【Daily Question: Pump Equipment】Short Answer Question, 3/4/2019
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bk14.jpg Rules for short-answer questions: 1. If the answer is incorrect, +2 wealth will be given for active participation; if the answer is somewhat reasonable but not specific enough, +5 wealth will be given; if the answer is correct, +8 wealth will be given. 2. Rewards for answers are available once per person only. 3. Each reply allows scoring for only one person. 4. The answer and its explanation will be visible after responding. 5. The reward is valid for 48 hours; no reward will be given if the deadline is exceeded. The student has won another award; come by here every day. On a certain pump diagram, the rolling bearing is marked as “7311B/DB” – what does this mean? Answer: 7311 — Single-row angular contact ball bearing, outer diameter 120mm, inner diameter 55mm, width 29mm ； B – The bearing contact angle is 40 degrees (the larger the contact angle, the greater the capacity to withstand axial loads) ； DB — two single-column bearings mounted back to back (face-to-face mounting DF, series mounting DT)
Angular contact ball bearing, inner diameter 55mm
Back-to-back paired double angular contact ball bearings
Angular contact ball bearing. Bearing thickness: 58. Bearing inner diameter: 55. Bearing outer diameter: 120
Pair of back-to-back angular contact ball bearings
7-angular contact ball bearing, 3-size series code, 11-inner diameter of 55mm, B-bearing contact angle of 40 degrees, DB-back-to-back installation
It is a angular contact ball bearing, with the bearing model being 7311B/DB
7311: Single-row angular contact ball bearing, outer diameter 120mm, inner diameter 55mm, width 29mm； B: The bearing contact angle is 40 degrees (the larger the contact angle, the greater the capacity to withstand axial loads). DB: Two single-row bearings are installed back to back
Angular contact ball bearings installed back to back in pairs, with a contact angle of 40°
7311: Single-row angular contact ball bearing, inner diameter 55mm； Two single-row bearings with a B contact angle of 40 degrees/DB are installed back to back