Generally speaking, the gear refers to a single gear pa […]
Generally speaking, the gear refers to a single gear part. Generally, the gear and the shaft are connected and used in some way, such as spline, shear flat key, etc. In special cases, when the gear is small and the shaft is thick, the general method of connection makes the shaft and the shaft The strength of the gear structure is poor and cannot meet the requirements for use. At this time, the two can be combined into one, which is both a gear and a shaft, which is called a shaft gear, or a gear shaft. The shaft used in some places in the car (such as the rear axle) is 2 half shafts, each of which is a shaft gear, so it is called a half shaft gear or a half gear shaft.
What is a half shaft
Driver Shaft (CVJ, CV joint, constant velocity joint) is a shaft that connects the differential and the drive wheel. The half shaft is a shaft that transfers torque between the gearbox reducer and the drive wheels. Each of the inner and outer ends has a universal joint (U/JOINT) connected to the reducer gear and the hub bearing inner ring through splines on the universal joint. . The half shaft is the shaft that transmits torque between the gearbox reducer and the drive wheels (previously it was mostly solid, but because the unbalanced rotation of the hollow shaft is easier to control, so many cars use hollow shafts), each of which has a The joint (U/JOINT) is connected to the reducer gear and the inner ring of the hub bearing through splines on the universal joint.
Classification of semi-axes
The half-axes commonly used in modern automobiles have two types: full-floating and semi-floating, depending on the type of support. (There are also three types, namely full floating, 3/4 floating, and semi-floating)
1. Full-floating half shaft
Works only withstand torque, and its half shaft that does not bear any force and bending moment at both ends is called a full floating half shaft. The outer flange of the half shaft is fastened to the hub with bolts, and the hub is mounted on the half shaft sleeve through two bearings that are far apart. On the structure, the inner end of the full-floating half shaft is splined, the outer end is flanged, and the flange has a number of holes. Because of its reliable work, it is widely used in commercial vehicles.
2, 3/4 floating half shaft
In addition to the full torque, it must also bear a part of the bending moment. The protruding structural feature of the 3/4 floating half shaft is that there is only one bearing at the outer end of the half shaft, which supports the wheel hub. Due to the poor support stiffness of a bearing, in addition to the torque, this half shaft also has to bear the bending moment caused by the vertical force, driving force and lateral force between the wheel and the road surface. 3/4 floating half shafts are rarely used in automobiles.
3, semi-floating half shaft
The semi-floating half shaft is directly supported on the bearing located in the inner hole of the outer end of the axle housing with a shaft journal near the outer end. The wheel disc and the brake hub are connected. Therefore, in addition to transmitting torque, it also has to withstand the bending moments caused by the vertical force, driving force and lateral force transmitted from the wheels. The semi-floating semi-axle is used in passenger cars and some of the same cars due to its simple structure, small quality and low cost.