[China Aluminum Network] sliding bearing (sliding bearing), bearings that work under sliding friction. Slide bearings work smoothly, reliably and without noise. Under the condition of liquid lubrication, the sliding surface is separated by lubricating oil without direct contact, friction loss and surface wear can be greatly reduced, and the oil film also has a certain ability of absorbing vibration. However, the starting frictional resistance is large. The part where the shaft is supported by the bearing is called the journal, and the part that matches the journal is called the bearing. The friction-reducing material layer cast on its inner surface to improve the frictional properties of the pad surface is called a bearing lining. Bearing pad and bearing material are collectively referred to as the plain bearing material. Commonly used plain bearing materials are bearing alloys (also known as babbitt or white alloy), wear-resistant cast iron, copper-based and aluminum-based alloys, powder metallurgy materials, plastics, rubber, hardwood and carbon-graphite, polytetrafluoroethylene (PTFE) ), modified polyoxymethylene (POM), etc. Sliding bearing applications are generally under low-speed, heavy-duty conditions, or are difficult to maintain and refill lubrication.
A precision mechanical element called sliding bearing, in which the sliding friction between the running shaft and the shaft seat becomes rolling friction, thereby reducing the frictional loss. Rolling bearings generally consist of outer rings, inner rings, rolling elements and cages. The function of the inner ring is to cooperate with the shaft and rotate with the shaft. The function of the outer ring is to cooperate with the bearing seat and play a supporting role. The rolling elements distribute the rolling elements uniformly between the inner ring and the outer ring by means of the cage. The shape and quantity of the bearing directly affect the performance and life of the rolling bearing. The cage can evenly distribute the rolling elements, prevent the rolling elements from falling off, and guide the rolling elements to rotate to act as a lubricant.
The rolling bearing is easy to use and maintain, reliable in operation, good in starting performance, and has high bearing capacity under moderate speed. Compared with the plain bearing, the radial dimension of the rolling bearing is larger, the vibration-reducing ability is lower, and the life at high speed is low and the sound is louder. The radial bearings in a rolling bearing (mainly subjected to radial forces) are usually composed of an inner ring, an outer ring, rolling elements and a rolling element cage 4 part. The inner ring is tightly sleeved on the journal and rotates with the shaft, and the outer ring is mounted in the housing bore. A raceway is formed on the outer circumference of the inner ring and the inner circumference of the outer ring. When the inner and outer rings rotate relative to each other, the rolling elements roll on the raceways of the inner and outer rings. They are separated by cages to avoid mutual friction. The thrust bearing is divided into two parts: a tight ring and a live circle. The tight ring and bushing are tight and the diaphragm is supported on the bearing seat. Ferrules and rolling elements are usually made of high-strength, wear-resistant rolling bearing steel. After quenching, the surface hardness should reach HRC 60-65. The cage is mostly made of stamped steel and can also be made of copper alloy cloth bakelite or plastic. The difference between the rolling bearing and the sliding bearing is firstly represented in the structure. The rolling bearing is supported by the rotation of the rolling elements to support the rotating shaft. Therefore, the contact point is a point. The more the rolling elements, the more the contact points are; the sliding bearing is on the smooth surface. To support the rotating shaft, the contact area is a face. Followed by different ways of movement, rolling bearing movement is rolling; sliding bearing movement is sliding, so the friction situation is completely different.
Barbed Wire,Barbed Wire Fencing,Barbed Wire Fence,Barbless Wire
Shenzhou City Hongda Hardware Products Co.,Ltd , https://www.hdpvcwire.com