Views:0 Author:Site Editor Publish Time: 2021-03-04 Origin:Site
Universal joint is a mechanism for variable angle power transmission, which is used to change the direction of the transmission system, as the "joint" part of the car drive system. Universal joints will withstand various forces, such as torsion and centrifugal force, during high-speed motion. Universal joint is located in the active area and is subject to harsh working conditions, which is easy to wear and fragile.
How many types of universal joints are there?
What are the features of universal joints?
What are the applications of universal joints?
Universal joints transmit power between the drive shafts, even if the rotating shafts are not in-line. Common universal joints include cross universal joints, CV joints and tripod universal joints. Cross universal joints are usually used in passenger cars and freight vehicles, while CV joints are usually used in automobiles.
The cross universal joint is composed of universal joint fork frame, cross shaft, needle bearing, oil seal, sleeve, and bearing cover. The needle in the needle bearing rotates during the rotation of the universal joint to reduce friction. The shaft connected to the input power is called the input shaft, and the shaft that transmits power through the universal joint is called the output shaft.
CV joints vary according to the structure of the inner and outer raceways, which are divided into telescopic and fixed. Telescopic constant velocity joints are usually used for internal universal joints, and fixed ball cage joints are usually used for external universal joints. The CV joint is mainly composed of outer star wheel, ball cage, steel ball, inner star wheel and so on. The spherical shell is the outer orbit of the ball, and the star shell is the inner orbit of the ball. Power transmission path is from half shaft, that is drive shaft to star shell to steel ball to spherical shell to wheel center shaft, that is driven shaft. The structure of the CV universal joint is similar to a ball bearing, which is all composed of balls, fixed brackets, internal and external tracks, but the shaft connected to the internal star bearing shell of the universal joint can swing and retract.
The tripod universal joint has the advantages of simple structure, small size and light weight, which is widely used in the front and rear drive axles of automobiles. When the barrel housing rotates, the ball wheel will pull the tripod shaft to follow it, and the three pivots are splined to the driven shaft, which in turn will cause the driven shaft to rotate for power transmission.
In a car with front-engine rear-wheel drive, there is often relative movement between the input shaft of the drive shaft final drive and the output shaft of the transmission due to the deformation of the suspension during the movement of the car. In addition, in order to effectively avoid certain mechanisms or devices, there must be a device to achieve the normal transmission of power, so universal joint transmission appears. The universal joint drive must have the following characteristics:
1. Ensure that the power can be reliably transmitted when the relative position of the two connected shafts changes within the expected range;
2. Ensure that the connected two shafts can run evenly. The additional load, vibration and noise caused by the included angle of the universal joint should be within the allowable range;
3. High transmission efficiency, long service life, simple structure, convenient manufacture and easy maintenance. For automobiles, because the output shaft of a cross-shaft universal joint rotates at unequal speeds relative to the input shaft, double universal joints or multiple universal joints must be used for transmission. The two universal joint forks connected with the drive shaft are arranged on the same plane, and the angles of the two universal joints are equal. The angle of the universal joint should be minimized when designing.
With the vigorous guidance and support of national policies, along with my country's transformation to the world's universal joint power, the concentration of my country's universal joint industry will further increase. With the unfolding of industry integration, market share has begun to gradually concentrate on a few advantageous companies, and the production concentration of the universal joint industry is gradually increasing. The increase in market concentration is conducive to the integration of industry resources and the realization of scale effects, as well as the overall development of the universal joint industry.
The universal joint industry has weak bargaining power on raw materials, while steel prices have a greater impact on the control of enterprise production costs. In addition, on the basis of the original numerous state-owned universal joint manufacturers, private enterprises have sprung up, and foreign-funded enterprises have rushed into the market.
In recent years, the world's manufacturing industry has shifted to China, and the development of China's automobile, machinery and other industries has stimulated the demand for universal joints. The universal joint industry is a perfectly competitive industry with low barriers to entry. However, due to the flood of low-end products in China's universal joint industry, the overall competitiveness of the industry is not strong, and new entrants cannot gain a foothold in the industry without considerable strength.
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