LUOYANG MONTON BEARING SCIENCE & TECHNOLOGY CO.,LTD.
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RU42UUCC0P5 20*70*12mm slim crossed roller bearing for Zero Backlash Harmonic Gear Actuator Cycloidal Robot

RU42UUCC0P5 20*70*12mm Slim Crossed Roller Bearing For Zero Backlash Harmonic Gear Actuator Cycloidal Robot

Reference FOB Price:
US1 ~ 1000 / Piece
Min. Order:
1 Piece
Stock:
1000 Piece
Production Capacity:
luoyang
Port:
Shanghai
Payment term:
T/T
Delivery time:
7 days
Technical Parameters:
Product Designations:
RU42UUCC0P5
Old Designations:
RU42UUCC0P5
HS Code:
84825000.90
Structure:
Cylindrical
Number of Rows:
Single row
Inside Diameter:
20 mm
Outside Diameter:
70 mm
Thickness:
12 mm
Weight:
0.12KG KG
Dynamic load Capacity, Radial (Cr):
7.1
Static load Capacity, Radial (Cor):
5.83
Reference speed (Grease rpm):
3000
Limiting speed (Oil rpm):
4500
Demensions:
20*70*12mm
Brand:
MONTON
Radial Clearance Trade No.:
C0
Precision Rating:
P4
Vibration:
Z1V1
Load Direction:
Radial
Bearing Material:
Gcr15
Cage Type:
Nylon
Cage material:
Gcr15
Seals Type:
seals
Seal Material:
Rubber
Number of Balls:
30
Ball Material:
Gcr15
Number of Roller:
25
Roller Material:
Gcr15
Transport Package:
Carton box
Shipping Ways:
TNT DHL
Country of Origin:
Luoyang
Service:
Third party
Quality Control:
Self control
Feature:
cylindrical
Application:
harmonic drive
RU42UUCC0P5 20*70*12mm Slim Crossed Roller Bearing For Zero Backlash Harmonic Gear Actuator Cycloidal Robot

RU42UUCC0P5 20*70*12mm slim crossed roller bearing for Zero Backlash Harmonic Gear Actuator Cycloidal Robot 

 Diameter (mm) Identification number  Main dimensions Shoulder height Basic load rating(radial) Weight
ID OD B Oil hole rmin
d D β d1 ds Dh C/kN Co/kN kg
20 RU42 20 70 12 3.1 0.6 37 47 7.35 8.35 0.29

 

Structure and Features

With the Cross-Roller Ring, cylindrical rollers are arranged with each roller perpendicular to the adjacent roller, in a 90° V groove, separated from each other by a spacer retainer. This design allows just one bearing to receive loads in all directions including radial, axial and moment loads. Since the Cross-Roller Ring achieves high rigidity despite the minimum possible dimensions of the inner and outer rings, it is optimal for applications such as joints and swiveling units of industrial robots, swiveling tables of machining centers, rotary units of manipulators, precision rotary tables, medical equipment, measuring instruments and IC manufacturing machines.

 

High Rotation Accuracy

The spacer retainer fitting among cross-arrayed rollers prevents rollers from skewing and the rotational torque from increasing due to friction between rollers. Unlike conventional types using steel sheet retainers, the Cross-Roller Ring does not cause unilateral contact of roller or seize. Thus, even under a preload, the Cross-Roller Ring provides stable rotation.

Since the inner and outer rings are designed to be separable, the bearing clearance can be adjusted.

In addition, a preload can be applied. These features enable accurate rotation.

 

Easy Handling

The inner and outer rings, which are separable, are secured to the Cross-Roller Ring body after being installed with rollers and spacer retainers in order to prevent the rings from separating from each other. Thus, it is easy to handle the rings when installing the Cross-Roller Ring.

 

Skewing Prevention

The spacer retainer keeps rollers in their proper position, thereby preventing them from skewing(tilted rollers). This eliminates friction between rollers, and therefore secures a stable rotational torque.

 

Increased Rigidity (Three to Four Times Greater than the Conventional Type) Unlike the thin angular ball bearings installed in double rows, the cross array of rollers allows a single Cross-Roller Ring unit to receive loads in all directions, increasing the rigidity to three to four times greater than the conventional type.

 

Large Load Capacity

(1) Compared with conventional steel sheet retainers, the spacer retainer allows a longer effective

contact length of each roller, thus signifi cantly increasing the load capacity. The spacer retainer guides rollers by supporting them over the entire length of each roller, whereas the conventional type of retainer supports them only at a point at the center of each roller. Such one-point contact cannot suffi ciently prevent skewing.

 

(2) In conventional types, the loaded areas are asymmetrical between the outer ring and the inner ring sides around the roller longitudinal axis. The greater the applied load is, the greater the moment becomes, leading end-face contact to occur. This causes frictional resistance, which hinders smooth rotation and quickens wear.



Types of the Cross-Roller Ring


Types and Features

 

Model RU (Integrated Inner/Outer Ring Type) 

Since holes are drilled for mounting, the need for a presser fl ange and a housing is eliminated. Also, owing to the integrated inner/outer ring type stryucture with washer, there is almost no effect from installation on performance, allowing stable rotational accuracy and torque to be obtained. Can be used for both outer and inner ring rotation.

 

Model RB (Separable Outer Ring Type for Inner Ring Rotation)

Cross-Roller Ring basic type, with a separable outer ring, and an inner ring integrated with the main body.It is used in locations where the rotational accuracy of the inner ring is required. It is used, for example, in the swivel portions of index tables of machine tools.

 

Model RE (Two-piece Inner Ring Type for Outer Ring Rotation)

Main dimensions are the same as model RB. This model is used in locations where the rotational accuracy of the outer ring is required.

 

Model RA (Separable Outer Ring Type for Inner Ring Rotation)

A compact type similar to model RB with the thinnest possible inner and outer rings. Optimal for locations requiring a light-weight and compact design such as the swivel portions of robots and manipulators.

 

Selecting a Cross-Roller Ring

The following diagram shows a typical procedure for selecting a Cross-Roller Ring.


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