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Introduction of Basic Elements of Purchasing INA Rolling Bearing
Jan 11, 2018

选购INA滚动轴承基本要素介绍

Introduction of Basic Elements of Purchasing INA Rolling Bearing

在进行新主轴设计时,选择INA轴承之前,先考虑主轴性能参数,大致确定最关键的性能,再进入进一步的探计。(包括:主轴速度,主轴精度,主轴刚性,主轴寿命,主轴发热,主轴可靠性)

In the new spindle design, before selecting the INA bearing, consider the main shaft performance parameters, roughly determine the most critical performance, and then enter the further probe. (including: spindle speed, spindle precision, spindle rigidity. Spindle Life, Spindle heating, Spindle Reliability)
决定了主轴参数之后,探计主轴的实际尺寸(轴径、长度、轴承跨度)。

After determining the spindle parameters , the actual dimensions of the spindle of the gauge ( shaft diameter , length , bearing span ) are determined .
根据轴承形式(球或圆柱滚子轴承),配列(配列数),驱动方式(传动带、齿轮、电机、内装电机),润滑(油脂、油气、油雾、喷射)等主轴参数的设定来确定其结构。

According to the form of bearing (ball or cylindrical roller bearing), matching (matching number of rows, driving mode (belt, gear, motor, inside motor), lubrication (grease, oil and gas, oil mist). The main shaft parameters such as jet are set to determine its structure.
1、轴承径向载荷

1, Radial load of bearing
主要承受径向载荷的INA轴承为向心轴承。这类轴承的公称接触角a0<=450。尺雨相同的滚子轴承比球轴承能承受的径向载荷更大。

The INA bearings , which are mainly subjected to radial loads , are radial bearings . The nominal contact angles of this type of bearings are 0 450 . The same roller bearings as the ball bearings are larger than the radial loads that the ball bearing can bear
N型和NU型圆柱滚子轴承只能承受径向载荷,其它类型的向心轴承既可承受径向载荷,也可以承受轴向载荷。

The N-type and NU-type cylindrical roller bearings can only bear radial loads, while other types of radial bearings can bear both radial and axial loads.

2、轴承的轴向载荷

2. Axial load of bearing
主要承受轴向载荷的轴承一般为推力轴承,它的公称接触角落a0>450。推力轴承和推力角接触球轴承根据结构不同可以同时承受一个或两个方向的轴向力。当承受向力特别高时优选用推力圆柱滚子轴承和推力调心滚子轴承。

The main bearing bearing bearing axial load is thrust bearing. Its nominal contact corner a0 > 450. Thrust bearings and thrust angular contact ball bearings can bear one or two directions of axial force simultaneously according to the structure. When the bearing force is especially high, the optimum selection of thrust cylindrical roller. Bearings and thrust centering roller bearings.
推力调心滚子轴承和单向推力角接触球轴承可以同时承受轴向载荷和径向载荷,其它推力轴承只能承受轴向载荷。

Thrust roller bearings and thrust angular contact ball bearings can withstand axial load and radial load, thrust bearings can withstand axial load other.
3、轴承自身的长度补偿

3. Length compensation of bearing itself
支承一根轴和轴承通常采用固定轴承和游动轴承组合的结构。游动INA轴承补偿轴的长度误差和热膨胀。

The structure of supporting a shaft and bearing is usually a combination of a fixed bearing and a swimming bearing. The length error and thermal expansion of the compensating shaft of the INA bearing.
NU型和N型圆柱滚子轴承是理想的游动轴承,这些轴承自身可以对长度进行补偿。轴承内外圈可以用紧配合。

NU-type and N-type cylindrical roller bearings are ideal swimming bearings, which can compensate for the length themselves. The inner and outer rings of the bearings can be tightly matched.
4、滑动配合的长度补偿

4. Length compensation for sliding coordination
不可分离轴承也可作游动轴承。这类轴承两个套圈中的一个采用配合,没有轴向固定面。因此,轴承的一个套圈可以在其支承面上活动。

The non separable bearing can also be used as a swimming bearing. One of the two rings of this kind of bearing is fitted with no axial fixed surface. Therefore, a ring of the bearing can move on its supporting surface.
确定精密轴承尺寸、种类之后,考虑轴承的具体设计。

After determining the size and type of precision bearing, consider the specific design of bearing.
充分考虑轴承疲劳寿命、刚性、发热等因素,选择最适当的轴承游隙(预负荷)。

Taking full consideration of the bearing fatigue life, rigidity, heating and other factors, choose the most appropriate bearing clearance (pre load).
由于轴承游隙和预负荷,对INA轴承性能最为关键,越是高速运转时越显得关键、所以必须慎重考虑。选择不当时,还会发生早期破损或烧结等问题。有必要从第4步到第3步,或从第4步到第2步,反复考虑。

Because of bearing clearance and preload, INA bearing performance is the most critical, the more high speed operation is more critical, so we must carefully consider. Problems such as early breakage or sintering may occur. It is necessary to reconsider from step 4 to step 3, or from step 4 to step 2.
确定主轴结构设计之后,要考虑实际安装时的必要条件。

After the design of the spindle structure is determined, it is necessary to consider the necessary conditions for the actual installation.

高精密轴承的安装轴及轴承座的精度、公差配合、安装固定所需的紧定螺母的拧紧力、实际安装之后的INA轴承预负荷及内部游隙的确认。

The accuracy, tolerance and coordination of the installation shaft and bearing seat of high precision bearings, tightening force of fastening nuts for fixing and fixing, confirmation of INA bearing preload and internal clearance after actual installation are confirmed.