angular contact ball bearing type 70000, by the outer ring, inner ring and ball and cage. can bear radial load and axial load at the same time, also can withstand pure axial load, can work stably under high speed. single row angular contact ball bearings can only carry axial load in one direction. such bearings under pure radial load, due to the rolling element load action line with radial load is not the same radial plane, produce internal axial force component, so must be installed in pairs.
1. the single row angular contact ball bearing single row angular contact ball bearing has the following structure:
(1) the separation type angular contact ball bearings
this kind of bearing, code-named s70000, the outer ring then no lock, can with the inner ring, cage, steel ball component separation, thus it can be installed separately. such are the miniature bearing inside diameter less than 10 mm, used in gyro rotor, micro motor and other stability of dynamic balance, noise, vibration, there are higher requirements of the device.
(2) the separation type angular contact ball bearings
this kind of bearing ring channel lock mouth, so the two ring cannot be separated. according to the contact angle is divided into three types:
1) contact angle alpha = 40 °, is suitable for large axial load;
(2) the contact angle of alpha = 25 °, used for precision spindle bearing;
(3) contact angle alpha = 15 °, usually for large size precision bearing.
(3) the configuration of the angular contact ball bearing in pairs
configuration of angular contact ball bearing in pairs used to bear radial load and axial load at the same time, also can withstand any pure radial load and direction of axial load. these bearings by the manufacturer in accordance with the requirements of certain pre-load optional combination in pairs, provided to the users. when the bearing is installed on the machine after fastening, completely eliminate the clearance of the bearing, and makes the ring and steel ball in the preloaded state, thus increasing the rigidity of composite bearing.
configuration of angular contact ball bearing in pairs there are three kinds of different configuration types:
(1) the configuration back to back, rear code-named db (such as 70000 / db), the configuration of good rigidity, under negative moment performance is good, the bearing can be subject to bi-directional load;
(2) face-to-face configuration, rear code-named df (such as 70000 / df), the configuration of the rigidity and the ability to withstand the overturning moment than the db configuration forms, the bearing can be subject to bi-directional load;
(3) series configuration, rear code-named dt (such as 70000 / dt), this configuration can also be in the same series of three or more bearing support, but can only carry axial load in single direction. usually, in order to balance and limit shaft axial displacement, another supporting point should be installed to withstand another direction axial load bearing.
in addition, there is a kind of available for arbitrary pairs of single row angular contact ball bearings. this kind of bearing through special processing, can two back to back, face to face or two series, such as arbitrary combinations, pairs of axial clearance can choose according to need, rear code ca axial clearance is small, cb said moderate axial clearance, cc said axial clearance is bigger.
universal paired bearings, also can be configured according to the requirements of using bearing, in the process of the interference and later buy code ga, gb, gc said. after ga said matching preloaded; smaller gb said after pairing preloaded; medium gc said after matching large interference.
2. double row angular contact ball bearing
the characteristics of double row angular contact ball bearing can be also bear the combined load of radial and axial load, limit shaft of both axial displacement.
compared with bidirectional thrust ball bearing, this kind of bearing limit rotational speed is higher, the contact angle is 32 °, good rigidity, affordable overturn torque, widely used in the car of the front wheel hub (some models with same size also double row circular cone roller bearings).
the structure of double row angular contact ball bearing variant has four kinds:
(1) type a standard design of bearing outside diameter less than or equal to 90 mm. no ball gap, so can bear equal two-way axial load. using light glass fiber reinforced nylon 66 cage, bearing temperature rise is small.
(2) the standard design of the bearing type a diameter greater than 90 mm. side with ball gap, equipped with steel plate stamping cage or entity brass cage.
(3) e reinforced structure, the side with the ball gap, can hold more ball, therefore higher bearing capacity.
(4) sides with dust cover and with seals on both sides of type a and type e design on both sides of double row angular contact ball bearings can take dust cover (non-contact) or sealing ring (contact). the interior of the sealed bearing are filled with rust lithium base grease, operating temperature in general - 30 ~ + 110 ℃. don't need to lubrication during use, before installation should not be heating, should not be clean.
double row angular contact ball bearing should be paid attention to when installation, although the bearing can be subject to bi-directional load, but if one side has put the ball gap, should be paid attention to, don't let the noise of main axial load through a gap on one side of the river bank.
