How to analyze the constant angular velocity transmission of the input shaft of the cross shaft universal joint
Time: 2018-04-15 Browse:
1. The universal coupling forks at both ends of the drive shaft are in the same plane;
2. The angle α1 between the two shafts of the first universal joint is equal to the angle α2 between the two shafts of the second universal joint.Because when driving, the drive axle has to jump relative to the transmission, it is impossible to have α1=α2 at any time. In fact, it can only achieve approximately constant speed transmission from the transmission to the drive axle.In the above transmission device, the larger the angle of intersection α between the shafts, the more uneven the rotation of the transmission shaft, the greater the additional alternating load, the more disadvantageous the service life of the parts, and the lower the transmission efficiency, so in the overall arrangement The angle of intersection between these axes should be minimized.
3. Quasi-constant velocity universal joints: the common quasi-constant velocity universal joints have two types: double and three pin shafts. The working principle of universal joints is the same as that of double cross shaft universal joints. The principle of the shaft unit to achieve constant velocity transmission is the same.The double universal joint is actually a set of double cross-shaft universal joints with constant velocity transmission that reduces the length of the transmission shaft to a minimum. The double fork is equivalent to the universal joint with the transmission shaft and the two ends on the same plane. cross.When the angle of intersection between the output shaft and the input shaft is small, the intersection of the two shaft axes on the arc is very close to the above-mentioned mid-vertical line, so that the difference between α1 and α2 is small, and the angular velocity of the two shafts is nearly equal. The combined universal joint is a quasi-constant velocity universal joint.
4. Constant Velocity Universal Coupling: The constant velocity cross-shaft universal joint commonly used on cars at present is a ball-cage universal joint, and there are also ball-fork universal joints or free three-pivot universal joints. .The star sleeve 7 is connected with the driving shaft 1 by an inner spline, and the outer surface of the star sleeve 8 is provided with six arc-shaped grooves to form an inner raceway.There are corresponding six arc-shaped grooves on the inner surface of the spherical shell 6 to form an outer raceway.The six steel balls 4 are respectively installed in the space opposite to the six sets of inner and outer raceways, and are limited in the same plane by the cage 1.The power is transmitted from the driving shaft 6 through the steel ball 8 to the spherical shell XNUMX for output.
