Publish Time: 2019-05-01 Origin: Site
Choosing the right slewing support can be a challenge, especially when there are strict technical, reliability or economic requirements. For example, in these cases, our company can use state-of-the-art analytical methods to provide advanced computing and simulation to optimize and validate the best design to meet customer needs. Our company has a variety of design standards and diameter from 0.2 meters to 5 meters of custom rotary bearings to meet the needs of special applications. This article is a brief analysis of four point contact ball bearings, mainly including the meaning and application of 4 point contact ball bearings.
Definition of four point contact ball bearing
Application of four point contact ball slewing bearing
Four point contact ball bearing specification
Four point contact ball bearing is a kind of separated bearing, or a set of angular contact ball bearings which can withstand bidirectional axial load. The inner raceway and outer raceway are peach-shaped sections. When there is no load or pure radial load, the steel ball and ring show four-point contact, which is also the origin of the name. 4 point contact ball bearings are radial single row angular contact ball slewing bearings with raceways, designed to handle biaxial axial loads. These four-point contact ball bearings require minimal space to withstand pure axial or combined loads. For heavy industry requirements, 4-point contact spherical rings can be designed as large slewing bearing with bolted seat rings and internal or external integral transmission devices. 4-point contact ball bearings can handle all three at the same time, which makes it easy to simplify mechanical design, which combines radial, thrust and moment loads. The main materials of four-point contact ball bearings are 50Mn, 42CrMo and C45.
Four point contact ball bearing is widely used in construction machinery, construction machinery, metallurgical mining machinery, port machinery, environmental protection machinery, light industrial machinery, petrochemical machinery, engineering vehicles, military equipment, food machinery, canned machinery, automobile parking system, etc.
1. Application of 4 point contact ball bearing in Crane .
The application of four-point contact ball slewing support in crane is one of the important bearing parts of crane. Connecting with turntable welding parts, the structure is complex and the load is large. Based on the finite element method, the finite element calculation model of four-point slewing support of truck crane is established, and its structural strength and stiffness are analyzed.
2. Widely used in marine cranes, port cranes, offshore cranes, gantry cranes, etc.
The contact angle 4 point contact ball bearing is usually 45 degrees. If there is only radial load, each ball contacts the raceway at four points. If there is only one-way axial load, each steel ball contacts the raceway at two points. It can withstand two directions of axial load and eccentric load, that is, torque. The bearing has the characteristics and performance of single row and double row angular contact ball bearings. If used at high speed, two contact points must be guaranteed to work properly.
The following factors need to be taken into account when making alternative schemes for slewing bearings:
1. Accuracy
When the precise positioning of bearings by mechanism requires high precision, the cross roller slewing support is usually chosen.
2. Bearing capacity
Load capacity is the most important factor in determining bearing size when you plan. Generally, four-point contact spherical slewing bearings can withstand large radial and impact loads, so they are suitable for heavy loads, and the size and direction of loads may change. This occasion.
3. Working temperature
In most cases, the allowable working temperature of slewing bearings mainly depends on grease, gaskets and sealing materials. Usually, the allowable working temperature range of the slewing bearing is - 25 to + 70 degree C. If the slewing support is required to operate outside the reference temperature, please contact our engineer.
4. Vibration
For applications involving vibration, preloaded four-point contact spherical slewing support and cross-cylindrical roller slewing support are appropriate.
In summary, it is a simple analysis of some aspects of 4 point contact ball bearings. Please select the 4 point contact ball bearings you want for your reference when purchasing goods. If you have any questions, we are glad to provide you with more detailed answers.