What are the structural characteristics of a universal joint?

1) Unequal velocity universal joint.

Cross-shaft rigid universal joint is widely used in automobiles for unequal velocity universal joints, and the maximum intersection angle of two axes of adjacent constant velocity universal joints is allowed to be 15° 20°. The cross-shaft universal joint consists of a cross-shaft, two universal forks, and four needle roller bearings.

and so on. When the driving shaft rotates, the driven shaft can not only rotate with it, but also swing in any direction around the center of the cross shaft, so as to adapt to the needs of simultaneous changes in angle and distance. In order to lubricate the bearings, grease nipples are generally installed on the cross shaft and an oil circuit leads to the journal.

The lubricating oil can be injected from the grease nipple into the needle roller bearing of the cross journal. Cross shaft type rigid universal joint has the advantages of simple structure, high transmission efficiency, but under the condition that the angle between two shafts is not zero, can not transmit constant angular speed rotation.

2) Quasi-constant velocity universal joint The quasi-constant velocity universal joint is made according to the principle of two ordinary universal joints to achieve constant velocity transmission. The common ones are duplex and three-pin universal joints. A duplex universal joint is actually a set of propeller shafts.

Reduced length to a minimum of twin universal joint drives. The duplex universal joint allows a large angle between the shafts, and the structure is simple and the manufacturing is convenient. The three-pin shaft universal joint is a quasi-constant velocity universal joint evolved from the duplex universal joint.

The biggest feature of the three-pin type universal joint is that it allows two adjacent shafts to have a large intersection angle, up to 45°. The steering drive axle with this universal joint allows the car to achieve a small turning radius.

Improved the mobility of the car.

3) Constant velocity universal joint The common structural forms of constant velocity universal joint are ball cage type and ball fork type. When the ball cage constant velocity universal joint is working, the six steel balls are involved in force transmission, so the bearing capacity is strong, the wear is small, and the service life is long. It is widely used in various types of steering drive axles and drive axles with independent suspension.

1. Unequal velocity universal joint: that is, the commonly used cross shaft universal joint. The angular velocity of the driven shaft varies during one revolution of the driving shaft.

In order to achieve constant velocity rotation, it should generally be used in pairs, that is, two universal joints are installed at both ends of the transmission shaft, so that the universal joint forks at both ends of the transmission shaft are in the same plane; The driving shaft and the driven shaft should be basically parallel. It is mainly composed of universal joint forks, cross shafts and needle roller bearings and other mechanical parts.

2. Constant velocity universal joint: its transmission feature is that the rotation angular velocity of the driving shaft and the driven shaft is equal. Cars driven by the front axle are equipped with constant velocity joints (drive and steering).

Constant velocity joints generally come in three forms. The ball fork constant velocity universal joint is mainly composed of a driven fork (outer half shaft), a driving fork (inner half shaft), a steel ball, a pin, and a positioning steel ball. The ball cage type constant velocity universal joint is mainly composed of a star-shaped sleeve (inner raceway) connected to the driving shaft, a spherical shell (outer raceway) connected to the driven shaft, a steel ball (generally six, all can transmit force) and a cage (ball cage).

Due to its large allowable transmission angle (about 420), strong bearing capacity, compact structure, and easy disassembly and assembly, it is more and more widely used.

Universal joint is universal joint, English name: universal joint, is a mechanism to realize variable angle power transmission, used for the position that needs to change the direction of the transmission axis, it is the "joint" component of the universal transmission device of the automobile drive system. The universal joint is combined with the transmission shaft, which is called the universal joint transmission device. On front-engine, rear-wheel drive vehicles, the universal joint transmission is installed between the output shaft of the transmission and the input shaft of the drive axle final reducer; Whereas front-engine, front-wheel drive vehicles omit the propeller shaft, and the universal joint is installed in charge of the structure and function of the universal joint, which is a bit like the joints on the human limbs, which allows the angle between the connected parts to vary within a certain range.

In order to meet the power transmission, adapt to the angular changes caused by the up-and-down runout caused by the steering and the running of the car, the drive axle, half shaft and wheel axle of the front-drive car are often connected by universal joints. However, due to the limitation of axial size, the declination angle is relatively large, and the instantaneous angular velocity of the output shaft and the shaft into the shaft can not be equalized by a single universal joint, which is easy to cause vibration, aggravate the damage of the components, and produce a lot of noise, so a variety of constant velocity universal joints are widely adopted. In front-drive cars, two constant velocity joints are used for each half-shaft, the universal joint close to the transmission drive axle is the half-shaft inner universal joint, and the outer half-shaft universal joint is close to the axle.

In rear-drive cars, the engine, clutch and transmission are mounted on the frame as a unit, while the transaxle is connected to the frame by elastic suspension, and there is a distance between the two that needs to be connected. The uneven road surface in the operation of the automobile produces runout, load change or the difference of the two assemblies installed, etc., will make the angle and distance between the transmission output shaft and the input shaft of the drive axle main reducer change, so the universal joint transmission form of the rear drive automobile adopts double universal joint, that is, there is a universal joint at both ends of the transmission shaft, and its function is to make the angle of the transmission shaft at both ends equal, so as to ensure that the instantaneous angular velocity of the output shaft and the input shaft is always equal. The drive, in turn, is responsible for steering between the front axle half-axle and the wheels.

Universal joint is universal joint, universal joint mainly refers to the cross shaft type rigid universal joint, which is composed of universal joint fork, cross shaft, needle roller bearing, oil cover trouser seal, sleeve, bearing cover and other parts. The universal joint is the universal joint, which is a part that realizes the transmission of variable angle power, and is used to change the position of the direction of the transmission axis, and it is the "joint" component of the universal transmission device of the automobile drive system. The universal joint is combined with the transmission shaft, which is called the universal joint transmission device.

The principle of the cross-shaft universal joint is as follows:

1. One of the rotating forks drives the other fork to rotate through the cross shaft, and at the same time, it can swing in any direction around the center of the cross shaft;

2. The needle roller in the needle roller bearing can rotate itself during rotation to reduce friction. The shaft that is connected with the input power is called the input shaft (also known as the driving shaft), and the shaft that is output through the universal joint is called the output shaft (also known as the driven shaft);

3. Working under the condition that there is an angle between the input and output shafts, the angular velocity of the two shafts is unequal, which will cause the output shaft and the transmission parts connected to it to produce torsional vibration and affect the life of these components.

Millions of car purchase subsidies.

What does a gimbal do? The role of the gimbal is as follows:

1. The universal joint is a component that realizes the transmission of power at different angles between the rotating shafts;

2. Rigid universal joints are more widely used in cross-shaft rigid universal joint automobiles;

3. The cross-shaft rigid universal joint has a simple structure, reliable work, and allows a large intersection angle between the two shafts connected, which is the most common application in automobiles;

4. Constant velocity conditions of cross-shaft universal joint transmission. Adopt double universal joint transmission, and the angle 1 between the two shafts of the first universal joint is equal to the angle 2 between the two shafts of the second universal joint; The driven fork of the first universal joint is in the same plane as the active fork of the second universal joint;

5. Quasi-constant velocity universal joints and constant velocity universal joints are allowed to have large angles between shafts, good bearing sealing, high efficiency, simple manufacturing process, convenient processing and reliable work. It is mostly used in off-road vehicles.

In the transmission process of the universal joint of the cross shaft, the speed of the main and driven shafts is not equal. The so-called "uneven variable speed" refers to the uneven angular velocity of the driven shaft during rotation. In short, the advantages of the equipment include safety, simple structure, easy use and maintenance, and low cost; But the disadvantages are low technical content, too low, too many fakes on the market, and a great waste of raw materials.

The advantage of the universal joint is that it makes the transmission design of the equipment simpler. Its features include:1

The transmission shaft can evenly transmit the power of the transmission (or transfer case) to the reduction gear in the main transmission within a certain angle range to avoid damage to the transmission shaft parts; 2.There are two types of universal joints, unequal velocity universal joints and constant velocity universal joints. The commonly used cross-shaft universal joint belongs to unequal velocity universal joint, and the angular velocity of the driven shaft is different in the process of rotation; 3.

In order to achieve constant velocity rotation, it should generally be used in pairs, that is, a universal joint is installed at both ends of the transmission shaft, so that the fork of the universal joint is on the same plane; 4.The driving shaft and the driven shaft should be basically parallel, mainly composed of universal joint fork, cross split shaft and needle roller bearing; 5.The transmission characteristic of constant velocity universal joints is that the rotation angular velocity of the driving shaft and the driven shaft is equal.

There are three types of such gimbals. The advantages of this universal joint are simple structure, reliable transmission and high efficiency. When the plane of the drive fork is in a vertical position and the plane of the cross shaft is perpendicular to the axis of the drive shaft, the speed of the driven shaft is greater than the speed of the drive shaft.

In short, universal joints are an important component of the transmission device, and different types of universal joints play an important role in different environments and tasks.

The functions of the universal joint are as follows: 1. The universal joint is a component that realizes the transmission of power between the rotating shafts at different angles; 2. Rigid universal joints are more widely used in cross-shaft rigid universal joint automobiles; 3. The cross-shaft rigid universal joint has a simple structure, reliable work, and allows a large intersection angle between the two shafts connected, which is the most common application in automobiles; 4. Constant velocity conditions of cross-shaft universal joint transmission. Adopt double universal joint transmission, and the angle 1 between the two shafts of the first universal joint is equal to the angle 2 between the two shafts of the second universal joint; The driven fork of the first universal joint is in the same plane as the active fork of the second universal joint; 5. Quasi-constant velocity universal joints and constant velocity universal joints are allowed to have large angles between shafts, good bearing sealing, high efficiency, simple manufacturing process, convenient processing and reliable work.

It is mostly used in off-road vehicles.