MBDC/NBDC

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Features

・Strong to large shock torque and rovibrational motion, the models for servo systems are free from a halt, offering secure operation.
・Capable of absorbing shaft misalignments (parallel and angular misalignments and end play) with a minimum loss of torque.
・High performance ensured even in servo systems with less mechanical precision.
・Compact, superior torque capacity and high durability contribute to downsizing of mechanisms.

 mbdc 01

Configuration and materials

 

mbdc zu en

mbdc hinban en・Key groove shape complies with new JIS standards.

Dimensions of key groove shape

mbdc key en
Hole diameter
d1,d2		KbtNominal dimension of keys
bxh
Basic dimen
sion		Tole
rance		Basic dimen
sion		Tole
rance
6-8 2 2 ±0.0125 1.0 +0.1
0		 2x2
8-10 3 3 1.4 3x3
10-12 4 4 ±0.0150 1.8 4×4
12-17 5 5 2.3 5×5
17-20 6 6 2.8 6×6

Dimensions

Item
No.		D 

Standard hole diameters ød1,ød2 H8

(left/right can be freely conbined)

LBCFG

M 

Fastening
torque
(N⋅m)
MBDC28
 28   6   8   10   12                 39.6 19.2 7.8 4 1.2 #6-32 *1 3
MBDC32
 32       8   10   12   14             46 22.2 9.5 4.5 1.6 4 4.5
NBDC40 39.5               12   14   18   20     56 27.2 14.3 6 1.6 4 4.5

*1.Use hexagon socket head bolt complying with the inch-screw standard and 7/64 L-wrench.

Specifications

Item No.

Allowable 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)

MBDC28 30 3,000 6,000 0.1 3 0.2 ±0.5 2.0x10-5 160
MBDC32 45 3,000 7,500 0.1 3 0.2 ±0.5 4.0x10-5 210
NBDC40 50 3,000 8,000 0.1 3 0.3 ±0.5 4.0x10-5 180

*1. Rated torque is for parallel misalignment≦0.1. At 0.2, it will be 1/2 the value.
*2. Maximum rotating speed is for parallel misalignment≦0.1. At 0.2, it will be 1/2 the value.
*3. Up to 5°angular misalignment is absorbed on the conditions of 1/3 or less the values of maximum rotating speed and 1/2 or less the values of rated torque.
*4. Up to 0.4 parallel misalignment is absorbed on the conditions of 1/3 or less the values of maximum rotating speed and 1/2 or less the values of rated torque.

*5. As a high torque model with less shaft-combining force, key groove processing is basically required.

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