Come to Understand The Classification of Universal Joints

What are the general classifications of universal joints? Let's take a look with Xinshiji universal joint manufacturer:

According to whether the universal joint has obvious elasticity in the torsion direction, it can be divided into rigid universal joint and flexible universal joint. Rigid universal joints can be divided into unequal velocity universal joints (commonly used as cross shaft type), quasi-constant velocity universal joints (such as double joints) and constant velocity universal joints (such as ball cage universal joints). Xiang section) three kinds.

(1) Variable speed universal joint

The cross-shaft rigid universal joint is a variable speed universal joint widely used in automobiles, and the maximum angle of intersection between two adjacent shafts is allowed to be 15゜～20゜. The cross shaft universal joint shown in the figure below consists of a cross shaft, two universal joint forks and four needle bearings. The holes on the two universal joint forks 1 and 3 are respectively sleeved on the two pairs of journals of the cross shaft 2. In this way, when the driving shaft rotates, the driven shaft can rotate along with it, and it can swing in any direction around the center of the cross shaft, so that the need for simultaneous changes of the angle and distance is met. A needle roller bearing 5 is installed between the cross shaft journal and the universal joint fork hole, and the outer ring of the needle roller bearing is axially positioned by the snap ring. In order to lubricate the bearings, oil injection nozzles are generally installed on the cross shaft and an oil path leads to the journal. Lubricating oil can be injected from the grease nipple to the needle bearing of the cross shaft journal.

(2) Quasi-constant velocity universal joint

Common quasi-constant velocity universal joints have two types, double-joint type and three-pin shaft type. Their working principle is the same as that of double cross-shaft universal joint to realize constant velocity transmission. The double universal joint is actually a set of double cross-shaft universal joint constant velocity transmission device that reduces the length of the transmission shaft to the 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 point 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. Combined universal joints are quasi-constant velocity universal joints.

(3) Constant velocity universal joint

At present, the commonly used constant velocity universal joints on cars are ball-and-cage universal joints, 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 six arc-shaped grooves are formed on the outer surface to form an inner raceway. The inner surface of the spherical shell 8 has corresponding six arc-shaped grooves to form an outer raceway. The six steel balls 6 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 4.

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