Xingtai far auto parts manufacturing Co., Ltd.
Xingtai Yuantuo Auto Parts Manufacturing CO., Ltd was founded in 1990,which is a company specialized in center support bearing and torque rod bush in Northern China. It covers an area of 30,000 square meters.
The automobile transmission system is located between the engine and the driving wheel, which can make the power characteristics of the engine output suitable for the needs of automobile driving under various working conditions, so that the automobile can run normally. The most common is the mechanical transmission system, hydraulic machinery transmission system for large buses, senior cars and all kinds of engineering vehicles. Electric drives are rare and are only used in large mine vehicles. It is mainly composed of clutch, transmission, universal transmission device and drive axle. In off-road vehicles, it also has a sub-brake. Responsible for distributing transmission power back to each drive axle.
The structural characteristics of the main assemblies
The clutch is located between the engine flywheel and transmission. The driving part is fixed on the rear end face of the flywheel, the driven part is located between the flywheel and the pressure plate, and is connected with the first shaft of the transmission through the spline hole in the center. The pressing part is located between the pressure plate and the clutch cover, and the friction plate is tightly clamps between the flywheel and the pressure plate by its elastic force. The main and slave parts use the friction torque to transfer the torque output by the engine. The separation mechanism is composed of a separation lever mounted on the clutch cover and the pressure plate, a separation bearing mounted on the sleeve of the bearing cover of the first shaft of the transmission and a separation fork mounted on the flywheel housing. The separation fork is mechanically or hydraulically connected to the clutch pedal in the cockpit. The clutch is often engaged to transfer torque, only when the clutch pedal is stepped on, the separation mechanism will move the pressure plate back and separate the friction plate and present the separation state. At this time, torque transmission is interrupted, and operations such as starting, shifting, braking and so on can be carried out. When the car driveline overload, the clutch will start to slip, the transmission to achieve overload protection. The friction plate is also provided with a torque shock absorber to make the transmission work more stable. The clutch pressing part of the traditional structure mostly adopts a circle of spiral spring distributed uniformly around the circumference. In addition to the clutch when more laborious, elastic is not easy to uniform. There are also disadvantages such as large axial size and decreasing compression force at high speed, which are gradually replaced by diaphragm clutch. Diaphragm clutches use a dish-shaped diaphragm spring instead of a coiled spring and a disengaging lever, which not only reduces the axial ruler, but is also easy to handle and reliably compacts under all conditions. The operation mechanism of the clutch refers to the transmission part between the clutch pedal and the separation fork. Most cars are mechanically built, connected to each other by a pull rod or wire rope. There are also some vehicles that use hydraulic mechanisms, which connect the two with a hydraulic transmission.
In the car running, the variation range of the required driving force is very large, but the variation range of the engine output torque is limited. The transmission must be used to make the engine output torque range to meet the needs of the vehicle running. At the same time, the transmission should also be able to achieve the car reversing and engine idling. At present, mechanical grade transmission is used in automobiles, which is composed of variable speed transmission mechanism and variable speed control mechanism. Generally with 3 ~ 6 forward gear and 1 reverse gear. Each gear has a gear ratio, which can increase the engine output torque to the same multiple as the gear ratio. At the same time, reduce the engine speed to the same multiple as the transmission ratio. The lower the gear, the greater the transmission ratio.
III. Universal transmission device:
The universal transmission device is mainly composed of the universal joint and the transmission shaft, which transmits the power from the transmission or the sub-brake to the drive axle.
IV. Main Reducer:
Used to further increase the torque output of the transmission, and further reduce the speed. For a longitudinal engine, the rotation plane is also rotated by 90 degrees to be parallel to the wheel plane.
The differential set on the drive axle can allow the speed of both driving wheels to be out of sync when necessary, so as to meet the needs of car steering and irregular road driving.
The inner end of each half shaft is connected with the half shaft gear through a spline, and the outer end is connected with the wheel hub machine.
7. Axle housing and hub:
The axle housing forms the housing of the drive axle. The hub is the part of the wheel through which the wheel is mounted on the drive axle.
Drive shaft in the role of auto parts is still very powerful, not to be underestimated. In the engine front rear wheel drive (or all-wheel drive) car, due to the car in the process of movement of suspension deformation, the drive shaft main reducer input shaft and transmission (or transfer box) between the output shaft often have relative movement. The quality of the drive shaft directly affects the safety of the car. The quality inspection of drive shaft forgings generally includes three aspects: one is dimensional accuracy; Second, surface roughness; Third, shape and position accuracy.
(1) the measurement of the dimensional accuracy of shaft parts for the drive shaft, the dimensional accuracy is high, is not complex, except for the screw thread, with general measuring means can be completed. The main measuring tools are vernier calipers, screw micrometers, thread micrometers or thread plug gauges.
(2) surface roughness measurement parts surface roughness requirements are high, with the surface roughness measuring instrument for measurement, and forgings surface roughness requirements are not high, such as KA0.4 below, with the surface roughness contrast sample.
(3) shape and position accuracy measurement shape and position accuracy measurement is the most important in machining, but also the most difficult, some can not rely on the instrument to measure, the need for auxiliary tools. To understand how shape and position accuracy are measured, it is important to know what indicators of shape accuracy and position accuracy are available. The shape precision of mechanical parts mainly refers to the requirements of a single element, and has nothing to do with other points, lines and planes, such as straightness, roundness, flatness and cylindricity. The position accuracy of mechanical parts mainly refers to the relationship between two and more than two kinds of elements, such as parallelism, verticality, inclination, position, coaxiality, symmetry, circular runout, total runout eight kinds. There are two kinds of requirements that can refer to a single element or a variety of elements, such as line profile and surface profile, etc.
The circular runout of each surface is the main requirement of shaft shape and position accuracy. Measurement, a kind of method is at the center of the forgings at the ends of the hole in the deflection gauge on the top of the dial indicator (high precision with a dial gauge) of the probe and the workpiece measurement of surface contact, (two points, should pay attention to is the probe and the workpiece measuring vertical surface, the other point, the amount of precompression probe not too much, usually around 0.2 _). In the absence of a yaw meter can be used in the second method, that is, the use of the lathe for machining the two centers for measurement, the measurement method is similar to the first.
Steyr series of heavy duty trucks according to the different drive form to choose different types of transmission shaft. Generally speaking, a 4×2 drive car has only one main drive shaft. The 6×4 transmission type car consists of a middle drive shaft, a main drive shaft and a middle and rear axle drive shaft. The 6×6 drive type car not only has the middle drive shaft, the main drive shaft and the middle and rear axle drive shaft, but also has the front axle drive shaft. The intermediate drive shaft of a long wheelbase vehicle is generally provided with the intermediate support of the drive shaft. It is composed of a support frame, a bearing and a rubber bearing.
The drive shaft is composed of a shaft tube, a telescopic sleeve and a universal joint. The telescopic sleeve can automatically adjust the distance between the transmission and the drive axle. The universal joint ensures the change of the Angle between the transmission output shaft and the drive axle shaft, and realizes the constant angular speed transmission of the two shafts. Universal joint cross shafts, cross shafts and flange forks, etc. The universal joint of the transmission shaft used by the steyr series heavy vehicles adopts the roller cross shaft bearing, matched with the short and thick cross shaft, which can deliver a greater rotation distance. The end face of the bearing is provided with butterfly spring for tightening the roller. A reinforced nylon gasket with spiral grooves is added to the end face of the cross shaft to prevent sintering during power transfer at large angles or large rotation distances.
The traditional structure of the transmission shaft telescopic sleeve is to weld the spline sleeve and flange fork together, and the spline shaft is welded on the transmission shaft tube. GWB's drive shaft has changed the traditional structure, welding the spline sleeve and drive shaft tube as one, spline shaft and flange bifurcated as one. The rectangular spline is replaced by involute short tooth spline with high pressure Angle, which not only improves the strength, but also facilitates extrusion forming, and meets the needs of high torque working conditions. The tooth surface of the telescopic sleeve and spline shaft is coated with a layer of nylon, which not only increases the wear resistance and self-lubrication, but also reduces the damage of the impact load on the transmission shaft, and improves the buffer capacity.
This type of drive shaft in the flanged spline shaft outside the increase of a tubular sealing protective sleeve, in the end of the protective sleeve is provided with two polyurethane rubber oil seal, so that the retractable sleeve formed a completely sealed factory space, so that the retractable spline shaft is not corroded by external sand and dust. Not only dust, but also rust. Therefore, spline shaft and sleeve in the assembly process of one-time smear grease, can fully meet the use requirements, do not need to install nozzle lubrication, reduce the maintenance content.
The drive shaft is a rotating body with high speed and little support, and its dynamic balance is very important. Under normal circumstances, the drive shaft must pass the dynamic balance test before leaving the factory, and be adjusted on the balancing machine. Therefore, a set of drive shafts shipped from the factory should be paid special attention to in use.