MBDB

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Features

・New coupling that incorporates tolerance endplay function like a universal joint.
・Simple construction-composed of three elements : an outer hub, an inner hub(Stainless steel), and multiple balls.
・No splashing even at high speed, thanks to the use of special high-viscosity grease.
・Compact, with high-strength, making it suitable for miniaturization of mechanisms.

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Configuration and materials

 

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Assembly: 

Example Application

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Assembly Example 1

Shaft has same diameter as hub screw.
Thread the end of the shaft and fix it using the locknut.

 

 

 

Assembly Example 2

Shaft is thicker than the hub screw diameter.
Thread the end of the shaft and fix it using a screw-in plug.

 

Note:

・Fix the shaft-coupling component using a strong adhesive, such as “Loctite”.
・Strong high-viscosity grease is applied to the ball joint.
・Since the inner hub is free in the axial direction during rotation, it has left-light movement.

Dimensions

Item
No.		D LBCEF

W

Spanner

groove

M 

Fastening
torque
(N⋅m)
MBDB4
 4 19.8 5 2.7 6.5 1.5 3.2 2 0.2
MBDB5
 5 24.5 6.2 3.5 8 2 4 3 0.6
MBDB6 6 27.6 6.8 4 9 2.5 5 3.5 1.2
MBDB7 7 31 8 4.5 10.5 2.5 6 4

2.5

Specifications

Item No.

Roted torque

(N⋅m)

Maximum rotating speed

(rpm)

Torsional rigidity
(N⋅m/rad)

Back lash

(deg. MAX)

Allowable angular misalignment

(°)

Allowable 

parallel misalignment

(mm)

Allowable end play

(mm)

Moment of inertia
(kg⋅m2)

Mass

(g)

MBDB4 0.1 2,000 6 2.5 25 3 ±1.5 2.0x10-9 1
MBDB5 0.25 2,000 12 2.5 25 4 ±1.8 6.3x10-9 2
MBDB6 0.4 2,000 20 2 25 5 ±2.0 2.0x10-8 4
MBDB7 0.6 3,000 33 2 25 6 ±2.4 4.0x10-8 6

*1. Rated torque is for angular misalignment≦10°. At 17°, it will be approx.1/2 the value; at 25°approx.1/3.
*2. Maximum rotating speed is for angular misalignment≦10°. At 17°, it will be approx.1/2 the value; at 25°approx.1/3.
*3. Allowable end play is for angular misalignment≦10°. At 17°, it will be approx.1/2 the value; at 25°approx.1/3.

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