Double row cylindrical roller bearings

描述

Basic bearing design
Multiple IMCB basic design double row cylindrical roller bearings with different designs are available. The main design differences between bearings are the inner and outer ring retaining edges, as well as the design and material structure of the cage. The most commonly used designs are:
Bearing design, edge arrangement, retaining frame design
NNU type

Outer ring: Three integral pieces
Inner circle: None
A holder
Machine cut brass or machine cut steel
Double fork type machining cage
Roller centering
NNU. 1 type

Outer ring: Three integral pieces
Inner circle: None
Two retainers
Machining brass
Window Type
Roller centering
NNU. 2 type

Outer ring: one integral and two movable
Inner circle: None
A holder
Machine cut brass or machine cut steel
Double fork type machining cage
Roller centering
NNU. 3 type

Outer ring: Three integral pieces
Inner circle: None
Two retainers
Machined steel
Selling style
Perforated roller
NNU. 4 type

Outer ring: one integral and two movable
Inner circle: None
Two retainers
Machined steel
Selling style
Perforated roller
NNU. 5 type

Outer ring: Two integral parts
Inner circle: None
A holder
Machining brass
Window Type
Roller centering
NNU. 6 type

Outer ring: Two integral parts
Inner circle: None
A holder
Machined steel
Selling style
Perforated roller
NNU. 7 type

Outer ring: one integral and one movable
Inner circle: None
A holder
Machining brass
Window Type
Roller centering
NNUB type

Outer ring: Three integral pieces
Extended inner circle: None
A holder
Machine cut brass or machine cut steel
Double fork type machining cage
Roller centering
NNUB.1 type

Outer ring: one integral and two movable
Extended inner circle: None
A holder
Machine cut brass or machine cut steel
Double fork type machining cage
Roller centering
NNUB. 2 type

Outer ring: Two integral parts
Extended inner circle: None
A holder
Machining brass
Window Type
Roller centering
NNUB.3 type

Outer ring: Two integral parts
Extended inner circle: None
A holder
Machined steel
Selling style
Perforated roller
NNUB.4 type

Outer ring: Three integral pieces
Extended inner circle: None
Two retainers
Machining brass
Window Type
Roller centering
NNUB.5 type

Outer ring: one integral and two movable
Extended inner circle: None
Two retainers
Machined steel
Selling style
Perforated roller
NNUP type

Outer ring: Three integral pieces
Inner circle: one integral and two movable
A holder
Machine cut brass or machine cut steel
Double fork type machining cage
Roller centering
NNUP. 1 type

Outer ring: two integral and one movable
Inner circle: one integral and one movable
Two retainers
Machined steel
Selling style
Perforated roller
NN type

Outer Ring: None
Inner circle: Three integral parts
A holder
Machine cut brass or machine cut steel
Double fork type machining cage
Roller centering
NN.1 type

Outer Ring: None
Inner circle: Three integral parts
Two retainers
PA66 or stamped steel
Window Type
Roller centering
NN.2 type

Outer Ring: None
Inner circle: Three integral parts
Two retainers
Machined steel
Selling style
Perforated roller
NN.3 type

Outer Ring: None
Inner circle: one integral and two movable
Two retainers
Machined steel
Selling style
Perforated roller
Type/Characteristics
If double row cylindrical roller bearings are to be installed on shafts or support rollers and adopt clearance fit (such as allowing quick roller replacement), one or more additional functions can be provided () to compensate for the drawbacks of clearance fit. The spiral groove in the hole and/or the lubrication groove on the side of the bearing ring provide effective lubrication for the sliding contact surface.
Bearings equipped with one or more of these functions are identified in the model/feature (product table) as follows:
G inner ring hole with spiral groove
K-round taper hole
=The taper of K is 1:12
=The taper of K30 is 1:30
Lubrication groove on the side of W bearing ring
WI inner ring side with lubrication groove
WO outer ring side with lubrication groove
W20 outer ring lubrication hole
W33 outer ring with annular groove and oil injection hole
Paired bearings
Combined together, the difference in cross-sectional height of the bearings used in paired bearings is within a very small tolerance range
The prerequisite for reducing tolerance is to narrow the tolerance zone.
The following combinations are available:
Two bearing groups (model suffix DR)
Three bearing groups (model suffix TR)
Four bearing groups (model suffix QR)