Thrust bearings used in the installation of the engine and torque converter are usually installed with the engine and torque converter in an eccentric condition. If eccentricity is not allowed, the bearing ring guard and the retainer will become hot and cause wear. Therefore, there are two requirements in the market: (1) allowing large eccentricity and long life; and (2) integrating the bearing ring and the retainer for the purpose of embedding. However, the bearings of the old structure can not meet these two functions. Either even if large eccentricity is allowed, the structure is still separate; either a one-piece structure is used, but a large eccentricity is not allowed.
Eccentric bearing ring integrated thrust needle roller bearing realizes long life by adopting the following three measures while realizing the integral structure of the bearing ring: (1) In order to make the gap between the bearing retainer and the bearing ring in the radial direction It is set to be larger than the eccentric amount, and the internal structure is improved; (2) FEM analysis is used to optimize the shape and thickness of the holder to improve the strength of the retainer; (3) to prevent surface damage caused by the reduction of lubricating oil. A guide groove is designed in the bearing ring. In addition, its integral structure is realized by using the bearing ring arm claw structure and the snap structure. By minimizing the number of parts, not only is cost control increased, but it is also easy for customers to perform assembly operations.
Globe valve, also known as cut-off valve, is a mandatory sealing valve, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters the valve from under the valve disc, the resistance that the operating force needs to overcome is the friction force between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the valve stem The diameter of the valve should be large, otherwise the failure of the top of the valve stem will occur. According to the connection method, it is divided into three types: flange connection, thread connection and welding connection. After the appearance of the self-sealing valve, the medium flow direction of the globe valve is changed from the top of the valve disc into the valve cavity. At this time, under the action of the medium pressure, the force to close the valve is small, but the force to open the valve is large, and the diameter of the valve stem can be adjusted accordingly. decrease. At the same time, under the action of the medium, this form of valve is also tighter. my country's valve "Three Chemicals" once stipulated that the flow direction of the globe valve should be from top to bottom. When the globe valve is opened, the opening height of the valve disc is 25% to 30% of the nominal diameter. The flow rate has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the fully open position of the globe valve should be determined by the stroke of the valve disc.
Shut-Off Valve,Shutoff Valve,Automatic Shut Off Valve,Auto Shut Off Valve
Jiangsu Qiantu Trading Co., Ltd. , https://www.jsqiantupump.com