Auto water pump shaft bearing sealing has the certain difficulty coefficient

Because as a car key diesel engine were heading for the big power and high efficiency of bearing development trend, thus, to even auto water pump shaft bearing explicitly put forward the characteristics of the high. If have higher thermal performance, greater capacity and excellent sealing property, etc. Even auto water pump shaft bearing is developed in order to better in described must design a new type of structure of rolling bearing. It is essentially a simplified double support shaft, two cast within the rolling bearing no support ring, double twist dovetail guideway do immediately on the shaft, two support ring rolling bearing coat made an overall, on both sides with hydraulic seal sealing ring, a coupling component. In bearing capacity under the same standard, its axial size is lower than the general type rolling bearing; Under the same axial size, its bearing capacity than the general type rolling bearing. Because good stiffness, rotation, and simple structure, convenient installation, many western capitalist countries such as Britain, Japan, France and other already choose such tectonic axis of rolling bearing. Even part of the present stage our country automobile water pump shaft bearing haven't choose this kind of structure form, but still with two deep groove ball bearing and axle shaft system. This kind of form construction phase, installation process more multifarious, low efficiency, poor stiffness, has been excellent centrifugal water pump shaft replaced by rolling bearing. RTL enterprise development and design of all kinds of centrifugal water pump shaft bearing, had been widely used in domestic and introducing cars. Centrifugal pump is a centrifugal pump cover, shaft rolling bearing, exhaust valve, cooling fan and transmission equipment, centrifugal impeller. Even the rolling bearing is the key part of centrifugal pump. Because of centrifugal pump rotating speed is higher, the general of centrifugal pump rotating speed ratio of 6000 r/min, the high-speed rotation of the centrifugal pump speed than the height of 9000 r/min, thus regulation shaft rolling bearings have higher bearing capacity, it can consider the service life of the centrifugal pump under a certain speed than the rule. Interior space is part of the centrifugal pump is restricted, heat removal with an area of small, working standard in the extreme, even the rolling bearing and shaft should be able to consider the heat can still maintain normal operation of all the rules, also don't reduce the bearing capacity of the rolling bearing. The sealing has the certain difficulty coefficient of rolling bearing, the sealing reliability and performance will be immediate harm, the application of centrifugal pumps. To sum up, even the rolling bearing of the shaft bearing capacity, lateral clearance work a danger to the centrifugal water pump performance index and its sealing characteristics of the three key performance parameters. Even auto water pump shaft bearing of steel ball bearings and roller bearings are usually made by 45 # steel production, high chrome axis, the outside of the material selection nitriding or high chromium steel 45 # steel production. Shaft with nitriding of 45 steel production of raw materials when the strength of the shaft dovetail slideway is generally 60 - 64HRC； No. 45 high chromium steel manufacturing shaft strength for 58 - commonly 62HRC； The strength of the bearing steel ball and roller bearings is 61 - 65HRC； The lateral strength is generally 60 - 64HRC。