在精密机床等机械设备中，通常对轴承的精度要求会特别高，所以大多都会采用轴承，而大多数情况下，为了保证轴承的刚性和精度，都会对轴承进行预紧，那么您知道轴承的定位与定压预紧的区别是什么吗？下面导轨丝杠厂家为您分析：

In precision machine tools and other mechanical equipment, the accuracy requirements of bearings are usually very high, so most of them will use bearings. In most cases, in order to ensure the rigidity and accuracy of bearings, bearings will be preloaded. Do you know the difference between bearing positioning and constant pressure preloading? The following guide screw manufacturer will analyze for you:

1、径向预紧法

1. Radial preload method

径向顶紧法多使用在承受径向负荷的轴承中，利用螺母调整轴承相对于轴颈的轴向位置，使内圈有合适的膨胀量而得到径向负游隙，这种方法多用于机床主轴中。

The radial jacking method is mostly used in bearings bearing radial load. The nut is used to adjust the axial position of the bearing relative to the journal, so that the inner ring has an appropriate amount of expansion to obtain radial negative clearance. This method is mostly used in machine tool spindles.

2、轴向预紧法

2. Axial preloading method

轴向预紧法大体上可分为定位预紧和定压预紧两种：

The axial preloading method can be divided into two types: positioning preloading and constant pressure preloading:

（1）定位预紧

(1) Positioning preload

在定位预紧中，可通过调整衬套或垫片的尺寸，获得合适预紧量；也可通过测量或控制起动摩擦力矩来调得合适的预紧；还可直接使用预先调好预紧量的轴承来实现预紧的目的，此时一般不需要再行调整，凡是经过轴向预紧的轴承，使用时其相对位置肯定不会发生变化。

In the positioning preload, the appropriate preload can be obtained by adjusting the size of the bushing or gasket; Appropriate preload can also be adjusted by measuring or controlling the starting friction moment; You can also directly use the bearing with pre-adjusted preload to achieve the purpose of preloading. At this time, it is generally unnecessary to adjust again. The relative position of the bearing with axial preload will not change during use.

（2）定压预紧

(2) Constant pressure preload

定压预紧是用螺旋弹簧、碟形弹簧等使轴承得到合适预紧的方法。预紧弹簧的刚性—般要比轴承的刚性小得多，所以定压预紧的轴承相对位置在使用中会有变化，但预紧量却大致不变。

Constant pressure preloading is a method to preload the bearing properly by using spiral spring, belleville spring, etc. The rigidity of the preload spring is generally much smaller than that of the bearing, so the relative position of the bearing with constant pressure preload will change in use, but the preload is roughly the same.

轴承的定位预紧与定压预紧的区别，如下：

The difference between positioning preload and constant pressure preload of bearing is as follows:

（1）在预紧量相等时，定位预紧对轴承刚性增加的效果较大，而且定位预紧时刚性变化对轴承负荷的影响也小得多。

(1) When the preload is equal, the effect of positioning preload on the increase of bearing rigidity is greater, and the effect of rigidity change on bearing load is much smaller when positioning preload.

（2）定位预紧在使用中，由于轴和轴承座的温度差引起的轴向长度差，内外圈的温度差引起的径向膨胀量以及由负荷引起的位移等的影响，会使预紧量发生变化；而定压预紧在使用中，预紧的变化可忽略不计。

(2) During the use of positioning preload, the preload will change due to the axial length difference caused by the temperature difference between the shaft and the bearing seat, the radial expansion caused by the temperature difference between the inner and outer rings, and the displacement caused by the load; In use, the change of preload can be ignored.

以上就是为大家整理的轴承的定位与定压预紧的区别，经过预紧的轴承即使承受较大载荷也不会发生较大变形，对延长其使用寿命是十分有利的。您还有什么疑惑或者需求就来我们网站http://www.jngongrun.com进行咨询了解吧！

The above is the difference between bearing positioning and constant pressure preloading. The preloaded bearing will not deform even if it bears a large load, which is very beneficial to extending its service life. If you have any doubts or needs, please come to our website http://www.jngongrun.com Consult and understand!