Продукция фирмы SBC Шарико-винтовые пары линейные направляющие

Шарико-винтовые передачи.

Шарико-винтовые передачи.
A ball screw achieves high efficiency even if driving torque is low because balls roll between the screw The ball screw is composed of a screw, a nut and balls, Screws are classified by processing and Ball
shaft and ball nut to obtain a lower coefficient of friction than a leadscrew. Nuts are classified by recirculation method.
Low Coefficient of Friction and High efficiency
High Velocity and Acceleration.
Long Service Life Time.
-1. Types by Manufacturing Method
There are types, Rolled and Ground Screw Threads.
A rolled screw is manufactured by roll forming a thread form into a rod. A Ground screw is
manufactured by grinding the thread form into a rod. Generally ground screws are much more precise
and smooth.
-2. Circular-arc groove and ball contact structures
Four-point and Two-point Contact Structure
(Contact between ball and Circular-arc Groove)
(Load Angle) (Load Angle)
[Calculating the Lead Angle]
: Lead angle
L : Lead
dp : Ball circle diameter
1-3. Structure of the Screw Shaft The nut is classified by Recirculation method.
[Return Tube Type]
The most common type.
A return plate allows balls to recirculate.
[Deflector Type]
[Screw Diameter : d] [Lead : L]
Compact type, Easy to install
It means screw shaft outer diameter. The amount of linear movement achieved by 1
revolution of screw movement.
[Ball Diameter : Dw] [screw-shaft thread minor diameter : dr]
Ball diameter. The diameter of the screw measured from the
bottom of the thread form.
[Ball center-to-center diameter : dp]
[End-cap Type]
The screw diameter measured from the center of
balls rolling in the thread form. This number is These nut are suitable for long-lead type.
necessary to calculate maximum permissible Balls are recirculating in an end-cap.
speed and lifetime.
[Inner-recirculation Type]
Similar to End-cap type.
There is a passage of balls circulating inside of the nut and return piece allows balls to circulate. It is
suitable for high-speed.
[Ball Screw Requirements] References
Orientation : Horizontal / Vertical
Payload mass : m (kg) ) Acceleration
Linear Bearing Type : Rolling / Sliding
Frictional coefficient of the Linear Bearing :
Linear Bearing Resistance : f (N) ) Acceleration distance
External load in the axial direction : F (N)
Support method of the screw shaft : fixed-free / fixed-supported / fixed-fixed
Desired service life time : Lh (h) ) Even speed distance
Stroke length : Ls (mm)
Operating Speed : Vmax (m/s)
Acceleration time : t1 (sec) ) Deceleration distance
Constant velocity time : t2 (sec)
Deceleration time : t3 (sec)
Dwell time : td (sec)
Acceleration : a (m/s2)
Acceleration distance : L1 (mm)
Constant velocity distance : L2 (mm)
Deceleration distance : L3 (mm)
Number of revolutions per minute : n (min-1)
Positioning accuracy : - (mm)
Positioning repeatability : - (mm)
Backlash : - (mm)
[Motor Requirements]
Motor Type : AC servomotor / stepping motor, etc.
The rated speed of the motor : - (min-1)
Moment of Inertia of the motor : Jm (kg.m2)
Motor resolution : - (pulse / rev)
Reduction ratio : A