11x15-2 Roller Bearing

Name Roller material GCR15, stainless steel hardness HRC60-65 excircle tolerance 2um length tolerance 30um verticality ≤ 15um end face runout ≤ 15um roundness ≤ 1um surface roughness ≤ Ra1umGCr15 refers to a high carbon chromium Bearing steel with less alloy content, which has high hardness, uniform structure, good wear resistance and high contact fatigue performance after quenching and low temperature tempering. Areas of application Bearing rollers, jet nozzles of turbojets, plungers, flaps, bushings, etc.

Due to the clearance of the Roller Bearing, the inner and outer rings will move relative to each other under load, which reduces the stiffness of the Roller Bearing, causes radial and axial vibration of the shaft, and affects the working accuracy and service life of the machine. In order to reduce this kind of vibration, for high-precision and high-speed mechanical equipment, pre-tightening method is often used when installing the Roller Bearing, that is, a certain load (radial or axial) is applied to the Roller Bearing in advance during installation to eliminate its original clearance, so that the Roller Bearing body and the inner and outer rings are elastically deformed to prevent the relative movement between the inner and outer rings during work.

1. Cleanliness seriously affects the vibration level of the Bearing, especially in the high frequency band. High cleanliness Bearing low vibration speed.

2. Effect on noise The effect of dust in Bearing grease on noise was tested, and it was proved that the more dust, the greater the noise.

3. Influence on lubricating performance The decrease of Bearing cleanliness not only affects the formation of lubricating oil film, but also causes the deterioration of lubricating grease and accelerates its aging.

Purpose of 1. preloading

The spindle Roller Bearing preload makes the rolling beads and raceways eliminate the original clearance and form a certain elastic deformation. When subjected to external loads, the Roller Bearing has a certain stiffness. For the Roller Bearing installed in the opposite direction of the external load, there will be no gap between the rolling beads and the raceway due to the external load, thereby improving the rotation accuracy of the spindle, strengthening the rigidity of the spindle, extending the service life, and reducing noise.

2. preloading principle The size of preloading is generally determined according to the working load, spindle rotation accuracy and speed. 1. If the spindle load is small, the rotation accuracy is high, and the speed is low, a larger preload is required. 2. If the working load is large, the speed is high, and it is easy to heat up and expand, it is recommended to adopt a smaller preload.

Structure and Characteristics of Roller Bearing with High Bearing Capacity

The wind turbine speed increaser is installed at a high place and it is very difficult to maintain, so the service life and reliability of the speed increaser Bearing are very high. In recent years, wind turbines have become larger and larger. In order to reduce the load of the tower, it is trying to make the generator nacelle small and light, so the demand for small Bearing with high load capacity is further increased. In order to meet this demand, Roller Bearing with high carrying capacity were developed. Since the cage is replaced with a rolling spacer, the carrying capacity is increased without destroying the rotation performance, and the rated life is more than 1.5 times that of the original product.

High bearing capacity Roller Bearing high bearing capacity Roller Bearing structure and characteristics: the new product is designed with resin spacer between Rollers to prevent Rollers from contacting each other. In addition, on the spacer rings that are independently separated from each other, since the tension generated by the clutch and the dispersion of the rollers do not work, the thickness can be reduced, thereby increasing the size and number of rollers. Compared with the structure of the original product, through the performance comparison between the new product and the original product, the high carrying capacity of the new product Roller Bearing has the following advantages:

1. Long life change the size and number of rollers to reach the ideal state, which increases the load capacity. The rated life of the Bearing is more than 1.5 times the Bearing of the original cage with the same size.

2. High speed prevents cylindrical Rollers from contacting each other in fully loaded Roller Bearing. The shape and guiding method of the spacer should be idealized to achieve the same allowable speed and wear resistance as the cage Bearing.

3. Operability Even if the inner ring is removed and the Roller does not fall off, the inner ring and outer ring parts can be installed separately, which can make the installation on the machine easier.

GCr15It refers to a high-carbon chromium Bearing steel with less alloy content. After quenching and low-temperature tempering, it has high hardness, uniform organization, good wear resistance and high contact fatigue performance.

Application field Bearing roller,turbojet engineNozzle, plunger, valve, bushing, etc.