What is the connection between the shaft and the bearing, and what is the fit between the shaft and

Shaft and bearing fit:

1) The bearing fit is generally a transition fit, but in special cases, interference fit can be selected, but rarely;

2) Because the bearing is matched with the shaft, the inner ring of the bearing is matched with the shaft, and the base hole system is used, and the bearing should be completely aligned with zero.

We can also think of this in actual use, but in order to prevent the inner ring from rolling and damaging the surface of the shaft when the minimum limit size of the bearing inner ring is matched with the shaft, our bearing inner ring has a downward deviation tolerance of 0-several um to ensure that the inner ring does not rotate, so the bearing generally chooses the transition fit, even if the transition fit is selected, it can not exceed the interference of 3 wires;

3) Match the accuracy of the grade of the shirt to choose 6 grades, sometimes it also depends on the material, as well as the processing technology, theoretically the 7 level of accuracy is a bit low, 5 levels of cooperation to use grinding;

Zhishi 4) the general selection is: the inner ring of the bearing and the shaft fit, the shaft selection K6; <>

The fit between the shaft and the bearing is generally based on the form and direction of the load, and several forms of transition or interference and clearance fit are adopted.

The shaft will generally have a shoulder, after the bearing is installed, the end face of the inner ring will be in direct contact with the shoulder, and the axial sailing banquet will be carried out by the simple car with the shoulder of the shaft, and the other side will be positioned by the shoulder of the retaining ring to support the other side. State command silver.

In general, the fit of the bearing with the shaft should be a transition or interference fit.

The fit between the shaft and the bearing refers to the dimensional relationship between the shaft and the inner ring of the bearing, and between the outer ring of the bearing and the housing hole. Generally speaking, the fit between the bearing and the shaft should be selected as a transition or interference fit to prevent relative sliding; The fit between the outer ring of the bearing and the housing bore should be selected as a clearance or transition fit for easy installation and disassembly.

Bearings and fittings, radial bearings, angular contact ball bearings, tapered roller bearings, etc. Tapered roller bearings are a type of split bearing that can withstand radial and unidirectional axial loads. It consists of an inner ring, an outer ring, rollers, and a cage.

The M6 tolerance zone is an interference fit that applies to the fit of the inner ring of the bearing to the shaft. It prevents relative sliding, improves turning accuracy, and adapts to temperature changes.

Performance characteristics of tapered roller bearings:

1.The speed is slippery, rigid, and resistant to shock and vibration.

2.It can withstand large axial loads and radial loads.

3.Detachable and interchangeable parts allow for easy installation, removal, and maintenance.

4.The larger the contact angle, the stronger the axial load capacity. <>

Fit of shaft and bearing: (1) Bearing fit is generally a transitional fit, but interference fit can be selected in special cases, but rarely; (2) Because the bearing and the shaft are matched with the inner ring of the bearing, the base hole system is used, the bearing should be completely zero, we can also think so in actual use, but in order to prevent the inner ring of the bearing from rolling when the minimum limit size of the shaft is matched, the surface of the shaft is damaged, so our bearing inner ring has a downward deviation tolerance of 0-a few um to ensure that the inner ring does not rotate, so the bearing generally chooses to transition with Lu Youtanghe on it, Even if the transition fit is selected, the interference of 3 filaments should not be exceeded; (3) The matching accuracy grade is generally selected 6 grades, sometimes it also depends on the material, as well as the processing technology, theoretically the 7 level accuracy is a bit low, and the 5 level of cooperation will be used to grind; (4) The general selection is: the inner ring of the bearing is matched with the shaft, and the shaft is K6;

Outside? Hole? , hole selection K6 or K7 shaft and pulley with the matching trapping:

The gap between the motor shaft and the pulley is matched, and then the positioning key is added, if it is over-matched, the motor shaft will heat and expand and damage the pulley, so there must be a gap!

The connection methods of gears and shafts include gear shafts, spline connections, general key connections, and ratchet mechanisms.

1. a gear shaft. The gear and shaft are made into a whole, and Huishan is combined;

2. Spline connection. The spline connection consists of an inner spline and an outer spline. The inner and outer splines are multi-tooth parts, the splines on the inner cylindrical surface are internal splines, and the splines on the outer cylindrical surface are external splines;

3. General key connection. The general key connection is to realize the circumferential fixation between the shaft and the gear through the key to transmit the motion and torque;

4. There is also a mechanism like a ratchet mechanism, which can realize one-way rotation, and when it is reversed, it will be separated from the state.

The gears are fixed at the end of the shaft in the following ways:

1. Circumferential fixation: used to transmit torque between the inner bore of the gear and the shaft. The most commonly used circumferential fixation anterior trace is a flat key, usually a single key, and a double bond is used when the force is large. For some pinions with little force, the steps can also be machined and fixed with screws.

2. Axial fixation: mainly to limit the axial movement of the gear, between the gear and other parts by using a spacer or machining a step on the shaft for positioning. A gear is a mechanical element with teeth on the rim that can continuously mesh to transmit motion and power. <>

1.The connection mode of the gear transmission shaft is generally key connection, flat key or spline connection, the traditional structure of the transmission shaft telescopic sleeve is to weld the spline sleeve and the flange fork together, the spline shaft is welded on the transmission shaft tube, the new type of transmission shaft changes the traditional structure, the spline sleeve and the transmission shaft are welded into one spline shaft and flange fork into one, the transmission shaft is a high speed, less support of the rotating body, the general transmission shaft must be tested for dynamic balance before leaving the factory, and adjusted on the balancing machine, For front-engine, rear-wheel drive cars, the rotation of the transmission is transmitted to the shaft of the final reducer, which can be several sections, and the joints can be connected by universal joints;

2.The transmission shaft is composed of a shaft tube, a telescopic sleeve and a universal joint, the telescopic sleeve can automatically adjust the change of the distance between the transmission and the drive axle, the universal joint is to ensure the change of the angle between the two axes of the transmission output shaft and the input shaft of the drive axle, and realize the constant angular transmission of the two shafts, the universal joint is the key component on the transmission shaft of the car, the car is an object that stops the movement, in the rear drive car, the engine, clutch and transmission are installed on the frame as a whole, and the drive axle is connected with the frame through elastic suspension, There is a distance between the two that needs to be connected.

Summary. This mounting method is suitable for angular contact ball bearings and tapered roller bearings. The ball screw is equipped with a special bearing for the screw with a contact angle of 60 degrees. The accuracy of the middle spacer ring is very high, and if there is an old spacer ring, it is best to use the old one properly.

2. For the new spacer ring machining, the required rotation accuracy, preload, and internal clearance should be calculated in detail, and the size and dimensional accuracy of the spacer ring should be obtained according to the calculation results. Single row angular contact ball bearings can only withstand axial forces in a single direction.

3 In order to be able to withstand bidirectional axial forces, or to increase axial forces in a single direction, at least two single row bearings need to be used together. db: Back-to-back combinations.

4 The most commonly used combination can withstand axial forces in both directions. DF: Face-to-face combination. It can withstand axial forces in both directions, and is suitable for long shafts, or shafts with some deflection.

5 dt: tandem combination. It can only withstand axial forces in a single direction, but it is much larger than a single row bearing. There are also three-column and four-column combinations. However, in these combinations, the bearings are generally directly placed together, and there is no spacer ring in the middle.

How the two bearings fit together is the right one.

This mounting method is suitable for angular contact ball bearings and tapered roller bearings. The ball screw is equipped with a special bearing for the screw with a contact angle of 60 degrees. The accuracy of the middle spacer ring is very high, and if there is an old spacer ring, it is best to use the old one properly.

2. For the new spacer ring processing, the required rotation accuracy, the disadvantages of the preloader, and the internal clearance elimination should be calculated in detail, and the size and dimensional accuracy of the spacer ring should be obtained according to the calculation results. Single row angular contact ball bearings can only withstand axial forces in a single direction. 3 In order to be able to withstand bidirectional axial forces, or to increase axial forces in a single direction, at least two single row bearings need to be used together.

db: Back-to-back combinations. 4 The most commonly used combination can withstand axial forces in both directions.

DF: Face-to-face combination. It can withstand axial forces in both directions, and is suitable for long shafts, or shafts with some deflection.

5 dt: tandem combination. It can only withstand axial forces in a single direction, but it is much larger than a single row bearing.

There are also three-column and four-column combinations. However, these combinations are generally carried out directly by the axes and the families are directly together, and there is no spacer in the middle.

That's how to do it.

Hope mine is helpful to you, thanks.