Method for adjusting pre-tightening amount adjustment eccentric bearing

Bearings in the installation process to control the preload is mainly angular contact ball bearings, eccentric bearings, tapered roller bearings, tapered double row cylindrical rollers, etc., in the final stage of these types of bearing installation, it is more accurate Adjust the clearance, that is, control the preload amount (load), especially for the shafting system that has strict requirements on the rotation accuracy, noise and temperature rise of the machine tool spindle, not only the preload amount (load) adjustment clearance should be controlled during the initial installation. And also need to adjust in use. There are many pre-tightening control methods. The following are several methods for controlling the pre-tightening amount to adjust the play.

(1) Measuring the starting friction torque of the eccentric bearing, pre-measuring the relationship between the starting friction torque of the bearing and the axial load, and controlling the starting friction torque to adjust the pre-tightening amount, which is often used for the axial direction of the pair of tapered roller bearings installed. Preload

(2) Measuring the axial displacement of the bearing, pre-measuring the relationship between the axial load and the axial displacement of the eccentric bearing for the tapered bore bearing, and adjusting the preload by controlling the axial displacement

(3) Measuring the deformation amount of the preload spring, measuring the relationship between the load and the deformation of the spring in advance, and controlling the deformation amount to adjust the load of the constant pressure preload

(4) Measure the tightening torque of the nut. When pre-tightening the bearing with a nut, adjust the pre-tightening amount with the tightening torque of the control nut.

(5), using the bearing end cover padding, will cause one end to tighten, the other end bearing does not put the gasket first, tighten the screw, when the shaft is not free to rotate, it shows that there is no play in the shaft system, with thickness gauge, etc. Measure the gap between the end cap and the end of the bearing housing. Add this value to the required clearance value.

(6), using the middle spacing sleeve, the length of the inner ring spacer can be calculated from the length of the outer ring spacer of the bearing and the supporting size. It can also be measured to determine the preloading load of the eccentric bearing. It is difficult to detect with a few special instruments. In addition, most of them use the dial gauge to measure the axial direction of the shaft, the radial displacement or the measured starting friction torque. Some foreign bearing companies use the special instrument and some structure to pre-tighten the pre-tightening load at the optimum value. The load is detected and adjusted to achieve pre-loading control.

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Application and maintenance of deep groove ball bearings

Since the reform and opening up, as we joined the WTO and gradually emerged from the international competition, China's bearing industry has been developing stably and rapidly.

According to the annual report of the National Bureau of Statistics, in 2004, the national bearing industry and state-owned holding enterprises and the non-public enterprises with annual sales of more than 5 million yuan have reached 927. In 2003, the bearing output of the whole industry was 4.1 billion sets, and the bearing sales revenue was 39.2 billion yuan. China's bearing sales have jumped to the fourth place in the world, becoming the world's largest bearing production country. In particular, miniature and small deep groove ball bearings have become the world's most productive countries.

As a kind of sub-class of bearings, deep groove ball bearings are widely used in modern equipment manufacturing industry because of their wide application and long service life. The processing precision and quality of equipments have been greatly improved. It can be said that deep groove ball bearings In the future equipment installation will be a large number of applications, and its market prospects will be broader.

The wide application of deep groove ball bearings has benefited from the common understanding of the majority of equipment workers, and has been accepted by everyone for its excellent performance. I have been engaged in the maintenance and repair of mechanical equipment for many years. I have contacted deep groove ball bearings in many aspects, and I have a lot of understanding about its installation, use and maintenance. I have summarized some experiences and discussed with you.

Overview

Deep groove ball bearings generally consist of a pair of ferrules, a set of rigid balls and a set of cages. The deep groove ball bearing type code is 6. It is the most common and widely used type of bearing. Deep The groove ball bearing has simple structure and convenient use, and is the largest in production batch and bears a certain axial load. When the radial clearance of the bearing is increased, the function of the angular contact ball bearing can withstand large axial load.

Deep groove ball bearings are mainly used to withstand pure radial loads, and can also withstand radial loads and axial loads. When they are only subjected to pure radial loads, the contact angle is zero. When the deep groove ball bearing has large radial clearance, it has the performance of angular contact bearing and can withstand large axial load. The deep groove ball bearing has a small friction coefficient and the limit rotation speed is also very high, especially in Deep groove ball bearings are more advantageous than thrust ball bearings under high-speed operating conditions with large axial loads. Compared with other types of bearings of the same size, such bearings have small friction factor and high limit speed. In the case of a thrust ball bearing, the bearing can be subjected to axial load. After the deep groove ball bearing is mounted on the shaft, the axial displacement of the shaft or the outer casing can be limited to the axial clearance of the bearing. Meanwhile, when the outer casing When the hole and the shaft (or the outer ring to the inner ring) are relatively inclined, (not more than 8-16 according to the clearance) can still work normally. However, if there is a slope, it is necessary to reduce the bearing life.

Compared with other bearings of the same size, deep groove ball bearings have the lowest friction loss and high limit speed. In the case of high speed and should not be used with thrust ball bearings, such bearings can be used to withstand pure axial loads. Accuracy, and the use of bakelite, bronze, hard aluminum and other materials of the physical cage, its speed can also be improved.

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