DC 4127(3C) One-Way Clutches Bearings 27x75×13.5 mm

One-Way clutches  DC 4127(3C)

                                                                          
Demension:27×75×13.5 mm,    Weight: 90g.

SHAPE LOCATION TOLERANCE SHOULD BE TO CURRENT STANDARD;

Outer ring fordrawncup needle roller bearings(DC type) is made of cold rolled steel strip accurately 

formed.Structure of DC needle roller bearings features space saving and higher capacity.They are suitable 

for applications with limited space and housing not hard enough to act as raceway. No requirement on axial 

location when the DC needle roller bearing is pressed into the housing.

In most applications inner ring is not necessary for DC needle roller bearings unless shaft raceway is 

impractical,standard inner rings for DC to compare with open end DC needle roller bearings, close end DC 

needle roller bearings are good for sealing at the close end of bearings,operating temperature range for 

bearings grease lubricatedare 20℃ to +120℃.

One-Way clutches  DC 4127(3C)

1. The drawn cup needle roller clutch is the overriding clutch (one-way clutch), composed of the outer ring

punched with the high-quality steel sheet, plastic retainer, spring and needles, used for transferring one-

way torque.The drawn cup needle roller clutch has not the load carrying feature by itself. However it can

play the action in combination with Model HK and BK drawn cup needle roller bearing.The drawn cup needle 

roller clutch is the block bearing either withstanding the radial load or transferring torque.

2. Inspection the enveloping circle diameter

The dimensional accuracy of drawn cup needle roller bearings cannot be measured before fitting without a 

ring gauge as the thin-walled outer ring can be out of round due to the manufacturing process. The bearings

obtain the accuracy required for their correct function only when pressed into ahousing bore which must be

manufactured with the recommended tolerance limits.

The enveloping circle diameter can then be checked as follows:

a. Press the bearing into a steel ring gauge(wall thickness≥20mm).The bore dimension of the ring

 gauge must correspond to that given.

b. Measure the enveloping circle diameter with cylindrical go and no-go gauge plugs.

3. Type DC is a sprag type freewheel cage without inner or outer races. It must be installed in a design 

providing races, bearing support for axial and radial loads, lubrication and sealing. The DC type version-N

accepts all types of lubricants currently used in the power transmission equipement.
The sprag space tolerance must not be exceeded. Inner and outer races must both have a minimum plain

width "e", without any recess, to ensure the freewheel functions correctly as shown on following pages.

Alternatively, races can be made in case hardened steel shafts, or housings, to the specification below.

Surface hardness of the finished part should be HRC 60 to 62, for a depth of 0,6 mm minimum.

Core hardness to be HRC35 to 45. Surface roughness not to exceed 22CLA. Maximum taper between races:

0,007 mm for 25 mm width.

One-Way clutches  DC 4127(3C)