DBSC

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Features

・New coupling that incorporates tolerance endplay function like a universal joint.
・Inexpensive due to a simple construction-composed of three elements: an outer hub, an inner hub, and multiple balls.
・Sturdy structure that is capable of withstanding high-impact torques in extreme conditions.
・Left and right hole diameters range from ø6 to ø12, and can be freely selected in any combination.
・No splashing even at 3000 rpm, thanks to the use of special high-viscosity grease.
・Suitable for use in pumps, medical equipment, electric wheelchairs, agricultural equipment, transport equipment, construction equipment, and robots.
・The balls, which transmit torque, do not rotate; they only move back and forth slightly when there is angular misalignment.

 dbsc 01

Configuration and materials

 

dbsc zu en

dbsc hinban en

Assembly: 

Example Application

dbsc caution en

 1).Since eccentricity is not allowed in single unit, the shaft is supported on one side by the same coupling.
2).The outer hub and inner hub should be assembled in their correct relative positions, without detaching them from each other.
3).The relationship between abrasion and angular misalignment: the balls slip through the groove of the outer hub during each rotation.

 

Rotational life test

(Ex.1:Light load rotational life test)

Angular

misalignment 

 0° 5° 10° 15°
 Slip 0° 1.1mm 2.3mm 3.4mm 

Abrasion (backlash) is given by torque × slip × rpm.

 Conditions 1 )
Continuous rotation of 60million cycles at a load torque of 0.2Nm, angular misalignment 5°, and speed 2960 rpm.
Lubrication: special high-viscosity grease (our standard) was applied once before the test.
Test results: no decrease in strength, increase in backlash from 0.6°to 1.1°

Conditions 2 )
Continuous rotation of 60million cycles at a load torque 0.2Nm, angular misalignment 10°, and speed 2960 rpm.
Lubrication: special high-viscosity grease (our standard) was applied once before the test.
Test results: no decrease in strength, increase in backlash from 0.6°to 1.7°

Dimensions

Item No.

Standard hole diameters ød1,ød2 H8

(left/right can be freely conbined)

M 

Fastening
torque
(N⋅m)
DBSC 20     6     8     10     12     4 2.5

Specifications

Item No.

Rated torque

(N⋅m)

Static failure torque

(N⋅m)

Torsional rigidity
(N⋅m/rad)

Back lash

(deg. MAX)

Allowable

end play

Allowable angular

misalignment

(°)		Allowable rotating speed
(rpm)

Mass

(g)

DBSC20 6 34 750 ≦ 1.2

±2.5mm at

angular misalignment ≦5°

±1mm at

angular misalignment =15°

 15(MAX) 1,500 26

Note:Rated torque is for angular misalignment ≦ 5°. At a deflection of 15°, the rated torque will be approximately 1/3 these values.

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