
played the role of buffer, is suitable for independent The use of suspension.
3.
the use of shock absorber tube shock absorbers, the use of oil in the small
role to cut energy consumption vibration. Shock absorber and the upper body
frame or connected with the lower end of the train-bridge connected. Most of
the trip can be done and the compression of the dual role of the role of shock
absorber.
4.device-oriented:
the flexibility in the independent suspension components, most of them can only
transfer the vertical loads and can not transmit vertical and horizontal, must
be a separate device-oriented. As noted, under the arm and vertical, horizontal
stabilizer, and so on.
5.
non-independent suspension: before and after the truckswere non-independent
suspension bridge, some vehicles such as buses and cars and so on, after the
bridge is also a non-independent suspension. Each car of the sedan chair by
hoisting two independent non-vertical arrangement of the composition of the
leaf spring. Leaf spring fixed in the middle of the train-bridge, with the
front end hinged frame or body, the back-end with the frame or body through the
ear hanging hinged or connected to use of skateboards. Top of the frame with a
shock absorber then, with the lower end of the next school Axle. The truck rear
axle and more without shock absorbers.
6.
many types of independent suspension, coil spring as the use of flexible
components. Torsion bar springs for the independent suspension is also divided
into vertical and horizontal torsion torque Cup two-under. Although many of the
advantages of an independent suspension, but the car would turn the system, the
Department of driving and driving more complicated structure of the bridge.
Keywords:
structure of the engine engine performance merits of a direct impact on the
performance of motor vehicles.
First, the use of fuel by the different
categories according to engine fuel, gasoline engine and the engine is divided
into two major categories of diesel engines.
1
.network Motor conservation maintenance, gasoline engine small size, light
weight, low prices; good start, when the maximum power of high-speed;work in a
small vibration and noise; suitable for small and medium-sized car in
particular, the use of high-speed car.Gasoline deflagration due to the restrictions
can not be too high compression ratio, thermal efficiency and economy are not,
such as diesel. Gasoline is a mixture of the main gas pipeline in the form over
into the cylinder, compressed by the end of close to the spark plugs fire. The
driver to speed up the adoption of the control pedal into the cylinder of the
gas mixture to control the load on the engine, known as the volume of
regulation. Gasoline engine"s fuel supply system and ignition system is a gasoline engine
failure on the part of a higher proportion. Gasoline engine emissions of
harmful material composition of carbon monoxide, carbon compounds and nitrogen
oxides than diesel, and so on, but with the current electronically controlled
fuel injection system and other exhaust gas purification devices, which have
greatly improved. In addition, the gasoline engine"s
torque characteristics are very suitable for automotive use, can significantly
reduce the labor intensity of the driver.
2.
diesel and gasoline engine, diesel engine size, weight, high prices, poor start
(especially when the low temperature); work more vibration and noise; easy to
overload when the black smoke. Diesel is characterized by:
1)
the absence of the deflagration, as well as restrictions on the needs of the
spontaneous combustion of diesel, diesel engine compression ratio high. Thermal
efficiency and economy must be better than the gasoline engine.
2)
the same power, the diesel engine"s torque, maximum power at the time of low speed, suitable for the
use of the truck.
3)
is a mixture of diesel engine cylinder internal form, no inlet throttle, the
intake of small resistance. The driver to speed up the adoption of fuel
injection control board, to change the engine load, known as the regulation of
quality, as there is no problem of hypoxia, emissions of hydrocarbons and
carbon monoxide content of less than gasoline.
4)
In the absence of the ignition system, as well as fuel supply device failure
rate low. Therefore, failure to less than diesel gasoline engine.
5)
diesel engine torque characteristics are not suitable for car driving cycle
needs, moving the stalls to use frequently, an increase of pilot labor
intensity. The main diesel engine for use in medium and heavy vehicles.
Second, the number of engine cylinder and
arrangement of the engine cylinder displacement equal to the volume of work
and.
Increase
in the number of cylinder engine will not only increase capacity, improve the
engine output power, but also to enable the smooth operation of the engine to
reduce noise and vibration. Hyundai Motor have adopted multi-cylinder engine.
Mini-car for more than 3-cylinder engine, small trucks, passenger cars and
medium-sized following for more than 4-cylinder engine; medium-sized trucks,
large cars and buses for more than 6-cylinder engine; Heavy-Duty Truck General
of 6-8 cylinder. 6-cylinder engine under a single row multi-cylinder in-line
mode; 8-cylinder V-type engines for alignment; some of the cars in order to
reduce engine height, length shortened, using V6, V8-type arrangement. Mini-car
use of 3-cylinder engine, most oblique way. In-line engine structure is simple
and cheap. The disadvantage is that a high degree of the engine higher longer
length.Is more a way. V-type engines with low height, short length, but the
structure of the complex, more expensive price, suitable for large-scale
engine. Water-cooled engine block using the whole cast. Small engines used
aluminum alloy materials, large-scale multi-engine for the cast iron. Cylinder
head bolts used in a fixed block on the plane, in addition to constitute a
closed cylinder combustion room, into the exhaust, valves are installed, and
spark plug valve, and so on.
Third,
the gasoline engine"s
fuel supply 1, the fuel-supply system carburetor gasoline engine fuel supply
line into carburetor and fuel-injection two major categories of carburetor main
oil installations operating principle is:
the work of the engine when the outside air In
the cylinder under the suction air filter to filter through into the cylinder.
When the air flow through the pipe section due to the smaller increase in the
velocity and pressure led to the decline in a certain vacuum. Float on the
interior of gasoline in the vacuum from the role of the main inlet into the
spray nozzle, the gas emitted by high-speed air currents disperse into mist,
known as fogging. And then to oil and oil-film evaporation space in the form of
evaporation, and the airway had mixed into the air mixture into the cylinder.
In order to achieve the economy, the main oil loading also uses the air brake.
The main nozzle at the indoor air, and along with a few scheduled to open
around the through-hole and air the same room. When the throttle opening
gradually increases, the air hole gradually connected with the air. Not only
reduces the vacuum so that the mixture-thinning, the main air nozzle is also
beneficial to the atomization of gasoline. 2. electronically controlled fuel
injection fuel-supply system carburetor fuel-supply device structure is simple,
reliable, cheap, easy maintenance. But the biggest drawback is that it can not
be precisely controlled mixture of concentration, resulting in incomplete
combustion, emissions of harmful ingredients, do not meet the stringent
requirements of environmental protection today. In addition, due to the
existence of the pipe so that the air resistance increases. There is also the
cylinder uneven distribution of gasoline and easy to produce and Qizu ice and
so on. In order to solve these problems, 80 electronically controlled fuel
injection system in the car engine on a wide range of applications more and
more.
electronically
controlled fuel injection system advantages: electronically controlled fuel
injection system (referred to as English EFI) has the following advantages:
1.
no matter under what conditions and in what conditions the engine can
accurately control the mixture of concentration, To make gasoline burn
completely full. This greatly reduces the emission of harmful components of
content, also has an excellent combustion engine of the economy.
2.
can supply, ignition temperature, such as centralized control, so that the work
of the engine performance, increased engine power output, lower fuel
consumption.
3.
the engine can always operate in a stable condition in a variety of conditions
so that all car drivers in accordance with the requirements of normal traffic.
4. In the absence of pipes, a small air
resistance. At the same time, difficult to produce Qizu, to the distribution of
gas cylinder uniform, and so on. The shortcomings of the fuel injection system
is the high cost structure of the complex and difficult to repair, and so on.
electronicallycontrolled fuel injection system of classification:
1) by way of testing the air quality into theway traffic density and speed of the way the two categories.
2) by way of fuel injection, the following two
categories. According to the location of the jet, into intake manifold junction
(SPI) and the jet intake manifold Department (MPI) are two jet, respectively,
also known as single-point and multi-point injection jet.
MPI is
current- 慧慧
-
很高兴你向我求助提问这个题,我之前帮别人找过的关于发动机的许多英文文献,我发给你,十来篇吧,也不是很多,主要关键词为mobile engine,不过没有英语翻译,一般而言由于这些论文都是高质量的都是没有现成翻译的,因为毕业论文,自己翻译下也好,这样出来的论文也更有说服力些。
已经发到你邮箱,注意查收下。如果觉得好,不要忘记了采纳哦。