In the wake of the motor vehicle’s development to the high velocity, high dependability, low energy consumption, its cool water pump is also required to develop to light weight, little volume, high efficiency. The water pump bearing, as a kind of simple double-load bearing, has been accepted by many developed countries because of its more load, good hard , high accuracy,of rotate, simple structure, easy dismounting,better seal and more high anti-heat.
At present , water pump bearing is not only used in cool water pump,but also used in Spinning machine, Engineering machine and so on . |
The range of products |
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Material and heating treatment |
We mainly choose heightening GRPA66 as the material of cage ,NRB as sealing encircling's. When the environment temperature is more than 120 oC, we choose fluorine rubber as the material of sealing encircling.
The ball and the roller of HSB are all made by high chrome steel, shaft, outer ring use carbon steel or chrome steel. Usually, if the shaft's material is high-carbon, the hardness reaches 60-64HRC. And if the shaft material is high-chrome, the hardness reaches 58-62HRC. The hardness of ball and roller reaches 61-65HRCand the hardness of outer ring is 60-64HRC.
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Lubrication and Seal |
The water pump bearing adopts once-time lubrication, which is also a kind of lifetime lubrication. so lubricating directly affects the bearing's service-life. Usually, No. 2# or No3#grease can satisfy the requirement of lubrication, the quantity sould be 1/4or 1/2 part of the space. The fuction of the water pump bearing seals is to exclude contaminants,such as dust or coolant vapour,while retaining the lubricant.
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Clearance |
The real inherent backlash of the bearing of the water pump influence service life and performance of the bearing greatly in using, At choosing primitive radial backlash except want , consider bearing outer lane with bearing flat hole pass , full of cooperate and reduction of backlash that cause. Consider causing the reduction of backlash because relevant parts that Wen Sheng caused are hot and bloated, Cross the full ofing amount and recommend using Table 1. HSB water pump axle connects with the bearing while there is no special requirement, The primitive radial backlash of the complete sets of bearing is 15- 35µm. Bearing outer diameter
D(mm) | Pump housing inside diameter deviation (µm) | Iron | Aluminium | 30 followings | 25-45 | 35-55 | More than 30 | 32-55 | 55-76 |
| The intenal bearing clearance in rolling bearings in operation greatly influences bearing performance in terms of fatigue life, vibration, noise, heat-generation, ect. Conaequently, the selection of a proper internal clearance is one of the most important tasks. The oretically, the longeat bearing life can be expected when the clearance is slightly negative. However, it is difficult to achieve such an ideal condition, and an excessive negative clearance will greatly shorten the bearing life. Therefore, a clearance of zero or a slightht positive amount, instead of a negative one, should be selected in general. When choosing the clearance, we should not only consider the decrease of the clearance, because of the interference fit between the outer ring and bearing seating,but also should consider the decrease of the clearance, because of the increasing of the temperature. The shell of the water pump bearing has two kinds of shell, one is iron, another is aluminum. The fit of the water pump bearing and shell is interference fit (For list one). HSB bearing has no special requirements. The radial clearance is 15-35µm. |
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Accuracy |
The tolerance of water pump bearing needs to satisfy with LIST TWO.
The coarseness of water pump bearing needs to satisfy with LIST THREE.
The accuracy of revolution is not more than 0.025mm. Form2:Shaft continually bearing size common difference (µm) | outring | D ( mm) | △ Dmp | V Dp | V Dmp | △ Cs | V cs | over | to | high | low | MAX | MAX | high | low | MAX | 18 | 30 | 0 | -13 | 12 | 8 | 0 | -130 | 20 | 30 | 50 | 0 | -13 | 16 | 10 | 0 | -130 | 20 | 50 | 80 | 0 | -15 | 20 | 11 | 0 | -130 | 20 |
| shaft | d ( mm ) | △ dmp | V dp | V dmp | △ Bs | over | to | high | low | MAX | MAX | high | low | 10 | 18 | 0 | -13 | 8 | 8 | +250 | -250 | 18 | 30 | 0 | -13 | 9 | 9 | +250 | -250 |
| Spot | Outer diameter | End surface | Fillet | Ra Not greater than | outring | 0.63 | 6.3 | 5 | shaft | 0.63 | 6.3 | 5 |
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mounting |
When mounting the bearing into the housing,care must be taken to prevent the transmitting of forces through the ball complement.it also must provide adequate bearing support without inducing ovality into the raceways.Strictly forbid transmiting pressure by means of the roll part of the body,Pounding outside ought to avertingmoreover strenuously injures the bearing ,Circularity in water pump casing part of the body opening is dominateeed being living 10 µm ,Cylinder number of degrees 20 µm.
Mounting picture of sketch map :
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