Use 2020 - bearing installed correctly
09 -
21 闫伟刚 (
New Asia paper group)
A, tapered roller bearings, water pump shaft bearing installation 1, must be conducted in a dry, clean environment conditions.
Before installation should carefully check the shaft and the shell surface, convex shoulder of end face and groove and the connection surface machining quality.
All matching connection surface must be carefully cleaned and remove burrs, rough surface must remove all sand castings.
2, before the installation, should be with petrol or kerosene wash clean, dry after use, and to ensure good lubrication, grease lubrication, commonly used bearing lubrication may be adopted.
Using grease lubrication, should choose without impurities, antioxidant, antirust, superior performance, such as extreme pressure grease.
Grease filling quantity for bearings and bearing box - 30% of the volume
60%, unfavorable and overmuch.
With sealing structure of double row tapered roller bearing and water pump shaft bearing has good filling grease, it can be used directly, not to wash again.
3, when installation, must equal pressure on the circumference of the ring width, to press the ring into, may not be directly hit bearing face, in order to avoid damage to the bearings.
In interference quantity is small, can be at room temperature with the sleeve pin bearing ring end face, with a hammer knock sleeve, through the sleeve ring balanced pressure.
Mass when installation, can use hydraulic press.
Fashionable, should guarantee the outer end face and the shell shoulder end face, inner ring end face and the shaft shoulder end face pressure, there is no gap.
When large amounts of interference, can use oil bath heating or sensor heating method to install the bearing, the heating temperature range of 80 ℃ -
100℃。
Tighten bearing at the same time with a nut or other appropriate method, in order to prevent the bearing width after cooling contraction and make the clearance between the ring and the shaft shoulder.
4, single row circular cone roller bearings installed last should undertake clearance adjustment.
Clearance value should be used according to different conditions and specify the amount of interference fit.
When necessary, shall be tested to determine.
Double row tapered roller bearing and water pump shaft bearing in have been adjusted when delivery from factory clearance, installation time don't have to adjust.
5, bearing should rotate test after installation, first used in the axis of rotation or bearing box, without exception, with a power with no load, low speed, then according to the condition of operation gradually increase the speed and load, and detection noise, vibration and temperature rise, found abnormal, should stop and check.
Running test normal rear deliverables.
Second, bearing the removing bearings removed after intends to continue to use, should choose the proper removal tool.
Remove the interference fit ring, can only add tension on the ring, will never allow through transfer roller disassembly force, rolling element and raceway will be crushed.
Three, bearing the use of the environment according to the area of use and conditions of use and environmental condition choose size, precision, with appropriate is the prerequisite of bearing life and reliability of the bearing.
1, use parts: tapered roller bearing is suitable for predominantly radial load under the combination of radial and axial load, usually used in two sets of bearing pairs, mainly should be in the car before and after the wheel hub, active transmission parts, such as bevel gear, differential, reducer.
2, allows speed: under the correct installation, lubrication good environment, allowing for bearing limit speed of 0.
3 -
0.
5 times.
Generally under normal circumstances, with 0.
2 times the limit speed for the most appropriate.
3, allows tilt Angle: taper roller bearings are generally not allowed to have tilted axis relative to the shell hole, if there are any tilt, no more than two largest & prime;
。
4, allow temperature: under normal load, and lubricant has a high temperature resistant performance, and abundant lubrication conditions, general bearing in - are allowed
30℃-
Work under the temperature 150 ℃.
Four, the installation of the high speed precision angular contact ball bearing high speed precision angular contact ball bearing, mainly used for high speed rotating load lighter, bearings and high precision, high speed, low temperature rise, low vibration and service life.
Often for high speed motorized spindle bearing parts installed in pairs, is the key to the high-speed motorized spindle surface grinding machine fittings.
1, the main technical indicators: (
1)
Bearing precision index: more than GB / 307.
1 -
94 P4 level precision (
2)
High-speed performance indicators: dmN value of 1.
3 to 1.
8 x 106 /分钟(
3)
The service life (
On average)
:> 1500 h2, high-speed precision angular contact ball bearing service life had a lot to do with the installation, should pay attention to the following matters: (
1)
Bearing installation should be clean, clean the room, the bearing should be carefully selected, bearing with baffle passes through grinding, and in keeping the baffle on inner and outer contour under the premise of baffle parallelism should be controlled below 1 um.
（
2)
Bearing should be cleaned before installed and when cleaning inner ring ramp up, flexible hand induction, no stagnation, air-dried, into the specified amount oil, if oil mist lubricating oil should be in a small amount of oil mist;
（
3)
Bearing installation should use specialized tools, force uniform, do not knock;
（
4)
Bearing deposit should be clean and ventilated, non-corrosive gas, more than 65% relative humidity, long-term storage should be rust on a regular basis.
