Bearing assembly and rotary shaft apparatus employing same

A rotary shaft apparatus, comprising:

• a first shaft;
• a second shaft connected with the first shaft;
• and
• a bearing assembly for rotatably coupling with the first shaft and the second shaft, wherein the bearing assembly comprises:
• a first bearing housing comprising a first annular recess, wherein the first annular recess has a first axial depth;
• a first bearing, wherein one end of the first bearing is connected with the first annular recess of the first bearing housing, the other end of the first bearing is connected with the first shaft, and the first bearing has a first axial thickness;
• a second bearing housing comprising a second annular recess, wherein the second annular recess has a second axial depth, and a bearing housing gap with an axial width is formed between the first bearing housing and the second bearing housing;
• a second bearing, wherein one end of the second bearing is connected with the first annular recess of the first bearing housing and the second annular recess of the second bearing, the other end of the second bearing is connected with the second shaft, and the second bearing has a second axial thickness;
• and
• a spacer disposed between the first bearing and the second bearing, wherein the spacer has a third axial thickness;
• wherein the sum of the first axial thickness, the second axial thickness and the third axial thickness is greater than the sum of the first axial depth and the second axial depth.