JB/T 5303-2019Rolling bearings - Supplementary designs of insert bearing units - Boundary dimensions (English PDF)

4.1 General

For the purposes of this document, the symbols given in GB/T 7811-2015, Sub-clause 4.2 to 4.6 in this standard and the following apply.

The symbols (except those for tolerances) shown in Figures 1 to 20 and the values given in Tables 1 to 7 denote nominal dimensions unless specified otherwise.

Note: Figures 1 to 20 are drawn schematically and do not necessarily show all structural details. The grease nipple positions in Figures 1 to 20 are examples. Other positions are at the discretion of the manufacturer.

B: Width of inner ring of bearing units

B1: Overall width of inner ring of bearing units including eccentric locking collar

B3: Width of adapter sleeve d: Bore diameter of bearing units and of eccentric locking collar d0: Bore diameter of adapter sleeve

S: distance from centre of raceway to face of inner ring on side opposite locking device.

4.2

Bearing units with highly centered plummer block housings and bearing units with narrow plummer block housings

A: (pverall) width of base

H: distance from the mounting base to the center of the spherical diameter;

H0: height(total height);

J: center distance between bolt holes

L: (overall) length of base

4.3 Bearing units with adjustable oval housinga, bearing unita with light oval housings

A: (overall) height

A2: the distance from the mounting base to the center of the spherical diameter;

H: height of flange

J: center distance between bolt holes

L: (overall) width.

4.4 Bearing units with suspended housings

A: (overall) height

A2: distance from the mounting base to the center of the spherical diameter;

H0: height of flange

L: (overall) width.

4.5 Bearing units with overhung housings

C: horizontal distance from the center of the spherical diameter to the axis of the overhung screw hole;

H: distance from the center of the spherical diameter to the top of the suspension;

H0 (overall) height;

L: (overall) width.

4.6 Bearings with flanged square housing

A: (overall) height

A2: distance from the center of the spherical diameter to the mounting base;

D1: flanged diameter;

J: center distance between bolt holes

L: (overall) length.

7.1 General

Where “max.” is shown in Tables 1 to 7, this indicates that the value is both the nominal value and the largest actual value permitted. Where “min.” is shown in Tables 1 to 7, this indicates that the value is both the nominal value and the smallest actual value permitted.