Grease Injection Device for Deep Groove Ball Bearings
Lubricants are often considered the fifth largest part of rolling bearings, and without a good lubricated bearing will not work properly.
Due to factors such as conditions, environmental conditions and installation location, it is necessary to use a grease-lubricated method and a double-sided sealing device.
One-time deep groove ball bearings, see Figure 1. This is because the sealing device that prevents lubricant consumption is simpler when using grease lubrication, and at the same time
Grease lubrication also has a higher heat resistance limit and prevents the intrusion of impurities. Although grease-lubricated bearings are widely used, in the production process, how to control the amount of grease installed in the bearing internal space is the key to ensure the normal operation of the bearing. for
For small bearings (26 mm ≤ D < 60 mm), the amount of grease charged is calculated in g, and the allowable variation is ≤ 0.5 g.
2.1.1 Amount of grease injection
In the production process, the process of loading grease into the bearing internal space is called “lubricating”, and the amount of grease is called “lubricating amount”.
“Filling amount” is very important for high-speed running bearings. Too little will reduce the lubrication effect and shorten the bearing life. Excessively, the bearing will heat up rapidly under the action of friction and friction, and the sealing device will be squeezed out. Or deformed and failed.
2.1.2 grease filling position
The most ideal grease filling position should be to inject the grease into the inner and outer channels of the bearing to achieve the best lubrication effect, so that it will not cause waste due to the overflow of the grease, especially those expensive. Premium fat.
2.2 The necessity of optimizing the design
Feeding the grease into the bearing is accomplished by a grease cap, see Figure 2. The grease enters the bearing internal space through the grease injection hole under the action of the grease pump. The grease head defect of this structure is that the grease is first sent to the rivet position of the cage, and then spreads to the periphery under the blockage of the rivet and the cage. Since the fluidity of the grease is extremely poor, only a small portion enters the channel. Most will attach to the outside of the rivet and cage. If the amount of grease is increased, friction stir is inevitable, and it is a waste for the higher-priced special grease. Therefore, it is necessary to improve the structure of the grease-filling head. The grease injection head before optimization design is shown in Figure 3. The characteristics are: simple structure and good processability, but the grease injection effect is not ideal.
3 improved design of grease injection head (take 6202 product as an example)
3.1 Design Principles
(1) Targetedly solve the quality problem of the grease injection process, and strive to control the amount of grease injection and grease injection, and pay attention to practicality;
(2) The processability of the product is good and easy to process;
(3) Strive to create low prices and focus on economy.
3.2 Working principle after optimizing design
The improved grease head structure is shown in Figure 4. Working principle: the grease enters the lower end of the inclined hole 2 through the straight hole 1 and directly enters the inner and outer channels of the bearing without being blocked by the cage and the rivet. Figure 5 shows the actual design of the 6202 bearing grease head after optimization.