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 Linear Ball Bushing


 Flanged Type Linear Ball Bushing
Super  Linear Ball Bushing
 
  LMES
  LMES-OP
  LMBS
  LMBS-OP


 Linear Ball Bushing System Case Unit


 Linear Ball Bushing System Support Rail Unit


 Linear Ball Bushing System Shaft Support


 Linear Ball Bushing System LM shaft
   Linear Ball Bushing
   C
ontrast Table
 
    ARIS offers Super Linear Ball Bushing as a new standard in linear motion bearings. This Super Linear Ball Bushing has 3 times load rating and 27 times travel life of conventional linear bushings. Also, ARIS Super Linear Ball Bushing offers Alignment which can give you less installation time and can prolong the travel life by reducing the friction between the shaft and balls. Super Linear Ball Bushing is designed to meet any customer's demands such as factory automation equipments, industrial machines, electrical equipments, measuring instruments, and etc. ARIS Super Linear Ball Bushing will give you the benefit of total cost reduction and improvement of your machine performance.
 
 Super Linear Ball Bushing Features
Higher Load Ratings  
    Uniquely designed ball plate is made by hardened steel, and the precisely ground groove is slightly larger than ball size which provides greater contact area between the ball and the ball plate. And, this design provides 3 times higher load ratings of the conventional linear bushing.

Self  Alignment
    Ball plate has a convex shape to provide a pivot point at the center which allows self alignment up to 0.5°. This self alignment capability eliminates any possibility of edge pressure caused by inaccurate machining, errors on mounting, or shaft deflection.

Longer Travel Life
    ARIS Super Linear Ball Bushing offer three times the load rating or 27 times travel life of conventional linear bushing.

Smooth And Silent Motion
    Super Linear Ball Bushing has extremely smooth motion due to the uniquely designed ball retainer and the outer sleeve. They are made of engineering polymer, which has light weight, low friction, and high wear-resistance. Due to them, smooth and silent motion can be obtained.

Clearance Adjustment
    Super Linear Ball Bushing's ball plates are designed to float in the outer sleeve. This allows the clearance between the balls and shaft to be adjusted for the best application environment by using with the Clearance Adjustable housing.

Interchangeability
    Super Linear Ball Bushing is designed to be fully Interchangeable with conventional linear bushing.

 Cost Effectiveness
Lower Cost
    Self alignment feature can compensate the inaccurate machining of the base. so less installation time and lower cost can be obtained.

Higher Load Rating And Longer Travel Life
    Compared to the same size conventional linear bushing, Super Linear Ball Bushing offers higher load rating and longer travel life.

Reduction of Material Cost
   Super Linear Ball Bushing's higher load rating enables the use of smaller components, and reducing material cost.

Energy Saving
    Super Linear Ball Bushing is designed to be light weight, lower inertia, and low friction, So it enables the moving parts to have rapid motion with lower driving power.

Super Linear Ball Bushing
 
Standard type (not Sealed)
    Floating ball plate features offer self alignment and clearance adjustment, and light weight retainer and outer sleeve offers silent operation.
 
Open Type
    One ball circuit is removed from the outer sleeve to be used with bottom supported shaft for deflection free movement. This open type Super Linear Ball Bushing also has self alignment and clearance adjustment.
 
Standard type (Sealed)
    Specially designed integral wiper seals create a free floating action in the outer sleeve. It provides perfect sealing ability during self aligning operation.
   
 Part Number Notation
Suoer Linear Ball Bushing's part number notation is as follows:

 Load Ratings and Travel Life
     Super Linear Ball Bushing's load ratings give an influence to travel life with load direction, ball circuit orientation, and hardness of the shaft.

Basic Dynamic Load Rating (C) and Travel life
    The travel life of a Super Linear Ball Bushing is determined largely by the quality of the shaft. The basic dynamic load rating is maximum continuous load that can be applied to the Super Linear Ball Bushing with 90% of reliability achieving after 50km operation under normal conditions. The nominal travel life can be calculated by following equation.
 

  Practically, other factors will affect life as follows:
 

  From the above equations, when the stroke and frequency are constant, the travel life can be calculated by following equation:
 

Calculation example:
    The Maximum applied load and the travel life are the most important factor for choosing a proper size of Super Linear Ball Bushing. Belows are the sample calculation of the expecting travel life and choosing a proper size of Super Linear Ball Bushing.
—— Working conditiond ——
 · Applied load:                                      250N(P)
 · Stroke :                                                0.250m(Ls)
 · Number of strokes per minute :     60(Nr)
 · Shaft hardness :                                HRC 60(hr=1.0)
 · Operating speed :
 
other factors (fc、ft)are considered as 1.0

Calculation of expected travel life:

    Assuming the basic dynamic load rating is based on travel life of 50km and all other factors are 1.0, you choose the Super Linear Ball Bushing size that you can expect travel life.
Let's try LMES20UU with the above working conditions.
 

Choosing a proper Super Linear Ball Bushing
   Let's assume out design travel life is 15,000 hours:
 
   So, the proper Super Linear Ball Bushing for above condition is LMES25UU which has 3,800N as the basic dynamic load rating.

 Housing and Shaft
    To optimize the performance of the ARIS Super Linear Ball Bushing, high precision shaft and housing are required.
Housing
   For Super Linear Ball Bushing's application, housing is required, and the tolerance of housing bore will affect the life and the accuracy of application. See Table 9 and Table 10.

Table 9 Recommended tolerance between shaft and housing (ISO Standard)
Part Number
Shaft
Housing
shaft Dia.
Tol.(h6
Housing Bore
Tol.(H7
d(mm)
μm
d(mm)
μm
LMES10
10
0   -9
19
+21 0
LMES12
12
0   -11
22
LMES16
16
26
LMES20
20
0   -13
32
+25 0
LMES25
25
40
LMES30
30
47
LMES40
40
0   -16
62
+30 0
LMES50
50
75
Table 10 Recommended toleranced between shaft and housing (Imperial Standard)               unit: inch
Part Number
Shaft
Housing
shaft Dia.
Tol.(g6)
Housing Bore
Tol.(h7)
LMBS4
.2500
-.0002 to -.0006
.5000
0 to +.0007
LMBS6
.3750
-.0002 to -.0006
.6250
0 to +.0007
LMBS8
.5000
-.0002 to -.0007
.8750
0 to +.0008
LMBS10
.6250
-.0002 to -.0007
1.1250
0 to +.0008
LMBS12
.7500
-.0003 to -.0008
1.2500
0 to +.0010
LMBS16
1.0000
-.0003 to -.0008
1.5625
0 to +.0010
LMBS20
1.2500
-.0004 to -.0010
2.0000
0 to +.0012
LMBS24
1.5000
-.0004 to -.0010
2.3750
0 to +.0012
LMBS32
2.0000
-.0004 to -.0012
3.0000
0 to +.0012

Shaft
    Because the balls in ARIS Super Linear Ball Bushing as rolling elements are running directly on the shaft surface, the hardness, surface finishing, and tolerance of shaft will largely affect the travelling performance of Super Linear Ball Bushing.

The shaft:
 1)Hardness
    The hardness must be HRC 58 to 64.
    The shaft hardness below HRC 58 will lead decreasing of travel life and permissible load.

2) Surface Finishing
   The Surface finishing must be 1.6S or better for the smooth operation.

3) Tolerance
   The correct tolerance of the shaft diameter is recommended as shown on Table 9 and Table 10.

4) Fitting
   Recommended fittings between Super Linear Ball Bushing and shaft are shown in Table 9 and Table 10.
   Please note when the housing bore tolerance is H7, there are tight fit at the both ends of outer sleeve of metric tripe.                                         
                                                                                                                                                                                                                                      



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