No. 1 Beiting Yao Road, Ganyao Town, Jiashan County, Zhejiang Province

Methed of Wrapped Bushes Measurement

  • Common test method of outside diameter(ISO3547-2:PIN 1444-2 Testing method B)

    Press the bushes into the GO ring gauge and then push them through with hand pressure(maximum force 250N)

    On the other hand with the same forceIt shall not be possible for them to go into the NOGO ring gauge

  • Common test method of inner diameter test(ISO3547-2:PIN 1444-2 Testing method C)

    To check the inner diameter, the bush is to be press into a ring gauge. The GO plug gauge shall be inserted by a minimum effort, The NOGO Plug gauge shall not be insert by mutual pressure(maximum force 250N)

    (Note: When the bush is pressed into the ring gague, It is possible that There will be a permanent reducation in the outside diameter)

  • Common method of wall thickness measurement

    Check the wall thickness of the bush with a wall thickness micrometer and then calculate out the inside diameter. According to ISO3547-2 make sure not to both mark the wall thickness and inside diameter on the drawing.

Bearing Selection

THREE STAR BEARING have developed kinds of bearing material According to difference work condition. The user can select the material the material base on bearing work environment, load, speed, wear resistance resistance requst, moving method, etc.

Bearing Load

Cylidrncal bushes, flange bushes

P= F
d×L (N/mm²)

F=Load (N)

d=Shaft(mm)

L=Bearing Length(mm)

Thrust washer

P= 4F
π(D²-d²) (N/mm²)

F=Load (N)

d=Shaft(mm)

L=Bearing Length(mm)

As the factor of clearance, bushes chamfer, oil groove etc., The actually load (P) is higher than theory of calculation(P)

Bearing Selection

Rotating motion

V= π×d×n
1000×60 (m/s)

d=Shaft(mm)

n=Rpm

Oscillating motion

V= π×d×C×θ
1000×360×60 (m/s)

d=Shaft(mm)

C=frequency

θ=Oscillating angle

Rotating motion

V= 2s×c
60 (N/mm²)

s=Stoke distance(m)

c=frequency

PV=P×V(N/mm² ×m/s)

THREE STAR BEARING have developed kinds of bearing material According to difference work condition. The user can select the material the material base on bearing work environment, load, speed, wear resistance resistance requst, moving method, etc.

Installation Precautions

  • 1. Fixing methods for straight bearings

    Diameter of the pressing-in arbor is 0.1~0.3 mm smaller than the after-fixing diameter of the bearing. It’s better to have the core axis heat-treated. For easier fixing,we can add a light coating of oil on the bush backing. Make sure not to fix the bearing into the housing by hammering its end surface. When the diameter of the bearing is more than 55mm, necessary measures must be taken to calibrate the seam position of bearing.

  • 2. Fixing methods for flanged bearings

    For flanged bearings, the radius at the transition from the radial to the axial component must the flanged folds must be taken into account. A sufficiently large chamfer must be provided on the housing to prevent flanged bush fouling in the area of the radius. Fixing methods for the flanged bearings are similar to that of straight bearings.However, the diameter of the convex part on the pressing-in arbor for flanged bearings needs to be a little bigger.

  • 3. Fixing methods for thrust washers and gliding plate

    We recommend using a single dowel or countersunk head screw to fix the thrust washer. For the gliding plate we recommend adopting the methods of enchasing. When fix the thrust washer or the gliding plate, the sliding layer shall be 0.3~0.5mm thick.

Bearing and shaft fit requirements

The performance of the self lubricated bearings is largely influenced by the surface roughness and hardness of the material. High quality shaft surface can extend the bearing life. In contrast to rough, low hardness of the surface, reduce the bearing life.

  • A Axis surface roughness

    1.Under the condition of fluid lubrication, the surface of the shaft is required to make the mirror surface, ao as to reduce the gap of the oil film, and make it close to the fluid lubrication state, so as to improve the performance of the bearing.

    2.Bearing in dry friction conditions, as long as the control of the surface roughness of the Ra=0.4-063 range.

  • B Shaft hardness

    The surface hardness of the shaft is not less than 220HB. In high load and rolling motion condition, it is necessary heat treatment of the shaft with the hardness of HRC50 or hard chromium plating, and then grinding, after surface treatment, can improve the corrosion resistance, improve the surface hardness, improve the lubrication. If in the middle of the sea water is similar to the corrosion conditions, the matching shaft must be two to three layers of hard chromium plating.

    The surface of the shaft, sharp burrs, rough grooves will damage the bearing sliding layer.

Bearing and bearing seat of the matching qeruirements

  • A Hole chamfering

    • 1.Straight sleeve bearing seat hole requirements: Match the seat hole corresponding to the chamfer.

      Hole diameter

      <30

      30~80

      80~180

      >180

      The corresponding chamfer

      0.8±0.3×20°±5°

      1.2±0.4×20°±5°

      1.8±0.8×20°±5°

      2.5±1.0×20°±5°

    • 2.The bearing seat hole flanging match, seat hole requirements provide a large enough to prevent the chamfer, flanging radius of deformation.

      Hole diameter

      <10

      >10

      The corresponding chamfer

      1.2±0.2×45°±5°

      1.7±0.2×45°±5°

  • B Bearing seat diameter requirements

    Bearing bore diameter with tolerance, H7 tolerance

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